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100 AÑOS DE BRIOZOOLOGIA ANTARTICA: DESDE LA EXPEDICION ANTARTICA BELGA, 1904, HASTA LA 13ª CONFERENCIA INTERNACIONAL DE BRIOZOOLOIA, CONCEPCIÓN, CHILE 2004
Provedor de dados: 72
Autores: Moyano,Hugo I.
Se describe la historia de los descubrimientos briozoológicos hechos en la Antártica durante el siglo que va entre la publicación de los resultados de la Expedición Antártica Belga (1904) y la realización de la 13ª conferencia de la International Bryozoology Association habida en Concepción, Chile, en enero de 2004 (Moyano et al. 2003). Los países participantes en los descubrimientos incluyen a Bélgica, Francia, Alemania, Australia, Suecia, Rusia, UK, USA, Nueva Zelanda, España, China, Italia, Argentina y Chile lo que se ha traducido en la descripción de 6 familias nuevas 41 géneros nuevos y no menos de 315 especies nuevas. Sin embargo, como algunas de las especies nuevas son subantárticas, y otras tanto antárticas como subantárticas el número real de...
Tipo: Journal article
Palavras-chave: Historia de la ciencia; Antártica; Bryozoa.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100014

116 años de la Revista Chilena de Historia Natural: Breve relato de dos antes y un después
Provedor de dados: 97
Autores: CAMUS,PATRICIO A.
El año 2013 marcará el cierre de una etapa importante para la Revista Chilena de Historia Natural (RCHN), ya que a partir de 2014 comenzará a publicarse a través de la plataforma SpringerOpen, incluyendo algunos cambios relevantes en su diseño, manejo editorial, e idioma, entre otros. Por lo tanto en este artículo sintetizo algunos aspectos clave en la evolución de RCHN desde su fundación a fines del siglo 19, a través de dos períodos históricos: (a) 1897-1963, donde destaca la figura de su creador Carlos E. Porter y el rol de la Sociedad Chilena de Historia Natural, y (b) 1983-2013, su etapa reciente ligada a la Sociedad de Biología de Chile. Adicionalmente presento un breve análisis de la situación y el impacto de RCHN en su etapa moderna, incluyendo...
Tipo: Journal article
Palavras-chave: Chile; Historia natural; Impacto.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400001

13C Photoassimilate partitioning in sweet cherry (Prunus avium) during early spring
Provedor de dados: 118
Autores: Ayala,Marlene; Lang,Gregory A.
Stored reserves are critical for the early spring growth of reproductive and vegetative sinks in sweet cherry (Prunus avium L.). To study the distribution of carbon storage reserves on new, highly productive hybrid rootstocks in sweet cherry, an experiment was established using 5-yr-old cv. 'Regina' on the semi-vigorous rootstock 'Gisela®6' ('GI®6'). Using whole-canopy enclosure chambers, five trees were pulse-labeled three times with high levels of 13CO2 during the fall. At leaf drop, leaves, buds, wood, bark and roots were sampled for gas chromatography-mass spectrometry (GC-MS) analysis. The storage organs with the highest percentages of excess 13C atoms were the roots and the older wood in the trunks, branches and buds. During the spring, newly...
Tipo: Journal article
Palavras-chave: Fruit set; 'Gisela®' rootstock; Sink; Spring remobilization stage I; Storage reserves; Transition.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000200006

1,3-Propanediol production from crude glycerol by Clostridium butyricum DSP1 in repeated batch
Provedor de dados: 69
Autores: Szymanowska-Powalowska,Daria.
Background The production of biofuels from renewable energy sources is one of the most important issues in industrial biotechnology today. The process is known to generate various by-products, for example crude glycerol, which is obtained in the making of biodiesel from rapeseed oil. Crude glycerol may be utilized in many ways, including microbial conversion to 1,3-propanediol (1,3-PD), a raw material for the synthesis of polyesters and polyurethanes. Results The paper presents results of a study on the synthesis of 1,3-propanediol from crude glycerol by a repeated batch method with the use of Clostridium butyricum DSP1. Three cycles of fermentation medium replacement were carried out. The final concentration of 1,3-PD was 62 g/L and the maximum...
Tipo: Journal article
Palavras-chave: Environmental stress; Fermentation; High-performance liquid chromatography.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600011

16S rRNA gene-based molecular analysis of mat-forming and accompanying bacteria covering organically-enriched marine sediments underlying a salmon farm in Southern Chile (Calbuco Island)
Provedor de dados: 72
Autores: Aranda,Carlos; Paredes,Javier; Valenzuela,Cristian; Lam,Phyllis; Guillou,Laure.
The mat forming bacteria covering organic matter-enriched and anoxic marine sediments underlying a salmon farm in Southern Chile, were examined using 16S rRNA gene phylogenies. This mat was absent in the sea bed outside the direct influence of the farm (360 m outside fish cages). Based on nearly complete 16S rRNA gene sequences (-1500 bp), mat-forming filamentous cells were settled as the sulphur-oxidizing and putatively dissimilative nitrate-reducing Beggiatoa spp., being closely related (up to 97% sequence identity) to Beggiatoa spp. identified in eutrophic shallow sediments in northern Europe (Danish Limfjorden and German Dangast inlets). Their phylogenetic affiliation was consistent with their morphology as vacuolated and sulphur-containing cells...
Tipo: Journal article
Palavras-chave: 16S rRNA genes; Beggiatoa mat; Salmon farming sediments; Sulphur cycle.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200006

1a,25(OH)2D3 induces capacitative calcium entry involving a trpc3 protein in skeletal muscle and osteoblastic cells
Provedor de dados: 48
Autores: SANTILLÁN,G; KATZ,S; BUITRAGO,C; BOLAND,R.
This work describes the involvement of TRPC proteins in capacitative calcium entry (CCE) induced by 1a,25-dihydroxy-vitamin-D3 [1a,25(OH)2D3] in chick skeletal muscle and in rat osteoblast-like cells (ROS 17/2.8) and the role of the vitamin D receptor (VDR) in this non-genomic rapid response mediated by the hormone. We propose that an endogenous TRPC3 protein mediates 1a,25(OH)2D3 modulation of CCE in these cells, which seems to implicate VDR-TRPC3 association and the participation of an INAD-like scaffold protein.
Tipo: Journal article
Palavras-chave: CCE TRPC muscle cells osteoblasts 1a; 25(OH)2D3 VDR INAD.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400021

20 AÑOS DE FONDECYT
Provedor de dados: 48
Autores: PHILIPPI,BRUNO.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000100003

20th century fluctuations in the abundance of siliceous microorganisms preserved in the sediments of the Puyuhuapi Channel (44° S), Chile
Provedor de dados: 97
Autores: REBOLLEDO,LORENA; LANGE,CARINA B.; FIGUEROA,DANTE; PANTOJA,SILVIO; MUÑOZ,PRÁXEDES; CASTRO,RODRIGO.
We present a 100-year reconstruction of siliceous export production from sediments of the Puyuhuapi Channel (44° S, 70° W) in the Chilean fjords. We use accumulation rates and concentrations of diatoms and silicoflagellates, organic carbon (Corg) and biogenic opal (SiOPAL) as proxies of export production, and fluctuations in the contribution of freshwater diatoms as proxies of rainfall in the hinterland and river runoff. Box core sediments collected at two sites within the Puyuhuapi Channel were analyzed: Station 35 (at the head of the fjord; 56 m water depth) and Station 40 (in the middle of the Channel; 270 m water depth). Surface sedimentation rates were 0.75 cm yr-1 at Station 35 and 0.25 cm yr-1 at Station 40. SiOPAL content averaged ~ 4 % at both...
Tipo: Journal article
Palavras-chave: Siliceous microorganisms; Diatoms; Sediments; Export production; Puyuhuapi Channel; Chilean fjords.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000300009

3-D modeling and molecular dynamics simulation of interleukin-22 from the So-iny mullet, Liza haematocheila
Provedor de dados: 69
Autores: Qi,Zhitao; Shi,Rongwei; Li,Suyang; Zang,Xiayan; Wang,Zisheng.
Background: Interleukin-22 (IL-22) plays an important role in the regulation of immune responses. However, little is known about its function or structure in fish. Results: The IL-22 gene was first cloned from So-iny mullet (Liza haematocheila), one of commercially important fish species in China. Then, 3-D structure model of the mullet IL-22 was constructed by comparative modeling method using human IL-22 (1M4R) as template, and a 5 ns molecular dynamics (MD) was studied. The open reading frame (ORF) of mullet IL-22 cDNA was 555 bp, encoding 184 amino acids. The mullet IL-22 shared higher identities with the other fish IL-22 homologs and possessed a conserved IL-10 signature motif at its C-terminal. The mullet IL-22 model possessed six conserved helix...
Tipo: Journal article
Palavras-chave: Comparative modeling; Interleukin-22; Liza haematocheila; Molecular dynamics.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400003

3D Print of the Maxillary Sinus for Morphological Study
Provedor de dados: 77
Autores: Araneda,Nadia; Parra,Marcelo; Valdivia Osorio,José; Olate,Sergio.
The maxillary sinus (MS) is described as a pyramid-shaped cavity of the maxilla. Knowledge of its morphology makes it possible to define normality and abnormality so that its three-dimensional analysis can be a valuable preoperative tool during surgery in this anatomical area. The aim of this study is to present a strategy of morphological analysis of the MS using 3D printing acquired through computed cone beam tomography (CBCT) images. A cross-sectional descriptive study was conducted, including 15 subjects (8 women and 7 men). The 3D virtual reconstruction and modeling was done on the MSs bilaterally, and 30 physical models were produced on a 3D printer. The results revealed that the MSs obtained exhibited various morphologies. An individual analysis of...
Tipo: Journal article
Palavras-chave: Maxillary sinus; 3D printing; Biomodel.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300046

3-D Structural Changes in Subchondral Bone and the Effect of Bisphosphonate Intervention in Early Osteoarthritis
Provedor de dados: 77
Autores: Chen,Hainan; Dong,Qirong; Jiang,Wei.
This study aims to observe the 3-D structural changes in subchondral bone and the effects of bisphosphonate intervention in the early unsteady stage of the knee joint. Sixty healthy male New Zealand white rabbits were divided into the model group (n= 24), the bisphosphonate (Bis) group (n= 24), and the control group (n= 12). The rabbits' right knees were used to evaluate the structural changes. The Bis group received subcutaneous injections of bisphosphonate, while the model and control groups received subcutaneous injections of isotonic saline solution. After surgical preparation, the knee joint was dissected for Micro-CT examination, and the Micro-CT results were compared using ANOVA. In the fourth postoperative week, the bone volume fraction (BVF),...
Tipo: Journal article
Palavras-chave: Osteoarthritis; Subchondral bone; 3D structure; Micro-CT.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100042

4NQO Carcinogenesis: A Model of Oral Squamous Cell Carcinoma
Provedor de dados: 77
Autores: Rivera Martínez,César Andrés.
The experimental oral carcinogenesis induced by the chemical 4-nitroquinoline 1-oxide (4NQO) is one of the most frequent in the study of squamous cell carcinoma of the oral cavity (CCEC). The clear advantage is that the model is very similar to the physiological process of malignancy. The model has clear benefits by and is suitable for applications in therapeutic research.
Tipo: Journal article
Palavras-chave: 4NQO; Experimental carcinogenesis; Oral squamous cell carcinoma; Tongue.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100055

50 years of amino acid hydrophobicity scales: revisiting the capacity for peptide classification
Provedor de dados: 48
Autores: Simm,Stefan; Einloft,Jens; Mirus,Oliver; Schleiff,Enrico.
BACKGROUND: Physicochemical properties are frequently analyzed to characterize protein-sequences of known and unknown function. Especially the hydrophobicity of amino acids is often used for structural prediction or for the detection of membrane associated or embedded &amp;#946;-sheets and &amp;#945;-helices. For this purpose many scales classifying amino acids according to their physicochemical properties have been defined over the past decades. In parallel, several hydrophobicity parameters have been defined for calculation of peptide properties. We analyzed the performance of separating sequence pools using 98 hydrophobicity scales and five different hydrophobicity parameters, namely the overall hydrophobicity, the hydrophobic moment for detection of...
Tipo: Journal article
Palavras-chave: Hydrophobicity scale; Transmembrane sheets; Transmembrane helix; Beta-sheet; Amino acid pattern; Alternate hydrophobicity.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100031

A 4-component sex pheromone of the Chilean fruit leaf roller Proeulia auraria (Lepidoptera: Tortricidae)
Provedor de dados: 118
Autores: Reyes-Garcia,Luis; Cuevas,Yuri; Ballesteros,Carolina; Curkovic,Tomislav; Löfstedt,Christer; Bergmann,Jan.
L. Reyes-Garcia, Y. Cuevas, C. Ballesteros, T. Curkovic, C. Löfstedt, and J. Bergmann. 2014. A 4-component sex pheromone of the Chilean fruit leaf roller Proeulia auraria (Lepidoptera: Tortricidae). Cien. Inv. Agr. 41(2):187-196. The Chilean fruit leaf roller Proeulia auraria is a pest of economically important fruit species. Two compounds attractive to males have been identified as (E)-11-tetradecenyl acetate (E11-14:OAc) and (E)-11-tetradecenol (E11-14:OH) and are currently being used in Chile to monitor this species. Preliminary experiments carried out by our group suggested that the 2-compound mixture might not be optimal for the attraction of males, which prompted us to reinvestigate the sex pheromone of P. auraria in the present study. The pheromone...
Tipo: Journal article
Palavras-chave: Eulia; Euliini; Native species; Sex attractant; Tortricinae.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000200005

A Biceps Muscle Latissimus dorsi in a Dog
Provedor de dados: 77
Autores: Gil,Julio; Olivares,Ricardo.
This article reports the finding of a twin unreported muscle begin. In one dog, both, left and right muscle latissimus dorsi were biceps. The thin second head of m. latissimus dorsi that we founded, could be an intermediate step of comparative anatomy changes from reptilian to mammal. Man breast surgery and cardiomyoplasty, use dog latissimus dorsi as experimental, to know this information can be useful to these situations.
Tipo: Journal article
Palavras-chave: Muscle; M. Latissimus dorsi; Dog; M. Biceps; Arm.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400053

A Brief Review on the History, Methods and Applications of Plastination
Provedor de dados: 77
Autores: Pashaei,Shahyar.
Plastination is a process of preservation of anatomical specimens by a delicate method of forced impregnation with curable polymers like silicone, epoxy or polyester resins with vast applications in medical fields of study. Plastination is a technique of tissue preservation developed by Dr. Gunther von Hagens in 1977. In this process, water and lipids in biological tissues are replaced by curable polymers (silicone, epoxy, polyester) which are hardened, resulting in dry, odorless and durable specimens. In this technique it is possible for us to treat every part of the body and tissues to preserve it for educational purposes. Nowadays there are new and vast varieties of applications for plastination in the educational and cultural areas. This invention has...
Tipo: Journal article
Palavras-chave: Plastination; Impregnation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400014

A C1069G SNP of the MC4R gene and its association with economic traits in Korean native cattle (brown, brindle, and black)
Provedor de dados: 69
Autores: Lee,Youngsub; Park,Sairom; Kim,Hun; Lee,Seung Kyu; Kim,Jin Woo; Lee,Hak Kyo; Jeong,Dong Kee; Lee,Sung Jin.
Background: The melanocortin-4 receptor gene (MC4R) plays an important role in regulating food intake and body weight in mammals. In the present study, we identified the MC4R gene in native Korean brown, brindle, and black cattle by polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP), and investigated its association with economic traits. A total of 413 cattle from the three breeds were tested for backfat thickness, carcass weight, longissimus muscle area, and marbling score, and statistical data were analyzed using the SAS program. Results: The C allele had the highest frequency in brown and brindle cattle, and the G allele frequency was highest in black cattle. The C1069G SNP was significantly (p &lt; 0.05) associated with only...
Tipo: Journal article
Palavras-chave: Economic trait; Marbling scores; MC4R gene; PCR-RFLP; SNP.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500014

A Case of Anomalous Horizontal Fissure and Hypoplastic Middle Lobe of the Right Lung
Provedor de dados: 77
Autores: Okamoto,Keishi; Wakebe,Tetsuaki; Saiki,Kazunobu; Manabe,Yoshitaka; Tsurumoto,Toshiyuki.
During dissection practice for medical students at Nagasaki University, a horizontal fissure and hypoplastic middle lobe were encountered in the right lung of an 81-year-old Japanese female. In a normal right lung, the horizontal fissure is situated anterior to the oblique fissure. On the contrary, in the present case, the horizontal fissure was situated posterior to the oblique fissure. We identified a small, additional lobe on the medial surface of this lung. It was situated in the medial part of the oblique fissure, and was determined to be a small hypoplastic middle lobe. As a result of the hypoplasia of the middle lobe, the original horizontal fissure may have disappeared from the anterior surface. The horizontal fissure, in this case, may be a...
Tipo: Journal article
Palavras-chave: Lung; Horizontal fissure of right lung; Hypoplastic middle lobe; Oblique fissure; Anomaly.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200043

A Case of Unilateral Fenestration and Duplication of the External Jugular Vein
Provedor de dados: 77
Autores: Snoj,Ziga; Cvetko,Erika.
The external jugular vein is increasingly being utilized as the recipient vein in head and neck free tissue transfers, and for cannulation in order to conduct diagnostic procedures or intravenous therapies. The variations in the patterns of its course, and knowledge of them, are therefore important. We report on a unique and previously non-described unilateral fenestration and duplication of the external jugular vein found during the neck dissection of a 77-year-old female cadaver. Embryological evaluation and clinical implications of the anomaly are described. Clinicians and surgeons performing neck vascular or reconstructive surgery should be aware of this variation of the external jugular vein in the hope of preventing inadvertent injury.
Tipo: Journal article
Palavras-chave: External jugular vein; Anatomical variation; Fenestration; Duplication.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100016

A Case of Unusual Anatomy: Maxillary Central Incisor with Two Root Canals
Provedor de dados: 77
Autores: Rodrigues,Evaldo Almeida; Silva,Sílvio José Albergaria da.
Success in root canal treatment is achieved after thorough cleaning and shaping followed by complete obturation of the canal system. Therefore, endodontic therapy requires specific and complete knowledge of the internal and external dental anatomy, and its variations in presentation. Such treatment may be performed in root canal systems that do not comply with the normal anatomical features described in standard textbooks. The internal anatomy of the maxillary central incisor is well known and usually presents one root canal system. This case report describes an endodontic retreatment of a maxillary central incisor with two canal systems.
Tipo: Journal article
Palavras-chave: Central incisor; Two canals; Anatomy.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300030

A cell junction pathology of neural stem cells leads to abnormal neurogenesis and hydrocephalus
Provedor de dados: 48
Autores: Rodríguez,Esteban M; Guerra,María M; Vío,Karin; González,César; Ortloff,Alexander; Bátiz,Luis F; Rodríguez,Sara; Jara,María C; Muñoz,Rosa I; Ortega,Eduardo; Jaque,Jaime; Guerra,Francisco; Sival,Deborah A; Dunnen,Wilfred F. A. den; Jiménez,Antonio J; Domínguez-Pinos,María D; Pérez-Fígares,José M; McAllister,James P; Johanson,Conrad.
Most cells of the developing mammalian brain derive from the ventricular (VZ) and the subventricular (SVZ) zones. The VZ is formed by the multipotent radial glia/neural stem cells (NSCs) while the SVZ harbors the rapidly proliferative neural precursor cells (NPCs). Evidence from human and animal models indicates that the common history of hydrocephalus and brain maldevelopment starts early in embryonic life with disruption of the VZ and SVZ. We propose that a "cell junction pathology" involving adherent and gap junctions is a final common outcome of a wide range of gene mutations resulting in proteins abnormally expressed by the VZ cells undergoing disruption. Disruption of the VZ during fetal development implies the loss of NSCs whereas VZ disruption...
Tipo: Journal article
Palavras-chave: Hydrocephalus; Abnormal neurogenesis; Neural stem cells; Stem cell transplantation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000300005

A characterization of Chilean farmers based on their market-production orientation
Provedor de dados: 118
Autores: Echeverría,Rodrigo; Moreira,Víctor; Barrena,José; Gopinath,Munisamy.
Chile's open trade policy, implemented during the last few decades, has greatly transformed Chilean farmers and their production systems. As a result, farmers can be grouped into three categories based on their market-production orientation: domestic, transitional or export producers. The objective of this paper is to analyze the factors underlying the decision to produce for a particular market and compare the three groups of farmers based on data from the 2007 agricultural census. A generalized ordered logit model was used to analyze different methods of production, and non-parametric methods were used to compare the groups. Results show that some farmers change categories in sequence; farmers that produce for the domestic market can later produce for...
Tipo: Journal article
Palavras-chave: Agricultural trade; Export production; Generalized ordered logit model; Market.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200002

A Classic Case of Annular Pancreas and its Clinical Implications
Provedor de dados: 77
Autores: Nayak B,Satheesha; Mun Yooi,Ooi.
Annular pancreas is a rare developmental anomaly where the head of the pancreas surrounds the second part of the duodenum like a ring. This may cause the duodenal constriction, obstruction, peptic ulcers and other complications. We saw a classic case of annular pancreas. The head of pancreas surrounded the second part of duodenum completely. However there was no narrowing of the duodenum. The case may be of importance for gastroenterologists, surgeons and radiologists.
Tipo: Journal article
Palavras-chave: Pancreas; Annular pancreas; Duodenum; Anomaly.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200043

A Common 34C&gt;G Variant at the Peroxisome Proliferator-Activated Receptor &amp;#947;2- Gene in Chilean Women with Polycystic Ovary Syndrome and Controls
Provedor de dados: 77
Autores: Guzmán,Neftalí; Erices,Leonardo; Valdés,Patricio; Salazar,Luis A.
The 34C&gt;G (Prol2Ala) polymorphic variant of the peroxisome proliferator-activated receptor-&amp;#947;2 (PPAR-&amp;#947;2) gene has been associated with polycystic ovary syndrome (PCOS). However, the results between populations are contradictory. Thus, in the present study was investigated the possible association between 34C&gt;G polymorphism at the PPAR-&amp;#947;2 gene and PCOS in Chilean women. A total of 50 unrelated women (29.1 + 8.1 years) with diagnosis of PCOS and 75 healthy controls (29.3+ 9.3 years) were included in this study. Serum lipids, glucose and uric acid levels were determined by enzymatic-colorimetric methods. The 34C&gt;G variant in the PPAR-&amp;#947;2 gene was analyzed by PCR-RFLP. Women with PCOS exhibited a higher levels of...
Tipo: Journal article
Palavras-chave: Polycystic ovary syndrome; Peroxime proliferator-activated receptor; Prol2Ala polymorphism.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400030

A Communicating Branch between the Dorsal and Superficial Ramus of the Ulnar Nerve (Kaplan's Anastomosis): Clinical and Surgery Discussion
Provedor de dados: 77
Autores: Torre,F; Erthal,R; Fernandes,R. M. P; Babinski,M. A; Cisne,R.
The Kaplan´s anastomosis represents the communication between the dorsal and superficial branch of the ulnar nerve distal to ulnar canal. In the present study, a case about this nerve communication, found in a male adult cadaver, is reported. Information about brachial plexus distal anastomosis is fundamental for interpretation of clinical and electrophysiological findings, in order to establish the precise diagnosis of neurological lesions at this level. Its relations with flexor carpi ulnaris muscle's tendon and with pisiform bone exposes it to iatrogenic lesions during surgery.
Tipo: Journal article
Palavras-chave: Kaplan`s anastomosis; Ulnar nerve; Nerve lesion.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300010

A Comparative Analysis of Surface Areas and Ratio of the Cervical Spinal Cord and the Vertebral Canal at the Same Levels Via MRI on Healthy Individuals
Provedor de dados: 77
Autores: Duman,Fatma; Ziylan,Taner; Kiresi,Demet; Cicekcibasi,Aynur Emine; Büyükmumcu,Mustafa; Duman,Tolga.
The determination of the normal values of the cross-sectional surface areas and ratios of the vertebral canal and the spinal cord on the healthy individuals is of great importance with regards to the fact that it provides convenience for the doctors to make correct pathological diagnosis because of the most suitable treatment. In this study, it has been aimed to determine the respective ratios between the vertebral canal and the spinal cord via measuring their cross-sectional surface areas at the C3­C6 vertebra levels. The study has been implemented on the Magnetic Resonance Images (MRI) of the cervical vertebral column from healthy individuals at the Department of Radiology, Meram Faculty of Medicine, Necmettin Erbakan University. The study has been...
Tipo: Journal article
Palavras-chave: Cervical; Vertebral canal; Spinal cord; Area; Ratio.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400008

A Comparative Analysis of the Morphological Characteristics of Elite Karatekas, Judokas, Taekwondoists, Boxers and Wrestlers
Provedor de dados: 77
Autores: Malacko,Julijan; Doder,Dragan; Stankovic,Veroljub; Dokmanac,Milorad; Savic,Biljana; Doder,Radoslava.
The aim of this research was to use a system of 37 variables of morphological characteristics on a sample of 108 elite male athletes (25 karatekas, 27 judokas, 19 taekwondoists, 18 boxers and 19 wrestlers), aged 17 to 23, to determine any statistically significant differences between the groups of athletes in terms of variable means, so that during the training process, the selection of athletes could be carried out in a proper and objective manner and that the training transformation processes could be managed more effectively. After processing the data using the statistical method of a multivariate and univariate analysis of variance (MANOVA/ANOVA), we obtained results that indicate that among the karatekas, judokas, taekwondoists, boxers and wrestlers...
Tipo: Journal article
Palavras-chave: Males; Combat sports; Morphology; Comparison.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100038

A COMPARATIVE ANATOMICAL STUDY OF THE STEMS OF CLIMBING PLANTS FROM THE FOREST REMNANTS OF MARINGA, BRAZIL
Provedor de dados: 73
Autores: Lopes,Willian A. L.; Souza,Luiz A; Moscheta,Ismar M; Albiero,Adriana L. M; Mourão,Káthia S. M.
Climbing plants differ from self-supporting plants, such as shrubs and trees, in a range of characteristics, most notable are the mechanical properties of the stem. Liana stems as Pereskia aculeata Mill. (Cactaceae), Pisonia aculeata L. (Nyctaginaceae), Arrabidaea mutabilis Bureau et K.Schum. (Bignoniaceae), Dalechampia stipulacea Müll.Arg. (Euphorbiaceae) and Dicella nucifera Chodat (Malpighiaceae) were collected in Brazilian forest remnants. The objective of this paper is: a) to analyze the comparative stem structure of these species; b) to answer the inquiry whether these species present cambial variants or not and to verify the modes of cambial activities, and c) to contribute with the anatomical identification of the liana species, characterizing...
Tipo: Journal article
Palavras-chave: Anomalous growth; Climbing plants; Primary growth; Secondary growth; Cambial variant.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100005

A comparative cost analysis for using compost derived from anaerobic digestion as a peat substitute in a commercial plant nursery
Provedor de dados: 118
Autores: Restrepo,Adriana P; García García,José; Moral,Raúl; Vidal,Fernando; Pérez-Murcia,María D; Bustamante,María Á; Paredes,Concepción.
A.P. Restrepo, J. Garcia-Garcia, R. Moral, F. Vidal, M.D. Pérez-Murcia, M.A. Bustamante, and C. Paredes. 2013. A comparative cost analysis for using compost derived from anaerobic digestion as a peat substitute in a commercial plant nursery. Cien. Inv. Agr. 40(2): 253-264. The aim of this study was to evaluate the economic feasibility of using compost made from anaerobically digested cattle slurries in a commercial nursery. Using a comparative cost analysis, commercial peat substrate growing media has been partially substituted with increasing proportions of compost (25, 50 and 75% v/v of compost). This experiment was intended to establish the conditions under which the use of these composts is feasible and competitive relative to commercial peat, at both...
Tipo: Journal article
Palavras-chave: Anaerobic digestion; Costs; Economics; Growing media; Peat; Seedling production.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200002

A Comparative Histological Study of the Tongue of Rat (Rattus Norvegicus), Bat (Eidolon Helvum) and Pangolin (Manis Tricuspis)
Provedor de dados: 77
Autores: Abayomi,Taiwo A; Ofusori,David A; Ayoka,Oladele A; Odukoya,Samson A; Omotoso,Emmanuel O; Amegor,Frank O; Ajayi,Sunday A; Ojo,Gideon B; Oluwayinka,Oladele P.
This study assessed the micro anatomical differences in the tongue of rat, bat and pangolin with a view to establishing the functional anatomical differences of these mammalian tongues on their dietary pattern. Ten rats, ten bats and ten pangolins were used for this study. The animals were sacrificed and the tongue excised and processed for light microscopical study adopting the following stains: Haematoxylin Eosin, Verhoeff Gieson and Masson trichrome. The results showed non papillation of the keratinized stratified epithelium of pangolin tongue unlike the papillation seen in the tongue of the rat and bat. While the filiform papillation seen in the rat was bristle like, the filiform papillae in the bat were crown-like. There was also an unusual dense...
Tipo: Journal article
Palavras-chave: Rat; Bat; Pangolin; Tongue; Micro-anatomy.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400026

A Comparative Histomorphometric Study of the Stomach of Rat (Rattus norvegicus), Bat (Eidolon helvum) and Pangolin (Manis tricuspis) in Relation to Diet
Provedor de dados: 77
Autores: Ofusori,D. A; Caxton-Martins,E. A.
This study verified the comparative histomorphometric adaptations in the stomach of rat, bat and pangolin in relation to diet. Ten rats, ten bats and ten pangolins of both sexes were used for this investigation. The animals were sacrificed after slight anesthesia under chloroform inhalation. The stomach were excised, fixed in 10% formol saline and processed for light microscopic study. Stained slides were also subjected to morphometric analysis at a magnification of 400x. The results revealed that the cellular diameter/ density of parietal and zymogenic cells are significantly different in the three mammals (p&lt;0.05) with the exception of the diameter of the zymogenic cells in pangolin which was not statistically significant (p&gt;0.05) when compared...
Tipo: Journal article
Palavras-chave: Pangolin; Bat; Rat; Stomach; Histomorphometry; Connective tissue fibers.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300026

A comparative proteomic study of white and black glutinous rice leaves
Provedor de dados: 69
Autores: Phonsakhan,Wipada; Kong-Ngern,Kanlaya.
Background Black glutinous rice contains remarkable levels of anthocyanins, which possess anti-oxidative properties and thus have health benefits. The accumulation of anthocyanins in grains of thirty black glutinous rice varieties was measured, and the results revealed that the accumulated anthocyanin content ranged from 0.262 to 2.539 mg/g. Black glutinous rice Br no. 19 was selected, and its leaf protein expression profile was compared with that of white glutinous rice RD 6 using 2D-PAGE, and the protein spots were then directly analyzed after proteolysis by LC-MS/MS. Results The proteins from the leaves of the two rice varieties were separated using 2D-PAGE and silver stained, and the spots were analyzed using Image Master 2D Platinum version 5...
Tipo: Journal article
Palavras-chave: 2D-PAGE; Anthocyanin; LC-MS/MS; Oryza sativa L; Proteomics.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100006

A Comparative Study of Fixatives for Axolotl Blastema Tissue
Provedor de dados: 77
Autores: Keskin,Ilknur; Yildirim,Berna; Kolbasi,Bircan; Öztürk,Gürkan; Demircan,Turan.
Regeneration is defined as tissue renewal and functional restoration process of the damaged parts of the body after an injury. Ambystoma mexicanum, commonly named the Axolotl, is one of the unique vertebrates, which has a remarkable ability to regenerate their extremities following the amputation. Although the process of regeneration includes several periods, it can be divided into two main phases; blastema formation and dedifferentiation. In the couple of hours following the amputation, wound closure occurs by migration of epithelial cells around the amputation site followed by macrophage infiltration and dedifferentiation of cells to turn into stem cells. Accumulated stem cells form a very authentic tissue type called blastema, which is crucial for...
Tipo: Journal article
Palavras-chave: Axolotl; Blastema; Fixatives; Histology.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100009

A Comparative Study of the Ileum in Rat (Rattus norvegicus), Bat (Eidolon helvum) and Pangolin (Manis tricuspis) as Investigated Using Histological Method
Provedor de dados: 77
Autores: Ofusori,D. A; Caxton-Martins,E. A; Komolafe,O. O; Oluyemi,K. A; Adeeyo,O. A; Ajayi,S. A; Oluwayinka,P. O; Adelakun,E. A; Keji,S. T; Adesanya,O. A.
The histological and morphometric differences in some parts of the gastrointestinal tracts of rat, bat and pangolin have been well established. This investigation aims at comparatively elucidating any adaptational changes the ileum of the three mammals must have adopted to meet its dietary requirements and also cope with their morphological differences. The investigation was carried out using ten rats, ten bats and ten pangolins of both sexes. The animals were slightly anaesthetized under chloroform inhalation. The intestines were harvested and the ileum excised and fixed in 10% formol saline. The tissues were processed for light microscopic study. The following stains were employed: Haematoxylin and eosin (H &amp;amp; E), Van Gieson and Verhoeff's...
Tipo: Journal article
Palavras-chave: Pangolin; Bat; Rat; Ileum; Microanatomy; Conjuntive tissue.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100023

A Comparative Study of Variation of the Pterion of Human Skulls from 13th and 20th Century Anatolia
Provedor de dados: 77
Autores: Ilknur,Ari; Mustafa,Kafa Ilker; Sinan,Bakirci.
The pterion is a commonly used anthropologic and neurosurgical landmark defined as the junction of the sphenoid, temporal, parietal and frontal bones. It is commonly classified into four types based on sutural pattern: sphenoparietal, in which the sphenoid and parietal bones are in direct contact; frontotemporal, in which the frontal and temporal bones are in direct contact; stellate, in which all four bones come into contact at a point; and epipteric, in which a small sutural bone is found between the parietal bone and the greater wing of the sphenoid bone. In the present study, 44 Anatolian skulls from two different eras, Byzantine (13th century) and contemporary (20th century), were investigated for morphology and location of the pterion. Sphenoparietal...
Tipo: Journal article
Palavras-chave: Anatolian; Anthropology; Calvarial sutures; Epipteric bone; Morphometry.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400051

A Comparison of Anatomical Measurements of the Infraorbital Foramen of Skulls of the Modern and Late Byzantine Periods and the Golden Ratio
Provedor de dados: 77
Autores: Bakirci,S; Kafa,I. M; Coskun,I; Buyukuysal,M. C; Barut,C.
The aim of this study was to examine the morphometric characteristics of the infraorbital foramen of skulls of people living in modern society and in the late Byzantine period, to ascertain the symmetry or asymmetry of the two halves of the skulls by measuring the linear distance between various landmarks, to evaluate at the conformity between the infraorbital foramen and the golden ratio by calculating the ratios between these linear distances, and to set out the differences or similarities between the skulls of these different periods. It was found in the study that the morphometric characteristics of the infraorbital foramen in skulls of the modern period were 47.05 % circular, 41.17 % oval and 11.76 % atypical (semilunar and triangular) on the right,...
Tipo: Journal article
Palavras-chave: Infraorbital foramen; Golden ratio; Byzantine period; Asymmetry; Maxilla.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200057

A comparison of farmland value determinants in Chile between 1978-1998 and 1999-2008
Provedor de dados: 118
Autores: Donoso,Guillermo; Cancino,José; Olguín,Ricardo; Schonhaut,Daniela.
Research on the determinants that influence the price of farmland has found renewed interest in the past decade because agricultural land values are an important source of information for tracing the distribution of benefits generated by agricultural growth. This study's objective is to identify the determinants of the value of agricultural land in Chile for the periods 1978-1998 and 1999-2008 to analyze the evolution of the factors that determined the price of agricultural land between these two periods. The explanatory power of the estimated hedonic land price model is significantly greater for the period 1978-1998 (R²= 67%). The lower explanatory power of the model for the period 1999-2008 (R²= 29%) indicates that factors not accounted for in the model...
Tipo: Journal article
Palavras-chave: Agricultural land value; Determinants of agricultural land value; Hedonic agricultural land value model.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100007

A comparison of methods employed to evaluate antioxidant capabilities
Provedor de dados: 48
Autores: PEREZ,DRUSO D; LEIGHTON,FEDERICO; ASPEE,ALEXIS; ALIAGA,CAROLINA; LISSI,EDUARDO.
Thrce ditferent methodologies frequently employed to evaluate the indexes that report the antioxidant capabilities of pure compounds and/or complex mixtures of antioxidants are applied to a series of mono- and polyphenols, as well as to two wine (red and white) samples. These methodologies are based on the bleaching of a stable radical, the effect of the additive upon luminol chemiluminescence induced by peroxyl radicals, and the effect of the additive upon the bleaching of the fluorescence from a dye molecule. Widely ditferent responses are obtained from the different methodologies. These differences are interpreted in terms of the different factors (stoichiametric factors and/or reactivities) that determines the indexes evaluated by these different...
Tipo: Journal article
Palavras-chave: ABTS radical bleaching; Antioxidants; C-phycocyanin bleaching; Total antioxidant reactivity; Total reactive antioxidant potential.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200006

A COMPARISON OF OCEANIC CIRCULATION IN THE NORTH PACIFIC FORCED BY SCATEROMETER AND REANALYSIS WINDS
Provedor de dados: 72
Autores: Yuan,Xiaojun; Curchitser,Enrique.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300055

A Comparison of the Effect of Chlorhexidine, Tap Water and Normal Saline on Healing Wounds
Provedor de dados: 77
Autores: Salami,Ayodeji A; Imosemi,Innocent O; Owoeye,Olatunde O.
Many researchers have advocated in recent times that antiseptic use in healing wounds should be discouraged. Antiseptics have been found to retard healing of wounds. Innocuous solutions like normal saline and tap water are being considered as better alternatives to antiseptics. Chlorhexidine, a commonly used antiseptic, is known to be less toxic on granulation cells. We decided to compare the effect of chlorhexidine, normal saline and tap water on healing wounds. Three groups of wistar rats had 2 by 2cm full thickness wounds made on their right dorsolateral flanks. The wounds were dressed with either chlorhexidine, normal saline or tap water. Wounds were examined at three-day intervals and measurements of area covered were taken on the first day of study...
Tipo: Journal article
Palavras-chave: Chlorhexidine; Tap water; Nomal saline; Wound.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500025

A Comparison of the Relationship between the Golden Ratio and Anatomical Characteristics of the Supraorbital Foramen in Bare Skulls Belonging to the Byzantine Era and Modern Era
Provedor de dados: 77
Autores: Bakirci,S; Kafa,I. M; Coskun,I; Buyukuysal,M. C; Barut,C.
The aim of the present study is to determine the frequency of the occurrence of supraorbital foramen/notch (SOF/N) in the skulls of the people who lived in the modern era and the late Byzantine era, to determine the symmetry and the asymmetry between the two halves of the skulls by measuring the linear distance to various landmarks, to check the consistency between the location of the SOF/N and the golden ratio by calculating the ratio between linear distances and to evaluate the differences between the skulls from both historical periods. In the study, the frequency of the occurrence of the supraorbital notch in the skulls from the Byzantine era was found to be 26.60 % on the right and 13.30 % on the left while it was 14.30 % on the right and 9.52 % on...
Tipo: Journal article
Palavras-chave: Supraorbital foramen; Supraorbital notch; Golden ratio; Byzantine era; Asymmetry; Frontal bone.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200040

A Complex Variation of the Parietal and Visceral Branches of the Abdominal Aorta
Provedor de dados: 77
Autores: Unver Dogan,Nadire; Fazliogullari,Zeliha; Yilmaz,Mehmet Tugrul; Uysal,Ismihan Ilknur; Cicekcibasi,Aynur Emine; Ulusoy,Mahinur; Gunaslan,Pervin.
Variations in the branches of the abdominal aorta were determined during a routine abdominal region dissection of a 70-year-old male cadaver. Left gastric artery arose as the first root from antero-lateral of aorta. Coeliacomesenteric trunk occurred as a thick root. After 29.9mm, coeliacomesenteric trunk bifurcated as coeliac trunk and superior mesenteric artery. Coeliac trunk bifurcated as splenic artery and common hepatic artery. These multiple variations which change the normal anatomic structure of the abdominal aorta have to be kept in mind by surgeons, radiologists and anatomists.
Tipo: Journal article
Palavras-chave: Abdominal aorta; Coeliacomesenteric trunk; Anatomical variation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100015

A Computed Tomographic Study of Umbilical Anatomy: The Relationship between Umbilical Thickness and Diameter
Provedor de dados: 77
Autores: Kim,Maru; Oh,Seong-Taek.
Laparoscopic surgeries were first introduced in the 1980s. More recently, similar techniques such as natural orifice transluminal endoscopic surgery and other advanced transumbilical surgeries have been developed. With all of these surgical advances, basic information about the umbilicus is lacking. This study evaluated the relationship between umbilical diameter and thickness, as well as the underlying vessels, in order to develop a simple means of assessing umbilical anatomy. We retroactively reviewed 842 computed tomography images that included the umbilicus. Umbilical thickness, diameter, type of vessel located beneath the umbilicus, depth to the vessel, and other parameters were measured. Age and sex were noted, and their relationship was analyzed as...
Tipo: Journal article
Palavras-chave: Umbilicus; Anatomy; Laparoscopy.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300040

A critical assessment of the consciousness by synchrony hypothesis
Provedor de dados: 48
Autores: CANALES,ANDRÉS F; GÓMEZ,DAVID M; MAFFET,CLAUDIO R.
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000500012

A critical view to explanations for the maximal value of 50 % of genetic recombination
Provedor de dados: 97
Autores: VALENZUELA,CARLOS Y; PÉREZ-ALZOLA,PATRICIA; SANTOS,MANUEL J.
The maximal value of 50 % of genetic recombination (RF = recombination fraction) between two linked gene loci has been explained by two models: (i) the restriction of crossovers to only two of the four chromatids of a tetrad (tetrad model); (ii) the limit of the occurrence of an odd number of crossovers between two loci, when the expected number of crossovers tends to infinite (odd-even model). This article shows that (i) is wrong. If tetrads were responsible for the maximal 50 % RF, sister chromatid exchanges (SCE) should display a maximal 100 % RF. In mammalian CHO cells we found that SCE yield a maximal 50 % recombination. Also, we demonstrated that the maximal 50 % RF for tetrads occurs because the sum of odd order coefficients in the binomial...
Tipo: Journal article
Palavras-chave: 50 % recombination; Tetrads; Odd-even crossovers; SCE.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000015

A developmental approach to homology and brain evolution
Provedor de dados: 97
Autores: ABOITIZ,FRANCISCO.
Although homology is central to evolutionary interpretations, establishing it has become a highly disputed issue in some instances. Here I argüe for a developmental understanding of evolution, where modifications of the developmental programs are a key source of evolutionary novelty. Although this perspective is not new, in comparative neurobiology it has remained controversial. Specifically, the evolutionary origin of the mammalian neocortex has been a particularly debated point. I propose a perspective that could help reconcile a long standing controversy: either the mammalian neocortex corresponds as a whole to the dorsal hemisphere of reptiles and birds, or alternatively its lateral aspect corresponds to the lateral cerebral hemisphere and is partly...
Tipo: Journal article
Palavras-chave: Dorsal ventricular ridge; Neocortex; Pallium; Subventricular zone; Ventricular zone.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000400002

A dichotomous species of Codium (Bryopsidales, Chlorophyta) is colonizing northern Chile
Provedor de dados: 97
Autores: GONZÁLEZ,ALEJANDRA; SANTELICES,BERNABÉ.
In late 2001 and early 2002, a dichotomous species of Codium appeared colonizing the low intertidal and shallow subtidal bottoms of Caldera Bay, northern Chile (27° 03’ S, 70° 51’ W). Due to the ecological and economic impact the species is having in Caldera Bay and its potential spread along the Chilean coastline, we studied the taxonomic identity of the species and examined its relationships with other dichotomous species of Codium reported for temperate Pacific South America. Morphological analyses suggest that the seaweeds from Caldera Bay belong to Codium fragile (Suringar) Hariot. Not only is there strong agreement in internal and external morphological characters, but among all the species reported for Peru and Chile, this is the only one exhibiting...
Tipo: Journal article
Palavras-chave: Introduced species; Seaweed; Northern Chile.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000200008

A Different Origin of the Right Gastro-omental Artery
Provedor de dados: 77
Autores: Okamura,Aldo; Alvarez,Daniela; Genovez,Paula; Caldeira,Eduardo José; da Cunha,Marcelo Rodrigues; Carvalho,Cesar Alexandre Fabrega.
The gastro-omental artery is one of the branches of the common hepatic artery. Alterations in the embryonic development of the ventral splanchnic arteries can cause marked variations. A rare variant of the right gastro-omental artery was observed during dissection of a 50-year-old male cadaver. The occurrence of this variant has not been reported in the specialized literature. This case of a different origin of the gastro-omental artery is described in detail in order to provide information that may contribute to upper abdominal surgeries.
Tipo: Journal article
Palavras-chave: Right gastro-omental artery; Anatomical variations; Abdominal surgeries.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400025

A Direct Anatomical Study of the Morphology and Functionality of Disco-malleolar and Anterior Malleolar Ligaments
Provedor de dados: 77
Autores: Ramírez Aristeguieta,Luis Miguel; Ballesteros Acuña,Luis Ernesto; Sandoval Ortiz,German Pablo.
The disco-malleolar and anterior malleolar ligaments are common to the middle ear, the temporomandibular joint and the jaw, all of them sharing a common embryological origin; these ligaments' morphometric and functional aspects were studied in 23 temporal bones. Experimental design: The epitympanum roof and the temporomandibular joint roof were elevated by micro-dissection of the middle cranial fossa, exposing both disco-malleolar and anterior malleolar ligaments and their association with the malleus, the temporomandibular joint disc and the mandibular lingula. Principal observations: Both ligaments start in the malleus and take anterior and divergent routes towards the temporomandibular joint and lingula, passing through Huguier's canal. The...
Tipo: Journal article
Palavras-chave: Oscicular chain; Temporomadibular joint; Otic symptoms; Disco-malleolar ligament; Anterior malleolar ligament.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200011

A Dynamic Decision Support System for Farm Water Management in Surface Irrigation: Model Development and Application
Provedor de dados: 117
Autores: Flores,Carlos I.; Holzapfel,Eduardo A.; Lagos,Octavio.
An online dynamic decision support system (DDSS) was developed, to support the farm water management in surface irrigation. The online DDSS was based on the formulation and integration of three components: a dynamic-relational data base, an administrator model, and a graphical user interface. The DDSS allows routines of actualization, edition and addition of online data, providing information in real time. The online DDSS was applied in an orange orchard (Citrus sinensis L. Osbeck) cv. Valencia Late under furrow irrigation. The results pointed out that the time irrigation cutoff was the main significant management factor, to decrease the hazard of leaching, superficial runoff and percolation. Applying the results obtained with the DDSS, furrow irrigation...
Tipo: Journal article
Palavras-chave: Furrow irrigation; On-line irrigation management; Orange orchard.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200011

A fast and simple assay to quantify bacterial leukotoxin activity
Provedor de dados: 69
Autores: Oppermann,Tobias; Schwarz,Stefan; Busse,Nadine; Czermak,Peter.
Background: Mannheimia haemolytica is the primary bacterial pathogen in causing bovine respiratory disease with tremendous annual losses in the cattle industry. The leukotoxin from M. haemolytica is the predominant virulence factor. Several leukotoxin activity assays are available but not standardized regarding sample preparation and cell line. Furthermore, these assays suffer from a high standard error, a prolonged time consumption and often complex sample pretreatments, which is important from the bioprocess engineering point of view. Results: Within this study, an activity assay based on the continuous cell line BL3.1 combined with a commercial available adenosine triphosphate viability assay kit was established. The leukotoxin activity was found to be...
Tipo: Journal article
Palavras-chave: ATP assay; Bacterial pathogen; Bovine respiratory disease; Cattle industry; Critical parameters; Lipopolysaccharides; Mannheimia haemolytica; Microbial biotechnology; Polymyxin B; Quantification; Virulence.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600006

A herpes simplex viral vector expressing green fluorescent protein can be used to visualize morphological changes in high-density neuronal culture
Provedor de dados: 69
Autores: Falk,Torsten; Strazdas,Lori A.; Borders,Rebecca S.; Kilani,Ramsey K.; Yool,Andrea J.; Sherman,Scott J.
High-density cultures of mammalian neurons offer a model system for studies of brain development, but the morphological features of individual neurons is difficult to ascertain. We show that a herpes virus vector expressing a bioluminescent protein allows detailed morphometric analyses of living neurons in complex culture environments. Expression of enhanced green fluorescent protein (eGFP) was constitutively driven in neurons using the herpes simplex virus amplicon system. This system allowed us to make novel observations regarding development in high-density cultures from rat hippocampus and cerebellum. After the phase of initial neurite outgrowth, maturing neurons continue to show rapid remodeling of the neurite branches (0.79 ± 0.11 mum/h per neurite;...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000100004

A high-fat diet decreases GABA concentration in the frontal cortex and hippocampus of rats
Provedor de dados: 48
Autores: Sandoval-Salazar,Cuauhtemoc; Ramírez-Emiliano,Joel; Trejo-Bahena,Aurora; Oviedo-Solís,Cecilia I.; Solís-Ortiz,Martha Silvia.
BACKGROUND: It has been proposed that the &amp;#947;-aminobutyric acid (GABA) plays a key role in the regulation of food intake and body weight by controlling the excitability, plasticity and the synchronization of neuronal activity in the frontal cortex (FC). It has been also proposed that the high-fat diet (HFD) could disturb the metabolism of glutamate and consequently the GABA levels, but the mechanism is not yet clearly understood. Therefore, the aim of this study was to investigate the effect of a HFD on the GABA levels in the FC and hippocampus of rats RESULTS: The HFD significantly increased weight gain and blood glucose levels, whereas decreased the GABA levels in the FC and hippocampus compared with standard diet-fed rats CONCLUSIONS: HFD...
Tipo: Journal article
Palavras-chave: Obesity; GABA; Frontal cortex; Hippocampus; High-fat diet.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100015

A Histological Assessment of the Cell Death Induced by Haloperidol on Prefrontal Cortex
Provedor de dados: 77
Autores: Ghanbari,Ali; Kakebaraei,Seyran; Khazaei,Mozafar.
Neuroleptic drugs such as haloperidol has side effects on extrapyramidal pathways. Tardive Dyskinesia is the most important complication. The most characteristic feature of this Tardive Dyskinesia is involuntary movements of mouth and face. In regard to this problem, the induction of gliosis and cell death in the nervous tissue are considered. In this study, adult Sprague-Dawley rats were used as experimental models. Rats were divided into control and experimental groups. The rats were kept in the animal house under standard conditions during experiments. The control rats were intraperitoneally treated with normal saline for 6 days. The experimental samples were treated for the same time with 2, 5 and 10 mg haloperidol. After the trial period, the rats...
Tipo: Journal article
Palavras-chave: Haloperidol; Cerebral cortex; Optical microscopy; Cell death; Rat.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400046

A hybrid zone of two toad sister species, Rhinella atacamensis and R. arunco (Anura: Bufonidae), defined by a consistent altitudinal segregation in watersheds
Provedor de dados: 97
Autores: CORREA,CLAUDIO; MÉNDEZ,MARCO A; ARAYA,SERGIO; LOBOS,GABRIEL; PALMA,R. EDUARDO.
Delimiting the spatial extension of a hybrid zone is essential to understand its historical origin and to identify the geographical and/or environmental factors which delimit it. Rhinella atacamensis and R. arunco are two sister species which together inhabit Chile between 25° and 38° S. Their distribution limits coincide at about 32° S, where recently it was reported that they hybridize in a small watershed (Pupío creek). Although the genetic evidence suggests that these two species form a hybrid swarm, they are not mixed homogeneously in the entire watershed, but rather are spatially segregated: R. arunco is found in the lower part of the creek and R. atacamensis in the higher part. An extensive exploration north and south of 32° S revealed other...
Tipo: Journal article
Palavras-chave: AFLP markers; Chile; Control region; Hybridization; Toads.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000200001

A laboratory scale device for microencapsulation of genetically engineered cells into alginate beads
Provedor de dados: 69
Autores: León Fiszman,Gabriel; Karara,Armando Luis; Finocchiaro,Liliana María Elena; Glikin,Gerardo Claudio.
The microencapsulation of recombinant cells, widely used for in vitro high-density cell culture, is a novel and potentially cost-effective method of in vivo heterologous protein delivery, where the protein producing cells are immunologically protected from tissue rejection. We report here a simple, reliable and inexpensive laboratory method to generate calcium alginate microcapsules containing genetically engineered, interleukin-2 expressing, Chinese hamster ovary (CHO) cells.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300012

A legume genomics resource: The Chickpea Root Expressed Sequence Tag Database
Provedor de dados: 69
Autores: Jayashree,B; Buhariwalla,Hutokshi K; Shinde,Sanjeev; Crouch,Jonathan H.
Chickpea, a lesser-studied grain legume, is being investigated due to its taxonomic proximity with the model legume genome Medicago truncatula and its ability to endure and grow in relatively low soil water contents making it a model legume crop for the study of agronomic response to drought stress. Public databases currently contain very few sequences from chickpea associated with expression in root tissues. However, root traits are likely to be one of the most important components of drought tolerance in chickpea. Thus, we have generated a set of over 2800 chickpea expressed sequence tags (ESTs) from a library constructed after subtractive suppressive hybridization (SSH) of root tissue from two closely related chickpea genotypes possessing different...
Tipo: Journal article
Palavras-chave: Cloning; Data mining; Drought avoidance; Drought tolerance; EST database; Root traits; Stress.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200002

A LIGHT AIRCRAFT AS A LOW-FREQUENCY SOUND SOURCE FOR ACOUSTICAL OCEANOGRAPHY
Provedor de dados: 72
Autores: Buckingham,Michael J; Giddens,Eric M.
The sound from a propeller-driven aircraft is largely generated by the propeller itself. Its acoustic signature consists of a series of harmonics, the lowest of which, the fundamental, is typically in the region of 100 Hz, with the higher harmonics appearing at multiples of the fundamental. Experiments have recently been conducted off the coast of southern California, using several different types of single-engine, light aircraft, which show that the first 10 or so propeller harmonics are detectable not in the atmosphere, in the water column and also on sensors buried to a depth of about 1 m in the seabed. The Doppler-shifted comb of frequencies produced by an aircraft propeller is the basis of a recently developed technique for making point measurements...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200013

A light- and electron microscopic study of primordial germ cells in the zebra fish (Danio rerio)
Provedor de dados: 48
Autores: Deniz Koç,Nazan; Yüce,Rikap.
In sexually reproducing organisms, primordial germ cells (PGCs) give rise to the cells of the germ line, the gametes. In many animals, PGCs are set apart from somatic cells early during embryogenesis. This study explores the origin of primordial germ cells (PGCs) of the zebra fish and examines their morphology during early development (1st day-15th day). PGCs were selectively stained by the alkaline phosphatase histochemical reaction and viewed by light and electron microscopy from the time they are first detectable in the yolk sac endoderm. PGCs occurred in the subendodermal space on the syncytial periblast; differing from the surrounding endodermal cells. Later the PGCs moved to between the blastoderm and yolk sac and transferred to the dorsal mesentery...
Tipo: Journal article
Palavras-chave: Primordial germ cell; Zebra fish; Ultrastructure; Morphology.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000400001

A Limit for Antler Length in Captive Marals
Provedor de dados: 77
Autores: Korzhikenova,N; Sambetbaev,A; Iglikov,O; Parés-Casanova,P. M.
The main aim of this study was to estimate phenotypic correlations among live weight, withers height, rump height, chest depth, chest width, thoracic girth, body length, hip widths (between iliac tuberosities and between ischial tuberosities) and forelimb cannon perimeter with antler length measured during the growth of marals on a Kazakh farm. The data comprised 18 animals studied during their growth (at 18 months and at 24 months). In maral, the first period of antler productivity takes place at the age of 24 months. This fact should be taken into account in order to select the best animals for antler production, which is the main purpose for farming this species.
Tipo: Journal article
Palavras-chave: Phenotypic correlation; Maral; Morphological traits.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200031

A los 150 años desde "El origen de las especies": ¿es darwinista la biología contemporánea?
Provedor de dados: 97
Autores: FOLGUERA,GUILLERMO; BOZINOVIC,FRANCISCO.
A los 150 años de la publicación de "El origen de las especies" de Charles Darwin, numerosos homenajes se han realizado en diferentes ciudades del mundo. Sin embargo, es importante preguntarse hacia el seno de la comunidad científica acerca del alcance efectivo del darwinisimo dentro de la biología. En este trabajo analizamos este supuesto intentando responder, al menos de una manera aproximativa, la pregunta: ¿es darwinista la biología en la actualidad? A estos fines, consideramos algunos de los principales aportes que suelen asignarse al darwinismo en las ciencias de los sistemas vivos: el análisis y centro en la diversidad, un origen único de los sistemas vivos, la incorporación del azar y el reconocimiento de las causas proximales. En términos...
Tipo: Journal article
Palavras-chave: Causas próximas; Darwinismo; Diversidad biológica.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400003

A low-protein diet during pregnancy prevents modifications in intercellular communication proteins in rat islets
Provedor de dados: 48
Autores: Marçal-Pessoa,Ana Flávia; Bassi-Branco,Carmen Lucia; Salvatierra,Cristiana dos Santos Barbosa; Stoppiglia,Luiz Fabrizio; Ignacio-Souza,Letícia Martins; Reis,Sílvia Regina de Lima; Veloso,Roberto Vilela; Reis,Marise Auxiliadora de Barros; Carneiro,Everardo Magalhães; Boschero,Antonio Carlos; Arantes,Vanessa Cristina; Latorraca,Márcia Queiroz.
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Tipo: Journal article
Palavras-chave: Connexin 36 Connexin 43 &amp;#946; -catenin Low protein diet Pregnancy Pancreatic islets Rat.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100003

A Lux-like Quorum Sensing System in the Extreme Acidophile Acidithiobacillus ferrooxidans
Provedor de dados: 48
Autores: RIVAS,MARIELLA; SEEGER,MICHAEL; HOLMES,DAVID S; JEDLICKI,EUGENIA.
The genome of the acidophilic, proteobacterium Acidithiobacillus ferrooxidans, contains linked but divergently oriented genes, termed afeI and afeR, whose predicted protein products are significantly similar to the LuxI and LuxR families of proteins. A possible promoter and Lux box are predicted upstream of afeI. A cloned copy of afeI, expressed in E. coli, encodes an enzyme that catalyzes the production of a diffusible compound identified by gas chromatography and mass spectrometry as an unsubstituted N-acyl homoserine lactone (AHL) of chain length C14. This AHL can be detected by a reporter strain of Sinorhizobium meliloti Rm41 suggesting that it is biologically active. The reporter strain also responds to extracts of the supernatant of A. ferrooxidans...
Tipo: Journal article
Palavras-chave: A. ferrooxidans; Quorum-sensing; LuxI and LuxR; Lux box; Homoserine lactone.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000200018

A Macroanatomical and Histological Study of the Uropygial Gland in the White Stork (Ciconia cicionia)
Provedor de dados: 77
Autores: Kozlu,Tolunay; Bozkurt,Yesim Akaydin; Ates,Sevinc.
The present study was aimed at the macroanatomical and histological investigation and the demonstration of the structural characteristics of the uropygial gland in the white stork. The uropygial gland of two adult male white storks constituted the material of the study. It was determined that the gland was situated subcutaneously in between the caudal aspect of the lumbosacral bone and the first coccygeal vertebrae. The gland was composed of two lobes, which displayed an oval appearance when viewed from above and resembled a water drop when observed medially. Tuft of feathers were present on the caudal margin of each lobe. The present study revealed that the uropygial gland of the white stork is a simple tubular gland, which discharges its secretion into...
Tipo: Journal article
Palavras-chave: White stork; Uropygial gland; Anatomy; Histology.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300010

A Manuscript Writing Course for Biochemistry Undergraduates and Graduate Students in the Biomedical Sciences
Provedor de dados: 69
Autores: Glew,Robert H.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100001

A microbial community analysis of the octocoral Eunicea fusca
Provedor de dados: 69
Autores: Duque-Alarcón,Angela; Santiago-Vázquez,Lory Z; Kerr,Russell G.
While there is a significant and growing body of knowledge describing the microbial communities of marine invertebrates such as sponges, there are very few such studies focused on octocorals. The octocoral Eunicea fusca is common on reefs in various regions of the Caribbean and has been the subject of natural product investigations. As part of an effort to describe the microbial community associated with octocorals, a culture-independent analysis of the bacterial community of E. fusca was conducted. Specifically, a 16S rDNA clone library analysis was performed to provide baseline data. A total of 40 bacteria members from 11 groups were found. In general, Proteobacteria were the dominant group with a total of 24 species and &amp;#945;-Proteobacteria...
Tipo: Journal article
Palavras-chave: 16S rDNA; Bacteria; Culture-independent analysis; Eunicea fusca; Microbial community; Octocoral.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500015

A micromethod for high throughput RNA extraction in forest trees
Provedor de dados: 48
Autores: LE PROVOST,GREGOIRE; HERRERA,RAÚL; PAIVA,JORGE AP; CHAUMEIL,PHILIPPE; SALIN,FRANCK; PLOMION,CHRISTOPHE.
A large quantity of high quality RNA is often required in the analysis of gene expression. However, RNA extraction from samples taken from woody plants is generally complex, and represents the main limitation to study gene expression, particularly in refractory species like conifers. Standard RNA extraction protocols are available but they are highly time consuming, and not adapted to large scale extraction. Here we present a high-throughput RNA extraction protocol. This protocol was adapted to a micro-scale by modifying the classical cetyltrimethylammonium (CTAB) protocol developed for pine: (i) quantity of material used (100-200 mg of sample), (ii) disruption of samples in microtube using a mechanical tissue disrupter, and (iii) the use of SSTE buffer....
Tipo: Journal article
Palavras-chave: RNA extraction; Micromethod; Forest trees.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000400003

A Model for the Estimation of Personal Stature from the Length of Forearm
Provedor de dados: 77
Autores: Ilayperuma,Isurani; Nanayakkara,Ganananda; Palahepitiya,Nadeeka.
Prediction of stature from incomplete and decomposing skeletal remains is vital in establishing the identity of an unknown individual. It has been stated that a variety of factors such as race, gender and nutrition play an important role in determining the height of an individual. Estimation of stature from measurements of various long bones has been achieved with varying degree of accuracy. Those studies resulted in establishing different formulae for the estimation of stature for the respective populations. However, evidence shows that there is a great void in such norms for Sri Lankans. Hence, this study was designed to investigate the relationship and to propose a gender and age specific linear regression models between the ulna length and height of an...
Tipo: Journal article
Palavras-chave: Height; Ulna; Sri Lankan; Regression equation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400015

A molecular marker approach using intron flanking EST-PCR to map candidate genes in peach (Prunus persica)
Provedor de dados: 69
Autores: Diez-de-Medina,Sergio; Silva,Herman.
In Peach (Prunus persica) several physiological changes, such as woolliness, triggered by chilling injury are involved in major production losses due to cold storage of the fruits during shipping. Additionally, the low level of polymorphisms among peach varieties is an important limitation in the search for new molecular markers that could be associated with economically important traits. Therefore, a functional approach was employed to associate candidate genes with an informative marker in peach. The data was obtained from the results of an in silico analysis of four different cold peach treatments. Thirty two candidate genes were selected that were aligned against Arabidopsis thaliana genomic sequences to design intron-flanking EST-PCR markers. These...
Tipo: Journal article
Palavras-chave: Bin mapping; Molecular markers; Prunus; Rosaceae.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500007

A Morphological and Biometric Study of the Infraorbital Foramen (E2 - Sibai Point) in Adult Skulls
Provedor de dados: 77
Autores: Oliveira Junior,E. M. de; Moreira,R. T; Neto,B. L; Silva,C. M. F. da; Lima,F. J. C.
The objective of this work was to study the morphology and biometry of the infraorbital foramen (FIO), variations in its shape, size and number as well as to obtain measurements of its location. 60 dry skulls were analyzed. The test of Qui-quadrant and the T Test were used in measurements with a 5% significance. On the right side, the FIO was measured at a distance of 6.49(±1.68) mm from the lower, 39.65(±3) mm from the upper, 17.7(±2.97) mm from the medial and 20.46(±2.9) mm from the lateral margin of the orbit; its pear-shaped opening distance was 13.67(±2.17) mm. On the left side, the distance of the FIO to the lower margin of the orbit was 6.52(±1.82) mm; to the upper margin was 39.9(±2.62) mm and to the lateral and medial margin were 17.93(±2.58) mm...
Tipo: Journal article
Palavras-chave: Infraorbital foramen (E2-Sibai Point); Acupuncture; Biometry.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300036

A Morphological Study of the Dorsum Sellae in Human Skull
Provedor de dados: 77
Autores: Haider,Syed Javed; Rezigalla,Assad Ali; Abdalla,Asim Mohammed.
Anatomical variations in the shape and dimension of the dorsum sellae and posterior clinoid process are common. Most textbooks describe its shape as a median rectangular plate, a square plate, or a transverse ledge on a slope behind the sella turcica (hypophyseal fossa). This work aims to study the dorsum sellae of human skull. One hundred and twenty five dried adult human skulls, irrespective of age, were used for the study. Detailed features of the dorsum sellae were noted and classified into five types: crest like, thin plate, frail quadrilateral plate, heavy square plate, thick elongated plate. Fusion of the posterior and middle clinoid processes in one (unilateral) and all the clinoid processes (anterior, middle, and posterior) in three skulls...
Tipo: Journal article
Palavras-chave: Dorsum sellae; Clinoid process; Anatomical variations; Skull.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400001

A Morphological Study of the Suprascapular Notch in a Sample of Scapulae at the University of Kwazulu Natal
Provedor de dados: 77
Autores: Manikum,C; Rennie,C; Naidu,E. C. S; Azu,O. O.
The suprascapular notch (SSN) is important, as it is a risk factor in the development of suprascapular nerve entrapment syndrome. The purpose of this study is to describe the morphology of the SSN of a sample of normal scapulae in the Discipline of Clinical Anatomy, University of KwaZulu Natal. Sixty scapulae were used consisting of 37 males and 23 females (mean age 51 years). The superior transverse diameter and maximal depth of the notches were measured. Comparisons were made of the notch in relation to the maximal width and length of the scapulae, laterality and sex. The Rengachary classification method was adopted to describe the shape of the SSN. Analysis of morphological variations showed Type II- wide blunted V-shaped notch to be predominant (65%)....
Tipo: Journal article
Palavras-chave: Suprascapular notch; Morphology; Clinical anatomy; Nerve entrapment.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400029

A Morphometric Study of the Extraocular Muscles
Provedor de dados: 77
Autores: Villarreal-Silva,Eliud Enrique; Hinojosa Amaya,José Miguel; Bazaldua Cruz,Juan José; Martínez Fernández,David; Elizondo-Omaña,Rodrigo Enrique; Guzmán López,Santos.
Extraocular muscles are important references in strabismus surgery and in placement of intraorbital devices. We analyzed extraocular muscles morphometry and possible anatomical variances of 20 orbits. We report the length, width, and points of insertion of the extraocular muscles. No anatomical variations in length, width and points of insertion were found. With regard to the rectus muscles, it was found that the superior rectus and lateral rectus are the longest muscles and that the width difference between the superior and inferior rectus is greater than that between the medial and lateral rectus and that the point of insertion of the rectus muscles has a variable morphology. The superior oblique muscle was smaller in caliber than the inferior oblique,...
Tipo: Journal article
Palavras-chave: Extraocular muscles; Morphometry; Orbits.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100049

A Morphometric Study on the Skull of Donkey (Equus asinus)
Provedor de dados: 77
Autores: Zhu,Lei; Shi,XiaoDong; Wang,JunJie; Chen,JianGang.
The present study was carried out on a number of 16 skulls of adult male domestic donkeys. Craniometric measurements for 40 different parts of the skulls were made. All investigated features were expressed as Mean±SD. Cephalic indices and ratios were calculated by using the investigated features. The craniometric measurements and cephalic indices had been compared with those of local horses and ponies. A skull length of 443.07±53.57 mm and a maximum zygomatic width of 169.09±17.64 mm were obtained. The size of donkey skull was between those of local horses and ponies. A skull index of 38.23±0.85, a cranial index of 45.01±2.83 and a facial index of 67.80±3.79 were obtained. Cranial index and skull index were found to be close in value to that of local...
Tipo: Journal article
Palavras-chave: Skull; Donkey; Craniometry.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400030

A most effective method for selecting a broad range of short and medium-chain-length polyhidroxyalcanoate producing microorganisms
Provedor de dados: 69
Autores: Revelo Romo,Dolly Margot; Grosso,María Victoria; Moreno Solano,Nubia Carmenza; Montoya Castaño,Dolly.
A molecular approach was used for selecting polyhydroxyalcanoate (PHA)-accumulating potential Gram-negative bacteria from different genera by colony polymerase chain reaction (PCR). Three degenerate primers were designed for amplifying a fragment from PHA synthase gene (phaC) (Class I), phaC1 and phaC2 (Class II) genes for detecting PHA-producing bacteria. Thirty-four out of 55 bacterial strains from the old collection selected using Sudan black B staining were phaC+. PCR was used for directly selecting 35 new collection bacterial strains; these strains were phaC+ and their ability to produce PHA was confirmed by Sudan black B staining. Four specific primers were designed on genes of Class II PHA biosynthesis operon. These primers were used for evaluating...
Tipo: Journal article
Palavras-chave: 16S rDNA; Colony PCR; Degenerate primers; PHA synthase; Polyhydroxyalcanoate; Seminested PCR.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300002

A multivariate analysis of taxonomic limits in Diplolaemus Bell 1843
Provedor de dados: 72
Autores: Victoriano,Pedro F; Coronado,Tanía M; Ortiz,Juan Carlos.
The gemís Diplolaemus Bell, 1843 is a common squamate component of the Patagonian región of South América. Considerable taxonomic confusión exists within this gemís, particularly about the status of Chilean-Andean populations and the actual distribution of D. leopardinas (Werner, 1898). In an attempt to clarify the taxonomic status and distribution of Diplolaemus species, we performed a principal component analysis (PCA) and discriminant function analysis (DFA) using both standard morphometric and meristic data. Multivariate summaries of morphometric data show that most species are poorly discriminated, with the exception of D. darwinii. In contrast, a PCA analyses performed on the meristic data clearly distinguish three discrete groups: 1. D. darwinii, 2....
Tipo: Journal article
Palavras-chave: Species limits; Taxonomy; Patagonia; Polychrotidae.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100006

A nationwide biotechnology outreach and awareness program for Malaysian high schools
Provedor de dados: 69
Autores: Firdaus-Raih,Mohd; Senafi,Sahidan; Munir Murad,Abdul; Marzuki Sidik,Nik; Kiew Lian,Wan; Daud,Fauzi; Zainal Ariffin,Shahrul Hisham; Zamrod,Zulkeflie; Chon Seng,Tan; Sofiman Othman,Ahmad; Azni Harmin,Sharr; Radzuan Saad,Mohd Yusof; Mohamed,Rahmah.
Biotechnology education in developing nations remains one of the rate limiting factors in achieving optimal human resource capacity to drive and tap the bio-resources of these nations. Many developing countries are situated within rich bio-diversity enclaves. Biotechnology offers the promise of tapping these bio resources towards due process of developing these nations. While there may be a steady stream of biology and biotechnology based graduates, from Malaysian as well as foreign universities contributing to the human resource base for these countries, the numbers and knowledge diversity produced, still lack the capacity to optimally power research and development as well as supply the industrial biotechnology sectors of these countries. Realizing the...
Tipo: Journal article
Palavras-chave: Biotechnology awareness; Biotechnology education; Capacity building.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100004

A neutral cue facilitates detection of a visual target by modulating attention
Provedor de dados: 48
Autores: HAMAME,CARLOS M; DELANO,PAÚL H; ROBLES,LUIS.
Twelve rats were trained to perform a two-choice visual detection task in which a right or left light was presented and the animáis were required to press the lever located under the illuminated light for a food reward. In seventy percent of the triáis the target light was preceded by presentation of a neutral cue (a central light). Relevance of the neutral cue for detection of the target was analyzed by comparing behavioral Índices of attention in its presence and absence. Accuracy was significantly higher in presence than in absence of the neutral cue, while mean response latencies were lower in presence than in absence of the neutral cue. These results indicate that the animáis allocated attentional resources on the target detection during a high...
Tipo: Journal article
Palavras-chave: Alerting effect; Attention; Detection task; Expectancy; Neutral cue; Rat.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000400012

A new approach to chemical modification protocols of Aspergillus niger and sorption of lead ion by fungal species
Provedor de dados: 69
Autores: Rafiu Awofolu,Omotayo; Okechukwu Okonkwo,Jonathan; Roux-Van Der Merwe,Renate; Badenhorst,Jackie; Jordaan,Erika.
Biomasses of five fungi species (Aspergillus niger, Penicillium austurianum, Saccharomyces cerevisiae, Mucor arcindloides and Trichoderma reesi were evaluated for their uptake of lead ion from aqueous solution using batch systems. Both dead and live fungal biomasses were comparatively studied for their adsorption efficiencies. The effect of pH as one of the primary factors that influences sorption efficiency of metal ions in solution was also studied. Modification of the fungal biomass with the least sorption capacity was carried out using a four-step procedure. Three different modifying agents under the optimised experimental conditions were used. The percentage uptake of lead ion by fungi species ranged from: Aspergillus niger: 6.71-64.95% and...
Tipo: Journal article
Palavras-chave: Aspergillus niger; Fungi species; Lead ion; Modification; Sorption.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400001

A new geographic record of the endangered Darwin's fox Lycalopex fulvipes (Carnivora: Canidae): filling the distributional gap
Provedor de dados: 97
Autores: D'ELÍA,GUILLERMO; ORTLOFF,ALEXANDER; SÁNCHEZ,PAMELA; GUIÑEZ,BASILIO; VARAS,VALERIA.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400010

A NEW INVASIVE FRESHWATER FISH SPECIES IN CENTRAL CHILE: JENYNSIA MULTIDENTATA (JENYNS, 1842) (CYPRINODONTIFORMES: ANABLEPIDAE)
Provedor de dados: 72
Autores: Quezada-Romegialli,Claudio; Vila,Irma; Véliz,David.
Se reporta la presencia de la especie Jenynsia multidentata en Chile central, avistada en agosto de 2008 en la localidad de Peñaflor. Durante 2009 se registra en la confluencia del estero Puangue y el río Maipo, extendiendo su distribución a un amplio sector de este estero. Jenynsia multidentata corresponde a la 26ª especie íctica introducida al país.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000200007

A new low molecular mass alkaline cyclodextrin glucanotransferase from Amphibacillus sp. NRC-WN isolated from an Egyptian soda lake
Provedor de dados: 69
Autores: Al-Sharawi,Samar Z.R.; Ibrahim,Abdelnasser S.S.; El-Shatoury,Einas H; Gebreel,Hassan M; Eldiwany,Ahmad.
Background: Cyclodextrin glucanotransferase (CGTase) is one of the most industrially important enzymes used in the commercial production of cyclodextrins (CDs). Alkaliphilic bacteria have attracted much interest in the last few decades because of their ability to produce extracellular enzymes that are active and stable at high pH values. Here, we report the isolation of a new CGTase from alkaliphilic bacteria collected from Egyptian soda lakes and describe the purification and biochemical characterization of this CGTase. Results: Screening for CGTase-producing alkaliphilic bacteria from sediment and water samples collected from Egyptian soda lakes located in the Wadi Natrun valley resulted in the isolation of a potent CGTase-producing alkaliphilic...
Tipo: Journal article
Palavras-chave: Amphibacillus sp; Cyclodextrin glycosyltransferase; Cyclodextrins; Wadi Natrun soda lakes.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600003

A new method: measurement of microleakage volume using human, dog and bovine permanent teeth
Provedor de dados: 69
Autores: Yavuz,Izzet; Aydin,Haluk; Ulku,Refik; Kaya,Sadullah; Tumen,Caner.
This study investigates the feasibility of a different new approach to determining the microleakage volume associated with dental restorations (Class V cavity restorated with glass ionomer cement + high copper amalgam) and the relative marginal adaptation deficiency of dog, bovine and human permanent teeth in in vitro conditions. Also researched is the appropriateness of using dog and bovine teeth in in vitro studies rather than human teeth. Our method utilizes the molecular adsorption characteristics of methylene blue. Within the framework of this study, 60 permanent teeth (20 human, 20 dogs and 20 bovine) were used. These groups were evaluated statistically, of which indicated no statistically significant differences (p &gt; 0.05). It was also concluded...
Tipo: Journal article
Palavras-chave: Dye adsorption test; Microleakage; Tooth.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100003

A new Morphological Classification of the Anterior Inferior Iliac Spine: Relevance in Subspine Hip Impingement
Provedor de dados: 77
Autores: Morales-Avalos,Rodolfo; Leyva-Villegas,Jorge I; Sánchez-Mejorada,Gabriela; Méndez-Aguirre,Omar; Galindo-Aguilar,Oscar Ulises; Quiroga-Garza,Alejandro; Villarreal-Silva,Eliud E; Vílchez-Cavazos,Félix; Galván,José R.B; Elizondo-Omaña,Rodrigo E; Guzmán-López,Santos.
Femoroacetabular impingement syndrome (FAI) is a clinical entity that has been recognized in recent years as a frequent cause of pain and the early development of hip arthrosis. Subspine hip impingement is characterized by the prominent or abnormal morphology of the anteroinferior iliac spine (AIIS), which contributes to the development of a clinical picture that is similar to FAI. The aims of this study were to propose a new morphological classification of the AIIS, to determine the prevalence of the different AIIS morphologies based on this classification and to correlate the presence of said morphologies with different gender and age groups. The sample consisted of 458 hemipelvises from individuals of known age and sex (264 men and 194 women). Each...
Tipo: Journal article
Palavras-chave: Prevalence; Anterior inferior iliac spine; Subspine impingement; Classification; Morphology; Hip.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200034

A NEW NAME IN SECTION ANDINIUM W. BECKER OF THE GENUS VIOLA L. (VIOLACEAE)
Provedor de dados: 73
Autores: Watson,John M.; Flores,R.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200009

A NEW NORTHERN LIMIT FOR THE DISTRIBUTION OF RANUNCULUS SPEGAZZINII LOURTEIG (RANUNCULACEAE) IN CHILE
Provedor de dados: 73
Autores: Lehnebach,Carlos A; Rivero,Magaly; Ezcurra,Cecilia; Lockhart,Peter J.
Se informa la colecta de Ranunculus spegazzinii Lourteig en la IX Región de Chile (38°S). Este nuevo registro extiende el límite norte de distribución de esta especie en Chile en c. 1400 km. Además se presenta un mapa con los puntos de colecta de R. spegazzinii e imágenes del nectario y aquenio obtenidas en el microscopio electrónico de barrido
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200009

A new population of Darwin's fox (Lycalopex fulvipes) in the Valdivian Coastal Range
Provedor de dados: 97
Autores: Farias,Ariel A; Sepúlveda,Maximiliano A; Silva-Rodríguez,Eduardo A; Eguren,Antonieta; González,Danilo; Jordán,Natalia I; Ovando,Erwin; Stowhas,Paulina; Svensson,Gabriella L.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100003

A New Quantitative Method for Predicting Forensic Racial Identity Based on Dental Morphological Trait Analysis
Provedor de dados: 77
Autores: Alsoleihat,Firas.
Few previous studies have demonstrated the likelihood of using the worldwide patterns of dental morphological variation in prediction of ancestry in the context of forensic dental anthropology. This paper introduces a new quantitative method for predicting forensic racial identity of individual specimens based on dental morphological trait analysis. In this study, the inter-population variation in the expression frequency of 16 non-metric tooth crown traits, manifested on the permanent dentition, was used for analysis. The method was developed from the notion that dental morphological characteristics, when viewed as sets of traits rather than isolated variables, can be utilized to calculate the relative probability that an individual belongs to a...
Tipo: Journal article
Palavras-chave: Forensic dental anthropology; Non-metric tooth crown traits; Racial identification.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200009

A NEW RECORD OF A SOCIAL SPIDER, ANELOSIMUS LORENZO FOWLER AND LEVI, 1979 (ARANEAE, THERIDIIDAE), FROM A TEMPERATE ZONE (URUGUAY)
Provedor de dados: 72
Autores: Viera,Carmen; García,Luis F.
Se registra Anelosimus lorenzo para Uruguay, constituyendo el hallazgo más austral de la especie. El presente registro confirma la inusual presencia de una araña social para una zona de clima templado. Con este nuevo reporte, el número de especies de Anelosimus conocidas para este país se eleva a tres.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000200008

A new record of Equus (Mammalia: Equidae) from the Late Pleistocene of central-south Chile
Provedor de dados: 97
Autores: RECABARREN,OMAR P; PINO,MARIO; CID,INÉS.
Fourteen dental and bone parts of a horse excavated from the Pilauco paleontological site, Osorno (40°39' S-73°07' W) are analysed and interpreted. This site was formed in association with a peat bog located on the banks of the old Damas River and has conserved abundant late Pleistocene mammalian fauna and flora materials. A date of 11457 ± 140 14C yrs B.P. was obtained from a molar and agrees with our stratigraphic age model. We have identified the fossils as pertaining to the species Equus (Amerhippus) andium, which confirms its presence in central-south Chile. Furthermore, the recorded geographic location indicate that the metapodial adaptations of the specimens previously described agree with the reconstructed late Pleistocene landscape of Pilauco,...
Tipo: Journal article
Palavras-chave: Equus; Equus (Amerhippus) andium; Late Pleistocene; Pilauco.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000400006

A new species of Telmatobufo (Schmidt 1852) (Anura, Calyptocephalellidae) from a remnant of the Maulino Forest, central Chile
Provedor de dados: 72
Autores: Cuevas,César C.
A new species, Telmatobufo ignotus, from the Reserva Nacional Los Queules, Cauquenes Province, central Chile is described herein. The new taxon is hypothesized based on a new combination of adult, larval, and chromosomal characters. The new species present the more septentrional distribution on the coastal range and a very restrictive distribution area compared to its congeners; because of this, taxonomic and conservation comments are discussed and advanced.
Tipo: Journal article
Palavras-chave: New species; Anura; Telmatobufo; Morphology; Chromosomes; Central Chile.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200004

A New Statistical Method for Comparative Anatomy
Provedor de dados: 77
Autores: Aversi-Ferreira,Tales Alexandre.
Rules, formulas and statistical tests have been widely used in studies that use continuous variables in the normal or Gaussian distribution or other tests whose data fit this type of distribution (t and z distributions) and whose parameters can be defined. However, there are cases in which the model and goal of the scientific work allow only the use of discrete or nominal variables. The absence or presence of a structure or organ (muscles, nerves, blood vessels, bones, and ligaments), characteristics associated with these organs, such as the source of nerves, vessels and muscles and the distribution of nerves and vessels are discrete and / or nominal variables that do not fit the Gaussian distribution, nor of z or t, unless the measures of these structures...
Tipo: Journal article
Palavras-chave: Morphology; Comparative anatomy; Statistical method.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400016

A new variety of Bacopa monnieri obtained by in vitro polyploidization
Provedor de dados: 69
Autores: Salvio Escandón,Alejandro; Hagiwara,Juan Carlos; Alderete,Liliana Marisol.
The commercial value of Bacopa monnieri, a widespread herbaceous plant in Argentina, can be substantially improved increasing its flower size by chromosome doubling with colchicine. MS supplemented with 0.25 mg/L of 6-benzylaminopurine proved to be an appropriate medium for the in vitro multiplication of nodal segments of B. monnieri. Polyploidization was achieved submerging nodal segments during 24 or 48 hrs in colchicine solution 0.001 and 0.01% P/V, in 1% DMSO. Segments submerged in water and in DMSO 1% aqueous solution were used as controls. DNA contents from recovered plants was measured and characterized and their phenotype described. Two tetraploid plants originated from independent events were detected. These plants showed significant differences...
Tipo: Journal article
Palavras-chave: Colchicine; Flow cytometry; Ornamental plants; Scrophulariaceae; Tetraploid.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300002

A note on stability in food matrices of Salmonella enterica serovar Enteritidis-controlling bacteriophages
Provedor de dados: 69
Autores: Robeson,James; Turra,Gabriel; Huber,Karen; Borie,Consuelo.
Background Lytic bacteriophages are bacterial viruses that upon infection kill their host cells and therefore have re-emerged as biological control agents of bacterial pathogens, particularly in the field of food related infections. Here, we investigated the stability in different food matrices of five phage isolates capable of controlling the foodborne pathogen Salmonella enterica serovar Enteritidis (SE). Results We found that two phages, originally isolated from food sources, were up to 5 logs more stable than three phages isolated from sewage, in ten food matrices (fresh and processed) at both 4°C and 18°C. Conclusion Lytic phages isolated from contaminated food sources seem to be a better choice when structuring phage cocktails to be used in the...
Tipo: Journal article
Palavras-chave: Biocontrol; Foodstuffs; Phage.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000400008

A novel chloroplastic isopentenyl diphosphate isomerase gene from Jatropha curcas: Cloning, characterization and subcellular localization
Provedor de dados: 69
Autores: Wei,Lei; Yin,Li; Hu,Xiaole; Xu,Ying; Chen,Fang.
Background Jatropha curcas is a rich reservoir of pharmaceutically active terpenoids. More than 25 terpenoids have been isolated from this plant, and their activities are anti-bacterial, anti-fungal, anti-cancer, insecticidal, rodenticidal, cytotoxic and molluscicidal. But not much is known about the pathway involved in the biosynthesis of terpenoids. The present investigation describes the cloning, characterization and subcellular localization of isopentenyl diphosphate isomerase (IPI) gene from J. curcas. IPI is one of the rate limiting enzymes in the biosynthesis of terpenoids, catalyzing the crucial interconversion of isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP). Results A full-length JcIPI cDNA consisting of 1355 bp was cloned....
Tipo: Journal article
Palavras-chave: Heterologous expression; Southern blot; Terpenoids; Transient expression.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600007

A Novel Method for Localizing Nerve Entry Points During Spasticity Treatment
Provedor de dados: 77
Autores: Yang,Shengbo; Hu,Shuangjiang; Tian,Xufeng; Hu,Shuaiyu.
The nerve entry points (NEPs) cannot be accurately localized for the treatment of muscle spasticity in neurolysis. The aim of this study was to develop a new method of accurately localizing nerve entry points in relation to bony landmarks. NEPs in human cadavers were coated with barium sulfate. Method 1 consisted of horizontal and longitudinal reference lines being designated based on bony landmarks, followed by radiography and measurements using picture archiving and communication system software. Method 2 involved sewing the barium sulfate-soaked suture thread into the skin to designate the horizontal and longitudinal reference lines, followed by computed tomography (CT) scanning to determine the skin surface location and puncture depth for the NEPs....
Tipo: Journal article
Palavras-chave: Spasticity; Nerve entry points; Anatomy; X-ray; Localization.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300002

A Novel Path of Communication from Kidney to the Adrenal Gland in Bactrian Camels (Camelus bactrianus)
Provedor de dados: 77
Autores: Ye,Wenling; Wang,Fengling; Lv,Shuangyu; Wang,Yange; Dong,Shuo; Wang,Jianlin.
The adrenal gland is an important endocrine organ in vertebratesthat produces a wide variety of hormones. The anatomical results showed that the adrenal gland in Bactrian camel had a typical blood supply and innervation. Surprisingly, we found that there was a novel connection mainly consisted of fibrous tissue, blood vessels and nerve bundles between the adrenal gland and the kidney in Bactrian camel, and we named it fibrous tissue-blood vessels-nerve bundles (FBN bundle). To the best of our knowledge, this FBN bundle was the first reported in Bactrian camel, and not yet observed in other animals. While, its functions and mechanisms should be studied further. We speculated that a direct function of this novel path might be to strengthen the communication...
Tipo: Journal article
Palavras-chave: Anatomical; Adrenal gland; FBN bundle; Blood supply; Bactrian camels.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400044

A novel pH-stable, endoglucanase (JqCel5A) isolated from a salt-lake microorganism, Jonesia quinghaiensis
Provedor de dados: 69
Autores: Lin,Ling; Liu,Xiaozhou; Zhou,Yating; Guan,Linyan; Jiajia,He; Huang,Weiqian.
Background: Endoglucanase, one of three type cellulases, can randomly cleave internal p-1,4-linkages in cellulose polymers. Thus, it could be applied in agricultural and industrial processes. Results: A novel endoglucanase gene (JqCel5A) was cloned from Jonesia quinghaiensis and functionally expressed in Escherichia coli Rosetta (DE3). It contained 1722 bp and encoded a 573-residue polypeptide consisting of a catalytic domain of glycoside hydrolase family 5 (GH5) and a type 2 carbohydrate-binding module (CBM2), together with a predicted molecular mass of 61.79 kD. The purified JqCel5A displayed maximum activity at 55°C and pH 7.0, with 21.7 U/mg, 26.19 U/mg and 4.81 U/mg towards the substrate carboxymethyl cellulose, barley glucan and filter paper,...
Tipo: Journal article
Palavras-chave: Protein modeling Site-directed mutagenesis Cellulases Recombinant endoglucanase gene Catalytic domain ofglycoside hydrolase Carbohydrate-binding module High pH stability Tolerance to deleterious chemicals; Tolerance to heavy metals Tolerance to detergents.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600009

A PBL MODEL WITH ORGANIZED LARGE EDDIES FOR MESOSCALE-SYNOPTIC-GLOBAL WINDS
Provedor de dados: 72
Autores: Brown,Robert A.
The University of Washington PBL model is a nonlinear similarity model (with organized large eddies in an equilibrium mean flow) suitable for km-scale to General Circulation Model or Climate numerical models. The theory and verification for this solution are now well established. Researchers who work with winds in the boundary layer with scales from point to 20-km regimes must be aware of this horizontal inhomogenuity in the PBL flow to avoid significant errors. Since the OLE contribute advectively to the mean flow there can be 10-20% (or more) increase in surface winds and fluxes over K-theory models. The model is described and several applications have been made
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200010

A phage display combined with DNA affinity magnetic system can be applied to a screening of DNA binding proteins, such as transcription factors
Provedor de dados: 69
Autores: Yulita,Kusumadewi Sri; Kouno,Takafumi; Ezaki,Bunichi.
Here we introduce a new approach for the screening of DNA binding proteins, using a phage library based on a phage display technique. In principal, a complementary DNA (cDNA) library based on the recombinant bacteriophage T7 expressing target proteins on its capsid (phage display) is constructed. These phage particles are hybridized with a biotinylated target DNA fragment which is immobilized on the surface of streptavidin paramagnetic particle (SA-PMP). The phage particles are released from the target DNA fragment by a nuclease treatment and the recovered phages are used to the next round of hybridization. These processes are repeated three times to amplify the target phages in the population. This simple method is faster, and more systemic than other...
Tipo: Journal article
Palavras-chave: AtGST11 gene; Biopanning; DNA binding proteins; T7 phage differential display; Transcription factors.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100014

A Pilot Study of the Mandibular Angle and Ramus in Indian Population
Provedor de dados: 77
Autores: Rai,Rajalakshmi; Ranade,Anu Vinod; Prabhu,Latha Venkatraya; Pai,Mángala M; Madhyastha,Sampath; Kumaran,Mángala.
To evaluate the mandibular angle and to analyze the relationship of the angle and height &amp;amp; breadth of the ramus of the mandible to the gender, so as to study its role in the anthropological diagnosis. The angle, height and breadth of the ramus of adult dry human mandibles of both sexes were measured using a goniometer. The values obtained were analyzed statistically. The present study showed a statistically significant difference in the mandibular angle as well as height of the ramus between both the sexes. The mean mandibular angle of Indian population when compared to that of European population was found to be lower by 9 degrees. The findings of this study might be useful in providing anthropological data that can also be used in dental and...
Tipo: Journal article
Palavras-chave: Mandíbula; Mandibular angle; Ramus of the Mandible; Indian population.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200019

A pilot study on genetic variation in purine-rich elements in the nephrin gene promoter in type 2 diabetic patients
Provedor de dados: 48
Autores: GONZÁLEZ,RODRIGO; TIRADO,ARES; BALANDA,MONSERRAT; ALVO,MIRIAM; BARQUÍN,INÉS; DURRUTY,PILAR; LOBOS,SERGIO; SEELENFREUND,DANIELA.
Diabetic nephropathy (DN) is one of the major complications of type 2 diabetes and is associated with coronary disease. Nephrin, a protein mainly expressed in glomeruli, is decreased in DN and other kidney diseases. Since insulin levels are misregulated in type 2 diabetes, a possible connection between DN and its decreased nephrin expression could be the presence of regulatory elements responsive to insulin in the nephrin gene (NPHS1) promoter region. In this work, using bioinformatic tools, we identified a purine-rich GAGA element in the nephrin gene promoter and conducted a genomic study in search of the presence of polymorphisms in this element and its possible association with DN in type 2 diabetic patients. We amplified and sequenced a 514 bp promoter...
Tipo: Journal article
Palavras-chave: GAGA box; Gene promoter; Nephrin; Polymorphism.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000400010

A possible role of Drosophila CTCF in mitotic bookmarking and maintaining chromatin domains during the cell cycle
Provedor de dados: 48
Autores: Shen,Wenlong; Wang,Dong; Ye,Bingyu; Shi,Minglei; Zhang,Yan; Zhao,Zhihu.
BACKGROUND: The CCCTC-binding factor (CTCF) is a highly conserved insulator protein that plays various roles in many cellular processes. CTCF is one of the main architecture proteins in higher eukaryotes, and in combination with other architecture proteins and regulators, also shapes the three-dimensional organization of a genome. Experiments show CTCF partially remains associated with chromatin during mitosis. However, the role of CTCF in the maintenance and propagation of genome architectures throughout the cell cycle remains elusive. RESULTS: We performed a comprehensive bioinformatics analysis on public datasets of Drosophila CTCF (dCTCF). We characterized dCTCF-binding sites according to their occupancy status during the cell cycle, and identified...
Tipo: Journal article
Palavras-chave: DCTCF; Cell cycle; Chromatin domains; Mitotic bookmarking; Bioinformatics.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100027

A potential nutritional modifier for predicting primary productivity of Pinus radiata in New Zealand using a simplified radiation-use efficiency model
Provedor de dados: 118
Autores: Bown,Horacio E; Mason,Euan G; Watt,Michael S; Clinton,Peter W.
H.E. Bown, E.G. Mason, M.S. Watt, and P.W. Clinton. 2013. A potential nutritional modifier for predicting primary productivity of Pinus radiata in New Zealand using a simplified radiation-use efficiency model. Cien. Inv. Agr. 40(2): 361-374. The 3-PG (Physiological Principles in Predicting Growth) radiation-use efficiency model has been widely used and tested for predicting the primary productivity of forests all over the world. This radiation-use efficiency model accounts for plant nutrition through a user-defined dimensionless fertility parameter (fN) that determines the effects a unit of radiation. Currently, this fertility parameter has to be entered by the user based on intuition or experience. The goal of this study was to propose a fertility...
Tipo: Journal article
Palavras-chave: Nutritional modifier; Pinus radiata; Primary productivity; Radiation-use efficiency; Soil C/N; Soil N.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200011

A practical approach to the understanding and teaching of RNA silencing in plants
Provedor de dados: 69
Autores: Bazzini,Ariel A; Mongelli,Vanesa C; Hopp,H. Esteban; del Vas,Mariana; Asurmendi,Sebastián.
Gene silencing, also called RNA interference (RNAi) is a specific mechanism of RNA degradation involved in gene regulation, development and defense in eukaryotic organisms. It became an important subject in the teaching programs of molecular biology, genetics and biotechnology courses in the last years. The aim of this work is to provide simple and inexpensive assays to understand and teach gene silencing using plants as model systems. The use of transient and permanent transgenic plants for expressing reporter genes, like those derived from jellyfish green fluorescent protein (gfp) encoding gene, provides a nice, colorful and conclusive image of gene silencing. Three experimental approaches to evidence RNA silencing are depicted. In the first approach...
Tipo: Journal article
Palavras-chave: Gene silencing; GFP; HC-Pro; PDS; Protocols; PTGS; Teaching; Transgenic; Transient expression; TRV; VIGS.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200002

A predicted structure of the cytochrome c oxidase from Burkholderia pseudomallei
Provedor de dados: 69
Autores: Mohd. Raih,Mohd. Firdaus; Sailan,Ahmad Tarmidi; Zamrod,Zulkeflie; Embi,Mohd. Noor; Mohamed,Rahmah.
Cytochrome c oxidase, the terminal enzyme of the respiratory chains of mitochondria and aerobic bacteria, catalyzes electron transfer from cytochrome c to molecular oxygen. The enzyme belongs to the haem-copper-containing oxidases superfamily. A recombinant plasmid carrying a 2.0 kb insert from a Burkholderia pseudomallei genomic library was subjected to automated DNA sequencing utilizing a primer walking strategy. Analysis of the 2002 bp insert revealed a 1536 bp open reading frame predicted to encode a putative cytochrome c oxidase. Further analysis using sequence alignments and tertiary structure analysis tools demonstrated that the hypothetical B. pseudomallei cytochrome c oxidase is similar to cytochrome c oxidases from other organisms such as Thermus...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100005

A preferable approach to clone hLIF cDNA from the genomic DNA
Provedor de dados: 69
Autores: Cui,Yihong; Zhu,Guangqin; Chen,Qiuju; Wang,Yunfei; Yang,Mingming; Song,Yuxuan; Wang,Jiangang; Cao,Binyun.
Complementary DNA (cDNA) is valuable for investigating protein structure and function in the research of life science, but it is difficult to obtain by traditional reverse transcription. In this study, we employed a novel strategy to clone the human leukemia inhibitory factor (hLIF) gene cDNA from genomic DNA directly isolated from the mucous membrane of mouth. The hLIF sequence can be acquired within a few hours by means of amplification of each exon and splicing using overlap-PCR. Thus, the new approach developed in this study is simple, time- and cost-effective, and it is not limited to particular gene expression levels of each tissue.
Tipo: Journal article
Palavras-chave: CDNA cloning; HLIF; Oral mucous membrane; Overlap PCR.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300012

A Pyranine based Procedure for Evaluation of the Total Antioxidant Potential (TRAP) of Polyphenols: A Comparison with closely related Methodologies
Provedor de dados: 48
Autores: CAMPOS,ANA MARÍA; SOTOMAYOR,CARLOS PATRICIO; PINO,EDUARDO; LISSI,EDUARDO.
A novel procedure for the evaluation of total reactive antioxidant potentials (TRAP) is described. The method is based on the measurement of the bleaching of pyranine by peroxyl radicals. The addition of the antioxidants produces a clear induction time whose magnitude is directly related to the antioxidant concentration. A comparison of the values obtained with those reported employing closely related methodologies shows that the results are significantly affected by the substrate employed to monitor the steady state free radical concentration. Possible sources of this dependence are discussed
Tipo: Journal article
Palavras-chave: Peroxyl radicals; Polyphenols; Pyranine; Total reactive antioxidant potential.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200015

A quantitative analysis of forest fragmentation in Los Tuxtlas, southeast Mexico: patterns and implications for conservation
Provedor de dados: 97
Autores: MENDOZA,EDUARDO; FAY,JOHN; DIRZO,RODOLFO.
Habitat loss is a critical threat to tropical biodiversity and its quantification constitutes a central conservation issue. Typically, assessments have been based on deforestation rates statistics. However, this overlooks the effects brought about by the spatial reconfiguration of the remaining habitat: fragmentation. We present an analysis of fragmentation in a Neotropical site aimed at: (a) devising a protocol for its quantification, (b) using such protocol to provide insights on the ecological consequences of fragmentation, (c) exploring its applicability to address the hypothesis that forest size-inequality decreases with elevation, an indicator of habitat accessibility. We applied the Gini coefficient (G) and the Lorenz curve to analyze fragment-size...
Tipo: Journal article
Palavras-chave: Edge effect; Fragment shape; Gini coefficient; Lorenz curve; Tropical rain forest.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000300008

A Quantitative Assessment of the Morphological Characteristics of BeWo Cells as an in vitro Model of Human Trophoblast Cells
Provedor de dados: 77
Autores: Abaidoo,C.S; Warren,M. A; Andrews,P. W; Boateng,K. A.
In order to study the detailed morphology of trophoblast cells during human implantation, BeWo cells were cultured as spheroids in suspension culture. These cultures were then processed for light and electron microscopical examination. The present study showed that the BeWo spheroids consist of two cell types which are cytotrophoblast-like and syncytiotrophoblast-like. The cells with larger nuclear diameter made up only about 1% of the cell population and appear to be those of syncytiotrophoblast. Therefore the predominant cell type of the BeWo spheroids appeared to be relatively undifferentiated and cytotrophoblast-like. About 10% of the BeWo cells in the present study were mitotic, indicating a highly proliferative population. Total cell number increased...
Tipo: Journal article
Palavras-chave: BeWo; Trophoblast; Morphometry; Spheroids.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400011

A quantitative PCR approach for determining the ribosomal DNA copy number in the genome of Agave tequila Weber
Provedor de dados: 69
Autores: Rubio-Piña,Jorge; Quiroz-Moreno,Adriana; Sánchez-Teyer,L. Felipe.
Background: Agave tequilana has a great economic importance in Mexico in order to produce alcoholic beverages and bioenergy. However, in this species the structure and organization of the rDNAs in the genome are limited, and it represents an obstacle both in their genetic research and improvement as well. rDNA copy number variations per eukaryotic genome have been considered as a source of genetic rearrangements. In this study, the copy number of 18S and 5S rDNAs in the A. tequilana genome was estimated, and an absolute quantitative qPCR assay and genome size was used. In addition, an association between the rDNAs copy number and physical mapping was performed to confirm our results. Results: The analysis were successfully applied to determine copy number...
Tipo: Journal article
Palavras-chave: Agave tequilana; Copy number; Fluorescent in situ hybridization; Ribosomal DNA; Quantitative PCR.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400002

A radiographic method to estimate lung volume and its use in small mammals
Provedor de dados: 48
Autores: CANALS,MAURICIO; OLIVARES,RICARDO; ROSENMANN,Mario.
In this paper we develop a method to estimate lung volume using chest x-rays of small mammals. We applied this method to assess the lung volume of several rodents. We showed that a good estimator of the lung volume is: V*L = 0.496 · V RX &amp;#8776; 1/2·V RX , where V RX is a measurement obtained from the x-ray that represents the volume of a rectangular box containing the lungs and mediastinum organs. The proposed formula may be interpreted as the volume of an ellipsoid formed by both lungs joined at their bases. When that relationship was used to estimate lung volume, values similar to those expected from allometric relationship were found in four rodents. In two others, M. musculus and R. norvegicus, lung volume was similar to reported data, although...
Tipo: Journal article
Palavras-chave: Lung volume; X-ray; Method; Rodents.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000100006

A Radiological Investigation on the Hand Development in Human Fetuses Throughout the Fetal Period and an Evaluation Performed in Terms of its Clinical Importance Hand Development
Provedor de dados: 77
Autores: Raziye,Desdicioglu; Ceren,Uguz; Kadir,Desdicioglu; Osman,Sulak; Mehmed Ali,Malas.
It was aimed in this study that the morphometric development of the hand in human fetuses throughout the fetal period be radiologically investigated and the clinical importance of this period be evaluated. A total of 50 fetuses with no external pathology or anomaly, and the ages of which varied between 20-40 gestational weeks were incorporated into the study. The fetuses were separated into groups according to gestational weeks, trimesters and months. After the general external measurements of the fetuses were performed, mammography and hand radiographies of the fetuses were shot in the way that their hands would be in a pronational position. Afterwards, the morphometric measurements of the hands were performed with the help of a digital caliper through...
Tipo: Journal article
Palavras-chave: Fetus; Hand; Fetal development; Morphometry; Radiology.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400057

A Rainfall Simulator for the in situ Study of Superficial Runoff and Soil Erosion
Provedor de dados: 117
Autores: Sangüesa,Claudia; Arumí,José; Pizarro,Roberto; Link,Oscar.
A rainfall simulator is an important tool for the study of runoff generation and soil loss because it can be used either under laboratory conditions, or in disturbed or natural soil. The objective of this study was to describe the design and operation of a rainfall simulator to evaluate soil loss in situ. The rainfall simulator has four full-cone spray nozzles with a Unijet system mounted in a straight line pipe configuration, and easily transported and assembled. Simulated rainfall uniformity was evaluated in the laboratory, whereas the applicability of the simulator in natural soil erosion plot conditions in an experimental field with different slopes was tested by quantifying runoff and evaluating soil erosion. Twenty simulations were carried out in the...
Tipo: Journal article
Palavras-chave: Soil erosion; Superficial runoff; Erosion plot; Uniformity of rain.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100019

A raíz del Año Internacional de la Diversidad Biológica
Provedor de dados: 72
Autores: D'Elía,Guillermo.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100002

A rapid and cheap protocol for preparation of PCR templates in peanut
Provedor de dados: 69
Autores: Wang,Chuan Tang; Wang,Xiu Zhen; Tang,Yue Yi; Zhang,Jian Cheng; Yu,Shan Lin; Xu,Jian Zhi; Bao,Zhen Min.
This paper describes a simple, low cost and reliable DNA template preparation protocol for polymerase chain reaction (PCR) using immature leaves from peanut seeds or leaves from field-grown plants. The technique may find wide utility in studies involving PCR-based molecular markers, rapid screening for transformants and gene cloning.
Tipo: Journal article
Palavras-chave: DNA extraction; Groundnut; PCR; Peanut.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200009

A Rapid and Efficient Method for Purifying High Quality Total RNA from Peaches (Prunus persica) for Functional Genomics Analyses
Provedor de dados: 48
Autores: MEISEL,LEE; FONSECA,BEATRIZ; GONZÁLEZ,SUSANA; BAEZA-YATES,RICARDO; CAMBIAZO,VERONICA; CAMPOS,REINALDO; GONZALEZ,MAURICIO; ORELLANA,ARIEL; RETAMALES,JULIO; SILVA,HERMAN.
Prunus persica has been proposed as a genomic model for deciduous trees and the Rosaceae family. Optimized protocols for RNA isolation are necessary to further advance studies in this model species such that functional genomics analyses may be performed. Here we present an optimized protocol to rapidly and efficiently purify high quality total RNA from peach fruits (Prunus persica). Isolating high-quality RNA from fruit tissue is often difficult due to large quantities of polysaccharides and polyphenolic compounds that accumulate in this tissue and co-purify with the RNA. Here we demonstrate that a modified version of the method used to isolate RNA from pine trees and the woody plant Cinnamomun tenuipilum is ideal for isolating high quality RNA from the...
Tipo: Journal article
Palavras-chave: CDNA library; Fruit; Fruit trees; Functional genomics; Peach; Polysaccharides; Prunus persica; RNA isolation; Rosaceae; RT-PCR.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000100010

A rapid method for an offline glycerol determination during microbial fermentation
Provedor de dados: 69
Autores: Kuhn,Jennifer; Müller,Hagen; Salzig,Denise; Czermak,Peter.
Background The purpose of this work was to find a rapid method for glycerol detection during microbial fermentations. The method requirements were, first, to avoid sample pretreatment, and second, to measure glycerol precisely especially out of fermentation broth. Results This was achieved by combining two reaction principles - the Malaprade reaction and the Hantzsch reaction. In the Malaprade reaction, glycerol is converted into formaldehyde. This forms a dye in the Hantzsch reaction after which adsorption is than detected. The subsequent assay was investigated with two different fermentation media, a chemically undefined and a chemically defined media, used for Pichia pastoris fermentation. In both media, as well as in real fermentation samples, glycerol...
Tipo: Journal article
Palavras-chave: Glycerol determination; Fermentation broth; Hantzsch reaction; Malaprade reaction.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300017

A rare but successful reproductive tactic in a social wasp (Hymenoptera:Vespidae): Use of heterospecific nests
Provedor de dados: 97
Autores: DE SOUZA,ANDRÉ R.; SILVA,NEWTON J. J.; PREZOTO,FÁBIO.
Successful heterospecific use of abandoned nests has been reported in birds. Although the same behavior has been observed in wasps, the success of such tactic has not been demonstrated. We described two cases in which the social wasp Polistes versicolor successfully reared its brood in empty nests of the social wasps Mischocyttarus drewseni and Mischocyttarus cassununga (Hymenoptera: Vespidae). We showed that this is a rare but a viable reproductive tactic for both solitary and associative foundress. Unlike birds, which use heterspecific nests very similar to their own, wasps are able to use heterspecific nests that do differ from their own.
Tipo: Journal article
Palavras-chave: Mischocyttarus cassununga; Mischocyttarus drewseni; Polistes versicolor.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000300010

A Rare Case of Unilateral Third Head of Sternocleidomastoid Muscle
Provedor de dados: 77
Autores: Cherian,Saju Binu; Nayak,Satheesha.
A rare case of unilateral third head of sternocleidomastoid muscle was noted during routine dissections for undergraduate medical students. The additional third head originated from the middle third of the clavicle and joined the normal two heads (sternal and clavicular) of the muscle in the middle of the neck. The insertion and nerve supply of the muscle was normal. This case may be important for head and neck surgeons and for plastic surgeons doing muscle graft surgeries.
Tipo: Journal article
Palavras-chave: Sternocleidomastoid muscle; Anatomical variation; Neck muscle.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100017

A Rare Lymphatico-Venous Communication Associated with Duplication of Thoracic Duct
Provedor de dados: 77
Autores: Anu,Vinod Ranade; Rajalakshmi,Rai; Latha,Venkatraya Prabhu; Mangala,Kumaran.
An unusual presentation of the duplication of thoracic duct with a rare lymphatico- venous communication was found during the routine dissection for undergraduate students. The thoracic duct duplicated at the level of T12 vertebra. Normally thoracic duct opens into the junction of left internal jugular vein and subclavian vein. On the right side of the neck, the right lymphatic duct conveys the lymph from the head and neck, the upper extremity and the right side of the thorax to the right innominate vein. Here, the duplicated thoracic duct on the left side opened directly into the inferior vena cava. The above case is discussed with regard to its development, incidence, and clinical significance
Tipo: Journal article
Palavras-chave: Thoracic duct; Inferior vena cava; Lymphatico-venous communications; Cisterna chyli; Lymphatic duct.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300005

A Rare Pattern of Brachial Artery Variation: Case Report
Provedor de dados: 77
Autores: Jacomo,A. L; Martinez,C. A. R; Saleh,S. O; Andrade,M; Akamatsu,F. E.
Unlike the venous system, variations in arterial anatomy are less frequent and most of them affect visceral arteries. In limbs, variations of the brachial artery are the most reported and at least six different patterns have been described so far. The commonest is the superficial brachial artery which lies superficially to the median nerve. Much less prevalent are the high origin of the radial artery (brachioradial artery) or the existence of a doubled brachial artery (accessory brachial artery). We present a previously undescribed pattern of brachial artery variation. During dissection of the right upper limb of a 60 year-old male embalmed cadaver, we found the bifurcation of the brachial artery in the proximal portion of the middle third of the arm. Its...
Tipo: Journal article
Palavras-chave: Artery; Brachial; Variation; Anatomy.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200027

A Rare Termination of Left Common Facial Vein into Left Subclavian Vein: A Case Report
Provedor de dados: 77
Autores: Prakash,Babu B; Bhagath,Kumar Potu.
During routine dissection of head and neck, an unusual drainage in pattern of the veins on the left side of the face was observed in an adult male cadaver. In the present case, he superficial temporal vein united with maxillary vein to form retromandibular vein within the substance of the left parotid gland. The anterior division of retromandibular vein joined with facial vein to form common facial vein that drained into left subclavian vein directly. Knowledge of such variations is important for surgeons performing head and neck surgeries. Facial veins are often grafted into carotid endarterectomy
Tipo: Journal article
Palavras-chave: Facial vein; Retromandibular vein; Anatomical Variation; Carotid endarterectomy.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300013

A Rare Variation of the Retro-Aortic Left Renal Vein with Anastomotic Afluent from Inferior Mesenteric Vein
Provedor de dados: 77
Autores: Andrade,F. M.; Rocha,R. P.; Pereira,H. M.; Fernandes,R. M. P.; Babinski,M. A.
We report an uncommon anatomical variations of the left renal vein was found on dissected specimen in an elderly male cadaver: a retroaortic left renal vein. No other vascular anomalies were noted in this specimen. The anomaly result may be related to a particular pattern of left inferior vena cava. The abnormality have to be known for it may be undetected or be misleading in imaging. This anatomical curiosity should be kept in mind by clinicians and academics that may manipulate this anatomical area
Tipo: Journal article
Palavras-chave: Anatomy; Anomalies; Kidney; Retroaortic renal vein.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000100001

A Rare Variation of the Testicular Blood Supply by the Deferential Artery
Provedor de dados: 77
Autores: Zheng,Yong; Yuan,Qianqian; He,Xin; Lei,Yueshan.
Any compression of testicular arteries may lead to loss of spermatogenesis and gonadal hormone production, existence of the variational arteries is accountable in cases of vasoligation, orchidopexy and other surgical approach on them. Anomalies of the testicular blood arteries were observed during dissection of the pelvic cavity in a 68-year-old male cadaver. This report describes a very rare case of lack of testicular arteries. For the blood supply to the testis, thick deferential arteries form some vascular winding and loops and course accompanied by deferent duct to the testis. This case report would serve as ray of light for knowledge of the possible variations of the testicular arteries during surgical procedures.
Tipo: Journal article
Palavras-chave: Deferential artery; Variation; Umbilical artery.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300022

A real-time PCR genotyping assay to detect FAD2A SNPs in peanuts (Arachis hypogaea L.)
Provedor de dados: 69
Autores: Barkley,Noelle A; Wang,Ming Li; Pittman,Roy N.
The high oleic (C18:1) phenotype in peanuts has been previously demonstrated to result from a homozygous recessive genotype (ol1ol1ol2ol2) in two homeologous fatty acid desaturase genes (FAD2A and FAD2B) with two key SNPs. These mutant SNPs, specifically G448A in FAD2A and 442insA in FAD2B, significantly limit the normal function of the desaturase enzyme activity which converts oleic acid into linoleic acid by the addition of a second double bond in the hydrocarbon chain. Previously, a genotyping assay was developed to detect wild type and mutant alleles in FAD2B. A real-time PCR assay has now been developed to detect wild type and mutant alleles (G448A) in FAD2A using either seed or leaf tissue. This assay was demonstrated to be applicable for the...
Tipo: Journal article
Palavras-chave: Fatty acid composition; Gas chromatography; Peanut (Arachis hypogaea L.); Real-time PCR; SNP genotyping.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100009

A reassessment of the phytogeographic characterization of Temperate Pacific South America
Provedor de dados: 97
Autores: SANTELICES,BERNABE; MENESES,ISABEL.
In 1980, a study of geographic distribution patterns and geographic affinities of benthic algae of temperate Pacific South America (5-55 ºS) provided a first characterization of these coasts. High endemism and limited floristic exchange with the Tropical Pacific and with islands in the South Pacific at various distances from the continent were two outstanding features of the marine flora. A partial blockage of species exchange partially accounted for a peculiar latitudinal pattern of species richness that increases with increasing latitudes. In contrast, there was reduced species richness in comparison with other climatically equivalent regions that have contact with more effective routes of migration. Over the last two decades, more than 30 taxonomic and...
Tipo: Journal article
Palavras-chave: Benthic phytogeography; Isolation; Latitudinal patterns; Seaweeds; Temperate South America.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400005

A Research of Peripheral Blood Cells Annually in Bufo Bufo gargarizans
Provedor de dados: 77
Autores: Liu,Chongbin; Xia,Chengqiang; Xie,Zhaohui; Jiao,Yang; She,Qiusheng.
The present paper deals with a histological study of the blood cells of Bufo Bufo gargarizans in different months: January, March, May, July and October. The methods used are by routine blood smear in Wright stain and observation in vivo. We found that in smears and in vivo two main types of cells of the red cells: mitotic as well as amitotic. While amitotic occurs all the year round, particularly in July, mitosis so far had been seen only in July. It is also found that there are plenty of neutrophils in the blood cells of Bufo Bufo gargarizans, furthermore, the nuclei of these cells are polymorphic, especially in January and March. Meanwhile, the concentration of red cells was lowest in May and highest in January; The concentration of white blood cells...
Tipo: Journal article
Palavras-chave: Bufo Bufo gargarizans; Blood cells; Annual changes.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400022

A review of the chemistries of redox sensitive elements within suboxic zones of oxygen minimun regions
Provedor de dados: 72
Autores: Kenneth W,Bruland.
This presentation is a review of the chemistries of redox sensitive elements within suboxic regions of extreme oxygen minimum zones. Suboxic regions are defined as extreme oxygen minimum zones with dissolved oxygen &lt; 10 µmol kg-1 (and likely &lt;5 µmol kg-1), and with clear evidence of nitrate reduction, but not sulfate reduction. These are regions with nitrate deficits &gt; 10 µmol kg-1 or N* values of _10 µmol kg-1. Suboxic regions predictably occur in the tropical and subtropical eastern Pacific and the Arabian Sea. These suboxic zones are important in the global biogeochemistry of nitrogen and act as an important sink for fixed nitrogen. Minor and trace element redox couples such as iodate/iodide and leachable particulate Mn/dissolved Mn undergo...
Tipo: Journal article
Palavras-chave: Nitrate; Iodine; Manganese; Iron.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300003

A review on plant importance, biotechnological aspects, and cultivation challenges of jojoba plant
Provedor de dados: 48
Autores: Al-Obaidi,Jameel R.; Halabi,Mohammed Farouq; AlKhalifah,Nasser S.; Asanar,Shanavaskhan; Al-Soqeer,Abdulrahman A.; Attia,M. F.
Abstract Jojoba is considered a promising oil crop and is cultivated for diverse purposes in many countries. The jojoba seed produces unique high-quality oil with a wide range of applications such as medical and industrial-related products. The plant also has potential value in combatting desertification and land degradation in dry and semi-dry areas. Although the plant is known for its high-temperature and high-salinity tolerance growth ability, issues such as its male-biased ratio, relatively late flowering and seed production time hamper the cultivation of this plant. The development of efficient biotechnological platforms for better cultivation and an improved production cycle is a necessity for farmers cultivating the plant. In the last 20 years, many...
Tipo: Journal article
Palavras-chave: Simmondsia chinensis; Oil crop; Combat desertification; Desert plants.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100503

A Review on the Celiac Trunk Compression Syndrome: Some Anatomic Clinical-Surgical Aspects
Provedor de dados: 77
Autores: Petrella,Selma; Prates,José Carlos.
The objective of this study was to review some celiac trunk compression syndrome aspects such as: symptom-posture relationship; absence of symptoms; syndrome-age relationship; angiographic study on anatomy of the celiac trunk stenosis; congenital or acquired origin; invasive diagnostic tests; surgical and postoperative results.
Tipo: Journal article
Palavras-chave: Arterial occlusive disease; Celiac artery; Celiac plexus; Diaphragm; Syndrome.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200008

A Ricardian Analysis of the Impact of Climate Change on South American Farms
Provedor de dados: 117
Autores: Niggol Seo,S; Mendelsohn,Robert.
This study estimates the impact of climate change on South American agriculture taking into account farm adaptations. The study used a Ricardian analysis of 2300 farms to explore the effects of global warming on land values. In order to predict climate change impacts for this century, were examined climate change scenarios predicted by three Atmospheric Oceanic General Circulation Models (AOGCM): the Canadian Climate Center (CCC), the Centre for Climate System Research (CCSR), and the Parallel Climate Model (PCM) models. Several econometric specifications were tested, and five separate regressions were run: for all farms, small household farms, large commercial farms, rainfed farms, and irrigated farms. Farmland values will decrease as temperature...
Tipo: Journal article
Palavras-chave: Climate change; Agriculture; Ricardian approach; South America.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100007

A roadmap to directed enzyme evolution and screening systems for biotechnological applications
Provedor de dados: 48
Autores: Martínez,Ronny; Schwaneberg,Ulrich.
Enzymes have been long used in man-made biochemical processes, from brewing and fermentation to current industrial production of fine chemicals. The ever-growing demand for enzymes in increasingly specific applications requires tailoring naturally occurring enzymes to the non-natural conditions found in industrial processes. Relationships between enzyme sequence, structure and activity are far from understood, thus hindering the capacity to design tailored biocatalysts. In the field of protein engineering, directed enzyme evolution is a powerful algorithm to generate and identify novel and improved enzymes through iterative rounds of mutagenesis and screening applying a specific evolutive pressure. In practice, critical checkpoints in directed evolution...
Tipo: Journal article
Palavras-chave: Directed evolution; Enzyme engineering; High throughput screening; Random mutagenesis.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400011

A robust HIV-1 viral load detection assay optimized for Indian sub type C specific strains and resource limiting setting
Provedor de dados: 48
Autores: Acharya,Arpan; Vaniawala,Salil; Shah,Parth; Parekh,Harsh; Misra,Rabindra Nath; Wani,Minal; Mukhopadhyaya,Pratap N.
BACKGROUND: Human Immunodeficiency Virus Type 1 (HIV-1) viral load testing at regular intervals is an integral component of disease management in Acquired Immunodeficiency Syndrome (AIDS) patients. The need in countries like India is therefore an assay that is not only economical but efficient and highly specific for HIV-1 sub type C virus. This study reports a SYBR Green-based HIV-1 real time PCR assay for viral load testing and is designed for enhanced specificity towards HIV-1 sub type C viruses prevalent in India. RESULTS: Linear regression of the observed and reference concentration of standards used in this study generated a correlation coefficient of 0.998 (p&amp;#8201;&lt;&amp;#8201;0.001). Lower limit of detection of the test protocol was 50...
Tipo: Journal article
Palavras-chave: HIV-1; Gag; SYBR Green; RT PCR.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100022

A Scanning Electron Microscopic Study on the Appendage Morphology of Astacus leptodactylus (Eschscholtz, 1823) and Pacifastacus leniusculus (Daña, 1852) (Crustácea:Decapoda: Astacoidea)
Provedor de dados: 77
Autores: Mustafa Harlioglu,Muzaffer.
This study compares the morphology of rostrum, pereipods 1,2,4 and mouthparts of juvenile Astacus leptodactylus with those oí Pacifastacus leniusculus. Differences in morphology were observed, in particular with regard to the mouthparts e.g. including setal armature and number of teeth on the mandible. In general, the shape of the rostra in the two species is similar in that both taper to a point with a pair of sharp spines distally. Laterally the rostrum of A. leptodactylus is bordered by a regular row of setae, which is not so well defined in P leniusculus. The observations also showed that in addition to an increase in size, changes in morphology in the feeding apparatus between the developmental stages of the two species were present. It was concluded...
Tipo: Journal article
Palavras-chave: Appendages; Astacus; Crayfish; Mouthparts; Pacifastacus; Scanning electrón microscope.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400040

A scenario for the conversion of Common Agricultural Policy payments in Spain after the 2011 legislative proposals
Provedor de dados: 118
Autores: Andrés,Silvia; García,José M; Compés,Raúl.
S. Andrés, J.M. García, and R. Compés. 2013. A scenario for the conversion of Common Agricultural Policy payments in Spain after the 2011 legislative proposals. Cien. Inv. Agr. 40(2):291-306. This paper evaluates the impact of a new model of agricultural policy outlined in legislative proposals issued by the European Commission in October 2011 and estimates its effects on agricultural aid in Spanish Autonomous Communities compared with 2009. Therefore, the OECD agricultural policy-index system was used. To the extent that transversal criteria are applied, which support the transfer of aid between territories, the results suggest that changing the payment assignation model would involve a redistribution of aid towards areas that currently least benefit from...
Tipo: Journal article
Palavras-chave: Agricultural policy; CAP post-2013; Direct payments; OECD; Redistribution.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200005

A Scientometric view of some Biological disciplines in Chile
Provedor de dados: 48
Autores: KRAUSKOPF,MANUEL.
During the last decade the articles published by Chilean Research Centers grew 1,73 which compares to the 2.34 fold increase of mainstream research articles registered as a whole in Latin America. However, the relative impact of the Chilean publications surpassed that of Latin America. In Biological Sciences, traditionally the strongest research area within Chile, Latin America also shows a steeper slope of growth. Qualitatively, biological disciplines in Chile are comparable to those published in Latin America although in Chile there are specialties as Physiology that surpass the average world's impact. The scientometric data is consistent with the fall in individual grants that the Chilean Research Fund (FONDECYT) has been allocating during the last...
Tipo: Journal article
Palavras-chave: Research output; Biological sciences; Chile; Latin America; Scientometric analyses.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000100012

A SEARCH FOR CORRELATIONS BETWEEN SEA SURFACE TEMPERATURES AND OPTICAL REFLECTANCES IN CHILE AND BRAZIL DERIVED FROM AVHRR/NOAA IMAGES
Provedor de dados: 72
Autores: Gusso,Aníbal; Ducati,Jorge Ricardo; Cotlier,Carlos G; Lopez,Diego A. G.
A search is made for indicators of the presence of phytoplankton, using satellite images of the Pacific (Central Chile) and Atlantic (South Brazil). AVHRR/NOAA-16 and -17 visible (1 and 2) and thermal (4 and 5) channels were used to perform a detection test, respectively, the Suspended Particulate Matter (SPM) and the Sea Surface Temperature (SST). In Brazilian waters, a positive correlation is found between SST and SPM's reflectance. This is interpreted as due to phytoplankton being more abundant in colder waters, where nutrients availability are higher because CO2 dissolution rates, thus being a favorable environment for phytoplankton contents, which when mixed with SPM, tends to reduce the total water reflectance, since organic matter causes absorption...
Tipo: Journal article
Palavras-chave: Phytoplankton biomass; Remote sensing; AVHRR/NOAA.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200046

A segment and epithelium specific messenger ribonucleic acid fragment up-regulated by estradiol in the rat oviduct
Provedor de dados: 48
Autores: RIOS,MARIANA; OJEDA,SUANY; VELASQUEZ,LUIS A; MAISEY,KEVIN; CROXATTO,HORACIO B.
Estradiol accelerates oviductal embryo transport in the rat through changes of genomic expression in oviductal cells. However, the genes involved are unknown. We used a differential display by reverse transcription-polymerase chain reaction to detect estradiol (E2)-dependent genes in the rat oviduct. Rats on day 2 of pregnancy were untreated or treated with 10 µg of E2 and the oviducts were extracted at 30, 180 and 360 min later and used to isolate RNA. Products of reverse transcriptase-PCR, made with pairs of arbitrary and oligo-deoxythymidine primers, were separated on denaturing polyacrylamide gels and candidate bands were excised and reamplified. Truly positive cDNA fragments determined by a single strand conformation polymorphism assay were cloned and...
Tipo: Journal article
Palavras-chave: Differential display; Estradiol; Gene; MRNA; Oviduct.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000100011

A Segmental Hypoplastic Anterior Tibial Artery Coexisting with a Hypertrophied Perforating Fibular Artery a Case Report and Clinical Implications
Provedor de dados: 77
Autores: Ariyo,Olutayo.
Vascular injuries of the lower limb, especially from penetrating gunshot wounds, and peripheral arterial diseases are on the increase and management of these and many other lower limb injuries involve increasing usage of vascular interventions like by-pass surgery, per-cutaneous transluminal angioplasty, arterial cannulation, arterial bypass graft or minimally invasive measures like percutaneous trans-arterial catheterization, among others. A thorough knowledge of infrapopliteal branching most especially their pathways and luminal diameters are important to surgeons in selecting appropriate surgical interventions or procedures. We report the case in which one of the 3 terminal branches of the popliteal artery (PPA), the anterior tibial artery (ATA) of good...
Tipo: Journal article
Palavras-chave: Segmental hypoplastic anterior tibial artery; Attenuated dorsalis pedis artery; Hypertrophied fibular artery; Infrapopliteal branching.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100002

A semi-quantitative assay to screen for angiogenic compounds and compounds with angiogenic potential using the EA.hy926 endothelial cell line
Provedor de dados: 48
Autores: ARANDA,EVELYN; OWEN,GARETH I.
Angiogenesis, the development of new capillary vessels, has a host of clinical manifestations. The identification of agents that increase or decrease angiogenesis is of great pharmaceutical interest. Classically, in vitro angiogenesis utilizes human umbilical vein endothelial cells (HUVEC) grown in matrigel. This valid and simple method has the drawbacks that each cell population is distinct and the constraint of obtaining primary source material. Herein we utilize the established EA.hy926 endothelial cell line as our model for in vitro angiogenesis and present a novel formula to quantify endothelial cell remodeling to identify pro- and anti-angiogenic agents. Furthermore, our technique details the procedures to identify and quantify compounds that have...
Tipo: Journal article
Palavras-chave: Angiogenesis; EA.hy926; HUVEC; Endothelial; Formula; In vitro assay; Matrigel.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300012

A simple and effective pressure culture system modified from a transwell cell culture system
Provedor de dados: 48
Autores: Sun,Xuerong; Liu,Xinguang; Zhang,Yuehong; Kuang,Xielan; Lv,Bo; Ge,Jian.
Mechanical pressure plays an important role in many physiological and pathological processes. Mimicking the mechanical pressure present in vitro is necessary for related research, but usually requires expensive and complicated equipment. In this study we created a simple pressure culture system based on the transwell culture system. By cutting off the top rim of the transwell insert, the cells were compressed between the insert membrane and the well floor. The new pressure culture system was proven effective in that it induced cell morphological change, integrin &amp;#946;1 upregulation, actin polymerization and growth change in rat retinal ganglion cells, human nasopharyngeal carcinoma cells and mice embryonic fibroblasts. Though the pressure value is...
Tipo: Journal article
Palavras-chave: Mechanical pressure; Cell culture; Transwell culture system; Cytoskeleton.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000100007

A simple and efficient method for extraction of Taq DNA polymerase
Provedor de dados: 69
Autores: Chen,Sique; Zheng,Xiujuan; Cao,Hongrui; Jiang,Linghui; Liu,Fangqian; Sun,Xinli.
Background Thermostable DNA polymerase (Taq Pol ?) from Thermus aquaticus has been widely used in PCR, which was usually extracted with Pluthero's method. The method used ammonium sulfate to precipitate the enzyme, and it saved effort and money but not time. Moreover, we found that 30-40% activity of Taq Pol I was lost at the ammonium sulfate precipitation step, and the product contained a small amount of DNA. Results We provided a novel, simplified and low-cost method to purify the Taq Pol ? after overproduction of the enzyme in Escherichia coli, which used ethanol instead of ammonium sulfate to precipitate the enzyme. The precipitate can be directly dissolved in the storage buffer without dialysis. In addition, DNA and RNA contamination was removed with...
Tipo: Journal article
Palavras-chave: Ethanol precipitation; PCR; Purification; Taq DNA polymerase.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500005

A simple and rapid identification method for newly emerged porcine Deltacoronavirus with loop-mediated isothermal amplification
Provedor de dados: 48
Autores: Zhang,Fanfan; Ye,Yu; Song,Deping; Guo,Nannan; Peng,Qi; Li,Anqi; Zhou,Xingrong; Chen,Yanjun; Zhang,Min; Huang,Dongyan; Tang,Yuxin.
Abstract  Background  Porcine Deltacoronavirus (PDCoV) is a newly emerged enteropathogenic coronavirus that causes diarrhea and mortality in neonatal piglets. PDCoV has spread to many countries around the world, leading to significant economic losses in the pork industry. Therefore, a rapid and sensitive method for detection of PDCoV in clinical samples is urgently needed.  Results  In this study, we developed a single-tube one-step reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay specific for nucleocapsid gene to diagnose and monitor PDCoV infections. The detection limit of RT-LAMP assay was 1 × 101 copies of PDCoV, which was approximately 100-fold more sensitive than gel-based one-step reverse transcription polymerase chain...
Tipo: Journal article
Palavras-chave: Porcine Deltacoronavirus (PDCoV); RT-LAMP; Rapid diagnosis.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100222

A simple ethanol wash of the tissue homogenates recovers high-quality genomic DNA from Corchorus species characterized by highly acidic and proteinaceous mucilages
Provedor de dados: 69
Autores: Kundu,Avijit; Sarkar,Debabrata; Bhattacharjee,Amit; Topdar,Niladri; Sinha,Mohit Kumar; Mahapatra,Bikash Sinha.
A simple miniprep based on early elimination of highly acidic and proteinaceous mucilages through ethanol washing of the tissue homogenates has been developed for the extraction of genomic DNA from mature leaves and seeds of Corchorus spp. As compared to high cetyltrimethylammonium bromide (CTAB)-NaCl DNA extraction followed by ethanol-based removal of remnant mucilages from the DNA pellet, this simple miniprep consistently and reproducibly recovers high amounts of DNA with good spectral qualities at A260/A280 and A260/A230. The purified DNA is efficiently digested by restriction endonucleases, and is suitable for PCR amplification of nuclear microsatellites with expected allele sizes.
Tipo: Journal article
Palavras-chave: Corchorus; DNA extraction; Microsatellite; Mucilage; PCR; Restriction digestion.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100010

A simple method for estimating suitable territory for bioenergy species in Chile
Provedor de dados: 118
Autores: Morales-Salinas,Luis; Acevedo,Edmundo; Castellaro,Giorgio; Román-Osorio,Luis; Morales-Inostroza,Jael; Alonso,Máximo F.
In the past 20 years, different areas of research concerning native and exotic species, herbaceous crops and forest plantations have been oriented toward satisfying domestic, industrial and transportation energy requirements. Because bioenergy species constitute an important resource, it would be strategic for a country to have a method for identifying areas suitable for their cultivation to properly incorporate the establishment of energy crops into land use planning. In this study, we sought to define the suitable territories for 16 bioenergy species and their energy potential based on their soil and climate requirements in Central and Southern Chile. We used an adapted version of the FAO EcoCrop database implemented through DIVA-GIS software to predict...
Tipo: Journal article
Palavras-chave: Bioenergy species; EcoCrop; Ecological niche model; Land suitability.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000200009

A simple method for isolation of genomic DNA from fresh and dry leaves of Terminalia arjuna (Roxb.) Wight and Arnot
Provedor de dados: 69
Autores: Deshmukh,Vishal P; Thakare,Prashant V; Chaudhari,Uddhav S; Gawande,Prashant A.
Current protocols for isolation of genomic DNA from Terminalia arjuna have their own limitations due to the presence of high content of gummy polysaccharides and polyphenols. DNA isolated by these protocols is contaminated with a yellowish, sticky and viscous matrix. In our modified DNA isolation method polysaccharides and polyphenols are removed prior to the precipitation of the DNA. Then the genomic DNA was precipitated using isopropanol. This protocol yielded a high molecular weight DNA isolated from fresh as well as dry leaves of T. arjuna, which was free from contamination and colour. Isolated DNA can be used for restriction digestion and PCR amplification. The main objective of the present protocol is to provide a simple method of isolation of DNA,...
Tipo: Journal article
Palavras-chave: Ayurveda; DNA extraction; Medicinal plant; Terminalia species.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300014

A simple negative selection method to identify adenovirus recombinants using colony PCR
Provedor de dados: 69
Autores: Zhao,Yongliang; Dong,Zongming; Li,Tengfei; Huang,Gang.
Background: The AdEasy system is a fast-track system for generating recombinant adenoviruses using the efficient homologous recombination machinery between shuttle and adenovirus backbone plasmids in Escherichia coli BJ5183 cells. The key step is homologous recombination in BJ5183 cells, which is driven by RecA activity. However, culture time is stringently limited to reduce the damage to recombinant plasmids by RecA activity. Therefore, rapid identification of recombinant adenoviruses within the limited time-period is critical. Results: We developed a simple negative selection method to identify recombinant adenoviruses using colony PCR, which improves the efficiency of adenovirus recombination screening and packaging. Conclusions: The negative selection...
Tipo: Journal article
Palavras-chave: Adenovirus; AdEasy; Colony PCR; Homologous recombination; RecA.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100008

A Simulation Model of Mesophytic Perennial Grasslands
Provedor de dados: 117
Autores: Castellaro G,Giorgio; Aguilar G,Claudio; Vera I,Raul; Morales S,Luis.
Grasslands are complex ecosystems and their processes are affected by soil, meteorological, and management variables. In this context, dynamic simulation models are useful to understand these processes and to design grassland use strategies. The aim of this study was to develop and validate a simulation model of perennial pasture growth based on soil and climate variables. A first approach considered that soil fertility levels were adequate; therefore, soil water availability and phytomass level were the main variables affecting pasture growth. The subroutines considered were water balance, pasture growth, and root biomass dynamics. The hypotheses regarding the functioning of the system were formulated as a group of equations which were solved numerically...
Tipo: Journal article
Palavras-chave: Grassland simulation models; Mesophytic grasslands.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300013

A Single High Dose of Chlorpyrifos Reduces Long-Term Basal C-Fos Expression in the Rat Arcuate Hypothalamic Nucleus
Provedor de dados: 77
Autores: Carvajal,F; Lerma-Cabrera,J. M; Sánchez-Amate,M. C; Cubero,I.
Chlorpyrifos (CPF) is an organophosphate compound used worldwide as a pesticide in agriculture that, after subcutaneous injection, keeps acetylcholinesterase (AChE) activity inhibited within an organism for months. Ample clinical and experimental evidence shows that CPF exposure induces relevant and persistent neurobehavioral deficits in humans and animals, even after one single episode/injection. Additionally, clinical and epidemiological studies evidence that a significant percentage (60%) of Gulf War veterans as well as agricultural workers suffering from acute OP intoxication may have developed intolerance to nicotine and ethanol-containing beverages. Consistent with it, administration of a single high dose of CPF to adult Wistar rats elicited...
Tipo: Journal article
Palavras-chave: Chlorpyrifos; Organophosphates; C-fos expression; Arcuate hypothalamic nucleus; Ethanol consumption.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100015

A Singular Method to Compare Dental Radiographic Films Used to Study Maxillofacial Structures
Provedor de dados: 77
Autores: Watanabe,Plauto Christopher Aranha; Issa,Joao Paulo Mardegan; Pardini,Luiz Carlos; Monteiro,Solange Aparecida Caldeira; Catirse,Alma Blásida Concepción Elizaur Benitez.
The aim of this article is to present a singular and practical method to compare roentgenograms, concerning optical density and contrast. This method is specifically indicated for research related to stepwedge penetrometer and photodensitometer
Tipo: Journal article
Palavras-chave: Dental radiographic films; Radiographic density; Radiographic contrast.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300017

A snapshot of cancer in Chile: analytical frameworks for developing a cancer policy
Provedor de dados: 48
Autores: la Jara,Jorge Jimenez de; Bastias,Gabriel; Ferreccio,Catterina; Moscoso,Cristian; Sagues,Sofia; Cid,Camilo; Bronstein,Eduardo; Herrera,Cristian; Nervi,Bruno; Corvalan,Alejandro; Velasquez,Ethel V; Gonzalez,Pamela; Castellon,Enrique; Bustamante,Eva; Oñate,Sergio; McNerney,Eileen; Sullivan,Richard; Owen,Gareth I.
INTRODUCTION: The South American country Chile now boasts a life expectancy of over 80 years. As a consequence, Chile now faces the increasing social and economic burden of cancer and must implement political policy to deliver equitable cancer care. Hindering the development of a national cancer policy is the lack of comprehensive analysis of cancer infrastructure and economic impact. OBJECTIVES: Evaluate existing cancer policy, the extent of national investigation and the socio-economic impact of cancer to deliver guidelines for the framing of an equitable national cancer policy. METHODS: Burden, research and care-policy systems were assessed by triangulating objective system metrics -epidemiological, economic, etc. - with political and policy analysis....
Tipo: Journal article
Palavras-chave: Chile; Cancer policy; Investigation; Research and development; Statistics; Gallbladder cancer; Stomach cancer; Developing country.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100010

A special issue devoted to STEM CELLS
Provedor de dados: 48
Autores: Santos,Manuel J; Ojeda,Patricio.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000300001

A spleen tyrosine kinase inhibitor attenuates the proliferation and migration of vascular smooth muscle cells
Provedor de dados: 48
Autores: Seo,Hyang&amp;#8209;Hee; Kim,Sang Woo; Lee,Chang Youn; Lim,Kyu Hee; Lee,Jiyun; Choi,Eunhyun; Lim,Soyeon; Lee,Seahyoung; Hwang,Ki&amp;#8209;Chul.
Abstract  Background  Pathologic vascular smooth muscle cell (VSMC) proliferation and migration after vascular injury promotes the development of occlusive vascular disease. Therefore, an effective chemical agent to suppress aberrant proliferation and migration of VSMCs can be a potential therapeutic modality for occlusive vascular disease such as atherosclerosis and restenosis. To find an anti-proliferative chemical agent for VSMCs, we screened an in-house small molecule library, and the selected small molecule was further validated for its anti-proliferative effect on VSMCs using multiple approaches, such as cell proliferation assays, wound healing assays, transwell migration assays, and ex vivo aortic ring assay.  Results  Among 43 initially screened...
Tipo: Journal article
Palavras-chave: Syk kinase inhibitor; BAY61-3606 VSMC; Proliferation; Migration.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100403

A standardized protocol for genomic DNA isolation from Terminalia arjuna for genetic diversity analysis
Provedor de dados: 69
Autores: Sarwat,Maryam; Singh Negi,Madan; Lakshmikumaran,Malathi; Kumar Tyagi,Akhilesh; Das,Sandip; Shankar Srivastava,Prem.
For studying genetic diversity in natural populations of Terminalia, a medicinal plant, our attempts to isolate high quality DNA using several previously reported protocols and even modifications were unsuccessful. We therefore combined CTAB based isolation, and column based purification step, to isolate DNA from Terminalia arjuna. The DNA isolated using this standardized protocol was high in quality and suitable for restriction digestion and generation of random amplification of polymorphic DNA (RAPD) and amplified fragment length polymorphism (AFLP).
Tipo: Journal article
Palavras-chave: DNA extraction; Medicinal plants; Molecular markers; Terminalia species.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100011

A statistical approach for assessing the heterogeneity of Hass avocados subjected to different postharvest abiotic stresses
Provedor de dados: 118
Autores: Fuentealba,Claudia; Pedreschi,Romina; Hernández,Ignacia; Saavedra,Jorge.
C. Fuentealba, R. Pedreschi, I. Hernández, and J. Saavedra. 2016. A statistical approach for assessing the heterogeneity of Hass avocados subjected to different postharvest abiotic stresses. Cien. Inv. Agr. 43(3):356-365. Hass avocado (Persea americana Mill.) is marketed worldwide. Due to its complex physiology, a wide variability in postharvest ripening can be observed, i.e., heterogeneity in the number of days to reach edible ripeness. There is a need for a simple and objective method for evaluating the efficacy of postharvest treatments in the reduction of this postharvest ripening heterogeneity given the high demand of import countries for consistent quality and product homogeneity. Therefore, the aim of this study was to compare the appropriateness of...
Tipo: Journal article
Palavras-chave: Avocados; Heterogeneity; Multiple comparison; Ripening; Standard deviation.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300002

A Statistical Study of the Association of Seven Dental Anomalies in the Brazilian Population
Provedor de dados: 77
Autores: Miziara,R. C; Mendes-Junior,C. T; Wiezel,C. E. V; Simões,A. L; Scuoteguazza,J. A. C; Azoubel,R.
The objective of this study was to show the association patterns among seven types of dental anomalies (second pre-molar agenesis, upper side incisive reduced in size, lower first molar infra-ochlesis, enamel hypoplasia, first molar ectopic eruption, supra numerous teeth and upper canine ectopic eruption) in a population sample without dental treatment ranging in age from 7 to 14. A total of 172 patients were attended and underwent the clinical examination at the Clínica Infantil da Fundação Educacional de Barretas. Eleven patients from this total were selected according to a first dental anomaly diagnosis and submitted to panoramic radiography. A significant association (p&lt;0.05) was detected among six pairs of anomalies (second pre-molar agenesis x...
Tipo: Journal article
Palavras-chave: Dental anomalies; Genetics etiology; Brazilian Population.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200025

A strategy to identify genomic expression at single-cell level or a small number of cells
Provedor de dados: 69
Autores: Li,Biaoru.
Recent advances in functional genomics allow us to estimate the expression of several thousands of genes in the mammalian genome. Techniques such as microarrays, expressed tag sequencing (EST), serial analysis of gene expression (SAGE), subtractive cloning and differential display (DD), and two-dimensional electrophoresis gel have been extensively used to screen and analyze parallel gene expression. Some pathological processes, for example, tumorigenesis and solid tumour growth, in which the former is derived from a single-cell and the latter has a mixed-cell problem, present new challenges to the limit of these functional genomic techniques. To fully understand the functions of cells in tumorigenesis or in heterogeneous solid tumour masses, it is...
Tipo: Journal article
Palavras-chave: Genome; Genomic expression; Genomic expression analysis at single cell; Single cell.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100011

A Study of Anatomical Variations of Median Nerve Formation and Its Relation to the Arteries in the Axilla and Arm
Provedor de dados: 77
Autores: Samarawickrama,M. B.
Variations of the peripheral nerve formation, communication and distribution are clinically important because such knowledge can be used for proper planning of surgeries and evaluating effects of nerve injuries and clinical imaging. Median nerve is known to have several such variations. However studies done on median nerve in Sri Lankan subjects are spars. The objective of this study was to find out anatomical variations of the median nerve with regards to its variations in roots and relations to the arteries in the axilla and arm. The study was done using 98 upper limbs of 49 formalin fixed cadavers. They were dissected and anatomy of the median nerve formations was studied focusing its variations of the roots and relation to the arteries. Anatomical...
Tipo: Journal article
Palavras-chave: Median nerve; Roots variations; Abnormal relations; Morphology.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200050

A Study of Dairy Farm Technical Efficiency Using Meta-Regression: An International Perspective
Provedor de dados: 117
This paper develops a meta-regression analysis to explain the variation of mean technical efficiency (PETP) measurements from a total of 65 frontier studies that report technical efficiency (ET) measurements at the dairy farm level in the literature published in English and Spanish. The analysis includes the effect of methodology on ET measurements, as well as the effect of the econometric procedure on the meta-regression estimates. Eight models were estimated, and two of these were selected: a fixed effects specification with dummy variables for the most significant studies without geographical effects (EFS), and a specification where the multiple observations are averaged and geographical effects included (OP). Based on model performance, the EFS option...
Tipo: Journal article
Palavras-chave: Meta-regression; Frontier models; Technical efficiency; Dairy farms.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000200011

A Study of the Anatomical Variations in the Position of the Greater Palatine Foramen in Adult Human Skulls and its Clinical Significance
Provedor de dados: 77
Autores: Dave,Mitesh R; Yagain,Vaishali Kiran; Anadkat,Samir.
Pain is a common distressing symptom in dental practice. Depending upon the cases, different techniques are used to relieve pain. One of these is peripheral trigeminal nerve block. Peripheral trigeminal nerve block anaesthesia has proved to be an effective and convenient way to anaesthetise large regions of oral and maxillofacial complex. This block can be intraoral or extra oral. The intraoral route is through the greater palatine foramen in which the dental surgeons enter into the pterygopalatine fossa, where the maxillary nerve is situated. The morphological variations in the position of greater palatine foramen may be of clinical importance in the administration of local anaesthesia and in palatal surgery. In the present study, the distance of greater...
Tipo: Journal article
Palavras-chave: Greater palatine foramen; Peripheral trigeminal nerve block; Pterygopalatine fossa; Maxillary molars.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200036

A study of the river basins and limnology of five humic lakes on Chiloé Island
Provedor de dados: 97
Autores: VILLALOBOS,L.; PARRA,O.
From November 1996 to October 1997, the river basins of five humic lakes on Chiloé Island were studied monthly: Lakes Natri, Tepuhueico, Tarahuín, Huillinco and Cucao. The objective of this study was to know the catchment area, river basin and the main physical, chemical and biological characteristics of these humic lakes. The trophic status, the actual loading, and the mass balances of phosphorus and nitrogen were determined in relation to anthropogenic activities. Lakes Cucao and Huillinco were characterized by a marine influence. All the lakes had brown coloured waters, caused by humic substances, which limit their transparency. Lake Natri was the deepest (58 m), whereas Lake Tepuhueico had the shallowest depth (25 m). Total phosphorus and nitrogen...
Tipo: Journal article
Palavras-chave: Cuenca hidrográfica; Caracterización limnológica; Lagos húmicos; Chiloé; Sur de Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000400003

A Study of the Staining Effect of Roselle (Hibiscus sabdariffa) on the Histologic Section of the Testis
Provedor de dados: 77
Autores: Egbujo,E. C.; Adisa,O. J; Yahaya,A. B.
This study describes the preparation and use of Roselle (Hibiscus sábddariffa) for the differential staining of testicular tissue sections to find out its staining effect on nuclear, cytoplasmic and other structures. Various treatments using modifications of the plant extract in water were carried out on sections of the rabbit testis. Various levéis of differentiation of nuclear and cytoplasmic structures as well as other structures of this organ was obtained especially when 1% eosin was applied as a counter stain. The best staining result was obtained when iron alum was used to mordant the extract and when the extract, mordanted with potassium alum was acidified using acetic acid and used to stain the sections. Modification of the aqueous extract to an...
Tipo: Journal article
Palavras-chave: Hibiscus sabdariffa; Staining; Testis; Histologic section.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400022

A study on &amp;#946;-defensin-2 and histatin-5 as a diagnostic marker of early childhood caries progression
Provedor de dados: 48
Autores: Jurczak,Anna; Ko&amp;#347;cielniak,Dorota; Papie&amp;#380;,Monika; Vyhouskaya,Palina; Krzy&amp;#347;ciak,Wirginia.
BACKGROUND: Recently, a continuous growth of interest has been observed in antimicrobial peptides (AMPs) in the light of an alarming increase in resistance of bacteria and fungi against antibiotics. AMPs are used as biomarkers in diagnosis and monitoring of oral cavity pathologies. Therefore, the determination of specific protein profiles in children diagnosed with early childhood caries (ECC) might be a basis for effective screening tests and specialized examinations which may enable progression of disease METHODS: The objective of the studies was to determine the role of histatin-5 and &amp;#946;-defensing-2 as a diagnostic marker of early childhood caries progression. In this work, results of concentration determination of two salivary proteins...
Tipo: Journal article
Palavras-chave: &amp;#946; -defensin-2 Histatin-5 Early childhood caries.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100061

A STUDY ON SEDIMENTARY ENVINONMENTS BY REMOTELY SENSED DATA IN THE SOUTHERN TIDAL OF KANGHWA ISLAND, KOREA
Provedor de dados: 72
Autores: Yoo,Hong-Rhyong; Ryu,Joo-Hyung; Bae,Il-Hwan; Ahn,Yu- Hwan.
The southern tidal flat of Kanghwa Island with an area of approximately 90 km² is one of the biggest flats on the western coast of Korea. Remote sensing has been identified as potential tool to provide synoptic information of the intertidal environments. To estimate quantitatively the morphological changes in a tidal flat, it is necessary to measure both the amount of sedimentation or erosion and the sediment facies involved. Thus, the objectives of this study are : (i) to generate an intertidal digital elevation model (DEM) using the waterline method around 1989; (ii) to quantitatively estimate the morphological changes from the generated DEM for the years 1989 and the extracted waterlines for the year 2002; (iii) to discriminate the surface sedimentary...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300049

A Study on the Anomalies of Liver in the South Indian Cadavers
Provedor de dados: 77
Autores: Nayak B,Satheesha.
Liver is the largest gland in the body and rarely shows variations in its lobes and fissures. We studied 55 Formalin-fixed livers for occurrence of abnormal shape, lobes, fissures and position of gall bladder. In 60% of cases the liver was normal. 40% livers showed one or the other variations. Additional lobes were found in 9.09% of cases. Additional fissure was found in 1.81% of cases. Presence of dumbbell shaped caudate lobe and presence of large papillary process was noted in 1.81% cases each. In 1.81% cases the fissure for ligamentum teres was absent or situated on the anterior surface of the liver. In 1.81% of cases each the liver was either extremely long or extremely flat. In 18.18% of the cases, the gall bladder was short and its fundus did not...
Tipo: Journal article
Palavras-chave: Liver; Gall bladder; Variation; Lobe; Fissure; Abnormal.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200051

A Study on the Number and Arrangement of the Structures Passing Through the Porta Hepatis in South Indian Population
Provedor de dados: 77
Autores: Sapna,M; Shetty,Surekha D; Nayak B,Satheesha.
The porta hepatis of the liver is a very important area surgically. The knowledge of the variations in the structures passing through the porta hepatis might be of great help in reducing the risks of surgery in this area. In the current study 59 livers from South Indian cadavers were observed for the number and arrangement of the structures passing through the porta hepatis. In all the livers the portal vein was posteriormost and the hepatic duct was the anteriormost structure. The hepatic artery and its branches were in between the duct and the vein. The mean weight of the liver was 1.025 kg. The mean length of porta hepatis was 4.825 cm and the mean breadth was 2.433 cm. The number varied from one to three for the duct and vein but for the artery it was...
Tipo: Journal article
Palavras-chave: Liver; Porta hepatis; Bile duct; Portal vein; Hepatic artery.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100026

A Study on the Structure and Morphologic Development of Calcaneal Tendon and Triceps Surae Muscle in Human Fetuses during the Fetal Period and the Evaluation of Clinical Importance of Calcaneal Tendon
Provedor de dados: 77
Autores: Kadir,Desdicioglu; Ceren,Uguz; Busra,Sakalli; Esra,Koyuncu; Ali,Malas Mehmet.
It was aimed that the morphometric development of calcaneal tendon and the structures building it up in human fetuses during the fetal period be anatomically studied and that its clinical importance be evaluated. The study comprised a total of 102 fetus legs (51 human fetuses: 26 male and 25 female) whose ages varied between 15-40 gestational week, without external pathology or anomaly. The fetuses were divided in groups according to gestational weeks, trimesters and months. In the wake of the general external measurements of fetuses, leg dissection was performed. Afterwards, the morphometric parameters of gastrocnemius muscle, soleus muscle and calcaneal tendon were measured. The averages and the standard deviations of the measured parameters were...
Tipo: Journal article
Palavras-chave: Fetal development; Morphometry; Calcaneal tendon; Anatomy.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300019

A Study on the Variations in the Formation of the Trunks of Brachial Plexus
Provedor de dados: 77
Autores: Shetty,Surekha D; Nayak B,Satheesha; Madahv,Venu; Braganza,Cilwyn Shalitha; Somayaji,S. N.
Brachial plexus shows several variations in its formation and branching pattern. Variations in the formation of the trunks are very rare. We studied 44 dissected specimens specifically for variations in the formation of the trunks of the brachial plexus. 5 cadavers (11.3%) showed variations in the formation of the trunks. All the variations were unilateral. In one cadaver (2.27%), the middle trunk was formed by union of C7 and C8 roots and lower trunk was formed by T1 root. Upper and middle trunks were fused with each other in one specimen (2.27%). In 3 specimen (6.81%), the C5 root pierced scalenus anterior before joining C6 to form the upper trunk. Knowledge of its variations is of importance to orthopedic surgeons, neurologists and anesthesiologists.
Tipo: Journal article
Palavras-chave: Brachial plexus; Variation; Nerve; Trunks; Roots; Neck.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200042

A Study on the Variations of Size, Shape and External Features of the Spleen in South Indian Population
Provedor de dados: 77
Autores: Nayak B,Satheesha; Somayaji,S. N; Soumya,K. V.
The spleen is the largest lymphoid organ. It is wedge shaped and measures about 1 inch thick, 3 inches broad and 5 inches long. It presents characteristic notches on its superior margin and has a hilum on the visceral surface. The aim was to study the anomalies related to size, shape and external features of the spleen and discuss their clinical importance. As there are not many reports on variations in size shape and features of spleen in the South Indian population, we decided to do this study on cadaveric specimens. We observed 50 spleens fixed with 10% formalin. Among the 50 spleens observed, 25 spleens (50%) were normal and had all the features explained in the textbooks. 25 spleens (50%) did not have any notches on the superior margin, 2 spleens (4%)...
Tipo: Journal article
Palavras-chave: Spleen; Anomaly; Variation; Splenic notch; Anatomy.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300001

A SURVEY OF HETEROCYSTOUS NITROGEN-FIXING CYANOBACTERIA IN CHILEAN RICE FIELDS
Provedor de dados: 73
Autores: Pereira,Iris; Moya,M; Reyes,G; Kramm,V.
The purpose of this study was to increase knowledge of the nitrogen-fixing cyanobacteria communities of Chilean rice fields. To this end, we sampled 34 rice fields situated between latitudes 34° 30' and 36° 36' S in central Chile. At each site, two water samples and one soil sample were taken. Samples were fixed in 4 % formalin before taxonomic determination. A total of 12 filamentous heterocystous taxa were determined, nine of which have not previously been recorded in Chile. For each taxon, a description based on morphological and reproductive characters was made and recorded along with information on the geographical distribution in the study area
Tipo: Journal article
Palavras-chave: Anabaena; Aphanizomenon; Cylindrospermum; Gloeotrichia; Nostoc.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100005

A three-year mark-recapture study in a remnant population of Crocodylus acutus Cuvier in Portete Bay (Guajira, Colombia)
Provedor de dados: 72
Autores: Espinosa,Mara I; Bertin,Angéline; Gómez,John; Mejía,Florencio; Guerra,Martha; Baez,Lina; Gouin,Nicolas; Patiño,Edgar.
The American crocodile, Crocodylus acutus, has experienced important population declines worldwide due to human persecution, overexploitation and habitat loss. C. acutus remains critically endangered in some countries such as Colombia where the lack of detailed surveys on its ecology and distribution constitutes a major barrier to the development of effective conservation strategies. We conducted a three-year capture-recapture study to investigate the demographic status of C. acutus and to identify environmental variables likely to in uence its distribution in Portete Bay (Colombia). We estimated the crocodile population to be relatively small (&lt; 140 animals), to include very few adults, and to demonstrate a very strong de cit in females in the juvenile...
Tipo: Journal article
Palavras-chave: Capture-recapture; Crocodile; Environmental variables; Mangrove.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000200006

A time-energy analysis of daytime surface activity in degus, Octodon degus
Provedor de dados: 97
Autores: Kenagy,G.J.; Vásquez,Rodrigo A.; Nespolo,Roberto F.; Bozinovic,Francisco.
We present an analysis of time and energy allocation in a day-active caviomorph rodent, the degu, Octodon degus, in central Chile. We quantified components of surface activity in the field on a daily basis in individual degus near the time of the summer solstice, when conditions of heat and aridity were also at a seasonal extreme, in order to answer the following questions. Does the absolute time available for surface activity limit performance? Does the allocation of time and energy for locomotion place a functionally significant limitation on overall energy balance and performance? Degus spent about 2/3 of their above-ground time foraging; they remained stationary about 88 % of the time, walked around slowly about 10 %, and were running rapidly from one...
Tipo: Journal article
Palavras-chave: Time; Energy; Activity; Central Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100014

A tribute to Dr. Teresa Pinto-Hamuy
Provedor de dados: 48
Autores: Robles,Luis; Torrealba,Fernando; Santos,Manuel.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000400001

A TRIBUTE TO FRANCISCO VARELA
Provedor de dados: 48
Autores: Bacigalupo,Juan; Palacios,Adrián.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000100001

A tribute to Professor Claudio Barros (1936-2008)
Provedor de dados: 48
Autores: Moreno,Ricardo; Santos,Manuel J.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000200001

A Tribute to Professor Gustavo Hoecker Salas
Provedor de dados: 48
Autores: Ferreira,Arturo; Valenzuela,Carlos; Santos,Manuel J.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300001

A TROPICAL PACIFIC PREDICTION SYSTEM OF INTERMEDIATE COMPLEXITY: ROLE OF THE VERTICAL STRUCTURE VARIABILITY
Provedor de dados: 72
Autores: Dewitte,B; Ganachaud,A; Dejoan,M.-A; Grimini,P; duPenhoat,Y.
An intermediate ocean-atmosphere coupled model of the tropical Pacific is used to investigate the sensitivity of the seasonal forecasts to the configuration of the oceanic vertical structure. The models consist in a three baroclinic mode tropical Pacific Ocean model and a Gill (1980)'s tropical atmosphere. The predictive skill of the model using a simple nudging method for the initialization is first presented from 1970 and compared to the results of other prediction system of similar complexity, which emphasizes the modulation of the skill on decadal timescales. It is then demonstrated that the skill is critically dependant on the energy distribution on the baroclinic mode, higher-order mode contributions being favored at some period and not at others....
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200027

A Variation of Phrenic Nerve: Case Report and Review
Provedor de dados: 77
Autores: Prakash,; Prabhu,Latha V; Kumar,Jwalaram; Madhyastha,Sampath; Singh,Gajendra.
During routine dissection in the Department of Anatomy following anatomical variations of phrenic nerve were observed on right side in the neck region of a middle aged cadaver. The phrenic nerve in its early course close to its origin was giving a communicating branch to C5 root of brachial plexus and at the level of the root of neck just before entering the thorax, the phrenic nerve was placed anterior to the subclavian vein. This unique case of phrenic nerve variation gains tremendous importance in context of subclavian vein cannulation, implanted venous access portals, and supraclavicular nerve block for regional anesthesia
Tipo: Journal article
Palavras-chave: Phrenic nerve; Neck; Anatomical variations.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500029

A VEGETATION MAP OF NEVADOS DE CHILLAN VOLCANIC COMPLEX, BIO-BIO REGION, CHILE
Provedor de dados: 73
Autores: Pfanzelt,Simon; Grau,Jürke; Rodríguez,Roberto.
A vegetation survey of the AndeanNevados de Chillan volcanic complex, Bio-Bio Region, Chile, resulted in the preparation of a colour vegetation map, based on photo-interpretation of an aerial photograph of 1998. Classification followed a divisive method and combined physiognomic, floristic, and pedologic criteria. It resulted in eleven distinguishable vegetation units: (1) Nothofagus dombeyi forest, (2) N. pumilio forest, (3) Nothofagus mixed forest, (4) N. pumilio krummholz, (5) N. antárctica krummholz, assemblages of (6)Adesmia emarginata-Pozoa coriácea, (l)Adesmia emarginata-Berberis empetrifolia, (K) Adesmia emarginata-Loasa lateritia, (9) Chusquea culeou-Cokones, and (10) Caltha sagittata-Mimulus luteus, and the (11) Nassauvia revoluta-Poa obvallata...
Tipo: Journal article
Palavras-chave: Southern Andes; Vegetation cartography; Photo-interpretation; Termas de Chillan.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200007

A walk with Francisco Varela from first- to second-generation networks: In search of the structure, dynamics and metadynamics of an organism-centered immune system
Provedor de dados: 48
Autores: COUTINHO,ANTÓNIO.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000100004

Abiotic alterations caused by forest fragmentation affect tree regeneration: a shade and drought tolerance gradient in the remnants of Coastal Maulino Forest
Provedor de dados: 97
Autores: GUERRERO,PABLO C; BUSTAMANTE,RAMIRO O.
Plant regeneration is strongly determined by light and soil moisture differences between habitáis; both variables are modified by large-scale forest fragmentation. Several studies have indicated this alteration as the mechanism involved in tropical forest community change. The effects of fragmentation may be much more severe in Mediterranean and deciduous forests, because plant species in these forests show a stress tolerance tradeoff between shade and drought. Our study was performed in the deciduous fragmented Coastal Maulino Forest: Reserva Nacional Los Queules (RNLQ) and surrounding small fragments. We hypothesised that Aristotelia chilensis (shade intolerant but drought tolerant) should increase its regeneration in small patches as a consequence of...
Tipo: Journal article
Palavras-chave: Ecological restoration; Forest fragmentation; Safe sites; Seed germination; Seedling establishment.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300008

Abiotic gradients drive floristic composition and structure of plant communities in the Monte Desert
Provedor de dados: 97
Autores: ACEBES,PABLO; TRABA,JUAN; PECO,BEGOÑA; REUS,MARÍA L; GIANNONI,STELLA M; MALO,JUAN E.
Defining plant communities in desert zones is difficult due to large scale homogeneity and small scale heterogeneity, thus making provision of systematic information for conservation decisions problematic. We analysed plant communities of the most arid sector of Monte Desert for structure, plant composition and environmental variables. Small-scale variables such as slope, rock cover, bare ground and litter, as well as large-scale ones such as species diversity, composition and similarity within and between sites were included. Analyses of floristic composition showed the difficulty of segregating distinct communities due to high internal heterogeneity and overlap between the different sites. Only mesquite woodlands, a community situated at the extreme of...
Tipo: Journal article
Palavras-chave: Arid environment; Heterogeneity; Shrubland; Similarity; Species richness.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000300007

Abnormal Branch of External Iliac Artery in the Iliac Fossa
Provedor de dados: 77
Autores: Nayak B,Satheesha.
An abnormal artery arising from external iliac artery was found during routine dissection class for medical undergraduates. The artery took its origin from the external iliac artery midway between its origin from common iliac and termination as femoral artery. The abnormal artery divided into two branches; an ascending and a descending. The ascending branch supplied iliacus and iliac crest. The descending branch entered the femoral triangle by passing behind the femoral sheath. It supplied the muscles of femoral triangle and anastomosed with medial circumflex femoral artery. The knowledge of this variation may be of use for surgeons doing surgery of femoral hernia.
Tipo: Journal article
Palavras-chave: External iliac artery; Anatomical variation; Iliac fossa.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200033

Abnormal Branching of the Axillary Artery: Subscapular Common Trunk. A Case Report
Provedor de dados: 77
Autores: Saralaya,'Vasudha; Joy,Theresa; Madhyastha,Sampath; Vadgaonkar,Rajanigandha; Saralaya,Shruti.
An unusual unilateral variation in the branching pattern of axillary artery was observed in a 60 year oíd female embalmed cadáver. The axillary artery had only two branches arising from its proximal (first) part and no branches from its remaining distal (second &amp;amp; third) parts. The branches are superior thoracic (usual) and another large collateral (unusual) branch. This collateral branch is the origin of several important arteries as the circumflex scapular, thoracodorsal, posterior circumflex humeral, thoraco-acromial and lateral thoracic arteries. We propose to ñame this artery as common subscapular trunk. The course of this collateral artery (common subscapular trunk) and its branches and also clinical significance of this variation are...
Tipo: Journal article
Palavras-chave: Axillary artery; Common subscapular trunk.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400029

Abnormal Branching Pattern of the Axillary Artery and its Clinical Significance
Provedor de dados: 77
Autores: Ramesh Rao,T; Shetty,Prakashchandra; Suresh,R.
The increasing use of invasive diagnostic and interventional procedures in cardiovascular diseases makes it important that the type and frequency of vascular variations are well documented and understood. Sound knowledge of neurovascular variations is important for surgeons who remove axillary lymph nodes, to anesthesiologists, and orthopedic surgeons, considering the frequency of procedures done in this region. An unusual variation in the branching pattern of axillary artery was observed on the left side of a 60 year old female cadaver. In the present case the course and distribution of the first and second part of the axillary artery were normal. But a rare case of unusual origin of subscapular, anterior and posterior circumflex humeral, profunda brachii...
Tipo: Journal article
Palavras-chave: Axillary artery; Subclavian artery; Brachial artery; Vascular variation.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200022

Abnormal Electrophysiological Activation in Schizophrenics during a Personal Traits Attribution Task
Provedor de dados: 48
Autores: SILVA,JAIME R; TORRES,WALTER M; ORTIZ,MANUEL S.
Changes in personal identity have been described as a major component in the expression of schizophrenia. Considering current evidence that relates the cortical structures of the medial line with the self, we hypothesize that there are differences in the frontomedial electrophysiological activation in schizophrenics when compared to normal subjects during tasks that require this function. In an experimental design, 9 schizophrenic and 7 normal subjects participated in a personal traits attribution task regarding the attribution of the self, another person and a simple reading. Electric brain activity was recorded with a dense array of 128 electrodes, with evoked brain potentials being obtained for the three conditions. Considering the evoked potential...
Tipo: Journal article
Palavras-chave: Schizophrenia; Event related potential; Self.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000200003

Aboveground biomass in Prosopis pallida (Humb. and Bonpl. ex Willd.) H. B. K. ecosystems using Landsat 7 ETM+ images
Provedor de dados: 97
Autores: PADRÓN,EVA; NAVARRO-CERRILLO,RAFAEL M.
The significance of field work in remote sensing studies when applied to large areas has often been underestimated. The combination of specific forest inventories for the estimation of aboveground biomass in large dry tropical forest areas with remote sensor data has scarcely been explored to date. In this work, a systematic, stratified forest inventory involving 100 X 100 m square plots in an area of Peruvian Prosopis pallida dry forest, roughly one million hectares in size in the Piura province (Peru) has been compiled. The inventory encompassed the principal silvicultural variables defining the ecosystem studied, which were used in allometric equations for the different species, genera and plant associations in the area in order to estimate the amount...
Tipo: Journal article
Palavras-chave: Prosopis pallida; Landsat 7 ETM+; Vegetation indices; Biomass estimation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000100004

Absence of Inferior Gluteal Artery: A Rare Observation
Provedor de dados: 77
Autores: Reddy,Sreenivasulu; Ramana  Vollala  ,Venkata; Rao,Mohandas.
The gluteal region is an important anatomical and clinical area which contains muscles and vital neurovascular bundles. They are important for their clinical and morphological reasons. In this manuscript we report a rare case of absence of inferior gluteal artery. In the same specimen the superior gluteal artery was taking origin from the anterior division of internal iliac artery. The structures normally supplied by the inferior gluteal artery were supplied by a branch coming from the superior gluteal artery. The developmental and clinical significance of the anatomical variation is discussed
Tipo: Journal article
Palavras-chave: Internal iliac artery; Inferior gluteal artery; Superior gluteal artery; Anatomical variation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100012

Absence of Musculocutaneous Nerve Associated with Variations of Distribution Patterns of the Median Nerve
Provedor de dados: 77
Autores: Zhang,Yong; Yang,Shengbo; Yang,Fangjiu; Xie,Peng.
Variations in the brachial plexus and the distribution patterns of its branches are not uncommon. A communicating branch, which is the most frequent variation, often arises from musculocutaneous nerve to median nerve. However, the branches arising from lateral cord of the brachial plexus and median nerve instead of musculocutaneous nerve are very rare. Detailed description of the abnormalities is important for surgical procedures. Our case study reports the musculocutaneous nerve was absent, a branch from the medial cord innervated the coracobrachialis muscle and two branches from the median nerve innervated the biceps and brachialis muscles, respectively. Moreover, the median nerve gave off the lateral antebrachial cutaneous nerve. This report provides...
Tipo: Journal article
Palavras-chave: Brachial plexus; Musculocutaneous nerve; Median nerve; Absence.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200014

Absence of the Arteria Profunda Femoris
Provedor de dados: 77
Autores: Otag,I; Çimen,M; Solak,O; Otag,A; Çimen,F. G; Kosar,M. I.
At arteria femoralis, arteria profunda femoris is the main branch feeding the thigh. After iliofemoral embryological evolution many variations can be seen in this vessel. The absence of a. profunda femoris is one of the rare seen variation among these variations. Knowing the anatomy and variations of a. profunda femoris well, is important in low extremity ischemia, vessel surgery and angiography applications. In this study, 1036 films belonging to low extremity found in the Radiology department of School of Medicine of Cumhuriyet University were examined as retrospective. Among these films at four of them of male cases, absence of a. profunda femoris was detected. In cases at ages of 32, 37, 47 and 53 respectively, in the first and second case at the right...
Tipo: Journal article
Palavras-chave: Arteria profunda femoris; Arteria femoralis; Variation; Angiography.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200012

ABSOLUTE CALIBRATION OF THE ERS-2 SCATTEROMETER IN GYRO-LESS MODE USING TRANSPONDERS
Provedor de dados: 72
Autores: Manise,Nicolas; Neyt,Xavier; Acheroy,Marc.
The scatterometer on-board ERS-2, earth-observation satellite developed by the European Space Agency, is an active real aperture radar instrument designed to measure the backscatter coefficient 0 from the earth. Its main utility is to measure physical parameters such as wind speeds and directions over the sea surface. Due to malfunctions of the on-board gyroscopes and even though a new attitude and orbit control system is used, the yaw-orientation of the spacecraft still exhibits random variations from the nominal attitude. This unpredictable attitude requires re-developing the calibration chain of the scatterometer instrument. Distributed targets, such as the rain forest, are used to perform a relative calibration while transponders situated at known...
Tipo: Journal article
Palavras-chave: Scatterometer; Calibration; Transponder.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300011

Absorption Levels and Morphological Features of Fetal Organs in Wistar Rats Treated with Lead Acetate
Provedor de dados: 77
Autores: Bomfim,Kátia Michelle dos Anjos; Garcia,Carlos Alexandre Borges; Reis,Francisco Prado; Palmeira,José Arnaldo Vasconcelos; Scher,Ricardo; de Lucca Júnior,Waldecy; Aragão,José Adeval; Vasconcelos,Francis Lima; Albuquerque Júnior,Ricardo Luiz Cavalcanti; Feitosa,Vera Lúcia Corrêa.
Lead is one of the heavy metals most used in industry. Poisoning due to long-term lead exposure is known as saturnism, and is an occupational illness that has been known for many years. Lead is highly toxic and can compromise the structural and functional patterns of organs and systems. The aim of this study was to examine the lungs and kidneys of fetuses from female Wistar rats exposed to lead acetate. In this study, the lungs and kidneys of 20 fetuses from female rats that had previously been treated with lead acetate were dissected, fixed, embedded in paraffin and stained with hematoxylin and eosin. Macroscopic changes to the shape, color and consistency of organs from fetuses treated with this heavy metal were observed, in comparison with organs from...
Tipo: Journal article
Palavras-chave: Lead acetate; Fetuses; Lung; Kidney.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100021

ABSTRACTS OF THE POSTER PRESENTANTIONS
Provedor de dados: 48
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200020

ABSTRACTS OF THE SPEAKERS' PRESENTATIONS
Provedor de dados: 48
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200019

Abundance and prevalence of Aphidius avenae (Hymenoptera: Braconidae: Aphidiinae) in Chile
Provedor de dados: 118
Autores: Peñalver-Cruz,Ainara; Ortiz-Martínez,Sebastián; Villegas,Cinthya; Tomanovic,Zeljko; Zepeda-Paulo,Francisca; Zikic,Vladimir; Lavandero,Blas.
Abstract During the samplings described here, Aphidius avenae (=picipes) (Haliday, 1834) was collected. This species has been reported in Chile but has never been studied in terms of its relative abundance and prevalence in central and southern Chile by using classical or molecular methods. The composition of the parasitoid assemblages on several cereal aphid hosts was examined for three seasons in agricultural landscapes. In this note, we describe the prevalence of this parasitoid species in cereal aphids and other aphid hosts and discuss the abundance of this parasitoid compared to other aphid parasitoids and the probable origins of this important aphid parasitoid species in Chile. The results indicate that A. avenae has a low prevalence compared to...
Tipo: Journal article
Palavras-chave: Aphids; Braconidae; Hosts; Parasitoids; Tomato; Wheat.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000200207

Abundance, distribution and feeding patterns of a temperate reef fish in subtidal environments of the Chilean coast: the importance of understory algal turf
Provedor de dados: 97
Autores: PALMA,ÁLVARO T.; OJEDA,F. PATRICIO.
Cheilodactylus variegatus is an abundant carnivorous demersal reef fish that lives in the shallow subtidal of the north-central Chilean coast. Characteristically, these environments are dominated by kelp forests of Lessonia trabeculata. This species preys on a great variety of benthic invertebrates, and shows particularly high consumption rates on amphipod crustaceans. In our study, two widely separated populations of C. variegatus were considered (central and northern Chile). Individuals that form part of these populations show considerable differences in their distribution, abundance and trophic behavior. In the northern zone, the species is abundant and both juveniles and adults are distributed along the whole bathymetric gradient. This contrasts with...
Tipo: Journal article
Palavras-chave: Cheilodactylidae; Shallow subtidal; Understory macroalgae; Carnivorous fish; Amphipods; Distribution; Abundance; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100018

Abundance estimation of Commerson’s dolphin in the eastern area of the Strait of Magallan-Chile
Provedor de dados: 97
Autores: LESCRAUWAET,ANNE-CATHERINE; GIBBONS,JORGE; GUZMAN,LEONARDO; SCHIAVINI,ADRIAN.
Abundance of Commerson‘s dolphin, Cephalorhynchus commersonii (Lacépède 1804), in the eastern portion of the Strait of Magellan was estimated by means of aerial transects in autumn (June 1996). Using a helicopter at 100 m altitude and 129 km h-1, 58 sightings representing 98 animals (average group size Es = 1.7, SD = 0.13) along 818.6 km of linear transects were recorded. Data analysis with "Distance" software gave a density estimation of 0.34 ind km-2 (CV = 0.27) and a population size of 1,206 (95% CI 711-2,049 individuals). Commerson’s dolphin showed a habitat preference for the narrows, compared to open waters in the study area.
Tipo: Journal article
Palavras-chave: Commerson’s dolphin; Cephalorhynchus commersonii; Strait of Magellan; Line transect sampling; Habitat preference.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300010

Abundancia Estacional de Insectos Vectores de Virosis en dos Ecosistemas de Pimiento (Capsicum annum L.) de la Región de Coquimbo, Chile
Provedor de dados: 113
Autores: Quiroz E.,Carlos; Larraín S.,Patricia; Sepúlveda R.,Paulina.
La fluctuación estacional de insectos vectores de virus asociados a pimientos (Capsicum annum L.) se estudió durante dos temporadas en Cerrillos de Tamaya (Limarí) (30°29’ lat. Sur; 71°16’ long. Oeste) y Pan de Azúcar (Elqui) (29°55’ lat. Sur; 71°14’ long. Oeste), dos localidades representativas del área productora de pimiento de la Región de Coquimbo, Chile. La actividad máxima de vuelo de pulgones en ambas temporadas y localidades se produjo en primavera (agosto-noviembre). Myzus persicae Sulzer y Macrosiphum euphorbiae (Thomas) fueron las únicas especies de pulgones que colonizaron plantas de pimiento. La colonización de las plantas por estos pulgones coincidió con la época de capturas máximas en las trampas Moericke. Frankliniella occidentalis...
Tipo: Journal article
Palavras-chave: Pulgones; Trips; Pimiento.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100001

Abundancias poblacionales, crecimiento y mortalidad natural de la macroinfauna de crustáceos en dos tipos morfodinámicos de playas arenosas del sur de Chile
Provedor de dados: 97
Autores: CONTRERAS,HERALDO; JARAMILLO,EDUARDO; DUARTE,CRISTIAN; McLACHLAN,ANTON.
Se realizaron muestreos mensuales durante 1994-1996 en una playa arenosa intermedia y en una playa disipativa del sur de Chile (Calfuco y Mehuín, respectivamente; ca. 39&amp;ordm; S), para evaluar las predicciones de la hipótesis de exclusión por la resaca sobre las abundancias poblacionales e historia de vida de la macroinfauna de crustáceos que habita en el intermareal de esas playas. Se hipotetiza que solo las especies realmente intermareales (i.e., directamente afectadas por la resaca) son afectadas por diferencias en los tipos morfodinámicos de playas. Esas especies fueron los isópodos cirolánidos Excirolana braziliensis y Excirolana hirsuticauda y el cangrejo anomuro Emerita analoga. Por otra parte, el anfípodo Orchestoidea tuberculata...
Tipo: Journal article
Palavras-chave: Macroinfauna de playas arenosas; Crustáceos; Tipos morfodinámicos de playas; Sur de Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000400002

Academic Achievement and Perception of Two Teaching Methods in Histology: Light Microscopy and Digital Systems
Provedor de dados: 77
Autores: Becerra G,Daniela; Grob L. P,Melisa; Rodríguez R,Ángel; Barker M,María José; Consiglieri L,Lucas; Ferri G,Giorgio; Sabag S,Natividad.
With the advent of digital systems, the role of the microscope as an irreplaceable instrument in the practical teaching of histology has been called into question. In this study academic performance and student perception for three learning methods was compared: digital systems, microscopy, and microscopy plus digital systems, in the muscle tissue unit of the morphology course for first-year dentistry at the Universidad de los Andes, Santiago, Chile. Ninety-five students were divided into 3 groups: Group 1: individual optical microscopy, Group 2: digital systems (one projector per room), and Group 3: microscopy plus digital systems. All participants observed the same striate muscle, cardiac striated muscle, and smooth muscle mounts. Their diagnostic...
Tipo: Journal article
Palavras-chave: Medical education; Histology; Visual learning; Virtual slides; Microscopy.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300001

Academic Manpower Training Policy in Israel in the Area of Biotechnology
Provedor de dados: 69
Autores: Herskovic,Shlomo.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200003

Acaena magellanica (Lam.) Vahl (Rosaceae)
Provedor de dados: 73
Autores: Marticorena,A. E.; Cavieres,L. A.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100011

ACALODEGMA VIDALI, NUEVA ESPECIE ALTOANDINA DE PRIONINAE (COLEOPTERA: CERAMBYCIDAE) DE CHILE
Provedor de dados: 72
Autores: Elgueta,Mario; Cerda,Miguel.
RESUMEN Se describe una nueva especie de Macrodontini de Chile: Acalodegma vidali n. sp. Se ubica en el género Acalodegma, decisión que involucra un sentido ampliado a aquel conjunto de caracteres establecidos originalmente para el género. La nueva entidad específica tiene hasta el momento una distribución exclusiva en la Cordillera de los Andes alrededor de los 27&amp;ordm; 36' S y 69&amp;ordm; 20' O, área que corresponde a un ambiente de tipo prepuneño; dada esta distribución es altamente probable que se presente en similares ambientes del noroeste de Argentina. A fin de entender esta repartición en un contexto biogeográfico, se entregan antecedentes biológicos generales y de distribución geográfica para las especies de Prioninae reportadas para Chile
Tipo: Journal article
Palavras-chave: Prioninae; Macrodontini; Acalodegma; Distribución; Hábitat; Chile; Argentina.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100003

Acceptance of Transgenic Milk in La Araucania Region,Chile
Provedor de dados: 117
Autores: Schnettler M,Berta; Sepúlveda B,Oriana; Ruiz F,Danilo.
Considering the high level of concern caused by genetically modified foods (GMF) in developed countries, the relevance of this variable in decision-making about the purchase of fluid milk among consumers in Temuco (La Araucanía Region, Chile) was determined. By means of a personal survey of 400 people and using conjoint analysis, it was determined that the presence of genetic modifications in food was more important (44.7%) than brand (29.5%) and price (25.5%) in the decision-making process. By cluster analysis three segments were identified; the largest group (46.5%) gave similar relevance to food production and brand, preferring genetically modified milk. For the second group (41.5%), the presence or absence of genetic modification was the most important...
Tipo: Journal article
Palavras-chave: Genetically modified foods (GMF); Fluid milk; Cluster analysis; Conjoint analysis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400008

Accessory Head of Flexor Pollicis Longus Muscle and its Significance in Anterior Interosseous Nerve Syndrome: Case Report and Review
Provedor de dados: 77
Autores: Potu,Bhagath Kumar; Gorantla,Vasavi Rakesh; Pulakunta,Thejodhar; Rao,M. S; Mamatha,T; Vollala,Venkata Ramana; Nayak,S. R.
During the laboratory dissection of the fore arm, an accessory head of flexor pollicis longus muscle has been observed unilaterally in the right upper limb of a male cadaver. It took its origin from the under surface of flexor digitorum superficialis muscle just distal to the origin of this muscle from medial epicondyle. On further dissection we have noticed that, the accessory belly was running downwards to the medial aspect of the tendon of flexor pollicis longus muscle for its insertion. Its possible role in anterior interosseous syndrome is discussed in detail with a brief review
Tipo: Journal article
Palavras-chave: Anatomy; Anatomical variation; Flexor pollicis longus muscle.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400037

Accessory Hepatic Artery Arising from Celiac Trunk: An Incidence in a Thai Cadaver
Provedor de dados: 77
Autores: Chanasong,Rachanee; Putiwat,Phongpitak; Roboon,Jureepon; Sakulsak,Natthiya.
An exhaustive knowledge of the liver vascular patterns as well as possible anatomical variations is significant in the planning and performance of all liver surgical procedures in order for the vascularity not to be disturbed or not causing necrosis of the liver parenchyma postoperatively. The celiac trunk usually provides three branches; left gastric, splenic and common hepatic arteries. The left and right hepatic arteries generally derive from proper hepatic artery which is a branch of common hepatic artery. To study the incidence of celiac trunk ramification, the branching patterns of the celiac trunk of 23 Thai cadavers (17 males, 6 females) were documented during routine dissection by medical students at the Department of Anatomy, Faculty of Medical...
Tipo: Journal article
Palavras-chave: Accessory hepatic artery; Celiac trunk; Thai cadaver.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400002

Accessory Mental Foramina Assessed by Cone-Beam Computed Tomography: Report of Unilateral and Bilateral Detection
Provedor de dados: 77
Autores: Garay,Ivonne; Cantín,Mario.
Accessory mental foramen (AMF) is a rare anatomical variation with particular importance in local anesthesia and surgical procedures, especially the placement of dental implants. We report the cases of two adult patients, which were referred for Cone-Beam Computed tomography (CBCT) evaluation, which revealed the presence of three AMFs connected to the mandibular canal, one case with one AMF on the right side unilaterally, and another case was bilateral. The mean diameter measured for the AMFs was 1.23 (±0.45) mm, and the mean distance from the mandibular foramen to the AMF was 3.3 (±1.5) mm, with the AMF located in the premolar area superiorly or distally to the MF. CBCT is an effective tool for tridimensional assessment of AMF. A CBCT should be obtained...
Tipo: Journal article
Palavras-chave: Accessory mental foramen; Anatomical variation; Mental foramen; Cone-beam Computed tomography.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300052

Accessory Muscles: A Cause of Nerve Compression in the Distal Forearm. Case Report and Literature Review
Provedor de dados: 77
Autores: Román Veas,Javier; Ruiz Conrads,Pedro; Braga Silva,Jefferson.
Nerve compression by anomalous muscles located at the wrist and distal forearm is an infrequent condition. Accessory muscles may compress underlying structures in the Carpal Tunnel region or ulnar canal , producing pain and paresthesia. Two cases of ulnar and median nerve compression, caused by prominent accessory muscles at the distal forearm, are described. Literature review is presented.
Tipo: Journal article
Palavras-chave: Muscles; Nerve Compression Syndromes; Anatomic Variation.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100015

Accessory Tendon and Tripartite Insertion Pattern of Fibularis Longus Muscle: A Case Report
Provedor de dados: 77
Autores: Jayakumari,S; Suri,R. K.; Rath,G; Arora,J.
The fibular muscles are the chief everters of foot and play an important role in stabilizing its subtalar motion. In the present case detected incidentally, we report a case of an accessory tendon and tripartite insertion pattern of fibularis longus muscle in the left leg, out of which two slips were attached to plantar and lateral aspects of base of first metatarsal and the third slip was found blending with first dorsal interosseous muscle. Awareness and precise knowledge of such anatomical variants are important to surgeons performing reconstructive procedures
Tipo: Journal article
Palavras-chave: Fibularis longus muscle; Accessory tendon; Tripartite insertion.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500019

Acción Antimicrobiana in vitro de la Miel de Abejas sobre los Microorganismos Cariogénicos Estreptococos del Grupo mutans
Provedor de dados: 77
Autores: Salazar,Luis A; Medina,Felipe; Donoso,Francisco; Barrientos,Leticia; Sanhueza,Antonio.
En el presente estudio fue evaluada la actividad antimicrobiana in vitro de cuatro muestras de mieles producidas en nuestro país, sobre los recuentos de estreptococos del grupo mutans, en escolares con alto riesgo de caries dental. Se obtuvieron muestras de saliva de 20 escolares, con edades entre 12 y 14 años, pertenecientes a la ciudad de Temuco, Región de La Araucanía (Chile). El recuento de estreptococos del grupo mutans en saliva fue estimado por el método microbiológico semi-cuantitativo Linoscreen®. La evaluación de la acción antibacteriana de la miel se realizó en 9 escolares que presentaron los recuentos más elevados de estreptococos del grupo mutans, utilizando concentraciones de miel entre 5% y 35%. Los datos mostraron que el 100% de los niños...
Tipo: Journal article
Palavras-chave: Caries; Estreptococos del grupo mutans; Actividad antibacteriana; Miel.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100014

Acción del Etanol sobre el Epitelio Nasal y Glándulas Septales de Ratas, Durante la Lactancia
Provedor de dados: 77
Autores: Marcondes de Godoy,Marcos; Lopes,Ruberval A.; Sala,Miguel A.; Vinha,Dionísio; Regalo,Simone C. H.
El consumo materno de etanol durante la lactancia altera la composición de la leche, provoca la aparición de etanol y acetaldehído en la leche y agrava los efectos del etanol en las crías de ratas. De este modo, fueron estudiados los efectos del etanol, administrado a las ratas madres durante la lactancia, sobre el epitelio respiratorio y en las glándulas septales anterior y posterior de las crías lactantes con 21 días de vida postnatal. Las ratas recibieron etanol al 20% en el bebedero, ad libitum durante los 21 días que amamantaron. Los controles recibieron un volumen similar de agua sin alcohol. Las crías fueron sacrificadas en el 21 día. Las cabezas fueran cortadas frontalmente. Los cortes seriados de 6 µm de grosor fueron teñidos con hematoxilina y...
Tipo: Journal article
Palavras-chave: Alcoholismo; Cariometría; Estereología; Epitelio Respiratorio; Glándulas Septales; Lactancia; Rata.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000400002

Acciones y avances sobre la conservación de insectos en Chile
Provedor de dados: 72
Autores: JEREZ,VIVIANE; ZÚÑIGA-REINOSO,ÁLVARO; MUÑOZ-ESCOBAR,CHRISTIAN; PIZARRO-ARAYA,JAIME.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100001

Acclimatization to chronic intermittent hypoxia in mine workers: a challenge to mountain medicine in Chile
Provedor de dados: 48
Autores: Farias,Jorge G; Jimenez,Daniel; Osorio,Jorge; Zepeda,Andrea B; Figueroa,Carolina A; Pulgar,Victor M.
In the past two decades, Chile has developed intense mining activity in the Andes mountain range, whose altitude is over 4,000 meters above sea level. It is estimated that a workforce population of over 55,000 is exposed to high altitude hypobaric hypoxia. The miners work under shift systems which vary from 4 to 20 days at the worksite followed by rest days at sea level, in a cycle repeated for several years. This Chronic Intermittent Hypoxia (CIH) constitutes an unusual condition for workers involving a series of changes at the physiological, cellular and molecular levels attempting to compensate for the decrease in the environmental partial pressure of oxygen (PO2). The mine worker must become acclimatized to CIH, and consequently undergoes an acute...
Tipo: Journal article
Palavras-chave: High Altitude; Mine Workers; Intermittent Hypoxia; Acclimatization; Chilean Model.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000100009

Accommodating the difference in students' prior knowledge of cell growth kinetics
Provedor de dados: 69
Autores: Seters,Janneke van; Ossevoort,Miriam; Goedhart,Martin; Tramper,Johannes.
This paper describes the development and benefits of an adaptive digital module on cell growth to tackle the problem of educating a heterogeneous group of students at the beginning of an undergraduate course on process engineering. Aim of the digital module is to provide students with the minimal level of knowledge on cell growth kinetics they need to comprehend the content knowledge of the subsequent lectures and pass the exam. The module was organised to offer the subject matter in a differentiated manner, so that students could follow different learning paths. Two student groups were investigated, one consisting of students who had received their prior education abroad and one of students that had not. Exam scores, questionnaires, and logged user data...
Tipo: Journal article
Palavras-chave: Adaptive digital learning material; Bioreactor design; Biotechnology; Education; Intelligent tutoring system; Intelligent Web-based educational system.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200001

Accumulation capacity of cadmium and copper and their effects on photosynthetic performance in Azolla filiculoides Lam. under induced rhizofiltration
Provedor de dados: 73
Autores: Valderrama,Aly; Carvajal,Danny E.; Peñailillo,Patricio; Tapia,Jaime.
ABSTRACT This study evaluated the capacity of Azolla filiculoides to enhance heavy metal accumulation through the addition of different concentrations of cadmium (Cd) and copper (Cu), as ethylenediaminetetraacetic acid (EDTA) complexes, under hydroponic conditions. The physiological effect was determined by Photosynthetic efficiency (Fv/Fm) as an indicator of plant stress, and heavy metal content was measured with flame atomic absorption spectroscopy in the whole plants. The results obtained in rhizofiltration systems did not show an increase in accumulation when Cd-EDTA was added, but the Cu-EDTA increased the accumulation of Cu by plants. Although the Fv/Fm was decreased in all treatments, only the Cd-EDTA complex caused damage to photosystem II (PSII)...
Tipo: Journal article
Palavras-chave: EDTA; Azollaceae; Cadmium; Copper; Photosynthetic metabolism.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200283

Accumulation of Antioxidants in Apricot Fruit through Ripening: Characterization of a Genotype with Enhanced Functional Properties
Provedor de dados: 48
Autores: Hegedüs,Attila; Pfeiffer,Péter; Papp,Nóra; Abrankó,László; Blázovics,Anna; Pedryc,Andrzej; Stefanovits-Bányai,Éva.
Two apricot genotypes, 'Gonci magyarkajszi' and 'Preventa' were assayed at three ripening stages for flesh color indices (L*, a*, b*, C* and Hº), contents of total phenolics and vitamin C, and both water- and lipid-soluble antioxidant capacities (ferric reducing antioxidant power; 2,2'-diphenyl-1-picrylhydrazyl scavenging activity; total radical scavenging activity; and Photochem lipid-soluble antioxidant capacity) to compare their dynamics in the accumulation of antioxidant compounds and capacities through ripening. The increase in a*, b* and C* and decrease in Hº during ripening represented a color shift from green to yellow and orange due to carotenoid accumulation. Parallel to carotenoid accumulation, contents of total phenolics and vitamin C and...
Tipo: Journal article
Palavras-chave: Antioxidant capacity; Apricot; Color; Ripening; Total polyphenolic content; Vitamin C.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000400004

Accumulation of macronutrients in cv. 'Astrus' cabbage as influenced by nitrogen dose and plant population
Provedor de dados: 118
Autores: Filho,Arthur B. Cecílio; Cavarianni,Rodrigo L; Nowaki,Rodrigo H. D.
The influence of plant population (31,250 and 46,875 plants ha-1) and nitrogen doses (0, 100, 200, and 300 kg ha-1) on the accumulation of macronutrients by cabbage plants was studied in Jaboticabal, Brazil, from February 18 to June 2, 2004. The experimental design was a randomized complete block in a 2 × 4 factorial scheme, with three replications. Differences in the amount of macronutrients accumulated by cabbage as function of N dose and plant population, were observed. The largest amounts of macronutrients were detected at the end of the plant cycle when the plant population was the lowest. The amounts of N, P, K, and S were not significantly different when the N dose was increased from 100 to 300 kg ha-1. The accumulated amounts of Ca and Mg were not...
Tipo: Journal article
Palavras-chave: Brassica olerácea var. capitata; Spacing; Uptake nutrients.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200013

Accuracy in the Diagnosis of the Mental Nerve Loop: A Comparative Study Between Panoramic Radiography and Cone Beam Computed Tomography
Provedor de dados: 77
Autores: Couto-Filho,Carlos Eduardo Gomes do; Moraes,Paulo Hemerson de; Alonso,Maria Beatriz Carrazzone; Haiter-Neto,Francisco; Olate,Sergio; Albergaria-Barbosa,José Ricardo de.
Dental implant and chin osteotomy are executed on the mandible body and the mental nerve is an important anatomical limit. The aim of this research was to know the position of the mental nerve loop comparing result in panoramic radiography and cone beam computed tomography. We analyzed 94 hemimandibles and the patient sample comprised female and male subjects of ages ranging from 18 to 52 years (mean age, 35 years) selected randomly from the database of patients at the Division of Oral Radiology at Piracicaba Dental School State University of Campinas; the anterior loop (AL) of the mental nerve was evaluated regarding the presence or absence, which was classified as rectilinear or curvilinear and measurement of its length was obtained. The observations...
Tipo: Journal article
Palavras-chave: Panoramic radiography; Cone-beam computed tomography; Mental nerve loop.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100051

Accuracy of Palate Shape as sex Indicator in Human Skull with Maxillary Teeth Loss
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Zavando Matamala,Daniela Alejandra; Smith,Ricardo Luiz.
In forensic medicine, diagnosis of sex is the first step in the identification of human skulls. A first approximation is carried out via the qualitative analysis of a series of morphological indicators of sexual dimorphism. Classical studies (Krogman &amp;amp; Iscan, 1986) described 14 indicators for the diagnosis of sex with an accuracy of 90%, and one of these indicators is the shape of the palate. This study analyzed the effect of the loss of teeth on the accuracy of the diagnosis of sex in Brazilians adult skulls, using the shape of the palate as an indicator. We used 98 skulls of adult Brazilians, comprising 35 females and 63 males with an average age of 39.3 years (SD 7.8). The skulls were classified into two groups, namely the fully edentulous...
Tipo: Journal article
Palavras-chave: Sexual Dimorphism; Sex determination; Palate; Tooth loss.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400034

Aceptación diferenciada de alimentos transgénicos de origen vegetal y animal en la Región de La Araucanía, Chile
Provedor de dados: 118
Autores: Schnettler,Berta; Sepúlveda,Oriana; Ruiz,Danilo.
Sobre la base del debate generado por los alimentos genéticamente modificados, particularmente respecto de los alimentos transgénicos (AT), en los países desarrollados, se determinó la importancia de esta variable en la compra de leche líquida y salsa de tomate en consumidores de Temuco (Región de La Araucanía, Chile) y la existencia de diferentes segmentos de mercado, mediante una encuesta a 400 personas. Utilizando análisis conjunto se determinó que la existencia de modificación genética (MG) fue más importante que la marca y el precio en ambos alimentos. Mediante análisis de conglomerados se distinguieron cinco Grupos, dos de ellos con el 46,8 y 18,8% del total de encuestados. Estos dos Grupos mas numerosos dieron importancia a la existencia de MG, pero...
Tipo: Journal article
Palavras-chave: Alimentos genéticamente modificados; Alimentos transgénicos; Análisis de conjunto; Análisis de conglomerados; Ingeniería genética; Mercadeo.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200006

ACERCA DE LA DIATOMEA DIDYMOSPHENIA GEMINATA (LYNGBYE) M. SCHMIDT: SU MORFOLOGÍA Y DISTRIBUCIÓN EN CHILE
Provedor de dados: 73
Autores: Rivera,Patricio; Basualto,Silvia; Cruces,Fabiola.
The freshwater diatom Didymosphenia geminata was studied from Chilean material collected in Río Espolón and Río Bío-Bío using light and electron microscopy. Its principal morphological features are described and illustrated for the first time and comments about its relationships with other closely taxa, as well as its distribution in Chile, are given.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100015

ACERCA DE LAS PRESENTACIONES EN EL VII SIMPOSIO-TALLER DE ICTIOLOGIA
Provedor de dados: 72
Autores: Pequeño,Germán.
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100017

Acidobacteria appear to dominate the microbiome of two sympatric Caribbean Sponges and one Zoanthid
Provedor de dados: 48
Autores: O'Connor-Sánchez,Aileen; Rivera-Domínguez,Adán J; De los Santos-Briones,César; López-Aguiar,Lluvia K; Peña-Ramírez,Yuri J; Prieto-Davo,Alejandra.
BACKGROUND: Marine invertebrate-associated microbial communities are interesting examples of complex symbiotic systems and are a potential source of biotechnological products. RESULTS: In this work, pyrosequencing-based assessment from bacterial community structures of sediments, two sponges, and one zoanthid collected in the Mexican Caribbean was performed. The results suggest that the bacterial diversity at the species level is higher in the sediments than in the animal samples. Analysis of bacterial communities' structure showed that about two thirds of the bacterial diversity in all the samples belongs to the phyla Acidobacteria and Proteobacteria. The genus Acidobacteriumappears to dominate the bacterial community in all the samples, reaching almost...
Tipo: Journal article
Palavras-chave: Marine-invertebrate microbiome; 16S rRNA pyrotags; Mexican Caribbean; Sponge-microbiome; Zoanthid-microbiome; Marine sediments-microbiome.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100061

ACKNOWLEDGMENTS
Provedor de dados: 97
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000400011

ACOUSTIC REMOTE SENSING OF LARGE-SCALE TEMPERATURE VARIABILITY IN THE NORTH PACIFIC OCEAN
Provedor de dados: 72
Autores: Worcester,Peter F.; Cornuelle,Bruce D.; Dushaw,Brian D.; Dzieciuch,Matthew A.; Howe,Bruce M.; Menemenlis,Dimitris; Mercer,James A.; Munk,Walter H.; Spindel,Robert C.; Stammer,Detlef; Zarnetske,Michael.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300047

Acromial Morphology and Subacromial Architecture in a South African Population
Provedor de dados: 77
Autores: Naidoo,N; Lazarus,L; Osman,S. A; Satyapal,K. S.
The acromion is classically described as one of the three scapular processes. Its antero-inferior aspect has been identified as the prime region of rotator cuff pathology. The purpose of this study was to determine the morphologic state of the acromion and the relative subacromial architecture within a South African population. The sample series comprised the morphological observation of one hundred and eighty-two scapulae specimens (n= 182). The classification scheme as stated by Bigliani et al. (1986) was employed. The morphometric architecture of the subacromial space was also investigated (n= 120). (a) Acromial Type: (i) Type I (flat inferior surface) 34.6%; (ii) Type II (curved inferior surface) 51.1%; (iii) Type III (hooked inferior surface) 14%. (b)...
Tipo: Journal article
Palavras-chave: Acromion; Morphology; Subacromial architecture; Morphometry.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300002

Acromial Morphometric Analysis Using Imaging Software
Provedor de dados: 77
Autores: Crahim,Lucas Fernandes; Nagato,Akinori Cardozo; Rocha,Carolina de Lourdes Julião Vieira; Silva,Marco Aurélio dos Santos; Bandeira,Ana Carla Balthar; Ferreira,Tereza Aparecida; Bezerra,Frank Silva.
The aim of this study was to accurately measure acromial morphology in order to describe the anatomical patterns of its subtypes and to conduct a survey of the literature regarding the relationships between morphological subtypes and their related diseases. We photographed scapulae from the Institute of Anatomy, University Severino Sombra, and analyzed the images using Image-J Software®. The average acromial angle was 139.23° ± 2.781, with no significant difference between the right and left sides. There was a positive correlation between the acromial angle and the angle of the spine of the scapula. The correlation mentioned above plays an important role in disorders of the shoulder-particularly impingement syndrome-which reinforces the importance of...
Tipo: Journal article
Palavras-chave: Acromial morphology; Acromioclavicular; Impingement syndrome; Morphometry.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100053

ACROMYRMEX LOBICORNIS EMERY 1887 (HYMENOPTERA:FORMICIDAE) Y EL PESO DE LA CARGA, EN CONDICIONES DE LABORATORIO
Provedor de dados: 72
Autores: Quirán,Estela M.; Steibel,Juan P.
Las hormigas cortadoras de hojas de los géneros Atta Fabricius y Acromyrmex Mayr de la tribu Attini, son eficientes cosechadoras. Se ha observado que las obreras forrajeadoras de estas hormigas cosechan frecuentemente fragmentos de hojas que se corresponden con el peso de las hormigas. En este trabajo se evalúa la relación entre el peso de la carga transportada por individuos de Acromyrmex lobicornis Emery 1887, con el peso de la hormiga, a dos diferentes distancias desde el nido, en condiciones de laboratorio. Según los resultados, se determinó que el peso de la carga transportada está asociado con el peso de la hormiga, ya que las hormigas más grandes llevaron cargas más pesadas. A mayores distancias esta relación lineal se debilita. Se concluye que la...
Tipo: Journal article
Palavras-chave: Hormigas cortadoras; Acromyrmex lobicornis; Peso carga; Peso corporal.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200002

Acrosin release and acrosin activity during incubation in capacitating media using fresh and frozen-thawed dog sperm
Provedor de dados: 48
Autores: de los Reyes,Mónica; Palomino,Jaime; Martínez,Víctor; Aretio,Carolina; Gutiérrez,Michel.
We evaluated the effect of time and temperature on acrosin release from the acrosomal cap and the activity of this enzyme during in vitro capacitation in fresh and frozen/thawed dog sperm. Sperm-rich fractions of six ejaculates from three dogs were processed as fresh and frozen samples. Each sperm sample was incubated in canine capacitation medium (CCM) for 0, 1, 2 and 3 h at 20°C and at 37°C. After incubation, the samples were assessed by the indirect immunofluorescent staining technique. The probability of having unlabeled sperm (PUS), indicating acrosin loss, was modelled by a binomial distribution using logistic regression. There was a linear relationship between PUS and time at both temperatures (p&lt;0.001); however, a major percentage of unlabeled...
Tipo: Journal article
Palavras-chave: Acrosin; Capacitation; Dog sperm; Cryopreservation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000200005

Action of Trivalent Chromium on Rat Liver Structure. Histometric and Haematological Studies
Provedor de dados: 77
Autores: Silva,Rogério Ferreira da; Lopes,Ruberval A; Sala,Miguel A; Vinha,Dionísio; Regalo,Simone C. H.; Souza,Ana Maria de; Gregório,Zita Maria de O.
The trace mineral trivalent chromium (Cr3+) is an essential nutrient involved in the regulation of carbohydrate, lipid and protein metabolism via an enhancement of insulin action. The present work had as objective to characterize histopathologically and histometrically the hepatic alterations of female Wistar rats, determined by the chromium III administration in drinking water. Adult rats received ration and drinking water ad libitum containing 300 or 500 mg/l chromium III during 4 months. Control animals received only water and ration. All animals were sacrificed by lethal dose of anesthetic. Samples of liver were fixed in 10% formalin for 24 h. Tissues for microscopical pathology were processed using standard procedures. Paraffin sections prepared at 6...
Tipo: Journal article
Palavras-chave: Liver; Rat; Chromium; Morphometry; Hematology.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300014

Activation of group II metabotropic glutamate receptors blocks zinc release from hippocampal mossy fibers
Provedor de dados: 48
Autores: Matias,Carlos M; Dionísio,Jose C; Saggau,Peter; Quinta-Ferreira,Maria Emilia.
BACKGROUND: The hippocampal CA3 area contains large amounts of vesicular zinc in the mossy fiber terminals which is released during synaptic activity, depending on presynaptic calcium. Another characteristic of these synapses is the presynaptic localization of high concentrations of group II metabotropic glutamate receptors, specifically activated by DCG-IV. Previous work has shown that DCG-IV affects only mossy fiber-evoked responses but not the signals from associational-commissural afferents, blocking mossy fiber synaptic transmission. Since zinc is released from mossy fibers even for single stimuli and it is generally assumed to be co-released with glutamate, the aim of the work was to investigate the effect of DCG-IV on mossy fiber zinc signals....
Tipo: Journal article
Palavras-chave: Zinc; Neurotransmission; Glutamatergic; Co-release; Metabotropic fluorescence; Inhibition.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100067

Active anti-acetylcholinesterase component of secondary metabolites produced by the endophytic fungi of Huperzia serrata
Provedor de dados: 69
Autores: Wang,Zhejian; Ma,Zhao; Wang,Lili; Tang,Chengchen; Hu,Zhibi; Chou,GuiXin; Li,Wankui.
Background An endophytic fungus lives within a healthy plant during certain stages of, or throughout, its life cycle. Endophytic fungi do not always cause plant disease, and they include fungi that yield different effects, including mutual benefit, and neutral and pathogenic effects. Endophytic fungi promote plant growth, improve the host plant's resistance to biotic and abiotic stresses, and can produce the same or similar biologically active substances as the host. Thus, endophytic fungal products have important implications in drug development. Result Among the numerous endophytic fungi, we identified two strains, L10Q37 and LQ2F02, that have anti-acetylcholinesterase activity, but the active compound was not huperzine A. The aim of this study was to...
Tipo: Journal article
Palavras-chave: Anti-acetylcholinesterase activity; Acetylcholinesterase inhibitor; Biological characteristics; Endophytic fungi.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600003

Actividad biológica del suelo en dos bosques de Nothofagus del centro sur de Chile
Provedor de dados: 73
Autores: Rivas,Yessica; Godoy,Roberto; Valenzuela,Eduardo; Leiva,Javier; Oyarzún,Carlos; Alvear,Marysol.
Los bosques templados prístinos del sur de Chile tienen un bajo ingreso de nitrógeno (N) vía depositación atmosférica, por lo que la productividad del ecosistema depende principalmente del reciclaje interno de nutrientes, contenido en la materia orgánica del suelo (MOS). Se postula que existen diferencias en la actividad biológica del suelo entre un bosque secundario de Nothofagus obliqua de la Depresión Intermedia en Chile, influenciado por la actividad agrícola-ganadera y condiciones microclimáticas templadas favorables para la descomposición de la MOS, al comparar con un bosque prístino de Nothofagus betuloides de la Cordillera de los Andes, con microclima extremo. El presente estudio compara la tasa de mineralización de carbono (C-min), N (N-min) y las...
Tipo: Journal article
Palavras-chave: Bosque templado; C- mineralización; N- mineralización; Dehidrogenasas; Fosfatasa ácida.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100008

ACTIVIDAD CONTRACTIL DEL MUSCULO PAPILAR CARDIACO Y CONDUCTO DEFERENTE DE RATA INDUCIDA POR VENENO DE LA ARAÑA LATRODECTUS MACTANS DE CHILE
Provedor de dados: 72
Autores: Romero,Fernando; Altier,Elena; Quiñehua,Carlos; Cayuqueo,Alejandr.
La araña Latrodectus mactans al morder inocula su veneno, el cual induce un cuadro clínico denominado latrodectismo sistémico, del que se desconocen sus efectos en tejidos aislados. Nuestro laboratorio ha obtenido veneno de esta especie de arácnido mediante la técnica de extracción de glándula, lo que permitió iniciar estudios de la reactividad muscular inducida por extracto de glándula y una fracción purificada bioactiva sobre músculo liso, utilizando como modelo preparaciones de músculo aislado papilar cardiaco y conducto deferente de rata. Los resultados muestran que estas toxinas generan un efecto miotónico en el tejido muscular liso del conducto deferente y en el tejido cardiaco inducen inotropismo positivo y aumento de la frecuencia de contracción....
Tipo: Journal article
Palavras-chave: Araña viuda negra; Latrodectus mactans de Chile; Músculo cardiaco; Conducto deferente; Contracción.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200006

ACTIVIDAD DE LA LACTICO DEHIDROGENASA (LDH) EN EMERITA ANALOGA (STIMPSON 1857) CRUSTACEA, HIPPIDAE
Provedor de dados: 72
Autores: Hernández,Klaudia L.; González,Rodrigo R.; Quiñones,Renato A.
Emerita analoga (Stimpson 1857) habita en la zona infralitoral de playas arenosas, desarrollando intensa movilidad en la zona de barrido y embate de las olas. Su habilidad motriz, reflejada en una constante actividad muscular explosiva, sugiere una alta actividad glicolítica (fermentativa) complementaria a la fosforilación oxidativa. En este trabajo se determinó la actividad específica aparente de la láctico dehidrogenasa (LDH EC 1.1.1.27) de E. analoga como indicador de hipoxia funcional. Además, se estudió el efecto del peso y del pH sobre la actividad LDH, así como en los valores aparentes de sus parámetros cinéticos (Vmax y Km). Los resultados indican que los organismos grandes ( a 1,5) y pequeños (&lt; a 1,5 mm) de E. analoga, se ajustan a una curva...
Tipo: Journal article
Palavras-chave: Emerita analoga; Metabolismo anaeróbico; Láctico dehidrogenasa; LDH; Actividad de la LDH; Alometría.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100009

Actividad de visita de Bombus dahlbomi (Guérin)y Bombus ruderatus (F.) (Hymenoptera:Apidae) sobre Trébol Rosado (Trifolium pratense L.) en la IX Región de la La Araucanía, Chile
Provedor de dados: 113
Autores: Rebolledo R.,Ramón; Martínez P.,Héctor; Palma M.,Rubén; Aguilera P,Alfonso; Klein K.,Carlos.
En la temporada 1998/99 se estudió en las localidades de Gorbea y Nueva Imperial de la IX Región de La Araucanía, la acción polinizadora de los abejorros Bombus dahlbomi y Bombus ruderatus sobre semilleros de trébol rosado (Trifolium pratense L.). Durante la temporada 1999/2000 se registró la distribución, abundancia relativa y la longitud de la probóscide de ambas especies, las que se encuentran ampliamente distribuidas en la Región, con abundancias relativas de un 58,8 y 41,2% respectivamente. Se observó una mayor actividad polinizadora en los intervalos de la mañana y de la tarde, destacándose B. ruderatus por visitar un mayor número de flores por inflorescencia y ocupar más tiempo que B. dahlbomi en esta labor. Se constató la preferencia de esta última...
Tipo: Journal article
Palavras-chave: Bombus ruderatus; Bombus dahlbomi; Trifolium pratense; Polinización.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000300004

Actividad enzimática de metanótrofos marinos y su uso potencial en biorremediación
Provedor de dados: 72
Autores: Inostroza,Agar A; Pantoja,Silvio; González,Rodrigo R.
Los metanótrofos son microorganismos con un importante rol en la biogeoquímica del metano en el océano. La enzima metano monooxigenasa soluble (MMOs) es la encargada de realizar la primera oxidación catabólica del metano, pero además es activa sobre compuestos aromáticos policíclicos y una gran variedad de substancias derivadas del petróleo consideradas como contaminantes. Muestras de sedimento fueron incubadas en medio líquido específico con sales minerales de nitrato (NMS) y en presencia de metano como única fuente de carbono para determinar la actividad de MMOs de la comunidad de metanotrófos presentes en esta matriz ambiental. Las muestras fueron obtenidas desde un área con una emanación visible de metano (Isla Mocha) y de dos áreas sin emanación...
Tipo: Journal article
Palavras-chave: Hidrocarburos aromáticos; Isla Mocha; Metano; Metano monooxigenasa soluble (MMOs).
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200002

Actividad insecticida del aceite esencial de Lepechinia chamaedryoides (Balb.) Epling en Drosophila melanogaster
Provedor de dados: 73
Autores: SUAZO F,GONZALO; GONZÁLEZ M,FlDELINA; URBINA P,ANGÉLICA; PASTENE N,EDGAR; SÁEZ C,KATIA; SERRI G,HUMBERTO; CHÁVEZ E,RUTH.
Se evaluó el efecto insecticida de tres extractos de la planta endémica de Chile, Lepechinia chamaedryoides (Balb.) Epling (extracto polar, exudado resinoso y aceite esencial), sobre larvas del díptero Drosophila melanogaster Meigen con el fin de determinar cuál o cuáles de éstos poseen actividad biológica insecticida. El bioensayo se realizó sobre la base de un diseño experimental completamente aleatorio, con 15 tratamientos y tres repeticiones, que contempló el estudio de variables de mortalidad y de concentración letal 50 % (CL50) y 90 % (CL90), y observación de organismos mediante lupa, microscopía óptica y microscopía electrónica de transmisión. Se registró una mortalidad mayor al 90 % en cuatro concentraciones evaluadas del aceite esencial. En el...
Tipo: Journal article
Palavras-chave: Efecto insecticida; Bioensayo; Plantas nativas; Aceite esencial.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200005

ACTIVIDAD MICROBIANA EN UN SUELO DE ORIGEN VOLCANICO BAJO DISTINTO MANEJO AGRONÓMICO
Provedor de dados: 113
Autores: Zagal,Erick; Rodríguez,Nicasio; Vidal,Iván; Quezada,Lorena.
La actividad microbiana en un suelo de origen volcánico del Valle Central (Typic Melanoxerand) fue medida al término de un experimento de 7 años de duración en 6 rotaciones con distinto manejo agronómico e intensidad de uso del suelo. Muestras no alteradas de este suelo fueron incubadas en laboratorio por 30 días bajo condiciones controladas de temperatura (25ºC) y humedad. El C-CO2 mineralizado se determinó cada 10 días, y la mineralización de N-inorgánico, cuantificando su incremento, entre el día 0 y 30. Paralelamente, se midió carbono (C) orgánico en muestras compuestas del mismo ensayo. La cuantificación de C-CO2 mineralizado fue efectivamente más sensible que la medición de C orgánico a los tratamientos de rotación y evidenció tempranamente cambios...
Tipo: Journal article
Palavras-chave: C-mineralizado; Calidad de suelo; N-mineralizado; Rotaciones.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000200012

ACTIVIDAD RESPIRATORIA EN EL HORIZONTE ORGANICO DE SUELOS DE ECOSISTEMAS FORESTALES DEL CENTRO Y SUR DE CHILE
Provedor de dados: 73
Autores: Carmona,Martín R; Aguilera,María; Pérez,Cecilia A.; Serey,Italo.
El mantillo del suelo (horizontes Oi y Oe) de ecosistemas boscosos es utilizado como hábitat, fuente de nutrientes y energía para una gran diversidad de organismos. Ocurre, en consecuencia, un flujo de carbono (C) desde el detritus debido a la producción de CO2 por respiración de la biota. En este trabajo se midió y comparó la actividad respiratoria en condiciones de laboratorio de muestras de mantillo, colectadas en tres tipos de bosques del centro y sur de Chile: bosque Nordpatagónico (Nothofagus), bosque Siempreverde de Coníferas (Fitzroya) y bosque Esclerófilo (Cryptocarya). Las muestras de este último se separaron en tres fracciones de tamaño de partículas (&gt;2,4; 2,4-1,2 y &lt; 1,2 mm), con el fin de poner a prueba la hipótesis de la constancia de...
Tipo: Journal article
Palavras-chave: Decomposition; Leaf litter; C-CO2 evolution; Temperate forests.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100001

ACTIVIDADES BIOLÓGICAS Y ESTABILIDAD DE AGREGADOS EN UN SUELO DEL BOSQUE TEMPLADO CHILENO BAJO DOS ETAPAS SUCESIONALES Y CAMBIOS ESTACIONALES
Provedor de dados: 127
Autores: Alvear,Marysol; Urra,Cecilia; Huaiquilao,Rodrigo; Astorga,Marcia; Reyes,Francisco.
La actividad microbiana es afectada por variables ecológicas primarias, tales como la densidad y composición de la flora, etapa sucesional y variables secundarias, como las estaciones del año. Dentro de las actividades biológicas del suelo las más importantes están relacionadas con la materia orgánica (MO) y el ciclado de nutrientes, las que nos permiten detectar, junto a otros parámetros físicos del suelo, cambios tempranos en su bioquímica, grado de compactacion de suelos y actividades biológicas producidas por el impacto antrópico. En este estudio cuantificamos y comparamos un número de actividades biológicas y el porcentaje de agregados estables al agua bajo dos etapas sucesionales y dos estaciones de crecimiento en un bosque templado del centro-sur de...
Tipo: Journal article
Palavras-chave: Indicadores biológicos tempranos; Suelos bajo bosque nativo; Etapas sucesionales.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000300004

Actividades Prácticas en Anatomía: Factor Nivelador de los Contrastes de Origen entre los Alumnos de Medicina
Provedor de dados: 77
Autores: Inzunza,Oscar; Schneeberger,Daniela; Salgado,Guillermo; Cantín,Mario.
Las mediciones de los logros educacionales y las pruebas de selección de ingreso a la educación superior están fuertemente correlacionadas con los antecedentes socioeconómicos y el tipo de establecimiento educacional del postulante, situación que representaría un factor predictor del rendimiento para los alumnos de primer año universitario. Considerando que los puntajes de ingreso para la carrera de medicina presentan una diferencia significativa entre los primeros y últimos seleccionados, nos preguntamos si existe algún factor nivelador que reduzca esa brecha de origen. Se analiza el rendimiento en las evaluaciones prácticas y pruebas teóricas, al comienzo y al final del año académico 2009 comparando los primeros y últimos seleccionados de acuerdo al...
Tipo: Journal article
Palavras-chave: Educación médica; Estudiantes de medicina; Aprendizaje médico; Ecoe; Osce.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200018

Activities of different types of Thai honey on pathogenic bacteria causing skin diseases, tyrosinase enzyme and generating free radicals
Provedor de dados: 48
Autores: Jantakee,Kanyaluck; Tragoolpua,Yingmanee.
BACKGROUND: Honey is a natural product obtained from the nectar that is collected from flowers by bees. It has several properties, including those of being food and supplementary diet, and it can be used in cosmetic products. Honey imparts pharmaceutical properties since it has antibacterial and antioxidant activities. The antibacterial and antioxidant activities of Thai honey were investigated in this study. RESULTS: The honey from longan flower (source No. 1) gave the highest activity on MRSA when compared to the other types of honey, with a minimum inhibitory concentration of 12.5% (v/v) and minimum bactericidal concentration of 25% (v/v). Moreover, it was found that MRSA isolate 49 and S. aureus were completely inhibited by the 50% (v/v) longan honey...
Tipo: Journal article
Palavras-chave: Anti-bacterial activity; Pathogenic bacteria; Anti-free radicals; Anti-tyrosinase.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100004

Activity and population characteristics of Andean Condors in southern Chile
Provedor de dados: 97
Autores: SARNO,RONALD J.; FRANKLIN,WILLIAM L.; PREXL,WALTER S.
Data were collected on general activity patterns and population characteristics of free-ranging Andean Condors Vultur gryphus in Torres del Paine National Park, Chile from July 1992 to June 1994 during 3,680 h of observation. Seasonal differences were evident in relative abundance and activity patterns. The mean number of condors sighted/ observation significantly higher in fall-winter than in spring-summer. There was a significant decrease from spring-summer to fall-winter in the percentage of observations during which we sighted solitary condors and a significant increase in the number of groups of condors. In addition, mean monthly maximum group size was significantly larger in fall-winter than spring-summer. The sex ratio (males:females ) of juveniles...
Tipo: Journal article
Palavras-chave: Andean Condor; Activity; Patagonia; Sex ratio.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100001

Activity budget patterns in family-group and solitary territorial male guanacos
Provedor de dados: 97
Autores: YOUNG,JULIE K.; FRANKLIN,WILLIAM L.
We observed behavioral patterns of territorial male guanacos (Lama guanicoe) in Torres del Paine National Park, Chile. Both solo territorial males and family-group territorial males were observed to compare the activity time budgets of males (n = 23) in different social groups and habitats. We found no difference in the activity time budgets of males based on social group type, total number of females or all guanacos present, or age of territorial males. Males, in all categories, spent most of their time foraging (65 % of overall time budget). There was a significant difference in time spent in aggressive and in miscellaneous (defecation, alertness to observer, scratching) activities based on habitat type; most aggressive encounters and miscellaneous...
Tipo: Journal article
Palavras-chave: Guanaco; Activity budget; Territorial behavior; Resource-defense.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400005

Activity patterns by two colour morphs of the vulnerable guiña, Leopardus guigna (Molina 1782), in temperate forests of southern Chile
Provedor de dados: 72
Autores: HERNÁNDEZ,FELIPE; GÁLVEZ,NICOLÁS; GIMONA,ALESSANDRO; LAKER,JERRY; BONACIC,CRISTIÁN.
Here we provide the first analysis of activity patterns exhibited by spotted and melanistic colour morphs of the vulnerable guiña Leopardus guigna, in a forest landscape of southern Chile. Camera traps showed guiñas were mainly active at night (64% of photos). Melanistic guiñas were more nocturnal (82% of photos) than the more common spotted cats (57%). Spotted guiñas were more active on cloudy and moonless nights. Our study provides novel findings about the behavioural plasticity of guiña in different ambient conditions, and the relative advantage to each colour morph to persist in an increasingly human-dominated landscape.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100010

Actualización de las Ecorregiones Terrestres de Perú propuestas en el Libro Rojo de Plantas Endémicas del Perú
Provedor de dados: 73
Autores: Britto,Berni.
RESUMEN En el 2007 se publicó el Libro Rojo de las Plantas Endémicas del Perú, donde se presentó una nueva propuesta de ecorregiones terrestres para el país. Las 13 ecorregiones propuestas no llegaron a ser descritas en su totalidad, ni representadas en un mapa. En este artículo se presenta la interpretación y actualización de las ecorregiones propuestas en el 2007, así como las modificaciones subsecuentes a las mismas, con base en los nuevos avances del conocimiento de la flora peruana y sudamericana, y los recursos informáticos disponibles actualmente. Las 15 nuevas ecorregiones propuestas son contrastadas con anteriores planteamientos de ecorregiones que han sido empleadas para describir el territorio peruano.
Tipo: Journal article
Palavras-chave: Ecorregiones; Límites altitudinales; Perú; Flora; Endemismo.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100015

Actualización sistemática y distribución geográfica de Mutisioideae (Asteraceae) de Chile
Provedor de dados: 73
Autores: Moreira-Muñoz,Andrés; Morales,Vanezza; Muñoz-Schick,Mélica.
Se presenta una actualización sistemática y de distribución geográfica de las especies y categorías infraespecíficas de la subfamilia Mutisioideae (tribus Mutisieae, Nassauvieae y Onoserideae) para Chile. El trabajo fue realizado sobre la base de bibliografía y la revisión de ejemplares principalmente de los herbarios SGO y CONC. Los resultados arrojan la presencia de 28 géneros, 192 especies y otros 22 taxones infraespecíficos en Chile. Siete de estos géneros, 77 especies y 12 taxones infraespecíficos tienen carácter de endémicos para el país. La revisión arroja dos adiciones y dos sustracciones a la flora de Chile. Adicionalmente, 47 de los taxones han sido corregidos en cuanto a su distribución geográfica por región en Chile. Se discute finalmente las...
Tipo: Journal article
Palavras-chave: Asteraceae; Chile; Compositae; Diversidad; Endemismo; Mutisieae; Nassauvieae; Onoserideae.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100003

Acumulación de aminoácidos tipo micosporina (MAAs): biosíntesis, fotocontrol y funciones ecofisiológicas
Provedor de dados: 97
Autores: KORBEE,NATHALIE; FIGUEROA,FÉLIX L; AGUILERA,JOSÉ.
Los efectos nocivos que inducen la radiación UV en organismos acuáticos pueden ser aminorados a través de varios mecanismos de fotoprotección entre los que se encuentran la acumulación de sustancias que absorben radiación UV (fotoprotectores) y activación de sistemas antioxidantes. Entre los fotoprotectores descritos se encuentran los aminoácidos tipo micosporina (MAAs). En esta revisión se enfatiza sobre la capacidad fotoprotectora y antioxidante de estas sustancias. La función fotoprotectora de los MAAs puede deducirse de las características fotofísicas de estos compuestos. Es sabido que actúan como pantalla pasiva disipando térmicamente la energía UV absorbida. La acumulación de MAAs se induce tanto por radiación UV (UV-A y UV-B) como por luz azul...
Tipo: Journal article
Palavras-chave: Aminoácidos tipo micosporina; Fotoprotección; Nitrógeno; Radiación fotosintética; Radiación UV.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000100010

Acumulación de cobre en una comunidad vegetal afectada por contaminación minera en el valle de Puchuncaví, Chile central
Provedor de dados: 97
Autores: GONZÁLEZ,ISABEL; MUENA,VICTORIA; CISTERNAS,MAURICIO; NEAMAN,ALEXANDER.
Las especies hiperacumuladoras son capaces de acumular más de 1.000 mg kg-1 de metal en su biomasa aérea y son útiles en procesos de fitoextracción de metales en suelos contaminados por actividades mineras. Con el fin de identificar especies hiperacumuladoras representativas de las condiciones chilenas, se realizó una prospección dentro de la diversidad vegetal en el área afectada por las emisiones de la Fundición Ventanas (90-900 mg kg-1 de Cu total en suelos), así como en un área cercana a una pila de escorias de fundición (500-3.000 mg kg-1 de Cu total en suelos). Se determinaron las concentraciones de Cu en la biomasa aérea de las plantas. Los resultados indican que dentro de la diversidad del sitio existen al menos veintidós especies...
Tipo: Journal article
Palavras-chave: Oenothera affinis; Metalofitas; Cobre; Fitoextracción.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000200010

Acumulación de compuestos nitrogenados en relación al problema de baya blanda en uva de mesa
Provedor de dados: 113
Autores: Ruiz S.,Rafael; Moyano A.,Stella; Navia P.,Tania.
Con el objeto de evaluar la probable incidencia de trastornos del metabolismo del N en el problema denominado "baya blanda" de la vid (Vitis vinifera L.), a inicio de la cosecha 2002 se recolectaron muestras de bayas y raquis de racimos procedentes de un parronal Vitis vinifera L. cv. Thompson Seedless de la VI Región, Chile (34º15’ lat. Sur, 72º25’ long. Oeste) con presencia de bayas "blandas", "intermedias" y "firmes". Los análisis indicaron que las bayas incluidas en las categorías blanda y/o intermedia presentaron una concentración mayor de N en la pulpa y en la piel, mayores niveles de arginina y de putrescina. Evaluaciones en la fruta indicaron que las bayas blandas presentaron además menor firmeza (menos de 190 g-fuerza mm-1), menor peso y menor...
Tipo: Journal article
Palavras-chave: Putrescina; Desórdenes fisiológicos; Nitrógeno; Arginina; Firmeza de bayas; Vitis vinifera; Palo negro.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000400012

Acute Contact Toxicity Test of Oxalic Acid on Honeybees in the Southwestern Zone of Uruguay
Provedor de dados: 117
Autores: Carrasco-Letelier,Leonidas; Mendoza,Yamandu; Ramallo,Gustavo.
This work studies the acute contact toxicity of oxalic acid (OA) on a honeybee polyhybrid subspecies (Apis mellifera), which is the dominant biotype in southwestern zone of Uruguay (SWZU) and the country's most important honey-producing region. We determined the mean lethal dose (LD50), as well as the no observed effect level (NOEL) and the lowest observed effect level (LOEL) values. We also estimated the total number of honeybees per hive in the test area. The aim was to assess the relationship between the maximum OA dose used in Uruguay (3.1 g OA per hive) and the toxicological parameters of honeybees from SWZU. The current dose of 3.1 g OA per hive corresponds to 132.8 OA per honeybee since determined NOEL is 400 OA per honeybee; our results indicate...
Tipo: Journal article
Palavras-chave: LD50; Uruguay.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200019

Acute Effects of Sulphur Mustard Gas on the Number of Lymphocytes in the Rat's Spleen
Provedor de dados: 77
Autores: Mehrdad,Jahanshahi; Bahadoran,H; Asadi,M. H.
Sulphur mustard (SM), commonly known as mustard gas is an alkylating agent that causes serious blisters upon contact with human skin. SM is frequently used as a chemical warfare agent. There is some evidence for sulfur mustard-induced lymph system effects in humans. Between 2000-2001, 42 male albino Wistar rats were used. After accommodation with environment, we divided rats to control, sham and experimental groups (2.5 mg/kg, 5 mg/kg, 10 mg/kg, 20 mg/kg and 40 mg/kg). Then we injected sulphur mustard oil in rat's intraperitoneal space. Then their spleens were removed for histological verification. Our results showed that significant difference in lymphocytes number in experimental groups after 24 hours. The number of lymphocytes in 5, 10, 20 and 40 mg/kg...
Tipo: Journal article
Palavras-chave: Mustard gas; Lymphocytes; Spleen.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200031

Acute oral toxicity and anti-inflammatory activity of hydroalcoholic extract from Lampaya medicinalis Phil in rats
Provedor de dados: 48
Autores: Morales,Glauco; Paredes,Adrián; Olivares,Alberto; Bravo,Jaime.
BACKGROUND: Algesia and inflammation are related with several pathological conditions. It is known that many drugs available for the treatment of these problems cause unwanted side effects. This study was aimed at evaluating acute toxicity and anti-inflammatory activity of Lampaya medicinalis Phil. (Verbenaceae) widely used in the folk medicine of Northern Chile against rheumatism, arthritis and body joints pain. RESULTS: Oral administration of hydroalcoholic extract (HAE) at the highest dose of 3000 mg/ Kg body weight resulted in no mortalities or evidence of significant behavioral changes. Histological examination revealed normal architecture and no significant adverse effects were observed on the liver, kidney, heart, lung or ovaries and testicles. The...
Tipo: Journal article
Palavras-chave: Lampaya medicinalis; Hydroalcoholic extract; Acute oral toxicity; Histology; Hematology; Anti-inflammatory; Carrageenan.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100006

Adaptability and Genotype x Environment Interaction of Spring Wheat Cultivars in Chile using Regression Analysis, AMMI, and SRAG
Provedor de dados: 117
Autores: Castillo,Dalma; Matus,Iván; del Pozo,Alejandro; Madariaga,Ricardo; Mellado,Mario.
Wheat (Triticum aestivum L.) genetic improvement objectives include obtaining cultivars capable of expressing their maximum potential yield and quality in diverse environments. This make necessary to know and define the environment in which a variety can express its maximum potential yield and quality. The objective of this study was to assess which method is the most efficient to study cultivars response in multiple environments. For this, we analyze the adaptability, stability, and genotype x environment (GxE) interaction effect, grain yield, sedimentation, and wet gluten content of 13 spring wheat cultivars sown in six environments in the central-south and southern zones of Chile during two seasons. The data were analyzed by regression analysis,...
Tipo: Journal article
Palavras-chave: AMMI; SREG; GxE; Bread wheat.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200001

Adaptación, Crecimiento y Producción de Nuevas Leguminosas Forrajeras Anuales en la Zona Mediterránea de Chile: II. Comportamiento de las Especies en Suelos Graníticos del Secano Interior Subhúmmedo
Provedor de dados: 113
Autores: Ovalle M,Carlos; Pozo L,Alejandro del; Avendaño R,Julia; Fernández E,Fernando; Arredondo S,Susana.
Con el objetivo de evaluar la productividad y persistencia de nuevo germoplasma de leguminosas forrajeras anuales, en suelos graníticos degradados del secano interior mediterráneo sub-húmedo de Chile, se realizó un experimento de campo en el Centro Experimental Cauquenes, del Instituto de Investigaciones Agropecuarias (INIA), Chile, entre julio de 2000 y marzo de 2002. Las especies estudiadas fueron Biserrula pelecinus (3 cultivares), Ornithopus compressus (7), O. sativus (2), Trifolium michelianum (1), T. resupinatum (1) y T. vesiculosum (1). Se incluyeron como testigo cultivares de Trifolium subterraneum sensu lato (3) y de Medicago polymorpha (1), puesto que ambas especies son de amplia utilización en la zona de estudio. Se utilizó un diseño de bloques...
Tipo: Journal article
Palavras-chave: Biserrula pelecinus; Ornithopus spp.; Medicago polymorpha; Trifolium subterraneum; T. michelianum; T. resupinatum; T. vesiculosum; Biserrula pelecinus; Ornithopus spp.; Medicago polymorpha; Trifolium subterraneum; T. michelianum; T. resupinatum; T. vesiculosum.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000300004

Adaptación de la Técnica de Impregnación Argéntica de Llombart para la Demostración de Fibras Nerviosas, en Cualquier Tejido en Cortes por Parafina
Provedor de dados: 77
Autores: Rivas Manzano,Patricia; Chavira Ramírez,Carlos Tonatiuh; Ortiz Hernández,Rosario.
En la investigación biológica sigue siendo necesaria la demostración de la inervación periférica en numerosos tejidos y órganos. El objetivo de este trabajo fue rescatar y modernizar uno de los métodos más constantes que hemos probado para demostrar la inervación periférica. La técnica de Llombart para fibras nerviosas se adaptó en cortes por parafina de 7 µm en diferentes tejidos animales. La impregnación argéntica se hizo por goteo en cámara húmeda. Se demostraron en forma constante, precisa y seriada terminaciones nerviosas y corpúsculos sensoriales, neuronas y fibras nerviosas periféricas. A pesar de la alta especificidad para fibras nerviosas, la técnica no compromete el panorama tisular por lo que da bellas imágenes de conjunto. Sin ser una técnica...
Tipo: Journal article
Palavras-chave: Impregnación argéntica; Fibras nerviosas; Inervación periférica; Células argentafines.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300037

Adaptation and Genotype x Environment Interaction of Flaxseed (Linum usitatissimum L.) Genotypes in South Central Chile
Provedor de dados: 117
Autores: Berti,Marisol; Fischer,Susana; Wilckens,Rosemarie; Hevia,Felicitas; Johnson,Burton.
Flaxseed (Linum usitatissimum L.) is imported into Chile mostly for bread making and feed. Identification of genotypes best adapted for seed production in South Central Chile would facilitate producer’s decision. The objective of this study was to determine the adaptation and genotype x environment interaction of 16 flaxseed genotypes (including 10 from North American and six from Argentine sources) grown at 11 environments (defined as location-year) in Chile from 2003 to 2007. Genotype seed yield was above 5700 kg ha-1 for some environments indicating a high yield potential. According to the AMMI (Additive Main Effects and Multiplicative Interaction) and SREG (Sites regression) models the 11 environments were classified into four groups by the AMMI and...
Tipo: Journal article
Palavras-chave: Adaptation; Genotype; Seed yield; Oil content; Linolenic acid.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300001

Additional Muscle Slip of Flexor Carpi Ulnaris Associated with Anomalous Ulnar Nerve and Ulnar Artery in the Distal Forearm
Provedor de dados: 77
Autores: Ramana Vollala,Venkata; Bhat,Seetharama; Rodrigues,Vincent; Prasad,Deepthinath; Pamidi,Narendra.
During routine dissection classes to under gradúate medical students, we observed an anomalous flexor carpi ulnaris muscle associated with abnormal ulnar nerve and ulnar artery in the distal part of forearm. There was an additional belly arising from the lower part of the flexor carpi ulnaris muscle and crossed ulnar nerve and vessels, median nerve and ended in a broad aponeurosis which crossed the tendons of flexor digitorum superficialis and merged with the deep f ascia and flexor retinaculum. The ulnar nerve and ulnar artery divided into their terminal branches in the lower part of the forearm. However, the distribution of the terminal branches of both ulnar nerve and artery were normal. An understanding of these unusual findings may be clinically...
Tipo: Journal article
Palavras-chave: Flexor carpi ulnaris; Ulnar nerve; Ulnar artery.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200019

ADDITIONS TO THE HERPETOLOGICAL CATALOGUE OF THE MUSEO DEL MAR, UNIVERSIDAD ARTURO PRAT, IQUIQUE, CHILE
Provedor de dados: 72
Autores: Moreno,Rodrigo; Ibarra-Vidal,Héctor.
Additions of new species of herpetological fauna to the Herpetological Collection of the Museo del Mar, Universidad Arturo Prat, Iquique, Chile, are documented. The Collection currently contains 56 herpetological species, 16 of which are Amphibia, and 40 of which are Reptilia, both terrestrial and marine. There is a total of 165 specimens, of which approximately 38% are Chilean species
Tipo: Journal article
Palavras-chave: Herpetological catalogue; Chilean herpetofauna; Museo del Mar; Universidad Arturo Prat; Iquique; Chile.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100009

Adenomioepitelioma de la Mama: Reporte de un Caso
Provedor de dados: 77
Autores: Tapia E,Oscar.
El adenomioepitelioma es un infrecuente tumor de la mama, conformado por una proliferación bifásica de células epiteliales y mioepiteliales. Presentamos las características clínicas y morfológicas de un caso de adenomioepitelioma benigno diagnosticado en una paciente de 34 años en la Unidad de Anatomía Patológica del Hospital Hernán Henríquez Aravena de Temuco.
Tipo: Journal article
Palavras-chave: Neoplasia de mama; Adenomioepitelioma; Células mioepiteliales.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300037

ADICIONES A LA FLORA DE MUSGOS DE LA ISLA GRANDE DE CHILOE, CHILE
Provedor de dados: 73
Autores: Larraín,Juan.
Son reportados por primera vez para la Isla Grande de Chiloé 42 especies de musgos, 17 géneros y cuatro familias (Cryphaeaceae, Racopilaceae, Vittiaceae y Daltoniaceae), sobre la base de colecciones del autor en localidades previamente poco exploradas de la Isla y material depositado en el herbario CONC. Once especies extienden sus límites de distribución conocidos en el país y cuatro taxa son citados por primera vez para la X Región. Con estos nuevos registros, la flora muscinal del archipiélago se eleva a 162 especies y tres taxa subespecíficos.
Tipo: Journal article
Palavras-chave: Bryophyta; Musci; Sudamérica; Taxonomía; Nuevos registros.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100002

ADICIONES Y NOTAS A LA FLORA DEL PARQUE NACIONAL LLULLAILLACO, II REGION, CHILE
Provedor de dados: 73
Autores: Marticorena,Alicia; Pardo,Verónica; Peñaloza,Alejandro; Negritto,María A.; Cavieres,Lohengrin A.; Parada,Mario.
Se presentan nuevos registros de 16 especies, 10 géneros y 1 familia para la flora del Parque Nacional Llullaillaco (Región de Antofagasta). Con esto la flora total del parque se eleva a 126 especies, contenidas en 74 géneros y 31 familias. El número de especies endémicas en el PN Llullaillaco se eleva a 21 (16,6%). Este porcentaje de endemismo es uno de los más altos documentados para un parque nacional ubicado en los Andes de Chile. Además, se señalan algunos comentarios nomenclaturales para algunas especies previamente documentadas en otros estudios
Tipo: Journal article
Palavras-chave: Endemismos; Flora altoandina; Nuevas citas.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000200001

Adiponectin Effect on Nitric Oxide Secretion by Normal and Endometriotic Human Endometrial Stromal Cells: in vitro Study
Provedor de dados: 77
Autores: Bohlouli,Somayeh; Khazaei,Mozafar; Rabzia,Arezou; Khazaei,Mohammad Rasool; Sadeghi,Ehsan.
Endometriosis is an estrogen-dependent disease in reproductive age women. Adiponectin and Nitric oxide (NO) have an important role in physiologic functions especially in human reproductive system. Levels of NO increased in the endometriosis patients but serum adiponectin levels decreased in woman with endometriosis. The aim of this study was to determine adiponectin effect on nitric oxide secretion by cultured normal and endometriotic human endometrial stromal cells. In this experimental study, normal (n= 10) and endometriotic endometrial biopsies (n= 10) were taken in sterile condition. Stromal cells isolated and cultured in in DMEM/ F12 medium and treated with adiponectin concentrations (0, 10, 100, and 200 ng/ml) for 24 and 48 hours. NO assay was done...
Tipo: Journal article
Palavras-chave: Adiponectin; Nitric oxide; Endometriosis; Stromal cell.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100053

Administration and Management of Irrigation Water in 24 User Organizations in Chile
Provedor de dados: 117
Autores: Jorge,Jara; López,Marco A; San Martín,Álvaro; Salgado,Luis; Melo,Ovidio.
Approximately 85% of the water consumed in Chile is destined to agricultural irrigation and is managed by the users themselves. This study analyzed the price that irrigation water users pay to their Water User Associations (WUAs) to which they belong and the relationship of this price to the professional level and performance of the WUAs. The study included 24 WUAs: 10 River Administration Boards (JV) and 14 Irrigation Canal Associations (AC). The annual operational budget of each WUA, the price paid by users and the management capacities of the board of directors of each WUA were compared. The study also determined the relative value of user payments to WUAs as a proportion of total production costs of the main crops in each zone. The variability of user...
Tipo: Journal article
Palavras-chave: Water cost; Water users associations; WUAs; Water canal associations; River administration board.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000200012

Adoption of Bt Cotton: Threats and Challenges
Provedor de dados: 117
Autores: Faisal Bilal,Muhammad; Farrukh Saleem,Muhammad; Ashfaq Wahid,Muhammad; Shakeel,Amir; Maqbool,Mudassar.
Adopting new technology always involves advantages and risks; Bt cotton (Gossypium hirsutum L.) is a new technology well known in developed countries for its many advantages, such as reduced pesticide application, better insect pest control, and higher lint yield. However, its success in developing countries is still a question mark. Global adoption of Bt cotton has risen dramatically from 0.76 million ha when introduced in 1996 to 7.85 million ha in the 2005 cotton-growing season where 54% of the cotton crops in the USA, 76% in China, and 80% in Australia were grown with single or multiple Bt genes. Bollworms are serious cotton pests causing 30-40% yield reduction in Pakistan and 20-66% potential crop losses in India. The major advances shown in this...
Tipo: Journal article
Palavras-chave: Bt cotton; Management; Gossypium hirsutum.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300017

Adoption of cleaner production practices by dairy farmers in southern Chile
Provedor de dados: 118
Autores: Nahuelhual,Laura; Engler,María A; Carrillo,Bernardo; Moreira,Víctor; Castro,Ingrid.
Rising concerns about the environmental costs of dairy production have resulted in an increasing use of farm practices that diminish negative production externalities. Yet, little empirical evidence exists regarding the factors influencing the adoption of pollution-reducing strategies by dairy farmers. In this study, we estímate a logit probability model to explain first-stage adoption of capital-intensive cleaner production (CP) practices, using a sample of 100 médium and large-size dairy farms located in southern Chile. Voluntary approaches to pollution control in agriculture are relatively recent in Chile and diffusion has been slow and uneven among farmers. Only 43% of the farmers surveyed were using some CP practices at the time of the interview. The...
Tipo: Journal article
Palavras-chave: Chilean dairy sector; Dairy-derived pollution; Dairy farming; Environmental management; Technology innovation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000100009

Adult mesenchymal stem cell therapy for myelin repair in Multiple Sclerosis
Provedor de dados: 48
Autores: Rivera,Francisco J; Aigner,Ludwig.
Multiple sclerosis (MS) is a demyelinating immune-mediated disease of the central nervous system (CNS). It is the most frequent neurological disease in young adults and affects over 2 million people worldwide. Current treatments reduce the relapse rate and the formation of inflammatory lesions in the CNS, but with only temporary and limited success. Despite the presence of endogenous oligodendroglial progenitors (OPCs) and of spontaneous remyelination, at least in early MS its levels and its qualities are apparently insufficient for a sustained endogenous functional repair. Therefore, novel MS therapies should consider not only immunemodulatory but also myelin repair activities. Mesenchymal stem cells (MSCs) represent an attractive alternative to develop a...
Tipo: Journal article
Palavras-chave: Multiple sclerosis; Remyelination; Oligodendrocyte progenitor cells; Mesenchymal stem cell therapy and functional recovery.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000300007

Advances in Apple Transformation Technology to Confer Resistance to Fungal Diseases in Apple Crops: A Chilean Perspective
Provedor de dados: 117
Autores: Polanco,Víctor; Paredes,Mario; Becerra,Viviana; Pérez,Eduardo.
Apple (Malus domestica Borkh.) is one of the most consumed fruit in the world. Genetic transformation is a key process to sustain this demand by permitting the potential enhancement of existing cultivars as well as the development of new cultivars resistant to pests, diseases, and storage problems that occur in the major production areas. This review summarizes the advances of genetic engineering applied to the development of resistant apple cultivars to fungus disease, with particular attention in the generation of apples resistant to Venturia inaequalis (Cooke) G.Winter, the main phytosanitary problem that affects apple crops in Chile.
Tipo: Journal article
Palavras-chave: Apple; Fungal disease; Transgenic; Cisgenesis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200013

Advances in improving mammalian cells metabolism for recombinant protein production
Provedor de dados: 69
Autores: Altamirano,Claudia; Berrios,Julio; Vergara,Mauricio; Becerra,Silvana.
Background: The production of recombinant proteins for therapeutic use represents a great impact on the biotechnology industry. In this context, established mammalian cell lines, especially CHO cells, have become a standard system for the production of such proteins. Their ability to properly configure and excrete proteins in functional form is an enormous advantage which should be contrasted with their inherent technological limitations. These cell systems exhibit a metabolic behaviour associated with elevated cell proliferation which involves a high consumption of glucose and glutamine, resulting in the rapid depletion of these nutrients in the medium and the accumulation of ammonium and lactate. Both phenomena contribute to the limitation of cell...
Tipo: Journal article
Palavras-chave: Aerobic glycolysis; Cell engineering; CHO cells; Glutaminolysis; Metabolism.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300010

Advances in the development of a noninvasive embryo model for the evaluation of the quality of cloned embryos subjected to different treatments
Provedor de dados: 69
Autores: Felmer,Ricardo; Arias,María Elena.
Total number of cells in cloned embryos is generally lower than that of in vivo derived embryos and in bovines cell allocation at the blastocyst stage, has been observed to be affected in a large proportion of cloned embryos. The current embryo staining procedures are toxic for mammalian cells and thus can not be used to determine the developmental potential of a stained embryo. Therefore, in the present study we sought to assess the feasibility to develop a noninvasive embryo model that would be suitable for the evaluation of cloned embryos subjected to different nuclear transfer and embryo culture procedures. For doing this, we stably transfected a bovine embryonic fibroblast cell line and generated a number of clones that constitutively expressed a red...
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500002

Aerobic biodegradation of nonylphenol ethoxylates in shaking-flask test
Provedor de dados: 69
Autores: Wang,Ping; Nong,Xu-Hua; Ge,Jie-Hong.
Nonylphenol ethoxylates (NPEOs), which are widely used for industrial and domestic purposes, exert adverse effects on wildlife after being used and discharged into the environment. However, their ultimate biodegradability and biodegradation pathway remains unclear. In this study, the aerobic degradability of nonylphenol ethoxylates (NPEOs) by the acclimated microorganisms in active sludge was examined using shaking-flask tests. The degradation of benzene rings in NPEOs was determined using UV spectroscopy and high performance liquid chromatography (HPLC). Results showed that more than 80% of benzene rings were removed after 8-10 days of degradation, and the majority of NPEOs were also removed after 9 days of degradation, indicating NPEOs and the benzene...
Tipo: Journal article
Palavras-chave: Aerobic biodegradation; Degradation pathway; ESI-MS; HPLC; Nonylphenol ethoxylates.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400001

Aerobic removal of stigmasterol contained in kraft mill effluents
Provedor de dados: 69
Autores: Chamorro,Soledad; Xavier,Claudia Regina; Hernández,Victor; Becerra,José; Vidal,Gladys.
Kraft mill effluent, due to its organic matter content and acute toxicity, must be treated. A primary treatment followed by a secondary treatment is the most common system. Aerated lagoon is also considered an effective biological treatment, although this technology has some drawbacks related with operation parameters and land extension space. Moreover, the recovery efficiency for micropollutants contained in kraft mill effluent is questioned due to the anoxic zone in the system. The goal of this work is to evaluate the performance of the aerated lagoon to remove stigmasterol contained in kraft mill effluents. Kraft mill effluent was treated by an aerated lagoon (AL), which was operated with three different stigmasterol load rates (SLR = 0.2, 0.6 and 1.1...
Tipo: Journal article
Palavras-chave: Aerated lagoon; Kraft mill effluent; Stigmasterol.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200001

Age and Sex-Related Geometrical Variation of Ramus mandibulae of Sus scrofa's (Mammalia: Artiodactyla) Jaws
Provedor de dados: 77
Autores: Hohl,Leandro dos S. L; Sicuro,Fernando L; Azorit,Concepción; Carrasco,Rafael; Rocha-Barbosa,Oscar.
Morphological variation of the ramus mandibulae of wild Sus scrofa was described and correlated to sex and age differences. Young forms (n=27, 15 males, 12 females) and adults (n=23, 13 males, 10 females) were analyzed through Geometric Morphometrics (2-D) to assess differences between groups. We found significant differences between age- and sex-related shape variations at ramus mandibulae level. Young wild boars present bulky angular process with backward oriented coronoid process, while adults show slender jaw vertical ramus, and orthogonally oriented coronoid process. The ramus mandibulae in female wild boars is more robust and bulky than in males. The morphological changes between young and adult forms are related to alterations in the osteo-muscular...
Tipo: Journal article
Palavras-chave: Mandible; Ontogeny; Sexual Dimorphism; Wild boar.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400026

Age at Menarche and Related Factors in Girlsof Urban Areas of Markazi (Central) Province of Iran
Provedor de dados: 77
Autores: Bayat,ParvinDokht; Ghanbari,Ali; Khazaei,Mozafar; Ghorbani,Rostam; Amiri,Sara.
The age at menarche is an indicator of racial, geographical and nutritional patterns of different societies. This cross-sectional study conducted on 1223 girls aged 14-20 in the Markazi (Central) Province, Iran in 2010. In this research, the age at menarche, as the main variable, was determined for each city and compared between different cities. The statistical analyses included c2 test for determining statistically significant differences, variance analysis for determining the difference between groups, and Pearson correlation coefficient for determining the relationship between variables. The average age of first menstruation was 13.21±1.33 years in the Markazi Province, with no significant difference among the cities of the province. This age is...
Tipo: Journal article
Palavras-chave: Fertility; Growth; Iran; Menarche.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100002

Age Dependence of the Levels of Plasma Norepinephrine, Aldosterone, Renin Activity and Urinary Vanillylmandelic Acid in Normal and Essential Hypertensives
Provedor de dados: 48
Autores: ABD-ALLAH,NADIA M; HASSAN,FAYEZA H; ESMAT,AMR Y; HAMMAD,SOMAYA A.
In the present study the upper reference limits (URLs) for resting plasma norepinephrine, epinephrine, serum aldosterone, plasma renin activity, aldosterone/ renin activity ratio, as well as urinary vanillylmandelic acid in healthy Egyptian normotensive subjects over a range of ages (5-60 yr) were established. There was a significant age effect on plasma norepinephrine, UVMA, serum aldosterone and PRA, whereas a single URL for plasma epinephrine level is satisfactory. In uncomplicated untreated essential hypertensive subjects (5-60 yr), the average prevalence of elevation in the plasma norepinephrine, epinephrine and urinary vanillylmandelic acid above their corresponding URLs was 85.10,62.15 and 83.20 %, respectively. This suggests that elevation in...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000100010

Age Effect in the Morphological Traits Performance for Sex Determination in Human Skulls and Mandibles
Provedor de dados: 77
Autores: Suazo Galdames,Iván; Zavando,Daniela.
In this study we tested the hypothesis that diagnostic performance of the morphological indicators for sexual dimorphism are reduced as they are applied in skull and mandibles of older subjects. We used 275 adult human skulls, 250 of these with mandible, all subjects with sex and age registry. Sixteen classic morphological indicators of sexual dimorphism were evaluated, this information was compared with the registry and results noted in terms of precision. The best general performance of morphological indicators of sexual dimorphism were recorded in the 31 - 40 and 61 - 70 years, age range groups. Lowest precision ws recorded in the group corresponding to subjects between 21 ­ 30 years. Our results do not support the proposed hypothesis and suggest a...
Tipo: Journal article
Palavras-chave: Sexual dimorphism; Sex determination; Aging; Age; Skull.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100053

Age Estimation from Ossification of the Medial Clavicular Epiphysis by Computed Tomography
Provedor de dados: 77
Autores: El Morsi,Doaa A.; Abo El-Atta,Hend M; ElMaadawy,Merit; Tawfik,Ahmed M; Batouty,Nihal M.
The current study intended to evaluate the accuracy of age estimation from the development of the medial clavicular epiphysis (sternal end of the clavicle) in Egyptian population using computed tomography (CT) and to develop a discriminant formula that can be used in Egyptians. The study was conducted on 142 subjects (84 males and 58 females) after taken informed consent. They were subjected to multi-slice CT on the medial end of clavicles of both sides. The results revealed that the age of non - union was seen at 8­17 years; incomplete union at 15­20 years and complete union was seen at 20 years. It is concluded that the ossification of medial clavicular end could be used for age estimation. Also CT is a good visualization tool to be used. Regression...
Tipo: Journal article
Palavras-chave: Forensic science; Age estimation; Ossification status; Medial clavicular epiphysis; Sternal end of the clavicle; Identification; Computed tomography.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400038

Age of Jack mackerel Trachrus murphyi (Carangidae) using daily growth rings in sagittae otoliths
Provedor de dados: 72
Autores: Cisterna,Lilian; Arancibia,Hugo.
ABSTRACT Growth of Jack mackerel (Trachurus murphyi) was estimated using daily growth rings in fish collected in central-south Chile from 2004 to 2011. The von Bertalanffy growth curve at length for both sexes (n=210 individuals) is   FLt = 75*[1-e -0.16(  t +0.13)] where FLt is fork length (cm) at time t (years).
Tipo: Journal article
Palavras-chave: Age; Chile; Daily growth rings; Jack mackerel; Sagittae otoliths; Trachurus murphyi.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382017000100028

Age Prediction in the Adult Based on the Pulp-to-Tooth Ratio in Lower Third Molars: A Cone-beam CT Study
Provedor de dados: 77
Autores: Alsoleihat,Firas; Al-Shayyab,Mohammad H; Kalbouneh,Heba; Al-Zer,Heba; Ryalat,Soukaina; Alhadidi,Abeer; Saoud,Hamza; Shaweesh,Ashraf I; Al-Omoush,Salah A; Khraisat,Ameen.
Estimation of age-at-death is an integral part of the identification process of individuals in many forensic odontology cases where their identity cannot be determined by visualization or other ways. Dental age estimation in the adult is more challenging as most of the dentition is completely developed by 18 years of age. This study employs a mesio-distal (MD) pulp-to-tooth ratio taken at the neck of lower third molars (LM3) to provide an estimation of age at the time of radiographic imaging based on the well-known fact that pulp volume tends to decrease with advancing age due to continued apposition of secondary dentine throughout adulthood. A total of 155 Cone-beam computed tomography (CBCT) radiographs of LM3s for a random sample of 155 Jordanian Arabs...
Tipo: Journal article
Palavras-chave: Estimation of age-at-death; Forensic odontology; Archaeology; Paleontology; Dental age estimation; Third molars.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200017

Age Related Structural Changes in the Bulbourethral Gland of Gaddi Goat (Capra hircus)
Provedor de dados: 77
Autores: Archana,P; Katiyar,R. S; Sharma,D. N; Farooqui,M. M; Prakash,Ajay.
A study was conducted on the bulbourethral glands of 30 Gaddi goats, divided into three groups of 10 animals in each viz; Prepubertal (1 day old to &lt; 18 months of age), Pubertal (18 months to &lt; 5yrs of age) and Postpubertal (&gt;5yrs of age). The study revealed that the glands grew at a faster speed up-to 6 months of postnatal life after which the pace slowed down considerably. Almost 10 times increase in weight and more than three times increase in all the linear mensurations were observed in prepubertal group from the time of birth. The stroma vs parenchyma ratio which was 80:20 in one-day-old kids showed three times increase in parenchyma in prepubertal animals, and the ratio became 43:57. In one day old kids luminated and non-luminated secretory...
Tipo: Journal article
Palavras-chave: Bulbourethral gland; Gaddi goat; Histology; Histochemistry.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200049

Aged garlic extract and S-allylcysteine prevent apoptotic cell death in a chemical hypoxia model
Provedor de dados: 48
Autores: Orozco-Ibarra,Marisol; Muñoz-Sánchez,Jorge; Zavala-Medina,Martín E; Pineda,Benjamín; Magaña-Maldonado,Roxana; Vázquez-Contreras,Edgar; Maldonado,Perla D; Pedraza-Chaverri,José; Chánez-Cárdenas,María Elena.
BACKGROUND: Aged garlic extract (AGE) and its main constituent S-allylcysteine (SAC) are natural antioxidants with protective effects against cerebral ischemia or cancer, events that involve hypoxia stress. Cobalt chloride (CoCl2) has been used to mimic hypoxic conditions through the stabilization of the &amp;#945; subunit of hypoxia inducible factor (HIF-&amp;#921;&amp;#945;) and up-regulation of HIF-1a-dependent genes as well as activation of hypoxic conditions such as reactive oxygen species (ROS) generation, loss of mitochondrial membrane potential and apoptosis. The present study was designed to assess the effect of AGE and SAC on the CoCl2-chemical hypoxia model in PC12 cells RESULTS: We found that CoCl2 induced the stabilization of HIF-1a and its...
Tipo: Journal article
Palavras-chave: Aged garlic extract; Chemical hypoxia; Cobalt chloride; Hypoxia-inducible factor 1; PC12 cells; S-allylcysteine.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100007

AGEING INDUCES APOPTOSIS AND INCREASES HSP70 STRESS PROTEIN IN THE EPIDIDYMIS OF Octodon degus
Provedor de dados: 77
Autores: Bustos-Obregón,Eduardo; Esponda,Pedro.
Apoptosis has been largely analyzed in the testis. Nevertheless, the epididymis has been scarcely studied. We analyzed the number of apoptotic cells in the different regions (caput, corpus and cauda) of the epididymis of the South American rodent Octodon degus both young and senile. Apoptosis was identified using the TUNEL method which detects in situ DNA fragmentation. Apoptosis was detected in the principal cells of the epididymal epithelium. The caput epididymis was the region more affected. The caput of young animals showed that 0.32/1000 cells were apoptotic in contrast to 5.1/1000 of senile animals. Also in the cauda epididymis apoptosis is increased with age, appearing 0.14/1000 and 3.9/1000 in young and senile animals, respectively. On the other...
Tipo: Journal article
Palavras-chave: Androgens; Apoptosis; Epididymis; Ageing; Heat Shock Proteins.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000100005

AGELANIUS CHILOENSIS, ANEW SPECIES OF HORSE FLY FROM SOUTHERN CHILE (DIPTERA: TABANIDAE)
Provedor de dados: 72
Autores: González,Christian R.
The female oiAgelanius chiloensis, new species, from southern Chile is described and illustrated. Its relationships with other species oiAgelanius are discussed.
Tipo: Journal article
Palavras-chave: Agelanius chiloensis sp.n; Diachlorini; Neotropical Region; Tabanomorpha.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100002

Agenesia de Terceros Molares, Prevalencia, Distribución y Asociación con otras Anomalías Dentales
Provedor de dados: 77
Autores: Herrera-Atoche,José Rubén; Colomé-Ruiz,Gabriel Eduardo; Escoffié-Ramírez,Mauricio.
La agenesia de terceros molares se ha reportado en un 24,3% en México. La agenesia dental está asociada a otras anomalías dentales debido a su origen genético. El objetivo del presente estudio fue determinar la prevalencia y distribución de agenesia de terceros molares así como establecer su asociación con otras anomalías dentales en una población ortodóntica. La muestra incluyó 670 pacientes ortodónticos de 9 a 20 años de edad. Se excluyeron pacientes con tratamiento ortodóntico previo y condiciones sindrómicas. Se calculó la prevalencia de agenesia de terceros molares y se comparó por sexo. Posteriormente los pacientes fueron divididos en 2 grupos, con agenesia de al menos un tercer molar y un grupo control y en ambos se calculó la prevalencia de 10...
Tipo: Journal article
Palavras-chave: Agenesia; Anomalías dentales; Prevalencia; Tercer molar.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400035

Agenesia del Tercer Molar en Jóvenes entre 14 y 20 Años de Edad, Antofagasta, Chile
Provedor de dados: 77
Autores: García-Hernández,Fernando; Toro Yagui,Oscar; Vega Vidal,Manuel; Verdejo Meneses,Mauricio.
Se define agenesia como la ausencia de dientes por alteraciones genéticas aisladas o sindrómicas. La agenesia del tercer molar está asociada a malformaciones y considerada por diversos autores, consecuencia de la evolución humana. Son los dientes con mayor prevalencia de agenesia junto con segundos premolares e incisivos laterales. La prevalencia varía entre 9% y 37%, en tanto, Arboleda et al. (2006) señalan una prevalencia del 20%. La literatura señala variables estadísticas porcentuales, por género, por arcada dentaria, por lado y por diente, con escasos artículos sobre grupos originarios de Chile. La población en estudio consistió en 400 jóvenes (200 hombres y 200 mujeres) entre 14 y 20 años de edad pacientes de una clínica de ortodoncia de la ciudad de...
Tipo: Journal article
Palavras-chave: Antropología; Odontología; Agenesia; Tercer molar.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400008

Agenesia del Tercer Molar en Pacientes Atendidos en la Clínica Odontológica de la Universidad de Antofagasta, Chile
Provedor de dados: 77
Autores: García-Hernández,Fernando; Araneda Rodriguez,Claudia Patricia.
Se define agenesia como la ausencia de dientes por alteraciones genéticas aisladas o sindrómicas. La agenesia del tercer molar está asociada a malformaciones y es considerada por diversos autores, consecuencia de la evolución humana (Larmour et al., 2005). Son los dientes con mayor prevalencia de agenesia junto con segundos premolares e incisivos laterales (Fuller &amp;amp; Denehy, 1984). La prevalencia varía entre 9% y 37% (McNamara &amp;amp; Foley, 2006); Arboleda et al. (2006) señalan una prevalencia del 20%. La literatura indica variables estadísticas porcentuales, por género, por arcada dentaria, por lado y por diente, con escasos artículos sobre grupos originarios de Chile. La población en estudio consistió en 52 hombres y 48 mujeres, de 14 a 26 años...
Tipo: Journal article
Palavras-chave: Antropología; Odontología; Agenesia; Tercer molar.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200014

Agenesia del Tercer Molar en una Etnia Originaria del Norte de Chile: Atacameños o Lican Antai
Provedor de dados: 77
Autores: García-Hernández,Fernando; Beltrán Varas,Víctor Javier.
Agenesia es la ausencia de dientes por alteraciones genéticas aisladas o sindrómicas. La agenesia del tercer molar está asociada a malformaciones y considerada por diversos autores consecuencia de la evolución humana (Larmour et al., 2005). Son los dientes con mayor prevalencia de agenesia junto a los segundos premolares e incisivos laterales (Fuller &amp;amp; Denehy, 1984). La prevalencia varía entre 9 y 37% (McNamara &amp;amp; Foley, 2006), en tanto, Arboleda et al. (2006) señalan una prevalencia del 20%. La literatura señala variables estadísticas porcentuales, por género, por arcada dentaria, por lado y por diente, con escasos artículos sobre grupos originarios de Chile. La población en estudio consistió en 33 hombres y 57 mujeres de 16 a 55 años, de...
Tipo: Journal article
Palavras-chave: Antropología; Odontología; Agenesia; Tercer molar.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300013

Agenesia del Tercer Molar en una Etnia Originaria del Norte de Chile: Aymaras
Provedor de dados: 77
Autores: García-Hernández,Fernando; Beltrán Varas,Víctor Javier.
Agenesia es la ausencia de dientes por alteraciones genéticas aisladas o sindrómicas. La agenesia del tercer molar está asociada a malformaciones y es considerada por diversos autores consecuencia de la evolución humana (Larmour et al, 2005). Son los dientes con mayor prevalencia de agenesia junto con segundos premolares e incisivos laterales (Fuller &amp;amp; Denehy, 1984). La prevalen-cia varía entre 9% y 37% (McNamara &amp;amp; Foley, 2006), en tanto Arboleda et al. (2006) señalan una prevalencia del 20%. La literatura señala variables estadísticas porcentuales, por género, por arcada dentaria, por lado y por diente, con escasos artículos sobre grupos originarios de Chile. La población en estudio consistió en 78 individuos, 42 hombres y 36 mujeres,...
Tipo: Journal article
Palavras-chave: Antropología; Odontología; Agenesia; Tercer molar.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100027

Agenesis of Palmaris Longus Muscle in Selected Population of School Children in Nigeria
Provedor de dados: 77
Autores: Adejuwon,Sunday Adeyemi; Salawu,Oyetunde Timothy; Ajibola,Bosede.
The aim of this study is to evaluate the prevalence of agenesis of palmaris longus muscle tendon among school children in Ogun state, Southwestern Nigeria and also, to verify the symmetry of the agenesis of the muscle in relation to sex. The presence of the palmaris longus muscle tendon was determined in 564 individuals, 285 male and 279 female, with age varying from 2 to 20 years old. Four different tests were used; Schaeffer's test, Thompson's test, Mishra's test 1 and Pushpakumar's "two-finger sign" method. The data obtained were further analyzed statistically and the agenesis of palmaris muscle was found to be 26.7% (unilateral 13.0%; bilateral 13.7%). Prevalence was higher in female (32.3%) than male (21.4%) (P&gt;0.05). Besides, we observed higher...
Tipo: Journal article
Palavras-chave: Agenesis; Children; Palmaris longus muscle; Prevalence.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400052

Agenesis of the Medial Gastrocnemius and Plantar Muscle: Case Presentation
Provedor de dados: 77
Autores: Álvarez,María Fernanda; Bueno,Camilo Alfonso; Ballesteros,Luis Ernesto.
We present the case of a left medial gastrocnemius and plantar muscle agenesis in a 58-years old male cadaveric specimen from the Anatomy Laboratory at the Universidad Industrial de Santander (Bucaramanga-Colombia). These unusual muscle absences and associated functional alterations, enrich anatomical knowledge and become important by the time the affected individual may need a reconstructive procedure.
Tipo: Journal article
Palavras-chave: Agenesis; Medial gastrocnemius; Plantar muscle.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100006

Age-related changes in quality and fertility of porcine semen
Provedor de dados: 48
Autores: Tsakmakidis,Ioannis A; Khalifa,Tarek AA; Boscos,Costas M.
The aim of this study was to investigate the effect of boar age on quality traits and fertility of liquid-stored semen. Boars were allocated into 3 age groups: 7-10 months (young), 18-33 months (mature), 51-61 months (old). Ejaculates of &amp;gt; 200x10(6) sperm/ml and 85% total motile sperm were extended to 30x10(6) sperm/ml, stored at 17-18 °C and used within 12-24 h for artificial insemination (AI) of 2062 multiparous sows. After 24 h of storage, aliquots of diluted semen were assessed for sperm progressive motility (SPM), incidence of sperm chromatin instability (SCI), proportion of live morphologically normal sperm (LMNS) and head morphometry of LMNS. The results showed that young boars had higher percentages of SCI and lower proportions of LMNS than...
Tipo: Journal article
Palavras-chave: Boar age; Boar semen; Morphology; Morphometry; Sperm chromatin.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000400009

Age-Related Changes in the Expression of ICAM-1 in the Aorta of Wistar Albino Rats
Provedor de dados: 77
Autores: Ketani,Sennur; Karakoç,Zelal; Ketani,M. Aydin; Kilinç,Mehmet.
ICAM-1 which is expressed by endothelial cells and leukocytes are observed as first markers in diseases such as transplant rejection, diabetes and atherosclerosis and in infections caused by various pathogens. In the present study, it is aimed to reveal the age-related changes in the expression of ICAM-1 on rats. Therefore, a total of 30 albino rats were taken at the age of 6, 18 and 24 months without gender discrimination. Rats were fed with standard pellet feed during the study. Afterwards, rats were sacrificed and tissue samples were collected from their rats, and the samples were evaluated under the light microscope by staining with immnunohistochemical method. It was determined that the expression of both aortic endothelial cells and endothelial cells...
Tipo: Journal article
Palavras-chave: ICAM-1; Rat; Aortic endothelium; Age.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400049

Age-Related Changes in the Urinary Bladder of the Female Albino Rats
Provedor de dados: 77
Autores: Akram Al-Motabagani,Mohamed.
Disturbances of the urinary bladder functions are common in the elderly people particularly women. So, it was the aim of the present work to detect the age-associated changes in the urinary bladder that might play a role in the bladder dysfunctions. Twenty albino rats were used in the present work. They were divided into two equal groups, each consisted of ten rats. The first group included the adult rats (aged 3 months) and served as control group, while the second group was the senile rats (aged 24 months). Specimens of the urinary bladder were taken, processed and examined using the light microscope (LM) and the scanning electron microscope (SEM). Light microscopic examination of the urinary bladder of the aged rats showed marked mucosal damage, ranging...
Tipo: Journal article
Palavras-chave: Urothelium; Urinary mucosa; Urinary muscularis; Bladder dysfunction.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000400005

Aggressive Citrus tristeza virus isolates in Chile are MCA13-positive and VT type, while mild isolates are MCA13-negative and T30 type
Provedor de dados: 118
Autores: Besoain,Ximena; Bertolini,Edson; Camps,Rocío; Ramella,Fiona; Gorris,María Teresa; Torres,Margarita; Cambra,Mariano.
Citrus tristeza virus (CTV) was reported in the 1960's to affect Meyer lemon trees in Chile, but no field symptoms were observed. This study performed a complete biological, serological and molecular characterization of one hundred CTV isolates obtained from different hosts and geographical origins. Decline symptoms (DI) were not found on trees grafted onto sour orange. In Pica Oasis in northern Chile, stem pitting (SP) was found to affect grapefruit and Mexican lime trees. Most isolates present in the central area were considered mild (MCA-13-negative), while in the northern area aggressive isolates were observed and detected. Some of these isolates were capable of causing SP on grapefruit under field and greenhouse conditions and on sweet orange under...
Tipo: Journal article
Palavras-chave: Biological indexing; CTV; Molecular characterization; Stem pitting; Seedling yellows.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000200011

Aggressive Pregnancy Tumor (Pyogenic Granuloma) with Extensive Alveolar Bone Loss Mimicking a Malignant Tumor: Case Report and Review of Literature
Provedor de dados: 77
Autores: Martins-Filho,Paulo Ricardo Saquete; Piva,Marta Rabello; da Silva,Luiz Carlos Ferreira; Reinheimer,Daniele Machado; Santos,Thiago de Santana.
Oral pyogenic granuloma is a hyperplastic inflammatory lesion commonly associated to local irritation or trauma. Females are more affected than men probably due to the vascular effects of hormones that occur during puberty, pregnancy and menopause. In the pregnancy, the lesions are known as "pregnancy tumor" and tend to occur more frequently during the second and third trimester. In the oral cavity, histopathological examination is required for diagnosis, since the lesion is clinically indistinguishable from other reactive lesions and, usually, there is no evidence of bone involvement. The authors report a rare case of pyogenic granuloma with destruction of alveolar bone mimicking a malignant tumor in a 20-year-old woman in the 19th week of pregnancy.
Tipo: Journal article
Palavras-chave: Pyogenic granuloma; Pregnancy tumor; Granuloma gravidarum.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100028

Aging gene pathway of microRNAs 156/157 and 172 is altered in juvenile and adult plants from in vitro propagated Prunus sp.
Provedor de dados: 118
Autores: Bastías,Adriana; Almada,Rubén; Rojas,Pamela; Donoso,José Manuel; Hinrichsen,Patricio; Sagredo,Boris.
A. Bastías, R. Almada, P. Rojas, J.M. Donoso, P. Hinrichsen, and B. Sagredo. 2016. Aging gene pathway of microRNAs 156/157 and 172 is altered in juvenile and adult plants from in vitro propagated Prunus sp. Cien. Inv. Agr. 43(3):429-441. In vitro culture is a very popular technique to mass propagate valuable plant genotypes, including Prunus sp. cultivars. Plants that undergo tissue culture processes often change their morphology and behavior due to the "rejuvenation" caused by the plant growth regulators included in the medium. To evaluate the effects of rejuvenation by tissue culture in Prunus sp., the expression patterns of the aging gene pathway described in plant models, which include the highly conserved microRNA (miRNA or miR) 156/157 and 172...
Tipo: Journal article
Palavras-chave: Development; In vitro culture; Hase change; Rejuvenation.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300009

AgNO3: a potential regulator of ethylene activity and plant growth modulator
Provedor de dados: 69
Autores: Kumar,Vinod; Parvatam,Giridhar; Ravishankar,Gokare Aswathanarayana.
The aim of this review is to critically analyze the role of silver nitrate (AgNO3) in modulating plant growth and development. In recent years, basic studies on ethylene regulation opened new vistas for applied research in the area of micro-propagation, somatic embryogenesis, in vitro flowering, growth promotion, fruit ripening, and sex expression. Silver nitrate has proved to be a very potent inhibitor of ethylene action and is widely used in plant tissue culture. Few properties of silver nitrate such as easy availability, solubility in water, specificity and stability make it very useful for various applications in exploiting plant growth regulation and morphogenesis in vivo and in vitro. Silver ion mediated responses seem to be involved in polyamines,...
Tipo: Journal article
Palavras-chave: Calcium; Ethylene; Morphogenesis; Polyamines; Silver nitrate; Somatic embryogenesis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200008

Agricultural employment in Spain and new Keynesian economics
Provedor de dados: 118
Autores: Andrés González-Moralejo,Silvia; García Cortés,Mildrey.
Our research examines the agricultural labor market from the perspective of new Keynesian economics. Our aim is to verify that total gross output, total factor productivity, and real wages act as determinants of employment levels in Spanish agriculture. Three structural econometric models were estimated using census data for the period 1998-2013. This was a period of profound economic and social change, and the following two distinct sub-periods were compared: 1998-2007 (a period of economic boom) and 2008-2013 (a period of recession). The empirical evidence is consistent with neo-Keynesian theoretical posits, albeit with certain qualifiers derived from the specifically rural nature of the evidence. The results show a negative relationship between...
Tipo: Journal article
Palavras-chave: Agrarian labor market; Neo-Keynesian model; Wages.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200002

Agricultural Labor Demand in Chile: A Cointegration Approach
Provedor de dados: 117
Autores: Saens N,Rodrigo; Lobos A,Germán; Rivera A,Edinson.
International evidence shows that the positive relationship between product and agricultural labor has weakened during the last 30 years, especially in emergent economies. Chilean agriculture has not been left out of this phenomenon The main purpose of this reseach was to estimate the causality relationships that govern the product, employment and salaries in the Chilean silviculture-agricultural-livestock sector, using a cointegration approach. Quarterly data from the 1996-2005 period were employed to estimate agricultural labor demand. A Cobb-Douglas agricultural production function was employed and from it were derived the minimum cost function and the labor demand as bases of this study; the latter was approximated log-linearly to find different...
Tipo: Journal article
Palavras-chave: Agricultural labor; Cobb-Douglas; Employment-product elasticity; Employment-salary elasticity.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400009

Agricultural landscapes as habitat for birds in central Chile
Provedor de dados: 97
Autores: Muñoz-Sáez,Andrés; Perez-Quezada,Jorge F.; Estades,Cristián F.
Abstract  Background: Understanding the role of agroecosystems as habitat for wildlife is crucial for long-term conservation planning, as different crop stratification and landscape elements can influence bird communities, which are also affected by seasonality. The goal of our study was to determine how agricultural landscapes varying in land cover characteristics affect bird richness and abundance. Bird surveys were conducted at 110 locations within agricultural landscapes in central Chile. The surveyed areas were characterized by land cover at two scales (50 and 500 m radii) through direct observation and photo-interpretation, during winter and spring seasons. Generalized Linear Mixed Models were used to evaluate the effects of different agricultural...
Tipo: Journal article
Palavras-chave: Hedgerows; Season; Orchards; Low crops; Avian communities.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2017000100202

Agrobacterium rhizogenes mediated genetic transformation resulting in hairy root formation is enhanced by ultrasonication and acetosyringone treatment
Provedor de dados: 69
Autores: Kumar,Vinod; Sharma,Ashwani; Narasimha Prasad,Bellur Chayapathy; Bhaskar Gururaj,Harishchandra; Aswathanarayana Ravishankar,Gokare.
The phytopathogenic bacteria Agrobacterium rhizogenes genetically transforms plants by transferring a portion of the resident Ri plasmid, the T-DNA to the plant. Plant species differ in their temporal competence for transformation. But various physical and chemical methods are found to enhance transformation frequency. Agrobacterium rhizogenes mediated transformation efficiency was assessed under the influence of sonication, calcium treatment, acetosyringone and macerating enzymes in suitable combinations in Nicotiana tabacum as a model system. Manual wounding resulted in 21% transformation frequency. Where as sonication resulted in 2.2 fold increase, followed by sonication with CaCl2 treatment resulted in 2.5 fold increase and sonication with...
Tipo: Journal article
Palavras-chave: Agrobacterium rhizogenes; Hairy roots; Nicotiana tabacum; Transformation frequency; Ultra-sonication.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400002

Agrobacterium tumefaciens: a natural tool for plant transformation
Provedor de dados: 69
Autores: de la Riva,Gustavo A; González-Cabrera,Joel; Vázquez-Padrón,Roberto; Ayra-Pardo,Camilo.
Updated information of mechanisms for T-DNA transfer to plant cells by Agrobacterium tumefaciens is provided, focused on the role played by the different components of the virulence system. The general assessments for the establishment of efficient transformation protocols are discussed with an emphasis in the application of this methodology to monocotyledonous plants. Based on our own experience, we present the establishment of sugarcane transformation by A. tumefaciens as a model of application of this methodology to an important culture plant species, previously considered recalcitrant and inaccessible for this type of genetic manipulation.
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000300002

Agrobacterium tumefaciens-transient genetic transformation of Habanero pepper (Capsicum chinense Jacq.) leaf explants
Provedor de dados: 69
Autores: Arcos-Ortega,Guadalupe Fabiola; Chan-Kuuk,Rafael Antonio; González-Kantún,Wilma Aracely; Souza-Perera,Ramón; Nakazawa-Ueji,Yumi Elena; Avilés-Berzunza,Elidé; Godoy-Hernández,Gregorio; Lawton,Michael A; Zúñiga Aguilar,José Juan.
Most of the pepper species of the genus Capsicum have been recalcitrant to efficient Agrobacterium tumefaciens-mediated stable or transient, genetic transformation. In the present work, we optimized a protocol for transient transformation of the Habanero pepper (Capsicum chinense Jacq.) through the standardization of several experimental factors. These included the age of the plants, the temperature, the length of co-cultivation, the application of a negative (vacuum) and/or a positive (infiltration) pressure, along with micro injection, the use of acetosyringone during the bacterial culturing, and modification of the pH during the GUS assay to eliminate the endogenous &amp;#946;-glucuronidase activity. The standardized protocol, which yielded nearly 55%...
Tipo: Journal article
Palavras-chave: Cocultivation; GUS assay.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400007

Agrobacterium-mediated transient transformation of Mexican prickly poppy (Argemone mexicana L.)
Provedor de dados: 69
Autores: Godoy-Hernández,Gregorio; Avilés-Berzunza,Elidé; Carrillo-Pech,Mildred; Vázquez-Flota,Felipe.
Shoot apex, leaf primordia, leaf sections and roots from Mexican prickly poppy seedlings, were inoculated with Agrobacterium tumefaciens harboring the binary vector pCAMBIA2301, which contained the &amp;beta;-glucuronidase (uid A) gene. Histochemical &amp;beta;-glucuronidase (GUS) assay in infected explants showed transient gus gene expression between 3 and 12 days after inoculation. To our knowledge, this is the first report of A. mexicana susceptibility to A. tumefaciens-mediated genetic transformation
Tipo: Journal article
Palavras-chave: Argemone mexicana &amp;beta; -glucuronidase benzylisoquinoline alkaloids genetic transformation neomycin phosphotransferase II.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100013

Agronomic and molecular analyses for the characterisation of accessions in Tunisian olive germplasm collections
Provedor de dados: 69
Autores: Taamalli,Wael; Geuna,Filippo; Banfi,Riccardo; Bassi,Daniele; Daoud,Douja; Zarrouk,Mokhtar.
In this study, a total of 14 agronomic traits, five AFLP primer combinations and ten SSR loci were used to describe and to classify a group of Tunisian olive genotypes into groups based on molecular profiles and agronomic traits. The analysis of variance of the agronomical data revealed significant differences among accessions for all measured traits. The mean phenotypic dissimilarity (0.34 with a range of 0.08-0.6) was low in comparison to dissimilarity calculated using AFLP (0.50 with a range of 0.16-0.70) and SSR markers (0.76 with a range 0.35-0.94). The correlation between the agronomical dissimilarity matrix and the matrices of genetic dissimilarity based on SSR and AFLP markers was very weak: 0.156 (p = 0.05) and 0.185 (p = 0.05), respectively. The...
Tipo: Journal article
Palavras-chave: Agronomic traits; AFLP; Olea europaea; SSR.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500002

Agronomic characteristics and chemical composition of Gliricidia sepium grown under different residual heights in different seasons
Provedor de dados: 118
Autores: Silva,Shirlenne F; Carneiro,Maria S. de S.; Edvan,Ricardo L; Pereira,Elzânia S; Neto,Luiz B. de Morais; Pinto,Andréa P; Camilo,Danilo de A.
This research was conducted to evaluate the agronomic characteristics and chemical composition of Gliricidia sepium (Jacq.) Steud grown under different residual heights in different seasons. The experimental design used was a complete randomized block in a split-plot. The plots consisted of three residual heights (70, 90 and 110 cm), and the subplots were four seasons (fall, winter, spring and summer) with four replicates. There was no (P&amp;gt;0.05) interaction between season and residual heights for agronomic characteristics. However, these features were influenced by the cutting season, with no significant effect (P&amp;gt;0.05) on residual height. Significant effects (P&lt;0.05) were observed for dry matter, mineral matter, acid detergent fiber and...
Tipo: Journal article
Palavras-chave: Cutting management; Harvest time; Legumes; Nutritional value; Semiarid.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100004

Aguacero-INIA, nuevo cultivar de triticale de primavera para Chile
Provedor de dados: 113
Autores: Mellado Z.,Mario; Madariaga B.,Ricardo; Matus T.,Ivan.
Aguacero-INIA es un cultivar de triticale (X Triticosecale Wittmack) de primavera creado por el Proyecto Trigo del Instituto de Investigaciones Agropecuarias, en el Centro Regional de Investigación Quilamapu, Chillán, a partir de un cruzamiento efectuado en 1992. El grano es de color rojo y de forma elíptica. La altura de la planta varía entre 105 y 120 cm, y la espiga es blanca y barbada. Su rendimiento en ensayos ha variado entre 7,0 y 12,0 t ha-1. La dureza del grano, el valor de sedimentación y el glúten húmedo varían entre 30-40%, 15-20 cm³ y 15-20%, respectivamente. Estas características corresponden a un grano suave, en la escala usada para el trigo. La proteína y niveles de energía del grano indican que es apropiado para alimentación animal.
Tipo: Journal article
Palavras-chave: Triticale de primavera; Aguacero-INIA.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100010

Aislación y Caracterización de Células Madre Mesenquimales Provenientes de Pulpa y Folículo Dentario Humano
Provedor de dados: 77
Autores: Brizuela C,Claudia; Galleguillos G,Sussy; Carrión A,Flavio; Cabrera P,Carolina; Luz C,Patricia; Inostroza S,Carolina.
Recientemente se ha descubierto que diversos tejidos dentales son fuente importante de Células Madre Mesenquimales (CMM). En la cavidad oral podemos encontrar CMM en la pulpa, en el folículo dental, papila y en la encía entre otros lugares. Varios estudios avalan el extenso potencial terapéutico de las CMM en terapias de regeneración. El objetivo de este estudio es aislar, cultivar células madres mesenquimales de pulpa y folículo dental humano, caracterizar su inmunofenotipo y su potencial de diferenciación a linaje osteogénico, condrogénico y osteogénico. Se cultivaron células de pulpa y folículo dental de terceros molares de dientes permanentes jóvenes humanos. Los cultivos de CMM fueron monitoreados por microscopia óptica, las células se...
Tipo: Journal article
Palavras-chave: Células madre mesenquimales; Pulpa y folículo dental; Diferenciación multilinaje; Potencial de proliferación.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200063

AISLAMIENTO DE BACTERIAS RESISTENTES A ARSENICO DESDE MUESTRAS DE ROCAS VOLCANICAS DE LA QUEBRADA CAMARONES, REGION PARINACOTA: CHILE
Provedor de dados: 72
Autores: Campos,Víctor; Valenzuela,Cristian; Alcorta,Marcela; Escalante,Guisella; Mondaca,María A.
El arsénico se encuentra en estado natural en rocas, suelo, agua, aire y es liberado al ambiente mediante fenómenos naturales tales como erupciones volcánicas, erosión de las rocas e incendios forestales, donde los microorganismos son esenciales para el ecosistema por su participación en diferentes procesos naturales. El objetivo del trabajo fue aislar bacterias resistentes a arsénico, desde muestras de rocas provenientes de la Quebrada Camarones, región Parinacota, Chile. Las rocas fueron cultivadas en un medio mineral adicionado con arsenito (500 ug/ml) durante 7 días a temperatura ambiente y con agitación. Las cepas fueron aisladas en diferentes medios e identificadas mediante el sistema Rapid™NF plus. La capacidad de oxidar arsénico fue realizada...
Tipo: Journal article
Palavras-chave: Arsenito; Arseniato; Wautersia solanacearum; Pseudomonas alcaligenes.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200003

Aislamiento de consorcios de hongos micorrícicos arbusculares de plantas medicinales y su efecto en el crecimiento de vinca (Catharanthus roseus)
Provedor de dados: 97
Autores: DE LA ROSA-MERA,CLAUDIA; FERRERA-CERRATO,RONALD; ALARCÓN,ALEJANDRO; SÁNCHEZ-COLÍN,MARÍA DE JESÚS; FRANCO-RAMÍREZ,ALICIA.
Este trabajo consistió en propagar e identificar hongos micorrícicos arbusculares (HMA) recolectados de plantas medicinales (PM) de áreas naturales de bosques mixtos, y seleccionar consorcios micorrícicos con base en la promoción del crecimiento de vinca Catharanthus roseus (L) G. Don, planta medicinal cuyos alcaloides tienen propiedades antineoplásicas. En la primera fase experimental se recolectaron raíces y suelo rizosférico de 13 PM establecidas en campo para evaluar el porcentaje de colonización total (PCT) y cuantificar el número de esporas; además, se tomó una parte del suelo para establecer plantas trampa en invernadero durante 10 meses, y posteriormente evaluar el PCT e identificar los principales géneros de HMA. Todas las PM en su condición...
Tipo: Journal article
Palavras-chave: Colonización micorrícica; Cultivos trampa; Planta medicinal; Selección de hongos micorrícicos; Simbiosis micorrícica.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000200005

‘Akukeli’ una Nueva Variedad de Ajo Rosado
Provedor de dados: 113
Autores: González A,María Inés.
El clon de ajo (Allium sativum L.) Akukeli, seleccionado como variedad sobresaliente para la VIII Región, Chile, corresponde a un tipo semitardío (198 días desde emergencia a cosecha, sembrado en mayo) y no emite tallo floral. El bulbo tiene las catáfilas externas de color blanco y presenta, en promedio, 15 dientes de color rosado pálido. Sus hojas son erectas y de color verde oscuro. Este clon fue seleccionado principalmente por su alto rendimiento y calidad. La calidad está dada por la ausencia total de ramaleo, su forma regular y buena capacidad de guarda. La temperatura óptima para su brotación se encuentra entre los 20 y 25°C y la temperatura base de brotación es de 0°C. En tanto que la temperatura óptima de emergencia es de 20°C y la base para este...
Tipo: Journal article
Palavras-chave: Clon; Capacidad de guarda; Rendimiento.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000200011

Al 3+ - Ca2+ INTERACTION IN PLANTS GROWING IN ACID SOILS: AL-PHYTOTOXICITY RESPONSE TO CALCAREOUS AMENDMENTS
Provedor de dados: 126
Autores: Meriño-Gergichevich,C; Alberdi,M; Ivanov,A.G; Reyes-Diaz,M.
High aluminum (Al) concentrations as Al3+ represent an important growth and yield limiting factor for crops in acid soils (pH &amp;#8804;5.5). The most recognized effect of Al-toxicity in plants is observed in roots. However, damages in the upper parts (including stem, leaves and fruits) may also be present. In addition, Al-toxicity triggers an increase in reactive oxygen species (ROS), causing oxidative stress that can damage the roots and chloroplasts, decreasing normal functioning of photo synthetic parameters. Al-toxicity may also increase or inhibit antioxidant activities, which are responsible to scavenge ROS. As result of the negative effects of toxic Al, root metabolic processes, such as water and nutrient absorption, are disturbed with a...
Tipo: Journal article
Palavras-chave: Acid soils; Aluminum; Amendments; Calcium; Gypsum.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100003

Albendazole Sulphoxide Administered Prior to Mating andits Relation with Fertilization and Mouse Embryo Development
Provedor de dados: 77
Autores: Teruel,M; Catalano,R; Salomón,L.
The aim of this work was to evaluate the effect of albendazole sulphoxide (ABZSO) administered to Balb C mice prior to mating on fertilization rate and preimplantational embryo development. Twenty four female mice 5-8 weeks of age were superovulated by intraperitoneal injection of 7.5 UI of equine chorionic gonadotropin (eCG, Novormon®, Laboratorios Syntex S.A., Argentina); 48 h later they received 10 IU of human chorionic gonadotropin (hCG, Profasi®, Laboratorios Serono, Méjico) and were paired with males of proven fertility. Females received 100 mg/kg or 200 mg/kg of ABZSO orally at the time of hCG administration, prior to mating. The control group received carboxymethylcellulose, vehicle used to prepare the drug suspension. Pregnant females were killed...
Tipo: Journal article
Palavras-chave: Albendazole Sulphoxide; Reproductive toxicity; Embryo development; Mouse.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300024

Alcohol and Mortality from All Causes
Provedor de dados: 48
Autores: RENAUD,SERGE; LANZMANN-PETITHORY,DOMINIQUE; GUEGUEN,RENÉ; CONARD,PASCALE.
A large number of prospective studies have observed an inverse relationship between a moderate intake of alcohol and coronary heart disease morbidity and mortality. Concerning death from all-causes, results are not unanimous. Alcohol intake was associated with a protection of all-cause mortality in England and USA physicians and the large study of the American Cancer Society. None of these studies separated the effects of different alcoholic beverages. In our prospective studies in France on 35 000 middle-aged men, we observed that only wine at moderate intake, was associated with a protective effect on all-cause mortality. The reason was that in addition to the known effect on cardiovascular diseases, a very moderate intake of wine, protected also from...
Tipo: Journal article
Palavras-chave: Alcohol; Mortality; Wine.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200002

Alcohol, Wine and Platelet Function
Provedor de dados: 48
Autores: RUF,JEAN-CLAUDE.
Epidemiological studies have demonstrated an inverse correlation between moderate wine and alcohol consumption and morbidity and mortality from coronary heart disease. The protective effect has been associated with an increase in the plasma level of HDL cholesterol, as it is well recognized that plasma HDL is inversely correlated with CHD. In addition, it has become evident that blood platelets contribute to the rate of development of atherosclerosis and CHD through several mechanisms. In recent studies it has been shown that the level of HDL cholesterol can explain only 50 % of the protective effect of alcoholic beverages; the other 50 % may be partly related to a decrease in platelet activity. This anti-platelet activity of wine is explained by ethanol...
Tipo: Journal article
Palavras-chave: Alcohol; Cardiovascular disease; Platelet function; Wine.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200006

Alfonso Roque Albanese: Pionero de la Cirugía Cardíaca Latinoamericana. Homenaje de la Asociación Panamericana de Anatomía
Provedor de dados: 77
Autores: Losardo,Ricardo J; Cruz Gutiérrez,Rolando; Prates,José C; Rodríguez Torres,Alberto; Prates,Nadir E. Valverde Barbato de; Arteaga Martínez,Manuel; Cabral,Richard Halti.
Alfonso Roque Albanese (1906-2005) es considerado un pionero de la cirugía cardíaca Latinoamericana por sus importantes aportes. Fue miembro fundador de la Asociación Panamericana de Anatomía. Investigador y docente tanto de la anatomía como de la cirugía, uniendo ambas disciplinas.
Tipo: Journal article
Palavras-chave: Alfonso Roque Albanese; Asociación Panamericana de Anatomía; Anatomía; Cardiocirugía; Cirugía cardíaca; Latinoamérica.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300033

Alfred Russel Wallace (1823-1913): Obra y figura
Provedor de dados: 97
Autores: GALLARDO,MILTON H.
Este año se conmemoran 100 años del fallecimiento de Alfred Russel Wallace, codescubridor de la teoría de la evolución por selección natural. Nació en Gales, y a los 13 años dejó la escuela por los escasos recursos de su familia. Era un libre pensador, de mente abierta e inquisitiva. Su interés y conocimiento por la evolución se desarrolló en sus viajes al Amazonas y al archipiélago Malayo, donde recolectaba especies que vendía a los museos de Inglaterra para subsistir. Su trabajo en mariposas es un ejemplo paradigmático de darwinismo que incluye el rol del aislamiento reproductivo. Sus estudios en el suroeste de Asia lo llevaron a descubrir la Línea de Wallace. Otro gran éxito fue su trabajo de 1855, "On the law which regulated the introduction of new...
Tipo: Journal article
Palavras-chave: Darwinismo; Evolución; Selección natural; Wallace.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300002

Alfred Russel Wallace and the Darwinian Species Concept: His Paper on the Swallowtail Butterflies (Papilionidae) of 1865
Provedor de dados: 72
Autores: Mallet,James.
Soon after his return from the Malay Archipelago, Alfred Russel Wallace published one of his most signifcant papers. The paper used butterfies of the family Papilionidae as a model system for testing evolutionary hypotheses, and included a revision of the Papilionidae of the region, as well as the description of some 20 new species. Wallace argued that the Papilionidae were the most advanced butterfies, against some of his colleagues such as Bates and Trimen who had claimed that the Nymphalidae were more advanced because of their possession of vestigial forelegs. In a very important section, Wallace laid out what is perhaps the clearest Darwinist defnition of the differences between species, geographic subspecies, and local ‘varieties.’ He also discussed...
Tipo: Journal article
Palavras-chave: History of evolution; Mimicry; Species concepts; Geographic variation; Taxonomic infation; Island biology; Lepidoptera.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000300005

ALGAL STUDIES IN BOLIVIA: A COMPILATION AND PRELIMINARY ANALYSIS OF EXISTING PHYCOLOGICAL LITERATURE
Provedor de dados: 73
Autores: Morales,Eduardo A; Fernández,Erika; Fernandez,Carla E; Lizarro,Dennis; Alcoreza,Pamela.
A compilation of phycological literature published on Bolivian algae is presented together with an analysis of strengths, weaknesses, and needs in this field of investigation. An analysis of the nationality of authors, type, content, and geographic focus of the references shows that literature is largely produced by foreign scientist, concentrated on just a few areas of the country, or are biased toward particular algal groups, leaving ample room for more exploration. The Altiplano (high mountain plateau) and Amazon concentrate most of the publications, the phytoplankton and algae found in sediment cores, being the communities that have received more attention from scientists. Taxonomic references focus more on phytoplankton and tychoplankton communities...
Tipo: Journal article
Palavras-chave: Bolivia; Phycology; Algae; Freshwater.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100009

Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast
Provedor de dados: 97
Autores: JARAMILLO,EDUARDO; HUZ,ROSARIO DE LA; DUARTE,CRISTIAN; CONTRERAS,HERALDO.
Four Chilean sandy beaches were sampled during the summer of 2000, to study the role of stranded algal wrack deposits on the population abundances of three detritus feeder species of the macroinfauna that inhabit the upper shore levels of that beaches: the talitrid amphipod Orchestoidea tuberculata Nicolet, the tylid isopod Tylos spinulosus Dana and the tenebrionid insect Phalerisida maculata Kulzer. The beaches were Apolillado (ca. 29° S), Quidico (ca. 38° S), Guabún and Mar Brava (ca. 42° S). Replicated samples were collected with a plastic cylinder (25 cm in diameter) from algal wrack deposits including the sediments beneath the wrack and nearby bare sand areas. Samples were collected at two beach levels, one closer to the sea with fresh deposits and...
Tipo: Journal article
Palavras-chave: Algal wrack deposits; Sandy beach arthropods; Chilean coast.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300006

ALGODOEIRO CULTIVADO EM SOLO TRATADO COM CALCÁRIO, LODO DE ESGOTO E CÁDMIO
Provedor de dados: 127
Autores: Assis Rodrigues Nogueira,Thiago; Omir Marques,Marcos; Almeida Muçouçah,Fernando; Machado Fonseca,Ivana.
O objetivo do trabalho foi avaliar o acúmulo de nutrientes e metáis pesados em diferentes partes das plantas de algodoeiro (Gossypium hirsutum cv. IAC 22) cultivadas em solo que recebeu calcário e lodo de esgoto contaminado com cádmio. O experimento foi conduzido em casa de vegetacáo na FCAV/Unesp, em Jaboticabal-SP, em Latossolo Vermelho argiloso. Utilizou-se o delineamento experimental em blocos casualizados em esquema fatorial 3 x 2 + 1, sendo três doses de calcário calcinado, duas doses de lodo de esgoto e urna testemunha adicional, com três repe tiçSes. Procedeu-se à análise de variáncia e ao teste Tukey a 5% de probabilidade. As diferentes doses de calcário proporcionaram maiores acúmulos de macronutrientes na parte aérea e micronutrientes ñas...
Tipo: Journal article
Palavras-chave: Gossypium hirsutum; Biossólido; Calagem; Elementos traço; Resíduo orgânico.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000100006

Algorithms of Expert Classification Applied in Quickbird Satellite Images for Land Use Mapping
Provedor de dados: 117
Autores: Perea,Alberto Jesús; Meroño,José Emilio; Aguilera,María Jesús.
The objective of this paper was the development of a methodology for the classification of digital aerial images, which, with the aid of object-based classification and the Normalized Difference Vegetation Index (NDVI), can quantify agricultural areas, by using algorithms of expert classification, with the aim of improving the final results of thematic classifications. QuickBird satellite images and data of 2532 plots in Hinojosa del Duque, Spain, were used to validate the different classifications, obtaining an overall classification accuracy of 91.9% and an excellent Kappa statistic (87.6%) for the algorithm of expert classification.
Tipo: Journal article
Palavras-chave: Expert classification; Vegetation index; Land cover; Object-based classification.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300013

Algoritmo Matemático para Cuantificar Directamente el Ángulo de Convergencia en Preparaciones de Dientes Artificiales
Provedor de dados: 77
Autores: Flores,Marco; Lebrecht,Walter; Figueroa,Rodolfo.
El objetivo de este trabajo fue determinar un algoritmo matemático para cuantificar directamente el ángulo de convergencia (AC) en troqueles de preparaciones dentarias. El modelo experimental consistió en preparaciones coronarias simuladas sobre troqueles de yeso, en el cual el AC fue calculado por tres formulas trigonométricas. Las formulas fueron obtenidas de un modelo matemático en el cual la preparación coronaria representa una forma de pirámide truncada, la cual permite una proyección triangular en un plano. Fueron realizadas 60 mediciones in situ sobre las paredes de 15 troqueles. Se obtuvo una imagen de cada troquel usando una cámara digital (Schick® CDR). El AC fue medido usando la herramientas del software (Control). Los datos fueron analizados...
Tipo: Journal article
Palavras-chave: Prótesis; Corona dentaria; Preparación coronaria; Ángulo de convergencia; Modelo matemático.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400007

Algunas Técnicas Microhistolóigcas Utilizadas en la Determinación de la Composición Botánica de Dietas de Herbívoros
Provedor de dados: 113
Autores: Castellaro G,Giorgio ; Squella N,Fernando ; Ullrich R,Tamara   ; León C,Felipe ; Raggi S,Alberto .
En este trabajo se describen diferentes técnicas microhistológica para estudiar la dieta de herbívoros silvestres y domésticos. Los métodos de obtención de epidermis se aplicaron a las principales especies vegetales de praderas mediterráneas y altiplánicas, evaluando el grado de resolución en la identificación y caracterización de ellas. En la mayoría de las especies poáceas y graminoides, la obtención de la epidermis se realizó mediante raspado y no presentó complicación, siendo posible la identificación a nivel de especie basándose en las características de la pared celular, el tamaño y forma celular, presencia y forma de las células de corcho y de sílice, y presencia y forma de los tricomas. En poáceas de epidermis muy duras fue necesario un tratamiento...
Tipo: Journal article
Palavras-chave: Identificación de géneros; Identificación de especies; Praderas altiplánicas; Pradera mediterránea anual; Técnica microhistológica; Tejido epidérmico.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000100011

ALIMENTACION DE ODONTESTHES BONARIENSIS (CUVIER Y VALENCIENNES 1835) (ATHERINIFORMES, ATHERINIDAE) EN LA LAGUNA SALADA DE MAR CHIQUITA (CORDOBA, ARGENTINA)
Provedor de dados: 72
Autores: Sagretti,Luis; Bistoni,María de los Angeles.
Se analizó el contenido estomacal de 258 individuos de pejerrey Odontesthes bonariensis, con el objeto de estudiar los hábitos alimentarios de esta especie en un ambiente de características particulares debido a su extensión y elevada salinidad. El material fue recolectado en la costa sur de la laguna Mar Chiquita, en muestreos con frecuencia estacional durante 1994-1995. Se determinó el espectro trófico, estableciéndose para cada ítem la frecuencia de ocurrencia, abundancia y volumen. Se calculó el Indice de Importancia Relativa (IRI). El pejerrey preda principalmente sobre organismos animales. Se encontraron variaciones en el componente principal de la dieta de acuerdo a la longitud alcanzada por el pejerrey, observándose una marcada ictiofagia en...
Tipo: Journal article
Palavras-chave: Alimentación; Atherinidae; Ictiófago; Mar Chiquita.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000100006

ALIMENTACION DEL CALAMAR ILLEX ARGENTINUS (CEPHALOPODA, OMMASTREPHIDAE) EN LA ZONA COMUN DE PESCA ARGENTINO-URUGUAYA
Provedor de dados: 72
Autores: Bazzino,Gastón; Quiñones,Renato A.
En el presente trabajo, se analiza la variabilidad entre sexos, clases de tamaño, y grados de madurez sexual en la composición de la dieta y en la intensidad de alimentación del calamar Illex argentinus en la Zona Común de Pesca Argentino-Uruguaya (ZCPAU). Durante septiembre y octubre de 1998 se examinó, a nivel macroscópico, el contenido estomacal de 6369 ejemplares de Illex argentinus a bordo de tres buques pesqueros calamareros (poteros), determinándose el ítem presa dominante en cada estómago analizado (dieta basada en ítem presa dominante, DBIPD). Los resultados obtenidos en este estudio conducen a postular que: (i) la composición de la dieta del calamar en la ZCPAU estuvo dominada por crustáceos, (ii) los bajos niveles de canibalismo sugieren una...
Tipo: Journal article
Palavras-chave: Calamar Illex argentinus; Composición de la dieta; Intensidad de alimentación; Zona Común de Pesca Argentino-Uruguaya.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200010

Alimentación del cisne de cuello negro Cygnus melanocoryphus (Aves: Anatidae) en un humedal marino de Chiloé, sur de Chile
Provedor de dados: 72
Autores: CURSACH,JAIME A; RAU,JAIME R; TOBAR,CLAUDIO; VILUGRÓN,JONNATHAN; DE LA FUENTE,LUCIA E.
El considerar a Cygnus melanocoryphus como un herbívoro generalista que se alimenta de las algas y pastos marinos más abundantes en los humedales - entre ellos los costeros - que habita, permite suponer la existencia de interacciones aún no reportadas entre esta ave acuática y los cultivadores de algas marinas del sur de Chile, por ello el objetivo de este estudio fue conocer la alimentación de C. melanocoryphus en un humedal marino del sur de Chile, en donde tradicionalmente se ha realizado el cultivo del alga pelillo (Gracillaria chilensis). El trabajo se desarrolló durante el invierno de 2011 en el humedal marino de bahía Caulín (41º49&amp;#8217;S; 73º38&amp;#8217;O), en isla grande de Chiloé, sur de Chile. C. melanocoryphus destinó la mayor parte de su...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200003

ALIMENTACION Y CONDUCTA ALIMENTARIA DE LA ALMEJA DE AGUA DULCE DIPLODON CHILENSIS (BIVALVIA: HYRIIDAE)
Provedor de dados: 72
Autores: Lara,Gladys; Parada,Esperanza; Peredo,Santiago.
Con el propósito de conocer cualitativamente la alimentación y la conducta alimentaria de la almeja de agua dulce Diplodon chilensis, se analizó mediante estudios de laboratorio y de campo el comportamiento alimentario y el contenido digestivo de especímenes procedentes de sustratos areno-pedregosos y arenosos del Lago Panguipulli y se relacionó con la oferta ambiental existente en el sustrato (fitobentos) y en el agua (fito-plancton). El análisis del contenido digestivo de los especímenes y los resultados experimentales, indican que Diplodon chilensis tiene una alimentación mixta en base a fitoplancton, fitobentos y materia orgánica existente en el plancton y en el bentos
Tipo: Journal article
Palavras-chave: Almeja de agua dulce; Diplodon chilensis; Alimentación; Conducta alimentaria; Fitobentos; Fitoplancton; Chile; Argentina.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200004

Allelic variation at the Vrn-A1, Vrn-B1, Vrn-D1, Vrn-B3 and Ppd-D1a loci of Pakistani spring wheat cultivars
Provedor de dados: 69
Autores: Iqbal,Muhammad; Shahzad,Armghan; Ahmed,Iftikhar.
Flowering time in bread wheat (Triticum aestivum L.) is controlled by vernalization and photoperiod response, and earliness per se genes. The genetic basis of flowering time has not been investigated in Pakistani bread wheat. This study was, therefore, conducted to determine the allelic composition at Vrn-A1, Vrn-B1, Vrn-D1, Vrn-B3 and Ppd-D1a loci of 59 Pakistani spring bread wheat cultivars. These cultivars, along with 4 isogenic lines for vernalization genes were characterized with previously reported DNA markers designed for detecting allelic variation at 4 Vrn (Vernalization) and 1 Ppd (Photoperiod) loci. Spring habit Vrn-A1a allele was found in 36% cultivars either alone or with spring habit Vrn-B1 and Vrn-D1 alleles. Two wheat cultivars had the...
Tipo: Journal article
Palavras-chave: Photoperiod; Spring growth habit; Triticum aestivum; Vernalization.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100001

Allelopathic Activity of Crop Residue Incorporation Alone or Mixed Against Rice and its Associated Grass Weed Jungle Rice (Echinochloa colona [L.] Link)
Provedor de dados: 117
Autores: Khaliq,Abdul; Matloob,Amar; Ata Cheema,Zahid; Farooq,Muhammad.
Weed suppression is one of the several benefits achieved by soil incorporation of crop residues and such suppression is believed to be allelopathic in nature. The allelopathic potential of different crop residues: viz. sorghum (Sorghum bicolor [L.] Moench), sunflower (Helianthus annuus L.), brassica (Brassica campestris L.) was evaluated in rice (Oryza sativa L.) and jungle rice (Echinochloa colona [L.] Link). Chopped crop residues were soil-incorporated alone and mixed at 6 g kg-1 soil (12 t ha-1) and compared with a control without residues. Soil incorporation of residues substantially delayed germination of jungle rice. The time to start germination, time to 50% emergence, mean emergence time, emergence index, and final germination percentage were all...
Tipo: Journal article
Palavras-chave: Residues; Allelopathy; Sorghum; Sunflower; Brassica; Weed control.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300012

Allelopathic effect of the invasive Acacia dealbata Link (Fabaceae) on two native plant species in south-central Chile
Provedor de dados: 73
Autores: AGUILERA,NARCISO; BECERRA,JOSÉ; GUEDES,LUBIA M.; VILLASEÑOR-PARADA,CRISTOBAL; GONZÁLEZ,LUIS; HERNÁNDEZ,VÍCTOR.
Plant species that growth close to or under the canopy of Acacia dealbata Link (Fabaceae, subfamily: Mimosoideae) within its non-native range, survive with difficulty or not at all, especially if they are native. This phenomenon has been attributed to allelopathy; one of the strategies used by A. dealbata to trigger an invasion process. Native species Quillaja saponaria Molina (tree) and Helenium aromaticum (Hook.) H.L. Bailey (herb), share A. dealbata’s range in South-central Chile. This study was performed on the Mediterranean Biobío Region of Chile. We evaluated the effect of leaves, flowers, pods and seeds of A. dealbata on the germination and early growth of these native species. Biological assays were carried out under laboratory conditions, based on...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200007

Allelopathic effects of aqueous and organic fractions of Euphorbia dracunculoides Lam. on germination and seedling growth of chickpea and wheat
Provedor de dados: 117
Autores: Tanveer,Asif; Kamran Jabbar,Muhammad; Kahliq,Abdul; Matloob,Amar; Nadeem Abbas,Rana; Mansoor Javaid,Muhammad.
Identification of weed species with allelopathic potential and characterization of their adverse effects against associated crops is required for better understanding of weed-crop interactions. Phytotoxic activity of Euphorbia dracunculoides Lam. on germination and seedling growth of chickpea (Cicer arietinum L.) and wheat (Triticum aestivum L.) was investigated under controlled conditions. Two separate studies were done with each of four organic solvent fractions (n-hexane, chloroform, ethylacetate, 1-butanol) and crude aqueous (1:10 and 1:20) whole plant fractions of E. dracunculoides using distilled water and 0.05% (v/v) dimethyl sulfoxide (DMSO) as control. Different aqueous and organic fractions of E. dracunculoides had a significant bearing on...
Tipo: Journal article
Palavras-chave: Allelopathy; Weeds; Germination attributes; Suppression; Phenolics.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400006

Allelopathic Effects of Sunflower Residue on Growth of Rice and Subsequent Wheat Crop
Provedor de dados: 117
Autores: Bashir,Uzma; Javaid,Arshad; Bajwa,Rukhsana.
Sunflower (Helianthus annuus L.) is a well known allelopathic plant species. However, Pakistani farmers generally incorporate the sunflower residue in the soil with the aim to enhance soil fertility and organic matter. Field experiments were, therefore, carried out to evaluate the effect of sunflower residue incorporation on growth and yield of rice (Oryza sativa L.) and subsequent wheat (Triticum aestivum L.) crop. For rice crop, there were four treatments viz. control, sunflower residue incorporation (RI), NPK fertilizers, and NPK+RI. Two rice varieties (Basmati Pak and Basmati Super) were cultivated. Incorporation of sunflower residue markedly reduced plant growth and yield in 'Basmati Pak'. There was 34% reduction in yield of this variety due to RI....
Tipo: Journal article
Palavras-chave: Allelopathy; Genotypic tolerance; Oryza sativa; Helianthus annuus; Triticum aestivum.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300004

Allochthonous and autochthonous components from gizzard grit of Theristicus melanopis in anthropogenic pastures of southern chile
Provedor de dados: 72
Autores: Gantz,Alberto; Valdivia,Carlos E; Yañez,Miguel; Sade,Soraya.
Numerous vertebrates, and in particular birds, ingest stones (geo-gastrolites) to favour the breakdown and digestion of food in the muscular stomachs. Between 1993 and 1994 we evaluated the quantity, relative abundance and quality of autochthonous (geo-gastrolites) and allochthonous (pieces of glass) components of the grit in gizzards of black-faced ibis (Theristicus melanopis) inhabiting the pastures of southern Chile. Grit elements were present in 32 out of 48 (66,7%) of all gizzard analysed. A total of 572 particles were recorded from which, 69.1% corresponded to autochthonous elements and 27.8% were allochthonous particles. Both components are similar in shape; however glass contributes considerably more in terms of mass. Gender differences reveal that...
Tipo: Journal article
Palavras-chave: Black-faced ibis; Glasses; Gastrolites; Pastures; South Chile.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100003

Allometric scaling of biological rhythms in mammals
Provedor de dados: 48
Autores: Günther,Bruno; Morgado,Enrique.
A wide spectrum of cyclic functions in terrestrial mammals of different size, from the 3-gram shrew to the 3-ton elephant, yields an allometric exponent around 0.25, which is correlated _ as a kind of common denominator _ with the specific metabolic rate. Furthermore, the applicability of these empirical findings could be extrapolated to chronological events in the sub-cellular realm. On the other hand, the succession of growth periods (T98%) until sexual maturity is reached also follows the 1/4 power rule. By means of Verhulst's logistic equation, it has been possible to simulate three different biological conditions, which means that by modifying the numerical value of only one parameter, revertible physiological and pathological states can be obtained,...
Tipo: Journal article
Palavras-chave: Growth; Dimensional analysis; Specific metabolic rate; Logistic equation; Homeostasis.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000200010

Allozymic variation in the clam genus Eurhomalea (Bivalvia: Veneriidae) along southern South American coast
Provedor de dados: 97
Autores: GALLARDO,M.H; GONZÁLEZ,C; MENA,C; LOMOVASKY,B; MORRICONI,E; CLASING,E.
The correspondence between allozymic variation and specific differentiation was studied in four populations corresponding to the three nominal, allopatric species of clam genus Eurhomalea (E. rufa, E. lenticularis, E. exalbida) described for southern South America. Allozyme variation scored in 12 loci was high as indicated by heterozygosity levels (15.8-20.7 %) and by the presence of only three monomorphic loci (Hk-2, Icd-2, and Xdh-1). These high estimates of allelic variability were influenced by the low levels of interspecific genetic similarity (I = 0.64) and for the high conspecific values of genetic identity observed. The high estimates of substructuring found at the species level (F ST = 0.39) contrasted with the low differentiation (F ST = 0.027)...
Tipo: Journal article
Palavras-chave: Allozymic variation; Genetic structure; Taxonomic status.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300013

Alpinia oxyphylla Miq. extract changes miRNA expression profiles in db-/db- mouse kidney
Provedor de dados: 48
Autores: Du,Guankui; Xiao,Man; Zhang,Xuezi; Wen,Maoyu; Pang,Chi; Jiang,Shangfei; Sang,Shenggang; Xie,Yiqiang.
Abstract  Background A number of dysregulated miRNAs have been identified and are proposed to have significant roles in the pathogenesis of type 2 diabetes mellitus or renal pathology. Alpinia oxyphylla has shown significant anti-inflammatory properties and play an anti-diabetes role. The objective of this study was to detect the alteration of miRNAs underlying the anti-diabetes effects of A. oxyphylla extract (AOE) in a type II diabetic animal model (C57BIKsj db-/db-).  Results Treatment with AOE for 8 weeks led to lower concentrations of blood glucose, urine albumin, and urine creatinine. 17 and 13 miRNAs were statistically identified as differentially regulated in the DB/DB and db-/db- AOE mice, respectively, compared to the untreated db-/db- mice. Of...
Tipo: Journal article
Palavras-chave: MiRNA; Db-/db- mice; Alpinia oxyphylla Miq; Kidney; Diabetic nephropathy.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100206

Alstroemeria hookeri Lodd. subsp. sansebastiana C.M.Baeza &amp;amp; E.Ruiz, nueva para la flora de Chile
Provedor de dados: 73
Autores: BAEZA,CARLOS M; RUIZ,EDUARDO.
We describe a new subspecies of Alstroemeria hookeri in Chile. This new species grows in the central Valley of the Region of Bío-Bío, Chile. It differs from the typical subspecies by its larger size, lighter-colored flowers and different geographical distribution.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200019

Alstroemeria presliana Herb. (Alstroemeriaceae) in Chile from a Cytogenetic Perspective
Provedor de dados: 117
Autores: Baeza,Carlos M; Schrader,Otto; Ruiz,Eduardo; Negritto,M.
Alstroemeria (Alstroemeriaceae) is an endemic genus of South America with two major distribution centers in the continent: Chile and Brazil. In Chile the genus is distributed from the North, near Iquique (20º13’ S, 70º09’ W) to the Chilean and Argentine Patagonia (53º10’ S, 70º54’ W). The central zone of Chile presents the highest number of species. A. presliana Herb. grows from Curicó (34º59’ S, 71º14’ W) to Cautín (38º45’ S, 72º34’ W) in Chile and Neuquén (36º50’ S, 71º05’ W), Argentina. A comparative karyotype study was made between a population of A. presliana subsp. presliana and a population of A. presliana subsp. australis Ehr. Bayer. Both populations presented asymmetric karyotypes, with 2n = 2x = 16 chromosomes, but with different chromosome...
Tipo: Journal article
Palavras-chave: Alstroemeriaceae; Karyotype; Chromosome numbers; Chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400002

Alteraciones del paisaje ecológico araucano por la asimilación mapuche de la agroganadería hispano-mediterránea (siglos XVI y XVII)
Provedor de dados: 97
Autores: TORREJÓN,FERNANDO; CISTERNAS,MARCO.
Las características biogeográficas de la América templada favorecieron la introducción y propagación de especies animales y vegetales que sustentaron al modelo agroganadero hispano-mediterráneo. Los efectos de este fenómeno generaron alteraciones ecológicas, especialmente en los territorios habitados por aborígenes carentes de actividades productivas intensivas, como fue el caso de la Araucanía. Mediante un análisis histórico documental, la presente investigación reconoció las principales características del proceso de alteración del paisaje ecológico araucano entre los siglos XVI y XVII: (i) en el siglo XVI, la introducción de especies exóticas desarticuló el sistema económico mapuche, (ii) tanto la relativa pristinidad de la Araucanía como el proceso...
Tipo: Journal article
Palavras-chave: Ecología del paisaje; Introducción de especies; Colonización española; Araucanía; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400008

Alteraciones en la Erupción de Caninos Permanentes
Provedor de dados: 77
Autores: Pérez Flores,María Antonieta; Pérez Flores,Pablo; Fierro Monti,Claudia.
En este trabajo son descritas alteraciones en la erupción de los caninos permanentes, su etiología, diagnóstico temprano y posibilidades terapéuticas. El canino recoge todos los problemas de espacio que puedan existir en la arcada y es frecuente la erupción en una zona alta. La inclusión de los caninos tiene una etiología compleja, favorecida por factores evolutivos, anatómicos y mecánicos. La impactación mandibular es menos frecuente y su incidencia se describe como veinte veces menos que la impactación del canino maxilar. La erupción ectópica de los caninos maxilares puede estar asociada a la reabsorción de las raíces de los incisivos adyacentes. A la edad de 8 a 10 años empieza a palparse la prominencia del canino en el fondo del vestíbulo. Los métodos...
Tipo: Journal article
Palavras-chave: Erupción ectópica; Canino.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100025

Alteraciones Morfológicas del Bazo de Ratas (Rattus norvergicus), Tratadas con Trióxido de Arsénico
Provedor de dados: 77
Autores: Alfaro-Burgos,S.
En América Latina la presencia del arsénico en el ambiente y en las fuentes de agua para consumo humano, se debe a factores naturales de origen geológico como a actividades antropogénicas. El arsénico en las aguas naturales se encuentra principalmente como trivalente (arsenito) o pentavalente (arsenato). El objetivo de este trabajo fue determinar las alteraciones que provoca el trióxido de arsénico a nivel de la morfología del bazo de ratas (Rattus norvegicus - Sprague-Dawley). Se utilizaron 24 ratas de ambos sexos de 55 días de vida. Las ratas fueron pesadas y divididas en 3 grupos (4 hembras y 4 machos). Los grupos tratados fueron inyectados con 5 mg y 10 mg de As2O3 respectivamente, en dosis única diaria vía intraperitoneal por 15 días. Al grupo control...
Tipo: Journal article
Palavras-chave: Bazo; Trióxido de arsénico; Pulpa blanca; Pulpa roja; Rattus norvegicus.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300039

Alteraciones Morfológicas en Dientes Sometidos a Altas Temperaturas con Interés Forense
Provedor de dados: 77
Autores: Rubio,Leticia; Sioli,José Manuel; Santos,Ignacio; Fonseca,Gabriel M; Martin-de-las-Heras,Stella.
Los dientes son los elementos más resistentes del esqueleto humano y son utilizados en muchas ocasiones en la rutina de los laboratorios forenses. El objetivo de este estudio fue describir los cambios dentarios estructurales, morfológicos y del color que se producen tras la incineración, para ayudar en el manejo adecuado de las muestras en un escenario forense. Setenta dientes fueron expuestos a intervalos de temperatura de 100 °C a 1200 °C, durante 60 min. Un grupo control de 10 dientes no fue expuesto al choque térmico. Después de la incineración, los dientes fueron fotografiados y radiografiados para evaluar visualmente los cambios morfológicos. La medida del cambio de color fue realizada mediante un espectrofotómetro. Los resultados mostraron cambios...
Tipo: Journal article
Palavras-chave: Diente calcinado; Cambios color; Rayos-X; Morfología; Espectrofotometría.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200047

Alteraciones Morfológicas en el Tracto Respiratorio de Ratas Wistar Inducidas por Vapores de la Raíz de Hierba del Zorrillo (Petiveria alliacea) del Suroeste de México
Provedor de dados: 77
Autores: Fletes-Arjona,Víctor M; Soto-Domínguez,Adolfo; García-Garza,Rubén; Morán-Martínez,Javier; Benítez-Valle,Carlos; Castañeda-Martínez,Alfonso; Montalvo-González,Rubén; Becerra-Verdín,Eduardo M.
Petiveria alliacea, es conocida con diferentes nombres según el lugar donde se le encuentre. Estudios con hojas, tallo, raíz o extractos describen múltiples usos medicinales. Sin embargo, son pocos los que describen efectos tóxicos. En este estudio se evaluó el efecto morfológico de los vapores de la raíz de P. alliacea sobre el tracto respiratorio de ratas Wistar. Se emplearon 15 ratas divididas en 5 grupos (n=3): control absoluto, 0, 5, 15 y 30 minutos post-exposición (grupos I-V, respectivamente). Las ratas se sacrificaron y se colectaron muestras representativas del tracto respiratorio que posteriormente se procesaron por la técnica histológica convencional, hasta su inclusión en bloques de parafina. Los cortes histológicos se tiñeron con H-E,...
Tipo: Journal article
Palavras-chave: Petiveria alliacea; Alteraciones morfológicas; Tracto respiratorio.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100019

Alteraciones Motoras Esofágicas en Pacientes con Síndrome de Sjögren: Estudio de Casos y Controles
Provedor de dados: 77
Autores: Manterola,Carlos; Otzen,Tamara.
El síndrome de Sjögren primario (SSp), afecta diversos sistemas, como el digestivo; destacando la dificultad deglutoria del bolo alimentario. El objetivo de este estudio es describir la función y motilidad esofágica de pacientes con SSp y compararla con sujetos sanos. Estudio de casos y controles, realizado en Clínica Mayor de Temuco (2004-2009). Se estudiaron pacientes con SSp, con disfagia permanente, sin límite de edad ni sexo (casos); y sujetos asintomáticos digestivos (controles); emparejados por edad y sexo. Se estudiaron con manometría esofágica estacionaria. Se determinó presión de reposo (PR) y longitud (L) del esfínter esofágico inferior (EEI) y superior (EES); amplitud (A) y duración (D) de las ondas peristálticas desencadenadas con degluciones...
Tipo: Journal article
Palavras-chave: Síndrome de Sjogren; Enfermedades esofágicas; Manometría esofágica; Estudios de casos y controles.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100041

Alteration of Dentate Gyrus Astrocytes in Diabetic Rats: Protective Role of Urtica dioica
Provedor de dados: 77
Autores: Golalipour,Mohammad Jafar; Ghafari,Soraya; Latifimoghadam,Mohammad Hossein; Kaboli,Sakineh.
Diabetes mellitus can cause astrocytes alterations in the central nervous system. Urtica dioica (Nettle) is among several species listed for their use against diabetes in folk medicine. Therefore, this study was done to evaluate the protective effect of Urtica dioica on astrocytes density of the dentate gyrus in STZ induced diabetic rats. In this experimental study, 21 male albino Wistar rats were randomly allocated equally into normal, diabetic and protective (nettle treated diabetic) groups. Hyperglycemia was induced by streptozotocin (80 mg/kg) in the animals of diabetic and treatment groups. Before induction of diabetes in animals, animals in protective group received hydroalcoholic extract of Urtica dioica (100 mg/kg/BW /day) for five days...
Tipo: Journal article
Palavras-chave: Diabetes; Astrocyte; Urtica dioica; Dentate gyrus.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400039

ALTERATION OF NITROGEN CYCLING BY AGRICULTURAL ACTIVITIES, AND ITS ENVIRONMENTAL AND HEALTH CONSEQUENCES
Provedor de dados: 73
Autores: Cleemput,Oswald van; Boeckx,Pascal.
The food demands of the increasing world population puts pressure on land use and N availability. In this paper an overview is given of the different N cycling processes affected by agricultural activities. Of the amount of N added to the soil, about half is removed from the field as harvested crop, while the remainder of the N is incorporated into soil organic matter or is lost to other parts of the environment. During the last decades there has been much research on environmental consequences of agricultural activities, mainly on emission of gaseous N compounds (NH3, NO, N2O and N2), but also on N leaching, runoff and erosion. Study of the factors controlling loss of N is complex because of their multiplicity and mutual interactions. More recently...
Tipo: Journal article
Palavras-chave: Acidification; Drinking water; Eutrophication; Greenhouse effect; Nitrogen loss; Ozone.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200005

Alteration of the Reproductive Patterns in Drosophila melanogaster by Effects of High Concentrations of Boron on In Vitro Cultured Medium
Provedor de dados: 77
Autores: Espinoza-Navarro,O; Rodríguez,H; Rodríguez,M; Silva,E; Luque,A.
The objective of this study was to evaluate the effects of boron (B) using as a biological model Drosophila malanogaster. Analizing specifically the responses over descendency to doses of 6,0 and 12 mg/L, comparing a control group which culture medium was prepared with water with boron concentrations of 0,6 mg/L, according to World Health Organization. The results show a significative alteration in the number of descendency from F1 to F3 and then a tendency to normalization in F4 and F5. Also a significant change in proportions between the males and females, with an acute effect on F1 and then a possible chronic effect from F2 to F5, increasing the proportion of females over males. This differences between genders are significant only until F4, on F5 these...
Tipo: Journal article
Palavras-chave: Reproduction; Boron; Reproductive toxicology; Drosophila melanogaster.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300021

Alterations in core histone variant ratios during maize root differentiation, callus formation and in response to plant hormone treatment
Provedor de dados: 48
Autores: ALATZAS,ANASTASIOS; FOUNDOULI,ATHINA.
Although several histone variants have been studied in both animal and plant organisms, little is known about their distribution during processes that involve alterations in chromatin function, such as differentiation, dedifferentiation and hormone treatment. In this study we evaluated the ratio of each histone variant in each of the four core histone classes in the three developmental zones of maize (Zea mays L.) root and in callus cultures derived from them, in order to define possible alterations either during plant cell differentiation or dedifferentiation. We also evaluated core histone variant ratios in the developmental zones of roots treated with auxin and gibberellin in order to examine the effects of exogenously applied plant hormones to histone...
Tipo: Journal article
Palavras-chave: Callus culture; Histone variant; Plant cell differentiation; Plant hormone; Zea mays.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000400006

Alterations of the Antioxidant Enzyme Activities are not General Characteristics of the Colonization Process by Arbuscular Mycorrhizal Fungi
Provedor de dados: 117
Autores: Rodríguez,Yakelin; Vierheilig,Horst; Mazorra,Luis M.
Antioxidant system is involved in arbuscular mycorrhizal symbiosis, but its role during the colonization process is still poorly understood. To gain new insights into the role of antioxidant system during root colonization by arbuscular mycorrhizal fungi, the activities of key antioxidant enzymes were evaluated in tomato (Solanum lycopersicum L.) roots inoculated with six strains of different genera and species: two Glomus mosseae, Glomus cubense, Glomus intraradices, Glomus sp. and Acaulospora scrobiculata. Glomus cubense and A. scrobiculata strains reached the highest infectivity levels with maximum values of colonization frequency and intensity of 29-10.88% and 18-9.20%, respectively; G. mosseae strains showed an intermediate infectivity, both with 15%...
Tipo: Journal article
Palavras-chave: Peroxidases; Polyphenol oxidases; Superoxide dismutase; Colonization intensity; Solanum lycopersicum.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300016

Alterations of the Giant Pyramidal Neurons (Betz Cells) in Brain Cortex of Rat Offspring Born from Gestational Diabetic Dams: A Morphometric Study
Provedor de dados: 77
Autores: Ghafari,Soraya; Golalipour,Elnaz; Golalipour,Mohammad Jafar.
A few studies reported the adverse effects of gestational diabetes on hippocampus and spinal cord of rat offspring. Giant pyramidal neurons are giant pyramidal neurons located in fifth layers of the gray matter in the primary motor cortex. Therefore, this study was conducted to determine the effect of gestational diabetes on the giant pyramidal neurons and the thickness of internal pyramidal layer in the brain cortex of rat offspring. On day 1 of gestation, 10 Wistar rat dams were randomly allocated into two control and diabetic groups. Five animals in diabetic group received 40 mg/kg/BW of Streptozotocin (intraperitoneally) and control animals received normal saline. We randomly selected six offspring of every subject in both groups at day 28, 56 and 84....
Tipo: Journal article
Palavras-chave: Gestational diabetes; Neuron; Giant pyramidal neurons; Cerebral cortex; Rat offspring.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300049

Altered calcium currents in cultured sensory neurons of normal and trisomy 16 mouse fetuses, an animal model for human trisomy 21 (Down Syndrome)
Provedor de dados: 48
Autores: CAVIEDES,PABLO; CAVIEDES,RAÚL; RAPOPORT,STANLEY I.
Down syndrome is determined by the presence of an extra copy of autosome 21 and is expressed by multiple abnormalities, with mental retardation being the most striking feature. The condition results in altered electrical membrane properties of fetal dorsal root ganglia (DRG) neurons, as in the trisomy 16 fetal mouse, an animal model of the human condition. Cultured trisomic DRG neurons from human and mouse fetuses present faster rates of depolarization and repolarization in the action potential compared to normal controls and a shorter spike duration. Also, trisomy 16 brain and spinal cord tissue exhibit reduced acetylcholine secretion. Therefore, we decided to study Ca2+ currents in cultured DRG neurons from trisomy 16 and age-matched control mice, using...
Tipo: Journal article
Palavras-chave: Trisomy 16; Dorsal root ganglion; Calcium current; Tissue culture; Patch clamp; Down syndrome.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000300009

Altered dopamine levels induced by the parasite Profilicollis antarcticus on its intermediate host, the crab Hemigrapsus crenulatus
Provedor de dados: 48
Autores: ROJAS,JOSÉ MIGUEL; OJEDA,F. PATRICIO.
A serotonergic pathway is apparently involved in parasite-host interactions. Previous studies conducted in our laboratory showed increased rates in oxygen consumption and alterations in body posture in the crab Hemigrapsus crenulatus parasitized by the acanthocephalan, Profilicollis antarcticus. Such changes may be related to the functions described for biogenic amines in crustaceans. During the infective stage the acanthocephalans live freely in the hemocelomic cavity, suggesting that the possible alteration induced by biogenic amines may be related to their neurohormonal function in crustaceans. To test whether the presence of P. antarcticus produced neurohormonal changes in its intermediate host, H. crenulatus, we analyzed serotonin and dopamine levels...
Tipo: Journal article
Palavras-chave: Acanthocephalans; Biogenic amines; HPLC; Parasite-host interaction; Parasite transmission.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000200015

Altered Kidney Morphology and Enzymes in Streptozotocin Induced Diabetic Rats
Provedor de dados: 77
Autores: Zafar,Muhammad; Naeem-ul-Hassan Naqvi,Syed; Ahmed,Masood; Kaimkhani,Zahid Ali.
We studied the effects of streptozotocin (STZ)-induced diabetes on kidney morphology, anatomy, architecture and on the activities of aminotransferases (AST and ALT), alkaline phosphatase (ALP) and pseudocholinesterase (PChE) in albino rats. The aim of the study was to investigate the association between diabetic kidney complications and kidney enzyme alterations. This study was performed in the Department of Anatomy and Institute of Pharmaceutical Sciences, Baqai Medical University, Karachi and Pathology department of College of Physicians &amp;amp; Surgeons (CPSP) Pakistan in 2007-08. Diabetes was induced by a single dose of STZ (45 mg/kg, b.w.) given intraperitoneally in sodium citrate buffer at pH 4.5. Eighty (80) albino rats were divided into five...
Tipo: Journal article
Palavras-chave: Streptozotocin; Aminotransferases; Alkaline phosphatase; Pseudocholinesterase; STZ-diabetes; Rats.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300024

Altered Levels of Nodal Excitability by Rate-Dependent Inhibitory Effects of Essential Oil of Citrus aurantium on the Electrophysiological Properties of Isolated Perfused Rabbit AV-Node: Protective Role in the Prevention of Ouabain Toxicity
Provedor de dados: 77
Autores: Khori,Vahid; Nayebpour,Mohsen; Mansourian,Azad Reza; Davarian,Ali; Naseri,Mohsen; Salehi,Aref; Alizadeh,Ali-Mohamad.
Treatment of supraventricular arrhythmia includes a wide range of medical interventions. Herbal remedies are suitable alternatives to synthetic drugs due to their availability, minimal side effects and lower price. Pharmacological studies and traditional medical literature point to the cardiovascular effects of Citrus aurantium L. (Rutaceae) in many instances. In the present study we used isolated perfused AV-node of rabbit as an experimental model to determine the effect of various concentrations of essential oil of C. aurantium (0.1-0.3 v/v) on the nodal conduction time and refractoriness of an isolated rabbit AV-nodal preparations. Selective stimulation protocols were used to independently quantify AV nodal recovery, facilitation and fatigue in 18...
Tipo: Journal article
Palavras-chave: Citrus aurantium; Isolated AV-node; Arrhythmia; Herbal drugs.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200019

Altered Liver Morphology and Enzymes in Streptozotocin Induced Diabetic Rats
Provedor de dados: 77
Autores: Zafar,Muhammad; Naeem-ul-Hassan Naqvi,Syed; Ahmed,Masood; Kaimkhani,Zahid Ali.
This study was undertaken to evaluate the relationship and effects of diabetes on liver morphology, architecture and function. The hepatic effects of diabetes were evaluated in vivo using streptozotocin (STZ)-induced diabetic rats as an experimental model. The degree of hepatic dysfunction was measured by using biochemical parameters like serum transaminases (ALT and AST), alkaline phosphatase (ALP)and pseudocholinesterase (PChE) while the histopathological studies were carried out to support the enzymic Parameters. The aim of the study was to investigate the association between diabetic hepatic complications and liver enzyme alterations. This study was performed in the Department of Anatomy; Institute of Pharmaceutical Sciences and Institute of...
Tipo: Journal article
Palavras-chave: Streptozotocin; Aminotransferases; Alkaline phosphatase; Pseudocholinesterase; STZ-diabetes; Hepatic injury.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300015

Altered Testicular Morphology and Oxidative Stress Induced by Cadmium in Experimental Rats and Protective Effect of Simultaneous Green Tea Extract
Provedor de dados: 77
Autores: El-Shahat,Abd El-Rahman; Gabr,Attia; Meki,Abdel-Raheim; Mehana,El-Saed.
Cadmium (Cd), is an environmental and industrial pollutant that affects the male reproductive system. Cd induces its effect by affecting tissue antioxidant enzyme systems. Green tea extract (GTE) is an antioxidant and free radicals scavenger and has a chelating property. The purpose of this study was to investigate the protective effect of GTE against testes damage induced by Cd. Four groups of male rats, were utilized as following: Controls, GTE treated, Cd treated and Cd + GTE, treated rats at the same doses. The rats received GTE and or Cd orally in drinking water. After 5 weeks, the animals were sacrificed and testes were removed for microscopic and Biochemical evaluation. The levels of lipid peroxides (LPO) and glutathione (GSH) were detected in the...
Tipo: Journal article
Palavras-chave: Rat Testes; Cadmium toxicity; Green tea extract; Lipid peroxides; Glutathione.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300020

Alternative management of a problematic weed of wheat Avena fatua L. by metabolites of Trichoderma
Provedor de dados: 117
Autores: Javaid,Arshad; Ali,Sajjad.
Wild oat (Avena fatua L.) is a problematic weed of wheat (Triticum aestivum L.) in Pakistan. The present study was designed to evaluate the herbicidal activity of culture filtrates of four Trichoderma spp., namely T. harzianum, T. pseudokoningii, T. reesei and T. viride, against this weed species. In a laboratory bioassay, original (100%) and diluted (50%) culture filtrates of T. harzianum and T. pseudokoningii significantly reduced shoot and root growth of A. fatua seedlings. Only original culture filtrates of T. reesei exhibited significant effects, while the effect of filtrates of T. viride was insignificant against shoot and root growth of the target weed species. Generally, original concentrations of culture filtrates of all Trichoderma spp., except...
Tipo: Journal article
Palavras-chave: Alternative herbicides; Fungal metabolites.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200004

Alternative plants hosts of legume aphids and predators in the province of León, Spain
Provedor de dados: 118
Autores: Bertolaccini,Isabel; Núñez-Pérez,Etelvina; Tizado,Emilio Jorge.
The study was done during the spring, summer and fall of 1998 and 1999. Samples were taken at random from legume crops and spontaneous plants adjacent to them in the province of León (Spain). Observations were made on the following crops: Medicago sativa, Phaseolus vulgaris, Pisum sativum, Cicer arietinum, Trifolium repens, Vicia fava, Trifolium pratense, Vicia ervilia, Lathyrus cicera, Lathyrus sativus, Trigonella foenum-graecum, Lupinus albus, Lupinus angustifolius and Lens esculenta. Twenty three families of spontaneous plants were observed. The aphid species and their population densities on the spontaneous plants and crop plants were recorded, as was the presence of members of the families Coccinellidae, Syrphidae and Chrysopidae. The plant families...
Tipo: Journal article
Palavras-chave: Biodiversity; Chrysopidae; Coccinellidae; Fabaceae; Spontaneous plants; Syrphidae.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000200009

Altitudinal vegetation belts in the high-Andes of central Chile (33°S)
Provedor de dados: 97
Autores: Cavieres,Lohengrin A.; Peñaloza,Alejandro; Kalin Arroyo,Mary.
The limits of alpine vegetation belts have been established mainly based on physiognomic criteria. However, a more objective approach for fixing limits of vegetation belts are methods based on species composition and relative abundance of each species. While these methods are more time consuming, they are more detailed and permit the detection of physical factors affecting the limits of vegetation belts. In this paper we: 1) describe the altitudinal changes of vegetation above timberline, 2) compare vegetation belts defined with physiognomy and two floristic methods (a qualitative one based on altitudinal changes in species composition, and a quantitative one based on changes in dominant species); and 3) detect some environmental factors responsible for...
Tipo: Journal article
Palavras-chave: Altitudinal vegetation belts; Alpine vegetation; Andes; Central Chile; Cluster analysis.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000200008

Altitudinal zonation among lizards of the genus Liolaemus: questions answered and unanswered questions
Provedor de dados: 97
Autores: CAROTHERS,JOHN H.; JAKSIC,FABIÁN M.; MARQUET,PABLO A.
We review factors influencing Liolaemus distributions in the central Chilean Andes and suggest areas of future research. Our previous studies reveal that lizard parasites (ectoparasitic mites and ticks, and the endoparasite Plasmodium) do not set Liolaemus altitudinal limits. Thermal tolerances do not appear to limit altitudinal distributions, although cold ambient temperatures dictate that only live-bearing species can occur above 2,400 m elevation. Three Liolaemus species specialize on elevationally restricted microhabitats. Liolaemus tenuis is found exclusively in or at the base of trees, which are typically below 1,800 m. Liolaemus leopardinus specializes on large rocky outcrops found at high altitudes. Liolaemus monticola uses smaller rocks: oviparity...
Tipo: Journal article
Palavras-chave: Altitudinal gradient; Central Chile; Species distribution; Thermal biology; Parasite load; Microhabitat preference; Interspecific competition.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200008

Altura del Proceso Condilar en Pacientes con Diferentes Clases Esqueletales que Requieren Tratamiento de Ortodoncia
Provedor de dados: 77
Autores: Fuentes,Ramón; Silva,Héctor; Sandoval,Paulo; Cuevas,Felipe; Rodríguez,Manuel.
Los trastornos temporomandibulares (TTM) son prevalentes en la población, siendo su etiología multifactorial. Los factores etiológicos pueden agruparse en estructurales, funcionales y psicosociales. Los estudios demuestran que el 75% de la población presentan signos y 33% síntomas de TTM.Los factores estructurales, como las asimetrías de los componentes de la articulación temporomandibular, juegan un rol importante. La asimetría condilar se ha estudiado en diferentes patrones esqueletales. Se evaluaron 331 radiografías panorámicas y telerradiografías de sujetos de edades entre 8 a 18 años. Se evaluó el ángulo ANB y la altura del proceso condilar mediante el método de Habets et al. (1988). De acuerdo a la medición de la ángulo ANB, las clases esqueletales...
Tipo: Journal article
Palavras-chave: Articulación temporomandibular; Asimetrías; Proceso condilar.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400033

Aluminium tolerance in the tropical leguminous N2-fixing shrub Acaciella angustissima (Mill.) Britton &amp;amp; Rose inoculated with Sinorhizobium mexicanum
Provedor de dados: 73
Autores: RINCÓN-ROSALES,REINER; RUÍZ-VALDIVIEZO,VÍCTOR M; MONTES-MOLINA,JOAQUÍN A; GUTIÉRREZ-MICELI,FEDERICO A; DENDOOVEN,LUC.
The tropical legume Acaciella angustissima inoculated with or without Sinorhizobium mexicanum ITTG R7T strain was cultivated in an aluminium (Al) spiked soil to study its tolerance towards this metal. Seedlings of A. angustissima were grown in soil with 0, 2, 4 or 6 mg Al kg-1. The effect of Al and inoculation on growth, nodulation, and nitrogen and tannins content in the plants was monitored. Height and total and dry root weight of plantlets decreased significantly when soil was spiked with Al, but increased when inoculated. Al decreased the number of nodules. Inoculum increased total N and tannin content of the plantlets. It was found that Al reduced the growth of the tropical leguminous N2-fixing shrub A. angustissima, while inoculation with S....
Tipo: Journal article
Palavras-chave: Aluminium tolerance; Plant growth; Nodulation; Nitrogen and tannins content; Sinorhizobium mexicanum ITTG R7T; Soil.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200009

Alveolar Antral Artery
Provedor de dados: 77
Autores: Alves,Nilton.
Tipo: Journal article
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300001

Alveolar Ridge Conservation by Early Bone Formation After Tooth Extraction in Rabbits: A Histomorphological Study
Provedor de dados: 77
Autores: Cantín,Mario; Olate,Sergio; Fuentes,Ramón; Vásquez,Bélgica.
Alveolar ridge volume loss is an irreversible process. To prevent this physiological event, which typically result in significant local anatomical changes in both the horizontal and the vertical dimension, some strategies are indicated to minimize the loss of ridge volume that typically follows tooth extraction. The purpose of this study was to evaluate if three different bone grafts could promote new bone formation in the alveolar socket following tooth extraction for the alveolar ridge conservation. First mandibular molars of male adults rabbits were extracted and the extraction sockets were randomly treated with three different bone grafts, one xenograft and two alloplastic grafts, and a group that received no treatment (blood clot). The extraction...
Tipo: Journal article
Palavras-chave: Tooth Socket; Bone grafting; Alveolar bone loss; Alveolar ridges preservation.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100058

Ambar - INIA, nuevo cultivar de arroz de grano corto y muy bajo contenido de amilosa
Provedor de dados: 113
Autores: Alvarado A,José Roberto; Hernaiz L,Santiago.
Ambar-INIA is the first glutinous rice (Oryza sativa L.) cultivar released in Chile, with low amylose content (5%). Its was originated from germplasm donated by the Rice Millers Association to the Rice Breeding Program, of the National Agriculture Research Institute, Quilamapu Regional Research Center. It is a variety with short, round and opaque grain, a length/width ratio of 1.7; a semi-dwarf plant with erect leaves, later than the varieties currently in use. It has good industrial quality, low gelatinization temperature and good productivity when crop management is good.
Tipo: Journal article
Palavras-chave: Arroz; Amilosa.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100012

AMBITO DE HOGAR DE LIOLAEMUS MELANOPS BURMEISTER, 1888 (Squamata: Liolaemini) EN EL CENTRO DE CHUBUT, ARGENTINA
Provedor de dados: 72
Autores: Frutos,Nicolás; Camporro,Leonardo A; Avila,Luciano J.
Liolaemus melanops es un lagarto de mediano tamaño (hasta 90 mm LHC), que habita zonas arenosas bajas y dunas costeras en las provincias argentinas de Río Negro y Chubut. En este estudio se analizó el ámbito de hogar de una población de L. melanops en el centro de Chubut, durante el período febrero a mayo de 2005. En una cuadrícula de 100 x 100 m, todos los individuos observados fueron capturados, sexados, medidos, marcados y liberados en el mismo sitio. Mediante transectas de rumbo fijo, realizadas a intervalos regulares entre las 8:00 y las 19:00 h, fue registrada la posición de todos los individuos observados. El ámbito de hogar de cada ejemplar fue calculado utilizando el método del polígono convexo mínimo. El área promedio para los machos no fue...
Tipo: Journal article
Palavras-chave: Liolaemus; Patagonia; Polígono Convexo Mínimo; Liolaemini.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200002

Amebic Liver Abscess in Rat: Morphological Evidence of Innate Immune Modulation by the Sympathetic Nervous System
Provedor de dados: 77
Autores: Muñoz-Ortega,Martín Humberto; Cervantes-García,Daniel; Quintanar-Stephano,Andrés; Campos-Esparza,María del Rosario; García-Lorenzana,Mario; Campos-Rodríguez,R; Rodríguez,M. G; Ventura-Juárez,Javier.
All organs of the immune system are innervated and almost all neurotransmitter receptors are present on immune cells. We studied the effects of sympathetic innervation in the development of amebic liver abscess (ALA) in rats. Our results showed that lack of sympathetic innervation promote a decrease in size of ALA. We found scarce amoebas, increased the number of neutrophils and a few collagen fibers surrounding the abscess, meanwhile in control group, we observed abscesses areas with typical necrosis including trophozoites and neutrophils. Macrophages were differentially distributed surrounding abscess area in control and vehicle groups, but equally located in and outside of the abscesses in sympathectomized rat. No significant differences were observed...
Tipo: Journal article
Palavras-chave: Sympathectomy; Rat; E. histolytica; Amebic liver abscess.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100034

Ameliorative Effect of Propolis Against Hepatorenal Alterations Induced by Methotrexate: Morphohistopathological Study
Provedor de dados: 77
Autores: Almansour,Mansour I; Jarrar,Yazun B; Aloyaidy,Khalid A; Jarrar,Bashir M.
Methotrexate (MTX) is widely used in the treatment of some forms of cancer but having severe side effects. The present work aimed to investigate the protective role of propolis treatment against alterations induced by MTX on the hepatic and renal tissues. Rabbits were exposed to MTX (0.25 mg/kg), with or without propolis (50 mg/kg) while hepatic and renal biopsies were examined for histological and histochemical abnormalities. Methotrexate induced hydropic degeneration, pyknosis, sinusoidal dilatation and bile duct hyperplasia in the liver together with renal tubular degeneration, glomerular shrinkage and hyaline droplet precipitation. While propolis partially ameliorated some of the morphometric and biochemical alterations, none of the hepatic alterations...
Tipo: Journal article
Palavras-chave: Histological alterations Kidney; Liver Methotrexate toxicity Propolis.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200059

Amniotic fluid exerts a neurotrophic influence on fetal neurodevelopment via the ERK/GSK-3 pathway
Provedor de dados: 48
Autores: Jang,Yongwoo; Kim,Eun-Kyung; Shim,Won-Sik; Song,Ki-Min; Kim,Sung Min.
BACKGROUND: The fetus is surrounded by the amniotic fluid (AF) contained by the amniotic sac of the pregnant female. The AF is directly conveyed to the fetus during pregnancy. Although AF has recently been reported as an untapped resource containing various substances, it remains unclear whether the AF could influence fetal neurodevelopment. RESULTS: We used AF that was extracted from embryos at 16 days in pregnant SD rat and exposed the AF to the neural cells derived from the embryos of same rat. We found that the treatment of AF to cortical neurons increased the phosphorylation in ERK1/2 that is necessary for fetal neurodevelopment, which was inhibited by the treatment of MEK inhibitors. Moreover, we found the subsequent inhibition of glycogen synthase...
Tipo: Journal article
Palavras-chave: Amniotic fluid; Extracellular signal-regulated kinase (ERK); Glycogen synthase kinase-3 (GSK-3); Neural clustering; Neurosphere; Fetal development.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100044

Ampliaciones de una Mediateca Digital de Muestras de Laboratorio Histopatológico
Provedor de dados: 77
Autores: Ávila,Rodolfo Esteban; Alemany,Laura Alonso I; Samar,María Elena; Buzzetti,Luisa Beatriz; Juri,Gustavo; Juri,Hugo Oscar.
El objetivo general de acción de este proyecto es ampliar una mediateca digital consistente en imágenes de muestras histopatológicas obtenidas en la 2da. Cátedra de Biología Celular, Histología y Embriología de la Facultad de Ciencias Medicas Universidad Nacional de Córdoba, Argentina. Se proponen tres líneas de trabajo principales: 1- integración de imágenes y documentos científicos (abstract de artículos) mediante el uso de términos ontológicos, 2- articulación del listado de imágenes y documentos científicos con herramientas de acceso a la información multimedia (imágenes y texto), 3- incorporación de una traducción simi-automática ingles-español usando herramientas libres de traducción automática de lengua origen castellano a lengua de origen ingles....
Tipo: Journal article
Palavras-chave: Mediateca digital; Laboratorio; Muestras; Histopatología.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300034

Amplification of genome-integrated BeYDV replicons by transient expression of Rep in Arabidopsis thaliana
Provedor de dados: 69
Autores: Moon,Yong-Sun; Hefferon,Kathleen L.
Bean yellow dwarf geminivirus (BeYDV) has been used as a potential vector to improve foreign gene expression, specifically, to achieve higher yields of vaccine proteins in plants. Previously, we have shown that when the BeYDV replication initiator protein Rep was provided in trans, replication and gene expression of GUS were enhanced enormously from a BeYDV expression vector in a transient assay system. In this paper, transgenic lines of Arabidopsis (cv. Columbia) were generated harboring the BeYDV cis-acting elements required for replication. Constructs encoding BeYDV Rep or intronless Rep open reading frames (ORFs) were transiently introduced into transgenic plants via Agrobacterium-mediated infiltration in order to examine the relative levels of...
Tipo: Journal article
Palavras-chave: Agrobacterium-mediated expression; BeYDV-based vector; Gene amplification; GUS expression; Rep expression; Transgenic Arabidopsis.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400001

Amplification of tlh gene in other Vibrionaceae specie by specie-specific multiplex PCR of Vibrio parahaemolyticus
Provedor de dados: 69
Autores: Yáñez,Romina; Bastías,Roberto; Higuera,Gastón; Salgado,Oscar; Katharios,Pantelis; Romero,Jaime; Espejo,Romilio; García,Katherine.
Background The surveillance of Vibrio parahaemolyticus in the Chilean coast has been mainly performed by multiplex PCR amplification of three different hemolysin genes, which are specie-specific virulence factors. These genes are also employed in the determination of V. parahaemolyticus pathogenic load in seafood and for characterization of pathogenic strains associated to diarrhea cases in human. During environmental surveillance that we performed every summer, we occasionally observed a thermolabile hemolysin (tlh) PCR product of a slightly smaller size than expected, which was coincident with low loads of V. parahaemolyticus in the environment. In order to understand this observation, we probed the specificity of tlh primers for the detection of V....
Tipo: Journal article
Palavras-chave: Hemolysin; Multiplex PCR; Pathogen surveillance; Virulence factor; Vibrio parahaemolyticus.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600012

Amyloid-ß-peptide reduces copper(II) to copper(I) independent of its aggregation state
Provedor de dados: 48
Autores: OPAZO,CARLOS; RUIZ,FRANCISCA H; INESTROSA,NIBALDO C.
Alzheimer’s disease (AD) is characterized by the deposition of amyloid b-peptide (Aß) and neuronal degeneration in brain regions involved in learning and memory. One of the leading etiologic hypotheses regarding AD is the involvement of free radical-mediated oxidative stress in neuronal degeneration. Recent evidence suggests that metals concentrated in amyloid deposits may contribute to the oxidative insults observed in AD-affected brains. We hypothesized that Aß peptide in the presence of copper enhances its neurotoxicity generating free radicals via copper reduction. In the present study, we have examined the effect of the aggregation state of amyloid-ß-peptide on copper reduction. In independent experiments we measured the copper-reducing ability of...
Tipo: Journal article
Palavras-chave: Aß peptide; Amyloid fibrils; Copper reduction; Oxidative damage; Alzheimer’s Disease.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200012

An alternative pathway for plant in vitro regeneration of chinaberry -tree Melia azedarach L. derived from the induction of somatic embryogenesis
Provedor de dados: 69
Autores: Sharry,Sandra; Cabrera Ponce,José Luis; Herrera Estrella,Luis; Rangel Cano,Rosa María; Lede,Silvia; Abedini,Walter.
A highly efficient somatic embryogenesis system and subsequent plant regeneration of chinaberry (Melia azedarach L.) was developed. Plants were regenerated from indirect somatic embryogenesis induction. Novel features of this improved protocol, include: a) Embryogenic callus induction with no addition of 2, 4-D in the culture media; b) Somatic embryos differentiation was achieved by using high concentration of cytokinins (BAP 10 mg/L) and adenine; c) 100% conversion of somatic embryos to plants was practically obtained and 100% of plants survived under greenhouse conditions; d) Addition of putrescine improved somatic embryos germination. The amount of somatic embryos produced by the pathway of indirect somatic embryogenesis was 447 per gram of fresh weight...
Tipo: Journal article
Palavras-chave: Callus induction; Clonal forestry; Embryos conversion; Micropropagation; Persian lilac; Somatic embryos.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300003

AN ALTERNATIVE PROPOSAL: ACOUSTIC TECHNIQUES TO ASSES DETECTION AND MONITORING OF TOXIC ALGAL BLOOMS
Provedor de dados: 72
Autores: Blanc,Silvia; Mosto,Patricia; de Milou,Marta E; Benítez,Carlos.
An alternative methodology consisting in the application of acoustic techniques to asses detection and monitoring of toxic algal blooms is presented here. Successive steps in this direction led to already reported results [Blanc et al., 2000] achieved under the frame of a multidisciplinary research programme conducted in the Argentinean Naval Service of Research and Development. First efforts were focused in the examination of the acoustical scattering behaviour of single-species cultures of Skeletonema costatum. For this purpose a pulse-echo electronic equipment was developed, including home-made piezoelectric transducers with an operating frequency centred at 2.6 MHz. A slight modified Johnson's fluid-sphere model was used. Numerical Abundance estimates...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200009

An analysis of factors affecting the adoption of economic and productive data recording methods of Chilean farmers
Provedor de dados: 118
Autores: Engler,Alejandra; Toledo,Roger.
Integration of the Chilean domestic economy into international markets has created the need to incorporate more technology, information, and management tools and to generate better entrepreneurial skills at the farm level. These changes require the development of strategic capabilities and farmer changes in attitude. The goal for farmers is to be more prepared for the decision-making process and to have adequate evaluation and control systems to face the complexity of the farm business. The literature suggests that using management tools positively correlates with profits and concludes that management skills are positively related to farmers' well-being. Survey information on 211 farmers from central and southern Chile was used to estímate a probit model...
Tipo: Journal article
Palavras-chave: Record-keeping; Management skills; Probability models.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200010

An analysis of the physical and germination parameters of the sweet Chestnut (Castanea sativa)
Provedor de dados: 118
Autores: Benedetti,Susana; González,Marta; García,Edison; Quiroz,Iván.
This study analyzed the physical characteristics, number of seeds per kilogram, seed weight, germination characteristics, germination percentage, germination energy, germination period and the germination vigor of sweet chestnut seeds from two forest plantations in the Los Ríos region of Chile. No significant differences were found in any of the characteristics related to the collection zone. Following the international classification systems for seeds of this species, the values of the physical characteristics allow us to classify these seeds as a small caliber or "chestnut". The values of the germination characteristics (&gt;80%) demonstrate a good germination for chestnut seeds of forest origin.
Tipo: Journal article
Palavras-chave: Energy period; Germination energy; Germination percentage; Germination vigor; Number of seeds per kilogram; Seed weight.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100015

An Anatomical Study of the Arterial Supply to the Soft Palate
Provedor de dados: 77
Autores: Maistry,T; Lazarus,L; Partab,P; Satyapal,K. S.
This study provides a detailed description of the arteries supplying the soft palate via: (i) ascending palatine; (ii) tonsillar; (iii) ascending pharyngeal; and (iv) lesser palatine arteries. Detailed dissections were performed on each side of thirty fetal and twenty adult head and neck specimens (n=100). This investigation documents the arteries terminating at the respective parts (superior, middle and inferior) of the soft palate and demonstrated that the majority of arteries terminated at the superior (83%) and middle (63%) parts, whereas the inferior part (34%) was documented to receive the poorest arterial supply. The present study recognized anastomotic connections in 6% of fetal specimens i.e. (i) between the ascending palatine and lesser palatine...
Tipo: Journal article
Palavras-chave: Soft palate; Arterial supply; Territory; Anastomosis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300014

An Anatomical Study of Variations of Sacral Hiatus in Sacra of North Indian Origin and Its Clinical Significance
Provedor de dados: 77
Autores: Seema,; Singh,M; Mahajan,A.
Sacrum is formed by the fusion of five sacral vertebrae and forms the lower part of vertebral column. The opening present at the lower end of sacral canal is known as sacral hiatus. Anatomical variations in morphology and morphometry of sacral hiatus are important clinically as well as surgically. 159 dry clean human Sacra were taken from Department of Anatomy, Sri Guru Ram Das Institute of Medical Sciences and Research Vallah (Amritsar). Various shapes of sacral hiatus were observed which included inverted U (42.95%), inverted V (27.51%), irregular (16.10%), dumbbell (11.40%) and bifid (2.01%). The apex of sacral hiatus was commonly found at the level of 4th sacral vertebra in 56.36%. The mean length of sacral hiatus was 22.69 mm. The mean anteroposterior...
Tipo: Journal article
Palavras-chave: Sacral Hiatus; Apex; Sacral canal; Caudal epidural block.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100017

An Anomalous Left External Jugular Vein Draining into Right Subclavian Vein: A Case Report
Provedor de dados: 77
Autores: Rajanigandha,V; Rajalakshmi,R; Ranade,A. V; Pai,M. M; Prabhu,L. V; Ashwin,K; Jiji,P. J.
Knowledge of the varying drainage patterns of superficial veins of head &amp;amp; neck, in particular, jugular veins are not only important for anatomists but also for the surgeons operating at this level and to clinicians in general. The variations are important for interventional radiologists too who perform transjugular procedures, such as port implantations and the transjugular intrahepatic portosystemic shunt or selective venous samplings. Results of recent studies report that the superficial veins, especially the external jugular vein (EJV), is been increasingly utilized for cannulation to conduct diagnostic and therapeutic procedures. We report a very unusual presentation of external jugular vein on left side of an embalmed male cadáver....
Tipo: Journal article
Palavras-chave: External jugular vein; Variations; Jugular venous system.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400018

An Anomalous Pattern of Superficial Branch of Radial Nerve: A Cadaveric Case Report
Provedor de dados: 77
Autores: Nurul Huda,Mohd Nor; San,Aye Aye; Fauziah,Othman.
In the present case study, there is an anomalous pattern of superficial branch of radial nerve (SBRN) that can be recognized as an anatomical variant of the left upper limb of a 60 years old donated embalmed male cadaver in the Department of Human Anatomy, Universiti Putra Malaysia, in which the superficial branch of radial nerve supplies the extensor carpi radialis longus and extensor carpi radialis brevis muscle. The superficial branch of radial nerve gave off branch to supply the proximal fusion part of extensor carpi radialis longus and extensor carpi radialis brevis muscles immediately after bifurcation of the radial nerve into the superficial branch of radial nerve and deep branch of radial nerve. This variation is very important to the surgeon as...
Tipo: Journal article
Palavras-chave: Anatomical variant; Superficial branch of radial nerve; Extensor carpi radialis longus; Extensor carpi radialis brevis.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100005

An Anthropometry Study of the Shoulder Region in a Chinese Population and its Correlation with Shoulder Disease
Provedor de dados: 77
Autores: Yu,Ming-Yang; Zhang,Wei; Zhang,De-Bao; Zhang,Xiao-Dong; Gu,Gui-Shan.
Purpose: There is a paucity of data which reflected the relationship between morphology and incidence of shoulder disorders with respect to the ethnic Chinese population. We used anteroposterior radiographs to measure the Acromion Index (AI) and Acromioglenoid Angle (AA) of Chinese patients. The baseline was defined as the line that connected the superior and inferior osseous margins of the glenoid cavity. In order to calculate the AI, the distance from the baseline to the lateral margin of the acromion was measured and then divided by the distance from the baseline to the lateral aspect of the humeral head. The AA was defined as the angle formed by the intersecting line drawn tangent to the sclerotic line of the acromion undersurface and the baseline...
Tipo: Journal article
Palavras-chave: Acromioglenoid angle; Acromion index; Chinese population; Rotator cuff Injuries; Acromial Tilt.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200020

An approach to the study of the fungal deterioration of a classical art material: Mastic varnish
Provedor de dados: 69
Autores: Romero-Noguera,Julio; López-Miras,María del Mar; Martín-Sánchez,Inés; Ramos-López,José Miguel; Bolívar-Galiano,Fernando.
Mastic, one of the best natural varnishes, is frequently used as protective and finishing layer or as component of oleo-resinous media in paintings, both in the past and currently. However, this resin is affected by complex deterioration processes which can change its characteristics and thus the visual aspect of works of art. The alteration processes caused by radiation have been widely studied, but there is a lack of information on the biodeterioration of this natural product. In this paper, fungi from collections as well as from oil paintings of the Fine Arts Museum of Granada (Spain) were inoculated onto slides covered with mastic. The samples, after an incubation period of 15 days, were analysed by gas chromatography-mass spectrometry (GC-MS) to...
Tipo: Journal article
Palavras-chave: Biodeterioration; Fungi; GC-MS; Mastic.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600001

An assessment of volume-ratio functions for Eucalyptus globulus and E. nitens in Chile
Provedor de dados: 118
Autores: Gilabert,Horacio; Paci,Carlos.
Volume-ratio and total volume models for Eucalyptus nitens and E. globulus grown in southern Chile were ftted independently. The validation process considered the bias and the total error in the volume estimates, as well as the age classes close to thinning and harvesting operations. Volume estimates from the system of functions (volume and ratio) were compared to the volume estimates from a taper function (Bruce model) to estimate the volume at different top stem diameters. The results indicated that general (as opposed to local) logarithmic functions performed better in their estimation of the total volume for both species, while a unique polynomial model was the best model for the ratio estimates for both Eucalyptus species. The system of functions...
Tipo: Journal article
Palavras-chave: Eucalyptus; Models; Timber products estimates; Volume-ratio functions.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100001

An Attempt to Determine the Size of Biometric Differences in the Skull of Two Colour Variants of American Mink (Neovison vison)
Provedor de dados: 77
Autores: Baranowski,Piotr; Pezinska-Kijak,Katarzyna; Felska-Blaszczyk,Lidia; Zuk,Krzysztof; Nowak,Piotr; Kosecka,Joanna; Oczeretko,Kamila; Chukwu,Peter; Mazur,Pawel.
This study aimed at answering the question whether production of new colour variants of American mink in mink farms using mutations may entail changes in skull morphology and relationships between the bone elements building it. Analyses were made on the skulls of 56 eight-month-old males and females of two American mink colour variants (standard Brown and mutant Sapphire) from the same farm. Mean values, standard deviations and coefficients of variation were determined for carcass weight, cranial and mandibular weights and 7 dorsal surface, 8 lateral surface and 11 basal surface traits of the skull. The values of 24 cranial and mandibular indices and the values of sexual size dimorphism (SSD), i.e. a coefficient describing differences between sexes, were...
Tipo: Journal article
Palavras-chave: Biometry; Neovison vison; Viscerocranium; Neurocranium; Skull.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300024

An economic valuation of a biotechnology R&amp;D project in a developing economy
Provedor de dados: 69
Autores: Erbas,Bahar Celikkol; Memis,Selin Arslanhan.
Background: Biotechnology complements technological developments in main sectors of economies, such as health, energy, and agriculture, and thus contributes to economic development. It provides solutions to the problems that are frequently faced in developing economies, such as resource constraints, lower productivity and environmental concerns. In order to benefit from biotechnology, its associated markets need to develop and function well to support the developments and transactions of intangible assets, such as technology transfers, license agreements and research and development joint ventures. Economic valuation of the intangible assets is necessary for the development and functioning of these markets. It provides better understanding of value...
Tipo: Journal article
Palavras-chave: Biotechnology sector; Developing economies; Real options; R&amp;D project valuation; Turkey.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300001

An ecophysiographic approach for Araucaria araucana regeneration management
Provedor de dados: 118
Autores: Drake,Fernando; Molina,Juan Ramón; Herrera,Miguel Ángel.
Chilean temperate forests are dominated by Nothofagus and Araucaria araucana species. Despite A. araucana not being at imminent risk of extinction, its cultural value and the associated environmental services and landscape goods have an important role for the conservation of this native forest. In some areas, the future conservation of A. araucana is a cause of great concern given its management prohibition and regeneration limitation due to slow growth, canopy tree competition and dense understory. The above characteristics make this species most susceptible to some disturbances, such as livestock, wildlife and human pressures. Therefore, sustainable management of A. araucana forests requires the assessment of its regeneration condition. The objective of...
Tipo: Journal article
Palavras-chave: Maxent model; Nothofagus species; Seedling establishment; Seedling tree.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100013

An edaphological, morphological and climatic classification of freshwater forested wetlands from Chile
Provedor de dados: 72
Autores: CORREA-ARANEDA,FRANCISCO; GUEVARA-MORA,MEYER; DÍAZ,MARÍA ELISA; FIGUEROA,RICARDO.
Wetlands of the same kind can present considerable difference in relation to a series of environmental variables that influence on the physicochemical properties and on the biological communities sustained, natural variability scarcely considered in comparative studies. The aim of this work was to provide a first approach to the edaphological, morphological and climatic classification of the forested wetlands from central Chile, unique environments for the conservation of an interesting floral and faunal diversity. 18 wetlands were classified in the Araucanía Region, by means of the B classification procedure by the European Union Water Framework Directive. 21 variables at basin scale were used. Four ecotypes were obtained, which were characterized mainly...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100002

An Electron Microscopic Study of the Antifertility Potential of Rosemary (Rosmarinus officinalis L.) in Male Albino Rats
Provedor de dados: 77
Autores: El-Din,Rania A. Salah; El-Shahat,Abd El-Rahman; Elmansy,Rasha Ahmed.
The present work was aimed at studying the antifertility potential of the commonly used herb, rosemary in the male albino rats using electron microscopy as the method of investigation. Ethanolic extract of the rosmary prepared and administered orally in two different doses for a period of three months to the animals. At the end of the experiment animals were sacrificed and testes removed. Sections for the electrone microscopy prepared and changes were observed. The present results showed evident microscopic changes in the testis of the animals received higher dose of the drug. Most of the seminiferous tubules were compressed, having irregular basement membrane and devoid of any spermatogenic cells. The present work revealed a clear morphological evidence...
Tipo: Journal article
Palavras-chave: Antifertility potential; Rosemary; Rosmarinus officinalis L; Electron microscopy; Male albino rats.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200051

An "enactive" approach to integrative and comparative biology: Thoughts on the table
Provedor de dados: 48
Autores: PALACIOS,ADRIAN G.; BOZINOVIC,FRANCISCO.
We discuss the concept of Enaction as originally proposed by Varela. We attempt to exemplify through two specific topics, sensory ecology and behavior, as well as physiological and behavioral ecology, on which the enactive approach is based. We argue that sensory physiology allows us to explore the biological and cognitive meaning of animal 'private' sensory channels, beyond the scope of our own sensory capacity. Furthermore, after analyzing the interplay between factors that may impose limits upon an animal's use of time and energy, we call for a program of research in integrative and comparative biology that simultaneously considers evolutionary ecology (including physiological and behavioral ecology) and neurobiology (including cognitive mechanisms as...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000100008

An evaluation of copper biosorption by a brown seaweed under optimized conditions
Provedor de dados: 69
Autores: Antunes,Wallace M.; Luna,Aderval S; Henriques,Cristiane A; da Costa,Antonio Carlos A.
A basic investigation into the removal of copper ions from aqueous solutions by Sargassum sp. was conducted in batch conditions. The influence of different experimental parameters such as initial pH, shaking rate, sorption time, temperature, equilibrium conditions and initial concentrations of copper ions on copper uptake was evaluated. Results indicated that for shaking rates higher than 100 rpm no significant changes in copper accumulation were observed, as well as for pH values between 3.0 and 5.0. No marked effect on the biosorption of copper was detected for temperatures between 298 and 328K. The Langmuir model better represented the sorption process, in comparison to the model of Freundlich. The process followed a second-order kinetics and its...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300003

An evaluation of methods for modelling distribution of Patagonian insects
Provedor de dados: 97
Autores: TOGNELLI,MARCELO F; ROIG-JUÑENT,SERGIO A; MARVALDI,ADRIANA E; FLORES,GUSTAVO E; LOBO,JORGE M.
Various studies have shown that model performance may vary depending on the species being modelled, the study área, or the number of sampled localities, and suggest that it is necessary to assess which model is better for a particular situation. Thus, in this study we evalúate the performance of different techniques for modelling the distribution of Patagonian insects. We applied eight of the most widely used modelling methods (artificial neural networks, BIOCLIM, classification and regression trees, DOMAIN, generalized additive models, GARP, generalized linear models, and Maxent) to the distribution of ten Patagonian insect species. We compared model performance with five accuracy measures. To overeóme the problem of not having reliable absence data with...
Tipo: Journal article
Palavras-chave: Expert opinión; Model evaluation; Patagonia; Pseudo-absence data; Species distribution modelling.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300003

An evaluation of orange and clear traps with pear ester to monitor codling moth (Lepidoptera: Tortricidae) in apple orchards
Provedor de dados: 118
Autores: Barros-Parada,Wilson; Knight,Alan L; Basoalto,Esteban; Fuentes-Contreras,Eduardo.
W. Barros-Parada, A.L. Knight, E. Basoalto, and E. Fuentes-Contreras. 2013. An evaluation of orange and clear traps with pear ester to monitor codling moth (Lepidoptera: Tortricidae) in apple orchards. Cien. Inv. Agr. 40(2):307-315. Studies were conducted to evaluate the use of several trap-lure combinations to improve the monitoring of codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), in apple, Malus domestica Bordk. The treatments involved the use of clear, orange, and white traps baited with one or more of the following attractants: the major sex pheromone component of the codling moth, (E, E)-8,10-dodecadien-1-ol (codlemone, PH); a primary volatile constituent of ripe pear, ethyl (E, Z)-2,4-decadienoate (pear ester, PE); and acetic acid...
Tipo: Journal article
Palavras-chave: Codlemone; Cydia pomonella; Lure; Monitoring; Pear ester; Semiochemical.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200006

An evolutionary frame of work to study physiological adaptation to high altitudes
Provedor de dados: 97
Autores: REZENDE,ENRICO L.; GOMES,FERNANDO R.; GHALAMBOR,CAMERON K.; RUSSELL,GREGORY A.; CHAPPELLl,MARK A.
How complex physiological systems evolve is one of the major questions in evolutionary physiology. For example, how traits interact at the physiological and genetic level, what are the roles of development and plasticity in Darwinian evolution, and eventually how physiological traits will evolve, remains poorly understood. In this article we summarize the current frame of work evolutionary physiologists are employing to study the evolution of physiological adaptations, as well as the role of developmental and reversible phenotypic plasticity in this context. We also highlight representative examples of how the integration of evolutionary and developmental physiology, concomitantly with the mechanistic understanding of physiological systems, can provide a...
Tipo: Journal article
Palavras-chave: Adaptation; Evolutionary processes; Natural selection; Life-history; Oxygen availability; Phenotypic plasticity.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200016

An improved system for competent cell preparation and high efficiency plasmid transformation using different Escherichia coli strains
Provedor de dados: 69
Autores: Tu,Zhiming; He,Guangyuan; Li,Kexiu X.; Chen,Mingjie J.; Chang,Junli; Chen,Ling; Yao,Qing; Liu,Dongping P.; Ye,Huan; Shi,Jiantao; Wu,Xuqian .
This paper describes an efficient bacterial transformation system that was established for the preparation of competent cells, plasmid preparation, and for the storage in bacterial stocks in our laboratory. Using this method, a number of different plasmids have been amplified for further experiments. Competent cells for bacterial transformation were prepared by the calcium chloride method with an optimum concentration of 75 mM. Three different strains of Escherichia coli that were tested are DH5&amp;#945;, TG1 and XL1 blue, and the most efficient strain being XL1 blue. The optimal optical density (OD600) range for competent cell preparation varied for each of the strains investigated, and for XL1 blue it was 0.15-0.45; for TG1 it was 0.2-0.5; and for...
Tipo: Journal article
Palavras-chave: Competent cells; E. coli; Plasmid; Storage; Transformation.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100014

An increasing of the efficiency of microbiological synthesis of 1,3-propanediol from crude glycerol by the concentration of biomass
Provedor de dados: 69
Autores: Szymanowska-Powalowska,Daria; Leja,Katarzyna.
Background 1,3-Propanodiol (1,3-PD), is used in the production of polytrimethylene terephthalate (PTT), an aromatic polyester that exhibits high elastic recoveries. It is also employed as a supplement with low solidification properties, a solvent and a lubricant in the formof propylene glycol. 1,3-PD is effectively synthesized by a microbiological way from crude glycerol. The main problem of this technology is using a high concentration of glycerol, which is a limiting factor for bacteria cells growth (especially in batch fermentation). Results In this work, the influence of different glycerol concentration in batch fermentation on Clostridium butyricum DSP1 metabolism was investigated. The biomass was concentrated for two times with the use of membrane...
Tipo: Journal article
Palavras-chave: C. butyricum; HSP protein; Microfiltration.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000200003

An inertizing and cooling process for grapes cryomaceration
Provedor de dados: 69
Autores: Carillo,Maria; Formato,Andrea; Fabiani,Andrea; Scaglione,Giampiero; Pucillo,Giovanni Pio.
Background: With this research an inertizing and cooling process for grapes cryomaceration has been set up. The process in question has been performed by an innovative plant that cooled the grapes rapidly in about 8 sec until they reached the set cryo-maceration temperature, using direct injection of liquid CO2. It works with a grape flow of approximately 2-3 tons/h, with a maximum thermal gradient of 20 K between the grape inlet and outlet temperature. For this plant a vibrating device was set up that allowed that only one grape cluster layer to be formed on the ribbon conveyor after the grapes had been put into the feedbox. A numerical model was set up for the cooling tunnel, and numerical simulations were performed to investigate the operative...
Tipo: Journal article
Palavras-chave: Cryogenic liquid CO2; Cryomaceration process; Inertizing process.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600008

AN INTERACTIVE SOFTWARE PACKAGE FOR VALIDATING SATELLITE DATA
Provedor de dados: 72
Autores: Muraleedharan,P.M.; Pankajakshan,T.
Earth observation satellite launched in the last three decades have made vital contributions to the understanding of the planet. The earth system consisting of land, oceans and atmosphere is linked together by a number of complicated processes. Potential of microwave sensors in studying the boundary layer dynamics of the ocean-atmosphere system is well documented. Technology has revolutionized the application of such sensors and several missions are planned to take off in near future for meeting specific objectives. Launching of such sensors need to be followed by an extensive validation campaign for providing accurate and reliable information to the users. A PC-based interactive system has been developed and presented here for validating satellite mounted...
Tipo: Journal article
Palavras-chave: Validation; Microwave sensor; Autocorrelation; Sea surface temperature; Wind speed; Columnar water vapor.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300018

An Interactive Tool for the Human Anatomy Laboratory
Provedor de dados: 77
Autores: Maldonado-Zimbrón,Victor E.; Elizondo-Omaña,Rodrigo E.; Cepeda,Beatriz A. De la Garza; Vilchez-Cavazoz,Félix; Castro,Oscar de la Garza; Guzmán-López,Santos.
A multimedia program has been developed at the Departament of Human Anatomy, Medicine School of Universidad Autónoma de Nuevo León. It offers an alternative to support the traditional laboratory practice and resolve, during the dissection, the most common problems that we have already identify in our students. Some features of this program are: photography's, diagrams, information about the structures, clinical correlation and tests. All this tools were integrated in a software using Macromedia Flash. The final result is a multimedia program that will be used by students during their laboratory practice. At present, we are making a study to determine the effect that is produced in the development of the students in the anatomy lab
Tipo: Journal article
Palavras-chave: Laboratory practice; Multimedia program; Dissection; Teaching anatomy.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400014

An international political economic view of the biotechnology industry
Provedor de dados: 69
Autores: Pownall,Ian Edward.
This paper uses a model developed from the international political economy (IPE) school, to address the structure of the biotechnology industry. In particular, by focusing upon four primary structural elements of the industry, knowledge, production, finance and security with key secondary considerations of biosafety, public opinion and choice of intellectual property regime, the development of biotechnology companies from developed countries fits within a triad dominated industry with specific interests towards firms from developing countries. The activities of a sample of US National Association of Securities Dealers Stock Market (NASDAQ) quoted biotechnology firms are investigated to support the model which concludes by the observation of the need to...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000200004

An Osteometric Evaluation of the Foramen Spinosum and Venosum
Provedor de dados: 77
Autores: Lazarus,L; Naidoo,N; Satyapal,K. S.
The foramen spinosum (FS) and foramen venosum (of Vesalius) (FV) are alisphenoid apertures situated within the hub of the middle cranial fossa in close proximity to foramen ovale (FO). The FS and FV provide a passage to important neurovascular structures. An accurate knowledge of the morphometric details of the FS and FV including their shape, incidence, relation to other foramina and/or presence of any anomalies may represent a reliable anatomical landmark during surgical explorative maneuvers. Therefore, the aim of this study was to investigate the morphologic and morphometric features of the FS and FV. The study was conducted on 100 dry human skulls (n= 200) obtained from the osteological bank at the University of KwaZulu-Natal, to produce a database...
Tipo: Journal article
Palavras-chave: Foramen spinosum; Foramen venosum; Foramen of Vesalius; Middle cranial fossa; Greater wing of sphenoid bone.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200008

An Osteometric Evaluation of the Jugular Foramen
Provedor de dados: 77
Autores: Ishwarkumar,S; Naidoo,N; Lazarus,L; Pillay,P; Satyapal,K. S.
The jugular foramina (JF) are bilateral openings situated between the lateral part of the occipital bone and the petrous part of the temporal bones in the human skull. It is a bony canal transmitting neurovascular structures from the posterior cranial fossa through the base of the skull to the carotid space. Since the JF depicts variations in shape, size, height and volume between different racial and gender groups, along with distinctive differences in laterality from its intracranial to extracranial openings, knowledge of the JF may be necessary to understand intracranial pathologies. Therefore, the purpose of this study was to evaluate the morphometric measurements of the jugular foramen. Various morphometric parameters of the JF and its relation to...
Tipo: Journal article
Palavras-chave: Jugular foramen; Morphometry; Surrounding structures.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100039

An Osteometric Evaluation of the Mandibular Condyle in a Black KwaZulu-Natal Population
Provedor de dados: 77
Autores: Ishwarkumar,S; Pillay,P; DeGama,B. Z; Satyapal,K. S.
The mandibular condyle is the rounded protuberance that articulates with the mandibular fossa to form the temporomandibular joint (TMJ). The shape of the mandibular condyle may be classified according to five basic shapes viz. flattened, convex, angled, rounded and concave. Previous research indicated that variation in the shape and size of the mandibular condyle, exists and that population-specific differences may also occur. This study aimed to document the shapes and size of the mandibular condyle and determine their relationship with regard to sex, age and race (if any). The morphometric and morphological parameters of the mandibular condyle were measured and assessed in 54 dry mandible specimens (n= 108). The Wedel et al. (1978) classification scheme...
Tipo: Journal article
Palavras-chave: Mandibular condyle; Mandibles; Osteology; Morphometry; Morphology.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300005

An Osteometric Study on Humerus
Provedor de dados: 77
Autores: Aydin Kabakci,A. D; Buyukmumcu,M; Yilmaz,M. T; Cicekcibasi,A. E; Akin,D; Cihan,E.
Humerus is the longest and thickest bone of the upper limb. As a long bone, it has two epiphysis and diaphysis. In this study, we aimed to conduct morphometric measurements belonging to human humerus. This study was conducted on 60 humerus (28 right, 32 left) in collections of Necmettin Erbakan University Meram Medicine Faculty Anatomy Laboratory. Digital calipers, osteometric board and precision scales for humerus bone measurements were used. Measurements were classified as measurements of diaphysis and proximal and distal epiphysis of humerus. Each bone weight was determined. Also nutrient foramen number and localization was determined. In this study, it was determined that mean right humerus length 30.41±1.73 mm, mean left humerus length 30.04±2.39 mm....
Tipo: Journal article
Palavras-chave: Humerus; Morphometry; Osteometry.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100036

An overview of interactions among oceanography, marine ecosystems, climatic and human disruptions along the eastern margins of the Pacific Ocean
Provedor de dados: 97
Autores: HALPIN,PATRICIA M.; STRUB,P. TED; PETERSON,WILLIAM T.; BAUMGARTNER,TIM R.
Physical processes, biotic processes and human activities all act to shape marine ecosystems. Future management of these valuable ecosystems requires an integrative approach that takes into account complicated organismal interactions, oceanographic processes that span large scales of time and space, and how anthropogenic effects interact with the natural environment. The temperate west coasts of North and South America represent a unique opportunity for comparison, as many of the same oceanographic processes, particularly upwelling, occur off both coasts. Additionally, a number of marine ecosystems in both areas have surprising parallels. Here we present an overview of the oceanographic processes that dominate the coastlines, and give examples of...
Tipo: Journal article
Palavras-chave: Eastern boundary currents; Anthropogenic effects; Marine community ecology; Fisheries; Interdecadal variability.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300002

An RT-PCR artifact in the characterization of bacterial operons
Provedor de dados: 69
Autores: Guacucano,Maritza; Levican,Gloria; S. Holmes,David; Jedlicki,Eugenia.
During the course of experiments involving RT-PCR to investigate the co-transcription of the pet and res operons of the bacterium Acidithiobacillus ferrooxidans we observed that the mRNA of certain gene pairs can be amplified by RT-PCR in the absence of added RT-primer. We provide experimental evidence that eliminates, as explanations for the observed results, the possible global contamination of the RNA preparation by genomic DNA or by contaminating single stranded DNA or RNA fragments. We suggest that the results can be explained by self-priming of the RNA perhaps as a result of secondary structure configurations that provide a suitable 3’-terminus to prime the reverse transcriptase. This type of artifact can be recognized by carrying out a control in...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000300005

An Unusual Anatomic Variation of the Jugular Foramen with Doubled Posterior Condylar Canal
Provedor de dados: 77
Autores: Kapakin,Samet.
A case of unusual anatomical variation of the jugular foramen (JF) with doubled posterior condylar canal (PCC) is reported. According to the presence of bridging, the JF can be defined as Type I (one septation, two compartments) on the right side and Type IV (three septations, four compartments) on the left side. The dome of the jugular fossa is present on the right, absent on the left. The jugular foramen shows a canal-like structure with an external and an internal opening. The lengths of the longest and widest axes of the JFs are measured as 21.93 x 16.56 mm on the right and 16.75 x 15.14 mm on the left side. The right JF is larger. The PCC is doubled on the right side and there is only one on the left side. It is essential not only to know compartments...
Tipo: Journal article
Palavras-chave: Jugular foramen; Condylar canal; Anatomic variation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400019

An Unusual Anatomical Variation of the Levator Scapulae Muscle
Provedor de dados: 77
Autores: Varjão Lima,Gabriel; Cabral,Richard Halti; Andrade,Danilo Leite; Lacerda,Nayara Soares de Oliveira; Araújo,Vital Fernandes; Masuko,Telma Sumie.
Clinical and surgical importance of the levator scapulae muscle (LSM) requires a better knowledge of its anatomic variation mainly because of the possibility of new findings related to the embryologic development. This article reports a case of a left-sided LSM with atypical attachments in a 58-year-old preserved Caucasian female body. The muscle presented a bifurcation at its midpoint downward path. Its medial band attached to the anterior aspect of the left rhomboideus major muscle while its left band was fixed in the superior angle of the scapula after releasing a muscle expansion to the serratus anterior muscle. The morphometric analysis revealed LSM maximal width of 3.6 cm, bifurcation point located 6.6 cm apart from the C1 vertebral attachment;...
Tipo: Journal article
Palavras-chave: Levator scapulae muscle; Anatomical variation; Macroscopic anatomy; Clinical anatomy; Muscular system.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300016

An Unusual Termination of Seven Veins in the Jugulo-Subclavian Junction
Provedor de dados: 77
Autores: Panagouli,Eleni; Tsaraklis,Athanasios; Gazouli,Ioanna; Venieratos,Dionyssios.
During anatomical dissection of a female Caucasian cadaver in our department, we observed an unusual termination of seven veins at the jugulo-subclavian junction. Normally, the jugulo-subclavian junction is formed by the union of the internal jugular vein and the subclavian vein, and gives rise to the brachionocephalic vein. In our case, except from these two, five additional veins, namely the cephalic vein, the transverse cervical vein, the external jugular vein, the anterior jugular vein, and the vertebral vein, were also joined at the level of the jugulo-subclavian junction, in order to form the brachionocephalic vein. Such a variation has not yet been reported in the literature.
Tipo: Journal article
Palavras-chave: Subclavian vein; Brachiocephalic vein; Cephalic vein; Interior jugular vein; External jugular vein.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400046

An update on genetically modified crops
Provedor de dados: 118
Autores: Schwember,Andrés R.
A. R. Schwember. 2008. An update on genetically modified crops. Cien. Inv. Agr. 35(3):231-250. Genetically modified (GM) crops were introduced in the mid 1990s and two principal transgenic technologies currently domínate the market, herbicide-tolerant (HT) crops and insect-resistant crops (Bacillus thuringiensis (Bt) crops). HT crops have simplified weed management practices, reduced crop production costs, and have had positive effects on the environment. However, there are concerns about the potential development of weeds resistant to glyphosate, the main herbicide employed with HT crops. A second major worry associated with the use of HT crops is the potential introgression of genes from GM crops into wild relatives (i.e. gene flow) and its potential...
Tipo: Journal article
Palavras-chave: Bt crops; Gene flow; Genetically modified crops; Glyphosate; Golden Rice; Herbicide-tolerant crops; Transgenic crops.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300001

Anaerobic membrane bioreactors: Are membranes really necessary?
Provedor de dados: 69
Autores: Jeison,David; Díaz,Israel; van Lier,Jules B.
Membranes themselves represent a significant cost for the full scale application of anaerobic membrane bioreactors (AnMBR). The possibility of operating an AnMBR with a self-forming dynamic membrane generated by the substances present in the reactor liquor would translate into an important saving. A self-forming dynamic membrane only requires a support material over which a cake layer is formed, which determines the rejection properties of the system. The present research studies the application of self-forming dynamic membranes in AnMBRs. An AnMBR was operated under thermophilic and mesophilic conditions, using woven and non woven materials as support for the dynamic membranes. Results showed that the formation of a cake layer over the support materials...
Tipo: Journal article
Palavras-chave: Cake layer; Dynamic membrane; MBR; Woven filter.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400001

Análisis Antropométrico de la Simetría Corporal en Jugadores de Bádminton
Provedor de dados: 77
Autores: Abián,P; Abián-Vicén,J; Sampedro,J.
El objetivo del estudio fue comprobar si existen diferencias entre el lado dominante y no dominante de las medidas antropométricas en los mejores jugadores y jugadoras españoles de bádminton, así como verificar si el lado del cuerpo donde se realiza la medición puede influir en el cálculo de la composición corporal y del somatotipo. Participaron voluntariamente en el estudio 46 jugadores de bádminton de élite, 31 eran hombres (edad=21,7±4,3 años) y 15 mujeres (edad=19,1±4,4 años). Se tomaron las medidas de 6 pliegues cutáneos, 3 diámetros, 3 longitudes y 5 perímetros del lado dominante y no dominante de los sujetos. Se calculó la composición corporal y el somatotipo con los valores registrados en cada uno de los lados. No se encontraron diferencias en los...
Tipo: Journal article
Palavras-chave: Bádminton; Antropometría; Composición corporal; Somatotipo; Masa muscular.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300030

Análisis biogeográfico de la diversidad pteridofítica en Argentina y Chile continental
Provedor de dados: 97
Autores: PONCE,MÓNICA; MEHLTRETER,KLAUS; DE LA SOTA,ELÍAS R.
Las Pteridófitas de Chile continental están representadas por 116 especies nativas (43 géneros, 20 familias), y en Argentina continental por 346 (86 géneros, 27 familias). Ambos países comparten 89 especies (41 géneros, 20 familias). La menor diversidad pteridofítica y el mayor endemismo en Chile (11,2 %) que en Argentina (3,5 %) están relacionados probablemente con extinciones históricas y su actual aislamiento geoclimático. Sin embargo, se destaca que el endemismo en los helechos es cinco a seis veces menor que en Angiospermas. Los géneros con más especies en Argentina son Thelypteris (34), Asplenium (32), Cheilanthes (21), Blechnum (19) e Hymenophyllum (16). Los dos últimos también son los más diversificados en Chile (Hymenophyllum, 18 y Blechnum, 10)....
Tipo: Journal article
Palavras-chave: Pteridófitas; Biogeografía; Diversidad; Argentina.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400006

Análisis Biométrico de las Arterias Comunicante Anterior y Cerebral Anterior en el Segmento Precomunicante del Círculo Arterial Cerebral
Provedor de dados: 77
Autores: Mandiola,Eduardo; Alarcón,Eduardo; del Sol,Mariano; Olave,Enrique; Montero,C; Sanhueza,P; Oñate,Juan Carlos.
La conformación del círculo arterial cerebral tiene relevancia en la clínica neuroquirúrgica por la relación compleja que presentan las arterias que lo originan y su gran variabilidad. Debido a la alta frecuencia con que se observan aneurismas en las arteria comunicante anterior y en el segmento precomunicante (A1) de la arteria cerebral anterior se efectuó un análisis biométrico de ellas. El trabajo se realizó en 36 cerebros frescos procedentes de especímenes cuyos datos bioantropológicos estaban registrados. El calibre de la arteria comunicante anterior fue de 1.68 mm y la longitud, en promedio, de 2.50 mm. En el lado derecho el segmento A1 de la arteria cerebral anterior tenía una longitud de 12.91mm y un calibre de 2.39 mm. En el lado izquierdo, la...
Tipo: Journal article
Palavras-chave: Arteria comunicante anterior; Arteria cerebral anterior; Círculo arterial del cerebro; Índice cefálico.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200012

ANÁLISIS BIOMÉTRICO ENTRE MEDICIONES BIOANTROPOLÓGICAS CEFÁLICAS Y LA ARTERIA BASILAR
Provedor de dados: 77
Autores: Mandiola,E; del Sol,M; Olave,E; Alarcón,E; Montero,C; Sanhueza,P; Oñate,J. C.
De acuerdo a la literatura anátomo-clínica, se hace necesario disponer de mayor información respecto a las arterias que componen el sistema vértebro-basilar como elementos de la fosa posterior del cráneo, dada su importancia en cirugía. El objetivo de este estudio es complementar los datos obtenidos en trabajos previos, estudiando la relación biométrica entre el índice cefálico, la fosa cerebelar, el clivus y la arteria basilar de los especímenes observados. El trabajo se efectuó en el sistema arterial de 70 cerebros formolizados. Los cálculos estadísticos fueron realizados usando el programa computacional Prisma 2.3, análisis de varianza, chi cuadrado y test de Student. En el grupo dólico-mesocéfalo, la arteria basilar presentó una longitud promedio de...
Tipo: Journal article
Palavras-chave: Indice cefálico; Bio-antropología; Arteria basilar.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000200011

ANÁLISIS CITOGENÉTICO EN POBLACIONES DE ALSTROEMERIA HOOKERILODD. SSP. HOOKERI (ALSTROEMERIACEAE) EN LA REGIÓN DEL BÍO-BÍO, CHILE
Provedor de dados: 73
Autores: Cajas,Daniel; Baeza,Carlos; Ruiz,Eduardo; Negritto,María.
Alstroemeria L. (Alstroemenaceae) es un género de monocotiledoneas americano, con dos centros de distribución en el continente: Brasil y Chile. En Chile está representado por alrededor de 33 especies, la gran mayoría de ellas distribuidas en la zona central del país, área reconocida por su alto nivel de endemismo. El "complejo" Alstroemeria hookeri es endémico de Chile y se distribuye desde la IV Región de Coquimbo hasta la VIII Región del Bío-Bío. La subespecie hookeri está presente en la VII Región del Maule y en la VIII Región del Bío-Bío. En esta última existen dos centros de distribución de esta subespecie separados por la Cordillera de la Costa. Un centro se ubica en la zona costera de la región y el otro centro está ubicado en el interior,...
Tipo: Journal article
Palavras-chave: Alstroemeriaceae; Complejo Alstroemeria hookeri; Endemismo; Citogenética.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200001

Análisis citotaxonómico del complejo Alstroemeria diluta E. Bayer (Alstroemeriaceae) de Chile
Provedor de dados: 73
Autores: Baeza,Carlos M.; Finot,Víctor L.; Ruiz,Eduardo; Carrasco,Pedro; Novoa,Patricio; Rosas,Marcelo.
RESUMEN Alstroemeria L. es uno de los géneros de plantas chilenas más diversos y con un enorme potencial ornamental. Está representado por 35 especies, la mayoría distribuida entre los 28-38° S en la zona mediterránea de Chile central. Se reconocen 24 complejos, de los cuales 18 presentan problemas de conservación. Uno de estos complejos es Alstroemeria diluta E. Bayer. con dos subespecies: subsp. diluta y subsp. chrysantha Bayer. Alstroemeria diluta crece sólo en Chile; la subsp. diluta se distribuye desde los 34º15'S, en la Región de O'Higgins, hasta Cauquenes (36º00'S), en la Región del Maule y la subsp. chrysantha desde los 28º08'S, en la Región de Atacama, hasta Punta Curaumilla (33º05'S), en la Región de Valparaíso. Se realizó un studio comparativo...
Tipo: Journal article
Palavras-chave: Alstroemeria; Asimetría; Complejo de especies.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200220

Análisis Clínico e Histomorfológico de la Mucosa Oral Normal, Hiperplasia Fibroepitelial Inflamatoria Oral y Displasia Epitelial Oral
Provedor de dados: 77
Autores: Gordón-Núñez,Manuel Antonio; Silva Júnior,Francisco Lopes da; Lucena,Hévio Freitas de; Galvão,Hébel Cavalcanti; De Souza,Lélia Batista; Pereira Pinto,Leão.
El desarrollo del cáncer oral puede darse a partir de una mucosa aparentemente normal o a partir de una lesión precursora inicial, las cuales pueden representar pasos diferentes del proceso de carcinogénesis epitelial oral. El objetivo de este estudio fue analizar morfológicamente, a través de la técnica de la hematoxilina / eosina, la mucosa oral normal, hiperplasia fibroepitelial oral y displasia epitelial oral, con el propósito de obtener mayor información sobre las alteraciones epiteliales que pueden preceder al establecimiento y evolución de una neoplasia propiamente tal. Fue constatado que muchas de las alteraciones morfológicas observadas en las hiperplasias fibroepiteliales orales probablemente eran asociadas al proceso inflamatorio, donde es...
Tipo: Journal article
Palavras-chave: Mucosa oral; Hiperplasia inflamatoria oral; Displasia epitelial oral; Histomorfología.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200016

Análisis comparativo de índices bióticos utilizados en la evaluación de la calidad de las aguas en un río mediterráneo de Chile: río Chillán, VIII Región
Provedor de dados: 97
Autores: FIGUEROA,RICARDO; PALMA,ALEJANDRO; RUIZ,VICTOR; NIELL,XAVIER.
El uso de macroinvertebrados bentónicos como indicadores biológicos es de larga tradición en los países desarrollados y son incorporados en todas las evaluaciones de calidad ecológica de sistemas fluviales. En América Latina estos estudios son menos frecuentes y las normativas para la protección de los recursos acuáticos recién comienzan a elaborarse, como es el caso de Chile, dejando abierta la posibilidad al uso de criterios biológicos. El presente estudio realiza una adaptación de índices bióticos (IBE, BMWP, IBF y SIGNAL) los que son aplicados y comparados en una cuenca mediterránea de Chile, el río Chillan. Los resultados muestran el mismo patrón de comportamiento para todos los índices, definiendo áreas en buen estado y otras fuertemente impactadas...
Tipo: Journal article
Palavras-chave: Índices bióticos; Macroinvertebrados bentónicos; Chile mediterráneo.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200008

Análisis Comparativo de la Composición Corporal de Árbitros de Fútbol de Brasil y Uruguay
Provedor de dados: 77
Autores: da Silva,Alberto Inácio; de los Santos,Héctor; Cabrera,Carlos.
El objetivo de este estudio fue hacer un análisis comparativo del perfil morfológico de árbitros de fútbol de elite de Brasil y Uruguay. La muestra fue compuesta por 27 árbitros del Brasil, con edad promedio de 37,6±4,2 años, peso de 79,1±7,9 kg y estatura de 179,1±4,8 cm y 14 árbitros de Uruguay con edad promedio de 37,8 ± 3 años, peso de 74,3 ± 7,4 kg y estatura de 175 ± 6,8 cm. Las variables de masa corporal, estatura, grosor de pliegues cutáneos, circunferencias corporales y diámetros óseos, fueron medidas con la finalidad de estimar la composición corporal y determinar el somatotipo de los árbitros. Para determinar la composición corporal se utilizaron: siete pliegues cutáneos, siete circunferencias corporales y cuatro diámetros óseos. Con respecto a...
Tipo: Journal article
Palavras-chave: Árbitros; Fútbol; Composición corporal.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300019

Análisis comparativo del área y morfología foliar en taxones ibéricos amenazados del género Coincya (Cruciferae)
Provedor de dados: 97
Autores: COPETE,MIGUEL A; HERRANZ,JOSÉ M; FERRANDIS,PABLO.
Se evalúa la variación del parámetro área foliar y un índice de morfología foliar (índice de forma) en plantas de 1, 2 y 3 meses de edad pertenecientes a cuatro taxones del género Coincya (Cruciferae) relacionados filogenéticamente. Para todas las edades el área foliar alcanzó sus valores más altos en las formas que tienen frutos con rostros gruesos (C. rupestris), aumentando progresivamente según el siguiente orden: C. monensis subsp. orophila, C. longirostra, C. rupestris subsp. leptocarpa y C. rupestris subsp. rupestris. Se plantea que el aumento del área foliar en los taxones cuyos frutos poseen rostros gruesos puede constituir otra ventaja adaptativa adicional a las ya mencionadas para estos en trabajos anteriores a la vez que refuerza el esquema...
Tipo: Journal article
Palavras-chave: Área foliar; Morfología foliar; Rostro engrosado; Ventaja adaptativa.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000300004

Análisis comparativo del cariotipo en poblaciones de Alstroemeria aurea R. Graham (Alstroemeriaceae) de Chile
Provedor de dados: 73
Autores: Baeza,Carlos M; Schrader,Otto; Ruiz,Eduardo; Negritto,María.
Alstroemeria L. (Alstroemeriaceae), género endémico de América del Sur, presenta dos grandes centros de distribución en el continente: Chile y Brasil. En Chile, está distribuido desde el extremo norte hasta la Patagonia chilena y argentina. La zona central del país presenta el mayor número de especies. Alstroemeria aurea R. Graham crece tanto en Argentina como en Chile, distribuyéndose en nuestro país desde la VII a la XII Región, lo que constituye la especie con el mayor rango de distribución. Es una de las especies de Alstroemeria que presenta un alto grado de variación en el tamaño y en la coloración de los tépalos del perigonio. Se realizó un estudio comparativo del cariotipo de 6 poblaciones de A. aurea provenientes de la VIII y IX regiones del país....
Tipo: Journal article
Palavras-chave: Alstroemeriaceae; Alstroemeria aurea; Cariotipo; Número cromosómico.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100004

Análisis Comparativo del Número de Neurofilamentos en Nervios Isquiáticos de Rata Sometidos a Neuropraxia Tratadas con Láser de Baja Intensidad y Ultrasonido Terapéutico
Provedor de dados: 77
Autores: Matamala,F; Cornejo,R; Paredes,M; Farfán,E; Garrido,O; Alves,N.
Es habitual que tras una compresión nerviosa se aplique terapia, ya sea, a través de laser de baja intensidad (LBI) o ultrasonido (US). El objetivo de este trabajo fue determinar la efectividad de dichos tratamientos para reparar el citoesqueleto neuronal evaluando la variación en el número de neurofilamentos. Se realizó un diseño experimental, en el cual se utilizaron 30 ratas que fueron separadas en 6 grupos: 1- control sano; 2- control lesionado; 3- irradiado con LBI 2J/cm2; 4- irradiado con LBI 10 J/cm2; 5- irradiado con US 0,5W/cm2 y 6- irradiado con US 1W/cm2. Con excepción del grupo 1 los especímenes fueron anestesiados y se les realizó la compresión del nervio isquiático derecho utilizando una presión de 40N durante 45 segundos. Veinticuatro horas...
Tipo: Journal article
Palavras-chave: Nervio isquiático; Compresión nerviosa; Neurofilamentos; Terapia por láser de baja intensidad.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100058

Análisis Crítico de la Literatura Biomédica
Provedor de dados: 77
Autores: Manterola,Carlos; Otzen,Tamara.
Ante el gran número de publicaciones existentes y las que día a día incrementan el volumen total, generando un verdadero "bombardeo de información científica"; resulta un verdadero problema el escoger un estudio que responda a las inquietudes clínicas con un buen nivel evidencia. Para ello, se requiere seguir una metodología científica; definiendo y acotando de forma precisa el problema, para luego transformarlo en una pregunta contestable; aplicando posteriormente una estrategia de búsqueda en una fuente de información apropiada; para finalmente, analizar la información de forma crítica y resumir la evidencia encontrada. Para analizar la evidencia se han desarrollado guías de lectura o guías de usuario; de las que existen diversos formatos, pero que en...
Tipo: Journal article
Palavras-chave: Análisis crítico de la literatura; Lectura crítica; Guías de usuario; Validez interna; Validez externa.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200037

Análisis Crítico de la Literatura: Un Proceso Elemental en el Ejercicio de la Práctica Clínica Basada en la Evidencia
Provedor de dados: 77
Autores: Asenjo-Lobos,Claudia; Manterola,Carlos.
Para realizar una práctica clínica basada en la evidencia (PCBE), se requiere adquirir una serie de habilidades; entre ellas la búsqueda de literatura en forma sistemática y eficiente y la aplicación de reglas formales para la evaluación de la literatura encontrada. De este modo, se logra obtener de forma precisa la mejor evidencia disponible. Es así como, se podría resumir que el proceso de PCBE incluye varios pasos, uno de los cuales es el análisis crítico de la evidencia encontrada en la búsqueda de la literatura. Es fundamental comprender que no toda la información proveniente de revistas científicas es confiable o verdadera y por ende adecuada para ser instaurada como guía para la práctica clínica. Por tal razón, la información debe ser analizada de...
Tipo: Journal article
Palavras-chave: Análisis crítico de la literatura; Lectura crítica; Guías de usuario; Validez interna; Validez externa.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300033

Análisis cualitativo y cuantitativo de la diversidad de mariposas de la Estación Biológica Senda Darwin, ChiloE, X RegiOn, Chile
Provedor de dados: 72
Autores: Concha-Bloomfield,Isabel; Parra,Luis E.
Se informa acerca de la lepidopterofauna diurna recolectada en el verano 2002-2003 en la Estación Biológica Senda Darwin, Chiloé. Se encontraron 9 especies: Eroessa chilensis (Guérin, 1830), Colias vauthierii Guérin, 1829, Nelia nemyroides (Blanchard, 1852), Auca coctei (Guérin, 1838), Homoeonympha humilis (C. &amp;amp; R. Felder, 1867), Hylephila signata (Blanchard, 1852), Butleria flavomaculata tristriata Bryk, 1944, Butleria elwesi Evans, 1939 y Butleria bissexguttata (Philippi, 1859), distribuidas en 3 familias: Pieridae, Nymphalidae y Hesperiidae. La mayor diversidad y homogeneidad se encuentra en los hábitats tipo pradera (H'= 1.59; J'= 0.99; 1-D= 0.79) y tipo bosque bajo y abierto (H'= 1.49; J'= 0.93; 1-D= 0.76), siendo el bosque cerrado el menos...
Tipo: Journal article
Palavras-chave: Bosque templado lluvioso; Lepidoptera; Pieridae; Nymphalidae; Hesperiidae.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200005

Análisis cuantitativo de la investigación en invasiones biológicas en Chile: tendencias y desafíos
Provedor de dados: 97
Autores: QUIROZ,CONSTANZA L; PAUCHARD,ANÍBAL; CAVIERES,LOHENGRIN A; ANDERSON,CHRISTOPHER B.
En las últimas dos décadas, el estudio de las invasiones biológicas ha alcanzado un auge sin precedentes a nivel mundial tanto en sus dimensiones teóricas como aplicadas. En Chile, las invasiones biológicas parecieran ser un tema relativamente nuevo. En este artículo se evalúa la tendencia en la investigación de invasiones biológicas en Chile entre los años 1991 y 2008. El análisis se realizó en plantas y animales, de acuerdo a las temáticas abarcadas en los estudios, y las aproximaciones metodológicas utilizadas. La serie temporal de trabajos publicados en invasiones biológicas en Chile está relacionada significativamente con la tendencia de publicaciones sobre invasiones biológicas a nivel mundial. La mayoría de los estudios en Chile se enfocaron en la...
Tipo: Journal article
Palavras-chave: Ecología de invasiones; Especie adventicia; Especie exótica; Productividad científica.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400005

Análisis de ADN mitocondrial en momias del norte de Chile avala hipótesis de origen amazónico de poblaciones andinas
Provedor de dados: 97
Autores: MORAGA,MAURICIO; ASPILLAGA,EUGENIO; SANTORO,CALOGERO; STANDEN,VIVIEN; CARVALLO,PILAR; ROTHHAMMER,FRANCISCO.
La hipótesis del origen amazónico de las poblaciones andinas basada en el análisis de marcadores genéticos nucleares es contrastada haciendo uso de ADN mitocondrial antiguo aislado de restos esqueletales de poblaciones prehistóricas del Valle de Azapa, Arica, Chile. Se analizaron 42 muestras de las cuales 32 rindieron amplificados para los cuatro marcadores amerindios permitiendo su tipificación. La distribución de haplogrupos (A: 31,2 %, B: 21,9 %, C: 31,2 %, D: 3,1 % y otros 12,5 %) relaciona genéticamente a las poblaciones estudiadas con grupos amazónicos y andinos actuales. El número de muestras analizadas no permite aún una subdivisión por fases cronológicas con el objeto de poner a prueba las hipótesis planteadas por arqueólogos y bioantropológos...
Tipo: Journal article
Palavras-chave: Origen amazónico de poblaciones andinas; Restos esqueléticos; ADNmt antiguo; Microevolución biocultural; Valle de Azapa.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300018

Análisis de coeficientes de sendero para el rendimiento de semillas en Bromus catharticus
Provedor de dados: 118
Autores: Abbott,Liliana A; Pistorale,Susana M; Filippini,Olga S.
Trece genotipos de Bromus catharticus (cebadilla criolla) fueron evaluados para rendimiento en semilla en 2001 y 2002, usando un diseño completamente aleatorizado con seis repeticiones por genotipo. Se analizaron las correlaciones y el coeficiente de sendero para nueve caracteres relacionados con la producción de semilla. La variabilidad genotípica fue estadísticamente significativa para número de semillas totales por panoja en el segundo año (p = 0,019), largo de hoja bandera en los dos años (p = 0,039 y 0,045) y número de macollos por planta en el primer año (p = 0,003). La interacción genotipo x ambiente fue significativa para número de macollos por planta (p = 0,003), número de panojas por planta (p = 0,010), ancho de hoja bandera (p = 0,010) y peso de...
Tipo: Journal article
Palavras-chave: Cebadilla criolla; Componentes del rendimiento; Correlaciones fenotípicas.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000200007

Análisis de Composición Corporal y Somatotipo de Judokas Infantiles y Cadetes en el Campeonato de España 2012
Provedor de dados: 77
Autores: Torres,F. J; Lara-Padilla,E; Sosa-Tallei,G; Berral,F. J.
El objetivo de este estudio es analizar la composición corporal y el somatotipo de judokas participantes en el campeonato escolar de España. Fueron estudiados 57 niños de categoría infantil (13,33±0,66 años) y 40 niños de categoría cadete (15,18±0,74 años) (n=97), mediante un fraccionamiento corporal tetracompartimental y el análisis del somatotipo según el método de Heath-Carter. En categoría infantil obtuvimos una media de 48,11% de masa muscular, 25,49% de masa residual, 14,80% de masa grasa y 11,56% de masa ósea. En categoría cadete, 47.67% de masa muscular, 25,25% de masa residual, 16,46% de masa grasa y 10,57% de masa ósea. Se encontraron diferencias significativas únicamente en el compartimiento de masa ósea entre ambos grupos. El somatotipo medio...
Tipo: Journal article
Palavras-chave: Judo; Antropometría; Fraccionamiento Tetracompartimental; Biotipo.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100033

Análisis de diversidad genética en tres poblaciones de llamas (Lama glama) del noroeste argentino
Provedor de dados: 97
Autores: BUSTAMANTE,ANA V; MATÉ,MARÍA L; LAMAS,HUGO E; GIOVAMBATTISTA,GUILLERMO; ZAMBELLI,ANDRÉS; VIDAL-RIOJA,LIDIA.
Este trabajo describe la variabilidad genética actual de tres poblaciones de llamas (Lama glama) del noroeste argentino (NOA), afectadas a la producción de fibra. Originariamente, las tropas fueron una única población la cual fue subdividida hace 10 años. Se estudiaron muestras de ADN de 77 animales mediante amplificación por PCR de 12 loci microsatélite con cebadores específicos de llama. La alta variabilidad genética comprobada se sustenta en el hallazgo total de 140 alelos diferentes, 9 a 16 alelos por locus y rangos de heterocigosidad observada y esperada por locus de 1 a 0 y 0,9 a 0,47, respectivamente. Diecinueve de treinta y seis pruebas de equilibrio de Hardy-Weinberg mostraron desvíos significativos (P &lt; 0,05) debidos a una deficiencia de...
Tipo: Journal article
Palavras-chave: Camélidos sudamericanos; Diversidad genética; Estructura poblacional; Marcadores microsatélite; Manejo.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200004

ANÁLISIS DE EFICIENCIA Y RENTABILIDAD ECONÓMICA EN DOS LECHERÍAS DE LA REGIÓN DEL MAULE, CHILE
Provedor de dados: 113
Autores: Lobos A.,Germán; Soto R.,Ruth; Zenteno F.,Nelly; Prizant S.,Anita.
Se determinaron indicadores de eficiencia y rentabilidad económica de la producción de leche en dos predios de riego ubicados en la zona de Linares (35º51’ lat. Sur y 71º35’ long. Oeste), Región del Maule, Chile. Para la evaluación económica de los predios, se estimó la tasa de descuento utilizando el Modelo de Valorización de Activos de Capital (CAPM) y el Costo de Capital Promedio Ponderado (Weighted Average Cost of Capital, WACC). Se usaron los indicadores tradicionales de rentabilidad: valor actual neto (VAN), tasa interna de retorno (TIR), índice de valor actual neto (IVAN) y período de recuperación de la inversión (PRI). La producción por vaca ordeña alcanzó a 5.141 y 7.355 L, mientras que la producción por hectárea fue de 9.122 y 8.528 L, para el...
Tipo: Journal article
Palavras-chave: Tasa de descuento; Vaca ordeña; Vaca masa; Valor actual neto; Tasa interna de retorno.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000300011

Análisis de endemismo de moluscos dulceacuícolas de Chile
Provedor de dados: 97
Autores: FUENTEALBA,CARMEN; FIGUEROA,RICARDO; MORRONE,JUAN J.
La diversidad geológica y climática de Chile continental permite la diferenciación de una gran variedad de ecosistemas terrestres y acuáticos. La evidencia de los actuales patrones de distribución de especies dulceacuícolas sugiere en gran medida una relación con las glaciaciones del Pleistoceno y algunos eventos tectónicos postglaciales que afectaron la hidrografía del país. Las especies de moluscos dulceacuícolas en Chile, a diferencia de las especies marinas, han sido escasamente valoradas, a pesar del papel que cumple un importante número de ellas en los ecosistemas. Actualmente no existen estudios biogeográficos que permitan establecer patrones distribucionales y los procesos que los condicionaron. Un análisis de parsimonia de endemismos (PAE) y de...
Tipo: Journal article
Palavras-chave: Biodiversidad; Biogeografía; Moluscos dulceacuícolas; PAE; Zonas hidrográficas.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000200009

ANALISIS DE FORMAS EN ESPECIES CHILENAS DEL GENERO TRICHOMYCTERUS (Osteichthyes: Siluriformes) UTILIZANDO MORFOMETRIA GEOMETRICA
Provedor de dados: 72
Autores: Pardo,R.; Scott,S.; Vila,I.
El género Trichomycterus incluye aproximadamente 120 especies, que se distribuyen comúnmente en las cabeceras de los ríos neotropicales. En Chile este género se encuentra ampliamente distribuido: en el altiplano (14°-22°S) Trichomycterus chungaraensis; T. laucaensis y T. rivulatus, mientras T. areolatus se distribuye entre Huasco (28° 27'S) y Chiloé (41° 27'S), presentando la mayor amplitud en extensión, y en simpatría con T. chiltoni en la cuenca del Bío Bío (36° 49'S). La diversidad de hábitats colonizados por este género habría conllevado cambios morfológicos, los que se analizaron con la técnica morfometría geométrica. Se localizaron siete landmarks del tipo I y II, y se efectuó una superposición de landmarks por el método de GPA (Generalized...
Tipo: Journal article
Palavras-chave: Provincias ictiogeográficas; Landmarks; Relative Warp; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100023

Análisis de Hierro Soluble en Tejidos para Diagnosticar el Déficit de Hierro en Nectarino
Provedor de dados: 113
Autores: Razeto,Bruno; Valdés,Graciela.
El objetivo de la presente investigación fue probar el análisis de hierro total y hierro soluble (activo) en el tejido seco de hoja y brote como indicadores del nivel de abastecimiento de hierro en el nectarino (Prunus persica (L.) Batsch. var. nucipersica C.K. Schneid.). El ensayo se realizó la temporada 2003-2004 en un huerto de nectarinos de ocho años ubicado en un suelo calcáreo (Petrocalcic Calciaquolls). Se seleccionaron cuatro árboles sin síntomas en su follaje, cuatro con síntomas de clorosis férrica de moderada intensidad, y cuatro con severos síntomas de este problema nutricional. El 7 de enero se midió la concentración de clorofila en las hojas mediante el método SPAD y se analizó la concentración de hierro total y hierro soluble en muestras de...
Tipo: Journal article
Palavras-chave: Clorosis férrica; Clorofila; Hierro total; Tejido seco.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000200012

Análisis de la dieta de Diplomystes (Siluriformes: Diplomystidae) de Chile
Provedor de dados: 72
Autores: Beltrán-Concha,M; Muñoz-Ramírez,C; Ibarra,J; Habit,E.
Diplomystidae es reconocida como la familia más primitiva en el orden Siluriformes. En Chile se encuentran tres de las seis especies descritas (género Dyplomystes), las que se distribuyen alopáticamente desde la cuenca del río Rapel hasta la cuenca del río Valdivia (34°S - 40°S), más una población sin identificar a nivel específico en la cuenca del río Baker (47°S). En este trabajo se estudia el contenido estomacal de poblaciones colectadas en todas las cuencas hidrográficas donde se encuentra actualmente la familia en Chile, incluyendo las poblaciones del río Baker. Se analizó un total de 175 individuos de los cuáles el 90,3 % fueron juveniles. Los resultados muestran que, independiente de la procedencia, el principal ítem en la dieta lo constituyen las...
Tipo: Journal article
Palavras-chave: Contenido estomacal; Diplomystes; Centro y Centro Sur de Chile; Río Baker.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300003

ANÁLISIS DE LA ESTABILIDAD ORTOSTÁTICA CRÁNEOCERVICAL EN ADULTOS JÓVENES MAPUCHES
Provedor de dados: 77
Autores: Henríquez,Jorge; Fuentes,Ramón; Sandoval,Paulo; Muñoz,Alejandra.
En la función del sistema cráneomandibular se reconoce como un factor importante la postura de la cabeza sobre la columna cervical. La estabilidad ortostática del cráneo sobre la columna cervical permite un correcto funcionamiento de este sistema. En un estudio anatomorradiológico de casos, se evaluó la estabilidad ortostática cráneocervical de 45 adultos jóvenes de sexo masculino del grupo étnico mapuche. El análisis se realizó a través de telerradiografías, utilizando el cefalograma de Rocabado para evaluar la posición del triángulo hioídeo, el ángulo posteroinferior y el espacio C0-C1. La curvatura cervical se evaluó con la técnica de Penning. En el análisis del ángulo posteroinferior, la media fue de 91.2 ± 7.4 mm, encontrándose bajo el rango normal,...
Tipo: Journal article
Palavras-chave: Alteraciones cráneocervicales; Columna cervical; Mapuche.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000200009

ANALISIS DE LA EVALUACION MAS RECIENTE DEL ESTADO DE CONSERVACION DE LOS ANFIBIOS Y REPTILES DE ARGENTINA
Provedor de dados: 72
Autores: Ubeda,Carmen; Grigera,Dora.
Sobre la base de una evaluación del estado de conservación de la herpetofauna de Argentina, publicada recientemente, se analizan los factores determinantes del estatus asignado, con énfasis en las especies de las categorías que indican una mayor amenaza. De los 484 taxa evaluados el 23 % tiene problemas de conservación. Una proporción importante de estas especies tiene áreas de distribución restringidas, especialización en el uso del hábitat, está poco protegida y sufre acciones extractivas. Se analizan los principales factores de amenaza sobre los herpetozoos, encontrándose que la mayoría está afectada por la alteración del hábitat. Los reptiles sufren el comercio más intensamente que los anfibios. Se comparan los resultados de la nueva evaluación con la...
Tipo: Journal article
Palavras-chave: Estado de conservación; Amenazas; Anfibios; Reptiles; Argentina.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100012

Análisis de la Expresión de Receptores de Estrógenos y Progesterona en el Endometrio de Ovejas de las Razas Romney Marsh y Araucana
Provedor de dados: 77
Autores: Vasconcellos C,Adriana; Paredes H,Marco; Carrasco R,Johanna; Núñez R,Daniela.
El estado morfo funcional del tracto genital de las ovejas hembra es determinado por las hormonas sexuales, las que actúan a través de receptores específicos. Éstos regulan la expresión de numerosas proteínas comprometidas en el desarrollo del endometrio. Posiblemente, el desempeño reproductivo de diferentes razas de ovejas podría estar determinado por la expresión diferencial de los receptores. El objetivo del presente estudio fue analizar la presencia de receptores de estrógenos (RE) y progesterona (RP) en el endometrio de ovejas prepúberes y en ciclo, de las razas Romney Mash y Araucana. La histología del endometrio se realizó en cortes de 5 um teñidos con hematoxilina y eosina. La presencia de ambos receptores se detectó mediante inmunohistoquímica,...
Tipo: Journal article
Palavras-chave: Ovejas; Endometrio; Receptor estrógeno; Receptor progesterona; Razas.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100017

Análisis de la Expresión del Receptor del Estrógeno en Endometrio de Ovejas Alimentadas con Dieta Normal y Dieta Suplementada
Provedor de dados: 77
Autores: Vasconcellos C,Adriana; Paredes H,Marco; Barrientos V,Eduardo; Olmazábal S,Yoselyn; Núñez R,Daniela; Navarrete V,Javiera; Molina E,Benedicto.
Los efectos de la nutrición en reproducción ovina han sido estudiados por numerosos autores. Principalmente, el interés se ha centrado en los efectos de la calidad de la dieta ya que en ovinos sometidos a planos nutricionales bajos se ha observado anormalidades del embrión, fase lutea inadecuada, deficiencia en el aporte de progesterona al útero y falla en los mecanismos que comprenden el reconocimiento materno a la preñez. Existen trabajos sobre la relación alimentación-hormonas sin embargo la información existente sobre los receptores de hormonas esteroidales endometriales, indispensables para que ellas actúen, es muy escasa. El objetivo del presente estudio fue analizar comparativamente la expresión del receptor de estrógenos (RE) en el endometrio de...
Tipo: Journal article
Palavras-chave: Oveja; Endometrio; Receptor de estrógeno; Receptor de progesterona; Nutrición.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400023

Análisis de la Interacción entre el Polimorfismo Rs671 del Gen ALDH2 y Consumo de Alcohol en Individuos Chilenos
Provedor de dados: 77
Autores: Jaramillo,Priscilla C; Fuentes,Katterina; Cortés,Carla; Cisternas,Carlos; Salazar,Luis A.
El alcoholismo es un importante problema de salud pública. En los últimos años ha causado interés el metabolismo del alcohol, puesto que ha sido considerado un posible determinante biológico en la conducta de consumo. Variados estudios se han orientado a la búsqueda y comprensión de la influencia de polimorfismos, en genes que codifican para los principales sistemas enzimáticos que intervienen en el metabolismo hepático. El polimorfismo rs671 del gen que codifica la enzima ALDH2 ha sido asociado a un menor consumo de alcohol debido a la acumulación de acetaldehído en sangre. Diversos estudios indican que este polimorfismo es frecuente en países asiáticos y se considera un factor protector en los individuos que lo portan. Se incluyeron 207 individuos...
Tipo: Journal article
Palavras-chave: Alcoholismo; Marcadores genéticos; ALDH2; Polimorfismo.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100011

Análisis de la Morfología del Raquis Torácico y Lumbar en Mujeres Trabajadoras de una Cooperativa Hortofrutícola
Provedor de dados: 77
Autores: Muyor,José María; López-Miñarro,Pedro A; Casimiro,Antonio J; Nievas,Antonio J; Parrón,Tesifón.
El objetivo del presente estudio fue analizar la disposición angular del raquis torácico y lumbar en bipedestación y sedentación relajada en mujeres trabajadoras de una empresa hortofrutícola. Un total de 50 mujeres (media de edad: 43,62±8,43 años) fueron evaluadas mediante un Spinal Mouse en bipedestación y en sedentación relajada. Los valores angulares medios para el raquis torácico y lumbar fueron de 32,74±8,76 y -21,66±19,12 en bipedestación y de 36,32±10,55 y -1,08±18,14, en sedentación. En bipedestación, un elevado porcentaje de casos (86% y 68,3%) presentaban una cifosis torácica y lordosis lumbar dentro de los valores de normalidad. En sedentación, el 74% presentaban hipercifosis torácica y el 20% una inversión lumbar. En conclusión, aunque en...
Tipo: Journal article
Palavras-chave: Columna vertebral; Postura; Salud laboral; Cifosis; Lordosis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200020

Análisis de las consecuencias del comportamiento adaptativo individual sobre la estabilidad poblacional: El caso del forrajeo óptimo
Provedor de dados: 97
Autores: VALDOVINOS,FERNANDA S; URBANI,PASQUINELL; RAMOS-JILIBERTO,RODRIGO.
Trabajos tempranos basados en la teoría de Sistemas Dinámicos, demostraron que mientras mayor sea el número de poblaciones en interacción ecológica, el sistema tiende a ser más inestable. Sin embargo, la evidencia empírica indica que las poblaciones naturales presentan más frecuentemente dinámicas estables, aun estando inmersas en comunidades complejas. Entre los mecanismos que promueven la estabilización poblacional, se encuentra el comportamiento adaptativo de los individuos componentes de las poblaciones. En este trabajo se analizan los avances teóricos respecto del rol del forrajeo óptimo (FO) como fuerza estabilizadora de las dinámicas poblacionales, en comunidades modelo de diferente nivel de complejidad estructural. El análisis se organiza en torno...
Tipo: Journal article
Palavras-chave: Comportamiento adaptativo; Dieta; Modelos poblacionales; Optimización; Plasticidad fenotípica.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000200001

Análisis de los Grosores Tisulares a Nivel de Nasion y Glabela según Sexo y Biotipo, en Pacientes entre 20 y 27 Años de Edad
Provedor de dados: 77
Autores: Reininger,David; Lillo,Paola; Solé,Pedro.
La población chilena se caracteriza por ser una población muy heterogenea, debido a la gran mezcla exístente entre las distintas etnias y razas a lo largo del tiempo. Esto supone una gran diversidad de formas, tamaños y grosores de estructuras anatómicas, dentro de las cuales ubicamos a los grosores faciales. Si bien existen bases de datos de los grosores tisulares faciales en la población chilena, éstas han sido realizadas a través de técnicas como la ultrasonografía y punción, sin existir estudios realizados en Chile utilizando técnicas radiológicas para medir, como es la telerradiografía de perfil. Los objetivos fueron: 1. Medir los grosores tisulares a nivel de GB y NA, 2. Evaluar correlación de grosores según distribución por sexo y biotipo, 3....
Tipo: Journal article
Palavras-chave: Tejidos blandos faciales; Reconstrucción facial; Resonancia nuclear magnetica; Tomografía computada; Telerradiografía de perfil.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300031

Análisis de los Términos Utilizados en la Literatura Científica para Referirse a la Cápsula Articular y Ligamentos Articulares de la Articulación Temporomandibular
Provedor de dados: 77
Autores: Fuentes,Ramón; Ottone,Nicolás Ernesto; Bucchi,Cristina; Cantín,Mario.
La identificación de las estructuras anatómicas con un término único, informativo y con ausencia de homónimos, entre otros principios, es la tarea primordial que lleva adelante la Federación Internacional de Programas de Terminologia Anatomica (FIPAT) perteneciente a la International Federation of Anatomical Associations (IFAA). Sin embargo, en la literatura científica, sobre todo con orientación clínica y quirúrgica, existen aún dificultades para adoptar la Terminologia Anatomica Internacional (TAI), generándose múltiples denominaciones para una misma estructura anatómica, complicando la comunicación científica. El objetivo de este trabajo fue analizar los términos utilizados en la literatura científica en relación a la cápsula articular y los ligamentos...
Tipo: Journal article
Palavras-chave: Terminologia Anatomica; Cápsula articular; Ligamentos articulares; Articulación temporomandibular.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100049

Análisis de los Términos Utilizados en la Literatura Científica para Referirse a los Ligamentos Extracapsulares de la Articulación Témporomandibular: Parte I: Ligamentum sphenomandibulare
Provedor de dados: 77
Autores: Fuentes,Ramón; Bucchi,Cristina; Cantin,Mario.
La Terminología Anatómica es la base de correcta comunicación anatómica y establece la unificación internacionalmente aceptada para diversas estructuras anatómicas. Sin embargo, su uso en la literatura pedagógica y científica no se ha aplicado por completo. El objetivo de esta investigación fue analizar la literatura en relación al uso correcto de los términos referentes al Ligamento esfenomandibular de la Articulación témporomandibular (ATM). Se realizó una revisión en libros de anatomía y artículos científicos relacionados y se comparó el uso de términos referentes al ligamento esfenomandibular con la Terminología Anatómica Internacional (TAI). Se encontraron diferencias en cuanto a los términos usados (sinonimia) para referirse tanto al ligamento...
Tipo: Journal article
Palavras-chave: Ligamento esfenomandibular; Ligamentum sphenomandibulare; Ligamento anterior del martillo; Ligamento discomaleolar; Terminología Anatómica Internacional.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300038

Análisis de los Términos Utilizados en la Literatura Científica para Referirse a los Ligamentos Extracapsulares de la Articulación Témporomandibular: Parte II: Ligamentum stylomandibulare y Raphe pterymandibulare
Provedor de dados: 77
Autores: Fuentes,Ramón; Ottone,Nicolás; Cantin,Mario; Bucchi,Cristina.
La Terminología Anatómica Internacional (TAI) es la consecuencia de siglos de trabajo científico tendientes a unificar los términos para denominar a las estructuras anatómicas del cuerpo humano y facilitar la comunicación entre la comunidad científica. Sin embargo, su uso en la literatura no se ha aplicado por completo. El objetivo de esta investigación fue analizar la bibliografía en relación a la correcta implementación de los términos referentes al ligamento estilomandibular y al rafe pterigomandibular. Se realizó una revisión en libros de anatomía y artículos científicos relacionados. Se encontraron diferencias en cuanto a los términos usados para referirse tanto al ligamento estilomandibular y al rafe pterigomandibular, como a las estructuras que...
Tipo: Journal article
Palavras-chave: Ligamento estilomandibular; Ligamento pterigomandibular; Rafe pterigomandibular; Terminología Anatómica Internacional.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400027

ANALISIS DE PARAMETROS OCEANOGRAFICOS Y ATMOSFERICOS DEL SENO DE RELONCAVI
Provedor de dados: 72
Autores: Soto-Mardones,Luis; Letelier,Jaime; Salinas,Sergio; Pinillas,E; Belmar,Juan P.
La recopilación de información histórica, tales como mediciones de corrientes, oleaje y viento no ha sido suficiente para describir la dinámica del seno Reloncaví. Sin embargo, a pesar de la información parcelada, las altas magnitudes de corrientes en las zonas de Chaica, Quillaipe y El Paso Nao nos permiten inducir que las corrientes baroclínicas modulan fuertemente la dinámica de la cuenca. Por otro lado, los vientos mostraron una alta variabilidad estacional y son modulados por la línea de costa, siendo estos en parte responsables de la circulación y el oleaje superficial. Además, la circulación superficial en los primeros 10 m esta fuertemente modulada por el ingreso de aguas dulce del estuario de Reloncaví. Además, la máxima amplitud del nivel del mar...
Tipo: Journal article
Palavras-chave: Baroclínicas; Olas; Pluma; Reloncaví; Viento.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100017

Análisis de un Sistema de Implante para Osteosintesis de Huesos Largos, Mediante Simulación Computacional
Provedor de dados: 77
Autores: Sirolli,A; Sanzi,H; Elvira,G.
El diseño de implantes para osteosíntesis es una tarea en continuo desarrollo. Las nuevas técnicas quirúrgicas, procesos de fabricación y materiales, en conjunto con el uso de herramientas de cálculo de la ingeniería de última generación, a partir de la Simulación Computacional, permiten obtener implantes más precisos y de calidad superior y dedicados especialmente a cada tipo de fractura. El diseño adecuado y detallado a partir de estas herramientas de ingeniería, es sometido a ensayos mecánicos para verificar y asegurar su eficacia y resistencia estructural. Un estudio utilizando "Técnicas Avanzadas de Análisis", a través de la Simulación Computacional, posibilitaría verificar el grado de integridad de la unión de una placa y sus tornillos, en conjunción...
Tipo: Journal article
Palavras-chave: Bioingeniería; Osteosíntesis; Fractura; Elementos Finitos.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200029

ANALISIS DEL CARIOTIPO Y DETECCIÓN DE LOS GENES 5S y 18S/25S rDNA EN CHAETANTHERA MICROPHYLLA (CASS.) HOOK. ET ARN. (ASTERACEAE)
Provedor de dados: 73
Autores: Baeza,Carlos M; Schrader,Otto.
Double fluorescence in situ hybridization was used to examine the karyotype of Chaetanthera microphylla (Cass.) Hook et Arn. from Chile, including the location of 5S and 18S/25S rDNA gene sequences. The species is 2n = 24, with 8m + 4st chromosomes. Signals of 5S and 18/25S rDNA were seen in two of the 12 chromosome pairs: n° 2 and 6
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100008

Análisis del Comportamiento Mecánico del Tejido Subyacente a las Tuberosidades Isquiáticas por Medio del Método del Elemento Finito
Provedor de dados: 77
Autores: Araujo-Monsalvo,Víctor M; Silva-Lomelí,José J; Alemán-Pérez,Aylenid; Domínguez-Hernández,Víctor M; Martínez-Cruz,Marcos; Martínez-Coria,Elisa; Gayol-Mérida,Diana A.
Las úlceras por presión son las complicaciones secundarias más comunes a una lesión medular, las cuales ponen en riesgo tanto la salud como la vida de quienes las padecen. Las úlceras por presión más comunes en lesionados medulares aparecen en la región pélvica, principalmente en las tuberosidades isquiáticas (TI's). Una estrategia usada en la clínica es medir la presión generada entre el paciente y la superficie donde se encuentra para evaluar el riesgo que representa dicha superficie para el desarrollo de úlceras por presión sin embargo, este tipo de mediciones superficiales no garantizan que la presión en los tejidos internos subyacentes a prominencias óseas sea inocua. Con el fin de estudiar los mecanismos de formación de úlceras por presión, se...
Tipo: Journal article
Palavras-chave: Úlcera por presión; Lesión de tejido profundo; Análisis por elementos finitos.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300053

Análisis del Conocimiento de la Terminología Anatómica Internacional (TAI) por el Cirujano General
Provedor de dados: 77
Autores: Algieri,Rubén D; Ferrante,María Soledad; Pró,Eduardo.
Hace más de un siglo que se llevan adelante constantes discusiones internacionales para lograr unificar criterios respecto al lenguaje universal en Anatomía, buscando priorizar básicamente un término sobre otros equivalentes, mediante la elección de una nominación única para designar un solo concepto. En el último esfuerzo por consensuar los términos anatómicos, se creó la "Terminología Anatómica Internacional" (TAI) que actualmente ha desplazado a la anteriormente llamada "Nómina Anatómica". Estudio estadístico retrospectivo a través de una encuesta anónima a 96 médicos especialistas en Cirugía General que se realizó en la III Cátedra de Anatomía de la Facultad de Medicina de la Universidad de Buenos Aires, durante el período de mayo/2005 a mayo/2006. Se...
Tipo: Journal article
Palavras-chave: Terminologia Anatomica Internacional; Médico cirujano; Cirugía general; Nivel de conocimiento; Términos anatómicos.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400058

Análisis del IMC y Somatotipo en una Muestra de Adolescentes con Sobrepeso y Obesidad en Temuco-Chile
Provedor de dados: 77
Autores: Silva M,Héctor; Collipal L,Erika; Martínez,Cristian; Torres,Ivonne.
El sobrepeso y la obesidad en Chile se han convertido en una epidemia que sobrepasa todos los sectores sociales. Los factores más importantes han sido el cambio del estilo de vida, económicos, sedentansmo, genéticos, entre otros. El propósito de este estudio fue analizar el índice de msa corporal (IMC) y somatotipo en una muestra de adolescentes con sobrepeso y obesidad de la ciudad de Temuco-Chile. Evaluamos 50 sujetos de ambos sexos (19 hombres 31 mujeres) de 14 a 16 años de edad, de colegios municipalizados de la ciudad de Temuco, IX Región, Chile. Los sujetos fueron evaluados en sus propios colegios. Para obtener el somatotipo utilizamos el método antropométrico de Heath &amp;amp; Cárter, efectuándose la clasificación del IMC de acuerdo a las normas de...
Tipo: Journal article
Palavras-chave: Índice de masa corporal (IMC); Somatotipo.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300032

ANÁLISIS DEL IMPACTO ECONÓMICO DEL CONTRATO INIA-CCU PARA MEJORAMIENTO GENÉTICO DE CEBADA CERVECERA
Provedor de dados: 113
Autores: Campos M.,Arturo; Beratto M.,Edmundo.
En Chile la producción de cebada (Hordeum vulgare L.), se destina principalmente a la fabricación de malta y cerveza. En 1978, el Instituto de Investigaciones Agropecuarias (INIA) y la Compañía Cervecerías Unidas (CCU), la más importante empresa productora de cerveza del país, firmaron un convenio de investigación con el propósito de iniciar trabajos de mejoramiento genético para producir variedades de cebada con altos rendimientos y elevada calidad maltera. Las nuevas variedades creadas a través de este convenio han sido entregadas por CCU a los productores bajo un sistema de contrato de producción. Desde 1978 hasta 1999, INIA introdujo la variedad Aramir y creó las variedades Granifén INIA/CCU, Libra INIA/CCU y Acuario INIA/CCU, que han sido cultivadas...
Tipo: Journal article
Palavras-chave: Cebada; Investigación agrícola; Excedente económico; Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000300010

Análisis del paisaje para la evaluación ecológica rápida de alternativas de relocalización de una ciudad devastada
Provedor de dados: 97
Autores: DE LA BARRERA,FRANCISCO; REYES-PAECKE,SONIA; MEZA,LUIS.
Tras la erupción del volcán Chaitén (Chile) y la destrucción de la ciudad homónima, tres localidades resultaron ser alternativas oficiales para la relocalización de la ciudad. Fandango, Santa Bárbara y Bahía Pumalín fueron evaluadas en un corto plazo a partir de diversos criterios, siendo uno de ellos el potencial impacto de la nueva urbanización sobre la biodiversidad local, a través del análisis del paisaje como herramienta. Los atributos del paisaje evaluados, sobre una imagen satelital LANDSAT 5 (noviembre 17, 2008), fueron (1) composición y representación de cada tipo de ecosistema, (2) conectividad y (3) valor ambiental a través de la clasificación de los ecosistemas dominantes y su estado sucesional, a partir de su heterogeneidad y grado de madurez...
Tipo: Journal article
Palavras-chave: Cambio uso de suelo; Chaitén; Ecología urbana; Evaluación ambiental; Urbanización.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200004

Análisis del Paladar Oseo como Zona Dadora de Injerto
Provedor de dados: 77
Autores: Martínez,Catalina; Inzunza,Oscar; Vargas,Alex.
El paladar óseo podría ser una zona favorable como dadora de injertos, siempre que se pueda determinar con seguridad su grosor. El objetivo de este estudio fue evaluar la correlación entre la altura facial superior y el grosor del paladar óseo. En 29 cráneos secos se midió la altura facial superior, ubicando los puntos craneométricos nasion y prostion. Luego se midió el grosor del paladar óseo de todas las muestras a los 6 y 9 mm a dorsal del conducto incisivo, en la zona paramediana (3 y 6 mm. de la línea media en ambas antímeras). Se realizó el Test de Correlación de Pearson, para establecer si la altura facial puede predecir el grosor del paladar óseo. Existe una gran variabilidad en el grosor del paladar óseo entre los cráneos, con un rango de 0,1 a...
Tipo: Journal article
Palavras-chave: Proceso palatino; Paladar óseo; Injerto óseo libre.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200007

Análisis del Patrón Óseo Trabecular de Mandíbulas Maceradas en Radiografías Panorámicas Digitales
Provedor de dados: 77
Autores: Watanabe,Plauto Christopher Aranha; Monteiro,Solange Aparecida Caldeira; Campbell,Joyce Carvalho Tenfuss; Elejalde,David Alberto Aristizabal.
Nuestro propósito fue estudiar la sensibilidad de la metodología de esqueletonizacion en las alteraciones del patrón óseo trabecular, en radiografías panorámicas digitales. Con el fin de poder utilizar esta metodología a futuro para el análisis y la observación de los cambios de densidad ósea en la estructura trabecular, en pacientes con osteoporosis y sanos. El material examinado consistió en cinco mandíbulas adultas, maceradas. Los 4 sitios de interés de cada mandíbula fueron escogidos en cuerpo mandibular, debajo de los alvéolos dentarios: Sitio 1. Oral y anterior al foramen mentoniano derecho. Sitio 2. Oral y posterior al foramen mentoniano derecho. Sitio 3. Oral y anterior al foramen mentoniano izquierdo. Sitio 4. Oral y posterior al foramen...
Tipo: Journal article
Palavras-chave: Mandíbula; Radiografía Panorámica; Osteoporosis; Densidad ósea.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400013

Análisis del Perfil Antropométrico de Jugadores de la Selección Brasileña de Voleibol Infanto Juvenil
Provedor de dados: 77
Autores: Toledo Fonseca,Cláudio Luís; Roquetti Fernandes,Paula; Fernandes Filho,José.
El voleibol brasileño es reconocido por su excelencia en el ámbito internacional. Las victorias en las categorías de base permiten que jóvenes jugadores talentosos lleguen a las selecciones nacionales. Una herramienta importante en el proceso de selección de jóvenes atletas es la antropometría que evalúa la forma y tamaño de los jugadores. Esta investigación verificó las características antropométricas de los jugadores de la selección infanto juvenil de Brasil. Se evaluaron 16 jugadores con edad de 16,8 0,58 años del sexo masculino convocados para el Campeonato Sudamericano de 2006, utilizando el protocolo de Lohman para verificar la percentaje de grasa y el Somatotipo de Heath &amp;amp; Carter de acuerdo con la posición dentro del campo de juego:...
Tipo: Journal article
Palavras-chave: Antropometría; Composición corporal; Somatotipo; Voleibol.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400009

Análisis del uso de la Terminología Anatómica entre los Estudiantes de la Asignatura Anatomía de la Licenciatura en Medicina, de la Facultad de Medicina de la Universidad Nacional Autónoma de México
Provedor de dados: 77
Autores: Montemayor Flores,Beatriz Georgina; Herrera Vázquez,Ismael; Soto Paulino,Antonio.
La Anatomía puede ser considerada el primer campo científico específico dentro del área de la medicina, es una ciencia concreta, utilizada para describir las estructuras del cuerpo humano, para lo cual ha desarrollado un lenguaje descriptivo específico, preciso, universal, inequívoco, denominado "Terminologia Anatomica" (TA). El Departamento de Anatomía de la Facultad de Medicina de la Universidad Nacional Autónoma de México (UNAM), privilegia el uso de la TAI considerando que los alumnos deben conocerla y utilizarla desde el primer año de la licenciatura en medicina, sin embargo, existe cierta resistencia por parte de alumnos y profesores, los cuales recurren en más de una ocasión al uso de epónimos. El propósito de esta investigación fue el de conocer...
Tipo: Journal article
Palavras-chave: Anatomía; Terminología Anatómica Internacional; Educación Médica.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400017

Análisis Descriptivo de la Reparación Ósea Asociada a Implantes Dentales Endóseos Instalados en Perros con Técnica Sumergida en Dos Períodos de Evaluación
Provedor de dados: 77
Autores: Olate,Sergio; Chaves-Netto,Henrique Duque de Miranda; Jaimes,Miguel; Mazzonetto,Renato; Albergaria-Barbosa,Jose Ricardo de.
Los implantes oseointegrados forman parte de la práctica clínica en diferentes disciplinas de la rehabilitación funcional y estética del hombre donde el área de la odontología no es una excepción; de esta forma, los implantes dentales son una respuesta a la gran demanda de paciente con edentulismo parcial o total. Existe una importante y creciente investigación en implantología, siendo imperativo reconocer las características histológicas de la reparación ósea cuando son instalados implantes dentarios. El objetivo de esta investigación es reconocer las características histológicas descriptivas de la reparación ósea asociada a la instalación de implantes dentales en dos periodos de evaluación. El modelo experimental utilizado en este estudio correspondió al...
Tipo: Journal article
Palavras-chave: Reparación ósea; Implantes dentales; Cirugía experimental.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200023

Análisis experimental de tratamientos floculantes de residuos orgánicos derivados de la producción porcina
Provedor de dados: 118
Autores: dos Santos,Alexandre L; Mora,Freddy.
La producción porcina se considera un importante segmento de la agroindustria Brasileña, cuyo desarrollo depende en parte de la estrategia ambiental adoptada por las empresas. Se examinaron experimentos de tratamientos de residuos orgánicos en una agroindustria porcina localizada en el sur de Brasil. Los siguientes tipos de floculantes fueron considerados como cinco experimentos independientes: Tipo-1: hidróxido de calcio, Tipo-2: sulfato de aluminio + hidróxido de calcio, Tipo-3: hidróxido de calcio + dolomítico, Tipo-4: dolomítico y Tipo-5: sulfato de aluminio, con las siguientes dosis: 0,00-1,25-2,50-5,00-10,00-20,00 mL. Se analizaron los sólidos totales de la fracción sólida (gm³) en un estudio longitudinal. Un experimento paralelo se realizó para...
Tipo: Journal article
Palavras-chave: Biofertilizante; Cerdos; EG; Floculantes; MLG; Residuos orgánicos; Seudo-verosimilitud.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000100006

Análisis Facial, Dentario y Radiográfico de la Normalidad Facial: Estudio Piloto en 29 Mujeres
Provedor de dados: 77
Autores: Huentequeo-Molina,Claudio; Navarro,Pablo; Vásquez,Bélgica; Olate,Sergio.
La estética y armonía facial se relacionan de forma directa con la percepción y autoestima de los individuos; muchas veces se generan deseos de cambios estéticos por medio de cirugías para obtener una valoración positiva de sí mismo. El objetivo de este estudio fue investigar la relación entre la percepción, autoestima y deseo de cambio estético; y puntos antropométricos, cefalométricos y maloclusiones de un grupo de mujeres. Se escogieron 29 mujeres chilenas, entre 20 y 25 años de edad, en las cuales se realizó una encuesta sobre la autoestima, autopercepción de normalidad facial, deseo de cambio estético y cambio de autoestima posterior a una cirugía, éstas se asociaron a través de un análisis de chi2, regresión logística de multivariado y ANOVA, con las...
Tipo: Journal article
Palavras-chave: Estética facial; Antropometría facial; Cefalometría.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100025

Análisis Histológico del Proceso de Reparación en Defectos Óseos: Reconocimiento de Defectos Críticos
Provedor de dados: 77
Autores: Chaves Netto,Henrique Duque de Miranda; Olate,Sergio; Chaves,Maria das Graças Alfonso Miranda; Barbosa,José Ricardo de Albergaria; Mazzonetto,Renato.
Los procedimientos quirúrgicos que envuelven la rehabilitación de la región maxilofacial requieren frecuentemente el uso de injertos para la reconstrucción de de deformidades congénitas o adquiridas. De esta forma, defectos óseos pueden clasificarse como críticos o no críticos. En esta investigación fueron utilizados 6 canes machos realizando 2 defectos bicorticales de 8mm de diámetro en la calota craneal de cada animal; el relleno de las cavidades se realizo como grupo 1 con coagulo sanguíneo y grupo 2 con hueso autógeno en partículas. A través de un an análisis histológico descriptivo se observo en el periodo de tres semanas de sacrificio que el grupo 2 fue el único en presentar regiones de aposición de nuevo tejido óseo. En el periodo de 6 semanas el...
Tipo: Journal article
Palavras-chave: Injerto óseo; Defectos críticos; Reparación ósea.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400027

Análisis Histopatológico del Cartílago Articular Expuesto a Metilprednisolona, Ropivacaína y Ácido Hialurónico en un Modelo Animal de Osteoartrosis
Provedor de dados: 77
Autores: Bustos Latabán,Ranmel; Marino Martínez,Iván Alberto; Romero Díaz,Víktor Javier; Mendoza Lemus,Oscar Fernando; Lara Arias,Jorge; De La Garza Castro,Santiago.
La osteoartrosis es un padecimiento del aparato locomotor con una prevalencia elevada y en crecimiento, paralela al envejecimiento de la población. La infiltración intraarticular de sustancias para aliviar la sintomatología de la osteoartrosis es una práctica común en el consultorio médico de los especialistas que atienden esta enfermedad. Aunque la sintomatología mejora con la infiltración de anestésicos locales, corticoesteroides y suplementos viscosantes, es aún incierto el efecto que estas sustancias tienen sobre la integridad del cartílago articular. Este estudio explora a nivel macroscópico e histológico el efecto de la infiltración de ropivacaína, metilprednisolona y ácido hialurónico sobre el cartílago articular en un modelo de osteoartrosis...
Tipo: Journal article
Palavras-chave: Infiltración intraarticular; Cartílago articular; Osteoartrosis.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400013

ANALISIS ISOENZIMÁTICO EN BRAMA AUSTRALIS VALENCIENNES 1837 (PISCES, PERCIFORMES, BRAMIDAE) EN LA ZONA CENTRO-SUR DE CHILE
Provedor de dados: 72
Autores: Espinoza,Pablo; Galleguillos,Ricardo; Astete,Sofia.
Los resultados muestran un valor de heterocigosidad de 11% si se considera los 12 loci presuntivos analizados. El polimorfismo es de 25%, semejante al reportado en distintas especies de peces marinos. Por otro lado el análisis estadístico de las pruebas Fst y X² sugieren que las poblaciones de Valparaíso y Lebu se ajustan al equilibrio de Hardy-Weinberg. Los valores de Identidad genética (I = 0,996) y Distancia genética de Nei (D = 0,004), demuestran diferencias no significativas
Tipo: Journal article
Palavras-chave: Brama australis; Electroforesis; Variabilidad; Genética; Poblacional; Estructura genética; Heterocigosidad.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200021

Análisis Macroscópico y Microscópico del Desarrollo Embrionario y Fetal en el Gato (Felis catus), en Relación con el Desarrollo de la Vesícula Coriónica y de la Placenta
Provedor de dados: 77
Autores: Illanes,Julio; Orellana,Cupertina; Fertilio,Bárbara; Leyton,Victor; Venegas,Felipe.
La gata doméstica (Felis catus) presenta una gestación que dura, en promedio 62 + 5 días. Sin embargo, establecer la edad gestacional en forma más o menos precisa resulta difícil, ya que no existe un análisis que correlacione el tamaño de la vesícula coriónica; desarrollo de la placenta; desarrollo embrionario y Fetal durante la gestación. En este trabajo se utilizaron 12 úteros grávidos, provenientes de gatas mestizas entre 8 y 18 meses de edad, éstos fueron fijados en formol neutro al 10%. Para cada útero se determinó el número de vesículas coriónicas, de cada una se removieron el embrión, feto y la placenta, los que fueron medidos, tarados y fotografiados para su análisis morfológico. Las etapas del desarrollo embrionario y Fetal fueron establecidas...
Tipo: Journal article
Palavras-chave: Gato; Felis catus; Embriología; Desarrollo embrionario; Desarrollo Fetal.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300002

ANALISIS MOLECULAR EN GASTROPODOS CHILENOS COMERCIALES BASADOS EN LAS SECUENCIAS 16S rRNA,. COI Y ITS1-5.8S rDNA-ITS2
Provedor de dados: 72
Autores: Aguilera-Muñoz,Felipe; Lafarga-Cruz,Fabiola; Gallardo-Escárate,Cristian.
Gastropod mollusks are part of the principal marine resources cultivated and commercialized in Chile. There are native Chilean species such as loco (Concholepas concholepas), locate (Thais chocolata), trumulco snail (Chorus giganteus), keyhole limpets (Fissurella spp.), tegula snail (Tegula atra) as well as exotic species such as red abalone (Haliotis rufescens) and Japanese abalone (Haliotis discus hannai). Despite their importance as marine resources, molecular genetic studies establishing phylogenetic relationships and estimating population genetic parameters are scarce. The aim of this study is to establish a molecular approach among the main commercial gastropod species in Chile. The mitochondrial genes 16S rRNA and COI, and the nuclear ribosomal...
Tipo: Journal article
Palavras-chave: 16S rRNA; COI; ITSl-5.8SrDNA-ITS2; Gastropod mollusks; Phylogenetic relationships.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100003

Análisis Morfológico del Grosor Labial en Individuos Mesofaciales y Braquifaciales en una Población Mexicana
Provedor de dados: 77
Autores: Mariel Cárdenas,Jairo; Arredondo Hernández,Raymundo; Sánchez Meraz,Wulfrano; Mariel Murga,Humberto; Oliva Rodríguez,Ricardo; Gutiérrez Cantú,Francisco Javier.
El objetivo fue determinar las diferencias de grosor y proyección labial en hombres y mujeres mesofaciales y braquifaciales mexicanos a través del análisis de Arnett &amp;amp; Bergman. Se evaluaron 120 radiografías laterales de cráneo usando mediciones lineales y angulares de la cefalometría de tejidos blandos. Se evaluaron las dimensiones: plano oclusal, ángulo interincisal, grosor del labio superior e inferior, ángulo nasolabial, gap interlabial, proyección del labio superior e inferior, plano vertical nasion-menton. Para el análisis estadístico se realizó una prueba ANOVA usando el software minitab versión 15 para determinar las diferencias entre los grupos. No se encontraron diferencias estadísticamente significativas en el plano oclusal del incisivo...
Tipo: Journal article
Palavras-chave: Análisis de tejidos blandos; Grosor de labios; Proyección labial.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400015

Análisis Morfométrico de Hepatoesteatosis Microvesicular Alcohólica de Ratas
Provedor de dados: 77
Autores: Cornejo,R; Garrido,O; Sáez,L; Bustamante,C; Cartes,G.
Un total de 24 ratas hembras de 4 meses de vida con peso aproximado de 250 gramos fueron divididas en dos grupos de animales rotulados como A y B. El grupo A se mantuvo con pellet y agua ad libitum sirviendo como controles mientras que el grupo B conservaba el pellet y recibía una solución de alcohol 40% disuelto en agua lo cual derivó en una esteatosis alcohólica multivesicular. Ambos grupos se mantuvieron en estas condiciones por 60 días. Posteriormente las ratas fueron sacrificadas y se extrajeron muestras tanto de hígado normal-control como de hígado graso para enseguida ser procesadas para microscopía electrónica de transmisión. De hepatocitos normales y esteatósicos se obtuvieron microfotografías electrónicas de transmisión con aumentos finales de...
Tipo: Journal article
Palavras-chave: Esteatosis; Alcohol; Morfometría; Hepatocito.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200019

Análisis Morfométrico de la Mandíbula de Pacientes con Asimetría Facial Asociada a Hiperplasia Condilar: Estudio en Radiografía Panorámica
Provedor de dados: 77
Autores: Zapata,Susana; Medina,Hugo; Saravia,Diego; Navarro,Pablo; Olate,Sergio.
El objetivo de esta investigación es definir características morfológicas en radiografías panorámicas digitales de sujetos con deformidad facial asimétrica asociada a hiperplasia condilar. Se diseño un estudio de corte transversal para estudiar 14 pacientes con la patología identificándose puntos y lineas de medición de forma comparativa entre la hemimandíbula con diagnóstico de hiperplasia condilar ya la hemimandíbula cuyo condilo presenta un crecimiento normal; todas las mediciones fueron realizadas de forma manual de acuerdo a protocolos previamente establecidos. Las variables de análisis fueron tamaño condilar, tamaño de rama mandibular y tamaño del cuerpo de mandíbula en relación al foramen mentual. El análisis de datos fue realizado mediante la...
Tipo: Journal article
Palavras-chave: Asimetría facial; Radiografía panorámica; Hiperplasia condilar.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100028

Análisis Morfométrico de los Reparos Anatómicos Involucrados en la Técnica Quirúrgica de Colocación de Implantes Cigomáticos
Provedor de dados: 77
Autores: Alves,N.
El objetivo de esta investigación fue ofrecer datos morfométricos de las estructuras óseas involucradas en la técnica quirúrgica de colocación de implantes cigomáticos, proveyendo así, informaciones que faciliten la planificación y realización de dicho procedimiento. Considerando los valores promedios obtenidos en nuestro estudio, concluimos que el mayor espesor del hueso cigomático se encuentra en la zona media del hueso. Sugerimos que el anclaje superior del implante cigomático no debe extenderse hasta el margen posterosuperior del hueso cigomático, ya que el espesor del hueso a este nivel no ofrece condiciones de adecuada oseointegración de implantes.
Tipo: Journal article
Palavras-chave: Implantes zigomáticos; Morfometría.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300035

Análisis Morfométrico del Efecto de Estimulaciones de Láser Infrarrojo sobre Núcleos de Hepatocitos de Rata
Provedor de dados: 77
Autores: Cornejo Uribe,Ricardo; Matamala Vargas,Fernando; Silva Mella,Héctor; Garrido Oñate,Orlando; Buchegger Mena,Kurt; Jarpa Hidalgo,Armin.
De ratas Sprague Dawley tanto normales como irradiadas con dosis diarias de 1, 2, 4, 8, y 16 J/cm2 durante 15 días emitidas por el láser AsGa equivalente a 904 nm previamente anestesiadas, fueron quirúrgicamente obtenidas muestras de hígado, las que posteriormente fueron procesadas para microscopía óptica, siendo estudiadas y sometidas a técnicas morfométricas utilizando aumentos de 1000X, con especial énfasis en cuantificar áreas de núcleos y nucleolos. El análisis de los resultados entre hepatocitos normales e irradiados revela que existen marcadas diferencias entre sus áreas tanto nucleares como nucleolares, concluyéndose que los efectos de estas dosis de radiación infrarroja provoca en los hepatocitos una drástica transformación en sus componentes y...
Tipo: Journal article
Palavras-chave: Láser infrarrojo; Hepatocitos; Morfometría.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300018

Análisis Morfométrico del Efecto del Láser Infrarrojo sobre Hepatocitos de Rata
Provedor de dados: 77
Autores: Cornejo,R; Matamala,F; Silva,H; Garrido,O.
El láser infrarrojo emitido por el diodo Arsenurio de Galio (904 nm) proporciona terapia a lesiones articulares por su acción analgésica, cicatrizante y antiinflamatoria, promoviendo a nivel celular síntesis de ATP mitocondrial, modulación de canales de calcio, activando el proceso mitótico e incremento en la síntesis de DNA y de proteínas. Para determinar las dosis que estimulen componentes celulares involucrados en síntesis proteica, del hígado de ratas fueron tomadas muestras de tejido normal e irradiado mediante láser infrarrojo con 1, 2, 4, 8 y 16 Joules/cm² durante 15 días consecutivos. Fueron tratadas para microscopía electrónica de transmisión y se obtuvieron micrografías con aumentos de 10.000 X. Se realizaron estudios morfométricos,...
Tipo: Journal article
Palavras-chave: Hepatocitos; Láser Morfometría Ultraestructura.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300031

Análisis Morfométrico del Número de Odontoblastos en Recubrimientos Directos con Hidróxido de Calcio y Propóleos en Canes
Provedor de dados: 77
Autores: Roig,Andrés; Henríquez,Jorge; Alvear,Marysol; Salazar,Luis A.
El propóleos se ha utilizado en medicina desde épocas antiguas, una de sus indicaciones en medicina oral y odontológica es como material de recubrimiento directo. Así, el objetivo de este estudio fue cuantificar la neoformación odontoblástica en piezas dentarias de canes en recubrimientos directos. Se realizaron perforaciones en un total de 12 piezas dentarias, la mitad de las cuales fueron recubiertas con propóleos y la otra mitad con hidróxido de calcio. En todos los casos se obturaron las piezas dentarias con cemento de vidrio-ionómero. Al cabo de dos semanas, se realizaron las extracciones de las piezas dentarias, fijándolas en formalina tamponada; se efectuaron cortes histológicos de las piezas, los cuales se tiñeron con hematoxilina-eosina, con el...
Tipo: Journal article
Palavras-chave: Propóleos; Neoformación odontoblástica; Recubrimiento Directo; Hidróxido de Calcio.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300021

Análisis Morfométrico Ultraestructural de Células Normales de Glándula Parótida de Rata
Provedor de dados: 77
Autores: Cornejo,R; Garrido,O; Matamala,F; Silva,H; Mardones,A; Lagos,K; Hueichapan,O.
A partir de 10 ratas hembras con un peso aproximado de 250 g y 4 meses de vida, fueron obtenidas quirúrgicamente muestras de glándula parótida las que se trataron con técnicas de microscopía electrónica de transmisión para posteriormente obtener microfotografías de células parotideas con aumentos finales de hasta 21300 X. En las citadas microfotografías se aplicaron técnicas morfométricas con el objetivo de cuantificar las fracciones volumétricas que los distintos componentes ocupan en estas células normales, describiendo de esta manera sus volúmenes y relacionándolos con la funcionalidad que desempeñan en esta célula normal. Se evaluaron las fracciones volumétricas pertenecientes a: citoplasma, núcleo, mitocondrias, retículo endoplasmático rugoso (RER),...
Tipo: Journal article
Palavras-chave: Morfometría; Glándula parótida; Célula acinar.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400010

ANÁLISIS MORFOMÉTRICO Y ULTRAESTRUCTURAL DE COMPONENTES ASOCIADOS A SÍNTESIS PROTEICA EN CÉLULAS MAMARIAS NORMALES Y TRANSFORMADAS
Provedor de dados: 77
Autores: Cornejo U,Ricardo.
Las células mantenidas en cultivo que conservan sus características propias, constituyen un excelente modelo para el estudio de las modificaciones fisiológicas, morfológicas y morfométricas que caracterizan el proceso biológico de la transformación celular. La línea HC11 corresponde a células de epitelio mamario de rata, normales, mantenidas en cultivo, las cuales estimuladas a proliferar con factor de crecimiento epidérmico originan el grupo celular HC11 GM. Cuando estas células normales y proliferantes son transfectadas con el oncogen ras, se determina la generación de un tipo celular transformado, el cual por efecto de las sucesivas mitosis deriva en el grupo celular HC11ras. Estudios de microscopía electrónica, morfológicos y morfométricos permiten...
Tipo: Journal article
Palavras-chave: Transformación celular; Morfometría; Glándula mamaria.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000300008

Análisis Multivariado Aplicado a la Etapa de Deshidratación en la Técnica de Plastinación del Riñón de Caballo
Provedor de dados: 77
Autores: Rivera,M. C; Bonino,F; Fioretti,C; Galán,M; Gigena,S; Moine,R; Mouguelar,H; Natali,J; Quinteros,R.
La Plastinación es la técnica más moderna para la conservación de piezas anatómicas y especímenes. Esta técnica consta de cuatro etapas: fijación, deshidratación, impregnación forzada y curado. Este trabajo pretende mejorar la eficiencia en la producción de órganos plastinados mediante la técnica de Plastinación estándar denominada S 10. Se utilizaron riñones de equinos mestizos criollos provenientes del Frigorífico Aimar S/A, ubicado en la zona rural de Río Cuarto. Luego de realizar la fijación del órgano con formalina se procedió a deshidratarlo. La deshidratación se llevó a cabo en tres sub-etapas donde en cada una de ellas se trabajó a la misma temperatura y se utilizó como solvente una solución de acetona en diferentes concentraciones. Las mediciones...
Tipo: Journal article
Palavras-chave: Plastinación; Acetona; Deshidratación; Riñones; Caballo.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300035

ANALISIS OSTEOLOGICO EN DOS ESPECIES DE MICROLOPHUS (SAURIA, TROPIDURIDAE) DE LA COSTA CHILENO-PERUANA
Provedor de dados: 72
Autores: Vidal,Marcela A.; Ortiz,Juan Carlos.
Se estudió la osteología craneana de Microlophus atacamensis (&lt;A HREF="#Donoso-Barros"&gt;Donoso-Barros 1966&lt;/A&gt;) y Microlophus quadrivittatus (Tschudi 1845) en seis localidades costeras de Chile y Perú. Se consideraron once medidas morfométricas y conteo de algunas estructuras del cráneo. Los resultados indican que ambas especies no muestran diferencias distinguibles desde el punto de vista osteológico. Se propone que la ausencia de caracteres diagnósticos osteológicos entre ambas especies se debe a un reciente proceso de especiación que no ha incorporado cambios morfológicos en su osteología
Tipo: Journal article
Palavras-chave: Tropiduridae; Microlophus atacamensis; Microlophus quadrivittatus; Osteología; Chile; Perú.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100002

Análisis panbiogeográfico de algunas Cactaceae del Ecuador
Provedor de dados: 73
Autores: Loaiza S,Christian R; Morrone,Juan J.
Se analizó la distribución geográfica de 12 especies de cactáceas incluidas dentro de cinco géneros utilizando un enfoque panbiogeográfico, con el fin de identificar los patrones biogeográficos de este grupo y contribuir al estudio de las relaciones biogeográficas de la flora del Ecuador. Las especies seleccionadas se distribuyen principalmente en los bosques secos del norte de Perú y sur del Ecuador. Mediante el análisis de trazos, se identificaron tres trazos generalizados (costero seco, interandino del centro-norte e interandino del sur) y un nodo en la confluencia del segundo y tercer trazos a nivel de la provincia biogeográfica del Occidente de Ecuador.
Tipo: Journal article
Palavras-chave: Cactaceae; Panbiogeografía; Trazos generalizados; Bosques secos; Distribución.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200013

Análisis, síntesis y evaluación de la literatura de lagartos de la Región de Atacama, Chile
Provedor de dados: 72
Autores: Valladares Faúndez,Pablo.
La herpetología ha sido una de las disciplinas científicas más estudiadas de la zoología atacameña, sin embargo su conocimiento es aún insuficiente. Por ejemplo no hay consenso en el número de especies que habitan esta región. Algunos autores estiman que existen alrededor de 18 especies del género Liolaemus, dos subespecies del teiido Callopistes maculatus y una especie de gecko del género Homonota. El presente trabajo tiene como objetivo realizar un análisis crítico de la literatura científica de los lagartos atacameños. Se analizaron las temáticas más desarrolladas, el nivel de conocimiento de las especies y los vacíos que aún existen. Revisamos los rangos de distribución según la literatura y algunas de las colecciones taxonómicas disponibles. Los...
Tipo: Journal article
Palavras-chave: Lagartos de Atacama; Biodiversidad; Endemismo; Riqueza taxonómica.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000100006

Analogy of physicochemical attributes of two grape seeds cultivars
Provedor de dados: 118
Autores: Ahmadi,Seyed Mohammad; Siahsar,Barat Ali.
In this study, a range of physicochemical properties (dimensions, kernel volume, mass unit, bulk and true densities, porosity, terminal velocity, static friction coefficient against different surfaces, oil content and fatty acids composition) of the Bojnordi and Fakhri cultivars of grape seeds were studied. Fatty acid composition for both cultivars of grape seeds consisted of palmitic, stearic, oleic, linoleic and linolenic acid. The values for palmitic, stearic, oleic, linoleic and linolenic acid for the Bojnordi cultivar were 9.56, 4.37, 22.87, 62.85 and 0.33% and for the Fakhri cultivar were 9.22, 4.33, 19.75, 66.40 and 0.28%, respectively. All physical properties of the grape seed cultivars were significantly affacted by the moisture content in the...
Tipo: Journal article
Palavras-chave: Chemical properties; Fatty acid; Grape seed; Physical properties.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000200014

Analysis and Clinical Importance of Superficial Arterial Palmar Irrigation and its Variants over 86 Cases
Provedor de dados: 77
Autores: Ottone,Nicolás Ernesto; Prum,Natalia; Dominguez,Mario; Blasi,Esteban; Medan,Carlos; Shinzato,Sergio; Finkelstein,Diana; Bertone,Vicente Hugo.
The classic description of the hand's superficial palmar arch is based on the anastomosis among the ulnar and radiopalmar arteries, a branch of the radial artery. However, the arch formation is highly variable regarding the size of the arteries that make it up and due to the existence of branches coming from other arteries and adding up as tributary to it. The objective of this paper is to classify these possible varieties, to define the formation of the arch, the reasons for its variable arrangement and the importance of its clinical and surgical applications. 86 formalized hands were dissected at 40%. There is prevalence concerning the size of the ulnar artery, with or without an arch. The anatomic knowledge of the variability in the arch formation...
Tipo: Journal article
Palavras-chave: Superficial palmar arch; Anatomy; Anatomical variations; Hand.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100022

Analysis and sequencing of h6hmRNA, last enzyme in the tropane alkaloids pathway from anthers and hairy root cultures of Brugmansia candida (Solanaceae)
Provedor de dados: 69
Autores: Cardillo,Alejandra B.; Giulietti,Ana M.; Marconi,Patricia L.
Brugmansia candida (Solanaceae) is a native tree distributed across South-American and produces the pharmacologically- important group of tropane alkaloids including scopolamine. This biocompound is synthesised from hyoscyamine by action of Hyoscyamine 6-&amp;beta; hydroxylase (H6H, EC 1.14.11.11) at the end of the tropane alkaloid pathway. Here are reported the tissue and organ-specific expression of h6hmRNA by RT-PCR analyses and the isolation, cloning and sequencing of the cDNA obtained from B. candida anthers and hairy root transformed cultures. Bioinformatic analysis of the nucleotide sequence revealed an uninterrupted ORF of 1038 bp and the predicted aminoacid sequence could be 344 aminoacid long. A database search showed that this sequence has high...
Tipo: Journal article
Palavras-chave: H6H; Hairy roots; Hyoscyamine; Scopolamine; Sequence analysis; Transformation.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300004

Analysis of 5382insC (BRCA1) and 6174delT (BRCA2) mutations in 382 healthy Chilean women with a family history of breast cancer
Provedor de dados: 48
Autores: JARA,LILIAN; AMPUERO,SANDRA; SECCIA,LORENA; BUSTAMANTE,MARIO; BLANCO,RAFAEL; OJEDA,JOSÉ MANUEL.
Breast cancer is the most common malignancy among women. Chilean studies reveal that this cancer presents the third highest mortality rate. A family history of breast cancer is one of the major risk factors for the development of this disease. BRCA1 and BRCA2 are the two main hereditary breast cancer susceptibility genes, and mutations in these genes are related to inherited breast cancer. In specific populations only some mutations have been found to be associated with susceptibility. The purpose of this study was to establish the frequency of 5382insC (BRCA1) and 6174delT (BRCA2) germline mutations in 382 healthy Chilean women with at least two relatives affected with breast cancer and in probands and their relatives from 8 high risk families for breast...
Tipo: Journal article
Palavras-chave: Breast Cancer; BRCA1 and BRCA2 genes; Mutations; Chilean Women.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000100011

Analysis of a suppressive subtractive hybridization library of Alternaria alternata resistant to 2-propenyl isothiocyanate
Provedor de dados: 69
Autores: García-Coronado,Heriberto; Troncoso-Rojas,Rosalba; Tiznado-Hernández,Martín Ernesto; de la Cruz Otero,María del Carmen; Díaz-Camacho,Sylvia Páz; Báez-Flores,María Elena.
Background Isothiocyanates (ITCs) are natural products obtained from plants of the Brassicas family. They represent an environmentally friendly alternative for the control of phytopathogenic fungi. However, as it has been observed with synthetic fungicides, the possibility of inducing ITC-resistant strains is a major concern. It is, therefore, essential to understanding the molecular mechanisms of fungal resistance to ITCs. We analyzed a subtractive library containing 180 clones of an Alternaria alternata strain resistant to 2-propenyl ITC (2-pITC). After their sequencing, 141 expressed sequence tags (ESTs) were identified using the BlastX algorithm. The sequence assembly was carried out using CAP3 software; the functional annotation and metabolic pathways...
Tipo: Journal article
Palavras-chave: Blast2GO analysis; Fungal drug tolerance; Isothiocyanates; Natural fungicides.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400011

Analysis of Agromorphological Descriptors to Differentiate between Duke Cherry (Prunus x gondouinii (Poit. &amp;amp; Turpin)Rehd.) and Its Progenitors: Sweet Cherry (Prunus avium L.) and Sour Cherry (Prunus cerasus L.)
Provedor de dados: 117
Autores: Pérez,Rodrigo; Navarro,Florentino; Sánchez,María Ángeles; Ortíz,Jesús María; Morales,Remedios.
The rapid identification of the hybrids between sweet cherry (Prunus avium L.) and sour cherry (Prunus cerasus L.) is not easy. In order to resolve this problem, 18 Spanish sweet, sour and duke cherry cultivars were surveyed and characterized using 43 agromorphological descriptors evaluated in flowers, leaves, dormant 1-yr-old shoots, fruits, and trees during 2005 and 2006. Based on quantitative parameters, ANOVA and stepwise discriminant analysis (SDA) were carried out. For qualitative descriptors, statistical comparisons were done by means of the chi-square (&amp;#967;2) test. As result of the study, two quantitative (titratable acidity and number of lenticels) and six qualitative descriptors (shape of the central and lateral lobes in the internal bracts...
Tipo: Journal article
Palavras-chave: Rosaceae; Characterization; Quantitative parameters; Qualitative parameters; SDA analysis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100004

Analysis of batch and repeated fedbatch productions of Candida utilis cell mass using mathematical modeling method
Provedor de dados: 69
Autores: Lin,Yutian; Liu,Guoli; Lin,Huibin; Gao,Ling; Lin,Jianqiang.
Background: Candida utilis is widely used in bioindustry, and its cell mass needs to be produced in a cost effective way. Process optimization based on the experimental results is the major way to reduce the production cost. However, this process is expensive, time consuming and labor intensive. Mathematical modeling is a useful tool for process analysis and optimization. Furthermore, sufficient information can be obtained with fewer experiments by using the mathematical modeling, and some results can be predicted even without doing experiments. Results: In the present study, we performed the mathematical modeling and simulation for the cell mass production of Candida utilis based on limited batch and repeated fedbatch experiments. The model parameters...
Tipo: Journal article
Palavras-chave: Candida utilis; Fermentation; Genetic algorithm; Mathematical model.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400002

Analysis of Behavior of Forces in a Pelvis-Soft Tissue Mechanical Model
Provedor de dados: 77
Autores: Gayol-Mérida,Diana Alicia; Enríquez-Rivera,Luis Alberto; Araujo-Monsalvo,Víctor Manuel; Alemán-Pérez,Aylenid; Baez-Rivas,Livier; Domínguez-Hernández,Víctor Manuel.
Pressure ulcers are tissue damage resulting from the constant pressure on the underlying soft tissue to bony prominences for long periods. Some of the most common ulcers are developed at the ischial tuberosities area (ITs). It has been found that stresses produced in the underlying tissue to the ITs may exceed 5 to 11 times the surface stresses, making it necessary to estimate the forces generated between the soft tissue and the ITs. However, it is not possible to determine these stresses in vivo in a patient, due to ethical reasons. This paper presents a mechanical model of the pelvis-soft tissue in order to study the behavior of contact forces. The model simulates the load on the ITs of a male subject of 70 kg weight and 1.70 m height, which were...
Tipo: Journal article
Palavras-chave: Pressure ulcer; Pressure sensor; Mechanical model.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300028

Analysis of Bone Variations of the Occipital Bone in Man
Provedor de dados: 77
Autores: da Mata,João Roberto; da Mata,Fabiana Ribe; Aversi-Ferreira,Tales Alexandre.
Inadequate ossification of the interparietal region induces the appearance of interparietal and wormian bones, also associated with genetic factors. The formation of the interparietal bone depends on the separation of the intermediate segment from the lateral plate by the transverse occipital suture, which means that this bone is formed by the medial and lateral plates. Wormian interparietal bones or epactal bones are located within the interparietal region, being single or multiple, and are located in the upper central region of the interparietal region, the sutural bones, however, are formed from additional ossification centers that can occur in near sutures. The aim of this work was to macroscopically evaluated the presence of changes in the structure...
Tipo: Journal article
Palavras-chave: Skull; Human; Interparietal bone; Sutural bone.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100035

Analysis of chlorophyll fluorescence reveals stage specific patterns of chloroplast-containing cells during Arabidopsis embryogenesis
Provedor de dados: 48
Autores: TEJOS,RICARDO I; MERCADO,ANA V; MEISEL,LEE A.
The basic body plan of a plant is established early in embryogenesis when cells differentiate, giving rise to the apical and basal regions of the embryo. Using chlorophyll fluorescence as a marker for chloroplasts, we have detected specific patterns of chloroplast-containing cells at specific stages of embryogenesis. Non-randomly distributed chloroplast-containing cells are seen as early as the globular stage of embryogenesis in Arabidopsis. In the heart stage of embryogenesis, chloroplast containing cells are detected in epidermal cells as well as a central region of the heart stage embryo, forming a triangular septum of chloroplast-containing cells that divides the embryo into three equal sectors. Torpedo stage embryos have chloroplast-containing...
Tipo: Journal article
Palavras-chave: Chloroplast; Plastid differentiation; Embryogenesis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000100012

Analysis of Dental Arch Dimensions in Three Colombian Ethnic Groups
Provedor de dados: 77
Autores: Padilla,M; Tello,L; Moreno,F; Osorio,J. C; Bedoya,A.
The purpose of this study was to compare dental arch transversal and anteroposterior dimensions in three ethnic groups from Colombia. A digital caliper was used to take 16 transversal and two sagittal measurements, 9 for the upper jaw and 9 for the lower jaw. The sagittal measure determining arch length was drawn from a mesial line traced from first right permanent molar to first left permanent molar, and a perpendicular line from the point of contact between central incisive teeth, both for the upper and lower jaw. The dimensions of upper dental arch in the three ethnic groups showed differences in intercanine distance, as well as between premolar and between molar teeth. The same differences were found for lower dental arches. The populations evaluated...
Tipo: Journal article
Palavras-chave: Dental arch; Arch length; Ethnic groups.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100015

Analysis of diversity among six populations of Colombian mango (Mangifera indica L. cvar. Hilacha) using RAPDs markers
Provedor de dados: 69
Autores: Díaz-Matallana,Marcela; Schuler-García,Ingrid; Ruiz-García,Manuel; Hodson de Jaramillo,Elizabeth.
Currently in Colombia, there are only records of morph-agronomic characterizations of Mangifera indica cvar. Hilacha; molecular studies on this mango variety have not been carried out. The aim of this work was to identify the genetic diversity of six populations of mango Hilacha by RAPDs markers, as a fundamental base for breeding programs, conservation and selection of promissory materials for the fruit industry at the national level. From 60 primers evaluated in the populations, five primers were selected and were launched in the six populations. Polymorphic bands of RAPDs were transformed into binary matrices, which were then processed with NTSYS-PC, POPGENE and TFPGA softwares. The overall genetic diversity, H T = 0.468 ± 0.0016, is very similar to the...
Tipo: Journal article
Palavras-chave: Genetic variability; Mango Hilacha; Organoleptic quality; RAPDs.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300001

Analysis of Fetal and Placental Development in Rats after Administration of Hydroalcoholic Extract from the Root of Petiveria alliacea L. (Phytolaccaceae)
Provedor de dados: 77
Autores: Maia,Carina Scanoni; Teixeira,Valéria Wanderley; Teixeira,Álvaro Aguiar Coelho; Pontes Filho,Nicodemos Teles.
We investigated the effect of hydroalcoholic extract the Petiveria alliacea root on fetal and placental development female rats pregnancy. Thirty female rats were mated and divided in groups: I - rats treated with placebo and sacrificed on the 7th day; II - rats treated with hydroalcoholic extract and sacrificed on the 7th day; III - rats treated with placebo and sacrificed on the 14th day; IV - rats treated with hydroalcoholic extract and sacrificed on the 14th day; V - rats treated with placebo for analysis of the offspring; VI - rats treated with hydroalcoholic extract for analysis of the offspring. The extract was administered by gavage in the dosage of 18mg/kg body wt., in 5th day of pregnancy. The implantation sites and placenta were fixed in Bouin...
Tipo: Journal article
Palavras-chave: Petiveria alliacea; Uterus; Placenta; Hydroalcoholic extract.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100023

Analysis of gene expression changes associated with human carcinoma-associated fibroblasts in non-small cell lung carcinoma
Provedor de dados: 48
Autores: Wu,Xiaofen; Ruan,Lei; Yang,Yi; Mei,Qi.
Abstract  Background  This study aimed to investigate the gene expression changes associated with carcinoma-associated fibroblasts (CAFs) involving in non-small cell lung carcinoma (NSCLC).  Methods  We downloaded the GEO series GSE22862, which contained matched gene expression values for 15 CAF and normal fibroblasts samples, and series GSE27289 containing SNP genotyping for four matched NSCLC samples. The differentially expressed genes in CAF samples were identified using the limma package in R. Then we performed gene ontology (GO) and pathway enrichment analysis and protein&amp;#8211;protein interaction (PPI) network construction using the identified DEGs. Moreover, aberrant cell fraction, ploidy, allele-specific copy number, and loss of heterozygosity...
Tipo: Journal article
Palavras-chave: Carcinoma-associated fibroblast; Non-small cell lung carcinoma; Differentially expressed genes; Allele-specific copy number; Functional analysis.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100204

Analysis of gene expression in Kalanchoe daigremontiana leaves during plantlet formation under drought stress
Provedor de dados: 69
Autores: Zhong,Tianxiu; Zhu,Chen; Zeng,Huiming; Han,Liebao.
Background: Kalanchoe daigremontiana is an attractive model system for the study of the molecular mechanisms of somatic embryogenesis and organogenesis competence due to its formation of plantlets with adventitious roots on the leaf margins that are derived from somatic embryos. The suppression subtractive hybridization technique was used to investigate gene expression during asexual reproduction. Leaves from plants subjected to drought stress provided the source of &amp;#8216;Tester&amp;#8217; DNA, and leaves from plants grown under normal conditions provided the &amp;#8216;Driver&amp;#8217; DNA for subtractive hybridization. Results: A total of 481 high quality ESTs were generated, which clustered into 390 unigenes. Of these unigenes, 132 grouped into 12...
Tipo: Journal article
Palavras-chave: Bioinformatics analysis; Real time PCR; Suppression subtractive hybridization.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600004

Analysis of gene expression profiles in response to Sporisorium reilianum f. sp. zeae in maize (Zea mays L.)
Provedor de dados: 69
Autores: Yu,Tao; Wang,Zhenhua; Jin,Xiaochun; Liu,Xianjun; Kan,Shuaishuai.
Background Head smut of maize, which is caused by Sporisorium reilianum f. sp. zeae (Kühn), is a serious disease in maize. In order to reveal the molecular mechanism of the resistance to head smut in maize, a microarray containing ~ 14,850 probes was used to monitor the gene expression profiles between a disease resistant near isogenic line (NIL) and a highly susceptible inbred line after S. reilianum was injected with an artificial inoculation method. Results Levels of expression for 3,532 genes accounting for 23.8% of the total probes changed after inoculation. Gene Ontology analysis revealed that the differentially expressed genes participated in physiological and biochemical pathways. The Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis...
Tipo: Journal article
Palavras-chave: Differentially expressed genes; Head smut resistance gene; Maize; Microarray.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500007

Analysis of genetic and epigenetic variation in in vitro propagated potato somatic hybrid by AFLP and MSAP marker
Provedor de dados: 69
Autores: Tiwari,Jagesh Kumar; Saurabh,Shaumaya; Chandel,Poonam; Singh,Bir Pal; Bhardwaj,Vinay.
Background: Genetic and epigenetic changes (DNA methylation) were examined in the tissue-culture propagated interspecific potato somatic hybrids between dihaploid Solanum tuberosum and S. pinnatisectum. Amplified fragment length polymorphism (AFLP) and methylation-sensitive amplified polymorphism (MSAP) were applied to detect the genetic and epigenetic changes, respectively in the somatic hybrids mother plants (1st cycle) and their regenerants (30th cycles sub-cultured). Results: To detect genetic changes, eight AFLP primer combinations yielded a total of 329 scorable bands of which 49 bands were polymorphic in both mother plants and regenerants. None of the scorable bands were observed in term of loss of original band of mother plant or gain of novel band...
Tipo: Journal article
Palavras-chave: AFLP; DNA methylation; In vitro propagation; MSAP; Potato; Somatic hybrids.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600005

Analysis of genetic diversity among Indian niger [Guizotia abyssinica (L. f.) Cass.] cultivars based on randomly amplified polymorphic DNA markers
Provedor de dados: 69
Autores: Nagella,Praveen; Hosakatte,Niranjana Murthy; Ravishankar,K.V.; Hahn,Eun-Joo; Paek,Kee-Yoeup.
Randomly amplified polymorphic DNA (RAPD) markers were used to estimate genetic diversity among 18 cultivars of niger from India. Total genomic DNA was extracted and subjected to RAPD analysis using 80 arbitrary 10-mer primers; 17 primers were selected, which yielded a total of 124 bands, 41.20% of them polymorphic. None of the primers produced unique banding pattern for each cultivar. RAPD data were used to calculate a Squared-Euclidean Distance matrix which revealed a minimum genetic distance between cultivars JNC-6 and N-48 and a maximum distance between IGP-76 and JN-30. Based on the distance matrix, a cluster analysis was done using a minimum variance algorithm. The dendrogram generated, based on Ward&amp;#8217;s method, grouped 18 niger cultivars...
Tipo: Journal article
Palavras-chave: Genetic diversity; Guizotia abyssinica; Molecular markers; RAPD.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100014

Analysis of genetic diversity and differentiation of sheep populations in Jordan
Provedor de dados: 69
Autores: Al-Atiyat,Raed Mahmoud; Salameh,Naser M; Tabbaa,Mohammad J.
Background Genetic diversity of sheep in Jordan was investigated using microsatellite markers (MS). Six ovine and bovine MS located on chromosomes 2 and 6 of sheep genome were genotyped on 294 individual from ten geographical regions. Results The number of alleles per locus (A), the expected heterozygosity (He) and observed heterozygosity (Ho) were measured. Overall A, He and Ho were 12.67, 0.820 and 0.684, respectively. On the other hand, genetic distances undoubtedly revealed the expected degree of differentiation among the studied populations. The finding showed closeness of three populations from south (Maan, Showbak and Tafeilah) to each other. Populations from the middle regions of Jordan (Karak, Madaba, Amman, AzZarqa and Mafraq) were found to be in...
Tipo: Journal article
Palavras-chave: Awassi sheep; DNA microsatellite; Genetic diversity and differentiation.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000400005

Analysis of genetic diversity in Argentinian heterotic maize populations using molecular markers
Provedor de dados: 118
Autores: Morales,Marcelo; Decker,Viviana; Ornella,Leonardo.
Over the past three decades, traditional Argentinean Orange Flint maize cultivars have been replaced by the higher yielding U.S. Yellow Dent germplasms. However, fint cultivars are potentially resistant to biotic and/or abiotic stress. Thus, knowledge of genetic diversity and relationships among fint inbred lines would help reduce genetic vulnerability and broaden the genetic base of crops in national improvement programs. In this study, we report the analysis of 25 inbred Orange Flint germplasms and one dent using 21 microsatellite markers or Simple Sequence Repeats (SSR). The aim was to assess genetic diversity among these accessions and evaluate the usefulness of SSR markers for defning heterotic groups in temperate germplasm. Genetic diversity values...
Tipo: Journal article
Palavras-chave: Cluster analysis; Microsatellite; Zea mays.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100015

Analysis of genetic diversity in the Oryza officinalis complex
Provedor de dados: 69
Autores: Federici,María Teresa; Shcherban,Andrei B.; Capdevielle,Fabián; Francis,Marta; Vaughan,Duncan.
The genetic relationships among 34 accessions of wild rice from Asia, Africa, America and Australia were analysed using RFLP technique. After southern blotting, DNA digestion pattern was hybridised with a highly repetitive DNA sequence of a retrotransposon from a gypsy family of mobile elements. A dendrogram was constructed from RFLP data in which the species clustered according to their genome designation (CC, BB, BBCC and CCDD genomes). Some species did not appear in the same group, for example, O. eichingeri from Africa and Sri Lanka clustered separately from each other. The same situation was observed for the accessions from China of O. officinalis, which cluster together showing a close relationship with O. rhizomatis, and O. eichingeri (both of CC...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200012

Analysis of genetic variability by ISSR markers in Calibrachoa caesia
Provedor de dados: 69
Autores: Pérez de la Torre,Mariana; García,Martín; Heinz,Ruth; Escandón,Alejandro.
Background: Calibrachoa Cerv. (ex La Llave &amp;amp; Lexarza) is a genus of the Solanaceae family (La Llave and Lexarza, 1825). This genus has a high ornamental and economic value due to its intrinsic variability and multiplicity of flower colours. In Argentina there are eight native species, and one of them is Calibrachoa caesia. The genetic diversity among 35 accessions of C. caesia, from five departments in the province of Misiones, was analyzed using ISSR markers. Results: Thirteen ISSR primers yielded a reproducible banding pattern, with 701 amplified loci and 98% of polymorphism. The ISSR primers 5’CT, 5’CA, 5’GA, 5’GACA, 3’CAC, 3’TG and 3’TC generated 100% polymorphic patterns. The Rp values ranged from 23.20 to 10.29 for 5’GACA and 3’AG primers,...
Tipo: Journal article
Palavras-chave: Anchored microsatellites; Molecular markers; Ornamental plants.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500008

Analysis of genomic sequences from peanut (Arachis hypogaea)
Provedor de dados: 69
Autores: B,Jayashree; Ferguson,Morag; Ilut,Dan; Doyle,Jeff; Crouch,Jonathan H.
Peanut is an important legume crop across the world. However, in contrast to most legume crops, groundnut lacks taxonomic proximity to any major model genome. A relatively large number of genomic sequences were generated from groundnut as part of a microsatellite marker development project. In the current study, a total of 1312 sequences were analyzed of which 448 contained microsatellite motifs. All sequences (GenBank Accessions: BZ999351-CC000573) were analyzed after clustering for possible similarity with publicly available sequences from Arabidopsis, Lotus, soybean and Medicago. At least 39% of the sequences analyzed had significant BLAST similarities with sequences from the four databases searched, of which nearly half (47%) found significant...
Tipo: Journal article
Palavras-chave: Arachis hypogaea; Codon usage; Gene-based markers; Peanut; SSR markers.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300002

Analysis of Hydraulic Conductance Components in Field Grown, Mature Sweet Cherry Trees
Provedor de dados: 117
Autores: Oyarzún,Ricardo; Stöckle,Claudio; Whiting,Matthew.
As a necessary step towards understanding soil water extraction and plant water relationships, the components of hydraulic conductance (K) of mature sweet cherry (Prunus avium L.) trees were evaluated in situ based on a Ohm´s law analog method. In June 2004, K was determined for 10-yr-old ‘Bing’/‘Gisela® 5’ trees, from simultaneous measurements of whole canopy gas exchange and leaf (sunlit and shaded) and stem water potentials (&amp;#936;). Leaf water potential of sunlit leaves was lower than shaded leaves, reaching minimum values of ca. -2.3 MPa around 14:00 h (solar time). Average total hydraulic conductance was 60 ± 6 mmol s-1 MPa-1, presenting a slight decreasing trend as the season progressed. The analysis of tree K components showed that it was...
Tipo: Journal article
Palavras-chave: Plant water relations; Transpiration; Water potential; Whole-canopy gas exchange.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100006

Analysis of international competitive positioning of quality wine from Spain
Provedor de dados: 118
Autores: Castillo,Juan Sebastián; García,Mª Carmen.
J.S. Castillo, and M.C. García. 2013. Analysis of international competitive positioning of quality wine from Spain. Cien. Inv. Agr. 40(3): 491-501. The global vitiviniculture sector is undergoing systemic and thorough changes. Spain occupies a privileged position in the global industry, ranking first in surface area, third in production and second in export volume. In recent years, domestic consumption has experienced a clear and pronounced decline, as observed in France and Italy. Therefore, exportation has become the main commercial avenue for table and quality wine. In Spain, designated quality wine represents 50% of total production and has experienced commercial dynamics in international markets that differ from those affecting table wine. The object...
Tipo: Journal article
Palavras-chave: Agricultural economics; Competitiveness; Designation of origin; Foreign trade; Panel data; Quality wine.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000300003

ANALYSIS OF LAND SAT-5 TM IMAGERY FOR EXTRACTING AQUACULTURE FARMS INFORMATION IN THE KOREAN COASTAL WATERS
Provedor de dados: 72
Autores: Shanmugam,P.; Ahn,Yu-Hwan; Hyung Ryu,Joo.
The objective of the present study is to compare certain conventional satellite image processing techniques with the recently evolved linear spectral unmixing method and to ascertain the best possible technique that can identify and position of aquaculture farms accurately in and around the Younggwang coastal region of Korea. Various conventional techniques existed to extract such information are spectral enhancement and classification. However, these techniques performed on the Landsat-TM imagery do not seem to yield accurate information about the aquaculture farms, and instead lead to misinterpretation and misclassification. A large discrepancy between the actual and extracted information results from spectral confusion and inadequate spatial resolution...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300038

Analysis of major metallic elements in Chilean wines by atomic absorption spectroscopy
Provedor de dados: 118
Autores: Laurie,V. Felipe; Villagra,Evelyn; Tapia,Jaime; Sarkis,Jorge E. S; Hortellani,Marcos A.
A set of 75 wine samples from seven of the major wine producing regions in Chile were analyzed with flame atomic absorption spectroscopy (AAS) to determine their content of major metallic elements (K, Mg, Ca, Na, Fe and Zn). The results obtained were further analyzed with principal component analysis (PCA) in an attempt to loosely discriminate these wines according to grape type and geographical origin. The metal concentrations measured were within normal ranges, according to previously published data from other wine producing countries. Multivariate statistics allowed the possibility to reasonably discriminate between red and white wines, and to show a distinctive pattern of Na concentration, with higher total contents for the wines produced in the...
Tipo: Journal article
Palavras-chave: Wine; Metal; AAS; Multivariate analysis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200008

Analysis of MR Imaging of Wrists in Female Patients with Carpal Tunnel Syndrome and Healthy Controls
Provedor de dados: 77
Autores: Karabulut,Özlen; Tuncer,Mehmet Cudi; Karabulut,Zülfü; Güzel,Ebru.
The objective of this study was to evaluate morphological changes of the median nerve in patients with carpal tunnel syndrome (CTS) and healthy controls, to correlate the MRI findings of wrists. This study compared not only morphological changes of the median nerve and also displayed descriptively structures in carpal tunnel between patients diagnosed with idopathic CTS and healthy controls. Our study involved 60 hand, 30 of hand were evaluated diagnosed with idiopathic CTS and 30 hand as healthy controls bilaterally. Two provocative tests (Phalen's and Tinel's test) were performed on each hand for both the patient group (60 wrist) and the control group (60 wrist). With regard to Phalen and Tinel's test results, 24 and 26 wrists were excluded from patient...
Tipo: Journal article
Palavras-chave: MR imaging; Carpal tunnel syndrome; Cross-sectional area; Signal intensity; Median nerve.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300025

Analysis of mRNA expression profiles of carotenogenesis and astaxanthin production of Haematococcus pluvialis under exogenous 2, 4-epibrassinolide (EBR)
Provedor de dados: 48
Autores: Gao,Zhengquan; Meng,Chunxiao; Gao,Hongzheng; Zhang,Xiaowen; Xu,Dong; Su,Yuanfeng; Wang,Yuanyuan; Zhao,Yuren; Ye,Naihao.
The fresh-water green unicellular alga Haematococcus pluvialis is known to accumulate astaxanthin under stress conditions. In the present study, transcriptional expression of eight genes involved in astaxanthin biosynthesis exposed to EBR (25 and 50 mg/L) was analyzed using qRT-PCR. The results demonstrated that both 25 and 50 mg/L EBR could increase astaxanthin productivity and the eight carotenogenic genes were up-regulated by EBR with different expression profiles. Moreover, EBR25 induction had a greater influence on the transcriptional expression of ipi-1, ipi-2, crtR-B, lyc and crtO (&gt; 5- fold up-regulation) than on psy, pds, bkt; EBR50 treatment had a greater effect on the transcriptional expression of ipi-2, pds, lyc, crtR-B, bkt and crtO than on...
Tipo: Journal article
Palavras-chave: Haematococcus pluvialis astaxanthin 2; 4-Epibrassinolide (EBR) carotenoid genes real-time fluorescence quantitative PCR (qRT-PCR).
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000200012

Analysis of Myenteric Neurons of the Cecum of Diabetic Rats After Supplementation with Ascorbic Acid
Provedor de dados: 77
Autores: Zanoni,Jacqueline Nelisis; Pereira,Priscila Goncalves Cardoso; dos Santos Pereira,Marli Aparecida.
The objective of this work was to investigate the neuroprotective action of the ascorbic acid over the myenteric neurons in the cecum of Wistar rats, four months after induction of the diabetes mellitus experimental with streptozotocin. Three groups with five rats each were used: C- controls, D- diabetic, DA- diabetic treated with ascorbic acid. For evidentiation of the myenteric neurons was carried out to Giemsa's technique. Were evaluated the areas of cell bodies of 500 neurons in each group studied. The quantitative analysis was carried out in an area of 16.6 mm2 in each cecum studied. In the animals diabetic observed elevation of the glycemia and glycated hemoglobin. The supplementation with ascorbic acid was effective under the myenteric neurons of...
Tipo: Journal article
Palavras-chave: Ascorbic acid; Diabetes mellitus; Oxidative stress; Cecum; Streptozotocin.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200013

Analysis of Palatal Rugae Morphology Before and After Orthodontic Treatment by a Digital Image Recognition System
Provedor de dados: 77
Autores: Xiu-Ping,Wu; Jian-Ning,Han; Pan,Fen; Yu-Jin,Wan; Li,Bing.
To analyze the accuracy rate of a digital image recognition system in matching the palatal rugae Morphology after orthodontic treatment, before orthodontic treatment and to provide theoretical evidence for individual identification in the field of forensic dentistry. High-resolution digital images of the palatal rugae were taken under particular conditions from each patient before and after orthodontic treatment. Features of each digital image were extracted using a digital image recognition system and included in the palatal rugae database. Using an MATLAB software system, information matching of the palatal rugae was performed. From the matching results, the accuracy rate of individual identification of orthodontic patients was 100 %, with a Euclidean...
Tipo: Journal article
Palavras-chave: Forensic anthropology; Forensic stomatology; Palatal rugae; Identification; Orthodontic treatment.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200005

Analysis of rhythmic variance - ANORVA. A new simple method for detecting rhythms in biological time series
Provedor de dados: 48
Autores: Celec,Peter.
Cyclic variations of variables are ubiquitous in biomedical science. A number of methods for detecting rhythms have been developed, but they are often difficult to interpret. A simple procedure for detecting cyclic variations in biological time series and quantification of their probability is presented here. Analysis of rhythmic variance (ANORVA) is based on the premise that the variance in groups of data from rhythmic variables is low when a time distance of one period exists between the data entries. A detailed stepwise calculation is presented including data entry and preparation, variance calculating, and difference testing. An example for the application of the procedure is provided, and a real dataset of the number of papers published per day in...
Tipo: Journal article
Palavras-chave: Chronobiology; Time series; Method; ANORVA; Analysis of rhythmic variance; Circaseptan; Cycle; Rhyth.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000500007

Analysis of soil organic matter in tropical soils with near-infrared spectroscopy (NIRS) and chemometrics
Provedor de dados: 118
Autores: Jarquín-Sánchez,Aarón; Salgado-García,Sergio; Palma-López,David J; Camacho-Chiu,Wilder.
The objective of this study was to predict the concentration of soil organic matter (SOM) in tropical soils using near-infrared spectroscopy (NIRS) for samples measured within a polyethylene bag and without a bag. One hundred and fifty six soil samples from the humid tropics of Tabasco, Mexico with contrasting chemical characteristics were selected. The samples were dried, ground, and sieved through 2 mm and 5 mm screens, and their SOM contents were determined using the Walkley-Black method. The soil samples were packed in polyethylene bags, and SOM was measured directly with and without a bag using a quartz probe (FOSS 5000 model of NIRsystems, DK-3400 Hillerod,Denmark) for a range from 1100 to 2000 nm to obtain a prediction model of SOM. The model for...
Tipo: Journal article
Palavras-chave: Chemical analysis; Tropical soil; Optical fiber; Model; Organic matter prediction.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200015

ANALYSIS OF SPACE-TIME VARIABILITY OF THE PLATA RIVER PLUME
Provedor de dados: 72
Autores: Piola,Alberto R.; Romero,Silvia I.
Satellite ocean colour data from the Sea-Viewing Wide Field-of-View Sensor are analyzed to monitor the space-time variability of the Plata river plume over the continental shelf and slope. SeaWiFS Chlorophyll-a (CSAT) product is used to understand the nature of changes in the colour of waters and how this relates to variations in wind direction and river outflow. We use a 5-year data set (1998-2002) of Global Area Coverage monthly mean composites. The analysis of CSAT data reveals strong seasonal variability over the continental shelf with maximum northeastward penetrations in the austral winter (June to August). The plume may reach ~27S, about 1000 km northeast of the Plata estuary. In summer the plume is confined to south of 32&amp;deg;S and the Plata...
Tipo: Journal article
Palavras-chave: Ocean color; River plumes; Plata plume; SeaWiFS.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300030

Analysis of the 3' end regions of the GDF9 and BMPR1B genes in Blackbelly sheep from Yucatán, Mexico
Provedor de dados: 118
Autores: López-Ramírez,Rosa B; Magaña-Sevilla,Héctor F; Zamora-Bustillos,Roberto; Ramón-Ugalde,Julio P; González-Mendoza,Daniel.
The FecB mutation in the BMPR1B gene and the G6, G7 and G8 mutations in the GDF9 gene have been documented in Booroola Merino sheep breeds. These mutations have all been identified in several ovine breeds, such as Belclare, Cambridge. Blackbelly hairy sheep breed, which is well adapted to tropical climates due to its African origin, have 2 to 3 lambs per litter, corresponding to a high prolificacy for a tropical breed. The objective of this investigation was to identify mutations in the cDNA of the BMPR1B and GDF9 genes of 20 Blackbelly ewes selected for their prolificacy (two or more lambs by birth). The results of this study indicate the absence of mutations in these genes from the Blackbelly breed. However, it is important to analyze the 3' end region...
Tipo: Journal article
Palavras-chave: Blackbelly Breed cDNA FecB; 3' PCR-RACE Blackbelly breed FecB; 3' PCR-RACE.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100012

Analysis of the Condyle, Articular Fossa and Mandibular Ramus in Subjects with Active Condylar Hyperplasia
Provedor de dados: 77
Autores: Muñoz,Pablo; Goulart,Douglas Rangel; Olate,Sergio; de Moraes,Márcio; Navarro,Pablo; Fariña,Rodrigo.
Facial asymmetry is relatively common, but it becomes a disease when condylar hyperplasia is involved. The purpose of this investigation was to describe and compare the morphological characteristics of hyperplastic condyles to their non-hyperplastic contralateral side. Fifteen subjects aged between 14 and 29 years with facial asymmetry and diagnosed with unilateral condylar hyperplasia were studied using cone-beam computerized tomography. Linear measurements were taken of the condylar morphology on the sagittal and coronal planes, establishing the size of the articular fossa, mandibular ramus, and other aspects. Sagittal condylar measurements showed significant differences (p=0.028) between the groups (hyperplastic side v/s non-hyperplastic side); ramus...
Tipo: Journal article
Palavras-chave: Facial asymmetry; Condylar hyperplasia; Facial deformity.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300051

Analysis of the contribution and efficiency of the Santuario de la Naturaleza Yerba Loca, 33º S in protecting the regional vascular plant flora (Metropolitan and Fifth regions of Chile)
Provedor de dados: 97
Autores: ARROYO,MARY T. K; MARTICORENA,CLODOMIRO; MATTHEI,OSCAR; MUÑOZ,MÉLICA; PLISCOFF,PATRICIO.
Santuario de la Naturaleza Yerba Loca (SN Yerba Loca), Metropolitan Region (MR), 33º S, Chile is analyzed for its conservation value and efficiency in protecting native vascular plants in a regional context. The reserve's flora of 500 species and subtaxa was evaluated for species richness, endemism, range size and marginally distributed taxa, using species-area analysis, and tendencies in the floras of the MR (1.434 species and subtaxa) and MR-Fifth regions (1,841 species and subtaxa) to set the regional pattern. The reserve (0.7 % of MR land area and 0.3 % MR-Fifth land area) contains 34 % of the MR and 27% of the MR-Fifth floras, and around 16-17 % of the mediterranean-climate area (regions IV-VIII) flora of central Chile. Veech's Relative Richness Index...
Tipo: Journal article
Palavras-chave: Conservation efficiency; Endemism; Hotspot; Protected area; Mediterranean flora; Species richness.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400012

Analysis of the echolocation calis and morphometry of a population of Myotis chiloensis (Waterhouse, 1838) from the southern Chilean temperate forest
Provedor de dados: 118
Autores: Ossa,Gonzalo; Ibarra,José Tomás; Barboza,Kathrin; Hernández,Felipe; Gálvez,Nicolás; Laker,Jerry; Bonacic,Cristián.
Echolocation is characteristic of bats of the suborder Microchiroptera. Though recent studies of echolocation calis in Latin America have generated significant advances in knowledge about distribution, habitat use and ecology of bats, the recording and analysis of bat calis is barely known in Chile. As a first step in studies on the ecology of the endemic Chilean myotis bat (Myotis chiloensis), we carried out morphometric measures and analyzed echolocation calis in a rural site near Pucón (39°15'S 17°W) in the Araucanía Region of southern Chile. During January 2009, we obtained 22 records from captured and 75 records from fiying individuals. The analysis of calis in searching phase showed that the terminal frequency for this species is 43.4 ±1.2 kHz, with...
Tipo: Journal article
Palavras-chave: Myotis chiloensis; Echolocation; Morphometrics; Bats; Chiroptera; Temperate rainforest; Chile.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200013

Analysis of the Height of Lingual Vallates Papillae in Brazilian Individuals
Provedor de dados: 77
Autores: de Oliveira,Emanuelle Ribeiro; Accioly Lins Amorim,Marleyne José Afonso; Bezerra de Sá,Fabrício; de Albuquerque Nogueira,Romildo; de Amorim Júnior,Adelmar Afonso; Martins Araújo,Bruno; Fernandes Veloso Neto,Humberto; Vieira de Mello,Roberto José.
The vallates papillae lingual are located in the surface of the tongue in a area denominated of V lingual and it presents cells gustatory gathered in gustatory buttons. This research evaluated the height papilar in relation to the surface of the tongue of 519 lingual vallates papillae. 45 human tongue samples were selected, of both sexes, inside of the 40-50 year-old age group, obtained from necropsias accomplished in the Service of Verification of Deaths (S.V.O.) of UFPE/Secretaria of Health of the state of Pernambuco, in the city of Recife. The samples were classified different height levels accordingly in relation to the surface of the tongue, not establishing the exact height, where there was the predominance of the height above the lingual surface
Tipo: Journal article
Palavras-chave: Vallates papillae; Tongue; Anatomy.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000100008

Analysis of the Intercaste Transcriptional Profile of Melipona scutellaris Latreille, 1811 (Hymenoptera, Apidae, Meliponini) by mRNA Differential Display
Provedor de dados: 48
Autores: SIQUIEROLI,ANA CAROLINA S; VIEIRA,CARLOS U; CARVALHO-ZILSE,GISLENE A; GOULART,LUIZ R; KERR,WARWICK E; BONETTI,ANA M.
In colonies of Melipona scutellaris Latreille, 1811 workers can be found with four ganglion nerve cells, a morphological characteristic of the queen. It is hypothesized that these workers, called intercastes, or phenocopies, are phenotypically-like workers, but genotypically identical to queens due to this specific trait. Workers with the same number of ganglion as queens seem to be intercastes between queens and workers. Our objective was to analyze the mRNA pro files of workers, queens, and intercastes of M. scutellaris through DDRT-PCR. Three hundred (300) pupae with white eyes were collected and externally identified according to the number of abdominal nerve ganglions: workers (5 ganglions), queens (4 ganglions) and intercastes (4 ganglions). The...
Tipo: Journal article
Palavras-chave: Determination of castes; Intercastes; Melipona sp.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000100011

Analysis of the intronic single nucleotide polymorphism rs#466452 of the nephrin gene in patients with diabetic nephropathy
Provedor de dados: 48
Autores: GONZÁLEZ,RODRIGO; TIRADO,ARES; ROJAS,LUIS A; OSSANDÓN,FRANCISCO J; ALVO,MIRIAM; WOLFF,CARLOS; SEELENFREUND,DANIELA; DURRUTY,PILAR; LOBOS,SERGIO.
We present the analysis of an intronic polymorphism of the nephrin gene and its relationship to the development of diabetic nephropathy in a study of diabetes type 1 and type 2 patients. The frequency of the single nucleotide polymorphism rs#466452 in the nephrin gene was determined in 231 patients and control subjects. The C/T status of the polymorphism was assessed using restriction enzyme digestions and the nephrin transcript from a kidney biopsy was examined. Association between the polymorphism and clinical parameters was evaluated using multivaríate correspondence analysis. A bioinformatics analysis of the single nucleotide polymorphism rs#466452 suggested the appearance of a splicing enhancer sequence in intron 24 of the nephrin gene and a...
Tipo: Journal article
Palavras-chave: Diabetic nephropathy; NPHS1; Polymorphism; Splicing enhancer.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200007

Analysis of the Lingula Shapes in Macerated Mandibles of Brazilian Individuals
Provedor de dados: 77
Autores: Alves,Nilton; Deana,Naira Figueiredo.
The lingula of the mandible is a bone projection that limits medially the mandibular foramen, which is the region where the inferior alveolar neurovascular bundle penetrates. The lingula is an important anatomical landmark used in maxillofacial surgeries and to block the inferior alveolar nerve. The aim of this study was to analyze the different types of lingula found in mandibles of Brazilian individuals, considering aspects such as gender and race. One hundred thirty-two macerated mandibles of Brazilian adult individuals of both sexes, black and white skin colors, were used. The lingula was classified into four types: triangular, truncated, nodular and assimilated. The data were analyzed using Chi-square test and Fisher's exact test. The truncated shape...
Tipo: Journal article
Palavras-chave: Anatomy; Lingula; Mandible; Inferior alveolar nerve.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100007

Analysis of the molecular basis of Xanthomonas axonopodis pv. citri pathogenesis in Citrus limon
Provedor de dados: 69
Autores: Siciliano,Florencia; Torres,Pablo; Sendín,Lorena; Bermejo,Carolina; Filippone,Paula; Vellice,Gabriel; Ramallo,Jackie; Castagnaro,Atilio; Vojnov,Adrian; Marano,María Rosa.
Xanthomonas axonopodis pathovar citri (Xac) causes bacterial citrus canker, a serious disease of most citrus species. Xanthomonas campestris pv. campestris (Xcc) is the causal agent of black rot disease in cruciferous plants. In Xcc, cell-cell signaling is mediated by diffusible signal factor (DSF). Synthesis of DSF depends on RpfB and RpfF. DSF perception and signal transduction have been suggested to involve a two-component system comprising RpfC and RpfG. It has been proposed that these proteins participate in a signal transduction system linking changes in the environment to the synthesis of DSF and the expression of virulence genes. Although the cluster of the rpf genes in Xac has synteny with the corresponding cluster in Xcc, two genes (rpfH and...
Tipo: Journal article
Palavras-chave: Canker; DSF; Extracellular polysaccharide; Quorum sensing.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300005

Analysis of the NMDA in Focal Cerebral Ischemia in Rats
Provedor de dados: 77
Autores: Tirapelli,D. P. C; Carlotti Jr,C. G; Leite,J. P; Lizarte,F. S. N; Tirapelli,L. F; Colli,B. O.
NMDAR (N-methyl-D-aspartate receptor) is one subtype of ionotrophic glutamate receptor which is extensively distributed in the central nervous system (CNS). In the mammalian CNS, NMDAR serves prominent roles in the pathophysiologic process of cerebral ischemia. This study aimed to investigate the pattern of expression of protein and gene of the excitatory neurotransmitter NMDAR in experimental focal cerebral ischemia and the hole of neuroprotection with hypothermia and ketoprofen. 120 rats were randomly divided into 6 groups (20 animals each): control - no surgery; sham - simulation of surgery; ischemic - focal ischemia for 1 hour, without reperfusion; ischemic + intraischemic hypothermia; ischemic + previous intravenous ketoprofen, and ischemic +...
Tipo: Journal article
Palavras-chave: NMDA expression; Cerebral ischemia; Neuroprotection; Hypothermia and ketoprofen.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300035

Analysis of the nuclear localization signal of TRF1 in non-small cell lung cancer
Provedor de dados: 48
Autores: JIAN,HU; LI,SUN; LU-MING,WANG; SU-JUN,JIANG.
Several studies revealed a similar down-regulation of telomeric repeat binding factor 1 (TRF1) in tumors. We have previously reported the TRFl expression levels were down-regulation in non-small cell lung cancer (NSCLC). The regulation of TRFl localization is proposed to be important for the function and expression. The nuclear localization signal (NLS) and nuclear export signal (NES) are often important clues to localization of protein. The objective of the present study was to investigate the NLS and NES of TRFl in NSCLC patients. Thirty (30) patients with NSCLCs had undergone radical operations in The First Affiliated Hospital, College of Medicine, Zhejiang University. DNA sequences of NLSs and NESs were amplified by PCR. The PCR products were analyzed...
Tipo: Journal article
Palavras-chave: Non-small cell lung cancer; Telomeric repeat binding factor 1; Nuclear of localization signal; Nuclear of export signal; DNA sequencing.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200010

Analysis of Uruguayan weedy rice genetic diversity using AFLP molecular markers
Provedor de dados: 69
Autores: Federici,María Teresa; Vaughan,Duncan; Norihiko,Tomooka; Kaga,Akita; Xin,Wang Wang; Koji,Doi; Francis,Marta; Zorrilla,Gonzalo; Saldain,Nestor.
Weedy rice is a serious problem in Uruguayan rice fields since intensification of rice production started about 10 years ago. The genetic diversity of 26 weedy accessions of weedy rice and 6 Uruguayan cultivars were analyzed using AFLP (amplified fragment length polymorphisms) methodology. Abundant polymorphisms were found among samples tested. Using different methods of analysis three groups of samples were revealed. A relationship was found between three groups and morphological traits. One group had a black hull, purple apex and long awn (wild type traits) while another group had straw hull and apex, and short or no awn (domestication traits). The third group included the cultivars analyzed and some weedy rice samples. The weedy rice in this third group...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300008

Anatomía Cardíaca de Pontoporia blainvillei
Provedor de dados: 77
Autores: Pérez,William; Lima,Martin.
El objetivo de este estudio fue describir la conformación interna y externa y la irrigación del corazón del delfín franciscana de la Plata (Pontoporia blainvillei) para lo cual fueron disecados 12 corazones. El pericardio se fijaba caudalmente al diafragma, ventralmente al músculo transverso torácico y, lateralmente, a las costillas y músculos intercostales. El corazón era aplastado dorsoventralmente, su base era craneal, su ápex era compartido por ambos ventrículos. El ventrículo izquierdo era de pared gruesa, mientras que la del ventrículo derecho más delgada y depresible. La cara ventral correspondía a la cara auricular y la cara dorsal a la cara atrial de la Nomina Anatomica Veterinaria, 2005 (NAV). En la conformación interior del atrio derecho...
Tipo: Journal article
Palavras-chave: Delfín del Plata; Anatomía cardíaca; Cardiología; Arterias coronarias.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400010

Anatomía Comparada del Neurocráneo y el Encéfalo de la Raya Mariposa Gymnura micrura (Batoidea: Gymnuridae)
Provedor de dados: 77
Autores: Kobelkowsky,Abraham.
Mediante la comparación del neurocráneo de la "raya mariposa" Gymnura micrura con especies representantes de cinco familias de Batoidea, se reconoce que corresponde al patrón anatómico del orden Myliobatiformes, por la ausencia del rostro, la presencia de una sola fontanela y el mayor desarrollo de los procesos postorbitarios. La especie en estudio difiere de los Urotrygonidae y Dasyatidae por tener los procesos postorbitarios subdivididos. La organización del encéfalo de G. micrura corresponde al patrón anatómico de los Batoidea, sin embargo, a diferencia de los Rhinobatidae, Urotrygonidae y Dasyatidae, el cerebelo es simétrico; en contraste con los Myliobatidae los hemisferios cerebrales son reducidos; y la principal diferencia con relación a los...
Tipo: Journal article
Palavras-chave: Elasmobranchii; Cráneo; Cerebro; Nervios craneales; Órganos sensoriales.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200042

Anatomía comparada del sistema digestivo de las rayas Urotrygon chilensis y Dasyatis sabina (Myliobatiformes)
Provedor de dados: 97
Autores: KOBELKOWSKY,ABRAHAM.
La organización general del sistema digestivo de la raya pinta Urotrygon chilensis y la raya de espina Dasyatis sabina corresponde al patrón morfológico general de los Myliobatiformes. La dentición de estas especies muestra un dimorfismo sexual, consistente en dientes planos en las hembras y dientes puntiagudos en los machos. Entre los músculos mandibulares, el adductor mandibulae es el más complejo. Las cavidades bucofaríngea y visceral son aplanadas dorsoventralmente. El esófago es relativamente largo, el estómago tiene forma de U, el intestino está regionalizado en duodeno, intestino valvular y recto. El mesenterio dorsal está restringido al recto y la glándula rectal. Los caracteres morfológicos más notables que diferencian el sistema digestivo de las...
Tipo: Journal article
Palavras-chave: Cavidad visceral; Dientes; Musculatura visceral; Tracto digestivo.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000300006

ANATOMIA COMPARATIVA DE HOJA Y TALLO EN LOS REPRESENTANTES DE CESTREAE G. DON (SOLANACEAE) DE ARGENTINA
Provedor de dados: 73
Autores: Liscovsky,Iris J; Cosa,María T.
En este trabajo se compara la anatomía de la hoja y del tallo de las 13 especies nativas y cultivadas de Cestrum L. y en Sessea vestioides (Schltdl.) Hunz., de la tribu Cestreae G. Don (Solanaceae) que crecen en Argentina. Se utilizó material de herbario y conservado en FAA. Los caracteres que permitieron una mejor delimitación a nivel específico en la hoja son: la arquitectura de la vena secundaria y de la venación última marginal, los tipos de estomas y tricomas, las características de la cutícula, la presencia de fibras en relación al floema de la vena media y la ocurrencia y abundancia de esclereidas en mesófilo y vena media. En el tallo las características diagnósticas son: la presencia y abundancia de esclereidas en la epidermis, córtex y médula; la...
Tipo: Journal article
Palavras-chave: Arquitectura; Morfología; Órganos vegetativos.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100006

Anatomía de la Cabeza Femoral Humana: Consideraciones en Ortopedia, Parte I. Anatomía y Relaciones Antropométricas del Fémur Proximal
Provedor de dados: 77
Autores: Álvarez San Martín,Raúl; Velutini Kochen,José Antonio.
Las variantes antropométricas son aspectos que han servido como sustento científico para el entendimiento de la vasta patología que afecta a la articulación coxofemoral y para el desarrollo tanto de implantes de reemplazo articular como de técnicas de reconstrucción ósea. En esta revisión se planea exponer los aspectos morfológicos macroscópicos de la cabeza femoral en relación al extremo proximal del fémur, para describir las características anatómicas y funcionales que hacen de ésta, uno de los sitios anatómicos de mayor importancia en la cirugía ortopédica.
Tipo: Journal article
Palavras-chave: Cabeza femoral; Fémur proximal; Variantes anatómicas; Macroestructura; Ortopedia.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200016

Anatomía de la Cabeza Femoral Humana: Consideraciones en Ortopedia, Parte II. Biomecánica y Morfología Microscópica
Provedor de dados: 77
Autores: Álvarez San Martín,Raúl; Velutini Kochen,José Antonio.
Las variantes anatómicas microscópicas y las características biomecánicas de la cabeza femoral son aspectos que han servido como sustento científico para el entendimiento de la vasta patología que afecta a la articulación coxofemoral y el desarrollo tanto de implantes de reemplazo articular como de técnicas de reconstrucción ósea. En esta revisión se exponen los aspectos morfológicos microscópicos y biomecánicos de la cabeza femoral, en relación al extremo proximal del fémur, para describir las características anatómicas microestructurales y funcionales que hacen de ésta, uno de los sitios anatómicos de mayor importancia en la cirugía ortopédica.
Tipo: Journal article
Palavras-chave: Cabeza femoral; Fémur proximal; Microestructura; Biomecánica; Ortopedia.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200010

Anatomía de las Arterias de la Cabeza: Un Recurso Educativo Abierto como Herramienta Digital de Apoyo a la Enseñanza de la Anatomía
Provedor de dados: 77
Autores: Bucarey Arriagada,Sandra; Aravena Torres,Pedro; Pradenas Mera,Ilse; Tiznado Matzner,Gonzalo.
El estudio de la anatomía, de acuerdo a anatomistas y estudiantes alrededor del mundo, requiere del trabajo práctico frente al cadáver y, por reducción de tiempo en la enseñanza de esta disciplina, que estas etapas sean fuertemente apoyadas por tecnologías educativas para responder a las demandas de una sociedad globalizada que promueve la equidad de la educación. En este contexto, una buena respuesta son los "Recursos Educativos Abiertos" (REA). El movimiento de los REA ha tenido un éxito significativo al promover la idea de que el conocimiento es un bien universal. Desde sus comienzos, los REA se consolidaron como claves para la democratización del conocimiento, dado que están disponibles en Internet, con licencia Creative Commons. A través de la...
Tipo: Journal article
Palavras-chave: Anatomía; Enseñanza; Recursos educativos abiertos.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400018

Anatomía del Hígado de la Rata Wistar (Rattus norvegicus)
Provedor de dados: 77
Autores: Möller Bredo,Richard; Vazquez Odo,Noelia.
La rata de laboratorio (Rattus norvegicus albinus) ha sido usada como modelo para investigaciones médicas, biológicas y moleculares, desde hace mucho tiempo. Es interesante el hecho de que no existen descripciones detalladas de la anatomía del hígado y sus ligamentos que lo fijan a la pared. El objetivo de este trabajo es definir en forma clara y acorde a los principios de la Nomina Anatomica Veterinaria el hígado y sus medios de unión en esta especie de mamífero de laboratorio. Se utilizaron 88 ratas (Rattus norvegicus albinus) de entre 250 y 450 gramos. Fueron disecadas en fresco luego de ser eutanasiadas por sobredosis de tiopental sódico intraperitoneal. Se realizó una incisión paramediana que se extendía desde el cartílago xifoides del esternón hasta...
Tipo: Journal article
Palavras-chave: Anatomía; Morfología; Lóbulos hepáticos; Peritoneo.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100012

Anatomía del Peritoneo Digestivo del Ñandú (Rhea americana)
Provedor de dados: 77
Autores: Möller,Richard; Teliz,Diana.
El ñandú (Rhea americana) es un ave corredora autóctona de Sudamérica la cual hace ya algunos años ha despertado cierto interés productivo. Sin embargo, la morfología detallada a nivel de las aves domésticas aún se desconoce en muchos aspectos; entre ellos el peritoneo. El objetivo de este trabajo es describir el peritoneo parietal, visceral y de conexión del ñandú acorde con los principios de la Nómina Anatómica Aviar. Se utilizaron 7 animales adultos; 5 machos y 2 hembras de entre 8 y 25 kg. de peso procedentes de un criadero comercial. Fueron eutanasiados por sobredosis de tiopental sódico. La cavidad peritoneal estaba dividida en una parte craneal (equivalente a 1/3) y una parte caudal al estómago (equivalente a 2/3 del total del abdomen). En la parte...
Tipo: Journal article
Palavras-chave: Aparato digestivo; Viscera; Morfología; Anatomía macroscópica; Ave corredora.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400003

Anatomía del Segmento Prehiliar de la Arteria Renal en Caninos
Provedor de dados: 77
Autores: Salinas,Paulo; Schwerter,Rodolfo.
La literatura anatómica describe, en general, que el riñón canino está irrigado por una arteria renal única. Estudios de campo han demostrado la existencia de variaciones anatómicas en el segmento prehiliar. Esta especie es utilizada como modelo urológico durante el entrenamiento quirúrgico por su fácil obtención, manipulación y tamaño. Estudios han descrito el patrón arterial intra-renal, sin embargo, la anatomía del segmento pre-hiliar de la arteria renal ha sido poco investigada. El objetivo del presente estudio fue describir el patrón arterial renal en el segmento pre-hiliar en caninos. Treinta pares de riñones de caninos fueron disectados y evaluados de acuerdo a 1) número de ramas por arterias renales únicas, 2) altura de origen de las arterias...
Tipo: Journal article
Palavras-chave: Canino; Arteria renal; Variación anatómica; Segmento prehiliar.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300035

Anatomía del sistema caulinar subterráneo de Cyperus corymbosus var: subnodosus (Cyperaceae)
Provedor de dados: 73
Autores: Heinzen,Fernando; Ramos,Julio C; Tivano,Juan C; Vegetti,Abelardo.
Se estudia la anatomía del sistema de ramificación subterráneo en Cyperus corymbosus Rottb. var. subnodosus (Nees et Meyen) Kük. Se describe la anatomía del rizoma y del tubérculo en este taxón. Se realiza un análisis comparativo de las variaciones observadas en diferentes estadios de desarrollo. Las características anatómicas de rizoma y tubérculos están asociadas al típico sistema caulinar subterráneo, a la forma de crecimiento de la especie y a su modo de propagación vegetativa.
Tipo: Journal article
Palavras-chave: Histología; Rizoma; Tubérculo; Cyperus corymbosus; Cyperaceae.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200008

Anatomía del tejido fotosintético de diez taxa de Opuntia establecidos en el secano árido mediterráneo de Chile
Provedor de dados: 97
Autores: HERMAN,SILVA; ACEVEDO,EDMUNDO; SILVA,PAOLA.
Se evaluó el efecto de la exposición de cladodios a la radiación en la anatomía del tejido fotosintético de 10 taxa de Opuntia, (plantas con metabolismo ácido crasuláceo, CAM) establecidos en al secano árido de la IV Región de Chile. A nivel del tejido epidérmico se evaluó el grosor de la cutícula, la densidad de estomas y las dimensiones de células oclusivas. En el tejido fotosintetico, se evaluo las dimensiones celulares con el objeto de estimar la superficie de paredes celulares expuestas al intercambio gaseoso por unidad de tejido fotosintético, relación conocida como Ames/A. Los resultados señalan grandes dimensiones celulares y baja densidad estomática, lo que determina un número reducido de estomas por unidad de superficie en relación a especies de...
Tipo: Journal article
Palavras-chave: Opuntia spp; Anatomía; Cladodios; Tejido fotosintético; Relación de áreas.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200011

Anatomía Microquirúrgica e Irrigación Arterial de la Región Uncal
Provedor de dados: 77
Autores: Avendaño Pradel,Rafael; Martínez Anda,J. Jesus; Torres Villanueva,Mariano; Castillo Rangel,Carlos; Escobar Briones,Carolina; Pineda Martínez,Diego; Arteaga Martínez,Sebastián Manuel.
El objetivo de este trabajo fue realizar una revisión microquirúrgica de los principales ramos arteriales que otorgan irrigación a la región uncal, identificando sus principales variantes y sus relaciones anatómicas mas relevantes con las estructuras circundantes. Se estudiaron 20 hemisferios cerebrales con el sistema arterial perfundido con latex y colorante mediante disección microquirúrgica y bajo aumento con un rango de 3X a 40X. Se realizaron registros morfométricos de las principales estructuras. La irrigación de la región uncal del lóbulo temporal se establece principalmente por tres grupos de ramas uncales: las ramas uncales anteriores provenientes de la arteria temporopolar que es uno de las ramas colaterales que inicialmente se derivan de la...
Tipo: Journal article
Palavras-chave: Rama uncal; Arteria uncal; Arterias del hipocampo; Arteria coroidea anterior.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200056

Anatomía Microscópica de las Glándulas Salivales por Medio de una Técnica Histológica Convencional y no Convencional
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Roa Henríquez,Ignacio Javier.
Las técnicas de fijación y conservación permiten detener los procesos de desorganización de los tejidos y son necesarios para analizar la anatomía microscópica de ellos. El propósito de este estudio fue analizar las características histológicas de las glándulas parótida y submandibular obtenidas a partir de tres cadáveres humanos fijados y conservados mediante: a) solución conservadora en base a formaldehido (muestra I) y b) cámara de frío por 12 horas (muestra II), ambas muestras procesados para hematoxilina-eosina (H-E); c) plastinación con resina epóxica (muestra III) y procesado para H-E y con azul de metileno- eosina sin inclusión previa. Se analizaron las características de los adenómeros y sistema de conductos glandulares. Las mejores...
Tipo: Journal article
Palavras-chave: Técnica histológica; Plastinación; Fijación; Conservación; Glándulas salivales.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300029

ANATOMÍA QUIRÚRGICA DEL NERVIO AURICULOTEMPORAL EN EL ACCESO PRE-AURICULAR
Provedor de dados: 77
Autores: da Silva Torres,Thiago; Lucena Neto,Bernardo; de Oliveira Silva,Geraldo; Monteiro da Silva,Angelo Jorge; Fernandes Dionisio,Renata; de Assis Chaves,Emmanuelly; de Sousa-Rodrigues,Célio Fernando.
Con el objetivo de aportar datos anatómicos, que posibiliten el acceso a la región pre-auricular, con menor riesgo de lesión del nervio auriculotemporal en procedimientos quirúrgicos, fue realizada esta investigación, sobre las relaciones topográficas y biométricas de este nervio con la arteria y vena temporales superficiales y el trago. Fueron disecadas 24 hemicaras de cadáveres fijados con formaldehído al 10%, disponibles en el Laboratorio de Anatomía del Departamento de Morfología Humana de la Universidad Federal de Alagoas, Brasil. En siete casos (29,2%) el nervio subía posteriormente a los vasos temporales superficiales, y en otros siete (29,2%), subía junto a la vena. En tres casos (12,5%) el nervio emergía junto con la arteria. En dos casos (8,3%),...
Tipo: Journal article
Palavras-chave: Nervio auriculotemporal; Región pre-auricular; Trago; Vasos temporales superficiales.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400015

Anatomía y Competencias Clínicas en Odontología: Estudio Basado en Apreciación de Académicos
Provedor de dados: 77
Autores: Aravena Verdejo,Víctor; García-Hernández,Fernando.
Los principales cambios que se están operando en la Educación Superior, corresponden a un replanteamiento de sus currículos, entre otros, la formación de profesionales con perfiles de egreso estructurados en base a competencias. El estudio de la Anatomía, no está ajena a estas innovaciones. Esta asignatura se dicta, tradicionalmente, en los primeros niveles de la formación profesional; sin embargo a la hora de aplicar losconocimientos en situaciones clínicas, éstos deben ser reincorporados o reforzados en los estudiantes, tanto por el tiempo transcurrido entre ambas situaciones de aprendizaje, como por la falta de relación y aplicación en el contexto clínico. En este sentido, cabe entonces preguntarse: ¿Cuáles son las competencias y conocimientos en el...
Tipo: Journal article
Palavras-chave: Anatomía; Odontología; Educación.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500032

Anatomía y Competencias Clínicas en Odontología: Estudio Basado en Apreciación de Estudiantes
Provedor de dados: 77
Autores: García-Hernández,Fernando; Aravena Verdejo,Víctor.
La Anatomía entrega a los estudiantes conceptos sobre la estructura, pero sobre todo un método de estudio y una nomenclatura que serán usados en asignaturas básicas y clínicas, motivo por lo que la disciplina se enseña en los primeros años de la Carrera. La educación basada en competencias enfatiza el producto final y define lo que debe saber el alumno al finalizar su formación, independiente de cómo lo enseñó el profesor o los sistemas de aprendizaje que utilizó. Las competencias finales determinan lo que se ha de enseñar e identifican lo esencial de lo superfluo. Representa el mejor método para acreditar la calidad del "producto elaborado" por cada institución de Educación Superior, el profesional que se envía al medio para cumplir su rol en la...
Tipo: Journal article
Palavras-chave: Anatomía; Odontología; Educación.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400024

Anatomía y Neuroanatomía, Disciplinas Perjudicadas por la Reforma Curricular
Provedor de dados: 77
Autores: Inzunza,Oscar; Vargas,Alex; Bravo,Hermes.
En los últimos tiempos, la docencia en Morfología ha debido enfrentar un escenario cambiante, producto de: a) un cambio curricular que ha llevado a la reducción de las horas destinadas a los cursos de Anatomía y Neuroanatomía; b) la dificultad creciente de obtener material cadavérico para las actividades prácticas de dichos cursos; c) el incremento en el número de alumnos de los cursos de pregrado; y, d) la reducción alarmante de los cultores de estas ciencias básicas del currículo de Medicina. Como resultado de lo anterior, es dable esperar, que esta situación -que tiene un alcance mundial-, más temprano que tarde tenga un efecto en el conocimiento morfológico de los médicos recién formados. En este estudio se analiza el rendimiento obtenido en pruebas...
Tipo: Journal article
Palavras-chave: Anatomía Neuroanatomía; Docencia Reconocimiento de estructuras.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400023

Anatomía y química foliar en especies ornamentales de Arecaceae: posibles barreras a la alimentación de Raoiella indica Hirst (Acari: Tenuipalpidae)
Provedor de dados: 73
Autores: VÁSQUEZ,CARLOS; EGURROLA,ZURICH; VALERA,ROSARIO; SANABRIA,MARÍA E.; COLMENÁREZ,YELITZA.
El ácaro rojo de las palmeras, Raoiella indica Hirst (Acari: Tenuipalpidae), ha sido reportado en 91 especies vegetales hospederas en el Neotrópico. Sin embargo su potencial para alimentarse sobre estas especies puede variar con las características anatómicas y fitoquímicas, las cuales podrían tener influencia en el desarrollo y reproducción del ácaro. En tal sentido fueron evaluadas características anatómicas como ancho de la cutícula-epidermis abaxial, profundidad y ancho del mesófilo, índice y densidad estomática, como también la concentración de grupos de metabolitos secundarios (MS) obtenida por cromatografía de capa fina como posibles barreras para la alimentación del ácaro en 11 especies de Arecaceae de importancia ornamental Coccothrinax...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200012

Anatomic Description of the Ulna of the White-Footed Tamarin (Saguinus leucopus Günther, 1876)
Provedor de dados: 77
Autores: Vélez-García,Juan Fernando; Duque-Parra,Jorge Eduardo; Barco-Ríos,John.
This document is a description of the macroscopic functional anatomy of the ulna bony prominences in the White-footed Tamarin (Saguinus leucopus), a neotropical endemic, and monotypic primate of Colombia. Few studies have been conducted on its anatomy, and thus its ulnar morphology, an essential element for this animal's quadrupedal arboreal locomotion, remains unknown. This study is based on eight specimens, fixed in formalin at 10 % whose ulnas were extracted in order to describe the main bony prominences along with muscular and ligamentous fixation functions. These elements of the locomotor apparatus and the multiple anatomical contours of the ulna of the White-footed Tamarin, exhibit characteristics for positional and articular adjustment with other...
Tipo: Journal article
Palavras-chave: Anatomy; Attachments; Osteology; Primate.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400035

Anatomic Parameters of the Left Coronary Artery: an Angiographic Study in a South African Population
Provedor de dados: 77
Autores: Ajayi,N. O; Lazarus,L; Vanker,E. A; Satyapal,K. S.
An understanding of the left coronary artery (LCA) anatomy is important for accurate diagnosis and therapeutic intervention in the management of coronary arterial diseases. This angiographic study aims to document the parameters of the LCA that may be of importance in the diagnosis and treatment of coronary artery diseases. An analysis of 151 coronary angiograms obtained from the cardiac catheterization laboratory in the eThekwini Municipality area of KwaZulu-Natal, South Africa was performed. The mean length and diameter of the LCA were 10.4±4.1 mm (range 2.8-23.9 mm) and 3.8±0.8 mm (range 2.1-6.5 mm), respectively. The mean angle of division between the two main branches was 86.2°±26.1° (range 27°-68.5°). There was a positive correlation between the...
Tipo: Journal article
Palavras-chave: Coronary arteries; Left coronary artery; Morphology; Morphometry; Coronary dominance.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400039

Anatomic Position of the Pterion among Kenyans for Lateral Skull Approaches
Provedor de dados: 77
Autores: Mwachaka,P; Hassanali,J; Odula,P.
The pterion is a point of sutural confluence seen in the norma lateralis of the skull where frontal, parietal, temporal and sphenoid bones meet. The position of the pterion exhibits population-based variations. Location of this point is important in surgical approaches to the anterior and middle cranial fossae. Specific measurements were taken on both sides of 90 (51 male, 39 female) Kenyan human skulls. The distances from the centerof pterion to the frontozygomatic suture were 38.88+3.49 mm on the right side and 38.24+3.47 mm on the left side. The pterion was 30.35+3.40 mm and 30.34+4.34 mm above the mid point of the zygomatic arch on the right and left sides, respectively. Males had statistically significant higher pteria compared to females being...
Tipo: Journal article
Palavras-chave: Pterion; Frontozygomatic suture; Zygoma; Kenyans.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400023

Anatomic Study of the Distance Between the Lower Margin of the Mandible and the Marginal Mandibular Branch of the Facial Nerve: A Systematic Review
Provedor de dados: 77
Autores: Aravena,Pedro Christian; Santibáñez,Rodrigo; Rubilar,Pablo; Espinoza,Christian; Pérez-Rojas,Francisco.
The marginal mandibular branch of the facial nerve (MMB) has a significant variation in relation to the lower border of the mandible (LBM). That is why it is important to know its topographical description to prevent damage in submandibular surgical procedures. The objective of this study was to determine the distance between the MMB and LBM based on descriptive studies carried out on human corpses and surgical patients. A systematic review of literature in MEDLINE, "Science Citation Index Expanded" of Web of Science (ISI) databases and manual search was performed. The articles with number of samples greater than or equal to 10 facial samples and recording of measurements between the MMB and the LBM or Gonion were selected. From the selected articles, the...
Tipo: Journal article
Palavras-chave: Anatomy and histology; Facial Nerve; Facial Nerve Injuries; Surgery; Oral; Head and Neck Neoplasms; Review Literature as Topic.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100052

Anatomic Study of the Right Coronary Artery in Pigs: Feature Review in Comparison with the Human Artery
Provedor de dados: 77
Autores: Gómez,F. A; Ballesteros,L. E.
A few studies conducted on the morphology of coronary arteries in pigs emphasize the description of its course and number of branches. The objective of this study was to determine the anatomic expression of the right coronary artery (RCA) in pigs of commercial stock. One hundred and fifty eight hearts obtained from pigs destined to sacrifice were studied. The RCA were perfused with polyester resin (Palatal 85% and Styrene 15%) and then subjected to KOH infusion for 5 minutes to release the subepicardial fat. Diameters were measured and courses were evaluated. Results: The diameter of the RCA in its proximal portion was 3.85 mm (SD 0.75). The right artery of the cone originated from the RCA in 100 specimens (63.3%) and from the aorta (third coronary) in 8...
Tipo: Journal article
Palavras-chave: Pig; Right coronary artery; Sinoatrial node branch; Right branch of the cone.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400023

Anatomic Variants of Foramen Ovale and Spinosum in Human Skulls
Provedor de dados: 77
Autores: Khan,Aaijaz Ahmed; Asari,Mohd Asnizam; Hassan,Asma.
Foramen ovale and spinosum are important foramina of the greater wing of the sphenoid. Normal variations in their shapes and sizes are quite common and widely studied. In the present study, conducted in the Department of Anatomy of School of Medical Sciences, Universiti Sains Malaysia, 25 dried human skulls were examined for anatomic variations of the foramina of the greater wing of the sphenoid. During the study, we noticed anatomic variations of the foramen ovale and spinosum. In one skull, there was an abnormally large and irregular foramen ovale which was confluent with the foramen spinosum. In the second skull, the foramen spinosum was absent on the left side and in the 3rd skull it was duplicated on the right side. These variations are very rare and...
Tipo: Journal article
Palavras-chave: Variation; Skull; Foramen; Sphenoid; Foramen ovale; Foramen spinosum.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200015

Anatomic Variations of Extrahepatic Bile Ducts and Evaluation of the Length of Ducts Composing the Cystohepatic Triangle
Provedor de dados: 77
Autores: Cachoeira,Eduardo; Rivas,Antonio; Gabrielli,Carla.
It is of paramount importance for surgeons to have a thorough knowledge of the normal anatomy of the extrahepatic bile ducts and its variations due to the high frequency with which they perform in this anatomic site. The cystohepatic triangle, or Calot's Triangle, is bound by the cystic duct, common hepatic duct, and the hepatic border; therefore, its surface area depends on the conformation of these ducts and is closely linked to surgical procedures performed in this region. It has been reported that the length and the position of these ducts may be related to the formation of bile duct stones, Mirizzi's syndrome, and bile duct cancer. Thus, the present work aims to analyze the configuration of the extrahepatic biliary tree and its possible variations, as...
Tipo: Journal article
Palavras-chave: Anatomy; Cystohepatic triangle; Common hepatic duct; Cystic duct; Cholecystectomy.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100050

Anatomic Variations of Sphenoid Sinus Pneumatization in a Sample of Turkish Population: MRI Study
Provedor de dados: 77
Autores: Sevinc,Ozdemir; Is,Merih; Barut,Cagatay; Erdogan,Aliriza.
There are a number of variations regarding morphometric anatomy and degree of pneumatization of the sphenoid sinus. In our study, we planned to examine and show the differences of pneumatization of the sphenoid sinus particularly to guide the neurosurgeon during transsphenoidal surgery. Sagittal T1-weighed spin-echo Magnetic Resonance Images (MRIs) of 616 adult individuals (406 women and 210 men) were analyzed, retrospectively. According to the collected data from our study, the most common type of the sphenoid sinus was the sellar type (83%; n=511) for the whole study group. Of the 616 individuals 16.6% (n=102) had presellar type and 0.5% (n=3) had conchal type of sphenoid sinus. Preoperative detailed detection of the anatomical characteristics of...
Tipo: Journal article
Palavras-chave: Paranasal sinus; Pneumatization; Sphenoid sinus; Transsphenoidal approach.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400003

Anatomical and Biometric Aspects of the Cutaneous Distribution of the Superficial Fibular Nerve
Provedor de dados: 77
Autores: Gabrielli,Carla; Froehner Junior,Ilário; Teixeira Braga,Maria Terezinha.
The objective of this research was to study the cutaneous branching of the superficial fibular nerve (SFN), with a topographic and biometric focus, aiming to provide further anatomical details for foot and ankle surgery in general. There were analyzed 30 right and left lower limbs of 15 corpses of male adult Brazilian individuals. The cutaneous branching of the nerve was dissected and measurements taken with a tape measure and digital caliper. The nerve emerged at the surface as a single trunk in 66.7% and divided into two branches in 33.3% of the cases. When a single trunk emerged, it appeared at the level of the third distal of the leg in 75%, at the boundary between the middle and distal thirds in 20%, and, in the middle third in 5%. When divided, in...
Tipo: Journal article
Palavras-chave: Anatomy; Leg; Foot; Nerves; Superficial fibular nerve.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200011

Anatomical and Clinical Considerations of the Pectoralis Tertius Muscle in Man
Provedor de dados: 77
Autores: del Sol,Mariano; Vásquez,Bélgica.
The anatomical variation of the major pectoral muscles is infrequent, namely the agenesis of the pectoralis major muscle due to the morpho-functional alterations it causes. On the other hand, he presence of -supernumerary - pectoral muscles is not common and its physiological, clinical or surgical importance will depend on the stage of its development. The important aspect is that these muscles, while crossing the anterior wall of the axila and inserting in the humerus, may confuse or difficult surgical access to the content of the axillary fossa. Pectoralis tertius muscles were found in two dissected cadavers at the Topographic Anatomy of the Faculty of Medicine of the Universidad de La Frontera, Chile. These muscles were bilateral and independent of the...
Tipo: Journal article
Palavras-chave: Pectoral tertius muscle; Human anatomy; Muscular variation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300014

Anatomical and Functional Description of the Radius of White Footed Tamarin (Saguinus leucopus)
Provedor de dados: 77
Autores: Duque Parra,Jorge Eduardo; Vélez García,Juan Fernando; Barco Ríos,John.
Saguinus leucopus is a neotropical primate, endemic and monotypic of Colombia (South America), with few studies of its anatomy, whose morphology radius this key element of this quadruped locomotion arboreal animal remains unknown. This study describes the gross functional anatomy of the radius bone of white-footed tamarin (Saguinus leucopus). The study was based on eight specimens fixed with 10% formalin and extracted their radius them, describing the main features of the bony prominences, such as muscle and ligaments attachments and neurovascular pipes. The radius of Saguinus leucopus bony presents some prominences for muscles and ligaments attachments, in addition to the synovial cartilage regions to other parts of the forelimb. The various anatomical...
Tipo: Journal article
Palavras-chave: Radius; Anatomy; Function; Primate; Saguinus; Morphology.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300027

Anatomical and Topographical Description of the Digestive System of Caiman crocodilus (Linnaeus 1758), Melanosuchus niger (Spix 1825) and Paleosuchus palpebrosus (Cuvier 1807)
Provedor de dados: 77
Autores: Romão,Mariluce Ferreira; Santos,André Luiz Quagliatto; Lima,Fabiano Campos; De Simone,Simone Salgueiro; Silva,Juliana Macedo Magnino; Hirano,Líria Queiroz; Vieira,Lucélia Gonçalves; Pinto,José Guilherme Souza.
This paper describes the digestive system of Caiman crocodilus, Melanosuchus niger and Paleosuchus palpebrosus based on anatomical and topographical inferences. The study involves two digestive systems of C. crocodilus, one of M. niger and one of P. palpebrosus, already fixed in 10% formaldehyde, belonging to the collection of the Wild Animal Research Laboratory (LAPAS) of the Federal University of Uberlândia. The work begins with a description of the digestive system of the aforementioned crocodilians, followed by topographical associations, aided by photographs taken with a SONY® DSC-H20 camera, X-rays of the gastrointestinal tract and a photograph of the digestive system of C. crocodilus prior to formaldehyding, which also belong to the LAPAS...
Tipo: Journal article
Palavras-chave: Anatomy; Alimentary canal; Jacaré paguá; Jacaré tinga; Jacaré açu.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100016

Anatomical Aspects of Permanent Geminate Superior Central Incisives
Provedor de dados: 77
Autores: Santos,Katia Simone Alves dos; Lins,Carla Cabral dos Santos Accioly; Almeida-Gomes,Fábio; Travassos,Rosana Maria Coelho; Santos,Roberto Alves dos.
The dental gemination is a morphological alteration that can occur during the development of the dental germ, resulting in a total or partial formation of two teeth which are not completely separate. The aim of this work was to relate an unusual case of gemination by the periapical radiography of superior central incisive in the permanent dentition.
Tipo: Journal article
Palavras-chave: Permanent dentition; Periapical radiography; Dental anomaly.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200035

ANATOMICAL ASPECTS OF THE PLACENTA OF THE SLOTH, Bradypus variegatus, SCHINZ, 1825
Provedor de dados: 77
Autores: Accioly Lins Amorim,Marleyne José Afonso; Amorim Júnior,Adelmar Afonso de; Messias,Júlio Brando; Silva Júnior,Valdemiro Amaro de; Melo Berinson,Karina de.
Sloth plows euterians mammals, belonging to the order Edentata, sub-order Xenarthra, infra-order Tardigrada, family Bradipodidae, which comprehend three specimen, Bradypus tridadctylus, Bradypus variegates and Bradypus torquatus. They plows few work found in the literature related to the anatomy of the placenta of this specimen. The material used in this research was consisted of 3 placentas of Bradypus variegatus of adult females (Briton, 1941) original of the Forests of the City of Recife and Zone of the Forest of the State of Pernambuco with average weight 4,2 Kg. Placentas were fixed in buffered glutaraldehyed 4%, pH 7,4, 0,1M and processed goes optical microscopy. Macroscopically was observed that the placenta of the sloth is composed of discoidal...
Tipo: Journal article
Palavras-chave: Placenta; Sloth; Anatomy; Bradypus variegatus.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000100002

ANATOMICAL ASPECTS OF THE PROXIMAL FEMUR OF ADULT BRAZILIANS
Provedor de dados: 77
Autores: Silva,Valter José da; Oda,Juliano Yasuo; Mello Gonçales Sant'Ana,Débora de.
This study had the purpose of enlarging the data on the Brazilian people, providing anatomic fundamentals that allow a better comprehension of clinical and pathological states involving the hip joint. Sixty-six human femurs, 33 right and 33 left, were used, coming from the Laboratory of Human Anatomy of the Universidade Paranaense &amp;shy; UNIPAR. All the bones had adult characteristics, but no sex, race or age identifications. None of them presented visible abnormalities or signs of arthrosis. The following morphometric measures were made: angle of the femur neck, circumference of the femur head and neck, length of the femur neck and of the whole bone. The comparative analysis of the angle of the femur neck between the right and left sides of adults...
Tipo: Journal article
Palavras-chave: Femur; Anatomy.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000400008

Anatomical Basis of the Myofascial Trigger Points of the Trapezius Muscle
Provedor de dados: 77
Autores: Akamatsu,Flávia Emi; Saleh,Samir; Pinesi,Henrique Trombini; Rodrigues,Katarina Reichmann; Zandoná,Cintia Benedicto; Andrade,Mauro; Jacomo,Alfredo Luiz.
This study aimed to bring the trapezius muscle, knowledge of the locations where the accessory nerve branches enter the muscle belly to reach the motor endplates and find myofascial trigger points (MTPs). Although anatomoclinical correlations represent a major feature of MTP, no previous reports describing the distribution of the accessory nerve branches and their anatomical relationship with MTP are found in the literature. Both trapezius muscles from twelve adult cadavers were carefully dissected by the authors (anatomy professors and medical graduate students) to observe the exact point where the branches of the spinal accessory nerve entered the muscle belly. Dissection was performed through stratigraphic layers to preserve the motor innervation of the...
Tipo: Journal article
Palavras-chave: Trigger points; Trapezius muscle; Anatomy; Nerves; Myofascial.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300023

Anatomical Behavior of the Celiacomesenteric Artery of Pirarucu Arapaima gigas Cuvier, 1817 (Osteoglossiforme, Arapaimidae)
Provedor de dados: 77
Autores: Santos,André Luiz Quagliatto; Brito,Fernando Moraes Machado; Bosso,Andrea Cristina Scarpa; Vieira,Lucelia Gonçalves; Silva Junior,Luiz Martins da; Kaminishi,Arthur Paulino Sanzo; Silva,Juliana Macedo Magnino; Pinto,José Guilherme Souza; Moura,Mariela Silva; Rosa,Marcelo de Alcántara.
The pirarucu, Arapaimidae family fish, is one of the most important and emblematic species of Amazon. To investigate their circulatory system anatomies features were used 10 specimens with 74 cm medium total length, from river Araguaia lakes, Sao Miguel do Araguaia, Goias, Brazil. The fishes had their celomatic cavity open with dorsal aorta artery identified and cannulation where was injected synthetic latex. Fixation of those specimens was by injection of 10% formalin. In that specie, the coeliac-mesenteric artery is the only one arterial vessel responsible to digestive tract flow and always ramified from 2nd, 3rd and 4th left efferent branchial arteries. The stomach is flowing by coeliac artery and a gastric branch of the cecal ventral artery; intestine...
Tipo: Journal article
Palavras-chave: Arapaima gigas; Arteries; Stomach; Intestine; Osteoglossiformes.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400003

Anatomical Characteristics of Deer and Sheep Lumbar Spines: Comparison to the Human Lumbar Spine
Provedor de dados: 77
Autores: Wang,Yang; Liu,Ting; Song,Liang-Song; Zhang,Zhi-Xin; Li,You-Qiong; Lu,Lai-Jin.
Deer and sheep spines are often used as models of the human spine. A prerequisite for the use of animal models is information regarding the interspecies differences in the parameters of general interest. This would clarify the limitations of each animal model and substantiate the applicability of the obtained results to humans. Since sufficient data appear to be currently unavailable, we sought to investigate the feasibility of using deer and sheep as animal models for studies on the human spine. The objective of this study was a thorough comparison of the anatomical parameters of deer and sheep spines with those of the human spine. We employed three-dimensional reconstructions of computed tomography images, generated using figure analysis software, which...
Tipo: Journal article
Palavras-chave: Spine; Animal model; Comparative anatomy; Sheep; Deer; Human.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100018

Anatomical Characteristics of Infra-Lamina Ridge in Chinese Population
Provedor de dados: 77
Autores: Li,Xiao-he; Cai,Yong-qiang; Wang,Xin; Gao,Shang; Li,Zhi-jun.
The aim of our study was to observe the occurrence rate and morphological characteristics of Infra-Lamina ridge (ILR) in Chinese population and provide a comprehensive reference for its clinical implication. Vertebrae columns of 82 sets of Chinese adult skeletons were collected. The shape of ILR was classified into three types; the occurrence of it in different sides and sexes were counted. The length, width, thickness of ILR were measured using a caliper with 0.02 mm accuracy. The ILR was usually found to occur from C7 to L5, with its frequency higher from T8 to 12, and highest at T10being up to 80.5%. There was significant statistical difference to the occurrence rate by side, sex and vertebral level. The largest values in its length and width were from...
Tipo: Journal article
Palavras-chave: Infra-lamina ridge; Vertebrae; Ossification; Ligamentum flavum; Morphological characteristics.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200034

Anatomical, Clinical and Radiographic Characteristics of Styloid Syndrome (Eagle Syndrome): a Case Report
Provedor de dados: 77
Autores: Buchaim,Rogério Leone; Buchaim,Daniela Vieira; Shinohara,André Luis; Rodrigues,Antonio de Castro; Andreo,Jesus Carlos; Ahmed,Farooque Jamaluddin.
Styloid syndrome is characterized by an elongated styloid process or calcification of the stylomandibular and stylohyoid ligament. This study describes a case of a 65-year-old woman who presented to the Stomatology Clinic, University of Marilia with temporomandibular joint pain, ear ringing and a reduced ability to open the mouth. Panoramic and posteroanterior digital radiographs showed bilateral elongation of the styloid processes, especially of the right side, whose length extended beyond the mandible angle. The diagnosis was confirmed with the association of clinical data and image examinations. The treatment options for styloid Syndrome include clinical follow-up, surgical removal of the styloid process or fracture of the elongated process. The case...
Tipo: Journal article
Palavras-chave: Eagle syndrome; Elongated styloid process syndrome; Temporal bone.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200057

Anatomical Description of the Liver, Hepatic Ligaments and Omenta in the Coypu (Myocastor coypus)
Provedor de dados: 77
Autores: Pérez,W; Lima,M.
The objective of this work is to give a complementary description of the hepatic lobulation, the hepatic ligaments and the omenta of the nutria. Thirty nutrias were studied by gross dissection. The liver of the nutria was divided into six lobules as follows: left lateral, left medial, quadrate, right medial, right lateral, and caudate lobes. The caudate lobe was divided into a papillary and a caudate process. A whole falciform ligament, extending as far as the navel, was found in all animals. This one was the only ligament that contained fat in between its sheets, and it was abundant in the umbilical part. The left triangular ligament had two parts. One of them was attached to the left lateral lobe of the liver and the other one to the left medial lobe....
Tipo: Journal article
Palavras-chave: Anatomy; Liver; Hepatic ligaments; Omenta.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100007

Anatomical Dissection: A Positive Experiencen for Venezuelan First Year Medical Students
Provedor de dados: 77
Autores: Romero Reverón,Rafael.
An anonymous survey was handed out to 616 first year medical students of the José María Vargas School of Medicine of the Central University of Venezuela during the six academic years from 2002 and 2008, so that they answer it voluntarily after a cadaver dissection session, after the first unit of the practice syllabus of Gross Anatomy I had completed. The results of these surveys delivered to first year medical students report a positive response to their initial experience with a cadaver in the anatomical dissection room. In fact, the students described this initial experience as positive in a 52.22 %, while 34,25 % referred to it as very positive, 7.14 % as stressing and only a 1.13 % rated it as traumatic. In the case of only 13.63 % of these students...
Tipo: Journal article
Palavras-chave: Anatomical dissection; Initial experience in the anatomical dissection room; Human anatomy; Cadaver.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100031

Anatomical Examination of the Foramens of the Middle Cranial Fossa
Provedor de dados: 77
Autores: Unver Dogan,Nadire; Fazliogullari,Zeliha; Uysal,Ismihan Ilknur; Seker,Muzaffer; Karabulut,Ahmet Kagan.
Three foramina can be identified in the greater wing of the sphenoid bone: The foramen rotundum (FR), foramen ovale (FO) and foramen spinosum (FS). In addition, there may be another foramen called foramen ovale accessorium or foramen vesalius (FV) which connects the middle cranial fossa to the fossa pterygoidea (pterygoid fossa). It is described as an opening with smooth walls in front and medial to foramen ovale which leads to an oblique channel directed towards the fossa pterygoidea. FV was present between FO and FR in 14 (31.8%) of 44 dry and 6 (33.3%) of 18 cadaver skullbase sides (total 20 (32.3%) of 62). The diameter values of foramens on both the right and the left side were observed to be almost symmetrical. FR's distance from the midline on the...
Tipo: Journal article
Palavras-chave: Foramen rotundum; Foramen ovale; Foramen spinosum; Foramen Vesalius.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100008

Anatomical Factors/Countermeasures in/against Iatrogenic Injury of the Deep Branch of Radial Nerve in the Thompson Approach Via Middle and Proximal Segments of Forearm
Provedor de dados: 77
Autores: Shan,Jianlin; Wang,Chongwei; Ren,Dajiang; Jiang,Heng.
This study aimed to investigate the anatomical factors affecting iatrogenic injury of the deep branch of radial nerve during the Thompson approach and to propose corresponding countermeasures. Thompson approach was used to measure the horizontal/longitudinal distance from the position where the deep branch of radial nerve leaves the supinator to the ulnar margin of extensor carpi radialis brevis/humeroradial joint line. Measurements were obtained by using 48 adult cadaver specimens, which were used in teaching. We observed the lentor situation of the extensor digitorum and extensor carpi radialis brevis in proximal forearm segments and measured the distance from the deep branch of radial nerve to the humeroradial joint line at the lateral side of the...
Tipo: Journal article
Palavras-chave: Thompson approach; Deep branch of radial nerve; Anatomy.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100016

Anatomical Indicators of Dominance between the Coronary Arteries of Dogs
Provedor de dados: 77
Autores: Oliveira,Carla Lívia Santos de; David,Gustavo Serra; Carvalho,Michelly de Oliveira; Dornelas,; Araújo,Sandra; da Silva,Nailton Cavalcante; Ruiz,Cristiane Regina; Fernandes,Juliana Ruiz; Wafae,Nader.
In humans, the right coronary artery is dominant. However, we did not find any citations in the literature concerning anatomical indicators of dominance among dogs. We used 30 hearts from mongrels of both sexes, fixed in 10% formalin. The branches of the coronary arteries were dissected with special attention to the levels that were considered to be reference points. In 96.7%, the circumflex branch of the left coronary artery reached or went beyond the crux cordis. The subsinuosus interventricular artery, ended before reaching the apex in 21 cases, at the apex in five cases and after the apex in four cases. The paraconal interventricular artery, ended before reaching the apex in two cases, at the apex in 11 cases and after the apex in 17 cases. The region...
Tipo: Journal article
Palavras-chave: Morphology; Dog hearts; Circulation; Coronary arteries.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300030

Anatomical Parameters of the Rectus Capitis Posterior Minor Muscle Based on a New Magnetic Resonance Scan Method
Provedor de dados: 77
Autores: Xu,Qiang; Liu,Cong; Yuan,Xiao-Ying; Chi,Yan-Yan; Li,Yun-Fei; Zhang,Jian-Fei; Sui,Hong-Jin; Han,Seung-Ho; Yu,Sheng-Bo; Lin,Xiang-Tao.
The past findings confirm that the Rectus Capitis Posterior minor (RCPmi) is connected to the cervical spinal dura mater via the Myodural Bridge (MDB) through the posterior antlanto-occipital interspace. It is hypothesized to perform some functions. Furthermore, some clinical studies found that the pathology of RCPmi might be related to chronic headaches. But few studies were related to the morphological parameters of the RCPmi. It would be conducive to performing clinical researches on the RCPmi and MDB. To explore the optimal section for measuring the RCPmi by MRI and provide imaging anatomy parameters of the RCPmi for clinical research. The RCPmi was measured in the dissection of 10 formalin-fixed cadaver specimens. The morphological parameters of the...
Tipo: Journal article
Palavras-chave: Suboccipital region; Rectus capitis posterior minor muscle (RCPmi); Imaging anatomy parameters.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300032

Anatomical, physiological and chemical differences between populations of Pseudocyphellaria flavicans (Hook. f. &amp;amp; Taylor) Vain. from Chile
Provedor de dados: 73
Autores: ATALA,CRISTIAN; SCHNEIDER,CARLOS; BRAVO,GABRIEL; QUILODRÁN,MANUEL; VARGAS,REINALDO.
Environmental conditions can affect lichen morphology, physiology and chemistry. Some functional traits; like thickness of thallus layers, photosystems condition, and presence of photoprotective and antioxidant compounds are key to colonizing new sites, and can change depending on light and moisture availability. In the present study, we compared the morphology, physiology and chemistry of the native Chilean lichen Pseudocyphellaria flavicans from two Coastal populations (Nahuelbuta and Contulmo, Araucanía district), and one Andean population (Ralco, Bío-Bío district). Ralco is a more closed secondary forest, and can show dryer periods compared to Nahuelbuta and Contulmo. We found differences in thalli anatomy between populations. Ralco individuals had...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100003

ANATOMICAL RELATIONSHIP BETWEEN VERTEBRAL ARTERIES AND CERVICAL VERTEBRAE: A COMPUTERIZED TOMOGRAPHY STUDY
Provedor de dados: 77
Autores: Gonçalves Martins,Johnny Wesley; Pratesi,Riccardo; China Bezerra,Armando José.
Vertebral arteries ascend lateral to the cervical spine. Although non-contrasting tomographic studies have attempted to determine the anatomical relationship between these arteries and the spine, the presence and position of the former have yet to be clearly demonstrated. This study was thus aimed to determine the position of the vertebral arteries in relation to the midline, anterior and posterior planes of the vertebral body of each cervical vertebrae. Twenty six adult patients, without lesions that could distort normal anatomy, were employed as subjects and 52 vertebral arteries were analyzed. Two-dimensional computerized tomographies scans were conducted following the injection of an intra-venous contrast. Statistical analyses evaluated the differences...
Tipo: Journal article
Palavras-chave: Vertebral artery; Sinal column; Computerized tomography.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000200005

Anatomical Reproducibility through 3D Printing in Cranio-Maxillo-Facial Defects
Provedor de dados: 77
Autores: de Moraes,Paulo Hemerson; Olate,Sergio; Cantín,Mario; Assis,Adriano Freitas; Santos,Edson; Silva,Filipe de Oliveira; Silva,Lucas de Oliveira.
The planning and 3D reconstruction in craniofacial defects based on anatomical principles of symmetry and passive adaptation has evolved radically the past few years. This article recounts the possibility to develop personalized and extensive craniofacial implants. We present a case of a patient with a 10-year trauma sequel evolution; the patient lost the right frontal bone, supraorbital wall and part of the temporal fossa. From the computerized tomography, and by using Materialise software (3-Matic and Mimics). Subsequently, the printing was performed using the virtual planning with a laser printer in titanium where the piece was elaborated with the determined specifications in the planning; surgery was performed without complications in which the implant...
Tipo: Journal article
Palavras-chave: 3D printing; Selective laser melting; Facial implant.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300003

Anatomical root variations in response to water deficit: wild and domesticated common bean (Phaseolus vulgaris L)
Provedor de dados: 48
Autores: Peña-Valdivia,Cecilia B; Sánchez-Urdaneta,Adriana B; Meza Rangel,Joel; Juárez Muñoz,Juana; García-Nava,Rodolfo; Celis Velázquez,Raquel.
Root anatomical responses to water deficit are diverse and regulation of water uptake strongly depends on plant anatomy. The ancestors of common bean (Phaseolus vulgaris L.) cultivars are the wild common beans. Because wild beans adapt and survive well in theon atural environment, it is hypothesized that wild common bean roots are less affected than those of domesticated beans at low substrate water potential (&amp;#968;W). A wild common bean accession from Chihuahua Mexico and cv. Bayomex were studied. Seedlings with a mean root length between 3 and 4 cm were maintained for 24 h in vermiculite at &amp;#968;W of -0.03 (well hydrated), -0.65, -1.48 and -2.35 MPa (partially dry). Ten anatomical characteristics of differentiation and cell division in root...
Tipo: Journal article
Palavras-chave: Endodermis; Protoderm; Seedlings; Water potential; Xylem.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000400006

Anatomical Snuffbox and it Clinical Significance: A Literature Review
Provedor de dados: 77
Autores: Cerda,Aladino; del Sol,Mariano.
The anatomical snuffbox is a small triangular area situated in the radial part of the wrist, often used to perform clinical and surgical procedures. Despite the frequency with which this area is used, there is scarce information in literature about its details. The objective of this study is detailed knowledge of the anatomical snuffbox's anatomy and its components, the reported alterations at this portion, besides the clinical uses and significance of this area.
Tipo: Journal article
Palavras-chave: Hand; Wrist; Anatomical Snuffbox; Radial artery; Cephalic vein; Superficial branch of radial nerve; Scaphoid.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400027

Anatomical Study of Position of the Rib Head for Placing Anterior Vertebral Body Screws in a Chinese Population
Provedor de dados: 77
Autores: Li,X. H; Xu,D. C; Li,Z. J; Wang,X.
Instrumentation of anterior vertebral body screws has become an important approach for treatment of unstable fracture or curvature of the spine, but little attention has been paid to the starting point of placing the screws and variability of the rib head position. We analyzed the variability of rib head position in a Chinese population in terms of the spinal canal and vertebral body using computed tomography (CT). Images from transverse CT scan of the T4-T12 vertebral bodies of 30 normal individuals were 3D reconstructed, and analyzed for measurement of parameters, which included: 1) distance between the left (or right) anterior border of the rib head and the posterior (or anterior) margin of the vertebral body [L(R )ARHP(A)VB], 2) left (or right)...
Tipo: Journal article
Palavras-chave: Anterior thoracic instrumentation; Rib head; Vertebral body; Screw position; Vertebral anatomy.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200027

ANATOMICAL STUDY OF THE ABDOMINAL AORTA SACRAL RAMI OF THE OPOSSUM (Didelphis albiventris)
Provedor de dados: 77
Autores: Carvalho Pinto e Silva,José Ricardo de; Fernandes Boaro Martins,Márcia Regina.
The objective of this study was to describe the anatomy of the opossum abdominal aorta sacral rami, emphasizing the common iliac arteries, external and internal iliac arteries and the middle sacral artery. Ten animals Didelphis albiventris from the Department of Anatomy, Instituto de Biociências &amp;shy; UNESP Botucatu, were used. After laparotomy, the aorta and its terminal rami were seen, dissected under microscopy and photographed. The abdominal aorta emitted rami, forming the right and the left common iliac arteries that divided, originating the external and internal iliac arteries. The middle sacral artery presented in 30% of cases now caudally rising from the right common iliac artery, then from the left one (30%) or in most cases (40%), as a...
Tipo: Journal article
Palavras-chave: Anatomy; Opossum; Aorta.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000300007

Anatomical Study of the Digastric Muscle: Variations in the Anterior Belly
Provedor de dados: 77
Autores: Liquidate,Bianca Maria; Barros,Mirna Duarte; Alves,Adriana Leal; Pereira,Celina Siqueira Barbosa.
The digastric muscle is formed by two muscle bellies: one anterior and one posterior, joined by an intermediate tendon. It is localized in the anterior cervical region. The anterior belly divides the region between the hyoid bone and the mandible into two: laterally the submandibular triangle, and medially the submental triangle. The anatomical variations described in the literature relate to the anterior belly and consist of differences in shape and muscle attachment. This cross-sectional cohort study had the objective of describing anatomical variations in the anterior belly of the digastric muscle. The neck regions of 10 cadavers of male adults were dissected in the Department of Morphology, between June 2004 and June 2006. The digastric muscles that...
Tipo: Journal article
Palavras-chave: Neck muscles; Anatomy; Hyoid bone.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400018

Anatomical Study of the Fibularis Longus Muscle Motor Points and Electrical Stimulation Therapy Application
Provedor de dados: 77
Autores: Méndez Rebolledo,Guillermo; Coronado Gallardo,Roberto; Suazo Galdames,Iván.
The fibularis longus muscle (FLM) has an important role in the movement of eversion of the foot and in maintaining the plantar arch. The electrostimulation procedures seek to maintain muscle trophism, increase strength and endurance, and are frequently used in physiotherapy, for which the clinician needs to know the location of the motor points of the FLM. Therefore, the purpose of this study was to determine the number and distribution of motor points of the FLM and relate them to observable parameters in the surface anatomy. Ten formalin-preserved limbs were used, and the lateral regions of the leg were dissected in detail. In all the cases, the muscle presented three fascicular patterns, the superior and anteroinferior fascicles presented two motor...
Tipo: Journal article
Palavras-chave: Fibularis longus muscle; Superficial fibular nerve; Motor Point; Electrostimulation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300012

Anatomical Study of the Horseshoe Kidney
Provedor de dados: 77
Autores: Tijerina de la Garza,Octavio; Uresti,Jaime; Urrutia de la Vega,Edgar; Elizondo-Omaña,Rodrigo Enrique; Guzmán-López,Santos.
We present the anatomical study of a horseshoe kidney found during dissection practice at the human anatomy laboratory. The specimen consisted of a renal mass joined at its lower poles by an isthmus composed of renal parenchyma. We provide a macroscopic description of renal blood supply and the excretory system. We also discuss the anatomic and embryologic importance of this anomaly.
Tipo: Journal article
Palavras-chave: Horseshoe kidney; Macroscopic description; Anatomic anomaly.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200030

Anatomical Study of the Pterygospinous and Pterygoalar Bony Bridges and Foramens in Dried Crania and its Clinical Relevance
Provedor de dados: 77
Autores: Suazo Galdames,Iván; Zavando Matamala,Daniela; Smith,Ricardo Luiz.
The ossification of the intrinsic ligaments of the sphenoid bone has been reported in the literature. The presence of bony bridges by ossification of the pterygospinous and pterygoalar ligaments has clinical significance in the infratemporal fossa contents. The purpose of this study is to analyze the prevalence of ossification of these ligaments and assess morphometrically the pterygospinous (Civinini's) and pterygoalar (crotaphitico-buccinatorius) foramens. A total of 312 human skulls from the collection of Universidade Federal de São Paulo (UNIFESP) were used to assess the presence of total or partial ossification in pterygospinous (Types I and II) and pterygoalar (Types III and IV) ligaments. Of the sample, 37.18% had some degree of ossification; in...
Tipo: Journal article
Palavras-chave: Pterygospinous ligament; Pterygoalar ligament; Infratemporal fossa; Foramen ovale; Porus crotaphitico-buccinatorius.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200012

Anatomical Study on Domestical Fowl (Gallus domesticus) Reproductive System
Provedor de dados: 77
Autores: Bull,Marilena Longo; Martins,Márcia Regina Fernandas Boaro; Dalva Cesário,Maria; Padovani,Carlos Roberto; Mendes,Ariel Antonio.
Lately, researchers have taken into consideration studies on birds since they represent an excellent nutritional source. There are several classical descriptions of the male reproductive tract, always aiming at establishing a correlation with shape, testicular size, age and sexual maturity. This study analyzed 50 male Gallus domesticus, 1 to 64 weeks old. The birds were collected with 10 days and then weekly until 24 weeks, following 37, 48, 59 and 64 weeks, and sacrificed by cervical displacement. It was observed the sintopies of testis with the other organs. Further, it was done the testicular measurement and then the statistical analysis by following the model of testis weight variation due to the animal age. Our results showed that the maximum weight...
Tipo: Journal article
Palavras-chave: Anatomy; Testis; Fowl.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400007

Anatomical Study on the Descent of Testis in Prenatal Goat (Capra hircus)
Provedor de dados: 77
Autores: Farooqui,M. M; Archana,Chandrapal; Prakash,Ajay.
A study was conducted on 70 embryo/ foetii of goats to observe the descent of testis. These foetii were grouped into I (0-30 days), II (31-60 days), III (61-90 days), IV (91-120days) and V (121 days up to term, having 14 embryos/ foetii in each group. The genital ridge was observed at 1.2cm CRL (23 day) on the ventromedial aspect of mesonephros. At 42nd day, the genital ridge developed into cylindrical structure, the testis, located in the middle of metanephros. The abdominal migration was completed upto 88th day. The testes were situated in the inguinal canal from 89th to 95th day. From 90th day onward, scrotal migration had been observed, however the testis did not reach the base of the scrotum up to term. During the descent of testis, a peritoneal fold...
Tipo: Journal article
Palavras-chave: Anatomy; Testis; Gubernaculum; Goat.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200002

Anatomical Study on the Psoas Minor Muscle in Human Fetuses
Provedor de dados: 77
Autores: Guerra,Danilo Ribeiro; Reis,Francisco Prado; Bastos,Afrânio de Andrade; Brito,Ciro José; Silva,Roberto Jerônimo dos Santos; Aragão,José Aderval.
The anatomy of the psoas minor muscle in human beings has frequently been correlated with ethnic and racial characteristics. The present study had the aim of investigating the anatomy of the psoas minor, by observing its occurrence, distal insertion points, relationship with the psoas major muscle and the relationship between its tendon and muscle portions. Twenty-two human fetuses were used (eleven of each gender), fixed in 10% formol solution that had been perfused through the umbilical artery. The psoas minor muscle was found in eight male fetuses: seven bilaterally and one unilaterally, in the right hemicorpus. Five female fetuses presented the psoas minor muscle: three bilaterally and two unilaterally, one in the right and one in the left hemicorpus....
Tipo: Journal article
Palavras-chave: Psoas Muscles; Muscle; Skeletal; Anatomy; Gender Identity.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100024

Anatomical Variants of Anterior Cerebral Arterial Circle: A Study by Multidetector Computerized 3D Tomographic Angiography
Provedor de dados: 77
Autores: Jiménez-Sosa,Michelle Stephanie; Cantu-Gonzalez,Juan Ramón; Morales-Avalos,Rodolfo; de la Garza-Castro,Oscar; Quiroga-Garza,Alejandro; Pinales-Razo,Ricardo; Elizondo-Riojas,Guillermo; Elizondo-Omaña,Rodrigo E; Guzmán- López,Santos.
One of the most common causes of stroke is rupture of aneurysms whose approach requires knowledge of anatomical variants. The aim of this study was to determine the prevalence of anatomical variants of the anterior cerebral artery (ACA) and the anterior communicating artery (AComA) by 3D computed tomography angiography (3D CTA) in Mexican individuals. A retrospective, observational, cross-sectional descriptive study of 283 patients, independent of sex or age, in which morphometric measurements of cerebral vessels were evaluated using contrasted 3D CTA from a period of two years was performed. We found at least one "atypical" variant in a third of the study population (33.93 %). The most common "atypical" variant was the absence of the AComA (14.1 %). A...
Tipo: Journal article
Palavras-chave: Anterior cerebral artery; Anatomical variant; Anterior communicating artery; Cerebral arterial circle; Subarachnoid hemorrhage; Cerebral endovascular surgery.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300049

Anatomical Variation of the Brachiocephalic Trunk and Common Carotid Artery in Neck Dissection
Provedor de dados: 77
Autores: Iterezote,Ana Maria; Medeiros,Alisson Dantas de; Barbosa Filho,Rômulo César Costa; Petrella,Selma; Andrade Junior,Luiz Carlos de; Marques,Sergio Ricardo; Prates,José Carlos.
Variations in the trajectory of the brachiocephalic trunk and the common carotid artery predispose to disorders which might be critical in a tracheotomy and/or surgeries. Dissection of 110 formol fixed adult cadavers, both sexes, were performed to increase the anatomic knowledge of the neck vessels and its variations. Cadavers were from the Laboratory of Descriptive and Topographic Anatomy of the Federal University of São Paulo- Paulista Medical School- UNIFESP-EPM. In 109 of these cadavers no variations were found while in one (0.9 %) it was possible to observe a variation in the trajectory of the brachiocephalic trunk and in the right common carotid artery.
Tipo: Journal article
Palavras-chave: Brachiocephalic trunk; Common carotid artery; Variation; Anatomy.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200046

Anatomical Variations of the Azygos Venous System: Classification and Clinical Relevance
Provedor de dados: 77
Autores: Dahran,Naief; Soames,Roger.
The azygos venous system is highly variable in terms of its origin, course, communications, tributaries and termination of the associated veins: this study aimed to classify these anatomical variations. Thirty Thiel-embalmed cadavers aged 48­98 years (18 female, 12 male) were examined. The vertebral level of termination and diameter of the azygos, hemiazygos, accessory hemiazygos and the left superior intercostal veins were determined, as well as the termination level of the right superior intercostal vein. The azygos system was classified into 3 types; primitive (type 1), transitional (type 2) and unicolumnar (type 3). Type 2 was further divided into 5 subgroups (A to E) according to the number of retroaortic communications. Type one was observed in 3 %...
Tipo: Journal article
Palavras-chave: Azygos; Hemiazygos; Retroaortic communications; Thiel-embalmed cadavers; Variations.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300051

Anatomical Variations of the Foramen Transversarium in Cervical Vertebrae
Provedor de dados: 77
Autores: Molinet Guerra,Marcia; Robles Fuentes,Patricio; Roa,Ignacio.
The cervical vertebrae are recognized mainly by the presence of the foramen transversarium, which is crossed by the vertebral artery and vein, accompanied by sympathetic fibers. The main objective of this study was to observe and describe the anatomy and variations in the foramen transversarium. 121 cervical vertebrae were analyzed, including the macroscopic characteristics, shape and diameter and presence of the foramen transversarium, as well as the accessory foramen transversarium. All cervical vertebrae presented the foramen transversarium, with a mean diameter of 5.60 mm and a mean diameter of 4.40 mm on the right and 5.92 mm - 5.56 mm on the left, respectively. With regard to shape classification according to Taitz et al. (1978), 90.08 % presented...
Tipo: Journal article
Palavras-chave: Cervical vertebra; Foramen transversarium; Accessory foramen; Vertebral artery.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200053

Anatomical Variations of the Frontal Sinus
Provedor de dados: 77
Autores: Pondé,José Marcos; Nonato Andrade,Raimundo; Maldonado Via,José; Metzger,Patick; Teles,Ana Clara.
An anatomical study of the frontal sinus in 100 macerated skulls. The study introduces an innovation on the literature by means of the measurement of the sinus's volume. All the found information in the literature attained to other aspects including the diameters of the sinus and the geometric área of the same. Objective: Evaluation of the measures of the frontal sinus frequently involved in cranial base surgeries and supraorbital craniotomies in order to help the surgical approaches that cross this anatomical route Methods: The measurement included: sagital, transverse and an tero-posterior diameter acquired with a paquimeter and the volume obtained after filling the sinus with sand. Results: They are in accordance with the literature that shows the...
Tipo: Journal article
Palavras-chave: Frontal sinus; Supraorbital craniotomy; Paranasal sinus.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400003

Anatomicis Network: Una Plataforma de Software Educativa basada en la Nube para Mejorar la Enseñanza de la Anatomía en la Educación Médica
Provedor de dados: 77
Autores: Inzunza,Oscar; Neyem,Andrés; Sanz,María Eliana; Valdivia,Iván; Villarroel,Mauricio; Farfán,Emilio; Matte,Andrés; López-Juri,Patricio.
En este artículo, se describe una propuesta novedosa de plataforma de software educativa para mejorar la enseñanza de la anatomía en la educación médica. Con el fin de determinar la utilidad y el impacto de esta plataforma, se desarrollo una experiencia inter institucional entre los años 2016 y 2017, el cual involucró a las Universidades de Antofagasta, Playa Ancha, Austral y Católica de Chile. Los departamentos de anatomía que participaron en esta experiencia utilizaron la plataforma de software educativa para acceder a imágenes anatómicas 2D y 3D, videos y evaluaciones teórico prácticas multimodales en línea, pudiendo realizar con sus estudiantes pruebas de usabilidad. Este proyecto pretende aportar a la enseñanza de la anatomía en los diferentes...
Tipo: Journal article
Palavras-chave: Plataforma web; Anatomía Humana; Innovación.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300056

Anatomy and Functional Architecture of the Anconeus Muscle
Provedor de dados: 77
Autores: Coriolano,M. G. W. S; Lins,O. G; Amorim,M. J. A. A. L; Amorim,A. A. Jr.
The anconeus is a small muscle situated at the elbow. Although the anconeus is active during elbow extension its importance for the movement is probably small. It could work as an elbow stabilizer. The object of this study was to investigate some anatomic and architectural characteristics of the anconeus, in the hope of shedding light on its function. We studied twenty adult cadaveric specimens. The anconeus originates by the lateral epicondyle of the humerus and inserts along the proximal ulna. The superficial shape of the anconeus is triangular. Tridimensionally the anconeus resembles a hemisected rectangular-based pyramid, with the base at the ulna and apex at the lateral epicondyle. The muscle fibers arise obliquely from the tendinous expansion and...
Tipo: Journal article
Palavras-chave: Anconeus muscle; Muscle architecture; Function of the anconeus.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400008

Anatomy and Histophysiological Changes in Pituitary of Calotes versicolor During Breeding and Nonbreeding Seasons
Provedor de dados: 77
Autores: Malashetty,Vijaykumar B; Sonar,A; Patil,Saraswati B.
Calotes versicolor, collected during peak breeding and nonbreeding season were used for the study of anatomy and histophysiology of pituitary gland. In C. versicolor the pituitary gland is small compact mass attached to the hypothalamus by a delicate stalk. It is of two basic units, adenohypophysis and neurohypophysis. The adenohypophysis includes pars distalis (PD) and pars intermedia (PI). The pars tuberalis (PT) which is usually reduced in reptiles, is absent in C. versicolor. The neurohypophysis is composed of median eminence (MI) and neural lobe or pars nervosa (PN). The anterior PD is rich acidophils than the posterior PD during breeding season. These cells are differentiated as A1 and A2 cells. The A1 cells are erythrosinophilic and stained purple...
Tipo: Journal article
Palavras-chave: Calotes versicolor; Pituitary; Pars distalis; Pars intermedia; Pars tuberalis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400042

Anatomy and Variations of the Celiac Trunk
Provedor de dados: 77
Autores: Petrella,Selma; Rodriguez,Celio Fernando de Sousa; Sgrott,Emerson Alexandre; Fernandes,Geraldo José Medeiros; Marques,Sergio Ricardo; Prates,José Carlos.
The aim of this study was to analyze anatomy of the celiac trunk through its diameter, length, emission and variation of its branches. Sixty-nine cadavers fixed in 10% formalin solution were dissected in the anatomy laboratories of the Federal University of Sao Paulo (UNIFESP/EPM), Lusiadas of Santos University (UNILUS) and Santo Amaro University (UNISA) and 20 non-fixed cadavers from Death Verification Services, of the Sao Paulo University (USP) and Federal University of Sao Paulo (UNIFESP/EPM). Dissection of the trunk celiac of these cadavers was performed after opening of the peritoneal cavity. The obtained results allowed us to conclude the following: 1) Mensuration of the length from the celiac trunk up to its first branch, the left gastric and/or...
Tipo: Journal article
Palavras-chave: Anatomy; Celiac trunk; Anatomical variations.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200002

Anatomy Basis and Clinical Significance of Various Types of Abductor Hallucis Superior Margin Arterial Arcades
Provedor de dados: 77
Autores: Tan,Wei; Huang,Wen-hua; Li,Xu; Liu,Ke.
The aim of this study was to group arteries of arterial arch at the superior margin of the abductor hallucis muscle according to their constitutes and provide anatomical basis for reverse bifolicated flap based on it. The constitute, track-way and distribution of the artery, which supply the medial pedis flap, the medial plantar and the medial tarsal flap, especial the arterial arch at the superior margin of the abductor hallucis muscle were observed and analyzed on 81 lower limbs cast specimens and 2 fresh feet specimens. According to their constitute, arterial arch at the superior margin of the abductor hallucis muscle can be classified into 3 types: i) type I, It was constituted mainly by the branch of anterior medial malleolus artery and (or) the...
Tipo: Journal article
Palavras-chave: Abductor hallucis muscle; Arterial arch; Anterior medial malleolus artery; Medial tarsal artery; Superficial branch of the medial plantar artery; Blood vessel grouping.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300016

Anatomy of corpus callosum in prenatally malnourished rats
Provedor de dados: 48
Autores: Olivares,Ricardo; Morgan,Carlos; Pérez,Hernán; Hernández,Alejandro; Aboitiz,Francisco; Soto-Moyano,Rubén; Gil,Julio; Ortiz,Alexis; Flores,Osvaldo; Gimeno,Miguel; Laborda,Jesús.
The effect of prenatal malnutrition on the anatomy of the corpus callosum was assessed in adult rats (45-52 days old). In the prenatally malnourished animals we observed a significant reduction of the corpus callosum total area, partial areas, and perimeter, as compared with normal animals. In addition, the splenium of corpus callosum (posterior fifth) showed a significant decrease of fiber diameters in the myelinated fibers without changing density. There was also a significant decrease in diameter and a significant increase in density of unmyelinated fibers. Measurements of perimeter's fractal dimensions from sagittal sections of the brain and corpus callosum did not show significant differences between malnourished and control animals. These findings...
Tipo: Journal article
Palavras-chave: Corpus callosum; Prenatal malnutrition; Rat; Splenium.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000100012

Anatomy of Deltoid Flap Based on Posterior Subcutaneous Deltoid Artery: A Cadaveric Investigation
Provedor de dados: 77
Autores: Edizer,M; Tayfur,V; Magden,A. O; Atabey,A; Gocmen-Mas,N; Aksu,F; Karabekir,S.
The purpose of the study is to evaluate neurovascular anatomy of the deltoid flap based on the posterior subcutaneous deltoid artery (PSDA). Bilateral axillary artery dissections of the thirty-four shoulders of 17 formalin-fixed cadavers were performed (15 male, 2 female; age range 40 to 82 years) under the 4x loupe magnification. During the dissection of each region, the PSDA was evaluated with respect to the origin, the branches, course and anatomical relations with neighbouring structures. The PSDA was present in all cases. The PSDA was single in 26 (76.5%) cases, double in 2 (5.9%) cases and had early bifurcation in 6 (17.6%) cases. The mean length of the lateral cutaneous brachial nerve was 6.0 mm range from 49.0 mm to 83.9 mm. The mean distance...
Tipo: Journal article
Palavras-chave: Deltoid flap; Reconstruction; Posterior circumflex humeral artery; Posterior subcutaneous deltoid artery.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200003

Anatomy of Left Atrioventricular Valve (Mitral Valve) Leaflets in Adult Indian Cadavers
Provedor de dados: 77
Autores: Deopujari,R; Sinha,U; Athavale,S. A.
The atrioventricular valve is the most commonly repaired valve of the heart. Interventional procedures like annuloplasties, valvotomy/valvuloplasty, repair/replacement of the valve for regurgitation or prolapse are increasing by the day. This necessitates a clear understanding of the mitral valve anatomy. The present study is an attempt to revisit the anatomy of mitral valve. The present study was conducted on 34 adult embalmed heart specimens. Based on the newly defined criteria, observations were made on: 1) Number of commissures and their positions, 2) Number and position of leaflets, 3) Number and position of minor commissures, 4) Annular circumference (AC), 5) Length of annular attachment of each leaflet (LAA), 6) Maximum width of coapted/ folded...
Tipo: Journal article
Palavras-chave: Annular circumference; Major commissures; Minor commissures.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400021

Anatomy of Lumbar Interspinous Ligaments: Attachment, Thickness, Fibre Orientation and Biomechanical Importance
Provedor de dados: 77
Autores: Mahato,Niladri Kumar.
Literature related to the study of interspinous ligament in the lumbar region is sparse. Very few studies have elucidated the fibre orientation of this ligament at different lumbar levels. Male (19) and female (6) cadavers were dissected to expose the interspinous ligaments beneath all the lumbar vertebrae. Fibre attachments and directions were observed at all lumbar interspinous spaces. Thicknesses of the ligaments were measured at all levels. Interspinous ligament fibres were found to be oriented differently in the lumbar inter-spinous spaces. In the upper spaces the fibres were more horizontal. In the spaces beneath L3 and L4, fibres were curved and extended postero-superiorly. Fibres were thicker in the ligaments at the lower spaces in comparison to...
Tipo: Journal article
Palavras-chave: Lumbar flexion; Spinous process; Supraspinous ligament.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100054

Anatomy of Posterior Antebrachial Cutaneous Nerve Related to the Lateral Epicondyle and Interepicondylar Line
Provedor de dados: 77
Autores: Chodewaratham,Pathidta; Chentanez,Vilai; Agthong,Sithiporn; Huanmanop,Thanasil.
Posterior antebrachial cutaneous nerve (PACN) is a branch of radial nerve supplying the skin of posterior forearm. Data regarding its anatomy remain insufficient especially the origin and number of branches. We dissected 101 upper extremities from 32 male and 20 female cadavers to expose the PACN. In all specimens, the nerve emerged from the deep fascia at the hiatus proximal to the interepicondylar line (IEL) with mean distances of 7.24 and 7.44 cm in males and females, respectively. Percentage of this distance to the arm length was 23.2 % and 26.1 % in males and females, respectively. After penetrating the deep fascia, the PACN coursed in the subcutaneous layer and crossed the IEL anterior to the lateral epicondyle (LE) in all cases. The mean distances...
Tipo: Journal article
Palavras-chave: Posterior antebrachial cutaneous nerve; Lateral epicondyle; Interepicondylar line; Anatomy.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300023

Anatomy of the Facial Nerve and its Implication in the Surgical Procedures
Provedor de dados: 77
Autores: Rodrigues,Antonio de Castro; Andreo,Jesus Carlos; Menezes,Laura de Freitas; Chinellato,Tatiana Pimentel; Rosa Júnior,Geraldo Marco.
Facial palsy, parotid diseases and others are a relatively common clinical condition with a variety of causes. Irrespective of its etiology, facial palsy always represents a very serious problem for the patient. Parotid gland diseases also are very common occurrence. In this particular case, the knowledge of surgical anatomy of the facial nerve and its correlations with the parotid gland is very important for an adequate preservation in the cases of surgery of benign and malignant diseases of the parotid gland. Although the surgical anatomy of the facial nerve has been well documented, the concept of surgical treatment for parotid tumors, facial palsy (neurorraphy techniques) and submandibular surgical approach are rarely challenged now.
Tipo: Journal article
Palavras-chave: Facial nerve; Surgical anatomy; Facial palsy; Parotid gland.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100031

Anatomy of the Lymphatic Drainage of the Upper Limb and Breast and its Role in Lymphedema Prevention after Breast Cancer Treatment
Provedor de dados: 77
Autores: Cuadrado,G. A; Andrade,M. F. C; Akamatsu,F. E; Jacomo,A. L.
The surgical treatment of breast cancer has been enhanced throughout the years in order to offer oncologically safer and more effective results with lower esthetic impact and fewer sequelae. The lymphedema of the upper limb is still an iatrogenic result of great incidence and morbidity after this treatment. A possible existence of independent breast and upper limb lymphatic pathways has become the issue of many researchers willing to minimize its occurrence. This review aims to compare the lymphatic pathways in the axilla described by traditional anatomy books and recently published articles about Axillary Reverse Mapping (ARM). With this purpose, a comparative table was made with the descriptions found in books and articles, a statistic table of the data...
Tipo: Journal article
Palavras-chave: Anatomy; Mapping; Axillary; Lymphatics; Upper Limb; Drainage; Breast.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300049

Anatomy of the Mouth of the Giraffe (Giraffa camelopardalis rothschildi)
Provedor de dados: 77
Autores: Pérez,William; Michel,Virginie; Jerbi,Hassen; Vazquez,Noelia.
The giraffe (Giraffa camelopardalis) is both the largest extant ruminant and a strict browser. We dissect and describe the macroscopic anatomy of the mouth of the giraffe. The heads of two adult giraffes and one fetus were used in this study. The lips were well developed, the upper one was predominant and dorsally flattened near the nostrils. The tongue had a lift or lingual torus and rostrally to it a groove-shaped depression or fossa linguae. There was no adipose body of cheek (Corpus adiposum buccae). The hard palate in the giraffe had 18 Rugae palatinae. The final roughness reaches the caudal border of the premolar 3. Caudal ridges had no papillae. The parotid gland was small and consisted of two lobes, one rostral and one caudal to be separated...
Tipo: Journal article
Palavras-chave: Mouth; Giraffe; Giraffa camelopardalis rothschildi; Macroscopic anatomy.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100057

Anatomy of the Nervous of Forearm and Hand of Cebus libidinosus (Rylands, 2000)
Provedor de dados: 77
Autores: Marin,Kliver Antonio; Silva,Frederico Ozanan Carneiro e; Carvalho,Adryano Augustto Valladão de; do Nascimento,Guilherme Nobre Lima; do Prado,Yandra Cássia Lobato; Aversi-Ferreira,Tales Alexandre.
The knowledge on the macroscopic internal structure of Cebus will provide data for histological and biochemical studies and too will contribute to ethological studies. Behavior, memory, use of tools and encephalization index have put the Cebus genus near to chimpanzees in relation to these aspects. The objective of this study is to characterize the nervous model of the forearm and hand of the Cebus monkey. For this, the main nerves and their branches located in the forearm and hand of the Cebus monkey were anatomically characterized, taking into consideration their frequency, number, origin and distribution. The data were compared with the same nerves found in specialized literature in humans, also specialized in other non-human primates. In this study, 7...
Tipo: Journal article
Palavras-chave: Capuchin monkey; Cebus; Anatomy; Nerves; Forearm.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300003

Anatomy of the Sural Nerve Related to Calcaneal Tendon, Intermalleolar Line and Small Saphenous Vein
Provedor de dados: 77
Autores: Dangintawat,Pimpimol; Huanmanop,Thanasil; Agthong,Sithiporn; Chentanez,Vilai.
Sural nerve (SN) courses from the posterior aspect of leg to the lateral side of ankle and foot. Anatomy of the SN is of clinical importance due to its involvement in nerve biopsy, nerve graft harvesting including injuries during calcaneal tendon repair. Despite substantial knowledge in the literature, more easily located landmarks and data regarding the symmetry are still needed. Ninety-eight lower extremities from 31 males and 18 females were dissected in this study. The SN originated from the union between the medial and lateral sural cutaneous nerves in 52.0 % of the legs. The distance from the union point to the intermalleolar line (IML) was 16.3±8.4 (SD) cm. The ratio of this distance to the fibular length (apex of head to lateral malleolus or LM)...
Tipo: Journal article
Palavras-chave: Sural nerve; Anatomy; Calcaneal tendon; Intermalleolar line; Small saphenous vein.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100055

Anatomy of the Thoracic Wall, Axilla and Breast
Provedor de dados: 77
Autores: Macéa,José Rafael; Fregnani,José Humberto Tavares Guerreiro.
For adequate treatment of patients with breast cancer, mastologists should have a complete understanding of the anatomy of the thoracic wall, axilla and breast. However, the classical anatomical descriptions in textbooks make it difficult to gain full mastery of this subject, because the books usually deal with its elements separately. In an endeavor to resolve this difficulty, the present authors have conducted an extensive review, to describe the muscles, blood vessels and nerves of the thoracic wall and in the axilla that are of interest to mastologists. The axilla was described in detail, with emphasis on its limits, walls and contents, and highlighting the lymph nodes in this region. Finally, the anatomy of the breast and its topography, innervation,...
Tipo: Journal article
Palavras-chave: Thoracic wall; Axilla; Breast; Anatomy.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500030

ANDREAE VESALII: THE BONES AND MUSCLES
Provedor de dados: 77
Autores: Ayres de Vasconcellos,Henrique; Barros de Vasconcellos,Pedro Henrique.
The historical references are taken from Aristoteles (384-322 a C) considered the father of Kinesiology, and Claudius Galenus from Pergamon (131-201), the first team doctor. Both men&amp;acute;s studies shared the same objective: functional-anatomic aspects related to the Locomotive System. Although there were several descriptive anatomic studies of bones and muscles, it was Andreas Vesalius (1514-1564), whom most significantly contributed to the development of a new methodology for the lectures of Anatomy, with the setting up of skeletons and dissection of bodies during his lessons. Objectives: the aim of this paper is study the description of bones and muscles from the Vesalius works. We search Vesalius&amp;acute;s publications, specially "De Humani...
Tipo: Journal article
Palavras-chave: Andreas Vesalius; Bones; Muscles; Anatomy; Locomotive System.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000100001

Andreae Vesalii: The Temporomandibular Joint
Provedor de dados: 77
Autores: Vasconcellos,Henrique Ayres de; Barros de Vasconcellos,Pedro Henrique.
The Temporomandibular Joint (TMJ) has been studied for many years since the finding of mummies and fossils. In Egypt of the pharaos, papyrus from the year 3000 B.C. remark the care in which a luxation of the TMJ should be undertaken. In India, at the beggining of the Christian age, in Hipocrates' Greece and in Pergamo of Galenus the TMJ has also been the focus of several studies. But it was Vesalius (Andreae Vesalli), with his particular teaching methodology and publication of his masterpiece De Humani Corporis Fabrica, who showed the way to study Human Anatomy as it is done today. The description of the face bones, of the articular disc and the muscles used for chewing are all a contribution from Vesalius to the anatomic-functional study of TMJ
Tipo: Journal article
Palavras-chave: Andreae Vesalii; TMJ; Temporomandibular Joint; History of Anatomy.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000100019

Andreas Vesalius (1514-1564): Fundador de la Anatomía Humana Moderna
Provedor de dados: 77
Autores: Romero Reveron,Rafael.
Andreas Vesalius, (Andries van Wesel), nació en Bruselas, Flandes, actual Bélgica, el 31 de diciembre de 1514. Estudió Medicina en las Universidades de Lovaina, Paris y Papua, donde se doctoró, graduándose magna cum laude, el 5 de diciembre de 1537, a los 23 años de edad; al día siguiente fue nombrado explicator chirugiae, el equivalente a una cátedra de Cirugía y Anatomía, en la misma Universidad. Durante sus demostraciones prácticas él mismo hacía sus disecciones anatómicas, en lugar de confiárselas a un cirujano, rompiendo con la tradición. Vesalio estudió y develó la Anatomía Humana más que todos sus predecesores al crear, en 1543, De humani corporisfabrica (Sobre la estructura del cuerpo humano), el cual puede considerarse como el primer tratado...
Tipo: Journal article
Palavras-chave: Andreas Vesalius; Anatomía humana; De humani corporis fabrica; Disecciones anatómicas; Enseñanza y aprendizaje.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400026

Andrés Weintraub: Premio Nacional de Ciencias Aplicadas 2000
Provedor de dados: 48
Autores: MEYER Z.,LEONARDO.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000300002

Androgen Receptor Distribution, PAS and Alcyan Blue Reaction in the Vomeronasal Organ and the Nasal Septum Mucosa of the Developing Male Rat
Provedor de dados: 77
Autores: Núñez Chichet,M E; Genovese,P; Bielli,A.
The vomeronasal organ (VNO) is a tubular chemoreceptory organ which detects environmental pheromones and is essential for mammalian normal reproductive activity. A sensitive chemoreceptory neuroepithelium lines the concave VNO wall and the opposite, convex wall is lined by a seudostratified, receptor-free epithelium. The secretion of the Jacobson glands (JG) -tubuloacinary glands lying in the lamina propia of the VNO - is essential for pheromones contacting vomeronasal organ chemoreceptors. Tubuloacinary glands lying in the connective tissue of the nasal septum mucosa (Bowman glands), can be classified as ventral and dorsal, according to their location. Positivity to PAS and Alcyan blue reactions and androgen receptor immunolocalization was evaluated with...
Tipo: Journal article
Palavras-chave: Vomeronasal organ; Chemoreception; Development; Histochemistry; Immunohistochemistry.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300018

Aneurysm, Tortuosity and Kinking of Abdominal Aorta and Iliac Arteries in Thai Cadavers
Provedor de dados: 77
Autores: Boonruangsri,Porntip; Suwannapong,Bussakorn; Rattanasuwan,Somsiri; Iamsaard,Sitthichai.
The prevalence of the aneurysm, tortuosity, and kinking of abdominal aorta and iliac arteries is important for primary consideration in operative planning. The present study was undertaken to investigate the prevalence of abnormality of abdominal aorta and iliac arteries and demonstrate the patterns of kinking external iliac arteries in Thai cadavers. Eighty-five Thai embalmed cadavers (58 males and 27 females) were observed and measured the diameter of abdominal aorta and iliac arteries using a vernier caliper for assessment of aortic aneurysm (AAA). To investigate the tortuosity and kinking of iliac arteries, a standard goniometer was applied to measure the individual angle of iliac artery. In addition, the kinking patterns of external iliac artery were...
Tipo: Journal article
Palavras-chave: Aneurysm; Tortuosity; Kinking; Abdominal aorta; Iliac arteries.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100012

Angiogenesis and Tumor Progression Inhibition of Cyclooxygenase-2 Selective Inhibitor Celecoxib Associated with Poly (lactic-co-glycolic acid) in Tumor Cell Line Resistant to Chemotherapy
Provedor de dados: 77
Autores: Roa,Ignacio; Cantín,Mario; Vilos,Cristian; Rosas,Carlos; Lemus,David.
Although, antineoplastic therapies have now been developed reduction of tumor progression,itis necessarytofind new therapeutic alternatives to suppress angiogenesis.Thus celecoxib (Cx) has been used for its antiangiogenic action in combination with certain polymeric compounds such as poly (lactic co-glycolic acid) (PLGA) acid, which help to improve the bioavailability and avoid effects of long drug administrations. For this purpose we used a murine tumor modelinduced by mammary adenocarcinoma cells resistant to chemotherapy (TA3-MTXR). CX/PLGA inhibits the microvascular density, VEGF expression and cell proliferationinaddition to increased apoptosis (P &lt;0.0001). Cx reduces tumor progression in a concentration of 1000 ppm associated with PLGA, reducing...
Tipo: Journal article
Palavras-chave: Angiogenesis; Cancer; Celecoxib; PLGA; Apoptosis; VEGF; CellProliferation.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200055

Angiogenic potential of the cerebrospinal fluid (CSF) of patients with high-grade gliomas measured with the chick embryo chorioallantoic membrane assay (CAM)
Provedor de dados: 48
Autores: Sinning,Mariana; Letelier,René; Rosas,Carlos; Fuenzalida,Marcela; Lemus,David.
High-grade gliomas are highly vascularized tumors. Neo-angiogenesis plays a key role in tumor growth and resistance to therapy. A cerebrospinal fluid (CSF) sample could be a useful way to obtain pro-angiogenic predictive or prognostic markers at different stages of the disease. As a first step we looked for pro-angiogenic activity in the CSF of patients with high-grade gliomas. We performed the chicken embryo chorio-allantoic membrane (CAM) assay to study the angiogenic potential of the cerebrospinal fluid (CSF), obtained either by lumbar puncture (LP) or craniotomy from six patients with high-grade brain tumors (three glioblastoma (WHO grade IV), one anaplastic oligodendroglioma (WHO grade III), two anaplastic ganglioglioma (WHO grade III)), and four...
Tipo: Journal article
Palavras-chave: Angiogenesis; Cerebrospinal fluid; Glioblastoma; High-grade glioma.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000200005

Angiosarcoma de Mama: A Propósito de Un Caso
Provedor de dados: 77
Autores: González Jiménez,Emilio.
El angiosarcoma de mama constituye una neoplasia vascular maligna muy poco frecuente en la mama, con una incidencia inferior al 0,05% de entre todos los tumores primarios que asientan en la mama. Teniendo en cuenta que su edad de aparición es a partir de la tercera-cuarta década de la vida, resulta preocupante la aparición de casos a edades cada vez más tempranas. Se presenta el caso clínico de una paciente de 25 años de edad con antecedente de fibroma mamario benigno desde los 17 años que degenera en un angiosarcoma mamario.
Tipo: Journal article
Palavras-chave: Angiosarcoma de mama; Evolución clínica; Diagnóstico; Tratamiento.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300041

Ángulo de Inclinación del Fémur en el Hombre y su Relación con la Coxa Vara y la Coxa Valga
Provedor de dados: 77
Autores: Gusmão,Luiz Carlos Buarque de; Sousa Rodrigues,Célio Fernando de; Martins,Josefa Sileda; Silva,Anselmo José da.
Los autores realizan mediciones en fémures aislados, realizando comparación de los datos obtenidos con los resultados encontrados en la literatura investigada, con el objeto de determinar de forma porcentual los valores limítrofes para clasificar la coxa como vara o valga. Fueron analizados 56 fémures de cadáveres adultos, siendo determinado el ángulo de inclinación del fémur, que fue medido a través de un Goniómetro. Utilizamos el patrón poblacional normal de 66% (o test Z) para determinar cuál es el intervalo donde se encuentra el alineamiento ideal. En las mediciones de los ángulos de inclinación de los 56 fémures, los valores se encontraban entre 117,67 grados y 136,67 grados. Utilizando el patrón poblacional normal de 66% (o test Z), verificamos que...
Tipo: Journal article
Palavras-chave: Genu valgo; Genu varo; Osteotomías del fémur; Anatomía.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200013

Animal Models of Nutritional Induction of Type 2 Diabetes Mellitus
Provedor de dados: 77
Autores: Barbosa-da-Silva,Sandra; Sarmento,Isabele Bringhenti; Bargut,Thereza C. Lonzetti; Souza-Mello,Vanessa; Aguila,Marcia Barbosa; Mandarim-de-Lacerda,Carlos A.
Type 2 diabetes mellitus (DM2) is the most common chronic metabolic disease, affecting approximately 6% of the adult population in the Western world. This condition is a major cause of cardiovascular disease, blindness, renal failure, and amputations, with increasing prevalence worldwide. The inuence of obesity on type 2 diabetes risk is determined by the degree of obesity and by body fat localization, with insulin resistance (IR) being the main link between these metabolic diseases. Experimental studies have shown that dietary factors, and particularly lipids, are strongly positively associated with body mass (BM) gain; IR; and, consequently, type 2 diabetes. Similarly, excessive consumption of energy-dense carbohydrate-rich foods can trigger the onset of...
Tipo: Journal article
Palavras-chave: Animal models; Nutritional induction; Metabolic disease; Type 2 diabetes mellitus.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100046

Anomalies, Aneurysm and Histology of the Middle Cerebral Artery in Nigerian Africans
Provedor de dados: 77
Autores: Idowu,O. E; Shokunbi,M.T; Malomo,A. O; Akang,E. E. U.
The histology of the middle cerebral artery (MCA) in Nigerian Africans has not been previously studied. One hundred MCAs obtained at autopsy from fifty adult Nigerians were studied. The vessels were processed and stained with Ehrlich's haematoxylin and eosin, elastic Van Gieson and Masson's trichrome stains. Early branches were given off before the perforators in two middle cerebral arteries, and there was one accessory MCA, making an incidence of anomalies of 3%. No aneurysm was observed in any of the cases. The internal elastic laminas were well developed but the external elastic laminas of the vessels were poorly developed. Cióse to the bif urcations the túnica media tapered gradually and at the bif urcations, the túnica media was completely deficient...
Tipo: Journal article
Palavras-chave: Anomalies; Histology; Middle cerebral artery.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400038

Anomalous Branch of Internal Pudendal Artery
Provedor de dados: 77
Autores: Amorim Júnior,Adelmar Afonso de; Amorim,Marleyne José Afonso Accioly Lins; Lins,Carla Cabral dos Santos Accioly; Alvim,Marconi Martins Simoes; Araújo,Felipe Purcell de; Queiroz,Nadieska Sales Araújo.
The ischiatic artery classically described as a branch of the inferior gluteal artery, is a long and thin vessel that is related to the ischiatic nerve. In a dissection was observed that this artery emerges from the internal pudendal artery with a caliber larger than the ones described in the literature. The knowledge of anatomical variations is important to the surgeons, radiologists and anatomists
Tipo: Journal article
Palavras-chave: Anatomy; Gluteal region; Inferior gluteal artery; Squiatic nerve.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100009

Anomalous Branching Pattern of Lateral Cord of Brachial Plexus
Provedor de dados: 77
Autores: Das,Srijit; Paul,Shipra.
During routine dissection, an unusual formation of median nerve was detected in the right upper limb of a 55 year old male cadaver. The median nerve had an additional contribution from lateral cord. The two branches of the lateral cord designated as upper and the lower branches were observed at different levels. The upper branch was in close contact with the third part of the axillary artery and it crossed the vessel anteriorly to unite with a branch of the medial cord to form the median nerve. The median nerve thus formed was related medially to the axillary artery (instead of the normal position of being anterolateral). The median nerve descended below and was joined by an additional lower branch from the lateral cord. Interestingly, the ulnar nerve...
Tipo: Journal article
Palavras-chave: Lateral cord; Brachial plexus; Median nerve; Anatomical variation.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000400001

Anomalous Branching Patterns of the Axillary Artery
Provedor de dados: 77
Autores: Kim,Jong-Wan; Park,Hyo Seok; Park,Jin Seo; Jung,Yong-Wook.
Arterial variations in the upper limbs can cause iatrogenic injury during invasive procedures. During educational dissection of countered uncommon branching patterns of the axillary artery which have not yet been reported yet, to our knowledge. First, the second part of the axillary artery was divided into three trunks. The lateral trunk ran downward as a superficial brachioradial artery. The medial trunk raised the lateral thoracic artery, and was divided into the subscapular artery and the posterior circumflex humeral artery. The intermediate trunk branched off the anterior circumflex humeral artery as expected for an axillary artery. Second, in the other cadaver, we found a common trunk containing the thoracoacromial artery and a bulk artery dividing...
Tipo: Journal article
Palavras-chave: Arterial variations; Axillary artery; Upper limb; Branching patterns.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100022

Anomalous Lobar Pattern of Right Lung: A Case Report
Provedor de dados: 77
Autores: Modgil,Vishal; Das,Srijit; Suri,Rajesh.
The right lung classically has two fissures, an oblique and a horizontal, dividing it into three lobes namely the superior, middle and lower. The anomaly of the lobar pattern has been described by many research workers on CT scans, where as, there are fewer studies on gross anatomical specimens. In the present case , which was incidentally detected, we report three fissures dividing the right lung into four lobes. Such abnormal fissures and lobes are clinically important for identifying broncho-pulmonary segments. Anatomical knowledge of anomalies of fissures and lobes of lungs may be important for surgeons performing lobectomies, radiologists interpreting X ray and CT scans and also of academic interest to all medical personnel
Tipo: Journal article
Palavras-chave: Anomaly; Anatomical variation; Abnormal; Fissure; Lobe; Lung.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000100001

Anomalous Origin of Cystic Artery from Gastroduodenal artery ­ A Case Report
Provedor de dados: 77
Autores: Vishnumaya,G; Bhagath,Kumar Potu; Vasavi,Rakesh Gorantla; Thejodhar,P.
The knowledge of vascular variations, like other anatomical variations, is important during the operative, diagnostic and endovascular procedures in abdomen. Variations in the branching pattern of the common hepatic artery often occur and may be encountered during cholecystectomy. This report describes a variation in the origin of cystic artery from the gastro duodenal artery as found during routine dissection in an approximately 34 years old male cadaver. The embryological development and clinical implications of such a variant have been discussed in the article.
Tipo: Journal article
Palavras-chave: Ysticartery; Gastroduodenal artery; Vascular variations.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100012

Anomalous Origin of Left Internal Thoracic Artery from the Second Intercostal Artery
Provedor de dados: 77
Autores: Mehmet,O. C; Bahar,O. C; Pasaoglu,Ilhan.
Left internal thoracic artery (LITA) has increased importance and common use in coronary bypass grafting because of long-term better patency rate and improvement in both the duration and quality of survival of patients. LITA is a branch of the first part of the subclavian artery. We report a case in which the LITA originated from the second left intercostal artery. A 71-year-old man with a history of angina pectoris for 1 month was admitted to the hospital because of progressive increase in anginal symptoms. During the operation, it was noted that the LITA originated from the second intercostal artery. LITA used as a free graft. LITA was anastomosed to the left anterior descending coronary artery. He was free of symptoms 4 weeks after operation. To our...
Tipo: Journal article
Palavras-chave: Internal thoracic artery; Anomalies; Cardiac surgery.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400051

Anomalous Origin of Obturator Artery from the Internal Iliac Artery
Provedor de dados: 77
Autores: Kumar,Dinesh; Rath,Gayatri.
Obturator arteryis frequently a branch of anterior division of internal iliac artery or one of the parietal branches of internal iliac artery. But it has attracted attention of pelvic surgeons and anatomists and radiologists because of the high frequency of the variation in its course and origin. The present report demonstrates obturator artery to be arising from the posterior division of internal iliac artery out of 316 pelvises, a rare observation in Indian population. The variation is correlated developmentally and its clinical implications are also discussed
Tipo: Journal article
Palavras-chave: Obturator artery; Anatomical variation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300028

Anomalous Origin of the Circumflex Branch from the Right Coronary Artery
Provedor de dados: 77
Autores: Bayat,Parvindokht; Masoud,Farhadi; Ghanbari,Ali; Gannnnji-Harsini,Sedigheh.
Coronary anomalies are a group of congenital disorders. Most of the coronary anomalies are asymptomatic and benign but may cause myocardial ischemia and sudden death. Some of them are dangerous if they associate with other heart diseases. One of the congenital coronary anomalies is anomalous origin of the circumflex branch from the right coronary artery that is a rare congenital anomaly. We present a case of a 61-year-old man with history of hypertension, diabetes mellitus and hyperlipidemia. The coronary angiography reveals a circumflex branch from the right coronary artery.
Tipo: Journal article
Palavras-chave: Circumflex branch; Coronary artery; Anatomical variation; Congenital disorders.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100028

Anquilosis de ATM: Riesgos Anatómicos y Potencialidad del Sistema Piezoeléctrico
Provedor de dados: 77
Autores: Alister,Juan Pablo; Uribe,Francisca; Olate,Sergio; Unibazo,Alejandro; Almeida,Andrés.
El objetivo de este trabajo es presentar los riesgos anatómicos en el abordaje de la anquilosis de la articulación temporo mandibular (ATM) y el uso del sistema piezoeléctrico para realizar la resección de la misma. La paciente sexo femenino, 12 años, presento una anquilosis de la ATM derecha, previamente operada en base a reconstrucción con un injerto costocondral. Luego de 4 años de realizada la primera reconstrucción se presentó con una nueva anquilosis del área presentando una masa de tejido óseo de 31 mm en sentido latero-medial, que abarcaba hasta el foramen oval en la base de cráneo y de 28 mm en sentido anteroposterior. La lesión fue abordada con un acceso preauricular y posterior resección con sistema piezoeléctrico, utilizando una técnica de...
Tipo: Journal article
Palavras-chave: Anquilosis de ATM; Sistema piezoeléctrico; Osteotomía.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200043

Antagonism of morphine-induced central respiratory depression by donepezil in the anesthetized rabbit
Provedor de dados: 48
Autores: TSUJITA,MIKI; SAKURABA,SHIGEKI; KURIBAYASHI,JUNYA; HOSOKAWA,YUKI; HATORI,EIKI; OKADA,YASUMASA; KASHIWAGI,MASANORI; TAKEDA,JUNZO; KUWANA,SHUN-ICHI.
Morphine is often used in cancer pain and postoperative analgesic management but induces respiratory depression. Therefore, there is an ongoing search for drug candidates that can antagonize morphine-induced respiratory depression but have no effect on morphine-induced analgesia. Acetylcholine is an excitatory neurotransmitter in central respiratory control and physostigmine antagonizes morphine-induced respiratory depression. However, physostigmine has not been applied in clinical practice because it has a short action time, among other characteristics. We therefore asked whether donepezil (a long-acting acetylcholinesterase inhibitor used in the treatment of Alzheimer's disease) can antagonize morphine-induced respiratory depression. Using the...
Tipo: Journal article
Palavras-chave: Morphine; Donepezil; Rabbit; Respiratory depression; Alzheimer's disease; Cholinesterase inhibitor.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000400008

ANTECEDENTES ARQUEOLÓGICOS DEL GENERO DIPLODON (SPIX, 1827) (BIVALVIA, HYRIIDAE) EN CHILE
Provedor de dados: 72
Autores: Jackson,Donald; Jackson,Douglas.
Se presenta una revisión bibliográfica de los registros del género Diplodon (Spix, 1827) (Hyriidae), presentes en sitios arqueológicos de Chile. Las evidencias indican una efímera presencia de estos bivalvos en contextos arqueológicos de finales del Pleistoceno, mientras que durante gran parte del Holoceno su registro es más significativo. No obstante, sólo algunos sitios arqueológicos muestran su utilización como materia prima y/o recurso alimenticio. Las evidencias arqueológicas de Diplodon muestran similar distribución a la actual. Se discuten algunas implicancias paleoambientales y biogeográficas en relación a su distribución, así como la necesidad de vincular esta información con distintas disciplinas para entender la importancia de su rol en...
Tipo: Journal article
Palavras-chave: Diplodon; Hyriidae; Almeja de agua dulce; Arqueología; Cronología; Chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200008

Antecedentes biológicos de hormigas presentes en Chile publicados en revistas científicas nacionales y extranjeras durante el siglo XX
Provedor de dados: 97
Autores: TORRES-CONTRERAS,HUGO.
Se revisa la información sobre biología de hormigas presentes en Chile publicada en revistas científicas nacionales y extranjeras durante el período 1900-1999. Se evalúan estos antecedentes en términos de: (i) la dinámica temporal de la producción de publicaciones, (ii) las principales temáticas de estudio, y (iii) los géneros de formícidos en los cuáles se ha concentrado la investigación. Los datos recolectados muestran que sólo a partir de la década del 60' se produce un marcado crecimiento del número de artículos sobre hormigas, lo cual alcanza su máxima expresión durante la década del 90'. Los principales tópicos de investigación han sido, en orden decreciente, aspectos sobre taxonomía, uso del hábitat, períodos de actividad, conductas tróficas y de...
Tipo: Journal article
Palavras-chave: Hormigas; Chile; Ecología; Taxonomía; Camponotus; Solenopsis.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300011

Antecedentes históricos en la descripción y del uso de Sophora toromiro (Phil.) Skottsb. (Fabaceae) en su hábitat natural: 1770-1948
Provedor de dados: 73
Autores: Espejo,Jaime; Rodríguez,Roberto.
Sophora toromiro (Phil.) Skottsb. especie extinta en Isla de Pascua es descrita como un árbol de pequeñas dimensiones para mediados del siglo XVIII. Los bosquetes identificados por los relatos quedan ubicados mayoritariamente al interior de la isla, como en la cima de los cráteres de los volcanes de Rapa Nui. La madera fue ampliamente utilizada por los isleños principalmente en artefactos de índole sacra, sin embargo ya a fines del siglo XVIII la necesidad de madera y la pérdida de culto por las nuevas generaciones de Rapa Nui evidencian un cambio en su uso. Los últimos bosquetes como rebrotes fueron diezmados por herbivoría de masa ovejuna que fue desarrollada a gran escala en Isla de Pascua. En la actualidad esta especie está catalogada como extinta en...
Tipo: Journal article
Palavras-chave: Sophora toromiro; Conservación; Isla de Pascua.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200015

Antecedentes poblacionales de Chaptalia exscapa (Pers.) Baker var. chilensis (DC.) Burkart en la provincia de Talca, Chile central
Provedor de dados: 73
Autores: GÓMEZ,PERSY; HAHN,STEFFEN; SAN MARTÍN,JOSÉ; BELOV,MICHAIL.
We examine the distribution and ecology of Chaptalia exscapa (Pers.) Baker var. chilensis (DC.) Burkart in the Talca Province, Maule Region. It is reports new data related to the morphology of the plant and the presence of Chaptalia in four new localities in the Maule Region. The populations present a high vulnerability due low population size and disturbed habitat. Flowering and fructification of individuals is scanty.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100020

Anterior Disc Displacement and the Superior Head of Lateral Pterygoid Muscle: A Case-Control Study
Provedor de dados: 77
Autores: Pompei Filho,Horácio; Suazo Galdames,Iván; Zavando,Daniela; Guimarães,Antonio Sergio.
The objective of this study was to assess the association between an increase in the proportion of the superior head of the lateral pterygoid muscle (SHLP) inserted into the temporomandibular joint (TMJ) disc and the presence of anterior disc displacement diagnosed by using MRI. We analyzed 75 images of patients with anterior displacement and 75 controls with normal relationship between the mandibular head and the articular tubercle also diagnosed by MRI. Levels of insertion were measured. Descriptive and analytic statistics were calculated. Analyses of differences were made by Fischer's exact test and also were calculated clinical significance (OR, CI = 95%). The average insertion of SHLP was 71.14% (SD 14.13) in controls and 67.80% (SD.16.23) in cases...
Tipo: Journal article
Palavras-chave: Temporomandibular joint; Lateral pterygoid muscle; Articular disc; Anterior disc displacement.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200004

Anthropological and Perceptual Predictors Affecting the Ranking in Arm Wrestling Competition
Provedor de dados: 77
Autores: Akpina,Selcuk; Zileli,Raif; Senyüzlü,Emre; Tunca,Seydi A.
The purpose of this study was to investigate the predictors contributing to be in the first three places with right and left arm in armwrestling. Seventy-three male senior armwrestlers competed in Turkish National Championship voluntarily participated in this study. Some participants competed with both arms. Two samples were composed of according to the participant competition category, for right (69 participants) and left arm (65 participants). The data were collected from eight different weight classes. Handgrip strength, auditory reaction time, forearm length, and forearm circumference were determined as the predictors. All the measurements were taken after weigh-ins had been done and before the first day of national championship competition. Logistic...
Tipo: Journal article
Palavras-chave: Handgrip strength; Auditory Reaction Time; Forearm length; Forearm Circumference; Armwrestling.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300009

Anthropometric and Physical Fitness Characterization of Male Elite Karate Athletes
Provedor de dados: 77
Autores: Sánchez-Puccini,María B; Argothy-Bucheli,Rodrigo E; Meneses-Echávez,José F; López-Albán,Carlos Alejandro; Ramírez-Vélez,Robinson.
This study aimed to assess anthropometric and physical fitness characteristics of male elite karate athletes. Our study was carried out on a sample of 19 male Karate Athletes from Colombia (mean age 31.6±8.8 years). Different anthropometric measurements were taken (weight, height, diameters, circumferences, body composition) from which several anthropometric indices were calculated (body mass index, ponderal index, body index adiposity), and the somatotype was then determined. The performance tests carried out were: Astrand-Ryming protocol, vertical jump, anaerobic power and Wingate anaerobic test. The results (mean±SD) showed a body mass (65.4±12.0 kg), height (167.4±9.3 cm), percent body fat (13.6±3.0 %), ponderal index (41.0±1.8) and body adiposity...
Tipo: Journal article
Palavras-chave: Karate; Body Composition; Somatotype; Fitness; Anthropometry.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300045

Anthropometric Characteristics and Body Composition in Aikido Practitioners
Provedor de dados: 77
Autores: Reguli,Zdenko; Bernaciková,Martina; Kumstát,Michal.
Although aikido is a non-competitive martial art, it is recognised by SportAccord as worldwide practiced combat sport. There is a lack of scientific research in aikido and the influence of aikido practice on the human body is not known. This is the first study that presents anthropometric characteristics and body composition data in aikido practitioners. 33 adult male aikido athletes (age 36.5±9.6 years, height 178±8 cm, weight 81.2±10.1 kg) were measured. All subjects were divided from beginner to intermediate and advanced group, and were recruited from the Czech Aikido Federation which is officially recognised by the centre of aikido in Japan. As main methods, bio impedance and skinfold measurements were realized. In aikido, body composition does not...
Tipo: Journal article
Palavras-chave: Matiegka; Bioimpedance; Martial arts; Body mass.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200001

Anthropometric Characteristics of Elite Rhythmic Gymnasts
Provedor de dados: 77
Autores: Arriaza,Enrique; Rodríguez,Carolina; Carrasco,Claudia; Mardones,Claudia; Niedmann,Luis; López-Fuenzalida,Antonio.
The main aim of this study was to identify the morphological characteristics, to determine the tendency in the physical structure, differences and similarities according to categories based on age of the Chilean team of Rhythmic Gymnastics. We performed an anthropometric analysis of 60 gymnasts, fractioned by categories: preschoolers and schoolers (n= 11), junior (n= 28) and senior (n= 21). The anthropometric analysis was determined based on the study of the body composition, through pentacompartimental fractionation method (Kerr), somatotype (Heath &amp;amp; Carter) and the body mass index (Quetelet). The results showed significant differences between preschoolers and schoolers and higher categories (junior and senior) in the general anthropometric...
Tipo: Journal article
Palavras-chave: Rhythmic gymnastics; Kinanthropometry; Age categories.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100003

Anthropometric Characteristics of Top-Class Brazilian Jiu Jitsu Athletes: Role of Fighting Style
Provedor de dados: 77
Autores: Báez,E; Franchini,E; Ramírez-Campillo,R; Cañas-Jamett,R; Herrera,T; Burgos-Jara,C; Henríquez-Olguín,C.
Human performance efficiency and effectiveness in different sports depend to a large extent on the size, weight and proportion of the physique of the athlete. The aim of this study was to identify morphological characteristics of Brazilian Jiu-Jitsu (BJJ) athletes. The sample consisted of 25 highly trained male athletes who were classified according to their fighting style; guard fighter (GF) vs. pass fighter (PF). The athletes were assessed for somatotype, body composition and proportionality. For the whole group of athletes the somatotype was 2.23±0.68, 6.33±1.14, and 1.75±0.87 for endomorph, mesomorph and ectomorph components, respectively. Muscle and adipose tissue percentages were 52.34±2.15% and 19.30±2.51%, respectively. PF were significantly more...
Tipo: Journal article
Palavras-chave: Anthropometric characteristics; Somatotype; Jiu Jitsu; Fighting style.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300048

Anthropometric Landmarks for Posterior Cruciate Ligament Reconstruction in Anatomical Position
Provedor de dados: 77
Autores: Compeán-Martínez,Gustavo Adolfo; Morales-Avalos,Rodolfo; Vílchez-Cavazos,Félix; Acosta-Olivo,Carlos; Mendoza-Lemus,Oscar Fernando; de la Garza-Castro,Oscar; Elizondo-Omaña,Rodrigo E; Guzmán-López,Santos.
To determine viable anatomical landmarks allowing for accurate femoral and tibial tunnel placement in anatomical position during posterior cruciate ligament (PCL) reconstruction. Ten knees were dissected to analyze femoral and tibial PCL insertion measurements and the features specific to the PCL and its fascicles. The clock hands system was used to measure femoral insertions. The meniscus and anterior cruciate ligament (ACL) were used as landmarks to measure tibial insertions. The PCL and its corresponding fascicle characteristics were determined by its femoral insertion, central portion and tibial insertion. The mean lengths between the central point of the PCL footprint and the articular cartilage border at 12:00 h were 17.23 mm (±3.94) and 17.73 mm...
Tipo: Journal article
Palavras-chave: Posterior cruciate ligament; Femoral tunnels; Reconstruction; Anatomy; Landmark.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200042

Anthropometric Measurements in Toothed and Toothless Maxillaries and its Consequences in Human Alveolar Bone Resorption
Provedor de dados: 77
Autores: de Oliveira,Jaciel Benedito; Almeida,Andrelle Nayara Cavalcanti Lima de; Lins,Carla Cabral dos Santos Accioly; Júnior,Adelmar Afonso de Amorim; Seixas,Zélia Albuquerque.
This study proposes to measure and compare anthropometric measurements between toothed and toothless maxillas. 26 human skulls were used with: 13 toothed and 13 toothless maxillas. The measurements were made between the distances of the alveolar ridge (AR): the anterior nasal spine (ANS), to the incisive foramen (FI) and the palatine foramen, greater (FPMA) and lower (FPME) on both sides by two evaluators. The data obtained showed that the average of the measurements were correspondingly higher in toothed maxillas than in toothless, for all measurements in any one of the evaluators. The AR-ANS (p = 0.001), IF-AR (p = 0.006), AR-FPMA right (p = 0.001) and AR-FPMA left (p &lt;0.001) and AR-FPME on both sides (p = 0.001) demonstrating significant differences...
Tipo: Journal article
Palavras-chave: Anatomy; Maxilla; Total prosthesis; Alveolar bone loss; Dental implantation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300064

Anthropometric Parameters of Cadets Among Different Military Sports
Provedor de dados: 77
Autores: Salgueiro,Diego Fortes de Souza; Barroso,Renato; Barbosa,Augusto Carvalho; Telles,Thiago; Júnior,Orival Andries.
This study compared anthropometric parameters among different military sports. One hundred and seventy male cadets of the Brazilian Air Force Academy, who were participants of athletics (n= 33, 20.5±1.3 years), basketball (n= 11, 19.9±1.8 years), fencing (n= 10, 19.9±0.7 years), soccer (n= 21, 20.9±1.6 years), judo (n= 17, 20.7±1.0 years), swimming (n= 15, 20.4±1.2 years), orienteering (n= 10, 21.3±1.6 years), military pentathlon (n= 11, 20.7±1.2 years), water polo (n=10, 21.1±0.9 years), shooting (n= 18, 21.3±1.2 years) or volleyball (n= 14, 20.9±1.7 years) military competitive teams, participated in this study. Height, body mass, body mass index, fat percentage, lean body mass, fat mass, waist and hip perimeters, and waist-hip ratio were measured. Main...
Tipo: Journal article
Palavras-chave: Cadets; Anthropometric parameters; Military sports.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300004

Anthropometrical Characteristics and Somatotype of Young Macedonian Soccer Players
Provedor de dados: 77
Autores: Gontarev,Seryozha; Kalac,Ruzdija; Zivkovic,Vujica; Ameti,Vullnet; Redjepi,Agim.
The success in sport performance is closely related to the physical condition of the sportsman. In the assessment of the physical status except physiological and fitness parameters, significant influence have the anthropometric parameters. The aim of the study was dual: to assess the changes in the anthropometric characteristics and the somatotype of young soccer players at different ages and to compare these characteristics with the general population. The analyzed measurements of 486 young soccer players who play in teams of the First national league, with an average age 15.8±1.4. The soccer players were divided into five subgroups, at age difference of 1 year. In the sample height, weight, BMI index, diameters, volumes and skin folds were measured, also...
Tipo: Journal article
Palavras-chave: Soccer; Young; Anthropometry; Somatotype; Growth; Age.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100024

Anthropometrical Characteristics of Subjects in Predicting Technique Achievements of Basic Turn in Alpine Skiing
Provedor de dados: 77
Autores: Hadzic,Rasid; Bjelica,Dusko; Georgiev,Georgi; Vujovic,Dobrislav; Popovic,Stevo.
This research analyzes the techniques involved in basic turn in relation to anthropometric characteristics of subjects. The aim of this study was to determine the difference in the technique of basic turn performance in relation to anthropometric characteristics of subjects. In a sample of 30 students, average age 22 years, male, measuring by 12 anthropometric measures and a situational-motor test was carried out. Alpine skiing technique was assessed through primary windings, the technical element of skiing which is present in the basic form of skiing. Based on these results, we can conclude that, the differences are established and boundaries are clearly defined in the level of adoption of the basic turn techniques between subsamples in relation to...
Tipo: Journal article
Palavras-chave: Alpine skiing; Basic turn; Anthropometric characteristics.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100039

Anthropometrical Profile of Judo Athletes: Comparative Analysis Between Weight Categories
Provedor de dados: 77
Autores: Franchini,Emerson; Sterkowicz-Przybycien,Katarzyna; Takito,Monica Yuri.
This study compared the anthropometrical characteristics in judo athletes of different weight categories. The sample was composed by 104 Brazilian male judo athletes of national/international level from all seven official weight categories: extra-lightweight (-60 kg; n = 16), half-lightweight (-66 kg; n = 12), lightweight (-73 kg; n = 24), half-middleweight (-81 kg; n = 25), middleweight (-90 kg; n = 15), half-heavyweight (-100 kg; n = 7) and heavyweight (+100 kg; n = 5). The following anthropometric measurements were carried out: body mass, height, skinfold thickness (triceps, subscapular, suprailiac, abdominal, front thigh, and medial calf), circumferences (chest, relaxed arm, flexed arm, forearm, wrist, proximal thigh, medial calf and ankle) and breadth...
Tipo: Journal article
Palavras-chave: Combat sports; Skinfold thickness; Bone diameters; Circumferences; Somatotype.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100007

Anthropometry of Internal Acoustic Meatus
Provedor de dados: 77
Autores: Farahani,Reza Masteri; Nooranipour,Mehrdad; Nikakhtar,Kamran Vafaei.
Knowledge of the normal dimensions and local anatomy of the internal acoustic canal (IAM) is necessary during evaluation of temporal bone trauma, congenital anomalies, affecting the individual nerves, and some neuro-otologic surgeries. The purpose of this study was therefore to characterize the anthropometry of the IAM. We made the following measurements in 14 normal temporal bones of Iranian male skulls from individuals 35 to 60 years of age (average of 50): Height and width of the middle portion of the IAM (mean 4.04 and 3.69mm), Height and width of the fundus of the IAM (mean 2.86 and 2.43mm), inferior and superior length of the IAM (mean 8.39 and 10.75mm).This study provides baseline information that maybe used to evaluate the congenital anomalies of...
Tipo: Journal article
Palavras-chave: Internal acoustic meatus; Anthropometry; Anatomy; Temporal Bone.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400029

Anthropometry of the Black Adult Tibia: A South African Study
Provedor de dados: 77
Autores: Naidoo,N; Lazarus,L; Ajayi,N. O; Satyapal,K. S.
The tibia is the medial long bone of the leg and is characterized by a shaft and two expanded extremities. Despite the recent advent of tibial bone graft harvesting, the tibia has also been confirmed to be of great forensic significance. As this appears to be the only tibial dry bone study done in Southern Africa, this study aimed to investigate morphological and morphometric parameters that are of clinical and anthropometric importance. Morphological and morphometric examination of 302 adult tibial bone specimens of Black South Africans obtained from the osteological bank of the Discipline of Clinical Anatomy at the University of KwaZulu-Natal was performed. The sample consisted of 168 males and 134 females with an age range of 15 to 87 years old. The...
Tipo: Journal article
Palavras-chave: Tibia; Nutrient Foramen; Soleal Line; Morphometry.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200030

Antiangiogenic effect of betamethasone on the chick cam stimulated by TA3 tumor supernatant
Provedor de dados: 48
Autores: LEMUS,DAVID; DABANCENS,ALFREDO; ILLANES,JULIO; FUENZALIDA,MARCELA; GUERRERO,ANIBAL; LÓPEZ,CLAUDIA.
Tumor growth is the result of combined cell proliferation overwhelming cell death and neoangiogenesis. This report shows CAM angiogenesis promoted by TA3 tumor supernatant with or without low dosis of betamethasone (Minimal antiangiogenic concentration: ß-MAAC). Methylcellulose discs instilled with 10 µl of ß-MAAC (0.08 µg/ml),10 µl of tumor supernatant(TA3ts),5 µl ß-MAAC + 5 µl TA3ts, and 10 µl of PBS as control were implanted in host chick eggs. On day 12, the grafts were removed, photographed and fixed. Sections were stained in parallel, one and three with hematoxylin-eosin, and section two by the Tunel method. The number of vessels was evaluated in a microscopic field of the CAM (2250 µm2 ). The results show that ß-MAAC produced a significant...
Tipo: Journal article
Palavras-chave: Antiangiogenesis; Betamethasone; CAM; Tumor.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000300010

Antiangiogenic VEGF165b Expression in Human Breast MCF-7 and MCF-10A Cells Exposed to Reverse Transcriptase and Protease Inhibitors
Provedor de dados: 77
Autores: Adefolaju,Gbenga Anthony; Scholtz,Kathrine Elizabeth; Hosie,Margot Jill.
The combined antiretroviral therapy (cART), a multidrug combination regimen, usually consisting Nucleoside Reverse Transcriptase Inhibitors, non- Nucleoside Reverse Transcriptase Inhibitors and Protease Inhibitors has altered the morbidity pattern affecting HIV-infected individuals to include non-AIDS-defining malignancies (nADMs). The speculation is rife; does cART induce or promote the progression of nADMs such as breast cancer? This study was therefore designed to investigate of the effects of some antiretroviral drugs (at clinically relevant concentrations) on the expression of anti-angiogenic gene; VEGF165b in two human breast cell lines; MCF-7 and MCF-10A by Real Time qPCR and immuno-fluorescence. All of the antiretroviral drugs and combinations...
Tipo: Journal article
Palavras-chave: Reverse Transcriptase Inhibitors; Protease Inhibitors; VEGF165b; Breast cancer; MCF-7; MCF-10A.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100024

Antibacterial activity of the Antarctic bacterium Janthinobacterium sp: SMN 33.6 against multi-resistant Gram-negative bacteria
Provedor de dados: 69
Autores: Asencio,Geraldine; Lavin,Paris; Alegría,Karen; Domínguez,Mariana; Bello,Helia; González-Rocha,Gerardo; González-Aravena,Marcelo.
Background The increment of resistant strains to commonly used antibiotics in clinical practices places in evidence the urgent need to search for new compounds with antibacterial activity. The adaptations that Antarctic microorganisms have developed, due to the extreme environment that they inhabit, promote them as a potential new source of active compounds for the control of microorganisms causing infections associated with health care. The aim of this study was to evaluate the antibacterial activity of an ethanol extract of the Antarctic bacterium Janthinobacterium sp., strain SMN 33.6, against nosocomial multi-resistant Gram-negative bacteria. Results Inhibitory activity against human Gram-negative bacterial pathogens, with concentrations that varied...
Tipo: Journal article
Palavras-chave: Antarctica; Antimicrobial; Antibiotic resistance; Bacterial pigment.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100001

Anticancer and apoptosis-inducing activities of microbial metabolites
Provedor de dados: 69
Autores: Phonnok,Sirinet; Uthaisang-Tanechpongtamb,Wanlaya; Wongsatayanon,Benjamas Thanomsub.
The problems of systemic toxicity and drug resistance in cancer chemotherapy urge the continuing discovery of new anticancer agents. We explored the specific anticancer activity from microbial metabolites to find new lead compound. 394 microbial extracts were evaluated on anti-proliferative activity against 4 cancer cell lines using MTT assay. Of these, 20 samples showed varying degree of cytotoxicity but specifically to the cancer cell lines since the growth of normal cells was not significantly inhibited by 1 mg/ml of each cell extracts. The 4 most potent extracts exhibited strongest growth inhibition to each cancer cell type were selected for further studied. Cell morphological changes such as cell shrinkage, lose of surface contact and blebbing were...
Tipo: Journal article
Palavras-chave: Anticancer; Apoptosis; Bioactive compound; Caspase; Microbial product.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500001

Anticancer properties and enhancement of therapeutic potential of cisplatin by leaf extract of Zanthoxylum armatum DC
Provedor de dados: 48
Autores: Singh,Thangjam Davis; Meitei,Heikrujam Thoihen; Sharma,Adhikarimayum Lakhikumar; Robinson,Asem; Singh,Lisam Shanjukumar; Singh,Thiyam Ramsing.
BACKGROUND: Clinical use of chemotherapeutic drug, cisplatin is limited by its toxicity and drug resistance. Therefore, efforts continue for the discovery of novel combination therapies with cisplatin, to increase efficacy and reduce its toxicity. Here, we screened 16 medicinal plant extracts from Northeast part of India and found that leaf extract of Zanthoxylum armatum DC. (ZALE) induced cytotoxicity as well as an effect on the increasing of the efficiency of chemotherapeutic drugs (cisplatin, mitomycin C and camptothecin). This work shows detail molecular mechanism of anti-cancer activity of ZALE and its potential for combined treatment regimens to enhance the apoptotic response of chemotherapeutic drugs. RESULTS: ZALE induced cytotoxicity, nuclear...
Tipo: Journal article
Palavras-chave: Zanthoxylum armatum; Apoptosis; ERK activation; Cisplatin sensitization; DNA damage.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100046

Anticholinesterse and antioxidant investigations of crude extracts, subsequent fractions, saponins and flavonoids of atriplex laciniata L.: potential effectiveness in Alzheimer's and other neurological disorders
Provedor de dados: 48
Autores: Kamal,Zul; Ullah,Farhat; Ayaz,Muhammad; Sadiq,Abdul; Ahmad,Sajjad; Zeb,Anwar; Hussain,Abid; Imran,Muhammad.
BACKGROUND: Atriplex laciniata L. was investigated for phenolic, flavonoid contents, antioxidant, anticholinesterase activities, in an attempt to explore its effectiveness in Alzheimer's and other neurological disorders. Plant crude methanolic extract (Al.MeF), subsequent fractions; n-hexane (Al.HxF), chloroform (Al.CfF), ethyl acetate (Al.EaF), aqueous (Al.WtF), Saponins (Al.SPF) and Flavonoids (Al.FLVF) were investigated for DPPH, ABTS and H2O2 free radical scavenging activities. Further these extracts were subjected to acetylcholinesterase (AChE) &amp;amp; butyrylcholinesterase (BChE) inhibitory activities using Ellman's assay. Phenolic and Flavonoid contents were determined and expressed in mg Gallic acid GAE/g and Rutin RTE/g of samples respectively....
Tipo: Journal article
Palavras-chave: Phenolic &amp;amp; Flavonoid contents DPPH ABTS H2O2 Gallic acid IC50 and anticholinesterase.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100021

ANTICYCLONIC EDDIES IN THE ALASKA GYRE (AND CAPE HORN CURRENT?)
Provedor de dados: 72
Autores: Ted Strub,P.
Sea surface height (SSH) fields, constructed from multiple altimeters, have revealed the annual generation of anticyclonic eddies around the Alaska Gyre. These eddies appear to develop annually along the eastern margin of the Gyre from instabilities in the poleward Alaska Current, after it reaches its seasonal maximum in transport in winter. After forming, the eddies propagate westward just offshore of the continental slope, where they draw shelf water containing nutrients and phytoplankton into the deep offshore waters, as seen by the SeaWiFS satellite ocean color sensor. In this manner, they enrich a region of the ocean that is dominated by downwelling-favorable wind forcing. Off Chile, the Cape Horn Current is the analog of the Alaska Current, flowing...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300042

Antifeeding and Insecticide Properties of Aqueous and Ethanolic Fruit Extracts from Melia azedarach L.on the Elm Leaf Beetle Xanthogaleruca luteola Müller
Provedor de dados: 117
Autores: Chiffelle,Italo; Huerta,Amanda; Azúa,Fernando; Puga,Karla; Araya,Jaime E.
Xanthogaleruca luteola Müller (Coleoptera: Chrysomelidae), a defoliator of Ulmus species currently present in several regions of central Chile, causes severe damage to trees, mainly in park areas, street tree-lines and gardens. The antifeeding and insecticidal activities of extracts from immature fruit of Melia azedarach L. (Meliaceae) were determined on adults of X. luteola in laboratory bioassays. Several concentrations of the extracts obtained with water and ethanol were used and their effectiveness and LC50 were determined. The antifeeding action of the water extracts caused 100% deterrence over concentrations of 3.6% w/v. Both extracts were effective insecticides against adults, causing 86% mortality (2.4% w/v), with a better performance of the...
Tipo: Journal article
Palavras-chave: Botanical insecticides; Ethanol extract; Water extract.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200006

Antifungal activity of Crotalaria longirostrata Hook. &amp;amp; Arn. extracts against phytopathogen fungi from maize
Provedor de dados: 73
Autores: Cruz-Rodríguez,Rosa Isela; Meza-Gordillo,Rocío; Rodríguez-Mendiola,Martha Alicia; Arias-Castro,Carlos; Mancilla-Margalli,Norma Alejandra; Ávila-Miranda,Martín Eduardo; Culebro-Ricaldi,José Miguel; Gutiérrez-Miceli,Federico Antonio; Ruiz-Valdiviezo,Víctor Manuel; Ayora-Talavera,Teresa Del Rosario.
ABSTRACT In the present study, the hexane, acetone and methanol extracts of stem, branches and roots from Crotalaria longirostrata were evaluated for their antifungal activity against Fusarium sp., Fusarium verticillioides and Aspergillus flavus. The variables analyzed were inhibition halos, mycelial growth inhibition, sporulation and minimum inhibitory concentration. Phytochemical analysis revealed the presence of saponins, coumarins, anthrones, anthraquinones, flavonoids and alkaloids on different organic extracts. The hexane extract showed zones of inhibition between 6.3 and 10.5 mm. The mycelia growth and sporulation of A. flavus were reduced to 90% with methanol extract. The minimum inhibitory concentration values obtained with hexane extracts were...
Tipo: Journal article
Palavras-chave: Fungicidal properties; Extracts; Fusarium verticillioides; Fusarium sp.; Aspergillus flavus.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100167

Antifungal activity of medicinal plant extracts against phytopathogenic fungus Alternaria spp
Provedor de dados: 117
Autores: Díaz Dellavalle,Paola; Cabrera,Andrea; Alem,Diego; Larrañaga,Patricia; Ferreira,Fernando; Dalla Rizza,Marco.
The aim of the study was to evaluate the antifungal activity of extracts of 10 plant species used in traditional Uruguayan medicine against the phytopathogenic fungus Alternaria spp. The plants were selected on the basis of their reported ethnobotanical uses. Aqueous, saline buffer and acid extracts of different plant species were screened in vitro for their antifungal activity against Alternaria spp. For the antifungal evaluation we used a microspectrophotometric assay. Minimal inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) of the extracts were determined. Three solvents were assayed on different tissues of the plants and among the 29 evaluated extracts, 31% of the extracts inhibited growth, similar to the effects of a chemical...
Tipo: Journal article
Palavras-chave: Fungicidalproperties; Ethnobotanical uses; Uruguay.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200008

Anti-Iipase and antioxidant properties of 30 medicinal plants used in Oaxaca, México
Provedor de dados: 48
Autores: Villa-Ruano,Nemesio; Zurita-Vásquez,Guilibaldo G; Pacheco-Hernández,Yesenia; Betancourt-Jiménez,Martha G; Cruz-Durán,Ramiro; Duque-Bautista,Horacio.
We report the results of in vitro anti-lipase and antioxidant assays using crude ethanolic extracts from 30 plants grown in Oaxaca, México. Anti-lipase tests were performed by using porcine pancreatic lipase (PPL) [EC 3.1.1.3] from Affymetrix/USB. The extracts of Solanum erianthum, Salvia microphylla, Brungmansia suaveolens and Cuphea aequipetala showed up to 60% PPL inhibition. The effect of these extracts on the kinetic parameters of PPL (Km= 0.36 mM, and Vmax=0.085 mM min -1) revealed that the alcoholic preparations of S. erianthum and C. aequipetala engendered a non-competitive inhibition (Vmax=0.055 mM min -1; Vmax= 0.053 mM min -1), whereas those of S. microphylla and B. suaveolens produced a mixed inhibition (Km= 0.567 mM, Vmax=0.051 mM min _1;...
Tipo: Journal article
Palavras-chave: Phytotherapy; Anti-obesity; Antioxidant; Oaxacan ethnobotany.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000200006

Anti-inflammatory and redox-protective activities of citronellal
Provedor de dados: 48
Autores: Melo,Mônica S; Guimarães,Adriana G; Santana,Michele F; Siqueira,Rosana S; De Lima,Amanda Do Carmo B; Dias,Antonio S; Santos,Márcio Roberto V; Onofre,Alexandre S.C.; Quintans,Jullyana S.S.; De Sousa,Damião P; Almeida,Jackson R.G.S.; Estevam,Charles S; Araujo,Brancilene S; Quintans-Júnior,Lucindo J.
The anti-inflammatory and redox protective effects of the citronellal (CT) were evaluated using in vivo and in vitro tests. Intraperitoneal (i.p.) administration of CT (50, 100, and 200 mg/kg) inhibited (p &lt; 0.05) the carrageenan-induced leukocyte migration to the peritoneal cavity. Additionally, the carrageenan- and arachidonic acid-induced rat hind paw edema was significantly inhibited (p &lt; 0.05) by i.p. administration of 100 and 200 mg/kg of the compound. When the redox activity was evaluated, CT (200 mg/kg) significantly reduced hepatic lipoperoxidation (p &lt; 0.001), as well as oxidation of plasmatic (p &lt; 0.05) and hepatic (p &lt; 0.01) proteins. The results of the present study support the hypothesis that CT possesses anti-inflammatory and...
Tipo: Journal article
Palavras-chave: Monoterpene; Citronellal; Anti-inflammatory; Redox.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000400008

Anti-inflammatory components of the Vietnamese starfish Protoreaster nodosus
Provedor de dados: 48
Autores: Thao,Nguyen Phuong; Luyen,Bui Thi Thuy; Koo,Jung Eun; Kim,Sohyun; Koh,Young Sang; Cuong,Nguyen Xuan; Nam,Nguyen Hoai; Van Kiem,Phan; Kim,Young Ho; Van Minh,Chau.
BACKGROUND: In the present study, we examined the inhibitory effects of a methanolic extract, dichloromethane fraction, water layer, and polyhydroxylated sterols (1-4) isolated from the Vietnamese starfish Protoreaster nodosus on pro-inflammatory cytokine (IL-12 p40, IL-6, and TNF-&amp;#945;) production in LPS-stimulated bone marrow-derived dendritic cells (BMDCs) using enzyme-linked immunosorbent assays (ELISA). RESULTS: The methanolic extract and dichloromethane fraction exerted potent inhibitory effects on the production of all three pro-inflammatory cytokines, with IC50 values ranging from 0.60 ±0.01 to 26.19 ±0.64 &amp;#956;g/mL. Four highly pure steroid derivatives (1-4) were isolated from the dichloromethane fraction and water layer of P. nodosus....
Tipo: Journal article
Palavras-chave: Protoreaster nodosus Starfish IL-12 p40 IL-6 TNF-&amp;#945; LPS-stimulated BMDCs Anti-inflammatory.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100012

Anti-inflammatory Effect of Silymarin on Ovarian Immunohistochemical Localization of TNF- Associated with Systemic Inflammation in Polycystic Ovarian Syndrome
Provedor de dados: 77
Autores: Kayedpoor,Parvin; Mohamadi,Shima; Karimzadeh-Bardei,Latifeh; Nabiuni,Mohammad.
Tumor necrosis factor alpha (TNF-a) and interleukin (IL)-6, are prominent mediators of inflammation and have been confirmed to be elevated in at least a subgroup of women with polycystic ovary syndrome (PCOS). In this study, the effects of Silymarin (SLM) on the expression TNF-a, IL-6, CRP and symptoms of PCOS were studied. In this research, PCOS was induced by injection of Estradiol Valerate. PCOS rats were divided into control and experimental groups received intraperitoneal injection SLM extract daily. After syndrome induction, ovaries were collected for histological and immunohistochemical evaluations. Serum IL-6 was detected by the ELISA kit. The results indicated the significant reduction in inflammatory markers and significant changes follicular...
Tipo: Journal article
Palavras-chave: Immunohistochemistry; Inflammation; Silybum Marianum extract.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200054

Anti-inflammatory effects of Salvia plebeia R. Br extract in vitro and in ovalbumin-induced mouse model
Provedor de dados: 48
Autores: Hwan-Hee,Jang; Su-Yeon,Cho; Mi-Ju,Kim; Jung-Bong,Kim; Sung-Hyen,Lee; Mee-Young,Lee; Young-Min,Lee.
BACKGROUND: Asthma is an increasing global health problem, and novel strategies to prevent or ameliorate the condition are needed. Here, the effects of 80 % ethanol extracts of Salvia plebeia R. Br. (SE) on an induced inflammatory response were investigated RESULTS: Salvia plebeia R. Br. inhibited production of pro-inflammatory cytokines, such as TNF-&amp;#945; and IL-6, as well as nitric oxide (NO) in LPS-stimulated RAW 264.7 cells. NO and pro-inflammatory cytokine production was suppressed more effectively by SE of the aerial parts (SE-A) than of the roots (SE-R) of S. plebeia. In BEAS-2B cells, both SE-A and SE-R inhibited the increase in production of the inflammatory cytokines IL-6 and IL-8. We also investigated the antiasthmatic effects of SE in an...
Tipo: Journal article
Palavras-chave: Anti-inflammatory; Asthma; Salvia plebeia.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100041

Antimicrobial and molecular interaction studies on derivatives of curcumin against Streptococcus pneumoniae which caused pneumonia
Provedor de dados: 69
Autores: Li,Liang-Mei; Li,Jun; Zhang,Xiu-Ying.
Background: The antimicrobial properties and molecular interaction analysis of curcumin and its derivatives against three different strains of Streptococcus pneumoniae (Penicillin-susceptible, Penicillin-intermediate and Penicillin-resistant) are studied. Results: These properties were analyzed based on the measurement of the inhibition zone, minimum inhibitory concentration (MIC), and rate of kill revealed that curcumin monoglucoside, curcumin diglucoside and curcumin possessed strong antimicrobial properties even on the Penicillin-resistant strains. Additionally, the molecular docking simulation analyses against Penicillin Binding Protein of S. pneumoniae also confirm that these compounds docked at the active site of the enzyme. Further, the molecular...
Tipo: Journal article
Palavras-chave: Antimicrobial; Curcumin; MIC; Molecular docking; Penicillin-resistant.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100002

Antimicrobial effect of polyphenols from apple skins on human bacterial pathogens
Provedor de dados: 69
Autores: Alberto,María Rosa; Rinsdahl Canavosio,Matías Andrés; Manca de Nadra,María Cristina.
Apples possess many beneficial properties for the human health related with their high content in phenolic compounds. The antimicrobial effect of these compounds from the skin of two apple varieties, Royal Gala and Granny Smith, against human pathogens was examined. The phenolic compounds were extracted with the following solvents: A, acetone: water: acetic acid; B, ethyl acetate: methanol: water and C, ethanol: water. Total phenolic, flavonoid and non-flavonoid contents were analyzed in the extracts. The antimicrobial effect was determined using the agar diffusion method. The highest inhibitory effect of both apple varieties corresponded to extract A, which contained a high phenolic content. The Granny Smith extracts with higher phenolic content presented...
Tipo: Journal article
Palavras-chave: Bacterial inhibition; Granny Smith; Royal Gala; Pathogens; Phenolic extracts.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300006

Antimicrobial effects of plant defence peptides expressed by bovine endothelial cells on intracellular pathogens
Provedor de dados: 69
Autores: Loeza-Ángeles,Heber; López-Meza,Joel E; Ochoa-Zarzosa,Alejandra.
Background: The actions of plant antimicrobial peptides (PAP) against intracellular pathogens are poorly known. It has been reported that wheat puroindolines show antibacterial activity against Staphylococcus epidermidis endocyted by macrophages. In this work, we evaluated the intracellular antimicrobial activity of PAP gamma-thionin and thionin Thi2.1 produced by bovine endothelial cells against intracellular Staphylococcus aureus and Candida albicans. We used three host-pathogen models: 1) bovine mammary epithelial cells (BMEC)-S. aureus, 2) bovine endothelial cells (BEC)-S. aureus and 3) BEC-C. albicans, and evaluated the effect of conditioned media from BEC producers of PAP (gamma-thionin and thionin Thi2.1). Results: In the first model, conditioned...
Tipo: Journal article
Palavras-chave: Antimicrobial peptides; Arabidopsis thaliana thionin; Capsicum chinense gamma-thionin; Candida albicans; Intracellular pathogens; Staphylococcus aureus.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500001

Antimicrobial peptides: A natural alternative to chemical antibiotics and a potential for applied biotechnology
Provedor de dados: 69
Autores: Marshall,Sergio H.; Arenas,Gloria.
A large group of low molecular weight natural compounds that exhibit antimicrobial activity has been isolated from animals and plants during the past two decades. Among them, cationic peptides are the most widespread. Interestingly, the variety and diversity of these peptides seem to be much wider than suspected. In fact, novel classes of peptides with varying chemical propertiescontinue to be isolated from different vertebrate and invertebrate species, as well as from bacteria. To the early characterized peptides, mostly cationic in nature, anionic peptides, aromatic dipeptides, processed forms of oxygen-binding proteins and processed forms of natural structural and functional proteins can now be added, just to name a few. In spite of the astonishing...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300011

Antioxidant activity and protective role on protein glycation of synthetic aminocoumarins
Provedor de dados: 69
Autores: Aminjafari,Akram; Miroliaei,Mehran; Angelova,Violina T; Emamzadeh,Rahman; Djukic,Mirjana M; Djuric,Ana; Saso,Luciano.
Background: Synthesized aminocoumarins are heterocyclic compounds possessing potential for the treatment of insulin-dependent diabetes mellitus with unexplored anti-glycative action. Results: In this study 4-aminocoumarin derivatives (4-ACDs) were evaluated in vitro for antiglycation (AG) activities by using the human serum albumin (HSA)/glucose system, for 8 weeks of incubation. The glycation and conformational alteration of HSA in the presence of the tested compounds were evaluated by Congo red assay, fluorescence and circular dichroism spectroscopy. The antioxidant (AO) capacity were also tested by four different assays including: DPPH (2,2'-diphenyl-1-picrylhydrazyl radical), ABTS (2,2-azinobis (3-ethylbenzothiazoline-6-sulphonate) diammonium salt),...
Tipo: Journal article
Palavras-chave: Anti-glycation agents Diabetes; 4-Aminocoumarin derivatives Congo red Spectropolarimetry Spectrofluorimetry.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600007

Antioxidant activity of 50% aqueous - ethanol extract from Acantholippia deserticola
Provedor de dados: 48
Autores: MORALES,GLAUCO; PAREDES,ADRIÁN; SIERRA,PATRICIA; LOYOLA,LUIS A.
The antioxidant properties oí Acantholippia deserticola, a herb used in traditional northern Chilean medicine was studied using free radical - generating systems. The 50% aqueous - ethanol extract oí Acantholippia deserticola protected against non-enzymatic lipid peroxidation in microsomal membranes of rat, induced by an Fe++ - ascorbate system and measured spectrophotometrically by the TBARS test, and had strong free radical scavenging capacities on stable ABTS and DPPH radicáis. The results shows that the IC50 valué of the 50% aqueous - ethanolic extract oí A.deserticola is 18 ± 0.5 &amp;#956;g/mL in DPPH radical - scavenging, 15 ± 0.8 &amp;#956;g/mL in lipid peroxidation , Total Antioxidant Activity (TAA) is 0.95 mM of Trolox per mg/mL of extract. The...
Tipo: Journal article
Palavras-chave: Acantholippia deserticola; Northern Chilean medicinal plant; Phenolics; Free radicáis scavenging; Microsomal lipid peroxidation.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000200004

Antioxidant activity of extract from Polygonum aviculare L.
Provedor de dados: 48
Autores: HSU,CHIN-YUAN.
Free radicals induce numerous diseases by lipid peroxidation, protein peroxidation, and DNA damage. It has been reported that numerous plant extracts have antioxidant activities to scavenge free radicals. Whether Polygonum aviculare L. (Polygonaceae) has antioxidant activity is unknown. In this study, dried Polygonum aviculare L. was extracted by ethanol, and the extract was lyophilized. The antioxidant activities of extract powder were examined by free radical scavenging assays, superoxide radical scavenging assays, lipid peroxidation assays and hydroxyl radical-induced DNA strand scission assays. The results show that the IC50 value of Polygonum aviculare L. extract is 50 µg/ml in free radical scavenging assays, 0.8 µg/ml in superoxide radical scavenging...
Tipo: Journal article
Palavras-chave: Antioxidant activity; Free radical; Phenolics; Lipid peroxidation; DNA damage Polygonum aviculare L.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200010

Antioxidant activity of extract from Polygonum cuspidatum
Provedor de dados: 48
Autores: HSU,CHIN-YUAN; CHAN,YU-PEI; CHANG,JELI.
Numerous diseases are induced by free radicals via lipid peroxidation, protein peroxidation and DNA damage. It has been known that a variety of plant extracts have antioxidant activities to scavenge free radicals. Whether Polygonum cuspidatum Sieb. et Zuce has antioxidant activity is unknown. In this study, dried roots of Polygonum cuspidatum were extracted by ethanol and the extract was lyophilized. Free radical scavenging assays, superoxide radical scavenging assays, lipid peroxidation assays and hydroxyl radical-induced DNA strand scission assays were employed to study antioxidant activities. The results indicate that the IC50 value oí Polygonum cuspidatum extract is 110 µg/ml in free radical scavenging assays, 3.2 µg/ml in superoxide radical scavenging...
Tipo: Journal article
Palavras-chave: Antioxidant activity; Free radicals; Phenolics; Lipid peroxidation; DNA damage Polygonum cuspidatum.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000100002

Antioxidant and anti hyperglycemic role of wine grape powder in rats fed with a high fructose diet
Provedor de dados: 48
Autores: Hernández-Salinas,Romina; Decap,Valerie; Leguina,Alberto; Cáceres,Patricio; Perez,Druso; Urquiaga,Ines; Iturriaga,Rodrigo; Velarde,Victoria.
BACKGROUND: Metabolic syndrome is a growing worldwide health problem. We evaluated the effects of wine grape powder (WGP), rich in antioxidants and fiber, in a rat model of metabolic syndrome induced by a high fructose diet. We tested whether WGP supplementation may prevent glucose intolerance and decrease oxidative stress in rats fed with a high fructose diet. METHODS: Male Sprague-Dawley rats weighing 180 g were divided into four groups according to their feeding protocols. Rats were fed with control diet (C), control plus 20 % WGP (C + WGP), 50 % high fructose (HF) or 50 % fructose plus 20 % WGP (HF + WGP) for 16 weeks. Blood glucose, insulin and triglycerides, weight, and arterial blood pressure were measured. Homeostasis model assessment (HOMA) index...
Tipo: Journal article
Palavras-chave: Insulin resistance; Oxidative stress; Metabolic syndrome; Wine grape powder.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100053

Antioxidant and anticholinesterase investigations of Rumex hastatus D. Don: potential effectiveness in oxidative stress and neurological disorders
Provedor de dados: 48
Autores: Ahmad,Sajjad; Ullah,Farhat; Ayaz,Muhammad; Sadiq,Abdul; Imran,Muhammad.
BACKGROUND: Rumex species are traditionally used for the treatment of neurological disorders including headache, migraine, depression, paralysis etc. Several species have been scientifically validated for antioxidant and anticholinestrase potentials. This study aims to investigate Rumex hastatus D. Don crude methanolic extract, subsequent fractions, saponins and flavonoids for acetylcholinestrase, butyrylcholinestrase inhibition and diverse antioxidant activities to validate its folkloric uses in neurological disorders. Rumexhastatus crude methanolic extract (Rh. Cr), subsequent fractions; n-hexane (Rh. Hex), chloroform (Rh. Chf), ethyl acetate (Rh. EtAc), aqueous fraction (Rh. Aq), crude saponins (Rh. Sp) and flavonoids (Rh. Fl) were investigated against...
Tipo: Journal article
Palavras-chave: Ethnomedicinal; Acetylcholinesterase; Butyrycholinesterase; DPPH; ABTS.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100020

Antioxidant and Hypoglycemic Effects of Momordica cochinchinensis Spreng: (Gac) Aril Extract on Reproductive Damages in Streptozotocin (STZ)-Induced Hyperglycemia Mice
Provedor de dados: 77
Autores: Sampannang,Apichakan; Arun,Supatcharee; Sukhorum,Wannisa; Burawat,Jaturon; Nualkaew,Somsak; Maneenin,Chanwit; Sripanidkulchai,Bungorn; Iamsaard,Sitthichai.
The aim of present study was to investigate the effect of Momordica cochinchinensis (Gag) aril (GA) aqueous extract on male reproductive system of streptozotocin (STZ)-induced hyperglycemia (HG) mice. GA were extracted with distilled water (DW) and analyzed for in vitro antioxidant capacities. ICR male mice were divided into 7 groups: 1) control, 2) DW, 3) GA 1000 mg/kg BW, 4) HG, 5) HG + glibenclamide, 6 and 7) HG + GA 500 and 1000 mg/kg BW respectively (7 mice/ group). In HG groups, mice were induced by STZ at single dose (150 mg/kg BW). They were treated for consecutive 35 days. All groups were compared for blood glucose levels, weights and histopathologies of reproductive organs, sperm concentration including testicular tyrosine phosphorylation protein...
Tipo: Journal article
Palavras-chave: Momordica cochinchinensis aril; Streptozotocin (STZ); Testicular damage; Testicular tyrosine phosphorylated protein; Hyperglycemia (HG) mice.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200046

Antioxidant, Antibacterial activity and Brine shrimp toxicity test of some Mountainous Lichens from Nepal
Provedor de dados: 48
Autores: Paudel,Babita; Datta Bhattarai,Hari; Prasad Pandey,Durga; Seoun Hur,Jae; Gyu Hong,Soon; Kim,Il-Chan; Han Yim,Joung.
A total of twenty four lichen species belonging to six families were collected from mountainous region of Nepal. The methanol extracts of each species were tested for antimicrobial and antioxidant activitiesin vitro. It was found that extracts of twenty one lichen species were active againstB. subtilis and seven species were active againstS. aureus. Similarly, in DPPH assay, three speciesPeltigera sp.,Cladonia sp., andCanoparmelia sp. showed comparable activity with commercial standard, BHA. In ABTS+ assay, extracts ofParmoterma sp.,Ramalina sp.,Peltigera sp. andCladonia sp. showed stronger activity than ascorbic acid. The observed data after comparison with previously published reports indicated that the high altitude lichens contain stronger antioxidant...
Tipo: Journal article
Palavras-chave: Antibacterial; Antioxidant; Nepal lichens; Free radicals.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000400010

Antioxidant, antimicrobial, toxicity and analgesic properties of ethanol extract of Solena amplexicaulis root
Provedor de dados: 48
Autores: Kabir,Md Golam; Rahman,Md Monsor; Ahmed,Nazim Uddin; Fakruddin,Md; Islam,Saiful; Mazumdar,Reaz Mohammad.
BACKGROUND: This study was subjected to investigate different pharmacological properties of ethanol extract ofSolena amplexicaulis root. RESULTS: The extract contains flavonoid, alkaloid, saponin and steroid compounds. The extract exhibited excellent antioxidant activity in DPPH radical scavenging activity. The extract also showed potent activity in brine shrimp lethality bioassay. The LC50 value was found to 44.677 µg/ml. The extract showed better anti-bacterial activity against gram-negative bacteria. In antifungal assay, the maximum 79.31% of anti-mycotic activity was observed against Aspergillus ochraceus while minimum 44.2% against Rhizopus oryzae. MIC value ranged between 1500 - 3000 µg/ml. The extract was found moderately toxic with a 24-hr LD50...
Tipo: Journal article
Palavras-chave: Solena amplexicaulis; Antioxidant; Antimicrobial; Acute toxicity.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100036

Antioxidant Capacity and Acute Testicular Toxicity of Leucaena leucocephala Aqueous Shoot Tips Plus Young Leaves Extracts
Provedor de dados: 77
Autores: Burawat,Jaturon; Uabandit,Nongnut; Sripanidkulchai,Bungorn; Nualkaew,Somsak; Iamsaard,Sitthichai.
This study aimed to determine the antioxidant capacity of the Leucaena leucocephala aqueous shoot tips plus young leaves (LL-spl) extracts among three different fractions (LL-spl 10, 20, and 40 min) and to examine its acute toxicity on male reproductive parameters. The amount of the total phenolics in LL-spl extract was determined using a Folin-Ciocalteu reagent method and its antioxidant capacity was analyzed using 1, 1-diphenyl l-2-picrylhydrazyl radical scavenging and ferric reducing antioxidant powder methods. The LL-spl extract fraction with highest antioxidant capacity was used in animal treating. Male rats were divided into three groups (n= 5); control and groups treated with LL-spl 400 and 600 mg/Kg body weight for consecutive 40 days. The results...
Tipo: Journal article
Palavras-chave: Leucaena leucocephala; Shoot tips plus young leaves; Antioxidant capacity; Acute testicular toxicity.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200018

Antioxidant Capacity and Total Phenolic Compounds of Twelve Selected Potato Landrace Clones Grown in Southern Chile
Provedor de dados: 117
Autores: Ah-Hen,Kong; Fuenzalida,Carolina; Hess,Susan; Contreras,Andrés; Vega-Gálvez,Antonio; Lemus-Mondaca,Roberto.
Colored potatoes (Solanum tuberosum L.) provide a natural source of phytochemicals that help reduce the risk of diseases. However, there is a lack of information on the degree of variation of the antioxidant activity and polyphenolic contents of these native potatoes. Thus, the antioxidant activity (AA) and total phenolic content (TPC) of native Chilean potatoes were determined. Twelve potato landrace clones collected from established cultivations on Chiloe Island and Valdivia were selected. Total phenolic content and AA were compared with two commercial varieties, Shepody and Desirée. Total phenolic content was determined by the Folin-Ciocalteu method, and &amp;#946;-carotene bleaching was used to compare AA. The TPC varied in the peeled potato samples...
Tipo: Journal article
Palavras-chave: Chilean potatoes antioxidant activity total phenolics Folin-Ciocalteu &amp;#946; -carotene.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100001

Antioxidant Capacity, Anthocyanins, and Total Phenols of Wild and Cultivated Berries in Chile
Provedor de dados: 117
Autores: Guerrero C,Jaime; Ciampi P,Luigi; Castilla C,Andrea; Medel S,Fernando; Schalchli S,Heidi; Hormazabal U,Emilio; Bensch T,Emma; Alberdi L,Miren.
It is possible to incorporate a lot of natural antioxidants into the human organism by consuming berries which can prevent diseases generated by the action of free radicals. Antioxidants neutralize free radicals and thus protect the organism from the oxidative damage of lipids, proteins, and nucleic acids. Berries stand out as one of the richest sources of antioxidant phytonutrients among various fruits and vegetables. The objective of this research was to determine antioxidant capacity (AC), total anthocyanins (TA), and total phenols (TP) of wild and cultivated berries in different localities of La Araucanía and Los Ríos Regions in Chile. These parameters were analyzed by using the free radical 2,2-diphenyl-1-picrylhydrazyl hydrate (DPPH) method,...
Tipo: Journal article
Palavras-chave: ; 2-diphenyl-1-picrylhydrazyl antioxidant potential.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000400002

ANTIOXIDANT COMPOUNDS IN SKIN AND PULP OF FRUITS CHANGE AMONG GENOTYPES AND MATURITY STAGES IN HIGHBUSH BLUEBERRY (Vaccinium corymbosum L.) GROWN IN SOUTHERN CHILE
Provedor de dados: 126
Autores: Ribera,A.E; Reyes-Diaz,M; Alberdi,M; Zuñiga,G.E; Mora,M.L.
We evaluated the genotype and maturity effects on antioxidant activity and phenolic compounds of whole, skin and pulp fruits from three highbush blueberry cultivare (cv. Brigitta, cv. Bluegold and cv. Legacy) grown in southern Chile. Total antioxidant activity (TAA) in ripe fruits varied among the cultivare in the order Legacy &gt; Brigitta &gt; Bluegold. We found that TAA in unripe green and fully ripe fruits was high and similar between them, whereas the lowest levels were found in intermediate ripe fruits. The same trend was observed for fruit total phenolic content. This could be attributed to the higher concentrations of phenolic acids (mainly chlorogenic acid) and flavonols (mainly rutin) at immature fruit stages; whereas the high TAA in mature...
Tipo: Journal article
Palavras-chave: Vaccinium corymbosum; Antioxidant compounds; Maturity stages; Phenolics; Anthocyanins.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000200010

Antioxidant effect of 5-amino salicylic acid on copper-mediated LDL oxidation
Provedor de dados: 48
Autores: LÓPEZ-ALARCÓN,CAMILO; SPEISKY,HERNÁN; LISSI,EDUARDO.
The antioxidant effect of 5-Aminosalicylic acid (5-ASA) on copper-mediated LDL oxidation was followed either by the emitted chemiluminiscence (CL) or by UV-vis spectroscopy. 5-ASA addition extends the lag phase in a concentration-dependent manner without changes in the rate of the process in the autoaccelerated phase. The antioxidant behavior of 5-ASA was very similar to that of Trolox, a very efficient water soluble antioxidant. The copper-binding capacity of 5-ASA was evaluated by UV-visible spectroscopy. The addition of copper to a 5-ASA solution increases the absorbance at 332 nm and generates a new band at 298 nm. These changes in the UV-vis spectra indicate formation of a complex between 5-ASA and copper. However, LDL protection by 5-ASA is unrelated...
Tipo: Journal article
Palavras-chave: 5-Aminosalicylic acid; Antioxidant; LDL oxidation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000200006

Antioxidant Effects of Protocatechuic Acid, Ferulic Acid, and Caffeic Acid in Human Neutrophils Using a Fluorescent Substance
Provedor de dados: 77
Autores: Hyogo,Akiyo; Kobayashi,Toshihiro; Garcia del Saz,Eva; Seguchi,Harumichi.
Human neutrophils stimulated by phorbol myristate acetate (PMA), an activator of protein kinase C, produce active oxygen by NADPH oxidase in intracellular structures. We added succinimidyl ester of dichlorodihydrofluorescein diacetate (H2DCFDA), which first emits fluorescence when oxidized with active oxygen species, to neutrophils to produce active oxygen, in order to investigate the antioxidant effects of protocatechuic acid, ferulic acid, and caffeic acid which belong to polyphenols and are widely distributed among plants. Particularly, we focused on examining whether these substances capture and eliminate active oxygen inside or outside the neutrophil cytoplasm and whether these substances inhibit NADPH oxidase. Fluorescence microscopy demonstrated...
Tipo: Journal article
Palavras-chave: Antioxidant effects; Polyphenols; Human neutrophils; Flow cytometry.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300040

Antioxidant flavonols from fruits, vegetables and beverages: measurements and bioavailability
Provedor de dados: 48
Autores: CROZIER,ALAN; BURNS,JENNIFER; AZIZ,AZLINA A; STEWART,AMANDA J; RABIASZ,HELENA S; JENKINS,GARETH I; EDWARDS,CHRISTINE A; LEAN,MICHAEL EJ.
Flavonols are polyphenolic secondary plant metabolites that are present in varying levels in commonly consumed fruits, vegetables and beverages. Flavonols have long held an interest for nutritionists, which has increased following a Dutch study in the early 1990’s showing that dietary intake of flavonols was inversely correlated with the incidence of coronary heart disease. The main factors that have hindered workers in the field of flavonol research are (i) the accurate measurement of these compounds in foods and biological samples, and (ii) a dearth of information on their absorption and metabolism. This review aims to highlight the work of the authors in attempting to clarify the situation. The sensitive and selective HPLC procedure to identify and...
Tipo: Journal article
Palavras-chave: Bioavailability; Dietary antioxidants; Flavones; Flavonols; HPLC analysis.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200007

Antioxidant isolated from Schisandra propinqua (Wall.) Baill
Provedor de dados: 48
Autores: HUANG,FENG; XU,LIJIA; GANGGANG,SHI.
Schisandra propinqua (Wall.) Baill.(Schisandraceae) is widely used as a Chinese folk medicine. In this study, activity-guided fractionation of the ethanol extract from the stem of Schisandra propinqua led to the isolation of four extracts. Subsequently, a neolignan 4,4-di(4-hydroxy-3-methoxyphenly)-2,3-dimethylbutanol was isolated from the EtOAc part of the stem of Schisandra propinqua, the free radical scavenging activities of which were researched in vitro. The present work demonstrated that extracts and pure compound possessed scavenging activities to DPPH, superoxide anions and hydroxy radical, and could depress lipid peroxidation reaction induced by oxygen radical produced by the Fe2+/cysteine system in vitro. This suggests that the traditional...
Tipo: Journal article
Palavras-chave: Antioxidant; Free radical; Lipid peroxidation; Schisandra propinqua.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300009

Antioxidant Mechanisms of Polyphenolic Caffeic Acid Oligomers, Constituents of Salvia officinalis
Provedor de dados: 48
Autores: BORS,WOLF; CHRISTA,MICHEL; STETTMAIER,KURT; YINRONG,LU; L. YEAP,FOO.
Caffeic acid, rosmarinic acid and oligomers of caffeic acid with multiple catechol groups are all constituents of Salvia officinalis. Their antioxidant potential was investigated with regard to their radical scavenging activity and the stability and structure of the intermediate radicals. Pulse-radiolytic studies revealed very high rate constants with hydroxyl radicals. Evidence from kinetic modeling calculations suggested an unusual complex behavior due to the presence of both O4- and O3-semiquinones and formation and decay of a hydroxyl radical adduct at the vinyl side chain. The radical structures observed by EPR spectroscopy after autoxidation in slightly alkaline solutions were only partially identified due to their instability and generally...
Tipo: Journal article
Palavras-chave: Caffeic acid oligomer; Catechol semiquinone; Electron paramagnetic resonance; Hydroxyl radical; Kinetic modeling; Pulse radiolysis; Salvia officinalis.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200017

Antioxidant properties and color of Hibiscus sabdariffa extracts
Provedor de dados: 118
Autores: Salazar-González,Claudia; Vergara-Balderas,Fidel T; Ortega-Regules,Ana E; Guerrero-Beltrán,José Á.
Liquid extracts of dried Roselle (Hibiscus sabdariffa) calyces obtained using ethanol:water (50:50 and 70:30%, v/v), water, ethanol:1.5 N HCl (85:25%, v/v), and ethanol (96%) to evaluate selected antioxidant characteristics (phenolic compounds and antioxidant capacity), color parameters (L, a, and b), and anthocyanins (delphinidin-3-O-sambubioside, delphinidin-3-O-glucoside (myrtillin), and cyanidin-3-O-sambubioside) by high performance liquid chromatography (HPLC). The total monomeric anthocyanin content was also assessed using the differential pH technique. The phenolic compound content ranged from 1,067±22 (in ethanol) to 2,649±96 (in ethanol:water 70:30%) mg of gallic acid100 g-1 of dehydrated calyces, and the antioxidant capacity ranged from 3.11±0.50...
Tipo: Journal article
Palavras-chave: Anthocyanins; Antioxidant capacity; Cyanidin-3-O-sambubioside; Delphinidin-3-O-sambubioside; Delphinidin-3-O-glucoside; Myrtillin; Hibiscus sabdariffa; Roselle calyces.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100006

Antioxidant Properties and Total Phenolic Content of Eight Salvia Species from Turkey
Provedor de dados: 48
Autores: TOSUN,MURAT; ERCISLI,SEZAI; SENGUL,MEMNUNE; OZER,HAKAN; POLAT,TASKIN; OZTURK,ERDOGAN.
Methanolic extracts of eight Salvia species, namely S. aethiopis, S. candidissima, S. limbata, S. microstegia, S. nemorosa, S. pachystachys, S. verticillata, and S. virgata, sampled from Eastern Anatolia in Turkey, were screened for their possible antioxidant activities by two complementary test systems, namely DPPH free radical scavenging and b-carotene/linoleic acid. Total phenolic content of the extracts of Salvia species were performed Folin-Ciocalteu reagent and gallic acid used as standard. A wide variation has been observed among species in terms of antioxidant activity and total phenolic content. In both DPPH and b-carotene system, the most active plant was Salvia verticillata with a value of IC50=18.3 &amp;#956;g/ml and 75.8%, respectively. This...
Tipo: Journal article
Palavras-chave: Sage; Salvia; Total phenolic content.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200005

Antioxidant responses of cortex neurons to iron loading
Provedor de dados: 48
Autores: AGUIRRE,PABLA; MENA,NATALIA; TAPIA,VICTORIA; ROJAS,ALEJANDRO; ARREDONDO,MIGUEL; NÚÑEZ,MARCO TULIO.
Brain cells have a highly active oxidative metabolism, yet they contain only low to moderate superoxide dismutase and catalase activities. Thus, their antioxidant defenses rely mainly on cellular reduced glutathione levels. In this work, in cortical neurons we characterized viability and changes in reduced and oxidized glutathione levels in response to a protocol of iron accumulation. We found that massive death occurred after 2 days in culture with 10 mM Fe. Surviving cells developed an adaptative response that included increased synthesis of GSH and the maintenance of a glutathione-based reduction potential. These results highlight the fundamental role of glutathione homeostasis in the antioxidant response and provide novel insights into the adaptative...
Tipo: Journal article
Palavras-chave: Glutathione; Iron; Redox response; Cortical neurons; Cell death.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100012

Anti-peptide antibodies: A tool for detecting IL-8 in salmonids
Provedor de dados: 69
Autores: Santana,Paula; Palacios,Claudia; Narváez,Edgar; Guzmán,Fanny; Gallardo,José A; Mercado,Luis.
Background: Interleukin 8 is a chemokine that is produced by several types of cells, like macrophages and has chemotactic activity in particular on neutrophils, playing a key role during the inflammatory process. It has been demonstrated at the molecular level that this molecule is present and conserved in several vertebrate groups, pointing its importance. Analysis of the amino acid sequence of IL-8, projected from cDNA of Salmo salar, presents homology with the sequences of mammals, poultry and lamprey, indicating the presence of a homologous molecule in higher fish. However, there is no information at protein level, which allows characterizing the regulatory role of this molecule during the immune response in fish. Results: In this work, we designed and...
Tipo: Journal article
Palavras-chave: Anti-IL-8; Fish antibodies; Fish chemokine; Rainbow trout; Synthetic peptide epitope.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500020

Anti-Proliferative Activities of Centella Asiatica Extracts on Human Respiratory Epithelial Cells in vitro
Provedor de dados: 77
Autores: Mutua,P. M; Gicheru,M. M; Makanya,A. N; Kiama,S. G.
Centella asiatica or "pegaga" is well known for its ability in promoting wound healing. This study focused on the effect of Centella asiatica on the proliferation of human respiratory epithelial (RE) cells. RE cells were cultured using co-culture techniques until first passage (P1). Viability cell test by tryphan blue dye exclusion assay showed that there was high percentage of cell viability at both P0 (74%) and P1 (91.61%). Triplicate MTT assays were carried out with different concentrations of C. asiatica from 15.6 ppm, 31.3 ppm, 62.5 ppm, 125 ppm, 250 ppm, 500 ppm, 1000 ppm, until 2000 ppm. The higher the concentration of C. asiatica, the more inhibitory effect was seen. C. asiatica aqueous extract at concentration 1000 ppm and 2000 ppm demonstrated a...
Tipo: Journal article
Palavras-chave: Centella asiatica; Respiratory epithelial cells; Anti-proliferative.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400028

Antiproliferative evaluation of tall-oil docosanol and tetracosanol over CHO-K1 and human melanoma cells
Provedor de dados: 69
Autores: Vergara,Mauricio; Olivares,Araceli; Altamirano,Claudia.
Background Polycosanols derived from plant species have traditionally been used in medicine as antiproliferative agents for treating various viruses (primarily the herpes simplex virus). However, few studies have studied their effects on hyperproliferative cell lines. In this work, the antiproliferative capacity of polycosanols from tall-oil pitch, obtained from black liquor soaps in the kraft pulping process of cellulose (specifically from Pinus radiata, Pinus taede, and Eucalyptus globulus), was evaluated on CHO-K1 and CRL-1974 human melanoma cell lines. Results The proliferative capacities and cell viabilities were measured for 72 and 140 h, respectively. Treatment with docosanol produced differential effects on the CHO-K1 and human melanoma cells and...
Tipo: Journal article
Palavras-chave: CHO-K1 cells; Growth-arrested; Human melanoma cells; Polycosanols.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400006

Antitumor Activities of Iodoacetate and Dimethylsulphoxide Against Solid Ehrlich Carcinoma Growth in Mice
Provedor de dados: 48
Autores: FAHIM,FAWZIA A  ; ESMAT,AMR Y; MADY,ESSAM A; IBRAHIM,EMAD K.
Treatment of tumor-bearing mice with LD12.5 values of iodoacetate; IAA (1.84 mg/100g b.w.) and/or dimethylsulphoxide; DMSO (350 mg/ 100g b.w.) significantly increased the cumulative mean survival time and percentage of survivors and reduced the mean tumor weight, compared to tumor-bearing controls, however, a more pronounced effect is recorded in the combined treatment. Also, an increase in the life span (ILS%) and tumor growth inhibition ratio (T/C%) are reported and amounted to 145.78 and 43.80%, 195.54 and 61.30% and 220.77 and 78.40% in IAA, DMSO and combined-treated groups, respectively. Results obtained from biochemical studies reveal that a single IAA treatment of tumor-bearing mice significantly increased the levels of plasma lactate dehydrogenase...
Tipo: Journal article
Palavras-chave: Antioxidant enzymes; Carbohydrate metabolism dimethylsulphoxide; Iodoacetate; Solid Ehrlich carcinoma.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000200015

Antitumor and anti-angiogenic potentials of isolated crude saponins and various fractions of Rumexhastatus D. Don
Provedor de dados: 48
Autores: Ahmad,Sajjad; Ullah,Farhat; Ayaz,Muhammad; Zeb,Anwar; Ullah,Farman; Sadiq,Abdul.
BACKGROUND: Cancer, being the foremost challenge of the modern era and the focus of world-class investigators, gargantuan research is in progress worldwide to explore novel therapeutic for its management. The exploitation of natural sources has been proven to be an excellent approach to treat or minify the excessive angiogenesis and proliferation of cells. Similarly, based the ethnomedicinal uses and literature survey, the current study is designed to explore the anti-tumor and anti-angiogenic potentials of Rumex hastatus. Anti-tumor and anti-angiogenic activities were carried out using potato-disc model and chorioallantoic membrane (CAM) assay respectively. Moreover, R. hastatus was also assessed for antibacterial activity against Agrobacterium...
Tipo: Journal article
Palavras-chave: Rumex hastatus; Agrobacterium tumefaciens; Saponins; Angiogenesis; Tumor.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100018

Antitumor compounds from Streptomyces sp. KML-2, isolated from Khewra salt mines, Pakistan
Provedor de dados: 48
Autores: Aftab,Usman; Zechel,David L.; Sajid,Imran.
BACKGROUND: Actinomycetes are gram positive bacteria with high G + C content in their DNA and are capable of producing variety of secondary metabolites. Many of these metabolites possess different biological activities and have the potential to be developed as therapeutic agents. The aim of the present study was to screen actinomycetes inhabiting halophilic environment such as Khewra salt mines present in Pakistan for cytotoxic and antitumor compounds RESULTS: An actiomycetes strain designated as Streptomyces sp. KML-2 was isolated from a saline soil of Khewra salt mines, Pakistan. The strain Streptomyces sp. KML-2 showed 84 % cytotoxic activity against larvae of Artemiasalina. In the screening phase, the strain exhibited significant antitumor activity...
Tipo: Journal article
Palavras-chave: Streptomyces sp KML-2 Antitumor activity Chromomycin SA 1-(1 H-indol-3-yl)-propane-1; 2; 3-triol.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100058

Antitumor function and mechanism of phycoerythrin from Porphyra haitanensis
Provedor de dados: 48
Autores: Pan,Qunwen; Chen,Meizhen; Li,Juan; Wu,Yan; Zhen,Chao; Liang,Bin.
The anti-tumor effect of R-Phycoerythrin (R-PE) from Porphyra haitanensis was studied using cell line HeLa as an in vitro model and Sarcoma-180 (S180) tumor-bearing mice as an in vivo model. The results showed that the combination treatment of R-PE and photodynamic therapy PDT) significantly inhibited the growth of HeLa cells up to 81.5%, with a fair dose-effect relationship, but did not inhibit endothelial cells. The annexin v-fitc/PI fluorescence staining experiments demonstrated that at doses between 0~60µg/mL, apoptosis cells and later stage apoptosis cells or necrosis cells increased significantly as the R-PE dosage increased. DNA electrophoresis showed that after R-PE+PDT treatment of HeLa cells for 24 hours, a light "smear" band between 100~400bp...
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000100013

Antiulcer activity of ethanolic extract of Encholirium spectabile Mart. ex Schult &amp;amp; Schult f. (Bromeliaceae) in rodents
Provedor de dados: 48
Autores: Moraes de Carvalho,Katharinne I; Fernandes,Hélio B; Frota Machado,Flávia D; Oliveira,Irisdalva S; Oliveira,Francisco A; Nunes,Paulo Humberto M; Lima,Julianeli T; Silva Almeida,Jackson R G; Meneses Oliveira,Rita C.
This study evaluated the antiulcer activity of an ethanolic extract of Encholirium spectabile (ES-EtOH) by using different standard experimental models of induced acute gastric ulceration. ES-EtOH (100 mg/kg p.o) protected the gastric mucosa against ulceration that was induced by absolute ethanol (53%), ethanol/HCl (75 %), ibuprofen (52 %) and ischemia/reperfusion (43 %). It also restored catalase activity and non-protein sulfhydryl group concentration in the gastric wall of mice that had been treated with ethanol. The pre-treatment of mice with N-nitro-L-arginine (70 mg/kg i.p.) abolished the protective activity of ES-EtOH, which indicates that prostaglandins, antioxidant compounds and nitric oxide synthase activity are involved in the gastroprotective...
Tipo: Journal article
Palavras-chave: Antioxidant; Antiulcer activity; Encholirium spectabile; Bromeliaceae.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000400011

Antropometría, Composición Corporal y Somatotipo de las Patinadoras de Elite en Patinaje Artístico sobre Ruedas: Análisis por Disciplinas
Provedor de dados: 77
Autores: Vila Suárez,María Helena; Manchado López,Carmen; Ferragut Fiol,Carmen.
El objetivo de este estudio fue describir y comparar las características antropométricas, composición corporal y somatotipo de patinadoras de patinaje artístico sobre ruedas por categorías (junior y senior) y por disciplinas (individual, parejas y danza). Fueron evaluadas 62 patinadoras profesionales (36 en la disciplina de libre, 13 en danza y 13 en parejas). El análisis estadístico utilizado fue una ANOVA para muestras independientes entre disciplinas, y una T de Student para las categorías (junior y senior). Entre la categoría junior y senior no se han encontrado diferencias estadísticas significativas. Las patinadoras junior presentaron un somatotipo endo-mesomorfo, y las patinadoras senior presentaron un somatotipo mesomorfo balanceado. El somatotipo...
Tipo: Journal article
Palavras-chave: Mujeres; Elite; Disciplina danza; Disciplina individual; Disciplina parejas; Porcentaje graso.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300051

Antropometría del Estribo en Humanos: Un Estudio Anatómico Directo
Provedor de dados: 77
Autores: Ramirez,L. M; Ballesteros,L. E.
Es modesta la base de datos morfológicos del estribo en humanos. Su caracterización morfométrica es importante cuando se compara con estribos de otras épocas ancestrales e igualmente en el estudio de una biomecánica oscicular compleja. Las características estructurales y dimensionales y pareadas del estribo fueron registradas en 23 huesos de población mestiza adulta Colombiana. Las medidas registradas involucraron el área de la articulación lenticular incudo-estapedial, la platina del estribo y los procesos anterior y posterior del estribo, en diferentes sentidos. Cinco de los dieciséis registros tomados en este estudio pudieron ser comparados concienzudamente con otros estudios. Las cinco medidas comparables fueron: el largo total de la platina con 2,87...
Tipo: Journal article
Palavras-chave: Oscículos; Estribos; Platina; Articulación lenticular; Articulación incudo-estapedial; Proceso anterior del estribo; Proceso posterior del estribo.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400007

Antropometría del Martillo en Humanos: Un Estudio Anatómico Directo
Provedor de dados: 77
Autores: Ramirez,L. M; Ballesteros,L. E.
El conocimiento morfométrico de las estructuras del oído medio, incluidos cada uno de los oscículos, es importante para la comprensión de su complejidad biomecánica. Las características estructurales y dimensionales del martillo son registradas en 23 martillos de población mestiza adulta Colombiana. Las medidas registradas involucran el área de la cabeza, el cuello, el manubrio, el proceso anterior y lateral y el área de la articulación incudo-maleolar. Tres de los diecinueve registros tomados en este estudio pudieron ser comparados concienzudamente con otros estudios que mostraron similitudes. El largo total del martillo fue de 8,18 mm DE 0,24, la longitud del manubrio fue de 4,91 mm DE 0,25 y la proporción del largo del manubrio y el largo total fue de...
Tipo: Journal article
Palavras-chave: Oscículos; Martillo; Manubrio; Antropometría; Anatomía.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100030

Antropometría del Yunque y Articulaciones Incudo-maleolar e Incudo-estapedial en Humanos: Un Estudio Anatómico Directo
Provedor de dados: 77
Autores: Ramirez,Luis Miguel; Ballesteros,Luis Ernesto.
Los estudios actuales sobre variaciones anatómicas del yunque en humanos a partir del registro morfométrico son insuficientes. Las características estructurales y dimensionales del yunque son registradas en 23 muestras de población mestiza adulta Colombiana. Las medidas registradas involucraron el cuerpo, la articulación incudo-maleolar, el proceso largo, el proceso corto y la articulación incudo-estapedial. Solo ocho de los treinta y cinco registros tomados en este estudio pudieron ser comparados concienzudamente con otros estudios anteriores que mostraron similitudes. El largo total del yunque fue de 6,51 mm (DE 0,32), la longitud del proceso largo del yunque fue de 5,35 mm (DE 0,25), la distancia entre proceso largo y corta fue de 6,06 mm (DE 0,35) y la...
Tipo: Journal article
Palavras-chave: Oscículos; Yunque; Articulación incudo-maleolar; Proceso largo; Proceso corto; Articulación incudo-estapedial.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200030

Anuran larvae as prey and hosts of invertebrates in neotropical aquatic habitats
Provedor de dados: 97
Autores: Gambale,Priscilla Guedes; Batista,Vinícius Guerra; Oda,Fabrício Hiroiuki; Campos,Renata Mayara; Takemoto,Ricardo Massato; Bastos,Rogério Pereira.
BACKGROUND: Biotic processes, such as predation and parasitism events, are crucial for answering questions in ecology and evolution. Here, we report predation and ectoparasitism events of invertebrates upon tadpoles in aquatic habitats of southern Brazil. FINDINGS: Four lentic water bodies were sampled twice a month (December 2012 to March 2013). Those water bodies were located in the Diamante do Norte County, State of Paraná, southern Brazil. The tadpoles, Dendropsophus aff. minutus, Hypsiboas raniceps, Scinax fuscovarius, Physalaemus cuvieri and Elachistocleis bicolor were observed being predated by six different invertebrate predators. However, Leptodactylus fuscus and Pseudis sp. were also recorded on the same water bodies and were not observed being...
Tipo: Journal article
Palavras-chave: Tadpoles; Anura; Predation; Parasitism; Brazil.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100026

Aparición de Melanina como Pigmento Protector en el Encéfalo de Xenopus laevis para Protegerlo de los Efectos de la Radiación Ultravioleta
Provedor de dados: 77
Autores: Díaz Murillo,H; Pedemonte Campos,C.
Con el fin de proteger al organismo de condiciones estresantes, tales como cambios de osmolaridad y de temperatura, además de actuar como pantalla protectora en contra de los rayos ultravioleta (UV). Se ha observado que ciertos anfibios han desarrollado pigmentación en su encéfalo como una posible protección ante el aumento de la radiación UV, causada por el daño en la capa de ozono, la cual estaría alterando al ecosistema. En este trabajo se describe la presencia de pigmentación en el encèfalo de X. laevis durante el desarrollo larvario y su posible función protectora frente a la radiación UV. Para ello, se recolectaron individuos de diferentes estados larvarios, los que fueron obtenidos de distintas localidades de la región de Valparaíso (V región,...
Tipo: Journal article
Palavras-chave: Melanina; Radiación ultravioleta; Xenopus laevis.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300055

Apéndices Testicular y Epididimario en Individuos Brasileños
Provedor de dados: 77
Autores: Sousa-Rodrigues,C. F; da Silva,I. R. A; Alves,M. V; Barbosa,F. T; del Sol,M; Olave,E; Ferreira-Rodrigues,A. K. B; Ribeiro,E. A. N.
Los apéndices testiculares y epididimarios son remanescentes embriológicos del conducto paramesonéfrico y del conducto mesonéfrico, respectivamente. Estos apéndices pueden sufrir torsión causando un cuadro conocido como escroto agudo. El presente trabajo tuvo como objetivo determinar las variaciones de los apéndices testicular y epididimario, registrando su forma y tamaño. Se utilizaron 30 cadáveres de indivíduos adultos, Brasileños, con edades comprendidas entre 18 y 70 años, fijados en formaldehído 40%, facilitados por el Laboratorio de Anatomía Descriptiva y Topográfica de la Universidad Federal de Alagoas (UFAL), Maceió, Brasil. A través de disección se identificó la presencia de los respectivos apéndices, los que fueron medidos con un caliper manual...
Tipo: Journal article
Palavras-chave: Anatomía; Testículo; Epidídimo; Apéndices; Torsión testicular.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300014

Apical Maxi-chloride channel from human placenta: 12 years after the first electrophysiological recordings
Provedor de dados: 48
Autores: RIQUELME,GLORIA.
The Maxi-chloride channel was the first ion channel described by electrophysiological methods in placenta. Because it is difficult to access a complex epithelium such as the placenta for electrophysiological procedures, the studies of ion channels from placental membranes have been performed only very recently. It was only in 1993 that a direct demonstration of a high-conductance chloride channel in apical membranes of intact trophoblastic epithelium was mentioned, and two years later, the description of this channel was reported from purified placental apical membranes reconstituted into artificial lipid membranes suitable for patch-clamp recordings. This brief review comments on the work done with regard to the electrophysiological characterization and...
Tipo: Journal article
Palavras-chave: Apical membrane; Chloride channel; Human placenta.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000300006

Aplicación de la Norma Chilena Oficial de denominación de origen botánico de la miel para la caracterización de la producción apícola
Provedor de dados: 118
Autores: Montenegro,Gloria; Gómez,Miguel; Díaz-Forestier,Javiera; Pizarro,Rodrigo.
La producción apícola chilena se caracteriza por una gran variedad de tipos de mieles, con una alta participación de especies vegetales nativas, las que les otorgan cualidades particulares, debido al alto endemismo de su flora. Alrededor del 95% de la miel producida en Chile es exportada a granel, sin ningún valor agregado, lo que equivale al 1% de participación en el mercado de exportación melífera. Como es imposible tener alguna ingerencia en el comercio mundial de este producto, se hace necesario mejorar la competitividad diferenciando la producción y convirtiéndola en un producto particular, con características únicas. Un avance importante en este sentido ha sido el establecimiento de un sistema de trazabilidad y la implementación de la Norma Chilena...
Tipo: Journal article
Palavras-chave: Abeja; Miel; Origen botánico; Tipificación; Mieles chilenas.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200007

APLICACIÓN DE LODOS DE PLANTA DE TRATAMIENTO DE CELULOSA: EFECTO EN ALGUNAS PROPIEDADES FÍSICAS Y QUÍMICAS DE SUELOS VOLCÁNICOS
Provedor de dados: 127
Autores: Aravena R,Claudia; Valentin C,Cristian; Diez J,M. Cristina; Mora G,M de la Luz; Gallardo A,Felipe.
Los lodos de planta de tratamiento de celulosa son ricos en materia orgánica (MO) y pueden ser utilizados para mejorar las propiedades químicas y físicas del suelo. El objetivo de este estudio fue evaluar el efecto de la aplicación de lodo de planta de tratamiento de aguas residuales de la industria de celulosa sobre las propiedades físicas y químicas de suelos volcánicos (Serie Gorbea y Collipulli). Se adicionó lodo (0, 10, 20, 30 y 50 Mg ha-1) a los suelos y se incubó por 75 días a 22 ± 2ºC. A los 15 y 75 días se determinó el contenido de materia orgánica (MO), nitrógeno disponible (N), pH, Al extractable, capacidad de campo, densidad aparente y estabilidad de los agregados. La aplicación de lodo incrementó significativamente (p &amp;#8804; 0,05) los...
Tipo: Journal article
Palavras-chave: Suelos degradados celulosa; Lodo química de suelos física de suelos.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000100001

Aplicación de Técnica de Hidróxido de Potasio y Glicerina para Diafanización Dentaria
Provedor de dados: 77
Autores: Bravo,Rodrigo; Valenzuela,Marcos; Cáceres,Felipe; Soto,Reinaldo.
La diafanización dentaria consiste en lograr transparentar la estructura mineralizada, permitiendo observar la arquitectura interna del diente. Se realiza principalmente a partir de métodos por deshidratación de la muestra. Por otro lado existen técnicas utilizadas para el estudio de centros de osificación basadas en métodos por maceración utilizando hidróxido de potasio y glicerina, de las cuales no se tiene antecedentes de haber sido utilizada en diafanización dentaria. El objetivo de este trabajo fue describir una técnica de diafanizado por maceración de tejidos dentarios mediante hidróxido de potasio y mostrar el resultado obtenido con un seguimiento de 5 años. Se seleccionó una muestra de 40 dientes (10 incisivos, 6 caninos, 10 premolares y 14...
Tipo: Journal article
Palavras-chave: Diafanización dentaria; Deshidratación; Maceración.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200041

Aplicación de un Algoritmo de Split-Window para la Estimación de la Temeratura de la Superficie Terrestre desde Datos AVHRR-NOAA
Provedor de dados: 113
Autores: Parra,Juan; Sobrino,José; Morales,Luis; Castellaro,Giorgio; Uribe,Juan; Gaete,Nelba.
Estimaciones de temperatura de la superficie terrestre, en días parciales a completamente despejados, fueron realizadas a partir de los datos proporcionados por el sensor Advanced Very High Resolution Radiometer (AVHRR), a bordo de la serie de satélites de la National Oceanic and Atmospheric Administration (NOAA) por aplicación de un algoritmo basado en el método de Split-Window. El algoritmo utilizado supone correcciones por emisividad y contenido de vapor de agua atmosférico, y fue validado con mediciones de temperatura de la superficie terrestre realizadas en terreno. Para esto, un data logger LI-1000 se instaló en la Estación Agrometeorológica dependiente del Instituto de Investigaciones Agropecuarias, Centro Regional de Investigación Carillanca,...
Tipo: Journal article
Palavras-chave: Emisividad temperatura de la superficie terrestre vapor de agua; Radiómetro satelite.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000400007

APLICACIÓN DE UN MODELO MÚLTIPLE DE CURVA DE LACTANCIA PARA VACAS LECHERAS
Provedor de dados: 113
Autores: Pedraza G.,Carlos; Mansilla M.,Alberto; Jahn B.,Ernesto; Vidal V.,Agustín; Fajardo R.,Paola; Agüero E.,Hernán.
El objetivo del presente trabajo fue probar una nueva expresión matemática destinada a mejorar la interpretación de los recuentos de células somáticas y niveles de producción de leche. Un modelo múltiple de curva de lactancia se comparó con el modelo clásico de Wood, separadamente para cada uno de los rangos celulares (RC). Se trabajó con una base de datos depurada proveniente del control sistemático de cinco rebaños lecheros que representan una masa de 1200 vacas Holstein Friesian. Se ajustó una curva de producción de leche, separadamente para vaquillas y vacas, mediante la expresión y(t) = a t b e- c t. El modelo múltiple propuesto estuvo basado en la ecuación anterior, incorporando la variable RC en la forma y (t, RC = a t b e- c t e d RC + f RC2. El...
Tipo: Journal article
Palavras-chave: Modelo matemático; Células somáticas; Producción láctea; Mastitis.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000400003

APLICATIONS OF ENVISAT DATA IN THE SOUTH OF CHILE: MONITORING ALGAL BLOOMS AND OTHER COASTAL OCEAN FEATURES USING MERIS AND AATSR IMAGERY
Provedor de dados: 72
Autores: Rodríguez.-Benito,C.; Haag,C.
Phytoplankton blooms have been monitored from April 2003 to August 2004, between latitudes 41&amp;deg;S and 45&amp;deg;S, in the region of Los Lagos in Chile, using MERIS and AATSR data from ENVISAT and from in situ oceanographic measurements. Apparently no other applications of remote sensing to monitor ocean features in this area was found. High frequency of cloud coverage, except in summer when plankton blooms prevail, may be one of the reasons to underestimate this technique. The study has included sampling in the coastal areas of this region using a Fluoroprobe, instrument specifically designed to simultaneously measure total concentration of chlorophyll and quantify the abundance of the following 5 algae divisions: Chlorophyceae, Cyanophyceae,...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300035

¿Apófisis o Proceso?: Un Aporte Lógico a la Construcción de la Terminología Anatomía
Provedor de dados: 77
Autores: Duque Parra,Jorge Eduardo; Barco Ríos,John.
En el presente trabajo se pretende cuestionar la inclusión en la Terminología Anatómica Internacional de dos términos con orígenes distintos para designar a una misma estructura. Bajo los preceptos de la Federación Internacional de Anatomistas (IFA), se estableció un listado de términos anatómicos en latín con el fin de facilitar la comunicación científica; sin embargo, en dicho listado aparecen algunos términos de origen griego que contradicen el precepto inicial. El término apófisis es de origen griego y su significado es ambiguo e impreciso, pues se presta a distintas interpretaciones, algunas veces erróneas, cuando se aplica para designar algunas salientes óseas. En contraposición, el término proceso, que se origina del latín processus, ofrece un...
Tipo: Journal article
Palavras-chave: Apófisis; Anatomía; Osteología; Proceso; Terminología.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400011

Apoptosis Durante el Desarrollo Embrionario de la Retina de Tortuga (Trachemys scripta elegans)
Provedor de dados: 77
Autores: Segovia,Y.
La apoptosis o muerte celular programada es un proceso que ocurre durante el desarrollo del sistema nervioso. El objetivo de este estudio fue observar los patrones de apoptosis que se producen durante el desarrollo embrionario de la retina, desde el estadio S16 al momento del nacimiento, mediante miscoscopía óptica y electrónica. Se utilizaron retinas de embriones de tortuga. Nuestros datos muestran que los primeros signos de apoptosis comienzan en el estadio S16, en la capa nuclear interna y alcanzan su máxima densidad tanto en la capa nuclear interna como en la capa de células ganglionares en S20, para extinguirse, prácticamente, en el momento del nacimiento. Por otra parte, la apoptosis sigue un gradiente centro-periferia.
Tipo: Journal article
Palavras-chave: Trachemys scripta elegans; Apoptosis; Retina; Tortuga.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100020

Apoptosis in Bone Defect of Diabetic Rats Treated with Low Intensity Laser: Radiological and Immunohistochemical Approach
Provedor de dados: 77
Autores: da Silva,Jairo Pinheiro; de Carvalho,Camila Albuquerque Mello; Romualdo,Andressa Rodrigues; Schiavoni,Vagner Sarraipo; Barbosa,Marcello Henrique Nogueira; de Moraes,Marcella Suélen Torrecilla; Tirapelli,Daniela Petri Cunha; Fazan,Valéria de Paula Sassoli; Thomazini,José Antônio; Tirapelli,Luis Fernando.
The aim of this study is evaluate the efficacy of 904 nm laser diode in bone regeneration in the bone defect in diabetic rats. Six groups of 10 male Wistar rats and 2 mm bone defects drilled on the left and right tibia were used. The diabetic animals were treated with streptozotocin (40 mg/kg, i.v.). We compared the diode laser doses of treatment of bone defects 50 w ­ 4 J/cm and 100 w ­ 4J/. The right tibia was used for immunohistochemical analysis with the apoptosis markers XIAP and Caspase-3 and the left tibia was submitted to computer tomography (CT). Caspase-3 marker showed greater amount of apoptosis in all the untreated groups compared to both laser treatments. There was no statistical significance for XIAP marker. CT scan showed improvement of bone...
Tipo: Journal article
Palavras-chave: Bone defect; Diabetes mellitus; Laser therapy; Regeneration; Apoptosis.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100029

Apoptosis in Denervated Skeletal Muscle
Provedor de dados: 77
Autores: Davatz,Giovanna Castilho; Andreo,Jesus Carlos; Rodrigues,Antonio de Castro; Rosa Júnior,Geraldo Marco; Moraes,Luiz Henrique Rapucci.
The apoptosis phenomenon happens in normal tissues and in many pathological conditions as described by several researchers. Most studied in the 70s, this phenomenon remained almost forgotten in the 90s, when, with the advent of more advanced techniques, returned to laboratories. Thus, electronic microscopy, Comet Assays and histochemistry techniques, among others, were utilized in an effort to elucidate in a thorough way, the mechanisms that lead the cell to "suicide". No one can deny the importance of the knowledge of such phenomenon, so as to control its induction or blocking in the treatment of pathologies such as cancer. In this work, the apoptosis study was aimed at denervated muscles in different periods. Furthermore, two types of skeletal striated...
Tipo: Journal article
Palavras-chave: Skeletal muscle; Denervation; Apoptosis; Rat.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300009

Apoptosis in HEp-2 cells infected with Ureaplasma diversum
Provedor de dados: 48
Autores: Amorim,Aline Teixeira; Marques,Lucas Miranda; Santos,Angelita Maria Oliveira Gusmão; Martins,Hellen Braga; Barbosa,Maysa Santos; Rezende,Izadora Souza; Andrade,Ewerton Ferraz; Campos,Guilherme Barreto; Lobão,Tássia Neves; Cortez,Beatriz Araujo; Monezi,Telma Alvez; Machado-Santelli,Glaucia Maria; Timenetsky,Jorge.
BACKGROUND: Bacterial pathogens have many strategies for infecting and persisting in host cells. Adhesion, invasion and intracellular life are important features in the biology of mollicutes. The intracellular location ofUreaplasma diversum may trigger disturbances in the host cell. This includes activation or inhibition of pro and anti-apoptotic factors, which facilitate the development of host damage. The aim of the present study was to associate U. diversum infection in HEp-2 cells and apoptosis induction. Cells were infected for 72hs with four U. diversum clinical isolates and an ATCC strain. The U. diversuminvasion was analyzed by Confocal Laser Scanning Microscopy and gentamicin invasion assay. The apoptosis was evaluated using pro-apoptotic and...
Tipo: Journal article
Palavras-chave: Ureaplasma diversum; Invasion; Apoptosis; HEp-2 cells.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100038

Apoptosis related genes expressed in cultured Fallopian tube epithelial cells infected in vitro with Neisseria gonorrhoeae
Provedor de dados: 48
Autores: REYES,PAZ A; VARGAS,MACARENA F; GARCÍA,KATHERINE P; RUBILAR,PAULINA S; NAVARRETE,PATRICIA A; FUENTES,PAMELA M; RÍOS,MIGUEL A; ORIHUELA,PEDRO A; VARGAS,RENATO H; RUBIO,VÍCTOR H; HECKELS,JOHN; CHRISTODOULIDES,MYRON; CÁRDENAS,HUGO; VELASQUEZ,LUIS A.
Background: Infection of the Fallopian tubes (FT) by Neisseria gonorrhoeae (Ngo) can lead to acute salpingitis, an inflammatory condition resulting in damage primarily to the ciliated cells, with loss of ciliary activity and sloughing of the cells from the epithelium. Recently, we have shown that Ngo infection induced apoptosis in FT epithelium cells by a TNF-alpha dependent mechanism that could contribute to the cell and tissue damage observed in gonococcal salpingitis. Aim: To investigate the apoptosis-related genes expressed during apoptosis induction in cultured FT epithelial cells infected in vitro by Ngo. Materials and Methods: In the current study, we used cDNA macroarrays and real time PCR to identify and determine the expression levels of...
Tipo: Journal article
Palavras-chave: Apoptosis; Fallopian tube; Neisseria gonorrhoeae; Salpingitis; TNF-alpha.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000400006

Aportes a la flora polínica de turberas altoandinas, Provincia de Jujuy, noroeste argentino
Provedor de dados: 73
Autores: Torres,Gonzalo R; Lupo,Liliana C; Sánchez,Ana C; Schittek,Karsten.
Se presenta la caracterización polínica de 15 especies, nuevas para la palinoflora andina, distribuidas en 12 familias, con una clave para su identificación. Las mismas pertenecen a la flora actual de comunidades vegetales de turberas altoandinas. Estos estudios tienen como objetivo aportar al conocimiento polínico de los ambientes de turberas altoandinas, con el fin de optimizar la identificación de tipos polínicos presentes en los registros fósiles del cuaternario de la región del noroeste argentino (NOA). Las descripciones pertenecen a las siguientes especies: Apiaceae: Lilaeopsis macloviana, Asteraceae: Cuatrecasasiella argentina, Perezia pygmaea, Brassicaceae: Eudema friesii, Cyperaceae: Carex gayana, Zameioscirpus muticus, Fabaceae: Astragalus...
Tipo: Journal article
Palavras-chave: Palinología; Turberas; Andes centrales; Noroeste argentino.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100004

Application of a More Advanced Procedure in Defining Morphological Types
Provedor de dados: 77
Autores: Jaksic,Damjan; Lilic,Ljubisa; Popovic,Stevo; Matic,Radenko; Molnar,Slavko.
It is well known that the most evident differences in humans are those related to anthropometric characteristics, and that during continuous monitoring the relation between human behavior and human abilities concerning their anthropometric characteristics was observed. The aim of this study was to detect and define the morphological types with the use of slightly different and more advanced methodologies. The sample included 149 male subjects, first-year students of the Faculty of Sport and Physical Education in Novi Sad, using an anthropometric measurement technique. A total of 12 anthropometric measures, defined according to the four-dimensional morphological model was used. For all variables, basic descriptive statistics were calculated while student...
Tipo: Journal article
Palavras-chave: Neural network; Intruder; Students; Anthropometry; Somatotypology.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100019

Application of bacterial and yeast biosurfactants for enhanced removal and biodegradation of motor oil from contaminated sand
Provedor de dados: 69
Autores: Chaprão,Marcos J; Ferreira,Isabela N.S; Correa,Priscilla F; Rufino,Raquel D; Luna,Juliana M; Silva,Elias J; Sarubbo,Leonie A.
Background This study investigated the potential application of two biosurfactants for enhanced removal capability and biodegradation of motor oil contaminated sand under laboratory conditions. The biosurfactants were produced by the yeast Candida sphaerica and by the bacterium Bacillus sp. cultivated in low-cost substrates. The ability of removing motor oil from soil by the two biosurfactants was identified and compared with that of the synthetic surfactants Tween 80 and Triton X-100. Results Both crude and isolated biosurfactants showed excellent effectiveness on motor oil removal from contaminated sand under kinetic conditions (70-90%), while the synthetic surfactants removed between 55 and 80% of the oil. A contact time of 5-10 min under agitation...
Tipo: Journal article
Palavras-chave: Bacillus sp; Bioremediation; Candida sphaerica; Petroleum; Sand-packed column.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600014

Application of bioleaching to copper mining in Chile
Provedor de dados: 69
Autores: Gentina,Juan Carlos; Acevedo,Fernando.
Background: Bioleaching of minerals is a process that allows the treatment of insoluble sulphides and insoluble oxides via hydrometallurgy, as opposed to the more traditional technology of pyrometallurgy. Bioleaching presents several technological, environmental and economic advantages as compared with pyrometallurgy, as well as some limitations. Results: In this work a general panorama of copper mining and biomining, the influence of the most relevant operating variables and their present and future situation in Chile are presented and discussed. Conclusions: Today, Chile plays an important role in the development and commercial application of bioleaching to copper ores. This background information allows predicting a brilliant future for this technology...
Tipo: Journal article
Palavras-chave: Dumps; Heap leaching; Hydrometallurgy; Leaching microorganisms; Pyrometallurgy.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300016

Application of microsatellite markers for breeding and genetic conservation of herds of Pantaneiro sheep
Provedor de dados: 69
Autores: Crispim,Bruno do Amaral; Seno,Leonardo de Oliveira; Egito,Andréa Alves do; Vargas Junior,Fernando Miranda de; Grisolia,Alexéia Barufatti.
Background The aim of the present study was to assess the genetic diversity of Pantaneiro sheep, using microsatellite markers, in order to assist maintenance and management plans, enhance mating systems and reduce the inbreeding rate. A total of 127 animals were genotyped at eight microsatellite loci. They belonged to populations from the Experimental Farm of the Universidade Federal da Grande Dourados (UFGD) (Dourados/MS/Brazil) and Embrapa Pantanal (Corumbá/MS/Brazil). Results The population of Pantaneiro sheep from the UFGD exhibited a high mean number of alleles (11.13) and allelic richness (10.66). The polymorphic information content was highly informative in the locus studied, resulting in a mean value of 0.71. Observed heterozygosity was lower than...
Tipo: Journal article
Palavras-chave: Animal genetic resources; Genetic diversity; Kinship; Locally adapted breed; STR.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600010

Application of Morphological Indices in the Assessment of Type and Function in Sheep
Provedor de dados: 77
Autores: Salako,A. E.
Live weight and eight body measurements records taken on 284 sheep comprising 226 West African Dwarf and 58 Yankasa sheep were analysed. The sheep were extensively managed within the south west Nigeria. The aim was to achieve a preliminary assessment of type and function from zoometrical indices produced from combinations of different morphometric scores. The indices used were weight, height slope, length index, width slope, depth index, foreleg length balance and cumulative index. The body measurements used were wither height, body length, hip length, hip width, rump height, foreleg length, chest width and heart girth. The body measurements showed that the Yankasa is bigger than the WAD sheep. The measured parts are highly correlated. Tested indices...
Tipo: Journal article
Palavras-chave: Indices; Indigenous sheep; Body measurements; Function.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000100003

Application of Oligonucleotide Microarray for the Detection and Genotyping of cry Genes in Bacillu thuringiensis
Provedor de dados: 117
Autores: Xu-Guang,Liu; Fu-Ping,Song; Si-Yuan,Wen; Sheng-Qi,Wang; Da-Fang,Huang; Jie,Zhang.
We have developed a parallel, rapid, high-throughput oligonucleotide microarray-based assay for the reliable detection and genotyping of three cry genes (cry1, cry2 and cry9) in Bacillus thuringiensis (Bt). After the non-polymerase chain reaction (PCR), amplified Bt genomic DNA were fluorescent-labeled using a random primer.   The corresponding oligonucleotide probes were designed for the different cry genes that can hybridize Bt genomic DNA after cluster analysis and were printed on glass slides. This microarray has unambiguously detected and identified the cry genes in 10 isolates and reference Bt. Our data demonstrates that the microarray assay is simple and rapid for the detection and genotyping of genes. This type of assay is also a potentially...
Tipo: Journal article
Palavras-chave: Oligonucleotide microarray; Cry genes; Genotyping; Random primer labeling; Bioinformatics.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200004

Application of Palatal Rugae Morphology in Forensic Identification
Provedor de dados: 77
Autores: Wu,Xiu-Ping; Han,Jian-Ning; Fen,Pan; Wang,Yu-Jin; Bing,Li.
To investigate the feasibility of application of digital images of the palatal rugae in forensic identification. One hundred patients, consisting of 50 males and 50 females, who received treatment between January 2015 and June 2015 at Shanxi Medical University Stomatological Hospital, China, were included in this study. High-resolution digital image of the palatal rugae was taken from each patient using a digital SLR camera and then processed using a digital image recognition system, including noise reduction, contrast enhancement, image segmentation, feature extraction, edge detection and information matching. Using an MATLAB software system, match results and the time taken by each operator for information matching were recorded. The digital image...
Tipo: Journal article
Palavras-chave: Forensic anthropology; Forensic stomatologia; Palatal rugae; Identification.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200017

Application of palm pressed fiber as a carrier for ethanol production by Candida shehatae TISTR5843
Provedor de dados: 69
Autores: Riansa-ngawong,Wiboon; Suwansaard,Maneewan; Prasertsan,Poonsuk.
Palm pressed fiber (PPF) is a clean and renewable lignocellulosic material. The PPF and delignified PPF (DPPF) were used as a carrier for immobilization of Candida shehatae TISTR5843 in bioethanol production. PPF was pre-treated by milling to obtain small particles, whereas DPPF was the delignification of PPF using NaClO2. C. shehatae TISTR5843 was grown in modified yeast extract- malt (YM) medium at 30 ± 2ºC on an orbital shaker at 150 rpm for batch and repeated batch fermentation. In the batch system, immobilized cells on a small size, less than 0.5 mm, of DPPF (sDPPF) gave the maximum ethanol production of 11.5 g L-1 at 24 hrs cultivation period. The ethanol concentration and ethanol yield of sDPPF were 6.2% and 6.8% higher (ethanol production 11.5 g...
Tipo: Journal article
Palavras-chave: Candida shehatae; Ethanol production; Immobilization; Palm pressed fiber.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600001

Application of Principal Component Factor Analysis in Quantifying Size and Morphological Indices of Domestic Rabbits
Provedor de dados: 77
Autores: Yakubu,A; Ayoade,J. A.
Body weight and four morphostructural traits namely body length, heart girth, thigh circumference and ear length of 103 New Zealand White x Chinchilla crossbred rabbits were measured. The investigation aimed at describing objectively the interdependence among conformation traits and to predict body weight from their independent factor scores using principal component analysis. Phenotypic correlations between body weight and body dimensions were highly significant (r=0.61 ­ 0.91; P&lt;0.01). Pairwise correlations of the body shape characters ranged from moderate to high values. From the factor analysis with varimax rotation of the intercorrelated traits, two principal components which accounted for 90.27% of the total variance were extracted. The first...
Tipo: Journal article
Palavras-chave: Body size; Growth; Rabbits.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400009

Application of response surface methodology for glucosyltransferase production and conversion of sucrose into isomaltulose using free Erwinia sp. cells
Provedor de dados: 69
Autores: Yukio Kawaguti,Haroldo; Manrich,Eiric; Harumi Sato,Hélia.
Isomaltulose is a structural isomer of sucrose commercially used in food industries. Glucosyltransferase produced by Erwinia sp. D12 catalyses an intramolecular transglucosylation of sucrose giving isomaltulose. The Experimental design and response surface methodology were applied for the optimization of the nutrient concentration in the culture medium for the enzyme production in shaken flasks at 200 rpm and 30ºC. The three variables involved in this study were sugar cane molasses, bacteriological peptone and yeast extract Prodex Lac SD®. The statistical analysis of the results showed that, in the range studied, all the factors had a significant effect (p &lt; 0.05) on glucosyltransferase production and the highest enzyme activity was observed in culture...
Tipo: Journal article
Palavras-chave: Batch process; Erwinia sp.; Free cells; Glucosyltransferase; Isomaltulose; Response surface methodology.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500003

Application of rice (Oryza sativa L.) suspension culture in studying senescence in vitro (I).: Single strand preferring nuclease activity
Provedor de dados: 69
Autores: Hosseini,Ramin; Mulligan,Bernard J.
Single Strand-Preferring Nucleases (SSPNs) have been implicated in the triggering and progress of cell death pathways, including senescence in higher plants, though the biological roles of such enzymes are still obscure. In the present study, heterotrophic cell suspension cultures of Oryza sativa L. (rice) cv Taipei 309 were used to investigate changes in Single Strand-Preferring Nuclease activity associated with cell death in vitro. An acid nuclease activity (pH 5.5) was found which was strongly stimulated in the presence of 10 mM Zn2+ and inhibited by 10 mM EDTA and EGTA. An increase in SSPN activity was concomitant with a loss of cell viability, total protein and the onset of stationary phase of growth in the cell cultures. Using DNA-SDS-PAGE two major...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100011

Application of rice (Oryza sativa L.) suspension culture in studying senescence in vitro (II).: Changes in DNA integrity
Provedor de dados: 69
Autores: Ramin,Hosseini; Mulligan,Bernard J.
Changes in the DNA content and organisation of senescing rice cell cultures (Taipei 309) were studied, using PCR and Southern blot analyses. A mitochondrial gene (coxII), a plastid gene (psaA) and a nuclear DNA maker (RG64) were analysed. The amplification of mitochondrial (mt), plastid and nuclear DNA produced the expected fragments, indicating that there were still some intact organelles and nuclei in the senescing rice cells. However, in plastid and nuclear DNA, changes in the number and size of the PCR products were observed. Southern blot analysis revealed that mt and nuclear DNA contents declined, but plastid DNA content remained relatively the same throughout the senescence.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100012

Application of statistical experimental methods to optimize medium for exopolymer production by newly isolated Halobacterium sp. SM5
Provedor de dados: 69
Autores: Lungmann,Patcharee; Choorit,Wanna; Prasertsan,Poonsuk.
The study investigated on medium optimization for production of exopolymer by a newly isolated bacterium, Halobacterium sp. SM5, using the mixture design and response surface method. The mixture experiment was designed by setting five parameters at the lowest and highest of concentrations: pseudo components design containing 0.15-0.25 glucose, 0.15-0.25 yeast extract, 0.35-0.45 MgSO4·7H2O, 0.1-0.2 vitamin casamino acid and 0.02-0.06 KCl. The results of the mixture design revealed that the effect of nutrients or elements on the exopolymer produced by the strain SM5 were in the order of MgSO4·7H2O &gt; yeast extract &gt; vitamin casamino acid &gt; KCl &gt; glucose, respectively. The suitable medium recipe for enhancement the exopolymer production was 7.43...
Tipo: Journal article
Palavras-chave: Exopolymer; Halophilic bacteria; Medium optimization; Mixture design; Response surface method.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100001

Applied Anatomy of the Femoral Veins in Macaca fascicularis
Provedor de dados: 77
Autores: Zhang,Yong-Zhen; Zhang,Xi; Xiong,Shao-Hu; Nie,Bing; Shen,Man-Ru; Liu,Zhen; Yuan,Jian-Ming; Dang,Rui-Shan; Zhang,Chuan-Sen.
The aim was to understand the anatomical features of the venous valve in Macaca fascicularis and to compare it with that of humans. The bilateral lower limbs (24 limbs from 12 animals) of Macaca fascicularis cadavers were dissected, and the femoral veins (FVs) were equally divided into distal, intermediate, and proximal sections. The external diameter of the FV in each section was measured. The venous valves were observed microscopically and stained with hematoxylin and eosin as well as trichrome. Data describing the human venous valve were collected from the current literature. No great saphenous veins were found among the 24 lower limbs from the Macaca fascicularis cadavers. The external diameters of the FVs in the distal, intermediate, and proximal...
Tipo: Journal article
Palavras-chave: Femoral vein; Venous valve; Primate; Applied anatomy; Macaca fascicularis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400012

Applied Anatomy of the Maxillofacial and Mandibular Regions of the Indian One-Humped Camel (Camelus dromedarius) and Its Clinical Implications during Regional Anesthesia
Provedor de dados: 77
Autores: Choudhary,O. P; Kalita,P. C; Kalita,A; Doley,P. J.
Since there is a lack of comprehensive data on the applied anatomy of the head region of Indian one-humped camel and its clinical value during regional anesthesia; therefore, this study was designed to provide information on clinically important parameters and landmarks of the head region. This study involved some osteometric parameters of the maxillas and mandibles of six adult Indian one-humped camels without any apparent skeletal disorders. Then, a total of twenty one head measurements and indices were recorded in the present study. The supraorbital foramen distance, infraorbital foramen distance, skull length, skull width, cranial length, nasal length and skull width of the Indian one-humped camels were 6.35±0.047 cm, 8.41±0.076 cm, 48.75±0.244 cm,...
Tipo: Journal article
Palavras-chave: Applied anatomy; Maxillofacial; Mandibular; Camel; Regional anesthesia.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300026

Applying a bioeconomic optimal control model to charcoal production: the case of slash-and-burn agriculture in Mexico
Provedor de dados: 118
Autores: Arrocha,Fernando; Villena,Mauricio G.
This paper analyzes the relationship between rural poverty and forest land management for the case of charcoal production under slash-and-burn agriculture. An optimal control model is used to determine how a representative household makes decisions about the allocation of labor and about the forest areas to exploit. In turn, these decisions affect the renewable resource base available to the community. The proposed optimal control model for charcoal production is based on the Pascual and Barbier (2007) model of slash-and-burn agriculture. This theoretical model is calibrated with data from the community of Chunkanán, Campeche, Mexico. The simulation and comparison of the traditional slash-and-burn approach to forest management with the Forest Management...
Tipo: Journal article
Palavras-chave: Charcoal production; Forest management; Rural poverty; Rural households.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300009

Approximation of the surface of gypseous soils in San Luis Potosí, Mexico
Provedor de dados: 118
Autores: Martínez-Montoya,Juan F; Herrero-Isern,Juan; Aceves-de Alba,Jorge; Palacio-Núñez,Jorge; Ruiz-Vera,Víctor M; Olmos-Oropeza,Genaro.
The gypseous soils of San Luis Potosí State, México, are not well map-delimited, despite their broad extent and the specific agricultural and environmental management they require. The present article highlights the location and extent of the gypseous lands in the Altiplano and Zona Media of San Luis Potosí State. For this purpose, soil, geology and vegetation maps as well as studies related to gypsum-rich soils, aerial photographs, and satellite maps (termed 'espaciomapas' in Spanish, these refer to Landsat-5 Thematic Mapper images of Red-Green-Blue:432 composition printed at 1:250,000 scale) were reviewed. Additionally, field and laboratory work were carried out. The maps provided by the Commission for Studies of the National Territory (CETENAL) proved...
Tipo: Journal article
Palavras-chave: Cartography; Landsat images; Sustainable land use; Photo interpretation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300013

Aprovechamiento humano de aves marinas durante el Holoceno medio en el litoral árido del norte de Chile
Provedor de dados: 97
Autores: PEÑA-VILLALOBOS,ISAAC; OLGUÍN,LAURA; LÓPEZ,PABLO FIBLA; CASTRO,VICTORIA; SALLABERRY,MICHEL.
Se identificó y analizó la osteofauna aviar del sitio arqueológico Copaca 1, ubicado en el litoral árido de la segunda Región de Chile. La muestra estuvo compuesta por 685 fragmentos extraídos desde nueve capas con dataciones que cubren un rango entre 8000 - 5000 años cal. a.p. Los resultados indican que el ensamble de aves marinas encontrado en este sitio conserva actualmente su rango de distribución en la zona de estudio, siendo dominantes los órdenes Suliformes, Procellariiformes y Pelecaniformes. Los análisis sugieren un aprovechamiento principalmente sobre Puffinus sp., Pelecanus thagus y Phalacrocorax sp., identificándose un mínimo número de individuos de 74 aves. Además, se estimó la masa corporal utilizable aportada por cada taxón y se determinó...
Tipo: Journal article
Palavras-chave: Aves guaneras; Copaca; Costa árida; Cazadores-recolectores-pescadores.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300007

Aproximación a la Tendencia Secular del Estado Nutricional y Composición Corporal en Escolares de Enseñanza Secundaria, V Región, Chile: 1985-2010
Provedor de dados: 77
Autores: Lizana Arce,Pablo José; Almagià Flores,Atilio Aldo; Simpson Lelievre,María Cristina; Binvignat Gutiérrez,Octavio; Ivanovic Marincovich,Daniza; Berral de la Rosa,Francisco José.
Durante el último siglo se ha identificado una tendencia secular positiva en el crecimiento físico de la mayor parte de las poblaciones del mundo, sobre todo en niños y adolescentes. La situación en Chile no ha sido distinta reflejándose un aumento en todos los grupos etáreos constituyendo uno de los más serios problemas de salud pública en Chile. Frente a este problema, es que se observa la tendencia del estado nutricional y composición corporal de dos muestras de estudiantes de enseñanza media de las comunas de Valparaíso, Viña del Mar y Concón, V Región, Chile, en los períodos 1984-1985 y 2009-2010. Las cohortes presentan diferencias significativas con un aumento en las variables IMC (Índice de Masa Corporal) y porcentaje de grasa corporal (p&lt; 0,05)...
Tipo: Journal article
Palavras-chave: Tendencia secular; Composición corporal; Obesidad; Escolares.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200028

Arabian Oryx (Oryx leucoryx) Trachea: a Descriptive and Morphometric Analysis
Provedor de dados: 77
Autores: Al-Zhgoul,Mohammad Borhan; Dalab,Abdul Hafeed S; Abdulhakeem,ElJarah; Ismail,Zuhair Bani; Thanain,Al Thanain.
The objective of this study was to report the distinctive anatomical and histological features of the trachea of the Arabian Oryx (Oryx leucoryx). The number of tracheal rings and tracheal length were measured. The diameter, thickness and cross sectional area of tracheal ring were determined at four tracheal regions (cranial cervical (CCR), middle cervical, thoracic inlets and intra thoracic). Tracheal rings were also collected for histological analysis. The mean length of the trachea was 54.1cm ± 0.73, while the number of tracheal rings varied from 50-51. Tracheal ring measurements (diameter, thickness and cross sectional area) were smallest at the thoracic inlet region. The ratio of the outer transverse to outer vertical and inner transverse to inner...
Tipo: Journal article
Palavras-chave: Oryx leucoryx; Trachea; Descriptive analysis; Morphometric analysis.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300005

Arabidopsis thaliana: A model host plant to study plant-pathogen interaction using Chilean field isolates of Botrytis cinerea
Provedor de dados: 48
Autores: GONZÁLEZ,JUAN; REYES,FRANCISCA; SALAS,CARLOS; SANTIAG,MARGARITA; CODRIANSKY,YAEL; COLIHEUQUE,NELSON; SILVA,HERMAN.
One of the fungal pathogens that causes more agriculture damage is Botrytis cinerea. Botrytis is a constant threat to crops because the fungus infects a wide range of host species, both native and cultivated. Furthermore, Botrytis persists on plant debris in and on the soil. Some of the most serious diseases caused by Botrytis include gray mold on vegetables and fruits, such as grapes and strawberries. Botrytis also causes secondary soft rot of fruits and vegetables during storage, transit and at the market. In many plant-pathogen interactions, resistance often is associated with the deposition of callose, accumulation of autofluorescent compounds, the synthesis and accumulation of salicylic acid as well as pathogenesis-related proteins. Arabidopsis...
Tipo: Journal article
Palavras-chave: Arabidopsis thaliana; Botrytis cinerea; Plant-pathogen interaction; PR genes.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200004

ARAÑAS CHILENAS: ESTADO ACTUAL DEL CONOCIMIENTO Y CLAVE PARA LAS FAMILIAS DE ARANEOMORPHAE
Provedor de dados: 72
Autores: Aguilera,Milenko A; Casanueva,María E.
La aracnofauna chilena ha sido parcialmente estudiada a través de los años, pero no en forma continua, lo que ha determinado un escaso conocimiento de los taxones presentes en nuestro país. La ausencia de textos y manuales que faciliten la identificación, y determinación taxonómica de las arañas presentes en Chile, hace aún más difícil el estudio de este grupo. Para Chile se han descrito 55 familias, de las cuales 6 pertenecen a Mygalomorphae y 49 a Araneomorphae, lo que representa aproximadamente el 50% de las familias conocidas a nivel mundial. En este estudio se reconocen 51 familias. Es importante destacar la necesidad de continuar con estudios sistemáticos de las arañas presentes en Chile, y determinar su biología, distribución geográfica y...
Tipo: Journal article
Palavras-chave: Arañas; Sistemática; Clave; Antecedentes biológicos; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200001

Arañas sociales de la Amazonía ecuatoriana, con notas sobre seis especies sociales no descritas previamente
Provedor de dados: 97
Autores: AVILÉS,LETICIA; MADDISON,WAYNE P.; SALAZAR,PATRICIO A.; ESTÉVEZ,GERMANIA; TUFIÑO,PAÚL; CAÑAS,GUSTAVO.
La Amazonía ecuatoriana posee una excepcional diversidad y abundancia de arañas sociales. En esta zona están presentes tres de los cuatro tipos de sociabilidad descritos para arañas, incluyendo representantes de 10 géneros y siete familias diferentes. En este artículo revisamos brevemente la historia natural de las catorce especies con algún tipo de sociabilidad que hemos identificado en esta área, incluyendo seis especies ­Cyclosa sp., Plesiometa sp., Tapinillus sp. 2, Achaearanea cf. mundula, una especie de la familia Pholcidae y otra de la familia Sparassidae­ cuya sociabilidad no ha sido descrita previamente. En la introducción revisamos los distintos tipos de sociabilidad en arañas, anotando características únicas que les diferencian de los insectos...
Tipo: Journal article
Palavras-chave: Comportamiento social; Proporción de sexos; Niveles de selección; Metapoblaciones; Evolución.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300009

Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species
Provedor de dados: 97
Autores: SHEPHERD,JOHN D; DITGEN,REBECCA S; SANGUINETTI,JAVIER.
Pre-dispersal seed predation by Austral parakeets, Enicognathus ferrugineus, on pehuén, Araucaria araucana, was studied to assess the relationship between predation and seed production. We collected falling seeds in four araucaria forests of southwestern Neuquén Province, Argentina during four years that included both mast and intermast years. Predation rates were negatively correlated with seed production. When seed production was high, predation rates ranged from 0.6 to 3.3 %; when it was low, predation rates ranged from 13.0 to 20.6 %. Years differed in the pattern of monthly seed fall with peak seed fall in March 2002 and April 2003. Predation rates were lower and more uniform in the year of higher seed production, but did not differ between sites. In...
Tipo: Journal article
Palavras-chave: Pre-dispersal seed predation; Masting; Araucaria araucana; Enicognathus ferrugineus.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300008

ARBUSCULAR MYCORRHIZAE IN AGRICULTURAL AND FOREST ECOSYSTEMS IN CHILE
Provedor de dados: 126
Autores: Borie,Fernando; Rubio,Rosa; Morales,Alfredo; Curaqueo,Gustavo; Cornejo,Pablo.
Arbuscular mycorrhizal (AM) association plays a key role in the sustainability of terrestrial plant ecosystems, in particular those presenting limitations for the establishment and subsequent growth of plants. In Chile, more than 50% of arable soils are originated from volcanic ashes, showing in general several constraints to crop production, such as low pH, high exchangeable aluminum content and low levels of available P. Under these conditions, the management of AM fungal propagules using adequate cultural management practices emerges as a successful alternative in order to maximize the positive effects of AM symbiosis on plant growth in these types of soil. This review presents the results of several years of research about the effect of different...
Tipo: Journal article
Palavras-chave: Andisol; Management practices; Mycorrhizal propagules; N sources; P fractions; Ultisol.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100001

ARBUSCULAR MYCORRHIZAL FUNGI AND SOIL AGGREGATION
Provedor de dados: 127
Autores: Borie,Fernando; Rubio,Rosa; Morales,Alfredo.
Soil aggregation is governed by several biotic and abiotic components including land-use management. Aggregation is essential to maintain soil physical properties and facilitate biogeochemical cycling. Hyphae of arbuscular mycorrhizal fungi (AMF) are considered to be primary soil aggregators and there is a positively correlation between AMF hyphae and aggregate stability in natural systems. Recent evidence suggests that glomalin (GRSP), a glycoprotein produced by AMF hyphae which has a cementing capacity to maintain soil particles together, is mainly involved in such aggregation. However, recently controversial results together with reported shortcoming in glomalin determinat suggest to proceed with caution when studying glomalin in connection with soil...
Tipo: Journal article
Palavras-chave: Arbuscular mycorrhizal fungi; Soil aggregates; Glomalin.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000200003

Arbuscular mycorrhizal fungi associated with the rhizosphere of seedlings and mature trees of Swietenia macrophylla (Magnoliophyta: Meliaceae) in Los Tuxtlas, Veracruz, Mexico
Provedor de dados: 97
Autores: Rodríguez-Morelos,Víctor H; Soto-Estrada,Alejandra; Pérez-Moreno,Jesús; Franco-Ramírez,Alicia; Díaz-Rivera,Pablo.
BACKGROUND: Big-leaf mahogany (Swietenia macrophylla King) is the woody species with the highest economic value in Latin America. Currently, it is subject to intensive exploitation, diminishing its natural populations. Due to this decline, the species is a preferred species for reforestation and establishment of commercial tropical plantations. Mycorrhizal symbiosis is a biotic factor scarcely studied in the ecology of this species. Therefore, the objective of this research was to identify the diversity of arbuscular mycorrhizal fungi (AMF) species associated with the rhizosphere of seedlings and mature trees of big-leaf mahogany growing in its natural habitat, a tropical rain forest in Los Tuxtlas, Veracruz, Mexico. Soil samples from a 20-cm depth were...
Tipo: Journal article
Palavras-chave: Arbuscular mycorrhizae; Morphospecies; Seedlings; Spores; Tropical trees.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100009

Arbuscular mycorrhiza-like biotechnological potential of Piriformospora indica, which promotes the growth of Adhatoda vasica Nees
Provedor de dados: 69
Autores: Rai,Mahendra; Varma,Ajit.
We report the growth promoting potential of Piriformospora indica, which is a newly discovered arbuscular mycorrhiza-like fungus. It is a facultative symbiont and unlike arbuscular mycorrhizal fungi, it can be cultured in vitro. Adhatoda vasica is a medicinal plant. Rapid proliferation of roots was recorded in A. vasica withan important root colonization estimated to 95% after 6 months. P. indica improved growth of A. vasica. This association forms a new host-symbiont combination
Tipo: Journal article
Palavras-chave: Adhatoda vasica; Arbuscular mycorrhiza-like; Biotechnological potential; Growth promotion; Piriformospora indica.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100013

Archaeal and bacterial assemblages in the Oxygen Minimum Zone of the upwelling ecosystem off Central Chile as determined by organic biomarkers
Provedor de dados: 72
Autores: SRAIN,BENJAMÍN; SEPÚLVEDA,JULIO; PANTOJA,SILVIO; SUMMONS,ROGER E; QUIÑONES,RENATO A; LEVIPAN,HÉCTOR A.
Organic biomarkers were used to investigate the influence of seasonal changes in oxygenation and water chemistry on the distribution of archaea and bacteria in the water column and surface sediments of the continental shelf off central Chile (ca. 36°S), an area influenced by seasonal upwelling and the development of an oxygen minimum zone. We were interested in establishing if occurrence of archaea and bacteria responds to oxygenation and water chemistry for which we analyzed archaeal isoprenoid (i) and bacterial branched (br) glycerol dialkyl glycerol tetraethers (GDGTs). Our results combined with molecular data from a year round observational program at the same sampling site and depths indicatives the occurrence and dominance of the marine pelagic group...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100005

Archeological and mtDNA evidence for Tropical Lowland migrations during the Late Archaic / Formative in northern Chile
Provedor de dados: 97
Autores: ROTHHAMMER,FRANCISCO; SANTORO,CALOGERO M; POULIN,ELIE; ARRIAZA,BERNARDO T; MORAGA,MAURICIO; STANDEN,VIVIEN J.
The influence of tropical lowland migrations on the emergence of cultural change in the Central Andes has been postulated in general terms since the beginning of last century (Tello 1929). Archeological and molecular genetic evidence, particularly agriculture of tropical cultigens and ancient mtDNA haplogroup typing in northern Chile, suggest a chronologically more precise relationship between both regions. We test in this article the hypothesis that the process of cultural transformation of prehistoric populations living on the coast and the desert valleys of northern Chile can be partially linked to gene flow from the eastern slopes of the Andes and/or from the tropical lowlands during the Late Archaic / Formative periods (ca. 3,500-2,000 B.P.).
Tipo: Journal article
Palavras-chave: Ancient mtDNA; Central Andes; Cultural change; Tropical lowland migration.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400008

Arco Axilar de Langer (Músculo Axilopectoral): Variante Supernumeraria Inusual del Músculo Latísimo del Dorso. Reporte de Tres Casos
Provedor de dados: 77
Autores: Ortiz,Jesús Ignacio; Ramirez V,Fernando; Petrosino,Pierina; Milano,Melisse; Arenas,Asmiria; Castillo,Virgilio.
El arco axilar de Langer o músculo axilopectoral es una variación relativamente rara de la inserción del músculo latísimo del dorso. Se identifica en aproximadamente el 1.7 a 7% de las disecciones axilares y corresponde a un complejo músculofascial, la parte muscular junto con el tendón del músculo pectoral mayor se inserta dentro del labio lateral del surco intertubercular del húmero, mientras que, la parte fascial está formada por bandas fibrosas que se extienden en la parte profunda del músculo pectoral mayor para insertarse en el proceso coracoide entre la unión de los músculos coracobraquial y pectoral menor. El reconocimiento de esta anomalía es importante para los médicos clínicos, cirujanos y fisioterapeutas, ya que obliga a plantearse el...
Tipo: Journal article
Palavras-chave: Arco axilar de Langer; Músculo axilopectoral.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400039

Arctiin blocks hydrogen peroxide-induced senescence and cell death though microRNA expression changes in human dermal papilla cells
Provedor de dados: 48
Autores: Bae,Seunghee; Lim,Kyung Mi; Cha,Hwa Jun; An,In-Sook; Lee,Jeong Pyo; Lee,Kwang Sik; Lee,Ghang Tai; Lee,Kun Kook; Jung,Ho Jung; Ahn,Kyu Joong; An,Sungkwan.
BACKGROUND: Accumulating evidence indicates that reactive oxygen species (ROS) are an important etiological factor for the induction of dermal papilla cell senescence and hair loss, which is also known alopecia. Arctiin is an active lignin isolated from Arctium lappa and has anti-inflammation, anti-microbial, and anti-carcinogenic effects. In the present study, we found that arctiin exerts anti-oxidative effects on human hair dermal papilla cells (HHDPCs). RESULTS: To better understand the mechanism, we analyzed the level of hydrogen peroxide (H2O2)-induced cytotoxicity, cell death, ROS production and senescence after arctiin pretreatment of HHDPCs. The results showed that arctiin pretreatment significantly inhibited the H2O2-induced reduction in cell...
Tipo: Journal article
Palavras-chave: Dermal papilla cell; Senescence; Cell death; MicroRNA; Arctiin.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100073

Are good ideas enough?: The impact of socio-economic and regulatory factors on GMO commercialisation
Provedor de dados: 48
Autores: Vàzquez-Salat,Núria.
In recent years scientific literature has seen an increase in publications describing new transgenic applications. Although technically-sound, these promising developments might not necessarily translate into products available to the consumer. This article highlights the impact of external factors on the commercial viability of Genetically Modified (GM) animals in the pharmaceutical and food sectors. Through the division of the production chain into three Policy Domains -Science, Market and Public- I present an overview of the broad range of regulatory and socio-economic components that impacts on the path towards commercialisation of GM animals. To further illustrate the unique combination of forces that influence each application, I provide an in-depth...
Tipo: Journal article
Palavras-chave: Genetically modified organisms; GM animals; Policy domains; Governance; Socio-economic factors.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400002

Are levels of digestive enzyme activity related to the natural diet in passerine birds?
Provedor de dados: 48
Autores: Ramírez-Otárola,Natalia; Sabat,Pablo.
Digestive capabilities, such as the rates nutrient hydrolysis and absorption, may affect energy intake and ultimately feeding behavior. In birds, a high diversity in gut biochemical capabilities seems to support the existence of a correlation between the morphology and physiology of the intestinal tract and chemical features of the natural diet. However, studies correlating the activity of digestive enzymes and the feeding habits at an evolutionary scale are scarce. We investigated the effect of dietary habits on the digestive physiological characteristics of eight species of passerine birds from Central Chile. The Order Passeriformes is a speciose group with a broad dietary spectrum that includes omnivorous, granivorous and insectivorous species. We...
Tipo: Journal article
Palavras-chave: Birds; Diet; Intestinal enzymes; Passeriformes; Food habits; Adaptation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100011

ARECO INIA, CULTIVAR CHILENO DE AVENA PARA PRODUCCIÓN DE FORRAJE EN ARGENTINA
Provedor de dados: 113
Autores: Beratto M.,Edmundo; Rivas P.,Rudy.
Areco INIA es un nuevo cultivar de avena (Avena sativa L.) de hábito alternativo, que tiene buen comportamiento para la producción de forraje en Argentina. Se obtuvo a partir de un cruzamiento entre las líneas avanzadas AVE 85.103 y AVE 78.106 realizado en 1987 en el Centro Regional de Investigación Carillanca, del Instituto de Investigaciones Agropecuarias, ubicado cerca de Temuco, Chile. En este país fue incorporada a experimentos de rendimiento en 1995, y en Argentina fue evaluada en 1998 y 1999, para producción de forraje verde en Lujan, y para reacción a enfermedades en Lujan y Chacabuco (Provincia de Buenos Aires) y Maciel (Provincia de Santa Fé), por la empresa Trigen Seed Services LLC (TGSS). Areco INIA tiene buena resistencia a las enfermedades...
Tipo: Journal article
Palavras-chave: Avena sativa L; Avena alternativa; Forraje; Enfermedad.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000200011

Argentaffine Cells in the Digestive Tract of Hibernating and Non-hibernating in Chinese Fire-bellied Newt (Cynops orientalis)
Provedor de dados: 77
Autores: Xie,Zhaohui; Guo,Duanqiang; Lu,Chengkai; Li,Boying; Shan,Linna.
In order to further studying the relationship between the gastrointestinal endocrine cells and the hibernation of Chinese fire-bellied newt, histological techniques were used in this study to explore the distributed density and morphology of argentaffine cells in the digestive tract during hibernation and non-hibernation. The argentaffine cells could be observed throughout the digestive tract of Chinese fire-bellied newt during hibernation and non-hibernation and mainly distributed in the acinar epithelial cells, epithelial cells and intrinsic membrane. They had appeared in the shape of goblet, pyramid, ellipse, round, cone-shaped, spindle-shaped. The cytoplasm contains secretory granules at the basal regions with spherical nuclei in the basal regions....
Tipo: Journal article
Palavras-chave: Cynops orientalis; Digestive tract; Argentaffine cells; Hibernation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400021

Arion intermedius (Gastropoda: Stylommatophora): first record of this introduced slug in Chile, with notes on its anatomy and natural history
Provedor de dados: 97
Autores: CÁDIZ,FRANCISCO J; GALLARDO,CARLOS S.
Results and conclusions are presented on morphological and field observations made on a collection of land slugs from the Arboretum and Botanical Garden administered by the Universidad Austral de Chile at Valdivia, as well as various records from other collection sites in southern Chile. Based on some anatomical features, the individuals studied were identified as Arion intermedius Normand, 1852, endemic to eastern Europe, and known from various locations around the world for its invasive capacity, apparently facilitated by its feeding habits and particularly by its reproductive strategy of strict self fertilization which is unusual in pulmonates. This is the first report of this species, introduced to Chile by human activities, added to previous...
Tipo: Journal article
Palavras-chave: Arionidae; Arion intermedius; Species introduction; Invasive potential.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000100008

Aristóteles: Pionero en el Estudio de la Anatomía Comparada
Provedor de dados: 77
Autores: Romero Reverón,Rafael.
Aristóteles (384-322 a. n. e.); filosofo prodigioso, de amplios conocimientos, investigador incansable y enciclopédico, con sentido crítico y didáctico, resumió y abarco la sabiduría antigua, enriqueciéndola con sus valiosas observaciones, experiencias y descubrimientos, fundador de numerosos campos del saber universal entre ellos; el estudio de la Lógica, la Historia natural, la biología, la anatomía comparada, la zoología, la embriología, y la botánica.
Tipo: Journal article
Palavras-chave: Aristóteles; Anatomía comparada; Embriología; Zoología.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100052

Arquitectura de las Fibras Ventriculares en el Corazón de Avestruz (Struthio camelus)
Provedor de dados: 77
Autores: Carvallo,Pamela; Henríquez - Pino,Jorge.
La disposición de las fibras del miocardio ventricular del corazón del avestruz (Struthio camelus) fue estudiada macro y mesoscópicamente en 14 corazones de avestruz, disecados mediante una adaptación del método de Pettigrew. Se identificaron tres capas musculares: superficial, media y profunda, de acuerdo a la orientación de las fibras del miocardio ventricular. Las fibras de la capa superficial son comunes a ambos ventrículos, en cambio las fibras de las capas media y profunda son propias de cada ventrículo. El ventrículo izquierdo presenta una gruesa capa muscular media, que también constituye mayoritariamente el septo interventricular y el ápex del corazón.
Tipo: Journal article
Palavras-chave: Miocardio; Ventrículo; Avestruz.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200002

Arquitectura foliar de las Lauraceae del Distrito Federal, Brasil, y nuevos patrones de venación propuestos
Provedor de dados: 73
Autores: Gomes-Bezerra,Kadja Milena; Soares-Silva,Lucia Helena; Gomes,Sueli Maria.
Fueron estudiadas las hojas de 18 especies de Lauraceae que crecen en el Distrito Federal (Brasil), con el objetivo de caracterizar sus patrones de venación e identificar características útiles en su diferenciación taxonómica, para que junto a su morfología se puedan obtener criterios útiles que ayuden en su identificación vegetativa. Las hojas fueron diafanizadas, coloreadas y fotografiadas. Los patrones de venación del segundo, tercero, cuarto y quinto orden fueron descritos e ilustrados para las especies estudiadas, que presentaron una venación secundaria de tipo broquidódroma o eucamptódromo-broquidódroma, excepto en Crytocarya aschersoniana y Ocotea aciphylla con venación broquidódroma promínula reticulada. La densidad de areolas se mostró como un...
Tipo: Journal article
Palavras-chave: Arquitectura foliar; Morfología de las hojas; Venación foliar.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100001

ARRANGEMENT AND DISTRIBUTION OF THE ARTERIAL CIRCLE IN BRAIN OF WILD BOAR (Sus Scrofa Scrofa) LINNAEUS (1758): QUILITATIVE AND QUANTITATIVE ANALYSIS
Provedor de dados: 77
Autores: Câmara Filho,J. A.; Sherer,P. O.; Sherer,R. R.; Meneses,C. M. C.; Babinski,M. A.
SUMMARY: Thirteen brains of wild boar (Sus scrofa scrofa) were investigated with the purpose to discrebe the formation and the branchings of the brain arterial circle and basilar artery, from injetions of colored latex into the arteries of the base of the brain, and to establish the degree of correlativity between the rostro-caudal, latero-lateral lengths, weight, volume, carotid and basilar arteries diameter and the length of the basilar artery. To the anatomic study male and female heardswere used, from the slaughterhouse Pro Fauna licensed to abate and comercialize wild animal and under the Federal Inspection Service (SIF) control, situated in Iguape city, São Paulo. In all animal latex was injected after what the arteries of the base of the brain were...
Tipo: Journal article
Palavras-chave: Artery; Internal carotid artery Basilar artery Brain arterial circle.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000400002

Arrowleaf Clover (Trifolium vesiculosum Savi): A New Species of Annual Legumes for High Rainfall Areas of the Mediterranean Climate Zone of Chile
Provedor de dados: 117
Autores: Ovalle M,Carlos; del Pozo,Alejandro; Fernández,Fernando; Chavarría,Jorge; Arredondo,Susana.
The present review examines the main attributes and agronomic characteristics of arrowleaf clover (Trifolium vesiculosum Savi) and its incorporation into production systems in dryland areas of the Andean foothills of the humid Mediterranean climate zone of Chile. It is a new species of annual legume in Chile for light and medium textured soils. The root system can reach a depth of 1.5 m and its seeds have a high percentage of hardseedness (99.8%). It is an upright plant, with purplish-white flowers. The mature plant has large arrow-shaped leaves up to 50 mm long, often marked with a large white “V”. Dry matter and seed production in the Andean foothills is high (3.9-8.8 t DM ha-1 and 700-900 kg ha-1, respectively), surpassing the productivity of sub clover...
Tipo: Journal article
Palavras-chave: Arrowleaf clover; Annual legume pastures; Dryland Andean foothills; Mediterranean pastures.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100018

Art, biotechnology and the culture of peace
Provedor de dados: 69
Autores: DaSilva,Edgar.
Biotechnology, in its voyage from ancient times into the expanding frontier areas of today's world of scientific research, has revealed itself as the gene of diplomacy and international cooperation in the relationships between nations (&lt;a href="#16"&gt;DaSilva, 2002&lt;/a&gt;). Economic and biotechnological considerations, strong elements in themselves, drive policy implementation that draws upon the support and sustenance of the public's logic and understanding of science obtained through the avenues of art and culture. More and more scientists are teaming up with artists to harness the world of microbes and biotechnology in the pursuit of one's natural well-being, of the conservation of environmental heritage, and of human comradeship and welfare. Art...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200007

Arteria Braquial Superficial Bilateral: Una Variación Anatómica Infrecuente con Implicancias Clínicas y Quirúrgicas
Provedor de dados: 77
Autores: Salgado,Guillermo; Inzunza,Oscar; Rodríguez,Javier; Soza,Romina; Cantín,Mario.
Las variaciones del sistema arterial en el miembro superior son relevantes debido a la gran cantidad de procedimientos diagnósticos, invasivos y terapéuticos realizados en la actualidad. Reportamos una variante poco frecuente de la arteria braquial superficial (ABS) encontrada bilateralmente en los miembros superiores. En ambos miembros la ABS descendió superficial y lateral al nervio mediano y medial a la cabeza corta del músculo bíceps braquial. La ABS derecha terminó en la fosa cubital se unió a la arteria braquial en un tronco común, una variación anatómica rara de tipo isla, mientras que la ABS izquierda terminó en el antebrazo como arteria radial. La presencia unilateral de la ABS se ha informado con una frecuencia relativa, pero una variación...
Tipo: Journal article
Palavras-chave: Arteria braquial superficial; Arteria braquial; Miembro superior; Variación arterial.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100049

Arteria Circunfleja Iliaca Superficial: Importancia Anátomo Quirúrgica
Provedor de dados: 77
Autores: del Sol,Mariano; Vásquez,Bélgica.
La arteria circunfleja ilíaca superficial es un pequeño vaso que se origina, generalmente, en la arteria femoral a nivel del triángulo femoral, dirigiéndose paralela al ligamento inguinal hacia la espina ilíaca anterosuperior. Actualmente es utilizada frecuentemente en colgajos libres llevados a cabeza, cuello, miembros e incluso en reconstrucciones peneanas. Disecamos 68 regiones inguinales de cadáveres formolizados en la disciplinas de anatomía topográfica de las Universidades de La Frontera, Chile y Federal de Sao Paulo, Brasil. La arteria cincunfleja ilíaca superficial tuvo un diámetro externo de 1,42 mm en promedio y la distancia desde su origen al ligamento inguinal fue de 15,1 mm. La arteria se originó directamente de la arteria femoral en 47 casos...
Tipo: Journal article
Palavras-chave: Anatomía; Arteria femoral; Arteria circunfleja iliaca superficial; Colgajo libre.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200046

Arteria Subclavia Aberrante
Provedor de dados: 77
Autores: Inzunza,Oscar; Burdiles,Álvaro.
Se estudiaron las variaciones en el origen y trayecto de la arteria subclavia derecha aberrante, observada en un cadáver utilizado para docencia de anatomía humana. En este caso, el arco aórtico da origen a cuatro ramas separadas, que de derecha a izquierda son: arteria carótida común derecha, arteria carótida común izquierda, arteria subclavia izquierda y arteria subclavia derecha. Desde este origen, la arteria subclavia derecha transcurre por detrás de la tráquea y del esófago, a la altura del cuerpo vertebral de T III, para luego retomar su trayecto normal hacia la raíz del cuello. Se midieron los diámetros del arco aórtico y de sus ramas. Asimismo, se consignaron los díametros y la distancia de origen de ambas arterias vertebrales, desde las arterias...
Tipo: Journal article
Palavras-chave: Arteria subclavia derecha aberrante; Arteria lusoria; Variación anatómica.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400036

Arteria Vertebral Izquierda Aberrante
Provedor de dados: 77
Autores: Inzunza H,Oscar; Burdiles,Álvaro.
Se presenta una variación anatómica de la arteria vertebral izquierda, detectada en un cadáver utilizado para docencia en el Departamento de Anatomía de la Escuela de Medicina de la Pontificia Universidad Católica de Chile. En el mediastino superior del cadáver mencionado, se pudo apreciar que el arco aórtico da origen, de derecha a izquierda, a las siguientes ramas: arteria braquiocefálica, arteria carótida común izquierda, arteria vertebral izquierda aberrante y, finalmente, la arteria subclavia izquierda. La arteria vertebral izquierda aberrante se origina en la parte más alta del arco aórtico, presentando en este punto un diámetro de 4 mm; luego asciende a la izquierda de la carótida común ipsilateral y por sobre la cara anterolateral de la columna...
Tipo: Journal article
Palavras-chave: Variación anatómica; Arteria vertebral aberrante.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100030

Arterial Supply to the Rotator Cuff Muscles
Provedor de dados: 77
Autores: Naidoo,N; Lazarus,L; De Gama,B. Z; Ajayi,N. O; Satyapal,K. S.
The arterial supply to the rotator cuff muscles is generally provided by the subscapular, circumflex scapular, posterior circumflex humeral and suprascapular arteries. This study involved the bilateral dissection of the scapulohumeral region of 31 adult and 19 fetal cadaveric specimens. The subscapularis muscle was supplied by the subscapular, suprascapular and circumflex scapular arteries. The supraspinatus and infraspinatus muscles were supplied by the suprascapular artery. The infraspinatus and teres minor muscles were found to be supplied by the circumflex scapular artery. In addition to the branches of these parent arteries, the rotator cuff muscles were found to be supplied by the dorsal scapular, lateral thoracic, thoracodorsal and posterior...
Tipo: Journal article
Palavras-chave: Arterial supply; Variations; Rotator cuff muscles; Parent arteries.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100023

Arterial Variations of the Subclavian-Axillary Arterial Tree: Its Association with the Supply of the Rotator Cuff Muscles
Provedor de dados: 77
Autores: Naidoo,N; Lazarus,L; De Gama,B. Z; Ajayi,N. O; Satyapal,K. S.
The subclavian-axillary arterial tree is responsible for the arterial supply to the rotator cuff muscles as well as other shoulder muscles. This study comprised the bilateral dissection of the shoulder and upper arm region in thirty-one adult and nineteen fetal cadaveric specimens. The variable origins and branching patterns of the axillary, subscapular, circumflex scapular, thoracodorsal, posterior circumflex humeral and suprascapular arteries identified in this study corroborated the findings of previous studies. In addition, unique variations that are unreported in the literature were also observed. The precise anatomy of the arterial distribution to the rotator cuff muscles is important to the surgeon and radiologist. It will aid proper interpretation...
Tipo: Journal article
Palavras-chave: Subclavian-axillary arterial tree; Variations; Supply; Rotator cuff muscles.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400049

Arterias Comunicantes del Círculo Arterial del Cerebro: Características Biométricas y Relación con el Índice Cefálico
Provedor de dados: 77
Autores: Mandiola,E; Alarcón,E; Oñate,J. C; del Sol,M; Olave,E.
La clínica neuroquirúrgica tiene la necesidad de un acabado conocimiento anatómico de las arterias comunicantes como integrantes del círculo arterial del cerebro, por su variabilidad morfológica, su relación compleja con las estructuras adyacentes y por la alta frecuencia observada en la conformación de aneurismas. Debido a la importancia de estos vasos, efectuamos un estudio biométrico de los mismas, relacionando datos de calibre y longitud con índice cefálico. En el sexo masculino, el calibre promedio de la ACoP fue de 1,07 mm en el lado derecho y de 1,06 mm en el izquierdo; en el sexo femenino fue de 1,12 mm en el lado derecho y de 1,14 mm en el izquierdo. En el grupo de individuos con índice braquicéfalo, el calibre de la ACoP fue de 1,15 mm y en el...
Tipo: Journal article
Palavras-chave: Anatomía; Biometría; Círculo arterial cerebral; Arterias comunicantes; Indice cefálico.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300048

Arterias Hepáticas Aberrantes: Estudio en 64 Cadáveres Disecados
Provedor de dados: 77
Autores: Ottone,Nicolás Ernesto; Arrotea Molina,Agustín; Domínguez,Mario Luis; Lo Tartaro,Maximiliano; García de Quiros,Nicolás; Medan,Carlos; Blasi,Esteban; Bertone,Vicente Hugo.
La promoción del conocimiento de la distribución vascular hepática, tanto clásica como de sus variaciones, es fundamental para planear y realizar todos los procedimientos quirúrgicos y radiológicos en el abdomen superior. Se disecaron 64 cadáveres, formolizados al 10%, entre 1980 y 2005. Primero se abrió la cavidad abdominal con incisión en boca de horno, luego se investigaron fundamentalmente el omento menor y el pedículo hepático y se procedió a la disección del compartimiento supramesocólico. Los resultados de las disecciones fueron agrupados en 5 clases: Clase 1 (73,44%): Disposición arterial clásica. Clase 2A (9,37%): Arterias hepáticas izquierdas aberrantes accesorias con origen en la arteria gástrica izquierda. Clase 2B (4,69%): Arterias hepáticas...
Tipo: Journal article
Palavras-chave: Hígado; Arteria hepática; Arterias hepáticas aberrantes; Hilio hepático.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500011

Arterias Mentolabiales Bilaterales: Reporte de un Caso
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Cantín López,Mario; Zavando Matamala,Daniela Alejandra.
En un cadáver repletado con látex coloreado rojo, se reporta la presencia bilateral de arterias ramas de la arteria facial, que se dirigen a irrigar la región mentolabial. Se discute la importancia de la descripción de las variaciones anatómicas en la irrigación de la cara y labio inferior por las implicancias en la cirugía reconstructiva de labio.
Tipo: Journal article
Palavras-chave: Arteria facial; Labios; Vascularización labial; Cirugía reconstructiva.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100007

Arterias Renales Múltiples
Provedor de dados: 77
Autores: Olave,E; Henríquez,J; Puelma,F; Cruzat,C; Soto,A.
El conocimiento de las variaciones de la irrigación renal es de mucha importancia debido al incremento de transplantes renales y cirugías de reconstrucción vascular. La literatura muestra que generalmente hay una arteria renal para cada riñon, sin embargo pueden observarse variaciones de origen y de número. Presentamos dos casos de arterias renales triples izquierdas, en muestras pertenecientes a la Unidad de Anatomía de la Facultad de Ciencias de la Salud, Universidad Católica del Maule, Talca. En uno de los casos, el origen de la arteria renal R1 (superior) se efectuó a nivel de la parte inferior del origen de la arteria mesentérica superior, la que después de un trayecto de 30 mm se dividió en dos ramas menores de calibre similar, que ingresaron en el...
Tipo: Journal article
Palavras-chave: Anatomía; Riñon; Arterias.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400040

[ARTÍCULO RETRACTADO] Descripción Anatómica del Esqueleto de Tiburón Mako (Isurus oxyrinchus)
Provedor de dados: 77
Autores: Astudillo Gajardo,Marla; Morales Muñoz,Pamela; Valenzuela,Maria Eugenia.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400006

Artificial neural network modeling studies to predict the yield of enzymatic synthesis of betulinic acid ester
Provedor de dados: 69
Autores: Moghaddam,Mansour Ghaffari; Ahmad,Faujan Bin H; Basri,Mahiran; Rahman,Mohd Basyaruddin Abdul.
3Î²-O-phthalic ester of betulinic acid was synthesized from reaction of betulinic acid and phthalic anhydride using lipase as biocatalyst. This ester has clinical potential as an anticancer agent. In this study, artificial neural network (ANN) analysis of Candida antarctica lipase (Novozym 435) -catalyzed esterification of betulinic acid with phthalic anhydride was carried out. A multilayer feed-forward neural network trained with an error back-propagation algorithm was incorporated for developing a predictive model. The input parameters of the model are reaction time, reaction temperature, enzyme amount and substrate molar ratio while the percentage isolated yield of ester is the output. Four different training algorithms, belonging to two classes, namely...
Tipo: Journal article
Palavras-chave: Acylation; Artificial neural network; Betulinic acid; Candida antarctica lipase; Enzymatic synthesis; Novozym 435.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300003

ARTROPODOS ASOCIADOS A SUELO DE RENOVALES DE NOTHOFAGUS OBLIQUA (MIRB.) OERSTED (FAGACEA) EN LA ZONA COSTERA DE LA VIII REGION
Provedor de dados: 72
Autores: Berrios,Patricia.
RESUMEN Se caracterizó la diversidad de artrópodos del suelo asociados a N. obliqua (Mirb.) Oersted en el "Fundo Universidad de Concepción". Para esto se realizaron muestreos de hojarasca en un área con predominio de roble chileno, durante las temporadas de invierno y primavera (junio a noviembre de 1997). Se determinó la riqueza específica y abundancias relativas de cada uno de los grupos que conforman esta comunidad. Los resultados muestran que tanto los ácaros Oribatida y Gamasida, como los Collembola fueron siempre los grupos que presentaron las mayores abundancias relativas. Por otro lado, la diversidad y la equidad disminuyeron paulatinamente desde el primer mes de muestreo (H'= 0.597 y J'= 0.574) hacia el final del estudio, en temporada estival (H'=...
Tipo: Journal article
Palavras-chave: Artrópodos; Diversidad; Hojarasca; Nothofagus obliqua.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100001

Arvejas (Pisum sativum) de Vaina Comestible Sugar Snap: Antecedentes y Comportamiento en el Sur de Chile
Provedor de dados: 113
Autores: Mera,Mario; Kehr,Elizabeth; Mejías,Jaime; Ihl,Mónica; Bifani,Valerio.
Las arvejas (Pisum sativum L.) “sugar snap” son el resultado de la combinación de al menos seis genes recesivos que controlan características de la vaina y el grano, y otros dos genes se están sumando en variedades modernas. Es un tipo de vaina comestible que, a diferencia de las “sinhilas”, tiene vainas de paredes engrosadas. Pueden consumirse en estado fresco o congelado y han tenido gran aceptación en Norteamérica y otros países. Seis genotipos provenientes de los Estados Unidos fueron evaluados en dos localidades de la Región de La Araucanía, Chile, durante 2004 y 2005. La mayoría de las variedades “sugar snap” dieron rendimientos similares a un cultivar para congelado utilizado como testigo. Las diferencias de rendimiento entre las variedades “sugar...
Tipo: Journal article
Palavras-chave: Vaina comestible; Arveja hortícola; Hortaliza congelable.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400002

Ascorbate protects (+)-catechin from oxidation both in a pure chemical system and human plasma
Provedor de dados: 48
Autores: LOTITO,SILVINA B; FRAGA,CESAR G.
We evaluated the interaction between ascorbic acid (AA) and (+)-catechin (CTCH) in potassium phosphate solution, pH 7.4 (PPS) and in human plasma. In both systems, the oxidation was started by adding 2,2’-azobis-(2-amidinopropane) clorhidrate (AAPH). The concentrations of AA and CTCH were determined by HPLC using electrochemical detection. In PPS, CTCH was oxidized by AAPH (50 muM), in either the absence or presence of different initial concentrations of AA (25-200 muM). In the presence of AA, CTCH depletion was delayed, an effect that was dependent upon the initial concentration of AA. When 100 muM AA was added after the oxidation had begun, CTCH depletion was arrested for 30 min. The kinetics of AA oxidation by AAPH was also characterized in PPS. AA (100...
Tipo: Journal article
Palavras-chave: Catechins; Antioxidants; Free radicals; Procyanidins.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200015

Asexual Recombination in a uvsH Mutant of Aspergillus nidulans
Provedor de dados: 48
Autores: SOUZA-JÚNIOR,S A; BECKER,T C A; CASTRO-PRADO,M A A.
Mutations in the gene uvsH of Aspergillus nidulans result in increased spontaneous chromosome instability and increased intragenic and intergenic mitotic recombination in homozygous diploids. The aim of the present work was to obtain a uvs mutant of A. nidulans and to use it for the isolation of asexual recombinants (parameiotic segregants). The mutant uvsH, named B511, showed normal frequency of meiotic recombination in sexual crosses and high frequency of parameiotic segregants in the parasexual crossings with master strains (B511//A757 and B511//A288). Asexual haploid recombinants (parameiotic segregants), diploid and aneuploid segregants were recovered directly from the uvs//uvs+ heterokaryons (B511//A757 and B511// A288). Parameiotic segregants...
Tipo: Journal article
Palavras-chave: Mitotic crossing-over; Parameiosis; Uvs mutation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000100007

Asimetría bilateral de la forma de las valvas y posición espacial en matrices del chorito Perumytilus purpuratus (Lamarck, 1819) (Bivalvia: Mytilidae)
Provedor de dados: 97
Autores: BRIONES,CAROLINA; GUIÑEZ,RICARDO.
De las distintas formas de la asimetría bilateral, la asimetría direccional (AD) ha recibido considerablemente menos atención en la literatura que la asimetría fluctuante (AF). Si bien existen buenos ejemplos de AD conspicua en algunos grupos de moluscos (e.g., Ostreidae y Pectinidae), para otros como los mitílidos la AD no ha sido reportada. En matrices del chorito Perumytilus purpuratus de tres localidades del intermareal rocoso de Chile norte y central, comparando individuos de los estratos superior e inferior, y usando dos índices de forma de la valva, reportamos evidencia de AD en relación con la forma de las valvas, tendiendo la derecha a ser consistentemente más elongada que la valva izquierda. Sin embargo, no solo en estratos inferiores de la...
Tipo: Journal article
Palavras-chave: Asimetría direccional; Asimetría fluctuante; Chorito; Mitílido; Forma de la concha.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000100001

Asimetría del Ventrículo Laríngeo: Un Estudio Anatómico Directo en Material Cadavérico
Provedor de dados: 77
Autores: Saldarriaga Tellez,Bladimir; Corzo Gómez,Edgar Giovanni; Niño,Oscar Javier; Forero Porras,Pedro Luis.
Por su localización anatómica en el cuello, su papel funcional en la respiración en la fonación y su importancia en los procesos de intubación endotraqueal, la caracterización morfológica de la laringe reviste gran importancia en el campo de la morfología, fonoaudiología y de especialidades clínicas como la otorrinolaringología y anestesia. En una muestra de 16 laringes fijadas en formol del anfiteatro de la Universidad Autónoma de Bucaramanga, se registraron las longitudes de las estructuras cartilaginosas, comparando el lado derecho y el lado izquierdo. No se encontraron diferencias significativas en las estructuras cartilaginosas de la laringe de acuerdo al lado (asimetría), excepto en la amplitud del ventrículo laríngeo. Se midió la profundidad del...
Tipo: Journal article
Palavras-chave: Ventrículo laríngeo; Asimetría laríngea; Morfometría láringea.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300045

ASIMETRIA FLUCTUANTE EN DOS POBLACIONES DE CEROGLOSSUS CHILENSIS (ESCBSCROLTZ, 1829) (COLEÓPTERA: CARABIDAE) EN EL AGROECOSISTEMA PINUSRADÍALA D. DON REGION DEL BIO-BIO, CHILE
Provedor de dados: 72
Autores: Benítez,Hugo; Briones,Raúl; Jerez,Viviane.
Para Ceroglossus chilensis se realizo un análisis de Asimetría Fluctuante (AF) en poblaciones presentes en plantaciones de Pinus radiata de diferentes edades y tipos de manejo, ubicadas en la cordillera de la costa y precordillera andina de la Región del Bío-Bío, Chile. El objetivo fue comparar en diferentes poblaciones de C. chilensis niveles de AF, a través de medidas del tercer segmento antenal. Para ello los insectos se recolectaron mediante trampas de intercepción entre diciembre 2004 y enero 2005, en plantaciones de 6-7, 10, 13 y 22-24 años. Nuestros resultados mostraron para el total de individuos (n = 128), diferencias significativas en los valores de AF en plantaciones de 6-7 (post primer raleo) y 10 años (previo raleo comercial) para ambas...
Tipo: Journal article
Palavras-chave: Pinus radiata; Agroecosistema; Asimetría; Adecuación biológica.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200003

Asimetría Fluctuante: Una herramienta morfo-funcional para Medir Estabilidad del Desarrollo
Provedor de dados: 77
Autores: Benítez,Hugo A; Parra,Luis E.
La capacidad de un organismo para producir un fenotipo ideal, pese a las perturbaciones encontradas durante su desarrollo, es el mecanismo causal de la estabilidad del desarrollo (ED). Esta capacidad es utilizada para evaluar variedad de tipos de estrés y la capacidad genotípica de corregirlos. La herramienta de medición más utilizada para estimar la ED es la asimetría fluctuante (AF), siendo esta una medida de las pequeñas desviaciones al azar que ocurren entre el lado izquierdo y derecho de rasgos bilateralmente simétricos. El estudio de AF, por su simplicidad de manejo y rapidez en la obtención de resultados, se ha convertido en un foco de interés para la biología, y durante los últimos años el aumento en artículos publicados usando AF para evaluar...
Tipo: Journal article
Palavras-chave: Inestabilidad del desarrollo; Selección Sexual; Genotipo; Fenotipo.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400066

Asn336 is involved in the substrate affinity of glycine oxidase from Bacillus cereus
Provedor de dados: 69
Autores: Wu,Gaobing; Zhan,Tao; Guo,Yiming; Kumar,Ashok; Liu,Ziduo.
Background: Glycine oxidase (GO), a type of D-amino acid oxidase, is of biotechnological interest for its potential in several fields. In our previous study, we have characterized a new glycine oxidase (BceGO) from Bacillus cereus HYC-7. Here, a variant of N336K with increased the affinity against all the tested substrate was obtained by screening a random mutant library of BceGO. It is observed that the residue N336 is invariable between its homogeneous enzymes. This work was aimed to explore the role of the residue N336 in glycine oxidase by site-directed mutagenesis, kinetic assay, structure modeling and substrate docking. Results: The results showed that the affinity of N336H, N336K and N336R increased gradually toward all the substrates, with increase...
Tipo: Journal article
Palavras-chave: Bacillus cereus; Error-prone PCR; Glycine oxidase; Site-directed mutagenesis; Substrate affinity.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400004

Asociación de Partición Hepática y Ligadura Portal para Hepatectomía por Etapas (ALPPS)
Provedor de dados: 77
Autores: Manterola,Carlos; Otzen,Tamara.
La disfunción hepática postoperatoria del remanente hepático que ocurre en pacientes sometidos a grandes resecciones hepáticas, es un problema complejo y temido, dado su pronóstico incierto. La asociación de partición hepática y ligadura portal para hepatectomía por etapas (ALPPS), es un enfoque novedoso para pacientes portadores de enfermedad hepática oncológica que anteriormente eran considerados "no resecables". El procedimiento se realiza en dos etapas. La primera, comprende la ligadura de la rama derecha de la vena porta. Luego, se realiza la transección del parénquima hepático; incluyendo o no, la sección y ligadura de la vena hepática media. A continuación se empaqueta el hígado tumoral en una bolsa de polietileno y el abdomen es cerrado. La segunda...
Tipo: Journal article
Palavras-chave: Neoplasia hepática; Metástasis hepáticas; Hígado metastásico; Hepatectomías; Trisegmentectomía derecha; Cáncer de la vesícula biliar; Insuficiencia hepática aguda; Ligadura de la vena porta; Regeneración hepática; ALPPS.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300043

Asociación entre el Color de la Peridermis de la Papa con Características de Importancia Industrial
Provedor de dados: 113
Autores: Andreu,Mario Alejandro; da Silva Pereira,Arione.
El color de la peridermis de los tubérculos de papa (Solanum tuberosum L.) es una característica de fácil evaluación, que podría ser usada en los programas de mejoramiento como marcador morfológico, una vez comprobada su asociación con otras características, principalmente las de calidad industrial. Con el objetivo de identificar el grado de asociación entre el color de la peridermis de los tubérculos de papa con la cantidad de materia seca y con el color de los chips, durante dos años se analizaron clones pertenecientes a seis cruzamientos biparentales entre variedades de peridermis colorada y amarilla y seis variedades comerciales. Por los resultados, los genotipos se diferenciaban en los promedios de las dos características mencionadas, comprobándose...
Tipo: Journal article
Palavras-chave: Mejoramiento; Industria; Calidad industrial.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000100009

ASOCIACIÓN ENTRE LA PÉRDIDA DEL CROMOSOMA X EN MUJERES DE EDAD AVANZADA Y EL POLIMORFISMO DE LA APOLIPOPROTEÍNA A-IV: 360 GLN/HIS
Provedor de dados: 77
Autores: Flank Ejchel,Tatiana; Quirino Araújo,Lara; Ramos,Luiz Roberto; Seabra Cendoroglo,Maisa; Rodriguez Burbano,Rommel; de Arruda Cardoso Smith,Marilia.
La pérdida del cromosoma X en mujeres, asociada a la edad avanzada, es un fenómeno ya reconocido hace décadas. Los factores genéticos que llevan a esta pérdida o a la no-disyunción cromosómica, son poco conocidos. Polimorfismos de apolipoproteínas fueron asociados a la ocurrencia de síndromes cromosómicos como las trisomías del 18 y 21 y fue sugerida su participación en la segregación cromosómica. Polimorfismos de la apolipoproteína AIV:360 fueron asociados a molestias cardiovasculares en la población brasileña.Veinticuatro mujeres entre 72 a 87 años, fueron seleccionadas para estudiar la presencia o ausencia del alelo 2 (HIS) y analizar la pérdida del cromosoma X. El análisis citogenético fue realizado en núcleos interfásicos de cultivos de linfocitos por...
Tipo: Journal article
Palavras-chave: Polimorfismo de la APOA-IV: 360 GLN/HIS; Pérdida del cromosoma X; Citogenética.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000200007

Asociación Panamericana de Anatomía: Reseña Histórica y Normativas Vigentes
Provedor de dados: 77
Autores: Losardo,Ricardo Jorge.
Se realiza una reseña de la trayectoria de la Asociación Panamericana de Anatomía considerando orígenes y objetivos, estructura organizativa, estatutos, congresos panamericanos, simposios iberolatinoamericanos de terminología y publicaciones oficiales, con motivo de transitar la cuarta década de su existencia ininterrumpida.
Tipo: Journal article
Palavras-chave: Anatomía; Asociación Panamericana de Anatomía.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400059

ASOCIADOS A PEUMUS BOLDUS MOL. EN LA RESERVA NACIONAL ISLA MOCHA. CHILE (INSECTA - COLEOPTERA)
Provedor de dados: 72
Autores: Mendoza,Gabriel; Jerez,Viviane.
Se analizó la composición taxonómica de coleópteros epígeos, asociados a la formación vegetal de Peumus boldus presente en la Reserva Nacional Isla Mocha (38º 19' S; 73º 55' W). El estudio se realizó en la primavera y comienzos del verano de 1998, mediante la colocación de 10 trampas Barber a lo largo de un transecto. Cada trampa permaneció en el sitio de muestreo durante 15 días consecutivos y el material recolectado se conservó en alcohol, para su posterior identificación. Los resultados indican que en la formación de P. boldus, el Orden Coleoptera está representado por 15 familias y 25 especies, siendo Germarostes posticus (Ceratocanthidae), Gnathotrupes corthyliformis (Scolytinae) y Aridius chilensis (Lathridiidae) las especies más abundantes. Se...
Tipo: Journal article
Palavras-chave: Isla Mocha; Coleópteros; Peumus boldus; Ceratocanthidae; Scolytinae; Lathridiidae.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200004

ASPECTOS ANATÓMICOS Y BIOMÉTRICOS DE LA INERVACIÓN DEL MÚSCULO CORACOBRAQUIAL Y SUS PUNTOS MOTORES
Provedor de dados: 77
Autores: Olave,Enrique.
El músculo coracobraquial está inervado por uno o dos ramos que le envía el nervio musculocutáneo. Con el propósito de obtener informaciones biométricas de la inervación de este músculo, estudiamos 42 miembros superiores, de 21 cadáveres de individuos adultos, brasileños, fijados en formol al 10%. Se realizó cuidadosa disección, poniendo énfasis en el nervio musculocutáneo y los ramos de inervación para el músculo coracobraquial, registrando su origen respecto a una línea transversal extendida entre los dos epicóndilos humerales (LBE), longitud, relación músculo-nervio respecto a LBE, subdivisión de sus ramos y localización de sus puntos motores en relación a esta línea. Encontramos sólo un ramo de inervación para este músculo, en 11 casos del lado...
Tipo: Journal article
Palavras-chave: Anatomía; Músculo coracobraquial; Inervación.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400014

Aspectos Anatómicos y Biométricos de los Puentes de Miocardio y sus Relaciones con la Arteria Interventricular Anterior y Venas Adyacentes
Provedor de dados: 77
Autores: Sousa-Rodrigues,C.F.; Alcantara,Soares de F.; Buarque,de Gusmão L.C.; Rocha,A. C. da; Alencar e Silva,R.; Olave,E.
Los vasos cardíacos pueden estar parcialmente cubiertos por puentes de miocardio, disposición que ha sido objeto de numerosos estudios. El objetivo del presente trabajo fue determinar la incidencia de estos puentes, su extensión y sobre que vasos se disponen, considerando principalmente las relaciones con los vasos interventriculares anteriores. El material estudiado fueron 30 corazones de individuos adultos, brasileños, fijados en formaldehído al 10 %. Se encontraron puentes de miocardio en 14 muestras (47 %) y de éstos, en 9 se localizaron por sobre la arteria interventricular anterior; en 3 casos se ubicaron simultáneamente sobre la arteria mencionada y sobre afluentes de la vena homónima; en 1 corazón puentes de miocardio se presentaron por sobre ramas...
Tipo: Journal article
Palavras-chave: Anatomía; Angiología; Corazón; Puentes de miocardio.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300025

Aspectos Anatómicos y Topográficos del Nervio Pudendo en la Región Glútea
Provedor de dados: 77
Autores: Gabrielli,Carla; Olave,Enrique.
El nervio pudendo distribuye ramos motores y sensitivos para la región perineal y órganos genitales externos. Tiene importancia funcional en la micción, defecación, erección y parto. Desde el punto de vista clínico, se realiza bloqueo anestésico del mismo en la práctica obstétrica, se electroestimula en casos de incontinencia fecal o urinaria, entre otros procedimientos. Investigaciones anatómicas han señalado que puede presentar variaciones en su conformación y topografía. Con el propósito de complementar el conocimiento sobre este nervio en su trayecto por la región glútea, se estudió su conformación, biometría y relaciones con los vasos pudendos internos y ligamentos adyacentes. Se disecaron 30 regiones glúteas de 15 cadáveres formolizados de individuos...
Tipo: Journal article
Palavras-chave: Anatomía; Región glútea; Nervio pudendo.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100029

ASPECTOS BIOLOGICOS DE EUPITHECIA SIBYLLA BUTLER 1882 (LEPIDOPTERA: GEOMETRIDAE)
Provedor de dados: 72
Autores: Vargas,Héctor A.; Parra,Luis E.; Vargas,Héctor E.; Bobadilla,Dante E.
Se describen la pupa y aspectos de la biología de Eupithecia sibylla Butler, 1882. La larva se alimenta de las plantas Prosopis sp. y Caesalpinia sp. (Fabaceae). Las larvas son parasitadas por el endoparasitoide Euphorocera peruviana Townsed (Diptera: Tachinidae). E. sibylla se distribuye entre los 19° a 37° S y entre los 600 y 2.500 msnm. Se ilustra la pupa y el imago
Tipo: Journal article
Palavras-chave: Estados inmaduros; Distribución; Parasitoide; Plantas hospederas; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200003

ASPECTOS BIOLOGICOS Y POBLACIONALES DE Nasonovia ribisnigri (Mosley) (HOMOPTERA: APHIDOIDEA) EN TRES VARIEDADES COMERCIALES DE LECHUGA (Lactuca sativa L.) EN CONDICIONES DE LABORATORIO
Provedor de dados: 113
Autores: Vasicek,Araceli; La Rossa,Francisco; Paglioni,Andrea.
En el presente trabajo se determinaron y compararon los principales parámetros biológicos y poblacionales del áfido Nasonovia ribisnigri sobre las variedades de lechuga (Lactuca sativa L.) Divina, Criolla Blanca y Cuatro Estaciones. Las cohortes fueron criadas a 10± 1ºC; 14:10 horas (fotofase: escotofase) y aproximadamente 90 % de humedad relativa. El período ninfal fue más largo sobre Criolla Blanca, oscilando entre 31 y 34 días, mientras que en las restantes duró entre 22 y 25 días. La duración del período reproductivo y la fecundidad fueron también mayores en Criolla Blanca. Los valores de la tasa de reemplazo (Ro) variaron entre 12,70 y 22,35 hembra/hembra para Criolla Blanca. En las variedades Cuatro Estaciones y Divina, dicho parámetro fue de 6,85 a...
Tipo: Journal article
Palavras-chave: Biología; Tablas de vida; Tasa intrínseca de crecimiento.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000400004

Aspectos Biométricos de la Mano de Individuos Chilenos
Provedor de dados: 77
Autores: Binvignat,O; Almagià,A; Lizana,P; Olave,E.
La mano es fundamental para ejecutar diversas acciones tanto en el campo laboral como en la entretención y el deporte, pudiendo realizar funciones muy básicas hasta otras muy especializadas. La función de la mano se puede analizar mejor cuando es dividida en partes, aunque es algo meramente didáctico y artificial, permitiendo una mejor comprensión en la actividad de la mano como una unidad. Debido a la importancia de esta parte del cuerpo y a la escasa información de parámetros biométricos que existe en nuestra población, se ha tornado necesario un estudio acabado sobre las dimensiones de la mano como un todo, así como también de sus componentes, los dedos. De acuerdo a ello, se analizaron 1.196 manos pertenecientes a habitantes de ambos sexos (267 hombres...
Tipo: Journal article
Palavras-chave: Mano; Dedos; Falanges Biometría.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200040

Aspectos Biométricos de las Arterias Cerebral Anterior en el Segmento Proximal (Al) y Carótida Interna
Provedor de dados: 77
Autores: Mandiola,Eduardo; Alarcón,Eduardo; Oñate,J. Carlos; Sanhueza,Pablo; del Sol,Mariano; Olave,Enrique.
La conformación del círculo arterial cerebral tiene relevancia en la clínica neuroquirúrgica por la relación compleja que presentan las arterias que lo originan y su gran variabilidad Debido a a esto, hemos decidido efectuar un análisis biométrico de las arterias cerebral anterior (Al) y de la arteria carótida interna (ACI) por posible asociación o correlación en estas estructuras. El trabajo se realizó en 36 cerebros disponibles en los laboratorios y cuyos datos bioantropológicos estaban registrados. El segmento Al de la arteria cerebral anterior derecha tuvo una longitud y calibre promedio de 12,86+1.58mm y 2,37±0,68mm, respectivamente. En el lado izquierdo la longitud y el calibre promedio de esta arteria fue 12,62+1.96mm y de 2,42±0,75mm,...
Tipo: Journal article
Palavras-chave: Arteria cerebral anterior; Círculo arterial del cerebro; Arteria carótida interna.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400038

Aspectos Biométricos del Canal Mandibular
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Morales Herrera,Carlos Andrés; Cantín López,Mario Gonzalo; Zavando Matamala,Daniela Alejandra.
El canal mandibular recorre este hueso longitudinalmente, relacionándose en su segmento medio con las piezas dentarias molares y premolares. El conocimiento de la relación del canal mandibular con las piezas dentarias y con las corticales mandibulares es de gran importancia para la práctica de la implantología. En el presente estudio se analizan las relaciones de la porción media del canal mandibular con las corticales mandibulares pertenecientes a individuos de sexo femenino, de entre 50 y 65 años, con caracterización antropométrica coincidente con el registro. Se realizaron mediciones en tres niveles del segmento medio (A-B-C). Los resultados muestran que el canal mandibular presenta una forma ovoidea y que sus diámetros disminuyen a medida que desciende...
Tipo: Journal article
Palavras-chave: Anatomía; Biometría; Canal mandibular.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400021

Aspectos Biométricos y Morfológicos del Pericardio Fibroso y Diafragma en el Hombre
Provedor de dados: 77
Autores: Binvignat,Octavio; Olave,Enrique.
El pericardio es una membrana fibro-serosa que envuelve al corazón y a la porción yuxtacardíaca de los grandes vasos. Realizamos un estudio del pericardio y del diafragma, registrando sus dimensiones, sus relaciones, así como también, establecer el tipo de conexiones existente entre ambas estructuras. Fueron disecadas 142 regiones mediastínicas de cadáveres sin fijación o con fijación en formaldehído al 10%, brasileños, adultos, de ambos sexos, de edades comprendidas entre los 18 y 70 años, fallecidos de diferentes causas. Para el estudio histológico, del conjunto pericardio y diafragma fueron retirados cinco fragmentos de diferentes regiones: anterior próxima al esternón (región 1), lateral izquierda próxima al ápice del corazón (región 2), posterior...
Tipo: Journal article
Palavras-chave: Anatomía; Diafragma; Morfología; Biometría.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300033

Aspectos Clínicos y Morfológicos de los Dientes Supernumerarios
Provedor de dados: 77
Autores: Alves,N; de Oliveira Nascimento,C.M; Olave,E.
La hiperdoncia es una anomalía dentaria de causa desconocida, caracterizada por el aumento del número de dientes. Ocurre con mayor frecuencia en la maxila, de preferencia en el sexo masculino, siendo más común en la dentición permanente. La presencia de dientes supernumerarios puede ser responsable por alteraciones en la dentición permanente, como por ejemplo, el atraso en la erupción y dislocamientos. Además, el paciente puede presentar oclusión anormal, reabsorción de dientes adyacentes y formación de quistes. El presente artículo describe en un paciente de sexo masculino, de 9 años de edad, la presencia de dos incisivos laterales superiores derechos y un incisivo lateral superior izquierdo, permanentes, parcialmente erupcionados. El examen radiológico...
Tipo: Journal article
Palavras-chave: Anatomía; Dientes supernumerarios; Dentición mixta; Incisivos laterales suplementarios; Anomalía dentaria.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300064

Aspectos dietarios de Alsodes coppingeri Günther, 1881 (Anura: Alsodidae) en Chile
Provedor de dados: 72
Autores: ALVEAL,NICZA; DÍAZ-PÁEZ,HELEN; HENRÍQUEZ,ANA; VERGARA,OLIVIA.
Los estudios relacionados con la composición dietaria de los anuros presentes en Chile son un campo escasamente explorado y que permiten aportar con conocimiento sobre la biología de las especies. Alsodes coppingeri habita los arroyos de montaña de los bosques templados de Nothofagus de la Patagonia chilena. Estos anuros han sido encontrados bajo troncos en los márgenes de arroyos. Para este estudio se analizaron 44 especímenes de A. coppingeri provenientes de Laguna Caiquenes, Caleta Tortel y Villa O&amp;#8217;Higgins (Región de Aysén, Chile). Los ítems presa fueron clasificados a nivel ordinal y se estimó la frecuencia de ocurrencia, de abundancia e índice de importancia relativa (IRI). Se determinó un 70,5% de frecuencia de ocurrencia, donde la dieta de...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100002

Aspectos Moleculares en la Formación de la Cara y del Paladar
Provedor de dados: 77
Autores: Montenegro,María Angélica; Rojas,Mariana.
En mamíferos, la adhesión y fusión de los procesos faciales y palatinos, son mecanismos esenciales en el desarrollo del paladar primario y secundario. La falla de cualquiera de estos procesos trae como consecuencia la formación de labio leporino o fisura palatina. En ambos casos, los procesos opuestos adhieren a través de desmosomas para formar una lámina epitelial media la cual desaparece por transformación epitelio-mesenquimática. La apoptosis ocurre sólo en las células del periderma. En el paladar secundario, estos procesos están regulados por TGFß-3, pero este factor no está presente en los procesos maxilares o nasales que forman el paladar primario, por lo cual en la formación del labio actuarían otros factores tales como Shh (sonic hedgehog) y BMP...
Tipo: Journal article
Palavras-chave: Paladar de ratón; Labio de pollo; TGFß-3; Shh; Transformación epitelio-mesenquimática.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200014

Aspects of the Macro and Microscopic Anatomy of the Sciatic Nerve in Wistar Rats
Provedor de dados: 77
Autores: Suaid,Carla Adelino; Santos,Ana Paula; Yamane,Fernanda de Oliveira; Fazan,Valéria Paula Sassoli; Barreira,Amilton Antunes.
The present study seeks to systematize morphological and morphometrical parameters and brings new data on the main branch of the lumbosacral plexus ­ i.e., sciatic nerve ­ in Wistar rats aged four and seven weeks. Sixteen female were divided into two groups, namely animals aged four weeks, and animals aged seven weeks. The specimens were studied at proximal and distal segments of the right hind limb sciatic nerves. Semi-thin transverse sections (0.25 µm thickness) were stained with 1 % toluidine blue, and the morphometric analysis was processed through the KS 400 software. Except for the number of fascicles and fascicular diameter, no differences were found between the proximal and distal segments. We observed differences when morphometric values were...
Tipo: Journal article
Palavras-chave: Rat sciatic nerve; Myelinated nerve fibers; Capillaries; Anatomy and histology; Animal experimental use.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300010

Aspergillus kawachii produces an inulinase in cultures with yacon (Smallanthus sonchifolius) as substrate
Provedor de dados: 69
Autores: Chesini,Mariana; Neila,Lorena Paola; de la Parra,Dante Fratebianchi; Rojas,Natalia Lorena; Contreras Esquivel,Juan Carlos; Cavalitto,Sebastian Fernando; Ghiringhelli,Pablo Daniel; Hours,Roque Alberto.
Background: Inulinases have been extracted and characterized from inulin-storing tissues; however, production of microbial inulinases have recently draw much attention as they offer several industrial advantages. Many microorganisms, including filamentous fungi, yeast and bacteria have been claimed as inulinase producers. These hydrolases are usually inducible and their exo-acting forms may hydrolyze fructose polymers (inulin) and oligosaccharides such as sucrose and raffinose. Fungal inulinase extracts are often produced as stable mixture of highly active fructanhydrolases. From a practical prospective, the best known inulinases to date are those produced by species of Penicillium, Aspergillus and Kluyveromyces. Results: The production of extracellular...
Tipo: Journal article
Palavras-chave: Acidophilic enzymes; Batch cultures; Inulin degradation; Submerged cultures.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300008

Asplenium patagonicum (Aspleniaceae, Pteridophyta) nueva especie para Chile
Provedor de dados: 73
Autores: Rodríguez Ríos,Roberto; Guzmán-Marín,Rosario.
ABSTRACT A new Chilean species, Asplenium patagonicum (Aspleniaceae, Pteridophyta), on the basis of the collections of vascular plants of South Chile is described. This Chilean fern has been reclassified from Asplenium monanthes L., given their differences in geographic distribution and morphological features. While A. patagonicum occurs in South Chile, A. monanthes presents a tropical distribution. The latter also is clearly distinguished from A. patagonium given its smaller size and different shape in their pinna; small, non-linear, and deltoid rhizome scales, and shorter general size.
Tipo: Journal article
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100229

Assesing Bemisia tabaci (Genn.) biotype B resistance in soybean genotypes: Antixenosis and antibiosis
Provedor de dados: 117
Autores: Gonçalves Franco da Silva,José Paulo; Lopes Baldin,Edson Luiz; Santana de Souza,Efrain; Lourenção,André Luiz.
Since it was first reported in Brazil in the 1990s, the B biotype of silverleaf whitefly (Bemisia tabaci Genn., Hemiptera: Aleyrodidae) has been recognized as an important pest in soybeans (Glycine max L.), reducing the productivity of this legume species in some areas of the country. As an alternative to chemical control, the use of resistant genotypes represents an important tool for integrated pest management (IPM). This study evaluated the performance of 10 soybean genotypes prior to whitefly infestation, by testing attractiveness and preference for oviposition in the greenhouse and antibiosis in the laboratory. In a multiple-choice test, 'IAC-17' was the least attractive to insects. In a no-choice test, 'IAC-17' was the least attractive for egg...
Tipo: Journal article
Palavras-chave: Glycine max; Silverleaf whitefly; Host plant resistance; Attractiveness; Non-preference; Trichome.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400009

Assessing long- and short-term trends in cereal yields: the case of Chile between 1929 and 2009
Provedor de dados: 118
Autores: Engler,Alejandra; del Pozo,Alejandro.
Cereal grain yields have increased worldwide during the 20th century as a consequence of plant breeding, improved cultural practices and intensive use of inputs. However, there is evidence that there are differences in yield pattern evolution across countries and cereals. The purpose of this study was to compare trends in the yields of the most commonly produced cereals in Chile, namely wheat, oat, barley, maize and rice, to identify similarities in trends across crops and to estimate long-term growth rates in the yields and their changes over time. Data for wheat, barley, oat, rice and maize yields between 1929 and 2009 were obtained from the Chilean Oficina de Estudios y Políticas Agrarias (ODEPA). A first-order autoregressive (AR1) model with trend was...
Tipo: Journal article
Palavras-chave: Barley; Oat; Maize; Rice; Wheat; Yield progress.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100005

Assessing the Transferability of Transpiration-use Efficiency Models of Biomass Production
Provedor de dados: 117
Autores: Kremer,Cristián; Stöckle,Claudio.
Transpiration-use efficiency (w), defined as the ratio of biomass produced per unit water transpired, has been used to evaluate crop performance under limited water supply. However, the lack of consistency of w values through different environmental conditions has not allowed, using it as a transferable parameter. Thus, simple approaches have been developed, including: 1) w = kDa Da¹ and; 2) w = kEto ETo-¹ where kDa and kETo are crop-dependent parameters, with the underlying concept that normalization by Da or ET0 would accounts for the effects of climate variations on w, while these parameters would be reasonably constant across diverse environments. The objective of this study was to assess the transferability of kDa and kET&amp;#094;0 for wheat...
Tipo: Journal article
Palavras-chave: Transpiration-use efficiency; Models of biomass production.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100002

Assessing understory development in forest plantations using laser imaging detection and ranging (LiDAR)
Provedor de dados: 97
Autores: HERNÁNDEZ,JAIME; ACUÑA,M. PAZ; CORVALÁN,PATRICIO; SIMONETTI,JAVIER A.
Forestry plantations are expected to be managed in ways to conserve biodiversity while producing goods and services. This goal implies a significant challenge as plantations tend to reduce species richness. The presence of well developed understory enhances the value of plantations as habitat for native fauna. Here, we develop a straightforward method to assess the availability of understory in forestry stands using laser imaging detection and ranging (LiDAR) data and aerial RGB high resolution images. Based on field and airborne acquired data for Pinus radiata stands in central Chile, the digital crown model (DCM), derived from the subtraction of the digital terrain model (DTM) from the digital surface model (DSM) is a more reliable predictor of...
Tipo: Journal article
Palavras-chave: Forestry plantations; Kriging; LiDAR; Pinus radiata; Understory height.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400005

Assessment of allelopathic properties of Aloe ferox Mill. on turnip, beetroot and carrot
Provedor de dados: 48
Autores: Arowosegbe,Sunday; Afolayan,Anthony J.
Turnip (Brassica rapa var. rapa L.), beetroot (Beta vulgaris L.) and carrot (Daucus carota L.) are common vegetables in South Africa. The allelopathic potential of aqueous leaf and root extracts of Aloe ferox Mill.- a highly valued medicinal plant- was evaluated against seed germination and seedling growth of the three vegetables in Petri dish experiments. The extracts were tested at concentrations of 2, 4, 6, 8, and 10 mg/mL. Leaf extract concentrations above 4 mg/mL inhibited the germination of all the crops, while the root extract had no significant effect on germination irrespective of concentration. Interestingly, the lowest concentration of leaf extract stimulated root length elongation of beetroot by 31.71%. Other concentrations significantly...
Tipo: Journal article
Palavras-chave: Allelopathy; Aloe ferox; Aqueous extracts; Intercrops; Vegetable crops.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000400006

Assessment of Antimicrobial Activity and Healing Potential of Mucous Secretion of Achatina fulica
Provedor de dados: 77
Autores: Santana,Wagno Alcântara; Melo,Cláudia Moura de; Cardoso,Juliana Cordeiro; Pereira-Filho,Rose Nely; Rabelo,Alessandra Silva; Reis,Francisco Prado; Albuquerque-Júnior,Ricardo Luiz Cavalcanti de.
Achatina fulica's secretion has been recently related to antibacterial, antifungal, and cicatricial properties, and it is influenced by the kind of food offered. Therefore, this study investigated the healing potential of dressing films based on mucous secretion of Achatina fulica. Thus, surgical wounds performed in black wistar rats were dressed with films based on collagen, and on mucous secretion of A. fulica fed with Lactuca sativa; undresses worked as wounds control. After 3, 7, 14 and 21 days the animals were euthanized, and the wounds were microscopically evaluated. On the 3rd and 7th days dressing films based on mucus provided acceleration of the formation maturation of granulation tissue, better epithelization rates, and more rapid replacement of...
Tipo: Journal article
Palavras-chave: Wound healing; Wound dressing; Land snails; Mucus.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200001

Assessment of Blood Chemistry, Weight Gain and Linear Body Measurements of Pre-Puberal Buck Rabbits Fed Different Levels of Neem (Azadirachta indica A. Juss.) Leaf Meals
Provedor de dados: 117
Autores: Ogbuewu,I.P; Uchegbu,M.C; Okoli,I.C; Iloeje,M.U.
A 16 week feeding trial was carried out to investigate the effect of dietary Neem (Azadirachta indica A. Juss.) leaf meal (NLM) on body weight gain, linear body measurements and blood chemistry of pre-puberal buck rabbits. Four treatment diets were formulated to contain the NLM at inclusion levels of 0 (control), 5, 10 and 15%. Thirty six crossbred New Zealand white × Chinchilla pre-puberal buck rabbits aged 5 to 6 mo were divided into four groups of nine rabbits and each group was further replicated into three of three rabbits each. The rabbits were randomly assigned to the four dietary treatments. Lymphocyte count of rabbits fed control diet (8.32 × 10(9) mm-3) was significantly higher than the group fed 15% NLM (4.60 × 10(9) mm-3). The mean cell...
Tipo: Journal article
Palavras-chave: Neem leaf meal; Body weight gain; Blood chemistry; Linear body measurements; Buck rabbits.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300020

Assessment of changes in the brca2 and p53 genes in breast invasive ductal carcinoma in northeast Brazil
Provedor de dados: 48
Autores: Ramalho,Eduardo AVF; Silva-Filho,João LQ; Cartaxo,Marina FS; Cavalcanti,Carmelita BL; Rêgo,Moacyr JBM; Oliveira,Maria BM; Beltrão,Eduardo IC.
BACKGROUND: BRCA protein interacts with at least 13 different proteins that have been implicated with cancer susceptibility and loss of BRCA function is correlated to sensitivity to DNA crosslinking agents in preclinical models. RESULTS: BRCA2 methylation frequency was 44%, p53 Pro22 allele frequency was 32% and heterozygous frequency of Arg/Pro72 genotype was 60% which could be associated as risk factor for metastasis (p = 0.046 OR = 4.190). Regarding to polymorphism of codon 249 the frequency of Arg249 allele presented 82% which was considered not statistically significant. CONCLUSIONS: There was not statistical significance to BRCA2 promoter methylation with any parameters chosen. However, our findings suggest that patients who present heterozygous...
Tipo: Journal article
Palavras-chave: Breast cancer; Epigenetics; Metastasis; Methylation; Polymorphism.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100003

Assessment of genetic diversity among Pakistani wheat (Triticum aestivum L.) advanced breeding lines using RAPD and SDS-PAGE
Provedor de dados: 69
Autores: Ahmed,Muhammad Farooq; Iqbal,Muhammad; Masood,Muhammad Shahid; Rabbani,Malik Ashiq; Munir,Muhammad.
Genetic diversity was assessed among 32 advanced wheat breeding lines included in the National Uniform Wheat Yield Trials (2006-07) of Pakistan using molecular (DNA) and biochemical (SDS-PAGE) markers. Of the 72 RAPD primers used for initial screening, 15 were found polymorphic. A total of 140 bands (61.4% polymorphic) were generated by the 15 random decamer primers. Genetic similarity coefficients ranged from 0.81 to 0.94 for rainfed and from 0.70 to 0.93 for the normal seeding date group. Cluster analysis using the unweighted pair group method of arithmetic averages (UPGMA) clustered the 32 advanced wheat breeding lines into one major and three small groups. Maximum level of polymorphism (90%) was observed for the primer OPA-05. Lines N9 and N11 showed...
Tipo: Journal article
Palavras-chave: Genetic diversity; Molecular markers; Polymorphism; RAPD; SDS-PAGE; Wheat.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300001

Assessment of genetic diversity and relationships among Osmanthus fragrans cultivars using AFLP markers
Provedor de dados: 69
Autores: Yuan,Wang Jun; Han,Yuan Ji; Dong,Mei Fang; Shang,Fu De.
This study was conducted to reveal genetic diversity among 100 Osmanthus fragrans cultivars using amplified fragment length polymorphism (AFLP) markers. Eight AFLP primer combinations produced a total of 443 polymorphic fragments with an average of 64 per primer combination. The percentage of polymorphic bands (86.81%), the resolving power (Rp) (32.71) and the PIC values (0.331) showed the efficiency of used primer combinations. The revealed AFLP makers were effective in distinguishing all the cultivars considered. Cluster analysis were performed to assess patterns of diversity among cultivars and showed the abundant genetic diversity. The overall distribution pattern of molecular variation suggested that 93.33% of the total genetic variance was within the...
Tipo: Journal article
Palavras-chave: AFLP marker; Cluster analysis; Genetic diversity; Osmanthus fragrans.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100002

Assessment of genetic diversity in sesame (Sesamum indicum L.) detected by Amplified Fragment Length Polymorphism markers
Provedor de dados: 69
Autores: Ali,Ghulam M; Yasumoto,Sirato; Seki-Katsuta,Masumi.
Sesame (Sesamum indicum L.) is one of the oldest oil crops and is widely cultivated in Asia and Africa. To determine the level of genetic diversity in relation to geographical origins and morphological characteristics, a total of 96 accessions have been collected from different parts of the world and were analyzed using AFLP techniques. Twenty-one primer pairs generated a total of 445 bands and among them 157 (35%) were polymorphic. Using UPGMA clustering analysis method based on the similarity coefficient, accessions were separated into two major groups. The first group mostly consists of Eastern Asian origin and another group consists of South Asian origin. Sub-clusters separated the accessions and form distinct diversity among groups. Considering the...
Tipo: Journal article
Palavras-chave: AFLP; Genetic diversity; Geographical origin; Morphology; Sesame.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100002

Assessment of genetic diversity in Venezuelan rice cultivars using simple sequence repeats markers
Provedor de dados: 69
Autores: Ghneim Herrera,Thaura; Posso Duque,Duina; Pérez Almeida,Iris; Torrealba Núñez,Gelis; Pieters,Alejandro J; Martinez,César P; Tohme,Joe M.
In Venezuela, pedigree analyses indicate that the rice varieties currently under cultivation are closely related. Effective breeding programs, based on knowledge of the genetic diversity of cultivars, are needed to broaden the genetic bases of rice germplasm in the country. In this study, we used a set of 48 simple-sequence-repeat (SSR) markers to assess the genetic diversity of 11 Venezuelan rice cultivars, released by the National Rice Breeding Program between 1978 and 2007. A total of 203 alleles were detected, the number of alleles (NA) per marker ranged from 2 to 9, with an average of 4.23. The average genic diversity (H) over all SSR loci for the 18 genotypes was 0.524, ranging from 0.105 to 0.815. Positive correlations were found between H at each...
Tipo: Journal article
Palavras-chave: DNA fingerprinting; Genetic diversity; Rice; SSR.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500003

Assessment of genetic structure in Mexican charolais herds using microsatellite markers
Provedor de dados: 69
Autores: Sifuentes-Rincón,Ana María; Puentes-Montiel,Herlinda; Parra-Bracamonte,Gaspar Manuel.
Knowledge of livestock genetic diversity is an essential step to respond to commercial demands and reach production objectives in different environments and production systems. The evaluation of animal genetic diversity is achieved by using molecular markers. Microsatellites are the most used markers for studies of this type. Eleven microsatellites were used to evaluate the genetic variation from three populations of Charolais cattle located in northeast Mexico. The studied populations exhibited a high allelic variability with a mean heterozygosity of 0.5. A moderate genetic differentiation between the Charolais populations (F ST = 0.079; P &lt; 0.001) was observed. This suggests subdivisions in Charolais breed established in Mexico, due to genetic...
Tipo: Journal article
Palavras-chave: Charolais; Genetic diversity; Microsatellite.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400002

Assessment of Grenada’s capacity to implement the Biosafety Protocol
Provedor de dados: 69
Autores: De Vere Pitt,James; Roberts,Dianne.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200002

Assessment of Mesial Root Morphology and Frequency of MB2 Canals in Maxillary Molars using Cone Beam Computed Tomography
Provedor de dados: 77
Autores: Abarca,J; Gómez,B; Zaror,C; Monardes,H; Bustos,L; Cantin,M.
The aim of this study was to assess the morphology of the mesial root canal system of maxillary molars and the frequency of MB2 canals using cone-beam computed tomography (CBCT). A total of 1374 teeth, first maxillary (1MS, n= 802) and second maxillary molars (2SM, n= 572) of 508 Chilean patients between 8 to 77 years were evaluated through CBCT. The mesiobuccal root was evaluated in all three thirds. Root canal morphology was classified according to Vertucci's method. Data were analyzed by Pearson's Chi-square and Cuzick trend tests. MB2 canal frequency in 1MS was 73.44% and in 2MS 42.48%. The most frequent morphology in 1MS and 2MS were Vertucci type II and I, respectively. No statistically significant association was found between frequencies and side...
Tipo: Journal article
Palavras-chave: CBCT; Secondary mesiobuccal canal; MB2; Maxillary molars; Root canal system.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400023

Assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletion
Provedor de dados: 69
Autores: Vargas,Gustavo; Donoso-Bravo,Andrés; Vergara,Christian; Ruiz-Filippi,Gonzalo.
Background: Industrial wastewaters with a high content of nitrogen are a relevant environmental problem. Currently, treatments to remove nitrogen are not efficient, so is necessary to develop alternative methods. The objective of this study is to investigate a consortium of microalgae - nitrifying, that due to the symbiosis between them could be an interesting alternative. Results: In this study, it was possible to obtain a consortium of nitrifying bacteria (NB) and microalgae (MA) capable of operating with low requirements of dissolved oxygen, using aerobic sludge from wastewater treatment plants. During the operation, this consortium presents removal percentages above 98% of ammonia, even at concentrations of DO of 0.5 mg O2 L-1. It is estimated that the...
Tipo: Journal article
Palavras-chave: Ammonium; Consortium nitrifying-microalgae; Oxygen; Respirometry.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500007

Assessment of molecular recognition element for the quantification of human epidermal growth factor using surface plasmon resonance
Provedor de dados: 69
Autores: Rosti,Ira Amira; Ramanan,Ramakrishnan Nagasundara; Ling,Tau Chuan; Ariff,Arbakariya B.
Background: A method for the selection of suitable molecular recognition element (MRE) for the quantification of human epidermal growth factor (hEGF) using surface plasmon resonance (SPR) is presented. Two types of hEGF antibody, monoclonal and polyclonal, were immobilized on the surface of chip and validated for its characteristics and performance in the quantification of hEGF. Validation of this analytical procedure was to demonstrate the stability and suitability of antibody for the quantification of target protein. Results: Specificity, accuracy and precision for all samples were within acceptable limit for both antibodies. The affinity and kinetic constant of antibodies-hEGF binding were evaluated using a 1:1 Langmuir interaction model. The model...
Tipo: Journal article
Palavras-chave: Antibody; BIAcore; Biosensors; Epidermal growth factor; Validation.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600015

Assessment of pharmacological activities of two medicinal plant of Bangladesh: Launaea sarmentosa and Aegialitis rotundifolia roxb in the management of pain, pyrexia and inflammation
Provedor de dados: 48
Autores: Raju,Golam Sarwar; Moghal,Md Mizanur Rahman; Hossain,Mohammad Salim; Hassan,Md Mahadi; Billah,Md Mustahsan; Ahamed,Sayed Koushik; Rana,SM Masud.
BACKGROUND: The current study aims at evaluating the analgesic, anti-pyretic and anti-inflammatory properties of methanolic extract of the stem, bark and leaves of Launaea sarmentosa and Aegialitis rotundifolia roxb. RESULTS: The AELS and AEAR extract presented a significant (***p &lt; 0.001) dose dependent increase in reaction time in writhing method and showed inhibition of 63.1% and 57.1% respectively at the doses of 400 mg/kg body weight while standard drug showed (P &lt; 0.001) inhibition of 69.23%. In tail immersion method, AELS and AEAR showed maximum time of tail retention at 30 min in hot water i.e. 6.93 sec and 6.54 sec respectively at highest doses of 400 mg/kg body weight than lower dose while standard pentazocine showed reaction time of 7.62...
Tipo: Journal article
Palavras-chave: Launaea sarmentosa; Aegialitis rotundifolia roxb; Analgesic; Antipyretic; Anti-inflammatory.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100049

Assessment of somaclonal variation in somatic embryo-derived plants of yacon [Smallanthus sonchifolius (Poepp. and Endl.) H. Robinson] using inter simple sequence repeat analysis and flow cytometry
Provedor de dados: 69
Autores: Viehmannova,Iva; Bortlova,Zuzana; Vitamvas,Jan; Cepkova,Petra Hlasna; Eliasova,Katerina; Svobodova,Eva; Travnickova,Martina.
Background Yacon (Smallanthus sonchifolius) is a root crop native to the Andean region. Low sexual reproductive capacity is a major constraint facing the genetic breeding of this crop. Biotechnological techniques offer alternative ways to widen genetic variability. We investigated somaclonal variation in regenerants of yacon derived from in vitro somatic embryogenesis using simple sequence repeat (ISSR) analysis and flow cytometry. Results Twenty tested ISSR primers provided a total of 7848 bands in 60 in vitro regenerants and control plant. The number of bands for each primer varied from 3 to 10, and an average of 6.95 bands was obtained per ISSR primer. Eight primers were polymorphic and generated 10 polymorphic bands with 7.19% mean polymorphism. ISSR...
Tipo: Journal article
Palavras-chave: DNA polymorphism; Molecular markers; Ploidy level; Proembryogenic callus.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000200008

Assessment of Spermatozoa Morphology under Light Microscopy with Different Histologic Stains and Comparison of Morphometric Measurements
Provedor de dados: 77
Autores: Aksoy,Emine; Aktan,Tahsin Murad; Duman,Selcuk; Cuce,Gokhan.
The aim was to examine the morphology of spermatozoa with different staining methods and aimed to find the better staining methods for morphology of spermatozoa in our study. Randomized 67 patients taken for the study who were admitted to Assisted Reproductive Techniques Unit. In the first part of the study, smears were stained with Hematoxylin Eosin (HE), Toluidin Blue (TB), Giemsa, Wright, ferrous Weigert haematoxylin stain, Orange G, eosin-aniline blue dye, Shorr Method, Papanicolau, Berg Method, Light Green stain, Acridine Orange (AO) and Janus Green dyes. In the second part of the study, smear preparations of 10 patients with normozoospermic were stained with HE, Toluidin Blue (TB), Shorr Method and Papanicolau. Four measurements were made including...
Tipo: Journal article
Palavras-chave: Spermatozoa; Morphology; Histological stains.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400045

Assessment of the efficiency in trapping North American mink (Neovison vison) for population control in Patagonia
Provedor de dados: 97
Autores: Medina-Vogel,Gonzalo; Barros,Macarena; Monsalve,Rene; Pons,Daniel J.
BACKGROUND: Introduced species can have a major negative impact on biodiversity; an example is the American mink, which was introduced in the 1930s in Patagonia. While there is a consensus that reversing alien mustelids continental scale invasions remains unfeasible, there is little consensus, given a maximum cost or investment, on the feasibility and efficiency of region-wide control or eradication. Thus, our goal was to provide information about efficiency for mink control in Patagonia METHODS: Between January 2009 and February 2013 this study was conducted in ten study sites (4 km to 15 km long) between 39°S to 45°S latitude. Minks were trapped using cage traps operated by two trappers. We estimated the population density at each study site assuming...
Tipo: Journal article
Palavras-chave: American mink; Trapping efficiency; Control; Population modeling.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2015000100009

Assessment of the phytochemical constituents and antioxidant activity of a bloom forming microalgae Euglena tuba
Provedor de dados: 48
Autores: Chaudhuri,Dipankar; Ghate,Nikhil Baban; Deb,Shampa; Panja,Sourav; Sarkar,Rhitajit; Rout,Jayashree; Mandal,Nripendranath.
BACKGROUND: Unstable generation of free radicals in the body are responsible for many degenerative diseases. A bloom forming algae Euglena tuba growing abundantly in the aquatic habitats of Cachar district in the state of Assam in North-East India was analysed for its phytochemical contents, antioxidant activity as well as free radical scavenging potentials. RESULTS: Based on the ability of the extract in ABTS•+ radical cation inhibition and Fe3+ reducing power, the obtained results revealed the prominent antioxidant activity of the algae, with high correlation coefficient of its TEAC values to the respective phenolic and flavonoid contents. The extract had shown its scavenging activity for different free radicals and 41.89&amp;#8201;±&amp;#8201;0.41...
Tipo: Journal article
Palavras-chave: Euglenoid; Phytochemicals; Free radical scavenging; Antioxidant; Reducing power.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100024

Assessment of toxicity of a biosurfactant from Candida sphaerica UCP 0995 cultivated with industrial residues in a bioreactor
Provedor de dados: 69
Autores: Bezerra de Souza Sobrinho,Humberto; de Luna,Juliana Moura; Rufino,Raquel Diniz; Figueiredo Porto,Ana Lúcia; Sarubbo,Leonie Asfora.
Background: The aim of the present study was to propose a low-cost method for the production of a biosurfactant by the yeast Candida sphaerica and assess its toxicity and phytotoxicity. The medium was formulated with distilled water supplemented with residue from a soy oil refinery (5%) and corn steep liquor (2.5%) as substrates. These two products were the sources of carbon and nitrogen as well as mineral elements to encourage the growth of the microorganism and production of a biosurfactant. Results: The isolated biosurfactant yield was 6.364 g/l. The biosurfactant exhibited an excellent ability to reduce surface tension (26 mN/m) and demonstrated no toxicity against seeds of Brassica oleracea, Chicoria intybus and Solanum gilo or the micro crustacean...
Tipo: Journal article
Palavras-chave: Biosurfactant; Bioreactor; Candida sphaerica; Industrial residues; Toxicity.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400004

Assimilation efficiency in Bufo spinulosus tadpoles (Anura: Bufonidae): effects of temperature, diet quality and geographic origin
Provedor de dados: 97
Autores: BENAVIDES,A. GONZALO; VELOSO,ALBERTO; JIMÉNEZ,PAULINA; MÉNDEZ,MARCO A.
The assimilation efficiency of Bufo spinulosus tadpoles from four localities in Chile was evaluated for two different temperatures (15 and 25 ºC) and two different diets (low nutritional quality diet (LQD): 22.28 mg g N-1; high nutritional quality diet (HQD): 47.53 mg g N-1) using ash as a marker of digestion. Results showed that geographic origin did not affect assimilation efficiency, while the relationship observed between temperature and diet quality was significant. Assimilation efficiency was greater for the HQD when tadpoles were maintained at 15 °C, instead significant differences were not found between diets for tadpoles maintained at 25 °C. Our results suggest that the effect of temperature on digestive processes is more relevant than its effect...
Tipo: Journal article
Palavras-chave: Bufo spinulosus; Tadpoles; Assimilation; Temperature effects; Diet quality effects; Geographic origin effects.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200013

Association between AA-NAT gene polymorphism and reproductive performance in sheep
Provedor de dados: 69
Autores: Ding-ping,Bai; Cheng-jiang,Yu; Yu-lin,Chen.
Arylalkylamine N-acetyltransferase (AA-NAT) is critical enzyme in Melatonin (MLT) biosynthesis for MLT regulating the animal seasonal breeding. In this study, DNA sequencing methods were applied to detect the polymorphisms of the AA-NAT gene in 179 Chinese sheep belonging to two non-seasonal reproduction breeds and two seasonal reproduction breeds. One mutation at exon 3 (NM_001009461:c.486A &amp;gt; G) was &amp;#64257;rstly described at the sheep AA-NAT locus. Hence, we described the SmaI PCR-RFLP method for detecting EX3 486A &amp;gt; G mutation, frequencies of the AA-NAT-G allele varied from 0.871 to 0.908 in two non-seasonal reproduction breeds and 0.517 to 0.578 in two seasonal reproduction breeds. The associations of SmaI polymorphism with estrus...
Tipo: Journal article
Palavras-chave: AA-NAT gene; Polymorphism; Reproduction; Seasonality; Sheep.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200007

Association between biometric characteristics of tomato seeds and seedling growth and development
Provedor de dados: 69
Autores: Peñaloza,Patricia; Durán,José María.
Background The size and weight of tomato seeds depend on genetics and can be modified by environment and management. In some species, a strong relation has been described between physical aspects of the seeds and the quality of the corresponding seedlings, but this cannot be considered a general rule. The objective of this research was to identify any association between the biometric characteristics of tomato seeds and the growth and development of their seedlings. Results A total of 18 lots of hybrid tomato seeds were used (from indeterminate plants with round fruits), belonging to six varieties from two reproduction seasons. Each lot was evaluated for seed size and weight, and seed quality, in terms of the germination test (5 and 14 d after sowing). The...
Tipo: Journal article
Palavras-chave: Seed size; Seed weight; Seedling emergence; Seedling length; Seedlings dry weight; Solanum lycopersicum L.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400002

Association between polymorphism of the G-protein &amp;#946;3 subunit C825T and essential hypertension: an updated meta-analysis involving 36,802 subjects
Provedor de dados: 48
Autores: Zheng,Huan; Xu,Huifeng; Cui,Bin; Xie,Nanzi; Wang,Zhi; Luo,Ming.
Purpose: The G-protein &amp;#946;3-subunit gene C825T polymorphism (GNB3-C825T) has been reported to be associated with essential hypertension (EH), but results from previous studies are conflicting. The present study aimed at investigating the association between this polymorphism and risk of EH using a meta-analysis on the published studies. Materials and Methods: PubMed, Embase, CBM (China Biological Medicine Database), Wanfang and VIP databases were searched to identify eligible studies published in English and Chinese before March 2013. Data were extracted using standardized methods. The association was assessed by the odds ratio (OR) with 95% confidence intervals (CI). Begg's test was used to measure publication bias. Results: A total of 40...
Tipo: Journal article
Palavras-chave: GTP-Binding Proteins; Polymorphism; Genetic hypertension; Meta-Analysis.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000300007

Association Between Tongue Rolling and Tongue Folding in Osogbo, Southwestern Nigeria
Provedor de dados: 77
Autores: Igbeneghu,Christopher; Olukanni,Folake; Olisekodiaka,Japhet; Adesina,Adekunle.
This study was carried out among 144 individuals (18 years) from the Yoruba tribe of Southwestern Nigeria in order to determine the association between tongue rolling and folding. Participants were examined for the ability to roll and/or fold their tongues. The incidence of tongue rollers and folders were 59.7 % and 79.2 % respectively. Tongue rolling was higher in females than male but the difference was not significant (X2= 1.039, df = 1, p= 0.308). Tongue folding was significantly higher in females than males (X2= 4.211, df= 1, p= 0.04). Of the 144 participants, 76 (52.8 %) were tongue rollers and folders, 10 (6.9 %) were rollers and non-folders, 38 (26.4 %) were non-rollers and folders and 20 (13.9 %) were non-rollers and non-folders. These classes did...
Tipo: Journal article
Palavras-chave: Association; Traits; Tongue roller; Tongue folders; Osogbo; Nigeria.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300008

Association of nicotinic acetylcholine receptors with central respiratory control in isolated brainstem-spinal cord preparation of neonatal rats
Provedor de dados: 48
Autores: HATORI,EIKI; SAKURABA,SHIGEKI; KASHIWAGI,MASANORI; KURIBAYASHI,JUNYA; TSUJITA,MIKI; HOSOKAWA,YUKI; TAKEDA,JUNZO; KUWANA,SHUN-ICHI.
Nicotine exposure is a risk factor in several breathing disorders Nicotinic acetylcholine receptors (nAChRs) exist in the ventrolateral medulla, an important site for respiratory control. We examined the effects of nicotinic acetylcholine neurotransmission on central respiratory control by addition of a nAChR agonist or one of various antagonists into superfusion medium in the isolated brainstem-spinal cord from neonatal rats. Ventral C4 neuronal activity was monitored as central respiratory output, and activities of respiratory neurons in the ventrolateral medulla were recorded in whole-cell configuration. RJR-2403 (0.1-10mM), alpha4beta2 nAChR agonist induced dose-dependent increases in respiratory frequency. Non-selective nAChR antagonist mecamylamine...
Tipo: Journal article
Palavras-chave: Brainstem-spinal cord; Neonatal rat; Inspiratory neuron; Preinspiratory neuron; Nicotinic acetylcholine receptor.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200014

Association of serum total bilirubin levels with diastolic dysfunction in heart failure with preserved ejection fraction
Provedor de dados: 48
Autores: Zheng,Huan; Li,Ye; Xie,Nanzi.
BACKGROUND: Left ventricular diastolic dysfunction is one of the main characteristics of heart failure patients with a preserved left ventricular ejection fraction. As bilirubin is regarded as an important endogenous antioxidant molecule, serum total bilirubin levels were compared between heart failure patients with a preserved left ventricular ejection fraction and normal controls in this study. We recruited 327 heart failure patients with a preserved left ventricular ejection fraction and 200 healthy controls. Patients were divided into 4 subgroups by their comprehensive echocardiographic manifestations, 1-mild, 2-moderate, 3-severe (reversible restrictive), 4-severe (fixed restrictive). Total bilirubin levels were compared using stepwise multiple...
Tipo: Journal article
Palavras-chave: Bilirubin; Heart failure; Diastolic dysfunction; Echocardiography.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100007

Association of the infusion of Heteropterys aphrodisiaca and endurance training brings spermatogenetic advantages
Provedor de dados: 48
Autores: Gomes,Marcos L M; Monteiro,Juliana C; Freitas,Karine M; Sbervelheri,Mariana M; Dolder,Heidi.
The species Heteropterys aphrodisiaca is commonly used as a stimulant by popular medicine in the Cerrado, a savanna-like biome, Brazil. Recent studies have proved its protective effects on testes of animals submitted to treatment using Cyclosporine A, as well as its stimulus effect in increasing testosterone secretion. Therefore, the present study was designed to analyze whether the association of the plant infusion and endurance exercise could potentiate the stimulating effect. The animals were separated into 4 groups: two control (sedentary and trained) receiving water and two treated (sedentary and trained) receiving the plant infusion daily (104mg/day). The proportion of the seminiferous tubule compartment and interstitium was analyzed. Within the...
Tipo: Journal article
Palavras-chave: Germ cells; Phytotherapy; Seminiferous epithelium; Spermatogenesis; Testosterone.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000300004

Association of TNF promoter polymorphisms with type 1 diabetes in the South Croatian population
Provedor de dados: 48
Autores: BORASKA,VESNA; ŠKRABI,VESELIN; IKEŠ ULI,VEDRANA; BEI,KRISTIJAN; KAPITANOVI,SANJA; ZEMUNIK,TATIJANA.
Type 1 diabetes mellitus (TIDM) is an autoimmune disease characterized by the destruction of pancreatic p cells. Tumor necrosis factor (TNF) is a pleotropic cytokine with potent immunomodulatory and inflammatory activity. Association studies of TNF polymorphisms and type 1 diabetes (TIDM) frequently demonstrated TNF involvement with TIDM. Although TNF may play an important role in the pathogenesis of TIDM, the genetic association of TNF región with the disease has not been conclusive because of the strong linkage disequilibrium with HLA genes. In this study, we examined two TNF promoter variants (rs 1800629 at position -308, and rs361525 at position -238) for TIDM association in 233 patients and 144 controls from the population of South Croatia. A higher...
Tipo: Journal article
Palavras-chave: Type 1 diabetes; Tumor necrosis factor gene (TNF); Polymorphism; Genetic epidemiology; Croatia.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000200005

Asterosiphon dichotomus (Kützing) Rieth (Vaucheriales, Ochrophyta, Xanthophyceae) in sub-arid agricultural soils of Catalonia (Spain)
Provedor de dados: 73
Autores: Cambra-Sánchez,Jaume.
En una campaña de muestreo en la provincia Lleida (Cataluña, España), se han recolectado diversas algas edáfcas en campos agrícolas. En una de las localidades estudiadas se encontró Asterosiphon dichotomus (Kützing) Rieth (Vaucheriales, Ochrophyta, Xanthophyceae), y es la primera vez que se observa este taxón para la fora algológica ibérica. Las algas crecían sobre suelos húmedos, en plantaciones de almendros. Se describe su morfología y su crecimiento en cultivos, y se analiza su distribución geográfca en Europa.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100015

Astro-INIA: Primera Variedad de Poroto Granado Tipo Coscorrón de Hábito de Crecimiento Determinado Arbustivo
Provedor de dados: 113
Autores: Tay,Juan; France,Andrés; Pedreros,Alberto.
Astro-INIA es la primera variedad de poroto (Phaseolus vulgaris L.) tipo coscorrón liberada en Chile, con hábito de crecimiento arbustivo y para producción de poroto granado. Su origen fue por selección desde una planta de hábito de crecimiento determinado arbustivo, Tipo 1, dentro de una siembra de producción de semilla de la variedad coscorrón Granado-INIA, esta última de hábito de crecimiento guiador. Además de su buen tipo de planta, Astro-INIA se destaca por su precocidad y excelente calidad culinaria, similar a las variedades y tipos coscorrones utilizados en el país para la producción de poroto granado.
Tipo: Journal article
Palavras-chave: Poroto granado; Hábito de crecimiento determinado arbustivo.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000400011

Asymbiotic germination in three Chloraea species (Orchidaceae) from Chile
Provedor de dados: 73
Autores: PEREIRA,GUILLERMO; ALBORNOZ,VERÓNICA; ROMERO,CHRISTIAN; LARA,SEBASTIÁN; SÁNCHEZ-OLATE,MANUEL; RÍOS,DARCY; ATALA,CRISTIAN.
ABSTRACT Orchids require symbiotic fungi and/or specific conditions to germinate. Asymbiotic techniques have been shown successful for orchid germination. In Chile, Chloraea include many endemic, and potentially ornamental, terrestrial orchid species. In this study, individuals of Chloraea crispa, C. gavilu and C. virescens were manually autopollinated. The resulting capsules were sterilized and seeds were aseptically obtained. We evaluated asymbiotic germination in: Agar Water (AW), Knudson C (KC), Banana Culture Media (CMB), Tomato Culture Media (CMT), Malmgren Modified (MM), Murashige and Skoog (MS), and MS modified (MS1/2). Seeds were incubated in the dark at 24±1 ºC for 2 weeks. Then they were put in 16/8 h light/dark cycles for 14 weeks. We...
Tipo: Journal article
Palavras-chave: Terrestrial orchids; Endemic species; In vitro germination; Culture media; Orchid propagation; Asymbiotic germination.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100131

Asymmetries of the Left and Right Temporal Lobes
Provedor de dados: 77
Autores: Boni,R. C; Prosdócimi,F. C; Bonsi,A. B.; Almeida,T. M.; Ribeiro,L. A. M.
Anatomical brain asymmetries are subtle and still little studied in humans. Among all the animals, humans have the most asymmetric brains Crow (2004). The language faculty and handedness are localized on the left side. The objective this paper is to verify whether the temporal lobes are anatomically different. Our sample was composed of 40 post mortem adult brains of both sexes, which were investigated at the Human Anatomy Laboratory of the Nove de Julho University Center in Sao Paulo, Brazil. The brains were fixed in a solution of 5% paraformaldehyde. Three different measurements were taken using a pachimeter (Mitutoyo) and a goniometer (Card) on both hemispheres: Ml - the length of the lateral sulcus; M2 - the distance from the lateral sulcus to the...
Tipo: Journal article
Palavras-chave: Brain; Asymmetry; Temporal Lobe.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100016

Asymmetry, Handedness and Auricle Morphometry
Provedor de dados: 77
Autores: Tatlisumak,Ertugrul; Yavuz,Mehmet Sunay; Kutlu,Necip; Asirdizer,Mahmut; Yoleri,Levent; Aslan,Asim.
The aims of this study were to determine various morphometric measurements of auricle, to investigate asymmetry and its relation with handedness in both sexes. Main morphometric measurements of both auricles and hand preferences were determined on 200 male and 200 female healthy university students. All measurements of the auricles were larger in males than the corresponding ones in females and all the differences except earlobe widths were statistically significant. All measurements of left and right auricles were statistically significantly different in both sexes except earlobe length in males, and distance from the highest point of the auricle to the bottom of the intertragic notch and earlobe length in females. Auricle length and distance from the...
Tipo: Journal article
Palavras-chave: Asymmetry; Handedness; Auricle Morphometry; Lateralization; Anthropometry.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400057

Asymmetry of Human Skull Base During Growth
Provedor de dados: 77
Autores: Russo,Priscilla Perez; Smith,Ricardo Luiz.
Knowledge about human skull asymmetry in normal dry specimens is useful as a parameter for medical and dentistry practice. Skull base was investigated with the objective to validate the method of indirect measurement with digital pictures and to evaluate the degree of asymmetry from human skull base in different ages. We analyzed 176 normal identified human skulls, divided by age in the following groups: Fetuses, newborn, children and adults. Measures were taken from a central point: pharyngeal tubercle and 4 lateral points: foramen ovale, foramen spinosum, carotid canal and stylomastoid foramen using digital biometry after a comparative validation with directed method performed with caliper. Results were presented as asymmetry indexes and data were...
Tipo: Journal article
Palavras-chave: Anatomy; Asymmetry; Growth; Skull.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300062

ATLAS OF THE SEA SURFACE TEMPERATURE OVER THE ATLANTIC INTERTROPICAL BASIN USING DATA FROM THE NOAA-14 SATELLITE (1995­2001)
Provedor de dados: 72
Autores: Ferreira,Antonio Geraldo; Travassos,Paulo.
The objective of this paper is to present the "Atlas of the Sea Surface Temperature over the Atlantic Intertropical Basin by Using Data from the NOAA-14 Satellite (1995­2001)". In the Atlas, detailed information about the procedures utilized to retrieve SST from NOAA-14/AVHRR, over the Atlantic Ocean in the area encompassed by latitudes 10 N-20 S and longitudes 50 W-20 W, were compiled. Also included in the Atlas, is the complete set of monthly SST images and monthly historical average in the period between 1995 and 2001.Based on these images, short description of the SST patterns over the area mentioned before is made. The Atlas includes 2 CD's, one of which containing approximately 1250 images already processed, in jpg format, of the SST fields (daily,...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200040

ATMOSPHERIC CORRECTION OF THE LANDSAT SATELLITE IMAGERY FOR TURBID WATERS
Provedor de dados: 72
Autores: Hwan Ahn,Yu; Shanmugam,P; Hyung Ryu,Joo.
This paper describes methods for the correction of the atmospheric effects in the Landsat VIS/NIR imagery in relation to the retrieval of meaningful information about the ocean color, especially from Case-2 waters around Korean peninsula. Three atmospheric correction (AC) methods implemented and examined, using the TOA radiance or reflectance data, are 6S radiative transfer model, spectral shape matching (SSMM) and path-extraction methods. The results show that overall shape and magnitude of radiance or reflectance spectra of the atmospherically corrected Landsat VIS/NIR imagery by SSMM appears to have very good agreement with the in-situ spectra collected for clear and turbid waters, while path-extraction over turbid waters though often reproduces in-situ...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200002

ATMOSPHERIC N DEPOSITION IN CENTRAL AND SOUTHERN CHILE: AN OVERVIEW
Provedor de dados: 73
Autores: Godoy,Roberto; Paulino,Leandro; Oyarzún,Carlos; Boeckx,Pascal.
Temperate forests in Chile are not yet affected by elevated nitrogen (N) deposition. However, anthropogenic activities such as transport, industry and agriculture have been increasing in central and southern Chile. These activities can substantially alter the atmospheric N load and subsequently N deposition. Nitrogen deposition data for central and southern Chile are scares and scattered. In order to assess trends of N deposition a good knowledge of past and current N depositions is however essential. This study presents an overview of the existing N deposition data in Chile. In central Chile, dry deposition has been estimated at 0.8 kg NO3--N ha-1 yr-1 and 1.0 kg NH4+-N ha-1 yr-1, giving a total of 1.8 kg N ha-1 yr-1 and wet deposition was 0.4 kg NO3--N...
Tipo: Journal article
Palavras-chave: Atmospheric deposition; Central and southern Chile; Mineral N; Organic N.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100008

ATMOSPHERIC PARAMETERS OVER THE MARGINAL ICE ZONE RETREIVAL FROM ANSR/AMSR-E DATA
Provedor de dados: 72
Autores: Mitnik,Maia L.; Mitnik,Leonid M.
A direct radiative transfer model, 478 radiosondes complimented by the cloud liquid water content profiles and the underlying surface temperatures and emissivities were used to simulate the brightness temperatures T Bs over the Marginal Ice Zone at ADEOS-II AMSR and Aqua AMSR-E frequencies. The precipitable water V varied from 0.63 to 18.5kg/m², the total cloud liquid water content Q&lt;=0.25kg/m² and SST£1°C. The mean experimental values of emissivity and its fluctuations for several types of the first-year ice at ice temperature of 263 to 271K were used in a model. The sea surface emissivity was computed taking into account wind action. 10 values of ice concentration C uniformly distributed from 0.0 to 1.0 were selected for each radiosonde. The...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300015

Atorvastatin Has no Effects on Kidney Tissues of Wistar Albino Rats in the Long-Term Intake: An Electron Microscopic Study
Provedor de dados: 77
Autores: Aktas,Ayfer; Serhan Tasdemir,M; Cudi Tuncer,M; Nergiz,Yusuf; Akkus,Murat; Bagriyanik,Hüsnü Alper.
In this study, we evaluated the ultrastructural findings of kidney with systemic administration of different doses of atorvastatin in a rat model. Statins may have anti-inflammatory effects that would play a role in preventing the cellular damage. The aim of this study was to investigate how atorvastatin could play a role in kidney tissues. Forty adult male Wistar albino rats (200­250 g) were randomly divided into 4 groups of ten rats each (A1, A2, A3 and Control). Three different doses of atorvastatin were used to determine the effects on kidney tissues during 90 day period. The kidneys of A1 (0.1-mg group), A2 (0.5-mg group) and A3 (1-mg group) group were excised and the tissues were examined after the 90 days by transmission electron microscopy. Despite...
Tipo: Journal article
Palavras-chave: Kidney; Wistar-albino rat; Statins; Atorvastatin; Ultrastructural.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100025

Atorvastatin-Medicated Dentifrice Significantly Inhibits CD4+ T Cell Proliferation: In vitro Pilot Study
Provedor de dados: 77
Autores: Rosenberg,David R; Kernitsky,Jeremy R; Andrade,Catherine X; Ramirez,Valeria; Violant,Deborah; Nart,José.
Reports indicate that statins (cholesterol-lowering drugs), in addition to lowering cholesterol, have an immunomodulatory effect. This effect may be beneficial for the treatment of several diseases, including periodontal disease. The aim of the present study was to evaluate the immunomodulatory effect of an atorvastatin-medicated dentifrice on CD4+ T cell proliferation. CD4+ T cell proliferation assays and peripheral blood mononuclear cell (PBMC) viability assays were conducted on PBMCs from healthy donors cultured under the following conditions: control, atorvastatin solution, atorvastatin-medicated dentifrice, and dentifrice without atorvastatin at concentrations of 1, 5, 10, 50 and 100 µM. A Generalized Equation Estimation (GEE) model was used to...
Tipo: Journal article
Palavras-chave: Atorvastatin calcium; Dentifrices; T cells; Flow cytometry.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200002

ATRAZINE EFFICIENCY IN AN ANDISOL AS AFFECTED BY CLAYS AND NANOCLAYS IN ETHYLCELLULOSE CONTROLLED RELEASE FORMULATIONS
Provedor de dados: 127
Autores: Cea,M; Cartes,P; Palma,G; Mora,M.L.
Atrazine, a herbicide used for the control of broadleaf weeds of different crops, was incorporated in ethylcellulose controlled release formulations (CRFs) by using the solvent evaporation technique. Allophanic clays and nanoclays were incorporated as matrix modifying agents. The formulations were characterized by scanning electron microscopy (SEM) and infrared spectroscopy (FTIR), and their behavior was determined in aqueous phase. Dissipation studies and soil columns experiments with CRFs were also carried out, and compared with commercial formulations (CFs). In addition, a short-term bioassay was performed to evaluate the effect of CRFs and CFs on the emergence and growth of field mustard (Brassica campestris L.) under greenhouse conditions. The matrix...
Tipo: Journal article
Palavras-chave: Atrazine; Natural clays and nanoclays; Controlled release; Soil; Herbicidal activity.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000100007

Atresia Folicular en Ovarios de Prochilodus lineatus
Provedor de dados: 77
Autores: Flores Quintana,C; Blanco Cohene,T; Arbués,R; Domitrovic,H; González,J.
Durante el período reproductivo, en el ovario de los teleósteos se forman cíclicamente folículos primarios, los que maduran y son liberados en el momento de la ovulación. Sin embargo, algunos de ellos desarrollan un proceso de atresia con degeneración y reabsorción, el que para ser considerado un evento fisiológico debería predominar al final del ciclo reproductivo. Las características morfológicas de ovarios de Prochilodus lineatus fueron analizadas para identificar la presencia de folículos atrésicos como indicadores de posibles modificaciones de su biología reproductiva que afecte la repoblación de la especie. En los ovarios de P. lineatus predominaron los cambios morfológicos que se corresponden con la denominada atresia tipo I, y los folículos...
Tipo: Journal article
Palavras-chave: Peces; Gónadas; Histología; Sábalo.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400008

Atresia of the Coronary Sinus Ostium to the Right Atrium with a Persistent Left Superior Vena Cava
Provedor de dados: 77
Autores: Caetano,Abadio Gonçalves; Ribeiro,Tiago Coelho; Filho,Omar Andrade Rodrigues; Fazan,Valéria Paula Sassoli.
The coronary sinus has lately assumed an important role in the cardiologic clinic once it has been widely used in invasive procedures of the heart. Commonly, it is used during the electrodes implants for the epimiocardic monitoring of the cardiac rhythm, through a biventricular pace maker. These invasive procedures are not possible in hearts with an atresic coronary sinus ostium. In the presence of this anomaly, another may occur: the development of the "Marchal" vein which is a remaining of the left superior vena cava (LSVC). This happens so that the venous blood from the heart can drain into the right atrium, by a communication between the LSVC and the left brachiocephalic vein. The presence of a LSVC brings difficulties when performing an invasive...
Tipo: Journal article
Palavras-chave: Coronary sinus; Ostial atresia; Persistent left superior vena cava; Congenital heart disease; Cardiac surgery.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300022

ATRIBUTOS Y ANTECEDENTES DEL COMPORTAMIENTO DE Biserrula pelecinus L. NUEVA LEGUMINOSA FORRAJERA ANUAL PARA CHILE MEDITERRÁNEO
Provedor de dados: 113
Autores: Ovalle M.,Carlos; Arredondo S.,Susana; del Pozo L.,Alejandro; Avendaño R.,Julia; Fernández E.,Fernando.
Biserrula pelecinus L. es en Chile una nueva especie leguminosa forrajera para suelos ácidos de texturas liviana a media, en zonas de secano mediterráneo subhúmedo y húmedo. Debido a su alta dureza seminal (99% al inicio de la segunda temporada de crecimiento), es una pradera anual, especialmente apropiada para sistemas agrícolas donde la pradera se encuentra en rotación con cereales (‘ley farming system’). Posee una fenología intermedia (132 a 136 días a floración), de hábito de crecimiento semi-erecto, flores de color azul, destacándose por poseer un tamaño de semilla pequeño (674 a 842 semillas g-1), y presenta alto índice de esfuerzo reproductivo (superior a 1,6). La producción de materia seca y de semillas es comparable, y en algunos años superior, a...
Tipo: Journal article
Palavras-chave: Leguminosa forrajera; Biserrula pelecinus; Clima Mediterráneo.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000100009

Atrophy of the Nitrergic Myenteric Neurons in the Descending Colon Rats Submitted to Protein and Vitamin Deficiency
Provedor de dados: 77
Autores: Araújo,Eduardo José de Almeida; Hermes,Catchia; Miranda Neto,Marcílio Hubner de; Almeida,Elton Carlos de; Sant'Ana,Débora de Mello Gonçales.
Effects of protein and B-complex vitamin deficiency were assessed with respect to the morphometry of myenteric neurons in the descending colon of adult rats. Sixteen animals were divided into two groups: Control Group (CG, n=8) and Experimental Group (EG, n=8). The CG received 22% protein chow and the EG received 4% protein chow for 120 days. The descending colon was submitted to NADH- and NADPH-diaphorase technique in order to evidence nervous cells in the whole mounts preparations. In the EG, NADH-d positive neurons presented reduced nuclei, while NADPH-d positive neurons showed atrophy of the soma area (~41.7%) inducing an increase of the proportion occupied by the nucleus inside in the soma of these cells.
Tipo: Journal article
Palavras-chave: Malnutrition; Large intestine; Enteric nervous system; Myenteric plexus; Neural plasticity.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300047

At-sea abundance and distribution of skuas and jaegers (Charadriiformes: Stercorariidae) at coastal waters off central Chile
Provedor de dados: 97
Autores: Simeone,Alejandro; Anguita,Cristóbal; Luna-Jorquera,Guillermo.
BACKGROUND: Skuas and jaegers (Charadriiformes: Stercorariidae) are seabirds breeding at moderate to high latitudes and some perform extensive post-breeding transequatorial migrations. Most species overwinter and perform significant portions of their migratory flyways along the Pacific coast of South America, but scant information is available on their at-sea ecology in this waters. Our aims in this study were to determine: 1) the timing of occurrence and fluctuations in abundance of skua and jaeger species, 2) their spatial distribution within the coastal zone and 3) at-sea behavior of birds, including flock size and interactions with other seabird species. RESULTS: Between July 2006 and October 2013, we conducted at-sea bird counts at Valparaiso Bay...
Tipo: Journal article
Palavras-chave: Skuas; Jaegers; Stercorariidae; Seabirds; Kleptoparasitism; At-sea distribution.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100006

Attempts at Applying Cloning to the Conservation of Species in Danger of Extinction
Provedor de dados: 77
Autores: Rojas,Mariana; Venegas,Felipe; Montiel,Enrique; Servely,Jean Luc; Vignon,Xavier; Guillomot,Michel.
The somatic cloning by transfer of the nuclei of differentiated adult cells to previously enucleated oocytes is a promising technique for the production of embryos of high genetic value. The better mastering of somatic cloning gives us the possibility to produce embryos from endangered species. The huemul is an Andean native deer, that has been declared an endangered species, it holds a great patrimonial value and it is a Chilean national emblem. In Chile the huemul has the status of protected animal on thirteen Parks and National Reserves managed by Corporacion Nacional Forestal (CONAF). This protection, however, is considered insufficient due to the few geographical connections between the different protected areas. Furthermore, a great proportion of...
Tipo: Journal article
Palavras-chave: Huemul; Interspecific cloning; Endangered species.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000400008

Attitudes towards genomic: Research in four Latin American countries
Provedor de dados: 69
Autores: Rodríguez Yunta,Eduardo; Valdebenito Herrera,Carolina; Misseroni,Adelio; Fernández Milla,Lautaro; Outomuro,Delia; Schiattino Lemus,Irene; Ferrer Lues,Marcela; Lolas Stepke,Fernando.
The present reflection refers to data obtained about the social representations of genomic research and its applications through interviews with legislators and lawyers, biomedical researchers and civilians and the review of scientific and legal literature in four Latin American countries: Argentine, Chile, Mexico and Peru. Several issues are addressed: little access to prevention and therapeutic methods, lack of equity in health benefits, commercialization of gene sequences through patents which leads to commercial exploitation of underdeveloped countries, the possibility of physical or psychological damage or genetic discrimination, the possibility of genetic modifications or abortion for eugenic reasons, the necessity of safeguarding confidentiality,...
Tipo: Journal article
Palavras-chave: Cloning; Genome; Social representations; Transgenic.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300003

Attitudinal determinants of willingness-to-pay for river ecosystem improvements in central Chile: A choice experiment
Provedor de dados: 118
Autores: Huenchuleo,Carlos A; Barkmann,Jan; Marggraf,Rainer.
A respondent&amp;#8217;s preference for non-market goods depends not only on the attributes of the goods but also on the respondent&amp;#8217;s attitude towards the goods being valued. Accounting for these characteristics may substantially improve the ability of stated choice models to represent preference heterogeneity. In this regard, we analyzed the influence of respondent attitudes on the valuation of river ecosystem quality attributes affected by pulp mill wastewater in two central Chilean watersheds. We applied the Choice Experiment (CE) method to assess preferences on river pollution risk, water quality effects, threatened species and the yield in local fisheries. The payment vehicle was an additional annual charge to the electricity bill. All three...
Tipo: Journal article
Palavras-chave: Attitudes; Choice modeling; Economic valuation; Water resource.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000100011

Aumento de la Temperatura de Incubación en Huevos de Gallina Araucana (Gallus inauris): Efecto sobre la Mortalidad Embrionaria, Tasa de Eclosión, Peso del Polluelo, Saco Vitelino y de Órganos Internos
Provedor de dados: 77
Autores: Ruiz Diaz,Nancy; Orrego,Guillermo; Reyes,Miguel; Silva,Mauricio.
Se evaluó el efecto del incremento de la temperatura de incubación en huevos de gallina Araucana sobre la tasa de eclosión, la mortalidad embrionaria, el peso del polluelo, del saco vitelino y de los órganos internos. Los huevos (n= 426) fueron distribuidos al azar en: a) grupo Control (n=215), incubados a 37,5 °C por 21 días y b) grupo Experimental (n= 211), incubados a 39,5 °C, por 18 días, disminuyéndose a 37,5 °C los 3 días restantes. En ambos grupos la incubación se realizó con una humedad relativa constante del 55 %. La tasa de mortalidad embrionaria total fue significativamente menor (P 0,05) para el grupo Control (14,9 vs 44,1 %) y consecuentemente la tasa de eclosión fue significativamente mayor (P 0,05) en este mismo grupo (97,8 vs. 80,5 %). El...
Tipo: Journal article
Palavras-chave: Gallina Araucana; Incubación; Mortalidad embrionaria; Eclosión; Peso polluelo.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100009

Ausencia Congénita de la Vena Porta Hepática Asociada a Malrotación Intestinal y a Vena Cava Inferior Izquierda: Reporte de Caso
Provedor de dados: 77
Autores: Inzunza,Oscar; García,Cristian J; Zúñiga,Sergio; Inzunza,Martín; Schneeberger,Daniela; Salgado,Guillermo; Farfán,Emilio.
La ausencia congénita de la vena porta hepática es una malformación en extremo rara, fue descrita por primera vez en 1793 por John Abernethy y a la fecha se han reportado sólo 101 casos. Afecta con mayor frecuencia a mujeres y determina que el drenaje venoso intestinal sea derivado hacia el territorio de las venas sistémicas. Es también conocida como derivación porto-sistémica extra hepática congénita (CEPS), por su sigla en inglés, y se asocia a otras alteraciones congénitas,incluyendo anomalías cardíacas, de las vías biliares, enfermedades metabólicas y retardo mental. En este trabajo presentamos el hallazgo de esta malformación en el cadáver de un niño de dos años de edad, donde la vena porta seguía un trayecto anómalo y se unía a la vena renal derecha....
Tipo: Journal article
Palavras-chave: Ausencia de vena porta hepática; Anastomosis porto-cava; Mal rotación intestinal; Vena cava inferior izquierda.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200039

AUTHENTICATION OF COMMERCIAL CHILEAN MOLLUSKS USING RIBOSOMAL INTERNAL TRANSCRIBED SPACER (ITS) AS SPECIE-SPECIFIC DNA MARKER
Provedor de dados: 72
Autores: Aguilera-Muñoz,Felipe; Valenzuela-Muñoz,Valentina; Gallardo-Escárate,Cristian.
Contemporary world food safety standards have emphasized the implementation of efficient food traceability systems, including the correct labeling of products for the authentication of the commercialized species. In this context, Chile has reached an important development in agricultural exportations, reaching near US$ 3.82 billion in 2007. Since the identification based on morphologic and organoleptic characteristics is complex during the elaboration process of aquaculture products, molecular tools need to be developed in order to genetically trace aquaculture products. This study analyzed five species of Chilean commercial mo Husks using molecular DNA markers. From the partial sequences of the ribosomal region ITSl-5.8SrDNA-ITS2, the specific primers for...
Tipo: Journal article
Palavras-chave: Genetic traceability; ITS 1; ITS2; Mo Husk identification; Specific divider design.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200007

Availability of Nitrogen, Phosphorus and Potassium from Poultry Litter and Conventional Fertilizers in a Volcanic Soil Cultivated with Silage Corn
Provedor de dados: 117
Autores: Hirzel,Juan; Walter,Ingrid.
Poultry litter (PL) is an organic matter source used as soil amendment. Besides its important nutrient content, it is a cheap alternative to conventional fertilizers in crop production. The efficient use of PL also helps reduce the environmental problems normally associated with its disposal near poultry production farms. This article reports the relative effects of PL and conventional fertilizers on the availability of soil N, P and K, dry matter (DM) production and total nutrient content in silage corn (Zea mays L.). The field experiment was carried out in a soil derived from volcanic ash (Tipic Melanoxerands) of Central South Chile. Corn was grown for three seasons (2002-2005) and PL and conventional fertilizers were applied in the first two years. The...
Tipo: Journal article
Palavras-chave: Poultry litter; Soil fertility; Corn; Nitrogen; Phosphorus; Potassium.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300006

Available phosphorus in starter diets for meat-type quail
Provedor de dados: 118
Autores: Oliveira,Renata Gomes de; Freitas Pinheiro,Sandra R; Goulart,Karen B; Pires,Aldrin V; Figueiredo,Frederico de C; Torres-Cordido,Karoll A. Alfonso.
Phosphorus is an important mineral for optimum growth and bone mineralization and is considered the third most expensive nutrient in diets for nonruminants. An experiment was conducted to evaluate the available phosphorus requirements (AP) for meat-type quail in the starter phase (1 to 21 days old). One-day-old, unsexed European quail (375) from the LF1 lineage were used for the study and were housed in pens. The experiment had a completely randomized design, with five treatments (0.13, 0.23, 0.33, 0.43 and 0.53% of AP), each of which included five replicates in 15 birds. Feed intake, weight gain, feed conversion ratio, and the tibial deposition of phosphorus, calcium, and ash were assessed. The AP levels influenced all studied variables. We calculated...
Tipo: Journal article
Palavras-chave: Calcium; Bone growth; Calcium; Phosphorus ratio; Quail; Calcio; Codornices; Crecimiento óseo; Relación calcio; Fósforo.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000100002

Avances en Inmunidad Gestacional
Provedor de dados: 77
Autores: Arias,M. E; Villegas,J.
El inicio y establecimiento de la gestación en los mamíferos dependen de la adaptación del sistema inmunológico de la madre para tolerar un feto semi-alogénico. La gestación en sí misma constituye un acontecimiento de equilibrio inmunológico, ya que mientras el sistema inmune mantiene la competencia para la defensa contra antígenos foráneos, mecanismos de tolerancia local y periférica previenen una respuesta inapropiada contra alo-antígenos fetales de origen paterno lo que pudiera provocar el rechazo del feto. La interacción materno-fetal es extremadamente compleja y es difícil determinar todos los componentes del sistema inmune involucrados. Hasta ahora se ha demostrado la participación activa de las células T y sus productos, las citoquinas y también se...
Tipo: Journal article
Palavras-chave: Embarazo/preñez; Tolerancia inmunológica; Inmunología de la reproducción.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300009

Avances metodológicos para el estudio conjunto de la información genética, genealógica y geográfica en análisis evolutivos y de distribución
Provedor de dados: 97
Autores: VÁZQUEZ-DOMÍNGUEZ,ELLA; CASTAÑEDA-RICO,SUSETTE; GARRIDO-GARDUÑO,TANIA; GUTIÉRREZ-GARCÍA,TANIA A.
El análisis de la distribución de linajes de genes a lo largo de su distribución geográfica, para elucidar patrones y procesos históricos, evolutivos y ecológicos que determinan la distribución de la biota en el planeta, conforma la disciplina de estudio conocida como filogeografía. En esta revisión presentamos un resumen de la historia, definición y progresos de la filogeografía, profundizando sobre las herramientas, métodos y técnicas utilizadas para desarrollar estudios filogeográficos. Sintetizamos los fundamentos y avances analíticos y teóricos, con explicaciones mediante ejemplos relevantes que permitirán a los lectores obtener el sentido y alcances de esta área de investigación. Finalmente, indicamos las nuevas líneas de análisis y estudio de la...
Tipo: Journal article
Palavras-chave: ADN; Coalescencia; Estadísticos de resumen; Filogeografía; Genealogías de genes.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000200009

Aves asociadas al Aeropuerto Carriel Sur de Talcahuano, sur de Chile: evaluación de peligro aviario
Provedor de dados: 72
Autores: BARRIENTOS,CARLOS; GONZÁLEZ-ACUÑA,DANIEL; MORENO,LUCILA; ARDILES,KAREN; FIGUEROA R.,RICARDO A.
Entre el verano de 2002 y 2005 se evaluó la riqueza y abundancia de aves asociadas al Aeropuerto Carriel Sur de Talcahuano y se estimó el riesgo de colisión que representaría cada especie para la aeronavegación. Las aves fueron contabilizadas en 10 puntos de conteos distribuidos en distintos hábitats alrededor del las pistas de aterrizaje. El riesgo de colisión fue estimado mediante el índice de peligro aviario (IPA) el cual combina tamaño, abundancia e historial de colisiones de cada especie. Durante el periodo de estudio se registraron 63 especies, mas 10 especies que fueron registradas después del verano de 2005. Las especies más abundantes fueron el chirigüe, la gaviota dominicana, el queltehue y la loica (28%, 14%, 10%, 8% del total de registros...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100005

Aves en ambientes marinos y salinos: viviendo en hábitats secos
Provedor de dados: 97
Autores: SABAT,PABLO.
Para las aves, ambientes salobres como los marinos y los salares, son en la práctica hábitats secos. Cuando las aves beben agua o consumen presas saladas, sus fluidos corporales aumentan la osmolaridad. Para mantener el equilibrio osmótico, las aves tienen que eliminar el exceso de electrolitos ingerido en los alimentos y el agua. Las estrategias adaptativas utilizadas por las aves marinas incluyen la utilización de la glándula de la sal, la cual produce soluciones de excreción más concentradas que el agua de mar. Tanto la fisiología y la plasticidad de la glándula nasal se correlaciona con las características ecológicas de las especies. Además, las aves pueden minimizar el estrés osmótico escogiendo presas hipo-osmóticas, o con menor contenido de agua,...
Tipo: Journal article
Palavras-chave: Glándula de la sal; Función renal; Selección de dieta; Osmoregulacion; Paseriformes.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300004

Avian influenza: Eco-epidemiological aspects of the virus in its natural hosts, the migratory waterfowls
Provedor de dados: 97
Autores: MONTALVO-CORRAL,MARICELA; REYES-LEYVA,JULIO; HERNÁNDEZ,JESÚS.
Avian influenza viruses produce mainly respiratory and intestinal diseases. Their relevance in the generation of pandemic strains has led to a large amount of research to understand their distribution in nature, as well as the relations that become established for the effective transmission among different hosts. Waterfowl have been recognized as their natural reservoir and they play an important role in the propagation and generation of the diversity of these viruses. The emergence of new influenza viruses with pandemic potential among the human population (H5N1 of avian origin or recombinant H1N1 with avian segments) point our lack of information on many aspects of the ecology and epidemiology of these viruses in their natural hosts to enable the...
Tipo: Journal article
Palavras-chave: Avian influenza; Ecology; Epidemiology; Migratory birds.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000400008

Avian Paramyxoviruses: Detection by Transmission Electron Microscopy Techniques
Provedor de dados: 77
Autores: Catroxo,M. H. B; Martins,A. M. C. P. F; Petrella,S; Milanelo,L; Aschar,M; Souza,F; Nastari,B.D.B; Souza,R.B.
Diseases caused by avian paramyxovirus (APMV) occur in commercial, captive and wild birds worldwide, demonstrating the significant economic and ecological importance of these agents. Paramyxoviruses belong to the Paramyxoviridae family, Paramyxovirinae subfamily and Avulavirus genus. During the period 2000 to 2011, stool and small intestine samples of 1647 birds species were sent to the Laboratory of Electron Microscopy, Biological Institute of São Paulo, Brazil, for diagnosis of viral agents. The samples were processed by negative staining (rapid preparation) and resin embedding techniques. Under the transmission electron microscope by negative staining technique, in 294 (17.8%) samples of 1647 were visualized paramyxovirus particles pleomorphic, roughly...
Tipo: Journal article
Palavras-chave: Paramyxoviruses; Avian; Transmission Electron Microscopy.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200062

Avian physiological ecology: old questions,  new systems and new approaches
Provedor de dados: 97
Autores: BOZINOVIC,FRANCISCO; MARTINEZ DEL RIO,CARLOS.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300002

Awareness and current knowledge of breast cancer
Provedor de dados: 48
Autores: Akram,Muhammad; Iqbal,Mehwish; Daniyal,Muhammad; Khan,Asmat Ullah.
Abstract Breast cancer remains a worldwide public health dilemma and is currently the most common tumour in the globe. Awareness of breast cancer, public attentiveness, and advancement in breast imaging has made a positive impact on recognition and screening of breast cancer. Breast cancer is life-threatening disease in females and the leading cause of mortality among women population. For the previous two decades, studies related to the breast cancer has guided to astonishing advancement in our understanding of the breast cancer, resulting in further proficient treatments. Amongst all the malignant diseases, breast cancer is considered as one of the leading cause of death in post menopausal women accounting for 23% of all cancer deaths. It is a global...
Tipo: Journal article
Palavras-chave: Breast cancer; Chemotherapy; Gene therapy; Stem cell therapy.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100504

Azufre Elemental como Corrector del pH y la Fertilidad de Alfunos Suelos de la III y IV Región de Chile
Provedor de dados: 113
Autores: Sierra B,Carlos; Lancelloti M,Angelus; Vidal P,Iván.
En los suelos de la zona norte de Chile existen suelos con carbonatos, situación que influye sobre la disponibilidad de nutrientes para los cultivos. En el presente experimento se evaluó en condiciones de laboratorio, el efecto de la aplicación de azufre elemental sobre el pH, conductividad eléctrica y micronutrientes en seis suelos de la III y IV Región, Chile. El azufre se aplicó en dosis de 500 y 1000 mg S° kg-1, y el suelo se incubó por períodos de 60 y 120 días a 80% de su capacidad de campo a 25°C. El experimento se estableció con un diseño de tratamientos completamente al azar con arreglo factorial, donde los factores fueron: suelo, dosis de azufre elemental y tiempo de incubación. Los recipientes en incubación se distribuyeron de acuerdo a un...
Tipo: Journal article
Palavras-chave: Suelos alcalinos; PH; Conductividad eléctrica; Micronutrientes.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000200007

Back to the Debate: Sternalis Muscle
Provedor de dados: 77
Autores: Hung,Laurie Y; Lucaciu,Octavian C; Wong,Jessica J.
The sternalis muscle (SM) is an anatomical variant found in the anterior thoracic wall. While the attachment sites of SM are generally agreed upon, the innervation and function of this muscle are not well established. Cadaveric and surgical explorations to date report that SM is innervated by either the pectoral nerves or the anterior branches of the intercostal nerves, or a combination of both. Knowledge of SM is relevant to health care providers specialising in imaging and/or surgery of the anterior thoracic wall. This paper aims to raise awareness in the medical community of the clinical relevance of SM through two case reports and a brief literature review.
Tipo: Journal article
Palavras-chave: Pectoralis muscles; Rachischisis; Pectoral nerves; Intercostal nerves.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100058

BACTERIAL DEGRADATION AND BIOREMEDIATION OF CHLORINATED HERBICIDES AND BIPHENYLS
Provedor de dados: 126
Autores: Seeger,Michael; Hernández,Marcela; Méndez,Valentina; Ponce,Bernardita; Córdova,Macarena; González,Myriam.
Chlorinated herbicides (e.g. s-triazines) and polychlorobiphenyls (PCBs) are persistent organic pollutants (POPs) that are widely distributed in the environment. s-Triazine herbicides are used in agriculture and forestry in diverse regions of the world. PCBs were produced worldwide for industrial applications, and an important amount of these compounds have been released into the environment. PCBs and s-triazines are toxic compounds that could act as endocrine disrupters and cause cancer. Therefore, environmental pollution with s-triazines and PCBs is of increasing concern. Bioremediation is an attractive technology for the decontamination of polluted sites. Microorganisms play a main role in the removal of POPs from the environment. Diverse bacteria able...
Tipo: Journal article
Palavras-chave: Bacterial degradation; I-triazines; PCBs; Catabolic genes; Genome; Bioremediation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100007

Bacterial diversity in the sediments of a temperate artificial lake, Rapel reservoir
Provedor de dados: 97
Autores: DORADOR,CRISTINA; CASTILLO,GABRIELA; WITZEL,K. P.; VILA,IRMA.
Rapel reservoir is an eutrophic system in Chile that has undergone a series of anthropogenic impacts in recent decades. To provide a better understanding of the processes occurring in the reservoir, we examined bacterial composition from surface sediments using traditional microbiology techniques and molecular biology tools. Our results showed significant temporal variation in the physical and chemical composition of the water column, but no depth-related differences during the study period. To detect temporal changes in bacterial composition, cultivable heterotrophic bacteria, heterotrophic iron oxidizing bacteria, and sulfate-reducing bacteria were extracted from the surface sediments and their concentration measured. Microbial diversity in sediments was...
Tipo: Journal article
Palavras-chave: Sediments; Sulfate-reducing bacteria; 16S rDNA.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200007

Bacteriophage prophylaxis against Salmonella enteritidis and Salmonella pullorum using Caenorhabditis elegans as an assay system
Provedor de dados: 69
Autores: Santander,Javier; Robeson,James.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200012

BANCO DE SEMILLAS, REGENERACION Y CRECIMIENTO DE TELINE MONSPESSULANA (L.) K. KOCH DESPUES DE UN INCENDIO FORESTAL
Provedor de dados: 73
Autores: García,Rafael A; Pauchard,Aníbal; Peña,Eduardo.
Las especies de plantas invasoras y el fuego pueden generar retroalimentación positiva, modificando la dinámica del paisaje y los ciclos ecosistémicos. Este trabajo tiene por objetivo estudiar los patrones poblacionales de Teline monspessulana después de un incendio forestal en la zona costera de la Región del Bío-Bío, Chile, dominada por plantaciones forestales de Pinus radiata y Eucalyptus globulus. El estudio se realizó en un sector del Cerro Caracol, adyacente a la ciudad de Concepción, que fue afectado por un incendio en febrero de 2005. El área de estudio fue estratificada en tres sitios, los que representan diferencias en cobertura y pendiente. En cada sitio se establecieron quince parcelas de un metro cuadrado. El banco de semillas de T....
Tipo: Journal article
Palavras-chave: Retamilla; Especies exóticas; Invasiones biológicas; Feedbacks positivos de fuego; Genista.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200005

Banks of microscopic forms and survival to darkness of propagules and microscopic stages of macroalgae
Provedor de dados: 97
Autores: SANTELICES,BERNABÉ; AEDO,DIEGO; HOFFMANN,ALICIA.
Previous studies have found that the number of species conforming a bank of microscopic forms in tide pools in central Chile accounted only for half the number of species present in the macroscopic vegetation around the pools. An elemental condition for survival in these banks is the ability of microscopic forms to tolerate darkness or very low irradiances for extended periods. To test this ability, spores of 17 green, brown and red algal species, present and absent from the bank, were incubated at different combinations of irradiances and day lengths. Propagules of 47 % of the species tested (eight species) germinated in total darkness while the propagules of the other nine species germinated under conditions of very low irradiance (2-10 µmol m-2 s-1). In...
Tipo: Journal article
Palavras-chave: Benthic algae; Dark tolerance; Germination; Growth; Microscopic forms.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000300006

Barley Types and Varieties in Spain: Un panorama histórico
Provedor de dados: 118
Autores: Martínez-Moreno,Fernando; Igartua,Ernesto; Solís,Ignacio.
Barley is currently the most cultivated crop in Spain, with an acreage of about three million ha. Its importance stems from its adaptation to areas with poor soil conditions and water stress. The aim of this work is to describe the historical evolution of barley types and varieties of barley grown by farmers in Spain. A historical review was performed by consulting articles and books on the history, archaeology, and agronomy related to the issue. Different web sites and articles about the current varietal state of barley in Spain were also consulted. Another important information source was the CRF (Centro de Recursos Fitogenéticos, Spanish Center of Plant Genetic Resources) of Spain, where a large collection of landraces is preserved. The first barleys...
Tipo: Journal article
Palavras-chave: Barley; Landraces; Plant genetic resources; Varieties; Plant breeding; Cebada; Mejora vegetal; Recursos fitogenéticos; Variedades; Variedades locales.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100002

BASE DE DATOS ECO-HIDROLOGICA DE LOS RIOS DE CHILE: UNA HERRAMIENTA DE GESTION PARA LOS ECOSISTEMAS ACUATICOS
Provedor de dados: 72
Autores: Peredo-Parada,M; Martínez-Capel,F; Garófano-Gomez,V; Atenas,M; Riestra,F.
El conocimiento de las especies nativas de Chile se caracteriza por ser insuficiente, incompleto, fragmentado y poco actualizado, lo cual constituye una de las principales limitantes para desarrollar estrategias de conservación de especies o planes de conservación y recuperación de sistemas acuáticos. Lo anterior cobra mayor importancia dada la mayor presión que tienen actualmente estos ecosistemas en el país. Para paliar este vacío se ha confeccionado una Base de Datos Eco-Hidrológica de los ríos de Chile. Esta base de datos cuenta con información hidrológica, fisicoquímica de las aguas, sedimentológicas e información íctica. Esta última información se ha basado en recopilación bibliográfica de literatura referente a distribución de peces, dividida en...
Tipo: Journal article
Palavras-chave: Chile; REC-Chile; Base de datos eco-hidrológica; Gestión ecosistemas acuáticos; Peces nativos chilenos.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100015

Baseline levels of biomarkers of oxidative damage in Odontesthes nigricans (Pisces, Atherinopsidae) from two coastal areas of the Beagle Channel, Argentina
Provedor de dados: 97
Autores: LATTUCA,MARÍA E; PÉREZ,ANALÍA F; GIARRATANO,ERICA; MALANGA,GABRIELA.
We assessed several biomarkers of oxidative damage on silversides Odontesthes nigricans from Varela and Golondrina bays, located on the North shore of the Beagle Channel (Tierra del Fuego, Argentina) and we tried to relate those responses to environmental data. Varela bay is visited mostly by local fishermen and tourism during the spring-summer season; on the other hand Golondrina bay is a low urban impacted area, despite the population's growth around it. We employed the condition factor as general biomarker of fish health and quantified biomarkers of oxidative damage in gills and liver. Fishes from Golondrina bay showed a better condition as compared to those from Varela bay. The activity of enzymatic antioxidants and the content of non-enzymatic...
Tipo: Journal article
Palavras-chave: Beagle Channel; Odontesthes nigricans; Oxidative stress biomarkers.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400007

Bases Anatómicas de la Gluteoplastía Dinámica
Provedor de dados: 77
Autores: Borgno,Laura; Scanniello,Varinia; Rompani,Omar; Laxague,Alejandra; Páez,Sofía.
La disrupción anatómica del esfínter es el mecanismo más común de incontinencia fecal. La creación de un mecanismo esfinteriano con control voluntario permite mantener la contracción en el reposo o durante los movimientos y es uno de los principios fisiológicos y quirúrgicos para la continencia. Esta corrección puede realizarse mediante la transposición de músculo glúteo mayor alrededor del ano y recrear así un esfínter voluntario. La gluteoplastía dinámica consiste en la colocación de un marcapasos que permite la estimulación eléctrica crónica intermitente del músculo esquelético, resultando en la adaptación de la contractilidad basal. El objetivo del trabajo consiste en el estudio anatómico de la longitud in situ y esqueletizado del fascículo inferior...
Tipo: Journal article
Palavras-chave: Gluteoplastía; Músculo glúteo máximo; Incontinencia anal.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300005

Bases fisiológicas para una interacción entre las células cromafines y las endoteliales de la glándula adrenal
Provedor de dados: 97
Autores: LUXORO,MARIO; VINET,RAUL.
En este trabajo tratamos de investigar las posibles interacciones entre las células endoteliales de la glándula adrenal y aquellas sustancias relacionadas con la secreción de las células cromafines. Para lo anterior, estudiamos el efecto de acetilcolina (ACh), o de catecolaminas (CA) tanto en el nivel de Ca2+ citoplasmático ([Ca2+]i), como en el potencial de membrana de las células endoteliales. Nuestros resultados muestran que tanto la ACh como la nicotina, pero no la muscarina, son capaces de inducir un aumento del [Ca2+]i y una despolarización de la membrana plasmática de las células endoteliales. El antagonista nicotínico, hexametonium, bloquea tanto el efecto de la ACh como de la nicotina lo que sugiere la presencia de receptores nicotínicos. Por otra...
Tipo: Journal article
Palavras-chave: Endoteliales; Cromafines; Receptores; Interacciones.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000009

Batch and fixed-bed column biosorption of manganese ion by Sargassum filipendula
Provedor de dados: 69
Autores: Henriques,Cristiane Assumpção; da Costa,Antonio Carlos Augusto; dos Reis,Marcelo Martins; Costa,André Luiz Hemerly; Luna,Aderval Severino.
This paper presents experimental data of the biosorption of manganese onto Sargassum filipendula in both batch and fixed-bed column systems. Batch equilibrium data were used for nonlinear fittings of the Langmuir and Freundlich isotherms. A mathematical model based on mass balances in the fluid and in the sorbent was applied to represent the experimental fixed-bed column data. The utilization of isotherm parameters from the batch experiments in the breakthrough model implied a significant mismatch in relation to the laboratory data. Alternatively, additional fixed-bed column data provided new parameters for the isotherm evaluation, and the corresponding simulated profile of the breakthrough curve reached better agreement to the experimental results.
Tipo: Journal article
Palavras-chave: Biosorption; Breakthrough curve; Equilibrium isotherm; Manganese; Metal removal.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500008

Batch culture growth of Chlorella zofingiensis on effluent derived from two-stage anaerobic digestion of two-phase olive mill solid waste
Provedor de dados: 69
Autores: Travieso Córdoba,Lissette; Domínguez Bocanegra,Alma Rosa; Rincón Llorente,Bárbara; Sánchez Hernández,Enrique; Benítez Echegoyen,Francisco; Borja,Rafael; Raposo Bejines,Francisco; Colmenarejo Morcillo,Manuel Francisco.
This paper presents the use of an effluent derived from two-stage anaerobic digestion of two-phase olive mill solid waste (OMSW) as a substrate for the production of Chlorella zofingiensis in batch mode. Chlorella zofingiensis when grown autotrophycally can accumulate significant quantities of valuable carotenoids which are used as an additive in fish and poultry farming, as colorants in foods and in health care products. It was found that two-phase OMSW previously treated by two-stage anaerobic digestion and further sterilized may be used as a culture medium for the microalgae Chlorella zofingiensis. Typical growth curves were obtained using both the above-mentioned anaerobic effluent and a synthetic medium. Total chemical oxygen demand (TCOD) and soluble...
Tipo: Journal article
Palavras-chave: Batch culture; Chlorella zofingiensis; Kinetic parameters; Substrate; Two-phase olive mill solid waste; Two-stage anaerobic digestion.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200003

Baybean ( Canavalia rosea (Sw.) DC.); organogenesis, morphological and anatomical studies
Provedor de dados: 73
Autores: Mohajer,Sadegh; Taha,Rosna Mat; Mohamed,Normadiha; Razak,Ummi Nur Abdul.
ABSTRACT Morphological and anatomical studies comprised leaf venation, histological analysis and epidermal peeling were carried out on Canavalia rosea (Sw.) DC.). Anatomical studies of the leaf and root determined the presence of cuticle and oil glands, arrangement of cells and the structure of vascular system. The dorsiventral leaf with pinnate venation and amphistomatic leaf with paracytic type stomata were embedded below the epidermis. Trichomes and oil glands were also observed on both adaxial and abaxial surfaces of leaf. Longitudinal sections of the callus showed the existence of meristematic cells, which could give rise to plant regeneration. In the process of organogenesis, adventitious shoots emerged from leaf and stem explants within 2 months...
Tipo: Journal article
Palavras-chave: Leaf architecture; Histology; Hormone; 6-benzyladenine; Trichomes; SEM.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100120

Bayesian Analysis of the Genetic Control of Survival in F3 Families of Common Bean
Provedor de dados: 117
Autores: Mora,Freddy; Gonçalves-Vidigal,Maria C; Santos,Alexandra I.
The objectives of this study were to examine the genetic control of survival in segregant families F3 of the common bean (Phaseolus vulgaris L.) in southern Brazil during the 2004-2005 growing season, to identify useful genotypes for the breeding program of this crop, and to determine the genetic association between survival and weight of 100 seeds (production trait; P100). A Bayesian approach was used to predict breeding values and to estimate variance components. Survival was recorded as a binary response: dead plant or live plant during harvest. The total population consisted of 11,520 individual plants. The difference in the magnitude between the best and the worst families was as high as 22%, and varied from 57 to 73%. Survival was found to be highly...
Tipo: Journal article
Palavras-chave: Genetic improvement; Breeding; Gibbs algorithm; Heritability.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400003

Bayesian analysis of the genetic structure of a Brazilian popcorn germplasm using data from simple sequence repeats (SSR)
Provedor de dados: 117
Autores: Saavedra,Javier; Silva,Tereza Aparecida; Mora,Freddy; Scapim,Carlos Alberto.
Several studies have confirmed that popcorn (Zea mays L. var. everta) has a narrow genetic basis, which affects the quality of breeding programs. In this study, we present a genetic characterization of 420 individuals representing 28 popcorn populations from Brazilian germplasm banks. All individuals were genotyped using 11 microsatellite markers from the Maize Genetics and Genomics Database. A Bayesian clustering approach via Monte Carlo Markov chains was performed to examine the genetic differentiation (Fst values) among different clusters. The results indicate the existence of three distinct and strongly differentiated genetic groups (K = 3). Moreover, the Fst values (calculated among clusters) were significantly different according to Bayesian credible...
Tipo: Journal article
Palavras-chave: Genetic differentiation; Microsatellite markers; Bayesian clustering; Monte Carlo Markov chains.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200003

Beef Consumer Preferences in Chile: Importance of Quality Attribute Differentiators on the Purchase Decision
Provedor de dados: 117
Autores: Villalobos,Pablo; Padilla,Carlos; Ponce,Cristian; Rojas,Álvaro.
Agrifood markets worldwide have focused on searching for new quality attribute differentiators, which capture the attention of consumers and meet their needs. The purpose of this research was to determine the importance of a set of quality attribute differentiators associated with a beef cut on the choice behavior of the Chilean consumer. The evaluated differentiating characteristics were: price, origin, production method, and quality assurance. A total of 750 subjects were surveyed in the following cities: Talca, Rancagua, and Santiago. Conjoint analysis was carried out to estimate the impact of the assessed attributes on the purchase decision of the consumers polled. Findings point out that the quality attribute differentiators significantly influence...
Tipo: Journal article
Palavras-chave: Conjoint analysis; Country of origin; Animal welfare; Quality assurance; Differentiation; Marketing.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100009

Behavior of Araujiain, a new cysteine phytoprotease, in organic media with low water content
Provedor de dados: 69
Autores: Quiroga,Evelina; Priolo,Nora; Marchese,José; Barberis,Sonia.
In this paper we studied the effect of different organic solvents (1-octanol, trichloroethylene, ethanol, ethyl acetate, tetrahydrofuran, cyclohexane, propanone, acetonitrile, dichloromethane, chlorobenzene, N,N-dimethylformamide, acetophenone, diethyl ether, methanol, ethylene glycol and toluene) with low and constant water content on substrate preferences, thermostability and stability (caseinolytic activity retention after 4 h) of proteases of Araujia hortorum Fourn. (Asclepiadaceae). The stability of araujiain was high in N,N-dimethylformamide and ethanol at 40&amp;ordm;C, but decreased at higher temperature. Araujiain substrates preferences in buffer Tris-HCl (pH 8), ethylene glycol and N,N-dimethylformamide exhibited different patterns, but the...
Tipo: Journal article
Palavras-chave: Araujia hortorum Fourn; Organic solvents; Plant protease; Substrate preferences; Thermostability.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100004

Behavior of grazing European wild boar (Sus scrofa) in a semi-extensive production system
Provedor de dados: 118
Autores: Hodgkinson,Suzanne M; Matus,Felipe; Lopez,Ignacio F.
In the semi-extensive farming systems that are used to raise European wild boar in countries such as Chile, the behavior of the animals in paddocks has not been studied and is important for managing the system. The objective of the present study was to determine the proportion of time that grazing wild boar spent on different activities and the distribution of these activities during the day. The study was conducted in paddocks containing Cynodon dactylon, Lolium perenne and Poa pratensis. A total of 35 purebred European wild boars with a liveweight (average + SEM) of 37.4 + 1.11 kg with noserings were used in the study. The animals were in the paddocks from 08:30 h until 16:30 h, after which they had free access to a commercial diet for one hour and were...
Tipo: Journal article
Palavras-chave: Behavior observations; Behavior patterns; European wild boar; Grazing.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100017

Behavioral experiments in a wild passerine cause short-term reductions in parental provisioning and nestling mass
Provedor de dados: 97
Autores: VAN DONGEN,WOUTER F.D; LAZZONI,ILENIA; VÁSQUEZ,RODRIGO A.
Research on wild animals often involves the capture and temporary removal of individuals from their territory. Although the acute effects of such procedures are well understood in terms of stress hormone profiles, their effect on the behaviour of captured individuals after release is poorly known. Additionally, for socially-monogamous individuals captured whilst breeding, little is known regarding whether the remaining individual compensates for the temporary loss of its partner and whether offspring condition or survival ultimately decreases due to any reductions in parental provisioning. We investigated the influence of field-based experiments requiring temporary adult removal on adult provisioning behaviour and nestling mass in the thorn-tailed rayadito...
Tipo: Journal article
Palavras-chave: Aphrastura spinicauda; Nestling condition; Parental provisioning; Temporary adult removal; Thorn-tailed rayadito.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000200005

Beneficial Effects of Angiotensin II AT1 Blocker on Cardiovascular Adverse Remodeling Due to Nitric Oxide Synthesis Blockade
Provedor de dados: 77
Autores: Fernandes-Santos,Caroline; Mendonça,Leonardo de Souza; Mandarim-de-Lacerda,Carlos Alberto.
We studied with morphological tools the effects of different doses of Losartan upon the cardiovascular remodeling in nitric oxide deficient rats. At 15 weeks of age, thirty Wistar rats were separated in six groups: control (C), L-NAME (LN), and four groups were LN was given plus Losartan at different doses (1, 5, 20 and 40 mg/kg/day). The L-NAME was given for 9 weeks, the Losartan administration starting on the 2nd week of experiment. We studied the heart, thoracic aorta and superior mesenteric artery with light microscopy and stereology. The blood pressure (BP) increased since the first week of L-NAME administration, the Losartan treatment at doses of 20 and 40 mg/kg/day was efficient to reduce BP after the 7th week of treatment. The cardiac adverse...
Tipo: Journal article
Palavras-chave: Losartan; Angiotensin II; L-NAME; Hypertension; Renin-angiotensin system; Stereology; L-NAME.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400003

Beneficial Effects of Exercise Training (Treadmill) on Body Mass and Skeletal Muscle Capillaries/Myocyte Ratio in C57BL/6 Mice Fed High-Fat Diet
Provedor de dados: 77
Autores: Motta,Victor Faria; Mandarim de Lacerda,Carlos Alberto.
C57BL/6 mice develop signals and symptoms comparable at least in part with the metabolic syndrome in humans. This study aimed to evaluate the beneficial effects of exercise training upon skeletal microcirculation in these mice. Animals were fed one of two diets during an eight week period: standard chow (SC) or very high-fat (HF). Afterwards, the exercise training protocol (treadmill) was established and mice divided into SC and HF sedentary (SC-Sed, HF-Sed) or exercised groups (SC-Ex, HF-Ex), respectively. HF/HF-Sed mice had the greatest body mass (plus 65% than SC-Sed; P&lt;0.0001), and exercise reduced it by 23% (P&lt;0.0001). The plasma insulin was higher in the HF-Sed than in the matched ­Ex (P&lt;0.001). The ratio between capillaries/myocytes in...
Tipo: Journal article
Palavras-chave: Aerobic training; Metabolic syndrome; Lipid profile; Skeletal muscle.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100037

Benign Inclusions in Lymph Nodes
Provedor de dados: 77
Autores: Spinardi,Julia Regazzini; Goncalves,Isis  Rocha Dias; La Falce,Thiago Souza; Fregnani,José Humberto Tavares Guerreiro; Barros,Mirna Duarte; Macea,José Rafael.
Benign inclusions are foci of non-neoplastic ectopic tissue in lymph nodes. They are classified into three types: epithelial, nevomelanocytic and decidual. It is important to identify them for the differential diagnosis with lymph node metastases, particularly among patients who present proliferative benign lesions. In general, epithelial inclusions are presented inside lymph nodes as epithelial cysts or as numerous structures resembling ducts. The cells of these structures may originate from the cells of paramesonephricus ducts, salivary glands, breast tissue, thyroid follicles, squamous epithelium or mesothelium. Paramesonephricus -type inclusions are almost exclusively found in pelvic lymph nodes and, in appearance, they resemble the epithelium of the...
Tipo: Journal article
Palavras-chave: Ectopic tissues; Lymph node; Melanocyte; Paramesonephricus ducts; Thyroid gland; Breast.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300026

BENTAZON-MCPA EFFECT ON Fusarium oxysporum ROOT ROT ON Trifolium pratense IN GREENHOUSE CONDITIONS
Provedor de dados: 127
Autores: Ceballos,Ricardo; Cofre,Ximena; Quiroz,Andrés; Espinoza,Nelson; Palma,Graciela.
In Chile, the main factor in red clover {Trifolium pretense L.) stand decline is fusarium-root rot, which results in a reduction in yield. Fusarium oxysporum (Schlect.) is the most prevalent pathogen recovered from diseased red clover roots plants. Agronomical management of red clover includes application of broadleaf herbicides such as MCPA and bentazon. This study was conducted to evaluate the effects of bentazon and bentazon/MCPA mixture on phytotoxicity and root rot as caused by F. oxysporum on red clover, under greenhouse conditions. In addition, in vitro mycelial growth and conidial germination of F. oxysporum was studied. A reduction of 40% in crown diameter and 57% shoot dry weight was observed 30 days after treatment with a high rate of...
Tipo: Journal article
Palavras-chave: Herbicide; Fusariosis; Legume; Plant diseases.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000200006

Benthic diversity in a submarine canyon in the Argentine sea
Provedor de dados: 97
Autores: BREMEC,CLAUDIA; SCHEJTER,LAURA.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000300012

Benzothiadiazole (BTH) induces resistance to Pepper golden mosaic virus (PepGMV) in pepper (Capsicum annuum L.)
Provedor de dados: 48
Autores: Trejo-Saavedra,D.L; García-Neria,M.A; Rivera-Bustamante,R.F.
Pepper is an economically important crop in many countries around the world but it is susceptible to many diseases. In Mexico, diseases caused by bipartite begomoviruses have emerged as important problems in pepper. Several control strategies have been explored wiht little success; most of them are based on the avoidance of virus transmission and the breeding for resistance. Abiotic inducers can act at various points in the signaling pathways involved in disease resistance, providing long-lasting, wide-spectrum resistance. Benzothiadiazole (BTH) shares the property of activating the systemic acquired resistance pathway downstream from the SA signaling. In this work, resistance to PepGMV infection was induced in pepper plants by activating the SA pathway...
Tipo: Journal article
Palavras-chave: Geminivirus; Systemic acquired resistance; Induced resistance; BTH.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400004

Betalaínas, polifenoles y actividad antioxidante en tuna roja mínimamente procesada, almacenada en atmósferas controladas
Provedor de dados: 73
Autores: ALBA-JIMÉNEZ,JIMENA ESTHER; CHÁVEZ-SERVIA,JOSÉ LUIS; VERDALET-GUZMÁN,IÑIGO; JESÚS MARTÍNEZ,ARMANDO; AQUINO-BOLAÑOS,ELIA NORA.
La tuna roja de Opuntia ficus-indica (L.) Mill. (Cactaceae) es una fuente importante de compuestos biactivos y funcionales, pero tiene dificultades para su almacenamiento y comercialización. Por lo tanto se realizó un estudio del efecto de las atmósferas controladas sobre los frutos mínimamente procesados para conservar los compuestos antioxidantes a temperatura de 5 °C y durante 16 días de almacenamiento en atmósferas controladas. Al final del mismo se registró que los tratamientos con 5% O2 + 95% N2 y 10% CO2 + 5% O2 + 85% N2 mantuvieron el nivel de betalaínas (125,6 mg l-1, 126,16 mg l-1) y actividad antioxidante (263,7 &amp;#956;mol Eq Trolox 100 ml-1, 267,6 &amp;#956;mol Eq Trolox 100 ml-1), respecto al contenido inicial evaluado (116,1 mg l-1, 270,4...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200005

Betamethasone inhibits tumor development, microvessel density and prolongs survival in mice with a multiresistant adenocarcinoma TA3
Provedor de dados: 48
Autores: Garrido,Osvaldo; Letelier,René; Rosas,Carlos; Fuenzalida,Marcela; Ferreira,Arturo; Lemus,David.
Tumor resistance to traditional cancer treatments poses an important challenge to modern science. Thus, angiogenesis inhibition is an important emerging cancer treatment. Many drugs are tested and corticosteroids have shown interesting results. Herein we investigate the effect on microvessel density, survival time and tumoral volume of mice with TA3-MTX-R tumors. Twenty six mice were inoculated with lxlO6 tumor cells, 4-5 days after injection, six mice were injected with PBS (group A) and twenty mice were treated with p-met (group B). All animals from Group A died on day 22. Group B was divided into Bl (treated discontinued) and B2 (treated daily) and observed until day 88. All mice were processed for histo-immunohistochemical analysis and the blood...
Tipo: Journal article
Palavras-chave: Angiogenesis; Betamethasone treatment; Metastasis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300008

Beyond Darwin: On the role of niche construction and self-organization in evolution
Provedor de dados: 97
Autores: MARQUET,PABLO A.
In this essay I point out to two processes that can potentially complement the classical view of evolution by natural selection as outlined by Darwin, which captures only part of the processes driving adaptive evolution. This classical view should be complemented with sources of order generated within the biological system itself in response to its own structure and dynamics (i.e. self-organization) and by considering the existence of a fundamental circularity in the interaction between the organism and its environment, such that the action of the organisms modify their selective environment thereby affecting their own evolution. The formalization and inclusión of these two processes (and their interaction) represent major challenges and opportunities for...
Tipo: Journal article
Palavras-chave: Darwin; Natural selection; Self-organization.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400004

Beyond selection
Provedor de dados: 97
Autores: VARGAS,ALEXANDER O.
It has been argued that the study of natural selection and quantitative genetics should have a central role in evolutionary thinking and undergraduate teaching in Chile. Extensive operational use of the concept of natural selection may seem consistent with this argument. However, advances of evolutionary knowledge in independent fields such as phylogenetic analysis, developmental evolution, and paleontology cannot be ignored. I argue here that the role of natural selection in contemporary evolutionary biology can be compared to that of Newtonian mechanics in contemporary physics: it can describe a given domain of observations, but it is insufficient to handle the different sources of evolutionary knowledge. Overemphasis on natural selection as the...
Tipo: Journal article
Palavras-chave: Evolution; History; Development; Epigenesis; Drift.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400012

Biceps Brachii Muscle Innervation Zone Location in Healthy Subjects Using High-Density Surface Electromyography
Provedor de dados: 77
Autores: Guzmán,Rodrigo A; Silvestre,Rony A; Arriagada,David A.
Among the sequelae of central nervous system injury is spasticity which is difficult to manage in rehabilitation. Current treatments consider the administration of the botulinum toxin. However, results have proved highly variable in terms of effectiveness, attributable to the distance between the injection site and the innervations-zone (IZ). High Density sEMG (HDsEMG) has been used to gather information about muscle physiology and for location of the IZ. The aim of this study was to characterize the IZ of the biceps brachii muscle in healthy subjects during isometric contraction. We assessed the biceps brachii muscle of twenty healthy subjects (n=20) using a 64 surface electrodes matrix. The average location of the IZ was 34% distal to the line between...
Tipo: Journal article
Palavras-chave: Innervation zone; High density EMG; Motor unit; Muscle; Biceps brachii muscle.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200007

Bidimensional transfer of effects among organisms: An overlooked concept in community ecology
Provedor de dados: 97
Autores: RAMOS-JILIBERTO,RODRIGO; ARÁNGUIZ-ACUÑA,ADRIANA.
Although geneticists and population ecologist have considered in their explanations the importance of both horizontal -interspecific- and vertical -intraspecific- paths for the flow of information, energy or matter among organisms, community ecology and particularly network ecology have been strongly biased towards considering only horizontal effects. In this article our aim is to put on view of ecologists the concepts of vertical and horizontal transfer of disturbance effects in communities, and discuss the relevance of the interplay between both processes for ecological research. We support that incorporating this view into community ecology could be a promising new research avenue, and may improve our understanding about the responses of communities to...
Tipo: Journal article
Palavras-chave: Ecological networks; Ecological interactions; Food webs; Horizontal effects; Vertical effects.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000100002

Bifid Condylar Process: Cases Report
Provedor de dados: 77
Autores: Fuentes Fernández,Ramón; Flores Flores,Homero; Silva Mella,Héctor; Flores Lillo,Tania.
The bifid condylar process is a rare anomaly. Most of the known cases are radiographic findings, mainly in ortopantomography and nuclear magnetic resonance. The condition is usually asymptomatic, while in some cases are associated with ankylosis of the temporomandibular joint. It is reported that the presence of bifid condylar process is not determined by age and gender, but the findings are among the ages of 3 to 67 years, with the average age of 35 years. The present report presents two cases of patients with abnormalities of condylar process detectable through radiographic examination.
Tipo: Journal article
Palavras-chave: Condylar process; Mandibular condyle; Panoramic radiography; Anatomic variation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200038

Bifocal Distraction in Patient with Rheumatoid Arthritis and Severe Condylar Degeneration: Report of Case
Provedor de dados: 77
Autores: Chaves Neto,Henrique Duque de Miranda; Olate,Sergio; Mazzonetto,Renato; Spagnoli,Daniel B.
Facial involvement in patients with rheumatoid arthritis is variable depending on the type, onset, and duration of the disease. The treatment of patients with open bite resulting from degenerative changes on the condyles can be a challenge for the surgeon. Rheumatoid arthritis is a systemic disorder of unknown etiology characterized by chronic inflammation and proliferation of synovial tissue. Studies showed that patients with rheumatoid arthritis can developed progressive osteoarthrosis that result in gross radiographic changes in the condyles. With the development of distraction osteogénesis for treatment of mandible hypoplasia a new chapter has been opened in the surgical management of patients with rheumatoid arthritis associated with skeletal...
Tipo: Journal article
Palavras-chave: Bifocal distraction; Rheumatoid arthritis; Condylar degeneration.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100033

Bifosfonatos y Osteonecrosis de los Maxilares: Consideraciones Sobre su Tratamiento
Provedor de dados: 77
Autores: Jaimes,Miguel; Chaves Netto,Henrique Duque de Miranda; Olate,Sergio; Chaves,Maria das Graças Alfonso Miranda; Barbosa,José Ricardo de Albergaria.
Los bifosfonatos son potentes inhibidores de los osteoclastos, son drogas usadas principalmente para el tratamiento de mieloma múltiple y en metástasis óseas de tumores sólidos como el cáncer de mama. En el año 2003 fue relatado el primer caso de osteonecrosis de los maxilares (ONM) asociado al uso de bifosfonatos, sin embargo aun no se ha establecido una relación causa efecto de estas drogas sobre la ONM. La incidencia en tiempos anteriores en relación al uso de bifosfonatos era muy baja, siendo que hoy día alcanza 10% o más en las patologías mencionadas tratadas con estas drogas. Este artículo tiene por objetivo alertar sobre una posible complicación en pacientes que hacen uso de bifosfonatos, a través de la revisión de la literatura y la presentación de...
Tipo: Journal article
Palavras-chave: Bifosfonatos; Osteonecrosis; Cáncer; Osteomielitis; Metástasis ósea.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300028

Bilateral Absence of Gemelli Muscles: Case Report
Provedor de dados: 77
Autores: Cerda,Aladino; López,Bernarda.
The gemelli are deep muscles, which act together with the obturator internus muscle, stabilizing dynamically the hip joint. In the present article, a case of bilateral absence of both gemelli muscles in the pelvis of a female cadaver is described. A possible embryological explanation of this condition is discussed, besides its clinical and surgical importance.
Tipo: Journal article
Palavras-chave: Superior gemellus muscle; Inferior gemellus muscle; Anatomical variations.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100031

Bilateral Absence of Superior Gemellus Muscle in Elderly Cadaver
Provedor de dados: 77
Autores: Fernandes,Rodrigo M. P; Lazzoli,José K; Manaia,Jorge H. M; Babinski,Marcio A.
The superior gemellus muscle (SGM) normally arises from the outer surface of the spine of the ischium, blends with the upper part of the tendon of the obturator internus, and is inserted with it into the medial surface of the greater trochanter. In this paper, we describe an anatomical variation in which the SGM is absent bilaterally. Therefore, as there are not many cases in literature, our attention has been drawn to the importance about absence of SGM, in order to improve anatomical and clinical knowledge about this finding.
Tipo: Journal article
Palavras-chave: Gross anatomy; Gemellus superior muscle; Anatomical variation.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300020

Bilateral Bifid Condylar Process
Provedor de dados: 77
Autores: Gunduz,Kaan; Avsever,Hakan; Karacayli,Umit.
The bifid condylar process is a rare alteration that is usually diagnosed as an incidental finding in a panoramic radiograph. The etiology of bifid condylar process is unknown, although the most tenable theory is that of traumatic origin. A 46-year-old woman was referred to our dental department with a complaint of pain and clicking on her temporomandibular joints. A panoramic radiograph showed bilateral bifid condyles Described with bifid condylar process varies from case to case, however in most cases are asymptomatic. The most common and predominant symptoms are temporomandibular joints sounds. The diagnosis of bifid condylar process is based on its radiographic appearance. Some researchers have indicated the necessity of imaging the anomaly by a second...
Tipo: Journal article
Palavras-chave: Bifid condylar process; Computed tomography; Panoramic.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300045

Bilateral Bifid Mandibular Condyle: A Case Report
Provedor de dados: 77
Autores: Melo,Suzana Lubambo de; Barbosa,Joanna Martins Novais; Peixoto,Aline Carvalho; Santos,Thiago de Santana; Gerbi,Marleny.
The bifid mandibular condyle is an exceedingly rare anomaly, frequently diagnosed as an incidental finding in a panoramic radiograph. Its etiology and pathogenesis are unknown, though the most acceptable theory suggests that trauma is at the origin of the condition. This article reports a new case of bilateral bifid condyle in a 21-year-old female with history of trauma in childhood.
Tipo: Journal article
Palavras-chave: Condylar process; Mandibular condyle; Anatomic variation; Computed tomography.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300043

Bilateral Duplication of Gonadal Veins: a Case Report
Provedor de dados: 77
Autores: Ruiz Fernandes,Juliana; Bassi Strufaldi,Maíra; Machado,Bruno dos Santos; Rios Nascimento,Sergio Ricardo; Wafae,Nader; Ruiz,Cristiane Regina.
The duplication of gonadal vessels is mainly found on the left side, with less numbers of bilateral cases. The objective of this work is describing a case of bilateral duplication of gonadal veins, where two veins were draining to inferior vena cava, being that the closest vein of kidney medial margin had a thickness of 2.68mm and was distant 64.41 mm of the organ. The second vessel had a thickness of 1.43mm and was distant 73.76mm. Two veins follow to left renal vein, being that the first vessel had a thickness of 2.7mm and was distant 21.8mm of the kidney medial margin; the other had a thickness of 1.64mm and was distant 35.13mm of the organ. The presence of variations on the local of drainage of gonadal vessels has clinical importance for comprehension...
Tipo: Journal article
Palavras-chave: Macroscopic anatomy; Dissection; Anatomical variation; Gonadal vessels; Varicocele.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400035

Bilateral Origin of the Testicular Arteries from the Lower Polar Accessory Renal Arteries
Provedor de dados: 77
Autores: Panagouli,Eleni; Lolis,Evangelos; Venieratos,Dionysios.
The gonadal arteries (testicular or ovarian arteries) emerge normally from the lateral aspect of the abdominal aorta, a little inferior to the renal arteries. Several other sites of origin of these arteries have been recorded with the renal and accessory renal arteries being the most common. In the present case report, the testicular arteries originated from the lower polar accessory renal arteries in both sides. The testicular veins followed had the usual origin and course, while an accessory renal vein was observed only in the right side. These anomalies were combined with an abnormal left ureter exiting from the lower pole of the kidney. Only one male cadaver among 77 adult human cadavers of Caucasian origin presented this set of variations (frequency:...
Tipo: Journal article
Palavras-chave: Gonadal arteries; Kidney; Ureter; Abdominal aorta.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400010

Bilateral Presence of Axillary Arch Muscle Passing Through the Posterior Cord of the Brachial Plexus
Provedor de dados: 77
Autores: Pillay,Minnie; Jacob,Suja Mary.
The axillary arch can be described as an anomalous muscular slip of latissimus dorsi muscle. In this paper, a rare case of bilateral axillary arch is reported during routine dissection of the axillary region of a 57-year old male cadaver. On both sides, the axillary arch muscle took origin from latissimus dorsi and teres major, and passed upwards through the posterior cord of the brachial plexus, but posterior to the bulk of axillary neurovascular bundle. It then split into two slips: the medial slip was inserted into the root of the coracoid process, while the lateral slip which was intracapsular, was attached to the lesser tubercle, above the attachment of subscapularis. The presence of the muscle has important clinical implications, and the position,...
Tipo: Journal article
Palavras-chave: Axillary arch muscle; Posterior cord of brachial plexus; Axillary anatomy.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400015

Bilateral Supernumerary Sternocleidomastoid Heads with Critical Narrowing of the Minor and Major Supraclavicular Fossae: Clinical and Surgical Implications
Provedor de dados: 77
Autores: Raikos,Athanasios; Paraskevas,George K; Triaridis,Stefanos; Kordali,Panagiota; Psillas,George; Brand-Saberi,Beate.
Anatomical variations of the sternocleidomastoid muscle are rare and concern its origin, insertion, and the number of heads. We report on a rare bilateral variant of the sternocleidomastoid muscle with aberrant and supernumerary muscular heads, observed in a cadaveric subject. On the right side of the neck, a typical sternomastoid head of the sternocleidomastoid muscle, and three aberrant clavicular heads of variable thickness, origin, and termination were noticed. On the left side, two sternomastoid heads were present; the medial one was of typical pattern, while the lateral was supernumerary. The cleidomastoid portion of the left sternocleidomastoid muscle was fused with the double sternomastoid segment. A strap-like muscle originating from the middle...
Tipo: Journal article
Palavras-chave: Cleidocervical; Cleido-occipital; Sternocleidomastoid; Sternomastoid; Supraclavicular fossa; Ultrasound; Variant.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300027

Bilateral Triad of Persistent Median Artery, a Bifid Median Nerve and High Origin of its Palmar Cutaneous Branch: A Case Report and Clinical Implications
Provedor de dados: 77
Autores: Ariyo,Olutayo; Shea,John.
We report the association of a persistent median artery, a bifid median nerve with a rare very high origin palmar cutaneous branch, presenting bilaterally in the upper limb of a 75-year-old female cadaver. The persistent median nerve with a bifid median nerve has been reported in patients presenting with carpal tunnel syndrome. Reports of this neurovascular anomaly occurring in association with a high origin palmar cutaneous branch however, are few. This subset of patients is at risk of inadvertent nerve transection during forearm and wrist surgery. Pre-operative magnetic resonance imaging (MRI) and high resolution sonography (HRS) can be used to screen this triad. MRI can reveal if the patient's disability is associated with a persistent median nerve, a...
Tipo: Journal article
Palavras-chave: Carpal tunnel syndrome; High arising palmar cutaneous branch; Inadvertent ligation; Persistent median nerve; Bifid median nerve.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300030

Bilateral Variations and Sexual Dimorphism in Morphometric Parameters of Infraorbital Groove, Canal and Foramen in Human Foetuses
Provedor de dados: 77
Autores: Ghaus,Farah; Faruqi,N. A.
Foetal anatomy seems to be highly promising developing speciality in the recent past. Maxilla is the key to facial skeleton. Its anatomy in general and bilateral variations along with sexual dimorphism in particular are of great surgical and forensic importance.Thirty two maxillae of sixteen human foetuses (21 wks to 34 wks) were considered to measure lengths of infraorbital groove and canal, widths of ends of infraorbital groove, diameters of infraorbital foramen and the distances of latter from infraorbital margin and nasal notch. Groups I (21-25 wks) and II (26-30 wks) foetuses were crucial for bilateral variations for most of the parameters. Distance between infraorbital foramen and nasal notch showed variations on two sides in maximum foetal groups....
Tipo: Journal article
Palavras-chave: Bilateral variation; Sexual dimorphism; Infraorbital groove; Infraorbital canal; Infraorbital foramen; Human foetuses.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200027

Bioactivity of a water extract of boldus (Peumus boldus Molina) against Spodoptera frugiperda (J.E. Smith) and Helicoverpa zea Boddie (Lepidoptera: Noctuidae)
Provedor de dados: 117
Autores: Silva,Gonzalo; Rodríguez,J. Concepción; Blanco,Carlos A; Lagunes,Angel.
The insecticidal properties of water-extract of Peumus boldus Molina and its effect on the development cycle and feeding habits of Spodoptera frugiperda J.E. Smith and Helicoverpa zea Boddie were evaluated under laboratory conditions in concentrations of 0.25, 0.5, 1.0, 2.0, 4.0, and 8.0% (w/w). Spodoptera frugiperda was the most susceptible with 75% mortality at 7 d at 8% P. boldus concentration, while H. zea had only 30% mortality. LC50 was 2.31 mL kg-1 for S. frugiperda and 16.05 mL kg¹ for H. zea. When the extract concentration increased in the diet, larval size and weight, percentage of pupation and number of adults decreased, and the time required to reach those states was greater. Neonate larvae fed primarily on the diet with the lower extract...
Tipo: Journal article
Palavras-chave: Fall armyworm; Corn earworm; Botanical insecticides; Nutritional indexes.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200008

Bioactivity of crude ethanol extract and fractions of Eugenia uniflora (Myrtaceae) in the hepatopancreas of Oreochromis niloticus L
Provedor de dados: 48
Autores: FIUZA,TATIANA S; SILVA,PAULO C; PAULA,JOSÉ R DE; TRESVENZOL,LEONICE M F; SABÓIA-MORAIS,SIMONE M T.
This study evaluates the bioactivity of the crude ethanol extract and ethyl acetate, hexane and chloroform fractions obtained from Eugenia uniflora leaves using the hepatopancreas of Oreochromis niloticus L. as an experimental model. The ethanol extract and fractions were administered to the fish orally with their feed. Twenty-four hours later, the fish were sacrificed and their livers dissected, fixed in neutral formalin, embedded in paraffin and sectioned. Histological analyses were performed using Masson's trichrome and Haematoxylin-Eosin. Histochemical studies were performed using Feulgen, PAS (Periodic Acid Schiff) and PAS + salivary amylase and Sudan IV stain. The qualitative analysis of the material showed that the crude extract and the ethyl,...
Tipo: Journal article
Palavras-chave: Fish; Medicinal plants; Vasodilation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000400002

Bioactivity of Lantana camara L. essential oil against Callosobruchus maculatus (Fabricius)
Provedor de dados: 117
Autores: Zandi-Sohani,Nooshin; Hojjati,Mohammad; Carbonell-Barrachina,Ángel A.
Lantana camara L. is a widespread plant species mostly native to subtropical and tropical regions of the world. In this study, insecticidal and repellent activities of L. camara essential oil were evaluated against Callosobruchus maculatus (Fabricius) (Col: Bruchidae). Analysis of chemical composition by gas chromatography/mass spectrometry (GC/MS) showed high amounts of sesquiterpenes, mainly &amp;#945;-humelene (23.3%) and cis-caryophyllene (16.2%). The results showed that the essential oil of L. camara has strong repellent activity against adults of C. maculatus at all tested concentrations. After 2 and 4 h, 97.4 and 100% repellency was seen at highest concentrations of 0.4 &amp;#956;L cm-2, respectively. Moreover, the oil was found to be toxic to...
Tipo: Journal article
Palavras-chave: Fumigant; Insecticidal activity; Bean protection; Lantana camara.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400007

Bioactivity of Scytonema hofmanni (Cyanobacteria) in Lilium alexandrae in vitro propagation
Provedor de dados: 69
Autores: Zaccaro,María Cristina; Kato,Adriana; Zulpa,Gloria; Storni,Mónica Magdalena; Steyerthal,Noemí; Lobasso,Karina; Stella,Ana María.
Cyanobacteria produces bioactive compounds including plant growth regulators. Naphthalene acetic acid (NAA), a toxic substance, is a synthetic plant regulator used in micropropagation. The aim of this work was to evaluate morphogenetic and antioxidant effects produced by intra and extracellular substances from Scytonema hofmanni (Cyanobacteria) during the multiplication in vitro of Lilium alexandrae and to compare them to those produced by NAA. Intra and extracellular cyanobacterial products increased a) bulblets production reaching 83% and 78% of NAA effect, respectively; b) the bulblet diameter compared to NAA; and c) the bulblet survival due to the promotion of antioxidant activity measured as catalase, ascorbate peroxidase, and glutathione reductase...
Tipo: Journal article
Palavras-chave: Ascorbate peroxidase; Bioactive substances; Bulb regeneration; Catalase; Cyanobacteria; Glutathione reductase; Lilium alexandrae; Scytonema hofmanni.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300007

Bioactivity of Tepa (Laureliopsis philippiana (Looser) Shodde) Powder to Sitophilus zeamais Motschulsky Control in Laboratory
Provedor de dados: 117
Autores: Ortiz U,Ana; Silva A,Gonzalo; Urbina P,Angélica; Zapata S.M,Nelson; Rodríguez M,J. Concepción; Lagunes T,Angel.
The maize weevil (Sitophilus zeamais Motschulsky) is one of the most widespread pests and causes heavy losses of stored grain throughout the world. Control of this insect is primarily dependent upon continued applications of organophosphorus and pyrethroid insecticides and fumigants as phosphine but the increasing problems with current insecticides drive the need for research and to develop new control methods. The insecticidal effect of leaf powder of tepa, Laureliopsis philippiana (Looser) Shodde, was evaluated against maize weevil under laboratory conditions. The parameters evaluated were adult mortality and emergence, grain weight loss and germination, and residual, repellent and fumigant effect. The highest levels of insect mortality were registered...
Tipo: Journal article
Palavras-chave: Stored grains; Botanical insecticides; Maize weevil.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100011

Bioacumulación de hidrocarburos aromáticos policíclicos en Anadara tuberculosa (Sowerby, 1833) (Arcoida: Arcidae)
Provedor de dados: 72
Autores: Zambrano,Mónica; Casanova,Robinson; Prada,Jorge; Arencibia,Gustavo; Vidal,Alexis; Capetillo,Norberto.
Se realizaron tres pruebas de bioacumulación exponiendo moluscos bivalvos de la especie Anadara tuberculosa a concentraciones de naftaleno (100,00 ppb), fluoranteno (100,00 ppb) y de una mezcla de los 16 hidrocarburos aromáticos policíclicos (HAP) (15,48 ppb) considerados contaminantes prioritarios por la Environmental Protection Agency (US EPA). La menor incorporación se registró en el grupo de organismos expuestos al naftaleno con 3,40 ppb, nivel inferior al registrado en organismos expuestos a la misma concentración de fluoranteno que alcanzaron 101,13 x 10(4) ppb y a 4,80 x 10³ ppb incorporados en el grupo expuesto a una muy inferior concentración de la mezcla de HAP.
Tipo: Journal article
Palavras-chave: Anadara tuberculosa; Bioacumulación; Hidrocarburos Aromáticos Policíclicos (HAP).
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000200001

Bioaugmentation of latex rubber sheet wastewater treatment with stimulated indigenous purple nonsulfur bacteria by fermented pineapple extract
Provedor de dados: 69
Autores: Kornochalert,Nastee; Kantachote,Duangporn; Chaiprapat,Sumate; Techkarnjanaruk,Somkiet.
Background Treating latex rubber sheet wastewater often leads to the generation of a rotten-egg odor from toxic H2S. To increase the treatment efficiency and eliminate H2S, purple nonsulfur bacteria (PNSB), prepared by supplementing non-sterile rubber sheet wastewater (RAW) with fermented pineapple extract (FPE), were used to treat this wastewater under microaerobic light conditions. The following 3 independent variables: chemical oxygen demand (COD), initial pH and FPE dose were investigated using the Box-Behnken design to find optimal conditions for stimulating the growth of indigenous PNSB (PNSBsi). Results The addition of 2.0% FPE into RAW, which had a COD of 2000 mg L- 1 and an initial pH of 7.0, significantly decreased oxidation reduction potential...
Tipo: Journal article
Palavras-chave: Bioremediation; Fermented plant extract; Response surface methodology; Rotten-egg odor; Rubber wastewater.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000400006

Bioavailability of different methionine sources for broilers from 1 to 21 days old
Provedor de dados: 118
Autores: Sangali,Cleiton P; Bruno,Luís D. G; Nunes,Ricardo V; Neto,Adhemar R. de Oliveira; Pozza,Paulo C; Henz,Jefferson R; Giacobbo,Franciele C. N; Berwanger,Eveline.
This trial aimed to evaluate the bioavailability of DL-2-hydroxy-4-(methyl) butanoic acid (DL-HMBA) and a poly-herbal ingredient (PHI) in relation to DL-methionine (DLM) on broilers. A sample of 1100 broiler chickens of the Cobb 500 strain, both male and female, were fed either a basal diet without industrial methionine supplementation or a basal diet that was supplemented with three DL-HMBA levels (0.170, 0.340, and 0.511%) or three DLM levels (0.111, 0.221, and 0.332%) in an amount equivalent to 65% of the respective DL-HMBA levels (on a product weight basis) and three levels of PHI (0.111, 0.221, and 0.332%) in amounts equivalent to the used DLM levels from 1 to 21 days of age. The simultaneous linear regression analysis (slope ratio) revealed a...
Tipo: Journal article
Palavras-chave: Dl-2-hydroxy-4-methylthio butanoic acid; Dl-methionine; Poly-herbal ingredient; Sulfur amino acids.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000100004

Bioavailability of Phosphorus and Micronutrients in the Soil-Plant-Microbe Continuum
Provedor de dados: 127
Autores: Rengel,Z.
Tipo: Journal article
Palavras-chave: Phosphorus; Micronutrients.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000400013

Biocatalytic oxidative kinetic resolution of (±)-4-(chlorophenyl)phenylmethanol by Nocardia corallina B-276
Provedor de dados: 69
Autores: Ramírez,Mario A.; Pérez,Herminia I.; Manjarrez,Norberto; Solís,Aida; Luna,Héctor; Cassani,Julia.
Chiral diarylmethanols are versatile building blocks for the preparation of biologically active substances, but they are difficult to obtain in enantiopure form. We used Nocardia corallina B-276 for the oxidative kinetic resolution of (±)-4-(chlorophenyl)phenylmethanol, 1. Two experimental methods were used: 1) Suspension of cells in a phosphate buffer solution and 2) Cells in the culture media, in a 3-L bioreactor. After 36 hrs using the first method, the ketone/alcohol ratio was 56/44 and the unoxidized alcohol had an enantiomeric ratio of 93/7, predominating the R-alcohol.
Tipo: Journal article
Palavras-chave: 4-chlorobenzophenone; Biocatalysis; Microbial oxidation; Resolution.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400002

Biochemical Analysis by Calcium Determination on the Newly Formed Bone in Critical Bone Defects Submitted to Different Treatments: A Pilot Study
Provedor de dados: 77
Autores: Issa,Joao Paulo Mardegan; Petenusci,Sergio Olavo; Siéssere,Selma; Regalo,Simone Cecilio Hallak; Lopes,Ruberval Armando; Di Matteo,Miguel Ángel Sala; Iyomasa,Mamie Mizusaki; Defino,Helton Luiz Aparecido.
The aim of this study was to evaluate the calcium dosage of the newly formed bone, in critical bone defects created on the calvarial tissue and filled by different substances, in male Wistar rats. A cylindrical critical bone defect (6x2mm) was created in the posterior portion, left side, on the calvarial bone in nine animals and filled with: animals' coagulum, monoolein gel, poloxamer gel, monoolein gel + 1µg rhBMP-2, monoolein gel + 3µg rhBMP-2, monoolein gel + 7µg rhBMP-2, poloxamer gel + 1µg rhBMP-2, poloxamer gel + 3µg rhBMP-2, poloxamer gel + 7µg rhBMP-2. The results of this study showed a positive correlation between the calcium dosage analysis and the newly formed bone
Tipo: Journal article
Palavras-chave: Bone repair; Biomaterials; RhBMP-2; Carriers; Calcium.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300006

Biochemical and Mitochondrial Changes Induced by Cd, Fe and Zn in Limnodrillus hoffmeisteri
Provedor de dados: 77
Autores: Grajeda y Ortega,María de los Angeles; Ortiz Ordoñez,Esperanza; Favari,Liliana; Shibayama,Mineko; Silva Olivares,Angélica; López López,Eugenia.
The effects of sublethal concentrations of cadmium (0.64 µg/L), iron (0.043 mg/L) and zinc (0.31 mg/L) and a mixture of these metals on succinate dehydrogenase (SD) and alkaline phosphatase (AP) activity and on structural changes in the mitochondria of epithelium cells of the digestive tract were examined in the oligochaete Limnodrillus hoffmeisteri after 96 h of exposure in artificial sediments. SD activity was significantly inhibited, particularly in treatments with Cd alone (92.57%), while AP increased its activity with Cd alone (73.23%). However, when this metal was mixed with Fe and Zn, the inhibition of SD activity was lower (67.82%) than with Cd alone, showing an antagonistic effect and AP increased its activity (73.26%). Mitochondria were...
Tipo: Journal article
Palavras-chave: Heavy metals; Mixture; Alkaline phosphatase; Succinate dehydrogenase activity; Limnodrillus hoffmeisteri; Epithelium cells; Mitochondria.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200018

Biochemical characterization and inhibitory effects of dinophysistoxin-1, okadaic acid and microcystine l-r on protein phosphatase 2a purified from the mussel Mytilus chilensis.
Provedor de dados: 48
Autores: RIVAS,MARIELLA; GARCÍA,CARLOS; LIBERONA,JOSÉ L; LAGOS,NÉSTOR.
Protein phosphatases are involved in many cellular processes. One of the most abundant and best studied members of this class is protein phosphatase type-2A (PP2A). In this study, PP2A was purified from the mussel Mytilus chilensis. Using both SDS-PAGE and size exclusion gel filtration under denaturant conditions, it was confirmed that the PP2A fraction was essentially pure. The isolated enzyme is a heterodimer and the molecular estimated masses of the subunits are 62 and 28 kDa. The isolated PP2A fraction has a notably high p-NPP phosphatase activity, which is inhibited by NaCl. The hydrolytic p-NPP phosphatase activity is independent of the MgCl2 concentration. The time courses of the inhibition of the PP2A activity of p-NPP hydrolysis by increasing...
Tipo: Journal article
Palavras-chave: Chile; Diarrhetic Shellfish Poisoning (DSP); Mussel; Mytilus chilensis; Protein Phosphatase 2A; Microcystine L-R.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000300005

Biochemical Profile of Serbian Youth National Soccer Teams
Provedor de dados: 77
Autores: Joksimovic,Aleksandar; Jezdimirovic,Marko; Smajic,Miroslav; Stankovic,Daniel; Popovic,Stevo; Tomic,Bogdan.
The aim of the present study was to determine biochemical profile of youth national soccer teams and to compare the values of nine biochemical parameters between three Serbian youth national teams (under 14, 15 and 16 years old), as well as between soccer players and non-athletes. Eighty young soccer players and thirty non-athletes participated in the study. Nine biochemical parameters (glucose, cholesterol, triglycerides, urea, creatinine, total bilirubin, AST (SGOT), ALT (SGPT), iron) were measured. In order to determine the significance of differences between the groups on a multivariate level a multivariate analysis of variance (MANOVA) was administered, and to test the differences between the groups on an univariate level a univariate analysis of...
Tipo: Journal article
Palavras-chave: Biochemical parameters; Selection; Differences; Youth soccer.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200013

BIOCHEMICAL PROPERTIES IN VASCULAR EPIPHYTES SUBSTRATE FROM A TEMPERATE FOREST OF CHILE
Provedor de dados: 127
Autores: Reyes,Francisco; Silvana,Zanetti; Espinosa,Alejandro; Marysol,Alvear.
The temperate forests of south-central Chile belong to the association Lapageria aextoxiconetum Oberdorfer vegetation, dominated by Aextoxicon punctatum R. et P., elderly and multi-layered, where the strata are emergent, dominant and co-dominant, shrub and herbaceous epiphytes. This work is the first report of measurements of some biochemical properties in samples from vascular epiphytes substrate in temperate forests. We evaluated the most frequent ecological situations: bifurcated trees (BT), dead standing trees (SDT) and medium gap border trees (MGBT), ES were compared with the surrounding soil forest land (SS) as control. The microbial biomass and enzyme activities of substrate were higher in ES of BT, situation probably due to optimal...
Tipo: Journal article
Palavras-chave: Vascular epiphytes substrate; Enzymatic activities; Temperate forest.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000200004

Biochemical properties of an extracellular &amp;#946;-D-fructofuranosidase II produced by Aspergillus phoenicis under Solid-Sate Fermentation using soy bran as substrate
Provedor de dados: 69
Autores: Rustiguel,Cynthia Barbosa; Oliveira,Arthur Henrique Cavalcanti de; Terenzi,Héctor Francisco; Jorge,João Atílio; Guimarães,Luis Henrique Souza.
The filamentous fungus A. phoenicis produced high levels of ?-D-fructofuranosidase (FFase) when grown for 72 hrs under Solid-State Fermentation (SSF), using soy bran moistened with tap water (1:0.5 w/v) as substrate/carbon source. Two isoforms (I and II) were obtained, and FFase II was purified 18-fold to apparent homogeneity with 14% recovery. The native molecular mass of the glycoprotein (12% of carbohydrate content) was 158.5 kDa with two subunits of 85 kDa estimated by SDS-PAGE. Optima of temperature and pH were 55Ã¯Â¿Â½C and 4.5. The enzyme was stable for more than 1 hr at 50Ã¯Â¿Â½C and was also stable in a pH range from 7.0 to 8.0. FFase II retained 80% of activity after storage at 4Ã¯Â¿Â½C by 200 hrs. Dichroism analysis showed the presence of random...
Tipo: Journal article
Palavras-chave: Agroindustrial substrate; Aspergillus; ?-D-fructofuranosidase; Solid state fermentation; Sucrose.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200002

Biocidal activity of partially purified fractions from methanolic extract of Garcinia kola (Heckel) seeds on bacterial isolates
Provedor de dados: 48
Autores: AKINPELU,DA; ADEGBOYE,MF; ADELOYE,OA; OKOH,AI.
The in vitro antibacterial activity of crude methanolic extract of the seeds of Garcinia kola was investigated. The extracts exhibited antibacterial activities with zones of inhibition ranging from 10 mm to 25 mm. The minimum inhibitory concentration of the diethyl ether fraction was between 0.313 and 5.0 mg/ml, while that of butanol fraction varied from 0.157 to 5.0 mg/ml. The butanol fraction killed about 77% of Bacillus anthracis and 79% of Escherichia coli cells within 120 min at a concentration of 5.0 mg/ml. Protein leakage from the B. anthracis and E. coli cells when exposed to the butanol and diethyl ether fractions was observed. We conclude that Garcinia kola seed extract has a broad spectrum antibacterial activity, with the butanol and diethyl...
Tipo: Journal article
Palavras-chave: Garcinia kola; Antimicrobial activity; MIC; Killing rate; Protein leakage.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000300005

Biocompatibilidad de Células Madres Mesenquimales de Tejido Gingival Humano en Cultivoconun Andamiaje de Polímero Sintético de Ácido Poliláctico (OPLA)
Provedor de dados: 77
Autores: Brizuela Cordero,Claudia; Saint Jean,Nicole; Inostroza Silva,Carolina.
La ingeniería tisular se plantea como tratamiento ideal para la regeneración de tejidos con la utilización de andamiajes, células madres y factores de crecimiento. Las células madres de origen gingival plantean ventajas de obtención, mientras que el OPLA 3D permite cultivos de alta densidad celular. El objetivo de esta investigación fue evaluar la biocompatibilidad de células madres de origen gingival en OPLA. Las células se obtuvieron de tejido gingival y fueron caracterizadas fenotípica y funcionalmente. La biocompatibilidad se evaluó mediante la proliferación celular, prueba de viabilidad con azul tripán y diferenciación celular a linaje condrogénico y osteogénico. El recultivo del constructo se utilizó para evaluar la capacidad de transporte. Las...
Tipo: Journal article
Palavras-chave: Células madre mesenquimales; Tejido conectivo gingival; Biocompatibilidad.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300004

Biocompatibility of Human Auricular Chondrocytes Cultured onto a Chitosan/Polyvynil Alcohol/Epichlorohydrin-Based Hydrogel for Tissue Engineering Application
Provedor de dados: 77
Autores: Melgarejo-Ramírez,Yaaziel; Sánchez-Sánchez,Roberto; García-Carvajal,Zaira; García-López,Julieta; Gutiérrez-Gómez,Claudia; Luna-Barcenas,Gabriel; Ibarra,Clemente; Velasquillo,Cristina.
Tissue engineering (TE) has become an alternative for auricular reconstruction based on the combination of cells, molecular signals and biomaterials. Scaffolds are biomaterials that provide structural support for cell attachment and subsequent tissue development. Ideally, a scaffold should have characteristics such as biocompatibility and bioactivity to adequate support cell functions. Our purpose was to evaluate biocompatibility of microtic auricular chondrocytes seeded onto a chitosan-polyvinyl alcohol-epichlorohydrin (CS-PVA-ECH) hydrogel to propose this material as a scaffold for tissue engineering application. After being cultured onto CS-PVA-ECH hydrogels, auricular chondrocytes viability was up to 81%. SEM analysis showed cell attachment and...
Tipo: Journal article
Palavras-chave: Elastic cartilage; Auricular reconstruction; Chitosan hydrogel; Tissue engineering; Biocompatibility.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400036

Biocontrol capacity of wild and mutant Trichoderma harzianum (Rifai) strains on Rhizoctonia solani 618: effect of temperature and soil type during storage
Provedor de dados: 69
Autores: Montealegre,Jaime; Valderrama,Luis; Herrera,Rodrigo; Besoaín,Ximena; Pérez,Luz M.
Wild (Th11, Th12 and Th650) and mutant (Th11A80.1, Th12A40.1, Th12C40.1 and Th650-NG7) Trichoderma harzianum strains were stored for 180 days at 5ºC or at 22ºC, in two types of soils. Strains recovered at 90, 120 and 180 days from the two types of soils, retained their full capacity to biocontrol Rhizoctonia solani 618, that produces crown and root rot of tomatoes. Recovery, estimated as colony forming units (cfu) of the wild and mutant strains, showed that all increased their cfu after storage independently of the type of soil and temperature, although kinetic behavior differed among strains. Ratios of recovery after storage in type B soil/ type A soil or at 22ºC/5ºC, higher or lower than one respectively, allowed to establish that Th11 and Th12 were the...
Tipo: Journal article
Palavras-chave: Bioantagonism; Persistence; Root rot; Tomato.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400002

Biocontrol of root and crown rot in tomatoes under greenhouse conditions using Trichoderma harzianum and Paenibacillus lentimorbus: Additional effect of solarization
Provedor de dados: 69
Autores: Montealegre,Jaime R; Herrera,Rodrigo; Velásquez,Juan Carlos; Silva,Polyana; Besoaín,Ximena; Pérez,Luz María.
Trichoderma harzianum 650 (Th650) and Paenebacillus lentimorbus 629 (Pl629) selected earlier for their ability to control Rhizoctonia solani, Fusarium solani and F. oxysporum in vitro, were applied alone or combined with solarization (summer assay) and/or with methyl bromide (MeBr) (summer and winter assays) to a soil with a high inoculum level, for the control of tomato root rot caused by the complex F. oxysporum f. sp. lycopersici - Pyrenochaeta lycopersici - Rhizoctonia solani. Evaluations were also performed independently for root damage caused by P. lycopersici, and also for R. solani in the summer assay. MeBr decreased tomato root damage caused by the complex from 88.7% to 21.2% and from 78.4% to 35.7% in the summer and in the winter assay,...
Tipo: Journal article
Palavras-chave: Fusarium oxysporum; Lycopersicon esculentum; Pyrenochaeta lycopersici; Rhizoctonia solani; Solarization.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300004

Bioconversion and saccharification of some lignocellulosic wastes by Aspergillus oryzae ITCC-4857.01 for fermentable sugar production
Provedor de dados: 69
Autores: Begum,Most. Ferdousi; Alimon,Abdul Razak.
The recent interest in bioconversion of agricultural and industrial wastes to chemical feedstock has led to extensive studies on cellulolytic enzymes produced by microorganisms. In the present study three lignocellulosic substrates viz. sugarcane bagasse, sawdust and water hyacinth were pre-treated with alkali and enzyme and their effect on bioconversion has been investigated. The ability of selected substrates for induction of cellulase enzyme by A. oryzae ITCC 4857.01 and for the potentiality of the induced enzyme to saccharify the substrates were also assessed. The maximum degree of conversion of substrate (0.415%) and improved specific substrate consumption (0.99 g substrate/g dry biomass) was exhibited in sugarcane bagasse after alkali treatment at 96...
Tipo: Journal article
Palavras-chave: Aspergillus oryzae; Biomass; Cellulase; Lignocellulosic substrates; Pre-treatment; Saccharification.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500003

Bioconversion of agro-industrial wastes for the production of fibrinolytic enzyme from Bacillus halodurans IND18: Purification and biochemical characterization
Provedor de dados: 69
Autores: Vijayaraghavan,Ponnuswamy; Prakash Vincenta,Samuel Gnana; Valan Arasu,Mariadhas; Al-Dhabi,Naif Abdullah.
Background: Agro-wastes were used for the production of fibrinolytic enzyme in solid-state fermentation. The process parameters were optimized to enhance the production of fibrinolytic enzyme from Bacillus halodurans IND18 by statistical approach. The fibrinolytic enzyme was purified, and the properties were studied. Results: A two-level full factorial design was used to screen the significant factors. The factors such as moisture, pH, and peptone were significantly affected enzyme production and these three factors were selected for further optimization using central composite design. The optimum medium for fibrinolytic enzyme production was wheat bran medium containing 1% peptone and 80% moisture with pH 8.32. Under these optimized conditions, the...
Tipo: Journal article
Palavras-chave: Agro-residues; Solid-state fermentation; Statistical approach; Thrombolytic agent.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000200001

Bioconversion of (+)- and (-)-alpha-pinene to (+)- and (-)-verbenone by plant cell cultures of Psychotria brachyceras and Rauvolfia sellowii
Provedor de dados: 69
Autores: Limberger,Renata Pereira; Aleixo,Adriana Mendes; Fett-Neto,Arthur Germano; Henriques,Amélia T.
This work describes the bioconversion of (-)- and (+)-alpha-pinene (2,6,6-trimethyl-bicyclo[3.1.1]hept-2-ene), targeted at the production of (-)- and (+)-verbenone (4,6,6-trimethyl-bicyclo (3.1.1) hept-3-en-2-one), respectively, using Psychotria brachyceras and Rauvolfia sellowii cell suspension cultures. P. brachyceras showed selectivity to (-)-alpha-pinene with 80.9% conversion (relative integrated area gas chromatography-mass spectrometry (GC-MS)) of (-)-verbenone in 10-day-incubation, whereas R. sellowii was able to convert both pinene enantiomers (37.6% conversion of (-)-verbenone in 7-day-incubation and 32.2% conversion of (+)-verbenone in 10-day-incubation). In both systems trans-verbenol was formed as main product and then slowly biocatalyzed to...
Tipo: Journal article
Palavras-chave: Alpha-pinene; Biotransformation; Verbenol; Verbenone.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400003

Bioconversion of apple pomace into a multienzyme bio-feed by two mixed strains of Aspergillus niger in solid state fermentation
Provedor de dados: 69
Autores: Zhong-Tao,Sun; Lin-Mao,Tian; Cheng,Liu; Jin-Hua,Du.
Apple pomace is a wasted resource produced in large quantities and its deposit has caused serious environmental problems, so it is significance to make the full utilization of the residues. The objectives of this work were to produce multienzyme bio-feed, biodegrade the anti-nutritional factors such as pectin and tannins in apple pomace, and obtain the nutritional enrichment of the fermented substrate. The mixture of apple pomace and cottonseed powder (1:1, w/w), supplemented with 1% (w/w) (NH4)2SO4 and 0.1% (w/w) KH2PO4, was proved to be the optimum medium for the mixed strains of Aspergillus niger M2 and M3 (2:1, w/w). The activities of pectinase, proteinase and cellulase achieved 21168 u/g, 3585 u/g and 1208u/g, and the biodegradation rates of pectin...
Tipo: Journal article
Palavras-chave: Apple pomace; Aspergillus niger; Multienzyme bio-feed; Pectin; Solid state fermentation; Tannins.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000100002

Bioconversion of cassava starch by-product into Bacillus and related bacteria polyhydroxyalkanoates
Provedor de dados: 69
Autores: Krueger,Cristhiane L; Radetski,Claudemir M; Bendia,Amanda G; Oliveira,Ida M; Castro-Silva,Marcus A; Rambo,Carlos R; Antonio,Regina V; Lima,André O.S.
Background: Unlike petroleum-based synthetic plastics, biodegradable biopolymer generation from industrial residue is a key strategy to reduce costs in the production process, as well as in the waste management, since efficient industrial wastewater treatment could be costly. In this context, the present work describes the prospection and use of bacterial strains capable to bioconvert cassava starch by-product into biodegradable polyhydroxyalkanoates (PHAs). Results: The first step of this study was the bacterial competence screening which was conducted with 72 strains covering 21 Bacillus and related species. The microorganism growth in a medium with a starch substrate was measured by an innovative MTT assay, while the ability of the bacteria to secrete...
Tipo: Journal article
Palavras-chave: Bacillus megaterium; Biodegradable plastics; Biopolymer; MTT assay; Starch substrates.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300008

Bioconversion of mixed free fatty acids to poly-3-hydroxyalkanoates by Pseudomonas putida BET001 and modeling of its fermentation in shake flasks
Provedor de dados: 69
Autores: Makhdum Munawar,Khalil Munawar; Simarani,Khanom; Annuar,Mohamad Suffian Mohamad.
Background: The paper reports on the utilization of palm kernel oil (PKO) as a low cost renewable substrate for medium-chain-length poly-3-hydroxyalkanoates (mcl-PHA) production by Pseudomonas putida BET001. Investigation on the effects of selected key variables on growth, mixed free fatty acids consumption and mcl-PHA production by the bacterial culture in the shaken flask system were carried out along with its kinetic modeling. Results: The biomass production, fatty acids consumption and mcl-PHA production were found favorable when the strain was cultured in mineral medium at pH 6-7,28°C, aeration surface-to-volume ratio of 0.4 x 10(6) m-1, 250 rpm agitation rate for 48 h. Mcl-PHA production by this strain showed mixed growth and non-growth associated...
Tipo: Journal article
Palavras-chave: Biopolymer; Fermentation; Medium-chain-length PHA; Palm kernel oil; Pseudomonas putida.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100008

Biodegradation kinetics of o-cresol by Pseudomonas putida DSM 548 (pJP4) and o-cresol removal in a batch-recirculation bioreactor system
Provedor de dados: 69
Autores: Kaymaz,Yasin; Babaoglu,Anil; Pazarlioglu,Nurdan Kasikara.
The biodegradation kinetics of o-cresol was examined by acclimatized P. putida DSM 548 (pJP4) in batch experiments at varying initial o-cresol concentrations (from 50 to 500 mg/L). The kinetic parameters of o-cresol aerobic biodegradation were estimated by using the Haldane substrate inhibition equation. The biodegradation kinetics of o-cresol was investigated. In batch culture reactors, the Maximum specific growth rate (&amp;#956;max), Monod constant (Ks) and the inhibition constant (Ki) were established as 0.519 h-1, 223.84 mg/L and 130.883 mg/L, respectively. o-cresol biodegradation in a batch-recirculation bioreactor system by immobilized P. putida was also studied. The recycled packed bed reactor system, which was composed of Ca-alginate beads and...
Tipo: Journal article
Palavras-chave: Biodegradation; Cell immobilization; O-cresol; Pseudomonas putida; Substrate inhibition kinetics.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100003

Biodegradation of a blended starch/natural rubber foam biopolymer and rubber gloves by Streptomyces coelicolor CH13
Provedor de dados: 69
Autores: Watcharakul,Sirimaporn; Umsakul,Kamontam; Hodgson,Brian; Chumeka,Wannapa; Tanrattanakul,Varaporn.
Background: The growing problem of environmental pollution caused by synthetic plastics has led to the search for alternative materials such as biodegradable plastics. Of the biopolymers presently under development, starch/natural rubber is one promising alternative. Several species of bacteria and fungi are capable of degrading natural rubber and many can degrade starch. Results: Streptomyces coelicolor CH13 was isolated from soil according to its ability to produce translucent halos on a mineral salts medium, MSM, supplemented with natural rubber and to degrade starch. Scanning electron microscope studies showed that it colonized the surfaces of strips of a new starch/natural rubber biopolymer and rubber gloves and caused degradation by forming holes,...
Tipo: Journal article
Palavras-chave: Biodegradation; Biopolymer; Natural rubber; Starch; Streptomyces coelicolor.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100008

Biodegradation of agroindustrial wastes by Pleurotus spp for its use as ruminant feed
Provedor de dados: 69
Autores: Alborés,Silvana; Pianzzola,María Julia; Soubes,Matilde; Cerdeiras,María Pía.
The increasing expansion of agro-industrial activity has led to the accumulation of a large quantity of lignocellulosic residues all over the world. In particular, large quantities of rice straw (300.000 t) and citric bagasse (50.000 t) are annually produced in Uruguay. In this work we present the study of the bioconversion of these substrates with the edible mushroom Pleurotus spp so as to increase nutritional values and digestibility for its use as animal feed. The SSF process was optimized and the products after different periods of mushroom growth were evaluated. The microbial counts (cfu/g) for the inoculated substrates 44 days after incubation were 15 x 10(4), &lt; 10 and &lt; 10 for aerobic microorganisms, coliforms and E. coli, respectively. After...
Tipo: Journal article
Palavras-chave: Agroindustry; Basidiomycetes; Ruminant feed.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300008

Biodegradation of deproteinized potato wastewater and glycerol during cultivation of Rhodotorula glutinis yeast
Provedor de dados: 69
Autores: Kot,Anna Maria; Blazejak,Stanislaw; Kurcz,Agnieszka; Gientka,Iwona.
Background Deproteinized potato wastewater and glycerol are two by-products which are difficult to dispose. The objective of this study was to determine the ability of Rhodotorula glutinis to use glycerol and nitrogen compounds present in deproteinized potato wastewater and to evaluate the ability of simultaneous biodegradation of potato wastewater and glycerol via microbiological methods. Results It has been found that R. glutinis used glycerol and potato wastewater as a source of carbon and nitrogen, respectively. The highest degree of glycerol content (70.6%) reduction was found after cultivation of the investigated strain using a medium with 5% glycerol. In this medium, a significant reduction in the total protein content, estimated at 61%, was...
Tipo: Journal article
Palavras-chave: Biodegradation; Chemical oxygen demand; Industrial waste; Rhodotorula.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600007

Biodegradation of natural phenolic compounds as single and mixed substrates by Fusarium flocciferum
Provedor de dados: 69
Autores: Mendonça,Elsa; Martins,Aida; Anselmo,Ana Maria.
The mycelium of Fusarium flocciferum was assayed for its ability to degrade aromatic compounds, namely, gallic, protocatechuic, vanillic, syringic, caffeic, and ferulic acids and syringic aldehyde, commonly found in agro-industrial wastes. The biodegradation assays were performed in liquid medium with the phenolic compounds as single substrates and as a synthetic mixture containing the seven aromatic compounds. The results with single substrates indicated that in 24 hrs of incubation the fungus was able to reduce the phenolic concentration from 200 mg/l to below detection limits, except for syringic acid, being the lowest degradation rates found for this acid and its aldehyde. The biodegradation experiments with the mixture of phenolic compounds showed...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100005

Biodegradation of two commercial herbicides (Gramoxone and Matancha) by the bacteria Pseudomonas putida
Provedor de dados: 69
Autores: Kopytko,Maria; Chalela,Graciela; Zauscher,Fernando.
The purpose of this project was to evaluate the biodegradation of two commercial herbicides (Gramoxone and Matancha) by the bacteria Pseudomonas putida. Gramoxone’s active ingredient is Paraquat (1,1’-dimethyl-4,4’-bipyridylium) and Matancha’s is 2,4-D (2,4-dichlorophenoxiacetic acid). To carry out the biodegradation experiments, a factorial design 2³ was executed, where the independent variables were: herbicide concentration, nutrient concentration and the use or no use of activated charcoal (AC) in the same experiment with bacteria. Duplicate experiments were performed for a period of three days using 500 ml bioreactors. The best results obtained when no AC was used were: 47,29% degradation for Gramoxone (by UV/VIS) and 68.72% for Matancha (by HPLC). The...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200013

Biodeterioration patterns found in dammar resin used as art material
Provedor de dados: 69
Autores: Romero-Noguera,Julio; Martín-Sánchez,Inés; López-Miras,María del Mar; Ramos-López,José Miguel; Bolívar-Galiano,Fernando.
Since the middle of the XIX century, when dammar became popular in Occident, this natural resin is one of the most used in art painting techniques as final protective coating (varnish) as well as a component of pictorial media. The present work is the first approach to the study of the microbiological biodeterioration of this artistic material, which can seriously affect the appearance and integrity of works of art when bad conservation conditions -especially high humidity levels- take place. 12 microorganisms, fungi and bacteria, came from collection and from oil paintings affected by biodeterioration patterns, were inoculated on test specimens prepared with varnish dammar. These were incubated and analyzed by GC-MS to determine both the microbiological...
Tipo: Journal article
Palavras-chave: Bacteria; Biodeterioration; Dammar; Fungi; GC-MS.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300006

Biodiversidad del complejo de artrópodos asociados al follaje de la vegetación del norte de Chile, II región
Provedor de dados: 97
Autores: SAIZ,FRANCISCO; YATES,LESLIE; NUÑEZ,CARLOS; DAZA,MYRIAM; VARAS,MARIA E; VIVAR,CARLOS.
Uno de los componentes principales de la biodiversidad de los ecosistemas corresponde al complejo plantas hospederas, fitófagos y organismos que regulan a las poblaciones de fitófagos. El conocimiento de este complejo en la región árida de Chile es escaso, situación que motiva la presente investigación. Como hipótesis se plantea que a más favorables condiciones ambientales, a mayor diversidad de plantas hospederas y a mayor contenido de nitrógeno y de agua en los vegetales se sustentará una mayor biodiversidad de fitófagos, los que, a su vez, sustentarán mayor diversidad de depredadores y de parasitoides. El estudio se realizó en la II Región del país, mediante un transecto longitudinal, desde la Costa a la Cordillera de los Andes, el que cruza las...
Tipo: Journal article
Palavras-chave: Biodiversidad; Artrópodos; Follaje; Zona árida; Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400011

Biodiversidad en Ambientes Fragmentados de Chile: Patrones y Procesos a Diferentes Escalas
Provedor de dados: 118
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000200009

Biodiversidad y colecciones científicas
Provedor de dados: 97
Autores: RAU,JAIME R.
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000300001

Biodiversidad y estructura comunitaria de ríos en las zonas árida, semiárida y mediterránea-norte de Chile
Provedor de dados: 97
Autores: PALMA,ALEJANDRO; GONZÁLEZ-BARRIENTOS,JAVIER; REYES,CLAUDIO A; RAMOS-JILIBERTO,RODRIGO.
En este trabajo se recopila y analiza la información disponible contenida en estudios científicos y técnicos a fin de determinar la composición taxonómica y la estructura trófica de comunidades de ríos pertenecientes a cinco cuencas hidrográficas de Chile, ubicadas en un gradiente ambiental árido-mediterráneo. Las cuencas fueron: Loa, Huasco, Limarí, Cachapoal y Mataquito. Se consideraron los cuatro grupos taxonómicos más importantes: peces, macroinvertebrados bentónicos, macrófitas y diatomeas bentónicas. Se logró determinar la estructura taxonómica y trófica para 10 comunidades pertenecientes a las cuencas estudiadas. Los análisis indicaron que: (a) cada cuenca muestra una estructura taxonómica característica; (b) no se aprecian patrones de aumento o...
Tipo: Journal article
Palavras-chave: Ecología acuática; Ecosistemas lóticos; Grupo funcional; Limnología; Redes tróficas.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000100001

Bio-Economic and Qualitative Impact of Reduced Herbicide use in Direct Seeded Fine Rice Through Multipurpose Tree Water Extracts
Provedor de dados: 117
Autores: Khaliq,Abdul; Matloob,Amar; Riaz,Yasir.
Weed control program should be environmentally benign and cost-effective so that reduced herbicide use can help meet these goals. Field trials were conducted to assess the bio-economic and qualitative impact of reduced doses (25 and 50% of label dose) of a postemergence pyrimidinyloxybenzoic acid herbicide (bispyribac-sodium) applied alone or in combination with multipurpose tree (eucalyptus Eucalyptus camaldulensis Dehnh., mango Mangifera indica L., and mulberry Morus alba L.) water extracts in direct seeded rice (Oryza sativa L.) fields. The label dose of bispyribac-sodium and penoxsulam along with weed control were included for comparison. Tank mixing of multipurpose tree water extracts with reduced herbicide doses accounted for &gt; 55% suppression in...
Tipo: Journal article
Palavras-chave: Reduced dose; Weed suppression; Yield; Kernel quality; Oryza sativa.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300008

Bioenergy production capacity in the province of Santa Fe, Argentina
Provedor de dados: 118
Autores: Montico,Sergio.
Bioenergy is a renewable source of primary energy and its sustainable use is an advantage to the current global energy crisis. The use of vegetable resources for energy purposes requires specific studies of the impacts that might occur to the economy and the environment. The province of Santa Fe (Argentina) has an agroproductive structure capable of providing biomass for its processing and production of energy. The objective of this work was to value the capacity of this province for bioenergy production from grains transformation into biofuels and the biomass energy from crop straw, and speculates on the impact on soils from removed crop residues. Crop residues of the ten most important grain and oilseed crops (15.2x10(6) Mg year-1) and bioethanol and...
Tipo: Journal article
Palavras-chave: Biofuels; Bioenergy; Crops residues; Sustainability.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300013

BIOENSAYOS DE FITOTOXICIDAD DE RESIDUOS ORGÁNICOS EN LECHUGA Y BALLICA ANUAL REALIZADOS EN UN SUELO ALFISOL DEGRADADO
Provedor de dados: 127
Autores: Celis Hidalgo,José; Sandoval Estrada,Marco; Briones Luengo,Mario.
El propósito de este estudio fue evaluar la fitotoxicidad de distintos residuos orgánicos. Se midió el índice de germinación (IG), la longitud de radícula/hipocotilo de la lechuga y la biomasa de ballica anual en un suelo granítico degradado (Alfisol). Los residuos orgánicos fueron: lodo municipal (LM), lodo de piscicultura salmonídea terrestre (LPT), y lodo de salmonicultura lacustre (LSL). Cinco dosis de estos materiales (lodo/suelo) fueron preparadas: 25, 50, 75,100 y 1501 ha-1. Un control sin adición también fue incluido. Los resultados indicaron que el IG, así como la longitud de radícula y del hipocotilo de la lechuga no se afectaron significativamente cuando la tasa lodo/suelo varió entre 25 a 1001 ha-1. Con respecto a ballica anual, todos los...
Tipo: Journal article
Palavras-chave: Residuos de salmonicultura; Lodo urbano; Fertilizante orgánico; Biosólidos.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000300005

Bioestimulación láser en semillas y plantas
Provedor de dados: 73
Autores: HERNÁNDEZ-AGUILAR,CLAUDIA; DOMÍNGUEZ-PACHECO,ARTURO; CRUZ-OREA,ALFREDO; PODLE&amp;#346;NA,ANNE; IVANOV,RUMEN; CARBALLO CARBALLO,AQUILES; PÉREZ REYES,MARÍA CRISTINA; SÁNCHEZ HERNÁNDEZ,GABRIELA; ZEPEDA BAUTISTA,ROSALBA; LÓPEZ-BONILLA,JOSÉ LUIS.
Diversos láseres han demostrado ser potencialmente útiles a determinados parámetros de irradiación y podrían beneficiar el establecimiento de siembra en condiciones adversas por radiación UV-B, sequía, frío, salinidad, contaminación por cadmio, etc. Esta revisión de literatura científica exhibe las aplicaciones posibles de los láseres en los últimos años, como tratamiento de semillas y plantas, destacando el uso de los láseres de He-Ne, Ar, Neodimio-YAG, CO y los diodos láser. Es evidente que las aplicaciones de láseres a parámetros de irradiación específicos en semillas y plantas han adquirido cada vez mayor importancia debido a la necesidad de incrementar la producción de alimentos a nivel global mediante métodos que protejan el medio ambiente y...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100015

Bioethical aspects of basic research and medical applications of human stem cells
Provedor de dados: 48
Autores: Santos,Manuel J; Ventura-Juncá,Patricio.
The new discoveries, the extraordinary dynamism in human stem cell (SC) research, and the great expectations of the benefits in clinical treatment of many diseases are on the edge of unparalleled advances in both: 1) the understanding of basic mechanisms of cell differentiation and development and 2) the translation from basic research to new clinical therapies. Human stem cells are obtained from different sources, such as embryo, fetal, and adult tissues, in vitro induction (iPS cells) or transdifferentiation. The evidence that these cells are pluripotent (or multipotent), meaning they have the ability to differentiate into all body tissues or tissues of the same lineage, raises the possibility that they could regenerate diseased or damaged tissue in...
Tipo: Journal article
Palavras-chave: Human Stem cells; Basic research; Bioethics; Clinical trials; Translational research.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000300013

Bioethics and animal research: A personal perspective and a note on the contribution of Fritz Jahr
Provedor de dados: 48
Autores: LOLAS,FERNANDO.
Reviewing fundamental aspects of bioethics and outlining the work of the Bioethics Program of the Pan American Health Organization, this paper draws attention to the work of a forgotten pioneer- Fritz Jahr- who coined the term bioethics in 1927 and anticipated many of the arguments and discussions now current in biological research involving animals
Tipo: Journal article
Palavras-chave: Bioethics; Biological research; Pan American Health Organization; Fritz Jahr.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000100013

Biofilm formation and acyl homoserine lactone production in Hafnia alvei isolated from raw milk
Provedor de dados: 48
Autores: SOUZA VIANA,ELISETH; MARTINO CAMPOS,MARIA EMILENE; REIS PONCE,ADRIANA; CUQUETTO MANTOVANI,HILÁRIO; DANTAS VANETTI,MARIA CRISTINA.
The objective of this study was to detect the presence of acyl homoserine lactones (AHLs), signal molecules of the quorum sensing system in biofilm formed by Hafnia alvei strains. It also evaluated the effect of synthetic quorum sensing inhibitors in biofilm formation. AHLs were assayed using well diffusion techniques, thin layer chromatography (TLC) and detection directly in biofilm with biomonitors. The extracts obtained from planktonic and sessile cell of H. alvei induced at least two of three monitor strains evaluated. The presence of AHLs with up to six carbon atoms was confirmed by TLC. Biofilm formation by H. alvei was inhibited by furanone, as demonstrated by 96-well assay of crystal violet in microtitre plates and by scanning electron microscopy....
Tipo: Journal article
Palavras-chave: Acyl homoserines lactones; Biofilm; Furanones; Quorum sensing.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000400004

Biofilm formation for organic matter and sulphate removal in gas-lift reactors
Provedor de dados: 69
Autores: Pizarro,Carolina; Donoso-Bravo,Andrés; Jeison,David; Ruiz-Filippi,Gonzalo; Chamy,Rolando.
A start-up strategy was presented and evaluated to obtain a well-established biofilm in a gas lift-reactor capable both for the removal of organic matter and sulphate. Pumice stone was used as material support. The influence of shear forces, given by the biogas recirculation, the effect of the COD/SO4-2 ratio and the OLRs increase were evaluated on the reactor performance. From the first stages, cell colonization was observed along with the presence of extracellular polymeric substances. The COD and sulphate removal was over 70%, for all conditions. The increase of gas flow did not have an adverse effect on biofilm development even though there was some detachment. Specific methanogenic activity of the biofilm increased along the experiments. Operational...
Tipo: Journal article
Palavras-chave: Anaerobic biofilm; Gas-lift reactors; Sulphate; Start-up.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400003

Biogeochemistry of the OMZ of Chile
Provedor de dados: 72
Autores: Pantoja,Silvio.
Most microbial reactions are in one way or another associated to decomposition of organic matter, and occurs under two general conditions: in the presence and in the absence of oxygen. Here, we will examine current information on the biogeochemical reactions in the area of the oxygen minimum zone off Chile. The aim of this presentation is to examine mechanisms of processing of organic matter under upwelling and O2 depletion.
Tipo: Journal article
Palavras-chave: Microbial reaction; Decomposition; Sinking; DOC.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300013

Biogeografía marina de Chile continental
Provedor de dados: 97
Autores: CAMUS,PATRICIO A.
Por casi un siglo, varios autores han analizado los patrones de distribución de la fauna y flora marina del Pacífico de Sudamérica y de la costa de Chile en particular, con el propósito de establecer el número de las unidades biogeográficas presentes. Si bien los patrones generales actuales son relativamente bien conocidos, la mayoría de los estudios se ha enfocado en las discontinuidades distribucionales y en propuestas de clasificación más que en los factores y procesos dinámicos que han formado las unidades espaciales identificadas. Aun en el caso de las clasificaciones, las conclusiones publicadas se basan principalmente en el análisis de uno o pocos grupos seleccionados, y presentan diferencias importantes en los criterios de selección de los grupos,...
Tipo: Journal article
Palavras-chave: Biota marina; Chile; Clasificación biogeográfica; Dinámica; Eventos tectónicos y glaciales; Provincialización.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300008

Biogeographic analysis and key to the genera of ferns and lycophytes of Mburucuyá National Park, Corrientes, Argentina
Provedor de dados: 97
Autores: MEZA-TORRES,ESTEBAN I; DE LA SOTA,ELÍAS R; FERRUCCI,MARÍA S.
The diversity of ferns and lycophytes of Corrientes province, Argentina is not well understood. Our field work in the Mburucuyá National Park in Corrientes province as well as a literature review finds 29 genera and 48 infrageneric taxa of ferns and lycophytes for this Park. A comparison of the Park's species diversity with other protected areas in northeastern Argentina using Jaccard's similarity coefficient and the infrageneric taxa biodiversity index proposed by Squeo et al. (1998) are analized. A key to the Park's ferns and lycophytes genera is provided.
Tipo: Journal article
Palavras-chave: Floristic diversity; Monilophytes; Protected area; Pteridophytes.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000100005

Biogeographic patterns of Chilean littoral fishes
Provedor de dados: 97
Autores: OJEDA,F. PATRICIO; LABRA,FABIO A; MUÑOZ,ALEJANDRO A.
In this study, we analyzed the biogeographic patterns of the Chilean littoral fish fauna, including latitudinal trends in teleost and chondrichthyan fish species richness, their distribution range patterns, and their level of endemism, both to the Chilean coast and the Southeastern Pacific. We determined the number and percentage of fish taxa within four different groups based on their biogeographic affinities. This was done, both for teleost and chondrichthyan fishes, at the species, genus and family level. In order to recognise the existence of biogeographic regions, we applied cluster and ordination analyses to the distribution data, using objective bootstrapping techniques at the three taxonomic levels used. We found that littoral fish diversity...
Tipo: Journal article
Palavras-chave: Marine biogeography; Littoral fishes; Endemism; Southeastern Pacific Ocean; Latitudinal diversity patterns.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400007

BIOGEOGRAPHY OF DEEP-WATER CHEMOSYNTHETIC ECOSYSTEMS (CHESS): EXPLORING THE SOUTHERN OCEANS
Provedor de dados: 72
Autores: Ramírez Llodra,Eva; Tyler,Paul A; German,Christopher R.
The vast majority of the mid-ocean ridge system and of the continental margins around the globe have not yet been explored. A relatively small number of vent and seep sites have been analysed and are the focus of long-term research programmes. However, the exploration of new areas will certainly provide the discovery of new vent and seep sites. Furthermore, the study of these key locations will lead to the description of new species and improve our understanding of the abundance, diversity, and distribution of species from chemosynthetically-driven systems around the world's oceans. It is the aim of ChEss to develop an exploration field phase to discover new deep-water hydrothermal vents and cold seeps at key locations, to describe their fauna, and to...
Tipo: Journal article
Palavras-chave: Biogeography; Hydrothermal vents; Cold seeps; Southern oceans.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200006

Biohydrogen production by Thermoanaerobacterium thermosaccharolyticum KKU-ED1: Culture conditions optimization using mixed xylose/arabinose as substrate
Provedor de dados: 69
Autores: Saripan,Arunsri Fangkum; Reungsang,Alissara.
Background: Biological hydrogen production by microorganisms can be divided into two main categories i.e. photosynthetic organisms that produce hydrogen using light as energy source and anaerobic bacteria that produce hydrogen via dark fermentation. Dark fermentative hydrogen production by anaerobic bacteria has the advantages of a higher HPR without illumination and of the capability to convert various kinds of substrate. Results: Thermophilic hydrogen producer was isolated from elephant dung and identified as Thermoanaerobacterium thermosaccharolyticum KKU-ED1 by 16S rRNA gene analysis, which was further used to produce hydrogen from mixed pentose sugar i.e., xylose/arabinose. The optimum conditions for hydrogen production from mixed xylose/arabinose by...
Tipo: Journal article
Palavras-chave: Arabinose; Biohydrogen; Elephant dung; Hydrolysate; Thermophilic; Xylose.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000100001

Bioinformatic prediction of polymerase elements in the rotavirus VP1 protein
Provedor de dados: 48
Autores: VÁSQUEZ-DEL CARPIÓ,RODRIGO; MORALES,JAIME L; BARRO,MARIO; RICARDO,ALBA; SPENCER,EUGENIO.
Rotaviruses are the major cause of acute gastroenteritis in infants world-wide. The genome consists of eleven double stranded RNA segments. The major segment encodes the structural protein VP1, the viral RNA-dependent RNA polymerase (RdRp), which is a minor component of the viral inner core. This study is a detailed bioinformatic assessment of the VP1 sequence. Using various methods we have identified canonical motifs within the VP1 sequence which correspond to motifs previously identified within RdRps of other positive strand, double-strand RNA viruses. The study also predicts an overall structural conservation in the middle region that may correspond to the palm subdomain and part of the fingers and thumb subdomains, which comprise the polymerase core of...
Tipo: Journal article
Palavras-chave: Rotavirus; Genome replication; RNA polymerase; Bioinformatic analysis.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000500008

Bioinformatics: an essential tool for Biotechnology
Provedor de dados: 69
Autores: Grau,Oscar.
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100001

Biología de la raya Psammobatis extenta (Garman, 1913) (Batoidea: Rajidae)
Provedor de dados: 97
Autores: BRACCINI,JUAN M.; CHIARAMONTE,GUSTAVO E.
Psammobatis extenta es un miembro común de la fauna de rayas de las costas de Sudamérica y su biología ha sido poco estudiada. Se investigaron aspectos de la biología de P. extenta a partir de datos obtenidos del descarte de arrastres comerciales de la flota pesquera de Puerto Quequén, Argentina, en febrero de 2000. La talla máxima alcanzada por las hembras fue 313 mm L T y 295 mm L T, por los machos. Las proporciones que presentaron menor variación y relación isométrica fueron: distancia narina-boca, distancia interorbital, longitud ojo+espiráculo, largo de disco y ancho de disco. La relación L T-Peso total presentó diferencias significativas (P &lt; 0,05) entre hembras y machos, las primeras alcanzando un mayor peso para el mismo L T. Los machos alcanzan...
Tipo: Journal article
Palavras-chave: Psammobatis; Rajidae; Puerto Quequén.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100017

Biología del Desarrollo Vascular: Mecanismos en Condiciones Físiológicas y Estrés Flujo
Provedor de dados: 77
Autores: Rodríguez-Núñez,Iván; Romero,Fernando; González,Marcelo; Campos,Ruy R.
La vasculogénesis es controlada por una serie de mecanismos que se activan en función del tiempo y del espacio durante el desarrollo embrionario. Múltiples son las vías de señalización implicadas en las etapas del proceso vasculogénico, las que se inician con estímulos angiogénicos desde el mesodermo o desde el endodermo para dar origen a los angioblastos (células progenitoras endoteliales). Proteínas como el factor de crecimiento vascular endotelial (VEGF), factor de crecimiento fibroblastico 2 (FGF2), entre otras, constituyen factores claves en la inducción de este proceso. Posteriormente, los angioblastos deben migrar para dar origen a los vasos primitivos, proceso en el que participan factores atrayentes y repulsivos que orientarán la dirección de su...
Tipo: Journal article
Palavras-chave: Endotelio; Ejercicio; Neovascularización Fisiológica; Moduladores de la Angiogénesis.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400026

Biología floral y reproductiva de Escallonia pulverulenta (Ruiz et Pav.) Pers. (Escalloniaceae) y su relación con los visitantes florales
Provedor de dados: 73
Autores: Rivera-Hutinel,Antonio; Acevedo-Orellana,Fernando.
RESUMEN Se determinó la biología floral y el sistema reproductivo de Escallonia pulverulenta, arbusto endémico de Chile central. Para ello se realizaron tratamientos de polinización manual, automática y natural a flores, evaluándose la producción de semillas por fruto. Además se determinó la longevidad floral, la producción de semillas según la distancia a la planta donante, los patrones de floración y su relación con los visitantes florales. La especie es autoincompatible y requiere vectores bióticos para reproducirse. Las plantas florecen sincrónicamente y logran el máximo despliegue floral a los 13 días de iniciar la floración. Cada flor queda disponible para ser polinizada durante 5 días y noches, y la fecundidad no incrementó con la distancia a la...
Tipo: Journal article
Palavras-chave: Autoincompatibilidad; Longevidad floral; Distancia a la planta donante; Polinizadores; Matorral mediterráneo.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100082

Biología poblacional de huirales submareales de Macrocystis integrifolia y Lessonia trabeculata (Laminariales, Phaeophyceae) en un ecosistema de surgencia del norte de Chile: variabilidad interanual y El Niño 1997-1998
Provedor de dados: 97
Autores: ALONSO VEGA,J.M.; VÁSQUEZ,JULIO A.; BUSCHMANN,ALEJANDRO H.
This paper describes the population biology of Lessonia trabeculata and Macrocystis integrifolia during and after the 1997-1998 El Niño in an area of permanent coastal upwelling in northern Chile. Spatial and temporal patterns of distribution were evaluated seasonally for adult and juvenile sporophytes of both species between 1996 and 2003. These two kelp form an assemblage distributed between 2 and 15 m depth, with disjunct patterns along a bathymetric gradient, including two morphs of L. trabeculata, the occurrence of which depends on the presence or absence of M. integrifolia. During the 1997-1998 El Niño the spatial-temporal patterns of abundance of the kelp assemblage were maintained by the continuity of coastal upwelling, which buffered and moderated...
Tipo: Journal article
Palavras-chave: Subtidal habitats; Population and community ecology; Extinction and re-colonization processes; Kelp-herbivore interaction; El Niño; La Niña.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000100004

Biología reproductiva de Convolvulus chilensis (Convolvulaceae) en una población de Aucó (centro-norte de Chile)
Provedor de dados: 97
Autores: Suárez,Lorena H.; González,Wilfredo L.; Gianoli,Ernesto.
Convolvulus chilensis es una hierba perenne, única representante endémica de la familia Convolvulaceae en Chile. Se estudió el sistema de reproducción, fenología, morfología y longevidad floral de C. chilensis en una población natural ubicada en la localidad de Aucó, dentro de la Reserva Nacional Las Chinchillas, IV Región, Chile. Se montó un experimento de polinización controlada considerando los tratamientos de polinización natural, polinización cruzada, autopolinización manual, autopolinización automática y apomixis, evaluándose su efecto sobre la formación de frutos y el número de semillas producidas por fruto. Adicionalmente, se compararon los siguientes atributos de la progenie según tipo de polinización (autopolinización o polinización cruzada):...
Tipo: Journal article
Palavras-chave: Convolvulaceae; Convolvulus chilensis; Sistema de reproducción; Autocompatibilidad; Autogamia.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400001

Biología reproductiva de Dosidicus gigas D'Orbigny 1835 (Cephalopoda, Ommastrephidae) en la zona norte-centro de Chile
Provedor de dados: 72
Autores: González,Paola ; Chong,Javier .
El presente trabajo estudia la biología reproductiva de la jibia o calamar gigante, Dosidicus gigas frente a la costa de Chile central capturados en julio-agosto (invierno) y octubre-noviembre (primavera) de 1993. En 254 hembras (93 de invierno y 161 de primavera) se analizó el estado de madurez microscópico, determinándose un predominio de hembras en maduración, y en menor porcentaje a punto de desovar. El índice gonadosomático (IGS) y el índice del peso del complejo oviductual (IPCO) indicaron que las hembras estaban en un proceso de maduración gonádica. En hembras, el IGS y el IPCO muestran diferencias significativas en los valores promedio entre invierno y primavera (p= 0,000 y p= 0,002, respectivamente). Sólo para el IPCO de invierno existió una...
Tipo: Journal article
Palavras-chave: Jibia; Dosidicus gigas; Reproducción; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200011

Biología reproductiva de la serpiente semiacuática Liophis semiaureus (Serpentes, Colubridae) en el nordeste de Argentina
Provedor de dados: 97
Autores: LÓPEZ,SOLEDAD M; GIRAUDO,ALEJANDRO R; ARZAMENDIA,VANESA; CHIARAVIGLIO,MARGARITA.
Las serpientes tienen una notable flexibilidad y diversidad en sus tácticas reproductivas, a pesar de ello, los estudios acerca de la biología reproductiva de especies sudamericanas en zonas subtropicales-templadas son escasos. Se analizó la biología reproductiva de Liophis semiaureus en el nordeste de Argentina, incluyendo la madurez y dimorfismo sexual, fecundidad y ciclo reproductivo. Las hembras maduras fueron significativamente más largas, presentaron mayor peso corporal y alcanzaron la madurez sexual a una longitud mayor que los machos. Los machos tuvieron colas más largas que las hembras. El ciclo reproductivo fue estacional con mayor actividad en los períodos templados del año aunque previos a la época de inundaciones. Liophis semiaureus invirtió...
Tipo: Journal article
Palavras-chave: Madurez; Dimorfismo sexual; Fecundidad; Ciclo reproductivo; Liophis semiaureus; Argentina.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000200006

Biología reproductiva de la tagua común (Fúlica armillata) y la tagua de frente roja (F. rufifrons) en un área agroforestal del centro-sur de Chile
Provedor de dados: 72
Autores: Silva,Carolina; Barrientos,Carlos; Figueroa R,Ricardo A; Martín,Nicolás; Contreras,Álex; Ardiles,Karen; Moreno,Lucila; González-Acuña,Daniel.
Entre los periodos reproductivos 2008 y 2009, se estudió la nidificación y reproducción de Fúlica armillata y F rufifrons que habitan una laguna natural en un área agroforestal del centro-sur de Chile. Se estudiaron las diferencias en las características de los nidos, tamaño de las puestas, características de los huevos, periodo de incubación, éxito de eclosión y características de los pichones, con el objetivo de aportar información básica sobre la ecología reproductiva de estas especies. En ambas especies el periodo reproductivo se inició a fines de septiembre, extendiéndose hasta finales de enero. Las plataformas de nidificación de ambas taguas fueron de tamaño similar y estuvieron compuestas de juncos secos entrecruzados siguiendo un patrón circular,...
Tipo: Journal article
Palavras-chave: Éxito de eclosión; Chile; Nidos; Tagua; Reproducción.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200005

Biología reproductiva de los tiburones de profundidad Aculeola nigra De Buen, 1959, y Centroscyllium nigrum Garman, 1899 (Chondrichthyes: Etmopteridae), centro-norte de Chile
Provedor de dados: 72
Autores: Gatica,Cecilia; Acuña,Enzo.
Se describen aspectos de la reproducción de los tiburones de profundidad Aculeola nigra y Centroscyllium nigrum, capturados como fauna acompañante de la pesquería de crustáceos. Se examinó un total de 269 especímenes de A. nigra y 284 especímenes de C. nigrum obtenidos en la zona centro-norte de Chile, durante los meses de junio a diciembre del 2006, a los que se les evaluó su condición reproductiva, se caracterizó sus gónadas, se obtuvieron el IGS, IHS y la talla de madurez sexual (L 50%). Los resultados mostraron que el IGS es máximo entre agosto y septiembre en A. nigra y entre septiembre y noviembre en C. nigrum, indicando que probablemente esa sea su época de máxima reproducción. Se obtuvo la talla de madurez sexual para ambas especies; 38 cm longitud...
Tipo: Journal article
Palavras-chave: Estructura microscópica; Reproducción; Talla de madurez sexual; Viviparía lecitotrófica.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000100001

Biología Reproductiva de Mytilopsis leucophaeata (Conrad, 1831) (Bivalvia: Dreissenidae) de la Laguna de Tampamachoco, Túxpam-Veracruz
Provedor de dados: 77
Autores: Pérez-Sarabia,Noemí; Uría-Galicia,Esther; Ortiz-Ordoñez,Esperanza; Belmar-Pérez,Jorge.
Se caracterizó el ciclo reproductivo de Mytilopsis leucophaeata (Conrad, 1831) en organismos colectados mensualmente durante un ciclo anual en la laguna de Tampamachoco, Túxpam, Veracruz, que se ubica en la costa del Golfo de México en la Región Terrestre Prioritaria (RTP-103) de CONABIO considerada sitio RAMSAR 1602 en México. Los resultados histológicos indican que M. leucophaeata presenta cuatro etapas gametogénicas: gametogénesis, madurez, desove total para hembras y expulsión parcial para machos. Uno de los principales factores que influyen en el desove sincrónico de gametos tanto en machos como en hembras es la salinidad, en los meses de enero a marzo.
Tipo: Journal article
Palavras-chave: Biología reproductiva; Ciclo reproductivo; Mytilopsis leucophaeata; Gametos; Laguna de Tampamachoco.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400042

Biología reproductiva del águila Geranoaetus melanoleucus (Aves: Accipitridae) en Chile central
Provedor de dados: 97
Autores: PAVEZ,EDUARDO F.
Durante dos años (julio 1987­enero 1989) se estudió la biología reproductiva del águila (Geranoaetus melanoleucus) en San Carlos de Apoquindo, en Chile central. El inicio del período reproductivo se evidenció por un aumento del número de vuelos en pareja. Los cortejos incluyeron vuelos sincronizados de la pareja, capturas, transporte de material al nido y cópulas. Los traspasos de presas ocurrieron durante todo el año, aunque fuera del período reproductivo fueron escasos y forzados por la hembra. Se localizaron 4,7 nidos pareja-1, lo que está en el límite superior documentado para grandes águilas. Fuera del período reproductivo las águilas visitaron ocasionalmente los nidos. Antes de la postura el macho visitó el nido con mayor frecuencia y por menos...
Tipo: Journal article
Palavras-chave: Águila; Geranoaetus melanoleucus; Conducta; Reproducción; Chile central.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300014

Biología reproductiva y conservación: el caso de la regeneración de bosques templados y subtropicales de robles (Quercus spp.)
Provedor de dados: 97
Autores: Pulido,Fernando J.
En este trabajo se revisan los resultados de 21 estudios experimentales sobre la regeneración de bosques de roble (Quercus spp.) en los que se analizan al menos tres de las fases del ciclo reproductivo: fertilización, desarrollo de frutos viables, dispersión, consumo postdispersivo, germinación-emergencia de plántulas, establecimiento de juveniles y reclutamiento de adultos. La mayoría de las poblaciones estudiadas se encontraban en bosques templados de Norteamérica y Europa, repartidos de forma equitativa entre bosques de ambientes xéricos (incluidos los mediterráneos) con especies perennes y habitualmente bajo explotación, y bosques de ambientes mésicos o montanos con especies generalmente caducifolias y escasamente alterados. Los estudios se...
Tipo: Journal article
Palavras-chave: Dispersión; Facilitación; Herbivorismo; Producción de semillas; Quercus; Reclutamiento; Regeneración forestal; Robles; Sitios seguros.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100002

Biological Activity in a Degraded Alfisol Amended with Sewage Sludge and Cropped with Yellow Serradela (Ornithopus compressus L.)
Provedor de dados: 117
Autores: Celis H,José; Machuca H,Angela; Sandoval E,Marco; Morales C,Patricia.
There are few studies about the impact of sewage sludge on the biological properties in Alfisols of the Chilean Coastal Range drylands. Hence, the objective of this study was to evaluate its effect on the microbial respiration and enzymatic activities of a degraded Alfisol located in the Bío Bío Region (Chile) that was cropped with yellow serradela (Ornithopus compressus L.). Sludge was added to the soil at rates of 15, 30, and 60 t ha-1; he following treatments were defined: L15-P = 15 t ha-1 sludge + O. compressus; L30-P = 30 t ha-1 sludge + O. compressus; L60-P = 60 t ha-1 sludge + O. compressus; L15 = 15 t ha-1 sludge; L30 = 30 t ha-1 sludge; L60 = 60 t ha-1 sludge; CP = non-amended soil, cropped; and C = non-amended soil, no crop. Soil microorganism...
Tipo: Journal article
Palavras-chave: Biosolids; Respiration; Enzymatic activity; Degraded soils; Remediation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100020

Biological Activity of Essential Oils from Leaves and Fruits of Pepper Tree (Schinus molle L.) to Control Rice Weevil (Sitophilus oryzae L.)
Provedor de dados: 117
Autores: Benzi,Verónica; Stefanazzi,Natalia; Ferrero,Adriana A.
Rice weevil (Sitophilus oryzae L.) is a primary insect pest of stored grain. The development of resistance resulted in the application of synthetic insecticides. In recent years many plant essential oils have provided potential alternatives to currently used insect control agents. The Brazilian pepper tree (Schinus molle L. var. areira (L.) DC.) (Anacardiaceae) has different biological properties such as insecticidal activity. In this study, repellent, fumigant activity, nutritional indices, and feeding deterrent action were evaluated on S. oryzae adults. Filter paper impregnation was used to test fumigant toxicity, whereas treated whole wheat was used to evaluate repellent activity and a flour disk bioassay was done to evaluate feeding deterrent action...
Tipo: Journal article
Palavras-chave: Repellency; Fumigant toxicity; Nutritional indices; Feeding deterrence.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000200004

Biological applications of honeys produced by Apis mellifera
Provedor de dados: 48
Autores: Montenegro,Gloria; Mejías,Enrique.
Honey is a natural product with many attributes that are useful for humans. The consumption of honey is increasing because of its beneficial biological properties, including antioxidant and antibacterial activities. Even though honey is produced worldwide, many variants of this product have not been studied and their biological potential for alternative uses has not been evaluated. Because of its varied endemic native flora, Chile produces several types of honey. It is likely that these apian products have important biological properties inherited from specific floral sources, but it is absolutely necessary to conduct further chemical analyses to identify and characterize these biological attributes. Sadly, the potential antimicrobial and antitumor...
Tipo: Journal article
Palavras-chave: Honeys; Antioxidants; Natural Antibiotics; Environmental Bioindicator.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400005

BIOLOGICAL ASPECTS INVOLVED IN THE DEGRADATION OF ORGANIC POLLUTANTS
Provedor de dados: 126
Autores: Diez,M.C.
Worldwide use of pesticide has increased dramatically during the last two decades. As a consequence, pesticide residues and their transformation products are frequently found in groundwater and surface waters. This review summarizes information about polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), some chlorophenols; it mainly empathizes on pesticides, their incorporation into the environment, microorganisms involved in their degradation and, some physico-chemical aspects of pesticides behavior in soils. Details about residues of pesticides in groundwater and superficial water found in some foreign countries and in Chile are reported, as well. The fungal degradation of organic pollutants (xenobiotics) is considered as an...
Tipo: Journal article
Palavras-chave: Biodegradation; White-rot fungi; Pesticides; Biobeds.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100004

Biological aspects of the genus Brachistosternus (Bothriuridae) in the Atacama Desert (Chile), with the description of a new type of pedipalp macroseta
Provedor de dados: 72
Autores: Ojanguren-Affilastro,Andrés A.; Botero-Trujillo,Ricardo; Castex,Alberto; Pizarro-Araya,Jaime.
ABSTRACT New data about several aspects of the biology of scorpions of genus Brachistosternus of the Atacama Desert are provided. Predatory techniques on tenebrionid larvae, and large spiders in their burrows are described, as well as the method used to transport large preys. The habitat of Brachistosternus mattonii Ojanguren-Affilastro 2005, by the tide line, is described for the first time. Finally a new type of pedipalp macroseta of Bothriuridae is described.
Tipo: Journal article
Palavras-chave: Scorpiones; Brachistosternus; Atacama; Predation; Macroseta.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200169

Biological characteristics of Palmistichus elaeisis Delvare &amp;amp; LaSalle (Hymenoptera: Eulophidae) on refrigerated pupae of Anticarsia gemmatalis Hubner (Lepidoptera: Noctuidae)
Provedor de dados: 117
Autores: Pereira,Fabricio Fagundes; Cola Zanuncio,José; Oliveira Kassab,Samir; Pastori,Patrik Luiz; Hidalgo Barbosa,Rogério; Rossoni,Camila.
Mass rearing of parasitoids is a fundamental step for biological control programs. The biological characteristics of Palmistichus elaeisis Delvare &amp;amp; LaSalle (Hymenoptera: Eulophidae) were evaluated in pupae of Anticarsia gemmatalis Hubner (Lepidoptera: Noctuidae) stored at low temperatures. Twenty four hours-old pupae of A. gemmatalis were stored at 12 °C for 0, 1, 3, 6, 9, and 12 d and then exposed to parasitism by P. elaeisis females. The life span of P. elaeisis was affected and ranged from 19 to 24 d on the pupae of the host. Parasitism reached 100% of the host pupae after storage in all periods at 12 °C, and adults emerged from 20.00 to 54.54% of them. The progeny of P. elaeisis ranged from 71 to 198 and had an inverse relationship with the...
Tipo: Journal article
Palavras-chave: Biological control; Parasitism; Parasitoid rearing; Temperature.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200005

Biological control of Rhizoctonia solani in tomatoes with Trichoderma harzianum mutants
Provedor de dados: 69
Autores: Montealegre,Jaime; Valderrama,Luis; Sánchez,Soledad; Herrera,Rodrigo; Besoain,Ximena; Pérez,Luz María.
Biocontrol of Rhizoctonia solani in tomatoes cultivated under greenhouse and field conditions was analyzed using the Trichoderma harzianum mutants Th650-NG7, Th11A80.1, Th12A40.1, Th12C40.1 and Th12A10.1 and ThF2-1, respectively. Their innocuousness on tomato cultivars 92.95 and Gondola (greenhouse assays), and on cultivar Fortaleza (field assays) was established. Alginate pellets (1.7 g pellets/L soil) containing c.a1 x 10(5) colony forming units (cfu)/g pellet were applied to a soil previously inoculated with R. solani at transplant (greenhouse) or to a naturally infected soil (field). Controls considered parental wild strains, a chemical fungicide and no additions. Th11A 80.1, Th12A10.1 and Th650-NG7 prevented the 100% mortality of tomato plants cv....
Tipo: Journal article
Palavras-chave: Bioantagonism; Field assays; Greenhouse assays; Root rot; Tomato.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000200001

Biological effects of an aqueous extract of Salix alba on the survival of Escherichia coli AB1157 cultures submitted to the action of stannous chloride
Provedor de dados: 48
Autores: SOUZA,RAPHAEL S S; ALMEIDA,MARCELA C; MANOEL,CRISTIANO V; SANTOS-FILHO,SEBASTIÃO D; FONSECA,ADENILSON S; FILHO,MARIO BERNARDO.
Stannous chloride (SnC12) is used in nuclear medicine as a reducing agent to obtain technetium-99m-radiopharmaceuticals. It have been reported that natural products might reduce the genotoxic and cytotoxic effects related to SnC12. This work evaluated the biological effects of an aqueous extract of Salix alba on the survival of Escherichia coli (E. coli) AB1157 (wild type) cultures submitted to the action of SnC12. E. coli AB1157 cultures (exponential growth phase) were collected by centrifugation, washed and resuspended in 0.9%NaCl. Samples were incubated in water bath shaker with: (a) SnC12 (25mg/ml), (b)Salix alba extract(11.6mg/ml) and (c)SnC12(25mg/ml) + Salix alba extract (11.6mg/ml). Incubation with 0.9% NaCl was also carried out (control). At 60...
Tipo: Journal article
Palavras-chave: Escherichia coli; Free radicals; Salix alba; Stannous chloride.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200008

Biological Effects Produced by Intense Pulsed Light (Xe-Cl) on the Cartilage of the Tongue Chick Embryo Using Various Filters
Provedor de dados: 77
Autores: Avila,R. E; Samar,M. E; Juri,H; Femopase,G. A; Hidalgo,M; Ferrero,J. C; Rinaldi,C; Fonseca,I; Juri,G.
The Laser used correctly in the medical practice offers clear advantages compared with traditional therapies. The improvement and even the elimination of many significant skin lesions can be achieved with reduced risks to patients. However, it is important to keep security measures and understand the possible effects on an experimental model. The chick embryo is a good model to evaluate the direct effects of non-ionizing radiation for its easy handling and availability. The purpose of this communication is to show our histological findings in organs of the chick embryo with and without protective barrier to be subjected to radiation excimer. We used the following issuers: intense pulsed light (excimer Xe-Cl laser of 308 nm wavelength). It was irradiated...
Tipo: Journal article
Palavras-chave: Biological effects; Intense pulsed light (Xe-Cl); Cartilage; Tongue; Chick embryo.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400007

Biological evaluation of novel 6-Arylbenzimidazo [1,2-c] quinazoline derivatives as inhibitors of LPS-induced TNF- alpha secretion
Provedor de dados: 48
Autores: GALARCE,GLORIA D; FONCEA,ROCÍO E; EDWARDS,ANA M; PESSOA-MAHANA,HERNÁN; PESSOA-MAHANA,CARLOS D; EBENSPERGER,ROBERTO A.
This study describes the effect of novel 6-Arylbenzimidazo [1,2-c] quinazoline derivatives as tumor necrosis factor alpha (TNF-á) production inhibitors. The newly synthesized compounds were tested for their in vitro ability to inhibit the lipolysaccharide (LPS) induced TNF-á secretion in the human promyelocytic cell line HL-60. The compound 6-Phenyl-benzimidazo [1,2-c] quinazoline, coded as Gl, resulted as the most potent inhibitor and with no significant cytotoxic activity. Thus, 6-Arylbenzimidazo [1,2-c] quinazoline derivatives may have a potential as anti-inflammatory agents
Tipo: Journal article
Palavras-chave: Anti-inflammatory agents; Benzimidazoquinazoline derivatives; TNF-á inhibitors.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000100006

Biological Fixation of N2 in Mono and Polyspecific Legume Pasture in the Humid Mediterranean Zone of Chile
Provedor de dados: 117
Autores: Espinoza,Soledad; Ovalle,Carlos; del Pozo,Alejandro; Zagal,Erik; Urquiaga,Segundo.
Despite annual legume pasture are of great importance for dryland agricultural systems in Mediterranean environments, there are few studies of N2 biological fixation (NBF) reported in Chile. In this study the NBF of four annual legume species: subterranean clover (Trifolium subterraneum L.), yellow serradella (Ornithopus compressus L.), arrow-leaf clover (T. vesiculosum L.), and crimson clover (T. incarnatum L.) (Experiment 1), as well as seven mixtures of these species (Experiment 2) were assessed. The NBF was measured by the 15N natural abundance technique. The objective was to determine NBF in the legume species and in distinct mixtures used. The study was carried out in an Andisol of the Andean Precordillera located in the humid Mediterranean zone of...
Tipo: Journal article
Palavras-chave: Natural abundance of 15N; Mediterranean pastures; Volcanic soil.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100016

Biological Maturity Status and Motor Performance in Fourteen-Year-old Basketball Players
Provedor de dados: 77
Autores: Jakovljevic,Sasa; Macura,Marija; Radivoj,Mandic; Jankovic,Nenad; Pajic,Zoran; Erculj,Frane.
The aims of this study were to detect biological maturity and certain athletic skills in boys aged 14 participating in competitive basketball, and to compare certain athletic skills of participants according to their biological maturity status. The participants were most talented Serbian basketball players (n= 49) who were divided into three groups according to their maturity status: early (n= 14), average (n= 24) and late maturing (n= 11). Biological maturity status of participants was assessed by technique developed by Mirwald et al. (2002). Nine tests of basic athletic skills: vertical jump, medicine ball throwing, run at 20, 30 and 50 m, agility t-test, zigzag agility drill, agility run 4x15 m, the line drill, as well as four basketball skills field...
Tipo: Journal article
Palavras-chave: Chronological age; Biological age; Motor abilities; Basketball skills.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200035

Biological parameters of Cydnodromus picanus and Phytoseiulus persimilis raised on the carmine spider mite, Tetranychus cinnabarinus (Acari: Phytoseiidae, Tetranychidae)
Provedor de dados: 118
Autores: Tello,Víctor; Vargas,Robinson; Araya,Jaime; Cardemil,Antonieta.
The postembryonic development, consumption and life table parameters of Cydnodromus picanus Ragusa and Phytoseiulus persimilis (Athias-Henriot) were studied at 29.44 ± 1.47 °C and 42.35 ± 5.01% of RH with a photoperiod of 14:10 h (L:D) in order to evaluate the potential of these predators for feeding on the carmine spider mite Tetranychus cinnabarinus (Boisduval). Eggs, larvae and protonymphs of T cinnabarinus may be optimal food for C. picanus, which obtained survival rates of 100%, 97% and 93%, respectively, on them. The survival of P persimilis was around 6.7% with diets based on eggs, larvae and protonymphs, showing a high mortality level by dehydration when fed with eggs. The time of the postembryonic development was significantly shorter (p &lt;...
Tipo: Journal article
Palavras-chave: Biological control; Life table; Postembryonic development; Predation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000200012

Biological properties of the Chilean native moss Sphagnum magellanicum
Provedor de dados: 48
Autores: MONTENEGRO,GLORIA; PORTALUPPI,MARIANA C; SALAS,FRANCISCO A; DÍAZ,MARÍA F.
An ethanol extract prepared from the gametophyte Chilean native moss Sphagnum magellanicum was dried out, weighed and dissolved in distilled water. This extract was then assayed for its antibacterial activity against the G(-) bacteria Azotobacter vinelandii, Erwinia carotovora subsp. carotovora, Enterobacter aerogenes, Escherichia coli, Pseudomonas aeruginosa, Salmonella typhi, Vibrio cholerae, and the G(+) bacteria Staphylococcus aureus subsp. aureus, and Streptococcus type b. The growth of the cultures of E. carotovora subsp. carotovora, and V. cholerae was inhibited at a concentration of 581mg/ml of extract, while the cultures of E. coli, S. typhi and Streptococcus type b were inhibited at a concentration of 1.16 mg/mL of extract. The concentration of...
Tipo: Journal article
Palavras-chave: Sphagnum magellanicum; Phenolic compounds; Antibacterial activity; MIC.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200012

Biological Research Factor de Impacto 1,154
Provedor de dados: 48
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000300006

Biological Research marks its 50th year by joining BioMed Central
Provedor de dados: 48
Autores: Santos,Manuel J.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100001

Biological screening of selected flora of Pakistan
Provedor de dados: 48
Autores: Zia-Ul-Haq,M; Raza Shah,M; Qayum,Mughal; Ercisli,Sezai.
Methanolic extracts of different parts of five medicinal plants, Ferula assafoetidaL. resin, Grewia asiaticaL. leaves, Ipomoea hederaceaJacq. seeds, Lepidium sativumL. seeds and Terminalia chebulaRetz. fruits were tested in vitrofor their cytotoxic, phytotoxic, insecticidal, nematicidal and anthelmintic activities. Ipomoea hederaceashowed very significant phytotoxic and cytotoxic activity, with 100% inhibition of Lemna minorgrowth and 100% death of Artemia salinaat concentrations of 1000 and 100 µg mL-1. Grewia asiaticaexhibited very weak activities while Lepidium sativumand Ferula assafoetidashowed moderate to good potential in all three bioassays. The results suggest screening of Ipomoea hederaceaseeds further for isolation of bioactive compounds that...
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000400008

Biological treatment of contaminated air with toluene in an airlift reactor
Provedor de dados: 69
Autores: Vergara-Fernández,Alberto O; Quiroz,Erich F; Aroca,Germán E; Alarcón Pulido,Nelson A.
In this work the variation in the toluene elimination capacity of an airlift bioreactor as a function of the toluene inlet load, using compost as the support material for the microorganisms was studied. In order to evaluate the flexibility of the reactor under changing toluene load, the toluene biodegradation was measured for flows from 2.4 x 10-2 to 0.132 m³ h-1, and a concentration range from 1.4 to 0.8 g m-3. Results show a 100% removal efficiency (RE) for minor flows, however, for a flow increase of 450% the RE decreased 40%, reflecting the equipments weak flexibility in varying flows. Meanwhile the maximum elimination capacity obtained was 230 g m-3 h-1, for toluene loads of 550 g m-3 h-1, corresponding to a flow of 0.132 m³ h-1. It was found that a...
Tipo: Journal article
Palavras-chave: Airlift bioreactors; Biofiltration; Bioscrubbers; Toluene.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400003

Biological vulnerability in the Elqui Valley (Coquimbo Region, Chile) to economically important arthropods
Provedor de dados: 118
Autores: Pizarro-Araya,Jaime; Cepeda-Pizarro,Jorge; Barriga,Juan E; Bodini,Andrés.
Current climate conditions in north-central Chile (25057'-32013'S,71043'-68°16'W)are characterized by increasing temperatures and decreasing rainfall. Global warming is expected to alter the hydrology and ecoclimatic characteristics of north-central basins with multiple effects, including changes in plant and arthropod phenology and biodiversity. Among these basins, the Elqui Valley (29°50'S, 70°52'W) stands out for its large population and the economic importance of tourism and agriculture. The taxonomic composition of agriculturally and medically important arthropods was studied in three locations in the Elqui Valley by manual capture of specimens and interviews with farmers, agricultural workers, and local leaders. Out of a total of 145 species of...
Tipo: Journal article
Palavras-chave: Arthropods; Climate change; Agricultural cropland; Rangeland; Elqui Valley; Arid zones.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000200006

BIOLOGICAL WARFARE, BIOTERRORISM, BIODEFENCE AND THE BIOLOGICAL AND TOXIN WEAPONS CONVENTION
Provedor de dados: 69
Biological warfare is the intentional use of micro-organisms, and toxins, generally of microbial, plant or animal origin to produce disease and death in humans, livestock and crops. The attraction of bioweapons in war, and for use in terroristic attacks is attributed to easy access to a wide range of disease-producing biological agents, to their low production costs, to their non-detection by routine security systems, and to their easy transportation from one place to another. In addition, novel and accessible technologies give rise to proliferation of such weapons that have implications for regional and global security. In counteraction of such threats, and in securing the culture and defence of peace, the need for leadership and example in devising...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000300001

Biomarcadores y Marcadores de Imagen de la Enfermedad de Alzheimer
Provedor de dados: 77
Autores: Pardi,P.C; Santos,G.A.A; Silva Gois,J.C; Braz Jr,R.G; Olave,E.
Este artículo presenta un análisis desde el punto de vista bibliográfico de marcadores y biomarcadores de la enfermedad de Alzheimer (EA). Las metodologías usadas fueron los marcadores de imágenes (Resonancia Magnética y Tomografía por emisión de positrones) y biomarcadores de la proteína BA42, de la proteína Tau y de la Apoliproteína E (ALPE). De esta manera, son de importancia los niveles de BA42 disminuidos, la Tau incrementada, los polimorfismos de ALPE y las alteraciones constatadas en los marcadores de imagen, como factores de riesgo esenciales para el desarrollo de la EA. Se realiza una revisión de la literatura con respecto a los hallazgos clínicos de esta enfermedad.
Tipo: Journal article
Palavras-chave: Apolipoproteína; Proteína Tau; Biomarcadores.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300011

Biomarkers for screening of lung cancer and pre-neoplastic lesions in a high risk Chilean population
Provedor de dados: 48
Autores: Adonis,Marta I; Díaz,Jose; Miranda,Veronica R; Chahuan,Marco; Zambrano,Alcides; Benitez,Hugo C; Campos,Monica; Avaria,Pablo; Urzúa,Ulises; Marín,Pedro; Gohurdett,Mariela; Cisterna,Yasna; Gil,Lionel.
BACKGROUND: The mortality of lung cancer (LC), increases each year in the world, in spite of any advances, in development of new drugs to advance stages of LC. The high incidence of LC has been associated with smoking habit, genetic diversity and environmental pollution. Antofagasta region has been reported to have the highest LC mortality rate in Chile and its inhabitants were exposed to arsenic in their drinking water in concentrations as high as 870 &amp;#956;g/L. Non-invasive techniques such as biomarkers (Automatic Quantitative Cytometry: AQC and DR70) and Auto Fluorescence Bronchoscopy (AFB) might be potentially useful as a supplementary diagnostic approach and early detection. Early detection is one of the most important factors to intervene and...
Tipo: Journal article
Palavras-chave: Early detection; Biomarkers; Lung cancer.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100056

BIOMASA, DENSIDAD Y COMPOSICION ZOOPLANCTONICA DE LA BAHIA DE MOCHIMA, VENEZUELA
Provedor de dados: 72
Autores: Márquez-Rojas,Brightdoom; Marín,Baumar; Díaz-Ramos,J.R; Troccoli,Luis.
La biomasa, densidad y composición del zooplancton de la bahía de Mochima fueron estudiadas durante 1998. Las muestras fueron recolectadas mensualmente en la entrada de la bahía (estación A) y en la parte interna (estación B) entre enero y diciembre de 1998. En cada estación se realizaron calados oblicuos con una malla estándar de 300 micras y 0,25 m de diámetro de boca a 0-5 y 10-15 m y a una velocidad de dos nudos durante 10 min. El índice de surgencia se calculó a partir de los datos de vientos. Se midió salinidad, temperatura del agua, concentración de oxígeno disuelto, concentración de clorofila a, biomasa y densidad del zooplancton; además se identificaron los organismos, en lo posible hasta especie. Los perfiles de temperatura mostraron un mayor...
Tipo: Journal article
Palavras-chave: Zooplancton; Densidad; Biomasa; Surgencia.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100008

Biomass partitioning and leaf area of Pinus radiata trees subjected to silvopastoral and conventional forestry in the VI region, Chile
Provedor de dados: 97
Autores: RODRÍGUEZ,ROLANDO; HOFMANN,GLENN; ESPINOSA,MIGUEL; RÍOS,DARCY.
The effects of silvicultural regimes on leaf area and biomass distribution were analyzed in 16-year old Pinus radiata trees growing in the semiarid zone of Chile. Three stands with different silvopastoral management were compared with a conventionally managed stand. Data were obtained through destructive sampling of 36 trees and analyzed by MANOVA and regression models of ANCOVA. Results show that the management regime affects the leaf area. Specific leaf area was affected by both silvicultural regime and crown position. Total biomass per tree under the silvopastoral regime was 2.1 to 2.5 times larger than in the conventional forestry regime. However, aboveground biomass partitioning was neither affected by the silvicultural regime nor by the schemes of...
Tipo: Journal article
Palavras-chave: Leaf area; Biomass; Silvopastoral management.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300008

Biomaterials Applied to the Bone Healing Process
Provedor de dados: 77
Autores: Nascimento,Cássio do; Issa,João Paulo Mardegan; Oliveira,Rafael Ramos de; Iyomasa,Mamie Mizusaki; Siéssere,Selma; Regalo,Simone Cecilio Hallak.
An recent innovation in medicine is the application of the biomaterials in bone healing process. Thus, this work has the objective to present an overview of the uses and insertions of these biomaterials and its components mostly used in the bone repair
Tipo: Journal article
Palavras-chave: Bone repair; Biomaterials; Cicatricial process.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400025

Biomechanical and ecological relationships of wing morphology of eight Chilean bats
Provedor de dados: 97
Autores: CANALS,MAURICIO; GROSSI,BRUNO; IRIARTE-DÍAZ,JOSE; VELOSO,CLAUDIO.
In this study we compared the wing morphology of eight species of bats inhabiting Chile, including two previous studied species. We correlated the results with ecological information. Aspect ratio, wing span, wing area, wing loading and the second moment of area of humerus midshaft were estimated for the molossid Mormopterus kalinowskii, the phyllostomidae Desmodus rotundus and the vespertilionids Histiotus montanus, Histiotus macrotus, Lasiurus borealis, and Lasiurus cinereus. The free-tailed bats T. brasiliensis and M.kalinowskii and D. rotundus, without uropatagyum, showed a low wing area, but whilst the molossids showed large aspect ratios, that of D. rotundus was only moderate. Desmodus rotundus showed the lowest wing span (relative to the expected...
Tipo: Journal article
Palavras-chave: Bats; Biomechanics; Flight.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200005

Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method
Provedor de dados: 77
Autores: Macedo,Ana Paula; Issa,João Paulo Mardegan; Defino,Helton Luiz Aparecido; Shimano,Antonio Carlos.
The objective of the present study was to validate virtual models for the study of dual core and cylindrical screws and evaluate the influence of the geometry of the screws on the mechanical behavior and anchoring. Two models of dual core screws were used, one with a double thread and the other with a single thread, both with a conventional cylindrical screw were used in this study. The stiffness was assessed in a pullout test using polyurethane. Three dimensional virtual models simulating the pullout test were created for finite element analysis. To validate the models, the results were correlated with the mechanical tests. Tensions generated in polyurethane and the screw were studied while simulating the application of force in the direction of the screw...
Tipo: Journal article
Palavras-chave: Bone screws; Spine fixation devices; Finite element analysis.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100050

Biomechanics of the Human Canine Pillar Based on its Geometry Using Finite Element Analysis
Provedor de dados: 77
Autores: Freire,Alexandre Rodrigues; Prado,Felippe Bevilacqua; Rossi,Ana Cláudia; Noritomi,Pedro Yoshito; Neto,Francisco Haiter; Caria,Paulo Henrique Ferreira.
This study evaluated the stress distribution based on the canine pillar geometry in human skull, using a finite element analysis. Computed tomography of human skull was used to build a finite element model, which was composed by all bony structures of canine pillar: canine eminence, canine fossa, frontal process of maxilla, glabellum and superciliary arch. A support on the bite contact of maxillary canine tooth and a resultant force of the masticatory muscles was applied in the simulation. Equivalent Von-mises and maximum principal stresses were analyzed along the structures that compose the canine pillar geometry. Von-mises stress presented high stress concentrated at the canine fossa and frontal process of maxilla. Maximum principal stress showed...
Tipo: Journal article
Palavras-chave: Skull; Biomechanics; Finite element analysis.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100036

Biomethrics Study of the Upper and Lower Labial Artery in Human Cadavers
Provedor de dados: 77
Autores: Aravena Torres,Pedro; Suazo Galdames,Iván; Cantín López,Mario; Troncoso Pazos,Jorge; Coronado Gallardo,César.
The face is richly vascularizad by various branches of the facial artery. Among them are the upper and lower lips branches irrigate the lips and cheeks. The purpose of this study was to analyze the biometric characteristics of labials arteries of human corses . It disected 18 human midfaces, preserved on the basis of formalin and the arterial system repleted with red latex. It noted the trail of the facial artery and the presence of the upper and lower labial arteries. Anatomical fixed points were established to measure the distribution pattern of facial artery in the facial region and the origin and route of the upper and lower labial arteries. Of the 18 analyzed samples, 100% labial arteries presented an independent origin of the artery facial with an...
Tipo: Journal article
Palavras-chave: Upper and lower labial artery; Facial artery; Biometric study.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300011

Biometría de Dientes Anteriores en Mestizos: Proporción largo/Ancho Intradental
Provedor de dados: 77
Autores: Ramirez,Luis Miguel; Ballesteros,Luis Ernesto; Preciado,Camilo José.
Las proporciones largo/ancho intradental han sido propuestas en más de once diferentes modelos a la fecha pero no se han estudiando en población mestiza Colombiana. Se utilizaron modelos de agrupamiento jerárquico (K-Means) para entender cual explica mejor la distribución de los datos. También se analizaron co-variables de sexo, edad y atrición leve para evaluar su influencia sobre la distribución general. Fueron utilizadas fotografías estandarizadas de dientes anteriores de 274 individuos de ambos sexos con dientes completamente erupcionados y sanos. Las mediciones fueron realizadas con programas informáticos calibrados (error de 0,05 mm). Se utilizó la prueba Chi Cuadrado para demostrar que las co-variables el sexo (valor de p= 0,09), edad (valor de p=...
Tipo: Journal article
Palavras-chave: Proporciones intradental; Dientes anteriores; Modelos; Mestizos.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300042

Biometría de las Arterias Comunicantes Posteriores y Cerebrales Posteriores en su Segmento Precomunicante (P1) en el Círculo Arterial del Cerebro (Willis)
Provedor de dados: 77
Autores: Mandiola,Eduardo; Alarcón,Eduardo; Oñate,Juan Carlos; Sanhueza,Pablo; del Sol,Mariano; Olave,Enrique.
El conocimiento anatómico y clínico preciso del círculo arterial del cerebro, se hace cada vez más necesario, por la compleja relación neural que presentan las diversas arterias que entran en su formación y además por su gran variabilidad. Utilizamos 36 encéfalos humanos frescos, provenientes de especímenes autopsiados adultos, cuyos datos bioantropológicos fueron previamente registrados. El calibre de las aa. comunicantes posteriores fue, en promedio, de 1,08 mm (DE 0,45 ) en ambos lados y su longitud de 17,51 mm( DE 7,9) en el lado derecho y de 16,9 mm (DE 8,0 ) en el lado izquierdo. La ACP en el segmento P1 presentó un calibre de 2,56 mm (DE 077) en el lado derecho y de 2,32 mm (DE 0,64) en el lado izquierdo. La longitud de estas arterias correspondió a...
Tipo: Journal article
Palavras-chave: Arteria cerebral posterior; Arteria comunicante posterior; Círculo arterial del cerebro.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500015

Biometría del "churrete austral", Cinclodes antarcticus (Garnot) en isla Gonzalo, archipiélago Diego Ramírez, sur de Chile
Provedor de dados: 72
Autores: Cursach,Jaime A; Suazo,Cristián G; Tobar,Claudio N; Rau,Jaime R.
Durante enero 2011 se registraron datos morfométricos y conductuales de Cinclodes antarcticus en isla Gonzalo, Diego Ramírez, sur de Chile. La longitud del pico fue significativamente mayor en machos respecto de hembras. C. antarcticus es un ave comensalista de colonias reproductivas de aves y mamíferos marinos de la Patagonia austral.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000200007

Biometric Study of the Bifurcations of the Popliteal Artery and the Tibiofibular Trunk
Provedor de dados: 77
Autores: Hirano,M. B; Teles,H. R; Macedo,T; Sgrott,E. A; Stuker,H; Olave,E; Moreira,R. S.
The popliteal artery is located deep inside the popliteal fossa, and is an important landmark in surgical procedures. Lesions of this vessel and its branches can be dangerous, blocking circulation to the lower limb and leading to gangrene or even vascular failure. The aim of this work was to describe the biometric characteristics of the bifurcations of the popliteal artery and the tibiofibular trunk in relation to the head of the fibula in 38 lower limbs through dissection. The bifurcation of the both arteries was present in all the cases. The mean confidence interval for the bifurcation of the popliteal artery was from 2.82 cm to 3.18 cm from the head of the fibula, and that of the bifurcation of the tibiofibular trunk was from 5.72 cm to 6.68 cm. The...
Tipo: Journal article
Palavras-chave: Anatomy; Lower limb; Popliteal region; Popliteal artery.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400041

Biometric Study of the Reproductive Organs of Three Breeds of Sheep in Nigeria
Provedor de dados: 77
Autores: Ibrahim,Abdullahi Ali; Aliyu,Jibril; Ashiru,Rabi Muhammad; Jamilu,Mustapha.
A comparative study of testicular biometry was done in rams using three major breeds of sheep in Nigeria. Biometrical parameters observed were scrotal circumference (SC), testes weight (TW), testes length (TL), tunica albuginea weight (TAW), testes volume (TV), testes density (TD), epididymal weight (EW), epididymal length (EL), caput (CA), corpus (CO), cauda weight (CU), epididymal volume (EV) and epididymal density (ED). The results showed significant differences (p&lt;0.05) between the Uda, Balami and Yankasa breed in the SC, TW, TV, EW, EL, CA, CO, CU, and EV. The Uda had significantly higher (p&lt;0.05) values in most of the parameters examined than the two other breeds. A bilateral symmetry was observed for Uda and Balami in testes weight and testes...
Tipo: Journal article
Palavras-chave: Sheep; Testicular; Epididymal; Breeds; Scrotal circumference.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400053

Biometrical Analyses of a Sicilian Green Toad, Bufo siculus (Stöck et al. 2008), Population Living in Sicily (Italy)
Provedor de dados: 77
Autores: Lo Valvo,Mario; Giacalone,Gabriele.
Morphometry structure of Sicilian green toad from the Nature Reserve "Monte Pellegrino" (north-western Sicily) was studied. A total of 666 individuals (354 males and 312 females) were captured in 2003 during reproduction period. Meaningful differences have statistically emerged among the two sexes and the body weight is the best parameter (up to 92% correct classification), followed by the length of the body (up to 90% correct classification). The simultaneous use of all the examined characters only increases of 1% the probability for correct discrimination of the sex. In comparison to the dimension of other green toad populations studied by other authors, the body size of this sicilian population results elevated, similar to that of Corsica and of...
Tipo: Journal article
Palavras-chave: Bufo siculus; Biometrical analysis; Sicily.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200055

Biometry of Hard Palate on Digital Photographs: A Methodology for Quantitative Measurements
Provedor de dados: 77
Autores: Saviolo Moreira,Rafael; Alexandre Sgrott,Emerson; Seiji,Fernando; Luiz Smith,Ricardo.
The objective of this paper is to establish, validate and test the reproducibility and accuracy of a digital method to measure linear and angular distances in human hard palate of dry skulls. Digital photographs were made in 10 human adult skulls and measurements were made with the aid of AutoCAD software and with a digital caliper in the same skulls by one observer in a blind fashion to compare both methods. To validate the digital method, measurements was made in 20 skulls by 3 observers. The differences of the measurements were not statistically significant between both method and between the 3 observers. The use of digital cameras followed by image analysis with AutoCAD, a software initially developed for engineering and architecture, revealed to be an...
Tipo: Journal article
Palavras-chave: Biometry; Palate; Digital photography; Anthropometry.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000100004

Biometry of the Skull of Wild and Farm Long-tailed Chinchilla (Chinchilla laniger, Molina, 1782)
Provedor de dados: 77
Autores: Baranowski,Piotr; Wróblewska,Magdalena; Nowak,Piotr; Pezinska,Katarzyna.
This study aimed at presenting the values of 47 metric traits and 20 cranial indices of the skull of 291 mature farm chinchillas and comparing these data with those being determined on 32 chinchilla skull specimens from the Natural History Museum in London. Measurements of the viscerocranium, neurocranium and mandible parameters were taken. No normal distribution of these traits was observed. The values of selected Spearman's rank correlation coefficients were calculated. It was found that most cranial traits of the farm chinchillas showed statistically significantly higher values (P0.01) when compared to those being determined on the skulls of museum specimens. The effect of the farm environment, in which the farm chinchillas had been kept for many...
Tipo: Journal article
Palavras-chave: Biometry; Chinchilla; Viscerocranium; Neurocranium; Skull.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300038

Bionanoparticles, a green nanochemistry approach
Provedor de dados: 69
Autores: Cauerhff,Ana; Castro,Guillermo R.
Background: In the past decade, considerable attention has been paid for the development of novel strategies for the synthesis of different kind of nano-objects. Most of the current strategies are usually working by the use physical or chemical principles to develop a myriad of nano-objects with multiple applications. Main fields of nanotechnology applications range from catalysis, micro- and nano-electronics (semiconductors, single electrons transistors), non-linear optic devices, photo-electrochemistry to biomedicine, diagnostics, foods and environment, chemical analysis and others. Results: Two main avenues for nanoparticles synthesis: cell-free extract and cell cultivation have been reported. The state of art of both biotechnological approaches for...
Tipo: Journal article
Palavras-chave: Bacteria; Bionanoparticles; Fermentation; Fungi green chemistry; Plant extracts.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300011

Bio-optical characteristics of phytoplankton populations in the upwelling system off the coast of Chile
Provedor de dados: 97
Autores: STUART,VENETIA; ULLLOA,OSVALDO; ALARCÓN,GADIEL; SATHYENDRANATH,SHUBHA; MAJOR,HEATHER; HEAD,ERICA J.H.; PLATT,TREVOR.
Phytoplankton samples collected from two cruises off the coast of Chile were analysed for pigment composition and absorption characteristics. High pigment concentrations (up to 20 mg chl-a m-3) were found in the upwelled waters over the shelf break off the coast of Concepción during spring (October 1998), but relatively oligotrophic conditions were found further offshore. Similarly, stations further north (between Coquimbo and Iquique), sampled during the austral summer (February 1999), also showed low pigment concentrations, characterised by the presence of prymnesiophytes, and cyanobacteria including Prochlorococcus sp. The specific absorption coefficient of phytoplankton at 443 nm (a*ph(443)) was much higher for the offshore population than the inshore...
Tipo: Journal article
Palavras-chave: Phytoplankton absorption; HPLC pigments; SeaWiFS ocean-colour; Chile.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000100008

Biophilosophical and epistemological problems in the study of living beings: Reflections on the views of Humberto Maturana
Provedor de dados: 48
Autores: SERANI-MERLO,ALEJANDRO.
Theories on the nature of living beings have been present in our culture since the beginnings of science and philosophy in ancient Greece. The two major theoretical approaches to living beings, philosophical mechanism and Aristotelian realism, appear today with renewed force in almost every confrontation concerning the theoretical considerations of life. In recent times a strong and prolific school of thought has risen, headed by the Chilean neurobiologist Humberto Maturana. This author and his school have developed a complex and articulated theoretical system beginning with a theory of living beings and a `biology of cognition,' and extending to ethical, political, and even metaphysical considerations. This work is one of the first efforts to perform a...
Tipo: Journal article
Palavras-chave: Biophilosophy; Determinism; Philosophical mechanism; Finality.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000300005

BIOPROSPECTING: A TOOL TO CONSERVE CHILEAN BRYOPHYTES
Provedor de dados: 73
Autores: Cuvertino-Santoni,Jorge; Montenegro,Gloria.
Here, we present the current state of knowledge on the diversity of Chilean bryophytes (mosses, liverworts, and hornworts), the secondary metabolites present in these plants, and the biological activity of extracts from populations of Chilean species. Our goal is to establish the potential of these plants as a source of useful molecules for pharmaceutical and agricultural industries, thus promoting their conservation. Only 3,7% of Chilean bryophytes (55 spp.) have been analyzed using chemical characterization of their extracts (methanol, ether, ethanol, dichloromethane, acetone and hexane). Only four species from Chilean and Argentinian populations (Porella chilensis (Lehm. &amp;amp; Lindenb.) Trevi., Riccardiapolyclada (Mitt. ex Thurn) Hässel,...
Tipo: Journal article
Palavras-chave: Mosses; Liverworts; Hornworts; Uses; Secondary metabolites; Biological activity; In vitro cultivation.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100002

Bioprospection of cellulolytic and lipolytic South Atlantic deep-sea bacteria
Provedor de dados: 69
Autores: Odisi,Estácio Jussie; Silvestrin,Marcela Bruschi; Takahashi,Rodrigo Yoji Uwamori; da Silva,Marcus Adonai Castro; Lima,André Oliveira de Souza.
Background: Cellulases and lipases have broad industrial application, which calls for an urgent exploration of microorganisms from extreme environments as valuable source of commercial enzyme. In this context, the present work describes the bioprospection and identification of deep-sea bacteria that produce cellulases and lipases, as well their optimal temperature of activity. Results: The first step of this study was the screening of cellulolytic and lipolytic deep-sea bacteria from sediment and water column, which was conducted with substrates linked with 4-Methylumbelliferyl. Among the 161 strains evaluated, 40 were cellulolytic, 23 were lipolytic and 5 exhibited both activities. Cellulolytic and lipolytic bacteria are more common in sediment than at...
Tipo: Journal article
Palavras-chave: Bacteria; Cellulases; Deep-sea; Lipases.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500018

Biosafety education relevant to genetically engineered crops for academic and non-academic stakeholders in East Africa
Provedor de dados: 69
Autores: Sengooba,Theresa; Grumet,Rebecca; Hancock,James; Zawedde,Barbara; Kitandu,Lazaro; Weebadde,Cholani; Karembu,Margaret; Kenya,Eucharia; Meredia,Karim; Nampala,Paul; Ochanda,James O; Quemada,Hector; Rubindamayugi,Mugassa.
Development and deployment of genetically engineered crops requires effective environmental and food safety assessment capacity. In-country expertise is needed to make locally appropriate decisions. In April 2007, biosafety and biotechnology scientists, regulators, educators, and communicators from Kenya, Tanzania, and Uganda, met to examine the status and needs of biosafety training and educational programs in East Africa. Workshop participants emphasized the importance of developing biosafety capacity within their countries and regionally. Key recommendations included identification of key biosafety curricular components for university students; collaboration among institutions and countries; development of informational materials for non-academic...
Tipo: Journal article
Palavras-chave: Biotechnology; Environmental safety; Kenya; Tanzania; Uganda.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000100001

Biosafety information management systems. A comparative analysis of the regulatory systems in Canada, Argentina, and Chile
Provedor de dados: 69
Autores: Flint,Jason; Irarrazabal,Carlos; Dellacha,Juan.
CamBioTec, a Canadian-Latin American Network promoting the safe and effective use of agricultural and environmental biotechnology, undertook an analysis of the current capacities of Argentina, Chile and Canada with respect to the management of information related to assessment and approval of products of modern biotechnology/ genetically engineering. This report is based on data obtained during a number of interviews and institutional visits conducted during August 1998 and includes: an overview of current regulatory policy, identification of key human resources and authorities, analysis of information management capacity, recommendations for capacity building, and descriptions of relevant international initiatives. Canada has a regulatory system in place...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000100002

Biosorption kinetics of a direct azo dye Sirius Blue K-CFN by Trametes versicolor
Provedor de dados: 69
Autores: Erden,Emre; Kaymaz,Yasin; Pazarlioglu,Nurdan Kasikara.
In this study, lyophilized Trametes versicolor biomass is used as a sorbent for biosorption of a textile dye, Sirius Blue K-CFN, from an aqueous solution. The batch sorption was studied with respect to dye concentration, adsorbent dose and equilibrium time. The effect of pH and temperature on dye uptake was also investigated and kinetic parameters were determined. Optimal initial pH (3.0), equilibrium time (2 hrs), initial dye concentration ( 100 mg l-1) and biomass concentration (1.2 mg l-1) were determined at 26ï¿½C. The maximum biosorption capacity (q max) of Sirius Blue K-CFN dye on lyophilized T. versicolor biomass is 62.62 mg/g. The kinetic and isotherm studies indicated that the biosorption process obeys to a pseudo-second order model and Langmuir...
Tipo: Journal article
Palavras-chave: Biosorbent; Biosorption; Direct dye; Kinetics; Sirius Blue K-CFN; Trametes versicolor.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200003

Biosorption of chromium (VI) from aqueous solutions by the husk of Bengal gram (Cicer arientinum)
Provedor de dados: 69
Autores: Ahalya,N; Kanamadi,R.D; Ramachandra,T.V.
The potential to remove Cr (VI) from aqueous solutions through biosorption using the husk of Bengal gram (Cicer arientinum), was investigated in batch experiments. The results showed removal of 99.9% of chromium in the 10 mgl-1 chromium solution, the biomass required at saturation was 1 g mg-1. Kinetic experiments revealed that the dilute chromium solutions reached equilibrium within 180 min. The biosorptive capacity of the (bgh) was dependent on the pH of the chromium solution, with pH 2 being optimal. The adsorption data fit well with the Langmuir and Freundlich isotherm models. The adsorption capacity calculated from the Langmuir isotherm was 91.64 mg Cr (VI)/g at pH 2. The adsorption capacity increased with increase in agitation speed and an optimum...
Tipo: Journal article
Palavras-chave: Agro-wastes; Bengal gram husk (bgh); Cicer arientinum; Chromium biosorption; Isotherms; Fourier transform infrared spectroscopy (FTIR).
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300005

Biosorption of chromium(III) by Sargassum sp. biomass
Provedor de dados: 69
Autores: Sala Cossich,Eneida; Granhen Tavares,Célia Regina; Kakuta Ravagnani,Teresa Massako.
Chromium is present in different types of industrial effluents, being responsible for environmental pollution. Traditionally, the chromium removal is made by chemical precipitation. However, this method is not completely feasible to reduce the chromium concentration to levels as low as required by environmental legislation. Biosorption is a process in which solids of natural origin are employed for binding heavy metals. It is a promising alternative method to treat industrial effluents, mainly because of its low cost and high metal binding capacity. In this work the chromium biosorption process by Sargassum sp. seaweed biomass is studied. Sargassum sp. seaweed, which is abundant in the Brazilian coast, has been utilized with and without milling. The work...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200008

Biosorption of heavy metals by Talaromyces helicus: a trained fungus for copper and biphenyl detoxification
Provedor de dados: 69
Autores: Romero,M. Cristina; Reinoso,Enso H.; Urrutia,M. Inés; Moreno Kiernan,Alejandro.
At present, it is common to observe environments with organic and inorganic pollution, defined as co-contamination. Most industrial and urban effluents releases both pollutant types, leading to a complex environmental problem, as the biota must be tolerant to both xenobiotics. T. helicus, an efficient strain to degrade biphenyl, was trained with high copper levels, and became co tolerant to cobalt, lead and cadmium when was cultured in their presence. The copper adaptation was the result of physiological mechanisms, and the activated biochemical processes conferred resistance to Cu2+ as well as to other heavy metals. Furthermore, the Cu2+ adaptation of the mycelium was also transferred to the spores, that removed twice as much copper from solution than...
Tipo: Journal article
Palavras-chave: Biodegradation; Biphenyl; Cocontaminated sites; Cotolerance; Metal sorption; Talaromyces helicus.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300009

Biosorption of heavy metals from waste water using Pseudomonas sp.
Provedor de dados: 69
Autores: Hussein,Hany; Ibrahim,Soha Farag; Kandeel,Kamal; Moawad,Hassan.
Biosorption experiments for Cr(VI), Cu(II), Cd(II) and Ni(II) were investigated in this study using nonliving biomass of different Pseudomonas species. The applicability of the Langmuir and Freundlich models for the different biosorbent was tested. The coefficient of determination (R²) of both models were mostly greater than 0.9. In case of Ni(II) and Cu(II), their coefficients were found to be close to one. This indicates that both models adequately describe the experimental data of the biosorption of these metals. The maximum adsorption capacity was found to be the highest for Ni followed by Cd(II), Cu(II) and Cr(VI). Whereas the Freundlich constant k in case of Cd(II) was found to be greater than the other metals. Maximum Cr(VI) removal reached around...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100006

Biosorption of hexavalent chromium using tamarind (Tamarindus indica) fruit shell-a comparative study
Provedor de dados: 69
Autores: Rao Popuri,Srinivasa; Jammala,Ajithapriya; Naga Suresh Reddy,Kachireddy Venkata; Abburi,Krishnaiah.
The adsorption of chromium (VI) ions from aqueous solutions has been investigated on crude tamarind fruit shell, HCl treated and Oxalic acid treated shells at room temperatures. The biosorbents are characterized by FT-IR, EDXRF and porosimetry. The biosorption experiments are conducted through batch system. The influence of different experimental parameters such as pH, effect of initial metal ion concentration and effect of dosage of adsorbent on biosorption are evaluated. The adsorption followed first order kinetics. The data are fitted well to Langmuir and Freundlich isotherm models. A comparison is drawn on the extent of biosorption between untreated and treated forms of the tamarind shells. Due to their outstanding adsorption capacities, tamarind...
Tipo: Journal article
Palavras-chave: Biosorption; Chromium (VI); Pre-treatment; Tamarindus indica fruit shell.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300003

Biosorption of lead by the brown seaweed Sargassum filipendula - batch and continuous pilot studies
Provedor de dados: 69
Autores: Mesquita Vieira,Denise; Augusto da Costa,Antonio Carlos; Assumpção Henriques,Cristiane; Luiz Cardoso,Vicelma; Pessôa de França,Francisca.
The biosorption of lead by the brown alga Sargassum filipendula was studied. pH 4.0 was the optimum value for the biosorption of lead. Isotherms indicated that for solutions containing 0.03 ± 0.001 up to 3.27 ± 0.04 mmol/L of lead, 2.0g/L was the optimum biomass concentration. The Langmuir model was fitted to represent the experimental data, and the kinetics of biosorption presented equilibrium in 30 min. The continuous system operated for 56 hrs presenting a 100% binding of ionic lead, which corresponds to an accumulation of 168 g lead, equivalent to a load of 1.7 mmol ionic lead/g Sargassum filipendula. The results that were obtained in a continuous system showed a gradual saturation of the biomass in the reactors
Tipo: Journal article
Palavras-chave: Biosorption; Biosorption equilibrium continuous system lead Sargassum filipendula.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300004

Biosorption of lead(II) and chromium(VI) on groundnut hull: Equilibrium, kinetics and thermodynamics study
Provedor de dados: 69
Autores: Qaiser,Suleman; Saleemi,Anwar R; Umar,Muhammad.
The biosorption of lead(II) and chromium(VI) on groundnut hull was investigated. Batch biosorption experiments were conducted to find the equilibrium time and biosorption capacity. Effect of parameters like pH, temperature and initial metal concentration was studied. The maximum biosorption capacity of lead(II) and chromium(VI) was found to be 31.54 ± 0.63 and 30.21 ± 0.74 mg g-1, respectively. The optimum pH for lead(II) and chromium(VI) removal was 5 ± 0.1 and 2 ± 0.1, respectively. The temperature change, in the range of 20 - 45ºC affected the biosorption capacity. The maximum removal of lead(II) was achieved at 20 ± 2ºC, where as maximum uptake of chromium(VI) was observed at 40 ± 2ºC. The biosorption data was fitted to the Langmuir and the Freundlich...
Tipo: Journal article
Palavras-chave: Biosorption; Equilibrium; Groundnut hull; Kinetics; Thermodynamics.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400003

Biosorption of uranium from aqueous solutions by nonliving biomass of marinealgae Cystoseira indica
Provedor de dados: 69
Autores: Hassan Khani,Mohammad; Reza Keshtkar,Ali; Meysami,Behrouz; Firouz Zarea,Mohammad; Jalali,Reza.
Biosorption of heavy metals can be an effective process for the removal and recovery of heavy metal ions from aqueous solutions. In this paper uranium biosorption by protonated, Ca-pretreated and non-pretreated Cystoseira indica algae biomass was investigated in a batch system. The results of the kinetic studies showed that the sorption of uranium on protonated and non-pretreated biomass followed pseudo-second order kinetics. The effect of pH on the equilibrium uranium sorption capacity of Cystoseira indica exhibited that highest uptake occurred at pH 4 at a solution with 350 mg/l uranium concentration. At various initial uranium concentrations from 50 to 1000 mg/l, batch sorption equilibrium at 30&amp;ordm;C was reached within 3 hrs and the sorption...
Tipo: Journal article
Palavras-chave: Biosorption; Cystoseira indica; Equilibrium; Kinetic; Marine algae; Uranium.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200003

BIOSTIMULATION OF AGRICULTURAL BIOBEDS WITH NPK FERTILIZER ON CHLORPYRIFOS DEGRADATION TO AVOID SOIL AND WATER CONTAMINATION
Provedor de dados: 126
Autores: Tortella,G.R; Rubilar,O; Cea,M; Wulff,C; Martínez,O; Diez,M.C.
Degradation of the insecticide chlorpynfos (160 a.i mg kg-1) using a biomix of a biobed system biostimulated with inorganic fertilizer (NPK) was investigated. Three concentrations of the fertilizer (0.1%, 0.5% and 1.0% ww-1) were evaluated on chlorpynfos degradation, TCP (3, 5, 6-trichloro-2-pyrinidol) accumulation and biological activity of the biomix. The chlorpynfos was dissipated efficiently (&gt;75%) after 40 days of incubation and no additional dissipation was obtained with increasing concentration of NPK after 20 days of incubation. TCP accumulation occuned in all evaluated NPK concentrations and its concentration increased with the increment of NPK addition raising the probability of leaching of this compound. Biological activity (FDA and...
Tipo: Journal article
Palavras-chave: Chlorpyrifos; Bio stimulation; NPK fertilizer; Biobed; Andisol.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000200007

Biotechnological processes for chitin recovery out of crustacean waste: A mini-review
Provedor de dados: 69
Autores: Gortari,María Cecilia; Hours,Roque Alberto.
Background: Chitin is an important natural resource. The annual worldwide production is estimated in approximately 10(10)-10(12) ton. It is produced by arthropods (insects and crustaceans), molluscs and fungi. Its main biological function is structural. Crustacean shells are the most important chitin source for commercial use due to its high content and ready availability. Chitin and its derivatives have great economical value because of their numerous applications: food, cosmetics, pharmaceuticals, textile industries, waste water treatment and agriculture. In nature, chitin is closely associated with proteins, minerals, lipid and pigments, which have to be removed. Results: Several techniques to extract chitin from different sources have been reported....
Tipo: Journal article
Palavras-chave: Biological extraction; Chitin production; Crustacean waste.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300014

Biotechnology and Development: A balance between IPR protection and benefit-sharing
Provedor de dados: 69
Autores: Wendt,Jan; Izquierdo,Juan.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300001

Biotechnology and Human Development in Developing Countries
Provedor de dados: 69
Autores: Doelle,Horst W.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300002

Biotechnology and the developing world
Provedor de dados: 69
Autores: DaSilva,Edgar J.; Baydoun,Elias; Badran,Adnan.
The life sciences offer opportunities for revolutionizing human welfare activities. Enriched by inputs from genomic research, biotechnology is a major force for development in all countries. Entwined with culture and socio-ethical values, biotechnology contributes to solving problems like food and water insecurity that impede national development and threaten peace in the developing world. The lack of facilities and professional skills in biotechnology limits R &amp;amp; D initiatives in the developing and the least developed countries (LDCs); and, restricts their full participation in take-off activities in national and self-reliant regional ventures in sustainable development. The practice of biotechnology different in many developing countries is...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100013

Biotechnology, bioethics and the poor
Provedor de dados: 69
Autores: Bhardwaj,Minakshi.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300004

Biotechnology Education in Schools
Provedor de dados: 69
Autores: Harms,Ute.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300003

Biotechnology in Argentine agriculture faces world-wide concentration
Provedor de dados: 69
Autores: Varela,Liliana; Bisang,Roberto.
In the 1980s, the technical pattern of production in agriculture changed due to the increasing design of genetically modified plants. Modern biotechnology thrived on events requiring certain thresholds of scientific and technological skills as well as scale economies usually seen in developed countries. The mergers and acquisitions during the mid-1990s led to a world-wide oligopoly composed of very few agri-biotechnological mega-corporations and the literature discusses the impact of the mergers and acquisitions on the agriculture of developing countries with comparative advantages in agriculture. This paper analyzes the world-wide process of agri-biotechnological mega-corporation mergers and acquisitions as well as its impact and interrelationships with...
Tipo: Journal article
Palavras-chave: Internalization; Local adaptation; Mergers and acquisitions; Multinationals.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300010

Biotechnology in Developing Countries: Harnessing the Potential of High-TECH SMES in the Face of Global Competition
Provedor de dados: 69
Autores: Bustamante,Pedro I.; Bowra,Steve.
In the global market, the emergence of new technologies are representing opportunities and challenges to both industry and the public sector of the Latin American Countries (LAC). Some of these technologies have far reaching implications for a large number of industrial sectors, creating wealth and employment, resulting in an increased competitiveness of the developed economies around the world. Modern biotechnology is one of these key emerging technologies which LAC must harness successfully to sustain economic growth and competitiveness. The ability to commercially exploit research in this area is also of prime importance. Developed countries have made important progress in recent years, with a strong leadership of USA in this sector. Unless substantial...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300001

Biotechnology in Mauritius: current status and constraints
Provedor de dados: 69
Autores: Puchooa,Daneshwar.
Agriculture today faces the challenge of sustainable productivity and improved food security on a shrinking area of land under cultivation. Until recently, biotechnology has been viewed as an expensive technology affordable only by rich industrial countries. However, it is now increasingly considered as an essential tool for developing countries to tackle the numerous problems of underdevelopment. Unfortunately, to date, Mauritius, like many other countries in Africa, lags far behind in development, use and commercialisation of biotechnology. This paper outlines the current status of biotechnology in Mauritius, some important constraints faced, as well as how policy makers are planning to make Mauritius &amp;ldquo;assume the role of a service provider and...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200004

Biotechnology Issues for Developing Economies
Provedor de dados: 69
Autores: Johnson,D. Gale.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100002

Biotechnology Issues in Africa
Provedor de dados: 69
Autores: Egwang,Thomas G.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300005

Biotechnology research in Venezuela: Five case studies
Provedor de dados: 69
Autores: Morales,Rosa.
The organization of biotechnology differs across countries. The structure of the industry, the academia, and the links between these two sectors vary according to which country is studied. Biotechnology is organized in Venezuela mainly around the research done by special research and development units at national universities. The paper describes some of these units in order to shed light about their performance. Two economic approaches are used to explain the academic production of these biotech research organizations: the technological and organizational approaches. A case study methodology is used in this research. The results can be summarized as: The percentage of researchers who are doctors is less than seventy percent in each research and...
Tipo: Journal article
Palavras-chave: Human capital; Latin American biotechnology; Research and development units; Organization of biotechnology.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500001

Biotipo Morfológico Facial en Tres Grupos Étnicos Colombianos: Una Nueva Clasificación por Medio del Índice Facial
Provedor de dados: 77
Autores: Bedoya,A; Osorio,J. C; Tamayo,J. A.
El objetivo de este estudio es evaluar el índice facial de tres poblaciones colombianas y proponer un nuevo método para identificar los biotipos morfológicos faciales teniendo en cuenta el tipo de ascendencia. Para esto, se tomaron las medidas de Nasion a Gnation y la distancia Bicigomática con un calibrador digital en tres grupos étnicos diferentes: 63 niños de la población Ticuna (Amazonas), 68 niños del municipio de Puerto Tejada (Cauca) y 65 niños del municipio de Santiago de Cali (Valle). Por medio de la prueba post hoc T2 de Tamhane se determinó que las poblaciones son distintas y que el índice morfológico facial tradicional no discriminaba esas diferencias. Por tal razón se utilizó el método estadístico de conglomerados difusos con el fin de...
Tipo: Journal article
Palavras-chave: Biotipo; Ascendencia; Índice facial; Conglomerados difusos.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200053

Biotransformation of 1,8-cineole, the main product of Eucalyptus oils
Provedor de dados: 69
Autores: Rodríguez,Paula; Sierra,Wilson; Rodríguez,Sonia; Menéndez,Pilar.
The forest industry in Uruguay has grown considerably during the last decade. Eucalyptus plantations account for 74% of the forested land, with Eucalyptus globulus being the most widely distributed species. This industry is dedicated exclusively to the production of wood without exploiting the by-products (leaves and small branches). Eucalyptus leaves are known to contain important amounts of essential oils composed primarily of 1,8-cineole (1,3,3-trymethyl-2-oxabicyclo[2.2.2]octane). In this work, the biotransformation of 1,8-cineole, is achieved using a native bacterium (Rhodococcus sp.) which was isolated from the soil of Eucalyptus forest. A 98% of bioconversion was achieved. Three different optically pure compounds were obtained, and they were...
Tipo: Journal article
Palavras-chave: Biocatalysis; Monoterpenes; Eucalyptus; Green Chemistry.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300011

Biotransformation of 3-hydroxydibenzo-&amp;#945;-pyrone into 3,8 dihydroxydibenzo-&amp;#945;-pyrone and aminoacyl conjugates by Aspergillus niger isolated from native&amp;#8220;shilajit&amp;#8221;
Provedor de dados: 69
Autores: Islam,Aminul; Ghosh,Runa; Banerjee,Dipankar; Nath,Piali; Mazumder,Upal Kanti; Ghosal,Shibnath.
&amp;#8220;Shilajit&amp;#8221; is a panacea in Ayurveda, the Indian traditional system of medicine. The major bioactives of &amp;#8220;shilajit&amp;#8221; have been identified as dibenzo-&amp;#945;-pyrones (DBPs), its oligomers and aminoacyl conjugated derivatives. These bioactive compounds play a crucial role in energy metabolism in all animal cells including those of man. 3-hydroxydibenzo-&amp;#945;-pyrone (3-OH-DBP), a key DBP component of &amp;#8220;shilajit&amp;#8221; is converted, among other products, to another active DBP derivative, viz. 3,8-hydroxydibenzo-&amp;#945;-pyrone, 3,8(OH)2-DBP, in vivo, when its precursor is ingested. 3,8(OH)2-DBP is then involved in energy synthesis in the mitochondria in the reduction and stabilization of coenzyme Q10...
Tipo: Journal article
Palavras-chave: Coenzyme Q10 reduction; Electron transport chain humification; Paleohumus.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300001

Biotransformation of anthracene and fluoranthene by Absidia fusca Linnemann
Provedor de dados: 69
Autores: Villemain,Danièle; Guiraud,Pascale; Bordjiba,Ouahiba; Steiman,Régine.
A strain of Absidia fusca was isolated from a pesticide-contaminated soil (Annaba, Algeria). The biotransformation capability of this strain towards two polycyclic aromatic hydrocarbons (PAHs): anthracene and fluoranthene was compared to that exhibited by another strain of A. fusca isolated from a non-contaminated milieu and considered as a control. The results obtained were statistically analyzed and showed that the strain isolated from the contaminated soil was more efficient than the control to remove anthracene from the medium, during all the kinetics (90% removed versus 45% after 24 hrs). Concerning fluoranthene, the amount removed by both strains was very high during the first 24 hrs however the control strain was slightly more efficient (94% versus...
Tipo: Journal article
Palavras-chave: Absidia fusca; Anthracene; Biodegradation; Fluoranthene; Kinetics.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200004

Biotransformation of (L)-citronellal to (L)-citronellol by free and immobilized Rhodotorula minuta
Provedor de dados: 69
Autores: Velankar,Harshad Ravindra; Heble,Mohan Ram.
This paper reports biotransformation of (L)-citronellal to (L)-citronellol using free and immobilized cells of Rhodotorula minuta. The culture preparation variables such as pH, temperature and incubation period for obtaining maximum cell growth of R. minuta were optimized. The optimized culture conditions for free and immobilized cells of R. minuta. have been compared for (L)-citronellal biotransformation. The various factors such as the optimum substrate concentration and the time of substrate addition at varying cell concentrations during the growth of yeast culture were also studied. Highest (L)-citronellol concentration of 3.5 gl-1 was obtained with free cell catalyzed biotransformation at pH 5.5, 27ºC and 150 rpm after 8 hrs using initial...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200004

Bizygomatic Width and its Association with Social and Personality Traits in Males
Provedor de dados: 77
Autores: Gabarre-Mir,Julián; Navarro-Pastor,José B; Gabarre-Armengol,Cristina; Estaún-Ferrer,Santiago.
This study will examine how differences in measurements between bizygomatic and bigonial arches of the human face can provide relevant information regarding personality and abilities of the subject. Sample: 82 males. Group A: 55 subjects with the bizygomatic arch in contraction. Group B: 27 subjects without the bizygomatic arch in contraction. Subjects performed self-assessment tests in the following areas: ability incorporating themselves into the group, alexithymia and emotional expressiveness. Group A showed greater self-sufficiency and independence than group B, greater difficulty in describing and verbally expressing their emotions, less ability to express themselves emotionally through other forms of communication and reduced willingness to cooperate...
Tipo: Journal article
Palavras-chave: Bizygomatic width; Craniofacial; Personality; Alexithymia; Prospective ex post facto study.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300036

BJ-1108, a 6-Amino-2,4,5-trimethylpyridin-3-ol analogue, regulates differentiation of Th1 and Th17 cells to ameliorate experimental autoimmune encephalomyelitis
Provedor de dados: 48
Autores: Kang,Youra; Timilshina,Maheshwor; Nam,Tae-gyu; Jeong,Byeong-Seon; Chang,Jae-Hoon.
Abstract  Background  CD4+ T cells play an important role in the initiation of an immune response by providing help to other cells. Among the helper T subsets, interferon-&amp;#947; (IFN-&amp;#947;)-secreting T helper 1 (Th1) and IL-17-secreting T helper 17 (Th17) cells are indispensable for clearance of intracellular as well as extracellular pathogens. However, Th1 and Th17 cells are also associated with pathogenesis and contribute to the progression of multiple inflammatory conditions and autoimmune diseases.  Results  In the current study, we found that BJ-1108, a 6-aminopyridin-3-ol analogue, significantly inhibited Th1 and Th17 differentiation in vitro in a concentration-dependent manner, with no effect on proliferation or apoptosis of activated T...
Tipo: Journal article
Palavras-chave: BJ-1108; Th1/Th17 cell; Differentiation; EAE.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100202

Blind Test of Mandibular Morphology with Sex Indicator in Subadult Mandibles
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Zavando Matamala,Daniela Alejandra; Smith,Ricardo Luiz.
Loth &amp;amp; Henneberg (2001) indicated that it was possible determine the sex with a high degree of accuracy (81 %) in mandibles of children by observing the shape of the mandibular body. The purpose of this study was to evalúate in mandibles of Brazilians subadults the proposed method consistency; were used mandibles of 33 Brazilian children between 0 and 1 year of age, known sex, belonging to the coUection of skulls of the Federal University Sao Paulo (UNIFESP). We performed a blind test in two sessions by one observer based on the parameters descnbed by Loth &amp;amp; Henneberg. The results show between 57.5 and 60.5% of accuracy, being the most sensitive test for determining male (70%) than for females (38-46%). The results presented are lower than...
Tipo: Journal article
Palavras-chave: Sexual dimorphism; Determination of sex; Subadults; Mandible.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400011

Body Asymmetries in Young Male Road Cyclists
Provedor de dados: 77
Autores: Rauter,Samo; Vodicar,Janez; Simenko,Jozef.
An anthropometric analysis was conducted on 64 competitive young male road cyclists of different age categories (U17; U19; &amp;amp; U23 years of age). The purpose of the study is to find asymmetries between the left and right side of upper and lower limbs with the NX-16 (TC2) 3D body scanner, which includes measurement of left and right upper arm girth, elbow girth, forearm girth, wrist girth, thigh girth, knee girth, thigh length, calf girth, and shin length. Body composition was measured by the bioelectrical impedance machine InBody 720 (Biospace Ltd.). Results of body composition measurements of male road cyclists showed that U17 and U19 youth road cyclist differed statistically in five (from 11) paired variables, and the U23 age group differed...
Tipo: Journal article
Palavras-chave: Morphology; Anthropometry; Circumferences; Cycling; Symmetry.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300018

Body Composition Comparisons by Age Groups in Hungarian Adults
Provedor de dados: 77
Autores: Ihász,Ferenc; Finn,Kevin J; Lepes,Josip; Halasi,Sabolc; Szabó,Péter.
The assessment of body composition provides a basis for evaluating changes in adults as they age. If the fat content is shown to be too high, intervention to reduce storage fat is warranted. The purpose of this paper is to report differences in body composition in men and women across three age groups (young, middle aged, older) to describe potential changes in both fat and muscularity. In addition, if fat storage is shown to be located in the visceral area (around the internal organs), then an addition risk to health would be evident. A total of 1564 Hungarian adults were tested for body mass index (BMI) and body composition using a multi-frequency electrical impedance device to determine percent body fat (PBF), percent muscularity (M%), and visceral fat...
Tipo: Journal article
Palavras-chave: Body composition; Age groups; Males; Females.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300007

Body Composition Features in Different Playing Position of Professional Team Indoor Players: Basketball, Handball and Futsal
Provedor de dados: 77
Autores: Ramos-Campo,Domingo Jesús; Martínez Sánchez,Fernando; Esteban García,Paula; Rubio Arias,Jacobo Ángel; Bores Cerezal,Antonio; Clemente-Suarez,Vicente Javier; Jiménez Díaz,José Fernando.
The aim of the present research was to analyze the body composition (BC) and the differences in BC among different playing position in professional basketball, handball and futsal players. BC was assessed in 70 professional indoor team sport players. Players were divided in 4 groups depending on the playing position: group 1, point guard, center/wings and defense; group 2, shooting guard/small forward, handed and midfielder; group 3, power forward/center, pivot and forward; and group 4 goalkeeper. Significant differences between playing positions in basketball in body mass (BM), height, proteins, minerals and arms, legs and trunk BM were found. In handball, significant differences between center/wings and pivot in BM and muscle mass, and between...
Tipo: Journal article
Palavras-chave: Fat mass; Height; Performance; Body mass.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400032

Body Height and Its Estimation Utilizing Arm Span Measurements in Serbian Adults
Provedor de dados: 77
Autores: Popovic,Stevo; Bjelica,Dusko; Molnar,Slavko; Jaksic,Damjan; Akpinar,Selcuk.
Anthropologists recognized the tallness of nations in the Dinaric Alps long time ago. As the modern Serbians fall more into the Dinaric racial classification than any other does, the purpose of this study was to examine the body height in Serbian adults as well as the relationship between arm span as an alternative to estimating the body height, which vary in different ethnic and racial groups. The nature and scope of this study analyzes 394 students (318 men, aged 20.13±1.47 and 76 women, aged 19.59±1.46) from the University of Novi Sad to be subjects. The anthropometric measurements were taken according to the protocol of the ISAK. Means and standard deviations were obtained. A comparison of means of body heights and arm spans within each gender group...
Tipo: Journal article
Palavras-chave: Prediction; Standing height; Stature; Armspan; Serbia.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100043

Body mass and body weight: a dual reference system in biology
Provedor de dados: 97
Autores: GÜNTHER,BRUNO; MORGADO,ENRIQUE.
ABSTRACT The aim of the present study was to compare two different biological similarity criteria, one was based on body mass (M) as a theoretical reference system in accordance with the MLT-system of physics, while the other utilized the body weight (W) for the same purpose. The mass-dependent allometry should be applied during space flights as well as during fetal and newborn conditions of life, whereas the weight-dependence should prevail in earth-bound physiology. The above mentioned distinctions are relevant not only for the specific metabolic rates but also for numerous biological time functions, as for instance for the heart and respiratory rates of all mammals, whose allometric exponent is b = - 0.09 during fetal life, and b = - 0.25 in all adult...
Tipo: Journal article
Palavras-chave: Dimensional analysis; Biological similarity; Allometry; Biological time; Fetal life; Space physiology.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000100006

Body mass and wing geometric morphology of the codling moth (Lepidoptera: Tortricidae) according to sex, location and host plant in the region of Maule, Chile
Provedor de dados: 118
Autores: Torres,Fabiola; Rodríguez,Marcela A; Lavandero,Blas; Fuentes-Contreras,Eduardo.
Codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), is the key pest of apple and walnut production worldwide. Among other variables, successful management of this pest is dependent on adult dispersal at the local scale. Body mass and wing geometric morphology were evaluated on female and male codling moth adults collected from apple and walnut trees in three localities of the Region of Maule. Codling moth adults were obtained by rearing diapausing larvae collected from the field. Newly emerged adults were killed, and the total dry weight, thorax weight and abdomen weight were calculated. The wings were cleared and mounted for morphometric analyses: 15 and 11 characteristics of the fore and hind wings, respectively, were measured, including the...
Tipo: Journal article
Palavras-chave: Apple; Aspect ratio; Cydia pomonella; Landmark-analysis; MorphoJ; Walnut; Wing loading.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000300008

Body Mass Index and Volume of Fat Tissue of Unemployed Men in the Tuzla Canton
Provedor de dados: 77
Autores: Kapidzic,Alen; Hasukic,Sefik; Mehinovic,Jasmin; Atikovic,Almir; Mujanovic,Amra Nozinovic; Mujanovic,Edin.
The main objective of this study was to obtain information on indicators of obesity among the unemployed male subjects from the Tuzla Canton. Also, we wanted to determine whether there are significant differences in the observed parameters between subjects in relation to age. The main criterion for the selection of test subjects is that they are unemployed. This is because we felt that those persons have more free time for practicing sports and recreational activities, and there is a very small number of studies in the area of Tuzla Canton with the characteristics of the sample. For the purpose of this research we applied analysis of percentage/ratio, t-test for independent samples and the Mann-Whitney U Test. Applied analysis showed that the increased...
Tipo: Journal article
Palavras-chave: Body Mass Index; Fat Tissue; Unemployed Men.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100025

Body mass variation in the Geoffroy's cat (Oncifelis geoffroyi)
Provedor de dados: 97
Autores: LUCHERINI,MAURO; MANFREDI,CLAUDIA; LUENGOS,ESTELA; DIAS MAZIM,FÁBIO; SOLER,LUCÍA; CASANAVE,EMMA B.
We report new data on the intersexual and geographical variation in body mass of the Geoffroy's cat (Oncifelis geoffroyi d'Orbigny and Gervais 1844), a little known small cat from South America, and combine them with the existing information to compare alternative hypotheses for variation in body mass. Most data on the body mass of O. geoffroyi have been obtained from previous research on this felid in four study areas of southern Brazil and central and southern Argentina. These data were added to those reported for other three additional locations. Our results set the body mass of O. geoffroyi to 4.26 ± 1.03 kg (mean ± SD, n = 56). We also show that males generally are heavier than females throughout most of this species' distributional range. Body mass...
Tipo: Journal article
Palavras-chave: Carnivores; Felids; Oncifelis geoffroyi; South America; Body mass.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200003

Bofedales: high altitude peatlands of the central Andes
Provedor de dados: 97
Autores: SQUEO,FRANCISCO A; WARNER,BARRY G; ARAVENA,RAMÓN; ESPINOZA,DIANA.
There is an exceptional group of alpine peatlands in the world situated in the arid grasslands of the central Andes. The peatlands in northern Chile occur in the most arid part of their range. Members of the Juncaceae are the primary peat-forming plant species. Fresh and mildly saline groundwaters originate from glaciers, snowmelt and rain are the water sources for the northern Chile peatlands. Paleoecological investigations suggest that some peatlands are recent features of the landscape having developed within the last three thousand years or less. These peatlands are unique, extremely fragile water features sensitive to climate changes and human disturbances such as regional mining activity. Much more work is required to develop scientifically based...
Tipo: Journal article
Palavras-chave: Peatlands; Arid grasslands; South America.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200010

Bone Augmentation With Occlusive Barriers and Cortical Particulate Allograft in Transverse Maxillary Defects: A Pilot Study
Provedor de dados: 77
Autores: Beltrán,Víctor; Engelke,Wilfried; Fuentes,Ramón; Decco,Oscar; Prieto,Ruth; Wilckens,Mario; Borie,Eduardo.
The centripetal resorption of maxilla is a continuous process after tooth loss. For treatment of deficient bone sites, autologous bone grafts may be used, as an alternative, biomaterials can be applied which do not require intra or extraoral donor sites. The present report describes the use of occlusive barriers and cortical particulate allograft in transverse maxillary defects. This surgical approach was performed in five patients (4 females and 1 male, aged 20 to 37 years). Clinical results show that sufficient hard tissue was formed to allow implant born rehabilitation in the former insufficient bone sites. Histological evaluation revealed small amounts of newly formed bone with a predominance of collagen fibrous tissue and mature bone with very little...
Tipo: Journal article
Palavras-chave: Bone regeneration; Maxilla; Dental implant; Bone defect; Biomaterials.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100057

BONE DEVELOPMENT OF BROILER CHICKENS FED DIETS WITH DIFFERENT AMINO ACID AND CALCIUM LEVELS DURING THE STARTER PHASE
Provedor de dados: 77
Autores: Soares da Silva Araújo,Cristiane; Martinez Baraldi Artoni,Silvana; Francelino Araújo,Lúcio; Jeferson Quirino Lousada,Mário; Mack Junqueira,Otto; Roque Rodriguez,Anita Isabel.
Two experiments were conducted in order to evaluate the effects of different dietary amino acid and calcium profiles on the bone characteristics of two chicken strains (Avian Farms and Cobb) during the starter phase. At the end of each experiment, 2 chickens of each replicate were sacrificed and their tibiae were collected for analysis of following bone characteristics: bone measurements (weight, length and thickness of the compact and spongy layers) and bone density (bone densitometry). A total of 540 birds were used in each experiment, divided into fully randomized blocks with a 3 x 2 factorial schemes, i. e., 3 amino acid profiles (methionine, lysine and threonine &amp;shy; 100%, 125% and 150% of NRC recommendations, 1994) and 2 calcium levels (75% and...
Tipo: Journal article
Palavras-chave: Amino acid; Bone density; Broiler chickens; Calcium.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000200001

Bone Formation in Maxillary Sinus Lift Using Autogenous Bone Graft at 2 and 6 Months
Provedor de dados: 77
Autores: Duque Netto,Henrique; Miranda Chaves,Maria das Graças Alfonso; Aatrstrup,Beatriz; Guerra,Renata; Olate,Sergio.
The aim of this study is to compare the bone formation in maxillary sinus lift with an autogenous bone graft in histological evaluation at 2 or 6 months. A comparative study was designed where 10 patients with missing teeth bilaterally in the posterior zone of the maxilla were selected. Patients received a particulate autogenous bone graft under the same surgical conditions, selecting a site to collect a biopsy and histological study at two months and another at six months postoperatively. Histomorphometry was performed and were used Kolmogorov-Smirnov test, student's t-test and Spearman's correlation coefficient, considering a value of p&lt;0.05. Differences were observed in inflammatory infiltrate and vascularization characteristics; however, the group...
Tipo: Journal article
Palavras-chave: Maxillary sinus; Maxillary sinus lift; Autogenous graft.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300041

Bone Healing in Transverse Maxillary Defects with Different Surgical Procedures Using Anorganic Bovine Bone in Humans
Provedor de dados: 77
Autores: Beltrán,Victor; Matthijs,Andries; Borie,Eduardo; Fuentes,Ramón; Valdivia-Gandur,Iván; Engelke,Wilfried.
The centripetal resorption of maxilla is a continuous process after tooth loss. For treatment of deficient bone sites, autologous bone grafts may be used, as an alternative, biomaterials can be applied which do not require intra- or extraoral donor sites. The present report we describe the use of anorganic bovine bone (ABB) based on three case reports under different modes: Membrane, rigid barrier and connective tissue graft. Clinical results show that under all conditions, sufficient hard tissue was formed to allow implant born rehabilitation in the former insufficient bone sites. Histologic evaluation revealed trabecular bone in an almost mature matrix with resting particles of ABB. Depending on the original site situation, two step rigid occlusive...
Tipo: Journal article
Palavras-chave: Bone regeneration; Maxilla; Dental implant; Bone defect; Biomaterials.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100011

Bone resorptive activity of osteoclast-like cells generated in vitro by PEG-induced macrophage fusion
Provedor de dados: 48
Autores: Murillo,Andrea; Guerrero,Carlos A; Acosta,Orlando; Cardozo,Carmen A.
Normal bone remodeling is maintained by a balance between osteoclast and osteoblast activity, whereas defects in osteoclast activity affecting such balance result in metabolic bone disease. Macrophage-macrophage fusion leading to multinucleated osteoclasts being formed is still not well understood. Here we present PEG-induced fusion of macrophages from both U937/A and J774 cell lines and the induced differentiation and activation of osteoclast-like cells according to the expression of osteoclast markers such as tartrate resistant acid phosphatase (TRAP) and bone resorptive activity. PEG-induced macrophage fusion, during the non-confuent stage, signifcantly increased the osteoclastogenic activity of macrophages from cell lines compared to that of...
Tipo: Journal article
Palavras-chave: Bone resorption; Macrophage fusion; Osteoclast activity; Osteoclast differentiation; PEG; RANKL.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000200009

Borage (Borago officinalis L.) Response to N, P, K, and S Fertilization in South Central Chile
Provedor de dados: 117
Autores: Berti,Marisol T.; Fischer,Susana U.; Wilckens,Rosemarie L.; Hevia,María F.; Johnson,Burton L.
Borage (Borago officinalis L.) is an oilseed with a high gamma-linolenic acid (GLA) content in its seed. The objective of this study was to determine the response of borage seed yield, oil content, and fatty acid composition to N, P, K, and S fertilizer treatments. Three experiments were conducted in Osorno (40º22’ S, 73º04’ W; 72 m.a.s.l.), Chile. The first experiment was conducted during the 2005-2006 growing season, with four N rates (0, 100, 200, and 300 kg N ha-1), three P rates (0, 60, and 120 kg P2O5 ha-1) and two K rates (0 and 150 kg K2O ha-1). The second experiment was conducted in 2006-2007 and evaluated only the effect of four N rates (0, 50, 100 and 150 kg N ha-1) was evaluated because there was no response to P and K in the first experiment....
Tipo: Journal article
Palavras-chave: Seed yield; Gamma-linolenic acid.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200006

Boroa-INIA, Primera Variedad de Lupino (Lupinus albus) Amargo Exportable Obtenida en Chile
Provedor de dados: 113
Autores: Mera,Mario; Galdames,Rafael.
El lupino blanco (Lupinus albus L.) amargo es cultivado en el sur de Chile por pequeños agricultores, en su mayoría Mapuches, y se exporta para consumo humano a países europeos y árabes. Ambos mercados ofrecen mejor precio por granos de mayor tamaño, aunque el europeo es más exigente. La variedad Boroa-INIA proviene de una planta individual colectada en la Región de La Araucanía (37º30’-39º30’ S). Es un lupino blanco de hábito de crecimiento indeterminado, perteneciente al tipo conocido como “Local”. Lupinos amargos llamados “alto-calibre”, introducidos en los noventa, son muy interesantes por su tamaño, pero más susceptibles a la antracnosis y de menor rendimiento que el tipo “Local”. La principal característica de la variedad Boroa-INIA es su buen peso...
Tipo: Journal article
Palavras-chave: Peso de grano; Calibre; Exportación; Agricultura familiar campesina.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000300011

Boron as Testicular Toxicant in Mice (Mus domesticus)
Provedor de dados: 77
Autores: Bustos-Obregón,Eduardo; Olivares,Christopher.
It has been reported that boron causes changes in various systems, including the male reproductive system. Residents in some towns in northern Chile were consuming a few years ago in the drinking water 20 times more than the amount established as permissible limit by WHO. This study evaluates the effects in an animal model of high intake of boron on the testis. Boron was administered in the drinking water. Twenty male mice (Mus domesticus), sexually mature, were used, divided into 2 groups: the experimental group was given Boron at a dose of 12 mg/L, and the control group 0.6 mg/L, for 42 days. Sections of testis were obtained for: HE staining (Morphometry and Histopathology), Immunohistochemistry (Cox-2), Mallory and Picrosirious stain (evaluation of...
Tipo: Journal article
Palavras-chave: Boron; Mouse; Testicular structure; Collagen I/III; Infertility.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300057

Boron dynamics related to fruit growth and seed production in kiwifruit (Actinidia deliciosa, cv. Hayward)
Provedor de dados: 118
Autores: Sotomayor,Carlos; Norambuena,Paulina; Ruiz,Rafael.
The effect of foliar boron treatments on fruit growth and seed development in Actinidia deliciosa, cv. Hayward, was studied. The distal leaves (BH) or fowers (BF) of a shoot were sprayed with 500 mg L-1 boric acid during the fowering period. The mobility of boron from the leaves to the fowers through the phloem was determined by spraying only the leaves. From 0 to 96 h after treatment, leaves and fowers were sampled and total boron was assessed. At harvest time, fruit weight and diameter plus seed weight and number were measured for the different treatments. The weight of fruits growing from shoots with boron-treated leaves were 14.1% higher than the control, while the weight of fruits derived from boron-treated fowers was 17% higher than that of fruits...
Tipo: Journal article
Palavras-chave: Boric acid; Boron; Fruit weight; Kiwifruit; Seed number; Seed weight.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100013

Botánica Forense en Chile: El caso de Aristotelia chilensis (Molina) Stuntz y su potencial utilidad como especie bioindicadora forense
Provedor de dados: 73
Autores: ROMERO-MIERES,MARIO; VIVALLO,GABRIEL; DONOSO,GUSTAVO; ESSE,CARLOS; DÍAZ,RAMIRO; FRANCOIS,ANGÉLICA; SOLANO,JAIME; ORTLOFF,ALEXANDER; ALBORNOZ,SANDRA; BETANCOURT,ORIANA; COFRÉ,XIMENA; VALDIVIA,MARGARITA; DE LA FUENTE,JUAN CARLOS; FIGUEROA,ALEJANDRA; LIZAMA,CRISTIÁN.
Aristotelia chilensis is mentioned for the first time for plants grown on pig carcasses decomposing. Its potential as a bioindicator species for the development of forensic botany in Chile and its importance in the reconstruction of criminal events are discussed.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100018

Botanical Composition of Alpaca (Lama pacos Linn.) Diet in a Central Mediterranean Range of Chile
Provedor de dados: 117
Autores: Castellaro,G; Squella N,F; León C,F; Raggi S,A.
The re-introduction of domestic South American camelids (alpacas and llamas) in the central zone of Chile makes it necessary to study their behaviour and adaptability. Since it is fundamental to characterize the camelid’s diet, the present work had as an objective the determination of the plant species selected by the alpacas (Lama pacos Linn.) in different phenological stages (vegetative, reproductive and dry season). The study was carried out over three years in a paddock of 2.5 ha of sparse shrubland dominated by Acacia caven (Mol.) Mol. and annual species in the herbaceous stratum, which were continually grazed by five male alpacas. The botanical composition and the forage dry matter available for grazing in the pasture was evaluated. Botanical...
Tipo: Journal article
Palavras-chave: Alpaca; Annual Mediterranean range; Botanical composition; Microhistology.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000200003

Both Hepatic Lipogenesis and Beta-Oxidation are Altered in Offspring of Mothers Fed a High-Fat Diet in the First Two Generations (F1 and F2)
Provedor de dados: 77
Autores: Lannes,Wilian Rodrigues; Miranda,Andressa Cabral de; Souza-Mello,Vanessa de; Barbosa-da-Silva,Sandra; Aguila,Marcia Barbosa; Mandarim-de-Lacerda,Carlos Alberto.
The high fat (HF) fed mothers may program susceptibility in offspring to chronic diseases and affect subsequent generations. The present study evaluated the liver structure in adulthood, focusing on the F1 and F2 generations. Females C57BL/6 (F0) were fed standard chow (SC) or HF diet (8 weeks) prior to mating and during the gestation and lactation to provide the F1 generation (SC-F1 and HF-F1). All other mothers and offspring fed SC. At 3 months old, F1 females were mated to produce the F2 generation (SC-F2 and HF-F2). The liver was kept in several fragments and prepared for histological analysis or frozen for biochemical and molecular analyzes. The F1 and F2 offspring were studied at 3 months old. HF-F1 had higher body mass (BM) compared to SC-F1 (P=...
Tipo: Journal article
Palavras-chave: High-fat diet; Hepatic lipogenesis; Beta-oxidation; Maternal obesity; Offspring.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400052

Botrychium dusenii (H.Christ) Alston (Ophioglossaceae) nueva adición para la flora vascular del Parque Nacional Pali Aike, Región de Magallanes, Chile
Provedor de dados: 73
Autores: DOMÍNGUEZ,ERWIN; SUAREZ,ÁNGEL; BAHAMONDE,NELSON; OPAZO,SERGIO.
We report the presence of Botrychium dusenii (H. Christ) Alston (Ophioglossaceae), collected for the first time in the Pali Aike National Park, increasing to two cited pteridophytes for this protected area. This finding extends the distribution range of this species towards the Patagonian Steppe.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200028

Botryosphaeriaceae species affecting table grape vineyards in Chile and cultivar susceptibility
Provedor de dados: 118
Autores: Morales,Andrea; Latorre,Bernardo A; Piontelli,Eduardo; Besoain,Ximena.
Several Botryosphaeriaceae species have been identified as the causes of cankers and dieback of Vitis vinifera in several grape-growing regions around the world. This research was conducted to further study the species of Botryosphaeriaceae associated with table grapes in Chile, to estimate the prevalence and severity of the disease as a function of vineyard age, to study the susceptibility of table grape cultivars to infection by Botryosphaeriaceae species, and to evaluate the effect of tissue age on the infection caused by Botryosphaeriaceae species. Symptoms were characterized by the presence of the partial or total death of the grapevine cordons and distorted leaves. Brown V-shaped or U-shaped cankers and black spots were observed in cross-sections,...
Tipo: Journal article
Palavras-chave: Diplodia; Grapevine diseases; Spencermartinsia viticola; Trunk diseases; Vitis vinifera.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300005

Boty-II, a novel LTR retrotransposon in Botrytis cinerea B05.10 revealed by genomic sequence
Provedor de dados: 69
Autores: Zhao,Ming; Zhou,Jin yan; Li,Zhi dong; Song,Wei wei; Tan,You jiu; Tan,Hong.
Botrytis cinerea is a necrotrophic pathogen causing pre- and post-harvest diseases in at least 235 plant species. It manifests extraordinary genotype and phenotype variation. One of the causes of this variation is transposable elements. Two transposable elements have been discovered in this fungus, the retrotransposon (Boty), and the transposon (Flipper). In this work, two complete (Boty-II-76 and Boty-II-103) and two partial (Boty-II-95 and Boty-II-141) long terminal repeat (LTR) retrotransposons were identified by an in silico genomic sequence analysis. Boty-II-76 and Boty-II-103 contain 6439 bp nucleotides with a pair of LTRs at both ends, and an internal deduced pol gene encoding a polyprotein with reverse transcriptase and DDE integrase domains. They...
Tipo: Journal article
Palavras-chave: Botrytis cinerea; LTR retrotransposons; Molecular marker; Plant pathogen; Population diversity; Transposable elements.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300002

Bovine Bone Matrix Action Associated With Morphogenetic Protein in Bone Defects in Rats Submitted to Alcoholism
Provedor de dados: 77
Autores: Buchaim,Rogério Leone; Andreo,Jesus Carlos; Rodrigues,Antonio de Castro; Buchaim,Daniela Vieira; Roque,Domingos Donizeti; Roque,José Sidney; Rosa Júnior,Geraldo Marco.
Extended excessive alcohol use causes changes in bone tissue, thus affecting osteogenesis. The objective of this study was to evaluate if demineralized bone matrix (Gen-ox®) associated with bone morphogenetic protein (Gen-pro®) changes bone neoformation in rats submitted to experimental alcoholism. Forty male rats (Rattus norvegicus) were separated into 2 groups of 20 animals each: Group E1, which received ethyl alcohol at 25% and had the surgical cavity filled in only with blood clot; and Group E2, which received ethyl alcohol at 25% and had the surgical cavity filled in with demineralized bovine cortical bone associated with bone morphogenetic protein. The animals were submitted to a three-week period of gradual adaptation to alcohol, and then continued...
Tipo: Journal article
Palavras-chave: Bone repair; Alcoholism; Xenograft; Bone morphogenetic proteins.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100048

Bovine Peritoneum Protection Role on Intestinal Adhesions to a Vascular Graft: A Morphological Analysis
Provedor de dados: 77
Autores: Uema,Rogério Takeyoshi; Fazan,Valéria Paula Sassoli; Cherri,Jesualdo; Piccinato,Carlos Eli.
The present study aimed to experimentally evaluate the protection role of glycerin preserved bovine peritoneum (BP) against intestinal adhesions to a vascular graft. Experiments were performed on 24 adult rabbits, randomly dived into two groups. All animals were submitted to a vascular graft over the infra-renal aorta and vena cava. Group 1(12 animals ) was submitted to a BP patch on the retroperitoneal opening, between the vascular prosthetic graft and the intestinal loops. Group II (12 animals ) had the retroperitoneal opening sutured. After 7, 14, 28 and 60 days, 3 animals of each group were randomly killed and the retro peritoneum, with or without the BPpatch, was removed for histological analysis. The histological analysis showed that the BP...
Tipo: Journal article
Palavras-chave: Bovine peritoneum; Morphology; Aortoenteric fistula; Vascular graft.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200004

BrainTV: a novel approach for online mapping of human brain functions
Provedor de dados: 48
Autores: LACHAUX,JEAN-PHILIPPE; JERBI,KARIM; BERTRAND,OLIVIER; MINOTTI,LORELLA; HOFFMANN,DOMINIQUE; SCHOENDORFF,BENJAMIN; KAHANE,PHILIPPE.
Our understanding of the brain's functional organisation has greatly benefited from occasional exploratory sessions during electrophysiological studies, trying various manipulations of an animal's environment to trigger responses in particular neurons. Famous examples of such exploration have unveiled various unexpected response properties, such as those of mirror neurons. This approach, which relies on the possibility to test online the reactivity of precise neural populations has no equivalent so far in humans. The present study proposes and applies a radically novel framework for mapping human brain functions in ecological situations based on a combination of a) exploratory sessions, using real-time electrophysiology to formulate hypotheses about the...
Tipo: Journal article
Palavras-chave: Speech; Gamma rhythm; Beta rhythm; Brain computer interface; Neurofeedback; Neural synchronization.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000500004

Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?
Provedor de dados: 97
Autores: LUSK,CHRISTOPHER H.; LE-QUESNE,CARLOS.
The growth of Araucaria araucana, like that of many other conifers, is characterised by the production of a monopodial stem with branch whorls. However, the periodicity of whorl formation in this species has not been subjected to systematic study. We used growth ring counts to determine the frequency of whorl formation in sun- and shade-grown juvenile A. araucana in a montane forest in the Chilean coast range. Whorls were not annual in any of the 35 individuals studied, growth rings outnumbering whorls by a factor of 1.8 to 3.9. The mean interval between successive whorls was significantly shorter in sun-grown (2.1 yrs whorl -1) than in shade-grown trees (2.6 yrs whorl-1), suggesting a relationship with plant carbon balance. Mean distance between whorls...
Tipo: Journal article
Palavras-chave: Araucariaceae; Conifers; Dendroecology; Tree growth; Tree rings.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300013

Brassica tournefortii Gouan (Brassicaceae), nuevo registro para la flora alóctona asilvestrada de Chile
Provedor de dados: 73
Autores: TEILLIER,SEBASTIÁN; PRINA,ANÍBAL; LUND,ROSEMARIE.
Brassica tournefortii is registered for first time for Chilean territory as an alien plant species. A brief description and illustrations are given. The specimens here cited were collected in Los Molles (32°14&amp;#8217;S-71°31&amp;#8217;W) at Valparaiso Region at the Pacific coast of Chile.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200014

BRCA1 and BRCA2mutations in breast cancer patients from Venezuela
Provedor de dados: 48
Autores: Lara,Karlena; Consigliere,Nigmet; Pérez,Jorge; Porco,Antonietta.
A sample of 58 familial breast cancer patients from Venezuela were screened for germline mutations in the coding sequences and exon-intron boundaries of BRCA1 (MIM no. 113705) and BRCA2 (MIM no. 600185) genes by using conformation-sensitive gel electrophoresis. Ashkenazi Jewish founder mutations were not found in any of the samples. We identified 6 (10.3%) and 4 (6.9%) patients carrying germline mutations in BRCA1 and BRCA2, respectively. Four pathogenic mutations were found in BRCA1, one is a novel mutation (c.951_952insA), while the other three had been previously reported (c.1129_1135insA, c.4603G&gt;T and IVS20+1G&gt;A). We also found 4 pathogenic mutations in BRCA2, two novel mutations (c.2732_2733insA and c.3870_3873delG) and two that have been...
Tipo: Journal article
Palavras-chave: BRCA genes; Breast cancer; Screening mutations.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000200003

BRD4 inhibition suppresses cell growth, migration and invasion of salivary adenoid cystic carcinoma
Provedor de dados: 48
Autores: Wang,Limei; Wu,Xiuyin; Wang,Ruolin; Yang,Chengzhe; Li,Zhi; Wang,Cunwei; Zhang,Fenghe; Yang,Pishan.
Abstract  Background: Bromodomain-containing protein 4 (BRD4) inhibition is a new therapeutic strategy for many malignancies. In this study, we aimed to explore the effect of BRD4 inhibition by JQ1 on in vitro cell growth, migration and invasion of salivary adenoid cystic carcinoma (SACC).  Methods: The human normal epithelial cells and SACC cells (ACC-LM and ACC-83) were treated with JQ1 at concentrations of 0, 0.1, 0.5 or 1 &amp;#956;M. Cell Counting Kit-8 (CCK-8) assay was performed to evaluate cell proliferation. Cell apoptosis and cell cycle distribution was evaluated by Flow cytometry. Immunofluorescence staining was used to examine the expression of BRD4 in SACC cells. The quantitative real-time polymerase chain reaction (qRT-PCR) assay and western...
Tipo: Journal article
Palavras-chave: Salivary adenoid cystic carcinoma; BRD4 inhibition; Proliferation; Migration; Epithelial-mesenchymal transition.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100213

Breeding distribution and abundance of seabirds on islands off north-central Chile
Provedor de dados: 97
Autores: SIMEONE,ALEJANDRO; LARA-JORQUERA,GUILLERMO; BERNAL,MARIANO; GARTHE,STEFAN; SEPÚLVEDA,FELIPE; VILLABLANCA,ROBERTO; ELLENBERG,URSULA; CONTRERAS,MACARENA; MUÑOZ,JULIETA; PINCE,TAMARA.
Between 1999 and 2003 we collected information on the breeding distribution and abundance of 12 seabird species occurring on nine islands off the coasts of north and central Chile (27°-33°S). The Peruvian booby Sula variegata was the most abundant seabird with a breeding population of ca. 18,000 pairs concentrated in two islands, followed by the Humboldt penguin Spheniscus humboldti with ca. 9,000 pairs, the largest colony being at Chañaral Island with ca. 7,000 pairs. Kelp gulls Larus dominicanus bred at all the surveyed sites in colonies of variable size, ranging from 40 to 2,000 pairs. Peruvian diving-petrels Pelecanoides garnotii and Peruvian pelicans Pelecanus occidentalis bred at restricted sites, but generally in large colonies. Magellanic penguins...
Tipo: Journal article
Palavras-chave: Aves marinas; Colonia reproductiva; Abundancia; Conservación; Corriente de Humboldt; Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200016

Breeding in peach, cherry and plum: from a tissue culture, genetic, transcriptomic and genomic perspective
Provedor de dados: 48
Autores: Carrasco,Basilio; Meisel,Lee; Gebauer,Marlene; Garcia-Gonzales,Rolando; Silva,Herman.
This review is an overview of traditional and modern breeding methodologies being used to develop new Prunus cultivars (stone fruits) with major emphasis on peach, sweet cherry and Japanese plum. To this end, common breeding tools used to produce seedlings, including in vitro culture tools, are discussed. Additionally, the mechanisms of inheritance of many important agronomical traits are described. Recent advances in stone fruit transcriptomics and genomic resources are providing an understanding of the molecular basis of phenotypic variability as well as the identification of allelic variants and molecular markers. These have potential applications for understanding the genetic diversity of the Prunus species, molecular marker-assisted selection and...
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000300001

Breeding of high lipid producing strain of Geotrichum robustum by ion beam implantation
Provedor de dados: 69
Autores: Cao,Yuanyuan; Yao,Jianming; Li,Jun; Chen,Xiangsong; Wu,Jinyong.
To obtain an industrial strain with high lipid yield, the wild strain G0 of Geotrichum robustum was mutated by means of nitrogen ions implantation. Mutagenic effects of strain G0 by low energy N+ ion implantation were studied. The experimental results indicated that the survival rate curve took a ?saddle? shape, and the positive mutation rate was increased to 22.00% at the dose of nitrogen ions 2.0 x 10(15) ions/cm² when the survival rate was 28.60%. By repeated screening, a high lipid producing strain G9 was obtained. The biomass, lipid content and lipid yield of the mutant can reach 40.25 g/L, 71.14% and 28.63 g/L after cultured in a 5L fermenter for 8 days, increasing by 52.81%, 68.82% and 157.93% to those of wild strain, respectively. Analysis results...
Tipo: Journal article
Palavras-chave: Fatty acids; Geotrichum robustum; High lipid producing strain; Ion beam implantation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600002

Breeding of Markham's Storm-Petrel (Oceanodroma markhami, Aves: Hydrobatidae) in the desert of northern Chile
Provedor de dados: 97
Autores: TORRES-MURA,JUAN C; LEMUS,MARINA L.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400013

Breeding system of Embothrium coccineum (Proteaceae) in two populations on different slopes of the Andes
Provedor de dados: 97
Autores: ROVERE,ADRIANA E; SMITH-RAMÍREZ,CECILIA; ARMESTO,JUAN J; PREMOLI,ANDREA C.
Plant breeding systems are considered to reflect species' life history characteristics, selection due to biotic or abiotic factors, pollination conditions, or a combination of these. Reproductive systems may vary over ecological gradients. The breeding system of the ornithophilous Embothrium coccineum (Proteaceae) from temperate South America was studied by pollination treatments: manual self-pollination, manual cross-pollination, automatic self-pollination, and natural pollination. These treatments were conducted in a coastal western and an Andean eastern population. Embothrium coccineum was found to be self-incompatible and highly dependent on the pollinating agent at both sites. However, pollen limitations were greater in the coastal population, as...
Tipo: Journal article
Palavras-chave: Self-incompatibility; Endemic species; Temperate forest.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200008

Brennand: resonancia y universalidad de las formas
Provedor de dados: 97
Autores: TORO,G. CECILIA.
Este trabajo propone la búsqueda y exposición de patrones de formas, tanto de algunas obras producidas por la naturaleza como de algunas de las obras producidas por la mano del hombre, quien como un microcosmos, que forma parte de la naturaleza recrea el macrocosmos. En una cultura en que el hombre ha perdido contacto con la naturaleza, con sus semejantes y con sus orígenes, otro objetivo de este trabajo es re emparentar al hombre con la naturaleza de la que forma parte. Se pretende mostrar al hombre, como un fractal del Universo, que es capaz de recrear, independientemente del tiempo, del espacio y de la escala de magnitudes, las mismas formas que crea el Universo, con la fuerza de la belleza en toda su pureza y en todo lo terrible con que a veces se nos...
Tipo: Journal article
Palavras-chave: Brennand; Resonancia mórfica; Evolución; Arte; Sincronía; Arquetipo.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000022

BRIOFITAS SOBRE CARPOFOROS DE HONGOS
Provedor de dados: 73
Autores: Ardiles Huerta,Victor; Osorio-Zúñiga,Felipe; Barrera Moscoso,Elizabeth.
Se registra el desarrollo de briófitas sobre carpóforos de hongos de estructura coriácea, leñosa y perenne. Los resultados revelan la presencia de siete especies de hepáticas fo liosas: Bazzania peruviana, Heteroscyphus integrifolius, Leiomitria elegans, Lepidozia chordulifem, Plagiochila bispinosa, Porella chilensis, Telaranea blepharostoma y dos musgos: Dicranoloma robustum e Hypnum chrysogaster. Se propone que los hongos de estas características son un apropiado sustrato para el desarrollo de algunas especies de hepáticas foliosas y musgos. Este artículo es una primera aproximación al estudio de briófitas que crecen sobre la superficie de carpóforos de hongos.
Tipo: Journal article
Palavras-chave: Hepáticas; Musgos; Estructura coriácea.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100008

Bronchial tree Architecture in Mammals of Diverse Body Mass
Provedor de dados: 77
Autores: Monteiro,Adilson; Smith,Ricardo Luiz.
The anatomy of mammal's lung air space constitutes the bronchial tree which disposition is associated to air flux dynamics. Casts obtained from human, pig and rat lungs were studied to analyze possible differences of the bronchial tree architecture in mammals with diverse dimensions and posture. Air spaces were filled with polymers through trachea followed by acid corrosion. Tracheal and main bronchial division's diameters were measured to relate with body mass using allometry. The results revealed a dichotomic bronchial branching pattern in the human casts and a monopodial pattern in animals. In allometric relationship trachea was larger in rats, then pigs and lastly in humans, differences were statistically significant, the same occurs in right bronchus,...
Tipo: Journal article
Palavras-chave: Bronchia; Anatomy; Human; Pig; Rat.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100050

Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costs
Provedor de dados: 97
Autores: FERNÁNDEZ,MIRIAM; BRANTE,ANTONIO.
The quantification of the costs associated with parental care of marine invertebrates requires a first and necessary step, which is the identification of the different forms of care exhibited by this group. Among marine invertebrates, provision of oxygen to the aggregation of embryos may be critical, although most evidence on the link between oxygen limitation and parental care is indirect. Species which show active behavior directed at providing oxygen to the brood offer a good model to establish the direct link between behavioural patterns and oxygen provision to the embryos, and to estimate the costs associated with this form of care. In this manuscript, we conducted a review of the current knowledge about oxygen limitation in embryos aggregations of...
Tipo: Journal article
Palavras-chave: Reproduction; Brood care; Crabs; Oxygen; Marine invertebrates.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200003

BRYOZOA DE AGUAS SOMERAS EN BAHIA SOUTH, ISLA DOUMER, PENÍNSULA ANTARTICA
Provedor de dados: 72
Autores: Moyano G,Hugo I.; Cancino,Juan M.
Como parte de las actividades del proyecto INACH 05-97 realizadas en Bahía South, Antártica, en enero de 1999 se extrajeron por buceo autónomo 43 especies de briozoos, de los órdenes Cheilostomatida (34), Ctenostomatida (2) y Cyclostomatida (7). De éstas 21 fueron nuevas para la Bahía South y el endemismo del conjunto alcanzó al 72%. Las especies dominantes fueron Himantozoum antarcticum y Nematoflustra flagellata y sobre ellas se desarrolló la mayoría de las otras como epibiontes. Dos especies de los géneros Smittina y Crisidia resultaron ser nuevas para la ciencia y serán descritas separadamente. El análisis de la distribución de especies epibiontes e incrustantes sobre substratos diversos mostró la mayor afinidad entre algas rodófitas, Himantozoum...
Tipo: Journal article
Palavras-chave: Antártica; Briozoos; Epibiosis; Polimorfismo; Submareal rocoso.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200006

Bt protein rhizosecreted from transgenic maize does not accumulate in soil
Provedor de dados: 69
Autores: Margarit,Ezequiel; Reggiardo,Martín I; Permingeat,Hugo R.
The persistence of CryIAb protein rhizosecreted in soil is important in the assessment of its environmental risk. Here we report that CryIAb protein from transgenic maize does not accumulate at high levels in soils. Levels of CryIAb protein rhizosecreted by three maize transgenic events (BT11, MON810 and 176) were studied in hydroponic cultures and found only in the MON810 and BT11 events but not in event 176 or control plants. Under field conditions, the cryIAb gene and a basal level of CryIAb protein was detected in soils from plots cultivated with transgenic and non-transgenic maize, possibly from Bacillus thuringiensis present in the soils.
Tipo: Journal article
Palavras-chave: CryIAb gene; CryIAb protein; ELISA; Genetically modified organisms; PCR; Zea mays (L.).
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200004

Buffering action of acetate on hydrogen production by Ethanoligenens harbinense B49
Provedor de dados: 69
Autores: Xu,Ji-Fei; Mi,Yuan-Ting; Ren,Nan-Qi.
The buffering effect of acetate on hydrogen production during glucose fermentation by Ethanoligenens harbinense B49 was investigated compared to phosphate, a widely used fermentative hydrogen production buffer. Specific concentrations of sodium acetate or phosphate were added to batch cultures, and the effects on hydrogen production were comparatively analyzed using a modified Gompertz model. Adding 50 mM acetate or phosphate suppressed the hydrogen production peak and slightly extended the lag phase. However, the overall hydrogen yields were 113.5 and 108.5 mmol/L, respectively, and the final pH was effectively controlled. Acetate buffered against hydrogen production more effectively than did phosphate, promoting cell growth and preventing decreased pH....
Tipo: Journal article
Palavras-chave: Acetate; Biohydrogen; Buffering action; Ethanoligenens harbinense phosphate.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500002

Building Biotechnology: Starting, Managing, and Understanding Biotechnology Companies
Provedor de dados: 69
Autores: Marshall,Sergio.
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100002

Ca2+ entry, efflux and release in smooth muscle
Provedor de dados: 48
Autores: MATTHEW,A; SHMYGOL,A; WRAY,SUSAN.
Control of smooth muscle is vital for health. The major route to contraction is a rise in intracellular [Ca2+], determined by the entry and efflux of Ca2+ and release and re-uptake into the sarcoplasmic reticulum (SR). We review these processes in myometrium, to better understand excitation-contraction coupling and develop strategies for preventing problematic labours. The main mechanism of elevating [Ca2+] is voltage-gated L-type channels, due to pacemaker activity, which can be modulated by agonists. The rise of [Ca2+] produces Ca-calmodulin and activates MLCK. This phosphorylates myosin and force results. Without Ca2+ entry uterine contraction fails. The Na/Ca exchanger (NCX) and plasma membrane Ca-ATPase (PMCA) remove Ca2+, with contributions of 30%...
Tipo: Journal article
Palavras-chave: Uterus; SR; Signalling; Ca-ATPase.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400017

Ca-activated K channels: the ins and outs of calmodulin
Provedor de dados: 48
Autores: ORREGO,FERNANDO.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000100006

Cadmium and Lead content in Liver and Kidney tissues of Wild Turkey Vulture Cathartes aura (Linneo, 1758) from Chañaral, Atacama desert, Chile
Provedor de dados: 72
Autores: Valladares F,Pablo; Alvarado,Sergio; Urra R,Carolina; Abarca,Jorge; Inostroza,Jorge; Codoceo,Juana; Ruz,Manuel.
The Atacama region, Chile, presents one of the highest levels of mining exploitation of the country, which leads to high levels of contamination from mine tailings and other related environmental liabilities. One of the most complex situations occurred in the Chañaral city, north of Chile, where for over 50 years mine tailings were dumped on the coast, causing severe damage in the ecosystem. To evaluate the effects on terrestrial biota, we analyzed the concentration of cadmium and lead in tissues of Turkey Vulture (Cathartes aura). The results indicate that accumulation of cadmium in kidney was 10.31 &amp;#956;g/g (SD 8.00, range 0.27 to 20.73 &amp;#956;g/g) while in the liver was 5.24 &amp;#956;g/g (SD 8.00, range 0.49 to 19.70). There values are very...
Tipo: Journal article
Palavras-chave: Ecotoxicology; Heavy Metals; Cathartes aura.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200004

Cadmium toxicity affects chlorophyll a and b content, antioxidant enzyme activities and mineral nutrient accumulation in strawberry
Provedor de dados: 48
Autores: Muradoglu,Ferhad; Gundogdu,Muttalip; Ercisli,Sezai; Encu,Tarik; Balta,Fikri; Jaafar,Hawa ZE; Zia-Ul-Haq,Muhammad.
BACKGROUND: Cadmium (Cd) is well known as one of the most toxic metals affecting the environment and can severely restrict plant growth and development. In this study, Cd toxicities were studied in strawberry cv. Camarosa using pot experiment. Chlorophyll and malondialdehyde (MDA) contents, catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX) activities and mineral nutrient concentrations were investigated in both roots and leaves of strawberry plant after exposure Cd. RESULTS: Cd content in both roots and leaves was increased with the application of increasing concentrations of Cd. We found higher Cd concentration in roots rather than in leaves. Chlorophyll a and b was decreased in leaves but MDA significantly increased under increased...
Tipo: Journal article
Palavras-chave: Antioxidant enzymes; Cadmium; Chlorophyll; Heavy metal stress; Strawberry.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100011

Cadmium-induced apoptosis of Siberian tiger fibroblasts via disrupted intracellular homeostasis
Provedor de dados: 48
Autores: Wang,Hui; Liu,Zheng; Zhang,Wenxiu; Yuan,Ziao; Yuan,Hongyi; Liu,Xueting; Yang,Chunwen; Guan,Weijun.
BACKGROUND: Heavy metals can cause great harm to Siberian tigers in the natural environment. Cadmium (Cd2+) is an environmental contaminant that affects multiple cellular processes, including cell proliferation, differentiation, and survival. It has been shown to induce apoptosis in a variety of cell types and tissues. RESULTS: We investigated the apoptotic effects of Cd2+ on Siberian tiger fibroblasts in vitro. Our research revealed the typical signs of apoptosis after Cd²+ exposure. Apoptosis was dose- (0-4.8 &amp;#956;&amp;#924;) and duration-dependent (12-48 h), and proliferation was strongly inhibited. Cd²+ increased the activity of caspase-3, -8, and -9 and disrupted calcium homeostasis by causing oxidative stress and mitochondrial dysfunction. It...
Tipo: Journal article
Palavras-chave: Siberian tiger; Cadmium; Apoptosis; Fibroblast; Calcium.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100042

Calcaneal Pitch and Lateral Talocalcaneal Angle among Nigerians
Provedor de dados: 77
Autores: Dahiru,Ahmadu Usman; Ojo,Samuel Adeniyi; Hamidu,Ahmed Umdagas; Danborno,Barnabas.
Various papers in the fields of Radiology, orthopaedics and radiographic anatomy have employed the use of angles measured on X-rays to make diagnoses, select treatment modalities in the management of foot disorders as well as predicting the outcome of interventions to these disorders. Calcaneal pitch (CP) and lateral talocalcaneal angle (L TCA) are angles that can be drawn on lateral standing radiographs of the foot and are used widely in the diagnosis, prognosis and choice of treatment modalities for various disorders of the foot. Data on these important radiological tools are lacking in Nigeria. Hence, the study is an attempt to bridge this gap. Using a hinge goniometer, the angles were measured from normal lateral standing radiographs of the foot. Mean...
Tipo: Journal article
Palavras-chave: Calcaneal pitch; Lateral talocalcaneal angle; Nigerians.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200028

Calceolaria ascendens subsp. exigua, comb. et stat. nov. (Calceolariaceae), endémica de la cordillera de la Costa de Chile central
Provedor de dados: 73
Autores: García,Nicolás.
The new combination Calceolaria ascendens Lindl. subsp. exigua (Witasek) Nic.García is made based on material collected at Central Chile’s Coastal mountain range, around parallel 33º S. The new subspecies inhabits rock crevices at the high mountain between 1,600 and 2,100 m a.s.l.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100014

CALCEOLARIA CALEUANA M.MUÑOZ ET MOREIRA NOM. NOV., NUEVO NOMBRE PARA LA ESPECIE ENDÉMICA CHILENA CALCEOLARIA ESPINOSAE M.MUÑOZ ET MOREIRA (CALCEOLARIACEAE)
Provedor de dados: 73
Autores: Muñoz-Schick,Mélica; Moreira-Muñoz,Andrés.
A new name for Calceolaria espinosae M.Muñoz et Moreira, non Pennell, is proposed.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200012

Calceolaria lagunae-blancae Kraenzl., nuevo registro para la flora de Chile
Provedor de dados: 73
Autores: URRUTIA,JONATHAN; BRAVO-MONASTERIO,PABLO.
For first time in Chile is documented the presence of Calceolaria lagunae-blancae Kraenzl., a species registered only in Argentina up to now. The collection was carried out in the Aisen Region, specifically in Coyhaique Alto town. We provide a description of the species and their habitat.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100016

Calcific Metamorphosis with Pathological Root Resorption in Permanent Teeth: Morphohistometric Evaluation of Two Cases
Provedor de dados: 77
Autores: Fonseca,Gabriel M; Fonseca,Miguel M.
Calcific Metamorphosis (CM) is a pulpal response to dental trauma characterized by a deposition of hard tissue within the canal space. A tooth with CM usually presents a discoloration and a partial or total obliteration of the pulp canal space, and its vital pulp tests and symptoms are difficult. Since pulp necrosis cannot be supposed even the negative responses, the periradicular status is the only reliable criterion. Two permanent teeth diagnosed as CM and pathological root resorption, extracted from two males (22 and 53 years of age) due to severe mobility were prepared and sectioned for histological and histometrical evaluation. Images were captured, processed and measured in a total mapping of each specimen with software Pinnacle Studio 9.4® (Pinnacle...
Tipo: Journal article
Palavras-chave: Dental pulp; Calcific metamorphosis; Pathological root resorption; Diagnoses; Endodontics.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200047

Calcium Levels in the Maxillae of Human Foetuses
Provedor de dados: 77
Autores: Farah,Ghaus; Faruqi,N. A; Khan,H. S; Kirmani,F.
Calcium along with phosphorus and carbonate imparts hardness and strength to skeletal system. Most of the human studies in this context are based on informations in postnatal life. There are different theories to explain the manner in which the matrix of bone becomes impregnated with the two inorganic salts, calcium phosphate and calcium carbonate. In our study, 29 human foetuses were obtained from the museum section of Department of Anatomy, J .N. Medical College, Aligarh, and divided into five groups. Maxillae were cleaned by separating the soft tissue and dissolved in concentrated nitric acid to determine calcium. Results were analysed by using Student's 't' test. The most striking feature of our findings was a reduction in aforementioned relative...
Tipo: Journal article
Palavras-chave: Calcium; Foetus; Maxilla; Development; Facial Skeleton.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100044

CALCIUM RELEASE AND CELLULAR CALCIUM SIGNALLING DOMAINS
Provedor de dados: 48
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000100012

Calcium signal compartmentalization
Provedor de dados: 48
Autores: PETERSEN,OLE H.
Cytosolic calcium signals are produced by suddenly increasing the concentration of free calcium ions (Ca2+). This can occur by opening channels permeable to Ca2+ either in the surface cell membrane or in the membranes of intracellular organelles containing high Ca2+ concentrations. Ca2+ signals can control several different processes, even in the same cell. In pancreatic acinar cells, for example, Ca2+ signals do not only control the normal secretion of digestive enzymes, but can also activate autodigestion and programmed cell death. Recent technical advances have shown that different patterns of Ca2+ signals can be created, in space and time, which allow specific cellular responses to be elicited. The mechanisms responsible for Ca2+ signal...
Tipo: Journal article
Palavras-chave: Calcium signals Ca2+ release channels Ca2+ pumps endoplasmic reticulum mitochondria pancreatic acinar cell pancreatitis; Secretion apoptosis.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000200008

Calcium signaling: A historical account
Provedor de dados: 48
Autores: CARAFOLI,ERNESTO.
Tipo: Journal article
Palavras-chave: Calcium signaling; Calcium sensors; Calcium transporters.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400002

CALCIUM SIGNALING: A UNIVERSAL MECHANISM OF CELLULAR COMMUNICATION
Provedor de dados: 48
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400001

CALIBRACION DEL BIOENSAYO DE TOXICIDAD AGUDA CON DAPNIA PULEX (CRUSTACEA: CLADOCERA) USANDO UN TOXICO DE REFERENCIA
Provedor de dados: 72
Autores: Silva,Jeannette; Torrejón,Guillermo; Bay-Schmith,Enrique; Larrain,Alberto.
Los bioensayos de toxicidad, como cualquier instrumento analítico, requieren ser calibrados contra un patrón, el tóxico de referencia. Aunque el instrumento, en este caso los organismos de prueba, no puede ser ajustado a una respuesta esperada, la calibración permite aceptar o rechazar los organismos de prueba cuando provienen de una población cuya respuesta ante el tóxico de referencia está dentro o fuera del rango determinado para ese compuesto químico. El estudio de calibración que aquí se expone determina la precisión y exactitud intralaboratorio (Laboratorio de Bioensayos, Universidad de Concepción) alcanzadas en la ejecución del bioensayo de toxicidad aguda con Daphnia pulex De Geer 1877 (Crustacea: Cladocera) mediante la determinación de la...
Tipo: Journal article
Palavras-chave: Toxicidad aguda; Daphnia pulex; Bicromato de potasio; Bioensayos; Calibración; Tóxico de referencia.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100011

CALIDAD DE LA VEGETACIÓN RIBEREÑA DEL RÍO MAULLÍN (41° 28' S; 72° 59' O) UTILIZANDO EL ÍNDICE QBR
Provedor de dados: 73
Autores: Fernández,Leonardo; Rau,Jaime; Arriagada,Aldo.
El río Maullín es uno de los sitios prioritarios identificados por la CONAMA como de interés para la conservación in situ presentando en su curso vegetación de asociaciones endémicas que alberga y protege una amplia diversidad de organismos, algunos de los cuales, presentan problemas de conservación. A pesar de esto, esta vegetación está siendo talada y reemplazada por especies exóticas. Con la finalidad de generar un diagnóstico de la calidad de la vegetación ribereña de este río, se aplicó en 24 estaciones el índice español QBR, el cual se basa en el registro in situ de diferentes atributos y componentes del área ribereña. Los resultados indican que el 16,7 % de las estaciones están con degradación extrema y calidad pésima (QBR &lt; 25), el 20,8 % con...
Tipo: Journal article
Palavras-chave: Río Maullín; Índice QBR; Calidad vegetación ribereña.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200011

Calidad de Vida Relacionada con Salud: Una Variable Resultado a Considerar en Investigación Clínica
Provedor de dados: 77
Autores: Manterola D,Carlos; Urrutia,Sebastián; Otzen H,Tamara.
Es aceptada la conveniencia de medir calidad de vida relacionada a salud (CVRS) como variable de interés en investigación clínica, para lo cual, existe una gran variedad de instrumentos de medición disponibles. El objetivo de este artículo es describir los conceptos básicos referentes a CVRS y algunos ejemplos de instrumentos utilizados para valorar este constructo. Material y método: Se realizó una búsqueda en los motores Google y Yahoo; en los metabuscadores Ixquick y Copérnico; y en la base de datos "Documents in Information Science" (DoIS). En la estrategia de búsqueda, se utilizaron los términos "calidad de vida", "calidad de vida relacionada con salud" y "CVRS". Una vez localizados los resúmenes de los artículos localizados, se evaluaron los...
Tipo: Journal article
Palavras-chave: Calidad de vida; Calidad de vida relacionada con salud; Cirugía digestiva alta; Cirugía gastrointestinal; Base de datos; Toma de decisiones en salud; Medicina basada en evidencias.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400059

Calidad del Agua Subterránea con Fines de Riego Suplementario en Argiudoles del Centro de Santa Fe, Argentina
Provedor de dados: 113
Autores: Ruda,Ester; Mongiello,Adriana; Acosta,Adriana; Ocampo,Ester; Contini,Liliana.
Considerando que el agua subterránea usada para riego suplementario tiene características químicas variables que pueden afectar las propiedades del suelo, se trataron un Argiudol típico (A1) y un Argiudol ácuico (Ap), con aguas de riego artificiales de diferentes relaciones de adsorción de sodio (RAS): 6,3; 11,0; 16,5; 21,5 y 24,3. Se analizó: carbono (Walckey Black); pH (1:2,5) (a pHmetro); capacidad de intercambio catiónico (CIC), Ca2+, Mg2+ y H+ (volumetría) y Na+ y K+ (espectroscopía de emisión átómica). Los objetivos del trabajo fueron: encontrar modelos de predicción de porcentaje de sodio intercambiable (PSI) vs. RAS, pH vs. RAS y pH vs. Na adsorbido; analizar si existe un valor límite de Na adsorbido; determinar la evolución de la materia orgánica...
Tipo: Journal article
Palavras-chave: Suelo; Adsorción de sodio; Modelos estadísticos.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000400007

Calidad del bosque de ribera del río El Tunal, Durango, México; mediante la aplicación del índice QBR
Provedor de dados: 73
Autores: Rodríguez-Téllez,Efraín; Domínguez-Calleros,Pedro A; Pompa-García,Marín; Quiroz-Arratia,José A; Pérez López,María Elena.
La evaluación de la condición ecológica de las riberas es un elemento importante en el estudio de los ríos alrededor del mundo. El objetivo del presente trabajo fue evaluar la calidad del bosque de ribera, desde un punto de vista estructural y funcional, en un tramo de 21 kilómetros del río El Tunal en Durango, México, mediante la aplicación del índice QBR. En el tramo estudiado se evaluaron seis sitios seleccionados por su representatividad, accesibilidad y heterogeneidad de su vegetación. En general, los resultados muestran un río con indicios importantes de deterioro; se encontraron dos sitios con calidad intermedia, dos sitios presentaron calidad mala y los dos restantes presentaron calidad pésima.
Tipo: Journal article
Palavras-chave: QBR; El Tunal; México; Bosque de ribera.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100014

Callus culture development of two varieties of Tagetes erecta and carotenoid production
Provedor de dados: 69
Autores: Benítez-García,Israel; Vanegas-Espinoza,Pablo Emilio; Meléndez-Martínez,Antonio J; Heredia,Francisco J; Paredes-López,Octavio; Del Villar-Martínez,Alma Angélica.
Background The properties of natural pigments, such as antioxidants, functional, medical, and nutraceutical, have demonstrated the advantages of these natural compounds over synthetic ones. Some products are accepted only when they are pigmented with natural, food-quality colorants: for example poultry products (manly marigold flower extracts). Carotenoids such as &amp;#946;-carotene, &amp;#946;-criptoxanthin and lutein are very attractive as natural food colorants due to their antioxidant and pro-vitamin activities which provide additional value to the target products. Marigold (Tagetes erecta) is an Asteraceous ornamental plant native to Mexico, and it is also important as a carotenoid source for industrial and medicinal purposes but nowadays its...
Tipo: Journal article
Palavras-chave: 2 4-D; BA Cell development Lutein Marigold.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000300001

Callus culture for biomass production of milk thistle as a potential source of milk clotting peptidases
Provedor de dados: 69
Autores: Cimino,Cecilia; Vairo Cavalli,Sandra; Spina,Francisco; Natalucci,Claudia; Priolo,Nora.
The objective of this work was the optimization of the conditions of in vitro culture for callus production of Silybum marianum (L.) Gaertn. (Asteraceae). Sections of cotyledons, previously disinfected by washing successively with ethanol 70&amp;ordm;, NaClO (10% w/v) and Tween 20 (0.05% v/v) and rinsing with sterile distilled water, were used as explants. For its initial culture, B5 medium supplemented with BA and 2,4-D solidified with phytagel was used, and a 63% survival was achieved. To obtain callus, two solid media were assayed (S1 and S2) using B5 medium supplemented with growth regulators (BA and 2,4-D or NAA and BA, respectively). The calli were grown at 25&amp;ordm;C during 45 days in darkness. Growth kinetics was studied using S1 medium...
Tipo: Journal article
Palavras-chave: Asteraceae; Callus; Rhizogenesis; Silybum marianum.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300012

Callus induction and plant regeneration of the endemic Astragalus nezaketae in Turkey
Provedor de dados: 69
Autores: Erisen,Semiha; Yorgancilar,Mustafa; Atalay,Emine; Babaoglu,Mehmet; Duran,Ahmet.
A callus induction and plant regeneration protocol was developed from leaf and petiole explants of the endemic Astragalus nezaketae. Explants were cultured on Murashige and Skoog medium (MS) supplemented with different plant growth regulators (PGRs) [?-naphthaleneacetic acid (NAA), benzyladenine (BA), 2,4-dichlorophenoxyacetic acid (2,4-D), kinetin (Kin), thidiazuron (TDZ)]. The combinations and concentrations of PGRs were shown significant variations for the frequency of callus formation, appearence of callus and the potential of callus differentiation. NAA x BA have been found highly affective in callusing and plant regeneration. Other PGRs have not resulted in callus differentiation for shoot formation. The highest number of shoots (6/explants) was...
Tipo: Journal article
Palavras-chave: Astragalus; Callus; Organogenesis; Plant regeneration.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600013

Callus induction and plant regeneration of Ulex europaeus
Provedor de dados: 69
Autores: Ramírez,Ingrid; Dorta,Fernando; Cuadros-Inostroza,Álvaro; Peña-Cortés,Hugo.
A callus induction and plant regeneration protocol was developed from leaf and thorn explants for the plant Ulex europaeus. Explants were incubated on 2% sucrose half-strength Murashige and Skoog Medium (MS) with various combinations of plant growth regulators and antioxidants. The best frequency of callus and shoot formation was obtained with 2,4-dichlorophenoxyacetic acid (2,4-D) 1 mg/l x kinetin (Kin) 0.2 mg/l (DK Medium; callus induction) and zeatin (Z) 1 mg/l (DK medium; shoot induction). Both media were supplemented with ascorbic acid 200 mg/l to prevent browning and death of the explants. The regenerated shoots transferred to rooting medium (half-strength MS Medium, 2% sucrose) showed rapid growth and development of roots (100%). Rooted plantlets...
Tipo: Journal article
Palavras-chave: Antioxidants; Callus induction; Fabaceae; Gorse; Plant regeneration; Ulex europaeus.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400007

Callyntra hibrida n. sp.: Un nuevo tenebriónido de Chile central (Coleoptera: Tenebrionidae)
Provedor de dados: 72
Autores: Zúñiga-Reinoso,Álvaro; Cid-Arcos,Mauricio.
Callyntra Solier,1836, es un género endémico de Chile, que contiene 17 especies descritas hasta la fecha. En este artículo se describe a Callyntra hibrida, una nueva especie de tenebriónido de la cordillera de la Costa de Chile Central.
Tipo: Journal article
Palavras-chave: Pimeliinae; Nyctelini; Nueva especie; Taxonomía.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200007

Callyntra inconsiderata sp. nov. (Coleoptera: Tenebrionidae), una nueva especie para la costa de Chile Central
Provedor de dados: 72
Autores: ZÚÑIGA-REINOSO,ÁLVARO.
RESUMEN Callyntra Solier, 1836, es un género endémico de Chile y Argentina que contiene 21 especies descritas hasta la fecha. Mediante recolecciones y revisión de material proveniente de la costa de las Regiones V y VI, se encontró con especímenes asignados a C. laticollis, pero que morfológicamente diferían de la especie asignada y del resto de las especies del género. Por lo tanto, en este artículo se describe C. inconsiderata sp. nov y se discute sobre su relación con otras especies de Callyntra, su variabilidad morfológica, dimorfismo sexual y conservación.
Tipo: Journal article
Palavras-chave: Distribución; Callyntra laticollis; Callyntra paulseni; Nycteliini; Pimeliinae; Conservación.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200175

Calmodulin and Calcium-release Channels
Provedor de dados: 48
Autores: KASRI,NAEL NADIF; PARYS,JAN B.; CALLEWAERT,GEERT; MISSIAEN,LUDWIG; DE SMEDT,HUMBERT.
Calmodulin (CaM) is a ubiquitous cytosolic protein that plays a critical role in regulating cellular functions by altering the activity of a large number of ion channels. There are many examples for CaM directly mediating the feedback effects of Ca2+ on Ca2+ channels. Recently the molecular mechanisms by which CaM interacts with voltage-gated Ca2+ channels, Ca2+-activated K+ channels and ryanodine receptors have been clarified. CaM plays an important role in regulating these ion channels through lobe-specific Ca2+ detection. CaM seems to behave as a channel subunit. It binds at low [Ca2+] and undergoes conformational changes upon binding of Ca2+, leading to an interaction with another part of the channel to regulate its gating. Here we focus on the...
Tipo: Journal article
Palavras-chave: Calmodulin calcium channels inositol 1; 4; 5-trisphosphate receptor.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400011

Calpún-INIA, Cultivar de Lenteja (Lens culinaris Medik.) de Grano Grande y Resistente a Roya
Provedor de dados: 113
Autores: Peñaloza,Enrique; Tay U,Juan; France I,Andrés.
Calpún-INIA es un cultivar de lenteja (Lens culinaris Medik.) resistente a la roya (Uromyces fabae Pers.), desarrollado por el ex Programa de Leguminosas de Grano del Instituto Nacional de Investigaciones Agropecuarias (INIA), Chile. Se origina de un cruzamiento entre el cultivar chileno Araucana-INIA susceptible a la roya y el cultivar canadiense Laird resistente a roya, utilizando precocidad, arquitectura de planta del tipo Araucana-INIA, tamaño de grano, rendimiento de grano y resistencia a roya como criterios de selección. Calpún-INIA pertenece a los cultivares de tamaño de grano grande (tipo macrosperma), con peso promedio de 8 g por 100 granos, y con tamaño de grano de 7 mm superior a 65%. La semilla es parcialmente aplanada, de color verde claro a...
Tipo: Journal article
Palavras-chave: Araucana-INIA; Laird.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000100008

Cama de Broiler y Grano de Cebada Entero o Molido en Raciones de Engorda Invernal de Novillos
Provedor de dados: 113
Autores: Rojas G,Claudio; Manríquez B,Moisés.
El estudio tuvo el objetivo de evaluar la respuesta animal al consumo de raciones de engorda formuladas con cama de broiler y grano de cebada (Hordeum vulgare L.) entero o molido incorporado al ensilaje de praderas de ballica-trébol blanco (Lolium perenne L.-Trifolium repens L.) al momento de su elaboración. Los tratamientos fueron: 1) ensilaje, cama de broiler y grano de cebada molido, mezclados al momento de la alimentación invernal; 2) ensilaje adicionado con cama de broiler al momento de ensilar y grano de cebada molido adicionado al momento de la alimentación invernal; 3) ensilaje adicionado con cama de broiler y grano de cebada molido al momento de ensilar; y 4) ensilaje adicionado con cama de broiler y grano de cebada entero al momento de ensilar....
Tipo: Journal article
Palavras-chave: Grano de cebada entero; Novillos; Ensilaje de pradera.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000100012

Cambio del uso del suelo en el centro sur de Chile a fines del siglo XX: Entendiendo la dinámica espacial y temporal del paisaje
Provedor de dados: 97
Autores: AGUAYO,MAURICIO; PAUCHARD,ANÍBAL; AZÓCAR,GERARDO; PARRA,OSCAR.
Los humanos han transformado gran parte de la superficie del planeta en los últimos 300 años. La tala de bosques, las prácticas agrícolas de subsistencia, la intensificación de la producción agrícola y la expansión de los centros urbanos han cambiado drásticamente el paisaje. En el centro y sur de Chile las transformaciones han estado asociadas, en un inicio, a la expansión de la frontera agropecuaria que permitió satisfacer tanto las necesidades internas como la creciente demanda externa por productos agrícolas. Posteriormente, un fuerte incentivo a la forestación, comandado por el Estado, generó un acelerado proceso de desarrollo forestal que explica, en gran medida, la actual configuración del paisaje en esta región. En este trabajo hemos analizados la...
Tipo: Journal article
Palavras-chave: Cambio de uso del suelo; Chile; Desforestación; Dinámica del paisaje.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300004

Cambios de largo plazo en el paisaje y los ensambles de micromamíferos y rapaces en Chile central
Provedor de dados: 97
Autores: PAVEZ,EDUARDO F; LOBOS,GABRIEL A; JAKSIC,FABIAN M.
San Carlos de Apoquindo, en la precordillera de Chile central, es una localidad con estudios de larga data en vertebrados (ca. 30 años), situación favorable para el análisis de procesos de largo plazo que operan sobre dichos ensambles. En este contexto estudiamos la trayectoria del uso del suelo mediante imágenes satelitales LANDSAT, correspondientes a 1975, 1989 y 2003 y su presunto efecto sobre la vegetación, micromamíferos y aves rapaces. El análisis de las imágenes satelitales revela una expansión acelerada del área urbana en desmedro del suelo agrícola y matorrales naturales. Las especies de micromamíferos nativos de talla reducida y media no evidencian grandes variaciones de abundancia durante el período de estudio pero las de mayor tamaño redujeron...
Tipo: Journal article
Palavras-chave: Ecología del paisaje; Especies invasoras; Especies nativas; Tendencias temporales.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000100006

Cambios en el pelaje del roedor subterráneo Ctenomys talarum: posible mecanismo térmico compensatorio
Provedor de dados: 97
Autores: CUTRERA,ANA P; ANTINUCHI,CARLOS D.
En este trabajo se evaluaron los cambios en densidad y longitud del pelaje dorsal y ventral en el roedor subterráneo Ctenomys talarum, como posible mecanismo compensatorio frente a cambios de temperatura estacionales en el ambiente de la cueva, en especial durante la época estival, y durante el período de preñez en las hembras, ya que ambas etapas representan desafíos para la termorregulación en esta especie. Se observó que el pelaje ventral fue significativamente más corto y menos denso que el dorsal en machos, hembras preñadas y hembras no preñadas en las dos estaciones evaluadas. La longitud del pelaje tanto dorsal como ventral en los tres grupos fue significativamente menor durante la estación de temperaturas más cálidas. En la estación cálida, las...
Tipo: Journal article
Palavras-chave: Pelaje; Ambiente subterráneo; Disipación.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000200003

Cambios en la estructura cuticular Ornithodoros erraticus hembra durante el proceso de alimentación
Provedor de dados: 72
Autores: Arrieta,Marina Patricia; Ferrándiz,Santiago; Rayón,Emilio; López,Juan.
Los ácaros ectoparásitos son parásitos que aumentan su tamaño en varios órdenes de magnitud cuando se alimentan y alcanzan su estado adulto. Esclarecer los mecanismos por los cuales una cutícula rígida puede adaptarse a un aumento de volumen importante, cobra importancia para el diseño de fórmulas que bloquen dicho crecimiento y por lo tanto el desarrollo de estos parásitos, y como modelo para el desarrollo de nuevos biomateriales. En este trabajo se realizó una investigación morfológica y química de la cutícula de ácaros Ornithodoros erraticus hembra en estado adulto en ayunas y alimentadas. Mediante imágenes de microscopía electrónica de barrido se muestra que la morfología en forma de pliegues permite un estiramiento de la cutícula en todos los ejes del...
Tipo: Journal article
Palavras-chave: Ornithodoros erraticus; Ácaro; Cutícula.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100006

Cambios en la morfometría bucal y su relación con la dieta de Thyrsites atun (Euphrasen, 1791) en el centro-sur de Chile
Provedor de dados: 97
Autores: DUARTE,FREDDY; IBÁÑEZ,CHRISTIAN M; CHONG,JAVIER.
Varias especies de peces carnívoros, a medida que crecen, tanto el tamaño corporal como el de la boca, se relacionan positivamente con el tamaño de las presas. Sin embrago, el número y la biomasa de las presas consumidas por los peces no presentan un patrón tan claro. Para verificar estas relaciones en el pez Thyrsites atun, se recolectaron entre los meses de febrero y abril de 2004, un total de 140 ejemplares, desde desembarques de naves pesqueras industriales y semiindustriales en la región centro-sur de Chile. Se estableció la dieta de T. atun mediante descriptores cuantitativos de frecuencia, número y peso de las presas, los cuales se compararon entre peces subadultos y adultos. También registramos medidas morfométricas bucales para compararlas con el...
Tipo: Journal article
Palavras-chave: Thyrsites atun; Morfometría bucal; Tamaño corporal; Alimentación; Cardúmenes de peces.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400002

CAMBIOS EN LA PRODUCCION Y COMPOSICION LACTEA POR EFECTO DEL INCREMENTO DE CÉLULAS SOMÁTICAS EN LECHE DE VACAS.
Provedor de dados: 113
Autores: Pedraza G.,Carlos; Mansilla M.,Alberto; Fajardo R.,Paola; Agüero E.,Hernán.
Se realizó un estudio en cinco lecherías de la Zona Central y Sur de Chile, destinado a establecer el efecto de concentraciones crecientes de células somáticas sobre la producción y composición de leche de vacas. Se utilizó la información proveniente de controles sistemáticos mensuales, de cada uno de los animales pertenecientes a los rebaños experimentales, siendo manejada en una base computacional específicamente diseñada para dicho fin. A partir de los antecedentes registrados en dos años de recopilación, se estudiaron las relaciones existentes entre el recuento de células somáticas y la producción y composición de la leche, lográndose establecer un modelo general de ajuste (y = a + bx + cx², donde a, b, c son parámetros, y = Sólidos totales (ST),...
Tipo: Journal article
Palavras-chave: Calidad de leche; Lechería; Producción de leche.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000300005

Cambios Morfológicos en la Ontogenia Temprana de Chirostoma riojai
Provedor de dados: 77
Autores: Alarcón-D,Iván; Castillo-Rivera,Manuel Arnoldo; Arroyo-Cabrales,Joaquin; Figueroa-Lucero,Gerardo.
El charal de Toluca Chirostoma riojai es un pez de alto valor cultural e ictiológico. Los trabajos sobre esta especie se enfocan en el tipo de alimentación o forman parte de revisiones taxonómicas y son pocos los estudios sobre los cambios morfológicos durante su ontogenia. Se evaluó la figura de C. riojai mediante morfometría geométrica desde su eclosión hasta los 90 días de vida. Los ejemplares se cultivaron en condiciones controladas y fueron fijados 171 organismos pertenecientes a 11 intervalos de edad incluidos en cinco fases: embrión libre, apterolarva, pterolarva, juvenil y adulto. Se usaron seis puntos anatómicamente homólogos en una primera configuración de marcas y en una segunda se delinearon dos contornos (dorsal y ventralmente) de la región...
Tipo: Journal article
Palavras-chave: Morfometría geométrica; Figura; Ontogenia temprana; Chirostoma.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100052

Cambios Morfológicos en la Regeneración del Tendón Calcáneo de Rata (Sprague Dawley) por la Aplicación de Ultrasonido Continuo
Provedor de dados: 77
Autores: Schencke,Carolina; del Sol,Mariano.
Las lesiones de los tendones plantean siempre grandes problemas clínicos y terapéuticos, por su importancia funcional y su peculiar cicatrización. El apoyo fisiátrico, específicamente el tratamiento con ultrasonido, ha demostrado ser eficiente en la regeneración del tendón calcáneo. Este trabajo tuvo como objetivo analizar morfológicamente los efectos del uso de ultrasonido continuo en la regeneración post quirúrgica del tendón calcáneo de rata. Se utilizaron 15 ratas albinas, Sprager Dawle. Luego de 48 horas post tenorrafia se comenzó con una sesión diaria de ultrasonido terapéutico con una intensidad de 1W/cm², frecuencia de 3 MHZ, cabezal de 0,5 cm de ERA, por 30 segundos durante 10 días. Las ratas fueron sacrificadas 48 horas después de terminar las...
Tipo: Journal article
Palavras-chave: Tendón calcáneo; Ultrasonido; Morfología; Regeneración tendinosa.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200043

CAMBIOS PRODUCIDOS EN UN SUELO BAJO LABRANZA CONSERVACIONISTA Y SIEMBRA DIRECTA DE ALGODÓN EN EL CHACO, ARGENTINA
Provedor de dados: 113
Autores: Prause,Juan; Soler,Jorge.
El cultivo del algodón (Gossypium hirsutum L.) representa el 49% de la superficie de cultivos anuales en la Provincia del Chaco, Argentina; en los últimos 7 años, en algunas zonas del sudoeste chaqueño se ha difundido el sistema de siembra directa en algodón, en oposición a los sistemas de labranzas tradicionales. Con el objeto de evaluar los efectos que sobre un suelo Argiustol údico tienen la labranza conservacionista (LC) y la siembra directa (SD) en algodón, se determinaron humedad presente, densidad aparente, pH, materia orgánica, fósforo asimilable, calcio, magnesio, sodio y potasio intercambiables. Los resultados obtenidos indican que SD provocó un incremento en la densidad aparente y en valores de pH en la profundidad de 0 - 15 cm. No se apreciaron...
Tipo: Journal article
Palavras-chave: Sistemas alternativos; Propiedades del suelo; Algodón.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000400016

Cambios temporales en la abundancia y composición del ensamble de aves acuáticas en tranques artificiales en Chile central
Provedor de dados: 72
Autores: Peña-Villalobos,Isaac; Fibla,Pablo; Salazar,Juan-Esteban; Sallaberry A,Michel.
La zona central de Chile se caracteriza por ser un ambiente de tipo mediterráneo con marcada estacionalidad climática. En esta zona de gran actividad agrícola existen tranques artificiales destinados al regadío, los cuales pueden generar ambientes que constituyen hábitats alternativos para el desarrollo y nidificación de aves acuáticas. A pesar de la existencia de datos censales en este tipo de tranques, no se han realizado trabajos que aborden la estacionalidad climática como un factor implicado en la variación temporal de la abundancia y del ensamble ornitológico. En este trabajo, se estudiaron los cambios temporales de las comunidades de aves en dos tipos de tranques en la Región Metropolitana (33° 29' S - 70° 54' W): un tranque de tipo estacional con...
Tipo: Journal article
Palavras-chave: Aves acuáticas; Estacionalidad; Índice de aridez de Martonne; Humedales; Tranques.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300002

Can Formaldehyde Exposure Induce Histopathologic and Morphometric Changes on Rat Kidney?
Provedor de dados: 77
Autores: Golalipour,Mohammad Jafar; Azarhoush,Ramin; Ghafari,Soraya; Davarian,Ali; Fazeli,Seyyed Amirhossein.
Formaldehyde is used traditionally for fixing the cadaver, and vaporized during dissection and practical studying on cadaver. This study was designed to determine the histopathologic and morphometric changes of rat kidney while all of the experiments were exposed to formaldehyde for 18 weeks. 28 male albino Wistar rats were divided into the following three experimental groups (E1: 2hrs/d, 2d/w; E2: 2hrs/d, 4d/w; E3: 4hrs/d, 4d/w) and one control group (C). when the exposure period was expired the animals were anaesthetized with chloroform. After cervical dislocation, the abdomen was dissected and the kidneys were taken. The kidney specimens were sectioned and stained with Haematoxylin and Eosin technique for histologic and morphometric study. Data were...
Tipo: Journal article
Palavras-chave: Formaldehyde; Exposure; Histology; Kidney; Rat; Morphometry.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400037

Can insect data be used to infer areas of endemism?: An example from the Yungas of Argentina
Provedor de dados: 97
Autores: NAVARRO,FERNANDO R; CUEZZO,FABIANA; GOLOBOFF,PABLO A; SZUMIK,CLAUDIA; LIZARRALDE DE GROSSO,MERCEDES; QUINTANA,M. GABRIELA.
The main purpose of this study is to analyze whether areas of endemism can be characterized quantitatively by using insects, which are typically much more poorly sampled than vertebrates or plants. For this, an optimality criterion in the search for endemic areas was used to analyze approximately 1,100 georeferences from 288 species of holometabolous insects found in the study region, the Yungas (a very moist, montane rainforest), located in north-western Argentina. The optimality criterion is implemented with the programs NDM/VNDM, used to evaluate areas of endemism (i.e. a set of cells defined by two or more endemic species). Five grid sizes were used, three square (Iº, 0.5°, and 0.25°) and two rectangular (0.25° x 0.5° and 0.5° x 0.25°). In agreement...
Tipo: Journal article
Palavras-chave: Biogeography; Distribution patterns; Montane forests; NDM/VNDM.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400006

Can owners afford humanitarian donations in agbiotech - The case of genetically engineered eggplant in India
Provedor de dados: 69
Autores: Kolady,Deepthi; Lesser,William.
Are humanitarian donations in agbiotech economically feasible for the donor? We address this question by conducting an ex ante analysis of genetically engineered (GE) eggplant in India. Our analysis indicates that it is economically viable for a firm to donate the technology for poor farmers&amp;#8217; use by restricting use to open pollinated varieties while selling hybrid verities. By extension, this means of segmenting markets would likely apply in cases where different levels of production technologies are used based on access to market, irrigation, and credit, at least for perishable crops.
Tipo: Journal article
Palavras-chave: Bt eggplant; Market segmentation; Public-private partnership.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200002

Can painting human cells with exogenous maltoporin enable efficient therapeutic gene transfer by bacteriophage lambda vectors?
Provedor de dados: 69
Autores: Tolmachov,Oleg.
Many gene therapy strategies require transfer of high-molecular weight DNA into human cells. To enable clinical trials, these vectors need to be produced on a large scale and at low cost. The production of effective high-capacity vectors like HSV-amplicons and helper-dependent adenoviral vectors is difficult to up-scale, so new inexpensive vectors are needed for the efficient delivery of high-molecular weight DNA to human cells. Bacteriophage lambda vectors can accommodate up to about 46 kb of therapeutic DNA and can be easily produced in an industrial setting. However, the lambda vectors transfer DNA into mammalian cells with only a low efficiency. It was shown that bacteriophage lambda virions ejected their DNA in the presence of the purified receptor...
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400012

Can the Intermittent Training Generate Alterations on the Liver Tissue of Rats Submitted to a Hyperlipidic Diet?
Provedor de dados: 77
Autores: Magalhães,Alan José Barbosa; Castoldi,Robson Chacon; Camargo,Regina Celi Trindade; Ozaki,Guilherme Akio Tamura; Costalonga,Regiane Rocha; Moreira,Rafael Junges; Seraphim,Patricia Monteiro; Camargo Filho,José Carlos Silva.
Studies indicate that increasing physical activity and decreasing levels of fat in the liver help to decrease the risk of morbidity from liver conditions. This study aimed to evaluate the effects of an eight week intermittent training program on the liver tissue of rats subjected to a hyperlipidic diet. The study consisted of 30 male Wistar rats, divided into the following groups: Sedentary Control (SC) Exercise Control (EC) (fed on standard feed and water) Sedentary Obese (SO) and Exercise Obese (EO) (fed on bacon, ham, sausage, biscuits, soda and standard feed), which performed intermittent training through electrically stimulated jumps, with three sets of 12 repetitions, three times per week for eight weeks. At the end of the training period, the...
Tipo: Journal article
Palavras-chave: High fat diet; Exercise; Hepatocytes.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100014

Can widely used cell type markers predict the suitability of immortalized or primary mammary epithelial cell models?
Provedor de dados: 48
Autores: Ontsouka,Edgar Corneille; Bertschi,Janique Sabina; Huang,Xiao; Lüthi,Michael; Müller,Stefan; Albrecht,Christiane.
BACKGROUND: Mammary cell cultures are convenient tools for in vitro studies of mammary gland biology. However, the heterogeneity of mammary cell types, e.g., glandular milk secretory epithelial or myoepithelial cells, often complicates the interpretation of cell-based data. The present study was undertaken to determine the relevance of bovine primary mammary epithelial cells isolated from American Holstein (bMEC US) or Swiss Holstein-Friesian (bMEC CH) cows, and of primary bovine mammary alveolar epithelial cells stably transfected with simian virus-40 (SV-40) large T-antigen (MAC-T) for in vitro analyses. This was evaluated by testing their expression pattern of cytokeratin (CK) 7, 18, 19, vimentin, and &amp;#945;-smooth muscle actin (&amp;#945;-SMA....
Tipo: Journal article
Palavras-chave: Cell characterization; Flow cytometry; Gene expression; Lactation marker; Mammalian; Mammary epithelial cell.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100001

Cáncer de Colon y Recto: Descripción Morfológica y Clínica de 322 Casos
Provedor de dados: 77
Autores: Tapia E,Oscar; Roa S,Juan Carlos; Manterola D,Carlos; Bellolio J,Enrique.
El cáncer de colon y recto (CCR) es actualmente la cuarta causa de muerte por cáncer en Chile. Su incidencia, sin embargo, está aumentando continuamente en nuestra población. El objetivo de este estudio es describir aspectos morfológicos y clínicos de pacientes resecados por CCR. Estudio de cohorte retrospectiva. Se estudiaron 322 pacientes intervenidos por CCR entre 1987 y 2003 en el Hospital Hernán Henríquez Aravena de Temuco. Las variables clínicas y morfológicas estudiadas (todas ellas analizadas para los subgrupos de sujetos con tumores de colon y de recto) fueron edad, género, localización tumoral, forma y tamaño tumoral, nivel de infiltración, tipo histológico, grado de diferenciación histológico y compromiso tumoral de nodos linfáticos. Se...
Tipo: Journal article
Palavras-chave: Cancer colorectal; Cáncer de colon; Cáncer de recto.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200010

Cancer stem cells - the current status of an old concept: literature review and clinical approaches
Provedor de dados: 48
Autores: Fulawka,Lukasz; Donizy,Piotr; Halon,Agnieszka.
As regards their morphology and biology, tumours consist of heterogeneous cell populations. The cancer stem cell (CSC) hypothesis assumes that a tumour is hierarchically organized and not all of the cells are equally capable of generating descendants, similarly to normal tissue. The only cells being able to self-renew and produce a heterogeneous tumour cell population are cancer stem cells. CSCs probably derive from normal stem cells, although progenitor cells may be taken into consideration as the source of cancer stem cells. CSCs reside in the niche defined as the microenvironment formed by stromal cells, vasculature and extracellular matrix. The CSC assays include FACS sorting, xenotransplantation to immunodeficient mice (SCID), incubation with Hoechst...
Tipo: Journal article
Palavras-chave: Cancer stem cells; Stem cells; Tumour-initiating cells; Tumour-propagating cells; Carcinogenesis; Tumour heterogeneity; Clonal evolution.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100060

Cancro resinoso del pino: ¿una amenaza potencial para las plantaciones de Pinus radiata en Chile?
Provedor de dados: 73
Autores: Carrasco,Angela; Sanfuentes,Eugenio; Durán,Álvaro; Valenzuela,Sofía.
RESUMEN Fusarium circinatum es el hongo causante de la enfermedad "cancro resinoso" (pitch canker), que afecta numerosas especies de coníferas. En esta revisión se describe el estado del arte de F. circinatum a nivel mundial y su situación actual en Chile, abarcando antecedentes del patógeno y de la enfermedad. En Chile, el patógeno fue detectado en setos de Pinus radiata a fines de 2001, encontrándose hoy presente en 39 viveros de un total de 196, ubicados entre las regiones de O'Higgins y de Los Ríos. Después de 14 años de la detección de F. circinatum en Chile, el patógeno no ha presentado diseminación en las plantaciones comerciales de P. radiata. Se destacan las medidas para el manejo integrado de la enfermedad, donde la resistencia genética sería la...
Tipo: Journal article
Palavras-chave: Fusarium circinatum; Enfermedades en viveros; Resistencia genética.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200369

Candidate genes and pathogenesis investigation for sepsis-related acute respiratory distress syndrome based on gene expression profile
Provedor de dados: 48
Autores: Wang,Min; Yan,Jingjun; He,Xingxing; Zhong,Qiang; Zhan,Chengye; Li,Shusheng.
BACKGROUND: Acute respiratory distress syndrome (ARDS) is a potentially devastating form of acute inflammatory lung injury as well as a major cause of acute respiratory failure. Although researchers have made significant progresses in elucidating the pathophysiology of this complex syndrome over the years, the absence of a universal detail disease mechanism up until now has led to a series of practical problems for a definitive treatment. This study aimed to predict some genes or pathways associated with sepsis-related ARDS based on a public microarray dataset and to further explore the molecular mechanism of ARDS RESULTS: A total of 122 up-regulated DEGs and 91 down-regulated differentially expressed genes (DEGs) were obtained. The up- and down-regulated...
Tipo: Journal article
Palavras-chave: Acute respiratory distress syndrome; Sepsis; Differentially expressed mRNAs; Functional enrichment analysis; Pathway analysis; Transcription factors.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100025

CAPACIDAD COMBINATORIA PARA RENDIMIENTO DE GRANO Y CARACTERES DE CALIDAD MALTERA EN CEBADA (Hordeum vulgare L.)
Provedor de dados: 113
Autores: Rivas P.,Rudy; Barriga B.,Patricio.
Se cruzaron seis genotipos de cebada de ciclo de desarrollo primaveral en un arreglo dialelo, con el fin de estudiar sus capacidades combinatorias para rendimiento de grano y doce caracteres de calidad maltera. El comportamiento de los híbridos F1 fue analizado utilizando el Modelo I, método 2 de Griffing. El análisis de capacidad combinatoria general (CCG), de capacidad combinatoria específica (CCE) y la relación CCG/CCE, demostraron que ocho de los trece caracteres estudiados mostraron expresión asociada a efectos génicos de tipo aditivo, que fueron: peso de grano, extracto de malta, viscosidad, friabilidad, proteína de la malta, proteína soluble, índice de Kolbach y amino nitrógeno libre (FAN: free amino nitrogen). Por otra parte en la expresión de los...
Tipo: Journal article
Palavras-chave: Capacidad combinatoria; Calidad maltera.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000300001

Capital Humano en Ciencias
Provedor de dados: 48
Autores: DELGADO A,RICARDO.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000100002

Característica de la Composición Corporal de Agresores y Víctimas de Bullying
Provedor de dados: 77
Autores: Levandoski,G; Cardoso,F. L.
El objetivo fue verificar la composición corporal de escolares agresores y víctimas de bullying. Participaron en el estudio 184 alumnos de sexo masculino con media etaria de 12,77 años pertenecientes a una escuela de enseñanza pública de la ciudad de Florianópolis, Brasil. Fueron utilizados el Cuestionario para el Estudio de Violencia entre Pares, un examen socio-métrico, observación y el somatotipo. El análisis estadístico fue realizado a través del programa SPSS versión 14.0, con nivel de significancia fijado en p&lt;0,05. La incidencia de alumnos partícipes en bullying fue 28,3%, donde 14,1%, 4,3% y 9,8% eran víctimas, agresores/víctimas y agresores, respectivamente. En relación a la clasificación del somatotipo, las víctimas obtuvieron clasificación...
Tipo: Journal article
Palavras-chave: Bullying; Composición corporal; Somatotipo; Niños y adolescentes; Educación física.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400009

Características Anatómicas del Tendón Extensor Accesorio del Dedo Anular, Procedente del Músculo Extensor del Dedo Mínimo
Provedor de dados: 77
Autores: de Mendonça,Rodas, P. M.; Rocha,A. C.; Buarque de,Gusmão, L.; Sousa-Rodrigues,C. F.; Olave,E.
El músculo extensor del dedo mínimo es una larga y estrecha lámina muscular que se origina en el epicóndilo lateral del húmero, en el tendón extensor común, insertándose, generalmente, a través de dos cintillas tendinosas, en la expansión extensora del dedo mínimo. A veces, emite un tendón accesorio para el dedo anular.El objetivo del presente estudio fue conocer la incidencia, disposición y trayecto de este tendón accesorio. Se estudiaron 60 piezas de miembros superiores, fijadas en formaldehído al 10 %, correspondientes a cadáveres de individuos brasileños, adultos, de ambos sexos. El tendón accesorio fue encontrado en 7 manos (11,7% de los casos). La presencia de ese tendón tiene importancia funcional y clínico-quirúrgica, pues en casos de lesiones en...
Tipo: Journal article
Palavras-chave: Mano; Músculos extensores; Tendones; Ortopedia.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400034

Características Anatómicas y Biométricas del Apéndice Vermiforme en Niños Chilenos Operados por Apendicitis Aguda
Provedor de dados: 77
Autores: Verdugo,Rodrigo; Olave,Enrique.
Las características biométricas del apéndice vermiforme no son constantes en el ser humano, así como tampoco lo es su posición. Los datos sobre sus variaciones aún son limitados, pero muestran la existencia de diferencias dependiendo de la región geográfica y racial de los individuos. En Latinoamérica no existen estudios anatómicos in vivo publicados por lo que las referencias se basan sólo en observaciones post mortem. El presente estudio tuvo como objetivo determinar y describir las características biométricas y posiciones anatómicas del apéndice vermiforme. Para ello se realizaron observaciones directas y mediciones del apéndice vermiforme en 65 niños chilenos, 37 de sexo masculino y 28 del femenino, operados por apendicitis aguda en los hospitales...
Tipo: Journal article
Palavras-chave: Apéndice vermiforme; Anatomía; Biometría.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200045

Características Antropométricas, Composición Corporal y Somatotipo de Jugadores de Tenis de Mesa de Alto Nivel
Provedor de dados: 77
Autores: Pradas de la Fuente,Francisco; González Jurado,José Antonio; Molina Sotomayor,Edgardo; Castellar Otín,Carlos.
El objetivo de este estudio fue describir las características antropométricas, la composición corporal y el somatotipo de una muestra internacional de jugadores de tenis de mesa de alto nivel clasificados entre los 150 mejores jugadores del mundo. En el estudio participaron un total de 31 jugadores (18 varones y 13 mujeres) de categoría absoluta. Todos los deportistas analizados en el estudio competían de manera regular en la Superdivisión, máxima categoría de la liga española y en pruebas internacionales de carácter oficial (ETTU e ITTF). La muestra fue distribuida en dos grupos atendiendo al sexo. Un total de 16 variables antropométricas fueron evaluadas. Se encontraron diferencias estadísticamente significativas en la masa, talla, IMC (p&lt;0,01), en...
Tipo: Journal article
Palavras-chave: Tenis de mesa; Elite; Antropometría; Composición corporal; Somatotipo.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400033

Características Antropométricas de Adolescentes Pertenecientes a Distintas Escuelas Deportivas Formativas
Provedor de dados: 77
Autores: Godoy-Cumillaf,Andrés Esteban Roberto; Valdés-Badilla,Pablo Antonio; Salvador Soler,Noemí; Carmona-López,María Inés; Fernández,Juan José.
La alta tasa de sedentarismo y obesidad reportada en Chile, ha propiciado la aparición de diversos programas deportivos para niños y adolescentes, que requieren evaluaciones fiables en torno a las características antropométricas por disciplina Deportiva. En este sentido, la presente investigación pretende por objetivo determinar las características antropométricas de adolescentes pertenecientes a distintas escuelas deportivas formativas (AD) de Temuco, Chile y su relación con parámetros deportivos ideales. El tipo de investigación contempla un diseño no experimental, descriptivo, transversal, con un enfoque cuantitativo. La muestra estuvo constituida por 65 sujetos (38 mujeres) con un promedio de edad de 15,9 (2,5) años y un IMC de 22,8 (4) kg/m2, quienes...
Tipo: Journal article
Palavras-chave: Somatotipo; Composición corporal; Estado nutricional; Índice de masa corporal; Taekwondo; Racquetbol; Esgrima; Karate; Atletismo; Tenis y Fútbol.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300041

Características Antropométricas de Futbolistas Profesionales Chilenos
Provedor de dados: 77
Autores: Jorquera Aguilera,Carlos; Rodríguez Rodríguez,Fernando; Torrealba Vieira,María Ignacia; Campos Serrano,José; Gracia Leiva,Natalia; Holway,Francis.
La tendencia en la formación en el futbol, determina que las variables antropométricas sean importantes al momento de definir entre otras cosas, la posición de juego más idónea. Estos parámetros morfológicos son una parte esencial de la evaluación y selección de los deportistas. Estos patrones permiten determinar la evolución física del futbolista desde temprana edad, lo que ayuda enormemente en la intervención de los mismos. Se evaluó antropométricamente, a un total de 406 futbolistas profesionales, pertenecientes a 15 clubes chilenos, de los cuales 12 pertenecen a Primera División y 3 clubes a Primera B. Existen diferencias en algunas variables antropométricas básicas por posición de juego, que nos ponen en desventaja frente a otros jugadores...
Tipo: Journal article
Palavras-chave: Antropometría; Futbol; Posición de juego.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200042

Características Antropométricas de los Jugadores Españoles de Voley Playa: Comparación por Categorías
Provedor de dados: 77
Autores: Quiroga Escudero,Miriam Esther; Sarmiento Montesdeoca,Samuel; Palomino Martín,Antonio; Rodríguez Ruiz,David; García Manso,Juan Manuel.
El objetivo de este estudio fue determinar las características antropométricas del jugador español (hombres y mujeres) de voley playa y comparar el perfil antropométrico de estos deportistas en las diferentes categorías en las que se organiza la competición: Sub-19, Sub-21 y Absoluto. Fueron evaluados 150 jugadores (79 hombres y 71 mujeres) participantes en el Campeonato de España de voley playa celebrado en 2011. La estatura presentó valores que responden, en los hombres, a patrones evolutivos propios de edad y morfotipo (Sub19M: 184,50±6,95 cm; Sub21M: 182,89±7,28 cm; AbsM: 186,93±6,58 cm). Este comportamiento no se repitió entre las mujeres (Sub19F: 169,84±6,46 cm; Sub21F: 173,43±5,98 cm; AbsF: 175,28±6,17 cm). El peso muscular aumentó por cada...
Tipo: Journal article
Palavras-chave: Voley playa; Composición corporal; Somatotipo.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100004

Características Antropométricas por Posición de Juego en Mujeres Futbolistas Chilenas de la Región de Valparaíso, Chile
Provedor de dados: 77
Autores: Barraza,F; Yáñez,R; Báez,E; Rosales,G.
Participaron del estudio 76 mujeres futbolistas de la región de Valparaíso, las edades fluctuaron entre los 18 y 30 años. Fueron evaluados los equipos femeninos profesionales de los clubes Everton, Santiago Wanderers y San Luis de Quillota, las selecciones de la universidades de Valparaíso, Técnica Federico Santa María y Universidad Viña del Mar. Las posiciones de juego fueron distribuidas en arqueras (n= 8), defensas (n= 25), volantes (n= 24) y delanteras (n= 18). Para la evaluación de la composición corporal se utilizó el protocolo establecido por la International Society for the Advancement of Kinanthropometry. Para determinar el somatotipo de las futbolistas fue utilizado el modelo de Heath &amp;amp; Carter. Se fraccionó el peso corporal total a través...
Tipo: Journal article
Palavras-chave: Perfil antropométrico; Fútbol; Somatotipo; Mujer.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400005

Características Antropométricas y Fisiológicas de Adultos Mayores de la Comuna de Arica-Chile
Provedor de dados: 77
Autores: Díaz,Jorge; Espinoza-Navarro,Omar; Pino,Anita.
En Chile un 14% de la población se encuentra sobre los 60 años. El envejecimiento provoca modificaciones en el organismo, con disminución de masa muscular, pérdida de fuerza y alteraciones biofisiológicas. Los objetivos de este trabajo fueron determinar las características antropométricas y fisiológicas de adultos mayores, sobre los 50 años, activos y de niveles socioculturales medio, de la comuna de Arica-Chile. Cuarenta varones deportistas seniors, fueron divididos en grupo I, con edades de 50 a 59 años (n= 20) y grupo II, de 60 a 70 años (n= 20). Se determinaron, peso, talla, índice de masa corporal (IMC), perímetros y pliegues corporales. En muestra sanguínea se determinó glicemia, perfil lipídico, hematocrito y hemoglobina. El Comité de Ética/Bioética...
Tipo: Journal article
Palavras-chave: Adulto Mayor; Arica-Chile; Morfología; Patrones Fisiológicos.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200027

Características Biométricas de la Arteria Coroidea Anterior en su Segmento Cisternal
Provedor de dados: 77
Autores: Mandiola,Eduardo; Alarcón,Eduardo; Montero,Carolina; Pulleghini,Marcos; del Sol,Mariano; Olave,Enrique; Oñate,Juan C.
Las implicancias clínicas que tienen los procesos oclusivos de la Arteria Coroidea Anterior (AChA), son de considerable importancia y nos han motivado para efectuar su análisis biométrico incorporando algunos otros parámetros. Para su ejecución, se utilizaron cerebros inyectados con látex coloreado de rojo fijados en solución de formol, provenientes del Servicio Médico Legal, Santiago.Para su observación, se usó lupa luminiscente 4 X y las mediciones efectuadas con Caliper Mitutoyo Digital. Esta arteria se originó de la Carótida Interna (ACI) en un 83,3 % y en un 16,7 % de la Arteria Comunicante Posterior (ACoP ). El calibre medio observado en su origen fue de 0,68 ± 0,31 mm; en el tercio medio de 0,60 ± 0,21 mm; en el punto de entrada en el plexo coroideo...
Tipo: Journal article
Palavras-chave: Arteria coroidea anterior; Biometría; Índice cefálico; Arteria carótida interna.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300046

Características Biométricas de la Silla Turca en Telerradiografías Laterales de Individuos Mapuches y No Mapuches de la IX Región, Chile
Provedor de dados: 77
Autores: Henriquez,Jorge; Fuentes,Ramón; Sandoval,Paulo.
El cefalograma lateral es una radiografía que se usa rutinariamente en la ortodoncia. Este tipo de radiografía plana es la mejor opción para investigar las características morfométricas de la silla turca, determinando su tamaño y forma y sus eventuales variaciones. Taveras &amp;amp; Wood han descrito un método, para determinar el tamaño de la silla turca en radiografías. Midiendo el mayor diámetro anteroposterior de la silla turca y la profundidad de ella desde el punto más bajo a una línea que conecta la cima del dorso de la silla al tubérculo selar. Esto nos motivó llevar a cabo un estudio de estas características, para lo cual se registraron las correspondientes observaciones en 88 teleradiografias laterales, de las cuales correspondían a 44 individuos...
Tipo: Journal article
Palavras-chave: Silla turca; Hipófisis; Esfenoides.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200032

CARACTERÍSTICAS BIOMÉTRICAS DE LOS FORÁMENES NUTRICIOS EN LOS HUESOS HÚMERO, ULNA Y RADIO
Provedor de dados: 77
Autores: Collipal,L. E.; Olave,E.; Silva,M. H.
La ubicación de los forámenes nutricios en los huesos húmero, ulna y radio ha sido descrita de forma general. Con el propósito de complementar la información sobre estos forámenes, estudiamos su ubicación, nivel de posición del foramen en relación con la epífisis distal (húmero) y epífisis proximal ( ulna y radio) y longitud del surco en el foramen. Estos parámetros fueron correlacionados con la longitud del hueso. Utilizamos 90 huesos secos, en perfectas condiciones de conservación, 30 de cada uno, de individuos adultos, de ambos sexos, procedentes del Museo de la Unidad de Anatomía, Facultad de Medicina, Universidad de La Frontera, Temuco, Chile. El número más frecuente de forámenes nutricios encontrado en la mayoría de las muestras, fue 1. En el húmero...
Tipo: Journal article
Palavras-chave: Miembro superior; Huesos; Foramen nutricio.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000300007

Características Biométricas de los Huesos Metacarpianos en Individuos Chilenos
Provedor de dados: 77
Autores: Soto,A; Olave,E; Binvignat,O.
Los huesos metacarpianos son largos y cilíndricos, articulándose proximalmente con el carpo y distalmente con las falanges proximales de los dedos. Estos huesos han recibido especial atención en el área de la medicina forense para la determinación del sexo. Con el objetivo de aportar datos biométricos sobre los huesos metacarpianos en individuos chilenos, determinamos radiográficamente, en 52 manos de individuos de ambos sexos, la longitud de cada uno de ellos, el ancho de su base, cuerpo y cabeza. En los individuos de sexo masculino, la longitud promedio del I metacarpiano fue de 40,9 ± 6,4 mm y la del II metacarpiano de 60,8 ± 7,4 mm; en el sexo femenino el I metacarpiano tuvo un promedio de 39,2 ± 5,2 mm y el II metacarpiano de 60,6 ± 8,9 mm. El ancho...
Tipo: Journal article
Palavras-chave: Anatomía; Mano; Huesos metacarpianos.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300004

Características Biométricas de los Ligamentos Meniscofemorales en Individuos Chilenos
Provedor de dados: 77
Autores: Villarroel,G; Olave,E.
El conocimiento de los ligamentos meniscofemorales anterior y posterior (LMFA y LMFP) es de gran importancia para la anatomía y clínica quirúrgica. Con el propósito de efectuar un análisis de su frecuencia y biometría en individuos Chilenos, se disecaron 30 rodillas, de cadáveres de individuos adultos, de sexo no conocido, fijadas en formaldehído al 10 % y pertenecientes a los Laboratorios de Anatomía, de la Facultad de Medicina de la Universidad Católica del Maule, Chile. Utilizando un caliper digital se registraron medidas de longitud, ancho y espesor de los mismos a diferentes niveles. Todas las muestras fueron fotografiadas. En relación a la frecuencia, el LMFP se presentó en 21 casos (70 %) y el LMFA en 13 (43,4 %). La longitud promedio del LMFA fue...
Tipo: Journal article
Palavras-chave: Anatomía; Rodilla; Ligamento meniscofemoral anterior; Ligamento meniscofemoral posterior; Ligamento cruzado posterior.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300007

Características Biométricas de los Meniscos en Rodillas de Individuos Chilenos
Provedor de dados: 77
Autores: Torrez,J.C; Olave,M. C; Torrez,H. F; Olave,E.
Los meniscos son láminas cartilaginosas que contribuyen a ampliar la escasa concavidad de las superficies articulares de la tibia para recibir a los convexos cóndilos femorales. Satisfacen una necesidad funcional, lo que queda demostrado con su reconstitución después de su extirpación total. Con el propósito de aportar datos sobre sus características biométricas, se registraron diámetros anteroposteriores, transversal y de espesor a diversos niveles, para complementar la anatomía de los mismos en nuestra población. Para ello, se realizó un estudio en 20 meniscos, 10 laterales y 10 mediales, extraídos de cadáveres formolizados, de individuos adultos, chilenos, en los Laboratorios de Anatomía de la Universidad de La Frontera, los cuales se prepararon para...
Tipo: Journal article
Palavras-chave: Anatomía; Biometría; Articulaciones; Rodilla; Meniscos.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300058

Características Biométricas de los Osículos del Oído de Individuos Chilenos
Provedor de dados: 77
Autores: Binvignat,O; Meza,S; Torrez,J. C; Olave,E.
El crecimiento y desarrollo de los osículos del oído medio no muestran grandes variaciones después del nacimiento. Nuevas tecnologías en cirugía de implantes, corrección y tratamiento de las enfermedades del oído medio necesitan un detallado conocimiento biométrico de estos osículos. Basados en lo anterior, se estudiaron 22 Malleus, 16 Incus y 3 Estapedios de individuos adultos de sexo masculino, de cadáveres secos, todos individuos de la Región Central de Chile. Los osículos fueron analizados y fotografiados con un Microscopio quirúrgico de diagnóstico OPMI Pico, Carl Zeiss, imagen estereoscópica. Los datos métricos se obtuvieron con un calyper digital Mitutoyo y sometidos a análisis digital con el AxioVision LE 4.8.2.0. Software de Carl Zeiss. El malleus...
Tipo: Journal article
Palavras-chave: Anatomía; Biometría; Oído medio; Osículos.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300018

Características Biométricas del Cuerpo Calloso en Individuos chilenos
Provedor de dados: 77
Autores: Olave,E; Torrez,J. C; Riquelme,N; Ibacache,L; Binvignat,O.
El cuerpo calloso conecta ambos hemisferios cerebrales y se ubica en el fondo de la fisura longitudinal del cerebro. Con el propósito de complementar el conocimiento sobre esta importante estructura del sistema nervioso en nuestra población, determinamos diversos parámetros biométricos, que incluyeron su localización respecto a los márgenes anterior y posterior de los hemisferios cerebrales, longitud, espesor a diversos niveles, entre otras variables. Se utilizaron 20 cerebros frescos, de individuos adultos, a los cuales se fotografió la cara medial de sus hemisferios, los que fueron acompañados con una regla antes de obtener la fotografía, con el objetivo de trabajar sobre la imagen y, de este modo, registrar las variables planificadas. Estas medidas...
Tipo: Journal article
Palavras-chave: Anatomía; Sistema nervioso; Comisuras; Cuerpo calloso; Biometría.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400028

Características Cefalométricas en Jóvenes con Oclusión Normal y Perfil Armónico en Población Chilena
Provedor de dados: 77
Autores: Montt Rodriguez,Joaquín; Miquel Valdés,María Paz; Oyonarte Weldt,Rodrigo.
Las normas cefalométricas facilitan el diagnóstico y planificación terapéutica en ortodoncia, siendo estas obtenidas primariamente de población caucásica adulta. Dichas normas variarían entre etnias siendo escasa la información respecto de las de población chilena en crecimiento. Se obtuvo una muestra de 48 telerradiografías de perfil de individuos en crecimiento (23 mujeres y 25 hombres) con oclusión normal y perfil armónico de los registros de la Universidad de los Andes tomados entre Enero y Julio del año 2012, incluyendo 414 individuos. Las radiografías fueron analizadas cefalométricamente, obteniéndose valores de parámetros verticales y sagitales en tejidos blandos y duros. Se obtuvieron estadísticas descriptivas, y las diferencias entre sexos se...
Tipo: Journal article
Palavras-chave: Normas cefalométricas; Cefalometría en tejidos duros; Cefalometría en tejidos blandos; Normas cefalométricas chilenas.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100037

Características del establecimiento e historia de vida de Misodendrum punctulatum (Misodendraceae) un muérdago de Sudamérica austral
Provedor de dados: 97
Autores: Tercero-Bucardo,Norlan; Kitzberger,Thomas.
Aprovechando la formación de anillos anuales de crecimiento en los hospedadores y que el sistema haustorial de los muérdagos va quedando sincrónicamente embebido en el xilema del hospedador, analizamos características edad dependientes de la historia de vida y del establecimiento de Misodendrum punctulatum cuando infecta a dos especies deciduas de Nothofagus en el noroeste de la Patagonia, Argentina. La determinación de la edad de establecimiento de las infecciones fue realizada examinando el número de anillos anuales de crecimiento del hospedador, en cortes transversales de ramas o troncos principales de Nothofagus, atravesados por el haustorio más profundo. Concomitantemente, se registró el número de eventos anuales de crecimiento (índice de edad aérea)...
Tipo: Journal article
Palavras-chave: Endophytic system; Establishment; Misodendrum; Mistletoes; Annual tree rings; Nothofagus.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300010

Características Estereológicas del Hígado de Rata (Rattus norvergicus) sometidas a Menopausia Inducida por Ovariectomía
Provedor de dados: 77
Autores: Trujillo,Erick; Vásquez,Bélgica; del Sol,Mariano.
Durante la menopausia ocurren cambios hormonales, como disminución de estradiol y aumento de las hormonas folículo estimulante y luteinizante. En mujeres premenopáusicas la fibrosis y esteatosis hepática es menor que en mujeres postmenopáusicas, mejorando cuando se administra terapia hormonal de reemplazo. El objetivo del estudio fue determinar aspectos cuantitativos del hígado de ratas sometidas a un modelo experimental de menopausia inducida por ovariectomía. Utilizamos 10 ratas Sprague-Dawley (Rattus norvergicus) adultas, sanas. Las ratas fueron pesadas y divididas en dos grupos (ovariectomía bilateral=Grupo Ovx y control=Grupo Sham). A los 60 días fueron sacrificadas y retirado el hígado, obteniéndose un trozo de cada hígado. Se realizaron 5 cortes de...
Tipo: Journal article
Palavras-chave: Menopausia inducida; Ovariectomía; Hígado; Estereología; Rattus norvergicus.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400067

CARACTERÍSTICAS FÍSICAS DE SOLOS SALINO-SÓDICOS SUBMETIDOS A PARCELAMENTO DA LÂMINA DE LIXIVIAÇÃO
Provedor de dados: 127
Autores: Alberto Ruiz,Hugo; Arruda Sampaio,Regynaldo; Oliveira,Maurício de; Afonso Ferreira,Paulo.
O objetivo deste trabalho foi avaliar a influência do parcelamento da lâmina de lixiviação sobre as características físicas de solos salino-sódicos. Cilindros foram preenchidos com amostras de solos: NEOSSOLO FLÚVICO (Ae1); NEOSSOLO FLÚVICO, coletado a 0-20 cm (Ae2-s) e 20-50 cm (Ae2-i) de profundidade, e VERTISSOLO (V). O gesso foi incorporado até 15 cm de profundidade, numa quantidade equivalente a 100% da necessidade de gesso para substituição do sódio trocável. O manejo de água consistiu na aplicação de solução de lixiviação com CaCl2 e MgCl2 de uma única vez e do mesmo volume parcelado em duas, quatro e seis vezes, respectivamente, com intervalos de 22 dias entre cada aplicação. Verificou-se que o gesso e a lâmina de lixiviação diminuíram a dispersão...
Tipo: Journal article
Palavras-chave: Salinidade; Lixiviação de sais; Recuperação de solos.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000300001

Características Fisiológicas, Contenido de Aceite y Proteína en Genotipos de Soya, Evaluadas en Diferentes Sitios y Épocas de Cosecha, Brasil
Provedor de dados: 113
Autores: Minuzzi,Andréia; Mora,Freddy; Sedrez Rangel,Marco Antônio; De Lucca e Braccini,Alessandro; Scapim,Carlos Alberto.
El objetivo del presente estudio fue evaluar características fisiológicas, contenido de aceite y de proteínas en las semillas de cuatro cultivares de soya (Glycine max (L.) Merr.)) (BRS 133, BRS 206, BRS 239 y CD 202), colectadas en cuatro épocas (estado R7, 7, 14 y 21 días después de la primera época) y producidas en dos sitios, Sidrolândia (21º00’ lat. Sur, 55º01’ long. Oeste), y Dourados (22º11’ lat. Sur, 54º55’ long. Oeste) del Estado de Mato Grosso do Sul, Brasil, en la temporada agrícola 2004-2005. Se utilizó un diseño experimental de bloques completos al azar con tres repeticiones y con tratamientos en parcelas subdivididas. Las semillas fueron evaluadas a través de pruebas de germinación, envejecimiento acelerado y emergencia de las plantas en...
Tipo: Journal article
Palavras-chave: Germinación; Atraso de cosecha; Cultivares.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400003

Características Histológicas de la Piel de la Cara Volar del Pulgar en IndividuosChilenos con Desvanecimiento del Dactilograma
Provedor de dados: 77
Autores: Silva,Juan; Rojas,Mariana; Araya,Claudia; Villagra,Francisca.
En forma característica, la piel de manos y de pies presenta un diseño morfológico particular denominado dactilograma. Este patrón es característico de la piel gruesa de dígitos, palma de manos y plantas de pies y sus propiedades le permiten cumplir un rol protagónico en la identificación humana. No se han descrito los cambios que ocurren en la cara volar de pulgar debido al proceso de envejecimiento. Es por esta razón que el objetivo del presente trabajo fue evidenciar los cambios en la bioestructura de la piel de la cara volar del primer dígito de la mano derecha en individuos de edad avanzada. Para este estudio se utilizaron muestras de piel de pulgar derecho de individuos chilenos de ambos sexos y de edad avanzada. Estas muestras fueron sometidas a...
Tipo: Journal article
Palavras-chave: Dactilograma; Identificación humana; Medicina legal; Envejecimiento de la piel; Histología de la piel; Huella dactilar.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300047

Características histológicas de la tumefacción frontal de Melanophryniscus (Amphibia: Anura: Bufonidae)
Provedor de dados: 97
Autores: NAYA,DANIEL E.; LANGONE,JOSÉ A.; DE SÁ,RAFAEL O.
Se analizó la histología tegumentaria de la región cefálica en seis especies del género Melanophryniscus, pertenecientes a los grupos stelzneri (4) y tumifrons (2), con el objetivo de esclarecer la estructura de la tumefacción frontal y su posible función. Las características generales de la histología del grupo stelzneri, coincidieron con las descripciones tegumentarias existentes para el género. Sin embargo, la región cefálica frontal en las dos especies del grupo tumifrons muestran cambios histológicos correlacionados a la tumefacción frontal. Esta estructura presenta una organización similar a otras macroglándulas presentes en la dermis de anuros (e.g., parotoides, paracnémicas), y por tanto se propone el nombre de macroglándula frontal para la misma....
Tipo: Journal article
Palavras-chave: Glándulas; Histología; Melanophryniscus; Piel; Tegumento.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400002

Características Mecánicas Dinámicas de la Tibia Aislada de Perro Sometida a Prueba de Impacto
Provedor de dados: 77
Autores: Fioretti,C; Galán,A; Moine,R; Varela,M; Varela,P; Mouguelar,H; Gigena,S; Bonino,F; Quinteros,R; Natali,J.
El propósito del presente trabajo es brindar información acerca de las propiedades biomecánicas y morfológicas de la tibia de perro sometida a cargas dinámicas. Los objetivos fueron evaluar la resistencia de la tibia frente al impacto mediante el Método de Ensayo Charpy, relacionar la misma con el área total, el área cortical y el área de la cavidad medular del hueso, comparándola entre talla, edad y sexo diferente. La importancia clínica, ortopédica y quirúrgica que reviste la región de la pierna del perro fundamenta esta investigación. Se utilizaron tibias de perro en condiciones aisladas, extraídas postmortem de 30 animales mestizos adultos jóvenes provenientes del servicio de zoonosis de la ciudad de Río Cuarto. Se determinó en la tibia derecha e...
Tipo: Journal article
Palavras-chave: Perro; Tibia; Prueba de Impacto.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200033

Características Mecánicas Dinámicas del Fémur Aislado de Perro, Sometido a Prueba de Impacto
Provedor de dados: 77
Autores: Fioretti,C; Natali,J; Galán,A; Rivera,M. C; Moine,R; Varela,P; Varela,M; Bonino,F; Quinteros,R.
El presente trabajo tiene el propósito de brindar información acerca del comportamiento biomecánico del fémur de perro sometido a cargas dinámicas. El objetivo es evaluar la resistencia del fémur frente al impacto, mediante el Método de Ensayo Charpy, relacionando dicha resistencia con las áreas: total, cortical y cavidad medular del hueso, comparándola entre edad y sexo diferentes. Se utilizaron fémur de perro en condiciones aisladas, extraídos postmortem de 30 animales mestizos adultos, provenientes del servicio de zoonosis de la ciudad de Río Cuarto. Se determinó en los fémures derecho e izquierdo: peso y longitud total del hueso, diámetro cráneo-caudal y latero-medial en la mitad de la diáfisis. El fémur izquierdo fue osteotomizado transversalmente en...
Tipo: Journal article
Palavras-chave: Perro; Fémur; Prueba de impacto.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300009

Características Morfológicas de la Retina del Calderón Común (Globicephala melas; Traill, 1809) y su Relación con el Hábitat
Provedor de dados: 77
Autores: Mengual,R; Segovia,Y; García,M.
Existe una estrecha relación entre las características morfológicas de los sistemas sensoriales, su funcionamiento y el hábitat al que están adaptados los organismos. En este sentido, de todos los mamíferos marinos estudiados, los cetáceos son los que más profundamente han modificado su estructura y fisiología ocular por su estrecha adaptación a una vida exclusivamente acuática. Para aportar más datos a la literatura, el objetivo de este trabajo es describir morfológicamente la retina de la ballena piloto a través de técnicas de microscopia óptica, con el fin de relacionarla con su adaptación al medio acuático. Nuestros datos muestran que la retina de Globicephala melas se organiza de acuerdo al mismo plan básico de los vertebrados. Tiene un grosor medio...
Tipo: Journal article
Palavras-chave: Globicephala melas; Visión de cetáceos; Retina.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400044

Características Morfológicas de Ovarios y Ovocitos de Nutrias (Myocastor coypus) en Condiciones de Criadero
Provedor de dados: 77
Autores: Larocca,Clara; Fila,Danilo; Filipiak,Yael; Pérez,William.
El objetivo del presente trabajo fue estudiar las características morfológicas de los ovarios y ovocitos de la nutria (Myocastor coypus, coypu) en las diferentes estaciones del año y etapas del ciclo estral. La nutria (MC) es un roedor autóctono de Sudamérica, muy utilizado en la industria peletera. Se sacrificaron 20 hembras, de un peso promedio de 4996,2 g recogiéndose muestras vaginales para realizar colpocitología y determinar el momento del ciclo estral, 11 se faenaron en invierno de las cuales 7 estaban en anestro, 1 en proestro y 3 en diestro y 9 en verano, encontrándose 1 en anestro, 1 en proestro y 7 en diestro. Cada ovario fue transportado en una solución de cloruro de sodio isotónico estéril a 37C al laboratorio. Los ovarios fueron pesados y...
Tipo: Journal article
Palavras-chave: Nutrias; Ovocitos; Ovarios.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200020

Características Morfológicas Métricas y No Métricas del Esternón del Individuo Mapuche
Provedor de dados: 77
Autores: del Sol,Mariano; Vásquez,Bélgica; Cantín,Mario.
El objetivo fue describir las características morfológicas métricas y no métricas del esternón de individuos Mapuche de sexo masculino y comparar estos parámetros con otras poblaciones del mundo. Se realizó un estudio descriptivo sobre 50 esternones secos de individuos Mapuche adultos de la región de la Araucanía, Chile, con edades comprendidas entre los 20 y 84 años. La longitud del esternón se midió en milímetros como la distancia combinada del manubrio y el cuerpo del esternón desde la incisura yugular a la unión xifoesternal, junto a la longitud del manubrio y cuerpo del esternón de manera independiente a lo largo del plano mediosagital. Para el proceso xifoides, se determinó también su longitud, ancho y grosor. Las características no métricas como...
Tipo: Journal article
Palavras-chave: Esternón; Osteometría; Mapuche; Rasgos métricos; Rasgos no métricos; Características morfológicas.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100055

Características Morfológicas y Biométricas del Músculo Papilar Septal en Corazones de Individuos Chilenos
Provedor de dados: 77
Autores: Soto Peralta,Aglae; Henríquez Pino,Jorge.
Se realizó un estudio descriptivo de las características anatómicas y biométricas del músculo papilar septal en 30 corazones de individuos adultos chilenos, en edades comprendidas entre 18 y 84 años de edad, de ambos sexos, sin aparente patología cardíaca, pertenecientes a la Unidad de Anatomía Humana Normal del Departamento de Ciencias Básicas de la Universidad de La Frontera. Los resultados mostraron que el músculo papilar septal, se presenta en un 83,3% de los corazones del estudio. De éstos, el 44,0% presenta un solo músculo, el 28% presenta dos músculos y el 28% tres músculos papilares septales. De los músculos papilares septales encontrados, el 71,1% correspondió a la forma cono libre, el 24,4% a la forma cono pegado y el 4,5% a la forma puente. En...
Tipo: Journal article
Palavras-chave: Anatomía; Corazón; Ventrículo derecho; Músculo papilar septal.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300008

Características Morfológicas y Maduración en Mujeres Kayakistas Jóvenes de Aguas Tranquilas y Slalom
Provedor de dados: 77
Autores: Alacid,Fernando; Muyor,José María; Vaquero,Raquel; López-Miñarro,Pedro Ángel.
El objetivo de este trabajo fue describir y comparar las características antropométricas, maduración, somatotipo y proporcionalidad de mujeres kayakistas de aguas tranquilas y slalom. Cincuenta palistas de 13 a 14 años de edad (26 de aguas tranquilas y 24 de slalom), fueron valoradas usando una batería de 29 medidas antropométricas. Se calculó el porcentaje de grasa, el somatotipo, los valores Z utilizando la estrategia Phantom de proporcionalidad y la maduración expresada como los años hasta/desde la edad de máxima velocidad de crecimiento en altura. Las palistas de aguas tranquilas se caracterizaron por una mayor talla y talla sentado que las de slalom, lo que podría interpretarse como un mayor desarrollo madurativo de las primeras. Los valores de...
Tipo: Journal article
Palavras-chave: Antropometría; Somatotipo; Proporcionalidad; Piragüismo/canotaje.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300022

Características Morfológicas y Morfométricas de la Placenta de Término, en Recién Nacidos Pequeños para la Edad Gestacional (PEG) en la Ciudad de Temuco-Chile
Provedor de dados: 77
Autores: Prieto Gómez,Ruth; Matamala,Fernando; Rojas,Mariana.
El metabolismo placentario, el intercambio de sustancias y la producción de hormonas son funciones vitales de la placenta para mantener y promover el desarrollo normal del feto. Existen factores de riesgo que alteran este patrón en el caso del retardo del crecimiento intrauterino, cuyo resultado será un recién nacido (RN) pequeño para la edad gestacional (PEG) que presentará una mayor morbilidad, crecimiento físico e intelectual comprometido y una mayor probabilidad de desarrollar durante la vida adulta diferentes patologías. Los objetivos del presente trabajo son: 1. Reconocer las diferencias en los parámetros morfométricos, como el área de las vellosidades, el área de los vasos, el número de vasos y el área del sinciciotrofoblasto de las placentas de PEG...
Tipo: Journal article
Palavras-chave: Placenta; Recién nacido; Pequeño para la edad gestacional.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300017

Características Morfológicas y Perfil Antropométrico en Mujeres que Practican Pilates Clásico y Mat Clásico
Provedor de dados: 77
Autores: Vaquero-Cristóbal,Raquel; Alacid,Fernando; Esparza-Ros,Francisco; Muyor,José María; López-Miñarro,Pedro Ángel.
El objetivo de este trabajo fue describir y comparar las características antropométricas, somatotipo y proporcionalidad en mujeres que practicaban mat clásico y Pilates clásico. Setenta y nueve mujeres, 39 que realizaban Pilates clásico (edad: 45,10±8,32 años; años de práctica: 1,84±0,73 años) y 40 de mat clásico (edad: 42,60±7,83 años; años de práctica: 1,65±0,96 años), fueron valoradas usando una batería de 41 medidas antropométricas. Se calculó el somatotipo, los valores Z utilizando la estrategia Phamton de proporcionalidad y la composición corporal siguiendo la estrategia de cinco componentes de Kerr. Ambos grupos de mujeres obtuvieron valores similares en la mayoría de las variables antropométricas, valores Z de proporcionalidad, porcentajes de...
Tipo: Journal article
Palavras-chave: Antropometría; Ejercicio físico; Pilates.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200052

Características Neuroanatómicas del Síndrome de Asperger
Provedor de dados: 77
Autores: Vásquez,Bélgica; del Sol,Mariano.
El síndrome de Asperger (SA) es un trastorno del neurodesarrollo que se caracteriza por presentar deterioros cualitativos de las interacciones sociales recíprocas y de los modos de comunicación, como también por la restricción del repertorio de intereses y de actividades que se aprecian estereotipadas y repetitivas. En la actualidad, el Manual Diagnóstico y Estadístico de Trastornos Mentales (DSM-V) decide eliminar esta subcategoría e incorporarla en una categoría general conocida como trastorno del espectro autista (TEA), lo que ha producido muchos debates y desacuerdos principalmente por distingirlo o no, con el autismo del alto funcionamiento (AAF). Un enfoque para resolver esta cuestión corresponde a los esfuerzos que se realizan por comprender la...
Tipo: Journal article
Palavras-chave: Síndrome de Aspeger; Características neuroanatómicas.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100060

Características Planimétricas y Estereológicas de los Nervios Palmar Lateral y Medial en Manos de Equinos con y sin Síndrome Navicular
Provedor de dados: 77
Autores: Salinas,Paulo; Rivas,Francisco; Figueroa,Saúl; Bañados,Rodrigo; Sandoval,Carlos.
El Síndrome Navicular (SN) es una de las patologías claudicógenas mas frecuentes en la práctica clínica equina. Se ha descrito, cierta susceptibilidad individual respecto a ésta presentación clínica, es decir, algunos equinos con SN claudican y otros, con similares hallazgos radiográficos en mano no lo hacen sugiriendo que existen diferencias cuantitativas, entre equinos con y sin SN, en las características de las fibras nerviosas de los nervios periféricos que inervan la mano. El objetivo del estudio fue describir las características morfológicas cuantitativas de los nervios palmar lateral y medial en equinos con SN. Se obtuvo manos mediante un muestreo dirigido y diagnosticadas por inspección visual y evaluación radiográfica. Se conformó dos grupos: "No...
Tipo: Journal article
Palavras-chave: Equino; Síndrome navicular; Estereología; Planimetría; Morfología; Nervio palmar lateral; Nervio palmar medial.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400041

CARACTERIZAÇÃO DA FERTILIDADE DOS SOLOS DE QUATRO LEGUMINOSAS DE CAMPOS RUPESTRES, SERRA DO CIPÓ, MG, BRASIL
Provedor de dados: 127
Autores: Negreiros,Daniel; Borges Moraes,Mateus Lana; Wilson Fernandes,Geraldo.
O presente trabalho teve como objetivo caracterizar a qualidade nutricional dos solos de populações naturais de quatro especies de leguminosas de campo rupestre: Calliandra fasciculata Benth., Chamaecrista ramosa (Vog.), Collaea cipoensis Fortunato e Mimosa foliolosa Benth. Urna amostra composta de solo na profundidade de 0 a 15cm foi coletada em quatro subpopulações de cada especie. Cada amostra composta resultou da coleta de 20 amostras simples (quatro amostras em cinco individuos adultos) por subpopulação. Foram feitas análises de rotina (pH, P, K, Ca21, Mg21, Al31, H+Al), materia orgânica, micronutrientes e granulométrica. Os solos apresentaram acidez elevada, baixa fertilidade, alta saturação de aluminio e textura predominantemente arenosa....
Tipo: Journal article
Palavras-chave: Campos rupestres; Especies endémicas; Fertilidade do solo; Leguminosas arbustivas.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000300003

Caracterización cromosómica de Rhodolirium laetum (Phil.) Ravenna (Amaryllidaceae) a través de cariotipificación e hibridación in-situ de ADN ribosómico
Provedor de dados: 73
Autores: Baeza,Carlos M.; García,Nicolás; Herrera,Fernanda; Ruiz,Eduardo; Rosas,Marcelo.
ABSTRACT Rhodolirium laetum (Phil.) Ravenna has a karyotype 2n = 2x = 16 and the haploid formula 4m + 2sm + 2st. One pair of rDNA 45S signals and two pairs of rDNA 5S were detected through fluorescent in-situ hybridization. The results are discussed in the context of Traubiinae.
Tipo: Journal article
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100240

Caracterización de Estadios del Desarrollo Embrio-Fetal, Vesícula Coriónica y de Placenta en la Gata Doméstica (Felis catus) Mediante Método Ecográfico
Provedor de dados: 77
Autores: Illanes,Gabriela; Espinoza,Claudia; Escárate,Patricia.
La ecografía es uno de los métodos de diagnóstico gestacional más utilizados, que permite confirmar una gestación temprana y realizar seguimientos del desarrollo embrio-fetal. En este estudio se emplearon 10 gatas gestantes, entre 10 meses a 6 años de edad, con fecha de cruza conocida. Se realizaron exámenes ecográficos seriados en los días 15 (estadio 1), 18 (estadio 2), 21 (estadio 3), 38 (estadio 4), y 45 (estadio 5) de gestación para medir parámetros biométricos. Vesícula coriónica: diámetro transversal (DTVC), diámetro longitudinal (DLVC); Placenta: grosor (GP); Feto: longitud céfalo-caudal (LCC), diámetro toraco-abdominal (DTA), diámetro cefálico (DC), tomándose un registro fotográfico de cada estadio. En el estadio 1, no se logró visualizar el...
Tipo: Journal article
Palavras-chave: Gata; Felis catus; Ecografía; Desarrollo Gestacional.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100029

Caracterización de Estructuras Anatómicas Mediante Radiografías Panorámicas: El Foramen Mental
Provedor de dados: 77
Autores: Fuentes,Ramón; Cantin,Mario; Navarro,Pablo; Borie,Eduardo; Beltran,Victor; Bucchi,Cristina.
El foramen mental (FM) es un referente anatómico importante durante procedimientos quirúrgicos y colocación de implantes. Con el propósito de conocer la detectabilidad y posición del FM, caracterizándolo respecto a sus relaciones anatómicas, fueron analizadas 215 radiografías panorámicas convencionales. Además, se determinó la presencia y extensión del bucle del canal mandibular. El FM se detectó en el 87,9% de los casos, en mayor porcentaje en hombres y a menor edad. La posición anteroposterior más frecuente del FM fue en relación al eje longitudinal del segundo premolar en el lado derecho y en el izquierdo entre los ejes longitudinales del primer y segundo premolar. La posición supero-inferior más frecuentemente observada en ambos sexos y todos los...
Tipo: Journal article
Palavras-chave: Foramen mental; Canal mandibular; Bucle anterior del canal mandibular; Nervio alveolar inferior; Radiografía panorámica.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400047

CARACTERIZACIÓN DE GERMOPLASMA DE ARROZ PARA TOLERANCIA A FRÍO EN LA ETAPA DE GERMINACIÓN
Provedor de dados: 113
Autores: Dalma,Castillo; Alvarado A.,J. Roberto.
Debido a que la temperatura es una limitante en todos los estados de desarrollo en la producción arrocera nacional, se caracterizó parte del germoplasma de arroz (Oryza sativa L.) para tolerancia a frío, en dos estados secundarios de germinación, que según la escala de Zadoks corresponden a Z00 y Z07. El estudio se realizó en los laboratorios del Centro Regional de Investigación Quilamapu del Instituto de Investigaciones Agropecuarias (INIA), Chillán, Chile. En el estado Z00, se evaluó el porcentaje de plantas normales en 162 cultivares y líneas avanzadas, divididos en 9 experimentos en un diseño completamente al azar con tres repeticiones, que fueron expuestos a 13ºC durante 35 días. En el estado Z07 se evaluó el porcentaje de plantas vivas de 187...
Tipo: Journal article
Palavras-chave: Tolerancia a frío; Genética.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000400011

Caracterización de la flora vascular de Altos de Chicauma, Chile (33º S)
Provedor de dados: 73
Autores: García,Nicolás.
Se reporta una riqueza total de 602 taxones específcos e infraespecífcos para la localidad de Altos de Chicauma, ubicada en la cordillera de la Costa de la Región Metropolitana de Santiago, Chile (33º S), entre 500 y 2.200 m de altitud. Los taxones endémicos de Chile constituyen 41% y los endémicos del Cono Sur de Sudamérica equivalen a 66% de la flora total, mientras que un 14% corresponde a flora alóctona. La flora total es caracterizada respecto a su presencia en siete tipos de hábitats. Se presenta una lista sistemática comentada donde cada taxón es caracterizado respecto a su hábito de crecimiento, origen geográfco, frecuencia relativa, presencia por tipo de hábitat en Chicauma, y para 572 taxones (95%) se indica material de referencia que respalda su...
Tipo: Journal article
Palavras-chave: Chile central; Cordillera de la Costa; Riqueza; Composición; Endemismo.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100007

Caracterización de la situación posincendio en el área afectada por el incendio de 2005 en el Parque Nacional de Torres del Paine (Chile) a partir de imágenes multiespectrales
Provedor de dados: 97
Autores: NAVARRO CERRILLO,RAFAEL M; HAYAS,ANTONIO; GARCÍA-FERRER,ALFONSO; HERNÁNDEZ CLEMENTE,ROCÍO; DUHALDE,PAMELA; GONZÁLEZ,LUIS.
El uso de sensores remotos para la evaluación de la severidad es una de los aspectos más importantes en el estudio de grandes incendios, así como la aplicación de los resultados para el proceso de restauración. En este trabajo se ha estudiado la aplicación de imágenes de los sensores Landsat ETM+ y ASTER para evaluar la vegetación previa, la superficie recorrida por el fuego y los daños producidos por el incendio ocurrido en el año 2005 en el Parque Nacional de Torres del Paine (Chile). Los resultados obtenidos indican que el índice delta NBR es bastante versátil para evaluar la superficie afectada, estimada en este caso en 17.138 ha, así como la severidad de los daños (Fiabilidad = 81,5 %; k = 0,73). Por otro lado, se ha confirmado la adecuación del uso...
Tipo: Journal article
Palavras-chave: Incendios forestales; Vegetación patagónica; Severidad; Normalized Burn Ratio; Forest fires; Patagonian vegetation; Severity; Normalized Burn Ratio.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000100008

Caracterizacion de las Ramas del Arco Aórtico en una Muestra de Poblacion Colombiana: Un Estudio con Material de Autopsia
Provedor de dados: 77
Autores: Herrera Ortiz,Néstor Eduardo; Ballesteros Acuña,Luis Ernesto; Forero Porras,Pedro Luis.
La variabilidad del arco aórtico y sus ramas emergentes presentan implicaciones en los abordajes quirúrgicos de tórax y cuello, y posiblemente en el desarrollo de procesos ateromatosos ubicados a ese nivel y accidentes cerebrovasculares. Se evaluaron 122 arcos aórticos de individuos adultos de ambos sexos obtenidos como material de autopsia. Se identificó la configuración general de la emergencia de las ramas colaterales de los arcos y se determinó la morfometría de sus componentes con medición electrónica. Se observó la presencia de la configuración usual (tipo A) en 87 arcos (71,3%); un tronco braqui-bicarotideo (tipo B) en 21 piezas anatómicas (17,2%) y en 10 casos (8,2%) la arteria vertebral izquierda se originó directamente del arco aórtico (tipo C);...
Tipo: Journal article
Palavras-chave: Arco aórtico; Tronco braquiocefálico; Arteria carótida; Arteria subclavia; Arteria vertebral.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100008

Caracterización de los Componentes Óseos de la Articulación Temporomandibular: Una Revisión de la Literatura
Provedor de dados: 77
Autores: Fuentes,R; Cantín,M; Ottone,N. E; Bucchi,C.
La articulación temporomandibular (ATM) es una articulación sinovial bilateral de tipo ginglimo-artroidal que anatómicamente está conformada por el cóndilo mandibular, fosa mandibular y tubérculo articular. Es necesario tener un acabado conocimiento de la anatomía de la ATM para una correcta comprensión de su funcionamiento. La descripción anatómica de las estructuras óseas presente en la literatura científica, y que componen la ATM, no es del todo exacta, con diversas diferencias sobre la delimitación del cóndilo mandibular, las fisuras presentes en la fosa mandibular y las superficies articulares de la fosa mandibular y tubérculo articular, así como una amplia variabilidad de términos para referirse a cada estructura anatómica. Se realizó una revisión...
Tipo: Journal article
Palavras-chave: Articulación temporomandibular; Cóndilo mandíbular; Tubérculo articular; Fosa mandibular; Terminologia Anatomica Internacional.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400062

CARACTERIZACIÓN DE LOS COMPONENTES VEGETALES CONSUMIDOS POR OVINOS Y BOVINOS EN PLANTAS DE TAGASASTE (Chamaecytisus proliferus ssp. palmensis)
Provedor de dados: 113
Autores: Avendaño R.,Julia; Carlos,Ovalle M.; Ramírez S.,Marcela.
Se realizó un estudio con el objetivo de caracterizar comparativamente el de material consumido por ovinos y bovinos, en dos tipos de árboles de tagasaste (Chamaecytisus proliferus ssp. palmensis): altos (1,63 m) y bajos (1,09 m). Los componentes del arbusto evaluados fueron brotes y ramas. Los arbustos altos eran más vigorosos, con mayor cantidad de ramas y brotes (2.981 y 3.023 unidades, respectivamente) que los bajos (836 y 976 unidades, respectivamente). La cantidad y el largo de las ramas totalmente consumidas fueron similares (1.250 vs. 1.386 unidades y 6,8 vs. 6,3 cm) para ovinos y bovinos, en cambio, la cantidad y el largo consumido fue menor en los árboles bajos que en los altos (604 vs. 2.032 unidades y 5,9 vs. 7,2 cm, respectivamente). El...
Tipo: Journal article
Palavras-chave: Tagasaste; Consumo; Componentes árboles o arbustos.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000100006

CARACTERIZACIÓN DE SISTEMAS PRODUCTIVOS LECHEROS EN LA X REGIÓN DE CHILE MEDIANTE ANÁLISIS MULTIVARIABLE
Provedor de dados: 113
Autores: Smith R.,Ricardo; Moreira L.,Víctor; Latrille L.,Luis.
Este estudio caracteriza y clasifica las explotaciones lecheras de la Décima Región de Chile de acuerdo a aspectos técnicos, productivos, y relacionados al capital humano con que ellas cuentan. Doscientos noventa predios lecheros fueron encuestados y caracterizados mediante diez variables cuantitativas y nueve cualitativas. Esta información fue analizada mediante tres técnicas de estadísticas multivariable exploratoria (análisis de componentes principales, de correspondencias múltiples, y de conglomerados) para generar cuatro sistemas productivos. El primer sistema productivo obtenido del análisis incluye predios con un bajo nivel tecnológico, partos concentrados en primavera, sin estabulación o confinamiento, carga animal de 0,62 UA ha-1, y una producción...
Tipo: Journal article
Palavras-chave: Predio lechero; Sistemas productivos lecheros; Estadística multivariable; Análisis de correspondencias múltiples; Análisis de conglomerados.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000300004

Caracterización de suelos bajo bosques de Nothofagus betuloides (Mirb) Blume, en Tierra del Fuego, Chile
Provedor de dados: 97
Autores: GERDING,VÍCTOR; THIERS,OSCAR.
En tres sectores de la parte occidental de Tierra del Fuego (54º45'-54º15' S, 68º40'-70º10' O) se caracterizó morfológica, física y químicamente los suelos bajo bosques de coigüe de Magallanes (Nothofagus betuloides (Mirb) Blume) y sus especies asociadas lenga (Nothofagus pumilio (P. et E.) Krasser) y canelo (Drimys winteri Forst.). Se describieron 85 perfiles de suelo y aproximadamente 250 observaciones con bastón pedológico. Los suelos bajo coigüe de Magallanes eran jóvenes, muy influidos por la actividad volcánica, topografía y clima. Se observó la presencia de los órdenes Spodosol e Iceptisol, principalmente. En general los suelos eran delgados a muy delgados (mayoritariamente entre 10 y 40 cm), con un alto volumen de esqueleto, textura franca,...
Tipo: Journal article
Palavras-chave: Fertilidad de suelos; Tierra del Fuego; Tierra del Fuego.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400015

Caracterización del Ciclo de Desarrollo Embrionario y Larval de Sarda chiliensis chiliensis (Alva, 1987) en un Sistema Acuícola de Recirculación (SAR)
Provedor de dados: 77
Autores: Miranda,L; Vilaxa,A; Ávila,R; Rodríguez,M.
Los sistemas acuícolas de recirculación (SAR) son utilizados cada vez más en la acuicultura, especialmente en el norte de Chile en donde las condiciones ambientales son propicias para el cultivo de especies nativas como el bonito (Sarda chiliensis chiliensis), del cual se desconoce su desarrollo embrionario y larval, lo que complica evaluar la factibilidad técnica y económica de desarrollar su cultivo en SAR. Por ello se determinó las bases para su cultivo a partir de enero de 2013, durante 45 días. Los periodos embrionarios caracterizados fueron 31 en 71,83 horas, definidos en 5 estadios: Mórula, Blástula, Gástrula, Neurulación y Metamería. Del desarrollo larval se observaron 35 periodos en 519 horas, un estadio prejuvenil observado a las 591 horas y uno...
Tipo: Journal article
Palavras-chave: Desarrollo embrionario; Sarda chiliensis chiliensis.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400058

Caracterización del Crecimiento en el Primer Año de Cultivares de Espárrago (Asparagus officinalis L.) en Maceta
Provedor de dados: 113
Autores: Pertierra,Rosa; Campos,Jorge; Carrasco,Francisco.
Para evaluar el crecimiento de cuatro cultivares de espárrago (Asparagus officinalis L.) durante el primer año desde siembra se estableció un ensayo en la Provincia de Ñuble (36°34’ lat. Sur, 72°06’ long. Oeste, 144 m.s.n.m). Los cultivares evaluados fueron: Atlas, UC157F1, JWC1 y UC157F2. Se observó una alta correlación positiva entre la acumulación de biomasa y el tiempo (días desde siembra) y también con la temperatura. El modelo lineal biomasa vs. tiempo obtuvo una alta correlación (r = 0,96), por lo que no sería necesario contar con datos climáticos para estimar el crecimiento del espárrago en esta etapa. La inclusión de la radiación fotosintéticamente activa al modelo termal lineal no contribuyó a mejorarlo. Los modelos lineales y por ende las tasas...
Tipo: Journal article
Palavras-chave: Tasa de crecimiento relativo; Grados-día; Radiación solar; Biomasa; Sólidos; Solubles.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000100011

CARACTERIZACIÓN DEL CRECIMIENTO Y LA PRODUCCIÓN DE CEREALES FORRAJEROS INVERNALES EN CÓRDOBA, ARGENTINA
Provedor de dados: 113
Autores: Pagliaricci,H.R; González,S; Ohanian,A.E; Pereyra,T.W.
Se condujo un experimento con el objeto de caracterizar el crecimiento y la producción de las especies y variedades de forrajes de invierno más difundidas en la región. Las especies utilizadas fueron: centeno (Secale cereale L.) cvs. "Manfredi Suquía INTA" y "Naicó INTA" ; avena (Avena sativa L.) cvs. "Buck Tambera" y "Millauquén INTA" y triticale (X Triticosecale Wittmack) cvs. "Tehuelche INTA", "Quiñé UNRC", "Genú UNRC" y "Tizné UNRC". La evaluación se efectuó durante cuatro años (1993 - 1996) con siembras efectuadas durante la primera quincena del mes de marzo y densidades que oscilaron entre 150 a 180 plantas m-2.Las mediciones se realizaron mediante muestreos mensuales dejando un remanente de 7 a 10 cm. La disposición del ensayo permitió medir el...
Tipo: Journal article
Palavras-chave: Cereales forrajeros de invierno; Curvas de crecimiento; Producción.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000300003

Caracterización del hábitat de peces nativos en el río San Pedro (cuenca del rio Valdivia, Chile)
Provedor de dados: 72
Autores: García,Alex; González,Jorge; Habit,Evelyn.
En sistemas fluviales, las comunidades biológicas están estructuradas principalmente por el hábitat físico. Conocer el tipo de hábitat que ocupa cada especie a lo largo de su vida es fundamental para comprender su ecología en sistemas naturales y definir estrategias de conservación en sistemas alterados. Por ello, aquí caracterizamos el uso de hábitat de 12 especies de peces nativos del río San Pedro. Se capturaron 37334 individuos de las 13 especies nativas presentes en el río. Los hábitats más muestreados y con mayores capturas totales fueron pozas someras y rápidos someros. Las especies más abundantes fueron Percilia gillissi, Galaxias maculatus, Galaxias platei y Trichomycterus areolatus. Se observa un uso diferenciado del hábitat por especie, en que...
Tipo: Journal article
Palavras-chave: Hábitat; Peces nativos; Río San Pedro; Chile.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100004

Caracterización del Holoparasitismo de Orobanche ramosa en Tomate Bajo Condiciones de Campo
Provedor de dados: 113
Autores: Díaz S,Jorge; Norambuena M,Hernán; López-Granados,Francisca.
Se realizaron estudios de campo entre 1999 y 2002, en Angol, Chile (37º45’ lat. Sur, 72º44’ long. Oeste) para determinar la fenología del complejo orobanque-tomate (Orobanche ramosa L.-Lycopersicon esculentum Mill.), caracterizar la influencia del holoparasitismo en el crecimiento y desarrollo del hospedero, y la respuesta productiva en tres épocas de plantación (temprana, normal y tardía). La fenología de O. ramosa comprende una fase subterránea y otra aérea, definiéndose un total de seis estados de desarrollo: “a”: nódulo; “b”: nódulo con raíz de escaso desarrollo; “c”: aparición de yema; “d”: yema y raíz desarrollada; “e”: vástago desarrollado; y “f”: vástago emergiendo sobre la superficie del suelo. La fase subterránea se inició con el establecimiento...
Tipo: Journal article
Palavras-chave: Hospedero; Fenología; Morfología; Días grado; Épocas de plantación.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000300001

Caracterización del limbo de Piper aduncum L. (Piperaceae): Análisis estructurales, histoquímicos y de sus aceites esenciales
Provedor de dados: 73
Autores: DOUSSEAU,SARA; DE SOUZA CHAVES,IZABEL; DE CASTRO,EVARISTO MAURO; ALVES DE ALVARENGA,AMAURI; ALVES,EDUARDO; PEREIRA PINTO,JOSÉ EDUARDO BRASIL; MARQUES DA SILVA JUNIOR,JESSÉ; BASTOS PEREIRA,VANESSA.
Piper aduncum L. (Piperaceae) es una especie arbustiva umbrófila que se encuentra generalmente en suelos con elevado contenido de materia orgánica y humedad. De las hojas se extrae aceite esencial con acción insecticida, fungicida y bactericida, con una amplia utilización en el sector agrario y medicinal. El objetivo del trabajo fue caracterizar el limbo de P. aduncum. Se efectuó la caracterización anatómica e histoquímica de la sección transversal y la caracterización anatómica de la sección paradérmica apical, mediana y basal del limbo. Para ello las hojas fueron preparadas con las técnicas tradicionales de microscopía de luz y microscopía electrónica. El mesófilo es dorsiventral con capas subcelulares en ambas epidermis. En la epidermis y las capas...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100015

CARACTERIZACION ECOLOGICA DE HUMEDALES DE LA ZONA SEMIARIDA EN CHILE CENTRAL
Provedor de dados: 72
Autores: Figueroa,Ricardo; Suarez,María Luisa; Andreu,Asunción; Ruiz,Víctor H; Vidal -Abarca,María R.
Uno de los ecosistemas naturales más amenazados del planeta son los humedales, que a pesar de su reconocida importancia, son poco valorados, lo que cobra mayor relevancia en Chile donde existen muy poca información sobre este tipo de ambientes. Este trabajo reúne antecedentes sobre tipología, hidrología, usos del suelo, unidades paisajísticas e impactos de 20 humedales de las regiones IV y V (Coquimbo y Valparaíso, Chile Central). El período de muestreo abarcó del 2 al 10 de julio de 2007 correspondiente a la fase húmeda del ciclo hidrológico anual. Se analizaron distintos parámetros físico-químicos: profundidad, ancho de lámina de agua, tipología del sustrato, temperatura del agua, pH y conductividad; y biológicos: vegetación acuática y de ribera,...
Tipo: Journal article
Palavras-chave: Chile Central; ECELS; Humedales; Macroinvertebrados; Peces.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100011

Caracterización en pre y poscosecha de dos cultivares de melón reticulado del tipo Oriental (Cucumis melo Grupo Cantalupensis)
Provedor de dados: 118
Autores: Laínez,Dominique; Krarup,Christian.
Este estudio tuvo por objetivo caracterizar el comportamiento en pre y poscosecha de dos cultivares de melón reticulado tipo Oriental (Cucumis meló Grupo Cantalupensis), Emerald y Glamour, producidos bajo prácticas de cultivo habituales en Chile. Ambos cultivares presentaron un desarrollo vigoroso, sin problemas sanitarios y una alta producción de frutos. Los frutos del cv. Emerald desarrollaron una zona de abscisión peduncular y se separaron de la planta al madurar, presentaron tamaño medio (1,0 kg), forma ovalada, epidermis verde con reticulado fino y poco denso, y pulpa verde cremosa de con 10,3% como promedio de sólidos solubles totales (SST). En contraste, los frutos del cv. Glamour no desarrollaron una zona de abscisión peduncular y no se separaron...
Tipo: Journal article
Palavras-chave: Cucumis meló; Manejo de poscosecha; Tecnología de la fruta.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000100006

CARACTERIZACION ESPACIO-TEMPORAL DEL NICHO TROFICO DE LA FAUNA ICTICA ANDINA DEL RÍO MAULE, CHILE
Provedor de dados: 72
Autores: Acuña,Patricio; Vila,Irma; Pardo,Rodrigo; Comte,Sheila.
Los sistemas fluviales de la zona central de Chile presentan variaciones estacionales en: caudal, temperatura y conductividad. Esto ha influenciado a la fauna íctica nativa la que ha sido caracterizada como primitiva, representada por un bajo número de géneros y especies. La coexistencia de especies nativas e introducidas en el río Maule, Chile (35°43°S;71°05°W), se remonta a comienzos del siglo XX, sistema en el cual las interacciones ecológicas entre estas especies no han sido suficientemente evaluadas. Para ello, se seleccionaron cuatro estaciones de trabajo en el sector andino del río Maule y sus tributarios, en dos periodos del año 1988. La fauna íctica se obtuvo realizando censo total, con un equipo de pesca eléctrica, analizándose el contenido...
Tipo: Journal article
Palavras-chave: Competencia interespecífica; Fauna íctica introducida; Sobreposición de nicho; Río Maule.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100022

Caracterización Estereológica de Odontoblastos en Pulpas Dentarias Humanas Sanas y con Pulpitis Reversible
Provedor de dados: 77
Autores: Morales,Rolando; Trujillo,Erick; Cantín,Mario.
La reacción y reparación dentinaria depende del número de odontoblastos. Los métodos para obtener estimaciones fiables sobre la cantidad de odontoblastos en la pulpa dental han sido subjetivos y sesgados, sobre todo al evaluar los cambios cuantitativos y la potencial capacidad reparativa en presencia de caries. El objetivo de este trabajo fue estimar y comparar cuantitativamente el número, densidad y volumen de odontoblastos en dientes sanos y con diagnóstico de pulpitis reversible producto de caries a través de herramientas estereológicas. Se utilizaron dientes premolares humanos obtenidos de exodoncias, divididos en un grupo sano y otro cariado. Fueron fijados y descalcificados con ácido nítrico al 5%. Siguiendo el protocolo del orientator se obtuvieron...
Tipo: Journal article
Palavras-chave: Odontoblasto; Diente humano; Estereología; Pulpa dentaria.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100027

CARACTERIZACIÓN FENOTÍPICA DE SEGREGANTES IDENTIFICADOS CON MARCADORES DE MICROSATÉLITES, CON ÉNFASIS EN APIRENIA Y RESPUESTA A ÁCIDO GIBERÉLICO EN CRECIMIENTO DE BAYAS DE UVA
Provedor de dados: 113
Autores: Barticevic R.,Margarita; Zavala M.,Kattina; De Felice,Simona; Valenzuela B.,Jorge; Muñoz Sch.,Carlos; Hinrichsen R.,Patricio.
En este artículo se reporta la caracterización de algunos cruzamientos de uva de mesa (Vitis vinifera L.) para los caracteres desarrollo de semilla, tamaño de bayas y respuesta al tratamiento con ácido giberélico (GA3) para crecimiento de baya. Para ello, se han usado segregantes de identidad conocida por cuanto se ha verificado su filiación en base a un conjunto de cinco marcadores de microsatélites heterocigotos en los progenitores, con los que se detectó entre 18 y 21% de autofertilización del cultivar madre, además de cerca de 3% de plantas que no coinciden genéticamente con ninguno de los progenitores. Los cruzamientos estudiados fueron Ruby Seedless x Sultanina, Ruby Seedless x Perlette y sus respectivos recíprocos (76 y 56 segregantes en producción,...
Tipo: Journal article
Palavras-chave: Vitis vinifera L.; Mejoramiento genético de uva de mesa; Filiación; Microsatélites; Apirenia; Ácido giberélico; Tamaño de bayas.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000100001

CARACTERIZACIÓN FÍSICA-QUÍMICA Y BIOLÓGICA DE ENMIENDAS ORGÁNICAS APLICADAS EN LA PRODUCCIÓN DE CULTIVOS EN REPÚBLICA DOMINICANA
Provedor de dados: 127
Autores: Pérez,Aridio; Céspedes,Carlos; Núñez,Pedro.
Los beneficios de la aplicación de enmiendas orgánicas en la agricultura son conocidos a nivel mundial; sin embargo, existen muy pocos estudios sobre los contenidos nutricionales y actividad biológica de estos fertilizantes orgánicos. En República Dominicana estas enmiendas son aplicadas en la agricultura hace más de dos décadas; pero no han sido estudiadas. El objetivo de la investigación fue determinar las características física-químicas y microbiológicas de las enmiendas orgánicas de mayor uso en República Dominicana, así como las fuentes utilizadas para su preparación. Las muestras de enmiendas orgánicas fueron recolectadas en las localidades de Jarabacoa, Espaillat, La Vega y Montecristi durante el periodo enero del 2005 a julio 2006. En total se...
Tipo: Journal article
Palavras-chave: Propiedades físicas; Químicas; Biológicas; Suelo; Enmiendas orgánicas; Compost.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000300002

Caracterización fisiológica del enraizamiento in vitro de Eucalyptus nitens y Eucalyptus globulus
Provedor de dados: 73
Autores: Jofré,María Paz; Ríos,Darcy; Becerra,José; Sánchez-Olate,Manuel.
RESUMEN El entendimiento de los cambios bioquímicos que ocurren durante las distintas fases del enraizamiento hace posible obtener mayor porcentaje de enraizamiento de microbrotes en especies leñosas. Para diferenciar ambas especies y encontrar un marcador de la capacidad rizogénica, en el presente estudio se pretende caracterizar perfiles cinéticos de Ácido Indol Acético (AIA), Fenoles totales y Carbohidratos totales. Para esto se evaluaron microtallos de las especies Eucalyptus nitens (H. Deane &amp; Maiden) Maiden y Eucalyptus globulus Labill. las cuales fueron tratadas con el método de la inducción lenta del enraizamiento en medio de cultivo Murashige &amp; Skoog (1962) (MS) con las sales a la mitad, 30 g/L de sacarosa, suplementado con Ácido Naftalen...
Tipo: Journal article
Palavras-chave: Flavonoides; Acido Indol Acético; Enraizamiento adventicio.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200421

Caracterización florística e hidrológica de turberas de la Isla Grande de Chiloé, Chile
Provedor de dados: 97
Autores: DÍAZ,MARÍA F; LARRAÍN,JUAN; ZEGERS,GABRIELA; TAPIA,CAROLINA.
Las turberas son ecosistemas reconocidos mundialmente por actuar como grandes reservorios de agua dulce, afectando el clima y la hidrología local; por ser sumideros de carbono; por albergar especies únicas, contribuyendo así a la biodiversidad; y porque significan un recurso económico para la sociedad. La vegetación de las turberas es dominada por plantas que crecen a ras de suelo formando densas poblaciones, en especial musgos del género Sphagnum o plantas vasculares de la familia de las Ciperáceas o Juncáceas. Presentan altos niveles freáticos y una profunda capa de materia orgánica (turba) bajo la capa viva de plantas. La tala y quema de bosques en sitios con drenaje pobre han generado un tipo de ecosistema similar a las turberas donde crece...
Tipo: Journal article
Palavras-chave: Sphagnum; Turberas; Turberas antropogénicas; Diversidad; Napa freática.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400002

Caracterización genética del puma andino boliviano (Puma concolor) en el Parque Nacional Sajama (PNS) y relaciones con otras poblaciones de pumas del noroccidente de Sudamérica
Provedor de dados: 97
Autores: RUIZ-GARCÍA,MANUEL; PACHECO,LUIS F; ÁLVAREZ,DIANA.
Se analizaron originalmente 25 muestras fecales de puma andino boliviano para proceder a su extracción de ADN. De esas 25 muestras, se detectaron cinco pumas diferentes que, junto, a tres de pieles de animales cazados, completaron un total de ocho pumas andinos bolivianos analizados. Igualmente se analizaron 45 muestras de ADN procedentes de pumas silvestres de Colombia, Perú, Ecuador, Venezuela y Amazonia occidental brasileña obtenidas a partir de mechones de pelos con bulbo, trocitos de pieles, músculo y dientes. Todas ellas se genotipificaron para siete marcadores microsatélites (Fea 08, 24, 43, 45, 96, 126 y 391). Los niveles de diversidad genética resultaron muy elevados en ambas muestras (H = 0,942 y 0,845; respectivamente), con valores muy...
Tipo: Journal article
Palavras-chave: Puma; Puma concolor; Microsatélites de ADN; Genética de poblaciones; Bolivia.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000100007

Caracterización Histológica y Morfológica del Tracto Digestivo de la Merluza Austral (Merluccius australis)
Provedor de dados: 77
Autores: Serrano,Edison; Leiva,Camila; Lonza,Carlos; Sánchez,Juan Carlos; Wacyk,Jurij; Zegers,Tatiana; Godoy,Marcos.
Las características anatómicas e histológicas del tracto alimentario de la merluza austral (Merluccius australis) se han estudiado con el fin de comprender la fisiología digestiva y formular alimentos balanceados adecuados. M. australis posee un esófago corto, un estómago en forma de y grande y un intestino corto. Histológicamente, el tracto digestivo está formado por cuatro capas: la mucosa, submucosa, muscularis y la serosa. El esófago es un órgano tubular corto de pared gruesa con una gran capacidad de distensión y abundantes células caliciformes secretoras de mucus que permite el paso de grandes presas. El estómago es grande y musculoso, con alta capacidad de distensión. No se observo la presencia de apéndices pilóricos. El intestino es corto y...
Tipo: Journal article
Palavras-chave: Merluccius australis; Merluza austral; Tracto digestivo; Histología; Morfología intestinal.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300054

Caracterización Morfológica del Arco Plantar Longitudinal Medial del Pie en una Población Chilena
Provedor de dados: 77
Autores: Sánchez Ramírez,Celso.
El arco plantar longitudinal medial del pie (APLM) es el componente más importante en estática y dinámica de la bóveda plantar. Su altura define pies normales, planos y cavos, estos últimos son factores predisponentes de lesiones. El objetivo de este estudio fue describir y relacionar en una población de estudiantes universitarios chilenos la prevalencia de pies normales, cavos y planos según índice de masa corporal (IMC), sexo y actividad física (AF) semanal y la distribución de asimetrías entre pies. Se estudió a 209 sujetos (128 hombres y 81 mujeres), estudiantes universitarios, cuya edad, estatura, peso e IMC fue de 20,4 años (±3,4); 1,68 m (±0,09); 67,6 Kg (±12,4) y 23,77 (±3,0) respectivamente. Por medio de cuestionario se determinó los hábitos de AF...
Tipo: Journal article
Palavras-chave: Arco plantar; Pie plano; Pie Cavo; Arch Index.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100015

Caracterización Morfológica del Músculo Bíceps Femoral del Perro
Provedor de dados: 77
Autores: Blanco,C; Acerbo,M; Martín,E; Arzone,C; Sánchez,G; Calaudi,P; Vidal Figueredo,R. J; Pellegrino,F. C.
A partir de estudios previos realizados sobre la anatomía del musculo bíceps femoral en el perro y con el objetivo de avanzar en la caracterización inmunohistoquímica y nerviosa de este musculo, estudiamos la existencia de subvolúmenes musculares. Utilizamos la disección roma en piezas musculares aisladas fijadas y tratadas con ácido nítrico al 25%. Las divisiones de las ramas del nervio isquiático involucradas fueron utilizadas como guía en la disección. Se determinaron tres subvolúmenes, uno involucrando a la cabeza caudal y dos en el vientre correspondiente a la cabeza craneal que fueron denominados caudal, proximal y distal respectivamente. Realizamos mediciones del largo de las fibras musculares, dirección, dirección y densidad macroscópica de las...
Tipo: Journal article
Palavras-chave: Bíceps femoral; Canino; Subdivisión muscular.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400029

Caracterización Morfológica, Génica y Protéica en la Diferenciación de Células Madre Embrionarias de Ratón a Células Pancreáticas Tempranas
Provedor de dados: 77
Autores: Vázquez-Zapién,G. J; Sánchez Monroy,V; Chirino López,Y. I; Mata-Miranda,M. M.
Debido al auge de la medicina regenerativa, las Células Madre (SC) representan una fuente de reemplazo celular para cualquier tejido, decidiendo emprender este trabajo de investigación con el objetivo de diferenciar células madre embrionarias de ratón (mESC) a células pancreáticas tempranas, realizando su caracterización génica y morfológica. Primeramente se cultivaron y arrestaron en su ciclo celular fibroblastos embrionarios de ratón (MEF) con mitomicina, posteriormente se expandieron las mESC y se sometieron a un protocolo de diferenciación de 21 días hacía células pancreáticas tempranas, evaluándose durante la diferenciación su morfología y expresión relativa de los genes sox-17, pdx-1, ins-1 e ins-2, determinando además la producción de las proteínas...
Tipo: Journal article
Palavras-chave: Células madre; Stem cell; Diferenciación de células madre; Células diferenciadas; Cuerpos embrionarios; Células productoras de insulina.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400044

CARACTERIZACION MORFOLOGICA Y CROMOSOMICA DE COMMELINA BENGHALENSIS L. (COMMELINACEAE) DE ARGENTINA
Provedor de dados: 73
Autores: Grabiele,Mauro; Honfi,Ana I; Grabiele,Marina; Debat,Humberto J; Daviña,Julio R.
Commelina benghalensis es una hierba pequeña, nativa de Africa y Asia tropical, aunque en la actualidad crece en casi todo el mundo. En América se la reporta creciendo en campo abierto, borde de bosques y áreas cultivadas (sur de USA, México, Antillas, Guyana Francesa, Brasil, Bolivia, Paraguay) como maleza o invasora y su difícil control causa pérdidas económicas importantes en diversos agroecosistemas de todo el mundo. Commelina benghalensis fue encontrada en un borde de selva misionera (Argentina, Provincia de Misiones, Departamento Guaraní, El Soberbio, 27°17'54,5"S; 54°12' 19"W), y se aplicaron técnicas citogenéticas tradicionales para analizar su sistema genético. Commelina benghalensis es diploide con 2n = 2x = 22 cromosomas de tamaño medio (4,05 -...
Tipo: Journal article
Palavras-chave: Morfología; Sistema genético; Planta invasora; Microsporogénesis; Cariotipo.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100003

Caracterización morfométrica de estructuras florales de Tagetes erecta L. y Tagetes patula L. (Asteraceae) utilizando análisis digital de imágenes y dimensión fractal
Provedor de dados: 73
Autores: QUINTANILLA CARVAJAL,MARIA XIMENA; ARENAS OCAMPO,MARTHA LUCÍA; CAMPOS MENDIOLA,ROBERTO; CAMACHO DÍAZ,BRENDA HILDELIZA; JIMÉNEZ APARICIO,ANTONIO RUPERTO.
Las flores Tagetes erecta L. y Tagetes patula L. tienen usos ornamentales en México, y también algunas industrias las utilizan en la coloración de carne. El género Tagetes presenta especies y variedades con diferentes colores y tonalidades en sus flores. Por lo que, una forma de distinción rápida y objetiva de estas variedades sería útil para la industria. En este trabajo se desarrolló un método para distinguir y caracterizar la diversidad en dos variedades de T. erecta y T. patula a través de la caracterización de las estructuras florales, utilizando técnicas de análisis digital de imágenes y análisis fractal. Para esto, se capturaron imágenes de lígulas y capítulos florales, que posteriormente fueron binarizadas para obtener imágenes de objetos separados...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100016

CARACTERIZACION MORFOMETRICA DE LA GERMINACION DE CHLORAEA CRISPA LINDL. (ORCHIDACEAE) USANDO UN ANALISIS DE IMAGEN
Provedor de dados: 73
Autores: Verdugo,Gabriela; Marchant,Jorge; Cisternas,Mauricio; Calderón,Ximena; Peñaloza,Patricia.
Mediante la técnica de análisis de imagen se evaluó las etapas de germinación de un lote de semillas de Chloraea crispa Lindl. Se pudo observar las cuatro etapas de germinación propuestas por Mitchell. La etapa cero corresponde a semillas sin germinar, éstas son alargadas, curvadas en uno de sus extremos, y alcanzan un largo promedio de 0,5 mm. En la etapa uno se aprecia un incremento sólo en ancho debido al crecimiento del embrión, en la etapa dos hay cambios tanto en la forma como en el aumento del diámetro. En la etapa tres, única visible a simple vista, se inicia la germinación fisiológica. El porcentaje de germinación determinado por esta técnica varió entre 33 y 40 %, resultado coincidente con otros autores
Tipo: Journal article
Palavras-chave: Germinación simbiótica; Imágenes digitales; Orquídeas chilenas.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200008

Caracterización Morfométrica del Reborde Anterior de la Maxila Mediante Tomografía Computarizada Cone-Beam
Provedor de dados: 77
Autores: Fuentes,Ramón; Navarro,Pablo; Salamanca,Carlos; Cantín,Mario; Garay,Ivonne; Flores,Tania.
Las imágenes obtenidas por Tomografía Computarizada Cone-Beam (TCCB) permiten determinar las relaciones de estructuras anatómicas tridimensionalmente y superar limitaciones de la radiografía convencional. El objetivo de este estudio fue describir las características morfométricas de la zona anterior del maxilar y su relación con los dientes canino y premolares mediante exámenes de TCCB. Se realizó un estudio descriptivo sobre 50 imágenes de TCCB siguiendo una sistemática de observación tridimensional se ubicaron puntos anatómicos entre dientes y paredes del seno maxilar, y se trazaron tangentes para su medición. Se calculo la Media y DE para cada parámetro, y la normalidad de la distribución se comprobó mediante la prueba de Kolmogorov-Smirnov. Los datos...
Tipo: Journal article
Palavras-chave: Seno maxilar; Implantes dentales; Diente canino; Primer premolar maxilar.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200020

CARACTERIZACIÓN PRELIMINAR DE UNA COLECCIÓN DE LEGUMINOSAS FORRAJERAS ANUALES PARA LA ZONA MEDITERRANEA DE CHILE
Provedor de dados: 113
Autores: Ovalle M.,Carlos; Bustos B.,Paola; del Pozo L.,Alejandro; Avendaño R.,Julia; Arredondo S.,Susana.
En el Instituto Nacional de Investigaciones Agropecuarias (INIA), Centro Experimental Cauquenes (35º58’lat. Sur; 72º17’long. Oeste), VII Región, se evaluaron variables fenológicas y agronómicas de 35 accesiones de leguminosas forrajeras anuales. Las especies estudiadas fueron Biserrula pelecinus (3 accesiones), Medicago polymorpha (1), Ornithopus compressus (9), Ornithopus sativus (2), Trifolium isthmocarpum (1), Trifolium michelianum (7), Trifolium nigrescens (1), Trifolium pallidum (1), Trifolium resupinatum (4), Trifolium subterraneum (5) y Trifolium vesiculosum (1). Los días desde emergencia a floración fluctuaron entre 103 y 164 días. En Ornithopus spp. hubo una gran variación en precocidad (103 - 143 días) y en productividad (290 - 890 g MS m-2). La...
Tipo: Journal article
Palavras-chave: Leguminosas forrajeras anuales; Secano.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000200005

CARACTERIZACIÓN QUÍMICA Y FÍSICA DE COMPOST DE LOMBRICES ELABORADOS A PARTIR DE RESIDUOS ORGÁNICOS PUROS Y COMBINADOS
Provedor de dados: 113
Autores: Castillo,Alicia E.; Quarín,Silvio H.; Iglesias,María C.
El objetivo de este trabajo fue caracterizar químicamente y físicamente el compost de lombrices, y determinar la proporción de mezcla de substratos más conveniente, evaluando su rendimiento y calidad. El diseño experimental fue de bloques completos al azar con cinco tratamientos y cinco repeticiones, en las siguientes proporciones T1 (100% estiércol (E)); T2 (100% desechos de cocina (DC)); T3 (75% E y 25% DC); T4 (50% E y 50% DC); T5 (25% E y 75% DC). Estas mezclas fueron sometidas a 90 días de composteo y luego a la acción de lombrices (Eisenia foetida Savigny, 1826). De los productos obtenidos se determinaron: nitrógeno potencialmente mineralizable; fósforo disponible, potasio extractable, materia orgánica, pH, rendimiento al tamizado, y la pérdida de...
Tipo: Journal article
Palavras-chave: Compost de lombriz; Estiércol; Residuos de cocina; Nitrógeno; Fósforo; Potasio; Materia orgánica.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000100008

Caracterización trófica de Orestias (Teleostei: Cyprinodontidae) en el Parque Nacional Lauca
Provedor de dados: 72
Autores: GUERRERO,CLAUDIA J; POULIN,ELIE; MÉNDEZ,MARCO A; VILA,IRMA.
Los peces muestran una amplia diversidad de comportamientos alimentarios, algunas veces asociados con morfologías específicas, las cuales pueden reflejar adaptaciones para usar los recursos dependiendo de su hábitat. En los sistemas acuáticos aislados, los peces son un buen modelo de estudio para entender las relaciones tróficas. Este estudió evaluó la dieta de cinco especies de Orestias, las cuales habitan ocho sitios diferentes en la Región de Arica y Parinacota, Parque Nacional Lauca. Se analizaron 177 estómagos pertenecientes a las especies Orestias chungarensis, O. laucaensis, O. parinacotensis, O. piacotensis y Orestias cf agassii. Para los análisis se utilizaron descriptores cuantitativos de número de items presa y frecuencia de ocurrencia. Se...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100004

Caracterización trófica del placóforo intermareal Enoplochiton niger en el norte de Chile: variación ambiental y patrones dietarios a nivel local y region
Provedor de dados: 97
Autores: SANHUEZA,ALVARO G; NAVARRETE,ARTURO H; OPAZO,L. FELIPE; CAMUS,PATRICIO A.
El rol e impacto de los herbívoros en la trama trófica de comunidades intermareales rocosas podría ser más diverso y complejo de lo considerado hasta ahora, particularmente en el caso de consumidores de mayor tamaño y abundancia como el molusco placóforo Enoplochiton niger. Esta especie es uno de los pastoreadores de mayor tamaño (hasta 20 cm) e importancia ecológica en las costas rocosas del norte de Chile, pero también una de las especies menos conocidas en términos tróficos. Este trabajo presenta una evaluación de los patrones dietarios de E. niger en cuatro comunidades del norte de Chile, distribuidas en 1.000 km de costa y muestreadas estacionalmente entre invierno 2004 y otoño 2006. Además se analizó la relación de su dieta con factores biológicos y...
Tipo: Journal article
Palavras-chave: Chitón; Tamaño corporal; Omnivoría; Surgencia; El Niño.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400007

Caracterización y Marcación de Células Germinales Primordiales
Provedor de dados: 77
Autores: Stevenson,A; Obaíd,M; Romina,R; Vigneaux,L.
Las células germinales primordiales (CGP) son los precursores de los ovocitos y espermatocitos. Se caracterizan por ser las únicas capaces de retener verdaderamente la capacidad de desarrollo pluripotencial luego de la gastrulación. Estas células provienen del epiblasto, diferenciándose del resto de las células somáticas gracias a señales emitidas por el ectodermo extraembrionario y endodermo visceral tempranamente a partir de los días 6,0 a 7,5 dpc. en la especie murina. Luego migran a través de intestino primitivo y mesenterio dorsal hasta llegar a las crestas genitales alrededor de los 10,5 dpc. Las células germinales primordiales tienen una variada morfología y expresión génica, por lo tanto presentan distintos marcadores según el estadío en el que se...
Tipo: Journal article
Palavras-chave: Células germinales primordiales; Marcadores; Pluripotencial.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200034

CARACTERIZACIÓN Y ZONIFICACIÓN EDÁFICA Y CLIMÁTICA DE LA REGIÓN DE COQUIMBO, CHILE
Provedor de dados: 127
Autores: Morales S,Luis; Canessa M,Fabricio; Mattar,Cristian; Orrego,Raúl; Matus,Francisco.
Este estudio consistió en la evaluación y clasificación de los recursos climáticos y edáficos en la región de Coquimbo, usando algoritmos topoclimáticos e imágenes de satélite integrados en un ambiente SIG. Se usaron 78 estaciones climáticas con mediciones de precipitación media anual y mensual, temperatura media anual y mensual, humedad relativa y radiación solar. Se utilizó también cartografía de isolineas y un modelo digital de elevaciones escala 1:250.000. Para determinar la distribución espacial de las variables climáticas se probaron regresiones múltiples entre variables topográficas y datos climáticos. Este proceso condujo a la elaboración de matrices con las variables climáticas espacializadas en una escala 1:250.000. Mediante este procedimiento se...
Tipo: Journal article
Palavras-chave: Clasificación edafoclimática; Topoclimatología; Regresión multivariada; Análisis Cluster.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000300005

Carbohydrates Detection in the Hepatic Egg - Granuloma System Using Lectin Histochemistry
Provedor de dados: 77
Autores: Ribeiro Melo-Júnior,Mario; Bezerra Cavalcanti,Carmelita de Lima; Teles de Pontes-Filho,Nicodemos; Carvalho Jr,Luiz Bezerra de; Carneiro Beltrão,Eduardo Isidoro.
This study aims to evalúate the egg-granuloma system in hepatic tissues using lectin histochemistry in experimental Schistosomiasis. Eight Swiss mice were infected with a local strain of Schistosoma mansoni, being submitted forty days later to a perfusión after which slices of liver (4|J.m) were prepared. The tissue samples were incubated with the following peroxidase conjugated lectins: Peanut agglutinin (PNA), Wheat Germ agglutinin (WGA), and Concanavalin A (Con A). All lectins recognized the glycoconjugates in the adult worm tegument. In the hepatic tissue, WGA presented the highest staining followed by PNA and Con A. The PNA presented the most intense staining of the egg-granuloma system while WGA stained the hepatic sinusoid cells and Con A bound...
Tipo: Journal article
Palavras-chave: Lectins; Egg-granuloma system; Liver; Schistosoma mansoni.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400030

Carbonated Water and Necro-Apoptotic Cell Death in Chicken Embrio Low Limb
Provedor de dados: 77
Autores: Álvarez,Marco; Perdomo,Lourdes.
Carbonated water is a fundamental part of many drinks and its effects have been studied in many pathological situations. However, cells and tissue damage as a consequence of carbonated water has not been the subject of extensive research. We assessed the short-term effects of soda on in vitro Hanging-drop culture of myoblasts and ex vivo lower limb of 8-day-old chicken embryo skeletal muscle tissue. Several groupswerendesigned: a) Control (Con-tyr), b) Carbonated water (Car), c) Coffe (Caf), and d) Cola beverage (Glu). The samples were observed with light microscopy and digital imaging analysis was performed. The ultra-structure of control and treated tissue were observed with electron microscopy. Immunohistochemistry techniques, such as terminal...
Tipo: Journal article
Palavras-chave: Soda Club; Chicken embryo; Low limb; Apoptosis; Necrosis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200006

Carbonic anhydrase activity in the red blood cells of sea level and high altitude natives
Provedor de dados: 48
Autores: GAMBOA,JORGE; CACEDA,RICARDO; GAMBOA,ALFREDO; MONGE-C,CARLOS.
Red blood cell carbonic anhydrase (CA) activity has not been studied in high altitude natives. Because CA is an intraerythocytic enzyme and high altitude natives are polycythemic, it is important to know if the activity of CA per red cell volume is different from that of their sea level counterparts. Blood was collected from healthy subjects living in Lima (150m) and from twelve subjects from Cerro de Pasco (4330m), and hematocrit and carbonic anhydrase activity were measured. As expected, the high altitude natives had significantly higher hematocrits than the sea level controls (p=0.0002). No difference in the CA activity per milliliter of red cells was found between the two populations. There was no correlation between the hematocrit and CA activity.
Tipo: Journal article
Palavras-chave: Carbonic anhydrase; Hypoxia; Polycythemia.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000300006

Carbonic Anhydrase and Zinc in Plant Physiology
Provedor de dados: 117
Autores: Escudero-Almanza,Dalila Jacqueline; Ojeda-Barrios,Dámaris Leopoldina; Hernández-Rodríguez,Ofelia Adriana; Sánchez Chávez,Esteban; Ruíz-Anchondo,Teresita; Sida-Arreola,Juan Pedro.
Carbonic anhydrase (CA) (EC: 2.4.1.1) catalyzes the rapid conversion of carbon dioxide plus water into a proton and the bicarbonate ion (HCO3-) that can be found in prokaryotes and higher organisms; it is represented by four different families. Carbonic anhydrase is a metalloenzyme that requires Zn as a cofactor and is involved in diverse biological processes including pH regulation, CO2 transfer, ionic exchange, respiration, CO2 photosynthetic fixation, and stomatal closure. Therefore, the review includes relevant aspects about CA morphology, oligomerization, and structural differences in the active site. On the other hand, we consider the general characteristics of Zn, its geometry, reactions, and physiology. We then consider the CA catalysis mechanism...
Tipo: Journal article
Palavras-chave: Cofactor; Metal ion catalysis; Metalloenzyme; Zinc deficiency; CO2 transfer.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100022

CARBONO DE RESPIRACIÓN DE UN SUELO FORESTAL Y SU RELACIÓN CON LA CALIDAD DE LA HOJARASCA
Provedor de dados: 113
Autores: Arrigo,Nilda M.; Jiménez,María de la P.; Effron,Diana; Defrieri,Rosa.
Los objetivos de este trabajo fueron: a) evaluar el carbono de respiración como un índice de la actividad microbiológica en el suelo ubicado bajo las diferentes especies dominantes del sitio, y b) relacionar esta variable con la pérdida de peso resultante de la descomposición de las hojas de diferentes especies a través del año. El trabajo se realizó en un suelo forestal subtropical (27-28º lat. Sur y 56-60º long. Oeste), Chaco, Argentina, en la temporada 1996/97. Las especies arbóreas seleccionadas fueron: espina corona [Gleditsia amorphoides (Griseb.) Taub], guayaibí (Patagonula americana L.), mora [Chlorophora tinctoria (L.) Gaud.] y urunday (Astronium balansae Engl.). Se usó la técnica de las bolsitas para registrar la pérdida de peso en el campo de...
Tipo: Journal article
Palavras-chave: Suelos forestales; Descomposición de hojas; Variación estacional; C de respiración.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000200015

CARBONO ORGÁNICO DEL SUELO EN DIFERENTES USOS DEL TERRENO DE PAISAJES ANDINOS COLOMBIANOS
Provedor de dados: 127
Autores: Carvajal,Andrés F; Feijoo,Alexander; Quintero,Heimar; Rondón,Marco A.
Se estudió la relación de cambios en el uso del terreno con el C y N edáficos, en el municipio de Alcalá (región cafetera colombiana), entre 900 y 1600 m de elevación. Los suelos son Argiudolls y Melanudands y las unidades de muestreo fueron definidas según el gradiente altitudinal. Se midieron contenidos de C y N, relación C:N, densidad aparente y abundancias de 13C y 15N. Se encontraron diferencias significativas (p &lt; 0,05) por el efecto de la altura. La zona alta mostró mayores contenidos de C (37,06-42,88 t ha-1) y N (3,12 - 3,86 t ha-1), mayor relación C:N (11,17 - 11,97), menor densidad aparente (0.56 - 0.65 g cm"³) y abundancia de 15N (4,59 - 5,15%o). Barbechos y monocultivos almacenaron más carbono en la parte subterránea del suelo; mientras que...
Tipo: Journal article
Palavras-chave: Almacenamiento de carbono en los Andes; Cambios en el uso del terreno; Isótopos estable.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000300005

CARBONO ORGÁNICO Y PROPIEDADES DEL SUELO
Provedor de dados: 127
Autores: Martínez H,Eduardo; Fuentes E,Juan Pablo; Acevedo H,Edmundo.
El carbono orgánico del suelo (COS) se relaciona con la sustentabilidad de los sistemas agrícolas afectando las propiedades del suelo relacionadas con el rendimiento sostenido de los cultivos. El COS se vincula con la cantidad y disponibilidad de nutrientes del suelo, al aportar elementos como el N cuyo aporte mineral es normalmente deficitario. Además, al modificar la acidez y la alcalinidad hacia valores cercanos a la neutralidad, el COS aumenta la solubilidad de varios nutrientes. El COS asociado a la materia orgánica del suelo proporciona coloides de alta capacidad de intercambio catiónico. Su efecto en las propiedades físicas se manifiesta mediante la modificación de la estructura y la distribución del espacio poroso del suelo. La cantidad de COS no...
Tipo: Journal article
Palavras-chave: Sustentabilidad; Carbono orgánico del suelo; Propiedades del suelo; Secuestro de carbono.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000100006

Carcinoma de Células Claras Variedad No Hialinizante de Parótida: Comunicación de Dos Casos con Diferente Grado de Diferenciación
Provedor de dados: 77
Autores: Avila,R. E; Samar,M. E; Ferraris,L; Ferraris,R. V; Fonseca,I; Corball,A; Asís,O. G; Olmedo,L.
El carcinoma de células claras es una neoplasia rara de bajo grado que se desarrolla casi exclusivamente en glándulas salivales menores humanas. El objetivo de esta comunicación es analizar las características estructurales, histoquímicas e inmunohistoquímicas (IHQ) de dos casos de carcinoma de células claras de parótida y realizar el diagnóstico diferencial con otros tumores salivales primarios y metastásicos que presentan células claras. Cortes de ambos tumores fueron procesados para H/E, tricrómicos de Masson y Dane, Azul de toluidina, Azul alciano, PAS y PAS/diastasa; marcaciones IHQ para citoqueratinas de bajo y alto peso molecular, ki67, HMB45, p63 y proteína S-100. El patrón estructural de estos tumores estaba determinado por nidos y cordones de...
Tipo: Journal article
Palavras-chave: Parótida; Carcinoma de células claras; Inmunohistoquímica; Diagnóstico diferencial.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300045

Carcinoma de Células Escamosas de Labio Inferior: Asociación Entre Grado de Angiogénesis, Graduación Histológica y Frente de Invasión Tumoral
Provedor de dados: 77
Autores: Cantín López,Mario; Suazo Galdames,Iván; Venegas Rojas,Bernardo; Zavando Matamala,Daniela.
El carcinoma de células escamosas de la cavidad oral presenta una alta prevalencia en nuestro país, siendo el labio inferior el sitio más comúnmente afectado. El objetivo de este estudio fue determinar el grado de angiogénesis en el carcinoma de células escamosas de labio inferior, y su asociación con el grado de diferenciación según la Clasificación Internacional de Tumores y el Frente de Invasión Tumoral según el sistema de medición de Bryne, en pacientes con carcinoma de células escamosas de labio inferior, diagnosticados en los hospitales de Talca y Curicó, entre los años 1995 y 2005.
Tipo: Journal article
Palavras-chave: Carcinoma de células escamosas; Labio inferior; Angiogénesis; Graduación histológica; Frente de Invasión Tumoral.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100013

Carcinoma Epidermoide Primario de la Mama: Una Infrecuente Entidad Clínico-Patológica
Provedor de dados: 77
Autores: Tapia E,Oscar.
El carcinoma epidermoide (CE) puro primario de la mama es una rara entidad clínico-patológica, que representa menos del 0,1% de todos los carcinomas de mama, conformada en su totalidad por células escamosas malignas que no presentan relación anatómica con la piel adyacente de la mama. Su etiopatogenia, pronóstico y tratamiento son motivo de controversias. Presentamos 1 caso de CE puros primario de la mama diagnosticado en la Unidad de Anatomía Patológica del Hospital Hernán Henríquez Aravena de la ciudad de Temuco, Chile.
Tipo: Journal article
Palavras-chave: Carcinoma de células escamosas; Mama; Cáncer de mama.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300026

Carcinoma Mucoepidermoide de Glándulas Salivales: Factores Pronósticos Histológicos e Inmunohistoquímicos
Provedor de dados: 77
Autores: Avila,Rodolfo Esteban; Samar,María Elena; Fonseca,Ismael; Olmedo,Luis; Asís,Onell Gabriela; Ferraris,Ricardo.
Los tumores de las glándulas salivales representan entre el 2 y 3% de las neoplasias de cabeza y cuello. El carcinoma mucoepidermoide (CME) es el tumor maligno más común en las glándulas salivales; su comportamiento biológico se relaciona con el grado histológico tumoral (bajo, intermedio y alto). Está formado por células mucosas, epidermoides, intermedias, columnares y claras. El objetivo del presente trabajo fue presentar la casuística de CME de nuestro laboratorio en el período 1999-2009 para determinar grado histológico y potencial proliferativo como factores pronósticos ya que éstos son importantes para guiar el tratamiento y diseñar recomendaciones para los pacientes. Cortes seriados de 13 casos de CME se colorearon con H/E, Masson, PAS, Dane/Alcian...
Tipo: Journal article
Palavras-chave: Glándulas salivales; Carcinoma mucoepidermoide; Factores pronósticos.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200026

Cardia: at the End of the Day, what is it?
Provedor de dados: 77
Autores: Fregnani,José HumbertoTavares Guerreiro; Macea,José Rafael; Barros,Mirna Duarte; Liquidato,Bianca Maria; Macea,Maria Inez Marcondes; Alves,Adriana Leal; Pereira,Celina Siqueira Barbosa; Pinto,Antonio Cardoso; Carvalho,Maria de Fátima Pereira de; Carillo,Joáo.
There is no consensus about the precise definition of what the cardia is. Although this term is often utilized in the medical literature, it takes on a variety of meanings, depending on the context. For histologists and endoscopists, the cardia is a region of the stomach immediately below the gastroesophageal junction. However, the concepts of gastroesophageal junction used by histologists and endoscopists are not the same as used by anatomists. This junction is histologically defined as the abrupt transition from the nonkeratinized stratified squamous epithelium of the esophagus to simple columnar epithelium and corresponds to the endoscopically defined Z-line. Nevertheless, this epithelial change does not occur exactly in the anatomical transition...
Tipo: Journal article
Palavras-chave: Cardia; Gastroesophageal junction; Lower esophageal sphincter; Gastric mucosa; Terminology.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200023

Cardioprotective Effects of Exogenous and Endogenous Hydrocortisone in the Rabbit Model of Ischemia-Reperfusion
Provedor de dados: 77
Autores: Davarian,Ali; Khori,Vahid; Nayebpour,Mohsen.
Reducing the infarct size in acute myocardial infarction is one of the most important goals driving new drug research and development. During the last two decades, many clinical studies have found cardioprotective effects of corticosteroids, but their exact role in ischemic preconditioning remains questionable. The aim of the present study was to determine the protective effects of hydrocortisone sodium succinate on myocardial preconditioning in rabbit hearts. Twenty-four male New Zealand rabbits were divided randomly &amp;amp; equally in four groups: 1) control, 2) Infarct, 3) Ischemic preconditioning (IP) and 4) Hydrocortisone (HYD). The HYD group received 50mg/kg Hydrocortisone 45min before major ischemia. Serum levels of cardiac troponin-T(cTNT) and...
Tipo: Journal article
Palavras-chave: Hydrocortisone; Infarct size; Ischemia-reperfusion model; Ischemic preconditioning; Serum cortisole.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300001

Cardiovascular and ventilatory acclimatization induced by chronic intermittent hypoxia: A role for the carotid body in the pathophysiology of sleep apnea
Provedor de dados: 48
Autores: ITURRIAGA,RODRIGO; REY,SERGIO; DEL RÍO,RODRIGO.
Patients with obstructive sleep apnea (OSA) show augmented ventilatory, sympathetic and cardiovascular responses to hypoxia. The facilitatory effect of chronic intermittent hypoxia (CIH) on the hypoxic ventilatory response has been attributed to a potentiation of the carotid body (CB) chemosensory response to hypoxia. However, it is a matter of debate whether the effects induced by CIH on ventilatory responses to hypoxia are due to an enhanced CB activity. Recently, we studied the effects of short cyclic hypoxic episodes on cat cardiorespiratory reflexes, heart rate variability, and CB chemosensory activity. Cats were exposed to cyclic hypoxic episodes repeated during 8 hours for 4 days. Our results showed that CIH selectively enhanced ventilatory and...
Tipo: Journal article
Palavras-chave: Ventilatory acclimatization; Carotid body; Chemosensory activity; Intermittent hypoxia; Obstructive sleep apnea.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000400004

Carduus tenuiflorus Curtis (Asteraceae), nuevo registro para la flora alóctona de Chile
Provedor de dados: 73
Autores: Cordero,Sebastián; Gutiérrez,Diego G.; Moreira-Muñoz,Andrés.
ABSTRACT Carduus tenuiflorus Curtis is described as a new alien plant species for Chile, whose introduction into the country is proposed around the year 1928. An identification key for species of the genus Carduus L. present in Chile is added.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200453

Caroticoclinoid Foramen in Human Skulls: Incidence, Morphometry and its Clinical Implications
Provedor de dados: 77
Autores: Rodrigues Freire,Alexandre; Rossi,Ana Cláudia; Bevilacqua Prado,Felippe; Groppo,Francisco Carlos; Ferreira Caria,Paulo Henrique; Botacin,Paulo Roberto.
The caroticoclinoid foramen is an inconstant structure, formed by the union of the anterior and middle clinoid processes. The aim of this study was to perform an incidence and morphometry of the caroticoclinoid foramen in Brazilian human skulls and discuss its clinical implications. Eighty dry human skulls with sex distinction were used, and 3 groups of incidence were determined: General, sex, and sides. The morphometry was performed using a manual caliper and the major diameter of the foramina was measured; the values were also divided in general, according to sex and sides. The incidence of skulls with at least one foramen was 8.5%. According to the sides, 8.5% of the skulls showed foramen on the right side and 2.5% on the left. We found 2.5% of the...
Tipo: Journal article
Palavras-chave: Foramen; Morphometry; Carotid artery; Cranial fossa; Middle.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200021

Carotid Arteries in the Dog: Structure and Histophysiology
Provedor de dados: 77
Autores: Orsi,Antonio M.; Domeniconi,Raquel F.; Artoni,Silvana Martinez B.; Filho,Joffre G.
Light microscopy analysis of the mural structure of the common carotid artery, internal carotid artery and external carotid artery in mongrel dog revealed variability in the middle values of vascular diameter and thickness of the intimal plus medial coats and adventitial coat. The vascular diameter did not differ between the internal carotid artery and external carotid artery, but was significantly increased in the common carotid artery from which the other two arteries had origin. The increased thickness of the intimal plus medial coats of the common carotid artery revealed the constant mechanical adjustment of the arterial wall and local shearing stress that occurred among the arterial coats. The adventitial coat of the internal carotid artery was...
Tipo: Journal article
Palavras-chave: Carotid arteries; Histology; Histophysiology; Dog.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300019

Carotid body (Thermoreceptors, sympathetic neural activation, and cardiometabolic disease
Provedor de dados: 48
Autores: Iturriaga,Rodrigo; Del Rio,Rodrigo; Idiaquez,Juan; Somers,Virend K.
The carotid body (CB) is the main peripheral chemoreceptor that senses the arterial PO2, PCO2 and pH. In response to hypoxemia, hypercapnia and acidosis, carotid chemosensory discharge elicits reflex respiratory, autonomic and cardiovascular adjustments. The classical construct considers the CB as the main peripheral oxygen sensor, triggering reflex physiological responses to acute hypoxemia and facilitating the ventilatory acclimation to chronic hypoxemia at high altitude. However, a growing body of experimental evidence supports the novel concept that an abnormally enhanced CB chemosensory input to the brainstem contributes to overactivation of the sympathetic nervous system, and consequent pathology. Indeed, the CB has been implicated in several...
Tipo: Journal article
Palavras-chave: Autonomic dysfunction; Carotid body; Heart failure; Metabolic syndrome; Obstructive sleep apnea; Sympathetic activation.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100013

Carpobrotus edulis (L.) N.E. Br. (Aizoaceae) y su presencia en la flora de Chile
Provedor de dados: 73
Autores: SOTES,GASTÓN J.; CAVIERES,LOHENGRIN A.; RODRÍGUEZ,ROBERTO.
The genus Carpobrotus was represented on the Chilean flora only by native species C. chilensis. However, we found that the species native of South Africa C. edulis is naturalized in coastal areas. We report it for first time as an alien species for the Chilean territory.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100018

CARTA DEL EDITOR
Provedor de dados: 127
Autores: Mora Gilí,María de la Luz.
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000100001

CARTOGRAFÍA DE LAS PÉRDIDAS POTENCIALES DE N-UREA POR VOLATILIZACIÓN EN SUELOS DE CHILE CENTRAL
Provedor de dados: 127
Autores: Casanova P,Manuel; Benavides Z,Carlos.
Empleando información cartográfica y una base de datos se predijo la distribución espacial de la volatilización a partir de urea granular aplicada superficialmente en la zona central de Chile, bajo el supuesto que el potencial de pérdida amoniacal sólo depende de las propiedades del suelo, y que se asocian al espacio físico conocido como micrositio. Las propiedades relevantes (capacidad de intercambio catiónico, actividad ureásica, tamponamiento del pH y pH del suelo post-hidrólisis de la urea o pH/) para el proceso de pérdida de amoníaco, se definieron acorde a un modelo conceptual, determinándose que los valores umbrales para un alto potencial de pérdidas son: CIC &amp;#8804; 20 cmol(+) kg-1, actividad ureásica &amp;#8805; 40 N-urea g-1 h-1 and pH...
Tipo: Journal article
Palavras-chave: Funciones de pedotransferencia; Urea; Volatilización.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000100002

Cassava and the future of starch
Provedor de dados: 69
Autores: Tonukari,Nyerhovwo John.
The nutritive reserves of cassava is made up of starch, which is one of the most important products synthesized by plants that is consumed as food and used in industrial processes. The currently increasing cassava production will lead to higher amount of starch available making it cheaper for industrial processes, and opening up new markets. There is also abundant capacity in many tropical countries such as Nigeria to increase cassava production.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100003

Catalase enzyme in mitochondria of Saccharomyces cerevisiae
Provedor de dados: 69
Autores: Petrova,Ventsislava Yankova; Rasheva,Tanya Vassileva; Kujumdzieva,Anna V.
Catalase and superoxide dismutase activities have been explored in the yeast Saccharomyces cerevisiae during batchwise growth experiment. During the diauxic growth in YPD medium high Ys values were obtained (0.415 - 0.423) and correlation between the total activities of both enzymes has been found. A mitochondrial fraction from three type strains of Saccharomyces cerevisiae has been isolated. The purity of this fraction was proved through different enzyme assays: hexokinase, glucose-6-phosphate dehydrogenase, D-amino acid oxidase, isocitric lyase, succinate dehydrogenase. Then the catalase, peroxidase, Mn and Cu/Zn superoxide dismutase activities were evaluated in the mitochondrial fraction. Polyacrylamide gel electrophoresis separations allowed to...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100010

CATALOGO CRITICO E ILUSTRADO DE LAS ESPECIES DE LA FAMILIA SATURNIIDAE EN CHILE (LEPIDOPTERA: SATURNIIDAE)
Provedor de dados: 72
Autores: Angulo,Andrés O.; Lemaire,Claude; Olivares,Tania S.
Se revisan 19 especies de Saturniidae en Chile, distribuidas en 7 géneros: Adetomeris Michener, Ormiscodes Blanchard, Polythysana Walker, Cinommata Butler, Cercophana Felder, Microdulia Jordan, Neocercophana Izquierdo. Para cada especie se entrega una ficha de reconocimiento que incluyen sinónimos, datos biológicos, morfológicos, hospederos, referencias, distribución geográfica conocida, período de vuelo y fotografias de machos y hembras. Para la obtención de material se utilizaron ejemplares provenientes del Museo de Historia Natural de París, Francia (MNHN) y las Colecciones Científicas de la Universidad de Concepción, Chile (UCCC)
Tipo: Journal article
Palavras-chave: Hemileucinae; Cercophaninae; Taxonomía; Hospederos; Distribución.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100003

CATALOGO CRITICO Y NOMINAL DEL GENERO DARGIDA WALKER 1856 (LEPIDOPTERA, NOCTUIDAE, HADENINAE)
Provedor de dados: 72
Autores: Rodríguez,Marcela A.; Angulo,Andrés O.
El presente catálogo consiste en la lista alfabética de los nombres de las especies pertenecientes al género Dargida Walker, 1856 y que fueron descritas antes del 1 de junio del 2003. Strigania Hampson, 1905 y Faronta Smith, 1908 son sinónimos de Dargida Walker, 1856 por comparación de las especies tipo de cada género. El tratamiento dedicado a cada taxon específico incluye su sinonímia confirmada por citas y una mención de la localidad tipo. Como resultado, se obtiene una lista de 53 especies asignadas al género Dargida Walker. Se entregan 14 nuevas combinaciones
Tipo: Journal article
Palavras-chave: Dargida; Faronta; Strigania; Hadeninae; Noctuidae; Región Neotropical; Región Andino-Patagónica; Nuevas combinaciones; Nuevos registros.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100003

Catálogo de Asteraceae (Compositae) de la Región de Arica y Parinacota, Chile
Provedor de dados: 73
Autores: Moreira-Muñoz,Andrés; Muñoz-Schick,Mélica; Marticorena,Alicia; Morales,Vanezza.
RESUMEN La familia de las Asteráceas o Compuestas es la más diversa de la flora de Chile, sin embargo, sólo algunas tribus han sido sometidas a un tratamiento sistemático reciente, mientras que el conocimiento de la distribución geográfica de los taxones es aún muy deficiente. A partir de la revisión de ejemplares de herbario y trabajo de campo, se realizó una prospección de la flora de Asteráceas de la Región de Arica y Parinacota. Ello da como resultado la presencia de 144 taxones en la región, de los cuales un 82,6% es nativo (119) y un 9% es endémico (13) de Chile, mientras que el 8,3% restante corresponde a especies alóctonas o naturalizadas (12). El género Senecio es el más diverso en la región con 27 especies nativas, incluyendo seis especies...
Tipo: Journal article
Palavras-chave: Flora de Chile; Catálogo florístico; Reserva de la Biosfera Lauca; Conservación de la biodiversidad; Especies endémicas.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200226

CATALOGO DE LA FLORA VASCULAR DEL PARQUE NACIONAL PALI AIKE, XII REGION, CHILE
Provedor de dados: 73
Autores: Domínguez,Erwin; Marticorena,Clodomiro; Elvebakk,Arve; Pauchard,Aníbal.
We present a checklist of vascular plants for Pali Aike National Park, one of the world southernmost protected areas, located in Chilean Patagonia. The park conserves remnants of the Patagonian steppe ecosystem of the eastern side of the Straits of Magellan. 164 vascular species were recorded, from 44 families and 106 genera, comprising one Pteridophyta, one Gnetophyta, 114 Magnoliopsida and 48 Liliopsida. Exotic species make up 11% of the flora
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000200005

Catálogo de las plantas vasculares del cono sur (Argentina, southern Brazil, Chile, Paraguay y Uruguay)
Provedor de dados: 97
Autores: MARTICORENA,ALICIA.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400012

Catálogo de los tipos depositados en las colecciones zoológicas de la Universidad de Concepción (MZUC-UCCC) entre diciembre de 1992 y agosto de 2015
Provedor de dados: 72
Autores: ARTIGAS,JORGE N; SOLAR,ELVIRA S.
El Museo de Zoología de la Universidad de Concepción (MZUC-UCCC) presenta periódicamente los ingresos de material tipo a sus colecciones. La primera lista (Parte I), fue entregada en diciembre de 1968, sus autores Tomás Cekalovic y Jorge N. Artigas, consideraron todos los tipos de cualquier denominación. Las siguientes listas: Partes II-V, de los mismos autores, siguieron similar presentación (Parte II enero 1969-enero 1974; Parte III hasta septiembre de 1976; Parte IV hasta junio 1981; Parte V junio 1981-diciembre 1992). Posterior a la Parte V, hay un período de 22 años, debido a la jubilación y fallecimiento de don Tomás Cekalovic (curador). La presente Parte VI, fue elaborada por Jorge N. Artigas y E. Solar y considera los tipos ingresados entre...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200008

CATALYTIC POTENTIAL OF SOIL HYDROLASES IN NORTHEAST CHINA UNDER DIFFERENT SOIL MOISTURE CONDITIONS
Provedor de dados: 127
Autores: Zhang,Y.L; Sun,Cc.X; Chen,L.J; Duan,Z.H.
An incubation test with black soil (Phaeozem), Albic soil (Albic Luvisols), brown soil (Cambisols), and cinnamon soil (Chromic Luvisol) from Northeast China was conducted under the conditions of 10%, 20% and30 % field capacity, and the kinetic parameters of soil urease, phosphatase, and arylsulphatase were determined, aimed to study the changes in the catalytic potential of these enzymes under different soil moisture conditions. All test enzymes exhibited typical Michaelis-Menten kinetic behaviors. The test enzymes exhibited the highest enzyme-substrate affinity (l/Km) at 20% or 30% field capacity. With increasing soil moisture content, the Fmax of test soil urease decreased, while that of soil phosphatase and arylsulphatase increased, with the maximum...
Tipo: Journal article
Palavras-chave: Soil enzymatic kinetic parameters; Soil hydrolase; Soil moisture condition.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000200003

Catalytical properties of N-glycosylated Gluconacetobacter diazotrophicus levansucrase produced in yeast
Provedor de dados: 69
Autores: Trujillo Toledo,Luis Enrique; Gómez Riera,Raúl; Banguela Castillo,Alexander; Soto Romero,Melvis; Arrieta Sosa,Juan Gabriel; Hernández García,Lázaro.
The influence of N-glycosylation on the kinetic and catalytical properties of a bacterial fructosyltransferase (LsdA) produced in Pichia pastoris was studied. The glycosylated enzyme behaved similarly to non-glycosylated LsdA when substrate specificity, fructo-oligosaccharide (FOS) production, sucrose hydrolysis or levan formation reactions were carried out under different experimental conditions. The kinetic parameters for native or yeast-expressed LsdA determined at 60ºC, condition for the highest hydrolytic activity, followed a conventional Michaelis-Menten kinetics. Synthase activity of this levansucrase increased in water-restricted environments by addition of salt or organic solvent to the reaction mixtures
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200005

Catastro de vertebrados terrestres y análisis en seis habitats presentes en la Reserva Nacional Futaleufu, provincia de Palena, X Región, Chile
Provedor de dados: 72
Autores: Elgueta,Emma; Reid,Sharon; Pliscoff,Patricio; Méndez,Marco A; Núnez,José; Smith-Ramírez,Cecilia.
Se realizó un catastro de los mamíferos, aves, reptiles y anfibios presentes en seis hábitats de la Reserva Nacional Futaleufú, provincia de Palena, Chile. Estos hábitats se encuentran desde la cota 700 hasta los 2000 msnm, ellos son: cipresal, matorral mixto, bosque de lenga y coigüe, renoval de Nothofagus, mallín y bosque achaparrado de ñirres en sectores altos de roqueríos con nieves estacionales. Se registraron un total de 60 especies de vertebrados en la Reserva: 17 especies de mamíferos, 38 especies de aves, cuatro especies de anfibios y una especie de reptil. Se destaca la presencia de huemules en casi todos los hábitats. El análisis por hábitat muestra una mayor riqueza de especies en los bosques de lenga-coigüe, los cuales presentan además una...
Tipo: Journal article
Palavras-chave: Biodiversidad; Áreas silvestres protegidas; Fauna patagónica.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200006

CATCH COMPOSITION OF THE DEEP SEA SHRIMP FISHERY (Solenocera agassizi Faxon, 1893: FARFANTEPENAEUS CALIFORNIENSIS HOLMES, 1900 AND FARFANTEPENAEUS BREVIROSTRIS KINGSLEY, 1878) IN THE COLOMBIAN PACIFIC OCEAN
Provedor de dados: 72
Autores: Puentes,Vladimir; Madrid,Nayibe; Zapata,Luis A.
The Colombian deep sea shrimp fishery is carried out by vessels with double bottom trawl fishing gear. There is a wide variety in the catch composition species, in which many of them have a wide distribution depth range. Fifty four fish species of 35 families, 11 crustacean species of 11 families, and one mollusk species were identified. Some holothurians, gastropods, echinoderms and other mollusks also appeared occasionally. The joint analysis of the current and former studies determined 85 species in the catch composition of this fishery. The Colombian bottom trawl fishery is actually using the turtle excluder device as the only technical adaptation of the fishing gear to reduce the bycatch turtles, but seems to exclude other big size commercial bycatch....
Tipo: Journal article
Palavras-chave: Deep sea shrimp; Catch composition; Faunal bycatch.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100009

Cattle manure and N-urea in radish crop (Raphanus sativus)
Provedor de dados: 118
Autores: Mendoza Cortez,Juan W; Cecílio Filho,Arthur B; Coutinho,Edson L; Alves,Anarlete.
This work was carried out in Jaboticabal (575 m altitude, 21°15&amp;#900; 22&amp;#733; S and 48° 15&amp;#900; 58&amp;#733; W), São Paulo, Brazil, aiming to investigate the effects of cattle manure and nitrogen (urea) doses on radish height and yield. Randomized blocks were used with a 2x4x4 factorial scheme and 3 replications. The treatments were combinations of cultivars (25 and 19), cattle manure doses (0, 25, 50, and 75 t ha-1 dry basis) and N doses (0, 60, 120 and 180 kg ha-1). Increased cattle manure and urea doses provided higher plant height and commercial yield in both cultivars, but the N produced more signifcant effects than the cattle manure. The maximum commercial yield of cultivar (cv) 19 (20.34 t ha-1) was obtained using 75 t ha-1 of cattle...
Tipo: Journal article
Palavras-chave: Raphanus sativus; Fertilization; Yield.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100004

Caudofrontal Depression on the Cornual End of the Temporal Line of the Skull of Goat Breeds in Nigeria
Provedor de dados: 77
Autores: Olopade,James Olukayode; Onwuka,Silas Kalu; Kwari,Hyelduku Danladi; Oke,Bankole Olusiji.
A comparative study of skull types was done using 65 skulls obtained from three different goat breeds in Nigeria namely; Red Sokoto, Sahel and West African Dwarf. A unique depression was consistently found at the cornual end of the temporal line of the skull medial to the middle portion of the caudal boundary of the orbit and dorsal to the lateral portion of the parietofrontal suture. The depression was found in all the breeds studied, and in both sexes on the lateral sides of both cornual processes of the frontal bones. The features (depth, height and width) of the depression were found to vary without regard to either sex or breed. A search of the literature did not yield any information on this depression in the skull of the goat. Consequently, we...
Tipo: Journal article
Palavras-chave: Skull; Goat breds; Caudofrontal depression.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400009

CAUQUENES-INIA, NUEVO CULTIVAR DE HUALPUTRA CHILENA (Medicago polymorpha) PARA AREAS DE SECANO MEDITERRANEO.
Provedor de dados: 113
Autores: Ovalle M.,Carlos; del Pozo L.,Alejandro; Avendaño R.,Julia; Aravena,Teresa; Díaz,M. Elena.
Cauquenes INIA es el primer cultivar de hualputra (Medicago polymorpha L.), liberada por el Centro Experimental Cauquenes del Instituto de Investigaciones Agropecuarias (INIA). Fue seleccionado desde una colección de germoplasma que obtenida en una expedición a través de la zona Mediterránea de Chile, entre La Serena (29º 55’ lat. S) y Temuco (38º 47’ lat. S), en 1988. Es una leguminosa forrajera anual, para zonas de secano mediterráneo subhúmedo y húmedo, especialmente apropiada para sistemas agrícolas donde la pradera va en rotación con cereales ("ley farming systems"). Es un cultivar semiprecoz, de hábito de crecimiento semi-erecto, flores de color amarillo, gloquídeos sin espinas, y alto porcentaje de semillas duras. La producción de materia seca (6570...
Tipo: Journal article
Palavras-chave: Clima mediterráneo; Chile; Leguminosa forrajera; Medicago anual; Materia seca; Semillas.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100010

Caveolae and caveolae-like membrane domains in cellular signaling and disease: Identification of downstream targets for the tumor suppressor protein caveolin-1
Provedor de dados: 48
Autores: BENDER,FLORENT; MONTOYA,MARGARITA; MONARDES,VIRGINIA; LEYTON,LISETTE; QUEST,ANDREW F.G.
Caveolae are small, flask-shaped invaginations of the plasma membrane present on a large number of mammalian cells. Recent results obtained with knock-out mice for the gene caveolin-1 demonstrate that expression of caveolin-1 protein is essential for caveolae formation in vivo. Caveolae are implicated in a wide variety of cellular events including transcytosis, cholesterol trafficking and as cellular centers important in coordinating signalling events. Caveolae share this role and the property of detergent insolubility with plasma membrane assemblies rich in glycosphingolipids and cholesterol, often called lipid rafts, but preferably referred to here as caveolae-like membrane domains. Due to such widespread presence and usage in cellular function, caveolae...
Tipo: Journal article
Palavras-chave: Caveolae; Caveolae-like domains; Lipid rafts; Caveolin-1; Tumor suppressor; Colon carcinoma cells; Microarray analysis.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000200006

Caveolin-1-mediated post-transcriptional regulation of inducible nitric oxide synthase in human colon carcinoma cells
Provedor de dados: 48
Autores: FELLEY-BOSCO,EMANUELA; BENDER,FLORENT; QUEST,ANDREW F.G.
Reactive oxygen species are now widely recognized as important players contributing both to cell homeostasis and the development of disease. In this respect nitric oxide (NO) is no exception. The discussion here will center on regulation of the inducible form of nitric oxide synthase (iNOS) for two reasons. First, only iNOS produces micromolar NO concentrations, amounts that are high by comparison with the picomolar to nanomolar concentrations resulting from Ca2+-controlled NO production by endothelial eNOS or neuronal nNOS. Second, iNOS is not constitutively expressed in cells and regulation of this isoenzyme, in contrast to endothelial eNOS or neuronal nNOS, is widely considered to occur at the transcriptional level only. In particular, we were...
Tipo: Journal article
Palavras-chave: Inducible nitric oxide synthase; Proteosome_mediated proteolysis; Nitroxysomes; Cytokines; Caveolae; Caveolin-1.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000200007

Cavum Septum Pellucidum: Hallazgo Mediante Disección Neuroanatómica
Provedor de dados: 77
Autores: Duque Parra,Jorge Eduardo.
Se reporta una marcada cavitación a nivel del septum pellucidum, un gran cavum septum pellucidum de una persona adulta, en el espacio reconocido generalmente como cerrado del sistema nervioso central, que se hace evidente como tal, en ciertas fases de la vida intrauterina. Esta cavitación está ausente en el adulto sano, pero en algunas personas esquizofrénicas y con demencia pugilística, dicha cavidad, puede considerarse como un hallazgo de relativa frecuencia. Este hallazgo se encontró aleatoriamente en uno de cuarenta y dos encéfalos de adultos, valorados superficialmente desde la anatomía macroscópica como normales. Dicho hallazgo posiblemente se asocie con desórdenes conductuales, en vista que dicho encéfalo correspondía a un individuo proveniente de...
Tipo: Journal article
Palavras-chave: Cavum septum pellucidum; Neuroanatomía; Disección.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400039

CD4+ T cells in aged or thymectomized recipients of allogeneic stem cell transplantations
Provedor de dados: 48
Autores: Takahashi,Hiroshi; Ikeda,Kazuhiko; Ogawa,Kazuei; Saito,Syunnichi; Ngoma,Alain M; Mashimo,Yumiko; Ueda,Koki; Furukawa,Miki; Shichishima-Nakamura,Akiko; Ohkawara,Hiroshi; Nollet,Kenneth E; Ohto,Hitoshi; Takeishi,Yasuchika.
BACKGROUND: CD4+CD25highFOXP3+ regulatory T (Treg) cells, which include thymus-derived and peripherally induced cells, play a central role in immune regulation, and are therefore crucial to prevent graft-versus-host disease (GVHD). The increasing use of allogeneic hematopoietic stem cell transplantation (allo-HSCT) for elderly patients with thymus regression, and our case of allo-HSCT shortly after total thymectomy, raised questions about the activity of thymus-derived Treg cells and peripherally induced Treg cells, which are otherwise indistinguishable. RESULTS: We found that despite pre-transplant thymectomy or older age, both naïve and effector Treg cells, as well as naïve and effector conventional T cells, proliferated in allo-HSCT recipients. Higher...
Tipo: Journal article
Palavras-chave: Regulatory T cells; Allogeneic hematopoietic stem cell transplantation; Thymus; Graft-versus-host disease.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100041

CDX-2, MUC-2 and B-catenin as intestinal markers in pure mucinous carcinoma of the breast
Provedor de dados: 48
Autores: García-Labastida,Laura; Garza-Guajardo,Raquel; Barboza-Quintana,Oralia; Rodríguez-Sanchez,Irám Pablo; Ancer-Rodríguez,Jesús; Flores-Gutierrez,Juan Pablo; Gómez-Macías,Gabriela Sofía.
BACKGROUND: Pure mucinous adenocarcinoma of the breast is a rare entity characterized by the production of variable amounts of mucin comprising 1% to 6% of breast carcinomas. Some mucinous adenocarcinomas have shown expression of intestinal differentiation markers such as MUC-2. This study examines the expression of intestinal differentiation markers in this type of breast carcinoma. RESULTS: Twenty-two cases of pure mucinous adenocarcinoma of the breast were assessed. Immunochemistry was performed for beta-catenin, CDX-2 and MUC-2. All cases were positive for B-catenin. MUC-2 positivity was observed in all cases; 63. 6% were 3 plus positive. All cases were negative for CDX-2. CONCLUSIONS: These results suggest that mucinous breast carcinomas express some...
Tipo: Journal article
Palavras-chave: Breast mucinous carcinoma; Inmunohistochemical; Intestinal differentiation.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100043

Ceftiofur-loaded PHBV microparticles: A potential formulation for a long-acting antibiotic to treat animal infections
Provedor de dados: 69
Autores: Vilos,Cristian; Constandil,Luis; Herrera,Natalia; Solar,Paula; Escobar-Fica,Jorge; Velásquez,Luis Alberto.
Background: The infectious diseases in the livestock breeding industry represent a significant drawback that generates substantial economic loss and have led to the indiscriminate use of antibiotics. The formulation of polymeric microparticles loaded with antibiotics for veterinary use can: reduce the number of required doses; protect the drug from inactivation; and maintain a sustained-release of the antibiotic drug at effective levels. Accomplishing all of these goals would have a significant economic and animal health impact on the livestock breeding industry. Results: In this work, we formulated ceftiofur-loaded PHBV microparticles (PHBV-CEF) with a spherical shape, a smooth surface and diameter sizes between 1.65 and 2.37 &amp;#956;m. The...
Tipo: Journal article
Palavras-chave: Ceftiofur; Drug delivery; Livestock breeding industry; PHBV; Polymeric microparticles.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400001

Celecoxib decreases growth and angiogenesis and promotes apoptosis in a tumor cell line resistant to chemotherapy
Provedor de dados: 48
Autores: Rosas,Carlos; Sinning,Mariana; Ferreira,Arturo; Fuenzalida,Marcela; Lemus,David.
BACKGROUND: During the last few years it has been shown in several laboratories that Celecoxib (Cx), a non-steroidal anti-inflammatory agent (NSAID) normally used for pain and arthritis, mediates antitumor and antiangiogenic effects. However, the effects of this drug on a tumor cell line resistant to chemotherapeutical drugs used in cancer have not been described. Herein we evaluate the angiogenic and antitumor effects of Cx in the development of a drug-resistant mammary adenocarcinoma tumor (TA3-MTXR). RESULTS: Cx reduces angiogenesis in the chick embryonic chorioallantoic membrane assay (CAM), inhibits the growth and microvascular density of the murine TA3-MTXR tumor, reduces microvascular density of tumor metastases, promotes apoptosis and reduces...
Tipo: Journal article
Palavras-chave: Angiogenesis; Celecoxib; Tumor.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100027

Celecoxib/PLGA Suprime Angiogénesis y Metástasis Pulmonar de un Cáncer Mamario Murino Experimental
Provedor de dados: 77
Autores: Roa,Ignacio; Cantín,Mario; Muñoz,Mariela; Rosas,Carlos; Lemus,David.
La angiogénesis y metástasis son eventos esenciales en el proceso de invasión tumoral. Su relación íntima los hace buenos blancos en la terapia antitumoral. El objetivo fue analizar el patrón de metástasis pulmonar y angiogénesis, luego de la aplicación del antiangiogénico Celecoxib microencapsulado en ácido poli(láctico-co-glicólico) en ratones. Se utilizó un modelo de tumor experimental, inducido por células TA3-MTX-R, en 18 ratones, separados en 3 grupos de 6 animales, los cuales fueron tratados con dos presentaciones de Celecoxib en administración intramuscular (Grupo Control; Grupo Cx 1000 ppm y Grupo Cx 1000 ppm+PLGA). Los ratones fueron sacrificados y procesados histológicamente para ser teñidos con H&amp;E y Tricrómico de Arteta. El estudio reveló...
Tipo: Journal article
Palavras-chave: Angiogénesis; Metástasis; Pulmón; Cáncer; Celecoxib; PLGA.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100048

Celiac Trunk Compression Syndrome: A Review
Provedor de dados: 77
Autores: Petrella,Selma; Prates,José Carlos.
The purpose of the present review is to report the anatomic and the clinical-surgical aspects involved in the celiac trunk compression syndrome by the median arcuate ligament of the diaphragm, reviewing the major findings of the syndrome in the anatomic field during dissection of cadavers, followed by clinical-surgical findings of stenosis of the celiac trunk, the relationship of this stenosis with the patient's symptoms and healing after decompression of that artery; invasive and non-invasive methods used to diagnose compression; the stenotic effect of physiologic mechanisms of the median arcuate ligament, aorta and celiac trunk displacement during respiration; anatomy of the aortic channel and celiac plexus; the median arcuate ligament and the celiac...
Tipo: Journal article
Palavras-chave: Celiac artery; L igaments; Celiac plexus; Syndrome; Diaphragm; Arterial occlusive disease.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400022

Celio-mesenteric Trunk Associated with Giant Omphalocele: Surgical Consequences
Provedor de dados: 77
Autores: Laquievre,Antoine; Hitier,Martin; Petit,Thierry; Ravasse,Philippe; Rod,Julien.
We report the first case of a newborn presenting with a celio-mesenteric trunk variation associated with a giant omphalocele. The celio-mesenteric trunk was unexpected and unseen during the staged surgical closure. After partial reintegration of the liver, the newborn presented refractory hypovolemia with anuria, leading to redo surgery. This procedure revealed ischemia of the liver and necrosis of the entire gastrointestinal tract except the colon. Despite treatment, including liver externalization, the infant did not survive. The autopsy revealed a celio-mesenteric trunk, a rare anomaly characterized by a common origin of the celiac axis and the superior mesenteric artery from the aorta. This association may explain the dramatic consequences of the...
Tipo: Journal article
Palavras-chave: Celio-mesenteric trunk; Mesenteric arterial variation; Mesenteric ischemia; Giant omphalocele; Sodium valproate.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300023

Cell size and basal metabolic rate in hummingbirds
Provedor de dados: 97
Autores: Opazo,Juan C.; Soto-Gamboa,Mauricio; Fernández,Maria José.
Nucleotypic theory suggests that genome size play indirect roles in determining organismal fitness. Among endotherms this theory has been demonstrated by an inverse correlation between basal metabolic rate (BMR) and genome size. Nonetheless, accumulation of variables, especially for some key groups of endotherms, involved in C-value enigma (e.g., cell size) will fortify this theory. In this sense, hummingbird species are of particular interest because they are an energetic extreme in avian and endotherm evolution. Knowing that cell size is proportional to C-value, in this study we tested for a relationship between mean corpuscular volume of red blood cells and BMR in four species of hummingbirds ranging from 4 to 20 g. In comparison with other birds, our...
Tipo: Journal article
Palavras-chave: Hummingbirds; Nucleotypic theory; Basal metabolic rate; Mean corpuscular volume.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200010

Cell surface and gene expression regulation molecules in dystrophinopathy: mdx vs. Duchenne
Provedor de dados: 48
Autores: FADIC,RICARDO.
Duchenne muscular dystrophy (DMD) is secondary to loss-of-function mutations in the dystrophin gene. The causes underlying the progression of DMD, differential muscle involvement, and the discrepancies in phenotypes among species with the same genetic defect are not understood. The mdx mouse, an animal model with dystrophin mutation, has a milder phenotype. This article reviews the available information on expression of signaling-related molecules in DMD and mdx. Extracellular matrix proteoglycans, growth factors, integrins, caveolin-3, and neuronal nitric oxide synthase expression do not show significant differences. Calcineurin is inconsistently activated in mdx, which is associated with lack of cardiomyopathy, compared to the permanent calcineurin...
Tipo: Journal article
Palavras-chave: Dystrophinopathy; Signaling molecules; Duchenne muscular dystrophy.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000400010

Cellular Changes in the Placenta in Pregnancies Complicated with Diabetes
Provedor de dados: 77
Autores: Verma,Ranjana; Mishra,Sabita; Kaul,Jagat Mohini.
Placenta is the most accurate record of the infant prenatal experience. After delivery if the placenta is examined minutely, it provides much insight into the prenatal health of the baby and the mother. In diabetic pregnancy, placental weight is higher in comparison to normal pregnancy. To study the cellular differences that might contribute to larger size of placenta, light microscopic analysis was performed on 25 full term placentas, out of which 20 were of Gestational diabetes mellitus (12 controlled on diet, 8 controlled on insulin) and 5 control group. Tissue sections were processed and analyzed. Birth weight of neonate, placental weight, vascular pattern of chorionic blood vessels and site of attachment of umbilical cord were recorded. In the...
Tipo: Journal article
Palavras-chave: Placenta; Gross; Gestational diabetes; Microscopy.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100038

Cellular Responses in the Respiratory Tract Following Intranasal administration of Peste des petits Ruminant Vaccine in Goats
Provedor de dados: 77
Autores: Ezeasor,C. V; Emikpe,B. O; Yussof,Sabri M; Afusat,Jagun; Anosa,V. O.
A trial was conducted to compare the cellular responses in the respiratory tract in intranasal vaccination against caprine Peste des petits ruminant lineage 1 variant virus infection with intramuscular and subcutaneous vaccinations in order to elucidate the mechanism of the protection. Twenty four goats were divided into four equal groups. Group 1 was vaccinated intranasaly, group 2 was vaccinated subcutaneously, and group 3 intramuscularly, while Group 4 was the unvaccinated control group. In each group the vaccinations were carried out once. All goats were challenged intratrachealy with PPR virus at a concentration of 106.5 TCID50 two weeks after vaccination and were euthanised 21 days after the challenge. The bronchoalveolar lavage differential count,...
Tipo: Journal article
Palavras-chave: Cellular responses; Intranasal administration; Peste des petits ruminant vaccine; Goats.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200056

Cellular Signaling
Provedor de dados: 48
Autores: LEYTON,LISETTE; QUEST,ANDREW F. G.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000200001

Cellulase production by thermophilic Bacillus sp: SMIA-2 and its detergent compatibility
Provedor de dados: 69
Autores: Ladeira,Silvania A; Cruz,Erica; Delatorre,Andréia B; Barbosa,João B; Leal Martins,Meire Lelis.
Background This paper reports the production of cellulase by thermophilic Bacillus sp. SMIA-2 using sugarcane bagasse and corn steep liquor as substrates. Some biochemical properties of the enzyme were also assessed for the purposes of exploiting its potential in the detergent industry, as well as other suitable applications. Results Bacillus sp. produced cellulases when cultivated at 50°C in liquid cultures containing sugarcane bagasse and corn steep liquor. Maximum avicelase (0.83 U mL-1) and CMCase (0.29 U mL-1) activities were reached in 120 h and 168 h of culturing time, respectively. The avicelase and CMCase presented an optimum activity at pH of 7.5 and 8.0, respectively. The maximum stability of avicelase and CMCase was observed at a pH range...
Tipo: Journal article
Palavras-chave: Avicelase; Carboxymethylcellulase; Corn steep liquor; Sugarcane bagasse.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200008

Células Cebadas en Pulmón y Nervio Periférico en la Intoxicación Crónica con Karwinskia humboldtiana en Rata Wistar: Estudios Histológico e Histoquímico
Provedor de dados: 77
Autores: García,G. R; Salazar,L. M. E; Becerra,V. E. M; Romero,D. V; García,J. J; Soto,D. A; Sepúlveda,S. J.
Karwinskia humboldtiana (Kh) es un arbusto venenoso responsable de numerosos casos de intoxicación accidental en humanos. En estudios previos en nuestro laboratorio reportamos un incremento de células cebadas en nervio periférico (NP) durante la intoxicación con Kh, este hallazgo no ha sido reportado previamente en otros órganos durante esta intoxicación por lo que en el presente estudio buscamos la presencia de estas células en otros órganos, además de distinguir subpoblaciones de células cebadas mediante reacciones histoquímicas para la identificación de los gránulos de secreción. El objetivo de este estudio fue evaluar la presencia de células cebadas en órganos distintos al NP y diferenciar histoquímicamente la composición de sus gránulos. Se utilizaron...
Tipo: Journal article
Palavras-chave: Karwinskia humboldtiana; Nervio periférico; Pulmón; Células cebadas.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400012

Células Cebadas y sus Patrones de Expresión del Receptor c-Kit (CD117) como Probables Indicadores de Metástasis en el Adenocarcinoma de Mama en Humanos
Provedor de dados: 77
Autores: Hernández-Alvidrez,Oscar Mario; Soto-Domínguez,Adolfo; González-Murillo,Eduardo Alfredo; Castelán-Maldonado,Edmundo Erbey; García-Garza,David; García-Garza,Rubén.
El adenocarcinoma de mama es la segunda neoplasia maligna más común en mujeres, solo después del cáncer de pulmón. Este tumor se clasifica histopatológicamente en bien, moderado y poco diferenciado. Además de esta clasificación, los análisis actuales utilizan inmunohistoquímica para identificar receptores hormonales para estrógenos y progesterona (RH) y HER2/neu, esta información permite hacer un pronóstico de respuesta al tratamiento y tiempo de sobrevida. Las células cebadas se han asociado a un mal pronóstico, ya que participan en la angiogénesis y el crecimiento tumoral favoreciendo la metástasis. Esto disminuye la esperanza de vida. También las células cebadas expresan en la membrana plasmática el receptor c-Kit (CD117) que se ha asociado a...
Tipo: Journal article
Palavras-chave: Adenocarcinoma de mama; Metástasis; Células cebadas.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200040

Células de la Cresta Neural y su Relación con Cardiopatía Congénita: Revisión Sistemática de la Literatura
Provedor de dados: 77
Autores: Ramos,Víctor; Roa,Ignacio.
Las cardiopatías congénitas corresponden al grupo de anomalías del desarrollo que se presentan con mayor frecuencia. Durante el desarrollo cardíaco participan distintos linajes celulares, donde destacan las Células de la Cresta Neural (CCN) por su amplia gama de derivados embriológicos y la susceptibilidad de afectar a múltiples sistemas si su función es alterada. El objetivo fue determinar el rol que cumplen las CCN durante el desarrollo cardíaco y las cardiopatías congénitas asociadas. Se diseñó un estudio descriptivo en base a una revisión sistemática de la literatura de las bases de datos MEDLINE y Scopus, utilizando la combinación de términos MeSH: ("Heart Diseases/congenital" OR "Heart Diseases/embriology" OR "Heart Diseases/etiology" OR "Heart...
Tipo: Journal article
Palavras-chave: Cardiopatía congénita; Cresta neural; Células de la Cresta neural; Embriología.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200013

Células Neuroendocrinas en Yemas Gustativas Primordiales
Provedor de dados: 77
Autores: Fierro-Murga,Ricardo; Ceballos-Salobreña,Alejandro; Gaitán-Cepeda,Luis.
El objetivo del trabajo fue identificar la presencia de células neuroendócrinas en yemas gustativas primordiales (fetales) humanas. Fueron utilizadas 15 lenguas fetales humanas obtenidas de abortos espontáneos (tiempo de gestación 23 semanas) de pacientes ingresados en el Hospital General, Chihuahua, México. Una muestra representativa del ápex lingual fue embebida en parafina y cortada a 3 micras para ser procesadas con la técnica inmunohitoquímica utilizando los siguientes anticuerpos: Anti-sinaptofisina; anti-proteína neurofilamento; anti-cromogranina; anti-citoqueratina 20; y anti proteínas-S100. El protocolo de investigación fue aprobado por los comités de bioética de las instituciones participantes. Se obtuvo la autorización de los padres para la...
Tipo: Journal article
Palavras-chave: Yemas gustativas; Células gustativas; Neuroendócrino; Cromogranina.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200013

CELULAS SANGUINEAS DE SCHROEDERICHTHYS CHILENSIS (GUICHENOT 1848) (ELASMOBRANCHII, SCYLIORHINIDAE): LA SERIE BLANCA
Provedor de dados: 72
Autores: Valenzuela,Ariel; Oyarzún,Ciro; Silva,Víctor.
La Ictiohematología es una herramienta de uso común con fines clínicos en peces de importancia económica, con un menor aporte en la comprensión de la fisiología del organismo en relación con su medio. En este contexto y frente a la escasa información publicada de aspectos hematológicos de condrictios, se propuso caracterizar los leucocitos de la pintarroja Schroederichthys chilensis y determinar los valores de referencia cuantitativos. Se obtuvo sangre de pintarrojas capturadas en la bahía Coliumo (VIII Región, Chile). En extensiones teñidas con May-Grünwald Giemsa se caracterizó los siguientes leucocitos: linfocitos, granulocitos eosinófilos, granulocitos polimorfonucleares heterófilos, monocitos, blastos y trombocitos. Los leucocitos, en general,...
Tipo: Journal article
Palavras-chave: Schroederichthys chilensis; Hematología; Leucocitos; Eosinofilia; Tripanosoma; Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100018

Células Troncales Derivadas del Tejido Adiposo
Provedor de dados: 77
Autores: Meruane,Manuel; Rojas,Mariana.
Con el objeto de regenerar órganos y funciones se han estudiado las células troncales. Las células troncales adultas poseen la ventaja que pueden ser obtenidas de individuos adultos sin los problemas éticos que trae el uso de células embriónicas. La obtención de células troncales desde el tejido adiposo (ASCs) ha sido una revolución el tema ya que estas células pueden ser obtenidas en grandes cantidades, con mínimo disconfort y hasta con anestesia local. Si comparamos las ASCs versus las células troncales derivadas de la médula ósea (BM-MSCs) sus características fenotípicas y el potencial de diferenciación son muy similares. En esta revisión veremos la técnica de obtención de ACSs, sus características moleculares, su capacidad de diferenciación en los...
Tipo: Journal article
Palavras-chave: Células troncales; Tejido adiposo.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300035

Células Troncales en el Desarrollo y las Perspectivas de Reprogramación Celular para la Regeneración
Provedor de dados: 77
Autores: Muñoz,L; Concha,M. L.
Los organismos multicelulares se desarrollan a partir de una sola célula: el cigoto. A lo largo de su ontogenia, las células que derivan del cigoto despliegan distintos programas celulares, los cuales son estabilizados por mecanismos epigenéticos. Los programas de las células troncales son más inclusivos, siendo mayor el silenciamiento que la activación de genes durante el proceso de diferenciación celular. Experimentalmente, se ha logrado que células en estado de diferenciación terminal reactiven el programa de células troncales y recuperen su pluripotencialidad, proceso llamado reprogramación. Esto despierta esperanzas en el avance de una medicina regenerativa con nuevas capacidades para el tratamiento de enfermedades crónicas, sin las restricciones...
Tipo: Journal article
Palavras-chave: Células troncales; Pluripotencialidad; Reprogramación celular; Factores de transcripción; Oct4; Sox2; Nanog; Medicina regenerativa.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400015

Central actions of somatostatin in the generation and control of breathing
Provedor de dados: 48
Autores: Llona,Isabel; Eugenín,Jaime.
The neuropeptide somatostatin is involved in many functions in the central nervous system as well as in the periphery. When it is centrally injected, an irreversible apnea is often developed. In the present review, we discuss the effects of somatostatin as the result of its actions at three levels of the respiratory neural network: a) by modulating the output of cranial or spinal motoneurons; b) by altering the genesis of the respiratory rhythm in the brainstem; and c) by regulating the chemosensory drive input into the respiratory pattern generator
Tipo: Journal article
Palavras-chave: Apnea; Brainstem; Chemoreceptors; Respiratory rhythm.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000400006

Cepa antártica de Bacillus sp., con actividad extracelular de tipo agarolítica y alginatoliasa
Provedor de dados: 72
Autores: Lavin,Paris; Gallardo-Cerda,Jorge; Torres-Diaz,Cristian; Asencio,Geraldine; Gonzalez,Marcelo.
Diversas bacterias asociadas a macroalgas pueden usar ficocoloides como fuente de carbono. Las bacterias de la Antártica, poseen características fisiológicas adaptativas que habrían evolucionado para permitir su supervivencia y funcionamiento dentro de las condiciones adversas de ese ecosistema. Por lo tanto, bacterias aisladas desde algas antárticas podrían tener la capacidad de degradar enzimáticamente azúcares complejos a temperaturas inferiores que aquellas aisladas desde zonas más cálidas, lo que potencialmente podría tener aplicaciones en la mejora en procesos industriales que utilizan enzimas. El análisis del gen ribosomal 16S indica que la cepa bacteriana aislada desde algas varadas en la Isla Rey Jorge (Antártica), pertenece al género Bacillus. El...
Tipo: Journal article
Palavras-chave: Bacillus; Antártica; Agarasa; Alginatoliasa.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200001

Cephalic and Facial Indices Among Kosovo-Albanian Population
Provedor de dados: 77
Autores: Staka,Gloria; Disha,Metush; Dragidella,Fatmir.
Cephalic and facial indices are used to estimate the racial and sex differences. This study was carried out to establish standards for craniofacial variables and distribution of cephalic and facial indices in Kosovo - Albanian population. The study population consisted of 204 dental students (101 males and 103 females, aged 18 to 30). Four basic craniofacial variables (head length, head breadth, morphological face height and face breadth) were measured to obtained cephalic and facial indices. All measured craniofacial variables are considerably higher in males than in females (p&lt;0.0001). In the Kosovo ­ Albanian population brachycephalic type of head (44.61 %) and hyperleptoprosopic type of face (63.34%) prevail.
Tipo: Journal article
Palavras-chave: Cephalic index; Facial index; Brachycephalic; Hyperleptoprosopic; Kosovo-Albanian Population.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200017

Cephalic Index of Ogbia Tribe of Bayesla State
Provedor de dados: 77
Autores: Eroje,M. A; Fawehinmi,H. B; Jaja,B. N; Yaakor,L.
A study on Cephalic Index was carried out on subjects from Ogbia tribe of Bayelsa State in the Niger Delta region of Nigeria. Four hundred and fourty individuals were randomly selected from the community comprising of 219 males and 221 females respectively. The ages of the subjects ranged from 2-18 years. The length and breadth of the head was measured using a sliding caliper from standard bony landmarks. The measurable point for head length was measured between the glabella and opisthocranion while the head breadth was the widest biparietal diameter from euryon (eu) on one side of the head to euryon (eu), on the other side. Mean values of cephalic index, standard deviation and standard error of mean were calculated for both sexes. The result showed that...
Tipo: Journal article
Palavras-chave: Cephalic index; Dolichocephalic; Ogbia; Forensic Medicine.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200009

Cephalic Vein: Detail of its Anatomy in the Deltopectoral Triangle
Provedor de dados: 77
Autores: Yeri,Luis Andrés; Houghton,Eduardo Javier; Palmieri,Bruno; Flores,María; Gergely,Marcelo; Gómez,Jorge E.
The cephalic vein shows a scarce description, especially in the deltopectoral triangle, and its ending in the axillary vein. Some established considerations such as "superficial vein, located in the deltopectoral groove, accompanied by braches of the thoraco-acromial artery, which ends in the deltopectoral triangle in the shape of fan arch" should be reevaluated. Procedures difficulties in the la catheterization deserve for a more accurate description. A descriptive, prospective study is performed. The goal is to determine the anatomy of the cephalic vein in the deltopectoral triangle, with a special focus on the characteristics concerning its path and type of termination. Findings show that the cephalic vein is deeply placed and has a different path than...
Tipo: Journal article
Palavras-chave: Cephalic vein; Deltopectoral triangle; Claviepectoral triangle; Catheterization; Venous access.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400013

Cephalofacial Morphological Characteristics of Albanian Kosova Population
Provedor de dados: 77
Autores: Rexhepi,Agron; Meka,Vjollca.
Although the human race must be regarded as a unit intellectually and physically, from the anthropologists' viewpoint the particular set of bones most often measured for purposes of racial classification are those of the head. The aim of the present work was to determine some relevant cephalofacial parameters, particularly in relation to sex and to study the distribution of basic head and face types of a Kosova Albanian population. The study sample comprised 754 subjects of both sex (561 male and 193 female) aged 18 to 35 from Kosova. Five basic cephalofacial variables were measured to obtain the head and face indexes. Statistically significant differences between two treated groups, according to sex, were found almost in all measured cephalofacial...
Tipo: Journal article
Palavras-chave: Anthropological; Cephalofacial; Facial index; Cephalic index.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400024

Cephalometric Evaluation of the Airway Space and Hyoid Bone in Children with Atypical Deglutition: Correlations Study
Provedor de dados: 77
Autores: Machado Júnior,Almiro J; Crespo,Agrício N.
Although there is a close relationship between swallowing and breathing are no studies that relate to atypical swallowing radiographic anatomy of the airway space and its possible correlation with the radiographic position of the hyoid bone. The aim was to evaluate the possible correlation with the radiographic position of the hyoid bone and airway space in lateral radiographs of children with atypical deglutition. Using cephalometric analysis on lateral teleradiographs, the distances of H-MP (hyoid to mandibular plane) and H-T (hyoid to tuber) were Spearman's correlation analysis was performed with PAS (airway space) in two groups: the experimental group with atypical deglutition and the control group normal deglutition. Both groups included subjects in...
Tipo: Journal article
Palavras-chave: Cephalometry; Atypical deglutition; Oropharyngeal space.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100060

Cephalometry in 14-18 Years Old Girls and Boys of Shiraz-Iran High School
Provedor de dados: 77
Autores: Vojdani,Zahra; Bahmanpour,Soghra; Momeni,Shahla; Vasaghi,Atieh; Yazdizadeh,Azadeh; Karamifar,Amirali; Najafifar,Amirhosseine; Setoodehmaram,Shahram; Mokhtar,Ali.
Cephalometry or skull measurement are used in pediatrics, forensic medicine, plastic surgery, oral surgery and diagnostic comprehension between patient and normal populations. Cephalic index is an important parameter for detecting the race and sex of an individual whose identity is unknown. The most important of cephalometric dimension are height and width of head which determine cephalic index. On the basis of cephalic index four head shapes are determined in international categories, that including dolichocephal, brachycephal, mesocephal and hyperbrachycephal. With noticing the lack of documented research about 14-18 years old girls and boys in this area, this study was planned for determining normal range of head shapes in 867girls and 960 boys in the...
Tipo: Journal article
Palavras-chave: Cephalometry; Cephalic index; Student.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100018

Cerebellar Vermis: Topography and Variations
Provedor de dados: 77
Autores: Bispo,Rodrigo Freitas Monte; Ramalho,Antonio José Casado; Gusmão,Luiz Carlos Buarque de; Cavalcante,Amundson Portela  de Holanda; Rocha,Amauri Clemente da; Sousa-Rodrigues,Célio Fernando de.
The vermis is described as the unpaired, median portion of the cerebellum to which the hemispheres are attached. Both the vermis and the hemispheres are formed by folia that, grouped together, are called lobules. The material analyzed consisted of a sample made up of 43 adult male cerebella fixed in 10% formaldehyde and sliced medially. The lingula was attached to the superior medullary velum in 100% (43) of the cerebella, varying only in size. In 80% (32) of the cerebella, the central lobe contained one folium; 7.5% (3) had two folia with the first larger than the second; 10% (4) had two folia with the second larger than the first; and 2.5% (1) had two folia of equal size. In 5% (2) of the cerebella, the folium of the vermis emerged from the declive; in...
Tipo: Journal article
Palavras-chave: Cerebellum; Vermis; Variation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200018

CHAETANTHERA ACHENO-HIRSUTA (TOMBESI) ARROYO, A.M.R.DAVIES &amp;amp; TILL-BOTTRAUD ELEVATED TO SPECIES, NEW FOR THE FLORA OF CHILE
Provedor de dados: 73
Autores: Arroyo,Mary T.K.; Davies,Alison M.R.; Till-Bottraud,Irène.
Chaetanthera acheno-hirsuta (Tombesi) Arroyo, A.M.R. Davies &amp;amp; Till-Bottraud (Asteraceae: Mutisieae), previously known from the upper limits of the vegetation (&gt;3900m) on the eastern side of the Andes in San Juan Province, Argentina, is cited for Chile from six collections made in the Andes of the III Region (Atacama Region) between 3500-4000 m. The new record for the flora of Chile is based on Chaetanthera pulvinata (Phil.) Hauman var. acheno-hirsuta Tombesi, here elevated to species. Chaetanthera acheno-hirsuta belongs to Chaetanthera subgenus Egania. Its closest relatives, based on morphological characteristics, are C. apiculata (J. Remy) Benth. &amp;amp; Hook.f. and C. acerosa (J. Remy) Benth. &amp;amp; Hook.f. It is distinguished from C....
Tipo: Journal article
Palavras-chave: Chaetanthera pulvinata; Flora of Chile; New combination; New record.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000100004

Chaetauchenium Tschitchérine, 1900 (Carabidae: Pterostichini) a new species and new status for a lineage from the Valdivian temperate rainforest
Provedor de dados: 72
Autores: Will,Kipling.
A new species Chaetauchenium loki, is described from Parque Oncol in Chile. This species, C. convexipennis (Fairmaire) and Parhypates (Antarctobium) magellanicum (Fairmaire) share a combination of features distinct from all other species attributed to Parhypates and from all other species of South American Pterostichini. To reflect this, Chaetauchenium is elevated as a distinct genus and Antarctobium is considered congeneric. Individuals of these species have highly variable and unusual patterns of supernumerary or reduced numbers of setae and variation in secondary sexual characters. Males have denticulate and falciform aedeagal parameres and females have a digitiform diverticula at the base of the spermatheca. These genital and reproductive tract...
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200009

Chagas disease: Present status of pathogenic mechanisms and chemotherapy
Provedor de dados: 48
Autores: Maya,Juan Diego; Orellana,Myriam; Ferreira,Jorge; Kemmerling,Ulrike; López-Muñoz,Rodrigo; Morello,Antonio.
There are approximately 7.8 million people in Latin America, including Chile, who suffer from Chagas disease and another 28 million who are at risk of contracting it. Chagas is caused by the flagellate protozoan Trypanosoma cruzi. It is a chronic disease, where 20%-30% of infected individuals develop severe cardiopathy, with heart failure and potentially fatal arrhythmias. Currently, Chagas disease treatment is more effective in the acute phase, but does not always produce complete parasite eradication during indeterminate and chronic phases. At present, only nifurtimox or benznidazole have been proven to be superior to new drugs being tested. Therefore, it is necessary to find alternative approaches to treatment of chronic Chagas. The current treatment...
Tipo: Journal article
Palavras-chave: Chagas disease; Chemotherapy; Nifurtimox; Trypanosoma cruzi; Prostaglandins.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300009

CHANGED PATTERNS OF REMOTELY SENSED CHLOROPHYLL A IN THE ADRIATIC-INFLUENCE OF METEOROLOGICAL CONDITIONS
Provedor de dados: 72
Autores: Morovic,Mira; Grbec,Branka; Marasovic,Ivona.
The patterns of spatial distribution of pigment concentrations in the Adriatic Sea were studied using remotely sensed data from the CZCS (1978-1986), SeaWiFS data from 1997-2000 and 2003, Color POLDER (CNES) data for 1997, and some other data. In the earlier investigations, open waters of the Middle and especially the Southern Adriatic were considered almost oligotrophic regions. Although the pollution-induced changes were reflected from time to time in the whole Adriatic, the southern portion seemed to remain the least productive. Contrary to this, the recent evidence was found for the increased productivity of this southern region in some periods. The patterns of pigment distribution were the result of the meteorological forcing, which influenced...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300017

Changes in Body Composition After 6 Months of Training in Pubertal Swimmers
Provedor de dados: 77
Autores: Rodrigues-Ferreira,Mário A; VencesBrito,António M; Mendes,João; Fernandes,Renato; Fernando,Catarina.
This study assessed the differences in body composition after 6 months of training in pubertal boys and girl swimmers and in pubertal boys and girls without sport practice. The swimming group was composed of 20 pubertal swimmers: 10 boys (SB) (age: 13.5±1.5 years; Tanner stage: 3.6±0.5) and 10 girls (SG) (age: 11.3±0.7 years; Tanner stage: 3.4±0.5), with an average training experience of 4±1.3 and 3±0.5 years, respectively. The control group was composed of 20 pubertal participants without sport practice: 10 boys (CB) (age: 13.6±1.2 years; Tanner stage: 3.5±0.5) and 10 girls (CG) (age: 11.2±0.8 years; Tanner stage: 3.5±0.5). The following anthropometric measurements were carried out in two assessment periods (pre- and post-test): height, weight and...
Tipo: Journal article
Palavras-chave: Morphology; Body composition; Pubertal athletes; Swimming.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100055

Changes in Morphological Characteristics During the Period 2005 ­ 2014 in a Sample of Serbian 7 - Year-Old Children
Provedor de dados: 77
Autores: Pavlica,Tatjana; Rakic,Rada; Sironjic,Tijana.
Morphological characteristics of children commonly imply the processes of growth and development. Information on children's growth in height and their body weight is often used as the indicator of the children's health and nutritional status. As the parameters are changeable both temporally and spatially, it is important to provide their continual assessment. The aim of the study is to investigate the changes in morphological characteristics in a sample of Serbian 7-year-old children in the period 2005 ­ 2014. The data was gathered from medical documentation recorded in the period 2005-2014 in the local health-care centre "Dr Dusan Savic­ Doda" in Beocin, which is situated in the central part of the province Vojvodina, the north-west part of Serbia. Most...
Tipo: Journal article
Palavras-chave: Height; Weight; BMI; Secular trend; Serbia.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200049

Changes in Morphology of Alveolar Buccal Walls Following Atraumatic Internal Root Fragmentation
Provedor de dados: 77
Autores: Engelke,Wilfried; Beltrán,Víctor; Decco,Oscar; Valdivia-Gandur,Iván; Navarro,Pablo; Fuentes,Ramón.
The buccal alveolar wall represents the most important structure to provide shape and volume of the alveolous following tooth extraction. The aim of the study was the evaluation of buccal alveolar bone structures following minimally invasive surgery. In 15 patients (3 male, 12 female), aged 20­67 years, 3 central incisors, 5 lateral incisors, and 7 bicuspids were removed using flapless enucleation. The enucleation comprised endoscopically assisted mesiodistal root sectioning with inward fragmentation of the oral and apical parts followed by internal reduction of the buccal root lamella. Buccal bone height before extraction was 10.61 mm, following extraction 10.50 mm. Crestal width of the buccal bone plate was 1.11 mm before and 1.40 mm after tooth removal....
Tipo: Journal article
Palavras-chave: Extraction socket; Buccal plate; Endoscopes; Microsurgical removal; Enucleation.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200014

Changes in morpho-physiological attributes of Eucalyptus globulus plants in response to different drought hardening treatments
Provedor de dados: 69
Autores: Coopman,Rafael E; Jara,Jorge C; Bravo,Leon A; Sáez,Katia L; Mella,Gloria R; Escobar,Rene.
Morpho-physiological attributes exhibited in response to drought hardening at the end of the growing season of Eucalyptus globulus Labill under nursery conditions were studied to evaluate the effect of three drought hardening treatments in morpho-physiological traits used as suitable indicators of drought hardiness, such as, plant growth, root growth potential, plant water relationships and survival. Freezing resistance of drought hardened plants was also studied in order to evaluate cross hardening effects in cuttings of Eucalyptus globulus Labill. Drought hardening consisted in induced water stress by watering restriction, until plant stem xylem water potentials (&amp;#936;pd) reached to-0.2, -1.3 and -2.4 MPa. Two water stress-rewatering cycles were...
Tipo: Journal article
Palavras-chave: Freezing resistance; Root growth potential; Stem xylem water potential; Water stress; Water relationships.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200005

Changes in PEP Carboxylase, Rubisco and Rubisco activase mRNA levels from maize (Zea mays) exposed to a chronic ozone stress
Provedor de dados: 48
Autores: LEITAO,LOUIS; MAORET,JEAN-JOSÉ; BIOLLEY,JEAN-PHILIPPE.
We quantified the ozone impact on levels of Zea mays L. cv. Chambord mRNAs encoding C4-phosphoenolpyruvate carboxylase (C4-PEPc), ribulose-l,5-bisphosphate carboxylase/oxygenase small and large subunits (Rubisco-SSU and Rubisco-LSU, respectively) and Rubisco activase (RCA) using real-time RT-PCR. Foliar pigment content, PEPc and Rubisco protein amounts were simultaneously determined. Two experiments were performed to study the ozone response of the 5th and the 10th leaf. For each experiment, three ozone concentrations were tested in open-top chambers: non-filtered air (NF, control) and non-filtered air containing 40 (+40) and 80 nL L-1 (+80) ozone. Regarding the 5th leaf, +40 atmosphere induced a loss in pigmentation, PEPc and Rubisco activase mRNAs....
Tipo: Journal article
Palavras-chave: Carboxylase; Maize; MRNA; Ozone; Rubisco activase.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000200005

CHANGES IN PHYSICAL PROPERTIES OF A TYPIC HAPLOCAMBID BY ANNUAL CROP CULTURE
Provedor de dados: 126
Autores: Seguel,O; Baginsky,C; Contreras,A; Covarrubias,J; Gonzalez,C; Sandoval,M.
As an alternative to organic soil amendments used in the Copiapo Valley (northern Chile), this study analyzed the magnitude of changes in physical soil properties associated with different crop rotations on the rows on a grape orchard. The study was performed in the locality of Los Loros, Atacama Region, during the 2006-2008 seasons. In a Typic Haplocambid soil (2-5% slope, coarse loam) with a 6-year old grape plantation, a control and three crop rotations were established, each with four replicates. Soil samples were taken at three depths (0-10; 10-40; 40-60 cm), evaluating bulk density, penetration resistance, aggregate stability, pore size distribution and air and water flux. Crop rotation did not produce statistical differences in soil density compared...
Tipo: Journal article
Palavras-chave: Porosity; Aggregate stability; Mechanical strength; Productivity.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000100001

Changes in tree species richness, stand structure and soil properties in a successional chronosequence in northern Chiloé Island, Chile
Provedor de dados: 97
Autores: ARAVENA,JUAN C.; CARMONA,MARTÍN R.; PÉREZ,CECILIA A.; ARMESTO,JUAN J.
We studied a chronosequence of forest fragments in northern Chiloé Island, southern Chile, with the aim of assessing ecosystem recovery patterns following anthropogenic disturbance. Hypotheses regarding successional trends in tree species richness, the replacement of shade-intolerant by shade-tolerant species, and the impact of disturbance on soil properties were evaluated in nine forest stands. The chronosequence encompassed two early (minimum stand age &lt;15 years), three mid-successional (30-60 years), three late-successional (129-134 years), and one old-growth stand (ca. 200 years). Stand ages were estimated by coring a minimum of 30 canopy trees in each stand. Early and mid-successional stands showed evidence of human disturbance by fire of moderate...
Tipo: Journal article
Palavras-chave: Forest succession; Fire disturbance; Biodiversity; Shade tolerance; Forest dynamics.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000200007

Changes in wing length in the pollinator Bombus dahlbomii occurring with the fragmentation of the Maulino forest, Chile
Provedor de dados: 118
Autores: Murúa,Maureen M; Grez,Audrey A; Simonetti,Javier A.
Habitat fragmentation can affect the morphological design of flying insects in different ways through changes in the costs and benefits of dispersal patterns. Larger wings should be favored if necessary resources are scattered across a fragmented landscape. The purpose of this research is to test this prediction in Bombus dahlbomii (Guérin), a native Chilean pollinator associated with the fragmented Maulino forest. We used hanging traps to collect individuals in the continuous native forest, in four small forest remnants and in two Pinus radiata plantations (matrix). We measured the body size (mm) and the length of the first and the second pairs of wings (mm) of each individual collected. In all, 280 individuals were captured. The body size and the length...
Tipo: Journal article
Palavras-chave: Bumblebees; Habitat fragmentati morphometric changes.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300008

Changes of sub-fossil chironomid assemblages associated with volcanic sediment deposition in an Andean lake (38°S), Chile
Provedor de dados: 97
Autores: ARANEDA,ALBERTO; CRUCES,FABIOLA; TORRES,LAURA; BERTRAND,SEBASTIEN; FAGEL,NATHALIE; TREUTLER,HANS C; CHIRINOS,LUIS; BARRA,RICARDO; URRUTIA,ROBERTO.
Chironomid assemblages and sedimentological parameters (grain size, organic content, mineralogy) of a short sediment core from Lake Galletué (38°41' S, 71°17' W) were analysed. The sedimentary record includes one volcanic ash (tephra) layer, which has a completely different composition than the host sediment in terms of organic content, grain size, and mineralogy. According to the geochronology (210Pb and 137Cs), this ash layer corresponds to the eruption of Llaima Volcano in 1956-1957. The tephra deposition had an impact on chironomid assemblages producing, among other changes, an increase in Parakiefferiella and a decrease in Ablabesmyia, although no noticeable change was detected in the diversity index. When compared with other studies, our results also...
Tipo: Journal article
Palavras-chave: Chironomids; Lake sediments; Tephra layer; Southern Chile.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200002

Changes to the benthic assemblage associated with mollusc and seaweed cultivation in the Quempillén estuary, north patagonia, Chile
Provedor de dados: 72
Autores: Encalada,Elizabeth; Bertrán,Carlos; Vargas-Chacoff,Luis.
The main aquaculture activities in the Quempillen estuary involve cultures of oysters, Ostrea chilensis and algae Gracilaria chilensis. Anthropogenic intervention inside the estuary generates significant changes in sediments and organic matter content.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200009

Characteristics of banana fruits (Musa spp. AAA, cv. Nanica) treated with cytokinin and gibberellin
Provedor de dados: 118
Autores: Lima,Juliana D; Santa Rosa,Jéssica; Gomes,Eduardo N; Rozane,Danilo E; Modenese-Gorla da Silva,Silvia H.
The aim of this study was to analyze the effect of cytokinin and gibberellin on the characteristics of banana fruits (Musa spp. AAA, cv. Nanica) as a function of the formation period and position in the bunch. A completely randomized, 2x5 factorial design was adopted consisting of two bunch development periods (summer and winter) and five treatments as well as the same arrangement in a split plot with the 2×5 factorial arrangement as the plot and the position of the hand in the bunch (basal, middle and apical) as the subplot. Treatments consisted of spraying twice with either water, 150 mg L-1 of kinetin, 200 mg L-1 of gibberellic acid, 100 mg L-1 of kinetin plus 200 mg L-1 of gibberellic acid or 200 mgL-1 of kinetin plus 200 mg L-1 of gibberellic acid,...
Tipo: Journal article
Palavras-chave: Growth regulators; Intra-bunch variability; Source-sink relationship.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200005

Characteristics of the Gustatory Organs on the Tongue of the Chinese Fire-bellied Newt (Cynops orientalis): Light and Scanning Electron Microscopy Study
Provedor de dados: 77
Autores: Xie,Zhaohui; Li,Jingting; Cheng,Pu.
The dorsal surface of the tongue gustatory organs of Chinese fire-bellied newt (Cynops orientalis) was observed by employing the light and scanning electron microscopy (SEM) techniques. The results revealed that the rostral and median part of the tongue presents a round apex and covered by taste disks (TDs). They are usually roundish or ellipsoidal in shape and are 20-35 mm in diameter. The many openings of the lingual glands are 4-8 mm in diameter exist in the lateral border or median part of lingual body. The gustatory organs on the tongue did not differed form those presented in other species in Caudates. These may indicate the functions of gustatory organs on the tongue related to their life habit.
Tipo: Journal article
Palavras-chave: Tongue; Lingual epithelium; Histology; Taste disks; Caudates.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300030

Characterization and comparability of biosimilars: A filgrastim case of study and regulatory perspectives for Latin America
Provedor de dados: 69
Autores: Mendoza-Macedo,Karina; Romero-Díaz,Alexis J; Miranda-Hernández,Mariana P; Campos-García,Víctor R; Ramírez-Ibañez,Nancy D; Juárez-Bayardo,L. Carmina; Moreno-Duran,Karen; Cedillo-Robles,Miriam S; Pérez,Nestor O; Jung-Cook,Helgi; Flores-Ortiz,Luis F; Medina-Rivero,Emilio.
Background: Developing countries have an estimate of ten times more approved biosimilars than developed countries. This disparity demands the need of an objective regulation that incorporates health policies according to the technological and economical capabilities of each country. One of the challenges lies on the establishment of comparability principles based on a physicochemical and biological characterization that should determine the extent of additional non-clinical and clinical studies. This is particularly relevant for licensed biosimilars in developing countries, which have an extensive clinical experience since their approval as generics' in some cases more than a decade. To exemplify the current status of biosimilars in Mexico' a...
Tipo: Journal article
Palavras-chave: Bio therapeutic; Comparability; Critical quality attributes; Developing countries; Generics; Health policies; High quality biosimilars; Regulation.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600010

Characterization and evaluation of coconut aroma produced by Trichoderma viride EMCC-107 in solid state fermentation on sugarcane bagasse
Provedor de dados: 69
Autores: Fadel,Hoda Hanem Mohamed; Mahmoud,Manal Gomaa; Asker,Mohsen Mohamed Selim; Lotfy,Shereen Nazeh.
Background Sugarcane bagasse was shown to be an adequate substrate for the growth and aroma production by Trichoderma species. In the present work the ability of Trichoderma viride EMCC-107 to produce high yield of coconut aroma in solid state fermentation (SSF) by using sugarcane bagasse as solid substrate was evaluated. The produced aroma was characterized. Results Total carbohydrates comprised the highest content (43.9% w/w) compared with the other constituents in sugarcane bagasse. The sensory and gas chromatography-mass spectrometric (GC-MS) analysis revealed that the highest odor intensity and maximum yield of volatiles were perceived at the 5th d of induction period. The unsaturated lactone, 6-pentyl-&amp;#945;-pyrone (6-PP), was the major...
Tipo: Journal article
Palavras-chave: 6-Pentyl-&amp;#945; -pyrone Gas chromatography-mass spectrometry Industrial waste.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100002

Characterization and mapping of an informational suppressor in Aspergillus nidulans
Provedor de dados: 48
Autores: GRACITE DE MELO FRANZONI,MELISSA; ALVES DE CASTRO-PRADO,MARIALBA AVEZUM.
The present work was undertaken to characterize a suppressor gene present in a mutant strain of A. nidulans obtained with NTG (N-Methyl-N'-Nitro-N-Nitrosoguanidine). Analyses of this mutant have shown that this suppressor, designated suO1, induces phenotypic co-reversion of several auxotrophic mutations and makes the strain sensitive to aminoglycoside antibiotics and lower temperatures. suO1 has shown to be on linkage group VIII. The vegetative growth of the mutant strain is very unstable because the suppressor gene induces the production of prototrophic mitotic sectors. The strains bearing the suO1 gene produce cleistothecia containing a reduced number of viable ascospores during the sexual cycle. The segregation of the genetic markers has also been...
Tipo: Journal article
Palavras-chave: Aspergillus nidulans; Barren cleistothecia; Informational suppressor; Paromomycin.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000100008

Characterization and properties of the biosurfactant produced by Candida lipolytica UCP 0988
Provedor de dados: 69
Autores: Diniz Rufino,Raquel; Moura de Luna,Juliana; de Campos Takaki,Galba Maria; Asfora Sarubbo,Leonie.
Background: Biotechnological processes are costly, especially for the production of biosurfactants. The successful production of a biosurfactant is dependent on the development of processes using low cost raw materials. Considering the importance of the characteristics of a biosurfactant to facilitate its industrial application, the properties of the biosurfactant produced by Candida lipolytica through previously optimized medium have been established. Results: The yeast was grown for 72 h to determine the kinetics of growth and production. The surface tension of the cell-free broth was reduced from 55 to 25 mN/m. The yield of biosurfactant was 8.0 g/l with a CMC of 0.03%. The biosurfactant was characterized as an anionic lipopeptide composed of 50%...
Tipo: Journal article
Palavras-chave: Biosurfactant; Candida lipolytica; Lipopeptide; Surface tension; Toxicity.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100006

Characterization and variability of the prokaryotic community in sediments from Salar de Lagunilla, Northern Chile
Provedor de dados: 72
Autores: Medina Armijo,Cristy A.; Moraga Mamani,Ruben.
ABSTRACT Fluorescence in situ hybridization (FISH) with rRNA-targeted oligonucleotide probes was used to investigate the abundance of prokariotic community from the sediments of different sites and along a temporary-space scale from Salar de Lagunilla, a high-altitude athalassohaline wetland in the Chilean Altiplano. Six different taxonomic groups were studied: alpha, beta, gamma proteobacterias, sulfate-reducing of the delta subclass of Proteobacteria, Cytophaga-flavobacteria and the domain Archaea. The analyses showed the Archaea domain and Cytophaga-flavobacteria group (33.6 % - 20.2 %, respectively) as the dominant group, whereas the groups with minor abundance corresponded to alpha and Beta-proteobacteria (10.7-15.5 %). The prokariotic communities in...
Tipo: Journal article
Palavras-chave: Fluorescence in situ hybridization; Salt flats; Andean Altiplano.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200181

Characterization by PCR of Vibrio parahaemolyticus isolates collected during the 1997-1998 Chilean outbreak
Provedor de dados: 48
Autores: CÓRDOVA,JOSÉ LUIS; ASTORGA,JOSEFA; SILVA,WALLY; RIQUELME,CARLOS.
Between November 1997 and April 1998, several human gastroenteritis cases were reported in Antofagasta, a city in the north of Chile. This outbreak was associated with the consumption of shellfish, and the etiologic agent responsible was identified as Vibrio parahaemolyticus. This was the first report of this bacterium causing an epidemic in Chile. V. parahaemolyticus was the only pathogenic bacterium isolated from patient stools and from shellfish samples. These isolates were analyzed by polymerase chain reaction (PCR) amplification of the pR72H gene, a species-specific sequence. Based on the pR72H gene amplification pattern, at least three different isolates of V. parahaemolyticus were found. Two isolates (named amplicons A and C) generated PCR products...
Tipo: Journal article
Palavras-chave: Bacterial bloom; Bacterial geographical dispersion; PCR amplification; Molecular typification.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000300017

Characterization of a Gelatin/Chitosan/Hyaluronan scaffold-polymer
Provedor de dados: 69
Autores: Enrione,Javier; Osorio,Fernando; López,Daniel; Weinstein-Oppenheimer,Caroline; Fuentes,Miguel A; Ceriani,Ricardo; Brown,Donald I; Albornoz,Fernando; Sánchez,Elizabeth; Villalobos,Patricio; Somoza,Rodrigo A; Young,Manuel E; Acevedo,Cristian A.
Gelatin, chitosan and hyaluronic acid are natural components used to prepare polymeric scaffold in tissue engineering. The physical properties of these materials confer an appropriate microenvironment for cells, which can be used as a regeneration system for skin and cartilage. In this work, we prepared and characterized a Gelatin/Chitosan/Hyaluronan lyophilized-polymer. Physical properties of lyophilized-polymer changed slightly with moisture, but when polymer was totally hydrated the elasticity changed significantly. Thermophysical characterisation indicated that temperatures higher than 30ºC could modify irreversibly the polymeric matrix probably due to protein denaturation. Besides, we used the polymer as scaffold to prepare a biosynthetic-skin,...
Tipo: Journal article
Palavras-chave: Chitosan; Fibrin; Gelatin; Hyaluronic acid; Scaffold.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500020

Characterization of a multi-tolerant tannin acyl hydrolase II from Aspergillus carbonarius produced under solid-state fermentation
Provedor de dados: 69
Autores: Valera,Larissa Serrani; Jorge,João Atílio; Guimarães,Luis Henrique Souza.
Background Tannases are enzymes with biotechnological potential produced mainly by microorganisms as filamentous fungi. In this context, the production and characterization of a multi-tolerant tannase from Aspergillus carbonarius is described. Results The filamentous fungus A. carbonarius produced high levels of tannase when cultivated under solid-state fermentation using green tea leaves as substrate/carbon source and tap water at a 1:1 ratio as the moisture agent for 72 h at 30°C. Two tannase activity peaks were obtained during the purification step using DEAE-Cellulose. The second peak (peak II) was purified 11-fold with 14% recovery from a Sepharose CL-6B chromatographic column. The tannase from peak II (tannase II) was characterized as a heterodimeric...
Tipo: Journal article
Palavras-chave: Aspergillus; Microbial enzymes; Solid-state fermentation; Tannase; Tannic acid.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600013

Characterization of a thermostable extracellular tannase produced under submerged fermentation by Aspergillus ochraceus
Provedor de dados: 69
Autores: Gonçalves,Heloísa Bressan; Riul,Alana Jacomini; Quiapim,Andréa Carla; Jorge,João Atílio; Guimarães,Luis Henrique Souza.
Background: Tannases are enzymes that may be used in different industrial sectors as, for example, food and pharmaceutical. They are obtained mainly from microorganisms, as filamentous fungi. However, the diversity of fungi stays poorly explored for tannase production. In this article, Aspergillus ochraceus is presented as a new source of tannase with interesting features for biotechnological applications. Results: Extracellular tannase production was induced when the fungus was cultured in Khanna medium with tannic acid as carbon source. The extracellular tannase was purified 9-fold with 2% recovery and a single band corresponding to 85 kDa was observed in SDS-PAGE. The native apparent molecular mass was estimated as 112 kDa. Optima of temperature and pH...
Tipo: Journal article
Palavras-chave: Aspergillus ochraceus; Gallic acid; Tannase; Tannic acid; Tannin acyl hydrolase.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500004

Characterization of Anatomical, Chemical, and Biodegradable Properties of Fibers from Corn, Wheat, and Rice Residues
Provedor de dados: 117
Autores: Garay M,Rose Marie; Rallo de la B,Mónica; Carmona C,René; Araya C,Jaime.
Anatomical, chemical, and biodegradation properties of fibers from wheat (Triticum aestivum L.), rice (Oryza sativa L.), and corn (Zea mays L.) plant residues and from rice hull were characterized to generate scientific and technical knowledge to support decision making regarding their use. The anatomical and chemical properties were determined following standard procedures. The degree of biodeterioration was analyzed from growth of white rot fungus Pleurotus ostreatus (Jaq.) Quél. in 30 d under favorable conditions. Afterwards, weight loss was evaluated for each residue. Three replicates were used, plus a control of radiata pine (Pinus radiata D. Don) woodchips. The greatest proportion of a-cellulose was found in residues of rice plants (45.1%), with a...
Tipo: Journal article
Palavras-chave: Agriculture fibers; Biodeterioration; Crop residues; White rot.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300014

Characterization of Blood Mononuclear Phagocytes in Phrynops hilarii (Chelonia Chelidae)
Provedor de dados: 77
Autores: Pitol,Dimitrius Leonardo; Issa,Joáo Paulo Mardegan; Caetano,Flávio Henrique; Lunardi,Laurelúcia Orive.
The localization of peroxidase activity in different cell regions is used as a criterion for the classification of the stage of maturation of mammalian mononuclear phagocytes with a positive peroxidase reaction indicating the presence of monoblasts, promonocytes, monocytes and macrophages. In this study it was evaluated the peroxidase activity of blood mononuclear phagocytes of this turtle detected at different stages of differentiation. The present observations suggest that, in turtles, the differentiation of mononuclear phagocytes occur in the blood circulation, in contrast to animals, where only are monocytes in circulating blood and macrophage differentiation occurs in other body compartments
Tipo: Journal article
Palavras-chave: Mononuclear phagocytes; Blood; Turtle.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200021

Characterization of Calreticulin Expression in Mouse Endometrium during Embryo Implantation
Provedor de dados: 48
Autores: CHENG,SHU-QUN; HE,JUN-LIN; DONG,YAN-LING; LIU,XUE-QING; DING,YU-BIN; GAO,RU-FEI; TAN,YI; YE,QIAN; TIAN,ZHEN-LING; WANG,YING-XIONG.
Calreticulin (CRT), a Ca2+-binding storage protein and chaperone in the endoplasmic reticulum, modulates cell adhesiveness and integrin-dependent Ca2+ signaling. However, the role of CRT during implantation remains poorly understood. In the present study, we characterized the expression of CRT mRNA and the protein in mouse endometria from pregnancy DI to D7. Real-Time PCR and in situ hybridization results showed that the levels of CRT mRNA in the endometria of pregnant mice were significantly higher than those of non-pregnant mice (P&lt;0.05), and increased gradually from pregnancy DI to D4, reaching the máximum level on D4, followed by a plateau from D4 to D7. Using immunofluorescence histochemistry and western blot, changes of CRT expression in the...
Tipo: Journal article
Palavras-chave: Calreticulin; Endometrium; Embryo implantation; Mouse.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000400012

Characterization of cellulolytic activities of Bjerkandera adusta and Pycnoporus sanguineus on solid wheat straw medium
Provedor de dados: 69
Autores: Quiroz-Castañeda,Rosa E; Balcázar-López,Edgar; Dantán-González,Edgar; Martinez,Alfredo; Folch-Mallol,Jorge; Martínez Anaya,Claudia.
Cellulolytic properties of two white rot fungi, Bjerkandera adusta and Pycnoporus sanguineus, cultivated on wheat straw agar medium, were characterized and compared. Optimal growing parameters for maximum enzyme production for both fungi were wheat straw medium pH 5 and 28ºC. B. adusta showed, on the 6th day of culture, carboxymethylcellulose (CMC)ase activity levels 1.6 times higher than maximal P. sanguineus activity, achieved on the 8th day. B. adusta supernatants also displayed higher activity levels towards xylan (3.6-fold) compared to those of P. sanguineus. However, enzymes from P. sanguineus were more robust resisting one hour incubation at high temperatures (up to 80ºC), and exhibiting activity and stability in pH range from 2 to 8. Cellulolytic...
Tipo: Journal article
Palavras-chave: B. adusta; Cellulases; P. sanguineus; Wheat straw; Xylanases.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400005

Characterization of cheese consumers in Santiago Province, Chile
Provedor de dados: 118
Autores: Vargas-Bello-Pérez,Einar; Aguilar,Claudio; Toro-Mujica,Paula; Vera,Raúl R; Cerda,Matías; Briones,Ignacio.
A high demand for Chilean cheese has resulted in increased cheese production. This increase represents an opportunity to promote the development of new markets, such as for small ruminant cheeses. However, little has been discussed regarding the extent to which cheese consumers consider small ruminant cheeses. We hypothesized that price is the main determining factor for purchasing cheese. The present study examined this previously unexplored aspect. The objective of this study was to identify the factors that contribute to the purchaser's response behavior, including purchase, usage and product possession. This study also aimed to provide preliminary information on cheese consumption in the Province of Santiago, Chile. A personal interview was conducted...
Tipo: Journal article
Palavras-chave: Cheese; Consumption; Small ruminant.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000300005

Characterization of Dairy Slurry in Sourthern Chile Farms
Provedor de dados: 113
Autores: Salazar,Francisco; Dumont,Juan Carlos; Chadwick,David; Saldaña,Rodolfo; Santana,Mabel.
In this study 50 slurry samples were collected from commercial dairy farms located in the South of Chile during 1995-1997. Samples were analyzed for dry matter, pH, organic matter, available and total macro nutrients (nitrogen, phosphorus, potassium, calcium, magnesium and sodium), available and total micro nutrients (zinc, iron, manganese and copper) and total aluminum. Results showed that the dry matter content in dairy effluents was low, with 62% of the samples being &lt; 4% DM. This reflected the large volumes of water that the storage received. A great variation in nutrient content was observed in the analyzed samples, probably reflecting differences in feeding regimes, use of wash water, rainfall and age of slurry at the time of sampling. In general,...
Tipo: Journal article
Palavras-chave: Nutrients; Dairy effluents; Cattle slurry; Farm waste.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000200005

Characterization of Dunaliella salina strains by flow cytometry: a new approach to select carotenoid hyperproducing strains
Provedor de dados: 69
Autores: Mendoza,Héctor; de la Jara,Adelina; Freijanes,Karen; Carmona,Laura; Ramos,Ana Alexandra; de Sousa Duarte,Vanessa; Serafim Varela,João Carlos.
In the present work the characterization of different strains of Dunaliella salina from established cell culture collections and various isolates from solar saltworks located in the Canary Island, as well as one mutant, was carried out in order to assess the existence of intraspecific differences and to determine the potential productivity of each one. Morphological characteristics such as cellular size and cellular complexity and parameters linked to cellular physiology, such as pigment content or cellular growth rate, were determined by means of traditional techniques as well as flow cytometry. Results showed a high morphological and physiological intraspecific variability among the studied strains. Results suggest that the application of the lipidic dye...
Tipo: Journal article
Palavras-chave: Carotene; Carotenogenesis; Dunaliella salina; Flow cytometry; Nile red.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400005

Characterization of Escherichia coli virulence genes, pathotypes and antibiotic resistance properties in diarrheic calves in Iran
Provedor de dados: 48
Autores: Shahrani,Masoud; Dehkordi,Farhad Safarpoor; Momtaz,Hassan.
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Tipo: Journal article
Palavras-chave: Antibiotic resistance profile; Diarrheic calves; Escherichia coli; Iran; Serogroups; Virulence genes.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100028

Characterization of extracellular cellulose-degrading enzymes from Bacillus thuringiensis strains
Provedor de dados: 69
Autores: Lin,Ling; Kan,Xianzhao; Yan,Hao; Wang,Danni.
The gram-positive spore-forming bacteria, Bacillus thuringiensis (Bt) strains produced novel cellulases which could liberate glucose from soluble cellulose, carboxymethyl cellulose (CMC), and insoluble crystalline cellulose. The maximal cellulase activities were obtained after 60 hrs incubation at 28ºC in a LB broth medium with 1% CMC. Maximum CMCase activities were got at 40ºC and pH 4.0, respectively, and more than 50% of its maximal activity was retained at 40-60ºC for 1 hr, while approximately 40% of its maximal activity was also retained after incubating at 70ºC for 1 hr. Most metal ions and reagents such as Ca2+, Mg2+, Cd2+, Pb2+, Zn2+, Cu2+, EDTA, and SDS inhibited the enzyme activities, but K+ and Mn2+ activated the activities. The enzymes from...
Tipo: Journal article
Palavras-chave: Bacillus thuringiensis; Cellulase; Cellulose-degrading; Characterization.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300002

Characterization of genetic coefficients of durum wheat (Triticum turgidumL. ssp. durum)'Llareta-INIA' and 'Corcolén-INIA'
Provedor de dados: 117
Autores: Garrido,Marco; Román,Luis; Silva,Paola; Castellaro,Giorgio; García de Cortázar,Víctor; Acevedo,Edmundo.
The genetic coefficients, representative of a crop, are necessary to use growth models; in many cases the range of the species is known, but there are no specific values for varieties. Durum wheat (Triticum turgidumL. ssp. durum)'Llareta-INIA' and 'Corcolén-INIA' were sown under irrigation in the experiment station Antumapu of the Universidad de Chile on 29 June 2007, 19 May 2009, and 15 June 2010 in order to determinate four genetic coefficients: developmental thermal time, phyllochron (PHLN), extinction coefficient (k), and radiation use efficiency (RUE), and to evaluate the performance of these coefficients. Thermal times to anthesis and from anthesis to physiological maturity were 652 and 541 °C d, respectively. Two PHLN values were found, 46.6 °C d...
Tipo: Journal article
Palavras-chave: Simulation; Thermal time; Radiation use efficiency; Extinction coefficient.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200002

Characterization of maize populations in different environmental conditions by means of Three-Mode Principal Components Analysis
Provedor de dados: 118
Autores: Marticorena,Marta; Bramardi,Sergio; Defacio,Raquel.
Characterization of 31 native populations of maize conserved at the germplasm bank of the PNLA Pergamino Experimental Station, Argentina, was achieved by evaluating 10 quantitative attributes in two different environmental situations. The experimental design generated three-way or three-mode data, repeated observations of a set of attributes for a set of individuals in different conditions. The information was displayed in a three-dimensional array, and the structure of the data was explored using Three-Mode Principal Component Analysis, the Tucker-2 Model. A group of populations was identified that displayed homogeneous behavior in the two environments with respect to the following traits: ear length, prolificacy, grains per meter, yield and 1000 kernel...
Tipo: Journal article
Palavras-chave: Germplasm Bank; Genotype-environment interaction; Tucker-2 Model.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000300008

Characterization of mitochondrial iron uptake in HepG2 cells
Provedor de dados: 48
Autores: MAZARIEGOS,DORA INÉS; CABANTCHIK,Z. IOAV; CASSELS,BRUCE K; NÚÑEZ,MARCO TULIO.
There is increasing evidence that accumulation of redox-active iron in mitochondria leads to oxidative damage and contributes to various neurodegenerative diseases, such as Friedreich's ataxia and Parkinson's disease. In this work, we examined the existence of regulatory mechanisms for mitochondrial iron uptake and storage. To that end, we used rhodamine B- [(1,10-phenanthrolin-5-yl)amino carbonyl ] benzyl ester, a new fluorescent iron-sensitive probe that is targeted specifically to the mitochondrion. We found that extracellular iron was incorporated readily into mitochondria in an apparently saturable process. Moreover, the rate of iron incorporation responded to the Fe status of the cell, an indication that the mitochondrion actively regulates its iron...
Tipo: Journal article
Palavras-chave: Mitochondria; Iron homeostasis; RPA; HepG2 cells.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100024

Characterization of mouse salivary polypeptide secretion after oral administration of pilocarpine
Provedor de dados: 97
Autores: LÓPEZ-SOLÍS,REMIGIO; PUENTE,MARGARITA; DURÁN,VIVIANA; MORALES-BOZO,IRENE; KEMMERLING,ULRIKE; PARDO,RODRIGO; WENK,CAROLINA.
Mouse salivary secretion provoked by single or multiple oral administrations of the cholinergic agent pilocarpine was characterized. An accessory ad hoc device, manipulated by a single operator, was used to collect saliva from various mice simultaneously. A single challenge by pilocarpine in the range 40-400 µg provoked a dose-dependent secretory response. The secretory response lasted for about 40 minutes and was constituted by four clearly defined stages, namely: lag (5-10 min), maximal flow (10 min), slowering (15-20 min) and postsecretory rest. In this response, usual parameters were: maximal flow rate, 30-40 µl/min; total volume of saliva, 250-350 µl/mouse and total salivary protein, about 700 µg/mouse. Temporal desensitization of the secretory...
Tipo: Journal article
Palavras-chave: Mouse; Saliva; Secretion; Pilocarpine; Polypeptides.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000023

Characterization of novel genic SSR markers in Linum usitatissimum (L.) and their transferability across eleven Linum species
Provedor de dados: 69
Autores: Soto-Cerda,Braulio J; Saavedra,Hector Urbina; Navarro,Cristell Navarro; Ortega,Paula Mora.
Little is known about the evolutionary relationships among Linum species, basically because of the lack of transferable molecular markers. Currently, expressed sequence tags available in public databases provide an opportunity for the rapid and inexpensive development of simple sequence repeat (SSR) markers in wild flax species. In this regard, fifty expressed sequence tag-derived microsatellite markers (EST-SSRs) were evaluated for polymorphism and transferability in 50 Linum usitatissimum cultivars/accessions and 11 Linum species. Among them 23 EST-SSRs were polymorphic in L. usitatissimum, while 2-4 alleles were detected (average 2.26 per locus). The polymorphism information content value ranged from 0.08 to 0.55 (average 0.38). Forty one genic markers...
Tipo: Journal article
Palavras-chave: EST-SSRs; Expressed sequence tag; Flaxseed; Polymorphic loci; Relatives.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200004

Characterization of Occipital Condyle and Comparison of its Dimensions with Head and Foramen Magnum Circumferences in Dry Skulls of Iran
Provedor de dados: 77
Autores: Bayat,Parvindokht; Bagheri,Mahdie; Ghanbari,Ali; Raoofi,Amir.
The occipital condyle (OC) is an important area in craniovertebral surgery, but its anatomical features and the procedures concerning the OC have not been studied in detail yet. The aim of this study was to revisit the anatomy of the occipital condyle region and assess variations of the surrounding structures. Observations, on fifty dry skulls (dried specimens, 100 sides) and determined of condyle measurements. The mean length, width and height of occipital condyle were found to be 19.43±3.27 (right), 19.28±3.57 (left), 9.21±1.97 (right) 9.40±1.87 (left), 7.21±1.9 (right) and 7.33±2.74 mm (left), respectively. There were significant differences between right and left occipital condyles. The mean anterior intercondylar distance and posterior intercondylar...
Tipo: Journal article
Palavras-chave: Skull base; Foramen magnum; Occipital bone; Iran.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200011

Characterization of residual oils for biodiesel production
Provedor de dados: 69
Autores: Canesin,Edmilson Antonio; de Oliveira,Cláudio Celestino; Matsushita,Makoto; Felicidade Dias,Lucia; Reghiany Pedrão,Mayka; Evelazio de Souza,Nilson.
Background: Residual oils were characterized according to their physicochemical properties, i.e. acidity, iodine value, peroxide value and saponification number, to evaluate the degradation level and viability for biodiesel production. Results: The methyl esters of fatty acids (FAME) from samples of residual bovine, chicken and soybean oils were quantified by using four transesterification methods, using acidic and basic catalysis and, gas chromatography with flame ionization detector (GC-FID). Methods that used acidic catalysis at a lower temperature were the most efficient. Methyl biodiesel samples were synthesized by basic catalysis (KOH) for all quantified oils and the physicochemical properties of the biofuel were evaluated, i.e. viscosity, flash and...
Tipo: Journal article
Palavras-chave: Biodiesel properties; Gas chromatography; Infrared; Transesterification methods.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100007

Characterization of resistance expression in genotypes of Solanum Section Lycopersicon against Tuta absoluta (Lepidoptera: Gelechiidae)
Provedor de dados: 118
Autores: Vitta,Nancy; Estay,Patricia; Chorbadjian,Rodrigo A.
N. Vitta, P. Estay, and Chorbadjian, R.A. 2016. Characterization of resistance expression in genotypes of Solanum Section Lycopersicon against Tuta absoluta (Lepidoptera: Gelechiidae). Cien. Inv. Agr. 43(3):366-373. Two studies were conducted with the aim of characterizing the antixenosis and antibiosis resistance expression of genotypes in the Solanum section Lycopersicon against Tuta absoluta (Meyrick). The species used were S. lycopersicum (Fiorentino, Naomi and Belle), S. habrochaites (RCAT030597, PI126446), S. chilense (INIABB79), S. peruvianum (RCAT031296, RCAT039874 and RCAT030403) and S. pimpinellifolium (PI390739). For the antixenosis bioassay, a leaf was removed from plants of each genotype and placed in a cup with a floral foam soaked in water....
Tipo: Journal article
Palavras-chave: Antibiosis; Antixenosis; Host plant resistance; Insect-plant interactions; Tomato.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300003

Characterization of Sugars and Organic Acids in Commercial Varieties of Table Grapes
Provedor de dados: 117
Autores: Muñoz-Robredo,Pablo; Robledo,Paula; Manríquez,Daniel; Molina,Rosa; Defilippi,Bruno G.
Flavor composition has been defined as a complex attribute of fruit quality, in which the mix of sugars, acids and volatiles play a primary role. In table grapes (Vitis vinifera L.), sweetness and sourness are the most important flavor attributes for fresh consumption. However, most of the studies available have been performed on wine grapes, which are grown, cultured and processed differently to table grapes. Therefore, the objective of this work was to characterize the changes in sugars and organic acids during the development of ‘Thompson Seedless’, ‘Red Globe’ and ‘Crimson Seedless’ grown under the same agroclimatic conditions. Each variety was sampled weekly from 2 wk before véraison until commercial harvest. Sugars and organic acids were quantified...
Tipo: Journal article
Palavras-chave: Fructose; Glucose tartaric acid malic acid chromatography development stages HPLC.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300017

Characterization of the acetohydroxyacid synthase multigene family in the tetraploide plant Chenopodium quinoa
Provedor de dados: 69
Autores: Mestanza,Camilo; Riegel,Ricardo; Silva,Herman; Vásquez,Santiago C.
Background Currently, the technology called Clearfield® is used in the development of crops resistant to herbicides that inhibit the enzyme acetohydroxy acid synthase (AHAS, EC 2.2.1.6). AHAS is the first enzyme of the biosynthetic pathway that produces the branched-chain of the essential amino acids valine, leucine, and isoleucine. Therefore, multiple copies of the AHAS gene might be of interest for breeding programs targeting herbicide resistance. In this work, the characterization of the AHAS gene was accomplished for the Chenopodium quinoa Regalona-Baer cultivar. Cloning, sequencing, and Southern blotting were conducted to determine the number of gene copies. Results The presence of multiple copies of the AHAS gene as has been shown previously in...
Tipo: Journal article
Palavras-chave: Acetohydroxyacid synthase; Acetolactate synthase; Chenopodium quinoa; Homeologous pairing; Gene duplication.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600002

Characterization of the antiyeast compound and probiotic properties of a starter Lactobacillus plantarum DW3 for possible use in fermented plant beverages
Provedor de dados: 69
Autores: Kantachote,Duangporn; Prachyakij,Pakorn; Charernjiratrakul,Wilawan; Ongsakul,Metta; Duangjitcharoen,Yodsawee; Chaiyasut,Chaiyavat; Nitoda,Teruhiko; Kanzaki,Hiroshi.
Lactobacillus plantarum DW3 produced antifungal compounds that inhibited the growth of Rhodotorula mucilaginosa DKA, contaminating yeast in fermented plant beverages (FPBs) and various potential human pathogens. Phenyllactic acid (PLA) identified by gas chromatography- mass spectrometry (GC-MS) was produced at 31 mg/L PLA in MRS medium and 5 mg/ml inhibited growth of the target yeast in vitro by 90%. Other inhibitors were also present but not specifically identified. Results of in vitro tests showed that DW3 also had probiotic properties as it survived various human biological barriers resistance to pH 3, bile salts, growth without vitamin B12 and the presence and absence of oxygen. Its inhibitory effect against food borne pathogenic bacteria and spoilage...
Tipo: Journal article
Palavras-chave: Fermented plant beverage; Lactobacillus plantarum; Phenyllactic acid; Probiotics; Rhodotorula mucilaginosa; Weight control.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500002

Characterization of the Campylobacter fetus subsp. venerealis Adhesion to Bovine Sperm Cells
Provedor de dados: 77
Autores: Chiapparrone,María L; Soto,Pedro; Catena,María.
Campylobacter fetus is extracellular bacteria of the genital tract of cattle. They cause infertility and abortion, but there is no documented information on the susceptibility of bovine sperm cells to this bacteria. The aim of this present work was to study the effects provoked by Campylobacter fetus subsp. venerealis when in interaction with bovine sperm cells. The bovine spermatozoa were obtained frozen bovine semen pooled from uninfected bulls, and were exposed to living campylobacter over different periods of time. Light microscopy and scanning electron microscopy first revealed a tropism, then a close proximity followed by tight adhesion between these two different cells. A decrease in the spermatozoa motility was observed. Motile bacteria were...
Tipo: Journal article
Palavras-chave: Adhesion; Campylobacter fetus subsp. venerealis; Sperm cells.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400040

Characterization of the genetic structure of mango ginger (Curcuma amada Roxb.) from Myanmar in farm and genebank collection by the neutral and functional genomic markers
Provedor de dados: 69
Autores: Jatoi,Shakeel Ahmad; Kikuchi,Akira; Ahmad,Dawood; Watanabe,Kazuo N.
A preliminary characterization was undertaken to describe genetic structure of mango ginger (Curcuma amada) acquired from farmers and ex situ genebank in Myanmar using neutral (rice SSR based RAPDs) and functional genomic (P450 based analog) markers. The high polymorphism (&gt; 91%) depicted has displayed existence of genetic variability in the germplasm investigated. Large number of source-specific alleles (neutral-markers = 78, functional-markers = 63) was amplified which revealed that neutral regions of the mango ginger were more variable compared with the functional regions. The major fraction of the molecular variance (neutral-markers = 85%, functional-markers = 93%) was explained within germplasm acquisition sources and this tendency was also...
Tipo: Journal article
Palavras-chave: Curcuma amada; Genetic diversity; Mango-ginger; Myanmar; On-farm.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600004

Characterization of the long-terminal repeat single-strand tail-binding site of Moloney-MuLV integrase by crosslinking
Provedor de dados: 48
Autores: VERA,JORGE; VALENZUELA,BEATRIZ; ROTH,MÓNICA J; LEÓN,ÓSCAR.
Processing of viral DNA by retroviral integrase leaves a dinucleotide single-strand overhang in the unprocessed strand. Previous studies have stressed the importance of the 5' single-stranded (ss) tail in the integration process. To characterize the ss-tail binding site on M-MuLV integrase, we carried out crosslinking studies utilizing a disintegration substrate that mimics the covalent intermediate formed during integration. This substrate carried reactive groups at the 5' ss tail. A bromoacetyl derivative with a side chain of 6 A was crosslinked to the mutant IN 106-404, which lacks the N-terminal domain, yielding a crosslinked complex of 50 kDa. Treatment of IN 106-404 with N-ethylmaleimide (NEM) prevented crosslinking, suggesting that Cys209 was...
Tipo: Journal article
Palavras-chave: Integrase; Retrovirus; Crosslinking.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000100009

Characterization of the nuclear ribosomal DNA unit in Oxalis tuberosa (Oxalidacea) and related species
Provedor de dados: 69
Autores: Tosto,Daniela; Hopp,Esteban.
Oxalis tuberosa is an octoploid Andean tuber crop called "oca" that belongs to the worldwide distributed genus Oxalis. The genus is very heterogeneous and its systematics is still problematic. It has been proposed that O. tuberosa evolved by polyploidization of a still not defined ancestor that belongs to an alliance of species sharing the same basic chromosome number (x = 8). Nuclear rDNA units of O. tuberosa and a selected group of four related diploid species were characterised by RFLP using different restriction endonucleases and southern hybridization probes to produce a restriction map for EcoRI and BamHI. The major rDNA unit length in O. tuberosa was estimated at 10.7 kbp. As expected, restriction site variation was observed mainly in the intergenic...
Tipo: Journal article
Palavras-chave: Andean crops; Oca; Oxalis; RDNA; RFLPs.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300002

Characterization of the Uterus and Mammary Glands of the Female African Giant Rats (Cricetomys gambianus, Waterhouse) in Nigeria
Provedor de dados: 77
Autores: Akinloye,Adebayo Koyuum; Oke,Bankole Olusiji.
Morphology of the uterus and mammary glands were studied in sexually matured female African giant rat. The uterus was identified as being duplex, having two separate uterine horns and two cervices. The two cervices were partially fused and separated by a mid-saggital septum. Their thick musculatures projected caudally into the vagina as the portio vaginalis uteri. The results also showed that eight mammary glands, distributed along the lateral aspects of thoracic and inguinal regions, were present. The thoracic and the inguinal regions had four mammary glands each and were arranged in two pairs of cranial and caudal rows. These findings fill some gaps created by the dearth of information on the reproductive biology of the female African giant rat.
Tipo: Journal article
Palavras-chave: Cervices duplex; Thoracic and inguinal regions.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100012

Characterization of the Weed Seed Bank in Zero and Conventional Tillage in Central Chile
Provedor de dados: 117
Autores: Peralta Caroca,Rosa; Silva Candia,Paola; Acevedo Hinojosa,Edmundo.
We studied the abundance, species composition, and depth distribution of the weed seed bank under no-tillage (NT) and conventional tillage (CT) at two sites, A and B. Soil samples were taken at three soil depths (0-2, 2-5, and 5-15 cm). Germinated, dormant, and total seeds were counted. The total number of seeds was higher (p &amp;#8804; 0.05) under CT treatment at the two sites (CTA = 5175 seeds m-2, NTA = 3250 seeds m-2, CTB = 33770 m-2, and NTB = 22437 seeds m-2). The number of viable, dormant, and germinated seeds was also higher (p &amp;#8804; 0.05) in CT at the two sites. The percentage of viable seeds was low with 37% (CTA), 34% (CTB), 21% (NTA), and 8% (NTB). Viable seeds of Chenopodium album L. (CHEAL) dominated in the two trials with 67% (CTA),...
Tipo: Journal article
Palavras-chave: No-tillage species composition abundance; Depth distribution.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100017

Characterization of Tympanic Cavity Volume in Newborns using Computerized Tomography Scanning
Provedor de dados: 77
Autores: Acer,Niyazi; Unur,Erdogan; Sönmez,M. Fatih; Zararsiz,Gökmen; Arslan,Ayla; Sagiroglu,Ayse; Ertekin,Tolga; Erkan,Mustafa; Coskun,Abdulhakim; Bilgen,Mehmet.
This study reports tympanic cavity (TC) volume in newborns, which was missing in the literature. Ex vivo histology and computerized tomography (CT) scans were performed on temporal bone and data were analyzed in part using software developed in house. CT images with a slice thickness of 0.5 mm were obtained from 5 newborn cadavers and analyzed independently by two expert researchers. The border of the TC was delineated manually and measurement of area of interest was calculated on masked images. Then, the area measurements from all sections were added to estimate the total volume. The agreements between the histological and CT findings were then compared for accuracy, repeatability and reliability. The Dice and Jaccard similarity coefficient measures were...
Tipo: Journal article
Palavras-chave: Computerized tomography; Tympanic cavity; Tympanic cavity volume; Similarity index.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100027

Characterization of Volatile Compounds in the Essential Oil of Sweet Lime (Citrus limetta Risso)
Provedor de dados: 117
Autores: Colecio-Juárez,Maria C; Rubio-Núnez,Rubria E; Botello-Álvarez,José E; Martinez-González,Gloria M; Navarrete-Bolanos,José L; Jiménez-Islas,Hugo.
The essential oil of citrus fruit contains components pleasant sensory characteristics that are appreciated in food, pharmaceutical, and cosmetics industries. In the case of sweet lime (Citrus limetta Risso), is necessary to characterize the essential oil components, to identify potential uses of this fruit. The essential oil of sweet lime was obtained from lime flavedo in four different maturation stages. Steam distillation was employed and then compared with hexane extraction. The identification of the components in the essential oil was carried out by gas chromatography and mass spectrometry. A total of 46 components were found in the essence of lime, among which the highest concentration of compounds present were aldehydes such as limonene. Linalool,...
Tipo: Journal article
Palavras-chave: Sweet lime; Essential oil; Steam distillation; Maturation stages.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200017

Charles Darwin, Alfred Russel Wallace, and the Evolution / Creation of the Human Brain And Mind
Provedor de dados: 72
Autores: Glickman,Stephen E.
Charles Darwin and Alfred Russel Wallace independently discovered natural selection, and a set of common experiences surely contributed to that event. But, there were also major differences in their life-experience as collectors and travelers, their socio-political commitments, and their personal styles. The present paper is focused on, what is, perhaps, the most fundamental area of disagreement between Darwin and Wallace: the evolution of humanity. Darwin argued that human evolution could be explained by natural selection, with sexual selection as a signifcant supplementary principle. Wallace always had doubts about sexual selection, and ultimately concluded that natural selection alone was insuffcient to account for a set of uniquely human...
Tipo: Journal article
Palavras-chave: Darwin; Human evolution; Phrenology; Spiritualism; Wallace.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000300004

Checklist for Reporting Results Using Observational Descriptive Studies as Research Designs: The MInCir Initiative
Provedor de dados: 77
Autores: Manterola,Carlos; Otzen,Tamara.
Observational and descriptive studies (ODS) represent between 70 % and 80 % of the designs utilized in biomedical publications of the different scientific journals. Despite this, there are no tools to guide writers and to assist reviewers in reporting results with this type of research design. The aim of this study was to report the characteristics of a validated checklist for reporting the results using ODS as research designs in an English version. Two-stage study with qualitative methodology. In a first stage, a proposal was designed, by collecting items and domains from an extensive review of the literature. In the second, an instrument was developed by applying reduction items and domains through a panel of 45 experts comprised of clinical academics,...
Tipo: Journal article
Palavras-chave: Observational studies; Longitudinal Studies; Epidemiologic Studies; Descriptive Studies; Cross-Sectional Studies; Case Reports; Case series.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100013

Chemical and electric transmission in the carotid body chemoreceptor complex
Provedor de dados: 48
Autores: EYZAGUIRRE,CARLOS.
Carotid body chemoreceptors are complex secondary receptors. There are chemical and electric connections between glomus cells (GC/GC) and between glomus cells and carotid nerve endings (GC/NE). Chemical secretion of glomus cells is accompanied by GC/GC uncoupling. Chemical GC/NE transmission is facilitated by concomitant electric coupling. Chronic hypoxia reduces GC/GC coupling but increases G/NE coupling. Therefore, carotid body chemoreceptors use chemical and electric transmission mechanisms to trigger and change the sensory discharge in the carotid nerve.
Tipo: Journal article
Palavras-chave: Carotid body; Chemosensory activity; Glomus cells.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000400005

Chemical and Nutritional Composition of Copao Fruit (Eulychnia acida Phil.) Unswe Thee Environmental Conditions in the Coquimbo Region
Provedor de dados: 117
Autores: Masson S,Lilia; Salvatierra,María Angélica; Robert C,Paz; Encina A,Cristian; Camilo M,Conrado.
Copao (Eulychnia acida Phil.) is an endemic arborescent cactus restricted mainly to the semi-arid Coquimbo Region (29°54'28" S, 71°15'15" W), Chile. The area of distribution is from sea level to 1200 m.a.s.l. The edible fruit called rumpa is generally round, with green or pink peel and small scales on its surface, showing wide variability in size and weight. The aim of this work was to characterize the rumpa harvested in January 2009 and 2010 in three sectors of Coquimbo Region to determine chemical and nutritional composition in three fractions: pulp with seeds, juice, and peel. The research showed that this fruit is a good natural source of mainly soluble dietary fiber, which has a jellied texture and is present in the three fractions analyzed: 2% for...
Tipo: Journal article
Palavras-chave: Rumpa; Arborescent cactus; Vitamin C; Minerals.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400004

Chemical and physical characterization of Opuntia spp. seeds grown in Hidalgo State, Mexico
Provedor de dados: 118
Autores: Prieto-García,Francisco; Prieto Méndez,Judith; Acevedo Sandoval,Otilio A; Canales Flores,Roberto A; Marmolejo Santillán,Yolanda.
Nopal fruits (Opuntia spp.) represent a valuable food in various Latin America countries. Typically, the seeds are discarded. However, they could contain basic components that might enable their use as a nutritional supplement or as another product convenient for the food industry. The objective of this paper was to perform a physical and chemical characterization of the seeds of three species of Opuntia (O. Heliabravoana, O. Xoconostle, and O. ficus-indica) to provide data that will help determine their potential use. Fruits were collected in different municipalities of Hidalgo State, Mexico; its seeds were extracted, dried, and analyzed. The results reveal that, except for small differences, the seeds had similarity in the physical characteristics of...
Tipo: Journal article
Palavras-chave: Cactaceae; Electron microscope; Heavy metals; Particle size; Prickly pear; Proximal analysis.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000100013

Chemical Composition and Allelopathyc Activity of Essential Oil of Lippia sidoides Cham
Provedor de dados: 117
Autores: Araújo Marco,Cláudia; Teixeira,Erlan; Simplício,Antonio; Oliveira,Carlos; Costa,José; Feitosa,José.
The allelopathy is a process for which products of the secondary metabolism, as terpenes phenolic, of a certain vegetal intervene significantly, generally of antagonistic form, in the development of other species of plants. The objective of this work was to chemically characterize the essential oil of Lippia sidoides Cham. growing in the Cariri cearense region, Brazil, and evaluate the allelopathyc effect of this oil on the germination of lettuce (Lactuca sativa L.), arugula (Eruca sativa Mill.), and cauliflower (Brassica oleracea L.), in pre-plantation application. The monoterpene thymol (84.90%) has been identified as the principal constituent in the essential oil. The experiment was done in randomized complete block, in 4 x 3 factorial; being used four...
Tipo: Journal article
Palavras-chave: Allelopathy; Plant oil.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100025

Chemical composition and antibacterial activities of seven Eucalyptus species essential oils leaves
Provedor de dados: 48
Autores: Sebei,Khaled; Sakouhi,Fawzi; Herchi,Wahid; Khouja,Mohamed Larbi; Boukhchina,Sadok.
BACKGROUND: In this paper, we have studied the essential oils chemical composition of the leaves of seven Eucalyptus species developed in Tunisia. Eucalyptus leaves were picked from trees growing in different arboretums in Tunisia. Choucha and Mrifeg arboretums located in Sedjnene, region of Bizerte (Choucha: E. maideni, E. astrengens et E. cinerea; Mrifeg : E. leucoxylon), Korbous arboretums located in the region of Nabeul, North East Tunisia with sub-humid bioclimate, (E. lehmani), Souiniet-Ain Drahem arboretum located in region of Jendouba (E. sideroxylon, E. bicostata). Essential oils were individually tested against a large panel of microorganisms includingStaphylococcus aureus (ATCC 6539), Escherichia coli (ATCC 25922), Enterococcus faecalis...
Tipo: Journal article
Palavras-chave: Eucalyptus; Essential oil; Antibacterial activity; -pinene.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100007

Chemical composition and antifungal activity of Piper auritum Kunth and Piper holtonii C. DC. against phytopathogenic fungi
Provedor de dados: 117
Autores: Pineda M,Rodrigo; Vizcaíno P,Samuel; García P,Carlos M; Gil G,Jesús H; Durango R,Diego L.
The growth of fungi during pre - and postharvest of fruits may cause spoilage and result in a reduction in quality and quantity. The aim of the present work was to investigate the efficacy of four extracts (n-hexane, dichlorometane, ethyl acetate, and methanol) and the essential oil of Piper auritum Kunth and P. holtonii C. DC. on the growth inhibition of three important postharvest pathogens of fruits (Colletotrichum acutatum, C. gloeosporioides, and Botryodiplodia theobromae). The in vitro antifungal activity was assayed following the poisoned food technique. The results showed that both n-hexane extract (HE) as essential oil (EO) displayed a relative good control against the three pathogens, being the originating materials of P. holtonii the most...
Tipo: Journal article
Palavras-chave: Piperaceae; Essential oil; Apiol; Colletotrichum; Botryodiplodia.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400008

Chemical composition, insecticidal, and antifungal activities of fruit essential oils of three colombian Zanthoxylum species
Provedor de dados: 117
Autores: Prieto,Juliet A; Patiño,Oscar J; Delgado,Wilman A; Moreno,Jenny P; Cuca,Luis E.
This study determined the chemical composition of essential oils isolated from Zanthoxylum monophyllum (Lam.) P. Wilson, Z. rhoifolium Lam., and Z. fagara (L.) Sarg. fruits by steam distillation, as well as testing antifungal and insecticidal activities of essential oils as potential pesticides. Gas chromatography-mass spectrometry (GC/MS) analysis identified 57 compounds. The main constituents in Z. rhoifolium oil were &amp;#946;-Myrcene (59.03%), &amp;#946;-phellandrene (21.47%), and germacrene D (9.28%) , the major constituents of Z. monophyllum oil were sabinene (25.71%), 1,8-cineole (9.19%), and cis-4-thujanol (9.19%), whereas fruit oil of Z. fagara mainly contained germacrene D-4-ol (21.1%), elemol (8.35%), and &amp;#945;-cadinol (8.22%). Zanthoxylum...
Tipo: Journal article
Palavras-chave: Fumigant; Antifungal; Insecticidal.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100009

Chemical composition of corn and sorghum grains cultivated in Oxisol with different application methods and doses of zinc
Provedor de dados: 118
Autores: Puga,Aline P; de Mello Prado,Renato; Mattiuz,Ben-Hur; Wyllyam do Vale,Diego; Fonseca,Ivana M.
In general, tropical soils present low concentrations of zinc (Zn), and the deficiency of Zn is recognized as a world nutritional problem for cereal production and human beings. Therefore, the main goal of this study was to assess the effects of different methods of Zn application on the quality of corn and sorghum grains grown in Oxisol. Two experiments were set up in the experimental area of UNESP (campus of Jaboticabal, Brazil). The following nine treatments were applied: three doses of Zn by banded application (seed furrows), three doses of Zn by incorporation into soil (0-20 cm depth), foliar application, seed application, and control (no Zn applied). The treatments were arranged in randomized blocks with four replicates. The contents of Zn,...
Tipo: Journal article
Palavras-chave: Carbohydrate; Protein; Sorghum bicolor; Zea mays L; Zn.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100008

Chemical constituents and toxicity of Agastache foeniculum (Pursh) kuntze essential oil against two stored-product insect pests
Provedor de dados: 117
Autores: Ebadollahi,Asgar.
The uncontrolled use of synthetic insecticides is a great hazard for the environment and consumers. Essential oils were introduced as low toxic agents against mammals and non-targeted insects. In this study, essential oil from aerial parts of blue giant hyssop (Agastache foeniculum [Pursh] Kuntze) (Lamiaceae) was isolated by the water steam distillation method with a Clevenger apparatus, and its chemical composition was studied by gas chromatography mass spectrometry. The toxicity of A. foeniculum essential oil against red flour beetle, Tribolium castaneum (Herbst), and lesser grain borer Rhyzopertha dominica (F.) was evaluated by fumigation at 24, 48, and 72 h exposure times. Estragole and 1,8-cineole were identified as major constituents of the A....
Tipo: Journal article
Palavras-chave: Blue giant hyssop; Fumigation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200005

Chemical Constituents and Toxicity of Essential Oils of Oriental Arborvitae, Platycladus orientalis (L.) Franco, against Three Stored-Product Beetles
Provedor de dados: 117
Autores: Mehdi Hashemi,Seyed; Ali Safavi,Seyed.
Plant secondary metabolites play an important role in plant-insect interactions and therefore such compounds may have insecticidal or biological activity against insects. Fumigant toxicity of essential oils of leaves and fruits from oriental arborvitae (Platycladus orientalis (L.) Franco) (Cupressaceae) was investigated against adults of cowpea weevil (Callosobruchus maculatus Fab.), rice weevil (Sitophilus oryzae L.), and red flour beetle (Tribolium castaneum Herbst). Fresh leaves and fruits were subjected to hydrodistillation using a Clevenger-type apparatus and the chemical composition of the volatile oils was studied by gas chromatography-mass spectrometry (GC-MS). Twenty-six compounds (92.9%) and 23 constituents (97.8%) were identified in the leaf and...
Tipo: Journal article
Palavras-chave: Botanical insecticides; Fumigation; Stored-product insects.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200004

Chemical properties of volcanic soil affected by seven-year rotations
Provedor de dados: 117
Autores: Hirzel,Juan; Undurraga,Pablo; González,Jorge.
Long-term crop rotation systems can benefit soil chemical-physical properties and crop productivity. The lack of information on the effect of long-term crop rotations on soil chemical-physical properties for volcanic soils in Chile could restrict reaping real benefits, and make it difficult to take agricultural management decisions, which could lead to possible negative consequences on some soil chemical-physical properties and the environment. The development of information associated with the effect on soil chemical-physical properties with respect to long-term rotation systems and their fertilization management contribute to improving agronomic management decisions for these soils. A study was carried out to assess the effect of six rotation systems...
Tipo: Journal article
Palavras-chave: Crop rotation; Andisol; Nutrient management; Soil fertility.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200016

Chemopreventive Effect of Brazilian Green Propolis on Experimental Dermal Carcinogenesis in Murine Model
Provedor de dados: 77
Autores: Pereira-Filho,Rose Nely; Batista,Fellipe Santos; Ribeiro,Danielle Rodrigues; Melo,Genecy Calado de; Reis,Francisco Prado; Melo,Allan Ulisses Carvalho de; Gomes,Margarete Zanardo; Cardoso,Juliana Cordeiro; Albuquerque Júnior,Ricardo Luiz Cavalcanti de.
The aim of this study was to assess the effect of oral administration of Hydroalcoholic Extract of Green Propolis (HEGP) on dermal carcinogenesis in rodent model. For the biological assay, we used 36 mice, assigned into 6 groups (n=6): CTR (treated with 100 mg/kg HEGP and no tumor induction), TUM (treated with water and tumor induction), GP10 (treated with 10 mg/kg HEGP and tumor induction), GP50 (treated with 50 mg/kg HEGP and tumor induction) and GP100 (treated with 100 mg/kg HEGP and tumor induction). Cancer induction was performed in the back of the mice by topical application of DMBA. After 16 weeks, mice were euthanized and their backs were submitted to post-mortem histological analysis. The mean number of lesions developed in TUM (4.14±0.89) was...
Tipo: Journal article
Palavras-chave: Propolis; Skin cancer.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200024

Chile Ciencia 2000
Provedor de dados: 48
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97601999000400001

CHILE INVITA A CHILE: INSTITUTO MILENIO DE BIOLOGIA FUNDAMENTAL Y APLICADA ORGANIZA ORIGINAL ENCUENTRO DE ESTUDIANTES
Provedor de dados: 48
Autores: ROSEMBLATT,MARIO.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000200007

Chilean IPNV isolates: Robustness analysis of PCR detection
Provedor de dados: 69
Autores: Jorquera,Esteban; Morales,Paz; Tapia,David; Torres,Pamela; Eissler,Yoanna; Espinoza,Juan C; Conejeros,Pablo; Kuznar,Juan.
Background: The genomes of several infectious pancreatic necrosis viruses (IPNVs) isolated in Chile were sequenced with a single amplification approach for both segments A and B. The resulting sequences were then used to determine the conservation of the primer-binding regions used in polymerase chain reaction (PCR)-based diagnostic methods proposed in the literature. Thus, the robustness of each technique was studied, particularly the eventual effect of further mutations within the primer-binding sites. Results: On analysis, most methods currently used to detect Chilean IPNV varieties were deemed adequate. However, the primers were designed to be genogroup specific, implying that most detection methods pose some risk of detecting all strains prevalent in...
Tipo: Journal article
Palavras-chave: IPNV detection; Mismatch's Tm analysis; QPCR.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000200005

CHILEAN MARINE MOLLUSCA OF NORTHERN PATAGONIA COLLECTED DURING THE CIMAR-10 FJORDS CRUISE
Provedor de dados: 72
Autores: Cárdenas,Javiera; Aldea,Cristian; Valdovinos,Claudio.
The tip of the South American cone is one of the most interesting Subantarctic areas, both biogeographically and ecologically. Nonetheless, knowledge of the area's biodiversity, in particular that of the subtidal marine habitats, remains poor. Therefore, in 2004, a biodiversity research project was carried out as a part of the cruise Cimar-10 Fjords, organized and supported by the Chilean National Oceanographic Committee (CONA). The results of the subtidal marine mollusk surveys are presented herein. The samples were collected aboard the Agor 60 "Vidal Gormaz" in winter 2004. The study area covered the northern Chilean Patagonia from Seno de Relocanví (41°31'S) to Boca del Guafo (43°49'S), on the continental shelf from 22 to 353 m depth. The Mollusca were...
Tipo: Journal article
Palavras-chave: Biodiversity; Taxonomy; South America; Fjords; Polyplacophora; Gastropoda; Bivalvia; Scaphopoda.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200010

Chironomidae (Insecta, Diptera) associated with stones in a first-order Atlantic Forest stream
Provedor de dados: 97
Autores: ROSA,BEATRIZ F. J. V; VASQUES,MONIQUE; ALVES,ROBERTO G.
Stones are stable substrates in streams, usually sheltering high richness and abundance of invertebrates. To investigate the structure of the Chironomidae assemblages associated with stones in a first-order stream located in an Atlantic Forest reserve in two periods of the year, stones with diameters from 10 cm to 25 cm were collected along a stretch of 100 m in riffle areas, during three months in the dry season and three months in the rainy season. The structure of the community was analyzed for each period through calculation of observed richness, Shannon's diversity (H'), and Pielou's evenness. The ordination of the samples from the dry and rainy seasons was evaluated by detrended correspondence analysis (DCA) and the presence of indicator species in...
Tipo: Journal article
Palavras-chave: Aquatic insects; Lotic systems; Rainfall variation; Substrates.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300006

Chitinase from Enterobacter sp. NRG4: Its purification, characterization and reaction pattern
Provedor de dados: 69
Autores: Dahiya,Neetu; Tewari,Rupinder; Tiwari,Ram P; Singh Hoondal,Gurinder.
Enterobacter sp. NRG4 was shown to excrete chitinase into the culture supernatant when cultivated in medium containing chitin. A 60 kDa extracellular chitinase was purified to homogeneity and characterized. The enzyme hydrolyzed swollen chitin, colloidal chitin, regenerated chitin and glycol chitin but did not hydrolyze chitosan. The chitinase exhibited Km and Vmax values of 1.43 mg ml-1 and 83.33 µM µg-1 h-1 for swollen chitin, 1.41 mg ml-1 and 74.07 µM µg-1 h-1 for colloidal chitin, 1.8 mg ml-1 and 40 µM µg-1 h-1 for regenerated chitin and 2.0 mg ml-1 and 33.33 µM µg-1 h-1 for glycol chitin, respectively. The optimal temperature and pH for activity were 45ºC and pH 5.5, respectively. Mg2+, K+ and Ca2+ stimulated chitinase activity by 13, 16 and 18%,...
Tipo: Journal article
Palavras-chave: Chemical modification; Chitinase; Enterobacter sp. NRG4; Purification; Substrate binding.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200003

Chlorinated biphenyl degradation by wild yeasts pre-cultured in biphasic systems
Provedor de dados: 69
Autores: Romero,M. Cristina; Reinoso,Enso Hugo; Moreno Kiernan,Alejandro; Urrutia,M. Inés.
Environmental biotechnology has developed as an offshoot from sanitary engineering, and only recently the biological component of the ecosystems had been recognized as relevant when bioremediation strategies must be chosen to solve environmental problems. Yeasts were isolated on 2,4-dichlorobiphenyl, 2,3',4- and 2,4',5-trichlorobiphenyl, poorly soluble compounds in water, as carbon sources. Debaryomyces castelli, Debaryomyces maramus and Dipodascus aggregatus composed the mixed culture and represented 72% of the isolates; their degradation potential were studied in biphasic and monophasic systems. The biphasic cultures were obtained with phenol as the organic phase and MSM as the aqueous ones, the monophasic medium only with MSM. Both cultures were...
Tipo: Journal article
Palavras-chave: Biphasic system; Fungal adaptation; Increased solubilities; Transformation rates; Yeasts communities.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300013

Chloroperoxidase mediated oxidation of chlorinated phenols using electrogenerated hydrogen peroxide
Provedor de dados: 69
Autores: La Rotta,Camilo E; D'Elia,Eliane; Bon,Elba P.S.
Chloroperoxidase (CPO) from Caldariomyces fumago catalyses the oxidation of several chlorinated phenols (CP) commonly found in industrial waste waters in the presence of hydrogen peroxide. This study compares the direct addition of hydrogen peroxide (DA) with its continuous electrogeneration (EG) during the enzymatic oxidation of CP. Reaction mixtures were studied containing chemically modified CPO, hydrogen peroxide and the phenolic substrates: phenol (P), 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP), in 100 mM sodium-potassium phosphate buffer pH 6.0, at 25ºC. Results were compared in terms of residual phenol concentration (oxidation efficiency), precipitate formation (removal) and...
Tipo: Journal article
Palavras-chave: Biodegradation; Bioelectrochemistry; Caldariomyces fumago; Chlorinated phenols; Chloroperoxidase; Hydrogen peroxide electrogeneration.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100003

Chlorophyll fluorescence response of Pinus radiata clones to nitrogen and phosphorus supply
Provedor de dados: 118
Autores: Bown,Horacio E; Mason,Euan G; Clinton,Peter W; Watt,Michael S.
Chlorophyll fluorescence responses to a factorial combination of nitrogen (N) and phosphorus (P) supply were measured in five clones of Pinus radiata cultivated in a greenhouse over twenty-four months. Chlorophyll fluorescence measurements were taken at months six (5 clones, 182 plants), nine (2 clones, 68 plants) and eighteen (2 clones, 48 plants). Plant growth in stem diameter, height, leaf area, fascicle mass, length and diameter were found to significantly increase with N and, to a lesser extent, P additions; and these values were greatest when both N and P were combined. Plant growth and fascicle size also varied significantly across clones and were generally consistent with the genotypic growth responses that were observed in the field. Dark (Fv /...
Tipo: Journal article
Palavras-chave: Chlorophyll fluorescence; Quantum efficiency of PSII; Electron transport; Genotype; Nutrient limitation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300012

Chloroplast localization of Cry1Ac and Cry2A protein- an alternative way of insect control in cotton
Provedor de dados: 48
Autores: Muzaffar,Adnan; Kiani,Sarfraz; Khan,Muhammad Azmat Ullah; Rao,Abdul Qayyum; Ali,Arfan; Awan,Mudassar Fareed; Iqbal,Adnan; Nasir,Idrees Ahmad; Shahid,Ahmad Ali; Husnain,Tayyab.
BACKGROUND: Insects have developed resistance against Bt-transgenic plants. A multi-barrier defense system to weaken their resistance development is now necessary. One such approach is to use fusion protein genes to increase resistance in plants by introducing more Bt genes in combination. The locating the target protein at the point of insect attack will be more effective. It will not mean that the non-green parts of the plants are free of toxic proteins, but it will inflict more damage on the insects because they are at maximum activity in the green parts of plants. RESULTS: Successful cloning was achieved by the amplification of Cry2A, Cry1Ac, and a transit peptide. The appropriate polymerase chain reaction amplification and digested products confirmed...
Tipo: Journal article
Palavras-chave: Chloroplast transient peptide; Cry1Ac; Cry2A; Bt; CTP; Cry genes; Endotoxins; GUS; Transgenic plants.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100014

Chlorpheniramine impairs spatial choice learning in telencephalon-ablated fish
Provedor de dados: 48
Autores: ROMAGUERA,FERNANDA; MATTIOLI,ROSANA.
This work investigated the effect of the Hj receptor blockade in the forebrain of ablated Carassius auratus in a simple stimulus-response learning task using a T-maze test with positive reinforcement. The goldfish were submitted to surgery for removal of both telencephalic lobes five days before beginning the experiment. A T-shaped glass aquarium was employed, with two feeders located at the extremities of the long arm. One of the two feeders was blocked. The experimental triáis were performed in nine consecutive days. Each fish was individually placed in the short arm and confined there for thirty seconds, then it was allowed to swim through the aquarium to search for food for ten minutes (máximum period). Time to find food was analysed in seconds....
Tipo: Journal article
Palavras-chave: Histamine; Learning; Teleost fish; Telencephalon.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000300010

Choice of the adequate quantification method for recombinant human GM-CSF produced in different host systems
Provedor de dados: 69
Autores: Bollati Fogolín,Mariela; Eberhardt,Marcos Oggero; Kratje,Ricardo; Etcheverrigaray,Marina.
Three enzyme-linked-immunosorbent assays (ELISA) were developed and compared with a bioassay to quantify the recombinant human granulocyte-macrophage colony stimulating factor (rhGM-CSF). These assays were suitable to quantify the non-glycosylated rhGM-CSF present in mixtures with variable protein content, and therefore useful for determining concentrations of the cytokine in production processes. Among these assays, the competitive ELISA, developed with a MAb that recognises an epitope not involved in glycosylation, was the only one suitable to quantify the glycosylated form of rhGM-CSF produced in mammalian cell cultures.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300008

Cholesterol oxidation: Health hazard and the role of antioxidants in prevention
Provedor de dados: 48
Autores: VALENZUELA,ALFONSO; SANHUEZA,JULIO; NIETO,SUSANA.
Cholesterol is a molecule with a double bond in its structure and is therefore susceptible to oxidation leading to the formation of oxysterols. These oxidation products are found in many commonly-consumed foods and are formed during their manufacture and/or processing. Concern about oxysterols consumption arises from the potential cytotoxic, mutagenic, atherogenic, and possibly carcinogenic effects of some oxysterols. Eggs and egg-derived products are the main dietary sources of oxysterols. Thermally-processed milk and milk-derived products are another source of oxysterols in our diet. Foods fried in vegetable/animal oil, such as meats and French-fried potatoes, are major sources of oxysterols in the Western diet. Efforts to prevent or to reduce...
Tipo: Journal article
Palavras-chave: Cholesterol; Cholesterol oxidation; Oxysterols; Synthetic antioxidants; Natural antioxidants.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000300002

Chondrogenic Differentiation of Bone Marrow Mesenchymal Stem Cells: First Successful Latin-American Report
Provedor de dados: 77
Autores: Mardones,Rodrigo; Martínez,Rafael; Paredes,María Jose; Zalaquett,Eugenio.
Osteoarthritis is the more frequent cause of disability in adult people and it is associated to cartilage degeneration of affected joints. This cartilage has a limited ability to repair. Several treatments have been tested including the use of Mesenchymal Stem Cells. These cells are an attractive source for cartilage repair because of their availability to chodrogenic differentiation by progressing sequentially through the expression of cartilage specific extracelullar matrix molecules, as in the embryologic human development. The aim is to obtain, culture and differentiate rabbit Bone Marrow derived Mesenchymal Stem Cells in vitro to chondral lineage. By differential centrifugation the mononuclear cell level was obtained from rabbit bone marrow samples....
Tipo: Journal article
Palavras-chave: Chondrogenic differentiation; Mesenchymal Stem Cells; Osteoarthritis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300014

CHORDAE TENDINEAE ARCHITECTURE IN THE PAPILLARY MUSCLE INSERTION
Provedor de dados: 77
Autores: Wang Gusukuma,Luciana; Prates,José Carlos; Smith,Ricardo Luiz.
Chordae tendineae architecture and their junction with papillary muscle were studied with scanning electron microscopy, comparing human and swine hearts. Papillary muscles with the corresponding chordae tendineae were obtained from human and pig (Sus scrofa) hearts after exposition of the left ventricle cavity, fixed with 4% formaldehyde. The specimens were sectioned in small samples and divided in four groups, a control one and the others submitted to digestion in a solution of 2.5% sodium hypochlorite in saline solution during 5, 10 and 15 minutes respectively. The specimens were washed and fixed in 1% osmium tetroxide in cacodylate buffer, kept in 1% tannic acid for 30 minutes, dehydrated and critical point dried, mounted and sputtered with gold. The...
Tipo: Journal article
Palavras-chave: Chordae tendineae; Architecture; Human; Pigs; Scanning electron microscopy.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400005

CHORISPORA TENELLA (PALL.) DC. (BRASSICACEAE), NUEVO REGISTRO PARA LA FLORA ADVENTICIA DE CHILE
Provedor de dados: 73
Autores: Teillier,Sebastián; Prina,Aníbal; Romero,Fernanda.
Chorispora tenella (Pall.)DC., is registered for first time for Chilean territory as an alien species. A brief description and illustration is given. The specimens here cited were collected at the Yeso valley, at 2400 m altitude (33°41'S -70°06'W)
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200012

Choristoneura rosaceana (Harris) and Pandemis pyrusana Kearfott (Lepidoptera: Tortricidae) Male Control in Washington State (USA) Apple Orchards Treated with Different Source Densities of Several Attracticide Formulations
Provedor de dados: 113
Autores: Curkovic,Tomislav; F. Brunner,Jay.
This is the first report on attracticides loaded with 1.6 or 16% pheromone, with or without 6% permethrin, tested for Choristoneura rosaceana (Harris) and Pandemis pyrusana Kearfott male control. Different densities of attracticide sources (750-3,600 droplets ha-1) homogeneously applied on the canopy were compared in apple (Malus pumila Mill.) orchards. Before attracticide application, no differences in male captures using pheromone baited trap were observed. Afterwards, a significant reduction of captures occurred along with the increasing pheromone concentration, when larger density sources were used. The addition of permethrin into the attracticide formulation, however, did not significantly improve the reduction of males. Overall, these results suggest...
Tipo: Journal article
Palavras-chave: Attracticides; Permethrin; Pheromone concentration; Point source density; Mating disruption.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000100003

Chromosomal localization of selected SCARs converted from new RAPD, ISSR and R-ISSR markers linked to rye (Secale cereale L.) tolerance to nutrient deprivation stress identified using bulk segregant analysis
Provedor de dados: 69
Autores: Smolik,Milosz.
Background: An adaptive mechanism in plant roots is initiated in the event of nitrogen and potassium deficiency, and it facilitates the active uptake of these elements in order to ensure plant growth and survival in stress conditions. Signaling and transduction of signals in response to changing nitrogen and potassium concentrations is a complex process, affected by interactions between various gene expression products, and often subjected to modifications. Results: In order to identify genotypic differences between phenotypes of two populations of recombinant inbred rye lines (153/79-1 x Ot1-3 and Ot0-6 x Ot1-3) in response to nutrition stress caused by nitrogen and potassium deficiency at the seedling stage, bulk segregant analysis was utilized....
Tipo: Journal article
Palavras-chave: Molecular markers; Nutrient deficiencies; Orthologs; Response; RILs; Rye; TIGR; TOGA.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500001

Chromosome Instability in Carcinomas
Provedor de dados: 77
Autores: Assumpção,Paulo Pimentel de; Seabra,Aline Damasceno; Leal,Mariana Ferreira; Guimarães,Adriana Costa; Calcagno,Danielle Queiroz; Khayat,André Salim; Smith,Marilia de Arruda Cardoso; Burbano,Rommel Rodriguez.
In the current carcinogenesis models, the occurrence of increasing mutations and selection mechanisms favoring cell survival and higher proliferation rates are taken into account. Epigenetic mechanisms, among which DNA methylation stands out, also take part in oncogenesis. The characteristic of tumor cells that allows the increase of mutations is named genetic instability, encompassing two mechanisms: microsatellite instability, characterized by nucleotide alterations with errors in the DNA repair systems; and chromosomal instability, represented by aberrations occurring in large chromosome segments. Carcinomas are characterized by complex cytogenetic alterations and large gene amalgamations. Telomeric alterations, inadequately repaired DNA breaks, and...
Tipo: Journal article
Palavras-chave: Chromosomal instability; Carcinomas; Aneuploidies.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400007

Chromosome localisation of nucleolar organizer region in Rhodophiala bagnoldii (Herb.) Traub (Asparagales: Amaryllidaceae) determined by silver nitrate staining
Provedor de dados: 73
Autores: Jara-Seguel,Pedro; Palma-Rojas,Claudio; Contreras,Javier; von Brand,Elisabeth.
Estudios cariotípicos en Rhodophiala bagnoldii (Herb.) Traub (2n = 18) han descrito constricciones secundarias subteloméricas localizadas en el brazo largo del par cromosómico 7. En este trabajo, una señal Ag-NOR positiva fue observada en la constricción secundaria de ambos cromosomas homólogos. Nucléolos fusionados y no fusionados fueron también observados en núcleos interfásicos de células meristemáticas.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100023

Chromosome number of two Chilean species of Nothofagus (Nothofagaceae)
Provedor de dados: 73
Autores: JARA-SEGUEL,PEDRO; CÁRCAMO-FINCHEIRA,PAZ; PALMA-ROJAS,CLAUDIO; VON BRAND,ELISABETH.
Se documenta un número cromosómico 2n = 26 (x = 13) para Nothofagus dombeyi (Mirb.) Oerst. y N. glauca (Phil.) Krasser, el cual es similar al descrito previamente para otras especies del género. Se incrementan a 13 las especies de Nothofagus con número cromosómico conocido, existiendo dos números básicos (x = 13, 14).
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200015

CHROMOSOME NUMBERS IN CHILEAN SPECIES OF LUZURIAGA RUIZ ET PAV. (LUZURIAGACEAE)
Provedor de dados: 73
Autores: Jara-Seguel,Pedro; Zúñiga,Cristina A.
Mitotic chromosome counts for Luzuriaga radicans Ruiz et Pav. and L. polyphylla (Hook) J.F. Macbr. from Chile, reported here for the first time, are the same as those reported for L. parviflora (Hook) Kunth in New Zealand and L. marginata (Gaertner) Benth. on Falkland Islands (2n = 2x = 20). These results indicate a constancy of chromosome number in the genus Luzuriaga
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100010

CHROMOSOME NUMBERS OF CHILEAN PTERIDOPHYTES: FIRST CONTRIBUTION
Provedor de dados: 73
Autores: Jara-Seguel,Pedro; Romero-Mieres,Mario; Palma-Rojas,Claudio.
Mitotic chromosome counts in Chilean pteridophytes confirm the diploidy described for Equisetum L. (2n = 216) and Blechnum L. (2n = 66), as well as the tetraploidy of Asplenium L. (2n = 144). Megalastrum spectabile (Kaulf.) A.R.Sm. et R.C.Moran is diploid (2n = 82), while in metaphases of Polystichum subintegerrimum (Hook. et Arn.) R.A.Rodr. chromosome numbers from ca. 311 to 328 were counted. Tetraploidy was also described in Adiantum chilense Kaulf. (2n = 116)
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100007

CHROMOSOMES AND Ag-NOR LOCATION IN FLUVIATE POPULATIONS OF SALMO TRUTTA FARIO L. 1758 (SALMONIFORMES: SALMONIDAE) FROM ATACAMA DESERT, CHILE
Provedor de dados: 72
Autores: Northland-Leppe,Irma; Lam,Natalia; Jara-Seguel,Pedro; Capetillo-Arcos,Juana.
Salmo trutta fario L. 1758, presented a chromosome number 2n = 80 and a fundamental number NF = 100. Thehaploid chromosome set consists of seven metacentric chromosomes, three submetacentric, one subtelocentric and 29 telocentrics. The Ag-NOR are located at conserved position in the short arm of pair 11 (st), with the presence of additional NOR on the short arm of pair 9 (sm) which is rare in others taxa previously studied.
Tipo: Journal article
Palavras-chave: Salmo truttafario; Chromosomes; Atacama region; Chile.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100007

Chromosomes of Girella laevifrons (Tschudi 1846) (Osteichthyes: Kyphosidae)
Provedor de dados: 72
Autores: Northland-Leppe,Irma; Véjar,Drina; Jara-Seguel,Pedro; Fuentes,Nelson; Núñez,Cristian.
The chromosome number and karyotype morphology of Girella laevifrons (Tschudi 1846) are described for the first time. G. laevifrons presents a chromosome number of 2n = 48 and its karyotype is formed in both sexes by 24 acrocentric chromosome pairs, similar to what has been described for other species of Girella Gray, 1835.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200007

CHROMOSOMES OF THE LIMPET FISSURELLA LIMBATA (SOWERBY, 1835) FROM NORTHERN CHILE (ARCHAEOGASTROPODA: FISSURELLIDAE)
Provedor de dados: 72
Autores: Pinochet-Roco,José; Northland-Leppe,Irma; Capetillo-Arcos,Juana; Jara-Seguel,Pedro.
Fissurella limbata (Sowerby, 1835), presenta un número cromosómico diploide 2n = 32 similar al descrito previamente para otras especies del género Fissurella Reeve 1849. El juego cromosómico haploide deF limbata tiene siete cromosomas metacéntricos, seis submetacéntricos y tres subtelocéntricos. Los cromosomas son pequeños y no exceden de 4,0 mm en longitud.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200015

Chronic Chagas disease: PCR-xenodiagnosis without previous microscopic observation is a useful tool to detect viable Trypanosoma cruzi
Provedor de dados: 48
Autores: Saavedra,Miguel; Zulantay,Inés; Apt,Werner; Martínez,Gabriela; Rojas,Antonio; Rodríguez,Jorge.
We evaluate the elimination of the microscopic stage of conventional xenodiagnosis (XD) to optimize the parasitological diagnosis of Trypanosoma cruzi in chronic Chagas disease. To this purpose we applied under informed consent two XD cages to 150 Chilean chronic chagasic patients. The fecal samples (FS) of the triatomines at 30, 60 and 90 days post feeding were divided into two parts: in one a microscopic search for mobile trypomastigote and/or epimastigote forms was performed. In the other part, DNA extraction-purification for PCR directed to the conserved region of kDNA minicircles of trypanosomes (PCR-XD), without previous microscopic observation was done. An XD was considered positive when at least one mobile T. cruzi parasite in any one of three...
Tipo: Journal article
Palavras-chave: Chronic Chagas disease; PCR; Triatoma infestans; Trypanosoma cruzi; Xenodiagnosis.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000300011

Chronic ethanol consumption in mice does not induce DNA damage in somatic or germ cells, evaluated by the bone marrow micronucleous assay and the dominant lethal mutation assay
Provedor de dados: 48
Autores: Ellahueñe,Manuel F; Pérez-Alzola,L Patricia; Olmedo,M Isabel.
Although alcohol is known to be a carcinogen for humans, ethanol-genotoxicity studies are incomplete. Ethanol seems not to be a bacterial mutagen, but the results are conflicting in rodent assays. We investigate the genotoxicity in the bone marrow micronucleus (MN) test and in the dominant lethal mutation (DLM) assay using two long-term ethanol exposure protocols. In the MN test, mice consumed three doses (5, 10 and 15% v/v) for 32 weeks. MN induction was compared to two control groups of 5- and 38-week-old mice (the ages of the treated mice when the treatment was initiated and when they were killed, respectively). For the three groups treated with ethanol there was no significant increase in MN induction as compared to the first control group, but...
Tipo: Journal article
Palavras-chave: Dominant lethal mutation; Ethanol; Genotoxicity; Micronucleus test.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000100004

Chronic Stress Effects on Adrenal Cortex Cellular Proliferation in Pregnant Rats
Provedor de dados: 77
Autores: Bozzo,Aída Andrea; Soñez,Carlos Alberto; Monedero Cobeta,Ignacio; Avila,Rodolfo; Rolando,Alicia Nélida; Romanini,María Cristina; Lazarte,Mario; Gauna,Héctor Fernando; Mugnaini,María Teresa.
Chronic stress by immobilization during pregnancy may cause alterations in mechanisms maintaining homeostasis in the adrenal gland. The objective of this study was to quantify cellular proliferation index in the adrenal cortex during pregnancy second half and assess the effects of chronic stress on it. Adrenal cortex proliferation index in stressed rats showed a significant decrease at 12 and 17 days of gestation, while at day 21 it did not show differences with the control treatments. Moreover, proliferation index of reticular zones in control and experimental rats, exhibited a significant reduction in comparison to glomerular and fascicular zones of adrenal cortex during the three gestation days studied. In conclusion, chronic stress by immobilization...
Tipo: Journal article
Palavras-chave: Chronic stress; Cellular proliferation; Adrenal cortex; Pregnancy.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400013

Chronic Stress Effects on NPY Neuronal Population During Rat Development
Provedor de dados: 77
Autores: Buljubacich,Karina Alejandra; Mugnaini,María Teresa; Soñez,Carlos Alberto; Rolando,Alicia Nélida; Romanini,María Cristina; Bozzo,Aída Andrea; Soñez,María Cristina; Gauna,Héctor Fernando.
The aim of this work was to determine the chronical stress effects on the encephalic NPY neurons population during the fetal Central nervous system development. Immunocytochemical techniques were used for this purpose: NPY neurons presented a similar morphology during the gestation days studied but their distribution varied in the anterior, medium and posterior brain. Statistical Highly significant differences in number of NPY positive neurons (p&lt;0.01) among anterior, medium and posterior brain of stressed fetus (SF) were determined depending on the gestation period and the brain area. The NPY neurons were increased in ARC (Arcuate Hypothalamic Nucleus), PH (Posterior Hypothalamic Area) and DM (Dorsomedial Hypothalamic Nucleus) in stressed fetuses (SF)...
Tipo: Journal article
Palavras-chave: NPY; Prenatal chronical stress; CNS; Rats.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300039

Chronic toxicity bioassay with populations of the crustacean Artemia salina exposed to the organophosphate diazinon
Provedor de dados: 48
Autores: Bustos-Obregon,Eduardo; Vargas,Álvaro.
A chronic toxicity bioassay was conducted with the microcrustacean Artemia salina as the testing organism for the toxic organophosphate diazinon in order to determine if the species is an appropriate indicator of pollution in aquatic environments. Tests of animal exposure to different concentrations of the toxicant were performed for 24, 48 and 72 hours after larvae hatching. Registered mortality data was used to obtain the lethal dose 50 (LD50) of the organophosphate for each exposure time, considering the immobilization of A. salina larvae as the mortality parameter. The lethal concentration (LD50) in the same exposure times was calculated by evaluating morphological changes on the three initial stages of larval development. Both doses were determined by...
Tipo: Journal article
Palavras-chave: Diazinon; Artemia salina; Ecotoxicology; Bioassay.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300013

Chronic Treatment with Ethanolic Extract of the Leavesof Azadirachta indica Ameliorates Lesions of Pancreatic Islets in Streptozotocin Diabetes
Provedor de dados: 77
Autores: Akinola,Oluwole B; Caxton-Martins,Ezekiel A; Dini,Luciana.
Botanical drugs are complementary therapies in the management of diabetes mellitus. In this work, we studied the effects of chronic treatment of diabetic rats with A. indica (neem) on blood glucose, pancreatic islet histopathology, and oxidative status of the pancreas. Fifty-four Wistar rats (5-8 weeks old) were randomly assigned to 5 treatment groups. Hyperglycemia was induced in 34 fasted rats with a single i.p. injection of STZ (70 mg/kg bw/d). Ethanolic extract of A. indica leaves (500 mg/kg bw/d) was given orally to diabetic rats (n=12) for 50d. Glibenclamide was given (p.o) at 600 µg/ kg bw/d. In each group, blood glucose, islet histopathology, and pancreatic oxidative status, were assessed. All hyperglycemic rats in the neem-treated group had become...
Tipo: Journal article
Palavras-chave: Azadirachta indica; Pancreatic islet lesion; Diabetes mellitus.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100043

Chronobiologic blood pressure assessment: Maturation of the daily rhythm in newborn foals
Provedor de dados: 48
Autores: PICCIONE,GIUSEPPE; ASSENZA,ANNA; FAZIO,FRANCESCO; GIANNETTO,CLAUDIA; CAOLA,GIOVANNI.
Circadian rhythmicity of physiological processes in animals has been described for some variables. In order to investigate the daily rhythmicity of blood pressure, seven foals (Equus caballus) were used for 40 days after birth. Measurements of blood pressure were done by means of an oscillometric apparatus (Argus TM-7, Schiller, Barr Switzerland) with the foals in a standing position and the cuff placed around the tail. Blood pressure was recorded twice a day, 1 hour before dawn and 1 hour before dusk for the first 10 days of life, every 2 days from the 11th to the 32nd day, on the 36th and on the 40th day. Two-way repeated measures analysis of variance (ANOVA) were used to determine statistically significant differences between the mean values recorded at...
Tipo: Journal article
Palavras-chave: Blood pressure; Circadian rhythm; Chronophisiology; Foals; Equus caballus.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000100007

Cicatrización en Quemaduras Tipo AB-B en Conejillo de Indias (Cavia porcellus) Utilizando Miel de Ulmo Asociada a Vitamina C Oral
Provedor de dados: 77
Autores: Schencke,Carolina; Salvo,Jessica; Veuthey,Carlos; Hidalgo,Alejandra; del Sol,Mariano.
En los últimos años se ha incrementado el interés por el uso de terapias alternativas para la curación de heridas. La miel de abeja es una antigua medicina natural que ha sido utilizada en el tratamiento de heridas y úlceras, mientras la vitamina C mejora la barrera epidérmica y reduce la contracción de heridas. Este estudio pretende avalar el tratamiento con miel asociada a vitamina C oral como curación alternativa y eficiente en quemaduras tipo AB-B. Se utilizaron 12 cuyes (Cavia porcellus). Los animales se distribuyeron en grupos A (sin Vitamina C) y B (con Vitamina C). Bajo efectos anestésicos se provocó una quemadura de 1.7 mm de diámetro en la región dorsal derecha, que fue tratada con curaciones con miel. Al mismo tiempo, se provocó una quemadura de...
Tipo: Journal article
Palavras-chave: Quemaduras; Miel; Vitamina C; Conejillo de Indias.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100011

CICLO DE VIDA DE DERO (AULOPHORUS) COSTATUS MARCUS, 1944 (TUBIFICIDAE, OLIGOCHAETA) EN UN CUERPO DE AGUA CON VEGETACION FLOTANTE EN LOS TALAS, ARGENTINA
Provedor de dados: 72
Autores: Armendáriz,Laura C.
Se estudió el ciclo de vida (marzo de 1996-marzo de 1997) de Dero (Aulophorus) costatus en un cuerpo de agua vegetado de la localidad de Los Talas, Argentina. Fue el naidíneo dominante en el ambiente estudiado al modificarse la cobertura vegetal _desarrollándose Azolla sp_ y desplazando la población de Allonais lairdi. Se colectaron individuos inmaduros, maduros y en reproducción asexual formando cadenas de dos zooides. Se registraron medidas de longitud, peso húmedo y peso seco (a 65 °C, 24 h) de los organismos. La disposición espacial de los individuos, analizada mediante el Indice de Morisita, presentó una distribución al azar. La densidad poblacional presentó una gran fluctuación (1,58 a 101,97 ind./g.d.w.vegetal.m²) debido a la reproducción de tipo...
Tipo: Journal article
Palavras-chave: Naidinae; Población; Reproducción.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100004

Ciclo Vital de Adalia angulifera Mulsant (Coleoptera: Coccinellidae) Sobre el Pulgón del Avellano Europeo Myzocallis coryli (Goeze) (Hemiptera: Aphididae)
Provedor de dados: 113
Autores: Aguilera P,Alfonso; Rebolledo R,Ramón; Klein K,Carlos.
Adalia angulifera Mulsant es un coccinélido depredador habitual del pulgón Myzocallis coryli (Goeze), que es específico del avellano europeo, Corylus avellana L., en La Araucanía, Chile. El ciclo vital se estudió en el Centro Regional de Investigación Carillanca del Instituto de Investigaciones Agropecuarias (INIA), Temuco, Chile (38º41’ lat. Sur; 72º25’ long. Oeste; 200 msnm). Coccinélidos y áfidos fueron criados en laboratorio a 19,23 ± 2,71ºC; 60,78 ± 3,34% de humedad relativa y fotoperíodo variable de 14 a 16 h de luz natural, desde octubre a noviembre. En estas condiciones, el ciclo vital de A. angulifera se cumplió en 37,39 ±1,55 días con un rango entre 24 y 59 días. El huevo representó un 18% del ciclo, la larva un 58,3% y la pupa el 23,7%. También...
Tipo: Journal article
Palavras-chave: Coccinélido; Áfido; Avellano europeo.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000300010

CIENCIA, VINO Y SALUD
Provedor de dados: 48
Autores: Leighton,F.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200001

Ciencia y Educación: Una tarea pendiente
Provedor de dados: 48
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000100001

Ciencia y Política
Provedor de dados: 48
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000100001

Ciliary Neurotrophic Factor (CNTF) affects the excitable and contractile properties of innervated skeletal muscles
Provedor de dados: 48
Autores: RAMIREZ,BEATRIZ U; RETAMAL,LEIRA; VERGARA,CECILIA.
The well-established trophic role of CNTF upon neurons led to performing clinical trials in patients of neurodegenerative diseases. However, trials were suspended due to side effects such as severe weight loss, hyperalgesia, coughing, muscle cramps and pain. So far it is not known how CNTF triggers the problems related to skeletal muscle cramps and pain. CNTF has also been described as a myotrophic factor for denervated skeletal muscles, but the possibility that it affects innervated muscles has also been considered. Since a myotrophic factor could be a valuable tool for treatment of several muscle diseases, we studied the effects of low doses of CNTF delivered systemically by an osmotic pump, over the electrical and mechanical properties of innervated and...
Tipo: Journal article
Palavras-chave: CNTF; Contraction and relaxation time; Denervation; EMG; Fibrillation; Skeletal muscle.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000300003

CINCO NUEVOS REGISTROS DE LIQUENES MARINOS PARA CHILE
Provedor de dados: 73
Autores: Pereira,Iris; Torres,Waleska.
Cinco especies de líquenes marinos son documentadas por primera vez en Chile: Arthopyrenia saxicola Massal., Caloplaca carphinea (Fr.) Jatta, C. thallincola (Wedd.) Du Rietz, Pertusaria rupicola (Fr.) Harm. y Xanthoria ectaneoides (Nyl.) Zahlbr. Dichos taxones fueron hallados en la Bahía de Constitución, Chile Central. Para cada taxón, se entrega una descripción basada en el material estudiado consistente en la morfología externa del talo y las características morfológicas internas de las estructuras reproductoras de cada especie. También se incluyen las reacciones químicas del talo y de algunas estructuras reproductoras, cuando el taxón lo amerita. Además se adjuntan fotografías a color de los talos de las especies estudiadas
Tipo: Journal article
Palavras-chave: Chile Central; Litoral costero; Orilla rocosa.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100004

CINCO NUEVOS REGISTROS PARA LA FLORA VASCULAR DE CHILE CONTINENTAL
Provedor de dados: 73
Autores: García,Nicolás.
Se dan a conocer cinco nuevos registros para la flora vascular de Chile continental, correspondientes a Adesmia hemisphaerica Hauman (Fabaceae), Carex argentina Barros (Cyperaceae), Luzula parvula Barros (Juncaceae), Oxychloë bisexualis Kuntze y Oxychloë haumaniana (Barros) Barros (Juncaceae). Para cada taxón se señala iconografía específica, distribución geográfica y ambiental, y comentarios taxonómicos. Se discuten algunos aspectos fitogeográficos con base en dichas novedades florísticas
Tipo: Journal article
Palavras-chave: Adesmia; Carex; Luzula; Oxychloë; Taxonomía; Fitogeografía.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200003

Cinnamic acid, ethanol and temperature interaction on coumarate decarboxylase activity and the relative expression of the putative cd gene in D. bruxellensis
Provedor de dados: 69
Autores: Ganga,María Angélica; Salinas,Francisco; Ravanal,Cristina; García,Verónica; Carrasco,Carolina; Martínez,Claudio; Saavedra,Jorge.
Dekkera bruxellensis is one of the main contaminating yeasts in wine due to its ability to metabolize cinnamic acids into volatile phenols. This yeast metabolizes p-coumaric acid into 4-vinylphenol through a coumarate decarboxylase (CD) and then transforms it into to 4-ethylphenol (EF) through a vinylphenol reductase. In this work we investigated the influence of the interaction between the concentration of p-coumaric acid, ferulic acid and ethanol as well as growth temperature on the production of CD activity and the expression of a putative gene that codes for this enzymatic activity. For this, a Box Behnken experimental design was used. The concentration of p-coumaric acid (5-26 ppm) and ferulic acid (3-9 ppm) alone did not show any significant effect...
Tipo: Journal article
Palavras-chave: Dekkera/Brettanomyces; Cinnamic acids; Coumarate decarboxylase; Off-flavours; Wine.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500002

Circadian chronotypes among wild-captured west Andean octodontids
Provedor de dados: 48
Autores: OCAMPO-GARCÉS,ADRIÁN; MENA,WILSON; HERNÁNDEZ,FELIPE; CORTÉS,NELSON; PALACIOS,ADRIÁN G.
Rest activity pattern was studied in wild-captured males of Octodon degus (n=9), Octodon bridgesi (n=3), and Spalacopus cyanus (n=6) (Rodentia: Octodontidae). Ten-minute resolution actograms were constructed from data obtained by an automated acquisition system. After two months of habituation to a stable light-dark schedule, recordings were performed in isolation chambers under a 12: 12 Light Dark schedule. A free-running period (constant darkness) was recorded for O. bridgesi and S. cyanus. O. degus displayed a crepuscular pattern of rest activity rhythm. Entrained O. bridgesi and S. cyanus displayed nocturnal preference, with rest anticipating light phase and without crepuscular activity bouts. Under constant darkness, active phase occurred at...
Tipo: Journal article
Palavras-chave: Circadian rhythms; Chronotype; Octodon; Octodontids; Spalacopus cyanus.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200003

Circuito Venoso Cervical de la Llama (Lama glama)
Provedor de dados: 77
Autores: Arzone,Carlos Alberto; Sánchez,Gabriel Alejandro; Vidal Figueredo,Ramiro; Acerbo,Marcelo; Pellegrino,Fernando Carlos.
La particular estructura de la región cervical de la llama (Lama glama) se traduce en numerosas diferencias anátomo-funcionales respecto de otros mamíferos domésticos. Entre ellas merece destacarse un distintivo circuito venoso, cuya descripción es el objetivo de este trabajo. Para el presente estudio, se utilizaron diez llamas, machos, adultos y de aptitud lanera. Para resaltar las venas del cuello se procedió a la repleción de las mismas y, posteriormente, se disecaron los vasos utilizando técnicas e instrumental convencional. Se describe la morfología particular de un circuito venoso, en el cual las venas yugular externa, vertebral e intervertebrales son las principales protagonistas. El hecho destacado radica en las anastomosis establecidas entre las...
Tipo: Journal article
Palavras-chave: Venas cervicales; Anatomía Veterinaria; Camélidos sudamericanos.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400012

Cisgenesis and Intragenesis: New tools For Improving Crops
Provedor de dados: 48
Autores: Espinoza,C; Schlechter,R; Herrera,D; Torres,E; Serrano,A; Medina,C; Arce-Johnson,P.
Genetically Modified Organisms (GMO) could be the answer for many relevant problems affecting crops. However, improving crops through GMO is also often associated with safety concerns, environmental risks and health issues due to the presence of foreign DNA. These limitations have prompted the development of alternative technologies. Recently, cisgenesis and intragenesis have been developed as new tools aimed to modify crops. While cisgenesis involves genetic modification using a complete copy of natural genes with their regulatory elements that belong exclusively to sexually compatible plants, intragenesis refers to the transference of new combinations of genes and regulatory sequences belonging to that particular species. So far, application of...
Tipo: Journal article
Palavras-chave: Cisgenesis; Intragenesis; Grapevine promoters; VvGRIP24.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400003

Citología y Análisis Morfométrico de las Células del Epitelio Vaginal Durante el Ciclo Estral en Ovejas de Pelo (Ovis aries)
Provedor de dados: 77
Autores: Clemente Ovando,Neftali; Orihuela Trujillo,Agustín; Flores Pérez,Fernando Iván; Aguirre Flores,Virginio.
La citología vaginal puede usarse para caracterizar estados del ciclo reproductivo de la hembra. Sin embargo, no ha sido validada en ovinos de pelo, y ofrece resultados inexactos debido a interpretaciones subjetivas. El objetivo del presente trabajo es tipificar las características morfológicas y morfométricas de las células epiteliales de la vagina durante el ciclo estral en ovinos de pelo. Cinco borregas Santa Cruz se sincronizaron con esponjas intravaginales. Desde el día del 1er celo posterior al retiro de la esponja y hasta el siguiente celo, se obtuvieron muestras diarias del epitelio vaginal de cada oveja, y se cuantificó el número de células parabasales, intermedias y superficiales, y se midió la longitud, perímetro y área de citoplasma y núcleo de...
Tipo: Journal article
Palavras-chave: Epitelio vaginal; Citología; Ciclo estral; Ovinos de pelo; Santa Cruz.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300017

Citric acid fermentation by mutant strain of Aspergillus niger GCMC-7using molasses based medium
Provedor de dados: 69
Autores: ul-Haq,Ikram; Ali,Sikander; Qadeer,M.A.; Iqbal,Javed.
Citric acid fermentation of cane-molasses by submerged fermentation in 15 L stirred fermentor (working volume 9 L) was carried out. A hyper mutant strain of Aspergillus niger GCMC-7 was used in the present study which was obtained from the culture collection of our own labs. Ferrocyanide treated molasses [K4Fe(CN)6 200 ppm] medium containing sugar 150 g/l was employed as the basal fermentation medium. Different cultural conditions such as incubation temperature (30ºC), initial pH (6.0), air supply (1.0 l-1l-1min), agitation intensity (200 rpm) and time profile (144 h after inoculation) were optimised for enhanced citric acid production. Maximum amount of anhydrous citric acid obtained during the course of study was 106.65 g/l, with a sugar consumption of...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200007

Citric acid production from glucose by yeast Candida oleophila ATCC 20177 under batch, continuous and repeated batch cultivation
Provedor de dados: 69
Autores: Anastassiadis,Savas; Rehm,Hans-Jürgen.
The effect of air saturation on citric acid production in batch, repeated batch and chemostat cultures has been studied. It was shown that, under continuous fermentation (chemostat mode), the highest concentration of citric acid equal of 98 g/l was produced at 20% of air saturation. In contrary to continuous fermentation, displaying an optimum at 20%, 80% air saturation yielded higher values in repeated batch fermentation process. 167 g/l citric acid were produced continuously with the fill and drain technique at 4.85 days, at 80% air saturation, compared with 157.6 g/l achieved within 5.4 days at 20%. Under repeated batch fermentation, the formation rate of the generic product (Rj) as well as the specific citric acid productivity (m p) reached a maximum...
Tipo: Journal article
Palavras-chave: Air saturation influence; Chemostat; Citric acid; Citric acid fermentation; Repeated batch; Oxygen influence.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100005

CLASIFICACION Y CARACTERIZACION DE LA FLORA Y VEGETACION DE LOS HUMEDALES DE LA COSTA DE TOLTEN (IX REGION, CHILE)
Provedor de dados: 73
Autores: Hauenstein,Enrique; González,Marcos; Peña-Cortés,Fernando; Muñoz-Pedreros,Andrés.
Programas de drenado ponen en serio peligro la permanencia de los humedales de Chile. Sin embargo, la flora y vegetación de estos ecosistemas han sido poco estudiadas. Este estudio clasifica los humedales de la costa de Toltén (IX Región, Chile), determinando su flora y vegetación. De acuerdo a la clasificación de la Convención de Ramsar, se determinaron 5 tipos de humedales en el área: lagunas costeras de agua dulce, ríos y arroyos permanentes, pantanos permanentes de agua dulce, pantanos estacionales de agua dulce y humedal boscoso de agua dulce (bosque pantanoso). Se trabajó con 39 censos de vegetación de acuerdo a la metodología fitosociológica de la Escuela Zürich-Montpellier, y recolecciones al azar. La flora vascular está formada por 84 especies, en...
Tipo: Journal article
Palavras-chave: Asociación; Flora; Humedales; Macrófitos; Vegetación.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000200006

Classification and Analysis of Fifth Pair of Sacral Foramina in Indian Dry Sacra
Provedor de dados: 77
Autores: Singh,Rajani.
A sacrum with five pairs of foramina is an anatomical variant resulting from sacralisation of lumbar vertebra at cranial end or sacralisation of coccyx vertebra at caudal end. An unusual gross variation nurtures interest of anatomists and causes concern for clinicians when it mimics pathology. A sacrum with fifth anomalous pair of sacral foramina has been observed which prompted the author to examine the available sacra in the osteology lab of Department of Anatomy KG Medical University Lucknow, UP, India. Of the total sixty six observed sacra, those with five pairs of sacral foramina due to sacralisation of lumbar vertebra were found in eleven cases (16.6%) while those due to sacralisation of coccygeal vertebra were observed in nine cases (13.6%). These...
Tipo: Journal article
Palavras-chave: Caudal block; Coccyx; Sacral foramen; Sacrum; Vertebra.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100021

Classification and Fascicular Analysis of Variant Branching Pattern of Femoral Nerve for Microsurgical Intervention: A Series of Thirteen Cadavers
Provedor de dados: 77
Autores: Singh,Rajani; Tubbs,Shane; Singla,Mukesh.
Femoral neuropathy associated with lower limb is treated by surgical intervention through activation/regeneration/grafting of nerve fibers by a nerve cuff electrode implant or neuro-prosthesis. These procedures require detailed and precise knowledge of neuro-anatomical variants of the femoral nerve and its fascicular anatomy so that the nerve injury can be investigated and treated more efficiently. The aim of the study is to uncover the variations both in the femoral nerve and its branches, to classify them and to bring out corresponding fascicular anatomy using a hypothesis based on the principle of consistency, continuity and traceability of fascicles. The study was carried out in the Department of Anatomy AIIMS Rishikesh using 13 matched lower limbs (26...
Tipo: Journal article
Palavras-chave: Variations of femoral branching pattern; Classification of femoral nerve; Fascicular model; Nerve cuff electrode; Femoral neuropathy.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200024

Classification methods for ongoing EEG and MEG signals
Provedor de dados: 48
Autores: BESSERVE,MICHEL; JERBI,KARIM; LAURENT,FRANCOIS; BAILLET,SYLVAIN; MARTINERIE,JACQUES; GARNERO,LINE.
Classification algorithms help predict the qualitative properties of a subject's mental state by extracting useful information from the highly multivariate non-invasive recordings of his brain activity. In particular, applying them to Magneto-encephalography (MEG) and electro-encephalography (EEG) is a challenging and promising task with prominent practical applications to e.g. Brain Computer Interface (BCI). In this paper, we first review the principles of the major classification techniques and discuss their application to MEG and EEG data classification. Next, we investigate the behavior of classification methods using real data recorded during a MEG visuomotor experiment. In particular, we study the influence of the classification algorithm, of the...
Tipo: Journal article
Palavras-chave: Brain computer interface; Electroencephalography; Magnetoencephalography; Visuomotor control; Support Vector Machine.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000500005

Classification of areas associated with soybean yield and agrometeorological variables through fuzzy clustering
Provedor de dados: 118
Autores: Coimbra de Araújo,Everton; Johann,Jerry A; Uribe-Opazo,Miguel A; Camargo,Eduardo C.G.
E.C. Araújo, J.A. Johann, M.A. Uribe-Opazo, and E.C.G. Camargo. 2013. Classification of areas associated with soybean yield and agrometeorological variables through fuzzy clustering. Cien. Inv. Agr. 40(3): 617-627. This study aimed to apply an approach based on fuzzy clustering for the classification of areas associated with soybean yield combined with the following agrometeorological variables: rainfall, average air temperature and average global solar radiation. The study was conducted with 48 municipalities in the western region of Paraná State, Brazil, with data from the crop-year 2007/2008. Through the fuzzy c-means algorithm, it was possible to form groups of municipalities that were similar in soybean yield using the Method of Decision by the Higher...
Tipo: Journal article
Palavras-chave: Agrometeorological variables; Classification of areas; Fuzzy c-Means; Methods of decision; Similarity index; Soybean yield.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000300014

Classification of some Linseed (Linum usitatissimum L.) Genotypes for Salinity Tolerance using Germination, Seedling Growth, and Ion Content
Provedor de dados: 117
Autores: Demir Kaya,Mehmet; Day,Sibel; Cikili,Yakup; Arslan,Neset.
Salinity reduces germination, delays emergence, and inhibits seedling growth of linseed (Linum usitatissimum L.) while some varieties are less affected by salinity than others. In this study, we aimed to determine the effects of NaCl levels (0, 5, 10, 20 and 30 dS m-1) on germination and seedling growth of 10 linseed genotypes (lines 87, 89, 104, 114, 193, 194, 209, 215, C-90 and cv. San-85) and to classify the genotypes for salinity tolerance using germination and seedling characteristics. Germination percentage, mean germination time, root and shoot length, seedling fresh and dry weight, Na+ content and Na:K ratio of seedlings were investigated. Classification of linseed genotypes for salinity tolerance was done according to (i) combination of Principal...
Tipo: Journal article
Palavras-chave: NaCl; Tolerance; Cluster; Ion accumulation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100005

CLASSIFYING TROPICAL CYCLONES WITH UNDERWATER SOUND
Provedor de dados: 72
Autores: Makris,Nicholas C.; Wilson,Joshua D.
Theoretical and empirical evidence are synthesized to show that underwater acoustic sensing techniques may provide a valuable tool for measuring the wind speed and determining the destructive power of a hurricane.This is done by first developing a model for the acoustic intensity and mutual intensity in an ocean waveguide due to a hurricane and then determining the relationship between local wind speed and underwater acoustic intensity. From this it is shown that it should be feasible to accurately measure the local wind speed and classify the destructive power of a hurricane with a single underwater acoustic sensor.The potential advantages and disadvantages of the proposed acoustic method are weighed against those of currently employed techniques
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300010

CLAVE TAXONOMICA, ACTUALIZADA, ILUSTRADA Y COMENTADA DE LOS PECES DE LA FAMILIA LABRISOMIDAE DE CHILE (PERCIFORMES, BLENNIOIDEI)
Provedor de dados: 72
Autores: Sáez,Sylvia; Pequeño,Germán.
Se presenta una clave taxonómica para los integrantes de la familia Labrisomidae de Chile. Dicho taxón está conformado actualmente por Auchenionchus crinitus (Jenyns, 1842), A. microcirrhis (Valenciennes, 1836), A. variolosus (Valenciennes, 1836), Calliclinus geniguttatus (Valenciennes, 183 6), C. nudiventris Cervigón &amp;amp; Pequeño, 1979 y Labrisomus (Labrisomus) philippii (Steindachner, 1866). Esta familia ha sido objeto de diversos cambios taxonómicos por parcialidades, lo cual ha dificultando su visión de conjunto, no sólo por la falta de un documento que unifique estas modificaciones, sino también por la similitud corporal que presentan sus taxa componentes. La presente clave reúne las modificaciones ocurridas y comenta los diferentes cambios...
Tipo: Journal article
Palavras-chave: Peces litorales; Reconocimiento; Taxonomía; Chile.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100016

Cleidocranial Dysplasia: A Case Report
Provedor de dados: 77
Autores: Alves,Nilton; Oliveira,Reinaldo de.
The cleidocranial dysplasia is a rare disease which can occur either spontaneously or by a dominant autosomal inheritance, with no predilection of genre or ethnic group. The odontologist is, most of the times, the first professional who patients look for to solve the problem, since there is a delay in the eruption and /or an absence of permanent teeth. In the case related in this work, this was the reason why the patient looked for treatment. Many others odontological problems are also present in this syndrome, such as, supernumerary teeth, retained teeth, with shape deviation and absence of deciduous teeth resorption. The premature diagnosis allows a proper orientation for the treatment, offering a better life quality for the patient.
Tipo: Journal article
Palavras-chave: Cleidocranial dysplasia; Dysostosis; Dentofacial deviation.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400043

CLIMATOLOGIES OF OZONE AND UV-B IRRADIANCES OVER ANTARCTICA IN THE LAST DECADES
Provedor de dados: 72
Autores: Diaz,Susana B; Deferrari,Guillermo; Nelson,Don; Camilion,M. Carolina.
Antarctica is the continent that has suffered the strongest variations in total ozone column and UV-B radiation, during the last decades, as consequence of the "ozone hole". Systematic measurements of total ozone column are being performed since the late 1950s at ground stations, and global coverage is available since the late 1970s, with measurements provided by instruments installed at different satellites (Nimbus-7, Meteor-3, Adeos, Earth-Probe, Gome). In 1988, the National Science Foundation (US) initiated the activities of the NSF UV Radiation Monitoring Network, installing three spectro-radiometers SUV-100/BSI in South Pole, Mc Murdo and Palmer Stations, and one in Ushuaia. Now, a time series of more than ten years is available for all stations....
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200029

CLIMATOLOGY AND INTERANNUAL VARIABILITY OF INTERTROPICAL CONVERGENCE ZONE IN THE EASTERN PACIFIC
Provedor de dados: 72
Autores: Garcés-Vargas,José; Abarca del Río,Rodrigo; Schneider,Wolfgang.
Characteristics of the Intertropical Convergence Zone (ITCZ) in the eastern Pacific are derived from the monthly mean wind convergence of ERS-QuikSCAT fields for 1991-2004. Its climatology is computed over 1999-2004, and compared with those derived from monthly sea surface temperature, atmospheric water vapor, cloud liquid water, and rain rate from the Tropical Rain Measuring Mission (TRMM, 1999-2004). Preliminary results indicated an excellent relationship between wind convergence and TRMM data for the northern branch of ITCZ (NITCZ). However, none of the TRMM fields show, as the ERS-QuikSCAT fields does the southern branch of ITCZ (SITCZ). Therefore, an especial emphasis is given over SITCZ, for instance only shown in wind convergence, with a permanent...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200039

Clinical Anatomy of the Head Region of the Black Bengal Goat in Bangladesh
Provedor de dados: 77
Autores: Uddin,Mohammad Mejbah; Ahmed,Syed Sayeem Uddin; Islam,Kh. Nurul; Islam,Md. Mominul.
The study involved the measurements of some clinically important landmarks for regional anesthesia in the maxillary and mandibular regions of head of fifty Black Bengal (BB) goats. The distance from facial tuberosity to the infra-orbital canal and from the latter to the root of the alveolar tooth directly ventral to it were 1.85 cm and 1.75 cm respectively. Both the distances from facial tuberosity to infra-orbital canal and from infra-orbital canal to the root of the alveolar tooth are of clinical important even in live animal as a guide for tracking infra-orbital nerve because of facial tuberosity. The distance between the lateral end of the alveolus of the incisor tooth to the mental foramen was 2.11 cm and are from the mental foramen to the caudal...
Tipo: Journal article
Palavras-chave: Mandible; Maxilla; Regional Anesthesia; Goat.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400048

Clinical and experimental approaches to knee cartilage lesion repair and mesenchymal stem cell chondrocyte differentiation
Provedor de dados: 48
Autores: Montoya,Fredy; Martínez,Fernando; García-Robles,María; Balmaceda-Aguilera,Carolina; Koch,Ximena; Rodríguez,Federico; Silva-Álvarez,Carmen; Salazar,Katterine; Ulloa,Viviana; Nualart,Francisco.
Cartilage has poor regeneration capacity due to the scarcity of endogenous stem cells, its low metabolic activity and the avascular environment. Repair strategies vary widely, including microfracture, autologous or allogenic tissue implantation, and in vitro engineered tissues of autologous origin. However, unlike the advances that have been made over more than two decades with more complex organs, including vascular, cardiac or bone tissues, similar advances in tissue engineering for cartilage repair are lacking. Although the inherent characteristics of cartilage tissue, such as the lack of vascularity and low cellular diversity, suggest that it would be one of the more simple tissues to be engineered, its functional weight-bearing role and implant...
Tipo: Journal article
Palavras-chave: Cartilage; Lesion; Microfracture; Stem cells.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400015

Clinical and Functional Significance of Accessory Brachialis Muscle: An Unique Anatomical Variant
Provedor de dados: 77
Autores: Sirisinagandla,Sreenivasa Rao; Potu,Bhagath Kumar.
A thorough knowledge of the variations in the patterns of muscle insertion and the consequent neurovascular entrapment due to them is important for orthopedic and plastic surgeons. During routine dissection, we encountered a unique occurrence of an accessory brachialis muscle (acBr) blending with the medial aspect of bicipital aponeurosis in the cubital fossa. It also entrapped the median nerve and brachial artery due to its superficial position. The abnormality reported here might result in neurovascular compression symptoms in the upper limb and possible mechanical advantages or disadvantage in the flexion of elbow joint. To the best of our knowledge, the brachialis variant insertion we present here is rare in the list of its anomalies. We also discuss...
Tipo: Journal article
Palavras-chave: Accessory brachialis; Variation; Neurovascular compression.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400037

Clinical and Histochemical Alterations of the Periodontal Ligament in Gerbils after Malocclusion Induced
Provedor de dados: 77
Autores: Naves,Leandro Moura Leite; Issa,João Paulo Mardegan; Pitol,Dimitrius Leonardo; Fukada,Sandra Yasuyo; di Matteo,Miguel Ángel Sala; Iyomasa,Mamie Mizusaki.
The aim of this article is to show the clinical and histochemical alterations of the first periodontal ligament, on the right side, after upper molars teeth extraction on the left side in gerbils. After two months, the periodontal ligaments were removed and processed for histochemical analysis. The data showed that TRAP reaction was able to evidence the osteoclastic activity in the hyperfunction hemimandible, right side, explaining the functional changes in the periodontal ligament after teeth extraction, and a little gingival recession and radicular exposure of teeth without function was observed at inferior molars of the left side
Tipo: Journal article
Palavras-chave: Periodontal ligament; Histochemistry; Malocclusion; Gerbil; Meriones unguiculatus.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400036

Clinical Evaluation of Fibularis Tertius Muscle Prevalence
Provedor de dados: 77
Autores: Ramirez,Daysi; Gajardo,Carolina; Caballero,Paula; Zavando,Daniela; Cantín,Mario; Suazo Galdames,Iván.
The fibularis tertius muscle (FTM) in man has been developed over time to acquire subsequent bipedal gait. The FTM functions as a crucial contributor in dorsiflexion and eversion, postulated over the years as a stabilizer of the talocrural joint, avoiding forced investment and protecting the anterior talofibular ligament. The literature describes that FTM is absent in 10% of cases, with no data on Chilean population. A study of surface anatomy in 168 young subjects, 60% female and 40% male students at the Universidad de Talca, Chile, with a mean age of 20.6 ± 1.68 years, was conducted. The presence of FTM was identified following the implementation of a clinical assessment protocol that determines the presence of muscle on the basis of a progression called...
Tipo: Journal article
Palavras-chave: Fibularis tertius muscle; Talocrural Joint; Leg; Anterior talofibular ligament.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300016

Clinical Significance of Maxillary Artery and its Branches: A Cadaver Study and Review of the Literature
Provedor de dados: 77
Autores: Uysal,Ismihan Ilknur; Buyukmumcu,Mustafa; Dogan,Nadire Unver; Seker,Muzaffer; Ziylan,Taner.
The aim of this study was to investigate the anatomy of the maxillary artery (MA) and its branches. Fourteen sides of Turkish adult cadavers were dissected. The specimens were classified according to the relation between MA and the lateral pterygoid. After the removal of the lateral pterygoid, parts and branches of MA were exposed. We classified the branching patterns of MA in the pterygopalatine fossa. The calibers and lengths of the arteries, and the distance between the zygomatic arch and MA, and between the infratemporal crest and MA were measured. The MA was found superficial to the lateral pterygoid in 57.2%. The inferior alveolar artery (IA) was arisen from MA before the middle meningeal artery (MM) in 35.7%, after MM in 35.7%. The IA and MM were...
Tipo: Journal article
Palavras-chave: Maxillar artery; Inferior alveolar artery; Middle meningeal artery; Human cadaver.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400034

Clinico-Radiographic Examination of Odontogenic Myxoma with Displacement of Unerupted Upper Third Molar: Review of the Literature
Provedor de dados: 77
Autores: Altug,Hasan Ayberk; Gulses,Aydin; Sencimen,Metin.
Odotogenic myxoma is a benign tumor which presents in 3% to 6% of all odontogenic tumors. According to the WHO classification, multiple radiolucent areas of varying size, separated by straight or curved bony septa with poorly defined borders are the radiologic characteristics of the condition. We report the case of maxillary odontogenic myxoma in a 21 year old man. The radiological feature of the current case was interesting, due to the size of the lesion and severe displacement of the upper third molar.
Tipo: Journal article
Palavras-chave: Odontogenic myxoma; Orthopantomography; Computed tomography; Magnetic resonance imaging; Impacted molar; Cyst.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300045

CLONACIÓN, PRODUCCIÓN DE QUIMERAS Y CÉLULAS PLURIPOTENCIALES
Provedor de dados: 77
Autores: Rojas,Mariana; Venegas,Felipe; Servey,Jean Luc; Guillomot,Michel.
La Biología del Desarrollo y la Biotecnología han avanzado enormemente en los últimos años. Los estudios que se están realizando actualmente con nuevas técnicas moleculares, nos conducen a una nueva era en el diagnóstico y en el tratamiento de muchas enfermedades congénitas. Actualmente, se ha logrado aplicar los conocimientos derivados de ella, con incipiente éxito, en los aspectos productivos y también en la terapia de distintas enfermedades del Hombre y de otros animales y, por último, existen importantes perspectivas en la protección de especies amenazadas. En este Review, se analizan algunos de los aspectos técnicos más interesantes de la clonación, producción de quimeras y obtención de células pluripotenciales, como también los objetivos y...
Tipo: Journal article
Palavras-chave: Clonación; Quimeras; Células pluripotenciales.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400018

Clonal diversity and antimicrobial resistance of Enterococcus faecalis isolated from endodontic infections
Provedor de dados: 69
Autores: Suliman Al-Badah,Abdulhakim; S.S. Ibrahim,Abdelnasser; Al-Salamah,Ali A; Ibrahim,Shebl Salah S.
Background Enterococcus faecalis is considered to be one of most prevalent species in the oral cavity, particularly in endodontic infections. The aim of the present study was to investigate the prevalence of E. faecalis in dental root canals, clonal diversity by restriction fragment length polymorphism (RFLP) and randomly amplified polymorphic DNA (RAPD-PCR) analysis, and the antibiotic susceptibility of E. faecalis isolates. Results Among the bacterial strains isolated from dental root canal specimens (n = 82), E. faecalis was determined to have the highest prevalence followed by Streptococcus viridians, Leuconostoc mesenteroides, Staphylococcus aureus, Streptococcus mitis, and Pediococcus pentosaceus. Cluster analysis of RAPD-PCR and RFLP patterns of the...
Tipo: Journal article
Palavras-chave: Antimicrobial susceptibility; Endodontic infection; Enterococcus faecalis; Genotype; RAPD; RFLP.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300006

Clonal propagation of the avocado: effects of the rooting step on graft union formation and development
Provedor de dados: 118
Autores: Estay,Carmen; Cautín,Ricardo; Neaman,Alexander; Castro,Monica.
The etiolation and layering technique that is used on avocados has two critical steps, namely, the rooting of clonal rootstock and graft union formation between the commercial variety and clonal rootstock. This study analyzed the rooting step of the clonal rootstock regarding its influence on graft union formation and development. The optimum times for grafting the commercial variety onto clonal avocado rootstock were determined under two greenhouse conditions, heating and no heating. The results showed that under greenhouse conditions without heating, there was higher survival (%) in plants that were grafted 60 days after the rooting steps in the clonal scion, and, in the experiments in a heated greenhouse, the highest survival rate (%) was observed in...
Tipo: Journal article
Palavras-chave: Grafting; Histological cross section; Persea americana Mill; Rhizogenesis.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200006

Cloning and analysis of a NBS-LRR disease resistance gene candidate PnAG1 from peanut (Arachis hypogaea L.)
Provedor de dados: 69
Autores: Shan,Shi-hua; Zhang,Ting-ting; Li,Chun-juan; Yang,Chen; Yan,Cai-xia; Wan,Shu-bo.
Background: Based on the conserved sequences of a known NBS resistance gene, a pair of degenerate primers was designed to amplify the NBS-LRR resistance gene from peanut using PCR and RACE methods. Results: Analyzing the amino acid sequence by BLAST on NCBI, which was deduced from the 1088bp-long gene named PnAG1-2, showed that it had a certain homology with some resistance proteins, among which Arachis cardenasii resistance protein gene had the highest homology (66%). Relative quantification PCR analysis indicated that PnAG1-2 gene expresses more in J11 (an A. flavus-resistant variety) than in JH1012 (an A. flavus-susceptible variety) when the harvest time was coming. Conclusions: In this study, the NBS-LRR resistance sequence was successfully cloned from...
Tipo: Journal article
Palavras-chave: Bioinformatics; NBS-LRR; Peanut; Real-time fluorescence quantitative PCR.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600006

Cloning and characterization of resistance gene analogs from under-exploited plant species
Provedor de dados: 69
Autores: Thirumalaiandi,Ramasubramanian; Selvaraj,Michael Gomez; Rajasekaran,Raghu; Subbarayalu,Mohankumar.
Genomic DNA sequences sharing homology with NBS region of resistance gene analogs were isolated and characterized from Pongamia glabra, Adenanthera pavonina, Clitoria ternatea and Solanum trilobatum using PCR based approach with primers designed from conserved regions of NBS domain. The presence of consensus motifs viz., kinase 1a, kinase 2, kinase 3a and hydrophobic domain provided evidence that the cloned sequences may belong to the NBS-LRR gene family. Conservation of tryptophan as the last residue of kinase-2 motif further confirms their position in non-TIR NBS-LRR family of resistance genes. The Resistance Gene Analogs (RGAs) cloned from P. glabra, A. pavonina, C. ternatea and S. trilobatum clustered together with well- characterized non-TIR-NBS-LRR...
Tipo: Journal article
Palavras-chave: Adenanthera pavonina; Clitoria ternatea; NBS-LRR; Pongamia glabra; Resistance gene analogs; Solanum trilobatum.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400004

Cloning and chloroplast-targeted expression studies of insect-resistant gene with ricin fusion-gene under chloroplast transit peptide in cotton
Provedor de dados: 69
Autores: Kiani,Sarfraz; Ali,Arfan; Bajwa,Kamran Shehzad; Muzaffar,Adnan; Ashraf,Muhammad Aleem; Samiullah,Tahir Rehman; Shahid,Ahmad Ali; Husnain,Tayyab.
Background: Transgenic plants inhabiting single Bt gene are prone to develop insect resistance and this resistance has been reported in case of some important yield-devastating insect larvae of commercial crops, such as cotton and rice. Therefore, it has become essential to adapt new strategies to overcome the problem of insect resistance and these new strategies should be sophisticated enough to target such resistant larvae in broad spectrum. Among these, plants may be transformed with Bt gene tagged with some fusion-protein gene that possesses lectin-binding capability to boost the binding sites for crystal protein gene within insect mid-gut in order to overcome any chances of insect tolerance against Bt toxin. Enhanced chloroplast-targeted Bt gene...
Tipo: Journal article
Palavras-chave: Chloroplast expression; Chloroplast transit peptide; Cotton transformation; Confocal microscopy; Ricin b-chain.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600013

Cloning and comparison of ten gene sequences of a Chilean H. pylori strain with other H. pylori strains revealed higher variability for VacA and CagA virulence factors
Provedor de dados: 48
Autores: MÜLLER,ILSE; MEDINA-SELBY,ANGELICA; PALACIOS,JOSE LUIS; MARTINEZ,PATRICIO; OPAZO,PATRICIO; BRUCE,ELSA; MANCILLA,MARTA; VALENZUELA,PABLO; YUDELEVICH,ARTURO; VENEGAS,ALEJANDRO.
We have cloned and sequenced ten Helicobacter pylori genes from a Chilean strain (CH-CTX1) including: a cytotoxin VacA fragment, a CagA fragment (A17), a species-specific protein (TsaA), urease subunits (UreA, UreB), a flagellin subunit (FlaB), heat shock proteins (HspA and HspB), adhesin (HpaA) and a lipoprotein (Lpp20). We compared their deduced amino acid sequences with the corresponding sequences from three unrelated H. pylori strains, including fully sequenced strains 26695(UK) and J99(USA), and found that eight of them (UreA, UreB, FlaB, HspA, HspB, Lpp20, TsaA and HpaA) presented more than 97.3% identity. In contrast, VacA partial sequence showed lower identity values (93.2 - 94.9%). Moreover, we found major differences in the A17 region respect to...
Tipo: Journal article
Palavras-chave: Chilean H. pylori strain; PCR-cloned genes; HpaA; VacA; CagA sequences.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000100010

Cloning and expression analysis of peanut (Arachis hypogaea L.) CHI gene
Provedor de dados: 69
Autores: Zhang,Yue; Xia,Han; Yuan,Mei; Zhao,Chuanzhi; Li,Aiqin; Wang,Xingjun.
Chalcone isomerase (CHI) is the key enzyme that catalyzes chalcone into (2S)-flavanol or (2S)-5-desoxidation flavanol. The full length cDNA (1050 bp) of AhCHI (Arachis hypogaea CHI gene) was cloned by large scale EST sequencing using a peanut immature seed cDNA library. Sequence analysis results indicated that it was a type I CHI gene (with the accession number JN660794). The ORF of AhCHI was 768 bp, encoding a peptide of 255 amino acids with a pI of 5.189. Sequence alignment showed that the coding region of AhCHI gene is highly conserved to compare with CHI genes from other plant species. Peanut cDNA microarray and semi-quantitative RT-PCR analysis indicated that AhCHI was highly expressed in pegs. The expression level in flower and root was higher than...
Tipo: Journal article
Palavras-chave: Arachis hypogaea L.; CDNA library; Chalcone isomerase; Expression analysis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100005

Cloning and expression of S-Adenosyl Methionine Synthetase gene in recombinant E. coli strain for large scale production of SAMe
Provedor de dados: 69
Autores: Detchanamurthy,Swaminathan; Shanmugam,Kirubanandan; Parkunan,Salai Madhumathi Arasi; Puttananjaiah,Shilpa; Somasundaram,Balaji; Subramanian,Kannan.
S-Adenosyl Methionine (SAMe) Synthetase is an enzyme which catalyses the synthesis of S-Adenosyl Methionine using methionine and ATP. It is also known as AdoMet which is well known methyl donor, which modifies DNA, RNA, histones and other proteins, dictating replicational, transcriptional and translational fidelity, mismatch repair, chromatin modeling, epigenetic modifications and imprinting. The objective of the present work is to clone the SAMe Synthetase gene in recombinant E. coli strain in order to express, characterize and purify it for further synthesis of SAMe in a large scale fermentation. Expression was induced by 1 mM IPTG and expressed protein was characterized by SDS-PAGE. The recombinant E. coli cells were used for the production of SAMe...
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400001

Cloning and expression of the coding regions of the heat shock proteins HSP10 and HSP16 from Piscirickettsia salmonis
Provedor de dados: 48
Autores: WILHELM,VIVIAN; HUARACÁN,BERNARDO; MARTÍNEZ,RODRIGO; ROSEMBLATT,MARIO; BURZIO,LUIS O; VALENZUELA,PABLO D.T.
The genes encoding the heat shock proteins HSP10 and HSP16 of the salmon pathogen Piscirickettsia salmonis have been isolated and sequenced. The HSP10 coding sequence is located in an open reading frame of 291 base pairs encoding 96 aminoacids. The HSP16 coding region was isolated as a 471 base pair fragment encoding a protein of 156 aminoacids. The deduced aminoacid sequences of both proteins show a significant homology to the respective protein from other prokaryotic organisms. Both proteins were expressed in E. coli as fusion proteins with thioredoxin and purified by chromatography on Ni-column. A rabbit serum against P. salmonis total proteins reacts with the recombinant HSP10 and HSP16 proteins. Similar reactivity was determined by ELISA using serum...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000300013

Cloning and functional characterization of the gene encoding the transcription factor Acel in the basidiomycete Phanerochaete chrysosporium
Provedor de dados: 48
Autores: POLANCO,RUBÉN; CANESSA,PAULO; RIVAS,ALEXIS; LARRONDO,LUIS F; LOBOS,SERGIO; VICUÑA,RAFAEL.
In this report we describe the isolation and characterization of a gene encoding the transcription factor Acel (Activation protein of cup 1 Expression) in the white rot fungus Phanerochaete chrysosporium. Pc-acel encodes a predicted protein of 633 amino acids containing the copper-fist DNA binding domain typically found in fungal transcription factors such as Acel, Macl and Haal from Saccharomyces cerevisiae. The Pc-acel gene is localized in Scaffold 5, between coordinates 220841 and 222983. A S. cerevisiae acel null mutant strain unable to grow in high-copper medium was fully complemented by transformation with the cDNA of Pc-acel. Moreover, Northern blot hybridization studies indicated that Pc-acel cDNA restores copper inducibility of the yeast cup 1...
Tipo: Journal article
Palavras-chave: Acel; Basidiomycete; Copper; Phanerochaete chrysosporium.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000500007

Cloning and structural analysis of a cDNA clone encoding glycinin (Gly-1) seed storage protein of peanut
Provedor de dados: 69
Autores: Jain,Ashok K.
A cDNA clone (peanut Gly-1) encoding for glycinin protein was isolated from the immature seeds (from yellow-1 maturity pods) and characterized. The clone spanning a total of 1836 bp, predicted protein of 529 amino acid residues with a calculated mass of 60,447.61 Da. Peanut Gly-1 sequence comparison shows high level of sequence homology with other two peanut glycinin (arachin) genes [Ara h3 (95%) and Ara h4 (94%)] and glycinin (legumin) genes of other legumes such as soybean, broad bean, French bean and pea etc., both at nucleotide (67 to 69%) and amino acid (60 to 63%) levels. The N- and C-terminals of peanut Gly-1 are highly conserved with other glycinin genes; central region of the gene possess three variable regions, which also show conservation with...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300003

Cloning, characterization and expression of Peking duck fatty acid synthase during adipocyte differentiation
Provedor de dados: 69
Autores: Ding,Fang; Yuan,Xin; Li,Qingqing; Sun,Wenqiang; Gan,Chao; He,Hua; Song,Chenling; Wang,Jiwen.
Background Fatty acid synthase (FAS) is a key enzyme of de novo lipogenesis (DNL), which has been cloned from several species: Gallus gallus, Mus musculus, Homo sapiens, but not from Anas platyrhynchos. The current study was conducted to obtain the full-length coding sequence of Peking duck FAS and investigate its expression during adipocyte differentiation. Results We have isolated a 7654 bp fragment from Peking duck adipocytes that corresponds to the FAS gene. The cloned fragment contains an open reading frame of 7545 bp, encodes a 2515 amino acid protein, and displays high nucleotide and amino acid homology to avian FAS orthologs. Twelve hour treatment of oleic acid significantly up-regulated the expression of FAS in duck preadipocytes (P &lt; 0.05)....
Tipo: Journal article
Palavras-chave: Expression pattern; FAS; Oleic acid; Peking duck.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600001

Cloning, expression and characterization of the endoglucanase gene from Bacillus subtilis UMC7 isolated from the gut of the indigenous termite Macrotermes malaccensis in Escherichia coli
Provedor de dados: 69
Autores: Wei,Kelvin Swee Chuan; Teoh,Teow Chong; Koshy,Philip; Salmah,Ismail; Zainudin,Arifin.
Background Bacillus subtilis UMC7 isolated from the gut of termite Macrotermes malaccensis has the ability to secrete a significant amount of extracellular endoglucanase, with an enzyme activity of 0.12 ± 0.01 &amp;#956;mol/min/mL. However, for economically viable industrial applications, the enzyme needs to be expressed in a heterologous host to overcome the low enzyme production from the wild-type strain. Results The endoglucanase gene from B. subtilis UMC7 was successfully cloned and expressed. A higher enzyme activity was observed in the intracellular fraction of the recombinant clone (0.51 ± 0.02 &amp;#956;mol/min/mL) compared with the cell-bound fraction (0.37 ± 0.02 &amp;#956;mol/min/mL) and the extracellular fraction (0.33 ± 0.01...
Tipo: Journal article
Palavras-chave: &amp;#946; -1 4-Endoglucanase Carboxyl-methylcellulose Extracellular enzyme activity Metal ions effect.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200007

Cloning, molecular characterization and expression of a cDNA encoding a functional NADH-cytochrome b5 reductase from Mucor racemosus PTCC 5305 in E. coli
Provedor de dados: 48
Autores: SETAYESH,NED A; SEPEHRIZADEH,ZARGHAM; JABERI,ELHAM; YAZDI,MOJTABA TABATABAEI.
The present work aims to study a new NADH-cytochrome b5 reductase (cb5r) from Mucor racemosus PTCC 5305. A cDNA coding for cb s r was isolated from a Mucor racemosus PTCC 5305 cDNA library. The nucleotide sequence of the cDNA including coding and sequences flanking regions was determined. The open reading frame starting from ATG and ending with TAG stop codon encoded 228 amino acids and displayed the closest similarity (73%) with Mortierella alpina cb s r. Lack of hydrophobic residues in the N-terminal sequence was apparent, suggesting that the enzyme is a soluble isoform. The coding sequence was then cloned in the pET16b transcription vector carrying an N-terminal-linked His-Tag® sequence and expressed in Escherichia coli BL21 (DE3). The enzyme was then...
Tipo: Journal article
Palavras-chave: Mucor racemosus; NADH-cytochrome b s reductase; Soluble isoform.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200001

Cloning of the &amp;#969;-secalin gene family in a wheat 1BL/1RS translocation line using BAC clone sequencing
Provedor de dados: 69
Autores: Li,Meng Jun; Li,Ya Qing; Zhang,Nan; Shi,Zhan Liang.
Background: Wheat 1BL/1RS translocation lines are planted around the world for their disease resistance and high yield. Most of them are poor in bread making, which is partially caused by &amp;#969;-secalins that are encoded by the &amp;#969;-secalin gene family, which is located on the short arm of rye chromosome 1R (1RS). However, information on the structure and evolution of the &amp;#969;-secalin gene family is still limited. Results: We first generated a physical map of the &amp;#969;-secalin gene family covering 195 kb of the Sec-1 locus based on sequencing three bacterial artificial chromosome (BAC) clones of the 1BL/1RS translocation wheat cultivar Shimai 15. A BAC contig was constructed spanning 168 kb of the Sec-1 locus on 1RS. Twelve...
Tipo: Journal article
Palavras-chave: Bacterial artificial chromosome (BAC) Wheat &amp;#969; -Secalin 1BL/1RS translocation line.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300010

CO2 and N2O emissions from an Andisol in Chile under a no-till system using non-fixed closed chambers
Provedor de dados: 117
Autores: Muñoz,Cristina; Paulino,Leandro; Vera,Jenniffer; Zagal,Erick.
Chile has different types of soil and climate conditions that favor a wide range of agricultural activities that can generate potential atmospheric contamination like greenhouse gases (GHG). Nevertheless, the contribution of agricultural soils to atmospheric emissions has yet to be measured in Chile. The aim of this study was to assess seasonal variability of CO2 and N2O effluxes in situ from a volcanic ash-derived soil under different agronomic management practices. Gas samples were obtained from headspaces of non-fixed closed chambers in an annual crop rotation under a no-till system in an Andisol in southern Chile (36° S). Two N-sources (NH4+ and NO3-) and ammonium fertilization plus two lime doses (0.5 and 1 Mg ha-1) were considered for soil treatments...
Tipo: Journal article
Palavras-chave: Greenhouse gases; Agriculture; Nitrogen; Global change; Air pollution.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200013

Coadaptation: lessons from the brine shrimp Artemia, "the aquatic Drosophila" (Crustacea; Anostraca)
Provedor de dados: 97
Autores: GAJARDO,GONZALO; BEARDMORE,JOHN A.
During the fifties Brncic and the Dobzhansky's school, using the fruit fly Drosophila as a test organism, introduced the term integration of the genotype, or genetic coadaptation, which has had great impact on thinking in today's evolutionary biology. In this work we use the brine shrimp Artemia - in many respects a sort of aquatic Drosophila- as a model organism to evaluate the relationship between population structure, potential for divergence and the degree of morphological and/or genetic change. These aspects, tightly linked with the organization of the genotype, are important to understanding how recombination and adaptive release of genetic and phenotypic variation affect the speciation process in Artemia. Analysis of genetic (allozyme, diploid and...
Tipo: Journal article
Palavras-chave: Artemia; Coadaptation genetic variability interpopulation differentiation aquatic Drosophila.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000012

CoagVDb: a comprehensive database for coagulation factors and their associated SAPs
Provedor de dados: 48
Autores: Ali,Shabana Kouser; George Priya Doss,C; Thirumal Kumar,D; Zhu,Hailong.
The current state of the art in medical genetics is to identify and classify the functional (deleterious) or non-functional (neutral) single amino acid substitutions (SAPs), also known as non-synonymous SNPs (nsSNPs). The primary goal is to elucidate the mechanisms through which functional SAPs exert their effects, and ultimately interrogating this information for association with complex phenotypes. This work focuses on coagulation factors involved in the coagulation cascade pathway which plays a vital role in the maintenance of homeostasis in the human system. We developed an integrated coagulation variation database, CoagVDb, which makes use of the biological information from various public databases such as NCBI, OMIM, UniProt, PDB and SAPs...
Tipo: Journal article
Palavras-chave: Coagulation cascade pathway; Coagulation factor proteins; Single amino acid substitutions; SIFT; PolyPhen 2; I-Mutant 3; Fathmm; Align GVGD; PhD-SNP; SNPs&amp; GO; SNAP.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100035

Cobalt oxide nanoparticles aggravate DNA damage and cell death in eggplant via mitochondrial swelling and NO signaling pathway
Provedor de dados: 48
Autores: Faisal,Mohammad; Saquib,Quaiser; Alatar,Abdulrahman A.; Al-Khedhairy,Abdulaziz A.; Ahmed,Mukhtar; Ansari,Sabiha M.; Alwathnani,Hend A.; Dwivedi,Sourabh; Musarrat,Javed; Praveen,Shelly.
BACKGROUND: Despite manifold benefits of nanoparticles (NPs), less information on the risks of NPs to human health and environment has been studied. Cobalt oxide nanoparticles (Co3O4-NPs) have been reported to cause toxicity in several organisms. In this study, we have investigated the role of Co3O4-NPs in inducing phytotoxicity, cellular DNA damage and apoptosis in eggplant (Solanum melongena L. cv. Violetta lunga 2). To the best of our knowledge, this is the first report on Co3O4-NPs showing phytotoxicity in eggplant. RESULTS: The data revealed that eggplant seeds treated with Co3O4-NPs for 2 h at a concentration of 1.0 mg/ml retarded root length by 81.5 % upon 7 days incubation in a moist chamber. Ultrastructural analysis by transmission electron...
Tipo: Journal article
Palavras-chave: Cobalt oxide nanoparticles; Nanotoxicity; DNA damage; Apoptosis; Oxidative stress.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100020

Cocoa Bean (Theobroma cacao L.)Drying Kinetics
Provedor de dados: 117
Autores: MacManus Chinenye,Ndukwu; Ogunlowo,A.S; Olukunle,O.J.
Cocoa (Theobroma cacao L.) is widely produced in West Africa and South America and is a great economic tree crop, with so many industrial uses. In this work, the experimental drying kinetics of foreign species was investigated, and the experiments were carried out under isothermal conditions, using heated batch drier at 55, 70 and 81 ºC. The moisture ratio data obtained from change of moisture content with the drying time was fit to two thin layer drying model with good results. A faster drying process was observed at a higher drying temperature resulting in higher drying rates which is advantageous when evaluating costs. Fick’s second law of diffusion was used to predict effective diffusivity using experimental data assuming that the variation of...
Tipo: Journal article
Palavras-chave: Moisture content; Drying temperature; Diffusivity; Moisture ratio; Equilibrium moisture content.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000400014

Co-culture of Mouse Two-cell Embryos on Human Endometrial Stromal Cells in Proliferative and Secretory Phases
Provedor de dados: 77
Autores: Fakheri,Taravat; Nankali,Anisodowleh; Khazaei,Mozafar; Ghanbari,Ali; Abedini,Mehrandokht; Saeidiborojeni,Hamidreza.
There were no significant differences in the distribution of embryos reaching to 2- cells, 4- cells, morula or blastocysts culturing on human endometrial stromal cells (Secretory or proliferative phases). The percent of morula in stage A (without fragmentation), stage B (&lt;25% fragmentation), stage C (25-50% fragmentation) and stage D (&amp;gt;50% fragmentation) and did not showed significant differences between two coculture groups. Thus, the phase that the endometrial stromal cells were in thereby did not affect on the quality of embryos.
Tipo: Journal article
Palavras-chave: Co-culture; Embryo; Endometrium; Mice; Proliferative phase; Secretory phase.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400014

Código de Ética de la Sociedad de Biología de Chile
Provedor de dados: 48
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000100002

Código de Ética de la Sociedad de Biología de Chile
Provedor de dados: 48
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000300012

Codon optimization of 1,3-propanediol oxidoreductase expression in Escherichia coli and enzymatic properties
Provedor de dados: 69
Autores: Li,Wei; Ng,I-Son; Fang,Baishan; Yu,Jincong; Zhang,Guangya.
The gene dhaT from Klebsiella pneumoniae encoding 1,3-propanediol oxidoreductase (PDOR) was de novo synthesized by splicing overlap extension polymerase chain reaction (SOE-PCR) primarily according to Escherichia coli’s codon usage, as well as mRNA secondary structure. After optimization, Codon Adaptation Index (CAI) value was improved from 0.75 to 0.83, meanwhile energy of mRNA secondary structure was increased from -400.1 to -86.8 kcal/mol. This synthetic DNA was under control by phage T7 promoter in the expression vector pET-15b and transformed into the E. coli BL21 (DE3) strain. Inducers such as isopropyl &amp;#946;-D-thiogalactoside (IPTG) and lactose were compared by activity at different inducing time. The activity of PDOR after codon optimized was...
Tipo: Journal article
Palavras-chave: 1; 3-propanediol oxidoreductase codon optimization enzymatic properties Escherichia coli overlap extension PCR.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400007

Coenzyme Q10 defects may be associated with a deficiency of Q10-independent mitochondrial respiratory chain complexes
Provedor de dados: 48
Autores: Fragaki,Konstantina; Chaussenot,Annabelle; Benoist,Jean-François; Ait-El-Mkadem,Samira; Bannwarth,Sylvie; Rouzier,Cécile; Cochaud,Charlotte; Paquis-Flucklinger,Véronique.
BACKGROUND: Coenzyme Q10 (CoQ10 or ubiquinone) deficiency can be due either to mutations in genes involved in CoQ10 biosynthesis pathway, or to mutations in genes unrelated to CoQ10 biosynthesis. CoQ10 defect is the only oxidative phosphorylation disorder that can be clinically improved after oral CoQ10 supplementation. Thus, early diagnosis, first evoked by mitochondrial respiratory chain (MRC) spectrophotometric analysis, then confirmed by direct measurement of CoQ10 levels, is of critical importance to prevent irreversible damage in organs such as the kidney and the central nervous system. It is widely reported that CoQ10 deficient patients present decreased quinone-dependent activities (segments I + III or G3P + III and II + III) while MRC activities...
Tipo: Journal article
Palavras-chave: Mitochondrial disease; CoQ10 deficiency; Respiratory chain; Spectrophotometry; LC-MSMS.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100004

Coexistence of an Axillary Arch Muscle (Latissimocondyloideus Muscle) with an Unusual Axillary Artery Branching: Case Report and Review
Provedor de dados: 77
Autores: Soubhagya,R. Nayak; Latha,V. Prabhu; Ashwin,K; Madhan,Kumar S. J.; C. Ganesh,Kumar.
The axilla is a relatively small pyramidal compartment between the thoracic wall and the arm, which contains muscles and vital neurovascular bundles. They are important for their clinical and morphological reasons. We report an anomalous latissimocondyloideus muscle and a rare variant of the axillary artery, which lies beneath the anomalous muscle. The anomaly is one of its kind. The morphology and the clinical significance of the muscle have been reviewed
Tipo: Journal article
Palavras-chave: Axillary arch; Latissimocondyloideus muscle; Axillary artery; Variation; Morphology.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300003

Coexistence of cytotypes and chromosomal mosaicism in Hoplias malabaricus (Characiformes, Erythrinidae)
Provedor de dados: 48
Autores: DA ROSA,RENATA; RUBERT,MARCELÉIA; BERTOLLO,LUIZ A C; MARTINS-SANTOS,ISABEL C; GIULIANO-CAETANO,LUCIA.
Karyotypes of seventeen Hoplias malabaricus specimens, collected in the fish culture station of UNOPAR (University of Northern Paraná), were analyzed. The station is in the Claro River system in the Tibagi River basin. Two distinct and coexistent karyotype forms (cytotypes) were identified, comprising either 42 chromosomes (cytotype A) or 40 chromosomes (cytotype C), both presenting metacentric and submetacentric chromosomes. In two specimens, one male and one female, it was not possible to characterize a modal diploid number because different cell lines were observed, with a predominance of 2n=41 and 2n=42 chromosomes at a frequency of 38.24% and 41.12%, respectively. The karyotype with 2n=41 showed some putative monosomic and trisomic chromosomes, while...
Tipo: Journal article
Palavras-chave: Hoplias malabaricus; Chromosomal mosaicism; Coexistence of cytotypes; RAPD; Reproductive isolation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300003

COLABORACION EN INVESTIGACION ENTRE CHILE Y LA UNION EUROPEA
Provedor de dados: 48
Autores: Jerez,Carlos A.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000300001

Cold resistance in plants: A mystery unresolved
Provedor de dados: 69
Autores: Jan,Nishawar; ul-Hussain,Mahboob; Andrabi,Khurshid I.
Herbaceous temperate plants are capable of developing freezing tolerance when they are exposed to low nonfreezing temperatures. Acquired freezing tolerance involves extensive reprogramming of gene expression and metabolism. Recent full-genome transcript profiling studies, in combination with mutational and transgenic plant analyses, have provided a snapshot of the complex transcriptional network that operates under cold stress. The changes in expression of hundreds of genes in response to cold temperatures are followed by increases in the levels of hundreds of metabolites, some of which are known to have protective effects against the damaging effects of cold stress. Genetic analysis has revealed important roles for cellular metabolic signals, and for RNA...
Tipo: Journal article
Palavras-chave: Cold acclimation; Cold resistance; CORs (cold regulated).
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300014

Cold storage effects on oxidative stress of Red Globe table grape rachises
Provedor de dados: 118
Autores: Campos-Vargas,Reinaldo; Zamora,Pablo; Contreras,Rodrigo; Köhler,Hans; Zúñiga,Gustavo E; Pérez-Donoso,Alonso; Defilippi,Bruno G.
Table grape (Vitis vinifera L.) quality includes the condition of both the berries and the rachis. In the present report, physiological parameters of Red Globe rachises from fully elongated inflorescences (RFEI) and from mature clusters were studied after storage at 0 or 20 °C for different durations. To understand changes in rachis physiology as a result of changes in temperature conditions and storage time, the activities of superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) were measured. In addition, hydrogen peroxide content, membrane lipoperoxidation (TBARS), total phenolic compounds and antioxidant capacity (FRAP) were assayed. TBARS was higher in mature rachises than in RFEI. This parameter remained constant throughout...
Tipo: Journal article
Palavras-chave: Fruit quality; Rachis; Storage; Table grape; Vitis vinifera L.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100007

Cold tolerance evaluation in Chilean rice genotypes at the germination stage
Provedor de dados: 117
Autores: Donoso Ñanculao,Gabriel; Paredes Cárcamo,Mario; Arbiza de los Santos,Oscar; Becerra Velásquez,Viviana.
Low temperature is the most important abiotic stress affecting rice (Oryza sativa L.) yield in Chile. Rice in Chile is usually planted when the minimum air temperatures are below 12 °C. This temperature is lower than the optimum needed for normal rice germination. Therefore, the aim of this study was to evaluate cold tolerance in 20 experimental lines from the Rice Breeding Program of the Instituto de Investigaciones Agropecuarias (INIA), Chile, at the germination stage. Coleoptile length reduction (CRED), coleoptile length after cold treatment (CLEN), coleoptile length recovery (CREC), and coleoptile regrowth (CREG) were evaluated at 13 °C for 4 d using 'Diamante-INIA' as the cold-tolerant control. To find genotypes with cold tolerance (low CRED value and...
Tipo: Journal article
Palavras-chave: Low temperatures; Coleoptile length; Experimental lines.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000100001

Cold tolerance evaluation of temperate rice (Oryza sativa L. ssp. japonica) genotypes at seedling stage
Provedor de dados: 73
Autores: DONOSO,GABRIEL; CABAS,PATRICIA; PAREDES,MARIO; BECERRA,VIVIANA; BALZARINI,MÓNICA.
Cold is the most important abiotic factor that affect rice yield in Chile, which can alter the phenology and physiology of the rice at seedling stage. With the aim to increase the accuracy for cold tolerance evaluation in Chilean Rice Breeding Program of the Instituto de Investigaciones Agropecuarias (INIA), 109 experimental lines were evaluated to cold tolerance using morphological and physiological traits, at seedling stage. Cold treatment was achieved by placing seedlings at 5 °C on dark for 72 h and evaluations were made after seven days recovery. Leaf chlorosis based on the standard evaluation system scale (SES), Chlorophyll content (Chl), Malondialdehyde concentration (MDA) and maximum quantum yield of Photosystem II (Fv/Fm) were evaluated. Best...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100001

COLEOPTEROS ASOCIADOS AL FOLLAJE Y FENOLOGIA DE LITHREA CAUSTICA (MOL.) (ANACARDIACEAE) EN UN FRAGMENTO DE BOSQUE COSTERO,VIII REGION, CHILE
Provedor de dados: 72
Autores: Briones,Raúl; Jerez,Viviane.
Se analizó la composición taxonómica y riqueza específica de coleópteros asociados al follaje de L. caustica en un sector del fundo Escuadrón, comuna de Coronel, Provincia de Concepción (72° 59' 09'' W y 36° 58' 47''S), durante el invierno y primavera de 2002. Se plantea que debe existir cambios interestacionales y una relación entre los niveles de abundancia y riqueza especifica de coleópteros en el follaje del litre y los cambios fenológicos que ocurren en éste. Para corroborar esta hipótesis, se determinó mediante muestreos efectuados entre junio y diciembre de 2002 y en ramas seleccionadas, las fenofases vegetativas de 30 litres expresadas en crecimiento de ramas, yemación foliar y floral, número de hojas y floración. Los insectos se recolectaron por...
Tipo: Journal article
Palavras-chave: Chile; Coleópteros; Lithrea caustica; Fenología; Riqueza específica; Abundancia.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100004

Collection, Characterization and Use of Genetic Bariation in Chilean Bean Germplasm (Phaseolus vulgaris L.)
Provedor de dados: 113
Autores: Bascur B.,Gabriel; Tay U.,Juan.
Recently performed studies on the type of seed protein present from several origins and their morphological traits have shown that the common bean (Phaseolus vulgaris L.) is native to America, being a species without a specific center of origin and with two areas of domestication: Central America and South America. In this last center, three strains were determined, one of them is called "the Chilean strain", which as noted is a sub-center of genetic diversity for this species. With the purpose of collecting and preserving the genetic diversity present in the Chilean ecotypes, a germplasm collection was made, from Arica to Chiloe, visiting 207 locations in 28 expeditions and collecting 1239 accessions. This material was seeded in two Regional Center of...
Tipo: Journal article
Palavras-chave: Germplasm; Chilean strain; Genetic variation; Morphologic characterization; Phaseolus vulgaris L.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200003

Colonization of blueberry (Vaccinium corymbosum) plantlets by ericoid mycorrhizae under nursery conditions
Provedor de dados: 118
Autores: Carrillo,Rubén; Guerrero,Jaime; Rodríguez,Mario; Meriño-Gergichevich,Cristian.
R. Carrillo, J. Guerrero, M. Rodríguez, and C. Meriño-Gergichevich. 2015. Colonization of blueberry (Vaccinium corymbosum L.) plantlets by ericoid mycorrhizae under nursery conditions. Cien. Inv. Agr. 42(3): 365-374. The ericoid mycorrhiza is a symbiotic interaction that contributes to the improvement of the establishment and production of blueberries (Vaccinium corymbosum L.). The objectives of this paper were to assess the frequency (%) and intensity (%) of the colonization and growth of blueberry plantlets inoculated with ericoid mycorrhizae collected from three different edaphoclimatic conditions in the La Araucanía region of southern Chile under nursery conditions. Plantlets of three blueberry cultivars ("Brigitta", "Duke" and "Legacy") were grown...
Tipo: Journal article
Palavras-chave: Blueberry; Ericoid mycorrhizae; Micorrhizal colonization.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000300005

Colony cycle, foundation strategy and nesting biology of a Neotropical paper wasp
Provedor de dados: 97
Autores: SINZATO,DANIELLE M. S; ANDRADE,FLÁVIO R; DE SOUZA,ANDRÉ R; DEL-CLARO,KLEBER; PREZOTO,FÁBIO.
Polistes ferreri Saussure, 1853 is a Neotropical paper wasp often found in anthropic environments. However, there is little information available on biological, ecological and behavioral interactions of this species under these environmental conditions. This study investigated the colony cycle, foundation strategy and nesting biology of this species. From March of 2000 to February of 2004, several colonies were studied in the municipal district of Juiz de Fora, in southeastern Brazil. The colony cycle events of P. ferreri are concentrated in specific periods of the year. The colonies are established principally by association of females, the latter is the foundation strategy that confers the greatest success. Nidification on manmade substrates seems common...
Tipo: Journal article
Palavras-chave: Colony productivity; Colony success; Foundation pattern; Polistes ferreri.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000300004

Color polymorphism in Pachycoris torridus (Hemiptera: Scutelleridae) and its taxonomic implications
Provedor de dados: 97
Autores: SOUZA,GABRIELY K.; PIKART,TIAGO G.; OLIVEIRA,HARLEY N.; SERRÁO,JOSÉ E.; ZANUNCIO,JOSÉ C.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000300011

Color vision in the comb frequency domain
Provedor de dados: 48
Autores: BONNARDEL,VALÈRIE; VARELA,FRANCISCO J.
In 1982, Horace Barlow considered the question of human trichromacy in the context of information theory: according to the Sampling Theorem, three types of receptors covering the visible spectrum (400- -700 nm) might be sufficient to reconstruct the color signal. Although Barlow was led to reject the direct application of the Sampling Theorem to explain color dimensionality, the theoretical framework offers a fresh point of view for analyzing the color system in conjunction with the physical characteristics of natural color signals. This review aims to illustrate that if the strict mathematical reconstruction (as implied by the Sampling Theorem) is replaced by a pragmatic approximation of color signals, then trichromacy, with its subsequent opponent-color...
Tipo: Journal article
Palavras-chave: Color vision color dimensionality; Comb-filtered spectra color constancy Fourier analysis.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000100011

Colorectal cancer DNA methylation patterns from patients in Manaus, Brazil
Provedor de dados: 48
Autores: Almeida,Fabiana Greyce Oliveira; Aquino,Priscila Ferreira de; Souza,Afonso Duarte Leäo de; Souza,Antonia Queiroz Lima de; Vinhote,Sonia do Carmo; Mac-Cormick,Thais Messias; Silva,Marcelo Soares da Mota; Chalub,Sidney Raimundo Silva; Fischer,Juliana de Saldanha da Gama; Carvalho,Paulo Costa; Carvalho,Maria da Gloria da Costa.
BACKGROUND: DNA methylation is commonly linked with the silencing of the gene expression for many tumor suppressor genes. As such, determining DNA methylation patterns should aid, in times to come, in the diagnosis and personal treatment for various types of cancers. Here, we analyzed the methylation pattern from five colorectal cancer patients from the Amazon state in Brazil for four tumor suppressor genes, viz.: DAPK, CDH1, CDKN2A, and TIMP2 by employing a polymerase chain reaction (PCR) specific to methylation. Efforts in the study of colorectal cancer are fundamental as it is the third most of highest incidence in the world. RESULTS: Tumor biopsies were methylated in 1/5 (20 %), 2/5 (40 %), 4/5 (80 %), and 4/5 (80 %) for CDH1, CDKN2A, DAPK, and TIMP2...
Tipo: Journal article
Palavras-chave: Methylation; Colorectal cancer; Amazon; Epigenetic.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100050

COMBARBALA-INIA, UN CULTIVAR PRECOZ DE HUALPUTRA (Medicago polymorpha L.) PARA AREAS DE SECANO MEDITERRANEO.
Provedor de dados: 113
Autores: del Pozo L.,Alejandro; Ovalle M.,Carlos; Avendaño R.,Julia; Aravena,Teresa; Díaz,M. Elena.
Combarbalá-INIA es un nuevo cultivar de hualputra (Medicago polymorpha L.), seleccionado entre un gran número de accesiones colectadas en Chile, entre La Serena (29º 55’ lat. Sur) y Temuco (38º 47’ lat. Sur). Es una leguminosa forrajera anual, precoz (71 - 83 días desde emergencia a primera flor), apta para áreas de secano de la zona mediterránea árida, semiárida y subhúmeda, es decir, entre la IV y VI Regiones de Chile. Presenta un hábito de crecimiento postrado, flores de color amarillo, y los gloquídeos no tienen espinas. Se adapta muy bien a sistemas de rotación con cereales ("ley farming system"), ya que produce una gran cantidad de semillas duras impermeables al agua. La producción de fitomasa y de semillas es superior a la de cultivares australianos...
Tipo: Journal article
Palavras-chave: Clima mediterráneo; Chile; Leguminosa forrajera; Medicago anual; Materia seca; Rotación; Producción de semillas.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100011

Combinación de Osteotecnia más Conservación de Músculos en Montaje Único de Canis lupus familiaris
Provedor de dados: 77
Autores: Villarroel Guerra,Mauricio Armando; Troncoso Felipe,Nazareth Andrea.
Para la enseñanza de la Anatomía siempre se está en búsqueda de alternativas para la conservación y presentación de preparados anatómicos, realizando variaciones de diferentes técnicas, que permitan presentar especímenes con fines didácticos, para lograr un mejor aprendizaje, comprensión y motivación por la Morfología. El objetivo de este trabajo fue utilizar una combinación de osteotecnia más la conservación de músculos, en un montaje único que permite estudiar en una mitad el esqueleto, y en la otra, la musculatura superficial de un Canis lupus familiaris. Se utilizó un cadáver del especimen fijado por congelación, luego se realizó una limpieza general, extracción de vísceras y retiro de tegumentos previo al corte sagital. En la mitad derecha se realizó...
Tipo: Journal article
Palavras-chave: Técnica anatómica; Osteotecnia; Conservación de músculos; Especímenes anatómicos.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100055

Combined effect of irrigation and compost application on Montepulciano berry composition in a volcanic environment of Latium region (central Italy)
Provedor de dados: 118
Autores: Cirigliano,Pasquale; Vincenza Chiriacò,Maria; Nunez,Abelardo; Dal Monte,Giovanni; Labagnara,Tilde.
Abstract Montepulciano red grape is cultivated in the northern part of the Latium region, primarily for the production of DOC &amp;#8220;Colli Etruschi Viterbesi&amp;#8221; structured wines for aging. In Mediterranean areas, viticulture is closely influenced by vine water status. In this context, the practice of irrigation may alleviate water-stress-related reductions in plant development to guarantee grape quality, especially in semi-arid areas. The application of on-farm compost in a vineyard may affect grape quality without negative effects, thereby enhancing environmental sustainability. The aim of this work was to investigate the combined effect of irrigation and compost application on the Montepulciano variety in the volcanic environment of Latium...
Tipo: Journal article
Palavras-chave: Climate change adaptation; Compost on farm; Polyphenols concentration; Vitis vinifera L.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000200195

Combining Ability Analysis for Achene Yield and Related Traits in Sunflower (Helianthus annuus L.)
Provedor de dados: 117
Autores: Waqas Ahmad,Muhammad; Shahzad Ahmed,Muhammad; Nadeem Tahir,Hammad.
Ten sunflower (Helianthus annuus L.) lines, five testers, and 50 crosses developed in line x tester fashion were evaluated for general combining ability (GCA) and specific combining ability (SCA) effects in a triplicate randomized complete block design, in Faisalabad, during 2009-2010. Genetic variability among genotypes was assessed for days to flowering, days to maturity, plant height, internodal length, leaf area, number of leaves per plant, head diameter, stem girth, percentage of filled achenes, 100 achene weight, achene yield per plant. A-1, A-7, A-27 and A-39 had significant general combining ability effects for days to flowering, days to maturity, internodal length, leaf area, and achene yield per plant. Among testers, A-26 and HBRS-1 were good...
Tipo: Journal article
Palavras-chave: GCA; SCA; Line x tester and yield.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100004

Combining genetic gain and diversity under an individual selection method in a selected provenance of Eucalyptus cladocalyx
Provedor de dados: 118
Autores: Mora,Freddy; Saavedra,Javier.
Flowering traits are becoming important breeding objectives in Eucalyptus cladocalyx. Previous studies have confirmed that the trees from Cowell, Australia, respond well for early flowering under the arid conditions in the Southern Atacama Desert, Chile. This selected population was evaluated for flowering intensity at the end of the flowering season of 2009/2010 (February 2010). A Bayesian threshold tree model via Gibbs sampling was used in the data analyses. The model included the genotype-environment interaction (two sites) using a bi-character threshold model. The posterior mean of the genetic correlation between the sites was positive and high (r=0.8) and, according to the 95% credible interval (0.44-0.96), it was significantly different from zero,...
Tipo: Journal article
Palavras-chave: Arid environmental conditions; Bayesian framework; Breeding values; Flowering components.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100014

Combining Multivariate Analysis and Pollen Count to Classify Honey Samples Accordingly to Different Botanical Origins
Provedor de dados: 117
Autores: Corbella,Eduardo; Cozzolino,Daniel.
This study reports the combination of multivariate techniques and pollen count analysis to classify honey samples accordingly to botanical sources, in samples from Uruguay. Honey samples from different botanical origins, namely Eucalyptus spp. (n = 10), Lotus spp. (n = 12), Salix spp. (n = 5), “mil flores” (Myrtaceae spp.) (n = 12) and coronilla (Scutia buxifolia Reissek) (n = 10) were analysed using Melissopalynology (pollen identification). Principal component analysis (PCA) and linear discriminant analysis (LDA) were used to classify the honey samples accordingly to their botanical origin based on a pollen count. Honey samples of higher percentage (&gt; 70%) of Eucalyptus, Lotus and Scutia pollen were 100% correctly classified, whilst samples from...
Tipo: Journal article
Palavras-chave: Honey; Uruguay; Principal component analysis; Linear discriminant analysis; Pollen analysis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100010

COMENTARIO DE LIBRO
Provedor de dados: 73
Autores: Marticorena,Alicia.
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100011

COMENTARIO DE LIBROS
Provedor de dados: 73
Autores: Marticorena,Alicia.
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100010

COMENTARIO LIBROS
Provedor de dados: 73
Autores: Marticorena,Clodomiro.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100008

Comentarios acerca de "Observaciones sobre la presencia de Paraptenodytes y Palaeospheniscus (Aves: Sphenisciformes) en la Formación Bahía Inglesa, Chile"
Provedor de dados: 97
Autores: ACOSLA HOSPILALECHE,CAROLINA; CANLO,JHOANN.
La presente tiene por objeto realizar una réplica a los comentarios que Chávez (2007) efectuara en este mismo volumen sobre nuestro trabajo Acosta Hospitaleche &amp;amp; Canto (2005). Como ampliaremos, creemos que sus críticas son demasiado arriesgadas, dado que Chávez (2007) no ha revisado los materiales estudiados en nuestro trabajo, pero se explaya ampliamente sobre ellos, fundamentando su discusión en el examen de una única fotografía, tal como lo indica. Los datos que emplea y cita no son del todo correctos y no están actualizados, lo que impacta erróneamente en sus conclusiones
Tipo: Journal article
Palavras-chave: Pingüinos fósiles; Formación Bahía Inglesa.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200011

Comentarios y observaciones acerca de la diatomea Craspedostauros indubitabilis (Lange-Bertalot &amp;amp; Genkal) E.J. Cox encontrada por primera vez en aguas marinas costeras de Chile
Provedor de dados: 73
Autores: RIVERA,PATRICIO; CRUCES,FABIOLA; ECTOR,LUC.
Especímenes de Craspedostauros indubitabilis (Lange-Bertalot &amp;amp; Genkal) E.J. Cox provenientes de una muestra recolectada en Bahía Salada, Caldera, Chile (27°38'S-71°00'W) fueron oxidados y examinados mediante técnicas de microscopía fotónica y electrónica. El género y la especie son señalados por primera vez para las aguas marinas costeras de Chile. Craspedostauros fue descrito por Cox en 1999 para reunir algunas diatomeas marinas birrafidales, ubicadas hasta esa fecha en los géneros Stauroneis Ehrenberg y Stauronella Mereschkowsky. El género puede ser reconocido por sus aréolas provistas de cribra, un estauro angosto, numerosas bandas en el cingulum y dos cloroplastos en forma de H con una peculiar disposición en la zona central. De acuerdo con el...
Tipo: Journal article
Palavras-chave: Craspedostauros indubitabilis; Bacillariophyceae; Morfología; Taxonomía; Distribución; Chile.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200001

"Comics" as a tool for teaching biotechnology in primary schools
Provedor de dados: 69
Autores: Rota,Gladis; Izquierdo,Juan.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200003

Comics for Laypeople Interested in Plastination
Provedor de dados: 77
Autores: Chung,Beom Sun; Sui,Hong-Jin; Chung,Min Suk.
Exhibitions of plastinated specimens are popular around the world, but most people are not aware of the basics of plastination process because they are not interested in reading the related writings. Comics are an attractive medium and could solve this problem. The objective of this study was to enhance public comprehension of plastination using comics. Three topics were selected for the comics: the traditional ways to preserve dissected cadaver specimens, the plastination technique used to resolve the problems of the traditional ways, and the public display of the plastinated specimens. The 67 comic frames were drawn in simple style. The comics were available online (anatomy.co.kr) free of charge. The original files of the comics will be provided to those...
Tipo: Journal article
Palavras-chave: Cartoons; Anatomicmodels; Museums; Nonprofessional education.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300047

Comment on &amp;#8220;Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn (II) ions detoxification from waste water using unmodified and EDTA-modified maize husk&amp;#8221;
Provedor de dados: 69
Autores: Cavas,Levent.
The citing and using of correct version of mathematical equations are of great importance in the writing of a scientific paper. This paper presents the possible errors related to Dubinin-Radushkevich Equation in an article by Igwe and Abia (2007) which was published in Electronic Journal of Biotechnology, 10(4); 536-548.
Tipo: Journal article
Palavras-chave: Adsorption; Calculation errors; DR equation.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200001

Comment on 'An evaluation of copper biosorption by a brown seaweed under optimized conditions' by Antunes, W.M., Luna, A.S., Henriques, C.A. and da Costa, A.C.A.
Provedor de dados: 69
Autores: Ho,Yuh-Shan.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200011

Commentary: Is the Evidence for Localization of Nephrin on the Slit Diaphragm Rigid?
Provedor de dados: 77
Autores: Hipkaeo,Wiphawi; Suzuki,Ryoji; Abe,Hiroshi; Chaisiwamongkol,Kowit; Kondo,Hisatake.
After careful observation of immuno-electron microscopic findings of the renal glomerular podocyte slit so far published by various authors, it should be noted that no convincing evidence is present for localization of nephrin-immunoreactivity in the slit itself, but that nephrin-immunoreactivity is dominantly localized along the membranes of podocyte pedicles from their tip over a substantial extension. In addition, the notion that the slit diaphragm is composed of strands is compatible with the widely distributed view that the slit strands represent rod-shaped nephrin molecules. However, 3-D findings that the diaphragm is composed of not only strands but also membranous elements have recently demonstrated separately by embedment-free section electron...
Tipo: Journal article
Palavras-chave: Glomerulus; Slit; Nephrin; Localization; Immunohistochemistry.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400016

Comments on Professor Serani's article
Provedor de dados: 48
Autores: MATURANA-ROMESIN,HUMBERTO.
I prefer not to comment on Professor Serani's epistemological and methodological objections, as I find they do not apply to my work from the perspective of a reading that recognizes the differences between his metaphysical position and my own. Neither the introduction nor the book itself constitute a philosophical thesis, as they emerge in a metaphysical position that neither seeks nor requires transcendental arguments to justify it. It is either validated or not by the operational coherencies of the observer's life experiences. There is no doubt that I believe that the book does what it sets out to do: it shows the conditions of the constitution of living beings and the conditions of their survival.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000300006

Commercial Digital Camera to Estimate Postharvest Leaf Area Index in Vitis vinifera L. cv. Cabernet Sauvignon on a Vertical Trellis
Provedor de dados: 117
Autores: Espinosa L.,Miguel; Acuña C.,Eduardo; Espinosa B.,Miguel; Barrera B.,Juan.
The leaf area index (LAI) of a vineyard (Vitis vinifera L.) cv. Cabernet Sauvignon located in the commune of Cauquenes, Maule Region in Chile, was estimated from digital images obtained with a commercial camera using two indirect methods: Leaf Area Gap and Brightness (LAGB) and -Photogrammetric Leaf Area Quantification System (PLAQS). The latter requires deleafing of the grapevine. In a normalized difference vegetation index (NDVI) map, three points of vine vigor were selected: high, medium, and low for which horizontal and vertical images were obtained. Images were filtered with the Arc View GIS 3.1 program to provide only leaf images and corresponding pixel numbers. Image area and square meters per linear meter were calculated. The best models were...
Tipo: Journal article
Palavras-chave: Vitis vinifera; Leaf area index; Digital image; Photographic camera.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200015

Common Carotid Artery Bifurcation Levels Related to Clinical Relevant Anatomical Landmarks
Provedor de dados: 77
Autores: Ribeiro,Rogério Alves; Ribeiro,João Alberto de Souza; Rodrigues Filho,Omar Andrade; Caetano,Abadio Gonçalves; Fazan,Valéria Paula Sassoli.
In head and neck surgery, the common carotid arteries are important landmarks, defining dissection plane during radical neck surgeries. The objectives of the present study were to add information on the diameter of the carotid arteries and to correlate the common carotid artery (CCA) bifurcation level with important anatomical landmarks used regularly in clinical practice. Forty-six necks from male embalmed human cadavers were evaluated. The CCA as the external (ECA) and internal (ICA) carotid arteries diameters were studied with the aid of an electronic digital caliper. No differences were found between sides in any level studied. The CCA bifurcation level was measured in relation to clinically relevant anatomical landmarks (superior level of the thyroid...
Tipo: Journal article
Palavras-chave: Vascular anatomy; Surgical anatomy; Neck surgery; Carotid artery; Arterial diameter.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400019

Communication Between the Mylohyoid and Lingual Nerves: Clinical Implications
Provedor de dados: 77
Autores: Fazan,Valeria Paula Sassoli; Rodrigues Filho,Ornar Andrade; Matamata,Fernando.
The mylohyoid muscle plays an important role in chewing, swallowing, respiration and phonation, being the mylohyoid nerve also closely related to these important functions. It has been postulated that the mylohyoid nerve might have a role in the sensory innervation of the chin and the lower incisor teeth while the role of the mylohyoid nerve in the mandibular posterior tooth sensation is still a controversial issue. Although variations in the course of the mylohyoid nerve in relation to the mandible are frequently found on the dissecting room, they have not been satisfactorily described in the anatomical or surgical literature. It is well known that variations on the branching pattern of the mandibular nerve frequently account for the failure to obtain...
Tipo: Journal article
Palavras-chave: Mylohyoid nerve; Lingual nerve; Inferior alveolar nerve; Tongue sensation; Teeth sensation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300015

Communication of the Anterior Branch of the Great Auricular Nerve with the Cervical Branch of Facial Nerve and its Variant Nerve Endings Deep in the Parotid Gland
Provedor de dados: 77
Autores: Rao Sirasanagandla,Srinivasa; Nayak B,Satheesha; Bhat,Kumar M. R; Ravindra S,Swamy.
The communications between the branches of cervical plexus and cervical branch of facial nerve are common and are well known. However, this communication usually occurs between the transverse cervical nerve and cervical branch of facial nerve. During routine dissection classes for the Medical undergraduate students, we came across an anatomical variant of anterior division of great auricular nerve. This variation was found in a 60-year-old male cadaver of South Indian origin and it was unilateral. The great auricular nerve arose from the loop of ventral rami of C2 and C3 spinal nerves and divided into anterior and posterior branches. The anterior branch ran obliquely upwards and forwards on the surface of the sternocleidomastoid muscle along with the...
Tipo: Journal article
Palavras-chave: Great auricular nerve; Cervical plexus; Communication; Facial nerve; Parotid gland.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300012

Communication of the External and Internal Jugular Veins: A Case Report
Provedor de dados: 77
Autores: Lalwani,Rekha; Rana,Kum Kum; Das,Srijit; Khan,Riyazul Qamar.
The external jugular vein, which traverses the sternocleidomastoid muscle superficially, is known to exhibit variations in its formation and course. There are less reports on the communication of the external and internal jugular vein. During routine cadaveric dissection, we detected an abnormal communication of the external jugular vein and the internal jugular vein, in a 45 year male cadaver. The knowledge of both normal and abnormal anatomy of the superficial veins of the neck may be important for clinicians performing catheterization and surgeons operating in the region of the neck. The presence of such anomalous communications may also be important for radiologists performing angiographic and sonographic studies
Tipo: Journal article
Palavras-chave: External jugular vein; Internal jugular vein; Anatomical variations.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500033

Communities of soil macrofauna in green spaces of an urbanizing city at east China
Provedor de dados: 97
Autores: BAO-MING,GE; ZHEN-XING,LI; DAI-ZHEN,ZHANG; HUA-BIN,ZHANG; ZONG-TANG,LIU; CHUN-LIN,ZHOU; BO-PING,TANG.
We evaluated the diversity of soil macrofauna communities inhabiting urban green spaces in Yancheng City, an urbanizing city located east of China. In the end of April 2011, the taxonomic richness, abundance and composition of soil macrofauna communities were assessed and compared among five types of green space (poplar forest, rapeseed farm, grassland in park, lawn and nursery garden) and three depth layers in the soil, with taxonomic resolution attained at the order level. Taxonomic richness (orders) and abundance were significantly different among green spaces. Diversity indices (Margalef's taxonomic richness R and Shannon-Weaver diversity index H') were higher in poplar forest, grassland in park and nursery garden than in rapeseed farm and lawn....
Tipo: Journal article
Palavras-chave: China; Diversity; Soil layer; Urbanization; Yancheng City.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000200008

Community structure of the intertidal meiofauna along a gradient of morphodynamic sandy beach types in southern Chile
Provedor de dados: 97
Autores: RODRÍGUEZ,J. GERMÁN; LÓPEZ,JESÚS; JARAMILLO,EDUARDO.
Three sandy beaches located in southern Chile (Gaviotas, Guabún and Mar Brava; ca. 42º S) were studied during the summer of 2000 to analyse the patterns in abundance and biomass of the meiofauna along a gradient of morphodynamic beach types. Sediment samples were collected with metallic cylinders (23 cm² cross sectional area, 120 cm long) at ten equally spaced tidal levels along six transects separated between 5 and 10 m and extending from above the drift line down to the low tide level. Porosity, shear strength, water content, penetrability and grain size of the substrate were measured in each sampling level. The meiofauna was primarily represented by Nematoda and Copepoda Harpacticoidea. The highest average density and biomass per unit of area were found...
Tipo: Journal article
Palavras-chave: Sandy beach meiofauna; Southern Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400015

Community structure of the macroinfauna in the sediments below an intertidal mussel bed (Mytilus chilensis (Hupe)) of southern Chile
Provedor de dados: 97
Autores: DUARTE,CRISTIAN; JARAMILLO,EDUARDO; CONTRERAS,HERALDO; FIGUEROA,LUIS.
The mytilid mussel Mytilus chilensis (Hupe) can form dense beds in sedimentary areas of the inland coast of the Nord-Patagonic archipelagos of the Chilean coast (ca. 40-43° S). During the autumn of 2002, we collected replicated samples at five intertidal stations in Panitao (Golfo de Reloncaví) ordered along a transect parallel to the low tide level and extended from the center of the bank (stations one and two with 100 and ca. 25 % of mussel cover, respectively) to the bare sediments of the intertidal (stations 3, 4 and 5, without mussels). The macroinfauna was numerically dominated by Polychaeta, Oligochaeta and Crustacea Peracarida. The total number of species collected was 14, being the most abundant the polychaete Perinereis vallata, oligochaetes from...
Tipo: Journal article
Palavras-chave: Mussel beds; Mytilus chilensis; Macroinfauna; Southern Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300007

Comparación ambiental, mediante registros sedimentarios, entre las condiciones prehispánicas y actuales de un sistema lacustre
Provedor de dados: 97
Autores: CISTERNAS,MARCO; TORRES,LAURA; URRUTIA,ROBERTO; ARANEDA,ALBERTO; PARRA,OSCAR.
Se comparan, a través de registros sedimentarios, palinológicos y diatomológicos, dos momentos de la historia ambiental del sistema lacustre de San Pedro. El primero, corresponde al periodo prehispánico, representando a las condiciones prístinas o línea base del sistema. El segundo periodo, el más reciente, representa aproximadamente a los últimos diez años de intervención antrópica. Para lograr lo anterior, se recolectaron muestras verticales de sedimento del fondo en los dos lagos del sistema lacustre de San Pedro (Lagunas Grande y Chica). Se realizaron análisis cronológicos (C14), palinológicos y diatomológicos de los estratos superiores e inferiores de la columna sedimentaria. Los resultados indican que el sistema lacustre de San Pedro ha experimentado...
Tipo: Journal article
Palavras-chave: Comparación ambiental; Registros sedimentarios; Diatomeas; Polen; Lagos.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100014

Comparación Antropométrica entre Mandíbulas de las Poblaciones Uruguaya y Brasileña
Provedor de dados: 77
Autores: Sassi,Carlos; Picapedra,Alicia; Caria,Paulo Henrique Ferreira; Groppo,Francisco; Francesquini Júnior,Luiz; Daruge Júnior,Eduardo; Prado,Felippe Bevilacqua.
Las mandíbulas humanas pertenecientes a la población uruguaya presentan ciertas diferencias anatómicas con las de la brasileña. Tal hecho parecería deberse a las particularidades raciales y étnicas de cada país. Este estudio examinó las características morfológicas de 100 mandíbulas de uruguayos y las cotejó con las correspondientes a idéntico número de piezas óseas de brasileños, por medio de trece mediciones estipuladas por Humphrey et al. (1999). Las variaciones significativas entre los valores promedios fueron determinadas mediante el test de Mann-Whitney (alfa=5%). Se constataron expresivas discrepancias entre algunas de las dimensiones analizadas, producto de las modificaciones de forma y estructura de las mandíbulas de ambos grupos. Las uruguayas...
Tipo: Journal article
Palavras-chave: Mandíbula; Morfología; Antropometría; Brasil; Uruguay.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200003

Comparación biométrica del lóbulo frontal en poblaciones americanas de Artemia (Anostraca, Artemiidae)
Provedor de dados: 97
Autores: DE LOS RIOS,PATRICIO R; ZUÑIGA,OSCAR.
Se compararon el diámetro del lóbulo frontal y su relación con la longitud corporal, en poblaciones de Artemia franciscana (Chile y Estados Unidos), A. persimilis (Argentina) y Artemia sp. (Chile), cultivadas en laboratorio bajo condiciones controladas. Se encontraron diferencias significativas en ambos parámetros entre las poblaciones de A. franciscana y Artemia sp., de Salina El Convento (Chile) y entre A. persimilis y Artemia sp. de Torres del Paine (Chile). Se discuten en el presente trabajo los factores geográficos, ecológicos y genéticos que determinaron la especiación de Artemia en Chile y Argentina, y como ésta se manifiesta en distintos patrones morfométricos
Tipo: Journal article
Palavras-chave: Población; Lóbulo frontal; Especie; Morfometría.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100004

COMPARACIÓN DE DOS MÉTODOS ALTERNATIVOS AL POZO BARRENO PARA LA MEDICIÓN DE LA CONDUCTIVIDAD HIDRÁULICA SATURADA (Ks) EN UN ALFISOL
Provedor de dados: 127
Autores: Pfeiffer,Marco; Haberland,Julio; Kremer,Cristian; Seguel,Oscar.
El presente estudio evaluó el uso de alternativas al método del pozo barreno (PB) para la medición de conductividad hidráulica saturada (K) en ausencia de un nivel freático. Se realizaron mediciones de K en un suelo estratificado de textura superficial franco arcillo limosa fina sobre un sustrato de gravas y piedras mediante los métodos del pozo barreno (PB), el método del cilindro infiltrómetro (CI) y el método del permeámetro de carga constante (PCC). Los valores obtenidos con el método del PCC reflejaron una alta variabilidad (CV=249%) y diferencias de hasta un orden de magnitud en el valor de K obtenido (Ksx=l,03 m dia-1). Los métodos del PB y el CI presentaron coeficientes deTrabajo realizado como Memoria de Título para optar al Título Profesional de...
Tipo: Journal article
Palavras-chave: Pozo Barreno; Cilindro Infiltrómetro; Permeámetro de Carga constante.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000300005

Comparación de Dos Métodos Radiológicos para Evaluación de Densidad Ósea en Mujeres Posmenopáusica
Provedor de dados: 77
Autores: Camargo,Angela Jordão; Arita,Emiko Saito; de Fernández,Magda Carolina Cortéz; Watanabe,Plauto Christopher Aranha.
Debido a la importancia del diagnóstico precoz de osteoporosis, fue objeto de este estudio realizar la comparación de dos métodos radiológicos convencionales para la evaluación de la densidad ósea en mujeres posmenopáusicas. Fueron seleccionadas imágenes de radiografía panorámica y de radiografía carpal, correspondiente a 68 pacientes de sexo femenino, con edades comprendidas entre los 49 y 80 años de edad, realizadas en la Clínica de Radiología Odontológica, para evaluación previa a la colocación de implantes. Para la interpretación de la densidad ósea en la mandíbula a través de las radiografías panorámicas fue utilizado el método del espesor cortical mandibular (PMI). Para la evaluación de las imágenes radiológicas obtenidas por la radiografía carpal,...
Tipo: Journal article
Palavras-chave: Radiogrametría; Radiografía carpal; Espesura cortical mandibular; Radiografía panorámicas; Densidad ósea.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200050

Comparación de dos Softwares en Histología Humana, como Utilización Complementaria a la Enseñanza Tradicional
Provedor de dados: 77
Autores: Schencke,Carolina; Hidalgo,Alejandra.
Actualmente, la formación de profesionales en la Educación Superior desafía a los docentes a incorporar en sus prácticas de enseñanza no solamente el dominio de contenido disciplinario puro, además, les exige competencias asociadas a la apropiación de conocimientos didácticos para guiar el saber disciplinario. El siguiente estudio pretende aportar con nuevas metodologías de aprendizaje en forma de softwares didácticos para los estudiantes que cursan la asignatura de Histología, de la carrera de Enfermería, Facultad de Ciencias de Salud de la Universidad Autónoma de Chile. Estos módulos interactivos se crearon como apoyo a las clases tradicionales de pasos prácticos con observación al microscopio. Para desarrollar el primer módulo, un total de 200 imágenes...
Tipo: Journal article
Palavras-chave: Histología; Docencia; Computación; Enseñanza.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400054

COMPARACIÓN DE DOS VARIEDADES FRANCESAS DE TRIGO SEMBRADAS EN CHILE
Provedor de dados: 113
Autores: Mellado Z.,Mario.
Se efectuó un ensayo de campo durante las temporadas 2000/01 y 2001/02 con el objeto de comparar algunas características agronómicas y la calidad de dos variedades de trigo (Triticum aestivum L.) harinero de invierno liberadas en Francia en distintos años. Se usó un arreglo de parcelas divididas dispuestas en un diseño de bloques completos al azar con cuatro repeticiones, con dos tratamientos de N (58 y 240 kg ha-1) y dos subtratamientos correspondiente a las variedades Capelle Desprez y Baroudeur. Los experimentos se establecieron en un suelo Andisol del Campo Experimental Santa Rosa (36°31’ lat. Sur, 71°54’ long. Oeste), perteneciente al Instituto de Investigaciones Agropecuarias (INIA), en el Centro Regional de Investigación Quilamapu, Chillán, Chile....
Tipo: Journal article
Palavras-chave: Triticum aestivum L.; Variedades; Capelle Desprez; Baroudeur; Rendimiento de grano; Componentes de rendimiento; Calidad del grano.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000400003

Comparación de Ecuaciones Antropométricas para Evaluar la Masa Muscular en Jugadores de Badminton
Provedor de dados: 77
Autores: Berral de la Rosa,Francisco José; Rodríguez-Bies,Elizabeth C; Berral de la Rosa,Carlos Javier; Rojano Ortega,Daniel; Lara Padilla,Eleazar.
Actualmente la cuantificación de la masa muscular es un área de estudio que ocupa distintas disciplinas científicas tanto de la salud como de las ciencias del deporte por ser un componente de la masa corporal que está en íntima relación con aspectos de la salud y del rendimiento deportivo. Existe una gran variedad de métodos y ecuaciones para su estimación pero la aplicación de las mismas no siempre resulta la más adecuada. El propósito de nuestro estudio es determinar la masa muscular en 37 jugadores de bádminton españoles, a través de técnicas antropométricas y hallar la fórmula más apropiada para dicha población. Fueron evaluadas 55 variables antropométricas: peso, estatura. perímetros, diámetros, longitudes, alturas y pliegues cutáneos. La composición...
Tipo: Journal article
Palavras-chave: Bádminton; Antropometría; Composición corporal; Masa muscular.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300022

COMPARACIÓN DE ENSILAJE DE TRIGO Y DE MAÍZ EN LA ENGORDA INVERNAL DE NOVILLOS
Provedor de dados: 113
Autores: Rojas G.,Claudio; Manríquez B.,Moisés.
Durante 72 días de la temporada invernal de 1998, se utilizaron 24 novillos Normando de 20 a 21 meses de edad y 385 kg de peso vivo (PV) promedio, con el objetivo de evaluar la respuesta animal al consumo de ensilaje de trigo (Triticum aestivum L.) cosechado en dos estados vegetativos, en comparación a ensilaje de maíz (Zea mays L.). Los tratamientos fueron T1: ensilaje de maíz; T2: ensilaje de trigo grano lechoso harinoso; y T3: ensilaje de trigo grano harinoso suave a duro. La alimentación estuvo constituída por la mezcla de ensilaje con concentrados, en la relación 62,5: 37,5, respectivamente. Los concentrados se formularon para cada ensilaje, con grano de avena (Avena sativa L.), lupino blanco (Lupinus albus L.), urea y sales minerales, de forma que la...
Tipo: Journal article
Palavras-chave: Ensilaje de trigo; Incremento de peso; Ensilaje de maíz.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000400006

COMPARACIÓN DE GRANO DE MAÍZ Y TRIGO BROTADO COMO COMPONENTES DE RACIONES DE ENGORDA INVERNAL DE NOVILLOS
Provedor de dados: 113
Autores: Rojas G.,Claudio; Hazard T.,Sergio; Hewstone M.,Cristian.
Durante 77 días de la temporada invernal de 2000 se utilizaron 28 novillos Overo Colorado de aproximadamente 19 meses de edad y 320 kg de PV promedio, con el objetivo de evaluar la respuesta animal al consumo de raciones de engorda formuladas con grano de trigo (Triticum aestivum L.) brotado y ligeramente brotado. Los tratamientos fueron T1: grano de maíz (Zea mays L.); T2: grano de trigo ligeramente brotado; T3: 50% de grano de trigo ligeramente brotado y 50% de trigo brotado; y T4: grano de trigo brotado. Las raciones se formularon aproximadamente isoproteicas (12,7%) e isoenergéticas (2,8 Mcal kg-1), con ensilaje de avena (Avena sativa L.) cosechada al estado de grano acuoso lechoso, grano de lupino blanco (Lupinus albus L.) y sales minerales. La...
Tipo: Journal article
Palavras-chave: Grano de trigo brotado; Incremento de peso; Novillos; Zea mays L.; Triticum aestivum L.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000400005

Comparación de la Composición Corporal y de la Masa Muscular por Segmentos Corporales, en Estudiantes de Educación Física y Deportistas de Distintas Disciplinas
Provedor de dados: 77
Autores: Rodríguez Rodríguez,Fernando Javier; Berral de la Rosa,Francisco José; Almagià Flores,Atilio Aldo; Iturriaga Zuleta,María Fernanda; Rodríguez Briceño,Fabián.
Las ecuaciones antropométricas para estimar la masa muscular, permiten obtener los valores de sólo la masa muscular total (MM total). En un reciente trabajo (Rodríguez et al., 2010), propone una ecuación para la estimación de la masa muscular de los miembros superiores e inferiores. Se evalúan 68 sujetos, estudiantes de educación física, rugbistas, futbolistas y gimnastas. El grupo de rugbistas presenta mayor cantidad de masa muscular en los miembros superiores (MMES) que el resto de los grupos. La MM total y la Masa muscular de los miembros inferiores (MMEI) son significativamente más altas en los rugbistas y futbolistas en comparación a los otros sujetos. La distribución de la masa muscular por regiones corporales es distinta entre las disciplinas...
Tipo: Journal article
Palavras-chave: Antropometría; Deporte; Educación física; Rugby; Fútbol; Gimnasia.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100001

Comparación de la morfología alar de Tadarida brasiliensis (Chiroptera: Molossidae) y Myotis chiloensis (Chiroptera: Vespertilionidae), representantes de dos diferentes patrones de vuelo
Provedor de dados: 97
Autores: CANALS,MAURICIO; IRIARTE-DÍAZ,JOSÉ; OLIVARES,RICARDO; NOVOA,F. FERNANDO.
La morfología alar de los quirópteros se encuentra relacionada por una parte con la biomecánica y energética del vuelo y por otra parte con aspectos ecológicos y conductuales (i.e., patrón de vuelo, conducta de forrajeo y selección de hábitat y de presas). En este trabajo se compara la morfometría alar de Tadarida brasiliensis (Molossidae) y Myotis chiloensis (Vespertilionidae), representantes de diferentes patrones de vuelo, buscando compromisos entre la morfometría alar y aspectos ecológicos y conductuales. Nuestros resultados muestran que T. brasiliensis es un murciélago más robusto, de mayor envergadura, pero con un área alar similar a la de M. chiloensis. Esta última especie tiene una menor variabilidad en su masa y área cortical del húmero, que...
Tipo: Journal article
Palavras-chave: Tadarida brasiliensis; Myotis chiloensis; Morfología alar; Vuelo; Biomecánica.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300015

COMPARACIÓN DE LA PRODUCCIÓN LÁCTEA DE TRES GRUPOS RACIALES DE OVEJAS EN LA ZONA CENTRO-SUR DE CHILE
Provedor de dados: 113
Autores: Avendaño R.,Julia; Fernández E.,Fernando; Sandoval P.,Claudio.
Buscando mejorar las perspectivas agropecuarias de la región, el estudio se basó en la caracterización lechera de tres grupos de ovejas: 50% Milchschaf (CMI), Suffolk (SU) y Local (LO), para lo cual se midió la producción láctea y composición química de la leche durante todo un período de ordeña (1998/99). La producción total de leche ordeñada fue 140,2; 104,2; y 125,4 L animal-1, en 181, 176 y 175 días de ordeña, y con una media diaria de 773; 589 y 706 mL animal-1 d-1, para CMI, SU y LO, respectivamente. La máxima producción de LO se obtuvo el día 12 de lactancia con una producción de 1.291 mL d-1. El grupo CMI presentó una fase ascendente hasta el día 69, con una máxima de 1.104 mL d-1, por debajo de LO, pero superior a SU, con 926 mL d-1en el día 25....
Tipo: Journal article
Palavras-chave: Lactancia; Milchschaf; Suffolk; Composición leche; Curvas de lactancia.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000400005

Comparación de la severidad de invasión asociada a caminos con diferentes niveles de perturbación en un bosque templado lluvioso del sur de Chile
Provedor de dados: 73
Autores: MARDONES,DANIELA; FUENTES,NICOL; SALDAÑA,ALFREDO.
La introducción de especies en áreas protegidas es un fenómeno promovido principalmente por actividad del hombre. Esto ha incrementado la preocupación por implementar métodos de evaluación de riesgo de invasión (&amp;#8216;Weed Risk Assessment&amp;#8217;: WRA) y estimar cuán invadido se encuentra un lugar (severidad de invasión, SI). Además, la diversidad de una comunidad podría regular la introducción de especies, lo cual es dependiente de la escala. A escala regional, la relación entre la riqueza de plantas nativas e introducidas es frecuentemente positiva, pues existe mayor heterogeneidad ambiental que permite el desarrollo de ambos tipos de especies. A escala local la relación sería negativa, debido a que la competencia interespecífica sería...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200006

Comparación de las Características Mecánicas Estáticas del Fémur Aislado de Perro, con y sin la Colocación de una Placa de Ortopedia Fabricada en Polipropileno
Provedor de dados: 77
Autores: Natali,J; Wheeler,J. T; Kohl,R; Varela,P.
Los objetivos generales fueron: evaluar resistencia a la compresión del fémur derecho aislado y del fémur izquierdo osteotomizado transversalmente fijado con una placa ortopédica fabricada en polipropileno, y comparar las características mecánicas estáticas entre ambos. Este trabajo se realizó mediante la confección de un modelo experimental de carga constituido por un fémur de mamífero (perro) en condiciones aisladas. Se utilizaron los huesos fémur de 13 perros mestizos, adultos jóvenes, de talla mediana a grande. Para los pruebas se utilizó una máquina servohidráulica para ensayos estáticos y dinámicos Amsler Wolpert. Se utilizó para el tratamiento de los datos, el test estadístico de diferencias de medias para muestras pareadas dependientes. Como...
Tipo: Journal article
Palavras-chave: Perro; Fémur; Placas ortopédicas.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400001

COMPARACIÓN DE MANEJOS PRATENSES DEL CENTRO-SUR DE CHILE UTILIZANDO VALORES BIOINDICADORES DE ELLENBERG
Provedor de dados: 73
Autores: San Martín,Cristina; Villagra,Johana; Novoa,Carla.
Se compararon dos manejos pratenses: pastoreo con vacunos y pastoreo con ovejas, en un suelo volcánico, del centro-sur de Chile, con los valores bioindicadores de Ellenberg establecidos para malezas europeas, que forman esas praderas. Se comprobó que el pastoreo con ovinos degrada el suelo y la cubierta vegetal mucho más que el pastoreo con bovinos, lo que se corresponde con las diferencias vegetacionales y edáficas establecidas por un estudio anterior mediante análisis edáficos y fitosociológicos. Con estos últimos se determinó que las diferencias entre ambos tipos de pastoreo establecieron dos asociaciones pratenses diferentes: Hyperico-Agrostietum capülariae (pastoreo de vacunos) y Airo-Agrostietum capülariae (pastoreo de ovejas). Se confirmó que muy...
Tipo: Journal article
Palavras-chave: Fitoindicadores; Praderas antropogénicas; Manejo del suelo; Pastoreo.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200004

Comparación de Metodologías de Cálculo de Propiedades Hidráulicas de un Suelo a Partir de Datos Medidos con Infiltrómetro de Disco
Provedor de dados: 113
Autores: Aoki,Antonio M.; Sereno,Roberto.
Los infiltrómetros de disco a tensión están siendo ampliamente usados para determinar propiedades hidráulicas in situ de suelos saturados o cercanos a la saturación. El objetivo de este trabajo fue comparar dos metodologías de cálculo de distintas propiedades hidráulicas del suelo a partir de datos medidos con infiltrómetros de disco a tensión. El ensayo se realizó sobre suelo reempaquetado de muestras extraídas del horizonte Ap de un suelo Haplustol típico, de textura franco-limosa. El infiltrómetro de disco utilizado fue del tipo que aplica agua con presiones menores o iguales a la presión atmosférica. Se utilizaron como metodologías de cálculo para distintas propiedades hidráulicas: a) el método propuesto por White y Sully, y b) el método propuesto por...
Tipo: Journal article
Palavras-chave: Conductividad hidráulica no saturada; Suelo reempaquetado.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200010

Comparación de protocolos de extracción de ADN con muestras de aleta y larva de peces: extracción modificada con cloruro de sodio
Provedor de dados: 118
Autores: Lopera-Barrero,Nelson M; Povh,Jayme A; Ribeiro,Ricardo P; Gomes,Patricia C; Jacometo,Carolina B; Silva Lopes,Tais da.
El uso de apropiados métodos de muestreo, tipo de tejido y la utilización de protocolos viables de extracción del ADN son aspectos críticos en estudios basados en PCR. Los métodos de extracción de ADN deben ser simples, reproducibles, económicos y no contaminantes. Este trabajo tuvo por objetivo comparar un protocolo modificado de extracción con sal común (NaCl) y un protocolo modificado de extracción con fenol-cloroformo para la obtención de ADN genómico en alta cantidad y calidad desde muestras de aleta y larva de pez (Brycon orbignyanus, Piaractus mesopotamicus, Oreochromis niloticus, Leporinus elongatus y Prochilodus lineatus). Las muestras aisladas de diferentes especies de peces usando la extracción con sal común permitieron obtener ADN de buena...
Tipo: Journal article
Palavras-chave: Amplificación por PCR; Estudios de peces; Investigación genética; Microsatélites; RAPD.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000100008

COMPARACIÓN DE RAPD Y AFLP COMO MÉTODOS DE IDENTIFICACIÓN GENÉTICA DE VID BASADOS EN EL ESTUDIO DE FRAGMENTOS GENÓMICOS ANÓNIMOS
Provedor de dados: 113
Autores: Narváez R.,Claudio; Valenzuela B.,Jorge; Muñoz Sch.,Carlos; Hinrichsen R.,Patricio.
Hasta hace un tiempo, los cultivares de vid sólo podían ser diferenciados en base a observaciones ampelográficas. Actualmente se dispone de numerosos métodos moleculares basados en PCR que permiten un exhaustivo análisis genético de las plantas analizando directamente su genoma y evitando de esta manera la interferencia de efectos ambientales. En este trabajo se presentan los resultados de la aplicación de dos de estos métodos, RAPD y AFLP, para estudiar la diversidad genética existente en un grupo de más de 50 cultivares de vid. Usando 18 partidores de RAPD se identificaron 103 bandas informativas, correspondiente a un 29,9% de polimorfismo. Por su parte, usando cuatro combinaciones de partidores de AFLP se obtuvieron 86 bandas informativas (29,6% de...
Tipo: Journal article
Palavras-chave: ADN; Genoma; Polimorfismo; Vides.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000400002

Comparación del cariotipo de Eucalyptus globulus y Eucalyptus cladocalyx (Myrtaceae)
Provedor de dados: 113
Autores: Mora,Freddy; Palma-Rojas,Claudio; Jara-Seguel,Pedro.
Se analizaron placas metafásicas mitóticas de Eucalyptus globulus Labill. y Eucalyptus cladocalyx F. Muell. Los cromosomas se observaron mediante aplastado de meristemas radiculares, previamente tratados con 8-Hidroxiquinolina y teñidos con la reacción de Feulgen. Las dos especies mostraron un cariotipo 2n = 22, con un nivel de simetría 1A y con tamaños cromosómicos que variaron entre 0,68 y 2,03 m m. El tamaño cromosómico promedio difirió significativamente al comparar entre E. globulus (1,42 m m) y E. cladocalyx (1,02 m m) (P &lt; 0,01). El mayor tamaño cromosómico de E. globulus sugiere una mayor cantidad de ADN, originado probablemente por alteraciones cromosómicas estucturales. Este patrón de evolución del cariotipo estaría asociado, además, con un...
Tipo: Journal article
Palavras-chave: Cromosoma; Citogenética vegetal.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100002

Comparación del Desarrollo Embrionario de Piaractus brachypomus (Serrasalmidae) y Pseudoplatystoma sp. (Pimelodidae)
Provedor de dados: 77
Autores: Díaz Olarte,John; Marciales-Caro,Lili J; Cristancho Vásquez,Freddy; Cruz-Casallas,Pablo E.
Pseudoplatystoma sp y Piaractus brachypomus son dos especies de peces dulceacuícolas endémicas de América del Sur de alto interés comercial como peces de cultivo. El objetivo de este trabajo fue comparar el desarrollo embrionario hasta la eclosión en estas dos especies. Para observar el desarrollo embrionario se incubaron oocitos fertilizados, obtenidos por inducción hormonal, en incubadoras de flujo ascendente tipo Woynarovich bajo condiciones controladas de calidad de agua. Los clivajes, la fase de blástula, gástrula hasta el cierre del blastoporo y eclosión en Pseudoplatystoma sp se observaron entre las 0:30 - 18:00 HPF, mientras que en P. brachypomus fue más rápida, observándose desde las 0:30 hasta las 14:00 HPF, siendo más homogénea que en...
Tipo: Journal article
Palavras-chave: Desarrollo embrionario; P. Brachypomus; Pseudoplatystoma sp.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400033

COMPARACIÓN ENTRE ANÁLISIS MORFOLÓGICOS Y DE ADN PARA LA IDENTIFICACIÓN DE ESPECIES DE Fusarium AISLADOS DE MELÓN (Cucumis melo L.)
Provedor de dados: 113
Autores: Riveros B.,Fernando; Muñoz,Gastón; González,Lucas; Rojas P.,Leonardo; Alvarez A.,Mario; Hinrichsen R.,Patricio.
Se evaluó la diversidad de especies de Fusarium asociadas con la marchitez del melón (Cucumis melo L.) mediante RAPD, comparándose tales resultados con la identificación taxonómica en base a caracteres morfológicos y patogénicos. Se estudiaron 18 aislamientos colectados de cultivos comerciales de melón establecidos entre la III y IV Región, Chile. Las observaciones morfológicas determinaron que once aislamientos correspondían a F. oxysporum, cuatro a F. semitectum, uno a F. solani y uno a F. subglutinans. Aislamientos identificados como F. oxysporum produjeron síntomas de marchitez solamente en plantas de melón, identificándolos, por lo tanto, como F. oxysporum f. sp. melonis (Fom). Los perfiles de ADN obtenidos mediante RAPD así como los análisis de...
Tipo: Journal article
Palavras-chave: RAPD; Diversidad genética.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000300004

Comparación entre Dos Métodos Utilizados para Medir la Curva Lumbar
Provedor de dados: 77
Autores: Yuing,F. T. A; Almagià,A. F; Lizana,P. J; Rodríguez,R. F. J; Ivanovic,D. M; Binvignat,G. O; Gallardo,L. R; Nieto,C. F; Verdejo,S. A.
Las alteraciones posturales tales como hiperlordosis, aumento de la cifosis, cifolordosis y escoliosis en columna, producen complicaciones a nivel músculo-esquelético y articular. Debido a esto, es que en el último tiempo ha aumentado el número de atenciones kinésicas por patologías de la columna lumbar, he aquí la importancia de un test clínico que cuente con la confiabilidad necesaria para determinar la curvatura lumbar. El objetivo de este estudio es determinar si existen diferencias en los resultados entre los dos métodos utilizados para medir la curva lumbar: el test clínico de las flechas sagitales y el ángulo de la columna lumbar mediante radiografías. En una muestra de 32 pacientes de edad promedio 44,93 (+/- 12,67 años) evaluados en el Servicio de...
Tipo: Journal article
Palavras-chave: Test de las flechas sagitales; Ángulo de la columna lumbar; Curva lumbar.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200028

Comparación entre el bosque templado austral y el bosque tucumano-boliviano considerando géneros con especies de hábito arbóreo
Provedor de dados: 73
Autores: Quiroga,María Paula.
Las áreas fitogeográficas del bosque tucumano-boliviano (BTB) de Argentina y Bolivia y el bosque templado austral (BTA) de Argentina y Chile están separadas por la diagonal árida (aproximadamente 2.000 km entre bosques). El objetivo de este trabajo es conocer cuántos géneros de especies con hábito arbóreo se distribuyen dentro de los bosques templado austral y tucumano-boliviano. En este trabajo se analiza y compara los géneros con especies de hábito arbóreo distribuidos en cada bosque. Además se indica el elemento biogeográfico para cada género. Se detectaron 125 y 29 géneros, en el BTB y en el BTA respectivamente, y los restantes 13 estaban presentes en ambos bosques. Los 167 géneros totales se distribuyeron en ocho elementos biogeográficos. Los...
Tipo: Journal article
Palavras-chave: Bosque templado austral; Bosque tucumano-boliviano; Disyunciones arbóreas sudamericanas; Géneros arbóreos; Historia biogeográfica sudamericana.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200003

Comparación entre Etil-cianoacrilato y Sutura Convencional en el cierre de incisiones de Piel de Conejo (Oryctolagus cuniculus)
Provedor de dados: 77
Autores: Vásquez,B; Schencke,C; Rodríguez,C; Veuthey,C; del Sol,M.
Las ventajas de los adhesivos en base a cianoacrilatos para uso en cierre de heridas cutáneas ha sido demostrada, pero escasos estudios reportan el uso del etil-cianoacrilato a nivel nacional. El objetivo fue comparar aspectos morfológicos de cicatrización en piel de conejo entre etil-cianoacrilato y sutura. Utilizamos 10 conejos machos adultos, divididos en 2 grupos de 5 animales, del Centro de Cirugía Experimental de la Universidad de La Frontera, Chile. Al grupo experimental se le realizaron dos incisiones, una en cada lado del dorso del tórax, 4 cm de largo, atravesando epidermis y dermis. La incisión derecha fue cerrada con etil-cianoacrilato, la izquierda con punto intradérmico de ácido poliglicólico. Se tomaron biopsias a los días 7, 14 y 21 días...
Tipo: Journal article
Palavras-chave: Conejo; Cicatrización; Etil-cianoacrilato; Sutura.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300004

COMPARACIÓN ENTRE GRANO DE MAÍZ Y TRIGO BROTADO EN RACIONES DE VACAS LECHERAS PARIDAS EN OTOÑO Y QUE CONSUMEN ENSILAJE DE MAÍZ
Provedor de dados: 113
Autores: Hazard,Sergio; Rojas,Claudio; Hewstone,Cristian.
En el Centro Regional de Investigación del Instituto de Investigaciones Agropecuarias-Carillanca se comparó el grano de maíz (Zea mays L.), con grano de trigo (Triticum aestivum L.) brotado, incorporado en el concentrado de vacas que consumían ensilaje de maíz más 4 kg de heno de alfalfa (Medicago sativa L.). Se utilizaron 8 vacas raza Frisón Negro Chileno por tratamiento. Se suministraron 7 kg de concentrado con 64% de grano de maíz (T1), 70% de grano de trigo con alto grado de brotación (T2), 74% de grano de trigo con brotación intermedia (T3) y 69% de grano de trigo ligeramente brotado (T4). Las raciones fueron isoproteicas e isoenergéticas. El diseño experimental fue de bloques completos al azar. No existieron diferencias significativas en producción...
Tipo: Journal article
Palavras-chave: Grano de trigo brotado; Alimentación de vacas lecheras; Triticum aestivum L.; Zea mays L.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000100003

COMPARACIÓN ENTRE LOS MÉTODOS DE LA PIPETA Y BOUYOUCOS Y SU RELACIÓN CON LA RETENCIÓN DE AGUA EN OCHO SUELOS DE LA ZONA ALTIPLÁNICA DE LA PROVINCIA DE PARINACOTA, CHILE
Provedor de dados: 113
Autores: Norambuena V.,Pablo; Luzio L.,Walter; Vera E,Wilfredo.
El objetivo de esta investigación fue comparar dos métodos, de la pipeta y Bouyoucos, para cuantificar la distribución y tamaño de partículas en suelos de regiones áridas frías. Para ello se muestrearon ocho suelos (29 muestras) del altiplano, en la Provincia de Parinacota. Con los resultados se efectuó un análisis de regresión lineal, se obtuvo la ecuación de la recta y el gráfico de dispersión correspondiente. Los resultados señalan que el contenido de carbono orgánico y el contenido salino tienen escasa influencia, principalmente a causa de los bajos contenidos de ambas variables. En cambio, Al ox + 1/2Fe ox que constituye uno de los parámetros que representa el grado de evolución de los vidrios volcánicos hacia minerales de ordenamiento de corto rango,...
Tipo: Journal article
Palavras-chave: Física de suelos; Suelos zonas áridas; Altiplano; Parinacota.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100015

Comparación entre Web of Science y Scopus, Estudio Bibliométrico de las Revistas de Anatomía y Morfología
Provedor de dados: 77
Autores: Hernández-González,V; Sans-Rosell,N; Jové-Deltell,M. C; Reverter-Masia,J.
El objetivo de este trabajo es comparar los indicadores bibliométricos básicos del área de anatomía y morfología dentro de las bases de datos de Web of Science (en adelante WoS) y Scopus. La metodología llevada a cabo se basa en una búsqueda bibliométrica realizada en Web of Knowledge y Scopus. La muestra la conforman el conjunto de revistas indexadas en ambas bases de datos del área citada. Los resultados indican que el número de revistas fue mayor en Scopus que en WoS (42 vs. 21). El índice citas/artículo global es mayor en Scopus. Solamente hay dos revistas que permiten publicar sus artículos en un idioma diferente al inglés en WoS y tres en Scopus. En WoS, los valores de factor de impacto y del índice h tienen una correlación de 0,17, mientras que en...
Tipo: Journal article
Palavras-chave: Bibliometría; Web of Science; Scopus; Revistas científicas; Anatomía y morfología.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400032

Comparación Histológica e Inmunohistoquimica de Muestras de Tejido Procesadas por la Técnica Convencional o por el Método Simplificado de Acetonas
Provedor de dados: 77
Autores: Martínez Rivera,Pablo; Piña Osuna,Ana Karina; Soto Domínguez,Adolfo; García Garza,Rubén.
La técnica convencional (TC) que usa alcohol como agente deshidratante, es un método útil en los laboratorios de Histología y Anatomía Patológica. Recientemente, un nuevo método simplificado con acetona (TA) fué diseñado en un intento por reducir el tiempo de procesamiento de los tejidos (de 12 a 4 horas), el costo de reactivos, y como un factor importante para tener un diagnóstico veraz y rápido. En este trabajo se compararon los parámetros histológicos e inmunohistoquímicos en muestras de cáncer de mama, colon y riñón tratadas con ambos métodos. Los cortes fueron teñidos con H &amp;amp; E o tricrómico de Masson. También se llevó a cabo inmunohistoquímica con anticuerpos especificos para la identificación de citoqueratinas AE1/AE3, el receptor de...
Tipo: Journal article
Palavras-chave: Alcohol; Acetona; Procesamiento histológico; Inmunohistoquímica.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200046

Comparaciones Morfológicas Entre las Mandíbulas de Brasileños y de Poblaciones de Otros Continentes
Provedor de dados: 77
Autores: Prado,Felippe Bevilacqua; Caria,Paulo Henrique Ferreira.
Las mandíbulas encontradas en diferentes regiones del mundo presentan considerables diferencias morfológicas, provocando dudas sobre las alteraciones y las características morfológicas de las mandíbulas humanas. La pluralidad racial y la consecuente mezcla de la población brasileña deben promover cambios morfológicos. Esta investigación analizó y comparó las características morfológicas de 100 mandíbulas humanas brasileñas con las dimensiones de las mandíbulas de individuos australianos, asiáticos, europeos y africanos, usando 13 dimensiones mandibulares definidas por Humphrey et al. (1999). Las diferencias significativas entre los valores medios fueran calculados través del test t student (p&lt;0,05 e 0,01). Hubo diferencias significativas en las...
Tipo: Journal article
Palavras-chave: Mandíbula; Morfología; Morfometría; Brasil.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200013

Comparative acute toxicity of gallium(III), antimony(III), indium(III), cadmium(II), and copper(II) on freshwater swamp shrimp (Macrobrachium nipponense)
Provedor de dados: 48
Autores: Yang,Jen-Lee.
BACKGROUND: Acute toxicity testing were carried out the freshwater swamp shrimp, Macrobrachium nipponense, as the model animal for the semiconductor applied metals (gallium, antimony, indium, cadmium, and copper) to evaluate if the species is an suitable experimental animal of pollution in aquatic ecosystem. RESULTS: The static renewal test method of acute lethal concentrations determination was used, and water temperature was maintained at 24.0&amp;#8201;±&amp;#8201;0.5°C. Data of individual metal obtained from acute toxicity tests were determined using probit analysis method. The median lethal concentration (96-h LC50) of gallium, antimony, indium, cadmium, and copper for M. nipponense were estimated as 2.7742, 1.9626, 6.8938, 0.0539, and 0.0313 mg/L,...
Tipo: Journal article
Palavras-chave: Macroburachium nipponense; Cu; Cd; Sb; Ga; In; LC50.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100013

COMPARATIVE ANALYSIS OF SPLIT-WINDOW ALGORITHMS FOR ESTIMATING SOIL TEMPERATURE
Provedor de dados: 127
Autores: Vera,Leonardo; Parra,Juan C; Morales,Luis; Mattar,Cristián; Jorquera-Fontena,Emilio.
The ability to estimate soil temperature (Ts) from satellite information is highly useful, since this is one of the main input variables in various models designed for estimating biophysical parameters. A comparative analysis is made of various Split-Window algorithms used to estimate soil temperature from data provided by the Advanced Very High Resolution Radiometer (AVHRR) sensor on board of satellites of the National Oceanic and Atmospheric Administration (NOAA). The algorithms compared are those proposed by: Prata and Platt (1991); Uliveri et al. (1992); Sobrino et al. (1993); Caselles et al. (1997); Sobrino and Raissouni (2000). The temperature estimates were validated with data of the soil temperature in situ recorded in a data logger installed in a...
Tipo: Journal article
Palavras-chave: AVHRR-NOAA Sensor; Meteorological station.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000100004

Comparative analysis of two immunohistochemical methods for antigen retrieval in the optical lobe of the honeybee Apis mellifera: Myosin-v assay
Provedor de dados: 48
Autores: CALÁBRIA,LUCIANA KAREN; TEIXEIRA,RENATA ROLAND; COELHO GONÇALVES,SYBELLI MAGDA; PASSOS LIMA,ANDREIA BARCELOS; SANTOS,ANA ALICE DINIZ DOS; MARTINS,ANTÔNIO ROBERTO; ESPINDOLA,FOUED SALMEN.
The present study compared two heating methods currently used for antigen retrieval (AR) immunostaining: the microwave oven and the steam cooker. Myosin-V, a molecular motor involved in vesicle transport, was used as a neuronal marker in honeybee Apis mellifera brains fixed in formalin. Overall, the steam cooker showed the most satisfactory AR results. At 100 ºC, tissue morphology was maintained and revealed epitope recovery, while evaporation of the AR solution was markedly reduced; this is important for stabilizing the sodium citrate molarity of the AR buffer and reducing background effects. Standardization of heat-mediated AR of formalin-fixed and paraffin-embedded tissue sections results in more reliable immunostaining of the honeybee brain.
Tipo: Journal article
Palavras-chave: Antigen retrieval; Microwave oven; Steam cooker.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000100002

Comparative Anatomical Description of Forearm and Hand Arteries of Cebus libidinosus
Provedor de dados: 77
Autores: Aversi-Ferreira,Tales Alexandre.
Recent data justify the insertion of Cebus on behavioral and evolutionary studies in relation to the human specie, reason why researches on behavior, memory, use of tools and encephalic index demonstrate that Cebus and chimpanzees are similar. Comparative anatomical studies between Cebus and chimpanzees based on anatomical data corroborate these data on evolutionary convergence associated to muscles, nerves and vessels of the thoracic members; however, the anatomy of the forearm and hand vessels has not yet been investigated in last years. The forearm and hand arteries of Cebus are identical to other here studied primates; however, the paknaris arch, which is only one in Cebus and baboons, and princeps pollicis artery, which originated from the paknaris...
Tipo: Journal article
Palavras-chave: Anatomy; Capuchin monkey; Cebus; Arteries; Forearm.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100037

Comparative Bilateral Bone Density of the Mandible Angle
Provedor de dados: 77
Autores: Issa,Joáo Paulo Mardegan; Tiossi,Rodrigo; Catirse,Alma Blásida Concepción Elizaur Benitez; Monteiro,Solange Aparecida Caldeira; Watanabe,Plauto Christhopher Aranha.
The aim of this study was to assess a bilateral comparison of the mandible density in both sex young patients with computer densitometry. Fifty panoramic radiographs were obtained from young patients with ages between 18 and 23 years old (group A = 25 female and group B = 25 male) standardized, using the same X-Ray equipment (Siemens, lOKvp, 7mA), scanned with a 282.110 pixels resolution, and transferred later to a computer and using the SIDEXIS (Sirona, USA) program to analyze the bone densitometry performance. Bilateral sites were standardized with the objective to measure the bone density. Obtained data were registered and submitted to statistical analysis. The following means and standard deviations were obtained, in pixels, for the right and the left...
Tipo: Journal article
Palavras-chave: Bone density; Mandible; Panoramic; X-ray; Radiography.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200016

Comparative effect of ion calcium and magnesium in the activation and infection of the murine macrophage by Leishmania major
Provedor de dados: 48
Autores: LANZA,HENRIQUE; AFONSO-CARDOSO,SANDRA R; SILVA,ADRIANO G; NAPOLITANO,DANIELLE R; ESPÍNDOLA,FOUED S; PENA,JANETHE D.O; SOUZA,MARIA A.
Amastigotes of Leishmania major have a great ability to evade destruction in host cells. This study investigated the activation in resident, inflammatory macrophages and J774 cells in vitro treated with lipopolysaccharide (LPS), soluble Leishmania antigen (SLA), calcium ionophore (CaI) and magnesium (Mg2+) alone or combined. An increase in nitric oxide (NO) production was observed in J774 or inflammatory macrophages treated with LPS alone or in combination with SLA and CaI. The same treatments did not affect the NO release by resident macrophages. There was no interference in uptake of L. major but CaI decreased intracellular proliferation of the parasite. This study demonstrated the importance of CaI in decreasing L. major proliferation inside murine...
Tipo: Journal article
Palavras-chave: Calcium; Leishmania major; Macrophage; Magnesium; Nitric oxide.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000300004

Comparative Efficacy of Different Weed Management Strategies in Wheat
Provedor de dados: 117
Autores: Ehsan Safdar,Muhammad; Asif,Muhammad; Ali,Amjed; Aziz,Ahsan; Yasin,Muhammad; Aziz,Mudassir; Afzal,Muhammad; Ali,Asghar.
Weed management programs should focus on environmental safety along with benefits to the farmer. We evaluated the effects of various weed control methods: ‘daab’ practice (stale seed bed technique), manual hoeing, and the chemical method (mixture of Buctril Super 60EC [bromoxynil + MCPA]0.45 kg ai ha-1 and Puma Super 75EW [fenoxaprop-P-ethyl] 0.75 kg ai ha-1) in combination with different planting geometries: 22.5 cm apart single row, 22.5 cm apart crisscross double row, 30 cm apart single row and broadcast sowings on weed control and grain yield of spring wheat (Triticum aestivum L.) var. Sehar 2006 at the University College of Agriculture, University of Sargodha, Pakistan, during the winters of 2009 and 2010. The chemical method, manual hoeing and ‘daab’...
Tipo: Journal article
Palavras-chave: Weed control; Sowing pattern; ‘daab’ practice; Crisscross sowing; Yield components.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200003

Comparative esterification of phenylpropanoids versus hydrophenylpropanoids acids catalyzed by lipase in organic solvent media
Provedor de dados: 69
Autores: Cassani,Julia; Luna,Héctor; Navarro,Arturo; Castillo,Edmundo.
The esterification of phenylpropanoid and hydrophenylpropanoid acids, catalyzed by candida antarctica lipase B (CAL-B), with several alcohols has demonstrated that the substitution pattern on the aromatic ring has a very significant influence on the reactivity of the carboxyl group due, mainly, to electronic effects, when compared to the unsaturated acids with the hydrogenated acids. It is also clear that in the saturated acids there still remain some unclear effects related to the aromatic substituents.
Tipo: Journal article
Palavras-chave: CAL-B; Electronic effects; Esterification; Lipase; Phenylpropanoid acids.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400004

COMPARATIVE FOLIAR EPIDERMAL MORPHOLOGY OF THE WEST AFRICAN SPECIES OF THE GENUS AFZELIA SMITH (LEGUMINOSAE: AESALPINIOIDEAE)
Provedor de dados: 73
Autores: Babalola Kadiri,Akeem; Dele Olowokudejo,James.
The epidermal features of the leaves of the six West African species of Afzelia were examined and compared using light and scanning electron microscopy. The leaves are hypostomatic in all species and stomatal type is paracytic. Anticlinal walls may be undulate or straight-curved and stomatal index ranges from 17.48% in A. bella var. gracilior to 25.20% in A. bipindensis. Porrect and flattened scales distinguish the infra-specific taxa of A. bella while presence of unicellular trichomes separates A. pachyloba from other species. The leaf surface is entirely covered by epicuticular wax deposits and the stomata are either raised or sunken in the genus. Using these foliar epidermal characters, an artificial key has been prepared to facilitate identification of...
Tipo: Journal article
Palavras-chave: Afzelia; Stomata; Epidermal cell; Morphology; Taxonomy.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100008

Comparative genetic structure in pines: evolutionary and conservation consequences
Provedor de dados: 97
Autores: DELGADO,PATRICIA; CUENCA,ARGELIA; ESCALANTE,ANA E.; MOLINA-FREANER,FRANCISCO; PIÑERO,DANIEL.
Pines have been the focus of several studies that estimate population genetic parameters using both allozymes and chloroplast single sequence repeats (SSRs). Also, the genus has also been recently studied using molecular systematics so that we now have a more clear understanding of their evolutionary history. With this background we studied comparatively the genetic structure in pines. Expected heterozygosity is particularly constant with a 99 % confidence interval between 0.19 and 0.23 in species that have been studied until now using allozymes. There is a significant proportion of species (9/41) that show high population differentiation estimates (Fst = or larger than 0.15) and five of these have large and wingless seeds probably associated with low...
Tipo: Journal article
Palavras-chave: Pinus; Genetic structure; Outcrossing rates; Microsatellites; Allozymes.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100004

Comparative in vivo antiangiogenic effects of calreticulin from Trypanosoma cruzi and Homo sapiens sapiens
Provedor de dados: 48
Autores: Toledo,Victor; Ramírez,Galia; Valck,Carolina; López,Nandy; Ribeiro,Carolina H; Maldonado,Ismael; Aguilar,Lorena; Lemus,David; Ferreira,Arturo.
Angiogenesis is a complex multi-step process of neovascularization arising from preexisting blood vessels whose generation is regulated by pro- and anti-angiogenic factors. Both Trypanosoma cruzi calreticulin (TcCRT) and its human counterpart (HuCRT) are antiangiogenic. This is the first report where the TcCRT and HuCRT anti-angiogenic properties are compared in vivo. In the chick embryonic chorioallantoid membrane assay (CAM) and at equimolar concentrations, TcCRT displayed significantly higher antiangiogenic activities than its human counterpart. LPS had marginal effects at the concentrations present in the recombinant protein preparations and the TcCRT antiangiogenic effects were largely inhibited by specific polyclonal antibodies, thus, reinforcing the...
Tipo: Journal article
Palavras-chave: Calreticulin; T. cruzi; Anti-angiogenesis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300004

Comparative Intestinal Histomorphology of Five Species of Phyllostomid Bats (Phyllostomidae, Microchiroptera): Ecomorphological Relations with Alimentary Habits
Provedor de dados: 77
Autores: Gadelha-Alves,Rafaela; Rozensztranch,Andréa Melo Da Silva; Rocha- Barbosa,Oscar.
The intestines of Sturnira lilium, Phyllostomus hastatus, Carolliaperspicillata, GlossophagasoricinaíindDesmodus rotundus were analized through macroscopic, morphometric and light microscopy studies. The species studied presented some common charactenstics generally found in bats, such as the absence of a caecum and an appendix. The frugivorous bat S. lilium has a longer intestine than the other species. The intestinal epithelium is of the simple columnar type, constituted of absorptive cells characterized by microvilli and goblet cells, which in all the species proved to be PAS + and AB +. These cells presented some differences in quantity and in distribution among the species. The intestinal mucosa presented morphologic and morphometric differences, such...
Tipo: Journal article
Palavras-chave: Intestines; Bats; Phyllostomidae; Histology; Histochemistry; Micrometry; Ecomorphology.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300014

Comparative Investigation of the Fetus and Adult Joint Ligament in the Knee and Elbow with Structural Levels
Provedor de dados: 77
Autores: Özen,Ü; Anil,A; Ömeroglu,S; Peker,T; Coskun,Z. K; Liman,Anil F.
The aim of this study was to examine and compare fetal and adult knee and elbow joint ligaments and determine histologically how these ligaments change over time. In addition, the images of fetal and adult joint ligaments were examined with magnetic resonance imaging (MRI). This study was conducted on 10 male fetus ranging from ages 14 to 17.5 weeks, two adult male cadavers obtained from Gazi University Faculty of Medicine Department of Anatomy and MR images of the knee and elbow regions of 10 male adults obtained from Atatürk Educational and Research Hospital between 2009 and 2011. In the present study, the sections taken from knee and elbow of ten 14­17.5 week old fetuses and the ligaments of tissue taken from the knee and elbow of two male cadavers...
Tipo: Journal article
Palavras-chave: Knee ligaments; Elbow ligaments; Magnetic resonance; Collagen fibers; Fibroblast.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400050

COMPARATIVE MORPHOLOGY AND ANATOMY OF THE LEAF AND STEM OF PEPEROMIA DAHLSTEDTII C.DC., OTTONIA MARTIANA MIQ. AND PIPER DIOSPYRIFOLIUM KUNTH (PIPERACEAE)
Provedor de dados: 73
Autores: Souza,L. A.; Moscheta,I. S.; Oliveira,J. H. G.
The genera and species of Piperaceae show a considerable structural diversity of leaves and especially stems. This paper presents a comparative morphological and anatomical study of the leaves and stems of three common Brazilian species of this family (Peperomia dahlstedtii C.DC., Ottonia martiana Miq. and Piper diospyrifolium Kunth), the vegetative organs of which have previously been little studied. The collected plant material was fixed in FAA, cut freehand and stained in safranin and astra blue. P. dahlstedtii is an epiphyte and has a herbaceous stem with whorled leaves phyllotaxis and a polystelic structure, a multiseriate adaxial leaf epidermis and calcium oxalate monocrystals in parenchyma and collenchyma petiole cells. O. martiana and P....
Tipo: Journal article
Palavras-chave: Crystal cells; Epidermis; Stele; Petiole.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000100002

Comparative Morphometric Study of the Filiform Lingual Papilla in the Middle East Blind Mole Rat (Spalax ehrenbergi, Nehring, 1898) and Wistar Albino Rat
Provedor de dados: 77
Autores: Karakoç,Zelal; Ketani,Sennur; Ketani,M. Aydin; Kilinç,Mehmet.
This study aimed to reveal the morphometric differences between blind mole rats which live under ground and rats which live under laboratory conditions with regard to the length, base width, keratinization thickness and microscopic papilla depth. For this purpose, 7 adult blind mole rats and 7 adult Wistar albino rats were used in the study. All tongues were removed and fixed in 10 % neutral formalin. 4-5 micrometer of sections were obtained from paraffine sections which were obtained with routine histological follow ups and Crossman's modified triple staining was applied. While papilla length was found as 184.73±26.68 µm, base width 65.46±16.51 µm, keratinization thickness 11.60±1.37 µm, microscopic papilla depth 49.89±8.19 µm in blind rats; these values...
Tipo: Journal article
Palavras-chave: Blind Mole Rat; Filiform lingual papilla; Morphometry.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200028

Comparative Morphometry of the Olfactory Bulb, Tract and Stria in the Human, Dog and Goat
Provedor de dados: 77
Autores: Kavoi,Boniface M; Jameela,Hassanali.
Morphometric parameters of olfactory brain components show species-dependent variations. However, the association of these parameters with olfactory function vis-à-vis ecological and evolutionary behaviors is poorly understood. In this study, a morphometric analysis of the olfactory bulb, tract and stria was carried out in three ecologically diverse animals comprising humans (primate), dogs (carnivore) and goats (herbivore) to elucidate differences in morphometry in relation to olfactory function. Using formalin-fixed brains, volumes and linear measurements of the olfactory structures were determined and correlated with those of cerebrum and the whole brain. The volume of the olfactory bulb was greatest in dogs, followed by goats and humans and constituted...
Tipo: Journal article
Palavras-chave: Morphometry; Olfactory brain; Human; Dog; Goat.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300047

Comparative Osteometric Study of Long Bones in Yankasa Sheep and Red Sokoto Goats
Provedor de dados: 77
Autores: Salami,S. O; Ibe,C. S; Umosen,A. D; Ajayi,I. E; Maidawa,S. M.
A morphometric study was undertaken on the long bones in the two predominant breeds of small ruminant in Northern Guinea Savanna zone of Nigeria, to determine their anatomical differences and thus, provide a means of differentiating the remains of these two species during zooarchaeological studies and gross anatomy practical session. The pelvic and pectoral limbs from thirty animals (15 Yankasa sheep and 15 Red Sokoto goats) of both sexes were used for this study. The long bones of the pectoral limbs considered were the humerus, radius, ulna and metacarpal III while those of the pelvic limbs were the femur, tibia and metatarsal III. The parameters considered were the mean weights, lengths and diameters of the proximal extremity, mid-shaft and distal...
Tipo: Journal article
Palavras-chave: Yankasa sheep; Red Sokoto goat; Long bones.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100017

Comparative proteome analysis of Brettanomyces bruxellensisunder hydroxycinnamic acid growth
Provedor de dados: 69
Autores: Carmona,Lourdes; Varela,Javier; Godoy,Liliana; Ganga,María Angélica.
Background: Brettanomyces bruxellensis is an important spoilage yeast in the winemaking process. The capacity of this yeast to generate an undesired off-flavor constitutes a significant loss in the Chilean wine industry. Results: The proteomic profile of B. bruxellensis in the presence of p-coumaric acid was determined by 2D gel electrophoresis, gel image analysis and differential spot selection. A set of 41 proteins showed a differential accumulation of ±2 and a p-value &lt;0.0001. The homology sequence analysis was performed using the databases available. Differential proteins belonged to the categories of 'energy production and conversion' and 'amino acid transport and metabolism'. Conclusions: The proteomic profile of B. bruxellensis cultivated in the...
Tipo: Journal article
Palavras-chave: Ethylphenols; Metabolic flux regulation; Proteomics; Spoilage yeast; Wine alterations; Wine industry.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500005

Comparative proteomic analysis of different developmental stages of the edible mushroom Termitomyces heimii
Provedor de dados: 48
Autores: Norasfaliza Rahmad,Jameel R Al-Obaidi; Rashid,Noraswati Mohd Nor; Zean,Ng Boon; Yusoff,Mohd Hafis Yuswan Mohd; Shaharuddin,Nur Syahidah; Jamiland,Nor Azreen Mohd; Saleh,Norihan Mohd.
BACKGROUND: Termitomyces heimii is a basidiomycete fungus that has a symbiotic relationship with termites, and it is an edible mushroom with a unique flavour and texture. T. heimii is also one of the most difficult mushrooms to cultivate throughout the world. Little is known about the growth and development of these mushrooms, and the available information is insufficient or poor. The purpose of this study was to provide a base of knowledge regarding the biological processes involved in the development of T. heimii. The proteomic method of 2 dimensional difference gel electrophoresis 2D-DIGE was used to determine and examine the protein profiles of each developmental stage (mycelium, primordium and fruiting body). Total proteins were extracted by...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100030

Comparative Quantitative and Qualitative Attributes of the Surface Respiratory Macrophages in the Domestic Duck and the Rabbit
Provedor de dados: 77
Autores: Mutua,P. M; Gicheru,M. M; Makanya,A. N; Kiama,S. G.
In mammals, surface respiratory macrophages (SM) are known to play a foremost role in protecting the respiratory system by providing first line of defense through engulfing pathogens and particulate matter respired with air. It has been reported that the pulmonary cellular defense system of domestic birds is inadequate. In particular, low number of SM and even lack of the cells in a healthy avian respiratory system have been associated with susceptibility of domestic birds to respiratory diseases. In an endeavor to resolve the existing controversy, the quantitative and qualitative attributes of the surface respiratory macrophages of the domestic duck and of the domestic rabbit were compared under similar experimental conditions. Quantitatively, the rabbit...
Tipo: Journal article
Palavras-chave: Avian; Cellular defense; Lung; Phagocytosis; Rabbit; Surface macrophages.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200008

Comparative Scanning Electron Microscopy of Platelets and Fibrin Networks of Human and Differents Animals
Provedor de dados: 77
Autores: Pretorius,E; Vieira,W. A; Oberholzer,H. M; Auer,R. E. J.
The purpose of the present study was to compare the platelet and fibrin network ultrastructure of humans to eight different animal species in order to determine the differences between human and animal platelet and fibrin morphology, and to determine whether the animals studied differ in their platelet and fibrin morphology, and whether these differences can be observed by scanning electron microscopy. Platelets and fibrin networks play an important role both in the coagulation process as well as physiologically in allergic processes and immunological mechanisms. The thickness of human fibrin networks were compared to mouse (Mus musculus), equine (Equus caballus), vervet monkey (Chlorocebus aethiops previously Cercopithecus aethiops), oryx (Oryx gazella),...
Tipo: Journal article
Palavras-chave: Scanning electron microscopy; Platelets; Fibrin networks; Human; Animals.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100013

Comparative study for the kinetics of extracellular xylanases from Trichoderma harzianum and Chaetomium thermophilum
Provedor de dados: 69
Autores: Ahmed,Sibtain; Imdad,Syeda Sana; Jamil,Amer.
Xylanases assume special importance in the paper and pulp industry as they replace toxic chemicals such as chlorine and chlorine dioxide for developing eco-friendly processes. This study evaluated xylanases produced by two fungi, the mesophilic fungus Trichoderma harzianum and a thermophilic fungus Chaetomium thermophilum. Among the polymeric substrates studied for xylanase production by both the fungi, birch wood xylan was found to be the best inducer of xylanases. Xylanases induction was subject to glucose repression. Partially purified xylanases preparation from T. harzianum and C. thermophilum exhibited optimal activities at pH 5 and 6 and at 60ºC and 70ºC, respectively. The apparent Km and Vmax values for the partially purified xylanase from T....
Tipo: Journal article
Palavras-chave: C. thermophilum; Kinetics; T. harzianum; Xylanase.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300003

Comparative Study of Anthropometric Measurement and Body Composition between Elite Soccer and Basketball Players
Provedor de dados: 77
Autores: Popovic,Stevo; Akpinar,Selçuk; Jaksic,Damjan; Matic,Radenko; Bjelica,Dusko.
The purpose of this study was to describe anthropometric characteristics and body composition of elite soccer and basketball players as well as to make comparisons between them. Seventy-one males were enrolled in the study, divided into three groups: twenty-six soccer players, fourteen basketball players and thirty-one healthy sedentary subjects. All subjects were assessed for the anthropometric measures required for the calculation of body composition variables, using the standardized procedures recommended by established literature. Data was analyzed using SPSS and the descriptive statistics were expressed as a mean (SD) for each variable, while the ANOVA and LSD Post Hoc tests were carried out to detect the effects of each type of sport. The results...
Tipo: Journal article
Palavras-chave: Sport; Top-Level; Football; Basket; Male.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200016

Comparative Study of Anthropometric Measurement and Body Composition between Elite Soccer and Volleyball Players
Provedor de dados: 77
Autores: Popovic,Stevo; Bjelica,Dusko; Jaksic,Damjan; Hadzic,Rasid.
The purpose of this study was to describe anthropometric characteristics and body composition of elite soccer and volleyball players as well as to make comparisons between them. Seventy-one males were enrolled in the study, divided into three groups: twenty-six soccer players, fourteen volleyball players and thirty-one healthy sedentary subjects. All subjects were assessed for the anthropometric measures required for the calculation of body composition variables, using the standardized procedures recommended by established literature. Data was analyzed using SPSS and the descriptive statistics were expressed as a mean (SD) for each variable, while the ANOVA and LSD Post Hoc tests were carried out to detect the effects of each type of sport. The results...
Tipo: Journal article
Palavras-chave: Sport; Top-Level; Football; Volleyball; Male.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100044

Comparative Study of Cranial Capacity of the Non-tribal with Korku Tribal Population of Madhya Pradesh, India
Provedor de dados: 77
Autores: Gohiya,Vineet Kumar; Shrivatava,Sudha; Gohiya,Sarita.
Knowledge of cranial capacity is useful in differentiation of racial and sexual differences, which indirectly reflects the brain volume in different populations. Most of these studies have been done on the dry skulls using linear dimensions. Only few studies have been done on living subjects. The aim of this study was to compare cranial capacity of particular age group of Korku tribe &amp;amp; Non-tribal population of Madhya Pradesh a state of India. This study was carried on 800 healthy volunteer of 20 - 25 year-old age group (in which each 400 males and females) in Korku tribe and Non-tribal population of Madhya Pradesh state of India, by using linear dimensions of head (Lee Pearson's formula). The mean cranial capacity and SD in Non-tribal males and...
Tipo: Journal article
Palavras-chave: Anthropometry; Cranial capacity; Skull; Sex; Tribe.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100047

Comparative study of inter-and intrahemispheric cortico-cortical connections in gerbil auditory cortex
Provedor de dados: 48
Autores: THOMAS,HARDY; LÓPEZ,VLADIMIR.
Topographic distributions and laminar pattern of cortico-cortical projections from the primary auditory field (AI), anterior auditory field (AAF), dorsoposterior field (DP), ventroposterior field (VP), dorsal field (D) and ventral field (V) were studied in relation to tonotopic maps in combined anatomical, electrophysiological and 2-deoxyfluoro-D-glucose (2DG) experiments. Distributions of axons were examined by means of retrogradely-transported fluorescent tracer Fast Blue (FB) injected in the primary (AI) and anterior (AAF) auditory field. Injections of fluorescent tracer were placed in electrophysiologically-identified locations of AI and AAF. Neurons in AAF, DP, VP and V project to AI in the ipsilateral hemisphere. This area also receives projections...
Tipo: Journal article
Palavras-chave: Auditory cortex; Cortical connections; Laminar patterns; Fluorescent tracer-retrograde labeling.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000200006

Comparative study of moss diversity in South Shetland Islands and in the Antarctic Peninsula
Provedor de dados: 97
Autores: Putzke,Jair; Athanásio,Camila G; Albuquerque,Margéli Pereira de; Victoria,Filipe C; Pereira,Antonio B.
BACKGROUND: This paper presents a comparative study of moss diversity in three collection sites in the South Shetland Islands (King George, Elephant, and Nelson Islands) and one in the Antarctic Continent (Hope Bay, Antarctic Peninsula). In the King George, Elephant, and Nelson Islands, the collections were done in ice-free areas during the austral summers of years 1988,1989, 1990, 1991, 1992, and 1994. In Hope Bay, the collections were done in the 2009 summer (February). All collections were deposited in the HCB (Chaves Batista Herbarium). FINDINGS: The King George Area is the most diverse area and the Hope Bay has the lowest diversity stats. The diversity stats for each region and the similarities between both are presented. CONCLUSION: This results...
Tipo: Journal article
Palavras-chave: Bryophyta; Flora; Ice-free area; Shannon-Weaver index.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2015000100006

Comparative study of shell choice by the southern endemic hermit crab Loxopagurus loxochelis from Brazil and Argentina
Provedor de dados: 97
Autores: BIAGI,RENATA; MEIRELES,ANDREA L; SCELZO,MARCELO A; MANTELATTO,FERNANDO L.
This study aimed to determine the shell choice pattern of the southern Atlantic endemic hermit crab Loxopagurus loxochelis from two different biogeographic provinces in Brazil and Argentina. Size and shell species preferences were determined for the two most occupied shell types (i.e., Olivancillaria urceus and Buccinanops gradatum) in Caraguatatuba region (Brazil) and in Mar del Plata (Argentina). Shell occupation was analyzed considering the biometric characteristics of shells, the occurrence of shell types, and the preference of the hermit crabs for the most frequently occupied shell species. Samples were taken using otter trawl in the infralittoral area of both regions and the animals captured were measured and weighed. Shells were identified, weighed,...
Tipo: Journal article
Palavras-chave: Shell preference; Anomura; Loxopagurus loxochelis.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000400007

Comparative Study of the Cephalic Index of the Population from the Regions of the North and South of Brazil
Provedor de dados: 77
Autores: Alves,H. A; Santos,M. I. M. P; Melo,F. C. L; Wellington,R.
Since the beginning of the century in various countries, investigations to determine the anthropometric characteristics of a population were carried out. The issue of miscegenation in Brazil is of great importance in this study to define a population representative data on the cranial anthropometry. The large size of Brazil, with 8.514.876 km2 leads to an investigation between the two extreme regions of the country: North and South, because of the ethnic composition of their colonizers. This study aims to investigate, compare and rank possible differences in cephalic index of the populations from these regions of Brazil. Therefore, an anthropometric study was performed at the School of Aeronautics Expert (single training center for graduates of Brazilian...
Tipo: Journal article
Palavras-chave: Anthropometry; Cephalometry; Cephalic index.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400050

Compared Morphology of the Cephalic Musculature in Five Species of Genus Urotrygon (Chondrichthyes: Urolophidae)
Provedor de dados: 77
Autores: González Isáis,Mónica; Montes Domínguez,Héctor Marcos.
This work aims to describe the morphology of dorsal and ventral cephalic musculature in five species of genus Urotrygon. Muscular differences were observed, mainly in the development level. Muscles showing certain degree of variation in the dorsal region were the cucullaris and the ethmoideo-parethmoidalis. In ventral view, higher variation was observed. Muscles showing differences were the depressor rostri, the depressor hyomandibularis, the preorbitalis medial, the coracohioideus, and the depressor mandibularis. Urotrygon aspidurus was the species with the largest differences, as it has no mandibular depressor, and the rostral depressor is quite developed. The shape and arrangement of cephalic musculature in Urotrygon is similar to that reported for...
Tipo: Journal article
Palavras-chave: Elasmobranchii; Batoidei; Urotrygon; Cephalic musculature.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100001

Comparing the expression of human DNA topoisomerase I in KM71H and X33 strains of Pichia pastoris
Provedor de dados: 69
Autores: Ping,Ruo; Sin Teoh,Leong; Kwai Chan,Mooi; Miswan,Noorizan; Yin Khoo,Boon.
Background: Human is an essential cellular enzyme that is found in all human cells. As this enzyme is upregulated in cancer cells exceedingly, it is used as a target for cancer chemotherapeutic drug development. As such, producing the in-house enzyme for the purpose to speed up the search for more cost-effective and target specific hTopoI inhibitors is warranted. This study aims to compare the optimised conditions for the expression of hTopoI in KM71H (MutS) and X33 (Mut+) strains of Pichia pastoris. P. pastoris transfected with an hTopoI recombinant vector was used for the optimization of a higher level of hTopoI expression. Results: In the process, fed-batch cultivation parameters that influence the expression of hTopoI, such as culture temperature,...
Tipo: Journal article
Palavras-chave: Cell density; Pichia pastoris; Total protein concentration; Recombinant protein expression.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300001

Comparison and Characterization of Garlic (Allium sativum L.) Bulbs Extracts and Their Effect on Mortality and Repellency of Tetranychus urticae Koch (Acari: Tetranychidae)
Provedor de dados: 117
Autores: Hincapié Ll,Carlos Augusto; López P,Gloria Eugenia; Torres Ch,Ricardo.
Tetranychus urticae Koch is a pest that causes great economic losses because it attacks a wide range of host plants. Also, some populations have developed resistance against commercial acaricides. This work compares different extracts from garlic (Allium sativum L.) bulbs measuring their toxicity and repellency effects on T. urticae. Extracts were obtained using as solvents CO2 in supercritical conditions (CSC), ethanol and petroleum ether using soxhlet and soaking methods and soaking in water. The supercritical fluid extraction technique allows for obtaining extracts at low temperature using high pressures, avoiding compound degradation and making possible solvent separation by exposing the extract at room temperature. Mites were bred on bean plants...
Tipo: Journal article
Palavras-chave: Two-spotted spider mite; Plant extracts; Miticidal effect; Liliaceae.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400001

Comparison between circadian motor activity in pony and horse
Provedor de dados: 97
Autores: PICCIONE,GIUSEPPE; GIANNETTO,CLAUDIA; MARAFIOTI,SIMONA; CASELLA,STEFANIA; CAOLA,GIOVANNI.
In this study we investigated the influence of body mass on the daily rhythm of total motor activity in ponies and horses. Six clinically healthy Shetland pony breed with a body mass of 180 ± 30 kg and six healthy horses Sella Italiana breed with a body mass of 530 ± 20 kg were used. Animals were equipped with actigraphy-based data loggers, Actiwatch-Mini® to record total activity. The application of two-way ANOVA showed a highly significant effect of time of day and body mass on motor activity. Cosinor analysis identified the periodic parameters and their acrophases during the two days of monitoring. Mesor and amplitude were statistically higher in horses than in ponies and no statistically significant differences was found about acrophases and...
Tipo: Journal article
Palavras-chave: Body mass; Daily rhythm; Equus caballus; Locomotor activity.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200010

Comparison between Impact Factor, Eigenfactor Score, and SCImago Journal Rank Indicator in Anatomy and Morphology Journals
Provedor de dados: 77
Autores: Cantín,Mario; Muñoz,M; Roa,Ignacio.
The Impact Factor (IF) is considered the best quality indicator for evaluation of scientific journals but has been criticized on many accounts, and its limitations have already been described extensively. New bibliometrics indicators, accepted by the scientific community, has been considered to evaluate quality ranking for journals using more complex algorithms and other databases. The aim of this study was to evaluated three indices of journal scientific impact: (IF), Eigenfactor Score (ES), and SCImago Journal Rank indicator (SJR), of mainstream Anatomy and Morphology journals in 2014. Specific anatomical and morphological journals were selected from Anatomy &amp;amp; Morphology category of Web of Science. The 2014 IFs and ESs were obtained from Journal...
Tipo: Journal article
Palavras-chave: Impact Factor; Anatomy and Morphology; Eigenfactor Score; SCImago Journal Rank indicator.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300060

Comparison of Agility and Dynamic Balance in Elderly Women with Endomorphic Mesomorph Somatotype with Presence or Absence of Metabolic Syndrome
Provedor de dados: 77
Autores: Ochoa Martínez,Paulina Yesica; Hall López,Javier Arturo; Alarcón Meza,Edgar Ismael; Rentería,Iván; Botelho Teixeira,Ana María Miranda; Lara Zazueta,Humberto; Martin Dantas,Estélio Henrique.
Physical function declines in efficiency with advancing age, contributing to disability. Furthermore, metabolic syndrome is a common illness in elderly populations, somatotayping is a technique for description of the physique and can establish a relation with performance and pathology. The aim of this work was to compare the agility, dynamic balance in elderly women with endomorphic mesomorph somatotype with presence or absence of metabolic syndrome. A sample of 18 volunteers was obtained (age 66.5±4.7 years old), all were elderly sedentary women. They were assessed whit anthropometric variables in accordance with ISAK protocol in order to determine Heath &amp;amp; Carter somatotype; presence of metabolic syndrome they were evaluated according with the...
Tipo: Journal article
Palavras-chave: Somatotype; Elderly; Metabolic Syndrome; Agility; Dynamic Balance.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200046

Comparison of Amphotericin B Lipid Complex (Abelcet) and Liposomal Amphotericin B (Ambisome) on Rat Kidney: a Morphological Evaluation
Provedor de dados: 77
Autores: Mutluay,S. Deniz; Karakas,Pinar; Tasova,Yesim; Mete,Ufuk; Bozkir,M. Gülhal.
The aim of our study was to compare the nephrotoxic effects of liposomal Amphotericin B (Ambisome) and Amphotericin B lipid complex (Abelcet) on rat kidneys at short (14 days) and long term (28 days) treatment applications. Thirty-six male Wistar rats were included and divided into six groups (n=6). Groups 1 and 4 are composed as control groups by administrating intraperitoneal (ip) 0, 9 molar Serum physiologic for a period of 14 and 28 days respectively. Group 2 and 3 are treated with 5 mg/kg Ambisome and 5 mg/kg Abelcet for 14 days respectively, Group 5 and 6 are treated with same agents for 28 days respectively. Then, the rats were transcardially perfused, samples were taken from cortex and medulla regions of kidneys. The micrographs of group 1 and 4...
Tipo: Journal article
Palavras-chave: Amphotericin B lipid formulations; Rat kidney; Nephrotoxicity; Ultrastructure.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200033

Comparison of Antioxidant Effects of Kolaviron and Vitamin C Interventions on Testicular Structures Following Nevirapine Administration in Sprague-Dawley Rats
Provedor de dados: 77
Autores: Ajayi,S. A; Azu,O. O; Chuturgoon,A; Phulukdaree,A; Komolafe,O. A; Ofusori,D. A.
Testicular toxicity has been implicated in highly active anti-retroviral therapy (HAART) treatment. Hence there is need to identify an effective antioxidant product that can alleviate testicular necrosis due to HAART administration. Forty eight adult male Sprague-Dawley rats were used in this study. The animals were divided into eight (8) groups: A-H (n= 6). Group A animals received normal saline as the control; Group B was given Nevirapine (Nv); Group C was given Kolaviron (Kv); Group D was given vitamin C; Group E was given Nv and Kv; Group F was given Nv and Vitamin C; Group G was given Nv for 56 d and Kv for 28 d serving as a withdrawal group; Group H was given corn oil. Nv, Kv and Vit. C were given at 1.54, 200 and 250 (mg·kg)/bw respectively while...
Tipo: Journal article
Palavras-chave: Nevirapine; Kolaviron; Testicular toxicity; Sperm count; Antioxidant enzymes.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100016

COMPARISON OF BATHYMETRIC FEATURES DETECTED BY ERS2 SAR AND LANDSAT TM DATA OVER SAN MATÍAS GULF, ARGENTINA
Provedor de dados: 72
Autores: Gagliardini,Domingo A; Dogliotti,Ana I; Karszenbaum,Haydée; Grings,Francisco.
It is well known that Synthetic Aperture Radar (SAR) is capable of imaging bathymetric features by detecting changes in sea surface roughness associated with bathymetry-induced surface current modulations. The high dynamic range of LANDSAT Thematic Mapper (TM) and Enhanced TM+ (ETM+) sensors allow them to observe oceanic surfaces affected by solar specular reflection, or sun glint, without being saturated. This ability allows the imaging of sea surface roughness patterns in the sun glint affected area that are associated with surface current changes such as those produced by bathymetric features. ERS SAR and LANDSAT TM/ETM+ images obtained over the San Matías Gulf, Argentina during similar tidal current conditions are compared and the surface signature...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200036

Comparison of Behavior, Morphology and Morphometry of Equine and Canine Adipose Derived Mesenchymal Stem Cells in Culture
Provedor de dados: 77
Autores: Grzesiak,Jakub; Marycz,Krzysztof; Czogala,Joanna; Wrzeszcz,Karol; Nicpon,Jakub.
Recent studies revealed multipotent properties of fat tissue isolated mesenchymal stem cells. These cells are successfully used as therapeutic factor for many locomotive disorders, being even more effective than stem cells from bone marrow. Isolated and cultured, AD-MSCs were observed, photographed and measured to compare cells from two different species.
Tipo: Journal article
Palavras-chave: AD-MSC; Behavior; Morphology; Morphometry.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300059

Comparison of Bone Graft Healing Between Autogenous Bone, Blood Clot and Anorganic Bovine Bone Matrix: Radiographic and Histological Analyses
Provedor de dados: 77
Autores: Olate,Sergio; Duque Netto,Henrique; Klüppel,Leandro E; Vásquez,Bélgica; Miranda Chaves,Maria das Graças A; del Sol,Mariano.
Surgical procedures involving the rehabilitation of the maxillofacial region frequently require use of bone grafts. Bone graft follow-up is generally done through clinical analysis and especially through image tests, although few studies specifically correlate both. The object of this research was to establish a relation between radiographic exams and the bone repair process stage in created defect with autogenous bone, blood clot and anorganic bovine bone matrix. Three 8 mm diameter defects were performed in the parietal bone of 6 male adult beagle dogs, choosing the selected graft for each defects; 3 and 6 week period were used for radiographic and histological analyses. The result show that autogenous bone and blood clot were similar between...
Tipo: Journal article
Palavras-chave: Autogenous bone; Biomaterials; Bone graft.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400018

Comparison of Cerebellar Volume Between Subjects with Bilateral Congenital Blindness and Healthy Individuals
Provedor de dados: 77
Autores: Kosif,Rengin; Sahin,Bünyamin; Gürel,Safiye.
Cerebellum regulates motor control and physical coordination. It is known that when eye and hand need to be worked in combination, cerebellum is active and it provides coordination between eye and hand. Cerebellar cortex atrophy appears with dismetry and saccadic eye movement. If there is no stimulant related to vision, how cerebellum is adopted under this circumstance? In order to explore this, 27 male and 16 female volunteers with bilateral congenital blindness were compared with 35 male and 33 female healthy volunteers in this study. MR images of cross-sectional sequential cerebellum of volunteers with 1.5 mm thickness were realized in coronal plane. The surface area of apparent cerebellum seen in cross-sections was calculated by using Onis (Ver. 2.1)...
Tipo: Journal article
Palavras-chave: Bilateral congenital blindness; Cerebellum; Volume.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100039

Comparison of Cerebral Artery Angle in Adults and Fetuses
Provedor de dados: 77
Autores: Fan,Feng; Xiang,Tao; Tsauo,Jiaywei; Xie,Xiaodong; Li,Xiao.
In this study we generated casting specimens of human cerebral blood vessels for twenty-five fetuses and thirty-six adults. The degrees of the angles were measured and comprised for those blood vessels frequently involved in the interventional catheterization.
Tipo: Journal article
Palavras-chave: Cerebral artery angle; Interventional catheterization; Specimens.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300022

COMPARISON OF CHILEAN NATURAL PHOSPHATIC MINERALS
Provedor de dados: 127
Autores: Rojas W,Carlos.
The begining of phosphatic deposits study was dated around 1963 through the survey developed at Bahia Tongoy, and later on at Pachingo in 1989. In this article, a synthesis of the main geological, physico-chemical, and agronomic features of these materials is presented, remarking some of these properties, and agronomical applications obtained after the accomplished research. Location of deposits is described, as well as their origin and phosphorus enrichment. Some solubility results of Chilean rocks is compared with other reactive rocks of USA, and Latinoamerica. Results of classical rock composition, is compared with some Chilean rocks, located at the north region of Chilean territory. Actualized figures of phosphate rock production at Chilean market, is...
Tipo: Journal article
Palavras-chave: Phosphatic ores; Rock reactivity; Andisols; Agronomical use.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000200003

Comparison of commercially-available RNA extraction methods for effective bacterial RNA isolation from milk spiked samples
Provedor de dados: 69
Autores: García-Nogales,Paula; Serrano,Alicia; Secchi,Sonia; Gutiérrez,Serafín; Arís,Anna.
Nucleic-acid based methods for bacterial identification are extremely useful in diagnostic applications due to their specificity and sensitivity. However, they require an optimal purification of the target molecules. As part of the development of a new diagnostic method for the detection of bacterial RNA in cow milk, we have compared four commercially available RNA extraction kits for the isolation of bacterial RNA from spiked UHT milk samples. The kits were compared in terms of extraction efficiency and RNA purity using two bacterial species, the Gram negative Escherichia coli and the Gram positive Staphylococcus aureus. Two kits are based in silica-matrix extraction, and the other two in the guanidinium thiocyanate-phenol-chloroform extraction. In our...
Tipo: Journal article
Palavras-chave: Bacteria; Milk; Purification; RNA.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500019

Comparison of different methods for total RNA extraction from sclerotia of Rhizoctonia solani
Provedor de dados: 69
Autores: Shu,Canwei; Sun,Si; Chen,Jieling; Chen,Jianyi; Zhou,Erxun.
Background Rhizoctonia solani (teleomorph: Thanatephorus cucumeris) is one of the most important pathogens of rice (Oryza sativa L.) that causes severe yield losses in all rice-growing regions. Sclerotia, formed from the aggregation of hyphae, are important structures in the life cycles of R. solani and contain a large quantity of polysaccharides, lipids, proteins and pigments. In order to extract high-quality total RNA from the sclerotia of R. solani, five methods, including E.Z.N.A.&amp;#8482; Fungal RNA Kit, sodium dodecyl sulfate (SDS)-sodium borate, SDS-polyvinylpyrrolidone (PVP), guanidinium thiocyanate (GTC) and modified Trizol, were compared in this study. Results The electrophoresis results showed that it failed to extract total RNA from the...
Tipo: Journal article
Palavras-chave: Polyvinylpyrrolidone; Rhizoctonia solani; RT-PCR; Sclerotia; Sodium dodecyl sulfate; Total RNA extraction.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100009

COMPARISON OF DRY DEPOSITION AND CANOPY EXCHANGE OF BASE CATIONS IN TEMPERATE HARDWOOD FORESTS IN FLANDERS AND CHILE
Provedor de dados: 73
Autores: Staelens,Jeroen; Schrijver,An De; Oyarzún,Carlos; Lust,Noël.
Bulk precipitation, throughfall and stemflow of base cations Na+, K+, Mg2+ and Ca2+ were measured in two deciduous beech forests, located in regions with different air pollution characteristics and strongly differing in soil acidity and soil base saturation. The contribution of dry deposition and canopy leaching to net throughfall flux was estimated using Na+ as a tracer ion. The input of base cations via bulk precipitation was not significantly different between Nothofagus obliqua (Mirb.) Bl. in southern Chile and Fagus sylvatica L. in Flanders. However, net throughfall input of Ca2+ and Mg2+ to the forest floor was significantly higher in Chile than in Flanders. Potassium fluxes were similar in both studied stands. Dry deposition of Ca2+ was higher in...
Tipo: Journal article
Palavras-chave: Atmospheric deposition; Base cations; Fagaceae; Forest canopy; Throughfall.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100003

Comparison of Four Techniques to Estimate Forage Intake by Rams Grazing on a Panicum coloratum L. Pasture
Provedor de dados: 117
Autores: Ferri,Carlos   M; Stritzler,Néstor  P; Brizuela,Miguel  A; Pagella,Horacio   J.
The estimation of daily feed intake is important in the determination of animal production The objective of this experiment was to compare measurements of animal forage intake obtained by the use of four techniques: pre- and post-grazing difference in standing forage mass, total daily feces collection in combination with in vitro diet digestibility, total daily feces collection in combination with diet digestibility estimated by the fecal nitrogen index and the n-alkane technique. The experiment was carried out on a stockpiled Panicum coloratum L. pasture during two growing seasons. The treatments for the first season comprised standing forage mass accumulated after mid-October, mid-January and mid-February mechanical harvest to 8-cm stubble. In the second...
Tipo: Journal article
Palavras-chave: C4 grass; Fecal nitrogen; Forage intake; N-alkanes.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300004

Comparison of Gridded and Measured Rainfall Data for Basin-scale Hydrological Studies
Provedor de dados: 117
Autores: Muñoz,Enrique; Álvarez,César; Billib,Max; Arumí,José Luis; Rivera,Diego.
Global gridded climatological (GGC) datasets, including precipitation and temperature, are becoming more and more precise, accessible, and common, but the utility of these datasets and their limits for hydrological research are still not well determined. In this paper, we compare the performance of two hydrological models that are identical in structure but built with two different inputs: rainfall from rain gauge stations and from a GGC dataset. The objective is to evaluate the utility of gridded datasets in water resource availability studies mainly for hydroelectric and agricultural purposes. The Andean basin of the Laja River, located in south-central Chile, was chosen for this study. It was based on an 18-yr simulation, and it was concluded that i)...
Tipo: Journal article
Palavras-chave: Flow simulation; Monthly water balance; Surface water hydrology; Water resources.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300018

Comparison of haploid and doubled haploid sugar beet clones in their ability to micropropagate and regenerate
Provedor de dados: 69
Autores: Klimek-Chodacka,Magdalena; Baranski,Rafal.
Background: Haploid plant material is considered as recalcitrant to organogenesis, propagation, and maintenance in vitro. However, sugar beet (Beta vulgaris L.) breeders utilizing doubled haploid (DH) technology in their breeding programs indicate that sugar beet haploids may be cultured in vitro as well as diploids. Thus in this paper the in vitro performance of haploid and the doubled haploid sugar beet of various origin was evaluated. The DHs were derived from haploids by diploidization and twelve such haploid and corresponding DH clone pairs were obtained thus the comparison included haploid and DH clones that had identical allelic composition and differed only in their ploidy level. Results: The genotypes differed in shoot morphology and...
Tipo: Journal article
Palavras-chave: Adventitious buds; Axillary shoots; Beta vulgaris; Organogenesis; Ploidy.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000200001

Comparison of methods for determining the color of Chilean honeys and the relationship of color with botanical origin in central Chile
Provedor de dados: 118
Autores: Martin,María José; Fredes,Carolina; Nuñez,Gabriel; Ginocchio,Rosanna; Montenegro,Gloria.
The color of honey has special relevance in the international market, as different markets demand specific colors of honey. Chile has very diverse native and exotic flora, which are used by bees (Apis mellifera) to produce a range of honey types, including honeys of different colors. In this context, determining the relationships between color and botanical origin among Chilean honeys is very relevant. The objectives of the present study were to compare three methodologies for determining color in Chilean honeys (Pantone®, optical density (OD), and Pfund) and to define the relationship between color and botanical origin of the characterized honeys. The most common honeys from the Libertador Bernardo O'Higgins Region (VI Region) of Chile were Galega...
Tipo: Journal article
Palavras-chave: Honey markets; Melissopalynological analysis; Optical density; Pantone®; Pfund.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000300014

Comparison of nutrition composition of transgenic maize (chitinase gene) with its non-transgenic counterpart
Provedor de dados: 118
Autores: Ping-mei,Yan; Yu-kui,Rui; Xiao-yan,Yan; Zheng,Chai; Qing,Wang; Jian-zhong,Du; Yi,Sun.
In order to compare the nutrition components of transgenic maize seeds (chitinase gene), achieved by the pollen-mediated approach, with its non-transgenic counterpart, Vitamin B1, vitamin B2, fatty acids and essential amino acids of transgenic maize seeds and their counterparts were analyzed by the Chinese national standard methods or AOAC methods. The results showed that the contents of all the six kinds of fatty acids detected in transgenic maize seeds were significantly higher than those in their non-transgenic counterpart, the content of vitamin B2 in transgenic maize was significantly lower than that in non-transgenic maize seeds, the content of total amino acids in transgenic maize seed was higher than that in non-transgenic maize seeds, while...
Tipo: Journal article
Palavras-chave: Transgenic maize; Nutrition; Fatty acids; Essential amino acids; Vitamin; Chitinase gene.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100014

Comparison of Phenotypic and Genetic Performance of Local Silkworm Groups and Two Commercial Lines
Provedor de dados: 48
Autores: Mirhosseini,Seyed Ziaeddin; Nematollahian,Shahla; Ghanipoor,Mani; Seidavi,Alireza.
Five Iranian native silkworm groups: Baghdad, Khorasan Orange, Guilan Orange, Khorasan Pink, Khorasan Lemon, and 107 and 110 commercial lines (12 families from each breed) were randomly selected and reared during 2003-2005 (five generations in spring and autumn). In each family, 30 male and 30 female cocoons were individually recorded for weight, shell weight and shell ratio. From among the native groups, the highest average in all three traits belonged to Baghdad and Khorasan Pink, and the lowest to Khorasan Orange and Khorasan Lemon. From among the commercial lines, the highest average in all three traits belonged to 107. In comparing heritabihty for cocoon weight in native groups, the highest heritabihty belonged to Guilan Orange (0.5147) and Khorasan...
Tipo: Journal article
Palavras-chave: Native silkworm; Commercial lines; Bombyx mori L.; Heritabihty; Genetic correlation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000400005

Comparison of Pollen Production and Quality Characteristics of Cultivated and Wild Almond Species
Provedor de dados: 117
Autores: Bayazit,Safder; Califkan,Oguzhan; Imrak,Burhanettin.
There are several wild almond species in Turkey included Amygdalus orientalis (Mill.), Amygdalus turcomanica (Lincz.), Amygdalus fenzliana (Fritsch) Lipsky, Amygdalus trichamygdalus (Hand.-Mazz.) Woronow, Amygdalus arabica (Olivier), and Amygdalus webbii (Spach). These species offer a great value for the almond improvement; we studied the pollen viability, germination ratio and pollen yield for seven genotypes of A. orientalis, seven genotypes of A. turcomanica all growing under natural conditions in Southeastern Anatolia (Gaziantep and §anliurfa provinces, Turkey). Almond cultivars (Prunus dulcis [Mill.] D.A. Webb) obtained from Pozanti Agricultural Experimental Station, Cukurova University, were also used in the experiment. The pollen viabilities of...
Tipo: Journal article
Palavras-chave: Pollen.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400006

Comparison of Proliferative Activity of Epithelial Cells between the Follicles of Impacted Teeth
Provedor de dados: 77
Autores: Kömerik,Nurgül; Tufan,Alper; Kapucuoglu,Nilgün.
The aim of this comparative observational study was to compare the proliferative activity of dental follicles surrounding impacted maxillary canines and mandibular third molars. Following extraction, forty follicles of the impacted mandibular third molars and 40 follicles of the impacted maxillary canines were removed. Epithelial cell proliferative activity of these samples was assessed using immunohistochemical labeling for Ki-67, minichromosome maintenance 2 (MCM-2) protein and epithelial growth factor receptor (EGFR). Intensity and extent of Ki-67, MCM-2 and EGFR expressions were evaluated by a scoring formula. The lining epithelium of the maxillary canine follicles had mean scores of 4.65±0.27 for Ki-67, 1.25±0.33 for MCM-2 and 7.30±0.23 for EGFR which...
Tipo: Journal article
Palavras-chave: Dental follicle; Ki-67; MCM-2; EGFR; Immunohistochemistry.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400028

Comparison of Regression and Neural Networks Models to Estimate Solar Radiation
Provedor de dados: 117
Autores: Bocco,Mónica; Willington,Enrique; Arias,Mónica.
The incident solar radiation on soil is an important variable used in agricultural applications; it is also relevant in hydrology, meteorology and soil physics, among others. To estimate this variable, empirical models have been developed using several parameters and, recently, prognostic and prediction models based on artificial intelligence techniques such as neural networks. The aim of this work was to develop linear models and neural networks, multilayer perceptron, to estimate daily global solar radiation and compare their efficiency in its application to a region of the Province of Salta, Argentina. Relative sunshine duration, maximum and minimum temperature, rainfall, binary rainfall and extraterrestrial solar radiation data for the period...
Tipo: Journal article
Palavras-chave: Modeling; Prediction; Linear regression; Multilayer perceptron.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300010

Comparison of relative abundance and diversity of coccinellids (Coleoptera: Coccinellidae) in blueberries (Vaccinium corymbosum L.), under two production systems in the La Araucanía Region, Chile
Provedor de dados: 118
Autores: Vera,Marcela; Aguilera,Alfonso; Rebolledo,Ramón.
Coccinellids have been used, throughout the world, in biological control programs of agriculture pests. In Chile this family has been studied by various authors, which addresses issues such as biology, predatory activity and distribution in herbaceous species, shrubs and trees, but their situation in blueberries, where there is an abundance of species, is unknown Coccinellid beetles were counted visually on two blueberry orchards, under organic and conventional management. This study was conducted at the Maquehue Experiment Station, in the central valley of "La Araucanía Región" in southern Chile, from September 2007 through May 2008 and was divided into two periods: from September 2007 through February 2008 with visual counts only on the foliage of the...
Tipo: Journal article
Palavras-chave: Blueberries; Coccinellids; Eriopis connexa; Eriopis eschscholtzii; Hyperaspis sphaeridioides.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200012

Comparison of Root Induction in Mature Filbert (Corylus avellana L.) Explants by Agrobacterium Rhizogenes and Indolbutiric Acid
Provedor de dados: 117
Autores: Sánchez-Olate,Manuel; Sáez,Patricia; Cartes,Priscila; Alvarez,Carolina; Ríos,Darcy.
From in vitro cultured adult material of Corylus avellana L. cv. Negretta, adventitious rooting of microshoots was evaluated. Rhizogenic induction mediated by two strains of wild-type Agrobacterium rhizogenes (A477 and A478) and indolbutyric acid (IBA) were compared under two light conditions (16:8 h photoperiod and complete darkness). The results indicate that in the 16:8 h photoperiod induction, the rooting rate with IBA (90%) was significantly higher than that obtained with the strain A477 of A. rhizogenes (67.7%), while with the strain A478 no statistically significant difference was obtained for the same variable (75%). On the other hand, under complete darkness, rooting mediated by IBA (90%) significantly surpassed the results obtained with both...
Tipo: Journal article
Palavras-chave: Rooting; European hazelnut.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100013

Comparison of shape analysis methods for Guinardia citricarpa ascospore characterization
Provedor de dados: 69
Autores: Pazoti,Mário Augusto; Garcia,Rogério Eduardo; Cruz Pessoa,José Dalton; Martinez Bruno,Odemir.
Among the diseases affecting the commercial citrus production, the citrus black spot (CBS) is considered to cause substantial losses. The analyses of particles in suspension in the orchards and collected into a disc have been applied as a preventive action trying to identify the presence of fungus spores before symptom appearance. In this paper, we show the results of several shape analysis methods applied to the fungus, the first step to the aimed computer aided vision system, capable to assist the identification process. Experiments and comparative results among the methods are presented in this paper, showing that better results were obtained applying the curvature method
Tipo: Journal article
Palavras-chave: Computer vision; Curvature; Pattern recognition; Shape analysis; Shape signature and projection.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300006

Comparison of the Allometry Coefficient of the Length-Weight and Length-Length Relationship between Selene brownii, S. vomer and S. setapinnis Caught in the Gulf of Mexico
Provedor de dados: 77
Autores: Farías-Tafolla,B; De la Cruz-Torres,J; Ponce-Rodríguez,A; Gersenowies-Rodríguez,J. R; Martínez-Pérez,J. A; Chávez-Arteaga,M. M.
This work presents a comparison of the length-weight and length-length allometric relationships between six measurements: length pattern (LP), cephalic length (CL), maximum depth (MA), caudal peduncle depth (CPD) ocular diameter (OD) and weight (W) of three species of the genus Selene (S. brownii, S. vomer and S. setapinnis) caught in the port of Veracruz, Mexico, using a beach seine of 800 m. The results show certain relationships between all measurements of S. brownii (an isometric relationship and four negative allometric relationships); S. vomer showed only four relationships (two isometric and two negative allometric); and S. setapinnis showed three relationships (all negative allometric); the results of S. vomer and S. setapinnis are consistent with...
Tipo: Journal article
Palavras-chave: Selene; Allometric analysis; Length-weight and length-length relationships; Coefficient of allometry.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400007

Comparison of the chemical composition and anti-methanogenic potential of Liquidambar orientalis leaves with Laurus nobilis and Eucalyptus globulus leaves using an in vitro gas production technique
Provedor de dados: 118
Autores: Ulger,Ismail; Kamalak,Adem; Kurt,Ozer; Kaya,Emrah; Guven,Inan.
The aim of the present study was to compare the leaves of Liquidambar orientalis with the leaves of Laurus nobilis and Eucalyptus globulus in terms of their chemical composition and anti-methanogenic potential using an in vitro gas production technique. Species had a significant effect on the chemical composition, gas production, methane production, metabolizable energy and organic matter digestibility of the tree leaves. The crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and condensed tannin (CT) contents of the tree leaves ranged from 9.11 to 12.8, 22.49 to 35.85, 32.76 to 49.31, and 1.55 to 9.29%, respectively. The gas production, methane production, metabolizable energy (ME) and organic matter digestibility (OMD) ranged...
Tipo: Journal article
Palavras-chave: Anti-methanogenic potential; Chemical composition; Digestibility; L. orientalis leaves; Metabolizable energy.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100008

Comparison of the Cranial Capacity and Brain Weight of Arak (Central Iran) with other Subgroups of Iranian Population
Provedor de dados: 77
Autores: Bayat,Parvin Dokht; Ghanbari,Ali.
Newborn's body dimensions such as brain weight and cranial capacity can be basis for all changes in anthropometric indices and later problems. This study is undertaken on 978 term-born normal and native newborns in Thaleghany Hospital, Arak, Iran. The measurements of the heads were done according classic cephalometry. The cranial capacity and brain weight of males and female statistically evaluated by using c²- and t test and significance was set up at p&lt;0.05. Means and SD of the cranial capacity were 606.2± 26 and 440.82 ± 28 for males and females. Means and SD of the brain weight were 627.41±30 for males and 456.24±32 for females. The data showed that cranial capacity and brain weight of males were greater for males than that for females. This data in...
Tipo: Journal article
Palavras-chave: Cranial capacity; Brain weight; Ethnicity; Hrdlicka's method; New born.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100047

Comparison of the Efficacy of Honey and Animal Oil in Accelerating Healing of Full Thickness Wound of mice skin
Provedor de dados: 77
Autores: Ghaderi,Reza; Afshar,Mohammad; Akhbarie,Hadi; Golalipour,Mohammad Jafar.
There are some medications and procedures that can be used to accelerate the healing of skin wounds. Some studies have demonstrated improvement of burn wound healing with honey treatment. In other hand, based on traditional medicine have improved wound healing with animal oil. This study was done to compare the efficacy of animal oil and honey in accelerating healing of full thickness wound of skin in mice. In this experimental study 36 male NMRI mice were subjected to full-thickness skin wounds under general anesthesia. Animals were randomly allocated to receive either single daily applications of placebo, animal oil and honey (n=12 for each group) respectively. On 4th, 7th and 10th days, four mice from each group were sacrificed using an overdose of...
Tipo: Journal article
Palavras-chave: Honey; Animal oil; Wound healing; Skin; Mice.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100027

Comparison of the Oxygen Diffusing Capacity of the Picui Ground Dove (Columbina picui) with Other Doves of Chile
Provedor de dados: 77
Autores: Alfaro,; Figueroa Perez,Daniela; Sabat K,Pablo; Sallaberry,Michel; Canals L,Mauricio.
We studied the respiratory surface density and the thickness of the air-blood barrier in the Picui Ground Dove (Columbina picui), and compared it with Eared Dove (Zenaida auriculata) and Blacked-winged Ground Dove (Metropelia melanoptera), two larger species. As expected, Columbina picui BMR and VO2max showed higher values than those of the larger species according to the expected for their body size. The respiratory surface density and the thickness of the blood-air barrier were not different among the different species of doves. However C. picui showed an anatomical diffusion factor lower than M. melanoptera and Z. auriculata. Picui Ground Dove had low values of oxygen diffusion capacity, such as cursorial birds. A differential oxygen partial pressure of...
Tipo: Journal article
Palavras-chave: Picui ground gove; Columbina picui; Metropelia melanoptera; Zenaida auriculata; Oxygen diffusing.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100018

Comparison of the total phenolic content, total anthocyanin content and antioxidant activity of polyphenol-rich fruits grown in Chile
Provedor de dados: 118
Autores: Fredes,Carolina; Montenegro,Gloria; Zoffoli,Juan Pablo; Santander,Francisca; Robert,Paz.
In the last 10 years, interest in research on polyphenol-rich fruit species has increased due to the potential health benefits of these species, mainly attributed to their high anthocyanin content and antioxidant activity. Six polyphenol-rich fruit species (blueberries, raspberries, blackberries, strawberries, pomegranates and maqui berries) were harvested at the same maturity stage during the same growing season and were compared according to their total phenolic (Folin-Ciocalteu method) and total anthocyanin (pH differential method) contents and antioxidant activity using ferric-reducing antioxidant power (FRAP assay) and 2,2-diphenylpicrylhydrazyl (DPPH) radical scavenging capacity methods. With the results of this study, the polyphenolic status of the...
Tipo: Journal article
Palavras-chave: Berries; DPPH; FRAP; Maqui; Pomegranate.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100005

Comparison of Two Different Methods of Average Working Length Determination in Second Molars and Premolars
Provedor de dados: 77
Autores: Rodríguez-Niklitschek,Cynthia; Cantín,Mario; Oporto,V. G. H.
Within the procedures involved in a successful endodontic treatment is the working length (WL) determination. The root canal end must be detected accurately, and a precise control of the WL must be maintained. There are several methods to determine WL. Researchers have published the average teeth length (ATL) to the human permanent dentition. These measurements are used as an anatomical reference. If the WL is evaluated using a radiographic image, it is accepted as clinical success if the limit of the canal sealing is 1 mm coronal to the root apex. One method to determine WL is based in substract 1 mm to ATL. Another method widely used, assert to achieve a more precise WL determination, through the use of an electronic apex locator (AL). Nevertheless,...
Tipo: Journal article
Palavras-chave: Endodontics; Electronic apex locator; Working length; Root canal system anatomy.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300052

Comparison of two total RNA extraction protocols using the marine gorgonian coral Pseudopterogorgia elisabethae and its symbiont Symbiodinium sp.
Provedor de dados: 69
Autores: Santiago-Vázquez,Lory Z.; Ranzer,Llanie K.; Kerr,Russell G.
Marine invertebrates such as soft corals are important sources of secondary metabolites with promising biomedical applications and commercial value. RNA isolation in conjunction with reverse-transcriptase polymerase chain reaction (RT-PCR) are valuable tools utilized to study the molecular elements involved in secondary metabolite production and functional genomics. Two total RNA extraction protocols were compared using fresh tissue and flash frozen preparations from the coral Pseudopterogorgia elisabethae and from its symbiont Symbiodinium sp. isolated using RNeasy minicolumns (&lt;a href="http://www1.qiagen.com/SelectCountry.aspx"&gt;Qiagen®&lt;/a&gt;) and Trizol reagent (&lt;a href="http://www.invitrogen.com/"&gt;Invitrogen®&lt;/a&gt;). In general,...
Tipo: Journal article
Palavras-chave: Dinoflagellate; RNA isolation; RNeasy minicolumns; Trizol reagent.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500017

Comparison of whole-genome amplifications for microsatellite genotyping of Rotylenchulus reniformis
Provedor de dados: 69
Autores: Arias,Renée S; Stetina,Salliana R; Scheffler,Brian E.
Currently, a large number of microsatellites are available for Rotylenchulus reniformis (reniform nematode); however, two barriers exist for genotyping samples from different geographical areas. The limited amount of nucleic acids obtained from single nematodes which would require their multiplication to obtain enough DNA for testing; and the strictly regulated transport of live samples and multiplication in greenhouse for being a plant pathogen. Whole-genome amplification (WGA) of samples consisting of one and five dead gravid females with their associated egg masses was successfully performed on disrupted tissue using three commercial kits. DNA yield after WGA ranged from 0.5 to 8 Âµg and was used to test 96 microsatellite markers we previously developed...
Tipo: Journal article
Palavras-chave: Genotyping; Reniform nematode; SSR; STR; WGA.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300014

Comparison on the removal of hydrogen sulfide in biotrickling filters inoculated with Thiobacillus thioparus and Acidithiobacillus thiooxidans
Provedor de dados: 69
Autores: Aroca,Germán; Urrutia,Homero; Núñez,Dariela; Oyarzún,Patricio; Arancibia,Alejandra; Guerrero,Karlo.
Emissions of hydrogen sulfide (H2S) by industrial activities is frequent cause of corrosion and unpleasant odours. Treatment of gaseous emissions contaminated with H2S by biotrickling filters inoculated with single cultures of sulfur oxidizer bacteria exhibit several advantages over physicochemical methods, such as shorter adaptation times and higher removal ability. Biofilms of Thiobacillus thioparus and Acidithiobacillus thiooxidans have proved to exhibit high removal capacities, yet no comparative studies between them have been reported. This article reports the efficiency of biotrickling filters inoculated with T. thioparus and A. thiooxidans under similar conditions excepting the pH, that was the optimal for the bacterial growth, for the removal of...
Tipo: Journal article
Palavras-chave: Acidithiobacillus thiooxidans; Biofilm; Biofiltration; Hydrogen sulfide; Thiobacillus thioparus.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400005

Comparisons in Soft-Tissue Thicknesses on the Human Face in Fresh and Embalmed Corpses Using Needle Puncture Method
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Cantín López,Mario; Zavando Matamala,Daniela Alejandra; Perez Rojas,Francisco Javier; Torres Muñoz,Sebastián René.
The aim of the present study is to analyze the differences in the soft facial tissue thicknesses measured in corpses without fixing, with recent death, and in embalmed corpses. 30 male human corpses were used; they were divided into two groups according to the presence or absence of a conservation method. Fifteen bodies, without any method of conservation, with an average age of 38.6 years (SD 8.37) and Fifteen preserved bodies by means of the intravascular injection technique of fixing conservative solution on the basis of formaldehyde, with an average age of 38.4 years (SD 7.67). In each one of them the thickness was measured in eight medium and six bilateral paramedium landmarks, using the needle-punction method. The descriptive statistical ones were...
Tipo: Journal article
Palavras-chave: Facial reconstruction; Soft-tissue thickness; Identification; Embalming; Cadavers.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100027

COMPENSACIÓN: UN NUEVO CONCEPTO RELACIONADO CON LA LATERALIDAD CEREBRAL. SU APLICACIÓN A REGIONES DEL LÓBULO FRONTAL, INCLUIDA EL ÁREA MOTORA DEL LENGUAJE (DE BROCA)
Provedor de dados: 77
Autores: Merlo,Alicia; Albanese,Eduardo; Gómez,Elena; Miño,Jorge; Ingratta,Adriana; Mascitti,Tomás; Albanese,Alfonso M.
: Cuando se determina la asimetría de una estructura bilateral formada por subregiones asimétricas con lateralidades opuestas, queda enmascarada (compensada), total o parcialmente, la existencia de las diferencias interhemisféricas de tales subregiones. Para cuantificar esta realidad, hemos establecido un nuevo parámetro: la compensación. El objetivo del presente trabajo, realizado en cerebros humanos postmortem, está dirigido a determinar los porcentajes de compensación, de asimetría de peso y de superficie cortical, de tres regiones cerebrales pertenecientes al lóbulo frontal: 1. El área de motora del lenguaje (de Broca). 2. La porción anterior del giro frontal inferior. 3. El giro frontal inferior en su totalidad. Para valores de peso y de superficie...
Tipo: Journal article
Palavras-chave: Área de Broca; Giro frontal inferior; Compensación; Asimetría cerebral.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000200003

Compensatory responses induced by oxidative stress in Alzheimer disease
Provedor de dados: 48
Autores: MOREIRA,PAULA I; ZHU,XIONGWEI; LIU,QUAN; HONDA,KAZUHIRO; SIEDLAK,SANDRA L; HARRIS,PEGGY L; SMITH,MARK A.; PERRY,GEORGE.
Oxidative stress occurs early in the progression of Alzheimer disease, significantly before the development of the pathologic hallmarks, neurofibrillary tangles and senile plaques. In the first stage of development of the disease, amyloid-&amp;#946; deposition and hyperphosphorylated tau function as compensatory responses and downstream adaptations to ensure that neuronal cells do not succumb to oxidative damage. These findings suggest that Alzheimer disease is associated with a novel balance in oxidant homeostasis.
Tipo: Journal article
Palavras-chave: Alzheimer disease; Antioxidant therapy; Mitochondria; Oxidative stress; Redox metals.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100002

Competencia en Cladocera: implicancias de la sobreposición en el uso de los recursos tróficos
Provedor de dados: 97
Autores: MARTINEZ,GINGER; MONTECINO,VIVIAN.
A pesar que numerosa evidencia demuestra el uso de diferentes estrategias de alimentación entre cladóceros, la clásica descripción de una conducta alimentaria pasiva ha conducido a una subestimación de la sobreposición de nicho trófico sobre sus patrones de coexistencia. En condiciones de microcosmos, se mantuvieron experimentos pareados de dinámica poblacional de los cladóceros Moina micrura (Moinidae) y Ceriodaphnia dubia (Daphnidae), especializados en los recursos Chlorella sp. y Oocystis sp. (Chlorococcales) respectivamente y del generalista Daphnia ambigua (Daphnidae), durante 35 - 45 días. Mientras que los especialistas M. micrura y C. dubia no dieron evidencias de competencia, la presencia de cada uno produjo un significativo decrecimiento de la...
Tipo: Journal article
Palavras-chave: Competencia interespecífica; Estrategias alimentarias; Nicho trófico; Cladóceros.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400020

Competencias Generales en Medicina, Rol de la Anatomía
Provedor de dados: 77
Autores: Inzunza H,Oscar.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200001

Competition with spreading dayflower (Commelina diffusa L.) can affect the agronomic characteristics and mineral content of common bean grains
Provedor de dados: 118
Autores: Gomes,Lidiane dos Santos; Pin Dalvi,Leandro; Colodete Altoé,Sabrina; Rocha,Leonardo José Frinhani Noia da; Oliveira,Fabio Luiz de.
Abstract The objective of this study was to evaluate the effects of the presence of Commelina diffusa weeds on the agronomic characteristics and mineral content of bean grains (Phaseolus vulgaris L.). The experiments were conducted using a completely randomized design with five replications in a greenhouse. The treatments consisted of two bean cultivars (BRS Ametista and BRS Estilo) grown in the presence and absence of the weeds. The weeds affected the agronomic and mineral characteristics of the varieties; caused a decrease in the number of leaves; reduced the chlorophyll content in the leaves; and reduced the nitrogen, phosphorus and iron contents in the grains. Competition with spreading dayflower did not cause significant effects on the stem diameter...
Tipo: Journal article
Palavras-chave: Food security; Mineral characteristics; Phaseolus vulgaris L; Weeds.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000200121

COMPETITIVE EFFECTS OF THE ALIEN INVASIVE CENTAUREA SOLSTITIALISL. ON TWO CHILEAN BACCHARIS SPECIES AT DIFFERENT LIFE-CYCLE STAGES
Provedor de dados: 73
Autores: Gómez-González,Susana; Cavieres,Lohengrin A; Torres,Patricio; Torres-Díaz,Cristian.
Several studies have revealed a variety of mechanisms of invasion of alien plant species. However, little is known on how those mechanisms and their associated effects on native species change across different life-cycle stages. Under controlled conditions, we assessed the interactions between the alien invasive species Centaurea solstitialis L. (Asteraceae) and two pioneer native species to the Chilean matorral; Baccharis linearis (Ruiz et Pav.) Pers. and B. paniculata DC. (Asteraceae). Competitive effects of the invader on natives were evaluated by combining different life-cycle stages: seed-seed, plant-seed, and plant-plant. Seed germination of C. solstitialis was explosive and much faster than that of the native species. The presence of C. solstitialis...
Tipo: Journal article
Palavras-chave: Allelopathy; Matorral; Mediterranean; Seed germination; Yellow starthistle.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100007

Compilation of an informative microsatellite set for genetic characterisation of East African finger millet (Eleusine coracana)
Provedor de dados: 69
Autores: De Villiers,Santie M; Michael,Vincent N; Manyasa,Eric O; Saiyiorri,Annis N; Deshpande,Santosh.
Background Genetic diversity of finger millet (Eleusine coracana), a nutritious neglected staple cereal in Africa and South Asia is largely uncharacterized. This study analysed 82 published SSR markers for finger millet across 10 diverse accessions to compile an informative set for genetic characterisation. Extensive optimization compared single samples with bulked leaf or bulked DNA samples for capturing within accession genetic diversity. The markers were evaluated to determine (1) how efficiently they amplified target loci during high-throughput genotyping with a generic PCR protocol, (2) ease of scoring PCR products and (3) polymorphism and ability to discern genetic diversity within the tested finger millet germplasm. Results Across 88 samples, the 52...
Tipo: Journal article
Palavras-chave: Diversity analysis; SSR markers; Genotyping.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200003

Complement dependent cytotoxicity activity of therapeutic antibody fragments is acquired by immunogenic glycan coupling
Provedor de dados: 69
Autores: Courtois,Anthony; Gac-Breton,Stéphanie; Berthou,Christian; Guézennec,Jean; Bordron,Anne; Boisset,Claire.
Oligosaccharides are implicated in the development of the immune response notably in complement activation. Anti-tumoural immunotherapy by monoclonal antibodies (mAbs) offers some advantages to chemotherapy including cell targeting but some of them are inefficient to generate cytotoxicity dependent complement (CDC) known to be important in the antibody&amp;#146;s efficacy. The aim of this study is to give a CDC activity of mAb by linkage of a complement activating oligosaccharide to this antibody via a hetero-bifunctional linker allowing control of the conjugation reaction. We worked on non Hodgkin Burkitt&amp;#146;s lymphoma as cancer source, Fab fragments of rituximab devoid of complement activity as mAb and the trisaccharide...
Tipo: Journal article
Palavras-chave: Complement system Gala(1&amp;rarr; 3)Gal epitope immunogenic oligosaccharide immunotherapy non-Hodgkin lymphoma xenoantigen.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500005

Complete Ossification of the Superior Transverse Scapular Ligament in a Nigerian Male Adult
Provedor de dados: 77
Autores: Osuagwu,F. C.; Imosemi,I. O.; Shokunbi,M. T.
Complete ossification of the superior transverse scapular ligament is generally considered to be rare and has not been previously described in a Nigerian. In the diagnosis of suprascapular nerve entrapment syndrome, variations in the anatomy of the superior transverse scapular ligament must be considered as possible etiologic factors, as illustrated by this case report
Tipo: Journal article
Palavras-chave: Superior transverse scapular ligament; Ossification; Entrapment neuropathy.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200004

Complete Ossification of the Superior Transverse Scapular Ligament in an Indian Male Adult
Provedor de dados: 77
Autores: Khan,Mohd. Azim.
Complete ossification of the superior transverse scapular ligament is generally considered to be rare and has not been previously described in an Indian. In the diagnosis of suprascapular nerve entrapment syndrome, variations in the anatomy of the superior transverse scapular ligament must be considered as possible etiologic factor, as illustrated by this case report
Tipo: Journal article
Palavras-chave: Suprascapular ligament; Ossification; Entrapment syndrome.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300013

Complete Ossification of the Superior Transverse Scapular Ligament in an Turkish Male Adult
Provedor de dados: 77
Autores: Büyükmumcu,M; Seker,M; Ozbek,O; Akin,D; Koc,O; Aydin,A. D; Salbacak,A.
Scapula has three margins and angles and located posterolateral of thorax. One of the anatomical structures of scapula is suprascapular notch located medial to coracoid process base. Suprascapular notch can be seen in different shapes and depths. Suprascapular notch is surrounded by transverse scapular ligament which is a short and strong ligament. Suprascapular notch creates an osteofibrosis passage with this structure within suprascapular nerve passes. It has been reported that this osteofibrosis structure can intirely or partially ossify. All lesions of nerves occured in course as result of exposure to compression, tension and bending are called entrapment neuropathy. Like other peripheral nerves, suprascapular nerve can be exposed to compression while...
Tipo: Journal article
Palavras-chave: Suprascapular notch; Multidetector Computed Tomography; Variations.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200038

Complete sequence of the genome of the human isolate of Andes virus CHI-7913: comparative sequence and protein structure analysis
Provedor de dados: 48
Autores: TISCHLER,NICOLE D; FERNÁNDEZ,JORGE; MÜLLER,ILSE; MARTÍNEZ,RODRIGO; GALENO,HÉCTOR; VILLAGRA,ELIECER; MORA,JUDITH; RAMÍREZ,EUGENIO; ROSEMBLATT,MARIO; VALENZUELA,PABLO D.T.
We report here the complete genomic sequence of the Chilean human isolate of Andes virus CHI-7913. The S, M, and L genome segment sequences of this isolate are 1,802, 3,641 and 6,466 bases in length, with an overall GC content of 38.7%. These genome segments code for a nucleocapsid protein of 428 amino acids, a glycoprotein precursor protein of 1,138 amino acids and a RNA-dependent RNA polymerase of 2,152 amino acids. In addition, the genome also has other ORFs coding for putative proteins of 34 to 103 amino acids. The encoded proteins have greater than 98% overall similarity with the proteins of Andes virus isolates AH-1 and Chile R123. Among other sequenced Hantavirus, CHI-7913 is more closely related to Sin Nombre virus, with an overall protein...
Tipo: Journal article
Palavras-chave: Hantavirus; Genome sequence; RNA polymerase; Human isolate.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000200010

Complex bioclimatic and soil gradients shape leaf trait variation in Embothrium coccineum (Proteaceae) among austral forests in Patagonia
Provedor de dados: 97
Autores: SOUTO,CINTIA P; PREMOLI,ANDREA C; REICH,PETER B.
Patterns of trait variation may be adaptive when vary in relation to an environmental gradient. In particular, leaf traits can affect productivity and competitive ability. We identify patterns of leaf size and shape variation with environmental heterogeneity in one of the most widespread tree species within temperate South America: Embothrium coccineum (Proteaceae). We collected leaf specimens and composite soil samples from 35 populations between 38° and 55° S latitude in Patagonia, covering a wide range of mean annual precipitation (MAP) and mean annual temperature (MAT). At each location, we measured nine morphological traits, some of which were cross correlated hence we focus on a smaller number of representative traits. We hypothesized that leaf area...
Tipo: Journal article
Palavras-chave: Leaf shape; Complex gradients; Leaf area; Dry mass; SLA.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000200004

Complex, multifocal, individual-specific attention-related cortical functional circuits
Provedor de dados: 48
Autores: BASILE,LUIS F. H.
Recent studies focusing on the analysis of individual patterns of non-sensory-motor CNS activity may significantly alter our view of CNS functional mapping. We have recently provided evidence for highly variable attention-related Slow Potential (SP) generating cortical areas across individuals (Basile et al., 2003, 2006). In this work, we present new evidence, searching for other physiological indexes of attention by a new use of a well established method, for individual-specific sets of cortical areas active during expecting attention. We applied latency corrected peak averaging to oscillatory bursts, from 124-channel EEG recordings, and modeled their generators by current density reconstruction. We first computed event-related total power, and averaging...
Tipo: Journal article
Palavras-chave: Attention; Cortical electrical activity; High-resolution electroencephalography; Slow potentials; Source localization; Functional mapping.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000500007

COMPORTAMIENTO AGRONOMICO Y DE CALIDAD DE VARIEDADES DE TRIGO CHILENAS SEMBRADAS EN EL NOROESTE DEL PACÍFICO, ESTADOS UNIDOS.
Provedor de dados: 113
Autores: Jobet,Claudio; Kronstad,Warren.
Cinco cultivares de trigo de pan fueron seleccionados en el presente estudio, los cuales representaban diferentes fuentes de variación genética, los cuales se diferenciaron por hábito de crecimiento, características agronómicas y de calidad. El objetivo del trabajo fue evaluar el comportamiento de diferentes fuentes de germoplasma cuando son sembrados en condiciones ambientales similares. Trigos provenientes de Estados Unidos (Kansas y Oregon) y de Chile fueron evaluados bajo la condición ambiental del noroeste del Pacífico en los Estados Unidos (Corvallis, Oregon, 44° 30´N, 123° 30´W). Los resultados mostraron diferencias significativas para fecha de espigadura, altura de planta, peso de grano y rendimiento en grano. No se observaron diferencias para...
Tipo: Journal article
Palavras-chave: Parámetros agronómicos; Calidad molinera y panadera; Rendimiento en grano.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000300009

COMPORTAMIENTO DE ALGUNOS CÍTRICOS SOBRE DIFERENTES PORTAINJERTOS, EN SU TERCERA TEMPORADA DE CRECIMIENTO, QUILLÓN VIII REGIÓN, CHILE
Provedor de dados: 113
Autores: Joublan,Jean Paul; Cordero,Nelson.
Se evaluó la producción y calidad de frutos de un cultivar de mandarino (Citrus reticulata Blanco), tres de naranjo (Citrus sinensis L. Osbeck) y dos de limonero (Citrus limon L. Burmann) sobre diferentes portainjertos en una zona fría, Quillón, Chile, en su tercera temporada de crecimiento. Hubo una moderada influencia de los portainjertos sobre la calidad de fruto, pero no en producción. Así Troyer indujo una menor calidad en mandarino Clementina que Carrizo y Citrumelo, sin embargo, no fue significativo debido a la escasa producción por árbol en esta temporada. En naranjos Newhall, el patrón Rubidoux provocó una mayor producción que Troyer y Carrizo, este último indujo un mayor contenido de sólidos solubles. Salustiana sobre Carrizo alcanzó un mayor...
Tipo: Journal article
Palavras-chave: Mandarina; Naranja; Limón; Patrón.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000300012

COMPORTAMIENTO DE ISOLÍNEAS DE ALTURA EN RELACIÓN CON EL RENDIMIENTO Y DISTRIBUCIÓN DE ASIMILADOS EN TRIGO
Provedor de dados: 113
Autores: Zapata T.,Cristian; Silva C.,Paola; Acevedo H.,Edmundo.
El uso de variedades de trigo con genes enanizantes ha permitido lograr grandes incrementos en la producción. Sin embargo, aún esta poco claro cómo estos genes afectan el rendimiento y la fisiología de trigo. Los objetivos de este trabajo fueron evaluar el efecto de la altura de planta sobre el rendimiento, la estabilidad del rendimiento y la distribución de los asimilados a los distintos componentes del rendimiento. Se utilizó el trigo harinero cultivar Santa Helena y once líneas cercanas a isogénicas derivadas de este cultivar y portadoras de los genes enanizantes Rht1 y/o Rht2. El ensayo se evaluó durante tres temporadas, dos en México y una Chile. Las isolíneas semienanas rindieron 21% más que los otros grupos en todos los medioambientes, mientras que...
Tipo: Journal article
Palavras-chave: Genes Rht; Genes de enanismo; Rendimiento potencial; Trigo; Triticum aestivum L.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000200003

COMPORTAMIENTO DE VACAS LECHERAS EN PASTOREO CON Y SIN SUPLEMENTACIÓN CON CONCENTRADO
Provedor de dados: 113
Autores: Balocchi L.,Oscar; Pulido F.,Rubén; Fernández V.,Javier.
Se estudió el efecto de la suplementación con concentrado sobre el comportamiento del pastoreo de vacas en lactancia. El trabajo se realizó en la Estación Experimental Vista Alegre (39º48’ lat. Sur y 73º13’ long. Oeste) perteneciente a la Universidad Austral de Chile. Se utilizaron 12 vacas de la raza Frisón Negro que pastorearon praderas polifíticas permanentes bajo un sistema de pastoreo rotacional en franjas. Se utilizó un diseño de cuadrado latino con tres períodos (23 días cada uno), tres tratamientos y cuatro cuadrados. Los tres tratamientos por período fueron T1: sólo pastoreo sin suplementación; T2: pastoreo más un concentrado en base a pulpa seca de remolacha (6 kg vaca-1 d-1); y T3: pastoreo más un concentrado en base a granos (6 kg vaca-1 d-1)....
Tipo: Journal article
Palavras-chave: Comportamiento ingestivo; Pradera; Producción de leche.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100009

COMPORTAMIENTO ECONÓMICO Y PRODUCTIVO DE SISTEMAS CAMPESINOS EN CONDICIÓN DE EXCEDENTARIEDAD Y SUBSISTENCIA.: ESTUDIO DE CASO
Provedor de dados: 113
Autores: de la Barra A.,Rodrigo; Holmberg F,Germán.
Este trabajo estudia las relaciones de los sistemas de producción campesinos. El estudio se realizó en la comuna de Maullín, Décima Región de Chile, entre 1995 y 1997, donde se analizaron dos casos de sistemas campesinos, uno excedentario y otro de subsistencia. Los resultados indican que el tipo subsistencia genera sus ingresos en efectivo con una mayor diversidad de rubros que el tipo excedentario. En el tipo subsistencia la estrategia productiva se basa en el uso de autoinsumos y una baja contratación de mano de obra y servicios, minimizando el desembolso en efectivo. El tipo excedentario basa su estrategia productiva en un alto gasto en mano de obra y servicios, y una alta proporción de la producción dirigida hacia la venta. Además, el qué, cómo y...
Tipo: Journal article
Palavras-chave: Economía campesina; Campesinado.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000100005

COMPORTAMIENTO EN POSTCOSECHA DE FRUTOS DE UN HIBRIDO DE CIRUELO Y DAMASCO (PLUOT) VAR. FLAVORICH Y EFECTOS DE ATMOSFERA MODIFICADA
Provedor de dados: 113
Autores: Retamales A.,Julio; Defilippi B.,Bruno.
Se evaluó el comportamiento en postcosecha de frutos de "pluots" variedad Flavorich. La fruta fue almacenada por 30 y 40 días en frío, incluyendo tratamientos en atmósfera modificada (AM) que permitieron alcanzar distintos niveles de gases. Adicionalmente la fruta fue evaluada después de mantenerla a 20°C, midiéndose firmeza de la pulpa, sólidos solubles, acidez total titulable, color de la pulpa y deshidratación. No se observaron beneficios de los tratamientos de atmósfera modificada, exceptuando reducción de la deshidratación de la fruta. La fruta pudo ser almacenada por 40 días en frío sin manifestaciones aparentes de senescencia, manteniéndose con adecuada firmeza y altos niveles de sólidos solubles. Adicionalmente, la acidez de la fruta es baja y no...
Tipo: Journal article
Palavras-chave: Fruta de carozo; "plumcot"; Firmeza; Sólidos solubles; Acidez.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000200006

Comportamiento social y reproductivo del roedor subterráneo solitario Ctenomys talarum (Rodentia: Ctenomyidae) en condiciones de semicautiverio
Provedor de dados: 97
Autores: ZENUTO,ROXANA R.; VASSALLO,ALDO I.; BUSCH,CRISTINA.
Se estudió el comportamiento social y reproductivo en grupos de individuos del roedor subterráneo Ctenomys talarum (Thomas, 1898) en condiciones seminaturales, que reflejaron la complejidad de las cuevas de la especie así como también la relación de sexos típica de poblaciones naturales. Los datos sugieren que las interacciones entre los individuos son mucho más variadas y complejas que lo esperado para una especie solitaria y territorial. Diferentes canales de comunicación _auditivo, táctil y olfativo- fueron importantes para el establecimiento y mantenimiento de territorios y durante el cortejo y la cópula. Se observaron diferencias en el comportamiento social entre individuos de poblaciones naturales con diferentes características ecológicas. Individuos...
Tipo: Journal article
Palavras-chave: Comportamiento social; Reproducción; Roedores subterráneos; Cautiverio; Ctenomys talarum.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100016

COMPORTAMIENTO TÉRMICO DEL SUELO BAJO CUBIERTAS PLÁSTICAS.: I. EFECTO DE DIFERENTES TIPOS DE LÁMINAS
Provedor de dados: 113
Autores: Misle A.,Enrique; Norero Sch.,Aldo.
Durante noviembre de 1996 se realizó un experimento en la Universidad Católica del Maule, Talca (35º26’ lat. Sur, 71º26’ long. Oeste), en un suelo Haplanthrepts, para determinar la conducta térmica del suelo bajo cuatro cubiertas plásticas diferentes a 7 cm de profundidad: polietileno transparente (TRA), film blanco/negro (OPA), film AL-OR, café (CAF) y polietileno naranja (NAR). Se seleccionaron las láminas TRA y OPA por ser opuestas en transmisividad, NAR y CAF, como alternativas de acolchados (mulch) ofrecidas en el mercado. TRA alcanzó la temperatura más alta (máxima promedio = 39,1°C), acumulando más calor que CAF y produciendo ambos tratamientos incrementos térmicos superiores a OPA, que mantuvo el suelo ligeramente por debajo de la temperatura del...
Tipo: Journal article
Palavras-chave: Temperatura del suelo; Acolchado plástico; Solarización.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000400011

COMPORTAMIENTO TÉRMICO DEL SUELO BAJO CUBIERTAS PLÁSTICAS: II. EFECTO DEL POLIETILENO TRANSPARENTE A DIFERENTES PROFUNDIDADES
Provedor de dados: 113
Autores: Misle A.,Enrique; Norero Sch.,Aldo.
Durante noviembre de 1996 se realizó un experimento en la Universidad Católica del Maule, Talca (35º26’ lat. Sur, 71º26’ long. Oeste), en un suelo Haplanthrepts, para determinar la conducta térmica del suelo bajo una cubierta de polietileno transparente (50 m ) a 1, 3, 7 y 15 cm de profundidad, así como el comportamiento térmico transversal (fases 2, 3 y 5). En las fases 1 y 4 se determinó el efecto de cuatro cubiertas plásticas sobre la temperatura del suelo a 7 cm de profundidad, informado en un trabajo anterior. Se realizó la prueba de Tukey (p £ 0,05) para la amplitud térmica con el fin de constatar la confiabilidad de los resultados. Su valor se incrementó alrededor de 10°C hasta 7 cm de profundidad, mostrando que es posible solarizar en esta latitud,...
Tipo: Journal article
Palavras-chave: Temperatura del suelo; Acolchado.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100013

Comportamiento térmico del suelo bajo cubiertas plásticas: III. Simulación
Provedor de dados: 113
Autores: Misle A.,Enrique; Norero Sch.,Aldo.
Se desarrolló un modelo simple de simulación para predecir la temperatura del suelo bajo cubiertas plásticas sobre la base de la solución numérica de la ecuación de flujo de calor en el suelo. Ella requiere definir las condiciones de borde, que en la superficie son resueltas mediante el balance de radiación y energía. También considera un coeficiente de reparto de calor y el albedo de la superficie del suelo cubierto con plástico. Este parámetro es variable de acuerdo a la hora del día. Así se determinó la temperatura superficial del suelo, suponiendo que era la misma del plástico. Para iniciar el proceso de simulación y determinar la temperatura en el perfil del suelo se recurrió a una función periódica que combina la solución analítica y el análisis de...
Tipo: Journal article
Palavras-chave: Temperatura del suelo; Modelo de simulación; Acolchado plástico; Solarización.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000300008

Composición botánica de la dieta de alpacas (Lama pacos L.) y llamas (Lama glama L.) en dos estaciones del año, en praderas altiplánicas de un sector de la Provincia de Parinacota, Chile
Provedor de dados: 113
Autores: Castellaro G.,Giorgio; Ullrich R.,Tamara; Wackwitz,Birgit; Raggi S.,Alberto.
Se determinó la composición de las dietas de alpacas (Lama pacos L.) y llamas (Lama glama L.) que pastorearon praderas altiplánicas de Parinacota, Chile (18°12' lat. Sur; 69°16' long. Oeste; 4390 m.s.n.m.) utilizando microhistología fecal. Las evaluaciones se realizaron en la época seca-invernal y la lluviosa-estival. Se midió la disponibilidad de materia seca (MS) y composición botánica (CB) de la principal pradera, el "bofedal". La disponibilidad de MS varió entre 1860 y 2940 kg ha-1, y la CB fue dominada por Oxychloe andina (Cyperaceae) y Festuca nardifolia (Poaceae). En las dietas dominaron especies del bofedal, especialmente gramíneas (F. nardifolia, Deschampsia caespitosa y Agrostis tolucensis) y graminoides (O. andina), destacando también, especies...
Tipo: Journal article
Palavras-chave: Composición botánica; Dietas; Fecas; Análisis microhistológico; Camélidos; Praderas altiplánicas.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000400004

Composición Corporal y el Efecto de un Programa de Fuerza Auxiliar para Prevenir Lesiones en Musculos Cuádriceps Femoral, Isquiotibiales y Bíceps Femoral en Jóvenes Universitarios Futbolistas
Provedor de dados: 77
Autores: Espinoza-Navarro,O; Valle,S.
El objetivo de esta investigación fue conocer los efectos de un programa de fuerza auxiliar en la prevención de lesiones de los músculos: cuádriceps femoral, isquiotibiales y bíceps femoral en futbolistas universitarios de la ciudad de Madrid, independiente del programa normal de entrenamiento del club universitario. Veinticuatro jugadores universitarios de entre 19 a 28 años participaron en el estudio, separados en grupo control (n=12) y grupo experimental (n=12). En ambos grupos se evaluó inicialmente el desplazamiento y la velocidad (potencia), mediante un transductor de movimiento o "encoder". Posteriormente al grupo experimental se le aplicó un programa de fuerza auxiliar, para reforzar los músculos del muslo, por un período de 6 meses. El Comité de...
Tipo: Journal article
Palavras-chave: Lesiones; Fútbol; Fuerza muscular; España.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300056

Composición Corporal y Estado Nutricional de una Muestra de Estudiantes de 9 a 12 Años de Edad de Colegios Municipalizados de la Comuna de Padre las Casas, Región de la Araucanía-Chile
Provedor de dados: 77
Autores: Martínez,Cristián; Reinike,Otto; Silva,Héctor; Carrasco,Vanessa; Collipal,Erika; Jiménez,Carlos.
El estudio del Índice de Masa Corporal (IMC), es el parámetro recomendado por la OMS para conocer el estado nutricional de acuerdo a la norma técnica nutricional vigente en Chile. Los estudios antropométricos permiten estimar la composición corporal, estudiar la morfología y dimensiones. Este estudio describe la realidad nutricional y la composición corporal de una muestra de los colegios municipalizados de la comuna de Padre las Casas. Evaluamos 122 adolescentes de ambos sexos, 65 hombres (53,2%) y 57 mujeres (46,7%), entre 9 y 12 años de edad. Para obtener la composición corporal se utilizó el método antropométrico descrito por Dhebora Kerr, mientras que la evaluación y clasificación del estado nutricional se realizo de acuerdo a las normas técnica...
Tipo: Journal article
Palavras-chave: Antropometría; Índice de masa corporal; Estado Nutricional.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200010

Composición Corporal y Somatotipo de Futbolistas Chilenos Juveniles Sub 16 y Sub 17
Provedor de dados: 77
Autores: Jorquera Aguilera,Carlos; Rodríguez Rodríguez,Fernando; Torrealba Vieira,María Ignacia; Barraza Gómez,Fernando.
El fútbol juvenil, se profesionaliza cada día más, al punto de incluir a los jóvenes en los equipos adultos que juegan en los Torneos Profesionales. Para que esto ocurra es necesario que los jóvenes deportistas estén físicamente aptos para enfrentar las exigencias físicas del futbol profesional. Se evaluó antropométricamente a un total de 217 sujetos distribuidos en dos grupos, sub 16 y sub 17. Los jóvenes futbolistas, presentan diferencias en la estructura corporal con respecto a futbolistas profesionales, demostrando una falta de desarrollo madurativo y deportivo, que según la evidencia, los hace menos aptos físicamente, para enfrentar exigencias físicas, típicas del futbol profesional. La masa muscular de los sujetos es menor que la de futbolistas...
Tipo: Journal article
Palavras-chave: Antropometría; Composición corporal; Masa muscular; Fútbol.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100044

Composición Corporal y Somatotipo de Mujeres de Entre 16 a 18 Años: Efecto de un Programa Acuático-Aeróbico en el Mejoramiento de la Fuerza Muscular
Provedor de dados: 77
Autores: Pino-Reynals,Anita; Espinoza-Navarro,Omar; De Arruda,Miguel; Urizar-Araya,Carlos.
Las actividades acuáticas son una clara alternativa a los programas de reforzamiento muscular terrestre. El objetivo de este trabajo fue determinar el efecto de un programa de ejercicios acuáticos-aeróbicos sobre pliegues y diámetros corporales y en el mejoramiento de la fuerza muscular de mujeres jóvenes. Doce mujeres de entre 16 a 18 años, sedentarias, seleccionadas intencionalmente fueron sometidas a un programa de ejercicios acuáticos de 18 sesiones, desarrollados en la Piscina Olímpica Municipal de la ciudad de Arica, Chile. Los resultados muestran que las jóvenes presentan un IMC de sobrepeso, con un somatotipo predominantemente endomórfico. Los pliegues corporales de muslo anterior y pantorrilla disminuyen significativamente al final de la...
Tipo: Journal article
Palavras-chave: Ejercicio Acuático; Fuerza muscular; Natación; Chile.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400003

Composición Corporal y Somatotipo en Futbol Femenino: Campeonato Sudamericano Sub-17
Provedor de dados: 77
Autores: Bahamondes Avila,Carlos; Cifuentes Cea,Bernarda Macarena; Lara Padilla,Eleazar; Berral de la Rosa,Francisco José.
Con el objetivo de analizar la composición corporal y el somatotipo en seleccionadas nacionales de futbol femenino, se han estudiado 28 mujeres, 19 seleccionadas de Colombia y 9 de Paraguay, de 16,2 ± 0,66 años de edad, participantes en el Campeonato Sudamericano Sub 17 ­ Chile 2008, clasificatorio para la primera Copa Mundial FIFA de la categoría, Nueva Zelanda 2008. Para la evaluación se siguió el protocolo establecido por la Sociedad Internacional para el Avance de la Cineantropometria ­ ISAK. Se determinó el fraccionamiento del peso corporal total en cinco masas según Kerr. Para establecer el somatotipo se utilizó el modelo propuesto por Heath &amp;amp; Carter. Respecto a las masas corporales, el promedio de los kg y % de MA, MM y MO fue de 18,56...
Tipo: Journal article
Palavras-chave: Fútbol; Antropometría; Rendimiento muscular; Índice músculo-óseo; Biotipo.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200016

Composición Corporal y Somatotipo Referencial de Sujetos Físicamente Activos
Provedor de dados: 77
Autores: Rodríguez,Fernando Javier Rodríguez; Almagià Flores,Atilio Aldo; Yuing Farias,Tuillang; Binvignat Gutierrez,Octavio; Lizana Arce,Pablo.
En nuestro país y en el mundo se han realizado una serie de investigaciones en el área de la morfoestructura humana, pero pocos trabajos que describan el perfil antropométrico de personas jóvenes saludables. Se evaluaron a 100 hombres y 79 mujeres de entre 20 y 29 años de edad, sin factores de riesgo a la salud. Se evaluó de acuerdo a un protocolo de ISAK con variables que permite estimar la composición corporal y el somatotipo de los individuos. De esta manera se presentan las tablas de resultados como una forma de usarlas de referencia. Nuestro grupo de referencia evaluado (CHIREF) con sus resultados de composición corporal, somatotipo e índices corporales, aporta una nueva fuente de información de la V Región y actualizada para Chile, la cual favorecerá...
Tipo: Journal article
Palavras-chave: Antropometría; Composición corporal; Somatotipo.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400028

Composición de Ácidos Grasos (MUFA y CLA) en Tejido Muscular de Bovino Relacionado con la Presencia del Polimorfismo g.878TC en el Gen SCD
Provedor de dados: 77
Autores: Inostroza,K; Larama,G; Sepúlveda,N.
El tejido muscular de muchos animales domésticos es fuente de proteínas, grasa y minerales para los seres humanos y está compuesto por una serie de estructuras que le otorgan propiedades nutricionales y bioquímicas. En los ultimos años se ha identificado un polimorfismo de único nucleótido (SNP) en el gen SCD (g.878TC), que influye sobre la composición de ácidos grasos en los bovinos. El objetivo de este estudio fue determinar la presencia del SNP g.878TC en músculo Longissimus dorsi de bovino (Bos taurus) por medio de la técnica PCR-RFLP. Fue utilizada una muestra de 100 novillos de raza Aberdeen Angus criados y sacrificados en la Región de La Araucanía (Chile). La frecuencia genotípica del polimorfismo fue de: 0,33 para TT, 0,43 para TC y 0,24 para el...
Tipo: Journal article
Palavras-chave: Músculos; Marcadores genéticos; Lípidos; Salud humana.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300028

Composición de la araneofauna en dos especies de árboles nativos Peumus boldus Mol. y Luma apiculata (D.C.) Burret en el parque botánico Pedro del río Zañartu (Hualpen), Concepción, VIII Región, Chile
Provedor de dados: 72
Autores: Aguilera,Milenko A; Casanueva,María E; Hernández,Cristián E.
Además de la cercana relación entre composición comunitaria y recursos disponibles, la estructura física del bosque a menudo se ha citado como un factor importante que afecta los patrones de diversidad de artrópodos. El objetivo de este estudio fue evaluar el efecto de dos especies nativas de árbol, que difieren en su estructura física, sobre la diversidad de araneofauna en el Parque Botánico Pedro del Río Zañartu (Hualpén). Con este fin se estimó la abundancia, diversidad, semejanza y composición de la comunidad de arañas arborícolas asociadas al follaje de dos especies de árboles nativos, Peumus boldus Mol. (boldo) y Luma apiculata (D.C.) Burret (arrayán). Las arañas fueron muestreadas mensualmente usando paraguas entomológico desde marzo del 2001 hasta...
Tipo: Journal article
Palavras-chave: Araneofauna; Chile; Árboles nativos; Diversidad; Estructura comunidad.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200004

COMPOSICION DE LA DIETA DE BRAMA AUSTRALIS VALENCIENNES 1837 EN LA ZONA CENTRO-SUR DE CHILE (VIII REGIÓN) EN OTOÑO 2000 Y VERANO 2001
Provedor de dados: 72
Autores: García M.,Camila; Chong,Javier.
Se estudió la dieta de 216 ejemplares de Brama australis ("reineta"), provenientes de la pesca artesanal del Golfo de Arauco, Chile, durante otoño 2000 y verano 2001. El contenido gástrico de B. australis se analizó cuali y cuantitativamente en relación con la talla, sexo y períodos de muestreos. Se determinó que la reineta posee un reducido espectro trófico en el área de estudio, pues se alimenta casi exclusivamente de crustáceos (eufáusidos), mientras que peces y calamares constituyen presas secundarias u ocasionales. El alto consumo de Euphausia sp. se debería principalmente a que B. australis seleccionaría presas de pequeño tamaño, cuya preferencia alimentaria se encontraría asociada con la época de estudio y la oferta ambiental
Tipo: Journal article
Palavras-chave: Alimentación; Ecología trófica; Reineta; Brama; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200019

COMPOSICION DE LA DIETA DE ONCORHYNCHUS MYKISS (WALBAUM 1792) (PISCES: SALMONIDAE) EN UN SISTEMA FLUVIAL DE BAJA INTERVENCION ANTROPICA: ESTERO NONGUEN, VIII REGION, CHILE
Provedor de dados: 72
Autores: Palma,Alejandro; Figueroa,Ricardo; Ruiz,Víctor H.; Araya,Elizabeht; Berríos,Patricia.
Se estudió la dieta alimentaria de Oncorhynchus mykiss (Walbaum 1792) en un ecosistema fluvial con baja intervención antrópica determinando si hay correspon-dencia entre los ítemes consumidos por el pez y la oferta alimentaria. El área de estudio corresponde al estero Nonguén, una subcuenca costera tributaria del curso inferior del río Andalién (36° 49' a 36° 54'S; 72° 57' a 73° 01'W), que con una orientación general de sur a norte, recorre una distancia de más de 15 km dando forma a una cuenca de 44 km² de superficie. El estudio fue abordado mediante pesca eléctrica en dos períodos estacionales: invierno y primavera. Para ello se definió una secuencia lineal de 5 estaciones de muestreos localizadas en los sectores de ritrón y potamón en los primeros 5...
Tipo: Journal article
Palavras-chave: Oncorhynchus mykiss; Dieta; Estero Nonguén; VIII Región; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200007

Composición de la flora de praderas andinas en la Reserva Nacional Alto Bío-Bío (Lonquimay-Chile) y su relación con el régimen de pastoreo
Provedor de dados: 73
Autores: Fuentes-Ramírez,Andrés; Pauchard,Aníbal; Hauenstein,Enrique.
Las praderas andinas de la Región de La Araucanía son usadas estacionalmente por comunidades Pehuenches como forraje para sus animales. El pastoreo es una de las principales perturbaciones que afectan a las praderas naturales, pudiendo generar cambios a nivel comunitario en la composición y en la riqueza de especies. Con el objetivo de determinar la composición de la flora de las praderas andinas de la Reserva Nacional Alto Bío-Bío (37° S y 70° O) y su relación con la carga animal que soporta cada una, se estudiaron cinco sitios al interior de la reserva: Cuchares Grande, Cajón Chileno, Tralilhue, Cuchares Chico y Mancha de Pinos. En cada sitio se realizaron 20 parcelas al azar, registrándose todas las especies presentes y su cobertura relativa. En total...
Tipo: Journal article
Palavras-chave: Veranadas; Alto Bío-Bío; Riqueza de especies; Perturbación; Sobrepastoreo.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100004

COMPOSICIÓN, ESTRUCTURA Y DIVERSIDAD DE POBLACIONES DE NOTHOFAGUS GLAUCA UBICADAS EN LA ZONA MEDITERRANEA DE CHILE
Provedor de dados: 73
Autores: Muñoz,Fernando; Muñoz,Carolina; Uribe,Matilde; Martín,María Ángela; Molina,Juan Ramón; Herrera,Miguel Ángel; Álvarez,Juan Bautista; Martín,Luís Miguel.
Los bosques de Nothofagus glauca se encuentran ubicados en la zona mediterránea de Chile central. Su eliminación para habilitar suelo para uso agrícola, forestal y ganadero, más la utilización de su madera para leña y carbón, redujo drásticamente su superficie. Se estudiaron un total de cuatro bosques de N. glauca localizados dos en la Cordillera de la Costa y dos en la Cordillera de los Andes de Chile central. A través de inventario forestal: durante el verano de los años 2008 y 2009, se determinó la composición, la estructura y la diversidad de las comunidades habitadas por N. glauca, y se cosechó semillas escalando árboles seleccionados con el propósito de obtener información de la diversidad genética de la especie. Los resultados indicaron que existe...
Tipo: Journal article
Palavras-chave: Nothofagus; Comunidades vegetales; Diversidad alfa y beta; Riqueza de especies.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100009

Composición, estructura y flujo energético del meiobentos frente a Chile central
Provedor de dados: 97
Autores: SELLANES,JAVIER; NEIRA,CARLOS; QUIROGA,EDUARDO.
Se estudió la estructura de la meiofauna metazoaria (a nivel de grandes grupos taxonómicos) y su rol en el flujo de energía en el subsistema bentónico frente a Concepción (~3630' S). Las muestras se recolectaron en mayo y noviembre de 1997 y mayo de 1998 en cinco sitios correspondientes a: interior de la Bahía de Concepción (28 m), boca de la bahía (35 m), plataforma interior (64 m), plataforma intermedia (88 m) y plataforma externa (120 m). El periodo de estudio coincidió con el evento El Niño 1997-1998 (EN). El meiobentos resultó ser poco diverso a nivel de grandes grupos, pero con abundancias y biomasas moderadas a altas, en comparación con los valores promedio reportados en la literatura para el sublitoral fangoso. Nematoda fue el grupo dominante, con...
Tipo: Journal article
Palavras-chave: Meiofauna; Producción secundaria; Flujo energético; El Niño; Chile central.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300006

Composición florística y evaluación de la degradación del bosque pantanoso costero de temu-pitra en la Región de La Araucanía, Chile
Provedor de dados: 73
Autores: HAUENSTEIN,ENRIQUE; PEÑA-CORTÉS,FERNANDO; BERTRÁN,CARLOS; TAPIA,JAIME; VARGAS-CHACOFF,LUIS; URRUTIA,ODETTE.
El área costera de la Región de La Araucanía destaca por la presencia de humedales con vegetación boscosa de temu y pitra, de la asociación Blepharocalyo-Myrceugenietum exsuccae. Actualmente estas formaciones se encuentran afectadas por actividades antrópicas. En este estudio se determinó la flora vascular y se evaluó el nivel de degradación y estado de conservación de estos bosques en seis cuencas hidrográficas del borde costero (Imperial, Comúe, Chelle, Boroa, Boldo y Toltén) de la Región de La Araucanía. Para determinar el estado de conservación se emplearon variables florísticas y territoriales, como la valoración de la influencia de los ecosistemas adyacentes sobre el bosque, la relación superficie/ cuenca y el grado de intervención antrópica. Se...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100008

Composición, origen y valor de conservación de la Ictiofauna del Río San Pedro (Cuenca del Río Valdivia, Chile)
Provedor de dados: 72
Autores: Habit,Evelyn; Victoriano,Pedro.
Basado en muestreos de tres años consecutivos y revisión de literatura, describimos la composición, singularidad y estado de conservación de la ictiofauna del río San Pedro, en la cuenca del río Valdivia. Además, analizamos los posibles orígenes de esta ictiofauna, postulando que parte de la cuenca del río Valdivia ha funcionado como un sumidero, principalmente su parte alta, con aportes de fuentes tanto costero-Pacíficas como del Este de Los Andes. Concluimos que el río San Pedro es de particular valor ictiofaunístico por su alta riqueza específica, endemismos y características biogeográficas.
Tipo: Journal article
Palavras-chave: Fauna íctica; Río San Pedro; Endemismos; Conservación; Chile.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100002

Composición, riqueza de especies y abundancia de insectos defoliadores de actividad nocturna asociados a Aristotelia chilensis (maqui) en el bosque maulino fragmentado
Provedor de dados: 97
Autores: DE LA VEGA,XAVIERA; GREZ,AUDREY A.
En el bosque maulino, la herbivoría sobre Aristotelia chilensis (maqui) es negativamente afectada por la fragmentación del bosque, siendo mayor en el bosque continuo que en los fragmentos, particularmente a inicios de la temporada de crecimiento. Este fenómeno puede deberse a cambios en la dinámica de las poblaciones de defoliadores, esencialmente insectos. En este trabajo se evaluó la abundancia, riqueza de especies y composición de insectos defoliadores de actividad nocturna presentes en A. chilensis en un bosque continuo (600 ha) y en ocho fragmentos remanentes (0,4-20 ha). Los muéstreos se realizaron mensualmente, entre agosto de 2005 y febrero de 2006, en 32 ejemplares adultos de A. chilensis en el bosque continuo y en 32 ejemplares en los fragmentos....
Tipo: Journal article
Palavras-chave: Insectos defoliadores; Bosque maulino; Fragmentación del habitat.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000200006

Composición y abundancia de artrópodos epígeos del Parque Nacional Llanos de Challe: impactos del ENOS de 1997 y efectos del hábitat pedológico
Provedor de dados: 97
Autores: CEPEDA-PIZARRO,JORGE; PIZARRO-ARAYA,JAIME; VÁSQUEZ,HERNÁN.
Mediante el uso de trampas de intercepción, se estudió el efecto de la precipitación y el tipo de hábitat sobre la denso-actividad del ensamble de artrópodos epígeos _en particular Tenebrionidae_ del Parque Nacional Llanos de Challe. Este parque está ubicado en el desierto costero transicional de Chile, en la III Región de Atacama. Los muestreos se realizaron durante tres días por mes (septiembre, octubre y diciembre) en el período de máxima actividad biológica del sistema y en los años 1989 (año no-ENOS seco), 1997 (año ENOS intenso) y 2000 (año no-ENOS húmedo). En las comparaciones se utilizaron dos sitios pedológicamente contrastantes: un hábitat dunario costero y un hábitat pedregoso interior. Se registró la presencia de 15 órdenes de Arthropoda. Los...
Tipo: Journal article
Palavras-chave: Zonas áridas; Desiertos costeros; Artrópodos epígeos; Tenebrionidae; ENOS.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400004

Composición y sobreposición dietaria de Pinguipes chilensis (Perciformes: Pinguipedidae), Cheilodactylus variegatus (Perciformes: Cheilodactylidae) y Aplodactylus punctatus (Perciformes: Aplodactylidae) en el litoral costero valdiviano, Chile
Provedor de dados: 72
Autores: CORNEJO-ACEVEDO,MARÍA FERNANDA; FIERRO,PABLO; BERTRÁN,CARLOS; VARGAS-CHACOFF,LUIS.
Pinguipes chilensis, Cheilodactylus variegatus y Aplodactylus punctatus son especies comunes de ser registradas a lo largo de la costa chilena, no obstante información sobre su alimentación es escasa para la zona sur de nuestro país. Por ello, se analizó la composición y sobreposición dietaria de estas especies para la costa Valdiviana. Los resultados señalan que para el periodo primaveral del año 2010, en P. chilensis (n=41) se identificaron 20 presas, todas caracterizadas por ser invertebrados de gran tamaño, principalmente crustáceos (55%) y moluscos (40%), siendo la especie Homalaspis plana la más representativa (IRI 70%). En Ch. variegatus (n=38) se identificaron 37 presas, mayoritariamente pequeños invertebrados, principalmente crustáceos (49%),...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200003

Composition and Bioactive Properties of Yerba Mate (llex paraguariensis A. St.-Hil.): A Review
Provedor de dados: 117
Autores: Burris,Kellie P; Harte,Federico M; Michael Davidson,P; Neal Stewart Jr,C; Zivanovic,Svetlana.
Yerba Mate is a popular tea beverage produced and consumed in the South American countries of Argentina, Brazil, Chile, Paraguay, and Uruguay, and is processed from the leaves and stems of Ilex paraguariensis A. St.-Hil., a perennial shrub from the Aquifoliaceae family. Production occurs in six stages: harvesting older leaves and small stems, roasting by direct fire, drying under hot air, milling to specified size, aging to acquire optimal sensory attributes, and final packaging. While grown and consumed for centuries in South America, its popularity is increasing in the United States because of demand by consumers for healthier, more natural foods, its filling a niche for a different type of tea beverage, and for Yerba Mate's potential health benefits -...
Tipo: Journal article
Palavras-chave: Antioxidant; Antimicrobials; Natural products; Yerba mate; Tea.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200016

Composition, structure and diversity of a mesquite in Pesquería (Northeastern Mexico)
Provedor de dados: 97
Autores: Alanís-Rodríguez,Eduardo; Molina-Guerra,Víctor M.; Jiménez-Pérez,Javier; Rubio-Camacho,Ernesto A.; Mora-Olivo,Arturo; Collantes-Chávez-Costa,Alejandro; Marroquín-Castillo,Jonathan J.
Abstract  Background: Although the mesquite (mesquital or mezquital in Spanish) is one of the representative ecosystems of the landscapes in the north of Mexico, it is also one of the least studied. This study evaluated the structure (horizontal and vertical) and diversity of a plant community of mesquite in Northeastern Mexico. Three plots of 1,600 m2 each were established. All trees and shrubs with a basal diameter (d0.10) &amp;#8805; 0.5 cm were recorded, and total height (h) and crown diameter (dcrown) were measured.  Results: There were 8 families, 12 genera and 14 species. The genus presenting the most species was Acacia (three species). The most representative family was Fabaceae with seven species. The evaluated community presents a density of 375...
Tipo: Journal article
Palavras-chave: Importance value index; Margalef diversity index; Mesquital; Plant community; Prosopis glandulosa; Shannon index.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2017000100201

Compositional patterns of ruderal herbs in Santiago, Chile
Provedor de dados: 73
Autores: GÄRTNER,ELSA; ROJAS,GLORIA; CASTRO,SERGIO A.
Fragmentation of the natural environment is a consequence of urbanisation. It impacts the biodiversity of native flora that characterises a region. This study focused on characterising the diversity, composition and distribution of native and alien ruderal species present in different suburbs of Santiago de Chile. We found that plant assemblages of ruderal species were characterised by a higher proportion of alien species (69 taxa), whose original distribution corresponds to the Mediterranean Basin (46 taxa), and a low representation of native species (14 taxa). The results show that the spatial distribution of weeds within Santiago was not random, because two clusters were found based on patterns of compositional similarity. Further research should be...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200003

Compositional studies and Biological activities of Perovskia abrotanoides Kar. oils
Provedor de dados: 48
Autores: Ashraf,Sadaf Naz; Zubair,Muhammad; Rizwan,Komal; Tareen,Rasool Bakhsh; Rasool,Nasir; Zia-Ul-Haq,Muhammad; Ercisli,Sezai.
BACKGROUND: Current study has been designed to evaluate the chemical composition of essential and fixed oils from stem and leaves of Perovskia abrotanoides and antioxidant and antimicrobial activities of these oils. RESULTS: GC-MS analysis of essential oil identified 19 compounds with (E)-9-dodecenal being the major component in stem and hexadecanoic acid in leaves. In contrast, GC-MS analysis of fixed oil showed 40 constituents with &amp;#945;-amyrin the major component in stem and &amp;#945;-copaene in leaves. The antioxidant activity showed the highest value of 76.7% in essential oil from leaves in comparison with fixed oil from stem (45.9%) through inhibition of peroxidation in linoleic acid system. The antimicrobial assay tested on different...
Tipo: Journal article
Palavras-chave: Perovskia abrotanoides; Essential oil; Fixed oil; Antioxidant capacity; Antimicrobial activity.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100012

Compositional studies and biological activities of some mash bean (Vigna mungo (L.) Hepper) cultivars commonly consumed in Pakistan
Provedor de dados: 48
Autores: Zia-Ul-Haq,Muhammad; Ahmad,Shakeel; Bukhari,Shazia Anwer; Amarowicz,Ryszard; Ercisli,Sezai; Jaafar,Hawa ZE.
BACKGROUND: In recent years, the desire to adopt a healthy diet has drawn attention to legume seeds and food products derived from them. Mash bean is an important legume crop used in Pakistan however a systematic mapping of the chemical composition of mash bean seeds is lacking. Therefore seeds of four mash bean (Vigna mungo (L.) Hepper, family Leguminoseae) cultivars (NARC-Mash-1, NARC-Mash-2, NARC-Mash-3, NARC-Mash-97) commonly consumed in Pakistan have been analyzed for their chemical composition, antioxidant potential and biological activities like inhibition of formation of advanced glycation end products (AGE) activity and tyrosinase inhibition activity. RESULTS: The investigated cultivars varied in terms of biochemical composition to various...
Tipo: Journal article
Palavras-chave: Nutrients; Antioxidant potential; Mash bean cultivar; Pakistan.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100023

Compounds Derived from Garlic as Bud Induction Agents in Organic Farming of Table Grape
Provedor de dados: 117
Autores: Vargas-Arispuro,Irasema; Corrales-Maldonado,Consuelo; Martínez-Téllez,Miguel Ángel.
Viticulture is one of the most important economic activities in the Northwest of Mexico. A major obstacle for the economic production is the insufficient period of chilling temperatures. This problem leads to poor budbreak, which in turn results in reduced yields. This problem is aggravated when plants are cultivated using the organic farming system, mostly because there are not organically approved restbreaking agents. In this work different products derived from garlic (Allium sativum L.) were obtained and evaluated as stimulate budbreak agent of table grape (Vitis vinifera L.) cvs. Flame Seedless and Perlette. The isolated compounds were chemically identified and include allicin, diallyl disulfide, diallyl trisulfide, 3-vynil-[4H]-1,2-ditiin and...
Tipo: Journal article
Palavras-chave: Flame Seedless; Perlette; Budbreak; Allicin; S-methyl cysteine sulfoxide.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100009

Computed Tomography and Cross Sectional Anatomy of the Metacarpus and Digits of the One-humped Camel and Egyptian Water Buffalo
Provedor de dados: 77
Autores: El-Shafey,Anwar; Sayed-Ahmed,Ahmed.
The use of advanced imaging in diagnostic patient evaluations is increasing as well as the availability of machines for veterinary practices. The purpose of this study was to provide an atlas of synchronized normal computed tomography and cross sectional anatomy of the metacarpus and digits in the one-humped camel and Egyptian water buffalo to provide a basis for diagnosis of their diseases by the aid of CT. One cm contiguous transverse CT images and cross sectional anatomy were obtained and photographed. Clinically applicable anatomic structures were identified and labeled at each level. In both animals, the medullary cavity of the fused third and fourth metacarpal bones was divided internally by a vertical bony septum which was a complete septum in the...
Tipo: Journal article
Palavras-chave: Computed Tomography; Camel; Buffalo; Metacarpus; Digit.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200019

Computer Graphics Applied to Anatomy: A Study of two Bio-CAD Modeling Methods on Finite Element Analysis of Human Edentulous Hemi-Mandible
Provedor de dados: 77
Autores: Rossi,Ana Cláudia; Freire,Alexandre Rodrigues; Botacin,Paulo Roberto; Caria,Paulo HenriqueFerreira; Prado,Felippe Bevilacqua.
Modeling is a step to perform a finite element analysis. Different methods of model construction are reported in literature, as the Bio-CAD modeling. The purpose of this study was to perform a model evaluation and application using two methods of Bio-CAD modeling from human edentulous hemi-mandible on the finite element analysis. From CT scans of dried human skull was reconstructed a stereolithographic model. Two methods of modeling were performed: STL conversion approach (Model 1) associated to STL simplification and reverse engineering approach (Model 2). For finite element analysis was used the action of lateral pterygoid muscle as loading condition to assess total displacement (D), equivalent von-Mises stress (VM) and maximum principal stress (MP). Two...
Tipo: Journal article
Palavras-chave: Computational modeling; Mandible; Finite element analysis; Biomechanics.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300011

Comunicación Bilateral de los Nervios Músculocutáneo y Mediano: Aspectos Morfológicos e Importancia Clínica
Provedor de dados: 77
Autores: Cerda,Aladino; Suazo Galdames,Iván.
Las comunicaciones entre los ramos terminales de plexo braquial son frecuentes y tienen importancia en la evaluación de traumatismos y procedimientos quirúrgicos de las regiones axilar y braquial. En este artículo presentamos un caso en el que durante la disección de rutina del miembro superior, se observó la presencia de comunicaciones bilaterales entre los nervios musculocutáneo y mediano. Los ramos comunicantes fueron descritos en su trayecto, relaciones y morfometría y se discutió acerca de la prevalencia e importancia clínica de estas comunicaciones.
Tipo: Journal article
Palavras-chave: Plexo braquial; Nervio musculocutáneo; Nervio mediano; Región axilar; Región braquial.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200048

Comunicación Masiva del Ramo Superficial del Nervio Radial con el Nervio Cutáneo Antebraquial Lateral, Implicancias Anatomo-Clínicas: Reporte de un Caso
Provedor de dados: 77
Autores: Inzunza A,Martín; Salgado A,Guillermo; González S,Andrea; De la Cuadra F,Juan Carlos; Inzunza H,Oscar.
La distribución de los ramos nerviosos sensitivos en el borde lateral y en el dorso de la mano han sido descritos con mayor exactitud en las últimas décadas, debido al avance de las técnicas de electrodiagnóstico que ofrecen un alto rendimiento, las cuales han permitido detectar que alrededor del 40% de la población examinada presenta algún grado de variación anatómica en el territorio de distribución de los nervios involucrados. En este caso presentamos una variación anatómica bilateral extremadamente rara, que involucra al ramo superficial del nervio radial (NRS) y al nervio cutáneo antebraquial lateral (CABL); donde NRS se conecta de forma íntegra con el ramo medial de CABL, formándose así un tronco común (TC) que se distribuye por la región dorsal de...
Tipo: Journal article
Palavras-chave: Nervio radial; Nervio cutáneo lateral antebraquial; Variación anatómica; Inervación; Mano.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300003

Comunicación Masiva del Ramo Superficial del Nervio Radial con el Nervio Cutáneo Antebraquial Lateral, un Análisis Morfométrico. 1+1 &amp;#8804; 2
Provedor de dados: 77
Autores: Salgado A,Guillermo; Inzunza A,Martin; Cruzat C,Claudio; Inzunza H,Oscar.
La distribución de los ramos nerviosos sensitivos en el borde lateral y en el dorso de la mano han sido descritos con mayor exactitud en las últimas décadas, debido al avance de nuevas técnicas de diagnóstico, las cuales han permitido detectar que alrededor del 40% de la población examinada presenta algún grado de variación anatómica en el territorio de distribución de los nervios involucrados. Conocer el número de fibras que componen un ramo nervioso cutáneo de la región de la mano, ha adquirido mayor relevancia con el desarrollo de técnicas de microcirugía y de ultrasonografía, procedimientos que han demostrado la utilidad de este conocimiento en el diagnóstico y tratamiento de las lesiones nerviosas. Así, la arquitectura fascicular, el área adiposa y el...
Tipo: Journal article
Palavras-chave: Nervio radial; Nervio cutáneo-lateral antebraquial; Morfometría; Fascículo; Variación anatómica.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300007

COMUNICACIONES ORALES
Provedor de dados: 48
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000300005

Comunidad ectomicorrícica en una cronosecuencia de Pinus radiata (Pinophyta: Pinaceae) de la zona de transición climática mediterráneo-templada de Chile central
Provedor de dados: 97
Autores: PALACIOS,YUSSI M; PALFNER,GÖTZ; HERNÁNDEZ,CRISTIÁN E.
En ecosistemas naturales y plantaciones, las coníferas establecen asociaciones mutualistas con una comunidad diversa de hongos micorrícicos. El estudio de este tema en Sudamérica es aún incipiente, y no existen antecedentes sobre la dinámica temporal de esta comunidad, y menos de sus potenciales causas, a pesar de su importancia para un país forestal como Chile. En el presente trabajo se evaluó la dinámica de la comunidad ectomicorrícica, identificando y cuantificando los hongos formadores de esta asociación en raíces finas de Pinus radiata en plantaciones de 3, 10 y 20 años. Los resultados confirman que la comunidad ectomicorrícica de P. radiata cambia con la edad de los árboles, la cual difiere más bien en el patrón de dominancia que en la riqueza de...
Tipo: Journal article
Palavras-chave: Diversidad fúngica; Sucesión morfotipos ectomicorrícicos plantaciones forestales.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000100005

Comunidades de escorpiones (Arachnida: Scorpiones) del desierto costero transicional de Chile
Provedor de dados: 97
Autores: AGUSTO,PABLO; MATTONI,CAMILO I; PIZARRO-ARAYA,JAIME; CEPEDA-PIZARRO,JORGE; LÓPEZ-CORTÉS,FRANCISCO.
En Chile, el orden Scorpiones está representado por 35 especies, distribuidas en las familias Bothriuridae, Iuridae y Buthidae. La mayoría de ellas son elementos endémicos, adaptados a condiciones xéricas. Nosotros estudiamos la estructura taxonómica de la escorpiofauna asociada a las formaciones vegetacionales presentes en el desierto costero transicional de Chile (25-32º S). Las capturas se realizaron con trampas de intercepción y luz UV. La información de terreno se complementó con antecedentes señalados en la literatura y material de referencia. Identificamos la presencia de nueve especies en un total de 226 especímenes capturados, pertenecientes a las familias Bothriuridae y Iuridae. Los géneros más abundantes de Bothriuridae, representada por ocho...
Tipo: Journal article
Palavras-chave: Scorpiones; Bothriuridae; Iuridae; Desierto costero; Zonas áridas; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000400001

COMUNIDADES FUNGICAS ASOCIADAS A RAMAS Y RITIDOMA TRONCAL DE GEOFFROEA DECORTICANS (Gill. ex Hook. et Arn.) Burkart (FABACEAE)
Provedor de dados: 73
Autores: Bianchinotti,María Virginia.
Se estudió la micobiota asociada con plantas sanas en pie de Geoffroea decorticans (Fabaceae) mediante muestreos estacionales durante un año. Se identificaron 51 micromicetes (en su mayoría celomicetes) asociados a la superficie de ramas y ritidoma troncal. En el otoño se registró un aumento de la diversidad específica para todos los estratos muestreados. Según el espectro de estrategias establecido se observó un aumento del componente exclusivo de la comunidad asociada al ritidoma. De acuerdo a las técnicas de análisis multivariado utilizadas para analizar la frecuencia de aparición de las especies ("clustering" y ACP) se encontraron diferencias en la micobiota de acuerdo al sustrato y a la posición de éste en el dosel
Tipo: Journal article
Palavras-chave: Geoffroea decorticans; Fabaceae; Micromicetes; Ecología.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100001

Con aportes Milenium: Ponen en marcha el MIFAB, Instituto Milenio  de Biología Fundamental y Aplicada
Provedor de dados: 48
Autores: PRENAFETA J,SERGIO.
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97601999000400002

CONA and UEA-I Ligands During Tooth Development Reveals Differences between Human and Rodents Models and Shows the Beginning of Mineral Extracelular Matrix Secretion
Provedor de dados: 77
Autores: Iglesias,Déborah Pitta Paraíso; Rego,Moacyr Jesus Barreto de Melo; Beltrão,Eduardo Isidoro Carneiro; Sobral,Ana Paula Veras.
Many of Glycobyological aspects of human development remain still unclear, mainly in oral science, and this could be observed in a lack of literature with few and old papers about this subject. During tooth histo-morphogenesis changes occur in basement membrane composition, expression of signaling molecules and in localization of cell surface components, where glyco components could be involved. In this sense, this work aimed to analyze the ConA ligands commonly founded in glycoproteins cores and UEA-I ligands since fucolization is a Key event in many physiological and pathological processes. Therefore 15 jaws of human fetuses were ethically obtained, histologicaly processed and then submitted to lectin histochemistry with appropriated controls. The...
Tipo: Journal article
Palavras-chave: Odontogenesis; Carbohydrates; Lectin histochemistry.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300056

Concepción de Estudiantes y Docentes del Buen Profesor Universitario: Facultad de Medicina de la Universidad de La Frontera
Provedor de dados: 77
Autores: Cabalín Silva,Daisy; Navarro Hernández,Nancy; Zamora Silva,José; San Martín González,Silvia.
Actualmente la calidad del Profesor Universitario pasa por los nuevos roles que debe asumir acorde al paradigma educativo de centrar el proceso enseñanza-aprendizaje en el estudiante. Es por ello que el presente estudio busca explorar la representación que estudiantes y docentes de la Facultad de Medicina de la Universidad de La Frontera tienen en relación al concepto "Buen Profesor Universitario". El estudio se enmarca en una investigación cualitativa permitiendo acceder al mundo conceptual de los individuos y a las redes de significados utilizando la técnica de Redes Semánticas Naturales. Se aplicó la encuesta a 104 docentes de diferentes profesiones y 293 estudiantes del último año curricular. Cada uno de ellos expresó con diez palabras la...
Tipo: Journal article
Palavras-chave: Perfil profesor universitario; Redes semánticas; Competencias.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100042

Conceptualización de los Estudiantes sobre el Buen Profesor Universitario en las Carreras de la Salud de la Universidad de La Frontera - Chile
Provedor de dados: 77
Autores: Cabalín Silva,Daisy; Navarro Hernández,Nancy.
La tendencia educativa de centrar los procesos en el estudiante, implica un cambio de rol en el profesorado y desarrollo de nuevas competencias; indagarlas resulta relevante. Para ello se planteó un estudio cualitativo con el propósito de conocer la representación del concepto "Buen profesor universitario", que tienen los estudiantes de primer año de las Carreras de la Salud de la Facultad de Medicina de la Universidad de La Frontera, en base a la técnica de redes semánticas naturales. La muestra estuvo constituida por 277 estudiantes de las carreras de Enfermería (43), Kinesiología (38), Medicina (53), Nutrición (30), Odontología (57), Obstetricia (24) y Tecnología Médica (32). En el análisis de datos se obtuvieron los valores J, M, Conjunto SAM y FMG...
Tipo: Journal article
Palavras-chave: Profesor universitario; Redes semánticas; Competencias.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400017

CONCEPTUALIZACIÓN SEMÁNTICA DEL TÉRMINO ANATOMÍA HUMANA POR LOS ESTUDIANTES DE MEDICINA
Provedor de dados: 77
Autores: Collipal,E; Cabalín,D; Vargas,J; Silva,H.
La memoria juega un papel crucial en el funcionamiento humano, debido a que todas las actividades, desde la más simple a la más compleja, requieren de un sistema de memoria activo, que guíe las acciones. En relación a la memoria semántica, ésta es necesaria para el uso del lenguaje, organiza el conocimiento que una persona posee acerca de las palabras y símbolos verbales, sus significados y referencias y las relaciones entre ellos. Con el propósito de analizar el significado que tiene, la Anatomía Humana, para los alumnos de Medicina en el transcurso de su Carrera, hemos realizado este trabajo utilizando la técnica de redes semánticas naturales. Entrevistamos a 70 alumnos de la Carrera de Medicina (40 de segundo año y 30 internos 6 y 7 años) que en el...
Tipo: Journal article
Palavras-chave: Redes semánticas; Anatomía; Estudiantes.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000300002

Condensed Tannin Concentrations of Three Lotus Species Grown in Different Environments
Provedor de dados: 117
Autores: Acuña,Hernán; Concha,Alex; Figueroa,Marcos.
Condensed tannins (CT) present in Lotus spp., depending on their concentration in the plant, can prevent bloating and improve protein absorption in ruminants. With the objective to know the variability of this characteristic, the CT concentration (% dry matter basis) was determined by the butanol-HCl procedure in 13 cultivars of Lotus corniculatus L. (Lc) introduced from North and South America and Oceania, 11 accessions of Lotus tenuis Waldst. &amp;amp; Kit. ex Willd. (Lt), and 22 accessions of Lotus uliginosus Schkuhr (Lu) collected in Chile, from 32° to 38° S and 36° to 46° S, respectively. The field experiments, with two randomized complete blocks, were established in autumn 1998, in five different environments in the central-southern zone of Chile...
Tipo: Journal article
Palavras-chave: Condensed tannins.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100004

Condrosarcoma Mesenquimal Sinonasal Grado Tres y Carcinosarcoma de Glándula Mamaria de un Canino: Estudios Clínico e Histopatológico
Provedor de dados: 77
Autores: Roque Rodríguez,Anita; Ochoa Amaya,Julieta; Narváez Cancimansi,July.
A la Clínica Veterinaria de la Universidad de los Llanos, llegó un canino hembra de 9 años de edad raza Chow Chow, cuyo motivo de consulta fue epistaxis bilateral 4 meses atrás y una masa en la región nasal. Según lo reportado por el propietario, la masa había comenzado a salir 1 mes atrás del día de la consulta. Al examen clínico presentaba una masa subdérmica en la región nasal superior de 2 cm de diámetro. Se realizó una citología de la misma y se encontraron células inflamatorias sin presencia de células neoplásicas. El paciente volvió al mes y la masa con un diámetro de 5cm, estaba ubicada en la región nasal superior y región zigomática. El can presentaba disnea, anorexia, deshidratación del 6%, secreción mucopurulenta nasal y ocular, midriasis...
Tipo: Journal article
Palavras-chave: Canino; Condrosarcoma sinonasal; Carcinosarcoma de glándula mamaria.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400014

Conducta alimentaria de Daphnia ambigua Scourfield 1947, Moina micrura Kurz 1874 y Ceriodaphnia dubia Richard 1895 (Cladocera) frente a un gradiente de concentración de alimento
Provedor de dados: 97
Autores: MARTINEZ,GINGER.
Debido a que Cladocera es el grupo de microfiltradores más abundante del zooplancton límnico y cuyas poblaciones se encuentran usualmente limitadas por alimento, la respuesta de los individuos frente a un gradiente de concentración de recursos tendría significativas implicancias sobre los patrones poblacionales y comunitarios. Se comparó la conducta alimentaria de Moina micrura, Ceriodaphnia dubia y Daphnia ambigua (Cladocera) frente a las microalgas Chlorella sp. y Oocystis sp. (Chlorophyceae) mediante los siguientes parámetros: Tasa de Ingesta Máxima (Imax), Concentración Limitante Incipiente (CLI) y Eficiencia de Consumo (b), los cuales fueron obtenidos a través de un modelo de respuesta funcional. Los resultados mostraron que D. ambigua presentó las...
Tipo: Journal article
Palavras-chave: Conducta alimentaria; CLI; Eficiencia de consumo; Microfiltradores; Cladocera.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100006

Conducta de forrajeo del gastrópodo Acanthina monodon Pallas, 1774 (Gastropoda: Muricidae) en el intermareal rocoso de Chile central
Provedor de dados: 97
Autores: SOTO,RUBÉN E.; CASTILLA,JUAN C.; BOZINOVIC,FRANCISCO.
En el presente trabajo investigamos aspectos de la ecología y conducta de forrajeo de Acanthina monodon, un gastrópodo murícido que habita en el intermareal rocoso de Chile central. En terreno, estudiamos las variaciones temporales en su distribución, densidad y dieta. En el laboratorio, cuantificamos la tasa de consumo, las preferencias alimentarias, el tiempo de ingestión y la rentabilidad energética obtenida con distintos tipos de presas mediante experimentos y registros en video. Las mayores densidades de individuos de A. monodon fueron observadas en la franja intermareal cercana al nivel cero de marea. En terreno, A. monodon realiza sus actividades de forrajeo principalmente durante la noche y su dieta consistió principalmente de mitílidos (95 %) y...
Tipo: Journal article
Palavras-chave: Gastrópodo; Intermareal; Chile central; Forrajeo; Selección de presas.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000100012

Conductancia hidráulica foliar y vulnerabilidad a la cavitación disminuyen con la altitud en Phacelia secunda J.F. Gmel. (Boraginaceae)
Provedor de dados: 73
Autores: HERNÁNDEZ-FUENTES,CAROLINA; BRAVO,LEÓN A.; CAVIERES,LOHENGRIN A.
Los ecosistemas de alta montaña se caracterizan por presentar temperaturas bajo cero durante gran parte del año. Estos episodios de temperaturas bajo cero podrían inducir embolismo en las plantas que habitan estos ecosistemas ya que durante el congelamiento se generan burbujas de aire, las que pueden expandirse durante el descongelamiento conduciendo a la cavitación. La probabilidad de embolismo o cavitación en un conducto xilemático es inversamente proporcional a su diámetro. Sin embargo, la reducción del diámetro de los vasos, por pequeña que sea, disminuye considerablemente la conductividad de éstos. La conductancia hidráulica de la hoja (Kf) está definida como la proporción entre el flujo de agua a través de la hoja y la diferencia de potencial hídrico...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100011

CONDUCTIVIDAD HIDRÁULICA EN MONOLITOS DE SUELO DE CHILE CENTRAL
Provedor de dados: 127
Autores: Casanova P,Manuel  ; Salazar G,Osvaldo; Seguel S,Oscar; Noguer A,Verónica.
Se evaluó, con tensioinfiltrómetro y en condiciones de laboratorio, la conductividad hidráulica de suelos en distintos gradientes de pendiente (0%, 15%, 20% y 25 %) utilizando cuatro monolitos de clases texturales contrastantes (S A, S FA, S Fa y SaF), provenientes de suelos (Fluventic Haploxerolls y Typic Xerochrepts) de la zona central de Chile. Se emplearon 13 potenciales de suministro de agua (&amp;#936;s) entre -140 y -20 mm. Obtenida la conductividad hidráulica insaturada (K&amp;#936;) para cada &amp;#936;s , los valores pareados [ln(K&amp;#936;) y &amp;#936;s] fueron ajustados a un modelo bilineal, asumiendo que una función exponencial continua de K&amp;#936; es aplicable al sistema macroporoso y mesoporoso, con un quiebre a un potencial límite. La...
Tipo: Journal article
Palavras-chave: Conductividad hidráulica; Monolito de suelo; Gradiente de pendiente; Textura de suelo; Tensioinfiltrómetro.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000300004

Condylar Resorption After Orthognathic Surgery: A Systematic Review
Provedor de dados: 77
Autores: de Moraes,Paulo Hemerson; Rizzati-Barbosa,Célia Marisa; Olate,Sergio; Moreira,Roger Willian Fernandes; de Moraes,Márcio.
The aim of this research was to evaluate the risk factors related to condylar resorption (CR) after orthognathic surgery. Was realized a systematic review with a search of the literature performed in the electronic databases PubMed, MedLine, Ovid, Cochrane Library for current evidence in the world literature as conducted, and relevant articles were selected in according to inclusion and exclusion criteria and the findings were compared. Eight papers, (follow-up 12 months to 69 months) were including. A sample of 2567 patient with mandible or bi maxillary surgery with an age range from 14 to 46 year old was observed. In 137 patients (5.3%) CR was observed , with a 97.6% (122) female. CR was related to 118 cases with mandibular deficiencies with high...
Tipo: Journal article
Palavras-chave: Condylar resorption; Orthognathic surgery; TMJ dysfunction.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300042

Cone-beam Computed Tomography Analysis of the Frontal Sinus in Forensic Investigation
Provedor de dados: 77
Autores: Morais Marques,Jeidson Antonio; de Oliveira Musse,Jamilly; Cabús Gois,Bruno; Cavalcante Galvão,Luis Carlos; Paranhos,Luiz Renato.
The frontal sinuses can provide significant evidence for forensic identification. The peculiarity of the frontal sinus contours allows a precise and meticulous analysis, reducing the risk of errors on the part of the forensic experts. To describe the use of cone-beam computed tomography as an alternative to obtaining images of the frontal sinuses. In addition, it is proposed the adoption of some anatomic references to do the axial slicing, which should have its plan being tangent to the upper limit of the orbital cavities, as well as the sagittal slicing, which should be done under the midline, so that all sinus boundaries would be observed while error margin in obtaining comparative images would be reduced. The comparison of frontal sinus images by...
Tipo: Journal article
Palavras-chave: Computed tomography; Frontal sinus; Forensic medicine.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200046

Configuration of Canal System in the Mesiobuccal Root of Maxillary First Molars
Provedor de dados: 77
Autores: Spalding,Marianne; Rezende,Karla Mayra; Silveira,Maria Claudia Garcia; Valera,Márcia Carneiro; Leite,Horácio Faig.
Knowledge on internal dental morphology is extremely important to the correct execution of the treatment and modeling of root canals. The aim of the present study was to analyze, "in vitro", the configuration of the canal system in the mesial root of 180 maxillary first molars obtained from a Brazilian sample. The teeth diaphanized in order to confirm the presence of the MB2 canal and to determine the internal anatomy. Only in 41 % of the teeth the orifice of MB2 canal emerged from the pulp chamber floor. Among teeth two apical foramina were found in 23.3 %, a single apical foramen was observed in 15,5 % and three apical foramina were present in 2,2 %. Considering the hole sample, the MB2 canal was observed in 65.4 %, merged with the MB1 or branching from...
Tipo: Journal article
Palavras-chave: Molar; Root canal; Anatomy; Endodontics.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200012

Confirmation of the presence of Alsodes pehuenche Cei, 1976 (Anura, Alsodidae) in Chile: morphological, chromosomal and molecular evidence
Provedor de dados: 72
Autores: Correa,Claudio; Pastenes,Luis; Iturra,Patricia; Calderón,Pilar; Vásquez,Dayana; Lam,Natalia; Salinas,Hugo; Méndez,Marco A.
The presence of Alsodespehuenche in Chile was reported in the year 2010, based on the observation of larvae near the Chilean-Argentinean border, about 3 km east of the northeast corner of the Laguna del Maule (Región del Maule, Chile). The taxonomic history of this species dates from 1965, with the re-discovery of Telmatobius montanus (which was later transferred to the genus Alsodes) in two localities, near the Laguna del Maule and Valle Pehuenche, located in Chile and Argentina, respectively. The literature review shows that the locality of Argentina described in 1965 became the type locality of A. pehuenche, while the Chilean locality was ignored; thus this latter locality continues to be a valid record for A. montanus. In this study we provide...
Tipo: Journal article
Palavras-chave: Andes Range; Laguna del Maule; Microendemism; Spiny-chest frog; Valle Pehuenche.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200006

Congelación Ultra Rápida de Espermatozoides Humanos: Efecto sobre la Función Espermática y Producción de Especies Reactiva de Oxígeno
Provedor de dados: 77
Autores: Berrios S,Olga; Sánchez G,Raúl.
El incremento del número de pacientes que desean mantener su fertilidad, ya sea por motivos oncológicos o de fertilidad, como son los pacientes con enfermedades infecciosas virales trasmitidas por vía sexual, o que se someten en forma voluntaria a la esterilización quirúrgica, requieren de métodos de congelación que preserven en forma adecuada la función de los espermatozoides. En el área de la criobiología, la utilización de técnicas de congelación ultrarrápida ha permitido preservar en forma exitosa ovocitos, embriones y tejido ovárico. Este método se ha incorporado recientemente para preservar el gameto masculino. El presente estudio evalúa el efecto de la congelación ultrarrápida (vitrificación) sobre la función espermática de 10 donantes...
Tipo: Journal article
Palavras-chave: Espermatozoides humanos; Criopreservación; Congelación ultra rápida; Función espermática; Especies reactivas de oxígeno.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300039

Connection between Radial and Ulnar Nerves at Humeral Level And Its Clinical Significance: A Cadaveric Case Report
Provedor de dados: 77
Autores: Taheri,Mohammad Mehdi Hassanzadeh; Afshar,Mohammad.
Variations of the terminal branches of the brachial plexus in the upper limb are abundant and frequently have been reported. But connection between its radial and ulnar nerves at humeral level is very rare. During routine dissection of the right arm of a 75-year-old male cadaver in the Department of Anatomy of Birjand University of Medical Sciences (BUMS), in Iran, we observed a connection between radial and ulnar nerves, and from the literature reviewed, we found only two cases that had been reported previously, one of them was unilateral and the other bilateral. Awareness of such variations are very important for surgeons and diminish the possible complication of regional anesthesia and surgical procedures, hence, we decided to report it.
Tipo: Journal article
Palavras-chave: Radial nerve; Brachial plexus; Ulnar nerve; Anatomical variation; Connection.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400060

Consecuencias de la ruptura de mutualismos planta-animal para la distribución de especies vegetales en las Islas Baleares
Provedor de dados: 97
Autores: TRAVESET,ANN.
Una modificación del hábitat como puede ser la introducción de especies animales exóticas que desplazan a las nativas, reduciendo sus poblaciones o conduciéndolas a la extinción, puede resultar en la ruptura de interacciones entre especies, las cuales pueden haber evolucionado durante millones de años. Los sistemas insulares son especialmente vulnerables a dichas perturbaciones, al ser normalmente menos complejos y poseer un menor número de especies que los continentales. En el presente trabajo se documentan las consecuencias que ha tenido la desaparición de la interacción planta-dispersor, después de la introducción de mamíferos carnívoros en las Islas Baleares, para las poblaciones de dos arbustos: Cneorum tricoccon L., con una distribución microareal en...
Tipo: Journal article
Palavras-chave: Dispersión de semillas; Cneorum tricoccon; Daphne rodriguezii; Saurocoria; Extinciones en islas.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100011

Consecuencias de las variaciones microclimáticas sobre la visita de insectos polinizadores en dos especies de Chaetanthera (Asteraceae) en los Andes de Chile central
Provedor de dados: 97
Autores: TORRES-DÍAZ,CRISTIAN; CAVIERES,LOHENGRIN A; MUÑOZ-RAMÍREZ,CARLOS; K. ARROYO,MARY T.
La actividad de polinizadores puede ser afectada por factores bióticos (e.g., densidad floral en el parche, despliegue floral) o por factores abióticos (e.g., temperatura, velocidad de viento, nubosidad). A pesar de la notable variación local, estacional e interanual en temperatura en zonas alpinas, las consecuencias de la variación microclimática local sobre la actividad de los polinizadores han recibido escasa atención en ambientes de alta montaña. En este estudio comparamos las tasas de visita a flores de polinizadores realizadas sobre poblaciones de exposición norte y oeste, en Chaetanthera apiculata (3.100 m de altitud), y en poblaciones de exposición este y oeste en C. lycopodioides (3.300 m de altitud). Se estudiaron los sistemas de reproducción de...
Tipo: Journal article
Palavras-chave: Microclima; Densidad floral; Tasa de visita floral; Chaetanthera; Alta montaña; Andes; Sistema reproductivo; Cambio climático.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400007

Conservación de la biodiversidad en Chile, ¿legalmente suficiente?: La necesidad de cartografiar la ley antes de decidir
Provedor de dados: 97
Autores: PELLET,PATRICIO F.; UGARTE,EDUARDO; OSORIO,ENZO M.; HERRERA,FABIOLA D.
El 99,8 % del territorio donde se sustenta la biodiversidad es rural y ha estado tradicionalmente regulado por legislación dispersa, sectorial e inorgánica. La legislación moderna, más holística, como la Ley de Bases Generales del Medio Ambiente adolece de imperfecciones relacionadas con la vigencia, la interpretación y, sobre todo, el que la ley se haga cumplir. En este trabajo argumentamos que la aplicación de modelos tomados de la literatura ecológica buscando apoyar la biología de conservación puede ser complementada fuertemente si es acompañada de una medición de la superficie territorial (cantidad y distribución en el espacio) efectivamente afectada por la legislación vigente de protección ambiental. Nuestro trabajo intenta dar respuesta a la...
Tipo: Journal article
Palavras-chave: Biodiversidad; Bosque nativo; Legislación ambiental; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000100009

Conservación de la biodiversidad en Chile: Nuevos desafíos y oportunidades en ecosistemas terrestres y marinos costeros
Provedor de dados: 97
Autores: JORQUERA-JARAMILLO,CARMEN; VEGA,J. M. ALONSO; ABURTO,JAIME; MARTÍNEZ-TILLERÍA,KARINA; F. LEON,MARIO; A. PÉREZ,MIGUEL; GAYMER,CARLOS F.; SQUEO,FRANCISCO A.
La pérdida de la biodiversidad producida por el crecimiento demográfico, la demanda por recursos y la actividad productiva es contradictoria con el reconocimiento de su importancia. En ecosistemas terrestres, el Sistema Nacional de Áreas Protegidas del Estado (SNASPE) contiene cerca del 19 % del territorio de Chile continental; aunque no representa todos los ecosistemas con especies amenazadas, puede ser complementado implementando nuevas áreas protegidas públicas (AP) y privadas (APP). El desarrollo de áreas marinas protegidas (AMP) es incipiente, y algunas iniciativas comparten la responsabilidad de conservación con los usuarios locales. En Chile, un conjunto de reglamentos, normas legales y tratados internacionales promueven distintas oportunidades de...
Tipo: Journal article
Palavras-chave: Áreas marinas protegidas; Áreas silvestres protegidas; Conservación privada; Participación ciudadana.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000300002

Conservation biology in Chile: Are we fulfilling our social contract?
Provedor de dados: 97
Autores: SIMONETTI,JAVIER A.
Biodiversity conservation needs to be informed by science. On this regard, scientific efforts ought to be allocated to tackle research priorities; offer sound and explicit advice, and results ought to be translated into conservation plans and programs. If such conditions are met, scientists would be fulfilling their social contract, sensu Lubchenco. In this brief essay I analyze the fulfillment of such a contract in Chile. In general, the scarce priorities set for addressing conservation issues are not considered, only a third of scientific publications in conservation-related issues offer explicit advice and a minor fraction of relevant scientific information is considered in the preparation of conservation plans. Current mismatch between conservation...
Tipo: Journal article
Palavras-chave: Conservation practice; Conservation research.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200002

Conservation of biodiversity in private lands: are Chilean landowners willing to keep threatened species in their lands?
Provedor de dados: 97
Autores: Zorondo-Rodríguez,Francisco; Reyes-García,Victoria; Simonetti,Javier A.
BACKGROUND: The biological conservation in private lands largely depends upon landowners' willingness to keep populations of wild species on them, an issue highlighted by the Convention on Biological Diversity. In this study, we aim (i) to understand small landowners' behavioural intentions, or relative intensity to adopt a given behaviour, towards threatened wildlife and (ii) to assess the role of local ecological knowledge, awareness of protected area, and forest ownership on landowners' behavioural intentions towards threatened biodiversity. We interviewed peasants living around Los Queules National Reserve in Central Chile. RESULTS: Interview results showed that behavioural intentions towards threatened species were species-dependant. Results also...
Tipo: Journal article
Palavras-chave: Attitude; Central Chile; Human-nature relationship; Maulino forest; Peasant.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100004

Conservation of Brycon orbignyanus natural populations and stocks for their reproductive, genetic, environmental sustainability: A model for species threatened with extinction
Provedor de dados: 118
Autores: Lopera-Barrero,N. M.
Several ecological and climatic factors, especially those related to human activities, have been contributing to the disappearance of natural populations of piracanjuba (Brycon orbignyanus). Due to the importance of these fish to the ecosystems in which they are located and their qualities of fast growth and ability to adapt to controlled environments, producers have expressed increased interest in recent years in using this species, with particular aims of increasing production, and participation in conservation programs. In this study, strategies for the sustainable management of B. orbignyanus are idealized and discussed, with the goals of perfecting the reproductive, genetic, environmental and sanitary management of this species and suggestions for...
Tipo: Journal article
Palavras-chave: Animal welfare Brycon orbignyanus; Environmental conservation fish; Genetic bank genetic conservation piracanjuba reproductive management.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000200004

CONSERVATION STATE OF SILURIFORMES FISHES FROM THE RAMSAR SITE JAAUKANIGAS (MIDDLE PARANA RIVER), ARGENTINA
Provedor de dados: 72
Autores: Cordiviola,Elly; Campana,Mirta; Demonte,Danilo; del Barco,Daniel; Trógolo,Alicia.
The Siluriformes conservation state was quantified by means of the SUMIN index, composed by the sum of 12 outstanding variables for the species survival and/or conservation. An arranged list of the thirty -three Siluriformes species from the Ramsar Site was obtained based on a gradient of conservation necessity. The species were defined as Vulnerable of Maximum Priority: Pseudoplatystoma corruscans, P. f. fasciatum, Luciopimeloduspati and Hemisorubimplatyrhinchos; species Vulnerables of Special Attention: Oxydoras kneri, Ageneiosus valenciennesi, Sorubim lima, Platydoras costatus, Pterodoras granulosus, Sturisoma robustum, Trachydoras paraguayensis and Ageneiosus brevifilis. The remaining species, were qualified as Not Threatened: Corydoras paleatus,...
Tipo: Journal article
Palavras-chave: Conservation index; Ichthyofauna; South America.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000200006

Conserved genes and pathways in primary human fibroblast strains undergoing replicative and radiation induced senescence
Provedor de dados: 48
Autores: Marthandan,Shiva; Menzel,Uwe; Priebe,Steffen; Groth,Marco; Guthke,Reinhard; Platzer,Matthias; Hemmerich,Peter; Kaether,Christoph; Diekmann,Stephan.
BACKGROUND: Cellular senescence is induced either internally, for example by replication exhaustion and cell division, or externally, for example by irradiation. In both cases, cellular damages accumulate which, if not successfully repaired, can result in senescence induction. Recently, we determined the transcriptional changes combined with the transition into replicative senescence in primary human fibroblast strains. Here, by &amp;#947;-irradiation we induced premature cellular senescence in the fibroblast cell strains (HFF and MRC-5) and determined the corresponding transcriptional changes by high-throughput RNA sequencing. RESULTS: Comparing the transcriptomes, we found a high degree of similarity in differential gene expression in replicative as well...
Tipo: Journal article
Palavras-chave: Senescence Fibroblasts &amp;#947; -irradiation Aging Transcriptome analysis DNA repair.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100034

Consideraciones Anatómicas en la Parotidectomía: Revisión de la Literatura a Propósito de un Caso
Provedor de dados: 77
Autores: Velasco,Ignacio; Salinas,Felipe; Aguilar,Leonardo; Gallego,Alejandra; Pastrián,Juan; Fariña,Rodrigo; Soto,Reinaldo; Mebus,Cristina; Zurbuchen,Alejandro.
La parotidectomía es un procedimiento quirúrgico habitualmente realizado por Cirujanos Maxilofaciales y Cirujanos de Cabeza y Cuello, en el cual se remueve parcialmente o en su totalidad a la glándula parótida. Las indicaciones más comunes para éste procedimiento son las neoplasias de la glándula. Aproximadamente el 80% del total de los tumores de glándulas salivales ocurren en la parótida. De estos, el 75-80% son de naturaleza benigna. Sin embargo, la parotidectomía es un procedimiento sumamente complejo debido a la anatomía regional y por la íntima relación de la glándula parótida con el nervio facial. Siendo la clave de este procedimiento la preservación funcional de éste nervio y de sus ramos. Por lo tanto el conocimiento acabado de la anatomía de la...
Tipo: Journal article
Palavras-chave: Glándula parótida; Región parotídea; Parotidectomía; Nervio facial; Tumor de Warthin.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100038

Consideraciones Anatómicas sobre la Irrigación de la Flexura Cólica Derecha
Provedor de dados: 77
Autores: Gusmão,Luiz Carlos Buarque de; Rodrigues,Celio Fernando de  Souza; Silva,Ligia Maria Teixeira Pereira da; Pontes Filho,Marco Antonio Gonçalves; Porciúncula Júnior,Wellington Rodrigues.
El estudio tuvo por objetivo describir la irrigación de la flexura cólica derecha, con la finalidad de proporcionar conocimientos anatómicos más amplios respecto del tema, y que éstos puedan ser utilizados para mejorar la práctica quirúrgica. Fueron utilizadas 40 piezas anatómicas de abdomen de cadáveres humanos, de ambos sexos y diferentes edades, fijados en formaldehido al 10%, pertenecientes al Departamento de Morfología de la Universidad Federal de Alagoas, Brasil. Se observó que la flexura cólica derecha estaba irrigada: en la mayoría de los casos (42,5%) por la arcada anastomótica, formada por la rama ascendente de la arteria cólica derecha con la rama derecha de la arteria cólica media; en el 27,5% de los casos por la anastomosis entre la rama...
Tipo: Journal article
Palavras-chave: Irrigación del abdomen; Abdomen; Cirugía abdominal; Flexura cólica derecha.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200029

CONSIDERACIONES ANATÓMICAS SOBRE LA MUSCULATURA INTRÍNSECA DEL MIEMBRO TORÁCICO DEL PUMA (Puma concolor)
Provedor de dados: 77
Autores: Concha,Ismael; Adaro,Luis; Borroni,Cintya; Altamirano,Cecilia.
Se describen los músculos del miembro torácico del puma (Puma concolor). Con este objetivo se hizo una disección en dos pumas adultos,donados por el Servicio Agrícola y Ganadero (SAG) a la Universidad Santo Tomás y por el Parque Zoológico Metropolitano a la Universidad de Chile. Los cadáveres fueron conservados mediante métodos anatómicos tradicionales, realizándosela disección muscular de los miembros torácicos. Nuestras observaciones mostraron que los músculos presentes son los mismos que los descritos para otros felinos como el gato doméstico, siendo el grado de desarrollo que alcanza cada músculo, el parámetro de variabilidad entre ambas especies. Se destaca, además, la presencia del músculo flexor digital superficial, que en textos clásicos es llamado...
Tipo: Journal article
Palavras-chave: Carnívoros; Felinos; Puma; Miología.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000200004

Consideraciones Anátomo-Clínicas sobre el Nervio Radial en el Codo
Provedor de dados: 77
Autores: Bertone,Vicente Hugo; Ottone,Nicolás Ernesto; Lo Tártaro,Maximiliano Ariel; García de Quirós,Nicolás; Arrotea,Agustín; Domínguez,Mario; Finkelstein,Diana; López Bonardi,Paolo; Shinzato,Sergio; Medan,Carlos.
El recorrido del nervio radial a través del codo constituye, para este elemento nervioso, un camino con riesgo de lesiones intrínsecas o extrínsecas. Cambios de la morfología de las estructuras osteomusculares que constituyen el desfiladero del nervio radial, tanto patológicos como traumáticos, pueden determinar el atrapamiento y compresión del mismo, determinando el daño del nervio y/o la inflamación localizada a nivel de las estructuras circundantes. Mediante la disección de 30 preparados, formolizados al 10%, y el análisis subsecuente de la disposición de las estructuras musculares e inserción de las mismas, se determinaron los posibles puntos de riesgo anatómico que pudiesen alterar al nervio radial o a sus ramos en la canal bicipital lateral o en su...
Tipo: Journal article
Palavras-chave: Nervio radial; Atrapamiento; Arcada de Frohse; Nervio interóseo antebraquial posterior.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200032

Consideraciones Anatomo-Quirúrgicas del Ligamento Reflejo
Provedor de dados: 77
Autores: Algieri,Rubén Daniel; Pro,Eduardo; Ferrante,María Soledad; Ugartemendía,Juan Sebastián; Bernadou,Maria de las Mercedes.
La anatomía de la región inguinal está bien descrita y detallada en la literatura, pero existen algunas controversias vinculadas al ligamento reflejo y a su inserción medial. El objetivo fue analizar la inserción del ligamento inguinal reflejo del músculo oblicuo externo en la línea alba, mediante lo observado en disecciones cadavéricas. Se utilizaron 30 cadáveres formolizados, en los que el ligamento reflejo fue disecado hasta su inserción en la línea alba. Se encontró la presencia del ligamento inguinal reflejo en 25 (83,33%) casos, 16 (64%) hombres y 9 (36%) mujeres, de los cuales sólo en 2 (8%) casos se observó la inserción interdigitada del ligamento inguinal reflejo con el contralateral; y en 5 (16,67%) casos (3 mujeres y 2 hombres), se constató...
Tipo: Journal article
Palavras-chave: Ligamento inguinal reflejo; Región inguinal; Músculo oblicuo externo; Línea alba.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400028

Consideraciones sobre la sistemática de las familias y los géneros de plantas vasculares endémicos de Chile
Provedor de dados: 73
Autores: URBINA-CASANOVA,RAFAEL; SALDIVIA,PATRICIO; SCHERSON,ROSA A.
El endemismo es uno de los principales aspectos que trata la biogeografía histórica y es uno de los criterios más importantes para establecer las prioridades de conservación de las especies. En el mundo, más del 90% de las plantas que se encuentra en alguna categoría de amenaza son endémicas de un sólo país. En Chile, un 45% de las especies de plantas vasculares son endémicas. Actualmente este número incluye 83 géneros y 4 familias endémicas del país; éstos son valores elevados en comparación con el resto de Latinoamérica. Sin embargo, la alta tasa de cambios producidos por los estudios de sistemática molecular en la taxonomía ha generado modificaciones en estos números. Este trabajo pretende discutir dichas modificaciones y así contribuir a la correcta...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200011

Consideraciones taxonómicas y de distribución geográfica de especies chilenas del género Tropaeolum L.: T. reicheanum Buchenau ex Reiche; T. looseri Sparre; T. leptophyllum G. Don y T. myriophyllum (Poepp. &amp;amp; Endl.) Sparre
Provedor de dados: 73
Autores: Muñoz-Schick,Mélica; Moreira-Muñoz,Andrés.
Se exponen antecedentes para la revalidación de Tropaeolum reicheanum Buchenau ex Reiche, para la ampliación del rango de distribución geográfica de T. looseri Sparre; sobre la sinonimización de las subespecies de T. leptophyllum G. Don, y aportes al conocimiento y distribución geográfica de T. myriophyllum (Poepp. &amp;amp; Endl.) Sparre
Tipo: Journal article
Palavras-chave: Taxonomía; Distribución geográfica; Tropaeolum; Chile.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200012

Consolidated briefing of biochemical ethanol production from lignocellulosic biomass
Provedor de dados: 69
Autores: Spyridon,Achinas; Willem Euverink,Gerrit Jan.
Bioethanol production is one pathway for crude oil reduction and environmental compliance. Bioethanol can be used as fuel with significant characteristics like high octane number, low cetane number and high heat of vaporization. Its main drawbacks are the corrosiveness, low flame luminosity, lower vapor pressure, miscibility with water, and toxicity to ecosystems. One crucial problem with bioethanol fuel is the availability of raw materials. The supply of feedstocks for bioethanol production can vary season to season and depends on geographic locations. Lignocellulosic biomass, such as forest-based woody materials, agricultural residues and municipal waste, is prominent feedstock for bioethanol cause of its high availability and low cost, even though the...
Tipo: Journal article
Palavras-chave: Bioconversion; Bioethanol; Fermentation; Hydrolysis; Renewable fuels.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500009

Constructed wetlands for domestic wastewater treatment in a Mediterranean climate region in Chile
Provedor de dados: 69
Autores: Mancilla Villalobos,Rodrigo; Zúñiga,Jimena; Salgado,Eduardo; Schiappacasse,Maria Cristina; Chamy Maggi,Rolando.
Background: Constructed wetlands are a promising, cheap and effective wastewater treatment in small communities. The studies on these systems have been reported mainly from cold, tropical or subtropical climate regions. In this work we constructed a pilot plant with six horizontal subsurface flow constructed wetlands (HSSF CWs) with a surface area of 2 m² and a depth of 0.6 m each, planted with Typha latifolia or Scirpus sp., and filled with gravel (G) or fine gravel (FG) of 2.8 and 1.2 cm of diameter respectively, continuously fed with raw domestic wastewater. This experimental setup was evaluated over 280 days for the removal of organic matter and nutrients in a Mediterranean climate, near Valparaíso, Chile. The removal of total COD, NH4+-N and PO4-3-P...
Tipo: Journal article
Palavras-chave: Constructed wetlands; Domestic wastewater treatment; Horizontal subsurface flow system; Mediterranean climate.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400005

Construction and application of a built-in dual luciferase reporter for microRNA functional analysis
Provedor de dados: 69
Autores: Bi,Yanzhen; Zheng,Xinmin; Shao,Changwei; Pan,Wen; Jiang,Li; Ouyang,Huiwu.
Background: As key gene regulators, microRNAs post-transcriptionally modulate gene expression via binding to partially complementary sequence in the 3? UTR of target mRNA. An accurate, rapid and quantitative tool for sensing and validation of miRNA targets is of crucial significance to decipher the functional implications of miRNAs in cellular pathways. Results: Taking advantage of an improved restriction-free cloning method, we engineered a novel built-in dual luciferase reporter plasmid where Firefly and Renilla luciferase genes were assembled in a single plasmid named ?pFila?. This design eliminates the transfection of a separate control plasmid and thus minimizes the time and labor required for miRNA-target sensing assays. pFila consistently produces...
Tipo: Journal article
Palavras-chave: Biosensor; Luciferase; Ligase-independent; MiRNA; Target.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200011

Construction and expression of two-copy engineered yeast of feruloyl esterase
Provedor de dados: 69
Autores: Zhou,Min; Huang,Zhiqing; Zhou,Bo; Luo,Yanliu; Jia,Gang; Liu,Guangmang; Zhao,Hua; Chen,Xiaoling.
Background Aspergillus niger has the ability to secrete feruloyl esterase. However, for economically viable industrial applications, it is necessary to increase their catalytic activities and/or protein yields to satisfy the increasing needs for feruloyl esterases. Results The gene AnFaeA that encodes a type A feruloyl esterase was successfully expressed in Pichia pastoris by a two-copy engineered yeast. After a screen in shaker flask, a one-copy strain GSKFA3 having the highest feruloyl esterase activity of 2.4 U/mL was obtained. Then, the pPICZaA-AnFaeA plasmid was transformed into GSKFA3 and the transformants were grown on YPDS plates with antibiotic Zeocin. After cultivation, a two-copy strain GSKZaFA20 with the highest feruloyl esterase activity of...
Tipo: Journal article
Palavras-chave: Aspergillus niger; Feruloyl esterase; Pichia pastoris.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500002

Construction of a eukaryotic expression vector for pEGFP-FST and its biological activity in duck myoblasts
Provedor de dados: 69
Autores: Li,Xinxin; Wang,Jiwen; Liu,Hehe; Wang,Haohan; Sun,Lingli; Yang,Chao; Li,Liang; Zheng,Yi.
Background Follistatin (FST), a secreted glycoprotein, is intrinsically linked to muscle hypertrophy. To explore the function of duck FST in myoblast proliferation and differentiation, the pEGFP-FST eukaryotic expression vector was constructed and identified. The biological activities of this vector were analyzed by transfecting pEGFP-FST into cultured duck myoblasts using Lipofectamine™ 2000 and subsequently determining the mRNA expression profiles of FST and myostatin (MSTN). Results The duck pEGFP-FST vector was successfully constructed and was confirmed to have high liposome-mediated transfection efficiency in duck myoblasts. Additionally, myoblasts transfected with pEGFP-FST had a higher biological activity. Significantly, the overexpression of FST in...
Tipo: Journal article
Palavras-chave: Follistatin; Muscle hypertrophy; Overexpression; Transfection efficiency.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500006

Construction of a molecular identification profile of new varieties of Nierembergia linariaefolia by anchored microsatellites
Provedor de dados: 69
Autores: Pérez de la Torre,Mariana C.; Escandón,Alejandro S.
The objective of the present work was to establish the molecular identification profile for six new varieties of Nierembergia linariaefolia to incorporate the fingerprint, as complementary information to the standard registration data. Total DNA was extracted from young leaves following the protocol of the cetyltrimethylammonium bromide. Anchored microsatellites were used as molecular markers. The amplification reactions were carried out with seven primers. A total of 251 loci were detected, 98% of them were polymorphic. The average of polymorphic loci was 35 loci per primer and, 41 loci per genotype. Six out of the seven primers used discriminated all the individuals involved in the present study; consequently, it was possible to generate the molecular...
Tipo: Journal article
Palavras-chave: ISSR; Ornamentals; Varietal identification.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300014

Construction of an engineered alpha 1-antitrypsin with inhibitory activity based on theoretical studies
Provedor de dados: 69
Autores: Sangachini,Elham Dasi; Hasannia,Sadegh; Taghdir,Majid; Pirooznia,Nazanin; Ghadicholaei,Kamran Khalili.
Background: The elastase inhibitor &amp;#945;-1-antitrypsin (AAT), is a member of the serpin superfamily of protease inhibitors. AAT has a characteristic secondary structure of three-&amp;#946;-sheets, nine-&amp;#945;-helices and a reactive central loop (RCL). This protein inhibits target proteases by forming a stable complex in which the cleaved RCL is inserted into &amp;#946;-sheet-A of the serpin, leading to a conformational change in the AAT protein. Spontaneous polymerization and instability of AAT are challenges with regard to producing drugs against AAT-deficient diseases. Therefore, the purpose of many investigations currently is to produce drugs with lower degrees of polymerization and higher stabilities. In order to investigate the effect of the...
Tipo: Journal article
Palavras-chave: Alpha1-antitrypsin; Molecular dynamic simulation; Pichia pastoris.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200008

Construction of an immunotoxin by linking a monoclonal antibody against the human epidermal growth factor receptor and a hemolytic toxin
Provedor de dados: 48
Autores: AVILA,ANA D; CALDERÓN,CARLOS F; PEREZ,RITA M; PONS,CARMEN; PEREDA,CELIA M; ORTIZ,ANA R.
Hybrid molecules obtained through conjugation of monoclonal antibodies and toxins constitute an approach under exploration to generate potential agents for the treatment of cancer and other diseases. A frequently employed toxic component in the construction of such immunotoxins is ricin, a plant toxin which inhibits protein synthesis at ribosomal level and so requires to be internalized by the cell. A hemolytic toxin isolated from the sea anemone Stichodactyla helianthus, which is active at the cell membrane level, was linked through a disulfide bond to the anti-epidermal growth factor receptor monoclonal antibody ior egf/r3. The resulting immunotoxin did not exhibit hemolytic activity except under reducing conditions. It was toxic for H125 cells that...
Tipo: Journal article
Palavras-chave: Epidermal growth factor; Epidermal growth factor receptor; Hemolytic toxins; Immunotoxins; Monoclonal antibodies.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000200008

Construction of recombinant Bacillus subtilis strains for efficient pimelic acid synthesis
Provedor de dados: 69
Autores: Zhang,Wei-Wei; Yang,Ming-Ming; Li,Heng-xin; Wang,Dun.
As a precursor, pimelic acid plays an important role in biotin biosynthesis pathway of Bacillus subtilis. Fermentations supplemented with pimelic acid could improve the production of biotin, however, with a disadvantage-high cost. So it is necessary to improve the biosynthesis of pimelic acid via genetic engineering in B. subtilis. In this study, we constructed a recombinant B. subtilis strain for improving the synthesis of pimelic acid, in which a maltose-inducible Pglv promoter was inserted into the upstream of the cistron bioI-orf2-orf3 and, meanwhile, flanked by the tandem cistrons via a single crossover event. The copy number of the integrant was amplified by high-concentration resistance screen and increased to 4-5 copies. The production of pimelic...
Tipo: Journal article
Palavras-chave: Bacillus subtilis; Biosynthesis; Integration; Pglv promoter; Pimelic acid; Single crossover event.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600001

Constructivist Pedagogic Method Used in the Teaching of Human Anatomy
Provedor de dados: 77
Autores: Mota,Mariana Flavia; Mata,Fabiana Ribeiro da; Aversi-Ferreira,Tales Alexandre.
This study aimed to demonstrate that the learning in the discipline of human anatomy is more significant with the use of a constructivist pedagogic methodology in relation to traditional teaching, enabling students to the effective construction of knowledge. Practical lessons in human anatomy were given for students from first semesters of the Physical Education course, Federal University of Goiás, using a constructivist methodology for the teaching of the Digestive System. The students were divided into 5 groups containing 7 students each. Each group used the class guide prepared by teachers, containing the structures to be studied, in addition to textbook and Anatomy Atlas. The data were analyzed using the Graph pad prism software (version 5.00) and...
Tipo: Journal article
Palavras-chave: Human anatomy; Teaching-learning; Anatomy teaching; Constructivist bases.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200005

Construyendo una Red Chilena para Estudios Socioecológicos a Largo Plazo: Avances, enfoques y relevancia
Provedor de dados: 97
Autores: ANDERSON,CHRISTOPHER B; ROZZI,RICARDO; ARMESTO,JUAN J; GUTIÉRREZ,JULIO R.
Desde su inicio formal en 1980, los programas de investigación ecológica a largo plazo (LTER por su sigla en inglés) han servido como un exitoso marco organizacional para crear agendas de investigación y mecanismos de financiamiento que permiten a los científicos abordar fenómenos ecológicos significativos a las escalas en que ellos ocurren. En sus 30 años de existencia, LTER ha expandido su rango geográfico (actualmente la red Internacional de LTER tiene más de 40 países miembros con sitios de estudios en cada uno de los continentes) y focos disciplinarios (principalmente abarcando las ciencias naturales y sociales, llevando a algunos a pedir un cambio de nombre a estudios de investigación socioecológica de largo plazo - LTSER por su sigla en inglés). No...
Tipo: Journal article
Palavras-chave: LTER; LTSER; Subantártico; Sudamérica; Templado.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000100001

Consumer Perception of Animal Welfare and Livestock Production in the Araucania Region , Chile
Provedor de dados: 117
Autores: Schnettler M,Berta; Vidal M,Ricardo; Silva F,Roberto; Vallejos C,Lisette; Sepúlveda B,Néstor.
Given the importance of animal welfare (AW) in developed countries, a survey was carried out among 384 consumers in Temuco, Chile, to establish their knowledge and perceptions about animals handling during production, to detect preferences for meat produced under AW principles, their willingness to pay a higher price for this and to distinguish different consumer segments. Approximately 60% of people surveyed knew about livestock management practices, half of them considered that these practices had a negative effect on the animals, but only 32.1% have changed their meat consumption habits due to this. Seventy percent of the people surveyed had over 50% of knowledge about AW aspects. There is a strong preference and willingness to pay a higher price for...
Tipo: Journal article
Palavras-chave: Animal welfare; Market segmentation; Cluster analysis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100008

Consumer Preference and Willingness to Pay for an Officially Certified Quality Label: Implications for Traditional Food Producers
Provedor de dados: 113
Autores: Padilla,Carlos; Villalobos,Pablo; Spiller,Achim; Henry,Guy.
A study was carried out in Chile in order to evaluate consumer preference and willingness to pay for a certified quality label on traditional food products, employing a conjoint analysis method. A total of 234 individuals were interviewed in two Chilean cities, Santiago and Talca. A homemade blackberry (Rubus ulmifolius) marmalade and three product attributes with their respective levels were chosen (price, quality label and jar appearance). Nine hypothetical product concepts were generated applying an orthogonal design. Respondents were asked to rank the product concepts according to their preferences. The results obtained through the conjoint model suggest that an “officially certified quality label” is the most important attribute influencing consumer...
Tipo: Journal article
Palavras-chave: Quality attributes; Certified quality label; Product differentiation; Conjoint analysis.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000300009

Consumer preferences and willingness to pay for organic apples
Provedor de dados: 118
Autores: Cerda,Arcadio A; García,Leidy Y; Ortega-Farías,Samuel; Ubilla,Álvaro M.
This study provides marketing data regarding consumer preferences and willingness to pay for organic agricultural products in Chile. The main objectives of this study were to assess consumer willingness to pay for organic apples and to determine the main attributes that consumers look for when purchasing apples. The methodology applied to reach the first objective was the contingent valuation method using a logistic probability function and a single-bound dichotomous choice format. Additionally, this study estimates the marginal willingness to pay (WTP) of consumers for organic apples by using conjoint analysis with ranking procedures. This study was performed in the city of Talca, Chile, where a total of 400 individuals from a probability sampling were...
Tipo: Journal article
Palavras-chave: Apple attributes; Conjoint analysis; Contingent valuation; Willingness to pay.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100004

Consumer responses to agricultural produce advertising in the O'Higgins Region of Chile
Provedor de dados: 118
Autores: Adasme-Berríos,Cristian; Jara-Rojas,Roberto; Ramos-Cabello,Bárbara; Rodríguez,Marcelo; Mora,Marcos.
The main objective of this article was to analyze consumer responses to agricultural produce advertising. A survey was given to a non-probabilistic sample of 400 consumers in Rancagua, the capital city of the O'Higgins Region. A principal components analysis (PCA) was performed to identify the main factors influencing the consumption of agricultural produce and recognized four factors that influence the consumption of agricultural products: influence of advertising, impact of produce advertising, consumption of vegetables, and advertising preference. Additionally, the market segments that respond to agricultural produce advertising were identified using decision-tree methodology (CHAID). The results show that education is the most important segmenting...
Tipo: Journal article
Palavras-chave: Agricultural produce; CHAID; Consumer behavior; Principal components analysis.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100003

Contaminant Fate, Dynamics and Bioavailability: Biochemical and Molecular Mechanism at the Soil: Root interface
Provedor de dados: 127
Autores: Naidu,R; Kim,K.R.
Tipo: Journal article
Palavras-chave: Environmental contamination; Contaminant bioavailabihty; Root; Soil interface.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000400010

Contemporary Staining of Arterial System with Cadaver Fixation: An Experimental Study
Provedor de dados: 77
Autores: Ghorbani,Rostam; Tavakol,Zahra; Ghanbari,Ali.
Although many methods are investigated, cadavers have unique role for education of gross anatomy. This study was performed to make cadaveric based gross anatomy more enjoyable and decrease the time needed for achievement of arterial system for teachers and learners. The adult rabbits in control (n=3) and experimental groups (n=9) sacrificed following deep anesthesia. The samples were fixed by injection of fixative solution to the left ventricle and the corps dropped to the traditional fixative liquid for at least 1 month. The injected fixative solution of experimental group contained stained human red blood cells. The red blood cells stained by eosin (0.25% in saline) for 30 minutes and injected between two injections of fixative. After passing the period...
Tipo: Journal article
Palavras-chave: Artery; Cadaver; Eosin; Packed cells; Staining.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300052

CONTENIDO DE ADN NUCLEAR EN GALAXIAS PLATEI (STEÍNDACUNER, 1898) (TELEOSTEI: OSMERIFORMES: GALAXIIDAE)
Provedor de dados: 72
Autores: Jara-Seguel,Pedro; Valdebenito,Iván; Palma-Rojas,Claudio.
Galaxias platei, es un pez endémico de Chile y cubre una extensa área geográfica desde la zona centro-sur hasta gran parte de la Patagonia (38°S-54°S), incluyendo también parte de Argentina. En este trabajo se determinó el contenido somático de ADN nuclear (valor 2C) de Galaxias platei (Galaxiidae) mediante microdensitometría nuclear de eritrocitos sometidos a tinción de Feulgen. El valor 2C de G platei es 1,88+0,16 pg y su valor C es equivalente a 0,94 pg (921,2 pMb). El valor C de G platei está dentro del rango descrito para otras especies de Osmeriformes (valores entre 0,62 y 3,2 pg) y es menor al valor documentado previamente para G maculatus (C = 1,105 pg). Estos datos contribuyen a incrementar los antecedentes genómicos disponibles para el género...
Tipo: Journal article
Palavras-chave: Osmeriformes; Galaxiidae; Galaxias platei; Valor 2C.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200009

CONTENIDO DE FLAVONOLES EN UVAS PARA VINO CULTIVADAS EN EL VALLE DE CASABLANCA, CHILE
Provedor de dados: 113
Autores: Ciudad B.,Claudio; Valenzuela B.,Jorge.
Los antioxidantes en vegetales y sus subproductos están tomando día a día mayor relevancia, dada la influencia detrimental sobre el estrés oxidativo y las dolencias que de él derivan, como enfermedades cardiovasculares y cáncer. El vino, especialmente el tinto, contiene flavonoles, y aún más, recientemente la literatura extranjera ha dado a conocer los altos niveles comparativos que posee el vino chileno. En consecuencia, interesa tipificar y evaluar el potencial productivo varietal de los flavonoles: quercetina y miricetina en la uva chilena, los cuales pasan al mosto durante la vinificación de las variedades tintas. Para cumplir este objetivo, en el valle de Casablanca, durante la vendimia de año 1999, se recolectaron muestras de uvas para vino en...
Tipo: Journal article
Palavras-chave: Quercetina; Miricetina; Vino; Estrés oxidativo.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100008

Contenido de metales (Ba, Cd, Co, Cr, Cu, Ni, Pb y Zn) en organismos bentónicos de áreas prístinas: Campos de hielo sur (48°- 52° lat. Sur), Chile
Provedor de dados: 72
Autores: AHUMADA BERMÚDEZ,RAMÓN; AHUMADA-RUDOLPH,RAMÓN; GONZÁLEZ SEPULVEDA,ELIZABETH.
Se analizó el contenido de metales totales en organismos bentónicos recolectados en Campos de Hielo Sur, con el objeto de establecer patrones de abundancia de metales en los organismos y concentración de referencia de metales (línea base) en una zona de aguas prístinas. Se estudiaron seis especies 5 moluscos bivalvos y un erizo. Los análisis se realizaron utilizando un espectrómetro de emisión atómica acoplado a plasma (ICP-AES). Se estableció un ranking de abundancia de metales para los analitos y fue similar para las diferentes especies: Zn &gt; Ba &gt; Cu &gt; Co &gt; Cd &gt; Cr &gt; Ni &gt; Pb e independiente de los valores de concentración de cada metal en particular. Se estableció por comparación que la concentración de metales informada fue...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200002

Contenido de metales en muestras biológicas de la isla Rocuant, bahía Concepción, Chile
Provedor de dados: 72
Autores: Werlinger I.,Camilo; Salamanca O.,Marco.
RESUMEN Se analiza la presencia de metales pesados en tejidos de organismos provenientes del sector aledaño a Isla Rocuant, Bahía Concepción. Los organismos estudiados fueron los bivalvos bentónicos Tagelus dombeii (&amp;#8220;navajuela&amp;#8221;), Mulinia edulis (&amp;#8220;taquilla&amp;#8221;), las macroalgas Gracilaria chilensis (&amp;#8220;pelillo&amp;#8221;) y Rhodymenia sp (&amp;#8220;rodymenia&amp;#8221;) y el pez Stromateus stellatus (&amp;#8220;pampanito&amp;#8221;). Los metales analizados en sus tejidos fueron Cd, Fe, Hg, Pb y Zn para los cuales no existen registros previos en la localidad. La obtención de las muestras fue realizada por medio de buceo &amp;#8220;hooka&amp;#8221; para los organismos bentónicos, mientras que los peces fueron...
Tipo: Journal article
Palavras-chave: Bentos; Macroalgas; Metales pesados; Organismos marinos; Peces.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382017000100017

Contenido de nutrientes e inoculación con hongos ectomicorrízicos comestibles en dos pinos neotropicales
Provedor de dados: 97
Autores: CARRASCO-HERNÁNDEZ,VIOLETA; PÉREZ-MORENO,JESÚS; ESPINOSA-HERNÁNDEZ,VICENTE; ALMARAZ-SUÁREZ,JUAN J; QUINTERO-LIZAOLA,ROBERTO; TORRES AQUINO,MARGARITA.
Un alto porcentaje de mortalidad se presenta en plántulas de pinos que son trasplantados de vivero a campo, debido a que no poseen hongos ectomicorrízicos los cuales forman simbiosis obligada con las plantas de forma natural en los bosques. Estos hongos facilitan la absorción de nutrientes y agua, además de estimular su crecimiento. Debido a la importancia ecológica y fisiológica de los hongos ectomicorrízicos, el presente trabajo evaluó el efecto en crecimiento, peso seco, porcentaje de colonización y contenido de nutrientes de la inoculación de seis especies ectomicorrízicas comestibles de los géneros Lacearía y Hebeloma en Pinus patula Schiede ex Schltdl. &amp;amp; Cham. y P. pseudostrobus Lindl., en condiciones de invernadero. Después de 397 días de la...
Tipo: Journal article
Palavras-chave: Inóculo; Ectomicorriza; N; P; Pinus.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100006

CONTENIDO ESTOMACAL DE CHEILODACTYLUS VARIEGATUS VALENCIENNES 1833, PINGUIPES CHILENSIS VALENCIENNES 1833 Y PROLATILUS JUGULARIS VALENCIENNES 1833 EN BAHIA DE LA HERRADURA, COQUIMBO, DURANTE PRIMAVERA DEL 2001
Provedor de dados: 72
Autores: Moreno,Mabel; Flores,Héctor.
Se estudió el contenido estomacal de tres especies de peces importantes en la pesquería artesanal y que están presentes en Bahía La Herradura de Coquimbo: Cheilodactylus variegatus, Pinguipes chilensis y Prolatilus jugularis. Durante octubre y noviembre del 2001 se capturaron 20 ejemplares por especie, determinándose la frecuencia numérica (FN), volumétrica (FV) y de ocurrencia (FO) para cada uno de los ítem-presa encontrados. Esta información fue analizada mediante el IIR y para determinar la existencia de sobreposición de nicho alimentario se empleó el índice de Morisita. Se observó que Ch. variegatus y P. chilensis presentan una alimentación preferentemente basada en crustáceos como Rhynchocinetes typus y que P. jugularis se alimenta principalmente de...
Tipo: Journal article
Palavras-chave: Indice de Morisita; Ítem-presa; Nicho alimenticio.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200017

Contenidos de Anatomía en Diseños de Aprendizaje Dispuestos en LAMS e Integrado a Moodle
Provedor de dados: 77
Autores: Bucarey A,Sandra; Araya A,Erick; Cabezas O,Ximena; Álvarez G,Luis.
Este trabajo trata la experiencia del uso de LAMS en procesos de aprendizaje e-learning para el área de la salud. Se trabajó con contenidos de anatomía del hígado humano, siguiendo estándares educativos y metodologías necesarias para crear Diseños de Aprendizaje (LD) y recursos educativos de calidad e interoperables. El Instituto de Anatomía, Histología y Patología fue responsable del diseño e implementación de Objetos de Aprendizaje (OAs) en anatomía de hígado (con Macromedia flash), mientras el Instituto de Informática se encargó de abordar la gestión y proceso del recurso pedagógico, integrando un especialista (LAMS y Moodle) para el diseño y gestión de aprendizaje. LAMS fue usado para crear actividades de aprendizaje basado en LD integrado a Moodle,...
Tipo: Journal article
Palavras-chave: Diseños de Aprendizaje; Objetos de Aprendizaje; Anatomía humana; LAMS; Moodle.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200009

CONTEOS CROMOSOMICOS EN PHILESIA MAGELLANICA J.F.GMEL. (LILIALES: PHILESIACEAE)
Provedor de dados: 73
Autores: Jara-Seguel,Pedro; Fuentes-Ramírez,Andrés.
Mitotic chromosome counts documented here for Philesia magellanica J.F.Gmel. (Philesiaceae) showed a diploid number 2n = 30 (x = 15), which is different to the numbers reported previously for the species. The 2n number of P. magellanica is similar to that documented previously for Lapageria rosea, which indicate a constancy of chromosome number within the family
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200010

Continuous citric acid secretion by a high specific pH dependent active transport system in yeast Candida oleophila ATCC 20177
Provedor de dados: 69
Autores: Anastassiadis,Savas; Rehm,Hans-Jürgen.
The pH influence on continuous citric acid secretion was investigated in Candida oleophila ATCC 20177 (var.) under NH4+ limiting state steady conditions, using glucose. Highest citric acid concentration of 57.8 g/l, citrate/isocitrate ratio of 15.6, space-time yield of 0.96 g/(l x hr) and biomass specific productivity of 0.041 g/(g x hr) were obtained at pH 5 and 60 hrs residence time. Only 22.8 g/l (39.4%) and a ratio of 9.9 were achieved at pH 6 pH and 12.4 g/l (21.5%) and a ratio of 3.7 at pH 3. Under non producing conditions, in excess of nitrogen, biomass concentration increased at raising pH. An iron concentration of 200 ppm was determined in biomass of C. oleophila at pH 5, compared with only 26 ppm found at pH 3 (factor 7.7). Intra- and...
Tipo: Journal article
Palavras-chave: Active citrate export; Citric acid fermentation; Energy consuming citric acid secretion; Specific active transport system.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200004

Continuous gluconic acid production by Aureobasidium pullulans with and without biomass retention
Provedor de dados: 69
Autores: Anastassiadis,Savas; Rehm,Hans-Jürgen.
New alternative processes for the continuous production of gluconic acid by Aureobasidium pullulans, using biomass retention by cell immobilization or cross over filtration, are described in the present work. 315 g/l gluconic acid was continuously produced in chemostat cultures at 21 hrs residence time without any biomass retention. 260 g/l gluconic acid was produced in fluidized bed reactor at 21 hrs residence time. The support carrier was overgrown resulting in limitations of oxygen transfer towards the inner layers of immobilized biomass. 375 g/l gluconic acid was produced under continuous cultivation at 22 hrs of residence time with a formation rate for the generic product of 17 g/(l x h) and a specific gluconic acid productivity of only 0.74 g/(g x...
Tipo: Journal article
Palavras-chave: Biomass immobilization; Continuous fermentation; Cross over filtration; Gluconic acid fermentation; Reaction technique; Residence time.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500004

Continuous Stabilization of Chardonnay with Ion-Exchage Resin: Influence on Protein and Phenolic Profile of Wine
Provedor de dados: 117
Autores: de Bruijn,Johannes; Valdebenito,Ana; Loyola,Cristina; Serra,Ignacio; Salazar,Fernando; López,Francisco.
Unstable proteins may react with polyphenols, forming haze and precipitation in white wines. Therefore, the adsorption of these wine proteins is an essential step in the production of white wines. The objective of this study was to determine the influence of adsorption of these proteins on the stability, and protein and phenolic composition of a Chardonnay wine. In this work, protein stabilization of Chardonnay wine was done by continuous adsorption using a packed bed with a SP-Trisacryl-M adsorbent (Sigma-Aldrich). A more pronounced breakthrough of proteins and turbidity causing compounds was found after treating 65 bed volumes of wine by the resin. An increased retention of the protein fraction of 20-50 kDa during the first 62 bed volumes of treated wine...
Tipo: Journal article
Palavras-chave: Adsorption; Trisacryl; Fining; Chile.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100007

Contribución al conocimiento de la flora vascular de la Reserva Biológica Huilo Huilo, Región de Los Ríos, Chile
Provedor de dados: 73
Autores: Teillier,Sebastián; Macaya-Berti,Jorge; Bonnemaison,Catherinne; Marticorena,Alicia.
Las áreas protegidas estatales juegan un papel decisivo en la conservación de la naturaleza; marco en que las reservas privadas son aliadas importantes, pues mejoran su representatividad y aumentan su superficie. La Reserva Biológica Huilo Huilo se encuentra en la ecorregión de los bosques templados del sur de Sudamérica e incluye diversos tipos de bosques de Nothofagus y vegetación andina. Se ubica en la Región de Los Ríos, localidad de Neltume (39°51'S-71°57'W) entre 500 y 2.000 m altitud. Los resultados corresponden al estudio de un cuadrante de ca. 11 x 20 km. La riqueza de la flora vascular alcanza a 406 especies, que se distribuyen en 95 familias y 230 géneros. Las familias con más especies son: Asteraceae, con 60 (14,8% del total); Poaceae, con 43...
Tipo: Journal article
Palavras-chave: Flora de Chile; Flora de la Región de Los Ríos; Reserva Biológica Huilo Huilo; Primula comberi.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200003

CONTRIBUCION AL CONOCIMIENTO DE LOS PHTHIRAPTERA (ANOPLURA, Hoplopleura) PARASITOS DE ROEDORES EN CHILE
Provedor de dados: 72
Autores: González-Acuña,Daniel; del C. Castro,Dolores; Moreno-Salas,Lucila.
Se cita por primera vez a Hoplopleura travassosi Werneck 1932 como asimismo su hospedero, Oligoryzomys longicaudatus (Bennett 1832) para Chile. Además, se amplía la distribución de Hoplopleura andina Castro 1981 sobre Akodon olivaceus Waterhouse, 1835, desde la VIII hasta la V Región de Chile. El estatus de las especies neotropicales del género Hoplopleura y su distribución geográfica actual es discutido
Tipo: Journal article
Palavras-chave: Hoplopleura andina; Hoplopleura travassosi; Phthiraptera; Roedores; Nueva cita; Distribución; Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100014

CONTRIBUCIÓN DE LAS NORMAS CIOMS 2002 AL DESARROLLO BIOTECNOLÓGICO: LA CORRESPONSABILIZACIÓN DEL CIENTÍFICO
Provedor de dados: 48
Autores: BOTA ARQUÉ,ALEXANDRE.
La revolución biotecnológica afronta grandes retos, entre ellos la participación social, la bioseguridad y la protección tanto del germoplasma como del conocimiento ancestral que de él se derivan. Para afrontar estos dilemas se plantea la necesidad de buscar una corresponsabilización de todos los actores del desarrollo biotecnológico. En este artículo se realiza un correlato partiendo de la reflexión ya iniciada por la comunidad médica con sus pautas éticas internacionales para la investigación biomédica en seres humanos, CIOMS, versus la biotecnología para buscar una corresponsabilización de los tecnocientíficos, biotecnólogos en sus investigaciones con la pretensión utópica de buscar un desarrollo biotecnológico mas respetuoso con el hombre y con su...
Tipo: Journal article
Palavras-chave: Bioética; Biotecnología; Empoderamiento.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000200005

Contribución del epifitismo accidental a la distribución de especies de plantas vasculares en un bosque templado lluvioso
Provedor de dados: 73
Autores: Guzmán-Marín,Rosario; Saldaña,Alfredo.
ABSTRACT In a Valdivian forest stand, we identified vascular plant species occurring as accidental epiphytes, and we determined the contribution of accidental epiphytism on their local abundance. Four species were found as accidental epiphytes, being the fern Blechnum mochaenum the species showing the higher abundance proportion as accidental epiphyte (40 %). Unexpectedly, individuals of this species occurring as accidental epiphytes did not differ in functional traits related to nutrient availability (LMA-leaf mass ratio- and leaf C/N ratio) from those that usually occur on the forest ground. As a shade tolerant and slow growing species, B. mochaenum apparently is not affected by the environmental restrictions of the epiphytic habitat.
Tipo: Journal article
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100226

Contribución Proximal del Nervio Ulnar para la Formación del Nervio Digital Palmar Propio Ulnar del Dedo Mínimo
Provedor de dados: 77
Autores: Pacheco,J. P; Olave,E.
La anatomía de la mano presenta padrones generales en la distribución de los nervios responsables de la inervación motora y sensitiva. Sin embargo, se encuentran variaciones que son de interés para la anatomía quirúrgica de la región. En una serie de 20 manos disecadas, en 19 (95%)observamos que el nervio digital palmar propio del lado ulnar del dedo mínimo correspondía a un ramo directo del nervio ulnar y en el caso restante (5%), de un cadáver de sexo femenino, se observó un ramo de origen antebraquial que participó en la formación del nervio digital palmar propio ulnar del dedo mínimo. Este ramo se originó desde el tronco del nervio ulnar, distal al origen del ramo dorsal de este nervio y proximal al hueso pisiforme. En su trayecto pasó a través del...
Tipo: Journal article
Palavras-chave: Anatomía; Mano; Nervio ulnar; Nervio digital palmar propio ulnar del dedo mínimo.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400033

Contribuciones de Wilhelm His a la Embriología Humana
Provedor de dados: 77
Autores: Godoy-Guzmán,C.
Wilhelm His (1831-1904) gran anatomista y embriólogo suizo, profesor de la cátedra de anatomía de la Universidad de Basilea y Universidad de Leipzig. His, realizó el primer intento de estudiar los distintos estadios del embrión humano en su totalidad. Para tal fin, introdujo importantes avances tecnológicos que permitieron una comprensión más detallada del embrión humano, marcando un hito en el desarrollo de la embriología como ciencia. En este trabajo se resumen las principales contribuciones de Wilhelm His en el campo de la embriología humana. Uno de sus principales aportes fue la invención del micrótomo en 1866, el cual permitió reconstruir el embrión a partir de secciones histológicas. Otro de sus grandes inventos fue el denominado embriógrafo,...
Tipo: Journal article
Palavras-chave: Wilhelm His; Embriología humana; Historia.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100010

Contribution of dendritic cell/T cell interactions to triggering and maintaining autoimmunity
Provedor de dados: 48
Autores: Llanos,Carolina; Carreño,Leandro J; Kalergis,Alexis M.
Under healthy conditions, there is a balance between tolerance to self-tissue constituents and immunity against foreign antigens. Autoimmunity diseases (AD) take place when that equilibrium is disrupted and the immune response is directed to self-antigens, leading to injury or destruction of host tissues. The mechanisms conducing to the loss of immune tolerance remain largely unknown. The recent appearance of biological therapies has contributed to significant reduction in morbidity. However, currently available therapies are associated with important side effects and work only as palliative treatments. Dendritic cells (DCs) have emerged as key players in developing and maintaining adaptive immunity due to their capacity to prime and modulate T cell...
Tipo: Journal article
Palavras-chave: Dendritic cells; T cells; Immunological synapse; Autoimmunity; Tolerance.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100007

Contribution of environmental pollutants to male infertily: A working model of germ cell apoptosis induced by plasticizers
Provedor de dados: 48
Autores: Lagos-Cabré,Raúl; Moreno,Ricardo D.
Bisphenol A [2,2-bis(4-hydroxyphenyl)propane] (BPA), 4-nonylphenol (NP) and di(2-ethylhexyl)phthalate (DEHP), and its metabolite mono-2-ethylhexyl phthalate (MEHP) are chemicals found in plastics, which act as endocrine disruptors (EDs) in animals, including human. EDs act like hormones in the endocrine system, and disrupt the physiologic function of endogenous hormones. Most people are exposed to different endocrine disruptors and concern has been raised about their true effect on reproductive organs. In the testis, they seem to preferentially attack developing testis during puberty rather than adult organs. However, the lack of information about the molecular mechanism, and the apparently controversial effect observed in different models has hampered the...
Tipo: Journal article
Palavras-chave: Testis; Spermatogenesis; Bisphenol A; Nonylphenol; ADAM17.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000100001

Contribution to the Study of Aortic Mural Structure of Opossum (Didelphis albiventris)
Provedor de dados: 77
Autores: Martins,Márcia Regina Fernandes Boaro; Pinto e Silva,José Ricardo de Carvalho; Martins,Bruna Boaro.
Opossum is considered one of the most primitive mammals, with transition evolutive characteristics. In mammals, the aorta artery is referred as the main body blood vessel. The arteries wall structural organization follows a basic pattern, being contituted of three tunics: Intima, Median and Adventicial. After euthanasia, three samples of opossum had segments from the aorta artery ascendent, thoracic descending and abdominal descending portions removed, fixed in phormalin at 10% for 48 hours. Then, the material was washed in alcohol 70% several times, dehydrated in alcohois of growing concentrations, diafanized in xylol and included in "paraplast". Cuts with 5 to 7µm of thickness were placed in histological laminae and submitted to color methods of...
Tipo: Journal article
Palavras-chave: Aorta; Opossum.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100041

Contribution Towards the Anatomy of the Esophageal Hiatus and its Relationship with the Presence of Bundles of Collagen Fibers in its Margins
Provedor de dados: 77
Autores: Filho,José Jeová de Oliveira; Filho,Benedito Herani; Reis,Francisco Prado; Feitosa,Vera Lúcia Correa; Aragão,José Aderval.
The aim was to detect the presence of bundles of collagen fibers in the margins of the esophageal hiatus and establish if there is any relationship of these bundles with the anatomy of the hiatus. Ten adult male cadavers, with no gross anatomical alteration caused by trauma, surgery or disease, upon the esophageal hiatus were used in the study. A piece of anatomical structure comprising the diaphragm with the esophageal hiatus and adjacent tissues was removed, dissected and 10% formol embedding. With the aid of a digital caliper, measurements of the perimeter of the esophageal hiatus were done both in the abdominal and thoracic sides. For the structural study each margin was divided in six sections. Staining techniques of Masson and Picrosirius-hematoxilin...
Tipo: Journal article
Palavras-chave: Diaphragm; Esophagogastric Junction; Collagen; Cadaver; Humans.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300015

Contributions by researchers of "Ciencia de Frontera" of the Chilean Academy of Sciences
Provedor de dados: 48
Autores: GONZALEZ-BILLAUL,CHRISTIAN; INESTROSA,NIBALDO C; SANTOS,MANUEL J.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100001

CONTROL BIOLOGICO DE Ulex europaeus L.: INTERNACION A CHILE DE DOS POBLACIONES DEL BIOAGENTE Agonopterix ulicetella (Stainton) (Lepidoptera: Oecophoridae)
Provedor de dados: 113
Autores: Norambuena M.,Hernán; Escobar S.,Sergio; Rodríguez A.,Fernando.
Durante 1996 y 1997, se colectaron en Hilo, Hawaii, EEUU, y en Plymouth, Inglaterra, dos poblaciones del insecto Agonopterix ulicetella, un herbívoro específico de la maleza agrícola y forestal Ulex europaeus (espinillo). La selección de los bioagentes se realizó teniendo en cuenta los criterios señalados por varios investigadores de control biológico de malezas. Posterior a la introducción de dichas poblaciones a Chile, se les sometió a las etapas de cuarentena, confirmación de especificidad y crianza en laboratorio, protocolos esenciales para desarrollar el método de control biológico clásico. Ambas poblaciones sobrevivieron el transporte, el cambio de hemisferio y la cuarentena. Asimismo, se obtuvieron nuevas generaciones de laboratorio de las...
Tipo: Journal article
Palavras-chave: Control biológico de malezas; Bioagentes; Insectos benéficos; Herbívoros específicos.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100009

CONTROL DE BABOSAS (Deroceras reticulatum Müller) CON Phasmarhabditis hermaphrodita Schneider (NEMATODA: RHABDITIDAE) EN SUELOS CON SISTEMA DE CERO LABRANZA
Provedor de dados: 113
Autores: France,Andrés; Gerding,Marcos; Céspedes,Cecilia; Cortez,Mónica.
Se evaluó el efecto del nemátodo Phasmarhabditis hermaphrodita (Schneider) en el control de babosas (Deroceras reticulatum Müller) en condiciones de laboratorio y campo. El nemátodo fue introducido desde Inglaterra. Luego de la cuarentena, P. hermaphrodita fue inoculado en D. reticulatum y evaluado diariamente por síntomas y mortalidad. En laboratorio el nemátodo causó la mortalidad de la totalidad de las poblaciones de babosas a los 20 días de postinoculación, produciendo una notoria disminución del apetito desde los primeros días de la inoculación. En terreno, los experimentos se realizaron en campos de cero labranza, con una población de babosas que superó los 100 ejemplares m-2. Las siembras de lupino (Lupinus albus L.) tratadas con nemátodos tuvieron...
Tipo: Journal article
Palavras-chave: Babosas terrestres; Nemátodos; Control biológico; Lupino; Maíz.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000200001

Control de Oxalis latifolia: Revisión y propuestas para su mejoramiento
Provedor de dados: 118
Autores: Royo-Esnal,Aritz; López,María Luisa.
Oxalis latifolia es una mala hierba de distribución tropical, templada y mediterránea que infesta cultivos hortícolas, viveros, jardines y cultivos de maíz. A pesar de que algunos métodos mecánico-culturales y numerosos herbicidas contribuyen a un aceptable e incluso excelente control, su aplicación muchas veces es difícil y cara. Sin embargo, O. latifolia presenta determinadas características biológicas en su ciclo anual que la hacen más o menos vulnerable. Por ello se hace necesario estudiar combinaciones adecuadas de los métodos de control, como los arados, retrasos en la siembra o uso de cubiertas con los diferentes herbicidas, tanto residuales como foliares, siempre teniendo en cuenta sus particularidades biológicas, para cada tipo de cultivo en cada...
Tipo: Journal article
Palavras-chave: Control cultural; Control químico; Escarda; Herbicidas; Oxalis latifolia.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200002

Control of Botrytis cinerea in Eucalyptus globulus Mini-Cuttings Using Clonostachys and Trichoderma Strains
Provedor de dados: 117
Autores: Zaldúa,Salomé; Sanfuentes,Eugenio.
Botrytis cinerea Pers. ex Fr. causes the disease known as gray mold in more than 200 hosts. It is one of the most important pathogens in Chilean forest nurseries and Eucalyptus globulus Labill. is one of the most susceptible species, especially in vegetative reproduction systems. Clonostachys and Trichoderma strains were selected as potential biocontrol agents of gray mold in previous research by the authors. The objective of this study was to evaluate the effectiveness of antagonistic fungi to control B. cinerea in E. globulus mini-cuttings. Five fungi strains were tested and applied weekly, two Clonostachys and three Trichoderma (5 x 10(6) conidia mL-1). In addition, comparison treatments were also used: absolute control (water) and fungicide...
Tipo: Journal article
Palavras-chave: Biocontrol agents; Forest nurseries; Eucalyptus; Gray mold; Antagonistic fungi.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000400007

Control of Cladosporium echinulatum in carnation using bicarbonates and Trichoderma
Provedor de dados: 118
Autores: Sandoval,Claudio; Terreros,Valeria; Schiappacasse,Flavia.
Carnations, Dianthus caryophyllus, have been cultivated in Chile for several decades as a cut flower crop. At the present time, floriculture occupies 2,124 ha, of which 180 ha are devoted to carnations. Almost all carnations produced are sold in the domestic market. Several diseases affect carnations, among them fairyring leaf spot (Cladosporium echinulatum), the most important foliar disease in Chile. Different control alternatives for fairy-ring spot were evaluated on the carnation cv. Sarinah in terms of disease incidence and severity. The study was performed in June-August 2003 with a commercial carnation planting in a greenhouse located in Champa(33° 49' S, 70° 45' W) that in previous growing seasons reported a high incidence of fairyring leaf spot....
Tipo: Journal article
Palavras-chave: Carnation; Cladosporium; Dianthus caryophyllus; Foliar diseases; Sodium bicarbonate; Trichoderma.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300015

Control of dual isoforms of Ca2+ release channels in muscle
Provedor de dados: 48
Autores: RÍOS,EDUARDO; ZHOU,JINGSONG.
Here we compare excitation-contraction coupling in single muscle cells of frogs and rats. Because amphibians have isoform 3 (or b) of the ryanodine receptor/Ca2+ release channel, in addition to 1 (a), which is also present in the mammal, any extra feature present in the frog may in principle be attributed to isoform 3. Ca2+ release under voltage clamp depolarization has a peak and a steady phase in both taxonomic classes, but the peak is more marked in the frog, where the ratio of amplitudes of the two phases is voltage-dependent. This dependence is a hallmark of CICR. Confocal imaging identified Ca2+ sparks in the frog, but not in the voltage-clamped rat cells. Because Ca2+ sparks involve CICR both observations indicate that the contribution of CICR is...
Tipo: Journal article
Palavras-chave: Excitation-contraction coupling; Sarcoplasmic reticulum; Ca2+ sparks; Ryanodine receptor; Calcium-induced calcium release.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400012

Control of plant-parasitic nematodes using cover crops in table grape cultivation in Chile
Provedor de dados: 118
Autores: Baginsky,Cecilia; Contreras,Américo; Covarrubias,José Ignacio; Seguel,Oscar; Aballay,Erwin.
C. Baginsky, A. Contreras, J.I. Covarrubias, O. Seguel, and E. Aballay. 2013. Control of plant-parasitic nematodes using cover crops in table grape cultivation in Chile Cien. Inv. Agr. 40(3): 547-557. A study to evaluate the effect of a three-year rotation with cover crops for the management of plant-parasitic nematodes (PPNs) was performed in two vineyards producing table grapes (Vitis vinifera L.) in a semiarid region in the north of Chile. In the first vineyard, located in Copiapó valley (trial I), the crops used in the rotations or monoculture were fava bean (Vicia faba) cv. Aguadulce, rape (Brassica napus var. napus) cv L-456, forage turnip (B. rapa var. rapa) cv. Barkant, barley (Hordeum vulgare) cv. Aurora, oat (Avena sativa) cv. Urano-INIA, and...
Tipo: Journal article
Palavras-chave: Vitis vinifera; Crop protection; Nematicidal plants; Botanical nematicides.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000300008

Control of potato early blight with triazole fungicide using preventive and curative spraying, or a forecasting system
Provedor de dados: 118
Autores: Mantecón,Jorge D.
During the 2005 and 2006 growing seasons, two field trials were conducted at the INTA Balcarce Experimental Station (Argentina) to study the control of potato early blight (Alternaria solani). Uncut virus-free seed tubers of potato (Solanum tuberosum) cv. Pampeana PNTA that were susceptible to early blight and resistant to late blight were machine planted in 0.20-m intervals in rows spaced 0.8 mapart. Each plot consisted of 4 rows that were 5 meters long. Difenoconazole (Bogard 25EC) was sprayed weekly at a rate of 0.25 L· ha-1 or bi-weekly at a rate of 0.50 L· ha-1 on a preventive program and on a curative program. The same treatments and rates were also applied when the forecast model (Specware 6.02) reached 300 P-Days after emergence, and applications...
Tipo: Journal article
Palavras-chave: Alternaria solani; Argentina; Disease control; Early blight; Potato; Prediction model; Solanum tuberosum.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000200013

Control of San Jose Scale Nymphs, Diaspidiotus perniciosus (Comstock), on Almond and Apple Orchards with Pyriproxyfen, Phenoxycarb, Chlorpyrifos, and Mineral Oil
Provedor de dados: 117
Autores: Sazo,Luis; Araya,Jaime E; Esparza,Sergio.
The effect of pyriproxyfen, phenoxycarb, chlorpyrifos, and mineral oil in the control of first generation nymphs of the San Jose scale (SJC), Diaspidiotus perniciosus (Comstock), in almond, Prunusdulcis (Mill.) D.A. Webb, and apple, Malusdomestica Borkh. orchards was studied in the 2001-2002 season in central Chile. One and two sprays of pyriproxyfen 0.07% and phenoxycarb 0.05% were applied, the first at the beginning of the appearance of nymphs in early spring (biofix), and the other 15 days later, and were compared with one spray of chlorpyrifos 0.08% applied at the biofix. Also, one and two sprays of mineral oil 1% were evaluated, the first applied 7 days after the biofix, and the second 15 days after the first spray. Evaluations were done in the...
Tipo: Journal article
Palavras-chave: Mineral oil; Phenoxycarb; Pyriproxyfen; San Jose scale.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300008

Controladores del Tiempo y el Envejecimiento: Núcleo Supraquiasmático y Glándula Pineal
Provedor de dados: 77
Autores: Guadarrama-Ortiz,Parménides; Ramírez-Aguilar,Ricardo; Madrid-Sánchez,Alejandro; Castillo-Rangel,Carlos; Carrasco-Alcántara,Diana; Aguilar-Roblero,Raúl.
El núcleo supraquiasmático (NSQ) es el principal reloj biológico de los mamíferos y sincroniza la actividad de la glándula pineal al ciclo luz-oscuridad a través de una vía polisináptica. El efecto de asa de retroalimentación neuroendocrina se lleva a cabo por la melatonina. El presente trabajo pretende demostrar que la glándula pineal modula la sensibilidad a la luz en el NSQ. Se utilizaron ratas Wistar, y se asignaron a 3 grupos: grupo A (falsa pinealectomía -sham-, sin luz), grupo B (falsa pinealectomía -sham- + luz) y grupo C al cual se le realizó la pinealectomía + luz, después de la manipulación se sacrifican para realizar inmunohistoquímica para c-Fos y al final conteo celular por técnica de estereología. Se obtuvo una reducción del 46,8% del...
Tipo: Journal article
Palavras-chave: Pinealectomía; C-Fos; Falsa pinealectomía; Núcleo supraquiasmático.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200004

Controlled release formulations of herbicides based on micro-encapsulation
Provedor de dados: 118
Autores: Sopeña,Fátima; Maqueda,Celia; Morillo,Esmeralda.
Annual worldwide losses to weeds are estimated to comprise approximately 10-15% of attainable production among principal food sources. Worldwide consumption of herbicides represents 47.5% of the 2 million tons of pesticide consumed each year. However, the heavy use of herbicides has given rise to serious environmental and public health problems. It is therefore important to develop new herbicide formulations that are highly effective, that are safer (for the worker and for the environment), and that involve a low cost/production ratio. In this sense, Controlled release formulations of herbicides have become necessary in recent years, since they often increase herbicide efficacy at reduced doses. The present work reviews in detall the components of various...
Tipo: Journal article
Palavras-chave: Adjuvant; Contamination; Control; Delivery system; Formulations; Herbicide; Micro-encapsulation; Weed control.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000100002

Controlled Rhizogenesis and Mycorrhization of Hazelnut (Corylus avellana L.) Cuttings with Black Truffle (Tuber melanosporum Vitt.)
Provedor de dados: 117
Autores: Santelices,Rómulo; Palfner,Götz.
Hazelnut (Corylus avellana L.) is commonly used as mycorrhizal host for Tuber melanosporum Vitt. (black truffle). Black truffle orchards have been established in and outside its natural distribution area, currently also in Chile. Hazelnut can be propagated rapidly by cuttings, which, however, may not easily form mycorrhizal symbiosis under laboratory conditions. We successfully inoculated hazelnut cuttings with T. melanosporum and studied the effects of culture conditions, plant material and inoculum age on rhizogenesis and mycorrhization. Cuttings from sucker shoots showed the highest rooting rate (88.5%). Perlite and vermiculite as substrate increased root length (9.6 cm ). Treatment with auxin significantly increased root yield (up to 27 roots per...
Tipo: Journal article
Palavras-chave: Cuttings; Rhizogenesis; Mycorrhizae; Culture conditions.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200003

Controlling proteolytic degradation of the methionine enriched MB-1Trp protein
Provedor de dados: 69
Autores: Sasseville,Maxime; St-Louis,Catherine; Khoudi,Habib; Beauregard,Marc.
Protein design is currently used for the creation of new proteins with desirable traits, which include a superior nutritional value. One of the challenges of protein design in this area is to achieve the production of stable native-like proteins that resist the proteolytic pressure of the organism used for its production (the bioreactor). We report here the identification of a specific peptide bond sensitive to E. coli proteolysis in the designer protein MB-1Trp. In an attempt to reduce proteolysis, we have created a MB-1TrpHis gene library in which the two amino acids surrounding the peptide bond, N44 and L45, were randomized using degenerated oligonucleotides. The initial characterization of MB-1TrpHis N44E/L45V and MB-1TrpHis N44E/L45M, 2 variants of...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300004

Conus Medullaris Position in an Adult Population: Analysis of Magnetic Resonance Imaging
Provedor de dados: 77
Autores: Karabulut,Ozlen; Akay,Hatice; Karabulut,Zulfu; Özevren,Hüseyin; Saka,Gunay; Hatipoglu,Savas; Deveci,Engin.
The objective of this study was to evaluate the variation in position of the conus medullaris (CM) in male and female patients without spinal deformity, to correlate the termination level in magnetic resonance (MR) images of the lumbar spine. 921 patients consisted of 607 men and 314 women were evaluated by MRI. The strength of T1 weighted MRI device was 1.5 Tesla. The patients were in supine position when measured. The termination level of the conus medullaris was recorded in relation to the upper, middle or lower third of the adjacent vertebra and the adjacent intervertebral disc. The patients in our study group were examined for low back pain. The members with spinal deformity were excluded. The distribution of conus medullaris localization was measured...
Tipo: Journal article
Palavras-chave: Conus medullaris; MRI.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400029

Convenient genotyping of nine bovine K-casein variants
Provedor de dados: 69
Autores: Pacheco Contreras,Víctor I; Lourenco Jaramillo,Diana L; Parra Bracamonte,Gaspar M; Martínez González,Juan C; Sifuentes Rincón,Ana M.
K-casein gene polymorphisms are of major importance in the dairy industry due to their association with different quality and productive traits (i.e., milk protein). Several methods for genotyping this gene have been proposed; however, none are focused on the simultaneous discrimination of nine K-casein variants. A strategy based on PCR-RFLP was designed to characterize nine K-casein variants (A, B, C, E, F², G, H, I and J) and used to genotype three cattle populations: Gyrholando (3/8 Gyr x 5/8 Holstein), Charolais and Carora. The B variant was the most frequent in the Charolais and Carora breeds, with allelic frequencies of 0.60 and 0.59, respectively. In the Gyrholando breed, four variants were found, with the A variant being the most frequent and E and...
Tipo: Journal article
Palavras-chave: Milk proteins; Milk quality; Protein genes.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400012

Cooperation and bacterial pathogenicity: an approach to social evolution
Provedor de dados: 97
Autores: Alfonso Molina,C; Vilchez,Susana.
Kin selection could provide an explanation for social behavior in bacteria. The production of public goods such as extracellular molecules is metabolically costly for bacteria but could help them to exploit nutrients or invade a host. Some bacterial cells called social cheaters do not produce public goods; however, they take advantage of these extracellular molecules. In this review, the relationships between social behavior, cooperation, and evolution of bacterial pathogenicity are analyzed. This paper also examines the role of horizontal transfer of genes encoding for virulence factors and how the movement of mobile genetic elements would influence the pathogenicity and social relationships. Moreover, the link between ecological relationships and...
Tipo: Journal article
Palavras-chave: Cooperation; Evolution; Pathogenicity; Public goods.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100013

Co-operative effect of glutathione depletion and selenium induced oxidative stress on API and NFkB expression in testicular cells in vitro: insights to regulation of spermatogenesis
Provedor de dados: 48
Autores: SHALINI,SONIA; BANSAL,MOHINDER P.
Previous studies have shown that transcription factors, API and NFkB exert important roles in the process by which selenium regulates spermatogenesis. Glutathione, an intracellular thiol, acts as a source of reducing power and aids in maintenance of the cellular redox status. The activities of selenium are closely related to the availability of glutathione. Presently, mouse testicular cells were cultured in the presence of BSO, a known glutathione depletor, to generate oxidative stress. Selenium (Se) was added as sodium selenite to these cells at concentrations of 0.5 µM and 1.5 µM. It was observed that at 1.5 µM, Se acted as a pro-oxidant and significantly decreased the redox ratio. RT PCR analysis revealed that cjun, cfos expression increased in...
Tipo: Journal article
Palavras-chave: API; BSO; GSH; NFkB; Oxidative stress; Selenium; Testicular cells.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000400005

COPD in Non-smoking Elderly Men at Sea Level and High Altitude: Comparing Anthropometric Characteristics and Physiological Responses
Provedor de dados: 77
Autores: Moreno,Angel; Espinoza-Navarro,Omar.
The World Health Organization considers cigarette smoke as a major risk factor and causal agent of chronic obstructive pulmonary disease (COPD); however, smoke from biomass in poorly ventilated environments may be the major causative agent in developing countries. There is little epidemiological evidence of COPD in relation to the use of biomass fuels and altitude of the place of residence, and there is no record of the morphological and physiological characteristics of patients with COPD living at different altitudes. The objective of this research was to compare a) morphological characteristics: weight, height and body mass index (BMI) and b) physiological responses: spirometric record, heart rate, oxygen saturation and hemoglobin concentration in a...
Tipo: Journal article
Palavras-chave: COPD; Altitude; Anthropometry; Elderly men; Chile.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200044

Cop-like operon: Structure and organization in species of the Lactobacillale order
Provedor de dados: 48
Autores: REYES,ANGÉLICA; LEIVA,ANDREA; CAMBIAZO,VERÓNICA; MÉNDEZ,MARCO A; GONZÁLEZ,MAURICIO.
Copper is an essential and toxic trace metal for bacteria and, therefore, must be tightly regulated in the cell. Enterococcus hirae is a broadly studied model for copper homeostasis. The intracellular copper levels in E. hirae are regulated by the cop operon, which is formed by four genes: copA and copB that encode ATPases for influx and efflux of copper, respectively; copZ that encodes a copper chaperone; and copY, a copper responsive repressor. Since the complete genome sequence for E. hirae is not available, it is possible that other genes may encode proteins involved in copper homeostasis. Here, we identified a cop-like operon in nine species of Lactobacillale order with a known genome sequence. All of them always encoded a CopY-like repressor and a...
Tipo: Journal article
Palavras-chave: Cop operon; CopY binding site; Copper homeostasis; Enterococcus hirae; Lactobacillale order.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100010

Copolymerization of lignin with cresol catalysed by peroxidase in reversed micellar systems
Provedor de dados: 69
Autores: Liu,Junhong; Ye,Lin; Weiping,Yuan.
Peroxidase catalysed copolymerization of lignin with cresol in a reversed micellar system was performed successfully. The molecular weight of the copolymer was controlled by adjusting the surfactant concentration and a maximal mean molecular weight of 1890 kDa was obtained.
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000200004

Copper distribution in leaves and roots of plants growing on a copper mine-tailing storage facility in northern Chile
Provedor de dados: 97
Autores: ORTIZ-CALDERÓN,CLAUDIA; ALCAIDE,ÓSCAR; LI KAO,JULIA.
In a copper mine-tailing afforested we characterized the physicochemical properties of the substrate at vegetated and non-vegetated patches. We studied the accumulation of copper in roots and leaves of the species present at the site, to evaluate their phytoextraction and/or phytostabilization potential. The non-vegetated mine-tailing substrate showed a high contení of metals, mainly copper (&gt; 2.5 g kg-1), a pH 7.4, high contení of salts and 5.0 % organic matler. Vegelaled palches al íhe lailing showed similar characlerislics of pH, salís and organic maller conlenl, and showed a lolal copper concenlralion lower íhan íhe conlenl found ai íhe non-vegelaled patches. Nine plant species present at the site were screened for copper accumulation and...
Tipo: Journal article
Palavras-chave: Copper; Phytoextraction; Phytostabilisation; Remediation; Native plants.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400004

Copper removal from aqueous solution by marine green alga Ulva reticulata
Provedor de dados: 69
Autores: Vijayaraghavan,Kuppusamy; Raj Jegan,Joseph; Palanivelu,Kandasamy; Velan,Manickam.
The batch removal of copper (II) ions from aqueous solution under different experimental conditions using Ulva reticulata was investigated in this study. The copper (II) uptake was dependent on initial pH and initial copper concentration, with pH 5.5 being the optimum value. The equilibrium data were fitted using Langmuir and Freundlich isotherm model, with the maximum copper (II) uptake of 74.63 mg/g determined at a pH of 5.5. The Freundlich model regression resulted in high correlation coefficients and the model parameters were largely dependent on initial solution pH. At various initial copper (II) concentrations (250 to 1000 mg/L), sorption equilibrium was attained between 30 and 120 min. The copper (II) uptake by U. reticulata was best described by...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100009

Copper-induced adaptation, oxidative stress and its tolerance in Aspergillus niger UCP1261
Provedor de dados: 69
Autores: Cavalcanti Luna,Marcos A; Rodrigues Vieira,Edson; Okada,Kaoru; Campos-Takaki,Galba Maria; do Nascimento,Aline Elesbão.
Background The effects of exposure to copper, during growth, on the production of biomass, total protein, catalase, glutathione-S transferase, glutathione peroxidase, peroxidase, polyphosphate, acid and alkaline phosphatases, ultrastructure and the ability to remove this metal from Aspergillus niger, obtained from caatinga soil, were evaluated. Results All parameters tested were influenced by the concentration of metal in the culture medium. The presence of metal induced high levels of antioxidant enzymes, including lipid peroxidation, thereby revealing the appearance of an oxidative stress response. The variation in polyphosphate levels indicates the participation of the polymer in response to stress induced by copper. The activities of the phosphatases...
Tipo: Journal article
Palavras-chave: Aspergillus niger; Antioxidant enzyme; Copper removal; Polyphosphate; Ultrastructure.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600006

Coracoclavicular and Costoclavicular Joints at a Common Juncture: A Rare Phenomenon
Provedor de dados: 77
Autores: Rani,Anita; Mishra,Suniti R; Chopra,Jyoti; Rani,Archana; Manik,Punita; Kumar,Navneet; Dewan,R. K.
Movements at the human shoulder girdle are the result of complex interplay of glenohumeral, acromioclavicular, sternoclavicular and scapulothoracic articulations. Clavicle apart from articulating with the scapula and sternum is also connected with first rib by costoclavicular ligament and with coracoid process by coracoclavicular ligament. At times the area of attachment of these ligaments on clavicle, first rib and scapula show faceted apophysis suggesting the presence of additional diarthrodial articulations. Costoclavicular joint exists between clavicle and first rib and coracoclavicular joint between clavicle and coracoids process. Both these joints are described in the literature, but the concurrent occurrence of them in the same bone has not been...
Tipo: Journal article
Palavras-chave: Clavicle; Scapula; First rib; Costoclavicular ligament; Costoclavicular joint; Coracoclavicular ligament; Coracoclavicular joint.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400022

CORAL INIA, CULTIVAR DE AVENA PARA PRODUCCIÓN DE FORRAJE EN ARGENTINA
Provedor de dados: 113
Autores: Beratto M.,Edmundo; Rivas P.,Rudy.
Coral INIA es un cultivar de avena (Avena sativa L.) de hábito alternativo creado para producción de forraje en Argentina, obtenido a partir de una población segregante F3 proveniente del vivero de la Quaker Oat 1991, correspondiente a la entrada 184, identificada como QR 856 y origen 90WI3125-28. Se incorporó a ensayos de rendimiento desde 1995 a 1997, en el Centro Regional de Investigación (CRI) Carillanca, ubicado en Temuco, Chile, dependiente del Instituto de Investigaciones Agropecuarias (INIA). En Argentina fue evaluada en 1998 y 1999, para producción de forraje verde en Luján, Provincia de Buenos Aires, y para reacción a enfermedades en Luján y Chacabuco, Provincia de Buenos Aires, y Maciel, Provincia de Santa Fe, por la empresa Trigen Seed Services...
Tipo: Journal article
Palavras-chave: Avena sativa L.; Avena alternativa; Enfermedad.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000200012

Cordelia's Dilemma, Historical Bias, and General Evolutionary Trends: Catfishes as a Case Study for General Discussions on Phylogeny and Macroevolution
Provedor de dados: 77
Autores: Diogo,Rui.
As noted Gould in his recent and last book «The structure of evolutionary theory», discourses on the high importance and frequency of evolutionary trends have consumed a great part of the research on the history of clades. Although aware that natural selection theoretically yields adaptation to immediate environments, many authors defend such trends as generalised improvements somehow conferring advantages across most or all experienced environments. The high importance given to evolutionary trends is questioned by Gould, who considers that such a high importance given to such evolutionary trends bears no necessary relationship to the relative frequency or casual weight of these events in evolution, but mainly to a major bias: trends tell histories, and...
Tipo: Journal article
Palavras-chave: Evolution; Morphology; Phylogeny; Siluriformes; Teleostei.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500016

Corona Mortis: Importancia Anatomo ­ Clínica y Ocurrencia en una Muestra de la Población Colombiana
Provedor de dados: 77
Autores: Baena,Gloria; Rojas,Sebastián; Peña,Elizabeth.
Corona mortis es una variación anatómica referida a la anastomosis de los vasos iliacos externos e internos, mediante vasos que se arquean por encima y por detrás del ramo superior del pubis. En caso de resultar lesionados iatrogénicamente, se pueden presentar hemorragias de difícil manejo. El objetivo del estudio fue caracterizar los vasos obturatrices en una muestra cadavérica de la población colombiana, para determinar su morfometría y la frecuencia con que se presentan los diferentes patrones venosos y arteriales. Se estudiaron hemipelvis de 14 cadáveres, pertenecientes al anfiteatro del Departamento de Morfología de la Universidad del Valle en Cali, Colombia. Tras acceder a la cavidad pélvica y completar la disección de todos los vasos que se...
Tipo: Journal article
Palavras-chave: Variación anatómica; Enfermedad iatrogénica; Sangrado; Hernia abdominal; Fracturas óseas; Arteria iliaca; Vena iliaca; Arterias epigástricas; Huesos de la pelvis; Pubis.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100021

Coronary Artery Connection: Cone Trunk Sharks Varieties Anatomy Study (Selachians)
Provedor de dados: 77
Autores: Saba,J. C; Prates,J. C.
Due to our interest in clarifying the congenic problems at the origin of the coronary arteries, we have published in the early 70´s a theory (Borges et al., 1974) in which the coronary arteries would be the last pair of aortic arches that, at the beginning of the embryogenesis, would be connected with the previous arch, trunk of the lung's artery through a duct which we named "ductus coronarius".
Tipo: Journal article
Palavras-chave: Selachian; Coronary Arteries.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400038

Coronary Irrigation in Puma concolor (Carnivora: Felidae)
Provedor de dados: 77
Autores: Viotto-Souza,Wilson; Souza Junior,Paulo de; Carvalho,Amarílis Díaz de; Abidu-Figueiredo,Marcelo; Santos,André Luiz Quagliatto.
This study described the anatomy of the coronary arteries and their main branches in Puma concolor. The hearts of six individuals of Puma concolor, were analyzed. The A. coronaria sinistra formed the ramus interventricularis paraconalis and the ramus circunflexus. A ramus septal was formed close to the origin of the ramus interventricularis paraconalis and yielded from six to eight ventricular branches. The circumflex branch originated from two to five atrial branches and from three to seven ventricular branches. The right coronary artery formed two to six atrial branches, and four to nine ventricular branches. In half of the individuals, an accessory coronary artery was identified as the first branch of the right coronary artery. In all individuals, the...
Tipo: Journal article
Palavras-chave: Cardiovascular system; Carnivores; Coronary dominance; Cougar.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300021

Corporal Composition and Characteristics of Carcass of Araucano Creole Lambs
Provedor de dados: 77
Autores: Bravo,Silvana; Fabres,Macarena; Schnettler,Berta; Sepúlveda,Néstor.
Once livestock is slaughtered the carcass of body obtained represents the main commercial product, and is valued in terms of quality. The aim of this work was to characterize and evaluate the carcasses of Araucano creole lambs. Thirteen Araucano lambs were slaughtered at 221±15 days of age weighing 32±2 Kg. The hot carcass was weighed and after 24 hours at 4C the cold carcass was weighed. The characteristics of conformation, fat cover and regional composition of the carcass were evaluated according to Chilean regulation standards. The tissue composition of the back was also determined, in its three components (muscle, bone and fat). The commercial yield of the carcass was 51.14% and losses due to dehydration of the carcass were recorded at 3%. The...
Tipo: Journal article
Palavras-chave: Ovines; Chile; Carcass measurements.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400020

Corpus Callosum Size, is There a Sexual Difference?
Provedor de dados: 77
Autores: Yasin,Mohammad; Farahani,Reza Mastery.
Physical anthropometry is a subdivision of human anatomy science, which has uses in medical industries. A lot of studies showed that genetic, racial, and socioeconomic factors and educational background play rule in anthropometry. We aim this study to determine the presence of differences between gender and corpus callosum size. MRIs were collected from Ardebil and Kermanshah states done in 2013, the participants were informed about this study. They were selected based on age more than 20-years old, absence of demyelization and degenerative diseases, clean history of for neurosurgery, and previous cerebrovascular accidents. MRIs were analyzed by PmsDview program in the midsagittal section by using 9 landmarks, and the data was analyzed by SPSS 19.0. The...
Tipo: Journal article
Palavras-chave: Corpus callosum; Sex-related size; Sex-related; Anthropometry; Iran; MRI; Sexual dimorphism.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100016

Correlación entre el Puntaje Obtenido en la Prueba "Timed up and go" y Momentos Articulares del Miembro Inferior Registrados Durante la Transferencia de Sedente a Bípedo en Adultos Mayores con Antecedentes de Caídas Frecuentes
Provedor de dados: 77
Autores: Guzmán,R. A; Salazar,H. A; Cea,A; Melián,H. P; Cordier,B; Silvestre,R. A.
Los cambios producidos durante el envejecimiento predisponen al adulto mayor a las caídas frecuentes, en el ambiente clínico el riesgo de caída es valorado mediante pruebas clínicas que muchas veces carecen de poder analítico, por lo cual es necesario describir cual de dichas pruebas puede tener mayor relación con parámetros biomecánicos analíticos con la finalidad de conferirle a dichas pruebas funcionales tales características. El objetivo de este trabajo fue describir la existencia de correlación entre los puntajes obtenidos en la prueba funcional "Timed up and go" (TUG) y momentos articulares del miembro inferior obtenidos durante la ejecución de la transferencia de sedente a bípedo (TSB) en sujetos adultos mayores con antecedentes de caídas...
Tipo: Journal article
Palavras-chave: Caídas; Ancianos; Momento; Biomecánica.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200036

Correlación entre Índice de Masa Corporal y Circunferencia de Cintura en una Muestra de Niños, Adolescentes y Adultos con Discapacidad de Temuco, Chile
Provedor de dados: 77
Autores: Ojeda Nahuelcura,Rodrigo; Cresp Barría,Mauricio.
La obesidad es uno de los problemas de salud pública más importantes, por lo que su detección en forma temprana facilita la aplicación de estrategias preventivas. Según la Organización Mundial de la Salud, el Índice de masa corporal (IMC), es un instrumento válido para determinar el estado nutricional de la población, afirmación no compartida por especialistas del alto rendimiento. Se realiza este estudio para correlacionar el IMC con la circunferencia de cintura (CC), indicador que permite predecir con mayor exactitud la obesidad central o abdominal. El segundo objetivo de esta investigación es describir la prevalencia del sobrepeso y la obesidad en personas con discapacidad. Se evaluó a 188 niños, adolescentes y adultos jóvenes de ambos sexos, 123...
Tipo: Journal article
Palavras-chave: Índice de masa corporal; Circunferencia de cintura; Obesidad; Sobrepeso; Personas con discapacidad; Niños; Adolescentes; Adultos jóvenes.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400043

Correlación entre Índice de Masa Corporal y Sintomatología Depresiva en una Muestra de Niños Preescolares de La Región de Los Ríos, Chile
Provedor de dados: 77
Autores: Cañoles Cañoles,Felipe; Araneda Garcés,Nelson; Silva Mella,Héctor; Sanhueza Campos,Antonio.
El desarrollo epidémico de la obesidad actualmente pone en riesgo a la población mundial, registrándose alarmantes cifras en niños, quienes, dependiendo de la edad en que la padezcan, presentan una probabilidad del 25% al 75% de ser obesos en la adultez. Este problema es especialmente importante en Chile, en donde se tiene la prevalencia más alta a nivel sudamericano. El impacto de la obesidad en la salud emocional ha sido descrito como tanto o más dañino que las comorbilidades médicas asociadas a ésta, estudiándose la asociación entre obesidad y sintomatología depresiva eminentemente desde la edad escolar en adelante. Evaluamos 250 preescolares del sistema público de educación, de la Region de los Ríos. El presente estudio abordó la relación entre...
Tipo: Journal article
Palavras-chave: Depresión; Estabilidad psicológica; Preescolar; Estado Nutricional.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300009

CORRELACIÓN ENTRE WORLD REFERENCE BASE Y SOIL TAXONOMY PARA LOS SUELOS DE LA VII REGIÓN DEL MAULE DE CHILE
Provedor de dados: 127
Autores: Casanova P,Manuel; Luzio L,Walter; Maldonado R,Rodrigo.
Se realizó una correlación entre World Referente Base (WRB) y Soil Taxonomy (ST), para los suelos de la VII Región del Maule de Chile. Once Grupos de Suelos de Referencia definidos por WRB fueron identificados: Lixisols (499.965 ha), Durisols (62.539 ha). Umbrisols (62.387 ha), Phaeozems (52.823 ha), Cambisols (46.982 ha), Andosols (45.645 ha), Regosols (13.701 ha), Fluvisols (6.908 ha), Luvisols (6.132 ha), Planosols (4.606 ha) y Vertisols (640 ha). Estos suelos fueron localizados principalmente en la Depresión Intermedia (Graben Central) de Chile. Los Andosols se describieron hacia la Cordillera de los Andes y los Luxisols principalmente hacia la Cordillera de la Costa. Las correlaciones más estrechas se observaron entre Lixisols y Alfisols, Umbrisols,...
Tipo: Journal article
Palavras-chave: Suelo; Clasificación; Base Mundial de Referencia; Taxonomía de Suelos.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000200002

Correlaciones entre Marcadores de Grasa Abdominal Obtenidos por Densitometría y Técnicas Antropométricas Convencionales en Mujeres Postmenopausicas con Síndrome Metabólico
Provedor de dados: 77
Autores: Rosety-Rodriguez,M; Tejerina,A; Camacho-Molina,A; Rosety,I; Diaz,A. J; Fornieles,G; Rodriguez-Pareja,A; Rosety,M. A; Alvero-Cruz,J. R; Ordonez,F. J.
El presente estudio pretende identificar correlaciones estadísticamente significativas entre parámetros de masa grasa abdominal obtenidos por densitometría (DXA) y otros de tipo cineantropométrico (índices de distribución de masa grasa) y bioquímico (perfil lipídico) en mujeres postmenopausicas con síndrome metabólico. Se diseño un estudio de cohortes histórico que incluyó a un total de 1326 mujeres post-menopausicas con edad &gt; 45 años que se habían sometido rutinariamente a DXA para conocer su densidad mineral ósea entre Enero de 2006 y Enero de 2011. Se utilizó un DXA tipo Lunar DPX-L para determinar la masa grasa abdominal en las regiones de interés L1-L4 y L3-L4. Además del DXA, se obtuvo de cada participante la correspondiente anamnesis,...
Tipo: Journal article
Palavras-chave: Síndrome metabólico; Obesidad abdominal; Postmenopausia; Absorciometría.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400043

Correlaciones Morfológicas entre la Forma de la Cabeza, Dieta y uso de Hábitat de Algunos Sceloporus de México: Un Análisis Cuantitativo
Provedor de dados: 77
Autores: Galindo-Gil,Sandra; Rodríguez-Romero,Felipe de Jesús; Velázquez-Rodríguez,Alma S; Moreno-Barajas,Ruth.
La relación entre los caracteres morfológicos y la ecología de los organismos permite deducir respuestas adaptativas. Estas adaptaciones son el resultado de presiones selectivas que actúan sobre los organismos, así como el tipo de presa que consumen o el ambiente en el que se encuentran. De esta manera, los organismos exhiben morfologías que les permiten explotar los recursos disponibles. Sceloporus es un grupo de lagartijas altamente diverso en Norteamérica además de encontrarse en diversos hábitats, lo que lo hace un modelo óptimo para probar hipótesis adaptativas y evolutivas. El objetivo fue evaluar si existen diferencias morfológicas en la cabeza de algunas especies de Sceloporus y determinar si dicha morfología surge como una respuesta adaptativa al...
Tipo: Journal article
Palavras-chave: Morfología; Cabeza; Adaptación; Sceloporus; Dieta; Uso de Hábitat.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100047

Correlation Between Function-Morphology of Effect of the Stress and Flunitrazepam Administered During Gestation in Adult Mouse Ovary
Provedor de dados: 77
Autores: Aguirre-Samudio,Ana Julia; de la Fuente-Juáre,Graciela; Márquez-Orozco,Amalia; Márquez-Orozco,María Cristina.
Previously we report long lasting effects on ovary of mice prenatally exposed to flunitrazepam (FNZ), a benzodiazepine with tranquilized action. In this work we find that the FNZ don't prevent the effects on ovary prenatally exposure to stress in mice. We studied adult females born from mothers that had been stressed by immobilization on day 6 ofgestation (GD-6) or group S, and from mothers stressed also by immobilization at GD-6, but which received a single oral dose of FNZ immediately after the stress group FNZS. The control groups were the SS that received the GD-6 saline solution and the group NT non-treated. Their ovaries were extracted for histology studies and to observe the activity of 3b hydroxysteroid dehydrogenase/isomerase (3 b-HSD). The...
Tipo: Journal article
Palavras-chave: Benzodiazepine; 3 b-HSD; Flunitrazepam; Mouse; Ovaries; Atretics follicles; Prenatal stress.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100045

Correlation between Innervation of Skeletal Muscles and Myoblast Stem Cells
Provedor de dados: 77
Autores: Wu,Jiang; Sun,Xiaojuan; Zhu,Min; Zhu,Chongtao; Chen,Bin; Xu,Yongqing; Ouyang,Jun; Liao,Hua; Qiu,Xiaozhong.
In order to explore the change rule of myoblast stem cells (satellite cells, SCs) in the denervated and re-innervated muscle and to investigate the cellular mechanism of the morphological and functional changes of the muscle, denervated muscle atrophy and nerve regeneration models were established in one-month-old rats. Postoperative indexes such as muscle wet weight, cell section areas, content of collagen fibers and DNA, electrophysiology, numbers of SCs in the triceps muscle of calf were dynamically tested. After denervation, the muscle wet weight and cell area reduced rapidly, and the collagen fiber content increased slowly. The number of SCs increased at first, and then declined suddenly two months later. From 4 to 5 weeks after re-neuralization,...
Tipo: Journal article
Palavras-chave: Satellite cells; Atrophy; Denervation; Innervations; Stem cells.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400043

Correlation of Skull Size and Brain Volume, with Age, Weight, Height and Body Mass Index of Arak Medical Sciences Students
Provedor de dados: 77
Autores: Bayat,Parvin-Dokht; Ghanbari,Ali; Sohouli,Pardis; Amiri,Sara; Sari-Aslani,Payam.
Anthropometric indices that are indicators of nutrition status in children and adults can be affected by racial and geographic factors. The aim of present study was to investigate the relation of skull size and brain volume of Arak University of Medical Sciences students with their age, weight, height and body mass index. The present study was a cross-sectional study on 18-26 years old students of Arak University of Medical Sciences (150 female and 136 male) in 2009-2010 educational year. Sampling methods were probability and multi-stage methods which were performed using students' educational file and interviewing the subjects. Questions regarding anthropometric data (height, weight, age, body mass index and skull index) were included in the personal...
Tipo: Journal article
Palavras-chave: Anthropometry; Body Mass Index (BMI); Skull Index; Iran.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100028

Correlations of recognition memory performance with expression and methylation of brain-derived neurotrophic factor in rats
Provedor de dados: 48
Autores: Muñoz,Pablo C; Aspé,Mauricio A; Contreras,Luis S; Palacios,Adrián G.
Object recognition memory allows discrimination between novel and familiar objects. This kind of memory consists of two components: recollection, which depends on the hippocampus, and familiarity, which depends on the perirhinal cortex (Pcx). The importance of brain-derived neurotrophic factor (BDNF) for recognition memory has already been recognized. Recent evidence suggests that DNA methylation regulates the expression of BDNF and memory. Behavioral and molecular approaches were used to understand the potential contribution of DNA methylation to recognition memory. To that end, rats were tested for their ability to distinguish novel from familiar objects by using a spontaneous object recognition task. Furthermore, the level of DNA methylation was...
Tipo: Journal article
Palavras-chave: DNA methylation; Recognition memory; Synaptic plasticity; Hippocampal; Perirhinal cortex; BDNF.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000200013

Corrigendum to The effect of high concentrations of glycerol on the growth, metabolism and adaptation capacity of Clostridium butyricum DSP1
Provedor de dados: 69
Autores: Szymanowska-Powalowska,Daria.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500011

Corrosion Casting, a Known Technique for the Study and Teaching of Vascular and Duct Structure in Anatomy
Provedor de dados: 77
Autores: Rueda Esteban,Roberto Javier; López McCormick,Juan Sebastián; Martínez Prieto,Daniel Ricardo; Hernández Restrepo,Juan David.
Teaching and learning anatomy, as a process, has changed. Fresh cadavers were once used as a tool for the student to approach the human body in order to overcome theoretical knowledge and gain applied expertise. Today, techniques such as corrosion casting are known to be a more effective way of achieving optimal results with the students. This paper examines a method to apply this technique to an organ using different polymers. The concentrations for acrylic, epoxy resin, polyester resin, and room temperature vulcanization (RTV) silicone are described, as well as the corresponding diameter of the duct to be injected with each one. A variety of specimens obtained using this technique, their qualities and characteristics are presented. The results of using...
Tipo: Journal article
Palavras-chave: Corrosion Casting; Repletion; Corrosion; Teaching Anatomy; Preservation Techniques.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300053

Cortical and Cancellous Bone in Mandibular Symphysis: Implications in Osteosynthesis and Osteotomy
Provedor de dados: 77
Autores: Velásquez,Humberto; Olate,Sergio; Alister,Juan Pablo; Uribe,Francisca; Haidar,Ziyad S; Fariña,Rodrigo.
The aim of this study was to quantify the presence of cortical and cancellous bone in the mandibular symphysis. A descriptive study was conducted using cone beam computed tomography where skeletal class I and class III subjects were included, defined according to characteristics detected on dental, clinical and dental occlusion x-rays. From the 3D reconstruction, sections were used in relation to the axial axis of the teeth of the anterior sector; the amount of buccal cortical, cortical, lingual, inferior cortical and cancellous bone as well as symphysis height were determined. The measurements were taken using routine methods and analyzed with ANOVA and Tukey's HSD test with p &lt;0.05 for statistical significance. 20 skeletal class I subjects aged 23...
Tipo: Journal article
Palavras-chave: Genioplasty; Mandibular symphysis; Chin.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300051

Costo de Capital para el Sector Vitivinícola Chileno: Una Propuesta Desde el Modelo de Valoración de Activos de Capital (CAPM)
Provedor de dados: 113
Autores: Morán V,Pablo.
El costo de capital es un insumo clave para obtener el valor fundamental de un activo o proyecto. En este trabajo se estima el costo de capital del sector vitivinícola chileno a través del Modelo de Valoración de Activos de Capital (CAPM, del inglés Capital Asset Pricing Model). Se discuten brevemente las dificultades que emergen al utilizar este modelo de equilibrio en la práctica, y la literatura empírica reciente sobre la estimación del coeficiente de riesgo sistemático (Beta). Basado en una muestra de empresas del sector vitivinícola chileno, e información histórica y de mercado, se encontró que el costo de capital asociado al giro vitivinícola en Chile asciende a 8,9% real anual
Tipo: Journal article
Palavras-chave: Tasa de descuento; Estimación robusta; Ajuste Bayesiano.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000300010

Costodorsalis ­ an Additional Slip of Pectoralis Major Muscle: a Case Report
Provedor de dados: 77
Autores: Shetty,Surekha D; Nayak,Satheesha B; Kumar,Naveen; Somayaji,S. N; Rao,Mohandas K. G.
Occurrence of variant muscular slips from pectoralis major muscle is rare. In this report, we present a rare case of aberrant muscular slip associated with the pectoralis major muscle which we call costodorsalis. This muscular slip originated from the 6th rib near the costochondral junction and ran along the lower border of pectoralis major muscle. It crossed the axilla from medial to lateral side and merged with the latissimus dorsi muscle. This type of origin and insertion is unique and has not been reported earlier. The knowledge of this muscle variation may be of special importance to the anesthesiologists, physiotherapists and plastic surgeons.
Tipo: Journal article
Palavras-chave: Pectoralis major muscle; Latissimus dorsi muscle; Axilla; Variant muscular slip.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200017

Cotton genetic diversity study by AFLP markers
Provedor de dados: 69
Autores: Murtaza,Naveed.
Amplified fragmentlength polymorphism (AFLP) markers have been used to ascertain the intensity of inherent diversity and relatedness in cotton (Gossypium spp.) plants. The effectiveness of this method to distinguish inter and intra specific difference in cotton could be handy in cultivar recognition and in marker assisted parental selection tool for plant breeders. Twenty cotton cultivars belonging to Gossypium hirsutum L., and G. arborium L. from the Pakistan and US origin were used for AFLP based genetic diversity estimates. The objective of this study was to assess the level of genetic variation among some cotton cultivars belonging to the old and new world species of cotton. Four EcoRI-MseI primer-pair combinations were used forthe AFLP analysis. The...
Tipo: Journal article
Palavras-chave: AFLP; Cluster analysis; Cotton; Genetic diversity; PCR.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400013

Coupled Multiple Musculo-Neurovascular Variations in Same Upper Limb: A Case Report and Clinical Significances
Provedor de dados: 77
Autores: Ariyo,Olutayo.
Variants of the median nerve, extra forearm flexor muscles heads are relationships of the persistent median artery (PMA) that have been extensively reported. We report the findings of a PMA (diam. 3.25 mm), a pierced median nerve, and accessory heads of the flexor digitorum profundus (FDP) and flexor policis longus (FPL) muscles coexisting with a brachioradial artery (BRA) (diam.1.8mm) in the left upper limb of a 65 year-old male cadaver. The median nerve provided a ring for the passage of the PMA about the junction of the proximal and middle thirds of the forearm. Both accessory muscles were placed anterior to the ulnar artery, with the brachioradial artery coursing superficially in the brachium and antebrachium. The notable diameter of the PMA may be...
Tipo: Journal article
Palavras-chave: Persistent median artery; Pierced median nerve; Extra forearm muscle bellies; Brachioradial artery; Carpal tunnel syndrome.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400036

Course Pattern of the Muscular Branch of the Median Nerve in Sri Lankans Hand
Provedor de dados: 77
Autores: Senanayake,Kithsiri J; Salgado,Sujatha; Fernando,Ranil.
Transligamentous variant of the recurrent motor branch is having a higher risk of getting damage during both endoscopic and open carpal tunnel releases. The incidence of the transligamentous variant is about 7% to 80% world wide. This wide variation of the incidence could be due to the failure of identification of the distal edge of the flexor retinaculum from the obliquely oriented fascia that runs from the distal edge. We used two criteria to identify the distal edge; the abrupt change in the thickness of the flexor retinaculum and its colour change in cross section. The incidence of transligamentous variant is rare and the reported high incidence could be due to an error in identification of the distal edge of the flexor retinaculum as shown by Kosin...
Tipo: Journal article
Palavras-chave: Median nerve; Muscular branch; Flexor retinaculum; Hand; Sri Lankans.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400017

Courtship behavior and potential indications for chemical communication in Artemia franciscana (Kellog 1906)
Provedor de dados: 72
Autores: TAPIA,CAROLA; PARRA,LEONARDO; PACHECO,BETANIA; PALMA,RUBÉN; GAJARDO,GONZALO; QUIROZ,ANDRÉS.
Two behavioral experiments were performed to test that A. franciscana shows specific courtship patterns, which in part, would be governed by semiochemicals released by females. The courtship ethogram, based on 30 adult virgin pairs (1 female v/s 1 male) individually video recorded for 1 hour, revealed that males display four independent activity patterns: 1) approach and touch, 2) swim behind, 3) riding attempt, and 4) riding success. The analysis of the transitions among the observed patterns suggested two ways to achieve riding success, both requiring female touch. In one, males approach and touch females followed by riding attempt (27% probability of occurrence), but if the latter fails, males start over from approach and touch (23% probability of...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200005

Cracking in sweet cherries: A comprehensive review from a physiological, molecular, and genomic perspective
Provedor de dados: 117
Autores: Balbontín,Cristián; Ayala,Héctor; M. Bastías,Richard; Tapia,Gerardo; Ellena,Miguel; Torres,Carolina; Yuri,José Antonio; Quero-García,José; Ríos,Juan Carlos; Silva,Herman.
Rain-induced cracking in fruits of sweet cherry (Prunus avium L.) is a problem in most producing areas of the world and causes significant economic losses. Different orchard management practices have been employed to reduce the severity of this problem, although a complete solution is not yet available. Fruit cracking is a complex phenomenon and there are many factors that seem to be involved in its development. During the last decade, genomic and biochemical approaches have provided new insights on the different mechanisms that could be involved in the differential susceptibility shown by commercial cultivars. For instance, sweet cherry genome and transcriptome sequencing information have provided new opportunities to study the expression and structure of...
Tipo: Journal article
Palavras-chave: Physiology; Functional genomics; RNA seq.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000100010

Cranial Capacity in an Adult Sri Lankan Population: Sexual Dimorphism and Ethnic Diversity
Provedor de dados: 77
Autores: Ilayperuma,I.
Cranial capacity exerts a close correlation with the volume of the brain. A large body of evidence shows a clear racial variation in cranial dimensions. Therefore detailed knowledge of the population specific data on biometric features of the cranial cavity is important in the study and comparison of the crania of populations from different racial backgrounds, assessing growth and development of an individual and in the diagnosis of any abnormalities of cranial size and shape. Despite its significance, little is known concerning the cranial capacity in Sri Lankans. Hence, the present study was undertaken to establish the cranial capacity in an adult Sri Lankan population. A total of 210 subjects with an age span of 20-23 years were included in the study....
Tipo: Journal article
Palavras-chave: Cranial capacity; Linear dimensions; Regression analysis; Sri Lanka.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200029

Cranial Osteology of the Armadillo Chaetophractus villosus (Mammalia, Xenarthra, Dasypodidae)
Provedor de dados: 77
Autores: Squarcia,Silvia Margarita; Sidorkewicj,Nora Silvia; Casanave,Emma Beatriz.
The morphology and morphometry of the cranial bones of Chaetophractus villosus were studied. The skull components are morphologically similar between adults of both sexes, and follow the generalized pattern for most of described dasypodids. The morphometric analysis, however, demonstrated that the bones lying in the rostrocaudal plane are mostly longest in females, determining higher values of the total, basal and condilobasal lengths of the skull, which are the main variables that contribute to a sexual dimorphism in this species
Tipo: Journal article
Palavras-chave: Dasypodidae; Morphology; Osteology; Skull; Sexual dimorphism.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500004

Craniofacial Anthropometry in a Young Nigerian Population: the Canthal Distances
Provedor de dados: 77
Autores: Jaja,Blessing N.R; Fawehinmi,Hakeem B; Jack,Joy T.
The measurement of craniofacial parameters have clinical, forensic and anthropologic significance. Local data on inner canthal and outer canthal distances and the canthal index may reveal the pattern of differential growth in craniofacial features resulting from factors such as sex, diet and genetic distinctions. In the present study, we provide normative data on canthal distances in a Nigerian population which has not been studied previously, utilizing a study design which optimises the effect of age and minimise bias and confounding than previous studies in Nigerian groups. The mean inner canthal distance was 1.85±0.30cm and 2.07±0.29cm (males vs. females, p= 0.000); mean outer canthal distance, 10.39±0.56cm and 10.40±0.98cm (males vs. female, p= 0.899)....
Tipo: Journal article
Palavras-chave: Biological anthropology; Craniofacial anthropometry; Canthal distance; Nigeria; Kalabari.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300041

Craniofacial chronological microdifferentiation of human prehistoric populations of the Azapa valley, northern Chile
Provedor de dados: 97
Autores: ROTHHAMMER,FRANCISCO; SANTORO,CALOGERO M.; MORAGA,MAURICIO.
Archeological evidence suggest that the cultural developments occurred in the highlands around lake Titicaca in the Central Andes, exerted influence on the cultural elaborations of the human groups that peopled the valley of Azapa, close to the city of Arica, and the Pacific coast of northern Chile. In this communication we show by means of a distance analysis, that a craniofacial differentiation accompanied the process of cultural evolution in the valley. The biological influence of Tiwanaku is partially reflected in craniofacial morphology, providing preliminary evidence that cultural changes were associated to intermittent gene flow from the highlands, specially during the Alto Ramírez and San Miguel phases
Tipo: Journal article
Palavras-chave: Craniometrical distance analysis; Andean prehistoric populations.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100023

Craniofacial Classification of Normal Newborns in Maiduguri Metropolis, Nigeria
Provedor de dados: 77
Autores: Garba,S. H; Numan,A. I; Mishara,I. G.
Anthropometric measurements, such as craniofacial forms especially in the first days after birth are important for the assessment of neonatal health status and results obtained from such measurements are used in pediatrics, orofacial surgery and diagnostic comprehension between patient and normal populations. There is no published literature about the types of head and face shapes in the Kanuri and Babur/Bura newborns of Maiduguri metropolis. Henee, this study was undertaken to document the various craniofacial forms of newborns of Maiduguri metropolis. Head length, head width, head circumference, face length, face width, prosopic and cephalicindices were measured in 120 newborns of the Maiduguri metropolis. The mean cephalicindex in Kanuri male and female...
Tipo: Journal article
Palavras-chave: Cephalic index; Prosopic index; Kanuri; Babur/Bura; Dolicocephalic hypereuryprosopic.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200026

Craniofacial Forms among Three Dominant Ethnic Groups of Gombe State, Nigeria
Provedor de dados: 77
Autores: Maina,M. B; Mahdi,O; Kalayi,G. G.
Anthropometric measurements such as cranial and facial forms provide essential information that can be used added provide in orofacial surgery and in diagnostic comprehension between patient and normal populations. There is no published literature about the types of head and face shapes in Fulani, Tangale and Tera ethnic groups of Nigeria. Hence, this study was undertaken to document the various cranial and facial forms of these ethnic groups residing in Gombe region of North-Eastern Nigeria. Head length, head width, head circumference, face length and face width were measured and the cephalic and prosopic indices calculated in a total of 300 subjects (150 males and 150 females). Results analyzed placed all males of the three ethnic groups in...
Tipo: Journal article
Palavras-chave: Cephalic index; Prosopic index; Head types; Face types.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100038

Craniofacial Morphometry for Craniofacial Implant
Provedor de dados: 77
Autores: Olate,Sergio; de Moraes,Paulo Hemerson; Caria,Paulo Henrique Ferreira; Netto,Henrique Duque de Miranda Chaves; Barbosa,José Ricardo de Albergaria.
Craniofacial implants are being increasingly used to treat patients with sequelae of oncological resections, trauma, and congenital deficiencies, among other issues. The aim of this investigation was to establish the minimum and maximum bone dimensions present in the most used places for the insertion of craniofacial implants. A descriptive study was designed analyzing 40 human skulls using cone-beam computed tomography; in the volumetric reconstruction the points most often used in clinical investigations for the insertion of implants were selected, representing the orbital, perinasal, zygomatic bone and periauricular regions, measuring the distance between the cortical bones on the sagittal, axial and coronal planes; comparisons between gender and with...
Tipo: Journal article
Palavras-chave: Craniofacial implants; Bone morphometry; Extra-oral implant.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300063

Craniometric Characteristics and Cranial Indices of Polish Heath Sheep Rams ­ Extended Data
Provedor de dados: 77
Autores: Baranowski,Piotr.
The study was conducted on the mouflon-derived horned sheep of the preserved Polish Heath Sheep breed. In this study, basic skull measurements of 24 skulls of the rams of different age: 1 day, 90 days, 210 days, 270 days, 3 and 6 years, were analyzed. The weight of each skull was determined, as well as 43 craniometric characteristics were measured, and cranial cavity volume and viscerocranial and neurocranial indices were calculated. From birth to the age of 6 years, the greatest length of the skull, the condylobasal length and the length of the cheek-tooth row increased two-fold. To day 210 of age, the bony housing for eyeball and its organs grew intensively. To day 270 of age, the largest increase was characteristic of the elements of the angular length...
Tipo: Journal article
Palavras-chave: Skull; Neurocranium and viscerocranium measurements; Polish Heath Sheep; Endangered breeds.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100022

Craniometric Study of Nasal Bones and Frontal Processes of Maxilla
Provedor de dados: 77
Autores: Costa,Jecilene Rosana; Prates,José Carlos; de Castilho,Helton Traber; Santos,Rafael de Almeida.
Knowing the anatomy of the nasal framework and its components, as well as their relations of size and shape is essential to correctly and safely perform nasal surgery, such as rhinoplasty. Symmetry and proportion of nasal bones and frontal processes of the maxilla related to patient's skull shape is not yet well established. Variation of these proportions due to differences in skull shape may interfere in the results of rhinoplasty, leading to poor aesthetic results and postoperative complications. This paper's objective is to measure and evaluate differences in shape and size of bony components of nasal framework (nasal bones and frontal process of maxilla) among different classes of skull shape. 121 skulls from UNIFESP-EPM Anatomy Museum, filed with...
Tipo: Journal article
Palavras-chave: Craniometry; Rhinoplasty; Nasal bone; Maxilla; Craniometry; Rhinoplasty; Nasal bone; Maxilla.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000100002

Craniometrical Studies on the Skull of Tibetan Gazelle (Procapra Picticaudata)
Provedor de dados: 77
Autores: Zhu,Lei.
A total of 10 skulls of Tibetan gazelle were utilized in this study. Craniometric measurements for 22 different parts of the skull were made. Skull indices and ratios were calculated. A skull index of 43.22±0.44, a cranial index of 58.37±0.80 and a facial index of 116.37±1.24 were obtained.
Tipo: Journal article
Palavras-chave: Craniometry; Skull; Procapra Picticaudata.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100035

CREACIÓN DE LA POBLACIÓN PQUI-1 DESARROLLADA CON TOLERANCIA A FRÍOMEDIANTE SELECCIÓN RECURRENTE EN ARROZ
Provedor de dados: 113
Autores: Hernaiz L.,Santiago; Alvarado A.,Roberto; Chatel,Marc; Borrero,Jaime.
El acervo genético de arroz (Oriza sativa L.) GPIRAT- 10 formado por variedades y líneas de tipo japónica, con tolerancia a frío, se cruzó con material chileno. Como resultado se obtuvo una nueva población para selección recurrente denominada PQUI-1. En esta nueva población participa GPIRART- 10 en un 50 %; Diamante en un 10,3%; Buli 13,3%; Brillante16,22%; CINIA 609 5,09% y CINIA 606 5,09%. La población PQUI-1 tiene características de mayor precocidad y conserva su tolerancia a frío. Durante el primer ciclo de recombinación se sembró la población PQUI-1 en dos ecosistemas diferentes (Colchagua y Chillán), se realizó selección de plantas por medio ambiente y características agronómicas, obteniéndose dos nuevas poblaciones, que se denominaron PQUI-1 \CO\0\1...
Tipo: Journal article
Palavras-chave: Población recurrente; Tolerancia a frío; Mejoramiento arroz.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000200009

Crecimiento radial de la especie endémica Nothomyrcia fernandeziana (Hook. &amp;amp; Arn.) Kausel y la invasora Aristotelia chilensis (Molina) Stuntz en la isla Robinson Crusoe, Archipiélago de Juan Fernández, Chile
Provedor de dados: 73
Autores: Rojas-Badilla,Moisés; Le Quesne,Carlos; Álvarez,Claudio; Velásquez-Álvarez,Gonzalo; Rozas,Vicente.
RESUMEN Nothomyrcia fernandeziana (Hook. &amp; Arn.) Kausel es una especie endémica de los bosques de la isla Robinson Crusoe (RC), Archipiélago de Juan Fernández, Chile. Aristotelia chilensis (Molina) Stuntz es una especie invasora introducida en la isla a mediados del siglo XIX que compite con las especies endémicas, poniendo en riesgo su conservación. Los patrones de crecimiento radial permiten inferir estrategias biológicas de las plantas leñosas como longevidad, tolerancia a la sombra y capacidad competitiva, características de gran importancia para los programas de conservación. Los objetivos de este trabajo fueron caracterizar los anillos de crecimiento de ambas especies y estudiar sus patrones de crecimiento con el objeto de aportar conocimiento...
Tipo: Journal article
Palavras-chave: Anillos de crecimiento; Restauración; Dendroecología; Conservación.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100111

Crecimiento vegetativo, productividad y tolerancia a la deficiencia de hierro en seis portainjertos de duraznero creciendo en suelo calcáreo
Provedor de dados: 118
Autores: Sotomayor,Carlos; Ruiz,Rafael; Castro,Jorge.
Iron deficiency is a major problem that affects many fruit crops grown on calcareous soils. A four-year study was conducted to evaluate the effect of calcareous soils on the vegetative growth and productivity of six peach rootstocks (Nemaguard, Atlas, MRS 2/5, Cadaman, GF 677 and GxN15) grafted with 'Ruby Diamond' nectarines. Trees were planted in 100 L containers filled with a sandy loam textured, calcareous soil (6.3% active calcium carbonate) with a pH of 8.0 and an intermediate level of available iron (5 mg kg-1 of Fe+2). The trunk diameter during the 4th growing season was larger in GF 677, GN 15, Cadaman and Atlas, whereas Nemaguard and MRS 2/5 showed smaller average values. Cadaman and Atlas presented the highest pruning weight (a measure of...
Tipo: Journal article
Palavras-chave: Calcareous soil; Fe+2; Iron chlorosis; Peach rootstock; SPAD.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000300013

Crecimiento y Desarrollo de Bromus berteroanus Colla Sometido a Diferentes Regímenes Pluviométricos
Provedor de dados: 113
Autores: Olivares,Alfredo; Johnston,Myrna; Gutierrez,Christian.
En invernadero frío se estudió la producción vegetativa de Bromus berteroanus Colla sometido a diferentes regímenes pluviométricos reales simulados del secano interior de la Región Metropolitana. Se usaron tres niveles de precipitación total correspondientes a un año seco, uno normal y uno lluvioso, y en cada uno de ellos se eligió un año con distribución temprana, normal y tardía. Las precipitaciones en cada tratamiento se aplicaron de acuerdo al calendario de intervalos de tiempo real entre las lluvias, comenzando con la primera lluvia efectiva. Se observó desarrollo fenológico y se midió fitomasa vegetativa incluyendo vástagos por maceta y materia seca de tallos, hojas y raíces. Se observó que en todos los tipos de años estudiados, B. berteroanus...
Tipo: Journal article
Palavras-chave: Crecimiento; Desarrollo; Régimen pluviométrico.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000200007

Crecimiento y producción de nuevas leguminosas forrajeras anuales en la zona mediterránea de Chile: I. Comportamiento de las especies en la Cordillera Andina
Provedor de dados: 113
Autores: Ovalle M.,Carlos; del Pozo L.,Alejandro; Arredondo S.,Susana; Chavarría M.,Jorge.
Se realizó este estudio durante tres temporadas (2000-2002) en la precordillera andina de la zona Centro Sur de Chile. El clima es mediterráneo perhúmedo, con 1200 mm de precipitación anual, suelo de origen volcánico (trumao) (ashy, mesic typic Haploxerands), profundo (&gt; 1 m), textura liviana. Se evaluó el comportamiento productivo de una colección de leguminosas forrajeras anuales: seis cultivares de Ornithopus compressus, una accesión y un cultivar de Ornithopus sativus, un cultivar y dos accesiones de Biserrula pelecinus, y un cultivar de cada una de las siguientes especies: Trifolium michelianum, Trifolium resupinatum, Trifolium vesiculosum y Medicago polymorpha. Como testigo se utilizó trébol subterráneo (Trifolium subterraneum var. subterraneum)...
Tipo: Journal article
Palavras-chave: Serradela; Biserrula; Paradana; Hualputra; Producción de MS; Producción de semilla.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100004

Cre-loxP recombination vectors for promoter studies
Provedor de dados: 69
Autores: Pedersen,Nina; Tuxen Poulsen,Thomas; Skovgaard Poulsen,Hans.
For promoter studies the cloning, subcloning and transfer to different plasmid vectors usually requires use of restriction enzymes and ligation reactions. One obstacle is the nucleotide polymorphisms of eukaryotic genomic DNA, which has the consequence that a sequence often differs from published sequences. Therefore sequencing, rigorous restriction enzyme analysis or introduction of suitable sites has to be performed prior to cloning and subcloning. In addition, conventional methods using restriction enzymes, insert purifications and ligations is expensive and labour demanding. We have developed a fast, efficient and inexpensive Cre recombinase-loxP based method, which allows cloning of promoter regions and subcloning of these into a variety of vectors in...
Tipo: Journal article
Palavras-chave: Cloning; Cre recombinase; Plasmid; Reporter genes; Therapeutic genes.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200013

CRESCIMENTO INICIAL E ESTADO NUTRICIONAL DO TRIGO SUBMETIDO À APLICAÇÃO DE ZINCO VIA SEMENTÉ
Provedor de dados: 127
Autores: Mello Prado,Renato de; Ferreira Frade Junior,Elízio; Rinaldi Mouta,Ernesto; Cássia Gomes São João,Andréia de; Savério Souza Costa,Roberto.
Objetivou-se avaliar o desenvolvimento inicial e a nutrição da cultura do trigo ( Triticum aestivum L.) em função da aplicação de zinco (Zn) via sementé. O delineamento experimental foi o de blocos inteiramente casualizados, com fatorial 4 x 2+1, sendo [quatro doses de Zn, 100; 200; 400 e 800 g por 100 kg de sementé e duas Zn fontes, ZnS0(4) e ZnO] e tres repeticoes. Avaliou-se o índice de velocidade de emergencia, a altura media das plântulas, a materia seca em folhas e raizes e o teor e o acumulo de Zn das plântulas e o índice de eficiencia de absorção. A aplicação de zinco ñas sementes de trigo afetou o estado nutricional e a produção de materia seca das plântulas. As plântulas apresentaram maior eficiencia de absorção quando o Zn foi fornecido na forma...
Tipo: Journal article
Palavras-chave: Triticum aestivum L.; Micronutrientes; Tratamento de sementes; Nutrição mineral de plantas.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000200003

CRIANZA ARTIFICIAL DEL CARACOL DE AGUA DULCE Physa venustula Gould PARA ESTUDIOS ECOTOXICOLÓGICOS DE PLAGUICIDAS
Provedor de dados: 113
Autores: Iannacone O.,José; Caballero R.,Cecilia; Alvariño F.,Lorena.
Se realizó una crianza artificial estandarizada del caracol de agua dulce Physa venustula Gould para estudios ecotoxicológicos de plaguicidas. Los bioensayos se estandarizaron con el protocolo de crianza con cuatro camadas de P. venustula, alimentadas con una solución de Cereal Leaves® y hojuelas de pescado y Chlorella vulgaris en nuestro laboratorio. La oviposición siguió un patrón descendente a través del tiempo. La eclosión de los huevos fue de 7 a 14 d bajo condiciones experimentales. El promedio de huevos por cápsula fue de 12,04 ± 10,66 (rango = 1 a 45) y el porcentaje promedio de fecundidad fue de 65,22%. En los caracoles que produjeron más masas, éstas contuvieron menor número promedio de huevos. El alimento Cereal Leaves® demostró ser una dieta...
Tipo: Journal article
Palavras-chave: Crianza artificial; Caracol; Condiciones de laboratorio.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000200014

Criopreservación de Espermatozoides Caninos a - 80C
Provedor de dados: 77
Autores: Salinas,Paulo; Sánchez,Raúl; Risopatrón,Jennie.
La congelación y almacenamiento en nitrógeno líquido (N2L) es la técnica más utilizada para preservar el semen de canino y de otras especies domésticas durante largos períodos de tiempo. Este estudio fue diseñado para validar el uso del ultracongelador de -80C para congelar y almacenar semen canino en pajuelas. Tres protocolos fueron ensayados (n=10): Control: semen congelado y almacenado en N2L; Exp. 1: semen congelado y almacenado -80C, y Exp.2: semen congelado a -80C y almacenado en N2L. Postdescongelación se evaluó por citometría de flujo la viabilidad e integridad de membrana plasmática (SYBR-14/PI), potencial de membrana mitocondrial (DYm; JC-1), integridad de la membrana del acrosoma (PSA/FITC­PI), translocación de fosfatidilserina...
Tipo: Journal article
Palavras-chave: Canino; Espermatozoide; Congelación; Ultracongelador de -80C.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100036

Criopreservación de Espermatozoides de Canino con Extracto de Hojas de Arándano (Vaccinium corymbosum L.)
Provedor de dados: 77
Autores: Deppe,Mariana; Pezo,Felipe; Reyes-Díaz,Marjorie; Risopatrón,Jennie.
La criopreservación espermática induce daño por estrés oxidativo en las células, lo que conlleva a un deterioro de la calidad del semen descongelado. Los espermatozoides pueden ser protegidos de este daño, por la adición de antioxidantes al medio de congelación. El objetivo de este estudio fue determinar el efecto de la adición de extracto de hojas de arándano (EHA) al medio de congelación, sobre la calidad de espermatozoides de canino criopreservados. Espermatozoides desprovistos del plasma seminal fueron congelados con diferentes concentraciones de EHA (0 %, control; 1 %, EHA1; 2 %, EHA2; 4 %, EHA4 y 6 %, EHA6) adicionadas al medio de congelación. Post descongelación se evalúo la motilidad progresiva; la viabilidad e integridad de la membrana plasmática...
Tipo: Journal article
Palavras-chave: Canino; Espermatozoides; Criopreservación; Antioxidantes; Arándano.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200037

CRISOFITAS ESCAMOSAS DE ECUADOR
Provedor de dados: 73
Autores: Wujek,Daniel E.; Dziedzic,Ryan M.
Treinta crisófitas escamosas, obtenidos de 60 cuerpos de agua en Ecuador, fueron observados mediante microscopía electrónica. Los taxones comprenden 27 Synuraceae (19 Mallomonas spp., siete Synura spp., y una especie de Chrysodidymus) y tres Chrysophyceae (dos Paraphysomonas spp. y una especie de Spiniferomonas). Todas son nuevos informes para Ecuador y un taxon (Mallomonas lychenensis f. ecuadorensis) se describe como nuevo. El número de taxones por muestra varió de ninguno a diez
Tipo: Journal article
Palavras-chave: América del Sur; Chrysophyceae; Synuraceae.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100002

Critical role of plant biotechnology for the genetic improvement of food crops: perspectives for the next millennium
Provedor de dados: 69
Autores: Ortiz,Rodomiro.
This article reviews some of the highlights of modern plant biotechnology and discusses the potential applications of biotechnology in the betterment of farming systems in the next millennium. Plant biotechnology will facilitate the farming of crops with multiple durable resistance to pests and diseases, particularly in the absence of pesticides. Likewise, transgenes or marker-assisted selection may assist in the development of high yielding crops, which will be needed to feed the world and save land for the conservation of plant biodiversity in natural habitats. Hence, crops should be engineered to meet the demands and needs of consumers. The genetic base of crop production can be preserved and widen by an integration of biotechnology tools in...
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000300005

Crónica de un conflicto anunciado: Tres centrales termoeléctricas a carbón en un hotspot de biodiversidad de importancia mundial
Provedor de dados: 97
Autores: CÁRCAMO,P. FRANCISCO; CORTÉS,MARITZA; ORTEGA,LORENA; SQUEO,FRANCISCO A; GAYMER,CARLOS F.
El aumento de la demanda energética chilena en los últimos años ha promovido la creación de una gran cantidad de proyectos de generación eléctrica. La posible instalación de tres centrales termoeléctricas a carbón al norte de la Región de Coquimbo y en las inmediaciones de áreas definidas como claves para la conservación y manejo de la biodiversidad marina (e.g., reservas marinas, áreas de manejo y explotación de recursos bentónicos) y terrestre (e.g., reserva nacional, sitios prioritarios), ha generado conflictos sociales y controversias sobre su ubicación y compatibilidad con los usos propuestos para el área. El presente comentario plantea el conflicto que se origina entre la necesidad de cubrir los requerimientos energéticos de Chile y la implementación...
Tipo: Journal article
Palavras-chave: Conflicto social; Conservación; Planificación espacial marina; Reserva marina; Termoeléctricas a carbón.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200003

Cross-amplification of microsatellites from the Atherinopsidae Odontesthes perugiae and Odontesthes argentinensis to Chilean silversides of the genus Odontesthes and Basilichthys
Provedor de dados: 72
Autores: Muñoz,Pablo; Quezada-Romegialli,Claudio; Vila,Irma; Véliz,David.
We tested the amplification potential of 8 microsatellites initially described for Odontesthes perugiae and O. argentinensis in 3 species of Odontesthes and 4 species of Basilichthys. Most of the microsatellites amplified and showed polymorphism; thus they will be useful in genetic conservation plans for these species.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200007

Crown and root rot of highbush blueberry caused by Phytophthora cinnamomi and P. citrophthora and cultivar susceptibility
Provedor de dados: 118
Autores: Larach,Alejandra; Besoain,Ximena; Salgado,Eduardo.
Chile is the largest producer and exporter of blueberries in the southern hemisphere. During the 2006-2007 growing season, blueberry production increased in Chile as a result of an expansión of the planted área, reaching around 10,762 ha in 2007. Fungal diseases are of great importance in blueberry production; among them, Phytophthora root rot is a disease known worldwide as a major cause of death for highbush blueberry plants in the USA. Symptoms of Phytophthora root rot have been detected over the last four years in Chile. Nevertheless, the causal agents have not been previously described in Chile. This study aims to determine the pathogenicity of Phytophthora spp. isolated from highbush blueberry and to study cultivar susceptibility. The pathogenicity...
Tipo: Journal article
Palavras-chave: Blueberry diseases; Highbush blueberry; Blueberry cultivars; Phytophthora; Vaccinium corymbosum.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300010

Crown-To-Root Ratios in Terms of Length, Surface Area and Volume: A Pilot Study of Premolars
Provedor de dados: 77
Autores: Liu,Lin; Li,Hongbo; Zhao,Tong; Gao,Yuxuan; Guo,Jing; Wang,Xiaoyu; Li,Xuesheng.
The objective of this study was to construct three-dimensional (3D) images of premolars to measure the length, surface area and volume of crown and root and to analyze the mathematical relation among crown-to-root ratios in terms of length, surface area and volume. Twenty-five premolars were scanned using micro-computed tomography (micro CT) in vitro to build 3D models. The long axis and enamelo-cemental junction of each tooth were determined with the help of Geomagic Studio software, and the length, surface and volume of crown and root were measured. The crown-to-root ratios in terms of length, surface and volume were calculated and the relationship among length, surface area and volume of crown and root as well their ratios were analyzed using SPSS...
Tipo: Journal article
Palavras-chave: Bicuspid; Tooth crown; Tooth root.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200009

Crude extracts of Drimys winteri bark to inhibit growth of Gaeumannomyces graminis var. tritici
Provedor de dados: 117
Autores: Zapata,Nelson; Vargas,Marisol; Monsálvez,Manuel; Ceballos,Ricardo.
The aim of this study was to assess the effect of Drimys winteri J.R. Forst. &amp;amp; G. Forst. bark and its extracts, obtained sequentially with n-hexane, acetone, and methanol, against Gaeumannomyces graminis var. tritici (Ggt). Ground bark of D. winteri was mixed with potato dextrose agar growth media at concentrations of 250, 500, 1000, 2000, and 4000 mg L-1 in Petri plates. Each extract was mixed at concentrations of 100, 200, 400, and 800 mg L-1. Petri plates were inoculated in the center with a 5-mm mycelium disk and were incubated at 24 ± 1 ºC. Daily measurements of mycelium radial growth were taken to determine growth rate and growth inhibition (%). A ground bark concentration of 978 mg L-1 was needed to inhibit Ggt growth by 50%, while extracts...
Tipo: Journal article
Palavras-chave: Wheat take-all; Soil borne; Plant extracts; Ggt.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100006

Crypsis in early benthic phases of Brachyuran Decapod Crustaceans in central Chile
Provedor de dados: 97
Autores: PALMA,ÁLVARO T.; ORREGO,CAEL; ARRIAGADA,MAURICIO.
Although common and in some cases of commercial value, little is known about the mechanisms and processes that affect the distribution and abundance of many species of decapod crustaceans, particularly in Chile. All of these species have planktonic larvae that must settle and recruit before becoming part of the adult segments of their populations. For several of these species we have detected the presence of a variety of color morphs in newly settled individuals. The existence of these morphs in Chilean species is comparable with those observed in other latitudes (e.g., coast of the Gulf of Maine). On the other hand, it is characteristic that the occurrence of these patterns only appears during the early juvenile stages and that after reaching a certain...
Tipo: Journal article
Palavras-chave: Crypsis; Behavior; Brachyuran Decapods; Settlement; Recruitment; Central Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200002

Cryptobia neghmei sp. n. (Protozoa: Kinetoplastida) in two species of flounder, Paralichthys spp. (Pisces: Paralichthydae) off Chile
Provedor de dados: 97
Autores: KHAN,RASUL A.; LOBOS,VÍCTOR; GARCÍAS,FÉLIX; MUÑOZ,GABRIELA; VALDEBENITO,VERÓNICA; GEORGE-NASCIMENTO,MARIO.
Cryptobia neghmei sp.n. is described from the blood of two species of flounder, Paralichthys microps and P. adspersus, inhabiting the Chilean coast in the southern Pacific Ocean. Flagellates were elongate, slender, with two flagella and a conspicuous undulating membrane. It was distinguished from previously described species on the basis of its unusual shape and dimensions. All of 97 flounder were infected upon examination. Developmental stages of kinetoplastid protozoans, perhaps C. neghmei sp. n., were observed in some leeches Glyptonotobdella sp. that were found attached to flounder, which probably represent a mode for transmission among piscine hosts
Tipo: Journal article
Palavras-chave: Cryptobia neghmei; Hemoflagellate; Flounder; Paralichthys microps; Paralichthys adspersus; Coastal Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400004

CTENARYTAINA EUCALYPTI (MASKELL 1890): THE BLUE GUM PSYLLID IN CHILE (HEMIPTERA: STERNORRYNCHA: PSYLLOIDEA: SPONDYLIASPININAE)
Provedor de dados: 72
Autores: Olivares,Tania S.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200014

Cu, Pb AND Zn DISTRIBUTION IN NEARSHORE WATERS IN SAN JORGE BAY, NORTHERN CHILE
Provedor de dados: 72
Autores: Salamanca,Marco A.; Camaño,Andrés; Jara,Bibiana; Rodríguez,Tatiana.
An extensive spatial survey metal content to study the spatial distribution of Cu, Pb and Zn concentration in nearshore waters of San Jorge Bay, along the coast of Antofagasta City, Chile was carried out located near the Atacama desert, which represent the largest populated urban settlement in northern Chile (~ 260,000 inhabitants). The coastal zone of this area is under an intensive use as discharge location of pollutants of different sources. Dissolved Cu varies between 0.97 to 1.65 mug l-1, in the southern part of the study area and in front of an industrial discharge, respectively. The dissolved Pb shows a narrow concentration range (0.019 to 0.029 mug l-1) and Zn content varies between 1.7 mug l-1 in the northern part of the study area to 2.0 mug l-1,...
Tipo: Journal article
Palavras-chave: Trace metal distribution; Coastal waters; Desert areas.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200009

¿Cuál es el Rol de la Cirugía en el Tratamiento de un Paciente con Cáncer de la Vesícula Biliar Estadio IIIb?
Provedor de dados: 77
Autores: Manterola,Carlos; Conejeros,Roque; Yáñez,Eduardo.
El cáncer de la vesícula biliar (CaVB), es una neoplasias frecuente en nuestro país. La supervivencia (SV) global no supera el 40% a 5 años. La invasión de la túnica serosa y el estadio IIIB, se asocian a menor SV por considerarse una etapa avanzada de la enfermedad; por ello no hay consenso respecto del rol de la cirugía en estos casos. El objetivo de este artículo es analizar la evidencia existente respecto del rol de la cirugía en el tratamiento de un paciente con CaVB estadio IIIb. Se realizó una búsqueda sistemática de la evidencia disponible en la bases de datos Clinical Evidence, National Health Service, Health Technology Assessment, Tripdatabase, Cochrane Library y PubMed. Se buscaron a documentos de resumen de la evidencia (overviews, guías de...
Tipo: Journal article
Palavras-chave: Neoplasia de la vesícula biliar; Cirugía de la neoplasia de la vesícula biliar; Procedimientos quirúrgicos sobre la vesícula biliar; Cáncer de la vesícula biliar; Cáncer de la vesícula biliar estadio III; Linfadenectomía.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200038

¿Cuáles son los Rangos de Normalidad de los Diámetros de la Aorta Infrarrenal, Medidos con Ultrasonografía 2D, en Sujetos sin Antecedentes de Enfermedad Vascular?
Provedor de dados: 77
Autores: Lagos,Marcelo; Manterola,Carlos.
El diámetro de la parte abdominal de la aorta (AAI), constituye un factor relevante para decidir reparar un aneurisma aórtico abdominal. El objetivo de este estudio es determinar rangos de normalidad de los diámetros de la AAI, medidos con ultrasonografía 2D, en sujetos sin antecedentes de enfermedad vascular. Estudio de corte transversal, realizado en los Hospitales Regional de Temuco y de Pitrufquen. Se estudiaron 399 sujetos mayores de 15 años, sin antecedentes de enfermedad vascular, que consultaron por cuadros de dolor abdominal. Se realizó ultrasonografía 2D con dos equipos diferentes (General Electric RT3200 Advantage II y Medison co. Ltda. Modelo SA-600; ambos con transductores de 3,5 Mhz.) y por dos observadores independientes. Las variables...
Tipo: Journal article
Palavras-chave: Aorta; Parte abdominal de la aorta; Diámetro de la parte abdominal de la aorta; Aneurisma de la parte abdominal de la aorta; Ultrasonografía; Estudio de corte transversal.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300033

CUANTIFICACION DEL TRANSPORTE DE AGUA COSTA-OCEANO A TRAVES DE FILAMENTOS Y REMOLINOS RICOS EN CLOROFILA a, EN LA ZONA CENTRO-SUR DE CHILE (35.5-37.5°S)
Provedor de dados: 72
Autores: Grob,Carolina; Quiñones,Renato A.; Figueroa,Dante.
Se cuantificó el transporte neto de agua superficial entre la zona costera y zona oceánica a través de estructuras de mesoescala (filamentos y remolinos) identificadas a partir de imágenes satelitales diarias de clorofila a (SeaWIFS). El transporte se cuantificó en el sector comprendido entre los 35.5 y 37.5°S de la zona centro-sur de Chile, para un período de 15 días en octubre de 1998 y otro de igual duración en julio de 1999, correspondientes a los cruceros MIRC I y MIRC II. En ambos cruceros el transporte neto de agua tuvo lugar desde la zona costera hacia la zona oceánica, con 6.22 x 10(4) m³ s-1 para el período del MIRC I y de 1.64 x 10(4) m³ s-1 para el MIRC II. El sector centro-sur de Chile estudiado es un exportador neto de agua a través de...
Tipo: Journal article
Palavras-chave: Surgencia; Filamentos; Remolinos; Sistema de la Corriente de Humboldt; Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100008

CUATRO ENSAYOS ECOTOXICOLOGICOS PARA EVALUAR LINDANO Y CLORPIRIFOS
Provedor de dados: 72
Autores: Iannacone,José; Alvariño,Lorena; Caballero,Cecilia; Sánchez,Javier.
La evaluación de riesgos ambientales por productos fitosanitarios es un componente de importancia en los estudios de impacto ambiental en el sector agrícola. Se evaluó la ecotoxicidad de los plaguicidas de suelo, lindano y clorpirifos, sobre la mortalidad del oligoqueto Limnodrilus hoffmeisteri (CL50 24h) y tres plantas, en las cuales se observaron los siguientes efectos subletales: germinación en Lactuca sativa (CI90 96h), crecimiento de raíz en Lycopersicon esculentum (CI50 96h) y clorosis, necrosis, ruptura y formación de hojas nuevas en la lenteja de agua, Lemna minor (CE50 48h). En ambos agroquímicos se observó en general el siguiente orden de ecotoxicidad decreciente: Lycopersicon Lemna Lactuca Limnodrilus. En los tres ensayos con plantas se observó...
Tipo: Journal article
Palavras-chave: Ensayo ecotoxicológico; Evaluación de riesgos ambientales; Agroquímico; Lindano; Clorpirifos; Limnodrilus; Lemna; Lycopersicon; Lactuca.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200003

Cubiertas Vegetales en Producción Orgánica de Frambuesa: Efectos sobre el Contenido de Nutrientes del Suelo y en el Crecimiento y Producción de las Plantas
Provedor de dados: 113
Autores: Ovalle M,Carlos; González A,María Inés; del Pozo L,Alejandro; Hirzel C,Juan; Hernaiz,Viviana.
Se realizó un estudio de evaluación y selección de cubiertas vegetales para mejora el manejo de suelos entre las hileras de un huerto orgánico de frambuesa (Rubus idaeus L.). Las cubiertas evaluadas fueron: mezcla de trébol subterráneo (Trifolium subterraneum L.) con trébol balansa (T. michelianum Savi), lotera (Lotus corniculatus L.), trébol blanco (T. repens L.), festuca (Festuca arundinacea Schreb.), mezcla de trébol blanco y festuca, y un testigo sin cubierta vegetal. El ensayo se realizó en Chillán, Chile (36°37’ lat. Sur, 72°00’ long. Oeste), durante dos temporadas. El diseño experimental fue de bloques al azar con cuatro repeticiones. La distancia de plantación entre hileras de frambuesa fue de &gt;3 m y cada parcela experimental tenía una...
Tipo: Journal article
Palavras-chave: Rubus idaeus; Trifolium repens; Trifolium michelianum; Trifolium subterraneum; Lotus corniculatus; Festuca arundinacea; Rubus idaeus; Trifolium repens; Trifolium michelianum; Trifolium subterraneum; Lotus corniculatus; Festuca arundinacea.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000300006

Cubiertas Vegetales en Viñedos: Comportamiento de mezclas de Leguminosas Forrajeras Anuales y Efectos sobre la Fertilidad del Suelo
Provedor de dados: 113
Autores: Ovalle,Carlos; del Pozo,Alejandro; Lavín,Arturo; Hirzel,Juan.
Con el objetivo de evaluar y seleccionar cubiertas vegetales como cultivos entre hileras, para mejorar el manejo del suelo en un viñedo (Vitis vinifera L.) cv. Cabernet Sauvignon, se evaluaron cinco cubiertas: a) testigo sin vegetación; b) testigo con vegetación espontánea; c) mezcla de leguminosas de cultivares precoces de trébol subterráneo (Trifolium subterraneum L.) con hualputra (Medicago polymorpha L.); d) mezcla de cultivares tardíos de trébol subterráneo con trébol balansa (T. michelianum Savi); e) mezcla de leguminosas tardías con ballica anual (Lolium rigidum Gaud .) El ensayo se realizó en el Centro Experimental Cauquenes del Instituto de Investigaciones Agropecuarias (INIA), durante dos temporadas, 2005-2006 y 2006-2007. El diseño experimental...
Tipo: Journal article
Palavras-chave: Cubiertas vegetales.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400006

Cultivation of Scenedesmus dimorphus for C/N/P removal and lipid production
Provedor de dados: 69
Autores: Xu,Xinmiao; Shen,Ying; Chen,Jiacheng.
Background CO2 emission, water pollution and petroleum shortage are the issues coming with the development of industry. A cost effective system was constructed to fix the CO2 in flue gas (15% CO2), remove nitrogen and phosphorus from manure wastewater and produce biofuels at the same time. The significant cultivation conditions were selected by Plackett-Burman design, and then optimized with central composite design. Results Optimum culture condition was predicted at light intensity of 238 µmol·m- 2·s- 1, TN of 152 mg·L- 1, inoculum density of 0.3 g·L- 1, under which the measured CO2 fixation rate, total nitrogen and phosphorus removing rate, and lipid content were 638.13 mg·L- 1·d- 1, 88.16%, 73.98% and 11.9%, respectively. The lipid content was then...
Tipo: Journal article
Palavras-chave: CO2 fixation rate; Flue gas; Lipid content; Scenedesmus dimorphus; Wastewater.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100009

Cultivation of Trichosporon mycotoxinivorans in sugarcane bagasse hemicellulosic hydrolyzate
Provedor de dados: 69
Autores: Matos,Ítalo Thiago Silveira Rocha; Cassa-Barbosa,Luciana Araújo; Neto,Pedro Queiroz Costa; Filho,Spartaco Astolfi.
Background: The yeast strain IB09 was isolated from the gut of Calosoma sp. (Carabidae, Coleoptera, Insecta) that were collected in the central Amazon rainforest. First, tolerance of the strain to ethanol and heat was tested. Then, IB09 was cultivated in a medium using sugarcane bagasse hemicellulosic hydrolyzate as a carbon source, and cell growth (OD600), specific growth rate (µMAX, h-1), biomass yield (Y B, g.g-1) and relative sugar consumption (RSC, %) were evaluated. Taxonomic identification was determined by sequencing the ITS1 region of IB09 and comparing it to sequences obtained from the GenBank database (NCBI). Results: IB09 showed both ethanol tolerance and thermotolerance. Relative sugar consumption indicated that IB09 was able to perform...
Tipo: Journal article
Palavras-chave: Amazon strain; Biomass production; Biotechnological potential; Saccharification.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100002

Culturable fungi associated with urban stone surfaces in Mexico City
Provedor de dados: 69
Autores: Páramo-Aguilera,Leandro; Ortega-Morales,Benjamín Otto; Narváez-Zapata,José Alberto.
Background: Urban surface stones in Mexico City are exposed to a temperate climate and a range of atmospheric conditions ranging from mildly impacted to heavily polluted areas. In this study, we focused on the characterization of the cultivable fungal component of selected biological patinas in the surrounding area of Chapultepec castle, a historic monument in Mexico City. Thirty four representative fungal isolates selected based on distinctive differential macroscopic characteristics out of a total of 300 fungi, were characterized using morphological and molecular approaches. Results: This identification strategy based on the combination of phenotypic- and molecular-based methodologies allowed us to discriminate the fungal community in some cases down to...
Tipo: Journal article
Palavras-chave: Aeroterrestrial habitat; Fungi; Stone surfaces; Urban buildings.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400004

Culture and growth of two benthic diatoms species isolated from the Salar del Huasco (North of Chile, 20° S) at different conditions of temperature, light and nutrient
Provedor de dados: 73
Autores: RAMÍREZ,EIMMY E.; GONZÁLEZ,MARIELA A.; CIFUENTES,ANA S.; INOSTROZA,INGRID; URRUTIA,ROBERTO E.
Benthic diatoms are cultured usually under laboratory conditions to be used as a food source for other organisms, of aquaculture interest or for biotechnological applications. Laboratory experiments demonstrate the incidence of the physical and chemical variables on abundance and growth rates of diatoms. While macronutrients are usually selected and dosed into common culture mediums to meet the general requirements of a wide range of diatoms, the availability and optimization of micronutrients are more susceptible to each organism&amp;#8217;s particular physiological conditions. The aim of this study was to characterize the growth of two species of benthic diatoms isolated from the Salar de Huasco in batch cultures at different conditions of temperature...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200001

Culture conditions for the production of a-galactosidase by Aspergillus parasiticus MTCC-2796: a novel source
Provedor de dados: 69
Autores: Shivam,Kumar; Tripathi,Chandra Prakash Mani; Mishra,Sarad Kumar.
Aspergillus parasiticus microbial type culture collection (MTCC)-2796, a new source of a-galactosidase is an efficient producer of enzyme in basic medium under submerged fermentation conditions. Maximum a-galactosidase production (156.25 Uml-1) was obtained when the basic medium is supplemented with galactose (0.5% w/v) and raffinose (0.5% w/v) as carbon source and yeast extract as nitrogen source. Enzyme production was also enhanced considerably in the presence of wheat bran (1.0% w/v). Enzyme secretion was strongly inhibited by the presence of Hg2+, Cu2+, and Co2+ in the medium and to some extent by Zn2+ and Ni2+, while marginal increase in the enzyme production was observed when Mg2+ and Mn2+ were added in the medium. Among amino acids checked...
Tipo: Journal article
Palavras-chave: Aspergillus parasiticus; A-galactosidase; Culture condition; Submerged fermentation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400004

Culture medium composition affects the gene expression pattern and in vitro development potential of bovine somatic cell nuclear transfer (SCNT) embryos
Provedor de dados: 48
Autores: Arias,María E; Ross,Pablo J; Felmer,Ricardo N.
Different culture systems have been studied that support development of somatic cell nuclear transfer (SCNT) embryos up to the blastocyst stage. However, the use of sequential and two-step culture systems has been less studied. The objective of the present study was to examine the developmental potential and quality of bovine SCNT embryos cultured in different two-step culture media based on KSOM, SOF and the macromolecules FBS and BSA (K-K/FBS, K-S/BSA and K-K/BSA, respectively). No differences were observed in the cleavage rate for any of the culture systems. However, there was a significant difference (P&lt;0.01) in the rate of blastocyst development, with the K-K/ FBS culture system yielding a higher rate of blastocysts (28%) compared to other...
Tipo: Journal article
Palavras-chave: Cattle; Gene expression; KSOM; Nuclear transfer embryos; SOF.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400016

Curcumin restores mitochondrial functions and decreases lipid peroxidation in liver and kidneys of diabetic db/db mice
Provedor de dados: 48
Autores: Soto-Urquieta,María G; López-Briones,Sergio; Pérez-Vázquez,Victoriano; Saavedra-Molina,Alfredo; González-Hernández,Gloria A; Ramírez-Emiliano,Joel.
BACKGROUND: Nitrosative and oxidative stress play a key role in obesity and diabetes-related mitochondrial dysfunction. The objective was to investigate the effect of curcumin treatment on state 3 and 4 oxygen consumption, nitric oxide (NO) synthesis, ATPase activity and lipid oxidation in mitochondria isolated from liver and kidneys of diabetic db/db mice. RESULTS: Hyperglycaemia increased oxygen consumption and decreased NO synthesis in liver mitochondria isolated from diabetic mice relative to the control mice. In kidney mitochondria, hyperglycaemia increased state 3 oxygen consumption and thiobarbituric acid-reactive substances (TBARS) levels in diabetic mice relative to control mice. Interestingly, treating db/db mice with curcumin improved or...
Tipo: Journal article
Palavras-chave: Diabetes; Mitochondria; Curcumin; ATPase activity; Nitric oxide synthesis; Lipid oxidation.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100068

Curital INIA: Nueva Variedad de Zapallo Italiano (Cucurbita pepo L.) del Tipo Negro Chileno
Provedor de dados: 113
Autores: Bascur B.,Gabriel.
El zapallo italiano (Cucurbita pepo L.) tipo “Negro Chileno” es el más cultivado en Chile; su fruto de forma cónica, alargada, de color verde oscuro, con la presencia de estrías longitudinales de color verde claro. Presenta una gran desuniformidad en las características de planta y fruto, y es de bajo potencial productivo. La escasa disponibilidad de variedades comerciales de este tipo de zapallo, los problemas de producción y calidad que enfrenta el pequeño agricultor, y el alto costo de semilla de algunas variedades híbridas, han sido las motivaciones para realizar este trabajo de mejoramiento genético, en el Centro Regional de Investigación La Platina del Instituto de Investigaciones Agropecuarias. A partir de selecciones hechas en cultivos comerciales...
Tipo: Journal article
Palavras-chave: Líneas puras; Mejoramiento; Rendimiento.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000400012

Current and potential distribution areas for Nothofagus alessandrii, an endangeredtree species from central Chile
Provedor de dados: 118
Autores: Santelices,Rómulo; Drake,Fernando; Mena,Carlos; Ordenes,Rodrigo; Navarro-Cerrillo,Rafael M.
Nothofagus alessandrii ("ruil") is an endangered species native to the Maule Coastal Forest of central Chile. Previous studies have demonstrated that the current distribution of this species and rates of deforestation and fragmentation present a serious threat to the species. To address this threat, spatial and temporal variation in remnant "ruil" forest cover was analyzed for the period from 1991 to 2008. Using aerial photography and geomatic tools, the state of "ruil" forests cover in 1991 was compared to the "ruil" forests cover in 2008 and with this information, the potential distribution area of this species was calculated. The results demonstrate that the current area of "ruil" forest is approximately 314 ha, with a net loss of 42 ha (12% of the...
Tipo: Journal article
Palavras-chave: Deforestation; Forest tree; Nothofagus alessandrii; Potential distribution; Ruil; Spatial distribution.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300011

Current state of and perspectives on cocoa production in Mexico
Provedor de dados: 118
Autores: Díaz-José,Oscar; Aguilar-Ávila,Jorge; Rendón-Medel,Roberto; Santoyo-Cortés,V. Horacio.
O. Díaz-José, J. Aguilar-Ávila, R. Rendón-Medel, and V.H. Santoyo-Cortés. 2013. Current state of and perspectives on cocoa production in Mexico. Cien. Inv. Agr.40(2): 279-289. Cocoa is one of the principal agricultural and cultural resources of the humid Mexican tropics. At present, the cocoa system is facing an unprecedented production crisis in relation to several factors, including the presence of frosty pod rot (Moniliophthora roreri), plantation neglect and low farm profitability. The aim of this study was to formulate a medium-term plan for cocoa production in Mexico by constructing a Technology Roadmap (TRM). Using an econometric model, production statistics were analyzed for national and international data. Producers participated in 185 surveys,...
Tipo: Journal article
Palavras-chave: Cocoa; Mexican cocoa; Frosty pod rot; Technology roadmap; Theobroma cacao.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200004

CURRICULUM VITAE
Provedor de dados: 97
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000024

CURVA DE CRESCIMENTO E MARCHA DE ABSORÇÃO DE MACRONUTRIENTES EM TRÊS CULTIVARES DE AMOREIRA (Morus alba L)
Provedor de dados: 127
Autores: Vale,Diego Wyllyam do; Prado,Renato de Mello; Gondim,Ancélio Ricardo Oliveira; Takahashi,Roque; Correia,Marcus Andre Ribeiro.
Com objetivo de avahar o crescimento e a marcha de absorção de nutrientes (N, P, K, Ca, Mg e S) em três cultivares de amoreira (tratamentos), colheu-se quatro plantas por tratamento, em diferentes estadios fenológicos. O delineamento experimental utilizado foi inteiramente casualizado, em esquema fatorial 3x5 em 3 repeticSes. As cultivares usadas foram 'FM Shima-Miura', TZ 56/4' e 'Miura' e estabelecido cinco épocas de colheita da biomassa 45; 60; 75; 90 e 115 dias após a cepa. Observou-se que o acumulo de nutrientes apresentou comportamento diferente e a cv. IZ 56/4 foi superior comparado com às cv. PM Shima-Miura para N, P, K, Ca, Mg e S e Miura para N, P, K e S. Por exemplo, o acumulo de N em mg por planta-1 planta de amoreira das cultivares PM...
Tipo: Journal article
Palavras-chave: Nutrição mineral; Acumulo de nutrientes; Exigência nutritional.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000100001

Cutinase structure, function and biocatalytic applications
Provedor de dados: 69
Autores: Carvalho,Cristina M. L.; Aires-Barros,Maria Raquel; Cabral,Joaquim M. S.
This review analyses the role of cutinases in nature and their potential biotechnological applications. The cloning and expression of a fungal cutinase from Fusarium solani f. pisi, in Escherichia coli and Saccharomyces cerevisiae hosts are described. The three dimensional structure of this cutinase is also analysed and its function as a lipase discussed and compared with other lipases. The biocatalytic applications of cutinase are described taking into account the preparation of different cutinase forms and the media where the different types of enzymatic reactions have been performed, namely hydrolysis, esterification, transesterification and resolution of racemic mixtures. The stability of cutinase preparations is discussed, particularly in anionic...
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000300006

Cyamella in Man - Its Morphology and Review of Literature
Provedor de dados: 77
Autores: Reddy,Sreenivasulu; Vollala,Venkata Ramana; Rao,Rajashekar.
A sesamoid bone is a little bone embedded in a joint capsule or tendon. We observed a very rare sesamoid bone (cyamella) in the popliteus muscle of a 48 - year - old male cadaver. Further, the related literature is reviewed and the probable functions, morphology and clinical significance of the variation are discussed
Tipo: Journal article
Palavras-chave: Cadaver; Cyamella; Popliteus muscle; Sesamoid bone.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200024

Cyanobacterial defense mechanisms against foreign DNA transfer and their impact on genetic engineering
Provedor de dados: 48
Autores: Stucken,Karina; Koch,Robin; Dagan,Tal.
Cyanobacteria display a large diversity of cellular forms ranging from unicellular to complex multicellular filaments or aggregates. Species in the group present a wide range of metabolic characteristics including the fixation of atmospheric nitrogen, resistance to extreme environments, production of hydrogen, secondary metabolites and exopolysaccharides. These characteristics led to the growing interest in cyanobacteria across the fields of ecology, evolution, cell biology and biotechnology. The number of available cyanobacterial genome sequences has increased considerably in recent years, with more than 140 fully sequenced genomes to date. Genetic engineering of cyanobacteria is widely applied to the model unicellular strains Synechocystis sp. PCC 6803...
Tipo: Journal article
Palavras-chave: Cyanobacteria; Genetic engineering; Defense mechanism; Restriction-modification.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400009

CYANOPHYCEAE, EUGLENOPHYCEAE, CHLOROPHYCEAE, ZYGNEMATOPHYCEAE Y CHAROPHYCEAE EN ARROZALES DE CHILE
Provedor de dados: 73
Autores: Pereira,Iris; Reyes,Guissella; Kramm,Víctor.
Se realizó un estudio taxonómico de ciertos grupos de algas en algunos arrozales de Chile provenientes de 15 localidades comprendidas entre la VI y VIII regiones. Se analizó un total de 31 muestras colectadas en enero de 1997. Se determinó un total de 40 taxa: 5 Cyanophyceae, 11 Euglenophyceae, 6 Chlorophyceae, 16 Zygnematophyceae y 2 Charophyceae. De estos 40 taxa, 9 corresponden a nuevas citas para Chile y se extiende la distribución de 22 taxa en el país. En este trabajo no se incluyen las Bacillariophyceae (diatomeas). Las malezas algales más desarrolladas en los arrozales fueron Nitella acuminata, seguida de Chara braunii y en menor grado algas filamentosas de los órdenes Oedogoniales y Zygnematales.
Tipo: Journal article
Palavras-chave: Malezas algales; Campos arroceros; Aguas dulces lénticas.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100003

Cyclodextrin glucanotransferase immobilization onto functionalized magnetic double mesoporous core-shell silica nanospheres
Provedor de dados: 69
Autores: Ibrahim,Abdelnasser S.S.; Al-Salamah,Ali A; El-Toni,Ahmed Mohamed; El-Tayeb,Mohamed A; Elbadawi,Yahya B.
Background Cyclodextrin glucanotransferase (CGTase) from Amphibacillus sp. NPST-10 was covalently immobilized onto amino-functionalized magnetic double mesoporous core-shell silica nanospheres (mag@d-SiO2@m-SiO2-NH2), and the properties of the immobilized enzyme were investigated. The synthesis process of the nanospheres included preparing core magnetic magnetite (Fe3O4) nanoparticles, coating the Fe3O4 with a dense silica layer, followed by further coating with functionalized or non-functionalized mesoporous silica shell. The structure of the synthesized nanospheres was characterized using TEM, XRD, and FT-IR analyses. CGTase was immobilized onto the functionalized and non-functionalized nanospheres by covalent attachment and physical adsorption. Results...
Tipo: Journal article
Palavras-chave: Amphibacillus sp; Cyclodextrin glucanotransferase; Cyclodextrins; Double mesoporous core-shell silica nanospheres; Immobilization.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000200001

Cyclooxygenase-2 and hypoxia-regulated proteins are modulated by basic fibroblast growth factor in acute renal failure
Provedor de dados: 48
Autores: Villanueva,Sandra; Escobar,Pía; Jacubovsky,Ioram; Irarrázabal,Carlos; Carreño,Juan E; Erpel,José M; Céspedes,Carlos; González,Alexis A; Vio,Carlos P; Velarde,Victoria.
Acute renal failure (ARF) can be caused by injuries that induce tissue hypoxia, which in turn can trigger adaptive or inflammatory responses. We previously showed the participation of basic fibroblast growth factor (FGF-2) in renal repair. Based on this, the aim of this study was to analyze the effect of FGF-2 signaling pathway manipulation at hypoxia-induced protein levels, as well as in key proteins from the vasoactive systems of the kidney. We injected rat kidneys with FGF-2 recombinant protein (r-FGF) or FGF-2 receptor antisense oligonucleotide (FGFR2-ASO) after bilateral ischemia, and evaluated the presence of iNOS, EPO and HO-1, in representation of hypoxia-induced proteins, as well as COX-2, renin, kallikrein, and B2KR, in representation of the...
Tipo: Journal article
Palavras-chave: ARF; COX-2; FGF-2; Kidney regeneration.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000100007

Cyclophosphamide Effect on the Epithelial Covering of Rats Fetuse's Tongue: A Morphometric Study
Provedor de dados: 77
Autores: De Lucia,M. B. I.; Azoubel,R.
The present study has the aim to describe morphologically, morphometrically and stereologically some changes in the tongue epithelium of rat fetuses under the effect of cyclosphosphamide. This drug was used in a single 6mg/kg according to the body weight in the tenth ­ pregnancy day while the control group received equal dosage of saline solution by the same duct and in the same day of pregnancy. The fetuses were plunged into fixed solution of Bouin for five days and the heads of then were divided and blocked in paraffin. Histological sections of six-micrometer thickness were performed and then colored with hematoxilin and eosin. It was used morphometrical and stereological analysis after the morphological study. The data were submitted under the...
Tipo: Journal article
Palavras-chave: Cyclophosphamide; Teratology; Tongue.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200002

Cyclosporin A-treated Dendritic Cells may affect the outcome of organ transplantation by decreasing CD4+CD25+ regulatory T cell proliferation
Provedor de dados: 48
Autores: Pino-Lagos,Karina; Michea,Paula; Sauma,Daniela; Alba,Andrea; Morales,Jorge; Bono,María Rosa; Fierro,Alberto; Rosemblatt,Mario.
One of the mechanisms for generation of tolerance involves immature dendritic cells (DCs) and a subpopulation of regulatory CD4+ CD25+ T lymphocytes (T REG). The purpose of this work was to analyze how Cyclosporine A (CsA), a widely used immunosuppressive drug, may affect T REG proliferation. Purified and activated murine DCs obtained from bone marrow precursors differentiated with rGMCSF were co-cultured with purified CFSE-labeled T REG from OTII mice, and their phenotype and proliferation analyzed by flow cytometry. Our data indicate that DCs differentiated in the presence of CsA show an altered phenotype, with a lower expression of MHC-II and a lower activating capacity. Additionally, these CsA-treated DCs show decreased production of IL-2 and IL-12 and...
Tipo: Journal article
Palavras-chave: CD4+CD25+ regulatory T cell; Cyclosporine A; Dendritic cells; Transplant tolerance.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300010

CYCLOTELLA OCELLATA PANTOCSEK (BACILLARIOPHYCEAE): PRIMERA CITA EN CHILE Y COMENTARIOS SOBRE SU VARIABILIDAD MORFOLOGICA
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola; Vila,Irma.
Cyclotella ocellata Pantocsek es señalada por primera vez para las aguas continentales de Chile, encontrada en una muestra recolectada en el embalse Rapel (34º02'S, 71º35'W). Se entrega una descripción de la especie y comentarios relacionados con su variabilidad morfológica
Tipo: Journal article
Palavras-chave: Cyclotella ocellata; Diatomeas; Rapel; Stephanodiscaceae.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200007

Cystadenocarcinoma Arising from Ovary in a Three Year Old Doberman Bitch
Provedor de dados: 77
Autores: Ajadi,A. Temitope; Antia,E. Richard; Akang,E. Effiong.
A three- year- old Doberman was presented with complaint of lethargy and weight- loss. Physical examination revealed a mass in the right abdomen. Laboratory abnormalities included anaemia, azotaemia and metabolic acidosis. Sonogram of the mass was an anaechoic area surrounded by hypoechoic tissue. The mass was located between the right kidney and ovary and showed papillary and tubular pattern of cystadenocarcinoma. Nephroureterectomy and ovariohysterectomy was performed; however bitch was euthanized owing to poor improvement, while necropsy of the left kidney revealed an end-stage kidney. It was concluded that the cystadenocarcinoma must have arisen secondary to a primary ovarian adenocarcinoma through stromal invasion.
Tipo: Journal article
Palavras-chave: Ovary; Cystadenocarcinoma; Doberman; Dog.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300055

Cysteine-Rich Secretory Proteins (CRISP) and their role in mammalian fertilization
Provedor de dados: 48
Autores: Cohen,Débora J; Maldera,Julieta A; Weigel Muñoz,Mariana; Ernesto,Juan I; Vasen,Gustavo; Cuasnicu,Patricia S.
Epididymal protein CRISPI is a member of the CRISP (Cysteine-RIch Secretory proteins) family and is involved in sperm-egg fusion through its interaction with complementary sites on the egg surface. Results from our laboratory have shown that this binding ability resides in a 12-amino-acid region corresponding to a highly conserved motif of the CRISP family, named Signature 2 (S2). In addition to this, our results revealed that CRISP1 could also be involved in the previous step of sperm binding to the zona pellucida, identifying a novel role for this protein in fertilization. As another approach to elucidate the participation of CRISP1 in fertilization, a mouse line containing a targeted disruption of CRISP1 was generated. Although CRISP1-deficient mice...
Tipo: Journal article
Palavras-chave: Sperm; Gamete fusion; CRISP; Egg; Fertilization.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000200004

Cytoarchitectural Variations in the Ovary, Oviduct and Uterus Following Intra-Gastric Gavages of Abrus precatorius Linn in Albino Rats
Provedor de dados: 77
Autores: Okoko,Ini-Ibehe Essien; Yama,Oshiozokhai Eboetse.
In developing countries, herbal medicines have continued to remain significant and readily patronized. Numerous plants have been used historically to reduce fertility and modern scientific research has confirmed antifertility effect in some of the herbs tested. To investigate the effects of Abrus precatorius (AP) on the histology of the ovary, oviduct and uterus of female Sprague-Dawley (S-D) rat. A total of 40, 6­8 week old 4-day cycling female S-D rats were used. They were divided into the treatment, control and reversibility groups. The treatment and reversibility groups were fed oral AP seed extract (50 mg/kg b.w) for 32 days. A fraction of the rats in reversibility group was treated with distilled water for another 32 days. The control group were used...
Tipo: Journal article
Palavras-chave: Abrus precatorius; Sprague-Dawley rat; Ovaries; Uteri; Oviducts.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400057

Cytogenetic analyses as clarifying tools for taxonomy of the genus Callisia Loefl. (Commelinaceae)
Provedor de dados: 73
Autores: GRABIELE,MARINA; DAVIÑA,JULIO R.; HONFI,ANA I.
Chromosome numbers, karyotypes and meiotic behaviour in 10 populations belonging to two species of Callisia Loefl. from Northeast Argentina have been studied. Callisia repens showed a basic number of x = 6 and that of C. monandra was x = 7. Both species were diploids and this is the first report of the chromosome numbers for Argentinean populations: C. repens, 2n = 2x = 12 and C. monandra 2n = 2x = 14. The karyotype descriptions of C. repens (2 m + 2 sm + 6 st + 2 t) and C. monandra (6 m + 4 sm + 4 st) are also reported here for the first time for both species. Chromosomes behaved regularly at meiosis, pair as bivalents and produced viable pollen in the Callisia accessions studied. Chiasmata frequency and distribution are reported and this meiotic analysis...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100005

Cytogenetics of Chilean angiosperms: Advances and prospects
Provedor de dados: 97
Autores: JARA-SEGUEL,PEDRO; URRUTIA,JONATHAN.
Cytogenetic data on Chilean angiosperms have been reported since at least eight decades ago; however, much of this information is disperse in diverse sources and is not readily available as a comprehensive document that allows having a general vision on advances and gaps in this matter. The goal of this paper is to summarize the advances and prospets on cytogenetic studies of the Chilean angiosperms based on compiled publications from 1929 to 2010. We found 78 publications supplied by four groups of Chilean researchers and some foreign specialists. Cytogenetic data have been reported for 139 Chilean angiosperm species (2.8 % of the total), which belong to 58 genera and 34 families. During 2001-2010 there was an increase in the number of publications, being...
Tipo: Journal article
Palavras-chave: Chromosome banding; Chromosome number; Genome size; Karyotype morphology.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000100001

Cytohesins and centaurins control subcellular trafficking of macromolecular signaling complexes: Regulation by phosphoinositides and ADP-Ribosylation Factors
Provedor de dados: 48
Autores: HAWADLE,MUHAMED A.; FOLARIN,NAJEEM; MARTIN,ROSEMARY; JACKSON,TREVOR R.
The ADP-ribosylation factor family of small GTP-binding proteins are implicated in the regulation of vesicular transport and control of cytoskeletal and cell adhesion events. The phosphoinositide 3-kinase, phosphoinositide 4-P 5-kinase and phospholipase D signaling pathways are major regulators of ARF signaling cascades. Two families of ARF regulatory molecules, the cytohesin ARF-Guanine nucleotide Exchange Factors and the centaurin GTPase-Activating Proteins provide key targets for the action of these lipid signals. A critical feature of the regulation of ARF signaling is coordinated recruitment of exchange factors, ARFs and GAPs to appropriate subcellular locations. These complexes drive repetitive cycles of ARF activation and membrane association that...
Tipo: Journal article
Palavras-chave: ADP-ribosylation factor Cytohesin; Centaurin GTPase Activating Protein Guanine nucleotide Exchange Factor Phosphoinositide.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000200017

Cytokinin preconditioning enhances multiple shoot regeneration in Pongamia pinnata (L.) Pierre - a potential, non-edible tree seed oil source for biodiesel
Provedor de dados: 69
Autores: Belide,Srinivas; Sajjalaguddam,Ramgopal Rao; Paladugu,Anitha.
An efficient, highly reproducible protocol for multiple shoot induction and plant regeneration of Pongamia pinnata has been successfully developed using cotyledonary node explants. This study also demonstrates that preconditioning of explant stimulates production of multiple shoots from cotyledonary nodes of P. pinnata. The highest direct shoot regeneration (90%) with an average of 18.4 ï¿½ 3.1 shoots/explant were obtained when cotyledonary node explants were excised from seedlings germinated on Murashige and Skoog (MS) media supplemented with benzyladenine (BA) 1 mg l-1, and subsequently cultured on MS media with 1 mgl-1 thidiazuron (TDZ). Scanning electron microscope observations of cotyledonary node (CN) explants excised from pre-conditioned and normal...
Tipo: Journal article
Palavras-chave: Benzyladenine; Cotyledonary node; Multiple shoot induction; Scanning electron microscopy; Thidiazuron.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600003

Cytological Aspects of the Differentiation of Barb Cells During the Formation of the Ramus of Feathers
Provedor de dados: 77
Autores: Alibardi,Lorenzo.
The present ultrastructural study on developing and regenerating feathers of chick and zebrafinch describes the ultrastructural changes that occur during the differentiation of barb cells that leads to the formation of the ramus of barbs. Differently from barbule and barb cortical cells that accumulate feather keratin, barb medullary cells undergo to lipid degeneration. Eventually, lipids disappear and medullary cells become empty cavities in the central part of the ramus. In barb medullary cells feather keratin is accumulated in few peripheral bundles that merge with those of cortical cells to fom the wall of the ramus. The latter is joined with branching barbules. The process that controls the transition from keratin-synthesizing to lipid-producing barb...
Tipo: Journal article
Palavras-chave: Feathers; Barbs; Differentiation; Lipidization; Ultrastructure.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100010

Cytological investigations on populations of Taraxacum (Asteraceae) from the Juan Fernandez Archipelago, Chile
Provedor de dados: 73
Autores: Baeza,Carlos; Bastías,Cristián; Stuessy,Tod; Ruiz,Eduardo; Greimler,Josef; López-Sepulveda,Patricio; Peñailillo,Patricio; Novoa,Patricio; Gatica,Alejandro.
Durante una expedición al Archipiélago de Juan Fernández, Chile, en febrero de 2011, se recolectaron semillas de Taraxacumfernandezianum Dahlst. provenientes de las islas Robinson Crusoe y Alejandro Selkirk. Se realizó un análisis citológico de las dos poblaciones y se concluyó que ambas son triploides, con un 2n = 3x = 24 cromosomas, con una fórmula cariotípica de 18m + 3sm + 3sm-sat, esto es, 18 cromosomas metacéntricos, 3 cromosomas submetacéntricos y 3 cromosomas submetacéntricos con un satélite en el brazo largo. Coincidentemente, estas poblaciones son citológicamente idénticas a las reportadas en Japón e India para Taraxacum officinale. Sobre estos antecedentes, concluimos que desde un punto de vista citológico Taraxacum fernandezianum podría ser...
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200019

Cytomorphology of Circulating Tumor Cells and Cell Clusters in Chilean Patients with Colo-Rectal Cancer
Provedor de dados: 77
Autores: Murray,Nigel P; Vidal Albarran,R-C; Pérez O,Guillermo; Ruiz M,Amparo; Porcell E,José; Castillo A,Ana María.
The aim of this study was to determine the cytomorphological characteristics of circulating tumor cells (CTCS) in patients with colo-rectal cancer and compare them with the primary tumor and metastasis. CTCS were obtained from blood using differential gel centrifugation and detected using standard immunocytochemistry using anti-CEA. Primary CTCs were defined as those detected before surgery and secondary CTCs those detected after. Surgical specimens of the primary tumor and metastasis were evaluated using standard histological methods with hematoxillin and eosin. CTCs both primary and secondary retained the cytomorphological characteristics of the primary tumor, showing marked intra-patient pleomorphism. There were no differences between primary and...
Tipo: Journal article
Palavras-chave: Circulating tumor cells; Colo-rectal cancer; Immunocytochemistry.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300011

Cytoprotective and suicidal signaling in oxidative stress
Provedor de dados: 48
Autores: Videla,Luis A.
Oxidative stress is an imbalance between pro-oxidants and antioxidants in favor of the pro-oxidants, leading to different responses depending on the level of pro-oxidants achieved and the duration of exposure. In this article, we discuss the cytoprotective or suicidal signaling mechanisms associated with oxidative stress by addressing: (i) the development of an acute and mild pro-oxidant state by thyroid hormone administration eliciting the redox upregulation of the expression of proteins affording cell protection as a preconditioning strategy against ischemia-reperfusion liver injury; and (ii) the role of prolonged and severe oxidative stress and insulin resistance as determinant factors in the pathogenesis of non-alcoholic fatty liver disease associated...
Tipo: Journal article
Palavras-chave: Oxidative stress; Thyroid hormone; Liver preconditioning; Obesity; Insulin resistance; Non-alcoholic fatty liver disease.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300014

Cytotoxic activity of some marine brown algae against cancer cell lines
Provedor de dados: 48
Autores: KHANAVI,MAHNAZ; NABAVI,MARYAM; SADATI,NARGESS; SHAMS ARDEKANI,MOHAMMADREZA; SOHRABIPOUR,JELVE; NABAVI,SEYED MOHAMMAD B; GHAELI,PADIDEH; OSTAD,SEYED NASSER.
The aim of this study was to investigate the in vitro cytotoxic activity of total extract of MeOH (70%) and partition fractions of hexan, chloroform (CHCL3), ethylacetate (EtOAc) and MeOH-H2O of brown algae species (Sargassum swartzii, Cystoseira myrica, Colpomenia sinuosa) found in the Persian Gulf against in different cell lines including HT-29, Caco-2, T47D, MDA-MB468 and NIH 3T3 cell lines by MTT and AnnexinV-PI assay. The hexan fraction of S. swartzii and C. myrica showed selective cytotoxicity against proliferation of Caco-2 cells (IC50&lt;100 &amp;#956;g/ml) T47D cell line (IC50&lt;100 &amp;#956;g/ml), respectively. S. swartzii and C. myrica were also observed for increasing apoptosis in Caco-2 and T47D cells. Total extract and fractions of C....
Tipo: Journal article
Palavras-chave: Colpomenia sinuosa; Cystoseira myrica; Cytotoxic activity; MTT assay; Persian Gulf; Sargassum swartzii.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000100005

Cytotoxic Effect of Double Emulsion (W/O/W) CuSO4 Loaded PLA Nanoparticles on MKN-45 Gastric Adenocarcinoma Cell Line
Provedor de dados: 77
Autores: Montiel-Eulefi,E; Jara,F; Toro,C; Garcés,M; Leal,P.
Poly (L-lactic acid) (PLA) nanoparticles have the approval of the main institutions for drugs administration and therapeutics. However, the use of lactic acid polymer is controversial because lactic acid has been proposed as an energy source for cancer cells. The aim of this study was to evaluate the cytotoxic, apoptotic and cell cycle properties of PLA and CuSO4-loaded PLA biodegradable nanoparticles on MKN-45 gastric adenocarcinoma cell line. PLA nanoparticles for the delivery of the anticancer active principle CuSO4 were obtained using the double emulsion method. PLA and CuSO4 loaded PLA nanoparticles were morphologically characterized and their size determined using transmission electron microscopy (TEM). The cytotoxicity of this drug delivery system...
Tipo: Journal article
Palavras-chave: Copper loaded nanoparticles; Poly-lactic acid; Adenocarcinoma MKN45cells; Cytotoxicity; Cell cycle.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100011

Cytotoxicity and hepatoprotective attributes of methanolic extract of Rumex vesicarius L.
Provedor de dados: 48
Autores: NK,Asha Tukappa; Londonkar,Ramesh L; Nayaka,Hanumantappa B; CB,Sanjeev Kumar.
BACKGROUND: To evaluate the hepatoprotective potential and invitro cytotoxicity studies of whole plant methanol extract of Rumex vesicarius L. Methanol extract at a dose of 100 mg/kg bw and 200 mg/kg bw were assessed for its hepatoprotective potential against CCl4-induced hepatotoxicity by monitoring activity levels of SGOT (Serum glutamic oxaloacetic transaminase), SGPT (Serum glutamic pyruvic transaminase), ALP (Alkaline phosphatase), TP (Total protein), TB (Total bilirubin) and SOD (Superoxide dismutase), CAT (Catalase), MDA (Malondialdehyde). The cytotoxicity of the same extract on HepG2 cell lines were also assessed using MTT assay method at the concentration of 62.5, 125, 250, 500 &amp;#956;g/ml. RESULTS: Pretreatment of animals with whole plant...
Tipo: Journal article
Palavras-chave: Rumex vesicarius L; HepG2; MDA; SOD; CAT; CCl4 induced hepatotocixity.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100019

Cytotoxicity and trypanocidal activity of nifurtimox encapsulated in ethylcyanoacrylate nanoparticles
Provedor de dados: 48
Autores: SÁNCHEZ,GITTITH; CUELLAR,DANIELA; ZULANTAY,INES; GAJARDO,MARTA; GONZÁLEZ-MARTIN,GUILLERMO.
The aim of the present study was to study the trypanocidal activity of nanoparticles loaded with nifurtimox in comparison with the free drug against Trypanosoma cruzi, responsible for Chagas' disease. Ethylcyanoacrylate nanoparticles acted as the delivery system into cells. As the obligate replicative intracellular form is amastigote, in vitro studies were performed on this form of parasite as well as on cell culture derived trypomastigotes. The fluorescence method used here was very useful as it allowed for the simultaneous study of trypanocide activity and cytotoxicity by determining living or dead parasites within living or dead host cells. According to these results, the greatest trypanocide activity on cell culture-derived trypomastigotes was recorded...
Tipo: Journal article
Palavras-chave: Nifurtimox; Nanoparticles; Amastigotes; Trypomastigotes; Trypanosoma cruzi.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000100007

Cytotoxicity, nitric oxide and acetylcholinesterase inhibitory activity of three limonoids isolated from Trichilia welwitschii (Meliaceae)
Provedor de dados: 48
Autores: Dzoyem,Jean P.; Tsamo,Armelle T.; Melong,Raduis; Mkounga,Pierre; Nkengfack,Augustin E.; McGaw,Lyndy J.; Eloff,Jacobus N.
BACKGROUND: Limonoids are highly oxygenated compounds with a prototypical structure. Their occurrence in the plant kingdom is mainly confined to plant families of Meliaceae and Rutaceae. Owing to their wide range of pharmacological and therapeutic properties, this study was aimed at investigating the potential nitric oxide (NO) and acetylcholinesterase (AChE) inhibitory activity and the cytotoxicity of three limonoids: trichilia lactone D5 (1), rohituka 3 (2) and dregeanin DM4 (3), isolated from Trichilia welwitschii C.DC RESULTS: Results indicated that the three limonoids had low cytotoxicity towards Vero cells with LC50 values ranging from 89.17 to 75.82 (&amp;#956;g/L. Compounds (2) and (3) had lower cytotoxicity compared to puromycin and doxorubicin...
Tipo: Journal article
Palavras-chave: Trichilia welwitschii; Cytotoxicity; Acetylcholinesterase; Nitric oxide; Limonoids.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100057

Daily and seasonal limits of time and temperature to activity of degus
Provedor de dados: 97
Autores: KENAGY,G.J.; NESPOLO,ROBERTO F.; VÁSQUEZ,RODRIGO A.; BOZINOVIC,FRANCISCO.
We present an analysis of behavioral flexibility in a day-active caviomorph rodent, the degu, Octodon degus, in response to temporal (daily and seasonal), spatial, and thermal heterogeneity of its environment. We quantified activity and foraging behavior in a population, together with thermal conditions, in an open habitat in the seasonally hot and arid matorral of central Chile. Summer activity was bimodal, with a gap of more than 8 h between the morning bout of 2.5 h of intensive foraging and the afternoon bout of 2 h. More than half of the 4.5 h of summer activity occurred in the shade of early morning or late afternoon when the sun was below the local skyline. Autumn and spring activity were also bimodal, but with greater proportions of activity under...
Tipo: Journal article
Palavras-chave: Foraging; Seasonality; Thermal ecology; Forrajeo.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000300008

Danko Brncic and the flower-flies
Provedor de dados: 97
Autores: CARSON,HAMPTON L.
This is a personal essay commemorating Brncic as a keen naturalist/evolutionist in the best Darwinian sense. His innate curiosity, so important in a scientist, led him to the discovery of cenain unique drosophilid flies in Chile. The life cycle of one species of flower-fly (Drosophila flavopilosa) is of special interest. Females oviposit in fresh flowers of a solanaceous plant that is widespread in Chilean valleys. Twenty years of combined ecological and genetic work, carried out on this species, pioneers the use of a highly specialized Drosophila species in the study of population genetics and evolution. Many eco-genetic features are revealed that are important supplements to observations made on the widely-studied generalist species of the genus
Tipo: Journal article
Palavras-chave: Flower-breeding Drosophila; Genetic specialization; Ecology; Population genetics; Evolution.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000008

Danko Brncic: reminiscencias
Provedor de dados: 97
Autores: KOREF-SANTIBÁÑEZ,SUSI.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000004

Danko Brncic y la coadaptación
Provedor de dados: 97
Autores: ROTHHAMMER,FRANCISCO; MANRÍQUEZ,GERMÁN.
El concepto de coadaptación es antiguo en biología. &lt;A HREF="#DARWIN"&gt;Darwin (1859)&lt;/A&gt; se refiere a la "gran cantidad de complejas e indispensables coadaptaciones estructurales existentes entre un ser orgánico y otro". El concepto también fue utilizado por &lt;A HREF="#DOBZHANSKY37"&gt;Dobzhansky (1937)&lt;/A&gt;, por &lt;A HREF="#MATHER43"&gt;Mather (1943)&lt;/A&gt; y por &lt;A HREF="#MATHER49"&gt;Mather &amp;amp; Harrison (1949)&lt;/A&gt;. Cuando Brncic llegó a Nueva York a trabajar al laboratorio de Dobzhansky, la coadaptación era ampliamente aceptada como mecanismo de mantención de variación genética en poblaciones y formaba parte del modelo balancista cuyo máximo exponente era precisamente este genetista. A comienzos de la década de 1950...
Tipo: Journal article
Palavras-chave: Danko Brncic; Complejos genéticos coadaptados; Mantención de variación genética.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000021

DANTHONIA DECUMBENS(DANTHONIAE, POACEAE), NUEVA ESPECIE ADVENTICIA PARA LA FLORA DE CHILE CONTINENTAL
Provedor de dados: 73
Autores: Rúgolo de Agrasar,Zulma E; García,Nicolás; Mieres,Gustavo.
This article reports the finding of Danthonia decumbens (L.) DC. in the surrounding of Puerto Montt(41°26' S;73°05' W) in the south of Chile, which also constitutes the first register of this European grass in South America.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100009

Darwin, and the role of theories in evolutionary thinking
Provedor de dados: 97
Autores: MANRÍQUEZ,GERMÁN.
The section "Special Features" is dedicated to share with its readers thematic works about natural history, ecology and evolution. In this introduction we focus on the role that theories play in the construction of evolutionary thinking. First, we briefly show the importance of Lamarck's work in the context of pre-Darwinian theories about organic evolution. Then, the main components of the Darwinian theoretical core and its postDarwinian extensions are thoroughly discussed. Finally the essays following this introduction in the present issue are summarized.
Tipo: Journal article
Palavras-chave: Darwin; Evolutionary thinking; Theories.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000400001

Darwin taxonomist: Barnacles and shell burrowing barnacles
Provedor de dados: 97
Autores: CASTILLA,JUAN CARLOS.
This bibliographic review revisits circumstances in which the wharf, shell burrowing barnacle, Cryptophialus minutus, was first collected by Charles Darwin in southern Chile, in 1836. Further, explores how its collection marked Darwin's taxonomical interest in Cirripedia. A short review analyzes the initial number of extant species of Cirripedia, as described by Darwin and the present situation, with emphasis on recent collections of C. minutus in the southern tip of South America.
Tipo: Journal article
Palavras-chave: Chile; Darwin; Dwarf barnacles; Shell burrowing barnacles.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400002

DATA FUSION OF SPOT PAN IMAGES AND LANDSAT TM FOR MAPPING RIO TAVARES'MANGROVE IN SANTA CATARINA ISLAND-BRAZIL
Provedor de dados: 72
Autores: Pellerin,Joel; Pinto Camargo,Lucia; Neves Panitz,Clarice Maria.
With the availability of multisensor, multitemporal, multiresolution and multifrequency image data from operational Earth observation satellites the fusion of digital image data has become a valuable tool in remote sensing image evaluation. In this paper a new multispectral image wavelength representation is introduced of the integrated Landsat Thematic Mapper TM and Spot HRV Pan data to establish river Tavares' Mangrove vegetation classification in Santa Catarina Island - Brazil. The combining of data from these different sensors is necessary for preserving spatial integrity of the higher-resolution data (PAN) set spectral information and of the lower resolution components in (TM). The fusion of these different data contributed to the understanding of the...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300029

Data mining and influential analysis of gene expression data for plant resistance gene identification in tomato (Solanum lycopersicum)
Provedor de dados: 69
Autores: Torres-Avilés,Francisco; Romeo,José S; López-Kleine,Liliana.
Background Molecular mechanisms of plant-pathogen interactions have been studied thoroughly but much about them is still unknown. A better understanding of these mechanisms and the detection of new resistance genes can improve crop production and food supply. Extracting this knowledge from available genomic data is a challenging task. Results Here, we evaluate the usefulness of clustering, data-mining and regression to identify potential new resistance genes. Three types of analyses were conducted separately over two conditions, tomatoes inoculated with Phytophthora infestans and not inoculated tomatoes. Predictions for 10 new resistance genes obtained by all applied methods were selected as being the most reliable and are therefore reported as potential...
Tipo: Journal article
Palavras-chave: Classification; Data mining; Functional gene prediction; GEE models; Gene expression data; Plant immunity genes.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000200004

Database integration with the Web for biologists to share data and information
Provedor de dados: 69
Autores: Xia,Yulu; Stinner,Roland E.; Chu,Ping-Chu.
The Internet has fundamentally changed the way we conduct our business. Even 10 years ago or so, it was not possible to order a book or access a sequence database in another continent using the computer in our office. All these become possible due to the progress in information technology. It is especially important for biologists to realise that information technology has brought us enormous opportunities in sharing our data. In this paper, authors review and introduce the technologies relating to biological data, database, dynamic integration of databases with the World Wide Web (Web hereafter), and data standardisation.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200010

DATOS SOBRE LA FLORA VASCULAR DEL DESIERTO COSTERO DE ARICA Y TARAPACA, CHILE, Y SUS RELACIONES FITOGEOGRAFICAS CON EL SUR DE PERU
Provedor de dados: 73
Autores: Pinto,Raquel; Luebert,Federico.
Se reportan 156 nuevos registros para la flora vascular del desierto costero del norte de Chile (18°38'- 21°20'S), de los que uno es nuevo para Chile (Tetragonia crystallina) y 23 son nuevos límites de distribución. Listados florísticos de tres localidades costeras del extremo norte de Chile (cerro Camaraca, Punta Madrid, caleta Junín) son informados por primera vez. Con estos nuevos registros, la flora vascular del desierto costero de las Regiones de Arica y Parinacota, y de Tarapacá queda formada por 116 especies, lo que supone la adición de 33 especies en relación con los estudios previos. Un análisis de similitud florística entre las localidades estudiadas, junto con información proveniente de la literatura para la flora de otras localidades en el...
Tipo: Journal article
Palavras-chave: Ambientes áridos; Desierto de Atacama; Formación de Lomas; Vegetación.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100004

Datura Genus Weeds as an Epidemiological Factor of Alfalfa mosaic virus (AMV), Cucumber mosaic virus (CMV), and Potato virus Y (PVY) on Solanaceus Crops
Provedor de dados: 113
Autores: Ormeño,Juan; Sepúlveda,Paulina; Rojas,Ricardo; Araya,Jaime E.
Plant samples of jimsonweed (Datura stramonium L.) and thornapple (D. ferox L.) were collected to determine the presence of Cucumber mosaic virus (CMV), Alfalfa mosaic virus (AMV), and Potato virus Y (PVY) in Santiago, Chile (33º34’ S lat, 70º38’ W long, altitude 625 mosl), using double stranded RNA (dsRNA) analysis and ELISA. Both weeds were positive to the three types of virus with a percentage of infection ranging from 20-30% except for PVY infection in D. stramonium with an incidence of 5%. Under controlled conditions, the aphid Myzus persicae (Sulzer) transmitted CMV from D. ferox to tomatoes (Lycopersicon esculentum Mill.) and sweet peppers (Capsicum annuum L.), but did not transfer it to potatoes (Solanum tuberosum L.). Seeds of positive D....
Tipo: Journal article
Palavras-chave: AMV; CMV; PVY; Epidemiology.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000400001

Daucus carota as a novel model to evaluate the effect of light on carotenogenic gene expression
Provedor de dados: 48
Autores: STANGE,CLAUDIA; FUENTES,PAULINA; HANDFORD,MICHAEL; PIZARRO,LORENA.
Carotenoids are synthesized in prokaryotic and eukaryotic organisms. In plants and algae, these lipophilic molecules possess antioxidant properties acting as reactive oxygen species scavengers and exert functional roles in hormone synthesis, photosynthesis, photomorphogenesis and in photoprotection. During the past decade almost all carotenogenic genes have been identified as a result of molecular, genetic and biochemical approaches utilizing Arabidopsis thaliana as the model system. Studies carried out in leaves and fruits of A. thaliana and tomato determined that light regulates carotenoid biosynthesis preferentially through the modulation of carotenogenic gene transcription. In this work we showed for the first time that light induces accumulation of...
Tipo: Journal article
Palavras-chave: Carotenoid biosynthesis; Carrot; Gene expression; Light regulation.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000300006

DAVID YUDILEVICH LEVY, CAMINANTE Y VISIONARIO (1930-2006)
Provedor de dados: 48
Autores: BACIGALUPO,JUAN; DEVÉS,ROSA.
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200001

De las ciencias ecológicas a la ética ambiental
Provedor de dados: 97
Autores: ROZZI,RICARDO.
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400012

De Músculo Omohioideo a Músculo Escapulohioideo
Provedor de dados: 77
Autores: Ottone,Nicolás Ernesto; Vargas,Claudia Andrea; del Sol,Mariano.
Terminologia Anatomica se encuentra bajo constante revisión. A pesar de esto, continúan existiendo confusiones sobre el término correcto a utilizar pada cada estructura, en particular en español, ya que no existe una traducción oficial de Terminologia Anatomica en este idioma. Es conocido que el hueso antes llamado "omóplato" pasó a denominarse "escápula" pero aún no es oficial el cambio de nombre del músculo omohioideo, lo que se contrapone a una de las recomendaciones del Comité Federativo Internacional de Terminología anatómica que el término debe adaptarse al idioma vernáculo y su denominación debe concentrar la información y el papel descriptivo de la estructura en cuestión. Es por esto que hacemos un breve análisis del término M. omohyoideus...
Tipo: Journal article
Palavras-chave: Terminologia Anatomica; Escápula; Músculo omohioideo; Músculo escapulohioideo.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200056

De novo transcriptome assembly, functional annotation and differential gene expression analysis of juvenile and adult E. fetida, a model oligochaete used in ecotoxicological studies
Provedor de dados: 48
Autores: Thunders,Michelle; Cavanagh,Jo; Li,Yinsheng.
Abstract  Background  Earthworms are sensitive to toxic chemicals present in the soil and so are useful indicator organisms for soil health. Eisenia fetida are commonly used in ecotoxicological studies; therefore the assembly of a baseline transcriptome is important for subsequent analyses exploring the impact of toxin exposure on genome wide gene expression.  Results  This paper reports on the de novo transcriptome assembly of E. fetida using Trinity, a freely available software tool. Trinotate was used to carry out functional annotation of the Trinity generated transcriptome file and the transdecoder generated peptide sequence file along with BLASTX, BLASTP and HMMER searches and were loaded into a Sqlite3 database. To identify differentially expressed...
Tipo: Journal article
Palavras-chave: Earthworm; Trinity; Transcriptome; E. fetida; Ecotoxicology; RNA; Sequence; Gene expression.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100401

Death-Associated Protein Kinase is Underexpressed in High-Grade Oral Squamous Cell Carcinoma
Provedor de dados: 77
Autores: Meneses,Ismário Silva de; Souza,Rafael Reis de; Jeraldo,Verónica de Lourdes Sierpe; Cavalcante,Danielle Rodrigues Ribeiro; Reis,Francisco Prado; Albuquerque Júnior,Ricardo Luiz Cavalcanti de.
An immunohistochemical analysis of 40 cases of oral squamous cell carcinoma was performed to evaluate the relationship between the expression pattern of death-associated protein kinase (DAPk) positive cells with the histological malignancy grading of these lesions. According to our results, eleven cases (27.5%) were high-grade malignancy tumours and 29 (72.5%) were low-grade ones. We found that 92.86% of the low-grade tumours were positive to anti-DAP kinase antibody whereas only 7.14% of the high-grade tumours presented positivity, and this difference was statistically significant (p&lt;0.01). Sixteen (55.2%) of the low-grade carcinomas exhibited moderate immunoreactivity whereas ten cases (34.5%) showed weak staining and three cases (10.3%) were negative...
Tipo: Journal article
Palavras-chave: Immunohistochemistry; DAP kinase; Apoptosis; Squamous cell carcinoma.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200044

Decalcification Dynamic of Dog Mineralized Tissue by Microwaves
Provedor de dados: 77
Autores: Pitol,Dimitrius Leonardo; Issa,Joáo Paulo Mardegan; Caetano,Flávio Henrique; Lunardi,Laurelúcia Orive.
The aim of this article is to present the decalcification process dynamic of mineralized tissue in dogs, teeth and jaw, comparing the traditional decalcification method, immersion, and microwave, immersion followed by irradiation using a domestic microwave oven, accompanying the liberation of calcium through spectrophotometer of atomic absorption. It was used as decalcified agent, EDTA solution or nitric acid. The results showed that with the use of nitric acid (5%), after 15 days, the irradiated fragments could be processed for histological analysis, otherwise the tooth not irradiated need to be submerged for 65 days. The EDTA decalcified action was slower than the nitric acid. The histological observations of the irradiated samples showed an excellent...
Tipo: Journal article
Palavras-chave: Dog; Mineralized tissue; Decalcification; Microwaves; Solution.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200011

Declaration of Goiania by REDBIO/FAO: "Towards a biotechnology at the service of sustainable development of the Latin America and the Caribbean forestry and agricultural sectors"
Provedor de dados: 69
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100001

Decline of genetic variability in a captive population of Pacific white shrimp Penaeus (Litopenaeus) vannamei using microsatellite and pedigree information
Provedor de dados: 69
Autores: Vela Avitúa,Sergio; Montaldo,Hugo H; Márquez Valdelamar,Laura; Campos Montes,Gabriel R; Castillo Juárez,Héctor.
Background: The objective of this study was to estimate the decline of genetic variability and the changes in effective population size in three shrimp populations. One was a wild population collected at several points in the Mexican Pacific Ocean. The other two populations were different generations (7 and 9) from a captive population selected for growth and survival. Microsatellite markers and pedigree were both used to assess genetic variability and effective population size. Results: Using 26 loci, both captive populations showed a decline in the expected heterozygosity (20%) and allelic diversity indices (48 to 91%) compared to the wild population (P &lt; 0.05). The studied captive populations did not differ significantly from each other regarding...
Tipo: Journal article
Palavras-chave: Effective population size; Genetic diversity; Heterozygosity; Microsatellites; Selection; Shrimp.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400009

DECOMPOSITION, DYNAMIC OF INORGANIC ELEMENTS AND MICROBIAL COLONIZATION OF ARARIBÁ (Centrolobium tomentosum Guill. ex Benth) LEAVES ON LATOSOLS OF BRAZILIAN ATLANTIC FOREST
Provedor de dados: 113
Autores: Marques,Márcia S.; Sá,Nadja M.; Scotti,María R.
Leguminous trees are being planted in order to establish restoration units in the Brazilian Atlantic forest ecosystem. The success of the establishment depends on the growth, productivity of plants and litter decomposition rates. The objective of this study was to investigate the decomposition of araribá (Centrolobium tomentosum Guill. Ex Benth) leaves, at two sites. Site 1 was an experimental plantation of the native species C. tomentosum, which was inoculated with rhizobia plus mycorrhizal fungi, and Site 2 was a eucalyptus (Eucalyptus grandis W. Hill ex Maiden) forest. The leaf litter of C. tomentosum was incubated for 120, 240 and 360 days in both sites. The decomposition rate and dynamic of mineralization of the organic matter and the nutrients K, Mg,...
Tipo: Journal article
Palavras-chave: Decomposition; Eucalyptus sp.; Microbial colonization; Tropical forest; Soil fertility.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000100008

Decomposition of the Rubber Tree Hevea brasiliensis Litter at Two Depths
Provedor de dados: 117
Autores: Gréggio,Thiago Claudino; Assis,Luiz Carlos; Nahas,Ely.
The decomposition of soil litter contributes to maintaining agricultural sustainability, since the nutrients released by microbial activity are determinants of the net productivity of the agroecosystem. The decomposition of rubber tree (Hevea brasiliensis [Willd. ex A. Juss.] Müll. Arg.) leaves located on the surface and buried in at 10 cm depth in Forest and Savannah (Cerradão) soils (Oxisols) was studied, with emphasis on the production of CO2 and the monthly variation of the remaining amounts of litter mass, soluble substances, cellulose and lignin. To evaluate CO2 production, H. brasiliensis leaves were incubated for 30 days in soils from the 0-2 cm and 10-12 cm layers. CO2 production increased in the 0-2 cm layer in comparison to the 10-12 cm layer....
Tipo: Journal article
Palavras-chave: Litter mass; Cellulose; Lignin; Soluble substances; Litter-bags.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000200002

Decoupling of soil development and plant succession along a 60000 years chronosequence in Llaima Volcano, Chile
Provedor de dados: 97
Autores: GALLARDO,MARÍA-BELÉN; PÉREZ,CECILIA; NÚÑEZ-ÁVILA,MARIELA; ARMESTO,JUAN J.
Few studies have investigated the long-term evolution of nutrient limitation in ecosystems developed on volcanic soils. To approach the problem, we used "space for time substitution" to compare sites with the same state factors, except for the time elapsed since disturbance. Forests of Conguillio National Park in southern of Chile occur on volcanic soils that developed from lava flows and ash deposits of different ages originated from the activity of Llaima volcano. In this study we evaluate the patterns of change in carbon, nitrogen and phosphorus in soils and leaves, as well as changes in tree diversity and basal area along a chronosequence of volcanic substrates from 50 to 60,000 years AP (eight sites). We assessed the evolution of N and P limitation in...
Tipo: Journal article
Palavras-chave: N/P ratio; Phosphorus; Primary succession; Retrogression; Volcanic soils.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000300004

Decrease in Pupation and Adult Emergence of Plutella xylostella (L.) treated with Hexaflumuron
Provedor de dados: 117
Autores: Mahmoudvand,Mohammad; Abbasipour,Habib; Sheikhi Garjan,Aziz; Reza Bandani,Ali.
The oligophagous pest Plutella xylostella (L.) is a major crucifer pest in Tehran Province, Iran. Hexaflumuron is an insect growth regulator insecticide with good effects on immature insect stages. The objective of this study was to investigate the effects of two sublethal concentrations (LC10 and LC25) of hexaflumuron on some biological parameters of P. xylostella larvae, such as birth rate (b), death rate (d), finite rate of increase (&amp;#955;), generation time (T), sex ratio, pupation rate, and adult emergence. Results showed that hexaflumuron decreased the total number of eggs and oviposition and post-oviposition periods, pupation, and adult emergence in the treated generation, b, and &amp;#955;. Hexaflumuron also increased T, d, and the...
Tipo: Journal article
Palavras-chave: Hexaflumuron; Sublethal; Birth rate; Death rate; Oviposition period.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200007

Decreased time from seed to flowering corm size in Zephyra elegansvia in vitro cultivation
Provedor de dados: 118
Autores: Vidal,Alexis K; Han,Dong-Sheng; Nakano,Masaru; Niimi,Yoshiji.
Experiments were performed to establish a method to reduce the time from seed to flowering in Zephyra elegans. Seedlings took at least four years to produce a flowering corm. Although germination was highest in a water-agar medium, plant necrosis occurred when plants were later transferred; therefore, MS (Murashige and Skoog) medium was selected as the medium for germination. An increase in the light intensity to 9500 lux and in the pH to 6.7, significantly increased the germination rate. Eight weeks after seed germination, seedlings were transferred to MS media with sucrose concentrations of 45, 60, 75, 90 or 105 g L-1 and a pH 5.7 or 6.7, with the aim of achieving the greatest corm weight gain. After 16 weeks, the best weight gain was obtained in the MS...
Tipo: Journal article
Palavras-chave: Chilean geophyte; Corm weight gain; Flowering; Seed propagation; Zephyra elegans.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300017

Decreased VEGF-A and sustained PEDF expression in a human retinal pigment epithelium cell line cultured under hypothermia
Provedor de dados: 48
Autores: Takeyama,Masayuki; Yoneda,Masahiko; Gosho,Masahiko; Iwaki,Masayoshi; Zako,Masahiro.
BACKGROUND: Previous reports have described a decrease in retinal temperature and clinical improvement of wet age-related macular degeneration (AMD) after vitrectomy. We hypothesized that the retinal temperature decrease after vitrectomy plays a part in the suppression of wet AMD development. To test this hypothesis, we evaluated the temperature dependence of the expression of vascular endothelial growth factor-A (VEGF-A) and in vitro angiogen-esis in retinal pigment epithelium (RPE). RESULTS: We cultured ARPE-19 cells at 37, 35, 33 and 31°C and measured the expression of VEGF-A, VEGF-A splicing variants, and pigment epithelium-derived factor (PEDF). We performed an in vitro tube formation assay. The dehydrogenase activity was also evaluated at each...
Tipo: Journal article
Palavras-chave: Age-related macular degeneration (AMD); Hypothermia; Pigment epithelium-derived factor (PEDF); Retinal pigment epithelium (RPE); Vascular endothelial growth factor (VEGF); Vitrectomy.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100042

Defectos del Tubo Neural y de Labio y Paladar Hendido: un Estudio Morfológico
Provedor de dados: 77
Autores: Chávez-Corral,D. V; López-Serna,N; Levario-Carrillo,M; Sanín,L. H.
El objetivo del trabajo fue realizar una evaluación morfológica externa de recién nacidos (RN) y lactantes con diagnóstico de defectos de tubo neural (DTN) y labio hendido c/s paladar hendido (LH c/s PH) para determinar el tipo de defecto, ubicación, extensión, clasificación y evaluar la proporción de RN con retardo del crecimiento intauterino (RCIU) y lactantes desnutridos. Estudio descriptivo. Se estudiaron 36 niños desde su nacimiento hasta los 12 meses de edad; 20 con DTN y 16 con LH c/s PH. El estudio se realizó en cinco hospitales de la ciudad de Chihuahua, México. Se hizo una evaluación morfológica externa y antropometría de los niños. Los DTN se clasificaron como lesiones abiertas y cerradas, como defectos altos o bajos, según el modelo de sitios...
Tipo: Journal article
Palavras-chave: Defectos de tubo neural; Labio hendido; Paladar hendido; Retardo del crecimiento intrauterino; Desnutrición.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400025

Defense mechanisms of Solanum tuberosum L. in response to attack by plant-pathogenic bacteria
Provedor de dados: 48
Autores: POIATTI,VERA A D; DALMAS,FERNANDO R; ASTARITA,LEANDRO V.
The natural resistance of plants to disease is based not only on preformed mechanisms, but also on induced mechanisms. The defense mechanisms present in resistant plants may also be found in susceptible ones. This study attempted to analyze the metabolic alterations in plants of the potato Solanum tuberosum L. cv. Agata that were inoculated with the incompatible plant-pathogenic bacteria X. axonopodis and R. solanacearum, and the compatible bacterium E. carotovora. Levels of total phenolic compounds, including the flavonoid group, and the activities of polyphenol oxidase (PPO) and peroxidase (POX) were evaluated. Bacteria compatibility was evaluated by means of infiltration of tubers. The defense response was evaluated in the leaves of the potato plants....
Tipo: Journal article
Palavras-chave: Flavonoids; Hypersensitive response; Peroxidases; Phenolic compounds.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200009

DEFINITION AND DIAGNOSIS OF A NEW TRIBE OF SIGMODONTINE RODENTS (CRICETIDAE: SIGMODONTINAE), AND A REVISED CLASSIFICATION OF THE SUBFAMILY
Provedor de dados: 72
Autores: D'Elía,Guillermo; Pardiñas,Ulyses F. J; Teta,Pablo; Patton,James L.
A new tribe of sigmodontine rodents is formally defined and diagnosed. The tribe contains the extant genera Abrothrix (including Chroeomys), Chelemys, Geoxus, Pearsonomys, and Notiomys, a group of taxa distributed in the central and southern Andes and lowlands both east and west of the cordillera. The new tribe presents a unique combination of characters including nasals and premaxilla usually projected anterior to the incisors, moderately trumpeted; zygomatic plate with upper free border reduced or obsolete; and third upper molar reduced and sub-cylindrical in out-line with an internal ring-like enamel fossette. Molecular phylogenetic analyses indicate that Abrothrix is sister to a clade containing the remaining genera of the new tribe.
Tipo: Journal article
Palavras-chave: Abrothrix; Chelemys; Chroeomys; Geoxus; Pearsonomys; Notiomys; South America; Classification.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200007

Deformación de Branquias en Salmónidos: Análisis Macroscópico, Histológico, Ultraestructural y de Elementos
Provedor de dados: 77
Autores: Roa,Ignacio; Castro,Rodrigo; Rojas,Mariana.
Las branquias son los órganos destinados al proceso de respiración en los peces, estas están consideradas, entre las estructuras más delicadas del cuerpo de los teleósteos ya que están expuestas a sufrir daños de cualquier agente irritante, los cuales constituyen la causa más frecuente y significativa de sus cambios patológicos. Los objetivos del presente estudio son caracterizar las alteraciones branquiales desde los puntos de vista anatómico, histológico, además, determinar niveles de Ca, P y Zn del tejido óseo de la columna vertebral y cráneo de salmones afectados. Se utilizaron 47 salmones, divididos en dos grupos: control y con deformaciones, a los cuales se les realizaron análisis macroscópico, histológico, ultraestructural y de elementos. Se...
Tipo: Journal article
Palavras-chave: Salmónidos; Branquias; Deformación.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100007

Degradación fotoquímica del carbono orgánico disuelto: Producción de peróxido de hidrógeno y efectos potenciales sobre el plancton en el Canal Beagle (Tierra del Fuego)
Provedor de dados: 97
Autores: HERNANDO,MARCELO; FERREYRA,GUSTAVO; MALANGA,GABRIELA.
Se analizó la producción de peróxido de hidrógeno (H2O2) en función de la dosis de radiación solar en aguas del Canal Beagle, en la desembocadura del Río Lapataia, Ushuaia (Tierra del Fuego, Argentina). El estudio se realizó entre Octubre y Noviembre de 2004. Durante dicho período se produce anualmente una disminución en la concentración del ozono estratosférico, lo que ocasiona un aumento en las dosis de radiación ultravioleta B (RUVB, 280-320 nm) incidente en la superficie de la tierra, en relación al resto de las longitudes de onda del espectro solar (radiación ultravioleta A [RUVA, 320-400 nm] y radiación visible [RVis, 400-700 nm]). Se observaron diferencias significativas en la foto-oxidación del carbono orgánico disuelto (COD) cuando se comparó la...
Tipo: Journal article
Palavras-chave: COD; Fitoplancton; Ozono; Peróxido de hidrógeno; RUVB.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400010

Degradation of citronellol, citronellal and citronellyl acetate by Pseudomonas mendocina IBPse 105
Provedor de dados: 69
Autores: Tozoni,Daniela; Zacaria,Jucimar; Vanderlinde,Regina; Delamare,Ana Paula Longaray; Echeverrigaray,Sergio.
The purpose of this work was to stud the biodegradation of citronellol, citronellal and citronellyl acetate by a soil Pseudomonas mendocina strain (IBPse 105) isolated from a Cymbopogon windelandi field. This strain efficiently used citronellol, citronellal, citronellyl acetate and myrcene as sole source of carbon, but was not able to grow on other 15 monoterpenoids evaluated. Gas chromatography-mass spectrometry (GC-MS) analysis of metabolites accumulation during P. medocina IBPse 105 growth on citronellol showed that this strain uses the citronellol catabolic pathway described for other species of the genus. IBPse 105 degradation of citronellyl acetate initiates by its hydrolysis to citronellol. The mini-Tn5 insertion in mutant IBPse 105-303, impaired in...
Tipo: Journal article
Palavras-chave: Biodegradation; Citronellol catabolism; Monoterpenes degradation; P. mendocina.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000200002

Degradation of methomyl by the novel bacterial strain Stenotrophomonas maltophilia M1
Provedor de dados: 69
Autores: Mohamed,Mervat S.
The use of microorganisms in the degradation and detoxification of many toxic xenobiotics, especially pesticides, is an efficient tool for the decontamination of polluted sites in the environment. A novel bacterial strain (M1) was isolated from several water samples contaminated with methomyl which is capable of degrading methomyl pesticide (1000 ppm) in the presence of 0.05% glucose. These water samples were collected from different irrigation sites in Egypt where methomyl is heavily applied. The partial sequence of 16SrRNA gene of the isolate showed the highest similarity to Stenotrophomonas maltophilia. Restriction fragment patterns of isolated plasmid DNA showed that this strain harbours two different plasmids PMa (8Kb) and PMb (5Kb). PMb succeeded to...
Tipo: Journal article
Palavras-chave: Carbamate; Methomyl; Plasmid; SPE-LC-ESI-MS; Stenotrophomonas.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400006

Delayed metamorphosis in decapod crustaceans: evidence and consequences
Provedor de dados: 97
Autores: GEBAUER,PAULINA; PASCHKE,KURT; ANGER,KLAUS.
Most marine invertebrate species exhibit a complex life cycle including a planktonic larval phase and a benthic juvenile-adult phase. Metamorphosis and settlement are the links between these phases of development. In many species, metamorphosis is triggered by specific chemical and/or physical cues, mainly associated with the adult habitat. In the absence of such cues, competent larvae can delay their metamorphosis by a few days to several months. Most investigations on the delay of metamorphosis have been realised on sessile or sedentary species. In relation to mobile decapod crustaceans, the number of such studies is low, probably because the members of this group retain their mobility after metamorphosis, and hence, may depend less on enviromental cues...
Tipo: Journal article
Palavras-chave: Delayed metamorphosis; Crustacea; Larvae.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200004

Deletion of DNA sequences of using a polymerase chain reaction based approach
Provedor de dados: 69
Autores: Pérez-Pinera,Pablo; Menéndez-González,Manuel; Vega,José Antonio.
We developed a simple, rapid and reliable method to delete DNA fragments in plasmids using a polymerase chain reaction based amplification of the circular DNA sequence that excludes the fragment to be deleted. The primers are designed to contain a non-complementary 5' sequence consisting of a restriction enzyme target sequence. Following PCR amplification, the plasmid is digested with Dpn I to eliminate the template DNA, with the chosen restriction enzyme, and ligated. The only limitation is the selection of the restriction enzyme target sequence that must not be present in the original plasmid. The method is straightforward in its execution and success relies on a meticulous primer design that permits us obtain 100% of transformants containing the desired...
Tipo: Journal article
Palavras-chave: Deletion; Mutagenesis; Polymerase chain reaction; Plasmid.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500018

DEMANDA POR IMPORTACIONES DE UVA DE MESA CHILENA EN EL MERCADO DE ESTADOS UNIDOS
Provedor de dados: 113
Autores: Nahuelhual M.,Laura.
En este trabajo se investigó el mercado estadounidense de importaciones de uva de mesa chilena, con el objetivo de analizar la competitividad de Chile en este mercado. Los estimadores de demanda para Chile, México y el resto del mundo (RDM) se obtuvieron usando el modelo LA/AIDS (Linear Approximation Almost Ideal Demand System). Se usaron datos trimestrales de cantidades de uva importadas por Estados Unidos desde cada país, valor de las importaciones y precios CIF (Cost, Insurance and Freight) de importación para el período comprendido entre el primer trimestre de 1989 y el segundo trimestre de 2002. Los estimadores de elasticidad precio propio mostraron una demanda inelástica para los tres países, con valores de -0,79; -0,86; y -0,82 para Chile, México y...
Tipo: Journal article
Palavras-chave: Demanda por importaciones; Uva de mesa; Modelo AIDS; Elasticidades de demanda.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100009

Demonstration of Intramuscular Artery and Nerve Distribution in the Same Whole Mount Gracilis Muscle by Different Colors
Provedor de dados: 77
Autores: An,Xiaochun; Dong,Pengfei; Qu,Xiangyang; Li,Shanhui.
The goal of this study was to describe the intramuscular artery and nerve distribution in detail by different colors in the same whole mount gracilis muscle. Red latex injection into the external iliac artery was performed on 14 fresh human cadavers. Two weeks later, 28 gracilis muscles were harvested from the cadavers and during this course the number of the arterial pedicle of each specimen was counted. Then, the muscle specimens were fixed in 10 % formalin 4 weeks for fixation and Sihler's staining procedures was performed on each muscle specimens. After all of the procedures, the gracilis muscle appeared almost transparent, and the extra- and intramuscular artery and nerve branches, even the terminals, were clearly demonstrated in red and dark blue...
Tipo: Journal article
Palavras-chave: Intramuscular Distribution; Artery; Nerve; Gracilis Muscle.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300035

Denied density-dependent seedling recruitment in a fragmented forest does not decrease seedling diversity
Provedor de dados: 97
Autores: VALDIVIA,CARLOS E; SIMONETTI,JAVIER A.
Negative density-dependent relationships in plant communities are currently claimed as an important mechanism for the maintenance of plant diversity. However, anthropogenic perturbations such as forest fragmentation might modify such relationships. We evaluated density-dependent relationships between seed and seedling abundance of a tree assemblage in a fragmented forest for estimating seed-to-seedling transitions and their effects on seedling richness. In continuous forest, two out of four and one out of four species presented significant or a tendency to exhibit negative seedling recruitment which is in agreement with other temperate and tropical forests. In forest fragments (1-6 ha), however, this relationship was uncoupled. Seedling richness and...
Tipo: Journal article
Palavras-chave: Density-dependent recruitment; Diversity; Forest fragmentation; Seedlings; Seeds.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200012

Dens evaginatus in Hemophilic Patient: A Case Report
Provedor de dados: 77
Autores: Borie E,Eduardo; Oporto V,Gonzalo; Aracena R,Daniel.
Tooth development occurs through the interaction between oral tissues during embryogenesis. Alteration through odontogenesis may cause tooth morphological alterations, one of these could be Dens evaginatus. This anatomical variation could be originated from an abnormal proliferation and folding of a portion of the inner enamel epithelium and subjacent ectomesenchymal cells of the dental papilla into the stellate reticulum of the enamel organ during the bell stage of tooth formation. Dens evaginatus is defined as a tubercle, or supplemental solid elevation on some portion of the crown surface. Inadequate clinical management of these teeth may result in a pulpal exposure and possible loss of vitality of the tooth. The research wants to report a case of Dens...
Tipo: Journal article
Palavras-chave: Dental morphology; Dens evaginatus; Odontogenesis; Hemophilia.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200006

Densidad Asimétrica Neuronal Inter-Hemisférica de la Corteza Insular en Ratones FMR1 Knock-Out
Provedor de dados: 77
Autores: Ramírez,N; Maestu,C; Ramos,M; del Pozo,F.
El síndrome X frágil en los seres humanos es causado por una mutación en el gen FMR1 y se asocia con grave retraso mental, hiperactividad y ansiedad. Hemos comparado ratones FMR1-KO con ratones Control en la densidad neuronal de la corteza insular, área del cerebro asociada con el procesamiento del dolor y manejo de la ansiedad. Los ratones también fueron sometidos a una prueba de aprendizaje espacial en un entorno de ansiedad. Los resultados muestran asimetría significativa entre la densidad neuronal entre ínsula izquierda y derecha en KO en comparación con ratones de tipo Control. En cuanto al comportamiento, a pesar de los ratones KO no mostraron marcados déficits en la realización de tareas mostraron una velocidad superior a la de sus homólogos de tipo...
Tipo: Journal article
Palavras-chave: FMRP; FMR1; Corteza insular; Dolor; Ansiedad; Modelo animal.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400040

DENSIDAD NEURONAL EN LA CORTEZA VISUAL PRIMARIA (ÁREA 17), DE DOS ESPECIES DE ROEDORES SILVESTRES
Provedor de dados: 77
Autores: Olivares,R.; Godoy,G.; Adaro,L; Aboitiz,F.
Diversos estudios experimentales demuestran que modificaciones medioambientales (por ejemplo: nutricionales y lumínicas), pueden producir alteraciones en el desarrollo normal de la corteza visual y sus conexiones. Por otro lado, es posible que en condiciones naturales, las especies animales hayan desarrollado adaptaciones a las distintas condiciones de luminosidad en que realizan su actividad. Por ende, la finalidad de este trabajo, fue estudiar la corteza visual primaria (área 17), de dos especies de roedores silvestres, relacionados filogenéticamente, pero con diferentes períodos de actividad; Abrothrix olivaceus (n=7) y Phyllotis darwini (n=7), con el propósito de evidenciar cambios detectados a través de la medición de la densidad neuronal, mediante la...
Tipo: Journal article
Palavras-chave: Corteza cerebral; Corteza visual; Densidad neuronal; Phyllotis sp.; Abrothrix sp.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400007

Densidad Neuronal en la Corteza Visual Primaria (Área 17), en Dos Especies de Octodon
Provedor de dados: 77
Autores: Olivares,R; Ortíz,A; Henríquez,M; Adaro,L; Aboitiz,F.
Estudios experimentales demuestran que modificaciones medioambientales pueden producir alteraciones en el desarrollo normal de la corteza cerebral visual y sus conexiones. Por otra parte, es posible que en condiciones naturales, las especies animales hayan desarrollado adaptaciones genéticas a las distintas condiciones de luminosidad en que realizan su actividad. Recientemente, se han observado variaciones significativas en la densidad neuronal cortical del área 17 (área visual primaria), en roedores silvestres con diferentes períodos diarios de actividad y relación filogenética distante (Abrothrix olivaceus y Phyllotis darwini), pero aún no se ha determinado la naturaleza genética o plástica de dichas diferencias. En este trabajo se compararon especies...
Tipo: Journal article
Palavras-chave: Corteza cerebral; Corteza visual; Densidad neuronal.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100036

Densidad Neuronal en la Corteza Visual Primaria (Área 17), en Ratas Sometidas a Estrés Crónico
Provedor de dados: 77
Autores: Olivares,R; Toledo,C; Vera,Y; Morgan,C; Pérez,H; Ortíz,A; Henríquez,M; Hernández,A; Cifuentes,F.
El estrés puede ser definido como una amenaza a la integridad psicológica o fisiológica de un individuo. Por otro lado, se ha verificado que el estrés tiene efecto sobre la morfología y función de diversas estructuras del Sistema Nervioso Central, relacionadas con el aprendizaje, memoria y respuestas emocionales, tales como el hipocampo, amígdala y corteza prefrontal. Es por lo anterior, que el objetivo del presente trabajo fue realizar un estudio de la anatomía de la corteza visual primaria (área 17), en ratas machos (n=9), de la cepa Sprague-Dawley, de 3 meses de edad (250-350g.), sometidas a estrés crónico por inmovilización. Es así como se observó que el grupo estrés (n=3) presentó una menor densidad neuronal que el grupo control (n=3) y una...
Tipo: Journal article
Palavras-chave: Estrés; Corteza Visual; Densidad neuronal; Rata.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300030

Densidad y desplazamiento de Phyllotis limatus, un roedor del desierto de Atacama
Provedor de dados: 72
Autores: LOBOS,GABRIEL; ALZAMORA,ALEJANDRA.
Phyllotis limatus es un habitante del desierto de Atacama, donde se distribuye en las costas áridas y pendientes andinas del Pacífico, alcanzando hasta los 4.000 msnm. Con motivo de un estudio de manejo de fauna en la prepuna chilena, tuvimos la oportunidad de capturar y marcar micromamíferos. A partir de este seguimiento, estudiamos la densidad y desplazamiento de la especie en un ambiente desértico de altura. Pudimos registrar desplazamientos que alcanzaron hasta 2,5 km en un individuo relocalizado y 1,2 km en un individuo residente. Del mismo modo, podemos señalar que las densidades de Phyllotis en estos ambientes extremos son bajas, y ello se relaciona con las restricciones ambientales propias de estos ecosistemas.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100006

Densitometric Analysis of the Human Ulna
Provedor de dados: 77
Autores: Aguado-Henche,S; Clemente de Arriba,C; Carrascosa-Sánchez,J.
This study describes the distribution of the normal bone mass in the mature human ulna, as knowledge of distribution may provide information to orthopaedic surgeons for the treatment of such fractures while advancing the understanding of the responses of osteosynthesis elements during bone repair. A random sample of 41 dry ulnas was studied with a DXA system using a Norland XR-26 densitometer. Two projections were performed, lateral and antero-posterior. In both projections five regions of interest (ROI) were selected: proximal (ROI 1), proximal-intermediate (ROI 2), intermediate (ROI 3), distal-intermediate (ROI 4) and distal (ROI 5). All statistical calculations were performed using Stat graphics Plus (version 5.1) and SPSS (version 15.0). Bone mineral...
Tipo: Journal article
Palavras-chave: Densitometry; Ulna; Bone mineral density; Bone mineral content; Elbow.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300016

Density and abundance of Rhea pennata garleppi (Struthioniformes: Rheidae) in the Puna ecoregion of Argentina
Provedor de dados: 97
Autores: Marinero,Nancy Verónica; Cortez,Ricardo Omar; Navarro,Joaquín Luis; Martella,Mónica Beatriz.
BACKGROUND: Rhea pennata is classified internationally as a near-threatened species, with the subspecies R. p. garleppi being listed as endangered. FINDING: The aim of this study was to provide updated information on the density and abundance of R. p. garleppi in the southern Puna ecoregion of Argentina. Density was estimated indirectly on the basis of monthly feces counts during 2011 and 2012, using line-transect surveys. Monthly abundance was calculated by multiplying the density of each month by the area of the reserve (400 km²). Population size range was calculated considering the average of the months with the highest abundance (and density) as the upper limit and the average of the months with the lowest abundance (and density) as the lower limit....
Tipo: Journal article
Palavras-chave: Rhea pennata garleppi; Puna; Conservation; Andean precordillera.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100016

DENSITY AND MORPHOMETRY OF MYENTERIC NEURONS OF THE ILEUM OF RATS SUBJECTED TO CHRONIC ALCOHOLISM
Provedor de dados: 77
Autores: dos Santos Pereira,Marli Aparecida; Molinari,Sonia Lucy; de Sousa,Fernando Carlos; André,Oriana Elaine; de Miranda Neto,Marcílio Hubner.
This work verified the changes caused by ethanol ingestion on the myenteric neurons of the ileum of rats subjected to chronic alcoholism. Twenty rats (Rattus norvegicus) were divided in control (GC) and alcoholic (GA) groups during 210 days. The animals from group GA received sugar-cane brandy diluted to 30 GL and those from group GC received water. Both groups were fed with rodent chow ad libitum. The ileum was prepared as whole-mounts for neuronal staining according to Barbosa (1978) and Gabella (1979). The neurons were counted and the cell bodies were measured. The statistical analysis revealed a significant decrease in the number of large neurons in GA compared with GC, while there was a significant increase in the number of small neurons in GA. There...
Tipo: Journal article
Palavras-chave: Alcoholism; Ileum; Myenteric neurons.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000300010

Density and Morphometry of Overall Myenteric Neurons Population from the Duodenum of Diabetic Rats (Rattus norvegicus) under Ascorbic Acid Supplementation
Provedor de dados: 77
Autores: Pereira,Marli Aparecida dos Santos; Liberati,Ana Paula; Souza,Ivan Domicio da Silva; Zanoni,Jacqueline Nelisis.
The objective of this work was to evaluate the overall myenteric neurons population from the duodenum of adult streptozotocin-induced diabetic rats supplemented with ascorbic acid (AA), a potent antioxidant. Fifteen 90-day-old rats were divided in groups: control (C), diabetic (D), diabetic treated with ascorbic acid (DA). After 120 days of experimental period duodenums were resected and processed as whole-mount preparations according to Giemsa's technique, which allowed us to evaluate neuronal density in an area of 8.96 mm² and measure the area of 500 neuronal cell bodies per group. It was observed a 32.55% reduction in neuronal density of group D when compared to group C (p&lt;0.05). The density of spared neurons in group DA, in relation to group D, was...
Tipo: Journal article
Palavras-chave: Ascorbic acid; Diabetes mellitus; Duodenum; Oxidative stress.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200017

Dental anomalies in Dromiciops gliroides (Microbiotheria, Microbiotheriidae), Caenolestes fuliginosus and Rhyncholestes raphanurus (Paucituberculata, Caenolestidae)
Provedor de dados: 97
Autores: MARTIN,GABRIEL M.
Dental anomalies are described after analyzing series of skulls and mandibles of three species of South American marsupials: the monito del monte {Dromiciops gliroides), the silky shrew-opossum {Caenolestes fuliginosus) and the Chilean shrew-opossum {Rhyncholestes raphanurus). The anomalies are classified into three categories: (1) supernumerary or missing teeth in normal positions of the dental series, (2) morphological anomalies like teeth fusion or anomalous crown shape, and (3) presence of teeth in unusual positions. Cusp fusion and supernumerary teeth at the end of the toothrow have been observed predominantly in D. gliroides. A tendency to find supernumerary or missing teeth is observed between the procumbent incisors and the second lower premolars...
Tipo: Journal article
Palavras-chave: Dental anomalies; Dromiciops; Caenolestes; Rhyncholestes.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400001

Dental Arch Size, Biting Force, Bizygomatic Width and Face Height in Three Colombian Ethnic Groups
Provedor de dados: 77
Autores: Bedoya,A; Osorio,J. C; Tamayo,J. A.
The objective of this study was to describe transversal dimensions of the dental arches, bite force and facial index in three ethnic groups representative of Colombia. The sample size included 197 adolescents, 12 to 14 year old, 33% mestizo, 35% of African ancestry and 32% Amazon Indian; 50.3% male and 49.7% female. The comparative analysis to determine differences between ethnic groups was made by the Kruskal Wallis test and then the Principal Component Analysis was used to establish the pattern of measurements identifying ethnic characteristics. All measurements showed statistically significant differences among ethnic groups except facial height (p=0.157). It was evidenced that Amazon indian have a higher bite force (p &lt;0.05) than the other twoethnic...
Tipo: Journal article
Palavras-chave: Facial biotype; Bite force; Dental arch; American ethnia.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100009

Dental Gemination in the Inferior Canine in Both Dentition: Case Report
Provedor de dados: 77
Autores: Alves,Nilton; Nascimento,Carlos Manuel de Oliveira; Patriarca,Juvenal João.
Geminate teeth are anomalies arising from the attempt of the division of a only one germ, characterized by invagination and resulting in incomplete formation of two teeth. In general, it presents two crowns, totally or partially separated, with one root and one root canal. Female patient, 8 years old, Asian descent (Chinese), attended a private clinic (Odemira Dental Clinic) in Odemira, Portugal, for a routine consult. At intraoral clinical examination differentiated coronary anatomy, of the tooth 83 was found , with the presence of a bifid crown in which there was a central groove that came from the cemento-enamel junction. The radiographic exam revealed the presence of only one wide root canal, and two separate pulp cavities, each one corresponding to a...
Tipo: Journal article
Palavras-chave: Dental gemination; Inferior canine; Radiographic anatomy; Bifid crown.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300033

Dental Morphological Markers as a Proxy for Ethnicity in Robinson Crusoe Islanders
Provedor de dados: 77
Autores: Villanueva,Pía; Quevedo,Mónica; de Barbieri,Zulema; Piñeiro,Soledad; Herrero,Carolina; Fernández,María Angélica; Palomino,Hernán.
Chilean Robinson Crusoe Island is a semi-isolated location with unusually high rates of both consanguinity and language disorder. The current population of 633 inhabitants is descended almost exclusively from the colonization at the end of the 19th century, as there were few preceding immigrations to the island. This study investigates the genetic composition and degree of miscegenation within the island population, using dental morphological markers. The universe of island children was studied (n= 128, 3 to 15 years of age) using clinical exams, dental cast, and identification of each individual within a previously-constructed extensive genealogy for the island. The frequencies for Carabelli's cusp (61.7%), shovel-shaped incisor (9.4%), and sixth cusp...
Tipo: Journal article
Palavras-chave: Dental morphological markers; Carabelli's cusp; Shovel-shaped incisor; Robinson Crusoe Island.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200021

Dental Non-Metric Traits in a Pre-Conquest Sample "Calchaquí" From Argentina, South America
Provedor de dados: 77
Autores: Bollini,Gabriel A; Rodríguez-Flórez,Carlos David; Colantonio,Sonia E.
The present study was carried out with a Calchaquí human Pre-Conquest sample from Northwest of Argentina, with the aim of exploring the dental morphology patterns in this population. This study was carried out by means of a macroscopic analysis in permanent dentitions of 7 skulls. 40 dental non-mtetric traits were recorded using the ASU Dental Anthropology System. Percentages &gt;70% was found only in 4 traits. Calchaquí sample studied here is near to these values in shovel shape expression, but the results of this study suggest that a Sinodont pattern is no clear for this sample. To conclude, the present investigation provides additional, insightful elements for a description of biological factors in the process of dental morphologic diversification...
Tipo: Journal article
Palavras-chave: Bilateral asymmetry; Dental non-metric traits; Pre-conquest samples; Argentina.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400018

Dental Pulp Fibroblast and Sex Determination in Controlled Burial Conditions
Provedor de dados: 77
Autores: Sandoval,Catherine; Nuñez,Marcelo; Roa,Ignacio.
The need to identify bodies that are found as a result of disappearances with a diversity of causes, illegal burials and massive disasters, represent a wide percentage of dentistry practice on forensic research. The following study determined the performance of Barr Body Test, in fibroblasts of healthy teeth, under different conditions of burial (in vitro) with variations in pH, humidity and salinity in terms of general accuracy and sensitivity for men and women. Analyzed sample considered 47 dental pulps, taken from teeth under burial conditions during a period of a month. From dental pulps samples, 265 histological cuts valid for this study, were obtained, which were observed with an optical microscope under conventional H/E staining. Results showed a...
Tipo: Journal article
Palavras-chave: Barr body; Fibroblast; Dental pulp; Sex identification; Burial conditions.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200026

Department of International Relations of CONICYT
Provedor de dados: 48
Autores: ALTAMIRANO,XAVIER; VELIT,CECILIA.
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000500001

Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)
Provedor de dados: 48
Autores: CANALS M,MAURICIO; ATALA,CRISTIAN; OLIVARES,RICARDO; NOVOA,FRANCISCO F; ROSENMANN,MARIO.
We studied the departure from the physical optimality of the bronchial tree of rats using both i) the minimum volume and power and ii) the minimum surface and drag criteria, considering the bronchial junction as the unit study based on Zamir's model for vascular trees. Our results show deviations of the junctions of the bronchial tree from the expected optimums in the proximal airway that can be explained by both, the turbulent or transitional flow regime, and the airway's necessity to distribute its terminal branches in the alveolar surface filling the thoracic volume. The departures of the observed values at the optimum for the minimum volume and power were significantly different than the obtained departure values for the minimum surface and drag...
Tipo: Journal article
Palavras-chave: Lung; Junction optimality; Optimization; Broncography.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000300015

Depositación atmosférica de nitrógeno en un transecto valle longitudinal-cordillera de Los Andes, centro-sur de Chile
Provedor de dados: 97
Autores: OYARZÚN,CARLOS E.; GODOY,ROBERTO; LEIVA,SERGIO.
El aumento de las actividades agrícolas y ganaderas en el centro-sur de Chile puede producir elevadas emisiones de nitrógeno hacia la atmósfera (mayormente NH3). El amoniaco es transportado por corrientes de aire y depositado en el suelo y vegetación. El presente estudio evalúa la depositación atmosférica de compuestos nitrogenados (NO3- y NH4+) en la química de las precipitaciones en un transecto altitudinal de 66 km, desde los alrededores de la ciudad de Osorno (40º 35' S, 72º 57' O, 55 m de altitud) hasta la cordillera de Los Andes, Parque Nacional Puyehue (40º 46' S, 72º 11' O, 1.120 m de altitud). En siete sitios, durante el período anual junio-1999 hasta mayo-2000, se registró la precipitación y mensualmente se colectaron muestras de agua para...
Tipo: Journal article
Palavras-chave: Depositación; NO3-; NH4+; Química del agua; Agricultura-ganadería; Bosque templado lluvioso; Nothofagus.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100021

Depth-selection patterns and diel vertical migration of Daphnia ambigua (Crustacea: Cladocera) in lake El Plateado
Provedor de dados: 97
Autores: RAMOS-JILIBERTO,RODRIGO; ZÚÑIGA,LUIS R.
Eutrophic temperate and sub-tropical lakes often exhibit a marked vertical structure during the warm season that involves important spatial differences of physical, chemical and biological variables. Therefore, zooplankton is exposed to a highly heterogeneous environment in the vertical dimension. In this work, We analyze the depth-distribution of the cladoceran Daphnia ambigua in the eutrophic, monomictic lake El Plateado at midday and midnight, along with its relationship with the vertical distribution of water temperature and dissolved oxygen concentration. We also attempt to define whether or not this population exhibits a diel vertical migration. The results show significant changes in the day/night vertical distribution of D. ambigua during its...
Tipo: Journal article
Palavras-chave: Chile; Daphnia; Depth-selection; Diel vertical migration; Zooplankton.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300007

Depurando la Terminologia Anatomica: Apertura y Foramen, Dos Similitudes y Redundancia Terminológica
Provedor de dados: 77
Autores: Duque Parra,Jorge Eduardo; Barco Rios,John; Duque Quintero,Natalia.
El uso redundante de términos en el campo de la morfología, además de dificultar el aprendizaje de los estudiantes, va en contra de los preceptos establecidos por el Programa Federativo Internacional para la Terminología Anatómica (FIPAT) sobre el uso de una terminología anatómica unificada, mediante la cual se pretende evitar la redundancia terminológica. Se propone suprimir el término apertura piriforme y reemplazarlo por el término foramen piriforme, con el fin de evitar la ambigüedad y la utilización de distintos nombres que describen a una estructura de similares características.
Tipo: Journal article
Palavras-chave: Apertura; Foramen; Terminología.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400037

DERIVATION AND APLICATION OF ALGORISM OF 5 METERS (IMAGE MASK) FOR MANGROVE CLASSIFICATION
Provedor de dados: 72
Autores: Camargo,Lucia; Pellerin,Joel; Panitz,Clarice M.N.
Mangroves' forest are one of the most important coastal ecosystems. Distributed in tropical and sub-tropical regions, mangroves achieve their maximum development in southwest of Asia. Mangroves' forest are under severe stress mainly in sub-tropical countries due to natural tensors and the demographic ones. Along the Brazilian coast, mangroves are subjected to the effects of human growth and economic pressure with their diverse activities affecting mangrove structural development and biodiversity. It is necessary and urgent that mangrove are integrated in the Coastal Planning as a way of preservation and conservation of its natural resources through a sustainable management. Remote sensing techniques and GIS were applied in the actualization of Ratones'...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200015

Desafíos para la Transposición Didáctica y Conocimiento Didáctico del Contenido en Docentes de Anatomía: Obstáculos y Proyecciones
Provedor de dados: 77
Autores: Pellón Arcaya,Mario; Mansilla Sepúlveda,Juan; San Martín Cantero,Daniel.
La enseñanza de la Anatomía a nivel de pre-grado exige una formación basada en competencias que genere resultados de aprendizajes, donde converjan saberes sabios de la disciplina con saberes didácticos de la pedagogía. Para ello, se planteó un diseño cualitativo de investigación con el propósito de describir desafíos, obstáculos y proyecciones de la transposición didáctica y el conocimiento didáctico del contenido disciplinario de la Anatomía en la Escuela de Medicina de la Universidad Mayor de Temuco, en base a la Teoría Fundamentada, Método Comparativo Constante y Triangulación Metodológica. La muestra se constituyó con la totalidad de los docentes de la cátedra de Anatomía. A partir de la codificación abierta emergieron cinco categorías: a) dificultades...
Tipo: Journal article
Palavras-chave: Transposición didáctica; Enseñanza de la Anatomía; Conocimiento disciplinario; Investigación cualitativa.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300018

Desarrollo de cronologías de ancho de anillos para alerce (Fitzroya cupressoides) en Contao y Mirador, Chile
Provedor de dados: 97
Autores: NEIRA,EDUARDO; LARA,ANTONIO.
Se desarrollaron dos cronologías de ancho de anillos de crecimiento a partir de muestras de alerce (Fitzroya cupressoides (Molina) Johnston), colectadas en dos sitios: Contao, Cordillera de los Andes (41º 33'S, 72º 38'W), y Mirador, en la Cordillera de la Costa (40º 10'S, 73º 42'W). En la elaboración de las cronologías se utilizó el programa COFECHA para verificar el cofechado y se desarrolló para cada sitio una cronología utilizando el programa computacional ARSTAN. Se compararon las cronologías Contao y Mirador, con otras existentes para alerce encontrándose una alta similitud de la cronología Contao con la desarrollada para Lenca (41º 33'S, 72º 36' W). Contao presentó los valores más altos en los estadígrafos analizados con relación a las demás...
Tipo: Journal article
Palavras-chave: Dendrocronología; Alerce; Fitzroya cupressoides; Perturbaciones; Incendios.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400012

DESARROLLO DE HUEVOS Y LARVAS TEMPRANAS DE LA MERLUZA DEL SUR, MERLUCCIUS AUSTRALIS, CULTIVADOS BAJO CONDICIONES DE LABORATORIO
Provedor de dados: 72
Autores: Bustos,Claudia A; Landaeta,Mauricio F.
Se describe por primera vez el desarrollo embrionario y larval temprano de la merluza del sur, Merluccius australis, utilizando ejemplares cultivados en el laboratorio. Los huevos miden 0,9-1,1 mm de diámetro, tienen corion liso, vitelo no segmentado y presentan 1 gota oleosa de 0,19-0,27 mm de diámetro. Las larvas mantenidas a 11,5 ºC eclosionan 7 días después de la fertilización con un tamaño promedio 2,8 mm LN (longitud notocordal); el vitelo se absorbe completamente en 9 días. Las larvas con saco vitelino crecen a una tasa lineal de 0,15 mm/día. El crecimiento se reduce significativamente (test de pendientes múltiples, p &lt; 0,001) a 0,08 mm/día, desde la primera alimentación hasta los 45 días de vida
Tipo: Journal article
Palavras-chave: Merluccius australis; Huevos; Larvas con saco vitelino; Crecimiento; Cultivo.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200016

Desarrollo de la Aleta Caudal del Salmón (Salmo salar)
Provedor de dados: 77
Autores: Rojas,Mariana; Pellón,Mario; del Sol,Mariano.
Las patologías y traumas de la aleta caudal afectan la natación, dificultan la alimentación y la eficiencia de escape de los peces, además aumentan la susceptibilidad a las infecciones bacterianas y fúngicas. Los salmones adultos pueden regenerar rápida y completamente su aleta si esta es amputada. Sin embargo, se han reportado en el sur de Chile, alevines que expresan defectos anatómicos en la aleta caudal asociados a un alto índice de mortalidad donde no ocurre regeneración. Existen múltiples estudios sobre la aleta caudal de peces adultos pero esta descripción no concuerda con la morfología de la fase de alevín. Nuestro objetivo es describir la anatomía e histología de la aleta caudal del salmón de 15 mm, 30 mm y 60 mm para facilitar el diagnóstico de...
Tipo: Journal article
Palavras-chave: Aleta caudal; Lepidotriquias; Alevín; Salmón; Desarrollo; Salmo salar.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200017

Desarrollo de la fijación simbiótica de nitrógeno en una cronosecuencia primaria en la Isla Santa Inés, Región de Magallanes, Chile
Provedor de dados: 97
Autores: TRONCOSO,PAULINA A; PÉREZ,CECILIA A; LARRAIN,JUAN; ARDILES,VICTOR.
La fijación biológica del nitrógeno (FBN) es un proceso clave en la recuperación de este elemento esencial para los seres vivos luego que perturbaciones catastróficas, como el avance y retroceso de glaciales, han agotado el capital de nitrógeno (N) del suelo. El objetivo principal de este trabajo fue analizar los niveles de fijación simbiótica de nitrógeno (FSN) asociada a la flora del piso del bosque en una cronosecuencia primaria, desarrollada a partir del retroceso glacial en la Isla Santa Inés (53° 45' S), región de Magallanes, ocurrido durante los últimos 400 años. La flora del suelo que forma tapices en el piso del bosque está compuesta principalmente por la angiosperma Gunnera magellanica Lam. y por una gran diversidad de especies de briófitas. La...
Tipo: Journal article
Palavras-chave: Briófitas; Cianobacterias; Gunnera magellanica; Sucesión primaria.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300011

DESARROLLO DE LA ICTIOLOGIA: EXTENSION HACIA LA ENSEÑANZA BÁSICA y MEDIA EN CHILE
Provedor de dados: 72
Autores: Huaquín,Laura G.
Con el objeto de hacer extensivos los conocimientos ictiológicos e incrementar las posibilidades de desarrollo de esta disciplina en nuestro país, se propone la creación de un Programa Educativo a Distancia para la enseñanza de la Ictiología, considerando el desarrollo de temas básicos y especializados, al alcance de enseñanza básica y media, con la finalidad de motivar en estos estudiantes las inquietudes hacia el conocimiento de la fauna íctica tanto la representada en los ambientes marinos como dulceacuícolas del país. El diagnóstico sobre el conocimiento de este tipo de fauna en el ciudadano común es bastante precario. Chile es un país con grandes recursos hidrológicos, una extensa costa, numerosas cuencas, más de 1.000 especies de peces marinos...
Tipo: Journal article
Palavras-chave: Programa Educativo; Ictiología; Enseñanza básica y media; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100024

Desarrollo de la Investigación sobre Variación Morfológica de Poblaciones Históricas Sudamericanas Utilizando Rasgos Dentales No Métricos
Provedor de dados: 77
Autores: Fonseca,Gabriel M; Aramburú,Guillermo; Rodríguez,Ivana; Bollini,Gabriel A; Atencio,Juan P; Berta,María J; López-Lázaro,Sandra; Cantín,Mario; Lissera,Rosa G.
El análisis de rasgos no métricos dentales ha logrado establecer relaciones biológicas de grupos humanos pasados y actuales con un alto valor taxonómico. Aunque Sudamérica ha sido objeto de un número considerable de investigaciones sobre poblamiento, migraciones y mestizaje, son relativamente pocos los estudios que han utilizado información de rasgos dentales para este fin, con las consiguiente ausencia de datos en amplias zonas geográficas. Se realizó una revisión sistemática de la literatura en MEDLINE, SciELO, REDALYC y LILACS, sin restricción de fecha de publicación. Se incluyeron artículos completos y disponibles primarios y secundarios en español, inglés y portugués donde se realice el análisis de rasgos morfológicos dentales en poblaciones...
Tipo: Journal article
Palavras-chave: Antropología dental; Rasgos no métricos; Sudamérica; Odontología forense.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100018

Desarrollo de la Médula Espinal de Salmón (Salmo salar) durante el Período Post-eclosional
Provedor de dados: 77
Autores: Hernández,Hilda; Rojas,Mariana.
En este estudio se describe el desarrollo post-eclosional de la médula espinal del salmón. Salmo salar. Se utilizaron 200 alevines recién eclosionados, los que fueron cultivados en el Centro de Estudios Acuícolas de la Universidad de Chile. Las condiciones ambientales de cultivo fueron de un 90% de saturación de oxigeno. La temperatura ambiental se mantuvo en 7°C. A los días 1, 3, 5 7 ds post-eclosión, 50 alevines por grupo etario fueron anestesiados y sacrificados por exposición a 5% Benzocaina diluida en agua (Kalmagin 20®, Farquímica). Posteriormente fueron fijados en formalina tamponada al 10% y procesados mediante técnica histológica. Para cada alevín se tomaron a nivel de la aleta dorsal un total de 40 cortes coronales seriados de 5µm de grosor, los...
Tipo: Journal article
Palavras-chave: Médula espinal; Sistema nervioso; Neurogénesis; Alevín; Salmón.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100029

Desarrollo de la Piel y sus Anexos en Vertebrados
Provedor de dados: 77
Autores: Meruane,Manuel; Rojas,Mariana.
La Piel y sus estructuras asociadas permiten a los seres vivos subsistir en los diferentes ambientes ecológicos. El desarrollo de la piel y sus anexos en diferentes especies repite patrones comunes. De suma importancia es la interacción epitelio-mesénquima como regulador inicial de este desarrollo. El evento crucial en la formación de anexos, es la aparición de una placoda ectodérmica, a la cual se le asocia una condensación de células dérmicas, expresándose proteínas como Sonic Hedgehog (SHH) y la proteína morfogenética del hueso (BMP) para luego dar forma al anexo de cada especie. En esta revisión describiremos las etapas sucesivas que transcurren en la formación de la dermis, epidermis y anexos, con énfasis en las proteínas que dirigen el proceso.
Tipo: Journal article
Palavras-chave: Piel; Dermis; Epidermis; Anexos.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400025

Desarrollo de la sagitta en juveniles y adultos de Odontesthes argentinensis (Valenciennes, 1835) y O. bonariensis (Valenciennes, 1835) de la provincia de Buenos Aires, Argentina (Teleostei: Atheriniformes)
Provedor de dados: 97
Autores: TOMBARI,ANDREA D; VOLPEDO,ALEJANDRA V; ECHEVERRÍA,DINORAH D.
Se describió el desarrollo del otolito Sagitta de juveniles y adultos de Odontesthes argentinensis procedentes de Punta Rasa (36°22' S) y Miramar (38°16' S) y de Odontesthes bonariensis de la Laguna de Chascomús (35° 36' S). Se estudió, la morfología de las sagittae de ambas especies, analizando cuatro grupos morfológicos para O. argentinensis (I: 75-120 mm, II: 130-220 mm, III: 230-270 y IV: 280-320 mm) y tres grupos morfológicos para O. bonariensis (I: 80-120 mm, II: 130-220 y III: 230-320 mm). Las características morfológicas comunes a la sagitta, de ambas especies, en los grupos estudiados son: presencia de sulcus, depresión areal dorsal en la cara medial, cara lateral con estrías y la presencia de un punto culminante en el borde dorsal. En la sagitta...
Tipo: Journal article
Palavras-chave: Morfología; Sagitta; Odontesthes; Atherinopsidae.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400003

Desarrollo de los Miembros en los Vertebrados
Provedor de dados: 77
Autores: Antonelli,Marcelo; Rosas,Carlos; Rojas,Mariana.
Los miembros de los vertebrados son estructuras complejas con tres ejes a considerar, proximal-distal, anterior-posterior y dorsal-ventral. La batería de genes involucrados en la formación de estas estructuras está bastante conservada en la evolución. El esbozo del miembro está compuesto de células mesenquimáticas indiferenciadas que derivan del mesodermo lateral somático cubiertas por ectodermo. La cresta apical ectodérmica es un centro productor de señales para el desarrollo y se ubica en el margen distal del esbozo de miembro. La zona de progreso esta a continuación y permite el crecimiento del miembro. El tipo de estructuras formadas a lo largo del eje proximal distal es especificado por los genes Hox. La proteína Sonic Hedgehog está involucrada en la...
Tipo: Journal article
Palavras-chave: Miembros; Cresta apical; Zona de progreso; Zona de actividad polarizante; Raya.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400040

DESARROLLO DE MODELOS PREDICTIVOS DE FENOLOGÍA Y EVOLUCIÓN DE MADUREZ EN VID PARA VINO CV. CABERNET SAUVIGNON Y CHARDONNAY
Provedor de dados: 113
Autores: Ortega-Farías,Samuel O.; Lozano,Pedro; Moreno,Yerko; León,Lorenzo.
Se realizó un estudio para desarrollar modelos predictivos de fenología y evolución de madurez en vid para vino (Vitis vinifera), en un viñedo ubicado en el fundo "La Oriental" (35º27’ lat. Sur y 71º37’ long. Oeste) provincia de Talca, Chile, durante la temporada 1998/99. Para esto se efectuaron mediciones del número de hojas, largo de brotes, diámetro de bayas, sólidos solubles, acidez total y pH en los cultivares Cabernet Sauvignon y Chardonnay. Para desarrollar los modelos predictivos de fenología, sólidos solubles, y pH, en función de los grados día acumulados (temperatura base = 10 ° C), se utilizó la ecuación monomolecular de Mitscherlich, la cual asume que el crecimiento es continuo. En el caso de los modelos para la acidez total se utilizó una...
Tipo: Journal article
Palavras-chave: Sólidos solubles; Acidez total; Gradosdías; PH.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100003

Desarrollo de tomate en sustratos de vermicompost/arena bajo condiciones de invernadero
Provedor de dados: 113
Autores: Moreno Reséndez,Alejandro; Valdés Perezgasga,María Teresa.
Se evaluó el desarrollo del tomate (Lycopersicon esculentum Mill.) var. Flora-Dade, bajo condiciones de invernadero, utilizando diferentes mezclas de vermicompost/arena, en la Comarca Lagunera (101º40’ long. Oeste; 25º05’ lat. Norte), al norte de México. Se estudiaron cuatro tipos de vermicompost, generados por la acción de descomposición de las lombrices de tierra (Eisenia foetida Sav.), sobre los siguientes materiales: a) estiércol de caballo; b) estiércol de caballo + estiércol de cabra con paja de alfalfa (Medicago sativa L.) (1:1, v:v); c) estiércol de cabra con paja de alfalfa; y d) estiércol de cabra con paja de alfalfa + residuos de jardín (principalmente pasto y hojas ) (1:1, v:v). La composición de las mezclas de vermicompost/arena evaluadas,...
Tipo: Journal article
Palavras-chave: Vermicompost; Lombriz de tierra; Tomate; Descomposición.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100003

Desarrollo de un Sistema de Información Geográfica para Mejorar la Gestión del Agua de Riego del Embalse Convento Viejo, Chile
Provedor de dados: 113
Autores: Mena,Carlos; Ormazábal,Yony; Llanos,José Luis; Díaz,José.
Dentro del proceso de establecimiento de las líneas de desarrollo estratégico para la actividad agrícola, la geomática y sus diversas tecnologías permiten generar una caracterización altamente representativa y confiable del territorio, expresada en una base de datos digital dinámica y flexible, que propicia la planificación y el seguimiento de los cambios productivos observados en los terrenos beneficiados con el incremento del agua de riego y el mejoramiento de su red de distribución. El objetivo principal de la investigación fue crear un Sistema de Información Geográfica (SIG), alimentado con información base agropecuaria y socioeconómica, que permita la identificación de sectores homogéneos de intervención y el establecimiento de la tipología de las...
Tipo: Journal article
Palavras-chave: Embalse; Geomática; Gestión del agua de riego; Base de datos digital; Sistema de información geográfica.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000100006

Desarrollo del Aparato Digestivo
Provedor de dados: 77
Autores: Roa,Ignacio; Meruane,Manuel.
El aparato digestivo deriva del endodermo y el mesodermo, que forman su epitelio y la musculatura lisa respectivamente. Al igual que en el resto de los sistemas, existe un interacción epitelio-mesenquimática mediada por moléculas como Hedgehog, BMP y FoxF1 que determinan el crecimiento intestinal en sus ejes principales. Los genes Hox, junto con el resto de las moléculas, participan en la regionalización del sistema digestivo. En sus inicios lo denominaremos intestino primitivo, formado por un tubo endodérmico que deriva del saco vitelino; dividiéndose en intestino anterior, medio y posterior. En esta revisión veremos cómo estos 3 segmentos darán origen a las diferentes estructuras del sistema digestivo en los vertebrados.
Tipo: Journal article
Palavras-chave: Sistema digestivo; Intestino primitivo; Endodermo; Mesodermo.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400006

Desarrollo del gametofito y esporofito joven de Pteris chilensis Desv. (Pteridaceae-Pteridophyta)
Provedor de dados: 73
Autores: Letelier,Luis; Peñailillo,Patricio.
El cultivo ex situ de Pteris chilensis Desv. a partir de esporas es presentado. La germinación de las esporas ocurre a los 10-12 días y el patrón de germinación es del tipo Vittaria. Un gametófito filamentoso de 3-4 células es obtenido a los 23-24 días, logrando su desarrollo adulto entre los 60 a 95 días. Este se caracteriza por ser cordiforme y con alas simétricas. Los arquegonios se forman antes que los anteridios. Finalmente, la primera fronde aparece a los 115 días de sembradas las esporas. Las esporas se cultivaron en agar con medio nutritivo de Thompson, en cámara de cultivo con un fotoperíodo de 12 horas luz (1.500 lux) y una temperatura promedio de 25°C
Tipo: Journal article
Palavras-chave: Helechos; Morfogénesis; Chile; Región del Maule.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100009

DESARROLLO EMBRIONARIO DE LA PINTARROJA COMUN Schroederichthys chilensis (Guichenot, 1848) (CHONDRICHTHYES: SCYLIORHINIDAE)
Provedor de dados: 72
Autores: Hernández,Sebastián; Lamilla,Julio; Dupré,Enrique; Stotz,Wolfgang.
El presente estudio describe el desarrollo embrionario de la pintarroja común Schroederichthys chilensis, a través de observaciones de la morfología externa de la cápsula, morfología del embrión y mediciones del tiempo de gestación. Se recolectaron 60 cápsulas de huevos en la localidad de Chungungo (IV Región). Además se obtuvieron dos cápsulas desovadas por una hembra mantenida en cautiverio. Las cápsulas fueron descritas basándose en mediciones morfométricas, coloración, textura y presencia de las fisuras respiratorias. Para la determinación y descripción de la morfología embrionaria se utilizaron embriones extraídos de las cápsulas recolectadas. Para la determinación del tiempo de gestación se observaron continuamente 15 cápsulas con embriones vivos, a...
Tipo: Journal article
Palavras-chave: Desarrollo; Embriones; Cápsulas de huevos; Pintarroja; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100025

Desarrollo Embrionario del Capaz Pimelodus grosskopfii (Steindachner, 1879)
Provedor de dados: 77
Autores: Valbuena-Villarreal,Rubén D; Zapata-Berruecos,Beatriz E; David-Ruales,Carlos; Cruz-Casallas,Pablo E.
El conocimiento del desarrollo embrionario en los peces es especialmente importante en especies nativas con potencial para la piscicultura, en virtud que permite identificar eventos morfológicos y cronológicos, necesarios para establecer prácticas de manejo durante las fases de incubación y larvicultura. El capaz (Pimelodus grosskopfii) es una especie con potencial para cultivo comercial, por sus hábitos alimenticios omnívoros y aceptación de su carne en el mercado. Para estudiar el desarrollo embrionario de la especie, ejemplares adultos sexualmente maduros fueron inducidos a la reproducción con extracto de hipófisis de carpa (5,75 y 4,0 mg Kg-1, hembras y machos, respectivamente). Los óvulos seminados fueron incubados en un sistema de flujo ascendente de...
Tipo: Journal article
Palavras-chave: Blastómero; Blastulación; Desarrollo embrionario; Gastrulación; Organogénesis; Pimelodus grosskopfii.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100027

Desarrollo Embrionario del Pargo Colorado Lutjanus colorado (Jordan &amp;amp; Gilbert, 1882)
Provedor de dados: 77
Autores: Abdo-de la Parra,María Isabel; García-Aguilar,Noemí; Rodríguez-Ibarra,L. Estela; Velasco-Blanco,Gabriela; Ibarra-Castro,Leonardo.
El pargo colorado (Lutjanus colorado) es una especie con un alto valor comercial en el mercado mexicano, con potencial para su cultivo. Hasta la fecha no existen estudios sobre su reproducción, cultivo larvario y engorda en cautiverio. El presente trabajo es el primer reporte sobre la descripción a detalle del desarrollo embrionario de la especie bajo condiciones de cultivo. Los huevos fertilizados viables del pargo colorado son pelágicos, esféricos, transparentes y con una sola gota de aceite. Midieron 0,77±0,09 mm de diámetro y la gota de aceite 0,14±0,01 mm. La primera división ocurrió a las 0,05 horas post fertilización (HPF). La eclosión se llevó a cabo a las 17,22 HPF bajo las condiciones del presente estudio. Las larvas recién eclosionadas midieron...
Tipo: Journal article
Palavras-chave: Blástula; Gástrula; Organogénesis; Eclosión; Lutjanus colorado.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300025

Desarrollo larval de Mursia gaudichaudi (Milne Edwards 1837) (Decapoda, Brachyura, Calappidae)
Provedor de dados: 72
Autores: Gallardo,María de los A; Mujica,Armando.
Se describe el desarrollo larval de Mursia gaudichaudi basado en las zoeas I y II cultivadas en laboratorio y las zoeas I a la IV obtenidas de muestras planctónicas. Las larvas cultivadas en laboratorio, se obtuvieron de hembras ovígeras capturadas en la costa de Coquimbo, norte de Chile. Las características morfológicas y morfométricas de éstas permitieron identifcar las larvas capturadas con redes de plancton en la zona de Caldera y Coquimbo, durante la primavera de 2005. Las espínulas en la región proximal de la espina rostral, las de las espinas laterales del cefalotórax, los procesos espinosos de la antena y la longitud e inserción de las espinas laterales del abdomen, son las principales características morfológicas y morfométricas que permiten...
Tipo: Journal article
Palavras-chave: Brachyura; Calappidae; Coquimbo; Zoea.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100007

Desarrollo morfológico e histológico del sistema reproductor de Pomacea patula catemacensis (Baker 1922) (Mollusca, Caenogastropoda: Ampullariidae)
Provedor de dados: 97
Autores: CARREÓN-PALAU,AURA; URIA-GALICIA,ESTHER; ESPINOSA-CHÁVEZ,FÉLIX; MARTÍNEZ-JERÓNIMO,FERNANDO.
El "tegogolo" Pomacea patula catemacensis es un gasterópodo dulceacuícola comestible, endémico del Lago de Catemaco en Veracruz, México. En los últimos años las poblaciones naturales se han visto diezmadas debido a que su captura se realiza sin control, a lo que se suma el alto grado de deterioro ambiental que presenta el lago, producto del "azolvamiento", así como por la contaminación por plaguicidas y detergentes. El objetivo del presente estudio fue caracterizar histológica y morfológicamente el sistema reproductor de P. patula catemacensis y determinar las etapas de madurez gonádica en condiciones de laboratorio. Se determinó que la maduración depende de la talla y no de la edad de los organismos, y se identificaron cuatro etapas principales en el...
Tipo: Journal article
Palavras-chave: "tegogolo"; Histología; Anatomía; Reproducción; Lago de Catemaco.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000400010

Desarrollo morfológico y conductual de pollos del aguilucho chico Buteo albigula (Aves: Accipitridae) en el noroeste de la Patagonia argentina
Provedor de dados: 97
Autores: OJEDA,VALERIA; GELAIN,MARIANO; SYMPSON,LORENZO; TREJO,ANA.
El desarrollo morfológico y conductual del aguilucho chico (Buteo albigula) en el nido fue estudiado en cercanías de San Carlos de Bariloche, al noroeste de la Patagonia argentina. El estudio se basó en el seguimiento de dos pollos producidos en diferentes nidos en la temporada reproductiva 2001-2002, y se lo complementó con datos tomados ad libitum en otros nidos, esa misma y anteriores temporadas. Los pollos permanecieron en el nido por aproximadamente seis semanas. Durante su desarrollo morfológico se evidenciaron diversos cambios; notablemente, la aparición secuencial de dos plumones natales, que solo fue observada entre especies de Buteo neotropicales, para B. brachyurus. La conducta de los pollos se encuadró en los patrones comunes para otras...
Tipo: Journal article
Palavras-chave: Aguilucho chico; Desarrollo del pollo; Descripción del juvenil; Morfometría; Peso de adultos.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300009

Desarrollo Ontogénico de la Columna Vertebral y del Esqueleto Caudal en Larvas de Rhamdia quelen en Condiciones de Larvicultura Intensiva
Provedor de dados: 77
Autores: Hernández,David Roque; Casciotta,Jorge Rafael; Santinón,Juan José; Sánchez,Sebastián; Domitrovic,Hugo Alberto.
Se analiza por primera vez el desarrollo osteológico de la columna vertebral y del esqueleto caudal en larvas de Rhamdia quelen mantenidas bajo condiciones controladas y con alimentación artificial. Entre los días 1 a 20 posteriores a la eclosión (dpe) se muestrearon a intervalos regulares 400 larvas, que se colorearon y transparentaron siguiendo la técnica de Taylor &amp;amp; Van Dike. En los primeros días de vida, las larvas presentan una notocorda recta en toda su longitud. El inicio de la formación de la columna vertebral fue observado a los 7 dpe con la aparición de las espinas neurales y hemales, y entre los 9 y 10 dpe para las tres primeras vértebras. La osificación de la columna vertebral ocurrió en sentido cráneo-caudal y fue completa a los 20...
Tipo: Journal article
Palavras-chave: Rhamdia quelen; Larvicultura; Desarrollo osteológico.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400041

Desarrollo y reproducción de los gametófitos de dos especies chilenas de helechos, Blechnum arcuatum (Blechnaceae) y Pteris semiadnata (Pteridaceae)
Provedor de dados: 73
Autores: Seral,Andrea; Flores-Bavestrello,Alejandra; Gabriel y Galán,José María.
RESUMEN En este trabajo se estudia la germinación, el patrón de desarrollo morfológico y expresión sexual de dos especies de helechos homospóreos que habitan en Chile: Pteris semiadnata y Blechnum arcuatum. Para ello se recolectaron esporas de diferentes esporófitos y se sembraron en cultivos de agar mineral, mantenidos en condiciones controladas. Los máximos porcentajes de germinación observados fueron 82 y 91% para B. arcuatum y P. semiadnata, respectivamente. El patrón de germinación en ambas especies se corresponde con el tipo Vittaria. El patrón de desarrollo morfológico de B. arcuatum se ajusta al tipo Aspidium. Los gametófitos adultos de esta especie presentaron tricomas unicelulares por la superficie de la lámina y el margen, y se comportaron como...
Tipo: Journal article
Palavras-chave: Anteridio; Anteridiógeno; Arquegonio; Patrón de desarrollo morfológico; Germinación.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200346

Descomposición de hojarasca de Pinus radiata y tres especies arbóreas nativas
Provedor de dados: 97
Autores: LUSK,CHRISTOPHER H.; DONOSO,CESAR; JIMÉNEZ,MYLTHON; MOYA,CAROLINA; OYARCE,GISELA; REINOSO,RODRIGO; SALDAÑA,ALFREDO; VILLEGAS,PAOLA; MATUS,FRANCISCO.
En el centro-sur de Chile, las últimas décadas han sido testigo de una conversión masiva de bosques, matorrales y tierras agrícolas a plantaciones de árboles exóticos. Aunque se ha estudiado la influencia de dichos cambios sobre el balance hídrico, los posibles efectos sobre otros procesos ecosistémicos han recibido poca atención. En esta breve comunicación se presentan datos de un estudio de la descomposición de hojarasca de Pinus radiata y tres especies arbóreas nativas, llevado a cabo con el fin de explorar los posibles efectos del reemplazo de bosque nativo por plantaciones exóticas sobre el ciclaje de nutrientes. Se incubaron muestras de las cuatro especies en dos ambientes distintos en sitios colindantes: bajo un bosque nativo secundario, y bajo un...
Tipo: Journal article
Palavras-chave: Área foliar específica; Ciclaje de nutrientes; Nitrógeno foliar; Nothofagus; Plantaciones exóticas.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300016

Descripción Anatómica de Cinco Órganos Internos del Delfín Nariz de Botella (Tursiops truncatus), a Través de la Técnica de Plastinación
Provedor de dados: 77
Autores: Contreras Villanueva,María Dolores; Moreno Colín,Roberto; Sánchez Fabila,Gabriela.
Se plastinaron y describieron cinco órganos internos de delfín nariz de botella (Tursiops truncatus) obteniendo modelos didácticos, inodoros, no tóxicos y perdurables que permiten el arreglo de sus componentes en un contexto inalterado; los especímenes resultantes son opacos y firmes pero no irrompibles, con apariencia similar al estado vivo. Las descripciones anatómicas estuvieron en conformidad con los de los autores presentados dentro de los antecedentes de este estudio, afianzando el conocimiento de que los órganos internos de T. truncatus aquí descritos tipifican a los de los mamíferos en aspectos generales ya que se revela gran uniformidad entre sus elementos estructurales. Por otra parte existen pocos trabajos de anatomía no patológica en delfines,...
Tipo: Journal article
Palavras-chave: Plastinación; Delphinidae; Nariz de Botella; Órganos; Descripción.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200026

Descripción Anatómica de la Inervación del Miembro Pélvico de León Africano (Panthera leo)
Provedor de dados: 77
Autores: Medina Puentes,Rodemil; Morales Muñoz,Pamela; Concha Albornoz,Ismael; Borroni González,Cintya.
El león africano (Panthera leo) pertenece a la familia felidae del orden carnívora, corresponde a un depredador de gran tamaño, en Chile se encuentra únicamente en estado de cautiverio, sin embargo está presente en numerosos zoológicos. La preocupación e interés por el bienestar de estos animales ha aumentado, por lo cual, cada vez se realizan procedimientos médicos de mayor complejidad. Lo expuesto anteriormente genera la necesidad de profundizar los conocimientos anatómicos que existen de esta especie. Por lo anterior, el objetivo de este trabajo fue realizar un estudio anatómico detallado de la inervación del miembro pélvico del león y describir sus relaciones topográficas con el sistema músculo esquelético y vascular. Se disecó un cadáver de león...
Tipo: Journal article
Palavras-chave: León africano; Nervio isquiático; Inervación; Miembro pélvico.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300023

Descripción Anatómica de la Musculatura Intrínseca del Miembro Torácico de León (Panthera leo)
Provedor de dados: 77
Autores: Vargas,J.F; Quintana,O; Barraza,C; Olivares,R.
El presente estudio tuvo como objetivo el describir la musculatura intrínseca del miembro torácico del león africano (Panthera leo). Para tal efecto se utilizó un ejemplar hembra, donado por el Zoológico Metropolitano de Santiago-Chile, fijado y conservado. La disección se llevó a cabo, de proximal a distal, considerando las cuatro regiones topográficas de dicho miembro: Cintura Escapular, Brazo, Antebrazo y Mano. Se discuten y comparan los hallazgos anatómicos observados, con lo descrito para el gato doméstico y trabajos realizados por otros autores en Ocelote (Leopardus pardalis), Puma (Puma concolor) y en la propia especie en estudio. La finalidad del presente trabajo fue aportar al conocimiento de la anatomía de especies exóticas, con proyección médico...
Tipo: Journal article
Palavras-chave: Panthera leo; Miembro torácico; Músculos.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300054

Descripción Anatómica de los Músculos del Miembro Pélvico de Puma (Puma concolor)
Provedor de dados: 77
Autores: Caro-Munizaga,César; Concha-Albornoz,Ismael.
Los carnívoros son animales que ejercen fascinación sobre las personas. Históricamente, han formado parte de la cultura y mitología humana por millones de años. En la medicina, tanto la estructura como la función son inseparables como base y fundamento esta ciencia y arte y en conjunto son asignaturas básicas en la formación médica. El puma es uno de los grandes felinos de los que se conoce su ecología, reproducción y algunos aspectos de su nutrición. Sin embargo, los aspectos relacionados con su anatomía son muy generales. Es probable que por ser un animal protegido, que sólo podría ser obtenido y preservado para estudios sólo bajo condiciones especiales, se prefiera homologar su anatomía con la del gato doméstico por ejemplo. Se realizó una disección...
Tipo: Journal article
Palavras-chave: Veterinaria; Miología; Felinos; Puma.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300055

Descripción Anatómica del Esqueleto de los Tractos Respiratorios Superiores del Periquito Australiano (Melopsittacus undulatus)
Provedor de dados: 77
Autores: Gersenowies Rodríguez,Jorge Ricardo; Sánchez Fabila,Gabriela.
Se describe detalladamente los elementos esqueléticos de los tractos respiratorios superiores de 10 periquitos australianos (Melopsittacus undulatus), dicha descripción permitió encontrar claras diferencias en su anatomía no referidas con anterioridad, debido posiblemente al interés por estudiar la siringe y no los tractos respiratorios completos, el objetivo principal fue describir la morfología y osificación de los tractos respiratorios superiores del periquito australiano, a través de la técnica de transparentación con doble tinción (rojo de alizarina "S" y azul de alciano), que permite observar la osificación de los tractos respiratorios; obteniendo como resultado dos diferencias óseas importantes: (1) la lengua exhibe dos pequeños huesos paraglosales...
Tipo: Journal article
Palavras-chave: Esqueleto lingual; Psittacidae; Siringe; Tráquea; Osificación.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100011

Descripción Anatómica del Músculo Braquiorradial del Tití Gris (Saguinus leucopus Günther, 1877) y el Hallazgo de una Cabeza Accesoria como Variante Anatómica
Provedor de dados: 77
Autores: Vélez García,Juan Fernando; Duque Parra,Jorge Eduardo; Barco Ríos,John.
El Saguinus leucopus es un primate neotropical, endémico y monotípico de Colombia, con escasos estudios sobre su anatomía, en especial de sus músculos, siendo estos un elemento fundamental para la locomoción activa de este primate en los árboles. El objetivo del presente estudio fue describir la anatomía macroscópica del músculo braquiorradial del tití gris (Saguinus leucopus), tomando como base del estudio diez especímenes fijados con formalina al 10%, y a cada uno de ellos se les disecó los dos miembros torácicos de superficial a profundo, describiendo la forma, el origen, la inserción, la inervación y la irrigación del músculo braquiorradial. Se concluye que es un músculo que presenta una morfología, que debe contribuir a los movimientos flexores y...
Tipo: Journal article
Palavras-chave: Antebraquial; Brachioradialis; Codo; Miología; Primate.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100027

Descripción Anatómica del Músculo Extensor del I y II Dedo de la Mano del Zorro Perruno (Cerdocyon thous Linnaeus, 1766)
Provedor de dados: 77
Autores: Vélez García,Juan Fernando; Echeverry Pérez,Juan Sebastián; Sánchez Buitrago,Carlos Arturo.
El zorro perruno (Cerdocyon thous) es el cánido silvestre más común en América del Sur, con una relativa estabilidad poblacional, pero susceptible de ser atropellado y caer en trampas, pudiendo sufrir traumas en sus miembros torácicos, por lo tanto se requiere un conocimiento anatómico específico de sus músculos para intervenciones médicas y quirúrgicas. El objetivo principal de esta investigación fue realizar una descripción anatómica del músculo extensor del I y II dedo del C thous, en la cual, se reporta forma, origen, inserción, inervación e irrigación. Se diseccionaron de superficial a profundo los dos antebrazos de seis especímenes muertos donados por CORPOCALDAS a la Universidad de Caldas. El músculo extensor del I y II dedo en este estudio presentó...
Tipo: Journal article
Palavras-chave: Anatomía; Antebraquial; Canidae; Miología.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400043

Descripción Anatómica, Histológica y Ultraestructural de la Branquia e Hígado de Tilapia (Oreochromis niloticus)
Provedor de dados: 77
Autores: Torres R,G. A; González P,S; Peña S,E.
La tilapia (Oreochromis niloticus) es un pez presente en muchos ecosistemas de agua dulce, en diversas regiones de Colombia. Esta especie es una fuente de alimentación de alta demanda de la población en general, por lo cual es de gran interés que su hábitat acuícola estélibre de contaminantes, con el fin que el especimen se desarrolle y crezca normalmente y asípueda ser consumido por el ser humano sin ningún perjuicio. Las branquias y el hígado de peces son considerados como los órganos primarios donde detectar efectos de polución. Este estudio muestra la morfología normal de las branquias e hígado de tilapia, a través de microscopías: de luz, óptica de alta resolución (MOAR), electrónica de transmisión (TEM) y de barrido (MEB); como un estudio básico para...
Tipo: Journal article
Palavras-chave: Branquia; Hígado; Morfología; Cichlidae.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300008

Descripción Anatómica y Funcional del Húmero del Tití Gris (Saguinus leucopus)
Provedor de dados: 77
Autores: Duque Parra,Jorge Eduardo; Vélez García,Juan Fernando.
El Saguinus leucopus es un primate neotropical, endémico y monotípico de Colombia, con escasos estudios sobre su anatomía, cuya morfología humeral permanece desconocida siendo un elemento fundamental para la locomoción cuadrúpeda de este animal arbóreo. El objectivo del presente estudio fue describir la anatomía macroscópica y la función de los relieves óseos del húmero del titi gris Saguinus leucopus. Se tomaron como base del estudio ocho especímenes fijados con formalina al 10% y de ellos se extrajeron sus húmeros, describiendo las principales funciones de los relieves óseos, como fijaciones musculares y canalizaciones neurovasculares. Los variados relieves anatómicos del húmero del titi gris presentan una disposición morfológica coincidente con sus...
Tipo: Journal article
Palavras-chave: Anatomía; Osteología; Húmero; Primate.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100025

DESCRIPCION DE HUEVOS Y LARVAS DE PRIMER ESTADIO DEL GENERO GYRIOSOMUS GUERIN-MENEVILLE, 1834 (COLEOPTERA, TENEBRIONIDAE, NYCTELIINI)
Provedor de dados: 72
Autores: Pizarro-Araya,Jaime; Jerez,Viviane; Cepeda-Pizarro,Jorge.
Se describe la estructura y ornamentación del exocorion del huevo de siete especies del género Gyriosomus Guérin-Méneville, 1834: G. impressus, G. luczotii, G. elongatus, G. whitei, G. subrugatus, G. curtisi y G. batesi, la morfología del primer estadio larvario de G. luczotii y G. subrugatus y se entregan nuevos antecedentes para G. kingi. Para la obtención de huevos y larvas de estas especies se recolectó en terreno parejas que fueron mantenidas en cajas de crianza hasta la ovipostura y posterior eclosión. La estructura y ornamentación del exocorion del huevo y características morfológicas externas de la larva fueron analizadas mediante microscopía electrónica de barrido. Los resultados muestran que los huevos de Gyriosomus tienen una micropila...
Tipo: Journal article
Palavras-chave: Tenebrionidae; Nycteliini; Gyriosomus; Exocorion; Larva de primer estadio.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200008

Descripción de la dieta del zorro gris, Pseudalopex griseus (Canidae) (Gray, 1869), en el Parque Nacional Sierra de las quijadas, San Luis, Argentina
Provedor de dados: 72
Autores: Núñez,María Beatriz; Bozzolo,Liliana.
La dieta de Pseudalopex griseus (Gray, 1869) fue estudiada mediante el análisis de heces recolectadas en el Parque Nacional Sierra de las Quijadas. El parque representa un ambiente semiárido, con regímenes hídricos estacionalmente marcados. Los resultados obtenidos muestran que el ítem más abundante durante todo el año es el Orden Coleoptera (estación seca 26%; estación húmeda 31%). En la estación seca, el ítem más abundante fueron las cactáceas (12%) y en la húmeda las leguminosas (25%). Otros ítemes presentes en la dieta fueron roedores, aves, escorpiones y gramíneas. Se puede concluir que Pseudalopex griseus se comporta como insectívoro-omnívoro durante todo el año, pero con una marcada preferencia hacia la frugivoría durante la estación seca.
Tipo: Journal article
Palavras-chave: Zorro gris; Dieta.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200002

DESCRIPCIÓN DE LA FLORA VASCULAR EN EL SOTOBOSQUE DE UN BOSQUE PANTANOSO Y DE UNA PRADERA ANTROPOGÉNICA HÚMEDA DE JUNCUS PROCERUS EN EL VALLE DEL RÍO CISNES,REGIÓN DE AYSÉN, CHILE
Provedor de dados: 73
Autores: Promis,Alvaro; Bergh,Giselle; Serra,María Teresa; Cruz,Gustavo.
The richness, abundance and density of vascular flora species were evaluated in the understory of a swamp forest (BP) dominated by Luma apiculata and in an anthropogenic Juncus procerus wet praire (PHJ). The most diverse taxonomical groups were fern in BP and dycotiledon in PHJ. Introduced species were only found in PHJ. Epiphytic hemicryptophytes and climbing phanerophytes are indicator species for BP and hemicryptophyes for PHJ.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100017

DESCRIPCION DE LA HEMBRA Y DE LAS ESTRUCTURAS GENITALES DE CHILESIA ANGULOI RUIZ (LEPIDOPTERA: ARCTIIDAE)
Provedor de dados: 72
Autores: Vargas,Héctor A.; Parra,Luis E.
Se describe la morfología externa de la hembra y la genitalia del macho y de la hembra de Ch. anguloi Ruiz. Los caracteres morfológicos de la genitalia del macho permiten distinguir a esta especie de las restantes que componen el género Chilesia Ruiz: Ch. rudis (Butler) y Ch watsoni Ruiz. El carácter braquíptero de la hembra de Ch. anguloi confirma lo descrito previamente para el género. La hembra de Ch. anguloi puede ser claramente diferenciada de las hembras de Ch. rudis y Ch. watsoni, sobre la base de caracteres morfológicos externos y genitales
Tipo: Journal article
Palavras-chave: Chilesia watsoni; Genitalia; Braquiptería; Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100016

DESCRIPCIÓN DE LA PRIMERA ETAPA DEL CICLO DE VIDA DE TRES GENOTIPOS DE Leucocoryne sp.: SEMILLA A BULBO
Provedor de dados: 113
Autores: de la Cuadra I.,Carlos; Mansur V.,Leví.
Este trabajo describe la etapa de semilla a bulbo de plantas de Leucocoryne sp. cultivadas en Quillota, V Región, Chile (32°53’ lat. Sur; 71°16’ long. Oeste). Los genotipos utilizados fueron Leucocoryne purpurea Gay, Leucocoryne sp. ecotipo Talinay y Leucocoryne sp. ecotipo Alcones, todos originados de la IV Región, Chile. Doscientas semillas por genotipo se pesaron y sembraron en cada una de tres fechas de siembra: septiembre, octubre y noviembre de 1998. A partir de la emergencia, cada dos semanas se tomó una muestra al azar de seis individuos para observar número y forma de la hoja; días a inicio de la bulbificación y senescencia; máxima longitud de la hoja (LH), área foliar (AF) y materia seca de la hoja (MSH); y materia seca (MSB), peso fresco (PFB) y...
Tipo: Journal article
Palavras-chave: Huilli; Glory of the sun; Leucocoryne sp.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000200009

DESCRIPCION DE LAS ESTRUCTURAS GENITALES Y ESTADOS INMADUROS DE PSEUDOCERURA THORACICA BUTLER, 1882 (LEPIDOPTERA: NOCTUIDAE: CUCULLIINAE)
Provedor de dados: 72
Autores: Olivares,Tania S.; Rodríguez,Marcela A.; Navarro,María E.; Angulo,Andrés O.
RESUMEN Se describe el huevo, larva de último estadio y pupa de Pseudocerura thoracica &lt;A HREF="#butler"&gt;Butler, 1882&lt;/A&gt;. Cada uno de estos estados de desarrollo se incluyen en las claves de inmaduros de &lt;A HREF="#olivares"&gt;Olivares et al&lt;/A&gt;. (en prensa), &lt;A HREF="#angulo75"&gt;Angulo &amp;amp; Weigert (1975)&lt;/A&gt; y&lt;A HREF="#angulo01"&gt; Angulo &amp;amp; Olivares (2001)&lt;/A&gt;. Se describen las estructuras de la armadura genital del macho y de la hembra para complementar la información morfológica de la especie. Se entregan fotos y dibujos de los distintos estadios de desarrollo
Tipo: Journal article
Palavras-chave: Cuculliinae; Pseudocerura thoracica Butler; Chile; Genitalia; Huevo; Larva; Pupa.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100004

Descripción de las Láminas Anatómicas de la Universidad de Chile, un Monumento Nacional
Provedor de dados: 77
Autores: Cárdenas Valenzuela,Julio L; Dinator Esterio,Michele; Madariaga Lagunas,Jorge.
Bajo el Anfiteatro de Anatomía del Instituto de Anatomía de la Universidad de Chile, construido en 1921, se encontraron en el año 2003, 475 láminas anatómicas además de 5 litografías utilizadas para la docencia de la disciplina en el siglo XIX. Muchas generaciones, incluso de docentes de Anatomía Normal que pasaron por las aulas desconocieron tanto su existencia como la importancia cultural que tenían. Con el objeto de remediar esta situación y de preservarlas es que se inicia ese año un registro digital de todas estas obras como una forma de darle valor y la importancia que dicho material tiene y lograr su protección futura. Dispuestas por áreas temáticas, las láminas fueron realizadas por alumnos, docentes y personas externas como una herramienta más que...
Tipo: Journal article
Palavras-chave: Láminas anatómicas; Enseñanza Anatomía; Monumento nacional.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200052

DESCRIPCION DE LOS ESTADOS PREIMAGINALES DE HEMIEUXOA CONCHIDIA (BUTLER)
Provedor de dados: 72
Autores: Louis-Maldonado,Miguel; Badilla,Rubén.
Se describen los estados preimaginales (huevo, larva y pupa) de Hemieuxoa conchidia (Butler). Se ubican en las claves de &lt;A HREF="#Angulo1975"&gt;Angulo y Weigert 1975&lt;/A&gt; para larva y pupa y en Angulo y Weigert 1977 para huevo. Se incluyen figuras
Tipo: Journal article
Palavras-chave: Chile; Clave; Hemieuxoa conchidia; Inmaduros; Huevo; Larva; Pupa; Lepidoptera.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200004

Descripcion de los huevos de Copitarsia incommoda (Walker) y Copitarsia turbata (Herrich-Schaeffer) (Lepidoptera: Noctuidae: Cuculliinae)
Provedor de dados: 72
Autores: Olivares,Tania S.; Angulo,Andrés O.
Se describe la ultraestructura de los huevos de las especies gemelas de importancia económica de Copitarsia turbata (Herrich-Schaeffer) y Copitarsia incommoda Walker. Los huevos de dichas especies se distinguen por la forma, disposición y número de costas transversales, celdas primarias, celdas secundarias, micropilas y aeropilas. Se entregan las fotografías al microscopio electrónico de barrido de las diferentes estructuras
Tipo: Journal article
Palavras-chave: Cuculliinae; Ultraestructura; Estados inmaduros; Morfología.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100013

DESCRIPCION DE UNA NUEVA ESPECIE DE ARTHROBRACHUS SOLIER, 1849 PARA CHILE: ARTHROBRACHUS ARUMA N. SP. (COLEOPTERA: MELYRIDAE)
Provedor de dados: 72
Autores: Estrada,Patricia.
Se describe una nueva especie para el género Arthrobrachus Solier (1849), A. aruma n.sp. la que presenta apomorfías tales como antenas pectinadas y reborde lateral del pronoto mal definido, caracteres únicos en el grupo. La especie ha sido registrada sólo en la Cordillera de Doña Ana, IV Región, Chile
Tipo: Journal article
Palavras-chave: Coleoptera; Melyridae; Arthrobrachus; Nueva especie; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200005

Descripción del Somatotipo e IMC en una Muestra de Adolescentes de Colegios Municipalizados de la Ciudad de Temuco - Chile
Provedor de dados: 77
Autores: Martínez,Cristian; Silva,Héctor; Collipal,Erika; Carrasco S,Vanessa.
La mal nutrición en el mundo se ha convertido en un problema de salud pública, similar situación ocurre en Chile. Los estudios del índice de masa corporal (IMC), de la composición corporal, estado nutricional, de la población, son los parámetros recomendados por la OMS (Organización Mundial de la Salud), para conocer el estado nutricional. Realizamos este estudio para describir la realidad nutricional de los adolescentes de los colegios municipalizados de la ciudad de Temuco. Evaluamos 993 adolescentes de ambos sexos, 543 hombres (54,7%) y 450 mujeres (45,3%), entre 6 y 14 años de edad, alumnos de diferentes colegios urbanos municipalizados. Para obtener el somatotipo utilizamos el método antropométrico descrito por Heath &amp;amp; Cárter, efectuándose la...
Tipo: Journal article
Palavras-chave: Somatotipo; Antropometría; Índice de masa corporal.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300023

Descripción del Somatotipo y Cualidades Físicas de Varones Surfistas Experimentados Chilenos
Provedor de dados: 77
Autores: Valdés V,María Ignacia; Guzmán-Venegas,Rodrigo.
El surf es un deporte que ha incrementado su número de adeptos en Chile. Sin embargo, existen pocos estudios que describan las características antropométricas y físicas de estos deportistas en el medio nacional. Este estudio observacional descriptivo transversal, tuvo por objetivo describir las características antropométricas y físicas de surfistas experimentados chilenos. En 15 surfistas chilenos experimentados (edad: 27,1±5,2; talla: 1,77±0,04; peso: 74,1±6,3) se evaluó el somatotipo, control postural, los saltos Squat Jump (SJ) y Counter Movement Jump (CMJ), y el consumo máximo de oxígeno (VO2 Max.). El somatotipo promedio de la muestra fue endomorfo (2,7±0,5), mesomorfo (4,6±0,7) y ectomorfo (2,3±0,6). En la prueba de estabilidad postural se obtuvo un...
Tipo: Journal article
Palavras-chave: Surf; Somatotipo; Control postural; Salto vertical jump; VO2 Max.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100004

Descripción del último estado larvario y recopilación de registros de hospederos de siete especies de Tortrícidos de importancia económica en Chile (Lepidoptera: Tortricidae)
Provedor de dados: 72
Autores: Cepeda,Danilo E; Cubillos,Guadalupe E.
Se entregan nuevos antecedentes para siete especies de Tortrícidos de importancia económica en Chile, de acuerdo al estudio de ejemplares criados en condiciones de laboratorio. Esto comprende, principalmente, una descripción del último estado larvario basada en la quetotaxia, una recopilación de registros de hospederos y nuevas citas.
Tipo: Journal article
Palavras-chave: Cydia; Grapholita; Lobesia; Chileulia; Proeulia; Quetotaxia.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000100004

Descripción fenotípica y avances en la obtención de un inmunógeno contra partículas de virus ISA (HPR7b), aisladas desde un salmón del Atlántico de vida libre capturado en el ecosistema Sur-Austral de Chile
Provedor de dados: 72
Autores: Krautz,María Cristina; Palma,Gabriela; González,Margarita; Cruzat,Fernando; González,Rodrigo R.
Se aislaron partículas del virus ISA cepa HPR7b, desde un salmón Atlántico capturado en el ecosistema Sur Austral de Chile. Se describe por primera vez la morfología de este genotipo mediante microscopía electrónica de transmisión. Se estimuló la producción de anticuerpos policlonales contra esta cepa en conejos: observándose respuesta positiva de hemaglutinación a partir del segundo sangrado.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300009

Descripción Histológica de la Cámara Incubatriz de Moina hutchinsoni (Brem, 1937)
Provedor de dados: 77
Autores: Góngora-Landeros,Elizabeth; Uría-Galicia,Esther A; Martínez-Jerónimo,Felipe Fernando; López-Villegas,Edgar Oliver.
Los cladóceros son partenogenéticos por lo que la mayor parte del año, las poblaciones consisten enteramente de hembras que se reproducen asexualmente, en ellas el ovario se comunica por medio de un oviducto, con la cámara incubatriz, la cual se localiza en el margen interno posterior del caparazón, cerca del corazón y antes del intestino. Los huevos provenientes de los oviductos se depositan en la cámara y se incuban hasta terminar el desarrollo embrionario. Se considera que Moina presenta un desarrollo postembrionario directo, porque los organismos juveniles o neonatos, salen completamente formados e independientes durante la muda. En la reproducción asexual la cámara contiene a las diferentes etapas del desarrollo embrionario llamadas; ovocito, huevo y...
Tipo: Journal article
Palavras-chave: Moina hutchinsoni; Ultraestructura; Cámara incubatriz; Efipio; Desarrollo embrionario.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400007

Descripción Histológica de las Glándulas Anexas del Aparato Digestivo de Avestruz (Struthio camelus var. domesticus)
Provedor de dados: 77
Autores: Illanes,J; Fertilio,B; Quijada,M; Leyton,V; Verdugo,F.
En la última década, la crianza del avestruz en Chile ha ido aumentando sustancialmente, por lo cual se ha hecho necesario incrementar los estudios para mejorar la producción de esta especie. La literatura señala sólo estudios sobre la fisiología y anatomía de esta especie. Nuestro objetivo es aportar al conocimiento de la histología normal de las glándulas anexas al aparato digestivo. Esta investigación se realizó con 6 avestruces clínicamente sanas, de las que se obtuvieron muestras representativas del hígado, pro ventrículo y páncreas. Se realizaron cortes histológicos, los que fueron teñidos y montados para su análisis comparativo bajo microscopio de luz, entre avestruz y gallina. La histología de las glándulas anexas del aparato digestivo es semejante...
Tipo: Journal article
Palavras-chave: Avestruz; Glándulas; Aparato Digestivo.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400001

Descripción Histológica de los Diferentes Segmentos del Aparato Digestivo de Avestruz (Struthio camelus var. domesticus)
Provedor de dados: 77
Autores: Illanes,J; Fertilio,B; Chamblas,M; Leyton,V; Verdugo,F.
La expansión y rápido desarrollo de la crianza de ratites, ha implicado desafíos científicos y técnicos para enfrentar este nuevo tipo de explotación en Chile. El avestruz (Struthio camelus var. domesticus), es un ave herbívora, forrajera y altamente selectiva, que presentan semejanzas y diferencias con otras aves y herbívoros, entre ellos los rumiantes. Se conoce bastante sobre su anatomía gastrointestinal, sin embargo, su histología no ha sido investigada en profundidad. Para este análisis, se obtuvieron muestras de los diferentes segmentos del tubo digestivo de 6 avestruces adultas, clínicamente sanas. Se procesaron de acuerdo a las técnicas de histología corriente y analizadas al microscopio óptico. El avestruz muestra un esófago con pliegues...
Tipo: Journal article
Palavras-chave: Avestruz; Histología; Aparato Digestivo.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300015

Descripción Histológica de los Diferentes Segmentos del Aparato Respiratorio de Avestruz (Struthio camelus var. Domesticus)
Provedor de dados: 77
Autores: Illanes,Julio; Leitchle,Jorge; Leyton,Victor; Tapia,Luis Felipe; Fertilio,Bárbara; Castro,Mario.
Debido al creciente interés actual en la industria del avestruz (Struthio camelus var. domesticus) y al escaso material bibliográfico referente a la morfología del aparato respiratorio, se ha propuesto analizar comparativamente el segmento laringo traqueo siringeo pulmonar de esta especie, con el objeto de contribuir en esta área. El estudio se realizó con seis avestruces clínicamente sanos, de los cuales se obtuvieron muestras representativas del segmento laringo traqueo siringeo pulmonar. Las muestras fueron procesadas de acuerdo a las técnicas histológicas de rutina para luego realizar un análisis morfológico comparativo con la gallina (Gallus gallus). En el avestruz el cartílago aritenoides es par y está situado en posición dorsal y craneal a la...
Tipo: Journal article
Palavras-chave: Avestruz; Histología; Aparato Respiratorio.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400033

Descripción histológica del ojo de Panaque nigrolineatus (Siluriformes: Loricariidae) y sus implicaciones ecomorfológicas
Provedor de dados: 97
Autores: CORCHUELO,SHERYLL; CALDAS,MARIA L; PEÑA,RENATO; HURTADO,HERNÁN; TOVAR,MARIO O.
La cucha real (Panaque nigrolineatus) es endémica de las cuencas del Orinoco y Amazonas. La información relacionada con el sistema visual de esta especie es muy escasa, a pesar de ser un sentido fundamental en la interacción del individuo con su ambiente. Los especímenes se clasificaron en dos grupos en base a su tamano corporal: pequenos (longitud estándar (media ± DE) de 5.92 ± 1.43 cm y peso promedio de 8.50 ± 6.8 g) y grandes (longitud estándar (media ± DE) de 15.9 ± 0.69 cm y peso promedio de 142.48 ± 18.71 g). En los ejemplares pequenos, el ojo presentó una morfología redondeada, y en los de mayor tamano presentó una morfología ligeramente alargada. Se obtuvieron cortes histológicos de 7 &amp;#956;&amp;#951;&amp;#953; que fueron coloreados con las...
Tipo: Journal article
Palavras-chave: Colombia; Ecomorfología; Papilas de nervio óptico; Sistema visual.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000200006

Descripción Histológica e Histoquímica del Hígado de Cobayo (Cavia porcellus)
Provedor de dados: 77
Autores: Rosas C,Carlos; Vásquez P,Bélgica; del Sol,Mariano.
Si bien se han realizado estudios en el hígado de variadas especies, hay pocas investigaciones en cobayo, un roedor de fácil manejo y usado como animal de experimentación. El objetivo de este estudio fue describir en el hígado de cobayo, algunos aspectos histológicos e histoquímicos, lo cual permitiría realizar estudios experimentales. Se utilizaron 7 cobayos (Cavia porcellus) machos, obtenidos del Bioterio de la Universidad de La Frontera, Temuco, Chile. Las muestras fueron fijadas en formalina tamponada y procesadas para su inclusión en paraplast. Se realizaron cortes seriados de 5 µm, los que fueron teñidos para estudios histológico e histoquímico. El hígado presentó una arquitectura lobulillar con límites poco definidos y espacios porta constituidos...
Tipo: Journal article
Palavras-chave: Cobayo; Hígado; Hepatocito.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100021

Descripción morfológica y diferenciación de dos estados de desarrollo de la larva de Oxelytrum lineatocolle (Laporte 1840) (Coleoptera: Silphidae)
Provedor de dados: 72
Autores: TOSTI-CROCE,EDOARDO; OSES,CHRISTOPHER; ORTLOFF,ALEXANDER; DE LA FUENTE,JUAN CARLOS.
Se describen morfológicamente dos distintos estados de desarrollo de la larva de Oxelytrum lineatocolle y se reporta por primera vez en cadáveres humanos. Se sugiere que la relación de la longitud de los segmentos de los urogonfios permite identificar estados de desarrollo larval. Además, se describen cuatro caracteres de las "larvas maduras" del género Oxelytrum que permiten diferenciar tres especies presentes en el Neotrópico. La utilidad forense de ésta y otras larvas de coleópteros necrobiontes depende de una correcta identificación, a nivel específico y de estados de desarrollo.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200007

Description of space-time variability of the potential productivity of Acacia caven espinales based on MODIS images and the Enhanced Vegetation Index (EVI)
Provedor de dados: 118
Autores: Gerstmann,Catalina; Miranda,Marcelo; Condal,Alfonso.
Acacia caven espinales are important communities of sclerophyllus vegetation in central Chile. To increase its productivity, it is necessary to study the community’s condition, their relationships with the surrounding environment and the interactions between them. The present study was carried out in a series of three years: 2004, 2005 and 2006. The 68 EVI images used represent the amount of radiation absorbed and emitted (from a Moderate Resolution Imaging Spectroradiometer) for the vegetation, which is related to the photosynthetic performance. The results show that during the summer and autumn seasons, there was more space homogeneity and less photosynthetic activity and potential productivity of the communities; in winter and spring, the period in...
Tipo: Journal article
Palavras-chave: Acacia caven; Potential productivity; EVI; MODIS; Spatial anisotropy.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100006

DESCRIPTION OF THE FEMALE OFF GRIMPOTEUTHIS BRUUNI VOSS, 1982
Provedor de dados: 72
Autores: Vega Petkovic,Marco A.
This study mentions the first female of Grimpoteuthis bruuni collected in fishery of crustaceous of Chilean water. With base in the morphology, the female can be separated clearly from the males of the same species and another species of the genus Grimpoteuthis. The specimen this deposited in the collection of cephalopods of the National Museum of Natural History of Santiago of Chile
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200011

Description of the immatures of Linepithema humile Mayr (Hymenoptera: Formicidae)
Provedor de dados: 48
Autores: SOLIS,DANIEL R; FOX,EDUARDO G. P; ROSSI,MÔNICA L; BUENO,ODAIR C.
Linepithema humile Mayr is an ant species originally native to South America that has been spread accidently throughout the globe through international trade. It is a serious urban and crop pest. Despite its economic importance, little is known about the larvae of this species apart from a brief description based on a few specimens. The present investigation is aimed at describing every immature stage of L. humile. Three larval instars were determined through the frequency distribution of the maximum width of head capsules from a sample of 525 larvae. The morphological descriptions were based on 150 eggs, 70 larvae, and 90 pupae examined by light and scanning electron microscopy. Some morphological characteristics reported to be typical of Linepithema Mayr...
Tipo: Journal article
Palavras-chave: Argentine ant; Dolichoderinae; Dolichoderini; Iridomyrmex humilis; Larval instars; Tramp species.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000100004

Description of two new species of Malacoceros and Rhynchospio spionids (Polychaeta: Spionidae) from the Grand Caribbean region
Provedor de dados: 97
Autores: DELGADO-BLAS,V. HUGO; DÍAZ-DÍAZ,ÓSCAR.
Two new species of spionids are described from the Caribbean Sea, Malacoceros cariacoensis n. sp. from Venezuela and Rhynchospio harrisae n. sp. from Guana in the Virgin Islands, British Virgin Island. Malacoceros cariacoensis n. sp. can be differentiated by the shape of the prostomium, which has two short frontal horns and the posterior portion laterally prolonged into a faintly demarcated, double-looped nuchal organ, extending to the base of setiger 2, a reduction in the size of setiger 1, the absence of body pigmentation, and the number of apical teeth on the hooded hooks. Rhynchospio harrisae n. sp. differs from other species of the genus in that the peristomium is moderately developed with low lateral wings, and the anterior notopodial setae are...
Tipo: Journal article
Palavras-chave: Caribbean; Malacoceros; Rhynchospio; Spionidae; Taxonomy.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000200006

Descriptive Anatomy of Lateral Digital Extensor Muscles of the Hand of the White-Footed Tamarin (Saguinus leucopus Günther, 1876)
Provedor de dados: 77
Autores: Vélez García,Juan Fernando; Duque Parra,Jorge Eduardo; Barco Ríos,John.
The Saguinus leucopus is an endemic and monotypic primate of Colombia with quadrupedal arboreal locomotion, but the study of its morphological adaptations are still scarce, therefore the specific knowledge of its muscles will allow to understand these adaptations and to establish better medical and surgical procedures in order to preserve this species. For this purposes, the two forearms of 10 S. leucopus specimens were dissected, they were fixed within a formaldehyde solution, phenic acid and mineral oil mixture. Among the craniolateral muscles of the forearm two muscles were independent for digits IV and V. They presented form, origin and insertion suitable for individual extension of each digit, with innervation and irrigation by the cranial...
Tipo: Journal article
Palavras-chave: Antebrachial region; Extensor digiti quarti proprius muscle; Extensor digiti quinti proprius muscle; Myology; Primate.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300050

Desempeño fisiológico, estacionalidad y plasticidad fenotípica  en pequeños mamíferos: microevolución de la capacidad de cambio en rasgos termorregulatorios
Provedor de dados: 97
Autores: NESPOLO,ROBERTO F.
Los ajustes fisiológicos que por aclimatación térmica modifican el fenotipo a corto plazo tendrían una importancia central en aquellos pequeños mamíferos que habitan ambientes térmicamente fluctuantes. Bajo la premisa de que esta capacidad de cambio es adaptativa, en las últimas décadas un gran número de trabajos ha reportado y discutido el patrón desde variadas perspectivas. Sin embargo, esta premisa ha estado siempre relegada a las discusiones y muy pocas veces se ha puesto a prueba teórica o empíricamente, a pesar de que la biología evolutiva y la genética cuantitativa han desarrollado extensamente las herramientas para hacerlo. Creo que esta desconexión histórica se debe a un número de factores ya mencionado previamente por varios autores, que se...
Tipo: Journal article
Palavras-chave: Matriz de varianza-covarianza genética aditiva; Gradiente de selección; Norma de reacción; Endotermia; Tasa metabólica.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300019

Desiccation tolerance in Dendroligotrichum dendroides (Brid. ex Hedw.) Broth. from two Chilean populations with contrasting precipitation
Provedor de dados: 73
Autores: ATALA,CRISTIAN; ALFARO,JUAN FELIPE; PARRA,MARÍA JOSÉ; SALDAÑA,ALFREDO.
Mosses are poikilohydrous non-vascular plants, usually with some degree of desiccation tolerance. Dendroid mosses have conducting tissues that make them analogous to vascular plants. Functional studies on these mosses, however, are scarce. Dendroligotrichum dendroides is a dendroid moss that occurs in Chile in the understory of temperate forests where it can be exposed to summer drought. We studied desiccation tolerance and rehydration capacity on D. dendroides from two populations with contrasting precipitation. We sampled plants from the northern part of their distribution (Contulmo, Araucanía district; lower precipitation), and from a southern population in Katalapi (Los Lagos district; higher precipitation). We measured relative water content and...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100003

Design and expression of a retro doublet of cecropin with enhanced activity
Provedor de dados: 69
Autores: Díaz,Mauricio; Arenas,Gloria; Marshall,Sergio H.
Novel doublet molecules of cecropin A from Drosophila melanogaster were designed and constructed combining the regular (CECdir) with the inverted (CECret) coding sequence of the standard CEC A1 gene resulting in the following configurations: CECdir-CECret and CECret-CECdir. These two recombinant molecules were generated using a three-primer driven PCR reaction yielding composite single functional aminoacidic molecules with the coding sequences of CECdir linked in frame with the coding sequence of CECret and vice versa. In order to obtain these constructions, a retropeptide DNA-coding sequence was chemically synthesized to match the expected polarity of the newly generated CECret sequence. Both doublet antimicrobial peptides (drAMPs) were cloned in the T7...
Tipo: Journal article
Palavras-chave: Antimicrobial peptides; Escherichia coli; Expression.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200006

Design and Management of Irrigation Systems
Provedor de dados: 117
Autores: Holzapfel,Eduardo A; Pannunzio,Alejandro; Lorite,Ignacio; Silva de Oliveira,Aureo; Farkas,István.
Irrigation systems should be a relevant agent to give solutions to the increasing demand of food, and to the development, sustainability and productivity of the agricultural sector. The design, managing, and operation of irrigation systems are crucial factors to achieve an efficient use of the water resources and the success in the production of crops and orchards. The aim of this paper is to analyze knowledge and investigations that enable to identify the principal criteria and processes that allow improving the design and managing of the irrigation systems, based on the basic concept that they facilitate to develop agriculture more efficient and sustainable. The design and managing of irrigation systems must have its base in criteria that are relevant,...
Tipo: Journal article
Palavras-chave: Irrigation; Design; Water management; Operation systems.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000500003

Designing and validation of genus-specific primers for human gut flora study
Provedor de dados: 69
Autores: Rekha,Rani; Alam Rizvi,Moshahid; Jaishree,Paul.
The aim of this study, was to design and validate 16S rRNA targeted oligonucleotide genus specific primers for amplifying the predominant members of gut flora using polymerase chain reaction. Primers were validated against human faecal samples. Gut flora of a normal individual was compared with that of two diseased individuals. Our observations showed that the genera Lactobacillus, Bacteroides, Peptococcus, Bifidobacterium, and E. coli were invariably present in all studied subjects however, the absence of butyrate producing bacteria Ruminococcus and Peptostreptococcus were significant. Presence of the members of the genus, Campylobacter in both the diseased samples were also unusual.
Tipo: Journal article
Palavras-chave: 16S rRNA based primers; Anaerobic bacteria; Diarrhoea patient; Polymerase chain reaction.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500005

Desinfección de cariopses y regeneración de plantas de Spartina argentinensis
Provedor de dados: 118
Autores: Bueno,Midan S; Feldman,Susana R; Ortiz,Juan P.
Se desarrolló un protocolo de desinfección y regeneración in vitro de Spartina argentinensis. El menor porcentaje de contaminación se obtuvo tratando los cariopses por 60 s en etanol 90° y 20 min de inmersión en hipoclorito de sodio al 2,5% con Tween 20. La inducción de callos se realizó en medio Murashige y Skoog (MS) suplementado con 0,5 mg•L-1 de ácido diclorofenoxi acético (2,4-D) y 1 mg•L-1 de ácido indol acético (AIA). La mayor (20%) regeneración de vastagos se logró con igual base salina y 0,25 mg•L-1 de bencilamino purina (BAP). Se utilizó 0,025 mg•L-1 de ácido naftalen acético para la regeneración de raíces. Las plantas se regeneraron vía organogénesis. Este protocolo es la primera mención de regeneración de plantas de S. argentinensis utilizando...
Tipo: Journal article
Palavras-chave: Rganogénesis; Regeneración in vitro; Spartina.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000300007

Desmoplasic Ameloblastoma in Maxilla: Report of Case and Review of the Literature
Provedor de dados: 77
Autores: Alves,Pollianna Muniz; Pereira,Karuza Maria Alves; Vasconcelos,Marcelo Gadelha; Souza,Lélia Batista de; Queiroz,Lélia Maria Guedes de; Medeiros,Ana Myriam Costa.
The ameloblastoma is a benign neoplasm of epithelial odontogenic origin, slowly growing, locally invasive and it is the most common odontogenic tumor in the jaws. Histologically, various types have been described in literature. The desmoplastic variant is rare and characterized by difference in the typical findings of ameloblastoma, including localization, radiographic and histological features. The purpose of this article is to report a case of desmoplastic ameloblastoma in the left maxilla, and review of relevant literature, emphasizing peculiar aspects of this unusual lesion.
Tipo: Journal article
Palavras-chave: Ameloblastoma; Desmoplastic Ameloblastoma; Odontogenic tumours.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200003

Desplazamiento de Conidias de Metarhizium anisopliae var. anisopliae en Columnas de Tres Series de Suelo
Provedor de dados: 113
Autores: Salazar P,Ana María; Gerding G,Macarena; France I,Andrés; Campos P,Jorge; Gerding P,Marcos; Sandoval E,Marco.
El hongo entomopatógeno Metarhizium anisopliae, aislamiento Qu-M270, es específico para el control del gusano blanco del trigo (Hylamorpha elegans Burm.), el cual se alimenta de raíces de diversos cultivos y se desplaza en el perfil del suelo hasta los 25 cm de profundidad. En este estudio se evaluó el desplazamiento vertical de conidias de Qu-M270, en suspensión acuosa, a través de columnas de suelo extraídas con tubos de PVC de 30 cm de largo y 20 cm de diámetro, en tres series de suelo de la Región del Bío-Bío (36°32’ lat. Sur; 71°55’ long. Oeste), Chile. La recuperación de conidias se realizó en medio especifico para Metarhizium anisopliae, contabilizando unidades formadoras de colonias por gramo de suelo seco. La serie Quella (Aquic Durixerets) fue...
Tipo: Journal article
Palavras-chave: Control biológico; Hongo entomopatógeno; Infiltración; Biopesticida.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000300002

Desplazamiento de los Puntos de Referencia Craneales Utilizados en los Análisis Cefalométrico de Jarabak y Ricketts, Durante el Crecimiento Activo
Provedor de dados: 77
Autores: Díaz,Patricia V; Araya-Díaz,Pamela; Palomino,Hernán M.
El objetivo de este trabajo fue evaluar el desplazamiento de los puntos craneales: Nasion, Silla, Basion, Porion, Orbitario y Pterigoideo, utilizados como referencia en los análisis cefalométricos de Jarabak y Ricketts durante el crecimiento activo. Se seleccionaron 120 telerradiografías de perfil en formato digital, correspondientes a 60 pacientes con 2 telerradiografías cada uno, tomadas con un intervalo de tiempo mínimo de 1 año (T1 y T2), en donde T1 se encuentra antes o durante el peak de crecimiento según el Estado de Maduración Cervical Vertebral (CVM) I, II ó III de Baccetti y T2 en estadio CVM IV,V,VI (después del peak de crecimiento). Un examinador previamente calibrado, ubicó los puntos analizados y para evaluar su desplazamiento, se realizaron...
Tipo: Journal article
Palavras-chave: Puntos de referencia; Crecimiento Craneofacial; Cefalometría.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100036

Detección de b-Amiloide, Proteína TAU Hiperfosforilada y Ubiquitina por Técnica de Inmunohistoquímica en Cerebros de Caninos Mayores de 10 Años
Provedor de dados: 77
Autores: Briones S,Flavio; Cáceres D,Tamara; Jarpa F,Marcia.
El interés en el estudio del proceso de envejecimiento cerebral y los cambios comportamentales relacionados con la edad en caninos y felinos geriátricos ha aumentado en la última década (Mentzel, 2005a; Ingram &amp;amp; Williams, 2010). Las alteraciones del comportamiento canino que responden a cambios fisiopatológicos relacionados con la edad y que involucran distintas esferas conductuales y cognitivas, se engloban bajo la denominación de Síndrome de Disfunción Cognoscitiva (SDC) (Mentzel, 2005b). El cual fue descrito en 1997 y se observó en perros de más de 9 años (Ingram &amp;amp; Williams). El Síndrome de Disfunción Cognoscitivo (SDC) es también llamado Alzheimer canino por las similitudes histopatológicas cerebrales y conductuales relacionadas. En el...
Tipo: Journal article
Palavras-chave: Cognoscitiva; Inmunohistoquímica; Amiloide; Proteína TAU; Ubiquitina.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400043

DETECCIÓN DE UN DEFECTO GENÉTICO EN BOVINOS MEDIANTE UNA PRUEBA DE ADN.
Provedor de dados: 113
Autores: Felmer D.,Ricardo; Butendieck B.,Norberto; Butendieck B.,Bárbara; Villegas M.,Juana.
La deficiencia en la capacidad de unión de leucocitos bovinos a los antígenos, más conocida como BLAD, es una enfermedad hereditaria que resulta letal para el ganado de la raza Holstein. Su principal característica es ser una enfermedad autosómica recesiva que puede ser transmitida a la descendencia. El objetivo del trabajo fue estandarizar la metodología para realizar un diagnóstico de la enfermedad mediante técnicas moleculares y lograr una primera aproximación sobre la frecuencia génica del alelo mutado en algunas poblaciones de toros de la IX y X Región. En base a la amplificación del ADN mediante reacción en cadena de polimerasa (PCR) y posterior digestión con enzimas de restricción Taq I y Hae III, fue posible visualizar, mediante electroforesis en...
Tipo: Journal article
Palavras-chave: Deficiencia de adhesión leucocitaria bovina; BLAD; PCR; RFLP; Holstein; Enfermedad.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100005

Detección del Polimorfismo en el Gen del Receptor de Melatonina (MT1) en la Oveja Criolla Araucana
Provedor de dados: 77
Autores: Quiñones,J; Bravo,S; Paz,E; Sepúlveda,N.
La melatonina es una hormona que regula los ciclos circadianos y muchos de los aspectos reproductivos de los mamíferos y es secretada por la glándula pineal en las horas de ausencia de luz. Esta hormona posee receptores de alta afinidad acoplados a proteínas de tipo G, denominados MT1. Un polimorfismo de la secuencia que codifica para estos receptores estaría involucrado en el control de la reproducción estacional de los ovinos. El propósito de este estudio busca determinar la presencia del polimorfismo del receptor MT1 en la oveja criolla Araucana, un ovino local en el que se ha registrado un corto anestro reproductivo. Para poder realizar este trabajo se utilizó la técnica denominada reacción en cadena de la polimerasa para polimorfismo en el tamaño de...
Tipo: Journal article
Palavras-chave: Reproducción ovina; Anestro; Marcadores moleculares.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200030

DETECCIÓN DEL VIRUS DEL MOSAICO DE LA ALFALFA EN REGIONES PRODUCTORAS DE FREJOL (Phaseolus vulgaris L.) EN CHILE
Provedor de dados: 113
Autores: Sepúlveda R.,Paulina; Morales,Francisco; Castaño,Mauricio.
En los últimos años se han observado plantas de frejol (Phaseolus vulgaris) con síntomas característicos de una enfermedad viral. Durante las temporadas 1993/1994 y 1995/1996 se realizaron prospecciones de campos de frejol en la zona productora (V a la VIII Región) de Chile. Se colectaron un total de 173 muestras de plantas afectadas por diferentes síntomas de posible etiología viral. Las plantas fueron sometidas a la prueba de ELISA con un antisuero para el Virus del Mosaico de la Alfalfa (AMV). Se determinó que era el AMV, el cual estaba distribuido en el área productora de frejol de Chile, pero con una frecuencia de detección relativamente baja, del 2 y 4% respectivamente, para las temporadas mencionadas. El procedimiento descrito junto con la...
Tipo: Journal article
Palavras-chave: AMV; Aislamiento de virus; ELISA.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000300012

Detección Inmunohistoquímica del Receptor de Estrógeno en el Endometrio de Ovejas de Alta Prolificidad y de Prolificidad Estándar
Provedor de dados: 77
Autores: Vasconcellos C,Adriana; Paredes H,Marco.
Uno de los factores que incide en la capacidad reproductiva de los ovinos es la presencia de receptores de estrógeno en el tracto genital, donde regulan la expresión de numerosos genes comprometidos en su desarrollo morfológico y funcional. Posiblemente el desempeño reproductivo de diferentes razas de ovejas podría estar determinado por la expresión diferencial de estos receptores. En el presente estudio, se evaluó comparativamente el nivel de expresión del receptor de estrógeno en tejido endometrial de ovejas prepúberes de alta prolificidad (raza Texel) y de prolificidad estándar (raza Araucana) mediante análisis inmunohistoquímico. Se concluye que el nivel de expresión del receptor de estrógeno en tejido estromal, epitelial, de revestimiento y glandular...
Tipo: Journal article
Palavras-chave: Ovejas; Endometrio; Receptor estrógeno; Texel; Araucana.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300054

Detección Molecular de Estreptococos Cariogénicos en Saliva
Provedor de dados: 77
Autores: Salazar,Luis A; Vásquez,Claudio; Almuna,Alejandro; Oporto,Gonzalo; Santana,Roberto; Herrera,Christian L; Sanhueza,Antonio.
Streptococcus mutans y Streptococcus sobrinus han sido indicados como los principales agentes etiológicos de la caries dental. Sin embargo, los métodos microbiológicos y bioquímicos, disponibles actualmente en Chile, no permiten la rápida detección e identificación de estas bacterias. El objetivo de este trabajo fue implementar la metodología de reacción en cadena de la polimerasa (PCR) para detectar la presencia de S. mutans y S. sobrinus en saliva. Participaron de este estudio 51 escolares (5 a 17 años), provenientes de cinco diferentes colegios de la ciudad de Temuco; a los cuales se les realizó recuento de estreptococos del grupo mutans en saliva por método microbiológico y la diferenciación de especies por la técnica de PCR. Los resultados mostraron...
Tipo: Journal article
Palavras-chave: Caries; Streptococcus mutans; PCR.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400027

Detecting adventitious transgenic events in a maize center of diversity
Provedor de dados: 69
Autores: Gamarra,Luis Fernando Rimachi; Delgado,Jorge Alcántara; Villasante,Yeny Aquino; Ortiz,Rodomiro.
Background: The genetic diversity of maize in Peru includes several landraces (within race clusters) and modern open pollinated and hybrid cultivars that are grown by farmers across various regions, thereby making this country a secondary center of diversity for this crop. A main topic of controversy in recent years refers to the unintended presence of transgenic events in locally grown cultivars at main centers of crop diversity. Peru does not yet have biosafety regulations to control or permit the growing of genetically modified crops. Hence, the aim of this research was to undertake a survey in the valley of Barranca, where there were recent claims of authorized transgenic maize grown in farmers fields as well as in samples taken from feed storage and...
Tipo: Journal article
Palavras-chave: Biosafety; Corn; Sampling; Transgenes; Zea mays.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400009

Detection of Coronavirus in Capybaras (Hydrochoeris hydrochaeris) by Transmission Electron Microscopy in São Paulo, Brazil
Provedor de dados: 77
Autores: Catroxo,M. H. B; Miranda,L.B; Lavorenti,A; Petrella,S; Melo,N. A; Martins,A. M. C. P. R. F.
Coronaviruses are enveloped, positive-stranded RNA, belongs to the Nidovirales order, Coronaviridae family and are classified into three groups. Groups 3a and 3c comprising the avian coronaviruses. They are worldwide in distribution and can cause respiratory, enteric and in some cases hepatitis and neurological diseases in a wide variety of animals, resulting in economic losses to breeders and breeding. In this study, we describe an outbreak of diarrhea in a herd of capybaras found in the city of Piracicaba, São Paulo, Brazil. The animals had sudden symptoms of anorexia, profuse and watery diarrhea, yellowish or greenish, dehydration, weight loss, sharp and twisting of limbs leading to death in less than a week, mostly weaned and with an age of three...
Tipo: Journal article
Palavras-chave: Coronavirus; Capybaras; Transmission electron microscopy.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200035

DETECTION OF INTENSE PLANKTON BLOOMS USING THE MERIS OPTICAL IMAGER ON ENVISAT
Provedor de dados: 72
Autores: Gower,Jim; King,Stephanie; Borstad,Gary; Brown,Leslie.
The European satellite sensor MERIS (Medium Resolution Imaging Spectrometer) can be used to detect a peak in the optical spectrum of water-leaving radiance at about 705 nm which provides a signature of intense plankton blooms. We present examples of this signature in images and spectra derived from MERIS data, and demonstrate how this signature arises using model results. The MERIS band at 709 nm, which is an essential part of the detection scheme, is not present in either Seawifs or MODIS. In many cases the higher spatial resolution (300 m) provided in the FR mode of MERIS data is important for detecting small area events. The combination of wide area coverage, 300m spatial resolution, and appropriate spectral bands makes MERIS a unique and potentially...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200044

DETECTION OF MESOSCALE OCEANIC FEATURES USING RADARSAT-1, AVHRR AND SEAWIFS IMAGES AND THE POSSIBLE LINK WITH JACK MACKEREL (TRACHURUS MURPHYI) DISTRIBUTION IN CENTRAL CHILE
Provedor de dados: 72
Autores: Barbieri,M.A; Silva,C; Larouche,P; Nieto,K; Yáñez,E.
In order to verify the ability of RADARSAT-1 images to detect mesoscale oceanic features and the possible link of these oceanographic patterns with jack mackerel (Trachurus murphyi) distribution in the waters off central Chile, a project was developed as part of the Canada Centre for Remote Sensing Globesar-2 program. The combined use of simultaneously acquired RADARSAT-1, AVHRR sea surface temperature (SST), SeaWiFS Chlorophyll a concentration (Chl), TOPEX/ERS altimeter and ERS-2 scatterometer wind data greatly enhanced SAR imaging capabilities for the detection of oceanic features. Results show that detection of coastal wind-driven upwellings, eddies, frontal boundaries and phytoplankton blooms is possible using SAR imagery, given the proper...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200006

Detection of single nucleotide polymorphisms in the conserved ESTs regions of Gossypium arboreum
Provedor de dados: 69
Autores: Shaheen,Tayyaba; Zafar,Yusuf; Mehboob-ur-Rahman,.
Exploring genetic variation in Gossypium arboreum L. germplasm is useful as it contains many important genes conferring resistance to different stresses. In limited earlier studies, low level of genetic diversity was found by using conventional DNA marker systems which may impede future genome mapping studies. In the present investigation, we explored the extent of Single Nucleotide Polymorphisms (SNP) among 30 conserved regions of Expressed Sequence Tags (EST) of low copy genes between two genotypes of G. arboreum. A total of 27 SNPs including 21 substitutions and 6 Insertions and deletions (Indels) in 7804 bp were found between these genotypes with a frequency of one SNP per 371 bp and one Indel after every 1300 bp. Out of these SNPs, 52% were...
Tipo: Journal article
Palavras-chave: Conserved regions; Gossypium arboretum; SNPs.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500003

DETECTION OF SMALL-SCALE COASTAL OCEANOGRAPHIC PROCESSES THROUGH LANDSAT-TM/ETM+ IMAGES: IMPLICATIONS FOR THE STUDY OF BIOLOGICAL PROCESSES ALONG THE PATAGONIAN COASTS OF ARGENTINA
Provedor de dados: 72
Autores: Gagliardini,Domingo A; Amoroso,Ricardo O; Dell' Arciprete,O. Patricia; Yorio,Pablo; Orensanz,José M.
The Argentine coastal zone, with its highly productive coastal waters, allows the existence of important seabird and marine mammal breeding assemblages, fish and crustacean spawning and nursery areas, and extensive macroalgae and mollusk beds. Knowledge of factors determining the dynamics of coastal waters is urgently needed to help understand their influence on biological processes and marine biodiversity. Available information in the region is currently scarce due to the low number of oceanographic cruises and oceanographic modeling studies. We evaluate the capacity of high-resolution satellite information for the identification and analysis of coastal processes such as fronts, upwellings, and small scale eddies. Using two case studies, we show how the...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200035

Detection of White Spot Syndrome Virus in Brazil using Negative Staining, Immunoelectron Microscopy and Immunocytochemistry Techniques
Provedor de dados: 77
Autores: Hipolito,M; Catroxo,M. H. B; Martins,A. M. C. R. P. F; Melo,N.A; Pituco,E. M; Galleti,N.T.C; Ranzani-Paiva,M. J. T; Mouriño,J.L.P; Ferreira,C.M.
In this study thirty shrimp samples from commercial marine shrimp (L. vannamei) farms of southern region of Brazil were obtained. Hepatopancreas and shell scrapings fragments collected in these animals were processed by transmission electron microscopy using negative staining (rapid preparation), immunoelectron microscopy and immunocytochemistry (immunolabelling with colloidal gold particles) techniques. On the transmission electron microscopy a great number of white spot virus particles, ovoid or bacilliform-to-ellipsoid, measured 230-290 nm in length and 80-160 nm in diameter with intra-nuclear projections were visualized by the negative staining technique in 27 (90%) out of 30 samples examined. Using immunoelectron microscopy technique, the anti-VP 664...
Tipo: Journal article
Palavras-chave: White spot syndrome virus; Negative staining; Immunoelectron microscopy; Immunocytochemistry; Marine shrimp; Litopenaeus vannamei.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200067

Deterioro ambiental y micromamíferos durante el Holoceno en el nordeste de la estepa patagónica (Argentina)
Provedor de dados: 97
Autores: PARDIÑAS,ULYSES F. J.; MOREIRA,GERMAN J.; GARCIA-ESPONDA,CESAR M.; DE SANTIS,LUCIANO M.
Se estudió la composición taxonómica cualitativa y cuantitativa de una muestra de micromamíferos proveniente del paraje Lle cul (43º 20' S, 65º 35' W), en el valle del río Chubut (Argentina), con una antigüedad de 1830 ± 70 años radiocarbónicos AP. La asociación está integrada por roedores sigmodontinos (6 especies), caviomorfos (dos especies), quirópteros (dos especies) y marsupiales marmosinos (dos especies), destacándose por su abundancia Calomys cf. C. laucha-C. musculinus (35,2%) y Eligmodontia sp. (33,4%). El estudio de la frecuencia esqueletaria y marcas de corrosión sobre los restos óseos indican que el agregado ha sido generado por una estrigiforme poco destructiva, quizás Tyto alba, y depositado probablemente en época invernal. La comparación con...
Tipo: Journal article
Palavras-chave: Roedores; Patagonia; Holoceno; Diversidad; Impacto antrópico.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100002

DETERIORO DE LAS SEMILLAS DE Leucocoryne spp. EN FUNCIÓN DEL TIEMPO DE ALMACENAJE
Provedor de dados: 113
Autores: de la Cuadra I.,Carlos; Mansur V.,Leví; Verdugo R.,Gabriela; Arriagada G.,Luis.
El género Leucocoryne es endémico de Chile y tiene un alto valor ornamental que lo hace un recurso genético interesante como flor de corte y planta para maceta. Para conservar este germoplasma se hace necesario evaluar el deterioro de la calidad de la semilla durante el almacenaje. En este estudio se utilizaron semillas almacenadas entre 0,3 y 7,3 años en condiciones ambientales no controladas y se incluyeron tres especies: L. coquimbensis, L. ixioides, L. purpurea y dos ecotipos. Se utilizó un modelo, p = A [1-exp{-&lt;FONT FACE=Symbol&gt;k &lt;/FONT&gt;{t&lt;FONT FACE=Symbol&gt;-&lt;/FONT&gt;t0 }}], cuyos parámetros describen las curvas de germinación. Se evaluó el porcentaje final de germinación (A), el tiempo de germinación de la primera semilla (t0),...
Tipo: Journal article
Palavras-chave: Calidad de semilla; Germinación; Huilli; Glory of the Sun.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100005

Determinación de Especies de Erwinia (grupo carotovora) como Agentes Causales de “Pudrición Blanda” en Cala (Zantedeschia spp.)
Provedor de dados: 113
Autores: Kunstmann,Juan Pablo; Ciampi,Luigi; Böhm,Laura; Barrera,Sylvia; Collado,Luis.
Durante la temporada 2002 se realizó una investigación para establecer los agentes causantes de pudriciones húmedas en tallos y túberos de cala (Zantedeschia spp.) provenientes de producciones bajo invernadero en el Sur de Chile. Para comparar con cepas locales se realizaron aislamientos a partir de tubérculos de papa (Solanum tuberosum L.) obtenidas de una producción comercial cerca de la ciudad de Valdivia. Para analizar las diferencias en virulencia, las cepas de papa fueron inoculadas sobre cala y vice versa. De los aislamientos bacterianos obtenidos se determinaron 33 pertenecientes al género Erwinia (grupo carotovora)(E.c.) de acuerdo a las siguientes características: Gram (-), oxidasa (-) y pudrición de rodajas de papa (+). Pruebas complementarias y...
Tipo: Journal article
Palavras-chave: Erwinia; Pudrición húmeda; Cala.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000300003

Determinación de la Curva de Dilución de Nitrógeno en Diferentes Fases Fenológicas del Girasol
Provedor de dados: 113
Autores: de Caram,Gladis A; Angeloni,Patricia; Prause,Juan.
La concentración de nitrógeno que le permite al cultivo alcanzar la tasa de crecimiento máxima se denomina concentración crítica; estas concentraciones varían de acuerdo a la biomasa aérea considerada, ya que a medida que ésta aumenta se produce un efecto de dilución del nitrógeno en la planta. El objetivo del trabajo fue caracterizar el estado nutricional en nitrógeno foliar de dos híbridos de girasol (Helianthus annuus L.), en distintas fases fenológicas, empleando la curva de dilución del nitrógeno en la materia seca aérea total. Los tratamientos fueron dos híbridos, GUARANI DC y DKSOL 4040, que se sembraron a razón de cuatro surcos por parcela, realizándose tres repeticiones por híbrido. El muestreo se realizó tomando tres plantas por tratamiento para...
Tipo: Journal article
Palavras-chave: Dilución de nitrógeno; Fases fenológicas; Girasol.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000200009

Determinación de la Dominancia Coronaria en Población Mestiza Colombiana: Un Estudio Anatómico Directo
Provedor de dados: 77
Autores: Ballesteros Acuña,Luis Ernesto; Corzo Gómez,Edgar Giovanni; Saldarriaga Tellez,Bladimir.
Los estudios de dominancia coronaria realizados en diversos grupos poblacionales han reportado gran variabilidad. El propósito de este trabajo fue determinar la dominancia coronaria en un grupo de mestizos colombianos. Se evaluaron los corazones obtenidos de 154 cadáveres frescos obtenidos como material de autopsia. Las arterias coronarias fueron sometidas a proceso de inyección con resinas sintéticas e impregnadas en solución de KOH al 15% para liberar la grasa subepicárdica. Se observó dominancia coronaria derecha en el 83,7% de los especímenes cardiacos, correspondiendo la expresión mayoritaria de éstos, a la dominancia moderada con el 42,8%. La circulación balanceada se observó en el 9,2% y la dominancia izquierda en el 7,2%, con una mayor frecuencia...
Tipo: Journal article
Palavras-chave: Corazón; Circulación coronaria; Dominancia; Circulación balanceada; Calibre arterial.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300003

Determinación de la producción de materia seca y extracción de nitrógeno, fósforo, potasio, calcio y magnesio en Liatris callilepis
Provedor de dados: 113
Autores: Hirzel C.,Juan; Ruz J.,Emilio; Schiappacasse,Flavia.
La producción comercial de flores en Chile ha adquirido gran importancia en los últimos años. La tecnología de producción asociada a este rubro aún está en desarrollo. Para conocer la producción de biomasa y acumulación de N, P, K, Ca y Mg durante el ciclo de crecimiento de Liatris callilepis (L.) Willd., se realizó un experimento bajo condiciones productivas, en un suelo andisol correspondiente a la serie Diguillín (Typic Melanoxerands). En este estudio se evaluó la producción y calidad de flores y la extracción de nutrientes en plantas completas incluyendo parte aérea y raíz (cormos), en condiciones de fertilización nula, media y alta. Las evaluaciones de producción se realizaron en los estados fenológicos de plantación (día 0), aparición de tallos (día...
Tipo: Journal article
Palavras-chave: Nutrición mineral; Producción de flores; Fertilidad de suelos.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000200008

Determinación de la susceptibilidad en tres poblaciones de Trialeurodes vaporariorum Westwood (Hemiptera: Aleyrodidae) a metomilo y buprofezin
Provedor de dados: 113
Autores: Vargas M.,Robinson; Alvear de la F.,Andrés.
Se evaluó el nivel de susceptibilidad a metomilo en tres poblaciones de Trialeurodes vaporariorum (Westwood), colectadas de Lycopersicum esculentum Mill. en Quillota, Chile. Se estimaron los tiempos letales medios (TL50) mediante el análisis probit, logrando detectar mínimas pérdidas de susceptibilidad en las poblaciones de campo de 1,1; 1,2 y 1,6 veces más que la población susceptible. Complementariamente, el análisis de varianza (ANDEVA) permitió diferenciar en forma rápida entre una población susceptible y una población con menor susceptibilidad. El ensayo de campo validó la pérdida de susceptibilidad a metomilo y además mostró la eficacia del control con buprofezin. Las fallas de control pueden ser causadas por la pérdida de susceptibilidad a metomilo...
Tipo: Journal article
Palavras-chave: Monitoreo de resistencia; Mosquita blanca de los invernaderos; Insecticidas.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000400003

DETERMINACIÓN DE LOS ÍNDICES DE COSECHA DE DURAZNOS CVS. FLORDAKING Y SAN PEDRO 16-33
Provedor de dados: 113
Autores: Altube,Hector A.; Budde,Claudio O.; Ontivero Urquiza,Mónica G.; Rivata,Raquel S.
El estado de madurez de los frutos a la cosecha representa uno de los factores decisivos en su calidad y en su período de conservación. El objetivo del trabajo fue determinar los índices de cosecha más adecuados para duraznos (Prunus persica L.) de los cultivares Flordaking y San Pedro 16-33. La acidez disminuyó significativamente y no aumentaron los sólidos solubles, lo cual se asocia con pérdidas de sabor. De los índices evaluados los más representativos del grado de madurez fueron el valor a* &lt;FONT FACE=Symbol&gt;&lt;/FONT&gt;[ CIE (1976) L*a*b*]&lt;FONT FACE=Symbol&gt;&lt;/FONT&gt; medido en la zona más verde de la epidermis y la firmeza, esta última con valores de 5,89 kg en Flordaking y 4,98 kg en San Pedro 16-33, para asegurar una maduración...
Tipo: Journal article
Palavras-chave: Maduración; Firmeza.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000200004

Determinación de los Signos y Síntomas de los Trastornos Temporomandibulares, en Estudiantes de 13 a 18 Años de un Colegio de la Comuna de Temuco, Chile
Provedor de dados: 77
Autores: Corsini,Gilda; Fuentes,Ramón; Bustos,Luis; Borie,Evelyn; Navarrete,Andres; Navarrete,Diego; Fulgeri,Bruno.
Los trastornos temporomandibulares (TTM) han sido descritos como "término colectivo que encierra muchos problemas clínicos que comprometen la musculatura masticatoria, articulaciones y estructuras asociadas". Estudios epidemiológicos han reportado que éstos son comunes en niños y adolescentes, con prevalencias de 6% a 68% y, en población adulta el 75% presenta algún tipo de alteración funcional. Los propósitos de este estudio fueron conocer la prevalencia de signos y síntomas de TTM, en un grupo de escolares de Temuco, Chile y determinar tanto el efecto de diseño para un posterior estudio poblacional, como la estabilidad de los tests. Es un estudio de corte transversal, con muestra no probabilística por conveniencia y consentimiento informado, de 116...
Tipo: Journal article
Palavras-chave: Trastornos temporomandibulares; Signos y síntomas; Prevalencia.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000400010

Determinación de Parámetros Estereológicos en el Riñón de Conejo (Oryctolagus cuniculus)
Provedor de dados: 77
Autores: Peña Czischke,Ewert; Romero Méndez,Ingrid; Vásquez,Bélgica; del Sol,Mariano.
El número y volumen glomerular contiene información importante sobre la morfofunción del riñón. El objetivo de este trabajo fue determinar algunos parámetros estereológicos, compararlos con los de otros estudios y determinar patrones de normalidad, para futuros estudios experimentales. Se utilizaron 5 riñones de conejo (Oryctolagus cuniculus), obtenidos del Bioterio de la Universidad de La Frontera, Temuco, Chile. Los riñones fueron disecados y fijados en formalina tamponada al 10%, realizando una breve descripción morfológica de ellos y determinando su volumen por el método de Scherle. Las muestras fueron obtenidas por Orientator e incluidas en Paraplast®. Se utilizó un fragmento de cada riñón y de cada uno de ellos se obtuvieron 5 cortes de 5 µm, los...
Tipo: Journal article
Palavras-chave: Riñón; Estereología; Conejo; Oryctolagus cuniculus.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400006

DETERMINACIÓN DE Phytophthora nicotianae, CAUSANTE DEL CANCRO DEL TALLO DE TOMATE EN CHILE
Provedor de dados: 113
Autores: Bruna V.,Alicia; Tobar C.,Gloria.
El tomate (Lycopersicon esculentum Mill.) es la principal hortaliza cultivada en el país, con 18.000 ha de superficie, concentrándose el 88% de la superficie productiva entre las regiones V y VII. En los últimos cinco años se ha presentado frecuentemente en estas regiones una enfermedad consistente en caída de plántulas en almácigo, lesiones o cancros en los tallos, pudrición y muerte de raíces, frutos con manchas pardas concéntricas y muerte de plantas. Estudios realizados en 32 predios ubicados entre las regiones V y VII demostraron la presencia de aislados patogénicos de Phytophthora nicotianae asociados a estas plantas enfermas. El hongo fue identificado de acuerdo a las características morfológicas, biológicas y a pruebas de patogenicidad en plantas y...
Tipo: Journal article
Palavras-chave: Tomate; Phytophthora nicotianae; Cancro del tallo del tomate; Lycopersicon esculentum.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000300013

Determinación de Proporciones Áureas Cráneofaciales para la Reconstrucción con Fines de Identificación Médicolegal
Provedor de dados: 77
Autores: Suazo Galdames,Iván; Trujillo Hernández,Erick Gonzalo; Cantín López,Mario; Zavando Matamala,Daniela.
La proporción áurea es una relación matemática que se establece entre dos estructuras, representada numéricamente como 1 es a 1,618. Esta proporción se encuentra presente en la naturaleza y en la arquitectura de la región cráneofacial. En el presente estudio se analizaron las relaciones de proporcionalidad entre rectas formadas por la unión de puntos anatómicos reproducibles y otros antropométricos, identificándose aquellas que se relacionaban de manera áurea. Para ello, se identificaron 20 puntos anatómicos reproducibles medianos y paramedianos, en 10 cráneos humanos con características antropológicas homogéneas. Las rectas obtenidas por la unión de los puntos fueron relacionadas matemáticamente, para identificar las que establecían relaciones áureas. Se...
Tipo: Journal article
Palavras-chave: Antropología forense; Identificación humana.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200014

Determinación del Índice Facial Total y Cono Facial en Individuos Chilenos
Provedor de dados: 77
Autores: Bustamante,F; Alves,N; Torres,C; Gatica,C; Olave,E.
El estudio fue realizado en 68 estudiantes, adultos, Chilenos, de ambos sexos, con edades entre 17 y 32 años, oriundos de la Regiónde la Araucanía, Chile. En cada uno se registraron el diámetro vertical (Nasion-Gnation, Na-Gn) y diámetros transversales (bigoníaco y bicigomático, Go-Go y Cig-Cig, respectivamente) y se calculó el índice facial total (IFT). Para la obtención del cono facial se compararon los anchos Go-Go y Cig-Cig. Se analizó la relación entre: IFT v/s cono facial; IFT v/s sexo; cono facial v/s sexo. Para el análisis estadístico se utilizó las pruebas de chi-cuadrado, Pearson y coeficiente de correlación de Spearman, considerándose significativo p&lt;0,05. La altura de la cara (Na-Gn) fue de 117,5 mm en hombres y de 110,3 mm en mujeres; el...
Tipo: Journal article
Palavras-chave: Antropometría; Índice facial total; Individuos chilenos.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300025

Determinación del Porcentaje de Masa Grasa, según Mediciones de Perímetros Corporales, Peso y Talla: Un Estudio de Validación
Provedor de dados: 77
Autores: Díaz,J; Espinoza-Navarro,O.
La obesidad se caracteriza por un aumento excesivo de la grasa corporal. En Chile, en el año 2010, se determinó que el 25,1% de la población sobre los 15 años, presentaba obesidad y un 39,3 % sobrepeso. El objetivo de esta investigación fue validar un método económico y de fácil manejo para los profesionales de la Educación, que permita determinar los porcentajes de masa grasa (%MG) en población escolar, ocupando las variables de perímetros corporales, el peso y la talla (PPT). A una muestra de 1725 alumnos de enseñanza básica, 1020 niñas y 705 niños, de entre 10 a 14 años de edad de la Comuna de Arica (XV Región), se les determinó el %MG según el modelo propuesto de perímetro, peso y talla (PPT). Como modelos de referencia se utilizaron los protocolos de...
Tipo: Journal article
Palavras-chave: Perímetros corporales; Chile; Enseñanza Básica.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400054

DETERMINACION PRELIMINAR DE SUBCASTAS EN OBRERAS DE ACROMYRMEX LOBICORNIS EMERY 1887 (HYMENOPTERA: FORMICIDAE)
Provedor de dados: 72
Autores: Quirán,Estela M; Corró Molas,Bárbara M; Caramuti,Valeria E; Bernardos,Jaime.
En la estructura social de formícidos se distingue una casta de individuos sexuados encargada de la reproducción y una casta de individuos estériles u obreras encargada del resto de las tareas de la sociedad, tales como cuidado de la prole, construcción del nido y defensa. Dentro de la casta obrera puede existir división de labores, reconociéndose en algunas especies subcastas polimórficas o poliéticas. El objetivo del presente trabajo fue determinar si las variaciones morfológicas entre las obreras de Acromyrmex lobicornis Emery 1887 permiten separar a la casta obrera en subcastas, y si esta variación está relacionada con alguna/s tarea/s en particular. Se colectaron obreras en tres sitios del nido: túmulo, honguera y camino y en laboratorio se tomaron...
Tipo: Journal article
Palavras-chave: Attini; Hormigas cortadoras; Casta obrera; División de labores.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000100004

Determination of Anterior Pelvic Index (API) to Predict a Narrow Pelvis in Adolescent Girls
Provedor de dados: 77
Autores: Guerrero,Marco; Ocampo,Juan; Zapata,Marcia; Yépez,Eduardo.
Cephalopelvic disproportion in the pelvic inlet is a maternal risk factor in childbirth. A high number of dystocias are attended as emergencies and end in cesarean sections because there is no way to diagnose a narrow pelvis early on, a determination which would be easy to perform and at no cost to the patient. The aim of this study was to determine the Anterior Pelvic Index (API) as a predictive estimator of the obstetric conjugate diameter to differentiate narrow and normal pelvises. The study was conducted with 200 adolescent girls aged 14 to 19 years, from Quito, Ecuador; the parents signed the informed consent and the girls agreed to take part. The interspinous distance, height and obstetric conjugate diameter were measured by ultrasonography. Then...
Tipo: Journal article
Palavras-chave: Pelvis; Pelvimetry; Narrow pelvis; Obstetric conjugate diameter.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300056

Determination of Antioxidant Capacity, Total Phenolic Content and Mineral Composition of Different Fruit Tissue of Five Apple Cultivars Grown in Chile
Provedor de dados: 117
Autores: Henríquez,Carolina; Almonacid,Sergio; Chiffelle,Italo; Valenzuela,Tania; Araya,Manuel; Cabezas,Lorena; Simpson,Ricardo; Speisky,Hernán.
Apples (Malus domestica Borkh.) have been identified as one of the main dietary sources of antioxidants, mainly phenolic compounds. These compounds vary in their composition and concentration, among cultivars and fruit tissues. In this research, the total phenolic content (Folin-Ciocalteau assay), antioxidant capacity (Ferric Reducing Antioxidant Power, FRAP assay) and mineral composition in three fruit tissues (peel, pulp and whole fruit), of apple cultivars commonly used for dried apple production in Chile, were studied. In addition, the physical-chemical characteristics (dry weight, pH, titratable acidity, soluble solids content and color) were also evaluated. The results indicated that the total phenolic content, the antioxidant capacity, and the...
Tipo: Journal article
Palavras-chave: Folin-Ciocalteau assay; FRAP antioxidant capacity; Physical-chemical parameters.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000400001

Determination of fructan exohydrolase activity in the crude extracts of plants
Provedor de dados: 69
Autores: Krivorotova,Tatjana; Sereikaite,Jolanta.
Background The roots of chicory and the tubers of Jerusalem artichoke are used for the production of inulin. However, a quality of tubers and roots, i.e. the content of inulin, monosaccarides and disaccharides, depends on the activity of enzymes implicated in the metabolism of inulin. The knowledge on the changes of activities of inulin synthesizing and degrading enzymes is limited during plant sprouting, growth and dormancy. It happens due to complicated measurements of the product of enzymatic reaction in the presence of crude plant extract. Fructan exohydrolase (&amp;#946;-d-fructan fructohydrolase, FEH, EC 3.2.1.80) is an enzyme responsible for the hydrolysis of fructans in plants. For fructose as the reaction product measurement, a high-performance...
Tipo: Journal article
Palavras-chave: 3; 5-Dinitrosalicylic acid Copper(II)-neocuproine Enzymatic method Fructose determination.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600012

Determination of harvest maturity of D'Agen plums using the chlorophyll absorbance index
Provedor de dados: 118
Autores: Infante,Rodrigo; Rubio,Pía; Contador,Loreto; Noferini,Massimo; Costa,Guglielmo.
The objective determination of the optimal harvest date for plums intended either for industrial processing or for consumption as fresh fruit is a fundamental concern of the fruit industry. A portable visible/near infrared (Vis/NIR) spectroscopic device was used to sort D'Agen plums harvested around the traditional commercial harvest date. The chlorophyll absorbance index was found to be capable of segregating plums into classes of maturity according to various concentrations of soluble solids and fruit compression strenght values. Fruits with a chlorophyll absorbance index value of less than 1.59 showed no differences in flesh firmness. Plums harvested with chlorophyll absorbance index values of 1.20-1.29 had a fruit compression strenght of 1.25 N and a...
Tipo: Journal article
Palavras-chave: European plum; Harvest; Maturity; Vis/NIR.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000200004

Determination of homogeneous edaphoclimatic zones for the secondary forests of Nothofagus dombeyi in central-southern Chile
Provedor de dados: 118
Autores: Esse,Carlos; Donoso,Pablo J; Gerding,Víctor; Encina-Montoya,Francisco.
C. Esse, PJ. Donoso, V. Gerding, and F. Encina-Montoya. 2013. Determination of homogeneous edaphoclimatic zones for the secondary forests of Nothofagus dombeyi in central-southern Chile. Cien. Inv. Agr. 40(2): 351-360. Nothofagus dombeyi grows in a wide variety of sites in Chile (30-47°S), but there is little knowledge about its productive potential. This lack of information hinders decision-making to better guide the production of goods and services from these forests. This study was conducted in central-southern Chile (39°S-41°S), where this species is prominent, especially in secondary forests. The aim of the study was to determine the homogeneous edaphoclimatic zones for secondary forests of N. dombeyi based on the integration of environmental factors....
Tipo: Journal article
Palavras-chave: CART; Biophysical factors; Edaphoclimatic zones; K-means.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200010

Determination of Lateral Ventricle and Brain Volume in Children with Stereological Method Using MRI
Provedor de dados: 77
Autores: Karacan,Keziban; Kosar,Mehmet Ilkay; Çimen,Mehmet; Solak,Orhan; Sahin,Bünyamin.
Although brain development is most active during the intrauterina period of life, the processes of myelination and arborization affect the structure of the brain throughout childhood and adolescence. Brain development is also very active in the early years of a child's life, and continues to be so for approximately 15 years after gestation. Volumetric changes in the brain are effected by sex. Understanding the variability of human brain volume during development is important for the interpretation of childhood neuroimaging studies. Hence the aim of this study is to determine the effects of sex difference on brain volume (BV), lateral ventricle volume (LV) and the ratio of brain volume and lateral ventricle volumes as a percentage (RLBV%) of 90 healthy...
Tipo: Journal article
Palavras-chave: Brain; Lateral ventricles; Magnetic resonance imaging; Stereology.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100035

Determination of minimal age of five species of Chusquea bamboos through rhizome analysis as a tool to predict the flowering in southern Chile
Provedor de dados: 97
Autores: TAGLE,LEONARDO; MURÚA,ROBERTO; BRIONES,MIREYA; MONTALBA,RENE; LAMBIN,XAVIER.
Synchronous flowering and subsequent drying up of bamboos of the genus Chusquea are important processes in the dynamics and structure of many forest ecosystems. In southern South America, bamboo flowering and subsequent mast seeding trigger rodent outbreaks associated with zoonotic diseases. Predicting future flowering events requires knowledge of the age of bamboo stands together with species-specific periodicity in flowering. We explored whether it is possible to predict the minimum age in bamboo plants based on the features of their rhizomes. We studied bamboo stands of age known by the local people in 15 sites in the coastal and Andes Mountains as well as in and the Central Valley of southern Chile (37° 48'- 43° 58' S, from 12 to 1047 m.a.s.l.). For...
Tipo: Journal article
Palavras-chave: Age determination; Bamboo; Chusquea spp; Hanta; Seed masting; Rhizome.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400004

DETERMINATION OF PHYTOPLANKTON CONCENTRATIONS FROM SPACE-BORNE SPECTROSCOPIC MEASUREMENTS
Provedor de dados: 72
Autores: Sierk,B.; Bracher,A.; Richter,A.; Vountas,M.; Dinter,T.; Burrows,J.P.
Since its launch into orbit on board of the ENVISAT spacecraft on March 1st, 2002, the Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) continuously measures transmitted, reflected and scattered solar radiation from 220 - 2380 nm at moderate spectral resolution (0,2 nm - 1,5 nm). Global maps of atmospheric trace gas distributions are derived from these measurements using the Differential Optical Absorption Spectroscopy (DOAS) technique. Although SCIAMACHY is primarily an atmospheric mission, part of the detected solar radiation penetrates the ocean surface and picks up an absorption signal from molecular species in sea water. In the visible part of the measured spectra, spectral features of chlorophyll can clearly be...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300039

Determination of Quality Chemical Parameters of Honey from Chubut (Argentinean Patagonia)
Provedor de dados: 117
Autores: Aloisi,Pia Valeria.
This study was intended to evaluate the quality chemical parameters of 62 Apis mellifera L. honey samples, from the Province of Chubut, Argentine. Samples were obtained from the three melliferous areas of this province: Andean region, lower Chubut River valley and plains of Senguerr River. The average values obtained for electrical conductivity (0.33 mS cm-1) and pH (4.17) indicate that the analyzed honeys came mainly from nectar. Electrical conductivity was higher in honeys from the Andean region than in honeys from the other two regions. Moisture (water content) was low, with an average value of 14.67%. The hydroxymethylfurfural (HMF) content was very low and ranged between 0.0 and 14.70 mg kg-1. Moisture, HMF and free acidity values show good maturity...
Tipo: Journal article
Palavras-chave: Honey characterization; Argentinean honeys; Patagonian honeys; Quality parameters.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000400015

Determination of spatiotemporal stability of corn head smut(Sporisorium reilianum) by SADIE
Provedor de dados: 118
Autores: Ramírez-Dávila,José F; Sánchez-Pale,Jesús R; Porcayo-Camargo,Elvia; de León,Carlos.
Recently, S. reilianum has caused significant ecological and economic damage in the maize-producing areas of Mexico and other countries. Knowledge about the spatiotemporal stability and distribution of the disease is important for the development of integrated management programs. The present study was performed to model the spatial distribution of S. reilianum from 2006 to 2009 using geostatistic techniques and to determine the spatiotemporal stability of corn head smut via a spatial analysis by distance indices (SADIE) and the Cramer-von Mises test. The incidence of the disease was determined in 100 corn parcels located in Santa Magdalena Valle de Bravo Municipality, and the parcel locations were determined with dGPS. The spatial distribution analysis...
Tipo: Journal article
Palavras-chave: Geostatistics; SADIE; Spatial distribution; Spatiotemporal stability; Sphacelotheca; Zea mays.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300006

Determination of suitable zones for apitourism using multi-criteria evaluation in geographic information systems: a case study in the O'Higgins Region, Chile
Provedor de dados: 118
Autores: Pantoja,Gabriel; Gómez,Miguel; Contreras,Claudio; Grimau,Lissette; Montenegro,Gloria.
Abstract Beekeeping, which involves honey production and pollination of agricultural crops, has become a significant production activity. Linking beekeeping with ecotourism brings greater value to the beekeeping sector, thereby attracting the development of apitourism. Multi-criteria decision analysis is a set of techniques developed through Geographic Information Systems (GIS) focused on spatial decision making, which can be used to link beekeeping and tourism for the development of priority sites for shared activity. This work is based on the definition and weighting of factors used for evaluation of apitourism suitability in Chile, considering the opinion of beekeepers and professionals associated with the sector. The result is a map of apitouristic...
Tipo: Journal article
Palavras-chave: Beekeeping; Geographic information systems (GIS); Land-use suitability analysis; Melliferous plant; Multi-criteria decision analysis (MCDA); Tourism.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000200139

Determination of the Species from Skeletal Remains Through Histomorphometric Evaluation and Discriminant Analysis
Provedor de dados: 77
Autores: Morales,Juan-Pablo; Roa H,Ignacio; Zavando,Daniela; Suazo Galdames,Iván.
In situations where the skeletal remains found are too fragmented, it is necessary to assess the human origin of such remains; for this purpose, various parameters are used, both anatomical and histological. The objective of the present study is to evaluate the various histomorphometric parameters to differentiate human from non-human bones, to further construct discriminatory functions that allow interspecies classification. Tibia bones sections from human, bovine, pig, hen, cat, and dog species were used, processed through conventional histological techniques and observed under the microscope with a 40x magnification, analyzing the Haversian Canal Density parameters by mm2, Diameter of the Haversian Canal and the Diameter of the Haversian System which...
Tipo: Journal article
Palavras-chave: Bone; Forensic analysis; Determination of species; Osteon compact bone; Haversian canal.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300044

Determining response times for the deployment of terrestrial resources for fighting forest fires: A case study: Mediterranean - Chile
Provedor de dados: 118
Autores: Castillo,Miguel E; Rodriguez y Silva,Francisco.
A study of response times for the arrival of terrestrial forest fire fighting resources was undertaken. The advantage of the method proposed here is that it may be exactly replicated in different countries and under different environmental conditions, budgets and infrastructures for wildfire combat. This is an international-level support offering better reference material for optimizing terrestrial resources. In the combat of forest fires, fire fighting resource response times are of particular importance when evaluating fire advance speed and fire damage potential against time. Due to the importance of speed in fire containment and the economic consequences of a fire, a fire combat response time curve was constructed using fire fighting operation data...
Tipo: Journal article
Palavras-chave: Extinction times; Forest fire; Fire combat; Fire behavior.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000100010

Determining the site index of Teak (Tectona grandis L.) plantations in Tabasco, Mexico
Provedor de dados: 118
Autores: Minoche,Djhon; Herrero,Celia; Dominguez-Dominguez,Marivel; Martinez-Zurimendi,Pablo.
Abstract Forest stand productivity is defined as the quantitative estimation of a specific area's potential to produce biomass over a determined period of time. The site index has been the predominant method used to evaluate forest stand productivity. Teak is one of the most accepted species within the international timber market due to the physical and aesthetic qualities of this wood. The aim of this study was to determine the site index of teak plantations. The study was conducted in teak plantations of Tabasco. Data were obtained from a network of 10 plantations consisting of 35 plots measured over four successive inventories (2003 to 2006). The data were fitted to five models, of which four were based on proposed finite difference equations and a...
Tipo: Journal article
Palavras-chave: Finite difference equations; Forest productivity; Inventory; Non-integrated function; Validation.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000200154

Development and application of high-throughput amplified fragment length polymorphism technique in Calluna vulgaris (Ericaceae)
Provedor de dados: 69
Autores: Borchert,Thomas; Gawenda,Inka.
Calluna vulgaris is an important ornamental crop of the horticultural industry in Europe. In order to improve breeding of this species, especially of the most important trait of &amp;#8216;bud-flowering', the implementation of molecular techniques that allow rapid, reproducible and efficient screening of whole segregating populations e.g. for molecular marker and mapping approaches is a requirement. We therefore aimed to introduce the powerful tool of amplified fragment length polymorphisms (AFLP®), a widely and successfully applied method, into our methodological assortment. As an essential prerequisite, the isolated DNA should be of adequate quality which is a common obstacle when dealing with woody species and their interfering secondary...
Tipo: Journal article
Palavras-chave: DNA content; Mapping; Marker-assisted selection; Ornamental; Plant tissue.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000200007

Development and application of qRT-PCR for sugar beet gene expression analysis in response to in vitro induced water deficit
Provedor de dados: 69
Autores: Taski-Ajdukovic,Ksenija; Nagl,Nevena; Kovacev,Lazar; Curcic,Zivko; Danojevic,Dario.
Sugar beet is a significant industrial crop, often grown in the areas where summer drought can severely limit root yield and sugar content. In order to improve development of sugar beet cultivars with increased drought tolerance it is necessary to understand plant response to water stress at the genomic level. Since recent research efforts have focused on the molecular response of the plant in order to identify water deficit inducible genes, the aim of this investigation was to develop qRT-PCR methodology for the quantification of gene expression in sugar beet under conditions of water deficiency in vitro. Sugar beet genotypes, selected for different response to water deficit, were grown and multiplied in vitro. Axilary shoots were placed on...
Tipo: Journal article
Palavras-chave: Beta vulgaris; Drought; In vitro; Real-time PCR.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600010

Development and characterization of two new cell lines from common carp, Cyprinus carpio (Linn)
Provedor de dados: 48
Autores: Lakra,Wazir S; Goswami,M; Rajaswaminathan,T; Rathore,Gaurav.
Two new cell lines (CCF and CCH) were established from fin and heart tissues of common carp, Cyprinus carpio. The cells were optimally maintained in Leibovitz-15 medium supplemented with 10% fetal bovine serum (FBS) and 10 ng/ml of basic fibroblastic growth factor (bFGF). The effects of temperature, concentration of FBS and bFGF on the growth of CCF and CCH cells were examined. The temperature ranged from 24 to 32 °C for good growth of the cells. The growth rate of cells was higher in medium containing 10% FBS and the addition of bFGF to the medium significantly increased the growth rate. The CCF cells were found to be epithelial, while the CCH cells were fibroblastic in nature. The cytogenetic analysis of the cell lines revealed a diploid number of 100...
Tipo: Journal article
Palavras-chave: Cyprinus carpio; Cell line; MtDNA.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000400002

Development and significance of RAPD-SCAR markers for the identification of Litchi chinensis Sonn: by improved RAPD amplification and molecular cloning
Provedor de dados: 69
Autores: Cheng,Jingliang; Long,Yan; Khan,Asaduzzaman; Wei,Chunli; Fu,Shelly; Fu,Junjiang.
Background Analysis of genetic diversity is important for the authentication of a species. Litchi (Litchi chinensis Sonn.) is a subtropical evergreen tree. Recently, L. chinensis has been characterized by an improved random amplified polymorphic DNA (RAPD) and inter-simple sequence repeat (ISSR) analysis. The goal of this study was to develop sequence-characterized amplified region (SCAR) markers from the improved RAPD fragments for the genetic analysis of L. chinensis. Results The improved RAPD fragments from L. chinensis were cloned, sequenced and converted into stable SCAR markers. Sequencing of three cloned RAPD fragments revealed that the clone L7-16 consisted of 222 nucleotides (GenBank accession number KM235222), clone L9-6 consisted of 648...
Tipo: Journal article
Palavras-chave: Genetic authentication; Molecular cloning; Random amplified polymorphic DNA; Sequence-characterized amplified region marker.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100007

Development, characterization and use of genomic SSR markers for assessment of genetic diversity in some Saudi date palm (Phoenix dactylifera L.) cultivars
Provedor de dados: 69
Autores: Al-Faifi,Sulieman A; Migdadi,Hussein M; Algamdi,Salem S; Altaf Khan,Mohammad; Ammar,Megahed H; Al-Obeed,Rashid S; I. Al-Thamra,Mohammad; EL-Harty,Ehab H; Jakse,Jerenj.
Background: The present study was undertaken towards the development of SSR markers and assessing genetic relationships among 32 date palm (Phoenix dactylifera L.) representing common cultivars grown in different geographical regions in Saudi Arabia. Results: Ninety-three novel simple sequence repeat markers were developed and screened for their ability to detect polymorphism in date palm. Around 71% of genomic SSRs were dinucleotide, 25% tri, 3% tetra and 1% penta nucleotide motives. Twenty-two primers generated a total of 91 alleles with a mean of 4.14 alleles per locus and 100% polymorphism percentage. A 0.595 average polymorphic information content and 0.662 primer discrimination power values were recorded. The expected and observed heterozygosities...
Tipo: Journal article
Palavras-chave: Expected and observed heterozygosity; Microsatellite markers; Polymorphic information content; Polymorphism; Primer discrimination power.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300002

Development of a BALB/c mouse model of Helicobacter pylori infection with fresh and frozen bacteria
Provedor de dados: 48
Autores: Rabelo-Gonçalves,Elizabeth M A; Nishimura,Nancy F; Murilo R Zeitune,José.
An experimental model for H. pylori infection was established by intragastrically challenging BALB/c mice with 1 ml (10(8) CFU/ml) of suspension for two consecutive days. Animals were divided into three groups. GA: mice inoculated with fresh bacteria; GB: mice inoculated with frozen bacteria, and GC: mice inoculated with brucella broth (control group). Animals were killed at 7, 14, 21, 28, 35 and 60 days pi and fragments of stomach and duodenum were collected, paraffin embedded and stained by hematoxylin-eosin and Giemsa. The results showed that challenged mice exhibited mild duodenitis and gastritis. In group GA, infiltration in the duodenum was lymphoplasmacytic until day 35; in group GB, it was lymphomonocytic for 60 days pi. In the stomach, H. pylori...
Tipo: Journal article
Palavras-chave: BALB/c mouse; Experimental model; Helicobacter pylori.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000100012

Development of a caspase-3 antibody as a tool for detecting apoptosis in cells from rainbow trout (Oncorhynchus mykiss)
Provedor de dados: 69
Autores: Rojas,Verónica; Guzmán,Fanny; Valenzuela,Cristián; Marshall,Sergio H; Mercado,Luis.
Background: Apoptosis is an active cell death process mediated by caspases activation, in which different extrinsic or intrinsic signalling pathways result in direct activation of effector caspases. Caspase-3 is considered to be the most important of the executioner caspases, which cause the morphological and biochemical changes detected in apoptotic cells. Different bacterial and virus pathogens have developed different strategies to survive inside the host and overcome natural protections, one of them is inducing apoptotic death in infected cells. We have demonstrated previously that Piscirickettsia salmonis activates this process in monocytes/macrophages from salmonid RTS11 cell line both by morphological and caspase detection assays; nevertheless,...
Tipo: Journal article
Palavras-chave: Antibody; Caspase-3; Fish apoptosis; Piscirickettsia salmonis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500012

DEVELOPMENT OF A MOLECULAR MARKER FOR RUST RESISTANCE GENES Sr39 AND Lr35 IN WHEAT BREEDING LINES
Provedor de dados: 69
Polymorphic DNA bands were identified between a near iso-isogenic line of wheat carrying both stem (Sr39) and leaf (Lr35) rust resistance genes and the recurrent line Thatcher (Tc) which lacks these genes. Both resistance genes are located on a translocated chromosomal segment derived from Aegilops speltoides and thus are genetically linked. The primers used to generate polymorphic bands were 3'-anchored inter-simple sequence repeat primers which identified genomic microsatellites with a repeated motif of 3 nucleotides in length. The primers were used singly to amplify genomic segments which were flanked by inversely orientated, closely spaced, identical microsatellite sequences. One of the polymorphic bands, a 900 base pair band, was completely linked to...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000100004

Development of a novel method to evaluate sialylation of glycoproteins and analysis of gp96 sialylation in Hela, SW1990 and A549 cell lines
Provedor de dados: 48
Autores: Liang,Yangui; Hua,Qiang; Pan,Pengwei; Yang,Jie; Zhang,Qi.
BACKGROUND: Glycoproteins play a critical role in the cellular activities of eukaryotes. Sialic acid is typically the outermost monosaccharide of glycolipids and glycoproteins, and is necessary for normal development. RESULTS: A strategy based on avidin-biotin affinity was established to enrich sialylated glycoproteins from HeLa cervical carcinoma, SW1990 pancreatic adenocarcinoma, and A549 lung adenocarcinoma cells. Using HPLC-MS/MS, western blot, real-time PCR, and enzyme-linked immunosorbent assay, gp96 was identified in all three cell lines. No significant difference in the protein expression of gp96 was detected at the whole cell level, but the amount of bioti-nylated gp96 in SW1990 cells was 30-40 % lower than that in A549 and HeLa cells, and the...
Tipo: Journal article
Palavras-chave: Click chemistry; Sialic acid; Gp96; Sialyltransferase.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100052

DEVELOPMENT OF ARBUSCULAR MYCORRHIZAL FUNGI IN THE PRESENCE OF DIFFERENT PATTERNS OF Trifolium repens SHOOT FLAVONOIDS
Provedor de dados: 127
Autores: Scervino,José Martín; Ponce,María Alejandra; Delia Monica,Ivana; Vierheilig,Horst; Ocampo,Juan Antonio; Godeas,Alicia.
We tested the effects of the flavonoid 3-methoxi-5,6,7,8-hydroxy-4'hydroxy flavone (NMHTV) isolated from shoots of non arbuscular mycorrhizal (AM) inoculated clover, and of the flavonoids 5,6,7,8-hydroxy-3-methoxy flavone (MH-1); 5,6,7,8-hydroxy-4'-hydroxy flavone (MH-2); and 5,7-hydroxy-3,4'-methoxy flavone (MH-3); isolated from AM clover {Trifolium repens) shoots, on spore germination, hyphal length, hyphal branches and the number of cluster of auxiliary cells or the number of secondary spores (Presymbiotic stage) and on the number of entry points and the percentage of AM colonized root of tomato (Lycopersicum esculentum) by the AM fungi Gigaspora rosea, Giaspora margarita, Glomus mosseae and Glomus intraradices (Symbiotic stage). Non significant effects...
Tipo: Journal article
Palavras-chave: Arbuscular mycorrhizas; Flavonoids; Signal molecules; Symbiosis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000200002

Development of behavioral studies in Chile between 1984 and 1998
Provedor de dados: 97
Autores: LABRA,ANTONIETA; RAMIREZ,CLAUDIO C.; NIEMEYER,HERMANN M.
The development and the current state of behavioral studies in Chile was analyzed considering articles on Chilean fauna published between 1984 and 1998 (203 articles). The number of articles on the subject of animal behavior has increased significantly along the period studied, indicating an increasing interest on this research. However, the international impact of Chilean research has been comparatively low. Proposals to stimulate the development of this research area in Chile are: i) that main research universities in Chile recruit well-trained behavioral ecologists. This will have immediate impact by increasing the number of courses in animal behavior, which will attract a new generation of biology students into this area, promoting the persistence and...
Tipo: Journal article
Palavras-chave: Animal behavior studies; Chilean fauna.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300001

Development of Biotechnology in South Africa
Provedor de dados: 69
Autores: Burton,Stephanie G.; Cowan,Don A.
Biotechnology in South Africa stands at a cross-roads. As a country with huge natural resources, equally huge social problems, and in a state of positive transition to full multi-cultural development, SA faces the complex task of effectively exploiting its science, technology and resource base for the benefit of its society. The potential of Biotechnology for social and economic development has only recently been a focal point. There are signs, at all levels from central administration to individual tertiary institutions, that the first decade of the 21st century may be the point where Biotechnology ‘comes of age’ in South Africa.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100004

Development of cDNA-derived SSR markers and their efficiency in diversity assessment of Cymbidium accessions
Provedor de dados: 69
Autores: Moe,Kyaw Thu; Hong,Woo-Ju; Kwon,Soon-Wook; Park,Yong-Jin.
Cymbidium spp. are popular &amp;#64258;owering plants. Assessment of the genetic diversity in cultivated Cymbidium facilitates conservation of germplasm and subsequent cultivar improvement. Thus, it is important to develop more efficient polymorphic DNA markers. Although more motifs (403) were identified and more primers (206) were designed in the genomic library compared to the cDNA library, a larger number of successful primers were obtained from the cDNA library (59.9%) than from genomic DNA library (51.1%). However, higher PIC and gene diversity were identified in genomic SSRs. The average allele number per locus was also higher in genomic SSRs (7.3) than EST-SSRs (5.2), among the 24 evaluated Cymbidium accessions. AT/TA was comparatively high in...
Tipo: Journal article
Palavras-chave: CDNA library; Cymbidium; Enriched library; Molecular diversity; SSR.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200004

Development of insulin resistance in horses (Equus caballus): etiologic and molecular aspects
Provedor de dados: 118
Autores: Gandarillas,Monica; Matus,José Tomás; Márquez-Hernández,Roberto I; Vargas-Bello-Pérez,Einar.
In horses, insulin resistance is associated with several comorbidities such as obesity, laminitis, colic and osteochondrosis. The multifactorial causes of insulin resistance in horses have been addressed, which include genetic and environmental factors. As a consequence of these factors, the cellular signaling pathways responsible for insulin synthesis, the glucose intake in target cells of peripheral tissues and other related processes (e.g., adipocytokine signaling pathways) are affected. In response to insulin, changes in gene expression occur, which are required for the integration of an entire network of metabolic and physiological responses in different organs. The peroxisome proliferator-activated receptors (PPARs) were the particular focus of...
Tipo: Journal article
Palavras-chave: Equine nutrition; Insulin resistance; PPAR-gamma.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000200001

Development of pollen mediated activation tagging system for Phalaenopsis and Doritaenopsis
Provedor de dados: 69
Autores: Tsay,Hsin-Sheng; Ho,Hui-Min; Gupta,Sushim K; Wang,Chang-Sheng; Chen,Pei-Tsu; Chen,Emily Chin-Fun.
In the present study, a novel plant transformation system for Doritaenopsis and Phalaenopsis has been developed. The pollen-mediated activation tagging system was established by artificial pollination. The pollens, co-cultured with Agrobacterium tumefaciens strain EHA105 harbouring an activation tagging vector (pTAG-8), were used for pollination. In order to optimize the transformation efficiency, several factors (concentration of A. tumefaciens, concentration of acetosyringone during co-cultivation and the duration of co-cultivation) known to influence Agrobacterium-mediated DNA transfer were examined. A concentration of 0.5-1 x 10(8) CFU/ml for A. tumefaciens, 0.1 mM acetosyringone, and 6 hrs of co-culture period were found to be the optimal condition...
Tipo: Journal article
Palavras-chave: Activation tagging; Agrobacterium tumefaciens; Doritaenopsis cultivars; Phalaenopsis amabilis; Transformation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400009

Development of potency assays for a plasmid containing vascular endothelial growth factor 2
Provedor de dados: 69
Autores: Huang,Li-chun; Chin,Emily; Chiang,Yawen L.
We have developed analytical methods to measure the biological functions of pVGI.1(VEGF2), a naked plasmid DNA product containing vascular endothelial growth factor 2 used in clinical trials for coronary artery diseases (CAD) and peripheral artery diseases (PAD). After being injected into muscles, vascular endothelial growth factor 2 (VEGF-2), presumably expressed in muscle tissues, binds to the endothelial cell receptors VEGFR2 or VEGFR3, triggering the downstream responses including cell proliferation and vascularization. As it is important to make sure clinical material is biological active, we developed a quantitative assay first to measure the receptor binding activity of the pVGI.1(VEGF2) gene product expressed by the transfected host cells, and then...
Tipo: Journal article
Palavras-chave: Cell proliferation; Plasmid DNA; Potency assays; Receptor binding; VEGF-2.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100001

Development of quantitative competitive PCR for determination of copy number and expression level of the synthetic glyphosate oxidoreductase gene in transgenic canola plants
Provedor de dados: 69
Autores: Hadi,Faranak; Salmanian,Ali Hatef; Ghazizadeh,Elham; Amani,Jafar; Noghabi,Kambiz Akbari; Mousavi,Amir.
Background: For successful in vitro plant regeneration, plant cell lines with multiple transgene integration and low transgene expression levels need to be ruled out. Although real-time polymerase chain reaction (RT-PCR) is a rapid way to accomplish this, it is also expensive and typically limits the size of the target sequence. Quantitative competitive PCR (QC-PCR) is proven to be a safe and accurate method for determination of both copy number and quantification of transcript levels of synthetic transgenes in transformed plants. Results: The glyphosate oxidoreductase genewas chemically synthesized and used to transform Brassica napus L. via Agrobactrium-mediated transformation. A construct containing the mutated form of a synthetic glyphosate...
Tipo: Journal article
Palavras-chave: Brassica napus L.; Competitive quantitative PCR; Transcript level; Transgene copy number.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400002

Development of the Morphostructure and Meat Value in Chilota Lambs
Provedor de dados: 77
Autores: de la Barra,R; Martínez,M. E; Calderón,C; Morales,R; de la Fuente,L. F.
Chilota sheep are typical of the Chiloé archipelago in southern Chile. The objectives of this study were: 1) To describe the development of the morphostructure of Chilota lambs in their first months of life using some variables that determine lamb meat value (zoometric traits and body weight) and 2) To determine the optimum slaughter age. Measurements were taken from 12 male single-born lambs. Body weight, Withers height; Perimeter of thorax, Chest depth, Shoulder point width and Body length were measured in each animal. The first measurements were taken at 7 days old, and the rest at 37, 67, 97, 127, 157 and 187 days old. The body weight variables and zoometric traits developed allometrically throughout the growth phase. The correlation coefficient...
Tipo: Journal article
Palavras-chave: Sheep; Postnatal development; Morphology; Body weight.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400044

Development of the Vertebral Column and Caudal Skeleton in Prochilodus lineatus Larvae under Laboratory Conditions
Provedor de dados: 77
Autores: Hernández,David Roque; Olivera,Carlos; Santinón,Juan José; Ruiz Diaz,Federico José; Sánchez,Sebastián.
For successful fish larviculture thorough studies describing the development of fish in different morphological aspects are required, as they are crucial for larval survival and growth. The present study described in Prochilodus lineatus larvae the osteological development of the vertebral column and caudal skeleton 30 days after hatching (dah). Larvae were obtained by artificial induction of adults. The beginning of formation of the spine occurs between 10 to 12 dah (8.3 mm standard length, SL) simultaneously to the first neural and hemal processes and the pre-caudal vertebral bodies. The ossification of the vertebral column occurred in cranio-caudal direction and was completed at 28 dah (22.6 mm SL). The development of the caudal skeleton elements...
Tipo: Journal article
Palavras-chave: Prochilodus lineatus; Larviculture; Osteological development.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100021

Development of transformation vectors for the production of potentially high oleate transgenic oil palm
Provedor de dados: 69
Autores: Masani,Mat Yunus Abdul; Parveez,Ghulam Kadir Ahmad.
The main target of Malaysian Palm Oil Board (MPOB) genetic engineering programme is to produce high oleate transgenic palms. The availability of effective transformation vector is one of the pre-requisites for genetic manipulation of oil palm through recombinant DNA technology. Here, we describe the construction of a series of transformation vectors that have a maize ubiquitin promoter (UbiPro)-driven bar gene for selection of transformants on herbicide (Basta or Bialaphos), and mesocarp-specific promoter (MSP1) for expression of the transgenes [antisense palmitoyl-ACP-thioesterase (PAT) and sense &amp;#946;-ketoacyl-ACP-synthase II (KASII) and sense &amp;#916;9-stearoyl-ACP-desaturase (SAD)] potentially responsible for high oleate content in oil palm...
Tipo: Journal article
Palavras-chave: Oleate; Transformation vectors; Transgenic oil palm.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300003

Development of trinucleotide (GGC)n SSR markers in peanut (Arachis hypogaea L.)
Provedor de dados: 69
Autores: Yuan,Mei; Gong,Limin; Meng,Ronghua; Li,Shuangling; Dang,Phat; Guo,Baozhu; He,Guohao.
Cultivated peanut (Arachis hypogaea L.) is an oilseed crop of economic importance. It is native to South America, and it is grown extensively in the semi-arid tropics of Asia, Africa, and Latin America. Given an extremely narrow genetic base, efforts are being made to develop simple sequence repeat (SSR) markers to provide useful genetic and genomic tools for the peanut research community. A SSR-enriched library to isolate trinucleotide (GGC)n SSRs in peanut was constructed. A total of 143 unique sequences containing (GGC)n repeats were identified. One hundred thirty eight primer pairs were successfully designed at the flanking regions of SSRs. A suitable polymerase was chosen to amplify these GC-rich sequences. Although a low level of polymorphism was...
Tipo: Journal article
Palavras-chave: Cultivated peanut; Microsatellites; Polymorphism; Simple sequence repeat.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600005

Developmental Anomalies of Bronchial Tree: A Multidetector Computerized Tomography Study
Provedor de dados: 77
Autores: Ulusoy,Mahinur; Kivrak,Ali Sami; Uysal,Ismihan Ilknur; Karabulut,Ahmet Kagan; Paksoy,Yahya; Fazliogullari,Zeliha.
Anomalies of the bronchial tree may cause recurrent acute pulmonary infection and persistent obstruction symptoms. The developmental anomalies of the bronchial tree were presented mostly as case reports with an accompanying anomaly. However in this study, these anomalies were detected in multidetector computerized tomography (MDCT) images which have no reported pathology. Thoracic MDCT images of 400 patients (0-74 years old, 224 male and 176 female) were evaluated. Four tracheal bronchus (1%) were detected. Three of them were displaced type, one of them was pig bronchus. And two accessory cardiac bronchus (0,5%) originated from medial wall of the intermediate bronchus were detected. According to our findings, incidence of tracheal bronchus and accessory...
Tipo: Journal article
Palavras-chave: Anomaly; Accessory cardiac bronchus; Bronchial tree; Tracheal bronchus; Multidetector computerized tomography (MDCT).
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300044

Developmental rates of bovine nuclear transfer embryos derived from different fetal non transfected and transfected cells
Provedor de dados: 69
Autores: Felmer D,Ricardo; Arias,María Elena.
Since the first successful somatic cell nuclear transfer (SCNT) experiments were carried out, a number of domestic and agriculture species have been cloned using donor cells derived from different sources and origin. However, differences in nuclear transfer efficiency both in vitro and in vivo have been generally observed. These differences may be accentuated when transgenic cell lines are used as nuclear donors in an attempt to generate transgenic cloned offspring. The present study examined the suitability of cell lines derived from 3 different fetal sources and the effects of genetic manipulation of donor fetal fibroblasts with a red fluorescent plasmid, on the in vitro developmental potential and quality of nuclear transfer derived bovine embryos. We...
Tipo: Journal article
Palavras-chave: Bovine embryos; Fetal fibroblasts; Nuclear transfer; Transfected cells.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300005

Developmental regulation of the expression of sodium currents in Xenopus primary neurons
Provedor de dados: 48
Autores: OLGUÍN,PATRICIO; ARMISEN,RICARDO; KUKULJAN,MANUEL.
The electrophysiological properties of neurons are determined by the expression of defined complements of ion channels. Nonetheless, the regulation mechanisms of the expression of neuronal ion channels are poorly understood, due in part to the diversity of neuron subtypes. We explored the expression of voltage-gated currents of Xenopus primary spinal neurons unequivocally identified by means of single-cell RT-PCR. We found that identified spinal neurons exhibit heterogeneity in the temporal appearance of voltage-gated currents. Nevertheless, all neurons progress to similar functional phenotypes. A physiological feature is the onset and increase of the expression of sodium currents. To understand the mechanisms underlying this process, we studied the effect...
Tipo: Journal article
Palavras-chave: Excitability; REST/NRSF; Neuronal differentiation; Single-cell RT-PCR transcription.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000300010

Developmental Responses of Garlic to Temperature and Photoperiod
Provedor de dados: 113
Autores: del Pozo L.,Alejandro; González A.,María Inés.
Bulb initiation and maturity of four Chilean clones of garlic (Allium sativum L.) were studied in controlled and field conditions in order to assess temperature and photoperiod requirements of selected clones. The effect of cold storage temperature prior to planting and photoperiod on bulb initiation was assessed in two clones of garlic. In one experiment bulbs were stored at 4, 7, 10, 13 and 16°C for 20, 40 or 60 days, and planted in pots in a heated greenhouse with a 14 h photoperiod. In a second experiment bulbs of the same clones were stored at 4 and 10°C, and room temperature (&gt; 13°C) for 30 days, and later grown in a heated greenhouse with 8, 10, 12, 14 or 16 h of photoperiod. In the field, days from emergence to bulb initiation and to maturity...
Tipo: Journal article
Palavras-chave: Cold requirement; Storage temperature; Ceiling photoperiod; Allium sativum L.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200001

Dextrocardia and Situs Inversus Totalis in a Nigerian Cadaver: A Case Report of Rare Anomaly
Provedor de dados: 77
Autores: Ofusori,David A; Okwuonu,Christina U; Ude,Raymond A; Adesanya,Olamide A.
This report describes an adult male cadaver with dextrocardia and situs inversus totalis in a Nigerian cadaver. The photographic illustrations revealed transposition of some of the visceral organs such that the stomach and spleen were located on the right and the liver and gall bladder on the left. Also, the left lung was tri-lobed while the right was uni-lobed. The heart was flattened and flipped to the right thus, transposing the great vessels. The report showed that dextrocardia and situs inversus exists amongst Nigerians and possibly Africans and therefore wish to recommend early medical examination since patients with this condition are unaware of their unusual anatomy until they seek medical attention for an unrelated condition. Early detection may...
Tipo: Journal article
Palavras-chave: Dextrocardia; Situs inversus; Rare anomaly; Cadaver.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300032

Diabetes-Induced Prefrontal Nissl Substance Deficit and the Effects of Neem-Bitter Leaf Extract Treatment
Provedor de dados: 77
Autores: Akinola,Oluwole B; Omotoso,Olaiya G; Dosumu,Olufunke O; Akinola,Oluwafunmike S; Olotufore,Favour.
Cognitive dysfunction is reportedly associated with poorly-managed diabetes mellitus. In this study, we report the effect of oral treatment with combined leaf extract (CLE) of neem and bitter leaf on the prefrontal cortex of diabetic Wistar rats. Adult male Wistar rats were randomized to one of the following groups: control, diabetic (STZ-induced), STZ + CLE, STZ + metformin and CLE only. At euthanasia, paraffin sections of the prefrontal cortex were stained with cresyl fast violet; while malondialdehyde (MDA) and glutathione peroxidase (GPx) were assayed in prefrontal homogenates. Oral CLE produced normoglycemia in the treated hyperglycaemic rats. Besides, Nissl-stained prefrontal sections showed no morphologic deficits in all the groups except the...
Tipo: Journal article
Palavras-chave: Pyramidal cells; Hyperglycaemia; Oxidative stress; Cognition.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300031

Diabetic Peripheral Neuropathies: A Morphometric Overview
Provedor de dados: 77
Autores: Fazan,Valéria Paula Sassoli; Vasconcelos,Carlos Augusto Carvalho de; Valença,Marcelo Moraes; Nessler,Randy; Moore,Kenneth Charles.
Diabetes is now considered one of the main threats to human health in the 21st century and many researchers are dedicated to investigate the physiopathology of the disease, with further insights on the managements of its major complications. Since understanding the pathophysiology of the major complications of diabetes and their underlying processes is mandatory, experimental models of the disease may be useful as they allow the recognition of the early mechanisms involved in the long-term complications of diabetes. Peripheral nerve involvement is highly frequent in diabetes mellitus and it has been documented that one third of diabetic patients have peripheral neuropathy. The true prevalence is not known and reports vary from 10% to 90% in diabetic...
Tipo: Journal article
Palavras-chave: Diabetes; Experimental models; Neuropathy; Morphometry.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100007

Diabetic retinopathy: could the alpha-1 antitrypsin be a therapeutic option?
Provedor de dados: 48
Autores: Ortiz,Gustavo; Salica,Juan P; Chuluyan,Eduardo H; Gallo,Juan E.
Diabetic retinopathy is one of the most important causes of blindness. The underlying mechanisms of this disease include inflammatory changes and remodeling processes of the extracellular-matrix (ECM) leading to pericyte and vascular endothelial cell damage that affects the retinal circulation. In turn, this causes hypoxia leading to release of vascular endothelial growth factor (VEGF) to induce the angiogenesis process. Alpha-1 antitrypsin (AAT) is the most important circulating inhibitor of serine proteases (SERPIN). Its targets include elastase, plasmin, thrombin, trypsin, chymotrypsin, proteinase 3 (PR-3) and plasminogen activator (PAI). AAT modulates the effect of protease-activated receptors (PARs) during inflammatory responses. Plasma levels of AAT...
Tipo: Journal article
Palavras-chave: Diabetic retinopathy; Alpha-1-antitrypsin; Diabetes; Endogenous anti-inflammatory agents; Retinal inflammation; NF-kB.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100052

Diagnosis to Detect Porcine Transmissible Gastroenteritis Virus (TGEV) by Optical and Transmission Electron Microscopy Techniques
Provedor de dados: 77
Autores: Martins,A. M. C. R. P. F; Bersano,J. G; Ogata,R; Amante,G; Nastari,B. D. B; Catroxo,M. H. B.
The porcine transmissible gastroenteritis is a highly severe contagious disease, caused by virus of the Coronaviridae family, genus Coronavirus. Its epizootic shape can reach a rate of up to 100% mortality in piglets under two weeks of age as a result of severe dehydration. In this study fragments of small intestine and stool samples were collected from 75 autopsied pigs from properties. The samples of the fragments were frozen and sent to the Laboratory of Electron Microscopy, Instituto Biológico, SP, Brazil, for histological and transmission electron microscopic analyses. According to histological H&amp;E technique, atrophy, villous necrosis and destruction of the enterocytes were observed in 35 (46.6%) out of the 75 fragments of the small intestine...
Tipo: Journal article
Palavras-chave: Porcine Transmissible Gastroenteritis; Coronavirus; Histopathology; Transmission Electron Microscopy.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200059

Diaphanization: A Standardized Protocol for Non-Fetal Tissue Preservation
Provedor de dados: 77
Autores: Rueda-Esteban,Roberto Javier; Palacio Varona,Juliana; López-McCormick,Juan Sebastián; Hernández Restrepo,Juan David.
In response to the arising difficulty of dissection use during anatomy courses, medical schools have been forced to research alternative teaching methods. These are meant to help students develop three dimensional mental images of the human body and increase spatial reasoning, thus improving the learning process of human morphology. One of those methods, used at the Universidad de los Andes is the Diaphanization process. This technique is a well-known method for specimen preservation, used as an anatomy research and teaching tool. Even though it is frequently used, finding a standardized protocol in indexed journals is not possible, which hinders the use of the technique. The standardization of an updated protocol is a need in order to continue exploiting...
Tipo: Journal article
Palavras-chave: Teaching of anatomy; Diaphanization; Preservation of Adult Tissue; Standardized protocol.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200027

Diaphyseal Nutrient Foramina in the Femur, Tibia and Fibula Bones
Provedor de dados: 77
Autores: Collipal,Erika; Vargas,Ramiro; Parra,Ximena; Silva,Héctor; del Sol,Mariano.
The nutrient foramina of the femur and fibula are located in the middle third of the diaphysis of these bones, on the other hand in the tibia it's in the proximal third of its diaphysis. With the objective of complementing the information delivered by other authors, we investigated the location, the number of diaphysis foramines, the distance or position of the foramines in relation to the length of the bone and the proximal epiphysis and the diameter of the bone at the height of the foramen. For that purpose, we used 140 dry bones (50 femora, 50 tibiae and 40 fibulae) of adult subjects of both sexes from the Anatomy Museum Faculty of Medicine, Universidad de La Frontera, Temuco, Chile. The nutrient foramen of the femur was located in the linea áspera in...
Tipo: Journal article
Palavras-chave: Nutrient foramen; Bones; Lower limb.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200010

Días a floración en espinaca (Spinacia oleracea L.) en diversas épocas de siembra: respuesta a la temperatura y al fotoperíodo
Provedor de dados: 113
Autores: González,María Inés; del Pozo,Alejandro; Cotroneo,Daniel; Pertierra,Rosa.
Se evaluaron los días a floración (f) en espinaca (Spinacia oleracea L.) cvs. Baker, Olympia, Shasta y Viroflay, en siembras secuenciales durante 12 meses en el campo experimental del Instituto de Investigaciones Agropecuarias en Chillán (36°32’ lat. Sur, 71°55’ long. Oeste), con el fin de determinar la influencia de la temperatura y del fotoperíodo en la tasa de progreso a floración (&lt;FONT FACE=Symbol&gt;¦&lt;/FONT&gt; -1). El tiempo entre siembra y 50% de floración varió entre los 43 y 60 días en los regímenes más inductivos y entre los 131 y 148 días en los regímenes menos inductivos. Los modelos fenológicos que relacionan &lt;FONT FACE=Symbol&gt;¦&lt;/FONT&gt; -1 con la temperatura y el fotoperíodo medio explicaron la mayor parte de la variación en...
Tipo: Journal article
Palavras-chave: Desarrollo; Fenología; Modelos; Tasa de floración.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000400001

DIATOMEAS (BACILLARIOPHYCEAE) DE ZONAS ANDINAS DEL NORTE DE CHILE: NUEVA LOCALIDAD GEOGRÁFICA PARA HALOROUNDIA SPECIOSA (HUSTEDT) DIAZ ET MAIDANA
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola.
This note reports the first finding of Haloroundia speciosa (Hustedt) Diaz et Maidana (Bacillariophyceae) in a sample collected from the Salar de Aguas Calientes, Loa Province, northern Chile (23°30'S; 67°33'W). This species is restricted to the Andes Mountains. Comments about its morphological features and geographical distribution in north Andean areas are given.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200013

Diatomeas marinas de aguas costeras de la provincia de Buenos Aires (Argentina).: III Géneros potencialmente nocivos Asterionellopsis, Cerataulina, Ceratoneis y Leptocylindrus
Provedor de dados: 97
Autores: SUNESEN,INÉS; SAR,EUGENIA A.
El presente trabajo está abocado al estudio morfológico, taxonómico y distribucional de las especies de diatomeas pertenecientes a los géneros Asterionellopsis, Cerataulina, Ceratoneis y Leptocylindrus halladas en aguas costeras marinas de la provincia de Buenos Aires, Argentina. Las muestras planctónicas fueron colectadas en San Clemente del Tuyú, Santa Teresita, La Lucila del Mar, Mar de Ajó, Nueva Atlantis, Pinamar y Villa Gesell, entre noviembre de 1994 y septiembre de 2000. Material sin tratar y tratado fue analizado con microscopio óptico y microscopio electrónico de barrido. Seis taxa correspondientes a los géneros mencionados fueron determinados, de los cuales Cerataulina dentata es citada por primera vez para Argentina y Leptocylindrus minimus es...
Tipo: Journal article
Palavras-chave: Diatomeas; Asterionellopsis; Cerataulina; Ceratoneis; Leptocylindrus; Especies nocivas.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400010

Didymosphenia geminata (Lyngbye) M. Schmidt y Gomphoneis minuta (Stone) Kociolek &amp;amp; Stoermer (Bacillariophyta), especies presentes en ríos de la VIII Región, Chile, formadoras de proliferaciones con aspecto muy similar
Provedor de dados: 73
Autores: BASUALTO,SILVIA; RIVERA,PATRICIO; CRUCES,FABIOLA; ECTOR,LUC; ASCENCIO,ENRIQUE.
ABSTRACT A light brown colored massive algal proliferation found in a large area of Rio Laja, Chile was studied. The bloom was produced by Gomphoneis minuta, a gomphonemoid diatom forming large branched stalks attached to submerged rocks. At first glance and on account the macroscopic appearance, this type of proliferation could be confused with that of Didymosphenia geminata. Considering its massive presence in Rio Laja and increased distribution in Chilean waters, as well is occurring in many European and American rivers, we postulate that G. minuta could be a nuisance species in Chilean rivers, and similar to D. geminata, it must be controlled to verify its propagation in the country.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200457

Diel vertical migration patterns of three zooplankton populations in a Chilean lake
Provedor de dados: 97
Autores: RAMOS-JILIBERTO,RODRIGO; CARVAJAL,JOSÉ L.; CARTER,MAURICIO; ZÚÑIGA,LUIS R.
In this work we analyzed the depth-distribution, at noon and midnight, of three zooplankton populations which are common inhabitants of lakes from central Chile and coexist in lake El Plateado. The species were Tumeodiaptomus diabolicus, Diaphanosoma chilense and Bosmina longirostris. Also, we analyzed the association between the depth-specific abundances of the groups and the depth-specific temperature and oxygen values during the sampling period. Our results show that: (1) the three population exhibited diel vertical migration during part of the year; (2) T. diabolicus and D. chilense exhibited the normal pattern of vertical migration, and B. longirostris presented both the normal and the reverse pattern; (3) for all species and most dates, zooplankters...
Tipo: Journal article
Palavras-chave: Depth-selection; Cladocera; Copepoda; Reverse vertical migration; Chile.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000100004

Diet and Endothelial Function
Provedor de dados: 48
Autores: CUEVAS,ADA M; GERMAIN,ALFREDO M.
Endothelial dysfunction is one of the earliest events in atherogenesis. A consequence of endothelial damage is a lower availability of nitric oxide (NO), the most potent endogenous vasodilator. NO inhibits platelet aggregation, smooth muscle cell proliferation and adhesion of monocytes to endothelial cells. Endothelial dysfunction is present in patients with cardiovascular disease and/or coronary risk factors, such as hypertension, dyslipidemia, diabetes, smoking or hyperhomocysteinemia. At present, soluble markers and high resolution ultrasound of the brachial artery, have provided simple tools for the study of endothelial function and the effects of several interventions. It has been demonstrated that dietary factors may induce significant changes on...
Tipo: Journal article
Palavras-chave: Diet; Endothelial function; Nitric oxide; Vascular reactivity.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200008

Diet high in &amp;#945;-linolenic acid up-regulate PPAR-&amp;#945; gene expression in the liver of goats
Provedor de dados: 69
Autores: Ebrahimi,Mahdi; Rajion,Mohamed Ali; Meng,Goh Yong; Farjam,Abdoreza Soleimani; Oskoueian,Ehsan; Jafari,Saeid.
Background There is little information on the effects of diets containing high &amp;#945;-linolenic acid (C18:3n-3) on liver lipid composition and lipogenic gene expressions. In this study fourteen goats (Capra aegagrus hircus) were fed either a flaxseed oil (FSO) supplemented diet containing high &amp;#945;-linolenic acid or a control diet without added flaxseed oil (CON) for 100-d to evaluate the effects on liver lipid composition and the gene expression of peroxisome proliferator-activated receptors (PPAR-&amp;#945;) and stearoyl-CoA-desaturase (SCD) in the liver. Results An increase in the levels of C18:3n-3 and C20:5n-3, C22:5n-3, C22:6n-3 was observed in the liver of FSO-treated goats. There was a significant (P &lt; 0.05) up-regulation of...
Tipo: Journal article
Palavras-chave: Gene expression; Goat; Liver; Omega-3 fatty acid; PPAR.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300011

Diet of guanaco in sheep-free rangeland in Tierra del Fuego, Chile
Provedor de dados: 118
Autores: Muñoz,Alejandra E; Simonetti,Javier A.
Guanaco (Lamaguanicoe), the only native ungulate of Tierra del Fuego, uses the forests more extensively after the introduction of sheep. It is presumed that the regeneration of lenga (Nothofagus pumilio) is hampered by guanaco browsing. In this context, the diet of guanaco in Tierra del Fuego was evaluated through a microhistological analysis of feces in a livestock-free area dominated by lenga forest. Guanacos behaved largely as herbivorous grazers and exhibited seasonal variations in their grazing habits. Compared to other studies in Tierra del Fuego, which were conducted in areas where sheep and guanaco grazed together, we reported that the guanacos avoided and consumed fewer trees. These results have management implications, as the proper management of...
Tipo: Journal article
Palavras-chave: Lama guanicoe; Nothofagus pumilio; Feeding habits; Microhistological analysis.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100016

DIET OF TADPOLES FROM A POND IN IGUAZU NATIONAL PARK, ARGENTINA
Provedor de dados: 72
Autores: Echeverría,Dinorah D; Volpedo,Alejandra V; Mascitti,Virginia I.
Gut contents of anuran larva (Elachistocleis bicolor, Chaunus schneideri, Odontophrynus americanus, Scinax fuscovarius, and S. granulatus) that coexist in a semi-permanent waterbody from Iguazú National Park (Misiones, Argentina) was analyzed. Our objective was analyse the gut contents of different tadpole species that coexist in the same water body during seasons of minimum and maximum precipitation, to increase the knowledge of the natural history of these tadpoles. Elachistocleis bicolor (obligate-suspension-feeder) it presents only planktonic algae in its gut (92%). In gut of S. fuscovarius and S. granulatus (nektonic) planktonic algae were abundant, especially in the rainy season (14 and 41%). The guts of C. schneideri and O. americanus (benthic)...
Tipo: Journal article
Palavras-chave: Anura tadpoles feeding; Diet Iguazú National Park.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100002

Diet of the American mink Mustela vison and its potential impact on the native fauna of Navarino Island, Cape Horn Biosphere Reserve, Chile
Provedor de dados: 97
Autores: SCHÜTTLER,ELKE; CÁRCAMO,JAIME; ROZZI,RICARDO.
Invasive exotic species of mammalian predators represent a major cause of vertebrate animal extinctions on islands, particularly those that lack native mammalian carnivores. In 2001, the American mink (Mustela vison) was recorded for the first time on Navarino Island, in the Cape Horn Biosphere Reserve (55° S) in Chile, representing the southernmost population of mink worldwide. In order to assess its potential impact on native fauna, we studied its diet on Navarino Island, as part of an integrative management program on invasive species. Over a three-year period (2005-2007) we collected 512 scats in semi-aquatic habitats: marine coasts, riparian and lake shores. Overall, the main prey was mammals (37 % biomass), and birds (36 %), followed by fish (24 %)....
Tipo: Journal article
Palavras-chave: Conservation; Exotic mammals; Management; Mustelids; Waterbirds.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400011

Diet of the Chilean flamingo Phoenicopterus chilensis (Phoenicopteriformes: Phoenicopteridae) in a coastal wetland in Chiloé, southern Chile
Provedor de dados: 97
Autores: Tobar,Claudio N; Rau,Jaime R; Fuentes,Norka; Gantz,Alberto; Suazo,Cristián G; Cursach,Jaime A; Santibañez,Alexis; Pérez-Schultheiss,Jorge.
BACKGROUND: The geographical distribution of the Chilean flamingo (Phoenicopterus chilensis) includes the southern-central Neotropics. Despite its wide distribution, currently there is no dietary information on its southern distribution range. From June to September 2011, we quantified the diet and prey availability of the Chilean flamingo in the marine wetland of Caulín (41°48' S, 73°37' W), southern Chile. RESULTS: The prey availability related to both plankton and benthos were four species of copepods, four polychaetes, one foraminifera, and two amphipods. The diet of the Chilean flamingo was composed of foraminifera (Ammonia beccarii), copepods (Harpacticus sp.) and polychaetes. The most abundant prey items from feces of flamingos were Ammonia beccarii...
Tipo: Journal article
Palavras-chave: Copepods; Diet selectivity; Migration; Trophic ecology.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100014

Diet of the coati Nasua nasua (Carnivora: Procyonidae) in an area of woodland inserted in an urban environment in Brazil
Provedor de dados: 97
Autores: FERREIRA,GIOVANNE A; NAKANO-OLIVEIRA,EDUARDO; GENARO,GELSON; LACERDA-CHAVES,ADMA K.
Coatis are omnivores whose diet consists of small vertebrates, invertebrates, and fruit. In urban areas, they may ingest food waste that has been discarded in deposits near their habitat, or they may consume food offered by humans. The present work investigates the diet of coatis through analysis of 56 fecal samples collected from Morro Imperador, a fragment of woodland inserted into an urban center in the municipality of Juiz de Fora, State of Minas Gerais, Brazil. The results point to a diet with niche breadth of 0.4 in which the percentage of occurrence of insects (34.9 %) and fruit (19.9 %) comprise the main dietary items. The presence of food due to human action (direct or indirect) is also constant throughout the year (14.1 %), thereby demonstrating...
Tipo: Journal article
Palavras-chave: Anthropic influence; Atlantic Forest; Diet alteration; Trophic ecology.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000100008

DIETA DE LYCALOPEX CULPAEUS (Mammalia: Canidae) EN EL EXTREMO NORTE DE CHILE (REGION DE TARAPACA)
Provedor de dados: 72
Autores: Guzmán-Sandoval,Jonathan; Sielfeld,Walter; Ferrú,Marcos.
Se analizaron 22 heces de Lycalopex culpaeus recolectadas durante septiembre de 1996, en el oasis de neblina Alto Chipana, ubicado a 130 kilómetros al sur de Iquique, en el farellón costero de la Región de Tarapacá (Chile). Se describe la incidencia de cuatro rubros alimentarios principales (mamíferos, aves, reptiles, y artrópodos) en la frecuencia de ocurrencia (%F) y abundancia relativa (%N). Lycalopex culpaeus depreda mayoritariamente sobre artrópodos con una abundancia de 88,8% y una frecuencia de ocurrencia de 72,7%, le siguen los reptiles (N: 6,6%; F: 41 %), micromamíferos (N: 4,6%; F: 36,4%), y aves (N: 3.6%; F: 31,8%). La presencia del reptil Microlophus sp. y del roedor Phyllotis darwini en las heces de L. culpaeus sugieren que éste es un...
Tipo: Journal article
Palavras-chave: Lycalopex culpaeus; Hábitos alimentarios; Oasis de neblina; Altos de Chipana; Chile.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100001

DIETA DE LYCALOPEX GRISEUS (GRAY, 1837) (MAMMALIA: CANIDAE) EN LA DEPRESION INTERMEDIA DEL SUR DE CHILE
Provedor de dados: 72
Autores: Zúñiga,Alfredo; Muñoz-Pedreros,Andrés; Fierro,Andrés.
A study about food habits of chilla (Lycalopex griseus) was done in a sector of the intermediate depression of southern Chile, called Predio Rucamanque, Region de la Araucanía. Faeces were collected through three seasons of the year, identifying their diet composition. Results show a trend towards small mammals followed by birds, and in a lesser ratio, insects.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100013

DIETA DE ORESTIAS AGASSII (CUVIER &amp;amp; VALENCIENNES, 1846) (TELEOSTEI: CYPRINIDONTIDAE) DEL SALAR DEL HUASCO, NORTE DE CHILE
Provedor de dados: 72
Autores: Guzmán,Jonathan A; Sielfeld,Walter.
Se estudió la dieta de Orestias agassii en tres lagunas asociadas al Salar del Huasco en el altiplano de la I Región. El contenido estomacal presentó; ostracodos, anfípodos, copépodos, moluscos, coleópteros, ácaros y algas macrófitas. Los resultados permiten afirmar que O. agassii es un predador carnívoro, que consume una amplia variedad de microcrustaáeos que busca activamente entre la vegetación.
Tipo: Journal article
Palavras-chave: Orestias agassii; Dieta; Comunidades de agua dulce; Altiplano sudamericano.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100004

Dieta de Phytotoma rutila (Passeriformes: Cotingidae) en el desierto del Monte central, Argentina
Provedor de dados: 72
Autores: RÍOS,JUAN MANUEL; ZARCO,AGUSTÍN; MOSCA-TORRES,MARÍA E.; SABAT,PABLO.
Se determinó la composición botánica de la dieta del Cortarramas Phytotoma rutila en el desierto del Monte central, Argentina, mediante análisis microhistológico de las heces. En ambos sexos, la dieta estuvo compuesta por una importante proporción de frutos (26.8%) y hojas (35.6%) del arbusto Lycium tenuispinosum (Solanaceae) y hojas del árbol Prosopis flexuosa (Fabaceae) (26.8%). P. rutila es una ave predominantemente folívora con un alto consumo de frutos durante el verano, cuando estos ítems son abundantes, lo que refleja su comportamiento oportunista.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000100003

Dieta del aguilucho común Geranoaetus polyosoma (Quoy &amp;amp; Gaimard 1824) en la Región de Atacama, Chile
Provedor de dados: 72
Autores: VALLADARES FAÚNDEZ,PABLO; ÁLVAREZ HENRÍQUEZ,NICOLE; URRUTIA OSORIO,NATALIA; OLIVARES ZULETA,FLAVIO; ALVARADO ORELLANA,SERGIO.
El aguilucho común (Geranoaetus polyosoma) es una especie de ave rapaz que se distribuye desde Arica a Tierra del Fuego en Chile. Se alimenta de pequeños vertebrados e invertebrados, particularmente insectos y arácnidos. No existe suficiente información biológica de esta especie en el norte de Chile, desconociéndose su reproducción, dieta, etc. En este trabajo evaluamos la dieta del aguilucho común, por medio del análisis de egagrópilas colectadas entre las localidades de Vallenar y Copiapó, Región de Atacama, la que corresponde a una zona híperárida. Esta información fue comparada con la literatura científica existente en el resto del país y países limítrofes. Dada las condiciones ambientales de extrema aridez, esperamos encontrar una baja diversidad de...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200001

Dieta del quique (Galictis cuja Molina 1782) en un remanente de bosque valdiviano fragmentado del sur de Chile
Provedor de dados: 72
Autores: Sade,Soraya; Rau,Jaime R; Orellana,José I.
Pese a su amplia distribución y uso de diferentes hábitats en América del Sur existe poca información sobre el quique, Galictis cuja (Carnívora: Mustelidae). Inicialmente descrito como un mamífero generalista que vive cerca de ríos y con una dieta católica, estudios en Uruguay, Chile central y Argentina han mostrado que se especializa en roedores nativos y lagomorfos introducidos. En este trabajo se documenta por primera vez su dieta otoño-invernal en un remanente de bosque valdiviano fragmentado. En estas estaciones climáticas, donde la abundancia de roedores aumenta, la mayor frecuencia estandarizada de presas en la dieta del quique (82%) correspondió a 6 especies de roedores nativos cuyas masas corporales variaron entre 24 y 58 gramos. Pese a haber...
Tipo: Journal article
Palavras-chave: Carnívoros; Ecorregión valdiviana; Fragmentación; Hábitos alimenticios.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300004

Dietary protein and carbohydrate affect feeding behavior and metabolic regulation in hummingbirds (Melanotrochilus fuscus)
Provedor de dados: 97
Autores: ZANOTTO,FLAVIA P.; BICUDO,J.E.P.W.
The objective of this work was to link hummingbird feeding behavior with metabolic regulation and in addition to assess whether dietary composition would affect entrance into torpor. Hummingbirds were fed a combination of diets with contrasting amounts of protein and carbohydrate. The diets were composed of the following: 2.4 % protein (P) - 12 % sucrose (S) and 0.8 % protein (P) - 36 % sucrose (S). The main findings showed that periods of feeding on each of the diets could be distinguished as separate bouts or feeding events. Hummingbirds presented to high protein-low carbohydrate diets (2.4P-12S) ingested a larger volume of diet, fed for longer (both around 1.7x) and increased the interval between feedings compared with hummingbirds fed diets 0.8P-36S....
Tipo: Journal article
Palavras-chave: Hummingbird feeding; Carbohydrate and protein interaction; Unbalanced diet; Feeding behavior; Torpor.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200012

Dietas de Abrothrix andinus, Phyllotis xanthopygus (Rodentia) y Lepus europaeus (Lagomorpha) en un ambiente altoandino de Chile
Provedor de dados: 97
Autores: LÓPEZ-CORTÉS,FRANCISCO; CORTÉS,ARTURO; MIRANDA,EDUARDO; RAU,JAIME R.
Los roedores nativos Abrothrix andinus, Phyllotis xanthopygus y el lagomorfo introducido Lepus europaeus, coexisten en ambientes altoandinos del centro-norte de Chile, donde la disponibilidad de alimento es escasa y distribuida heterogéneamente en el paisaje. Propusimos que en estos ambientes las especies en estudio se comportarían como herbívoros generalistas y que existiría una alta sobreposición en la dieta entre la liebre y los roedores nativos. El objetivo de este trabajo fue documentar la composición de la dieta de las tres especies y determinar su amplitud, preferencia y sobreposición en la dieta a partir del análisis microhistológico de heces frescas. Los resultados indican que las tres especies se comportaron como herbívoros-folívoros, siendo la...
Tipo: Journal article
Palavras-chave: Ambiente altoandino; Dieta; Liebres; Roedores nativos; Selección dietaria; Sobreposición dietaria.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000100001

Diet-induced developmental plasticity in life histories and energy metabolism in a beetle
Provedor de dados: 97
Autores: URREJOLA,SERGIO; NESPOLO,ROBERTO; LARDIES,MARCO A.
Adaptive phenotypic plasticity, has been recognized as an important strategy by which organisms maximize fitness in variable environments, which vary through development. A disassociation among stages should represent a null effect of the environment experienced during early ontogeny in the expression of adult traits. Food quality greatly influences survival, development and reproduction in many arthropod herbivores. We examined the effects of diet protein in physiological and life-history traits in the yellow mealworm beetle Tenebrio molitor through ontogeny. We established four experimental treatments: Low Protein (LP), Low Protein Control (LPC), High Protein (HP), and High Protein Control (HPC) with recently eclosioned larvae each. Individuals were...
Tipo: Journal article
Palavras-chave: CO2 production; Complex life-cycle; Food quality; Metabolism; Ontogeny.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000400005

Diferencia en la Población de Células Cebadas de Glándulas Apocrinas de Sacos Anales de Perros Adultos y Seniles
Provedor de dados: 77
Autores: Delgado-Ramírez,J. L; Aragón,H. J; Pérez-Martínez,M.
Se estudió la población de células cebadas (CC) presentes en sacos anales de perros adultos y seniles mediante su conteo en cortes de tejido procesado con la técnica de inclusión en parafina y teñidos con azul de toluidina. El promedio de CC obtenido para el grupo de perros adultos jóvenes fue de 18,16 ± 7,58 (n=12 perros) y para el grupos de adultos maduros fue de 73,75 ± 16,29 (n=12 perros). Al comparar el número de células de ambos grupos con la prueba de U Mann-Withney se encontró que son significativamente diferentes (P&lt; 0,0001), siendo mayor en el grupo de perros seniles. Esta mayor población de CC puede estar relacionada con una mayor susceptibilidad de los perros seniles a reacciones inflamatorias del tejido de los sacos anales causadas por...
Tipo: Journal article
Palavras-chave: Perro; Glándulas anales apocrinas; Células cebadas; Edad; Histología.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200050

Diferenciación genética de Merluccius gayi gayi y Merluccius gayi peruanus (Pisces, Merlucciidae) y antecedentes paleogeográficos de su área de distribución
Provedor de dados: 97
Autores: HERNANDEZ,CRISTIAN; GALLEGUILLOS,RICARDO; OYARZUN,CIRO.
Se han planteado variadas hipótesis sobre relaciones taxonómicas entre las especies de Merluccius, proponiéndose la existencia de dos subespecies Merluccuis gayi gayi y Merluccius gayi peruanus en el Pacífico Sureste; aunque hasta el momento no existen evidencias suficientes que respalden tal hipótesis. En el presente trabajo se analizan las diferencias genéticas entre ambas subespecies mediante electroforesis de proteínas. Se procesaron 25 individuos de M. gayi gayi de la zona de Talcahuano (Chile) y 25 individuos de M. gayi peruanus del Puerto de Paita (Perú). Se detectó el producto génico de 33 loci homólogos. Los taxa presentan movilidad diferencial de los alelos en los loci monomórficos EM-2*, AP-1* y CA-1* y en el locus polimórfico EST-3*. Merluccius...
Tipo: Journal article
Palavras-chave: Merluza; Distancia genética; Paleobiogeografía; Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100003

DIFERENCIACION MORFOLÓGICA DE POBLACIONES DE TRICHOMYCTERUS AREOLATUS VALENCIENNES 1846 (PISCES: SILURIFORMES: TRICHOMYCTERIDAE) DE CHILE
Provedor de dados: 72
Autores: Pardo,Rodrigo.
En Chile Trichomycterus areolatus se distribuye desde Limarí (30° 42' S) hasta Puerto Varas (41° 19' S). En la actualidad, las poblaciones que habitan los extremos de distribución de esta especie no presentan ningún tipo de flujo génico, debido a que las hoyas hidrográficas que habitan no poseen conexión entre sí. Este aislamiento reproductivo, sumado a las distintas características hidrológicas de los ríos de la zona norte con respecto al sur, podría haber inducido un proceso de especiación de las poblaciones más alejadas. Para conocer el grado de semejanza entre las poblaciones se compararon muestras provenientes de los extremos de distribución, utilizando morfometría geométrica, anali-zándose 20 individuos del río Bío-Bío y 20 del río Choapa,...
Tipo: Journal article
Palavras-chave: Chile; Trichomycterus areolatus; Distribución; Morfometría geométrica.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200015

Diferenciación morfológica en especies del género Cheirodon (Ostariophysi: Characidae) mediante morfometría tradicional y geométrica
Provedor de dados: 72
Autores: Salas,Daniel; Véliz,David; Scott,Sergio.
Los peces dulceacuícolas del género Cheirodon están representados en Chile por cinco especies: Cheirodon pisciculus, Ch. australe, Ch. galusdae, Ch. kiliani y Ch. interruptus, esta última introducida accidentalmente desde Argentina. La escasa diferenciación morfológica, además de la asociación simpátrica de Ch. pisciculus con Ch. interruptus y de Ch. galusdae con Ch. australe en parte de sus distribuciones, dificultan su identificación, por cuanto es útil conocer las diferencias y similitudes morfológicas de estas cuatro especies. Examinando 14 medidas morfológicas mediante Análisis Discriminante (LDA) y Análisis de Componentes Principales (PCA), se obtuvo una separación significativa entre las especies, con especial consideración a caracteres asociados...
Tipo: Journal article
Palavras-chave: Peces; Función de placa delgada; Análisis discriminante.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300007

Diferencias en la Composición Corporal y Somatotipo de Escolares de Etnia Mapuche y no Mapuche de la Comuna de Temuco - Chile
Provedor de dados: 77
Autores: Bruneau-Chávez,José; España-Romero,Vanesa; Lang-Tapia,Morín; Chillón Garzón,Palma.
Los cambios culturales y demográficos en la etnia Mapuche chilena, han generado modificaciones en estilos de vida y la estructura morfofuncional de su población, incentivando de esta forma el estudio del estado de salud en jóvenes chilenos. El objetivo de este estudio fue analizar las diferencias en composición corporal y somatotipo entre niños Mapuche y no-Mapuche de la Comuna de Temuco en Chile. Participaron 122 niños Mapuche y 146 niños no-Mapuche entre 10 y 13 años. Se recogieron medidas de peso, talla; pliegues cutáneos y diámetros óseos; siguiendo el protocolo de la Sociedad Internacional para el desarrollo de la cineantropometría (ISAK). Se determinó el índice de masa corporal (IMC), estado nutricional, grasa corporal total y somatotipo (endomorfía,...
Tipo: Journal article
Palavras-chave: Composición corporal; Somatotipo; Estado nutricional; Escolares; Etnia Mapuche.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300029

DIFERENCIAS EN LA COMPOSICIÓN VEGETAL DE UN BOSQUE DE ARAUCARIA ARAUCANA(MOLINA) K. KOCH Y NOTHOFAGUS ANTÁRCTICA(G. FORST.) OERST: ASOCIADAS A UN GRADIENTE DE INVASIÓN DE PINUS CONTORTADOUGLAS EX LOUDON
Provedor de dados: 73
Autores: Urrutia,Jonathan; Pauchard,Aníbal; García,Rafael A.
Las coníferas son el grupo de plantas más estudiado en la biología de las invasiones, ya que fuera de su área de distribución natural son capaces de generar altos impactos comunitarios y ecosistémicos. Pinus contorta es en la actualidad una de las especies arbóreas más invasoras del mundo, especialmente en ecosistemas templados. Este trabajo tiene por objetivo determinar si la composición de la vegetación invadida difiere a lo largo del gradiente de invasión de P. contorta en la Reserva Nacional Malalcahuello, ubicada en el cordón montañoso andino de la Región de la Araucanía, centro-sur de Chile. Se levantaron 18 parcelas rectangulares de 100 m² en el área invadida, en transectos ubicados desde la fuente de semillas hasta el bosque nativo. Al interior de...
Tipo: Journal article
Palavras-chave: Abundancia; Gradiente de invasión; Kernel de dispersión; Riqueza.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100010

Diferencias en la flora herbácea y arbustiva entre claros y áreas bajo dosel en un bosque de Nothofagus pumilio en Argentina
Provedor de dados: 97
Autores: DAMASCOS,M. ANGÉLICA; RAPOPORT,EDUARDO H.
Se comparó la distribución de las hierbas y arbustos bajo el dosel y en dos tamaños de claros del bosque deciduo de Nothofagus pumilio de Argentina. La riqueza total y promedio de especies por cuadrado fueron similares bajo el dosel y en los claros pequeños (diámetro mayor &lt; 5 m) y medianos (diámetro mayor entre 5-10 m). Las especies generalistas fueron las más numerosas (46 %), mientras que el 19 % correspondió a especies heliófobas y el 15 % a heliófilas obligadas y facultativas. La ausencia de diferencias en la riqueza de especies entre los ambientes comparados puede ser atribuida a: (1) la alta frecuencia de especies generalistas, (2) el bajo efecto de la formación de los claros en la distribución de las especies heliófobas, (3) la persistencia de...
Tipo: Journal article
Palavras-chave: Especies heliófobas; Especies heliófilas; Especies generalistas; Dinámica de claros; Riqueza de especies; Sotobosque.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000300001

Diferencias en las historias de vida de dos especies de isópodos bopíridos (Isopoda: Epicaridea) que parasitan al nape Neotrypaea uncinata (Milne-Edwards, 1837) (Decapoda: Thalassinidea)
Provedor de dados: 97
Autores: MUÑOZ,GABRIELA.
En ambientes costeros de Concepción, Chile, se han registrado dos especies de isópodos, Ione ovata Shiino, 1964 e Ionella agassizi Bonnier, 1900, parásitos en las cámaras branquiales del nape Neotrypaea uncinata (H. Milne Edwards, 1837). La prevalencia de parasitismo sin embargo, es mucho menor en Ione ovata quien además presenta menor frecuencia de parejas cohabitando una misma branquia, aunque posee una especificidad comparativamente menor que I. agassizi. Esto sugiere que ambas especies poseen historias de vida contrastantes. Para mejorar el entendimiento de las causas de estas diferencias, en este estudio se analizan y comparan algunos rasgos de la historia de vida de los isópodos (fecundidad, tamaño de los huevos, inversión reproductiva, y capacidad...
Tipo: Journal article
Palavras-chave: Isópodos bopíridos; Estrategias reproductivas; Fecundidad; Tamaño huevos; Transformación morfológica; Napes; Crustáceos.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400003

Diferencias genéticas y morfológicas de los estados inmaduros de dos razas de Rhagoletis conversa (Bréthes) (Diptera: Tephritidae) asociadas a plantas Solanum: distribución geográfica y posible origen en simpatría de una nueva especie
Provedor de dados: 97
Autores: FRÍAS,DANIEL A.
Se describen las diferencias alozímicas y morfológicas de los estados inmaduros de dos razas de Rhagoletis conversa (Bréthes) que desarrollan sus ciclos de vida en dos plantas del género Solanum. La variación genética y morfológica es mayor en la población asociada a S. tomatillo y presumiblemente es la especie ancestral de la cual habría surgido la raza asociada a S. nigrum que a la luz de los resultados correspondería a una nueva especie que se habría originado en simpatría
Tipo: Journal article
Palavras-chave: Diferencias genéticas y morfológicas; Especiación simpátrica; Estados inmaduros; Rhagoletis conversa; Rhagoletis brncici.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000013

Diferencias Osteológicas entre los Subgéneros Profundulus y Tlaloc (Teleostei: Profundulidae)
Provedor de dados: 77
Autores: González-Díaz,Alfonso Ángel; Díaz-Pardo,Edmundo; Soria-Barreto,Miriam; Martínez-Ramírez,Emilio.
El género Profundulus es uno de los grupos de peces más antiguos, distribuidos al norte de América Central en México, Guatemala y Honduras. No obstante, son pocos los trabajos que se han realizado para conocer el número de especies que lo conforman y sus relaciones filogenéticas. Históricamente se reconoció que este taxón estaba conformado por dos grupos naturales, actualmente considerados como los subgéneros Profundulus y Tlaloc. Recientes investigaciones genéticas han revelado un alto grado de diferenciación entre ambos taxones y algunas de sus especies, lo cual probablemente este asociado a cambios morfológicos. De esta manera, se realizó la comparación osteológica entre seis especies de los subgéneros Profundulus y Tlaloc (Cyprinodontidae:...
Tipo: Journal article
Palavras-chave: Cyprinodontiformes; Centroamérica; Peces dulceacuícolas; Osteología comparada; Neurocraneo; Branquiocraneo.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300053

Differences in Bodily Growth Between Young Footballers and Basketball Players
Provedor de dados: 77
Autores: Rexhepi,Agron; Brestovci,Behlul.
Human body growth means structural changes of human body, whereas development means its functional changes. The purpose of this study was to study the influence of different sports in bodily growth of the young athletes. In order to analyze the influence of different sports profiles on human physical growth, in this study, 3011 footballers and 393 basketball players were tested. Two groups of athletes, according to their ages have been separated in four groups (ages 13,14,15 and 16 years old). The evaluation of bodily growth of young athletes has been tested based on changes of nine morphometrical variables. The data obtained were analyzed in terms of basic statistical parameters, whilst the differences between independent groups were analyzed by T-test...
Tipo: Journal article
Palavras-chave: Growth; Footballers; Basketball players; Morphometrical variables; Discriminant canonical analyses.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200014

Differences in lipogenesis and lipolysis in obese and non-obese adult human adipocytes
Provedor de dados: 48
Autores: CIFUENTES,MARIANA; ALBALA,CECILIA; ROJAS,CECILIA V.
It has been proposed that differences in adipocyte function and/or metabolism between obese and lean individuáis may manifest themselves in functional adipose tissue abnormalities that lead to metabolic disorders in obesity. We studied lipogenesis and lipolysis of omental adipocytes from obese (OB) and non-obese (NOB) humans. The specific activity of the lipogenic marker enzyme G3PDH was 50% lower in total adipocytes of OB compared to that of NOB subjects. Omental adipocytes from OB subjects also had lower basal lipolytic levéis, and a lower lipolytic response to p-adrenergic stimulus. Cholesterol depletion of adipocyte plasma membrane using methyl &amp;#946;-cyclodextrin caused a lipolytic effect on adipocytes of both groups together, but when obese and...
Tipo: Journal article
Palavras-chave: Adipocyte; Cholesterol; Lipogenesis; Lipolysis; Obesity; Triglyceride metabolism.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000200009

Differences in the Detoxification Metabolism between Two clonal Lineages of the Aphid Myzus persicae (Sulzer) (Hemiptera: Aphididae) Reared on Tobacco (Nicotiana tabacum L.)
Provedor de dados: 117
Autores: Cabrera-Brandt,Marco A; Fuentes-Contreras,Eduardo; Figueroa,Christian C.
Myzus persicae (Sulzer) is a highly polyphagous aphid species, with a subspecies (M. persicae nicotianae) well adapted to tobacco (Nicotiana tabacum L.). We evaluated the effect of this host plant on the aphid performance and detoxification enzymes, in order to test the participation of xenobiotic metabolism on the ability of this aphid to overcome the tobacco chemical defences. Two genotypes, one corresponding to the only M. persicae nicotianae genotype reported in Chile on tobacco, and one genotype belonging to M. persicae sensu stricto were reared on tobacco and pepper (Capsicum annuum L.), respectively. M. persicae nicotianae showed a significantly higher intrinsic rate of increase (r m) on pepper than on tobacco, and M. persicae s.s. performed...
Tipo: Journal article
Palavras-chave: Detoxification enzymes; Esterases; Glutathione S-transferases; Monooxygenases; Intrinsic rate of increase.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000400006

Differences in the fly-load of Haematobia irritans (Diptera: Muscidae) on cattle is modified by endophyte infection of pastures
Provedor de dados: 69
Autores: Parra,Leonardo; Rojas,Claudio; Catrileo,Adrian; Galdames,Rafael; Mutis,Ana; Birkett,Michael A; Quiroz,Andrés.
Background: The horn fly, Haematobia irritans, is an obligate bloodsucking ectoparasite of pastured cattle and is a major pest of livestock production in North and South America and Europe. In this study, we investigated the potential to use cattle pastures, infected with non-toxic, "friendly" fungal-endophyte-infected (E+) tall fescue, Festuca arundinacea Schreb., as a strategy for reducing horn fly loads in cattle, and to evaluate the possible bioinsecticide effect on horn fly larvae. Results: When cattle grazed in E+ tall fescue, a decrease in fly-load was observed, compared with other pastures (endophyte-free (E-) pastures). The infestation of horn fly load decreased according to an increase in the percentage of endophyte present in the different...
Tipo: Journal article
Palavras-chave: Endophyte-infected tall fescue; Fly-load; Horn fly; Pasture.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500007

Different alternatives for producing sprouts of avocado (Persea americana) rootstocks
Provedor de dados: 118
Autores: Castro,Mónica; Fassio,Claudia; Darrouy,Nicole; Aedo,Marcela; Jorquera,Lorena.
In Chile, most avocado orchards have been planted using 'Hass' as the scion variety on seedling rootstocks. This has led to the presence of a large variety of individuals, some of which show, among other characteristics, high productivity and a low degree of biennial bearing cycle in the same growing conditions. The most common method used in other countries to propagate such rootstocks from trees involves severe topping; however, this technique is notably destructive, making it difficult to employ in commercial orchards. With the goal of developing alternate methods for forcing shoot production from the rootstock, we tested two different procedures in July 2002 and March 2003, respectively: wounding in conjunction with the application of 1.1 M or 2.2 M...
Tipo: Journal article
Palavras-chave: Avocado; Basal sprout; Cloning; Cytokinin; Epicormic sprout; Girdling; Rootstock.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000200007

Different photoprotective responses under drought conditions of two predominant Chilean swamp forest species
Provedor de dados: 73
Autores: Bascuñán-Godoy,Luisa; Alcaíno,Claudia; Carvajal,Danny Eduardo; Sanhueza,Carolina; Montecinos,Sonia; Maldonado,Antonio.
Myrceugenia exsucca (DC.) O.Berg (Myrtaceae) and Luma chequen (Molina) A. Gray (Myrtaceae) are two predominants species from swamp forests of Chile. These species present differential microhabitat distribution across soil moisture and north-south precipitation gradients, with only L. chequen being commonly found in lower moisture sites. It is hypothesized that L. chequen has greater plasticity than M. exsucca in the attributes involved in photoprotection under drought conditions. To test this hypothesis: both species were exposed to short term drought treatment. A group of individuals was maintained irrigated (with &lt;img border=0 width=41 height=36 id="_x0000_i1084" src="http://fbpe/img/gbot/v70n2/art08-for1.jpg"...
Tipo: Journal article
Palavras-chave: Thermal dissipation; Water potential; Native plants; Myrtaceae family; Wetland plants.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200008

Differential effect of manganese on the germination of Triglochin striata (Juncaginaceae) and Cotula coronopifolia (Asteraceae) in Laguna de Carrizal Bajo wetland, Atacama Region, Chile
Provedor de dados: 73
Autores: GUERRERO-LEIVA,NICOLE; ORTIZ-CALDERÓN,CLAUDIA; CASTRO,SERGIO A.
Manganeso es un metal traza cuyos efectos a nivel de semilla no han sido estudiados en profundidad. En el humedal de Carrizal Bajo se han documentado altos niveles de Mn, como aporte combinado de las actividades antrópicas y de la roca madre. En este estudio se evalua experimentalmente el efecto de distintos tratamientos de Mn (0,0; 0,001; 0,1 y 10,0 ppm) sobre la germinación de Triglochin striata y Cotula coronopifolia, dos macrófitas presentes en el humedal. Nuestros resultados mostraron que la germinación de Cotula disminuyó de 60 a 10 % en los tratamientos con Mn, mientras que la germinación de Triglochin se mantuvo en torno al 16 %, sin mostrar diferencias significativas entre los tratamientos. Estos antecedentes sugieren que Mn puede afectar...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100019

Differential Effect of the Route of Inoculation of Rabies Virus on NeuN Immunoreactivity in the Cerebral Cortex of Mice
Provedor de dados: 77
Autores: Rengifo,Aura Caterine; Umbarila,Vanessa Jazmin; Garzón,Mary Janeth; Torres-Fernández,Orlando.
Rabies is a lethal disease caused by a neurotropic virus that produces inconspicuous morphological changes hardly observable with conventional histopathology. The fatal outcome caused by rabies could be attributed to specific biochemical changes that severely impact neuronal function. The neuronal nuclear protein (NeuN) has become a widely used neuronal marker for the research and the histopathological diagnosis of nervous system diseases. To evaluate the distribution of the protein NeuN in the motor cortex of normal and rabies-infected mice adult ICR mice were inoculated with rabies virus either intramuscularly or intracerebrally. Rabies-infected mice were sacrificed at the terminal stage of the disease. Control mice were also euthanized at the same age....
Tipo: Journal article
Palavras-chave: Rabies; NeuN; Cerebral cortex; Mouse; Immunohistochemistry; Neurons.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400031

Differential effects of doxorubicin on atrial natriuretic peptide expression in vivo and in vitro
Provedor de dados: 48
Autores: RAHMAN,ASIM; ALAM,MAHMOOD; RAO,SUDHA; CAI,LIN; LUTHER T.,CLARK; SHAFIQ,SAYID; SIDDIQUI,M.A.Q.
Doxorubicin (Dox) is a potent anti-cancer agent with cardiotoxic side-effects but the mechanism of its cardiotoxicity and its effect on expression of the vasoactive atrial natriuretic peptide (ANP), an important marker for cardiac hypertrophy, are little understood. The present study examined Dox-induced changes in vivo in hearts of 6 mongrel dogs and 5 Sprague-Dawley rats and in vitro in cardiac cultures of neonatal rats. Quantitative RT-PCR analysis using g32-p labeled primers for ß-actin, phospholamban (PLB) and ANP showed a selective 5-fold increase of ANP mRNA in Dox-treated dog hearts in comparison to controls. Similarly, northern analysis of GAPD, ß-actin, cardiac a-actin and ANP gave a selective 4.5-fold increase in ANP transcripts in Dox-treated...
Tipo: Journal article
Palavras-chave: Atrial natriuretic peptide; Gene expression; Adriamycin; Heart failure.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000300007

Differential effects of habitat fragmentation on birds and mammals in Valdivian temperate rainforests
Provedor de dados: 97
Autores: KELT,DOUGLAS A.
Four recent studies on Chilean vertebrates underscore the very different effects that habitat fragmentation may have under different conditions. In southern Chile, birds exhibited significant species-area relationships, whereas the more depauperate small mammal community did not. The avifauna of highly isolated rainforest remnants in Fray Jorge National Park (IV Región) presented steeper species-area relations than those in southern Chile, reminiscent of land-bridge islands after faunal relaxation. The small mammal results were unexpected but may reflect the reduced vagility and immigration potential of this group. Additionally, the inter-remnant matrix habitat may support large populations of only some species, allowing them to capitalize on resources...
Tipo: Journal article
Palavras-chave: Habitat fragmentation; Valdivian temperate rainforest; Small mammals; Birds; Conservation.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400005

Differential expression and localization of ADAM10 and ADAM17 during rat spermatogenesis suggest a role in germ cell differentiation
Provedor de dados: 48
Autores: Urriola-Muñoz,Paulina; Lizama,Carlos; Lagos-Cabré,Raúl; Reyes,Juan G; Moreno,Ricardo D.
BACKGROUND: Extracellular metolloproteases have been implied in different process such as cell death, differentiation and migration. Membrane-bound metalloproteases of the ADAM family shed the extracellular domain of many cytokines and receptor controlling auto and para/juxtacrine cell signaling in different tissues. ADAM17 and ADAM10 are two members of this family surface metalloproteases involved in germ cell apoptosis during the first wave of spermatogenesis in the rat, but they have other signaling functions in somatic tissues. RESULTS: In an attempt to further study these two enzymes, we describe the presence and localization in adult male rats. Results showed that both enzymes are detected in germ and Sertoli cells during all the stages of...
Tipo: Journal article
Palavras-chave: Testis; Spermatogenesis; Apoptosis; Paracrine; Metalloproteinase.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100031

Differential expression of upstream stimulatory factor (USF) 2 variants in eutopic endometria from women with endometriosis: estradiol regulation
Provedor de dados: 48
Autores: Castro,Jazmin; Araya,Germán; Inostroza,Pamela; Hidalgo,Paulina; González-Ramos,Reinaldo; Sovino,Hugo; Angélica Boric,M.; Fuentes,Ariel; Cecilia Johnson,M.
BACKGROUND: Endometriosis, pro-inflammatory and invasive benign disease estrogen dependent, abnormally express in endometria the enzyme P450Arom, positively regulated by steroid factor-1 (SF-1). Our objective was to study the nuclear protein contents of upstream stimulating factor 2 (USF2a and USF2b), a positive regulator of SF-1, throughout the menstrual cycle in eutopic endometria from women with and without (control) endometriosis and the involvement of nuclear estrogen receptors (ER) and G-coupled protein estrogen receptor (GPER)-1 RESULTS: Upstream stimulating factor 2 protein contents were higher in mid (USF2b) and late (USF2a and USF2b) secretory phase in eutopic endometria from endometriosis than control (p &lt; 0.05). In isolated control...
Tipo: Journal article
Palavras-chave: USF2; GPER1; Endometriosis; Eutopic endometrium; Estrogen receptor; Estrogen receptor specific agonists; SF-1; P450Arom.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100056

Differential roles for pathogenicity islands SPI-13 and SPI-8 in the interaction of Salmonella Enteritidis and Salmonella Typhi with murine and human macrophages
Provedor de dados: 48
Autores: Espinoza,Rodrigo A.; Silva&amp;#8209;Valenzuela,Cecilia A.; Amaya,Fernando A.; Urrutia,Ítalo M.; Contreras,Inés; Santiviago,Carlos A.
Abstract  Background Salmonella pathogenicity island (SPI)-13 is conserved in many serovars of S. enterica, including S. Enteritidis, S. Typhimurium and S. Gallinarum. However, it is absent in typhoid serovars such as S. Typhi and Paratyphi A, which carry SPI-8 at the same genomic location. Because the interaction with macrophages is a critical step in Salmonella pathogenicity, in this study we investigated the role played by SPI-13 and SPI-8 in the interaction of S. Enteritidis and S. Typhi with cultured murine (RAW264.7) and human (THP-1) macrophages.  Results  Our results showed that SPI-13 was required for internalization of S. Enteritidis in murine but not human macrophages. On the other hand, SPI-8 was not required for the interaction of S. Typhi...
Tipo: Journal article
Palavras-chave: Salmonella; Enteritidis; Typhi; SPI-13; SPI-8; Macrophages; RAW264.7; THP-1.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100402

Differential Therapeutic Effects of Crataegus aronia and Simvastatin on the Hepatocyte Ultrastructure in Hepatic Steatosis
Provedor de dados: 77
Autores: Al Humayed,Suliman; Eid,Refaat A; Shatoor,Abdullah S; Haidara,Mohamed A; Zaki,Mohamed Samir A; Al-Ani,Bahjat.
Complications of fat accumulation in liver, hepatic steatosis such as liver cirrhosis and liver failure are among the common public health problems. We sought to investigate the damage to the hepatocyte ultrastructure induced by high fat diets (HFD) and compared the therapeutic effects at the cellular level of two antioxidant and lipid lowering agents; Crataegus aronia extracts and simvastatin on hepatic steatosis. Rats were either fed with HFD (model group) or low fat diets (LFD) (control group) for 15 weeks before being sacrificed and therapeutic groups started the treatment with these agents after week 11 until the sacrifice day. Harvested liver tissues were examined using transmission electron microscopy (TEM) and liver homogenates were assayed for...
Tipo: Journal article
Palavras-chave: Hepatic steatosis; Mitochondrial dysfunction; NAFLD; Crataegus aronia; Simvastatin.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200032

Differentiation and characterization of burrows of two species of armadillos in the Brazilian Cerrado
Provedor de dados: 97
Autores: Guilherme Trovati,Roberto.
BACKGROUND: Signs left by some mammals such as tracks, trails, burrows, scratches, feces, hair, and others can be an important tool for species identification. This study was conducted in the Itirapina Ecological Station, in the southern Brazilian Cerrado, whose main objectives were to (1) compare the burrow morphometric variables of Cabassous unicinctus and Euphractus sexcinctus and (2) check for differences in the occurrence of foraging burrows in two different environments: areas with vegetation (shrubby grassland) and areas without vegetation (roads). The collected measures of armadillo's burrows have been width, height, depth, and angle relative to the soil. To record foraging burrows (&lt;70 cm), the linear transect methodology was used...
Tipo: Journal article
Palavras-chave: Burrows; Cabassous unicinctus; Cingulata; Dasypodidae; Euphractus sexcinctus; Xenarthra.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2015000100019

Differentiation of sheep milk and cheese based on quality and composition
Provedor de dados: 118
Autores: Vera,Raúl R; Aguilar,Claudio; Lira,Rodrigo.
Traditional sheep production for meat and wool for meat and wool among small and medium-sized Chilean farmers has low profitability. Therefore, there is interest in producing value-added, differentiated products. One alternative is the production of sheep milk and cheese. This arricie analyzes and discusses existing alternatives for modifying milk and cheese compositions with the aim of differentiating these products. Also, analytical techniques that allowthe chemical characterization of milk and cheese are briefly mentioned. The main international thrusts are focused on the modification of the content and composition of milk fatty acids and on the identification of volatile compounds, terpenes, polyphenols and other analytes that allow differentiation of...
Tipo: Journal article
Palavras-chave: Cheese; Differentiation; Flavor; Milk composition sheep value-added.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300001

Differentiation of Xenarthra (Mammalia) species through the identification of their fecal bile acid patterns: An ecological tool
Provedor de dados: 97
Autores: ARAUJO,M. SOLEDAD; CIUCCIO,MARIANO; CAZON,ADA V; CASANAVE,EMMA B.
The analysis of feces is a fundamental tool for field work, especially to identify the presence of certain species in an area. Fecal bile acids and their relative concentration follow patterns that are species-specific, and can be characterized by Thin Layer Chromatography (TLC). This technique has been used for differentiating feces of several mammal species; however it has never been used for Xenarthra species. In this work, 96 feces of Xenarthra species were analyzed by TLC to determine the bile acid pattern. The species were: Zaedyus pichiy (n = 10), Chaetophractus vellerosus (n = 5), Chaetophractus villosus (n = 57), Dasypus kybridus (n = 4), Priodontes maximus (n = 2), Tamanduá tetradactyla (n = 14) and Myrmecophaga tridactyla (n = 4). There were...
Tipo: Journal article
Palavras-chave: Conservation; Fecal bile acids; TLC; Xenarthra.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000400009

Diffuse Idiopathic Skeletal Hyperostosis of Cervical Column: a Clinical Anatomy and Functional Approach
Provedor de dados: 77
Autores: Perlaza,Néstor Alonso.
Diffuse Idiopathic Skeletal Hyperostosis is a condition of unknown cause, characterized by calcification and ossification of entheseal sites, which generally causes ankylosis of the spinal column and ossification of the extra-spinal ligaments or tendons. The case reported is from the cervical region of the spinal column of skeletal remains. Knowledge of the multiple clinical and functional implications analyzed is of great importance when approaching patients with said manifestations.
Tipo: Journal article
Palavras-chave: DISH; Cervical osteophyte; Ankylosis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200023

Diffusion Signal in Magnetic Resonance Imaging: Origin and Interpretation in Neurosciences
Provedor de dados: 48
Autores: CHABERT,STEREN; SCIFO,PAOLA.
Diffusion Magnetic Resonance Imaging provides images of unquestionable diagnostic value. It is commonly used in the assessment of stroke and in white matter fiber tracking, among other applications. The diffusion coefficient has been shown to depend on cell concentration, membrane permeability, and cell orientation in the case of white matter or muscle fiber tracking; yet a clear relation between diffusion measurements and known physiological parameters is not established. The aim of this paper is to review hypotheses and actual knowledge on diffusion signal origin to provide assistance in the interpretation of diffusion MR images. Focus will be set on brain images, as most common applications of diffusion MRI are found in neuroradiology. Diffusion signal...
Tipo: Journal article
Palavras-chave: Diffusion; Magnetic Resonance Imaging; Interpretation; Non Gaussian.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000500003

Diffusional restrictions in glyoxyl-agarose immobilized penicillin G acylase of different particle size and protein loading
Provedor de dados: 69
Autores: Illanes,Andrés; González,José Miguel; Gómez,José Manuel; Valencia,Pedro; Wilson,Lorena.
Particle size and enzyme protein loading are design parameters of enzyme immobilization affecting biocatalyst performance that can be varied within broad margins. Their effect on mass transfer limitations at different bulk penicillin G concentrations has been studied with glyoxyl agarose immobilized penicillin G acylase biocatalysts of average particle size of 5·10-5m and 10·10-4m at protein loadings from 15 to 130 mg/g gel. Internal diffusional restrictions were evaluated for such biocatalysts: Thiele modulus varied from 1.17 for the small particles at the lower protein load to 5.84 for the large particles at the higher protein load. Effectiveness factors at different bulk substrate concentrations were determined for all biocatalysts, values ranging from...
Tipo: Journal article
Palavras-chave: Diffusional restrictions; Enzyme kinetics; Immobilized enzyme; Penicillin G acylase; Penicillin hydrolysis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100002

Digestión de láminas foliares de Bromus auleticus Trin. ex Nees sometidas a diferentes tiempos de incubación ruminal
Provedor de dados: 113
Autores: Gasser,Milagros; Ramos,Julio; Vegetti,Abelardo; Tivano,Juan Carlos.
La disminución de la digestibilidad en los forrajes está asociada al incremento de la pared celular y lignificación de los tejidos a medida que maduran. Todos los forrajes están compuestos de un conjunto heterogéneo de tipos celulares con características únicas que determinan la disponibilidad de los polisacáridos a los microorganismos del rumen. Este trabajo estudió la degradación de los tejidos foliares de cebadilla chaqueña (Bromus auleticus Trin. ex Nees) a diferentes tiempos de incubación ruminal. Se tomaron muestras de láminas foliares en dos estados fenológicos: vegetativo y prefloración, las cuales fueron sometidas a diferentes tiempos de digestión in situ en dos vacas Holando Argentino secas. Paralelamente secciones de láminas foliares fueron...
Tipo: Journal article
Palavras-chave: Anatomía foliar; Lignina; Xilema; Esclerénquima; Digestibilidad.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100005

Digestive Peritoneum in Wistar Rat (Rattus norvegicus)
Provedor de dados: 77
Autores: Möller,Richard; Vazquez,Noelia; Teliz,Diana; Méndez,Virginia.
The laboratory rat (Rattus norvegicus albinus) has been used as a model for medical, biological and molecular research, for a long time. It is an interesting fact that there are no detailed descriptions of the gross anatomy of the liver and its ways of fixation. The aim of this study is to define clearly and according to the Nomina Anatomica Veterinaria principles, the liver and its way of fixation in this species of laboratory mammal. Eighty-eight rats (Rattus norvegicus albinus) were used, with a weight between 250 and 450 g. They were dissected in fresh, after been euthanized by an overdose of thiopental sodium intraperitoneal. An incision from the xiphoid cartilage up to the pubic region was made and another on each costal arch toward dorsal.
Tipo: Journal article
Palavras-chave: Anatomy; Morphology; Mammals; Rattus norvegicus.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100020

Digestive Phenotypic Flexibility in Post-Metamorphic Amphibians: Studies on a Model Organism
Provedor de dados: 48
Autores: NAYA,DANIEL E; BOZINOVIC,FRANCISCO.
Studies of phenotypic flexibility are central to the understanding of evolutionary and comparative physiology. Research conducted on many vertebrate species has shown that the digestive system is highly responsive and sensitive to environmental cues. However, amphibians, which are a standard and classic model organism for the study of many physiological processes, have been poorly considered in the study of ecological consequences on digestive flexibility. Here we review and analyze the current information on this topic for amphibians. We identify three major bodies of empirical evidence: a) seasonal changes in gut development, b) lack of dietary modulation of gut attributes in adult individuals, c) a relationship between feeding habits and the magnitude...
Tipo: Journal article
Palavras-chave: Amphibians; Digestive theory; Gut adjustments; Phenotypic flexibility.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000300002

DIGITAL MAPPING OF FARMLAND CLASSES IN THREE LANDSCAPE IN MEXICO
Provedor de dados: 126
Autores: Cruz-Cárdenas,G; Ortiz-Solorio,C.A; Ojeda-Trejo,E; Martinez-Montoya,J.F; Sotelo-Ruiz,E.D; Licona-Vargas,A.L.
The cartography of farmland classes allows generating land maps, using a methodology based on local knowledge, rapidly and at low cost, and with a greater number of cartographic units than conventional soil surveys maps. However, the results found when producing these maps with automated cartography techniques are contrasting. Precision and accuracy were evaluated in 324 computer generated farmland class (FLC) maps by applying the Inverse Distance Weighted (IDW) interpolation model. These maps were obtained by varying the sample size for the training, its spatial design, and the Power value of the interpolator. Moreover, the effort needed to obtain maps with acceptable reliability was quantified. The procedure was applied to FLC maps obtained from surveys...
Tipo: Journal article
Palavras-chave: Map accuracy; IDW interpolator; Soil sampling strategies.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000200003

Dimensión Vertical de la Región Anterior de la Mandíbula
Provedor de dados: 77
Autores: Bolini,Paulo Domingos André; Gaspar,Ana Maria Minarelli; de Souza,Juliana Feltrin.
Realizamos mediciones de la región de la sínfisis mentoniana, en 308 mandíbulas secas: 247 pertenecientes a la colección del museo de cráneos de disciplina de Anatomía de la UNIFESP- Escuela Paulista de Medicina- EPM y 61 pertenecientes al laboratorio didáctico de la disciplina de Anatomía de la Facultad de Odontología de Araraquara- UNESP. En las mandíbulas dentadas, el mayor valor encontrado fue de 43,46 mm y el menor de 22,67 mm. En las mandíbulas desdentadas, el mayor valor encontrado fue de 37,24 mm y el menor de 6,22 mm.Esperamos poder contribuir para el mejor conocimiento de la región de la sínfisis mentoniana, tanto para los profesionales de las áreas de Cirugía e Implantología, como para los industriales de áreas afines, para la confección de...
Tipo: Journal article
Palavras-chave: Anatomía; Mandíbula; Sínfisis mentoniana.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500002

Dimensión Vertical en Edentados: Relación con Síntomas Referidos
Provedor de dados: 77
Autores: Ramirez,L. M; Echeverría,P; Zea,F. J; Ballesteros,L. E.
La dimensión vertical es una medida aproximada de las relaciones fisiológicas intermaxilares. Su obtención es un proceso sensible y metódico que produce efectos craneofaciales colaterales cuando es erróneamente lograda. Los conceptos individualistas de su obtención deben ser cambiados e interiorizados de una manera colectiva debido a la complejidad de la dinámica masticatoria que exige una perspectiva más amplia de esta noción. La correspondencia entre la dimensión vertical y lo funcional-disfuncional cráneo-cervical es innegable y va mas allá de una relación exclusivamente dental. Esta revisión busca situar al lector en una realidad estomatognática y no solo odontológica, que exige mayores esfuerzos y un cambio de perspectiva en la conceptualización de la...
Tipo: Journal article
Palavras-chave: Dimensión vertical; Síntomas referidos; Tinitus; Vértigo; Otalgia; Cefalea; Hipoacusia.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200054

Dimensional analysis revisited
Provedor de dados: 48
Autores: GÜNTHER,BRUNO; MORGADO,ENRIQUE.
The applicability of dimensional analysis (DA) is discussed in relation to the metabolic scaling laws. The evolution of different theories of biological similarity has shown that the calculated reduced exponents (b) of Huxley's allometric equation are closely correlated with the numerical values obtained from the statistical analysis of empirical data. Body mass and body weight are not equivalent as biological reference systems, since in accordance to Newton's second law, the former has a dimension of a mass, while the latter should be dimensionally considered as a force (W = MLT-2). This distinction affects the coefficients of the mass exponent (a). This difference is of paramount importance in microgravity conditions (spaceflight) and of buoyancy during...
Tipo: Journal article
Palavras-chave: Dimensional analysis; Allometric scaling; Theories of biological similarity; Body mass; Body weight.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000300011

Dimorfismo sexual de Aspidoscelis costata costata (Squamata: Teiidae) en el sur del Estado de México, México
Provedor de dados: 97
Autores: AGUILAR-MORENO,MAGDALENA; RODRÍGUEZ-ROMERO,FELIPE DE J; ARAGÓN-MARTÍNEZ,ANDRÉS; MUÑOZ-MANZANO,JOSÉ A; GRANADOS-GONZÁLEZ,GISELA; HERNÁNDEZ-GALLEGOS,OSWALDO.
El dimorfismo sexual es una característica extendida en lacertilios y se relaciona con la adecuación de los individuos. En este estudio se analizó si Aspidoscelis costata costata (Squamata) presenta dimorfismo sexual al sur del Estado de México, México, especialmente en relación a su forma corporal altamente conservada dentro de la familia Teiidae. La población estudiada habita a 1500 msnm. Se utilizaron individuos adultos que fueron capturados y liberados durante estudios ecológicos. Para cada individuo se registró la longitud hocico-cloaca, el peso corporal, largo de la cabeza, ancho de la cabeza, alto de la cabeza, longitud del fémur y distancia interaxilar. Los análisis realizados indicaron que los machos fueron más grandes en longitud hocico-cloaca y...
Tipo: Journal article
Palavras-chave: Reptiles; Selección por fecundidad; Selección sexual.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000400011

Dimorfismo sexual en el acebo, Ilex aquifolium: ¿coste de la reproducción, selección sexual o diferenciación fisiológica?
Provedor de dados: 97
Autores: OBESO,JOSÉ RAMÓN; RETUERTO,RUBÉN.
Se examina la importancia de tres hipótesis que pueden explicar la existencia de dimorfismo sexual en caracteres secundarios (tamaño) en árbol dioico Ilex aquifolium (Aquifoliaceae): coste de la reproducción, competencia entre machos y diferenciación fisiológica entre sexos. Para ello se presenta una síntesis de trabajos publicados junto con nuevos resultados de tipo observacional y experimental. Durante la floración los machos invirtieron el triple de carbono y el doble de nitrógeno que las hembras. En la fructificación, los árboles hembras invirtieron 10 veces más que los machos en carbono, pero sólo cinco veces más en nitrógeno. No se encontraron diferencias entre sexos en la dinámica foliar y las diferencias en el crecimiento de las ramas fueron...
Tipo: Journal article
Palavras-chave: Anillos de crecimiento; Inversión en reproducción; Efectos maternos; Competencia entre machos; Eficiencia de la fotosíntesis; Discriminación isotópica de carbono; Tasa relativa de crecimiento.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100007

Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, México
Provedor de dados: 97
Autores: RAMÍREZ-BAUTISTA,AURELIO; PAVÓN,NUMA P.
It is well known that geographic variation oceurs in life history characteristics among populations of lizards. Variations in life histories found in some studies are possibly adaptations to environmental pressures. In southwestern México, the reproductive characteristics of the endemic species Sceloporus formosus have been poorly studied throughout its geographic range. We used specimens from scientific collections to describe male and female reproductive eyeles and sexual dimorphism of S. formosus. Other viviparous Sceloporus from high elevations show sexual dimorphism, with males being larger in many morphological characteristics than females. We therefore expected that S. formosus would show sexual dimorphism. However, we found no sexual dimorphism....
Tipo: Journal article
Palavras-chave: Litter size; Reproductive eyeles; Reproductive strategy; Tropical lizards.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400009

Dimorfismo sexual y morfología funcional de las extremidades de Loxosceles laeta (Nicolet, 1849)
Provedor de dados: 72
Autores: Canals,Mauricio; Taucare-Rios,Andrés; Solis,Rigoberto; Moreno,Lucila.
RESUMEN Las relaciones alométricas entre rasgos morfológicos aportan evidencia de las fuerzas evolutivas que actúan sobre un rasgo particular. Las arañas que viven a ras de suelo son menos dimórficas que las que construyen telas, lo que ha sido atribuido a sus diferentes estrategias reproductivas y de forrajeo. Se ha propuesto que las largas extremidades en machos con respecto a la masa conducen a una optimización de los costos de locomoción. El objetivo de este estudio fué caracterizar la variabilidad de las dimensiones de las extremidades en la araña del rincón Loxosceles laeta y comparar las relaciones alométricas de las extremidades locomotoras entre ambos sexos. Tanto machos como hembras mostraron una alometría negativa de las extremidades, es decir...
Tipo: Journal article
Palavras-chave: Loxosceles; Dimorfismo sexual; Alometría; Extremidades.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200161

Dinámica de Acumulación de Láminas Foliares y Estructura del Forraje Diferido de Panicum coloratum L.
Provedor de dados: 113
Autores: M Ferri,Carlos; Brizuela,Miguel A; Cid,M Silvia; Stritzler,Néstor P.
Los objetivos fueron caracterizar la estructura de una pastura de Panicum coloratum L. cv. Verde, resultante de diferentes duraciones del período de acumulación de forraje, analizar si las tasas de acumulación de lámina son constantes en el tiempo, y determinar la variable de mayor ajuste (tiempo cronológico o térmico) para predecir dicho proceso. Los tratamientos se establecieron difiriendo el forraje producido hasta el cese del crecimiento, luego de cortes realizados a mediados de diciembre (T215), principios de enero (T190) y de febrero (T160), y se asignaron al azar en parcelas de 0,5 ha con dos repeticiones. La duración del período de diferimiento, o rezago, no afectó (P &gt; 0,05) la densidad de macollos totales. El número de macollos en estado...
Tipo: Journal article
Palavras-chave: Gramínea C4; Forraje diferido; Forraje rezagado; Tiempo térmico.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000400006

DINAMICA DE COMUNIDADES HIDROFILAS ASOCIADAS A CANALES DE RIEGO EN EL ALTO VALLE DE RIO NEGRO (ARGENTINA)
Provedor de dados: 73
Autores: Conticello,Luisa; Cerazo,Beatriz; Bustamante,Adriana.
El objetivo del presente trabajo es conocer la composición florística de la vegetación hidrófila localizada en áreas adyacentes a canales de riego y drenaje en el Alto Valle de Río Negro, y su dinámica con relación a fluctuaciones en el nivel de agua. La vegetación fue muestreada siguiendo la metodología de Braun Blanquet y a partir de esta información se determinó que las comunidades presentes en estas zonas pertenecen mayoritariamente a las clases Phragmito-Magnocaricetea y Salicornietea ambiguae. En primavera-verano (época de riego), el nivel de agua alcanza su punto máximo y se producen los típicos anegamientos que favorecen el desarrollo de juncales de Scirpus californicus. Cuando el nivel de agua desciende, con el consecuente aumento de la salinidad,...
Tipo: Journal article
Palavras-chave: Vegetación hidrófila; Dinámica; Fitosociología.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100003

DINÁMICA DEL NITRÓGENO BAJO DIFERENTES ROTACIONES, SISTEMAS DE LABRANZA Y MANEJO DE RESIDUOS EN EL CULTIVO DE TRIGO
Provedor de dados: 113
Autores: Vidal,Iván; Etchevers,Jorge; Fischer,Anthony.
Se cuantificó el comportamiento del trigo (Triticum aestivum) en distintas rotaciones, sistemas de labranza y manejo de residuos y, se midió la mineralización y absorción de nitrógeno (N) bajo estas diferentes condiciones de manejo, empleando microlisímetros enterrados en el suelo. Después de tres años de establecer ciertos tratamientos tendientes a hacer más sustentable el sistema de producción de trigo en una zona con régimen de lluvias de verano, la incorporación de una leguminosa en la rotación se tradujo, por lo general, en mayores rendimientos y mejor abastecimiento de N para la planta. Esto fue explicado por la ocurrencia de una mayor mineralización del N en el suelo, tanto durante el período de crecimiento del cultivo como por la presencia de más N...
Tipo: Journal article
Palavras-chave: Mineralización; Cero labranza; Sistema de cultivo.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100012

Dinámica espacio-temporal de 13 especies de peces nativos en un ecotono lacustre-fluvial de la Cuenca del Río Valdivia (Chile)
Provedor de dados: 72
Autores: Valdovinos,Claudio; Habit,Evelyn; Jara,Alfonso; Piedra,Priscila; González,Jorge; Salvo,Jacqueline.
Los ecotonos transicionales entre lagos y ríos han recibido menor atención que aquellos de ecosistemas terrestres, y pueden reunir características particulares de gran importancia para la conservación de la biodiversidad dulceacuícola. Con el objeto de evaluar lo anterior, se estudió la dinámica espacio-temporal de las abundancias y tallas, de poblaciones de 13 especies de peces nativos chilenos, presentes en la zona ecotonal Lago Riñihue - Río San Pedro, ubicada en la cuenca hidrográfica del río Valdivia (Chile). Se muestrearon mensualmente 35 sitios localizados en tres zonas hidromorfológicas del área de estudio (número de sitios por zona: Ml = 9, M2= 17, M3= 9). Los muestreos se llevaron a cabo el año 2006. De manera complementaria, se realizaron...
Tipo: Journal article
Palavras-chave: Biodiversidad; Ecotonos; Ecología; Ictiofauna; Río San Pedro; Chile.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100005

DINÁMICA NUTRICIONAL EN CINCO PARRONES DE DIFERENTE PRODUCTIVIDAD DEL VALLE CENTRAL REGADO DE CHILE
Provedor de dados: 113
Autores: Ruiz S.,Rafael.
Se efectuó un estudio comparativo de aspectos nutricionales del suelo y de la planta en 5 parronales de uva de mesa cv. Thompson Seedless con un historial muy diferente de productividad y vigor, en el valle central de Chile, durante 4 años. Durante este período se efectuaron análisis nutricionales mensuales, que incluyeron además de N, P y K total, fracciones de N de reserva como arginina y aminoácidos totales y carbohidratos de reserva en la parte aérea (sarmientos y brotes) y en raíces. El análisis al final del período indica relaciones consistentes entre la fertilidad del perfil de suelo, las características físicas intrínsecas del suelo, la calidad del sistema radicular y los niveles nutricionales en raíces y parte aérea con el vigor-productividad de...
Tipo: Journal article
Palavras-chave: Uva de mesa; Nutrición; Reservas nutricionales; Extracción de nutrientes.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000400007

Dining out: Bryconops caudomaculatus jumps out of water to catch flies
Provedor de dados: 97
Autores: COSTA-PEREIRA,RAUL; SEVERO-NETO,FRANCISCO.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000200012

DIPLODON CHILENSIS gray, 1828 (BIVALVIA: HYRIIDAE) A POTENTIAL RESIDUAL WATERS DEPURATOR ON INLAND WATER SALMONID FISH-FARMS: A LABORATORY SCALE STUDY
Provedor de dados: 72
Autores: Parada,Esperanza; Peredo,Santiago; Cárdenas,Silvia; Valdebenito,Iván; Peredo,Matías.
The aim of the present study was to experimentaly evaluate the capability of the freshwater mussel Diplodon chilensis as a potential depurator of residual waters in fish farming. With this purpose, the present study was carried out at the fish farm of the School of Aquaculture of the Catholic University- Temuco, Chile (38º46'S; 72º38'W). The experimental design consisted of 12 poly vinyl chloride trays of 50x20x20cm corresponding to 3 treatments with 3 replicates each treatment and their respective controls. Each tray contained sterilized sand substratum and running water from a trout feeding tank. The treatments 1, 2, 3 contained 15, 30 and 60 mussels respectively, while the control trays contained no mussels. The growth tank contained 5,2k/m³ of...
Tipo: Journal article
Palavras-chave: Hyriidae; Freshwater mussel; Diplodon chilensis; Residual waters depuration; Rural salmonid fish-farms.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100009

DIPLODON PATAGONICUS (BIVALVIA: HYRIIDAE): TO BE OR NOT TO BE
Provedor de dados: 72
Autores: Parada,Esperanza; Peredo,Santiago.
Se entregan antecedentes que establecen que Diplodon patagonicus (D'Orbigny 1835) señalado como especie presente en la región Neo tropica-Patagonia por Graf &amp;amp; Cummins (2007) corresponde aDiplodon chilensis patagonicus (D'Orbigny 1846) (sensu Haas 1969).
Tipo: Journal article
Palavras-chave: Diplodon chilensis patagonicus; Almeja de agua dulce; Taxonomía; Región Neo tropica-Patagonia.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200014

Direcciones futuras de la ecotoxicología en Chile: implicancias para la evaluación de riesgo ambiental de productos veterinarios utilizados en acuicultura
Provedor de dados: 97
Autores: MEDINA,MATÍAS H; RAMOS-JILIBERTO,RODRIGO.
La relación bidireccional de influencia que la acuicultura establece con el ambiente en el cual se desarrolla determina límites al crecimiento de esta actividad económica en Chile. Esto se ha traducido tanto en restricciones técnicas, como en conflictos ambientales y sociales. La creciente demanda de nuevos productos quimioterapéuticos y su consecuente vertido en ambientes acuáticos es considerado uno de los principales problemas ambientales que enfrenta la industria del salmón en Chile. Sin embargo, poco se sabe acerca de los efectos que ejercen estas sustancias sobre especies no objetivo y, en general, sobre la estructura y función de los ecosistemas expuestos. Mediante la aplicación de teoría y métodos de ecología contemporánea, el trabajo aquí...
Tipo: Journal article
Palavras-chave: Ecología aplicada; Gestión ambiental; Mesocosmos; Microcosmos; Sistemas complejos.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300010

Directional orientation of reproductive tissue of Eulychnia breviflora (Cactaceae) in the hyperarid Atacama Desert
Provedor de dados: 97
Autores: Warren,Steven D.; Aguilera,Lorgio E.; Scott Baggett,L.
BACKGROUND: Many barrel or columnar cacti, including some in the Atacama Desert, produce their reproductive tissue at or near the terminal apices of solitary or minimally branched stems that lean toward the equator, reportedly to maximize exposure to photosynthetically active radiation (PAR). Those with lateral reproductive tissue, often produce the tissue on the equatorial side of the stems. An examination of the multi-stemmed, arbuscular cactus, Eulychnia breviflora, was made to determine if it follows the same general strategy. METHODS: Individuals of the species were evaluated along a 100 km transect in the Atacama Desert. The position of all floral buds and open flowers was documented relative to the center of the plants and relative to the center of...
Tipo: Journal article
Palavras-chave: Eulychnia breviflora; Energetic efficiency; Equatorial orientation; Flowers; Photosynthetically active radiation (PAR).
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100010

Discovering Craniofacial Patterns Using Multivariate Cephalometric Data for Treatment Decision Making in Orthodontics
Provedor de dados: 77
Autores: Araya-Díaz,Pamela; Ruz,Gonzalo A; Palomino,Hernán M.
The aim was to find craniofacial morphology patterns in a multivariate cephalometric database using a clustering technique. Cephalometric analysis was performed in a sample of 100 teleradiographs collected from Chilean orthodontic patients. Thirty cephalometric measurements were taken from commonly used analysis. The computed variables were used to perform a clustering analysis with the k-means algorithm to identify patterns of craniofacial morphology. The J48 decision tree was used to analyze each cluster, and the ANOVA test to determine the statistical differences between the clusters. Four clusters were found that had significant differences (P&lt;0.001) in 24 of the 30 variables studied, suggesting that they represent different patterns of craniofacial...
Tipo: Journal article
Palavras-chave: Craniofacial patterns; Morphological patterns; Clustering technique; Orthodontics.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300053

DISCOVERY OF THE PATAGONIAN SPECIES RANUNCULUS FUEGIANUS SPEG. (RANUNCULACEAE) IN THE ALTIPLANO PEATLANDS OF NORTHERN ARGENTINA AND ITS LECTOTYPIFICATION
Provedor de dados: 73
Autores: Lehnebach,Carlos A; Schittek,Karsten; Iharlegui,Laura.
Ranunculus fuegianus es una especie sudamericana comúnmente considerada como endémica de la Patagoma y Tierra del Fuego. En recientes excursiones al norte de Argentina se han descubierto dos poblaciones de R. fuegianus en las localidades andinas Abra del Gallo e Incachule (Provincia de Salta, 24°S). Con este registro se extiende el límite norte de distribución de esta especie en Argentina en más de 2.500 km. Se propone, además, la lectotipificación de R. fuegianus con material original depositado en el herbario LP.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200015

Discrepancy variation of dinucleotide microsatellite repeats in eukaryotic genomes
Provedor de dados: 48
Autores: GAO,HUAN; CAI,SHENGLI; YAN,BINLUN; CHEN,BAIYAO; YU,FEI.
To address whether there are differences of variation among repeat motif types and among taxonomic groups, we present here an analysis of variation and correlation of dinucleotide microsatellite repeats in eukaryotic genomes. Ten taxonomic groups were compared, those being primates, mammalia (excluding primates and rodentia), rodentia, birds, fish, amphibians and reptiles, insects, molluscs, plants and fungi, respectively. The data used in the analysis is from the literature published in the Journal of Molecular Ecology Notes. Analysis of variation reveals that there are no significant differences between AC and AG repeat motif types. Moreover, the number of alleles correlates positively with the copy number in both AG and AC repeats. Similar conclusions...
Tipo: Journal article
Palavras-chave: Microsatellites; Eukaryotic genomes; Variation of SSR; Copy number; Meta-analysis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300011

Discrete observations of the spatial distributions of the Helix aspersa snail in an outdoor system
Provedor de dados: 118
Autores: González,Olga; Pérez Camargo,Gladys; Membiela,Macarena; Frezza,Diana; Bartoloni,Norberto; Vieites,Carlos.
In this study, adult Helix apersa land snails with previously established periodicity were observed at three densities in their finishing stage in order to contribute to the body of knowledge about spatial distribution and certain behavior patterns in an outdoor system. From November 8 to December 18, 2006, snails that were in their final fattening phase were grouped at three densities (50 snail·m-2, 100 snail·m-2, 200 snail·m-2) and randomly placed in nine cubicles, with three replicates of each density. Twelve observations of the snail behavior were made between 12 am and 1 pm. The categories selected as "discrete acts" include: observing the snails in the shelters, on Swiss chard leaves (Beta vulgaris), adhered to the netting, on the balanced feed, on...
Tipo: Journal article
Palavras-chave: Helix aspersa; Heliciculture; Snails; Spatial distribution.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000100012

Discriminación de Sexo en una Población Medieval del Sur de la Península Ibérica Mediante el Uso de Variables Simples
Provedor de dados: 77
Autores: Jiménez-Arenas,Juan Manuel.
Las asignaciones de sexo a los restos osteológicos es fundamental puesto que suponen el primer paso hacia el establecimiento de otros tipos de inferencias biológicas y culturales. Aunque la determinación del sexo es relativamente fácil cuando se recuperan determinadas partes esqueléticas, especialmente la pelvis y el cráneo, resulta más problemática a partir de otros huesos, sobre todo si se trata de fragmentos. En este trabajo se presenta un estudio de discriminación del sexo de los individuos a partir del húmero utilizando variables simples. Los resultados muestran cómo, utilizando la prueba de Lubischew, cada una de las principales partes del húmero aporta, al menos, una variable con porcentajes de discriminación cercanos al 90%. Estos resultados se...
Tipo: Journal article
Palavras-chave: Discriminación del Sexo; Edad Media; Húmero; Prueba de Lubischew; Análisis discriminante.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300003

Discriminación entre Atletas y No Atletas Basada en la Estructura Latente de Algunas Variables Biométricas
Provedor de dados: 77
Autores: Rexhepi,Agron M; Brestovci,Behlul.
El objetivo de este estudio exploratorio fue determinar el impacto de las actividades físicas organizadas sobre la estructura latente de algunas variables morfo-funcionales. Se estudiaron y discriminaron entre un grupo de atletas (167 sujetos, edad promedio 22,4 años) y no atletas (150 sujetos, edad promedio 25,7 años) la estructura latente de 12 variables morfométricas, 4 variables fisiológicas y 7 variables hematológicas. Las diferencias significativas entre los atletas y no atletas en cuatro factores latentes se estudiaron mediante análisis discriminantes canónicos. Las diferencias significativas entre los dos grupos demuestran el impacto de las actividades físicas regulares y bien organizadas sobre las características morfométricas, capacidades...
Tipo: Journal article
Palavras-chave: Análisis discriminantes canónicos; Factores latentes; Variables morfofuncionales.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300030

Discrimination of bile acids by the rainbow trout olfactory system: Evidence as potential pheromone
Provedor de dados: 48
Autores: GIAQUINTO,PERCILIA C; HARA,TOSHIAKI J.
Electro-olfactogram recording was used to determine whether the olfactory epithelium of adult rainbow trout is specifically sensitive to bile acids, some of which have been hypothesized to function as pheromones. Of 38 bile acids that had been pre-screened for olfactory activity, 6 were selected. The rainbow trout-specific bile acids, taurocholic acid (TCA), and taurolithocholic acid 3-sulfate (TLS) were the most potent compounds tested. TLS had a distinctive dose-response curve. Cross-adaptation experiments demonstrated that sensitivity to bile acids is attributable to at least 3 independent classes of olfactory receptor sites. Our data suggest that bile acids are discriminated by olfaction in rainbow trout, supporting the possibility that these compounds...
Tipo: Journal article
Palavras-chave: Bile acids; Chemical signals; Electro-olfactogram; Olfaction; Pheromones; Rainbow trout.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000100005

Discrimination of Different Body Structure Indexes of Elite Athletes in Combat Sports Measured by Multi Frequency Bioimpedance Method
Provedor de dados: 77
Autores: Dopsaj,Milivoj; Markovic,Milan; Kasum,Goran; Jovanovic,Srecko; Koropanovski,Nenad; Vukovic,Marko; Mudric,Milos.
In order to achieve high results in sports, it is necessary to provide an adequate status of an athlete in according to various factors, among which the body structure is one of greater importance. The aim of this research is to define the most discriminated indicators of body structure indexes, thanks to which a specific change of physical structure can be observed according to a branch of sport and type of combat sport. Variables in the research were: body height, body mass, body mass index, free fat mass index, fat mass index, protein mass index, skeletal muscle mass index, percent of body fat, percent of skeletal muscle mass and protein fat index. The measuring of the body composition is realized by using multichannel segmental bioimpedance with InBody...
Tipo: Journal article
Palavras-chave: Combat sports; Elite athletes; Body structure; Bioimpedance.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100033

Discrimination of population of recombinant inbred lines of rye (Secale cereale L.) for different responses to nitrogen-potassium stress assessed at the seedling stage under in vitro conditions
Provedor de dados: 69
Autores: Smolik,Mi&amp;#322;osz.
Background: Plants differ in the methods used to acquire nutrients from environments with low nutrient availability, and may change the morphology of their ‘root architecture’ to be able to take up nutrients. Results: In the present study rye response to stress caused by high and low nitrogen-potassium treatments in mature embryos cultures was described within a population consisting of one hundred and thirty eight recombinant inbred lines of rye. Characterization of the response of recombinant inbred lines (RILs) to nutrient stress was presented as the results of analyses of morphological traits, and physiological and biochemical parameters of the seedlings grown in both treatments. A wide range of variability of individual RILs to induced stress was...
Tipo: Journal article
Palavras-chave: Mature embryos; Nutrient stress; Oxidative stress; RILs; Rye.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000100005

Discurso Chile-CIENCIA 2000
Provedor de dados: 48
Autores: GOLES CHACC,ERIC.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000100002

Discurso de Agradecimiento del Profesor Dr. Alberto Rodríguez Torres, al Nombramiento como Maestro de la Anatomía de Chile
Provedor de dados: 77
Autores: Rodríguez Torres,Alberto.
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000100008

Disease association and inter-connectivity analysis of human brain specific co-expressed functional modules
Provedor de dados: 48
Autores: Oh,Kimin; Hwang,Taeho; Cha,Kihoon; Yi,Gwan-Su.
BACKGROUND: In the recent studies, it is suggested that the analysis of transcriptomic change of functional modules instead of individual genes would be more effective for system-wide identification of cellular functions. This could also provide a new possibility for the better understanding of difference between human and chimpanzee RESULTS: In this study, we analyzed to find molecular characteristics of human brain functions from the difference of transcriptome between human and chimpanzee's brain using the functional module-centric co-expression analysis. We performed analysis of brain disease association and systems-level connectivity of species-specific co-expressed functional modules CONCLUSIONS: Throughout the analyses, we found human-specific...
Tipo: Journal article
Palavras-chave: Co-expressed functional module; Disease association; Inter-connectivity analysis.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100067

DISEMINACIÓN NATURAL DEL VIRUS CAUSANTE DE LA ENFERMEDAD DE SHARKA (Plum pox virus, PPV) EN TRES TEMPORADAS EN UN HUERTO DE DAMASCO
Provedor de dados: 113
Autores: Herrera M.,Guido; Madariaga V.,Mónica.
La diseminación de Plum pox virus (PPV) fue estudiada en un huerto de damascos (Prunus armeniaca L.) establecido en 1995 con material sano en la Región Metropolitana de Chile. El huerto fue establecido en un área con una alta presión de inóculo con tres cultivares: Dina, Castelbrite y Katy. La evaluación de los árboles se realizó cada año mediante la observación de síntomas y el uso de antisueros policlonales para PPV. La raza presente en el huerto fue del tipo D (Dideron). La diseminación de PPV en los años 1999, 2000 y 2001 fue 6,6; 14,1 y 26,7%; 0; 0,6 y 3,3%; 0; 0,5 y 2,1% para los cvs. Dina, Castelbrite y Katy, respectivamente.
Tipo: Journal article
Palavras-chave: Epidemiología; Prunus armeniaca L.; Enfermedad de Sharka.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000200009

Diseños de Aprendizaje Basados en las TIC (Moodle 2.0 y Mahara) para Contenidos de Anatomía, Fisiología y Salud en las Clases de Educación Física Escolar
Provedor de dados: 77
Autores: Granero-Gallegos,Antonio; Baena-Extremera,Antonio.
El objetivo fue comparar el rendimiento en el aprendizaje de alumnado de secundaria en clase de Educación Física tras recibir dos unidades didácticas en las que la formación teórica de los contenidos de Anatomía, Fisiología y Salud Corporal, fue impartida con el apoyo de Moodle 2.0 y Mahara. Se utilizó un diseño cuasi-experimental, descriptivo y seccional. La muestra total se compuso por 122 alumnos de 4 de Enseñanza Secundaria Obligatoria (ESO), 57 varones y 65 mujeres. Se trabajó con un grupo experimental de 72 personas que recibieron la formación teórica de dos unidades didácticas con apoyo de Moodle 2.0 y Mahara, y otro grupo control de 50 alumnos que recibió las clases sin apoyo de plataformas virtuales. Las clases prácticas fueron igual en ambos...
Tipo: Journal article
Palavras-chave: Metodología; Moodle 2.0; Mahara; Anatomía; Fisiología; Educación Física.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100059

Disentangling the dynamic core: a research program for a neurodynamics at the large-scale
Provedor de dados: 48
Autores: LE VAN QUYEN,MICHEL.
My purpose in this paper is to sketch a research direction based on Francisco Varela's pioneering work in neurodynamics (see also Rudrauf et al. 2003, in this issue). Very early on he argued that the internal coherence of every mental-cognitive state lies in the global self-organization of the brain activities at the large-scale, constituting a fundamental pole of integration called here a "dynamic core". Recent neuroimaging evidence appears to broadly support this hypothesis and suggests that a global brain dynamics emerges at the large scale level from the cooperative interactions among widely distributed neuronal populations. Despite a growing body of evidence supporting this view, our understanding of these large-scale brain processes remains hampered...
Tipo: Journal article
Palavras-chave: Nonlinear dynamics; Phase synchronization; Chaos; EEG; Non-gaussian statistics.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000100006

Disjoint geographical distribution of intertidal and nearshore benthic invertebrates in the Southern Hemisphere
Provedor de dados: 97
Autores: CASTILLA,JUAN C; GUIÑEZ,RICARDO.
Biogeographical explanations for the extant and paleo disjoint geographical distribution in the southern hemisphere of five species of nearshore marine benthic invertebrates: Gaimardia trapesina, Ostrea chilensis, Pyura stolonifera taxonomic complex, Aulacomya ater and Concholepas concholepas, showing distinctive reproductive strategies and early life history characteristics are reviewed and analyzed. Through the use of published and new information we contrasted the following hypotheses: a) vicariance-historical process, b) epiplanktonic larval dispersal, c) juvenile/adult dispersal through rafting and d) planned or accidental anthropogenic dispersal mechanisms. The juvenile/adult transoceanic dispersal hypothesis by rafting was the only one impossible to...
Tipo: Journal article
Palavras-chave: Paleobiogeography; Vicariance; Larval dispersal; Rafting; Anthropogenic dispersal; Bivalves; Gastropods; Tunicates; Invertebrates; Nearshore; Southern hemisphere.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400004

Dismetría Pélvica en una Muestra Radiológica de Adolescentes de la Ciudad de Temuco-Chile
Provedor de dados: 77
Autores: Silva M,Héctor; Collipal L,Erika; Martínez F,Cristian; Carrasco A,Vanesa; Rivas,Rene; Montiel,Enrique; Silva F,Tamara.
La dismetría de la pelvis es frecuente en los adolescentes y puede ser un factor que provoque dolores en la columna vertebral y estar asociada a escoliosis funcionales de la región lumbar. Estas disfunciones de la columna vertebral producen incapacidad laboral, son de alta prevalencia en el mundo. Este problema de salud pública es de origen multifactorial afecta a la mayoría de las personas principalmente en la edad media de la vida. El propósito del estudio fue conocer cómo se comportan nuestros adolescentes con respecto a la variable dismetría pélvica. Para ello se analizaron 49 radiografías panorámicas de columna vertebral, de escolares entre 13 y 17 años de ambos géneros, 24 hombres y 25 mujeres, de la ciudad de Temuco, Chile. Del total de sujetos, 33...
Tipo: Journal article
Palavras-chave: Pelvis; Desnivel pélvico; Columna lumbar.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100016

Dispersión de semillas por aves en un paisaje de bosque mesófilo en el centro de Veracruz, México: Su papel en la restauración pasiva
Provedor de dados: 97
Autores: HERNÁNDEZ-LADRÓN DE GUEVARA,IVETTE; ROJAS-SOTO,OCTAVIO R; LÓPEZ-BARRERA,FABIOLA; PUEBLA-OLIVARES,FERNANDO; DÍAZ-CASTELAZO,CECILIA.
La dispersión de semillas por aves puede jugar un papel determinante en el éxito de la restauración pasiva de los bosques ya que las aves pueden depositar semillas de especies pioneras y primarias, definiendo con ello la recuperación de la composición de la comunidad vegetal en el tiempo. En este trabajo se analizó la ingesta y dispersión de semillas por aves frugívoras como coadyuvantes en la restauración del bosque mesófilo de montaña en el centro de Veracruz, México. Las aves fueron clasificadas de acuerdo a su afinidad por el bosque y al estrato arbóreo en que concentran su actividad, con el fin de determinar si estas características se relacionan con la abundancia, riqueza y diversidad de las semillas que ingieren y dispersan. Se analizaron 93...
Tipo: Journal article
Palavras-chave: Aves frugívoras; Conostegia xalapensis; Germinación; Restauración de bosques.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000100007

Disponibilidad de Paja en los Rastrojos de Trigo en Tres Provincias de Chile
Provedor de dados: 113
Autores: Hetz H,Edmundo; de la Cerda A,Janette; López R,Marco.
La paja que queda en los rastrojos de trigo (Triticum aestivum L.) presenta grandes dificultades para cualquier faena de labranza o siembra directa que se quiera realizar sobre ellos. Los objetivos de esta investigación fueron analizar las cantidades de paja en los rastrojos de trigo y estimar las cantidades que podrían recolectarse con enfardadora desde el cordón dejado por la cosechadora. Se realizaron mediciones en 15 predios en las provincias de Linares, Ñuble y Malleco, las cuales incluyeron las cantidades de paja en el cordón dejado por la cosechadora, paja en pie, ancho y altura de corte, altura del trigo y contenido de humedad de la paja. Los resultados establecieron densidades entre 0,552 y 2,686 kg m-1 en el cordón, directamente relacionadas con...
Tipo: Journal article
Palavras-chave: Paja; Rastrojo.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000400008

DISPONIBILIDAD DEL FÓSFORO EN SUELOS ÁCIDOS DE MISIONES, ARGENTINA
Provedor de dados: 113
Autores: Vazquez,Sara; Morales,Luis Alberto; Dalurzo,Humberto Carlos.
La habilidad para predecir los requerimientos de P y realizar recomendaciones acertadas, es importante no sólo desde el punto de vista económico, sino también para la sustentabilidad del sistema al proteger el medio ambiente de los efectos perjudiciales del exceso de fertilizante. Los objetivos planteados fueron determinar la solución extractora de P que estima mejor su disponibilidad y establecer un análisis de rutina para suelos ácidos tropicales. Se estableció un ensayo en macetas en invernadero, usando como planta índice el ryegrass o ballica (Lolium perenne L.) y seis suelos ácidos de Misiones, Argentina, con tres niveles de P. La prueba t de medias no presentó diferencias entre P-Bray 2 con P-Olsen inorgánico, P-Olsen modificado total y...
Tipo: Journal article
Palavras-chave: P-biodisponible; Bray 2; Mehlich 1; Olsen; Suelos tropicales.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000100006

Disruption of ecosystem processes in western North America by invasive species
Provedor de dados: 97
Autores: Dukes,Jeffrey S.; Mooney,Harold A.
Many ecosystems of western North America have been dramatically changed by non-native species. Here, we review ecological impacts of 56 plant, animal, fungus, and protist species that were brought to this region by humans. We discuss characteristics of invasive species that can lead to major ecosystem impacts, and explore how invasive species alter many different attributes of ecosystems. Specifically, we include examples of invasive species that affect geomorphology, fire regimes, hydrology, microclimate, atmospheric composition, nutrient cycling, and productivity. Finally, we review the direct consequences of biological invasions for some native species. We summarize examples from this paper in Appendix 1. Our examples illustrate how, as invasive species...
Tipo: Journal article
Palavras-chave: Biological invasions; Ecosystem functioning; Community structure; Exotic species; Impact.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300003

Disruption of reproductive development in male rat offspring following gestational and lactational exposure to di-(2-ethylhexyl) phthalate and genistein
Provedor de dados: 48
Autores: Zhang,Lian-Dong; Deng,Qian; Wang,Zi-Ming; Gao,Ming; Wang,Lei; Chong,Tie; Li,He-Cheng.
Studies of developmental effects of mixtures of endocrine disrupters on the male reproductive system are of great concern. In this study, the reproductive effects of the co-administration of di-2-(ethylhexyl) phthalate (DEHP) and genistein (GEN) during pregnancy and lactation were studied in male rat offspring. Pregnant Sprague-Dawley rats were gavaged from gestation day 3 to postnatal day 21 with vehicle control, DEHP 250 mg/kg body weight (bwyday, GEN 50 mg/kg bwday, GEN 400 mg/kg bwday, and two combinations of the two compounds (DEHP 250 mg/kg bwday + GEN 50 mg/kg bwday, DEHP 250 mg/kg bwday + GEN 400 mg/kg bwday). The outcomes studied were general morphometry (weight, AGD), testicular histology, testosterone levels, and expression at the mRNA level of...
Tipo: Journal article
Palavras-chave: Di-2-(ethylhexyl) phthalate; Genistein; Pregnancy; Lactation; Reproductive system.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000200004

Dissolved Organic Carbon and Nitrogen in Andisol for Six Crop Rotations with Different Soil Management Intensity
Provedor de dados: 117
Autores: Undurraga D,Pablo; Zagal V,Erick; Sepúlveda W,Gloria; Valderrama V,Natalia.
Soil organic matter (OM) content is a quality indicator, but is an inadequate indicator in the short-term because these changes take place slowly, so dissolved organic components have emerged as an alternative. In volcanic soil subjected to different crop rotations with distinct land use intensity, dissolved organic C and N (DOC and DON) were determined as well as their relationship with total C and N contents in the soil, considering the effects of crop rotation, fertilization level, and soil depth. In humid samples of Humic Haploxerands collected at four depths up to 40 cm, DOC and DON contents were determined by extraction with K2SO4 and filtered. Results indicated interaction between the studied factors, DOC fluctuated between 67.8 and 151.7 mg kg-1...
Tipo: Journal article
Palavras-chave: Organic matter; Dissolved organic matter; Total C; Total N; Volcanic soil.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300018

Distances of Palmar Flexion Creases (Haustra Digiti) and Digital Formulae in Right and Left Handed People
Provedor de dados: 77
Autores: Kosif,Rengin; Diramali,Murat; Sertel,Seda.
Digital flexion creases are one of the external anatomical landmarks in the hand. In this study, we measured and compared the distances between the digital skin creases (haustra digiti) in the fingers of right-handed and left-handed individuals. We also recorded the digital formulae. No significant difference was detected between left and right-handed females and left and right handed males on distance of skin creases (p&gt;0.05). No difference was detected on haustra digiti of the right handed females their own hands. Females who use their left hand had a significantly longer(p=0.48) distal haustra digiti segment on their right second finger than that of their left hand. However, no significant difference was detected between male individuals on their...
Tipo: Journal article
Palavras-chave: Handedness; Palmar flexion creases; Digital formulae.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100028

Distinctive Effects of Red Wine and Diet on Haemostatic Cardiovascular Risk Factors
Provedor de dados: 48
Autores: MEZZANO,DIEGO.
The aim of this study was to compare the effects of Mediterranean-type diet (MD), high-fat diet (HFD), and red wine supplementation on plasma concentration of emergent haemostatic cardiovascular risk factors (HCVRF) and on variables of primary haemostasis (bleeding time, plasma von Willebrand factor and platelet aggregation/secretion). In a controlled prospective intervention study, two groups (21 healthy males each) received either MD or HFD during 90 days. Between days 30-60, both diets were supplemented with 240 ml/day of red wine. After adjusting by baseline values, MD was associated with: lower plasma fibrinogen (p =0.03), factor VIIc (p=0.034) and factor VIIIc (p=0.0057); higher levels of protein S (p=0.013); longer bleeding time (p=0.017); and...
Tipo: Journal article
Palavras-chave: Bleeding time; Cardiovascular risk factors; Diet; Haemostasis; Platelet function; Wine.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200007

Distraction Osteogenesis in Dentistry
Provedor de dados: 77
Autores: Fernandes,Flávio Henrique Carriço N; Orsi,Iara Augusta; Bezzon,Osvaldo Luiz.
Distraction osteogenesis is a technique for induction of new bone formation between two segments of a bone that presents wide possibilities of use in Dentistry. However, the available information on this subject is still scarce. The aim of this article is to review the literature related to bone formation, mechanically induced by distraction osteogenesis, in order to supply subsidies the agreement of this process.
Tipo: Journal article
Palavras-chave: Distraction osteogenesis; Bony formation; Dentistry.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300013

DISTRIBUCION, BATIMETRIA Y ALIMENTACION DE EPIGONUS CRASSICAUDUS DE BUEN, 1959 (PERCIFORMES: EPIGONIDAE) EN LA COSTA DE CHILE
Provedor de dados: 72
Autores: Leal,Elson; Contreras,Francisco; Oyarzún,Ciro.
Se estudió la distribución batimétrica y latitudinal de besugo (Epigonus crassicaudus) en la costa de Chile analizando los registros de la pesquería y a través de información complementaria recopilada desde los lances de pesca realizados en la evaluación directa de merluza común. Adicionalmente, se reportan antecedentes sobre los hábitos alimenticios de besugo a través de análisis del contenido estomacal de ejemplares recolectados en la zona central de Chile. Según la información de la actividad comercial, el recurso concentraría su distribución entre Valparaíso (33°04'S) y Puerto Montt (41 °46'S). Sin embargo, el crucero de evaluación, registra capturas positivas de besugo desde su limite norte de operación (29°00'S). En relación a la batimetría, tanto la...
Tipo: Journal article
Palavras-chave: Alimentación; Batimetría; Besugo; Distribución; Chile.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100012

Distribución de foraminíferos bentónicos (Protozoa: Foraminiferida) en la ensenada Quillaipe (41°32' S; 72°44' O), Chile: Implicaciones para el estudio del nivel del mar
Provedor de dados: 97
Autores: FERNÁNDEZ,LEONARDO D; ZAPATA,JAIME A.
Los foraminíferos de las marismas salobres son utilizados como indicadores del cambio producido en el nivel del mar durante el Holoceno. No obstante, los foraminíferos de las marismas de Chile han sido escasamente estudiados por lo que se desconoce la factibilidad de utilizarlos para este fin. Para subsanar esto se desarrolló una investigación en el intermareal de la ensenada de Quillaipe, Chile, con los objetivos de determinar los foraminíferos y su distribución vertical; analizar los parámetros que explican su distribución y determinar las especies que son útiles como indicadoras del nivel del mar. Los resultados revelaron 18 especies (nueve aglutinadas y nueve calcáreas) distribuidas en dos grandes Zonas (I y II). La Zona I se restringió a la parte más...
Tipo: Journal article
Palavras-chave: Chile; Distribución vertical; Foraminíferos; Marisma salobre; Nivel del mar.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000400010

Distribución de genes de resistencia a arsénico en bacterias aisladas de sedimentos con concentraciones variables del metaloide
Provedor de dados: 72
Autores: Mellado,Carolina; Campos,Víctor; Mondaca,María A.
El arsénico es un elemento tóxico, ampliamente distribuido en ambientes terrestres y acuáticos. La biotransformación bacteriana juega un importante rol en el ciclo biogeoquímico de este metaloide, interviniendo en la movilidad, distribución y biodisponibilidad de las distintas especies de arsénico en el ambiente. El objetivo de este trabajo fue relacionar la presencia de los genes arsCBA en bacterias aisladas desde zonas con distintas concentraciones de arsénico presente en los sedimentos de diferentes sectores del río Camarones (Región Arica y Parinacota). Se aislaron 34 cepas bacterianas arseniato-resistentes, a las cuales se les determinó los niveles de tolerancia a As(V) y As(III); la actividad reductora de arseniato, mediante la técnica...
Tipo: Journal article
Palavras-chave: Arseniato; Bacterias arseniato-reductoras; Genes arsCBA.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200001

Distribución de la Precipitación y Producción de Semillas de Alfilerillo, Erodium moschatum (L.) L' Hér.
Provedor de dados: 113
Autores: Olivares,Alfredo; Johnston,Myrna; Salas,Eugenio.
Se evaluó el efecto de la distribución de la precipitación en la producción y calidad de semillas de alfilerillo, Erodium moschatum (L.) L´Hér. Se usaron cuatro tratamientos de precipitación de un año normal simulada: distribución temprana; distribución normal; distribución tardía, y un tratamiento control sin restricción hídrica. Se sembraron 10 semillas, previamente escarificadas, y luego de la emergencia se raleó dejando cuatro plantas por maceta. La precipitación, correspondiente a un año real, se aplicó mediante un dispensador de suero. Esta especie sin restricción hídrica produjo en promedio 4.025 semillas y 14,8 g de MS vegetativa total por maceta; la precipitación normal en cantidad produjo, en el mejor caso, 1.710 semillas y 1,2 g de MS vegetativa...
Tipo: Journal article
Palavras-chave: Etapas fenológicas; Déficit hídrico; Eficiencia reproductiva.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000300005

Distribución de las Arterias Coronarias en el Rinoceronte Blanco (Ceratotherium simum)
Provedor de dados: 77
Autores: Pérez,William; Lima,Martin.
Nosotros disecamos un corazón de rinoceronte blanco con el objetivo de dar una descripción anatómica de la distribución de sus arterias coronarias. Se registró la longitud y el calibre de las ramas principales. Las arterias coronarias tenían el mismo calibre en su origen y la arteria coronaria derecha emitía la rama interventricular subsinusal, el rinoceronte correspondía al patrón de coronaria derecha. La arteria coronaria izquierda emitida en el seno izquierdo de la aorta se dividía en tres ramas (trifurcación), la rama interventricular paraconal, la rama circunfleja y la rama diagonal.
Tipo: Journal article
Palavras-chave: Anatomía animal; Anatomía cardiaca; Animales silvestres; Rhinocerotidae; Vasos coronarios.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300023

Distribución de las macroalgas en la laguna arrecifal de Banco Chinchorro: arrecife coralino del Caribe mexicano
Provedor de dados: 73
Autores: GONZÁLEZ,ALICIA; TORRUCO,DANIEL.
Se analizaron las macroalgas de fondos suaves de la laguna arrecifal de la Reserva de la Biosfera de Banco Chinchorro en junio de 2009, 2010 y 2011. El objetivo de la investigación fue conocer la estructura de las algas y sus cambios interanuales en una misma época. Se registraron 21 especies, Chondrophycus papillosus fue la dominante, los intervalos de diversidad estuvieron de 2,8 a 9,9 beles/ind. en los fondos arenosos; el área más diversa fue la parte media de la laguna. La similitud de localidades fue obtenida con el índice de Morisita y presentan un grupo heterogéneo que caracterizan áreas específicas dentro de la laguna arrecifal, principalmente cerca del borde de barlovento. El análisis canónico muestra la posición espacial de sitios y especies en...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100014

Distribución de Liolaemus torresi (Squamata: Liolaemidae), lagarto endémico del desierto de Chile
Provedor de dados: 72
Autores: RIVEROS-RIFFO,EDVIN; TORRES-MURA,JUAN C.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200012

Distribución de los Nervios Cutáneo Dorsal Medial y Cutáneo Dorsal Intermedio en el Hombre
Provedor de dados: 77
Autores: Hunter,Karina; del Sol,Mariano.
Gran parte de la inervación sensitiva del dorso del pie está dada por los ramos cutáneos del nervio fibular superficial, los nervios cutáneo dorsal medial (NCDM) y cutáneo dorsal intermedio (NCDI). El objetivo de esta investigación fue estudiar las divisiones de los NCDM y NCDI a nivel del tercio distal de la pierna y el dorso del pie, para contribuir con conocimientos específicos al abordaje quirúrgico de la región. Disecamos 19 piernas y pies en cadáveres de individuos adultos, masculinos, correspondientes al Departamento de Morfología de la Universidad de La Frontera de Temuco. Se dividió el dorso del pie, en tercios anterior, medio, posterior y luego, las divisiones observadas se padronizaron. La división de los NCDM y NCDI, en ramos medial y lateral,...
Tipo: Journal article
Palavras-chave: Nervio cutáneo dorsal medial; Nervio cutáneo dorsal intermedio; Distribución.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300036

Distribución de los Patrones Venosos de la Fosa Cubital en una Muestra de Personas Nacidas en Bucaramanga, Colombia
Provedor de dados: 77
Autores: Corzo Gómez,Edgar Giovanni; Gómez Díaz,Olga Lucía; Niño Mantilla,María Eugenia; Rey Triana,Ruby Jackeline; Pedraza Díaz,Leidy Johanna.
El uso racional del acceso a las venas superficiales en la fosa cubital es de especial relevancia en pacientes pediátricos, con fístulas para diálisis, en quimioterapia, o como vías para acceso venoso central. Se han descrito varios patrones venosos con sus beneficios o riesgos. Se determinó la frecuencia de los patrones venosos en una población de ambos sexos nacida en Bucaramanga, Colombia, en 800 miembros superiores (200 hombres y 200 mujeres), conforme a la clasificación propuesta por del Sol et al. (1988, 2007). El análisis descriptivo para variables cualitativas nominales y ordinales mediante porcentajes, las cuantitativas con media y desviación estándar en el caso de variables con distribución normal y las no paramétricas identificadas con número...
Tipo: Journal article
Palavras-chave: Punción venosa; Venas; Fosa cubital.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400005

Distribución de los Patrones Venosos de la Fosa Cubital en una Muestra de Personas Nacidas en el Departamento de Santander, Colombia
Provedor de dados: 77
Autores: Corzo Gómez,Edgar Giovanni; Gómez Díaz,Olga Lucía; Niño Mantilla,María Eugenia; Ramírez Vargas,Lina María; Zárate Sierra,Lizeth Melisa.
Se determinó la frecuencia de los patrones venosos superficiales del miembro superior en una muestra de 885 personas (438 hombres y 447 mujeres) nacidas en el Departamento de Santander, Colombia de acuerdo a la clasificación propuesta por del Sol et al. El patrón que predominó fue el I con 524 casos (30%) seguido del patrón III con 451 casos (26%). El patrón I fue el más frecuente tanto en el miembro superior derecho con 286 casos (32%) como en el miembro superior izquierdo con 238 casos (27%). En hombres el patrón predominante fue el I con 307 casos (35%) seguido del patrón II con 228 casos (26%). En mujeres el patrón predominante fue el III con 367 casos (41%) seguido del patrón I con 217 casos (24%). El patrón en "M clásica" tuvo una frecuencia similar...
Tipo: Journal article
Palavras-chave: Venas superficiales; Vena cefálica; Vena Basílica.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100037

Distribución de macroinvertebrados (Plecoptera y Aeglidae) en ecosistemas fluviales de la Patagonia chilena: ¿Muestran señales biológicas de la evolución geomorfológica postglacial?
Provedor de dados: 97
Autores: VALDOVINOS,CLAUDIO; KIESSLING,ANDREA; MARDONES,MARÍA; MOYA,CAROLINA; OYANEDEL,ALEJANDRA; SALVO,JACQUELINE; OLMOS,VIVIANA; PARRA,ÓSCAR.
La Patagonia chilena incluye uno de los sistemas hídricos más complejos de Sudamérica y uno de los menos intervenidos del mundo, los cuales fueron intensamente modelados por la actividad glacial del Cuaternario. El objetivo de este estudio fue determinar si en esta área existen zonas de endemismo de macroinvertebrados bentónicos fluviales y analizar los patrones de diversidad de organismos de alta (Plecoptera) y baja vagilidad (Aeglidae). Entre el 2006 y 2009 se muestrearon 183 sitios entre 42°50' y 54°43' S, focalizándose en las principales cuencas. Los muéstreos se realizaron con una red "kicknet", cubriendo una superficie de fondo de 8 m². En toda el área se registraron 30 especies de Plecoptera y dos de Aeglidae. Se identificó una zona de endemismo en...
Tipo: Journal article
Palavras-chave: Aegla; Biodiversidad; Biogeografía; Patagonia; Plecoptera.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000200008

Distribución de plántulas y germinación de semillas del lúcumo chileno (Pouteria splendens) en Los Molles, Chile
Provedor de dados: 97
Autores: SOTES,GASTÓN J; BUSTAMANTE,RAMIRO O; HENRÍQUEZ,CAROLINA A.
Pouteria splendens (lúcumo chileno, palo colorado) es un árbol endémico de Chile central con problemas de conservación. Es la única especie representante de la familia Sapotaceae en el país y se conoce muy poco de su ciclo de vida. En este trabajo describimos el patrón de distribución espacial de plántulas en la población remanente de mayor tamaño de la especie, e investigamos el efecto de la disponibilidad de agua, la presencia de pericarpo en las semillas y de la hojarasca en la capacidad de germinación. La densidad de plántulas fue mayor bajo el dosel de las plantas madres, que fuera de estas. Solo la disponibilidad de agua tuvo un efecto significativo sobre la germinación. La especie tiene el potencial de regenerar, en futuros planes de conservación y...
Tipo: Journal article
Palavras-chave: Árbol endémico; Dosel; Especie amenazada; Hojarasca; Pericarpo.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300010

Distribución de Receptores de Estrógenos Beta en el Ovario de Ovejas Prepúberes
Provedor de dados: 77
Autores: Vasconcellos C,Adriana; Paredes H,Marco; Aguilar G,Cecilia; Navarrete V,Javiera.
Las hormonas esteroidales tienen un papel esencial en la fisiología reproductiva, actúan en el ovario estableciendo comunicación entre este y la glándula hipofisiaria y también en forma paracrina como reguladores locales. Se ha descrito expresión de receptores de estrógeno a nivel de ovarios fetales, neonatales y adulto, siendo necesario determinar cuales son los tipos celulares que expresan estos receptores. El ovario ovino es estereogénico activo desde la etapa fetal y por lo tanto los esteroides desempeñan un importante papel en el desarrollo gonadal. La regulación del crecimiento folicular está relacionado a varios factores por un lado la secreción de gonadotropinas por la hipófisis interviene durante el desarrollo folicular tardío, existiendo...
Tipo: Journal article
Palavras-chave: Oveja; Ovario; Receptor de estrógeno; Raza Araucana.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100061

Distribución de Taxus globosa (Taxaceae) en México: Modelos ecológicos de nicho, efectos del cambio del uso de suelo y conservación
Provedor de dados: 97
Autores: CONTRERAS-MEDINA,RAÚL; LUNA-VEGA,ISOLDA; RÍOS-MUÑOZ,CÉSAR A.
Taxus globosa es una gimnosperma que habita principalmente en los bosques templados de México y el norte de América Central, y que está considerada como amenazada por las agencias de conservación tanto mexicanas como internacionales. En México, una de las mayores amenazas para la mayoría de las especies de los bosques nublados es la pérdida de hábitat, la cual se propicia por la modificación de la cobertura vegetal por factores antropogénicos. Con base en 73 registros de herbario se obtuvo la distribución potencial de la especie mediante el algoritmo Maxent. Asimismo, a partir del modelo obtenido se analizó la modificación de la cobertura vegetal durante tres períodos (1976, 1996 y 2000) y su influencia en la distribución potencial de esta especie. Su...
Tipo: Journal article
Palavras-chave: Áreas naturales protegidas; Distribución potencial; Maxent; Romerillo.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000300009

Distribución del carbono orgánico del suelo almacenado en el perfil de un Alfisol en ecosistemas Mediterráneos de Chile
Provedor de dados: 127
Autores: Muñoz,Cristina; Ovalle,Carlos; Zagal,Erick.
The overexploitation of the natural resources in the Mediterranean-type climate region of Chile, has resulted in natural forest fragmentation and expansion of Acacia caven (Mol), forming the ‘Espinal’ ecosystem (EE) that includes two million of hectares in the Central part of Chile. The effect of the anthropogenic intervention over the soil organic carbon (SOC) in these ecosystems is unknown. The aim of this study was to quantify the SOC stocks and it profile distribution in the EE. This was achieved by collecting soils samples according to soil coverage percentage canopy from: well-preserved Espinal (WPE), 51-80 %; good-preserved (GE), 26-50 %; degraded (DE), 11-25 % and very degraded (VDE), 0-10 %. We also included a native forest (NF), 80-98 % of soil...
Tipo: Journal article
Palavras-chave: Acacia caven; Degraded ecosystems; Soil use intensity.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000100002

Distribución del cobre en ecosistemas forestales de tipo mediterraneo
Provedor de dados: 97
Autores: DELGADO,LUISA; SEREY,ITALO.
En este estudio hemos usado el método comparativo para analizar la distribución de la concentración total de cobre en los componentes de dos ecosistemas forestales, y el efecto del ingreso de cobre antropogénico. Los componentes ecosistémicos se definieron a partir de un modelo conceptual basado en la aproximación proceso-funcional. Los componentes bióticos correspondieron a las estructuras morfológicas de los árboles; en tanto que los abióticos a los distintos horizontes del suelo. Se escogieron dos áreas que difieren en cuanto a la ausencia (ecosistema de referencia) y presencia (ecosistema perturbado) de ingreso de cobre antropogénico generado por la Refinería de Ventanas-Maitencillo. Los resultados muestran que el cobre antropogénico es retenido en el...
Tipo: Journal article
Palavras-chave: Aproximación proceso-funcional; Estudio comparativo; Cobre; Ecosistemas forestales.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000300007

Distribución del Nervio Ulnar: Inervación de los Músculos Interóseos, Lumbricales y Aductor del Pulgar
Provedor de dados: 77
Autores: Olave,Enrique; del Sol,Mariano.
La anatomía detallada de las estructuras de la mano es de importancia para efectuar diagnósticos precisos como también para restaurar las funciones después de lesiones en esta parte del miembro superior. Basados en esta premisa y con el propósito de aportar datos a este tema, sistematizamos la distribución del ramo profundo del nervio ulnar (RPNU) en relación a la inervación entregada a los músculos interóseos palmares y dorsales (IP e ID), lumbricales 3º y 4º (L3 y L4) y cabezas oblicua (COAP) y transversa (CTAP) del aductor del pulgar. Para ello, utilizamos 10 manos de cadáveres formolizados de individuos adultos, de sexo masculino, utilizando disección convencional. La disección e identificación de los ramos se hizo de medial hacia lateral. El primer...
Tipo: Journal article
Palavras-chave: Mano; Nervio ulnar; Ramos musculares.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400028

Distribución del Ramo Profundo del Nervio Ulnar en los Músculos Intrínsecos del Dedo Mínimo en Individuos Chilenos
Provedor de dados: 77
Autores: Pacheco,Juan Pablo; Olave,Enrique.
El conocimiento detallado de la inervación de las estructuras de la mano permite la restauración de sus funciones frente a lesiones a las que se encuentra frecuentemente sometida. El objetivo de esta investigación fue determinar la distribución del ramo profundo del nervio ulnar en los músculos intrínsecos del dedo mínimo, localizando el origen de cada ramo y su punto de ingreso en el vientre muscular en un grupo de individuos chilenos. Se disecaron 23 manos de cadáveres formolizados de individuos chilenos, adultos, pertenecientes a la Unidad de Anatomía de la Universidad de la Frontera, Chile, en las cuales se realizó disección de la región palmar, exponiendo los músculos hipotenares y el ramo profundo del nervio ulnar (RPNU) localizando a los ramos...
Tipo: Journal article
Palavras-chave: Nervio ulnar; Músculos de la mano; Dedo mínimo.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200040

DISTRIBUCIÓN ESPACIAL Y TEMPORAL DE LA PRECIPITACIÓN Y LA HUMEDAD DEL SUELO EN TRES SITIOS FORESTALES DE LA VIII REGIÓN DE CHILE
Provedor de dados: 113
Autores: A. Bonilla,Carlos; Bonomelli,Claudia; Urrutia,Gonzalo.
En Chile existen alrededor de dos millones de hectáreas con plantaciones forestales, destacándose la VIII Región, por sus favorables condiciones climáticas. Considerando la importancia que tiene el régimen hídrico sobre estas especies, el objetivo de este estudio fue caracterizar las precipitaciones y humedad del suelo en tres sitios representativos de las condiciones de Secano Costero, Valle Central y Precordillera de la región. Los sitios empleados se ubican entre los 37°00 y 37°45’ lat. Sur y 72°00 y 73°10’ long. Oeste. Desde septiembre de 1993 y hasta agosto de 1996 se registraron las temperaturas, precipitación y contenido de humedad del suelo en cada sitio. Los resultados indican que la precipitación mensual en el sitio de Precordillera no fue...
Tipo: Journal article
Palavras-chave: Eucalyptus spp.; Hidrología forestal; Balance hídrico; Disponibilidad de agua en el suelo.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000400006

Distribución geográfica del género Gyriosomus Guérin-Méneville, 1834 (Coleoptera: Tenebrionidae): una aproximación biogeográfica
Provedor de dados: 97
Autores: PIZARRO-ARAYA,JAIME; JEREZ,VIVIANE.
Se realizó un análisis de parsimonia de endemismo para el género Gyriosomus, taxón monofilético, erémico y endémico del norte de Chile. En este trabajo se evalúa (i) si los patrones de distribución de las especies de Gyriosomus están determinados por la heterogeneidad del hábitat y (ii) si que las discontinuidades distribucionales de los taxa reflejan áreas de endemismo. Para ello se determinaron áreas de endemismo para las especies de Gyriosomus, se relacionaron con formaciones vegetacionales, y se establecieron las relaciones biogeográficas entre los distintos ecosistemas descritos para el norte de Chile. El área de estudio correspondió a la distribución del género y fue dividida en cuadrículas de un cuarto de grado de latitud y medio grado de longitud;...
Tipo: Journal article
Palavras-chave: Biogeografía Tenebrionidae; Gyriosomus áreas de endemismo desiertos costeros.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300008

Distribución histórica y actual de la lagartija Liolaemus pictus (Dumeril &amp;amp; Bibron 1837) (Liolaemidae) y nuevo límite continental sur de distribución
Provedor de dados: 72
Autores: Vera-Escalona,Iván M; Coronado,Tania; Muñoz-Mendoza,Carla; Victoriano,Pedro F.
Basado en los registros de la literatura y datos obtenidos de nuestras colectas, discutimos la distribución actual de Liolaemus pictus. La comparación de los resultados indica que esta especie no ha sido detectada en la depresión intermedia de Chile desde 1934. Lo anterior implica que dichas poblaciones se han extinguido, seguramente como consecuencia de la deforestación. Al mismo tiempo, extendemos el límite sur de la distribución conocida de L. pictus hasta los 44 °S en la Región de Aysen.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200008

DISTRIBUCION Y ABUNDANCIA DE LARVAS DE EMERITA ANALOGA (STIMPSON 1857) (DECAPODA, ANOMURA) EN LA ZONA DE COQUIMBO Y CALDERA, CHILE
Provedor de dados: 72
Autores: Flores,Eduardo; Mujica,Armando.
En octubre (5 al 26) y diciembre (17 al 24) de 2005 se tomaron muestras zooplanctónicas en 40 estaciones, en las zonas de Coquimbo (29º21’-30º15’ S) y Caldera (26º46’-27º08’ S) (Proyecto FIP Nº 2004-45). De ellas se separó la totalidad de larvas de Emerita analoga, determinándose sus estados de desarrollo, abundancia relativa, dominancia numérica y frecuencia de ocurrencia. La distribución segregada de los diferentes estados de desarrollo en las dos épocas y áreas muestreadas y su relación con la ubicación de las playas de arena en que viven los adultos, permite inferir la dispersión de las larvas. Se relaciona la distribución y abundancia de las larvas con las posibles zonas de eclosión. Las primeras zoeas fueron más abundantes en ambas zonas,...
Tipo: Journal article
Palavras-chave: Dispersión; Emerita analoga; Estadios larvales.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000200005

Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile
Provedor de dados: 97
Autores: SEPÚLVEDA,MARITZA; OLIVA,DORIS; URRA,ALEJANDRA; PÉREZ-ÁLVAREZ,MARÍA J; MORAGA,RODRIGO; SCHRADER,DANIEL; INOSTROZA,PATRICIA; MELO,ANGELA; DÍAZ,HUMBERTO; SIELFELD,WALTER.
The onshore distribution and abundance of the South American sea lion Otaria flavescens along the central Chilean coast was estimated during the period January-February 2007. Additionally, changes in population abundance during the period 1970-2007 were examined. Population surveys were based on photographs taken from boats or aircraft. A total of 16301 sea lions (CI = 16209-16375) were counted in 33 colonies (6 breeding and 27 non-breeding sites). After correction to account for the proportion of individuals at sea and for pups not seen at the time of the survey, the mean estimated abundance was 18179 (95 % CI = 17777-18851) sea lions. Population trend analysis showed that from 1970 to 1985, South American sea lions showed a positive increase of...
Tipo: Journal article
Palavras-chave: Census; Chilean coast; Otaria flavescens; Overexploitation; Sea lions.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100007

Distribution and Expression of Visfatin-Positive Cells in the Spleen of Lipopolysaccharide-Stimulated Piglets
Provedor de dados: 77
Autores: Xiao,Ke; Qiu,Chang-Wei; Chen,Min; Yang,Zhi; Wang,Jing; Peng,Ke-Mei; Song,Hui.
The histological changes in the spleen and the immunohistochemical expression of visfatin in lipopolysaccharide-stimulated piglets are reported to examine the relation between visfatin and inflammation. The results are as follows: (1) After LPS treated, the spleen displayed thicker capsules and trabecula, the thinner periarterial lymphatic sheath, and the more expandable splenic sinusoid, with an increase in the number of splenic nodules, lymphocytes, ellipsoids of the marginal zone, red blood cells and macrophagocytes. (2) Visfatin-positive cells were mainly distributed in the red pulp of the spleen, with less in splenic nodules and periarterial lymphatic sheath. In the LPS-treated group, the signal intensity and quantity of the visfatin-positive cells...
Tipo: Journal article
Palavras-chave: Visfatin; Spleen; Lipopolysaccharide; Piglets.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400052

Distribution and habitat ecology of the sorediate species of Menegazzia (Parmeliaceae, lichenized Ascomycota) in Chile
Provedor de dados: 97
Autores: BJERKE,JARLE W; ELVEBAKK,ARVE; QUILHOT,WANDA.
ABSTRACT The taxonomy and ecology of the sorediate species of Menegazzia from the southernmost regions of Chile and Argentina and the South Atlantic Islands was recently published, only with sporadic reports from the more northern regions. In the present work the distribution patterns and habitat ecology of the sorediate species are discussed, with emphasis on the area north of 48º S. Eleven species are treated. Menegazzia subpertusa, an epiphyte of sclerophyll scrubs, is recorded from South America for the first time (Chile and Argentina). Menegazzia neozelandica has a disjunct distribution in Chile, with occurrences in Fray Jorge (Fourth Region of Chile) and on Islas Juan Fernández, and along the coast south of latitude 38º S. Menegazzia kawesqarica and...
Tipo: Journal article
Palavras-chave: Lichens; Biogeography; Climatic gradients.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000100008

Distribution and Morphology of Ghrelin-Immunopositive Cells in the Thymus of the African Ostrich
Provedor de dados: 77
Autores: Wang,Jia-xiang; Li,Peng; Zhang,Xiao-ting; Ye,Li-xun.
Ghrelin, an endogenous ligand for the growth hormone secretagogue receptor, has been detected in the thymus of multiple vertebrates. However, little is known about its distribution in the thymus of the African ostrich. In this study, we evaluated the distribution and morphological characteristics of ghrelin-producing cells in the thymus of the African ostrich. Our results revealed that the thymus consists of a capsule and a parenchyma, which comprises the cortex and medulla. Compared to the cortex, the medulla had a fewer number of thymocytes and a greater number of epithelial cells. Additionally, three thymic corpuscles were identified. Ghrelin-immunopositive (ghrelin-ip) cells were detected both in the cortex and medulla of the African ostrich thymus,...
Tipo: Journal article
Palavras-chave: African ostrich; Ghrelin; Thymus; Immunohistochemistry.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200026

Distribution and Quantification of Lymphocytes in the Major Lymphoid Organs of Naturally Gumboro Infected Broilers
Provedor de dados: 77
Autores: Uddin,Mohammad Mejbah; Islam,Mohammad Saiful; Basu,Joyita; Khan,Md. Zahirul Islam.
Gumboro disease is caused by the infectious bursal disease virus (IBDV) which rapidly destroys immature B-lymphocytes of bursa of Fabricious, and causes immune suppression and high mortality in commercial broiler farms in Bangladesh. To investigate the possible effect of IBDV on lymphocytes and its distribution in the major lymphoid organs, bursa of Fabricious including spleen and thymus of naturally Gumboro-infected broilers, a research was conducted in the Department of Anatomy and Histology, collaboration with the Department of Pathology, Bangladesh Agricultural University, Bangladesh. Bursa of Fabricious, spleen and thymus of 21-days-old Gumboro-infected and non-infected broilers of same age (control) were routinely processed and stained by hematoxylin...
Tipo: Journal article
Palavras-chave: Lymphocyte; Gumboro; Lymphoid organs; Broiler.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400050

Distribution and recycling of canopy nitrogen storage reserves in sweet cherry (Prunus avium) fruiting branches following 15N-urea foliar applications after harvest
Provedor de dados: 118
Autores: Ayala,Marlene; Bañados,Pilar; Thielemann,Mariana; Toro,Román.
In sweet cherries, accumulated nitrogen (N) stores from the previous fall support early spring growth. To complement the N supply in the soil, Chilean growers use foliar urea applications after harvest. Information on the effectiveness of foliar N applications in sweet cherry is lacking. To study the canopy distribution of N applied as urea foliar sprays, an experiment using a "Bing"/"Gisela®6" ("GI®6") sweet cherry orchard was carried out in 2009/2010 in Chile (35° 09' 53'' S, 71° 20' 43'' W). The objective was to investigate N distribution and recycling in 3-year-old fruiting branches. A total of 120 branches (one per tree) were labeled using 15N-urea. 15N-urea was applied to the whole branch on four separate dates or treatments (TR) after fruit harvest:...
Tipo: Journal article
Palavras-chave: Bark; Buds; Canopy; Leaves; N use efficiency; Fruit; Stored N; Spur; Sweet cherry wood.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100007

Distribution of aquaporins in the nasal passage of Octodon degus, a South-American desert rodent and its implications for water conservation
Provedor de dados: 97
Autores: GALLARDO,PEDRO; HERRERA,SOFÍA; SAFFER,KARIN; BOZINOVIC,FRANCISCO.
Rodents from arid and semiarid environments live under conditions where the spatial and temporal availability of water is limited. Octodon degus is a South-American desert-dwelling rodent inhabiting arid and semiarid habitats of central and northern Chile. Its survival depends on morphological, physiological and behavioral adaptations that allow water conservation. This rodent has a high urine concentrating ability, high capacity of fecal dehydration and low evaporative water loss, related to the ability of the nasal passages to condense water from the exhaled air; this water must be absorbed in order to avoid its accumulation in the nasal passages and potential loss through the nostrils. We hypothesize that aquaporins (AQPs) might be present in the nasal...
Tipo: Journal article
Palavras-chave: Aquaporin; Nasal passage; Desert rodent.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000100003

Distribution of Buglossoides arvensis (L.) I.M.Johnst. (Boraginaceae) in South America: new records for the floras of Chile, Bolivia, Peru and Colombia
Provedor de dados: 73
Autores: WEIGEND,MAXIMILIAN; ALVAREZ,MIGUEL.
Buglossoides arvensis (L.) I.M. Johnst. (Boraginaceae), una maleza de origen euroasiático, sólo ha sido mencionada en Sudamérica para las floras de Argentina y Uruguay. En este trabajo se amplía su distribución en el continente para Bolivia, Chile, Colombia y Perú, donde esta especie ha sido observada como maleza de cultivos y en ambientes alterados. También se sospecha su presencia en Ecuador y una frecuencia mucho mayor a la actualmente conocida en Bolivia, Chile y Colombia.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100017

Distribution of delta sleep-inducing peptide in the newborn and infant human hypothalamus: an immunohistochemical study
Provedor de dados: 48
Autores: NAJIMI,MOHAMED; BENNIS,MOHAMED; MOYSES,EMMANUEL; CHIGR,FATIHA.
The distribution of delta sleep-inducing peptide immunoreactive cell bodies, fibers, and terminal-like structures was investigated in the normal human hypothalamus during the first postnatal year, using immunohistofluorescence and peroxidase anti-peroxidase techniques. Immunolabeled perikarya were relatively few and were mostly scattered through the anterior (preoptic) and mediobasal regions (infundibular nucleus) of the hypothalamus. DSIP-immunoreactive fibers and terminal-like fibers were observed throughout the entire rostro-caudal extent of the hypothalamus. They exhibit high densities in the preoptic region, the organum vasculosum of lamina terminalis, infundibular nucleus and median eminence. Moderate to low densities of DSIP-immunoreactive fibers...
Tipo: Journal article
Palavras-chave: DSIP; Immunohistochemistry; Development; Post-mortem; Human brain.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000100013

Distribution of grasses along an altitudinal gradient in a Venezuelan paramo
Provedor de dados: 97
Autores: MÁRQUEZ,EDJULY J.; FARIÑAS,MARIO R.; BRICEÑO,BENITO; RADA,FERMÍN J.
In Venezuelan paramos grasses, after Asteraceae, are the second family in numerical importance. We studied their distribution in an altitudinal gradient located in Venezuela, Sierra de La Culata, between 2,500 and 4,200 m of altitude. Twenty one 32 m parallel line transects every 50 m were placed along the gradient, perpendicular to the main slope. Each line was divided into contiguous 50 x 50 cm sampling units. Grass species occurrence inside each sample unit was considered to determine their frequency in each line or altitude. The peak and altitudinal amplitude was determined through the weighted averaging method. A total of 47 grass species were found along the gradient. Agrostis was the best-represented genus in the gradient. Considering the...
Tipo: Journal article
Palavras-chave: Altitudinal patterns; Phytogeography; Poaceae; South American Andes; Tropical high mountain.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400008

Distribution of Hepatic Myofibroblasts and Type I and III Collagen in Rat Liver Cirrhosis Induced by Thioacetamide
Provedor de dados: 77
Autores: Poonkhum,Raksawan; Pradidarcheep,Wisuit; Nilbu-Nga,Somneuk; Chaunchaiyakul,Suwadee.
Thioacetamide (TAA) can induce various types of cirrhosis in the rat, including bridging fibrosis, biliary fibrosis, perisinusoidal/pericellular fibrosis and centrilobular fibrosis, in which different populations of hepatic myofibroblasts (MFs) are involved. The hepatic MFs can be classified into 3 groups: (a) portal/septal MFs; (b) activated hepatic stellate cell myofibroblasts (HSC/MFs); and (c) interface myofibroblasts (IF/MFs). The present study was carried out to examine the morphology and localization of hepatic MFs in relation to the distribution of type I and III collagen in rat cirrhotic livers. Immunohistochemistry to a-smooth muscle actin was employed to demonstrate the morphology and localization of the subpopulations of hepatic MFs. The...
Tipo: Journal article
Palavras-chave: Hepatic myofibroblasts Type I; III collagens Thioacetamide Cirrhosis.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200033

Distribution of linker histone variants during plant cell differentiation in the developmental zones of the maize root, dedifferentiation in callus culture after auxin treatment
Provedor de dados: 48
Autores: ALATZAS,ANASTASIOS; SREBREVA,LJUBA; FOUNDOULI,ATHINA.
Although several linker histone variants have been studied in both animal and plant organisms, little is known about their distribution during processes that involve alterations in chromatin function, such as differentiation, dedifferentiation and hormone treatment. In this study, we identified linker histone variants by using specific anti-histone Hl antibodies. Each variant's ratio to total Hl in the three developmental zones of maize (Zea mays L.) root and in callus cultures derived from them was estimated in order to define possible alterations either during plant cell differentiation or during their dedifferentiation. We also evaluated linker histone variants' ratios in the developmental zones of maize roots treated with auxin in order to examine the...
Tipo: Journal article
Palavras-chave: Callus culture; Linker histone; Plant cell differentiation; Plant hormone; Zea mays.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000200010

Distribution of planktonic cnidarian assemblages in the southern Gulf of Mexico, during autumn
Provedor de dados: 97
Autores: Martell-Hernandez,Luis F; Sanchez-Ramirez,Marina; Ocaña-Luna,Alberto.
BACKGROUND: Despite their ecological, economic and medical relevance, very little information is available on the distribution of planktonic cnidarians, this being particularly true for some regions of the ocean such as the Gulf of Mexico. In fact, the effect of locally important oceanographic features such as the offshore autumnal transport on the distribution of planktonic cnidarians has long been overlooked in this region. Because of this, the present study aimed to analyse the spatial patterns of planktonic cnidarian assemblages in the southern Gulf of Mexico during the autumn of 1998, when particularly intense conditions of convergence, offshore water transportation and productivity were recorded. The assemblages were described in terms of their...
Tipo: Journal article
Palavras-chave: Campeche Bay; Gelatinous zooplankton; Medusae; Siphonophores; Surface circulation.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100028

Distribution of Serotonin-immunoreactive Enterochromaffin Cells in the Gastrointestinal Tract of the Least Shrew (Cryptotis parva)
Provedor de dados: 77
Autores: Al-Tikriti,Mohammed S; Khamas,Wael; Chebolu,Seetha; Darmani,Nissar A.
Serotonin is an important neurotransmitter in the central (CNS) and peripheral (PNS) nervous systems. It is involved in a variety of physiological processes both in the gut and in the CNS. The present study examined the distribution of serotonin containing enterochromaffin cells in the gastrointestinal tract (GIT) of a vomit competent species, the least shrew. These cells were easily recognized by their globular granules stained with the H&amp;E and serotonin immune-positive stain. The immunoreactive enterochromaffin cells (IERCs) were mainly confined to the basal portion of the glandular epithelium and were distributed throughout the shrew stomach, small and large intestine. None was found to be associated with the mucosal epithelial lining. Moreover,...
Tipo: Journal article
Palavras-chave: Least shrew; Enterochromaffin cells; Serotonin; Immunohistochemical; Stomach; Duodenum; Jejunum; Ileum; Colon.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300025

Distributional patterns of the South American species of Hyalella (Amphipoda: Hyalellidae)
Provedor de dados: 72
Autores: De los Ríos-Escalante,Patricio; Morrone,Juan J; Rivera,Reinaldo.
Distributional patterns of the South American species of the freshwater amphipod genus Hyalella were analysed using a panbiogeographic approach. Five generalized tracks were found: (1) northern Andes to Lake Titicaca (H. dielaii, H. meinerti, H. dybowskii, H.jelskii, H. lubominsky, and H. pauperocavae; (2) lake Titicaca (H. armata, H. cuprea, H. latinamus, H. lucifugax, H. montforti, H. neveulemairei, H. robusta, H. tiwanaku, H. simplex simplex, and H. solida); (3) central Andes (H. fossamancinii and H. kochi); (4) Pampas (H. bonariensis, H. caeca, H. castroi, H. longispina, H. montenegrinae, H. pampeana, H. pernix, H. pseudoazteca, and H. warmingii); and (5) Subantarctic (H. patagonica H. costera, H. curvispina, H. chiloensis, H. falklandensis, H....
Tipo: Journal article
Palavras-chave: Chile; Hyalella South America; Biogeography.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300008

DISTRITOS Y SITIOS DE LA PROVINCIA TEMPLADA SECOESTIVAL NUBOSA O VALPARAÍSO: SECANO DE LA COSTA
Provedor de dados: 127
Autores: Cosio G,Fernando; Negrón B,Mary; Gastó C,Juan; Villate G,Juan Luis.
En la Provincia Templada Secoestival Nubosa o Valparaíso, Secano de la Costa Central, se determinaron y caracterizaron los Distritos y Sitios, mediante el Sistema de Clasificación de Ecorregiones, propuesto por Gastó et al. (1993) y antecedentes adicionales presentados por Silva (1991) y Vallejos (2001), entre otros. La Capacidad de Uso en el área varía de: V en el Distrito Depresional (1,8%), de I a IV en el Distrito Plano (25%), de IV a VI en el Distrito Ondulado (32,4%), de VII a VIII en el Distrito Cerrano (39,6%) y, finalmente, VIII en el Distrito Montano (1,3%). Los Sitios del Distrito Depresional, son en su mayoría profundos con hidromorfismo permanente y alta salinidad-sodio; los Sitios del Distrito Plano son, en general, media-profundo con drenaje...
Tipo: Journal article
Palavras-chave: Distrito geomorfológico; Sitio.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000100004

Divalent cation hinder the solubilization of a tubulin kinase activity from Trypanosoma cruzi epimastigotes
Provedor de dados: 48
Autores: UZCANGA,GRACIELA; GALÁN-CARIDAD,JOSÉ MANUEL; SUAREZ,KAREM NORIS; BUBIS,JOSÉ.
Trypanosoma cruzi epimastigotes were extracted under various conditions in order to examine the role of divalent cations in the solubilization of microtubule proteins. When epimastigotes were homogenized in the presence of 5 mM Mg+2 and 5 mM Ca+2, a protein kinase responsible for phosphorylating tubulin, as well as the tubulin that became phosphorylated, remained tightly associated with the parasite particulate and detergent-resistant fractions. On the contrary, tubulin kinase and its substrate were predominantly released into the parasite cytosolic and detergent-soluble fractions, when epimastigotes were extracted in the presence of 5 mM EDTA and 5 mM EGTA. These evidences demonstrated a divalent cation-dependent solubilization of the enzyme responsible...
Tipo: Journal article
Palavras-chave: Microtubules; Post-translational modification of tubulin; Protein kinase CK2; Protein phosphorylation-dephosphorylation; Signal transduction; Trypanosoma cruzi; Tubulin.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000300008

Divalent cations as modulators of neuronal excitability: Emphasis on copper and zinc
Provedor de dados: 48
Autores: DELGADO,RICARDO; VERGARA,CECILIA; WOLFF,DANIEL.
Based on indirect evidence, a role for synaptically released copper and zinc as modulators of neuronal activity has been proposed. To test this proposal directly, we studied the effect of copper, zinc, and other divalent cations on voltage-dependent currents in dissociated toad olfactory neurons and on their firing rate induced by small depolarizing currents. Divalent cations in the nanomolar range sped up the activation kinetics and increased the amplitude of the inward sodium current. In the micromolar range, they caused a dose dependent inhibition of the inward Na+ and Ca2+ currents (I Na and I Ca) and reduced de amplitude of the Ca2+-dependent K+ outward current (I Ca-K). On the other hand, the firing rate of olfactory neurons increased when exposed to...
Tipo: Journal article
Palavras-chave: Copper; Zinc; Modulators; Channels; Neuronal excitability.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100019

Divergence time estimations and contrasting patterns of genetic diversity between Antarctic and southern South America benthic invertebrates
Provedor de dados: 97
Autores: GONZÁLEZ-WEVAR,CLAUDIO ALEJANDRO; DÍAZ,ANGIE; GERARD,KARIN; CAÑETE,JUAN IVÁN; POULIN,ELIE.
Diversity, abundance and composition of taxonomic groups in the Southern Ocean differ from elsewhere in the planet, since the biogeography in this region reflects the complex interactions of tectonics, oceanography, climate and biological elements since the Eocene. Several groups of marine benthic organisms exhibit high levels of genetic divergence among provinces in this region, supporting the existence of a vicariance process through plate tectonics, while other groups with high dispersive capacity exhibit recent divergence processes. Moreover, the discovery of non-Antarctic decapod larvae in Antarctic Peninsula suggests that some groups can travel across the Antarctic Circumpolar Current. Here we analyzed levels of genetic divergence in congeneric...
Tipo: Journal article
Palavras-chave: Antarctic Circumpolar Current; COI; Oceanographic barrier; Planktotrophy; Pliocene separation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400007

Divergent effects of Nitric oxide on airway epithelial cell activation
Provedor de dados: 48
Autores: Neri,Tommaso; Conti,Ilaria; Cerri,Chiara; Tavanti,Laura; Paggiaro,Pierluigi; Celi,Alessandro.
Nitric oxide (NO*) is a gaseous mediator synthesized by Nitric oxide sinthases. NO* is involved in the modulation of inflammation, but its role in airway inflammation remains controversial. We investigated the role of NO* in the synthesis of the chemok Nes Interleukin-8 and Monocyte Chemotactic Protein-1, and of Intercellular Adhesion Molecule-1 by human airway epithelial cells. normal human bronchial epithelial cells and the bronchial epithelial cell line BEAS-2B were used. Neterleukin-8 (IL-8) and Monocyte Chemotactic Protein-1 (MCP-1) secretion and Intercellular Adhesion Molecule-1 (ICAM-1) expression were measured by ELISA. mRNA was assessed by semiquantitative RTI-PCR. Neterleukin-8 secretion was significantly reduced after 24h incubation with the NO*...
Tipo: Journal article
Palavras-chave: Adhesion molecules; Airway inflammation; Alveolar Epithelium; Chemok Nes; Nitric Oxide.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000400012

Diverse approaches to questions of Biodiversity: German contributions to studies of Marine Benthos around South America and Antartica
Provedor de dados: 72
Autores: Gutt,Julian; Arntz,Wolf E; Balguerias,Eduardo; Brandt,Angelika; Gerdes,Dieter; Gorny,Matthias; Sirenko,Boris.
A look at the latitudinal gradient from North America via South America to Antarctica supports the impression that the ecosystems of this part of the world provide perfect conditions for marine biodiversity studies. Several bilateral or international initiatives with major German contributions have focused on biodiversity questions, especially in South America and Antarctica. At depths &gt; 50 m accessible to shipboard sampling, an oxygen minimum zone (OMZ) prevails off Peru and Chile (except in the extreme south). The macrobenthic biota associated with the OMZ are extremely poor but show a gradient of increasing diversity at great depths and towards the south. In the southern Chilean fjords and channels, habitat heterogeneity is high and differences in...
Tipo: Journal article
Palavras-chave: Marine biodiversity; South America; Antarctica.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200007

DIVERSIDAD BIOQUÍMICA Y MOLECULAR EN FRUTILLAS CHILENAS (Fragaria chiloensis L. Duch.) Y SU IMPLICANCIA EN EL MEJORAMIENTO GENÉTICO DE LA ESPECIE
Provedor de dados: 113
Autores: Becerra V.,Viviana; Paredes C.,Mario; Romero O.,Agnes; Lavín A.,Arturo.
La frutilla chilena (Fragaria chiloensis L. Duch.) es una especie nativa de Chile que fue domesticada antes de la llegada de los españoles. Esta especie es uno de los progenitores de la frutilla cultivada (F. x ananassa) y se encuentra distribuida en una amplia zona del país, colonizando diferentes sistemas agroecológicos. Aparentemente, en estos diversos hábitats se han desarrollado diferentes ecotipos que presentan una gran diversidad de características morfológicas y agronómicas. Los objetivos del trabajo fueron: a) determinar la diversidad genética de una muestra representativa de frutillas chilenas usando marcadores bioquímicos y moleculares; b) comparar la información previamente generada por la amplificación de ADN polimórfico al azar (RAPD) en las...
Tipo: Journal article
Palavras-chave: Isoenzima; Marcador AFLP; Diversidad genética.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000400003

Diversidad de aves y mamíferos marinos en bahía San Pedro, costa de Purranque, centro-sur de Chile
Provedor de dados: 72
Autores: Cursach,Jaime A; Rau,Jaime R; Ojeda,Jaime; Vilugrón,Jonathan; Tobar,Claudio; Oyarzún,Carlos; Soto,Oscar; Suazo,Cristián G.
Entre los años 2007 y 2009, se estudió la diversidad de aves y mamíferos marinos que habitan bahía San Pedro (comuna de Purranque, provincia de Osorno). Evaluamos la composición, diversidad y abundancia de estos vertebrados, que presentó 18 especies de aves marinas, de las cuales Spheniscus magellanicus y Puffinus griseus fueron las más abundantes. Dos especies de pingüinos, una gaviota y un gaviotín se reproducen en la bahía. El ensamble de mamíferos marinos estuvo compuesto por siete especies, de las cuales Otaria flavescens y Lagenorhynchus australis fueron las más abundantes. Una especie de lobo marino y nutria de mar se reproducen en la bahía. Los resultados demuestran el potencial que posee esta bahía para la conservación de biodiversidad marina y el...
Tipo: Journal article
Palavras-chave: Conservación; Huilliche; Manejo costero; Turismo; Vertebrados marinos.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200003

Diversidad de Coleopteros acuáticos en Chile
Provedor de dados: 72
Autores: Jerez,Viviane; Moroni,Juan.
Se entrega para los coleópteros acuáticos, una reseña acerca de la diversidad y riqueza de familias, géneros y especies de los subórdenes Hydradephaga y Polyphaga, presentes en Chile. Hydradephaga está representado por las familias Dytiscidae, Gyrinidae y Haliplidae. Polyphaga por Hydrophilidae, Hydraenidae, Elmidae y Psephenidae. A excepción de Lancetes, que es el género más diversificado con 14 especies, la mayoría de los taxa de ambos subórdenes son monoespecíficos. En relación a aspectos biogeográficos, Chile no presenta familias endémicas. Sin embargo, se han descrito situaciones de endemismo de algunas especies para el Archipiélago de Juan Fernández (Lancetes backstroni, Anisomeria bistriata), e Isla de Pascua (Bidessus skottsbergi). En el continente...
Tipo: Journal article
Palavras-chave: Dytiscidae; Gyrinidae Haliplidae; Hydrophilidae; Hydraenidae; Elmidae; Psephenidae; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100012

Diversidad de hongos micorrícicos arbusculares en maíz con cultivo de cobertura y biofertilizantes en Chiapas, México
Provedor de dados: 73
Autores: Pérez-Luna,Yolanda del Carmen; Álvarez-Solís,José David; Mendoza-Vega,Jorge; Pat-Fernández,Juan Manuel; Gómez-Álvarez,Regino; Cuevas,Laura.
El presente trabajo tuvo como objetivo conocer la densidad, abundancia y diversidad de especies de hongos micorrízicos arbusculares (HMA) asociadas al cultivo de maíz (Zea mays L.) en parcelas que han sido manejadas con bajos ingresos de insumos externos y evaluar su respuesta a la aplicación de abono verde/cultivo de cobertura (AVCC) y biofertilizantes. El trabajo se realizó en siete parcelas de productores de maíz, de las cuales tres han sido manejadas con frijol nescafé (Mucuna deeringiana Merr.) como AVCC y cuatro sin dicho antecedente de manejo. En cada una de las parcelas se establecieron cuatro tratamientos de biofertilización: 1) inoculación con micorriza arbuscular, 2) aplicación de fertilizante orgánico foliar, 3) inoculación con micorriza +...
Tipo: Journal article
Palavras-chave: Micorriza arbuscular; Biodiversidad; Mucuna deeringiana; Zea mays; Agricultura orgánica.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100006

Diversidad de la familia Carabidae (Coleoptera) en Chile
Provedor de dados: 97
Autores: ROIG-JUÑENT,SERGIO; DOMÍNGUEZ,MARTHA C.
Carabidae constituye dentro de los coléopteros chilenos, la cuarta familia en importancia por su cantidad de especies. El presente trabajo incluye una breve compilación acerca de la historia de la familia y de las primeras expediciones realizadas en Chile. También se realizan comparaciones de la diversidad de carábidos chilenos con respecto a otros países y el Neotrópico. Para Chile, se conocen 21 tribus, con 95 géneros y 365 especies, que representan el 38,8, 28,8 y 7,9 % de la fauna del Neotrópico, respectivamente. Chile posee un bajo número de tribus comparado con otros países, sin embargo, constituye un área importante por la presencia de seis tribus relictuales, principalmente pangeicas o gondwánicas. Chile posee 18 géneros endémicos (18,5 % de su...
Tipo: Journal article
Palavras-chave: Carabidae; Chile; Diversidad; Taxa endémicos.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300006

DIVERSIDAD DE LA FAMILIA POACEAE (GRAMINEAE) EN LA REGIÓN DEL BÍO-BÍO, CHILE, BASADA EN COLECCIONES DE HERBARIO
Provedor de dados: 73
Autores: Finot,Víctor L; Marticorena,Clodomiro; Barrera,Juan A; Muñoz-Schick,Mélica; Negritto,María A.
La Región del Bío-Bío se encuentra en la zona sur de Chile central, considerado un hotspot de biodiversidad. Aunque es una región fuertemente intervenida por el hombre, principalmente por la agricultura, la forestación, la industrialización y la urbanización, tiene un bajo porcentaje de superficie protegida por el Sistema Nacional de Áreas Silvestres Protegidas del Estado (SNASPE). Por ello, documentar la biodiversidad de la región es una tarea ineludible. Se analizó la diversidad de la familia Poaceae en la Región del Bío-Bío, a partir de las bases de datos de los herbarios de la Universidad de Concepción (CONC) y del Museo Nacional de Historia Natural (SGO), así como de la literatura taxonómica. Sobre la base de esta información, se preparó una lista...
Tipo: Journal article
Palavras-chave: Riqueza específica; Riqueza estimada; Estimador de riqueza Chao-2; Estimador de riqueza ICE; Curva de acumulación de especies.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200003

DIVERSIDAD DE MACROINVERTEBRADOS ASOCIADOS A ARRECIFES DE PHRAGMATOPOMA MOERCHI KINBERG, 1867 (POLYCHAETA: SABELLARIIDAE) EN EL INTERMAREAL ROCOSO DE COCHOLGÜE, CHILE
Provedor de dados: 72
Autores: Sepúlveda,Roger D.; Moreno,Rodrigo A.; Carrasco,Franklin D.
Las agregaciones monoespecíficas son comunes en el intermareal rocoso. Una de estas especies gregarias es el poliqueto tubícola Phragmatopoma moerchi, el cual construye arrecifes de tamaño variable en el intermareal rocoso. Estos arrecifes proveen de refugio y alimento a muchas especies de invertebrados. El objetivo de este trabajo es caracterizar la macrofauna asociada a estos arrecifes y determinar cómo afecta el tamaño de éstos a algunos parámetros comunitarios. Nueve muestras fueron extraídas del intermareal de Cocholgüe (36° 35'S), entre octubre y diciembre de 2001. En laboratorio, las muestras fueron pesadas y la fauna asociada fue agrupada por taxa y determinada, cuando fue posible, al nivel taxonómico más bajo posible. Luego se obtuvieron los...
Tipo: Journal article
Palavras-chave: Intermareal rocoso; Macrofauna; Biodiversidad; Polychaeta; Phragmatopoma moerchi; Arrecifes.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100007

Diversidad de micromamíferos en tres ambientes de la Reserva Nacional Lago Peñuelas, Región de Valparaíso, Chile
Provedor de dados: 72
Autores: Muñoz-Pedreros,Andrés; Fletcher,Susan; Yáñez,José; Sánchez,Pamela.
Los ecosistemas mediterráneos de Chile, los únicos en Sudamérica de los cuatro presentes en el mundo, son considerados áreas prioritarias para la conservación, por su alta concentración de especies endémicas y las aceleradas tasas de destrucción del hábitat. Éstos contienen más del 39% de las especies de mamíferos, 47% de las especies endémicas y el 65% de las especies amenazadas del país. Aún así, estos ecosistemas están inadecuadamente representados en el sistema de áreas silvestres protegidas, siendo una de ellas la Reserva Nacional Lago Peñuelas (RNLP) parte de la Reserva de Biosfera La Campana-Peñuelas. La mastofauna de la RNLP esta pobremente documentada. Estudiamos la diversidad &amp;#945; y &amp;#946; en el ensamble de micromamíferos presentes en...
Tipo: Journal article
Palavras-chave: Biodiversidad; Mamíferos; Roedores; Chile central.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100003

Diversidad de musgos en ambientes degradados sujetos a restauración en el Parque Nacional Lago Puelo (Chubut, Argentina)
Provedor de dados: 97
Autores: ROVERE,ADRIANA E; CALABRESE,GRACIELA M.
La restauración ecológica es una disciplina que intenta recuperar atributos perdidos en un ecosistema (diversidad de especies, estructura y función). El objetivo de este trabajo fue evaluar la diversidad de musgos y sus formas de vida en tres ambientes con diferentes niveles de degradación y los sustratos en los que estos se desarrollan. El área de estudio corresponde a un sector que se está restaurando dentro de la Reserva Nacional Lago Puelo. En ella se encuentran tres ambientes distintos: (1) área remanente de bosque maduro de Nothofagus dombeyi, (2) bosque secundario de Austrocedrus chilensis, y (3) matorral dominado por especies exóticas. Se recorrió cada uno de los ambientes, registrando los sustratos con musgos, formas de vida y géneros. Los...
Tipo: Journal article
Palavras-chave: Biodiversidad; Briófitas; Conservación; Facilitación; Manejo.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000400009

Diversidad genética y heredabilidad en sentido amplio en agropiro alargado, Thinopyrum ponticum
Provedor de dados: 118
Autores: Pistorale,Susana M; Abbott,Liliana A; Andrés,Adriana.
Diez poblaciones naturalizadas de agropiro alargado (Thinopyrum ponticum) se evaluaron en un ensayo en bloques completamente aleatorizados, con tres repeticiones. Se analizaron, caracteres morfológicos y reproductivos por planta individual y se estimaron parámetros estadísticos y genéticos. Las comparaciones entre medias de las diez poblaciones, mediante la prueba de t, mostraron diferencias significativas (p &lt; 0,001), lo que indica la gran variabilidad existente entre las poblaciones. Los resultados mostraron que los coeficientes de variación ambiental fueron altos para producción de total de semilla (69,24%), número de macollos (54,93%), número de espigas (48,50%) y producción de materia seca (49,01%), y fueron bajos para largo de espiga (19,11%) y...
Tipo: Journal article
Palavras-chave: Agropiro alargado; Correlaciones fenotípicas; Heredabilidad en sentido amplio; Variabilidad genética.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300003

Diversidad isoenzimática en accesiones de Medicago polymorpha colectadas a lo largo del gradiente climático en Chile, y su relación con otras especies de Medicago
Provedor de dados: 97
Autores: PAREDES,MARIO; BECERRA,VIVIANA; CORREA,PILAR; DEL POZO,ALEJANDRO.
Medicago polymorpha es una especie naturalizada en Chile que presenta una gran varaibilidad en características agronómicas, tales como precocidad, producción de semilla, y producción de materia seca, asociada de un gradiente climático. Los objetivos de este trabajo fueron evaluar la diversidad isoenzimática en accesiones de M. polymorpha y su relación con la variabilidad fenotípica, y establecer posibles relaciones genéticas con otras especies de Medicago. Para esto se analizaron 12 sistemas isoenzimáticos en 41 accesiones de M. polymorpha, provenientes de un amplio rango de condiciones edafoclimáticas, y de 16 accesiones de M. arabica, M rotata, M. rigidula, M. tornata, M. littoralis y M. truncatula. Los resultados indicaron una escasa diversidad...
Tipo: Journal article
Palavras-chave: Diversidad genética; Medicago polymorpha; Medicagos anuales; Análisis multivariado.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300011

Diversidad taxonómica y genética del sitio prioritario Península de Hualpén, Región del Bío-Bío, Chile. Implicancias para la conservación
Provedor de dados: 73
Autores: Fuentes,Glenda; Cisternas,Anita; Valencia,Graciela; Mihoc,Maritza; Ruiz,Eduardo; Hasbún,Rodrigo; Valenzuela,Sofía; Baeza,Carlos M.
RESUMEN Dentro de los componentes de la diversidad biológica se encuentran la diversidad taxonómica y genética. El análisis de ambos resulta indispensable para la elaboración de estrategias de manejo y conservación de áreas prioritarias para la conservación. La península de Hualpén alberga uno de los últimos relictos de bosque costero de la Región del Bío-Bío, concentrado en la Estación de Biología Terrestre (EBT) cedida en comodato a la Universidad de Concepción, por parte de la gobernación de Concepción. En este estudio se evaluó la variabilidad taxonómica y genética de la península con el fin de contribuir al desarrollo de estrategias de conservación y futuro desarrollo de planes de manejo en esta. Para ello se cuantificó la riqueza de especies a lo...
Tipo: Journal article
Palavras-chave: Relicto nativo; Riqueza de especies; Variabilidad genética; Conservación.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100094

DIVERSIDAD Y ABUNDANCIA DE COMUNIDADES ZOOPLANCTONICAS LITORALES DEL HUMEDAL PANTANOS DE VILLA, LIMA, PERU
Provedor de dados: 72
Autores: Iannacone,José; Alvariño,Lorena.
Pantanos de Villa es un humedal costero conformado por varios cuerpos de agua, permanentes y estacionales. Este ecosistema es reconocido internacionalmente como sitio RAMSAR y se encuentra ubicado al sur de la zona urbana de Lima, Perú. En junio y octubre de 2004 y en abril del 2005 se llevaron a cabo censos de la biodiversidad y abundancia de las comunidades zooplanctónicas litorales, representando a diferentes cuerpos de agua permanentes en un total de 21 puntos de muestreo. Las muestras de zooplancton fueron colectadas usando una red de plancton de 75mm de diámetro y una apertura de 120 mm, y fueron preservadas empleando una solución de formol azucarado al 4 %. Se determinaron algunos parámetros limnológicos como Oxígeno Disuelto (OD) (mg L-1),...
Tipo: Journal article
Palavras-chave: Cladóceros; Copépodos; Diversidad alfa; Diversidad beta; Limnología; Rotíferos.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100006

Diversidad y biomasa de macro-invertebrados en matrices intermareales del tunicado Pyura praeputialis (Heller, 1878) en la Bahía de Antofagasta, Chile
Provedor de dados: 97
Autores: CERDA,MAURICIO; CASTILLA,JUAN CARLOS.
Se analiza la diversidad biológica y biomasa de macro-invertebrados asociados a los mantos intermareales del tunicado Pyura praeputialis (Heller, 1878) en la Bahía de Antofagasta, donde la especie se encuentra casi exclusivamente confinada a lo largo de aproximadamente 70 km de extensión costera de dicha bahía. En la bahía se seleccionaron tres sitios para el análisis de los mantos de piures: uno localizado aproximadamente en el centro de la distribución del tunicado y dos cercanos a los límites norte y sur (ecotonos) de dicha distribución. La arquitectura de las matrices de piures genera substrato secundario y bio-hábitat que corresponden a los de una especie bio-ingeniera ecosistémica. En las matrices se encontró una diversidad gama de 96 taxa de...
Tipo: Journal article
Palavras-chave: Tunicado; Pyura praeputialis; Intermareal rocoso; Macro-invertebrados; Diversidad; Bio-ingeniero; Antofagasta; Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400011

Diversidad y composición estacional de la escorpiofauna (Arachnida: Scorpiones) del archipiélago Los Choros (Región de Coquimbo, Chile)
Provedor de dados: 72
Autores: PIZARRO-ARAYA,JAIME; OJANGUREN-AFFILASTRO,ANDRÉS A.; LÓPEZ-CORTÉS,FRANCISCO; AGUSTO,PABLO; BRIONES,RAÚL; CEPEDA-PIZARRO,JORGE.
Se estudió la composición taxonómica, la abundancia y la estructura espacial y temporal de la escorpiofauna presente en el archipiélago de Los Choros (Región de Coquimbo, Chile). Se registró la presencia de cuatro especies: Bothriurus coriaceus Pocock 1893, Brachistosternus (Brachistosternus) roigalsinai Ojanguren-Affilastro 2002, Brachistosternus (Brachistosternus) cepedai Ojanguren-Affilastro et al. 2007a (Bothriuridae) y Caraboctonus keyserlingi Pocock 1893 (Caraboctonidae). Se registraron diferencias entre las especies de escorpiones en sus niveles de abundancia total, presencia y abundancia tanto estacional como en los diferentes ambientes pedológicos. El 53,1 % del total de la abundancia correspondió a B. coriaceus, que estuvo presente en ocho de los...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000100007

Diversidad y patrones de distribución de coleópteros en la Región del Biobío, Chile: una aproximación preliminar para la conservación de la diversidad
Provedor de dados: 97
Autores: VERGARA,OLIVIA E; JEREZ,VIVIANE; PARRA,LUIS E.
Los coleópteros, por estar asociados con formaciones vegetales, presentar gran abundancia y diversidad ecológica, rangos de distribución restringidos y alto endemismo, constituyen buenos indicadores de la biodiversidad de un territorio. En la Región del Biobío, área crítica de conservación, estudios sobre la riqueza taxonómica y distribución de coleópteros son muy pocos a pesar de su carácter transicional y de constituir una zona de "puntos calientes" de diversidad a nivel mundial. Nuestros objetivos fueron conocer la composición taxonómica y representatividad regional de coleópteros, determinar sectores con mayor riqueza de especies y relacionar los patrones de distribución de las especies con formaciones vegetales y áreas silvestres protegidas de la...
Tipo: Journal article
Palavras-chave: Insecta; Coleoptera; Formaciones vegetacionales; Áreas Silvestres Protegidas del Estado; Análisis de parsimonia de endemismos (PAE).
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300008

Diversidad y patrones de distribución geográfica de insectos coleópteros en ecosistemas desérticos de la región de Antofagasta, Chile
Provedor de dados: 97
Autores: JEREZ,VIVIANE.
La fauna coleopterológica de la Región de Antofagasta, ha sido objeto de diversos trabajos, pero hasta el momento falta un análisis de conjunto de la diversidad y distribución espacial de las especies. En este trabajo se da a conocer la diversidad de Coleoptera, rangos de distribución de las especies y se analiza las relaciones biogeográficas que pueden existir entre los distintos ecosistemas descritos para la Región. Para ello se elaboró un catastro georreferenciado en base a revisión bibliográfica, material de colección y prospecciones en terreno. La distribución espacial de los taxa se estableció en relación a 11 ecosistemas descritos para la Región y se determinaron áreas de endemismo mediante análisis de parsimonia biogeográfico. La composición...
Tipo: Journal article
Palavras-chave: Coleoptera; Antofagasta; Diversidad; Distribución; Biogeografía; Parsimonia; Ecosistema; Endemismo.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100009

Diversity and distribution of the Aegorhinus genus in the La Araucanía Region of Chile, with special reference to A. superciliosus and A.nodipennis
Provedor de dados: 118
Autores: Zavala,Andrea; Elgueta,Mario; Abarzúa,Juan; Aguilera,Alfonso; Quiroz,Andrés; Rebolledo,Ramón.
The Araucanía region is a berry producing area where important behavioral aspects of species in the genus Aegorhinus, a pest that affects crops, are still unknown. The objectives of this study were to determine the distribution, abundance and richness of these species in agroecological zones of La Araucanía Region and to determine the hosts in which they were found. The sites where these species were found were represented on a map divided into grids of 25 x 25 km. Eight species of Aegorhinus were found in the area, and Aegorhinus nodipennis and Aegorhinus superciliosus were the most abundant. The diversity was analyzed using the Shannon-Wiener index, and the equitability was determined using the Pielou index. The agroecological zone with the greatest...
Tipo: Journal article
Palavras-chave: Aegorhinus; Agroecological zones; Coleoptera; Hosts.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300006

DIVERSITY AND DISTRIBUTION OF THE MOUSE OPOSSUMS OF THE GENUS THYLAMYS (DIDELPHIMORPHIA, DIDELPHIDAE) IN NORTHEASTERN AND CENTRAL ARGENTINA
Provedor de dados: 72
Autores: Teta,Pablo; D'Elía,Guillermo; Flores,David; de La Sancha,Noé.
Phylogenetic analysis of a fragment of the mitochondrial genome and qualitative and quantitative assessments of morphological variation suggest that, in its current conception, Thylamys pusillus (Desmarest, 1804) is a complex of at least three species. In the taxonomic arrangement proposed in this work, the populations in the Argentinean provinces of Entre Ríos and Corrientes are here referred to T. citellus (Thomas, 1912), while the small Thylamys that lives in the Argentinean Dry Chaco are provisionally referred to T.pulchellus (Cabrera, 1934). In our scheme, Thylamys pusillus is restricted to the Bolivian and Paraguayan Chaco and the vicinities of northern Formosa province in A rgentina. We provide emended diagnosis for T. citellus and T. pulchellus,...
Tipo: Journal article
Palavras-chave: Argentina; Mouse opossum; Species limits; Taxonomy.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000200003

Diversity and singularity of the avifauna in the austral peat bogs of the Cape Horn Biosphere Reserve, Chile
Provedor de dados: 118
Autores: Ibarra,José Tomás; Anderson,Christopher B; Altamirano,Tomás A; Rozzi,Ricardo; Bonacic,Cristián.
Sphagnum-dominated peat bogs that are strongly embedded within the southern temperate forest matrix are increasingly being used for agriculture. Nevertheless, little is known about their biodiversity. Moreover, the remote areas of southern Chile where peat bogs are found, such as the Cape Horn Biosphere Reserve (CHBR, 54-55ºS), where birds are the most diverse and best represented group of vertebrates, have not been well-investigated. With the aim to broaden this knowledge in the CHBR, we studied the diversity of the avian assemblage in peat bogs on Navarino Island. We compared the composition of avian species between wetlands with and without peat bogs to test if Sphagnum bogs represented a singular habitat for birds in this area. Furthermore, the 37 bird...
Tipo: Journal article
Palavras-chave: Assemblage; Cape Horn Biosphere Reserve; Navarino Island; Patagonia; Sphagnum spp.; Wetlands.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100003

Diversity, distribution and floral specificity of tangle-veined flies (Diptera: Nemestrinidae) in north west Patagonia, Argentina
Provedor de dados: 97
Autores: DEVOTO,MARIANO; MEDAN,DIEGO.
Tangle-veined flies (Nemestrinidae) constitute a primitive and rather widespread family among Diptera. The genus Trichophthalma occurs in Australia and South America and is the only one in the family with a typically Gondwanian, disjoint distribution. The ecology and distribution of most southern South American species of this genus remains virtually unknown. We studied the diversity, distribution and flower specificity of flower-visiting species of the genus Trichophthalma in the temperate forests of southern South America in ten sites along an east-west rainfall gradient (37-40°S) on the eastern slope of the Andes. We recorded nine species of Trichophthalma, which showed an overlapped distribution along the gradient and different degrees of floral...
Tipo: Journal article
Palavras-chave: Diptera; Nemestrinidae; Trichophthalma; Pollination Patagonia.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000100003

Diversity, dynamics and biogeography of Chilean benthic nearshore ecosystems: an overview and guidelines for conservation
Provedor de dados: 97
Autores: FERNANDEZ,MIRIAM; JARAMILLO,EDUARDO; MARQUET,PABLO A; MORENO,CARLOS A; NAVARRETE,SERGIO A; OJEDA,F. PATRICIO; VALDOVINOS,CLAUDIO R; VASQUEZ,JULIO A.
Despite Chile has been one of the pioneering countries in studies of human impact on marine communities, and despite the enormous economic and social significance that the marine environment has for the country, the development of marine conservation programs and the scientific basis for sustainability has not kept pace, with the exploitation rate of marine fisheries and the increasing use of the coast for other purposes. Although we think that the establishment of any conservation policies along the vast coastline of Chile must be based on a multitude of approaches and considerations, scientific, biological, and ecological principles should guide much of these efforts. In this paper, we attempt to present a general overview of the current knowledge about...
Tipo: Journal article
Palavras-chave: Chile; Marine conservation; Biogeographical patterns; Community structure; Human impact.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400021

DIVERSITY OF ARBUSCULAR MYCORRHIZAL FUNGI IN HORTICULTURAL PRODUCTION SYSTEMS OF SOUTHERN CHILE
Provedor de dados: 126
Autores: Castillo,C; Rubio,R; Borie,F; Sieverding,E.
The diversity of arbuscular mycorrhizal (AM) fungi in six Capsicum annuum or Lycopersicum escuíentum L. horticultural production systems of small farmers, and of two wheat agrosystems was comparatively investigated in Southern Chile (La Araucania). Soils in this region are mostly originated by volcanic ashes which are characterized by high organic matter content and high P-fixing capacity. Arbuscular mycorrhizal fungal symbioses are playing a key role for P uptake by horticultural crops grown there. The objective of this study was to determine AM fungal communities in cropping systems and to identify soil factors affecting their frequency and diversity. Of the totally 32 AM fungal species identified, 5 to 21 AM fungi species were found in horticultural...
Tipo: Journal article
Palavras-chave: Glomeromycetes; Pepper; Ettuce; Agro-ecosystems.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000200002

Diversity of bacterial communities in acid mine drainage from the Shen-bu copper mine, Gansu province, China
Provedor de dados: 69
Autores: Yang,Yu; Shi,Wuyang; Wan,Minxi; Zhang,Yanfei; Zou,Lihong; Huang,Jufang; Qiu,Guanzhou; Liu,Xueduan.
This study presents bacterial population analyses of microbial communities inhabiting three sites of acid mine drainage (AMD) in the Shen-bu copper mine, Gansu Province, China. These sites were located next to acid-leached chalcopyrite slagheaps that had been abandoned since 1995. The pH values of these samples with high concentrations of metals ranged from 2.0 to 3.5. Amplified ribosomal DNA restriction analysis (ARDRA) was used to characterize the bacterial population by amplifying the 16S rRNA gene of microorganisms. A total of 39 operational taxonomic units (OTUs) were obtained from the three samples and sequenced from 384 clones. Sequence data and phylogenetic analyses showed that two dominant clones (JYC-1B, JYC-1D) in sample JYC-1 represented 69.5%...
Tipo: Journal article
Palavras-chave: Acid mine drainage; Amplified ribosomal DNA restriction analysis; Microbial communities.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100001

Diversity of foliar endophytic fungi from the medicinal plant Sapindus saponaria L . and their localization by scanning electron microscopy
Provedor de dados: 48
Autores: García,Adriana; Rhoden,Sandro A; Rubin Filho,Celso J; Nakamura,Celso V; Pamphile,João A.
Endophytic fungi inhabit vegetable tissues or organs, without causing them any harm. Endophytes can co-evolve with plant hosts and possess species-specific interactions. They can protect the plant from insect attacks and diseases, and are also able to produce substances of biotechnological interest. In folk medicine, the bark, roots and fruits of Sapindus saponaria is used to produce substances with anxiolytic, astringent, diuretic and expectorant properties, as well as tonics, blood depuratives and cough medicine. This study evaluated the diversity of endophytic fungi present in the leaves of S. saponaria L. and observed the colonization of host plants by endophytes, using light and scanning electron microscopy. We verified that these fungi are found in...
Tipo: Journal article
Palavras-chave: Endophyte; Light microscopy; Phylogenetic analysis; SEM.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000200006

Diversity of Genetic Resources and Genetic Association Analyses of Green and Dry Chillies of Eastern India
Provedor de dados: 117
Autores: Chattopadhyay,Arup; Baran Sharangi,Amit; Dai,Nuka; Dutta,Subrata.
Chilli (Capsicum annuum L.) is regarded as one of the main commercial vegetable and spice crops at the global level. Maximum diversity can be noted among the cultivars/landraces available in India with respect to shape, size, yield, quality, and other traits. The present experiment was conducted to identify the most promising chilli variety suited for green and dry purposes, to study the genetic variability for different traits and to assess the association of different yield attributing traits with the green and dry yield of chilli. Thirty four genotypes were characterized during a 2-yr period. Most of the genotypes possessed the character constellation of C. annuum. Two genotypes, ‘Chaitali Pointed’ and ‘BC CH Sel-4’ were found most promising with...
Tipo: Journal article
Palavras-chave: Quantitative traits; Qualitative traits; Genetic variability; Heritability; Selection index.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300002

Diversity of marine gliding bacteria in Thailand and their cytotoxicity
Provedor de dados: 69
Autores: Sangnoi,Yutthapong; Srisukchayakul,Pornpoj; Arunpairojana,Vullapa; Kanjana-Opas,Akkharawit.
Eighty-four marine gliding bacteria were isolated from specimens collected in the Gulf of Thailand and the Andaman Sea. All exhibited gliding motility and swarm colonies on cultivation plates and they were purified by subculturing and micromanipulator techniques. Their 16S rRNA genes were amplified by the polymerase chain reaction (PCR) technique. The phylogenetic analysis indicated that the represented isolates can be separated into six different clads (gr 1 - gr 6) within the Cytophaga-Flavobacterium-Bacteriodes (CFB) group. Group 1 formed a remote linear, with only 90% sequence similarity, from Flavobacteriaceae bacterium which indicated a potentially novel taxonomic group. Groups 2 and 3 were identified as the recently proposed Tenacibaculum mesophilum...
Tipo: Journal article
Palavras-chave: Aureispira marina; Aureispira maritime; Fulvivirga kasyanovii; Human cell lines; Rapidithrix thailandica; Tenacibaculum mesophilum.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300003

Diversity of the marine picocyanobacteria Prochlorococcus and Synechococcus assessed by terminal restriction fragment length polymorphisms of 16S-23S rRNA internal transcribed spacer sequences
Provedor de dados: 97
Autores: LAVIN,PARIS; GÓMEZ,PATRICIA; GONZÁLE,BERNARDO; ULLOA,OSVALDO.
In order to assess the appropriateness of the use of internal transcribed spacer (ITS) sequences for the study of population genetics of marine cyanobacteria, we amplified and cloned the 16S rRNA gene plus the 16S-23S ITS regions of six strains of Prochlorococcus and Synechococcus. We analyzed them by denaturing gradient gel electrophoresis (DGGE) and terminal restriction fragment length polymorphisms (T-RFLP). When using the standard application of these techniques, we obtained more than one band or terminal restriction fragment (T-RF) per strain or cloned sequence. Reports in literature have suggested that these anomalies can result from the formation of secondary structures. Secondary structures of the ITS sequences of Prochlorococcus and Synechococcus...
Tipo: Journal article
Palavras-chave: Cyanobacteria; DGGE; T-RFLP; ITS; Secondary structure.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400006

Divide y vencerás: revisión de métodos para la partición de la diversidad regional de especies en sus componentes alfa y beta
Provedor de dados: 97
Autores: PEREYRA,LAURA C; MORENO,CLAUDIA E.
Hace más de medio siglo Robert Whittaker propuso que la diversidad regional (diversidad &amp;#947;) podía ser dividida en dos componentes: &amp;#945; y &amp;#946;. A lo largo de los años surgieron dos formas básicas para relacionar estos tres componentes de la diversidad de especies: un método aditivo y otro multiplicativo. Ambos métodos de partición difieren en sus propiedades, expresiones e interpretaciones, y cada vez son más utilizados para analizar los patrones de diversidad &amp;#945; y &amp;#946; a través de múltiples escalas. Recientemente se han generado contribuciones importantes sobre las propiedades, usos y limitaciones de estos métodos de partición de la diversidad. El propósito de este trabajo es revisar la evolución de los conceptos de...
Tipo: Journal article
Palavras-chave: Diseño jerárquico; Diversidad gamma; Diversidad verdadera; Riqueza de especies; Recambio de especies.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300001

División Alta del Nervio Fibular Superficial: Origen Precoz de los Nervios Cutáneos Dorsales del Pie
Provedor de dados: 77
Autores: Olave,E; Galaz,C; Retamal,P; Cruzat,C.
Los nervios cutáneos dorsales del pie se originan a partir del nervio fibular superficial (NFS), después que éste pasa desde el compartimiento lateral de la pierna a través de la fascia profunda, para luego distribuirse superficialmente en el dorso del pie. A veces, el nervio fibular superficial se divide precozmente, por lo que estos nervios se originan profundamente y con una disposición diferente. Con el propósito de dar a conocer en estos casos, los niveles de origen de los nervios cutáneos dorsales del pie y el punto de penetración en la fascia profunda de la pierna, se estudiaron 16 muestras de individuos, chilenos, adultos, fijadas en formaldehido al 10%. En 2 de ellas, su origen se observó a un nivel alto, cerca de la parte proximal de la fíbula....
Tipo: Journal article
Palavras-chave: Anatomía; Nervio fibular superficial; Pie; Nervios cutáneos dorsales.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200023

DMT1: Which metals does it transport?
Provedor de dados: 48
Autores: GARRICK,MICHAEL D; SINGLETON,STEVEN T; VARGAS,FARIDA; KUO,H-C; ZHAO,LIN; KNÖPFEL,MARTIN; DAVIDSON,TODD; COSTA,MAX; PARADKAR,PRASAD; ROTH,JEROME A; GARRICK,LAURA M.
DMT1 _ Divalent Metal (Ion) Transporter 1 or SLC11A2/DCT1/Nramp2 _ transports Fe2+ into the duodenum and out of the endosome during the transferrin cycle. DMT1 also is important in non-transferrin bound iron uptake. It plays similar roles in Mn2+ trafficking. Voltage clamping showed that six other metals evoked currents, but it is unclear if these metals are substrates for DMT1. This report summarizes progress on which metals DMT1 transports, focusing on results from the authors' labs. We recently cloned 1A/+IRE and 2/-IRE DMT1 isoforms to generate HEK293 cell lines that express them in a tetracycline-inducible fashion, then compared induced expression to uninduced expression and to endogenous DMT1 expression. Induced expression increases ~50x over...
Tipo: Journal article
Palavras-chave: Metal ion transport; DCT1; Nramp2 or SLC11A2; Expression assay; Competition between metal ions.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100009

DNA Checkerboard Method for Bacterial Pathogen Identification in Oral Diseases
Provedor de dados: 77
Autores: Nascimento,Cássio do; Issa,João Paulo Mardegan; Watanabe,Evandro; Ito,Izabel Yoko.
This work aim to show by literature review the principal characteristics of the DNA checkerboard method for bacterial pathogens identification in oral diseases, showing the most varieties uses and applications of this technique
Tipo: Journal article
Palavras-chave: DNA Checkerboard; DNA probes; Microbiology; Bacteria.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500017

DNA damage and related modifier genes in Italian Cystic fibrosis patients
Provedor de dados: 48
Autores: STERPONE,SILVIA; CORNETTA,TOMMASO; ANGIONI,ADRIANO; FISCARELLI,ERSILIA; LUCIDI,VINCENZINA; TESTA,ANTONELLA; COZZI,RENATA.
Cystic Fibrosis (CF) is an autosomal recessive multisystemic disorder showing a highly heterogeneous phenotype, even among siblings carrying identical CFTR mutations. Moreover, oxidative stress is of central importance in the pathogenesis of cystic fibrosis. The present study seeks to value the presence of oxidative damage in CF patients and the possible modifier effect of repair and glutathione-S-transferase genes. We analysed the presence of DNA damage in leukocytes of 63 CF patients at an Italian CF centre and 63 controls, through the alkaline Comet assay to detect DNA strand breaks. Furthermore, controls and 93 CF subjects were genotyped for 5 genes by RFLP-PCR (XRCC1,0GG1,GSTP1) and PCR assay (GSTM1, GSTT1). No difference in Comet assay values was...
Tipo: Journal article
Palavras-chave: Comet assay; Cystic fibrosis; DNA damage; Genetic polymorphisms; Modifier genes.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000400009

DNA demethylation during Chrysanthemum floral transition following short-day treatment
Provedor de dados: 69
Autores: Li,Zhongai; Li,Jie; Yanhua,Liu; Wang,Zicheng.
Background: Analytical techniques such as methylation-sensitive amplification polymorphism and high-performance liquid chromatography were used to detect variation in DNA methylation of mature Chrysanthemum leaves during the floral transition induced by short-day (SD) treatment. Results: For both early- and late-flowering cultivars, the time from the date of planting to the appearance of the capitulum bud and early blooming were significantly shorter than those of the control. The capitulum development of the early-flowering cultivar was significantly accelerated compared to the control, unlike the late-flowering cultivar. The DNA methylation percentage of leaves was significantly altered during flower development. For the early-flowering cultivar, DNA...
Tipo: Journal article
Palavras-chave: Chrysanthemum; DNA; Methylation; Floral transition; Short day.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300009

DNA from tissues of young mice is optimal for genotyping
Provedor de dados: 69
Autores: Picazo,María G; García-Olmo,Dolores C.
Background Genotyping of mice is a common procedure in animal facilities. The aim of this study was to compare the quantity and quality of DNA extracted from samples obtained from young mice (YM; 10 d old) and adult mice (AM; 12 weeks old). We collected samples from the tail and ear of YM and AM. We also sampled blood, check cells (via buccal swabs), hair and fecal pellets of AM, and biopsied distal phalanx of YM. We isolated DNA using commercial kits and determined concentrations and purity by spectrophotometry. The integrity of DNA was evaluated by agarose-gel electrophoresis and polymerase chain reaction (PCR). Results DNA in all samples was amplified successfully but the intensities of bands after electrophoresis was heterogeneous. In general, tissues...
Tipo: Journal article
Palavras-chave: DNA extraction; Genotyping; Mouse.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200004

DNA methylation profile in diffuse type gastric cancer: evidence for hypermethylation of the BRCA1 promoter region in early-onset gastric carcinogenesis
Provedor de dados: 48
Autores: BERNAL,CAROLINA; VARGAS,MACARENA; OSSANDÓN,FRANCISCO; SANTIBÁÑEZ,EUDOCIA; URRUTIA,JULIO; LUENGO,VÍCTOR; ZAVALA,LUIS F; BACKHOUSE,CLAUDIA; PALMA,MARIANA; ARGANDOÑA,JORGE; AGUAYO,FRANCISCO; CORVALÁN,ALEJANDRO.
Diffuse type gastric carcinoma is the most aggressive type of gastric cáncer. This type of tumor is not preceded by precancerous changes and is associated with early-onset and hereditary syndromes. To test the hypothesis that DNA methylation profile would be useful for molecular classification of the diffuse type gastric carcinoma, DNA methylation patterns of the CpG Island of 17 genes were studied in 104 cases and 47 normal adjacent gastric mucosa by Methylation-specific PCR, Immunohistochemistry and Hierarchical clustering analysis. The most frequent methylated genes were FHIT, E-cadherin, BRCA1 and APC (&gt;50%), followed by pl4, pl6, pl5, p73, MGMT and SEMA3B (20-49%). Hierarchical clustering analysis reveáis four groups with different clinical...
Tipo: Journal article
Palavras-chave: Gastric cáncer; Diffuse type; Early-onset; BRCA-1.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000300007

DNA removal from a purification process of recombinant hepatitis B surface antigen
Provedor de dados: 69
Autores: Beldarraín Iznaga,Alejandro; Candelario Frontera,Mayda; Rodríguez Uramis,Javier; Tejera González,José Blas; Calvo Parra,Yodelis; Madruga González,Yoel.
We studied the capacity of an API-rHBsAg purification process to eliminate DNA contamination from yeast-host cell. Firstly, was demonstrated consistency of manufacturing purification process to remove DNA, from (3.9 ± 1.9)10(8) pg/dose in starting material to (3.4 ± 1.6) pg/dose, equivalent to 8.2 log in Active Pharmaceutical Ingredient (API), measuring DNA quantity in several unit operations along manufacturing process for twenty batches, five consecutive in 2000, 2001, 2003 and 2005. These values for API, lower than 10 pg/dose, accomplish current WHO requirements for Hepatitis B vaccines obtaining by recombinant DNA technology (&lt;a href="#36"&gt;WHO, 1989&lt;/a&gt;; &lt;a href="#3"&gt;European Pharmacopoeia, 2001a&lt;/a&gt;). The main removal factor...
Tipo: Journal article
Palavras-chave: DNA-clearance factor; Process characterization; RHBsAg purification process; Spiking experiments.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100004

DNA Repair Genes XRCC1, XRCC3, XPD, and OGG1 Polymorphisms among the Central Region Population of Saudi Arabia
Provedor de dados: 48
Autores: Alanazi,Mohammad; Pathan,Akbar Ali Khan; Ajaj,Sana Abdulla; Khan,Wajahatullah; Shaik,Jilani P; Al Tassan,Nada; Parine,Narasimha Reddy.
DNA repair is one of the central defense mechanisms against mutagenic exposures. Inherited SNPs of DNA repair genes may contribute to variations in DNA repair capacity and susceptibility to cancer. Due to the presence of these variants, inter-individual and ethnic differences in DNA repair capacity have been established in various populations. Saudi Arabia harbors enormous genetic and cultural diversity. In the present study we aimed to determine the genotype and allele frequencies of XRCC1 Arg399Gln (rs25487), XRCC3 Thr241Met (rs861539), XPD Lys751Gln (rs13181), and OGG1 Ser326Cys (rs1052133) gene polymorphisms in 386 healthy individuals residing in the central region of Saudi Arabia and compare them with HapMap and other populations. The genotype and...
Tipo: Journal article
Palavras-chave: DNA Repair genes; Polymorphism; Saudi population; XRCC1; XRCC3; OGG1; XPD.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000200007

DNA sequence variation of drought-response candidate genes in Austrocedrus chilensis
Provedor de dados: 69
Autores: Pomponio,María F; Torales,Susana; Gallo,Leonardo A; Pastorino,Mario J; Marchelli,Paula; Cervera,María Teresa; Poltri,Susana Marcucci.
Background: Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri commonly known as Patagonian cypress is a member of the Cupressaceae family, characterized by a high adaptive potential for growing in marginal areas and good timber quality. The species grows over a wide area and under a wide range of rainfall. This study assessed adaptive genetic variation at SNP level in candidate genes involved in response to drought stress. Results: A total of 18 single nucleotide polymorphisms (SNPs) were found among 1,428 bp. Average nucleotide diversity value (&amp;#960; = 0.00312) was similar to those previously reported in other Cupressaceae. The Fst average among genes and populations was 0.163 and the lowest differentiation was observed in continuous and humid...
Tipo: Journal article
Palavras-chave: Adaptive variation; Balancing selection; Patagonian cypress; Single nucleotide polymorphisms (SNPs).
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000200003

Do pollinators respond in a dose-dependent manner to flower herbivory?: An experimental assessment in Loasa tricolor (Loasaceae)
Provedor de dados: 73
Autores: CARES-SUÁREZ,ROXANA; POCH,TOMÁS; ACEVEDO,ROMINA F; ACOSTA-BRAVO,IGNACIO; PIMENTEL,CAROLINA; ESPINOZA,CLAUDIA; CARES,ROCÍO A; MUÑOZ,PAOLA; GONZÁLEZ,ALEJANDRA V; BOTTO-MAHAN,CAREZZA.
Pollinators are able to discriminate among different floral phenotypes. Thus, flowers more attractive to pollinators usually receive more visits to their reproductive structures. However, this effect of attraction does not necessarily occur in a binary way, all-or-nothing. Loasa tricolor KerGawl. is an annual herb covered with stinging hairs. Flowers present a corolla with five yellow petals and red nectarine scales. In this study, we assess whether the variation in the floral phenotype of L. tricolor affects discrimination by pollinators, following a dose-dependent type of response. This study was carried out in a protected area of Chile where L. tricolor shows high levels of florivory, probably affecting its attraction to pollinators. We experimentally...
Tipo: Journal article
Palavras-chave: Flower herbivory; Pollination; Visitation rate; Florivory.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200007

Doble Inervación del Músculo Braquial en la Población Chilena
Provedor de dados: 77
Autores: Molina,Claudio; Uribe,Cristián; Heras,Álvaro; Astorga,Cristián; Lemus,Jorge; Rodríguez,Alberto.
La doble inervación del músculo braquial está dada por el nervio musculocutáneo y por ramos provenientes del nervio radial según lo describen algunos textos anatómicos y numerosos trabajos científicos. Sin embargo, no existe consenso en la frecuencia con la que ésta se presenta. El objetivo de este estudio es verificar la presencia y determinar la frecuencia de la contribución del nervio radial en la inervación del músculo braquial. En el presente trabajo se utilizaron 30 miembros superiores previamente fijados con solución fijadora y conservadora. Se realizó disección de la región braquial para determinar la presencia de ramos del nervio radial inervando al músculo braquial, verificando la presencia de ramos que penetraban en el músculo y tomando muestras...
Tipo: Journal article
Palavras-chave: Músculo Braquial; Nervio Radial; Plexo Braquial.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400023

DOES BURNING OF HARVESTING RESIDUES INCREASE SOIL CARBON STORAGE?
Provedor de dados: 127
Autores: Rumpel,Cornelia.
The influence of 31 years of stubble burning on the carbon storage as well of chemical composition of soil organic matter (SOM) was studied in agricultural soil of a long-term field experiment. Additionally, the potential of black carbon (BC) produced by burning of harvesting residues, to be lost by horizontal as well as vertical transport was quantified during a rainfall simulation experiment. Our results show that 31 years of stubbie burning as a regular agricultural practice did not change carbon storage or the chemical composition of SOM. This is most likely due to a small quantitative input of highly stable aromatic carbon into the soil. A significant portion of BC deposited on the soil surface by the fire may have been exported from the site as shown...
Tipo: Journal article
Palavras-chave: Black carbon; Stubble burning; Soil organic C.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000200006

Does Cimicifuga racemosa have the effects like estrogen on the sublingual gland in ovariectomized rats?
Provedor de dados: 48
Autores: Da,Yun&amp;#8209;Meng; Niu,Kai&amp;#8209;Yu; Liu,Shu&amp;#8209;Ya; Wang,Ke; Wang,Wen&amp;#8209;Juan; Jia,Jing; Qin,Li&amp;#8209;Hua; Bai,Wen&amp;#8209;Pei.
Abstract  Background Cimicifuga racemosa is one of the herbs used for the treatment of climacteric syndrome, and it has been cited as an alternative therapy to estrogen. Apart from hectic fevers, dyspareunia and so on, dry mouth also increase significantly after menopause. It has not yet been reported whether C. racemosa has any impact on the sublingual gland, which may relate to dry mouth. In an attempt to determine this, we have compared the effects of estrogen and C. racemosa on the sublingual gland of ovariectomized rats.  Results  HE staining showed that the acinar cell area had contracted and that the intercellular spaces were broadened in the OVX (ovariectomized rats) group, while treatment with estradiol (E2) and iCR (isopropanolic extract of C....
Tipo: Journal article
Palavras-chave: Estradiol; Cimicifuga racemosa; Sublingual gland; Subcellular structure; Caspase-3.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100209

Does Diabetes Alter Immunolocalization of Galectin-1 and Galectin-3 in the Rat Ovary?
Provedor de dados: 77
Autores: Özdenoglu,Berna; Saraydin,Serpil Ünver.
Diabetes mellitus (DM), is a metabolic disease occurring via insulin secretion deficiency from the pancreas and/or an insufficiency of tissue response to insulin. The present study is intended to show of immunolocalizations of beta-galactose-binding proteins Galectin-1 and Galectin-3 in diabetic rat ovarium and their relationship with diabetes. In this study, 8 to 10-week-old, 250­300 g weighing 50 mature female rats were used, in order to establish diabetes mellitus in those animals, 60 mg/kg intravenous streptozotocin was injected to each animal. After death, diabetics and non-diabetics rats's routine tissue processing steps is done to rat ovarial tissues for immunohistochemical investigation. Strong expressions of Galectin-1 and Galectin-3 were observed...
Tipo: Journal article
Palavras-chave: Galectin-1; Galectin-3; Ovary; Diabetes; Rat.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200050

Does disturbance determines the prevalence of dwarf mistletoe (Arceuthobium, Santalales: Viscaceae) in Central Mexico?
Provedor de dados: 97
Autores: QUEIJEIRO-BOLAÑOS,MÓNICA E; CANO-SANTANA,ZENÓN; CASTELLANOS-VARGAS,IVÁN.
Large vegetation disturbance rates have been reported in the "Zoquiapan y Anexas" Protected Natural Area in Central Mexico. Arceuthobium globosum and A. vaginatum coexist within this area and have a deleterious impact on Pinus hartwegii. This study seeks to understand the relationship between this disturbance and the two dwarf mistletoe species prevalent in this zone. Twenty-four plots measuring 60 x55 m containing P. hartwegii trees were selected. Within these plots, the physical features of the land, the density of host and non-host trees, the prevalence of each mistletoe species, and six disturbance indicators were recorded. We found that A. vaginatum infests up to 47 % of P hartwegii trees and that its prevalence is affected positively by the slope,...
Tipo: Journal article
Palavras-chave: Disturbance indicators; Interactions; Logging; Parasitic plants; Pinus hartwegii.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000200007

Does the presence of livestock alter the trophic behaviour of sympatric populations of wild camelids Vicugna vicugna Molina 1782 and Lama guanicoe Müller 1976 (Artiodactyla: Camelidae)?: Evidence from Central Andes
Provedor de dados: 72
Autores: TIRADO,CARLOS; CORTÉS,A.; CARRETERO,M. A.; BOZINOVIC,FRANCISCO.
We described and compared the diets of two sympatric Andean camelids, during the humid season (austral summer) in a site of Northern Chile, in presence of domestic livestock. Results indicate that: 1) grasses and shrubs are the main component in the diet of both camelids, 2) shrubs were more consumed by V. vicugna; 3) V. vicugna and L. guanicoe used the same trophic resources but in different proportions; 4) in mountain environments, wetlands exploitation by wild camelids seems restricted by domestic cattle, which would cause the displacement of Vicuñas and Guanacos to suboptimal habitat for feeding.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100004

Does the use of Testosterone Enanthate as a Form of Doping in Sports Cause Early Closure of Epiphyseal in Bones?
Provedor de dados: 77
Autores: Lok,Sefa.
The purpose of this research is to investigate the morphometric effects of short term usage of testosterone enanthate among the anabolic androgenic steroids used as doping by athletes on humerus bones of male rats. 30 rats (35 days) were utilized in this research. The rats were divided into three equal groups. For the experimental group (n= 10), testosterone enanthate at 10 mg/kg dose in 100 µl peanut oil diluents, for the peanut oil group (n= 10), peanut oil of testosterone enanthate' diluent (100 µl) was executed intraperitoneally 5 days in a week for 3 weeks. The control group (n= 10) was nourished without any practice for 3 weeks. All rats were euthanized end of the research. Humerus bones were exposed by the dissection of rats' front extremite bones...
Tipo: Journal article
Palavras-chave: Sport; Doping; Testosterone enanthate; Bone; Humerus; Morphometry.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400001

DOLLINCO-INIA: TRIGO ALTERNATIVO PARA EL SUR DE CHILE
Provedor de dados: 113
Autores: Hewstone M.,Cristian; Jobet F.,Claudio.
Dollinco-INIA es un trigo de pan (Triticum aestivum L), semienano, de hábito de desarrollo alternativo, obtenido por el Proyecto de Fitomejoramiento del Instituto de Investigaciones Agropecuarias (INIA), Centro Regional de Investigación Carillanca, Temuco. Es moderadamente susceptible a polvillo estriado, resistente a polvillo de la hoja y moderadamente resistente a septoriosis y oidio. Su rendimiento promedio en ensayos en cuatro temporadas ha fluctuado entre 7,84 y 14,46 t ha-1 en tres localidades de la zona sur. Es un trigo para panificación directa, con alta cifra de sedimentación (55,8) y buen volumen de pan (749 cm³).
Tipo: Journal article
Palavras-chave: Trigo alternativo; Rendimiento; Calidad.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100013

Domestication through the Centuries: Darwin’s Ideas and Dmitry Belyaev’s Long-Term Experiment in Silver Foxes
Provedor de dados: 72
Autores: Bidau,Claudio J.
The problem of the origin of domestic animals and plants, and the means by which they were produced along human history, were of deep interest to Charles Darwin who considered domestic breeding ‘one grand experiment’ in evolution. In frst place, he elaborated an analogy between artifcial selection, by which breeders obtained desired characters in domestic species, and natural selection, the powerful force driving evolution in nature. At the same time, Darwin distinguished two processes within artifcial selection: methodical and unconscious selection. He attached great importance to the latter since it could produce gradual unexpected changes in association with those characters that were consciously selected for. Although the analogy natural/artifcial...
Tipo: Journal article
Palavras-chave: Artifcial selection; Destabilizing selection; Unconscious selection; Tameness; Vulpes vulpes.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000300006

Donepezil reverses buprenorphine-induced central respiratory depression in anesthetized rabbits
Provedor de dados: 48
Autores: SAKURABA,SHIGEKI; TSUJITA,MIKI; ARISAKA,HIROFUMI; TAKEDA,JUNZO; YOSHIDA,KAZUICHI; KUWANA,SHUN-ICHI.
Buprenorphine is a mixed opioid receptor agonist-antagonist used in acute and chronic pain management. Although this agent's analgesic effect increases in a dose-dependent manner, buprenorphine-induced respiratory depression shows a marked ceiling effect at higher doses, which is considered to be an indicator of safety. Nevertheless, cases of overdose mortality or severe respiratory depression associated with buprenorphine use have been reported. Naloxone can reverse buprenorphine-induced respiratory depression, but is slow-acting and unstable, meaning that new drug candidates able to specifically antagonize buprenorphine-induced respiratory depression are needed in order to enable maximal analgesic effect without respiratory depression. Acetylcholine is...
Tipo: Journal article
Palavras-chave: Buprenorphine; Donepezil; Rabbit; Respiratory depression; Cholinesterase inhibitor.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000400008

Don't camp beside the river: structure and dynamics of Andean alder (Alnus acuminata) forests affected by river floods, northwestern Argentina
Provedor de dados: 97
Autores: EASDALE,TOMÁS A; SABATÉ,SEBASTIÁN; GRAU,ALFREDO.
Alnus acuminata (Betulaceae) is a pioneer tree that dominates mountain riparian forests throughout the eastern Andes. Early studies associated these forests with particular microclimatic conditions along river beds, but they were later linked to the periodical disturbance regime of mountain rivers. To understand the dynamics of these forests, we analysed tree age and spatial arrangement in two plots along Potrero river and another plot along La Horqueta river, Tucumán Province, north west Argentina. Through intensive tree coring and age reconstruction we identified similar-aged tree cohorts with maximum age ranges of eight years. Tree mapping and Moran's I spatial autocorrelation analysis showed that tree cohorts were spatially clumped, and provided...
Tipo: Journal article
Palavras-chave: Alnus acuminata; River floods; Riparian forests; Forest dynamics; El Niño/ENSO.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400010

Dopamine Receptors Gene Expression in Male Rat Hippocampus after Administration of MDMA (Ecstasy)
Provedor de dados: 77
Autores: Simin,Mahakizadeh; Mehrdad,Jahanshahi; Kamran,Haidari; Majid,Shahbazi.
Ecstasy is one of the most popular amusing drugs among young people. Documents indicate some effects of Ecstasy on hippocampus and close relations between dopaminergic functions with reward learning. Therefore, the aim of this study was evaluation of the chronic effects of Ecstasy on memory in male Wistar rats and determination of dopamine receptors' gene expression in hippocampus. Forty adult male Wistar rats randomly distributed in five groups: Control, sham (received 1 ml/kg 0.9% saline) and three experimental groups were: Exp. 1 (2.5 mg/kg), Exp. 2 (5 mg/kg), and Exp. 3 (10 mg/kg) received MDMA intraperitoneally once every 7 days (3 times a day, 3 hours apart) for 4 weeks. Before the first injection animals trained in Shuttle Box memory and tested...
Tipo: Journal article
Palavras-chave: MDMA; Dopamine Receptors; Gene expression; Hippocampus; Rat.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100048

Dorello´s Canal or Abducens Nerve Canal: Constancy or Inconstancy?
Provedor de dados: 77
Autores: Duque Parra,Jorge Eduardo; Barco Ríos,John; Mendoza Zuluaga,Julián.
Dorello´s canal is an eponym term referring to a small fibro osseous landmark, by way of arc, located at the apex of the petrous temporal region and for which the nerve abducens passes before reaching the cavernous sinus. This landmark is not referenced in Terminologia Anatomica, even as a variable structure. We selected 74 adult dry skulls and six heads fixed in formalin 10 % without classifying them by ethnicity or gender. As inclusion criteria, we selected those where the middle cranial fossa and the apex of the petrous temporal region were in good condition. Fifty seven (57) skulls (83, 82 %) showed the presence of canal bilaterally; 4 (5.89 %) showed it unilaterally to the right; 4 (5,89 %) were unilaterally at the left and 3 (4,41 %) had no canal....
Tipo: Journal article
Palavras-chave: Petrous temporal region; Apex; Canal; Abducens nerve; Terminology.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100038

Dorsal Digital Branch of the Thumb: An Anatomical Study
Provedor de dados: 77
Autores: Verma,Ranjana; Paul,Shipra; Das,Srijit.
The level of origin of digital branch to thumb (DBT) of superficial branch of radial nerve (SBRN) and its relationship to brachioradialis muscle tendon (BRT) and its fascial sheath (FS) were studied on both sides of upper extremities of 50 cadavers (n=100). The DBT of SBRN originated in the middle third of forearm in 3 cases (3%), distal third of forearm in 10 cases (10%) and in wrist and dorsum of hand in 87 cases (87%). All cases having origin in the middle third of forearm and half of the cases having origin in the distal third of forearm were closely related to BRT or its FS. The clinical importance of the study lies in the fact that the DBT supplies dorsum of the thumb and first web space which has least cutaneous overlapping. Any injury or entrapment...
Tipo: Journal article
Palavras-chave: Radial nerve; Superficial branch; Digital branch; Thumb; Brachioradialis tendon.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200007

Dos especies nuevas dedicadas al Dr. Patricio Sánchez R
Provedor de dados: 97
Autores: CASTILLA,JUAN C.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400009

Dos nuevos registros de ascidias (Tunicata: Ascidiacea) para la costa continental de Chile
Provedor de dados: 97
Autores: CLARKE,MARCELA; CASTILLA,JUAN CARLOS.
Las ascidias (Tunicata: Ascidiacea) Asterocarpa humilis (Heller, 1878) (Styelidae) y Molgula ficus (Macdonald, 1859) (Molgulidae) se registran por primera vez, para la costa de Chile continental. Los ejemplares se recolectaron en los años 1997 y 1998 en tres localidades en los alrededores de la Bahía de Antofagasta, Chile (23º43´S; 70º 26´W), asociados a las agrupaciones de las ascidias Pyura chilensis Molina, 1872 y Ciona intestinalis Linnaeus, 1767, que se fijan en sistemas suspendidos de cultivo de ostiones y en mantos intermareales del «piure de Antofagasta», P. praeputialis (Heller, 1878). En el trabajo se describen las especies y se discuten sus distribuciones geográficas y la posibilidad que ambas hayan sido introducidas o invadido costas de Chile....
Tipo: Journal article
Palavras-chave: Ascidias; Chile; Styelidae; Molgulidae.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300014

Double Inferior Vena Cava Detected by CT Venography and Confirmed by Magnetic Resonance Venography: Embryogenesis and Literature Review
Provedor de dados: 77
Autores: Hadidi,Maher T; Badran,Darwish H; Ghaida,Jamal Abu; shatarat,Amjad T; Al-Hadidy,Azmy M; Tarawneh,Emad.
A hospital based prospective study was conducted from July 2001 to July 2015 at the Department of Radiology, Jordan University Hospital, Amman, Jordan. During that period, five cases of double inferior vena cava (DIVC) were discovered among a cohort of 7722 patients (3861 men and 3861 women, 49.5±16.9 years, range 16­78 years). Cases were diagnosed by contrast-enhanced Spiral CT venography (CTV) and confirmed by turbo three-dimensional (3D) time-of-flight contrast-enhanced MR venography. The majority of patients 3166 (41 %) were referred for staging and follow-up of malignancy, postoperative complications 1777 (23 %), non-specific abdominal pain 1467 (19 %), preoperative assessment 849 (11 %) and trauma 463 (6 %). Magnetic resonance venography showed...
Tipo: Journal article
Palavras-chave: Magnetic resonance angiogram; Inferior vena cava; Congenital anomalies.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300044

Double Non Coronary Aortic Sinuses: An Autopsy Case Finding Showing the Arterial Variation
Provedor de dados: 77
Autores: Raghavendra Babu,Y.P; Murlimanju,B.V; Kumari Sahu,Kausalya; Gupta,Kanika; Saralaya,Vasudha V.
We report a case of variant origin of the right coronary artery from the left posterior aortic sinus. This was observed routinely during a medico legal autopsy of a 58 year old male who died in a road traffic accident. Initially it was believed that the right coronary artery was absent since there was no obvious right coronary artery ostium from the anterior aortic sinus. However it was found later that the right coronary ostium was present just beside the left coronary ostium in the left posterior aortic sinus and the right coronary artery was arising from the left posterior aortic sinus. The right coronary artery had an intramural course between the aorta and pulmonary trunk, which is considered as very dangerous and life threatening. We believe that the...
Tipo: Journal article
Palavras-chave: Aortic Sinus; Coronary Artery Ostium; Right Coronary Artery; Left Coronary Artery.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300054

Double Plantaris Muscle: A Cadaveric Study with Clinical Importance
Provedor de dados: 77
Autores: Rana,Kum Kum; Das,Srijit; Verma,Ranjana.
The gastrocnemius, plantaris and the soleus muscles, comprise the posterior (flexor) compartment muscles of the leg. The plantaris muscle is responsible for causing plantar flexion of the foot. The muscle is vestigial in human beings and has much clinical importance. The muscle is known to exhibit variations but there are few reports on the existence of double plantaris muscle. The present case report describes double plantaris on both sides of a cadaver, which was detected during routine dissection. Knowledge of both normal and abnormal anatomy of the plantaris muscle is important for surgeons performing tendon transfer operations and clinicians diagnosing muscle tears
Tipo: Journal article
Palavras-chave: Plantaris muscle; Anatomical variation.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400032

Double purpose wheat: correlation analysis of forage yield components
Provedor de dados: 118
Autores: Morant,Alicia; Merchán,Héctor; Lutz,Eugenio.
The direct and relative contribution of characters associated with forage production were evaluated in a comparative assay of wheat cultivars to contribute to an ideotype defnition when selecting double purpose material for forage and grain production. Simple correlations for all of the possible combinations among the measured variables were calculated. The correlation partition method, known as path coeffcient, was applied to determine the causes of this association and to measure the relative importance of each factor. Forage production during the vegetative period was measured for each variety at the dates in which the apex reached the double ridge state (3 - 4 in the Nerson scale). The double ridge state was considered the deadline of the vegetative...
Tipo: Journal article
Palavras-chave: Correlation; Forage yield; Path coeffcient analysis; Triticum; Yield components; Wheat.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100005

Double Root Anatomical Variations in a Single Patient: Endodontic Treatment and Rehabilitation of a Three-rooted First Premolar. Case Report
Provedor de dados: 77
Autores: Oporto V,Gonzalo H; Saavedra,Rubén; Soto P,Camila C; Fuentes,Ramón.
Abnormal interaction between oral epithelium and underlying mesenchematic tissue during odontogenesis could result in teeth with an anatomical variation. First maxilar premolar has such variable root canal morphology. However, (0.2-6% of cases) a three-rooted premolar is particularly uncommon. First mandibular premolar frequently has one root and one single canal (75% of cases), however, a tooth with two canals and two separate roots could be found (19.5-22.5%). Execution of an accurate diagnosis of root canal system is essential to perform a successful endodontic treatment and tooth rehabilitation. This article describes diagnosis, endodontic treatment and rehabilitation (means single crown) of a maxillary three-rooted and three-canal first premolar, and...
Tipo: Journal article
Palavras-chave: Anatomical variation; Root canal; Teeth root; Teeth endodontically treated; Premolar; Crown.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100006

Downward fluxes of particulate organic matter in coastal and oceanic areas off Chile: The role of the OMZ and functional groups of the plankton
Provedor de dados: 72
Autores: González,H E; Daneri,G; Menschel,E; Marchant,M; Pantoja,S; Hebbeln,D; Barria,C; Vera,R; Iriarte,J.
Vertical fluxes of particles have been estimated during the last decade in coastal and oceanic systems off central-southern Chile. Free-drifting, cylindrical sediment traps have been deployed below the mixing layer from coastal areas, while automatic, cone-shaped sediment traps have been anchored in deep oceanic areas. Vertical fluxes toward 2300 m depth off Coquimbo were dominated by calcium carbonate (~70 mg m-2 d-1) instead of particulate organic carbon (POC ~7 mg m-2 d-1), where foraminifers (Neogloboquadrina pachyderma) and faecal pellets of Euphausia mucronata and Oikopleura spp, played important roles as vehicles for carbonate and carbon, respectively. In coastal upwelling systems, (i. e. Concepción), the dominant vertical flux was POC, mainly...
Tipo: Journal article
Palavras-chave: Particulate organic matter; Fluxes; Oxygen minimum zone; Zooplankton functional groups; Sediment traps; Central Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300007

DR. JORGE ALLENDE NUEVO MIEMBRO DE LA ACADEMIA DE CIENCIAS DE ESTADOS UNIDOS
Provedor de dados: 48
Autores: ORELLANA,OMAR.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000200004

Dr. Rafael Vicuña: Miembro de Número de la Pontificia Academia de Ciencias del Vaticano
Provedor de dados: 48
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000300003

Dragonfly Genera of the New World: an illustrated and annotated key to the Anisoptera
Provedor de dados: 97
Autores: PESSACQ,PABLO.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000100012

Drenaje de las Venas Facial, Lingual y Tiroidea Superior en el Hombre
Provedor de dados: 77
Autores: Gusmão,Luiz Carlos Buarque; Sousa-Rodrigues,Célio Fernando de; Gonzalez da Nóbrega,Fabiana Sophia; Pereira da Silva,Lígia Maria Teixeira.
La gran diversidad de descripciones acerca de las afluencias de las venas facial, lingual y tiroidea superior en el hombre, estas presentan una serie de controversias entre los autores investigados. Buscando ofrecer un patrón para la formación de troncos venosos a partir de las referidas venas, los autores realizaron la disecación de 42 faces laterales del cuello de cadáveres humanos adultos, de ambos sexos, con edades variadas y fijados en formaldehido a 10%. Se observó la formación de troncos venosos en 59,5% de los casos, habiendo ocurrido formación del tronco tiroilingofacial en 38,1%, del tronco lingofacial en 14,2%, del tronco tiroilingual en 4,8% y del tronco tiroilingofaringofacial en apenas 2,4%. No fue encontrada la formación del tronco...
Tipo: Journal article
Palavras-chave: Vena facial; Vena lingual; Vena tirodea superior; Anatomía; Drenaje venoso.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500028

Drought and leaf damage limit the search for support in the climbing plant Ipomoea purpurea (L.) Roth (Convolvulaceae)
Provedor de dados: 73
Autores: ATALA,CRISTIAN; CORDERO,CRISTIAN; GIANOLI,ERNESTO.
There is evidence that some climbing plants increase their twining rate after leaf damage, thus avoiding ground herbivores, and that drought limits this induced response. However, it is unknown whether leaf damage and drought affect the search for support, an ecologically relevant process for climbing plants. We evaluated the combined effect of drought and leaf damage on support searching in the twining vine Ipomoeapupurea (Convolvulaceae). Plants were assigned to a combination of three watering treatments (regular watering, moderate drought, and severe drought) and two damage treatments (control and 50% defoliation). We placed a stake at 15 cm from the stem and recorded the time to successful twining (360° turn). We also measured some plant functional...
Tipo: Journal article
Palavras-chave: Support searching; Drought; Leaf damage; Ipomoea purpurea.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200011

DROUGHT LIMITS INDUCED TWINING BY LEAF DAMAGE IN THE CLIMBING PLANT IPOMOEA PURPUREA (L.) ROTH (CONVOLVULACEAE)
Provedor de dados: 73
Autores: Atala,Cristian; Gianoli,Ernesto.
The environment may limit the expression of induced responses to herbivory, such as increased chemical or physical defenses. Recent studies in climbing plants have shown that leaf damage induces twining. This response may confer protection against ground herbivores in the field. We addressed the effect of drought on the induced twining of the annual vine Ipomoea purpurea (Convolvulaceae), which can experience drought stress in natural conditions. In a greenhouse experiment, we recorded twining rate (proportion of plants successfully climbing at a given time) of damaged and undamaged individuals of I. purpurea subjected to control watering and water shortage treatments. We also estimated stem growth rate and stem water content in experimental plants, just...
Tipo: Journal article
Palavras-chave: Induced responses; Drought; Ipomoea purpurea; Resource limitation; Herbivory.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200005

Drought Tolerance in Recombinant Chromosome Substitution Lines (RCSLs) Derived from the Cross Hordeum vulgare subsp. spontaneum (Caesarea 26-24) × Hordeum. vulgare subsp. vulgare cv. Harrington
Provedor de dados: 113
Autores: Inostroza,Luis; del Pozo,Alejandro; Matus,Iván; Hayes,Patrick.
Grain yield (GY) and drought tolerance of recombinant chromosome substitution lines (RCSLs) derived from the cross between Hordeum vulgareL.subsp. spontaneum (K. Koch) Thell. and H. vulgare L. subsp. vulgare cv. Harrington, were studied in two contrasting environments, one with water stress (WWS) and the other with no water stress (NWS), during three growing seasons, 2004-2005, 2005-2006 and 2006-2007. In the first season 80 RCSLs were sowed and in the following a selection of 13 RCSLs. An a-lattice design was used in all the experiments. With the data of GY obtained in sites WWS and NWS it was calculated the drought sensitivity index (DSI). During 2004-2005 growing season GY varied greatly among locations, reflecting differences in water availability. The...
Tipo: Journal article
Palavras-chave: Barley; Drought sensitivity index; Grain yield water stress; Genotype.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000300004

Dry deposition of nitrogen to passive samplers in grassland and forest canopies in the Central depression of southern Chile
Provedor de dados: 73
Autores: Godoy,Roberto; Haneke,Jörgen; Staelens,Jeroen; Oyarzún,Carlos; Paulino,Leandro; Barrientos,Mónica.
The growth of intensive livestock farming in the central depression of southern Chile (40° S) during the last century has resulted in elevated emissions of inorganic nitrogen (N) compounds into the atmosphere, particularly of NH3. Consequently, atmospheric N has been deposited to lakes, vegetation, and soil. Much attention has been paid to wet N deposition in southern Chile, while almost nothing is known about dry N deposition in this region. Our aim is to use an exploratory approach with SAM (Standard Air Monitoring) filters to investigate the potential contribution of the dry N deposition to the total N deposition in the central depression of southern Chile. Furthermore, the relationship between micro-climatological patterns and dry deposition was...
Tipo: Journal article
Palavras-chave: Atmospheric deposition; Nitrogen; Nothofagus obliqua forest; Pinus radiata plantation; Surrogate surface.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200006

Dry matter production, chemical composition, dry matter digestibility and occurrence of fungi in Bermuda grass hay (Cynodon dactylon) under different fertilization systems or associated with pea plantings in winter
Provedor de dados: 118
Autores: Ames,João Paulo; Neres,Marcela Abbado; Castagnara,Deise Dalazen; Mufatto,Liziane Maciel; Ducati,Camila; Jobim,Cloves Cabrera; Tres,Tamara Taís.
J.P. Ames, M.A. Neres, D.D. Castagnara, L.M. Mufatto, C. Ducati, C.C. Jobim, and T.T. Tres. 2014. Dry matter production, chemical composition, dry matter digestibility and occurrence of fungi in Bermuda grass hay (Cynodon dactylon) under different fertilization systems or associated with pea plantings in winter. Cien. Inv. Agr. 41(2): 163-174. This study aimed to evaluate the structural characteristics, dehydration curve, DM production, chemical composition, in vitro dry matter digestibility and occurrence of fungi in Bermuda grass hay (Cynodon dactylon cv. 'Bermuda grass', Tifton 85) produced in winter under different forms of fertilization or in association with a winter annual legume. The experimental design used was a randomized block with split plots...
Tipo: Journal article
Palavras-chave: Association with legume; Fungal contamination; Grass; Swine manure.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000200003

Dufourmentel Rhomboid Flap for Sacrococcygeal Pilonidal Sinus: Technical Details
Provedor de dados: 77
Autores: Manterola,Carlos; Otzen,Tamara.
Sacrococcygeal pilonidal disease (SPD) is a chronic an uncommon entity with a variety of alternatives for treatment. One of those is the excision of the sinus tract followed by a reconstruction with the rhomboid flap described by Dufourmentel. The aim of this paper is to describe the main phases of the technique. A detailed explanation of the key steps for the implementation of Dufourmentel flap for the treatment of SPD is exposed. Excision of sacrococcygeal pilonidal sinus followed by Dufourmentel rhomboid flap is an alternative to consider in the treatment of pilonidal disease.
Tipo: Journal article
Palavras-chave: Pilonidal Sinus; Pilonidal Sinus/surgery; Pilonidal Sinus/therapy; Dufourmentel flap; Rhomboid flap.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400005

Dung decomposition and associated beetles in a fragmented temperate forest
Provedor de dados: 97
Autores: BUSTAMANTE-SÁNCHEZ,MARCELA A.; GREZ,AUDREY A.; SIMONETTI,JAVIER A.
Habitat fragmentation may result in changes in species number and population abundance among habitats that differ in area, structure, or edge characteristics. These changes, in turn, may result in alterations in ecosystem process such as decomposition of organic matter. Through an experimental approach, we compared the beetles assemblages associated with dung and decomposition of cow feces in a continuous portion of Maulino forest, forest fragments and in pine plantations that surround this forest and forest remnants. Abundance and richness of dung-associated beetles were lower in forest fragments compared to the continuous forest and pine plantations. However, dung decomposition was similar in these three habitats. Beetle abundance, species richness and...
Tipo: Journal article
Palavras-chave: Temperate forest; Fragmentation; Insects; Decomposition.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000100009

Duplicidad no Ectópica del Uréter: Implicancias Clínicas
Provedor de dados: 77
Autores: Garbelotti Junior,S. A; Rodrigues Pereira,V; Marques,S. R; Moraes de Carvalho,L. O; Olave,E.
La duplicación del sistema colector renal es la variación más frecuente del sistema urinário y se puede presentar como duplicación completa o incompleta, así como la inserción ectópica en todas las partes del sistema urinario a partir de la parte distal hacia la vejiga. Este artículo presenta uma duplicación completa no ectópica del ureter en el riñón izquierdo de un cadáver de un individuo brasileño, de sexo masculino. Ambos uréteres tenían origen en el hilio renal y continuaban hasta la vejiga urinaria separadamente, desembocando en ostios diferentes, en el área del trígono vesical, donde el ostio perteneciente al uréter que drenaba el polo superior presentó posición distal y lateral en relación al ostio del uréter que drenaba el polo inferior. Esta...
Tipo: Journal article
Palavras-chave: Anatomía; Sistema urinario; Duplicación Uréter.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200037

Duración del efecto revigorizante de podas severas de plantas adultas de avellano europeo (Corylus avellana L.) cv. Negretta sobre el cultivo in vitro
Provedor de dados: 113
Autores: Sánchez-Olate,Manuel; Ríos,Darcy; Rodríguez,Roberto; Materán,María Elena; Pereira,Guillermo.
Se analizó la duración del efecto revigorizante de podas severas de avellano europeo (Corylus avellana L.) cv. Negretta adulto. Se evaluó la estimulación y la tasa de proliferación in vitro, sobre explantos resultantes de la estimulación de varetas obtenidas desde plantas adultas sin poda (T1), brotes epicórmicos de plantas sin poda (T2), plantas podadas una sola vez (T3) y plantas podadas dos veces (T4). En una primera etapa, se evaluó la respuesta a la estimulación climática utilizando varetas de entre 25 y 35 cm de largo y diámetros basales de entre 0,5 y 1,5 cm, obtenidas de plantas T1, T2, T3 y T4. En una segunda etapa, se evaluó la tasa de proliferación in vitro de explantos originados por la estimulación climática. Los resultados se analizaron...
Tipo: Journal article
Palavras-chave: Avellano; Cultivo in vitro; Capacidad morfogénica; Tejido adulto.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000400002

Dustbathing and intra-sexual communication of social degus, Octodon degus (Rodentia:Octodontidae)
Provedor de dados: 97
Autores: EBENSPERGER,LUIS A.
I observed the behavior of captive male and female Octodon degus to assess if dustbathing behavior plays a role in social communication among unfamiliar, same-sex conspecifics. Degus of a first group (control responders) were individually exposed during 10-min tests to an arena containing loose, clean soil. I compared the latency to first dustbathing as well as the overall frequency of dustbathing events recorded to control responders with the corresponding figures recorded to a second group of degus (experimental responders) after they were individually introduced into the same arena but with soil previously used for dustbathing by a same-sex conspecific (depositor). I also compared the location of dustbathing events by experimental responders with that...
Tipo: Journal article
Palavras-chave: Sandbathing; Scent communication; Rodents.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000200011

Dynamic Causal Models and Autopoietic Systems
Provedor de dados: 48
Autores: DAVID,OLIVIER.
Dynamic Causal Modelling (DCM) and the theory of autopoietic systems are two important conceptual frameworks. In this review, we suggest that they can be combined to answer important questions about self-organising systems like the brain. DCM has been developed recently by the neuroimaging community to explain, using biophysical models, the non-invasive brain imaging data are caused by neural processes. It allows one to ask mechanistic questions about the implementation of cerebral processes. In DCM the parameters of biophysical models are estimated from measured data and the evidence for each model is evaluated. This enables one to test different functional hypotheses (i.e., models) for a given data set. Autopoiesis and related formal theories of...
Tipo: Journal article
Palavras-chave: Dynamic Causal Modelling; Brain functional organization; Plasticity; Autonomous systems; Autopoiesis.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000500010

Dynamic Cr(III) uptake by Macrocystis pyrifera and Undaria pinnatifida biomasses
Provedor de dados: 69
Autores: Plaza Cazón,Josefina; Viera,Marisa; Donati,Edgardo.
Background: The increased industrial activity has resulted in the discharge of large amount of pollutants including non-degradable metals into the environment. Chromium is produced in several industrial processes and it can be found in the environment in two stable oxidation states, Cr(VI) and Cr(III). Cr(VI) is more hazardous due to its carcinogenic and mutagenic effects on living organisms. Although much less toxic, Cr(III) can also exert genotoxic effects under prolonged or severe exposure. It can be separated from the solution by precipitation but biosorption using brown algae seems to be an effective and sustainable treatment technique owing to its cost-effectiveness and environmental friendly characteristics. Macrocystis pyrifera and Undaria...
Tipo: Journal article
Palavras-chave: Biosorption; Brown algae; Chromium; Heavy metals.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300006

Dynamical Complexity in Cognitive Neural Networks
Provedor de dados: 48
Autores: GOLES,ERIC; PALACIOS,ADRIÁN G.
In the last twenty years an important effort in brain sciences, especially in cognitive science, has been the development of mathematical tool that can deal with the complexity of extensive recordings corresponding to the neuronal activity obtained from hundreds of neurons. We discuss here along with some historical issues, advantages and limitations of Artificial Neural Networks (ANN) that can help to understand how simple brain circuits work and whether ANN can be helpful to understand brain neural complexity
Tipo: Journal article
Palavras-chave: Artificial; Neural Net; Brain; Dynamical Complexity; Computational Neurosciences; Cellular Automata.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000500009

DYNAMICS OF GENERATION OF EXTREME PRECIPITATION IN THE NORTHERN OF PERU
Provedor de dados: 72
Autores: Carrillo,Mauricio; Bazo,Juan.
This article studies the influential factors in the occurrence of extreme rainfall in the northern Peru. The favorable conditions are analyzed under the following hypothesis: warming up of the sea surface temperature (SST), the southward movement of the Inter Tropical Convergence Zone (ITCZ), and the advection of humidity transferred from the east part of the Andes. Extreme rainfall has been periodically observed, it occurs during El Niño and non El Niño events. The main goal is to quantify the critical threshold for this occurrence. These limits will be associated to the teleconnections of the SST, ITCZ and winds. The generation of a warm "nucleus" of SST facilitates the creation of convergence "nucleus" in low levels due to positive temperature...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200016

Dynamics of Stomach Growth in the Human Fetal Period: a Postmortem Study
Provedor de dados: 77
Autores: Gworys,Bohdan; Jeka,Slawomir; Brukiewa,Radoslaw; Rymko,Marcin.
The aim of this work was to analyze the stomach growth rate, variability of proportion and shape during prenatal period, as well as evaluation of final features differentiation process distinctive for perinatal period. It seems interesting to compare stomach growth analyzed in situ on post-mortem fetuses with results obtained by other authors evaluating this process in sonographic examinations. Research was conducted on 225 post-mortem fetuses 12th to 40 th week of fetal age. There were measurements of stomach total length, lengths of greater and lesser curvature and cardia and pylorus widths performed. We evaluated the thickness of stomach front wall and bottom and its total mass. Statistical analysis was performed using statistical program package...
Tipo: Journal article
Palavras-chave: Stomach; Fetal development.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200017

Dynamics of tear fluid desiccation on a glass surface: a contribution to tear quality assessment
Provedor de dados: 48
Autores: Traipe-Castro,Leonidas; Salinas-Toro,Daniela; López,Daniela; Zanolli,Mario; Srur,Miguel; Valenzuela,Felipe; Cáceres,Aníbal; Toledo-Araya,Héctor; López-Solís,Remigio.
BACKGROUND: Fern-like crystalloids form when a microvolume of tear is allowed to dry out at ambient conditions on a glass surface. Presence of crystalloids in tear "microdesiccates" is used to evaluate patients with Dry-Eye disease. This study aims to examine morphologically the desiccation process of normal tear fluid and to identify changes associated with accelerated tear evaporation. Tear microdesiccates from healthy (Non-Dry Eye) and Dry Eye subjects were produced at ambient conditions. Microdesiccate formation was monitored continuously by dark-field video microscopy. Additionally, accelerated desiccation of tear samples from healthy subjects was conducted under controlled experimental conditions. Particular morphological domains of tear...
Tipo: Journal article
Palavras-chave: Tear; Tear ferning test; Dry eye; Dark-field microscopy.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100025

Dysmyelination, demyelination and reactive astrogliosis in the optic nerve of the taiep rat
Provedor de dados: 48
Autores: KRSULOVIC,JUAN; COUVE,EDUARDO; RONCAGLIOLO,MANUEL.
Taiep is an autosomal recessive mutant rat that shows a highly hypomyelinated central nervous system (CNS). Oligodendrocytes accumulate microtubules (MTs) in association with endoplasmic reticulum (ER) membranes forming MT-ER complexes. The microtubular defect in oligodendrocytes, the abnormal formation of CNS myelin and the astrocytic reaction were characterized by immunocytochemical and ultrastructural methods during the first year of life. Optic nerves of both control and taiep rats were processed by the immunoperoxidase method using antibodies against tubulin, myelin basic protein (MBP) and glial fibrillary acidic protein (GFAP). Taiep oligodendrocytes are strongly immunoreactive against tubulin, indicative of a significant accumulation of...
Tipo: Journal article
Palavras-chave: Myelin mutant; Taiep rat; Optic nerve; Dysmyelination; Demyelination; Astrogliosis.
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97601999000400005

Early Administration of Peroxisomicine A1 (T-514 Extracted from K. parvifolia Seeds) Causes Necrosis of Implanted TC-1 Cells without Affecting Target Organs in a Murine Model
Provedor de dados: 77
Autores: Soto-Domínguez,Adolfo; Piñeyro-López,Alfredo; Saucedo-Cárdenas,Odila; Ramírez-Durónd,Rosalba; Waksman de Torres,Noemí; Sepúlveda-Saavedra,Julio.
Peroxisomicine A1 (PA1), one of the toxins isolated from seeds of plants of the Karwinskia genus, whose targets organs are the liver, kidney, and lungs. There is a selective toxicity in vitro to cancer-cell lines derived from the lungs, liver, and colon, compared to normal cell lines. PA1 caused apoptosis in several cancer-cell lines in culture. In toxic doses to rodents, it causes extensive apoptosis in the liver, kidney, and lungs. In our study we were interested in evaluating, for the first time, the morphological effects of administration of PA1 to implanted TC-1 cells and in the target organs in vivo. The TC-1 cells were cultured and injected into the hind limb of C57BL-6 mice. The animals were divided into 3 groups; those treated with four doses of 1...
Tipo: Journal article
Palavras-chave: Antineoplasic effect; Necrosis; Peroxisomicine A1; Selective toxicity; TC-1 cells.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100051

Early and late molecular and morphologic changes that occur during the in vitro transformation of Trypanosoma cruzi metacyclic trypomastigotes to amastigotes
Provedor de dados: 48
Autores: CONTRERAS,VÍCTOR T; NAVARRO,MARÍA C; DE LIMA,ANA R; DURAN,FRANCY; ARTEAGA,ROSA; FRANCO,YUNAIMY.
The amastigogenesis primary of T. cruzi occurs naturally when metacyclic trypomastigotes transform into amastigotes within the cells of the mammalian host. The in vitro study of the macromolecular changes that occur over several days during the transformation process should provide significant indications of how the parasite adapts to the mammalian host environment. We show here that metacyclic trypomastigotes pre-incubated at 37&amp;deg; C in a protein-rich medium reach a high degree of transformation to amastigotes when re-incubated in the fresh medium. Giemsa-stained smears show that during the pre-incubation phase, the metacyclic trypomastigotes undergo lengthening at the posterior end and a thinning out of the entire body. SDS-PAGE analysis of...
Tipo: Journal article
Palavras-chave: Amastigogenesis; Differentiation; Macromolecular changes; Metacyclic trypomastigotes; Trypanosoma cruzi.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000100008

Early and Late Outcomes of Surgery of Non-Complicated Liver Hydatid
Provedor de dados: 77
Autores: Manterola,Carlos; Otzen,Tamara.
Hepatic echinococcosis (HE) is a prevalent health problem, and there is limited published information regarding HE surgery. On the other hand, postoperative morbidity (POM) has not varied significantly. The aim of this study was to describe early and late outcomes in terms of POM of a series of patients with non-complicated liver hydatid cysts (NLHC) treated surgically. Prospective cohort. We included patients undergoing surgery for NLHC in the Hospital Regional and Clínica in Temuco, between 2000 and 2015. The main outcome variable was the development of early and late POM. Other variables of interest were hospital stay, mortality and recurrence. Surgical techniques used were total or subtotal pericystectomy and liver resection. Percentages, measures of...
Tipo: Journal article
Palavras-chave: Echinococcosis; Hepatic Hepatic Hydatid Cyst Echinococcosis; Hepatic/surgery Treatment Outcome Postoperative Complications.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200029

Early individual growth of Eucryphia cordifolia and Laurelia sempervirens planted under different competition conditions in south-central Chile
Provedor de dados: 118
Autores: Uteau,Daniel; Donoso,Pablo J.
Few studies have focused on forest research in plantations with Chilean native species midtolerant to shade. Such species may use resources that intolerant species cannot, increasing the total site productivity. This study aimed to define the factors that explain the growth of Euctyphia cordifolia Cav. and Laurelia sempervirens (Ruiz et Pavón) Tul., two midtolerant species of southern Chile. We sought to determine the effect on these species of competition in mixed-species plantations. At the time of this study, the plantations were 4 to 22 years old . Two competition indices were analyzed for each species: the Growing Space Polygon (GSP) and the Canopy Overlap (CO). The GSP proved to be very useful in predicting the growth in the older plantations where...
Tipo: Journal article
Palavras-chave: Competitionindex; Forest; Growth; Growing space polygon; Crown competition; Midtolerant species; Silviculture.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000100008

Early knowledge of Antarctica's vegetation: Expanding past and current evidence
Provedor de dados: 97
Autores: HEBEL,INGRID; GALLEGUILLOS,CAROLINA; JAÑA,RICARDO; DACASA-RÜDINGER,MARIA D.C.
To commemorate one hundred years of Roald Amundsen's reaching the South Pole, we provide a summary of early explorations to Antarctica, in which botanists played an almost anonymous role. Based on multiple observations of vegetation they found and recorded, we review the knowledge available at the end of the nineteenth century to compare with contemporary scientific beliefs; connecting them with observations we have collected in field-work. Using the aerial photography from the end of the 1950s of sites we visited, it is noted that opportunities are arising for the understanding of colonization phenomena in areas where ice is retreating. Accounts of research on colonization of new ice-free areas are analyzed as well as how molecular genetics attempts to...
Tipo: Journal article
Palavras-chave: Amundsen; Ice-free areas; Moss; Niche conservation; Sanionia uncinata.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400004

Early Osseous Tissue Formation Associated to Submerged and Non-Submerged Dental Implants: A Histomorphometric Animal Study
Provedor de dados: 77
Autores: Olate,Sergio; Chaves Netto,Henrique Duque de Miranda; Mazzonetto,Renato; Albergaria-Barbosa,Jose Ricardo de.
The purpose of this research was to compare the bone formation around submerged and non-submerged implants installed in a mandible of dog. Seven beagle dogs were used in this protocol; initially, was performed extraction of posterior teeth of mandible and after 3 month healing were installed two dental implants with surface treatment (subtraction of titanium via acidification) in each hemimandible. A transmucosal healing screw of 7 mm without oclusal contact was installed at the anterior implant as a model of non-submerged implant; in the posterior implant were installed a cover screw, using the submerged technique. After six weeks of healing, histomorphometric analysis of osseous tissue between the threads was performed. Was analyzed the implant unit as...
Tipo: Journal article
Palavras-chave: Dental implant; Non-submerged implant; Bone repair.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100023

Early Proliferation of Bone Marrow Mononuclear Cells on Collagen Membrane, Bone Graft and Tooth Cementum
Provedor de dados: 77
Autores: Milagres,Débora; Rueff-Barroso,Carlos R; Carvalho,Simone N; Carvalho,Laís de; Monte-Alto-Costa,Andréa; Fischer,Ricardo G; Porto,Luís Cristóvão.
The ultimate goal of periodontal therapy is to repair the damaged periodontal supporting tissues, permitting regeneration of the periodontal ligament. However, the cell response, the supportive matrix and the bioactive molecules use have not yet been well established. Bone marrow mononuclear cells were extracted from rat femurs and tibiae and cultured on a cross-linked collagen membrane, bone graft, or molar tooth to compare cell attachment and early proliferation on these materials. Cell attachment was quantified by light microscopy at 24, 48 and 72h, and cell proliferation was observed under a SEM after 72h. After 24h, the number of cells on bone graft was similar to that of the control and more than twice compared to collagen membrane (q=7.473...
Tipo: Journal article
Palavras-chave: Stem cells; Collagen membrane; Bone graft; Cementum; Proliferation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400045

Easy and Unbiased Determination of the Maxillary Sinus Volume
Provedor de dados: 77
Autores: Coronado,Cesar; Arriagada,Oscar; Suazo Galdames,Iván.
Determining the volume of the maxillary sinus is necessary in certain procedures. We present a simple method for estimating the volume of the maxillary sinus from groups 3, 5 and 9 coronal CT scan using the Cavalieri method combined with systematic sampling and evaluated randomized images. We used 10 dry skulls submitted to the TC. The actual volume was determined using silicone adapted to the maxillary sinus cavity. The estimated volume showed a high correlation with real volume, with no differences between groups. We concluded that it is possible to estimate without bias and with high accuracy the volume of the maxillary sinus from a minimum of 3 CT images obtained through randomized systematic sampling and the proposed method.
Tipo: Journal article
Palavras-chave: Cavalieri's principle; Volume; Computed tomography; Maxillary sinus.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400051

Echinococcus granulosus protoscolex formation in natural infections
Provedor de dados: 48
Autores: GALINDO,MARIO; GONZALEZ,M JULIETA; GALANTI,NORBEL.
Echinococcus granulosus is a parasitic platyhelminth that is responsible for cystic hydatid disease. From the inner, germinal layer of hydatid cysts protoscoleces are generated, which are are the infective forms to the dog. Systematic studies on the cell biology of E. granulosus protoscolex formation in natural infections are scarce and incomplete. In the present report we describe seven steps in the development of protoscoleces. Cellular buds formed by a clustering of cells emerge from the germinal layer of hydatid cysts. The buds elongate and the cells at their bases seem to diminish in number. Very early on a furrow appears in the elongated buds, delimiting anterior (scolex) and caudal (body) regions. Hooks are the first fully-differentiated structures...
Tipo: Journal article
Palavras-chave: Protoscolex formation; Hydatid cyst.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000300011

Ecofisiología de tallos jóvenes (cladodios) de Opuntia ficus-indica en condiciones húmeda y seca
Provedor de dados: 73
Autores: PlMIENTA-BARRIOS,EULOGIO; ZAÑUDO HERNÁNDEZ,JULIA; MUÑOZ-URIAS,ALEJANDRO; ROBLES-MURGUÍA,CELIA.
Las tasas de asimilación neta de CO2 fueron medidas cada 2 h por 24 h en tallos jóvenes (cladodios) de Opuntia ficus-indica (L.) Miller que estaban regados o expuestos a sequía en la primavera. También fue registrado el contenido relativo de agua. Los cladodios jóvenes mostraron metabolismo ácido de las crasuláceas (MAC). La sequía en la primavera redujo la asimilación neta diaria de CO2 y el riego la mantuvo. El ambiente seco afectó a la expresión de las fases de MAC reduciendo la asimilación de CO2 al final de la tarde (fase IV de MAC) más que por la mañana temprano (fase II) o por la noche (fase I). Los cladodios jóvenes mantuvieron valores positivos de ganancia de carbono en la primavera: no obstante su escasa cantidad de parénquima de almacenamiento...
Tipo: Journal article
Palavras-chave: Asimilación neta diaria de CO2; Contenido relativo de agua; Opuntia; Metabolismo ácido de las crasuláceas; Sequía.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200002

Ecología de comunidades (2007)
Provedor de dados: 97
Autores: GALETTO,LEONARDO.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300012

Ecología de comunidades Jaksic F
Provedor de dados: 97
Autores: GUTIÉRREZ,JULIO R.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400017

Ecología del crecimiento de una lagartija del género Xenosaurus Peters 1861 (Squamata: Xenosauridae) en la Reserva de la Biosfera, Sierra Gorda, Querétaro, México
Provedor de dados: 97
Autores: ZAMORA-ABREGO,J. GASTÓN; ZÚÑIGA-VEGA,J. JAIME; ORTEGA-LEÓN,ANGELA M.
Analizamos el crecimiento corporal de una nueva especie de lagartija endémica del género Xenosaurus Peters, ubicada en la Reserva de la Biósfera, Sierra Gorda - Querétaro, México. Se estimaron las tasas de crecimiento corporal y se analizaron a partir de los modelos de crecimiento de Von Bertalanffy, logístico por longitud y logístico por peso. Para describir el patrón de crecimiento de estas lagartijas, utilizamos el modelo logístico por longitud debido a que fue el modelo que tuvo el mejor ajuste a las tasas observadas de crecimiento corporal. No encontramos diferencias significativas entre machos y hembras en el parámetro característico de crecimiento ni en la talla asintótica proyectada. Por lo tanto, se construyó una sola curva de crecimiento para...
Tipo: Journal article
Palavras-chave: Historias de vida; Lagartijas vivíparas; Madurez sexual; Tamaño corporal.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000300006

Ecología energética y nutricional en aves herbívoras pequeñas
Provedor de dados: 97
Autores: LOPEZ-CALLEJA,M. VICTORIA; BOZINOVIC,FRANCISCO.
La herbivoría en aves es una estrategia poco común. Solo el 3% de las aves actuales consumen plantas como fuente de energía. Tanto la composición química de las plantas como las restricciones asociadas al vuelo y digestión en aves pueden explicar el reducido número de pequeños endotermos, como las aves, que son herbívoros. Nuestro objetivo es explicar como las aves herbívoras satisfacen sus requerimientos nutricionales y energéticos cuando consumen dietas extremadamente pobres. Para lo cual nos centramos en Phytotoma rara (Phytotomidae), posiblemente el ave herbívora más pequeña. Phytotoma rara presenta numerosas características, como el rápido tiempo de transito, un efectivo rompimiento de la pared celular, y la alta y constante actividad de las enzimas...
Tipo: Journal article
Palavras-chave: Herbivoría; Aves; Tamaño corporal; Forrajeo; Digestión; Energética.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300005

Ecología reproductiva de Pistacia lentiscus L. (Anacardiaceae): un anacronismo evolutivo en el matorral mediterráneo
Provedor de dados: 97
Autores: VERDÚ,MIGUEL; GARCÍA-FAYOS,PATRICIO.
El lentisco (Pistacia lentiscus L., Anacardiaceae) es un arbusto esclerófilo de origen Oligocénico muy común en el Mediterráneo. Las condiciones climáticas imperantes en el momento en que se habría originado P. lentiscus eran de tipo tropical cálido, muy distintas a las mediterráneas actuales, por lo que muchos de los caracteres que presenta actualmente la especie pueden ser más un reflejo a las condiciones bajo las que evolucionó que a las condiciones actuales. Es en este sentido en el que se considera a esta especie como un anacronismo evolutivo. Para contestar a la pregunta de si el ser anacrónico significa poseer una estrategia inadecuada en las condiciones mediterráneas actuales, se ha realizado una revisión sobre la biología reproductiva de P....
Tipo: Journal article
Palavras-chave: Historia de vida; Mediterráneo; Pistacia lentiscus; Tropical.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100006

Ecología trófica de Athene cunicularia (Aves: Strigidae) en un sistema insular del norte de Chile: ¿posible respuesta funcional y numérica frente a Pelecanoides garnotii (Aves: Pelecanoididae)?
Provedor de dados: 72
Autores: CRUZ-JOFRÉ,FRANCO; VILINA,YERKO A.
Se analizó la dieta del pequén (Athene cunicularia) en cuatro islas del norte de Chile, mostrando que existe un fuerte predominio de artrópodos (89,1%) en comparación con los vertebrados (10,1%) respecto al número de presas consumidas. De estos taxa destacan los tenebriónidos (42,2%) y curculiónidos (31,2%) como los principales grupos consumidos, sin embargo, la presencia de mamíferos (3,6%) y de aves (6%) en la dieta es también relevante, ya que a pesar de representar menos del 10% del número total de presas, el aporte energético de estos vertebrados constituyó cerca del 80% de la biomasa total ingerida. Se registró evidencias de depredación sobre el yunco (Pelecanoides garnotii); presa destacada con un 71% dentro del ítem aves y 40% del total de...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000100005

Ecología trófica de Girella laevifrons (Pisces: Kyphosidae) en zonas intermareales rocosas del norte de Chile afectadas y no afectadas por contaminantes derivados de la minería del cobre
Provedor de dados: 97
Autores: FARIÑA,JOSE MIGUEL; ALDANA,MARCELA; OGALDE,FERNANDO; OJEDA,F. PATRICIO.
La zonas intermareales de localidades de la costa norte de Chile afectadas por contaminantes derivados de la minería del cobre, presentan una diversidad de especies sésiles menor que las localidades no afectadas. Girella laevifrons es un pez altamente representado en zonas intermareales rocosas del norte de Chile. En el presente trabajo se analiza y compara la ecología trófica de esta especie, en relación con las diferencias en la composición de especies sésiles de sitios contaminados y no contaminados. Los resultados muestran diferencias significativas en la composición trófica de los ejemplares presentes en los sitios afectados y no afectados. Dentro de los sitios afectados, se observan diferencias en los tamaños y en las concentraciones de cobre...
Tipo: Journal article
Palavras-chave: Peces intermareales; Girella laevifrons; Efluentes de cobre; Herbivoría.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100013

Ecología trófica de los ostreros Haematopus palliatus pitanay (Murphy 1925) y Haematopus ater (Vieillot et Oudart 1825) en mantos del tunicado Pyura praeputialis (Heller 1878) en la Bahía de Antofagasta, Chile
Provedor de dados: 97
Autores: PACHECO,CRISTIAN J.; CASTILLA,JUAN C.
En Antofagasta, norte de Chile, coexisten dos especies de ostreros: Haematopus palliatus pitanay (ostrero blanco) y Haematopus ater (ostrero negro). Ambas especies depredan en un sistema rocoso intermareal peculiar cuya franja media se encuentra dominada por el tunicado Pyura praeputialis (= Pyura stolonifera bradleyi; &lt;A HREF="#kott97"&gt;Kott 1997&lt;/A&gt;). En la literatura se discute sobre las diferencias morfológicas del pico (largo y ancho) entre ambos tipos de ostreros. Dichas diferencias podrían segregar los roles de forrajeo de estas aves cuando comparten un mismo hábitat: los ostreros blancos atacarían preferentemente a presas de textura "blanda" y los ostreros negros atacarían presas de textura "dura" (i.e. cobertura calcárea). En este...
Tipo: Journal article
Palavras-chave: Ostreros; Tunicados; Haematopus; Pyura; Ecología trófica; Intermareal rocoso; Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300017

Ecología trófica del jabalí europeo (Sus scrofa) silvestre en Chile
Provedor de dados: 97
Autores: SKEWES,ÓSCAR; RODRÍGUEZ,ROBERTO; JAKSIC,FABIÁN M.
Documentamos la dieta del jabalí silvestre en el centro-sur de Chile basados en el examen de 20 estómagos colectados en los faldeos de volcán Mocho-Choshuenco (39°54' S, 72°02' O) y en el Parque Nacional Vicente Pérez Rosales (41°03' S, 71°54' O). La dieta está representada por animales, vegetales y hongos. Entre los vegetales y hongos son consumidas tanto las partes epígeas como hipógeas, lo mismo que frutos y semillas. Hongos y rizomas de Gunnera tinctoria constituyen ítemes vegetales cuantitativamente importantes en la alimentación. El jabalí forrajea en general en ambiente boscoso, pero las especies vegetales más frecuentes en la dieta se encuentran en espacios abiertos o fuera del bosque. El ambiente dominado por Chusquea spp. constituye un importante...
Tipo: Journal article
Palavras-chave: Especie invasora; Sudamérica; Bosque templado; Ratada; Semillación masiva.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000300004

Ecología y biodiversidad de vertebrados de Chile: Análisis comentado de la Zoología de Claude Gay
Provedor de dados: 97
Autores: JAKSIC,FABIAN M; CASTRO,SERGIO A.
A partir de la revisión de la sección zoológica de la Historia Física y Política de Chile elaborada por Claude Gay, analizamos su contribución al conocimiento de los vertebrados chilenos. Esta sección incluyó la descripción de 483 especies distribuidas en 68 mamíferos, 259 aves, 31 reptiles, 16 anfibios y 109 peces; de ellas, 50 especies fueron descritas por primera vez para la ciencia, pero los análisis taxonómicos posteriores sinonimizaron cerca del 58 % de ellas, quedando como válidas solo 21 especies. Este valor implica que el 1.1 % de la fauna de vertebrados de Chile actualmente conocida (unas 1900 especies) fue descrita por primera vez en dicha obra monumental.
Tipo: Journal article
Palavras-chave: Historia de la ciencia; Naturalista.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000300001

ECOLOGIA Y DISTRIBUCION DE HYDROCOTYLE CRYPTOCARPA SPEG. EN SUDAMERICA
Provedor de dados: 73
Autores: Alvarez,Miguel; Ramírez,Carlos; Deil,Ulrich.
Hydrocotyle cryptocarpa ha sido descubierto recientemente en diferentes localidades de Chile. Se expone brevemente el actual conocimiento sobre su distribución geográfica, ciclo de vida y autoecología. H. cryptocarpa posee inflorescencias unifloras y frutos monospermos y geocarpos, dichas características la ubican en una posición aislada dentro del género Hydrocotyle. Esta especie es anual y crece en ambientes acuáticos temporales. Adaptaciones especiales a este tipo de habitat son una forma de vida tenagófita (germinación bajo el agua, floración y fructificación durante la ecofase terrestre) y representativa de un "amphibious fluctuation responder" (hojas largamente pecioladas durante la ecofase acuática, hojas de pecíolos breves en la ecofase terrestre)....
Tipo: Journal article
Palavras-chave: Hydrocotyle; Taxonomía; Distribución geográfica; Humedales; Lagunas temporales.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200003

ECOLOGICAL BIOGEOGRAPHY: A REVIEW WITH EMPHASIS ON CONSERVATION AND THE NEUTRAL MODEL BIOGEOGRAFIA ECOLOGICA: REVISION CON ENFASIS EN CONSERVACION Y EL "MODELO NEUTRAL"
Provedor de dados: 72
Autores: Monge-Nájera,Julián.
Ecological biogeography studies the factors that define the spatial distribution of species in the present time. This review summarises recent contributions on ecological biogeography. Most recent articles report environmental factors such as temperature, humidity and salinity as key elements in the ecological biogeography of many species (followed by other organisms and genetic characteristics). Molecular data indicate that some "unexplainable" ranges are artifacts caused by taxonomic misidentification (several species erroneously classified as a single species). Island biogeography theory is often adequate for conservation management, and the new neutral model of ecological biogeography does not fit all species on which it has been tested. Global warming...
Tipo: Journal article
Palavras-chave: Review; Ecological biogeography; Temperate versus tropical; Global warming.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100012

Ecological theory and values in the determination of conservation goals: examples from temperate regions of Germany, United States of America, and Chile
Provedor de dados: 97
Autores: Jax,Kurt; Rozzi,Ricardo.
The definition of conservation goals is a complex task, which involves both ecological sciences and social values. A brief history of conservation strategies in Germany (protection of cultural landscapes), United States (wilderness ideal), and southern Chile (preservation paradigm and the more recent interest in ecotourism) illustrates a broad range of conservation goals. To encompass such an array of conservation dimensions and goals, the ecosystem approach adopted by the Conference of the Parties of the Convention on Biological Diversity represents a good approach. However, to become effective, this kind of approach requires clarifying and agreeing upon basic concepts, such as ecosystem. To serve that purpose, we present a scheme that considers the...
Tipo: Journal article
Palavras-chave: Conservation; Comparative approach; Ecological theory; Chile; Ecotourism; Ecosystem management; Germany; Images of nature; Magellan region; Social values; Yellowstone; Yellowstone.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000200012

Ecology: an integrated science for the artificialization of nature
Provedor de dados: 118
Autores: Gastó,Juan; Subercaseaux,Diego; Vera,Leonardo.
The main challenges confronting contemporary agronomy are being addressed according to the emerging and complex problems of our era. Agronomy corresponds to the science and profession of solving the problems ofagriculture. The emergence of agronomy in sociocultural processes and their coevolution is described, as agronomy represents the determinant for the artificialization of nature, the management of natural resources and the transformation and management of land. The integration of nature, culture and human well-being inform the tendencies that are expressed in the cultural landscape. Ecology, ecosystem, territory and cultural landscape are the resultant aspects that provide the basis for the study and development of natural resource and ecosystem...
Tipo: Journal article
Palavras-chave: Agronomy cultural landscape ecology ecosystem evolution of agronomy natural resources sociocultural processes territory; Transdisciplinarity.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300001

Ecomicrobiology and microbial assimilative capacity of the oligotrophic Andean Lake Laja, Chile
Provedor de dados: 97
Autores: KARRASCH,BERNHARD; WOELFL,STEFAN; URRUTIA,ROBERTO; GONZÁLEZ,JENNY; VALDOVINOS,CLAUDIO; CID,HERNÁN; PARRA,OSCAR.
A strong socio-economic development pressure in South Chile will more and more cause an impact to the present lakes and rivers. Nevertheless, our knowledge concerning the ecological structure and the microbial self-purification capabilities of these lacustrine water bodies is scant but essential for a future sustainable development of land and water use. We studied Lake Laja, a lake already heavily impacted by water diversions for hydropower generation and irrigation. Typical for the Andean region Lake Laja is an oligotrophic water body, limited by nitrogen nutrients. Only very low chlorophyll a and particulate organic carbon (POC) concentrations and a small abundance and biomass of bacteria (mainly ultramicrobacteria) and heterotrophic flagellates were...
Tipo: Journal article
Palavras-chave: Bacterioplankton extracellular enzymes heterotrophic flagellates N-limitation; Phytoplankton.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000300010

Economical Production of Lactic Acid Using Sugar Cane Wastes and Juice (Saccharum officinarum L.)
Provedor de dados: 113
Autores: Serna Cock,Liliana ; Rodríguez de Stouvenel,Aida.
Para la producción fermentativa discontinua de ácido láctico, se evaluaron como sustratos los jugos de cogollos y hojas (JCG) de la caña de azúcar (Saccharum officinarum L.) y los jugos extraídos de esta caña, cosechada con quema (JCL) y sin quema (JCV). Las fermentaciones se realizaron anaeróbicamente, a 32°C, con ajuste de pH a 6,0 y usando Lactococcus lactis subsp. lactis aislado de cultivos de la misma variedad. Para los sustratos mencionados y sus mezclas se estudió el efecto de la concentración de azúcares totales y de nitrógeno sobre la producción de ácido láctico (AL), la conversión de sustrato (CS), el rendimiento (Yp/s) y la productividad volumétrica (r p). Se obtuvieron concentraciones de ácido láctico por encima de 70,19 g L-1, CS de 85,46%,...
Tipo: Journal article
Palavras-chave: Residuos; Caña verde; Ácido láctico; Cogollos; Caña limpia.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000100004

Ecophysiological responses to drought followed by re-watering of two native Chilean swamp forest plants: Myrceugenia exsucca (DC.) O. Berg and Luma chequen (Molina) A. Gray
Provedor de dados: 73
Autores: BASCUÑÁN-GODOY,LUISA; ALCAÍNO,CLAUDIA; CARVAJAL,DANNY EDUARDO; SANHUEZA,CAROLINA; MONTECINOS,SONIA; MALDONADO,ANTONIO.
Myrceugenia exsucca (DC.) O. Berg and Luma chequen (Molina) A. Gray are two predominant species of Myrtaceae from the swamp forest which are strongly threatened by destruction of their habitat. Conservation programs include the creation of new protected areas which often have different environmental conditions respect their natural habitat. The drought tolerance and the capability to restore their physiological performance after stress relief are characteristic of great importance for the successful conservation programs on these kinds of plants. Understanding how these plants respond to episodic drought and watering pulse was the principal aim of this work. In this sense, water relations, soluble sugars, pigments and photosystem II (PSII) performance were...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200004

Ecophysiological strategies in response to UV-B radiation stress in cultures of temperate microalgae isolated from the Pacific coast of South America
Provedor de dados: 97
Autores: MONTECINO,VIVIAN; MOLINA,XIMENA; MARTÏNEZ,GINGER; OLMEDO,M. ISABEL; RETAMAL,LEIRA; HANNACH,GABRIELA; ORELLANA,MÓNICA V.
Marine microalgae exposed to ultraviolet radiation (UV) have complex adaptive responses provided by a series of protection and repair mechanisms. Interspecific differences in UV sensibility could result in differential selection of the more tolerant species, having consequences for the structure of phytoplankton assemblages. The relative importance of protection and photorepair mechanisms of microalgal cells exposed to potential UV-B stress was studied in monocultures with different taxonomic, ecological and size characteristics obtained from the Chilean coast. Differences in photosynthesis and growth rates were predicted, since the ability to effectively acclimate to UV is not universal between microalgal species. The dinoflagellate Alexandrium catenella...
Tipo: Journal article
Palavras-chave: Photosynthesis; Absorbance; Photoreactivation; Growth; UV response.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200007

Ecophysiology of Antarctic macroalgae: effects of environmental light conditions on photosynthetic metabolism
Provedor de dados: 97
Autores: GÓMEZ,I.
Daylength is the major environmental factor affecting the seasonal photosynthetic performance of Antarctic macroalgae. For example, the "season anticipation" strategy of large brown algae such as Ascoseira mirabilis and Desmarestia menziesii are based on the ability of their photosynthetic apparatus to make use of the available irradiance at increasing daylengths in late winter-spring. The seasonal development and allocation of biomass along the lamina of A. mirabilis are related to a differential physiological activity in the plant. Thus, intra-thallus differentiation in O2-based photosynthesis and carbon fixation represents a morpho-functional adaptation that optimizes conversion of radiant energy to primary productivity. In Desmarestia menziesii,...
Tipo: Journal article
Palavras-chave: Polar macroalgae; Antarctic; Photosynthesis; Daylength.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200004

Ecotoxicological Effects of Three Heavy Metals on the Root Growth of Four Vascular Plants
Provedor de dados: 113
Autores: Iannacone O.,José; Alvariño F.,Lorena.
Environmental risk assessment (ERA) of terrestrial environments polluted by heavy metals in Peru requires standardized biological organisms, the use of which is simple, practical, sensitive and repeatable, such as seeds of higher plants used in eco-toxicological bioassays. The aim of this research was to evaluate the phytotoxic effects of Cr6+, Hg2+ and Pb2+ as potassium dichromate (K2Cr(2)0(7)), mercury chloride (Cl2Hg) and lead acetate ((CH3C00)2Pb), respectively, on growing roots of four species of higher terrestrial plants: onions (Allium cepa L., Liliaceae), red beets (Beta vulgaris L., Chenopodiaceae), rice (Oriza sativa L., Poaceae) and radishes (Raphanus sativus L., Brassicaceae) at 192 h (8 days) exposure. Bioassays of static sub-lethal toxicity...
Tipo: Journal article
Palavras-chave: Heavy metals; Peru; Seeds; Vascular plants; Seeds; Mining waste; Chromium; Mercury; Lead.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200009

Ecotoxicology and Testicular Damage (Environmental Chemical Pollution): A Review
Provedor de dados: 77
Autores: Bustos-Obregón,Eduardo; Hartley B,Ricardo.
This review briefly considers the testicular damage elicited by environmental chemical pollution. It includes a short comment on environmental toxicology as an introduction to environmental chemical pollution, highlighting the importance of this current field of study and its impact on male reproductive health. Furthermore an experimental animal model addressing the effect of organophosphorated agropesticides as a testicular toxicant is presented. Moreover two relevant chemical contaminants and their effect on the testis, such as the classical case of lead and the rarely reported case of Boron on spermatogenesis, are considered. Additionally, the subject of biosentinel species and their relevance for the monitoring of pollution in aquatic and/or...
Tipo: Journal article
Palavras-chave: Environmental chemical pollution-testicular damage.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400009

Ectopic Thyroid Tissue With a Rare Vascular Variation
Provedor de dados: 77
Autores: Ramesh Rao,T; Balakrishnan,R; Prakashchandra ,Shetty ; Suresh,R.
Awareness of the variations and anomalous existence of some structures serve as useful guide for both in studies of human anatomy and in clinical practice today. Identification of ectopic thyroid tissue and variations in origin, number and course of the branches of the superior thyroid artery are of significant practical importance for the general, vascular surgeons and radiologist. Angiographic images with such vascular patterns may lead to confusion in interpretation. The relations of these vessels with the other structures are important for accurate diagnostic and invasive techniques and to prevent further complications during surgical interventions. In our routine dissections with the purpose of preparation of the teaching and museum specimens, it was...
Tipo: Journal article
Palavras-chave: Ectopic thyroid tissue; Vascular variation; Midline cervical mass.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100017

Ecuación Predictora de Masa Grasa Corporal en Deportistas con Lesión Medular Crónica: Estudio Piloto
Provedor de dados: 77
Autores: Ordonez,F. J; Rosety,I; Fornieles,G; Rodriguez-Pareja,A; Rosety,M. A; Alvero-Cruz,J. R; Rosety-Rodriguez,M.
La determinación del porcentaje de masa grasa en pacientes con lesión medular crónica (LMC) resulta de interés por la alta morbimortalidad cardiovascular que presenta este grupo. En el caso de deportistas, además, permitiría optimizar su rendimiento deportivo. Por consiguiente, el presente estudio se planteó como primer objetivo comparar diferentes métodos de estudio del porcentaje de masa grasa de deportistas con LMC. Y como objetivo secundario, identificar alguna ecuación que permita predecir los niveles de masa grasa de manera más económica, sencilla, rápida y no invasiva. Se diseño un estudio observacional y transversal en el que participaron voluntariamente 8 deportistas varones con LMC a nivel o por debajo de T5 que compiten a nivel nacional. El...
Tipo: Journal article
Palavras-chave: Lesión medular crónica; Deportista; Hombre; Masa grasa.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100043

EDAD Y CRECIMIENTO DE ODONTESTHES BREVIANALIS (GÜNTHER 1880) EN LA LAGUNA CONCHALI (31°53'; 71°32'), CHILE
Provedor de dados: 72
Autores: Vargas,Carolina; Contreras,Manuel; Vila,Irma.
Odontesthes brevianalis, un Atherinidae nativo de Chile, se distribuye desde La Serena (29°54', 71°15') hasta Puerto Montt (41°28', 72°56'), habita lagunas costeras principalmente con características eurihalinas. En la laguna Conchalí (31°53'; 71°32'), Los Vilos, IV Región, se estudió la población de esta especie respecto a edad y crecimiento, entre 1998 y 2001. La población de la laguna Conchalí cuenta con especí-menes que alcanzan 23,3 cm de LT. Se presentan tres grupos de edad, cuyos valores mediante Lepidometría corresponden a I+ 8,39 cm ± 0,13; II+ 14,37 cm ± 0,33; III+ 16,87 cm ± 0,18, Valores que se relacionan con la distribución de tallas mensuales. La población presenta un crecimiento de tipo lineal, sin diferencias significativas entre hembras y...
Tipo: Journal article
Palavras-chave: Odontesthes brevianalis; Sistemas eurihalinos; Laguna Conchalí.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200014

EDAPHIC MESOFAUNA COMMUNITY STRUCTURE IN ORGANIC AND CONVENTIONAL MANAGEMENT OF CRANBERRY (Vaccinium sp.) PLANTATIONS: AN AGROECOLOGICAL APPROACH
Provedor de dados: 127
Autores: Peredo P,Santiago F; Parada Z,Esperanza; Vega C,Marcela; Barrera S,Claudia P.
The aim of the present study was to determine and compare taxa richness, abundance and diversity of the edaphic mesofauna community between plantations of cranberries (Vaccinium sp.) subjected to organic and conventional management in farms in central-south Chile (37°28'S), as also to evaluate changes produced in their diversity and abundance diversity and abundance, as result of the change from conventional to organic management. In July 2006 two farms were chosen, one with one year under organic management (OM1) and a second one under six years of certified organic management (OM6). Each farm was divided in four quadrants, each one with a surface of 2,500 m . In each quadrant was extracted one sample with six replicas of 188.5 cm³ each. Samples were...
Tipo: Journal article
Palavras-chave: Edaphic mesofauna; Organic farming; Conventional farming; Vaccinium sp; Mediterranean climate.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000300006

EDDY CHARACTERISTICS AND TRACER TRANSPORTS FROM TP/ERS ALTIMETRY, IN A REGION OFFSHORE CHILE
Provedor de dados: 72
Autores: Chaigneau,Alexis; Pizarro,Oscar.
Based on 9 years (1993-2001) of Sea Level Anomaly measurements from TP/ERS altimeters, we characterize the mesoscale structures of the eastern South Pacific (10-35°S, 70-100°W). Integral zonal, meridional, and temporal scales of the mesoscale activity are described geographically in the study region. The length scales increase toward the north in agreement with the increase of the Rossby radius, whereas timescales show higher values in the south of the domain. Typical values of (Lx, Ly) are around 50 km at 35°S and 80-90 km at 10°S with elongation in the zonal direction revealing the anisotropic nature of the mesoscale structures. Timescales are in the range 15-45 days. We also estimate a space-varying eddy transfer coefficient K which parameterize the...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200019

EDDY-INDUCED HEAT TRANSPORT IN THE SUBTROPICAL NORTH PACIFIC FROM ARGO, TMI AND ALTIMETRY MEASUREMENTS
Provedor de dados: 72
Autores: Qiu,Bo; Chen,Shuiming.
Basin-scale heat transport induced by mesoscale oceanic eddies is estimated by combining satellite-derived sea surface height and temperature data with Argo float temperature/salinity data. In the North Pacific subtropical gyre, warm (cold) temperature anomalies of mesoscale eddies are found to be consistently located to the west of high (low) SSH anomalies. The phase misalignment between the temperature and velocity anomalies, however, is largely confined to the seasonal thermocline, causing most of the eddy-induced heat transport to be carried in the surface 200 m layer. By establishing a statistical relationship between the surface and depth-integrated values of the eddy heat transport, the basin-scale eddy heat transport is derived from the concurrent...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300033

EDITORIAL
Provedor de dados: 69
Autores: Marshall,Sergio.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500011

EDITORIAL
Provedor de dados: 69
Autores: Illanes,Andrés.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300001

EDITORIAL
Provedor de dados: 77
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000100001

Editorial
Provedor de dados: 48
Autores: LUXORO,MARIO.
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000300001

EDITORIAL
Provedor de dados: 48
Autores: MONASTERIO OPAZO,OCTAVIO.
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000400001

Editorial
Provedor de dados: 48
Autores: Arce,J. Patricio; Santos,Manuel J.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400001

Editorial
Provedor de dados: 48
Autores: Inestrosa C.,Nibaldo.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000300001

EDITORIAL
Provedor de dados: 48
Autores: SANTOS,MANUEL J.
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000300001

EDITORIAL ELECTRONIC JOURNAL OF BIOTECHNOLOGY ....MOVING FROM SCIENCE TO DEVELOPMENT...
Provedor de dados: 69
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300001

EDITORIAL ELECTRONIC JOURNAL OF BIOTECHNOLOGY ....MOVING FROM SCIENCE TO DEVELOPMENT...: The need to strength collaborative teams in lung cancer research
Provedor de dados: 69
Autores: Adonis,Marta; Gil,Lionel.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200001

EDUARDO DEL SOLAR OSSES 1932 - 2001
Provedor de dados: 48
Autores: URETA,TITO.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000200003

Educación Científica y Evolutiva en Chile: Problemas Funcionales y Confictos entre Enseñar y Aprender
Provedor de dados: 72
Autores: Camus,Patricio A.
En Chile, la educación media (secundaria) y universitaria de pregrado, y la conexión entre ellas, son los puntos más sensibles de la educación científca en biología y evolución, que estuvo seriamente deprimida hacia fnes del siglo XX. No obstante, hoy enfrentamos un escenario de transición favorable donde convergen tres factores capaces de potenciar la alfabetización biológica en sentido amplio: un nuevo currículum secundario que incluye un fuerte componente biológico, con énfasis en evolución y ecología; una reactivación de la formación pedagógica a nivel universitario; y un desarrollo científco creciente en el área de biología evolutiva. Sin embargo, estos factores aún están conectados débilmente, y su mejor articulación podría contribuir a mejorar...
Tipo: Journal article
Palavras-chave: Alfabetismo científco; Biología; Currículum; Enseñanza media; Pedagogía.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000300003

EDUCACIÓN SUPERIOR: DESAFÍOS Y TAREAS
Provedor de dados: 48
Autores: BRUNNER,JOSÉ JOAQUÍN.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000100004

"EDUCATING THE NEXT GENERATION OF OCEANOGRAPHERS" IN REGIONAL SCHOOLS ON THE CULTURE AND INTERNATIONAL LANGUAGE OF SCIENCE
Provedor de dados: 72
Autores: Young,Helen; Stuardo,José R.; Jones,Ian S.F.
This paper addresses the question of why the intellectual leadership of Oceanography is currently vested in developed countries while it is argued that developing countries have greater needs for the outcomes of Oceanography. The norms of the research science culture are discussed. These norms are not embedded in the culture of some developing regions but are central to western industrial societies. English language, as a carrier of the culture of science, is identified as a key element in enabling graduates to be leaders in their region and players on the international stage. The prospect of regional schools of excellence to educate indigenous graduates in Oceanography is explored as a way of empowering developing country professionals and of halting the...
Tipo: Journal article
Palavras-chave: Oceanography; Graduate education; English as second language; Scientific culture; Leadership; Developing countries.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200008

Efectividad de Aislamientos de Hongos Entomopatógenos Sobre Larvas de Polilla del Tomate Tuta absoluta Meyrick (Lepidoptera: Gelechiidae)
Provedor de dados: 113
Autores: Rodríguez,Marta; Gerding,Marcos; France,Andrés.
La polilla del tomate, Tuta absoluta Meyrick, es una plaga importante en el cultivo del tomate (Lycopersicon esculentum L.) en Chile. Estudios de laboratorio fueron realizados para evaluar la virulencia y efectividad de Qu-M558 de Metarhizium anisopliae var. anisopliae y Qu-B912 de Beauveria bassiana. La primera evaluación fue realizada aplicando concentraciones de 0 a 10(8) conidia mL-1 directamente sobre larvas de tercer estadio mediante el sistema de pulverización torre Potter. Las comparaciones fueron realizadas calculando el área bajo la curva del progreso de la mortalidad a través del tiempo. No se observaron diferencias en las áreas entre aislamientos (P = 0,384). La CL50 y CL90 para Qu-B912 fue de 10(4,4) y 10(7,6) conidias mL-1, y para Qu-M558 de...
Tipo: Journal article
Palavras-chave: Control biológico; Polilla del tomate; Tomate; Patología de insectos.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000200006

EFECTIVIDAD DE DIFERENTES DESINFECTANTES DE SEMILLA SOBRE LA PUDRICIÓN RADICAL (Gaeumannomyces graminis var. tritici) DEL TRIGO, EN EL SUR DE CHILE
Provedor de dados: 113
Autores: Andrade V.,Orlando.
Quince ensayos de campo fueron realizados entre los años 1997 y 2001, en la IX Región de Chile, con el propósito de evaluar la efectividad de diferentes desinfectantes de semilla en la disminución del daño causado por la pudrición radical (Gaeumannomyces graminis var. tritici) del trigo (Triticum aestivum L.), bajo condiciones de inoculación artificial. Parte de los ensayos se realizaron en suelo previamente esterilizado, y otros en suelo natural. Los resultados obtenidos permitieron determinar que los ingredientes activos triticonazole, en 12 de 15 ensayos y en dosis de 120 g i.a. 100 kg-1 de semilla, triadimenol en 8 de 13 ensayos y dosis de 30 g i.a. 100 kg-1 de semilla, y silthiofam en una única evaluación y en dosis de 25-31,25 g i.a. 100 kg-1 de...
Tipo: Journal article
Palavras-chave: Mal del pie; Pudrición radical; Gaeumannomyces graminis var. tritici; Trigo; Triticum aestivum L.; Fungicidas.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000200001

Efectividad de Extractos Botánicos de Diez Plantas Sobre la Mortalidad y Repelencia de Larvas de Rhynchophorus palmarum L., Insecto Plaga del Pijuayo Bactris gasipaes Kunth en la Amazonía del Perú
Provedor de dados: 113
Autores: Perez D,Diana; Iannacone O,José.
La resistencia de las plagas a los insecticidas químicos se ha incrementado en los últimos años, motivo por el que se buscan métodos alternativos, como extractos de plantas con actividad larvicida. El objetivo del presente trabajo fue evaluar el efecto sobre la mortalidad y repelencia de larvas de Rhynchophorus palmarum L. (Curculionidae), plaga del pijuayo Bactris gasipaes Kunth, de diez plantas con potencial biocida: ucullucuysacha (Heliotropium indicum L., Boraginaceae), floripondio (Brugmansia sp., Solanaceae), oreja de tigre (Tradescantia zebrina Hort. ex Bosse, Commelinaceae), piñon blanco (Jathropa curcas L., Euphorbiaceae), sacha yoco (Paullinia clavigera Schltdl., Sapindaceae), yuquilla (Euphorbia cotinifolia L., Euphorbiaceae), achiote (Bixa...
Tipo: Journal article
Palavras-chave: Insecticidas botánicos; Mortalidad; Perú; Repelencia; Etnobotánica.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000100003

Efectividad de siete consorcios nativos de hongos micorrízicos arbusculares en plantas de café en condiciones de invernadero y campo
Provedor de dados: 97
Autores: TREJO,DORA; FERRERA-CERRATO,RONALD; GARCÍA,ROBERTO; VARELA,LUCÍA; LARA,LILIANA; ALARCÓN,ALEJANDRO.
Se probó el efecto de siete consorcios de hongos micorrízicos arbusculares (HMA) aislados de fincas cafetaleras con diferente nivel de tecnología (bajo, medio y alto) del estado de Veracruz, en el crecimiento de plantas de café (Coffea arábica L.) var. Garnica en condiciones de invernadero y de campo. El grado de tecnificación influyó en la composición de especies de HMA, a mayor tecnificación menor número de especies de HMA encontradas. En condiciones de invernadero, los consorcios incrementaron la altura en un 91 % con respecto al testigo absoluto y al testigo fertilizado con fósforo (800 mg Ca(PO4)3 L-1). A los 130 días después de la inoculación (DDI), el mejor consorcio fue La Estanzuela (ES). En condiciones de campo, a los 290 DDI, las plantas...
Tipo: Journal article
Palavras-chave: Café; Crecimiento; HMA nativos; Supervivencia.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100002

EFECTIVIDAD SIMBIOTICA DE CEPAS NATURALIZADAS DE Mesorhizobium loti Y Bradyrhizobium sp. (Lotus) EN PLANTAS DE TRES ESPECIES DEL GENERO Lotus
Provedor de dados: 113
Autores: Barrientos,Leticia; Higuera,Marcelo; Acuña,Hernán; Guerrero,Jaime; Ortega,Fernando; Seguel,Ivette.
La lotera destaca en nuestro medio con un interesante potencial agrícola, por su capacidad fijadora de nitrógeno atmosférico y valioso aporte a los sistemas agropecuarios de bajos insumos. En este estudio se trabajó con las especies más utilizadas en el país, Lotus corniculatus L. o lotera de hoja ancha, Lotus glaber o lotera de hoja angosta, y Lotus uliginosus o alfalfa chilota. Con el objetivo de determinar la capacidad de fijar nitrógeno y evaluar en forma comparativa la eficiencia de la fijación simbiótica de distintas cepas, se realizó un ensayo bajo condiciones controladas con 68 cepas naturalizadas de Mesorhizobium loti y Bradyrhizobium sp. (Lotus). Para ello se utilizaron tubos con solución nutritiva (agarizada) de Norris y Date, sin nitrógeno. Las...
Tipo: Journal article
Palavras-chave: Eficiencia de fijación de nitrógeno; Cepas de rizobios.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000200005

Efecto Antimetastásico de Celecoxib/PLGA en un Modelo Murino de Adenocarcinoma Mamario TA3-MTX-R
Provedor de dados: 77
Autores: Roa,Ignacio; Moraga,José; Cantín,Mario; Rosas,Carlos; Lemus,David.
La metástasis es el proceso de propagación de un foco cancerígeno a un órgano distinto de aquel en que se inició; ocurriendo generalmente por vía sanguínea o linfática. La localización más frecuentes de las metástasis son los órganos más irrigados como el cerebro, pulmones, hígado, huesos y glándulas suprarrenales. El objetivo fue analizar el patrón de metástasis hepática de tumor TA3-MTX-R, luego de la aplicación del antiangiogénico Celecoxib microencapsulado en PLGA en ratones, así como la disminución de áreas metastásicas a nivel lobulillar. Se utilizó un modelo de tumor experimental, inducido por células TA3-MTX-R, en 18 ratones, separados en 3 grupos de 6 animales, los cuales fueron tratados con dos presentaciones de Celecoxib en administración...
Tipo: Journal article
Palavras-chave: Metástasis; Hígado; TA3-MTX; Celecoxib; PLGA.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200024

Efecto Cicatrizante de la Miel de Ulmo (Eucryphia cordifolia) Suplementada con Ácido Ascórbico como Tratamiento en Quemaduras
Provedor de dados: 77
Autores: Schencke,Carolina; Vasconcellos,Adriana; Salvo,Jessica; Veuthey,Carlos; del Sol,Mariano.
Debido al daño de la piel producto de quemaduras, los microorganismos encuentran condiciones favorables para su desarrollo, produciéndose desnaturalización, necrosis, exudado, congestión y edema. La miel posee actividad antioxidante, antiinflamatoria y antibacteriana. A su vez, el ácido ascórbico mejora la barrera epidérmica y reduce la contracción de heridas, entre otros. El objetivo de esta investigación fue evaluar morfológicamente la cicatrización de heridas con un tratamiento en base a miel de ulmo (Eucryphia cordifolia) suplementada con ácido ascórbico, comparando su efecto con miel de ulmo no suplementada, en heridas causadas por quemaduras de tipo B. La investigación fue aprobada por el Comité Ético Científico de la Universidad de La Frontera. Se...
Tipo: Journal article
Palavras-chave: Cicatrización; Miel ulmo; Ácido ascórbico; Quemaduras.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100022

Efecto de Aceites Esenciales de Lavanda y Laurel sobre el Ácaro Varroa destructor Anderson &amp;amp; Truemann (Acari:Varroidae)
Provedor de dados: 113
Autores: Neira C.,Miguel; Heinsohn P.,Paula; Carrillo Ll.,Roberto; Báez M.,Andrea; Fuentealba A.,Juan.
La varroasis es considerada la más seria enfermedad parasitaria de las abejas (Apis mellifera L.) y es provocada por el ácaro Varroa destructor Anderson &amp;amp; Truemann. Una gran cantidad de productos han sido probados para el control de esta enfermedad parasitaria. Actualmente se han generado razas resistentes, problemas de contaminación de la miel y de otros productos de la colmena, debido al uso indiscriminado y reiterado de algunos productos contra este ácaro. La tendencia actual es el uso de productos naturales como parte de una estrategia de control integrado. Esta investigación tuvo como objetivo evaluar los efectos de los aceites esenciales extraídos de Lavandula officinalis Chaix y Laurelia sempervirens (Ruiz et Pav.) Tul. sobre el ácaro Varroa...
Tipo: Journal article
Palavras-chave: Varroa; Varroasis; Aceites esenciales; Lavandula officinalis; Laurelia sempervirens.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000300003

EFECTO DE AVENILLA (Avena fatua L.) Y BALLICA (Lolium multiflorum Lam.) EN EL RENDIMIENTO DE TRIGO EN DOS ÁREAS AGROECOLÓGICAS
Provedor de dados: 113
Autores: Pedreros L.,Alberto.
Se efectuaron dos ensayos de campo, mediante un diseño aditivo, para evaluar el efecto de densidades crecientes de avenilla (Avena fatua L.) y ballica (Lolium multiflorum Lam.), separadamente, en la producción de trigo (Triticum aestivum L.) primaveral e invernal en el valle regado y la precordillera de Ñuble, respectivamente. Las densidades de avenilla fluctuaron entre 0 y 16 plantas m-2 en la precordillera andina y entre 0 y 24 plantas m-2 en el valle regado. En ballica, se utilizaron densidades de 0 a 50 plantas m-2 en la precordillera andina y de 0 a 80 plantas m-2 en el valle regado. Los datos obtenidos se ajustaron a un modelo hiperbólico para predecir el rendimiento y pérdida en rendimiento. Aumentos de una planta de avenilla m-2 significaron,...
Tipo: Journal article
Palavras-chave: Interferencia; Umbral económico; Producción de semillas; Malezas; AVEFA; LOLMU.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000300005

Efecto de Capas Endurecidas de Suelos Sobre el Potencial Productivo de Viñedos, Alto Valle de Río Negro, Patagonia, Argentina
Provedor de dados: 113
Autores: Apcarian,Alicia; Echenique,María del C; Aruani,María C; Reeb,Pablo.
En Aridisoles del Alto Valle de Río Negro, Argentina, se estudió el efecto de horizontes endurecidos sobre el potencial productivo de Vitis vinifera L., cultivares Merlot, Malbec y Cabernet Sauvignon. El trabajo se realizó durante la temporada 2002-2003 en 15,5 ha de viñedos. Se establecieron 61 sitios de muestreo. En vid se determinaron: peso/baya, nº racimos/planta, peso/racimo, producción/planta, sólidos solubles, acidez titulable, pH del mosto y las relaciones hollejo/pulpa y ºBrix/peso baya. Se describieron los suelos midiéndose: tipo, espesor y profundidad de los horizontes, textura, resistencia a la penetración, profundidades de los moteados, a la grava y a la capa freática. Las variables edáficas fueron analizadas mediante componentes principales,...
Tipo: Journal article
Palavras-chave: Aridisoles; Vid; Merlot; Malbec; Cabernet Sauvignon; Resistencia a la penetración; Componentes principales.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000100008

Efecto de Celecoxib en una Variante Multirresistente del Tumor TA3: Una Descripción Histológica
Provedor de dados: 77
Autores: Rosas C,Carlos; Roa,Ignacio; Sinning O,Mariana; Fuenzalida B,Marcela; Lemus A,David.
En el estudio del cáncer, se utilizan diversas líneas celulares, cada una de ellas con características propias. Una de esas líneas tumorales es la variante multirresistente a drogas del tumor TA3. Si bien, existen diversos estudios con esta línea tumoral, no existe una descripción morfológica detallada de esta, ni tampoco que se observe el efecto del Celecoxib, un inhibidor de COX-2 sobre este tejido. Se usaron 18 ratones divididos en 3 grupos, los cuales recibieron: Inoculación de PBS; inoculación de células tumorales TA3; inoculación de células tumorales + tratamiento con Celecoxib (1000 ppm), respectivamente. Los ratones fueron sacrificados y procesados histológicamente para ser teñidos con H&amp;E, PAS y Arteta. El estudio reveló que tumor muestra una...
Tipo: Journal article
Palavras-chave: Tumor; Angiogénesis; Celecoxib.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200005

Efecto de Cinara cupressi (Hemiptera: Aphididae) sobre el ciprés de la cordillera (Austrocedrus chilensis) después de aplicar control químico
Provedor de dados: 118
Autores: Baldini,Aída; Oltremari,Juan; Holmgren,Astrid.
Cinara cupressi es un áfido introducido que puede producir la muerte de árboles forestales, debido a un compuesto tóxico que inyecta durante su alimentación. En Chile se encuentra ampliamente distribuido infestando diversas especies de Austrocedrus, Cupressus, Chamaecyparis, Juniperus, Thuja y al híbrido Cupressocyparis. Austrocedrus chilensis se ve afectado en toda su distribución. Dado que este insecto en África infestó árboles de los géneros Callitris y Widdringtonia, emparentados filogenéticamente con Fitzroya, Austrocedrus y Pilgerodendron, esta plaga podría también adaptarse a plantas nativas como alerce (Fitzroya cupressoides) y ciprés de las Guaitecas (Pilgerodendron uviferum). Ambas especies se encuentran amenazadas. El presente estudio intenta...
Tipo: Journal article
Palavras-chave: Cinara cupressi; Austrocedrus chilensis; Control químico; Plagas forestales.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300012

EFECTO DE CUATRO LÁMINAS DE AGUA SOBRE EL RENDIMIENTO Y CALIDAD DE TOMATE (Lycopersicon esculentum Mill. cv. FA-144) DE INVERNADERO PRODUCIDO EN OTOÑO
Provedor de dados: 113
Autores: Ortega-Farias,Samuel; Márquez,Javier; Valdés,Héctor; Paillán,Juan H.
Se realizó una investigación en la Estación Experimental Panguilemo de la Universidad de Talca (35°23’ lat. Sur, 71°40’ long. Oeste, 110 m.s.n.m) con el objeto de evaluar el efecto de cuatro láminas de agua sobre el rendimiento y calidad de un cultivo de tomates (Lycopersicon esculentum L.) cv. FA-144, regado por cintas, durante los meses de enero a julio de 1997. Los tratamientos correspondieron a una reposición de 70, 100 y 150% de la evapotranspiración real (ETreal), T1, T2 y T3, respectivamente, y un testigo que correspondió a las láminas de agua que el agricultor utiliza tradicionalmente en la zona. La ETreal del tomate se estimó usando la evaporación de una bandeja modificada (diámetro = 50 cm y altura = 25 cm), cuyos valores fueron corregidos por un...
Tipo: Journal article
Palavras-chave: Riego; Evapotranspiración de cultivo; Sólidos solubles; Presión de pulpa de fruta.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000400010

EFECTO DE CUATRO LÁMINAS DE AGUA SOBRE EL RENDIMIENTO Y CALIDAD DE TOMATES DE INVERNADERO PRODUCIDO EN PRIMAVERA-VERANO
Provedor de dados: 113
Autores: Ortega-Farias,Samuel; Leyton,Ben-Hur; Valdés,Hector; Paillán,Hernán.
Se realizó una investigación para evaluar el efecto de cuatro láminas de agua sobre el rendimiento y calidad de un cultivo de tomates (Lycopersicon esculentum Mill.) cv. Presto, producido en invernadero en la Estación Experimental Panguilemo de la Universidad de Talca (35º 23’ lat. Sur; 71º 40’ long. Oeste; 110 m.s.n.m), durante los meses de agosto de 2000 a enero de 2001. Los tratamientos de riego correspondieron a una reposición de 60 (T1), 100 (T2) y 140% (T3) de la evapotranspiración real (ETreal) y un testigo (T4) que correspondió a las láminas de agua que los agricultores utilizan tradicionalmente en la zona. Los resultados indicaron que el mayor rendimiento total (180 t ha-1) fue obtenido en el tratamiento T3, seguido por el testigo. Los mayores...
Tipo: Journal article
Palavras-chave: Riego; Lycopersicon esculentum; Sólidos solubles; Materia seca; Rendimiento.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000400008

Efecto de Cuatro Niveles de Sombreamiento Sobre la Calidad de VAra Floral y Cormo de Liatris (Liatris spicata)
Provedor de dados: 113
Autores: Schiappacasse C,Flavia; Carrasco S,Gilda; Carrasco C,Fabiola.
El cultivo de Liatris spicata (L.) Willd. para flor cortada fue introducido en Chile hace más de una década. Se suele plantar en forma escalonada al aire libre en primavera y verano. Su estructura de propagación corresponde a un cormo, el cual se reutiliza en la siguiente plantación. Otros cultivos al aire libre se sombrean para reducir la temperatura, pero en liatris se desconoce el efecto del sombreamiento en nuestras condiciones, tanto para la vara floral como para el cormo. El presente estudio evaluó la calidad de las varas florales de L. spicata, cultivadas en la VII Región (35°33’ lat. Sur, 71°13’ long. Oeste) bajo diferentes niveles de sombra, utilizando mallas de 35; 50; 65 y 80% de sombra y un testigo sin sombra. Además se midió el peso de los...
Tipo: Journal article
Palavras-chave: Liatris; Flor cortada; Bulbo; Cormo; Nivel de luz.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000100013

Efecto de Cuatro Niveles de Sombreamiento sobre la Calidad de Vara y Bulbo de Dos Cultivares de Lilium (Lilium spp.)
Provedor de dados: 113
Autores: Schiappacasse C,Flavia; Carrasco S,Gilda; Carrasco C,Fabiola.
Los híbridos de Lilium spp. son importantes productos de exportación de la floricultura chilena. En cultivos al aire libre se suele sombrear para reducir la temperatura, sin embargo se desconoce el grado de sombreamiento adecuado para lograr buena calidad de varas florales y de bulbos. El presente estudio evaluó la calidad de las varas florales de dos cultivares híbridos de Lilium spp., el cv. Dreamland de tipo asiático y el cv. Alhambra de tipo oriental, cultivados en la VII Región (35°17’ lat. Sur, 71°17’ long. Oeste) bajo diferentes niveles de sombreamiento, utilizando mallas de 35; 50; 65; y 80% de sombra y un testigo sin malla. Además se midió el perímetro y peso de los bulbos al cabo de una, cuatro y ocho semanas después de la cosecha de flores. En...
Tipo: Journal article
Palavras-chave: Flor de corte; Bulbo de flor; Bulbo; Sombreamiento.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000400003

EFECTO DE CULTIVOS HOSPEDEROS Y NO HOSPEDEROS SOBRE PROPÁGULOS MICORRÍCICOS ARBUSCULARES
Provedor de dados: 127
Autores: Castillo,Claudia; Astroza,Ivonne; Borie,Fernando; Rubio,Rosa.
Estudios recientes en campo han demostrado que las esporas fúngicas disminuyen cuando se utilizan como pre-cultivo no hospederos. El objetivo de este trabajo fue estudiar la influencia de un cultivo hospedero, avena (Avena sativa L.) y cultivos no hospederos, como lupino (Lupinus albus L.) y raps (Brassica napus L.) sobre los propágulos de hongos micorrícicos arbusculares (HMA) y diversidad fúngica junto con la actividad fosfatásica en un Andisol serie Temuco e Inceptisol serie Lumaco. El ensayo se realizó en condiciones de invernadero, desde septiembre de 2006 hasta marzo de 2007, utilizándose macetas de 5 kg con un diseño experimental completamente al azar con cuatro repeticiones. El número de esporas HMA fue mayor en el Andisol que en el Inceptisol y...
Tipo: Journal article
Palavras-chave: Avena; Lupino; Raps; Andisol; Inceptiso.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000100004

Efecto de Diferente Dosis de Lodo de la Crianza de Salmones en el Cultivo de Papa y su Efecto Residual en Ballica Anual
Provedor de dados: 113
Autores: Teuber K,Nolberto; Salazar S,Francisco; Alfaro V,Marta; Valdebenito B,Aldo.
La producción intensiva de salmones genera residuos orgánicos que tienen un uso potencial en suelos agrícolas, existiendo escasa información publicada de su utilización. El objetivo del presente estudio fue evaluar el efecto de tres dosis de lodo de salmón en el desarrollo del cultivo de papa (Solanum tuberosum) y su efecto residual en ballica anual (Lolium multiflorum). El ensayo se estableció en un suelo Andisol de la serie Osorno (Typic Hapludands), ubicado en Osorno (40º35’S, 73º08’O), Chile. Los tratamientos fueron tres dosis de lodo (50, 100 y 200 t ha-1), un control (sin fertilización orgánica e inorgánica) y un tratamiento de fertilización inorgánica. El lodo se incorporó al suelo, posteriormente se plantó papa cv. Yagana-INIA y después de la...
Tipo: Journal article
Palavras-chave: Lodo salmones; Suelo volcánico; Fertilización inorgánica; Papa.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400007

Efecto de diferentes dosis de fertilización inorgánica con N, P, K y fuente orgánica (estiércol de broiler) sobre la producción de maíz y la fertilidad del suelo
Provedor de dados: 113
Autores: Hirzel,Juan; Rodríguez,Nicasio; Zagal,Erick.
La disponibilidad de cama de broiler (CB), mezcla de estiércol de broiler sobre viruta, ha aumentado sostenidamente debido a la mayor producción de carne de ave. El uso de este producto como fertilizante disminuye la contaminación desde zonas de acumulación y a la vez mejora la fertilidad de los suelos. En este estudio se comparó el nivel de macronutrientes, pH, materia orgánica (MO) y conductividad eléctrica (CE) del suelo y la producción de MS de maíz (Zea mayz L.), para ensilaje obtenidos con la aplicación de dos fuentes de N:P2O5:K2O: CB y fertilizantes inorgánicos, (urea, superfosfato triple (SFT) y muriato de potasio (KCl)), en suelos de origen volcánico de la VII y VIII Región de Chile, correspondientes a un Vitrandepts y Typic Melanoxerands,...
Tipo: Journal article
Palavras-chave: Maíz; Fertilización; Cama de broiler; Zea mays L.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000400005

EFECTO DE DIFERENTES FERTILIZANTES POTÁSICOS EN EL CONTENIDO FOLIAR DE NUTRIENTES, PRODUCCIÓN Y CALIDAD DE FRUTA EN NARANJO cv. VALENCIA
Provedor de dados: 113
Autores: Opazo A.,José Domingo; Razeto M.,Bruno.
El naranjo (Citrus sinensis (L.) Osbeck) tiene altos requerimientos de potasio. Los estudios nutricionales en Chile han identificado huertos con contenidos foliares bajo el nivel crítico (7,0 g kg-1). Los objetivos del estudio fueron evaluar distintos fertilizantes potásicos: KCl, KNO3, K2SO4 y K-MgSO4 (sal doble de potasio y magnesio) y determinar los efectos en la calidad y rendimiento de fruta luego de tres años de aplicación. Se utilizaron árboles cv. Valencia, de 18 años, plantados en un suelo correspondiente a la Serie La Rosa, clasificado como Mollisol. El riego correspondía al convencional por surcos, tres surcos entre las hileras. La concentración promedio de K foliar inicial fue de 5,7 g kg-1, el cual es un nivel bajo. El nivel de K disponible en...
Tipo: Journal article
Palavras-chave: Potasio; Naranjo; Análisis foliar; Tamaño de fruto.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000400009

Efecto de Diferentes Niveles de Agua Aplicada en Post-Cuaja y en Post-Pinta Sobre la Calidad del Vino cv. Cabernet Sauvignon
Provedor de dados: 113
Autores: Acevedo O,César; Ortega-Farías,Samuel; Hidalgo A,Claudio; Moreno S,Yerko; Cordova A,Fernando.
Se llevó a cabo un experimento para evaluar el efecto de diferentes niveles de reposición hídrica aplicados en post cuaja y en post pinta sobre la calidad del vino en el cv. Cabernet Sauvignon (Vitis vinifera L.) durante la temporada de crecimiento 2000-2001 y 2001-2002. El viñedo está localizado en el Valle de Pencahue, VII Región de Chile (35º22' lat. Sur; 71º47' long. Oeste). El viñedo de 7 años de edad fue regado por goteo y conducido en espaldera simple. Los tratamientos de riego consistieron en la aplicación de 40, 70 y 100% de la evapotranspiración real de la vid (ETreal) durante los períodos de post cuaja y de post pinta. Los resultados mostraron que la mejor combinación de calidad de vinos fue obtenida al aplicar restricciones hídricas del 40%...
Tipo: Journal article
Palavras-chave: Estrés hídrico; Calidad del vino; Cabernet Sauvignon; Riego.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000400006

EFECTO DE DIFERENTES NIVELES DE HUMEDAD EN EL SUELO SOBRE EL DESARROLLO DEL CARBÓN DE LA PAPA (Angiosorus solani) EN DOS VARIEDADES DE PAPA (Solanum tuberosum) BAJO CONDICIONES DE INVERNADERO
Provedor de dados: 113
Autores: Sepúlveda R.,Paulina; López T.,Horacio; Nuñez L.,Diego.
El experimento tuvo como objetivo estudiar bajo condiciones de invernadero, el efecto de dos niveles de humedad en el suelo (20-25% y 50-55%), en el desarrollo del hongo Angiosorus solani inoculado artificialmente al suelo, donde se plantaron dos variedades de papa (Solanum tuberosum) Mirka y Cardinal, consideradas como resistente y susceptible a la enfermedad, respectivamente. Los porcentajes de humedad en el suelo se mantuvieron durante todo el período que duró el ensayo y la reposición de agua se realizó periódicamente en base a diferencias de peso. Se utilizó un diseño experimental completamente al azar con cinco repeticiones y una planta por repetición. Las variables medidas fueron emergencia, días de emergencia a cosecha, presencia de la enfermedad,...
Tipo: Journal article
Palavras-chave: Papas; Carbón de la papa; Variedades; Hongo del suelo.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000400001

Efecto de Diferentes Regímenes de Riego Sobre la Carga Frutal, Tamaño de Fruta y Rendimiento del Olivo cv. Sevillana
Provedor de dados: 113
Autores: Selles van Sch,Gabriel; Ferreyra E,Raúl; Selles M,Iván; Lemus S,Gamalier.
Con el objetivo de determinar el efecto de diferentes estrategias de riego deficitario controlado (RDC) en olivos (Olea europaea L.), se aplicaron cuatro tratamientos de riego, en tres temporadas, a un huerto de ocho años de edad, del cv. Sevillana, ubicado en la localidad de Tierras Blancas, San Felipe, V Región (32º47’ lat. Sur, 70º42’ long. Oeste, 800 m.s.n.m). Los tratamientos fueron: T1, regado con el equivalente al 100% de la evapotranspiración del cultivo (ETc) durante toda la temporada; T2, 100% de la ETc desde brotación hasta el término de la fase II de crecimiento del fruto y 40% durante la fase III; T3, 100% de la ETc desde brotación hasta el término de la fase II de crecimiento del fruto y 25% durante la fase III; y T4, 60% de la ETc durante...
Tipo: Journal article
Palavras-chave: Potencial hídrico xilemático; Conductancia estomática; Riego deficitario controlado.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000100006

EFECTO DE DIFERENTES TÉCNICAS DE MANEJO DE RESIDUOS DE LA COSECHA FORESTAL EN ALGUNAS PROPIEDADES DE UN SUELO KANDIUDULT EN EL NORESTE ARGENTINO
Provedor de dados: 113
Autores: Giuffré,Lidia; Fernández,Roberto; Lupi,Ana; Heredia,Olga S.; Pascale,Carla.
El objetivo de este trabajo fue evaluar el efecto de diferentes técnicas de manejo de residuos de Pinus ellioti Engelm en índices de calidad de suelo en un Kandiudult de Misiones, Argentina, en condiciones de altas temperaturas y precipitaciones. Los tratamientos fueron: T1) extracción manual de los residuos y reforestación; T2) quema y reforestación; T3) conservación de los residuos y reforestación; T4) conservación de los residuos y desarrollo de bosque secundario. El diseño estadístico fue en bloques completamente al azar con cuatro repeticiones, en bloques de 840 m². Las muestras de suelo fueron extraídas un año y medio después de implantados los tratamientos, por ser importante el monitoreo a corto plazo, dado que los cuatro primeros años son clave en...
Tipo: Journal article
Palavras-chave: Propiedades del suelo; Kandiudult; Residuos; Manejo.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100014

Efecto de Distintos Niveles de Poda y Reposición Hídrica sobre el Crecimiento Vegetativo, Rendimiento y Composición de Bayas en Vides cv. Cabernet Sauvignon
Provedor de dados: 113
Autores: Ortega-Farias,Samuel; Salazar Mejías,Rodrigo; Moreno Simunovic,Yerko.
Se llevó a cabo un experimento para evaluar el efecto de distintos niveles de poda y reposición hídrica sobre el crecimiento vegetativo, rendimiento y composición de bayas en un viñedo (Vitis vinifera L.) ubicado en el Valle de Pencahue, Región del Maule, Chile (35º22' lat. Sur; 71º47' long. Oeste), durante las temporadas de crecimiento 2003-2004 y 2004-2005. Se usó un cultivar Cabernet Sauvignon de 10 años de edad, regado por goteo y conducido en espaldera vertical simple. Los distintos niveles de poda fueron 12, 18 y 24 yemas por planta. Por otro lado, los niveles de riego consistieron en la reposición del 40, 70 y 100% de la evapotranspiración real de la vid (ETv) aplicado durante el período de cuaja a cosecha. Los resultados mostraron que al...
Tipo: Journal article
Palavras-chave: Poda; Reposición hídrica; Crecimiento vegetativo; Rendimiento; Composición de bayas; Cabernet Sauvignon.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400008

Efecto de Dos Sistemas de Determinación de Materia Seca en la Composición Química y Calidad del Ensilaje Directo de Avena en Diferentes Estados Fenológicos
Provedor de dados: 113
Autores: Dumont L,Juan Carlos; Anrique G,René; Alomar C,Daniel.
En el Centro Regional de Investigación Remehue, Instituto Nacional de Investigaciones Agropecuarias (INIA); Osorno, Chile, se realizó un estudio para conocer el efecto de dos métodos para determinar materia seca (MS) en la composición química de ensilajes directos de avena (Avena sativa L.) cv. Llaofén. La avena se cosechó en los estados de elongación de tallos (Temprano), emergencia de panoja (Medio) y grano lechoso-pastoso (Tardío). Las muestras de ensilaje se sometieron a secado en horno de ventilación forzada y destilación por tolueno. Entre los estados Temprano y Tardío, el rendimiento de MS base tolueno, aumentó de 4,7 a 9,7 t ha-1 y la MS tolueno, fibra detergente ácido (FDA) y fibra cruda (FC) aumentaron de 15,4 a 27,4%; 29,8 a 36,7% y de 25,2 a...
Tipo: Journal article
Palavras-chave: Avena; Ensilaje; Materia seca; Tolueno.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000400005

Efecto de Dosis Única Intraperitoneal de Cipermetrina en la Corteza Cerebral Somatosensorial de Ratones CF- 1
Provedor de dados: 77
Autores: Jiménez Venegas,Leonella; Quilodrán Peredo,Javier; Miranda Olivares,Juan Pablo; Rodríguez Bustos,Héctor.
La cipermetrina es un pesticida ampliamente utilizado en agricultura y en salud pública. Sus efectos histopatológicos a nivel de sistema nervioso central han sido poco estudiados, aún cuando se han demostrado casos de intoxicación en humanos, con importante compromiso neurológico. El propósito de este trabajo es conocer los efectos de una dosis única intraperitoneal de cipermetrina sobre la morfología neuronal de corteza somatosensorial (láminas superficiales y profundas) de ratones CF-1. 35 ratones fueron separados en tres grupos: control (n=5), control vehículo (n=15) y experimental (n=15); los dos últimos grupos sacrificados los días 1, 8, 18, 26 y 35, en grupos de a tres. Los encéfalos fueron removidos, fijados, y procesados con técnica de rutina, para...
Tipo: Journal article
Palavras-chave: Corteza somatosensorial; Apoptosis; Cipermetrina; Neurotoxicidad.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100003

Efecto de Estimulaciones Infrarrojas sobre Hepatoesteatosis Microvesicular Alcohólica de Ratas
Provedor de dados: 77
Autores: Cornejo,R; Matamala,F; Silva,H; Garrido,O; Jaramillo,R; Sáez,L; Painemil,S; Loncoñanco,E.
24 ratas hembras de 4 meses de vida con peso aproximado de 250 gramos fueron divididas en dos grupos de animales, A y B. Ambos grupos se mantuvieron con pellet y solución de alcohol 40% durante 60 días generándoseles una hepatoesteatosis microvesicular. Los hígados de los animales pertenecientes al grupo B fueron estimulados con láser infrarrojo 6 J/cm2 durante 15 días consecutivos. Posteriormente, las ratas fueron sacrificadas y se extrajeron muestras de hígado y luego procesadas para microscopía electrónica de transmisión. De ambos tipos celulares se obtuvieron microfotografías electrónicas de transmisión con aumentos finales de 8.500 X, las cuales fueron sometidas a estudios morfométricos para determinar fracciones volumétricas de los siguientes...
Tipo: Journal article
Palavras-chave: Esteatosis; Láser; Morfometría; Hepatocito.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100048

Efecto de Fuentes de Azufre Sobre el Rendimiento y Calidad de Trigo y Pradera en Dos Andisoles
Provedor de dados: 113
Autores: Alfaro,Marta; Bernier,René; Iraira,Sergio.
Two experiments were carried out to evaluate the effect of source and rate of sulphur (S) on yield and quality of a wheat (Triticum aestivum L.) crop and a permanent naturalized pasture in southern Chile. In the wheat trial, calcium sulphate (SCA) and magnesium sulphate (SMG) were tested (45 and 90 kg S ha-1). In the pasture trial, an additional potassium-magnesium sulphate (SKMG) treatment was considered. In both trials fertilizers were sprayed and a control treatment was included. In the wheat trial all aspects affecting yield components were evaluated: yield, nitrogen (N), phosphorus (P) and S concentration in plants and seed, and albumen quality were evaluated. In the pasture trial, the yield and nutritional quality (foliar concentration of N, P, S...
Tipo: Journal article
Palavras-chave: Protein; Digestibility; Gluten; Nutrient budgets balances; Proteína; Digestibilidad; Gluten; Balances de nutrientes.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000300007

Efecto de Herbicidas Aplicados Durante la Madurez del Grano de Trigo en el Rendimiento y Calidad del Grano
Provedor de dados: 113
Autores: Mellado Z,Mario; Pedreros L,Alberto .
Se realizaron siete ensayos en trigo harinero (Triticum aestivum L.), cultivar de primavera Domo-INIA, durante las temporadas 2001-2002 y 2002-2003, para evaluar el efecto de diversos herbicidas aplicados durante la madurez del grano de trigo sobre el rendimiento y calidad del grano. Se usó un diseño de bloques completos al azar con cinco tratamientos y cuatro repeticiones. La diferencia entre los ensayos fue el estado de madurez del trigo al momento de aplicar los herbicidas. Los herbicidas usados fueron: 2,4-D, glifosato, glifosato+MCPA, y paraquat, además, se incluyó un tratamiento testigo sin herbicida. Los parámetros evaluados fueron: rendimiento de grano, peso del hectolitro, peso de 1.000 granos, porcentaje de germinación, índice de sedimentación y...
Tipo: Journal article
Palavras-chave: Herbicidas de precosecha; Trigo.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000300009

Efecto de herbívoros y patógenos en la sobrevivencia y crecimiento de plántulas en un fragmento del bosque templado húmedo de Chiloé, Chile
Provedor de dados: 97
Autores: FIGUEROA,JAVIER A.; CASTRO,SERGIO A.
Las plántulas son susceptibles a las condiciones físicas del ambiente, al ataque de patógenos, defoliadores o herbívoros. Los objetivos del estudio fueron determinar el crecimiento y sobrevivencia de las plántulas arbóreas, la proporción de individuos dañados por herbívoros y patógenos, y el efecto de este daño sobre el crecimiento y la sobrevivencia de plántulas del bosque húmedo templado de Chiloé, Chile. La sobrevivencia fue menor en el período de verano y mayor en pleno invierno. Cuando finalizó la fase de monitoreo (11 meses), dos tercios de todas las plántulas sobrevivientes presentaban algún tipo de agresión. Las plántulas con cotiledones presentaban una proporción mayor de plántulas sanas, mientras que aquellas sin cotiledones presentaban una...
Tipo: Journal article
Palavras-chave: Herbivoría; Patógeno; Plántula; Chiloé; Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100015

Efecto de Inmersiones en Calcio Sobre Peteca en Limones Amarillos y Plateados, Cosechados Después de una Lluvia y Almacenados en Refrigeración
Provedor de dados: 113
Autores: Undurraga M,Pedro; Olaeta C,José A; Retamales A,Jorge; Brito P,Alejandra.
La peteca es un desorden fisiológico que produce daño en la corteza de limones (Citrus limon (L.) Burm. f.), afectando la calidad de la fruta. El objetivo de este ensayo fue evaluar en limones cv. Génova, amarillos y plateados, el efecto de inmersiones de calcio en poscosecha, sobre la incidencia de peteca en almacenaje refrigerado de frutos sometidos a un estrés producido por lluvia. La fruta fue cosechada 3, 6 y 9 días después de una lluvia, y sometida a una inmersión, en soluciones de: nitrato de calcio 0,8%, cloruro de calcio al 0,5% y 1% de producto comercial, siendo posteriormente almacenada a 7ºC, por 0; 15; 30 y 45 días. Se evaluó presencia de peteca y contenido de calcio total en la corteza. Además, se efectuó un análisis histológico de los frutos...
Tipo: Journal article
Palavras-chave: Peteca; Calcio; Limones; Madurez; Cortes histológicos.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000100001

EFECTO DE LA ACIDIFICACIÓN DEL SUSTRATO Y DEL AGUA DE RIEGO EN LA NUTRICIÓN, DESARROLLO Y PRODUCCIÓN DE ARÁNDANO OJO DE CONEJO (Vaccinium ashei Reade)
Provedor de dados: 113
Autores: Ferreyra E.,Raúl; Peralta C.,José; Sadzawka R.,Angélica; Muñoz S.,Carlos; Valenzuela B.,Jorge.
La zona central de Chile reúne condiciones climáticas adecuadas para el desarrollo del arándano ojo de conejo (Vaccinium ashei Reade), sin embargo existen limitantes para su desarrollo debido al alto pH de los suelos, a la porosidad y a la calidad del agua utilizada para el riego. Se realizó un experimento en el Centro Regional de Investigación La Platina, del Instituto de Investigaciones Agropecuarias, en Santiago, para determinar el efecto del uso de una mezcla de suelo-aserrín acidificada, así como también del agua de riego con pH 2, 4, 5 y 7,8 (testigo), para lo cual se plantó arándano ojo de conejo el año 1990. El crecimiento y la producción se evaluaron durante tres temporadas. El análisis foliar mostró que sólo la concentración de Mn fue menor en el...
Tipo: Journal article
Palavras-chave: Acidificación de suelos acidificación de agua de riego; Calidad de agua riego por goteo nutrición de plantas.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000400007

EFECTO DE LA ADICIÓN DE BIOSOLIDOS URBANOS Y DE SALMONICULTURA SOBRE LA GERMINACIÓN DE SEMILLAS DE LECHUGA (Lactuca sativa L.) EN UN SUELO PATAGONICO
Provedor de dados: 127
Autores: Celis,José; Sandoval,Marco; Zagal,Erick; Briones,Mario.
Los biosólidos de las aguas domiciliarias y de la industria de la salmonicultura han aumentado notoriamente en los últimos años en Chile. Esto ha generado la urgente necesidad de buscar alternativas para su disposición final, de tal forma que no constituyan riesgo para la salud y el medioambiente. En el presente estudio se analizaron los efectos sobre la germinación de semillas de lechuga como consecuencia de la aplicación de este tipo de biosólidos orgánicos en un suelo Andic cryofluvents degradado patagónico. Los biosólidos se adicionaron al suelo, los tratamientos fueron: lodo urbano (BU), biosólido de piscicultura (BP) y biosólido de salmonicultura en lago (BL) a diferentes tasas: 25, 50, 75, 100 y 150 Mg ha-1. Se usó un testigo, consistente en suelo...
Tipo: Journal article
Palavras-chave: Residuos de salmonicultura; Fitotoxicidad; Lodo urbano; Fertilizante orgánico; Biosólidos.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000300002

EFECTO DE LA ADICIÓN DE COMPOST SOBRE PROPÁGULOS MICORRÍCICOS ARBUSCULARES EN UN SUELO VOLCÁNICO DEL CENTRO SUR DE CHILE
Provedor de dados: 127
Autores: Millaleo M,Rayen; Montecinos U,Camila; Rubio H,Rosa; Contreras N,Aliro; Borie B,Fernando.
Los abonos orgánicos afectan características químicas y biológicas de los suelos contribuyendo a la sustentabilidad de los agroecosistemas. El objetivo del estudio fue evaluar el efecto, en condiciones de invernadero, de la adición de compost en un Ultisol sobre parámetros fúngicos como colonización radical, micelio y esporas, junto con parámetros químicos de suelo y nutricionales de tres cultivos (trigo, frejol y pradera) después de cosecha. El compost fue elaborado con desechos ganaderos y vegetales y aplicado en dosis equivalentes a 8, 20 y 30 Mg ha-1en base a materia seca. Las raíces de todos los cultivos presentaron mayor colonización de hongos micorrícicos arbusculares (HMA) con la dosis más alta, mientras que la longitud hifal fue significativamente...
Tipo: Journal article
Palavras-chave: Compost; Ultisol; Leguminosa; Gramínea; Agricultura orgánica; Micorrizas arbusculares.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000300003

Efecto de la Adición de Residuos de Cosecha y de un Hongo Micorrizógeno Sobre el Crecimiento Trigo y Parámetros Químicos y Biológicos de un Andisol
Provedor de dados: 113
Autores: Yonathan,Redel; Rubio,Rosa; Borie,Fernando.
Entre las diversas prácticas agrotecnológicas aplicables a sistemas agrícolas de baja inversión, se consideran la adición de residuos de plantas como una fuente de nutrientes, y el manejo adecuado de la simbiosis micorriza arbuscular (MA). Por ello, el objetivo general de este estudio fue determinar el efecto de la aplicación de residuos de cosecha e inoculación micorrízica sobre el desarrollo y nutrición mineral de plantas de trigo (Triticum aestivum L.) creciendo en un suelo ácido (Typic Distrandepts) y algunos parámetros químicos y biológicos del suelo. Residuos de lupino (Lupinus albus L.) y de trigo se adicionaron al suelo a una dosis equivalente a 6 Mg ha-1, sobre el cual se sembró trigo cv. Otto, con y sin inoculación de una cepa nativa de un hongo...
Tipo: Journal article
Palavras-chave: Residuos de cosecha; Micorriza arbuscular; Adquisición de minerales; Suelos ácido.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000200008

Efecto de la Administración de Ácido Retinoico Sobre el Desarrollo del Esqueleto Axial en Embriones de Ratón Mus musculus
Provedor de dados: 77
Autores: Ojeda Moris,Gladys; López Tardón,Yocelyn; Díaz Navarrete,Marcela; Rojas Rauco,Mariana.
El déficit y exceso de vitamina A provoca malformaciones congénitas que afectan distintos órganos y sistemas. El objetivo de este estudio fue determinar el efecto que causa la administración de ácido retinoico a distintas dosis sobre la morfogénesis ósea del esqueleto axial en embriones de ratón Mus musculus. Mediante aleatorización simple se distribuyeron hembras recién preñadas en 4 categorías: A, B, C y D. El día 8 post fecundación (p.f), se administró 40 mg/kg de peso de ácido retinoico al grupo A, 20 mg/kg de peso de esta solución al grupo B, 1 ml/kg de peso de dimetil sulfóxido al grupo C, y el grupo D es grupo control. El día 17 de la gestación las hembras y sus fetos fueron anestesiadas y eutanasiadas con sobredosis de pentotal sódico...
Tipo: Journal article
Palavras-chave: Ácido retinoico; Esqueleto axial; Malformaciones congénitas; Mus musculus; Feto; Ratón.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400051

Efecto de la Aplicación de Herbicidas en Condiciones de Campo Sobre Algunas Actividades Biológicas
Provedor de dados: 127
Autores: Alvear Z,Marysol; López E,Roxana; Rosas G,Analí; Espinoza N,Nelsón.
Se realizó un ensayo en un suelo Andisol de la IX Región con el objetivo de determinar el efecto de diferentes herbicidas aplicados en cultivos anuales tradicionales sobre las actividades biológicas del suelo. Los cultivos y herbicidas aplicados en cada caso correspondieron a trigo-MCPA+metsulfuron-metil, lupìno-simazina, raps-trifluralina y un testigo sin aplicación de herbicidas. En general, todas las actividades biológicas fueron afectadas negativamente por los distintos tratamientos de herbicidas (p&lt; 0,05) en el primer y segundo muestreo respecto al testigo. Entre las actividades generales, el C y N biomásico fueron afectados negativamente por la trifluralina y el MCPA+metsulfuron-metil, mientras que la dehidrogenasa fue afectada significativamente...
Tipo: Journal article
Palavras-chave: Biomasa microbiana; Actividades enzimáticas; Herbicidas; Dehidrogenasa; Fosfatasa ácida; Cultivos anuales.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000100007

Efecto de la Aplicación de Láser de Baja Potencia Sobre la Mucosa Oral Lesionada
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Lara Sepulveda,María Constanza; Cantín López,Mario Gonzalo; Zavando Matamala,Daniela Alejandra.
La utilización del láser ha tenido una constante evolución y desarrollo. Se ha comprobado en numerosos estudios los efectos bioestimulantes que la irradiación láser de baja potencia produce al interactuar con los tejidos y células. Este estudio pretende determinar la existencia de diferencias morfológicas en la mucosa oral lesionada, posterior a la irradiación con láser de baja potencia, a través de cambios en la densidad vascular del plexo subpapilar de la mucosa oral. Se utilizaron 15 ratas Sprague Dawley, las cuales se dividieron en tres grupos. A la totalidad de los animales se les lesionó la mucosa oral, en la zona media del frenillo labial inferior. El grupo I se tomó como control; al grupo II se le aplicó láser de baja potencia sobre la mucosa oral...
Tipo: Journal article
Palavras-chave: Laserterapia de baja potencia; Láser bioestimulación; Mucosa oral.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300008

EFECTO DE LA CERO LABRANZA SOBRE ALGUNAS ACTIVIDADES BIOLÓGICAS EN UN ALFISOL DEL SUR DE CHILE
Provedor de dados: 127
Autores: Alvear Z,Marysol; Pino B,Mario; Castillo R,Carlos; Trasar - Cepeda,Carmen; Gil - Sotres,Fernando.
Dada la necesidad de estabilizar y proteger los suelos, de los procesos de degradación, han surgido prácticas agronómicas conservacionistas, entre ellas, la cero labranza (CL). La medición de la biomasa microbiana (BM), junto a la determinación de algunas actividades enzimáticas en el suelo, fueron evaluadas ya que, son muy sensibles a los cambios producidos en el entorno. El objetivo de este estudio fue determinar algunas actividades biológicas en un Alfisol del sur de Chile sometido a un manejo de CL. Las actividades evaluadas fueron carbono (C) y nitrógeno (N) de la biomasa microbiana (CBM y NBM, respectivamente), mineralización del N, actividades dehidrogenasa y catalasa y algunas actividades enzimáticas hidrolíticas representativas de los diferentes...
Tipo: Journal article
Palavras-chave: Cero labranza; Actividades enzimáticas; Biomasa microbiana; Mineralización de N.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000200004

Efecto de la clorosis férrica en el tamño y la concentración de aceite en el fruto del palto (Persea americana Mill.)
Provedor de dados: 113
Autores: Razeto,Bruno; Palacios,Johanna.
Con el objetivo de determinar en qué medida la clorosis férrica influye en el tamaño y el contenido de aceite en el fruto de palto (Persea americana Mill.) se realizó un estudio en un huerto de 22 años cv. Hass, ubicado en Quillota, Chile (32º51’ lat. Sur, 71º6’long. Oeste). Se seleccionaron 12 árboles con distinto grado de clorosis férrica, desde algunos con follaje verde normal hasta otros severamente cloróticos. Con fecha 30 de agosto se colectaron 15 frutos y 30 hojas por árbol. En estas muestras se determinó la concentración de hierro mediante espectrofotometría. En la piel del fruto y en las hojas se midió color con colorímetro triestímulo y concentración de clorofila mediante extracción con etanol y medición de absorbancia en espectrofotómetro....
Tipo: Journal article
Palavras-chave: Deficiencia de hierro; Clorofila; Cv. Hass.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100013

Efecto de la cobertura del suelo con cascarilla de arroz en el crecimiento y rendimiento del tomate de ramillete
Provedor de dados: 118
Autores: Rodríguez Rodríguez,Gisela.
En la primavera al otoño del año 2005, en el norte de Kanto, localizado en el centro de Japón se preparó un área de campo para cultivar tomate de ramillete (tomate cherry) (Lycopersicon esculentum var. cerasiforme) con tres tipos de cobertura: 1. Paja de arroz con salvado de arroz, 2. Paja de arroz solamente y 3. Cobertura con polietileno. La cosecha de los frutos se realizó desde junio hasta finales de septiembre. Hubo diferencias significativas entre los tratamientos, en el rendimiento total de los frutos (p = 0,0379) y el de frutos normales (p = 0,0458). Las mayores producciones de frutos totales (3,4 kg•planta-1 ) se obtuvieron con el tratamiento de paja de arroz con salvado de arroz, seguido por los otros dos tratamientos con alrededor de 2,5...
Tipo: Journal article
Palavras-chave: Cobertura orgánica; Lycopersicon esculentum; Mulch de paja de arroz; Mulch de salvado de arroz; Tomate cherry; Tomate enano.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000300006

EFECTO DE LA DEFOLIACIÓN EN TRES MOMENTOS FENOLÓGICOS SOBRE EL RENDIMIENTO EN TOMATE (Lycopersicon esculentum Mill.) EN INVERNADERO
Provedor de dados: 113
Autores: Martínez,Susana; Grimaldi,María Cecilia; Garbi,Mariana; Artur,Miguel.
En La Plata, Argentina (34°58’ lat. Sur, 57°54’ long. Oeste) se condujo un cultivo de tomate (Lycopersicon esculentum Mill.) bajo cobertura plástica con el objetivo de evaluar el efecto sobre el rendimiento de la eliminación de la tercera hoja entre racimos en tres estados fenológicos del racimo: T1) testigo sin defoliar; T2) poda en floración (todas las flores abiertas); T3) poda en caída de pétalos; T4) poda con fruto de 10 mm de diámetro ecuatorial. Los híbridos FA 144 y Fortaleza fueron sometidos a los tratamientos de defoliación hasta el quinto racimo. El rendimiento final y el de las categorías comerciales que lo conforman fueron registrados hasta la cosecha del 7º racimo. Todos los tratamientos de defoliación condujeron a una elevación del...
Tipo: Journal article
Palavras-chave: Poda de hoja; Fenología.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000400015

EFECTO DE LA DEFOLIACIÓN SOBRE LA DINÁMICA DEL CRECIMIENTO DE TRITICALE
Provedor de dados: 113
Autores: Saroff,Cecilia; Pagliaricci,Héctor; Ferreira,Víctor.
En triticale (x Wittmack) forrajero se estudiaron los efectos del momento de utilización y la carga animal sobre la dinámica del crecimiento. Se empleó el cv. ‘Quiñé-UNRC’ pastoreado en estado vegetativo (EV) y reproductivo (ER) con tres niveles de carga animal: C1 = 2, C2 = 3 y C3 = 5 novillos ha-1. El diseño estadístico fue bloques completos al azar con arreglo factorial. Al inicio se determinó biomasa, área foliar, número de macollos y altura de plantas. En los rebrotes se analizaron las tasas de aparición y elongación de hojas, densidad de macollos y biomasa acumulada. Luego se calculó la vida media foliar (VMF) y las tasas de crecimiento (TCC) y senescencia del cultivo (TSC). En la situación inicial, C1 presentó mayor biomasa, área foliar y altura de...
Tipo: Journal article
Palavras-chave: Triticale estado fenológico carga animal crecimiento biomasa; X Triticosecale.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000300006

EFECTO DE LA DENSIDAD DE PLANTACIÓN SOBRE EL RENDIMIENTO DE CEBOLLA cv. COBRIZA INTA CON RIEGO POR GOTEO
Provedor de dados: 113
Autores: Lipinski,V. M.; Gaviola,Silvia; Gaviola,J.C.
Se estudió el efecto de diferentes densidades de plantación en el rendimiento de cebolla (Allium cepa L.) de día largo cv. Cobriza INTA. Para ello se realizó un ensayo en el Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria La Consulta, Mendoza, Argentina, en un suelo franco arenoso profundo (Typic Torrifluvent). El ensayo fue manejado con riego por goteo usando cinta T-Tape 510-30 enterrada a 2 cm en el centro de la cama de plantación. El diseño fue de bloques al azar con 4 repeticiones. Los tratamientos fueron cuatro densidades de plantación: 30 (D30), 40 (D40), 50 (D50) y 60 (D60) plantas m-2 en tresbolillo, dispuestas en 4 hileras en D30, D40 y D50 y 6 hileras para D60. La población inicial de plantas se redujo a...
Tipo: Journal article
Palavras-chave: Cebolla de día largo; Densidad de plantación; Allium cepa L.; Riego.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000400009

EFECTO DE LA DENSIDAD DE SEMILLAS EN LA GERMINACIÓN DE TRES ESPECIES DEL GÉNERO ASTROPHYTUM (CACTACEAE)
Provedor de dados: 73
Autores: Muro-Pérez,Gisela; Jurado,Enrique; Flores,Joel; Sánchez-Salas,Jaime.
Se colectaron frutos de poblaciones naturales de Astrophytum capricorne, A. myriostigma y A. ornatum en Coahuila, Durango e Hidalgo, respectivamente, con el objetivo de evaluar el efecto de la agrupación de semillas en la germinación, comparando tratamientos de 10 semillas agrupadas y 10 semillas no agrupadas (individuales). Las tres especies mostraron mayor porcentaje de germinación en semillas individuales. La germinación fue igual de rápida en semillas agrupadas e individuales para las tres especies. Estos resultados contrastan con el fenómeno de "rivalidad entre hermanos" que plantea la inhibición de la germinación en altas densidades como un mecanismo para evitar la competencia entre semillas hermanas con el fin de disminuir la competencia entre...
Tipo: Journal article
Palavras-chave: Dispersión agrupada de semillas; Competencia entre plántulas.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100003

Efecto de la densidad poblacional en la productividad de caracoles (Helix aspersd) en un sistema a cielo abierto alimentados con acelga y suplemento alimentario balanceado
Provedor de dados: 118
Autores: González,Olga; Pérez Camargo,Gladys; Membiela,Macarena; Frezza,Diana; Bartoloni,Norberto; Vieites,Carlos.
La helicicultura es una actividad practicada en diversas regiones del mundo que ha sido promocionada en Argentina en los últimos años. Sin embargo, su expansión se ha limitado por diversos factores que han impedido lograr una producción adecuada a escala comercial. Entre estos factores se destacan la imposibilidad de obtener una cantidad adecuada de producto terminado y la dificultad de mantener una oferta forrajera acorde con las necesidades. En el presente trabajo se estudió la influencia de la densidad de cría (50, 100 y 200 caracoles m²) y la suplementación con alimento balanceado en la producción final de caracoles (Helix aspersa), para un sistema abierto y por unidad de superficie productiva. El peso vivo promedio final no mostró diferencias...
Tipo: Journal article
Palavras-chave: Alimentación; Caracoles; Densidad; Helicicultura; Producción en cautiverio.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300002

Efecto de la Desnutrición Oculta Prenatal Sobre la Histología del Esplenio Callosal
Provedor de dados: 77
Autores: Olivares,R; Soto-Moyano,R; Hernández,A; Gil,J; Gimeno,M; Laborda,J; Aboitiz,F.
Ratas malnutridas prenatalmente con una dieta isocalórica y baja en proteínas, presentaron un menor diámetro axonal promedio en el esplenio callosal que los animales control, tanto de las fibras mielínicas como amielínicas. También se observó una mayor densidad axonal promedio, con respecto a los controles. Estas observaciones sugieren que: 1) las conexiones cortico-corticales (interhemisféricas) son vulnerables a la malnutrición proteica; y 2) lo anterior tendría incidencia en la velocidad de conducción interhemisférica, en particular con lo que dice relación con las conexiones visuales
Tipo: Journal article
Palavras-chave: Cuerpo Calloso; Esplenio; Malnutrición proteica prenatal; Axones; Fibras; Visión; Rata.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400009

Efecto de la estructuración por macrófitas y por recursos alimentarios en la distribución horizontal de tecamebas y rotíferos en un lago andino patagónico
Provedor de dados: 97
Autores: BASTIDAS-NAVARRO,MARCELA; MODENUTTI,BEATRIZ.
La presencia de macrófitas en la zona litoral lacustre trae aparejada condiciones diferentes con respecto a la zona pelágica, en particular en la disponibilidad de recursos. Por esta razón, las zonas litorales pueden presentar una mayor biodiversidad. En este trabajo se analizó la distribución horizontal de tecamebas y rotíferos en el lago Escondido (Argentina), vinculándola con los recursos alimentarios presentes en las diferentes zonas. Se tomaron muestras para el estudio del fitoplancton y zooplancton durante verano y primavera (2001-2003) en cuatro estaciones litorales y una pelágica. Se realizó el recuento de rotíferos y tecamebas y se determinó la abundancia y la biomasa fitoplanctónica. Los recursos alimentarios fueron clasificados en nanoplancton...
Tipo: Journal article
Palavras-chave: Zona litoral; Zona pelágica; Tecamebas; Rotíferos; Recursos algales.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000300008

Efecto de la fertilización con nitrógeno, fósforo y potasio, sobre el contenido foliar de carbohidratos, proteínas y pigmentos fotosintéticos en plantas de Berberidopsis corallina Hook.f.
Provedor de dados: 73
Autores: LATSAGUE,MIRTHA; SÁEZ,PATRICIA; MORA,MARIELA.
Un número substancial de publicaciones se relacionan con aspectos de fertilización y nutrición de especies leñosas exóticas, principalmente en Eucalyptus spp. y Pinus spp., siendo escasa la información para especies nativas. Berberidopsis corallina (Berberidopsidaceae) es una especie endémica de Chile en peligro de conservación para la cual no existe antecedentes de fertilización. El objetivo de esta investigación es contribuir con nuevos antecedentes sobre el efecto estimulador de la fertilización con nitrógeno (N), fósforo (P) y potasio (K) en el contenido bioquímico foliar en B. corallina, como información base para su conservación. Un experimento de invernadero en condiciones controladas de temperatura y riego fue conducido para evaluar el efecto de la...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100007

EFECTO DE LA FERTILIZACIÓN NITROGENADA INVERNAL SOBRE LA ACUMULACIÓN DE FORRAJE DE UN PASTIZAL NATURAL DE LA PAMPA DEPRIMIDA, ARGENTINA
Provedor de dados: 113
Autores: Fernández Grecco,Roberto.
Con el objetivo de cuantificar el efecto del nitrógeno en el crecimiento invernal de los pastizales de la Pampa Deprimida, se realizó el presente experimento en Chascomús, Buenos Aires, Argentina. Sobre una comunidad de media loma y utilizando un diseño en bloques completos al azar con tres repeticiones se evaluaron seis dosis de nitrógeno: N0, N50, N100, N150, N200 y N250 kg N ha-1 (urea: 46% N) aplicados el día 12/08/1997. La acumulación de forraje se determinó mediante cortes realizados los días 20/09, 29/09, 08/10, 20/10, 30/10 y el 04/11 de 1997, cortando los 5 m² centrales de parcelas de 1,5 x 5 m. Las comparaciones estadísticas se realizaron mediante análisis de la varianza, y por regresión lineal se determinaron las tasas de crecimiento. La...
Tipo: Journal article
Palavras-chave: Pastizal natural; Fertilización nitrogenada; Crecimiento acumulación de forraje.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000300007

Efecto de la fertilización nitrogenada sobre el rendimiento y el color de cultivares de ajo (Allium sativum) colorado
Provedor de dados: 118
Autores: Gaviola,Silvia; Lipinski,Víctor M.
El objetivo de este trabajo fue evaluar el efecto de la fertilización nitrogenada sobre el rendimiento y color de cultivares de ajo (Allium sativum L.) colorado. El estudio se realizó en condiciones de campo en el INTA, EEA La Consulta, Mendoza, Argentina. El diseño experimental fue en parcelas divididas dispuestas en bloques completos al azar de tres repeticiones. El factor dosis de nitrógeno (0,75,150 225 y 300 kg•ha-1 de N) se asignó a las parcelas principales y los cultivares Fuego, Sureño, Gostoso, INCO 30 y Rubí a las subparcelas. El color de los dientes del ajo se determinó con la ayuda de un reflectómetro Minolta modelo CR-400. Los cultivares y la dosis de fertilización nitrogenada tuvo un efecto significativo (p &lt; 0,0001) sobre los rendimientos...
Tipo: Journal article
Palavras-chave: Ajo color fertilización; Nitrógeno reflectrometría.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000100007

EFECTO DE LA FERTILIZACIÓN NITROGENADA SOBRE RENDIMIENTO Y CALIDAD DE FRUTA EN FRAMBUESO (Rubus idaeus L.) BAJO DOS PROGRAMAS DE FERTIRRIGACIÓN
Provedor de dados: 127
Autores: Quezada,Celerino; Vidal,Iván; Lemus,Luis; Sánchez,Héctor.
El objetivo de este estudio fue evaluar el efecto de la fertilización nitrogenada en el rendimiento y calidad de frutos de frambuesas (Rubus idaeus L.) cv. Heritage . El experimento de campo se realizó durante la temporada 2002-2003 en un suelo franco limoso (Typic Melanoxerands), en un huerto de dos años regado por goteo. Se aplicaron tres dosis de nitrógeno en la forma de urea equivalentes a 25, 50 y 100 kg N ha-1 mediante dos frecuencias de fertirrigación : permanente (FP) y única (FU), además de un testigo sin aplicación. La FP fue aplicada durante toda la temporada en cada riego (43 parcialidades), y la FU se aplicó al inicio de la temporada en noviembre. La dosis de 100 kg ha-1 aplicada como FU resultó ser el mejor tratamiento tanto en rendimiento...
Tipo: Journal article
Palavras-chave: Riego por goteo; Dosis de nitrógeno; Frambuesas.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000300001

Efecto de la fragmentación del hábitat sobre la calidad de las semillas en Lapageria rosea
Provedor de dados: 97
Autores: HENRÍQUEZ,CAROLINA A.
La fragmentación del hábitat tiene un efecto negativo sobre la adecuación biológica de las plantas por la reducción en la cantidad de semillas producidas. Sin embargo, la fragmentación del hábitat también podría disminuir la adecuación biológica de las plantas a través de la reducción en la calidad de las semillas producidas, al reducir atributos como la viabilidad, tamaño o su capacidad germinativa. Esto podría ocurrir porque la reducción en los tamaños poblacionales en fragmentos, junto con el aumento en el grado de aislamiento, podrían generar una reducción de la variabilidad genética de las poblaciones e inducir a la expresión de depresión por endocruza. En este trabajo muestro el efecto de la fragmentación del bosque maulino sobre la calidad de las...
Tipo: Journal article
Palavras-chave: Fragmentación del hábitat; Semillas; Lapageria rosea; Chile central.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000100013

Efecto de la fragmentación forestal sobre la estructura vegetacional de las poblaciones amenazadas de Legrandia concinna (Myrtaceae) del centro-sur de Chile
Provedor de dados: 97
Autores: ALTAMIRANO,ADISON; ECHEVERRÍA,CRISTIAN; LARA,ANTONIO.
La fragmentación del hábitat es una de las principales amenazas para la integridad de los ecosistemas. En este estudio se evaluó el efecto de la fragmentación sobre la estructura de la vegetación en poblaciones de la especie arbórea Legrandia concinna en el centro-sur de Chile. Se describió el patrón de ocupación de las poblaciones de Legrandia en fragmentos remanentes de bosques nativos y se evaluaron las relaciones entre índices de paisaje y variables de estructura de la vegetación. Los índices de paisaje (área, índice de proximidad media, forma y distancia al borde de fragmentos) fueron aplicados a mapas de cobertura forestal generados a partir de una imagen satelital Landsat ETM+ del año 2001. Los resultados mostraron una alta predominancia de...
Tipo: Journal article
Palavras-chave: Legrandia concinna; Fragmentación; Índices de paisaje; Conservación.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000100003

Efecto de la Maca Peruana (Lepidium meyenii) y de la Melatonina Sobre el Desarrollo Testicular del Ratón Expuesto a Hipoxia Hipobárica Continua
Provedor de dados: 77
Autores: Valenzuela-Estrada,Mario; Parra,Roberto; Velasco-Martín,Juan P; Núñez,Hipólito; Regadera,Javier; Bustos-Obregón,Eduardo.
El estudio de la hipoxia hipobárica (HH) determina un problema de salud pública y laboral en poblaciones que habitan en zonas de altura. La disminución del oxígeno afecta a diferentes órganos, incluyendo el testículo. El organismo responde frente a la hipoxia estimulando la angiogénesis, el flujo sanguíneo testicular e incrementa la temperatura intraescrotal, lo cual produce un daño de la espermatogénesis. Nuestro estudio valoró el efecto que produce la HH sobre el testículo del ratón. Se utilizó una cámara hipobárica regulada a 4.200 metros sobre el nivel del mar (msnm), en periodos de hipoxia durante 8,3; 16,6 y 24,9 días, en comparación a un grupo control en normoxia (500 msnm). En estos tres grupos, a unos ratones se administró melatonina, a otros maca...
Tipo: Journal article
Palavras-chave: Hipoxia; Testículo; Maca; Melatonina; Poblaciones de Altura.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100012

EFECTO DE LA MATERIA ORGÁNICA Y EL MANEJO SOBRE LA HIDROFOBICIDAD DE SUELOS VOLCÁNICOS
Provedor de dados: 127
Autores: Cuevas Becerra,José.
La repelencia al agua o hidrofobicidad de los suelos depende de una fuerte interacción entre las fracciones minerales y orgánicas del suelo. El contenido de materia orgánica condicionara de manera importante el monto de la repelencia, pero no todo el Carbono orgánico es repelente, y mas que el monto total de compuestos orgánicos, son sus características traducidas como calidad de materia orgánica, la que incidirá sobre los montos de hidrofobicidad. Es posible encontrar dos tipos de repelencias, naturales e inducidas. La repelencia se origina por los cambios en las magnitudes de las fuerzas intermoleculares eléctricas que actúan en la interfase de sólido-liquido-gas pudiendo ser evaluada a través del ángulo de contacto (&amp;#952;) entre estas fases. Existe...
Tipo: Journal article
Palavras-chave: Sistema poroso del suelo; Suelos hidrófobos; Ángulo de contacto.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000200002

EFECTO DE LA NUTRICIÓN MINERAL SOBRE LA PRODUCCIÓN DE CULÉN (Otholobium glandulosum (L.) Grimes)
Provedor de dados: 113
Autores: Hirzel,Juan; Rodríguez,Nicasio; del Valle,Pedro.
El culén (Otholobium glandulosum (L.) Grimes) es una planta medicinal que ha adquirido gran importancia en los últimos años por su contenido de psolareno. Este estudio tuvo como objetivo generar antecedentes sobre la fertilización de este cultivo. Para tal efecto, se realizó un experimento en macetas con plantas de 2 años, sobre dos substratos de crecimiento, arena de río y suelo trumao (Serie Santa Bárbara, Hashy, mesic typic haploxerands). El ensayo contó con nueve tratamientos de fertilización y cuatro repeticiones en cada substrato. Los tratamientos fueron: fertilización completa (N, P, K, Ca, Mg, S y microelementos), siete tratamientos con fertilización completa excluyendo sólo un nutriente de los señalados, y un tratamiento testigo sin fertilización....
Tipo: Journal article
Palavras-chave: Otholobium glandulosum; Culén; Nutrición minera; Planta medicinal.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000300008

Efecto de la propagación asexual y prolongación del período vegetativo de Morus alba en la producción de capullos de seda
Provedor de dados: 118
Autores: Pelicano,Alicia; Divo de Sesar,Marta; Zamuner,Norma; Danelón,José Luis; Yoshida,Miriam.
El objetivo de este trabajo fue determinar un protocolo eficiente para la propagación vegetativa de la morera {Morus alba). Al mismo tiempo tuvo el propósito de evaluar la influencia de este protocolo de propagación en la alimentación de las larvas de Bombyx mor i y en el porcentaje de seda cruda producido. Plantas de morera, propagadas vegetativamente, fueron transplantadas a macetas de 4 L, tratadas con N:P:K (15:15:15, 15 g) (F) y/o 6-bencilaminopurina (5 mg-L -1) (Ck). En otoño y primavera, se utilizaron hojas para la alimentación de una cohorte de larvas de tercer estadio. Se observó que el 60% de las plantas tratadas con Ck brotaron en julio y las restantes lo hicieron en agosto. Aunque las plantas fertilizadas (TF) y fertilizadas y tratadas con...
Tipo: Journal article
Palavras-chave: Bombyx morí; Citoquinina; Morus alba.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000200001

Efecto de la radiación ultravioleta-B sobre el crecimiento y la fotosíntesis de siete variedades de trigo (Triticum aestivum L.)
Provedor de dados: 97
Autores: PINTO,MANUEL; LIZANA,CAROLINA; PASTENES,CLAUDIO; RIQUELME,ALEJANDRO; BERTI,MARITZA.
Con el fin de determinar la sensibilidad a la radiación UV-B de variedades de trigo cultivadas en Chile, plantas de las variedades ERP- V8, Lilén, Millaleu, Nobo, Reihue, Talhuén y Huayún, fueron irradiadas durante las seis primeras semanas de crecimiento con 22,5 µW cm-2 de radiación UV-B, durante 4 horas diarias y bajo una intensidad de radiación visible promedio de 400 µmol m-2 s-1 (12 h de fotoperíodo). En función de la respuesta en crecimiento (peso fresco y seco y área foliar) al tratamiento UV-B, las variedades Talhuén Lilén y Nobo, resultaron ser los más sensibles. En todas las variedades la cantidad de compuestos absorbedores de UV-B aumentó como resultado del tratamiento con radiación UV-B. Sin embargo, no se observó una relación clara entre este...
Tipo: Journal article
Palavras-chave: Radiación UV - B; Fotosíntesis; Crecimiento; Variedades de trigo; Triticum aestivum L.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100007

EFECTO DE LA SUPLEMENTACIÓN DURANTE EL PERIPARTO SOBRE ALGUNOS PARÁMETROS PRODUCTIVOS Y REPRODUCTIVOS DE LA OVEJA SUFFOLK-DOWN Y SU CORDERO EN EL SECANO INTERIOR DE LA PROVINCIA DE CAUQUENES
Provedor de dados: 113
Autores: Avendaño R.,Julia; Imbarach A.,Guillermo.
La pradera natural de la provincia de Cauquenes, VII Región de Chile, somete a los ovinos a condiciones nutricionales desfavorables desde fines de la gestación al postparto temprano. Bajo las condiciones de manejo de un sistema productivo tradicional de la zona, se estudió el efecto de la suplementación durante el periparto de ovejas Sulffolk-Down sobre el peso vivo, la condición corporal, parámetros productivos y reproductivos, en pastoreo y sobre el peso vivo de su cordero. Veinticinco ovejas consumieron un suplemento que, junto con la pradera, cubrió el 100% de sus requerimientos (T100); un segundo grupo recibió el 50% del suplemento (T50) del primer grupo, y un tercero se mantuvo sólo a pradera (T0). La suplementación mejoró el peso vivo (44,5 a; 48,0...
Tipo: Journal article
Palavras-chave: Suplementación; Producción ovina; Parámetros productivos; Parámetros reproductivos.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100011

Efecto de la temperatura, el estrés hídrico y luminoso sobre la heterogeneidad del fotosistema II en cuatro variedades de poroto (Phaseolus vulgaris L.)
Provedor de dados: 97
Autores: GONZÁLEZ,JAVIERA; PASTENES,CLAUDIO; HORTON,PETER.
Las plantas superiores, requieren de mecanismos que permitan proteger a los centros fotosintéticos de daño oxidativo, particularmente en condiciones ambientales que determinen una absorción luminosa en exceso de su capacidad de utilización fotoquímica, como son las altas intensidades de luz, propiamente tal, restricción de agua y aumentos de temperatura. En el mediano y largo plazo los centros PSII tendrían la capacidad de modificar su localización y estructura, formando los centros PSII del tipo ß y los estados de transición, cuya variación no depende, exclusivamente, de la intensidad luminosa. En el presente estudio se determinó el efecto de distintos estreses ambientales sobre la heterogeneidad del PSII, en cuatro cultivares de poroto: Arroz Tuscola...
Tipo: Journal article
Palavras-chave: PSIIß; Estados de transición; Phaseolus vulgaris; Fluorescencia de la clorofila; Fotosíntesis; Estrés hídrico; Temperatura.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400006

EFECTO DE LA TEMPERATURA EN LA LONGEVIDAD, REPRODUCCIÓN, Y DESARROLLO DE Trichogramma nerudai Y Trichogramma dendrolimi (HYMENOPTERA: TRICHOGRAMMATIDAE)
Provedor de dados: 113
Autores: Zúñiga H.,Karinne; Gerding P.,Marcos.
Trichogramma nerudai Pintureau y Gerding, fue recientemente descrito en Chile y existe poca información acerca de la influencia de medio ambiente en su comportamiento. Por esta razón se realizó un estudio comparando a esta especie con T. dendrolimi, evaluando la longevidad, reproducción y estados de desarrollo a 15, 20, 25 y 30ºC. La longevidad y tiempo de desarrollo disminuyó en ambas especies a medida que la temperatura aumentó, siendo más afectadas las hembras de T. nerudai. La duración del ciclo de vida fue más largo en T. nerudai que en T. dendrolimi, independiente de la temperatura. El máximo parasitismo de huevos de Sitotroga cerealella lo realizó T. nerudai a 20 y 25ºC. Cada hembra de T. nerudai parasitó un total de 74,4 huevos, en promedio,...
Tipo: Journal article
Palavras-chave: Control biológico; Parasitoide de huevo; Parasitismo.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000300011

Efecto de la Temperatura en la Supervivencia Embrionaria y Primeros Estadios Larvales de Psetta maxima
Provedor de dados: 77
Autores: Pepe-Victoriano,Renzo; Araya,Miguel; Faúndez,Víctor.
La tasa de mortalidad en las etapas embrionarias y larvales de los peces marinos se asocia al éxito de un cultivo y es necesario optimizar los procedimientos de este a nivel de desarrollo embrionario y primeros estadios larvales para una óptima supervivencia larval y una mejor producción de juveniles. Para evaluar el efecto de la temperatura en la supervivencia embrionaria y larvaria del turbot, los huevos fecundados de dos reproductores se trasladaron a estanques cónicos de incubación a tres diferentes temperaturas (12,5; 15,5 y 18,5C). Los huevos que se encontraban a temperaturas extremas (12,5 y 18,5C) tuvieron un menor desarrollo embriológico, con un porcentaje de mortalidad diaria significativamente mayor en los tres primeros días y al término de la...
Tipo: Journal article
Palavras-chave: Huevos de peces; Turbot; Larvas de peces.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400046

EFECTO DE LA TEMPERATURA Y LA SUPLEMENTACIÓN ENERGÉTICA SOBRE LA PRODUCCIÓN DE LECHE EN VACAS LECHERAS A PASTOREO
Provedor de dados: 113
Autores: Jahn,Ernesto; Arredondo,Susana; Bonilla,Walter; Del Pozo,Alejandro.
Se realizó un ensayo con el objeto de determinar el efecto de la suplementación a la sombra durante los meses de verano para vacas que pastorean una pradera de trébol blanco - ballica perenne (Trifolium repens L. -Lolium multiflorum L.). Se compararon 4 tratamientos: I. Pastoreo día y noche sin suplementación; II. Pastoreo día y noche más suplementación; III. Pastoreo día y noche más suplementación a la sombra entre 11:30 y 17:00 h; y IV. Pastoreo día y noche más suplementación al sol entre 11:30 y 17:00 h. Se utilizaron 32 vacas Holstein con una producción promedio inicial de leche de 20,5 L d-1, las que fueron distribuidas en un diseño de bloques. Los resultados mostraron que no hubo un efecto significativo (P ³ 0,05) de los tratamientos sobre la...
Tipo: Journal article
Palavras-chave: Producción láctea; Estrés de calor; Temperatura rectal.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000200007

Efecto de la Terapia láser de Baja Potencia sobre el Hueso Alveolar Dañado
Provedor de dados: 77
Autores: Landaeta Bendezú,María José; Suazo Galdames,Iván Claudio; Cantín López,Mario; Roa Henriquez,Ignacio Javier; Zavando Matamata,Daniela Alejandra.
La terapia con láser de baj a potencia ha demostrado tener propiedades analgésicas antiinflamatorias, bioestimulantes y promotoras de la respuesta tisular al daño. El propósito de este estudio fue determinar el efecto que el láser de baja potencia tiene sobre el hueso alveolar dañado. Se utilizaros 13 ratas Sprage Dawley, en las cuales se realizó una lesión estandarizada del hueso alveolar, posterior a lo cual una muestra aleatoria de 7 ratas fue sometida a un protocolo de irradiación de 6 J/cm2, tres veces por semana durante cuatro semanas. Las muestras obtenidas del sitio lesionado en ratas expuestas y no expuestas a la terapia fueron procesadas para hematoxilina eosina, contabilizándose el número de osteonas al microscopio óptico con aumento de 40x. Los...
Tipo: Journal article
Palavras-chave: Láserterapia de baja potencia; Láser bioestimulación; Hueso alveolar.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300021

Efecto de la Variedad en el Desarrollo de Embriones in vitro de Vides Estenospermocárpicas
Provedor de dados: 113
Autores: Hewstone O,Nicole; Valenzuela B,Jorge; Muñoz Sch,Carlos.
El propósito del mejoramiento genético de uva de mesa (Vitis vinifera L.) en el Instituto de Investigaciones Agropecuarias (INIA), Centro Regional de Investigación La Platina, es la obtención de nuevas variedades de alta calidad, alto rendimiento, buen calibre y larga vida de postcosecha. En uvas estenospermocárpicas ocurre el aborto prematuro de las semillas en desarrollo. Sin embargo, mediante el cultivo de semillas inmaduras y rescate de embriones es posible utilizar variedades apirenas como madres. El objetivo de este trabajo fue analizar el efecto de la variedad utilizada ya sea como polinizante o madre, en los cruzamientos sobre el rendimiento de plantas por óvulo. Se analizaron los resultados de cruzamientos de cinco temporadas, de siete variedades...
Tipo: Journal article
Palavras-chave: Uva de mesa; Rescate de embriones; Apirenia.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000200002

EFECTO DE LA VEGETACIÓN Y TAMAÑO DE LOS AGREGADOS SOBRE FORMAS ORGÁNICAS DEL SUELO
Provedor de dados: 113
Autores: Vázquez,Mabel E.; Pellegrini,Andrea E.; Diosma,Gabriela.
Las especies vegetales establecen dinámicas particulares de la materia orgánica del suelo y condicionan su actividad microbiológica, especialmente por las cantidades y naturaleza de los residuos aportados. En este trabajo se evaluó la incidencia de especies arbóreas y herbáceas en la biomasa microbiana, el contenido de carbono y nitrógeno totales (Ct, Nt) y livianos (Cl, Nl) sobre fracciones de diferentes tamaños en un Argiudol típico de la Argentina. Los resultados obtenidos permiten hacer las siguientes afirmaciones: las concentraciones de Ct, Cl y Nt fueron considerablemente superiores en las fracciones mayores a 0,1 mm; la concentración de Ct, Cl, Nt y Nl, ponderada por el peso de la fracción, fue considerablemente superior para la fracción comprendida...
Tipo: Journal article
Palavras-chave: Nitrógeno; Carbono; Biomasa microbiana.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100007

Efecto de la Vitrificación de Ovocitos Humanos sobre la Capacidad de Unión y el Estado Acrosomal de Espermatozoides Humanos
Provedor de dados: 77
Autores: Vilella,Ismael; García,Eva M; Ten,Jorge; Bernabeu,Rafael; Segovia Huerta,Yolanda; Gómez-Torres,María José.
Conocer los aspectos moleculares que acontecen en el proceso de unión de los espermatozoides humanos a la zona pelúcida (ZP) humana es uno de los grandes retos de la biología de la Reproducción. Por otra parte conocer si el proceso de fecundación puede verse afectado por la criopreservación de los gametos femeninos sigue siendo otra cuestión debatida en la literatura. En base a esto, el objetivo principal de este trabajo fue conocer si la vitrificación ovocitaria puede alterar la interacción de los espermatozoides con el glicocáliz de la ZP y demostrar si la ZP de estos ovocitos pierde la capacidad de inducir la reacción acrosómica en los espermatozoides. Según nuestros resultados el método de vitrificación ovocitaria cerrado (S3) no altera la capacidad de...
Tipo: Journal article
Palavras-chave: Test Hemizona; Ovocitos Humanos; Reacción Acrosómica; Vitrificación y Espermatozoides Humanos.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300005

EFECTO DE LAS TÉCNICAS DE LAVADO Y FERTILIZACIÓN SOBRE LA SALINIDAD EN SUELOS DEL ALTO VALLE DE RÍO NEGRO Y NEUQUÉN, ARGENTINA
Provedor de dados: 113
Autores: Gili S.,Perla; Marando I.,Graciela; Irisarri E.,Jorge; Sagardoy R.,Marcelo.
El objetivo de este trabajo fue evaluar el efecto de la rehabilitación de suelos por lavado, la aplicación de fertilizante nitrogenado y la inoculación con Sinorhizobium meliloti, para atenuar el estrés salino existente en plantas de alfalfa (Medicago sativa L.), sembradas en cinco suelos afectados por sales, pertenecientes al Alto Valle de Río Negro y Neuquén, Argentina. La respuesta de las plantas a las condiciones de salinidad, no sólo depende de la concentración de sales sino también del tipo de sales presentes en el suelo. El tipo de salinidad sódica es la más perjudicial. En los Torrifluventes Típicos (Centenario) con alto contenido de sales de NaCl y bajo tenor de materia orgánica, las semillas de alfalfa no germinaron. El lavado de estos suelos...
Tipo: Journal article
Palavras-chave: Salinidad; Fertilización; Medicago sativa; Sinorhizobium meliloti.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000300010

EFECTO DE LOS RESIDUOS VEGETALES PROVENIENTESDE DOS TRATAMIENTOS SILVÍCOLAS EN UNAPLANTACIÓN DE Pinus radiata D. DON SOBRE LOSCAMBIOS ESTACIONALES DE LAS ACTIVIDADESBIOLÓGICAS DEL SUELO
Provedor de dados: 127
Autores: Alvear,Marysol; Astorga,Marcia; Reyes,Francisco.
El impacto de los residuos vegetales provenientes de manejos silvícolas sobre la dinámica de nutrientes en suelos forestales es aún desconocida. Es necesario determinar el efecto de los residuos provenientes de la poda y el raleo dejados sobre la superficie del suelo, ya que tienen un impacto directo sobre las propiedades físico-químicas y en las actividades microbianas del suelo. El objetivo de este estudio fue cuantificar y comparar el efecto de residuos vegetales provenientes de dos tratamientos silvícolas (poda y raleo) sobre algunas actividades biológicas medidas después de 10 años de manejo en invierno y en primavera. Este fue realizado en un Ultisol plantado con Pinus radiata D. Don. Nosotros determinamos: la hidrólisis de la fluoresceína diacetato...
Tipo: Journal article
Palavras-chave: Manejos silvícolas; Biomasa microbiana; Actividades enzimáticas; Pinus radiata.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000100002

EFECTO DE MÉTODOS DE RIEGO LOCALIZADO EN LA SALINIDAD DEL PERFIL DE SUELO EN VID DE MESA.: CONDUCTIVIDAD ELÉCTRICA, SODIO, CLORO Y BORO EN DISTINTOS PUNTOS DEL PERFIL
Provedor de dados: 113
Autores: Osorio U.,Alfonso; Césped R.,Ricardo.
En un parronal de vid de mesa cv. Thompson Seedless, establecido en suelos aluviales salinos (Aridisoles Paleorthids) del valle de Copiapó, en el norte de Chile, se midió la salinidad del suelo, el contenido de sodio, cloruro y boro, todos en el extracto de saturación. Las muestras se obtuvieron a distintas profundidades, en distintos cortes espaciales en relación a la línea de goteo y a la hilera de plantación, considerando tres tratamientos de riego: línea de goteo con lateral simple, con goteros de 4 L h-1, espaciados a metro (testigo) ; línea de goteo con lateral doble, con goteros de 2 L h-1, espaciados a metro; y línea lateral simple utilizando un microjet de 14 L h-1 por planta. Los resultados obtenidos indican que la salinidad del suelo disminuye...
Tipo: Journal article
Palavras-chave: Riego; Salinidad del suelo.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000200008

Efecto de sustratos con compost y fertilización nitrogenada sobre la fotosíntesis, precocidad y rendimiento de pimiento (Capsicum annuurn)
Provedor de dados: 118
Autores: De Grazia,Javier; Tittonell,Pablo A; Chiesa,Ángel.
Los plantines presentan elevada demanda de nutrientes como resultado de su alta tasa de crecimiento en relación a las plantas adultas. Para evaluar la adición de nitrógeno a sustratos preparados con y sin materiales compostados en la producción de pimiento, se realizó un ensayo fertilizando plantines cultivados en diferentes sustratos: Testigo (60% turba de Sphagnum + 40% perlita), Mezclal (45% turba de Sphagnum + 30% perlita + 25% material vegetal compostado), Mezcla II (30% turba de Sphagnum + 20% perlita + 50% material vegetal compostado) y un sustrato Comercial (turba de Sphagnum + 40% compost + perlita + vermiculita) con 150 y 300 mg-L-1 de nitrógeno por semana, manteniendo un testigo sin fertilizar. Los plantines fueron transplantados en invernadero...
Tipo: Journal article
Palavras-chave: Areafoliar; Capsicum annuum; Compost; Medio de crecimiento; Nitrógeno; Rendimiento precoz; Transplante.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000300003

Efecto de Sustratos Foliares Sobre la Sigatoka Negra (Mycosphaerella fijiensis Morelet) en Banano (Musa × paradisiacaL.) y Plátano (Musa acuminata Colla)
Provedor de dados: 113
Autores: Patiño H,Luis Fernando; Bustamante R,Elkin; Salazar P,Lina María.
La Sigatoka Negra, causada por el hongo Mycosphaerella fijiensis Morelet, es la enfermedad foliar más destructora para la producción de los cultivos de banano (Musa × paradisiaca L.) y plátano (Musa acuminata Colla) en el mundo. Actualmente el control de esta enfermedad se centra en la aplicación de fungicidas químicos, a los cuales el patógeno ha desarrollado resistencia, aumentando los costos de control, el impacto negativo sobre el ambiente y la exigencia de los consumidores por una fruta cada vez más libre del uso de plaguicidas. Se ha desarrollado investigación para promover el incremento de poblaciones nativas de bacterias con actividad lítica sobre M. fijiensis a través de sustratos foliares selectivos de esta microbiota. La aplicación de sustratos...
Tipo: Journal article
Palavras-chave: Bacterias quitinolíticas; Bacterias glucanolíticas; Quitina coloidal; Harina de cebada; Control biológico.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400012

EFECTO DE TRES SISTEMAS DE LABRANZA SOBRE EL NIVEL DE HUMEDAD EN EL PERFIL DEL SUELO
Provedor de dados: 113
Autores: Uribe C.,Hamil; Rouanet M.,Juan L.
Los sistemas de labranza conservacionista tienen ventajas sobre los convencionales, puesto que permiten proteger los recursos naturales. Sin embargo, es importante demostrar estas ventajas para fomentar la adopción de este tipo de tecnologías por los agricultores. El objetivo de este estudio fue determinar si el tipo de labranza afecta el contenido de humedad en el perfil del suelo. Para ello se comparó el efecto de tres sistemas de labranza sobre la disponibilidad de agua en un suelo Ultisol. Los tratamientos fueron: cero labranza con quema (CL+Q); cero labranza sin quema (CL-Q); y labranza tradicional (TRAD). Los resultados mostraron que entre término de macolla-inicio de encañado y espigadura se obtuvo un índice de humedad promedio de 1,023 en CL-Q, que...
Tipo: Journal article
Palavras-chave: Sistemas de labranza; Sostenibilidad; Cero labranza.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000400007

EFECTO DE TRES SISTEMAS DE MANEJO DE SUELO EN LA EFICIENCIA FISIOLÓGICA DE USO DE NITRÓGENO FERTILIZANTE EN TRIGO
Provedor de dados: 113
Autores: Rouanet M.,Juan Luis; Pino,Inés; Parada,Ana María; Nario,Adriana.
El desarrollo de nuevos sistemas de manejo de suelo conservacionista está destinado a la protección del recurso suelo. Dado que la fertilización nitrogenada es el recurso de producción de más alto costo en los sistemas de producción de trigo en suelos Ultisoles, uno de los más erosionados en el sur de Chile, se requieren métodos que evalúen la eficiencia de uso de N y su potencial de incremento en estos sistemas. Se evaluó la eficiencia fisiológica o la eficiencia de utilización de N-fertilizante en trigo (Triticum aestivum L.) cv. Dalcahue, bajo tres sistemas de manejo de suelo: tradicional, quema de rastrojos e inversión del suelo (TRAD); cero labranza con quema (CL+Q); y cero labranza sin quema (CL-Q). El uso de la técnica isotópica (15N) permitió un...
Tipo: Journal article
Palavras-chave: Manejo de suelos; Sustentabilidad; 15N; Técnicas isotópicas; Trigo; Fertilización.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000400008

Efecto de un Programa de Estiramientos de la Musculatura Isquiosural en Futbolistas
Provedor de dados: 77
Autores: Vaquero-Cristóbal,Raquel; Muyor,José María; Alacid,Fernando; López-Miñarro,Pedro A.
El objetivo fue determinar la influencia de un programa de estiramientos de la musculatura isquiosural en la extensibilidad de jugadores de fútbol. Un total de 17 futbolistas de 3 división (media de edad: 25,12 ± 4,16 años) y 19 sujetos sedentarios (media de edad: 24,26 ± 5,64 años) (grupo control) participaron voluntariamente en el estudio. El grupo de futbolistas realizó, durante un periodo de 16 semanas, un plan específico de estiramientos de la musculatura isquiosural, que fue incluido dentro de su plan de entrenamiento, realizando dos series de cuatro estiramientos en las cuatro sesiones semanales de entrenamiento. El grupo control estuvo compuesto por adultos jóvenes varones que no realizaban actividad física alguna. A todos ellos se les valoró la...
Tipo: Journal article
Palavras-chave: Extensibilidad isquiosural; Programa de intervención; Deporte; Flexibilidad.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300049

Efecto del ácido indolbutírico, del tipo de la cama de arraigamiento, del substrato, y del árbol madre en la capacidad de arraigamiento de estacas de Nothofagus glauca (Phil.) Krasser
Provedor de dados: 97
Autores: SANTELICES,RÓMULO; CABELLO,ÁNGEL.
Nothofagus glauca (Phil.) Krasser es una especie característica de la zona mesomórfica de Chile que tiene problemas de conservación y de la cual existe insuficiente información sobre técnicas de propagación vegetativa; por ello se estudiaron algunos aspectos relacionados con el arraigamiento de estacas. A partir de material cosechado en noviembre de 1995 y de 1997, se evaluó el efecto del ácido indolbutírico (AIB) (0; 0,5; 1; 2 %); del tipo de cama de arraigamiento (caliente y fría); del substrato empleado (aserrín y corteza de Pinus radiata D. Don); y del árbol madre. Los ensayos, de 2,5 a 4 meses de duración se realizaron en un invernadero equipado con un sistema de riego automatizado y con cama caliente que mantuvo una temperatura entre 21 y 25 °C en la...
Tipo: Journal article
Palavras-chave: Nothofagus glauca; Estacas; Ácido indolbutírico; Substrato; Árbol madre.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000100005

EFECTO DEL AGUA Y FERTIRRIGACION EN EL DESARROLLO Y PRODUCCIÓN DE NARANJOS CV. THOMPSON NAVEL
Provedor de dados: 113
Autores: Holzapfel,Eduardo A.; Lopez,Claudio; Joublan,Jean P.; Matta,Ricardo.
En la temporada 1994/1995 se realizó un estudio con el objetivo de determinar el efecto de las aplicaciones de diferentes niveles de agua y fertirrigación asociados a través del riego por goteo, sobre parámetros biofísicos, productivos y de calidad de naranjos (Citrus sinensis L.) cv. Thompson Navel de 16 años. El ensayo se llevó a cabo en el Predio de la Sociedad Agrícola La Rosa-Sofruco S.A., situada en la comuna de Peumo, Chile (34° 19’ lat. Sur, 71° 15’ long. Oeste) a una altitud de 215 m.s.n.m. Los resultados obtenidos indican que la aplicación creciente y simultánea de agua y fertirrigación produce un aumento en la producción y calidad de la fruta en naranjos cv. Thompson Navel. En relación con los parámetros biofísicos analizados, tales como...
Tipo: Journal article
Palavras-chave: Riego; Cítricos; Fertirrigación.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100006

Efecto del Aliskireno sobre la Angiogénesis en Modelo de Membrana Alantocoriónica (MAC) de Pollo
Provedor de dados: 77
Autores: de la Fuente E,Raúl; Rosas C,Carlos; Fuenzalida B,Marcela; Rodríguez B,Héctor; Roa,Ignacio; Lemus A,David.
La acción antiangiogénica de los inhibidores del receptor de angiotensina II (ARA II), ha sido documentada previamente, sin embargo, no ha sido descrita la relación entre angiogénesis e inhibidores directos de la renina (DRIs), los cuales participan regulando el sistema renina-angiotensina-aldosterona (SRAA). El objetivo fue demostrar el efecto antiangiogénico de aliskireno, un DRI, en membranas alantocoriónicas (MAC) de pollo, para lo cual fueron instilados aliskireno y enalapril sobre MAC en distintas concentraciones para realizar su comparación posterior. En secciones histológicas seriadas se registró el número de vasos sanguíneos presentes en 9000 µm2 bajo microscopio de luz a máximo aumento, y se realizó análisis estadístico utilizando ANOVA y el test...
Tipo: Journal article
Palavras-chave: Angiogénesis; Membrana alantocoriónica; Aliskireno; Enalapril.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400002

EFECTO DEL ARREGLO DE RACIMO Y APLICACIÓN DE CITOQUININA SINTÉTICA (CPPU) EN LA CALIDAD DE UVA DE MESA VARIEDAD SULTANINA TRATADA CON DOS FUENTES DE GIBERELINAS
Provedor de dados: 113
Autores: Navarro O.,Mauricio; Retamales A,Julio; Defilippi B.,Bruno.
Se realizaron dos ensayos con dos fuentes de giberelinas (GA3 y GAs) para evaluar efectos de manejo de racimo y adición de N-(2-cloro-4-piridil)-N'-fenilurea (CPPU), una citocinina sintética, sobre la producción y calidad de la uva Sultanina. En cada ensayo se consideraron los factores de adicionar o no CPPU (5 mg L-1) y realizar o no raleo adicional (30% de eliminación) originándose cuatro tratamientos de la combinación de factores. La adición de CPPU al GA3 provocó un aumento en el tamaño de las bayas (20%), peso de racimos (20%) y producción total por planta (22%), con un retraso en la maduración de la fruta. CPPU determinó bayas de color más verde, mayor grosor del pedicelo y mejor apariencia del escobajo. El raleo adicional provocó un adelanto en...
Tipo: Journal article
Palavras-chave: Thompson Seedless; Raleo de bayas; Ácido giberélico; Giberelinas; Citoquininas; CPPU (N-[2-cloro-4-piridil]-N’-fenilurea).
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100002

Efecto del aumento de la temperatura en la fotosíntesis de una especie alto-andina en dos altitudes
Provedor de dados: 73
Autores: Sanfuentes,Camila; Sierra-Almeida,Angela; Cavieres,Lohengrin A.
Se ha propuesto que los ambientes de alta montaña son especialmente vulnerables al calentamiento global. La interacción de variables como déficit hídrico y las condiciones de temperatura ambiental puede restringir el intercambio gaseoso en zonas de alta-montaña. Debido a las distintas limitaciones abióticas que se encuentran en un gradiente altitudinal, se propone que el aumento de la temperatura afectará positivamente la fotosíntesis de la planta alto-andina Phacelia secunda en elevadas altitudes y negativamente a las plantas de bajas altitudes. En el presente estudio se evaluó el efecto del aumento de la temperatura ambiental sobre el intercambio gaseoso de P. secunda en dos altitudes: 2900 m y 3600 m. En cada altitud se expusieron seis individuos de P....
Tipo: Journal article
Palavras-chave: Phacelia secunda; Calentamiento global; Estrés por temperatura; Sequía; Conductancia estomática.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100005

Efecto del Aumento de la Temperatura, Frecuencia de Alimentación y Ración de Alimento en el Crecimiento de Juveniles de Turbot Psetta maxima
Provedor de dados: 77
Autores: Pepe-Victoriano,Renzo; Silva,Alfonso; Vega,Alonso; Araya,Miguel; Cornejo,Lorena.
Se determina la influencia del aumento de la temperatura (17 a 20°C), la ración (2,5% a 3,5% del peso día) y la frecuencia de alimentación (4 a 6 veces día), en el crecimiento y la supervivencia de juveniles de turbot (Psetta maxima) en un sistema productivo comercial durante 35 días. Los resultados muestran que el crecimiento de los juveniles provenientes del nuevo protocolo de cultivo experimental ensayado es mayor y muestra una tasa específica de crecimiento, significativamente diferente respecto a los cultivados con el protocolo base, sin afectar la supervivencia, la que se mantiene en 99,8%. Se sugiere realizar mayores estudios para aislar o definir exactamente el efecto sinérgico de las variables definidas, así como complementar los resultados...
Tipo: Journal article
Palavras-chave: Producción de peces; Protocolo de cultivo; Supervivencia.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300023

EFECTO DEL CAMBIO DE USO EN LA ESTABILIDAD DE LA ESTRUCTURA Y LA FUNCIÓN DE LOS POROS DE UN ANDISOL (TYPIC HAPLUDAND) DEL SUR DE CHILE
Provedor de dados: 127
Autores: Dörner,José; Dec,Dorota; Peng,Xinhua; Horn,Rainer.
Los suelos volcánicos del sur de Chile constituyen cerca del 60% del suelo arable del país. Estos suelos se encuentran bajo un amplio rango de usos desde sistemas prístinos hasta otros con un uso intensivo. El objetivo de este trabajo fue determinar el efecto del cambio de uso de suelo sobre: i) la estabilidad del suelo frente a presiones externas e internas; ii) la conductividad hidráulica y iii) su resiliencia funcional. Muestras disturbadas y no disturbadas de suelo fueron recolectadas a 5, 20, 40 cm de profundidad en un suelo Andisol (Typic Hapludand) bajo un renoval de bosque nativo (NF), una pradera de 50 años (P50) y otra de 1 año de uso (Pl). Se determinó la curva de retención de agua, contracción y consolidación, la conductividad hidráulica...
Tipo: Journal article
Palavras-chave: Andisol; Propiedades estructurales; Función de los poros.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000300003

Efecto del Clima, de las Características de la Hoja y de la Metodología de Medición en el Potencial Hídrico Xilemático en Palto (Persea americana Mill.)
Provedor de dados: 113
Autores: Ferreyra E,Raúl; Selles V,Gabriel; Maldonado B,Patricio; Celedón de A,José; Gil M,Pilar.
Se realizó una investigación durante la temporada 2003/2004 en un huerto de paltos (Persea americana Mill.) cv. Hass, sobre portainjerto Mexicola, con el objeto de mejorar la metodología de medición del potencial hídrico xilemático medido a medio día (&amp;#936;xm), utilizando la técnica de la cámara de presión.. El huerto estaba localizado en a V Región (32°53’lat. Sur; 71°16’ long. Oeste). Los árboles se encontraban en etapa productiva y sin restricciones hídricas ni nutricionales. Se realizaron varios experimentos con el objetivo de optimizar y simplificar las mediciones del potencial hídrico xilemático a mediodía (&amp;#936;xmin): efecto del déficit de presión de vapor del aire (DVP), de la edad de la hoja, del tiempo de equilibrio al cubrir la hoja,...
Tipo: Journal article
Palavras-chave: Potencial hídrico xilemático; Aguacate; Estado hídrico de la planta.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000200008

Efecto del coadyuvante siliconado e insecticidas en el control del chanchito blanco de la vid, Pseudococcus viburni (Hemiptera: Pseudococcidae)
Provedor de dados: 118
Autores: Sazo,Luis; Araya,Jaime E; de la Cerda,José.
Se estudió durante la temporada 2005-2006 el efecto del coadyuvante siliconado trisiloxano en combinación con poliéter (Break) en concentraciones de 50, 75 y 100 mLhL' junto con insecticidas en el control de chanchito blanco de la vid (Pseudococcus viburni) en dos viñedos comerciales de la Región Metropolitana de Chile, infestados naturalmente la temporada precedente, como parte de un programa normal de control, con clorpirifos en post-cosecha y previo al cierre del racimo (verano), y diazinon en brote de 10-15 cm en primavera. Se incluyó un tratamiento estándar de diazinon sin surfactante y un testigo sin aplicación. En cosecha, se determinaron los racimos sanos y con diversos grados de infestación, sobre 100 racimos por unidad experimental. Los...
Tipo: Journal article
Palavras-chave: Break; Chanchito blanco de la vid; Chlorpirifos; Coadyuvante; Diazinon surfactante; Vitis vinifera.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200012

Efecto del Color de Trampa en la Captura de Frankliniella occidentalis (Thysanoptera: thripidae) en Pimiento (Capsicum annuum L.)
Provedor de dados: 113
Autores: Larraín S,Patricia; Varela U,Francisco; Quiroz E,Carlos; Graña S,Fernando.
Se realizaron experimentos para determinar la preferencia de color de trips (Frankliniella occidentalis Pergande) en cultivos de pimiento (Capsicum annum L.), en las localidades de Cerrillos de Tamaya (30° lat. S.; 71°16’ long. O) y Pan de Azúcar (29°55’ lat. S; 71°14’ long, O) de la IV Región de Chile. En diseño de bloques completos al azar, se compararon trampas de pegamento azul, blanco, blanco-azul y amarillo.Los resultados mostraron que F. occidentalis fue la especie predominante en el cultivo de pimiento. En la trampa de color azul, blanco-azul y blanco se capturaron significativamente más trips que en las trampas amarillas, cuando las capturas fueron superiores a 300 trips semanales por trampa. Los resultados fueron erráticos con capturas inferiores.
Tipo: Journal article
Palavras-chave: Thrips; Preferencia de color; Trampas pegajosas; Pimiento.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000300009

EFECTO DEL CONTENIDO DE AGUA EN LA MINERALIZACIÓN BRUTA E INMOVILIZACIÓN DE NITROGENO
Provedor de dados: 113
Autores: Videla,Ximena; Parada,Ana María; Nario,Adriana; Pino,Inés; Hood,Rebecca.
La descomposición de la materia orgánica en el suelo, asociada a la dinámica de mineralización e inmovilización del N, son procesos claves en el sistema suelo-planta. Hipotéticamente el régimen de humedad tiene una influencia significativa sobre estos procesos. Para estudiar el efecto del contenido de humedad sobre la mineralización e inmovilización del N, se realizaron dos ensayos de laboratorio en un suelo Ultisol, que se incubó a 25ºC y con dos regímenes de humedad, a capacidad de campo (CC) (40% p/p) y a 85% de CC (34% p/p). Usando la técnica de dilución isotópica 15N y procedimientos de imagen de espejo, se determinó la tasa bruta de mineralización y nitrificación, tanto como la inmovilización del N. Las tasas de mineralización y nitrificación bruta...
Tipo: Journal article
Palavras-chave: Mineralización de N; Imagen de espejo; 15N.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100008

EFECTO DEL ESTRÉS HÍDRICO APLICADO EN DISTINTOS PERIODOS DE DESARROLLO DE LA VID cv. CHARDONNAY EN LA PRODUCCIÓN Y CALIDAD DEL VINO
Provedor de dados: 113
Autores: Ferreyra E.,Raúl; Sellés V.,Gabriel; Ruiz S.,Rafael; Sellés M.,Iván.
Durante las temporadas 1998/99, 1999/2000 y 2000/01 se realizó una investigación en vides (Vitis vinifera L.) cv. Chardonnay, con el objeto de evaluar los efectos de la restricción hídrica sobre la producción, calidad del vino, estado hídrico de las plantas y las reservas nutricionales de las raíces. Los tratamientos aplicados fueron los siguientes: T1 y T2, aplicación de agua equivalente al 100 y 40%, respectivamente, de la evapotranspiración del cultivo (ETc) durante toda la temporada; T3, sin aplicación de agua desde brotación a pinta y reposición del 100% de ETc de pinta hasta la cosecha; T4, aplicación de agua equivalente al 100% de ETc entre brotación y pinta, y suspensión del riego desde pinta hasta la cosecha. La disminución del aporte hídrico...
Tipo: Journal article
Palavras-chave: Eficiencia del uso de agua; Vitis vinifera; Riego deficitario controlado.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000300007

EFECTO DEL ESTRÉS HÍDRICO DURANTE LA FASE II DE CRECIMIENTO DEL FRUTO DEL DURAZNERO cv. KAKAMAS EN EL RENDIMIENTO Y ESTADO HÍDRICO DE LAS PLANTAS
Provedor de dados: 113
Autores: Ferreyra E.,Raúl; Selles V.,Gabriel; Lemus S.,Gamalier.
El agua es un recurso escaso en la zona central de Chile, donde se encuentra la mayor superficie plantada de durazno (Prunus persica L. Bastsch), por lo cual es necesario disponer de información que permita usar el agua eficientemente. En los últimos años, utilizando las características de crecimiento del fruto del durazno, ha sido posible disminuir el consumo de agua en la Fase II sin afectar significativamente la producción y calidad de la fruta. El ensayo fue ejecutado entre 1994 y 1996 en 90 plantas de un huerto de alta densidad de durazno cv. Kakamas, plantado en agosto de 1991, con una densidad de 1250 plantas por hectárea, en el Centro Experimental La Platina (33°34’ lat. Sur; 70°38’ long. Oeste). Los resultados mostraron que se puede disminuir el...
Tipo: Journal article
Palavras-chave: Relaciones hídricas; Déficit hídrico; Déficit hídrico controlado.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000400008

Efecto del genotipo y fuente de citoquinina en la etapa de iniciación de cultivo in vitro de tejido adulto de Castanea sativa Mill.
Provedor de dados: 73
Autores: Larson A.,Carmen Gloria; Hasbún Z.,Rodrigo; Jofré V.,María Paz; Sánchez-Olate,Manuel; Ríos L.,Darcy.
RESUMEN Castanea sativa Mill. es una especie de interés agroforestal ampliamente cultivada en Europa, cuya producción actual está principalmente enfocada en la obtención de fruto calidad marrón, apetecido en la industria gourmet. En Chile, esta especie puede ser cultivada exitosamente debido al clima y a la ausencia de enfermedades que la afecten. Sin embargo, no existe un sistema de propagación que permita la masificación de plantas para el establecimiento de huertos frutales. Ante esto, la micropropagación se presenta como una alternativa posible de aplicar, ya que es un método muy estudiado en esta especie. La propagación in vitro de Castanea sativa ha generado resultados exitosos en cuanto su introducción y multiplicación, sin embargo la propagación in...
Tipo: Journal article
Palavras-chave: Cultivo in vitro; Variedad; 6-bencilaminopurina; Thidiazuron.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100030

Efecto del Láser de Baja Energía sobre la Expresión de GAP-43 (Growth Associated Protein 43) en Nervio Isquiático Lesionado de Rata
Provedor de dados: 77
Autores: Matamala,Fernando; Paredes,Marco; Cornejo,Ricardo.
El láser infrarrojo se ha utilizado con fines terapéuticos en artritis reumatoide, dolor músculo-esquelético, enfermedades dentales y óseas. A nivel de lesiones nerviosas, se ha utilizado como coadyuvante en tratamientos conservadores y quirúrgicos; sin embargo, no está claro aún cual es su participación en los mecanismos moleculares asociados al proceso regenerativo. Varios genes y sus productos de expresión relacionados conregeneración axonal, están siendo investigados, entre éstos, la proteína GAP-43 (growth associated protein 43) ha sido detectada en diferentes tipos de lesiones de nervios periféricos, donde su expresión aumenta notablemente durante el proceso de recuperación. Con el propósito de evaluar la expresión del transcrito de GAP-43 en nervio...
Tipo: Journal article
Palavras-chave: Láser de baja energía; Nervio isquiático; GAP-43.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300024

Efecto del Láser Infrarrojo sobre Células Tiroideas
Provedor de dados: 77
Autores: Cornejo,Ricardo; Jaramillo,Roberto; Garrido,Orlando; Vergara,Luis.
Diez ratas Sprague Dawley de 4 meses de vida y peso aproximado de 250 g fueron divididas en dos grupos de 5 animales cada uno, el grupo A se mantuvo como control y los animales del grupo B recibieron estimulaciones con láser infrarrojo en la tiroides con dosis de 16 J/cm2 durante 15 días consecutivos. Posteriormente las ratas fueron sacrificadas, se extrajeron las respectivas tiroides siendo procesadas para microscopía óptica y se obtuvieron placas histológicas y micrografías de tiroides con aumentos finales de hasta 1000X, las cuales fueron sometidas a estudios morfométricos para determinar en 100 células foliculares: número, áreas y perímetro tanto celular como nuclear, además de disposición coloidal y presencia de vasos sanguíneos. El análisis de los...
Tipo: Journal article
Palavras-chave: Células tiroides; Células foliculares; Morfometría; Láser infrarrojo.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200015

EFECTO DEL METODO Y EDAD DE LAS PLÁNTULAS SOBRE EL PRENDIMIENTO Y DESARROLLO DE INJERTOS EN MELON (Cucumis melo)
Provedor de dados: 113
Autores: Riveros B.,Fernando.
Se condujeron dos experimentos para determinar el efecto de la edad de plántulas y de diferentes técnicas de injertación en melón (Cucumis melo). En el primero se compararon cuatro técnicas de injertación: aproximación, empalme, púa y tubo en dos variedades botánicas: C. melo var. reticulatus and C. melo var. inodorus. La sobrevivencia de plantas fue modificada significativamente por variedad, técnica e interacción (P £ 0,05). En la var. inodorus todas las técnicas determinaron tasas de sobrevivencia significativamente diferentes entre ellas y menores que el testigo. En la var. reticulatus sólo la técnica de púa mostró menor sobrevivencia, mientras que no hubo diferencias significativas entre las técnicas restantes y el testigo. La sobrevivencia fue...
Tipo: Journal article
Palavras-chave: Injertación; Melón; Injerto; Patrón.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000300002

Efecto del parasitismo del isópodo bopírido Ionella agassizi (Isopoda: Epicaridea) (Bornnier, 1900) sobre la fisiología nutricional del nape Neotrypaea uncinata (M. Edwards, 1837) (Decapoda: Thalassinidea)
Provedor de dados: 97
Autores: Astete-Espinoza,Lorena P.; Caceres M,Cristian W.
El nape Neotrypaea uncinata se encuentra parasitado en sus branquias por el isópodo Ionella agassizi. Trabajos anteriores han señalado que I. agassizi provoca un efecto negativo en la biología reproductiva del nape, afectando significativamente tanto el desarrollo de los órganos reproductores como la expresión de las características sexuales secundarias. Lo anterior podría estar asociado a una disminución de las sustancias de reserva de N. uncinata, afectando de esta manera su metabolismo. En este trabajo se determinaron las concentraciones de metabolitos relacionados con el estado nutricional de N. uncinata (proteínas totales, hemocianina, lactato y glucosa); además se evaluó el porcentaje de lípidos en el tejido del hospedador. Los resultados obtenidos...
Tipo: Journal article
Palavras-chave: Parasitismo; Fisiología; Hemolinfa; Nape; Isópodo.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000200003

Efecto del precio internacional sobre el precio de la leche pagado a productor: transitorio o permanente?
Provedor de dados: 113
Autores: Nahuelhual M.,Laura; Engler P.,Alejandra.
En este estudio se aplicó el análisis de cointegración y modelo de vector de corrección por el error (VCE) para analizar la magnitud y duración del impacto del precio de importación de productos lácteos sobre el precio de leche pagado a productor en Chile. Las variables incluidas en el modelo fueron el precio nacional, el precio CIF (Cost, Insurance and Freight) y la tasa de cambio, para el periodo comprendido entre enero de 1990 y diciembre de 2002. Los resultados indicaron que el precio de importación CIF influenció de manera significativa el precio doméstico pagado a productor, lo cual quedó demostrado por la magnitud de los coeficientes del vector de cointegración y los coeficientes de velocidad de ajuste. El análisis de perfiles de persistencia mostró...
Tipo: Journal article
Palavras-chave: Precio leche; Cointegración; Respuesta a impulso; Perfiles de persistencia.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000400007

Efecto del Propóleos Chileno sobre el Metabolismo de Glucosa en Ratones Diabéticos
Provedor de dados: 77
Autores: Pacheco,Alejandro; Daleprane,Julio B; Freitas,Vanessa S; Ferderbar,Simone; Hirabara,Sandro; Cuevas,Alejandro; Saavedra,Nicolás; Curi,Rui; Abdalla,Dulcineia S. P; Salazar,Luis A.
En el presente estudio se evaluó el efecto del propóleos sobre el metabolismo de la glucosa en ratones C57/BL-6 con diabetes mellitus tipo 2 inducida por dieta alta en grasa. Se midieron los cambios en las concentraciones séricas de lípidos, glucosa e insulina, y el efecto sobre la captación de 2-deoxi-[2,6-3H]-D-glucosa, síntesis de [14C]-glicógeno y descarboxilación de [U-14C]-D-glucosa inducida por insulina en músculo aislado. Los resultados muestran que en ratones diabéticos, el tratamiento con propóleos (150 mg/kg/día) reduce los niveles de insulina e índice HOMA (P&lt;0.05). También disminuyó la obesidad abdominal de estos animales (P&lt;0.05). Por otro lado, no modificó las concentraciones plasmáticas de glucosa, colesterol total y triglicéridos. Se...
Tipo: Journal article
Palavras-chave: Propóleos; Ratones Diabéticos; Polifenoles; Glucosa.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300015

EFECTO DEL SISTEMA DE LABOREO EN LAS PÉRDIDAS DE SUELO POR EROSIÓN EN LA ROTACIÓN TRIGO-AVENA Y PRADERAS EN LA PRECORDILLERA ANDINA DE LA REGIÓN CENTRO SUR
Provedor de dados: 113
Autores: Rodríguez S.,Nicasio; Ruz J.,Emilio; Valenzuela P.,Adriana; Belmar N.,Ciro.
Se realizó un estudio durante tres temporadas agrícolas (1994 a 1996) en un suelo de origen volcánico reciente (Dystrandeps) de la precordillera andina en la localidad de San Pedro (Lat. 37° 47’S; Long. 72° 01’0) provincia de Ñuble, área centro sur de Chile, con el objetivo de cuantificar las pérdidas de suelo asociadas al empleo de diferentes tipos de labranza del suelo. Se realizaron cuatro tratamientos de manejo del suelo : labranza convencional (LC), labranza vertical (LV), siembra directa (SD) y pradera natural (P), con tres repeticiones y en un arreglo de bloques completos al azar. Los resultados obtenidos en cada una de las temporadas indican que las mayores pérdidas anuales de suelo están asociadas al empleo de LC con un valor de 20 t ha-1año-1 y...
Tipo: Journal article
Palavras-chave: Erosión de suelo; Sistemas de labranza; Rotación de cultivos.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072000000300006

Efecto del sistema y densidad de la almaciguera en el cultivo de cebolla (Allium cepa)
Provedor de dados: 118
Autores: Gómez,César; Oberpaur,Christel.
Los almacigos de cebolla (Allium cepa) se siembran en suelo o en contenedores (alvéolos) de reducido volumen, en alta densidad, sin considerar el efecto del tamaño del contenedor en el crecimiento del cultivo. Con el propósito de estudiar el efecto del sistema y densidad de la almaciguera se realizaron dos ensayos (almacigo y transplante) en la Región Metropolitana (entre 33,3° y 34° lat. sur), Chile. Se empleó cebolla cv. Grano de Oro, cultivar de día largo destinado para guarda, en la temporada 2004-2005. La siembra de almacigos para transplante a raíz cubierta se estudió en contenedores con 286 (10 cm³), 432 (10 cm³) y 814 (5 cm³) alvéolos, correspondiendo a 1144 (DI), 1728 (D2) y 3256 (D3) plantas/m² y para trasplante a raíz desnuda en cajoneras, con...
Tipo: Journal article
Palavras-chave: Almacigo; Bandeja; Cajonera; Densidad de planta; Transplante.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000300004

Efecto del tamaño de trampas adhesivas amarillas para el muestreo de Frankliniella occidentalis en pimiento (Capsicum annum) en invernadero
Provedor de dados: 118
Autores: Carrizo,Paola.
Las trampas adhesivas cromáticas son comercializadas y recomendadas en diversos colores y tamaños. Si bien ha sido verificada la eficiencia relativa para varios grupos de insectos respecto del color, no se hallaron referencias respecto a su tamaño. El objetivo de este trabajo fue estudiar la relación entre el tamaño de trampa y su eficacia relativa en la captura de Frankliniella occidentalis en pimiento en invernadero. Se utilizaron trampas amarillas de cinco tamaños, entre 100 y 750 cm² en un diseño de bloques completos al azar (DBCA, n=5) y durante 3 campañas consecutivas (13 fechas = 5,4 y 4). Se utilizaron ANOVA, Tukey y Regresión lineal (alfa = 0,05). Se determinó el tamaño adecuado de muestra (número de trampas) para los diversos tamaños y para un...
Tipo: Journal article
Palavras-chave: Pestes; Pimiento; Plagas; Tamaño de trampa; Trampas adhesivas amarillas; Trips.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200008

EFECTO DEL TIEMPO DE INSEMINACIÓN ARTIFICIAL DESPUÉS DE LA DETECCIÓN DE CELO SOBRE LA TASA DE PREÑEZ EN OVINOS CORRIEDALE
Provedor de dados: 113
Autores: Muñoz M.,Camila; Parraguez G.,Víctor H.; Latorre V.,Etel.
Un total de 240 ovejas Corriedale fueron sincronizadas con progesterona y asignadas al azar a 4 grupos, según el tiempo transcurrido entre la detección de celo y la inseminación artificial (IA) con semen de carneros de la misma raza. Los primeros 3 grupos fueron inseminados luego de 3 y 6, 6 y 12; ó 12 y 18 h de detectado el celo; el cuarto grupo recibió una sola inseminación 18 h después de detectado el celo. El semen fue extraído y congelado en una solución de leche descremada, glicerol y yema de huevo, descongelado y usado, registrándose la profundidad de depositación del semen en el cérvix y la cantidad y naturaleza de la mucosa cervical. Treinta días después se determinó la preñez mediante ecografía. No se detectaron diferencias estadísticamente...
Tipo: Journal article
Palavras-chave: Inseminación artificial; Semen congelado; Inseminación intracervical.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000400013

Efecto en la Estructura Histológica del Timo de Ratas Sprague-Dawley Tratadas con Trióxido de Arsénico
Provedor de dados: 77
Autores: Alfaro-Burgos,S; Valenzuela-Estrada,M.
En las áreas costeras del norte de Chile es común encontrar en el agua para consumo humano niveles medios o altos de arsénico. La exposición al arsénico puede ir asociada a efectos agudos o crónicos. El objetivo de esta investigación fue determinar el daño histológico que provoca el trióxido de arsénico a nivel de los compartimentos del timo de ratas Sprague-Dawley. Se utilizaron 24 ratas de ambos sexos de 55 días de vida. Las ratas fueron pesadas y divididas en 3 grupos (4 hembras y 4 machos). A los grupos tratados se les aplicó 5 mg y 10 mg de As2O3 respectivamente, en dosis única diaria vía intraperitoneal por 15 días. Al grupo control se le aplicó agua destilada sin arsénico. Después del tratamiento los animales fueron sacrificados y retirado el timo...
Tipo: Journal article
Palavras-chave: Timo; Trióxido de arsénico; Atrofia; Inmunotoxicidad.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200068

Efecto Morfológico de la Irradiación Láser AsGa en el Músculo Esquelético de Rata
Provedor de dados: 77
Autores: Parra Lara,Roxana; Matamala Vargas,Fernando; Silva Mella,Héctor.
La terapia láser AsGa es ampliamente utilizada en la rehabilitación de lesiones articulares y tendinosas. Por las características físicas del haz de luz utilizado, parte de esta irradiación es absorbida por tejido muscular adyacente, por lo que se planteó medir en un modelo experimental en rata, posibles efectos morfológicos de la irradiación láser AsGa en este tejido. Se realizó un estudio morfométrico y estereológico, utilizando ratas Sprague Dawley sanas, las que fueron irradiadas, por 10 días, en la zona del vientre del músculo gastrocnemio, utilizando tres diferentes dosis 0,8 (Al y A2), 2 (B) y 5 (C) joules/cm². Los miembros contralaterales no fueron irradiados (control). Se determinó el área de la fibra muscular por recuento de puntos (morfometría)...
Tipo: Journal article
Palavras-chave: Músculo esquelético; Láser terapia; Músculo gastrocnemio.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100004

Efecto Mozart en el Aprendizaje Práctico de la Anatomía
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Cantín López,Mario; Salgado Alarcón,Guillermo Enrique; Gajardo Contreras,Carolina Haydée; Caballero Moyano,Paula Macarena; Trujillo Hernández,Erick Gonzalo; Bustos Alvarez,Ivonne Patricia; Zavando Matamata,Daniela Alejandra.
El término efecto Mozart comienza a utilizarse a partir de los trabajos de Rauscher et al. (1993), quienes observaron mejores resultados en tareas que requerían orientación temporo-espacial en estudiantes universitarios. El objetivo de este estudio es analizar el efecto que tiene en el aprendizaje práctico de la anatomía la aplicación de estímulos musicales relacionados con el denominado efecto Mozart. Participaron 254 estudiantes de las carreras de Odontología, Fonoaudiología y Tecnología Médica. Los grupos de estudio fueron sometidos durante toda una Unidad temática a estimulación auditiva utilizando el primer movimiento de la Sonata para dos Pianos en D Mayor (K. 448) de Mozart, los grupos controles desarrollaron su actividad práctica sin estimulación...
Tipo: Journal article
Palavras-chave: Efecto Mozart; Aprendizaje; Aprendizaje práctico; Anatomía.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300033

Efecto nodriza intra-específico de Kageneckia angustifolia D. Don (Rosaceae) sobre la germinación de semillas y sobrevivencia de plántulas en el bosque esclerófilo montano de Chile central
Provedor de dados: 97
Autores: PEÑALOZA,ALEJANDRO; CAVIERES,LOHENGRIN A.; ARROYO,MARY T.K.; TORRES,CRISTIAN.
El bosque esclerófilo montano de Chile central (32-33° S, 1.500-2.100 m de altitud) está dominado por poblaciones de Kageneckia angustifolia (Rosaceae), especie semidecidua de verano que forma un dosel muy abierto. Esto sugiere que, a diferencia de lo que ocurre en el matorral esclerófilo de menor altitud donde el cerrado dosel de árboles y arbustos generan condiciones microclimáticas diferentes a los espacios abiertos, en el bosque montano no existiría una marcada diferencia microclimática entre bajo el dosel y los espacios abiertos. Por otro lado, en el bosque montano, las precipitaciones ocurren principalmente en forma de nieve, la que se acumula preferentemente en los espacios entre los árboles, pudiendo facilitar el reclutamiento de nuevos individuos...
Tipo: Journal article
Palavras-chave: Efecto nodriza; Microclima; Reclutamiento; Bosque montano; Chile central.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300005

Efecto Terapéutico de los Exosomas en el ACV Isquémico en Animales de Experimentación
Provedor de dados: 77
Autores: Carvallo,P; Astudillo,P.
La posibilidad de que los exosomas funcionen como una nueva forma de comunicación intercelular para establecer y mantener circuitos cerebrales está comenzando a ser explorada. Los exosomas son liberados desde células e interactúan con otras células receptoras para mediar cambios fisiológicos. Todas las células cerebrales liberan exosomas incluyendo las celulas madre neuronales, las neuronas, astrocitos, microglia, oligodendrocitos y las celulas endoteliales. El objetivo de esta revisión es reunir evidencia actualizada sobre las funciones de protección, antiinflamación y regeneración de los exosomas en el ataque cerebrovascular (ACV) isquémico en ratas. Se realizó una búsqueda sistemática de la literatura sensible y específica en base de datos Medline,...
Tipo: Journal article
Palavras-chave: Exosomas; Neuroprotección; Isquemia cerebral; Ataque cerebrovascular; Ratas.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400020

Efecto Tóxico del Extracto Acuoso de Ruta graveolens del Norte de México sobre el Hígado de Rata Wistar
Provedor de dados: 77
Autores: Serrano-Gallardo,Luis B; Soto-Domínguez,Adolfo; Ruiz-Flores,Pablo; Nava-Hernández,Martha P; Morán-Martínez,Javier; García-Garza,Rubén; Martínez-Pérez,Edith F.
A Ruta graveolens se le atribuyen propiedades benéficas en medicina tradicional, sin embargo se ha demostrado que también puede producir efectos adversos. A la fecha no existe evidencia que ratifique que R. graveolens es totalmente inofensiva, por este motivo el objetivo de este estudio fue determinar el efecto tóxico del extracto acuoso de las hojas de esta especie vegetal en hígado de rata. Se utilizaron 25 ratas Wistar y se dividieron en 5 grupos (n=5). El grupo 1 correspondió al grupo control negativo, el grupo 2 o control positivo se trató con 100 mg de dexametasona/kg/día. Los grupos 3 y 4 se trataron con 30 y 100 mg de extracto de R. graveolens respectivamente. Al grupo 5 se le administraron 100 mg de dexametasona/kg/día combinado con 100 mg de...
Tipo: Journal article
Palavras-chave: Ruta graveolens; Extracto acuoso; Toxicidad hepática; Ratas Wistar; Ruta graveolens; Aqueous extract; Liver toxicity; Wistar rats.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300043

Efectos ambientales de la colonización española desde el río Maullín al archipiélago de Chiloé, sur de Chile
Provedor de dados: 97
Autores: TORREJÓN,FERNANDO; CISTERNAS,MARCO; ARANEDA,ALBERTO.
Las características biogeográficas de Chiloé limitaron la introducción y propagación de las especies animales y vegetales exóticas que sustentaban la tradicional actividad agropecuaria hispana colonial. Dicho fenómeno condicionó la ocupación y explotación económica del territorio, contribuyendo a mitigar el tipo y extensión de las alteraciones ambientales generadas por el proceso colonizador. A través de un análisis histórico documental, que abarca los siglos XVI, XVII y XVIII, en el presente trabajo se reconocen la situación ambiental prehispánica del territorio e implicancias ambientales del poblamiento colonial; el proceso de adaptación al entorno ecológico y evolución de las actividades productivas desarrolladas por los colonos. Los principales...
Tipo: Journal article
Palavras-chave: Alteraciones ambientales; Ecología del paisaje; Introducción de especies; Colonización española; Chiloé; Sur de Chile.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400009

Efectos ambientales sobre la variabilidad espacial del ictioplancton de Chile austral durante noviembre de 2005
Provedor de dados: 97
Autores: BUSTOS,CLAUDIA A; LANDAETA,MAURICIO F; BALBONTÍN,FERNANDO.
Se analiza la distribución y abundancia del ictioplancton de Chile austral (41-45° S) durante noviembre de 2005 en relación a las características oceanógraficas de la columna de agua (temperatura, salinidad y estratificación). Durante el periodo de estudio, se recolectó un total de 44.606 huevos de peces y 2.016 larvas correspondientes a 28 taxa. Los estados tempranos de peces pelágicos pequeños dominaron en las muestras, con densidades de ~ 14.000 huevos 10 m-2 de anchoveta (Engraulis ringens) y &gt; 100 larvas 10 m-2 de clupeidos. Análisis multivariados indicaron la formación de dos grupos de estaciones, uno asociado a la zona de fiordos, de mayor profundidad, con fuertes gradientes verticales de temperatura y salinidad y mayor estratificación, y otro...
Tipo: Journal article
Palavras-chave: Mar interior; Fiordos; Larvas de peces; Frecuencia de Brunt-Váisála; Factores ambientales.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000200005

EFECTOS DE LA ADMINISTRACIÓN PRENATAL DE CAFEÍNA SOBRE LA GLÁNDULA SUBMANDIBULAR DE FETOS DE RATA
Provedor de dados: 77
Autores: de Lacerda,Suzie Aparecida; Sala,Miguel Angel; Lopes,Ruberval Armando; Semprini,Marisa; Watanabe,Ii-Sei.
Fueron estudiados los efectos de una inyección intraperitoneal única de cafeína (10 mg/kg de peso corporal) en el 10 día de preñez sobre el feto de rata, en especial sobre la glándula submandibular. Al examen microscópico fueron observadas glándulas submandibulares inmaduras, constituidas por cordones sólidos y brotes terminales, en los fetos pertenecientes al grupo tratado. Morfométricamente fue verificado aumento del tamaño nuclear en las células de los acinos y de los conductos glandulares en los fetos del grupo inyectado. Los volúmenes relativos ocupados por los conductos y por el tejido conjuntivo fueron significativamente mayores en las glándulas submandibulares del grupo inyectado. No hubo diferencias significativas entre ambos grupos, en el...
Tipo: Journal article
Palavras-chave: Glándula submandibular; Cafeína; Feto; Rata; Histopatología; Morfometría.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000100006

EFECTOS DE LA CONTAMINACION SOBRE LA DIVERSIDAD GENETICA DE MAZZAELLA LAMINARIOIDES (BORY) FREDERICQ (GIGARTINALES, RHODOPHYTA) EN BAHIAS
Provedor de dados: 73
Autores: Palma,Mario; González,Fidelina; Romo,Héctor; Ruiz,Eduardo; Fuentealba,Carmen.
Se determinó y comparó la variabilidad genética interpoblacional de Mazzaella laminaroides (Bory) Fredericq presente en Bahía Coliumo, Bahía San Vicente y Bahía Concepción, las que presentan diversos grados de contaminación. La variabilidad fue evaluada sobre la base del polimorfismo en un locus de la enzima super-óxido dismutasa en 50 ejemplares gametofitos de poblaciones de M. laminarioides en cada una de las bahías. Los sectores muestreados fueron 1) cercano al Puerto de la Segunda Zona Naval en Bahía Concepción (Talcahuano), 2) Caleta Lenga en Bahía San Vicente y 3) Dichato en Bahía Coliumo. El locus sod-1 mostró dos alelos (A y B). De los sectores estudiados, la mayor frecuencia para el alelo B se encontró en la población de Bahía Concepción con...
Tipo: Journal article
Palavras-chave: Sod-1; Mazzaella laminarioides; Diversidad genética; Contaminación.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100003

Efectos de la disminución de temperatura sobre el desarrollo de la pared de la antera y el grano de polen en Oryza sativa L.
Provedor de dados: 73
Autores: FUENTEALBA-SANDOVAL,VERÓNICA; FINOT,VÍCTOR L.; WILCKENS,ROSEMARIE; LÓPEZ- SEPÚLVEDA,PATRICIO.
Se estudió el efecto de la disminución de temperatura de 30/20 ºC (temperatura óptima) a 16 ºC (temperatura baja) durante la etapa reproductiva en el desarrollo de la antera y el polen en los cultivares de arroz &amp;#8216;Diamante-INIA&amp;#8217;, &amp;#8216;Brillante-INIA&amp;#8217; y &amp;#8216;Zafiro-INIA&amp;#8217;. Los objetivos fueron describir los daños causados por estrés térmico a nivel ultraestructural y determinar la tolerancia relativa de los cultivares a la baja temperatura. Se cultivaron plantas en macetas a 30/20 °C (día/noche) y al iniciarse la formación de la panícula parte de éstas se trasladaron a 16 ºC hasta antesis. Se recolectaron espiguillas en etapa de tétrada, micrósporas libres y polen maduro, y se realizaron cortes para...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200003

Efectos de la planta en cojín Oreopolus glacialis (Rubiaceae) sobre la riqueza y diversidad de especies en una comunidad alto-andina de Chile central
Provedor de dados: 97
Autores: BADANO,ERNESTO I; MOLINA-MONTENEGRO,MARCO A; QUIROZ,CONSTANZA; CAVIERES,LOHENGRIN A.
Las plantas en cojín que crecen en ambientes de alta montaña modifican microclimáticamente su entorno, generando microhábitats favorables para el establecimiento de otras especies, actuando como nodrizas. Varios estudios han demostrado que los cojines contienen una mayor riqueza de especies que los espacios abiertos. Sin embargo, hasta ahora, no se ha evaluado el efecto de los cojines sobre otros parámetros comunitarios como la abundancia de individuos, la diversidad y la equitatividad. En este trabajo se analiza el efecto que posee Oreopolus glacialis, una planta en cojín de la cordillera andina, sobre la riqueza, abundancia, diversidad y equitatividad de la comunidad vegetal en un ambiente de alta montaña ubicado a 1.900 m en Chile central. Se determino...
Tipo: Journal article
Palavras-chave: Facilitación efecto nodriza interacciones positivas cojines; Andes Andes.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400011

EFECTOS DE LA PODA DE VERANO Y EL ANILLADO DE CORTEZA EN CHIRIMOYO (Annona cherimola Mill.) var. CONCHA LISA
Provedor de dados: 113
Autores: Razeto M.,Bruno; Díaz de Valdés I.,Evelyn.
Se realizó un ensayo en un huerto de chirimoyos (Annona cherimola Mill.) de 7 años var. Concha Lisa, ubicado en la localidad de Hijuelas (32º 46' lat. Sur, 71º 08' long. Oeste), provincia de Quillota, V Región, Chile. Los tratamientos, realizados bajo diseño experimental completamente al azar y con cinco repeticiones, de un árbol cada una, fueron los siguientes: despunte de brotes a 6 yemas, despunte de brotes a 10 yemas, despunte de brotes a 10 yemas más desbrote, anillado de corteza, anillado de corteza más despunte de brotes a 10 yemas y rayado de corteza. Las evaluaciones se efectuaron con mediciones de diámetro de tronco, longitud de brotes, peso del material eliminado en la poda, porcentaje de cuaja final, producción de fruta, peso y forma del fruto,...
Tipo: Journal article
Palavras-chave: Despunte de brotes; Desbrote; Crecimiento vegetativo; Producción de fruta; Peso del fruto; Fecha de cosecha.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000200011

Efectos de la producción de semillas y la heterogeneidad vegetal sobre la supervivencia de semillas y el patrón espacio-temporal de establecimiento de plántulas en Araucaria araucana
Provedor de dados: 97
Autores: SANGUINETTI,JAVIER; KITZBERGER,THOMAS.
El establecimiento de plántulas puede estar limitado por la producción de semillas y asociada a la producción intermitente y sincronizada de semillas (masting) y/o por granivoría, o por falta de micrositios aptos para la germinación y crecimiento de las plantas. La dispersión y supervivencia de semillas desde el árbol madre pueden determinar el patrón espacial del establecimiento y la literatura propone varios modelos de distancia madre-plántula. En este trabajo se estudiaron los efectos del masting, de la depredación de semillas y de la vegetación sobre el establecimiento en A. araucana. A partir de datos sobre producción de conos, sobre supervivencia de semillas y mediante el registro de plántulas a escala del árbol en distintos micrositios se evaluó el...
Tipo: Journal article
Palavras-chave: Araucaria araucana; Establecimiento; Masting; Modelo de Janzen-Connell.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300001

EFECTOS DE LA PROFUNDIDAD DE PLANTACIÓN Y POBLACIÓN DE PLANTAS EN LA CALIDAD Y RENDIMIENTO DE ESPÁRRAGO VERDE
Provedor de dados: 113
Autores: González A.,María Inés; del Pozo L.,Alejandro.
Se estudió el efecto de tres profundidades (10, 20 y 30 cm) y dos densidades de plantación (22.222 y 33.333 plantas ha-1) sobre el rendimiento y calidad del espárrago (Asparagus officinalis L.) en la zona climática mediterránea sub-húmeda de Chile. Se trasplantaron coronas del cv. UC-157 F1 a un suelo de origen volcánico en septiembre de 1995. El diseño experimental fue de bloques completos al azar en un arreglo factorial con cuatro repeticiones. Las parcelas fueron cosechadas diariamente durante cinco temporadas (1997-2001), y se determinó el número, peso y diámetro de los turiones después de cortarlos a 18 cm. No se detectó interacción entre los factores en estudio sobre el rendimiento y sus componentes. La densidad de plantas sólo tuvo efecto en la...
Tipo: Journal article
Palavras-chave: Asparagus officinalis L.; Número de turiones; Número de yemas; Producción.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000300001

EFECTOS DE LA RESTRICCIÓN DEL RIEGO EN DISTINTOS PERÍODOS DE DESARROLLO DE LA VID CV. CABERNET SAUVIGNON SOBRE PRODUCCIÓN Y CALIDAD DEL VINO
Provedor de dados: 113
Autores: Ferreyra E.,Raúl; Selles V.,Gabriel; Peralta A.,Jose; Burgos R.,Loreto; Valenzuela B.,Jorge.
Se aplicaron diferentes tratamientos de estrés hídricos en vides (Vitis vinifera L.) cv. Cabernet Sauvignon durante las temporada 1994/95 y 1995/96, en el Centro Regional de Investigaciones La Platina , Santiago (33º34' lat. Sur; 70º38' long. Oeste). Los tratamientos T1 y T2 correspondieron a 100% y 40% de evapotranspiración de cultivo (ETc) durante toda la estación; T3, sin riego desde brotación a pinta y riego con 100% de ETc hasta la cosecha; T4, riego con 100% de ETc entre brotación a pinta y suspensión del riego desde pinta hasta la cosecha. En los tratamientos con estrés (T2, T3 y T4) se redujo significativamente el peso y tamaño de bayas. También se redujo el rendimiento, principalmente cuando no se aplicó agua entre el brotación y pinta (T3)....
Tipo: Journal article
Palavras-chave: Estrés hídrico; Vid.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000300006

Efectos de la Selección y de la Superovulación en las Pérdidas Gestacionales de Ratonas CF1
Provedor de dados: 77
Autores: Bernardi,S. F; Brogliatti,G; Oyarzabal,M. I.
En un par de líneas de ratones seleccionadas para alto (s') y bajo peso (s), originadas a partir de una población no seleccionada de la cepa CF1 (t), se modificó la estructura ovárica. El diámetro de los folículos ováricos y el número de folículos y de cuerpos lúteos se incrementaron en las hembras de la línea s', sin expresarse en un mayor tamaño de camada al nacimiento, posiblemente, por un aumento de las pérdidas gestacionales. Se probó si los efectos conjuntos de la selección de peso a largo plazo y de la estimulación ovárica incrementaban las pérdidas gestacionales. Se utilizaron dos grupos de hembras por línea: sin y con estimulación ovárica (5UI de eCG y 5UI de hCG). Las hembras se sacrificaron a las 56-72 hs y a los 7 días postservicio y después de...
Tipo: Journal article
Palavras-chave: Cuerpos lúteos; Embriones; Sitios de implantación; Tamaño de camada; Eficiencia reproductiva.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100035

EFECTOS DE LAS ENMIENDAS ORGÁNICAS SOBRE LAS PROPIEDADES FÍSICAS DEL SUELO CON ESPECIAL REFERENCIAS A LA ADICIÓN DE LODOS URBANOS
Provedor de dados: 127
Autores: Cuevas B,José; Seguel S,Oscar; Ellies Sch,Achim; Dörner F,José.
Los lodos urbanos, la mayoría orgánicos, provenientes de los tratamiento de aguas servidas han aumentado en los últimos años en Chile. Esto ha generado la necesidad de su disposición final. En una primera instancia los lodos se acopian en rellenos sanitarios los cuales más tarde pueden ser utilizado como enmiendas sobre suelos agrícolas y forestales. En el presente trabajo se analiza algunos antecedentes acerca de los efectos de la aplicación de lodos sobre las propiedades físicas de suelos agrícolas y las necesidades de investigaciones futuras. Los lodos son aplicados en altas cantidades al suelo para obtener respuestas sobre el rendimiento de los cultivos y como enmiendas para mejorar las propiedades físicas del suelo. Sin embargo, los lodos pueden...
Tipo: Journal article
Palavras-chave: Lodos municipales; Propiedades físicas del suelo; Calidad ambiental del suelo.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000200001

Efectos de las Experiencias Adversas Temprana y Tardía en las Características Morfométricas y Estereológicas de la Glándula Suprarrenal de Ratas Sprague Dawley Sometidas a Estrés Durante su Vida Adulta
Provedor de dados: 77
Autores: Vásquez,Bélgica; Sandoval,Cristian; Sanhueza,Carla; Silva,Jaime; del Sol,Mariano.
La ruptura temprana del vínculo materno y el aislamiento social son variables que están involucradas con los comportamientos social y emocional y también con el aumento de la ansiedad, especialmente en situaciones estresantes. Sin embargo, no se dispone de investigaciones que expliquen los cambios morfológicos de la glándula suprarrenal (GSR). Por lo anterior, el objetivo de este trabajo fue conocer experimentalmente, a través del modelo de alteración del vínculo social temprano madre-cría y alteración del vínculo social tardío por aislamiento, el efecto sobre las características morfométricas y estereológicas de la GSR, en ratas de la cepa Sprague Dawley sometidas a estrés crónico intermitente en la vida adulta. Utilizamos 35 ratas hembras recién nacidas,...
Tipo: Journal article
Palavras-chave: Rata; Estrés; Experiencia adversa; Glándula suprarrenal.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100002

Efectos de una barrera antrópica sobre la migración río arriba del langostino anfídromo Macrobrachium tenellum (Smith 1871) (Decapoda: Palaemonidae) en la costa del Pacífico mexicano
Provedor de dados: 72
Autores: RODRÍGUEZ-URIBE,MARÍA-CAROLINA; VEGA-VILLASANTE,FERNANDO; GUZMÁN-ARROYO,MANUEL; ESPINOSA-CHAURAND,LUIS-DANIEL.
Se evaluó el comportamiento migratorio río arriba de juveniles Macrobrachium tenellum en la compuerta de descarga libre de un estanque artificial, a través de muestreos en los meses de septiembre, octubre, noviembre y diciembre (2012) en horarios de 7,14 y 21 h (n=39) y en un ciclo de 24 h (n=10). El fenómeno migratorio es preponderantemente nocturno, ya que: a) la mayor abundancia de juveniles migrando es a las 0 h (6663 ind/m2), mientras que la menor a las 14 h (247 ind/ m2); la máxima abundancia de juveniles que pasa al estanque, para continuar con la migración, es a las 2:30 h (2700 ind/h) y la mínima es de las 14 h a 17 h (1 ind/h); de los que se desvían y mueren, debido a que pasan al área circundante, la mayor abundancia es a las 22:30 h (4140...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000100002

Efectos del ácido giberélico, bencilaminopurina y fluridona en la germinación in vitro de Ugni molinae Turcz. (Myrtaceae)
Provedor de dados: 73
Autores: RODRÍGUEZ BERAUD,MARIO; HORMAZÁBAL VÁSQUEZ,NELSON; ARANEDA DURÁN,XIMENA; TAMPE PÉREZ,JOCELYNE; LOBOS MARAMBIO,VICTORIA; CASTILLO RUBIO,CLAUDIA.
En la presente investigación se estudiaron los efectos de bencilaminopurina (BAP), ácido giberélico (GA ) y fluridona (FLU) sobre la germinación in vitro de murtilla (Ugni molinae), una especie nativa de Chile. La semilla de murtilla presenta una fuerte dormancia, razón por la cual se realizaron dos ensayos a fin de mejorar la germinación. Los resultados indican que FLU, un inhibidor de la síntesis de ABA, fue el más eficaz en romper la dormancia. La combinación de 10 &amp;#956;M de FLU con BAP o GA mejoraron la germinación, siendo FLU + GA la más óptima, ésta fue capaz de elevar la germinación de 34% en el testigo a 96% a los 60 días. Lo anterior sugiere que en los mecanismos de dormancia de la semilla de U. molinae está involucrada la presencia de ABA.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100010

Efectos del Albendazol en el Hígado de Feto de Rata: Estudios Morfológico y Morfométrico
Provedor de dados: 77
Autores: Carrara Moreti,Dora Lúcia; Lopes,Ruberval Armando; Vinha,Dionisio; Sala,Miguel Angel; Semprini,Marisa; Friedrichi,Christiane.
El objetivo del presente trabajo fue caracterizar morfológica, morfométrica y estereológicamente las alteraciones causadas por la administración de albendazol en ratas preñadas en el hígado de los fetos. Fueron usadas ratas Wistar, que recibieron entre los días 9 y 11 de la preñez, una dosis diaria de 5 mg/kg de peso de albendazol. Las ratas control recibieron volumen semejante de suero fisiológico en los mismos días. Al 20 día, las ratas fueron sacrificadas por inhalación de éter, siendo retirados los fetos e inmediatamente fijados en alfac por 24 h. Los fetos, úteros y placentas, luego de fijados, fueron secados en papel de filtro y pesados en balanza de precisión, siendo medidos los cordones umbilicales con nonio. Los cuerpos de los fetos fueron...
Tipo: Journal article
Palavras-chave: Hígado; Feto; Rata; Albendazol; Morfometría.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200003

EFECTOS DEL CADMIO EN LA MUCOSA YUGAL DE LA RATA DURANTE LA LACTANCIA. ESTUDIO MORFOLÓGICO E HISTOMÉTRICO
Provedor de dados: 77
Autores: Lara,Cristina Picoli; Watanabe,Ii-Sei; Lopes,Ruberval Armando; Sala,Miguel Angel; Picoli,Fábio.
El cadmio del aire, agua y alimentos tiene potencial de afectar la salud de las personas, principalmente de aquellas que viven en regiones industrializadas. El cadmio afecta la función placentaria, pudiendo atravesar la barrera trofoblástica y provocar alteraciones en el desarrollo del feto; puede, también, ser excretado por la leche. El organismo es particularmente susceptible a la exposición al cadmio en el periodo perinatal. Se estudió el efecto de la intoxicación por cadmio en el epitelio vestibular y suelo de la boca de ratas expuestas a niveles bajos de cadmio en el agua del bebedero, durante la lactancia. Las ratas recibieron agua ad libitum conteniendo 300 mg/l de CdCl2 durante los 21 días de lactancia. Los animales controles recibieron un volumen...
Tipo: Journal article
Palavras-chave: Mucosa oral; Cadmio; Lactancia; Rata; Histopatología; Morfometría.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000300002

Efectos del Cadmio Sobre las Glándulas Salivales de Rata, Durante la Lactancia
Provedor de dados: 77
Autores: Friedrichi,Christiane; Lopes,Ruberval Armando; Sala,Miguel Angel; Felippini,Ana Luiza de C; Issa,João Paulo M; Watanabe,Ii-Sei; Lopes,Túlio Roberto V. P.
El cadmio (Cd), presente en el aire, agua potable y alimentos, tiene potencial para afectar la salud humana, principalmente en las regiones altamente industrializadas. El Cd además de afectar la función placentaria, puede atravesar la barrera placentaria y perjudicar directamente el desarrollo fetal. En virtud de que el organismo es particularmente susceptible a la exposición al Cd durante el período perinatal, y que ese metal puede ser excretado en la leche, el objetivo del presente trabajo fue estudiar los efectos de la exposición continua a agua potable conteniendo bajos niveles de Cd durante la lactancia sobre las glándulas salivales de la rata. Ratas hembra recibieron agua potable conteniendo 300mg/l de CdCl2 ad libitum durante toda la lactancia....
Tipo: Journal article
Palavras-chave: Cadmio; Rata; Lactancia; Glándulas salivales; Histometría.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400028

Efectos del Cloruro de Cobalto sobre el Epitelio de Unión y Epitelio Reducido del Esmalte del Primer Molar Superior de Rata
Provedor de dados: 77
Autores: Felippini,Ana Luiza de C; Lopes,Ruberval Armando; Sala,Miguel Angel; Watanabe,Ii-Sei; Lopes,Túlio Roberto V.P; Issa,João Paulo M; Ribas,José Paulo.
El cobalto es uno de los principales componentes de las aleaciones metálicas fundidas, usadas frecuentemente en odontología. El metal es el constituyente de 45 a 70% de los trabajos protéticos. En virtud de la existencia de evidencias que elementos metálicos pueden causar toxicidad sistémica y local, este trabajo tuvo como objetivo evaluar los efectos del cobalto sobre el epitelio de unión y el epitelio del esmalte del primer molar superior de rata, durante la lactancia. Con esa finalidad fueron usadas ratas con 1 día de vida postnatal, cuyas madres recibieron 300 mg de cloruro de cobalto por litro de agua destilada en el bebedero, durante a la lactancia. Al cabo de 21 días, las crías fueron sacrificadas con sobredosis anestésica. Las cabezas fueron...
Tipo: Journal article
Palavras-chave: Cobalto; Rata; Lactancia; Epitelio de Unión; Epitelio Reducido del Esmalte.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400021

EFECTOS DEL ENCALADO Y LA FERTILIZACIÓN NITROGENADA SOBRE EL DESARROLLO DE Oenothera affinis EN UN SUELO AFECTADO POR LA MINERÍA DEL COBRE
Provedor de dados: 127
Autores: Muena,Victoria; González,Isabel; Neaman,Alexander.
El valle de Puchuncaví (Chile central) ha sido expuesto a las emisiones aéreas provenientes de la fundición de cobre Ventanas. Actualmente, los suelos en las cercanías de la fundición presentan una escasa vegetación, son ácidos, deficientes en nitrógeno y contaminados con metales. Para reducir el riesgo ambiental, es necesario remediar estos suelos. La fitoestabilización considera el uso de plantas capaces de almacenar los metales en sus estructuras subterráneas, reduciendo así su movimiento desde el suelo contaminado al aire y al agua. El éxito del tratamiento depende de la aplicación de enmiendas adecuadas que reducen la solubilidad de los metales en los suelos y, a la vez, mejoran sus condiciones para el desarrollo de la planta. Se evaluó el efecto del...
Tipo: Journal article
Palavras-chave: Fitorremediación; Fitoestabilización; Fundición Ventanas; Metalófita; Biodisponibilidad; Revegetación.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000200002

Efectos del Entrenamiento de Natación sobre la Asimetría Corporal en Adolescentes
Provedor de dados: 77
Autores: Palomino-Martín,Antonio; González-Martel,Verónica; Quiroga-Escudero,Miriam Esther; Ortega-Santana,Francisco.
El objetivo fue realizar una evaluación antropométrica de ambos hemisferios corporales en nadadores adolescentes. La muestra estuvo formada por 83 nadadores (52 hombres y 31 mujeres) con una edad media de 15,21±1,90 años. Sus valores antropométricos fueron analizados en función de las siguientes variables: edad, género, años de entrenamiento, estilo de nado (simultáneo o alternativo), lado dominante, lado no dominante, lado de respiración, peso y estatura, con el fin de determinar la existencia o no de diferencias en la composición de cada lado del cuerpo del nadador. Para evaluar la composición corporal se utilizaron: pliegues (tricipital, subescapular, bicipital, cresta iliaca, supraespinal, abdominal, anterior del muslo y pierna), longitudes (brazo,...
Tipo: Journal article
Palavras-chave: Antropometría; Natación; Composición corporal; Somatotipo.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200016

Efectos del fósforo y carbono lábiles en la fijación no simbiótica de N2 en hojarasca de bosques siempreverdes manejados y no manejados de la Isla de Chiloé, Chile
Provedor de dados: 97
Autores: PÉREZ,SANDRA E; PÉREZ,CECILIA A; CARMONA,MARTÍN R; FARIÑA,JOSÉ M; ARMESTO,JUAN J.
El flujo de entrada de nitrógeno (N) en ecosistemas de bosques templados de la Isla de Chiloé puede ocurrir en una proporción importante vía fijación no simbiótica (FNS). Debido a que este proceso es llevado a cabo por bacterias (diazótrofas) está regulado, además del efecto de factores climáticos (temperatura y humedad), por la disponibilidad de nutrientes, en particular fósforo y carbono como fuentes de energía. Nuestra hipótesis es que si el fósforo y el carbono son limitantes para la FNS, esta limitación se acentuaría en bosques manejados, en donde adición experimental de P y C deberían estimular la actividad microbiana. En este trabajo se determinó los efectos de la adición de cuatro niveles de fósforo inorgánico (0 mmol P/L, 0,645 mmol P/L, 3,23 mmol...
Tipo: Journal article
Palavras-chave: Bosques manejados; Laureliopsis philippiana; Ensayo de reducción de acetileno; Actividad bacteriana.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000200009

Efectos del fuego sobre un bosquecillo de Polylepis australis (Rosaceae) en las montañas de Córdoba, Argentina
Provedor de dados: 97
Autores: RENISON,DANIEL; CINGOLANI,ANA M; SUAREZ,RICARDO.
El fuego es usado para transformar bosques en pastizales y estimular el rebrote de los pastos para aumentar su valor forrajero. Según algunos autores, este uso del fuego ha provocado una retracción de los bosques de Polylepis a sitios rocosos inaccesibles al fuego, mientras que otros autores postulan que su distribución es debida al ambiente favorable en las rocas y no a la acción del fuego. Aquí evaluamos el efecto relativo del fuego y el ambiente sobre la supervivencia, producción de semillas y crecimiento de Polylepis australis Bitter (Rosaceae) en un bosquecillo de las montañas de Córdoba. Realizamos un seguimiento de 74 individuos quemados y controles durante 3,5 años. La presencia de rocas tuvo una fuerte influencia en el porcentaje en que se...
Tipo: Journal article
Palavras-chave: Polylepis australis; Fuego; Supervivencia y crecimiento; Microhábitat.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400007

Efectos del Láser de Baja Intensidad (As-Ga-Al 904 nm) sobre el Cóndilo Mandibular de Conejos: Análisis a través de Tomografía Computadorizada Cone Beam
Provedor de dados: 77
Autores: Alves,Nilton; Garay,Ivonne; Deana,Naira Figueiredo.
En la literatura científica los efectos adversos del láser de baja intensidad (LBI) no están descritos de forma precisa, tampoco su inocuidad. El objetivo de este estudio fue evaluar el efecto de distintas dosis de LBI en el cóndilo mandibular de conejos. Dieciséis conejos divididos aleatoriamente en cuatro grupos experimentales (GE) de 4 animales fueron utilizados en este estudio. Se realizó un examen de tomografía computarizada cone beam (TCCB) de ambas articulaciones temporomandibulares (ATMs) de todos los animales que fueron utilizadas como control (GC). Luego, irradiamos cada ATM con LBI (As-Ga-Al 904 nm), 100 mW, spot 0,2 cm2, dos puntos, 3 veces/semana, totalizando 10 veces, con dosis de 15 J/cm2 (GE-1), 45 J/cm2 (GE-2), 60 J/ cm2 (GE-3) y 90 J/cm2...
Tipo: Journal article
Palavras-chave: Tomografía computarizada cone-beam; Articulación temporomandibular; Conejo; Modelo animal; Láser de baja intensidad.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100031

Efectos del pastoreo sobre el banco de semillas germinable y la vegetación establecida en pastizales de montaña del centro de Argentina
Provedor de dados: 97
Autores: MARQUEZ,SEBASTIÁN; FUNES,GUILLERMO; CABIDO,MARCELO; PUCHETA,EDUARDO.
Se estudió el efecto del pastoreo sobre el banco de semillas y la vegetación establecida en pastizales naturales de montaña, en Pampa de Achala, Córdoba, Argentina. Se analizó el banco de semillas germinable a dos profundidades (0-5 y 5-10 cm), en cinco réplicas de sitios pastoreados a carga moderada-intensa y otros cinco de sitios excluidos al pastoreo por 10 años. Se registró la frecuencia de las especies presentes en la vegetación establecida y la abundancia de las especies en el banco de semillas. El pastoreo no produjo cambios significativos en el número de especies de la comunidad establecida, pero sí produjo un incremento en la diversidad de especies debido a una disminución de la frecuencia de algunos pastos perennes como Deyeuxia hieronymi y...
Tipo: Journal article
Palavras-chave: Pastoreo; Exclusión; Vegetación establecida; Diversidad; Banco de semillas transitorio; Banco de semillas persistente.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000200006

Efectos del retardo del asentamiento en las expectativas de vida del briozoo Bugula flabellata (Bryozoa: Gymnolaemata)
Provedor de dados: 97
Autores: CANCINO,JUAN M; GALLARDO,JOSÉ A.
En presencia de un substrato adecuado las larvas lecitotróficas del briozoo Bugula flabellata se asientan preferentemente durante las primeras seis horas luego de su liberación desde las cámaras de incubación, mientras que un porcentaje marginal (&lt;IMG SRC="http:/fbpe/img/rchnat/v77n2/figura8.jpg" WIDTH=20 HEIGHT=12&gt;1 %) pospone el asentamiento entre 6 y 24 h. En este trabajo se demuestra que las larvas de B. flabellata forzadas, por agitación mecánica, al posponer el asentamiento entre 6 y 54 h reducen significativamente su adecuación biológica. Las larvas mantienen su capacidad para asentarse en un nivel cercano al 95 % durante las primeras 24 h de natación. Posteriormente solo un 30 % de las larvas forzadas a retrasar el asentamiento por 24 a 48 h...
Tipo: Journal article
Palavras-chave: Liberación larval; Natación larval; Asentamiento; Metamorfosis; Bugula; Adecuación biológica.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000200002

Efectos del rizocéfalo Loxothylacus armatus (Cirripedia: Rhizocephala) en el cangrejo Paraxanthus barbiger (Decapoda: Brachyura) en Chile
Provedor de dados: 97
Autores: GEORGE-NASCIMENTO,MARIO; BUSTOS,JOSÉ.
Diversas asociaciones biológicas de amplia distribución y alta especificidad en el ambiente marino han pasado casi desapercibidas para los estudiosos en Chile. Aquí se describe cuantitativamente la infección por Loxothylacus armatus Boschma 1949 (Cirripedia: Rhizocephala) en el cangrejo Paraxanthus barbiger (Poeppig 1836) (Decapoda: Brachyura) y se evalúa si el parásito produce efectos semejantes a los descritos para asociaciones similares. Para ello, 513 ejemplares del cangrejo fueron recolectados manualmente desde el submareal somero, entre septiembre y octubre de 2003, en Lenga, Octava Región de Chile. La prevalencia de rizocéfalos alcanzó valores máximos cercanos al 60 % en hospedadores de pequeño tamaño corporal, provocando castración, inhibiendo el...
Tipo: Journal article
Palavras-chave: Asociaciones biológicas; Rhizocephala-Decapoda; Chile; Ecología de comunidades; Castración parasitaria; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200001

Efectos del Sistema de Cosecha de Ensilaje de Pradera Sobre el Comportamiento Productivo de toretes en Crecimiento
Provedor de dados: 113
Autores: Elizalde V,Hernán Felipe; Goic M,Ljubo; Pinninghoff S-J,Jorge.
El presente experimento se realizó con el objeto de evaluar tres sistemas de cosecha de una pradera permanente para ensilaje y su utilización en producción de carne. Los tratamientos fueron: (A) corte directo, sin repicador; (B) corte directo, con repicador; y (C) segado, marchitamiento por 72 h y recolección con cosechadora con repicador. Se utilizaron 21 toretes de raza Frisón Negro, con un PV inicial de 200 kg, separados en tres grupos, que durante 57 días recibieron ensilaje ad libitum, obtenido a partir de los tres tratamientos. Todos los animales fueron suplementados con 300 g de harina de pescado y 65 g de sales minerales por animal por día. La composición química de los ensilajes fue diferente, con valores de contenido de MS de 13,8, 14,6 y 30,9%...
Tipo: Journal article
Palavras-chave: Sistemas de cosecha de ensilaje; Ensilajes marchitos; Ensilaje de pasto; Toretes; Peso vivo.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000300005

Efectos del Tratamiento con Vitamina E en el Tubo Neural y Médula Espinal en Embriones y Fetos de Ratones Mus musculus Expuestos al uso de Ácido Valproico
Provedor de dados: 77
Autores: Conei Valencia,Daniel; Soler Guerra,Bárbara; Saint-Pierre Contreras,Gustavo; Ortiz Contreras,Jovita; Rojas Rauco,Mariana.
El ácido valproico (VPA) es el principal anticonvulsivante utilizado contra la epilepsia durante la gestación. Sin embargo, en etapas iniciales del embarazo actúa como teratógeno y ocasiona malformaciones como fisura labio-palatina, alteraciones en el desarrollo genital y espina bífida, siendo esta última la más frecuente. Esto se produce debido al aumento de especies reactivas de oxígeno, pudiendo contrarrestarse administrando vitamina E. El objetivo fue determinar si la vitamina E disminuye el daño en tubo neural y médula espinal de embriones y fetos de ratonas expuestas a VPA. Se conformaron 8 grupos de animales. A los 8 días post-fecundación se les administró a los grupos 1 y 5 suero fisiológico 0,3 mL; grupos 2 y 6 VPA 600 mg/Kg; grupos 3 y 7 VPA 600...
Tipo: Journal article
Palavras-chave: Ácido valproico; Vitamina E; Médula espinal; Tubo neural.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200049

EFECTOS ECOTOXICOLOGICOS DEL CARTAP SOBRE POECILIA RETICULATA "GUPPY'' (POECILIDAE) Y PARACHEIRODON INNESI "NEON TETRA'' (CHARACIDAE)
Provedor de dados: 72
Autores: Iannacone,Jose; Onofre,Roxana; Huanqui,Olga.
Se evaluó el impacto ecotoxicológico del insecticida carbámico cartap (1,3 di (carbamoytio)-2-dimetiloaminopropano) usado para el control de plagas agrícolas y como molusquicida de vectores de importancia en Salud Pública, sobre dos especies de peces del ecosistema acuático continental: Poecilia reticulata (Peters 1859) "guppy" (Poecilidae) y Paracheirodon innesi (Myers 1936) ``Neon Tetra" (Characidae). Ellos fueron utilizados como organismos no destinatarios en ensayos de corta duración, para determinar el impacto toxicológico del cartap. Para ambas especies de peces se evaluó el porcentaje de mortalidad, y dos respuestas subletales: el incremento del movimiento opercular y el nado extraño. A 3 h de exposición para P. reticulata, se encontró un valor de...
Tipo: Journal article
Palavras-chave: Bioensayo; Cartap; Insecticida; Paracheirodon; Poecilia.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200005

Efectos en el Sistema Suelo-Planta Después de Tres Años de Aplicación de Purín de Cerdo como Fertilizante en un Cultivo de Brócoli (Brassica oleracea L.)
Provedor de dados: 127
Autores: Llona C,Miriam; Faz C,Angel.
Este trabajo tiene como objetivo determinar la dosis de aplicación correcta de purines de cerdo como fertilizante minimizando sus efectos contaminantes. Para ello se experimentó con un cultivo hortícola de riego representativo de la zona de estudio. La experiencia, que duró 3 años, cultivando brócoli, se realizó en 4 parcelas (630 m²) con distintas aplicaciones de purín de cerdo: sin purín y tres dosis de 4,86 L/m², 11,05 L/m² y 14,86 L/m², parcelas control, B, C y D respectivamente. Tras la experiencia, el suelo presenta incrementos importantes en N, P, K y carbono orgánico, especialmente después de sucesivas aplicaciones y en dosis altas, además, se observa un ligero aumento del pH y un descenso de la conductividad eléctrica; los oligoelementos...
Tipo: Journal article
Palavras-chave: Purín de cerdo; Características físico-químicas suelo; Brócoli; Fertilizante.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000100005

Efectos Sobre el Comportamiento de Ratas Wistar Tratadas con el Compuesto Fenólico DM1
Provedor de dados: 77
Autores: Gonçalves,I. D; Quincoces,J. A; Santos,R. P; dos Santos,G. A. A; Olave,E; Pardi,P.
El presente estudio tuvo como objetivo evaluar el efecto del compuesto fenólico polifuncional DM1 sobre el comportamiento motor, exploratório y ansiedad en ratas Wistar, analizadas en campo abierto (CA) y laberinto en cruz elevada (LCE). Se utilizaron 40 ratas Wistar adultas, divididas en 5 grupos (n= 8): Control (vehículo), DZP (Diazepam-2 mg/kg), DM1-150 mg/kg, DM1-300 mg/kg y DM1-450 mg/kg. Los animales fueron evaluados por un período de cinco minutos en CA y en el LCE, 30 min después de las administraciones (vía intraperitoneal). La evaluación en CA demostró reducción de la locomoción en los grupos DZP, DM1-300 y DM1-450 en relación al grupo control. Aumentó la locomoción en el grupo DM1-150 en relación al grupo DZP y disminuyó la locomoción en el...
Tipo: Journal article
Palavras-chave: Polifenoles; Campo abierto; Laberinto en cruz elevada; Comportamiento.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400053

EFECTOS TOXICOLOGICOS DE CUATRO PLANTAS SOBRE EL GORGOJO DEL MAIZ SITOPHILUS ZEAMAIS MOTSCHULSKY 1855 (COLEOPTERA: CURCULIONIDAE) Y SOBRE EL GORGOJO DE LAS GALLETAS STEGOBIUM PANICEUM (LINNAEUS 1761) (COLEOPTERA: ANOBIIDAE) EN PERU
Provedor de dados: 72
Autores: Iannacone,José; Ayala,Hildebrando; Román,Amid.
Se evaluó el efecto biocida de cuatro plantas: culantro Coriandrum sativum L. (Apiaceae), tara Caesalpinia spinosa (Mol.) Kuntze (Fabaceae), amor seco Bidens pilosa L. (Asteraceae) y saúco Sambucus peruviana HBK (Caprifoliaceae) sobre adultos de Sitophilus zeamais Motschulsky 1885 (Curculionidae) y Stegobium paniceum (Linnaeus 1761) (Anobiidae) en bioensayos de mortandad bajo condiciones de laboratorio. A las máximas concentraciones empleadas (20 % p/v), los extractos acuosos de C. sativum, C. spinosa, B. pilosa y S. peruviana no mostraron efectos significativos en comparación con el control sobre ambas especies de gorgojos. Sólo los polvos secos de C. sativum produjeron un 25 % de mortandad en S. zeamais, y en cambio, C. sativum ocasionó sobre S....
Tipo: Journal article
Palavras-chave: Bidens pilosa; Caesalpinia spinosa; Coriandrum sativum; Extractos vegetales; Gorgojos; Insecticidas botánicos; Sambucus peruviana.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200003

EFECTOS TOXICOLÓGICOS DE EXTRACTOS DE MOLLE (Schinus molle) Y LANTANA (Lantana camara) SOBRE Chrysoperla externa (NEUROPTERA: CHRYSOPIDAE), Trichogramma pintoi (HYMENOPTERA: TRICHOGRAMMATIDAE) Y Copidosoma koehleri (HYMENOPTERA: ENCYRTIDAE) EN EL PERÚ
Provedor de dados: 113
Autores: Iannacone O.,José; Lamas M.,Gerardo.
Extractos de dos plantas; el molle (Schinus molle L., Anacardiaceae) y la lantana (Lantana camara L., Verbenaceae), se evaluaron sobre huevos, larvas de primer estadio y pupas de Chrysoperla externa Hagen (Neuroptera: Chrysopidae), y sobre estados inmaduros y adultos de los microhimenopteros Trichogramma pintoi Voegelé (Trichogrammatidae) y Copidosoma koehleri Blanchard (Encyrtidae), en bioensayos toxicológicos bajo condiciones de laboratorio. Los extractos acuosos (F1) del molle y la lantana a las concentraciones aplicadas no causaron efectos significativos en la mortalidad de las larvas (ensayo de residualidad) y pupas (ensayo de inmersión) de C. externa, pero los extractos hexánicos (F2; 10%) de molle y lantana, y el acetónico (F3; 10%) de lantana...
Tipo: Journal article
Palavras-chave: Insecticidas botánicos; Insectos benéficos; Enemigos naturales; Lantana camara; Schinus molle.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000400002

Efectos tóxicos de los insecticidas clorpirifos y teflutrina sobre la lombriz de tierra (Lumbricus terrestris L.)
Provedor de dados: 113
Autores: Giménez,Rosana; Della Penna,Angela; Odello,Ezequiel.
Para evaluar la ecotoxicidad de clorpirifos y teflutrina sobre Lumbricus terrestris L., se realizó una prueba de laboratorio, basado en el protocolo de la Organización Internacional de Control Biológico (IOBC). Las lombrices fueron recolectadas a mano en un suelo libre de plaguicidas, en el campo de la Facultad de Agronomía, Universidad de Buenos Aires, Argentina y colocadas en suelo esterilizado, en condiciones de oscuridad y 12°C durante cinco días, alimentadas con hojas secas de trébol blanco (Trifolium repens L.). Se colocó una lombriz mayor a 1,5 g sin clitelo por embudo de Daniel, con diez hojas secas de trébol blanco sobre la superficie. Los tratamientos fueron: 1) testigo, agua no clorada; 2) 30 mg L-1 de solución de cloroacetamida (97,37%); 3)...
Tipo: Journal article
Palavras-chave: Ecotoxicología; Lombriz de tierra; Plaguicidas.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000400003

EFEITO DA ÉPOCA DE ADUBACÃO NITROGENADA EM COBERTURA NA PRODUCÃO E QUALIDADE FISIOLÓGICA DE SEMENTES DE ERVILHA (Pisum sativum L)
Provedor de dados: 127
Autores: de Souza Romero,Nilton Carlos; Iwamoto Haga,Kuniko; Orioli Júnior,Valdeci; Duarte Cardoso,Eliana.
Um fator importante na produção das culturas é a disponibilização do nutriente na época certa para que os efeitos no crescimento e desenvolvimento alcancem os melhores resultados. No presente trabalho, foram testadas as épocas de realização da adubação nitrogenada (120 kg ha-1), aplicada em cobertura aos 20 (T20), 25 (T25), 30 (T30), 35 (T35) e 40 (T40) dias após a emergência em oito cultivares de ervilha {Pisum sativum L) (María, Kodama, Mikado, Flávia, Luiza, Amelia, Dileta e Marina), objetivando avaliar seu efeito na produção de grãos e qualidade fisiológica das sementes em condições de cerrado. Após a colheita, as sementes foram submetidas ao teste de qualidade fisiológica (testes de germinação, condutividade elétrica e emergência em campo). A análise...
Tipo: Journal article
Palavras-chave: Pisum sativum L; Nitrogênio; Épocas de aplicação; Qualidade de sementes.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000300001

Effect of 0.25 ppm Ozone exposure on pulmonary damage induced by bleomycin
Provedor de dados: 48
Autores: OYARZÚN,MANUEL; DUSSAUBAT,NELSON; GONZÁLEZ,SERGIO.
To study the effect of ozone in a chronically damaged lung, we used a bleomycin (BLM) induced pulmonary fibrosis model. Both endotracheal instillation of BLM and O3 exposure both produce lung inflammation and fibrosis. Oxidative stress would be a common mechanism of damage for both BLM and O3. Our aim was to assess lung injury induced by 5 and 60 days of intermittent exposure to 0.25 ppm O3 in rats with bleomycin-induced pulmonary fibrosis. Thirty-day-old Sprague Dawley rats were endotracheally instilled with BLM (1 U/100 g body weight) and, 30 days later, exposed to 0.25 ppm O3 (0.25 ppm 4 h per day, 5 days a week). Histopatology controls were instilled with saline and breathing room air. Histopathological evaluation of lungs was done 5 and 60 days after...
Tipo: Journal article
Palavras-chave: Bleomycin; Histopathology; Lung damage; Ozone exposure.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000400007

Effect of 2 % Chlorhexidine on Dentin Shear Bond Strength of Different Adhesive Systems: A 6 Months Evaluation
Provedor de dados: 77
Autores: Bravo,Cristián; Sampaio,Camila S; Hirata,Ronaldo; Puppin-Rontani,Regina M; Mayoral,Juan Ricardo; Giner,Lluis.
This study evaluated the effect of chlorhexidine dentin treatment on shear bond strength (SBS) of adhesive systems after different storages. The work included 144 third molars that had their dentin exposed and were divided in 6 groups: G1 (ASB+CHX: Adper Scotchbond 1XT + chlorhexidine 2 % prior Primer); G2(ASB); G3 (APP+CHX: Adper Prompt L-Pop + CHX); G4(APP); G5 (SBU+CHX: Single Bond Universal + CHX); and G6(SBU). Resin build-up was performed and teeth were subdivided regarding storage times (n=8): 72 h, 3 and 6 months. Next, SBS test was performed. At 72 hours, all equivalent groups (same adhesive system, different dentin treatment) showed no significant difference in SBS (P.05). Self-etch adhesive groups (with or without CHX) presented lower SBS...
Tipo: Journal article
Palavras-chave: Shear bond strength; Dentin bond strength; Chlorhexidine; Adhesive systems; Adhesion.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300052

Effect of 3-Month Water-Exercise Program on Body Composition in Elderly Women
Provedor de dados: 77
Autores: Ochoa Martínez,Paulina Yesica; Hall López,Javier Arturo; Alarcón Meza,Edgar Ismael; Piña Díaz,Daniel; Estélio Henrique,Martin Dantas.
The aim of this study was to evaluate the effect of a hydrogymnastics training program on Body fat and Fat-free mass in elderly women. The subjects were randomly divided in experimental groups that participated in the hydrogymnastics training program and control group that was not involved in the training and remained sedentary. They were assessed with anthropometric variables in accordance with ISAK protocol in order to determine Body fat (Kg), Fat-free mass (Kg), the training protocol consisted of hydrogymnastics sessions 5 times per week during 12 weeks of intervention, executed in a pool of 1.3 meters divided into three phases: a 10 minute warm-up, 30 minutes of aerobic exercise at 50­60% of maximum heart rate (monitored by heart rate monitor) and a 10...
Tipo: Journal article
Palavras-chave: Physical Activity; Elderly; Body Composition.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400020

Effect of a commercial pectinmethylesterase on tomato paste consistency
Provedor de dados: 69
Autores: Zúñiga-Hansen,María Elvira; Pérez-Torres,Eduardo; Caballero-Valdés,Eduardo; Fernández-Parodi,José.
Background: Consistency is one of the main traits that define commercial quality and price of tomato paste. Pectins are partially responsible for consistency in tomato paste, therefore enzymatic pectin modification could be used to increase paste consistency. Results: This work reports the effects of a commercial enzymatic preparation of pectin-methyl-esterase (PME) (NovoShape™) on tomato paste consistency taking into account variables as enzyme/substrate ratio (0,1% w/w - 1% w/w), reaction time (0 hr - 3 hrs) and reaction temperature (40ºC-60ºC). The results indicate that NovoShape™ increased consistency when reaction temperature ranged from 40 to 50ºC with an enzyme/substrate ratio of 0.5 to 1 (l PME solution/g tomato paste on dry base). On the other...
Tipo: Journal article
Palavras-chave: Pectin methyl esterase; Tomato paste; Viscosity.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300009

Effect of Agricultural Intervention on the Spatial Variability of some Soils Chemical Properties in the Eastern Plains of Colombia
Provedor de dados: 117
Autores: Camacho-Tamayo,Jesús H; Luengas,Carlos A; Leiva,Fabio R.
Growing demand for food exerts pressure on natural resources and may lead to the expansion of agricultural frontiers in developing countries. Most of this pressure appears in tropical zones, in native savannahs, with naturally infertile soils prone to degradation. Crop management in these regions is based on generalized estimates, leaving aside the inherent soil variability, leading to low production efficiency and high risk of environmental damage. This study aims at determining the spatial variability of some chemical properties, including organic carbon, pH, exchangeable acidity, exchangeable aluminum, P, Ca, Mg, K and Na for two Oxisols with different levels of agricultural intervention, in Puerto Lopez, Colombia, in order to identify guidelines for...
Tipo: Journal article
Palavras-chave: Geostatistics; Kriging; Soil management; Precision agriculture; Kriging.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100005

Effect of alternating the magnetic feld on phosphate metabolism in the nervous system of Helix pomatia
Provedor de dados: 48
Autores: Nikolic,Ljiljana M; Rokic,Milos B; Todorovic,Natasa V; Kartelija,Gordana S; Nedeljkovic,Miodrag S; Zakrzewska,Joanna S.
The effect of extremely low frequency magnetic felds (50 Hz, 0.5 mT) - ELF-MF, on phosphate metabolism has been studied in the isolated ganglions of the garden snail Helix pomatia, after 7 and 16 days of snail exposure to ELF-MF. The infuence of ELF-MF on the level of phosphate compounds and intracellular pH was monitored by 31P NMR spectroscopy. Furthermore, the activity of enzymes involved in phosphate turnover, total ATPases, Na+/K+-ATPase and acid phosphatase has been measured. The exposure of snails to the ELF-MF for the period of 7 days shifted intracellular pH toward more alkaline conditions, and increased the activity of investigated enzymes. Prolonged exposure to the ELF-MF for the period of 16 days caused a decrease of PCr and ATP levels and...
Tipo: Journal article
Palavras-chave: ELF-MF; Garden snail; 31P NMR spectroscopy; Phosphate turnover enzymes.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000200012

Effect of Amnion-Wrapped Allogenic Nerve Bridging on Peripheral Nerve Injury
Provedor de dados: 77
Autores: Zhang,Yan-Ru; Zhang,Ge-Chen; Liu,Qiu-Hao; Wang,Yi-Sheng.
This work aims to investigate the effect of fetal amnion-wrapped acellular allogenic nerve transplantation on peripheral nerve injury (PNI) in dogs and to explore its advantages and feasibility in PNI repair. A total of 15 dogs were divided into three groups: the allogenic nerve transplantation (A), amnion-wrapped allogenic nerve transplantation (B), and allogenic nerve donor (C) groups. Neurite counts after myelin and H-E stainings, soleus muscle action potentials, and sciatic nerve conductive velocities were compared between the A and B groups at 16 w after operation. The B group showed better nerve regeneration than the A group at 16 w. Compared with the A group, the B group showed a better growth continuity of the transplanted nerve and milder...
Tipo: Journal article
Palavras-chave: Amnion; Allogenic transplantation; Nerve regeneration.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300034

Effect of an infusion of canelo and bitter lupin on Aegorhinus superciliosus adults
Provedor de dados: 118
Autores: Quintana,Romina; Palma,Alexis; Rebolledo,Ramón; Aguilera,Alfonso.
A. superciliosus (Coleoptera: Curculionidae), known as "cabrito del maitén" (CM) among other names, is an important pest affecting fruit-bearing bushes in southern and central southern Chile. One means of control is the use of organically synthesized insecticides that target the adult, the application of which generally is disadvantageous because these insecticides have long-lasting residual effects and because spraying coincides with flowering and the harvest of the fruit. To complement other pesticides that are more degradable and selective and less harmful to the environment, this work studied the effect of an infusion of canelo buds (Drimys winteri) with leaves and stems of bitter lupin (Lupinus albus) on CM adults. The research evaluated mortality,...
Tipo: Journal article
Palavras-chave: Aegorhinus superciliosus; Aqueous extract; Drimys winteri; Lupinus albus.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300009

Effect of Arbucula Myrrhizal Fungi on an Ecological Crop of Chili Peppers (Capsicum annuum L.)
Provedor de dados: 117
Autores: Castillo R,Claudia ; Sotomayor S,Leonardo ; Ortiz O,César; Leonelli C,Gina; Borie B,Fernando; Rubio H,Rosa.
Mapuche farmers in southern Chile have been cultivating local ecotypes of chili pepper (Capsicum annuum L.), called locally “Cacho de cabra” for many decades. It is used to make “merkén”, a condiment that is consumed locally and exported. This vegetable requires a nursery stage and can obtain nutritional benefits from symbiotic associations such as mycorrhizal fungi, achieving a better adaptation to transplanting. Arbuscular mycorrhizal fungi (AMF) are obligate biotrophes appearing in abundance in agroecosystems with conservation management. The aim of this study was to compare effectiveness of two AMF, a commercial mycorrhizal inoculant (IC, Glomus intraradices) and another native (IN, Glomus claroideum) with a control without inoculation (-I) on the...
Tipo: Journal article
Palavras-chave: Mycorrhiza; Inoculant; Biofertilizers; Fruit quality; Vegetables.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100010

EFFECT OF ARBUSCULAR MYCORRHIZAL FUNGAL INOCULATION ON Eucalyptus globulus SEEDLINGS AND SOME SOIL ENZYME ACTIVITIES UNDER APPLICATION OF SEWAGE SLUDGE AMENDMENT
Provedor de dados: 127
Autores: Arriagada,César; Pacheco,Patricio; Pereira,Guillermo; Machuca,Angela; Alvear,Marysol; Ocampo,Juan Antonio.
The sewage sludge (SS) represents a source of organic matter although its increasing accumulation need a suitable environmental treatment. Our study analyzed the effect of the interaction between sewage sludge (doses 0, 2, 4, 6 and 8 g per 100 g of soil) and Eucalyptus globulus nursery seedlings inoculated with arbuscular mycorrhizal (AM) fungi as a fertilizers alternative and evaluate its effect on some soil enzyme activities. The seedlings were inoculated with Glomus claroideum, Glomus viscosum, Glomus intraradices and Glomus constrictum, establishing a uninoculated control. The sewage sludge application increased the shoot dry weight and the inoculation with G. viscosum was more effective at 6 g of SS in 100 g soil. The root colonization and succinate...
Tipo: Journal article
Palavras-chave: Biological fertilisers; Glomus; Sewage sludge; Soil enzymes; Symbiosis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000200001

Effect of Arbuscular Mycorrhizal Fungi Glomus spp. Inoculation on Alfalfa Growth in Soils with Copper
Provedor de dados: 117
Autores: Novoa M,Daniela; Palma S,Soledad; Gaete O,Hernán.
Soils near mining centers usually have high heavy metal (HM) levels. It has been found that some plants associated with arbuscular mycorrhizal fungi (AMF) improve growth and tolerance to HM in soils. This symbiosis is a biological resource for degraded soil recovery. The objective of this study was to determine the effect of inoculating AMF (Glomus spp.) on alfalfa (Medicago sativa L.) growth in agricultural soils with different copper (Cu) levels for degraded soil recovery. To this effect, alfalfa seeds were grown in soils from the Catemu and Casablanca valleys and inoculated with AMF. Plant height, stem diameter, and number of leaves were measured weekly. Dry matter, mycorrhizal colonization, and Cu concentration in alfalfa plant tissues were measured...
Tipo: Journal article
Palavras-chave: Mycorrhizal colonization; Soil recovery.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200009

Effect of Aspirin on the Developing Teeth of Neonates
Provedor de dados: 77
Autores: Nazir,Shakila; Naqvi,Sayed Naeem-ul-Hasan; Ahmed,Masood; Arain,Abdul Hakeem; Nazir,Naema.
The objective of the present study was to evaluate the effect of aspirin (Acetyl Salicylic Acid) on the developing teeth of the fetus while the mothers were treated through out the pregnancy. Aspirin is a widely used analgesic and antipyretic drug used for symptomatic treatment. However, recent animal studies have indicated a potent teratogenicity of Acetyl Salicylic Acid. Its easy availability without prescription has been associated with high possibility of misuse, especially in the developing world. An experimental control study was carried out where female rabbits being treated with aspirin were taken as mammalian model, and their offspring were used to evaluate the developmental defects in teeth. Quantitative analysis of minerals in three types of the...
Tipo: Journal article
Palavras-chave: Aspirin; Teratogenic effect; Dentition; Female rabbits.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100046

Effect of bokashi and vermicompost leachate on yield and quality of pepper (Capsicum annuum) and onion (Allium cepa) under monoculture and intercropping cultures
Provedor de dados: 118
Autores: Álvarez-Solís,José D; Mendoza-Niñez,José A; León-Martínez,Noe S; Castellanos-Albores,Jorge; Gutiérrez-Miceli,Federico A.
Organic fertilization and crop association are two agroecological management practices that have the potential to optimize land use in horticultural production. The objective of this study was to evaluate the effect of Bokashi and Bokashi amended with Vermicompost Leachate (VL) on the growth, yield and quality of jalapeño pepper (Capsicum annuum L.) and onion (Allium cepa L.) in monoculture and intercropping cultures. This work was conducted under rainfed conditions in the community of Santa Rosa el Oriente, a municipality of Trinity, Chiapas. A randomized complete block design in a split plot arrangement with six treatments and four replicates by treatment was used. Bokashi significantly increased the number of leaves and plant height in onion (37 and...
Tipo: Journal article
Palavras-chave: Bokashi; Capsaicin; Land equivalent ratio; Soluble solids; Vermicompost leachate.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200007

Effect of Bovine Type-I Collagen-Based Films Containing Red Propolis on Dermal Wound Healing in Rodent Model
Provedor de dados: 77
Autores: Albuquerque-Júnior,Ricardo Luiz Cavalcanti de; Barreto,André Luiz Santos; Pires,Jônatas Almeida; Reis,Francisco Prado; Lima,Sônia Oliveira; Ribeiro,Maria Amália Gonzaga; Cardoso,Juliana Cordeiro.
Propolis, an apitherapic product widely employed in natural medicine, presents various biological properties, such as bactericidal and anti-inflammatory activities, but only few reports have looked at the Brazilian red propolis variety. Collagen films have been employed to improve wound healing and some studies have investigated the effect of natural products incorporated into these films. Thus, the aim of this study was to analyze the effect of collagen-based films containing red propolis on wound healing. Therefore, wounds performed in the back of rats were dressed with collagen-based films (G2), and collagen-based films containing red propolis (G3); undressed worked as control (G1). After 3, 7 and 14 days the animals were euthanized, and the wounds were...
Tipo: Journal article
Palavras-chave: Propolis; Wound healing; Occlusive dressings; Type-I collagen.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400025

Effect of Brachionus rubens on the growth characteristics of various species of microalgae
Provedor de dados: 69
Autores: Abou,Reda A.I; Singh,Manjinder; Rivera-Cruz,Anangelica; Power,Grace; Bagby-Moon,Thomas; Das,Keshav.
Background: Cultivation of algae for conversion to biofuels has gained global interest. Outdoor raceway cultivation is preferred because of its lower capital and operating costs. A major disadvantage of outdoor cultivation is susceptibility of algal crops to attack by predatory rotifers. In order to quantify the impact of rotifer attack on different species of algae, we evaluated the growth of eleven microalgal species over a 21-d period after being infected by the predatory rotifer Brachionus rubens. Results: Of the eleven species, Chlorella sorokiniana was the most susceptible with rapid decline in algal growth concomitant with increase in rotifer population growth (3.82/d). In contrast, Synechococcus elongatus andScenedesmus dimorphus were both...
Tipo: Journal article
Palavras-chave: Algae; Biofuels; Biomass; Cyanobacteria; FlowCam; Grazer.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400010

Effect of breed and feeding on the carcass characteristics of the Chilote breed lamb
Provedor de dados: 117
Autores: Ramírez-Retamal,Jorge; Morales,Rodrigo; Martínez,M. Eugenia; de la Barra,Rodrigo.
The Chilote sheep has been developed in an isolated environment, based on grazing lands with low nutritive value belonging to small-scale producers, because of which there is little information about the use of this breed for meat production. The objective of this work was to determine the effects on lamb carcasses of two breeds with different productive purposes and fed on pastures with different nutritional quality. Three groups of lambs were used. The first and second groups were composed of 13 and 11 Chilote lambs respectively, and the third composed of six Suffolk Down lambs. Lambs remained with their mothers, the first group on naturalized pasture and the rest on rangeland. Animals were slaughtered at 90 d of age. Live weight, carcass weight and...
Tipo: Journal article
Palavras-chave: Lambs; Pasture; Carcass quality; Meat yield.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000100007

Effect of bulb weight on the growth and flowering of Herbertia lahue subsp. lahue (Iridaceae)
Provedor de dados: 118
Autores: Morales,Pamela; Schiappacasse,Flavia; Peñailillo,Patricio; Yañez,Paola.
Bulb weight or size is one of the critical factors affecting the vegetative growth and flowering of bulbous species. This study assessed the effect of bulb weight on the growth and flowering of Herbaria lahue subsp. lahue. This bulbous species, commonly known as "lahue," has the potential to be used as an ornamental plant. Lahue bulbs were collected during their dormant period from Tregualemu (Region del Maule), grouped by weight categories and planted in Talca in an unheated polyethylene greenhouse. Phenology data, flowering characteristics and the number of newly formed bulbs were recorded for one season. Plants emerged 2-3 weeks after planting and flowered during the spring, between 8 and 9 months after planting. During fruit set, the leaves began their...
Tipo: Journal article
Palavras-chave: Chilean bulbs; Geophyte; Mediterranean climate.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000200010

EFFECT OF BULK DENSITY ON HYDRAULIC PROPERTIES OF HOMOGENIZED AND STRUCTURED SOILS
Provedor de dados: 127
Autores: Dec,Dorota; Dorner,José; Becker-Fazekas,Orsolya; Horn,Rainer.
In order to determine the effect of bulk density and soil structure on their hydraulic behaviour, undisturbed samples were collected and disturbed samples were prepared from a Luvisol. The experimental field, located in Harste/Goettingen, Germany, was cultivated with sugar beet (Beta vulgaris). The water retention curve (WRC) and saturated hydraulic conductivity (Ks) were measured on undisturbed samples and homogenized samples prepared at different bulk densities (1.2 -1.4 and 1.6 Mg m-3). To determine the effect of soil shrinkage on the unsaturated hydraulic conductivity (k/&amp;#936;) ,the vertical deformation of the repacked samples was measured and relative water content differences (d&amp;#952;)were determined. The hydraulic properties of soils with...
Tipo: Journal article
Palavras-chave: Water retention curve; Soil shrinkage; Soil structure.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000100001

EFFECT OF CADMIUM ON RAT MAXILLARY MOLAR JUNCTIONAL EPITHELIUM DURING LACTATION: EFECTO DEL CADMIO SOBRE EL EPITELIO DE LA ZONA DE UNIÓN MAXILO-MOLAR DE RATAS DURANTE LA LACTANCIA
Provedor de dados: 77
Autores: Ribas,Paulo; Lopes,Ruberval A.; Sala,Miguel A.; Ribas,Lucia M.R.; de Mattos,Maria da Glória C.; Semprini,Marisa; Watanabe,Ii-Sei; Regalo,Simone C.H.
Cadmium in the air, drinking water and food has the potential to affect the health of people, mainly those who live in highly industrialized regions. Cadmium affects placental functions, can cross the placental barrier and directly disturbs fetal development. It is also excreted into milk. The organism is particularly susceptible to cadmium exposure at perinatal period. The effect on rat maxillary molar junctional epithelium a continuous exposure to drinking water containing low level of cadmium during lactation was studied. Female rats received drinking water ad libitum containing 300 mg/l CdCl2 throughout the whole lactation. Control animals received a similar volume of water without cadmium. Lactent rats (21 day-old) were killed by lethal dose of...
Tipo: Journal article
Palavras-chave: Oral mucosae; Junctional epithelium; Cadmium; Lactation; Morphometry; Stereology.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400003

Effect of Californian Red Worm (Eisenia foetida) on the Nutrient Dynamics of a Mixture of Semicomposted Materials
Provedor de dados: 117
Autores: Castillo,Hugo; Hernández,Adriana; Dominguez,David; Ojeda,Damaris.
The efficiency of composting processes with and without the addition of Californian red worms (Eisenia foetida) was evaluated, using manure of dairy cows to generate organic fertilizer. Several parameters were assessed as physio-chemical indicators of maturity, such as temperature, pH, C/N ratio, phytotoxicity and macro and micronutrients at 25 and 54 ws (mature and stored products, respectively). A linear model was used in the statistical analysis, with four replicates that included as fixed effects, the composting systems and time. At 25 wk, both systems reduced the C/N ratio to values of 15.5 in vermicompost and 17.1 in semi-compost. The content of total N, N-NO3, Ca and some micronutrients also increased. K and Na concentrations were higher in the...
Tipo: Journal article
Palavras-chave: Fertilizer; Organic; Maturation; Stability.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300014

Effect of carbamazepine and gabapentin on excitability in the trigeminal subnucleus caudalis of neonatal rats using a voltage-sensitive dye imaging technique
Provedor de dados: 48
Autores: Matsumoto,Akiko; Arisaka,Hirofumi; Hosokawa,Yuki; Sakuraba,Shigeki; Sugita,Takeo; Umezawa,Nobuo; Kaku,Yuki; Yoshida,Kazu-ichi; Kuwana,Shun-ichi.
BACKGROUND: The antiepileptic drugs carbamazepine and gabapentin are effective in treating neuropathic pain and trigeminal neuralgia. In the present study, to analyze the effects of carbamazepine and gabapentin on neuronal excitation in the spinal trigeminal subnucleus caudalis (Sp5c) in the medulla oblongata, we recorded temporal changes in nociceptive afferent activity in the Sp5c of trigeminal nerve-attached brainstem slices of neonatal rats using a voltage-sensitive dye imaging technique. RESULTS: Electrical stimulation of the trigeminal nerve rootlet evoked changes in the fluorescence intensity of dye in the Sp5c. The optical signals were composed of two phases, a fast component with a sharp peak followed by a long-lasting component with a period of...
Tipo: Journal article
Palavras-chave: Carbamazepine; Gabapentin; Rat brainstem; Spinal trigeminal nucleus; Voltage-sensitive dye imaging.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100036

Effect of Chilean propolis on cariogenic bacteria Lactobacillus fermentum
Provedor de dados: 118
Autores: Saavedra,Nicolás; Barrientos,Leticia; Herrera,Christian L; Alvear,Marysol; Montenegro,Gloria; Salazar,Luis A.
Dental caries is an infectious disease of worldwide public health concern. Among the bacteria involved in this pathology are Streptococcus mutans, Streptococcus sobrinus and organisms belonging to the genera Actinomyces and Lactobacillus. The pharmaceutical industry is focussing on the discovery of new antibacterial products after a greater resistance to those already known. Propolis has been used since ancient times, so their effects against various microorganisms have been already investigated. In our study, we evaluated the antimicrobial effect of 6 commercial ethanolic propolis extracts on the bacterium Lactobacillus fermentum. This bacterium was isolated after its identification by Polymerase Chain Reaction using species specific primers, and after...
Tipo: Journal article
Palavras-chave: Lactobacillus fermentum; Dental caries; Propolis; Antibacterial activity.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100011

Effect of chlorocholine chlorid on phenolic acids accumulation and polyphenols formation of buckwheat plants
Provedor de dados: 48
Autores: Sytar,Oksana; Borankulova,Asel; Hemmerich,Irene; Rauh,Cornelia; Smetanska,Iryna.
BACKGROUND: Effect of chlorocholine chloride (CCC) on phenolic acids composition and polyphenols accumulation in various anatomical parts (stems, leaves and inflorescences) of common buckwheat (Fagopyrum esculentum Moench) in the early stages of vegetation period were surveyed. RESULTS: Treatment of buckwheat seeds with 2% of CCC has been increased content of total phenolics in the stems, leaves and inflorescences. On analyzing the different parts of buckwheat plants, 9 different phenolic acids - vanilic acid, ferulic acid, trans-ferulic acid, chlorogenic acid, salycilic acid, cinamic acid, p-coumaric acid, p-anisic acid, methoxycinamic acid and catechins were identified. The levels of identified phenolic acids varied not only significantly among the plant...
Tipo: Journal article
Palavras-chave: Chlorocholine chloride; Phenolic acids; Catechins; Buckwheat.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100019

Effect of Cigarette Smoking on the Structure of Hepatocytes: TEM Study
Provedor de dados: 77
Autores: Battah,Khairat A; Badran,Darwish H; Shraideh,Ziad A.
The liver is one of the major organs that is indirectly affected by cigarette smoke. The aim of this project is to define the histologic and ultrastructural changes in normal liver cells after exposing animals to cigarette smoke. Thirty albino rats were exposed to cigarette smoke for 90 days, followed by morphologic examination of their livers under light microscope and electron microscope. The liver cells of cigarette smoke exposed rats showed mild swelling with increased eosinophilia. Ultrastructural examination of these cells demonstrated cytoplasm with highly proliferated and crowded mitochondria. There were many electron dense mitochondria. These mitochondria were pleomorphic in shape compared to mitochondrias of control rats. Also, loss of...
Tipo: Journal article
Palavras-chave: Liver; Smoking; Mitochondria; Ultrastructure.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400011

Effect of Citrus aurantium L. Essential Oil on Muscle Regeneration in Mdx Mice
Provedor de dados: 77
Autores: De Souza,Paula Aiello Tomé; Marques,Maria Júlia; Lima,Clélia Akiko Hiruma; Matheus,Selma Maria Michelin.
Duchenne muscular dystrophy (DMD) is a severe X-linked recessive disorder characterized by the progressive loss of muscular strength. Mdx mutant mice show a marked deficiency in dystrophin, which was related to muscle membrane stability. The aim of this study was to verify the possible protective anti-inflammatory effect of citrus oil on mdx muscle fibers. Thus, adult male and female mdx mice (014/06-CEEA) were divided into control and citrus-treated. After 60 days of treatment, one ml of blood was collected for creatine kinase (CK) test. Diaphragm, sternomastoideus, anterior tibial and gastrocnemius muscles were removed and processed according to histological routine methods. The observed alterations indicate a direct effect of citrus. Recent studies have...
Tipo: Journal article
Palavras-chave: Muscle fiber; Duchenne muscular dystrophy; Citrus aurantium L; Mdx mouse; Muscle regeneration; Central nuclei; Creatine kinase.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400048

Effect of Compost Application on Some Properties of a Volcanic Soil from Central South Chile
Provedor de dados: 117
Autores: Valarini,Pedro José; Curaqueo,Gustavo; Seguel,Alex; Manzano,Karina; Rubio,Rosa; Cornejo,Pablo; Borie,Fernando.
Soil compost application is a common soil management practice used by small farmers of Central-South Chile that produces positive effects on soil properties and also promotes presence and activity of arbuscular mycorrhizal fungi (AMF). This fungi form symbiosis with plant roots improving plant nutrition, as well as producing glomalin, a glycoprotein that has been associated with soil aggregation stability. Therefore, the aim of this study was to evaluate, in an Ultisol from Central-South Chile, the effect of different doses of compost on some soil characteristics at the end of the third year of a crop sequence including wheat (Triticum aestivum L.), bean (Phaseolus vulgaris L.), and grassland (Lolium multiflorum Lam. associated with Trifolium repens L.)....
Tipo: Journal article
Palavras-chave: Compost; Glomalin; Soil aggregation; Ultisol.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300015

Effect of crocus sativus on gentamicin induced nephrotoxicity
Provedor de dados: 48
Autores: AJAMI,MARJAN; EGHTESADI,SHAHRIAR; PAZOKI-TOROUDI,HAMIDREZA; HABIBEY,ROUHOLLAH; EBRAHIMI,SOLTAN AHMED.
Crocus sativus, known as saffron, is used in folk medicine for treatment of different types of diseases, and its anti-inflammatory and free radical scavenging activities have been demonstrated. The present study evaluated gentamicin nephrotoxicity in saffron treated rats. Male Wistar rats (200-250g) were treated with saffron (40 or 80 mg/k/d) for 10 days, or saffron (40 or 80 mg/ kg/d) for 10 days and gentamicin 80 mg/kg/d for five days, starting from day 6. At the end of treatment, blood samples were taken for measurement of serum creatinine (SCr) and BUN. The left kidney was prepared for histological evaluation and the right kidney for Malondialdehyde (MDA) measurement. Gentamicin 80 (mg/k/d) increased SCr, BUN and renal tissue levels of MDA and induced...
Tipo: Journal article
Palavras-chave: Saffron; Malondialdehyde (MDA); Aminoglycoside; Renal failure.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000100010

Effect of crop load on the phenological, vegetative and reproductive behavior of the ‘Frantoio’ olive tree (Olea europaea L.)
Provedor de dados: 118
Autores: Beyá-Marshall,Víctor; Fichet,Thomas.
The aim of this study was to characterize the phenological, vegetative and reproductive behavior variables of ‘Frantoio’ olive trees in an "off’ year (with a low crop load) and an "on" year (with a high crop load). To do this, during the 2011-2012 and 2012-2013 seasons, "off" and "on", respectively, phenological variables, plant growth (shoots and roots) and reproductive growth (type of flower, fruit set and growth), were monitored biweekly. In addition, the yield per tree was assessed, and the crop load was estimated. The main results showed that crop load strongly influenced these variables. The distribution and intensity of vegetative growth, both in the roots and aboveground, decreased more and had lower intensity in the high fruiting season, with a...
Tipo: Journal article
Palavras-chave: Alternate bearing; Flowering; Rhizotron; Root growth dynamics; Shoots; Source-sink.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100005

Effect of cryopreservation on the efficiency of exogenous gene, genetic transformation and expression level of Arabidopsis thaliana
Provedor de dados: 69
Autores: Li,Zhongai; Du,Yaqiong; Wang,Zicheng.
Background: Cryopreservation refers to the storage of a living organism at ultra-low-temperature for long-term preservation of plant germplasm. The effect of cryopreservation on the efficiency of exogenous gene genetic transformation and expression level were studied herein. In this work, transgenic Arabidopsis thaliana were successfully conserved in vitro by cryopreservation methods. Results: The effects of osmotic stress due to cryoprotectants during pretreatment and of storage at -196ºC on the stability, the efficiency of genetic transformation and the expression level of exogenous gene were analyzed in Arabidopsis. The results showed that there had not any significant increasing in the efficiency of genetic transformation after cryopreservation, and...
Tipo: Journal article
Palavras-chave: Arabidopsis thaliana; Cryopreservation; Real-time PCR; Transformation efficiency.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600012

Effect of culture medium and incubation on the characteristics of micropropagated agave plants
Provedor de dados: 118
Autores: Enríquez-del Valle,José R; Antonio-Luis,Karla H; Rodríguez-Ortiz,Gerardo; Campos-Ángeles,Gisela V.
Agave potatorum Zucc adventitious shoots were obtained in vitro from stem tissues and rooted in different solid media, pH 5.8, containing the following: 1) different concentrations (50, 75, and 100%) of MS (Murashige and Skoog) mineral salts and 2) different quantities of indole-3-butyric acid (IBA) (0, 0.5, 1 mg L-1). The shoots in each medium were separated into two groups and incubated for 84 days under different environments, including a laboratory or greenhouse. The experimental design was completely randomized with a 3×3×2 factorial arrangement. Adventitious roots emerged after 10 to 14 days of incubation, depending on the condition of incubation. In both laboratory and greenhouse settings, after 28 days of incubation, 66.6 and 93.6% of shoots...
Tipo: Journal article
Palavras-chave: Fluorescent lighting; Incubation environment; Indole butyric acid; Mineral salts; Solar radiation.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200009

Effect of Culture Medium in Callogenesis from Adult Walnut Leaves (Juglans regia L.)
Provedor de dados: 117
Autores: Avilés,Fabiola; Ríos,Darcy; González,Ricardo; Sánchez-Olate,Manuel.
To define preliminary aspects of walnut (Juglans regia L.) callogenesis in indirect propagation systems, this work analyzed callogenic induction in adult leaves of walnut in broadleaf trees (BTM), Murashige and Skoog (MS) Driver Kuniyuki Walnut (DKW) and Woody Plant (WPM) media. Leaf segments of 1 cm², previously sterilized, were placed in each culture medium, supplemented with 21.4 µM naphtalene acetic acid (NAA) and 8.8 µM 6-benzylaminopurine (BAP). A completely random design was used; the experimental unit was a Petri dish with six callus explants. Each treatment was composed of seven Petri dishes. Callogenesis (%), nodular calli (%) and histology of calli explants were evaluated at 4 weeks by staining 10 µm slices with safranine-fastgreen. There were...
Tipo: Journal article
Palavras-chave: Auxins; Citoquinines; Walnut; Callus; Leaves.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300020

Effect of cytokinin types, concentrations and their interactions on in vitro shoot regeneration of Chlorophytum borivilianum Sant. &amp;amp; Fernandez
Provedor de dados: 69
Autores: Ashraf,Mehdi Farshad; Aziz,Maheran Abd; Kemat,Nurashikin; Ismail,Ismanizan.
Background Chlorophytum borivilianum is a rare medicinal plant originally distributed throughout the forest of India. The tubers of C. borivilianum are used as an aphrodisiac and impotence supplement. The propagation of C. borivilianum is possible through seeds and tubers, but conventional methods may take several months. Hence in vitro technique of shoot regeneration could be an efficient alternative means of propagating the species. Latest study reported microtuberization of C. borivilianum but there is no sufficient study on a rapid method for shoot multiplication and elongation. Results Young shoot buds of C. borivilianum were cultured on MS medium containing 6-benzylaminopurine (BAP) and Kinetin (Kn), both at 0, 8.88, 17.8 and 26.6 µM, either...
Tipo: Journal article
Palavras-chave: Chlorophytum borivilianum; Cytokinin interaction; Shoot multiplication.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600004