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A cell junction pathology of neural stem cells leads to abnormal neurogenesis and hydrocephalus Biol. Res.
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
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A characterization of Chilean farmers based on their market-production orientation Ciencia e Investigación Agraria
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
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A Classic Case of Annular Pancreas and its Clinical Implications International Journal of Morphology
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
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A Common 34C>G Variant at the Peroxisome Proliferator-Activated Receptor γ2- Gene in Chilean Women with Polycystic Ovary Syndrome and Controls International Journal of Morphology
Guzmán,Neftalí; Erices,Leonardo; Valdés,Patricio; Salazar,Luis A.
The 34C>G (Prol2Ala) polymorphic variant of the peroxisome proliferator-activated receptor-γ2 (PPAR-γ2) 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>G polymorphism at the PPAR-γ2 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>G variant in the PPAR-γ2 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
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A Communicating Branch between the Dorsal and Superficial Ramus of the Ulnar Nerve (Kaplan's Anastomosis): Clinical and Surgery Discussion International Journal of Morphology
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
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A COMMUNITY ANALYSIS OF THE SOFT BOTTOM MEGAFAUNA (CRUSTACEA, MOLLUSCA) FROM THE SOUTHWESTERN REGION OF SANTA MARTA, COLOMBIAN CARIBBEAN Boletín de Investigaciones
Arango,Claudia P.; Solano,Oscar D..
Soft bottom megabenthic communities have been poorly studied in the Caribbean Sea. In this study we describe the structure and species composition of a Crustacea-Mollusca megafaunal community based on beam trawl samples taken between 13 and 60 m depth at the southwestern region of Santa Marta, Colombian Caribbean. Classification and ordination analyses using abundance data of crustaceans and molluscs produced two main groups (A and C), which seem to be controlled by depth and sediment characteristics. Group A consisted of species collected at the deeper stations and high content of silts (between 30 and 60 m depth) and exhibited the highest density and biomass mean values. The decapod Chasmocarcinus cilindricus was found as the characteristic species for...
Tipo: Journal article Palavras-chave: Megafauna; Soft bottoms; Communities; Caribbean; Colombia.
Ano: 1999 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97611999000100008
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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 International Journal of Morphology
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
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A Comparative Analysis of the Morphological Characteristics of Elite Karatekas, Judokas, Taekwondoists, Boxers and Wrestlers International Journal of Morphology
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
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A COMPARATIVE ANATOMICAL STUDY OF THE STEMS OF CLIMBING PLANTS FROM THE FOREST REMNANTS OF MARINGA, BRAZIL Gayana Botánica
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
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A comparative cost analysis for using compost derived from anaerobic digestion as a peat substitute in a commercial plant nursery Ciencia e Investigación Agraria
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
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A Comparative Histological Study of the Tongue of Rat (Rattus Norvegicus), Bat (Eidolon Helvum) and Pangolin (Manis Tricuspis) International Journal of Morphology
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
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A Comparative Histomorphometric Study of the Stomach of Rat (Rattus norvegicus), Bat (Eidolon helvum) and Pangolin (Manis tricuspis) in Relation to Diet International Journal of Morphology
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<0.05) with the exception of the diameter of the zymogenic cells in pangolin which was not statistically significant (p>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
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A comparative proteomic study of white and black glutinous rice leaves Electron. J. Biotechnol.
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
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A Comparative Study of Fixatives for Axolotl Blastema Tissue International Journal of Morphology
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
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A Comparative Study of the Ileum in Rat (Rattus norvegicus), Bat (Eidolon helvum) and Pangolin (Manis tricuspis) as Investigated Using Histological Method International Journal of Morphology
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; 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
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A Comparative Study of Variation of the Pterion of Human Skulls from 13th and 20th Century Anatolia International Journal of Morphology
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
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A Comparison of Anatomical Measurements of the Infraorbital Foramen of Skulls of the Modern and Late Byzantine Periods and the Golden Ratio International Journal of Morphology
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
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A comparison of farmland value determinants in Chile between 1978-1998 and 1999-2008 Ciencia e Investigación Agraria
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
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A comparison of methods employed to evaluate antioxidant capabilities Biol. Res.
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
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A COMPARISON OF OCEANIC CIRCULATION IN THE NORTH PACIFIC FORCED BY SCATEROMETER AND REANALYSIS WINDS Gayana
Yuan,Xiaojun; Curchitser,Enrique.
Tipo: Journal article
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300055
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