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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

Expression of the antibody 14D9 in Nicotiana tabacum hairy roots
Provedor de dados: 69
Autores: Martínez,Carolina; Petruccelli,Silvana; Giulietti,Ana María; Alvarez,María Alejandra.
Nicotiana tabacum hairy roots that express the antibody 14D9 were established. The 14D9 antibody yield obtained after 20 days of culture was 5.95 &amp;#956;g 14D9ml-1. The addition of the reticulum endoplasmic retention sequence KDEL demonstrated a positive effect over the intracellular 14D9 amounts with a yield increase up to 20.82 µg ml-1. DMSO increased the antibody amount in the biomass from 20.00 to 64.03 µg ml-1 while PVP (at 1.5 gl-1) and gelatine (at 5.0 gl-1) increased total 14D9 amounts in the culture medium to 25 µg and 14 µg respectively
Tipo: Journal article
Palavras-chave: Catalytic antibodies; In vitro cultures; Molecular farming; Recombinant antibodies; Tobacco.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200006

Recombinant expression and refolding of the c-type lysozyme from Spodoptera litura in E. coli
Provedor de dados: 69
Autores: Kim,Jong-Wan; Yoe,Jeehyun; Lee,Gil Ho; Yoe,Sung Moon.
The chicken-type lysozyme of the insect Spodoptera litura (SLLyz) is a polypeptide of 121 amino acids containing four disulfide bridges and 17 rare codons and participates in innate defense as an anti-bacterial enzyme. The recombinant S. litura lysozyme (rSLLyz) expressed as a C-terminal fusion protein with glutathione S-transferase (GST) in Rosetta(DE3) Singles. The protein was produced as an inclusion body which was solubilized in 8 M urea, renatured by on-column refolding, and purified by reversed-phase chromatography to 95% purity. The purified rSLLyz demonstrated antibacterial activity against B. megaterium confirmed by inhibition zone assay. The overexpression and refolding strategy described in this study will provide a reliable technique for...
Tipo: Journal article
Palavras-chave: Antibacterial activity; Inclusion body; Lysozyme; On-column refolding; Recombinant expression; Spodoptera litura.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300006

Plant genomics and agriculture: From model organisms to crops, the role of data mining for gene discovery
Provedor de dados: 69
Autores: Mahalakshmi,Viswanathan; Ortiz,Rodomiro.
Sequencing and analysing of the Arabidopsis thaliana genome, the first plant kingdom genome to be unraveled, will always remain a scientific landmark. International initiatives to sequence rice, the most important cereal in Asia, are underway. However as functional information piles up in Arabidopsis and rice, researchers working in other crops will benefit from this new knowledge and apply it to their studied plants or crop species. The increasing role of public databases of model organisms and bio-informatics in data mining, presents a new opportunity as well as a challenge to researchers to develop more focused molecular tools for gene discovery and deployment. The work presented in here describes how such an approach has benefited sorghum, a rainfed...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300012

Teaching the principles of biotechnology transfer: A service-learning approach
Provedor de dados: 69
Autores: Montgomery,Beronda L.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100004

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

Efficiency of improved RAPD and ISSR markers in assessing genetic diversity and relationships in Angelica sinensis (Oliv.) Diels varieties of China
Provedor de dados: 69
Autores: Mei,Zhiqiang; Zhang,Chun; Khan,Asaduzzaman; Zhu,Ye; Tania,Mousumi; Luo,Peiyi; Fu,Junjiang.
Background Angelica sinensis is a well-known traditional Chinese medicinal plant. We aimed to assess the genetic diversity and relationships in A. sinensis cultivars collected from different locations of China and also some other Angelica species. Results We employed an improved random amplified polymorphic DNA (RAPD) technique for the amplification of DNA materials from ten Angelica cultivars, and the results were verified by inter-simple sequence repeat (ISSR) analysis. Twenty six RAPD primers were used for RAPD, and the amplified bands were found highly polymorphic (96%). Each primer amplified 8-14 bands with an average of 10.25. The cluster dendrogram showed that the similarity coefficients ranged from 0.41 to 0.92. The similarity coefficients were...
Tipo: Journal article
Palavras-chave: Angelica sinensis; Genetic authentication; Inter-simple sequence repeat; Random amplified polymorphic DNA; Substitutes.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200006

Enzymatic synthesis of short chain citronellyl esters by a new lipase from Rhizopus sp
Provedor de dados: 69
Autores: Alves Macedo,Gabriela; Soberón Lozano,Maria Mercedez; Pastore,Gláucia Maria.
Short chain citronellyl esters were synthesized by a new microbial lipase from Rhizopus sp strain isolated and lipase produced at UNICAMP, Brazil. Direct esterification and transesterification reactions have been performed to produce citronellyl acetate and butyrate in a free-solvent system and with n-hexane in reaction medium. Reaction mixture for direct esterification and transesterification was carried out at 45ºC in equimolar concentration of substrates: acid or ester and alcohol. Only citronellyl butyrate was synthesized by direct esterification with yields from 95 to 100% after 24 hrs. of reaction time, with or without n-hexane. Citronellyl acetate was synthesized by transesterification with ethyl acetate and cytronellol, with yield of 58% after 48...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100009

Immobilized lysozyme protein on fibrous medium: Preliminary results for microfiltration applications
Provedor de dados: 69
Autores: Assis,Odilio B. G.; Claro,Luis C.
The protein lysozyme was deposited onto a permeable support comprising chemically functionalized glass fiber. The main objective of this study was to set a stable organic net with no effect on the medium bed permeability and a preliminary test the activity of this enzyme under immobilized conditions. The film formation is followed by atomic force microscopy (AFM) surface imaging. The effect on the bacteria Escherichia coli was tested using a simple microfiltration column. The filtration results pointed around 75% removal of bacteria in the effluent when compared to the influent concentration. The removal mechanism is assumed as being essentially due biointeraction. The surface polarity characteristics of the formed film were also considered as playing an...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200010

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

NBBnet - The National Biotechnology and Bioinformatics Network: A Malaysian initiative towards a national infrastructure for bioinformatics
Provedor de dados: 69
Autores: Raih,Mohd Firdaus; Harmin,Sharr Azni; Ahmad,Hafiza Aida; Mat Isa,Mohd Noor; Mahadi,Nor Muhammad; Ibrahim,Abdul Latif; Mohamed,Rahmah.
Bioinformatics is a necessary technology and tool, which current molecular biologists cannot do without in light of the genome data explosion and advent of fields such as genomics and proteomics. Yet, even with this in mind, there is still a limited pool of human resource to support and develop bioinformatics particularly in poorer developing nations. The highly multidisciplinary nature of this field can be an obstacle in converting just any molecular biologist into a proficient and capable bioinformaticist. Coupled with the high costs of software, hardware, technical maintenance and systems support; many developing and poor countries may not be able to fully realize their biotech potential either academically or economically due to the inability to fully...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100003

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

Lipase-catalyzed enantioselective esterification of flurbiprofen with n-butanol
Provedor de dados: 69
Autores: Bhandarkar,Satej V.; Neau,Steven H.
The influences of water activity and solvent hydrophobicity on the kinetics of the lipase-catalyzed enantioselective esterification of flurbiprofen with n-butanol were investigated. The solvent effect was not similar for lipases from Candida rugosa (Crl), Mucor javanicus (Mjl), and porcine pancreas (Ppl). The lipase-catalyzed reaction rates in different solvents across a wide range of water activities revealed that the Ppl-catalyzed reaction exhibited no enantioselectivity and no substantial water activity or solvent dependence. The Mjl-catalyzed reaction proceeded faster, preferring the R-enantiomer reaction over that of its antipode, but had little solvent or water activity dependence. The Crl-catalyzed reactions in n-heptane and n-nonane had similar...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000300003

Response surface methodology used for statistical optimization of jiean-peptide production by Bacillus subtilis cells adsorbed on wood chips
Provedor de dados: 69
Autores: Zhang,Xiaoyong; Zhou,Jinyan; Fu,Wen; Li,Zhidong; Zhong,Juan; Yang,Jie; Xiao,Liang; Tan,Hong.
Response surface methodology (RSM) was used for statistical optimization of jiean-peptide (JAA) production by Bacillus subtilis ZK8 cells adsorbed on wood chips to form a novel fermentation system. The Plackett-Burman design was used in the first step to evaluate the effects of eight factors, including six fermentation medium components and two cell adsorption conditions. Among the variables screened, soybean meal hydrolysate (SMH) and MgSO4·7H2O in the fermentation medium had significanteffects on JAA production. In the second step, the concentrations of SMH and MgSO4·7H2O were further optimized using central composite designs and response surface analysis. The optimized concentration of SMH and MgSO4·7H2O was 24% (v/v) and 0.38% (w/v), respectively,...
Tipo: Journal article
Palavras-chave: Bacillus subtilis ZK8; Cell adsorption; Jiean- peptide; Response surface methodology; Wood chips.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400006

Improved sanitary landfill design using recirculation of anaerobically treated leachates: generation of advanced design criteria
Provedor de dados: 69
Autores: Schiappacasse,MarÃ­a Cristina; Palma,Juan; Poirrier,Paola; Ruiz-Filippi,Gonzalo; Chamy,Rolando.
In Latin Americ a, the most accepted disposal systems for Municipal Solid Waste (MSW) are landfills, which nowadays have low rates of stabilization. The objective of this study was to develop design criteria for sanitary landfills which lead to a reduction in the stabilization times of MSW, based on experiment results obtain from a pre-pilot scale operation of two sanitary landfills (0.5 Ton), one with recirculation of leachates treated in an anaerobic digester and the other with recirculation of untreated leachates. This was complemented by another pilot scale sanitary landfill (1440 Ton) with recirculation of leaches treated in an anaerobic filter, and additionally by a computer simulation of leachate generation through the water balance of a theoretical...
Tipo: Journal article
Palavras-chave: Hydrological balance; Landfill; Leachate recycle; Municipal solid waste; Stabilization.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300009

Overexpression of a cysteine proteinase inhibitor gene from Jatropha curcas confers enhanced tolerance to salinity stress
Provedor de dados: 69
Autores: Li,Rui; Wang,Wanjun; Wang,Wenguo; Li,Fosheng; Wang,Qingwei; Xu,Ying; Wang,Shenghua.
Background Cysteine proteinase inhibitor (cystatin, CPI) is one of the most important molecules involved in plant development and defense, especially in the regulation of stress responses. However, it is still unclear whether the Jatropha curcas CPI (JcCPI) gene functions in salinity response and tolerance. In this study, the sequence of the JcCPI gene, its expression pattern, and the effects of overexpression in Escherichia coli and Nicotiana benthamiana were examined. The purpose of this study was to evaluate the regulatory role of JcCPI in salinity stress tolerance. Results The CPI gene, designated JcCPI, was cloned from J. curcas; its sequence shared conserved domains with other plant cystatins. Based on a transcription pattern analysis, JcCPI was...
Tipo: Journal article
Palavras-chave: Cysteine proteinase inhibitor; Jatropha curcas; Salinity stress.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500008

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

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

Valorization of raw glycerol for citric acid production by Yarrowia lipolytica yeast
Provedor de dados: 69
Autores: Rywinska,Anita; Rymowicz,Waldemar; Marcinkiewicz,Marta.
In the present report, citric acid production from raw glycerol in two fed-batch systems by acetate negative-mutants of Yarrowia lipolytica: Wratislavia 1.31 and Wratislavia AWG7 was compared. In the system, in which the total glycerol concentration was 200 g&amp;#8729;L-1, the substrate was added by pulsed additions, and in the other, in which the total glycerol concentration was 300 g&amp;#8729;L-1, the substrate was added at a constant feeding rate of 1.4 g&amp;#8729;h-1. Despite high citric acid concentrations (155.2 and 157.5 g&amp;#8729;L-1 with Y. lipolytica Wratislavia 1.31 and Y. lipolytica Wratislavia AWG7, respectively) obtained from 300 g&amp;#8729;L-1 of glycerol, the yield of citric acid was similar, i.e. about 0.6 g&amp;#8729;g-1. The...
Tipo: Journal article
Palavras-chave: Citric acid; Fed-batch culture; Yarrowia lipolytica; Raw glycerol.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400009

Influence of metal ions and organic carbons on denitrification activity of the halotolerant bacterium, Paracoccus pantotrophus P16 a strain from shrimp pond
Provedor de dados: 69
Autores: Pintathong,Punyawatt; Richardson,David J; Spiro,Stephen; Choorit,Wanna.
The effect of metal ions, ferric ion (Fe3+) and molybdenum ion (Mo6+) on the denitrification process of Paracoccus pantotrophus P16 grown under saline conditions was investigated. Results revealed that the dosages of added Fe3+ and Mo6+ significantly accelerated nitrate utilization and nitrite accumulation. Enzymatic studies revealed that the membrane-bound nitrate reductase and the periplasmic nitrite reductase had activities of 998 ± 28 and 373 ± 18 nmol (mg protein)-1 min-1, respectively after growing Paracoccus pantotrophus P16 in medium supplemented with 1.5 µM Fe3+. If provided with 1.5 µM Fe3+and 2.4 µM Mo6+, the membrane-bound nitrate reductase activity increased to 6,223 ± 502 nmol (mg protein)-1 min-1 and the periplasmic nitrite reductase was 344...
Tipo: Journal article
Palavras-chave: Metal ions; Nitrate reductase; Nitrite accumulation; Nitrite reductase; Paracoccus pantotrophus.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200004

Molecular description and similarity relationships among native germplasm potatoes (Solanum tuberosum ssp. tuberosum L.) using morphological data and AFLP markers
Provedor de dados: 69
Autores: Solano Solis,Jaime; Morales Ulloa,Daniza; Anabalón Rodríguez,Leonardo.
Chile is considered to be a sub-center of origin for the cultivated potato, with native and introduced genetic material coexisting in the country. Thus, the different varieties present in Chiloe Island are characterized by a rich diversity of forms, sizes, colours and phenological characteristics. In the present work, the level of polymorphism and the genetic relationship were studied by means of molecular markers using the amplified fragment length polymorphism (AFLP) technique and twenty-seven morphological characters. Twenty varieties of potatoes from the Chiloe Island were analyzed. The commercial variety Desirée and one specie from the Etuberosa series, Solanum fernandezianum, collected in the Juan Fernandez Island were included as controls. A...
Tipo: Journal article
Palavras-chave: Cluster analysis; Molecular markers; Solanum tuberosum ssp. tuberosum.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300011

Immature embryo: A useful tool for oil palm (Elaeis guineensis Jacq.) genetic transformation studies
Provedor de dados: 69
Autores: Abdullah,Ruslan; Zainal,Alizah; Yew Heng,Wee; Chui Li,Leaw; Chee Beng,Yeap; Mei Phing,Lee; Abdullah Sirajuddin,Salwa; Soo Ping,Winnie Yap; Lourdes Joseph,Juanita; Azma Jusoh,Siti.
Oil palm (Elaeis guineensis Jacq.) is the highest yielding oil-bearing crop. However, being a perennial crop, genetic improvement of oil palm is extremely slow. Indeed, compared to other annual oil crops such as soybean and rapeseed, genetic manipulations remained less important. Therefore, to remain competitive, oil palm growers and breeders need new and novel approaches. In this report, the potential of immature embryos (IE) as a useful tool for oil palm genetic transformation studies was evaluated. It was evident that IEs were amenable to both direct and Agrobacterium-mediated gene transfer. Due to the abundant supply of IE, optimization of biolistic and Agrobacterium-mediated gene transfer into IEs were easily carried out. Transient transformation...
Tipo: Journal article
Palavras-chave: Genetic transformation studies; Immature embryos; In vitro culture; Oil palm; Plant regeneration.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100006

The upstream sequence of the phycocyanin b subunit gene from Arthrospira platensis regulates expression of gfp gene in response to light intensity
Provedor de dados: 69
Autores: Yongzhong,Lu; Zhang,Xuecheng.
In cyanobacteria, few details are known of the mechanisms through which the expression of the light-harvesting pigment c-phycocyanin is regulated. In the present study, a 419 bp upstream sequence of the phycocyanin b subunit (cpcB) gene from Arthrospira platensis FACHB341 was fused with green fluorescent protein (gfp) gene, and a heterologous reporting system was built up to investigate the influence of light intensity on the expression of gfp gene, and the regulation function of different region of the upstream sequence of cpcB gene. Results showed that the upstream sequence of cpcB gene could drive the expression of gfp gene in Synechococcus sp. strain PCC7942, and the expression was influenced by light intensity, the lower the light intensity, the...
Tipo: Journal article
Palavras-chave: CpcB gene; Deletion analysis; Light intensity; Synechococcus; Transformation.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100010

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

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

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

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

Lettuce (Lactuca sativa L.) seed quality evaluation using seed physical attributes, saturated salt accelerated aging and the seed vigour imaging system
Provedor de dados: 69
Autores: Peñaloza,Patricia; Ramirez-Rosales,Gerardo; McDonald,Miller B; Bennett,Mark A.
High seed quality is essential for optimum stand establishment in lettuce. As a result, it is necessary to have seed vigour tests that permit rapid, objective and accurate evaluation of seed quality. This study evaluated physical and physiological seed quality components of four seed lots of six lettuce varieties obtained from a commercial company. Seeds were evaluated for seedling emergence under greenhouse conditions, standard germination, seed physical aspects, the Saturated Salt Accelerated Aging (SSAA) test and the Seed Vigour Imaging System (SVIS). Results indicated that large-seeded lettuce varieties had higher percentage germination, higher SSAA values, higher SVIS index and more rapid and uniform greenhouse emergence. Black-seeded lettuce...
Tipo: Journal article
Palavras-chave: Vegetables; Deterioration; Seedling; Performance.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300010

Natural antifouling compound production by microbes associated with marine macroorganisms: A review
Provedor de dados: 69
Autores: Satheesh,Sathianeson; Ba-akdah,Mohammad Abdulaziz; Al-Sofyani,Abdulmohsin A.
In the marine environment, all hard surfaces including marine macroorganims are colonized by microorganisms mainly from the surrounding environment. The microorganisms associated with marine macroorganisms offer tremendous potential for exploitation of bioactive metabolites. Biofouling is a continuous problem in marine sectors which needs huge economy for control and cleaning processes. Biotechnological way for searching natural product antifouling compounds gained momentum in recent years because of the environmental pollution associated with the use of toxic chemicals to control biofouling. While, natural product based antifoulants from marine organisms particularly sponges and corals attained significance due to their activities in field assays,...
Tipo: Journal article
Palavras-chave: Antifouling; Biofouling; Bioactive compounds; Marine biotechnology; Marine microbes.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300012

Toxicity caused by para-substituted phenols on Tetrahymena pyriformis: The structure-activity relationships
Provedor de dados: 69
Autores: Jäntschi,Lorentz; Popescu,Violeta; Bolboaca,Sorana D.
The toxicity of thirty para-substituted phenols on Tetrahymena pyriformis was modelled using an original methodology that uses the complex structural information of the compounds. Two models were built. The methodology allows atomic properties to be assigned to toxicity based on the selection of pairs of descriptors from the entire family, which is called Molecular Descriptors Family (MDF). One model has two independent structural descriptors and the other has four. The model with four descriptors proved to have high estimated and predictive abilities (over 97% of toxicity could be explained by structural information). The partial charge distribution by bonds (molecular topology) and space (molecular geometry) interaction proved to be related with the...
Tipo: Journal article
Palavras-chave: Para-substituted phenol derivatives; Structure-activity relationships; Tetrahymena pyriformis; Toxicity.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300012

Stimulation of trans-resveratrol biosynthesis in Vitis vinifera cv. Kyoho cell suspension cultures by 2, 3-dihydroxypropyl jasmonate elicitation
Provedor de dados: 69
Autores: Shen,Xu; Du,Qingshan; Xu,Yufang; Lu,Yanhua.
Background: Plant cell suspension culture of Vitis vinifera is a promising technology for investigating different factors that are able to induce and/or modify stilbenes biosynthesis. Jasmonates have been reported to play an important role in a signal transduction pathway that regulates defence responses as well as the production of secondary metabolites. In this study, 2, 3-dihydroxypropyl jasmonate (DHPJA) was used to investigate its effect on stimulating trans-resveratrol (t-R) accumulation and the plant defence responses in Vitis vinifera cv. Kyoho cell suspension cultures for the first time. Results: It demonstrated that DHPJA had superior effects on stilbenoids accumulation over methyl jasmonate (MeJA). The optimal condition was 150 &amp;#956;M DHPJA...
Tipo: Journal article
Palavras-chave: 2; 3-dihydroxypropyl jasmonate H2O2 trans-resveratrol Vitis vinifera cell suspension cultures.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500003

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

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

Resistance of diethylenetriaminepentaacetic acid to anaerobic biodegradation
Provedor de dados: 69
Autores: Alarcón,Evelyn; Decap,Jacqueline; Vidal,Gladys.
Kraft mills are responsible for the massive discharge of highly polluted effluents, and new bleaching processes (i.e. Total Chlorine Free (TCF)) is presented as a feasible option to reduce this environmental impact. However, increased TCF pulp production is accompanied by an increase in chelate use. The most commonly used chelates, ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DPTA), are considered to be relatively persistent substances in water treatment plants, and consequently environmentally critical compounds. The purpose of this work is to investigate DPTA behaviour in an anaerobic system. An Anaerobic Filter (AF) was operated with three different DPTA load rates (LR DPTA = 0.07 - 0.28 gDPTA/L&amp;times;d), and the...
Tipo: Journal article
Palavras-chave: Anaerobic biodegradation; DTPA; Kraft mill effluent.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300011

Suppression subtractive hybridization PCR isolation of cDNAs from a Caribbean soft coral
Provedor de dados: 69
Autores: Lopez,Jose V; Ledger,Angela; Santiago-Vázquez,Lory Z; Pop,Mihai; Sommer,Dan D; Ranzer,Llanie K; Feldman,Robert A; Russell,G. Kerr.
Transcriptomic studies of marine organisms are still in their infancy. A partial, subtracted expressed sequence tag (EST) library of the Caribbean octocoral Erythropodium caribaeorum and the sea fan Gorgonia ventalina has been analyzed in order to find novel genes or differences in gene expression related to potential secondary metabolite production or symbioses. This approach entails enrichment for potential non-&amp;#8220;housekeeping&amp;#8221; genes using the suppression subtractive hybridization (SSH) polymerase chain reaction (PCR) method. More than 500 expressed sequence tags (ESTs) were generated after cloning SSH products, which yielded at least 53 orthologous groups of proteins (COGs) and Pfam clusters, including transcription factors (Drosophila...
Tipo: Journal article
Palavras-chave: CDNA; Erythropodium caribaeorum; EST; Gorgonia ventalina; Gorgonian; Sea fan.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100008

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

Treatment of low strength sewage with high suspended organic matter content in an anaerobic sequencing batch reactor and modeling application
Provedor de dados: 69
Autores: Donoso-Bravo,Andrés; Carballa,Marta; Ruiz- Filippi,Gonzalo; Chamy,Rolando.
In this work, an anaerobic sequencing batch reactor (ASBR) was operated for 8 months to treat low strength sewage with high suspended organic matter content. Three phases of operation with increasing organic loading rates (OLR) were performed: 0.4 kg COD/m³ x d (phase I), 0 .8 kg COD/m³ x d (phase II) and 1.2 kg COD/m³ x d (phase III). Adequate stability parameters (pH, total alkalinity) were obtained through all three experimental phases. During phases I and II, the removal efficiencies of organic matter (expressed as total chemical oxygen demand (COD) and total suspended solids ranged between 50-60%. However, these values decreased to 15-25% in phase III. In addition, a non-complex model, including hydrolysis, acidogenesis and methanogenesis, was applied...
Tipo: Journal article
Palavras-chave: Acidogenesis; Anaerobic treatment; Hydrolysis; Low strength wastewater; Modeling.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300013

Functional complementation in Saccharomyces cerevisiae under control of the natural yeast promoter
Provedor de dados: 69
Autores: Lavigne,Rob; Volckaert,Guido.
A novel approach for functional complementation of foreign genes in Saccharomyces cerevisiae is presented. This approach is based on the use of the widely available cognate gene plasmids (e.g. pRS416) of the European Functional Analysis Network (EUROFAN). The functional complementation of the human homolog of YOR159c (SME1 gene) shown here is the first demonstration of complementation using the original yeast promoter, theoretically offering a more natural regulation of protein expression
Tipo: Journal article
Palavras-chave: Cognate gene plasmid; Functional complementation homolog Saccharomyces cerevisiae yeast.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200014

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

Evaluation of cassava plants generated by somatic embryogenesis at different stages of development using molecular markers
Provedor de dados: 69
Autores: Osorio,Mayra; Gámez,Elizabeth; Molina,Sandy; Infante,Diógenes.
Background: Cassava (Manihot esculenta Crantz) is a crop that is high in carbohydrates in the roots and in protein in the leaves, important for both human consumption and animal feed, and also has a significant industrial use for its starches. In this study we evaluated the genetic variability with molecular markers in different stages in micropropagated plants from somatic embryos of Venezuelan native clone 56. Results: Three markers were used: ISTR, AFLP and SSR, finding that ISTR showed the highest polymorphism among individuals tested. With AFLP a high similarity between the evaluated individuals was observed and with SSR total monomorphism was seen. Using cluster analysis it was found that individuals from an embryo labeled as fasciated at the...
Tipo: Journal article
Palavras-chave: AFLP; Genetic stability; ISTR; SSR; UPGMA.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400003

Global analysis of gene function in mammals: Integration of physical, mutational and expression strategies
Provedor de dados: 69
Autores: Schimenti,John.
The field of Genetics is undergoing tumultuous change after nearly a century of standard approaches to genetic analysis. The Human Genome Project is providing tools and technologies that are changing the ways that we pursue an understanding of gene function, which is the underlying goal in modern and traditional genetics. In this paper, I overview the directions of the genome project as they relate to gene function analysis in mice and humans, and how various modern technologies are coalescing to address this in a powerful way.
Tipo: Journal article
Palavras-chave: Gene expression; ESTs; Mutagenesis; Genome; Functional genomics.
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000100005

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

Formation of highly porous biodegradable scaffolds for tissue engineering
Provedor de dados: 69
Autores: Mikos,Antonios G.; Temenoff,Johnna S.
In recent years, lack of donor organs has caused many to consider tissue engineering methods as means to replace diseased or damaged organs. This newly-emerging field uses tissue-specific cells in a three-dimensional organization, provided by a scaffolding material, to return functionality of the organ. For these applications, the choice of scaffolding material is crucial to the success of the technique. In addition to the chemical properties of the material, physical properties such as surface area for cell attachment are essential. Various methods of creating pores in these materials to increase surface area are reviewed here. Scaffolds formed using the different techniques, which include fiber bonding, solvent casting/particulate leaching, gas foaming...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000200003

Sodium azide mutagenesis resulted in a peanut plant with elevated oleate content
Provedor de dados: 69
Autores: Wang,Chuan Tang; Tang,Yue Yi; Wang,Xiu Zhen; Zhang,Shu Wei; Li,Gui Jie; Zhang,Jian Cheng; Yu,Shan Lin.
Screening of peanut seeds resulting from 0.39% sodium azide treatment with NIRS calibration equation for bulk seed samples identified a plant with more than 60% oleate. Oleate content in individual seeds of the plant, as predicted by NIRS calibration equation for intact single peanut seeds, ranged from 50.05% ~ 68.69%. Three seeds with &gt;60% oleate thus identified were further confirmed by gas chromatography. Multiple sequence alignments of the FAD2B gene from Huayu 22 (wild type) and peanut seeds with elevated oleate (mutant type) revealed a C281T transition in the coding region causing an I94T substitution in the oleoyl-PC desaturase, which may be responsible for reduction in the enzyme activity.
Tipo: Journal article
Palavras-chave: Chemical mutant; FAD2B; NIRS; Oleate; Peanut.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200010

Nucleotide sequence of a genomic clone encoding a cowpea (Vigna unguiculata L.) trypsin inhibitor
Provedor de dados: 69
Autores: Lawrence,Paulraj Kirubakaran; Nirmala,Jayaveeramuthu; Koundal,Kripa Ram.
A protease inhibitor gene has been isolated from native cowpea (Vigna unguiculata L.) cv. 130 from lambda-ZAP II genomic library. The nucleotide sequence of this genomic clone shared 86% homology with a cowpea trypsin inhibitor f IV mRNA, and 81% with Bowman-Birk protease inhibitor genes of soybean. The isolated gene had TATA and CAT signals in the 5' upstream region. The longest open reading frame had 504 bases, encoding 167 amino acids from the predicted coding region. The active serine centers of this protein was found between 105-158 amino acid residues, with a 69 amino acids long signal peptide in its N terminal. &lt;A NAME="Article"&gt;&lt;/A&gt;
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000100005

Establishment of an efficient callus induction and plant regeneration system in Pakistani wheat (Triticum aestivum) cultivars
Provedor de dados: 69
Autores: Rashid,Umer; Ali,Shaukat; Ali,Ghulam Muhammad; Ayub,Najma; Masood,M. Shahid.
Four commercially grown wheat varieties of Pakistan, namely Inqilab-91, Chakwal-97, Tatara and Manthar were used for this investigation. For callus induction different concentrations of 2,4-Dichlorophenoxyaceticacid (2,4-D) along with 0.1 mg/L of Kinetin were evaluated. For regeneration initially different concentrations of Indole-3-Acetic Acid (IAA) and 6-BenzylAminoPurine (BAP) were tested. Best hormone combinations were further subjected to Kinetin and 6-&amp;#947;-&amp;#947;-dimethylallylaminopurine (2iP). For Inqilab-91, Chakwal-97 and Manthar, 3 mg/L of 2,4-D was found optimum, which induced 83.25%, 77.75% and 95.20% of embryogenic calli, respectively. Maximum callus induction (97.18%) was observed in Tatara when 2 mg/L of 2,4-D was used. As regard...
Tipo: Journal article
Palavras-chave: 2; 4-D 2iP BAP callus induction IAA kinetin regeneration wheat.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300004

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

Effect of pH in the survival of Lactobacillus salivarius strain UCO_979C wild type and the pH acid acclimated variant
Provedor de dados: 69
Autores: Sanhueza,Enrique; Paredes-Osses,Esteban; González,Carlos L; García,Apolinaria.
Background Bacterial acclimation involves cellular changes permitting the survival of a microorganism to prolonged acid pH exposure. The general aim of this work is to support this idea by determining the effect of pH in the survival of the human gastric derived probiotic strain Lactobacillus salivarius UCO_979C-1 (wild type) and L. salivarius UCO_979C-2 (acclimation to pH 2.6), which possesses anti-Helicobacter pylori properties. Results To assess this aim, the exopolysaccharide production through the phenol-sulfuric acid method was evaluated. Moreover, morphological and structural changes by transmission and scanning electron microscopy were observed. The bacterial survival was measured by viable count. The results showed that the acclimated variant...
Tipo: Journal article
Palavras-chave: Acid stress; Acclimation; Lactobacillus salivarius.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500003

Methanogenic toxicity evaluation of chlortetracycline hydrochloride
Provedor de dados: 69
Autores: Reyes-Contreras,Carolina; Vidal,Gladys.
Background Anaerobic digestion is a technology applied successfully to converting organic matter into biogas. However, the presence of inhibitory compounds such as antibiotics can adversely affect methane production. The aim of this study is to evaluate the toxic effect of chlortetracycline hydrochloride (CLOR) on the methanogenic bacteria. In order to study the methanogenic toxicity of CLOR, different concentrations of CLOR (10, 50, 100, 200 mg L- 1) were evaluated by methanogenic toxicity assays using three feedings. Results Maximum methane production was obtained for the assays with 10 mg CLOR L- 1, the values obtained were 277 ± 4.07; 193 ± 11.31 and 166 ± 7.07 mL for the first, second and third feedings, respectively. The average values for acetic,...
Tipo: Journal article
Palavras-chave: Antibiotics; Anaerobic batch assay; Bacterial inhibition; Volatile fatty acids.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600010

Isolation and characterization of novel potent Cr(VI) reducing alkaliphilic Amphibacillus sp. KSUCr3 from hypersaline soda lakes
Provedor de dados: 69
Autores: Ibrahim,Abdelnasser S.S; El-Tayeb,Mohamed A; Elbadawi,Yahya B; Al-Salamah,Ali A.
A strain KSUCr3 with extremely high Cr(VI)-reducing ability under alkaline conditions was isolated from hypersaline soda lakes and identified as Amphibacillus sp. on the basis of 16S rRNA gene sequence analysis. The results showed that Amphibacillus sp. strain KSUCr3 was tolerance to very high Cr(VI) concentration (75 mM) in addition to high tolerance to other heavy metals including Ni2+ (100 mM), Mo2+ (75 mM), Co2+ (5 mM), Mn2+ (100 mM), Zn2+ (2 mM), Cu2+ (2 mM) and Pb (75 mM). Strain KSUCr3 was shown to be of a high efficiency in detoxifying chromate, as it could rapidly reduce 5 mM of Cr(VI) to a non detectable level over 24 hrs. In addition, strain KSUCr3 could reduce Cr(VI) efficiently over a wide range of initial Cr(VI) concentrations (1-10 mM) in...
Tipo: Journal article
Palavras-chave: Amphibacillus sp.; Bioremediation; Chromate reduction; Heavy metals; Soda lake.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400004

Engineering bacterial strains through the chromosomal insertion of the chlorocatechol catabolism tfdI CDEF gene cluster, to improve degradation of typical bleached Kraft pulp mill effluent pollutants
Provedor de dados: 69
Autores: Bobadilla,Roberto; Varela,Cristián; Céspedes,Ricardo; González,Bernardo.
Chloroaromatic pollutants from bleached Kraft pulp mill effluents (BKME) are difficult to degrade, because bacterial strains present in BKME aerobic treatments, only partially degrade these compounds, accumulating the corresponding chlorocatechol intermediates. To improve the catabolic performance of chlorocatechol-accumulating strains, we introduced, by chromosomal insertion, the tfdI CDEF gene cluster from Ralstonia eutropha JMP134 (pJP4). This gene cluster allows dechlorination and channelling of chlorocatechols into the intermediate metabolism. Two bacterial strains, R. eutropha JMP222 and Pseudomonas putida KT2442, able to produce chlorocatechols from 3-chlorobenzoate (3-CB) were used. Acinetobacter lwoffii RB2 isolated from BKME by its ability to...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200011

Production, purification and characterization of an ionic liquid tolerant cellulase from Bacillus sp. isolated from rice paddy field soil
Provedor de dados: 69
Autores: Sriariyanun,Malinee; Tantayotai,Prapakorn; Yasurin,Patchanee; Pornwongthong,Peerapong; Cheenkachorn,Kraipat.
Background: Lignocellulosic biomass is a renewable, abundant, and inexpensive resource for biorefining process to produce biofuel and valuable chemicals. To make the process become feasible, it requires the use of both efficient pretreatment and hydrolysis enzymes to generate fermentable sugars. Ionic liquid (IL) pretreatment has been demonstrated to be a promising method to enhance the saccharification of biomass by cellulase enzyme; however, the remaining IL in the hydrolysis buffer strongly inhibits the function of cellulase. This study aimed to isolate a potential IL-tolerant cellulase producing bacterium to be applied in biorefining process. Result: One Bacillus sp., MSL2 strain, obtained from rice paddy field soil was isolated based on screening of...
Tipo: Journal article
Palavras-chave: Biorefinery; Cellulase; Ionic liquid; Lignocellulosic biomass.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100004

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

RAPD and freezing resistance in Eucalyptus globulus
Provedor de dados: 69
Autores: Fernández R.,Marta; Valenzuela A.,Sofía; Balocchi L.,Claudio.
Eucalyptus globulus is the second most important forest species in Chile, after Pinus radiata. The main advantages of E. globulus are its fast growth (25 m³/ha/year) and its excellent wood quality for kraft pulp production. On the negative side, its low freezing tolerance has been an obstacle for the expansion of plantations, specifically on the foothills of the Andes. The difference in the freezing resistance between clones of E. globulus has a genetic base and, therefore, it could be detected through DNA molecular markers. Fifteen clones of E. globulus, eight classified as freezing resistant and seven as freezing sensitive were analyzed using the technique of RAPD, in order to obtain molecular markers that could differentiate between freezing sensitive...
Tipo: Journal article
Palavras-chave: Eucalyptus globulus; Freezing resistance; Molecular markers; RAPD.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300025

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

The crustacean selenoproteome similarity to other arthropods homologs: A mini review
Provedor de dados: 69
Autores: García-Triana,Antonio; Yepiz-Plascencia,Gloria.
Selenoproteins (Sels) are involved in oxidative stress regulation. Glutathione peroxidase (GPx) and thioredoxin reductase are among the most studied Sels in crustaceans. Since their expressions and activities are affected by pathogens, environmental and metabolic factors, their functions might be key factors to orchestrate the redox cellular balance. The most studied invertebrate selenoproteome is from Drosophila. In this fly, SelD and SelB are involved in selenoproteins synthesis, whereas SelBthD, SelH and SelK are associated with embryogenesis and animal viability. None of the Sels found in Drosophila have been identified in marine crustaceans yet, and their discovery and function identification is an interesting research challenge. SelM has been...
Tipo: Journal article
Palavras-chave: Functions; Invertebrates; Redox; Selenoproteins.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500017

Selection of white-rot fungi to formulate complex and coated pellets for Reactive Orange 165 decolourization
Provedor de dados: 69
Autores: Elgueta,Sebastián; Rubilar,Olga; Lima,Nelson; Diez,M. Cristina.
Six strains of white-rot fungi isolated from southern Chile were evaluated for their ergosterol/biomass correlation and ligninolytic potential in solid medium to formulate pellets for Reactive Orange 165 (RO165) decolourization. The fungus Anthracophyllum discolor was selected to formulate complex pellets (fungal mycelium, sawdust, and activated carbon), coated pellets (complex pellet + alginate) and simple pellets (fungal mycelium). The activity of ligninolytic enzymes (laccase, manganese peroxidase, manganese-independent peroxidase, and lignin peroxidase) was evaluated in both the complex and coated pellets in modified Kirk medium, and the morphology of the pellets was studied using scanning electron microscopy (SEM). Complex pellets of A. discolor...
Tipo: Journal article
Palavras-chave: Complex pellets; Ligninolytic enzymes; RO165 decolourization; White-rot fungi.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600008

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

Strategies to capture biotechnology opportunities in Chile
Provedor de dados: 69
Autores: Cuevas,Cristian Hernandez; Valenzuela,Pablo D. T.
Two complementary strategies are proposed to help develop the biotechnology industry in Chile. The objectives of such propositions are based on identifying business opportunities, which can be transformed into biotechnology projects that complement the competitive advantages of the most active areas of the Chilean economy. As a result, the establishment of these initiatives may create the proper business environment where good information, investors&amp;rsquo; safeguards and economic incentives would be provided to encourage investors to support new biotechnology ventures focused on mining, aquaculture, forestry, as well as wine and fruit production. In addition, a complete description of the Chilean biotechnology industry is provided. Amongst other...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200010

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

Feasibility study of organic matter and Ammonium removal using loofa sponge as a supporting medium in an aerated submerged fixed-film reactor (ASFFR)
Provedor de dados: 69
Autores: Nabizadeh,Ramin; Naddafi,Kazem; Mesdaghinia,Alireza; Nafez,Amir Hosien.
Biofilm systems are efficient in the removal of organic matter and ammonium from wastewaters. In this study, loofa sponge, a natural product, was used as a supporting medium in an aerated submerged fixed-film reactor to evaluate its performance in removing organic matter and nitrogen from wastewater. Four pilot runs were performed with chemical oxygen demand (COD) concentrations of 100, 200, 300 and 400 mg l-1 to provide an organic loading rate of 0.6, 1.2, 1.8, and 2.4 kg m-3d-1 respectively. In these pilot runs, the influent ammonium nitrogen concentrations were justified to 5, 10, 15 and 20 mg l-1 as N to provide an influent nitrogen loading of 30, 60, 90 and 120 g m-3.d-1 respectively. Although soluble COD removal efficiency greater than 80 percent was...
Tipo: Journal article
Palavras-chave: Aerated submerged fixed-film reactor; Biofilm; Fixed-Film; Loofa; Organic matter removal; Sponge.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400006

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

Single nucleotide polymorphisms in partial sequences of the gene encoding the large sub-units of ADP-glucose pyrophosphorylase within a representative collection of 10 Musa genotypes
Provedor de dados: 69
Autores: Mahendhiran,Muhilan; Ramirez-Prado,Jorge Humberto; Escobedo-Gracia Medrano,Rosa Maria; Canto-Canché,Blondy; Tzec-Simá,Miguel; Grijalva-Arango,Rosa; James-Kay,Andrew.
Background ADP-glucose pyrophosphorylase (AGPase) is a rate-limiting enzyme catalyzing the first step in the starch biosynthesis pathway in higher plants. To date, there are no reported variants or isoforms of the AGPase enzyme in bananas (Musa spp. family Musaceae) as is the case of other plants. In this study, genomic DNA sequences homologous to the gene encoding one of the large subunits of the enzyme were amplified from 10 accessions of the genus Musa, including representatives of wild ancestors (AA and BB genomes), dessert bananas (AA, AAA, AB and AAB genomes), plantains (AAB genome) and cooking bananas (ABB and AAA genomes), and studied in order to find single nucleotide polymorphisms (SNP) base variations in Musa accessions. Results In the 810-base...
Tipo: Journal article
Palavras-chave: Haplotypes; Starch metabolism enzyme; Variants.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000300006

Genetic diversity of breeding popcorn lines determined by SSR markers
Provedor de dados: 69
Autores: Ribeiro Trindade,Ana Paula; Barth Pinto,Ronald José; Amaral Júnior,Antonio Teixeira do; Mangolin,Claudete Aparecida; Silva Machado,Maria de Fátima Pires da; Scapim,Carlos Alberto.
Information about genetic dissimilarity is very important to corroborate genealogical relationships and to predict the most heterozygotic hybrid combinations. Eight popcorn S6 lines of diverse germplasm types were evaluated using simple sequence repeats (SSR) markers. Of a total of 51 evaluated polymorphic primers, 15 were used for polymerase chain reaction (PCR) amplification. The genetic distance was estimated by Rogers&amp;#8217; modified distance. The different popcorn breeding programs in Brazil are possibly using highly similar base-populations. The genetic similarity of lines P1-3 and P8-1 was lowest, while P3-3 and P8-2 were genetically more similar. The cophenetic correlation showed that the Unweighted Pair-Group Method Using Arithmetic Averages...
Tipo: Journal article
Palavras-chave: Advanced generations; Genetic variability; Molecular markers; Zea mays.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100004

High-yield production of the human lysozyme by Pichia pastoris SMD1168 using response surface methodology and high-cell-density fermentation
Provedor de dados: 69
Autores: Yu,Ying; Zhou,Xiaoyu; Wu,Sheng; Wei,Tiantian; Yu,Long.
Background Lysozyme plays a crucial role in innate immunity with its well-recognized bacteriolytic activity. In this study, the influence of expression parameters (inoculation volume, culture volume, growth time, induction temperature and time, initial pH and methanol concentration) on human lysozyme (HLZ) production in recombinant P. pastoris SMD1168 was investigated through Plackett-Burman (PB) design and response surface methodology (RSM). Results It was revealed that induction temperature, induction time and culture volume had significant influence (P &lt; 0.01) on HLZ expression level, which were elected for further optimization with three-dimensional response surface designs for enhanced HLZ production. The highest lysozyme activity reached 3301 U/mL...
Tipo: Journal article
Palavras-chave: Expression optimization; LYZ; Plackett-Burman design; RSM.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600009

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

Response surface methodology based optimization for degradation of align in Laminaria japónica feedstuff via fermentation by Bacillus in Apostichopus japónicas farming
Provedor de dados: 69
Autores: Wang,Xitao; Wang,Lili; Li,Xiaoyu; Xu,Yongping.
Background: The alga Laminaria japonica is the most economically important brown seaweed cultured in China, which is used as food and aquatic animal feedstuff. However, the use of L. japonica as a feedstuff in Apostichopus japonicasfarming is not ideal because A. japonicas does not produce enough enzyme activity for degrading the large amount of algin present in L. japonica. In this study, semi solid fermentation of the L. japonica feedstuff employing a Bacillus strain as the microbe was used to as a mean to degrade the algin content in L. japonica feedstuff. Results: The Bacillus strain, Bacillus amyloliquefaciens WB1, was isolated by virtue of its ability to utilize sodium alginate as the sole carbon source. Eight factors affecting growth and...
Tipo: Journal article
Palavras-chave: Align; Bacillus amyloliquefaciens; Central-Composite Design; Plackett-Burman design; Sea cucumber.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400001

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

Use of AFLP markers to estimate molecular diversity of Phakopsora pachyrhizi
Provedor de dados: 69
Autores: Lourdes Rocha,Carla Maria; Vellicce,Gabriel Ricardo; García,María Gabriela; Pardo,Esteban Mariano; Racedo,Josefina; Perera,María Francisca; de Lucía,Adrian; Gilli,Javier; Bogado,Noelia; Bonnecarrère,Victoria; German,Silvia; Marcelino,Francismar; Ledesma,Fernando; Reznikov,Sebastián; Ploper,Leonardo Daniel; Welin,Bjorn; Castagnaro,Atilio Pedro.
Background Asian soybean rust (SBR) caused by Phakopsora pachyrhizi Syd. &amp;amp; Syd., is one of the main diseases affecting soybean and has been reported as one of the most economically important fungal pathogens worldwide. Knowledge of the genetic diversity of this fungus should be considered when developing resistance breeding strategies. We aimed to analyze the genetic diversity of P. pachyrhizi combining simple sampling with a powerful and reproducible molecular technique. Results We employed Amplified Fragment Length Polymorphism (AFLP) technique for the amplification of P. pachyrhizi DNA extracted from naturally SBR-infected plants from 23 production fields. From a total of 1919 markers obtained, 77% were polymorphic. The high percentage of...
Tipo: Journal article
Palavras-chave: Asian soybean rust; Genetic variation; Glycine max; Molecular markers.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600009

Using a neural network to backtranslate amino acid sequences
Provedor de dados: 69
Autores: White,Gilbert; Seffens,William.
A neural network (NN) was trained on amino and nucleic acid sequences to test the NN’s ability to predict a nucleic acid sequence given only an amino acid sequence. A multi-layer backpropagation network of one hidden layer with 5 to 9 neurons was used. Different network configurations were used with varying numbers of input neurons to represent amino acids, while a constant representation was used for the output layer representing nucleic acids. In the best-trained network, 93% of the overall bases, 85% of the degenerate bases, and 100% of the fixed bases were correctly predicted from randomly selected test sequences. The training set was composed of 60 human sequences in a window of 10 to 25 codons at the coding sequence start site. Different NN...
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000300009

Ethanol production from sweet sorghum juice under very high gravity conditions: Batch, repeated-batch and scale up fermentation
Provedor de dados: 69
Autores: Nuanpeng,Sunan; Laopaiboon,Lakkana; Srinophakun,Penjit; Klanrit,Preekamol; Jaisil,Prasit; Laopaiboon,Pattana.
Batch ethanol fermentations from sweet sorghum juice by Saccharomyces cerevisiae NP 01 were carried out in a 500 ml air-locked Erlenmeyer flask under very high gravity (VHG) and static conditions. The maximum ethanol production efficiency was obtained when 9 g l-1 of yeast extract was supplemented to the juice. The ethanol concentration (P), productivity (Qp) and yield (Yp/s) were 120.24 ± 1.35 g l-1, 3.01 ± 0.08 g l-1 h-1 and 0.49 ± 0.01, respectively. Scale up ethanol fermentation in a 5-litre bioreactor at an agitation rate of 100 rev min-1 revealed that P, Qp and Yp/s were 139.51 ± 0.11 g l-1, 3.49 ± 0.00 g l-1 h-1 and 0.49 ± 0.01, respectively, whereas lower P (119.53 ± 0.20 g l-1) and Qp (2.13 ± 0.01 g l-1 h-1) were obtained in a 50-litre bioreactor....
Tipo: Journal article
Palavras-chave: Batch; Ethanol fermentation; Repeated-batch; Scale up; Sweet sorghum; VHG.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100004

Mechanisms and roles of the RNA-based gene silencing
Provedor de dados: 69
Autores: Jana,Snehasis; Chakraborty,Chiranjib; Nandi,Shyamsundar.
RNA silencing is a remarkable type of gene regulation. This process has been found to occur in many different organisms such as plants (co-suppression), fungi (quelling), and animals (RNA interference; RNAi). Double-stranded RNA (dsRNA) is a potent trigger in RNA silencing mechanisms operating in a wide range of organisms. This mechanism recognizes dsRNA and processes them into small 21-25nt RNAs (smRNAs). Small RNAs can guide post-transcriptional degradation of complementary messenger RNAs and in plants, transcriptional gene silencing is occurred by methylation of homologous DNA sequences. In plants, it serves as an antiviral defense, and many plant viruses encode suppressors of silencing such as helper component-proteinase of potyviruses (HC-Pro) and the...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300015

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

Efficient expression and characterization of a cold-active endo-1, 4-&amp;#946;-glucanase from Citrobacter farmeri by co-expression of Myxococcus xanthus protein S
Provedor de dados: 69
Autores: Bai,Xi; Yuan,Xianjun; Wen,Aiyou; Li,Junfeng; Bai,Yunfeng; Shao,Tao.
Background: Cold-active endo-1, 4-&amp;#946;-glucanase (EglC) can decrease energy costs and prevent product denaturation in biotechnological processes. However, the nature EglC from C. farmeri A1 showed very low activity (800 U/L). In an attempt to increase its expression level, C. farmeri EglC was expressed in Escherichia coli as an N-terminal fusion to protein S (ProS) from Myxococcus xanthus. Results: A novel expression vector, pET(ProS-EglC), was successfully constructed for the expression of C. farmeri EglC in E. coli. SDS-PAGE showed that the recombinant protein (ProS-EglC) was approximately 60 kDa. The activity of ProS-EglC was 12,400 U/L, which was considerably higher than that of the nature EglC (800 U/L). ProS-EglC was active at pH 6.5-pH 8.0,...
Tipo: Journal article
Palavras-chave: Cellulose degradation; Cellulose; Cold-active enzyme; Endoglucanases; Enzymatic properties; Escherichia coli; Expression; Novel expression vector; N-terminal fusion; Protein S-tag; Recombinant protein.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600012

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

Intein-mediated expression of cecropin in Escherichia coli
Provedor de dados: 69
Autores: Díaz,Mauricio; Venturini,Elena; Marchetti,Stefano; Arenas,Gloria; Marshall,Sergio H.
Different strategies have been used to overcome the difficulties to produce antimicrobial peptides. Here we used Intein Mediated Purification with an Affinity Chitin-binding Tag (IMPACT-System, New England Biolabs) for the expression of the antimicrobial peptide cecropin to reduce its sensitivity to intracellular proteases and use its inducible self-cleaving capability to remove the carrier. Cecropin was cloned into suitable expression vector pTYB11, and expression induced by IPTG in Escherichia coli ER2566. The use of 22ºC induction allowed the expression of cecropin with its intein carrier in soluble form. Cell extracts were purified by chitin affinity chromatography and intein-mediated splicing of the target protein was achieved by thiol addition,...
Tipo: Journal article
Palavras-chave: Antimicrobial; Cecropin; Fusion; Intein; Peptide; Soluble.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200003

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

Generation and analysis of an Eucalyptus globulus cDNA library constructed from seedlings subjected to low temperature conditions
Provedor de dados: 69
Autores: Rasmussen-Poblete,Susana; Valdes,Jorge; Gamboa,Maria Cecilia; Valenzuela,Pablo D.T; Krauskopf,Erwin.
Eucalyptus globulus is the most important commercial temperate hardwood in the world because of its wood properties and due to its characteristics for biofuel production. However, only a very low number of expressed sequence tags (ESTs) are publicly available for this tree species. We constructed a cDNA from E. globulus seedlings subjected to low temperature and sequenced 9,913 randomly selected clones, generating 8,737 curated ESTs. The assembly produced 1,062 contigs and 3,879 singletons forming a Eucalyptus unigene set. Based on BLASTX analysis, 89.3% of the contigs and 88.5% of the singletons had significant similarity to known genes in the non-redundant database of GenBank. The Eucalyptus unigene set generated is a valuable public resource that...
Tipo: Journal article
Palavras-chave: Cellulose; Cold-temperature; EST database; Forest biotechnology; Lignin.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200008

Fermentation optimization of maltose-binding protein fused to neutrophil-activating protein from Escherichia coli TB1
Provedor de dados: 69
Autores: Lu,Jike; Song,Qi; Ji,Zhenyu; Liu,Xin; Wang,Ting; Kang,Qiaozhen.
Background The fermentation conditions of recombinant maltose-binding protein fused to neutrophil-activating protein (rMBP-NAP) of Helicobacter pylori were optimized from Escherichia coli TB1 with varying medium, inoculum age and size, time, inducer, pH and temperature in batch fermentation. Results It was revealed that the optimal conditions for the production of rMBP-NAP in shake flask were as follows: M9 medium (with 3% yeast extract powder added), inoculum age of 19 h, inoculum size of 6%, initial pH of 6.6, temperature of 37°C, and 0.7 mmoL/L IPTG inducted 21 h in a 50 mL/250 mL shake flask. The recombinant protein yield was increased from 59 to 592 mg/L after optimization. Fermentation process conducted in a 10 L fermenter with similar conditions...
Tipo: Journal article
Palavras-chave: Escherichia coli; Fermentation; Optimization; Recombinant protein.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400004

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

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

Genetic instability and oral cancer
Provedor de dados: 69
Autores: Park,No-Hee; Kang,Mo K.
Development of oral cancer proceeds through discrete molecular genetic changes that are acquired from the loss of genomic integrity after continued exposure to environmental risk factors. Of particular importance in oral cancer development are tobacco-related chemical carcinogens and human papillomavirus (HPV) infection. To understand the mechanisms by which these risk factors contribute to tumorigenesis, we developed an in vitro model of sequential, multistep oral carcinogenesis model of normal human oral keratinocytes (NHOK) by immortalizing these cells with cloned "high risk" HPV genome. HPV viral genome alone failed to give rise to a tumorigenic cell population, which required further exposure to chemical carcinogens. HPV-immortalized cells exhibited...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000100005

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

EST sequencing and SSR marker development from cultivated peanut (Arachis hypogaea L.)
Provedor de dados: 69
Autores: Song,Guo Qi; Li,Meng Jun; Xiao,Han; Wang,Xing Jun; Tang,Rong Hua; Xia,Han; Zhao,Chuan Zhi; Bi,Yu Ping.
Making use of the gene resources of wild type peanuts is a way to increase the genetic diversity of the cultivars. Marker assisted selection (MAS) could shorten the process of inter-specific hybridization and provide a possible way to remove the undesirable traits. However, the limited number of molecular markers available in peanut retarded its MAS process. We started a peanut ESTs (Expressed Sequence Tags) project aiming at cloning genes with agronomic importance and developing molecular markers. In this study we found 610 ESTs that contained one or more SSRs from 12,000 peanut ESTs. The most abundant SSRs in peanut are trinucleotides (66.3%) SSRs and followed by dinucleotide (28.8%) SSRs. AG/TC (10.7%) repeat was the most abundant and followed by CT/GA...
Tipo: Journal article
Palavras-chave: Arachis hypogaea L.; Cultivars; EST-SSR; Polymorphism; Wild-type peanut.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300007

Effects of biosorption parameter: kinetics, isotherm and thermodynamics for Ni(II) biosorption from aqueous solution by Circinella sp.
Provedor de dados: 69
Autores: Alpat,Senol; Alpat,Sibel Kilinç; Çadirci,Bilge Hilal; Özbayrak,Özge; Yasa,Ihsan.
Circinella sp. was employed as a biosorbent for removal of Ni(II) from aqueous solution. The biosorption kinetics and isotherms were investigated. The effect of several parameters, such as biosorbent dosage, contact time, initial concentration, pH and temperature, on biosorption process was evaluated. The kinetic studies indicated that the biosorption followed pseudo-second order kinetic model. Biosorption behaviour of Ni(II) on Circinella sp. was expressed by both Langmuir and Freundlich isotherms. The equilibrium data fit better to the Langmuir model compared to the Freundlich model in concentration range studied (1.0-3.0 mM). The thermodynamic parameters (&amp;#916;G0, &amp;#916;H0 and &amp;#916;S0) were also determined, and it was found that the Ni(II)...
Tipo: Journal article
Palavras-chave: Biosorption; Circinella sp; Equilibrium; Kinetic; Nickel.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500004

Genotypic variation of Agrobacterium-mediated transformation of Italian ryegrass
Provedor de dados: 69
Autores: Lee,Ki-Won; Choi,Gi Jun; Kim,Ki-Yong; Yoon,Sei Hyung; Ji,Hee Chung; Park,Hyung Soo; Lim,Young Chul; Lee,Sang-Hoon.
In the present study, genotypic variation of Agrobacterium-mediated transformation of Korean Italian ryegrass has been evaluated. Mature seed-derived calli of seven cultivars were inoculated and co-cultured with Agrobacterium tumefaciens carrying the binary vector pCAMBIA1301, which contains a reporter gene (gus) and a plant selectable marker gene conferring resistance to hygromycin (hpt) in the T-DNA region. The effects of several factors such as callus type and callus age on transformation effectiveness and the expression of the GUS gene were investigated. The highest transformation effectiveness (6.7%) was obtained with the Hwasan 101 cultivar when 9-week-old calli (type-I) were inoculated with Agrobacterium. The overall transformation rates of the...
Tipo: Journal article
Palavras-chave: Agrobacterium; Forage crop; Italian ryegrass; Transgenic plants.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300008

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

Growth and antibacterial activity of Lentinula edodes in liquid media supplemented with agricultural wastes
Provedor de dados: 69
Autores: Hiroko Hassegawa,Regina; Megumi Kasuya,Maria Catarina; Dantas Vanetti,Maria Cristina.
Antibacterial activity of Lentinula edodes against Bacillus subtilis was evaluated in cell-free filtrates obtained after growth in 14 different culture media. The highest B. subtilis growth inhibition was promoted by filtrates of growth media supplemented with rice bran, vermiculite or molasses. L. edodes dry mycelial biomass in liquid culture with 0.5% added rice bran was 3.2 mg/ml, after growth for 30 days at 25&amp;ordm;C without shaking, and 4.3 mg/ml under orbital shaking (150 rpm). However, antibacterial activity, detected between 20 and 24 days of incubation of stationary cultures, was absent in filtrates of aerated cultures. Temperatures of 20-25&amp;ordm;C enhanced both growth and antibacterial activity. Optimum pH for L. edodes mycelial growth...
Tipo: Journal article
Palavras-chave: Bacterial inhibition; Bioconversion; Mycelial growth; Mushroom; Shiitake.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200011

Selection of Arthrospira platensis strains with productivity in brackish water with high boron levels for commercial production in the Lluta Valley
Provedor de dados: 69
Autores: Oxa,Patricio; Bastías,Elizabeth; Uribe,Eduardo.
Adaptation and selection of Arthrospira platensis strains, for cultivation in brackish water with excess boron (B) in the Lluta Valley can become an interesting alternative that would allow to extend these cultures to areas that possess the environmental conditions, but that lack the fresh water needed to do it. Strains TX98 and P88 were evaluated in laboratory conditions with three different media of brackish water and with the white medium, the Zarrouk modified medium (MZM). The growing media with brackish water with a B concentration present in the Lluta River of 20 mgL-1 (B20) and medium with 30 mgL-1 (B30), and 10 mg L-1 of B (B10). The effect of the different media on the growing parameters with a culture temperature of 25 ± 1ºC in the three...
Tipo: Journal article
Palavras-chave: Brackish water; Boron; Growth medium; Microalgae; Spirulina (Arthrospira).
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500019

Efficient protocol for isolation of functional RNA from different grape tissue rich in polyphenols and polysaccharides for gene expression studies
Provedor de dados: 69
Autores: Vasanthaiah,Hemanth K.N.; Katam,Ramesh; Sheikh,Mehboob B.
Extraction of RNA from plant tissue containing high levels of polyphenols and polysaccharides is tedious and difficult in grapes. Although several protocols have been published for plant RNA isolation, most have failed to yield high quality RNA in sufficient quantity from mature and diseased grape tissue. We describe a protocol for isolating intact and high quality RNA from various grape tissues as evident by high A260/A280 absorbance ratio (1.8 to 1.9) and electrophoretic profile on denaturing formaldehyde agarose gel. On an average, 205 µg RNA per g of fresh tissue were obtained using this modified protocol. RNA quality was further assessed through RT-PCR, differential display RT-PCR and subtractive hybridization, and found to be suitable for molecular...
Tipo: Journal article
Palavras-chave: Differential display RT-PCR; Grape; RNA isolation; RT-PCR; Subtractive hybridization; Vitis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300005

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

Efficient identification of tetR-expressing cell lines for tetracycline-regulated gene expression
Provedor de dados: 69
Autores: Song,Ping; Wang,Hwa-Chain Robert.
The technology of tetracycline-inducible gene expression has been successfully used in experimental biology to identify the function and downstream signaling pathways of an interested gene. It has been significantly improved to meet the criteria with specificity to exogenous non-toxic inducers, independent regulation from cellular pathways, and dose-dependent inducibility and reversibility. However, to establish tetracycline-inducible gene expression in mammalian cells is still a time-and effort-consuming process. With a tetracycline-inducible gene expression system T-REx, we have developed a practical protocol to use the oncogenic H-ras gene as a dominant reporter gene to increase efficiency in attaining desired cell lines in which ectopic expression of a...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200013

Use of Candida rugosa lipase immobilized on sepabeads for the amyl caprylate synthesis: Batch and fluidized bed reactor study
Provedor de dados: 69
Autores: Saponji,Svetlana; Kneevi-Jugovi,Zorica D; Bezbradica,Dejan I; Zuza,Milena G; Saied,Omar Ali; Boskovi-Vragolovi,Nevenka; Mijin,Dusan Z.
Lipase from Candida rugosa was covalently immobilized on Sepabeads EC-EP for application for amyl caprylate synthesis in an organic solvent system. Several solvents were tested in terms of biocatalyst stability and the best result was obtained with isooctane. The lipase-catalyzed esterification in the selected system was performed in batch and fluidized bed reactor systems. The influence of several important reaction parameters including temperature, initial water content, enzyme loading, acid/alcohol molar ratio, and time of addition of molecular sieves is carefully analyzed by means of an experimental design. Almost complete conversion (&gt; 99%) of the substrate to ester could be performed in a batch reactor system, using lipase loading as low as 37 mg...
Tipo: Journal article
Palavras-chave: Bioreactors; Covalent immobilization; Ester; Non-aqueous system; Optimization technique.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600012

Gene expression of a putative glutathione S-transferase is responsive to abiotic stress in embryogenic cell cultures of Cyclamen persicum
Provedor de dados: 69
Autores: Hoenemann,Claudia; Ambold,Juliane; Hohe,Annette.
Background: Cyclamen persicum is an economically important ornamental crop that is propagated exclusively through seeds as vegetative propagation using cuttings is not possible. Therefore a micropropagation method through somatic embryogenesis is of high interest; however the method suffers from low reliability concerning quality and quantity of the produced plantlets. A crucial step of the protocol is the removal of plant growth regulators (PGRs) that triggers embryo development. In order to get a better insight in this crucial step of the propagation process, a gene expression analysis has been set up using five different genes of glutathione S-transferases (GST) as these are known to be auxin responsive as well as stress reactive. Results: One out of...
Tipo: Journal article
Palavras-chave: Auxin; Callus; Micropropagation; Semisolid medium; Suspension culture.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100006

Thiosulphate oxidation by Thiobacillus thioparus and Halothiobacillus neapolitanus strains isolated from the petrochemical industry
Provedor de dados: 69
Autores: Valdebenito-Rolack,Emky H; Araya,Tamara C; Abarzua,Leslie E; Ruiz-Tagle,Nathaly M; Sossa,Katherine E; Aroca,Germán E; Urrutia,Homero E.
Sulphur Oxidizing Bacteria (SOB) is a group of microorganisms widely used for the biofiltration of Total Reduced Sulphur compounds (TRS). TRS are bad smelling compounds with neurotoxic activity which are produced by different industries (cellulose, petrochemical). Thiobacillus thioparus has the capability to oxidize organic TRS, and strains of this bacterium are commonly used for TRS biofiltration technology. In this study, two thiosulphate oxidizing strains were isolated from a petrochemical plant (ENAP BioBio, Chile). They were subjected to molecular analysis by real time PCR using specific primers for T. thioparus. rDNA16S were sequenced using universal primers and their corresponding thiosulphate activities were compared with the reference strain T....
Tipo: Journal article
Palavras-chave: Biofiltration; Dimethyldisulphide; Dimethylsulphide; Thiobacillus; Thiosulphate.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100007

The release of light metals from a brown seaweed (Sargassum sp.) during zinc biosorption in a continuous system
Provedor de dados: 69
Autores: da Costa,Antonio Carlos Augusto; Mora Tavares,Ana Paula; Pessôa de França,Francisca.
The biosorption of zinc and calcium was investigated with a biomass of Sargassum sp., a brown seaweed, in a continuous system consisting of three serial tubular fixed-bed laboratory reactors. Results indicated that zinc was efficiently recovered by the biomass. After treatment of 9.0 liters of a mixed solution containing 130.0 mg/l zinc and 260.0 mg/l calcium, the first column of the system saturated with zinc; the remaining columns did not saturate with zinc as a result of the pre treatment performed by the first reactor. Calcium was also efficiently biosorbed by the biomass, saturating the system much faster than zinc. X-ray fluorescence spectrum indicated the presence of various elements in the structure of the Sargassum sp. biomass, especially alkaline...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300007

Solid-state fermentation of Bacillus thuringiensis tolworthi to control fall armyworm in maize
Provedor de dados: 69
Autores: Fontana Capalbo,Deise Maria; Valicente,Fernando Hercule; Oliveira Moraes,Iracema de; Pelizer,Lúcia Helena.
The well-known entomopathogenic bacterium Bacillus thuringiensis (Bt) produces a spore-crystal complex which is responsible for its biocide characteristic, and the bacterium can be obtained by fermentation, either in liquid or semi-solid substrates. This paper presents a successful way to achieve solid-state fermentation of active Bt var. tolworthi (Btt) against Spodoptera frugiperda (fall armyworm) in corn. More than 10(9) CFU/g were obtained using humidified rice as substrate maintained in polypropylene bags. This active complex (substrate plus spore-crystal of Bt) was prepared in order to obtain 2 x 10(6) spores/mL; the final suspension then sprayed via tractor on corn fields. On the treated plants, mortality of neonate larvae was 100% within two days...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200009

Perspectives on the application of biotechnology to assist the genetic enhancement of plantain and banana (Musa spp.)
Provedor de dados: 69
Autores: Crouch,Jonathan H.; Vuylsteke,Dirk; Ortiz,Rodomiro.
Bananas and plantains (Musa spp.) are the most important tropical fruit crops. They form an integral component of the farming systems in the humid agroecological zones of the tropics. A broad array of applied cell and molecular techniques are increasingly being used worldwide to facilitate and enhance the handling and improvement of plantain and banana germplasm. Tissue culture is used for germplasm exchange, conservation and rapid multiplication, while in vitro seed germination (based on embryo culture or rescue) plays a critical role in generating hybrid plants. DNA marker systems have been developed in Musa to assist germplasm management, selection within the breeding pool or gene introgression from wild species, and for disease diagnosis. Likewise,...
Tipo: Journal article
Palavras-chave: Banana; Improvement; Micropropagation; DNA; Markers; Plantain.
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000100002

Optimization of phenoxazinone synthase production by response surface methodology and its application in Congo red decolourization
Provedor de dados: 69
Autores: Jia,Honghua; Gao,Zhen; Ma,Yingying; Zhong,Chao; Xie,Yingchun; Zhou,Hua; Wei,Ping.
Background: Enzymatic decolourization has been recently proposed as a promising and eco-friendly method for treatment of synthetic dye-contaminated wastewaters. However, the processes require large quantities of enzymes, attracting significant attention in developing efficient methods for mass production of multifunctional enzymes. Several methods such as response surface methodology (RSM) and orthogonal experiment have been applied to optimize the parameters in bioprocesses for enzyme production. Results: In the present study, a laccase-like enzyme, phenoxazinone synthase (PHS) originated from Streptomyces antibioticus was recombinantly expressed in Escherichia coli BL21 (DE3). The production of PHS in E. coli BL21 was optimized by response surface...
Tipo: Journal article
Palavras-chave: Congo red; Decolourization; Laccase; Phenoxazinone synthase; Response surface methodology.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500002

Study on the relationship between intracellular metabolites and astaxanthin accumulation during Phaffia rhodozyma fermentation
Provedor de dados: 69
Autores: Xiao,Anfeng; Jiang,Xinglong; Ni,Hui; Yang,Qiuming; Cai,Huinong.
Background To study the relationship between intracellular anabolism and astaxanthin production, the influence of intracellular protein and fatty acids on astaxanthin production by four mutant Phaffia rhodozyma strains and their variations was investigated in this research. Results First, the content of astaxanthin in cells showed a reverse fluctuation in contrast to that of protein during the whole fermentation process. Moreover, compared with the three other strains, the astaxanthin-overproducing mutant strain of the yeast P. rhodozyma, called JMU-MVP14, had the highest specific productivity of astaxanthin as 6.8 mg/g, whereas its intracellular protein and fatty acid contents were the lowest. In addition, as a kind of sugar metabolic product, ethanol was...
Tipo: Journal article
Palavras-chave: Astaxanthin; Ethanol; Fatty acids; Phaffia rhodozyma; Protein.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300002

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

Superparamagnetic Poly (3-hydroxybutyrate-co-3 hydroxyvalerate) (PHBV) nanoparticles for biomedical applications
Provedor de dados: 69
Autores: Vilos,Cristian; Gutiérrez,Marlen; Escobar,Roberto A; Morales,Francisco; Denardin,Juliano C; Velasquez,Luis; Altbir,Dora.
Background: The progress in material science and the recent advances in biodegradable/biocompatible polymers and magnetic iron oxide nanoparticles have led to develop innovative diagnostic and therapeutic strategies for diseases based on multifunctional nanoparticles, which include contrast medium for magnetic resonance imaging, agent for hyperthermia and nanocarriers for targeted drug delivery. The aim of this work is to synthesize and characterize superparamagnetic iron oxide (magnetite), and to encapsulate them into poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanoparticles for biomedical applications. Results: The magnetite nanoparticles were confirmed by X-ray diffraction and exhibited a size of 22.3 ± 8.8 nm measured by transmission electron...
Tipo: Journal article
Palavras-chave: Hyperthermia; Magnetic resonance image; Magnetite; PHBV; Polymeric nanoparticles.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500008

Monitoring the threat of unintentional transgene flow into maize gene banks and breeding materials
Provedor de dados: 69
Autores: Mezzalama,Monica; Crouch,Jonathan H; Ortiz,Rodomiro.
The use of transgenic crops is steadily increasing around the world, led by soybean (based on total area) and maize (in terms of total number of countries). Transgenic maize is grown in at least 17 countries across four continents: Africa, America, Asia and Europe. The comprehensive global spread of transgenic maize has significant implications for organizations involved in germplasm conservation and genetic enhancement; particularly as some countries require a GMO-free declaration when receiving shipments of maize germplasm. This article describes the protocol used by the International Maize and Wheat Improvement Center (CIMMYT) for monitoring unintentional transgene flow in maize genebank and breeding plots. The protocol is based on polymerase chain...
Tipo: Journal article
Palavras-chave: Biosafety; Genetic integrity; Germplasm enhancement; GM-maize.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000200006

Semiquantitative analysis of genetically modified maize and soybean in food
Provedor de dados: 69
Autores: Cazzola,María Laura; Petruccelli,Silvana.
The aim of this study was to analyze quantitatively the presence of genetically modified organism in food with different composition and degree of processing. Total DNA was extracted by Dellaporta's method and GMO analysis was performed using two consecutives PCR reactions with specie specific primers (IVR and LE), screening primers (35S) and transgen specific primers (CRY and EPSPS). The quantification within the sensitivity establish by the EU was possible only in some foods (ice-cream, flours, soybean isolates and concentrates, starch). Samples with high lipid content or subjected to intense thermal treatments (such as some snacks, mayonnaise, creamy soup) could not be amplified mainly due to the presence of PCR inhibitors. Therefore the method was...
Tipo: Journal article
Palavras-chave: Bt maize; Genetically modified organisms; Semi-quantitative PCR; RR-soybean; Transgenic food.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300028

In vitro plant regeneration system for common bean (Phaseolus vulgaris): effect of N6-benzylaminopurine and adenine sulphate
Provedor de dados: 69
Autores: Gatica Arias,Andrés M; Muñoz Valverde,Jenny; Ramírez Fonseca,Pilar; Valdez Melara,Marta.
A method for regeneration of the commercially important common bean (Phaseolus vulgaris ) using N6-benzylaminopurine(BAP) and adenine sulphate (AS) was established. Embryogenic axes of the Costa Rican common bean cultivars Bribrí, Brunca, Guaymí, Huetar and Telire were cultured on Murashige and Skoog medium supplemented with 100 mgl-1 myo-inositol, 1 mgl-1 thiamine, 30 gl-1 sucrose, BAP (0, 5 and 10 mgl-1), AS (0, 20 and 40 mgl-1) and 8 gl-1 agar. Regardless of the concentration of BAP and AS in the induction medium, the number of shoots and leaves differed significantly among the common bean cultivars evaluated. The higher average of shoots was obtained for Brunca &gt; Telire &gt; Bribrí &gt; Guaymí &gt; Huetar. Moreover, independently of the cultivar,...
Tipo: Journal article
Palavras-chave: Common bean; In vitro culture; Morphogenesis; Phaseolus vulgaris L.; Plant growth regulators.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100006

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

Uniparental genetic systems: a male and a female perspective in the domestic cattle origin and evolution
Provedor de dados: 69
Autores: Di Lorenzo,Piera; Lancioni,Hovirag; Ceccobelli,Simone; Curcio,Ludovica; Panella,Francesco; Lasagna,Emiliano.
Over the last 20 years, the two uniparentally inherited marker systems, namely mitochondrial DNA and Y chromosome have been widely employed to solve questions about origin and prehistorical range expansions, demographic processes, both in humans and domestic animals. The mtDNA and the Y chromosome, with their unique patterns of inheritance, continue to be extremely important source of information. These markers played significant roles in farm animals in the evaluation of the genetic variation within- and among-breed strains and lines and have widely applied in the fields of linkage mapping, paternity tests, prediction of breeding values in genome-assisted selection, analysis of genetic diversity within breeds detection of population admixture, assessment...
Tipo: Journal article
Palavras-chave: Animal breeding; Bovine domestication; Cattle genetic diversity; Genetic resources; Genome-assisted selection; Inherited marker systems.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500010

Genomic variability in Vitis vinifera L. "Sangiovese" assessed by microsatellite and non-radioactive AFLP test
Provedor de dados: 69
Autores: Vignani,Rita; Scali,Monica; Masi,Elisa; Cresti,Mauro.
Microsatellite polymorphism analysis on 25 different "Sangiovese" accessions was carried out at eight microsatellite loci (VVS2, VVS4, VVS29, VVMD3, VVMD6, VVMD7, VVMD17 and VVMD21). In order to evaluate variability within the "Sangiovese" variety and to confirm variety identification, genotype analysis, allele distribution and pedigree information were processed with a DNA-automated sequencer running AlleleLinks software. DNA typing revealed three cases of genetic dissimilarity compared to registered "Sangiovese" clones and the divergent accessions thought to be different clones of the same variety. The divergent accessions were different from "Sangiovese" at four microsatellite loci (VVS2, VVS4, VVMD7 and VVMD21). An innovative non-radioactive...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100007

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

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

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

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

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

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

Transgenic trees and forestry biosafety
Provedor de dados: 69
Autores: Valenzuela,Sofía; Balocchi,Claudio; Rodríguez,Jaime.
The benefits from the development of transgenic trees are expected from the improvement of traits as growth and form, wood quality, industrial processes, disease and insect resistance, herbicide tolerance, ecological restoration, rooting ability, etc. One of the first reported field trials with genetically modified forest trees was established in Belgium in 1988 and the characteristic evaluated was herbicide tolerance in poplars. Since then, there have been more than 200 reported trials, involving at least 15 forest species. The majority of the field trials have been carried out in the USA (64%). More than 50% of the field trials are done with Populus species and the main target traits are herbicide tolerance (31%), followed by marker genes (23%) and...
Tipo: Journal article
Palavras-chave: Biosafety; Forestry biotechnology; GMOs; GM trees.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300031

Plant biotechnology and food security in Latin America and the Caribbean
Provedor de dados: 69
Autores: de la Riva,Gustavo A.
Agriculture is expected to feed an increasing population, forecasted to reach 8 billion by 2020, out of whom 6.7 billion will be in developing countries where the carrying capacity of agricultural lands will soon be reached. In Latin American and the Caribbean (LAC) countries, in spite of the abundance of natural resources and continued investments in development, poverty and food insecurity affect more than 55 percent of the rural population. Fifteen years ago, plant biotechnology comprised only a few applications of tissue culture, recombinant DNA technology and monoclonal antibodies. Today, genetic transformation, and marker-aided selection and breeding are just a few of the examples of the applications in crop improvement with profound implications for...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000100001

The True Meaning of Technology Transfer
Provedor de dados: 69
Autores: Glew,Robert H.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100005

QTL mapping for physiology, yield and plant architecture traits in cotton (Gossypium hirsutum L.) grown under well-watered versus water-stress conditions
Provedor de dados: 69
Autores: Saeed,Muhammad; Guo,Wangzhen; Ullah,Ihsan; Tabbasam,Nabila; Zafar,Yusuf; Mehboob-ur-Rahman,; Zhang,Tianzhen.
Increasing scarcity of irrigation water is a major threat to sustainable production of cotton (Gossypium hirsutum L.). Identifying genomic regions contributing to abiotic stress tolerance will help develop cotton cultivars suitable for water-limited regions through molecular marker-assisted breeding. A molecular mapping F2 population was derived from an intraspecific cross of the drought sensitive G. hirsutum cv. FH-901 and drought tolerant G. hirsutum cv. RH-510. Field data were recorded on physiological traits (osmotic potential and osmotic adjustment); yield and its component traits (seedcotton yield, number of bolls/plant and boll weight); and plant architecture traits (plant height and number of nodes per plant) for F2, F2:3 and F2:4 generations under...
Tipo: Journal article
Palavras-chave: Composite interval mapping; Cotton; Drought tolerance.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300003

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 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

Stable expression and characterization of a fungal pectinase and bacterial peroxidase genes in tobacco chloroplast
Provedor de dados: 69
Autores: Espinoza-Sánchez,Edward Alexander; Álvarez-Hernández,Marianela Hazel; Torres-Castillo,Jorge Ariel; Rascón-Cruz,Quintín; Gutiérrez-Díez,Adriana; Zavala-García,Francisco; Sinagawa-García,Sugey Ramona.
Background The high capacity of chloroplast genome response to integrate and express transgenes at high levels makes this technology a good option to produce proteins of interest. This report presents the stable expression of Pectin lyase (PelA gene) and the first stable expression of manganese peroxidase (MnP-2 gene) from the chloroplast genome. Results pES4 and pES5 vectors were derived from pPV111A plasmid and contain the PelA and MnP-2 synthetic genes, respectively. Both genes are flanked by a synthetic rrn16S promoter and the 3'UTR from rbcL gene. Efficient gene integration into both inverted repeats of the intergenic region between rrn16S and 3'rps'12 was confirmed by Southern blot. Stable processing and expression of the RNA were confirmed by...
Tipo: Journal article
Palavras-chave: Cell wall; Chloroplast genetic transformation; Hydrolytic enzyme; Nicotiana tabacum.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300004

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

Hydrothermal multivariable approach: Full-scale feasibility study
Provedor de dados: 69
Autores: Pérez-Elvira,Sara I; Fernández-Polanco,Fernando; Fernández-Polanco,María; Rodríguez,Pilar; Rouge,Philippe.
A process configuration combining thermal hydrolysis (TH) and anaerobic digestion (AD) of sludge has been studied with the objective of analysing the feasibility of the technology for full scale installations. The study has been performed through pilot scale experiments and energy integration considerations, and a scheme of the most profitable option is presented: thermal hydrolysis unit fed with 7% total solids (TS) secondary sludge, anaerobic digestion of the hydrolysed sludge together with fresh primary sludge, and a cogeneration unit to produce green electricity and provide hot steam for the thermal hydrolysis process. From a technical and practical point of view, the process scheme proposed is considered to be feasible. Based on the results of the...
Tipo: Journal article
Palavras-chave: Anaerobic digestion; Biogas; Sludge; Sludge properties; Thermal hydrolysis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400007

Molecular authentication of the traditional Chinese medicinal plant Angelica sinensis based on internal transcribed spacer of nrDNA
Provedor de dados: 69
Autores: Feng,Tu; Liu,Shuang; He,Xing-jin.
Traditionally, the authentication of the traditional Chinese medicines (TCM), Angelica sinensis, is based on slightly different morphological characters and complex compounds. Usually, those methods are simultaneously affected by several factors, leading to subtle and ambiguous results. In this study, the internal transcribed spacer (ITS) regions of A. sinensis and seven other Angelica species used as adulterants were sequenced. A pair of specific primers was designed from the polymorphic ITS regions to distinguish A. sinensis from the adulterants and regional substitutes. These ITS-derived primers amplified approximately 520 bp specific fragments from the adulterants, whereas no products was amplified with the DNA of A. sinensis. We tested eight...
Tipo: Journal article
Palavras-chave: Angelica sinensis; Internal transcribed spacer; Molecular authentication; Specific primers; Traditional Chinese medicine.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100009

Levans production by Gluconacetobacter diazotrophicus
Provedor de dados: 69
Autores: Molinari,María Laura; Boiardi,José Luis.
Background: Growth of Gluconacetobacter diazotrophicus with glucose as carbon an energy source has been extensively studied. However, there are no reports in the literature describing growth of G. diazotrophicus in cultures containing sucrose as carbon source. The first step in sucrose pathway and production of levans was investigated. Biomass, levans, gluconic acid and keto gluconic acids production and levansucrase activity were determined in cultures with different sucrose concentration and nitrogen sources. Results: The biomass production was maximal in cultures containing 100 g x L-1 sucrose and inorganic nitrogen. Gluconic acid production was observed under all conditions tested, at levels up to 9 g x L-1 in cultures with sucrose excess and...
Tipo: Journal article
Palavras-chave: Gluconic acid; Keto gluconic acids; Levans; Levansucrase; Sucrose metabolism.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300007

Sugarcane bagasse as feedstock for cellulase production by Trichoderma harzianum in optimized culture medium
Provedor de dados: 69
Autores: Rocha,Vanessa Alves Lima; Maeda,Roberto Nobuyuki; Santa Anna,Lidia Maria Melo; Pereira,Nei.
This work aimed at the production of cellulases from pretreated sugarcane bagasse by the filamentous fungus Trichoderma harzianum IOC 3844 and their application in the hydrolysis of this same substrate, for a future use in second-generation ethanol production. The production of cellulases was optimized, which resulted in high enzymatic activities after 42 hrs of process in an instrumented bioreactor (CMCase 27,017 U x L-1; FPase 1,225 U x L-1; and &amp;#946;-glucosidase 609 U x L-1). The enzymatic extract was concentrated by using a hollow fiber membrane filtration system. The concentrated extract was applied in the hydrolysis of pretreated sugarcane bagasse, after 28 hrs of enzymatic reaction, displaying a similar catalytic performance of that attained...
Tipo: Journal article
Palavras-chave: Electrophoresis; Enzymatic hydrolysis; Second generation ethanol; Trichoderma harzianum.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500012

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

Effect of glutaraldehyde biocide on laboratory-scale rotating biological contactors and biocide efficacy
Provedor de dados: 69
Autores: Laopaiboon,Lakkana; Phukoetphim,Niphaphat; Laopaiboon,Pattana.
The effect of glutaraldehyde, a commercial biocide widely used in paper and pulp industry, on the performance of laboratory-scale rotating biological contactors (RBCs) as well as biocide efficacy was studied. Biofilms were established on the RBCs and then exposed to 0 - 180 ppm glutaraldehyde at a dilution rate of 1.60 h-1. The results showed that the biofilms became acclimated to glutaraldehyde and eventually could degrade it. Acclimation to the biocide took longer at the higher biocide concentrations. The degree of biocide degradation and chemical oxygen demand (COD) removal depended on acclimation period, the presence of other organic matters and the amount of mineral salts available. Glutaraldehyde at up to 80 ppm had no effect on treatment efficiency...
Tipo: Journal article
Palavras-chave: Acclimation; Aldehyde biocide; Biofilm; RBC; Wastewater treatment.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400003

Genomic sequence derived simple sequence repeats markers A case study with Medicago spp.
Provedor de dados: 69
Autores: Mahalakshmi,Viswanathan; Aparna,P.; Ramadevi,S.; Ortiz,Rodomiro.
Simple sequence repeats (SSR) or micro-satellites are becoming standard DNA markers for plant genome analysis and are being used as markers in marker assisted breeding. De novo generation of micro-satellite markers through laboratory-based screening of SSR-enriched genomic libraries is highly time consuming and expensive. An alternative is to screen the public databases of related model species where abundant sequence data is already available. All the genomic sequences of Medicago from the public domain database were searched and analysed of di, tri, and tetra nucleotide repeats. Of the total of about 156,000 sequences which were searched, 7325 sequences were found to contain repeat motif and may yield SSR which will yield product sizes of around 200 bp....
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300007

Inhibition of attachment of some fouling diatoms and settlement of Ulva lactuca zoospores by film-forming bacterium and their extracellular products isolated from biofouled substrata in Northern Chile
Provedor de dados: 69
Autores: Silva-Aciares,Fernando; Riquelme,Carlos.
The biofouling of surfaces submerged in the marine environment includes primary colonization of the substrate by microorganisms including bacteria, microalgae, and microscopic reproductive propagules of macroorganisms such as algal zoospores. The present study reports the evaluation of the inhibitory potential of biofilms and extracellular products (EP) of the indigenous bacterium Alteromonas sp strain Ni1-LEM on the settlement of marine biofouling such as: (i) eight marine benthic diatoms and (ii) zoospores of the alga Ulva lactuca, as well as the germination of these zoospores and was compared with reference strains with proven antifouling properties, Halomonas marina (ATCC 25374) and Pseudoalteromonas tunicata. Highest antifouling activity was found for...
Tipo: Journal article
Palavras-chave: Alteromonas sp; Antifouling bacteria; Antifouling compounds; Diatoms; Marine microfouling; Ulva zoospores.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100006

Expression of RNA polymerase IV and V in Oryza sativa
Provedor de dados: 69
Autores: Moo,Leydi de Rocio Canche; González,Angela Kú; Rodríguez-Zapata,Luis Carlos; Suarez,Victor; Castaño,Enrique.
RNA polymerase IV and V are principal players in the RdDM pathway, where their current study has shown interaction of several factors that control DNA silencing of intergenic regions and siRNA production. DNA silencing is an important process during cell differentiation, nuclear structure and viral control. However, RNA pol IV and V are yet to be study in model monocot systems like Oryza sativa that can provide further information on genetic silence mechanism in plats. We show the expression pattern of these polymerases in tissues extracts of Oryza sativa. Detectable amounts of these polymerases are found in specific adult plant tissues and particularly expressed during somatic embryogenesis but not during early stages of normal embryo development. The use...
Tipo: Journal article
Palavras-chave: Oryza sativa; RNA pol IV; RNA pol V; Somatic embryogenesis; Zygotic embryogenesis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200009

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

Repetitive element palindromic PCR (rep-PCR) as a genetic tool to study interspecific diversity in Euphorbiaceae family
Provedor de dados: 69
Autores: Rampadarath,Sillma; Puchooa,Daneshwar; Bal,Subhasisa.
Background The classification of diversity in germplasm collections is important for plant breeding. The repetitive element palindromic-polymerase chain reaction (rep-PCR) technique was used to investigate inter-specific diversity within 17 species from the Euphorbiaceae family using REP and BOX primers. Results The agglomerative cluster analysis was used to evaluate the scoring data. BOX and REP gave amplification with polymorphism of 98.84% and 100% respectively. REP marker demarcated between the subgenus peltatae. Both markers confirmed Jatropha tanjorensis as a natural hybrid between Jatropha gossypifolia and Jatropha curcas. Five random sequences from the rep-PCR gels were chosen, cloned and sequenced. The blast results demonstrated that the amplified...
Tipo: Journal article
Palavras-chave: Euphorbiaceae; Genetic diversity; Jatropha; Mitochondrial genome; Rep-PCR.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600005

Enzymatic hydrolysis and fermentation of ultradispersed wood particles after ultrasonic pretreatment
Provedor de dados: 69
Autores: Revin,Victor; Atykyan,Nelli; Zakharkin,Denis.
Background: A study of the correlation between the particle size of lignocellulosic substrates and ultrasound pretreatment on the efficiency of further enzymatic hydrolysis and fermentation to ethanol. Results: The maximum concentrations of glucose and, to a lesser extent, di- and trisaccharides were obtained in a series of experiments with 48-h enzymatic hydrolysis of pine raw materials ground at 380-100 rpm for 30 min. The highest glucose yield was observed at the end of the hydrolysis with a cellulase dosage of 10 mg of protein (204 ±21 units CMCase per g of sawdust). The greatest enzymatic hydrolysis efficiency was observed in a sample that combined two-stage grinding at 400 rpm with ultrasonic treatment for 5-10 min at a power of 10 W per kg of...
Tipo: Journal article
Palavras-chave: Bioethanol; Ligsnocelluloses; Yeast Saccharomyces cerevisiae.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000200003

Isolation and identification of a cellulolytic bacterium from the Tibetan pig's intestine and investigation of its cellulase production
Provedor de dados: 69
Autores: Yang,Weiping; Meng,Fanxu; Peng,Jiayin; Han,Peng; Fang,Fang; Ma,Li; Cao,Binyun.
Background The Tibetan pig is a pig breed with excellent grazing characteristics indigenous to the Qinghai-Tibet plateau in China. Under conditions of barn feeding, 90% of its diet consists of forage grass, which helps meet its nutritional needs. The present study aimed to isolate and identify a cellulolytic bacterium from the Tibetan pig's intestine and investigate cellulase production by this bacterium. The study purpose is to provide a basic theory for the research and development of herbivore characteristics and to identify a source of probiotics from the Tibetan pig. Results A cellulolytic bacterium was isolated from a Tibetan pig's intestine and identified based on morphological, physiological, and biochemical characteristics as well as 16S rRNA...
Tipo: Journal article
Palavras-chave: Carboxymethyl cellulose; Cellulolytic bacterium; Fermentation conditions; Screening and identification; Tibetan pig.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600002

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

Optimization of culture conditions for exopolysaccharides production in Rhizobium sp. using the response surface method
Provedor de dados: 69
Autores: Pereira Duta,Flávia; Pessôa de França,Francisca; de Almeida Lopes,Léa Maria.
The combined effects of the processing parameters for exopolysaccharides production by Rhizobium sp. was studied using the experimental design and response surface methodology. The experiments were carried out using a fermenter with 20 L capacity, as the reactor. All processing parameters were online monitored. The temperature [(30 &amp;plusmn; 1)&amp;ordm;C] and pH value (7.0 &amp;plusmn; 0.1) were kept constant throughout the experimental time. As statistical tools, a complete 2³ factorial planning with central point and response surface were used to study the interactions among three relevant variables of the fermentation process: calcium carbonate concentration, aeration and agitation. The processing parameters setup for reaching a maximum response for...
Tipo: Journal article
Palavras-chave: Exopolysaccharides; Experimental design; Response surface method; Rhizobium sp.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400007

Medicinal Plants: A Re-emerging Health Aid
Provedor de dados: 69
Autores: Hoareau,Lucy; DaSilva,Edgar J.
Interest in medicinal plants as a re-emerging health aid has been fuelled by the rising costs of prescription drugs in the maintenance of personal health and well being, and the bioprospecting of new plant-derived drugs. Several issues as well as a range of interests and activities in a number of countries are dealt with. Based on current research and financial investments, medicinal plants will, seemingly, continue to play an important role as a health aid.
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000200002

Establishment of a pheasant (Phasianus colchicus) spermatogonial stem cell line for the production of interspecies germ line chimeras
Provedor de dados: 69
Autores: Kim,Jeong Hyun; Sharma,Neelesh; Kim,Sung Woo; Sodhi,Simrinder Singh; Ghosh,Mrinmoy; Kim,Nam Eun; Mongre,Raj Kumar; Oh,Sung Jong; Jeong,Dong Kee.
Background Spermatogonial stem cells (SSCs) are important for the production of interspecies germ line chimeras. The interspecies germ cell transfer technique has been suggested as a way to conserve endangered birds. Our objective was to develop a technique for restoring endangered birds by developing interspecies germ line chimeras between pheasant (Phasianus colchicus) and chicken (Gallus gallus) with SSCs. Results SSCs were isolated from the surgically removed testis of a pheasant. Growth conditions for pheasant SSCs were established by co-culturing STO (SIM mouse embryo-derived thioguanine and ouabain resistant) cells and pheasant SSCs. The colony-forming cells divided and proliferated stably to yield an established SSC line. Pheasant SSCs showed...
Tipo: Journal article
Palavras-chave: Endangered birds; In vitro culture; Recipient chicken embryos; SSC transplantation.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500004

Molecular modeling of manganese peroxidase from the lignin-degrading fungus Ceriporiopsis subvermispora and structural comparison with other peroxidases
Provedor de dados: 69
Autores: Canales,Mauricio; Lobos,Sergio; Vicuña,Rafael.
Ceriporiopsis subvermispora is a white-rot basidiomycete that produces several isoenzymes of manganese peroxidase (MnP· ). A cDNA of one of them (MnP13-1) has been isolated and sequenced. The deduced aminoacid sequence shows about 60% similarity with the MnPs from Phanerochaete chrysosporium. Based on the crystal structures of MnP and lignin peroxidase (LiP) from P. chrysosporium, and of a peroxidase from Arthromyces ramosus (ARP), we have modeled by homology the three dimensional structure of MnP13-1 using standard modeling procedures. Local molecular mechanics optimization performed in the region corresponding to the binding sites of Ca2+ and Mn2+ in MnP13-1 demonstrated that the stereochemistry and the geometry of binding are conserved in both MnPs. A...
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000200006

Plant regeneration of Anthurium andreanum cv Rubrun
Provedor de dados: 69
Autores: Vargas,Teresa E.; Mejías,Alexander; Oropeza,Maira; de García,Eva.
To establish an efficient regeneration system for Anthurium andreanum cv Rubrun, seeds from plant spadixes were germinated on a medium supplemented with 2.2 muM BA. After 2 weeks, 74% of the seeds germinated and four weeks later, micro-cuttings from these plantlets were subcultured on a medium containing 4.4 muM BA and 0.05 muM NAA. On average, 3.6 shoots per explant were obtained. Four weeks old in vitro plants from germinated seeds and the plantlets obtained from micro-cuttings, showed callus proliferation at the stem base. These tissues were subcultured on a medium supplemented with 8.9 muM BA and 2.7 muM NAA. After 6 weeks of culture, about 43.8 plantlets per square cm of callus were obtained. Anatomical studies showed the organogenic nature of these...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300010

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

High density process to cultivate Lactobacillus plantarum biomass using wheat stillage and sugar beet molasses
Provedor de dados: 69
Autores: Krzywonos,Magorzata; Eberhard,Thomas.
Background: Owing to the growing interest in biofuels, the concept of a biorefinery where biomass is converted to a variety of useful products is gaining ground. We here present how distillery waste is combined with a by-product from a sugar production, molasses, to form a medium for the growth of Lactobacillus plantarum with yields and biomass densities comparable with conventional industrial media. Such approach enables a cost-effective utilization of the problematic wastewater from ethanol and a by-product from sugar production. It is the first approach that attempts to find low-cost media for the production of Lactobacillus plantarum biomass. Results: This study suggests that sieved wheat stillage enriched by adding 1.77 g/l yeast extract and 10%...
Tipo: Journal article
Palavras-chave: Distillery wastewater; High density fermentation; Lactic acid bacteria; Lactobacillus plantarum; Sugar beet molasses; Wheat stillage.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200006

Genetic diversity analysis of rice cultivars (Oryza sativa L.) differing in salinity tolerance based on RAPD and SSR markers
Provedor de dados: 69
Autores: Kanawapee,Nantawan; Sanitchon,Jirawat; Srihaban,Pranee; Theerakulpisut,Piyada.
Thirty rice cultivars were evaluated for salinity tolerance during the seedling stage and were divided into five tolerance groups including tolerant (T), moderately tolerant (MT), moderately susceptible (MS), susceptible (S) and highly susceptible (HS) which comprised 5, 10, 9, 4 and 2 cultivars respectively. Genetic diversity of all rice cultivars was evaluated using random amplified polymorphic DNA (RAPD) and simple sequence repeats (SSR) markers. The cultivars were evaluated for polymorphisms after amplification with 20 random decamer primers and 20 SSR primer pairs. A total of 161 RAPD markers and 190 SSR alleles were produced which revealed 68.94% and 89.47% polymorphism respectively. Mean genetic similarity coefficient was 0.82 for RAPD and 0.70 for...
Tipo: Journal article
Palavras-chave: Genetic similarity; RAPD markers; Rice; Salinity tolerance; SSR markers.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600002

Screening for propagation suitability in vitro of different Cyclamen species
Provedor de dados: 69
Autores: Seyring,Martina; Ewald,Aloma; Mueller,Anke; Haensch,Klaus-Thomas.
In the present study we examined the possibility of propagating different Cyclamen species (C. africanum Boiss. and Reut., C. cilicium Boiss. and Heldr., C. coum Mill., C. hederifolium Ait., C. persicum Mill., C. purpurascens Mill.) including some of their subspecies and cultivars in vitro using explants of adult plants. For this purpose two protocols have been applied to eleven genotypes combined with mostly four explant types (placentas with ovules, leaves, petioles and peduncles). The use of these protocols has given rise to either somatic embryo-like structures and/or adventitious shoots in all genotypes. This way it was possible to propagate each of the examined genotypes in vitro using explants of adult plants in a time less than one year. These...
Tipo: Journal article
Palavras-chave: Propagation; Shoot regeneration; Somatic embryogenesis; Species.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400010

Evaluating Colombian Clostridium spp. Strains hydrogen production using glycerol as substrate
Provedor de dados: 69
Autores: Bernal,Mauricio; Tinoco,Lizeth K; Torres,Luz; Malagón-Romero,Dionisio; Montoya,Dolly.
Background: The ability for hydrogen production of 13 native strains of Clostridium spp. strains isolated from Colombian soil was evaluated using glycerol substrate. Glycerol to hydrogen conversion was investigated using a batch fermentation reactor and industrial glycerol source (50 g.l-1, pH 7.00). Results: The results were quantified regarding acids, hydrogen, biomass and solvent production. The selected strain gave good hydrogen over production output at 14.4 mmol H2.l-1, productivity 0.3167 mg H2.h-1 l-1 culture mediumand yield 0.1962 mol H2.mol-1 glycerol. A further fermentation assay a 4.0 liter batch reactor let to being 0.26 mg.l-1.h-1 after 18 hrs of fermentation. Logistic model, Luedeking-Piret model and Luedeking-Piret modified models were used...
Tipo: Journal article
Palavras-chave: Anaerobic fermentation biofuel Clostridium spp glycerol; Hydrogen mathematical model.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000200005

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

Visualisation of the microbial colonisation of a slow sand filter using an Environmental Scanning Electron Microscope
Provedor de dados: 69
Autores: Devadhanam Joubert,Esther; Pillay,Balakrishna.
The removal of contaminants in slow sand filters occurs mainly in the colmation layer or schmutzdecke - a biologically active layer consisting of algae, bacteria, diatoms and zooplankton. A ripening period of 6 - 8 weeks is required for this layer to form, during which time filter performance is sub-optimal. In the current study, an environmental scanning electron microscope was used to visualise the ripening process of a pilot-scale slow sand filter over a period of eight weeks. To achieve this, sand particles were removed at weekly intervals and observed for biofilm development. Biological mechanisms of removal in slow sand filtration are not fully understood. A visualisation of the colonisation process would enhance the knowledge and understanding of...
Tipo: Journal article
Palavras-chave: Biofilm; Microbial biodiversity; Schmutzdecke.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200014

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

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

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

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

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

Inhibitory effect of lotus seedpod oligomeric procyanidins on advanced glycation end product formation in a lactose-lysine model system
Provedor de dados: 69
Autores: Wu,Qian; Li,Shu-Yi; Yang,Ting; Xiao,Juan; Chu,Qian-Mei; Li,Ting; Xie,Bi-Jun; Sun,Zhi-Da.
Background Industrial food processing induces protein glycation modifications and toxic advanced glycation end products (AGEs) which affect human health. Therefore, it is of interest to monitor AGEs in food processing. The present study was carried out to investigate the influence of lotus seedpod oligomeric procyanidin (LSOPC) concentrations, solution pH value and metal ions on AGE formation by heat treatment of lactose-lysine model solutions. Ne-(carboxymethyl) lysine (CML), as one of the common AGEs was also determined by HPLC-MS/MS in this experiment. Results The results showed that LSOPC can inhibit the formation of AGEs effectively at higher concentrations, lower temperature, and it can reverse the promotion function of metal ions because of its high...
Tipo: Journal article
Palavras-chave: Advanced glycation end products (AGEs); Lactose; Lotus seedpod oligomeric procyanidins (LSOPC); Lysine; Maillard reaction.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200002

Identification of alternate dwarfing gene sources to widely used Dee-Gee-Woo-Gen allele of sd1 gene by molecular and biochemical assays in rice (Oryza sativa L.)
Provedor de dados: 69
Autores: Neeraja,Chirravuri Naga; Vemireddy,Lakshminarayana Reddy; Malathi,Surapaneni; Siddiq,Ebrahimali Abubacker.
After the success of IR8 and TN1, breeders depended heavily on these two rice cultivars for source of short stature led to the narrow genetic base to majority of present day rice varieties, as far as sd1 (semi-dwarf1) gene is concerned. In addition, analysis of genetic lineage of the majority of the cultivated rice varieties in tropical Asia reveals that sd1 from DGWG (Dee-Gee-Woo-Gen) is the major source of dwarfing gene. Such high amount of genetic homogeneity renders rice plants vulnerable to epidemic of diseases and insect pests. In the current study, we made an attempt to identify the alternate sources of DGWG allele of sd1 gene by characterizing 29 induced and 3 spontaneous dwarf accessions employing marker for DGWG allele of sd1 gene and exogenous...
Tipo: Journal article
Palavras-chave: Dee-Gee-Woo-Gen; Dwarfing gene; Gibberellic acid assay; Molecular marker; Rice; Sd1 gene.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300007

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

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

Molecular analysis of genetic stability in long-term micropropagated shoots of banana using RAPD and ISSR markers
Provedor de dados: 69
Autores: Lakshmanan,Venkatachalam; Reddampalli Venkataramareddy,Sreedhar; Neelwarne,Bhagyalakshmi.
A large number of micropropagated plantlets of banana, Musa acuminata var. Nanjanagudu Rasabale (NR), that were developed from axillary shoot bud explants over 10 years ago were screened for genetic variation, if any, using RAPD (Random Amplified Polymorphic DNA) and ISSR (Inter-Simple Sequence Repeats) markers. Of the 4000 in vitro plantlets, 11 were used for screening that involved shoot cultures with distinct variation in morphological characteristics (morphotypes). Similarly, the mother maintained in the field was also subjected for genetic analysis. Out of the 50 RAPD and 25 ISSR primers screened, 30 RAPD and 5 ISSR primers produced totally 424 clear, distinct and reproducible band classes resulting in a total of 5088 bands where the banding patterns...
Tipo: Journal article
Palavras-chave: Growth regulators; Musa; Protocol; Shoot cultures; Somaclonal variation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100010

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

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

Environmental and Industrial Biotechnology in Developing Countries
Provedor de dados: 69
Autores: Kryl,David.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300003

The power of 28 microsatellite markers for parentage testing in sheep
Provedor de dados: 69
Autores: Al-Atiyat,Raed M.
Background In sheep breeding, there are situations where relationships recorded at the farm among pedigrees such as parent-offspring, full-sibs or half-sibs need to be tested. A panel of 28 microsatellite (MST) markers was tested to provide accurate pedigree information and resolve the common problem of significant error in pedigree records in Merino sheep. Three different flocks of Australian Merino sheep were investigated. A private farm flock represents a flock with no record availability. Two other flocks were maintained under good managements of full keeping records and being selected for high and low parasite resistances. Results In the studied panel, eight MSTs provided an average of Polymorphic Information content (PIC) equal to 0.65 or more in...
Tipo: Journal article
Palavras-chave: Merino sheep; Paternity verification; Pedigree records; SSR markers.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200009

GMO-Technology and Malnutrition Public Sector Responsibility and Failure
Provedor de dados: 69
Autores: Potrykus,Ingo.
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300001

Isolation of the intracellular and extracellular polysaccharides of Ganoderma neojaponicum (Imazeki) and characterization of their immunomodulatory properties
Provedor de dados: 69
Autores: Nik Ubaidillah,Nik Hafizah; Abdullah,Noorlidah; Sabaratnam,Vikineswary.
Background The role of polysaccharides isolated from the Ganoderma species of fungi in innate immunity has recently become a topic of research. Although some work has been conducted concerning Ganoderma lucidum, the characteristics of polysaccharides isolated from Ganoderma neojaponicum (Imazeki) as immunomodulatory agents are largely unknown. The aims for this study were to isolate and characterize the intracellular polysaccharides (IPSs) and extracellular polysaccharides (EPSs) of G. neojaponicum from STR reactor. Results The production of EPS and IPS was optimized on day 4 of the cultivation time in 2 L STR reactor based on the amount of biomass yield, total carbohydrate, &amp;#946;-glucan and a-glucan content. Further analysis, both the EPSs and IPSs...
Tipo: Journal article
Palavras-chave: &amp;#946; -Glucan Acute oral toxicity Macrophage cell line Phagocytosis Stirred tank reactor Total carbohydrate.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300008

Effects of oligosaccharides from endophytic Fusarium oxysporum Dzf17 on activities of defense-related enzymes in Dioscorea zingiberensis suspension cell and seedling cultures
Provedor de dados: 69
Autores: Li,Peiqin; Luo,Haiyu; Meng,Jiajia; Sun,Weibo; Wang,Xiaohan; Lu,Shiqiong; Peng,Youliang; Zhou,Ligang.
Background Three oligosaccharides (EOS, WOS and SOS) were respectively prepared from the corresponding polysaccharides, namely exopolysaccharide (EPS), water-extracted mycelial polysaccharide (WPS) and sodium hydroxide-extracted mycelial polysaccharides (SPS) from the endophytic fungus Fusarium oxysporum Dzf17. In this study, the effects of EOS, WOS and SOS on the activities of the defense-related enzymes, namely phenylalanine ammonia lyase (PAL), polyphenoloxidase (PPO) and peroxidase (POD) in its host plant Dioscorea zingiberensis cultures were investigated. Results For the suspension cell cultures of D. zingiberensis, the highest PAL activity was induced by 0.5 mg/mL of WOS at 48 h after treatment, which was 4.55-fold as that of control. Both PPO and...
Tipo: Journal article
Palavras-chave: Endophytic fungus; Phenylalanine ammonia lyase; Peroxidase; Polyphenoloxidase; Polysaccharide.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000400003

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

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

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

Inter simple sequence repeats separate efficiently hemp from marijuana (Cannabis sativa L.)
Provedor de dados: 69
Autores: Hakki,Erdogan E; Kayis,Seyit A; Pinarkara,Emine; Sag,Ayla.
Cannabis sativa L. is a multiple-use plant that provides raw material for the production of seed oil, natural fiber for textiles, automotive and pulp industries. It has also been used in insulating boards, ropes, varnishes, animal feed, and as medicinal agents. Cannabis has potential to be used for phytoremediation: however, its cultivation is strictly controlled due to its psychoactive nature and usage in producing drugs such as marijuana, and hashish. In this study, psychoactive type Cannabis samples, which were seized from 23 different locations of Turkey, and nine hemp type Cannabis accessions, as well as an unknown accession were used. Our interest was to identify the genetic relatedness of the seized samples and to separate drug and hemp type plants....
Tipo: Journal article
Palavras-chave: Cluster analysis; Hemp; ISSR; Marijuana; Principle coordinate analysis.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400010

Plant protease inhibitors in control of phytophagous insects
Provedor de dados: 69
Autores: Lawrence,Paulraj K.; Koundal,Kripa Ram.
Plant proteinase inhibitors (PIs) have been well established to play a potent defensive role against predators and pathogens. Although diverse endogenous functions for these proteins has been proposed, ranging from regulators of endogenous proteinases to act as storage proteins, evidence for many of these roles is partial, or confined to isolated examples. On the other hand, many PIs have been shown to act as defensive compounds against pests by direct assay or by expression in transgenic crop plants, and a body of evidence for their role in plant defense has been accumulated consistently. The role and mechanism of action for most of these inhibitors are being studied in detail and their respective genes isolated. These genes have been used for the...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100014

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

Enhancement of wanlongmycin production by nitrogen ion beam implantation
Provedor de dados: 69
Autores: Zhang,Xiaoyong; Lin,Birun; Gao,Xiangyang; Shen,Huifang.
In an attempt to obtain an industrial strain with higher yield of wanlongmycin, the wild strain Streptomyces griseovariabilis GAAS2507 was mutated by a novel mutagen, nitrogen ion beam with energy of 20 kilo electron volts (KeV) and dose ranging from 7.80 x 10(14) to 2.86 x 10(15) ions/cm². One mutant strain WN939 was obtained. Its yield of wanlongmycin reached 271.24 µg/mL, which was 82.10% higher than that of the wild strain. The mutant strain WN939 was relatively stable for the production of wanlongmycin through six successive transfers of cultures and a repeat fermentation in a 30 L fermentor. In addition, the mutant strains were investigated and divided into five types by their colony phenotypes and production of wanlongmycin. Among them, three types...
Tipo: Journal article
Palavras-chave: Mutagen nitrogen ion beam implantation; Streptomyces griseovariabilis GAAS2057; Wanlongmycin.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100003

Improved isolation of good-quality total RNA from the optic stalk of Mud crab, Scylla paramamosain
Provedor de dados: 69
Autores: Zhu,Houze; Jiang,Keji; Zhang,Fengying; Zhang,Dan; Pi,Yan; Ma,Lingbo.
An improved and efficient protocol was developed based on the TaKaRa RNAiso Plus Kit (Code: D9108A) for isolating good-quality total RNA from the optic stalk of mud crab, Scylla paramamosain. The protocol was based on the Trizol method with modifications. The carapace overlapping the optic stalk was retained with RNA in regular protocol. In order to remove the abundant deposition correlative with the carapace which makes the isolation of RNA particularly difficult, 5M potassium acetate solution (pH = 6.0) was added before the precipitation of RNA, and the temperature of RNA deposition was also decreased to -70ºC to ensure the stabilization of RNA. Good-quality total RNA from the optic stalk of S. paramamosain could be easily isolated with this modified...
Tipo: Journal article
Palavras-chave: Optic stalk; Potassium acetate; RNA isolation; Scylla paramamosain.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200005

Efficient transformation of Penicillium chrysogenum mediated by Agrobacterium tumefaciens LBA4404 for cloning of Vitreoscilla hemoglobin gene
Provedor de dados: 69
Autores: Sun,Chuan-Bao; Kong,Qiu-Lian; Xu,Wen-Si.
The vgb and bleomycin resistance genes could be efficiently transferred into the filamentous fungus Penicillium chrysogenum under help of T-DNA of Agrobacterium tumefaciens LBA4404 and the transferred genes were integrated at a chromosomal locus of P. chrysogenum. Transformation using A. tumefaciens LBA4404 could be enhanced in the presence of acetosyringone (AS) when being carried out in the conidiaand mycelium. The efficiencies of transformation could be improved up to 10 folds compared with conventional techniques for transformation of P. chrysogenum protoplasts.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100009

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

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

Encouraging generic skills in science courses
Provedor de dados: 69
Autores: Johnson,Elizabeth; Herd,Susanna; Tisdall,Judith.
Generic skills are skills that are common to all graduates rather than specific for a particular field of study. They include communication and problem-solving skills and the ability to work successfully in teams. To produce graduates with these skills, university courses must include exercises that encourage development of these skills and assessment procedures which reward achievement in these areas. This paper describes three simple exercises designed to develop generic skills that can easily be incorporated into existing courses.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200004

The influence of centrifugation on Zymomonas mobilis aggregation
Provedor de dados: 69
Autores: Perez Fernandez Palha,María de los Angeles; Edison Lopes,Carlos; Gomes de Andrade Lima,Maria Alice; Pereira Junior,Nei.
Flocculent Zymomonas mobilis breaks down in smaller flocs and individual cells when centrifuged. The main consequence of it is an increase in the dispersion of the sample, suggesting that the influence of the centrifugal force on the aggregation of cells is worth to study. The experiments showed that the degree of dispersion varied between 30% and 100% when the centrifugal acceleration changed from 25 g to 2500 g. Observation under the electronic microscope showed that a slimy material covered the cells recovered by gentle gravitational settling and, that the centrifuged cells presented a bare cell wall.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300011

Optimization of the citric acid production by Aspergillus niger through a metabolic flux balance model
Provedor de dados: 69
Autores: Guebel,Daniel V.; Torres Darias,Néstor V.
Idiophase, the citric acid producing stage of Aspergillus niger was mathematically modeled to identify required genetic manipulations to optimize citric acid production rate. For this reason, a consistent picture of cell functioning had to be achieved. The transient idiophase nature was established by stoichiometric analysis. The main intracellular fluxes were computed by application of material and physiological constraints (ATP, reduction equivalents, proton motive force) at culture time 120 hours. The HMP pathway accounts for 16% of the glucose input (carbon basis), the Krebs cycle for 13% and the citric acid synthesis for the remaining 71%. This profile implies an operative glycerol-P shuttle. It recycles 93% of the cytosolic glycerol-P to cytosolic...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000100001

Safe use of genetically modified lactic acid bacteria in food: Bridging the gap between consumers, green groups, and industry
Provedor de dados: 69
Autores: Sybesma,Wilbert; Hugenholtz,Jeroen; de Vos,Willem M.; Smid,Eddy J.
Within the European Union (EU), the use of genetically modified organisms (GMOs) in food production is not widely applied and accepted. In contrast to the United States of America, the current EU legislation limits the introduction of functional foods derived from GMOs that may bring a clear benefit to the consumer. Genetically modified lactic acid bacteria (GM-LAB) can be considered as a different class of GMOs, and the European Union is preparing regulations for the risk assessment of genetically modified microorganisms. Since these procedures are not yet implemented, the current risk assessment procedure is shared for GMOs derived from micro organisms, plants, or animals. At present, the use of organisms in food production that have uncontrolled genetic...
Tipo: Journal article
Palavras-chave: Lactic acid bacteria; Genetic modification; Legislation; Novel foods; Safety assessment.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400011

In vitro fruit trees rooting by Agrobacterium rhizogenes wild type infection
Provedor de dados: 69
Autores: Damiano,Carmine; Monticelli,Simona.
Agrobacterium rhizogenes infection at the base of microcuttings in vitro can improve the rooting of some fruit species. A study was carried out comparing rooting of almond, apple, plum, Pyrus pyraster and two hybrid rootstocks, when infected with A. rhizogenes strain 1855, with and without the addition of hormones. Three responses occurred: genotypes rooted without auxins; genotypes rooted only with auxins; genotypes rooted only after infection. All genotypes rooted after bacterial infection. In the first group the auxins increased rooting percentages. No substantial differences were found with and without infection in hormone free media, while the rooting percentages tended to decrease with the combination auxin/infection. In the second group, infection...
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000300008

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

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

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

Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities
Provedor de dados: 69
Autores: Villena,Gretty K; Gutiérrez-Correa,Marcel.
Lignocellulolytic enzyme production by Aspergillus niger was compared both in submerged fermentation (SF) and biofilm fermentation (BF) at varying water activities. Maximal filter paper activity, endoglucanase and xylanase activities were much higher in BF (2.96, 4.7 and 4.61 IU ml-1, respectively) than in SF cultures (1.71, 1.31 and 2.3 IU ml-1, respectively) but biomass yields were lower in BF than in SF (0.338 g g-1 and 0.431 g g-1, respectively). In the presence of 20% ethylene glycol (a w = 0.942) the enzyme activities decreased in both systems but BF still had higher levels (1.0, 1.0 and 2.6 IU ml-1, respectively) than SF cultures (0.6, 0.7 and 1.5 IU ml-1, respectively). An increase in xylanase specific activity of more than 2 fold (from 4.2 to 10.2...
Tipo: Journal article
Palavras-chave: Biofilm; Cellulase; Ethylene glycol; Water activity; Xylanase.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100012

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

Minibioreactor-gas collector for determining bacteria-produced hydrogen sulfide
Provedor de dados: 69
Autores: Hernández García,Armando; Pimentel Vázquez,Eulogio; Mena Campos,Jesús.
A simple and economical minibioreactor-gas collector system for determination of hydrogen sulfide produced by a microorganism was designed. The detection of hydrogen sulfide was based on the reaction between the hydrogen sulfide in the gas stream from the culture, and a lead acetate solution 0.090 mol/L, contained in a tube gas collector; the conductimetric back titration of lead excess was made, and hydrogen sulfide was quantified indirectly, being the detection limit 0.5 µmol. The developed system was applied using Tsukamurella paurometabola DSM 20162 as a model, being the amount of hydrogen sulfide produced, 1.2 µmol in 24 hrs.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300007

Gene expression and characterization of 2-keto-3-deoxy-gluconate kinase, a key enzyme in the modified Entner-Doudoroff pathway of Serratia marcescens KCTC 2172
Provedor de dados: 69
Autores: Lee,Yong-Seok; Park,In-Hye; Yoo,Ju-Soon; Kim,Hae-Sun; Chung,Soo-Yeol; Chandra,Muni Ramanna GariSubhosh; Choi,Yong-Lark.
We cloned 2-keto-3-deoxy-gluconate kinase (KDGK), which catalyzes the phosphorylation of 2-keto-3-deoxygluconate (KDG) to 2-keto-3-deoxy-6-phophogluconate (KDPG) from Serratia marcescens KCTC 2172. The nucleotide sequence revealed a single open reading frame containing 1,208 bp and encoding for 309 amino acids, with a molecular weight of 33,993 Da. The enzyme was purified via GST affinity chromatography. The putative KdgT binding site was detected upstream of the initial codon. The KDG kinase utilized 2-ketogluconate (KG) and KDG as substrates. The optimal temperature and pH for KDGK activity were 50ºC and 8.0, respectively.
Tipo: Journal article
Palavras-chave: 2-keto-3-deoxygluconate kinase; Carbohydrate kinase; Purification; Serratia marcescens KCTC 2172.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300005

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

The use of chitosan in protecting wooden artifacts from damage by mold fungi
Provedor de dados: 69
Autores: El-Gamal,Rehab; Nikolaivits,Efstratios; Zervakis,Georgios I; Abdel-Maksoud,Gomaa; Topakas,Evangelos; Christakopoulos,Paul.
Background: Many buildings in Egypt e.g. museums, mosques and churches, do not possess controlled environments for minimizing the risks of damage of wooden artifacts due to the growth of fungi. Fungal damage usually appears as change in wood color, appearance of stains, and sometimes deformation of wooden surfaces. In this study we focused on the effect that some fungi exert on the properties of wooden artifacts and evaluated the effectiveness of different concentrations of chitosan on their protection against damage by mold fungi. Results: Samples were collected from different monuments and environments, and fungi growing on them were isolated and identified. The isolated Penicillium chrysogenum, Aspergillus flavus and /Aspergillus niger strains were used...
Tipo: Journal article
Palavras-chave: Archeological wood; Chitosan protection; Crystallinity index; Damage of wooden artifacts; Filamentous fungi; FTIR; Fungal damage; Prevention of fungal growth; UV spectrophotometry; Wood deterioration; XRD.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600011

Performance of biofilm carriers in anaerobic digestion of sisal leaf waste leachate
Provedor de dados: 69
Autores: Mshandete,Anthony Manoni; Björnsson,Lovisa; Kivaisi,Amelia Kajumulo; Rubindamayugi,Mugassa Steven Thomas; Mattiasson,Bo.
Three methanogenic biofilm bioreactors were studied to evaluate the performance of three types of carriers. The carrier material were consisted of sisal fibre waste, pumice stone and porous glass beads, and the bioprocess evaluated was the methanogenesis anaerobic digestion of sisal leaf waste leachate. Process performance was investigated by increasing the organic loading rate (OLR) step-wise. The best results were obtained from the bioreactor packed with sisal fibre waste. It had the highest chemical oxygen demand (COD) removal efficiencies in the range of 80-93% at OLRs in the range of 2.4-25 g COD L-1d-1. The degradation pattern of volatile fatty acids (VFAs) showed that the degradation of propionate was limiting at higher OLRs. The stable pH and...
Tipo: Journal article
Palavras-chave: Biogas; Methanogenesis; Packed-bed bioreactors; Packing media.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100009

Towards genetic transformation of local onion varieties
Provedor de dados: 69
Autores: Marinangeli,Pablo; Deluchi,Bernardo; Ríos,Raúl; Franzone,Pascual; Galmarini,Claudio; Rosselló,Fernando; Curvetto,Néstor.
The aim of this work was to explore the possibility of obtaining transgenic plants of onion varieties cultivated in Argentina, starting from calli induced from mature zygotic embryos, using two strains of Agrobacterium tumefaciens as transfection vectors. Mature embryos from three varieties of 'Valenciana' onion, Torrentina, Cobriza INTA and Grano de oro were in vitro cultivated for callus induction. After three to four months an average of 57.4% success for the three varieties was reached. Transformation was carried out with Agl1 or LBA 4404 A. tumefaciens strains, both carrying a binary vector containing the marker gene gus a and the selection gene nptII. Selection was done in callus induction medium containing 10 mgL-1 geneticin during three...
Tipo: Journal article
Palavras-chave: Agrobacterium tumefaciens; Allium cepa L.; Callus; Zygotic embryos.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300030

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

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

The commercialization of bioinformatics
Provedor de dados: 69
Autores: Jones,Phillip B.C.
Biological research has experienced a paradigm shift from in vivo or in vitro experimentation to in silico experimentation, a development that relies upon bioinformatics. The beginning of bioinformatics stems from the fortuitous timing of the adoption of new DNA sequencing methods and the availability of mini-and bench-top computers, which became the tools to store and to analyze the sequence data. Another fortunate coincidence was the popularization of the Internet, which provided a means to exchange sequence data and sequence analysis software, and the establishment of the Human Genome Project, which stimulated the need for sophisticated data management and analysis tools. Market pull has rapidly stimulated bioinformatics commercialization as...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000200002

Vaccines for finfish aquaculture: What do we need to know to make them work?
Provedor de dados: 69
Autores: Dixon,Brian.
Aquaculture still faces serious economic impacts due to the loss of animals to disease. A conservative estimate of 5% losses due to disease means that the finfish aquaculture industry loses over $1 billion annually on a global scale. One proven way to prevent costly disease outbreaks is to vaccinate fish against common or known pathogens. Current vaccination schemes still result in losses, however, and this may be due in part to vaccine design. Vaccines are currently designed using state of the art knowledge of immune responses, which is based primarily on mammalian studies. Just how applicable is this information to fish immunity and vaccine design, however? This review discusses what is currently known for teleost fish about two key processes that drive...
Tipo: Journal article
Palavras-chave: Antibody; Antigen presentation; Cloning; Cytokine; Immunity; Major histocompatibility complex receptors.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500014

The use of dried spent yeast as a low-cost nitrogen supplement in ethanol fermentation from sweet sorghum juice under very high gravity conditions
Provedor de dados: 69
Autores: Sridee,Worawut; Laopaiboon,Lakkana; Jaisil,Prasit; Laopaiboon,Pattana.
Dried spent yeast (DSY) was used as a low-cost nitrogen supplement for ethanol fermentation from sweet sorghum juice under very high gravity (VHG) conditions by Saccharomyces cerevisiae NP 01. The fermentation was carried out at 30ºC in a 5-litre bioreactor. The results showed that DSY promoted ethanol production efficiencies. The ethanol concentration (P), productivity (Qp) and yield (Yp/s) of the sterile juice (total sugar of 280 g l-1) supplemented with 8 g l-1 of DSY were not different from those supplemented with yeast extract and/or peptone at the same amount. The initial yeast cell concentration of 5 x 10(7) cells ml-1 was found to be optimal for scale-up ethanol production. In addition, an increase in sugar concentration in inoculum preparation...
Tipo: Journal article
Palavras-chave: Bioethanol; Dried spent yeast; Scale-up; Sweet sorghum juice; Very high gravity fermentation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600003

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

Isolation of total RNA from hard bamboo tissue rich in polyphenols and polysaccharides for gene expression studies
Provedor de dados: 69
Autores: Rai,Vineeta; Ghosh,Jayadri Sekhar; Dey,Nrisingha.
RNA isolation from hard and woody internodal bamboo (Bambusa balcooa) tissue is very difficult due to the presence of secondary metabolites, polysaccharides, and polyphenolics. These compounds often co-precipitate with isolated RNA and hinder downstream applications. We have developed an efficient, cost effective and reproducible RNA isolation method from hard tissue of bamboo internode. This protocol includes an additional organic solvent refinement steps to remove endogenous phenolic compounds and acidic phenol (pH 4.2) to critically stabilize RNA in extraction buffer. In addition to these, two 2M Lithium chloride washing steps were introduced to eliminate DNA and polysaccharides contamination. The RNA isolated from the present protocol was found to be...
Tipo: Journal article
Palavras-chave: Acid phenol; Bambusa balcooa; Fiber specific genes; Internode; RNA extraction.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500022

Mapping aluminum tolerance loci in cereals: A tool available for crop breeding
Provedor de dados: 69
Autores: Inostroza-Blancheteau,Claudio; Soto,Braulio; Ibáñez,Cristian; Ulloa,Pilar; Aquea,Felipe; Arce-Johnson,Patricio; Reyes-Díaz,Marjorie.
Aluminum (Al) toxicity is the main factor limiting crop productivity in acidic soils around the world. In cereals, this problem reduces crop yields by 30-40%. The use of DNA-based markers linked to phenotypic traits is an interesting alternative approach. Strategies such as molecular marker-assisted selection (MAS) in conjunction with bioinformatics-based tools such as graphical genotypes (GGT) have been important for confirming introgression of genes or genomic regions in cereals but also to reduce the time and cost of identifying them through genetic selection. These biotechnologies also make it possible to identify target genes or quantitative trait loci (QTL) that can be potentially used in similar crops to increase their productivity. This review...
Tipo: Journal article
Palavras-chave: Aluminum tolerance; ALMT1; Cereals; Marker-assisted selection; Organic acid.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400011

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

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

Sunflower storage proteins are transported in dense vesicles that contain proteins homologous to the pumpkin vacuolar sorting receptor PV 72
Provedor de dados: 69
Autores: Molina,María Isabel; Otegui,Marisa; Petruccelli,Silvana.
Storage proteins are transported to a special storage compartments in seeds by Golgi dependent or independent pathways depending on the plant species. The aim of this work was to study the sunflower storage protein transport pathway and identified component of the sorting machinery. Immature sunflower seeds were analyzed by subcellular fractionation (using percoll and sucrose gradients) and electron microscopy. The vesicles isolated with percoll, have precursors of 11S globulins, &amp;#945;-TIP, &amp;#948;-TIP, BiP, and two proteins that have homology to the pumpkin vacuolar sorting receptor PV72. Sucrose isolated vesicles have the same composition than percoll ones, except for the lack of BiP and the presence of only one protein that has reactivity with...
Tipo: Journal article
Palavras-chave: Developing sunflower seeds; Storage proteins; Transport pathway; Vacuolar sorting; Vacuolar sorting receptor.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300029

Production and characterization of algae extract from Chlamydomonas reinhardtii
Provedor de dados: 69
Autores: Kightlinger,Weston; Chen,Kai; Pourmir,Azadeh; Crunkleton,Daniel W; Price,Geoffrey L; Johannes,Tyler W.
Background: Algae offer many advantages as biofuel sources including: high growth rates, high lipid content, the ability to grow on non-agricultural land, and the genetic versatility to improve strains rapidly and produce co-products. Research is ongoing to make algae biofuels a more financially attractive energy option; however, it is becoming evident that the economic viability of algae-based fuels may hinge upon high-value co-products. This work evaluated the feasibility of using a co-product, algae extract, as a nutrient source in cell culture media. Results: Algae extract prepared from autolysed Chlamydomonas reinhardtii was found to contain 3.0% protein, 9.2% total carbohydrate, and 3.9% free &amp;#945;-amino acid which is similar to the nutrient...
Tipo: Journal article
Palavras-chave: Algae extract Algae; Chlamydomonas reinhardtii; Microalgae; Culture media.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100003

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

In vivo assessment of possible probiotic properties of Zymomonas mobilis in a Wistar rat model
Provedor de dados: 69
Autores: Azerêdo,Geíza Alves de; Stamford,Tânia Lúcia Montenegro; Souza,Evandro Leite de; Veras,Flávio Fonseca; Almeida,Edvaldo Rodrigues de; Araújo,Janete Magali de.
In recent years the incorporation of probiotic bacteria into foods has received increasing scientific interest for health promotion and disease prevention. The safety and probiotic properties of Zymomonas mobilis CP4 (UFPEDA-202) was studied in a Wistar rat model fed the 10(9) colony forming units (cfu)/mL-1 of the assayed strain for 30 days. No abnormal clinical signs were noted in the group receiving viable cells of Z. mobilis and water (control) during the period of the experiment. There were no significant difference (p &gt; 0.05) in feed intake and weight gain among mice fed the Z. mobilis in comparison to the control group. No bacteria were found in blood, liver and spleen of any animals. Mice receiving Z. mobilis showed significantly differences (p...
Tipo: Journal article
Palavras-chave: Health benefit; Safety; Zymomonas mobilis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000200003

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

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

Evaluation of antimicrobial activity and cell viability of Aloe vera sponges
Provedor de dados: 69
Autores: Gontijo,Sávio Morato de Lacerda; Gomes,Alinne Damásia Martins; Gala-García,Alfonso; Sinisterra,Rubén Dario; Cortés,Maria Esperanza.
Background: Aloe vera L., member of the Liliaceae family, has been shown to stimulate cell proliferation and contribute to healing and angiogenesis, has anti-bacterial, anti-fungal and anti-inflammatory activity. In addition, Aloe vera can be used as a support for drug transport. Our objective is to evaluate antimicrobial activity and cytotoxicity of sponges of Aloe vera L. for use as a carrying support of drugs. Results: In this work, sponge of free Aloe vera (AV) loaded with amoxicillin (AMX) or nystatin (NYS) at 1% w/w, were prepared and physico-chemically characterized via X-ray diffraction, Fourier Transform Infrared Spectroscopy and thermal analysis. Antimicrobial potency of AV sponge alone, loaded with AMX or NYS, against strains of Streptococcus...
Tipo: Journal article
Palavras-chave: Amoxicillin; Cytotoxicity; Drug transport; Nystatin.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000100002

Strategy of oxygen transfer coefficient control on the L-erythrulose fermentation by newly isolated Gluconobacter kondonii
Provedor de dados: 69
Autores: Pan,Long; Fang,Ya-kun; Zhou,Pei; Jin,Kui-qi; Gang,Wang; Liu,Yu-peng.
Background: The effect of diverse oxygen transfer coefficient on the L-erythrulose production from meso-erythritol by a newly isolated strain, Gluconobacter kondonii CGMCC8391 was investigated. In order to elucidate the effects of volumetric mass transfer coefficient (K La) on the fermentations, baffled and unbaffled flask cultures, and fed-batch cultures were developed in present work. Results: With the increase of the K La value in the fed-batch culture, L-erythrulose concentration, productivity and yield were significantly improved, while cell growth was not the best in the high K La. Thus, a two-stage oxygen supply control strategy was proposed, aimed at achieving high concentration and high productivity of L-erythrulose. During the first 12 h, Klawas...
Tipo: Journal article
Palavras-chave: K La; Industrial biotechnology; Process control; Production; Tanning agents; Tanning properties; Artificial tanning; Dihydroxypropanone (DHA); Production of L-erythrulose; Meso-erythritol; Biosynthesis of L-erythrulose.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600004

The genetic dissection of quantitative traits in crops
Provedor de dados: 69
Autores: Semagn,Kassa; Bjørnstad,Åsmund; Xu,Yunbi.
Most traits of interest in plant breeding show quantitative inheritance, which complicate the breeding process since phenotypic performances only partially reflects the genetic values of individuals. The genetic variation of a quantitative trait is assumed to be controlled by the collective effects of quantitative trait loci (QTLs), epistasis (interaction between QTLs), the environment, and interaction between QTL and environment. Exploiting molecular markers in breeding involve finding a subset of markers associated with one or more QTLs that regulate the expression of complex traits. Many QTL mapping studies conducted in the last two decades identified QTLs that generally explained a significant proportion of the phenotypic variance, and therefore, gave...
Tipo: Journal article
Palavras-chave: Association mapping; Linkage disequilibrium; Markers assisted selection; Molecular breeding; Molecular markers; Quantitative trait; QTL mapping; QTL analysis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500016

Effects of 5-aminolevulinic acid (ALA)-containing supernatants from selected Rhodopseudomonas palustris strains on rice growth under NaCl stress, with mediating effects on chlorophyll, photosynthetic electron transport and antioxidative enzymes
Provedor de dados: 69
Autores: Nunkaew,Tomorn; Kantachote,Duangporn; Kanzaki,Hiroshi; Nitoda,Teruhiko; Ritchie,Raymond J.
Background: Rice is globally one of the most important food crops, and NaCl stress is a key factor reducing rice yield. Amelioration of NaCl stress was assessed by determining the growth of rice seedlings treated with culture supernatants containing 5-aminolevulinic acid (ALA) secreted by strains of Rhodopseudomonas palustris (TN114 and PP803) and compared to the effects of synthetic ALA (positive control) and no ALA content (negative control). Results: The relative root growth of rice seedlings was determined under NaCl stress (50 mM NaCl), after 21 d of pretreatment. Pretreatments with 1 &amp;#956;M commercial ALA and 10X diluted culture supernatant of strain TN114 (2.57 &amp;#956;M ALA) gave significantly better growth than 10X diluted PP803 supernatant...
Tipo: Journal article
Palavras-chave: 5-Aminolevulinic acid (ALA); Antioxidative enzymes; Chlorophyll fluorescence; Rhodopseudomonas palustris; Rice; Salinity.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100004

RNA editing in plant mitochondria, cytoplasmic male sterility and plant breeding.
Provedor de dados: 69
Autores: Araya,Alexandre; Zabaleta,Eduardo; Blanc,Valérie; Bégu,Dominique; Hernould,Michel; Mouras,Armand; Litvak,Simon.
RNA editing in plant mitochondria is a post-transcriptional process involving the partial change of C residues into U. These C to U changes lead to the synthesis of proteins with an amino acid sequence different to that predicted from the gene. Proteins produced from edited mRNAs are more similar to those from organisms where this process is absent. This biochemical process involves cytidine deamination. The cytoplasmic male sterility (CMS) phenotype generated by the incompatibility between the nuclear and the mitochondrial genomes is an important agronomical trait which prevents inbreeding and favors hybrid production. The hypothesis that RNA editing leads to functional proteins has been proposed. This hypothesis was tested by constructing transgenic...
Tipo: Journal article
Palavras-chave: Plant mitochondria; RNA editing; Cytidine deamination; Cytoplasmic male sterility (CMS; Fertility restoration.
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000100004

Influence of 2,4-D and BAP on callus growth and the subsequent regeneration of somatic embryos in long-term cultures of Pelargonium x domesticum cv. Madame Layal
Provedor de dados: 69
Autores: Haensch,Klaus-Thomas.
This long-term study demonstrates for the first time that it is possible to propagate embryogenic cultures in pelargoniums and to subsequently initiate the differentiation of embryos using the cultivar Madame Layal (Pelargonium x domesticum). Propagation of callus was only possible with combinations of 2,4-dichlorophenoxyacetic acid (2,4-D) and 6-benzylaminopurine (BAP), which gave rise to embryos from the primary culture stage on. However, the propagation of cells, as well as the differentiation of embryos, was inhibited by a continuous application of these growth regulators. For this reason, a long period on medium lacking growth regulators was necessary before the differentiation of embryos occurred again. The consequences for improving the propagation...
Tipo: Journal article
Palavras-chave: Auxin; Cytokinin; Propagation; Somatic embryogenesis.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100007

Prediction of xylanase optimal temperature by support vector regression
Provedor de dados: 69
Autores: Zhang,Guangya; Ge,Huihua.
Background: Support vector machine (SVM), a novel powerful machine learning technology, was used to develop the non-linear quantitative structure-property relationship (QSPR) model of the G/11 xylanase based on the amino acid composition. The uniform design (UD) method was applied to optimize the running parameters of SVM for the first time. Results: Results showed that the predicted optimum temperature of leave-one-out (LOO) cross-validation fitted the experimental optimum temperature very well, when the running parameter C, &amp;#958;, and &amp;#947; was 50, 0.001 and 1.5, respectively. The average root-mean-square errors (RMSE) of the LOO cross-validation were 9.53ºC, while the RMSE of the back propagation neural network (BPNN), was 11.55ºC. The...
Tipo: Journal article
Palavras-chave: Amino acid composition; Optimum temperature; Support vector machine; Uniform design; Xylanase.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100007

Identification and genetic diversity analysis of Memecylon species using ISSR, RAPD and Gene-Based DNA barcoding tools
Provedor de dados: 69
Autores: Tumkur Ramasetty,Bharathi; Naik Bajpe,Shrisha; Kigga Kadappa,Sampath Kumara; Kumar Saini,Ramesh; Nittur Basavaraju,Shashibhushan; Kukkundoor Ramachandra,Kini; Harishchandra Sripathy,Prakash.
Background: Memecylon species are commonly used in Indian ethnomedical practices. The accurate identification is vital to enhance the drug's efficacy and biosafety. In the present study, PCR based techniques like RAPD, ISSR and DNA barcoding regions, such as 5s, psbA-trnH, rpoC1, ndh and atpF-atpH, were used to authenticate and analyze the diversity of five Memecylon species collected from Western Ghats of India. Results: Phylogenetic analysis clearly distinguished Memecylon malabaricum from Memecylon wightii and Memecylon umbellatum from Memecylon edule and clades formed are in accordance with morphological keys. In the RAPD and ISSR analyses, 27 accessions representing five Memecylon species were distinctly separated into three different clades. M....
Tipo: Journal article
Palavras-chave: AtpF-atpH; Memecylon species; Ndh; PsbA-trnH; RpoC1; 5s; PCR based techniques; Molecular phylogenetic analysis; Molecular phylogenesis; DNA markers.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600001

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

Physiological-enzymatic characteristics and inoculation of mycelial strains of Descolea antarctica Sing. in Nothofagus seedlings
Provedor de dados: 69
Autores: Valenzuela,Eduardo; Hipp,Joseline; Alonso,Claudia; Godoy,Roberto; Alberdi,Miren; Alvarez,Maricel; Saavedra,Isabel.
At present, reforestation has focused on native forests with anthropogenic intervention and eroded soils. There is interest in producing Nothofagus seedlings which can overcome adverse conditions encountered on reforestation sites. It is necessary to find new fungi that can be utilized as mycorrhizal inoculants and that enable the seedlings to increase their tolerance to adverse conditions. Two ectomycorrhizal strains of the fungus Descolea antarctica (D1 and D2) were cultured at different temperatures, pH levels and the activities of amylases, cellulases, and phosphatases were determined. In greenhouse and nursery trials, the growth responses of inoculated Nothofagus obliqua seedlings were evaluated. D1 and D2 exhibited the highest growth rates at 23ºC....
Tipo: Journal article
Palavras-chave: Cellulose; Ectomycorrhizal fungi; Nothofagus; PH; Phosphatase; Temperature.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200012

Genetic differentiation between Cinta Senese and commercial pig breeds using microsatellite
Provedor de dados: 69
Autores: Scali,Monica; Vignani,Rita; Bigliazzi,Jacopo; Paolucci,Elisa; Bernini,Andrea; Spiga,Ottavia; Niccolai,Neri; Cresti,Mauro.
Background: Cinta Senese (CS) is an autochthonous Tuscan breed, which risked extinction since the ‘60s. Results: Monitoring the genetic variability of the actual population by use of DNA molecular markers is essential to address a correct breeding policy, finalized to obtain the race preservation and its fitness in the future. 17 SSRs autosomal markers and 1 associated to the X chromosome were used to genotype 86 individuals belonging to the CS and 12 belonging to two main white races Landrace (L), Large White (LW) and crosses between LW and L and L and CS widespread in Tuscany and used in the recent past to obtain hybrids with the CS. Conclusions: A dendrogram of similarity measures the relative genetic distance between individuals in the population. Data...
Tipo: Journal article
Palavras-chave: Cinta Senese; Genetic diversity; Genotyping; Microsatellites; Sus scrofa.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200001

Recombinant human granulocyte-macrophage colony-stimulating factor: effect of glycosylation on pharmacokinetic parameters
Provedor de dados: 69
Autores: Marini,Guillermo; Forno,Guillermina; Kratje,Ricardo; Etcheverrigaray,Marina.
The pharmacokinetic behaviour of the non-glycosylated, bacterially-derived recombinant human granulocyte-macrophage colony-stimulating factor (rhGM-CSF) and the glycosylated mammalian product was studied after intra and extra vascular administration of a single dose in rodents. Each route of administration gave a different rhGM-CSF concentration-time profile. After extra vascular administration of equivalent doses, a higher peak concentration and faster elimination were observed in the group treated with the E. coli-derived cytokine. The faster elimination resulted in a return to pre-treatment plasma levels after 12 hrs, versus 48 hrs following the administration of glycosylated rhGM-CSF. After intravascular administration, clearance of rhGM-CSF was...
Tipo: Journal article
Palavras-chave: Glycosylation; Pharmacokinetic parameters; RhGM-CSF.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200011

Elimination of TSWV from Impatiens hawkerii Bull. and regeneration of virus-free plant
Provedor de dados: 69
Autores: Milosevic,Snezana; Subotic,Angelina; Bulajic,Aleksandra; Djekic,Ivana; Jevremovic,Sladjana; Vucurovic,Ana; Krstic,Branka.
The possibility for obtaining virus free plants from Impatiens hawkerii Bull. shoots infected with Tomato spotted wilt virus (TSWV) through meristem-tip culture was examined. TSWV presence in I. hawkerii plants was detected by DAS-ELISA and RT-PCR and identification of the virus was confirmed by sequencing one of the chosen isolate (GenBank Accesion CQ132190). Meristem-tip explants (0.3-1.5 mm) from virus-infected shoots are cultured on MS media supplemented with different concentrations of the cytokinins, CPPU or TDZ (0.01-1.0 µM), respectively. Using this system, a large number of in vitro shoots could be produced from a single explant. Also, cytokinins showed a stimulatory effect on the length, fresh and dry weights of the newly formed shoots. Plant...
Tipo: Journal article
Palavras-chave: Meristem culture; New Guinea Impatiens; Tomato spotted wilt virus; Virus- free plants.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100003

Variety discrimination of Tigridia pavonia (L.f.) DC. assesed by different length RAPD primers
Provedor de dados: 69
Autores: Piña-Escutia,José Luis; Vázquez-García,Luis Miguel; Arzate-Fernández,Amaury Martín.
Tigridia pavonia (L.f.) DC. is one of the important phytogenetic resources of México. This species is used as ornamental, food and medicinal purposes. Despite its ornamental and economic potential, there is little information about the genetic variability. In this study, randomly amplified polymorphic DNA (RAPD) primers of 10, 15 and 20 bases were used to assess the level of genetic variation among nine botanical varieties of Tigridia pavoniacollected in three localities within State of México. The total number fragments, polymorphic fragments, percentage of polymorphism and resolving power were greater for 15 base (55, 52, 94.5 and 5, respectively) and 20 base (47, 45, 95.7 and 3.8, respectively), in comparison with those obtained from 10 base primers...
Tipo: Journal article
Palavras-chave: Genetic resources; RAPD; Tigridia pavonia; Variety discrimination.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400010

Recent developments in biotech industry outside of the USA and Western Europe: Report from BIO 2005
Provedor de dados: 69
Autores: Bourinbaiar,Aldar S.
The BIO 2005 international convention is the largest gathering of the biotech industry in the world. This year it was held on June 19-22 inside the behemoth Convention Center in downtown Philadelphia, bringing together 18,730 executives, investors, consultants, lawyers, politicians, scientists, and dreamers from 56 countries. More than 500 media representatives covered the event. Biotechnology research and findings presented by countries outside the USA and Western Europe has begun to make a significant impact on these annual BIO gatherings. The achievements of some of these countries are briefly reviewed.
Tipo: Journal article
Palavras-chave: Africa; Asia; Bioindustry; Biotech; Biodefense; Eastern Europe; Latin America; Pacific; Russia.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200002

Poly (l-lactide acid) improves complete nano-hydroxyapatite bone scaffolds through the microstructure rearrangement
Provedor de dados: 69
Autores: Shuai,Cijun; Nie,Yi; Gao,Chengde; Lu,Haibo; Hu,Huanlong; Wen,Xuejun; Peng,Shuping.
Cracks often occur when nano-hydroxyapatite bone scaffolds are fabricated with selective laser sintering, which affect the performance of scaffolds. In this study, a small amount of poly (l-lactide acid) (PLLA) was added into nano-hydroxyapatite (nano-HAP) powder by mechanical blending in order to improve the sintering properties. The nano-HAP powder combined with 1wt % PLLA was sintered under different laser power (5W, 7.5W, 10W, 12.5W, 15W and 20W). The fabricated scaffolds were characterized using Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Micro Hardness Tester. The results showed that nano-HAP particles grew up quickly with the laser power increasing, and there were many strip-like...
Tipo: Journal article
Palavras-chave: Hardness; Microstructure; Nano-hydroxyapatite; Thermal properties.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600004

Molecular cloning, expression and characterization of a serine proteinase from Japanese edible mushroom, Grifola frondosa: solving the structure - function anomaly of a reported aminopeptidase
Provedor de dados: 69
Autores: Islam,Mohammed M.
The N-terminal amino acid sequence of an aminopeptidase from Japanese edible mushroom, Grifola frondosa, was reported to have high similarity with that of a serine proteinase from basidiomycete, Agaricus bisporous (Nishiwaki and Hayashi, 2001). The full-length cDNA and the corresponding genomic DNA of the enzyme were cloned, based on the reported N-terminal amino acid sequence. The predicted open reading frame (ORF) of the cloned cDNA, encoding a product of 379 amino acids, was expressed in E. coli using pET expression vector. The expressed pro-enzyme (40 kDa) underwent autolysis to produce the mature protein (30 kDa) and a pro-peptide (10 kDa). The mature protein and the pro-peptide remained tightly bound to each other and could not be separated by Ni-NTA...
Tipo: Journal article
Palavras-chave: 5'-RACE; CDNA; Genomic DNA; Maitake; Refolding.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400010

New ammonia lyases and amine transaminases: Standardization of production process and preparation of immobilized biocatalysts
Provedor de dados: 69
Autores: Casablancas,Antoni; Cárdenas-Fernández,Max; Álvaro,Gregorio; Benaiges,Maria Dolors; Caminal,Glòria; Mas,Carles de; González,Glòria; López,Carmen; López-Santín,Josep.
Background: New enzymes for biotransformations can be obtained by different approaches including directed mutagenesis and in vitro evolution. These mutants have to be efficiently produced for laboratory research on bioreactions as well as for process development. In the framework of a European ERA-IB project, two different types of enzymes (ammonia lyases and aminotransferases) have been selected as biocatalysts for the synthesis of industrially relevant amines. New mutant enzymes have been obtained: a) aspartases able to recognize &amp;#946;-amino acids; b) &amp;#969;-transaminases with improved activity. The objectives are to find out a common operational strategy applicable to different mutants expressed in E. coli with the same initial genetic...
Tipo: Journal article
Palavras-chave: Amine transaminases; Ammonia lyases; E. coli; Fed-batch; Immobilized biocatalysts.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300004

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

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

Universal protocol for generating 100bp size standard for endless usage
Provedor de dados: 69
Autores: Natarajan,Chandrasekhar; Vijayan,Neetha N; Vaidyan,Linda Koshy; Mathew,Anila; Srinivas,Lekshmy; Banerjee,Moinak.
Developing countries are facing severe bottlenecks in the technological advancement in biotechnology, due to restrictions imposed by patent protected products and protocols. This calls for designing of simple and cost-effective alternatives for the indispensable products like DNA molecular weight markers. We demonstrate a novel, rapid and cost-effective method of making in-house 100bp ladder for routine use. In our method we use a single forward primer and five reverse primers designed on the backbone sequence of a commonly used vector template. These primers are used at a universal annealing temperature to amplify ten DNA fragments of accurate size ranging from 100bp to 1000bp. Our PCR-based method can provide size standards for an endless usage.
Tipo: Journal article
Palavras-chave: 100bp ladder; Cost effective; DNA size standards; Endless usage.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200015

Ethanol mediated enhancement in bacterial transformation
Provedor de dados: 69
Autores: Sharma,Arun Dev; Singh,Jaspreet; Gill,Prabhjot Kaur.
In molecular biology, transformation using E. coli as a host plays a key role in synthesizing gene libraries. The present study demonstrated a new ethanol-based method for transformation of plasmid DNA to E. coli. Ethanol at 10% concentration (v/v) showed best results. Further, as compared with traditional CaCl2 method, the transformation rate, using protocol outlined in this study, was very high, suggesting amenable for further applications.
Tipo: Journal article
Palavras-chave: Bacteria; Ethanol; Transformation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100016

LaNe RAGE: a new tool for genomic DNA flanking sequence determination
Provedor de dados: 69
Autores: Park,Daniel J.
The determination of genomic DNA sequence flanking a known region is often problematic. Existing technologies depend on multiple, efficient enzyme-catalysed preparative processing steps and/or rely on relatively inefficient ‘one-sided' PCR mechanisms. I demonstrate the application of a simple ‘two-sided' PCR-based approach, lariat-dependent nested PCR for rapid amplification of genomic DNA ends (LaNe RAGE), applied to the mouse GAPDH and PGK1 gene flanking sequences. This demonstration offers great promise in applications such as genome walking, transposon mutagenesis mapping and DNA fingerprinting
Tipo: Journal article
Palavras-chave: Cloning; DNA fingerprinting; Genomic DNA walking; PCR; Sequencing; Transposon mutagenesis.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200012

News from the International Council for Science: Strengthening international science for the benefit of society
Provedor de dados: 69
Autores: Cetto,Ana María.
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200001

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

Relationship between cultivation mode of white rot fungi and their efficiency for olive oil mill wastewaters treatment
Provedor de dados: 69
Autores: Alaoui,Sanae Mdaghri; Merzouki,Mohamed; Penninckx,Michel J; Benlemlih,Mohamed.
Four white rot fungi (WRF) strains, Phanerochaete chrysosporium, Trametes versicolor, Coriolopsis polyzona and Pycnoporus coccineus, were tested for efficiency of treatment of Olive Oil mill wastewaters (OOMW) in relation with their cultivation mode, i.e. under the form of free mycelium, mycelium immobilized in alginate beads and solid state cultivation on Petri dishes. Study of biodegradation of phenolic compounds, chemical oxygen demand (COD) decrease and decolourisation of OOMW have shown that Coriolopsis polyzona and Pycnoporus coccineus degradation performances were apparently only slightly affected by the cell cultivation procedures experienced here. In contrast, Phanerochaete chrysosporium and Trametes versicolor showed respectively marked...
Tipo: Journal article
Palavras-chave: Biotreatment; Cell immobilization; Olive oil mill wastewaters; White rot fungi.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400013

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

Total RNA quality of lyophilized and cryopreserved dormant grapevine buds
Provedor de dados: 69
Autores: García-Baldenegro,Claudia Vanessa; Vargas-Arispuro,Irasema; Islas-Osuna,María; Rivera-Domínguez,Marisela; Aispuro-Hernández,Emmanuel; Martínez-Téllez,Miguel Ángel.
Background Plant tissues must be preserved in their collection state, especially for genome-wide expression profile studies. Lyophilization is a feasible, affordable tool when fresh tissues cannot be shipped at ultralow temperatures from their origin to the place of analysis. In this study, the total RNA quality of dormant grapevine buds (Vitis vinifera L. cv. ‘Flame Seedless’) of freeze-dried samples stored at room temperature conditions was evaluated and compared to that of cryopreserved (-80°C) grapevine buds. Results Good yield and quality of RNA were obtained from freeze-dried dormant buds stored at room temperature for 0, 3 and 6 weeks after they were lyophilized. Further experiments confirmed that the extracted total RNA could be used for actin and...
Tipo: Journal article
Palavras-chave: Freeze-dried; RNA integrity number; RT-qPCR; Vitis vinifera L; Woody tissue.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200012

Semi-quantitative detection of genetically modified grains based on CaMV 35S promoter amplification
Provedor de dados: 69
Autores: Tozzini,Alejandro C.; Martínez,M. Carolina; Lucca,M. Florencia; Vázquez Rovere,Cecilia; Distéfano,Ana Julia; del Vas,Mariana; Hopp,Esteban.
The detection and exact quantification of the presence of GMOs (genetically modified organisms, also named as living modified organisms, LMOs) grains has become very important in international commercial transactions, especially from countries producing both types of commodities, GMOs and GMO-free. This makes necessary to check every batch previous delivery to the recipient country. Several PCR protocols have been proposed to detect the presence of GMO DNA in a sample due to its sensitivity and independence of environmental and physiological influences. However, most of them are qualitative assays and don’t give a good quantitative estimation of the detected signal. We developed a semi-quantitative method based on the comparison of the mass of the...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000200006

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

Plant regeneration via indirect somatic embryogenesis and optimisation of genetic transformation in Coffea arabica L. cvs. Caturra and Catuaí
Provedor de dados: 69
Autores: Gatica-Arias,Andrés M; Arrieta-Espinoza,Griselda; Espinoza Esquivel,Ana M.
A protocol for Coffea arabica L. cvs. Caturra and Catuaí plant regeneration via indirect somatic embryogenesis (ISE) was established. Furthermore, a biolistic mediated genetic transformation protocol was optimized for Catuaí callus aggregates. Maximum callus induction was obtained when Caturra (87%) and Catuaí (67%) leaves were cultured on Murashige and Skoog medium with 18.56 µM kinetin and 4.52 µM2,4-dichlorophenoxyacetic acid (2,4-D). Catuaí suspension cultures were established from embryogenic callus using liquid proliferation CP and Sli media and diffused light and darkness. The higher suspension cultures fresh weight was obtained using Erlenmeyer (1425.4 ± 354.9 mg) than Recipient for Automated Temporary Immersion System (RITA®) (518.6 ± 55.1 mg),...
Tipo: Journal article
Palavras-chave: Bioreactor; Coffee; Genetic transformation; Somatic embryogenesis; Suspension cultures.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100010

Extraction of bulk DNA from Thar Desert soils for optimization of PCR-DGGE based microbial community analysis
Provedor de dados: 69
Autores: Kumar Gothwal,Raj; Kumar Nigam,Vinod; Mohan,M. Krishna; Sasmal,Dinakar; Ghosh,Purnendu.
A reliable method for characterizing microbial communities on the basis of their differences in the 16S ribosomal RNA (rRNA) gene sequences in the hot arid zone sandy soils has been optimized. A desert plant (Calligonum polygonoides) was chosen to provide the rhizospheric soil samples, collected from three different agro-ecological locations. Total community DNA was efficiently extracted at small-scale level using direct lysis with hot sodium dodecyl sulphate (SDS), glass bead beating and finally subjecting the sandy soil to liquid nitrogen freeze-thaw cycles. To amplify V3 region of bacterial 16S rRNA gene, universal conserved primers were used. Second round polymerase chain reaction (PCR) was attempted to increase product concentration and to minimize...
Tipo: Journal article
Palavras-chave: Arid soils; Microbial community; PCR-DGGE; Rhizosphere; Soil DNA extraction.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300007

High-level soluble expression of the functional peptide derived from the C-terminal domain of the sea cucumber lysozyme and analysis of its antimicrobial activity
Provedor de dados: 69
Autores: Cong,Lina; Liang,Wenjing; Wu,Yao; Li,Cheng; Chang,Yihai; Dong,Liang; Song,Wanlin; Ma,Jun.
Background The sea cucumber lysozyme belongs to the family of invertebrate lysozymes and is thought to be a key defense factor in protecting aquaculture animals against bacterial infection. Recently, evidence was found that the sea cucumber lysozyme exerts broad spectrum antimicrobial action in vitro against Gram-negative and Gram-positive bacteria, and it also has more potent antimicrobial activity independent of its enzymatic activity. To explore the antimicrobial role of this non-enzymatic lysozyme and model its structure to novel antimicrobial peptides, the peptide from the C-terminal amino acid residues 70-146 of the sea cucumber lysozyme in Stichopus japonicus (SjLys-C) was heterologously expressed in Escherichia coli Rosetta(DE3)pLysS. Results The...
Tipo: Journal article
Palavras-chave: Affinity purification; Lysozyme peptide; Molecular modeling; Recombinant protein.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600005

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

Island Communities and Biotechnology
Provedor de dados: 69
Autores: DaSilva,Edgar J.; Taylor,Mary.
In the run-up to the year 2000 and beyond, several island countries, especially in the Caribbean and Pacific regions, are confronted by the challenges and threats of globalization. In response, several island countries are initiating self-reliant strategies aimed at national and regional endogenous development. Amongst these strategies, the potential of biotechnology for economic development and technological growth is being tapped.
Tipo: Journal article
Palavras-chave: Biotechnology; Pacific islands; Caribbean region; MIRCENS.
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000100001

Riverina high school students’ views of biotechnology
Provedor de dados: 69
Autores: Cavanagh,Heather; Hood,Jennie; Wilkinson,Jenny.
A survey investigating the knowledge and perception of biotechnology by high school students living in the rural Riverina region of New South Wales, Australia, was undertaken. Data relating to the student’ preferred and trusted information sources was also gathered. This study has demonstrated that at least two-thirds of students had a good knowledge of medical biotechnology issues, however, a significant proportion of the students did have concerns about the use and/or safety of biotechnology. Nearly 90% of the respondents would like further information on biotechnology. In agreement with other surveys, the students reported an apparent lack of trust in articles from the lay press (newspapers, television, radio) and yet still report that these media as...
Tipo: Journal article
Palavras-chave: Biotechnology; Education; Science; Secondary school.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200001

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

Induction of in vitro flowering in Capsicum frutescens under the influence of silver nitrate and cobalt chloride and pollen transformation
Provedor de dados: 69
Autores: Sharma,Ashwani; Kumar,Vinod; Giridhar,Parvatam; Ravishankar,Gokare Aswathanarayana.
The influence of silver nitrate (AgNO3) and cobalt chloride (CoCl2) on shoot multiplication and in vitro flowering in Capsicum frutescens Mill. was investigated. Exogenous administration of AgNO3 and CoCl2 at a concentration of 30 µM resulted in the maximum tissue response in terms of shoot length and number of shoots after 45 days culturing on MS medium. Both silver nitrate (40 µM) and cobalt chloride (30 µM) influenced in vitro flowering after 25 and 45 days respectively. This is the first report on in vitro flowering in C. frutescens. The study also demonstrated successful transformation of pollen obtained from the in vitro flowers. Since capsicum is highly recalcitrant to in vitro plant regeneration, the results of the study may be highly useful in...
Tipo: Journal article
Palavras-chave: Capsicum frutescens; Cobalt chloride; In vitro flowering; Pollen transformation; Regeneration; Silver nitrate.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200011

Hyper-production of a thermotolerant &amp;#946;-xylosidase by a deoxy-D-glucose and cycloheximide resistant mutant derivative of Kluyveromyces marxianus PPY 125
Provedor de dados: 69
Autores: Rajoka,Muhammad Ibrahim; Khan,Sana.
Production of &amp;#946;-xylosidaseby a cycloheximide and 2-deoxy-D-glucose-resistant mutant of Kluyveromyces marxianus PPY125 was studied when cultured on growth media containing galactose, glucose, xylose, cellobiose, sucrose and lactose as carbon sources. Xylose, cellobiose, lactose and sucrose were the key substrates. Both K. marxianus PPY125 and its mutant (M 125) supported maximum &amp;#946;-xylosidase specific product yield (Y P/X) following growth on xylose. Basal level of activity was observed in non-induced cultures grown on glucose. The mutant produced 1.5 to 2-fold more &amp;#946;-xylosidase than that produced by the wild cells. Synthesis of &amp;#946;-xylosidase was regulated by an induction mechanism in both wild and mutant cells. Addition of...
Tipo: Journal article
Palavras-chave: Enthalpy; Entropy; Enzyme kinetics; Fermentation; Induction; Thermodynamics.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200007

Genetic transformation studies and scale up of hairy root culture of Glycyrrhiza glabra in bioreactor
Provedor de dados: 69
Autores: Mehrotra,Shakti; Kumar Kukreja,Arun; Singh Khanuja,Suman Preet; Nath Mishra,Bhartendu.
The study was undertaken to induce hairy roots in Glycyrrhiza glabra in leaf explants and to optimize the nutritional requirement for its growth kinetics at shake flask and bioreactor level. Pathogenecity of Agrobacterium depends upon transformation ability of strain and age, type, and physiological state of explants. Agrobacterium rhizogenes strain K599 was used to infect leaf explants of G. glabra. Explants of different age groups were obtained from 2 to 5 weeks old in vitro grown cultures. Bacterial strain K599 could induce hairy roots in 3 and 4 weeks old leaf explants cultured on B5, MS, NB and WP basal semi-solid medium. Leaf explants of 2 and 5 weeks old culture were not responsive to bacterial infection in terms of hairy root induction. Maximum...
Tipo: Journal article
Palavras-chave: Agrobacterium; Bioreactor; Glycyrrhiza; Scale-up; Transformed roots.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200009

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

Operation of a slow rate anaerobic digester treating municipal secondary sludge
Provedor de dados: 69
Autores: Telles Benatti,Cláudia; Granhen Tavares,Célia Regina; Dias Filho,Benedito Prado; Ribeiro Moitinho,Maria da Luz.
This study was designed to evaluate the performance of a slow rate anaerobic digester in treating secondary sewage sludge received from one local municipal wastewater treatment plant. The digester was fed by secondary sewage sludge without any previous thickening. A series of three independent batch experiments was investigated at an operation time of 60 days. The total solids (TS) in the influent sludge contained a percentage of organic matter of 59, 63 and 54%, a concentration of volatile suspended solids (VSS) of 23.7, 29.2 and 27.8 g L-1 and a chemical oxygen demand (COD) of 51.8, 32.9 and 65.7 g L-1 for the three experiments, respectively. The operation of anaerobic digestion was stable, with no noticeable scum or foaming problems. The COD reduction...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300005

The ICY1 gene from Saccharomyces cerevisiae affects nitrogen consumption during alcoholic fermentation
Provedor de dados: 69
Autores: Martínez,Claudio; Contreras,Angela; Aguilera,Omayra; Ganga,Angelica; García,Veronica.
Background Saccharomyces cerevisiae is the main microorganism responsible for alcoholic fermentation. In this process, the consumption of nitrogen is of great importance since it is found in limiting quantities and its deficiency produces sluggish and/or stuck fermentations generating large economic losses in the wine-making industry. In a previous work we compared the transcriptional profiles between genetically related strains with differences in nitrogen consumption, detecting genes with differential expression that could be associated to the differences in the levels of nitrogen consumed. One of the genes identified was ICY1. With the aim of confirming this observation, in the present work we evaluated the consumption of ammonium during the...
Tipo: Journal article
Palavras-chave: Enological traits; Gene expression; Wine fermentation; Wine yeast.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000400002

Optimization of medium composition for transglutaminase production by a Brazilian soil Streptomyces sp.
Provedor de dados: 69
Autores: Macedo,Juliana Alves; Sette,Lara Durães; Sato,Hélia Harumi.
Finding a new microbial source of transglutaminase (MTGase) and the study of the medium composition for MTGase production were the goals of this work. A total of 200 actinomycete-like strains were isolated from Brazilian soil samples and two of them named T10b and P20 were selected based on their ability to produce 0.15 U.mL-1 and 0.25 U.mL-1 of MTGase, respectively. Strain P20 was chosen to continue the study and was identified as Streptomyces sp. In order to optimize the MTGase activity, modifications of the usual media composition described for enzyme production were tested. The strategy adopted was: (1) screening experiment for the best carbon and nitrogen sources; (2) fractional factorial design (FFD) to elucidate the key ingredients in the media (the...
Tipo: Journal article
Palavras-chave: Central composite design; Fractional factorial design; Medium optimization; Microbial transglutaminase; Streptomyces sp. P20.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400014

Sugar cane bagasse as feedstock for second generation ethanol production: Part II: Hemicellulose hydrolysate fermentability
Provedor de dados: 69
Autores: Betancur,Gabriel J. Vargas; Pereira Jr,Nei.
Sugar cane bagasse is produced in Brazil as waste of the sugar and ethanol industries. This lignocellulosic material is a potential source for second-generation ethanol production; however a pretreatment stage is essential, which aims at removing the hemicellulose component by disorganizing the lignocellulosic complex. In this work sugar cane bagasse was pretreated by diluted acid hydrolysis resulting in xylose-rich hydrolysates, which could be fermented to ethanol by a strain of the yeast Pichia stipitis. Statistical approach was used to investigate the effects of factors associated with the diluted acid hydrolysis process (acid concentration, solid:liquid ratio and time of exposure) on the fermentability of different hydrolysates. The statistical...
Tipo: Journal article
Palavras-chave: Bioethanol; Pichia stipitis; Xylose fermentation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500014

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

STABILITY OF BIOCATALYSTS
Provedor de dados: 69
Biocatalysts are inherently labile; therefore their operational stability is of paramount importance for any bioprocess. The problem of biocatalyst stability has been tackled from different perspectives, which are reviewed in the present paper. Inherently stable biocatalysts are well appreciated and a systematic effort is being done in the search of new organisms that harbor them. The potential of extremophiles has recently been recognized. Moreover, cloning such termophilic genes into more suitable mesophilic hosts is now at hand to produce stable biocatalysts. Another approach is to use site-directed mutagenesis to code for more stable proteins. A relevant number of actual industrial biocatalysts are being produced using such genetic and protein...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000100001

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

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

Trichoderma aureoviride 7-121, a mutant with enhanced production of lytic enzymes:: its potential use in waste cellulose degradation and/or biocontrol
Provedor de dados: 69
Autores: Zaldívar,Mercedes; Velásquez,Juan Carlos; Contreras,Inés; Pérez,Luz María.
A mutant of the native fungus Trichoderma aureoviride, 7-121, selected for its overproduction of extracellular cellulase and ß-glucosidase (cellobiase) was obtained. In shake flask cultures, production of endoglucanase, filter paper activity and cellobiase increased two to four- fold as compared with the wild type strain. The mutant strain is stable and grows rapidly in liquid as well as in solid culture media. Enzyme yields were best when pH was controlled so that it did not fall bellow pH 3.5. Cellobiase production by this mutant is particularly high (approximately 5 U/ml) as compared to other Trichoderma, strains, which makes it a suitable candidate for waste cellulose degradation. In addition, the mutant strain showed enhanced production of fungal cell...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300011

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

In vitro culture response of barley (Hordeum vulgare) ethylene synthesis mutant MC 169
Provedor de dados: 69
Autores: Biagioli,Carolina; Rios,Raúl; Basso,Alicia; Franzone,Pascual; Prina,Alberto.
Although it is generally accepted that plant in vitro culture response is influenced by the donor genotype, the genetic and molecular bases of this phenomenon are barely known. As a consequence, the optimization of tissue culture protocols is mainly empirically done. Researchers of the IGEAF studied the genetic basis of the in vitro regeneration of various plant species, including the tissue culture response of artificially induced barley mutants. One barley mutant, MC 169, carries a nuclear gene, recently described controlling the root growth in hydroponic cultivation. Under this condition, the roots of MC 169 mutant plants were longer than those of the original wild type line MC 182, a fact that was associated with a reduced ethylene biosynthesis. On the...
Tipo: Journal article
Palavras-chave: Callus induction; Ethylene; Habituated calli; Hydroponic culture; Regeneration.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300019

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

Infection of Caenorhabditis elegans by Salmonella typhi Ty2
Provedor de dados: 69
Autores: Santander,Javier; Espinoza,Juan Carlos; Campano,María Soledad; Robeson,James.
Several serovars of Salmonella infect and kill the nematode C. elegans. However, here we report that Salmonella typhi Ty2, a representative strain of this human pathogen, readily infects the intestinal lining of C. elegans without significantly affecting its viability. Our observation suggests extending the use of the C. elegans model system for the study of host parasite relationships, to address problems concerning the biology of S. typhi.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200008

Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries
Provedor de dados: 69
Autores: Mendoza,Lourdes; Carballa,Marta; Sitorus,Berlian; Pieters,Jan; Verstraete,Willy.
A major challenge in developing countries concerning domestic wastewaters is to decrease their treatment costs. In the present study, a new cost-effective reactor called gradual concentric chambers (GCC) was designed and evaluated at lab-scale. The effluent quality of the GCC reactor was compared with that of an upflow anaerobic sludge bed (UASB) reactor. Both reactors showed organic matter removal efficiencies of 90%; however, the elimination of nitrogen was higher in the GCC reactor. The amount of biogas recovered in the GCC and the UASB systems was 50% and 75% of the theoretical amount expected, respectively, and both reactors showed a slightly higher methane production when the feed was supplemented with an additive based on vitamins and minerals....
Tipo: Journal article
Palavras-chave: Developing countries; Mesophilic; Nutrients removal; Reactor design; Sewage.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200007

Effect of refrigerated storage on the probiotic survival and sensory properties of milk/carrot juice mix drink
Provedor de dados: 69
Autores: Daneshi,Mohammad; Ehsani,Mohammad Reza; Razavi,Seyed Hadi; Labbafi,Mohsen.
Background: There is a genuine interest in the development of probiotic milk and juice based beverages because they are a good-vehicle to deliver probiotic microorganisms to consumers. For this purpose, the viability and metabolism of four probiotic strains (Lactobacillus acidophilus LA5, Bifidobacterium lactis BB12, L. rhamnosus and L. plantarum) were studied in non-fermented milk and carrot juice mix drink. The drinks were evaluated in 5 days interval for viable cell count, pH, acidity, sedimentation and sensory quality during refrigerated storage at 4 ± 2ºC for up to 20 days. Results: The results showed that all strains had good viability in milk/carrot juice drink (88-98%), but L. acidophilus LA5 seemed more stable than three other strains. The levels...
Tipo: Journal article
Palavras-chave: Carrot juice; Functional beverage; Non-fermented; Probiotic; Viability.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500005

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

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

In Memoriam Rodolfo Ertola (1924-2011)
Provedor de dados: 69
Autores: Merchuck,José.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300002

High performance enzymatic synthesis of oleyl oleate using immobilised lipase from Candida antartica
Provedor de dados: 69
Autores: Mat Radzi,Salina; Basri,Mahiran; Bakar Salleh,Abu; Ariff,Arbakariya; Mohammad,Rosfarizan; Abdul Rahman,Mohd. Basyaruddin; Abdul Rahman,Raja Noor Zaliha Raja.
High performance enzymatic synthesis of oleyl oleate, a liquid wax ester was carried out by lipase-catalysed esterification of oleic acid and oleyl alcohol. Various reaction parameters were optimised to obtain high yield of oleyl oleate. The optimum condition to produce oleyl oleate was reaction time; 5 min, organic solvents of log P &amp;ge; 3.5, temperature; 40-50&amp;ordm;C, amount of enzyme; 0.2-0.4 g and molar ratio of oleyl alcohol to oleic acid; 2:1. The operational stability of enzyme was maintained at &gt;90% yield up to 9 cycles. Analysis of the yield of the product showed that at optimum conditions, &gt;95% liquid wax esters were produced
Tipo: Journal article
Palavras-chave: Oleyl oleate; Immobilised lipase; Esterification; Liquid wax ester.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300009

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

Evaluation of diversity among Argentine grapevine (Vitis vinifera L.) varieties using morphological data and AFLP markers
Provedor de dados: 69
Autores: Martínez,Liliana; Cavagnaro,Pablo; Masuelli,Ricardo; Rodríguez,José.
Half of the Argentine grapevine growing area is cultivated with local varieties generically called "Criollas". These materials differ in morphology, physiology and enological aptitudes from traditional European varieties. To discriminate among them, we used morphological markers to evaluate the genetic diversity and phenetic relatedness of 9 Criollas, 6 European and 1 American varieties and compared with AFLP markers. Three AFLP primer combinations generated a total of 111 scorable fragments. Dendrograms obtained with morphologic and AFLP markers agreed in clustering the "Criollas" separately from the European and American varieties assayed, except for Muscat d’ Alexandrie and Tempranillo which clustered with Criollas in the case of AFLP. Comparison of...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300009

Isolation and partial purification of a metabolite from a mutant strain of Bacillus sp. with antibiotic activity against plant pathogenic agents
Provedor de dados: 69
Autores: Bernal,Giuliano; Illanes,Andrés; Ciampi,Luigi.
The use of microorganisms for biological purposes has become an effective alternative to control plant pathogens. There are many examples of formulations using bacterial or fungal strains with biocontrol applications. Among them, members of the genus Bacillus are well known antibiotic producers. However, the increased capacity of antibiotic production obtained by direct mutagenesis of wild strains, has seldom been reported in the open literature. This research refers to the mutation of the A47 Bacillus strain, a plant pathogen antagonist, in order to obtain an improved strain with enhanced capacity to synthesize metabolites with antibiotic activity. The mutant strain M40 was obtained using the mutagenic agent acridine orange. The mutant strain showed a...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100008

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

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

Methylation-specific PCR analysis in Col8A1 promoter in Creole cattle carrier of rob(1;29)
Provedor de dados: 69
Autores: Postiglioni,Alicia; García,Cristina B; Rincón,Gonzalo; Arruga,M. Victoria.
Robertsonian translocation (rob(1;29)) is the most frequent structural chromosomal abnormality in cattle. Heterozygous carriers have a normal phenotype but show a 3-5% decrease in fertility. Chromatin decondensation was evaluated similar to the inactive X chromosome when submitted to demethylating agent. Based on this result, and the concept that imprinted genes are essential in embryonic development, we decided to query genes located on BTA1 and BTA29 that could undergo genome imprinting. The collagen typeVIII-Î±1 (Col8A1) acted on extracellular matrix structural proteins. DNA bisulfite conversion and sequentiation methods were used to compare its differential methylation patterns. It was performed on eight Creole cattle DNA blood samples from normal and...
Tipo: Journal article
Palavras-chave: Bisulfite; Collagen; Creole cattle; Cytosines; Methylation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300013

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

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

Natural carriers in bioremediation: A review
Provedor de dados: 69
Autores: Dzionek,Anna; Wojcieszy&amp;#324;ska,Danuta; Guzik,Urszula.
Bioremediation of contaminated groundwater or soil is currently the cheapest and the least harmful method of removing xenobiotics from the environment. Immobilization of microorganisms capable of degrading specific contaminants significantly promotes bioremediation processes, reduces their costs, and also allows for the multiple use of biocatalysts. Among the developed methods of immobilization, adsorption on the surface is the most common method in bioremediation, due to the simplicity of the procedure and its non-toxicity. The choice of carrier is an essential element for successful bioremediation. It is also important to consider the type of process ( n s tu or ex s tu), type of pollution, and properties of immobilized microorganisms. For these reasons,...
Tipo: Journal article
Palavras-chave: Adsorption; Bioethanol production; Contamination; Heavy metals; Immobilization; Immobilized microorganisms; Natural carriers; Wine alterations; Wood barrels; Xenobiotics.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500008

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

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

Letter received on Wednesday 14, August, 2002
Provedor de dados: 69
Autores: Wager,Robert; LaFayette,Peter; Parrott,Wayne.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200002

Genetic diversity associated with agronomic traits using microsatellite markers in Pakistani rice landraces
Provedor de dados: 69
Autores: Pervaiz,Zahida Hassan; Rabbani,M. Ashiq; Khaliq,Ishtiaq; Pearce,Stephen R; Malik,Salman A.
Genetic diversity underlies the improvement of crops by plant breeding. Land races of rice (Oryza sativa L.) can contain some valuable alleles not common in modern germplasm. The aim here was to measure genetic diversity and its effect on agronomic traits among rice land-race genotypes grown in Pakistan. Diversity was measured using thirty-five microsatellite markers and seventy-five genotypes. Among the markers used a total of 142 alleles were detected at 32 polymorphic SSR loci, while three loci were monomorphic in Pakistani rice landraces. The number of alleles identified by each marker ranged from 2 to 13 with a mean of 4.4. Size differences between the smallest and largest alleles varied from 11bp to 71bp. Polymorphism information content ranged from...
Tipo: Journal article
Palavras-chave: Genetic diversity; Landraces; Microsatellite markers; Oryza sativa L.; Pakistan; Rice.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300004

Purification and characterization of an aspartic protease from the Rhizopus oryzae protease extract, Peptidase R
Provedor de dados: 69
Autores: Hsiao,Nai-Wan; Chen,Yeh; Kuan,Yi-Chia; Lee,Yen-Chung; Lee,Shuo-Kang; Chan,Hsin-Hua; Kao,Chao-Hung.
Background Aspartic proteases are a subfamily of endopeptidases that are useful in a variety of applications, especially in the food processing industry. Here we describe a novel aspartic protease that was purified from Peptidase R, a commercial protease preparation derived from Rhizopus oryzae. Results An aspartic protease sourced from Peptidase R was purified to homogeneity by anion exchange chromatography followed by polishing with a hydrophobic interaction chromatography column, resulting in a 3.4-fold increase in specific activity (57.5 × 10³ U/mg) and 58.8% recovery. The estimated molecular weight of the purified enzyme was 39 kDa. The N-terminal sequence of the purified protein exhibited 63-75% identity to rhizopuspepsins from various Rhizopus...
Tipo: Journal article
Palavras-chave: Chromatography; Endopeptidase; Food processing industry; Homogeneity; Rhizopuspepsin.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000200006

Role of PPase-SE in Geotrichum klebahnii, a yeast-like fungus able to solubilize pectin
Provedor de dados: 69
Autores: Rojas,Natalia Lorena; Cavalitto,Sebastián Fernando; Mignone,Carlos Fernando; Hours,Roque Alberto.
Protopectinases (PPases) constitute a heterogeneous group of extracellular enzymes able to release soluble pectin from insoluble protopectin in plant tissues. Geotrichum klebahnii (ATCC 42397) produces PPase-SE with endopolygalacturonase activity. PPase-SE has been used for pectin extraction and maceration of plant tissues. Here, the capacity of G. klebahnii to use different pectins as carbon and energy sources (CES) was studied, in addition to PPase-SE capacity to release pectin from lemon peel. The strain was unable to use pectin from different origins as CES. When G. klebahnii was cultivated with mixtures of different amounts of glucose and citrus pectin as CES, the biomass obtained was proportional to the initial concentration of glucose, which was...
Tipo: Journal article
Palavras-chave: Carbon balance; Enzymatic pectin extraction; Microbial pectin utilization; Pectinases; Synthetic medium.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100012

Soft computing model on genetic diversity and pathotype differentiation of pathogens: A novel approach
Provedor de dados: 69
Autores: Gürüler,Hüseyin; Peker,Musa; Baysal,Ömür.
Background Identifying and validating biomarkers' scores of polymorphic bands are important for studies related to the molecular diversity of pathogens. Although these validations provide more relevant results, the experiments are very complex and time-consuming. Besides rapid identification of plant pathogens causing disease, assessing genetic diversity and pathotype formation using automated soft computing methods are advantageous in terms of following genetic variation of pathogens on plants. In the present study, artificial neural network (ANN) as a soft computing method was applied to classify plant pathogen types and fungicide susceptibilities using the presence/absence of certain sequence markers as predictive features. Results A plant pathogen,...
Tipo: Journal article
Palavras-chave: Computational biology; Genetic diversity; Molecular markers; Plant pathogens; Predictive information; Soft computing.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500004

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

Modulation of unsaturated fatty acids content in algae Spirulina platensis and Chlorella minutissima in response to herbicide SAN 9785
Provedor de dados: 69
Autores: Kachroo,Deepa; Singh Jolly,Shaneen M.; Ramamurthy,Viraraghavan.
The accumulation of polyunsaturated fatty acids by algae Spirulina platensis and Chlorella minutissima was studied. Response of these organisms to the substituted pyridazinone, SAN 9785, an inhibitor of the long chain fatty acid desaturase, indicated that fatty acid synthesis and their desaturation were regulated differently in these organisms. While the pool of palmitic acid, the precursor for the unsaturated C18 fatty acids, was stringently maintained in the green alga C. minutissima, in the cyanobacterium S. platensis the level of palmitic acid was liberally maintained in spite of the enhanced accumulation of unsaturated C18 fatty acids.
Tipo: Journal article
Palavras-chave: Chlorella minutissima; Fatty acid desaturation; Polyunsaturated fatty acids; Spirulina platensis; SAN 9785.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400006

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

Implementation of monitoring for genetically modified rapeseed in Serbia
Provedor de dados: 69
Autores: Nikolic,Zorica; Vujakovic,Milka; Jeromela,Ana Marjanovic; Jovicic,Dusica.
Genetically modified (GMO) rapeseed (Brassica napus) is not grown commercially in European Union, but several lines have been approved for production and use as food and feed. A case-specific monitoring of herbicide-tolerant rapeseed, events RT73, RF3 and T45 was established by Ministry of Agriculture of Republic of Serbia. The objectives of the present study were to introduce methods for detection of herbicide-tolerant GM oilseed rape, investigate occurrence and monitor the presence of GM rapeseed in seed and the feed products, as well as to develop a protocol for quantification. The study was based on 48 samples, rapeseed (33) and feed (15) products, imported from EU countries (Germany, Belgium, France, Czech Republic, Austria) and from domestic market....
Tipo: Journal article
Palavras-chave: Genetically modified organism; Monitoring; Rapeseed.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500017

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

Enhancement of &amp;#947;-aminobutyric acid in a fermented red seaweed beverage by starter culture Lactobacillus plantarum DW12
Provedor de dados: 69
Autores: Ratanaburee,Anussara; Kantachote,Duangporn; Charernjiratrakul,Wilawan; Penjamras,Pimpimol; Chaiyasut,Chaiyavat.
Lactobacillus plantarum DW12, a gamma-aminobutyric acid (GABA) producing strain, was used as a starter culture to produce a functional fermented red seaweed beverage (FSB). Optimal conditions for producing FSB were established using Central Composite Design by varying the amounts of monosodium glutamate (MSG), sucrose and the initial pH in MRS medium. After a verification test, 1% MSG, 6% sucrose and an initial pH of 6 were selected. Four treatments were tested: traditional formula (A), red seaweed-cane sugar-potable water = 3:1:10, w/w/v, initial pH 6; the traditional formula with a 5% starter culture consisting of 4.1 x 10(9) CFU of DW 12/ml (B); formula A modified by changing the amounts of cane sugar and MSG to 6% and 1%, respectively (C); formula C...
Tipo: Journal article
Palavras-chave: Functional fermented plant beverage; Î³-aminobutyric acid; Lactobacillus plantarum; Monosodium glutamate; Red seaweed; Response surface methodology.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300001

Effects of fermentation substrates and conservation methods on the viability and antimicrobial activity of Weissella confusa and its metabolites
Provedor de dados: 69
Autores: Serna-Cock,Liliana; Enríquez-Valencia,Cruz E; Jiménez-Obando,Eliana M; Campos-Gaona,Rómulo.
Lactic acid bacteria produce metabolites with antagonistic activity against other bacteria. However, growth conditions and conservation methods may reduce the viability and antimicrobial activity of lactic acid bacteria. This study evaluated the effects of fermentation substrate, lyophilization (freeze-drying) and refrigeration on the viability and antimicrobial activity of Weissella confusa strain and its metabolites against pathogens responsible for bovine mastitis. W. confusa strain was grown in MRS broth and milk supplemented with yeast extract and glucose (MYEG). The collected fractions were preserved by lyophilization or under refrigeration at 4ºC. Every seven days, the viability of W. confusa strain and the stability of its metabolites were...
Tipo: Journal article
Palavras-chave: Conservation; Inhibition; Lactic acid bacteria; Lyophilization.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300006

Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk
Provedor de dados: 69
Autores: Igwe,Jude C; Abia,Augustin A.
The mobilization of heavy metals in the environment due to industrial activities is of serious concern due to the toxicity of these metals in humans and other forms of life. The equilibrium adsorption isotherms of Cd(II), Pb(II) and Zn(II) ions, detoxification from waste water using unmodified and EDTA-modified maize husk have been studied. Maize husk was found to be an excellent adsorbent for the removal of these metal ions. The amount of these metal ions adsorbed increased as the initial concentration increased. Also, EDTA-modification enhanced the adsorption capacity of maize husk due to the chelating ability of ethylenediamine tetra acetic acid (EDTA). Among the three adsorption isotherms tested, Dubinin-Radushkevich isotherm gave the best fit with R²...
Tipo: Journal article
Palavras-chave: Adsorption isotherm; EDTA; Heavy metals; Maize husk; Waste water.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400007

Xylella fastidiosa: An in vivo system to study possible survival strategies within citrus xylem vessels based on global gene expression analysis
Provedor de dados: 69
Autores: Federici,María Teresa; Marcondes,Jackson A; Picchi,Simone Cristina; Stuchi,Eduardo S; Fadel,André Luiz; Laia,Marcelo L; Lemos,Manoel Victor F; Lemos,Eliana Gertrudes Macedo.
Xylella fastidiosa inhabits the plant xylem, a nutrient-poor environment, so that mechanisms to sense and respond to adverse environmental conditions are extremely important for bacterial survival in the plant host. Although the complete genome sequences of different Xylella strains have been determined, little is known about stress responses and gene regulation in these organisms. In this work, a DNA microarray was constructed containing 2,600 ORFs identified in the genome sequencing project of Xylella fastidiosa 9a5c strain, and used to check global gene expression differences in the bacteria when it is infecting a symptomatic and a tolerant citrus tree. Different patterns of expression were found in each variety, suggesting that bacteria are responding...
Tipo: Journal article
Palavras-chave: Citrus; Microarray; Xylella fastidiosa.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300004

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

Intramyocardial gene transfer of vascular endothelial growth factor 121 improves myocardial perfusion and function in the ischemic porcine heart
Provedor de dados: 69
Autores: Ojalvo,Ariana G; Seralena,Alina; Vispo,Nelson S; Silva,Ricardo; Gonzalez,Noel; Guevara,Luis; Batista,Juan F; Montequin,Jose F.; Chaos,Nicolas; González,Rafael; Reima,Camilo; Peña,Yamile; Coca,Marcos; Perera,Alejandro; Vazquez,Raysa; Puchades,Yaquelin; Garcia-Osuna,Tamara; Dominguez,Heberto; Reyes,Jose L.; Ali,Alfonso; Herrera,Luis.
Vascular endothelial growth factor (VEGF) is an endothelial cell-specific mitogen that is angiogenic in vitro and in vivo. Several studies report on gene transfer of VEGF121 to promote angiogenesis in the ischemic myocardium of animals and patients. We hypothesized that intramyocardial administration of naked plasmid DNA encoding VEGF121 could improve myocardial perfusion and function in a porcine model of myocardial ischemia. Yorkshire swine underwent thoracotomy and placement of an ameroid constrictor on the circumflex coronary artery. Four weeks later, pVEGF121 plasmid was administered into the ischemic myocardium. Four weeks after gene transfer, SPECT imaging demonstrated significant reduction in the ischemic area in pVEGF121-treated animals compared...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300008

Production of Rhodotorula glutinis: a yeast that secretes alpha-L-arabinofuranosidase
Provedor de dados: 69
Autores: Martínez,Claudio; Gertosio,Cecilia; Labbe,Angelica; Pérez,Rafael; Ganga,Maria Angélica.
Rhodotorula glutinis is a yeast that secretes the enzyme alpha-L-arabinofuranosidase (E.C. 3.2.1.55) into the culture medium and thus has an interesting biotechnological potential. To determine improved culture conditions of this organism, different factors of the culture media were evaluated such as the use of peptone as nitrogen source, salts composition, pH and growth temperature. Likewise, beet molasses and beet cosette were tested as industrial carbon sources to induce the production of the enzyme and how they influence the yeast growth. Based on these studies a culture medium is proposed for growth of this yeast in a continuous system. By assaying different dilution rates an average specific activity for the enzyme of 82.4 U/mg of protein was obtained.
Tipo: Journal article
Palavras-chave: Alpha-L-arabinofuranosidase yeast; Enzymes; Wine.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400009

Gene Discovery, Ownership and Access for Developing Countries in the Era of Molecular Genetics
Provedor de dados: 69
Autores: Mansur,Levi.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100006

Group III PLA2 from the scorpion, Mesobuthus tamulus: cloning and recombinant expression in E. coli
Provedor de dados: 69
Autores: Hariprasad,Gururao; Saravanan,Kolandaivelu; Singh,Sundararajan Baskar; Das,Utpal; Sharma,Sujata; Kaur,Punit; Singh,Tej Pal; Srinivasan,Alagiri.
Phospholipases A2 (PLA2) are enzymes that specifically hydrolyze the sn-2 fatty acid acyl bond of phospholipids, producing a free fatty acid and a lyso-phospholipid. We report the cloning and expression of a secretory phospholipase A2 (sPLA2) from Mesobuthus tamulus, Indian red scorpion. The nucleotide sequence codes for a 167 residue enzyme. The open reading frame codes for a 31 amino acid signal peptide followed by a mature portion of the protein. The primary structure shows the calcium binding motif, catalytic residues, 8 highly-conserved cysteines and C-terminal extension which classify it as a group III PLA2. The entire transcript was expressed in Escherichia coli and was purified by metal affinity chromatography under denaturing conditions. The...
Tipo: Journal article
Palavras-chave: Group III phospholipase A2; Mesobuthus tamulus; Recombinant expression.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300006

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

Phytoplasma and virus detection in commercial plantings of Vitis vinifera cv. Merlot exhibiting premature berry dehydration
Provedor de dados: 69
Autores: Matus,José Tomás; Vega,Andrea; Loyola,Rodrigo; Serrano,Carolina; Cabrera,Soledad; Arce-Johnson,Patricio.
A new and devastating physiological disorder of Vitis vinifera cv. Merlot was recently reported, known as premature berry dehydration (PBD), which is characterized by plant growth reduction, induction of general senescence and pedicel necrosis in the fruit, causing significant reductions in vineyard production. The causes of this disease remain unclear and previous reports suggest that it may be associated with phloem disruption and water provision. For this reason, any factor causing phloem disturbances could cause an important change in the berry water status. As some micro-organisms have been reported to disrupt phloem flow, we analyzed the occurrence of phytoplasma and viruses in commercial vineyards presenting PBD. In this study, a phytoplasma was...
Tipo: Journal article
Palavras-chave: Berry shrinkage; Candidatus phytoplasma mali; Late ripening; Over ripened; Pedicel necrosis; Phloem; Water transport.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500007

Effect of edible quinoa protein-chitosan based films on refrigerated strawberry (Fragaria × ananassa) quality
Provedor de dados: 69
Autores: Valenzuela,Carolina; Tapia,Cristian; López,Luis; Bunger,Andrea; Escalona,Victor; Abugoch,Lilian.
Background Strawberries are non-climacteric fruits with a low respiration rate, but are subject to serious fungal deterioration during postharvest handling. The edible coatings based on chitosan (CH), quinoa protein-chitosan (Q/CH) and quinoa protein-chitosan-sunflower oil (Q/CH/SO) may provide a solution to this problem. Thus, in this work CH, Q/CH and Q/CH/SO were elaborated and applied to fresh strawberries, and its effect on the strawberries shelf life during storage for 15 d was evaluated by mold and yeast count, fungal decay, carbon dioxide rate, physicochemical properties, and sensory evaluation. Results On all analysis days, the strawberries coated with the film-forming CH, Q/CH and Q/CH/SO solutions presented a significant lower amount of mold and...
Tipo: Journal article
Palavras-chave: Chitosan; Edible films; Quinoa protein; Strawberry; Sunflower oil.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600004

Present and future of bioleaching in developing countries
Provedor de dados: 69
Autores: Acevedo,Fernando.
Nowadays bioleaching occupies an increasingly important place among the available mining technologies. Today bioleaching is no longer a promising technology but an actual economical alternative for treating specific mineral ores. An important number of the current large-scale bioleaching operations are located in developing countries. This situation is determined by the fact that several developing countries have significant mineral reserves and by the characteristics of bioleaching that makes this technique especially suitable for these countries because of its simplicity and low capital cost requirement. The current situation of commercial-size bioleaching operations and ongoing projects in developing countries is presented and discussed with especial...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200001

Effects of aroma quality on the biotransformation of natural 2-phenylethanol produced using ascorbic acid
Provedor de dados: 69
Autores: Tian,Xun; Ye,Rui; Wang,Jingwen; Chen,Yifei; Cai,Baoguo; Guan,Shimin; Rong,Shaofeng; Li,Qianqian.
Background Natural 2-phenylethanol (2-PE) is an important flavoring that emits the aroma of roses. During biotransformation, the aroma quality of natural 2-PE is affected by its main by-products, which include butanol, isobutyric acid, butyric acid, and isovaleric acid. Thus, controlling undesirable by-product formation can reduce the effect of odor on 2-PE aroma quality. Results 2-PE was produced through biotransformation using l-phenylalanine as a substrate and glucose as a carbon source. Ascorbic acid was added to the system to improve the redox reaction and suppress the generation of by-products. Principal component analysis of the aroma quality of 2-PE was performed using an electronic nose. Similarity analysis revealed that the effects of four...
Tipo: Journal article
Palavras-chave: Aroma quality; Ascorbic acid; Biotransformation; By-products; 2-Phenylethanol.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400005

The influence of intelligence and emotions on the acceptability of genetically modified organisms
Provedor de dados: 69
Autores: Sorgo,Andrej; Jausovec,Norbert; Jausovec,Ksenija; Puhek,Miro.
The purpose of the study was to explore the relation between the acceptance of genetically modified organisms, basic emotions, general (IQ), verbal (VIQ) and procedural (PIQ) intelligence. The sample comprised 123 students of psychology (N = 65; 52.8%) and pre-service teachers (N = 58; 47.2%). There were 52 (42.3%) females and 71 males (57.7%) from one of the Slovenian universities. The conclusions of the study are as follows: a) acceptability of genetically modified organisms cannot be considered as a single group, but each GMO should be considered separately. Plants and microorganisms are much more easily to be accepted than animals and usages others than for food are more acceptable. Females showed higher level of acceptance than males. b) Among...
Tipo: Journal article
Palavras-chave: Acceptability; Emotions; Genetically modified organisms; Intelligence.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100001

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

Radioactive trace in semi natural grassland: Effect of 40K in soil and potential remediation
Provedor de dados: 69
Autores: Ciuffo,Liliana Eugenia del Carmen; Belli,María.
The uptake of radionuclides by plant roots constitutes the main pathway for the migration of radiocaesium from soil to humans, via food chain. In this study we assessed radiocaesium uptake by plant in order to piece together information on factors affecting uptake processes, particularly K supply and differential uptake among different plant species. Soil contaminated by the Chernobyl accident and forage from a semi-natural alpine grassland, situated in Tarvisio, Italy, were sampled during 1999. Under field conditions, 137Cs uptake for Graminaceae and Taraxacum officinale seem to behave in a comparable way. Higher 40K soil activity concentration leads to a lower 137Cs plant uptake, suggesting an inhibitory pattern of potassium on radiocaesium plants...
Tipo: Journal article
Palavras-chave: 137Cs plant uptake; Radioactive traces; Radiocaesium; Radiopotassium.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300024

Equipment design for biosorption studies with microorganisms
Provedor de dados: 69
Autores: Jensen,Thomas E; Crang,Mary C; Crang,Richard F.E.
Two laboratory devices have been designed for experimental use in biosorption studies involving the uptake and controlled release of elements from encapsulated living cells of microorganisms. The first device is an alginate bead maker capable of producing uniform (1.5 mm diameter) sodium alginate beads with encapsulated microorganisms. The second device is a flow-cell that can subject the encapsulated microorganisms to changing fluids, streaming gaseous microaerophyllic conditions, and which also allows for samples of fluid and beads to be extracted at any time during changing experimental conditions. Both devices are novel and simple in their design, and enable improved accuracy and precise handling of encapsulated specimens with minimal labour and...
Tipo: Journal article
Palavras-chave: Bead maker; Biosorption; Flow-cell; Sodium alginate.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400014

Medium optimization for palmarumycin C13 production in liquid culture of endophytic fungus Berkleasmium sp. Dzf12 using response surface methodology
Provedor de dados: 69
Autores: Zhao,Jianglin; Wang,Xiaohan; Sun,Weibo; Mou,Yan; Peng,Youliang; Zhou,Ligang.
Background: Berkleasmium sp. Dzf12, an endophytic fungus from Dioscorea zingiberensis, was a high producer of palmarumycin C13 with various bioactivities. In the present study, the experimental designs based on statistics were employed to evaluate and optimize the medium for palmarumycin C13 production in mycelia liquid culture of Berkleasmium sp. Dzf12. Results: Among various carbon and nitrogen sources, glucose, peptone and yeast extract were found to be the most favourable for palmarumycin C13 production based on the one-factor-at-a-time experiments. After Plackett-Burman test on the medium, glucose, peptone and yeast extract were further verified to be the most significant factors to stimulate palmarumycin C13 accumulation. These three factors (i.e.,...
Tipo: Journal article
Palavras-chave: Berkleasmium sp. Dzf12; Central composite design; Endophytic fungus; Mycelia liquid culture; Palmarumycin C13; Plackett-Burman test; Response surface methodology.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600016

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

RNA interference revolution
Provedor de dados: 69
Autores: Thakur,Archana.
RNA interference (RNAi) is a potent method using only a few double stranded RNA (dsRNA) molecule per cell to silence the expression which has made it one of the hottest topics in molecular biology in last two years. Not long ago scientists conducted gene knock out using antisense, dominant negative or knockout techniques which were ineffective, but the discovery of RNAi has enabled to knock out gene in any organism efficiently. RNA silencing was first discovered in transgenic plants, where it was termed co-suppression or post transcriptional gene silencing (PTGS). Five years ago the evidence for RNA silencing emerged from experimental observation on Caenorhabditis elegans, this new approach for achieving efficient, targeted gene silencing is now making its...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100007

Process design and sustainability in the production of bioethanol from lignocellulosic materials
Provedor de dados: 69
Autores: Scott,Felipe; Quintero,Julián; Morales,Marjorie; Conejeros,Raúl; Cardona,Carlos; Aroca,Germán.
Background: Bioethanol is produced mainly from sugar cane and corn. In the last years it has been subject of debate due to the effects in food prices and land use change. The use of lignocellulosic materials for bioethanol production, such as agroindustry, forestry and municipal residues, wood or dendroenergetic species, has been proposed as a sustainable way for producing this biofuel. The design of a sustainable process for producing bioethanol requires a methodological approach whereby economical, environmental and social criteria are systematically integrated from the early stages of process design. Results: Until now a methodology for guiding the design of a sustainable process for bioethanol production is not available, and there are just a few...
Tipo: Journal article
Palavras-chave: Bioethanol; Life cycle analysis; Lignocelluloses; Sustainability.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300013

Stenotrophomonas maltophilia isolated from gasoline-contaminated soil is capable of degrading methyl tert-butyl ether
Provedor de dados: 69
Autores: Alfonso-Gordillo,Guadalupe; Cristiani-Urbina,Eliseo; Flores-Ortiz,César Mateo; Peralta,Humberto; Cancino-Díaz,Juan Carlos; Cruz-Maya,Juan Antonio; Jan-Roblero,Janet.
Background: Methyl tert-butyl ether (MTBE) is a pollutant that causes deleterious effects on human and environmental health. Certain microbial cultures have shown the ability to degrade MTBE, suggesting that a novel bacterial species capable of degrading MTBE could be recovered. The goal of this study was to isolate, identify and characterize the members of a bacterial consortium capable of degrading MTBE. Results: The IPN-120526 bacterial consortium was obtained through batch enrichment using MTBE as the sole carbon and energy source. The cultivable fraction of the consortium was identified; of the isolates, only Stenotrophomonas maltophilia IPN-TD and Sphingopyxis sp. IPN-TE were capable of degrading MTBE. To the best of our knowledge, this report is the...
Tipo: Journal article
Palavras-chave: Bacterial consortium; Biodegradation; MTBE; Sphingopyxis sp; Stenotrophomonas maltophilia.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500003

Modulation of mitochondrial membrane integrity and ROS formation by high temperature in Saccharomyces cerevisiae
Provedor de dados: 69
Autores: Zhang,Min; Shi,Jun; Jiang,Li.
Background Yeast strains are exposed to numerous environmental stresses during industrial alcoholic fermentation. High temperature accumulated acetic acid, enhanced the growth inhibition and decreased ethanol production. Results In this study the influence of high temperature on the cellular and mitochondrial membrane integrity of Saccharomyces cerevisiae as well as reactive oxygen species (ROS) formation was investigated to understand the mechanisms of the high temperature fermentation process. However, increasing the temperature to 42°C resulted in a clear decrease in the cytoplasmic and mitochondrial membrane potential and an increase in intracellular ROS formation. It was also determined that the different thermostability between YZ1 and YF31 strains...
Tipo: Journal article
Palavras-chave: Bioethanol; Random amplified polymorphic DNA (RAPD); Yeast.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300010

Three new shuttle vectors for heterologous expression in Zymomonas mobilis
Provedor de dados: 69
Autores: Cao,Qinghua; Li,Tao; Shao,Huanhuan; Tan,Xuemei; Zhang,Yizheng.
Background: Zymomonas mobilis, as a novel platform for bio-ethanol production, has been attracted more attention and it is very important to construct vectors for the efficient expression of foreign genes in this bacterium. Results: Three shuttle vectors ( pSUZM 1, pSUZM2 and pSUZM3 ) were first constructed with the origins of replication from the chromosome and two native plasmids (pZZM401 and pZZM402) of Z. mobilis ZM4, respectively. The three shuttle vectors were stable in Z. mobilis ZM4 and have 3,32 and 27 copies, respectively. The promoter Ppdc (a), from the pyruvate decarboxylase gene, was clonedinto the shuttle vectors, generatingthe expressionvectors pSUZM1(2, 3)a. The codon-optimized glucoamylase gene from Aspergillus awamori combined with the...
Tipo: Journal article
Palavras-chave: Expression vector; Gene expression; Glucoamylase; Zymomonas mobilis.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100006

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

The future of biotechnology depends on quality science education
Provedor de dados: 69
Autores: Alberts,Bruce M.; Labov,Jay B.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300001

PCR-RFLP as a useful tool for diagnosis of invasive mycoses in a healthcare facility in the North of Brazil
Provedor de dados: 69
Autores: Sousa,Diego Rayan Teixeira de; Santos,Carla Silvana da Silva; Wanke,Bodo; Silva Júnior,Roberto Moreira da; Santos,Marcelo Cordeiro dos; Cruz,Kátia Santana; Monte,Rossicléia Lins; Nocker,Andreas; Souza,João Vicente Braga de.
Background The incidence of invasive mycoses is increasing worldwide. PCR-RFLP was applied to the identification of 10 reference strains and 90 cultures of agents of invasive mycoses. In addition, the new approach was applied to detect fungal agents in 120 biological samples (blood, cerebrospinal fluid and bone marrow). PCR-RFLP results were compared with the ones obtained with conventional methods (culture, microscopy, and biochemical testing). Results The assays carried out with the reference strains (Candida albicans, Candida parapsilosis, Candida tropicalis, Candida krusei, Candida guilliermondii, Cryptococcus neoformans, Cryptococcus gattii and Histoplasma capsulatum), demonstrated that the RFLP profiles were correctly predicted by the in silico...
Tipo: Journal article
Palavras-chave: Pathogenic fungus; Polymorphism; Simultaneous analysis.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300014

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

Optimization of transgenesis conditions for the generation of CXCL2-luciferase reporter mice line
Provedor de dados: 69
Autores: Crispo,Martina; Schlapp,Geraldine; Cárdenas-Rodríguez,Magdalena; González-Maciel,Dolores; Rumbo,Martín.
Background: Transgenesis by microinjection has been widely used for the generation of different mouse models. Different variables of the procedure may critically affect the efficiency of the process. A DNA construction that carries the CXCL2 promoter gene and firefly luciferase has been used to optimize aspects of the procedure. Three different concentrations (0.5, 1.0 and 4.0 ng/µl) of the DNA construction to microinject a total of 1981 zygotes has been tested. Intact/injected embryos, pregnancy and birth rate, survival of pups 7 days after birth, number of transgenic pups and overall transgenic efficiency was registered and analyzed by Z test of proportions for each group. Results: A total of seven transgenic founders were detected for the three DNA...
Tipo: Journal article
Palavras-chave: DNA concentration; Microinjection; Reporter systems.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600014

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

Enhancement of botrallin and TMC-264 production in liquid culture of endophytic fungus Hyalodendriella sp. Ponipodef12 after treatments with metal ions
Provedor de dados: 69
Autores: Luo,Haiyu; Xu,Dan; Xie,Rushan; Zhang,Xuping; Wang,Jian; Xuejiao,Dong; Lai,Daowan; Zhou,Ligang; Liu,Yang.
Background: Hyalodendriella sp. Ponipodef12, an endophytic fungus from a poplar hybrid, was a high producer of botrallin and TMC-264 with various bioactivities. In this study, the influences of eight metal ions (i.e.,Mn2+,Na+, Mg2+,Zn2+,Cu2+,Fe2+,Fe3+ and Al3+) on botrallin and TMC-264 production in liquid culture of the endophytic fungus Hyalodendriella sp. Ponipodef12 were investigated. Results: Three most effective metal ions (Zn2+,Cu2+ and Mg2+) along with their optimum concentrations were screened. The optimum addition time and concentrations of Zn2+,Cu2+ and Mg2+ were further obtained respectively for improving botrallin and TMC-264 production. The combination effects of Zn2+,Cu2+ and Mg2+ on the production of botrallin and TMC-264 by employing...
Tipo: Journal article
Palavras-chave: Combination effects; Production; Microbial biotechnology; Process biotechnology; Bioactivities; Central composite design; Response surface methodology.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600002

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

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

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

Enhancement of Escherichia coli cellulolytic activity by co-production of beta-glucosidase and endoglucanase enzymes
Provedor de dados: 69
Autores: Rodrigues,André L; Cavalett,Angélica; Lima,André O.S.
Cellulase is a group of enzymes (endoglucanase, exoglucanase and beta-glucosidase) required for cellulosic feedstock hydrolysis during bioethanol production. The use of recombinant cellulase is a strategy to reduce the enzyme cost. In this context, the present work describes the construction of a cellulase expression vector (pEglABglA), which allowed constitutive co-expression of endoglucanase A (EglA) from an endophytic Bacillus pumilus and the hyperthermophilic &amp;#946;-glucosidase A (BglA) from Fervidobacterium sp. in Escherichia coli. When compared to the non-modified strain DH5&amp;#945;, the recombinant Escherichia coli DH5&amp;#945; (pEglABglA) reduced fivefold the viscosity of the carboxymethylcellulose medium (CMC-M). Also, it presented almost...
Tipo: Journal article
Palavras-chave: Beta-glucosidase; Cellulase cassette; Cellulose bioconversion; Endoglucanase; Heterologous expression.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500005

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

Inbreeding evidence in a traditional channel catfish (Ictalurus punctatus) hatchery in Mexico
Provedor de dados: 69
Autores: Parra-Bracamonte,Gaspar Manuel; Sifuentes-Rincón,Ana María; Rosa-Reyna,Xochitl Fabiola De la; Arellano-Vera,Williams; Sosa-Reyes,Brenda.
Background: Channel catfish are one of the most important aquaculture species raised for food purposes in Mexico. Two temporal samples were obtained from the largest channel catfish breeding hatchery in Mexico to identify changes in genetic diversity and inbreeding that are promoted by traditional hatchery management. Results: The genetic parameter analysis of 11 microsatellite loci showed no significant change in genetic diversity (p &amp;gt; 0.05). However, a significant heterozygosis deficiency was detected (p &lt; 0.001), and genetic structure analysis indicated moderate differentiation between the temporally divided populations (F ST = 0.08). A moderate level of inbreeding and a slight increase of the inbreeding coefficient from 0.23 to 0.27 were the...
Tipo: Journal article
Palavras-chave: Channel catfish; Effective population size; Genetic diversity; Inbreeding.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600011

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

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

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

Ion pumps as targets for therapeutic intervention: Old and new paradigms
Provedor de dados: 69
Autores: Perlin,David S.
The development of an effective target for therapeutic intervention remains a critical part of the drug discovery process. One such target class is the P-type ion translocating ATPases, which include the Na+,K+-ATPase of cardiac cells and the H+,K+-ATPase of gastric parietal cells. These enzymes serve as selective targets for digoxin and omeprazole, which are used to treat heart disease and gastrointestinal ulcers, and are two of the leading prescribed therapeutics worldwide. It is the exquisite selectivity that can be achieved between family members that continues to make the P-type enzymes desirable targets for developing new therapeutics including a new generation of antiulcer therapeutic and a new class of antifungal therapeutic.
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000200002

Genome analysis of thirteen Colombian clostridial strains by pulsed field gel electrophoresis
Provedor de dados: 69
Autores: Quilaguy Ayure,Diana Milena; Suárez Moreno,Zulma Rocío; Aristizábal Gutierrez,Fabio Ancizar; Bernal Morales,Jose Mauricio; Montoya Castaño,Dolly.
Pulsed field gel electrophoresis was used for estimating the size of the genome and evaluating the presence of megaplasmids in 13 native Colombian solventogenic Clostridium strains. DNA preparation and purification were optimised for obtaining differentiated restriction fragments in electrophoresis. Genomic DNA was digested with ApaI, Eco52I, SmaI and XhoI enzymes. Estimated genome size for native strains ranged from 4.0 to 4.2 mega base pairs. Larger sized plasmids were detected and the presence of genes related to megaplasmid pSOL1 was determined by polymerase chain reaction. adc gene region amplification suggested that genes related to solventogenesis in native strains may be located in an extra-chromosomal element. Determining genome size provides...
Tipo: Journal article
Palavras-chave: Clostridium; Genome size; PFGE; PSOL1.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500009

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

Segregation distortion in homozygous lines obtained via anther culture and maize doubled haploid methods in comparison to single seed descent in wheat (Triticum aestivum L.)
Provedor de dados: 69
Autores: Adamski,Tadeusz; Krystkowiak,Karolina; Kuczynska,Anetta; Mikolajczak,Krzysztof; Ogrodowicz,Piotr; Ponitka,Aleksandra; Surma,Maria; Slusarkiewicz-Jarzina,Aurelia.
Background The quality of wheat grain depends on several characteristics, among which the composition of high molecular weight glutenin subunits, encoded by Glu-1 loci, are the most important. Application of biotechnological tools to accelerate the attainment of homozygous lines may influence the proportion of segregated genotypes. The objective was to determine, whether the selection pressure generated by the methods based on in vitro cultures, may cause a loss of genotypes with desirable Glu-1 alleles. Results Homozygous lines were derived from six winter wheat crosses by pollination with maize (DH-MP), anther culture (DH-AC) and single seed descent (SSD) technique. Androgenetically-derived plants that originated from the same callus were examined before...
Tipo: Journal article
Palavras-chave: Androgenesis; DH lines; HMW glutenin subunits; SSD technique; Winter wheat.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100002

Effects of culture filtrates of endophytic fungi obtained from Piper aduncum L. on the growth of Mycobacterium tuberculosis
Provedor de dados: 69
Autores: Lima,Alita Moura de; Salem,Júlia Ignez; Souza,João Vicente Braga de; Cortez,Ana Claudia Alves; Carvalho,Clarice Maia; Chaves,Francisco Célio Maia; Veiga Junior,Valdir Florêncio da.
Substances that inhibit the growth of Mycobacterium tuberculosis could potentially be used as antibiotics. These substances could also be added to test culture media to improve the speed of tuberculosis diagnosis. The aim of this work was to investigate the influence of culture filtrates of endophytic fungi isolated from P. aduncum L. on the growth of M. tuberculosis. To achieve this objective, the following methodology was used: a) endophytic fungi were isolated from the leaves and stems of P. aduncum L.; b) the isolated fungi were submitted to submerged bioprocessing; c) culture filtrates from the bioprocess were assayed to evaluate their effect on the growth of M. tuberculosis. We isolated 315 fungal types, which represented 85 morphologies, from...
Tipo: Journal article
Palavras-chave: Antagonism; Stimulation growth; Tuberculosis.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400008

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

Multiple pulses improve electroporation efficiency in Agrobacterium tumefaciens
Provedor de dados: 69
Autores: Mahmood,Tariq; Zar,Tamkina; Saqlan Naqvi,S.M.
Electroporation entails brief, high intensity pulse to create transient pores in the cell membrane to facilitate the entry of exogenous macromolecules, which may otherwise be excluded. Removal of the external field leads to the resealing of the membrane electropores permitting the survival of the electrically stimulated recipient cells. Using this technique foreign deoxyribonucleic acid (DNA) has been successfully introduced into many cell types both from prokaryotes and eukaryotes. Increase in pulse voltage and length beyond a critical limit has been reported to decrease transformation efficiency, hence in this study we have investigated another strategy i.e. increase in the number of pulses at constant high voltage and pulse duration. Commonly used...
Tipo: Journal article
Palavras-chave: Agrobacterium; Electroporation; Pulse number; Transformation efficiency.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100015

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

Macromolecular composition and anaerobic degradation of the sludge produced in a sequencing batch reactor
Provedor de dados: 69
Autores: Chelme,Susana; Fonseca,Pamela; Mercado,Rodrigo; Alarcon,Nelson; Sánchez,Omar.
The effect of sequencing batch reactor (SBR) operating conditions on sludge macromolecular composition and the effect of sludge macromolecular composition on the anaerobic degradation of the sludge produced in SBR was investigated in this work. A SBR, fed with synthetic wastewater, was operated at different air flow rates. The resulting sludge was analyzed in terms of protein, carbohydrate, phospholipid and polyhydroxybutyrate concentrations. Methane production during anaerobic digestion of the sludge was also measured. Ammonium, nitrite, nitrate, dissolved oxygen and chemical oxygen demand (COD) track studies in the SBR were carried out in order to relate SBR performance and sludge macromolecular composition. The lowest air flow rate at which the SBR was...
Tipo: Journal article
Palavras-chave: Anaerobic digestion; Sequencing batch reactor; Sludge.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300010

The bacterial community structure in an alkaline saline soil spiked with anthracene
Provedor de dados: 69
Autores: Castro-Silva,Carolina; Ruíz-Valdiviezo,Víctor M; Valenzuela-Encinas,César; Alcántara-Hernández,Rocio J; Navarro-Noya,Yendi E; Vázquez-Núñez,Edgar; Luna-Guido,Marco; Marsch,Rodolfo; Dendooven,Luc.
Background: The application of polycyclic aromatic hydrocarbons (PAHs) will affect the bacterial community structure as some groups will be favoured and others not. An alkaline saline soil with electrolytic conductivity (EC) 56 dS m-1 was spiked with anthracene and acetone while their effect on bacterial community structure was investigated. Results: The percentages of Acidobacteria and Actinobacteria decreased over time, while the percentage of Proteobacteria, mostly Xanthomonadales, increased. The percentage of the phylotypes belonging to the Nocardioides, Rhodococcus and Streptomyces, known degraders of PAHs, was larger in the anthracene-amended soil than in the acetone-amended and unamended soil at day 14. The phylotypes belonging to the genera...
Tipo: Journal article
Palavras-chave: C dynamics; N mineralization; Phylogenetic analysis; Polycyclic aromatic hydrocarbons; Principal component analysis; UniFrac.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500010

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

High genetic diversity and small genetic variation among populations of Magnolia wufengensis (Magnoliaceae), revealed by ISSR and SRAP marker
Provedor de dados: 69
Autores: Chen,Liyuan; Chen,Faju; He,Suichao; Ma,Luyi.
Background Genetic diversity and genetic variation of 10 populations and subpopulations of Magnolia wufengensis, a new and endangered endemic species, were examined by inter simple sequence repeat (ISSR) and sequence-related amplified polymorphism (SRAP) molecular markers. Compared with other endangered endemic Magnolia taxa, M. wufengensis holds a relatively high level of genetic variation. Result Total genetic diversity was found to be 87.7% for ISSR and 88.0% for SRAP markers. For polymorphic loci (P), the effective mean number of alleles (Ae) was 1.414 for ISSR markers and 1.458 for SRAP markers, while the mean expected heterozygosity (H) was 0.256 using ISSR and 0.291 for SRAP markers. Within-population variation was estimated for P as 74.9% using...
Tipo: Journal article
Palavras-chave: Genetic structure; ISSR; Population genetic diversity; SRAP.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600003

Heterozygosity following half-sib recurrent selection in popcorn using isoenzyme markers
Provedor de dados: 69
Autores: Pereira,Liz Kazmirczak; Scapim,Carlos Alberto; Mangolin,Claudete Aparecida; Machado,Maria de Fátima Pires da Silva; Pacheco,Cleso Antônio Patto; Mora,Freddy.
Isozyme biochemical marker may be useful tool for genomic analysis of maize populations undergoing recurrent selection. Thus, isozymes markers was utilized for assess the changes in the genetic variability and distance in a Brazilian composite population of popcorn following four cycles of recurrent selection for yield. One hundred and ninety-six half-sib families were evaluated from each cycle and the ten highest-yielding families (5.2%) were recombined to produce the next cycle. Isozyme analysis considered 80 seedlings per cycle. Simple linear regression equations were estimated among the allele frequencies in each locus in function of the selection cycles, the genetic distances among the cycles and the average heterozygosity per locus for each cycle....
Tipo: Journal article
Palavras-chave: Allozymes frequency; Genetic distance; Selection cycles; Zea mays.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100004

Genetic polymorphism of the &amp;#945;s1-casein locus in five populations of goats from Mexico
Provedor de dados: 69
Autores: Torres-Vázquez,José Antonio; Vázquez Flores,Felícitas; Montaldo,Hugo H; Ulloa-Arvizu,Raúl; Valencia Posadas,Mauricio; Gayosso Vázquez,Amanda; Alonso Morales,Rogelio Alejandro.
With the objective of estimating allele frequencies, and testing for population divergence for the CSN1S1 locus, genotypes of animals from five goat populations; Saanen (n = 97), Alpine (n = 81) Toggenburg (n = 92), local goats with external appearance similar to the Murciana-Granadina breed from Central Mexico (n = 26) and heterogeneous local animals denominated Mosaico Lagunero (n = 30), from Northern Mexico, were identified using PCR and Xmn1 PCR-RFLP methodology. For Saanen, Alpine and Toggenburg, the sum of E and F alleles had the largest frequencies (from 0.468 to 0.789), while for the groups local Murciana-Granadina and Mosaico Lagunero the sum of the most frequent allelic groups (A* and B*), were 0.385 and 0.533 respectively. Both local...
Tipo: Journal article
Palavras-chave: CSN1S1; Gene frequencies; Genetic diversity; Goat milk; PCR-RFLP.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300007

Identification of groundnut (Arachis hypogaea) SSR markers suitable for multiple resistance traits QTL mapping in African germplasm
Provedor de dados: 69
Autores: Ncube Kanyika,Busisiwe T; Lungu,Davies; Mweetwa,Alice M; Kaimoyo,Evans; Njung'e,Vincent M; Monyo,Emmanuel S; Siambi,Moses; He,Guohao; Prakash,Channapata S; Zhao,Yongli; de Villiers,Santie M.
Background This study aimed to identify and select informative Simple Sequence Repeat (SSR) markers that may be linked to resistance to important groundnut diseases such as Early Leaf Spot, Groundnut Rosette Disease, rust and aflatoxin contamination. To this end, 799 markers were screened across 16 farmer preferred and other cultivated African groundnut varieties that are routinely used in groundnut improvement, some with known resistance traits. Results The SSR markers amplified 817 loci and were graded on a scale of 1 to 4 according to successful amplification and ease of scoring of amplified alleles. Of these, 376 markers exhibited Polymorphic Information Content (PIC) values ranging from 0.06 to 0.86, with 1476 alleles detected at an average of 3.7...
Tipo: Journal article
Palavras-chave: Arachis; African varieties; Disease; SSR.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200001

Natural selection for efficiency in the use of nitrogen in common bean identified by analysis of microsatellites and grain yield
Provedor de dados: 69
Autores: Leite,Monik Evelin; Lima,Igor Almeida; Pereira,Dyanna Rangel; Santos,João Bosco dos.
This study was carried out in order to verify whether natural selection acts on segregating common bean populations grown in the presence and absence of N, and to verify that natural selection affects the frequency of microsatellite alleles specifically, and in order to identify those that can assist in selection. Four populations from the crosses Ouro Negro x CI-107 and VC-5 x IAPAR-81 were carried forward in bulk to F8 at both levels of N. Ouro Negro and VC-5 are considered stress tolerant to nitrogen and IAPAR-81 and CI-107 responsive. One hundred progenies were obtained from each cross and grown in the presence and absence of N. DNA was extracted from 400 progenies, of which 194 were evaluated in the rainy season and 79 in the winter crop for grain...
Tipo: Journal article
Palavras-chave: Adaptation; Nitrogen use efficiency; Phaseolus vulgaris; SSR markers.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600005

Induction of somatic embryogenesis as an example of stress-related plant reactions
Provedor de dados: 69
Autores: Zavattieri,Maria Amely; Frederico,António Miguel; Lima,Mónica; Sabino,Rui; Arnholdt-Schmitt,Birgit.
In this review, we address the role of stress as one of the principal causes for a cell or tissue to change its pre-existing somatic program, reprogramming itself to express the embryogenic pathway. The focus of this paper is the effect of different stress conditions on the induction phase of plant somatic embryogenesis, as well as the development of embryogenic competence as a result of the applied stresses. We also present a variety of data that link plant somatic embryogenesis, DNA methylation and oxidative stress response.
Tipo: Journal article
Palavras-chave: Cell reprogramming; Reactive oxygen species; Somatic embryogenesis; Stress.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100012

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

Kinetic characteristics of &amp;#946;-cyclodextrin production by cyclodextrin glycosyltransferase from newly isolated Bacillus sp. C26
Provedor de dados: 69
Autores: Cheirsilp,Benjamas; Kitcha,Suleeporn; Maneerat,Supasilp.
The kinetic characteristics of &amp;#946;-cyclodextrin production by a cyclodextrin glycosyltransferase (CGTase) produced by Bacillus sp. C26, a new isolate from a soil sample was investigated. Considering highest yield and initial production rate of &amp;#946;-cyclodextrin, among the starches examined, soluble starch, tapioca starch, sago starch, corn starch and rice starch, tapioca starch was the best substrate for this CGTase. The optimum temperature for tapioca starch gelatinization prior to its use as a substrate for &amp;#946;-cyclodextrin production was 65ºC. The yield and initial production rate of &amp;#946;-cyclodextrin increased with increasing starch concentration up to 6% and an enzyme concentration up to 48 U/g-starch. The kinetic parameters...
Tipo: Journal article
Palavras-chave: Bacillus subtilis ZK8; Cell adsorption; Jiean- peptide; Response surface methodology; Wood chips.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400004

Sequential use of ammonium and leucine as nitrogen sources during growth of Geotrichum candidum on a glucose based medium
Provedor de dados: 69
Autores: Adour,Lydia; Bude,Florence; Amrane,Abdeltif.
Geotrichum candidum growth on ammonium and leucine as nitrogen sources and glucose as a carbon source was examined. A clear preference of G. candidum for ammonium over leucine as a nitrogen source was shown. Indeed, ammonium was completely exhausted at the end of exponential growth after less than 35 hrs of culture; in contrast only 5% of leucine was concomitantly assimilated. Growth continued at slower rates on glucose and leucine as carbon and nitrogen sources respectively, and at the end of culture (185 hrs), leucine was completely exhausted.
Tipo: Journal article
Palavras-chave: Amino acids; Batch culture; Diauxic growth; Geotrichum candidum; Growth kinetics.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100013

Optimization of worm-bed leachate for culturing of tomato (Lycopersicon esculentum Mill) inoculated with Glomus fasciculatum and Pseudomonas fluorescens
Provedor de dados: 69
Autores: Oliva-Llaven,María Ángela; Rodríguez-Hernández,Ludwi; Mendoza-Nazar,Paula; Ruiz-Sesma,Benigno; Álvarez-Solís,José David; Dendooven,Luc; Gutiérrez-Miceli,Federico A.
A response surface technique was used to analyze the effect of Glomus fasciculatum, Pseudomonas fluorescens and worm-bed leachate (WBL) on growth, yield and characteristics of tomato (Lycopersicon esculentum Mill). The treatments combined inoculation with or without P. fluorescensor G. fasciculatum and the application of WBL at 20% (v/v) each day or every three days. Plant height, number of leaves and yield of tomato fruits was not affected by the factors studied. However, plants with foliar application of WBL each day developed wider stems than those with an application every three days. The pH of the fruits was lower when WBL was applied every three days compared to a daily application. The soluble solids content of the fruits was higher when WBL was...
Tipo: Journal article
Palavras-chave: Glomus fasciculatum; Organic cultivation of tomato; PH in tomato fruit; Soluble solids.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000200004

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

Plant biotechnology: a tool for development in Africa
Provedor de dados: 69
Autores: Brink,Johan A; Woodward,Barbara R; DaSilva,Edgar J.
Africa is, paradoxically, a continent rich in resources, and yet, lacking and lagging in overall development. When the wealth of Africa’s people is compared with that of other continents a contrasting picture of poverty, stunted growth and famine resulting from inadequate food production is revealed. Applying plant biotechnology alone cannot solve the agricultural and food security problems in Africa. Five key factors seem to be necessary for the improvement of crop production: they are the use of agrochemicals, irrigation, plant breeding, farm management, and, of course, plant biotechnology. In this context, biotechnology can play a role in commercializing crops, creating new jobs and earning foreign exchange. The goals of national and regional...
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000300004

International experience in human resource development in biotechnology: achievements and lessons learnt
Provedor de dados: 69
Autores: Tatsuji,Seki; Toshiomi,Yoshida; Takuya,Nihira; DaSilva,Edgar.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200003

Fermentation of rice bran hydrolysate to ethanol using Zymomonas mobilis biofilm immobilization on DEAE-cellulose
Provedor de dados: 69
Autores: Todhanakasem,Tatsaporn; Narkmit,Tipong; Areerat,Kamonchanok; Thanonkeo,Pornthap.
Background The major challenges associated with the fermentation of lignocellulosic hydrolysates are the reduction in the operating cost and minimizing the complexity of the process. Zymomonas mobilis biofilm has been emerged to resolve these complexities. Biofilm has been reported to tolerate to the toxic inhibitors and easily manipulated toward the cell recycle through the cell immobilization. Results Z. mobilis ZM4 and TISTR 551 were able to develop biofilms on DEAE cellulose under the differences in the morphologies. Z. mobilis ZM4 developed homogeneous biofilm that brought DEAE fiber to be crosslinking, while Z. mobilis TISTR 551 developed heterogeneous biofilm in which crosslinking was not observed. Ethanol production under batch and repeated batch...
Tipo: Journal article
Palavras-chave: Biofilm; Ethanol production; Rice bran; Zymomonas mobilis.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300009

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

Photo-fermentational hydrogen production of Rhodobacter sp. KKU-PS1 isolated from an UASB reactor
Provedor de dados: 69
Autores: Assawamongkholsiri,Thitirut; Reungsang,Alissara.
Background In this study, the detection of nifH and nifD by a polymerase chain reaction assay was used to screen the potential photosynthetic bacteria capable of producing hydrogen from five different environmental sources. Efficiency of photo-hydrogen production is highly dependent on the culture conditions. Initial pH, temperature and illumination intensity were optimized for maximal hydrogen production using response surface methodology with central composite design. Results Rhodobacter sp. KKU-PS1 (GenBank Accession No. KC478552) was isolated from the methane fermentation broth of an UASB reactor. Malic acid was the favored carbon source while Na-glutamate was the best nitrogen source. The optimum conditions for simultaneously maximizing the cumulative...
Tipo: Journal article
Palavras-chave: NifD; NifH; Photo fermentation; Purple-non-sulfur bacteria.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300013

Plant genomic instability detected by microsatellite-primers
Provedor de dados: 69
Autores: Leroy,Xavier J.; Leon,Karine; Branchard,Michel.
This report describes a new application of the Inter-Simple Sequence Repeat (ISSR) technique. This technology based on the amplification of regions between microsatellites was applied to different calli from the same cauliflower mother plant. One of the tested ISSR primers, (GATA)4, generated great polymorphism. Twelve different markers were detected on polyacrylamide gels. After sequencing, one sequence showed homology with a predicated A. thaliana gene closely related to genes involved in the regulation of cell proliferation in mammalians. This marker is characterised by three microsatellites and a palindromic sequence. Possible causes of mutations in this marker are discussed and will be investigated. ISSR amplification appears as a reliable method in...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000200005

Indole acetic acid and ACC deaminase from endophytic bacteria improves the growth of Solarium lycopersicum
Provedor de dados: 69
Autores: Latif Khan,Abdul; Ahmed Halo,Boshra; Elyassi,Ali; Ali,Sajid; Al-Hosni,Khadija; Hussain,Javid; Al-Harrasi,Ahmed; Lee,In-Jung.
Background: Endophytic bacteria are ubiquitous in all plant species contributing in host plant's nutrient uptake and helping the host to improve its growth. Moringa peregrina which is a medicinal plant, growing in arid region of Arabia, was assessed for the presence of endophytic bacterial strains. Results: PCR amplification and sequencing of 16S rRNA of bacterial endophytes revealed the 5 endophytic bacteria, in which 2 strains were from Sphingomonas sp.; 2 strains from Bacillus sp. and 1 from Methylobacterium genus. Among the endophytic bacterial strains, a strain of Bacillus subtilis LK14 has shown significant prospects in phosphate solubilization (clearing zone of 56.71 mm after 5 d), ACC deaminase (448.3 ± 2.91 nM &amp;#945;-ketobutyrate mg-1 h-1) and...
Tipo: Journal article
Palavras-chave: ACC deaminase; Bacillus subtilis LK14; Endophytism; Indole 3-acetic acid; Tomato plant growth.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300007

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 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

Immunological strategy for detecting the pro-inflammatory cytokine TNF-alpha in salmonids
Provedor de dados: 69
Autores: Rojas,Verónica; Morales-Lange,Byron; Guzmán,Fanny; Gallardo,José A; Mercado,Luis.
Background: Tumour necrosis factor-alpha (TNF-&amp;#945;) is a pro-inflammatory cytokine which exerts a variety of immunological functions in vertebrates. TNF-&amp;#945; has been identified and cloned in a number of teleost fish species; nevertheless, the functions displayed by this cytokine in fishes remain poorly understood, given that the low sequence identity compared to their mammalian counterpart, limit fish TNF-&amp;#945; detection using mammalian antibodies. Then, for fish immune response characterization is fundamental the production of specific fish anti-TNF-&amp;#945; antibody. Results: We have developed a monoespecific antibody against the pro-inflammatory molecule TNF-&amp;#945; of salmonid fish. TNF-&amp;#945; epitope region was identified...
Tipo: Journal article
Palavras-chave: Fish immunity; Salmonid immunity; TNF-alpha antibody.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500021

Effects of agitation and exogenous H2 on bioconversion of sugarcane bagasse into ethanol by Clostridium thermocellum ATCC 27405
Provedor de dados: 69
Autores: Groposo,Claudia; Castro,Aline Machado de; Pereira Jr,Nei.
Background: The production of ethanol by a Consolidated Bioprocessing (CBP) strategy, which simultaneously combines cellulase production, lignocellulosic biomass hydrolysis and fermentation of released sugars to ethanol in one bioreactor, is a promising technology for cost reduction in the biological processing of biomass, specially using agroindustrial residues. Clostridium thermocellum is an anaerobic, thermophilic, strictly fermentative gram positive bacterium that meets all the requirements for CBP. Results: Ethanol concentration obtained in the non-stirred fermentation process in flasks with raw bagasse was two times greater than that in the stirred system. The results observed using a pretreated sugarcane bagasse in non-stirred flasks regarding...
Tipo: Journal article
Palavras-chave: Consolidated bioprocessing; Pretreated sugarcane bagasse; Raw sugarcane bagasse; Thermophilic.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600009

Population structure and genetic diversity of Brazilian popcorn germplasm inferred by microsatellite markers
Provedor de dados: 69
Autores: da Silva,Tereza Aparecida; Belizário Cantagalli,Liriana; Saavedra,Javier; Lopes,Ana Daniela; Aparecida Mangolin,Claudete; Pires da Silva Machado,Maria de Fatima; Scapim,Carlos Alberto.
Background The genetic diversity and structure of 31 popcorn accessions of the germplasm bank of the State University of Maringá were assessed using 30 microsatellite primers. Results 127 alleles were identified from 30 evaluated loci. The number of alleles per locus ranged from two to eight. The overall mean of the polymorphic loci averaged 79.89%. The primers UMC1549 and UMC1072 detected polymorphism in all accessions analyzed. The mean observed heterozygosity ranged from 0.07 to 0.30 and the highest proportion of heterozygous plants was observed in accession BOZM 260 (Ho = 0.30). The analysis of molecular variance revealed that 60% of the total genetic variation was found within accessions and 40% was found between accessions. The Bayesian clustering...
Tipo: Journal article
Palavras-chave: Genetic variability; Maize; Molecular marker.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300007

Phytoconstituents and antioxidant properties among commercial tea (Camellia sinensis L.) clones of Iran
Provedor de dados: 69
Autores: Azadi Gonbad,Reza; Afzan,Adlin; Karimi,Ehsan; Sinniah,Uma Rani; Kumara Swamy,Mallappa.
Background Tea (Camellia sinensis), a well-known beverage is consumed frequently worldwide due to its high antioxidant properties. The present study determines the amount of phytochemicals and antioxidant activities among 12 high yielding tea clones cultivated in Iran. Results Among the 12 clones studied, tea clone Iran 100 had the highest total phenolic content and total flavonoid content with values of 8.44 ± 1.03 mg gallic acid equivalents per gram dry weight and 4.50 ± 0.16 mg rutin equivalents per gram dry weight respectively. High performance Liquid Chromatography (HPLC) analysis of phenolics and flavonoids in 12 clones revealed the presence of (+)-catechin, (-)-epicatechin, (-)-epigallocatechin, (-)-epigallocatechin-gallate, (-)-epicatechingallate,...
Tipo: Journal article
Palavras-chave: Camellia sinensis; DPPH assay; Methanolic extract; Total flavonoid content; Total phenolic content.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600008

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

Purification of a functional competitive antagonist for calcitonin gene related peptide action from sardine hydrolysates
Provedor de dados: 69
Autores: Rousseau,Marthe; Batista,Irineu; Le Gal,Yves; Fouchereau-Peron,Martine.
Calcitonin gene related peptide (CGRP) related molecules were purified from sardine hydrolysates prepared using 0.1% alcalase and two hours of hydrolysis. Gel exclusion chromatography and HPLC performed purification of these molecules. The purified molecules were characterised using specific CGRP radioimmunoassays and radioreceptoraasays. From 22 mg of crude extract, we obtained 14 µg of CGRP related molecules, the molecular weight determined by mass spectrophotometry was 6000 daltons. The biological activity of these molecules was analysed using the ability of CGRP to stimulate the adenylate cyclase activity in rat liver membranes. The purified molecules induced an inhibition of the CGRP stimulated adenylate cyclase activity, this effect was specific as...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000100003

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

Isolation, purification, and characterization of L-glutamate oxidase from Streptomyces sp. 18G
Provedor de dados: 69
Autores: Wachiratianchai,Supawadee; Bhumiratana,Amaret; Udomsopagit,Suchat.
An extracellular L-glutamate oxidase (GLOD) was purified from soil-isolated Streptomyces sp 18G. The enzyme had a molecular weight of approximately 120,000 and consisted of two identical subunits, each with a molecular weight of 61,000. The isoelectric point was pH 8.5 and the enzyme had an optimal pH between 7.0-7.4. GLOD showed the maximum activity at 37ºC. The GLOD activity was stable at pH ranging from 6.5 to 7.0 for 1 hr. Among 21 amino acids tested for substrate specificity, L-glutamate was almost exclusively oxidized. D-glutamate and L-aspartate were oxidized but only to extents of 0.79% and 0.53%, respectively.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300009

Rigor: The essence of scientific work
Provedor de dados: 69
Autores: Allende,Jorge E.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100001

Physicochemical and nutritional alterations induced by two-spotted spider mite infestation on strawberry plants
Provedor de dados: 69
Autores: Livinali,Emanuele; Sperotto,Raul Antonio; Ferla,Noeli Juarez; Souza,Claucia Fernanda Volken de.
Background Strawberry is a pseudofruit mainly cultivated in temperate climate regions. Considering its high levels of ascorbic acid and phenolic compounds, the consumption of strawberry fruit can be beneficial to health. The Brazilian strawberry production revolves around 3000 tons per year, significantly influencing the food market and generating income to farmers. However, this production can be partially impaired by two-spotted spider mite (TSSM) Tetranychus urticae Koch infestations, due to decreases in the quality and quantity of fruit. Since there are no data in the literature about alterations caused by TSSM infestation in strawberry plants, our work aimed towards evaluating nutritional and physicochemical parameters of TSSM-infested strawberry...
Tipo: Journal article
Palavras-chave: Biological control; Phytoseiulus macropilis; Tetranychus urticae.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500001

Preparation and characterization of &amp;#954;-carrageenase immobilized onto magnetic iron oxide nanoparticles
Provedor de dados: 69
Autores: Xiao,Anfeng; Xu,Caiyun; Lin,Yan; Ni,Hui; Zhu,Yanbing; Cai,Huinong.
Background Carboxyl-functionalized magnetic nanoparticles were synthesized via chemical co-precipitation method and modified with oleic acid which was oxidized by potassium permanganate, and &amp;#954;-carrageenase from Pseudoalteromonas sp. ASY5 was subsequently immobilized onto them. The immobilization conditions were further optimized, and the characterizations of the immobilized &amp;#954;-carrageenase were investigated. Results The &amp;#954;-carrageenase was immobilized onto magnetic iron oxide nanoparticles, and the bonding was verified by Fourier transform infrared spectroscopy. The optimal conditions for &amp;#954;-carrageenase immobilization were 2.5% (w/v) glutaraldehyde, 13.9 U &amp;#954;-carrageenase for 20 mg of magnetic nanoparticles, a 2-h...
Tipo: Journal article
Palavras-chave: Carrageenase; Characterization; Immobilization; Nanoparticles.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100001

Production of enzymes from Lichtheimia ramosa using Brazilian savannah fruit wastes as substrate on solid state bioprocessess
Provedor de dados: 69
Autores: Silva,Cinthia Aparecida de Andrade; Lacerda,Maria Priscila Franco; Leite,Rodrigo Simões Ribeiro; Fonseca,Gustavo Graciano.
Background: Enzyme production by solid state bioprocess (SSB) using residues as substrate for microorganisms is an alternative for costs reduction and to avoid their disposal into environment. The aim of this work was to evaluate the physiology of the fungus Lichtheimia ramosa in terms of microbial growth and production of amylases, &amp;#946;-glucosidases, carboxymethylcellulase (CMCase), and xylanases, via SSB, utilizing wastes of the Brazilian savannah fruits bocaiuva (Acrocomia aculeata), guavira (Campomanesia pubescens) and pequi (Caryocar brasiliense) as substrate at different temperatures (25, 30, and 35ºC) during 168 hrs. Results: Samples were taken every 24 hrs, which resulted in 8-points kinetic experiments to determine microbiological and...
Tipo: Journal article
Palavras-chave: Amylase &amp;#946; -glucosidase CMCase Lichtheimia ramosa xylanase.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500009

Optimization of fermentation conditions for pristinamycin production by immobilized Streptomyces pristinaespiralis using response surface methodology
Provedor de dados: 69
Autores: Zhang,Li-Jing; Zheng,Â· Xi; Jin,Â· Zhi-Hua; Hu,Â· Sheng; He,Â· Mei-Ru.
Response surface methodology was used to optimize the fermentation conditions for the production of pristinamycin by immobilization of Streptomyces pristinaespiralis F213 in shaking &amp;#64258;ask cultivation. Seed medium volume, fermentation medium volume and shaking speed of seed culture were found to have signi&amp;#64257;cant effects on pristinamycin production by the Plackett-Burman design. The steepest ascent method was adopted to approach the vicinity of optimum space, followed by central composite design for further optimization. A quadratic model was built to &amp;#64257;t the pristinamycin production. The optimum conditions were found to be seed medium volume of 29.5 ml, fermentation medium volume of 28.8 ml, and shaking speed of seed culture at...
Tipo: Journal article
Palavras-chave: Fermentation conditions; Immobilization; Pristinamycin; Response surface methodology; Streptomyces pristinaespiralis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400006

Molecular cloning and antibacterial activity of hepcidin from Chinese rare minnow (Gobiocypris rarus)
Provedor de dados: 69
Autores: Ke,Fei; Wang,Yun; Yang,Chuan-Shun; Xu,Chen.
Background Hepcidins, a kind of cysteine-rich antimicrobial peptides, play important roles in host immunological processes and iron regulation, which have been identified from several fish species. The rare minnow (Gobiocypris rarus), an endemic cyprinid fish in China, has been used extensively as model animal in laboratory. However, little is known about its hepcidin. Here, we report the cloning and characterization of a hepcidin gene from the liver of Chinese rare minnow. Results The full-length cDNA of rare minnow hepcidin is 662 bp, which contains an ORF of 273 bp encoding a prepropeptide of 90 amino acid residues. The predicted prepropeptide contains three domains: a signal peptide of 24 amino acids, a prodomain of 41 amino acids, and a mature peptide...
Tipo: Journal article
Palavras-chave: Cysteine residues; Phylogenetic analysis; Rare minnow hepcidin; Synthetic peptide.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300005

Effect of sulphate concentration and sulphide desorption on the combined removal of organic matter and sulphate from wastewaters using expanded granular sludge bed (EGSB) reactors
Provedor de dados: 69
Autores: Valdés,Freddy; Muñoz,Edmundo; Chamy,Rolando; Ruiz,Gonzalo; Vergara,Christian; Jeison,David.
During the application of anaerobic processes to high sulphate concentration wastewaters, operational problems are expected due to the occurrence of sulphate reduction. Sulphide production reduces effluent quality and may produce inhibition. The application of Expanded Granular Sludge Bed (EGSB) reactors for the combined removal of organic matter and sulphate was studied at different COD/sulphate and 3 values of pH. During the EGSB reactor operation, most of the sulphide remains in the liquid phase reducing effluent quality. The inclusion of a desorption column in the recirculation of the EGSB reactor promotes mass transfer to the gas phase, reducing the sulphide concentration in the liquid phase, significantly decreasing the chemical oxygen demand of the...
Tipo: Journal article
Palavras-chave: Anaerobic digestion; EGSB; Sulphate reduction; Sulphide.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400004

VNTR-based diversity analysis of 2x and 4x full-sib Musa hybrids
Provedor de dados: 69
The triploid plantain landrace Obino l’Ewai (Musa spp., AAB genome) has been crossed with a wild diploid banana (M. acuminata subsp. burmannica var. ‘Calcutta 4’, AA genome) to generate full-sib diploid and tetraploid hybrids combining good agronomic performance and disease resistance. Microsatellite marker analysis of the parental genotypes confirmed the highly heterozygous nature of both parental genotypes. Comparative analysis of 2x and 4x full-sib hybrids with their parental genotypes indicated that tetraploid hybrids are generally more closely related to Obino l’Ewai than their diploid full-sibs. Based on VNTR analysis it is possible to identify those hybrids, which may be most useful in subsequent breeding of secondary triploid hybrids. There was a...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000300002

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

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

Genetic and physical map of broad host range cosmid pRG930cm
Provedor de dados: 69
Autores: Chibeu,Andrew; Lavigne,Rob; Mattheus,Wesley; Matthijs,Sandra; Cornelis,Pierre; Volckaert,Guido.
We hereby present the complete sequence and annotation of pRG930cm, a spectinomycin/streptomycin/chloramphenicol-resistant cosmid vector. pRG930cm (17,256 bp; GenBank Accession No.: FM174471) has a broad host range, and is stably maintained by a number of Gram-negative bacteria including Pseudomonas spp, Escherichia coli, Agrobacterium tumefaciens and Azorhizobium caulinodans ORS571. pRG930cm is already widely used and its sequence will aid efficient construction and analysis of cosmid libraries.
Tipo: Journal article
Palavras-chave: Cosmid; PRG930cm; Pseudomonas; Sequencing.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200010

Selection of sulfur oxidizing bacterium for sulfide removal in sulfate rich wastewater to enhance biogas production
Provedor de dados: 69
Autores: Kantachote,Duangporn; Charernjiratrakul,Wilawan; Noparatnaraporn,Napavarn; Oda,Kohei.
Sulfur oxidizing bacteria (SOB) were isolated and tested in order to remove sulfide from high sulfate wastewater to reduce the amount of hydrogen sulfide (H2S) in the produced biogas. A promising SOB isolate, designated as isolate T307, was selected due to its best sulfide removal (86.7%) in the effluent of a sulfate reduction reactor (SRR) over a 24 hrs incubation. The bacterium was able to grow better as a mixotroph (yeast extract as a carbon source) than as a chemolithoautotroph. In addition, as a heterotroph, the bacterium grew well with yeast extract and peptone. Based on partial 16S rRNA gene sequence, the isolated T307 was an Alcaligenes sp. and was able to convert most of sulfide species (total sulfide: TS; dissolved sulfide: DS and H2S) into...
Tipo: Journal article
Palavras-chave: Biodesulfurization; Biogas; Effluent from a sulfate reduction reactor; Sulfide.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200013

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

Meiotic study of Zea mays ssp. mays (2n = 40) x Tripsacum dactyloides (2 n = 72) hybrid and its progeny
Provedor de dados: 69
Autores: Molina,María del Carmen; García,María Dina; Chorzempa,Silvia Elena.
Maize (2n = 40) x Tripsacum dactyloides (2n = 72) F1 hybrid plants (2n = 56) were obtained by embryo rescue and induction of somatic embryogenesis/organogenesis. Hybrid plants showed Tripsacum-like phenotypes, tolerance to stresses such as NaCl salinity and low temperatures. The more frequent meiotic configurations were 28II (24%), 24II + 2IV (19%) and 26II + 1IV (12%), with an average per cell of 0.55I + 25.18II + 1.19IV. Significant differences between plants were not observed. Pollen fertility ranged from 0% to 50%. After pollination with maize or Tripsacum, 20% of F1 plants have developed viable seeds, which originated the progeny. Thirty five percent of the progeny showed 2n = 56 chromosomes and F1 like-phenotypes, which suggests they have apomictic...
Tipo: Journal article
Palavras-chave: Chromosome number; Corn; Eastern gamagrass; Remote hybridisation.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300020

Enhancing production of lipase MAS1 from marine Streptomyces sp. strain in Pichia pastoris by chaperones co-expression
Provedor de dados: 69
Autores: Lan,Dongming; Qu,Man; Yang,Bo; Wang,Yonghua.
Background: A thermostable lipase MAS1 from marine Streptomyces sp. strain was considered as a potential biocatalyst for industrial application, but its production level was relatively low. Here, the effect of chaperones co-expression on the secretory expression of lipase MAS1 in Pichia pastoris was investigated. Result: Co-expression of protein disulfide isomerase (PDI), HAC1 and immunoglobulin binding protein could increase the expression level of lipase MAS1, whereas co-expression of Vitreoscilla hemoglobin showed a negative effect to the lipase MAS1 production. Among them, PDI co-expression increased lipase MAS1 expression level by 1.7-fold compared to the control strain harboring only the MAS1 gene. Furthermore, optimizing production of lipase MAS1...
Tipo: Journal article
Palavras-chave: Fermentation optimization; Methanol fed-batch; Protein disulfide isomerase; Vitreoscilla hemoglobin.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400009

Evidence of a role for prolactin as regulators of ovarian follicular development in goose
Provedor de dados: 69
Autores: Ma,Rong; Jiang,Dongmei; Chen,Ziyu; Kang,Bo.
Background Prolactin (PRL) regulates development and reproduction, and its effects are mediated by the prolactin receptor (PRLR). In order to clarify the role of PRLR and PRL in the process of follicular development in the goose ovary, the level of PRLR mRNA expression in the ovary and follicles of the Sichuan white goose was determined, as well as the PRL concentration in ovarian follicles. Results The level of PRLR mRNA in the hierarchical follicles (HFs) initially increased, and subsequently decreased, whereas PRLR expression was initially low and later increased in postovulatory follicles (POFs). The level of PRLR mRNA expression was the highest in the F4 follicles, and lowest in the F1 follicles in all of the examined follicles. Compared with the...
Tipo: Journal article
Palavras-chave: Postovulatory follicle; Preovulatory follicle; Prolactin receptor; Prolactin; Sichuan white goose.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600001

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

Effects of temperature, pH and additives on the activity of tannase produced by Paecilomyces variotii
Provedor de dados: 69
Autores: Battestin,Vania; Macedo,Gabriela A.
A biochemical characterization of the tannase from a Paecilomyces variotii strain isolated in São Paulo, Brazil was carried out. Paecilomyces variotii is a strain obtained from the screening of five hundred fungi that were tested for their production of tannase. The enzyme produced was partially purified using ammonium sulfate precipitation followed by ion exchange chromatography, diethylaminoethyl (DEAE)-Sepharose. Effects of temperature and pH on the activity of crude tannase crude and purified tannase was studied. Km was found to be 0.61 µmol and Vmax = 0.55 U/mL. Temperature of 40 to 65ºC and pH 4.5 to 6.5 were optimum for tannase activity and stability; it could find potential use in the food-processing industry. The effects of different inhibitors,...
Tipo: Journal article
Palavras-chave: Characterization enzyme fermentation fungi Paecilomyces variotii; Tannase.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200003

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

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

Technological Strategies of Successful Latin American Biotechnological Firms
Provedor de dados: 69
This paper presents the results of the analysis of the technological strategies of eight Latin American biotech firms. There is little literature on strategies of follower firms in developing countries in high-technology sectors. For that reason, the authors undertook case studies of firms of six countries of Latin America that share the characteristics of being successful in the market place while adopting technology-follower strategies. The analysis considers five dimensions that, according to the literature on the management of technology, constitute the basic benchmarks of the strategy. These dimensions include innovating activities of the firm to improve, its position on the market; orientation of research and dominant technological goals; technology...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000100002

Heavy metal uptake by agro based waste materials
Provedor de dados: 69
Autores: Qaiser,Suleman; Saleemi,Anwar R; Mahmood Ahmad,Muhammad.
Presence of heavy metals in the aquatic systems has become a serious problem. As a result, there has been a great deal of attention given to new technologies for removal of heavy metal ions from contaminated waters. Biosorption is one such emerging technology which utilized naturally occurring waste materials to sequester heavy metals from industrial wastewater. The aim of the present study was to utilize the locally available agricultural waste materials for heavy metal removal from industrial wastewater. The wastewater containing lead and hexavalent chromium was treated with biomass prepared from ficus religiosa leaves. It was fund that a time of one hr was sufficient for sorption to attain equilibrium. The equilibrium sorption capacity after one hr was...
Tipo: Journal article
Palavras-chave: Biosorption; Ficus religiosa leaves; Hexavalent chromium; Kinetics; Lead; Wastewater.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300008

Expression of SOD transgene in pepper confer stress tolerance and improve shoot regeneration
Provedor de dados: 69
Autores: Chatzidimitriadou,Kiriaki; Nianiou-Obeidat,Irini; Madesis,Panagiotis; Perl-Treves,Rafael; Tsaftaris,Athanasios.
The objective of this work was to study the stress tolerance and regeneration capability of transgenic pepper plants carrying a sod gene, encoding a tomato chloroplast-localized Cu/Zn SOD protein. The expression of the sod gene was confirmed by enzymatic staining following polyacrylamide gel electrophoresis (PAGE), revealing a &amp;#8216;novel&amp;#8217; band, which could represent a heterodimeric enzyme. Transgenic T1 and T2 progeny plants were exposed to different oxidative stresses including Methyl viologen (MV) and drought and found to have an increased resistance to oxidative damage. Furthermore, the SOD carrying transgenic pepper plants showed increased levels of regeneration efficiency compared to the wild type pepper plants. Pepper is a...
Tipo: Journal article
Palavras-chave: Capsicum annum L.; Drought stress; MV; Regeneration; SOD.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400007

Transformation of high concentrations of chlorophenols by the white-rot basidiomycete Trametes versicolor immobilized on nylon mesh
Provedor de dados: 69
Autores: Sedarati,Mohammad R; Keshavarz,Tajalli; Leontievsky,Alexey A; Evans,Christine S.
Free-cell cultures of Trametes versicolor were compared with cultures immobilized on nylon mesh in a 2-litre bioreactor for transformation of pentachlorophenol (PCP) and 2,4-dichlorophenol (2,4-DCP), added at intervals to the liquid culture medium over a period of 816 hrs. Increasing amounts of PCP from 200 ppm to 2000 ppm added batchwise to cultures permitted acclimatization of the fungus to these toxic pollutants. A total addition of 2000 ppm of 2,4-DCP and 3400 ppm PCP were removed from the immobilized cultures with 85% of 2,4-DCP and 70% of PCP transformed by enzymes (laccase and Mn-peroxidase), 5% 2,4-DCP and 28% PCP adsorbed by the biomass and 10% 2,4-DCP and 2% PCP retained in the medium at the termination of the fermentation after 1020 hrs. In...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200005

Silanol - A novel class of antimicrobial agent
Provedor de dados: 69
Autores: Kim,Yun-mi; Farrah,Samuel; Baney,Ronald H.
Recently, a significant amount of attention has been directed toward development of novel classes of biocides because of the potential for microbial contamination and infection risks to military personnel and in the general population. We have recently discovered a new and unexpected class of powerful biocides based upon compounds derived through simple chemistry from silicone intermediates, "silicon alcohols" called, silanols. One example is trialkylsilanols, R3SiOH. Antimicrobial tests were carried out against Gram-negative bacterium, Escherichia coli, and Gram-positive, Staphylococcus aureus, with silanols, t-butanol, and siloxanes. Trialkylsilanols were very effective biocides against Escherichia coli and Staphylococcus aureus. The number of viable...
Tipo: Journal article
Palavras-chave: Antimicrobial agents; Bacteria; Biocide; Silanols.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200012

Prodigiosin found in Serratia marcescens y2 initiates phototoxicity in the cytomembrane
Provedor de dados: 69
Autores: Wang,Fei; Luo,Hailan; Song,Guohua; Liu,Chang; Wang,Jianguo; Xu,Jingliang; Su,Xiuhong; Ma,Xu Yuan.
Background: Light can be absorbed by bacterial pigment and affects its growth. Prodigiosin is a red pigment found in various bacterial species. The purpose of this study was to investigate the impacts of light on prodigiosin production, biomass formation, and membrane integrity of Serratia marcescens y2. Results: S. marcescens y2 grew better and produced more intracellular prodigiosin in darkness than in illumination. The pigment leakage ratio from cells was detected more in light than in darkness conditions. Ethidium bromide uptake assay could visually prove the prodigiosin-related loss of membrane integrity under illumination. A higher concentration of malondialdehyde (MDA) was detected in light-treated culture than in darkness. Tests of different light...
Tipo: Journal article
Palavras-chave: Ethidium bromide; Homogeneous light; Malondialdehyde; Red pigment.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400007

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

Medium-term and long-term in vitro conservation and safe international exchange of yam (Dioscorea spp.) germplasm
Provedor de dados: 69
Autores: Malaurie,Bernard; Trouslot,Marie-France; Berthaud,Julien; Bousalem,Mustapha; Pinel,Agnès; Dubern,Jean.
Yam edible tubers feed million of peoples in the intertropical area, where they represent 12% of human feeding. However, as a vegetatively propagated crop, yam is seriously affected by an accumulation of pathogens. Establishing in vitro germplasm collection is a process that cleans the plants from all diseases but viruses. It gives a good control on the preservation of the yam genetic resources and facilitates international exchanges of healthy plant material. Two kinds of in vitro germplasm preservation were considered : slow growth condition culture for mid-term preservation, and cryopreservation using the encapsulation/dehydration technique for long-term preservation. Virus eradication was approached by meristem culture and chemo and thermotherapy....
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000300001

Insect resistance and risk assessment studies of advanced generations of basmati rice expressing two genes of Bacillus thuringiensis
Provedor de dados: 69
Autores: Rahman,Mahmood-ur; Rashid,Hamza; Shahid,Ahmad Ali; Bashir,Khurram; Husnain,Tayyab; Riazuddin,Sheikh.
Advanced generations of different transgenic lines of indica basmati rice (Basmati-370) expressing two unrelated Bt genes, cry1Ac and cry2A were evaluated for resistance to Yellow Stem Borer (YSB) and Rice Leaf Folder (RLF) under field conditions compared to control lines over three years (2003-2005). Homozygous lines were selected and analyzed for insect resistance, morphological, physiochemical properties and risk assessment studies. After artificial infestation of target insects, the transgenic plants showed significant resistance. Data were recorded in terms of dead hearts and white heads at vegetative and flowering stage respectively. Transgenic lines showed up to 100 and 96% resistance against yellow stem borer at vegetative and flowering stages,...
Tipo: Journal article
Palavras-chave: Bio-safety; Cry1Ac; Cry2A; Gene flow; Field trials; Gene pyramiding; Insect resistance.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200008

Expression of RsMYB1 in chrysanthemum regulates key anthocyanin biosynthetic genes
Provedor de dados: 69
Autores: Naing,Aung Htay; Ai,Trinh Ngoc; Jeon,Su Min; Park,Kyeung Il; Lim,Ki Byung; Kim,Chang Kil.
Background Several MYB genes belonging to R2R3 MYB transcription factors have been used in several plant species to enhance anthocyanin production, and have shown various expression or regulation patterns. This study focused on the effect of ectopic expression of an RsMYB1 isolated from radish (Raphanus sativa) on chrysanthemum cv. ‘Shinma'. Results The RT-PCR results confirmed that RsMYB1 regulated the expression of three key biosynthetic genes (CmF3H, CmDFR, and CmANS) that are responsible for anthocyanin production in transgenic chrysanthemum, but were not detected in the non-transgenic line. In all transgenic plants, higher expression levels of key biosynthetic genes were observed in flowers than in leaves. However, the presence of RsMYB1 in...
Tipo: Journal article
Palavras-chave: Anthocyanin; Chrysanthemum; Morphology; RT- PCR; Transcription factor.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500006

Multiple model approach to modelling of Escherichia coli fed-batch cultivation extracellular production of bacterial phytase
Provedor de dados: 69
Autores: Roeva,Olympia; Pencheva,Tania; Tzonkov,Stoyan; Arndt,Michael; Hitzmann,Bernd; Kleist,Sofia; Miksch,Gerchard; Friehs,Karl; Flaschel,Erwin.
The paper presents the implementation of multiple model approach to modelling of Escherichia coli BL21(DE3)pPhyt109 fed-batch cultivation processes for an extracellular production of bacterial phytase. Due to the complex metabolic pathways of microorganisms, the accurate modelling of bioprocesses is rather difficult. Multiple model approach is an alternative concept which helps in modelling and control of complex processes. The main idea is the development of a model based on simple submodels for the purposes of further high quality process control. The presented simulations of E. coli fed-batch cultivation show how the process could be divided into different functional states and how the model parameters could be obtained easily using genetic algorithms....
Tipo: Journal article
Palavras-chave: Genetic algorithms; Modelling; Multiple model approach.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400012

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

Establishment of a HEK293T cell line able to site-specifically integrate and stably express GDNF by rAAV-2 vector
Provedor de dados: 69
Autores: Zhang,Jinju; Zhang,Yun; Liu,Xiaomei; Xiang,Jingjing; Zhang,Chun.
Background: Using recombinant adeno-associated virus 2 (rAAV-2), we attempted to establish a HEK293T cell line that is able to site-specifically integrate and stably express glial cell line-derived neurotrophic factor (GDNF). Results:Recombinant vector with enhanced green fluorescent protein (EGFP) and GDNF (pTR-P5-EGFP-IRES-GDNF), as well as that carrying Rep genes and SV40 promoters (pSVAV2) were constructed and packed. HEK293T cells were co-infected with rAAV-2/EGFP-GDNF and rAAV-2/SVAV2 virus separately at 1 x 10(4),1 x 10(5),and 1x10(6) of multiplicity of infection (MOI). The efficiency of transduction was detected using flow cytometry. Additionally, the infected HEK293T cells were separately validated by touchdown polymerase chain reaction (PCR) and...
Tipo: Journal article
Palavras-chave: Glial cell line-derived neurotrophic factor; Multiplicity of infection; Recombinant adeno-associated virus 2; Site-specific integration; Transduction.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400011

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

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

Phenolic compound production and biological activities from in vitro regenerated plants of gherkin (Cucumis anguria L.)
Provedor de dados: 69
Autores: Thiruvengadam,Muthu; Chung,Ill-Min.
Background The effect of polyamines (PAs) along with cytokinins (TDZ and BAP) and auxin (IBA) was induced by the multiple shoot regeneration from leaf explants of gherkin (Cucumis anguria L.). The polyphenolic content, antioxidant and antibacterial potential were studied from in vitro regenerated and in vivo plants. Results Murashige and Skoog (MS) medium supplemented with 3% sucrose containing a combination of 3.0 µM TDZ, 1.0 µM IBA and 75 µM spermidine induced maximum number of shoots (45 shoots per explant) was achieved. Regenerated shoots elongated in shoot elongation medium containing 1.5 µM GA3 and 50 µM spermine. The well-developed shoots were transferred to root induction medium containing 1.0 µM IBA and 50 µM putrescine. Rooted plants were...
Tipo: Journal article
Palavras-chave: Biological activities; Cucumis anguria; Multiple shoot induction; Plant growth regulators; Polyamines; Polyphenolic content.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400007

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

Removal of malachite green from water by Firmiana simplex wood fiber
Provedor de dados: 69
Autores: Pan,Xiangliang; Zhang,Daoyong.
This study shows that wood fiber of Phoenix tree (Firmiana simplex) is an effective adsorbent for malachite green (MG). MG sorption behavior onto the wood adsorbent was investigated in this study. Basic condition was favorable for MG adsorption to the adsorbent. The pseudo second order equation well described MG adsorption onto the wood adsorbent. The Freundlich Isotherm could describe the sorption data. The positive value of &amp;#916;H0 showed that adsorption of malachite green onto the wood adsorbent was endothermic. The negative values of &amp;#916;G at various temperatures indicate the spontaneous nature of the adsorption process.
Tipo: Journal article
Palavras-chave: Adsorption; Kinetics; Malachite green; Thermodynamics; Wood fiber.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400009

Optimization of beta-xylosidase recovery by reversed micelles using response surface methodology
Provedor de dados: 69
Autores: Hasmann,Francislene Andreia; Vieira Cortez,Daniela; Pessoa Júnior,Adalberto; Conceição Roberto,Inês.
beta-Xylosidase recovery by reversed micelles using CTAB cationic surfactant was performed under different experimental conditions. A 2²-full orthogonal design with center points was employed to optimize the recovery of this enzyme and to evaluate the influence of the factors CTAB (A) and butanol concentration (B) on the enzyme extraction. A mathematical model to represent the enzyme recovery as a function of A and B was proposed. According to the model, the CTAB and butanol concentrations necessary to attain the maximum beta-xylosidase recovery (43%) were 0.26 M and 29.4%, respectively. The results showed that the recovery value predicted by the model was similar to that obtained experimentally (44.3%).
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200009

Strategic approaches to informing the public about biotechnology in Latin America
Provedor de dados: 69
Autores: Traynor,Patricia L; Adonis,Marta; Gil,Lionel.
Abstract &lt;a href="http://fbpe/img/ejb/v10n2/a01/reprint.html"&gt;Reprint (PDF)&lt;/a&gt; The benefits of today's biotechnology products are not evident to consumers. The public will accept biotechnology only when individuals decide for themselves that biotec products will contribute to their personal well-being. To make such a decision, people will need greater awareness and understanding of how biotechnology will affect the environment, human health, local and national economies, and the well-being of society. A low level of awareness and understanding about biotechnology is characteristic of Latin America and the Caribbean countries, as elsewhere, efforts to remedy poor public perception often seem inadequate and do not reflect a well-designed...
Tipo: Journal article
Palavras-chave: Biotechnology; GMOs; Public perception.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200001

Marker-assisted backcrossing using microsatellites and validation of SCAR Phs marker for resistance to white mold in common bean
Provedor de dados: 69
Autores: Carneiro,Flávia Fernandes; Santos,João Bosco dos; Leite,Monik Evelin.
Molecular markers may accelerate selection through the identification of plants with higher proportion of recurrent parent genome, as well as identifying those plants bearing target alleles like quantitative traits loci (QTLs) for white mold resistance. The objectives of this work were: 1) to employ microsatellite markers (SSR) in order to accelerate the recovery of recurrent parent genome 2) to validate sequence characterized amplified region (SCAR) Phs associated with a QTL that confers resistance to white mold, as previously identified in bean populations. Lines G122 and M20 were crossed, which generated 267 F1 plants from backcross (BC) BC1 and 113 plants from backcross BC2.SSR polymorphic markers were adopted. The relationship between BC plants and...
Tipo: Journal article
Palavras-chave: Backcross; Genetic similarity; Phaseolus vulgaris; SCAR; Sclerotinia sclerotiorum; SSR assisted selection.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600009

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

Improved affinity selection using phage display technology and off-rate based selection
Provedor de dados: 69
Autores: Yuan,Bin; Schulz,Philip; Liu,Ruitian; Sierks,Michael R.
Flow systems such as a BIAcore biosensor can be very efficient tools to isolate high affinity antibody fragments from affinity matured phage display libraries. Here we show that using flow based selection, we can readily isolate a variant with a 35-fold higher affinity, especially with a 7 fold better off-rate, compared to the parent clone after only a single round of selection from a second generation affinity matured phage display library. The flow system represents a fast method to isolate affinity improved antibody fragments and can be particularly useful for isolating antibodies to antigens that have poor solubility, are toxic to the host cell, or prone to aggregation.
Tipo: Journal article
Palavras-chave: Affinity maturation; Beta-amyloid (Abeta); Dissociation rate; Phage display.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200011

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

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

Optimization in Agrobacterium-mediated transformation of Anthurium andraeanum using GFP as a reporter
Provedor de dados: 69
Autores: Zhao,Qing; Jing,Ji; Wang,Gang; Wang,Jie Hua; Feng,Yuan Yuan; Xing,Han Wen; Guan,Chun Feng.
Although Agrobacterium-mediated transformation protocols for many economically important plant species have been well established, protocol for a number of flowering plants including Anthurium andraeanum remains challenging. In this study, we report success in generating transgenic Anthurium andraeanum cv Arizona using Agrobacterium GV3101 strain harboring a binary vector carrying gfp as a reporter gene. The possibility of facilitating the screening process for transgenic plants expressing functional proteins using gfp marker was explored. In order to realize high transformation efficiency, different explant sources including undifferentiated callus pieces and petioles were compared for their regeneration efficiency and susceptibility to...
Tipo: Journal article
Palavras-chave: Cocultivation; Gene transfer; Green fluorescent protein; Regeneration.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500009

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

Genetic mapping of EST-SSR, SSR and InDel to improve saturation of genomic regions in a previously developed sunflower map
Provedor de dados: 69
Autores: Talia,Paola; Nishinakamasu,Verónica; Hopp,Horacio Esteban; Heinz,Ruth Amelia; Paniego,Norma.
In order to saturate a sunflower genetic map and facilitate marker-assisted selection (MAS) breeding for stress response, it is necessary to enhance map saturation with molecular markers localized in linkage groups associated to genomic regions involved in these traits. This work describes the identification and characterization of 1,134 simple sequence repeat (SSR) containing expressed sequence tags (EST) from unigenes available databases. Twelve of these functional markers as well as 41 public SSR markers were successfully localized in linkage groups, thus contributing to the saturation of specific regions on a reference genetic-linkage-map derived from recombinant inbred lines (RIL) mapping population from the cross between PAC2 x RHA266 lines. The...
Tipo: Journal article
Palavras-chave: EST-SSR; InDels; Linkage map; SSR; Sunflower.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600007

Preliminary results of using ESR to examine biofilms
Provedor de dados: 69
Autores: Whitehead,Neil Evan; Tani,Atushi; Kazue,Tazaki; Motoji,Ikeya.
This preliminary work shows ESR (Electron Spin Resonance) can be used to detect biofilms, particularly from Fe-metabolising bacteria. A film was detected by ESR as early as 1 day, hence possibly more sensitively than by fluorescent methods. Films can probably be detected as early as one hour. Spectra contain a very broad peak at g=2.13, probably due to ferrihydrite. Results of field experiments from streams and ponds in New Zealand and Japan, particularly the Minoh River, showed a general increase of ferrihydrite with time. Loss by exfoliation was later than 20 days. The rate of accumulation was faster in a nutrient-rich stagnant pond. Hematite (g=4.3) was often observed, magnetite (g=9) once, and usually small amounts of a common bacterial decay product....
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300011

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

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

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

The multinational biosafety project of the Organization of American States
Provedor de dados: 69
Autores: Verastegui,Javier; Martínez,Víctor; Roca,Willy; de Peña,Myriam; Gil,Lionel.
The Organization of American States is supporting the project "Biosafety Regulations in Latin America and The Caribbean within the framework of the International Biosafety Protocol". The general objective is to strengthen national skills for the assessment and management of risks of biotechnology food products, and to build up public awareness about their benefits and risks in the participant countries, with the ultimate goal to promote their safe and sustainable use within a protective and trusting environment for the public. The first phase has been focused on the evaluation of the political and regulatory systems in Chile, Peru and Colombia, identification of needs, and development of a series of biosafety seminar-workshops in the three countries, with...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100007

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

Effect of extrinsic and intrinsic parameters on inulinase production by Aspergillus niger ATCC 20611
Provedor de dados: 69
Autores: Dinarvand,Mojdeh; B. Ariff,Arbakariya; Moeini,Hassan; Masomian,Malihe; Mousavi,Seyed Sadegh; Nahavandi,Reza; Mustafa,Shuhaimi.
Background: Inulinase is a versatile enzyme from glycoside hydrolase family which targets the &amp;#946;-2, 1 linkage of fructopolymers. In the present study, the effect of medium composition and culture conditions on inulinase production by Aspergillus niger ATCC 20611 was investigated in shake-&amp;#64258;asks. Results: The highest extracellular inulinase (3199 U/ ml) was obtained in the presence of 25% (w/v) sucrose, 0.5% (w/v) meat extract, 1.5% (w/v) NaNO3 and 2.5 mM (v/v) Zn2+, at initial pH of 6.5, temperature 35ºC and 6% (v/v) of spores suspension in the agitation speed of 100 rpm. Surfactants showed an inhibitory effect on enzyme production. The optimum temperature for inulinase activity was found to be 50ºC. TLC analysis showed the presence of...
Tipo: Journal article
Palavras-chave: Aspergillus niger ATCC 20611; Culture optimization; Inulinase.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400005

Prospects for using transgenic resistance to insects in crop improvement
Provedor de dados: 69
Autores: Sharma,Hari C.; Sharma,Kiran K.; Seetharama,Nadoor; Ortiz,Rodomiro.
Integrated pest management has historically placed great hopes on host plant resistance. However, conventional host-plant resistance to insects involves quantitative traits at several loci. As a result, the progress has been slow and difficult to achieve. With the advent of genetic transformation techniques, it has become possible to clone and insert genes into the crop plants to confer resistance to insect pests. Resistance to insects has been demonstrated in transgenic plants expressing genes for delta-endotoxins from Bacillus thuringiensis (Bt), protease inhibitors, enzymes and plant lectins. Most of the plant derived genes produce chronic rather than toxic effects and some insect pests are not sensitive to some of these factors. The potential of plant...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000200001

Phage-resistance of Salmonella enterica serovar Enteritidis and pathogenesis in Caenorhabditis elegans is mediated by the lipopolysaccharide
Provedor de dados: 69
Autores: Santander,Javier; Robeson,James.
Phage therapy has been used in the past as an alternative therapy against bacterial pathogens. However, phage-resistant bacterial strains can emerge. Some studies show that these phage-resistant strains are avirulent. In this study, we report that phage-resistant strains of Salmonella enterica serovar Enteritidis (hereafter S. Enteritidis) were avirulent in the Caenorhabditis elegans animal model. We isolated phage-resistant strains of S. Enteritidis ATCC 13076 by using three lytic phages (f2&amp;#945;SE, f3&amp;#945;SE and f18&amp;#945;SE). In these mutants, we explored different virulence factors like lipopolysaccharide (LPS), virulence plasmid (Pla), motility and type I fimbriae, all of which may have effects on virulence and could furthermore be...
Tipo: Journal article
Palavras-chave: Animal model; Bacteriophage prophylaxis; Caenorhabditis elegans; Phage resistance; Salmonella.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400015

Removal of heavy metals by exopolymeric substances produced by resistant purple nonsulfur bacteria isolated from contaminated shrimp ponds
Provedor de dados: 69
Autores: Panwichian,Saijai; Kantachote,Duangporn; Wittayaweerasak,Banjong; Mallavarapu,Megharaj.
Two purple nonsulfur bacteria (PNSB) strains, Rhodobium marinum NW16 and Rhodobacter sphaeroides KMS24 were investigated for their potential to remove heavy metals (HMs) from contaminated shrimp pond water. Tolerance of both PNSB strains growing with both microaerobic-light and aerobic-dark conditions, based on their minimum inhibitory concentrations, was in the order of Cu2+ &gt; Zn2+ &gt; Cd2+ (Pb precipitation occurred at 0.34 mM). Results from a scanning electron microscope equipped with an energy dispersive X-ray spectrometer (SEM-EDX) indicated that Cu2+ and Zn2+ altered the cellular morphology of both strains and accumulated HMs were found in their cells. The highest amounts of both cations were found in their cell walls followed by the cytoplasm...
Tipo: Journal article
Palavras-chave: Contamination; Exopolymeric substances; Heavy metals; Photosynthetic bacteria; Shrimp farming.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400002

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

General and microbiological aspects of solid substrate fermentation
Provedor de dados: 69
Autores: Raimbault,Maurice.
At first some general considerations about specificity and characteristics of SSF, their advantages and disadvantages as compared to LSF, are presented. Microorganisms involved in solid substrate fermentations are identified, considering the better performances of filamentous fungi. The solid substrates and their basic macromolecular compounds are detailed in relation to this complex and heterogeneous system. Biomass measurement is examined in detail, as well as environmental factors, both essential for studying and optimising solid substrate fermentations.
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000300007

Evaluation of concentrated milk whey as a supplement for SF9 Spodoptera frugiperda cells in culture
Provedor de dados: 69
Autores: Batista,Fabiana R. X.; Pereira,Carlos A.; Mendonça,Ronaldo Z.; Moraes,Angela M.
Insect cell culture has become increasingly useful for the production of heterologous proteins as well as of baculovirus polyhedra, and several different culture media formulations can be employed for this purpose. The goal of this work was to assess the potential of lyophylized milk whey ultra filtration retentate (MWR) when associated to yeast extract (YE), glucose and Pluronic F68 (PF68) to partially replace fetal calf serum (FBS) in Spodoptera frugiperda Sf9 cells culture in Grace's medium, aiming AgMNPV baculovirus production. Batch cultivation results showed that the yeast extract and the milk whey concentrate effectively increased cell concentration to about half the level commonly verified for the Sf900II serum-free medium. A 4-fold increase in...
Tipo: Journal article
Palavras-chave: Baculovirus; Concentrated milk whey; Grace's medium; Insect cells; Media formulation; Spodoptera frugiperda Sf9.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500007

Engineering Escherichia coli for autoinducible production of n-butanol
Provedor de dados: 69
Autores: Wang,Qinglong; ding,Yi; Liu,Li; Shi,Jiping; Sun,Junsong; Xue,Yongchang.
Background Escherichia coli does not produce n-butanol naturally, but can be butanologenic when related enzymes were expressed using inducible elements on plasmids. In this study we attempted to confer E. coli strain capability of automatic excretion of the chemical by employing a native anaerobic promoter. Also, a novel DNA kit was designed for PCR preparation of linear DNA fragments to perform strain modification. The kit is primarily composed of two mother vectors, co-transformation of linear DNAs into E. coli can simultaneously introduce two butanol synthetic operons into the chromosome and create two in-frame gene deletions at targeted native loci. Results E. coli strain Bw2V carries plasmid pCNA-PHC and pENA-TA, both utilizes native anaerobic...
Tipo: Journal article
Palavras-chave: Anaerobic promoter; Escherichia coli; Metabolic engineering; N-Butanol; Recombination.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200013

Introgression of LTP2 gene through marker assisted backcross in barley (Hordeum vulgare L.)
Provedor de dados: 69
Autores: Mikolajczak,Krzysztof; Ogrodowicz,Piotr; Surma,Maria; Adamski,Tadeusz; Kuczyñska,Anetta.
Background: Marker-assisted introgression currently represents the most widely spread application of DNA markers as an aid to selection in plant breeding. New barley germplasm should be supplemented by genes that facilitate growth and development under stressful conditions. The homology search against known genes is a fundamental approach to identify genes among the generated sequences. This procedure can be utilized for SNP search in genes of predicted function of interest and associated gene ontology (GO). Results: Backcross breeding enhanced by marker selection may become a powerful method to transfer one or a few genes controlling a specific trait. In the study, the integrated approach of combining phenotypic selection with marker assisted backcross...
Tipo: Journal article
Palavras-chave: BC lines; Gene annotation; Semi-dwarf gene; Single nucleotide polymorphism spring barley; Marker selection; Marker-assisted backcrossing; Marker-assisted introgression; DNA markers; Selection in plant breeding.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600014

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

T-DNA insertional mutagenesis in Arabidopsis: a tool for functional genomics
Provedor de dados: 69
Autores: Radhamony,Resmi Nath; Mohan Prasad,Anand; Srinivasan,Ramamurthy.
With the availability of complete genome sequences of several organisms, the focus has shifted from structural genomics to functional genomics, specifically in plants where the complete genomic sequences are becoming available i.e., Arabidopsis and rice. Agrobacterium mediated transformation which is exploited for transgenic technology is also being used as an effective mutagen and as a tool for functional genomics in higher plants. Besides the fact that the insertion of T-DNA element into a gene can lead to loss or gain of function, ingenious use of a variety of vectors have led to the identification of genes and regulatory elements in Arabidopsis. In this review, we highlight the progress made in the field of functional genomics of Arabidopsis using...
Tipo: Journal article
Palavras-chave: Arabidopsis; Functional genomics; Insertional mutagenesis; Promoter trapping; T-DNA tagging.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100012

Isolation of high quality RNA from Polyporus umbellatus (Pers.) Fries
Provedor de dados: 69
Autores: Zhang,Yuejin; Qin,Yali; Guo,Lijun; Zhou,Zili; Liang,Zongsuo; Zhang,Chenlu; Guo,Hongbo.
Background: The dried sclerotium of medicinal fungus Polyporus umbellatus (Pers.) Fries has many pharmacological functions such as diuretic and anticancer activity, in which high-content polysaccharides may play an important role. However, RNA isolation is difficult in filamentous fungi and lacking in P. umbellatus. Results: Five methods for RNA extraction from five strains collected from four provinces were assessed for their ability to recover a high-quality RNA applicable for sequence-related amplification polymorphism (SRAP) PCR and GDP-D-mannose pyrophosphorylase (GMP) gene expression profiles. Both A260/A280 and A260/A230 ratios of the best Trizol Plus + RNAiso-mate for Plant Tissue method are around 2 with a yield of 1122.00 ± 0.21 ng &amp;#956;l-1....
Tipo: Journal article
Palavras-chave: Chuling; Medicinal fungus; Polyporus umbellatus; RNA isolation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500010

Potential application of protease isolated from Pseudomonas aeruginosa PD100
Provedor de dados: 69
Autores: Najafi,Mohsen Fathi; Deobagkar,Dileep; Deobagkar,Deepti.
A protease isolated from Pseudomonas aeruginosa PD100 could act in the presence of SDS and Tween 80. This protease could be useful for degradation of protein in the presence of solvent, dehairing of cow skin and degradation of natural proteins. The immobilized protease showed 15-20% increases in temperature stability and the entrapped enzyme retained 83% of its initial activity after six cycles. With respect to properties of the enzyme and its capability for degradation of different protein sources, this protease finds potential application for waste treatment, used in detergents and leather industry
Tipo: Journal article
Palavras-chave: Blood clot; Protease; Pseudomonas aeruginosa PD100; SDS; Solvent.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200009

Identification of differentially expressed genes in developing cotton fibers (Gossypium hirsutum L) through differential display
Provedor de dados: 69
Autores: Iqbal,Saima; Bashir,Aftab; Naseer,Hafiza Masooma; Ahmed,Moddassir; Malik,Kauser A.
Cotton fibers are differentiated, non-dividing cells that originate from the epidermal layer of developing ovules. To identify genes involved in cotton fiber development, we performed non-radioactive differential display reverse transcriptase PCR (DDRT-PCR) on the purified mRNA. This technique was tested on mRNA isolated from five different developmental stages of cotton fiber including 0, 5, 10, 15 and 20 DPA (days after pollination). The mRNA purified from total RNA was reversibly transcribed using three anchored oligo-dT primers. Polymerase chain reaction (PCR) amplification of each cDNA preparation was carried out in combination with seven arbitrary primers. The amplified products were resolved on 1% agarose gel containing ethidium bromide. DNA was...
Tipo: Journal article
Palavras-chave: Cotton fiber; Differentially expressed transcripts; Gossypium hirsutum; Non-radioactive.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100005

Influence of the pH of glutaraldehyde and the use of dextran aldehyde on the preparation of cross-linked enzyme aggregates (CLEAs) of lipase from Burkholderia cepacia
Provedor de dados: 69
Autores: Caballero Valdés,Eduardo; Wilson Soto,Lorena; Aroca Arcaya,Germán.
The preparation of cross-linked enzyme aggregates (CLEAs) of lipase has been a challenge due the low amount of lysine residues that lipases have on their surface. The results show that CLEAs prepared using dextran aldehyde (100-200KDa) have a higher hydrolysis activity and particle size (activities between 3186 Â± 21 U/g of CLEA and 4800 Â± 30 U/g of CLEA and particle sizes between 52.6 Â± 18.7 Âµm and 126.2 Â± 53.5 Âµm) than CLEAs prepared with glutaraldehyde (0.1 KDa) (activities between 894 Â± 16 U/g of CLEA and 2874 Â± 20 U/g of CLEA and particle sizes between 21.2 Â± 5.1 Âµm and 83.4 Â± 24.9 Âµm); Thermal stability assays of bioctalysts at 60ÂºC at pH 7.0 using phosphate buffer 25 mM showed that CLEAs prepared with dextran aldehyde have lower residual...
Tipo: Journal article
Palavras-chave: Albumin; Dextran aldehyde; Glutaraldehyde; Immobilisation; Lipase.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300010

Fibrinolytic protease production by new Streptomyces sp: DPUA 1576 from Amazon lichens
Provedor de dados: 69
Autores: M.M. Silva,Germana; Bezerra,Raquel P; Teixeira,José A; Porto,Tatiana S; Lima-Filho,José L; Porto,Ana Lúcia F.
Background Streptomyces sp. DPUA 1576 from Amazon lichens was studied to protease and fibrinolytic production. A 2² factorial experimental design was applied to optimize its protease enzyme production using two independent variables, namely soybean flour and glucose concentrations. Results The optimal conditions to obtain high protease production (83.42 U/mL) were 1.26% soybean flour and 1.23% glucose concentration. A polynomial model was fitted to correlate the relationship between the two variables and protease activity. In relation to fibrinolytic activity, the highest activity of 706.5 mm² was obtained at 1.7% soybean flour and 1.0% glucose concentration, which was 33% higher than plasmin. Fibrinolytic production was not optimized in the studied...
Tipo: Journal article
Palavras-chave: Actinomycetes; Factorial design; Glucose; Microbial enzymes; Soybean flour.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100004

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

Purification and characterization of ß-glucosidase from Melanocarpus sp. MTCC 3922
Provedor de dados: 69
Autores: Kaur,Jatinder; Chadha,Bhupinder S; Kumar,Badhan A; Kaur,Ghatora, S; Saini,Harvinder S.
This study reports the purification and characterization of ß-glucosidase from a newly isolated thermophilic fungus, Melanocarpus sp. Microbial Type Culture Collection (MTCC) 3922. The molecular weight of ß-glucosidase was determined to be ~ 92 and 102 kDa with SDS PAGE and gel filtration, respectively, and pI of ~ 4.1. It was optimally active at 60ºC and pH 6.0, though was stable at 50ºC and pH 5.0 - 6.0. The presence of DTT, mercaptoethanol and metal ions such as Na+, K+, Ca2+, Mg2+and Zn2+ positively influenced the activity of ß-glucosidase but the activity was inhibited in the presence of CuSO4. ß-Glucosidase recognized pNP- ß-glucopyranoside (pNPG) as the preferred substrate, and showed very low affinity for pNP- ß-D-cellobioside. Km and Vmax for the...
Tipo: Journal article
Palavras-chave: SS-glucosidase; Melanocarpus sp; Purification; Substrate specificity; Transglycosylation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200010

Sugar cane bagasse as feedstock for second generation ethanol production: Part I: Diluted acid pretreatment optimization
Provedor de dados: 69
Autores: Vargas Betancur,Gabriel J; Pereira Jr,Nei.
Tons of sugar cane bagasse are produced in Brazil as waste of the sugar and ethanol industries. This lignocellulosic material is a potential source for second-generation ethanol production. Diluted acid hydrolysis is one of the most efficient pretreatments for hemicellulosic solubilization. The hydrolysate obtained is rich in xylose, which can be converted to ethanol by Pichia stipitis. This work used a statistical approach and the severity factor to investigate the effects of factors associated with the diluted acid hydrolysis process (acid concentration, solid:liquid ratio and time of exposure) on various response variables (xylose concentration, hydrolysis yield, inhibitor concentration and hydrolysate fermentability). The severity factor had a strong...
Tipo: Journal article
Palavras-chave: Hemicellulose hydrolysis; Severity factor; Xylose.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300010

Enzymological characterization of pineapple extract for potential application in oak tasar (Antheraea proylei J.) silk cocoon cooking and reeling
Provedor de dados: 69
Autores: Rupachandra Singh,Laishram; Ranjana Devi,Yengkokpam; Kunjeshwori Devi,Sanjenbam.
Proteinases have the potential to effect partial solubilization of the proteinaceous gum sericin involved in binding the silk strands together in cocoon, an essential step in the silk cocoon cooking and reeling. Therefore, pineapple extract rich in cysteine proteinases was enzymologically characterized for its potential application in oak tasar (Antheraea proylei J.) silk cocoon cooking and reeling. Optimum sodium carbonate concentration (9.8 mM) and optimum temperature (60ºC) for the proteinase activity were determined. Though relatively thermostable, an enhanced activity loss was observed when the extract was incubated in the temperature range 70-90ºC with sodium carbonate. Bulk of the activity (80-83%) remained after 1 hr of time-dependent inactivation...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300005

Production of citric acid by Aspergillus niger using cane molasses in a stirred fermentor
Provedor de dados: 69
Autores: Ali,Sikander; Haq,Ikram-ul-; Qadeer,M.A.; Iqbal,Javed.
The present investigation deals with the kinetics of submerged citric acid fermentation by Aspergillus niger using blackstrap molasses as the basal fermentation media. A laboratory scale stirred fermentor of 15-L capacity having working volume of 9-L was used for cultivation process and nutritional analysis. Among the 10 stock cultures of Aspergillus niger, the strain GCBT7 was found to enhance citric acid production. This strain was subjected to parametric studies. Major effects were caused due to oxygen tension (1.0 l/l/min), pH value (6.0) and incubation temperature (30ºC). All fermentations were carried out following the growth on 150 g/l raw molasses sugars for 144 hours. Ferrocyanide (200 ppm) was used to control the trace metals present in the...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300010

Rapid multiplication and in vitro production of leaf biomass in Kaempferia galanga through tissue culture
Provedor de dados: 69
Autores: Parida,Reena; Mohanty,Sujata; Kuanar,Ananya; Nayak,Sanghamitra.
An efficient protocol has been established for rapid multiplication and in vitro production of leaf biomass in Kaempferia galanga L, a rare medicinal plant. Different plant growth regulators like Benzyladenine (BA), Indoleacetic acid (IAA), Indolebutyric acid (IBA), Napthaleneacetic acid (NAA) and adenine sulphates (Ads) have been tried for induction of multiple shoots using lateral bud of rhizome as explants. The highest rate of shoot multiplication (11.5 ± 0.6) shoot/explant as well as leaf biomass production (7.4 ± 0.3) gram/explant was observed on Murashige and Skoog medium supplemented with Benzyladenine (1 mg/l) and Indoleacetic acid (0.5 mg/l). Data of shoot multiplication and leaf biomass production were statistically analysed. Upon excission of...
Tipo: Journal article
Palavras-chave: Growth regulators; Kaempferia; In vitro propagation; Leaf biomass.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400005

Polymorphism of four microsatellites and their polymerisation effect on litter size in Boer goats
Provedor de dados: 69
Autores: Wang,Jian gang; Hou,Jin-Xing; Li,Guang; Zhu,Guang Qin; Cao,BinYun.
Background: Finding molecular markers linked to quantitative trait loci is the first step in marker-assisted selection (MAS). Microsatellites are excellent molecular markers because of their large numbers, even distribution in the genome, and high polymorphism. In this study, the polymerisation effect of four microsatellites (OarAE101, BM1329, BM143, and LSCV043) on litter size was analysed using microsatellite markers and pedigrees. Results: The results indicate that the polymerisation effect of four microsatellite loci significantly affected the litter size. E5E10F2F6G1G5H6H11 and E3E8F5F7G1G5H3H9 had the highest and lowest litter sizes in the F2 generation, respectively. The polymerisation effect value (v) of the E5E10 genotype was 3.18% higher than...
Tipo: Journal article
Palavras-chave: Microsatellite marker; Pedigrees; Polymerisation effect; Polymorphism.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400011

Molecular cloning and expression of a putative crustacean hyperglycemic hormone of Litopenaeus vannamei in Pichia pastoris
Provedor de dados: 69
Autores: Sánchez-Castrejón,Edna; Ponce-Rivas,Elizabeth; Aguilar,Manuel B; Díaz,Fernando.
Crustacean hyperglycemic hormone (CHH) is the most abundant and best studied member of the CHH/MIH/GIH neuropeptide hormone family. CHH plays a major role in controlling glucose levels in the hemolymph, and it also has significance in regulating molting, reproduction, and osmoregulation. In contrast, molt-inhibiting hormone (MIH) is responsible for maintaining animals in an intermolt stage. In this study, Liv-MIH-1 cDNA, which encodes a mature neuropeptide from the eyestalk of white shrimp, Litopenaeus vannamei, was expressed in methylotrophic yeast (Pichia pastoris KM71) under the control of an alcohol oxidase promoter. Recombinant Liv-MIH-1 was secreted into the culture medium using the &amp;#945;-factor prepro-sequence without Glu-Ala repeats. The...
Tipo: Journal article
Palavras-chave: CHH; Litopenaeus vannamei; Pichia pastoris; Recombinant protein.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400009

Endophytic microorganisms: a review on insect control and recent advances on tropical plants
Provedor de dados: 69
Autores: Azevedo,João Lúcio; Maccheroni Jr.,Walter; Pereira,José Odair; de Araújo,Welington Luiz.
In the past two decades, a great deal of information on the role of endophytic microorganisms in nature has been collected. The capability of colonizing internal host tissues has made endophytes valuable for agriculture as a tool to improve crop performance. In this review, we addressed the major topics concerning the control of insects-pests by endophytic microorganisms. Several examples of insect control are described, notably those involving the interactions between fungi and grazing grasses from temperate countries. The mechanisms by which endophytic fungi control insect attacks are listed and include toxin production as well as the influence of these compounds on plant and livestock and how their production may be affected by genetic and environmental...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000100004

Expression of a Haemonchus contortus cysteine protease in the baculovirus system
Provedor de dados: 69
Autores: Miranda-Miranda,Estefan; Murillo-Sánchez,María Hortensia; Cossío-Bayúgar,Raquel.
A Haemonchus contortus recombinant Cysteine Protease (CP) was expressed in the baculovirus system. The CP gene was isolated by PCR from H. contortus cDNA, the PCR amplicon was cloned downstream to the polihedrin promoter within a bacterial expression vector, Sf9 insect cells were used for simultaneous co-transfection with the CP-vector and baculovirus naked DNA, which originated recombinant viruses by homologous recombination capable to express recombinant CP in an insect cell culture. A recombinant protease was identified as a fusion protein with a Ni lithium affinity 6XHis group. Recombinant CP was purified by affinity chromatography to obtain active recombinant protease identified by H. contortus experimentally infested ovine sera on a western blot as a...
Tipo: Journal article
Palavras-chave: Haemonchosis; Molecular cloning; Recombinant protease; Synthetic substrates; Western blot.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200007

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

Frequency of transferable multiple antibiotic resistance amongst coliform bacteria isolated from a treated sewage effluent in Antofagasta, Chile
Provedor de dados: 69
Autores: Silva,Juan; Castillo,Gabriela; Callejas,Lorena; López,Héctor; Olmos,Janet.
Antibiotic-resistant coliform bacteria from raw and treated water from activated sludge of a sewage treatment plant were isolated on eosin methylene blue agar (EMB) plates in the separate presence of ampicillin, tetracycline, chloramphenicol and streptomycin. Antibiotic resistant coliforms obtained from inflow and effluent waters were studied to determine influences of treatment on the species composition, resistance patterns and transferable resistance in these bacteria. The bacterial counts obtained showed a high proportion of antibiotic resistant coliforms in the treated effluent. The resistant coliform species were eliminated at different rates by the treatment. Escherichia coli decreased, whereas the proportion of Klebsiella sp increased. The...
Tipo: Journal article
Palavras-chave: Antibiotic resistance; Coliforms; Plasmid; Sewage treatment; Water pollution.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500008

The use of rice straw broth as an appropriate medium to isolate purple nonsulfur bacteria from paddy fields
Provedor de dados: 69
Autores: Nunkaew,Tomorn; Kantachote,Duangporn; Nitoda,Teruhiko; Kanzaki,Hiroshi.
The aims were to explore an appropriate isolating medium for obtaining purple nonsulfur bacteria (PNSB) for use as biofertilizers in saline paddy fields and to obtain pure cultures. We therefore chose a defined isolating medium containing 0.25% NaCl, (Glutamate-Acetate broth, GA) and a rice straw broth to compare them for numbers of PNSB obtained, time to obtain pure cultures, diversity and costs. A total of 30 water and 30 sediment samples were collected from saline paddy fields in southern Thailand and used to isolate PNSB in both the isolating media. Based on 60 samples and a period of 13 days incubation under anaerobic light conditions, a greater number of samples produced PNSB growth in GA broth after only day 3; however, after that the rice straw...
Tipo: Journal article
Palavras-chave: Biofertilizer; Isolation; Paddy field; Purple nonsulfur bacteria; Rice straw broth.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600007

Expression and purification of soluble single-chain Fv against human fibroblast growth factor receptor 3 fused with Sumo tag in Escherichia coli
Provedor de dados: 69
Autores: Liu,Zixuan; Zhang,Jizhou; Fan,Hongqiong; Yin,Ruofeng; Zheng,Zhong; Xu,Qian; Liu,Qing; He,Haiting; Peng,Xiaofan; Wang,XinXin; Li,Xiaokun; Xiao,Yechen.
Background Overexpression or mutated activation of Fibroblast growth factor receptor 3 (FGFR3) is involved in the pathogenesis of many tumors. More and more studies focus on the potential usage of therapeutic antibodies against FGFR3. Results In this study, a novel single-chain Fv (ScFv) against FGFR3 was prepared and characterized. To achieve the soluble expression, ScFv was fused with Sumo (Small ubiquitin-related modifier) by polymerase chain reaction (PCR), and cloned into pET-20b. The recombinant bacteria were induced by 0.5 mM Isopropyl-ß-d-thiogalactopyranoside (IPTG) for 16 h at 20°C, and the supernatant liquid of Sumo-ScFv was harvested and purified by Ni-NTA chromatography. After being cleaved by the Sumo protease, the recombinant ScFv was...
Tipo: Journal article
Palavras-chave: Escherichia coli; Fibroblast growth factor receptor 3; Single-chain Fv antibody; Soluble expression; Sumo tag.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400008

Kinetic analysis and effect of culture medium and coating materials during free and immobilized cell cultures of Bifidobacterium animalis subsp. lactis Bb 12
Provedor de dados: 69
Autores: Jalili,Hasan; Razavi,Hadi; Safari,Mohammad; Amrane,Abdeltif.
Microencapsulation technique appears helpful for more protection of Bifidobacteria against acid inhibitory effect. The effect of medium composition and product inhibitory in free cell culture, as well as the effect of the coating materials in immobilized cells, on biomass growth, acid production and substrate utilization kinetics of Bifidobacterium animalis subsp. lactis Bb 12 in uncontrolled batch fermentation was examined. The Monod and the Luedeking and Piret equations with a product inhibition term involving toxic power terms improved model efficiency for both growth and production. The model showed that media and coating materials had an effect on toxic power terms. Cell immobilization had a positive impact on B. animalis culture. Kinetic analysis...
Tipo: Journal article
Palavras-chave: Bifidobacterium; Immobilization; Kinetic models; Medium composition.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300002

Microsatellites within genes and ESTs of the Pacific oyster Crassostrea gigas and their transferability in five other Crassostrea species
Provedor de dados: 69
Autores: Li,Qi; Liu,Shikai; Kong,Lingfeng.
We developed 15 novel polymorphic microsatellites for the Pacific oyster Crassostrea gigas by screening genes and expressed sequence tags (ESTs) found in GenBank. The number of alleles per locus ranged from two to 24 with an average of 8.7, and the values of observed heterozygosity (Ho) and expected heterozygosity (He) ranged from 0.026 to 0.750 and from 0.120 to 0.947, respectively. No significant pairwise linkage disequilibrium was detected among loci and eight loci conformed to Hardy-Weinberg equilibrium. Transferability of the markers was examined on five other Crassostrea species and all the markers were amplified successfully in at least one species. These new microsatellites should be useful for population genetics, parentage analysis and genome...
Tipo: Journal article
Palavras-chave: Indwelling medical devices; Infections; Surface attachment.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300015

Effect of nickel chloride on Arabidopsis genomic DNA and methylation of 18S rDNA
Provedor de dados: 69
Autores: Li,Zhongai; Chen,Xin; Li,Suoping; Wang,Zicheng.
Background In recent years, nickel (Ni) has been widely applied in industrial and agricultural production and has become a kind of environmental pollution. In this study, the effect of nickel chloride (NiCl2) with different concentrations on Arabidopsis genomic stability and DNA methylation has been demonstrated. The nucleolus variation and 18S rDNA methylation after NiCl2 treatment have been analyzed. Results The results are as follows: (1) The NiCl2 could result in heritable genomic methylation variations. The genomic DNA methylation variations have been detected by methylation-sensitive amplified polymorphism (MSAP) molecular markers, and the result showed that after NiCl2 treatment, there was methylation variation in T0 generation seedlings, and...
Tipo: Journal article
Palavras-chave: DNA methylation; Heavy metal; Methylation sensitive amplified polymorphism (MSAP); Nickel.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100010

Molecular characterization of 'Candidatus Liberibacter' species/strains causing huanglongbing disease of citrus in Kenya
Provedor de dados: 69
Autores: Magomere,Titus O; Obukosia,Silas D; Mutitu,Eunice; Ngichabe,Christopher; Olubayo,Florence; Shibairo,Solomon.
This study was undertaken to characterize the alpha subgroup of the proteobacteria causing the huanglongbing (HLB) disease of citrus from three different ecological zones of Kenya namely the Lower highlands (LH2, LH3, 1800-1900 m above sea level); Upper midlands (UM3, UM4, 1390-1475m), Lower midlands (LM5, LM4, LM3 of 1290-1340-1390m), by isolation and sequencing DNA encoding the L10 and L12 ribosomal proteins and the intergenic region. A 7I6-basepair DNA fragment was amplified and sequenced and consisted of 536 basepairs of DNA encoding the L10 protein, 44 basepairs of DNA intergenic region and 136 basepairs of DNA that partially encodes the L12 protein. Sequences of rpL10/L12 protein genes from Kenyan strains were 98% and 81% similar to the South African...
Tipo: Journal article
Palavras-chave: Citrus greening disease; DNA sequencing; Intergenic regions; Phylogeny; Ribosomal protein genes.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200005

Utilization and biodegradation of starch stillage (distillery wastewater)
Provedor de dados: 69
Autores: Krzywonos,Malgorzata; Cibis,Edmund; Miskiewicz,Tadeusz; Ryznar-Luty,Agnieszka.
Stillage (distillery wastewater) is the main by-product originating in distilleries, and its volume is approximately 10 times that of ethanol produced. It is not surprising that the utilization of the stillage raises serious problems, and that many attempts have been made all over the world to solve them. In Poland most of the ethanol (about 90%) is produced from starch-based feedstocks, i.e. grains and potatoes. Starch feedstocks are widely used for spirit production also in other European countries, as well as outside Europe. The manuscript provides an overview of global fuel ethanol production and information on methods used for starch-based stillage biodegradation and utilization. The methods presented in this paper have been classified into two major...
Tipo: Journal article
Palavras-chave: Biodegradation; Distillery; Ethanol; Starch stillage; Utilization.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000100006

Simultaneous saccharification and fermentation process of different cellulosic substrates using a recombinant Saccharomyces cerevisiae harbouring the &amp;#946;-glucosidase gene
Provedor de dados: 69
Autores: Ferreira,Verônica; Faber,Mariana de Oliveira; Mesquita,Sabrina da Silva; Pereira Jr,Nei.
In Brazil, the production of ethanol from sugarcane produces large amounts of lignocellulosic residues (bagasse and straw), which have been driving research and development for the production of second generation ethanol. In the present work, a recombinant Saccharomyces cerevisiae strain expressing the &amp;#946;-glucosidase gene from Humicola grisea was used for ethanol production from three different cellulosic sources by simultaneous saccharification and fermentation. Initially, a enzymatic pre-hydrolysis step was done with a solid:liquid ratio of 1:4, and an enzymatic load of 25 filter paper activity (FPU).g-1 of cellulosic substrate. Using sugarcane bagasse pretreated cellulignin, crystalline cellulose and carboxymethyl cellulose, 51.7 g L-1, 41.7 g...
Tipo: Journal article
Palavras-chave: Bioethanol; Lignocellulosic biomass; Sugarcane bagasse derived cellulignin.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000200005

Quantitative real-time PCR method to detect changes in specific transcript and total RNA amounts
Provedor de dados: 69
Autores: Baek,Kwang-Hyun; Skinner,Daniel Z.
Quantitative real-time PCR (qRT-PCR), used in conjunction with reverse transcriptase, has been applied to the determination of the number of copies of a transcript per unit mass of RNA, but did not indicate any change in the amount of total RNA per mass of tissue. In the present work, we described a simple method to use qRT-PCR to estimate the change in the amount of total RNA per unit mass of wheat (Triticum aestivum L.) tissue in response to cold temperature. Three qRT-PCR templates, i.e. control, cold-exposed, and one of RNA extracted from a sample consisting of equal masses of control and cold-exposed tissue, were analyzed. The number of copies of target transcript per unit mass of RNA was estimated from the three samples using standard qRT-PCR...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100008

Novel protocol to identify true hybrids in normal oleate x high oleate crosses in peanut
Provedor de dados: 69
Autores: Wang,Chuan Tang; Yu,Shan Lin; Zhang,Shu Wei; Wang,Xiu Zhen; Tang,Yue Yi; Zhang,Jian Cheng; Chen,Dian Xu.
A novel hybrid identification protocol was developed for F0:1 peanut seeds resulting from crosses between normal oleate cultivars with wild type FAD2B gene and high oleate genotypes with an A insertion in FAD2B gene. Presence of a series of overlapped peaks in trace file of the PCR product amplified with bF19/R1 primers was an indication of hybridity. This protocol may facilitate high oleate breeding and genetic studies in peanut.
Tipo: Journal article
Palavras-chave: Identification; NIRS; PCR; Peanut; True hybrid.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500018

Enzyme activity and thermostability of a non-specific nuclease from Yersinia enterocolitica subsp. palearctica by site-directed mutagenesis
Provedor de dados: 69
Autores: Zhang,Yu; Li,Zhen-Hua; Zheng,Wei; Tang,Zhen-Xing; Zhang,Zhi-Liang; Shi,Lu-E.
Background: To identify the critical amino acid residues that contribute to the high enzyme activity and good thermostability of Yersinia enterocolitica subsp. palearctica (Y. NSN), 15 mutants of Y. NSN were obtained by site-directed mutagenesis in this study. And their enzyme activity and thermostability were assayed. Effect of several factors on the enzyme activity and thermostability of Y. NSN, was also investigated. Results: The results showed that the I203F and D264E mutants retained approximately 75% and 70% enzyme activity, respectively, compared to the wild-type enzyme. In addition to the I203F and D264E mutants, the mutant E202A had an obvious influence on the thermostability of Y. NSN. According to the analysis of enzyme activity and...
Tipo: Journal article
Palavras-chave: Factors affecting enzyme activity; Nuclease; Mutation; Mutagenesis; Nucleases without sequence specificity.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600005

Food biotechnology and education
Provedor de dados: 69
Autores: Ramón,Daniel; Diamante,Alicia; Calvo,María Dolores.
It is clear that the future of our children will be marked by the development of two scientific disciplines: computing and biotechnology. Regarding the first, during recent years considerable progress have been done in many countries around the globe aimed at enhancing the teaching in these subjects and, at the same time, encouraging the use of computers in classrooms. On the contrary, training in biotechnology is absent in many secondary schools of the planet. This formative deficiency generates citizens whose opinion on the marketing of biotechnological products is easily manipulated by both defenders and opposers of biotechnology. This situation is of particular relevance when the item in question is food biotechnological applications that provoke an...
Tipo: Journal article
Palavras-chave: Food biotechnology; Genetically modified foods; Public perception; Young consumers.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500001

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

Organogenesis from leaf and internode explants of Ophiorrhiza prostrata, an anticancer drug (camptothecin) producing plant
Provedor de dados: 69
Autores: Shahanaz Beegum,A; Poulose Martin,Kottackal; Zhang,Chun-Lai; Nishitha,I. K.; Ligimol,; Slater,Adrian; Madhusoodanan,P. V.
Camptothecin (CPT) analogues and derivatives serve as a novel class of effective anticancer agents that exert their action against DNA topoisomerase I. This paper presents procedures for the rapid, high frequency regeneration of a camptothecin producing plant, Ophiorrhiza prostrata D. Don from leaf and internode explants via shoot organogenesis. The concentrations of plant growth regulators and explant types exhibited discrete roles in the efficacy of shoot induction. N6-benzyladenine (BA) was the most effective cytokinin for the induction of shoots. Murashige and Skoog (MS) medium with 8.87 µM BA and 2.46 µM indole-3-butyric acid (IBA) yielded the highest number of shoots from leaf and internode explants (76.0 and 90.8 shoots respectively). In the case of...
Tipo: Journal article
Palavras-chave: Camptothecin; Medicinal plant; Ophiorrhiza prostrata; Plant growth regulators.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100011

Golgins: coiled-coil-rich proteins associated with the Golgi Complex
Provedor de dados: 69
Autores: Chan,Edward K.L.; Fritzler,Marvin J.
Autoantibodies directed against self-antigens are characteristic features of a number of human diseases. In systemic rheumatic diseases, these include antibodies that react with extracellular molecules; the cell membrane; nuclear and cytoplasmic components. Our laboratories have been interested in understanding autoimmune responses in systemic lupus erythematosus and related disease states and using human autoantibody as molecular probes in studying the cell biology of target antigens. This review summarizes our research efforts in dissecting the autoimmune response to the Golgi complex via expression cloning using human autoantibodies. We have cloned 4 of 5 known Golgi autoantigens that are referred to as golgin-95/GM130, golgin-97, golgin-160/GCP170, and...
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000200001

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

Influence of buffer systems on Trichoderma reesei Rut C-30 morphology and cellulase production
Provedor de dados: 69
Autores: Ferreira,Susana M. P.; Duarte,Ana P.; Queiroz,João A.; Domingues,Fernanda C.
The cellulase enzyme production is a key issue in the enzymatic hydrolysis of lignocellulosic materials. Since fungal morphology influences the productivity of fungal fermentations, it is of major importance to well know the fungal behavior during culture for cellulase production. In this work, the influence of medium supplementation, with different buffer systems at two different concentrations and pH conditions, on the morphology of T. reesei Rut C-30 and cellulase production, was investigated. A medium without buffer was used as control. The results suggest that fungal morphology is significantly dependent on the addition of different buffer systems to the nutrient broth. The mycelial morphology shows a clear transition from clumped to pelleted forms in...
Tipo: Journal article
Palavras-chave: Buffer systems; Cellulase; Fungal morphology; Submerged cell growth; Trichoderma reesei Rut C-30.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300008

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

The molecular diversity analysis of Auricularia auricula-judae in China by nuclear ribosomal DNA intergenic spacer
Provedor de dados: 69
Autores: Li,Li; Zhong,Cai-hong; Bian,Yin-bing.
Background: For the crossbreeding of Auricularia auricula-judae, selecting the appropriated parents in hybridization is very important. However, the classification and diversity analysis of A. auricula-judae has been equivocal, due to the similarity of the fruiting body morphology and its susceptibility to environmental influences. For this purpose, the molecular diversity of 32 A. auricula-judae commercial cultivars in China was analyzed by using the nuclear ribosomal DNA intergenic spacer. Results: The complete nuclear rDNA gene complex of A. auricula-judae isolate is 11,210 bp long, and contains the 18S, 5.8S, and 28S rRNA gene as well as the ITS and IGS regions. Based on the sequence data, four more effective primer combinations for the IGS region of...
Tipo: Journal article
Palavras-chave: Gremplasm resource Genetic polymorphism Strain identification Ribosomal RNA genes.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100005

Production of heterologous cutinases by E. coli and improved enzyme formulation for application on plastic degradation
Provedor de dados: 69
Autores: Gomes,Daniela S; Matamá,Teresa; Cavaco-Paulo,Artur; Campos-Takaki,Galba M; Salgueiro,Alexandra A.
Background: The hydrolytic action of cutinases has been applied to the degradation of plastics. Polyethylene terephthalate (PET) have long half-life which constitutes a major problem for their treatment as urban solid residues. The aim of this work was to characterize and to improve stable the enzyme to optimize the process of degradation using enzymatic hydrolysis of PET by recombinant cutinases. Results: The wild type form of cutinase from Fusarium solani pisi and its C-terminal fusion to cellulose binding domain N1 from Cellulomonas fimi were produced by genetically modified Escherichia coli. The maximum activity of cutinases produced in Lactose Broth in the presence of ampicillin and isopropyl &amp;#946;-D-1-thiogalactopyranoside (IPTG) was 1.4 IU/mL....
Tipo: Journal article
Palavras-chave: Cutinase; Environmental application; Poly(ethylene terephthalate).
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500003

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

Extraction optimization of total triterpenoids from Jatropha curcas leaves using response surface methodology and evaluations of their antimicrobial and antioxidant capacities
Provedor de dados: 69
Autores: Wei,Lei; Zhang,Wei; Yin,Li; Yan,Fang; Xu,Ying; Chen,Fang.
Background Triterpenoids are multifunctional secondary metabolites in plants. But little information is available concerning the actual yield, optimal extraction method and pharmacologic activity with regard to triterpenoids from Jatropha curcas leaves (TJL). Hence, response surface methodology (RSM) was used to optimize the extraction parameters. The effects of three independent variables, namely liquid-to-solid ratio, ethanol concentration and extraction time on TJL yield were investigated. TJL obtained by silica column chromatography was tested against bacterial and fungal species relevant to oral disease and wounds through broth microdilution. Antioxidant activity was assessed using the 2,2-diphenyl-2-picrylhydrazyl and...
Tipo: Journal article
Palavras-chave: Box-Behnken design; Radical scavenging activity; Ultrasound-assistant extraction.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200005

The effects of ethylene on the HCl-extractability of trace elements during soybean seed germination
Provedor de dados: 69
Autores: Liu,Chunming; Zhao,Yixin; Liu,Jianfeng; Gen,Wanting; Cheng,Yunqing.
Background Ethylene is capable of promoting seed germination in some plant species. Mobilization of metals such as Fe, Cu, Mn, and Zn in mature seeds takes place when seeds are germinating. However, whether ethylene is involved in the regulation of soybean seed germination and metal element mobilization during early seed germination stage remains unknown. In the present study, seeds were treated with ethylene synthesis inhibitor aminoethoxyvinylglycine (AVG) and ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC), and double distilled H2O (ddH(2)0) treatment was used as control. Ethylene emission, ACC synthase (ACS) expression, ACS enzyme activity and Ca, Zn, Mn, Cu and Fe content in hypocotyls were qualified to analyze the relationship between...
Tipo: Journal article
Palavras-chave: ACC synthase; Bioavailability; Ethylene; Metallic elements; Seed germination; Soybean.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500001

Selection of bioantagonistic bacteria to be used in biological control of Rhizoctonia solani in tomato
Provedor de dados: 69
Autores: Montealegre,Jaime R.; Reyes,Rodrigo; Pérez,Luz María; Herrera,Rodrigo; Silva,Polyana; Besoain,Ximena.
Bacteria from the rhizoplane and surrounding soil of healthy and Rhizoctonia solani diseased tomato plants, cropped in greenhouse of the V Region of Chile, were collected. The best bacterial strains, based on their ability to control development of three R. solani isolates (identified as belonging to the anastomosis groups AG-2-1, AG&amp;#8209;4), were identified as B. subtilis (one isolate) and B. lentimorbus (two different isolates). All bacterial isolates resulted effective for the in vitro control of growth of all R. solani isolates, where the control mechanisms used by the bacteria do not involve the secretion of fungal cell wall hydrolytic enzymes. R. solani AG-2-1 was more sensitive than R. solani AG-4. On the other hand, all bacteria grew well in...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200006

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

Xylanolytic enzymes production by Aspergillus niger GS1 from solid-state fermentation on corn stover and their effect on ruminal digestibility
Provedor de dados: 69
Autores: Regalado,Carlos; Vázquez-Obregón,Immer; García-Almendárez,Blanca Estela; Domínguez-Domínguez,Jorge; Aguilera-Barreyro,Araceli; Amaro-Reyes,Aldo.
Hemicellulosic agricultural by-products such as corn stover (CS) are highly available materials which represent an opportunity to develop value added products. Native Aspergillus niger GS1 was used for solid-state fermentation (SSF) on alkali pre-treated CS (ACS) aimed to optimize xylanolytic enzymes production, and their effect on in vitro ruminal and true digestibility of ACS. Enzyme production was empirically modelled using a fractional factorial design 2(9-5), and the resulting significant factors were glucose, yeast extract and two mineral salts, which were arranged in a Draper-Lin optimization design at two levels. Predicted optimum xylanolytic activity of 33.6 U (mg protein)-1 was achieved at 48 hrs of SSF, and was validated by confirmatory...
Tipo: Journal article
Palavras-chave: Aspergillus niger GS1; Corn stover; Digestibility; Solid-state fermentation; Xylanolytic activity.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200009

Elicitation of peroxidase activity in genetically transformed root cultures of Beta vulgaris L.
Provedor de dados: 69
Autores: Rudrappa,Thimmaraju; Neelwarne,Bhagyalakshmi; Lakshmanan,Venkatachalam; Reddampalli Venkataramareddy,Sreedhar; Gokare Aswathanarayana,Ravishankar.
Genetically transformed roots of red beet produce copious levels of peroxidase (POD) - a multifunctional enzyme with a number of commercial applications. In an effort to elicit the POD activity, the cultures were treated with biotic elicitors such as dry cell powders of microbial cultures (0.1-0.5% w/v) and the respective culture filtrates (1-5% v/v). Similarly, abiotic elicitors, particularly metal ions (2-8 folds of that present in the nutrient medium), the plant hormone Thidiazuron (at 0.25-1 ppm) and other bio-molecules such as Glutathione (at 0.5-10 mM) and Methyl jasmonate (at 20-100 µM) were used. It was observed that dry cell powder of Candida versatilis significantly elicited the enzyme activity (3.52-fold higher than the control) followed by...
Tipo: Journal article
Palavras-chave: Aspergillus; Calcium; Culture filtrate; Dried cell powder; Elicitor; Glutathione; Methyljasmonate; Rhizophus; Thidiazuron.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500006

Protocol for regeneration in vitro of Arachis hypogaea L
Provedor de dados: 69
Autores: Cucco,María Florencia; Rossi Jaume,Alberto Daniel.
The regeneration of peanut Runner varieties grown in the South of the province of Cordoba, Argentina, was studied to count on a regeneration protocol, which is essential to perform genetic transformation of the plant. The induction of somatic embryos was evaluated in different peanut explants cultivated in Cordoba: cotyledons with and without embryos, epycotils and leaflets, of the Tegua, Nahuel and Florman INTA varieties. The induction medium consisted of MS salts with 30 g.l-1 sucrose, supplemented with the following hormones and herbicides: BAP, Picloram, DMA and 2,4-D. The highest percentage of embryogenic callus was produced cultivating epicotyls with 50 mg.l-1 2,4-D. The embryos obtained produced plantlets which, once acclimatized, reached the...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000200007

Plant prebiotics and human health: Biotechnology to breed prebiotic-rich nutritious food crops
Provedor de dados: 69
Autores: Dwivedi,Sangam; Sahrawat,Kanwar; Puppala,Naveen; Ortiz,Rodomiro.
Microbiota in the gut play essential roles in human health. Prebiotics are non-digestible complex carbohydrates that are fermented in the colon, yielding energy and short chain fatty acids, and selectively promote the growth of Bifidobacteria and Lactobacillae in the gastro-intestinal tract. Fructans and inulin are the best-characterized plant prebiotics. Many vegetable, root and tuber crops as well as some fruit crops are the best-known sources of prebiotic carbohydrates, while the prebiotic-rich grain crops include barley, chickpea, lentil, lupin, and wheat. Some prebiotic-rich crop germplasm have been reported in barley, chickpea, lentil, wheat, yacon, and Jerusalem artichoke. A few major quantitative trait loci and gene-based markers associated with...
Tipo: Journal article
Palavras-chave: Germplasm; Gut microbiota; Human health; Non-digestible fibers; Transgene.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500008

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

Improved growth model for two-stage continuous cultures of Lactobacillus helveticus
Provedor de dados: 69
Autores: Bouguettoucha,Abdallah; Balannec,Béatrice; Nacef,Saci; Amrane,Abdeltif.
An unstructured model for growth and lactic acid production during two-stage continuous cultures of Lactobacillus helveticus was previously developed. The Verlhust model was considered to describe growth kinetics. Production models was based on modified Luedeking-Piret expressions involving an inhibitory effect for the first stage (seed culture) and a nutritional limitation effect for the second stage (culture). To account for the decrease of the biomass concentration observed in the second stage, the dilution rate Dc was replaced by an exponential term of the dilution rate &lt;img border=0 width=84 height=36 src="http://fbpe/img/ejb/v13n5/a07/image002.gif" align=middle&gt;in the growth and product relations. Contrarily to the previous model, the important...
Tipo: Journal article
Palavras-chave: Continuous culture; Growth; Lactic acid fermentation; Substrate limitation; Unstructured models.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500007

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

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

Industrial derivative of tallow: a promising renewable substrate for microbial lipid, single-cell protein and lipase production by Yarrowia lipolytica
Provedor de dados: 69
Autores: Papanikolaou,Seraphim; Chevalot,Isabelle; Galiotou-Panayotou,Maria; Komaitis,Michael; Marc,Ivan; Aggelis,George.
The aim of the present study was to assess the potential of valorisation of a solid industrial derivative of tallow, composed of saturated free-fatty acids ("stearin"), by fermentations carried out by the yeast Yarrowia lipolytica ACA-DC 50109 in order to produce microbial lipid, biomass and extra-cellular lipase. High quantities of biomass were produced (biomass yield of around 1.1 ± 0.1 g of total biomass produced per g of fat consumed) when the organism was grown in shake flasks, regardless of the concentration of extra-cellular nitrogen present. Cellular lipids accumulated in notable quantities regardless of the nitrogen availability of the medium, though this process was clearly favoured at high initial fat and low initial nitrogen concentrations. The...
Tipo: Journal article
Palavras-chave: Lipase; Microbial lipids; Single-cell protein; Tallow; Yarrowia lipolytica.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300010

The genetic diversity of Sardinian myrtle (Myrtus communis L.) populations
Provedor de dados: 69
Autores: Melito,Sara; Chessa,Innocenza; Erre,Patrizia; Podani,János; Mulas,Maurizio.
Background: The myrtle (Myrtus communis) is a common shrub widespread in the Mediterranean Basin. Its fruit and leaves exhibit antioxidant, antibacterial and antifungal properties, and are used for their content of essential oils and for their medicinal properties, but most commonly as an ingredient in locally made liquor. The uncontrolled exploitation of natural stands has reduced both the species' geographical coverage and the size of individual populations. The selection of genotypes for controlled cultivation requires a characterization of the genetic diversity present both within and between populations. Results: Genotypic variation was evaluated using ISSR profiling and genetic diversity characterized using standard population genetics approaches....
Tipo: Journal article
Palavras-chave: Domestication; Genetic structure; Germplasm; ISSR genotyping.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600007

One-pot synthesis of graphene-chitosan nanocomposite modified carbon paste electrode for selective determination of dopamine
Provedor de dados: 69
Autores: Liu,Chang; Zhang,Jing; Yifeng,E; Yue,Jingli; Chen,Lianshan; Li,Donghui.
Background A simple, rapid, low-cost and environmentally friendly method was developed to determine dopamine (DA) in the presence of ascorbic (AA) and uric acid (UA) based on a novel technique to prepare a graphene-chitosan (GR-CS) nanocomposite and modify it on the surface of carbon paste electrode (CPE). For our design, CS acts as a media to disperse and stabilize GR, and then GR plays a key role to selective and sensitive determination of DA. Results Under physiological conditions, the linear range for dopamine was determined from 1 × 10- 4 to 2 × 10- 7 mol/L with a good correlation coefficient of 0.9961 in the presence of 1000-fold interference of AA and UA. The detection limit was estimated to be 9.82 × 10- 8 mol/L (S/N = 3). In order to study the...
Tipo: Journal article
Palavras-chave: Dopamine; Selective determination; Surface modification of carbon paste electrode; Technique of one-pot synthesis.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000400007

Oxidation of volatile reduced sulphur compounds in biotrickling filter inoculated with Thiobacillus thioparus
Provedor de dados: 69
Autores: Cáceres,Manuel; Morales,Marjorie; San Martín,Ricardo; Urrutia,Homero; Aroca,Germán.
Reduced volatile sulphur compounds generate an impact on the environment, because of the bad smell and its low odour threshold. Compared with the existing physicochemical technologies for their elimination, biotrickling filters are an economically and environmentally sustainable alternative. Usually mixed cultures of microorganisms are used for inoculating biotrickling filters, in this case a pure culture of Thiobacillus thioparus is used for generating a biofilm, allowing to measure its capacity for the oxidation of four volatile reduced sulphur compounds: hydrogen sulphide, dimethyl sulphide, methyl mercaptan and dimethyl disulphide, using a residence time of 0.033 hrs. The viable cells of the biofilm were quantified by epifluorescence microscopy,...
Tipo: Journal article
Palavras-chave: Biofiltration; Odour removal; Volatile sulphur reduced compounds.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500011

Network models in the study of metabolism
Provedor de dados: 69
Autores: Rodríguez,Arsenio; Infante,Diogenes.
The systematic study of the genetic fingerprint (genomics) and the biochemistry (metabolites) that goes with a specific cellular process requires the characterization of all the small molecules that form the profile of metabolites and the associated genes. The metabolome represents the collection of all the metabolites during certain process in an organism. The transcriptome represents the gene expression profile, all the messengers RNA in a defined condition. Then to understand the whole process, the studies of metabolites must be accompanied with studies of the gene expression, hence the metabolome must be accompanied by the transcriptome, so we can identify genes and metabolites whose synthesis is induced by a specific process, an infection or stress....
Tipo: Journal article
Palavras-chave: Graph theory; Metabolic networks; Metabolomic.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400011

Resistance to freezing in three Eucalyptus globulus Labill subspecies
Provedor de dados: 69
Autores: Moraga S.,Priscila; Escobar,René; Valenzuela A.,Sofía.
The resistance to low temperatures was assessed in seedlings of three subspecies of E. globulus (ssp globulus, ssp bicostata and ssp maidenii) of two different provenances. Lethal temperature 50 (LT50) was obtained by measuring the electrolytic conductivity, nucleation and freezing temperatures were obtained by thermal analysis and the total soluble carbohydrates concentration was determined through the phenol-sulphuric method. Results showed that the most resistant provenance corresponded to Bolaro Mountain of ssp maidenii with a LT50 lower than -9&amp;ordm;C. The provenance Moogora of ssp globulus, had a LT50 of -8.47&amp;ordm;C, which situates it, as the second most resistant to low temperatures. According to the nucleation and freezing temperatures,...
Tipo: Journal article
Palavras-chave: Cold resistance; Ssp bicostata; Ssp globulus; Ssp maidenii.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300026

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

The application of polymerized lipid vesicles as colorimetric biosensors for real-time detection of pathogens in drinking water
Provedor de dados: 69
Autores: Villalobos,Patricio; Chávez,María Isabel; Olguín,Yusser; Sánchez,Elizabeth; Valdés,Erika; Galindo,Raúl; Young,Manuel E.
The inadequate treatments given to the served waste water which are disposal to the rivers and sea coast are the major sources of faecal Microorganisms and enteric bacterial pathogens. They are among the most serious effects of water pollution bringing risks on public health. None of the current methods for detection of pathogens offer real-time on site solutions, are capable of delivering a simple visual detection signal, or can be easily instrumented as an indicator of the presence of a pathogen in water. The use of lipid vesicles incorporating Polydiacetylenes (PDAs) for the development of biosensors for &amp;#147;real-time&amp;#148; detection of pathogens has become an alternative, due to its potential for simple colorimetric response against harmful...
Tipo: Journal article
Palavras-chave: Bacterial detection; Biosensors; Lipid vesicles; PDA.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100004

Industrial and biotechnological applications of ligninolytic enzymes of the basidiomycota: A review
Provedor de dados: 69
Autores: Maciel,Márcia Jaqueline Mendonça; Silva,Ademir Castro e; Ribeiro,Helena Camarão Telles.
Ligninolytic enzymes of the basidiomycetes play a crucial role in the global carbon cycle. The demand for application of ligninolytic enzymes complexes of white-rot fungi in industry and biotechnology is ever increasing due to their use in a variety of processes. Ligninolytic enzymes have potential applications in a large number of fields, including the chemical, fuel, food, agricultural, paper, textile, cosmetic industrial sectors and more. This ligninolytic system of white-rot fungi is also directly involved in the degradation of various xenobiotic compounds and dyes. Their capacities to remove xenobiotic substances and produce polymeric products make them a useful tool for bioremediation purposes. This paper reviews the applications of ligninolytic...
Tipo: Journal article
Palavras-chave: Laccase; Lignin peroxidase; Manganese peroxidase; White-rot fungi.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600014

Production of ethanol from mesquite (Prosopis juliflora (SW) D.C.) pods mash by Zymomonas mobilis and Saccharomyces cerevisiae
Provedor de dados: 69
Autores: da Silva,Celiane Gomes Maia; Stamford,Tânia Lúcia Montenegro; de Andrade,Samara Alvachian Cardoso; de Souza,Evandro Leite; de Araújo,Janete Magali.
This study aimed to assess the use of mesquite pods hydrated mash as biomass for the growth of Saccharomyces cerevisiae UFEPEDA-1012 and Zymomonas mobilis UFEPEDA-205 and for ethanol production using a submerged fermentation. A 2³ factorial design was used to analyze the effects of the type of microorganism, time of fermentation and condition of cultivation on the ethanol production in mesquite pods mash (30 g 100 mL-1). From the obtained results the hydrated mesquite pods mash presented as a good substrate for the growth of S. cerevisiae and Z. mobilis in comparison to the standard media. The effect that most affected the ethanol production was the type of microorganism. The highest ethanol concentration (141.1 gL-1) was found when Z. mobilis was...
Tipo: Journal article
Palavras-chave: Ethanol; Mesquite; Saccharomyces cerevisiae; Zymomonas mobilis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500012

Modeling the kinetics of pyrite ash biodesulfurization by Saccharomyces cerevisiae and Acetobacter aceti in liquid state bioreactors
Provedor de dados: 69
Autores: Ermurat,Yakup.
Background: Modeling the kinetics of the biodesulphurization bioprocess for the refining of pyrite ash by Saccharomyces cerevisiae and Acetobacter aceti have been studied in batch-type liquid- state bioreactors. Results: The biodesulphurization experiments were performed at varying temperatures of 25ºC, 30ºC and 35ºC for eight weeks. Glucose, acetic acid and ethyl alcohol were used in the incubation media as substrates and acid sources. pH and oxidation reduction potential (ORP) observations have been determined weekly and the dissolved sulphur was measured at the end of the eight weeks trials. An equation calculating pH was derived from the iron oxidation reaction containing the ferric to ferrous iron [Fe+3/Fe+2] ratio as a variable. The Michaelis-Menten...
Tipo: Journal article
Palavras-chave: Acetobacter aceti biodesulfurization kinetics; Modeling pyrite ash Saccharomyces cerevisiae.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000200004

Utilization of genes encoding osmoprotectants in transgenic plants for enhanced abiotic stress tolerance
Provedor de dados: 69
Autores: Khan,Mohammad Sayyar; Ahmad,Dawood; Khan,Muhammad Adil.
Global agriculture in the context of growing and expanding populations is under huge pressure to provide increased food, feed, and fiber. The recent phenomenon of climate change has further added fuel to the fire. It has been practically established now that the global temperature has been on the increase with associated fluctuations in annual rainfall regimes, and the resultant drought and flood events and increasing soil and water salinization. These challenges would be met with the introduction and utilization of new technologies coupled with conventional approaches. In recent years, transgenic technology has been proved very effective in terms of production of improved varieties of crop plants, resistant to biotic stresses. The abiotic stresses such as...
Tipo: Journal article
Palavras-chave: Osmoprotectants; Salt stress; Tolerance; Transgenic plants.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400001

Evaluating kinetic and physiological features of rCHO-K1 cells cultured on microcarriers for production of a recombinant metalloprotease/disintegrin
Provedor de dados: 69
Autores: Swiech,Kamilla; da Silva,Gracinda M.C; Zangirolami,Teresa C; Iemma,Mônica R.C; Selistre-de-Araújo,Heloísa S; Suazo,Cláudio A.T.
We present kinetic and physiological data regarding the culturing of rCHO-K1 cells on various microcarriers, to evaluate the potential of this culture strategy for mass production of these cells and expression of a recombinant disintegrin. Cultures were performed in 500 mL spinner flasks in DMEM culture medium with 10% v/v fetal calf serum, gently shaken at 37ºC, pH 7.4, in a 10% v/v CO2 atmosphere. The following values were obtained, respectively, for the adhesion time-constant Ka (h) and specific growth rate &amp;#956;max (d-1) on each microcarrier: Cytodex 1 (0.91, 0.45), Cultispher S (0.28, 0.34), Immobasil FS (0.85, 0.52) and Pronectin F (5.12, 0.67). Metabolic characteristics showed some variation among the cultures with the four microcarriers, the...
Tipo: Journal article
Palavras-chave: Adhesion; Animal cell; CHO-K1; Growth; Microcarrier; Recombinant disintegrin.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200004

Effects of fermentation temperature on the composition of beer volatile compounds, organoleptic quality and spent yeast density
Provedor de dados: 69
Autores: Olaniran,Ademola O; Maharaj,Yushir R; Pillay,Balakrishna.
Production of good quality beer is dependent largely on the fermentation temperature and yeast strains employed during the brewing process, among others. In this study, effects of fermentation temperatures and yeast strain type on beer quality and spent yeast density produced after wort fermentation by two commercial yeast strains were investigated. Beer samples were assessed for colour, clarity and foam head stability using standard methods, whilst the compositions and concentration of Beer Volatile Compounds (BVCs) produced were assessed using GC-MS. The spent yeast density, measured as dry cell weight, ranged between 1.84 - 3.157 mg/ml for both yeast strains with the highest yield obtained at room temperature fermentation. A peak viable population of...
Tipo: Journal article
Palavras-chave: Beer volatile compounds; Fermentation temperature; Organoleptic quality; Spent yeast density.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200005

The accuracy of protein structure alignment servers
Provedor de dados: 69
Autores: Aslam,Naeem; Nadeem,Asif; Babar,Masroor Ellahi; Pervez,Muhammad Tariq; Aslam,Muhammad; Naveed,Nasir; Hussain,Tanveer; Shehzad,Wasim; Wasim,Muhammad; Bao,Zhang; Javed,Maryam.
Background: Protein structural alignment is one of the most fundamental and crucial areas of research in the domain of computational structural biology. Comparison of a protein structure with known structures helps to classify it as a new or belonging to a known group of proteins. This, in turn, is useful to determine the function of protein, its evolutionary relationship with other protein molecules and grasping principles underlying protein architecture and folding. Results: A large number of protein structure alignment methods are available. Each protein structure alignment tool has its own strengths and weaknesses that need to be highlighted. We compared and presented results ofsix most popular and publically available servers for protein structure...
Tipo: Journal article
Palavras-chave: Comparative study; Protein structure alignment tools; Web based servers.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000200002

Retroviral-mediated overexpression of human bone morphogenetic protein 2 affects human mesenchymal stem cells during monolayer proliferation: A cautionary note
Provedor de dados: 69
Autores: Neumann,Alexander J; Alini,Mauro; Archer,Charles W; Stoddart,Martin J.
Background: Retroviral vectors are commonly used for gene transfer applications and they represent an effective way to provide a sustained delivery of a bioactive factor in basic research and tissue engineering applications. Cells that have been transduced with retroviral vectors ex vivo are usually amplified on tissue culture plastic, for a prolonged period of time, in order to obtain sufficient cell numbers prior to the experiment of interest. However, the effect of the transgene product on the transduced cells, during this period of time, is rarely, if ever, investigated. The current study investigated if transduction with a VSG.G pseudotyped retroviral vector expressing human bone morphogenetic protein 2 (Rv.BMP-2) influences the gene expression...
Tipo: Journal article
Palavras-chave: Constitutive expression; Controls; Gene transfer; Monolayer expansion; Retrovirus.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000200007

Ethanol induction of laccase depends on nitrogen conditions of Pycnoporus sanguineus
Provedor de dados: 69
Autores: Hernández,Christian A; Sandoval,Norma; Mallerman,Julieta; García-Pérez,José Antonio; Farnet,Anne-Marie; Perraud-Gaime,Isabelle; Alarcón,Enrique.
Background Ethanol has been pointed out as a laccase inducer. However, there are controversial reports about its efficiency with some fungi. In this study, we hypothesized that ethanol laccase induced in Pycnoporus sanguineus depends on nitrogen nutriment conditions. To prove this, we assessed laccase production in submerged cultures of P. sanguineus, with different nitrogen concentrations and with, or without ethanol added in a factorial designed experiment. Results In order to analyze the effects of factors on the response variables, a factorial ANOVA, and response-surface models were performed. It was found that the nitrogen source was the main factor that affected laccase production in P. sanguineus. The treatments with yeast extract (2 g/L) and...
Tipo: Journal article
Palavras-chave: Enzyme production; Fungal metabolism; Phenoloxidases; Urea; Yeast extract.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400012

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

New stereoisomeric derivatives of jasmonic acid generated by biotransformation with the fungus Gibberella fujikuroi affect the viability of human cancer cells
Provedor de dados: 69
Autores: Carvajal,Marcela; Espinoza,Luis; Caggia,Silvia; Cardile,Venera; Garbarino,Juan A; Peña-Cortés,Hugo; Russo,Alessandra.
Background: Several studies have shown that (-)-Jasmonic acid, (+)-7-iso-Jasmonic acid and its methyl ester, methyl jasmonate, have anti-cancer activity in vitro and in vivo, exhibiting selective cytotoxicity towards cancer cells. The degree of activity of these molecules is strongly related to their stereochemistry. The biotransformation of known compounds, natural or synthesized, related to interesting biological activities, generates new molecules displaying new improved properties compared with the original ones, increasing its value and providing new more effective products. Therefore, based on the above rationales and observations, in this work a biotransformation protocol to modify the chemical structure of the plant hormone jasmonic acid by using...
Tipo: Journal article
Palavras-chave: Apoptosis; Biotransformations; Cancer cells; Cell vitality; Gibberella fujikuroi; Jasmonic acid.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200007

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

Polymorphisms of the bovine chemokine receptor-like 1 gene and their associations with meat quality traits in Qinchuan cattle (Bos taurus)
Provedor de dados: 69
Autores: Zhan,Xiaoli; Jiang,Bijie; Ma,Xianghui; Fu,Changzhen; Zan,Linsen.
Background: We investigated the polymorphisms of the bovine chemokine receptor-like 1(CMKLR1) gene. The coding region of CMKLR1 was screened in Qinchuan cattle by PCR-RFLP technology. Results: In this study, we discovered two single nucleotide polymorphisms (SNPs) (264G &gt; C and 762C &gt; T) in the coding region of the CMKLR1 gene. Hence, we described the BmgT120l and Pdm1 PCR-RFLP methods for detecting the 64G &gt; C and 762C &gt; T mutations, respectively. PCR-RFLP and sequencing were used to analyze the two loci of CMKLR1 gene in 324 individuals, which were randomly selected from breeding populations. Furthermore, meat quality traits in another 80 Qinchuan individuals were analyzed by the comparison between the genotypes and their phenotypic data....
Tipo: Journal article
Palavras-chave: CMKLR1 gene; Meat quality traits; PCR-RFLP; Qinchuan cattle; SNP.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000100003

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

Expression, purification and thermal stability evaluation of an engineered amaranth protein expressed in Escherichia coli
Provedor de dados: 69
Autores: Morales-Camacho,Jocksan I; Paredes-López,Octavio; Espinosa-Hernández,Edgar; Fernández Velasco,Daniel Alejandro; Luna-Suárez,Silvia.
Background: The acidic subunit of amarantin (AAC)-the predominant amaranth seed storage protein-has functional potential and its third variable region (VR) has been modified with antihypertensive peptides to improve this potential. Here, we modified the C-terminal in the fourth VR of AAC by inserting four VY antihypertensive peptides. This modified protein (AACM.4) was expressed in Escherichia coli. In addition, we also recombinantly expressed other derivatives of the amarantin protein. These include: unmodified amarantin acidic subunit (AAC); amarantin acidic subunit modified at the third VR with four VY peptides (AACM.3); and amarantin acidic subunit doubly modified, in the third VR with four VY peptides and in the fourth VR with the RIPP peptide...
Tipo: Journal article
Palavras-chave: Globulin 11S; Protein expression; Protein engineering; Thermal stability.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400007

Molecular dynamics simulations of active site mutants of rat liver arginase
Provedor de dados: 69
Autores: Canales,Mauricio; Westermeyer,Linda; Carvajal,Nelson.
By using molecular dynamics (MD) simulations and crystallographic data for rat liver arginase, the substrate positions in the active sites of native and mutant forms of the enzyme, were compared and correlated with known kinetic consequences of mutations. The mutants compared were His 141&lt;IMG SRC="/content/vol4/issue3/full/6/flecha2.gif" WIDTH=12 HEIGHT=9&gt;Phe and His 141&lt;IMG SRC="/content/vol4/issue3/full/6/flecha2.gif" WIDTH=12 HEIGHT=9&gt;Asn. The simulations show that mutation His141&lt;IMG SRC="/content/vol4/issue3/full/6/flecha2.gif" WIDTH=12 HEIGHT=9&gt;Asn gives the greatest divergence from the atomic coordinates, when compared with the control native enzyme. The mutant Asp128&lt;IMG SRC="/content/vol4/issue3/full/6/flecha2.gif" WIDTH=12...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300010

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

Fermentation technologies for the production of exopolysaccharide-synthesizing Lactobacillus rhamnosus concentrated cultures
Provedor de dados: 69
Autores: Champagne,Claude P; Gardner,Nancy J; Lacroix,Christophe.
The exopolysaccharide (EPS)-producing cultures such as Lactobacillus rhamnosus RW-9595M present a challenge for the culture producers because the high viscosity of the fermented growth medium makes it difficult to recover the cells by centrifugation or filtration. This study examined four approaches to reduce viscosity of the medium while producing high cell densities: incubation temperature, extended incubation in the stationary growth phase, production in alginate gel beads and fed-batch fermentation technology. Automated spectrophotometry (AS) was used to study the effects of temperature, pH and lactate level on growth of the strain. In AS assays, there was no significant difference in final maximal biomass production at temperatures ranging between...
Tipo: Journal article
Palavras-chave: Alginate beads; Fed-batch culture; Temperature.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200005

Effect of methyl branching of C8H18 alkanes and water activity on lipase-catalyzed enantioselective esterification of ibuprofen
Provedor de dados: 69
Autores: Gottemukkala,Vijay V; Saripella,Kalyan K; Kadari,Anil K; Neau,Steven H.
The purpose of this research was to study the effect of the methyl branching of a high log P alkane solvent and the water activity in the organic medium on the initial rate and the enantioselectivity of ibuprofen esterification catalyzed by Candida rugosa lipase. Resolution of ibuprofen is important because S-(+)-ibuprofen has the desired pharmacological activity, whereas the R-(-)-enantiomer causes much of the side effects. The Candida rugosa lipase-catalyzed reaction in isooctane at 40ºC and 0.73 water activity gave the best results, both in terms of the initial reaction rate and the enantioselectivity of the reaction. An increase in water activity allowed a higher reaction rate and enantiomeric excess in each of the four solvents. An increase in methyl...
Tipo: Journal article
Palavras-chave: Enantioselective; Esterification; Ibuprofen; Lipase; Solvent-effect; Water activity.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100002

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

Greenhouse evaluation on the performance of heat tolerant transgenic broccoli and genetic diversity analysis using inter simple sequence repeat (ISSR) markers
Provedor de dados: 69
Autores: Ravanfar,Seyed Ali; Aziz,Maheran Abdul; Shabanimofrad,Mahmoodreza; Samarfard,Samira.
Background: Broccoli, Brassica oleracea subsp. italica is one of the many valuable Brassica species which is still less cultured under in vitro condition. Heat tolerant transgenic and non-transgenic broccoli cv. Green Marvel plantlets with well-developed root system obtained through in vitro culture were transferred into disposable plastic pots containing sterilized potting mixture consisting of (peatgroTM) + coconut dust (2:1) and maintained in a growth chamber. Results: After one month, the hardened plantlets were transferred and maintained in a transgenic greenhouse. After four months of acclimatization in the transgenic greenhouse, the efficacy of HSP101 gene in increasing the heat tolerance of the transgenic broccoli was evaluated. Results showed that...
Tipo: Journal article
Palavras-chave: AtHSP101 gene; Brassica oleracea; ISSR; Transgenic broccoli.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500004

Expression profiles and polymorphism analysis of CDIPT gene on Qinchuan cattle
Provedor de dados: 69
Autores: Fu,Changzhen; Wang,Hong; Li,Yaokun; Wang,Jiali; Cheng,Gong; Wang,Hongbao; Yang,Wucai; Zan,Linsen.
Background CDIPT (CDP-diacylglycerol-inositol 3-phosphatidyltransferase, EC 2.7.8.11) was found on the cytoplasmic side of the Golgi apparatus and the endoplasmic reticulum. It was an integral membrane protein performing the last step in the de novo biosynthesis of phosphatidylinositol (PtdIns). In recent years, PtdIns has been considered to play an essential role in energy metabolism, fatty acid metabolic pathway and intracellular signal transduction in eukaryotic cells. Results In this study, the results of real-time polymerase chain reaction (PCR) showed that the expression of CDIPT gene was remarkably different in diverse tissues. We also detected the polymorphism of bovine CDIPT gene and analyzed its association with body measurement and meat quality...
Tipo: Journal article
Palavras-chave: Body measurement traits; Gene expression; Meat quality traits; PCR-RFLP; SNP.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000400004

Thermotolerant fermenting yeasts for simultaneous saccharification fermentation of lignocellulosic biomass
Provedor de dados: 69
Autores: Choudhary,Jairam; Singh,Surender; Nain,Lata.
Lignocellulosic biomass is the most abundant renewable source of energy that has been widely explored as second-generation biofuel feedstock. Despite more than four decades of research, the process of ethanol production from lignocellulosic (LC) biomass remains economically unfeasible. This is due to the high cost of enzymes, end-product inhibition of enzymes, and the need for cost-intensive inputs associated with a separate hydrolysis and fermentation (SHF) process. Thermotolerant yeast strains that can undergo fermentation at temperatures above 40°C are suitable alternatives for developing the simultaneous saccharification and fermentation (SSF) process to overcome the limitations of SHF. This review describes the various approaches to screen and develop...
Tipo: Journal article
Palavras-chave: Bioethanol; Biofuel; Enzymes; Genome shuffling; Lignocellulosic biomass.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300013

The effect of high concentrations of glycerol on the growth, metabolism and adaptation capacity of Clostridium butyricum DSP1
Provedor de dados: 69
Autores: Szymanowska-Powa&amp;#322;owska,Daria.
Background The production of biofuels from renewable energy sources is one of the most important issues in biotechnology today. The process is known to generate various by-products, for example glycerol that 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. The main drawback of that technology is the use of high concentrations of glycerol, which inhibits the growth of bacterial cells. Results This study investigated the impact of crude glycerol on Clostridium butyricum DSP1 and its ability to adapt to an environment of high osmotic pressure. It was found that a crude glycerol concentration of up to 70 g/L did not have an inhibitory effect on C. butyricum...
Tipo: Journal article
Palavras-chave: Batch culture Clostridium butyricum Environmental stress 1; 3-Propanediol Substrate resistant.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200011

Genetic diversity in two variants of Orobanche gracilis Sm. [var. gracilis and var. deludens (Beck) A. Pujadas] (Orobanchaceae) from different regions of Spain
Provedor de dados: 69
Autores: Román,Belén; Hernández,Rosabell; Pujadas-Salvá,Antonio José; Cubero,José Ignacio; Rubiales,Diego; Satovic,Zlatko.
The pattern of genetic variation among populations of two Orobanche gracilis Sm. taxa (var. gracilis and var. deludens (Beck) A. Pujadas) from Northern and Southern Spain growing on different hosts was analysed using RAPD markers. The diversity analysis within populations revealed a higher level of diversity in the populations from the North when compared to the Southern ones. The results of principal co-ordinate analysis (PCoA) based on Dice distances among samples clearly established the separation of samples according to the taxonomical variety and the geographical origin of each population. The Southern populations of both var. gracilis and var. deludens were more differentiated among them than those of var. gracilis from the North. The analysis of...
Tipo: Journal article
Palavras-chave: AMOVA; Molecular markers; Orobanche gracilis; Parasitic plants; Population genetics.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200006

Practical use of immobilized lysozyme for the remediation process of Escherichia coli in aqueous solution
Provedor de dados: 69
Autores: Alves,Carlucio R; Pimenta,Maria Gardenny R; Vieira,Regine H.S.F; Furtado,Roselayne F; Guedes,Maria Izabel F; Silva,Rui C.B; Assis,Odilio B.G.
The lysozyme enzyme was immobilized on vitreous surface (fragments with diameters of 0.3 and 1.0 mm) for remediation of the microorganism Escherichia coli JM 109 into fresh water and saline solutions with 0.9% NaCl (w/v). Characterization of enzymatic film was carried out by infrared spectroscopy and atomic force microscopy techniques. Bactericide activity of the enzyme was evaluated by spectrophotometric analysis. It was verified that the enzymatic film was strongly coupled with the vitreous surface. The topographic analysis demonstrated that the deposited film was uniform and homogeneous. It was observed bactericide activity of film deposited on vitreous surface with 0.3 mm in fresh and saline solutions. This fact was not verified to vitreous fragments...
Tipo: Journal article
Palavras-chave: Escherichia coli; Lysozyme; Self-assembly.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100015

The use of reactors in biomining processes
Provedor de dados: 69
Autores: Acevedo,Fernando.
Microbial processes applied to mining operations are gaining increasing interest in the last years. Potential and current applications include the mining of gold, copper and other heavy metals, desulfurization of coal and oil, tertiary recovery of oil and biosorption of metal ions. Currently, bacterial leaching of copper and biooxidation of refractory gold concentrates are well-established large-scale processes that are carried on using heaps and tank reactors. Heap operation is simple and adequate to handle large volumes of minerals, but their productivity and yields are limited because of the severe difficulties in exerting an adequate process control. On the other hand, reactors can economically handle moderate volumes of material, but they allow for a...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000300002

Phenolic antioxidants extraction from raspberry wastes assisted by-enzymes
Provedor de dados: 69
Autores: Laroze,Liza; Soto,Carmen; Zúñiga,María Elvira.
The effect of enzymatic hydrolysis on phenolic antioxidant extraction was studied in raspberry solid wastes. This by-product possesses high content of crude fiber (60%) and low values of protein, oil and ash. Raspberry fiber composition suggests that biocatalysts with cellulase, hemicellulase and pectinase activities would be useful for carrying out an enzymatically assisted antioxidant extraction. Hydro-alcoholic extraction was done using different commercial enzymes. Total phenol content and antioxidant activity of enzyme-hydrolyzed residue extracts were measured and compared with those obtained without enzyme application.All biocatalysts evaluated increased soluble solids in comparison to the non-enzymatic control. Among them, Grindamyl and Maxoliva...
Tipo: Journal article
Palavras-chave: Antioxidant activity; Enzymatic extraction; Phenolic compounds.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600011

Expression of Hemagglutinin-Neuraminidase and fusion epitopes of Newcastle Disease Virus in transgenic tobacco
Provedor de dados: 69
Autores: Ghaffar Shahriari,Amir; Bagheri,Abdolreza; Bassami,Mohammad Reza; Malekzadeh-Shafaroudi,Saeid; Afsharifar,Alireza; Niazi,Ali.
Background: Newcastle disease is an important avian infectious disease that brings about vast economic damage for poultry industry. Transgenic plants represent a cost-effective system for the production of therapeutic proteins and are widely used for the production of poultry vaccines. In an attempt to develop a recombinant vaccine, a plant expression binary vector pBI121, containing the genes encoding Hemagglutinin-Neuraminidase (HN) and Fusion (F) epitopes of Newcastle Disease Virus (NDV) under the control of CaMV35S promoter and NOS terminator was constructed and introduced into the tobacco ( Nicotiana tabacum) plant by Agrobacterium-mediated transformation. Results: Putative transgenic plants were screened in a selection medium containing 50 mg/L...
Tipo: Journal article
Palavras-chave: Agrobacterium tumefaciens; ELISA; Recombinant vaccine; Transgenic plants.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400006

Possibility of using apple pomaces in the process of propionic-acetic fermentation
Provedor de dados: 69
Autores: Piwowarek,Kamil; Lipi&amp;#324;ska,Edyta; Ha&amp;#263;-Szyma&amp;#324;czuk,El&amp;#380;bieta.
Background: In 2014, apple production in EU countries amounted to 11.8 million tonnes. A constant increase in the production of these fruits will lead to the accumulation of thousands of tonnes of apple pomace (production waste). The amount of industrial apples is the highest - their proportiononthe market is estimated at 50-60%, of which over 95% is processed into juice. The proportion of pomace in the traditional pressing method accounts for 20% offruits used. Results: Analysis of the growth dynamics of wild strain Propionibacterium freudenreichii T82 in micro-cultures using different carbon sources showed that the highest bacterial growth occurs in an environment with fructose and the most intense biosynthesis of metabolites was found in medium...
Tipo: Journal article
Palavras-chave: Acetic acid; By-products; Carbon sources; Propionibacterium; Propionic acid; Waste materials.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500001

Improvement of myrosinase activity of Aspergillus sp. NR4617 by chemical mutagenesis
Provedor de dados: 69
Autores: Rakariyatham,Nuansri; Butr-Indr,Bordin; Niamsup,Hataichanoke; Shank,Lalida.
A myrosinase (thioglucoside glucohydrolase or thioglucosidase, EC 3.2.3.147) producing fungus, Aspergillus sp. NR4617, was newly isolated from decayed soil sample obtained in Thailand and was subjected to single exposure to two chemical mutagens, ethyl methanesulfonate (EMS) and N-methyl-N'-nitro-N-nitrosoguanidine (MNNG). Its myrosinase production was selected on low cost medium prepared from mustard seed cake (Brassica juncea). Studies of production and stability of the enzyme showed that EMS mutagenesis increased myrosinase activity. Aspergillus sp. NR4617E1 produced myrosinase 1.90 U ml-1 at 36 hrs of the cultivation equivalent to 171% of the enzyme production in wild-type. The stability studies revealed that myrosinase from the mutant strains retained...
Tipo: Journal article
Palavras-chave: Allylisothiocyanate; Aspergillus sp.; B-thioglucosidase; Myrosinase; EMS mutagenesis; MNNG mutagenesis.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400005

Strategies for introducing non-radioactive labels during the automated sequence analysis of nucleic acids.
Provedor de dados: 69
Autores: Igloi,Gabor L.
Rapid, large-scale genome as well as diagnostic DNA sequencing projects are, at present, dependent on the use of sensitive automated sequencers that rely on the detection of fluorescent signals. This emission is not an intrinsic property of the biomolecules but is a property of an optical label that must be incorporated before, during or after the sequence specific reaction. The choice of strategy, that is to be reviewed here, is a function of both the chemistry and the enzymology of the system as well as the nature of the fractionation and the physical parameters of the detection. One may differentiate beween the labelling of the primer, incorporation of the label during elongation or base specific termination with labelled terminators. In reviewing the...
Tipo: Journal article
Palavras-chave: Automated sequencing; Non-radioactive labelling; Nucleic acid analysis.
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000100003

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

Interaction of Acidithiobacillus ferrooxidans, Rhizobium phaseoli and Rhodotorula sp. in bioleaching process based on Lotka-Volterra model
Provedor de dados: 69
Autores: Zheng,Xuecheng; Li,Dongwei.
Background: Nowadays, leaching-ore bacteria, especially Acidithiobacillus ferrooxidans is widely used to retrieve heavy metals, many researches reflected that extra adding microorganism could promote bioleaching efficiency by different mechanisms, but few of them discussed the interaction between microorganisms and based on growth model. This study aimed to provide theoretical support for the collaborative bioleaching of multiple microorganisms by using the Lotka-Volterra (L-V) model. Results: This study investigated the interaction of Acidithiobacillus ferrooxidans, Rhizobium phaseoli,and Rhodotorula sp. Results showed that the individual growth of the three microorganisms fit the logistic curves. The environmental capacities of A. ferrooxidans, R....
Tipo: Journal article
Palavras-chave: Cell concentration; Collaboration; Commensalism; Mutualism.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400013

Marine genome resource sustainability in Central America
Provedor de dados: 69
Autores: Huete-Pérez,Jorge A; Roberts,Richard J; Quezada,Fernando.
In an effort to raise awareness of the major environmental challenges facing the region’s coastal and marine ecosystems, and to highlight the potential research and socioeconomic benefits of this program, the authors provide summaries of key lectures and conclusions presented in the international conference on Central American Marine Biodiversity and Genomics, in April of 2012, dedicated to “Genomic Archiving and Coastal Marine Biodiversity Exploration, Conservation and Sustainable Development”, and describe the main components of the initiative for the benefit of other actors, stakeholders and donors in the field of marine biodiversity.
Tipo: Journal article
Palavras-chave: Central American Marine Genomic Initiative; Marine biodiversity.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500013

Genetic engineering applications in animal breeding
Provedor de dados: 69
Autores: Montaldo,Hugo H.
This paper discusses the use of genetic engineering applications in animal breeding, including a description of the methods, their potential and current uses and ethical issues. Genetic engineering is the name of a group of techniques used to identify, replicate, modify and transfer the genetic material of cells, tissues or complete organisms. Important applications of genetic engineering in animal breeding are: 1) Marker-assisted selection (MAS). The objective of this technology is to increase disease resistance, productivity and product quality in economically important animals by adding information of DNA markers to phenotypes and genealogies for selection decisions. 2) Transgenesis, the direct transfer of specific genes/alleles between individuals,...
Tipo: Journal article
Palavras-chave: Adult mammalian cloning; Biotechnology; Gene mapping; GMOS; MAS; QTL; Transgenics.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200010

Molecular cloning, characterization and expression analysis of CpCBF2 gene in harvested papaya fruit under temperature stresses
Provedor de dados: 69
Autores: Zhu,Xiaoyang; Li,Xueping; Chen,Weixin; Lu,Wangjin; Mao,Jia; Liu,Tongxin.
Background: C-repeat binding factors (CBFs) are transcription factors that regulate the expression of a number of genes related to abiotic stresses. Few CBF genes have been cloned from other plants but no report in papaya. In present study, a full-length cDNA, designated as CpCBF2, was cloned from papaya using in silico cloning and 5&amp;#8217;- rapid amplification cDNA ends (RACE). Sequence analysis was performed to understand the gene function. The expression pattern of CpCBF2 in papaya under low (7ºC) and high temperature (35ºC) stresses was examined using real-time quantitative polymerase chain reaction (RT-qPCR). Results: The full-length cDNA of CpCBF2 was 986-bp, with a 762-bp open reading frame (ORF) encoding a 254 amino acid polypeptide. CpCBF2...
Tipo: Journal article
Palavras-chave: CpCBF2; Gene expression; Papaya; Temperature stresses.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400001

Stability inside hen eggs of a Salmonella enterica serovar Enteritidis bacteriophage
Provedor de dados: 69
Autores: Robeson,James; Valencia,Martina; Retamales,Julio; Borie,Consuelo.
Background: Bacteriophages are viruses that infect bacteria and therefore are widespread in nature. Those that lyse the pathogen Salmonella enterica serovar Enteritidis (SE) should be expected in niches in which this bacterium thrives, among others the avian egg. Furthermore, bacteriophages could remain viable in this milieu. Results: Upon artificially infecting hen eggs with the SE bacteriophage f18 we found that the bacteriophage titer remains stable at least for up to 144 hrs post-infection , both in yolk and albumen at 25ºC. Conclusion: Bacteriophage f18 withstands the physico-chemical conditions of the egg inner milieu and could be considered for SE-controlling measures in the poultry industry.
Tipo: Journal article
Palavras-chave: Bacteriophage; Egg; Enteritidis; Salmonella.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400011

Effect of nitrogen, carbon sources and agitation speed on acetoin production of Bacillus subtilis SF4-3
Provedor de dados: 69
Autores: Tian,Yanjun; Fan,Yixiao; Liu,Jianjun; Zhao,Xiangying; Chen,Wei.
Background: Currently, microbial fermentation method has become the research hotspot for acetoin production. In our previous work, an acetoin-producing strain, Bacillus subtilis SF4-3, was isolated from Japanese traditional fermented food natto. However, its conversion of glucose to acetoin was relatively low. In order to achieve a high-efficient accumulation of acetoin in B. subtilis SF4-3, main medium components and fermentation conditions were evaluated in this work. Results: The by-products analysis showed that there existed reversible transformation between acetoin and 2,3-butanediol that was strictly responsible for acetoin production in B. subtilis SF4-3. The carbon sources, nitrogen sources and agitation speed were determined to play crucial role...
Tipo: Journal article
Palavras-chave: 2; 3-Butanediol Acetoin Bacillus subtilis SF4-3 Reversible transformation.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100007

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

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

Meat tenderness genetic polymorphisms occurrence and distribution in five Zebu breeds in Mexico
Provedor de dados: 69
Autores: Parra-Bracamonte,Gaspar Manuel; Martínez-González,Juan C; Sifuentes-Rincón,Ana M; Moreno-Medina,Victor R; Ortega-Rivas,Eligio.
Background The Zebu cattle are represented by a diverse group of breeds in México. Traditionally these breeds have been associated with the tough beef characteristic. Validated genetic markers have the potential to be included in marker-assisted selection and management programs in order to improve traits such as beef tenderness. The incidence and distribution of Calpain and Calpastatin polymorphisms strongly associated with beef tenderness were estimated in registered cattle of five Zebu breeds in Mexico. Results A low and in some cases null frequency of favorable C allele of CAPN316 was determined in all breeds. Conversely, a more equilibrated frequency in CAPN4751 and CAST loci was observed. Conclusions Although the relatively low occurrence of...
Tipo: Journal article
Palavras-chave: Calpain; Calpastatin; Frequencies; Genotype; SNP.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500007

Evaluation of fitness in F2 generations of Africa Biofortified Sorghum event 188 and weedy Sorghum bicolor ssp. drummondii
Provedor de dados: 69
Autores: Magomere,Titus; Obukosia,Silas; Albertsen,Mark; Wambugu,Florence; Kamanga,Daniel; Njuguna,Michael; Gaffney,Jim; Zhao,Zuo-Yu; Che,Ping; Aseta,Antony; Kimani,Esther; Mwasame,Evans.
Background: Introgression of transgenes from crops to their wild species may enhance the adaptive advantage and therefore the invasiveness of and weedy forms. The study evaluated the effect of Africa Biofortified Sorghum (ABS) genes from ABS event 188 on the vegetative and reproductive features of the F2 populations derived from crosses with Sorghum bicolor subsp. drummondii. Results: F1 populations were obtained from reciprocal crosses involving ABS event 188 and its null segregant with inbred weedy parents from S. bicolor subsp. drummondii. Four F2 populations and four parental populations were raised in RCBD with 4 replications in a confined field plot for two seasons. Vegetative and reproductive traits were evaluated. The vigour shown in the F2...
Tipo: Journal article
Palavras-chave: Beta-carotene; Heterosis; Transgenics; Phospho-mannose isomarese.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400008

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

Therapeutic angiogenesis following intramuscular gene transfer of vascular endothelialgrowth factor 121 in a dog model of hindlimb ischemia
Provedor de dados: 69
Autores: Ojalvo,Ariana G.; Seralena,Alina; Vázquez,Raysa; Montequín,José F; Vispo,Nelson S.; Silva,Ricardo; Aldama,Alfredo; Puchades,Yaquelin; Sorell,Luis T.; Lopez-Saura,Pedro; Alfonso,María A.; Simón,Rafael; Alí,Alfonso; Seuc,Armando; Herrera,Luis.
Abstract &lt;A HREF="../../../../fbpe/img/ejb/v6n3/a02/bip/bip.html"&gt;Reprint (BIP)&lt;/A&gt; &lt;A HREF="../../../../fbpe/img/ejb/v6n3/a02/reprint.html"&gt;Reprint (PDF)&lt;/A&gt; Abstract &lt;A HREF="#article"&gt;Article &lt;/A&gt; &lt;A HREF="#references"&gt;References &lt;/A&gt; Vascular endothelial growth factor (VEGF), an endothelial cell-specific mitogen, has been shown to promote therapeutic angiogenesis in animal models of critical limb ischemia. Ischemic skeletal muscle is advantageous for taking up and expressing foreign genes transferred as naked plasmid DNA. Accordingly, we investigated the hypothesis that intramuscular administration of naked plasmid DNA encoding the 121-amino acid isoform of VEGF could augment collateral development and...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300006

GMOs and Development
Provedor de dados: 69
Autores: DaSilva,Edgar J.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200001

Enhancing DNA electrotransformation efficiency in Escherichia coli DH10B electrocompetent cells
Provedor de dados: 69
Autores: Wu,Ning; Matand,Kanyand; Kebede,Bizuayehu; Acquaah,George; Williams,Sonya.
Electrotransformation also known as electroporation is the most reliable and efficient tool for plasmid DNA uptake. Electrotransformation efficiency is function of many factors which include (1) number of cell washes prior to electroporation, (2) electroporation cell number, (3) electroporation DNA amount, and (4) cell growth phase. Those factors have limitedly been concomitantly investigated in E. coli DH10B strain. This study is aimed to explore above key factors to define the optimal conditions for high electrotransformation efficiency. The results showed that electrotransformation efficiency of E. coli DH10B was enhanced to 1.5 x 10(9) cfu/µg by washing cells three times with 15 ml of 10% glycerol. This washed off extra salts from cell suspension and...
Tipo: Journal article
Palavras-chave: Cell competency; DNA; E. coli DH10B; Electroporation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500021

Genetic diversity of Brassica oleracea var. capitata gene bank accessions assessed by AFLP
Provedor de dados: 69
Autores: Faltusová,Zuzana; Kuera,Ladislav; Ovesná,Jaroslava.
The genetic diversity of 20 cabbage (Brassica oleracea var. capitata, including sub.var. alba and rubra) cultivars and landraces from the Gene bank of Crop Research Institute was estimated using amplified fragment length polymorphism (AFLP) marker technology. Two cultivars of Brassica pekinensis (syn. Brassica rapa var. pekinensis) were used as outliers in the study. Thirty AFLP primer combinations produced a total of 1084 fragments. A total of 806 fragments, 364 (45%) of them polymorphic, were found across 20 Brassica oleracea var. capitata accessions. The accessions were clustered into two main groups. Special subgroups, reflecting place of origin, were observed within these groups. Ten selective primer pairs were found to be most informative because...
Tipo: Journal article
Palavras-chave: Amplified fragment length polymorphism; Brassica oleracea var. capitata; Cabbage; Discriminatory power; Genetic diversity.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300011

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

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

Influence of novel lignocellulosic residues in a biobed biopurification system on the degradation of pesticides applied in repeatedly high doses
Provedor de dados: 69
Autores: Diez,M. Cristina; Tortella,Gonzalo R; Briceño,Gabriela; Castillo,Maria del Pilar; Díaz,Jorge; Palma,Graciela; Altamirano,Carolina; Calderón,Carolina; Rubilar,Olga.
Background: The biobed is a simple biopurification system used to prevent the point-source pesticide contamination that occurs at farm level. The typical composition of the biomixture used in this system is soil, peat and straw in volumetric proportions of 1:1:2. The principal component is straw due to its positive effects on biological activity and thus pesticide degradation. However, access to straw can be limited in some regions, so it must be replaced by other more readily available lignocellulosic residues. Results: Therefore, two alternate lignocellulosic materials (barley husks and pine sawdust) were evaluated as partial substitutes for straw. The degradation of a repeatedly applied mixture of six pesticides by these alternates was assessed. The...
Tipo: Journal article
Palavras-chave: Biopurification system; Biomixture; Lignocellulosic materials; Pesticide degradation.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600011

Feasible biotechnological and bioremediation strategies for serpentine soils and mine spoils
Provedor de dados: 69
Reclamation of metalliferous areas is a priority field of biogeochemistry of trace elements. Ultramafic outcrops rich in heavy metals have been mapped in different parts of the world. Heavy metals are potentially cytotoxic, caricinogenic and mutagenic. Environment protection agencies and legislations insisting the mine operators to restore the mine spoils and tailings since the metal leachates have serious implications in production of healthy agricultural products. Hence, restoration of mine spoils, tailings and metalliferous soils is a challenging task for the well being of Humans. Synthetic and natural zeolites have been used as chelators for rapid mobility and uptake of metals from contaminated soils by plants. Use of synthetic chelators significantly...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000100003

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

The applicability of the API 20E and API Rapid NFT systems for the identification of bacteria from activated sludge
Provedor de dados: 69
Autores: Juang,Der-Fong; Morgan,Joe M.
The purpose of this study was to test the applicability of the API 20E and API Rapid NFT systems for the identification of some predominant gram-negative and gram-positive bacteria isolated from lab-scale activated sludge treatment systems. In this study, one lab-scale sequencing batch reactor (SBR) and one lab-scale continuous-flow stirred tank reactor (CFSTR) were setup. After both reactors had reached equilibrium, many pure cultures isolated from the activated sludge in both systems were obtained and many morphological, biochemical, physiological tests were conducted to identify each pure culture. The API 20E system is a standardized, miniaturized version of conventional procedures for rapid identification of Enterobacteriaceae and other gram-negative...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000100002

Studies on the effect of pH on the sorption of Pb2+ and Cd2+ ions from aqueous solutions by Caladium bicolor (Wild Cocoyam) biomass
Provedor de dados: 69
Autores: Horsfall Jnr,Michael; Spiff,Ayebaemi I.
Environmental protection requires the use of natural products instead of chemicals to minimize pollution. This investigation studies the use of a non-useful plant material as naturally occurring biosorbents for the removal of cationic pollutants in wastewater. The effect of pH on the sorption of Pb2+ and Cd2+ ion onto Caladium bicolor corm biomass was investigated. The experimental results have been analysed in terms of Langmuir, Freundlich and Flory-Huggins isotherms. The data showed that the maximum pH (pHmax) for efficient sorption of Pb2+ was 7.0 and for Cd2+ 5.0. Evaluation using Langmuir equation gave the monolayer sorption capacity as 88.50 mg/g and 65.50 mg/g at the respective pHmax for Pb2+ and Cd2+. Surface characterization of acid and base...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300014

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

Establishment of an in vitro micropropagation protocol for Mecardonia tenella
Provedor de dados: 69
Autores: Alderete,Liliana Marisol; Mori,Marcela; Kato,Adriana; Salvio Escandón,Alejandro.
Mecardonia tenella is an attractive herbaceous native plant, characterized by their intense green foliage and their abundant yellow flowers. It is a very interesting plant for pot and/or garden. A trait to improve in this species is the size of the flowers. The goal of the present paper is to study the in vitro behaviour of M. tenella and to establish a routine protocol for its micropropagation. For the in vitro establishment of M. tenella, nodal segments were disinfected by standard methods using ethanol/sodium hypochloride and cultured on hormone-free MS medium, supplemented with a mixture of antibiotics and an antifungal. In order to study the hormonal requirements of the species, nodal segments were cultured on basal MS supplemented with...
Tipo: Journal article
Palavras-chave: In vitro; Micropropagation; Scrophulariaceae.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300017

Enhance 1,3-propanediol production from crude glycerol in batch and fed-batch fermentation with two-phase pH-controlled strategy
Provedor de dados: 69
Autores: Sattayasamitsathit,Supalak; Methacanon,Pawadee; Prasertsan,Poonsuk.
The batch fermentation of 1,3-propanediol (1,3-PD) by Klebsiella pneumoniae SU6 at different crude glycerol concentration (40-100 g l-1), pH (6.5-7.5) and temperature (31-40ºC) combined with two-phase pH-controlled strategy was investigated. Effect of feeding rate (0.10-0.15 L h-1) was studied in fed-batch fermentation. In batch fermentation, the optimal condition was 60 g l-1 crude glycerol, pH control at 6.5 and cultivation temperature at 37ºC. The maximum 1,3-PD of 20 g l-1, the yield of 0.34 g 1,3-PD g-1 glycerol consumed and the productivity of 1.25 g l-1 h-1 were achieved at 16 hrs cultivation. The by-products were acetic acid and succinic acid at 2.7 and 1.1 g l-1, respectively. Two-phase pH-controlled strategy gave better results (24.95 g l-1...
Tipo: Journal article
Palavras-chave: 1; 3-propanediol crude glycerol fed-batch fermentation Klebsiella pneumonia two-phase pH-control.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600004

Novel antimicrobial secondary metabolites from a Penicillium sp. isolated from Brazilian cerrado soil
Provedor de dados: 69
Autores: Petit,Philippe; Lucas,Esther M. F.; Abreu,Lucas M; Pfenning,Ludwig H; Takahashi,Jacqueline A.
The morphological features of a Penicillium, isolated from Brazilian cerrado soil, were characterized and showed to be distinctly different from all well-defined Penicillium species. Chemical and biological investigation on the ethyl acetate extract of this Penicillium isolate resulted in the isolation of three new naphthalenoids: a major metabolite, methyl 6-acetyl-4-methoxy-5,7,8-trihydroxynaphthalene-2-carboxylate and two minor ones, methyl 6-acetyl-4-methoxy-7,8-dihydroxynaphthalene-2-carboxylate and methyl 6-acetyl-4-methoxy-5,8-dihydroxynaphthalene-2-carboxylate. Their structures were determined based on their mono and bidimensional nuclear magnetic resonance data. Acetyl, allyl and methoxyl derivatives of the major metabolite were prepared in order...
Tipo: Journal article
Palavras-chave: Antibacterial activity; Cerrado; Naphthalenoids; Penicillium; Secondary metabolites.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400008

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

Methyl jasmonate induced overproduction of eleutherosides in somatic embryos of Eleutherococcus senticosus cultured in bioreactors
Provedor de dados: 69
Autores: Shohael,Abdullah Mohammad; Murthy,Hosakatte Niranjana; Hahn,Eun-Joo; Paek,Kee-Yoeup.
This study was concentrated on the production of eleutherosides and chlorogenic acid in embryogenic suspension cultures of Eleutherococcus senticosus by exposing them to different concentrations (50-400 µM) of methyl jasmonate (MJ) during the culture period. In the bioreactor cultures, eleutheroside content increased significantly by elicitation of MJ, however, the fresh weight, dry weight and growth ratio of embryos was strongly inhibited by increasing MJ concentrations. The highest total eleutheroside (7.3 fold increment) and chlorogenic acid (3.9 fold increment) yield was obtained with 200 µM MJ treatment. There was 1.4, 3.4 and 14.9 fold increase in the eleutheroside B, E, and E1 production respectively with such elicitation treatment. These results...
Tipo: Journal article
Palavras-chave: Eleutherosides; Elicitation; Methyl jasmonate; Secondary metabolite; Siberian ginseng; Suspension culture.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400016

Extent and structure of genetic diversity in a collection of the tropical multipurpose shrub legume Cratylia argentea (Desv.) O. Kuntze as revealed by RAPD markers
Provedor de dados: 69
Autores: Andersson,Meike S; Schultze-Kraft,Rainer; Peters,Michael; Duque,Myriam C; Gallego,Gerardo.
The tropical multipurpose shrub legume Cratylia argentea is well adapted to acid soils of low to medium fertility and has excellent drought-tolerance. Due to its high nutritive value it is particularly suited as forage for dry-season supplementation. A collection of 47 C. argentea accessions in a collection, derived from seed replicating of original accessions with differing geographic origin and morphological and agronomic characteristics was investigated using molecular markers (RAPD (random amplified polymorphic DNA)). Genetic diversity (H T = 0.145) in the collection was low, with 30% of differentiation among groups and high genetic similarity among accessions (GS = 0.805). Within-accession variability was high. One taxonomic mismatch and five possible...
Tipo: Journal article
Palavras-chave: Agroforestry; Molecular markers; MPT (multipurpose shrubs and trees); Tropics.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300006

Modelling of the biofiltration of reduced sulphur compounds through biotrickling filters connected in series: Effect of H2S
Provedor de dados: 69
Autores: Silva,Javier; Morales,Marjorie; Cáceres,Manuel; Morales,Paulina; Aroca,Germán.
Background: The behaviour of two biotrickling filters connected in serie (BTF) inoculated with Acidithiobacillus thiooxidans and Thiobacillus thioparus, biodegrading hydrogen sulphide (H2S) and dimethyl sulphide (DMS) simultaneously were studied. A model which considers gas to liquid mass transfer and biooxidation in the biofilm attached to the support is developed. Additionally, a fixed bed biotrickling filter where the microorganism is immobilized in a biofilm which degrades a mixture of H2S and DMS is implemented. Validation of the model was carried out using experimental data obtained at different H2S and DMS loads. Results: The inhibitory effect caused by the presence of H2S on the DMS is observed, which is evidenced by the decrease of the DMS removal...
Tipo: Journal article
Palavras-chave: Biofiltration; DMS; Hydrogen sulphide; Mathematical model; Thiobacillus thioparus.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300007

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

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

Global health care challenge: Indian experiences and new prescriptions
Provedor de dados: 69
Autores: Wakdikar,Sandhya.
Globally, there has been an unparalleled growth in the plant-derived medicinally useful formulations, drugs and health-care products, its market covering more than 60% products derived from plant origin. India exhibits remarkable outlook in modern medicines that are based on natural products besides traditional system of Indian medicines. Almost, 70% modern medicines in India are derived from natural products. Medicinal plants play a central role not only as traditional medicines but also as trade commodities, meeting the demand of distant markets. Ironically, India has a very small share (1.6%) of this ever-growing global market. To compete with the growing market, there is urgency to expeditiously utilize and scientifically validate more medicinally...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300002

Removal of heavy metal from industrial wastewater using chitosan coated oil palm shell charcoal
Provedor de dados: 69
Autores: Saifuddin M,Nomanbhay; Kumaran,Palanisamy.
This research focuses on understanding biosorption process and developing a cost effective technology for treatment of heavy metals-contaminated industrial wastewater. A new composite biosorbent has been prepared by coating chitosan onto acid treated oil palm shell charcoal (AOPSC). Chitosan loading on the AOPSC support is about 21% by weight. The shape of the adsorbent is nearly spherical with particle diameter ranging 100~150 &amp;micro;m. The adsorption capacity of the composite biosorbent was evaluated by measuring the extent of adsorption of chromium metal ions from water under equilibrium conditions at 25&amp;ordm;C. Using Langmuir isotherm model, the equilibrium data yielded the following ultimate capacity values for the coated biosorbent on a per...
Tipo: Journal article
Palavras-chave: Chitosan bioabsorbent; Chromium (III); Chromium (IV); Heavy metal adsorption; Oil palm shell charcoal.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100008

Effect of vermicompost, worm-bed leachate and arbuscular mycorrizal fungi on lemongrass (Cymbopogon citratus (DC) Stapf.) growth and composition of its essential oil
Provedor de dados: 69
Autores: León-Anzueto,Elizabeth; Abud-Archila,Miguel; Dendooven,Luc; Ventura-Canseco,Lucía María Cristina; Gutiérrez-Miceli,Federico A.
The objective of this study was to investigate the effect of vermicompost, worm-bed leachate (WBL) and Glomus mosseae, an arbuscular mycorrhizal fungi (AMF), on growth of lemongrass (Cymbopogon citratus (DC.) Stapf). A response surface methodology, i.e. a three-level Box Benhen design with three repetitions and three blocks, was applied to optimize biomass production, essential oil yield and its composition. Application rates of Glomus mosseae were 0, 1 or 2 g plant-1, vermicompost 0, 5 or 10 g plant-1 and WBL 0, 10 and 20%. The AMF had no significant effect on the variables tested, but vermicompost had a significant effect on essential oil yield and WBL on essential oil yield, myercene concentration and shoot dry weigh (p &lt; 0.05). It was found that...
Tipo: Journal article
Palavras-chave: Citral; Desirability function; Lemongrass; Myrcene; Optimization; Response surface methodology.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600005

Effects of elicitor and copper sulfate on grindelic acid production in submerged cultures of Grindelia pulchella
Provedor de dados: 69
Autores: Hernandez,Xenia E; Orden,Alejandro A; Giordano,Oscar S; Kurina,Marcela.
Grindelia pulchella callus and cell suspension cultures were established from seedling leaves. When several phytoregulator supplementations were assayed in solid Murashige and Skoog medium containing 3% (w/v) of sucrose (MS medium), combinations of indole-3-butyric acid (IBA) and N6-benzylaminopurine (BA) resulted the most appropriate conditions to generate fast growing friable calli with detectable levels of grindelic acid. Moreover, the same basal media supplemented with 20.0 µM IBA/4.4 µM BA was found to be optimal for cell growth in submerged cultures (µmax = 0.26 days-1) while the addition of 20.0 µM IBA/18.0 µM BA resulted in a relative higher metabolite production (4.55 mg/gDW) when the inocula was 5% (v/v). Furthermore, three different stress...
Tipo: Journal article
Palavras-chave: Cu2+; Dimethylsulfoxide permeabilization; Grindelane diterpenes; Jasmonic acid.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300007

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

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

Optimization of b-galactosidase production using Kluyveromyces lactis NRRL Y-8279 by response surface methodology
Provedor de dados: 69
Autores: Dagbagli,Seval; Goksungur,Yekta.
This paper investigates the production and optimization of b-galactosidase enzyme using synthetic medium by Kluyveromyces lactis NRRL Y-8279 in shake flask cultures. Among the different cell disintegration methods used, the highest specific activity was obtained when the cells were permeabilized using isoamyl alcohol. Response surface methodology was used to investigate the effects of four fermentation parameters (agitation speed, pH, initial substrate concentration and incubation time) on b-galactosidase enzyme production. Results of the statistical analysis showed that the fit of the model was good in all cases. Maximum specific enzyme activity of 4218.4 U g-1 was obtained at the optimum levels of process variables (pH 7.35, agitation speed 179.2 rpm,...
Tipo: Journal article
Palavras-chave: B-galactosidase; Kluyveromyces lactis; Response surface methodology; Shake flask culture; Synthetic medium.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400011

Nutrient optimization for production of polyhydroxybutyrate from halotolerant photosynthetic bacteria cultivated under aerobic-dark condition
Provedor de dados: 69
Autores: Sangkharak,Kanokphorn; Prasertsan,Poonsuk.
Three halotolerant bacterial strains; Rhodobacter sphaeroides ES16 (the wild type) and the two mutant strains of R. sphaeroides ES16, namely N20 and U7, were cultivated in glutamate-malate (GM) medium and screened for production of polyhydroxybutyrate (PHB). The mutant strains N20 and U7 were found to accumulate PHB (53.9 and 42.0% of DCW, respectively) 3.6 and 2.8 times higher than the wild type strain (19.5% of DCW), respectively. R. sphaeroides N20 were selected for studies on the effects of nutrient and environmental conditions on PHB accumulation. The optimal condition was 4 g/l acetate, 0.02 g/l (NH4)2SO4, C/N ratio of 6:1, 1.0 g/l K2HPO4, 1.0 g/l KH2PO4 and 3% NaCl with initial pH at 7.0. Under this optimal condition, the maximum PHB accumulation...
Tipo: Journal article
Palavras-chave: Aerobic-dark cultivation; Optimization; PHB; Polyhydroxybutyrate; Rhodobacter sphaeroides.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300009

Efficient Agrobacterium tumefaciens-mediated transformation of Malus zumi (Matsumura) Rehd using leaf explant regeneration system
Provedor de dados: 69
Autores: Xu,Jin; Wang,Yu Zhen; Xia Yin,Heng; Jing Liu,Xiao.
Malus zumi is known as an excellent dwarfing apple rootstock occurring in natural or arid/semiarid soil or salina. Gene manipulation of M. zumi through transgenic technology can modify plant feature for further improvement fruit tree production by grafting the scion on a transgenic rootstock. Here, we report the establishment of an efficient, in vitro, shoot regeneration system and Agrobacterium tumefaciens- mediated transformation from the leaf explants for Malus zumi (Matsumura) Rehd. Leaf explants were infected with Agrobacterium strains containing nptII and gus gene. The highest frequency of shoot regeneration was obtained on MS medium containing 500 mg l-1 Lactalbumin hydrolysate, 30 g l-1 fructose, supplemented with 3.0 mg l-1 BA, 0.2 mg l-1...
Tipo: Journal article
Palavras-chave: Agrobacterium tumefaciens; Apple rootstock; Genetic transformation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000100003

Isolation of purple nonsulfur bacteria for the removal of heavy metals and sodium from contaminated shrimp ponds
Provedor de dados: 69
Autores: Panwichian,Saijai; Kantachote,Duangporn; Wittayaweerasak,Banjong; Mallavarapu,Megharaj.
In order to determine whether waters used for the shrimp cultivation contained toxic levels of heavy metals (HMs) and sodium (Na), analysis was carried out on 31 shrimp ponds in areas of southern Thailand. Purple nonsulfur bacteria (PNB) were also isolated from the same ponds to investigate if they could be used for bioremediation of the above contaminants. The highest HMs concentrations of the sediment samples in mg/kg dry weight were found as follows: 0.75 cadmium (Cd), 62.63 lead (Pb), 34.60 copper (Cu) and 58.50 zinc (Zn). However, all sediment samples met Hong Kong standards for dredged sediment. In contrast, contamination of Cu (9-30 µg/L) and Zn (140-530 µg/L) exceeding the standard guidelines for marine aquatic animal set by the Pollution Control...
Tipo: Journal article
Palavras-chave: Bioremediation; Heavy metals; Purple nonsulfur bacteria; Salinity; Shrimp farming.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400003

Molecular cloning and expression analysis of the MaASR1 gene in banana and functional characterization under salt stress
Provedor de dados: 69
Autores: Miao,Hongxia; Wang,Yuan; Liu,Juhua; Jia,Caihong; Hu,Wei; Sun,Peiguang; Jin,Zhiqiang; Xu,Biyu.
Background Abscisic acid (ABA)-, stress- and ripening-induced protein (ASR) is plant-specific hydrophilic transcriptional regulators involved in sucrose stress and wounding in banana. However, it is not known whether banana ASR genes confer salt stress tolerance. The contexts of the study was to analysis the sequence characterization of banana ASR1, and identify its expression patterns and function under salt stress using quantitative real-time PCR (qPCR) and overexpression in Arabidopsis. The purpose was to evaluate the role of banana ASR1 to salt stress tolerance employed by plants. Results A full-length cDNA isolated from banana fruit was named MaASR1, and it had a 432 bp open reading frame (ORF) encoding 143 amino acids. MaASR1 was preferential...
Tipo: Journal article
Palavras-chave: ASR; Banana; Expression patterns; Salt resistance.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600006

Isolation of adh mutant of Lactobacillus rhamnosus for production of L(+) Lactic acid
Provedor de dados: 69
Autores: Narayanan,Niju; Roychoudhury,Pradip K.; Srivastava,Aradhana.
Lactobacillus rhamnosus, a facultative anaerobe, which produces L (+) lactic acid and ethanol under anaerobic conditions, is used in the present study. An adh- mutant of Lactobacillus rhamnosus MTCC 1408, was developed by chemical mutagenesis, which could produce pure L(+) lactic acid as the only product. Batch fermentation kinetics of the wild type and the mutant strain were studied in glucose-yeast extract medium under conditions of temperature 40ºC and pH 6.2 anaerobically. The biomass yield was similar in both wild type and mutant strains, however lactic acid yield increased by 6.6%. A chemically defined media was optimized for supplementation of succinate, acetate and citrate for better biomass formation using single variable optimisation. It was...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100010

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

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

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

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

Plant virus gene expression strategies
Provedor de dados: 69
Autores: Bustamante,Pedro I.; Hull,Roger.
Plant viruses can cause serious losses to most, if not all, major crops upon which depend for food. Many viruses are endemic, causing moderate losses each year. Others, such as those causing rice tungro, give periodic severe epidemics. There are no fully collated figures for world-wide losses due to viruses but some examples has been listed, i.e., rice tungro in SE ASIA and african cassava mosaic in Africa with 1,500 and 2,000 millions dollars per year in losses respectively. However, in recent years the understanding of the genome organisation of plant viruses has increased in parallel with development of molecular biological techniques. The ability to obtain nucleotide sequences of complete viral genomes has also permitted the elucidation and...
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000200003

Identification and expression analysis of two Wnt4 genes in the spotted scat (Scatophagus argus)
Provedor de dados: 69
Autores: Chen,Jianhua; Yinglei,Li; Zhang,Junbin; Liu,Huifen; Li,Yongqi.
Background: WNT4 is a protein that plays a crucial role in ovarian differentiation and development in mammals, with a relatively well understood function in mammalian gonadal differentiation. The role of WNT4 in teleost fish; however, remains unclear. In the present study, cDNAs of Wnt4a and Wnt4b were cloned and characterized in the spotted scat. The expression patterns of two Wnt4 genes in the gonads at different stages of development and in fish after treatment with 17a-methyltestosterone (MT) were investigated. Results: The tissue distribution showed that Wnt4a was expressed in various tissues, including the gonads, gills, spleen, brain, and fin. Interestingly, Wnt4b not only was expressed in the gills, brain, and spleen, but also was obviously...
Tipo: Journal article
Palavras-chave: Androgen; Expression patterns; Scatophagus argus; Tissue expression; Wnt4.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000200004

Problem solving in enzyme biocatalysis
Provedor de dados: 69
Autores: Acevedo,Fernando.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000400001

Effect of different metals on protease activity in sunflower cotyledons
Provedor de dados: 69
Autores: Pena,Liliana B.; Tomaro,María L.; Gallego,Susana M.
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300016

Evaluation of genetic diversity and linkage disequilibrium in Korean-bred rice varieties using SSR markers
Provedor de dados: 69
Autores: Wang,Xiao-Qiang; Kwon,Soon-Wook; Park,Yong-Jin.
Background: In order to evaluate the variation among different rice types, the genetic diversity in a rice collection composed by 59 breeding lines, 23 landraces, 18 weedy rice lines, and 35 introduced lines that collected from countries worldwide was analyzed using 134 simple sequence repeat markers. Results: In total, 1264 alleles were identified (average, 9.43 per locus). Rare alleles made up a large portion (58.4%) of the detected alleles, and 29 unique alleles associated with rice accessions were also discovered. A model-based structural analysis revealed the presence of three subpopulations. The genetic relationships revealed by the neighbour-joining tree method were fairly consistent with the structure-based membership assignments for most of the...
Tipo: Journal article
Palavras-chave: Landraces; Linkage disequilibrium; Population structure; Rice; Simple sequence repeats.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500011

Globalisation, a new paradigm
Provedor de dados: 69
Autores: Acevedo,Fernando.
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100001

Pleiotropic effects of the sdw1 locus in barley populations representing different rounds of recombination
Provedor de dados: 69
Autores: Kuczy&amp;#324;ska,Anetta; Miko&amp;#322;ajczak,Krzysztof; &amp;#262;wiek,Hanna.
Background In the present study populations, representing different rounds of recombination were used for the analysis of phenotypic effects associated with the sdw1/denso locus. Other studies have mostly focused only on one type of population. Many different QTLs mapped at the same position as the sdw1/denso locus may indicate a pleiotropy of this gene or a tight linkage between genes conditioning quantitative traits. To date, results of studies have not unequivocally proven either of these two phenomena. Results Both breeding and molecular mapping experiments were undertaken to examine 200 single seed descent (SSD) and 60 doubled haploid (DH) lines obtained from the Maresi (with a semi-dwarfing gene) and Pomo cross combination. They were evaluated for...
Tipo: Journal article
Palavras-chave: DH; Hordeum vulgare L; Quantitative traits; Semi-dwarfing gene; SSD; SSR markers.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500005

Genetic diversity among native varieties and commercial cultivars of Solanum tuberosum ssp. tuberosum L. present in Chile
Provedor de dados: 69
Autores: Solano,Jaime; Mathias,Monica; Esnault,Florence; Brabant,Philippe.
Background: The object of this work was to determine the genetic and allelic diversity of Solanum species present in Chile, assessing allelic distribution among native varieties and commercial cultivars of Solanum tuberosum ssp. tuberosum L., using microsatellite markers. Results: A high level of allelic richness was found in the potatoes studied. The seven microsatellite markers used presented a total of 64 allelic variants among native varieties and commercial cultivars of Solanum tuberosum ssp. tuberosum. The SSR loci generated an average of 9.16 alleles/locus. The group with the highest PIC was that of native varieties collected in the Chiloe archipelago. The high PIC values found indicate that the native varieties from Chiloe have a low level of...
Tipo: Journal article
Palavras-chave: Dendrogram; Germplasm; SSR markers.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600008

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

Production of extracellular alkaline protease by new halotolerant alkaliphilic Bacillus sp. NPST-AK15 isolated from hyper saline soda lakes
Provedor de dados: 69
Autores: Ibrahim,Abdelnasser S.S; Al-Salamah,Ali A; Elbadawi,Yahya B; El-Tayeb,Mohamed A; Ibrahim,Shebl Salah Shebl.
Background Alkaline proteases are among the most important classes of industrial hydrolytic enzymes. The industrial demand for alkaline proteases with favorable properties continues to enhance the search for new enzymes. The present study focused on isolation of new alkaline producing alkaliphilic bacteria from hyper saline soda lakes and optimization of the enzyme production. Results A new potent alkaline protease producing halotolerant alkaliphilic isolate NPST-AK15 was isolated from hyper saline soda lakes, which affiliated to Bacillus sp. based on 16S rRNA gene analysis. Organic nitrogen supported enzyme production showing maximum yield using yeast extract, and as a carbon source, fructose gave maximum protease production. NPST-AK15 can grow over a...
Tipo: Journal article
Palavras-chave: Alkaline protease; Alkalophiles; Bacillus sp; Fermentation; Optimization.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300015

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

Effects of substrates and reaction conditions on production of cyclodextrins using cyclodextrin glucanotransferase from newly isolated Bacillus agaradhaerens KSU-A11
Provedor de dados: 69
Autores: Ibrahim,Abdelnasser S.S; El-Tayeb,Mohamed A; Elbadawi,Yahya B; Al-Salamah,Ali A.
The effects of reaction conditions on cyclodextrins (CDs) production by CGTase from newly isolated Bacillus agaradhaerens KSU-A11 is reported. Among six types of starch tested, potato starch gave highest starch conversion into CDs. In addition, CDs yield was about three fold higher when using gelatinized potato starch in comparison to raw starch. The total CDs production was increased with increasing pH, showing maximum starch conversion at pH 10. Furthermore, the proportion of &amp;#947;-CD was relatively higher under slightly acidic-neutral conditions than at alkaline pH with a maximum proportion of 35.6% at pH 7 compared to 7.6% at pH 10. Maximum starch conversion into CDs was seen at reaction temperature of 55ºC. Lower reaction temperature led to...
Tipo: Journal article
Palavras-chave: Bacillus agaradhaerens; Cyclodextrin glucanotransferase; Cyclodextrinc; Enzymatic reaction; Starch.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500004

Somatic embryogenesis and plant regeneration capacity in Argentinean maize (Zea mays L.) inbred lines
Provedor de dados: 69
Autores: González,Germán Andrés; Pacheco,María Gabriela; Oneto,Cecilia Décima; Etchart,Valeria J; Kandus,Mariana V; Salerno,Juan Carlos; Eyherabide,Guillermo; Presello,Daniel; Lewi,Dalia Marcela.
Somatic embryogenesis, which is still the method of choice for tissue culture, regeneration and transformation of maize, is largely considered highly genotype-dependent. The Hi II, a highly embryogenic genotype, has been extensively used in transformation protocols. However, this is not an inbred line; instead, it has a proportion of the undesirable A-188 background, and the progeny segregates for phenotypic characteristics and shows poor agronomic performance. In an effort to identify genotypes that combine a high somatic embryogenic response and good agronomic performance, we evaluated 48 advanced inbred lines developed at INTA. Callus development and somatic embryogenesis capacity were measured in 200 immature embryos per line. Embryogenic capacity [EC...
Tipo: Journal article
Palavras-chave: Callus; Inbred lines; Maize; Molecular markers; Regeneration; Somatic embryogenesis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100009

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

Experimental and bioinformatic approaches for analyzing and visualizing cyanobacterial nitrogen and hydrogen metabolism
Provedor de dados: 69
Autores: Wünschiers,Röbbe; Axelsson,Rikard; Vellguth,Martin; Lindblad,Peter.
Many cyanobacteria are capable of utilizing light energy for nitrogen fixation. As a by-product of this nitrogenase mediated catalysis, hydrogen gas is produced. Several approaches to increase hydrogen production from cyanobacteria exist. Usually, these approaches are non-targeted. Here we exemplify how DNA-microarray based gene-expression analysis and bioinformatic visualization techniques can be used to analyze nitrogen and hydrogen metabolism from the filamentous, heterocyst forming cyanobacterium Nostoc PCC 7120. We analyzed the expression of 1249 genes from major metabolic categories under nitrogen fixing and non-nitrogen fixing growth. Of the selected genes, 494 show a more than 2-fold expression difference in the two conditions analyzed. Under...
Tipo: Journal article
Palavras-chave: Bioinformatics; Cyanobacteria; DNA-microarrays; Gene expression; Metabolic pathways; Nitrogen availability; Nitrogen fixation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400008

Genetic and metabolic engineering
Provedor de dados: 69
Autores: Yang,Yea-Tyng; Bennett,George N; San,Ka-Yiu.
Recent advances in molecular biology techniques, analytical methods and mathematical tools have led to a growing interest in using metabolic engineering to redirect metabolic fluxes for industrial and medical purposes. Metabolic engineering is referred to as the directed improvement of cellular properties through the modification of specific biochemical reactions or the introduction of new ones, with the use of recombinant DNA technology (&lt;A HREF="#56"&gt;Stephanopoulos, 1999&lt;/A&gt;). This multidisciplinary field draws principles from chemical engineering, biochemistry, molecular and cell biology, and computational sciences. The aim of this article is to give an overview of the various strategies and tools available for metabolic engineers and to...
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000300003

Use of molecular markers and major genes in the genetic improvement of livestock
Provedor de dados: 69
Autores: Montaldo,Hugo H.; Meza-Herrera,Cesar A.
Recent developments in molecular biology and statistics have opened the possibility of identifying and using genomic variation and major genes for the genetic improvement of livestock. Information concerning the basis of these techniques and their applications to the genetic improvement of animals is reviewed. Main marker molecular marker systems in animals (RFPL and microsatellites), genome maps, methods for detecting marker major gene linkages and use of marker assisted selection, genetic fingerprinting and mixture models based on segregation analysis are analyzed. The characteristics where the application of marker assisted selection can be more effective are those that are expressed late in the life of the animal, or controlled by a few pairs of genes....
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000200004

In vitro regeneration and genetic fidelity of Tigridia pavonia (L.f.) DC.
Provedor de dados: 69
Autores: Piña-Escutia,José Luis; Vázquez-García,Luis Miguel; Arzate-Fernández,Amaury Martín.
Plants of Tigridia pavonia (L.f.) DC were regenerated from twin-scaling explants cultured on Murashige and Skoog and N6 basal medium. The highest formation of shoots per responding explant was obtained on N6 medium supplemented with 4.5 µM 2,4-dichlorophenoxy acetic acid in combination with 2.2 µM benzylaminopurine. Shoots rooted readily on N6 basal medium supplemented with 1 g l-1 activated charcoal and 2.6 µM naphtalenacetic acid. The rooted shoots achieved 100% survival. Inter Simple Sequence Repeat analysis was carried out to check for possible genetic alterations in plants obtained after two consecutive subcultures. The results revealed that the recovered plants did not exhibit any type of polymorphism.
Tipo: Journal article
Palavras-chave: Genetic integrity; Micropropagation; Oceloxóchitl.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100007

Expression and non-chromatographic purification of 1,3-propanediol oxidoreductase in Escherichia coli
Provedor de dados: 69
Autores: Li,Wei; Ng,I-Son; Fang,Baishan; Zhang,Guangya.
The gene dhaT from Klebsiella pneumoniae encodes 1,3-propanediol oxidoreductase (PDOR). Thermally responsive elastin-like polypeptides (ELPs) was used as a fusion tag to purify the proteins (PDOR). The ELP gene was attached to dhaT and ligated into the pET-22b vector. Different NaCl concentrations were employed to decrease the transition temperature (Tt) which was diminished as salt concentration increased. The optimal final concentration of NaCl was 1 M and the corresponding Tt was 39.5ºC. Enzymatic assays were determined via every step for purification of fusion PDOR. PDOR showed good stability during the purification process, the specific activity in the first and second round of inverse transition cycling (ITC) was 276.1 ± 13.3 and 213.3 ± 10.8 U/mg,...
Tipo: Journal article
Palavras-chave: 1; 3-propanediol oxidoreductase elastin-like polypeptides Escherichia coli fusion protein non-chromatographic purification.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600010

Potential of giant reed (Arundo donax L.) for second generation ethanol production
Provedor de dados: 69
Autores: Lemons e Silva,Claudia Fernanda; Artigas Schirmer,Manoel; Nobuyuki Maeda,Roberto; Araújo Barcelos,Carolina; Pereira,Nei.
Background The production of second generation ethanol from lignocellulosic biomasses that have not had their potential fully explored as feedstock is of great importance. Arundo donax is one these biomasses. It is a promising grassy plant to be used as a renewable resource for the production of fuels and chemicals, because of its fast growth rate, ability to grow in different soil types and climatic conditions. The present study evaluated its use as feedstock for the production of second generation ethanol. Results Initially its chemical characterization was carried out, and a protocol for fractioning the biomass through diluted acid pretreatment followed by alkaline pretreatment was developed, providing a solid fraction which was undergone to enzymatic...
Tipo: Journal article
Palavras-chave: Acid and alkaline pretreatments; Alcohol fermentation; Cellulase; Enzymatic hydrolysis; Lignocellulose.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100003

New molecular biologist perspective and insight: DNA topoisomerases production by recombinant DNA technology for medical laboratory application and pharmaceutical industry
Provedor de dados: 69
Autores: Chan,Mooi Kwai; Fadzil,Nur Adila; Chew,Ai Lan; Khoo,Boon Yin.
DNA topoisomerases are essential enzymes that control the topological state of DNA replication during mitosis. These enzymes are classified based on their mechanisms and physical properties. During mitosis, superhelical DNA must be unwound or relaxed by DNA topoisomerases prior to a decoding step by DNA processing enzymes, such as DNA polymerase and RNA polymerase. By blocking the reaction of resealing the breaks in the DNA ultimately can result in cellular death. Compounds that inhibit the catalytic function of these enzymes can serve as potential anticancer agents. DNA topoisomerases are found in nature and used as high quality and well-validated targets for the screening of potential anticancer agents. Our current work focuses on determining potential...
Tipo: Journal article
Palavras-chave: DNA topoisomerase; Medical laboratory application; Pharmaceutical industry; Recombinant DNA technology.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600018

Identification of SSR markers using soybean (Glycine max) ESTs from globular stage embryos
Provedor de dados: 69
Autores: Li,Ai Qin; Zhao,Chuan Zhi; Wang,Xing Jun; Liu,Zhan Ji; Zhang,Li Feng; Song,Guo Qi; Yin,Juan; Li,Chang Sheng; Xia,Han; Bi,Yu Ping.
Microsatellites, or simple sequence repeats (SSRs), in expressed sequence tags (ESTs) provide an opportunity for low cost SSR development. We looked for EST-SSRs in 403,511 ESTs (generated by 454 sequencing and representing 70,654 contigs and 52,082 singletons) from soybean globular stage embryos. Among 122,736 unique ESTs, 3,729 contained one or more SSRs. In total, 3,989 SSRs were identified including 304 mono, 1,374 di, 2,208 tri, 70 tetra, 13 penta and 20 hexanucleotide SSRs. Thirty three EST-SSRs were selected for primer design and polymorphism analysis using twenty soybean cultivars and one wild-type soybean. Successful amplification was obtained using 21 of these primer pairs, 11 of which detected polymorphisms in these soybean cultivars. These...
Tipo: Journal article
Palavras-chave: 454 sequencing; EST; Glycine max; Polymorphism; SSR.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500006

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

Novel antiviral activity of dialdehyde starch
Provedor de dados: 69
Autores: Song,Le; Cruz,Caroline; Farrah,Samuel R; Baney,Ronald H.
A significant effort worldwide is being directed toward development of novel biocides against drug-resistant bacterial and viruses because of the significant potential human infection risks in the general population. We report here the discovery of a strong antiviral biocide, dialdheyde starch (DAS). Antiviral tests were carried out against three non-envelop viruses, including two bacterial viruses MS2 and PRD1, and one human virus Poliovirus. Dialdehyde starch aqueous suspensions were effective biocides against these three test viruses in a 1 hr exposure test. The antiviral activity was significantly enhanced in a four-hour exposure test, with maximum seven orders of magnitude reductions against MS2 and PRD1, and four-order reduction against Poliovirus....
Tipo: Journal article
Palavras-chave: Antiviral; Biocide; Dialdehyde starch; Virus.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200013

Metal hyperaccumulation in plants: Biodiversity prospecting for phytoremediation technology
Provedor de dados: 69
Autores: Vara Prasad,Majeti Narasimha; de Oliveira Freitas,Helena Maria.
The importance of biodiversity (below and above ground) is increasingly considered for the cleanup of the metal contaminated and polluted ecosystems. This subject is emerging as a cutting edge area of research gaining commercial significance in the contemporary field of environmental biotechnology. Several microbes, including mycorrhizal and non-mycorrhizal fungi, agricultural and vegetable crops, ornamentals, and wild metal hyperaccumulating plants are being tested both in lab and field conditions for decontaminating the metalliferous substrates in the environment. As on todate about 400 plants that hyperaccumulate metals are reported. The families dominating these members are Asteraceae, Brassicaceae, Caryophyllaceae, Cyperaceae, Cunouniaceae, Fabaceae,...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300012

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

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

Novel s-triazine-degrading bacteria isolated from agricultural soils of central Chile for herbicide bioremediation
Provedor de dados: 69
Autores: Hernández García,Marcela; Morgante,Verónica; Ávila Perez,Marcela; Villalobos Biaggini,Patricio; Miralles Noé,Pola; González Vergara,Myriam; Seeger Pfeiffer,Michael.
s-Triazine-degrading bacterial strains were isolated from long-term simazine-treated agricultural soils of central Chile. The number of culturable heterotrophic bacteria of these agricultural soils (7 x 10(6) CFU/g of dry soil) was not affected by simazine application on field. The simazine-degrading bacterial strains P51, P52 and C53 were isolated by enrichment in minimal medium using simazine as the sole nitrogen source. Resting cells of strains P51 and P52 degraded &gt;80% of simazine within 48 hrs, whereas strain C53 was able to remove &gt;60% of the herbicide. The atzA and atzD genes of the s-triazine upper and lower catabolic pathways were detected in strains P51 and C53, while only atzD gene was observed in strain P52. To compare the bacterial 16S...
Tipo: Journal article
Palavras-chave: Arthrobacter; Biodegradation; Bioremediation; Simazine; Stenotrophomonas; S-triazine.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500005

Nutrient enrichment of cassava peels using a mixed culture of Saccharomyces cerevisae and Lactobacillus spp solid media fermentation techniques
Provedor de dados: 69
Autores: Oboh,Ganiyu.
Cassava pulp was fermented with pure strains of Saccharomyces cerevisae and two bacteria namely Lactobacillus delbruckii and Lactobacillus coryneformis for 3 days. The squeezed liquid from the fermented pulp was used to ferment cassava peels for 7 days. Analysis of the dried fermented peels revealed that there was a significant (P &lt; 0.05) increase in the protein content of the cassava peels fermented with squeezed liquid from the inoculated cassava pulp (21.5%) when compared with the unfermented cassava peel (8.2%). Moreover, the treatment equally brought about a significant (P &lt; 0.05) decrease in the cyanide (6.2 mg/kg) and phytate content (789.7 mg/100g) when compared with the unfermented cassava peels, which had 44.6 mg/kg cyanide and 1043.6...
Tipo: Journal article
Palavras-chave: Cassava peels; Cyanide; Fermentatio; Protein.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100007

Sucrose hydrolysis catalyzed by auto-immobilized invertase into intact cells of Cladosporium cladosporioides
Provedor de dados: 69
Autores: Santana de Almeida,Ana Cláudia; Costa de Araújo,Luciares; Mendes Costa,Andressa; Moraes de Abreu,César Augusto; Gomes de Andrade Lima,Maria Alice; Perez Fernandez Palha,Maria de Los Angeles.
The enzyme known as invertase (E.C. 3.2.1.26 - &amp;#946;-D-fructofuranosidase) catalyzes the sucrose hydrolysis producing an equimolar mixture of glucose and fructose named inverted sugar. The fungus Cladosporium cladosporioides has invertase as its constituent. Hence, its use as a natural immobilized support for the invertase produces interesting results for the enzyme. The present work has the objective of determining the optimum operational conditions of auto-immobilized invertase, as well as its kinetic parameters (K M and Vmax). A complete 2³ factorial planning was done for the evaluation of such parameters. Temperature, pH and agitation level were the studied variables. The hydrolysis percentage was the monitored result. Batch tests in optimum...
Tipo: Journal article
Palavras-chave: Cladosporium cladosporioides; Factorial planning; Invertase.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100009

Lactic acid production by a strain of Lactococcus lactis subs lactis isolated from sugar cane plants
Provedor de dados: 69
Autores: Serna Cock,Liliana; Rodríguez de Stouvenel,Aida.
A Lactococcus lactis subs lactis strain was selected from 20 lactic acid strains isolated from the leaves of sugar cane plants, variety CC 85-92. The effects of substrate concentration and pH control on lactic acid (LA) production, glucose conversion (GC) and yield (Yp/s) were investigated using this strain. In batch fermentation at 32&amp;ordm;C, with 60 gl-1 of glucose and a pH of 6.0, concentrations of up to 35 gl-1 of lactic acid were obtained. Maximum production and glucose conversion was achieved at low glucose concentrations. The strain shows great potential for lactic acid production from glucose, even without using pH control during fermentation (13.7 gl-1)
Tipo: Journal article
Palavras-chave: CC 85-92; Leaves of sugar cane; PH control; Substrate concentration.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100006

Genotypic variation in morphology and freezing resistance of Eucalyptus globulus seedlings subjected to drought hardening in nursery
Provedor de dados: 69
Autores: Coopman,Rafael E; Jara,Jorge C; Escobar,Rene; Corcuera,Luis J; Bravo,Leon A.
Eucalyptus globulus Labill is one of the most planted species in Chile, because of its fast growth and superior pulp qualities. Nevertheless, the incidence of drought and frost damage immediately after planting is frequent. The purpose of this work was to study the effect of drought hardening on frost resistance and on variations in morphological traits that may increase drought resistance at nursery phase in four genotypes of E. globulus Labill. Drought hardening treatments consisted in induced water stress by watering restriction, until pre-dawn stem xylem water potentials (&amp;#936;pd) reached -0.2, -1.8 and -2.6 MPa. Two water stress-rewatering cycles were applied during 54 days of hardening. Plant and root biomasses were affected by the interaction...
Tipo: Journal article
Palavras-chave: Biomass allocation; Cross hardening; Genotypic selection; Planting stock quality; Water stress.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100005

Globalisation and Learning
Provedor de dados: 69
Autores: Sánchez Sorondo,Marcelo.
Tipo: Journal article
Palavras-chave: Globalisation; Education; Justice; Ethics; Synthesize knowledge.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100003

Sequence variability in p27 gene of Citrus Tristeza Virus (CTV) revealed by SSCP analysis
Provedor de dados: 69
Citrus tristeza closterovirus (CTV), is a phloem-limited virus transmitted by aphids in a semipersistent manner. The genome of CTV is composed of a ssRNA with two capsid proteins: CP, covering about 95% of the particle length, and a diverged coat protein (dCP), present only in one end of the particle, forming a rattlesnake structure. dCP is the product of p27 gene for which it is also postulated a function in the transmissibility by aphid vectors. Hybridization analysis showed a p27 gene region, which exhibits different patterns with two probes derived from two biological distinct CTV isolates. In an attempt to screen whether that gene region differs in mild and severe strains, six CTV isolates belonging to different biogroups were compared for variations...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000100005

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

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

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

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

Growth of Cunninghamella elegans UCP 542 and production of chitin and chitosan using yam bean medium
Provedor de dados: 69
Autores: Stamford,Thayza Christina Montenegro; Stamford,Tânia Lucia Montenegro; Stamford,Newton Pereira; Barros Neto,Benicio de; Campos-Takaki,Galba Maria de.
Microbiological processes were used for chitin and chitosan productions by Cunninghamella elegans (UCP 542) grown in a new economic culture medium. The assay was carried out to evaluate the growth of C. elegans using yam bean (Pachyrhizus erosus L. Urban) medium, in different times of growth (24, 48, 72 and 96 hrs), incubated at 28ºC in an orbital shaker at 150 rpm. The lyophilized biomass was determined by gravimetry. The polysaccharides were extracted by alkali-acid treatment, and characterized by infrared spectroscopy, titration and viscosity. C. elegans grown in the yam bean medium and produced higher yields of biomass (24.3 g/ mL) in 96 hrs. The high level was chitosan (66 mg/g), and chitin (440 mg/g) were produced at 48 and 72 hrs of growth,...
Tipo: Journal article
Palavras-chave: Biopolymers; Chitin; Chitosan.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100006

Yeast lipases: enzyme purification, biochemical properties and gene cloning
Provedor de dados: 69
Autores: Vakhlu,Jyoti.
Lipases are placed only after proteases and carbohydrases in world enzyme market and share about 5% of enzyme market. They occur in plants, animals and microorganisms and are accordingly classified as plant, animal and microbial lipases. Wherever they exist, they function to catalyze hydrolysis of triglycerides to glycerol and fatty acid. Like carbohydrases and proteases, lipases of microbial origin enjoy greater industrial importance as they are more stable (compared to plant and animal lipases) and can be obtained in bulk at low cost. Majority of yeast lipases are extracelluar, monomericglycoproteins with molecular weight ranging between ~33 to ~65 kD. More than 50% reported lipases producing yeast, produce it in the forms of various isozymes. These...
Tipo: Journal article
Palavras-chave: Candida; Geotrichum; Lipase; Trichosporon; Yeast.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100010

PPAR&amp;#947;, FAS, HSL mRNA and protein expression during Tan sheep fat-tail development
Provedor de dados: 69
Autores: Xu,Xiaochun; Wei,Xuan; Yang,Yuxin; Niu,Wenzhi; Kou,Qifang; Wang,Xiaolong; Chen,Yulin.
Background The objective of this study was to investigate proliferator-activated receptor (PPAR&amp;#947;), fatty acid synthase (FAS) and hormone-sensitive lipase (HSL) mRNA and protein expression in fat tails of Tan sheep. Rams from different developmental stages (aged 3, 6, 9, 12, 15 and 18 months) were selected, and their tail measurements including length (L), width (W) and girth (G) were recorded. The mRNA and protein expressions of PPAR&amp;#947;, FAS and HSL were examined by quantitative real-time polymerase chain reaction (PCR) and Western blot. Results The tail measurements increased with age. We observed no significant differences (P &amp;gt; 0.05) of PPAR&amp;#947; mRNA expression between ages 9 and 15 months, and between 12 and 15 months; FAS...
Tipo: Journal article
Palavras-chave: Fat-tailed sheep; MRNA transcription; Protein expression; Transcription factor and enzyme genes.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000200010

Elevating the expression level of biologically active recombinant human alpha 1-antitrypsin in Pichia pastoris
Provedor de dados: 69
Autores: Arjmand,Sareh; Lotfi,Abbas Sahebghadam; Shamsara,Mehdi; Mowla,Seyed Javad.
Background: Human alpha 1-antitrypsin (AAT) is a potent inhibitor of multiple serine proteases, and protects tissues against their harmful effects. Individuals with reduced or abnormal production of this inhibitor need intravenous administration of exogenous protein. In this study, we employed the methylotrophic (methanol utilizing) yeast Pichia pastoris (P. pastoris) as a preferential host for efficient production and secretion of recombinant AAT. Furthermore, we examined different strategies to maximize the yield of the secreted protein. Results: Our findings revealed that optimizing the codon usage of AAT gene for P. pastoris had positive effects on the level of secreted AAT under the control of inducible alcohol oxidase 1 (AOX1) and constitutive...
Tipo: Journal article
Palavras-chave: Human alpha 1-antitrypsin; Pichia pastoris; Recombinant proteins.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000100004

Genetic variability for waxy genes in Argentinean bread wheat germplasm
Provedor de dados: 69
Autores: Vanzetti,Leonardo Sebastián; Pflüger,Laura Alicia; Rodríguez-Quijano,Marta; Carrillo,José Maria; Helguera,Marcelo.
Amylose and amylopectin are the two polysaccharides that constitute starch in bread wheat and the enzyme GBSSI (Granule-bound starch synthase I), also known as waxy protein, is responsible for amylose synthesis in storage tissues. Decrease of the amylose content in starch has been associated with the lack of waxy protein(s). In this work, different sets of PCR markers were used to characterize the genetic variability of waxy loci from 103 Argentinean bread wheat cultivars. For the Wx-A1 locus, Wx-A1a and a novel molecular allele designed Wx-A1g were detected. Wx-B1 locus showed three alleles (Wx-B1a, Wx-B1b, Wx-B1e), and Wx-D1 locus showed only the Wx-D1a allele. Novel single-locus allele specific markers for Wx-A1b, Wx-B1b and Wx-D1b null alleles were...
Tipo: Journal article
Palavras-chave: Characterization; Molecular markers; Triticum aestivum L.; Starch; Waxy genes; Wheat.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000100004

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

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

Root induction in radiata pine using Agrobacterium rhizogenes
Provedor de dados: 69
Autores: Li,Mingshan; Leung,David W.M.
Root induction using Agrobacterium rhizogenes was conducted in hypocotyl explants, intact seedlings, de-rooted seedling cuttings and adventitious shoots of radiata pine (Pinus radiata D. Don). Use of two A. rhizogenes strains (A4T and LB9402), with or without application of IBA, can trigger root formation in different explants. Strain LBA9402 was more effective than A4T in increasing rooting percentage and root number. Addition of 4.4 uMIBA to the medium further enhanced rooting from the cultured hypocotyl segments inoculated with the two A. rhizogenes strains. Strain LBA9402+IBA induced in about 75% of the cultured hypocotyl segments to form roots. In contrast the controls failed to initiate roots on intact seedlings or cultured segments in presence or...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300010

Efficiency of RAPD, ISSR, AFLP and ISTR markers for the detection of polymorphisms and genetic relationships in camote de cerro (Dioscorea spp.)
Provedor de dados: 69
Autores: Velasco-Ramírez,Ana Paulina; Torres-Morán,Martha Isabel; Molina-Moret,Sandy; Sánchez-González,José de Jesús; Santacruz-Ruvalcaba,Fernando.
Background At present, species known as camote de cerro (Dioscorea spp.) are found only in the wilderness in Mexico, but their populations are extremely depleted because they are indiscriminately collected, it is urgent to evaluate the conservation status of these plants in order to design conservation genetics programs. In this study, genetic diversity parameters along with cluster analysis based on Jaccard's coefficient were estimated with the objective to assess the efficiency of Random Amplified Polymorphic DNA (RAPD), Inter Simple Sequence Repeat (ISSR), Amplified Fragment Length Polymorphism (AFLP) and Inverse Sequence Tagged Repeat (ISTR) molecular DNA markers in the Dioscorea genus. Results The polymorphic information contents were quite similar...
Tipo: Journal article
Palavras-chave: Dioscoreaceae; Genetic diversity; Molecular markers; Tuber.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000200002

Production of polyhidroxyalkanoates by Pseudomonas putida KT2442 harboring pSK2665 in wastewater from olive oil mills (alpechín)
Provedor de dados: 69
Autores: Ribera,Rafael Garcia; Monteoliva-Sanchez,Mercedes; Ramos-Cormenzana,Alberto.
The nutritionally versatile Pseudomonas putida has showed to grow in olive oil waste water called "alpechín", which is toxic for many other microorganisms. The transformation with the plasmid pSK2665, harboring Alcaligenes eutrophus genes needed for synthesis of poly (3-hidroxybutyric acid), allow Pseudomonas strain to grow in high concentration of the wastewaters "alpechín" accumulating biodegradable thermoplastic.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200010

Microsatellite markers in candidate genes for wood properties and its application in functional diversity assessment in Eucalyptus globulus
Provedor de dados: 69
Autores: Acuña,Cintia V; Villalba,Pamela V; García,Martín; Pathauer,Pablo; Hopp,H. Esteban; Marcucci Poltri,Susana N.
Background: Functional genetic markers have important implications for genetic analysis by providing direct estimation of functional diversity. Although high throughput sequencing techniques for functional diversity analysis are being developed nowadays, the use of already well established variable markers present in candidate genes is still an interesting alternative for mapping purposes and functional diversity studies. SSR markers are routinely used in most plant and animal breeding programs for many species including Eucalyptus. SSR markers derived from candidate genes (SSR-CG) can be used effectively in co-segregation studies and marker-assisted diversity management. Results: In the present study, eight new non reported SSRs were identified in seven...
Tipo: Journal article
Palavras-chave: Functional markers; Genetic diversity; Lignin pathway; SSR; Wood density.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200002

Effect of free ammonia nitrogen on the methanogenic activity of swine wastewater
Provedor de dados: 69
Autores: Belmonte,Marisol; Hsieh,Chia-Fang; Figueroa,Cindy; Campos,José Luis; Vidal,Gladys.
Swine wastewater is characterized by high organic matter content, solids, nitrogen (expressed as total ammonia and protein) and heavy metals. This work determines the methanogenic toxicity effect of free ammonia contained in swine wastewater comparing raw swine wastewater (RW) and the liquid fraction of swine wastewater (TW). The values of IC50 (50% of inhibition) obtained for methanogenic bacteria ranged between 56 and 84% for RW, meanwhile IC50 for TW was ranged between 84 and 94%. Such inhibitory effects can be related to the free ammonia nitrogen concentration (&gt; 40 mg NH3-N/L) contained in swine wastewater.
Tipo: Journal article
Palavras-chave: Free ammonia nitrogen; Methanogenic activity; Swine wastewater.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300002

Immobilization and stability studies of a lipase from thermophilic Bacillus sp: The effect of process parameters on immobilization of enzyme
Provedor de dados: 69
Autores: Nawani,Neerupma; Singh,Rajvinder; Kaur,Jagdeep.
A thermostable lipase was partially purified from the culture supernatant of a thermophilic Bacillus sp. The enzyme is optimally active at 60&amp;ordm;C and pH 8.0. The enzyme showed enhancement in activity in presence of benzene or hexane (30% v/v each). The activity (assayed by determining the release of pNP from pNP laurate) was stimulated up to 60% of these solvents in enzyme reaction mixture. The catalytic properties of this thermostable enzyme can be further improved via the use of different immobilization techniques and reaction conditions. Enzyme was immobilized on different solid supports and their enzyme activity and stability was compared. The enzyme was adsorbed on silica and HP-20 beads followed by cross-linking with gluteraldehyde on HP-20,...
Tipo: Journal article
Palavras-chave: Esterification; Immobilization; Lipase; Thermostability.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500011

Gill tissues of the mussel Mytilus edulis chilensis: A new source for antimicrobial peptides
Provedor de dados: 69
Autores: Mercado,Luis; Schmitt,Paulina; Marshall,Sergio H; Arenas,Gloria.
Antimicrobial peptides are small-sized, cationic and amphipathic molecules able to neutralize pathogenic microorganisms. Their antimicrobial effects tie them to mechanisms of immune defense, which is why they have been normally purified from immune cells. We describe an apparently new group of antimicrobial peptides from gill tissues of the mussel Mytilus edulis chilensis. 20 specimens yielded 40 g of gills which produced 16 mg of an enriched fraction with antimicrobial activity as low as 0.045 &amp;micro;g/&amp;micro;l over reference strains. Considering the chemical nature of these molecules we used an acid extraction procedure followed by consecutive cationic exchange and hydrophobic interaction chromatography steps for peptide enrichment. The resulting...
Tipo: Journal article
Palavras-chave: Antimicrobial peptides; Biochemical characterization; Gill tissues; In vitro activity; Mussels.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300008

Field defects in progression to adenocarcinoma of the colon and esophagus
Provedor de dados: 69
Autores: Bernstein,Carol; Bernstein,Harris; Payne,Claire; Garewal,Harinder.
A field of defective tissue (field defect) appears to be an early stage in the progression to adenocarcinoma of both the colon and the esophagus. In both cases the field is comprised of cells characterized by resistance to induction of apoptosis, aberrant increased proliferation and genomic instability. Specific mutations and epimutations occur in both types of field. Also there is evidence for aberrant overexpression or underexpression of specific proteins. Most of these early molecular alterations appear to promote either enhanced apoptosis resistance, proliferation, or genomic instability. The molecular alterations that are present early are often, but not always, also present to an even greater degree in the cancer itself. Many of the important events...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000300001

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

Oxygen mass transfer studies on batch cultivation of P. aeruginosa in a biocalorimeter
Provedor de dados: 69
Autores: Sivaprakasam,Senthilkumar; Mahadevan,Surianarayanan; Gopalaraman,Swaminathan.
In the present work volumetric mass transfer coefficient (kLa) was investigated during batch cultivations of Pseudomonas aeruginosa on a nutrient media. The effects of process variables (viz. impeller speed, oxygen flow and geometry of impeller) on the volumetric mass transfer coefficient of oxygen, kLa, in a biocalorimeter (Bio-RC1) was investigated and reported in this research work. The experimental data have been analyzed employing MATLAB to obtain the influences of the process parameters on kLa. An attempt was made to correlate volumetric mass transfer coefficient with metabolic heat production rate at optimized process conditions. The correlation reported in this work would be useful to control and scale up of bioprocesses.
Tipo: Journal article
Palavras-chave: Biocalorimeter; Metabolic heat; P. aeruginosa; Scale-up; Volumetric mass transfer coefficient.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100008

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

Over-expression of CYP78A98, a cytochrome P450 gene from Jatropha curcas L., increases seed size of transgenic tobacco
Provedor de dados: 69
Autores: Tian,Yinshuai; Zhang,Min; Hu,Xiaole; Wang,Linghui; Dai,Jiao; Xu,Ying; Chen,Fang.
Background: Jatropha curcas L. (further referred to as Jatropha), as a rapidly emerging biofuel crop, has attracted worldwide interest. However, Jatropha is still an undomesticated plant, the true potential of this shrub has not yet been fully realized. To explore the potential of Jatropha, breeding and domestication are needed. Seed size is one of the most important traits of seed yield and has been selected since the beginning of agriculture. Increasing the seed size is a main goal of Jatropha domestication for increasing the seed yield, but the genetic regulation of seed size in Jatropha has not been fully understood. Results: We cloned CYP78A98 gene from Jatropha,a homologue of CYP78A5 in Arabidopsis.Wefound that CYP78A98 was highly expressed in male...
Tipo: Journal article
Palavras-chave: Biodiesel; Breeding; CYP78A5; Jatropha.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100003

Genetic diversity in two Italian almond collections
Provedor de dados: 69
Autores: Rigoldi,Maria Pia; Rapposelli,Emma; De Giorgio,Donato; Resta,Paolo; Porceddu,Andrea.
Background Sweet-seeded domesticated almonds were brought to the Mediterranean Basin from central Asia about 4000 years ago. In Italy, most of the almonds produced are cultivated in the southern part of the country. Local populations of the tree in Sardinia are largely seed-derived and mostly self-incompatible, so have developed extensive genetic diversity. The need to protect biodiversity has prompted a revived interest in local genetic materials in almond. Two Italian collections have been established, one in Sardinia and the other in Apulia. These collections were the focus of the present evaluation of genetic diversity. Results Eleven SSRs (microsatellites) were used for fingerprinting. The Sardinian germplasm was highly polymorphic, revealing a mean...
Tipo: Journal article
Palavras-chave: Biodiversity; Genetic structure; Prunus amygdalus; SSR.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100008

Wild ornamental germplasm exploration and domestication based on biotechnological approaches: In vitro colchicine treatment to obtain a new cultivar of Scoparia montevidiensis
Provedor de dados: 69
Autores: Escandón,Alejandro S; Miyajima,Ikuo; Alderete,Marisol; Hagiwara,Juan Carlos; Facciuto,Gabriela; Mata,Diego; Soto,Silvina M.
The genus Scoparia is native from Argentina. The diversity of colours and shape of their flowers bestows this genus a very interesting ornamental potential. The purpose of the present study is to explore the Scoparia species germplasm by means of in vitro polyploidization in order to improve their ornamental qualities. Accessions of S. montevidiensis var. montevidiensis, S. montevidiensis var. glandulifera, S. nudicaulis, S. hasleriana and S. dulcis were collected and maintained under greenhouse conditions. The Murashige-Skoog medium, supplemented with 0.25 mg/L BAP was used for the nodal segments multiplication of the five Scoparia species. Except for S. hasleriana, the multiplication rate of the other species ranged between 10 and 12 shoots per explant....
Tipo: Journal article
Palavras-chave: Chimera; Flow cytometry; Micropropagation; Ornamental plants; Tetraploid.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200010

Estimation of phylogenetic relationships of Phlomis species based on seed protein polymorphism
Provedor de dados: 69
Autores: Yüzbasioglu,Ertugrul; Dadandi,Mehmet Yasar; Özcan,Servet.
In this study, phylogenetic relationships among 39 Phlomis taxa were investigated based on seed protein profiles produced by sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE). A total of 21 polypeptide bands were scored, of which, 19 were polymorphic among the taxa of the genus Phlomis. A distance matrix was generated from the similarity matrix which was computed by using Jaccard&amp;#8217;s similarity coefficients, based on polymorphic bands and then an UPGMA tree was established through cluster analysis performed on the distance matrix. Genetic distances ranged from 0.00 to 0.50 within subsection Dendrophlomis; from 0.00 to 0.625 within subsection Gymnophlomis and from 0.00 to 0.769 within subsection Oxyphlomis. The UPGMA tree formed...
Tipo: Journal article
Palavras-chave: Phlomis; Phlomoides; Phlomis taxa; SDS-PAGE; Seed proteins.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200002

Trametes versicolor growth and laccase induction with by-products of pulp and paper industry
Provedor de dados: 69
Autores: Rebelo Barreto Xavier,Ana Maria; Mora Tavares,Ana Paula; Ferreira,Rita; Amado,Francisco.
The cultivation of Trametes versicolor for laccase production and cell growth were strongly dependent on experimental conditions namely physical and chemical parameters as well as nutrient availability and inducer stimulation. Biomass growth was compared for a rich medium and for a defined medium in two different temperatures. The best temperature was 28ºC and the maximum specific growth rates were µmax = 0.083 h-1 for the rich medium and µmax = 0.043 h-1 for the defined medium. It was clearly shown that laccase production is not associated with cell growth, indicating that this ligninolytic enzyme must be produced in the defined medium by a secondary metabolism. In order to obtain laccase induction, addition of solid lignin, lignosulphonates, veratryl...
Tipo: Journal article
Palavras-chave: Inducers; Laccase; Pulp and paper by-products; Trametes versicolor.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300012

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

Management of the appropriate agricultural biotechnology for small producers: Bolivia case study
Provedor de dados: 69
Autores: Avila,Teresa; Izquierdo,Juan.
The Bolivia study is part of an ongoing multiple case study organized by the FAO's Regional Office for Latin America and the Caribbean as part of the activities of the Technical Cooperation Network on Agricultural Biotechnology (REDBIO/FAO). The basic information was obtained through a survey and/or direct interview to a significant number of experts from Bolivian institutions involving management, regulation, research, innovation, application and education of agricultural biotechnology. At national level, the most relevant applied agri-biotechnologies are presently in vitro plant culture, genomics, molecular genetics, assisted reproduction techniques in animals, and techniques supporting plant and animal disease diagnosis. They have been developed and...
Tipo: Journal article
Palavras-chave: Andean crops; Appropriate biotechnology; Biotechnology administration; Bolivia; Genetic resources; Policy; REDBIO/FAO; Regulations; Technical cooperation network on plant biotechnology.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100002

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

Why are most Europeans opposed to GMOs?: Factors explaining rejection in France and Europe
Provedor de dados: 69
Autores: Bonny,Sylvie.
A strong movement of opposition to GMOs developed in the late 1990s in many countries, especially in Europe, although these technologies were presented from the outset as highly promising and their advantages were often highlighted. How can this rejection be explained? The aim of this paper is to answer that question through the case of France, which is fairly representative in this respect of various European countries, even if the opposition movement is here particularly strong. One examines various factors, actors and processes that have led to such strong opposition to GMOs that at this stage their development in Europe has almost totally been halted. In the first part of the article we recall the results of several recent surveys, showing the level of...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100008

Isolation of functional total RNA from Argemone mexicana tissues
Provedor de dados: 69
Autores: Rubio-Piña,Jorge A; Vázquez-Flota,Felipe A.
RNA extraction from recalcitrant plant tissues is frequently complicated by the presence of secondary metabolites, polysaccharides and polyphenols. These compounds may co precipitate with RNA, often rendering it unsuitable for either cDNA synthesis or hybridization in northern blot analyses and therefore, interfering with the gene analysis expression in such tissues. We have developed an efficient RNA extraction method from A. mexicana tissues. The procedure includes the use of polyvinylpolypyrrolidone (PVPP), to remove secondary metabolites, proteins and polyphenols, and a two-step precipitation with LiCl, to eliminate polysaccharides, and thus increasing RNA yield. The quality of the resulting RNA was evaluated spectrophotometrically and by agarose gel...
Tipo: Journal article
Palavras-chave: Argemone mexicana; Plant tissues; RNA isolation; Secondary metabolites.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400015

Selection of reference genes for normalization of quantitative real-time PCR in cell cultures of Cyclamen persicum
Provedor de dados: 69
Autores: Hoenemann,Claudia; Hohe,Annette.
As a prerequisite for gene expression analyses in cell cultures of the ornamental crop Cyclamen persicum basic parameters for quantitative real-time polymerase chain reaction (qRT-PCR) have been established including the selection of reference genes using the software tools &amp;#8216;geNorm&amp;#8217; and &amp;#8216;NormFinder&amp;#8217;. Five potential reference genes have been tested (elongation factor tu (Ef-Tu), putative ABC transporter ATPase, putative conserved oligomeric Golgi (COG) complex component, V-ATPase G subunit 1 and Histone H3-K9 methyltransferase 4 (H3-K9-HMTase 4)). &amp;#8216;NormFinder&amp;#8217; as well as &amp;#8216;geNorm&amp;#8217; identified Ef-Tu to be the least stable reference gene while the ranking of the most stable genes...
Tipo: Journal article
Palavras-chave: Gene expression analysis; In vitro propagation; Primer design; Somatic embryogenesis.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100012

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

The whole-cell immobilization of D-hydantoinase-engineered Escherichia coli for D-CpHPG biosynthesis
Provedor de dados: 69
Autores: Jin,Yuan-yuan; Li,Ya-dong; Sun,Wan; Fan,Shuai; Feng,Xiao-zhou; Wang,Kang-you; He,Wei-qing; Yang,Zhao-yong.
Background: D-Hydroxyphenylglycine is considered to be an important chiral molecular building-block of antibiotic reagents such as pesticides, and &amp;#946;-lactam antibiotics. The process of its production is catalyzed by D-hydantoinase and D-carbamoylase in a two-step enzyme reaction. How to enhance the catalytic potential of the two enzymes is valuable for industrial application. In this investigation, an Escherichia coli strain genetically engineered with D-hydantoinase was immobilized by calcium alginate with certain adjuncts to evaluate the optimal condition for the biosynthesis of D-carbamoyl-p-hydroxyphenylglycine (D-CpHPG), the compound further be converted to D-hydroxyphenylglycine (D-HPG) by carbamoylase. Results: The optimal medium to produce...
Tipo: Journal article
Palavras-chave: Calcium alginate; D-Carbamoyl-p-hydroxyphenylglycine; D-Hydantoinase; D-Hydroxyphenylglycine; Immobilization; Whole cell.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300004

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

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

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

Immortalized human keratinocytes: A model system to study the efficacy of therapeutic drugs in response to the chemical warfare agent sulfur mustard (HD)
Provedor de dados: 69
Autores: Vazquez,Raymond; Nelson,Marian R; Guzman,Juanita J; Corun,Charlene M; Steinberg,Mark.
Cytokines have been established as biomarkers to detect exposure of cells to chemical warfare agents such as sulfur mustard (2,2'-dichlorodiethyl sulfide, HD). In this study cultured normal and SV40 immortalized human epidermal keratinocyte (NHEK/IHEK) cells were compared as potential model systems to measure the efficacy of therapeutic drugs against HD. Immortalized human epidermal keratinocytes resemble their primary cell counterparts but have the advantage of being carried through long-term culture. Immortalized cells also provide consistency and durability and are less costly than primary keratinocytes. Immunoassay studies were performed to examine the response of these two cell lines to HD. We found that both normal and immortalized NHEKs secreted the...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200006

Wheat biotechnology: A minireview
Provedor de dados: 69
Autores: Patnaik,Debasis; Khurana,Paramjit.
Due to the inherent difficulties associated with gene delivery into regenerable explants and recovery of plantlets with the introduced transgene, wheat was the last among cereals to be genetically transformed. This review attempts to summarize different efforts in the direction of achieving genetic transformation of wheat by various methods. Particle bombardment is the most widely employed procedure for the introduction of marker genes and also for the generation of transformed wheat with introduction of agronomically important genes for quality improvement, engineering of nuclear male sterility, transposon tagging, resistance to drought stress, resistance against fungal pathogens and insect resistance. The other methods of choice of gene delivery into...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200007

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

Effects of temperature on the sorption of Pb2+ and Cd2+ from aqueous solution by Caladium bicolor (Wild Cocoyam) biomass
Provedor de dados: 69
Autores: Horsfall Jnr,Michael; Spiff,Ayebaemi I.
This report is based on the investigation of the effect of temperature on the removal of Pb2+ and Cd2+ in aqueous effluent using C. bicolor biomass in a batch sorption process. The result showed that the most suitable sorption temperature was 40ºC with maximum sorption capacities of 49.02 mg/g and 52.63 mg/g for Pb2+ and Cd2+ respectively. Various thermodynamic parameters, such as &amp;#916;Gº, &amp;#916;Hº, &amp;#916;Sº and Ea have been calculated. The data showed that the sorption process is spontaneous and exothermic in nature and that lower solution temperatures favours metal ion removal by the biomass. The findings of this investigation suggest that physical sorption plays a role in controlling the sorption rate. The sticking probability model was...
Tipo: Journal article
Palavras-chave: Biosorption; Cocoyam; Heavy metals removal; Temperature; Thermodynamics of sorption; Waste management.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200005

PCR-based sensitive detection of the edible fungus Boletus edulis from rDNA ITS sequences
Provedor de dados: 69
Autores: Lian,Bin; Zang,Jin-ping; Hou,Wei-guo; Yuan,Sheng; Smith,Donald L.
Identification of commercially important fungi, such as the valuable edible fungus Boletus edulis can be difficult considering visual or metabolic approaches. Based on phylogenetic analysis of the rDNA ITS sequence, a pair of specific primers was designed for differentiating B. edulis from other mushrooms by PCR. PCR was performed with total DNA as a template at an annealing temperature between 56-60ºC. Positive amplicons were obtained from B. edulis with all DNA templates from fruit bodies and cultured mycelium, but not from other fungal species at an annealing temperature of 60ºC. The result indicated that B. edulis could be clearly distinguished from other fungi by PCR, and there were no misidentifications under the reaction conditions used. The primers...
Tipo: Journal article
Palavras-chave: Boletus edulis; Detection; Edible fungi; Internal transcribed spacer; PCR; Specific primers.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300011

Introduction of antifungal genes in sunflower via Agrobacterium
Provedor de dados: 69
Autores: Radonic,Laura Mabel; Zimmermann,Julián Marcos; Zavallo,Diego; López,Nilda; López Bilbao,Marisa.
There is evidence that overexpression of transgenes codifying antifungal proteins may confer protection to pathogen attack, and that this protection is increased due to the synergic effect of the expression of two or more genes. On the other hand it is well known that sunflower is a recalcitrant specie, highly difficult to be genetically transformed. In this context, the final aim of this project was to obtain sunflower plants expressing at least two antifungal genes, avoiding sequential transformation. The antifungal genes used encode for two enzymes that degrade the fungal wall (glucanase and chitinase), an osmotin and a ribosome inhibitor protein. Two types of transformation vectors were used: a more traditional system with a double cassette and a novel...
Tipo: Journal article
Palavras-chave: Antifungal genes; Double expression cassettes; Polyprotein cassettes; Sunflower; Transgenic plants.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500008

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

Topological analysis of carbon flux during multi-stress adaptation in Halomonas sp. AAD12
Provedor de dados: 69
Autores: Mangaoglu Yoruk,Hilal; Alpagu Sayar,Nihat.
Background Osmolytes with their effective stabilizing properties are accumulated as protectants not only against salinity but also against denaturing harsh environmental stresses such as freezing, drying, high temperatures, oxygen radicals and radiation. The present work seeks to understand how Halomonas sp. AAD12 cells redirect carbon flux specifically to replenish reactions for biomass and osmolyte synthesis under changing salinity and temperature. To accomplish this goal, a combined FBA-PCA approach has been utilized. Results Experimental data were collected to supply model constraints for FBA and for the verification of the model predictions, which were satisfactory. With restrictions on the various combinations of selected anaplerotic paths (reactions...
Tipo: Journal article
Palavras-chave: Flux balance analysis; Flux distribution; Halomonas sp. AAD12; Halophilic; Principle component analysis.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600015

Impact of simulated acid rain on soil microbial community function in Masson pine seedlings
Provedor de dados: 69
Autores: Wang,Lin; Chen,Zhan; Shang,He; Wang,Jing; Zhang,Peng-yan.
Background Accompanying its rapid economic development and population growth, China is the world's third largest acid rain region, following Europe and North America. The effects of acid rain on forest ecosystem were widely researched, including the growth, the nutrient of the leaf and soil, and so on. However, there are few reports about the effects of acid rain on the soil microbial diversity. This study investigated the effects of acid rain on soil microbial community function under potted Masson pine seedlings (Pinus massoniana Lamb). Results After 7 months of treatment with simulated acid rain, the low acid load treatment (pH 5.5) stimulated soil microbial activity, and increased soil microbial diversity and richness, while the higher levels of acid...
Tipo: Journal article
Palavras-chave: Biolog; Metabolic capability; Soil microbial activity; Soil microbial diversity and richness.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500002

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

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

Physiological, morphological, and mannanase production studies on Aspergillus niger uam-gs1 mutants
Provedor de dados: 69
Autores: De Nicolás-Santiago,Soledad; Regalado-González,Carlos; García-Almendárez,Blanca; Fernández,Francisco J; Téllez-Jurado,Alejandro; Huerta-Ochoa,Sergio.
Mutant strains from Aspergillus niger UAM-GS1 were produced by UV radiation to increase their hemicellulolytic and cellulolytic activity production. The mutant strains showing more enzymatic activity were those labelled GS1-S059 and GS1-S067. These strains also showed the largest relationship between diameter of hydrolysis zone and colony diameter. The mutant GS1-S067 showed a colony radial extension rate and a biomass growth rate g biomass/(cm² h), 1.17 times higher than that achieved by strain UAM-GS1. The high invasive capacity makes this mutant strain a promising alternative for its use in solid substrate fermentation (SSF). The morphological properties of the two mutant strains were evaluated by using scanning electron microscopy. The diameter of the...
Tipo: Journal article
Palavras-chave: Aspergillus niger; Mutation; Mannanase production.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100008

Protective effect of an antimicrobial peptide from Mytilus edulis chilensis expressed in Nicotiana tabacum L.
Provedor de dados: 69
Autores: Arenas,Gloria; Marshall,Sergio H.; Espinoza,Valeria; Ramírez,Ingrid; Peña-Cortés,Hugo.
A "defensin-like" antibacterial peptide from Mytilus edulis chilensis, was sub-cloned into a binary vector for expression in plant tissues. The resulting new clone was electroporated into A. tumefaciens to transform tobacco plants. The presence of the construct in transgenic tobacco lines was demonstrated through RT-PCR, Northern and Western blots. Transformed positive plants were selected and grown for challenging. Tobacco leaves were infiltrated with Pseudomonassyringae pv. syringae and visual lesions determined at different times post-exposure. Of seven plants exposed, four gave variable protection up to seven days post-infection while one of them appears to be fully protected. These results suggest that defensin-like antimicrobial peptides from...
Tipo: Journal article
Palavras-chave: Antibacterial peptide; Disease resistance; In vivo expression; Nicotiana tabacum L.; Pseudomonassyringae pv. syringae; Transgenic tobacco plants.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200008

Genetic diversity analysis of traditional and improved cultivars of Pakistani rice (Oryza sativa L.) using RAPD markers
Provedor de dados: 69
Autores: Rabbani,Malik Ashiq; Pervaiz,Zahida Hassan; Masood,Muhammad Shahid.
The molecular marker is a useful tool for assessing genetic variations and resolving cultivar identities. Information on genetic diversity and relationships among rice genotypes from Pakistan is currently very limited. The objective of this study was to evaluate the genetic polymorphisms and identities of 10 traditional, 28 improved and 2 Japanese cultivars of rice using the random amplified polymorphic DNA technique. Twenty-five decamer-primers could generate a total of 208 RAPD fragments, of which 186 or 89.4% were polymorphic. The number of amplification products produced by each primer varied from 4 to 16 with an average of 8.3 bands primer-1. The size of amplified fragments were ranged from 200 to 4000 bp. Pair-wise Nei and Li's similarity had...
Tipo: Journal article
Palavras-chave: Cultivar discrimination; Genetic variability; Oryza sativa; Pakistani rice; RAPDs.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300006

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

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

PCR-based DGGE and FISH analysis of methanogens in an anaerobic closed digester tank for treating palm oil mill effluent
Provedor de dados: 69
Autores: Tabatabaei,Meisam; Zakaria,Mohd Rafein; Rahim,Raha Abdul; Wright,André-Denis G.; Shirai,Yoshihito; Abdullah,Norhani; Sakai,Kenji; Ikeno,Shinya; Mori,Masatsugu; Kazunori,Nakamura; Sulaiman,Alawi; Hassan,Mohd Ali.
16S ribosomal RNA (rRNA)-targeted fluorescent in situ hybridization combined with polymerase chain reaction (PCR)-cloning, light microscopy using Gram stains, scanning electron microscopy and denatured gradient gel electrophoresis were used to reveal the distribution of methanogens within an anaerobic closed digester tank fed with palm oil mill effluent. For specific detection of methanogens, 16S rRNA-cloning analysis was conducted followed by restriction fragment length polymorphism (RFLP) for presumptive identification of methanogens. To cover the drawbacks of the PCR-cloning study, the organization of the microorganisms was visualized in the activated sludge sample by using fluorescent oligonucleotide probes specific to several different methanogens,...
Tipo: Journal article
Palavras-chave: Anaerobic digestion; DGGE; FISH; Methanogens; POME.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300012

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

Novel antimicrobial activity of a dichloromethane extract obtained from red seaweed Ceramium rubrum (Hudson) (Rhodophyta: Florideophyceae) against Yersinia ruckeri and Saprolegnia parasitica, agents that cause diseases in salmonids
Provedor de dados: 69
Autores: Cortés,Yurima; Hormazábal,Emilio; Leal,Hellmuth; Urzúa,Alejandro; Mutis,Ana; Parra,Leonardo; Quiroz,Andrés.
Background Enteric red mouth disease and Saprolegniasis, which are caused by the bacteria Yersinia ruckeri and the oomycete Saprolegnia parasitica, respectively, are important illnesses that affect salmonid farming. Sanitary problems in farms are addressed by the prevention of disease outbreaks or by the treatment of diseases with chemicals. Environmental and governmental restrictions, toxicity and high treatment costs limit the use of drugs. Marine organisms, such as algae, sponges and corals, have developed an antimicrobial defense strategy based on the production of bioactive metabolites. Among these organisms, seaweeds offer a particularly rich source of potential new drugs. Hence, many pharmacologically active substances have been isolated from...
Tipo: Journal article
Palavras-chave: Antimicrobial activity; Bacteria; Fish pathogens; Lipophilic extract.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000300004

Identification of chilling-responsive transcripts in peanut (Arachis hypogaea L.)
Provedor de dados: 69
Autores: Tang,Yue Yi; Wang,Chuan Tang; Yang,Guan Pin; Feng,Tong; Gao,Hua Yuan; Wang,Xiu Zhen; Chi,Xiao Yuan; Xu,Ya Long; Wu,Qi; Chen,Dian Xu.
To isolate differentially expressed peanut genes responsive to chilling, a suppression subtractive hybridization (SSH) cDNA library was constructed for a chilling tolerant peanut cultivar A4 with mRNAs extracted from the seeds imbibed at 2ºC and 15ºC, respectively, for 24 hrs. A total of 466 cDNA clones were sequenced, from which 193 unique transcripts (73 contigs and 120 singlets) were assembled. Of these unique transcripts, 132 (68.4%) were significantly similar to the sequences in GenBank non-redundant (nr) protein database, which belonged to diverse functional categories including metabolism, signal transduction, stress response, cell defense and transcriptional regulation. The remaining 61 (31.6%) showed no similarity to either hypothetical or known...
Tipo: Journal article
Palavras-chave: Chilling response; Peanut; Real-time quantitative PCR; Suppression subtractive hybridization.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500005

Ranking agro-technical methods and environmental parameters in the biodegradation of petroleum-contaminated soils in Nigeria
Provedor de dados: 69
Autores: Kogbara,Reginald B.
A combination of experimental cells consisting of some agro-technical methods aimed at accelerating the biodegradation of petroleum contaminated soils were evaluated in order to ascertain the relevance of these methods and the relative attention due necessary soil environmental parameters. The methods of treatment involved the variation of tilling, watering and nutrient application, plus biopile and phytoremediation treatments. In the experiments described, petroleum contamination of soils was simulated under field conditions, the remedial treatments were then utilized for clean up. Analysis of soil parameters after a six-week study period showed an increase in total heterotrophic bacteria (THB) counts across all the treatments, with THB counts increasing...
Tipo: Journal article
Palavras-chave: Bioremediation methods; Performance index; Phytoremediation; Total hydrocarbon content.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100011

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

Production, purification and characterization of recombinant human antithrombin III by Saccharomyces cerevisiae
Provedor de dados: 69
Autores: Mallu,Maheswara Reddy; Vemula,Sandeep; Ronda,Srinivasa Reddy.
Background: Antithrombin III (ATIII) is a protein that inhibits abnormal blood clots (or coagulation) by breaking down thrombin and factor Xa. ATIII helps to keep a healthy balance between hemorrhage and coagulation. The present work demonstrated the production, purification and characterization of recombinant human antithrombin (rhAT) from yeast Saccharomyces cerevisiae BY4741 was demonstrated. After expression of rhAT by S. cerevisiae, the biomass and rhAT concentration were analyzed through fed-batch fermentation process. Results: In fed-batch fermentation, the biomass (maximum cell dry weight of 11.2 g/L) and rhAT concentration (312 mg/L) of the expressed rhAT were achieved at 84 h of cultivation time. The maximum cell lysis efficiency (99.89%) was...
Tipo: Journal article
Palavras-chave: Biological activity; Cell lysis; Cross flow filtration; Fed-batch fermentation; Purification; Secondary structure.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400012

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

Occurrence of the rust resistance gene Lr37 from Aegilops ventricosa in Argentine cultivars of wheat
Provedor de dados: 69
Autores: Bulos,Mariano; Echarte,Mariel; Sala,Carlos.
Leaf rust of wheat (Triticum aestivum L.) caused by the fungus Puccinia triticina (formerly P. recondita f. sp. tritici), is one of the most important foliar diseases of this crop. Lr37 rust resistance gene, which confers resistance in wheat against leaf rust, was introgressed into cultivated wheat from Aegilops ventricosa Tausch. Rust races with virulence to Lr37 have been identified in different countries, but it still provides resistance to a wide range of races and is useful in combination with other resistance genes. There are no reports about the presence, frequency and origin of Lr37 in Argentinean wheat cultivars. In this work, we analyzed 88 registered Argentinean wheat cultivars developed by different breeding companies and institutions during...
Tipo: Journal article
Palavras-chave: Diversity; Marker assisted selection; Puccinia triticina; Triticum aestivum; Translocation.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500014

The molecular characterization of a cyclophilin A from Chinese mitten crab Eriocheir sinensis and the antifungal activity of its recombinant protein
Provedor de dados: 69
Autores: Wang,Mengqiang; Zhang,Daoxiang; Wang,Lingling; Gai,Yunchao; Zhou,Zhi; Zhang,Huan; Song,Linsheng.
Background: Cyclophilin A (CypA), a receptor for the immunosuppressive agent cyclosporin A (CsA), is a cis-trans peptidyl-prolyl isomerase (PPIase) which accelerates the cis-trans isomerization of prolyl-peptide bonds and interacts with a variety of proteins to regulate their activities. Results: The full-length cDNA of crab Eriocheir sinensis CypA (EsCypA) was cloned by EST and RACE technique. The complete sequence of EsCypA cDNA contained a 5' untranslated region (UTR) of 50 bp, a 3&amp;#146; UTR of 233 bp with a polyA tail, and an open reading frame (ORF) of 495 bp encoding a polypeptide of 164 amino acids with the predicted molecular weight of 17.36 kDa. The deduced amino acid sequence of EsCypA contained two highly conserved signature sequences of...
Tipo: Journal article
Palavras-chave: Antifungal activity; Cyclophilin A; Eriocheir sinensis; Immune response; PPIase activity.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000200002

Evaluation of computer methods for biomarker discovery on computational grids
Provedor de dados: 69
Autores: Tonini,Gustavo; Siqueira,Frank.
Background: Discovering biomarkers is a fundamental step to understand and deal with genetic diseases. Methods using classic Computer Science algorithms have been adapted in order to support processing large biological data sets, aiming to find useful information to understand causing conditions of diseases such as cancer. Results: This paper describes some promising biomarker discovery methods based on several grid architectures. Each technique has some features that make it more suitable for a particular grid architecture. This matching depends on the parallelizing capabilities of the method and the resource availability in each processing/storage node. Conclusion: The study described in this paper analyzed the performance of biomarker discovery methods...
Tipo: Journal article
Palavras-chave: Feature selection; Genetics; Parallel computing; Pattern detection; Performance.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500013

Investigation of cultivation conditions for capsular polysaccharide production by Streptococcus pneumoniae serotype 14
Provedor de dados: 69
Autores: Moura Leal,Maria de Lourdes; da Silva Gomes Pereira,Denise; Jessouroun,Ellen; Peixoto Gimenes Couto,Maria Antonieta; Pereira Jr,Nei.
Streptococcus pneumoniae (pneumococcus) is among the most significant causes of bacterial disease in humans. Capsular polysaccharide (CPS) production is essential for pneumococcal virulence. Pneumococcal CPS has been widely used as vaccine antigen. This study is focused on the influence of culture conditions of Streptococcus pneumoniae serotype 14 as for developing an industrial method for polysaccharide production. The pH proved to be a highly important variable in batchwise culture. Using the pH control all glucose added was consumed resulting in a four-fold increase in polysaccharide productivity relative to cultivation without pH control. S. pneumoniae is a lactic acid bacterium, so named for its primary metabolic byproduct (lactate), which has an...
Tipo: Journal article
Palavras-chave: Polysaccharide capsular; Vaccine; Streptococcus pneumoniae.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500006

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

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

Overproduction of clavulanic acid by extractive fermentation
Provedor de dados: 69
Autores: Lopes Costa,Cecília Ladeira; Colli Badino,Alberto.
Background Clavulanic acid is an important beta-lactamase inhibitor produced as a secondary metabolite by the actinomycete Streptomyces clavuligerus. Clavulanic acid is chemically unstable; therefore, it is degraded during bacterial cultivation. In this work, the adsorbents clinoptilolite, activated carbon, calcined hydrotalcite, and Amberlite IRA 400 anionic exchange resin were studied in terms of their ability to adsorb clavulanic acid during extractive fermentation, in order to prevent product degradation and avoid product concentrations reaching inhibitory levels. Adsorption assays were used to investigate the effect of pH, and the decrease in the clavulanic acid concentration in the culture broth was measured for each adsorbent. Results IRA 400 was...
Tipo: Journal article
Palavras-chave: Adsorption; Clavulanic acid; Extractive fermentation; Integrated processing; Product inhibition.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300003

Overexpression of the pineapple fruit bromelain gene (BAA) in transgenic Chinese cabbage (Brassica rapa) results in enhanced resistance to bacterial soft rot
Provedor de dados: 69
Autores: Jung,Yu-Jin; Choi,Chang-Sun; Park,Jin-Heui; Kang,Hee-Wan; Choi,Je-Eul; Nou,Ill-Sup; Lee,Soon Youl; Kang,Kwon-Kyoo.
Bromelain is a crude protein extract obtained from pineapple stems, which comprises a variety of proteolytic enzymes. It exhibits potential therapeutic activities against trauma, inflammation, autoimmune diseases and malignant disorders. In this study, we cloned BAA1 (the gene encoding fruit bromelain) into a plant expression vector that was then used to transform Brassica rapa and overexpress BAA1 under the control of the cauliflower mosaic virus (CaMV) 35S promoter. We demonstrate that constitutive overexpression of BAA1 in B. rapa confers enhanced resistance to the soft rot pathogen Pectobacterium carotovorum ssp. carotovorum. These results suggest that it could be utilized for protecting plants from attack by bacterial pathogens
Tipo: Journal article
Palavras-chave: Brassica rapa; Fruit bromelain; Soft rot resistance; Transgenic plant.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100007

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

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

Effect of temperature and initial pH on biohydrogen production from palm oil mill effluent: long-term evaluation and microbial community analysis
Provedor de dados: 69
Autores: O-Thong,Sompong; Mamimin,Chonticha; Prasertsan,Poonsuk.
Anaerobic sludge from palm oil mill effluent (POME) treatment plant was used as a source of inocula for the conversion of POME into hydrogen. Optimization of temperature and initial pH for biohydrogen production from POME was investigated by response surface methodology. Temperature of 60ºC and initial pHof 5.5 was optimized for anaerobic microflora which gave a maximum hydrogen production of 4820 ml H2/l-POME corresponding to hydrogen yield of 243 ml H2/g-sugar. Total sugar consumption and chemical oxygen demand (COD) removal efficiency were 98.7% and 46%, respectively. Long-term hydrogen production in continuous reactor at HRT of 2 days, 1 day and 12 hrs were 4850 ± 90, 4660 ± 99 and 2590 ± 120 ml H2/l-POME, respectively. Phylogenetic analysis of the...
Tipo: Journal article
Palavras-chave: Biohydrogen; Long-term evaluation; Palm oil mill effluent; Response surface methodology; Thermophilic condition.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500009

Visualization of avian influenza virus infected cells using self-assembling fragments of green fluorescent protein
Provedor de dados: 69
Autores: Kanehira,Katsushi; Uchida,Yuko; Saito,Takehiko.
Background: Avian influenza viruses (AIVs) are influenza A viruses which are isolated from domestic and wild birds. AIVs that include highly pathogenic avian influenza viruses (HPAIVs) are a major concern to the poultry industry because they cause outbreaks in poultry with extraordinarily high lethality. In addition, AIVs threaten human health by occasional zoonotic infection of humans from birds. Tools to visualize AIV-infected cells would facilitate the development of diagnostic tests and preventative methods to reduce the spread of AIVs. In this study, a self-assembling split-green fluorescent protein (split-GFP) system, combined with influenza virus reverse genetics was used to construct a visualization method for influenza virus-infected cells....
Tipo: Journal article
Palavras-chave: Avian influenza virus; Reverse genetics; Split-GFP.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100010

Tilapia chromosomal growth hormone gene expression accelerates growth in transgenic zebrafish (Danio rerio)
Provedor de dados: 69
Autores: Morales,Reynold; Herrera,María Teresa; Arenal,Amílcar; Cruz,Asterio; Hernández,Oscar; Pimentel,Rafael; Guillén,Isabel; Martínez,Rebeca; Estrada,Mario P.
Gene transfer is economically important and model fish species has produced a great impact in modern biology and biotechnology. Transgenic zebrafish (Danio rerio) were generated through the co-injection of a GFP-expressing plasmid and an "all fish" transgene composed by the carp beta-actin promoter and the chromosomal tilapia (Oreochromis hornorum) growth hormone gene. The GFP expression was a good indicator of stable transformation and allowed for high efficiency selection of transgenic fish. Transgenic F1 zebrafish grew 20% faster than full sibling non-transgenic controls.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200004

Modeling of glutamic acid production by Lactobacillus plantarum MNZ
Provedor de dados: 69
Autores: Zareian,Mohsen; Ebrahimpour,Afshin; Mohamed,Abdul Karim Sabo; Saari,Nazamid.
Background: L-glutamic acid, the principal excitatory neurotransmitter in the brain and an important intermediate in metabolism acts as a precursor of &amp;#947;-amino butyric acid (GABA). In the present study, culture condition for enhanced glutamic acid production by Lactobacillus plantarum MNZ was optimized and the influence of such conditions on GABA production was evaluated. Results: Results indicated that glutamic acid increased up to 3-fold (3.35) under the following condition: pH 4.5, temperature 37ºC, 12% (w/v) glucose and 0.7% (w/v) ammonium nitrate; whilst GABA production was enhanced up to 10-fold under the following condition: pH 4.5, temperature 37ºC, 6% (w/v) glucose and 0.7% (w/v) ammonium nitrate. Conclusions: This is the first report for...
Tipo: Journal article
Palavras-chave: &amp;#947; -amino butyric acid functional foods lactic acid bacteria medium optimization response surface methodology.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400012

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

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

Production of an extracellular keratinase from Chryseobacterium sp. growing on raw feathers
Provedor de dados: 69
Autores: Brandelli,Adriano; Riffel,Alessandro.
The strain Chryseobacterium sp. kr6 shown to be useful for biotechnological purposes such as hydrolysis of poultry feathers and de-hairing of bovine pelts. The effect of temperature, initial pH and media composition on protease production by this keratinolytic strain was studied. The enzyme was produced between 25 and 37ºC, with maximum activity and yield at 30ºC. When protease production was tested in media with different initial pH, maximum activity was observed when cultivation was carried out at 30ºC and initial pH ranging from 6.0 to 8.0. Higher activity was observed when feathers or feather meal were used as growth substrates, followed by soybean meal. The addition of carbohydrates or surfactants to feather broth resulted in decrease in keratinolytic...
Tipo: Journal article
Palavras-chave: Bacteria; Enzyme; Keratin; Protease.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100007

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

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

Technology Exchange
Provedor de dados: 69
Autores: Douthwaite,Boru; Ortiz,Rodomiro.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200002

Isolation and characterization of drought-responsive genes from peanut roots by suppression subtractive hybridization
Provedor de dados: 69
Autores: Ding,Hong; Zhang,Zhi Meng; Qin,Fei Fei; Dai,Liang Xiang; Li,Chun Juan; Ci,Dun Wei; Song,Wen Wu.
Background Peanut (Arachis hypogaea L.) is an important economic and oilseed crop. Long-term rainless conditions and seasonal droughts can limit peanut yields and were conducive to preharvest aflatoxin contamination. To elucidate the molecular mechanisms by which peanut responds and adapts to water limited conditions, we isolated and characterized several drought-induced genes from peanut roots using a suppression subtractive hybridization (SSH) technique. Results RNA was extracted from peanut roots subjected to a water stress treatment (45% field capacity) and from control plants (75% field capacity), and used to generate an SSH cDNA library. A total of 111 non-redundant sequences were obtained, with 80 unique transcripts showing homology to known genes...
Tipo: Journal article
Palavras-chave: Drought-related genes; Drought stress; GO and KEGG analyses; Real-time reverse transcription-PCR.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600008

Optimization of &amp;#946;-carotene production by a newly isolated Serratia marcescens strain
Provedor de dados: 69
Autores: Wang,Bohua; Lin,Liping; Lu,Lei; Chen,Weiping.
&amp;#946;-carotene is a commonly used food colorant. In this work, a novel &amp;#946;-carotene producing strain, Serratia marcescens RB3, was isolated and identified by physiological and biochemical tests, as well as 16S rDNA sequence analysis. The production of &amp;#946;-carotene by S. marcescens RB3 was identified through HPLC analysis. The cultivation conditions for &amp;#946;-carotene production by S. marcescens RB3 were optimized as 2.0% lactose, 2.0% peptone, 0.3% beef extract, 1.0% NaCl supplemented with 0.05% Fe2+, pH 6.0 and 30ºC. Under the optimal conditions, the yield of &amp;#946;-carotene achieved 2.45 µg/mL.
Tipo: Journal article
Palavras-chave: &amp;#946; -carotene optimization pigment Serratia marcescens.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600003

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

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

Synthesis of silver nanoparticles using a biosurfactant produced in low-cost medium as stabilizing agent
Provedor de dados: 69
Autores: Farias,Charles B.B.; Ferreira Silva,Aline; Diniz Rufino,Raquel; Moura Luna,Juliana; Gomes Souza,José Edson; Sarubbo,Leonie Asfora.
Background A biosurfactant produced by Pseudomonas aeruginosa cultivated in a low-cost medium formulated with 2.5% vegetable oil refinery residue and 2.5% corn steep liquor and distilled water was employed to stabilize silver nanoparticles in the liquid phase. The particles were initially synthesized using NaBH4 as reducing agent in biosurfactant reverse micelles and were extracted from the micellar solution to disperse in heptane. Results A silver particle size in the range of 1.13 nm was observed. The UV-vis absorption spectra proposed that silver nanoparticles could be formed in the reverse micelles and relatively stabilized for at least 3 months without passivator addition. The Transmission Electron Microscope (TEM) shows that the silver nanoparticles...
Tipo: Journal article
Palavras-chave: Microbial surfactant; Nanoscale materials; Pseudomonas aeruginosa.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000300003

Natural selection in common bean microsatellite alleles and identification of QTLs for grain yield
Provedor de dados: 69
Autores: Leite,Monik Evelin; Santos,João Bosco dos; Carneiro,Flávia Fernandes; Couto,Karla Rodrigues.
Natural selection acts to select better adapted individuals or alleles in segregating population and help plant breeding. The objective of this work was to verify the effect of natural selection on microsatellite alleles as indicators of better adaptation and identification of quantitative trait loci (QTLs) for grain yield. This study evaluated 107 progenies from the F8 and 107 from the F24 generation derived from crossing Carioca MG and ESAL 686 lines, carried out by the bulk method, and evaluated in three different seasons: winter 2001; rainy 2001 and dry 2002. It was utilized 22 polymorphic markers and the natural selection acted in all of them. The frequency of the alleles of the parent Carioca MG, the most adapted, was increased in all of the 22 loci...
Tipo: Journal article
Palavras-chave: Bulk method; Fitness coefficient; Phaseolus vulgaris; SSR markers.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100005

Specific nutrient supplementation of defined serum-free medium for the improvement of CHO cells growth and t-PA production
Provedor de dados: 69
Autores: Altamirano,Claudia; Illanes,Andrés; Canessa,Rossana; Becerra,Silvana.
Recombinant CHO TF70R cells are able to grow and produce t-PA on serum-free medium BIOPRO1 (BioWhitaker Europe, Belgium). The purpose of the present study was to determine the effect of medium supplementation with vitamins, lipids, and specific amino acids on cell growth, t-PA production and biological functionality. Among vitamins, only biotin, folic acid, cobalamine and benzoic acid were required for improving growth and t-PA production. Lipid supplement allowed a significant increase cell concentration and t-PA specific activity and concentration, though its specific production rate decreased slightly. Medium supplementation with proline, serine and asparagine had also positive effects on cell growth. Besides, the addition of asparagine (even in the...
Tipo: Journal article
Palavras-chave: Amino acid; Cholesterol; Vitamins.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000100009

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

Lipopolyamine-mediated transfection of reporter plasmids into a fish cell line
Provedor de dados: 69
Autores: Villalobos,Patricio; Rojas,M. Verónica; Conejeros,Pablo; Marshall,Sergio H.
Conditions have been optimised to transfect the fish cell line CHSE-214 to measure expression, maintenance and putative chromosomal integration of the reporter gene LUC, spliced into two versions of an expression vector. The first is pCMVL, and the second p103, a novel pCMVL-derived plasmid to which a highly conserved tandem repeat from the salmon genome was added in an inverted configuration flanking the LUC gene to promote its chromosomal integration. A minimal ratio of one to one, lipopolyamine carrier to plasmid DNA, was enough to efficiently transfect the cell line to follow the fate of target DNAs up to five cell passages. In this time-span we demonstrated the maintenance of the foreign DNA in the cells, the concomitant expression of the reporter...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000200005

Ethics and Transgenic Crops: a Review
Provedor de dados: 69
Autores: Robinson,Jonathan.
This article represents a review of some of the ethical dilemmas that have arisen as a result of the development and deployment of transgenic crop plants. The potential for transgenic crops to alleviate human hunger and the possible effects on human health are discussed. Risks and benefits to the environment resulting from genetic engineering of crops for resistance to biotic and abiotic stresses are considered, in addition to effects on biodiversity. The socio-economic impacts and distribution of benefits from transgenic technologies are reviewed. Fundamental issues of man’s relationship with nature and the environment, and theological matters are also addressed. An almost unprecedented amount of discussion has been stimulated on the merits and demerits...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000200003

Growth responses of Betula pendula ecotypes to red and far-red light
Provedor de dados: 69
Autores: Tsegay,Berhanu A.; Lund,Leidulf; Nilsen,Jarle; Olsen,Jorunn E.; Molmann,Jorgen M.; Ernsten,Arild; Juntttila,Olavi.
The effect of Red light (R), Far-red light (FR) and R/FR combinations on shoot growth of latitudinal ecotypes of B. pendula was studied using special diodes that emit monochromatic lights. When a 12 hrs PAR (110 &amp;micro;mol m-2 s-1) was extended with R, FR or R/FR ratios, lower intensities of monochromatic lights could not prevent growth cessation. At 25 &amp;micro;mol m-2 s-1, FR compared to R enhanced stem elongation in all ecotypes. This was due to the inhibitive effect of R on internode elongation. When day-length was extended by R/FR at various ratios, there was continuous shoot elongation, but was found to be declining with increasing ratios. The more the R, the shorter were the internodes of each plant. B. pendula ecotypes produced branches when...
Tipo: Journal article
Palavras-chave: Diode; Ecotype; Monochromatic; Photomorphogenesis; Phytochrome; Photosynthetically active radiation; PAR.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100005

Scientific research and training in biotechnology in Latin America and the Caribbean: the UNU/BIOLAC experience
Provedor de dados: 69
Autores: Daza,Camilo.
It is well known that the number of researchers in Biotechnology in Latin America and the Caribbean is too small to cope with the needs of research and to successfully confront the number of short and long-term problems. The United Nations University created its Biotechnology Program for Latin America and the Caribbean, UNU/BIOLAC, and the results of the efforts aiming to the promotion of a shared sense of direction within the region´s scientific community are presented and discussed herein.
Tipo: Journal article
Ano: 1998
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581998000200005

The challenges of introducing a new biofungicide to the market: A case study
Provedor de dados: 69
Autores: Galindo,Enrique; Serrano-Carreón,Leobardo; Gutiérrez,Carlos Roberto; Allende,Raúl; Balderas,Karina; Patiño,Martín; Trejo,Mario; Wong,Miguel Angel; Rayo,Emma; Isauro,Darío; Jurado,Carlos.
Background: Scientific literature contains many reports documenting the isolation and antagonist-testing of microorganisms with the potential for biological control in agriculture, however, very few have addressed all aspects involved in the long process that occurs before a potential strain, found and tested in laboratory, can reach commercialization. Results: After a multi-institutional and multi-disciplinary effort to develop a biological control agent with remarkable technical characteristics and performance, the fungicide Fungifree AB® was recently introduced in Mexican market. This product that has no chemical residues and is environmentally friendly which can be used by mango, avocado, papaya and citrus fruits (and other crops in the short term)...
Tipo: Journal article
Palavras-chave: Biofungicides; Fungicides; Fungifree AB®; Process biotechnology.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300005

On the fermentative behavior of auxotrophic strains of Saccharomyces cerevisiae
Provedor de dados: 69
Autores: Paciello,Lucia; Zueco,Jesus; Landi,Carmine.
Background The selection of new yeast strains could lead to improvements in bioethanol production. Here, we have studied the fermentative capacity of different auxotrophic mutants of Saccharomyces cerevisiae, which are routinely used as hosts for the production of heterologous proteins. It has recently been found that these strains exhibit physiological alterations and peculiar sensitivities with respect to the parental prototrophic strains from which they derive. In this work the performance of auxotrophic S. cerevisiae CEN.PK strains was compared to the corresponding prototrophic strain, to S. cerevisiae T5bV, a strain isolated from grape must and to another auxotrophic strain, S. cerevisiae BY4741. Results The results indicate that the fermentative...
Tipo: Journal article
Palavras-chave: Auxotrophic yeast; CEN.PK strains; Ethanol yields; Fermentative capacity; Fermentative metabolism.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500009

Single embryoid body formation in a multi-well plate
Provedor de dados: 69
Autores: Ezekiel,Uthayashanker R; Muthuchamy,Mariappan; Ryerse,Jan S; Heuertz,Rita M.
Embryoid bodies (EB) formed from murine embryonic stem (ES) cells recapitulate many aspects of a developing embryo. Of specific importance, synchronous differentiation of EB recapitulates organ-specific development and is achieved in culture by formation of uniformly sized EB. The method described here demonstrates a simple and cost-effective way of generating EB from murine ES cells. Single EB are formed in a multi-well plate format and large numbers of EB are generated using a 96-well multi-well plate. Uniform single-sized EB formed in the multi-well are an ideal system for screening compounds and determining differentiation effects. Since EB contain all three germ layers, they are appropriate for studying small molecule effects on differentiation of ES...
Tipo: Journal article
Palavras-chave: Differentiation; EB; ES; Murine embryonic stem cell.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200015

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

Improvement of nitrate and nitrite reduction rates prediction
Provedor de dados: 69
Autores: Estuardo,Carolina; Martí,M. Cristina; Huiliñir,César; Aspé Lillo,Estrella; Roeckel von Bennewitz,Marlene.
Reported models of denitrification rates integrate in an unique parameter the pH-dependent inhibition by HNO2 and the pH effect on the bacterial metabolic activity; furthermore, they do not quantify separately the pH effect on the nitrate and on the nitrite reduction rates. The goal of this work was to quantify both effects on the kinetics of nitrate and nitrite reduction to improve the models&amp;#8217; predictive value. Assays were performed at a pH range of 6.5-9.0 in batch reactors at 37ºC with an activated sludge. At the studied pH range and at below the HNO2 inhibitory concentration (0.004 mg L-1), the maximum nitrate reduction rate diminished 23% and 50% by decreasing or increasing, respectively, one pH unit from 8.0. The maximum nitrite reduction...
Tipo: Journal article
Palavras-chave: Denitrification kinetics; Nitrate reduction; Nitrite reduction; PH.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300008

Recombinant expression of marine shrimp lysozyme in Escherichia coli
Provedor de dados: 69
Autores: de-la-Re-Vega,Enrique; García-Orozco,Karina D; Calderón-Arredondo,Sergio A; Romo-Figueroa,María Gabriela; Islas-Osuna,María A.; Yepiz-Plascencia,Gloria M.; Sotelo-Mundo,Rogerio R.
Shrimp Lysozyme (Lyz) is a key component of the antibacterial response as part of the innate defense in Crustacea; however, it has not been possible to purify this protein because of the very low amount present in the shrimp blood cells (hemocytes). In an effort to produce enough protein to study its function and biochemical properties we have overexpressed Lysozyme from marine shrimp (Penaeus vannamei) in E. coli. A bacterial protein expression system based on the T7 polymerase promoter was used. Although Lyz was produced as insoluble protein in inclusion bodies, its refolding led to an active protein with a yield of ~10%. Details of the protein recombinant expression techniques applied to this shrimp protein are presented
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300012

Profiling carbohydrate composition, biohydrogen capacity, and disease resistance in potato
Provedor de dados: 69
Autores: Diez-de-Medina Roldán,Sergio; Silva,Herman; Jeblick,Wolfgang; Nowik,Isabella; Modigell,Michael; Neuhaus,H. Ekkehard; Conrath,Uwe.
Background: Potato (Solanum tuberosum) is one of the most important sources of carbohydrates in human diet. Because of its high carbohydrate levels it recently has also received attention in biohydrogen production. To exploit the natural variation of potato with respect to resistance to major diseases, carbohydrate levels and composition, and capacity for biohydrogen production we analyzed tubers of native, improved, and genetically modified potatoes, and two other tuberous species for their glucose, fructose, sucrose, and starch content. Results: High-starch potato varieties were evaluated for their potential for Caldicellulosiruptor saccharolyticus-mediated biohydrogen production with Desirée and Rosita varieties delivering the highest biohydrogen...
Tipo: Journal article
Palavras-chave: Biohydrogen; Caldicellulosiruptor saccharolyticus; Carbohydrates; Natural variation; Phytophthora infestans; Potato.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600002

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

Two LTR retrotransposon elements within the abscisic acid gene cluster in Botrytis cinerea B05.10, but not in SAS56
Provedor de dados: 69
Autores: Zhao,Ming; Zhou,Jin yan; Tan,You jiu; Song,Wei wei; Li,Zhi dong; Tan,Hong.
The plant hormone abscisic acid has huge economic potential and can be applied in agriculture and forestry for it is considered to be involved in plant resistance to stresses such as cold, heat, salinity, drought, pathogens and wounding. Now overproducing strains of Botrytis cinerea are used for biotechnological production of abscisic acid. An LTR retrotransposon, Boty-aba, and a solo LTR were identified by in silico genomic sequence analysis, and both were detected within the abscisic acid gene cluster in B. cinerea B05.10, but not in B. cinerea SAS56. Boty-aba contains a pair of LTRs and two internal genes. The LTRs and the first gene have features characteristic of Ty3/gypsy LTR retrotransposons. The second gene is a novel gene, named brtn, which...
Tipo: Journal article
Palavras-chave: Botrytis cinerea; Genomic sequence analysis; In silico; LTR retrotransposon.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000100007

Identification of Saccharomyces cerevisiae strains for alcoholic fermentation by discriminant factorial analysis on electronic nose signals
Provedor de dados: 69
Autores: Calderon-Santoyo,Montserrat; Chalier,Pascale; Chevalier-Lucia,Dominique; Ghommidh,Charles; Ragazzo-Sanchez,Juan Arturo.
An electronic nose (E-nose) coupled to gas chromatography was tested to monitor alcoholic fermentation by Saccharomyces cerevisiae ICV-K1 and Saccharomyces cerevisiae T306, two strains well-known for their use in oenology. The biomass and ethanol concentrations and conductance changes were measured during cultivations and allowed to observe the standard growth phases for both yeast strains. The two strains were characterized by a very similar tendency in biomass or ethanol production during the fermentation. E-nose was able to establish a kinetic of the production of aroma compounds production and which was then easy to associate with the fermentation phases. Principal Component Analysis (PCA) showed that the data collected by E-nose during the...
Tipo: Journal article
Palavras-chave: Alcoholic fermentation; Discrimination; Electronic nose; Gas sensor; Yeasts.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400008

Isolation of high quality DNA: a protocol combining &amp;#8220;rennet&amp;#8221; and glass milk
Provedor de dados: 69
Autores: Valter de Oliveira,Luiz Felipe; Wallau,Gabriel da Luz; Silva Loreto,Elgion Lucio.
High quality DNA is essential for many molecular biology techniques. However, the reagents used for that purpose usually are expensive and/or cause a high environmental impact. Here, we describe two alternative protocols that use inexpensive reagents and are not hazardous to the environment. The first protocol utilizes the enzyme chymosin, normally used as &amp;#8220;rennet&amp;#8221; in cheese production and which is easily obtained on the commercial market. The second protocol uses &amp;#8220;rennet DNA extraction protocol&amp;#8221; combined with the DNA binding capacity of glass powder (glass milk), which can easily be &amp;#8220;home made&amp;#8221;. The first protocol is used when a high yield of DNA is needed, whereas the second protocol is used for...
Tipo: Journal article
Palavras-chave: Chymosin; DNA extraction; Glass milk; Rennet; Rennin; Silica.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200011

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

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

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

PCR assembly of synthetic human erythropoietin gene
Provedor de dados: 69
Autores: Bustami,Yazmin; Yahya,Ahmad Ramli Mohd; Muhammad,Tengku Sifzizul Tengku; Shu-Chien,Alexander Chong; Abdullah,Amirul Al-Ashraf; Noor,Mohd Azizan Mohd; Arip,Yahya Mat.
Human erythropoietin (huEPO) is a glycoprotein with important physiological functions, such as erythropoiesis, angiogenesis, and wound healing. A therapeutic protein, huEPO is commonly used to treat patients suffering from renal and non-renal anemia. Recombinant human erythropoietin (rhuEPO) and endogenous huEPO are similar with respect to their biological and chemical properties. In this study, we describe the construction of synthetic huEPO gene to produce rhuEPO. The synthetic huEPO gene was constructed by overlapping oligonucleotides assembly and amplified by polymerase chain reaction (PCR). Twenty oligonucleotide sets, covering the huEPO gene sequence and two newly introduced restriction enzyme sites, were pulled together and amplified using Pfu DNA...
Tipo: Journal article
Palavras-chave: Cloning; Erythropoietin; Oligonucleotide assembly.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300011

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

Postdoctoral Training in South America: Opportunities in Chile
Provedor de dados: 69
Autores: Sobrado,Pablo.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300016

Xylitol production and furfural consumption by a wild type Geotrichum sp.
Provedor de dados: 69
Autores: Silveira Rocha Matos,Ítalo Thiago; do Carmo,Edson Júnior; Nogueira de Assunção,Enedina; Alves de Almeida,Richardson; Makarem Soares,Verena; Astolfi Filho,Spartaco.
Background: Xylitol is a five carbons polyol with promising medical applications. It can be obtained from chemical D-xylose reduction or by microbial fermentation of Sugarcane Bagasse Hemicellulosic Hydrolysate. For this last process, some microbial inhibitors, as furfural, constitute severe bottleneck. In this case, the use of strains able to produce xylitol simultaneously to furfural neutralization is an interesting alternative. A wild-type strain of Geotrichum sp. was detected with this ability, and its performance in xylitol production and furfural consumption was evaluated. Furthermore, were analyzed its degradation products. Results: Geotrichum sp. produced xylitol from D-xylose fermentation with a yield of 0.44 g-g-1. Furfural was fully consumed in...
Tipo: Journal article
Palavras-chave: Detoxification Sugarcane bagasse hemicellulosic hydrolysate Xylitol; D-Xylose reduction D-Xylose fermentation Microbial fermentation Furfural Sugarcane bagasse Hemicellulosic hydrolysate.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600003

Effect of laundry detergent formulation on the performance of alkaline phytoproteases
Provedor de dados: 69
Autores: Barberis,Sonia; Quiroga,Evelina; Barcia,Cristina; Liggieri,Constanza.
Background: Proteases constitute the largest product segment in the global industrial enzymes market; they are used in food, pharmaceutical, leather, textile, wood and detergent industries. Alkaline proteases improve the cleaning efficiency of detergents and represent one of the most successful applications of modern industrial biotechnology. The aim of this work was to study the performance of two alkaline phytoproteases, araujiain (Araujia hortorum Fourn.) and asclepain (Asclepias curassavica L.), for their potential application as additive in laundry detergent formulations. Results: The effect of pure non-ionic and ionic surfactants on proteolytic activity of araujiain and asclepain was analyzed measuring the remaining activity after 1 hr of incubation...
Tipo: Journal article
Palavras-chave: Asclepain; Araujiain; Detergents formulations; Alkaline plant proteases.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300003

Recovery of lead and cadmium ions from metal-loaded biomass of wild cocoyam (Caladium bicolor) using acidic, basic and neutral eluent solutions
Provedor de dados: 69
Autores: Horsfall Jnr,Michael; Ogban,Fred E.; Akporhonor,Eyetemi E.
The effects of acidic, basic and neutral reagents on the recovery of Pb2+ and Cd2+ from metal-loaded biomass of wild cocoyam (C. bicolor) were investigated by eluting the biomass in five successive cycles using 0.01 M HCl, 0.1 M HCl, 0.01 M NaOH, 0.1 M NaOH and distilled water at different contact times. The data showed that the ease of metal ion recovery from metal -loaded biomass by the eluent solutions is of the order 0.01 M HCl &gt; 0.1 M HCl &gt; 0.01 M NaOH &gt; 0.1 M NaOH &gt; distilled water. Over 94% Pb2+ and 74% Cd2+ of the initially adsorbed metals were recovered by 0.01 M HCl, while &lt; 20% of both metals was recovered by basic reagent. Distilled water recovered less than 9% of both metal ions from the biomass. Macroscopic changes were also...
Tipo: Journal article
Palavras-chave: Cocoyam; Desorption; Heavy metals removal; Metal recovery; Water treatment.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200009

Methane hydrates in the Chilean continental margin
Provedor de dados: 69
Autores: Morales G.,Esteban.
In the coming years the worldwide energetic resources based on hydrocarbons will diminish, and methane hydrates can become an alternative source, given its huge deposits. Chile does not have great amounts of energetic resources; however, during the cruise C-2901 on board the R/V CONRAD in 1998, seismic profiles that took place in the Chilean continental margin between 35º and 45ºS show the presence of methane hydrates through BSR analysis. The following parameters for the hydrate layer can be assumed: Thickness = 100 m, Longitude E-W = 20 km, Latitude N-S = 1000 km, hydrate concentration in the sediments = 10%, and 160 m³ of gas per m³ of hydrate. With these figures, the volume of estimated gas is 3.2 x 10(13) m³.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200002

Microbial Diversity and Ecosystem Functions - the Unmined Riches
Provedor de dados: 69
Autores: Weinbauer,Markus G.; Wenderoth,Dirk F.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000100003

Immobilization of cyclodextrin glucanotransferase on aminopropyl-functionalized silica-coated superparamagnetic nanoparticles
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 glycosyltransferase (CGTase) from Amphibacillus sp. NPST-10 was successfully covalently immobilized on aminopropyl-functionalized silica coated superparamagnetic nanoparticles; and the properties of immobilized enzyme were investigated. The synthesis process included preparing of core magnetic magnetite (Fe3O4) nanoparticles using solvothermal synthesis; followed by coating of Fe3O4 nanoparticles with dense amino-functionalized silica (NH2-SiO2) layer using in situ functionalization method. The structure of synthesized Fe3O4@NH2-SiO2 nanoparticles was characterized using TEM, XRD, and FT-IR analysis. Fe3O4@NH2-SiO2 nanoparticles were further activated by gluteraaldehyde as bifunctional cross linker, and the activated nanoparticles...
Tipo: Journal article
Palavras-chave: Amphibacillus sp. NPST-10; Cyclodextrin glucanotransferase; Immobilization; Magnetic nanoparticle; Silica.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600010

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

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

The inhibitory effect of biofilms produced by wild bacterial isolates to the larval settlement of the fouling ascidia Ciona intestinalis and Pyura praeputialis
Provedor de dados: 69
Autores: Zapata,Manuel; Silva,Fernando; Luza,Yery; Wilkens,Marcela; Riquelme,Carlos.
Marine biofouling is a present and potentially increasing future problem at molluscan culture centres. The problem is highly variable, exists on different scales, and its negative impact on cultured organisms and related economic losses at these centres has not been significantly controlled. One approach to fouling control has been the incorporation of natural substances into anti-fouling paints which inhibit the settlement of common fouling organisms. The main objective of the present study was the isolation of naturally occurring substances from marine bacteria which were inhibitory to the settlement of Ciona intestinalis and Pyura praeputialis, two tunicate species causing serious fouling problems in scallop culture systems in Chile. Numerous bacterial...
Tipo: Journal article
Palavras-chave: Antifouling extracts; Ascidian bioassays; Bacterial biofilms; Ciona intestinalis; Marine biofouling; Natural antifoulants; Pyura praeputialis.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100014

Endogenous GUS-like activity in Capsicum chinense Jacq
Provedor de dados: 69
Autores: Solís-Ramos,Laura Yesenia; González-Estrada,Tomas; Andrade-Torres,Antonio; Godoy-Hernández,Gregorio; Castaño de la Serna,Enrique.
The gene uidA, codes for &amp;#946;-glucuronidase, which is one of the reporters more frequently utilized in transgenic plants. However, this can only be use if the selected organism does not present endogenous GUS-like activity. In tissues of C. chinense we found a GUS-like activity showing different levels of intensity. Histochemical screening showed that endogenous GUS-like activity decreased, or reduced significantly, in almost all tissues with exception of stament, when phosphate buffer was adjusted to pH 8. Subsequently, C. chinense zygotic embryo explants were transient transformed with Agrobacterium tumefaciens LBA4404 (pCAMBIA2301) and plantlets regenerated were histochemically stained in phosphate buffer pH 8. Observations of incubated tissues of...
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400002

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

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

Spirulina platensis growth estimation by pH determination at different cultivations conditions
Provedor de dados: 69
Autores: Pelizer,Lúcia Helena; Carvalho,J.C.M.; Sato,Sunao; de Oliveira Moraes,Iracema.
Spirulina platensis is a cyanobacterium that has a high protein content and therefore, a high nutritional value. It can be cultivated either in a liquid or in a solid culture. When cultivated in aqueous culture the cell growth can be determined by following the optical density. On the other hand, when produced by solid cultivation the growth can be determined only indirectly, such as, through determination of the protein content of the fermenting solids. In this work the possibility of estimating cell growth by pH determination was verified. From the results it was concluded that pH and protein production (solid or surface culture) or cell content (liquid culture) correlate well, therefore pH determination seems to be a good method to determine cell growth.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300009

Improvement of SCP production and BOD removal of whey with mixed yeast culture
Provedor de dados: 69
Autores: Moeini,Hassan; Nahvi,Iraj; Tavassoli,Manoochehr.
This research emphasizes on single cell protein (SCP) production and Biochemical Oxygen Demand (BOD) removal from whey with mixed yeast culture. For this purpose, 11 yeast strains were isolated from dairy products (M1-M11) and the strains were identified by morphological and physiological properties. These yeast strains were tested for their ability to reduce the BOD and to produce SCP from whey. Among these strains, K. lactis (M2) had the most SCP production from whey with the yield of 11.79 g/l. Ammonium sulphate as nitrogen source had an increasing effect on biomass yield. The mixed culture of the isolated yeast strains with Saccharomyces cerevisiae was used in order to increase the biomass yield and BOD removal. The highest biomass yield (22.38 g/l)...
Tipo: Journal article
Palavras-chave: Beta-galactosidase; BOD; Candida versatilis; Kluyveromyces lactis; Kluyveromyces marxianus; Mixed culture; SCP; Whey.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300006

Simple method to prepare DNA templates from a slice of peanut cotyledonary tissue for Polymerase Chain Reaction
Provedor de dados: 69
Autores: Yu,Shu Tao; Wang,Chuan Tang; Yu,Shan Lin; Wang,Xiu Zhen; Tang,Yue Yi; Chen,Dian Xu; Zhang,Jian Cheng.
An efficient DNA extraction method was developed for peanut seed, where only 3-5 mg cotyledonary tissue was enough for more than 50 PCR reactions with a reaction volume of 15 &amp;#956;l. Both low copy number and high copy number DNA sequences were successfully amplified. Processing one seed sample only took about half an hour. Sampling had no significant effects on germination and development. The DNA extraction method makes it possible to identify transformants and conduct molecular marker studies prior to sowing, and thus may greatly hasten research progress.
Tipo: Journal article
Palavras-chave: Cotyledonary tissue; DNA extraction; Groundnut; PCR; Peanut.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000400012

Selection of polyvalent bacteriophages infecting Salmonella entérica serovar Choleraesuis
Provedor de dados: 69
Autores: Parra,Bárbara; Robeson,James.
Background: Ideally, bacteriophages of pathogenic bacterial hosts should be polyvalent to be able to replicate in an alternative nonpathogenic bacterium. Thus, accidental infection by the original host can be avoided when bacteriophage lysates are used in biocontrol protocols. Results: From 15 wastewater samples, collected at different sites in the V Region in Chile, we selected three bacteriophages (FC, FP, and FQ) capable of productively infecting Salmonella enterica serovar Choleraesuis. By transmission electron microscopy (TEM) observation, the bacteriophages were found to belong to the order Caudoviridae. Molecular analyses indicated that FC, FP, and FQ contained double-stranded DNA genomes, of sizes similar to bacteriophage P22, and distinct...
Tipo: Journal article
Palavras-chave: Bacteriophage; Polyvalent; Salmonella enterica serovar Choleraesuis.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300011

Transfer and expression of the genes of Bacillus branched chain alpha-oxo acid decarboxylase in Lycopersicun esculentum
Provedor de dados: 69
Autores: Wang-Pruski,Gefu; Szalay,Aladar A.
Engineering of higher plants for increased cold tolerance requires a chemical modification of membrane fluidity in both organelles and cytoplasm of plant cells. A small number of microorganisms use branched chain fatty acids as their membrane constituents to maintain membrane fluidity, instead of unsaturated fatty acids. One of the key enzymes facilitating synthesis of branched chain fatty acids in Bacillus subtilis 168s is the branched chain alpha-oxo acid decarboxylase. To examine the role of branched chain fatty acids in plants and the potential for low temperature tolerance, the A and B genes encoding the alpha and beta polypeptides, respectively, of the branched chain alpha-oxo acid decarboxylase were introduced into the genome of tomato plants. The...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200009

Glucose and other hexoses transporters in marine invertebrates: A mini review
Provedor de dados: 69
Autores: Martínez-Quintana,José Alfredo; Yepiz-Plascencia,Gloria.
Glucose and related hexoses are very important metabolic substrates. Their most important function is to provide quick fuel for most organisms in all three kingdoms because they are the first substrate for energy production in the form of ATP through glycolysis and the subsequent metabolic pathways. In this paper we review the current information about how glucose and related hexoses are transported across biological membranes to carry out their function either as a metabolic molecule or as energy store in marine invertebrate organisms. In these animals, there are two sugar transport systems that are mediated by the sodium/solute symporter family proteins (SGLT) and the major facilitative super-family proteins (GLUT). The most studied sugar transporters in...
Tipo: Journal article
Palavras-chave: Facilitative; GLUT; SGLT; Sodium-dependent; Transport.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500016

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

RAPD analysis of seized marijuana (Cannabis sativa L.) in Turkey
Provedor de dados: 69
Autores: Pinarkara,Emine; Kayis,Seyit A; Hakki,Erdogan E; Sag,Ayla.
Cannabis sativa L. is a multiple-use plant. However, its cultivation is strictly controlled due to its psychoactive nature and usage in producing drugs such as marijuana, and hashish. In this study, psychoactive type Cannabis samples, which were seized from 29 different locations of Turkey, were used. Interests were to identify the genetic relatedness of the seized samples and to partition molecular variance between and within populations. Randomly Amplified Polymorphic DNAs were employed for analysis based on single plant material and bulked samples of them. Data were analysed via cluster and principal coordinate analyses (PCoA). Analysis of molecular variance (AMOVA) was performed to obtain variations between and within populations. Cannabis accessions...
Tipo: Journal article
Palavras-chave: AMOVA; Cluster analysis; Individualization of seized marijuana; Principle coordinate analysis; Randomly amplified polymorphic DNA; UPGMA.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000100005

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

Sheep 7SK promoter for short hairpin RNA expression
Provedor de dados: 69
Autores: Ni,Wei; Hu,Shengwei; Hazi,Wureli; Wang,Yuanzhi; Qiao,Jun; Yan,Ren; Chen,Chuangfu.
Background: Gene silencing mediated by small interfering RNA (siRNA) has become a powerful biological tool for the regulation of gene expression. For the synthesis of siRNA by vector-based expression systems, several mammalian small nuclear RNA (snRNA) promoters have been cloned and shown different transcriptional efficiencies. Results: In this study, we identified a sheep 7SK snRNA (s7SK) promoter based on the highly conserved polymerase III promoter elements. Promoter activity was measured by promoter-driven shRNA expression to suppress expression of an exogenous reporter gene and endogenous sheep gene. Conclusions: The knock down assay demonstrated that the s7SK induced more stronger inhibition effect than human U6 and H1 promoters. The use of this...
Tipo: Journal article
Palavras-chave: 7SK promoter; RNAi; Sheep; ShRNA.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200010

Scavenging of nickel and chromium toxicity in Aulosira fertilissima by immobilization:: Effect on nitrogen assimilating enzymes
Provedor de dados: 69
Autores: Banerjee,Meenakshi; Mishra,Shanoo; Chatterjee,Jhuma.
The ubiquity of heavy metals in the biosphere results in the introduction of high amounts of toxic metals into the food chain from various sources. In the present study, one of the strongest nitrogen fixing cyanobacterium of the rice fields, Aulosira fertilissima, was subjected to nickel and chromium stress and the ameliorating effect of immobilization was investigated. Cell immobilization could protect the organism&amp;rsquo;s growth against the toxicity of both heavy metals at LC50 as compared to lethal concentrations. The nitrate reductase activity in free cells treated with the metals was substantially inhibited but immobilized cells treated with 0.1 ppm nickel was not affected by the metal treatment. Cell immobilization also resulted in a significant...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300013

Peroxidase production from hairy root cultures of red beet (Beta vulgaris)
Provedor de dados: 69
Autores: Rudrappa,Thimmaraju; Neelwarne,Bhagyalakshmi; Kumar,Vinod; Lakshmanan,Venkatachalam; Venkataramareddy,Sreedhar Reddampalli; Aswathanarayana,Ravishankar Gokare.
The genetically transformed roots of red beet have been shown, for the first time, to produce very high levels of peroxidase (POD; EC 1.11.1.7) accounting for 1.21 x 10(6) Units L-1. Of the ten clones established using different strains of Agrobacterium rhizogenes, one was that from the strain LMG-150, three each from A 2/83, A 20/83 and A4. All the clones showed true integration of T-DNA when tested by PCR and Southern hybridization methods. Each clone differed significantly from the others in growth, hormone dependency and POD production where LMG-150 produced highest biomass (140 g FW L-1) as well as POD (ranging from 8000-9000 U g-1 FW and 1.18 x 10(6) U L-1 with a specific activity of 600 U mg-1 protein) on hormone-free medium, both in shake-flask as...
Tipo: Journal article
Palavras-chave: Agrobacterium rhizogenes; Auxins; Elicitation; T-DNA; Thermostability; Transformation.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200008

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

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

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

Metabolic engineering: Use of system-level approaches and application to fuel production in Escherichia coli
Provedor de dados: 69
Autores: Gonzalez,Ramon.
Metabolic engineering was formally defined more than two decades ago (Bailey, 1991) and it is now an established discipline. Metabolic engineering is generally defined as the directed improvement of product formation or cellular properties through the modification of specific biochemical reactions or the introduction of new ones with the use of recombinant DNA technology (Bailey, 1991; Stephanopoulos et al. 1998). Therefore, the analysis and engineering/synthesis of metabolic pathways is of central importance to metabolic engineering. The analytical part uses a number of experimental and modeling techniques for the systematic study of cellular responses (in terms of RNA, protein and metabolite levels, metabolic fluxes, etc.) to genetic and environmental...
Tipo: Journal article
Palavras-chave: Biofuels; Escherichia coli; Metabolic engineering; Systems biology.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300017

Whey upgrading by enzyme biocatalysis
Provedor de dados: 69
Autores: Illanes,Andrés.
Whey is a co-product of processes for the production of cheese and casein that retains most of the lactose content in milk. World production of whey is estimated around 200 million tons per year with an increase rate of about 2%/per year. Milk production is seasonal, so surplus whey is unavoidable. Traditionally, whey producers have considered it as a nuisance and strategies of whey handling have been mostly oriented to their more convenient disposal. This vision has been steadily evolving because of the upgrading potential of whey major components (lactose and whey proteins), but also because of more stringent regulations of waste disposal. Only the big cheese manufacturing companies are in the position of implementing technologies for their recovery and...
Tipo: Journal article
Palavras-chave: Beta-galactosidase; Enzyme catalysis; Lactose; Oligosaccharides; Prebiotics; Whey.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600009

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

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

Micropropagation of Lilium ledebourii (Baker) Boiss as affected by plant growth regulator, sucrose concentration, harvesting season and cold treatments
Provedor de dados: 69
Autores: Azadi,Pejman; Khosh-Khui,Morteza.
A protocol for the micropropagation in different harvesting time of Lilium ledebourii (Baker) Boiss, an endangered rare species endemic to Iran has been developed. In vitro scale culture of this species, using bulbs from three harvesting seasons (spring, summer and winter), was attempted. Among the various treatments tested, the Murashige and Skoog (MS) medium supplemented with 0.1 mg l-1 naphthaleneacetic acid (NAA) + 0.1 mg l-1 benzyladenin (BA) and 6% sucrose in all harvesting seasons proved to be superior to others. The best results for fresh weight of bulblets, rooting parameters and the survival rate after transplantation to greenhouse were obtained from early winter-harvested bulbs. Summer-harvested bulbs had the highest number of bulblets per...
Tipo: Journal article
Palavras-chave: Bulblet; Cold treatment; Conservation; Harvesting season; Lilium ledebourii; Tissue culture.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400011

Taking a lead in applied mining biotechnology
Provedor de dados: 69
Autores: Badilla-Ohlbaum,Ricardo.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200001

The exopolysaccharides biosynthesis by Candida yeast depends on carbon sources
Provedor de dados: 69
Autores: Gientka,Iwona; Bzducha-Wróbel,Anna; Stasiak-Rózañska,Lidia; Agnieszka Bednarska,Aleksandra; Blazejak,Stanislaw.
Background: The exopolysaccharides (EPS) produced by yeast exhibit physico-chemical and rheological properties, which are useful in the production of food and in the cosmetic and pharmaceutical industries as well. The effect was investigated of selected carbon sources on the biosynthesis of EPS by Candida famata and Candida guilliermondii strains originally isolated from kefirs. Results: The biomass yields were dependent on carbon source (sucrose, maltose, lactose, glycerol, sorbitol) and ranged from 4.13 to 7.15 g/L. The highest biomass yield was reported for C. guilliermondii after cultivation on maltose. The maximum specific productivity of EPS during cultivation on maltose was 0.505 and 0.321 for C. guilliermondii and C. famata, respectively. The...
Tipo: Journal article
Palavras-chave: Candida; Exopolysaccharides biosynthesis; EPS; Maltose.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400005

The potential use of anoxygenic phototrophic bacteria for treating latex rubber sheet wastewater
Provedor de dados: 69
Autores: Kantachote,Duangporn; Torpee,Salwa; Umsakul,Kamontam.
A total of 92 isolates of the purple non sulphur photosynthetic bacteria (PNSB) were isolated from 23 samples of wastewater obtained from rubber sheet manufacturing processes from various places of southern, Thailand. The isolate DK6 had the best potential for use in wastewater treatment as it can out-compete indigenous strains of PNSB when grown with them under conditions of microaerobic-light conditions. The isolate DK6 was identified as being most closely allied to Rhodopseudomonas blastica. The optimal pH and temperature for cell growth were between 6.5-7.5 and 30&amp;ordm;C, respectively. Optimum growth of DK6 was obtained after supplementing the wastewater from a latex rubber sheet processing plant with 0.50% (NH4)2SO4 and 1 mg/L nicotinic acid under...
Tipo: Journal article
Palavras-chave: Biochemical oxygen demand(BOD); Chemical oxygen demand(COD); Purple non sulphur photosynthetic bacteria (PNSB); Rubber sheet wastewater; Single cell protein (SCP).
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000300012

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

Oligomerization of Cry9Aa in solution without receptor binding, is not related with insecticidal activity
Provedor de dados: 69
Autores: Fang,Longfa; Wang,Bo; Zhou,Zishan; Yang,Sujuan; Shu,Changlong; Song,Fuping; Bravo,Alejandra; Soberón,Mario; Zhang,Jie.
Background: Bacillus thuringiensis Cry toxins bind with different insect midgut proteins leading to toxin oligomerization, membrane insertion and pore formation. However, different Cry toxins had been shown to readily form high molecular weight oligomers or aggregates in solution in the absence of receptor interaction. The role of Cry oligomers formed in solution remains uncertain. The Cry9A proteins show high toxicity against different Lepidoptera, and no-cross resistance with Cry1A. Results: Cry9Aa655 protein formed oligomers easily in solution mediated by disulfide bonds, according to SDS-PAGE analysis under non-reducing and reducing conditions. However, oligomerization is not observed if Cry9Aa655 is activated with trypsin, suggesting that cysteine...
Tipo: Journal article
Palavras-chave: Cry9Aa655; Disulfide bonds; Oligomerization; Insecticidal activity.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300006

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

The Colours of Biotechnology: Science, Development and Humankind
Provedor de dados: 69
Autores: DaSilva,Edgar J.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300001

Phylogenetic relationships among species of the subsection Dendrophlomis Bentham
Provedor de dados: 69
Autores: Yuzbasioglu,Ertugrul; Dadandi,Mehmet Yasar.
This study used randomly amplified polymorphic DNA markers to determine genetic relationships among species of the subsection Dendrophlomis. Twenty accessions of the eleven Phlomis taxa were evaluated to determine genetic variability using fourteen ten mer primers selected from a 125 random oligonucleotide set. These 14 selected primers generated 85 RAPD bands that ranged in size from 200 to 1200 base pairs. Of the total bands, 88% (75) were polymorphic among the samples. Genetic distances among accessions were computed to produce a dendrogram based on UPGMA. Genetic distances ranged from 0.133 (between P. amanica and P. monocephala) to 0.494 (between P. chimerae and P. lunariifolia). The UPGMA tree based on distances has two major groups. The first...
Tipo: Journal article
Palavras-chave: Genetic diversity; Genetic relationships; Genetic variation; Phlomis species; RAPDs.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400012

Identification of unknown genetically modified material admixed in conventional cotton seed and development of an event-specific detection method
Provedor de dados: 69
Autores: Akritidis,Paschalis; Pasentsis,Konstantinos; Tsaftaris,Athanasios S; Mylona,Photini V; Polidoros,Alexios N.
Entering the second decade of commercialization of biotech crops, the global area cultivated with transgenic plants constantly expands and national legislations in many countries, particularly in the European Union, require identification and labeling of genetically modified material in food and feed. We describe here a procedure for characterizing transgenic material of unknown origin present in conventional seed lots using a genome walking strategy for isolation and characterization of the junction between the inserted transgene construct and the host plant genomic DNA. The procedure was applied to transgenic cotton detected as adventitious or technically unavoidable presence in a conventional commercial cultivar. The structure of the isolated region...
Tipo: Journal article
Palavras-chave: Event specific detection; Genetically modified cotton; Genome walking; GMO detection; Mon1445.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200010

Induction of the expression of defence genes in Carica papaya fruit by methyl jasmonate and low temperature treatments
Provedor de dados: 69
Autores: Rivera-Domínguez,Marisela; Astorga-Cienfuegos,Karen Rosalinda; Tiznado-Hernández,Martin Ernesto; González-Aguilar,Gustavo Adolfo.
The defence mechanisms that are activated by methyl jasmonate (MJ) in fruits are not well understood. In this work, we studied the expression of defence genes in papaya fruit that are induced by the exposure to MJ and/or low temperatures. The papaya fruits &amp;#145;Maradol&amp;#146; were randomly divided into two groups: one group was the untreated control and the other was treated with 10-4 M of MJ. Half of the fruits from each of the two groups were stored after treatment for 5 days at 5ºC and 2 days at 20ºC. We studied the expression levels of the pdf1.1 and pdf1.2 genes by amplification from expression libraries created from the pulp and skin tissues of the papaya fruit. As a reference, the mRNA level of the 18s ribosomal gene was used. In the skin...
Tipo: Journal article
Palavras-chave: Cold treatment; Defence proteins; Genetic expression; Jasmonic acid methyl ester; Papaya fruit.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500006

Peptide synthesis: chemical or enzymatic
Provedor de dados: 69
Autores: Guzmán,Fanny; Barberis,Sonia; Illanes,Andrés.
Peptides are molecules of paramount importance in the fields of health care and nutrition. Several technologies for their production are now available, among which chemical and enzymatic synthesis are especially relevant. The present review pretends to establish a non-biased appreciation of the advantages, potentials, drawbacks and limitations of both technologies. Chemical synthesis is thoroughly reviewed and their potentials and limitations assessed, focusing on the different strategies and challenges for large-scale synthesis. Then, the enzymatic synthesis of peptides with proteolytic enzymes is reviewed considering medium, biocatalyst and substrate engineering, and recent advances and challenges in the field are analyzed. Even though chemical synthesis...
Tipo: Journal article
Palavras-chave: Enzymatic synthesis; Peptides; Proteases; Solid-phase synthesis.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200012

Potential use of Lactobacillus casei TISTR 1500 for the bioconversion from palmyra sap and oil palm sap to lactic acid
Provedor de dados: 69
Autores: Chooklin,Supasit; Kaewsichan,Lupong; Kaewsrichan,Jasadee.
Lactic acid is a product that finds several applications in food, cosmetic, pharmaceutical and chemical industries. The main objective of this work is to evaluate potential use of the sap from palmyra (Borassus flabellifer Linn.) and oil palm (Elaeis guineensis) as substrate for lactic acid production by Lactobacillus casei TISTR 1500. The effects of acid hydrolysis, pH control and nutrient supplement of palmyra sap and oil palm sap on fermentation performance were investigated. It was found that lactic acid fermentation using palmyra sap was not significantly affected by either acid hydrolysis or pH control. The addition of MRS increased biomass and product yield. The final lactic acid concentration, dry cell weight and productivity were increased by...
Tipo: Journal article
Palavras-chave: Fermentation; Lactic acid; Lactobacillus casei TISTR 1500; Oil palm sap; Palmyra sap.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500010

Genetic diversity analysis of Bemisia tabaci populations in Pakistan using RAPD markers
Provedor de dados: 69
Autores: Hameed,Saima; Hameed,Shahid; Sadia,Munazza; Malik,Salman A.
Background: The Bemisia tabaci is one of the most devastating pests of agricultural crops and ornamental plants worldwide. The genetic diversity and biotype status of the Bemisia tabaci in Pakistan was assessed by using random amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR). A total 80 samples of B. tabaci collected from 14 districts of the Punjab province and 7 districts of the Sindh province were included. Results: All 10 primers screened in this study generated 151 scorable amplification products, of which 117 or 77% were polymorphic. Pairwise Nei and Li’s similarity had ranged from 0.25 to 0.88 among all individuals analyzed. Based on Nei and Li’s similarity coefficients Bemisia populations were grouped into 3 main clusters and clearly...
Tipo: Journal article
Palavras-chave: Asia II 1; Genetic diversity; UPGMA; Whitefly.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600006

Production and stability studies of the bioemulsifier obtained from a new strain of Candida glabrata UCP 1002
Provedor de dados: 69
Autores: Asfora Sarubbo,Leonie; Moura de Luna,Juliana; de Campos-Takaki,Galba Maria.
Evaluation of both tenso-active and emulsifying activities indicated that a biosurfactant was produced by the newly isolated and promising strain Candida glabrata isolated from mangrove sediments. The extracellular water-soluble emulsifying agent was isolated and identified as a heteropolymer. The maximum of bioemulsifier production was observed when the strain was grown on soluble and insoluble substrates cotton seed oil plus glucose, reaching values of 10.0 g/l after 144 hrs at 200 rpm. The cell-free culture broth containing the examined agent lowered the surface tension of the medium to 31 mN/m. Stable and compact emulsions with emulsifying activity of 75% of cotton seed oil were detected. The emulsification capacity remained practically unaltered...
Tipo: Journal article
Palavras-chave: Biosurfactant; Candida; Emulsifier; Fermentation; Glucose; Vegetal oil.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400008

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

The potential use of lipases in the production of fatty acid derivatives for the food and nutraceutical industries
Provedor de dados: 69
Autores: Ferreira-Dias,Suzana; Sandoval,Georgina; Plou,Francisco; Valero,Francisco.
The potential of lipases (E.C.3.1.1.3.) as biocatalysts for the production of fatty acid derivatives for the food and nutraceutical industries, such as flavouring esters, fatty acid esters of antioxidants and structured lipids, is enormous, mainly due to their high regio- and stereo-selectivities, in addition to the other well-known advantages of enzymatic processes. The replacement of chemical catalysts by lipases presents great benefits in terms of the nutritional properties of the obtained products and environmental care. The reactions performed for the production of these compounds, as well as the best operation conditions, the biocatalysts used, reactor types and operation mode, are addressed in this review.
Tipo: Journal article
Palavras-chave: Fatty acids derivatives; Lipases; Nutraceutical industries.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300012

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

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

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

Kinetic study on inducibility of polygalacturonases from Aspergillus flavipes FP-500
Provedor de dados: 69
Autores: Martínez-Trujillo,Aurora; Aranda,Juan S; Aguilar-Osorio,Guillermo.
The aim of this work was to describe growth dynamics, substrate depletion and polygalacturonases production by Aspergillus flavipes FP-500 in batch cultures by means of unstructured models. The microorganism was cultivated on several mono- di- and poly- saccharides, and then the culture development modeled with Monod and Leudeking-Piret equations. The kinetic parameters related to the models (µmax, &amp;#947;x/s, &amp;#945; and &amp;#946;) were obtained by minimizing the quadratic residuals function with a simplex algorithm. An accurate description of experimental data was attained with the proposed models. Besides, modeling provided significant kinetic information on microbial degradation of complex substrates, such as the correlation between specific...
Tipo: Journal article
Palavras-chave: Constitutive enzymes; Inducible enzymes; Initial pH; Kinetic modeling; Pectinases.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400008

Optimization of polyethylenimine-mediated transient transfection using response surface methodology design
Provedor de dados: 69
Autores: Fang,Qiangyi; Shen,Bingqian.
Response surface methodology was undertaken to optimize the polyethylenimine-mediated transient transfection of suspension cultured HEK 293-F cells. A total of 15 combinations were designed according to Box-Behnken design to identify the effects of DNA concentration, polyethylenimine concentration and incubation time on transient transfection efficiency. The highest integral optic density of green fluorescent protein presenting r-protein yield was accessed using a DNA concentration of 1.75 µg/mL, a polyethylenimine concentration of 10.5 µg/mL, and an incubation time of 11.8 min. Analysis of variance demonstrated that the experimental values fit well with a quadratic model. The RSM-optimized transient transfection resulted in greater production of human...
Tipo: Journal article
Palavras-chave: Bioreactor; Human tissue kallikrein; Transient gene expression.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500010

Optimisation of the solids suspension conditions in a continuous stirred tank reactor for the biooxidation of refractory gold concentrates
Provedor de dados: 69
Autores: González,Ramón; Gentina,Juan C.; Acevedo,Fernando.
The large-scale biooxidation of gold concentrates is usually carried on in continuous stirred tank reactors (CSTR). Attaining homogeneous slurries is a difficult task, as solids tend to stratify in the tank. The objective of this work was to determine the optimal conditions of agitation in a CSTR so to obtain the best solids suspension. The experiments were performed in a 5 litre glass tank operated with 3 litres of 6% w/v slurry. The impellers (pitched blade turbine or marine propeller) were placed at heights of 6.7 to 13.4 cm from the bottom and operated at 370 to 1040 rpm, with specific aeration rates of 0.3 to 3.7 vvm. A statistical experimental design was used which allowed the derivation of a model representing response surfaces of the exit and mean...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300008

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

User-friendly optimization approach of fed-batch fermentation conditions for the production of iturin A using artificial neural networks and support vector machine
Provedor de dados: 69
Autores: Chen,Fudi; Li,Hao; Xu,Zhihan; Hou,Shixia; Yang,Dazuo.
Background In the field of microbial fermentation technology, how to optimize the fermentation conditions is of great crucial for practical applications. Here, we use artificial neural networks (ANNs) and support vector machine (SVM) to offer a series of effective optimization methods for the production of iturin A. The concentration levels of asparagine (Asn), glutamic acid (Glu) and proline (Pro) (mg/L) were set as independent variables, while the iturin A titer (U/mL) was set as dependent variable. General regression neural network (GRNN), multilayer feed-forward neural networks (MLFNs) and the SVM were developed. Comparisons were made among different ANNs and the SVM. Results The GRNN has the lowest RMS error (457.88) and the shortest training time (1...
Tipo: Journal article
Palavras-chave: Artificial neural network; Fed-batch fermentation; General regression neural network; Iturin A; Support vector machine.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400003

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

Evaluation of two bioadsorbents for removing paracetamol from aqueous media
Provedor de dados: 69
Autores: Flores Nardy Ribeiro,Araceli Verónica; Belisário,Marciela; Moretto Galazzi,Rodrigo; Cazoni Balthazar,Daniele; Godoi Pereira,Madson de; Nardy Ribeiro,Joselito.
The frequent contamination of water resources with drugs comprises one the most important environmental problems. In order to avoid serious disturbances for aquatic life, efficient and economically viable procedures should be developed for removing common pollutants, as paracetamol. From these considerations, the present work evaluated the efficiency of sugar cane bagasse (SCB) and vegetable sponge (VS), two natural adsorbents commonly found in Brazil, for retaining paracetamol molecules dispersed in aqueous solutions. Thus, systems composed of glass columns and peristaltic pumps were optimized and, for pH, the best value was 7.0. After optimisation, adsorption isotherms were built and it was possible to calculate the MAC F values for SCB (120.5 µg/g) and...
Tipo: Journal article
Palavras-chave: Adsorption; Bioadsorbent; Paracetamol; Water.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600007

Novel technique for microbial production of 3,4-Dihydroxy Phenyl L-alanine by a mutant strain of Aspergillus oryzae
Provedor de dados: 69
Autores: Ali,Sikander; ul-Haq,Ikram; Qadeer,M.A.
L-DOPA is a useful drug for Parkinson’s disease. This investigation deals with the biosynthesis of L-DOPA by parental (GCB-6) and mutant (UV-7) strains of Aspergillus oryzae. There was a marked difference between the mycelial morphology and pellet type of the parental and UV-irradiated mutant cultures. The mutant strain of Aspergillus oryzae UV-6 showed pellet-like mycelial morphology and improved tyrosinase activity. Mould mycelium was used for biochemical conversion of L-tyrosine to L-DOPA since tyrosinase is an intracellular enzyme. The mutant was found to give 3.72 folds higher production of L-DOPA than the parental strain. The comparison of kinetic parameters was also done which showed greater ability of the mutant to yield L-DOPA (i.e. Yp/x 32.73...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200006

NaCl effects in Zea mays L. x Tripsacum dactyloides (L.) L. hybrid calli and plants
Provedor de dados: 69
Autores: Pesqueira,Julieta; García,Maria Dina; Staltari,Sebastian; Molina,Maria del Carmen.
High salt concentrations in soils negatively affect maize growth. Techniques such as remote hybridization and in vitro selection have been extensively used to accelerate breeding processes. In order to determine the usefulness of Tripsacum to improve salt tolerance in maize, the effects of NaCl, in vitro and in vivo, were evaluated in an intergeneric hybrid (MT) obtained from crossing Zea mays with Tripsacum dactyloides. Organogenic calli, induced from immature MT hybrid embryos, were exposed to different NaCl concentrations and the survival and regeneration percentages were calculated. Plants of the MT hybrid, obtained from the organogenic calli, were exposed to NaCl concentrations considered harmful for maize. The shoot dry weights of plants exposed to...
Tipo: Journal article
Palavras-chave: Intergeneric hybrid; Plant regeneration; Organogenesis; Salinity tolerance.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300022

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

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

Prolyl endopeptidase - Optimization of medium and culture conditions for enhanced production by Lactobacillus acidophilus
Provedor de dados: 69
Autores: Brzozowski,Bartosz; Lewandowska,Malgorzata.
Background Lactic acid bacteria are able to reduce the immunoreactivity of proteins of cereal grains during wheat dough fermentation or may be a source of proteolytic preparations added during bread making. The key enzyme in prolamin degradation is prolyl endopeptidase. This study was aimed at optimizing the composition of a culture medium and culture conditions that would enhance the synthesis of intracellular prolyl endopeptidase (PEP) by Lactobacillus acidophilus 5e2. Results The application of Plackett-Burman screening plans enabled demonstrating that the concentration of a nitrogen source in the culture and the initial pH value of the culture medium were significant for PEP synthesis. Further optimization conducted with the method of central composite...
Tipo: Journal article
Palavras-chave: Central composite design; Plackett-Burman design; Response surface methodology.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500003

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

Plant-antivenom: Database of anti-venom medicinal plants
Provedor de dados: 69
Autores: Amui,Saulo França; Puga,Renato David; Soares,Andreimar Martins; Giuliatti,Silvana.
Plant-antivenom is a computational Websystem about medicinal plants with anti-venom properties. The system consists of a database of these plants, including scientific publications on this subject and amino acid sequences of active principles from venomous animals. The system relates these data allowing their integration through different search applications. For the development of the system, the first surveys were conducted in scientific literature, allowing the creation of a publication database in a library for reading and user interaction. Then, classes of categories were created, allowing the use of tags and the organization of content. This database on medicinal plants has information such as family, species, isolated compounds, activity, inhibited...
Tipo: Journal article
Palavras-chave: Animal venoms; Natural plant inhibitors; Web system.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100006

Isolation of high-quality RNA from Platycladus orientalis and other Cupressaceae plants
Provedor de dados: 69
Autores: Chang,Ermei; Zhao,Yuxin; Wei,Qianchun; Shi,Shengqing; Jiang,Zeping.
Platycladus orientalis has a lifespan of several thousand years in China, making it a good plant in which to study aging at the molecular level, but this requires sufficient quantities of high-quality P. orientalis RNA. However, no appropriate methods have been reported for total RNA isolation from P. orientalis leaves. The TRIzol method did not extract RNA, while cetyltrimethylammonium bromide, sodium dodecyl sulfate-phenol, and plant RNAout kit (Tianz, Inc., China) protocols resulted in low yields of poor quality RNA. Isolating total RNA using the Spectrum™ Plant Total RNA Kit (Sigma-Aldrich, St. Louis, MO, USA) resulted in a high-quality product but a low yield. However, the two-step removal of polyphenols and polysaccharides in the improved plant...
Tipo: Journal article
Palavras-chave: Cupressaceae plants; Polysaccharides; Polyphenols; Total RNA isolation; Two-step removal of polyphenols and polysaccharides.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500004

Inhibition of shrimp pathogenic vibrios by extracellular compounds from a proteolytic bacterium Pseudomonas sp. W3
Provedor de dados: 69
Autores: Rattanachuay,Pattamarat; Kantachote,Duangporn; Tantirungkij,Manee; Nitoda,Teruhiko; Kanzaki,Hiroshi.
Pseudomonas sp. W3, a bacterium known to produce an extracellular alkaline protease, secreted secondary metabolites that inhibited pathogenic bacteria responsible for shrimp luminous vibriosis disease. Antivibrio compounds in the culture supernatant or culture filtrates (0.45 µm and 0.22 µm) of the isolate W3 were tested using an agar well diffusion method on a number of pathogenic vibrios. Vibrio harveyi PSU 2015 a pathogenic isolate was the most sensitive strain. The effectiveness of preparations from the isolate W3 against V. harveyi PSU 2015, and V. cholerae PSSCMI 0062 was in the order of culture supernatant &gt; 0.45 µm culture filtrate &gt; 0.22 µm culture filtrate. These extracellular antivibrio compounds also lysed both dead and living cells of V....
Tipo: Journal article
Palavras-chave: Bacteriolytic enzymes; Bioactive compounds; Pseudomonas sp. W3; Shrimp pathogenic bacteria; Vibrio spp.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100008

Using Bcl-xL anti-apoptotic protein for altering target cell apoptosis
Provedor de dados: 69
Autores: Iz,Sultan Gülçe; Çalimlioglu,Beste; Gürhan,Saime Ismet Deliloglu.
Background: Altering target cell apoptosis is one of the challenging ideas of biotechnological applications. There are several applications of over expressing Bcl-xL anti-apoptotic protein from recombinant protein production to DNA vaccination strategies. The aim of the present study is to evaluate the anti-apoptotic efficacy of Bcl-xL expressing dual promoter plasmid system as a candidate to be used for recombinant protein production and DNA vaccination approaches. For this purpose, Bcl-xL anti-apoptotic protein gene was inserted in a dual expressing vector system in frame with EGFP (enhanced green fluorescence protein) after IRES (internal ribosomal site). The plasmid has a multiple cloning site after CMV (cytomegalovirus promoter) left empty to be...
Tipo: Journal article
Palavras-chave: Animal cell biotechnology; Apoptosis; Bcl-xL anti-apoptotic protein.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500002

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

Protein interactions in enzymatic processes in textiles
Provedor de dados: 69
Autores: Tzanov,Tzanko; Andreaus,Jürgen; Guebitz,Georg; Cavaco-Paulo,Artur.
Enzymes are the catalysts of all reactions in living systems. These reactions are catalysed in the active sites of globular proteins. The proteins are composed by amino acids with a variety of side chains ranging from non-polar aliphatic and aromatic to acidic, basic and neutral polar. This fact allows to a globular 3D protein to create in the active site all ranges of microenvironments for catalysis. Major advances in microbial technology and genetics allow recently the broad range of enzymatic applications in the industry. Enzymatic processes have been increasingly incorporated in textiles over the last years. Cotton, wool, flax or starches are natural materials used in textiles that can be processed with enzymes. Enzymes have been used for desizing,...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300013

Normalization of elevated liver enzymes due to V-1 Immunitor therapy
Provedor de dados: 69
Autores: Jirathitikal,Vichai; Metadilogkul,Orapun; Bourinbaiar,Aldar S.
V-1 Immunitor (V1) is an oral AIDS vaccine currently being used as a therapeutic modality by HIV-positive patients. Upon interim analysis of phase I safety trial it has been discovered that patients who had elevated liver enzymes aspartate (AST/SGOT) and alanine (ALT/SGPT) aminotransferases have experienced the reduction of enzyme levels back to normal. Two other hepatitis markers alkaline phosphatase and bilirubin have also decreased. V1’s effect may be hepatitis-specific since liver enzymes in normal patients treated with V1 have not changed and three patients who were Hepatitis B antigen positive at baseline became negative after therapy. The results suggest that V1 supplementation reduces hepatic damage caused by hepatitis viral infection.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100010

Over-expression of Mycobacterium neoaurum 3-ketosteroid-&amp;#8710;1-dehydrogenase in Corynebacterium crenatum for efficient bioconversion of 4-androstene-3,17-dione to androst-1,4-diene-3,17-dione
Provedor de dados: 69
Autores: Zhang,Xian; Wu,Dan; Yang,Taowei; Xu,Meijuan; Rao,Zhiming.
Background: 3-Ketosteroid-&amp;#8710;¹-dehydrogenase (KSDD), a flavoprotein enzyme, catalyzes the bioconversion of 4-androstene-3,17-dione (AD) to androst-1,4-diene-3,17-dione (ADD). To date, there has been no report about characterization of KSDD from Mycobacterium neoaurum strains, which were usually employed to produce AD or ADD by fermentation. Results: In this work, Corynebacterium crenatum was chosen asa new host for heterologous expression of KSDD from M. neoaurum JC-12 after codon optimization of the KSDD gene. SDS-PAGE and western blotting results indicated that the recombinant C. crenatum harboring the optimized ksdd (ksdd n) gene showed significantly improved ability to express KSDD. The expression level of KSDD was about 1.6-fold increased C....
Tipo: Journal article
Palavras-chave: Androst-1; 4-diene-3; 17-dione Bioconversion Codon optimization Flavoprotein enzyme Heterologous expression Mycobacterium neoaurum Overexpression Recombinant Corynebacterium Sterol catabolism Whole-cell catalyst.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600013

Influence of initial pH of the growing medium on the activity, production and genes expression profiles of laccase of Pleurotus ostreatus in submerged fermentation
Provedor de dados: 69
Autores: Díaz,Rubén; Téllez-Téllez,Maura; Sánchez,Carmen; Bibbins-Martínez,Martha D; Díaz-Godínez,Gerardo; Soriano-Santos,Jorge.
Background: Enzymatic activity and laccase isoenzymes number of Pleurotus ostreatus grown in different pH values of the growing medium in submerged fermentation and incubated in buffer solutions of different initial pH values were determined. The expression profiles of five laccase genes (Lacc1, Lacc4, Lacc6, Lacc9 and Lacc10) in these cultures were also studied. Results: The highest laccases activity was obtained in cultures grown at initial pH of 4.5 and the lowest in cultures grown at initial pH of 8.5. Isoenzyme profiles were different in all the cases. Lacc1, Lacc4, Lacc6 and Lacc10 were expressed in all the cultures. Conclusions: The initial pH of the growing medium is an important factor for regulating the expression of laccase genes, having an...
Tipo: Journal article
Palavras-chave: Laccases; Pleurotus ostreatus; Submerged fermentation; Zymogram.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400006

Production of &amp;#946;-glucosidase on solid-state fermentation by Lichtheimia ramosa in agroindustrial residues: Characterization and catalytic properties of the enzymatic extract
Provedor de dados: 69
Autores: Garcia,Nayara Fernanda Lisboa; Santos,Flávia Regina da Silva; Gonçalves,Fabiano Avelino; Paz,Marcelo Fossa da; Fonseca,Gustavo Graciano; Leite,Rodrigo Simões Ribeiro.
Background &amp;#946;-Glucosidases catalyze the hydrolysis of cellobiose and cellodextrins, releasing glucose as the main product. This enzyme is used in the food, pharmaceutical, and biofuel industries. The aim of this work is to improve the &amp;#946;-glucosidase production by the fungus Lichtheimia ramosa by solid-state fermentation (SSF) using various agroindustrial residues and to evaluate the catalytic properties of this enzyme. Results A high production of &amp;#946;-glucosidase, about 274 U/g of dry substrate (or 27.4 U/mL), was obtained by cultivating the fungus on wheat bran with 65% of initial substrate moisture, at 96 h of incubation at 35°C. The enzymatic extract also exhibited carboxymethylcellulase (CMCase), xylanase, and...
Tipo: Journal article
Palavras-chave: Cellobiase; Cellulases and hemicellulases; Industrial enzymes; Microbial enzymes.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400010

Simultaneous environmental manipulations in semi-perfusion cultures of CHO cells producing rh-tPA
Provedor de dados: 69
Autores: Vergara,Mauricio; Becerra,Silvana; Díaz-Barrera,Alvaro; Berrios,Julio; Altamirano,Claudia.
We evaluated the combined effect of decreasing the temperature to a mild hypothermia range (34 and 31ºC) and switching to a slowly metabolizable carbon source (glucose substituted by galactose) on the growth and production of a recombinant human tissue plasminogen activator (rh-tPA) by Chinese hamster ovary cells in batch and semi-perfusion cultures. In batch cultures using glucose as a carbon source, decreasing the temperature caused a reduction in cell growth and an increase in specific productivity of rh-tPA of 32% at 34ºC and 55% at 31ºC, compared to cultures at 37ºC. Similar behaviour was observed in cultures at 34ºC using galactose as a carbon source. Nonetheless, at 31ºC, the specific productivity of rh-tPA strongly decreased (about 58%) compared to...
Tipo: Journal article
Palavras-chave: CHO cells; Galactose; Glutamate; Low temperature; Perfusion culture; Rh-tPA.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600002

Molecular characterization and transcriptome profiling of expansin genes isolated from Calotropis procera fibers
Provedor de dados: 69
Autores: Cheema,Hafiza Masooma Naseer; Bashir,Aftab; Khatoon,Asia; Iqbal,Nadia; Zafar,Yusuf; Malik,Kauser A.
The Calotropis procera seed fibers provide an excellent model system to study the genes involved in fiber elongation, fineness and strength. Expansins constitute one of the important gene families involved in plant cell expansion and other cell wall modification processes. Four homologs of Expansin A gene i.e. CpEXPA1, CpEXPA2, CpEXPA3 and CpEXPA4 were isolated from the cDNA library obtained from fast growing Calotropis procera fibers. These homologs represented typical Expansin A family. Each of them had two conserved domains including GH45 like domain and the putative polysaccharide binding domain. The deduced amino acid sequences of the homologs indicated three conserved motifs: i) eight cysteine residues at N-terminus, ii) four tryptophan residues at...
Tipo: Journal article
Palavras-chave: Calotropis procera; CDNA library; Cotton fibers; EXPANSIN A; Signal peptide; Transcriptome profiling.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600010

Transient gene expression in secondary somatic embryos from coffee tissues electroporated with the genes gus and bar
Provedor de dados: 69
Autores: Da Silva,Rafael Fernandez; Menéndez-Yuffá,Andrea.
Different electroporation conditions were evaluated, toward the goal of transformation of Coffea arabica cv. Catimor. The tissues assayed were: embryogenic calli, leaf sections from in vitro plants, and somatic embryos in globular and torpedo stage obtained from cell suspensions. The effect of 1 or 24-hour pretreatment with an enzymatic solution (2% cellulase, 1% macerozyme) and electric field strength (375, 625, 875 V/cm) was evaluated. In all the experiments the tissues were incubated in ASP buffer (potassium aspartate) during three hours, and then one hour with plasmid DNA (pCambia3201, containing gus and bar genes) at room temperature. The electroporation was performed at a capacitance of 900 &amp;#956;F. The effect of the parameters evaluated was...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100006

Inhibitor tolerance and flocculation of a yeast strain suitable for second generation bioethanol production
Provedor de dados: 69
Autores: Westman,Johan O; Taherzadeh,Mohammad J; Franzén,Carl Johan.
Background: Robust second generation bioethanol processes require microorganisms able to ferment inhibitory lignocellullosic hydrolysates. In this study, the inhibitor tolerance and flocculation characteristics of Saccharomyces cerevisiae CCUG53310 were evaluated in comparison with S. cerevisiae CBS8066. Results: The flocculating strain CCUG53310 could rapidly ferment all hexoses in dilute acid spruce hydrolysate, while CBS8066 was strongly inhibited in this medium. In synthetic inhibitory media, CCUG53310 was more tolerant to carboxylic acids and furan aldehydes, but more sensitive than CBS8066 to phenolic compounds. Despite the higher tolerance, the increase in expression of the YAP1, ATR1 and FLR1 genes, known to confer resistance to...
Tipo: Journal article
Palavras-chave: Biofuel; Furfural; Lignocellulose; Phenolic inhibitors; Saccharomyces cerevisiae.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300005

Enhancement with inducers of lacasse production by some strains and application of enzyme to dechlorination of 2,4,5-trichlorophenol
Provedor de dados: 69
Autores: Gedikli,Serap; Aytar,Pinar; Ünal,Arzu; Yamaç,Mustafa; Çabuk,Ahmet; Kolankaya,Nazif.
Lacasse is one of the extracellular enzymes excreted from white and brown rot fungi, which is involved in ligninolysis. In the present study, the effects of the addition of lacasse inducers to the medium on enhancement of enzyme production under conditions of submerged fermentation were researched. At first, a culture medium was selected suitable for lacasse production. To increase the production of lacasse using different inducers and to examine the ability of dechlorination, this article focuses on screen lacasse activity of 21 basidiomycetes isolates grown in five culture media. All inducers evaluated influenced lacasse activity positively except for gallic acid, mannitol, and malt extract for studied isolates. Our findings showed that lacasse activity...
Tipo: Journal article
Palavras-chave: 2; 4; 5-trichlorophenol basidiomycetes dechlorination inducer lacasse.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600006

Microbial-induced remediation of Zn2+ pollution based on the capture and utilization of carbon dioxide
Provedor de dados: 69
Autores: Zhan,Qiwei; Qian,Chunxiang.
Background: Microbial-induced remediation of Zn2+ pollution based on the capture and utilization of carbon dioxide was investigated. In this study, carbon dioxide was absorbed and transformed into carbonate ions under the enzymatic action of Paenibacillus mucilaginosus, which was being utilized to mineralize Zn2+. Results: The compositional and morphological properties of the precipitations were studied using Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The thermal properties of the precipitates were investigated by thermogravimetric-differential scanning calorimetry (TG-DSC). The FTIR results confirmed that the functional groups of the...
Tipo: Journal article
Palavras-chave: Carbon dioxide; Microbial-induced; Mineralization; Paenibacillus mucilaginosus; Remediation.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100005

mRNA transcription and protein expression of PPAR&amp;#947;, FAS, and HSL in different parts of the carcass between fat-tailed and thin-tailed sheep
Provedor de dados: 69
Autores: Xu,Xiaochun; Wei,Xuan; Yang,Yuxin; Niu,Wenzhi; Kou,Qifang; Wang,Xiaolong; Chen,Yulin.
Background The objective of this study was to compare the level differences of mRNA transcription and protein expression of PPAR&amp;#947;, FAS and HSL in different parts of the carcass in different tail-type sheep. Six Tan sheep and six Shaanbei fine-wool sheep aged 9 months were slaughtered and samples were collected from the tail adipose, subcutaneous adipose, and longissimus dorsi muscle. The levels of mRNA transcription and protein expression of the target genes in these tissues were determined by real-time quantitative PCR and western blot analyses. Results The results showed that PPAR&amp;#947;, FAS, and HSL were expressed with spatial differences in tail adipose, subcutaneous adipose and longissimus dorsi muscle of Tan sheep and Shaanbei fine-wool...
Tipo: Journal article
Palavras-chave: Genes; Difference; Tissues; Ovis.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300012

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

Production of antibody fragment (Fab) throughout Escherichia coli fed-batch fermentation process: Changes in titre, location and form of product
Provedor de dados: 69
Autores: Jalalirad,Reza.
Background: Recombinant proteins, including antibodies and antibody fragments, often contain disulfide bond bridges that are necessary for their folding, stability and function. Production of disulfide-bond-containing proteins in the periplasm of Escherichia coli has been very useful, due to unique characteristics of the periplasm, for obtaining fully active and correctly folded products and for alleviating downstream processing. Results: In this study, fed-batch cultivation of Escherichia coli (E. coli) for production of Fab D1.3, which is an anti-hen egg white lysozyme (HEWL) antibody fragment was carried out at 37ºC, and the bacterial cells were induced by adding 0.1 mM IPTG to the culture medium. Fermentor was sampled over the course of fermentation;...
Tipo: Journal article
Palavras-chave: Antibody fragment; Cell disruption; Escherichia coli; Fed-batch fermentation; Periplasmic expression; Recombinant protein.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300009

Management of appropriate agricultural biotechnology for small producers: case study - Ecuador
Provedor de dados: 69
Autores: Wendt,Jan; Izquierdo,Juan.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000100002

Use of Aspergillus niger in the bioleaching of colemanite for the production of boric acid
Provedor de dados: 69
Autores: Bayat,Oktay; Arslan,Volkan; Bayat,Belgin.
Colemanite is one of the most important underground riches of Turkey, having approximately 60% of the world boron deposits, and it has a large portion in the deposits. In this study, chemical leaching and biological leaching methods were used for production of boric acid from colemanite (2CaO Â· 3B3O3 Â· 5H2O) (Emet-KÃ¼tahya, Turkey). Oxalic acid concentration, temperature, stirring time and solid-to-liquid ratio were taken as parameters in the chemical leaching process. It was found that the dissolution rate increases with increasing oxalic acid concentration and temperature but it decreases at higher solid-to-liquid ratios in the chemical leaching process. Using optimum conditions (d100 = 0.075 mm; 5% solids by weight; 0.55 M oxalic acid; 80 Â± 2ÂºC...
Tipo: Journal article
Palavras-chave: Aspergillus niger; Bioleaching; Boric acid; Chemical leaching; Colemanite; Oxalic acid.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300007

Rooting in Km selective media as efficient in vitro selection method for sunflower genetic transformation
Provedor de dados: 69
Autores: Radonic,Laura Mabel; Zimmermann,Julián Marcos; Zavallo,Diego; López,Nilda; López Bilbao,Marisa.
Despite of numerous publications in sunflower genetic transformation, there is no efficient or reproducible protocol with low number of escapes. The latter would indicate that the selection method is not effective. In this work we used Km as selective agent, Agrobacterium tumefaciens EHA105 strain and a vector with the nptII gene under the nos promoter and uidA gene under 35S promoter. The response of agroinfected (A) and control (C) explants during the in vitro culture was studied and in both cases in presence or absence of Km in order to assign a differential morphologic response between transformed and non-transformed plants. The characteristics analyzed were: height, colour/aspect of the plantlets, in vitro rooting and in vitro bud-flower development....
Tipo: Journal article
Palavras-chave: Genetic transformation; Kanamycin; Selection; Sunflower.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300027

Isolation and characterization of hydrocarbon producing green alga Botryococcus braunii from Indian freshwater bodies
Provedor de dados: 69
Autores: Dayananda,Chandrappa; Sarada,Ravi; Kumar,Vinod; Ravishankar,Gokare Aswathanarayana.
Samples of green colonial unicellular microalga Botryococcus braunii were collected from Bear Shola Falls at Kodaikanal (latitude 10.31 N and longitude 77.32 E), Tamil Nadu, India. Specimens were isolated, cultured and examined for its hydrocarbon content, morphological features and DNA structural resemblance with the known strain to confirm its identity. Inter simple sequence repeats (ISSR) finger printing revealed strong genetic similarity among the authentic strain (B. braunii N-836) and the Indian isolated strain (B. braunii CFTRI- Bb1) from Kodaikanal. The type of hydrocarbons produced by the Kodaikanal isolates were analyzed and identified as saturated hydrocarbons in the range of C21 to C33 by GCMS. Tetracosane and octacosane were found as the major...
Tipo: Journal article
Palavras-chave: Biomass; Carbon dioxide; Carotenoids; Fatty acids; Inter simple sequence repeats; Saturated hydrocarbons.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100008

Isolation and analysis of differentially expressed genes from peanut in response to challenge with Ralstonia solanacearum
Provedor de dados: 69
Autores: Ding,Yu Fei; Wang,Chuan Tang; Tang,Yue Yi; Wang,Xiu Zhen; Wu,Qi; Hu,Dong Qing; Yu,Hong Tao; Zhang,Jian Cheng; Cui,Feng Gao; Song,Guo Sheng; Gao,Hua Yuan; Yu,Shan Lin.
Background: Bacterial wilt caused by Ralstonia solanacearum is the most devastating disease in peanut. Planting resistant peanut cultivars is deemed as the sole economically viable means for effective control of the disease. To understand the molecular mechanism underlying resistance and facilitate breeding process, differences in gene expression between seeds of Rihua 1 (a Virginia type peanut variety resistant to bacterial wilt) inoculated with the bacterial pathogen suspension (10(9) cfu ml-1) and seeds of the same cultivar treated with water (control), were studied using the GenefishingTM technology. Results: A total of 25 differentially expressed genes were isolated. Expression of genes encoding cyclophilin and ADP-ribosylation factor, respectively,...
Tipo: Journal article
Palavras-chave: Arachis hypogaea; ARF; Cyclophilin; Differentially expressed genes; Genefishing; Ralstonia solanacearum.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500001

Immobilization and stabilization of papain on chelating sepharose: a metal chelate regenerable carrier
Provedor de dados: 69
Autores: Afaq,Sarah; Iqbal,Jawaid.
A method for immobilization of papain has been selected based on the interaction between its histidine, cysteine and tryptophan residues with the immobilized metal ion (IMI) carrier for maximum binding on a small volume of the carrier. The immobilized papain retained high activity has improved thermal stability and the carrier could be recovered from the spent bound enzyme, to be reused. Reimmobilization of papain on the regenerated matrix was equally effective with the retention of maximum enzyme activity.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300006

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

Isolation by PCR-based methods of a plant antifungal polygalacturonase-inhibiting protein gene
Provedor de dados: 69
A polygalacturonase-inhibiting protein (pgip) gene from Malus domestica cv Granny Smith apple fruit was cloned by degenerate oligo-primed polymerase chain reaction (PCR) and Inverse PCR. An alignment of the pear and bean PGIP sequences was used to design degenerate PCR primers in highly conserved regions. Degenerate PCR allowed the amplification of a 351bp internal fragment of the pgip gene, termed ipgip. The DNA sequence of ipgip was used to design Inverse PCR primers. A Southern blot of apple genomic DNA probed with the ipgip fragment was used to identify restriction enzyme sites for Inverse PCR. Inverse PCR enabled cloning of the remainder of the gene, from which a composite pgip gene sequence was constructed. A new set of PCR primers were designed to...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000300004

Normalized embryoid cDNA library of oil palm (Elaeis guineensis)
Provedor de dados: 69
Autores: Chan,Pek-Lan; Ma,Lay-Sun; Low,Eng-Ti L; Shariff,Elyana M; Ooi,Leslie Cheng-Li; Cheah,Suan-Choo; Singh,Rajinder.
A normalized embryoid cDNA library (EON) was constructed based on reassociation kinetics reaction. Results from dot blot hybridization and sequencing of EON cDNA clones clearly indicated that the normalization process reduced the frequency of high abundance transcripts and increased the frequency of low abundance gene transcripts. A total of 553 non-redundant expressed sequence tags (ESTs) were identified, 325 of these were not observed in the standard oil palm cDNA libraries sequenced previously. A total of 10 EON cDNA clones were chosen for expression profiling across samples from different stages of the tissue culture process. Two of the genes exhibited promising expression patterns for predicting the embryogenic potential in callus. Some of these genes...
Tipo: Journal article
Palavras-chave: Auxin; Expressed sequence tags; Gene expression; Low abundance genes; Tissue culture.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100010

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

Extending shelf life of fresh minced camel meat at ambient temperature by Lactobacillus dlbrueckii subsp. delbrueckii
Provedor de dados: 69
Autores: Kalalou,Ichraq; Faid,Mohamed; Touhami Ahami,Ahmed.
Studies were conducted to stabilize minced meat by fermentation using mixed lactic acid bacteria cultures isolated from natural fermented foodstuffs and selected for their antimicrobial activity against some hazardous microorganisms. Fresh meat of camel purchased from the slaughterhouse of Rabat (Morocco) was minced separately with a meat mincer and supplied with 5% glucose, then inoculated with lactic acid bacteria. Microbiological analyses were carried out to determine standard plate count (SPC), staphylococci, coliforms, enterococci, and lactic acid bacteria. All analyses were determined after 1, 2, 3, 4 and 7 days during the storage. Results showed that a low pH of 4.0-4.2 can be achieved (within 3 days at 22&amp;ordm;C), with a drastic reduction in...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300005

Protein engineering of delta-endotoxins of Bacillus thuringiensis
Provedor de dados: 69
Autores: Saraswathy,Nachimuthu; Kumar,Polumetla Ananda.
Bacillus thuringiensis (Bt) is a valuable environment-friendly biopesticide, which occupies 90% of the world biopesticide market. Its insecticidal properties are attributed to the presence of &lt;FONT FACE=Symbol&gt;d-&lt;/FONT&gt;endotoxins which are synthesized during the sporulation phase of the bacterium. &lt;FONT FACE=Symbol&gt;d-&lt;/FONT&gt;endotoxin or crystal toxin is a multi-domain protein molecule comprising of three distinct domains. Domain I is made of seven alpha-helices, domain II comprises three antiparallel beta sheets, which are folded into loops and domain III is made of a beta sandwich of two antiparallel beta strands. Molecular studies on the structure and functional properties of different &lt;FONT...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200009

Effect of the production or use of mixtures of bakers’ or brewers’ yeast extracts on their ability to promote growth of lactobacilli and pediococci
Provedor de dados: 69
Autores: Champagne,Claude P; Gaudreau,Hélène; Conway,John.
Three brewers’ and three bakers’ yeast extracts (YE) were obtained from five commercial suppliers. They were added to microbiological media and their growth-promoting properties were examined using four lactic cultures (Lactobacillus casei EQ28 and EQ85, Lactobacillus acidophilus EQ57, Pediococcus acidilactici MA18/5-M). Bakers’ YE have a higher total nitrogen content than brewers’ YE, but there was not always a correlation between the nitrogen content and growth. A systematic preference for bakers’ YE over brewers’ YE was only encountered with Lb. casei EQ85, but the other lactic cultures had variable reactions to the source of YE. With Lb. casei EQ85 and Pc. acidilactici 17/5M, mixing of the two sources of YE gave progressively higher growth as a...
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300004

Electrogeneration of hydrogen peroxide applied to the peroxide-mediated oxidation of (R)-limonene in organic media
Provedor de dados: 69
Autores: La Rotta Hernández,Camilo Enrique; Werberich,Diogo Simon; Mattos,Marcio Contrucci Saraiva de; D'Elia,Eliane.
Horse radish peroxidase (HRP) from Armoracia rusticana catalyses the oxidation of (R)-limonene into the oxidized derivatives carveol and carvone. This study compares the direct addition (DA) of hydrogen peroxide with its continuous electrogeneration (EG) during the enzymatic oxidation of (R)-limonene. Reaction mixtures containing HRP, (R)-limonene as substrate, and hydrogen peroxide, added directly or electrogenerated, in 100 mM sodium-potassium phosphate buffer pH 7.0, at 25ºC were studied. Two electrochemical systems for the hydrogen peroxide electrogeneration were evaluated, both containing as auxiliary electrode (AE) a platinum wire and saturated calomel electrode (SCE) as reference. Reticulated vitreous carbon foam (RVCF) and an electrolytic copper...
Tipo: Journal article
Palavras-chave: Armoracia rusticana; Bioelectrochemistry; Carveol; Carvone; Horse-radish peroxidase; Hydrogen peroxide electrogeneration; (R)-limonene.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400006

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

Identification of microsatellites linked to Lr47
Provedor de dados: 69
Autores: Vanzetti,Leonardo Sebastián; Brevis,Juan Carlos; Dubcovsky,Jorge; Helguera,Marcelo.
Leaf rust resistance gene Lr47 is located within a interstitial segment of Triticum speltoides Taush. 7S chromosome translocated to the short arm of chromosome 7A of bread wheat. This gene is resistant against currently predominant races of leaf rust from Argentina. The objectives of this study were to identify microsatellites linked to this source of resistance as a potential tool to introgress this source of resistance. Isogenic lines with and without Lr47 developed from 10 cultivars/breeding lines as well as 10 microsatellites previously mapped in 7AS chromosome were used in this study. Microsatellite gwm 60 was the only marker that co-segregated completely linked to Lr47. These data indicate that gwm 60 could be a valuable marker to introgress Lr47 in...
Tipo: Journal article
Palavras-chave: Gwm 60; Leaf rust; Marker assisted selection; Puccinia triticina Ericks.; Triticum aestivum.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300018

Teaching of Biotechnology in the Biochemistry Course
Provedor de dados: 69
Autores: de Oliveira Marques Serralheiro,Maria Luisa Mourato; Ponces Freire,Ana Maria.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300004

Simultaneous effects of pH and substrate concentration on hydrogen production by acidogenic fermentation
Provedor de dados: 69
Autores: Cubillos,Genoveva; Arrué,Ramon; Jeison,David; Chamy,Rolando; Tapia,Estela; Rodríguez,Jorge; Ruiz-Filippi,Gonzalo.
The present research examined the effects of initial substrate concentration and pH on the yield and productivity of hydrogen production by acidogenic fermentation. Assays were carried out at three different initial pH levels (5.5, 6.5 and 7.5) and three initial substrate concentrations (3, 5 and 10 g COD/L). Glucose was used as carbon source and the experiments were conducted at 37°C in batch tests, after a thermal pretreatment to eliminate methanogenic microorganisms. Conversions of glucose into hydrogen were between 16.75 and 27.25% of theoretical maximum, and high values of hydrogen productivity were obtained. An optimum value for the yield of glucose between initial pH of 6.3 and 3.7 g COD/L and productivity of the 5.95 H2/gVSS h and initial pH of 6.7...
Tipo: Journal article
Palavras-chave: Acidogenic; Gompertz modified; Heat treatment; Hydrogen; Surface response.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100011

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

Heterologous expression of staphylococcal enterotoxin B (seb) gene for antibody production
Provedor de dados: 69
Autores: Vrat Kamboj,Dev; Nema,Vijay; Kumar Pandey,Arun; Kumar Goel,Ajay; Singh,Lokendra.
Staphylococcal food poisoning (SFP) is caused by the members of superantigen family called staphylococcal enterotoxins (SEs). About 20 different types of SEs are produced by Staphylococcus aureus out of which type A (SEA), B (SEB), C (SEC) and D (SED) are commonly implicated in SFP. Among these, SEB is the most potent toxin and has also gained the status of biological warfare (BW) agent. Therefore, detection of SEB is of utmost importance. Any immunological detection system for SEB requires specific and sensitive antibodies which inturn depends on the purity of the SEB. In the present investigation, seb gene of S. aureus was cloned and expressed in E. coli along with biotin as fusion partner to facilitate the purification process. The yield of purified...
Tipo: Journal article
Palavras-chave: Affinity purification; Biotin fusion; ELISA; Gene cloning; SEB; Western blot.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500010

Induction of in vitro roots cultures of Thypha latifolia and Scirpus americanus and study of their capacity to remove heavy metals
Provedor de dados: 69
Autores: Santos-Díaz,María del Socorro; Barrón-Cruz,María del Carmen; Alfaro-De la Torre,María Catalina.
We have established the conditions to obtain in vitro root cultures of Thypha latifolia and Scirpus americanus and have investigated their capacity to remove Pb(II), Mn(II) and Cr(III) from the culture medium. The best conditions for the in vitro culture growth were: an inoculum of 0.2 g of T. latifolia roots and 0.05 g of S. americanus roots (fresh weight), Murashige-Skoog medium and 2 mg L-1of indolacetic acid. The T. latifolia and S. americanus root cultures were cultivated onto media containing Cr (15 µg L-1), Pb (60 µg L-1) or Mn (1.8 mg L-1). Both species were able to remove Pb and Cr near to 100% and 71-100% of Mn from the medium solution during the 6-8 days of experimentation. According to metal concentrations removed from the medium containing the...
Tipo: Journal article
Palavras-chave: Heavy metals; In vitro root cultures; Phytoremediation; Scirpus americanus; Thypha latifolia.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300009

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

Isolation of total RNA from tissues rich in polyphenols and polysaccharides of mangrove plants
Provedor de dados: 69
Autores: Rubio-Piña,Jorge A; Zapata-Pérez,Omar.
RNA extraction from mangrove tissues can be difficult due to the presence of polyphenolic and polysaccharide compounds upon cell disruption. Besides, a successful RNA isolation from mangrove tissues sometimes can be strain and species specific. Two different methods were used to extract RNA from tissues (stems, leaves and roots) of black mangrove (Avicennia germinans) and white mangrove (Laguncularia racemosa), collected from the mangrove area at Progreso, Yucatan, Mexico. An optimized and modified total RNA isolation method was developed for these recalcitrant species. The protocol is based on the CTAB method including &amp;#946;-mercaptoethanol and PVPP with sequential Phenol/Chloroform/isoamyl alcohol extractions to remove protein, and polyphenols,...
Tipo: Journal article
Palavras-chave: Mangrove; Plant tissues; Polysaccharides; RNA isolation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500011

New strains obtained after UV treatment and protoplast fusion of native Trichoderma harzianum: their biocontrol activity on Pyrenochaeta lycopersici
Provedor de dados: 69
Autores: Besoain,Ximena A; Pérez,Luz María; Araya,Antonio; Lefever,Llacolén; Sanguinetti,; Montealegre,Jaime R.
The obtainment of 30 new strains from native Trichoderma harzianum after UV light irradiation (UV-A and UV-C), and of 82 strains resulted from protoplast fusion were accomplished. The new strains, initially selected for their growing rate under low temperature and high pH conditions, as well as for their innocuousness on tomato plants, were tested for in vitro inhibition of Pyrenochaeta lycopersici in dual cultures and due to secretion of volatile and diffusible metabolites. All the UV-A and UV-C selected candidate mutants were innocuous to tomato plants, but none of them showed improvement in their biocontrol activity on P. lycopersici. Th12A20.1 increased 1.3 and 1.9 fold the total fresh weight of Fortaleza tomato plants when compared to its parental...
Tipo: Journal article
Palavras-chave: Corky root; Mutagenesis; Tomato diseases; Trichoderma; Volatile and diffusible metabolites.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400013

PLANT BIOTECHNOLOGY IN THE 21ST CENTURY: THE CHALLENGES AHEAD
Provedor de dados: 69
Autores: Altman,Arie.
In a world where population growth is outstripping food supply agricultural -and especially plant-biotechnology, needs to be swiftly implemented in all walks of life. Achievements today in plant biotechnology have already surpassed all previous expectations, and the future is even more promising. The full realisation of the agricultural biotechnology revolution depends on both continued successful and innovative research and development activities and on a favourable regulatory climate and public acceptance. Biotechnology should be fully integrated with classical physiology and breeding: (1) as an aid to classical breeding, (2) for generation of engineered organisms, (3) for integration of microorganisms into agricultural production systems. Biotechnology...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000200001

Genomics and proteomics offers new hopes towards a personalized approach to lung cancer prevention and treatment
Provedor de dados: 69
Autores: Gil,Lionel; Adonis,Marta.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000300002

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

Effect of inactivation and reactivation conditions on activity recovery of enzyme catalysts
Provedor de dados: 69
Autores: Wilson,Lorena; Illanes,Andrés; Romero,Oscar.
Enzymes are labile catalysts with reduced half-life time that can be however improved by immobilization and, furthermore, already inactivated catalyst can be recovered totally or partially, therefore allowing the large scale application of enzymes as process catalysts. In recent years a few studies about reactivation of enzyme catalysts have been published as a strategy to prolong the catalyst lifetime. Reported results are very good, making this strategy an interesting tool to be applied to industrial process. These studies have been focused in the evaluation of different variables that may have a positive impact both in the rate and level of activity recovery, being then critical variables for conducting the reactivation process at productive scale. The...
Tipo: Journal article
Palavras-chave: CLEAs; Enzyme immobilization; Enzyme reactivation; Glyoxyl agarose; Inactivation; Organic cosolvents; Unfolding - refolding.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300015

Identification of a minimal microsatellite marker panel for the fingerprinting of peach and nectarine cultivars
Provedor de dados: 69
Autores: Rojas,Gabriela; Méndez,Marco A; Muñoz,Carlos; Lemus,Gamalier; Hinrichsen,Patricio.
The genetic characterization of 117 peach and nectarine cultivars (Prunus persica (L.) Batsch) using microsatellite (SSR) markers is presented. Analyzed genotypes include the complete list of cultivars under intellectual property (IP) protection in Chile. One hundred and two out of the 117 cultivars under study could be identified using only 7 SSRs. Other 5 cultivars were differentiated using 3 additional markers, but 5 pairs of genotypes were not differentiable. The average expected heterozygosity for the set of markers was 0.55, ranging from 0.28 in BPPCT-008 to 0.81 in CPPCT-022, with an F value of 0.37. A Neighbor-Joining dendrogram showed that, with few exceptions, peaches and nectarines clustered separately. These results are the basis for the...
Tipo: Journal article
Palavras-chave: Cultivar identification; Fingerprinting; Prunus persica; Simple sequence repeats; SSR.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500004

Salinity effects on protein content, lipid peroxidation, pigments, and proline in Paulownia imperialis (Siebold &amp;amp; Zuccarini) and Paulownia fortunei (Seemann &amp;amp; Hemsley) grown in vitro
Provedor de dados: 69
Autores: Ayala-Astorga,Gloria Irma; Alcaraz-Meléndez,Lilia.
We evaluated the effects of saline stress on soluble proteins, lipid peroxidation (TBAR), chlorophyll a, chlorophyll b, &amp;#946;-carotene, violaxanthin, and proline in Paulownia imperialis and Paulownia fortunei plants grown in vitro. When the propagated plants reached a determined size, they were transferred aseptically to WPM culture medium containing different sodium chloride concentrations (0, 20, 40, 60, 80, and 160 mM) and were sampled at 15 and 30 days. Proline content was determined at 30 days after transfer only. Protein concentration significantly decreased with the highest salt levels in P. imperialis compared to controls in which no sodium chloride was added. In both P. imperialis and P. fortunei, lipid peroxidation significantly increased at...
Tipo: Journal article
Palavras-chave: Paulownia fortunei; Paulownia imperialis; Pigments; Proline; Proteins; Salinity; TBARS; Tissue culture.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500013

Modification of the activity of an alpha-amylase from Bacillus licheniformis by several surfactants
Provedor de dados: 69
Autores: Bravo Rodríguez,Vicente; Jurado Alameda,Encarnación; Martínez Gallegos,Juan Francisco; Reyes Requena,Antonia; García López,Ana Isabel; Sampaio Cabral,Joaquim Manuel; Fernandes,Pedro; Pina da Fonseca,Luis Joaquim.
The influence of different commercial surfactants on the enzymatic activity of a commercial alpha-amylase from Bacillus licheniformis (Termamyl 300 L) has been studied. As non-ionic surfactants, alkyl polyglycosides (Glucopon® 215, Glucopon® 600 and Glucopon® 650) were studied, as were fatty alcohol ethoxylates (Findet 1214N/23 and Findet 10/15), and nonyl phenol ethoxylate (Findet 9Q/21.5NF). Also, an anionic surfactant, linear alkyl benzene sulfonate (LAS) was assayed. In general, none of the non-ionic surfactants studied, except Findet 10/15, vary substantially the enzymatic activity. Findet 10/15 has the strongest hydrophobic character and reduces the enzymatic activity more significantly the greater its concentration. Regarding LAS, this surfactant...
Tipo: Journal article
Palavras-chave: Alpha-amylase; Alkyl polyglycosides; Enzymatic activity; Fatty alcohol ethoxylates; Linear alkyl benzene sulfonate; Nonyl phenol ethoxylate.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500012

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

Membrane damage of bacteria by silanols treatment
Provedor de dados: 69
Autores: Kim,Yun-mi; Farrah,Samuel; Baney,Ronald H.
Antimicrobial action of silanols, a new class of antimicrobials, was investigated by transmission electron microscopy and fluorescent dye studies. Gram-negative bacteria, Escherichia coli and Pseudomonas aeruginosa and Gram-positive bacteria, Staphylococcus aureus and Enterococcus faecalis were treated by silanols at concentration of less than 0.2 wt% for one hour. Membrane damage of the bacteria by the silanol treatment was clearly observed by transmission electron microscopy. Separation of the cytoplasmic membrane from the outer membrane for E. coli and disorganized cytoplasmic membrane of the Gram-positive bacteria were observed when compared to the control. Fluorescent dyes, green-fluorescent nucleic acid stain (Syto 9) and the red-fluorescent nucleic...
Tipo: Journal article
Palavras-chave: Antimicrobials; Hydrophobicity; Organosilicon compounds.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200009

Enhancement of biodegradation potential of catechol 1,2-dioxygenase through its immobilization in calcium alginate gel
Provedor de dados: 69
Autores: Guzik,Urszula; Hupert-Kocurek,Katarzyna; Marchlewicz,Ariel; Wojcieszynska,Danuta.
Background In biodegradation processes free enzymes often undergo deactivation. Thus, it is very important to obtain highly stable enzymes by different methods. Immobilization allows for successful stabilization of many multimeric enzymes by increasing the rigidity of the enzyme structure. This study aimed to evaluate some environmental factors that affect catechol 1,2-dioxygenase from Stenotrophomonas maltophilia KB2 immobilized in alginate hydrogel. The goal of the present work was to improve the functional stability of the enzyme by increasing its structural rigidity. Results Immobilization yield and expressed activity were 100% and 56%, respectively. Under the same storage conditions, the activity of the immobilized enzyme was still observed on the...
Tipo: Journal article
Palavras-chave: Arenes; Entrapment; Intradiol dioxygenase; Stenotrophomonas.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000200005

Xylanase and &amp;#946;-xylosidase from Penicillium janczewskii: Purification, characterization and hydrolysis of substrates
Provedor de dados: 69
Autores: Fanchini Terrasan,César Rafael; Guisan,José Manuel; Cano Carmona,Eleonora.
Background: Xylanases and &amp;#946;-D-xylosidases are the most important enzymes responsible for the degradation of xylan, the second main constituent of plant cell walls. Results: In this study, the main extracellular xylanase (XYL I) and p-xylosidase (BXYL I) from the fungus Penicillium janczewskii were purified, characterized and applied for the hydrolysis of different substrates. Their molecular weights under denaturing and non-denaturing conditions were, respectively, 30.4 and 23.6 kDa for XYL I, and 100 and 200 kDa for BXYL I, indicating that the latter is homodimeric. XYL I is highly glycosylated (78%) with optimal activity in pH 6.0 at 65°C, while BXYL I presented lower sugar content (10.5%) and optimal activity in pH 5.0 at 75°C. The half-lives...
Tipo: Journal article
Palavras-chave: Xylanolytic enzymes; Enzyme characterization; Enzyme purification; Xylan hydrolysis; Xylooligosaccharides hydrolysis.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500006

Mitotic aberrations in coffee (Coffea arabica cv. 'Catimor') leaf explants and their derived embryogenic calli
Provedor de dados: 69
Autores: Menéndez-Yuffá,Andrea; Fernandez Da Silva,Rafael; Rios,Liliana; Xena de Enrech,Nereida.
Dividing cells of leaves used as sources of explants from coffee plants (Coffea arabica cv. 'Catimor') and those of their derived calli were analyzed for mitotic aberrations. The studied tissues were prepared by squashing and stained with carbolfuchsin. A total of 1551 leaf and 4568 callus cells were surveyed. The majority (79 %) of leaf and calli (75 %) cells showed normal mitosis, however, cells with mitotic abnormalities were also found in both tissues. These included: polyploids, aneuploids, sticky chromosomes, double prophases and lagging chromosomes. Additionally, interphase cells with micronuclei or binucleated were also observed. The frequencies of these abnormalities were statistically different in calli and leaves. Calli showed a few other...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000200008

Preservation of endangered Tunisian grapevine cultivars using embryogenic cultures
Provedor de dados: 69
Autores: Bouamama,Badra; Jardak,Rahma; Salem,Asma Ben; Ghorbel,Abdelwahed; Mliki,Ahmed.
The preservation of embryogenic lines derived from several endangered local grapevine cultivars was studied. Embryogenic calluses were obtained from immature anthers of eight cultivars, sampled on both fruity-cuttings and field grown vines. Anthers at the 'separated flower' stage, derived from fruity-cuttings, resulted in an increased induction of somatic embryogenesis, compared to those derived from the field. Pro-embryogenic calluses were induced on Chée and Pool (1987) basal medium, supplemented with 9 µM of 2,4-dichlorophenoxyacetic acid (2,4-D) and 11.35 µM of thidiazuron (TDZ) under dark conditions. Different anther zones (filament, abaxial, adaxial, lateral zones and entire anthers) were involved in somatic embryogenesis induction. The percentages...
Tipo: Journal article
Palavras-chave: Forced anthers; Long-term maintenance; Somatic embryos; Vitis vinifera.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200006

Thermostable lipase from a newly isolated Staphylococcus xylosus strain; process optimization and characterization using RSM and ANN
Provedor de dados: 69
Autores: Khoramnia,Anahita; Lai,Oi Ming; Ebrahimpour,Afshin; Tanduba,Carynn Josue; Voon,Tan Siow; Mukhlis,Suriati.
Normal feed forward back-propagation artificial neural network (ANN) and cubic backward elimination response surface methodology (RSM) were used to build a predictive model of the combined effects and optimization of culture parameters for the lipase production of a newly isolated Staphylococcus xylosus. The results demonstrated a high predictive accuracy of artificial neural network compared to response surface methodology. The optimum operating condition obtained from the ANN model was found to be at 30ºC incubation temperature, pH 7.5, 60 hrs incubation period, 1.8% inoculum size and 60 rpm agitation. The lipase production increased 3.5 fold for optimal medium. The produced enzyme was characterized biochemically and this is the first report about a...
Tipo: Journal article
Palavras-chave: Artificial neural network; Characterization; Lipase; Optimization; Response surface methodology; Staphylococcus xylosus.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500015

Isolation of a UDP-glucose: Flavonoid 5-O-glucosyltransferase gene and expression analysis of anthocyanin biosynthetic genes in herbaceous peony (Paeonia lactiflora Pall.)
Provedor de dados: 69
Autores: Zhao,Da Qiu; Han,Chen Xia; Ge,Jin Tao; Tao,Jun.
Herbaceous peony (Paeonia lactiflora Pall.) is an excellent material for studying the formation of flower colour because of its abundant colour. The full-length cDNA of a UDP-glucose: Flavonoid 5-O-glucosyltransferase gene (UF5GT) containing 1629 bp nucleotides was obtained from P. lactiflora. The expression patterns of nine related anthocyanin biosynthetic genes (PlPSY, PlCHS, PlCHI, PlF3H, PlF3'H, PlDFR, PlANS, PlUF3GT and PlUF5GT) in diurnal variation petals showed that their expression peaks were basically at 15:00 and the expression patterns were consistent with the trend of sampling conditions except individual gene. And the highest expression levels were in PlCHS, PlDFR and PlUF3GT, which could be the candidates to regulate P. lactiflora flower...
Tipo: Journal article
Palavras-chave: Anthocyanin; Expression; Glucosyltransferase; Herbaceous peony.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600009

Identification of leaf rust resistance genes in selected Argentinean bread wheat cultivars by gene postulation and molecular markers
Provedor de dados: 69
Autores: Vanzetti,Leonardo Sebastián; Campos,Pablo; Demichelis,Melina; Lombardo,Lucio Andres; Aurelia,Paola Romina; Vaschetto,Luis María; Bainotti,Carlos Tomás; Helguera,Marcelo.
Leaf rust, caused by Puccinia triticina Eriks. is a common and widespread disease of bread wheat (Triticum aestivum L.), in Argentina. Host resistance is the most economical, effective and ecologically sustainable method of controlling the disease. Gene postulation helps to determine leaf rust resistance genes (Lr genes) that may be present in a large group of wheat germplasm. Additionally presence of Lr genes can be determined using associated molecular markers. The objective of this study was to identify Lr genes that condition leaf rust resistance in 66 wheat cultivars from Argentina. Twenty four differential lines with individual known leaf rust resistance genes were tested with 17 different pathotypes of leaf rust collected from Argentina. Leaf rust...
Tipo: Journal article
Palavras-chave: Genetic control of pathogens; Molecular markers; Plant breeding.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300009

Influence of various fermentation variables on exo-glucanase production in Cellulomonas flavigena
Provedor de dados: 69
Autores: Rajoka,Muhammad Ibrahim.
The influence of carbon and nitrogen sources on the production of exo-glucanase was investigated. The enzyme production was variable according to the carbon or nitrogen source used. Levels of beta-cellobiohydrolase (CBH) were minimal in the presence of even low concentrations of glucose. Enzyme production was stimulated by other carbohydrates and thus is subject to carbon source control by easily metabolizable sugars. In Dubos medium, on cellobiose, the cellobiohydrolase titres were 2-to 110-fold higher with cells growing on monomeric sugars and 2.7 times higher than cells growing on other disaccharides. alpha-Cellulose was the most effective inducer of beta-cellobiohydrlase and filter paperase (FPase) activities, followed by kallar grass straw....
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000300007

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

Knowledge about and acceptance of genetically modified organisms among pre-service teachers: a comparative study of Turkey and Slovenia
Provedor de dados: 69
Autores: Sorgo,Andrej; Ambrozic-Dolinsek,Jana; Usak,Muhammet; Özel,Murat.
Genetically modified organisms cannot be regarded as merely a topic for academic debate, since these have serious implications as a research field and for production based on genetic engineering. Public debates rarely base their arguments on elements rooted in scientific arguments and knowledge but are heavily loaded with emotions, opinions and informal reasoning. This study aimed to investigate the knowledge and acceptance of genetically modified organisms among prospective teachers in Slovenia and Turkey. Knowledge of genetic modification was measured with a two-tier instrument. The level of acceptance of genetic modification was measured with a 17-item instrument. Findings revealed that knowledge of genetics and biotechnology barely influenced the...
Tipo: Journal article
Palavras-chave: Biotechnology; Genetic engineering; Genetic modifications; Teaching.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400005

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 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

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

Rapamycin pre-treatment abrogates Tumour Necrosis Factor-&amp;#945; down-regulatory effects on LXR-Î± and PXR mRNA expression via inhibition of c-Jun N-terminal kinase 1 activation in HepG2 cells
Provedor de dados: 69
Autores: Ng,Di-Lin; Tie,Shin-Wei; Ong,Pei-Chin; Lim,Wyi-Sian; Tengku-Muhammad,Tengku-Sifzizul; Choo,Quok-Cheong; Chew,Choy-Hoong.
The Liver X Receptor (LXR) and Pregnane X Receptor (PXR) are members of the nuclear receptor superfamily. Previously, they have been classified as important regulators of lipid homeostasis. However, recent studies have shown that they may be implicated in anti-inflammatory responses as well. This study shows that Tumour Necrosis Factor-Î± (TNF-Î±) treatment reduces both LXR-Î± and PXR mRNA expression. However, pre-treatment with rapamycin, an mTOR inhibitor, followed by TNF-Î± stimulation, significantly induces LXR-Î± and PXR mRNA expression to ~17- and ~2-fold, respectively. This suggests that mTORC1, a multi-molecular complex of which mTOR is a member, may act as a negative regulator that inhibits the induction of LXR-Î± and PXR as anti-inflammatory...
Tipo: Journal article
Palavras-chave: Akt; C-Jun; Homeostasis; Inflammation; MKK7; Transcription factor.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300008

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

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

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

Non-destructive in vitro selection of microspore-derived embryos with the fertility restorer gene for CMS Ogu-INRA in winter oilseed rape (Brassica napus L.)
Provedor de dados: 69
Autores: Havlí&amp;#269;ková,Lenka; Klíma,Miroslav; P&amp;#345;ibylová,Marie; Hilgert-Delgado,Alois Antonín; Ku&amp;#269;era,Vratislav; &amp;#268;urn,Vladislav.
Background Microspore embryogenesis and cytoplasmic male sterility system (CMS) are two approaches widely exploited in Brassica napus breeding for production of homozygous doubled haploid (DH) lines and F1 hybrids respectively. Cytoplasmic male sterility system (CMS) is one of the most important pollination systems for hybrid seed production and utilisation of doubled haploid system to quickly prepare fully homozygous fertility restorer lines for CMS Ogu-INRA is very beneficial. Generally, only a small part of microspore-derived embryos is used for plant regeneration, without any knowledge about their properties. Therefore, the possibility of early detection of desirable genotypes bearing a single dominant nuclear fertility restorer (Rfo) gene, can double...
Tipo: Journal article
Palavras-chave: Cytoplasmic male sterility; Microspore embryogenesis; Ogura CMS; Oilseed rape; Rfo gene.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100011

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

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

Utilization of coconut oil mill waste as a substrate for optimized lipase production, oil biodegradation and enzyme purification studies in Staphylococcus pasteuri
Provedor de dados: 69
Autores: P,Kanmani; K,Kumaresan; J,Aravind.
Background Oil and grease laden wastewaters pose hindrance to the treatment units and further threaten the receiving water bodies. Lipase-producing microbial strains are increasingly being exploited for the remediation of such effluents. Results When bacterial strains isolated from oil mill effluent were screened for their lipolytic activity, two isolates, COM-4A and COM-6B showed significant extracellular lipase activity. They were identified to be Staphylococcus pasteuri and Bacillus subtilis, respectively. S. pasteuri COM-4A was cultivated in nutrient media based on coconut oil mill waste (CMW), in which it showed good growth at concentrations up to 20 g/L. While growing in such media, it was capable of producing lipase and other important extracellular...
Tipo: Journal article
Palavras-chave: Bioremediation; Fat and oil contaminants; Ion exchange chromatography; Lipase characterization; Response surface methodology.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100005

Viability in protoplasts and cell suspensions of Coffea arabica cv. Catimor
Provedor de dados: 69
Autores: Fernandez-Da Silva,Rafael; Menéndez-Yuffá,Andrea.
Two methods were evaluated in order to assess the viability of protoplasts and cell suspensions of Coffea arabica cv. Catimor used in a protocol of transformation by electroporation. One method consisted of staining with 1 % Evans blue and the other staining with 1% 3-[4,5-dimethyltiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT). When Evans blue was applied to viable cells and protoplasts they either did not stain or acquired a faint blue colour. However, it was difficult to distinguish the non-viable cells in the wide spectrum of clear blue tonalities. In contrast, with the MTT assay only the viable cells and protoplasts reduced this salt to the red coloured formazan; viable and non-viable cells were distinguished more clearly with MTT than with Evans...
Tipo: Journal article
Palavras-chave: Cell suspensions; Cell viability; Coffee; Evans blue; MTT; Protoplasts.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500016

Efficiency of RAPD and ISSR markers system in accessing genetic variation of rice bean (Vigna umbellata) landraces
Provedor de dados: 69
Autores: Muthusamy,Saraladevi; Kanagarajan,Selvaraju; Ponnusamy,Shanmugasundaram.
Vigna umbellata (Thunb.) Ohwi and Ohashi commonly known as rice bean or climbing mountain bean is under-exploited tropical legume. Genetic variation between 10 landraces of rice bean was evaluated using random amplified polymorphic DNA (RAPD) and inter simple sequence repeats (ISSR) markers. Among these markers, RAPD primers generated 987 amplification products of which 719 were polymorphic and ISSR markers produced 479 amplification products, out of which 296 were polymorphic. RAPD fingerprinting detected more polymorphic loci (70.30%) than the ISSR fingerprinting (61.79%). Mean PIC (polymorphism information content) for each of these marker systems (0.243 for RAPD and 0.203 for ISSR) suggested that both the marker systems were equally effective in...
Tipo: Journal article
Palavras-chave: Genetic diversity; ISSRs; Landraces; Rice bean; RAPDs; Vigna umbellata.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000300004

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

Predicting regulatory elements in repetitive sequences using transcription factor binding sites
Provedor de dados: 69
Autores: Horng,Jorng-Tzong; Cho,Wen-Fu.
Repeat sequences are the most abundant ones in the extragenic region of genomes. Biologists have already found a large number of regulatory elements in this region. These elements may profoundly impact the chromatin structure formation in nucleus and also contain important clues in genetic evolution and phylogenic study. This study attempts to mine rules on how combinations of individual binding sites are distributed repeat sequences. The association rules mined would facilitate efforts to identify gene classes regulated by similar mechanisms and accurately predict regulatory elements. Herein, the combinations of transcription factor binding sites in the repeat sequences are obtained and, then, data mining techniques are applied to mine the association...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000300004

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

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

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

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

Identification of phase relative genes in tetrasporophytes and female gametophytes of Gracilaria/Gracilariopsis lemaneiformis (Gracilariales, Rhodophyta)
Provedor de dados: 69
Autores: Ren,Xueying; Zhang,Xuecheng; Sui,Zhenghong.
Genes differentially expressed between tetrasporophytes and female gametophytes of Gracilaria/Gracilariopsis lemaneiformis were isolated by suppression subtractive hybridization (SSH) and screened by dot-blot macro-arrays. Different expression profiles of selected clones based on the results of dot-blot macro-arrays were verified using virtual Northern blots. Totally, 14 phase relative cDNAs had been isolated and sequence identified. Among them, seven cDNAs were respectively homologous to crucial metabolic enzymes, Rab GTPase, RP42 homolog, and two hypothetical proteins, while the rest did not have significant hits in the databases examined. The results of virtual Northern blots revealed that 11 cDNAs were differentially expressed between the two samples,...
Tipo: Journal article
Palavras-chave: Female gametophyte; Gracilaria/Gracilariopsis lemaneiformis; Suppression subtractive hybridization; Tetrasporophyte; Virtual Northern blot.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200006

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

Polymorphism of three milk protein genes in Mexican Jersey cattle
Provedor de dados: 69
Autores: Zepeda-Batista,José Luis; Alarcón-Zúñiga,Baldomero; Ruíz-Flores,Agustín; Núñez-Domínguez,Rafael; Ramírez-Valverde,Rodolfo.
The objective was to estimate the allelic and genotypic frequencies, genetic diversity and polymorphic information content for the &amp;#946;-casein, &amp;#954;-casein and &amp;#946;-lactoglobulin genes. Blood and frozen semen samples were collected from 453 Jersey individuals registered by the Mexican Jersey Cattle Association. Twenty eight breed specific SNP primers for whole genes were used. The B allele of &amp;#954;-casein had higher frequency (0.69) than the A (0.26) and E (0.05). For &amp;#946;-lactoglobulin, the highest frequency was for B (0.72), followed by A and C alleles (0.26 and 0.02, respectively). The &amp;#946;-casein allele with the highest frequency was A² (0.71), followed by A¹ (0.19), A³ (0.05), B (0.04) and C (0.01). The average...
Tipo: Journal article
Palavras-chave: &amp;#946; -Casein &amp;#946; -Lactoglobulin Genetic diversity &amp;#954; -Casein.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100001

Enhanced production of dimethyl phthalate-degrading strain Bacillus sp. QD14 by optimizing fermentation medium
Provedor de dados: 69
Autores: Mo,Jixian; Wang,Zhigang; Xu,Weihui; Li,Shanshan; Yu,Zhidan.
Background Integrated statistical experimental designs were applied to optimize the medium constituents for the production of a dimethyl phthalate (DMP)-degrading strain Bacillus sp. QD14 in shake-flask cultures. A Plackett-Burman design (PBD) was applied to screen for significant factors, followed by the Steepest Ascent Method (SAM) to find the nearest region of maximum response. A Box-Behnken design (BBD) of the Response Surface Methodology (RSM) was conducted to optimize the final levels of the medium components. Results After the regression equation and response surface contour plots were analyzed, the concentrations of glucose, corn meal and NaCl were found to significantly influence the biomass of DMP-degrading bacteria. A combination of 22.88 g/L of...
Tipo: Journal article
Palavras-chave: Bacillus; Box-Behnken design; Dimethyl phthalate; Medium optimization; Plackett-Burman design.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300016

Studies on statistical optimization of sulforaphane production from broccoli seed
Provedor de dados: 69
Autores: Wu,Yuanfeng; Mao,Jianwei; Mei,Lehe; Liu,Shiwang.
Background: Natural sulforaphane (SF) has been of increasing interest for nutraceutical and pharmaceutical industries due to its anti-cancer effect. The main objective of the present work was to optimize the production of SF from broccoli seed using response surface methodology. Results: Three major factors (hydrolysis time, water volume and ethyl acetate volume) were screened out through Plackett-Burman (PB) factorial design. The methods of steepest ascent combined with central composite design (CCD) were employed for optimization of the SF production process. The optimal extraction conditions for SF production were a hydrolysis time of 13 min, a hydrolysis volume/weight ratio of 2.9:1 (v/g) and an extraction volume/weight ratio of 17.5:1 (v/g). The...
Tipo: Journal article
Palavras-chave: Broccoli seed; Central composite design; Plackett-Burman design; Production; Sulforaphane.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600001

Isolation of simple sequence repeats from groundnut
Provedor de dados: 69
Autores: Tang Wang,Chuan; Dao Yang,Xin; Xu Chen,Dian; Lin Yu,Shan; Zhen Liu,Guang; Yi Tang,Yue; Zhi Xu,Jian.
SSRs have proved to be the most powerful tool for variety identification in groundnut of similar origin, and have much potential in genetic and breeding studies. To facilitate SSR discovery in groundnut, we proposed a highly simplified SSR isolation protocol based on multiple enzyme digestion/ligation, mixed biotin-labeled probes and streptavidin coated magnetic beads hybridization capture strategy. Of the 272 colonies randomly picked for sequencing, 119 were found to have unique SSR inserts
Tipo: Journal article
Palavras-chave: Groundnut; Isolation; Simple sequence repeat.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300015

Effect of isomalto-oligosaccharide and gentio-oligosaccharide on the growth and fatty acid profile of Lactobacillus plantarum
Provedor de dados: 69
Autores: Soto,Carmen.
Background: Lactobacillus sp. are probiotic microorganisms, and some of them are able to produce conjugated linoleic acid (CLA) via the bio-hydrogenation of linoleic acid (LA). Both CLA and LA are polyunsaturated fatty acids commonly used in the prevention and control of cardiovascular disease, high cholesterol, and cancer, among other ailments. The carbon source is one variable that can affect the growth and characteristics of these bacteria. Molecules called prebiotics are known to benefit human health by stimulating the growth and activity of probiotic bacteria present in the intestinal microflora. The aim of this study was to evaluate how different oligosaccharides affect the growth and fatty acid profile of Lactobacillus plantarum (NRRL - B4496). L....
Tipo: Journal article
Palavras-chave: CLA; Fatty acid profile; Lactobacillus plantarum; Oligosaccharides.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400008

SSR genetic diversity assessment of popular pigeonpea varieties in Malawi reveals unique fingerprints
Provedor de dados: 69
Autores: Njung'e,Vincent; Deshpande,Santosh; Siambi,Moses; Jones,Richard; Silim,Said; De Villiers,Santie.
Background: Pigeonpea (Cajanus cajan (L.) Millsp.) is a drought tolerant legume of the Fabaceae family and the only cultivated species in the genus Cajanus. It is mainly cultivated in the semi-arid tropics of Asia and Oceania, Africa and America. In Malawi, it is grown as a source of food and income and for soil improvement in intercropping systems. However, varietal contamination due to natural outcrossing causes significant quality reduction and yield losses. In this study, 48 polymorphic SSR markers were used to assess the diversity among all pigeonpea varieties cultivated in Malawi to determine if a genetic fingerprint could be identified to distinguish the popular varieties. Results: A total of 212 alleles were observed with an average of 5.58 alleles...
Tipo: Journal article
Palavras-chave: Genetic variation; Genotyping; Microsatellites; Seed purity.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300008

Production of phenolic metabolites by Deschampsia antarctica shoots using UV-B treatments during cultivation in a photobioreactor
Provedor de dados: 69
Autores: Sequeida,Álvaro; Tapia,Eduardo; Ortega,Marcelo; Zamora,Pablo; Castro,Álvaro; Montes,Christian; Zúñiga,Gustavo E; Prieto,Humberto.
Deschampsia antarctica (DA), the only species in the Gramineae family endemic to the Antarctic territory, is characterized by a combination of high levels of free endogenous phenylpropanoid compounds under normal in situ and in vitro growth conditions. In this article, we describe the design and use of a specific temporary immersion photobioreactor to produce both increased DA biomass and secondary metabolite accumulation by UV-B elicitation during cultivation. Three min-long immersions in an induction medium applied every 4 hrs at 14ºC ± 1 and 20/4 hrs light/darkness photoperiod increased DA biomass production over previous in vitro reports. Biomass duplication was obtained at day 10.7 of culturing, and maximum total phenolics and antioxidant activity...
Tipo: Journal article
Palavras-chave: Deschampsia antarctica; Phenolic compounds; Temporary immersion bioreactor; UV-B elicitation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400008

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

Genetic diversity and population structure analysis of strawberry (Fragaria x ananassa Duch.) using SSR markers
Provedor de dados: 69
Autores: Yoon,Min-Young; Moe,Kyaw Thu; Kim,Dae-Young; Rho,Il-Rae; Kim,Su; Kim,Ki-Taek; Won,Mi-Kyoung; Chung,Jong-Wook; Park,Yong-Jin.
In total, 18 simple sequence repeat (SSR) markers were used to analyze the genetic diversity and population structure of 59 accessions of cultivated strawberry (Fragaria x ananassa Duch.) from Korea, Germany, United States, United Kingdom, and Japan. In total, 101 alleles were detected with an average of 5.6 per locus and 21 specific alleles were identified. Notably, one genotype (Blonoli from Germany) possessed a maximum of 10 different unique alleles specific to each genotype. The gene diversity varied from 0.027 (EMPaEKO1B) to 0.791 (CFACT110), with an average value of 0.509. PIC values ranged from 0.026 to 0.762 (average 0.454). A model-based structure analysis revealed the presence of two populations. The accessions that were clearly assigned to a...
Tipo: Journal article
Palavras-chave: Genetic diversity; Population structure; SSR markers; Strawberry.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200006

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

Multiple gene knock-down by a single lentiviral vector expressing an array of short hairpin RNAs
Provedor de dados: 69
Autores: Stove,Veronique; Smits,Kaatje; Naessens,Evelien; Plum,Jean; Verhasselt,Bruno.
RNA interference (RNAi), mediated by short double-stranded RNAs, is a powerful mechanism for posttranscriptional gene silencing. Sustained expression of short hairpin RNA (shRNA) can be accomplished in mammalian cells by viral delivery systems. Using lentiviral constructs, stable gene silencing is established both in dividing and non-dividing cells. Targeting one single gene can lead to the development of escape mutants or may be insufficient to silence redundant pathways. Therefore, simultaneous targeting of multiple genes may be necessary. We have generated a lentiviral vector-based system for expression of multiple shRNAs from a single viral vector, which also encodes an EGFP reporter protein. We show that knock-down of each single gene from multiple...
Tipo: Journal article
Palavras-chave: EGFP; Lentiviral gene transfer; Multiple knock-down; RNAi; Rho GTPases; ShRNA.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500013

Latin American Genome Initiative, the Creation of a Network and Web Based Resource to Aid and Nurture Genome Biology in Developing Countries
Provedor de dados: 69
Autores: Ramírez,Jose Luis; González,Alicia; Cantú,José María; Chavez-Crooker,Pamela; Leiva,Juan Carlos; Blamey,Jenny M.; Cortes,Hernan; Holmes,David.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300002

Viability of probiotic bacteria and some chemical and sensory characteristics in cornelian cherry juice during cold storage
Provedor de dados: 69
Autores: Nematollahia,Amene; Sohrabvandi,Sara; Mortazavian,Amir Mohammad; Jazaeri,Sahar.
Background: Increased popularity of vegetarianism, lactose intolerance, and the high cholesterol content in dairy products, are all factors that have recently increased the demand for nondairy probiotic products. The objective of this study is to evaluate the effect of refrigeration on the viability of probiotics and asses some of the chemical and sensory characteristics in cornelian cherry juice. Results: The Iranian native probiotic strain (L. casei T4) showed greater viability compared to industrial types (viable count of 8.67 log cfu/mL versus &lt;6.0 log cfu/mL at d 28). However, this most tolerant Iranian strain, could not withstand the conditions of 'Natural juice' at pH 2.6 for more than 7 d. Following a pH adjusted treatment (to pH ~3.5), the...
Tipo: Journal article
Palavras-chave: Antioxidant activity; Anthocyanin; Cornelian cherry; Phenolic compounds; Probiotic; Viability.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300005

Sorption kinetics of Pb2+ and Cu2+ ions from aqueous solution by Nipah palm (Nypa fruticans Wurmb) shoot biomass
Provedor de dados: 69
Autores: Wankasi,Donbebe; Horsfall Jnr,Michael; Ibuteme Spiff,Ayabaemi.
The sorption kinetics of Pb2+ and Cu2+ ions in aqueous solution by unmodified and mercaptoacetic acid modified biomass of Nypa fruticans shoot has been investigated. The equilibrium sorption capacity of Pb2+ and Cu2+ was determined from the Langmuir equation and found to be 15.59 mg/g and 21.85 mg/g for unmodified biomass and 52.86 mg/g and 66.71 mg/g for modified biomass at 30&amp;ordm;C. The time dependent studies showed relatively rapid sorption of 5 - 10 min to reach equilibrium for both metal ions. A batch sorption model, based on the assumption of the pseudo-second-order mechanism, was applied to predict the rate constants (g mg-1 min-1), which were found to be 3.59 x 10-4 (Pb2+) and 1.85 x 10-4 (Cu2+) and 2.82 x 10-2 (Pb2+) and 3.67 x 10-2 (Cu2+) on...
Tipo: Journal article
Palavras-chave: Adsorption; Heavy metal binding; Nipah palm.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500015

Lipase production and growth modeling of a novel thermophilic bacterium: Aneurinibacillus thermoaerophilus strain AFNA
Provedor de dados: 69
Autores: Ebrahimpour,Afshin; Rahman,Raja Noor Zaliha Raja Abd; Kamarudin,Nor Hafizah Ahmad; Basri,Mahiran; Salleh,Abu Bakar.
Aneurinibacillus thermoaerophilus strain AFNA as a novel isolated extracellular thermostable organic solvent tolerant lipase producing bacterium was employed in the present study. The lipase production of strain AFNA and its correlation with bacterial growth was studied via a modeling assessment by response surface methodology (RSM) and artificial neural network (ANN) techniques. The best achieved models were multilayer full feed forward incremental back propagation network and modified cubic response surface model (mRSM) using backward elimination. The highest lipase specific activity (13.1 Umg-1) and bacterial growth (OD600 = 3.0) were obtained at technically similar: growth temperature (53 and 53ºC), inoculum size (2.6 and 3.0%), agitation rate (118 and...
Tipo: Journal article
Palavras-chave: Artificial neural network; Modified response surface methodology; Thermostable; Organic solvent tolerant.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400006

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

The role of Mn++ ions for high and consistent yield of citric acid in recycling fed-batch bioreactor system and its novelty on kinetic basis
Provedor de dados: 69
Autores: Ali,Sikander; ul-Haq,Ikram; Iqbal,Javed.
The present investigation deals with a novel technique for high and consistent yield of citric acid in a fed-batch bioreactor of 9-L working volume. Five different potent cultures of Aspergillus niger were evaluated for citrate production using clarified cane-molasses as basal substrate. Among the cultures, NG GCB101 (developed by UV/chemical mutation in our labs) gave maximum production of citric acid i.e., 87.98 g/l after 6 days of mycelial inoculation. The values of kinetic parameters such as substrate consumption and product formation rates revealed the hyperproducibility of citric acid by selected Aspergillus niger NG GCB101 (LSD = 0.456, HS). The addition of MnSO4 to the culture medium promoted the formation of small rounded fluffy pellets (1.55 mm²,...
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000200005

Insecticidal effects of plant extracts on immature whitefly Bemisia tabaci Genn. (Hemiptera: Aleyroideae)
Provedor de dados: 69
Autores: Cruz-Estrada,Angel; Gamboa-Angulo,Marcela; Borges-Argáez,Rocío; Ruiz-Sánchez,Esaú.
Background: The whitefly (Bemisia tabaci Genn.) is a widely distributed and highly harmful plant pest species. The management of B. tabaci has been typically carried out by chemical pesticides. In the last decade however, there has been an increasing interest in natural products, particularly those of plant origin, to control this pest species. In the present work, aqueous and ethanolic extracts of native plants from the flora of the Yucatán peninsula (Acalypha gaumeri, Annona squamosa, Carlowrightia myriantha, Petiveria alliaceae and Trichilia arborea) and the introduced plant Azadirachta indica were collected and evaluated for insecticidal activity against eggs and nymphs Bemisia tabaci. Results: Most of the aqueous and ethanolic extracts showed high...
Tipo: Journal article
Palavras-chave: Annona squamosa; Bemisia tabaci; Botanical insecticides; Plant extracts; Petiveria alliaceae.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000100006

Molecular cloning and expression analysis of 12-oxophytodienoate reductase cDNA by wounding in Solanum tuberosum
Provedor de dados: 69
Autores: Díaz,Mauricio; Polanco,Victor; Ramírez,Ingrid; Peña-Cortés,Hugo.
Jasmonic acid (JA) and 12-oxophytodienoic acid (OPDA) are signal molecules involved in the stress and defense responses in plants. A full-length cDNA clon of OPR3 encoding 12-oxophytodienoate reductase 3, key enzyme involved in the biosynthesis of JA from linolenic acid was obtained from a Solanum tuberosum cDNA library. Sequence analysis showed that OPR3 encoded a polypeptide of 400 amino acids with a predicted molecular mass of 43.9 kDa and pI of 7.72. The deduced amino acid sequence of OPR3 showed high similarities to other 12-oxophytodienoate reductases. A peroxisomal signal sequence indicates OPR3 probable location in peroxisome. Levels of OPR3 mRNA accumulated in potato leaves reaching maximum levels within 1 hr of mechanical wounding. Elevated...
Tipo: Journal article
Palavras-chave: 12-oxophytodienoate reductase; Jasmonic acid; OPDA; Solanum tuberosum; Stress; Wounding.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100010

Isolation and characterization of the tissue and development-specific potato snakin-1 promoter inducible by temperature and wounding
Provedor de dados: 69
Autores: Almasia,Natalia I; Narhirñak,Vanesa; Hopp,H. Esteban; Vazquez-Rovere,Cecilia.
Snakin-1 (StSN1) is a broad-spectrum antimicrobial peptide isolated from Solanum tuberosum. Homologous proteins have been identified in a wide range of species but there is no apparent consensus in the roles they play. A 1394 bp fragment of the 5&amp;#8217;upstream region of StSN1 gene, designated PStSN1, was isolated from the potato genome and sequenced. Bioinformatics analyses revealed a total of 55 potential regulatory motifs related to tissue-specificity, stress, defence and hormone responsiveness, among others. PStSN1 spatial and temporal activity was studied in transgenic Arabidopsis plants expressing a reporter gene under this promoter control (PStSN1::GUS). Histochemical staining revealed PStSN1::GUS expression in the root vasculature, cotyledons,...
Tipo: Journal article
Palavras-chave: Antimicrobial peptide; Inducible promoter; Potato; Snakin/GASA.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500008

Expression of bacterial genes in transgenic tobacco: methods, applications and future prospects
Provedor de dados: 69
Autores: Jube,Sandro; Borthakur,Dulal.
Tobacco is the most commonly used plant for expression of transgenes from a variety of organisms, because it is easily grown and transformed, it provides abundant amounts of fresh tissue and has a well-established cell culture system. Many bacterial proteins involved in the synthesis of commercial products are currently engineered for production in tobacco. Bacterial enzymes synthesized in tobacco can enhance protection against abiotic stresses and diseases, and provide a system to test applied strategies such as phytoremediation. Examples of bacterial gene expression in tobacco include production of antigen proteins from several human bacterial pathogens as vaccines, bacterial proteins for enhancing resistance against insects, pathogens and herbicides,...
Tipo: Journal article
Palavras-chave: Biotechnology; Environmental stress; Insect/pathogen/herbicide resistance; Phytoremediation; Transgenics; Vaccine production.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300013

Supercritical fluid CO2 extraction of essential oil from Marchantia convoluta: global yields and extract chemical composition
Provedor de dados: 69
Autores: Xiao,Jian Bo; Chen,Jing Wen; Xu,Ming.
The essential oil of Marchantia convoluta was obtained by supercritical (carbon dioxide) extraction using methanol as a modifier. Global yields were determined according to the orthogonal design. The effects of different parameters, such as pressure, temperature, modifier volume and extraction time, on the supercritical fluid extraction (SFE) of essential oil from M. convoluta were investigated. Maximum global yields were obtained using the following conditions: extraction temperature, 35ºC; dynamic time, 35 min; pressure, 15 Mpa and modifier volume, 40 mL. The essential oil extract was analyzed by capillary gas chromatography with mass spectrometric detector (GC-MS). The compounds were identified according to their retention indices and mass spectra (EI,...
Tipo: Journal article
Palavras-chave: GC-MS; Supercritical fluid extraction; Yields.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100013

Rapid automated selection of mammalian cell line secreting high level of humanized monoclonal antibody using Clone Pix FL system and the correlation between exterior median intensity and antibody productivity
Provedor de dados: 69
Autores: Dharshanan,Suba; Chong,Heilly; Hung,Cheah Swee; Zamrod,Zulkeflie; Kamal,Nazlee.
The selection of high-producing mammalian cell lines is a crucial step in process development for the production of biopharmaceuticals. Previously, cloning by limiting dilution method was used to isolate monoclonal NS0 cells secreting high levels of humanized-C2 monoclonal antibodies. However limiting dilution method is time consuming, has low probability of monoclonality and is significantly limited by the number of clones that can be feasibly screened. In order to minimize the duration and to increase the probability of obtaining high-producing clones with high monoclonality, an automated colony picker, Clone Pix FL system was used to replace limiting dilution method. We were able to screen 1 x 10(5) clones secreting humanized monoclonal antibodies and...
Tipo: Journal article
Palavras-chave: Cancer immunotherapy; High producer cell line; High-throughput selection; NS0 cells; Semi-solid media.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200008

Oxygen and temperature effect on continuous citric acid secretion in Candida oleophila
Provedor de dados: 69
Autores: Anastassiadis,Savas; Rehm,Hans-Jürgen.
The influence of air saturation and temperature on continuous citric acid secretion was studied in chemostat cultures of Candida oleophila ATCC 20177 (var.). Simultaneous measurements of intra- and extracellular concentration of glucose, citric and isocitric acid confirmed the involvement of a specific active transport system in citrate secretion, favouring citric acid over isocitrate. An optimum air oxygen saturation of 20% and temperature of 30-31&amp;ordm;C were determined for the continuous citric acid secretion. The highest values of citric acid concentration (98 g/L), citrate to isocitrate ratio (33.3:1), volumetric citric productivity (1.8 g/(L x h)), and specific citric acid productivity (0.1 g/(g x h)), were reached at 20% air saturation at a...
Tipo: Journal article
Palavras-chave: Candida oleophila; Citric acid; Citric acid secretion.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400010

Measuring b-Galactosidase activity at pH 6 with a differential pH sensor
Provedor de dados: 69
Autores: Acevedo,Cristian; Stach,Matthias H; Amtmann,Anette; Young,Manuel E; Reyes,Juan G; Huebner,Holger; Buchholz,Rainer.
The b-Galactosidase activity at pH 6 is used as a cellular marker to identify senescent cell cultures. The classic method to identify this enzymatic activity is using cytochemical staining with X-Gal after 16 hrs. In this work, a differential pH sensor was used to measure b-Galactosidase activity at pH 6. The measurement is easy and only takes 3 min.
Tipo: Journal article
Palavras-chave: B-Galactosidase; Delta milli pH; Differential pH.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200012

Isolation and regeneration of transiently transformed protoplasts from gametophytic blades of the marine red alga Porphyra yezoensis
Provedor de dados: 69
Autores: Takahashi,Megumu; Uji,Toshiki; Saga,Naotsune; Mikami,Koji.
Despite the recent progress of transient gene expression systems in a red alga Porphyra yezoensis by particle bombardment, a stable transformation system has yet to establish in any marine red macrophytes. One of the reasons of the difficulty in genetic transformation in red algae is the lack of systems to select and isolate transformed cells from gametophytic blades. Thus, toward the establishment of the stable transformation system in P. yezoensis, we have developed a procedure by which transiently transformed gametophytic cells were prepared from particle bombarded-gametophytic blade as regeneratable protoplasts. Using mixture of marine bacterial enzymes, yield of protoplasts was high as reported elsewhere; however, these protoplasts did not develop. In...
Tipo: Journal article
Palavras-chave: Allantoin; Protoplast; P. yezoensis; Regeneration; Transient gene expression.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000200008

Isolation and study of a ubiquitously expressed tomato pectin methylesterase regulatory region
Provedor de dados: 69
Autores: Tiznado-Hernández,Martín-Ernesto; Gaffe,Joel; Handa,Avtar K.
Pectin methylesterase (PME) is an enzyme located in the plant cell wall of higher plants whose physiological role is largely unknown. We had isolated a PME gene from a tomato genomic library, including 2.59 kb of 5´ flanking region and the coding region. Both coding and promoter region were sequenced and computer analyzed. Tobacco transgenic plants were created harboring constructs in which 2.596 Kb, 1.306 Kb and 0.267 Kb sizes of the promoter were driving the expression of &amp;#946;-Glucuronidase gene (GUS). GUS activity was studied by histochemical and fluorometric assays. Two introns of 106 and 1039 bp were found in the coding region and phylogenetic analysis placed this PME gene closer to genes from Citrus sinensis and Arabidopsis thaliana than tomato...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100004

Expression analysis of vasa in Asian paddle crab (Charybdis japónica) exposed to Bisphenol A
Provedor de dados: 69
Autores: Chen,Jianhua; Wang,Cuihua; Gao,Huan; Yan,Binlun.
Background: Bisphenol A (BPA) is an endocrine-disrupting chemical (EDC) with a weak estrogen-like activity in fish that is found ubiquitously in aquatic environments. However, there has been little study about BPA on the endocrine disrupting effects of crab. In the present study, cDNA of vasa was cloned and characterized in the Charybdis japonica. Histological structures of testis and expression patterns of vasa gene in the testis of C. japonica after treatment with BPA were investigated. Results: The cDNA of vasa is composed of 3051 bp with a 2166 bp open reading frame encoding 721 AA. The deduced amino acid sequence contained eight conserved domains of the DEAD-box protein family. The tissue distribution showed that vasa mRNA was specifically expressed...
Tipo: Journal article
Palavras-chave: Aquatic environments; BPA; DEAD-box; Endocrine disrupting; Expression analysis; Expression patterns; Histological observation; Vasa; Vasa cDNA; Vasa gene; Vasa mRNA.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600008

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

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

Heterologous expression, purification and refolding of an anti-listerial peptide produced by Pediococcus acidilactici K7
Provedor de dados: 69
Autores: Halami,Prakash M; Chandrashekar,Arun.
The fusion protein, 6XHis-Xpress-PedA was constructed and expressed in Escherichia coli BL21 (DE3). The presence of a 12.8 kDa recombinant protein, localized in inclusion bodies (IBs) at high concentration, was confirmed by SDS-PAGE analysis and by western blotting using anti-His antibody. The rec-pediocin was purified by Nickel-nitrilotriacetic acid beads and refolded using 5 mM of &amp;#946;-mercaptoethanol along with 1 M glycine. Results indicated that the refolded rec-pediocin had an early elution profile in the RP-HPLC when compared to the unfolded protein and it exhibited biological activity against Listeria monocytogenes V7 which was approximately 25 times less active compared to native counterpart. The final yield of purified rec-pediocin was 3...
Tipo: Journal article
Palavras-chave: Fusion protein; Inclusion bodies; In vitro refolding; Pediocin PA-1; Pediococcus acidilactici; RP-HPLC.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000400009

The effect of three plant bioregulators on pollen germination, pollen tube growth and fruit set in almond [Prunus dulcis (Mill.) D.A. Webb] cvs. Non Pareil and Carmel
Provedor de dados: 69
Autores: Maita,Segundo; Sotomayor,Carlos.
Background In commercial almond [Prunus dulcis (Mill.) D.A. Webb] orchards in Chile, the percentage of fruit set is low and commonly reaches 5–30%. As almond trees bloom during a cool period and also suffer from self-incompatibility, any factor that can improve pollination, pollen germination and pollen tube growth or extend the effective pollination period, such as the application of plant bioregulators (PBRs), should be beneficial for fruit production. Results Three plant bioregulators (PBRs): brassinolide (BL), gibberellic acid (GA3) and kinetin (KN) were evaluated for pollen germination and pollen tube growth in vitro, as well as for fruit set in almond cultivars Non Pareil and Carmel, in central Chile, during the 2013 and 2014 seasons. For pollen...
Tipo: Journal article
Palavras-chave: Fruit set; Plant bioregulators; Pollen germination; Pollen tube growth; Prunus dulcis.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500010

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

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

The relationship among knowledge of, attitudes toward and acceptance of genetically modified organisms (GMOs) among Slovenian teachers
Provedor de dados: 69
Autores: Sorgo,Andrej; Ambrozis-Dolinsek,Jana.
The objective of this study was to investigate knowledge about, opinions on and attitudes toward and finally readiness to accept genetically modified organisms (GMO) among Slovenian teachers. On average, they have higher levels of knowledge in classical genetics, and poor levels of knowledge about modern issues in biotechnology, and their attitudes toward GMOs are not extreme. They make decisions based on the acceptability of a particular GMO and not on GMOs in general, following two patterns: genetic modifications (GM) microorganisms and plants are more acceptable than animals, and GMOs are more acceptable if they can not be used directly for consumption and produce something recognized as useful. The relationship among knowledge of, attitudes towards and...
Tipo: Journal article
Palavras-chave: Acceptance; Attitudes; Biotechnology; Education; Genetically modified organisms; Knowledge.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400001

Production of cold-adapted cellulase by Verticillium sp. isolated from Antarctic soils
Provedor de dados: 69
Autores: Wang,Nengfei; Zang,Jiaye; Ming,Kaili; Liu,Yu; Wu,Zuohao; Ding,Hui.
Background: Cellulose can be converted to ethanol by simultaneous saccharification and fermentation (SSF). The difference between the optimal temperature of cellulase and microbial fermentation, however, has been identified as the critical problem with SSF. In this study, one fungal strain (AnsX1) with high cellulase activity at low temperature was isolated from Antarctic soils and identified as Verticillium sp. by morphological and molecular analyses. Results: The biochemical properties of crude AnsX1 cellulase samples were studied by filter paper cellulase assay. The maximum cellulase activity was achieved at low temperature in an acidic environment with addition of metal ions. Furthermore, AnsX1 cellulase demonstrated 54-63% enzymatic activity at...
Tipo: Journal article
Palavras-chave: Antarctic soil; Cellulose; Filter paper cellulase assay; Psychrotrophic fungi; Verticillium sp.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400010

Human sulfatase transiently and functionally active expressed in E. coli K12
Provedor de dados: 69
Autores: Poutou-Piñales,Raúl A; Vanegas Niño,Adriana; Landázuri,Patricia; Sáenz,Homero; Lareo,Leonardo; Echeverri Peña,Olga Yaneth; Barrera Avellaneda,Luis A.
The recombinant human iduronate 2-sulfate sulfatase (hrIDS) was transiently and functionally active expressed in E. coli K12. The enzyme activity (crude extract) at 100 ml and 400 ml oscillated between 0.25 and 10.58 nmol h-1 mg-1. The wide Western-blot peptide profile suggest that hrIDS is proteolitically processed “randomly” which agrees with the ultrafiltration assay in which the hrIDS activity was found in all fractions (&lt;30kDa, 30-100kDa and &gt;100kDa). No glycation sites were found by computer analysis of the hIDS sequence; discarding the possibility of marks for glycation and proteolytic processing.
Tipo: Journal article
Palavras-chave: E. coli; Glycation; Human sulfatase; Transient expression.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300005

In vitro biocontrol activity of Trichoderma harzianum on Alternaria alternata in the presence of growth regulators
Provedor de dados: 69
Autores: Roco,Angela; Pérez,Luz María.
The in vitro biocontrol ability of Trichoderma harzianum on the phytopathogen Alternaria alternata improved in the presence of the growth regulators gibberellic acid (GA3), or indolacetic acid (IAA) or benzylaminopurine (BAP) or foliar nutrient at concentrations similar or higher than those used at the field level. These plant hormones decreased the secretion of endopolygalacturonase (endo-PG) of A. alternata by approximately 20%, did not modify endochitinase (endo-CH) secretion of T. harzianum and did not alter germination of conidia or mycelia growth of any of these fungi. The presence of T. harzianum decreased endo-PGase secretion of A. alternata by about 50%. This inhibitory effect was independent of the presence of growth regulators. The level of...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200006

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

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

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

Improved calibration of a solid substrate fermentation model
Provedor de dados: 69
Autores: Sacher,Johannes; Saa,Pedro; Cárcamo,Martín; López,Javiera; Gelmi,Claudio A; Pérez-Correa,Ricardo.
Background: Calibration of dynamic models in biotechnology is challenging. Kinetic models are usually complex and differential equations are highly coupled involving a large number of parameters. In addition, available measurements are scarce and infrequent, and some key variables are often non-measurable. Therefore, effective optimization and statistical analysis methods are crucial to achieve meaningful results. In this research, we apply a metaheuristic scatter search algorithm to calibrate a solid substrate cultivation model. Results: Even though scatter search has shown to be effective for calibrating difficult nonlinear models, we show here that a posteriori analysis can significantly improve the accuracy and reliability of the estimation....
Tipo: Journal article
Palavras-chave: Gibberella fujikuroi; Gibberellic acid; Global optimization; Metaheuristics; Nonlinear dynamic models; Parameter estimation; Solid substrate cultivation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000500007

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

Statistical optimization of thermo-alkali stable xylanase production from Bacillus tequilensis strain ARMATI
Provedor de dados: 69
Autores: Khusro,Ameer; Kannan Kaliyan,Barathi; Abdullah Al-Dhabi,Naif; Valan Arasu,Mariadhas; Agastian,Paul.
Background: Xylanase from bacteria finds use in prebleaching process and bioconversion of lignocelluloses into feedstocks. The xylanolytic enzyme brings about the hydrolysis of complex biomolecules into simple monomer units. This study aims to optimize the cellulase-free xylanase production and cell biomass of Bacillus tequilensis strain ARMATI using response surface methodology (RSM). Results: Statistical screening of medium constituents and the physical factors affecting xylanase and biomass yield of the isolate were optimized by RSM using central composite design at N = 30, namely 30 experimental runs with 4 independent variables. The central composite design showed 3.7 fold and 1.5 fold increased xylanase production and biomass yield of the isolate...
Tipo: Journal article
Palavras-chave: Bacillus tequilensis; Biomass; Central composite design; RSM; Xylanase.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000400003

Marine Biotechnology Opportunities for Latin America
Provedor de dados: 69
Autores: Halvorson,Harlyn O.; Chavez-Crooker,Pamela; Diaz,Paula; Quezada,Fernando.
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200003

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

One-step, codominant detection of imidazolinone resistance mutations in weedy rice (Oryza sativa L.)
Provedor de dados: 69
Autores: Rosas,Juan E; Bonnecarrère,Victoria; Pérez de Vida,Fernando.
Background Weedy rice (Oryza sativa L.) is a noxious form of cultivated rice (O. sativa L.) associated with intensive rice production and dry seeding. A cost-efficient strategy to control this weed is the Clearfield rice production system, which combines imidazolinone herbicides with mutant imidazolinone-resistant rice varieties. However, imidazolinone resistance mutations can be introgressed in weedy rice populations by natural outcrossing, reducing the life span of the Clearfield technology. Timely and accurate detection of imidazolinone resistance mutations in weedy rice may contribute to avoiding the multiplication and dispersion of resistant weeds and to protect the Clearfield system. Thus, highly sensitive and specific methods with high throughput...
Tipo: Journal article
Palavras-chave: Clearfield rice; DNA-based resistance diagnosis; Herbicide resistance; KASP; Red rice; SNP.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000200007

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

Micro-scale surface-patterning influences biofilm formation
Provedor de dados: 69
Autores: Kappell,Guimel M; Grover,James P; Chrzanowski,Thomas H.
The formation of biofilms on indwelling/implanted medical devices is a common problem. One of the approaches used to prevent biofilm formation on medical devices is to inhibit bacterial attachment by modification of the synthetic polymers used to fabricate the device. In this work, we assessed how micro-scale features (patterns) imprinted onto the surface of silicone elastomer similar to that used for medical applications influenced biofilm formation by Staphylococcus aureus, Staphylococcus epidermidis, and Pseudomonas aeruginosa. Patterns were transferred from a multi-patterned oxidized silicon-wafer master-template to silicone elastomer. Features consisted of bars, squares, and circles each extending 0.51 µm above the surface. Feature sizes ranged...
Tipo: Journal article
Palavras-chave: Indwelling medical devices; Infections; Surface attachment.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300010

The effect of protective ingredients on the survival of immobilized cells of Streptococcus thermophilus to air and freeze-drying
Provedor de dados: 69
Autores: Champagne,Claude P.; Gardner,Nancy J.
Streptococcus thermophilus cultures were grown either on trehalose or lactose, immobilized in alginate beads, dipped in various protective solutions and dried by either convection air-drying (CAD) or freeze-drying (FD). Immobilized cultures dipped in the 0.1% peptone solution did not show good survival to CAD or FD, as mortality was over 99%. There was no significant difference in mortality levels, in both methods of drying, when lactose or trehalose were used as protective ingredients. The highest survival levels (50 to 98%) were with a whey-sucrose protective medium, but this was potentially related to a higher pH and solids of the solution. Mortality levels were higher in FD than CAD, and this did not appear to be related to the fact that FD cultures...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000300009

Production of recombinant enzymes of wide use for research
Provedor de dados: 69
Autores: Manzur,María J.; Muñoz,Rosana V.; Lucero,Adrián A.; Juri Ayub,Maximiliano; Alvarez,Sergio E.; Ciuffo,Gladys M.
For biotechnological purposes, protein expression refers to the directed synthesis of large amounts of desired proteins. The aim of the present work was to produce reverse transcriptase Moloney murine Leukaemia Virus retro-transcriptase and Taq DNA polymerase, as bioactive products. In the present paper, we report the preparation of recombinant enzymes, expressed in E. coli strains. The enzymes produced exhibited quite good activity, compared with commercial enzymes, allowing us to replace the last ones for several lab applications. We are reporting changes and modifications to standard protocols described. The standard protocols were modified, i.e. for the purification step of Taq, a temperature dependent procedure was designed. The enzymes produced were...
Tipo: Journal article
Palavras-chave: Bioactivity; Protein expression; Purification; Recombinant enzymes.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300023

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

Lead biosorption onto waste beer yeast by-product: a means to decontaminate effluent generated from battery manufacturing industry
Provedor de dados: 69
Autores: Parvathi,Krishnakumar; Nagendran,Ramachandramurthy; Nareshkumar,Radhakrishnan.
This paper projects the potential of waste beer yeast Saccharomyces cerevisiae in biosorbing lead from battery manufacturing industrial effluent. Experiments were carried out as a function of pH, biosorbent concentration, lead concentration and agitation speed. Specific lead uptake of 2.34 mg/g was recorded and the data gave good fits for Freundlich and Langmuir models with Kf and Qmax values of 0.5149 and 55.71 mg/g. The roles played by amines, carboxylic acids, phosphates, sulfhydryl group and lipids in lead biosorption were studied. Electrostatic attraction may be the mechanism of biosorption. The extent of contribution of the functional groups and lipids to lead biosorption was in the order: carboxylic acids &gt; lipids &gt; amines &gt; phosphates....
Tipo: Journal article
Palavras-chave: Biosorption; Electrostatic attraction; Freundlich; Langmuir; Functional group; Lead; Yeast.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100009

Plumbagin production by root cultures of Plumbago rosea
Provedor de dados: 69
Autores: Panichayupakaranant,Pharkphoom; Tewtrakul,Supinya.
Root cultures of Plumbago rosea Linn. were established from young leaf explants on solid Gamborg's B5 (B5) medium supplemented with the combination of &lt;FONT FACE=Symbol&gt;á&lt;/FONT&gt;-naphthalene acetic acid (NAA) and kinetin in the concentration ranges of 0.5-2.0 mg/l and 0.1-0.5 mg/l, respectively. The production of plumbagin, determined by TLC-densitometry was higher [0.016 ± 0.0030% dry weight (DW)] in cultured roots obtained from B5 medium supplemented with 1.0 mg/l NAA and 0.1 mg/l kinetin. Plant selection increased the plumbagin production to 0.129 ± 0.0139% DW, while variation of sucrose and nitrogen (as (NH4)2SO4) concentration in B5 media slightly increase the plumbagin synthesis to 0.023 ± 0.0017 and 0.020 ± 0.0015% DW, respectively.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300006

Optimization of Bacillus subtilis cell growth effecting jiean-peptide production in fed batch fermentation using central composite design
Provedor de dados: 69
Autores: Zhong,Juan; Zhang,Xiaoyong; Ren,Yanli; Yang,Jie; Tan,Hong; Zhou,Jinyan.
Background Optimization of nutrient feeding was developed to improve the growth of Bacillus subtilis in fed batch fermentation to increase the production of jiean-peptide (JAA). A central composite design (CCD) was used to obtain a model describing the relationship between glucose, total nitrogen, and the maximum cell dry weight in the culture broth with fed batch fermentation in a 5 L fermentor. Results The results were analyzed using response surface methodology (RSM), and the optimized values of glucose and total nitrogen concentration were 30.70 g/L and 1.68 g/L in the culture, respectively. The highest cell dry weight was improved to 77.50 g/L in fed batch fermentation, which is 280% higher than the batch fermentation concentration (20.37 g/L). This...
Tipo: Journal article
Palavras-chave: Bacillus subtilis ZK8; Iturin A; Response surface methodology.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000300005

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

Statistical optimization for tannase production by Aspergillus tubingensis in solid-state fermentation using tea stalks
Provedor de dados: 69
Autores: Xiao,Anfeng; Huang,Yufeng; Ni,Hui; Cai,Huinong; Yang,Qiuming.
Background A sequential statistical strategy was used to optimize tannase production from Aspergillus tubingensis using tea stalks by solid-state fermentation. Results First, using a Plackett-Burman design, inoculum size and incubation time (among seven tested variables) were identified as the most significant factors for tannase yield. The effects of significant variables were further evaluated through a single steepest ascent experiment and central composite design with response surface analysis. Under optimal conditions, the experimental value of 84.24 units per gram of dry substrate (U/gds) closely matched the predicted value of 87.26 U/gds. Conclusions The result of the statistical approach was 2.09 times higher than the basal medium (40.22 U/gds)....
Tipo: Journal article
Palavras-chave: Aspergillus tubingensis; Process optimization; Response surface methodology; Tea stalks; Tannase fermentation.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000300001

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

The lift pool method for isolation of cDNA clones from lambda phage libraries
Provedor de dados: 69
Autores: LeBlanc-Straceski,Janine; Sobrado,Pablo; Betz,Sharon; Zerfas,Julie; Morgan,Karen.
A PCR based strategy was developed to screen a Xenopus oocyte &amp;lambda;gt10 cDNA library. The PCR-based lift pool (LP) method follows the same two tiered strategy as conventional screening of phage libraries by filter hybridization. Two rounds of plating, one at high density to detect the clone, and one at low density to purify the clone to homogeneity, are performed. In the first round, lysates from high density plates, termed plate pools (PP), serve as template for PCR. In the second round, phage particles adhering to plaque lifts of low density plates are washed off nitrocellulose filters to create LPs, which are used as template for PCR. The integrity of the plaques on the low-density plates is preserved. Once a positive LP has been identified,...
Tipo: Journal article
Palavras-chave: CDNA; Lambda; Non-radioactive; PCR; Plaque; Screening.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400012

Effect of malate on docosahexaenoic acid production from Schizochytrium sp. B4D1
Provedor de dados: 69
Autores: Zhanga,Yong; Min,Qingsong; Xu,Jian; Zhang,Ke; Chen,Shulin; Wang,Haijun; Li,Demao.
Background: Malate involves in the citrate/malate and transhydrogenase cycles to provide precursors for docosahexaenoic acid (DHA) synthesis. The optimal strategy was investigated for increasing DHA production in Schizochytrium species during fermentation. Results: DHA production increased by 47% and reached 5.51 g/L when 4 g malate/L was added during the rapid lipid accumulation stage in shake-flasks culture. Inducing effects of malate was further investigated through the analysis of three kinetic parameters, including specificcell growth rate(&amp;#956;), specific glucose consumption rate (qGlu)and DHA formation rate (qDHA). DHA concentration was enhanced through a novel fed-batch strategy to a maximum value of 30.7 g/L, giving a yield of 0.103 g DHA/g...
Tipo: Journal article
Palavras-chave: DHA; Malate; NADPH; Schizochytrium sp.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100009

Fast and reliable calibration of solid substrate fermentation kinetic models using advanced non-linear programming techniques
Provedor de dados: 69
Autores: Araya,M. Macarena; Arrieta,Juan J; Pérez-Correa,J. Ricardo; Biegler,Lorenz T; Jorquera,Héctor.
Calibration of mechanistic kinetic models describing microorganism growth and secondary metabolite production on solid substrates is difficult due to model complexity given the sheer number of parameters needing to be estimated and violation of standard conditions of numerical regularity. We show how advanced non-linear programming techniques can be applied to achieve fast and reliable calibration of a complex kinetic model describing growth of Gibberella fujikuroi and production of gibberellic acid on an inert solid support in glass columns. Experimental culture data was obtained under different temperature and water activity conditions. Model differential equations were discretized using orthogonal collocations on finite elements while model calibration...
Tipo: Journal article
Palavras-chave: Dynamic models; Gibberellic acid; Nonlinear models; Parameter estimation; Secondary metabolites; Solid substrate cultivation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100005

Gene expression of specific enological traits in wine fermentation
Provedor de dados: 69
Autores: Martínez,Claudio; García,Verónica; González,David; Jara,Matías; Aguilera,Matías; Ganga,Maria Angélica.
Background: Wine fermentation is a dynamic process and yeast has a precise genic regulation system that allow them to coordinate the gene transcription levels. However, the fermentation stage at which there is a great variation in the genic expression associated to a particular enological trait is often unknown and there are no simple experimental approaches to define it. Results: To identify the most adequate stage in which to evaluate the expression of the genes associated to specific enological traits we identified three stages of fermentation using the industrial strain EC1118. These stages, called early (0-16.4 hrs), middle (16.4-88.7 hrs) and late (88.7 hrs onwards), were characterized according to changes in the speed of CO2 production. The greatest...
Tipo: Journal article
Palavras-chave: Enological traits; Gene expression; Saccharomyces cerevisiae; Wine fermentation; Wine yeast.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400013

Isolation and characterization of a novel (S)-canadine synthase gene from Coptis chinensis
Provedor de dados: 69
Autores: He,Yang; Hou,Pei; Fan,Gang; Li,Dongmei; Peng,Cheng.
Background Berberine acts primarily as an important active ingredient in Coptis chinensis and has been traditionally applied in clinical treatment. Nevertheless, little information has been released about C. chinensis, as far as functional genes and biosynthetic pathway of berberine are concerned. Here, we isolated a novel (S)-canadine synthase gene (designated as CAS-1) from C. chinensis by using RT-PCR and RACE techniques. Results Bioinformatics analysis showed that the cDNA is 1942 bp in length with a complete open reading frame (ORF) of 1476 bp, and the ORF encodes a polypeptide of 491 amino acids with a calculated molecular mass of 55.29 kDa and a pI value of 8.92. Real-time quantitative PCR analysis showed that CcCAS-1 was constitutively expressed in...
Tipo: Journal article
Palavras-chave: Berberine biosynthesis; Coptis chinensis; Expression pattern.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000500009

RestrictionDigest: A powerful Perl module for simulating genomic restriction digests
Provedor de dados: 69
Autores: Wang,Jinpeng; Li,Li; Qi,Haigang; Du,Xuedi; Zhang,Guofan.
Background: Reduced-representation sequencing technology is widely used in genotyping for its economical and efficient features. A popular way to construct the reduced-representation sequencing libraries is to digest the genomic DNA with restriction enzymes. A key factor of this method is to determine the restriction enzyme(s). But there are few computer programs which can evaluate the usability of restriction enzymes in reduced-representation sequencing. SimRAD is an R package which can simulate the digestion of DNA sequence by restriction enzymes and return enzyme loci number as well as fragment number. But for linkage mapping analysis, enzyme loci distribution is also an important factor to evaluate the enzyme. For phylogenetic studies, comparison of...
Tipo: Journal article
Palavras-chave: Genotyping; Reduced-representation libraries; Reduced-representation sequencing.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300003

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

Enhancement of ligninolytic enzyme activities in a Trametes maxima-Paecilomyces carneus co-culture: Key factors revealed after screening using a Plackett-Burman experimental design
Provedor de dados: 69
Autores: Chan Cupul,Wilberth; Heredia Abarca,Gabriela; Martínez Carrera,Daniel; Rodríguez Vázquez,Refugio.
Background In the industrial biotechnology, ligninolytic enzymes are produced by single fungal strains. Experimental evidence suggests that co-culture of ligninolytic fungi and filamentous microfungi results in an increase laccase activity. In this topic, only the ascomycete Trichoderma spp. has been studied broadly. However, fungal ligninolytic-filamentous microfungi biodiversity interaction in nature is abundant and poorly studied. The enhancement of laccase and manganese peroxidase (MnP) activities of Trametes maxima as a function of time inoculation of Paecilomyces carneus and under several culture conditions using Plackett-Burman experimental design (PBED) were investigated. Results The highest increases of laccase (12,382.5 U/mg protein) and MnP...
Tipo: Journal article
Palavras-chave: Enzyme activity enhance; Fungal interaction; Paecilomyces carneus; Time inoculation; White-rot fungi.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000300002

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

Influence of medium constituents on the biosynthesis of cephalosporin-C
Provedor de dados: 69
Autores: Kumar Nigam,Vinod; Verma,Ruchi; Kumar,Abhishek; Kundu,Subir; Ghosh,Purnendu.
Acremonium chrysogenum NCIM 1069 was used for the biosynthesis of cephalosporin-C (CPC) in batch mode of cultivation. The effect of different medium constituents for better yield of CPC was thoroughly investigated. From the results of the fermentation, it was found that ammonium sulphate as inorganic nitrogen source and methionine at the concentration of 0.4% are most suitable for higher yield of antibiotic. The variation in the C/N ratio on the biosynthesis of CPC showed that a C/N ratio of 8.0 is most suitable for maximum production of CPC
Tipo: Journal article
Palavras-chave: Acremonium chrysogenum; Batch fermentation; Cephalosporin-C; Methionine; Stirred tank bioreactor.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200007

Ethylene treatment improves diosgenin accumulation in in vitro cultures of Dioscorea zingiberensis via up-regulation of CAS and HMGR gene expression
Provedor de dados: 69
Autores: Diarra,Sabake T; He,Ji; Wang,Jianbo; Li,Jiaru.
Background: The perennial medicinal herb Dioscorea zingiberensis is a very important plant used for steroid drug manufacturing for its high level of diosgenin in rhizome. Although the stimulation of diosgenin accumulation by ethylene has been reported in a few of plant species, its regulation is not yet characterized at the molecular level, the underlying molecular mechanism remains elusive. Results: In this study, the effects of ethylene on diosgenin biosynthesis in in vitro cultures of D. zingiberensis were described. The results showed that, in samples treated with ethylene at concentration E3 (10(4) dilution of 40% ethephon), the diosgenin biosynthesis was significantly promoted in comparison with the control samples. Treatment with high concentrations...
Tipo: Journal article
Palavras-chave: Diosgenin; Dioscorea zingiberensis; Ethylene; Gene expression.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500006

Heat identification by 17&amp;#946;-estradiol and progesterone quantification in individual raw milk samples by enzyme immunoassay
Provedor de dados: 69
Autores: Domènech,Anna; Pich,Sara; Arís,Anna; Plasencia,Carmen; Bach,Alex; Serrano,Alicia.
Background: There is a substantial decline in first-service-pregnancy-rate in dairy cows. In this regard, future prospects are to measure milk hormones on-farm and progesterone levels in milk are not enough to precise ovulation unless connected to other data. The objectives of this study were to investigate whether 17&amp;#946;-estradiol could be measured from individual cow milk samples using a commercially available non-radiolabelled enzyme immunoassay kit (EIA) with no previously reported milk application, and whether those detections could precisely illustrate 17&amp;#946;-estradiol pre-ovulation peak in spite of its limited concentration and short manifestation in milk. Results: Milk sample treatments for progesterone and 17&amp;#946;-estradiol EIA...
Tipo: Journal article
Palavras-chave: Cattle; Estrous; Heat; Hormone; Insemination.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400010

Identification of drought-responsive transcripts in peanut (Arachis hypogaea L.)
Provedor de dados: 69
Autores: Jain,Ashok K.; Basha,Sheikh Mehboob; Holbrook,C. Corley.
We have used a reverse transcriptase polymerase chain reaction procedure (differential display) to identify cDNAs corresponding to transcripts affected by water stress in peanuts (Arachis hypogaea L.). Using this method, we have identified several mRNA transcripts that are up- or down-regulated following water stress. With 21 primer combinations, a total of 1235 differential display products were observed in irrigated samples, compared to 950 differential display products in stressed samples. These products demonstrated qualitative and quantitative differences in the gene expression. The differentially expressed transcripts were collectively named PTRD (Peanut Transcripts Responsive to Drought). We have identified a total of 43 PTRD, which were...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200005

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

Infectious pancreatic necrosis virus (IPNV) enumeration through epifluorescence microscopy: technical aspects
Provedor de dados: 69
Autores: Pavlov,Maria Soledad; Eissler,Yoanna; Espinoza,Juan Carlos; Garland,David E; Kuznar,Juan.
A method for counting Infectious pancreatic necrosis virus (IPNV) through epifluorescence microscopy was analyzed in detail. Image processing and statistic considerations are included. The particle size of viruses was compared in different experimental conditions such as the staining of the virus with SYBR-Green I or with antibodies for specific fluorescence labeling of viral proteins. The type of surface used as mounting support was assayed as well. The results indicated that the most suitable method involves the mounting of the viral-containing suspension on a membrane filter followed by the staining with a monoclonal antibody specific for a viral protein combined with a FITC (fluorescein isothiocyanate)-conjugated secondary antibody.
Tipo: Journal article
Palavras-chave: Digital image analysis; Fluorescence microscope methods; Immunofluorescence; Infectious pancreatic necrosis virus (IPNV); SYBR-Green I.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100011

Managing agricultural biotechnology in Colombia
Provedor de dados: 69
Autores: Schuler,Ingrid; Orozco,Luis Antonio.
The international scenario for biotechnology shows a rapid tendency at industrialized countries in the increase of publications, patents, enterprises and novel solutions for the industry, the environment, health and agriculture. Nevertheless, Colombia has an important delay in relation to the international scientific development and the capacity to generate wealth and services for its productive systems. This delay has been one of the concerns of the country's policy during the last years, and more precisely since 2002, when for the first time biotechnology was included in a National Development Plan as one of the mechanisms for competitiveness and the use of biodiversity and genetic resources. This paper is the result of a survey conducted in 2005 aimed...
Tipo: Journal article
Palavras-chave: Agricultural biotechnology; Indicators; Legislation; Policies; Public perception.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300001

Production of natural and rare pentoses using microorganisms and their enzymes
Provedor de dados: 69
Autores: Ahmed,Zakaria.
Biochemical methods, usually microbial or enzymatic, are suitable for the production of unnatural or rare monosaccharides. D-Arabitol was produced from D-glucose by fermentation with Candida famata R28. D-xylulose can also be produced from D-arabitol using Acetobacter aceti IFO 3281 and D-lyxose was produced enzymatically from D-xylulose using L-ribose isomerase (L-RI). Ribitol was oxidized to L-ribulose by microbial bioconversion with Acetobacter aceti IFO 3281; L-ribulose was epimerized to L-xylulose by the enzyme D-tagatose 3-epimerase and L-lyxose was produced by isomerization of L-RI. L-ribose and L-arabinose were prepared biochemically from ribitol by oxidation using Acetobacter aceti IFO 3281 and isomerization using L-RI and L-arabinose isomerase...
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582001000200008

Funding of human stem cell research by the United States
Provedor de dados: 69
Autores: Jones,Phillip B.C.
During the fall of 1998, three research groups announced that they had devised methods for obtaining human embryonic stem cells. Human stem cells are characterized by the ability to form many cell types, and the scientific community anticipates that the cells should be useful for the treatment of a wide variety of diseases. The dilemma is that human stem cell methodology can require, at least to some extent, research with human fetal tissue or research involving human embryos. Those opposed to federal funding of the former are concerned that the studies would support the "legitimacy" of abortion, while the latter is seen as prohibited under current law. The National Bioethics Advisory Committee has suggested that the federal government should fund both...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000100003

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

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

Guava Psidium guajava seed flour and dry Aspergillus niger mycelium as nitrogen sources for the production of biomass and antimicrobial compounds produced by Weissella confusa
Provedor de dados: 69
Autores: Serna-Cock,Liliana; Mera-Ayala,José Daniel; Angulo-López,Jorge Eduardo.
Background: The fermentation substrate efficiency of glucose supplemented with guava seed flour (GGSF) or glucose supplemented with dry Aspergillus niger mycelium (GANM) was evaluated during the production of biomass and antimicrobial compounds by the lactic acid bacteria Weissella confusa. Results: The fermentation substrate efficiency was measured by comparing the biomass formation, substrate consumption, substrate conversion, antimicrobial activity and product yield. The antimicrobial activity was measured against a commercial Staphylococcus aureus strain. The results were compared against fermentations performed in a commercial substrate (CS), the MRS (Man-Rogosa-Sharpe) substrate. The fermentations were performed discontinuously for 4 hrs at 100 rpm...
Tipo: Journal article
Palavras-chave: Agroindustrial residue; Bacteriocin; Biomass; Inhibition.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600017

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

Influences of phenolic compounds on citric acid productivity by Aspergillus niger in stirred fermentor
Provedor de dados: 69
Autores: Çevrml,Bekir Stk; Karipta,Ergin; Yaar,Ahmet; Ytolu,Mustafa.
Influences of phenol, ?-naphtol and ?-naphtol, which are toxic chemicals, on citric acid biosynthesis and biomass in the artificial culture setting of Aspergillus niger using batch fermenter are examined in the most favorable fermentation conditions, and a model is proposed. Addition of certain concentrations of phenol, ?-naphtol and ?-naphtol to the culture increases the citric acid production. According to this model, maximum citric acid concentration is 48.3 g L-1 in a culture that does not contain any toxic chemicals, whereas the maximum concentrations obtained in cultures containing 25 mg L-1 phenol, 25 mg L-1 alpha-naphtol and 15 mg L-1 beta-naphtol are 62.5 g L-1, 78.1 g L-1 and 86.0 g L-1, respectively. Moreover, addition of toxic chemicals to the...
Tipo: Journal article
Palavras-chave: A. niger; Citric acid; Fermenter; Toxic chemicals (phenols).
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000600008

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

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

Morphological and chemical diversity in the Type IV glandular trichomes of Solananeae (S. sisymbrifolium and N. glauca) as germplasm resources for agricultural and food uses
Provedor de dados: 69
Autores: Cesio,Verónica; Dutra,Carmelo; Moyna,Patrick; Heinzen,Horacio.
Morphological variation in type IV trichomes in Ss and Ng was studied through SEM. The differences can be related to chemical differences in the excreted sugar esters. Ng trichomes exude two fractions, one of glucose tri-esters and the other one of sucrose tetra-esters, in a 3:7 ratio. The main acid found forming these esthers, is 3-methylvalerianic acid, in consonance to those secreted by other Solanaceae. Esters from Ss are novel structures, which can also be separated into three fractions, two of arabinoxylans, and the other one of arabinose, all glycosilated with &amp;beta;-hydroxipalmitic acid and sterified with the C12-C16 acids. All five fractions have antifungic activity at &amp;#956;g/cm² concentrations, both against common and mycotoxigenic...
Tipo: Journal article
Palavras-chave: Antifungic activity; Interespecies variability; Mycotoxins; Sugar esters.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300021

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

Effect of temperature on the anaerobic digestion of palm oil mill effluent
Provedor de dados: 69
Autores: Choorit,Wanna; Wisarnwan,Pornpan.
Two continuous stirred tank reactors (CSTRs) each fed with palm oil mill effluent (POME), operated at 37ºC and 55ºC, respectively, were investigated for their performance under varies organic loading rates (OLRs). The 37ºC reactor operated successfully at a maximum OLR of 12.25 g[COD]/L/day and a hydraulic retention time (HRT) of 7 days. The 55ºC reactor operated successfully at the higher loading rate of 17.01 g[COD]/L/day and had a HRT of 5 days. The 37ºC reactor achieved a 71.10% reduction of chemical oxygen demand (COD), a biogas production rate of 3.73 L of gas/L[reactor]/day containing 71.04% methane, whereas the 55ºC reactor achieved a 70.32% reduction of COD, a biogas production rate of 4.66 L of gas/L[reactor]/day containing 69.53% methane. An OLR...
Tipo: Journal article
Palavras-chave: Hydraulic retention times; Mesophilic reactor; Methane; Organic loading rate; Temperature variations; Thermophilic reactor; Volatile fatty acids.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300005

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

Transformation of Monascus purpureus to hygromycin B resistance with cosmid pMOcosX reduces fertility
Provedor de dados: 69
Autores: Lakrod,Kamolnan; Chaisrisook,Chulee; Skinner,Daniel Z.
Albino strain KB20M1 of Monascus purpureus was genetically transformed to hygromycin B resistance with cosmid pMOcosX, using biolistic bombardment. Conidia and mycelial fragments were used as the recipient material and rupture disk strengths of 6.2 and 9.3 MPa each yielded a transformed isolate from five bombardments. Southern analysis suggested a single copy of the cosmid had integrated into each of the transformants. Both of the independent transformants formed cleistothecia but ascospore formation was greatly reduced or absent, suggesting the integration and expression of the genes carried on pMOcosX interfered with fertilization and/or ascospore formation in this homothallic fungus.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582003000200007

Evaluation of the uniformity and stability of T-DNA integration and gene expression in transgenic apple plants
Provedor de dados: 69
Autores: Flachowsky,Henryk; Riedel,Marko; Reim,Stefanie; Hanke,Magda-Viola.
The generation of transgenic apple plants relies on the molecular analysis of transgene integration and expression based on polymerase chain reaction (PCR) analysis, blotting techniques and enzymatic assays on vitro leaves of putative transgenic regenerates. In order to assess the uniformity and the stability of transfer DNA (T-DNA) integration and gene expression, we studied 26 transgenic apple lines carrying the attacin E gene from Hyalophora cecropia, the &amp;#946;-glucuronidase gene, and the nptII gene. Plants were evaluated using standard molecular techniques, such as PCR, Southern blot, reverse transcription PCR (RT-PCR) and Enzyme Linked Immunosorbent Assay (ELISA), and propagated in vitro on non-selective antibiotic-free media for four years to...
Tipo: Journal article
Palavras-chave: Agrobacterium tumefaciens; Apple; Chimeric tissue; Gene silencing; Malus domestica; T-DNA leakage.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100003

New biotechnological applications of coconuts
Provedor de dados: 69
Autores: Bustamante,José O.
Coconut is a major crop of many poor nations. The present paper shows with inexpensive fluorescence microscopy of the enhanced green fluorescent protein (EGFP), that coconut water has the capability of synthesizing proteins from recombinant DNA vectors. After only 4 hrs of 100 pM application of the EGFP plasmid (pEGFP), a strong fluorescent signal was detected with an off-the-shelf, low-tech CCD webcam. Since natural coconut water is sterile, this heat-stable delivery system may be a good option for the dissemination of food supplements and pharmaceuticals in poor nations. As expensive substances could be expressed in coconut water, through bioreactor technology or micropropagation, the concepts presented here may prove invaluable to the economic and...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000100002

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

L (+) lactic acid fermentation and its product polymerization
Provedor de dados: 69
Autores: Narayanan,Niju; Roychoudhury,Pradip K.; Srivastava,Aradhana.
Lactic acid has been first introduced to us as early as 1780 as a sour component of milk. Ever since we have found its applications in food, pharmaceutical, cosmetic industries etc. Now there are emerging uses as a potential feedstock for the biodegradable polymer industry. The microorganisms being used for lactic acid fermentation, the raw materials reported, the various novel fermentation processes and its processing methods have been reviewed. The properties and applications of lactic acid, its derivatives and polymer have been discussed. The various routes to polymerization and the companies presently involved in lactic acid production have been covered
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582004000200008

Visualization and Functional Analysis of a Maxi-K Channel (mSlo) Fused to Green Fluorescent Protein (GFP)
Provedor de dados: 69
We have constructed a fusion protein between mSlo (a recombinant, high conductance, calcium-activated potassium channel or maxi-K), and GFP (green fluorescent protein). This construct represents a tag to not only monitor channel expression, but to locate the protein in living cells. The GFP was fused in frame to the carboxy-terminus of the mSlo core protein (mSlo-GFP fusion protein). Expression of this fusion protein in COS-7 cells resulted in robust fluorescence localized near the cell membrane. Fluorescing cells that were patch clamped exhibited whole cell currents with a direction consistent with potassium currents. Conversely, non-fluorescing cells showed no significant whole cell currents. Excised inside out patches revealed single channel currents...
Tipo: Journal article
Ano: 1999
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34581999000300003

Expression of Bacillus thuringiensis insecticidal protein gene in transgenic oil palm
Provedor de dados: 69
Autores: Lee,Mei-Phing; Yeun,Li-Huey; Abdullah,Ruslan.
Oil palm, like all other crops, is susceptible to attack from several insect pests causing significant reduction in productivity. In the past, cry genes from Bacillus thuringiensis have been reported to be effective in conferring resistance towards insect pests in crops such as corn and rice. One of the advantages of these toxin proteins is their specificity towards certain harmful insects. A rapid and efficient method was developed for the transformation and evaluation of CryIA(b) expression in oil palm. A recombinant vector was introduced into immature embryos (IEs) of oil palm via the biolistic method. More than 700 putative transformed IEs from independent transformation events were generated. Transient transformation efficiency of 81-100 % was...
Tipo: Journal article
Palavras-chave: CryIA(b) gene; Gene expression; Insect resistance; Oil palm transformation; Rapid detection system; Transgenic oil palm.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200005

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

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

Effect of jasmonic acid and aluminium on production of tropane alkaloids in hairy root cultures of Brugmansia candida
Provedor de dados: 69
Autores: Spollansky,Tatiana C.; Pitta-Alvarez,Sandra I.; Giulietti,Ana M.
Hairy root cultures of Brugmansia candida (Solanaceae), a South American plant which produces scopolamine and hyoscyamine, were exposed to different elicitors (jasmonic acid (JA) and aluminum chloride (AlCl3)) in order to increase their productivity and/or stimulate their liberation. Hairy roots of 19-day old cultures (exponential phase) were exposed to these elicitors for 24 and 48 hours. The effects on alkaloid accumulation and release into the medium were evaluated. JA was tested at 2.5 and 25 m g/ml. After 24 hours, JA promoted the release of hyoscyamine (~1200%) when the highest concentration was used. Therefore, the positive effects seen with JA could possibly be attributed in part to ethanol (EtOH), the solvent in which the acid was dissolved. At...
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582000000100006

Molecular cloning, expression pattern, and putative cis-acting elements of a 4-coumarate:CoA ligase gene in bamboo (Neosinocalamus affinis)
Provedor de dados: 69
Autores: Cao,Ying; Hu,Shang-lian; Huang,Sheng-xiong; Ren,Peng; Lu,Xue-qin.
Background: 4-coumarate:CoA ligase (4CL) plays an important role at the divergence point from general phenylpropanoid metabolism to several branch pathways. Although 4CL sin higher plants have been extensively studied, little has known about the 4CL gene of bamboo. Results: In current study, a Na4CL gene putative encoding 4-coumarate:CoA ligase (4CL) and its 5&amp;#146;-flanking region were isolated from bamboo (Neosinocalamus affinis) by RACE-PCR and genomic DNA walker, respectively. Na4CL encodes a predicted protein of 557 amino acids, with conserved motifs of adenylate-forming enzymes. Phylogenetic analysis showed that Na4CL shared 62~85% identity with other known plant 4CLs, and cluster closely with some known 4CLs in monocots. Sequence analysis...
Tipo: Journal article
Palavras-chave: Expression pattern; Neosinocalamus affinis; Promoter; RACE; RNAi.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500009

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

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

Purification and characterization of xylanases from Trichoderma inhamatum
Provedor de dados: 69
Autores: Silva,L.A.O; Terrasan,César Rafael Fanchini; Carmona,Eleonora Cano.
Background Two xylanases, Xyl I and Xyl II, were purified from the crude extracellular extract of a Trichoderma inhamatum strain cultivated in liquid medium with oat spelts xylan. Results The molecular masses of the purified enzymes estimated by SDS-PAGE and gel filtration were, respectively, 19 and 14 kDa for Xyl I and 21 and 14.6 kDa for Xyl II. The enzymes are glycoproteins with optimum activity at 50°C in pH 5.0-5.5 for Xyl I and 5.5 for Xyl II. The xylanases were very stable at 40°C and in the pH ranges from 4.5-6.5 for Xyl I and 4.0-8.0 for Xyl II. The ion Hg2+ and the detergent SDS strongly reduced the activity while 1,4-dithiothreitol stimulated both enzymes. The xylanases showed specificity for xylan, Km and Vmax of 14.5, 1.6 mg·mL-1 and 2680.2...
Tipo: Journal article
Palavras-chave: Enzyme purification; Physico-chemical properties; Trichoderma inhamatum; Xylanases.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400009

The changes of organelle ultrastructure and Ca2+ homeostasis in maize mesophyll cells during the process of drought-induced leaf senescence
Provedor de dados: 69
Autores: Ma,Yuan-Yuan; Guo,Xiu-Lin; Liu,Bin-Hui; Liu,Zi-Hui; Shao,Hong-Bo.
The changes of cell ultra structure as well as Ca2+ homeostasis involved in the drought-induced maize leaf senescence was investigated. Meanwhile, many indicatives of leaf senescence including thiobarbituric acid reactive substance (MDA), electrolyte leakage (EL), and chlorophyll along with soluble proteins were also detected during the process. The Polyethylene glycol6000(PEG6000)-incubated detached leaves showed a slight increase in the MDA content and electrolyte leakage during the first 30 min of our detection, which was corresponded to an unobvious alteration of the cell ultrastructure. Other typical senescence parameters measured in whole leaf exhibited a moderate elevation as well. Thereafter, however, the EL and MDA rose to a large extent, which...
Tipo: Journal article
Palavras-chave: Ca2+ homeostasis; Drought; Leaf senescence; Maize; Organelle ultrastructure; Signal transduction.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300004

Identification of QTLs for pod and kernel traits in cultivated peanut by bulked segregant analysis
Provedor de dados: 69
Autores: Gomez Selvaraj,Michael; Narayana,Manivannan; Schubert,A. Michael; Ayers,Jamie L; Baring,Michael R; Burow,Mark D.
Bulked segregant analysis was used to identify simple sequence repeat (SSR) markers associated with pod and kernel traits in cultivated peanut, to permit rapid selection of superior quality genotypes in the breeding program. SSR markers linked to pod and kernel traits were identified in two DNA pools (high and low), which were established using selected F2:6 recombinant individuals resulting from a cultivated cross between a runner (Tamrun OL01) and a Spanish (BSS 56) peanut. To identify quantitative trait loci (QTLs) for pod and kernel-related traits, parents were screened initially with 112 SSR primer pairs. The survey revealed 8.9% polymorphism between parents. Of ten SSR primer pairs distinguishing the parents, five (PM375, PM36, PM45, pPGPseq8D9, and...
Tipo: Journal article
Palavras-chave: Maturity; Oil quantity; Quality; SSR markers.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200003

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

Molecular characterization of a novel thermostable laccase PPLCC2 from the brown rot fungus Postia placenta MAD-698-R
Provedor de dados: 69
Autores: An,Hongde; Xiao,Tingting; Fan,Huan; Wei,Dongsheng.
Background Laccase has been considered important for the degradation of lignocellulose by wood rot fungi. The properties and functions of laccase in white rot fungi have been investigated extensively, but those from brown rot fungi remain largely unknown. In this paper, a laccase isoform Pplcc2 from the brown rot fungus Postia placenta MAD-698-R was expressed heterologously in Pichia pastoris GS115, purified and the properties of the enzyme were determined. Results The molecular weight of the protein was determined to be 67 kDa using SDS-PAGE. It cannot oxidize syringaldazine (SGZ), but it can oxidize 2,2'-azino-di-(3-ethylbenzothialozin-6-Sulfonic acid) (ABTS) and 2,6-dimethoxyphenol (DMP). Specific activity for ABTS was 1960 ± 19 Unit/mg. The catalytic...
Tipo: Journal article
Palavras-chave: Brown rot fungi; Pichia pastoris; Postia placenta; Thermostable laccase.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600011

Obtainment of embryogenic cell suspensions from scalps of the banana CIEN-BTA-03 (Musa sp., AAAA) and regeneration of the plants
Provedor de dados: 69
Autores: Ramírez-Villalobos,Maribel; de García,Eva.
The purposes of this work were to obtain embryogenic cell suspensions (ECS) from scalps and to regenerate plants of the banana CIEN-BTA-03. Shoot apexes were grown in the scalp-induction medium of Murashige and Skoog plus BA and IAA, following four diverse treatments. The first two, ME22 and ME25, were solid media supplemented with (mg L-1) 22.7 BA plus 0.192 IAA, and 25 BA plus 0.217 IAA, respectively, all containing 1.8 g L-1 of phytagel, and subcultures were performed monthly and bimonthly over 16 months. The other two treatments, IT22 and IT25, resembled ME22 and ME25 but consisted in temporary immersion for four months without subcultures, followed by two months in solid media. The scalps were grown in callus-induction medium and embryogenic calluses...
Tipo: Journal article
Palavras-chave: Bananas; Embryogenic callus; Embryogenic cell suspension; Musa sp; Plant regeneration; Scalp; Secondary somatic embryogenesis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500006

Use of volatile fatty acids salts in the production of xanthan gum
Provedor de dados: 69
Autores: Correa Leite,José Alberto; Pozzi,Eloiza; Pelizer,Lúcia Helena; Zaiat,Marcelo; Barboza,Marlei.
Background: The aim of this study was the production of xanthan gum from salts of volatile fatty acids, which can be generated in anaerobic processes for the production of hydrogen from organic wastewaters. Xanthan gum was produced with three different acid salts used to replace the traditional citrate, which is normally used in the culture for the production of this biopolymer. The volatile fatty acids (VFA) salts used were sodium acetate 0.0328 M, sodium propionate 0.0219 M, and sodium butyrate 0.0164 M. Results: The values of biomass yield, (Yp/x) obtained were 9.2 g/g for acetate, 11.78 g/g for citrate, 11.80 g/g for butyrate and 14.59 g/g for propionate, while the values of the product yield (Yp/s), were 0.92; 0.59; 0.71 and 0.72 for acetate, citrate,...
Tipo: Journal article
Palavras-chave: Rheology; Volatile fatty acids; Xanthan gum.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000200006

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

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

"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

Production of polyclonal antisera to manganese superoxide dismutase expressed in downy mildew resistant pearl millet and its application for immunodiagnosis
Provedor de dados: 69
Autores: Urs Babitha,Mysore Pandurangaraj; Madhu,Devaiah; Sripathi P,Harishchandra; Shekar Shetty,Hunthrike.
Level of superoxide dismutase (SOD) in the seedlings of downy mildew resistant pearl millet genotype (IP 18293) increased 3-fold upon inoculation with Sclerospora graminicola. Mn-SOD was purified from pearl millet by ion-exchange and gel filtration chromatography. Polyclonal antibody was raised in rabbit against Mn-SOD of pearl millet. Anti-Mn SOD had an antibody titer of 1:20,000. ELISA results revealed a 1.5-fold increase in pure Mn-SOD preparation compared to the crude preparation. The antibody reactivity as detected by ELISA revealed that Mn-SOD is higher at 4 hrs post-inoculation in resistant pearl millet seedlings. The reactivity also showed the Mn-SOD is more in roots of inoculated resistant seedlings. SOD reactivity was also determined by DIBA...
Tipo: Journal article
Palavras-chave: DIBA; Downy mildew; ELISA; Immunofluorescence; Manganese superoxide dismutase; Pearl millet; Sclerospora graminicola; Western blot.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200007

Optimal immobilization of &amp;#946;-glucosidase into chitosan beads using response surface methodology
Provedor de dados: 69
Autores: Zhou,Ying; Wang,Lufeng; Wu,Ting; Tang,Xixuan; Pan,Siyi.
Background: &amp;#946;-Glucosidase is known as an effective catalyst for the hydrolysis of various glycosides and immobilization is one of the most efficient strategies to improve its activity recovery and properties. Results: Crosslinking-adsorption-crosslinking method was employed to immobilize &amp;#946;-glucosidase into chitosan beads and response surface methodology (RSM) was used to optimize the immobilized conditions of the maximum activity recovery. Enzyme concentration and adsorption time were found to be significant influence factors, and the maximum activity recovery (50.75%) obtained from response surface methodology was in excellent agreement with experimental value (50.81%). Furthermore, various characteristics of immobilized...
Tipo: Journal article
Palavras-chave: &amp;#946; -glucosidase characters chitosan beads immobilization response surface methodology.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600006

Microbial succession in a fermenting of wild forest noni (Morinda coreia Ham) fruit plus molasses and its role in producing a liquid fertilizer
Provedor de dados: 69
Autores: Kantachote,Duangporn; Kowpong,Kanjana; Charernjiratrakul,Wilawan; Pengnoo,Ashara.
The numbers of lactic acid bacteria (LAB) and yeasts that were present during a wild forest noni (Morinda coreia Ham) fermentation, the changes in its physico-chemical properties and levels of plant nutrients were investigated. LAB increased rapidly during the first 7 days and were the dominant population until after day 21 when the LAB were declining and the yeasts began to dominate. Identification of the LAB and yeasts to species level showed that the dominant LAB throughout was Lactobacillus plantarum while Lactobacillus pentosus was found but only at day 21. Saccharomyces cerevisiae was the most dominant species of yeast throughout but was slowly replaced by Pichia membranifaciens and then Pichia anomala. Rhodotolura mucilaginosa, an aerobic yeast, was...
Tipo: Journal article
Palavras-chave: Lactobacillus plantarum; Morinda coreia Ham; Physicochemical property; Pichia spp.; Plant nutrients; Wild forest noni fermentation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300009

HELMINTOS PARASITOS DE ATELOPUS BOMOLOCHUS PETERS 1973 (ANURA: BUFONIDAE) DE PIURA, PERU
Provedor de dados: 72
Autores: Iannacone,José.
Se realizó una investigación cuantitativa de la fauna parasitaria del anfibio Atelopus bomolochus Peters 1973 (Bufonidae). treintaytres especímenes fueron colectados manualmente de las inmediaciones del río Seco (80° 9'22'' LW, 5° 5'19'' LS), en las cercanías de la localidad de Chulucanas, provincia de Morropón, departamento de Piura, Perú en octubre del 2000. En total se colectaron 7 especies y 13.268 especímenes. Veintyocho hospederos estuvieron parasitados (84,8 %). Trece hospederos (39,4 %) mostraron infección con 1 especie de parásito, seis (18,2 %), ocho (24,2 %) y uno (3,0 %) tuvieron 2, 3 y 4 especies de parásitos, respectivamente. Se encontraron siete especies de parásitos con las siguientes prevalencias de infección: Gorgoderina parvicava...
Tipo: Journal article
Palavras-chave: Acantocephala; Atelopus bomolochus; Anura; Cestoda; Helmintos; Nematoda.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100002

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

RESPUESTAS HEMATOLOGICAS DE TRUCHAS (ONCORHYNCHUS MYKISS WALBAUM 1792) A ESTRES HIPOXICO AGUDO: SERIE ROJA
Provedor de dados: 72
Autores: Valenzuela,Ariel; Alveal,Katherine; Tarifeño,Eduardo.
En peces, para el control homeostático, se necesita un adecuado suministro de oxígeno desde el medio acuático hasta los sitios de metabolismo aeróbico. Muchos peces están bien adaptados para soportar condiciones hipoxicas en su ambiente por ajustes respiratorios y cardiovasculares. Sin embargo no existe suficiente información sobre la respuesta homeostática de parámetros sanguíneos a hipoxia aguda. En los peces de cultivo es común que ellos sean expuestos a cortos periodos de hipoxia o anoxia a causa de fallas en las rutinas de manejo. Se determinó hematocrito, hemoglobina, recuento de eritrocitos, tamaño de los eritrocitos y cantidad de hemoglobina por eritrocito en truchas (Oncorhynchus mikyss) llevadas a hipoxia progresiva por mantención de los peces en...
Tipo: Journal article
Palavras-chave: Hipoxia; Respiración; Bazo; Hematología; Truchas.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200024

ODONTODACTYLUS HAWAIIENSIS MANNING,1967 (STAMATOPODA, GONODACTYLIDAE) EN AGUAS CHILENAS
Provedor de dados: 72
Autores: Retamal,Marco A.
RESUMEN Se identifica y registra, por primera vez, la especie Odontodactylus hawaiiensis Manning, 1967 en aguas oceánicas chilenas, extendiéndose su distribución geográfica desde el Archipiélago Hawaiiano (islas Maui, Molokai y Hawaii) hasta los alrededores de la isla Salas y Gómez
Tipo: Journal article
Palavras-chave: Stomatopod; Gonodactylidae; Oceánico.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100010

INTERANNUAL VARIABILITY OF THE KUROSHIO CURRENT INTRUSION IN THE SOUTH CHINA SEA
Provedor de dados: 72
Autores: Caruso,Michael J; Beardsley,Robert C; Gawarkiewicz,Glen G.
The interannual variability of the Kuroshio Current intrusion into the South China Sea is investigated using a combination of satellite remote sensing data and in situ measurements. This research was conducted as part of the Asian Seas International Acoustic EXperiment (ASIAEX). The circulation of the South China Sea has been studied for years and is predominantly wind-forced by the northeast winter and southwest summer monsoons. There remains some uncertainty to the interannual nature of the circulation and the effect of Kuroshio intrusions on mesoscale features in the northeast South China Sea. Satellite observations of Sea Surface Temperature (SST) from the Tropical Rainfall Measuring Mission (TRMM) and Sea Surface Height Anomalies (SSHA) from...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200017

NUEVOS REGISTROS DE TYLOS CHILENSIS SCHULTZ, 1983 (ISOPODA, ONISCIDEA, TYLIDAE) EN LA COSTA DE CHILE
Provedor de dados: 72
Autores: Pérez-Schultheiss,Jorge.
The isopod crustacean Tylos chilensis is reported from two new localities of the Chilean coast extending its known geographic range further south to the 40º S. In addition, an identification key to Chilean species of Tylos is provided
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200009

Global warming projection of the change in dissolved oxygen concentrations in low oxygen regions of the oceans
Provedor de dados: 72
Autores: Matear,Richard.
Global warming projections using a range of climate models included in the IPCC 4th assessment report (AR4) suggest the oceans will warm, the stratification of the upper ocean will increase and the ventilation of the ocean interior will change. These physical changes will impact dissolved oxygen levels in the ocean. Using a global warming projection from the CSIRO (Australian Commonwealth Scientific and Research Administration) climate model linked to a simple ocean biogeochemical model I investigated how dissolved oxygen levels in the ocean interior change under global warming. The climate simulations project the low oxygen regions like the eastern equatorial Pacific will expand. By the end of the century it is projected that the volume of hypoxic water...
Tipo: Journal article
Palavras-chave: Global warming; Oxygen changes; Anoxia; Biogeochemical cycles; Climate change.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300010

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

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

STUDIES ON THE ECOLOGY OF LARVAL MYCTOPHIDS (PISCES, MYCTOPHIDAE): A PROPOSAL FOR NEW RESEARCH LINES IN THE HUMBOLDT CURRENT
Provedor de dados: 72
Autores: Rodríguez,Laura; Castro,Leonardo.
This is a review on some biological and ecological characteristics of the early life stages of myctophids that exemplify their adaptations to coastal upwelling zones and oceanic nearby areas. The approach has been, however, not to make an exhaustive list of all possible research subjects but, in a more pragmatic way, a) to identify relevant aspects that can be approached with currently available methods in the region and, b) through examples of studies published nationally and regionally, to stimulate future research in larval ecology in the Humboldt Current. Three major themes were assessed: taxonomy and systematics, population ecology and reproductive strategies and, ecophysiology of the early life stages. Among the former, we detected a lack of...
Tipo: Journal article
Palavras-chave: Ichthyoplankton; Myctophids; Humboldt Current; Upwelling areas.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200011

MANTENCION DEL PATRON DE DISTRIBUCION ESPACIAL, DENSIDAD Y ESTRUCTURA DE TAMAÑOS DE LA ALMEJA DE AGUA DULCE Diplodon chilensis GRAY, 1828 (BIVALVIA: HYRIIDAE) EN EL LAGO PANGUIPULLI, CHILE
Provedor de dados: 72
Autores: Lara,Gladys; Parada,Esperanza.
El propósito del presente estudio fue comprobar si han ocurrido cambios, después de 16 años, en los patrones de abundancia, distribución espacial y estructura de talla de la almeja de agua dulce Diplodon chilensis en sustratos arenosos y areno-pedregosos del sector Chauquén del Lago Panguipulli. Los resultados indican que las almejas en 1987 y 2003 presentan una distribución espacial agregada en ambos sustratos y con una mayor fuerza de la agregación en los sustratos areno-pedregosos que arenosos. La densidad fue significativamente mayor en sustrato areno-pedregoso, tanto en 1987 (P &lt; 0,001) como en el 2003 (0,001&lt; P &lt; 0,01). No se presentaron diferencias significativas (P &gt; 0,05) en densidad entre los distintos años dentro de un mismo tipo de...
Tipo: Journal article
Palavras-chave: Almeja de agua dulce; Diplodon chilensis; Distribución; Abundancia; Evaluación ecológica.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100007

Patrones idiosincráticos de diversidad genética de peces nativos del Río San Pedro (Cuenca del Río Valdivia), un sistema de la región glaciada del sur de Chile
Provedor de dados: 72
Autores: Victoriano,Pedro F; Vera,Iván; Olmos,Viviana; Dib,Mariem; Insunza,Bárbara; Muñoz-Ramírez,Carlos; Montoya,Rolando; Jara,Alfonso; Habit,Evelyn.
Estudiamos los niveles y patrones de variabilidad genética de ocho especies de peces nativos de la cuenca del río San Pedro (cuenca del río Valdivia, Región de los Ríos, Chile), con el objetivo de evaluar diferencias microevolutivas en especies sometidas a similares condiciones ecológicas e históricas. Las especies consideradas fueron: Diplomystes camposensis, Percilia gillissi, Galaxias platei, G. maculatus, Basilichthys australis, Percichthys trucha, Aplochiton taeniatus y A. zebra. Para ello comparamos indicadores de diversidad genética tanto intra como inter-zonas, e indicadores de estructuración, basados en secuencias de la región de control, para diferentes tramos a lo largo del desarrollo del río. También recuperamos relaciones de parentesco entre...
Tipo: Journal article
Palavras-chave: Peces nativos; Variabilidad genética; Conservación genética; Chile; Glaciaciones.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100007

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

NEOTROPICAL ZEUGMATOTHRIPS (THYSANOPTERA: PHLAEOTHRIPIDAE)
Provedor de dados: 72
Autores: Retana-Salazar,Axel P.; Soto-Rodríguez,Gerardo A.
Se presenta el análisis filogenético para 18 especies conocidas de Zeugmatothrips, usando el método del grupo externo. Cuando se incluyó al género Cyphothrips en el grupo interno, se obtuvieron novedosos resultados de un posible grupo no monofilético y nueve árboles con un c.i.= 0.594, h.i.=0.493, longitud=69 y un g=0.46 (p&gt;0.01). El árbol de consenso estricto tiene un c.i. (Rohlf) =0.938. Las politomías se resolvieron utilizando el análisis de Dmáx (equiprobabilidad). Se repitió el análisis usando un ancestro hipotético, la longitud se incrementó pero el c.i. para el consenso fue similar
Tipo: Journal article
Palavras-chave: Zeugmatothrips; Cyphothrips; Análisis filogenético; Método grupo afuera; Equiprobabilidad; Ancestro hipotético.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200003

Seasonal changes in oocyte development, growth and population size distribution of Percilia gillissiand Trichomycterus areolatus in the Itata basin, Chile
Provedor de dados: 72
Autores: Chiang,Gustavo; Munkittrick,Kelly R; McMaster,Mark E; Tucca,Felipe; Saavedra,M. Fernanda; Ancalaf,Andrea; Gavilán,Juan F; Unzueta,Luis; Barra,Ricardo.
There is scarce basic biological data on native freshwater fish species from Chile and next to zero on growth, gonad development and reproduction, which are critical for the purposes of the conservation of their natural populations. Seasonal analysis of sub-individual (oocyte development) and population (length frequency, growth rates) endpoints in Trichomycterus areolatus and Percilia gillissi were evaluated from February 2007 to January 2008. Oocyte development has a marked seasonality for P. gillissi, with mature eggs in October and declining frequency of mature oocytes into January. For T. areolatus we found some mature eggs in July, with highest number of mature eggs in October, coincident with previous data on maximum gonad size. Both species showed...
Tipo: Journal article
Palavras-chave: Seasonal cycles; Native fish Chile; Oocyte development; Multiple spawning reproductive strategy; Population size-structure.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300006

FIRST RECORD OF XYLOCOPA (SCHONNHERRIA) SPLENDIDULA LEPELETIER 1841 (HYMENOPTERA: APIDAE: XYLOCOPINI) IN THE MEDITERRANEAN ZONE OF CHILE
Provedor de dados: 72
Autores: Montalva,José; Dudley,Leah S; Arroyo,Mary T.K.
Se reporta la presencia de Xylocopa splendidula para Santiago, Chile. En Marzo de 2007, hembras fueron observadas nidificando en Acacia dealbata Link y entre diciembre 2007 y febrero 2008 fueron observadas forrajeando sobre Parkinsonia apiculataL. Este es el primer registro de la especie para la zona mediterránea de Chile.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200012

Liolaemus lonquimayensis (Squamata: Liolaemidae), a new lizard species for Chile without precloacal pores
Provedor de dados: 72
Autores: ESCOBAR HUERTA,GUSTAVO; SANTIBÁÑEZ TORO,JESSICA; ORTIZ,JUAN CARLOS.
This study describes a new species of lizard of the genus Liolaemus (L. lonquimayensis), without precloacal pores, associated with the lava flows of the Lonquimay volcano in the Región de la Araucanía, Chile. This species belongs to the elongatus clade, and is a sister lineage of L. elongatus. L. lonquimayensis differs from its sister species, L. elongatus, in the total absence of precloacal pores, smaller maximum SVL (69.7 mm in L. lonquimayensis and 91.0 mm in L. elongatus), greater number of midline scales (88 in L. lonquimayensis and 77 in L. elongatus), body color light grey to black in L. lonquimayensis and light to dark brown in L. elongates. L. lonquimayensis has an black occipital band formed by small black lines arranged horizontally flanked by...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100009

Usefulness of heterologous microsatellites obtained from Genypterus blacodes (Schneider 1801) in species Genypterus off the Southeast Pacifc
Provedor de dados: 72
Autores: Canales-Aguirre,Cristian B; Ferrada,Sandra; Hernández,Cristian E; Galleguillos,Ricardo.
Analizamos la utilidad de cinco loci de microsatélites aislados en Genypterus blacodes de Australia en especies de Genypterus presentes en Chile (G. chilensis, G. maculatus y G. blacodes). Los resultados muestran que los loci microsatélites amplifcan positivamente en cada especie y podrían ser utilizados en futuros estudios poblacionales.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100011

Estado de conocimiento de los Ephemeroptera de Chile
Provedor de dados: 72
Autores: Camousseight,Ariel.
De acuerdo al conocimiento actual del Orden Ephemeroptera en Chile, se tiene un total de 57 especies, distribuidas en 25 géneros y 7 familias, con un 40% de ellas descritas a nivel de adultos y ninfas, 12% sólo por las ninfas y 47% sólo por los adultos machos y/o hembras. Con respecto a su distribución, el 56% de las especies serían exclusivas del territorio nacional, 33% se comparten con Argentina y 11% tienen una distribución más amplia.
Tipo: Journal article
Palavras-chave: Insecta; Ephemeroptera; Taxonomía; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100009

USE OF SATELLITE WAVE DATA IN THE WORLDWAVES PROJECT
Provedor de dados: 72
Autores: Barstow,Steve; Mørk,Gunnar; Lønseth,Lasse; Schjølberg,Peter.
The demand for reliable information on wave conditions, in particular at coastal sites, is increasing. WorldWaves is a newly completed software package, developed by Fugro OCEANOR with funding from industry and within the framework of various European Commission sponsored contracts, notably EnviWave. The system simplifies the modelling of wave conditions in coastal waters, resulting in more timely, lower cost but reliable data. Thus, WorldWaves should be particularly beneficial in developing countries. In WorldWaves, the following are integrated under a single Matlab toolbox: · High quality long-term wave data offshore all global coasts. · Global bathymetric and coastline data. · Two shallow water wave models: SWAN, a third generation wave model and a...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200007

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

Natural Geography in Nearshore areas (NaGISA): The Nearshore component of the Census of Marine Life
Provedor de dados: 72
Autores: Iken,Katrin; Konar,Brenda.
The Natural Geography in Shore Areas (NaGISA, the Japanese word for beach) project is the nearshore component of the Census of Marine Life program. NaGISA targets nearshore marine biodiversity in large macrophyte communities (hard bottom macroalgal communities and soft sediment sea grass beds) in a depth zonation from high intertidal to 15 m water depth. The overall goal of NaGISA is to quantify nearshore biodiversity on a global scale by conducting a longitudinal and latitudinal gradient. Outreach to the public, involvement of local communities in the sampling, and education are important components of the NaGISA program.
Tipo: Journal article
Palavras-chave: Biodiversity of beaches; Hard bottoms; Macroalgae; Sea grasses.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200004

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

Taxonomía y antecedentes biológicos de Microdulia mirabilis (Rothschild 1895) (Lepidoptera: Saturniidae)
Provedor de dados: 72
Autores: Parra,Luis E; Ibarra-Vidal,Héctor.
Se describe el huevo, larva, pupa e imago de Microdulia mirabilis (Rotschild), insecto nativo defoliador de Nothofagus obliqua Mirb. (Oerst). M. mirabilis se distribuye entre los 35° y 47° S en Chile y en Neuquén, Argentina. Se entregan aspectos del ciclo de vida relacionados con períodos de duración de sus diferentes estados de desarrollo. Se ilustran los distintos estados inmaduros, los imagos y las estructuras de las armaduras genitales.
Tipo: Journal article
Palavras-chave: Cercophaninae; Estados inmaduros; Morfología; Distribución; Nothofagus obliqua; Chile.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100004

The eye-bulging in Liolaemus lizards (Weigmann 1843)
Provedor de dados: 72
Autores: REYES-OLIVARES,CLAUDIO; RAIN-GARRIDO,INGER; LABRA,ANTONIETA.
It is described for the first time the eye-bulging display in two liolaemid lizards, Liolaemus chiliensis and L. gravenhorstii. This display occurs in very low frequency and it was observed in captivity. It is discussed the possibility that the thermoregulation and/or eye-cleaning hypotheses may explain the occurrence of this display in these two species.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100013

INFLUENCE IF ATMOSPHERIC MOISTURE TRANSPORT ON ICE COVERAGE IN POLAR REGIONS
Provedor de dados: 72
Autores: Tang,Wenqing; Liu,W. Timothy.
Change in Earth's polar ice sheets is potentially a major source of sea level variability, dramatically affecting global water cycle. One important component in the polar region water balance is the atmospheric moisture transported from lower latitude, which is traditionally estimated from rawinsonde measurements. A method has been developed to estimate moisture transport integrated over the depth of the atmosphere (IMT) by combining the observations by spacebased scatterometers and microwave radiometers. The gridded IMT fields over global oceans have been produced for the period from August 1999 to December 2003, using data from QuikSCAT and the Special Sensor Microwave / Imager (SSM/I). The temporal and geographical variation of IMT into Greenland and...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300045

Estado de conocimiento de los Bivalvos dulceacuícolas de Chile
Provedor de dados: 72
Autores: Parada,Esperanza; Peredo,Santiago.
Se presenta el estado actual del conocimiento de los bivalvos dulceacuícolas chilenos. Las especies descritas a la fecha, pertenecen a las familias Hyriidae, representada sólo por el género Diplodon con dos especies (D. chilensis y D. solidulus) y Sphaeriidae con tres géneros: Pisidium con siete especies (P. chilense, P. magellanicum, P. lebruni, P. observationis, P. meierbrooki, P. huillichum y P. llanquihuense), Sphaerium con dos especies (S. lauricochae y S. forbesi) y Musculium con dos especies (M. argentinum y M. patagonicum). Entidades subgenéricas y subespecíficas son reconocidas sólo para Hyriidae. Se propone a Pisidium chilense, P. huillichum, P. llanquihuense, P. lebruni y D. solidulus como especies endémicas de Chile. Se señala la distribución...
Tipo: Journal article
Palavras-chave: Hyriidae; Sphaeriidae; Biodiversidad; Especies endémicas; Distribución geográfica; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100013

FISHERY AND OCEANOGRAPHIC MONITORING SYSTEM (FOMS): A NEW TECHNOLOGICAL TOOL BASED ON REMOTE SENSING, WITH APPLICATION IN ECOSYSTEM MANAGEMENT OF COASTAL FISHERIES IN PATAGONIA
Provedor de dados: 72
Autores: González,Raúl; Gaspar,Claudio; Curtolo,Luis; Sangiuliano,Italo; Osovnikar,Paul; Borsetta,Néstor.
The Fishery and Oceanographic Monitoring System (FOMS) or Sistema de Monitoreo Pesquero y Oceanográfico (SiMPO) in Spanish, was recently established in San Matías Gulf (Argentina) with the objective of monitoring fishing fleet operations. FOMS was also conceived as a fundamental tool for supporting research activities in the context of the Ecosystem Approach to Fisheries. A detailed description of the system is offered. An on line satellite transceiver (Inmarsat D+) supplies data about position, bearing and speed of the vessels, and alarms are automatically triggered whenever vessels are detected fishing in forbidden areas. The off line module integrating one on board CPU with other components: an electronic logbook allowing to the skipper load data on...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200042

ESTUDIO DE LA CONTAMINACION FECAL MENSUAL Y ESTACIONAL EN LA ZONA COSTERA ADYACENTE AL EMISARIO SUBMARINO EN LA BAHIA DE PUERTO MONTT
Provedor de dados: 72
Autores: Toledo,Héctor; Hernández,Claudia; Rodríguez,Cristina; Bittner,Verónica; Ferreira,Luis; Orellana,Francisco.
La zona costera del mar interior de la Décima Región, incluyendo principalmente el Seno de Reloncaví, es un área que desde que se instalaron los primeros habitantes en sus alrededores ha sido impactada por aguas residuales domésticas e industriales, así como también por la actividad agrícola, forestal y acuícola en los últimos 10 años. La zona costera de la bahía de Puerto Montt ha sido poco estudiada, sobre todo cuando se intenta evaluar el estado actual de las condiciones ambientales y más aún cuando se pretende conocer los posibles impactos que se estén generando con posterioridad a la instalación del emisario submarino de aguas servidas. El presente estudio pretende obtener un diagnóstico del estado de contaminación bacteriológica de la bahía de Puerto...
Tipo: Journal article
Palavras-chave: Coliformes fecales; Emisario submarino; Contaminación.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100011

HORIZONTAL DISTRIBUTION CHARACTERISTICS OF THE RESUSPENDED SOLID IN THE EAST CHINA SEA USING SATELLITE REMOTE SENSING
Provedor de dados: 72
Autores: Young-Sang,Suh; Kyung Lee,Na; Seup Kim,Yeong; Ishizaka,Joji.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300043

WEAKENING OF HORIZONTAL SEA SURFACE TEMPERATURE GRADIENTS AT LOW WIND SPEEDS WITH STRONG INSOLATION
Provedor de dados: 72
Autores: Katsaros,Kristina B.
During days with strong insolation and low wind speed, there may be uneven net heating of the water layer near the surface of the ocean caused by variations in horizontal temperature at the sea surface. The heat loss from the water caused by evaporation, sensible, or longwave radiation is proportional to the sea surface temperature and is, therefore, greater from warm water compared to that from the relatively colder water. As a result, under low wind speed conditions and clear skies, the horizontal SST discontinuities, occurring at fronts, eddies, or in storm wakes, may diminish or even vanish. This phenomenon is illustrated here with some field and modeling results. The time dependence is important for the impact on remote sensing of SST, and it is found...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200055

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

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

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

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

Foreword
Provedor de dados: 72
Autores: Gallardo,Víctor Ariel.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200001

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

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

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

Estudio comparativo de la morfología de huevos en Tettigoniinae (Insecta: Orthoptera) de Chile, mediante una aproximación con SEM
Provedor de dados: 72
Autores: VERA SÁNCHEZ,ALEJANDRO.
La morfología coriónica de huevos, para cuatro géneros de la tribu Nedubini presentes en Chile, se estudia de forma comparada, tres de estos géneros son endémicos. Se describen los huevos para las especies Barraza cribeloplatus, Xyrdectes fuscens, Falsidectes divisus, Platydecticus onax, P. pheroxyfus, P. robertsi y P. sp. Las observaciones fueron realizadas con microscopía óptica y SEM. Los huevos de Nedubini para la Región Andina de América del Sur son descritos por primera vez, los resultados muestran que la morfología de las celdas coriónicas y de las micropilas son informativas para diagnosticar géneros y especies.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200009

Exordio a &amp;#34;Una Celebración de los Aniversarios Darwinianos de 2009&amp;#34;
Provedor de dados: 72
Autores: D’Elía,Guillermo.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000300001

Establecimiento y Propagación del Darwinismo en Chile: Recepción y Elaboración de las Ideas
Provedor de dados: 72
Autores: Medel,Rodrigo; Veloso,Alberto.
En este trabajo presentamos un análisis del escenario social y cultural de la época en que ocurre el viaje de Darwin a Chile. Sobre esa base, describimos el impacto a corto y mediano plazo del viaje del naturalista en el ambiente cultural de la época en el país, sugiriendo algunos elementos que pudieron haber infuido en el establecimiento y propagación de las ideas Darwinianas en el Chile de fnes del siglo XIX y primera mitad del siglo XX. Identifcamos tres etapas en el proceso. Primero, una etapa naturalista, relacionada con el aporte directo de Darwin al conocimiento de la diversidad biológica de Chile descrita hasta aquel momento. Segundo, una etapa ideológica, caracterizada por debates no científcos de su obra, los cuales fueron efectuados por...
Tipo: Journal article
Palavras-chave: Beagle; Darwin; Historia natural; Selección natural.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000300002

Evaluación de dos métodos de análisis dietarios aplicados en la Bandurria Theristicus melanopis (Gmelin 1789) y el Queltehue Vanellus chilensis (Molina 1782)
Provedor de dados: 72
Autores: GANTZ,ALBERTO; RAU,JAIME R.; SADE,SORAYA; YAÑEZ,MIGUEL.
Los estudios dietarios contribuyen a comprender la ecología de las aves y son relevantes en programas de conservación de los organismos. Contrastamos los métodos de análisis dietarios fecales y estomacales en la Bandurria y en el Queltehue, para evaluar su sensibilidad para discriminar las presas consumidas. La diversidad y la abundancia de presas detectadas fueron mayores en los estómagos que en las heces en ambas especies de aves. El Queltehue no mostró una asociación en el número de categorías tróficas, ni una similitud en la composición taxonómica de la dieta entre ambos métodos, lo que sugiere que los análisis fecales no son confiables y pueden conducir a interpretaciones erróneas de la ecología trófica de esta especie de ave. La Bandurria mostró una...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100007

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

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

UNA NUEVA ESPECIE DE SCANIA OLIVARES (LEPIDOPTERA, NOCTUIDAE, AUSTRANDESIINI)
Provedor de dados: 72
Autores: Olivares,Tania S.; Angulo,Andrés O.
This work presents a new species closed to S. strigigrapha (Hampson), S. trimaculata sp.nov., from the high Andean region (Las Trancas, VIII Region, Chile). The adult male and its genitalia are described and illustrated
Tipo: Journal article
Palavras-chave: Taxonomy; S. trimaculata n. sp.; S. strigigrapha Hampson; High Andean region; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100001

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

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

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

USING UPDATED PARABOLIC EQUATIONS CODES TO EXAMINE ACOUSTIC TRANSMISSION LOSSES MEASUREMENTS OVER THE ARGENTINEAN CONTINENTAL SLOPE
Provedor de dados: 72
Autores: de Milou,Marta. E.; Salvadores,Silvia R.; Blanc,Silvia.
Up and down slope acoustic propagation measurements were conducted in 1989 [Milou et al., 1990] over the Argentinean continental slope leading to experimental values of Transmission Losses (TL) for the 100 - 400 Hz frequency band. This enabled comparisons between the obtained data and the parabolic equation (PE) model predictions. With the aim of examining the effects of using updated PE codes [Collins, 1993] including their corresponding physical and computational improvements, on the already obtained results, predicted TL values are recomputed. An analysis of these new comparisons are presented here
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300013

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

PREVALENCIA E INTENSIDAD DE ECTOPARASITOS ASOCIADOS A TADARIDA BRASILIENSIS (GEOFFROY SAINT-HILAIRE, 1824) (CHIROPTERA: MOLOSSIDAE) EN CONCEPCION
Provedor de dados: 72
Autores: Muñoz,Lisandro; Aguilera,Milenko; Casanueva,María E.
En este trabajo se presenta el estudio de la prevalencia e intensidad de artrópodos ectoparásitos recolectados en 90 ejemplares de Tadarida brasiliensis (Geoffroy Saint-Hilaire, 1824) capturados en la ciudad de Concepción, VIII Región-Chile (36°40'S; 73°04'O), desde noviembre del 2000 a marzo del 2001. Los ectoparásitos recolectados fueron una especie de pulga, Sternopsylla distincta (Rothschild, 1903), y tres especies de ácaros, Chiroptonyssus robustipes (Ewing, 1925), Ewingana inaequalis (Ewing, 1938) y Notoedres lasionycteris (Boyd &amp;amp; Bernstein, 1950). El 100% de los murciélagos se encontraron parasitados y se les extrajo un total de 3.185 ectoparásitos. C. robustipes fue la especie más común con un 100% de prevalencia, seguida de N....
Tipo: Journal article
Palavras-chave: Chiroptera; Tadarida brasiliensis; Ectoparásito; Ácaros; Pulgas; Chiroptonyssus robustipes.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100001

Zooplankton interactions with the oxygen minimum zone in the eastern south pacific
Provedor de dados: 72
Autores: Escribano,Rubén.
Zooplankton in the coastal upwelling zone off the eastern South Pacific must cope with a shallow oxygen minimum zone. In this work, I summarize available information on the zooplankton species that interact with the OMZ in the upwelling region off northern Chile. Data are available from the MinOx cruise carried out in March 2000 and the ZOMEI cruise perfomed in October 2005, both onboard the R/V Vidal Gormaz of the Chilean navy. Nineteen species of copepods and 10 of euphausiids were analyzed in their vertical distribution and migrating behavior. Several abundante species appeared constrained by the OMZ and restricted to the upper 50m layer. However, other abundant species inhabit temporarily or permanently the OMZ contributing substantially to the...
Tipo: Journal article
Palavras-chave: Carbon flux; Copepods; Euphausiids; Vertical migration; Zooplankton.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300005

PICO-PHYTOPLANKTON DISTRIBUTION IN WESTERN PACIFIC OCEAN ESTIMATED FROM OCEAN COLOR AND SST
Provedor de dados: 72
Autores: Senga,Yasuhiro; Horiuchi,Tomohiro.
To investigate the spatial distribution of pico-phytoplankton in surface water, photosynthetic pigments were analyzed by a high-performance liquid chromatography (HPLC) for three cruises in the western Pacific Ocean carried out on 2000, 2001 and 2002. Analyzed chlorophyll-a showed peaks at the equatorial region and near Japan. In contrast, zeaxanthin, a specific pigment of pico-phytoplankton such as Synechococcus and Prochlorococcus showed a broad peak around equatorial region. From these results, we found inverse relationship between the ratio of zeaxanthin to chlorophyll-a concentration (ZCR) and chlorophyll-a concentration, and also positive relationship between ZCR and sea surface temperature (SST). And we derived a multiple regression equation to...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300037

THE IMPORTANCE OF THE GEODETIC OBSERVATORY TIGO FOR GEOREFERENTIATION
Provedor de dados: 72
Autores: Hase,Hayo.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200049

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

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

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

VARIABILIDAD DE INDICES BIOLOGICOS EN PINGUIPES CHILENSIS VALENCIENNES 1833 (PERCIFORMES, PINGUIPEDIDAE): ¿ESTAN REALMENTE CORRELACIONADOS?
Provedor de dados: 72
Autores: González,Paola; Oyarzún,Ciro.
Se ha señalado que el Indice Gonadosomático (IGS) se relacionaría en forma inversa al Factor de Condición (FCC) y al Indice Hepatosomático (IHS) debido a una demanda de energía por parte del pez para procesos reproductivos. El presente trabajo estudia el comportamiento de estos índices durante un ciclo anual de reproducción en la especie Pinguipes chilensis (rollizo). En hembras (n=200) y machos (n=214) de P. chilensis capturados en el litoral de Talcahuano, se analizó el comportamiento de las curvas del IGS, FCC e IHS en forma estacional. Además se estudio la relación existente entre el IGS, el FCC y el IHS mediante modelos de regresión lineal simple. Se encontraron diferencias significativas para cada una de las curvas en forma estacional. Los valores...
Tipo: Journal article
Palavras-chave: Pinguipes chilensis; Reproducción; Indice Gonadosomático; Factor de Condición; Indice Hepatosomático; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200023

Effects of cadmium on total phenolic compounds and flavonoids in Euglena gracilis
Provedor de dados: 72
Autores: CERVANTES-GARCIA,DAVID; TRONCOSO-ROJAS,ROSALBA; SÁNCHEZ-ESTRADA,ALBERTO; GONZÁLEZ-MENDOZA,DANIEL; GUTIERREZ-MICELI,FEDERICO; CECEÑA-DURAN,CARLOS; GRIMALDO-JUAREZ,ONECIMO.
In the present study the production of phenolic acids and flavonoid compounds by E. gracilis exposed to two cadmium concentrations (0.02 and 0.14 mM) was evaluated using high-performance liquid chromatography (HPLC). The results showed that E. gracilis exposed to 0.02 mM Cd+2 increased significantly the total content of phenolic compounds (798.46 ± 12.61 &amp;#956;g GA/g) and total flavonoids (241.34 ± 47.63 &amp;#956;g QE/g) with respect to the control (137.34 ± 19.80 &amp;#956;g QE/g DW and 549.00 ± 8.57 &amp;#956;g GA/g DW, respectively). However, no significant increase in the total content of phenolic compounds (568.54 ± 17.42 &amp;#956;g GA/g DW) and total flavonoids (141.11 ± 9.36 &amp;#956;g QE/g DW) were observed in E. gracilis exposed to 0.14 mM...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100001

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

First record of Vanessa braziliensis (Moore) (Lepidoptera: Nymphalidae) in Chile
Provedor de dados: 72
Autores: Vargas,Héctor A.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200009

SYNOPTIC MAPPING OF SHALLOW, MARINE, COASTAL COMMUNITIES USING AIRBORNE HYPERSPECTRAL SENSORS: TECHNICAL ASPECTS, OPERATIONAL APPROACHES, AND PROVEN APPLICATIONS
Provedor de dados: 72
Autores: Gagnon,Patrick; Ripley,Herbert T; Jones,William.
The integrity of littoral ecosystems is seriously threatened by the sustained and evergrowing exploitation of coastal resources by humankind, the introduction of non indigenous species, and the ongoing climate change. The concurrent exploitation and preservation of coastal ecosystems is a major challenge, which can only be effectively addressed using synoptic tools and approaches for detailed mapping and monitoring of subtidal communities. One of the most promising technologies to this end is the use of airborne hyperspectral remote sensing technologies that feature both high spectral and spatial resolutions. This paper provides an overview of the technical aspects and operational approaches to map the extent of shallow, marine, coastal habitats over large...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200037

RELATING SPATIAL DISTRIBUTION OF CHILEAN JACK MACKEREL EGGS AND ENVIRONMENTAL FACTORS IN THE OCEANIC WATERS OFF CHILE
Provedor de dados: 72
Autores: Núñez E.,Sergio; Letelier P.,Jaime; Donoso Q.,David; Sepúlveda O.,Aquiles; Arcos R.,Dagoberto.
Chilean jack mackerel (Trachurus murphyi) is a highly migratory pelagic species that inhabits the Southern Pacific Ocean, constituting the most important fishery for Chile. This species exhibits an onshore migration during the summer related to coastal food availability, and an offshore migration towards reproductive oceanic areas (beyond Chilean EEZ) in early spring. During the spawning peaks (November) of 1998, 1999, 2000 and 2001, jack mackerel eggs were collected from four systematic surveys using 8-10 fishing vessels, deployed in the spawning area (76-92 W) off central Chile. Spatial distribution of eggs was modeled by geostatistical techniques. Environmental information including SST, wind, sea level anomalies and chlorophyll-a, as well as SST...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300023

HUENIA PACIFICA MIERS, 1879, PRIMER REGISTRO DEL GENERO Y DE LA ESPECIE PARA EL PACIFICO SUDORIENTAL
Provedor de dados: 72
Autores: Retamal R,Marco A.
Se identifica el género Huenia con la especie Huenia pacifica Miers, 1879 siendo este el primer reporte del género en aguas americanas. Tres especímenes fueron recolectados en aguas alrededor de Salas y Gómez, una isla oceánica chilena (25º 27'Lat. S; 105º 21' Long. W.) durante el crucero CIMARISLAS 5
Tipo: Journal article
Palavras-chave: Decapoda; Bentónico; Oceánico; Chileno; Isla Salas y Gómez.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200012

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

EN EL TERCER CENTENARIO DEL NACIMIENTO DE CARLOS LINEO: LINEO Y MOLINA DEVELADORES DE LA BIODIVERSIDAD CHILENA
Provedor de dados: 72
Autores: Moyano,Hugo I.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200002

Primer reporte de la colección de moluscos presentes en el Museo Maggiorino Borgatello (Punta Arenas, Chile)
Provedor de dados: 72
Autores: ROSENFELD,SEBASTIÁN; MARAMBIO,JOHANNA; ALDEA,CRISTIAN.
La colección de moluscos chilenos del Museo Salesiano Maggiorino Borgatello (Punta Arenas, Chile) fue creada alrededor del año 1905 con el objetivo de rescatar el conocimiento local de la malacofauna. Desde esa fecha hasta mediados del siglo XX se habían ingresado numerosos especimenes, los cuales fueron identificados por curadores locales, pero que nunca fueron sometidos a un inventario exhaustivo ni identificación taxonómica. Este trabajo entrega información sobre las especies de moluscos que actualmente están presentes en el museo. Se registraron un total 37 especies de moluscos (26 gasterópodos y 11 bivalvos), de las cuales 19 corresponden a especies de interés comercial. Desde el punto de vista biogeográfico, la colección representa alrededor del 4%...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100009

Nicho trófico de Orestias agassii (Cuvier &amp;amp; Valenciennes, 1846) del sistema de arroyos del salar de Huasco (20°05'S; 68°15'W)
Provedor de dados: 72
Autores: Riveros,José; Vila,Irma; Méndez,Marco A.
La carencia de información biológica y ecológica de la ictiofauna nacional es uno de los principales vacíos de conocimiento acerca de estos organismos. Esta falta es más notoria en sistemas hídricos aislados del Altiplano sur de Chile, donde el detrimento a causa del balance hidrológico negativo y la demanda de agua por actividad minera han acelerado procesos de eutrofización y salinización. Es por este motivo que se genera la necesidad de obtener información detallada de su ictiofauna. En este trabajo, se estudió los aspectos tróficos de O. agassii procedentes de una vertiente del conjunto de arroyos del Salar de Huasco. Se analizó la trofía de 51 individuos en dos períodos climáticos a través del cálculo del índice de importancia numérica (IIN), el...
Tipo: Journal article
Palavras-chave: Altiplano; Estacionalidad; Orestias; Trofía.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300001

SEM study of Sandersiella chilenica sp.nov. (Cephalocarida), with a review of the Integumentary Structures and Functional Adaptations in the Group
Provedor de dados: 72
Autores: Stuardo,José R; Vega,René.
The Cephalocarid, Sandersiella chilenica sp. nov. from Coliumo Bay, Central Chile ( 36º 32' S lat.; 72º56' W long) is described. The new species was collected at only one bottom station (station 4) in a grid of 11 stations sampled monthly during 1982-83, with predominating fractions of fine sand, silt and clay. Four other species of the genus are so far known (Sandersiella acuminata Shiino 1965, and S.kikuchii Shimomura &amp;amp; Akiyama, 2008, from Japan, S. calmani Hessler &amp;amp; Sanders 1973 from off Perú, and S. bathyalis Hessler &amp;amp; Sanders 1973, from Walvis Ridge, and off Namibia, SE Atlantic, and off Santos, Brazil). S. chilenica sp. nov, is differentiated from each of these by its comparatively greater maximal length, its shorter and...
Tipo: Journal article
Palavras-chave: Crustacea; Cephalocarida; Central Chile; SEM; Cuticular body structures.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000100007

FRONTS AND FRONTAL WAVES OVER THE SOUTHERN CONE
Provedor de dados: 72
Autores: Patoux,Jérôme; Brown,Robert A.
Numerous cold fronts associated with mature extratropical storms sweep the coast of Chile every year. The large expanses of the Southern Pacific Ocean offer an ideal setting for up to 4000-km long cold fronts to develop as their parent cyclones travel from Australia to South America. These fronts sometimes break and spawn secondary cyclones that deepen significantly in one or two days. Examples of such frontal waves will be shown and discussed. An attribution technique applied to scatterometer wind measurements is used to diagnose the development of those frontal waves. Necessary conditions for their development are revealed
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300028

Primer Taller Sudamericano de Biodiversidad Marina para el Censo de la Vida Marina: Discurso de Inauguración
Provedor de dados: 72
Autores: Ausubel,Jesse H.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200002

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

EL ANALISIS RETROSPECTIVO DEL CRECIMIENTO EN PECES Y SUS PROBLEMAS ASOCIADOS
Provedor de dados: 72
Autores: Araya,Miguel; Cubillos,Luis.
La historia del crecimiento individual de los peces se encuentra registrada en las marcas presentes en las estructuras duras como otolitos, escamas, vértebras, huesos y radios. El análisis retrospectivo o retrocálculo es una técnica que permite utilizar esa información para estimar dimensiones corporales en edades o etapas previas de la historia de vida, a través de relaciones entre mediciones realizadas en la estructura dura y las dimensiones del pez. En este trabajo se revisan los métodos de retrocálculo más ampliamente utilizados en peces y sus supuestos, con énfasis en la relación tamaño de la estructura dura - longitud del pez. La estructura dura más utilizada corresponde a los otolitos sagittae de los peces teleósteos, y aunque se hace referencia a...
Tipo: Journal article
Palavras-chave: Retrocálculo; Crecimiento en peces; Otolito; Tasa de crecimiento; Edad.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200010

New records of Moluchia strigata (Blanchard, 1851) (Blattodea: Ectobiidae) in Mediterranean Matorral, Central Chile
Provedor de dados: 72
Autores: VILLAGRA,CRISTIAN A.; SCHAPHEER,CONSTANZA.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100015

The biogeochemistry of the suboxic and anoxic zones in the cariaco basin
Provedor de dados: 72
Autores: Scranton,Mary I; Astor,Yrene; Percy,Dane; Xiaona,Li; Xueju,Lin; Taylor,Gordon T.
A decade-long study of the Cariaco Basin has demonstrated that the suboxic interface in this system is temporally and spatially variable and that it is the home for a diverse and active microbial community. The thickness and structure of the suboxic zone appears to be primarily controlled by the physics of the basin, with oxygen containing intrusions occurring from both eastern and western sills. The microbial populations, which include both heterotrophic and chemoautotrophic micro-organisms, are actively growing at rates which cannot be supported by vertical transport of oxidants or reductants. Our studies suggest that the microbial loop depends on cycling of intermediate oxidation state sulfur species (sulfite, thiosulfate and elemental S) possibly...
Tipo: Journal article
Palavras-chave: Chemoautotrophy; Sulfur; Temporal variability; Microbial loop.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300017

Variaciones espaciales y temporales de las comunidades ribereñas de peces en un sistema fluvial no intervenido: Río San Pedro, Cuenca del Río Valdivia (Chile)
Provedor de dados: 72
Autores: Colin,Nicole; Piedra,Priscila; Habit,Evelyn.
El conocimiento de la dinámica natural de las comunidades biológicas en sistemas fluviales es relevante para la conservación de estos complejos ecosistemas. El río San Pedro, ubicado en la zona sur de Chile (39°46' - 39°51' S), es un sistema que posee una alta naturalidad dado el bajo nivel de perturbaciones antrópicas significativas. En una condición natural como ésta, el régimen de caudal determina en gran medida la dinámica de sus hábitats en el sentido longitudinal, lateral y temporal del río, influyendo a su vez en la distribución de las especies. De esta forma, la diferenciación hidrogeomorfológica a lo largo del río así como la variación a través del año, genera ensambles altamente dinámicos, tanto a nivel espacial como temporal. Con el fin de...
Tipo: Journal article
Palavras-chave: Ecosistema dulceacuícola; Estructura de comunidades; Macrohábitats; Peces; Zona ribereña.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100003

TWO LARVAL CHARACTERS TO SEPARATE COPITARSIA INCOMMODA (WALKER) FROM C. DECOLORA (GUENÉE ) (LEPIDOPTERA: NOCTUIDAE)
Provedor de dados: 72
Autores: Angulo,Andrés O; Olivares,Tania S.
Diagnostic larval features of Copitarsia Hampson, C. decolora (Guenée) and C. incommoda (Walker) involving spinneret and pinnaculae are given. Both species are importance quarantine pest for chilean exporters
Tipo: Journal article
Palavras-chave: Copitarsia; Cucullinae; Larvae; Taxonomy.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200017

LARVAL MORPHOLOGICAL VARIATION AND ITS RELATION TO HOST PLANTS IN SYNCIRSODES PRIMATA (LEPIDOPTERA: GEOMETRIDAE)
Provedor de dados: 72
Autores: Bocaz,Patricia; Parra,Luis E.; Victoriano,Pedro F.
Morphological variations in larvae of Syncirsodes primata (Walker 1862) from different hosts were studied. Three different morphs, varying in the number of dorsal tubercles and color, were detected. It appears that these variations depend upon the species of host plant on which the larvae inhabit. The results suggest that the selection of host plants may determine the color, indicating phenotypic plasticity. However, constancy in tubercle number, independent of a change of host plant, suggests genetic differences among morphs
Tipo: Journal article
Palavras-chave: Morphological variation; Phenotypic plasticity; Syncirsodes primata; Geometridae; Lepidoptera.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100006

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

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

Nitrogen cycling in sub-oxic water colmns
Provedor de dados: 72
Autores: Dalsgaard,Tage; Thamdrup,Bo; Mark Jensen,Marlene.
The current knowledge about nitrogen removal processes in suboxic water columns will be reviewed. The most recent development in the understanding of these processes is the documentation of anaerobic ammonium oxidation with nitrite (anammox) in these areas, and the balance between the traditional denitrification and anammox will be in focus.
Tipo: Journal article
Palavras-chave: Denitrification; Anammox; Water column; Nitrogen removal.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300004

Variabilidad genética local del bivalvo dulceacuícola Diplodon chilensis (Gray 1828) proveniente de tres lagos Nahuelbutanos
Provedor de dados: 72
Autores: Fuentealba,Carmen; Figueroa,Ricardo; González,Fidelina; Palma,Mario.
Se describe la variabilidad genética del bivalvo dulceacuícola Diplodon chilensis proveniente de tres lagos Nahuelbutanos, cada uno de los cuales presenta barreras geográficas y diferencias ambientales reconocibles como consecuencia de diversos eventos geomorfológicos y antrópicos. Nuestros resultados revelaron que sólo Lago Lleu-Lleu se encuentra de equilibrio Hardy- Weinberg (P&lt; 0.05). El desequilibrio gamético se manifestó en las tres poblaciones p&lt; 0.001 lo que podría explicarse por la complejidad de su ciclo reproductivo. La Posada y Laguna Chica de San Pedro presentan déficit de heterocigotos (Fis). Los valores de Fst global (0.027) y AMOVA para la población total indican que estas poblaciones no están estructuradas lo que sugiere procesos de...
Tipo: Journal article
Palavras-chave: Diplodon chilensis; Desequilibrio gamético; Déficit de heterocigotos; Equilibrio Hardy-Weinberg; Sistemas lénticos.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200005

TAXONOMIC UPDATE OF THE SPECIES OF COPITARSIA HAMPSON 1906, (LEPIDOPTERA: NOCTUIDAE: CUCULLIINAE)
Provedor de dados: 72
Autores: Angulo,Andrés O.; Olivares,Tania S.
The present work is a catalogue of the species of Copitarsia Hampson, including twenty-one species from North to South America. Two species group are separated taxonomically. They are the species group turbata and the species group incommoda. Also new combinations as well as synonyms for some species are proposed. The genitalia male morphological characters of Copitarsia turbata (Herrich-Schaeffer) y Copitarsia incommoda (Walker) are illustrated
Tipo: Journal article
Palavras-chave: Lepidoptera; Noctuidae; Cuculliinae; Catalogue; Copitarsia Hampson new combinations; New synonymous; Host plants.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100005

Nuclear DNA content in the red conger eel Genypterus chilensis (Guichenot, 1881) (Actinopterygii: Ophidiidae)
Provedor de dados: 72
Autores: Jara-Seguel,Pedro; Ubilla,Andrea; Estrada,Juan; Ramírez,Diego; Valdebenito,Iván.
Studies about nuclear DNA content in the genus Genypterus are scarce, and the present study gives the first estimate of nuclear DNA content of Genypterus chilensis, with a value of 2C= 1.0 + 0.06 pg, value close to that obtained for other Ophidiidae species wich range between 1.2 and 1.68 pg.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200010

HAROLDO TORO GUTIERREZ
Provedor de dados: 72
Autores: Chiappa,Elizabeth.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100014

Estado de conocimiento de los Trichoptera de Chile
Provedor de dados: 72
Autores: Rojas A,Fresia.
Se presenta una visión actualizada del conocimiento de Trichoptera de Chile; dicha fauna de insectos, caracterizada por un alto grado de endemismo, está representada actualmente por 18 familias, 32 géneros y 214 especies. Hydrobiosidae se destaca por ser la familia con mayor diversidad: 20 géneros y 47 especies y por tener el mayor porcentaje de elementos endémicos, pero Limnephilidae por su abundancia y por el gran tamaño de los representantes de sus 27 especies, resulta ser el constituyente más característico de los cursos de agua de los bosques de fagáceas subantárticos de la Patagonia. Dentro de las familias de origen gondwánico, Helicophidae es la única rica en géneros (5) y especies (15). Se destaca también que el bajo número de formas acuáticas...
Tipo: Journal article
Palavras-chave: Trichoptera; Taxonomía; Endemismo; Investigación; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100011

ON THE ANNUAL CYCLE OF SATELLITE CHLOROPHYLL OFF CHILE (18°-40°S)
Provedor de dados: 72
Autores: Yuras,Gabriel; Ulloa,Osvaldo; Letelier,Ricardo; Pizarro,Oscar.
Satellite - derived oceanographic parameters were used to explain the coastal and oceanic behavior of the chlorophyll concentration (CHL) in Chilean waters (18°-40°S, coast- 900 km offshore). CHL shows two different regimens of the annual cycle, the closer to the shore one with a austral summer maximum in concordance to the upwelling and wind regimes; and an offshore one with a CHL maximum in winter time. The annual cycle is stronger in a thin band (20 km) close to the shore and in the oceanic zone, where it counts for more of the 80% of the variability present. There is a band, which varies with latitude, located between 100-200 km from coast where the annual cycle is not well resolved by the 100 km data bins used in this study. A EOF analysis of 9km...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300056

Life cycle of a freshwater Gondwanic remnant polychaete Stratiodrilus aeglaphilus (Annelida: Eunicida: Histriobdellidae), commensal with Aegla laevis (Crustacea: Anomura)
Provedor de dados: 72
Autores: VILA,IRMA; VÉLIZ,DAVID.
Within the Annelida phylum, the Histriobdellidae Family groups freshwater polychaetes sharing an ancient Gondwanic relationship; very little is known about their life histories. Here we describe the life cycle of Stratiodrilus aeglaphilus, an epibiont of the crab Aegla laevis, which inhabits rivers of central Chile. All its life stages were found associated with A. laevis. The presence of a chitinous penis and its larger size permit distinguishing males from females. The observation of larvae/embryos at different development stages allowed us determining the absence of a free-swimming larvae stage in this species; recently hatched juveniles have movements similar to those of adults. S. aeglaphilus shows direct development; different embryo development...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200005

MARINE WEATHER SYSTEMS: STUDY WITH ASEOS-II AMSR, AQUA AMSR-E AND ENVISAT ASAR
Provedor de dados: 72
Autores: Mitnik,Leonid M.; Mitnik,Maia L.; Dubina,Vyacheslav A.
Observations carried out by the Aqua AMSR-E (Advanced Microwave Scanning Radiometer), ADEOS-II AMSR and Envisat ASAR (Advanced Synthetic Aperture Radar) have been used to study the distribution of total water vapor content V, total cloud liquid water content Q, precipitation R and surface wind W in marine weather systems over the Northwestern Pacific Ocean. V, Q and W were retrieved from the measured brightness temperatures T B(n) with vertical and horizontal polarization at AMSR frequencies n with using of the developed algorithms. Strong gradients in the surface wind field existing at scales of a few kilometers and less are dramatically smoothed in AMSR data retrievals as follows from a comparison with Envisat ASAR images. Joint analysis of the...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300014

LA ALMEJA DE AGUA DULCE DIPLODON CHILENSIS (BIVALVIA:HYRIIDAE) POTENCIAL BIOFILTRO PARA DISMINUIR LOS NIVELES DE COLIFORMES EN POZOS: EXPERIMENTO DE LABORATORIO
Provedor de dados: 72
Autores: Lara,Gladys; Contreras,Angel; Encina,Francisco.
Estudios realizados en comunidades rurales de la IX Región, donde habitan familias que se abastecen con agua de pozo, se han detectado índices de coliformes fecales de hasta 5400 NMP en 100 ml, especialmente en pozos de baja profundidad. Considerando la capacidad de bombeo y de filtración de la almeja de agua dulce Diplodon chilensis, se realizó esta investigación tendiente a evaluar en el laboratorio la capacidad de las almejas para disminuir los niveles de coliformes en aguas de pozo así como de digerir la carga bacteriológica. Los resultados de los experimentos llevaron a concluir que densidades de 15 y 25 ejemplares en 30 litros de agua fueron capaces de disminuir la turbidez del agua y el número más probable de coliformes en un período de 6 horas...
Tipo: Journal article
Palavras-chave: Almeja de agua dulce; Diplodon chilensis; Biofiltro; Coliformes totales; Coliformes fecales; RAM; Aguas de pozo.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200005

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

¿QUE ESTA PASANDO CON LA ICTIOLOGIA EN CHILE HOY?
Provedor de dados: 72
Autores: Oyarzún,Ciro; Meléndez,Roberto.
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200011

SATELLITE MONITORING, METEOROLOGICAL AND OCEANOGRAPHIC CHARACTERISTICS FOR RED TIDE IN THE KOREAN COASTAL WATERS
Provedor de dados: 72
Autores: Yoon,Hong-Joo; Jeong,Jong-chul; Suh,Young-Sang.
It was studied the relationship between the red tide occurrence and the meteorological factors, and the satellite monitoring for red tide. From 1990 through 2001, the red tide continuously appeared and the number of red tide occurrence increased every year. A common condition for the red tide occurrence was heavy precipitation 2~4 days earlier, and the favorable conditions for the red tide formation were high air temperature, proper sunshine and light winds for the day in red tide occurrence. From satellite images, it was possible to monitor the spatial distributions and concentrations of red tide
Tipo: Journal article
Palavras-chave: Red tide; Meteorological factors; Remote sensing.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300050

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

ENSAYOS ECOTOXICOLOGICOS CON PETROLEO CRUDO, DIESEL 2 Y DIESEL 6 CON DOS SUBESPECIES DE BRACHIONUS PLICATILIS MÜLLER 1786 (ROTIFERA: MONOGONONTA)
Provedor de dados: 72
Autores: Alayo,Marianella; Iannacone,José.
plicatilis rotundiformis línea S y B. plicatilis hepatotomus línea L usándolo como una herramienta para evaluar el ambiente acuático y empleando la fracción soluble en agua (FSA) de tres hidrocarburos: Petroleo Crudo (PC), Diesel 2 (D2) y Diesel 6 (D6). Los valores de CL50 determinados para B. plicatilis rotundiformis a 24 y 48 h de exposición de FSA de PC, D2 y D6 fueron 0.13, 0.04; 0.65, 0.14 y 4.20, 0.33 mg/L, respectivamente. Los valores determinados de CL50 para B. plicatilis hepatotomus a 24 y 48 h de exposición de FSA de PC, D2 y D6 fueron 0.23, 0.05; 1.36, 0.13 y 3.47, 1.01 mg/L, entre los tres hidrocarburos evaluados. El orden de ecotoxicidad disminuyó a 24 y 48 h de exposición para ambas subespecies: petróleo crudo &gt; Diesel 2 &gt; Diesel 6. No...
Tipo: Journal article
Palavras-chave: Ecotoxicidad; Rotífero; Brachionus; Petróleo; Bioensayo; Fracción soluble en agua.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100007

NUEVA ESPECIE DEL GENERO ESTOLA FAIRMAIRE et GERMAIN 1859, PARA CHILE (COLEOPTERA: CERAMBYCIDAE, DESMIPHORINI)
Provedor de dados: 72
Autores: Barriga,Juan; Moore,Tomás; Cepeda,Danilo.
Se describe una nueva especie del género Estola para Chile, basado esencialmente en las figuras de genitalia masculina y femenina. Esta especie, que ataca la Araucaria araucana, se diferencia de las otras dos especies chilenas del género particularmente por su tamaño y por la forma de la espina del pronoto
Tipo: Journal article
Palavras-chave: Taxonomía; Cerambycidae; Lamiinae; Desmiphoriini; Estola kuscheli n. sp.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200015

HERPETOLOGICAL CATALOGUE OF MUSEO DEL MAR OF ARTURO PRAT UNIVERSITY, IQUIQUE, CHILE
Provedor de dados: 72
Autores: Moreno M,Rodrigo; Moreno,Jorge; Torres-Pérez,Fernando; Ortiz,Juan C.; Breskovic,Antonio.
The Herpetological Catalogue of Museo del Mar in Arturo Prat University is described. There are 100 specimens included in 29 species, 11 genera and six families
Tipo: Journal article
Palavras-chave: Herpetological Catalogue; Museo del Mar; Arturo Prat University; Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200006

REDESCRIPCION DE SACCOCOELIOIDES OCTAVUS SZIDAT 1970 Y S. BACILLIFORMIS SZIDAT, 1973 (DIGENEA, HAPLOPORIDAE), PARASITOS DE PECES DEL GENERO ASTYANAX BAIRD &amp;amp; GIRARD 1854 (PISCES: CHARACIDAE)
Provedor de dados: 72
Autores: Lunaschi,Lia I.
RESUMEN Se redescribe e ilustra a Saccocoelioides octavus &lt;A HREF="#szidat70"&gt;Szidat 1970&lt;/A&gt; y S. bacilliformis &lt;A HREF="#szidat73"&gt;Szidat, 1973&lt;/A&gt; (Digenea, Haploporidae) en base a material tipo depositado en la Colección Helmintológica del Museo Bernardino Rivadavia, Buenos Aires, Argentina. La descripción original de ambas especies es breve, imprecisa y los datos morfométricos de cada una están referidos a un solo espécimen. El estudio detallado de cinco especímenes tipo de S. octavus, colectados en los ciegos pilóricos de Astyanax fasciatus (Cuv.), del holotipo y siete paratipos de S. bacilliformis, colectados en los ciegos pilóricos de Astyanax bipunctatus, revela que ambas son morfológicamente y morfométricamente similares;...
Tipo: Journal article
Palavras-chave: Saccocoelioides octavus; Saccocoelioides bacilliformis; Haploporidae; Digenea; Astyanax; Characidae; Argentina.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100005

ZELUS CERVICALIS STÅL (HEMIPTERA: REDUVIIDAE: HARPACTORINAE), APORTE NEARTICO A LA ENTOMOFAUNA INTRODUCIDA EN CHILE
Provedor de dados: 72
Autores: Elgueta,Mario; Carpintero,Diego L.
Se da a conocer el establecimiento en Chile de Zelus cervicalis Stål, 1872, cuya introducción reciente en el país se asocia al tráfico comercial. Se entrega una breve caracterización, sinonimia, referencias bibliográficas, distribución geográfica conocida y una figura del adulto
Tipo: Journal article
Palavras-chave: Reduviidae; Zelus; Introducción; Chile central.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100010

ESTIMATION OF THE FRACTION OF CANOPY COVER FROM MULTISPECTRAL DATA TO BE USED IN A WATER SOIL EROSION PREDICTION MODEL
Provedor de dados: 72
Autores: González Lanteri,David; Huete,Alfredo; Kim,HoJin; Didan,Kamel.
Using the 16 day MODIS (aboard the EOS Terra satellite) 250m NDVI and ground biophysical and spectral measurements we established simple relationships between these parameters and the canopy cover. The canopy cover is used in water erosion models to estimate the amount of soil loss under precipitation events and specific geographic conditions. Two transects, in the grassland part of the Walnut Gulch Experimental Watershed (WGEW) located near the town of Tombstone in Arizona, were established for ground data collection. Ground measurements were performed every 16 days, to coincide with the Terra Satellite overpass. Erosion, in desert environment is a contributing factor to soil degradation and subsequently desertification. Erosion is strongly related with...
Tipo: Journal article
Palavras-chave: Canopy cover; MODIS; Soil erosion; Semi arid environment.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200043

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

NEW RECORDS OF SHRIMPS (DECAPODA: CARIDEA AND DENDROBRANCHIATA) IN DEEP WATERS OFF CHILE
Provedor de dados: 72
Autores: Guzmán,Guillermo; Quiroga,Eduardo.
Species of shrimps are revised based on bibliographic information and on specimens collected with an Agassiz trawl (AGT) during the PUCK-156 Expedition (2001) onboard R/V Sonne in three areas along Chilean coast; off Antofagasta (22° lat. S), off Concepción (36°lat. S) and off Chiloé (42° lat. S). 111 specimens belonging to 12 species were collected, including three new records for the Chilean fauna; Metacrangon procax, Nematocarcinus productus, and Merhyppolite sp. aff. M. americana. Presence of Nematocarcinus lanceopes, Lebbeus antarcticus, Pandalopsis ampla and Sclerocrangon atrox in the collected material allows extension of their distributional ranges from sub-Antarctic to temperate areas
Tipo: Journal article
Palavras-chave: Archibenthic shrimps; Dendobranchiata; Caridea; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200009

EVALUACION RAPIDA DE LA BIODIVERSIDAD EN CINCO SISTEMAS LENTICOS DE CHILE CENTRAL: MACROINVERTEBRADOS BENTONICOS
Provedor de dados: 72
Autores: Muñoz,Elsa; Mendoza,Gabriel; Valdovinos,Claudio.
En un sistema léntico los cambios en los niveles de trofía normalmente están acompañados de cambios estructurales en la biota. Una de las formas de establecer estos cambios estructurales en forma simple es a través de una evaluación rápida de la biodiversidad, realizada basándose en la discriminación de morfoespecies, sin tener que profundizar las identificaciones taxonómicas a niveles de género y especie. Se evaluó la biodiversidad de las comunidades de macroinvertebrados bentónicos de cinco lagos de la VIII Región de Chile (Chica y Grande de San Pedro, Lleu-Lleu, Quiñenco y Lanalhue), y se discute su asociación a distintos niveles de trofía. Se registró un total de 44 morfoespecies, la mayoría de los cuales corresponden a larvas de Insecta (39%), Acari...
Tipo: Journal article
Palavras-chave: Evaluación rápida de biodiversidad; Macroinvertebrados bentónicos; Ecosistemas lénticos; Eutrofización; Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200009

SEA LEVEL VARIATIONS IN ADJACENT SEAS OF KOSEA FROM TOPEX/POSEIDON
Provedor de dados: 72
Autores: YOUN,Yong-Hoon; PARK,Young-Hyang; SUH,Ae-Sook.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300053

SINGLE-PASS SEA/ICE DISCRIMINATION USING ERS-2 SCATTEROMETER DATA
Provedor de dados: 72
Autores: Neyt,Xavier; Pettiaux,Pauline; Manise,Nicolas; Acheroy,Marc.
This paper presents a new method to perform sea/ice discrimination in single-pass ERS-2 scatterometer data. Existing methods are 1rst reviewed and compared in a consistent framework. Next, the ice probability according to the individual existing methods is learned through the use of a neural network. Finally, the individual criteria are combined together in order to increase the sea-ice discrimination accuracy. The proposed method is shown to provide an acceptable performance even on single-pass data, i.e., without requiring temporal averaging
Tipo: Journal article
Palavras-chave: Scatterometry; Ice discrimination; Neural network.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300021

Satellite remote sensing of oil spill pollution in the southeastern Baltic Sea
Provedor de dados: 72
Autores: Kostianoy,A.G.; Lebedev,S.A.; Litovchenko,K.Ts.; Stanichny,S.V.; Pichuzhkina,O.E.
Shipping activities in the Baltic Sea, including oil transport and oil handled in harbors, have a number of negative impacts on the marine environment and coastal zone. Oil discharges from ships represent a significant threat to marine ecosystems. Oil spills cause the contamination of seawater, shores, and beaches, which may persist for several months and represent a threat to marine resources. One of the main tasks in the ecological monitoring of the Baltic Sea is an operational satellite and aerial detection of oil spillages, determination of their characteristics, establishment of the pollution sources and forecast of probable trajectories of the oil spill transport. Since 1993 there is no regular aerial surveillance of the oil spills in the Russian...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300002

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

Estado de conocimiento de las diatoméas dulceacuícolas de Chile
Provedor de dados: 72
Autores: Rivera Ramírez,Patricio.
Hasta 1917 la información existente sobre la flora diatomológica de aguas continentales de Chile provino de las publicaciones de investigadores extranjeros. A partir de 1967 las investigaciones se concentran en tres áreas de Chile: la zona central, el área de Concepción y la Región de Los Lagos. El conocimiento actual sobre esta flora es escaso y poco exacto, pues muchos de los taxa señalados han sido erróneamente determinados. Se considera como causales de este hecho la carencia de literatura especializada y la utilización de técnicas y de instrumental de investigación inadecuados. Se indica el número de artículos y de taxa señalados para el país, y se comentan las características de la única colección diatomológica existente. Finalmente se sugieren...
Tipo: Journal article
Palavras-chave: Diatomeas; Aguas continentales; Taxonomía; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100002

Material herpetológico colectado por Roberto Donoso Barros en Venezuela (excepto geckos) en el Museo de Zoologia de la Universidad de Concepción, Chile
Provedor de dados: 72
Autores: BARRIO-AMORÓS,CÉSAR L; ORTIZ,JUAN CARLOS.
Se revisa el material herpetológico recolectado por Roberto Donoso Barros en Venezuela entre los años 1963 y 1964, el cual se encuentra depositado en la colección de vertebrados de la Universidad de Concepción, Chile. Se ordena taxonómicamente respetando los conceptos actualmente establecidos. Por último, cuando es necesario se hacen comentarios de los ejemplares y especies con confusión taxonómica, haciendo énfasis en el material tipo descrito por este autor.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100008

Marine biodiversity in French Guiana: Estuarine, coastal, and shelf ecosystems under de influence of Amazonian waters
Provedor de dados: 72
Autores: Artigas,Luis Felipe; Vendeville,Philippe; Leopold,Marc; Guiral,Daniel; Ternon,Jean-François.
Marine biodiversity in French Guiana is strongly influenced by the amagon River waters of the river Amazon, which constitute a major structuring factor for the estuarine, coastal, and shelf marine ecosystems. Moreover, the marked seasonal and interannual variabilities play important roles in the stability or fluctuations in the environmental parameters that influence biodiversity at the ecological, population, and genetic levels. Previous and ongoing studies of the marine and littoral biota relate mostly to commercial marine species, protected species in danger of extinction and, specially, to the biodiversity and functioning of local coastal and littoral ecosystems such as estuaries, mudflats, sandy beaches and, particularly, littoral mangroves. A more...
Tipo: Journal article
Palavras-chave: French Guiana; Marine biodiversity; Coastal systems; Amazon river waters; Intertropical Convergence Zone; Ecological and conservation studies.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200013

Selección denso-dependiente de microhabitat en Galaxias platei: un estudio experimental
Provedor de dados: 72
Autores: Sobenes,Catterina; Link,Oscar; Habit,Evelyn.
Galaxias platei es la especie nativa de mayor distribución en la Patagonia Chilena, habitando ambientes fluviales y principalmente lacustres. Utiliza variados hábitats, desde plataformas de arcilla consolidada a ambientes de sustrato fino y otros con presencia de macrófitas, vegetación leñosa o sustrato rocoso grueso. En este trabajo analizamos experimentalmente la selección de microhábitat de G. platei y su dependencia con la disponibilidad de refugio y la densidad de peces que lo utilizan. Para ello diseñamos experimentos con distintos niveles de refugio a diferentes densidades. Se recrearon microhábitats con refugio de canto rodado (sustrato grueso) y refugio de vegetación acuática, y microhábitats sin refugio de grava (sustrato fino) y piedra plana...
Tipo: Journal article
Palavras-chave: Experimentación; Refugio; Interacción intraespecífica; Peces nativos; Patagonia.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100005

Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
Provedor de dados: 72
Autores: Rabalais,Nancy N.
The seasonal formation of a bottom-water layer severely depleted in dissolved oxygen has become a perennial occurrence on the Louisiana continental shelf adjacent to the Mississippi River system. Dramatic changes have occurred in this coastal ecosystem in the last half of the 20th century as the loads of dissolved inorganic nitrogen tripled. There are increases in primary production, shifts in phytoplankton community composition, changes in trophic interactions, and worsening severity of hypoxia. The river-influenced continental shelf is representative of similar ecosystems in which increased nutrient flux to the coastal ocean has resulted in eutrophication and subsequently hypoxia. The hypoxic conditions (dissolved oxygen less than 2 mg L-1) cover up to...
Tipo: Journal article
Palavras-chave: Anoxia; Hypoxia; Eutrophication; Nutrients; Nitrogen.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300015

UTILIZACION DE LA MORFOLOGIA DE LAS LARVAS MEROCERCOIDES PRESENTES EN MOLUSCOS, EN LA DILUCIDACION DE LA TAXONOMIA DE LAS ESPECIES DE RHODOBOTHRIUM (CESTODA: TETRAPHYLLIDEA)
Provedor de dados: 72
Autores: Carvajal,Juan; Mellado,Alex.
Los moluscos lamelibranquios han sido señalados como hospedadores intermediarios de los parásitos cestodos del orden Tetraphyllidea. Estos platelmintos culminan sus ciclos de vida en los elasmobranquios. En diversas partes del mundo se ha descrito una infinidad de larvas de cestodos del tipo Scolex pleuronectis parasitando molúscos bivalvos. En Chile, Bahamonde &amp;amp; López (1962) descubren 2 tipos de parásitos cestodos en la macha: un plerocercoide y un merocercoide, habitando respectivamente el intestino y la masa visceral de Mesodesma donacium Lamarck 1818. Mediante cultivos in vitro y disecciones de intestinos de rayas, se ha logrado observar cómo estas larvas se transforman en parásitos adultos (Hamilton &amp;amp; Byram 1974, Carvajal 1977,...
Tipo: Journal article
Palavras-chave: Rhodobothrium; Merocercoides; Cestodos; Lamelibranquios; Parásitos.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100012

TECAMEBIANOS (PROTOZOA: RHIZOPODA) DE UNA TURBERA DEL PARQUE NACIONAL PUYEHUE (40°45' S; 72°19' W), CHILE
Provedor de dados: 72
Autores: Zapata,Jaime; Yáñez,Miguel; Rudolph,Erich.
Las tecamebas son protozoos que habitan una amplia variedad de ambientes terrestres y de aguas dulces, incluyendo suelos húmedos, lagos, marismas, turberas, etc. Sus tecas o conchillas fósiles pueden ser recuperadas de los sedimentos en cantidades suficientes como para permitir la estimación de su abundancia relativa. El objetivo de este estudio fue entregar el primer antecedente descriptivo de la distribución de la tecamebofauna en la turbera localizada en el Parque Nacional Puyehue, Chile. Este estudio reveló 42 taxa pertenecientes a 9 familias y 15 géneros de tecamebas. Seis taxa (Arcella artocrea, Difflugia elegans, Euglypha sp. "A", Heleopera sp. "A", Hyalosphenia subflava y Nebela speciosa) no habían sido registradas previamente en Chile. Además, se...
Tipo: Journal article
Palavras-chave: Turbera; Sphagnum; Rhizopoda; Tecamebas.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100002

POBLACION DE EMERITA ANALOGA (STIMPSON 1857) EN PLAYAS AMARILLA Y RINCONADA, ANTOFAGASTA: ASPECTOS ABIOTICOS, BIOTICOS Y CONCENTRACION DE COBRE
Provedor de dados: 72
Autores: Lépez,Irene; Furet,Luis; Aracena,Olga.
Las especies del género Emerita son decápodos anomuros pertenecientes a la clase Crustacea, muy comunes en las playas de arena. Emerita analoga (Stimpson 1857) extiende su distribución desde Alaska hasta Argentina, faltando sólo en la zona tropical con temperaturas superiores a 20&amp;deg;C y vive en los niveles medio e inferior del intermareal, especialmente en playas expuestas. Esta especie es común en la zona costera de Antofagasta donde Minera Escondida Ltda. realiza embarques de cobre, con el potencial peligro de fugas que alteren la biota marina aledaña. Por esta razón y por ser considerada un buen indicador de alteraciones ambientales, Minera Escondida Ltda. financió este estudio con los siguientes objetivos: 1) Describir los principales parámetros...
Tipo: Journal article
Palavras-chave: Población; Emerita analoga; Cobre; Antofagasta.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000100008

Visión sinóptica de los macrofitos dulceacuícolas de Chile
Provedor de dados: 72
Autores: Hauenstein,Enrique.
En base a revisión bibliográfica, se realizó una sinopsis del estado del arte de las macrófitas vasculares de ecosistemas acuáticos continentales de Chile. Se registró un total de 455 especies de macrófitas acuáticas, de las cuales 3 corresponden a gimnospermas, 15 a pteridófitos, 184 a monocotiledóneas y 253 a dicotiledóneas. De éstas, sólo 62 son hidrófitas típicas. El total de estas macrófitas representa el 8,7% de la flora de Chile continental, y las hidrófitas sólo el 1,2%. Respecto de su origen fitogeográfico, destaca el alto porcentaje de especies nativas (79,3%) sobre las introducidas (20,7%). En cuanto a su estado de conservación, sólo las gimnospermas y pteridófitos tienen claramente definida esta condición; de las 18 especies registradas en...
Tipo: Journal article
Palavras-chave: Macrófitos acuáticos; Hidrófitas; Ecosistemas acuáticos continentales; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100004

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 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

ESTIMATION OF THE AIR TEMPERATURE OVER THE OCEAN BASED ON SATELLITE DATA
Provedor de dados: 72
Autores: Kim,Y. S; Kwon,B. H; Hong,K. M.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200057

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

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

Estado de conocimiento de los tecamebianos dulceacuícolas de Chile
Provedor de dados: 72
Autores: Zapata Madrid,Jaime.
Las tecamebas son un grupo de protozoos que viven principalmente en las comunidades acuáticas y de ambientes húmedos (suelos, turberas, etc.), en donde juegan un importante rol como descomponedoras de celulosa y lignina; además participan activamente en diversos procesos biológicos que ocurren en los ecosistemas acuáticos. Con respecto al conocimiento de las tecamebas en Chile, éste se mantiene en un estado muy incipiente, de ahí la necesidad de contar con más especialistas, ya que este grupo está adquiriendo cada vez más importancia por su uso en problemas de paleolimnología, como bioindicadores de ambientes lacustres contaminados, como indicadores pedológicos, entre otros.
Tipo: Journal article
Palavras-chave: Protozoa; Tecamebas; Taxonomía; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100006

THE SEASONAL CYCLE OF SURFACE CHLOROPHYLL ALONG THE PERUVIAN COAST: COMPARISON BETWEEN SEAWIFS SATELLITE OBSERVATIONS AND DYNAMICAL/BIOGEOCHEMICAL COUPLED MODEL SIMULATIONS
Provedor de dados: 72
Autores: Echevin,Vincent; Aumont,Olivier; Tam,Jorge; Pasapera,Jose.
The seasonal cycle of surface chlorophyll along the Peruvian coasts is studied with SeaWiFS satellite observations and coupled dynamical/biogeochemical ORCA/PISCES model simulations. The observed mean spatial structure of surface chlorophyll is shown to be in good agreement with that of the model. However the seasonal cycles contrast: whereas the model produces a spring bloom consistent with maximum upwelling and deepest mixed layer in the winter season, the observed seasonal cycle shows two distinct blooms one in late spring-early summer and other in fall. Several hypotheses are suggested to explain the fall bloom and its non-occurrence in the model
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200059

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

PRIMER REGISTRO DE BASILIA SILVAE (DIPTERA: NYCTERIBIIDAE) SOBRE HISTIOTUS MONTANUS (CHIROPTERA: VESPERTILIONIDAE) EN CHILE
Provedor de dados: 72
Autores: Muñoz,Lisandro E; González,Daniel A; Fernández,Ignacio.
Se informa el hallazgo de tres ejemplares de Basilia silvae (Brèthes, 1913) sobre un ejemplar de Histiotus montanus (Philippi &amp;amp; Landbeck, 1861) capturado en la ciudad de Chillán, Chile, constituyéndose en el primer registro confirmado de Basilia silvae sobre este quiróptero y la primera cita para la Provincia de Ñuble
Tipo: Journal article
Palavras-chave: Diptera; Nycteribiidae; Basilia; Ectoparásitos; Murcielagos; Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200015

MORPHOLOGICAL AND ANATOMICAL FEATURES OF FLAMMULINA FESTIVA SCOTT, 1970 (STYLOMMATOPHORA; CHAROPIDAE) FROM SOUTHERN CHILE, WITH NOTES ON ITS NATURAL HISTORY
Provedor de dados: 72
Autores: Cádiz,Francisco J; Gallardo,Carlos S.
Flammulina festiva Scott, 1970 is a terrestrial gastropod endemic to southern Chile. Characteristics of living specimens, including the anatomy of the excretory and reproductive systems of this species are here reported for the first time. The excretory system of this species is of the charopid type with a short, curved primary ureter, and a secondary ureter which extends to the excretory sinus. The reproductive system exhibits characteristics similar to other Charopidae. There is an ovotestis that is divided into seven lobes, a well-developed albumin gland, an ovospermial duct with a proximally diverticulate, distally undivided prostatic gland, plus a short oviduct. The terminal portion of the system shows a pointed epiphallus, and a phallus within a...
Tipo: Journal article
Palavras-chave: Flammulina festiva; Gastropoda; Excretory system; Reproductive system; Charopidae; Chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100001

Oxygen deficiency in the north indian ocean
Provedor de dados: 72
Autores: Naqvi,S.W.A.
The Indian Ocean contains one of the oceans' most pronounced oxygen minimum zones (OMZ), which, anomalously, is the most intense in the northwestern sector (Arabian Sea). It also contains the majority of the area of oceanic continental margins in contact with oxygen-depleted waters. Impacts of the oxygen deficiency on regional biogeochemistry, especially anaerobic nitrogen transformations, are described. A comparison of the perennial, mesopelagic OMZ in the open Northwestern Indian Ocean is made with a shallower oxygen deficient system that develops seasonally (during late summer and autumn) over the western Indian shelf. The latter appears to have intensified in recent years presumably due to anthropogenic nutrient loading from land.
Tipo: Journal article
Palavras-chave: Indian Ocean; Nitrogen cycling; Denitrification; N2O; Eutrophication.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300011

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

SEMBLANZA DE DON TOMÁS CEKÁLOVIC KUSCHEVICH
Provedor de dados: 72
Autores: Urbina Burgos,Medardo.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200010

EL ESTADO ACTUAL DEL HUEMUL (HIPPOCAMELUS BISULCUS) EN CHILE CENTRAL
Provedor de dados: 72
Autores: Povilitis,Anthony.
La única población sobreviviente del huemul en Chile central (Los Nevados de Chillán) se encuentra en un descenso clásico hacia la extinción. Se utilizan los datos de prospecciones en terreno por el período entre 1975 a 2002 para estimar el tamaño, la estructura espacial y la tendencia de la población. Un análisis de la población en 1997 arrojó un mínimo de 60 huemules en 12 sitios, y una declinación de un 58% en la población durante un período de dos décadas. Prospecciones recientes entre 1998-2002 indican que la población de huemules ha continuado disminuyendo a 40 individuos en 11 sitios, lo que representa un descenso adicional de un 33%. Desde el año 1987, los huemules han desaparecido de 5, y posiblemente 8, sitios de hábitat primario. Solamente un...
Tipo: Journal article
Palavras-chave: Hippocamelus bisulcus; Ciervo huemul en peligro; Amenazas; Conservación; Chile central.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100008

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

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

First record of a ceramiaceous red algal species, Ceramium stichidiosum, from magellanic region, chile
Provedor de dados: 72
Autores: Mansilla,Andrés; Navarro,Nelso P; Fujii,Mutue T.
A ceramiaceous red alga, Ceramium stichidiosum J. Agardh was found for the first time in waters of Magellanic Strait, Chile. Thalli are usually epiphytic on other macroalgae such as Mazzaella laminarioides (Bory) Fredericq and Sarcothalia crispata (Bory) Leister. They have fully corticated axes with alternate to dichotomous branches, straight tips and six periaxial cells per each axial cell. This report extends the distribution limit of C. stichidiosum from the X Región de los Lagos (42º 58'S; 74º 19'W) to the XII Región de Magallanes (53°37'S; 70°59'W).
Tipo: Journal article
Palavras-chave: Ceramium; Ceramium stichidiosum; Chile; Geographical distribution; Rhodophyta; Taxonomy.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200012

Oceanic fronts in the southern Indian Ocean as inferred from the NOAA SST, TOPEX/Poseidon and ERS-2 altimetry data
Provedor de dados: 72
Autores: Kostianoy,A.G.; Ginzburg,A.I.; Lebedev,S.A.; Frankignoulle,M.; Delille,B.
Weekly NODS/MCSST (the NASA Ocean Data System/Multi-Channel Sea Surface Temperature) dataset was used to investigate detailed structure and space-time variability of large-scale fronts in the Southern Indian Ocean (30°60°S and 20°150°E) during the period of 1997-1999. The constructed SST gradient maps for 36 mid-month weeks gave simultaneous viewing of five basic fronts in the whole basin: the North and South Subtropical fronts, the Agulhas Front, the Subantarctic Front, and the Polar Front. Mean location, SST and SST gradients with corresponding standard deviations were calculated for every front at each 10°-spaced longitude. SST gradient maps and charts of sea level anomalies (SLA) based on the combined altimetry data from the TOPEX/Poseidon and ERS-2...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300003

Selección denso-dependiente de microhabitat en Galaxias platei: un estudio experimental
Provedor de dados: 72
Autores: Sobenes,Catterina; Link,Oscar; Habit,Evelyn.
Galaxias platei es la especie nativa de mayor distribución en la Patagonia Chilena, habitando ambientes fluviales y principalmente lacustres. Utiliza variados hábitats, desde plataformas de arcilla consolidada a ambientes de sustrato fino y otros con presencia de macrófitas, vegetación leñosa o sustrato rocoso grueso. En este trabajo analizamos experimentalmente la selección de microhábitat de G. platei y su dependencia con la disponibilidad de refugio y la densidad de peces que lo utilizan. Para ello diseñamos experimentos con distintos niveles de refugio a diferentes densidades. Se recrearon microhábitats con refugio de canto rodado (sustrato grueso) y refugio de vegetación acuática, y microhábitats sin refugio de grava (sustrato fino) y piedra plana...
Tipo: Journal article
Palavras-chave: Experimentación; Refugio; Interacción intraespecífica; Peces nativos; Patagonia.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200003

Parásitos del pez luna Mola mola (Pisces: Molidae). Primer registro en aguas de la costa centro sur de Chile
Provedor de dados: 72
Autores: Fernández,Italo; Oyarzún,Ciro; Valenzuela,Ariel; Burgos,Carolina; Guaquín,Víctor; Campos,Víctor.
RESUMEN Este estudio reporta los parásitos presentes en un ejemplar de Mola mola, encontrado en la costa de Tomé, Chile, durante el mes de octubre de 2014. Se aislaron estados adultos de los digeneos Accacladium serpentulum y Accacladocoelium macrocotyle, del cestodo Anchistrocephalus microcephalus y del copépodo Cecrops latreillii. Además, se identificaron larvas de tercer estado del nematodo Anisakis sp. Tipo I, sensu Berland, 1961 (tercer estadio, L3) y plerocerci del cestodo Molicola horridus. Los resultados demuestran la participación de M. mola como hospedero definitivo, intermediario o paraténico en los ciclos de vida de los parásitos en el presente estudio.
Tipo: Journal article
Palavras-chave: Parasitismo; Ciclos de vida; Patología.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200192

EVALUACION CUALITATIVA Y CUANTITATIVA DE LA OFERTA Y COSECHA DE BIOMASA HERBACEA POR ACROMYRMEX STRIATUS ROGER (HYMENOPTERA FORMICIDAE) EN LA PROVINCIA DE LA PAMPA, ARGENTINA
Provedor de dados: 72
Autores: Armani,Ana; Quirán,Estela.
In this paper we present a qualitative and quantitative evaluation of the supply and harvest of herbaceous biomass of the Acromyrmex striatus ant at a site in Santa Rosa city, La Pampa province, Argentina (36º28' S 64º35' W). Annual input of green material to the nest was 0,14 kg/year.nest and 0,60 kg/(year.hectare); which is the lowest value reported for species of this genus. In the region studied, Acromyrmex striatus primarily cuts monocotyledonous, harvesting small amounts of all available plants. The presence of Acromyrmex striatus in this semiarid area would not decrease the availability of native grasses preferred by cattle
Tipo: Journal article
Palavras-chave: Consumption; Disponibility; Vegetable patch; Cutting ants; Monocotyledonous; Argentina.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200010

Shore Fishes of Easter Island, John E. Randall &amp;amp; Alfredo Cea Egaña
Provedor de dados: 72
Autores: Pequeño,Germán.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200011

HERPETOFAUNA DEL PARQUE NACIONAL LLANOS DE CHALLE (III REGION, CHILE)
Provedor de dados: 72
Autores: Moreno,Rodrigo; Moreno,Jorge; Ortiz,Juan Carlos; Victoriano,Pedro; Torres-Pérez,Fernando.
RESUMEN El Parque Nacional Llanos de Challe se encuentra ubicado en el desierto costero de Huasco, III Región de Atacama (Chile), con un área total de 45.708 ha. Se caracteriza por presentar un clima desértico costero con nubosidad abundante y ser representativo de la subregión ecológica del desierto costero. Entre los años 1997 y 1998 se realizaron prospecciones herpetológicas determinándose ocho especies, pertenecientes a cinco familias y seis géneros. Se discute la importancia del conocimiento a nivel específico de la herpetofauna en áreas destinadas para la conservación de la biodiversidad
Tipo: Journal article
Palavras-chave: Parque Nacional Llanos de Challe; Herpetofauna; Conservación; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100002

REMOTE SENSING OF THE SEDIMENTATION PLUME OF THE RIVER SAN JUAN
Provedor de dados: 72
Autores: Ballestero,Daniel.
The River San Juan (RSJ), in the border between Nicaragua and Costa Rica, is one the major rivers in Central America and drains the largest basin in the region (38570 km²) in terms of volume. Extending from Lago Cicibolca to the Caribbean Sea, the RSJ is an important source of freshwater, sediments, nutrients and pollutants to the continental shelf. Ecosystems degradation, contamination of water bodies and overexploitation of natural resources, particularly deforestation in the southern part of the basin, modified and incremented sedimentation processes in the basin and the coastal margin during the last few decades. Advanced Very High Resolution Radiometer and Sea-viewing Wide Field-of-view Sensor data, together with in-situ CTD, current meter, turbidity...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200004

Nonlinear correlation by using invariant identity vectors signatures to identify plankton
Provedor de dados: 72
Autores: Fimbres-Castro,Claudia; Álvarez-Borrego,Josué; Vázquez-Martínez,Irene; Espinoza-Carreón,T. Leticia; Ulloa-Pérez,A. Elsi; Bueno-Ibarra,Mario A.
In this paper a new methodology to recognize radk&gt;larians is presented. This system is invariant to position, rotation and scale by using identity vectors signatures (Is) obtained for both the target and the problem image. In this application, / is obtained by means of a simplification of the main features of the original image in addition of the properties of the Fourier transform. Identity vectors signatures are compared using nonlinear correlation. This new methodology recognizes objects in a more simple way. It has a low computational cost of approximately 0.02 s per image. In addition, the statistics of Euclidean distances is used as an alternative methodology for comparison of the identity vectors signatures. Also, experiments were carried out in...
Tipo: Journal article
Palavras-chave: Image processing; Invariant digital system; Pattern recognition; Plankton identification.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200005

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

Effect of PHA and LPS on the Activity of Nonspecific Cytotoxic Cells and Macrophages of Rainbow Trout (Oncorhynchus mykiss)
Provedor de dados: 72
Autores: Gómez,Leonardo A; Cortés,Raúl; Smith,Carlos T.
This work studied the effect of the lectin phytohaemagglutinin (PHA) and bacterial lipopolysaccharide (LPS) on the activity of nonspecific cytotoxic cells (NCCs) and macrophages of peripheral blood in the rainbow trout. NCCs are cells of the innate immunity, homologues to Natural Killer (NK) cells of mammals, capable of eliminating cells infected with intracellular pathogens and also tumoral cells. Their lytic activity is mediated by the perforin/granzyme system and the Fas receptor-Fas ligand (FasR-FasL) system. Activity of NCCs was evaluated by their capacity to lyse HL-60 tumor cells. On the other hand, macrophages eliminate microorganisms by several mechanisms, including the production of reactive oxygen species (ROS) and nitric oxide (NO). Results...
Tipo: Journal article
Palavras-chave: Interleukins; Innate immunity; FasR-FasL; Lectins; Leukocytes.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100007

QUANTITATIVE KARYOTYPE OF DIPLODON CHILENSIS (GRAY 1828) (BIVALVIA:HYRIIDAE)
Provedor de dados: 72
Autores: Jara-Seguel,Pedro; Peredo,Santiago; Palma-Rojas,Claudio; Parada,Esperanza; Lara,Gladys.
The karyotype of a freshwater population of Diplodon chilensis located in La Poza area of the Villarrica Lake (39º18'S; 72º05'W), Southern Chile, was studied. The chromosomes were obtained by squash of cleaving embryos, previously treated with colchicine and fixed in ethanol-acetic acid 3:1 at 4ºC and stained using the Feulgen reaction. Diplodon chilensis showed a diploid karyotype of 2n = 34, with metacentric and submetacentric chromosomes. This work is the first approach to cytogenetic characterization of Chilean populations of this species.
Tipo: Journal article
Palavras-chave: Hyriidae; Diplodon chilensis; Karyotype; Freshwater; Bivalves; Southern Chile; Hyriidae; Diplodon chilensis; Cariotipo; Bivalvos dulceacuícolas; Sur de Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200008

MESOSCALE EDDIES AND PELAGIC FISHERY OFF CENTRAL CHILE (33-40°S)
Provedor de dados: 72
Autores: Hormazabal,S; Núñez,S; Arcos,D; Espindola,F; Yuras,G.
The rich biological productivity within the Peru-Chile current system depends mainly on wind-driven coastal upwelling, which brings colder, nutrient-rich, subsurface waters into the illuminated upper layer, promoting high phytoplankton productivity whish is available for zooplankton and ultimately for fish. Off central Chile (29-39°S), where strong mesoscale eddies and meanders characterize the Coastal Transition Zone (CTZ), we are using hydrographic data, hydroacustic fish-biomass data and satellite information of wind stress, sea level anomalies and chlorophyll, to investigate linkages between mesoscale eddies and meanders and pelagic fish spatial variability. Satellite and in situ data showed that mesoscale structures have a strong association with...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200053

PERSPECTIVES OF MARINE BIODIVERSITY STUDIES IN ARGENTINA
Provedor de dados: 72
Autores: Lutz,Vivian A; Boschi,Enrique E; Bremec,Claudia S.; Cousseau,María Berta; Figueroa,Daniel E.; Rodríguez,Diego H.; Scarlato,Norberto; Viñas,María Delia; Lewis,Mirtha N.; Penchaszadeh,Pablo E.; Acuña,Fabián H; Aguirre,Marina L.; Akselman,Rut; Alder,Viviana A.; Baldoni,Ana; Barría,María S.; Bastida,Ricardo O.; Boraso,Alicia S.; Calvo,Jorge; Campagna,Claudio; Cañete,Guillermo; Cassia,María C.; Cervellini,Patricia M.; Chiaramonte,Gustavo E.; Costagliola,Marcela; Cosulich,Guillermina; Daponte,María C.; Díaz de Astarloa,Juan M.; Elías,Rodolfo; Esnal,Graciela B.; Excoffon,Adriana C.; Freije,Hugo; García de la Rosa,Susana; Genzano,Gabriel N.; Giberto,Diego A.; Guerrero,Raúl; Helbling,Walter; Hoffmeyer,Mónica S.; Incorvaia,Inés S.; Iribarne,Oscar; Jaureguizar,Andrés J.; Kogan,Mariela; Lovrich,Gustavo A; Madirolas,Adrián O.; Martin,Juan P.; Martos,Patricia; Mendoza,María L.; Marque,Silvina Menu; Mianzán,Hermes W.; Morriconi,Elba R.; Negri,Rubén M.; Obenat,Sandra; Pastor de Ward,Catalina T.; Pérez de Fankhauser,Laura B.; Quintana,Flavio; Reta,Raúl; Rico,Rita; Roux,Ana M.; Sabatini,Marina E.; Scelzo,Marcelo A.; Schejter,Laura; Schiavini,Adrián C.M.; Silva,Ricardo I.; Silvoni,María G.; Spivak,Eduardo; Trucco,María I.; Vallarino,Eduardo A.; Zelaya,Diego G.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200016

GRIDDED SURFACE WIND-STRESS PRODUCT OVER THE WORLD OCEAN CONSTRUCTED BY SATELLITE SCATTEROMETER DATA AND ITS COMPARISON WITH NWP PRODUCTS
Provedor de dados: 72
Autores: Kutsuwada,Kunio; Kasahara,Minoru; Aoki,Kunihiro.
Products of gridded surface wind and wind-stress vectors over the world ocean are constructed by satellite scatterometer (ERS-1/2 and Qscat/SeaWinds) data with highly temporal and spatial resolutions. Data of the ERS-1/2 and the Qscat/SeaWinds cover periods of 1992-2000 and since August 1999, respectively, and permit us to establish a long-term time series. We make validation for our products by inter-comparison with in-situ data (TAO and NDBC buoys), and find that our Qscat product has high reliability in the almost whole area around buoy locations. For areas where there are no in-situ data such as the high-latitude southern ocean, we also make inter-comparison of our products with numerical weather prediction(NWP) ones (NCEP and ECMWF). Results reveal...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300006

FISH IMMUNE SYSTEM
Provedor de dados: 72
Autores: Olabuenaga,Susana E.
The defence against infections is the essential function of the immune system of all Vertebrates. Fish present an efficient and developed immunologic response and in the case of Teleosts, with some similarities to the higher vertebrates. It can be divided into two types: innate or non specific and adquired or specific, both with a humoral and cellular compartments. Their relative importance can change according to the age of fish and is always under the influence of different factors. The most relevant components are mentioned here. There are two factors in fishes which strongly influence the immune response and antibody production, seasonal changes and temperature. The main lymphoid organs are described here: the thymus, the kidney and the spleen, as well...
Tipo: Journal article
Palavras-chave: Antigen; Antibody; Leukocytes; Phagocytosis; Lymphokines; Inflammation; Immunostimulants.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200010

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

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

HERPETOFAUNA DE SIERRA DE LAS QUIJADAS ( SAN LUIS, ARGENTINA)
Provedor de dados: 72
Autores: Guerreiro,Analía; Baldoni,J. C.; Brigada,Ana M.
El Parque Nacional Sierra de las Quijadas se encuentra ubicado al noroeste de la provincia de San Luis. Fue creado en 1990 a fin de preservar parte del ecosistema semiárido, presentando una biodiversidad característica de un ambiente ecotonal de las provincias fitogeográficas del Chaco y del El Monte. En este trabajo se presenta una lista actualizada de anfibios y reptiles, integrada por 25 especies correspondientes a las familias Bufonidae (1), Leptodactyllidae (5), Testudinidae (1), Gekkonidae (3), Teiidae (3), Tropiduridae (3), Polychrotidae (1), Amphisbaenidae (1), Boidae (1), Colubridae (4) y Viperidae (2). Las especies Proctrotretus doellojuradoi, Homonota fasciata, Anops kingi y Bothrops alternatus corresponden a nuevas citas para el Parque Nacional...
Tipo: Journal article
Palavras-chave: Diversidad anfibios reptiles Parque Nacional; San Luis.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100002

OVIPOSITION BEHAVIOUR IN FOUR SPECIES OF DROSOPHILA
Provedor de dados: 72
Autores: Alamiri,Zaid.
Oviposition site selection plays a central role in the evolutionary ecology of Drosophila, due to its high relation with the pre-adults fitness since the site selection determines the interactions between the species sharing common resources. Drosophila subobscura Collin which was detected in Chile for the first time in 1978, was found coexisting in the wild, as adults, over apple and raspberry, with D. hydei, D. immigrans and D. melanogaster. It was observed that raspberry has been used only by Drosophila subobscura as a breeding site; meanwhile sharing apple with the others. Our principal purpose was to shed light on the ecological significance of the new species oviposition behaviour; analysing also some of the preference-performance relationship. Two...
Tipo: Journal article
Palavras-chave: Oviposition behaviour; D. subobscura; Colonisation; Preference - performance relationship; Substrate physical characters.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200001

The sediment microorganisms under the oxygen minimum zone: present day analogs of precambrian oceans?
Provedor de dados: 72
Autores: Gallardo,Victor Ariel; Espinoza,Carola.
A review of the latest findings relating big filamentous sublittoral bacteria of sediments under the oxygen minimum zone (OMZ) of the eastern Pacific, and, on the basis of associated morphological and environmental factors, an analysis and comparison of extant and Precambrian similar benthic microorganisms is performed. Based on the similarity between the two communities and the fact that certain features presented by extant bacterial mats may explain a special type of Precambrian stromatolites, i.e., the microbialites, we suggest that both extant big filamentous bacteria and their mats may represent analogs of those existing in Precambrian oceans providing opportunities for research and clues on the evolution of early life in the ocean's shelf sediments...
Tipo: Journal article
Palavras-chave: Sediment bacteria; Big bacteria; Microfossils; Precambrian; Proterozoic; Stromatolites; Microbialites; Bacterial mats.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300006

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

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

Estado de conocimiento de los parásitos Eumetazoos de organismos Dulceacuícolas de Chile
Provedor de dados: 72
Autores: Olmos,Viviana; Muñoz,Gabriela.
La fauna de parásitos metazoos de organismos acuáticos y semiacuáticos en ecosistemas continentales de Chile está constituida por aproximadamente 60 taxa parasitarios. Un 47% de las infecciones están identificadas a nivel de especies, y un 53% como género o familia. Estos parásitos se encuentran integrados por 5 phyla (Arthropoda, Acanthocephala, Nematoda, Platyhelminthes y Myxozoa); con un total de 8 clases, 19 órdenes y 31 familias. El phylum Platyhelminthes fue el más diverso, compuesto por 3 clases, 11 órdenes y 19 familias, y Digenea la clase que contó con el mayor número de especies. Un 48% de los parásitos registrados a nivel de especie son endémicos y un 71% de ellos se encuentran en hospedadores anfibios. La distribución de parásitos de...
Tipo: Journal article
Palavras-chave: Ecosistemas dulceacuícolas; Diversidad; Conservación; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100018

PRIMER REGISTRO DE MANTA BIROSTRIS (DONNDORFF 1798) (BATOIDEA: MOBULIDAE) EN EL RIO DE LA PLATA, URUGUAY
Provedor de dados: 72
Autores: Milessi,Andrés C.; Oddone,María Cristina.
Se registró la presencia de un macho de la mantarraya Manta birostris (Donndorff 1798) en la desembocadura del arroyo Pando (34° 48' S-55° 43' O), Río de la Plata, Uruguay. El ancho del disco fue de 4.20 m con un peso estimado de 900 kg. Este hallazgo es el primer registro de M. birostris para las costas uruguayas y representa una ampliación, hacia el sur, del área de distribución de esta especie en el Océano Atlántico sudoccidental. Se discute, además, la ocurrencia de esta especie oceánica en aguas estuarinas
Tipo: Journal article
Palavras-chave: Manta birostris distribución; Atlántico sudoccidental Chondricthyes.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100017

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

MODELING OF RADIATION CHARACTERISTICS IN OPTICALLY THICK LAYERS FOR REMOTE SENSING PROBLEMS
Provedor de dados: 72
Autores: Sushkevich,Tamara A.; Strelkov,Sergey A.; Vladimirova,Ekaterina V.; Maksakova,Sveta V.; Kulikov,Alexey K.; Ignatijeva,Ekaterina I.; Volkovich,Alex N.
Boundary-value problem of radiation transfer in optically thick layers is considered while describing ocean, cloudiness, aerosol particle outbreaks, dust traces and other specific effects resulted from large fires (forest, peat-lands, in steppe regions, anthropogenic). Space and angular distributions of radiation inside the relevant layer of these media as well as reflected and passed through the layer radiation are formed as a result of multiple scattering and absorption. A new approach has been proposed to radiation transfer modeling in thick layers based on an influence function method. An internal border is inferred that separates the relevant layer on two regions. The influence function is calculated in the first region as a complete solution of the...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300044

Fe de erratas
Provedor de dados: 72
Autores: Cuevas P,César.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000100008

REVALUATION OF LATRODECTUS THORACICUS NICOLET, 1849 (ARANEAE: THERIDIIDAE): BIOLOGICAL AND PHYLOGENETIC ANTECEDENTS
Provedor de dados: 72
Autores: Aguilera,Milenko A; D'Elía,Guillermo; Casanueva,María E.
The number and identity of the species of black widow spiders of the genus Latrodectus that inhabit Chile remain unclear. Here we present results of taxonomic work based on morphologic and molecular characters of a large series of specimens collected throughout Chile, which aimed to assess Chilean Latrodectus diversity. Results show that all studied populations belong to a single species, for which the correct name is Latrodectus thoracicus Nicolet 1849. Therefore, we remove this taxon from the synonymy of L. mactans (Fabricius, 1775). In addition, we suggest that L. mirabilis (Holmberg, 1876) may be junior synonym of L. thoracicus. We recognize two species of black widows for continental Chile, L. thoracicus andi. variegatus Nicolet, 1849. We provided an...
Tipo: Journal article
Palavras-chave: Chile; Species limits; Taxonomy; Black widows.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000200001

THE CONTRIBUTION OF SATELLITE OBSERVATIONS ON FORECASTS OF SEA STATE OVER THE LAST DECADE, AND THE POTENTIAL IMPACT OF NEW CONFIGURATIONS OVER THE NEXT
Provedor de dados: 72
Autores: Allan,Tom.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200003

First report of fibroma in huemul (Hippocamelus bisulcus Molina 1782)
Provedor de dados: 72
Autores: HINOJOSA,ANA; BLUMER,EVAN; CAMACHO,AMY; SILVA,ALEJANDRA; QUEZADA,MANUEL; BREVIS,CRISTINA.
An adult female huemul (Hippocamelus bisculcus), captured in Bernardo O’Higgins National Park, Chile, had melanic lesions on a large part of her body. After a histological analysis, these lesions were diagnosed as Fibroma. This is a common pathology for several deers of the world. However, we report the first medical study for the huemul deer.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200006

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

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

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

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

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

MARINE LIFE OF URUGUAY: CRITICAL UPDATE AND PRIORITIES FOR FUTURE RESEARCH
Provedor de dados: 72
Autores: Calliari,Danilo; Defeo,Omar; Cervetto,Guillermo; Gómez,Mónica; Giménez,Luis; Scarabino,Fabrizio; Brazeiro,Alejandro; Norbis,Walter.
The marine areas of Uruguay consist of the Río de la Plata estuary and the adjacent shelf and slope, part of the Subtropical Convergence Ecosystem. In this paper, the main advances in the knowledge of marine life in these areas (the known) are reviewed in order to discuss future lines of research (the unknown). Information has been separately analysed for the plankton, nekton, and benthos in each of 3 areas-the littoral, the shelfs and the "open ocean". Current knowledge of marine life is uneven among the groups and areas. In the case of the plankton, research has concentrated on the near-shore waters and focused on taxonomy and distribution. Little is known about the responses of organisms to environmental variability and about biological processes. The...
Tipo: Journal article
Palavras-chave: Marine life; Biodiversity; Río de la Plata; Atlantic Ocean; Uruguay.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200015

Estado de conocimiento de los Plecopteros de Chile
Provedor de dados: 72
Autores: Vera,Alejandro; Camousseight,Ariel.
Se analiza el actual conocimiento del Orden en Chile, enfatizando los aspectos taxonómicos útiles para el trabajo limnológico, como son, el grado de discriminación que es posible lograr a través de los estados preimaginales y la distribución geográfica de las especies. Los resultados obtenidos revelan un total de 63 especies distribuidas en 33 géneros y 6 familias. El endemismo en Chile alcanza un 57%.
Tipo: Journal article
Palavras-chave: Lista taxonómica; Plecoptera; Chile; Distribución.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100010

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

ESTIMATING POLYNYA CLOUDINESS
Provedor de dados: 72
Autores: Key,Erica L; Minnett,Peter J.
Global cloudiness distributions, though an important component in radiative and hydrological budgets, are neither adequately known nor easily retrieved by the spatial and spectral resolutions afforded by current satellite instrumentation. At high latitudes, cold, high albedo surfaces present a particular challenge to cloud retrieval, offering little or no thermal or visible contrast for cloud-ice discrimination. It is in these frequently cloudy and climate-sensitive regions that changing cloud amounts and optical parameters enact the greatest influence, enhancing or suppressing melt through cloud base emission of longwave radiation or scattering of incident shortwave radiation. Polynyas and leads, seasonally ice-free areas characterized by intense air-sea...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200056

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

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

IDENTIFICACION MORFOLOGICA DE LAS ALETAS DE LOS PRINCIPALES TIBURONES PELAGICOS COMERCIALIZADOS EN CHILE: AZULEJO (PRIONACE GLAUCA LINNAEUS), MARRAJO (ISURUS OXYRHINCHUS RAFINESQUE), Y TINTORERA (LAMNA NASUS BONNATERRE)
Provedor de dados: 72
Autores: Hernández,Sebastián; Haye,Pilar A; Acuña,Enzo.
La carencia de registros de desembarque especie-específicos ha producido dificultades en la evaluación de stock de tiburones en Chile. Debido a que los registros son insuficientes para realizar evaluaciones pesqueras, es imperativo contar con características fidedignas para la identificación de las especies o partes de éstas (como las aletas). El presente estudio describe caracteres morfológicos para la identificación de las aletas de las tres especies más importantes de tiburones pelágicos comercializados en Chile (P glauca, I. oxyrhinchusyL. nasus) y provee de claves dicotómicas para la identificación de estas especies usando ya sea la aleta pectoral, la primera dorsal o la caudal. Los resultados revelaron que existen caracteres diagnósticos para...
Tipo: Journal article
Palavras-chave: Clave taxonómica; Caracteres diagnósticos; Corte de aleta; Finning; Patrón de coloración.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100005

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

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

LIPIDOS TOTALES EN LA MUSCULATURA DE PINGUIPES CHILENSIS VALENCIENNES 1833 (PERCIFORMES, PINGUIPEDIDAE)
Provedor de dados: 72
Autores: González,Paola; Oyarzún,Ciro; Becerra,José.
Pinguipes chilensis presenta un comportamiento alimentario y reproductivo que comprende todo el año, en donde índices de condición como Indice Hepatosomático y Factor de Condición no se relacionan con la madurez de las gónadas, indicando una posible independencia de la energía almacenada como lípidos en la musculatura y en el hígado con el proceso reproductivo. El presente trabajo determina el contenido de lípidos totales (%) en la musculatura de P. chilensis, y su variación entre zonas del cuerpo, así como diferencias entre sexos y ontogenéticas. En hembras (n=12) y machos (n=11) capturados en el litoral de Talcahuano, Chile, se determinó el contenido de lípidos totales mediante la Técnica Gravimétrica de extracción por Soxhlet, de tejido muscular desde...
Tipo: Journal article
Palavras-chave: Lípidos; Pinguipes chilensis; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100018

USE OF AMBIENT SOUND MEASUREMENTS IN AN INTEGRATED SYSTEM FOR OCEAN MONITORING
Provedor de dados: 72
Autores: Guymer,Trevor; Quartly,Graham; Birch,Keith.
Measurements of underwater sound were made at 16 frequencies in the range 500 Hz ­ 50 kHz using 3 moored hydrophones located off the west coast of Ireland during Oct-Nov 2003. These data have been analysed in relation to environmental conditions, particularly wind speed and rainfall. Although there are some unexplained offsets in the overall acoustic levels compared with those obtained by other researchers, it has proved possible to develop a classification scheme enabling wind, drizzle, rain, and contamination to be separately identified. The acoustic data can be used to infer wind speed to within 2 m s-1. There is also useful skill in the detection of drizzle and rain events, and some encouraging results in the quantitative estimation of rain-rate have...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200047

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

Los quirópteros de Chile: avances en el conocimiento, aportes para la conservación y proyecciones futuras
Provedor de dados: 72
Autores: SIERRA-CISTERNAS,CRISTINA; RODRÍGUEZ-SERRANO,ENRIQUE.
Los murciélagos representan el segundo orden de mamíferos más diverso. Sudamérica es rica en quirópteros. Sin embargo, Chile tiene una baja diversidad específica (12 especies) y ausencia de endemismos. Las publicaciones científicas que han abordado aspectos de la diversidad y taxonomía de estos mamíferos también son escasas. Esta revisión evaluó el estado actual del conocimiento de los quirópteros en Chile y sus principales resultados. Se distinguió de forma crítica los campos de investigación más y menos fortalecidos. Además se propone una explicación para la baja diversidad. Finalmente se confeccionó un mapa de distribución geográfica de las especies, relacionado con los biomas de Chile. Como resultado se recopilaron un total de 27 referencias en las...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100007

USO DE HABITAT DE CUATRO CARNIVOROS TERRESTRES EN EL SUR DE CHILE
Provedor de dados: 72
Autores: Zúñiga,Alfredo; Muñoz-Pedreros,Andrés; Fierro,Andrés.
El proceso de transformación del paisaje ha sido más intenso y vasto en la depresión intermedia del centro y sur de Chile que en las zonas cordilleranas aledañas. En dicha depresión el bosque nativo original prácticamente ha desaparecido y en el sur de Chile ha permanecido fragmentado e inserto en una matriz de agroecosistemas. Esto puede influir en la distribución de los mamíferos carnívoros, según sean especialistas o generalistas de habitat, así como del tamaño de su ámbito de hogar. En este contexto el objetivo de este estudio fue evaluar, mediante el estudio de la distribución de fecas, la selección de habitat del ensamble de carnívoros en un ambiente fragmentado en el sur de Chile. Documentamos el uso selectivo de Puma concolor, Galictis cuja y...
Tipo: Journal article
Palavras-chave: Carnívoros; Fragmentación; Selección de habitat; Sobreposición espacial.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000200004

SPRATTUS FUEGENSIS EN AGUAS INTERIORES DE CHILOE, CHILE (OSTEICHTHYES: CLUPEIFORMES: CLUPEIDAE)
Provedor de dados: 72
Autores: Aranis R,Antonio; Meléndez C,Roberto; Pequeño R,Germán; Cerna T,Francisco.
Una especie de Clupeiformes que ha sido habitual en las capturas de la flota pesquera artesanal que opera en el mar interior de Chiloé, Chile, ha sido confundida con la sardina común (Strangomera bentincki) y la sardina española (Sardinops sagax musica), cuyas distribuciones geográficas en esta área marcan su límite austral. Mediante un análisis de morfometría y recuentos de estructuras duras de siete ejemplares capturados en julio de 2005 y provenientes del área de pesca de Quicaví, Chiloé (42º17'S-73º22'W), se determinó, que correspondían a seis Sprattus fuegensis (Jenyns 1842) (sardina fueguina), y que ella estaría presente hegemónicamente en las capturas del mar interior de Chiloé; en la X Región administrativa de Chile. Basado en la captura de...
Tipo: Journal article
Palavras-chave: Sardina austral; Taxonomía; Pesquería pelágica.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100011

VALIDATION OF ARGO DATA IN THE INDIAN OCEAN
Provedor de dados: 72
Autores: Thadathil,Pankajakshan; Muraleedharan,P.M.; Gopalakrishna,V.V.; Reddy,G. V.; Ratnakaran,Lasitha; Revichandran,C.; Murthy,V.S.N.
ARGO-salinity data from the Indian Ocean are validated using salinity from float-versus-float match-ups and also using CTD observations from three cruises. Validation data sets are selected in such a way that the float and the match-up data are collocated with tolerable space-time difference. For validation a time difference of less than 10 days and space difference less than 100 Km have been considered. The evaluation is done using salinity data on theta (potential temperature) surfaces from deeper observations. One of the significant observation of float-versus-float validation is the large random error observed in the initial profiles of the float-salinity compared to later profiles. While the float salinity data is found to be largely in good agreement...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300025

Revisión del estado taxonómico de Nyctelia multicristata Blanchard, 1846 y descripción de Nyctelia confusa Zuñiga-Reinoso n. sp. (Coleoptera: Tenebrionidae)
Provedor de dados: 72
Autores: Zúñiga-Reinoso,Álvaro; Jerez,Viviane.
Existe una confusión con la validez taxonómica de Nyctelia multicristata Blanchard en Hombron &amp;amp; Jaquinot (1846). Esto se debe a que Kulzer (1963) en la revisión del género Nyctelia, redescribe a la especie N. multicristata y describe una nueva especie, N. fallax, en base a caracteres morfológicos poco claros y la mayoría compartidos con N. multicristata. El análisis morfológico, reveló que los especimenes adscritos a N. fallax se debe sinonimizar con N. multicristata. Tanto la morfología externa y la genitalia revelan que el morfotipo N. multicristata redescrito por Kulzer, corresponde a una nueva especie.
Tipo: Journal article
Palavras-chave: Nycteliini; Nyctelia fallax; Sinonimia; Nyctelia confusa; Taxonomía.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000200004

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

RECTIFICATION OF THE ENSO VARIABILITY BY INTERDECADAL CHANGES IN THE EQUATORIAL BACKGROUND MEAN STATE IN A CGCM SIMULATION
Provedor de dados: 72
Autores: Dewitte,Boris; Yeh,Sang-Wook; Cibot,Carole; Terray,Laurent.
A 200-yr long coupled general circulation model (CGCM) simulation is used to investigate the characteristics and impact of the low frequency variability of the equatorial background stratification on the ENSO modulation. A vertical mode decomposition of the model mean vertical structure is performed and the interdecadal variability of the baroclinic mode parameters is analyzed. The low frequency variations of the baroclinic mode parameters associated to the decadal mode in the model are then used to force an intermediate coupled anomaly model "tuned" with the CGCM derived climatologies and wave parameters. Results of sensitivity experiments indicate that a rectification of the interannual variability (ENSO timescales) by the interdecadal variability...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200028

Genetic variability in jack mackerel Trachurus murphyi Nichols: New SSRs loci and application
Provedor de dados: 72
Autores: Galleguillos,Ricardo; Canales-Aguirre,Cristian B; Ferrada,Sandra.
Nine novel microsatellite loci were developed for Trachurus murphyi. These loci were characterized in samples from three sites along the eastern South Pacific Ocean. One of the loci was monomorphic, whereas the rest of the loci had between six and 19 alleles per locus and showed the expected heterozygosity ranging from 0.653 to 0.933. These loci do not show genetic differentiation among the analyzed sites.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000200009

PARAMETRIZACION AMBIENTAL EN MODELOS BIOLOGICO-PESQUEROS: UNA REVISION
Provedor de dados: 72
Autores: Wiff,Rodrigo; Quiñones,Renato A.
Se revisa la incorporación de la variabilidad ambiental en los modelos biológico-pesqueros comúnmente utilizados en evaluación de stock, desde un punto de vista biológico y cuantitativo. Este artículo está enfocado principalmente a la parametrización del ambiente físico y químico del hábitat. Los principales modelos biológico-pesqueros analizados dicen relación con: crecimiento individual, producción, reclutamiento y estandarización de la captura por unidad de esfuerzo. Existen tres principales enfoques que se han utilizado para la parametrización del ambiente en el contexto de los modelos biológico-pesqueros: (i) modelación teórico-mecanicista del ambiente, (ii) modelación estocástica de connotación ambiental, y (iii) modelación a través de series de...
Tipo: Journal article
Palavras-chave: Parámetro ambiental; Modelos pesqueros; Evaluación de Stock; Oceanografía pesquera; Parametrización.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100008

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

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

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

S-CHLOROPHYLL SQUIRTS IN THE CHILEAN COAST: A SEAWIFS PERSPECTIVE
Provedor de dados: 72
Autores: Marín,Víctor H.; Delgado,Luisa E.
Squirts can be defined as one-way jets, transporting coastally upwelled water to the deep ocean and terminating in a counterrotating vortex pair. These mesoscale oceanographic structures can export coastal biological production up to 200 km offshore. We describe, based on the analysis of SeaWIFS images, a squirt located in the northern Chilean coast (30° S). Our results show that the spatial structure of the velocity field, and the hammerhead shape, agree with previous conceptual models. We used the circulation data, resulting from feature-tracking analysis, to estimate the offshore export of coastal carbon production. We conclude that squirts represent a net carbon exporting mechanism accounting for 5% to 12% of coastal carbon production
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300012

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

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

SIMULTANEOUS RETRIEVAL OF AEROSOLS AND MARINE CONSTITUENTS IN COASTAL WATERS
Provedor de dados: 72
Autores: Stamnes,K.; Eide,H.; Li,W.; Spurr,R.; Stamnes,J. J.
A new method for simultaneous retrieval of aerosol properties and marine constituents in turbid waters is described. This method is an extension to turbid waters of an approach developed previously for simultaneous retrieval of aerosol properties and chlorophyll concentrations in clear waters. This extension is accomplished by employing near-infrared (NIR) channels not available on the SeaWiFS and MERIS instruments to help retrieve aerosol parameters over turbid waters. Optimal estimation theory is used to retrieve in-water parameters from multi- and hyperspectral information. Both forward and inverse modeling strategies will be discussed, as well as the uniqueness of the solutions, the information content available in multi- and hyperspectral data, and...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300041

"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

SPATIAL AND TEMPORAL VARIABILITY OF THERMAL FRONTS OFF CENTRAL CHILE (33-40S)
Provedor de dados: 72
Autores: Letelier,J.; Pizarro,O.; Núñez,S.; Arcos,D.
During the upwelling season along the coast off central Chile (33-40S), cold upwelled water can be easily distinguished from warm oceanic water using satellite infrared images. The boundary between cold and warm surface waters is a relatively narrow region with large horizontal gradients, denominated upwelling front, which is also clearly visible in satellite images. Here, using daily NOAA satellite infrared images from the period 1998-2000, we described the spatial distribution of mesoscale features related to upwelling fronts. Together with infrared data, we use SeaWiFS's color images to explore the relationship between Chlorophyll concentration and thermal upwelling fronts. Our results show that thermal fronts have maximum intensities (0.2C/km) in...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300008

THE SCATTEROMETER AS A PRESSURE SENSOR
Provedor de dados: 72
Autores: Brown,Robert A; Patoux,Jerome.
The UW Planetary Boundary Layer (PBL) model is used to derive surface pressure fields from scatterometer surface measurements. After a decade of comparison with NMC wind products, it is clear that the combination of the scatterometer and the PBL model yield superior information about the global pressure fields. The pressure fields are used to correct the scatterometer winds where they are contaminated by rain or poorly retrieved due to antenna geometry. The new winds are compared to buoy wind measurements. The scatterometer-derived surface pressure fields are assessed with buoy measurements and NWS analyses (NCEP, ECMWF and MM5 in the Gulf of Alaska). The gradients are systematically compared to buoy-measured pressure gradients. The model has been used to...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200011

Natural history of the Chinchilla genus (Bennett 1829): Considerations of their ecology, taxonomy and conservation status
Provedor de dados: 72
Autores: VALLADARES FAÚNDEZ,PABLO; SPOTORNO OYARZÚN,ÁNGEL; ZULETA RAMOS,CARLOS.
Over the last years there has been new and valuable information in both wild chinchillas, however this is still insufficient for effective protection. In this paper we review some fundamental aspects of its natural history, synthesizing and delivering new information about their ecology, taxonomy and conservation status, based on the review of available literature, and field data collection. In relation to their ecology we have been identified new colonies of both species, for scientific research as well as environmental technical reports. For most of these colonies we identified vegetation to which they are associated, predators and other sympatric rodent species. The taxonomy of these species is controversial. A proposal was submitted to ICZN in 2003,...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200008

HYPERSPECTRAL IMAGING AND GIS: TOWARDS AN OPERATIONAL APPROACH TO MAP SHALLOW, MARINE, INVASIVE ALGAL SPECIES IN OPTICALLY DENSE WATERS
Provedor de dados: 72
Autores: Gagnon,Patrick; Jones,William; Ripley,Herbert T; Scheibling,Robert E; Hatcher,Bruce G.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200038

RADIOLARIOS POLYCYSTINA (PROTOZOA: NASSELLARIA Y SPUMELLARIA) SEDIMENTADOS EN LA ZONA CENTRO-SUR DE CHILE (36°- 43° S)
Provedor de dados: 72
Autores: Vergara S,Odette; Marchant S. M,Margarita; Giglio,Susana.
Los radiolarios son protozoos planctónicos marinos, los cuales, a pesar de ser sólo una célula, son sofisticados y complejos organismos. La Subclase Radiolaria está formada por 2 superórdenes: Trypilea y Polycystina, siendo el último el más estudiado, pues su esqueleto de opal es más resistente a la disolución en agua de mar y por ende, más comúnmente preservados en el registro fósil. Los radiolarios han sido usados como una útil herramienta oceanográfica, bioestratigráfica y paleoambiental, gracias a su esqueleto de sílice y a su gran rango geológico. En nuestro país el conocimiento de este grupo es muy escaso, es por esto que el presente trabajo, tiene como principal objetivo, aportar con la identificación y descripción de especies de radiolarios...
Tipo: Journal article
Palavras-chave: Radiolarios; Polycystina; Nassellaria y Spumellaria; Recientes; Opal; Pacífico sureste; Chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100010

Transformación de Roxarsona por un consorcio bacteriano aislado desde suelo en condiciones Aeróbicas
Provedor de dados: 72
Autores: GUZMÁN-FIERRO,VÍCTOR; PEDRAZA,MARCELA; LEÓN,CARLA; CAMPOS,VÍCTOR L; MONDACA,MARÍA-ANGÉLICA.
Roxarsone (ROX) es un compuesto organoarsenical utilizado como aditivo alimentario en la industria avicola y tiene el riesgo potencial de contaminar el ambiente, debido al uso de estiércol de aves de corral como fertilizante. El objetivo del presente trabajo fue aislar y caracterizar un consorcio bacteriano, proveniente de un suelo agricola, capaz de degradar ROX bajo condiciones aeróbicas. Muestras de suelos colectadas en las cercanías de una industria avícola (Octava región, CHILE) fueron enriquecidas en caldo R2A 9,1% (p/v). El consorcio bacteriano seleccionado fue crecido a 25°C con agitación constante (125 rpm) en ausencia y presencia de ROX (0,5 mM) y en condiciones de aerobiosis. El consorcio fue caracterizado molecularmente por DGGE acoplado a un...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000100001

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

Reach scale ecologic influence of in-stream large wood in a Coastal Mountain range channel, Southern Chile
Provedor de dados: 72
Autores: VERA,MACARENA; JARA,CARLOS; IROUMÉ,ANDRÉS; ULLOA,HÉCTOR; ANDREOLI,ANDREA; BARRIENTOS,SEBASTIÁN.
The ecologic influence of in-stream large wood (LW) was evaluated at reach scale in a third-order channel located in the Coastal Mountain Range, southern Chile. The tested hypotheses were that Coarse Particle Organic Matter (CPOM) retention is higher and benthic macro-invertebrates are more diverse in channel reaches storing higher volumes of LW. Three LW-low-volume reaches (mean LW volume of 8 m³ 100m-1 of reach channel length; plane bed morphology) and three LW-high-volume reaches (mean volume 262 m³ 100m-1; forced pool riffle bed morphology) were selected within a 1557 m-long segment of the study channel. CPOM retention was inferred from the difference between the number of leaves collected in the downstream end of each reach and the leaves introduced...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200002

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

INVERSION OF GEOACOUSTIC MODEL PARAMETERS USING SHIP NOISE
Provedor de dados: 72
Autores: Ross Chapman,N; Dizaji,Reza M; Lynn Kirlin,R.
Estimation of geoacoustic models of the sea bed is an underlying research issue in understanding acoustic propagation in shallow water environments where the propagation is generally bottom limited. Inversion methods based on matched field processing have become widely used in applications with experimental data at various sites worldwide. Traditionally, the experiments have been carried out with controlled source geometries. This paper presents a new experimental approach that makes use of the noise radiated by passing ships as the sound source for the inversion. Ship noise data were measured on a 16-element vertical line array in shallow water off the west coast of Vancouver Island. The data were filtered into low (70-110 Hz) and high (170-290 Hz)...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200020

Marine biodiversity in Brazil: Estado actual del conocimiento
Provedor de dados: 72
Autores: G. Couto,Erminda C; Da Silveira,Fábio Lang; A. Rocha,Gecely R.
Brazil has one of the highest biodiversities in the world, both in the terrestrial and the marine environment. Thanks to its extensive coastal line, Brazilian marine flora and fauna are composed of species from many different marine bioregions. The ecosystems on the south-eastern and southern coasts have received considerable attention but, due to the great impact of human activities such as tourism, over-exploitation of marine resources, physical alteration, oil related activities and pollution among others, this environment is under great risk and its biodiversity is threatened. The most representative ecosystems of this region include sandy beaches, rocky shores, sea grass beds, soft bottom communities and mangrove forests. On the northern coast where...
Tipo: Journal article
Palavras-chave: Brazil; Tropical; Marine biodiversity; Conservation.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200014

HERMETISMO ENTRE Solenopsis gayi SPINOLA, 1851 Y Brachymyrmex giardii EMERY, 1894 (HYMENOPTERA,FORMICIDAE)
Provedor de dados: 72
Autores: Ipinza-Regla,Joaquín; Fernández,A.; Morales,M.A.
Al fin de analizar la presencia de hermetismo entre dos especies de hormigas, se trabajó con cinco grupos de : Solenopsis gayi y cinco grupos de hormigas Brachymyrmex giardii. Diez hormigas por nido desde nidos de Solenopsis gayi fueron transferidas a nidos de hormigas Brachymyrmex giardii (residentes) y diez hormigas por nido de B. giardii fueron transferidas,en igual forma, a nidos de hormigas S. gayi (residentes) . Se observó, durante dos minutos, la presencia o ausencia de los siguientes eventos conductuales:exploración antenal (EA), abertura mandibular(AM), mordedura (MO), flexión ventral de abdomen (FVA), flexión dorsal de abdomen (FDA), lucha (L), transporte de la intrusa (TI) y retroceso (R) Después de la observación de cada evento. se calculó el...
Tipo: Journal article
Palavras-chave: Solenopsis gayi; Brachymyrmex giardii; Comportamientos de rechazo y de reconocimiento; Hermetismo.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100005

NUEVOS PIOJOS (PHTHIRAPTERA: AMBLYCERA, ISCHNOCERA) REGISTRADOS EN AVES MARINAS Y COSTERAS DE URUGUAY
Provedor de dados: 72
Autores: Venzal,José M; Castro,Oscar; Katz,Helena; Félix,María L; Morgades,Diana; Palma,Ricardo L.
In this study, 17 lice species were collected and identified from marine and coastal birds from the Atlantic Ocean coast, rivers and lagoons of Uruguay. Among them, 16 species (one at generic level only) are recorded for the first time for this country.
Tipo: Journal article
Palavras-chave: Phthiraptera; Amblycera; Ischnocera; Lice; Marine and coastal birds; Uruguay.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200008

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

VALIDATION OF AMSR-E ICE CONCENTRATION &amp;amp; THICKNESS IN THE OKHOTSK SEA
Provedor de dados: 72
Autores: Nishio,Fumihiko; Comiso,Josefino C.; Nakayama,Masashige; Gasiewski,Al.
The data from aircraft and ship campaigns in February 2003 in conjunction with high resolution satellite images for validating sea ice concentrations and thickness derived from AMSR-E brightness temperatures are presented. Patrol Vessel "SOYA" conducted time series observations of sea ice parameters such as ice type, floe size, snow thickness, density, grain size on sea ice and ice surface temperature, and salinity. Surface data by ship were used to interpret aircraft microwave (PSR) and visible channel data obtained by the high resolution Landsat-7 and MODIS images. The latter data were utilized to interpret the ice concentration derived from AMSR-E. The co-registered images of aircraft PSR, Landsat-7 and MODIS data exhibit good coherence in signatures....
Tipo: Journal article
Palavras-chave: AMSR passive microwave radiometer concentration; Brightness temperature sea ice thickness.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300022

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

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

USING SATELLITE TECHNOLOGY IMPROVE CHILEAN PURSEINE FISHING FLEET
Provedor de dados: 72
Autores: Yáñez,E.; Silva,C.; Nieto,K.; Barbieri,M.A.; Martínez,G.
A work of gathering historical fishing (catch, fishing effort, CPUE, characteristics and operation of purseiner fleet) and satellite (NOAA, SeaStar and SeaWind) database of northern Chile, and fishing and oceanographic in situ sampling for validation purpose is made. With this information and the use of geographical information system (GIS) the distribution of pelagic resources and the associated environmental conditions (sea surface temperature, thermal gradients, chlorophyll concentration and wind fields) are analysed in order to develop a probable fishing ground (PFG) index prediction model. A PFG model of anchovy (Engraulins ringens) is operative for the northern Chile. The impact of the use of PFG charts was evaluated analyzing the operational...
Tipo: Journal article
Palavras-chave: Pelagic fisheries; Northern Chile; Remote sensing; GIS; PFG index and model.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300048

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

PRIMER REGISTRO DE NESSORHAMPHUS INGOLFIANUS (SCHMIDT, 1912) EN AGUAS CHILENAS (ANGUILLIFORMES: DERICHTHYIDAE)
Provedor de dados: 72
Autores: Hüne,Mathias; Reyes,Pablo; Ruiz,Victor H.
The finding of three specimens of Nessorhamphus ingolfianus (Schmidt 1912), obtained in front of Valdivia (39º 44'S; 70º 39'W) is reported. This proves to be the first record of this species for the Southeastern Pacific and for the Chilean ichthyofauna.
Tipo: Journal article
Palavras-chave: Derichthyidae; Nessorhamphus; Chile.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200012

MOLUSCOS DEL INTERMAREAL ROCOSO DEL CENTRO-SUR DE CHILE (36° - 38°S): TAXONOMIA Y CLAVE DE IDENTIFICACION
Provedor de dados: 72
Autores: Aldea,Cristián; Valdovinos,Claudio.
Estudios de la biodiversidad existente en la zona intermareal rocosa del centro-sur de Chile, tanto de carácter local como regional, todavía son limitados. Debido a ello, no permiten el reconocimiento de patrones de diversidad a lo largo de la costa con una gran resolución espacial, lo cual es información básica al momento de priorizar áreas para la conservación de la biodiversidad. En este sentido, el objetivo de la presente contribución es estudiar la malacofauna de la zona intermareal rocosa del centro-sur de Chile, en un tramo de 250 km de costa, comprendida entre Punta Pingueral (36° 31'S) y Cabo Tirúa (38° 25'S). Se estudiaron los moluscos de 23 sitios de muestreo, incluyendo las islas Santa María y Mocha. En cada sitio se caracterizó el hábitat...
Tipo: Journal article
Palavras-chave: Biodiversidad; Moluscos; Taxonomía; Intermareal; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200014

FINDING OF GORDIUS AUSTRINUS DE VILLALOBOS, ZANCA &amp;amp; IBARRA - VIDAL, 2005 (GORDIIDA, NEMATOMORPHA) IN THE STOMACH OF SALMO TRUTTA (SALMONIFORMES) IN PATAGONIA
Provedor de dados: 72
Autores: de Villalobos,Cristina; Ortiz-Sandoval,Juan J; Habit,Evelyn.
Field observations revealed, for the first time, cases of predation on Gordius austrinus by Salmo trutta in Risopatrón Lake, Aysén Region, Chile. Reinvestigation by SEM of the characteristics of the posterior end and of the cuticle of the specimens of horsehair worms collected inside the stomach of brown trout allow us to assign the specimens to the species Gordius austrinus. Also we could show that in some specimens the cuticle of mid body and terminal end presented structural alterations, due to the action of the digestive juices of the fish. This finding implies the extension of the distribution range of G. austrinus.
Tipo: Journal article
Palavras-chave: Nematomorpha; Gordius austrinus; Predation; Salmo trutta; Patagonian Lakes.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100005

Eye orbit geometric shape in Liolaemus as an indicator of polygyny or monogamy
Provedor de dados: 72
Autores: Vidal Maldonado,Marcela. A.
Most animal groups have sexual dimorphism in morphological characters, especially body size. In many cases, sexual dimorphism may be a consequence of a hierarchical social organization within populations. However, polygyny or monogamy may evolve independently of sexual dimorphism. Two Liolaemus species are known to be good model species to study the relationship between sexual dimorphism and sexual social system: Liolaemus tenuis (polygyny) and Liolaemus copiapoensis (monogamy). In this study, I evaluate the morphological variation in the geometric shape of the orbit between sexes in the two species, comparing their social condition (polygyny, monogamy) and applying a geometric morphometrical methodology. The results show morphological differentiation in...
Tipo: Journal article
Palavras-chave: Geometric morphometrics; Liolaemus copiapoensis; Liolaemus tenuis; Social behavior.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200004

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

Experiencias y resultados de investigaciones sobre el camarón de río del norte CRYPHIOPS CAEMENTARIUS (MOLINA 1782) (DECAPODA: PALAEMONIDAE): HISTORIA NATURAL Y CULTIVO
Provedor de dados: 72
Autores: Meruane,Jaime A; Morales,María C; Galleguillos,César A; Rivera,Miguel A; Hosokawa,Hidetsuyo.
Cryphiops caementarius (Molina 1782) (Decapoda: Palaemonidae), denominado camarón de río del norte (Fig. 1), es la única especie de la familia representada en Chile y su distribución geográfica está restringida a los ríos de la costa occidental de Perú y Chile desde los 10ºS hasta los 32º 55´S. En Chile, esta especie habita principalmente los ríos y quebradas que drenan las aguas de los contrafuertes cordilleranos y estuvo protegida durante un largo tiempo por una veda total. Sin embargo, la explotación clandestina con extracción desmedida se mantuvo por años, llevando a la reducción del tamaño de las poblaciones de este decápodo y a la disminución de la talla de los ejemplares extraídos. El deterioro de este recurso renovable motivó a la autoridad a...
Tipo: Journal article
Palavras-chave: Cryphiops caementarius; Camarón de río; Biología; Ecología; Larvas; Cultivo.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200015

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

NEW RECORDS OF HATCHERIA MACRAEI (SILURIFORMES, TRICHOMYCTERIDAE) FROM CHILEAN PROVINCE
Provedor de dados: 72
Autores: Unmack,Peter J; Habit,Evelyn M; Johnson,Jerald B.
We describe collections oiHatcheria macraei (Patagonian catfish) from south-central Chile. This represents a significant range extension for this species. These new records have important biogeographic implications as H. macraei is now recorded within Chilean Province, far north of its previous distributional limit in Patagonian Province. We document a new character, the shape of the dorsal fin, which allows quick and easy discrimination between H. macraei and Trichomycterus areolatus in the field or laboratory. This study highlights the need for careful identification for trichomycterid catfishes from southern Chile.
Tipo: Journal article
Palavras-chave: Trichomycteridae; Hatcheria macraei; Trichomycterus areolatus; Morphology; Meristics.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100013

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

SOBRE LA BIOLOGIA DEL CAMARON DE RIO SAMASTACUS SPINIFRONS (PHILIPPI 1882) (DECAPODA, PARASTACIDAE)
Provedor de dados: 72
Autores: Rudolph,Erich H.
Se ha revisado la bibliografía que existe sobre Samastacus spinifrons junto a otros datos accesibles al autor, con el objetivo de actualizar el conocimiento biológico de la especie. Se analiza y se entrega información sobre: sistemática, distribución geográfica, hábitat, características fisicoquímicas del agua, variación morfológica, tamaño, relación talla-peso, biología reproductiva, estructura demográfica, migraciones, hábitos alimentarios, predadores, epibiontes, enfermedades, métodos de captura, comportamiento en cautiverio, calidad de la carne, comercialización, legislación, estado de conservación, perspectivas de cultivo comercial, junto a otros aspectos aún no conocidos de la biología de la especie
Tipo: Journal article
Palavras-chave: Camarón de río; Samastacus spinifrons; Biología de Parastacidae; Crustáceos decápodos de Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200009

NUEVO HALLAZGO DEL PEZ ESCORPION PONTINUS SIERRA (Gilbert 1890) (PISCES: OSTEICHTHYES: SCORPAENIDAE) EN AGUAS DEL OCEANO PACIFICO COLOMBIANO
Provedor de dados: 72
Autores: Pedraza,Milton J.; Rubio,Efraín A.; Zapata,Luis A.
RESUMEN En el presente trabajo se registra la captura de dos ejemplares adultos de Pontinus sierra (Gilbert 1890) en aguas del Océano Pacífico de Colombia, mediante la utilización de trampas y como fauna acompañante de la pesquería del camarón de profundidad
Tipo: Journal article
Palavras-chave: Nuevo registro; Pontinus sierra; Pacífico colombiano.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100009

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

SURFACE FEATURES OF THE CIRCULATION IN FJORDS OF SOUTHERN CHILE OBSERVED IN ERS AND LANDSAT IMAGES
Provedor de dados: 72
Autores: Cáceres,Mario.
Surface features of the hydrodynamics at the mouth of Aysen Fjord, in the Chilean Inland Sea, were described using Landsat and ERS-SAR images in combination with field data. A set of seventeen radar images from ERS, along with one Landsat (ETM) were analyzed to study the surface features observed in this region, where fresh water input is an important contributor to the dynamics of the estuarine system. Field data were provided by current measurements obtained with an Acoustic Doppler Current Profiler (ADCP) mounted in a catamaran looking downward, which was towed from a boat during two semidiurnal cycles to obtain repetitions over two transverse transects. There were also density measurements obtained from CTD (Conductivity, Temperature and Depth)...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200014

NUEVA ESPECIE DE LEPIDOPTERO NOCTURNO A 250 ANOS DEL SYSTEMA NATURAE
Provedor de dados: 72
Autores: Ángulo,Andrés O; 0livares,Tania S.
Se describe e ilustran los adultos y genitalia de macho y hembra de. Albirenia nilssoni n. sp. que se distribuye entre la VII y la X Región de Chile. El material examinado proviene de las Colecciones Científicas de la Universidad de Concepción. La nueva especie se caracteriza externamente por presentar una banda subasal muy notoria, orbicular oval e inclinada, genitalia del macho con presencia de una ampulla única y un aedeagus armado con 15 espinas. Esta especie se diferencia de A. preandina (Koehler) por el largo y forma de la ampulla, el cornuti y una proyección aguda de la costa ventral de la valva.
Tipo: Journal article
Palavras-chave: Albirenia nilssoni n. sp; Genitalia del macho y hembra; Cuculliinae.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200004

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

Estado de conocimiento de los Gastrópodos dulceacuícolas de Chile
Provedor de dados: 72
Autores: Valdovinos Zarges,Claudio.
De acuerdo a la literatura, los gastrópodos dulceacuícolas chilenos están compuestos por 73 especies, i.e., 30 spp. de Chilinidae (género Chilina Gray 1828), 4 spp. de Physidae (género Physa Draparnaud 1801), 5 spp. de Lymnaeidae (género Lymnaea Lamarck 1799), 7 spp. de Planorbidae (género Biomphalaria Preston 1910), 5 spp. de Ancylidae (género Anisancylus Pilsbry 1924 y Uncancylus Pilsbry 1913), y 22 spp. de Hydrobiidae (género Potamolithus Pilsbry 1896 y Littoridina Souleyet 1852). La distribución del conjunto de especies de gastrópodos se extiende desde Arica en el norte hasta Magallanes en el sur. Sin embargo, la mayor parte de las especies tiene su rango geográfico restringido a una o unas pocas cuencas hidrográficas contiguas a lo largo del gradiente...
Tipo: Journal article
Palavras-chave: Gastrópodos dulceacuícolas; Biodiversidad; Chile; Taxonomía; Biogeografía; Conservación.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100014

LA RELOCALIZACION COMO UNA HERRAMIENTA DE CONSERVACION Y MANEJO DE LA BIODIVERSIDAD: LECCIONES APRENDIDAS CON DIPLODON CHILENSIS (GRAY 1828) (BIVALVIA, HYRIIDAE)
Provedor de dados: 72
Autores: Parada,Esperanza; Peredo,Santiago.
Entregamos las lecciones aprendidas de un proyecto de relocalización de largo plazo llevado a cabo con el hírido Diplodon chilensis. El documento analiza las causas de la declinación de las poblaciones en Chile y el uso de la relocalización como una herramienta de conservación y manejo de la biodiversidad acuática. Las lecciones aprendidas analizan las consideraciones que deben cautelarse antes, durante y después de llevado a cabo el proceso de relocalización y las implicancias ecológicas, sanitarias y evolutivas de los programas de relocalización. Concluimos que la relocalización es una herramienta adecuada para la conservación y manejo de las poblaciones de almejas de agua dulce y que se puede llevar a cabo exitosamente tomando las consideraciones antes...
Tipo: Journal article
Palavras-chave: Relocalización; Almejas de agua dulce; Conservación; Manejo; Biodiversidad.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100007

ESTANDARIZACION DEL BIOENSAYO DE TOXICIDAD AGUAD CON DIPLODON CHILENSIS USANDO UN TOXICO DE REFERENCIA
Provedor de dados: 72
Autores: Silva,Jeannette; Fuentealba,Carmen; Bay-Schmith,Enrique; Larrain,Alberto.
El amplio rango de sensibilidades de las diferentes especies de organismos a la extensa diversidad de contaminantes ambientales hacen recomendable utilizar una batería de especies distintas en las evaluaciones de toxicidad ambiental. Los bioensayos con cada una de esas especies son estandarizados para minimizar las variaciones en mediciones sucesivas. El bivalvo dulceacuícola Diplodon chilensis es un potencial organismo experimental para bioensayos de toxicidad en base a sus poblaciones abundantes y de amplia distribución en ríos y lagos de Chile y por su trascendencia ecológica para las comunidades planctónicas por ser un poderoso filtrador. Se describe un procedimiento de bioensayo estandarizado con D. chilensis seguido de la calibración del método....
Tipo: Journal article
Palavras-chave: Bivalvos dulceacuícolas; Calibración; Coeficiente de variación; Dicromato de potasio.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200001

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

GENOMIC INTEGRITY EVALUATION IN SPERM OF CHOROMYTILUS CHORUS (MOLINA, 1782) BY COMET ASSAY
Provedor de dados: 72
Autores: Lafarga-De la Cruz,Fabiola; Valenzuela-Bustamante,Myriam; Dupré,Enrique; del Río-Portilla,Miguel A; Gallardo-Escárate,Cristián.
The comet assays or single cell gel electrophoresis is a simple, rapid, relatively inexpensive and very sensitive method that has been recently widely used to evaluate genomic integrity (or DNA damage) in aquatic animals exposed to diverse physical and chemical agents. However, the accuracy to evaluate comets assay has been the major obstacle in order to determine specific damage undergone cellular stress. The aim of this study was to evaluate DNA fragmentation in sperm cells based in fluorescence image analysis. The species used was the giant mussel Choromytilus chorus. The in vitro experiments were carried out through oxidative stress with five hydrogen peroxide concentrations (0, 50, 100, 500 and 1000 mM). To evaluate DNA damage two groups of parameters...
Tipo: Journal article
Palavras-chave: Single cell gel electrophoresis; DNA damage; Image analysis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100006

FIRST SOUTH AMERICAN RECORDS OF HOLOCNEMUS PLUCHEI (SCOPOLI, 1763) AND SPERMOPHORA SENOCULATA (DUGÉS, 1836) (ARANEAE: PHOLCIDAE)
Provedor de dados: 72
Autores: Laborda,Alvaro; Simó,Miguel.
Holocnemus pluchei y Spermophora senoculata fueron halladas en construcciones humanas en cuatro localidades de Uruguay y una de Argentina. Estos son los primeros registros para Sudamérica de estas dos especies sinantrópicas.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200013

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

MORFOMETRIA Y MERISTICA DE APLODACTYLUS PUNCTATUS VALENCIENNES 1832 (PISCES: APLODACTYLIDAE) PROVENIENTES DE LA ZONA ENTRE IQUIQUE (20° 13'S) Y CONCEPCION (36° 47' S), CHILE
Provedor de dados: 72
Autores: Meléndez C.,Roberto.
El género Aplodactylus en Chile incluye cinco especies nominales. Recientes estudios señalan la presencia de Aplodactylus punctatus (jerguilla) solamente. Sin embargo, existen al menos tres variaciones cromáticas de esta especie, verdosa (más común), amarillenta y blanquecina (más escasas). Se realizó un estudio morfométrico y merístico de A. punctatus, incluyendo las variaciones de color, provenientes del litoral centro-norte de Chile (ca 20&amp;deg;-37&amp;deg;S), utilizando estadísticos univariados (t-student) y Análisis de Componentes Principales. No se detectó diferencias en los ejemplares estudiados tanto en su morfometría, merística y coloración a lo largo del área estudiada. Se corrobora la existencia de Aplodactylus punctactus como única...
Tipo: Journal article
Palavras-chave: Aplodactylus punctatus; Pacífico Sur-oriental; Variación cromática; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200016

GEOMETRIDOS (LEPIDOPTERA) PRESENTES EN FORMACIONES VEGETALES DE LA RESERVA NACIONAL ISLA MOCHA (VIII REGION CHILE)
Provedor de dados: 72
Autores: Mundaca,Enrique A.; Parra,Luis E.
Se entrega el primer registro de especies de Geometridae recolectados en la Reserva Nacional Isla Mocha (VIII Región, Chile) durante dos muestreos realizados entre los meses de septiembre y diciembre de 1998. Se establecieron 5 y 4 puntos muestreales respectivamente, ubicados en diferentes formaciones vegetales presentes en la isla. Los Geometridae fueron colectados usando trampa fototrópica. Se obtuvo un total de 141 imagos de Geometridae, pertenecientes a 12 especies, 3 de las cuales son desconocidas para la ciencia. Se discute la importancia del conocimiento de la entomofauna, presencia de las especies recolectadas y la posible relación de éstas con la vegetación de la isla. Se amplía la distribución de todas las especies identificadas hasta Isla Mocha
Tipo: Journal article
Palavras-chave: Geometridae; Distribución geográfica; Biodiversidad; Isla Mocha; Chile.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100001

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

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

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

NUEVOS REGISTROS DE DISTRIBUCION Y NOTAS BIOLOGICAS DE CYDIA LARGO HEPPNER (LEPIDOPTERA: TORTRICIDAE)
Provedor de dados: 72
Autores: Vargas,Héctor A; Parra,Luis E.
Two new distributional records for Cydia largo Heppner, in Azapa and Chaca valleys, northern Chile, are reported. Some observations about of the biology of C. largo are presented.
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200016

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

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

The Perú-Chile undercurrent and the oxigen minimum zone variability off central Chile
Provedor de dados: 72
Autores: Hormazábal,Samuel; Shaffer,Gary; Silva,Nelson; Navarro,Eduardo.
Ten years of continuous current meter recordings near the core of the Peru-Chile Undercurrent (PCU) over the continental slope at 30°S off Chile, local and equatorial wind stress data, and monthly oceanographic sections off Valparaíso (33°S) are used to study the variability of the PCU and the Oxygen Minimum Zone (OMZ) off Chile. The physics that governs the PCU variability differs for intraseasonal periods and for longer periods: Coastal trapped waves dominate the intraseasonal band whereas Rossby waves dominate for periods greater than about 120 days. Semiannual and annual period fluctuations can largely be explained by Rossby waves forced by equatorial Kelvin waves and local winds. Seasonal variations in the PCU are strongly modulated over El Niño/La...
Tipo: Journal article
Palavras-chave: Rossby waves; Oxygen minimum zone; El Niño/La Niña cycles; Peru-Chile Undercurrent.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300009

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

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

Taxonomic identity of the forms of Orestias agassii (Teleostei: Cyprinodontidae) from Chile: A morphological comparison with the syntypes of the species of Peru and Bolivia
Provedor de dados: 72
Autores: CRUZ-JOFRÉ,FRANCO; MORALES,PAMELA; ESQUER-GARRIGOS,YARELI; VILA,IRMA; HUGUENY,BERNARD; GAUBERT,PHILIPPE; MÉNDEZ,MARCO A.
A morphological comparison of two populations assigned to Orestias agassii from the Chilean Altiplano with the syntypes from Peru and Bolivia was performed. The results suggest that populations of Chile do not match the form of Peru (Titicaca- lake), nevertheless the Isluga population could be related to O. agassii of Bolivia.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000100006

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

Variación temporal en la abundancia y diversidad de aves en el humedal del Río Itata, región del Bío-Bío, Chile
Provedor de dados: 72
Autores: González,Angélica L; Vukasovic,M. Angélica; Estades,Cristian F.
Los humedales costeros cumplen una importante función como hábitats para aves acuáticas tanto residentes como visitantes. A pesar de su alta riqueza de especies, en Chile existe una carencia de estudios sobre la estructura y dinámica de los ensambles de aves en estos humedales. Para investigar la importancia como hábitat de aves acuáticas del humedal del río Itata: localizado en la zona centro-sur de Chile: se realizaron censos estacionales por un período de cinco años entre los años 2006 al 2010. Se evaluó el patrón temporal en la diversidad de aves acuáticas de este humedal y se utilizó el análisis indicador de especies (IndVal) para identificar las especies de aves que cumplen un rol de bioindicadoras en la estructura temporal de la comunidad de aves de...
Tipo: Journal article
Palavras-chave: Análisis de especies indicadoras; Aves migratorias; Aves costeras; Humedal.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200006

TECHNIQUE ESTIMATING SEA SPRAY PRODUCTION RATE FOR GLOBAL CLIMATE MODELS FROM SATELLITE-DERIVED MEASURES OF OCEANIC WHITECAP COVERAGE
Provedor de dados: 72
Autores: Monahan,Edward C.
By combining laboratory-determined values for the number of sea spray droplets, per increment of droplet radius, that are produced during the decay of an oceanic whitecap of initial unit surface area, and values determined from both laboratory experiments and field observations for the e-folding time associated with the decay of individual oceanic whitecaps, with satellite-derived measures of the fraction of the sea surface covered at any instant by spilling wave crests (Stage A whitecaps), the number of sea spray droplets, per droplet radius increment, that are produced per unit time, per unit area of the ocean surface, can be estimated. This sea spray aerosol source function can be incorporated in any global climate model where the role of spray droplets...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300016

Southernmost limit of the Vicugna vicugna Molina (Mammalia: Camelidae) in Chile: a review of old records and new field data
Provedor de dados: 72
Autores: VILINA,YERKO A; CRUZ-JOFRÉ,FRANCO; SABAJ,VALERIA.
Vicugna vicugna Molina is a mammal of relatively large size and conspicuous habits; nevertheless, its southernmost distribution limit in Chile is not well established. Many authors were fixed this limit at 27º30´S, we deliver field information of a distribution limit 140 km further south to the recently proposed.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200010

THE INTERNATIONAL VLBI SERVICE, AN EXAMPLE OF INTERAGENCY SUPPORT FOR GEOREFERENTIATION
Provedor de dados: 72
Autores: Ma,Chopo.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300009

HABITOS ALIMENTARIOS DE PLEURODEMA THAUL (ANURA, LEPTODACTYLIDAE), EN CONCEPCION, CHILE
Provedor de dados: 72
Autores: Díaz-Páez,Helen; Ortiz,Juan Carlos.
Se analizó la dieta de una población del sapito de cuatro ojos (Pleurodema thaul) de la localidad de Hualpén (Talcahuano, Chile). El estudio se realiza durante los períodos reproductivos (junio-diciembre) que comprenden los años 2000 y 2001. Estos anuros destinan una menor importancia al consumo de presas durante la época reproductiva, por lo que presentan una baja frecuencia de ocurrencia (50,63%). La dieta de P. thaul está compuesta fundamentalmente de artrópodos (IRI = 0,92), con un consumo de menor importancia de vegetales (IRI = 0,035). Se determinó una alta diversidad de ítemes de presa (37 taxa). Los ítemes alimentarios dípteros y arácnidos son los más comunes. No se detectan relaciones entre el tamaño de las presas y el tamaño de los anuros
Tipo: Journal article
Palavras-chave: Dieta; Anfibia; Leptodactylidae; Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100004

¿ES POSIBLE CRIAR TIBURONES?: EL CASO DE LA PINTARROJA COMUN, SCHROEDERICHTHYS CHILENSIS (CHONDRICHTHYES, SCYLIORHINIDAE)
Provedor de dados: 72
Autores: Piaget,Nicole; Hernández,Sebastián; Lamilla,Julio; Vega,Alonso.
La crianza de animales es un fenómeno asociado a los orígenes del hombre moderno. Sin embargo, la crianza de especies marinas está relacionada con la producción intensiva en cultivo con fines comerciales. Este estudio tiene como objetivo determinar la factibilidad de crianza de Schroederichthys chilensis, la pintarroja común, a través de experiencias preliminares en ambiente controlado. Esta especie, endémica del Pacífico Sur-oriental, habita desde Perú (Ancón) hasta Chile Austral, preferentemente en aguas someras. Se colectaron cápsulas con huevos de pintarroja del medio natural, los cuales fueron mantenidos en un laboratorio húmedo. Después de la eclosión, las pintarrojas fueron criadas en estanques de 200, 500 y 1000 L de agua de mar, con flujo de agua...
Tipo: Journal article
Palavras-chave: Schroederichthys chilensis; Tiburones; Cultivo; Dieta; Crecimiento; Pintarroja; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100021

EL ESTATUS TAXONOMICO DE GRAUS FERNANDEZIANUS PHILIPPI 1887: NUEVO REGISTRO GEOGRAFICO Y COMENTARIOS SOBRE GRAUS NIGRA PHILIPPI 1887 (OSTEICHTHYES: PERCIFORMES), EN CHILE
Provedor de dados: 72
Autores: Vargas,Luis; Pequeño,Germán.
El descubrimiento de un dibujo inédito de Graus fernandezianus ha servido para iluminar el origen de este nombre específico y su breve historia taxonómica, resultando no ser sinónimo de Graus nigra, sino más bien de Malapterus reticulatus, una especie de la familia Labridae. Se sugiere cambiar su situación de nomen nudum a sinónimo menor de M. reticulatus. Por otro lado, el hallazgo de un ejemplar de Graus nigra en la costa de Valdivia permite documentar la extensión de su rango geográfico hacia el sur en alrededor de 500 km, en el llamado distrito biogeográfico marino Centro-Chileno. Graus nigra es una especie estrictamente litoral (inter y submareal), que ha sido comercialmente explotada y también es común en las pescas deportivas, aspecto sobre el cual...
Tipo: Journal article
Palavras-chave: Kyphosidae; Labridae; Graus; Malapterus reticulatus; Chile; Pacífico Sur Oriental.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100006

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

Estado de conocimiento de los crustáceos zooplanctónicos dulceacuícolas de Chile
Provedor de dados: 72
Autores: Villalobos,Lorena.
Chile se caracteriza por presentar un marcado gradiente geográfico latitudinal y altitudinal. En él es posible encontrar diferentes cuerpos de agua continentales, cuya diversidad se refleja en la composición de especies zooplanctónicas. En este gradiente se pueden distinguir cinco zonas principales, en las cuales en las últimas décadas se ha recolectado información ecológica y en menor parte taxonómica. En el norte se distingue la zona de lagos y lagunas localizados en el altiplano chileno-peruano, en donde ha sido posible registrar especies endémicas como Daphnia peruviana y especies del género Boeckella. Chile central se caracteriza por una serie de cuerpos acuáticos localizados a baja altura y normalmente de baja profundidad, entre los zooplanctontes...
Tipo: Journal article
Palavras-chave: Zooplancton chileno; Grupos taxonómicos; Especies endémicas; Daphnia; Boeckella.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100007

FORAMINIFEROS BENTONICOS DEL TALUD CONTINENTAL DESDE CONCEPCION A LAS ISLAS GUAITECAS (36º- 44° S), CHILE (FORAMINIFERA: LAGENINA, MILIOLINA Y ROBERTININA)
Provedor de dados: 72
Autores: Figueroa E,Sylvia; Marchant SM,Margarita; Giglio,Susana; Ramírez,Myriam.
Se describe la foraminiferofauna bentónica calcárea: Lagenina, Miliolina y Robertinina, durante la expedición científica alemana PUCK a bordo del R/V SONNE (Cruise SO _ 156: Valparaíso _ Chiloé, 2001). Las 29 muestras fueron extraídas con multicore entre 125 y 3.485 m de profundidad. En total se obtuvieron 27 individuos/cm³ (&gt; 150 mm), los que se distribuyeron en 56 especies, 21géneros y 11 familias. Se describieron 2 especies nuevas para el área y la ciencia, Fissurina susanae n. sp. recolectada entre los 42ºS y los 44ºS, Oolina margaritae n. sp. encontrada de forma aislada a los 38ºS y luego desde los 42ºS a los 44ºS.
Tipo: Journal article
Palavras-chave: Foraminíferos Bentónicos Calcáreos; Recientes; Taxonomía; Distribución; Pacifico sureste; Nuevas especies.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200014

PRIMER REGISTRO DEL TIBURON PERRO Centroscyllium nigrum (CHONDRICHTHYES: SQUALIDAE) EN AGUAS DEL PACIFICO COLOMBIANO
Provedor de dados: 72
Autores: Rubio,Efraín A.; Pedraza,Milton J.; Zapata,Luis A.
El tiburón perro, Centroscyllium nigrum Garman, 1899, es un representante pequeño de la familia Squalidae que habita en aguas profundas del Pacífico Oriental. Se registra por primera vez un ejemplar hembra adulta en el Pacífico colombiano, capturado mediante trampas en la pesquería del camarón cabezón Heterocarpus hostilis Faxon, 1893, lo cual constituye un importante hallazgo para el área entre el Golfo de Panamá e Islas Galápagos, confirmado su presencia en esta zona
Tipo: Journal article
Palavras-chave: Primer registro; Centroscyllium nigrum; Pacífico colombiano.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100012

Una nueva especie de Gripopterygidae de Chile, Potamoperla testacea n. sp. (Insecta: Plecoptera)
Provedor de dados: 72
Autores: Vera,Alejandro.
Se describe una nueva especie de Gripopterygidae: Gripopteryginae (sensu McLellan 1977) para Chile, Potamoperla testacea n. sp. distribuida entre las regiones Séptima y Undécima. Se dan a conocer ambos sexos y la ninfa, esta última asociada mediante emergencias de laboratorio. Se discute su ubicación genérica.
Tipo: Journal article
Palavras-chave: Taxonomía; Plecoptera; Nueva especie; Gripopterygidae; Potamoperla; Ninfa.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200003

Marine biodiversity in Venezuela: Status and perspectives
Provedor de dados: 72
Autores: Miloslavich,Patricia; Klein,Eduardo; Yerena,Edgard; Martin,Alberto.
Venezuela is among the ten countries with the highest biodiversity in the world, both in the terrestrial and the marine environment. Due to its biogeographical position, Venezuelan marine flora and fauna are composed of species from very different marine bioregions such as the Caribbean and the Orinoco Delta. The ecosystems in the Caribbean have received considerable attention but now, due to the tremendous impact of human activities such as tourism, over-exploitation of marine resources, physical alteration, the oil industry, and pollution, these environments are under great risk and their biodiversity highly threatened. The most representative ecosystems of this region include sandy beaches, rocky shores, seagrass beds, coral reefs, soft bottom...
Tipo: Journal article
Palavras-chave: Venezuela; Marine biodiversity; Conservation; Protected areas; Biological collections.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200012

Refugios naturales y artificiales de Murciélagos (Mammalia:Chiroptera) en la selva baja en el Noroeste de Perú
Provedor de dados: 72
Autores: Díaz,M. Monica; Linares García,Victor Hugo.
Se describen los refugios de murciélagos encontrados en un área de selva amazónica de los alrededores de Iquitos (Departamento Loreto, Perú). Los muestreos en ambientes naturales se realizaron mediante caminatas diurnas y encuestas a pobladores, y en las áreas urbanas y suburbanas fueron diurnos y nocturnos, con visitas a edificios y puentes donde previamente se había registrado la presencia de especímenes. En refugios no modificados se registraron ejemplares apoyados sobre árboles o troncos, en huecos de árboles en pie, dentro de troncos caídos, entre hojas de palmeras, y quebradas en el suelo entre raíces de árboles. Las especies encontradas en este tipo de refugios pertenecen a las familias Emballonuridae y Phyllostomidae. En los refugios modificados se...
Tipo: Journal article
Palavras-chave: Ambientes naturales; Ambientes urbanos; Murciélagos; Refugios.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300005

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

TRANSLOCACION DE PECES NATIVOS EN LA CUENCA DEL RIO LAJA (REGION DEL BIOBIO, CHILE)
Provedor de dados: 72
Autores: Habit,Evelyn; Victoriano,Pedro; Parra,Oscar.
Con el objetivo de conservar la fauna íctica nativa y como medida de mitigación al impacto generado por la interrupción del libre desplazamiento de peces en el río Laja (Región del Biobio), se llevó a cabo un programa de translocación de peces nativos. Entre los años 1997 y 2000 se estudió la composición y estructura comunitaria y poblacional de la ictiofauna del área, determinando la necesidad de transferir ejemplares de tres especies nativas con problemas de conservación: Diplomystes nahuelbutaensis, Trichomycterus areolatus y Percilia irwini. La campaña de translocación se llevó a cabo en enero de 2001, capturando un total de 1835 ejemplares, de los cuales 1.653 se reubicaron vivos. La sobrevivencia obtenida en las tres especies fue alta durante las...
Tipo: Journal article
Palavras-chave: Translocación; Diplomystes nahuelbutaensis; Trichomycterus areolatus; Percilia irwini; Río Laja; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200012

First description of the micro-habitat selection pattern of the island endemic Juan Fernandez Tit-tyrant
Provedor de dados: 72
Autores: Soto,Gerardo E; Vergara,Pablo M; Hahn,Ingo J; Pérez-Hernández,Christian G; Lizama,Marlene E; Baumeister,Julia; Pizarro,Jaime.
The level of specialization of endemic island birds to their native habitats could contribute importantly to increase their extinction risk. We used abundance obtained from mist-netting and radio telemetry data from one individual to determine the micro-habitat use pattern of Juan Fernandez Tit-tyrants (Anairetes fernandezianus) within native forest. The tracked male tit-tyrant established its home range exclusively in core native forest areas. Regression models of abundance and Resource Utilization Functions showed strong micro-habitat preferences of tit-tyrants. The abundance and utilization probabilities of tit-tyrants declined with distance to exotic shrub and increased with distance to human created gaps. Natural heterogeneity in micro-habitat...
Tipo: Journal article
Palavras-chave: Robinson Crusoe Island; Anairetes fernandezianus; Micro-habitat.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100001

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

FORAMINIFEROS PLANCTONICOS DURANTE EL NIÑO 1997-98 DEL AREA DE COQUIMBO (30°S; 73°W), CHILE
Provedor de dados: 72
Autores: Coloma,Cecilia; Marchant,Margarita; Hebbeln,Dierk.
Se estudiaron los foraminíferos planctónicos recientes recolectados con dos trampas de sedimento (CH10-2 y CH11-2) ancladas a una profundidad de 2.300 m frente a Coquimbo (30°S; 73°W), Chile, abarcando un año y medio de muestreo (14 febrero 1997-1 julio 1998), con el objeto de estudiar el evento de El Niño 1997-98 y el estado de conocimiento de la foraminiferofauna del área de Coquimbo. En total se determinaron 26 especies, 6 de ellas propias de aguas cálidas que aparecieron por primera vez en el área de estudio con El Niño 1997-98. Se presenta la revisión taxonómica (sinonimias y combinaciones), caracteres diagnósticos y biología de cada especie, acompañado de una clave específica y microfotografías (SEM)
Tipo: Journal article
Palavras-chave: Foraminíferos planctónicos; Coquimbo; Chile; Biodiversidad; Taxonomía; Nuevos registros; El Niño 1997-98.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100008

SEXUAL AND GEOGRAPHIC VARIATION OF COLOR PATTERNS IN LIOLAEMUS TENUIS (SQUAMATA, LIOLAEMINAE)
Provedor de dados: 72
Autores: Vidal,Marcela A; Ortiz,Juan Carlos; Labra,Antonieta.
We studied sexual and geographic variation of color patterns in the lizard Liolaemus tenuis. We counted the number of scales with different colors in two body regions, in individuals of both sexes, from three groups of populations along a latitudinal range. Color patterns showed sexual and geographic variations; females and the northern group were the darkest. The selective pressures of these color pattern variations are unclear. However, considering that L. tenuis males are territorial and polygamous, we postulate that sexual variation in color would be consequence of sexual selection involving female choice and male-male interactions (e.g. agonistic displays among males). Geographic variation may be determined by predation pressure, as there is a...
Tipo: Journal article
Palavras-chave: Chromatophores; Sexual dimorphism; Lizard; Liolaemus; Chile.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100004

PREFACE
Provedor de dados: 72
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300001

NOTA SOBRE LA ALIMENTACION DE PLEURODEMA BUFONINA BELL, 1843 (ANURA -- LEPTODACTYLIDAE)
Provedor de dados: 72
Autores: Pincheira-Donoso,Daniel.
RESUMEN La dieta de Pleurodema bufonina es estudiada por primera vez, utilizando contenidos digestivos de especímenes preservados. Los ítemes de mayor representatividad fueron: Hormigas (36.4%), ninfas (21.3%) y semillas (13.3%)
Tipo: Journal article
Palavras-chave: Dieta; Pleurodema bufonina; Hormigas; Ninfas; Semillas.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100011

THE POLAR ICE COVER - HOW IT IS CHANGING
Provedor de dados: 72
Autores: Comiso,Josefino C.
Global warming of about 0.5 to 1 ºC during the last century has been observed from meteorological stations around the world and postulated to be caused in part by increasing anthropogenic greenhouse gases in the atmosphere. The best regions for detecting the impact of such changes are the polar regions where the signals are supposed to be amplified because of ice-albedo feedbacks. Satellite data reveal that the most remarkable change in the polar regions is in the rapid decline of 9% per decade in the Arctic perennial ice cover which has been observed to be anomalously low in 2002, 2003 and 2004. The sea ice cover in the Bellingshaussen Sea has been observed to be retreating as well, at the rate of 6%/decade. The changes are more modest in the entire...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200023

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

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

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

TRES NUEVAS ESPECIES DEL GENERO SCRIPTANIA HAMPSON 1905, EN CHILE (LEPIDOPTERA: NOCTUIDAE: HADENINAE)
Provedor de dados: 72
Autores: Rodríguez,Marcela A.; Angulo,Andrés O.
Se entrega la descripción de tres nuevas especies pertenecientes al género Scriptania &lt;A HREF="#Hampson1905"&gt;Hampson, 1905&lt;/A&gt;. Las diagnosis de éstas están basadas en las estructuras externas e internas (genitalia) de los adultos. Estas especies presentan distintas localidades de Chile. El material utilizado para las descripciones proviene de recolectas en terreno, para una de las especies y de material sin identificar depositado en las Colecciones Científicas de la Universidad de Concepción, Concepción - Chile (UCCC) y Smithsonian Institution, National Museum of Natural History, Washington - USA (USNM), para las dos especies restantes
Tipo: Journal article
Palavras-chave: Chile; Genitalia; Hadeninae; Nuevas especies; Noctuidae; Lepidoptera; Scriptania.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000100005

Primeras observaciones en características reproductivas en poblaciones chilenas de Copépodos Calanoideos de aguas continentales
Provedor de dados: 72
Autores: De los Rios-Escalante,Patricio; Carreño,Eriko.
Los copépodos calanoideos son abundantes en los ensambles zooplanctónicos de aguas continentales de la Patagonia, y en este contexto, se analizaron parámetros de fertilidad en cuatro especies de calanoideos representativos de aguas continentales de la Patagonia (37°-52° S) con el objetivo de determinar los parámetros de fertilidad en poblaciones de copépodos representativas de la Patagonia chilena. Para este propósito se consideraron dos a cuatro poblaciones de las siguientes especies: Boeckella gracilipes, B. michaelseni, B. poppei, y Tumeodiaptomus diabolicus, se consideraron individuos hembras con huevos a las que se midió el largo total, número de huevos y la razón entre número de huevos con el largo total. Los resultados mostraron que a nivel de...
Tipo: Journal article
Palavras-chave: Copépodos; Zooplankton; Lagos Patagónicos.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000200005

Primeros estadios del ciclo de vida de peces nativos del Río San Pedro (Cuenca del Rio Valdivia, Chile)
Provedor de dados: 72
Autores: Montoya,Germán; Jara,Alfonso; Solis-Lufí,Katherin; Colin,Nicole; Habit,Evelyn.
Los estadios de huevos, larvas y juveniles de los peces de agua dulce nativos de Chile son prácticamente desconocidos. Conocer su estacionalidad, morfología y uso de hábitat es relevante para comprender su biología y permitir la conservación de esta ictiofauna altamente amenazada. Asimismo, los primeros estadíos del ciclo de vida de los peces determinan la persistencia de las poblaciones en el tiempo. Dado esto, el objetivo del presente trabajo fue dar a conocer y describir los resultados de intensivos muestreos (465 días) destinados a encontrar los primeros estadíos de las 14 especies nativas que habitan el río San Pedro (cuenca del Valdivia). Los muestreos se efectuaron desde octubre de 2005 a marzo de 2008. Se encontraron huevos, larvas y juveniles de...
Tipo: Journal article
Palavras-chave: Huevos; Larvas; Juveniles; Peces nativos; Chile.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100008

STATISTICAL ANALYSES WITH METEOROLOGICAL FACTORS, AND APPLICATIONS OF RS AND GIS TECHNIQUES FOR RED TIDE FORMATION IN THE KOREAN COASTAL WATERS
Provedor de dados: 72
Autores: Yoon,Hong-Joo; Cho,Han-keun; Byun,Hye-Kyung.
It was studied on the choice of potential area for red tide occurrence from oceanographic factors. Oceanographic factors of favorable marine environmental conditions for the red tide formation included warm water temperature, low salinity, high suspended solid, low phosphorus, low nitrogen. It was founded the potential areas for red tide occurrence in August 2000 by GIS conception: Yeosu~Dolsan coast, Gamak bay, Namhae coast, Marado coast, Goheung coast, Deukryang bay, respectively
Tipo: Journal article
Palavras-chave: Red tide; Oceanographic factors; Marine GIS.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300052

IXODES URIAE WHITE 1852 (ACARI: IXODIDAE) ASSOCIATED WITH THE PAPUA PENGUIN, PYGOSCELIS PAPUA (FORSTER), IN THE ANTARCTIC PENINSULA
Provedor de dados: 72
Autores: Casanueva,María E.; Moyano,Hugo I.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200012

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

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

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

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

SEA LEVEL VARIATIONS AND SEA SURFACE CIRCULATIONS IN THE KOREAN SEAS BY SATELLITE ALTIMETER DATA
Provedor de dados: 72
Autores: Hong-Joo,Yoon; Yeong-Seup,Kim; Byong-Hyuk,Kwon.
Sea level variations and sea surface circulations in the Korean seas were observed by Topex/Poseidon altimeter data from 1993 through 1997. In sea level variations, the West and South Sea showed relatively high variations with comparison to the East Sea. Then, the northern and southern area in the West Sea showed the range of 20~30cm and 18~24cm, and the northern west of Jeju island and the southern west of Tsushima island in the South Sea showed the range of 15~20 cm and 10~15 cm, respectively. High variations in the West Sea was results to the inflow in sea surface of Yellow Sea Warm Current (YSWC) and bottom topography. Sea level variations in the South Sea was due to two branch currents (Jeju Warm Current and East Korea Warm Current) originated from...
Tipo: Journal article
Palavras-chave: Sea level variations; Sea surface circulations; Altimeter.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300051

Resiliencia en la Revista Gayana: Volver a la Normalidad
Provedor de dados: 72
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100001

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

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

Nuevos registros de ostrácodos no-marinos (Crustacea, Ostracoda) en Patagonia Occidental, Chile
Provedor de dados: 72
Autores: CÁRDENAS,JAVIERA; DIAZ,ANALÍA; ALVAREZ,DENISSE; URRUTIA,ROBERTO.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100011

Histopathological findings in Gonads of Xenopus laevis from Central Chile
Provedor de dados: 72
Autores: LARENAS,JULIO; JAQUE,MACARENA; BUSTOS-LÓPEZ,CARLOS; ROBLES,CAROLINA; LOBOS,GABRIEL; MATTAR,CÉSAR; VALDOVINOS,CARLOS E.
In order to perform a gonadal histological study, adult specimens of Xenopus laevis at four sites in the central region of Chile were captured. The results showed no alterations in gonadal female instead the males showed testicular histological abnormalities, features of endocrine disruption, possibly generated by environmental pollution.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000100009

Reduction of hexavalent cromium by Serratia marcecens immobilized on active carbon and their potencial use in bioremediation
Provedor de dados: 72
Autores: Campos,Víctor; Moraga,Rubén; Fernández,Ítalo; Yáñez,Francisco; Valenzuela,Ariel; Mondaca,María-Angélica.
S. marcescens, cepa tolerante a cromato, presenta la capacidad de formar biopeliculas y transformar el 95 % de cromato presente en el medio a Cr(III), compuesto menos tóxico, después de 48h de incubación, a una velocidad de transformación de 1.67 mg L-1 h-1. S. marcescens puede ser utilizado en biorremediation de residuos contaminados con cromato.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100008

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

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

Implicancias Paleoclimáticas y Biogeográficas de Moluscos Terrestres y Dulceacuícolas del Holoceno Tardío en Isla Mocha, Provincia de Arauco, Chile
Provedor de dados: 72
Autores: Jackson,Donald; Campbell,Roberto; Constanza,Roa; Jackson,Douglas.
Evidencia estratigráfica de moluscos terrestres (Endodontidae) y dulceacuícolas (Sphaeridae, Amnicolidae y Succineidae) procedente de contextos arqueológicos de la Isla Mocha, sugieren una marcada tendencia a condiciones más húmedas hacia finales del Holoceno Tardío (post-900 A.P.), en coherencia con antecedentes polínicos previamente conocidos. Estos moluscos proporcionan relevante información para discutir el proceso colonizador de micro-moluscos en esta Isla.
Tipo: Journal article
Palavras-chave: Arqueología; Biogeografía; Isla Mocha; Moluscos; Paleoclima.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200002

Primer registro de Abrothrix jelskii (Thomas 1824) para Chile
Provedor de dados: 72
Autores: VALLADARES FAÚNDEZ,PABLO; ÁLVAREZ HENRÍQUEZ,NICOLE; URRUTIA,NATALIA; NASSAR SAN MARTÍN,CARLOS; IRIARTE,AGUSTÍN.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200013

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

TRYPANOSOMA HUMBOLDTI EN SCHROEDERICHTHYS CHILENSIS (CHONDRICHTHYES, ELASMOBRANCHII, SCYLIORHINIDAE) COMO INDICADOR NO DESTRUCTIVO DE CONTAMINACION
Provedor de dados: 72
Autores: Silva,Víctor; Valenzuela,Ariel; Ruiz,Paulo; Oyarzún,Ciro.
La contaminación de las zonas costeras por la actividad humana es un problema que se ha incrementado en Chile, siendo caleta Lenga una de las zonas más contaminadas del país. Debido a la presencia de tripanosomas y eosinofilia descritas previamente en pintarroja, Schroederichthys chilensis (Guichenot 1848), se desarrolló un método para cuantificar Trypanosoma humboldti (Morillas et al. 1987) con el fin de disponer de una estrategia no destructiva para evaluar contaminación química. Para ello se obtuvo sangre de pintarroja en Dichato (zona control) y en Lenga (zona problema) durante los meses de septiembre y octubre de 2003 y se cuantificó el hemoparásito utilizando cámaras Kova. El conteo de tripanosomas fue menor en Lenga (5,7 tripanosomas/ml) respecto de...
Tipo: Journal article
Palavras-chave: Pintarroja; Schroederichthys chilensis; Sangre; Tripanosoma; Contaminación; Eosinófilos.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100020

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

PAN OCEAN REMOTE SENSING CONFERENCE-2004: RESUMENES
Provedor de dados: 72
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300057

EVALUACION DE RIBERA Y HABITAT FLUVIAL A TRAVES DE LOS INDICES QBR E IHF
Provedor de dados: 72
Autores: Palma,Alejandro; Figueroa,Ricardo; Ruiz,Víctor H.
El desarrollo de métodos para evaluar de manera rápida y efectiva un sistema hidrográfico, pero sin perder la capacidad de integrar información de la salud del sistema, ha despertado un alto interés en el último tiempo. El presente estudio evaluó la condición ecológica de la parte alta del estero Ñonguen (primero cinco kilómetros) durante dos periodos estacionales, evaluando 5 transectos de 100 metros, separadas aproximadamente por un kilómetro. Para ello se aplicaron dos índices desarrollados para climas mediterráneos en la península ibérica: el índice de calidad de ribera (QBR) y el índice de habitat fluvial (IHF). Los resultados indican que estos índices entregan una aproximación confiable de la calidad de la ribera del río y del cauce mismo. Se discute...
Tipo: Journal article
Palavras-chave: QBR; IHF; Mediterráneo; Chile.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100009

SEASONAL AND ANNUAL VARIATIONS OF HEAT FLUXES OVER THE SEA AROUND THE KOREAN PENINSULA BASED ON SATELLITE DATA
Provedor de dados: 72
Autores: Hong,Gi-Man; Young-Seup,Kim; Byung-Hyuk,Kwon; Hong-Joo,Yoon.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200052

First record of Homoeographa lanceolella Ragonot (Lepidoptera: Pyralidae: Phycitinae) in Chile
Provedor de dados: 72
Autores: VARGAS,HÉCTOR A.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200201

OBITUARIO: María Teresa López Boegeholz
Provedor de dados: 72
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200001

Scale analysis of carabids richness (Coleoptera: Carabidae) in southern South America
Provedor de dados: 72
Autores: MUÑOZ-ESCOBAR,CHRISTIAN; ROIG-JUÑENT,SERGIO; CARRARA,RODOLFO; JEREZ,VIVIANE.
The southern South America presents a complex history of geomorphological and climatic events, which have modulated and fragmented the southwestern part of the Andes mostly. Given the complexity of the southern landscape, the analysis of the hierarchical components alpha-&amp;#945;, beta-&amp;#946; and gamma-&amp;#947; on carabid diversity allows exploring the responses of species to spatial changes patterns according to the scales of the landscape. In order to understand how spatial scales influence the carabid diversity in southern South America, we used an approach at multiple spatial scales of multiplicative diversity partitioning. We included four spatial scales in our analysis: among 0.25° quadrats, 0.5° quadrats, provinces and biogeographic...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200007

MEAN AND VARIANCE OF THE FORWARD FIELDS PROPAGATED THROUGH 3D RANDOM INTERNAL WAVES WITH RAYLEIGHT-BORN SCATTERING
Provedor de dados: 72
Autores: Ratilal,Purnima; Chen,Tianrun; Makris,Nicholas C.
The mean and variance of the acoustic field forward propagated through an ocean waveguide containing random internal waves is modelled using a normal mode formulation [1] that takes into account the 3-D interaction of the acoustic field with medium inhomogeneities. The effects of dispersion, attenuation and redistribution of modal energy due to random multiple scattering in the forward azimuth are treated analytically. The inhomogeneous medium's scatter function density is modelled using the Rayleigh-Born approximation to Green's theorem to account for random fluctuations in density and compressibility caused by the internal waves. The generalized waveguide extinction theorem [2] is applied to determine the attenuation due to scattering from the internal...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300034

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

Estado de conocimiento de los peces dulceacuícolas de Chile
Provedor de dados: 72
Autores: Habit,Evelyn; Dyer,Brian; Vila,Irma.
La ictiofauna nativa de los sistemas límnicos de Chile se compone de 11 familias, 17 géneros y alrededor de 44 especies, incluyendo dos lampreas. De éstas, 81% son endémicas de la provincia biogeográfica chilena y 40% se encuentran clasificadas en peligro de extinción. Los grupos más representados corresponden a los órdenes Siluriformes (11 especies), Osmeriformes (9 especies) y Atheriniformes (7 especies). También están representados en Chile los ciclóstomos Petromyzontiformes (2 especies), y los teleósteos Characiformes (4 especies), Cyprinodontiformes (6 especies), Perciformes (4 especies) y Mugilifromes (1). Latitudinalmente, la mayor riqueza de especies ocurre en la zona centro-sur de la provincia Chilena, en tanto que los extremos norte y sur son de...
Tipo: Journal article
Palavras-chave: Peces; Sistemas dulceacuícolas; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100016

The Census of Marine Life: Understanding Marine Biodiversity Past, Present and Future
Provedor de dados: 72
Autores: O'Dor,R.K.; Yarincik,K.
As an overview provided to the South American Workshop on Marine Biodiversity, this article presents the unique collaborative approach of the Census of Marine Life (CoML) to increasing our knowledge of the abundance, distribution and diversity of marine life throughout the world's oceans. Five elements comprise the foundation of the research program, providing information and methods useful for enhancing our understanding of marine biodiversity, both historically and today, and making sound predictions of biological diversity in the future. (1) A series of initial field projects will demonstrate techniques or technologies to be applied to future studies. Some of these will test new technologies in well-known areas of the ocean, but most will take place in...
Tipo: Journal article
Palavras-chave: Marine biodiversity; Census of Marine Life; CoML.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200003

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

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

FEATURING ENSO 1997-2000 IN CENTRAL CHILE
Provedor de dados: 72
Autores: Bello,Mónica; Castillo,Manuel; Maturana,Jenny; Valenzuela,Claudia; Barbieri,M Angela.
Using satellite images of the area between 32-36°S and 71-75°W, from October 1997 to September 1999, temporal and spatial variability of sea surface temperature (SST) was analyzed. During this period of time, one of the most intense episode of the last century of the warm phase (El Niño) and the beginning of the cold phase (La Niña) of the ENSO cycle were registered, allowing to identify differences in the thermal surface structure. During the warm phase, cold water isotherms in the coastal region (upwelling) warmer than usual were presented, and temperature gradients offshore were smaller than in the cold phase. Several reports suggest that a large part of the Eastern Ocean Pacific Boundary variability (particularly at low frequencies) has equatorial...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200008

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

FLUJO DE PLOMO PARTICULADO A LOS SEDIMENTOS MARINOS Y SU INCORPORACION EN PARAPRIONOSPIO PINNATA (POLYCHAETA: SPIONIDAE) EN BAHIA CONCEPCION (36° Lat. S), CHILE
Provedor de dados: 72
Autores: Muñoz,Práxedes; Salamanca,Marco.
Bahía Concepción (36° Lat. S) es una de las zonas costeras más industrializadas de Chile con una gran actividad portuaria y pesquera. Presenta una alta productividad durante los períodos de surgencia, generando así una alta tasa de sedimentación de material particulado al cual se asocia el plomo (Pb). Este es un elemento altamente insoluble y reactivo con las partículas, siendo disponible rápidamente para las comunidades bentónicas. El principal objetivo de este estudio fue determinar la concentración de Pb en el material particulado y en el gusano Paraprionospio pinnata, organismo sedimentívoro descrito como representativo de la fauna bentónica de Bahía Concepción. Para ello, se instalaron 2 trampas de sedimentación por un período de 15 días, ubicadas a...
Tipo: Journal article
Palavras-chave: Pb; Flujos; Bioacumulación; Material particulado; Sedimentos; Bahía Concepción; Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200007

REDESCRIPCION DE LIMATULOIDES lIMATULUS (BRAUM) DUBPIS, 1964 (TREMATODA, LECITHODENFRIIDAE), UN PARASITO DE TADARIDA BRASILENSIS (GEOF.) (CHIROPTERA, MOLOSSIDAE) DE ARGENTINA
Provedor de dados: 72
Autores: Lunaschi,Lía I.
Se redescribe a Limatuloides limatulus (Braun 1900) Dubois 1964 sobre la base de un ejemplar adulto obtenido del intestino de Tadarida brasiliensis Geof. (Chiroptera, Molossidae) capturado en Isla Talavera, provincia de Buenos Aires, Argentina. La descripción efectuada por Braun (1900) es breve y está basada en un espécimen colectado del intestino de un Molossus sp. capturado en Ipanema, Brasil. Dada la pérdida del material tipo y queL. limatulus no ha sido registrada nuevamente desde su descripción original, el estudio morfológico detallado de nuevo material permite efectuar una mejor caracterización de esta especie. El hallazgo de L. limatulus en T. brasi-liensis de Argentina constituye el segundo registro descripción original y permite ampliar el...
Tipo: Journal article
Palavras-chave: Limatuloides limatulus; Trematoda; Lecithodendriidae; Chiroptera; Argentina.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100011

Remotly Sensed Sea Surface Temperature from Aircraft
Provedor de dados: 72
Autores: Kwon,B. H.; Benech,B.; Durand,P.; Kim,Y. S.
The experiment was conducted around south of the Azores islands, in the middle eastern part of the northern-Atlantic basin. The experimental area was situated between 31°N-38°N and 21°W-28°W. The experiment was performed in order to improve our knowledge of ocean-atmosphere interactions from the local-scale to the meso-scale. The sea surface temperature remotely measured by aircraft was corrected considering the radiation flux divergence. From the descending IR flux in function of the difference between the surface temperatures measured from the ship and the aircraft (SSTshipSSTaircraft), the difference decreases when the IR flux increases. The sea surface temperature was corrected of the radiation flux divergence of the atmosphere between the sea surface...
Tipo: Journal article
Palavras-chave: Sea surface temperature; Aircraft; Radiation flux divergence; Infrared radiation.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300007

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

VALIDATION OF SATELLITE DERIVED LHF USING COARE_3.0 SCHEME AND TIME SERIES DATA OVER NORTH-EAST INDIAN OCEAN
Provedor de dados: 72
Autores: Muraleedharan,P.M.; Pankajakshan,T.; Sathe,P.V.
Time series measurement of surface meteorological parameters using an Autonomous Weather Station and Moored Buoy positioned at 10.5 N and 72 E from July to November 2000 are used to compute latent heat flux (LHF) using COARE_3.0 algorithm for validating Special Sensor Microwave Imager (SSMI) derived LHF data. Mean positive and negative biases are observed between satellite and sea truth derived LHF estimates for summer (July to Sept) and inter-monsoon (Oct-Nov.) seasons respectively. Comparison during summer season exhibits very high correlation ( 75%) and is increasing progressively with longer climatologies. Satellite underestimates higher LHF values during summer while it overestimates lower LHF values in inter-monsoon season. Root Mean Square Deviation...
Tipo: Journal article
Palavras-chave: Validation; Autonomous Weather Station; COARE_3.0 Scheme; Latent Heat Flux; Summer Monsoon.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300019

SPACE-TIME CHARACTERIZATION OF PUNTA LAVAPIE UPWELLING SYSTEM THROUGH SS NOAA/AVHRR IMAGES
Provedor de dados: 72
Autores: Paolini Cuadra,Pedro; Rodríguez,Fabiola; Gallardo,Carlos.
Punta Lavapié, located in the VIII region of Bio-Bio, is a very important coastal upwelling area which presents high and low activity phases during the year. Through remote sensing technology, a spatial and temporal characterization was generated for Punta Lavapié upwelling system, which has, indeed, economic significance due to big fishing volumes in a normal year. A long-term time series of three years (from December 1998 until December 2001) of SST NOAA/AVHRR images was processed for Punta Lavapié. Some SST images with clouds were reconstructed through a digital image interpolator developed by CEE, which allowed to have more images into the time series. Seasonal average images and advective vector fields through the MCC objective method were obtained to...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300026

MOLUSCOS TERRESTRES DE CHILE. SINONIMIA Y PROBLEMAS RELACIONADOS: 1. FAMILIAS VERONICELLIDAE, PIPILLIDAE Y ACHATINELLIDAE (GASTROPODA: PULMONATA)
Provedor de dados: 72
Autores: Stuardo,José R.; Vargas-Almonacid,Patricio.
Se examina el status taxonómico de las especies chilenas de las familias Veronicellidae, Pupillidae y Achatinellidae, como parte de una serie de análisis taxonómicos sobre los moluscos terrestres de Chile que se elabora como seguimiento a la sinopsis del grupo publicada con anterioridad (&lt;A HREF="#StuardoyVega"&gt;Stuardo &amp;amp; Vega 1985&lt;/A&gt;). Son pocos los trabajos trascendentes publicados después de la sinopsis. En la actualidad hay descritas dos especies de Veronicellidae, dos de Pupillidae y 21 especies de Achatinellidae. De éstas, el único registro de Chile para Heterovaginina limayana Lesson es cuestionable y la subespecie Pupoides (Ischnopupoides) minimus costatus Biese, es considerada inválida. Se presenta una exhaustiva compilación de...
Tipo: Journal article
Palavras-chave: Mollusca; Sinonimias; Veronicellidae; Pupillidae; Achatinellidae; Neotropical; Oceanía; Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200007

PARAMETROS BIOLOGICO-PESQUEROS DE LA JIBIA, DOSIDICUS GIGAS (ORBIGNY, 1835) (CEPHALOPODA: OMMASTREPHIDAE), FRENTE A LA COSTA DE CHILE CENTRAL (29ºS-40ºS) DURANTE 1993-1994
Provedor de dados: 72
Autores: Chong,Javier; Oyarzún,Ciro; Galleguillos,Ricardo; Tarifeño,Eduardo; Sepúlveda,Roger; Ibáñez,Christian.
Se presentan los resultados de dos cruceros de pesca de investigación de la jibia, Dosidicus gigas (Orbigny 1835) realizados entre julio de 1993 y enero de 1994 en la Zona Económica Exclusiva de Chile comprendida entre los 29º S y 40º S. En cada lance se registró el día, hora, duración del lance, así como el volumen de la captura por lance y máquina potera, para efectuar estimaciones de abundancia relativa. A los ejemplares capturados se les determinó la longitud dorsal del manto (LDM), peso total, peso eviscerado, peso manto, sexo y se les extrajo el tracto digestivo, para un análisis del contenido estomacal. Las jibias sólo fueron capturadas entre los 29º S y los 30º S. En el primer crucero (invierno) se registraron ejemplares grandes (71 a 98 cm LDM) y...
Tipo: Journal article
Palavras-chave: Jibia; Dosidicus gigas; Tamaño corporal; Alimentación.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200012

Patrones de riqueza y diversidad de especies en un ensamble de pompílidos (Hymenoptera: Pompilidae) del bosque siempreverde templado Valdiviano, capturados con trampa Malaïse
Provedor de dados: 72
Autores: Ramos Sanz,Mar; Lanfranco Leverton,Dolly; Holmqvist Álvarez,Carolina; Rodríguez Olmo,Antonio.
Los bosque templados del sur de Chile y Argentina mantienen altos niveles de diversidad y endemicidad. A pesar de ello pocos son los estudios centrados en cuantificar los patrones de diversidad de los taxa de mayor riqueza específica como los insectos en estos ecosistemas. uno de los grupos menos estudiados a pesar de su alta diversidad es el de los insectos parasitoides. En este trabajo se analizan los patrones de riqueza y diversidad de uno de los grupos de parasitoides con mayor endemicidad, los pompílidos (Hymenoptera: Pompilidae). Se muestrearon utilizando trampas Malaïse, cuatro hábitats de bosque siempreverde costero en la provincia de Valdivia durante 21 fechas, obteniéndose 9 especies de pompílidos pertenecientes a 3 géneros. A pesar del bajo...
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000200008

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

First report of an arboreal scorpion (Bothriuridae: Urophonius) from the temperate forests of southern Chile
Provedor de dados: 72
Autores: Pizarro-Araya,Jaime; Ojanguren-Affilastro,Andrés A; Prendini,Lorenzo.
We present the first observations of an arboreal bothriurid scorpion and the first report of an arboreal scorpion from the temperate forests of southern Chile. Urophonius tumbensis Cekalovic 1981 was observed and captured with ultraviolet (UV) light at a height of up to 6 meters on trunks of Cryptocarya alba (Molina) Looser trees in the Hualpén Botanical Reserve (Bío Bío Region, Chile).
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200008

Estado de conocimiento de los malacostráceos dulceacuícolas de Chile
Provedor de dados: 72
Autores: Jara,Carlos G; Rudolph,Erich H; González,Exequiel R.
La fauna de crustáceos malacostráceos limnéticos, en el territorio de Chile continental, está compuesta por seis especies de camarones, i.e., cinco parastácidos de los géneros Parastacus, Samastacus y Virilastacus y un palemónido del género Cryphiops, 18 especies de anomuros del género Aegla, siete especies de anfípodos gamarídeos del género Hyallela y una especie de isópodo aselotano del género Heterias. La distribución conjunta abarca desde Arica a Punta Arenas, pero la mayor parte de las especies tiene rango geográfico restringido. La mayor densidad de taxa ocurre entre las regiones VIII y X, donde el número de taxa por Región varía entre 11 y 15, siendo la X Región la que tiene el número mayor. Índices derivados de un estudio sobre relaciones...
Tipo: Journal article
Palavras-chave: Malacostráceos; Diversidad; Conservación; Amphipoda; Isopoda; Decapoda; Chile; Limnología.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100008

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

Lice (Insecta: Phthiraptera) From species of the families Furnariidae, Tyrannidae, Turdidae and icteridae (Aves: Passeriformes) from Chile
Provedor de dados: 72
Autores: González-Acuña,Daniel; Vergara,Francisco; Moreno,Lucila; Barrientos,Carlos; Ardiles,Karen; Cicchino,Armando.
A total of 185 birds (nine captured alive and 176 preserved in a museum), belonging to the families Furnariidae (n=14), Tyrannidae (n=4), Turdidae (n=24) and Icteridae (n=143) (Aves: Passeriformes) were searched for lice (Phthiraptera: Philopteridae, Menoponidae). The species collected and identified were: Furnaricola titicacae Carriker 1949 from Phleocryptes melanops (Vieillot 1817), and Picicola cuniculariae Cicchino 1981 from Geositta rufipennis fasciata (Burmeister 1860) (Furnariidae); Picicola foedus (Kellogg &amp;amp; Chapman 1899) from Xolmis pyrope (Kittlitz 1830) (Tyrannidae); Brueelia magellanica Cicchino 1986, B. persimilis Cicchino 1987 and Menacanthus eurysternus (Burmeister 1838) from Turdus falcklandii Quoy &amp;amp; Gaimard 1824 (Turdidae);...
Tipo: Journal article
Palavras-chave: Lice; Phthiraptera; Birds; Passeriformes; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200008

Thermal Ecology Of Pleurodema thaul (Amphibia: Leptodactylidae)
Provedor de dados: 72
Autores: ITURRA-CID,MYRIAM; VIDAL,MARCELA; LABRA,ANTONIETA; ORTIZ,JUAN CARLOS.
The biodiversity of the entire planet is threatened by global warming, and among vertebrates, Amphibia is the taxon most negatively affected by this problem. Amphibians depend on an external heat source to achieve and maintain an adequate body temperature, which has a significant impact on their fitness. Therefore, an increase in the average environmental temperature will affect, probably in a negative way, the general performance of amphibians. This makes it imperative to increase our scarce knowledge of amphibian thermoregulation. The aim of this work is to contribute to the knowledge of amphibian thermoregulation by studying the winter thermal ecology of one of the most widely distributed species in Chile, Pleurodema thaul. Individuals were collected...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000100004

RELACION ENTRE CARACTERISTICAS DEL TRACTO DIGESTIVO Y LOS HABITOS ALIMENTARIOS DE PECES DEL RIO YUCAO, SISTEMA DEL RIO META (COLOMBIA)
Provedor de dados: 72
Autores: Sánchez,René M.; Galvis,Germán; Victoriano,Pedro F.
Se analizó los contenidos estomacales de 21 especies de peces capturadas en el río Yucao, en dos sitios y periodos anuales diferentes. Las estructuras del tracto digestivo fueron clasificadas de acuerdo a la posición de la boca, forma del estómago y dientes, longitud del intestino y número de braquispinas y ciegos pilóricos. Estas características se relacionaron con cuatro hábitos alimentarios generalizados: detritívoros, herbívoros, consumidores de perifiton (perifitófagos) y omnívoros. La forma de los dientes y del estómago fueron las estructuras del digestivo que, en los análisis de correspondencia, se relacionaron mejor con los diferentes tipos de alimentación. De acuerdo a la composición espacial y temporal de los contenidos estomacales en cada...
Tipo: Journal article
Palavras-chave: Río Yucao; Contenido estomacal; Morfología del tracto digestivo; Peces tropicales.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100010

THE SAC-D/AQUARIUS MISSION, SCIENTIFIC OBJECTIVES
Provedor de dados: 72
Autores: Colomb,F. Raul; Lagerloef,Gary S.E; Le Vine,David; Nollmann,Ida; Chao,Yi.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200022

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

Population cytogenetics of the "Northern Mod 1" chromosomal race of Liolaemus monticola Müller &amp;amp; Helmich (Iguanidae) from Central Chile
Provedor de dados: 72
Autores: Lamborot,Madeleine; Ossa,Carmen Gloria; Vásquez,Mauricio.
We report the "Northern 2n=38-40, modification 1" race from three localities of the Liolaemus monticola complex in Chile that appears to be chromosomally and geographical intermediate between two previously described "Northern 2n=38-40" and "Multiple Fission, 2n=40-44 (MF)" races. This race retains the same "Northern" chromosomal features, but differs by being both polymorphic for an enlarged chromosome pair 6 and for a pericentric inversion in chromosome pair 7; these rearrangements are present in the "MF" race. At the population cytogenetics level, the mean proportion of polymorphic chromosomes in the "Northern, mod 1" race is relatively high and intermediate between the Northern" and "MF" races, while the chromosome "alleles" in the "Northern, mod 1"...
Tipo: Journal article
Palavras-chave: Hybridization Liolaemus monticola "Northern modification 1; 2n = 38-40" chromosomal race population cytogenetics.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000200002

Expansion range of the brick Seabass , Acanthistius pictus (Tschudi, 1846) (Serranidae: Osteichthyes), in Chilean waters
Provedor de dados: 72
Autores: Mansur,Lidia E.; Godoy,Natalio; Gelcich,Stefan; De La Barra,Cristian; Navarro,Ramón.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200198

OCEANIC CURRENTS IN THE SOUTHEASTERN OACIFIC OCEAN AS REVEALED BY SATELLITE ALTIMETRY DATA
Provedor de dados: 72
Autores: Sirota,A.M.; Lebedev,S.A.; Kostianoy,A.G.
Ten-days sea level anomalies (SLA) charts, based on the TOPEX/Poseidon (T/P) altimetry data for 1992-2003, as well as corresponding charts of sea surface dynamic heights (constructed by the superposition of SLA distributions over the climatic dynamic topography calculated from mean temperature and salinity data of WOA-1998 Atlas relative to 1000 m depth), were used to study main oceanic currents in the region 45-20°S, 110-70°W. Totally 377 T/P cycles for the period between 23 September 1992 and 25 February 2003 have been used for the analysis. Spatial and seasonal variability of the South Pacific Current has been investigated basing on the charts of dynamic heights gradients. The analysis allowed to distinguish zones with different degree of the current...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300040

PREFERENCIA Y MANIPULACION FLORAL DE CENTRIS RODOPHTHALMA PEREZ (HYMENOPTERA: ANTHOPHORIDAE): FLORAL PREFERENCE AND MANIPULATION OF CENTRIS RODOPHTHALMA PEREZ (HYMENOPTERA: ANTHOPHORIDAE)
Provedor de dados: 72
Autores: Chiappa,Elizabeth; Rodríguez,Sharon; Bascuñán,Rossana.
Se estudió la manipulación y preferencia floral de Centris rodophthalma Pérez en 3 localidades de la IV Región de Chile, caracterizadas, principalmente, por representantes de la familia Fabaceae y condiciones ambientales estrictas que reducen el rango de recursos disponibles para la abeja. Se estimó la influencia de factores florales de 6 especies de plantas en la preferencia de C. rodophthalma, con el objeto de determinar el grado de correspondencia entre la morfología de la abeja y la elección de la flor, considerando: longitud de la lengua de la abeja; tamaño, diseño, color y estructura de la flor; profundidad de la corola; capacidad volumétrica de nectarios y medida del ángulo formado entre nectario y resto del estandarte. De estas variables, sólo las...
Tipo: Journal article
Palavras-chave: Centris; Fabaceae; Interacción insecto-planta; Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200002

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

RESPUESTA DE LA COMUNIDAD DE PECES AL DRAGADO DE RIOS COSTEROS DE LA REGION DEL BIOBIO (CHILE)
Provedor de dados: 72
Autores: Ortiz-Sandoval,Juan J; Ortiz,Néstor; Cifuentes,Roberto; González,Jorge; Habit,Evelyn.
Las comunidades de peces de agua dulce presentan grados de resistencia y resiliencia a actividades antrópicas, los cuales se relacionan positivamente con su diversidad específica y negativamente con los niveles de intervención previa. Los ríos costeros de la zona Centro-Sur de Chile se caracterizan por albergar una diversa ictiofauna, principalmente en sus zonas bajas. En particular, el sector de potamón de los ríos Andalién y Nonguen, ambos insertos en la ciudad de Concepción, son de alto valor de conservación de su biodiversidad. En estos sectores, los eventos recurrentes de inundación de zonas residenciales, construidas en las planicies de inundación, han llevado a que ambos cauces sean dragados y semicanalizados. Las respuestas de las comunidades de...
Tipo: Journal article
Palavras-chave: Nematogenys inermis; Peces nativos; Respuesta comunitaria; Río Andalién; Río Nonguén.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100010

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

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

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

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

LABORATORY OF GEOMATICS AND APPLIED INFORMATICS CENTRE FOR ENVIRONMENTAL SCIENCES EULA-CHILE UNIVERSITY OF CONCEPCION
Provedor de dados: 72
Autores: Debels,P; Aguayo,M; Vega,C.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200026

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

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

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

GROWTH OF JUVENILE MARINE SILVERSIDE (Odontesthes regia Humboldt, 1821) (Atherinidae) IN SEA NET PEN CAGES
Provedor de dados: 72
Autores: Orellana,Francisco A; Toledo,Héctor E.
Juvenile silversides (Odontesthes regia Humboldt, 1821) reared in a sea net pen system performed well and adapted rapidly to this type of confinement. Values obtained for growth and mortality parameters in a period of 12 months, are similar to those observed in other marine fish cultured at industrial levels. The value of SGR obtained for the whole period (0.57), was similar to the value obtained in trials with juvenile rainbow trout using 20% replacement of fishmeal with white lupin meal (Lupino albus), over a period of 6 months (SGR=0.58), but lower in relation to trials performed with red tilapia fry (Oreochromis aureus x Oreochromis niloticus) fed with coffee pulp diet (20% fishmeal replacement) where SGR was 1.51, or when compared with Japanese...
Tipo: Journal article
Palavras-chave: Juvenile growth; Marine silverside; Sea net pen cages.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100008

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

REDISCOVERY OF ECHINISCUS RUFOVIRIDIS DU BOIS-RAYMOND MARCUS 1944 (HETEROTARDIGRADA, ECHINISCIDAE): NEW CONTRIBUTIONS TO THE KNOWLEDGE OF ITS MORPHOLOGY, BIOECOLOGY AND DISTRIBUTION
Provedor de dados: 72
Autores: Peluffo,Julio; Moly de Peluffo,María C.; Rocha,Alejandra M.
Numerous specimens of Echiniscus rufoviridis (Heterotardigrada, Echiniscidae) were recorded and studied from urban localities in Argentina. Since the first description of this species by &lt;A HREF="#DuBois-Raymond"&gt;Du Bois-Raymond Marcus in 1944&lt;/A&gt; on Brazilian specimens, it had not been recorded again. The validity of the species is confirmed, its geographic distribution is extended to Argentine localities and new data are provided on its morphology (optical and SEM) and its bioecology. Echiniscus rufoviridis can be clearly separated from the E. viridis, the closest species within the "viridis group", by the possession of depressions with pores on the surface of the cuticle, instead of papillae. On the other hand, an ecological similarity with...
Tipo: Journal article
Palavras-chave: Urban environments; Argentina; Heterotardigrada; Echiniscidae; Echiniscus rufoviridis; Geographic distribution; Morphology; Rediscovery.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200002

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

PROLOGO
Provedor de dados: 72
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100001

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

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

RESISTENCIA TERMITICA DE LA MADERA A POROTERMES QUADRICOLLIS (RAMBUR), TERMITA DE LA MADERA HUMEDA (ISOPTERA, TERMOPSIDAE)
Provedor de dados: 72
Autores: Artigas,Jorge N; Villán,Leonor.
Se uso distintas técnicas - incluyendo las pruebas de Schmidt de virutas; de Wolcott modificada; de preferencia; Standard de arena, Cajas Skaife; y de inanición - para evaluar la resistencia termítica a Porotermes quadricollis (Rambur) de distintas maderas. Como resultado de los ensayos, las maderas se ordenaron según su resistencia termítica en tres. Baja: Pino (natural) Pinus radiata D.Don, Mañío Podocarpus saligna D.Don y Olivillo Aextoxiconpunctatum Ruiz et Pavón. Mediana: Alerce Fitzroya cupressoides (Molina), Pino Insigne aglomerado, Raulí Nothophagus alpina (Poepp. et Endl.) y Roble Nothophagus obliqua (Mirbel). Alta: Laurel Laurelia sempervirens (Ruiz et Pavón), Araucaria Araucaria araucana (Molina) y Lingue Persea tingue (Ruiz et Pavón). El Laurel...
Tipo: Journal article
Palavras-chave: Chile; Madera; Porotermes quadricollis (Rambur); Resistencia termítica; Termite.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100001

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

The known and unknown about Marine Biodiversity in Ecuador (Continental and Insular)
Provedor de dados: 72
Autores: Cruz,Manuel; Gabor,Nikita; Mora,Elba; Jiménez,Roberto; Mair,James.
Ecuador has a high diversity of ecosystems in its coastal and marine territory with beaches, bays, estuaries, cliffs, coastal lagoons and rocky coasts being the most representative. So far, 1,859 marine species have been identified in Ecuador. Of these, 1380 species of non-commercial marine invertebrates and vertebrates, belonging to 8 Phyla and distributed in 25 groups or classes, occur along the coast of Ecuador. These are: Protozoans, 9 groups: Oceanic and estuarine Diatoms, Cyanophyta, Chlorophyta, Dinoflagellates, Coccolithophorida, Silicoflagellates, Euglenophyta, Tintinnids and planktonic and benthic Foraminifera; Cnidaria, 2 classes: Hydromedusae and Scyphomedusae; Mollusca, 5 classes: Wood-boring molluscs and rock-boring and benthic bivalves;...
Tipo: Journal article
Palavras-chave: Biodiversity; Pelagic; Demersal; Benthic; Gulf of Guayaquil.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200010

SIFONAPTEROFAUNA DE TRES ESPECIES DE ROEDORES DE CONCEPCION, VIII REGION-CHILE
Provedor de dados: 72
Autores: Alarcón,Mauricio E.
Se estudió la sifonapterofauna recolectada en los roedores Abrothrix longipilis (Waterhouse), Abrothrix olivaceus (Waterhouse) y Rattus rattus Lineo, durante el período de mayo 2000-febrero 2001. Se informan aspectos taxonómicos y ecológicos que contribuyen al conocimiento de la fauna de sifonápteros de la VIII Región de Chile. Se obtuvo un total de 533 pulgas. Los resultados indican a R. rattus como nuevo hospedero para las pulgas Ctenoparia inopinata Rothschild, Sphinctopsylla ares (Rothschild) y Tetrapsyllus rhombus Smit en Chile y, a Neotyphloceras crassispina Rothschild como un nuevo registro para la Región. Plocopsylla wolffsohni (Rothschild) fue la especie más abundante en invierno y Ctenoparia inopinata en primavera
Tipo: Journal article
Palavras-chave: Pulgas; VIII Región; Nuevo hospedero; Nuevo registro; Roedores.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100003

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

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

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

Observaciones mediante modelos nulos de comunidades zooplanctónicas en lagunas temporales costeras de las Dunas de Puaucho (38º S, Chile)
Provedor de dados: 72
Autores: DE LOS RIOS ESCALANTE,PATRICIO; HAUSNTEIN,ENRIQUE; ACEVEDO,PATRICIO.
El zooplancton lacustre chileno se caracteriza por un alto predominio de copépodos calanoideos y bajo número de especies, lo que está asociado principalmente a condiciones de oligotrofía. El presente estudio es una primera descripción de la comunidad de crustáceos zooplanctónicos y litorales en lagunas temporales en la zona costera de Puaucho mediante el uso de modelos nulos de co-ocurrencia de especies y sobreposición de nicho. Los resultados del modelo de co-ocurrencia de especies indican que las asociaciones de éstas son aleatorias, mientras que el análisis de sobreposición de nicho indica estos no se sobreponen. Los resultados concordarían con descripciones similares para lagos de la Patagonia de Argentina y Chile.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200004

Nuevos registros de cetAceos para la VIII RegiOn, Chile (1997 a 1999)
Provedor de dados: 72
Autores: Hückstädt,Luis A.
La última información respecto a presencia de cetáceos en las aguas de la VIII Región de Chile (ca. 36º a 39ºS) corresponde a estudios realizados a principios de los ochentas y algunos escasos antecedentes esporádicos durante la década de los noventas. En este trabajo, se informa de nuevos registros casuales de cetáceos realizados en la VIII región entre los años 1997 y 1999, correspondientes a ejemplares observados vivos en el mar, así como el hallazgo de ejemplares varados muertos en algunas playas del litoral de la región. Se totalizaron 12 registros diferentes de cetáceos en la Región, correspondientes a las especies Eubalaena australis Desmoilins, 1822, Kogia breviceps (de Blainville, 1838), Mesoplodon densirostris (de Blainville, 1817), Orcinus orca...
Tipo: Journal article
Palavras-chave: Cetáceos; Nuevos registros; Eubalaena australis; Kogia breviceps; Mesoplodon densirostris; Orcinus orca; Grampus griseus; Phocoena spinipinnis; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200010

Physical-Chemical processes and Patterns of Diversity of the chilean eastern boundary pelagic and benthic marine ecosystems: An overview
Provedor de dados: 72
Autores: Escribano,Rubén; Fernández,Miriam; Aranís,Antonio.
The biological diversity of the Chilean marine ecosystem (CME) has recently become an issue of interest to Chilean scientists and authorities concerned about the impact of human activities and ongoing climate change on the structure, functioning, and sustainable use of this large marine region, recognized as one of the most productive ecosystems of the world`s is oceans. In this paper, the available information is examined in order to describe the major environmental characteristics of the CME and its associated flora and fauna, both in the benthic and pelagic systems, with the main goal of identifying environmental discontinuities and boundaries which may serve to define biogeographical units and characterize their biodiversity patterns. Physical and...
Tipo: Journal article
Palavras-chave: Biodiversity; Benthic; Chilean marine ecosystem; Conservation; Pelagic.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200008

PRIMER REGISTRO DE MUSCULIUM ARGENTINUM (D'ORBIGNY 1835) (BIVALVIA: SPHAERIIDAE) EN AGUAS CONTINENTALES CHILENAS
Provedor de dados: 72
Autores: Sobarzo,Cristián; Jara-Segue,Pedro; Peredo,Santiago; Parada,Esperanza.
RESUMEN Se comunica el primer registro de Musculium argentinum (&lt;A HREF="#orbigny"&gt;d'Orbigny 1835&lt;/A&gt;) Bivalvia: Sphaeriidae) sobre la base de especímenes recolectados del fondo fangoso de piletas de engorda de la piscicultura de Lautaro (38&amp;deg; 32' S; 72&amp;deg; 27' W). La descripción y análisis morfométrico de los ejemplares coinciden con los entregados por &lt;A HREF="#ituarte"&gt;Ituarte (1996)&lt;/A&gt;. Con ello se extiende el rango de distribución longitudinal oeste de esta especie, aumentando la diversidad de esféridos para Chile
Tipo: Journal article
Palavras-chave: Sphaeriidae; Musculium argentinum; Bivalvos dulceacuícolas; Biodiversidad; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100006

POSTER ABSTRACTS
Provedor de dados: 72
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300019

WIND DIRECTION SIGNAL IN POLARIZED MICROWAVE EMISSION OF SEA SURFACE UNDER VARIOUS INCIDENCE ANGLES
Provedor de dados: 72
Autores: Pospelov,Michael N.
The paper summarizes the experimental results obtained during a series of aircraft experiments carried out by Space Research Institute in 1980's in the northwestern Pacific. The measurements of wind direction signatures were conducted with K- and Ka-band polarimeters at near-nadir and grazing view angles. These data are compared with the results obtained by JPL-NASA and ETL-NOAA researchers at medium range of view angles, and also with SSM/I data. Both first and second azimuthal harmonics as a function of view angle are analyzed. The experimental results are also compared with theoretical calculations based on the various models of the directional spectrum of wind waves. Reasoning from model calculations and experimental data, an optimal range of...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300032

Estado de conocimiento y conservación de los anfibios de Chile: una síntesis de los últimos 10 años de investigación
Provedor de dados: 72
Autores: CORREA,CLAUDIO; DONOSO,JUAN PABLO; ORTIZ,JUAN CARLOS.
Han transcurrido diez años desde que se publicó la última síntesis general del estado de conocimiento de los anfibios de Chile. Durante este periodo se han realizado numerosos aportes al conocimiento de estos organismos e implementado acciones enfocadas a su conservación. El objetivo de este trabajo es describir los avances realizados en distintas áreas científicas y en el campo de la conservación de los anfibios de Chile durante los últimos diez años, para obtener una visión actualizada de su estado de conocimiento y conservación e identificar algunas áreas que requerirían un mayor esfuerzo de investigación. La actualización se basó en 155 trabajos publicados entre 2006 y 2015, que incluyen artículos científicos de revistas ISI y no ISI, libros, capítulos...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100011

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

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

PHYLLOCAULIS GAYI (PULMONATA: SYSTELLOMMATOPHORA): A NEGLECTED GRANIVORE IN CHILEAN TEMPERATE FORESTS?
Provedor de dados: 72
Autores: Simonetti,Javier A.; Grez,Audrey A.; Bustamante,Ramiro O.
Evidence is advanced suggesting that Phyllocaulis gayi, a large slug in the temperate forests of Chile, might be a significant but overlooked granivore. In a short-term experiment, up to 18% of seeds are preyed upon by P. gayi. The intensity of seed predation is significantly reduced in forest fragments
Tipo: Journal article
Palavras-chave: Forest fragmentation granivory invertebrates Nothofagus; Phyllocaulis.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100013

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

Insectos e infestaciones asociadas al follaje de Nothofagus antarctica (Forst) Oerst (Nothofagaceae) en la cuenca del río Baker, Región de Aysén, Chile.
Provedor de dados: 72
Autores: Vergara,Olivia; Jerez,Viviane.
En la Región de Aysén, Chile, Nothofagus antarctica (ñirre) forma bosques puros de tipo achaparrado y matorrales que corresponden a bosques mixtos secundarios de tipo arbustivo originados por acción antrópica. Este trabajo caracteriza la fauna de insectos e infestaciones asociadas al follaje de ñirre, en las coberturas vegetacionales bosque achaparrado y matorral presentes en la cuenca del río Baker. Los insectos de follaje fueron recolectados en primavera (octubre 2006) y verano (enero 2007), en cinco bosques achaparrados y 10 matorrales entre los 47°2' S - 72°48' W y los 47°15' S - 73° W. Identificamos seis órdenes de insectos, de los cuales Coleóptera fue el más diverso y donde el gremio de fitófagos fue el más representativo para ambas coberturas y...
Tipo: Journal article
Palavras-chave: Bosque achaparrado; Matorral; Ñirre; Diversidad taxonómica.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200002

PRIMER HALLAZGO DE Myxine circifrons Garman 1899 (AGNATHA: MYXINIDAE) EN LA COSTA DEL PACÍFICO DE COLOMBIA
Provedor de dados: 72
Autores: Rubio,Efraín A.; Pedraza,Milton J.; Zapata,Luis A.
Los peces bruja Myxine circifrons Garman 1899 habitan sobre fondos fangosos en la zona preabisal, capturándose principalmente entre los 500 y 1.500 m de profundidad; su distribución geográfica está ligada a las regiones sub-tropicales prefiriendo aguas relativamente frías. Este trabajo registra por primera vez en aguas del océano Pacífico colombiano a 700 m de profundidad la presencia de los agnathos vivientes más primitivos en los océanos del mundo
Tipo: Journal article
Palavras-chave: Primer registro; Myxine circifrons; Pacífico colombiano.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100013

MODES OF INTERANNUAL VARIABILITY OF OCEANIC EVAPORATION OBSERVED FROM GSSTF2
Provedor de dados: 72
Autores: Chiu,Long S; Xing,Yukun.
Variations of the oceanic evaporation are examined using Goddard Satellite Surface Turbulence Flux version 2 (GSSTF2) data. An Empirical Orthogonal Function (EOF) analysis shows that the first non-seasonal EOF, which explains 9.2% of the variance, is characterized by large changes in the subtropical oceanic dry regions, accompanied by small negative changes in the equatorial warm pool and the eastern equatorial Pacific. The time series shows an increasing trend with decadal time scale that started around 1990. This pattern is interpreted as an enhancement of the Hadley and Walker circulation. The second EOF, explaining 5.7% of the variance, is characterized by an equatorial east-west and a mid ocean north-south dipole in the Pacific. The second pattern is...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200021

IDENTIFICACION DE TRES ESPECIES DEL GENERO SQUATINA (CHONDRICHTHYES, SQUATINIDAE) EN LA ZONA COMUN DE PESCA ARGENTINO-URUGUAYA (ZCPAU)
Provedor de dados: 72
Autores: Milessi,Andrés; Vögler,Rodolfo; Bazzino,Gastón.
Hasta el presente no existía una correcta identificación de las especies de Squatina (Dumeril, 1806) en aguas Uruguayas de la Zona Común de Pesca Argentino-Uruguaya (ZCPAU). En dos cruceros de investigación realizados a bordo del B/I "Aldebarán" en octubre de 1995 y abril de 1996, a través de 143 lances efectuados entre 8 y 125 m de profundidad, se registró la presencia de S. guggenheim y de S. argentina, y se identificó por primera vez a S. occulta dentro de la ZCPAU. La separación de las especies se realizó según los criterios establecidos por &lt;A HREF="#Vooren"&gt;Vooren &amp;amp; Da Silva (1991)&lt;/A&gt; a través de la utilización de los siguientes caracteres morfológicos externos: presencia o ausencia de una fila medio-dorsal de espinas; forma y...
Tipo: Journal article
Palavras-chave: Chondrichthyes; Squatina; Zona Común de Pesca Argentino-Uruguaya.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200008

Reducción de selenito a Selenio elemental por Pantoea agglomerans
Provedor de dados: 72
Autores: DAZA,CARLA; CAMPOS,VICTOR L.; ROJAS,CLAUDIO; RODRÍGUEZ-LLAMAZARES,SADDYS; SMITH,CARLOS T.; MONDACA,MARÍA A.
El selenio es esencial y requerido por distintos sistemas biológicos para su crecimiento y metabolismo. Su transformación en el ambiente ocurre principalmente por microorganismos que reducen el selenito a selenio elemental. Pantoea agglomerans UC-32 reduce el selenito a nanopartículas de selenio elemental. El objetivo de este trabajo fue determinar la cinética de reducción de selenito a selenio elemental y la ubicación celular de la actividad reductora en Pantoea agglomerans UC-32. Se ensayó la actividad reductora de P. agglomerans frente a diferentes concentraciones de selenito, evaluándose la disminución de selenito y aparición de selenio elemental. La ubicación de la actividad reductora fue estudiada por fraccionamiento celular y zimograma. Al ensayar...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100008

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

REMOTE SENSING OF SEA SURFACE SALINITY: A CASE STUDY IN THE BURDEKIN RIVER, NORTH-EASTERN AUSTRALIA
Provedor de dados: 72
Autores: Heron,M.L; Prytz,A; Stieglitz,T; Burrage,D.M.
The principles of remotely sensing sea surface salinity are briefly reviewed. The airborne instrument used for this study is a Scanning Low Frequency Microwave Radiometer (SLFMR). It has spatial resolution of typically 500m (depending on the altitude of the aircraft) and a salinity resolution of about 1 psu. This configuration is suitable for studying the dynamics of river plumes as they form on the continental shelf. The Burdekin River is one of Australia's major rivers with about 2.4% of the annual runoff from the continent. This river is in the dry tropics and has severe transient peaks which last for days to weeks during the summer monsoon season. The case study shows the river plume during growth and decay phases and is supported with in situ vertical...
Tipo: Journal article
Palavras-chave: Salinity; Microwave radiometer; Airborne; Remote sensing; River plume; Burdekin River.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200050

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

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

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

Overview and challenges of Marine Biodiversity Research in Peru
Provedor de dados: 72
Autores: Tarazona,Juan; Gutiérrez,Dimitri; Paredes,Carlos; Indacochea,Aldo.
This paper is a panoramic, though incomplete, review of the Peruvian marine biodiversity, including the Peruvian coastal upwelling ecosystem, the marine shallow areas of the Peruvian coast and the mangrove ecosystem of the north of Peru. It includes an analysis of the advances in conservation and management, as well as of research resources. The analysis mainly showed the insufficient human resources and the limited facilities in laboratories and coastal research stations. An analysis was also made from the current unknowns of the research at taxonomy and ecosystem levels, indicating scarce studies for most of the taxonomic groups and biological communities. Finally, the consultations and discussions promoted with the scientific community, allowed the...
Tipo: Journal article
Palavras-chave: Coastal upwelling ecosystem; Marine shallow areas; Mangrove ecosystem of the north; Conservation and management.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200009

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

PROBLEMA EN EL NUMERO DE PARCHES DE CIRROS NUCALES EN PECES DEL GENERO CALLICLINUS GILL 1860 (OSTEICHTHYES, LABRISOMIDAE)
Provedor de dados: 72
Autores: Pequeño R.,Germán; Sáez B.,Sylvia.
La existencia de peces del género Calliclinus con menos de tres parches de cirros nucales genera problemas sistemáticos y taxonómicos, especialmente confusión con el género Auchenionchus Gill, uno de cuyos caracteres diagnósticos indica dos parches. Se analiza el problema con 543 ejemplares y se concluye que pese a este problema, los taxa descritos son válidos
Tipo: Journal article
Palavras-chave: Labrisomidae; Calliclinus; Cirros nucales; Taxonomía.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100019

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

PATRONES DE DISTRIBUCION ESPACIAL DE LOS MACROINVERTEBRADOS BENTONICOS DE LA CUENCA DEL RIO AYSEN (PATAGONIA CHILENA)
Provedor de dados: 72
Autores: Oyanedel,Alejandra; Valdovinos,Claudio; Azocar,Marysol; Moya,Carolina; Mancilla,Gabriela; Pedreros,Pablo; Figueroa,Ricardo.
Se estudiaron las comunidades de macroinvertebrados bentónicos de la cuenca hidrográfica del río Aysén (44°45' -46°15'S; 71°00' - 73°00'W). Semuestreó en 14 estaciones que se distribuyeron en las diferentes subcuencas intentado cubrir la mayor variabilidad del paisaje fluvial. Los muéstreos de macroinvertebrados se realizaron empleando una red Surber. En cada sitio se cuantificaron parámetros fisico-químicos de la columna de agua (pH, conductividad eléctrica, sólidos disueltos, temperatura y oxígeno disuelto), además de parámetros físicos del río (orden del río, pendiente, ancho, profundidad media, velocidad media, tipología de la vegetación ribereña y substrato). Se identificó un total de 59 taxa, la mayor parte de los cuales correspondió a estados...
Tipo: Journal article
Palavras-chave: Macroinvertebrados bentónicos; Habitat fluvial; Número de Froude; Ríos patagónicos; Cuenca del río Aysén.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200011

MAPPING OIL SPILLS IN THE CASPIAN SEA USING ERS-1/ERS-2 SAR IMAGE QUICK-LOOKS AND GIS
Provedor de dados: 72
Autores: Ivanov,Andrei Yu; Ermoshkin,Ivan S.
This application study highlights the potential of the synthetic aperture radar (SAR) imagery for regional oil pollution mapping. The paper presents an approach and methodology for oil spill mapping in the Caspian Sea based on analysis of the ERS-1/ERS-2 SAR image quick-looks; this image seta has been collected in May 1996. By using expert evaluation all oil spill candidates on the SAR images have been detected, analyzed and finally introduced into geographical information system (GIS). GIS consisting of layers (databases) including coastal line, oil production infrastructure, hydrography, currents, bathymetry, allowed, first, to create oil spill distribution map and, second, to define oil spill accumulations and outline risk areas. Detected oil slicks...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200054

FOREWORD
Provedor de dados: 72
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300001

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

Feeding habits and people&amp;#8217;s perception of the Barn Owl ( Tyto alba tuidara , J.E.Gray 1829) in urban settings of Southern Chile: Implications for conservation
Provedor de dados: 72
Autores: Godoy-Güinao,Javier; Díaz,Iván A.; Llanos-Pineda,Manuel; Alò,Dominique.
ABSTRACT People&amp;#8217;s perception on birds of prey is heavily influenced by its intrinsic value, utility, myths and superstitions. In particular, negative perceptions may encourage poaching and persecution of these birds, affecting their conservation status. One nocturnal raptor species widely distributed across the world is the Barn Owl (Tyto alba, Tytonidae). In Chile, this species has been recorded and studied exclusively in rural and sub-urban areas. However, in the city of Valdivia Barn owls exist within the city boundaries. In this study we documented the feeding habits of Barn owls nesting in urban settings of Valdivia, and we analyze the opinions of local neighbors toward the owls. To characterize the diet of owls, we collected all pellets...
Tipo: Journal article
Palavras-chave: Environmental education; Oligoryzomys longicaudatus; Raptors; Urban ecology; Urban wildlife.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382017000100009

VARIABILIDAD ESPACIO TEMPORAL DE LA DERIVA DE LOS VIENTOS OESTES MEDIANTE VIENTOS SATELITALES (QUIKSCAT)
Provedor de dados: 72
Autores: Pardo Márquez,Tamara; Soto Mardones,Luis.
Mediante el uso de 110 imágenes mensuales (1999-2008) del esfuerzo del viento proveniente del satélite Quikscat se analizó la zona donde divergen los vientos hacia el ecuador y hacia los polos. En las cercanías del borde oriental del Pacífico, tanto para el norte como para el sur, se estudió el desplazamiento de las zonas de divergencia de los vientos (DZD) mediante una serie de tiempo versus posición. Mediante análisis estadístico se encontró que el DZD está influenciado por señales de alta frecuencia (periodo de 3 meses), estacional (periodo de 12 meses) e interanual (periodos superior a dos años) asociado al evento cálido de El Niño. La señal más robusta de la serie es la estacional, mostrando que el DZD de la región norte está fuertemente acoplado a la...
Tipo: Journal article
Palavras-chave: Estacional; Desplazamiento; Divergencia; Interanual; Vientos.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100014

MORFOMETRIA, PROPORCION SEXUAL Y SELECTIVIDAD A CONCHILLAS DE GASTEROPODOS DE TRES ESPECIES SIMPATRICAS DE CANGREJOS ERMITAÑOS PAGURUS (DECAPODA. ANOMURA, PAGURIDAE) EN LA BAHIA DE ANCON, LIMA, PERU
Provedor de dados: 72
Autores: Iannacone,José; Alvariño,Lorena.
Los cangrejos "ermitaños" estudiados del género Pagurus (Decapoda: Anomura: Paguridae) son macroinvertebrados del intermareal rocoso marino de la costa central del Perú. Se evaluaron quincenalmente, desde agosto a octubre del 2000 (invierno-primavera) tres especies: Pagurus villosus (Nicolet, 1849), P. edwardsi (Dana, 1852) y P. perlatus (H. Milne Edwards 1848) recolectados en las playas San Francisco (PSF) y Los Enanos (PLE), de la Bahía de Ancón (11° 44,5' LS, 77°6' LW), Lima, Perú, parámetros morfométricos, proporción sexual y de selectividad a conchillas de gasterópodos. Sólo P. perlatus, de PLE, se apartó de la proporción sexual 1:1, representando las hembras un 74,46 %. Los cinco parámetros morfométricos están expresados en mm: longitud del...
Tipo: Journal article
Palavras-chave: Cangrejos ermitaños; Pagurus; Perú; Proporción sexual; Relaciones morfométricas; Selectividad.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100015

REPRODUCTION AND DEVELOPMENT OF Dromiciops gliroides (MARSUPIALIA: MICROBIOTHERIIDAE) IN TEMPERATE RAINFORESTS OF SOUTHERN CHILE
Provedor de dados: 72
Autores: Muñoz-Pedreros,Andrés; Lang,Brian K; Bretos,Marta; Meserve,Peter L.
The reproductive biology of Dromiciops gliroides is described from five females collected during spring (October, December 1984) in southern continental Chile. Developmental morphology of intra-uterine embryos (October litters) was examined by microscopic analysis and compared with morphological attributes of 8 pouched young (December litters). Intra-uterine embryos demonstrate ontogenetic features characteristic of altricial neonates, which migrate from the urogenital opening to the marsupium in order to complete the later stages of development. D. gliroides apparently is a monoestrus, seasonal breeder producing one litter per year. Maximum recorded litter size is four, with birth occurring in early spring (October). The life cycle of D. gliroides is...
Tipo: Journal article
Palavras-chave: Dromiciops gliroides; Embryogenesis; Reproductive biology.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200002

Hábitos alimenticios de larvas de Polycentropus joergenseni Ulmer, 1909 (Trichoptera: Polycentropodidae) en el río Grande (San Luis, Argentina)
Provedor de dados: 72
Autores: Gil,M.A; Garelis,P.A; Vallania,E.A.
El estudio de los hábitos alimenticios de insectos acuáticos en arroyos de bajo orden en Argentina es escaso y fragmentario. Los objetivos de este trabajo fueron determinar el hábito alimentario de estadios larvales de Polycentropus joergenseni mediante el análisis del contenido estomacal y establecer diferencias entre los períodos de aguas altas y bajas en el Río Grande. Se colectaron 51 larvas con red Surber de 0,09 m² y 300 mm de apertura de malla. El material entomológico fue fijado con formalina al 4 % y alcohol al 70 %. El contenido estomacal fue analizado bajo microscopio con aumento de 625 X. Se reconocieron once categorías alimenticias y se calculó el porcentaje de cada uno. El análisis de la dieta no mostró diferencia significativa entre aguas...
Tipo: Journal article
Palavras-chave: Trichoptera; Polycentropus joergenseni; Grupos funcionales alimenticios; Argentina.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200007

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

MULTI-ANGULAR MEASUREMENTS OF SEA-SURFACE POLARIZED MICROWAVE EMISSION CARRIED OUT DURING A SERIES OF GROUND-BASED EXPERIMENTS
Provedor de dados: 72
Autores: Pospelov,Michael N.; Kuzmin,Alexey V.
The results of sea-surface microwave brightness measurements carried out from a pier in 1999-2002 are presented. The measurements were performed by W-band microwave radiometer (wavelengths of 0.3 cm), and Ka-band radiometer-polarimeter (wavelength of 0.8 cm). All equipment was installed on a pier (200 meters long) at 3 meters over the surface; the sea depth at the site was approximately 8 meters. The microwave instruments were mounted on a rotating/scanning platform, which permitted measurements at angles from 10 up to 170 degrees off nadir over 300 degrees range of azimuthal angles. The measurements were carried out 24 hours a day under various meteorological conditions. Microwave brightness dependence on surface wind was studied over wide range of...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300031

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

SATELLITE BATHYMETRY USE IN NUMERICAL MODELS OF OCEAN THERMAL STRESS
Provedor de dados: 72
Autores: Heron,S.F; Skirving,W.J.
Techniques for deriving estimated bathymetry from satellite data are well established; however, use of this product in complex terrains is limited. Accurate bathymetry is essential in the construction of hydrodynamic models and satellite-derived bathymetry is a strong candidate for use in coastal and shallow waters. A case study of Palau is presented which uses satellite-derived bathymetry as input to a hydrodynamic model. Palau underwent widespread coral bleaching during 1998, thought to be due to thermal stress, and existing satellite products observed anomalous increases in temperature. The numerical model is used to evaluate sea surface temperature patterns during such a bleaching event. Comparisons between the model and thermal indicators derived from...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200051

Microestructura y polimorfismo en valvas recientes de Diplodon chilensis patagonicus (d’Orbigny 1835)
Provedor de dados: 72
Autores: Soldati,Analía L; Jacob,Dorrit E; Bianchi,María M; Hajduk,Adán.
Gracias a su potencial como registro ambiental, las valvas del molusco Diplodon han despertado recientemente el interés de la comunidad científca. En este trabajo, por medio de microscopía electrónica de barrido (SEM) y espectroscopía Raman se investigó la microestructura y el polimorfsmo en valvas recientes de Diplodon chilensis patagonicus. Se encontró que la valva es completamente aragonítica y que la capa nacarada “externa" es la región más favorable para realizar mediciones de isótopos estables o elementos traza. Los análisis de microscopía confocal y SEM realizados demostraron que un incremento anual está compuesto de dos bandas: una de color claro, depositada durante los meses fríos y una de color oscuro, depositada durante los meses cálidos. Ambas...
Tipo: Journal article
Palavras-chave: Valva; Diplodon; Microestructura; Aragonita; Líneas de crecimiento.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100009

SATELLITE FLUORESCENCE AS A MEASURE OF OCEAN SURFACE CHLOROPHYLL
Provedor de dados: 72
Autores: Gower,Jim; King,Stephanie.
Both the MODIS optical sensors on the NASA Aqua and Terra spacecraft and the MERIS instrument on the ESA Envisat measure spectral radiance in bands designed to allow detection of the fluorescence signal from surface chlorophyll in sea water, stimulated by ambient sun and sky light. We present images of fluorescence as derived from the level 1 MERIS data and compare the signal levels of the fluorescence with measurements of extracted chlorophyll from research cruises during 2002 to 2004, with satellite estimates of chlorophyll from the blue to green ratio observed by MERIS, and with fluorescence measurements made by MODIS. We show that the fluorescence signal is consistent between MERIS and MODIS, and that relation between fluorescence and chlorophyll...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200045

Notas sobre protozoos ciliados dulceacuícolas de Chile
Provedor de dados: 72
Autores: Woelfl,Stefan.
En este trabajo se revisa el estado de conocimientos sobre protozoos ciliados de aguas continentales en Chile. Por falta de especialistas, existen muy pocos estudios sobre la taxonomía, distribución geográfica y ecología de ciliados chilenos. Registros recientes existen solamente para los lagos araucanos, entre los cuales se describió Stentor araucanus, una especies endémica de Chile y Argentina. Se discuten problemas taxonómicos y se entregan detalles sobre la distribución de los géneros Stentor y Ophrydium en los lagos chilenos
Tipo: Journal article
Palavras-chave: Ciliados; Biodiversidad; Taxonomía; Lagos chilenos.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100005

Juvenile production of the reshwater prawn Cryphiops caementarius (Decapoda: Palaemonidae) under laboratory conditions in Coquimbo, Chile
Provedor de dados: 72
Autores: Meruane,Jaime; Rivera,Miguel; Morales,Cristina; Galleguillos,César; Hosokawa,Hidetsuyo.
Two culture experiments from 1995 until 1997 were carried out with larvae obtained from gravid females of Cryphiops caementarius (Molina 1782), to define a methodology in order to produce juvenile using controlled conditions of water temperature, salinity and feeding. Time in culture of larval development and the survival rate were determined. Two distinct types of culture systems were studied. Both systems incorporated a standard alimentation using nauplius of Artemia sp. plus microalgae; however the second system included, in addition, a supplement of fish and chiken eggs. The decrease in survival rate in both cultures systems was related to morphological changes in each stage of development. Juveniles were obtained after 98 days of culture with the...
Tipo: Journal article
Palavras-chave: Chile; Freshwater prawn; Larvae; Culture technology; Metamorphosis; Juvenile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200010

LYNNYELLA, A NEW GENUS OF CLICK BEETLES FROM CENTRAL AND SOUTHERN CHILE (COLEOPTERA: ELATERIDAE)
Provedor de dados: 72
Autores: Arias,Elizabeth T.
The new genus Lynnyella is here described. The type species for the genus Lynnyella is Deromecus suturalis (&lt;A HREF="#Candeze"&gt;Candèze 1865&lt;/A&gt;). The new genus Lynnyella belongs to the tribe Pomachiliini and includes: L. suturalis (&lt;A HREF="#Candeze"&gt;Candèze 1865&lt;/A&gt;) n. comb., L. concepcionensis Arias n. sp., L. diegoi Arias n. sp., L. gerhardtae Arias n. sp., L. juanjoseorum Arias n. sp., L. longaviensis Arias n. sp., and L. valenciai Arias n. sp. The genus Lynnyella is distributed in Central and Southern Chile. The geographic distributions of these species are mapped and a key is provided
Tipo: Journal article
Palavras-chave: Deromecus suturalis; Lynnyella; Pomachiliini; Elaterinae; Elateridae.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200005

MONITOR SPATIAL AND TEMPORAL PATTERNS OF SUSPENDED SEDIMENTS IN THE EAST CHINA AND YELLOW SEAS USING SEAWIFS DATA
Provedor de dados: 72
Autores: Hyung Ryu,Joo; Hwan Ahn,Yu; Shanmugam,P.
Striking patterns of suspended sediments created by a complex interplay of physical, chemical, biological and geological processes in the East China Sea (ECS) and Yellow Sea (YS) have been investigated using SeaWiFS ocean color imagery. The structure of these patterns can reveal a great deal about the processes underlying their formation. Sea surface temperature (SST) analyzed from the Advanced Very High Resolution Radiometer (AVHRR) thermal infrared data and in-situ were used to elucidate the physical factors responsible for the evolution of such patterns in the inner and outer selves areas, whilst concomitant patterns of suspended sediment were tracked from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) ocean color imagery. A careful analysis of...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300036

FIRST RECORD OF SOME PERITRICHS CILIATES FOR SAN MIGUEL DEL MONTE POND (BUENOS AIRES, ARGENTINA)
Provedor de dados: 72
Autores: Zaleski,M.; Claps,C.
Peritrichs attached to submerged macrophytes, filamentous chlorophytes and debries have been found in San Miguel del Monte pond (Buenos Aires province, Argentina) during the period March 1998- March 1999. Specimens were identified, illustrated and measured alive. Fourteen species of Subclass Peritrichia new for the country are described, illustrated and commented: Epistylis hentscheli, E. tubificis, E. vestita, Opercularia elongata, Cothurnia annulata, Cothurniopsis valvata, Pyxicola limbata, Thuricola innixa, Th. kellicotiana, Vaginicola attenuata, Vorticella picta, V. pulchella, V. rotunda and Zoothamnium ramosissimum
Tipo: Journal article
Palavras-chave: Ciliates; Peritrichs; First record; Pampasic pond; San Miguel del Monte; Argentina.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000100007

LISTA PRELIMINAR DE FORMICIDOS (INSECTA: HYMENOPTERA) DEL PARQUE NACIONAL SIERRA DE LAS QUIJADAS (SAN LUIS, ARGENTINA)
Provedor de dados: 72
Autores: García,M.; Quirán,E. M.
RESUMEN En la presente nota se realizó un relevamiento de las hormigas del Parque Nacional de las Quijadas (32&amp;deg; 22` a 32&amp;deg;47`S y 67&amp;deg;10` a 66&amp;deg;58`W), San Luis, Argentina. Los resultados arrojaron 10 registros nuevos para esta provincia: Acromyrmex striatus Roger 1863, Crematogaster jheringi Emery 1908, Pogonomyrmex odoratus Kusnezov 1949; P. abdominalis Santschi 1929; P. lobatus Santschi 1921; Solenopsis saevissima (Fr.Smith 1855); S. interrupta Santschi 1916; Forelius breviscapus Forel 1931; Dorymyrmex wolffhuegeli Forel 1911 y Linephitema humile Mayr 1868
Tipo: Journal article
Palavras-chave: Hormigas; Formicidae; Inventario; Lista de especies; Argentina; San Luis.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100013

OCEANOGRAPHIC AND ACOUSTIC MEASUREMENTS IN DRAKE PASSAGE
Provedor de dados: 72
Autores: Baqués,Michèle; Blanc,Silvia.
On December 2001 the Argentinean Naval Service of Research and Development participated in the LMG01-9 expedition to Antarctic Peninsula, which was part of the Antarctic Program of the National Science Foundation of the USA for 2001. The inclusion of a SENID researcher, in the role of scientific national observer, on board the icebreaker R/V Lawrence M. Gould enabled our institute access to additional at-sea measurements. The main purposes of the expedition were primarily focused in two research projects from foreign institutes which were out of the scope of local interests. However, in-situ measurements led also to valuable information on temperature, salinity, bathymetry, vectorial current velocity obtained with an Acoustic Doppler Current Profiler...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200005

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

ESTIMATION OF ONSHORE-OFFSHORE TRASPORT OFF CENTRAL CHILE BY MEANS OF MAXIMUN CROSS-CORRELATION USING SATELLITE DERIVED SST
Provedor de dados: 72
Autores: Navarro,Eduardo; Schneider,Wolfgang; Letelier,Jaime.
Between December 2001 and February 2002, NOAA-AVHRR images were obtained twice a day for the region between 30-40S and 70-80W. Within the cloud free areas, sea surface temperature was calculated according to standard split window algorithms. The geo-referenced horizontal resolution for each SST-pixel resulted in 2 km, in east-west and north-south direction. All pairs of images were analyzed with respect to advective surface velocity by means of Maximum Cross-Correlation. Maximum Cross-Correlations exceeding the predetermined significance level of cross correlation were accepted. From all pairs of comparison monthly advective velocity maps (and SST maps) were constructed and separated in a coastal and offshore band. Coastal upwelling was observed along the...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300020

THE SPHINGIDAE OF BOLIVIA (INSECTA: LEPIDOPTERA)
Provedor de dados: 72
Autores: Kitching,Ian J.; Ledezma,Julieta; Baixeras,Joaquín.
An annotated checklist of the Sphingidae (hawkmoths) of Bolivia is presented. A total of 189 species and subspecies are confirmed. Locality data derived from specimens in the collections of the Department of Entomology of the Natural History Museum Noel Kempff Mercado of Santa Cruz de la Sierra; the Bolivian Collection of Fauna, La Paz; The Natural History Museum, London; and the Carnegie Museum of Natural History, Pittsburgh, are given. A map of these localities and a synoptic discussion of their geography and ecology are also provided. Data on species not represented in these collections are collated from the publications of J. Haxaire and D. Herbin and presented. Diagnostic features to enable identification of a number of closely related species pairs...
Tipo: Journal article
Palavras-chave: Bolivia; Sphingidae; Hawkmoth; Checklist; Fauna.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200001

Los poros precloacales como diferenciadores de sexo en Liolaemus (Squamata: Liolaemidae): el caso de L. jamesi (Boulenger, 1891)
Provedor de dados: 72
Autores: RUIZ DE GAMBOA,MARGARITA; ORTIZ-ZAPATA,JUAN C.
La presencia de poros precloacales se utiliza con frecuencia en Liolaemus para diferenciar a machos de hembras. Actualmente este carácter es confuso en Liolaemus jamesi porque se ha descrito la presencia y ausencia de poros en las hembras. En este trabajo se confirmó que tanto machos como hembras de L. jamesi poseen poros precloacales.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100012

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

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

VARIACION DE LA DENSIDAD POBLACIONAL DE SMINTHURUS VIRIDIS (L.) (COLLEMBOLA: SMINTHURIDAE) EN LA IX REGION DE LA ARAUCANIA, CHILE
Provedor de dados: 72
Autores: Klein,Carlos; Rebolledo,Ramón; Cerda,Claudia; Aguilera,Alfonso.
La "pulga saltona" o "colémbolo de la alfalfa" S. viridis (L.) es una plaga secundaria de reciente introducción a Chile que alcanzado cierta importancia en praderas de alfalfa en la zona centro-sur del país. El estudio se llevó a cabo en alfalfares de la ex estación experimental Maipo de la Universidad de La Frontera en la zona agroecológica del llano central y en el INIA Carillanca correspondiente a la precordillera. En ambas zonas se realizó un muestreo cada 15 días con red entomológica durante el período de junio de 1996 a marzo de 1997 con el objetivo de determinar la fluctuación poblacional, además de sus eventuales enemigos naturales. Los resultados demuestran que la población fue muy baja en el llano central de octubre a marzo y se mantuvo baja en...
Tipo: Journal article
Palavras-chave: Sminthurus viridis; Fluctuación poblacional; Nabis punctipennis; La Araucanía; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200006

ESTRUCTURA DE LA MACROFAUNA EN AMBIENTES OXICOS DE BAHIA COLIUMO, REGION DEL BIO-BIO, CHILE CENTRAL
Provedor de dados: 72
Autores: Neira,Karina; Palma,Maritza.
Se analizó la densidad, biomasa, diversidad y riqueza de especies de la macrofauna bentónica (³500 mm) en ambientes óxicos (&gt; 0.5 ml L-1) en Bahía Coliumo (36º32`S, 72º57`W), Chile central. En un transecto de cinco estaciones, entre 3,6 y 22,5 m de profundidad, fueron recolectadas muestras de sedimento con una draga tipo Van veen de 0,051 m², a bordo de la embarcación científica L/C Kay-Kay. A partir de las muestras de sedimento se determinó, el porcentaje de materia orgánica total, el tamaño de grano, densidad y biomasa de la macrofauna. Adicionalmente, se tomaron muestras de agua para el análisis de oxígeno disuelto de fondo, temperatura y salinidad. Las densidades de la macrofauna total fluctuaron entre 1111 y 11183 ind m-2. En tanto, los valores de...
Tipo: Journal article
Palavras-chave: Bentos marino; Diversidad; Factores ambientales.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200004

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

EL PEZ MESOPELAGICO CENTROLOPHUS NIGER (GMELIN, 1789) (PISCES: PERCIFORMES) Y SU HALLAZGO EN AGUAS DEL TALUD CONTINENTAL CHILENO SITUADAS SOBRE LA PLACA SUDAMERICANA
Provedor de dados: 72
Autores: Reyes,Pablo; Hüne,Mathias; Ruiz,Víctor H.
Se estudió un ejemplar de Centrolophus niger (Gmelin, 1789) (Perciformes: Centrolophidae), capturado como fauna acompañante en faenas de pesca de ``besugo'' Epigonus crassicaudus de Buen, 1959 el 14 de octubre del año 2003 frente a la provincia de Valdivia (39º04'S; 73º57'W) a una profundidad de 400 m, mediante pesca de arrastre de media agua. Este constituye el primer registro para la especie en aguas del talud continental chileno situadas sobre la Placa Sudamericana.
Tipo: Journal article
Palavras-chave: Arrastre de media agua; Fauna acompañante; Centrolophidae; Ictiofauna chilena; Chile.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100010

KARYOTYPE STUDY IN THE SURF CLAM MESODESMA DONACIUM LAMARCK, 1818 (BIVALVIA: VENEROIDA: MESODESMATIDAE)
Provedor de dados: 72
Autores: Amar,Gabriel; Palma Rojas,Claudio; von Brand,Elisabeth; Jara-Seguel,Pedro.
Mesodesma donacium is a marine clam distributed from Sechura Bay (5°S) in northern Perú to Chiloé Island (43ºS) in southern Chile. Due to the commercial importance of this species, their populations have been reduced in the later years. In this work the karyotype morphology of M. donacium is described for the first time, to be additional to taxonomical, ecological, morphological, and reproductive antecedents previously documented for the species. M. donacium shows a diploid karyotype 2n = 38 with one metacentric, fifteen submetacentric and three subtelocentric chromosome pairs. The total haploid set length was 42.4 mm, and the mean chromosome size was 2.2 mm. M. donacium showed similitude in chromosome number with other species of the Veneroida order, but...
Tipo: Journal article
Palavras-chave: Veneroida; Mesodesmatidae; Cytogenetic relationshipt; Chromosomes; Karyotype morphology.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100003

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

OBITUARIO
Provedor de dados: 72
Autores: RUIZ R.,VÍCTOR H.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200010

ESTADO ACTUAL DEL CONOCIMIENTO DE LAS GARRAPATAS (ACARI: IXODIDA) ASOCIADAS A CANIS FAMILIARIS L.
Provedor de dados: 72
Autores: Muñoz,Lisandro E; Casanueva,María E.
El presente trabajo es una revisión bibliográfica que recopila antecedentes sobre las 58 especies de Ixodida que pueden parasitar al perro (Canis familiaris) a nivel mundial, y se incluye para cada especie su distribución geográfica, hospedadores, ubicación en el hospedador, actividad estacional, ciclo de vida y enfermedades transmitidas
Tipo: Journal article
Palavras-chave: Garrapatas; Ixodida; Perros.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200011

REPTILES EN EL MONUMENTO NATURAL EL MORADO (REGION METROPOLITANA, CHILE): ABUNDANCIA RELATIVA, DISTRIBUCION ALTITUDINAL Y PREFERENCIA POR ROCAS DE DISTINTO TAMAÑO
Provedor de dados: 72
Autores: Mella,Jorge E.
En este estudio se caracterizó la fauna de reptiles presentes en el Monumento Natural El Morado, Región Metropolitana, Chile. Se encontraron seis especies (cuatro lagartijas y dos culebras), cuyas abundancias fueron: Liolaemus moradoensis (40,9%), L. nigroviridis (37,7%), L. valdesianus (17,1%), L. nitidus (2,7%), Tachymenis chilensis (1,2%) y Philodryas chamissonis (0,4%). A pesar del estrecho rango altitudinal estudiado (cerca de 600 m), las distintas especies presentaron diferentes patrones de distribución: L. nitidus se encontró sólo en el piso altitudinal más bajo (menor a 1.900 msnm), mientras que L. moradoensis y L. valdesianus se encuentran sobre los 2.150 msnm (alcanzando esta última especie los 2.450 msnm, con lo que se amplía el rango...
Tipo: Journal article
Palavras-chave: Reptiles saxicolas; Liolaemus; Preferencia por rocas; Nicho; Chile central.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100003

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

New record of Cuspidaria patagonica Smith, 1885 (Bivalvia: Cuspidariidae) in northern Chile
Provedor de dados: 72
Autores: ARAYA,JUAN FRANCISCO; CATALÁN,RICARDO.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200204

Patrones de desplazamiento de peces nativos en el Río San Pedro (cuenca del Río Valdivia, Chile)
Provedor de dados: 72
Autores: Piedra,Priscila; Habit,Evelyn; Oyanedel,Alejandra; Colin,Nicole; Solis-Lufí,Katherin; González,Jorge; Jara,Alfonso; Ortiz,Néstor; Cifuentes,Roberto.
Los peces nativos chilenos se caracterizan por ser de tamaño pequeño (&lt;30 cm). Por ello, generalmente se les menciona como de baja capacidad de natación y desplazamiento. Sin embargo, no existen estudios empíricos que lo demuestren. En este estudio describimos los patrones de movimiento de seis especies nativas en el río San Pedro (Aplochiton taeniatus, Galaxias maculatus, Galaxias platei, Diplomystes camposensis, Basilichthys australis, Percilia gillissi y Percichthys trucha), utilizando técnicas de marcaje-recaptura mediante pinturas elastoméricas y Pit-tags. Nuestros resultados sugieren que la mayor parte de las especies presentan desplazamientos pasivos, recorriendo distancias de hasta aproximadamente 40 km en el sentido de la corriente. También...
Tipo: Journal article
Palavras-chave: Peces nativos; Desplazamiento; Marcaje-recaptura; Pit-tags; Chile.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100006

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

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

Vigencia del Darwinismo
Provedor de dados: 72
Autores: Lessa,Enrique P.
En este ensayo se presenta una revisión histórica del signifcado y legado del darwinismo, con énfasis en el último siglo. La principal conclusión es que la visión darwiniana de la evolución, con las modifcaciones requeridas para dar cuenta de los grandes desarrollos de la disciplina, se ha impuesto y mantiene vigencia en nuestros días. En particular, el papel del azar, la evolución como proceso de “descendencia con modifcación” a lo largo de diversas ramas del árbol de la vida, el pensamiento poblacional, el gradualismo y la selección natural son los principales legados de la obra de Darwin. En el caso de la selección, entendida como proceso poblacional de naturaleza estocástica, se propone que la visión de su papel ha sufrido dos procesos de expansión a...
Tipo: Journal article
Palavras-chave: Evolucionismo moderno; Neodarwinismo; Neutralismo; Teoría de la selección; Unidades de selección.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000300007

Marine biodiversity in Colombia: Achievements, status of knowledge, and challenges
Provedor de dados: 72
Autores: Díaz,Juan M; Acero,Arturo.
Colombia is recognized as a megadiverse country on the basis of the number of terrestrial animal and plant species occurring within its boundaries. However, due to the circumstance that it possesses coasts on both the Caribbean Sea and the Pacific Ocean, each of them exhibiting distinct geological, oceanographic, and climatic features, Colombia is perhaps the country with the highest marine biological diversity in South America and one of the most biodiverse in the New World. Although scientific research concerning marine biodiversity of Colombia has a very short history, considerable knowledge has been achieved in the last 10 years, particularly in regard to species inventories and ecosystem characterizations, including thematic mapping. Relatively...
Tipo: Journal article
Palavras-chave: Marine biodiversity; Colombia; Caribbean; Eastern Pacific; Marine ecosystems.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200011

SATELLITE SURFACE TO TROPOSPHERE WIND MEASUREMENTS
Provedor de dados: 72
Autores: Brown,Robert A.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200012

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

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

PRIMER REGISTRO DE ABUNDANCIA VIRAL EN BAHIA COLIUMO Y PLATAFORMA CONTINENTAL FRENTE A CHILE CENTRAL
Provedor de dados: 72
Autores: Chiang,Oscar E; Middelboe,Mathias; Quiñones,Renato A.
The abundance of virus like particles (VLP) was determined for the first time in the water column and sediment of Coliumo Bay and on a station on the continental shelf off central Chile. The VLP decreases with depth in the water column with a surface maximum of 4.1 x 10(7) VLP mL-1 and 5.87 x 10(7) VLP mL-1 on the shelf and Coliumo Bay, respectively. In the sediments the VLP ranged between 4.28 x 10(8) VLP mL (Coliumo Bay) and 1.01 x 10(8) VLP mL (shelf). The abundance of VLP is higher at the Bay both in the water column and in the sediment.
Tipo: Journal article
Palavras-chave: Viruses; Virus-like particles; Prokaryotes; Humboldt Current System.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100014

RADIOLARIOS (PROTOZOA, ACTINOPODA) SEDIMENTADOS EN EL PUERTO DE CALDERA (27°04' S; 70°51' W), CHILE
Provedor de dados: 72
Autores: Zapata,Jaime; Olivares,Jorge.
Los radiolarios son un grupo de protozoos marinos, silíceos y holoplanctónicos, cuyo desconocimiento es manifiesto en las aguas marinas chilenas. El presente trabajo constituye inventario preliminar, ilustrar y descripción las especies de radiolarios encontradas en 14 muestras de sedimento recolectadas en el Puerto de Caldera, Chile. El número total de especies encontradas en las muestras estudiadas fue de 30, distribuidas en 24 géneros, 8 familias (Actinommidae, Collosphaeridae, Litheliidae, Phacodiscidae, Pterocorythidae, Spongodiscidae, Theoperidae y Tholoniidae) y 2 órdenes (Spumellaria y Nassellaria). La escasez de conocimientos biológicos, zoogeográficos y taxonómicos de los Radiolaria chilenos impide, por el momento, utilizar a estos organismos como...
Tipo: Journal article
Palavras-chave: Radiolarios; Taxonomía.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100009

SPATIAL AND TEMPORAL ANALYSIS OF SEAWIFS CHLOROPHYLL IN THE SOUTH TROPICAL PACIFIC OCEAN
Provedor de dados: 72
Autores: Dupouy,C; Neveux,J; Le Bouteiller,A.
The South West Tropical Pacific (SWTP) is generally considered as an N-limiting oligotrophic area with parts characterized by permanent deep thermocline and nutricline as the Melanesian Archipelago. However, ocean color imagery shows in this region a strong seasonal chlorophyll cycle, with large blooms which have for long been attributed to nitrogen-fixing cyanobacteria as Trichodesmium. SeaWiFS surface chlorophyll analysis of the area between 5°S-25°S, 150°E-170°W has been conducted from 1997 to 2004. A strong seasonal and interannual variability is described, which relates well with the sea-truth measured chlorophyll concentrations. An empirical orthogonal function analysis helped in determining principal explicative factors of this variability, and in...
Tipo: Journal article
Palavras-chave: SeaWiFS; Trichodesmium; South Western Tropical Pacific Ocean; Solomon; New Caledonia; Vanuatu and Fiji-Tonga archipelagos; Statistical EOF analysis; Oceanic nitrogen fixation.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200030

NIVELES DE Cu, Pb Y Zn EN AGUA Y PERUMYTILUS PURPURATUS EN BAHIA SAN JORGE, NORTE DE CHILE
Provedor de dados: 72
Autores: Salamanca,Marco A.; Jara,Bibiana; Rodríguez,Tatiana.
Es un hecho reconocido que la contaminación por metales traza representa uno de los mayores factores de riesgo para los organismos marinos costeros, los que se encuentran expuestos a ellos por efecto de las descargas de efluentes industriales y urbanos en bahías y estuarios, además muchos de estos metales participan en ciclos biológicos de diferentes organismos lo que afecta su distribución y abundancia. Paralelamente, se han realizado varios estudios para evaluar el efecto de los compuestos eliminados por actividades antropogénicas midiendo su concentración en agua, sedimentos y organismos. En este contexto, los bivalvos han sido ampliamente utilizados como indicadores de contaminación de sistemas costeros, ya que por su carácter de organismos sésiles...
Tipo: Journal article
Palavras-chave: Metales pesados; Bivalvos; Agua de mar; Zona costera.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100005

SEASONAL AND MESOSCALE VARIABILITY IN THE PERU UPWELLING SYSTEM FROM IN SITU DATA DURING THE YEARS 2000 TO 2004
Provedor de dados: 72
Autores: Echevin,Vincent; Puillat,Ingrid; Grados,Carmen; Dewitte,Boris.
Historical data from hydrological cruises performed off Peru by Instituto del Mar del Peru (IMARPE) during the years 2000-2004 are described and analysed. Hydrographic conditions commonly encountered are briefly described and contrasted with episodes displaying intense surface or subsurface salinity anomalies, in relation to calm wind conditions in summer, intense upwelling and strong mesoscale activity in winter and spring, as evidenced on sea level and wind data. These data suggest a strong variability at different spatial scales, related to a variety of coastal dynamical processes
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200031

HEMIEUXOA POLYMORPHA FORBES 1933 PRIMER REGISTRO PARA CHILE: ¿RELICTO O DISPERSIÓN? (LEPIDOPTERA, NOCTUIDAE, NOCTUINAE)
Provedor de dados: 72
Autores: Angulo,Andrés O.; Olivares,Tania S.
Se entrega el primer registro del lepidóptero nocturno Hemieuxoa polymorpha Forbes, 1933, para Chile. Adultos han sido recolectados en el sector Alto Patache, Iquique, Chile. Se mencionan las diferencias con la especie más próxima H. conchidia Butler
Tipo: Journal article
Palavras-chave: Lepidoptera; Noctuidae; Noctuinae; Alto Patache; Iquique; Chile; Nuevo registro.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100016

FAUNA ICTICA ASOCIADA A LA PESQUERIA DE PEZ ESPADA (XIPHIAS GLADIUS LINNAEUS)
Provedor de dados: 72
Autores: Acuña,Enzo; Villarroel,Juan C.; Grau,Rodrigo.
Se entrega información sobre la fauna acompañante capturada durante faenas de pesca de pez espada realizadas por dos naves, una artesanal y una industrial, entre noviembre del 2000 y septiembre del 2001. Ambas naves operaron dentro y fuera de la Zona Económica Exclusiva (ZEE), entre los 24°07'S y 37°13'S frente a la costa chilena. En cada lance de pesca las especies fueron identificadas, contadas y medidas sus longitudes. Se registró la presencia de seis especies de condrictios (cinco tiburones y una raya) y de diez teleósteos, además de la especie objetivo. El porcentaje numérico de las especies encontradas en la fauna acompañante muestra un alto porcentaje de condrictios (72%) con respecto al pez espada (21%), siendo el azulejo (Prionace glauca) la...
Tipo: Journal article
Palavras-chave: Fauna acompañante; Pez espada; Palangre; Tiburones; Conservación; Manejo.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200025

NUEVO GENERO Y DOS ESPECIES NUEVAS DE ANTHICIDAE PARA CHILE (COLEOPTERA)
Provedor de dados: 72
Autores: Moore,Tomás; Vidal,Pedro.
Se describe un nuevo género, Protoanthicus, con dos especies nuevas: P. marziae n. sp. y P. valenciai n. sp. para Chile (Anthicidae, Coleoptera)
Tipo: Journal article
Palavras-chave: Anthicidae; Chile; Taxonomía.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200018

Pelagic Biodiversity and Biogeography around the SouthAmerican continent
Provedor de dados: 72
Autores: Pierrot-Bults,Annelies C.
Biogeography around South America is well documented on the Atlantic side and less well documented on the Pacific side especially south of about 30º S. The South Pacific oceanic areas are the least known of all pelagic areas. The different approaches to determine biogeographic provinces (e.g. the classical one showing mainly latitudinal and watermass distribution patterns based on presence/absence of species; and the biogeochemical approach based on productivity regimes and modelling) are discussed. The latter shows more east-west division. Testing of these concepts will probably reveal more coastal provinces in the Pacific area. The transitional area in the South Pacific is also an interesting area for molecular species research because there are some...
Tipo: Journal article
Palavras-chave: Pelagic biodiversity; Biogeography; South America.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200005

VARIACION ONTOGENETICA EN LA DIETA DE PATAGONOTOTHEN LONGIPES (STEINDACHNER 1876) (PERCIFORMES: NOTOTHENIIDAE) EN EL FIORDO DE CASTRO, CHILOE
Provedor de dados: 72
Autores: Murillo,Carlos; Oyarzún,Ciro.
Patagonotothen longipes es un nototénido litoral que se distribuye geográficamente en Chile, desde Chiloé (42&amp;ordm;29'S, 73&amp;ordm;45'W) al sur. En el presente trabajo se analiza su ecología trófica, para lo cual se estudiaron 105 ejemplares capturados en el Fiordo de Castro (Isla de Chiloé). A cada ejemplar se le registró la longitud total (LT en cm) y el peso (g). El análisis de la información resultante de los contenidos estomacales se realizó por los métodos numérico, gravimétrico, de frecuencia; el coeficiente dietario de Hureau (Q) y el índice de importancia relativa (IIR). La diversidad trófica se analizó por medio de los índices de heterogeneidad de Shannon-Wiener (H') y de equidad de Pielou (J'). La semejanza entre las dietas de diferentes...
Tipo: Journal article
Palavras-chave: Ecología trófica; Nototheniidae; Chiloé.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200018

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

Variación temporal de los afloramientos costeros frente a Chile Central (36°S; 74°W), mediante los isótopos estables de oxígeno de foraminíferos planctónicos, durante El Niño 2006
Provedor de dados: 72
Autores: Gajardo,Nathalie; Marchant,Margarita; Hebbeln,Dierk.
La costa chilena se caracteriza por ser un área muy productiva, donde la costa centro-sur de Chile presenta procesos estacionales de afloramiento costero, convirtiéndola en una zona con aguas ricas en nutrientes. La variación temporal de los eventos de surgencia puede variar en presencia de eventos El Niño, por lo que se decidió caracterizar esta variabilidad durante El Niño 2006 en Concepción a través del estudio de isótopos estables de oxígeno de foraminíferos planctónicos recolectados mediante trampas de sedimentos. Las conchas de foraminíferos pueden registrar variaciones ambientales y es por ello, que se determinó el 5(18)O de Globigerina bulloides d'Orbigny, 1826 y Neogloboquadrina incompta (Cifelli 1961), entre enero y octubre de 2006 a 1.000 y...
Tipo: Journal article
Palavras-chave: Surgencias costeras; ENOS; Isótopos; Globigerina bulloides; Neogloboquadrina incompta.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100002

Mamíferos terrestres de la Región de Atacama, Chile: Comentarios sobre su distribución y estado de conservación
Provedor de dados: 72
Autores: Valladares Faúndez,Pablo.
Se presenta una lista comentada de las especies de mamíferos terrestres de la Región de Atacama, Chile. Se analizó su distribución y estado de conservación a partir de datos de terreno, colecciones taxonómicas, literatura científica y reportes técnicos provenientes de instituciones públicas de Atacama. Se ha confirmado confirmado la presencia de 24 especies de mamíferos terrestres para la Región de Atacama, de las cuales el Orden más representativo es Rodentia, con 12 especies (50%), seguido por Carnívora con 5 (20,8%), Chiroptera con 3 (12,5%), Artiodactyla con 2 (8,3%) y Didelphimorphia con 2 (8,3%). Sin embargo, se han mencionado otras 15 especies para Atacama, pero de las cuales no hay evidencias científicas. La determinación del estado de conservación...
Tipo: Journal article
Palavras-chave: Mamíferos de Atacama; Biodiversidad; Conservación; Distribución.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000200003

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

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

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

ON THE CONTRIBUTIONS OF EKMAN TRANSPORT AND PUMPING TO THE DYNAMICS OF COASTAL UPWELLING IN THE SOUTH-EAST PACIFIC
Provedor de dados: 72
Autores: Croquette,Marie; Eldin,Gérard; Echevin,Vincent.
We investigate the oceanic circulation in the South-East Pacific (SEP) and Peru-Chile coastal upwelling, using satellite data and a medium resolution, eddy permitting regional model. The data consist in ERS 1 and 2 derived winds and AVHRR SST. Ekman pumping and transport are first calculated from wind data and analysed. Results are compared to the estimate of the zonal extension of upwelling cells obtained from SST data. The time variability of these parameters confirms that the northern and southern parts of the region have different characteristics. Namely, in the northern part, the seasonal cycles of SST and Ekman pumping are not correlated whereas in the southern part, the Ekman transport, pumping and the zonal extension of SST fluctuations exhibit a...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200025

Living in the oxygen minimum zone: A metabolic perspective
Provedor de dados: 72
Autores: Quiñones,Renato A; González,Rodrigo R; Levipan,Héctor; Gerdhard,Jessen; Gutiérrez,Marcelo H.
Respiration is a key variable to understand the flux of energy and matter in any ecosystem. In fact, ecosystem respiration is a critical component of the carbon cycle and might be important in regulating biosphere response to global climate change. Respiration is the basic process used by the biota to yield energy from the degradation of organic matter for their survival needs, its measurement provides an estimate of the minimum energy needed by the organism. Accordingly, the total respiration of an aquatic community can be equated to the minimum energy needed to maintain its organized living structure and function. Despite its importance, community respiration has been a process scarcely studied in the ocean and only during the 90's has become more...
Tipo: Journal article
Palavras-chave: Anaerobic metabolism; Respiration; Oxygen minimum zone; Humboldt Current system.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300014

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

ENVIRONMENTAL CHARACTERISTICS OF SAN MATÍAS GULF OBTAINED FROM LANDSAT-TM AND ETM+ DATA
Provedor de dados: 72
Autores: Gagliardini,Domingo A; Rivas,Andrés L.
The San Matías Gulf, located between 40 47' S and 42 13' S on the Atlantic coast of South America, with an area of approximately 18 000 km², is the second largest in Argentina. This gulf has been studied by means of historical data obtained in oceanographic campaigns carried out before 1990 and with satellite images of low-resolution (1000 m) NOAA-AVHRR obtained from 1985. The analysis of this information permitted to infer some environmental characteristics related to temperature, salinity, productivity and circulation. The objective of the present work is to analyze LANDSAT-TM and ETM+ data from 1997-2003. Approximately 30 free of clouds images, obtained in different times of the year, were processed. The thermal channel allowed to obtain a detailed...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200034

VARIACION LATITUDINAL Y ESTACIONAL EN LA DIETA DE DISSOSTICHUS ELEGINOIDES SMITT, 1898 (PERCIFORMES: NOTOTHENIIDAE) EN AMBIENTES PROFUNDOS DE LA COSTA CENTRO-SUR DE CHILE
Provedor de dados: 72
Autores: Murillo,Carlos; Oyarzún,Ciro; Fernández,Italo.
Se estudió la dieta de Dissostichus eleginoides, en tres áreas de la costa centro-sur de Chile, entre 36° y 51° S. El análisis de 1583 estómagos, de los cuales el 12,8% presentaron contenido, indicó que su espectro trófico, alcanzó 22 familias y 26 especies animales. Según el IIR, los peces óseos constituyen el 95,6% de la dieta, siendo las familias Macrouridae y Ophidiidae las más importantes que pudieron ser identificadas, representando el 21,1% y 11,2% del IIR respectivamente, con menor importancia aparecen cefalópodos y sólo ocasionalmente Anthozoa y Polychaeta. No se observa variación intraespecífica en la dieta, asociada al sexo o al tamaño de los individuos, en el rango de tamaños estudiados (57 a 161 cm de LT). Se observan diferencias geográficas...
Tipo: Journal article
Palavras-chave: Bacalao de profundidad; Ecología trófica; Ambientes profundos; Talud continental; Chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100011

Utilización de marcas electrónicas "PIT tags" en Liolaemusy descripción de una técnica de implante para especies de pequeña y mediana talla
Provedor de dados: 72
Autores: Lobos,Gabriel; Méndez,Constanza; Alzamora,Alejandra.
Los estudios de campo con reptiles, requieren en muchas oportunidades de poder contar con métodos de mareaje que permitan el seguimiento de los animales en el mediano y largo plazo y que ellos sean válidos desde la perspectiva bioética. En este trabajo, validamos la utilización de marcas electrónicas "PIT tags" (Passive Integrated Transponder) para el género Liolaemusen Chile. Nuestros resultados muestran que el uso de estas marcas fue satisfactorio en al menos 6 especies de saurios, registrándose recapturas variables según especies y un incremento importante del peso en aquellos animales recapturados. Esta técnica, representa un método de marcaje de baja invasividad en relación a otros métodos clásicos como las mutilaciones.
Tipo: Journal article
Palavras-chave: PIT tags; Liolaemus; Chile; Marcaje-recaptura; Microchips.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100004

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

PARTICIPACION DE SEÑALES QUIMICAS EN EL RECONOCIMIENTO Y DISCRIMINACION DE SEXOS EN BOA CONSTRICTOR OCCIDENTALIS (SERPENTES, BOIDAE)
Provedor de dados: 72
Autores: Chiaraviglio,Margarita; Briguera,Verónica.
La presencia de una feromona sexual en los ofidios permite el reconocimiento de las especies y estimula el cortejo en los machos. El comportamiento de los boídeos en el contexto de la comunicación quimiosensorial es conocido en representantes del género Epicrates. Son objetivos de este trabajo determinar si Boa constrictor occidentalis detecta quimiosensorialmente el olor de las secreciones de glándulas ubicadas en la región cloacal y de la piel de individuos de la misma especie y establecer si estas secreciones participan en la discriminación de los sexos. La respuesta a los estímulos se determinó midiendo la frecuencia de lengüeteos. Se presentaron cinco estímulos provenientes de la piel y las glándulas cloacales de individuos de la misma especie. Los...
Tipo: Journal article
Palavras-chave: Quimiorrecepción; Lengüeteo; Ofidios; Feromonas; Piel; Glándulas cloacales.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000100002

SCHOOL TYPOLOGY AND 3D DYNAMICS: STUDY OF THE BEHAVIOURAL MECHANISMS ALLOWING ADAPTATIONS OF COLLECTIVE STRUCTURE TO ENVIRONMENTAL CHANGES
Provedor de dados: 72
Autores: Gerlotto,Francois; Gutierrez,Mariano; Bertrand,Sophie.
Being the collective interface with the environment and the exploitation, schools and their typology represent an important life history trait of gregarious fish. Changes in the characteristics of the environment sensu largo induce changes in the school typology, which can be used as indicator of stock adaptive patterns. In order to understand the interactions between school structure and environment patterns, a first step consists in studying the school internal structure and the functioning of fish aggregation inside it and in its surroundings. The paper describes the spatial morphology and dynamics changes in Peruvian Anchovy (Engraulis ringens) schools in Peru using multibeam sonar observation on a station. Different cases of school types are extracted...
Tipo: Journal article
Palavras-chave: School typology; School dynamics; Anchovy; Multibeam sonar; Geostatistics; Fractal dimensions.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200041

ESTUDIO POBLACIONAL DE MACROCYSTIS PYRIFERA (L.) C. AGARDH (LAMINARIALES: PHAEOPHYTA) EN AMBIENTES PROTEGIDO Y EXPUESTO AL OLEAJE EN TIERRA DEL FUEGO
Provedor de dados: 72
Autores: Plana,Jordi; Mansilla,Andrés; Palacios,Mauricio; Navarro,Nelso P.
Se realizó un estudio poblacional sinóptico en poblaciones de Macrocystis pyrifera considerando distintos regímenes de exposición al oleaje en el Estrecho de Magallanes. Para un mejor manejo y análisis de la información obtenida, se utilizó el análisis SIG (Sistema de Información Geográfica). Los estudios se llevaron a cabo en Bahía Porvenir (53º 18' S; 70º 24' W), Tierra del Fuego. Los muestreos se realizaron en transectas perpendiculares a la línea de costa, utilizándose tres cuadrantes de 1 m² de área. Se estudiaron dos poblaciones, una localizada en una zona expuesta al oleaje y la otra en una zona protegida. Entre ambas poblaciones se compararon los siguientes parámetros biológicos: biomasa húmeda (kg m-2), densidad de estipes m², porcentaje de...
Tipo: Journal article
Palavras-chave: Macrocystis pyrifera; Phaeophyta; Estudio poblacional; Estrecho de Magallanes; Chile.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100007

FIRST RECORD OF ALPHEUS LOTTINI GUERIN, 1830 (DECAPODA, ALPHEIDAE) IN CHILEAN OCEANIC WATERS
Provedor de dados: 72
Autores: Retamal,Marco A; Navarro,María.E.
The first record of Alpheus lottini Guérin, 1830. In Chilean Oceanic waters is presented. It is the second record of the family AAlpheidae from Easter island
Tipo: Journal article
Palavras-chave: Easter island; Crustacea; Decapoda; Alpheidae.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000200013

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

PREFACE
Provedor de dados: 72
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200001

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

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

Summer food habits of the Patagonian opossum, Lestodelphys halli (Thomas, 1921), in southern arid Patagonian shrub-steppes
Provedor de dados: 72
Autores: Zapata,Sonia C; Procopio,Diego; Travaini,Alejandro; Rodríguez,Alejandro.
The summer diet of the Patagonian opossum Lestodelphys halli was studied in southern Argentinean Patagonia. Faeces of opossums captured alive and stomach contents from dead animals were collected and analyzed. A wide variety of invertebrates (87.2% frequency of occurrence) followed by birds and reptiles (10.64%) occurred both in faeces and stomachs, and fruits were occasionally consumed. Although the Patagonian opossum was reported as a carnivorous species in captivity, feeding mainly on rodents, reptiles, birds and invertebrates, we did not find remains of rodents in the diet of the opossums. We suggest that Patagonian opossums are not an efficient rodent predator in the wild. The high consumption of invertebrates, reptiles, birds and fruits during the...
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000100009

First record of flamentous fungi in the coastal upwelling ecosystem off central Chile
Provedor de dados: 72
Autores: Gutiérrez,Marcelo H; Pantoja,Silvio; Quiñones,Renato A; González,Rodrigo R.
We report for the frst time the presence of flamentous fungi in the water column and sediment in the coastal upwelling ecosystem off central Chile, using molecular tools and epifuorescence microscopy. Positive amplifcations of SSU 18s rDNA with specifc fungal primers were obtained for surface waters and sediments of this coastal ecosystem. Molecular richness obtained from denaturing gradient gel electrophoresis showed a higher number of fungal genotypes in nearshore than offshore sites and in summer than winter. Fungal structures identifed by epifuorescence microscopy in the water column were present as individual flaments or as aggregates of hyphae. We show for the frst time vertical water column profles of fungal biomass in the marine ecosystem. Fungal...
Tipo: Journal article
Palavras-chave: Fungi; Upwelling ecosystem; Central south Chile.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100010

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

Importancia de las enfermedades infecciosas para la conservación de la fauna silvestre amenazada de Chile
Provedor de dados: 72
Autores: VALENZUELA-SÁNCHEZ,ANDRÉS; MEDINA-VOGEL,GONZALO.
En conservación biológica existe un incremento en los antecedentes de que las enfermedades infecciosas (EIs) pueden afectar especies silvestres causando mortalidades que pueden aumentar el riesgo de extinción. Es así que para conseguir metas en conservación animal hoy se estima necesario conocer el rol de los patógenos en las poblaciones silvestres. En concordancia con lo anterior, los objetivos de este trabajo fueron: 1) determinar la contribución de las EIs a la declinación de las especies amenazadas de la fauna silvestre presente en Chile, de acuerdo a lo señalado por la Lista Roja de la UICN, 2) evaluar la evidencia existente en la literatura científica del impacto de las EIs en estas especies, y 3) proponer el nivel de riesgo para cada especie animal...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000100008

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

Morphological variations of Gracilaria chilensis Bird, McLachlan et Oliveira, 1986 (Rhodophyta, Gracilariales) in the southeast Pacific
Provedor de dados: 72
Autores: Edding,Mario; León,Cristina; Tala,Fadia.
The present work is a population morphometric study of Gracilaria from different environments along a latitudinal gradient of the Chilean coast that cover 1,500 km. Gracilaria species have been extensively exploited with an average extraction of 75,000 t per year. In Chile this seaweed is usually found in sandy bottom bays between Antofagasta (23º29'S - 70º25'W) and Chiloé (42º03'0''S - 73º11'0''W). Observations were made in 51 plants. Macroscopic observations were done in fresh plants, microscopic characters were determined in transversal sections with 20% Karo syrup and stained with aniline blue. Numerical analyses were performed by one-way ANOVA and Principal Component Analysis. The latter analysis was performed for those characters with significant...
Tipo: Journal article
Palavras-chave: Gracilaria chilensis; Seaweed; Morphology; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200009

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

OBSERVATIONS OF INTENSE SUN GLINT IN THE DAYTIME MID-INFRARED MODIS CHANNELS-FEASIBILITY FOR SEA SURFACE TEMPERATURE RETRIEVALS
Provedor de dados: 72
Autores: Kumar,Ajoy.
The affect of sun glint on the daytime mid infrared wavelengths of the MODerate-resolution Imaging Spectrometers (MODIS) data are explored. Differences of greater than 20C have been observed between the daytime thermal and mid infrared wavelengths sea surface temperature retrievals over the sun glint area. These differences can be attributed to daytime brightness temperature increases between the three bands in the MODIS mid infrared region over the sun glint area
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300005

Niveles de mercurio en sedimentos de la zona costera de El Oro, Ecuador
Provedor de dados: 72
Autores: Marín,Alfonso; Gonzalez,Víctor Hugo; Lapo,Byron; Molina,Estefanía; Lemus,Mairin.
RESUMEN Se analizó el contenido total de Hg en sedimentos superficiales en tres localidades de la zona costera de la Provincia de El Oro, Ecuador. En cada localidad se seleccionaron 9 zonas de muestreo, en los cuales se evaluó: sólidos totales (ST), humedad (H), materia orgánica (MO) y Hg total. La concentración del Hg fue determinada por espectrofotometría de absorción atómica, por generación de hidruros con atomización en una celda de cuarzo. Las concentraciones de Hg presentaron diferencias significativas entre las localidades, con la mayor concentración en el estero Huaylá (intervalo: 6,57-7,61 mg kg-1) y la menor en Bajo Alto (intervalo: 3,46-4,83 mg kg-1). Los niveles de Hg en los sedimentos sugieren una evidente incorporación antrópica en las tres...
Tipo: Journal article
Palavras-chave: Metal pesado; Contaminación; Zona costera; Materia orgánica.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200147

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

Fatty acid methyl esters extracted from the cuticular surface of Artemia franciscana (Kellogs, 1906) (Crustacea: Anostraca) increase the swim speed of conspecific males
Provedor de dados: 72
Autores: Tapia,Carola; Parra,Leonardo; Mutis,Ana; Gajardo,Gonzalo; Quiroz,Andrés.
ABSTRACT Previous researches have established that the swim speed of some microcrustaceans is influenced by chemical compounds emitted by conspecifics. We examined the hypothesis that cuticular compounds present on the body surface of A. franciscana, the most widespread member of Artemia genus, play a role in the swim speed of conspecific males. The movements (swim) of one male confronted to a sponge soaked with female or male cuticular extract, were recorded during 30 minutes and the swim speed was determined using a behavioral tracking software (Ethovision 3.1, Noldus Technologies). As a control, the movements of one male confronted to a sponge soaked with salty water or with a mixture of the solvents used in the extraction (chloroform-methanol), was...
Tipo: Journal article
Palavras-chave: Artemia; Swimming speed; Cuticular compounds; Fatty acids; Chemical communication.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200154

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

The feeding ecology of penaeid shrimp in tropical lagoon-estuarine systems
Provedor de dados: 72
Autores: GUTIÉRREZ,JESÚS C. S.; PONCE-PALAFOX,JESÚS T.; PINEDA-JAIMES,NOEL B.; ARENAS-FUENTES,VIRGILIO; ARREDONDO-FIGUEROA,JOSÉ L.; CIFUENTES-LEMUS,JUAN L.
Shrimps are an important resource in coastal lagoons because they use these ecosystems for their development. Although some authors classified the Penaeidae as detritivores, it was shown that their diet comprises a greater variety of food items. Many authors had reported that shrimps have a diversified diet that includes several elements of the benthic community. This review describes the feeding ecology of the shrimps in coastal lagoon-estuarine systems, with emphasis on the following: the effect of the environment on the shrimps&amp;#8217; natural food; techniques for identification of items in shrimps gut contents and stable isotope compositions; consideration of the importance of plants and small animals in the diet; and the effect of mangroves and...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100003

UNA NUEVA ESPECIE DE CHILENOPERLA (PLECOPTERA: GPJPOPTERYGIDAE) Y LAS CONSECUENCIAS TAXONÓMICAS DEL DESCUBRIMIENTO DE SU NINFA
Provedor de dados: 72
Autores: Vera,Alejandro.
Se describe una nueva especie de Gripopterygidae (Chilenoperla elongata n. sp.) sobre la base de especímenes imagos de ambos sexos y ninfas colectados en Chile. El estado ninfal fue relacionado mediante emergencias en laboratorio. La ninfa de la nueva especie resulta ser semejante a la asignada a Pelurgoperla (sensu lilies, 1963). Por lo tanto las identificaciones previas y las distribuciones geográficas dadas para estos géneros podrían estar erradas. La ninfa de Ch. puerilis es comentada a la luz del nuevo hallazgo.
Tipo: Journal article
Palavras-chave: Insectos acuáticos; Gripopterygidae; Chile; Taxonomía.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200005

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

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

Nuevos registros del gato colocolo, Leopardus colocolo colocolo (Carnivora: Felidae), en el desierto de Atacama, Región de Antofagasta, Norte Grande de Chile
Provedor de dados: 72
Autores: RAU,JAIME R; ZULETA,CARLOS; GANTZ,ALBERTO; IRIARTE,J. AGUSTÍN.
Registramos en Quebrada Jerez, Toconao (23º 11´ S y 67º 59´O, 2475 m.s.n.m.), desierto de Atacama (Norte Grande de Chile), la captura de un gato colocolo hembra. Esta captura más nuevos registros con trampas cámaras confirman para la subespecie Leopardus colocolo colocolo su presencia en la Región de Antofagasta. Presentamos datos biométricos y craneométricos y confirmamos por una radiografía de su dentición el estatus juvenil de este felino.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200009

FE DE ERRATAS
Provedor de dados: 72
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100015

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

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

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

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

LISTA SISTEMATICA DE ESPECIES DE PERACARIDOS DE CHILE (CRUSTACEA, EUMALACOSTRACA)
Provedor de dados: 72
Autores: González,Exequiel R; Haye,Pilar A; Balanda,Maria-José; Thiel,Martin.
Los crustáceos peracáridos comprenden un diverso grupo de invertebrados, comunes en ambientes terrestres, acuáticos dulceacuícolas y marinos. En este trabajo se revisa la diversidad de especies de los órdenes Amphipoda, Cumacea, Isopoda, y Tanaidacea, actualmente reportada para Chile. Otros grupos taxonómicos comúnmente incluidos en Peracarida no han sido citados aún para Chile. Presentamos en este trabajo una lista sistemática de los taxa de peracáridos y su distribución geográfica en Chile desde los 18°S hasta los 56°S, incluyendo el Archipiélago de Juan Fernández e Isla de Pascua. En un análisis preliminar, la distribución de las especies registradas para Chile sugiere que la diversidad de especies aumenta de norte a sur. El hecho que aún existen...
Tipo: Journal article
Palavras-chave: Peracarida; Amphipoda; Isopoda; Tanaidacea; Cumacea; Pacifico Sudoriental; Chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200006

UNA ESPECIE NUEVA DE PHTHEIROPOIOS (PHTHIRAPTERA, AMBLYCERA) PARASITA DE CTENOMYS SP. (RODENTIA, OCTODONTIDAE) DE LA PROVINCIA DE CORDOBA, ARGENTINA
Provedor de dados: 72
Autores: del C. Castro,Dolores; Cicchino,Armando C.
En este trabajo nos ocupamos de una especie nueva de Phtheiropoios, parásita de una especie aún no descripta de Ctenomys procedente de la provincia de Córdoba, Argentina. Se diferencia de las dos restantes incluidas en el "grupo forficulatus" por sus medidas corporales, menor número de setas abdominales en los segmentos I-IV, tamaño y proporciones de los genitales externos masculinos, y tamaño, forma y proporciones del dígito y tarsómero II de la forfícula masculina. Además de la característica coriónica externa de los huevos y la descripción morfológica, se analiza la distribución de las tres especies de este grupo en sus hospederos respectivos, concluyendo que todas son geográficamente alopátricas y que han tenido su propia historia evolutiva dentro de...
Tipo: Journal article
Palavras-chave: Phtheiropoios; Especie nueva "grupo forficulatus" descripciones Ctenomys Córdoba Argentina huevos.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200001

Natural disasters and scientific publication
Provedor de dados: 72
Autores: Fernández,Camila.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200001

REGISTRO ACTUAL DE ESPECIES DEL GENERO MUSCULIUM LINK, 1807 (BIVALVIA: SPHAERIIDAE) EN CHILE CON NOTAS SOBRE MORFOLOGIA Y BIOMETRIA DE SUS POBLACIONES
Provedor de dados: 72
Autores: Parada,Esperanza; Peredo,Santiago; Jara-Seguel,Pedro.
Se reporta el rango de distribución actual de Musculium argentinum (D'Orbigny, 1835) y Musculium patagonicum Pilsbry 1911 en Chile sobre la base de colectas realizadas entre lósanos 2002 al 2006. La caracterización morfológica y biométrica de las poblaciones estudiadas indican que M. argentinum se distribuye discontinuamente entre los paralelos 38°Sy41°Sy entre los meridianos 71 °0 y 72°0 habitando ambientes lacustres y fluviales. M. patagonicum fue registrado en un ambiente lacustre localizado en los 51°42'S; 72°25'0. Ambas especies son morfológicamente muy similares. M. argentinum difiere de M. patagonicum en que en el primero el contorno de sus valvas son marcadamente cuadrangulares o trapezoidales, con el extremo posterior suavemente truncado; con...
Tipo: Journal article
Palavras-chave: Musculium argentinum; Musculium patagonicum; Sphaeriidae; Chile; Distribución geográfica.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100008

THE IMPACT OF HIGH LATITUDE CLIMATE MODES ON ANTARCTIC SEA ICE
Provedor de dados: 72
Autores: Yuan,Xiaojun.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300054

ESTANDARIZACION DE LAS TASAS DE CAPTURA DE RECURSOS PELAGICOS DE LA ZONA NORTE DE CHILE
Provedor de dados: 72
Autores: Espíndola,Fernando; Yáñez,Eleuterio; Böhm,Gabriela.
Se usó el modelo lineal generalizado (MLG) para estandarizar el índice de abundancia relativa, captura por unidad de esfuerzo (CPUE) de anchoveta (Engraulis ringens), sardina (Sardinops sagax) y jurel (Trachurus murphyi), en la zona norte de Chile (18º21-24ºS), entre 1987 y 1997. Para la anchoveta se toma en cuenta la categoría de embarcación, la zona de pesca, la fase lunar, la estación del año, el año y la temperatura superficial del mar (TSM). En tanto que para la sardina y el jurel se toma en cuenta la categoría de embarcación, la zona de pesca, la fase lunar, la estación del año y el año. Estas variables muestran en general efectos bastante significativos en el logaritmo de la CPUE. Además, interacciones significativas son identificadas para la...
Tipo: Journal article
Palavras-chave: Estandarización; CPUE; Pelágicos; MLG; Interacciones; Zona norte de Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200011

Estado de conocimiento de los Briozoos dulceacuícolas de Chile
Provedor de dados: 72
Autores: Orellana Liebbe,María Cristina.
En Chile se han reportado seis especies de briozoos dulceacuícolas, pertenecientes a las familias Fredericellidae y Plumatellidae. La Familia Fredericellidae está representada sólo por la especie Fredericella sultana (Blumenbach 1779), y la Familia Plumatellidae por las especies: Plumatella punctata Hancock 1850, Plumatella patagonica Wiebach 1974, Plumatella casmiana Oka 1907, Plumatella repens (Linnaeus 1875) y Plumatella mukaii Wood 2001. El conocimiento sobre la taxonomía, ecología y biogeografías de las especies chilenas es todavía incipiente.
Tipo: Journal article
Palavras-chave: Briozoos chilenos; Taxonomía; Plumatellidae; Fredericellidae.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100015

OCEAN FEATURE DETECTION USING MICROWAVE BACKSCATTER AND SUN GLINT OBSERVATIONS
Provedor de dados: 72
Autores: Gagliardini,Domingo A; Colón,Pablo Clemente.
Synthetic Aperture Radar (SAR) satellite sensors have demonstrated their ability to observe ocean features related to dynamical processes including internal waves, currents, eddies, fronts, and the presence of bathymetric features. Because of the high resolution of available SAR sensors, circulation details and small-scale processes can be detected that are not observable by other sensors more frequently used for ocean research such as the NOAA AVHRR and the ORBVIEW2 SeaWiFS. In contrast to these, LANDSAT-TM thermal and optical channels can be used to observe sea surface temperatures, surface layer ocean color (upwelled radiance) as well as sun glint (reflected radiance) patterns of surface roughness at a spatial resolution comparable to that of SAR....
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200033

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

Hermetism between Camponotus morosus Smith and Linepithema humile Mayr (Hymenoptera: Formicidae)
Provedor de dados: 72
Autores: Ipinza-Regla,Joaquín; Fernández,Ana María; Morales,María Angélica; Araya,Jaime E.
ABSTRACT Hermetism, a behavior that isolates ant colonies, was studied in the laboratory between two ant species in Chile, Camponotus morosus Smith and Linepithema humile Mayr. Ants from five nests of C. morosus and L. humile were used, transferring ten individuals per nest of one of the colonies to receiving nests of the other. Conducts, including antennal exploration (AE), mandible opening (MO), dorsal flexion of the abdomen (DFA), biting (Bi), ventral flexion of the abdomen (VFA), fight (Fi), transport of the intruder ant (TI), moving backwards (MB), and death (De) were recorded during ten min, with ten replicates. The times of occurrence ± SD of each event were analyzed with the Student t test. The events AE, MO, DFA, and MB had a short latency time in...
Tipo: Journal article
Palavras-chave: Behavior events; Artificial nests; Chile.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382017000100022

PRIMER REGISTRO DE RHIPICEPHALUS SANGUINEUS (LATREILLE, 1806) (ACARI: IXODIDAE) EN RATTUS NORVEGICUS (MAMMALIA: RODENTIA) EN CHILE
Provedor de dados: 72
Autores: González-Acuña,Daniel; Venzal,José M.; Guglielmon,Alberto A.
Se registra por primera vez en Chile a Rhipicephalus sanguineus parasitando a un huarén (Rattus norvegicus) en la ciudad de Chillán. Se discute la importancia sanitaria hipotética de este hallazgo
Tipo: Journal article
Palavras-chave: Rhipicephalus sanguineus; Rattus norvegicus; Ixodidae; Chile.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100015

INTRODUCTION OF NEW J-OFURO LATENT HEAT FLUX DATA
Provedor de dados: 72
Autores: Kubota,Masahisa; Tomita,Hiroyuki.
Japanese Ocean Flux data sets with Use of Remote sensing Observations (J-OFURO) includes various kinds of satellite data sets related to ocean surface flux and is provided for research people on the web site (&lt;A HREF="http://dtsv.scc.u-tokai.ac.jp/"&gt;http://dtsv.scc.u-tokai.ac.jp&lt;/A&gt;) and anonymous ftp site. Recently we extended the data period for several kinds of data included in J-OFURO. We introduce the new J-OFURO latent heat flux data and some results using new J-OFURO turbulent heat flux data in this paper
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300004

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

Nueva especie de Pseudoleucania Staudinger endémica para la Isla Robinson Crusoe (Chile) (Lepidoptera: Noctuidae: Noctuinae)
Provedor de dados: 72
Autores: Carrera-Suárez,Luis E; Angulo,Andrés O; Olivares,Tania S.
Se describe e ilustra el macho de Pseudoleucania masatierrae Carrera-Suárez &amp;amp; Olivares n. sp. proveniente de la Isla Robinson Crusoe (= Más a Tierra), Archipiélago Juan Fernández, V Región, Chile. Se discute su distribución y la relación con la especie más próxima Pseudoleucania onerosa (Kóhler).
Tipo: Journal article
Palavras-chave: Taxonomía; Pseudoleucania onerosa; Más a Tierra; Archipiélago Juan Fernández.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100005

Estudio taxonómico de Chilenoperla puerilis (Insecta, Plecoptera), y su asignación a Ericiataperla nueva combinación
Provedor de dados: 72
Autores: VERA S.,ALEJANDRO.
Se realiza un estudio taxonómico de C. puerilis. Se redescribe la ninfa y describen los adultos de ambos sexos. Se identifican 17 rasgos en oposición con las restantes especies de Chilenoperla seis en adultos y once en ninfas. Estos resultados apoyan una nueva combinación nomenclatural para la especie dentro de un nuevo género nombrado Ericiataperla. El caso estudiado muestra la relevancia de asociar correctamente los estados de desarrollo en insectos acuáticos, para así asignarles atributos ecológicos y estimar la diversidad de los taxa involucrados.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100010

SUR UNE NOUVELLE ESPÈCE DU GENRE COPITARSIA HAMPSON AU CHILI (LEPIDOPTERA, NOCTUIDAE, CUCULLINAE)
Provedor de dados: 72
Autores: Angulo,Andrés O; Olivares,Tania S; Badilla,Rubén.
On décrit une nouvelle espèce du genre Copitarsia Hampson chez les noctuelles, Copitarsia murina n. sp. En plus de l'adulte on décrit la genitalia du mâle et celle de la femelle. Systematiquement la nouvelle espèce est prochaine de Copitarsia anatunca &lt;A HREF="#Angulo99"&gt;Angulo &amp;amp; Olivares&lt;/A&gt;. La distribution geographique connue est le Sector La Mina (960 m), VII Région. Chili (36º10'S; 71º02'W)
Tipo: Journal article
Palavras-chave: Lepidoptera; Noctuidae; Cucullinae; Copitarsia n. sp; Nouvelle espèce; Région Neotropicale.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000100001

Vertical and horizontal extension of the oxygen minimum zone in the easterns south Pactific Ocean
Provedor de dados: 72
Autores: Schneider,Wolfgang; Fuenzalida,Rosalino; Garcés-Vargas,José; Bravo,Luis; Lange,Carina.
Recent high-resolution hydrographic measurements (1976-2001) from the eastern South Pacific (ESP) were employed combined with high-resolution data from the World Ocean Circulation Experiment to evaluate the vertical and horizontal extension of the OMZ (oxygen minimum zone, &lt; 20 µmol kg-1) there. Of the six permanent hypoxic regions in the world oceans, the ESP OMZ is volumetrically the fourth largest, occupying 2.74 x 10(6) km³ and accounting for ~11% globally. Examples of variability in the vertical position of the OMZ in the water-column and also in its intensity offshore central Chile will be addressed. We conclude that the OMZ in the ESP is partly based on old, low-oxygen waters from intermediate depths of the North Pacific Ocean, which were further...
Tipo: Journal article
Palavras-chave: Oxygen minimum zone; Dissolved oxygen; Coastal upwelling; Eastern South Pacific; Peru; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300016

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

PREFERENCIAS ALIMENTARIAS Y POTENCIAL DISPERSOR DEL LAGARTO HERBIVORO PHYMATURUS FLAGELLIFER (TROPIDURIDAE) EN LOS ANDES
Provedor de dados: 72
Autores: Celedón-Neghme,Constanza; Salgado,Cristián R; Victoriano,Pedro F.
La mayoría de los reptiles, especialmente los lagartos, son insectívoros u omnívoros, razón por la cual poco se sabe acerca del rol que juegan como dispersores de plantas. Phymaturus flagellifer es una lagartija andina saxícola y herbívora. De acuerdo a observaciones preliminares sobre su comportamiento y a estimaciones de su ámbito de hogar, esta lagartija liberaría semillas lejos de la planta madre, y jugaría un rol como potencial dispersor. Este trabajo tiene por objetivo determinar si existe preferencia por el consumo de las distintas especies de semillas detectadas en las fecas y evaluar la legitimidad del lagarto como dispersor. Para esto, durante marzo del 2003, se recolectaron semillas de las plantas presentes en una área rocosa del Parque Nacional...
Tipo: Journal article
Palavras-chave: Lagarto andino; Frugivoría; Dispersión de semilla.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200007

EXTENTION OF THE CURRENT NORTHERN DISTRIBUTION RANGE OF FRESHWATER MUSSEL Diplodon chilensis (GRAY, 1828) (BIVALVIA:HYRIIDAE) IN CHILE
Provedor de dados: 72
Autores: Parada,Esperanza; Peredo,Santiago; Valenzuela,José; Manuschevich,Daniela.
The extent of the northern distribution range of Diplodon chilensis is reported herein from specimens collected in the Río Grande, an affluent of the Río Limari located to the south of the village of Carachilla (30º28'S;71º05'W)
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200013

Microbial communities and their biogeochemical role in the water column of the oxygen minimum zone in the eastern South Pacific
Provedor de dados: 72
Autores: Ulloa,Osvaldo; Belmar,Lucy; Farías,Laura; Castro-González,Maribel; Galán,Alexander; Lavín,Paris; Molina,Verónica; Ramírez,Salvador; Santibáñez,Francisco; Stevens,Heike.
In recent years, our group has been studying the microbial communities of the water column associated with the oxygen minimum zone (OMZ) off northern Chile and Peru, trying to understand who the main players are in the OMZ biogeochemical cycles and which metabolic strategies they are using. For that, we are combining flow cytometry, molecular techniques and biogeochemical approaches. Most of our work, so far, has focused on microbes capable of doing oxygenic photosynthesis, such as the cyanobacteria, and those involved in the nitrogen cycle, such as the denitrifying, nitrifying and anammox bacteria. We have also started to look at the more general microbial abundance and diversity. In each case, we are finding that the OMZ holds distinct microbial...
Tipo: Journal article
Palavras-chave: Oxygen minimum zone; Microbial diversity; Nitrogen cycle.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300018

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

SKIN AND BULK SEA SURFACE TEMPERATURE ESTIMATES FROM PASSIVE MICROWAVE AND THERMAL INFARED SATELLITE IMAGERY AND THEIR RELATIONSHIPS TO ATMOSPHERIC FORCING
Provedor de dados: 72
Autores: Castro,Sandra L; Emery,William J; Wick,Gary A.
Infrared and microwave SST retrievals are highly complementary but are found to have significant differences that must be addressed if the products are to be combined. Individual products are evaluated using buoy observations to identify any dependence of the retrieval uncertainty on atmospheric forcing. The infrared products are seen to be affected by aerosols, water vapor, and SST while the microwave product is affected by atmospheric stability, wind speed, SST, and water vapor. Applying bias adjustments based on these results reduces the differences between the products
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200018

Seasonal variability in the hydrological and chemical structure of the suboxic waters at the cariaco time-series station
Provedor de dados: 72
Autores: Yrene M,Astor; Scranton,Mary; Guzmán,Laurencia; Thunell,Robert; Muller-Karger,Frank; Taylor,Gordon; Fanning,Kent; Varela,Ramón.
For more than ten years, the CARIACO Time-Series Program has studied seasonal patterns and interannual variability at the Cariaco Basin. Monthly core physical and biogeochemical observations have been collected since November 1995 at the CARIACO Time-Series station (10º 30' N, 64º 40' W). A region with suboxic conditions (oxygen and sulfide concentrations &lt;1 µM) is found at intermediate waters at the station. The characteristics of this region show time and space variability, depending on the dynamics of the water. In general, ammonium, nitrate and nitrite disappeared within the suboxic region, although there is a steep ammonium concentration increase with depth after the oxic-anoxic interface suggesting its consumption at this boundary. Our data shows...
Tipo: Journal article
Palavras-chave: Oxic-anoxic interface; Ventilation; Cariaco basin; Intrusions.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300002

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

ESTADO ACTUAL DEL CONOCIMIENTO DE HELMINTOS EN AVES SILVESTRES DE CHILE
Provedor de dados: 72
Autores: Hinojosa-Sáez,Ana; González-Acuña,Daniel.
Se revisaron un total de treinta y tres trabajos en helmintos de aves silvestres en Chile. Identificándose 22 familias y 34 géneros de helmintos. Entre las aves hospederas identificadas, los órdenes Chraradriiformes y Pelecaniformes presentan la mayor cantidad de registros. Este trabajo complementa la lista parcial elaborada por Cattan (1995)
Tipo: Journal article
Palavras-chave: Helmintos; Aves; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200004

FISH STOCK ASSESSMENT USING MARINE ACOUSTICS DETECTION AND OCEANOGRAPHICAL CHARACTERISTICS IN JAVA SEA
Provedor de dados: 72
Autores: Pasaribu,Bonar P.; Manurung,Djisman; Nugroho,Duto.
Study on the movements of pelagic fish as a benchmark of pelagic fish stock assessments were investigated by using marine acoustics detection and oceanographical characteristics. Several surveys during 1992 to1994 using a dual-beam BioSonics 120 kHz echo-sounder installed on R/V Bawal Putih (192 GT) were carried out in the middle part of Java Sea. The objective was to verify the importance of seasonal shifting on fish abundance under strong influence of environmental changes. Data were systematically stored using Ines-Movies acquisition and processing system along isobaths 50m to100m. A depth layer was adjusted under 10m stratifications. Descriptions on environmental frame were done through measurements of temperature and salinity by using Seabirds CTD...
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300027

REGISTRO DE POMACEA CANALICULATA (LAMARCK, 1822) (AMPULLARIIDAE), MOLUSCO EXOTICO PARA EL NORTE DE CHILE
Provedor de dados: 72
Autores: Jackson,Douglas; Jackson,Donald.
En este trabajo informamos acerca de la presencia en la costa de Choapa (IV Región de Coquimbo, Chile), de un molusco de agua dulce Pomacea canaliculata (Lammarck, 1822) (Ampullariidae). Se describe la morfología, habitat y relaciones con otros moluscos de agua dulce. Se discute su potencial rol con relación a la zoonosis parasitaria.
Tipo: Journal article
Palavras-chave: Pomacea canaliculata (Lammarck); Norte of Chile; New record.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000100006

Fundamento y aproximación Metodológica del Estudio de peces del Río San Pedro
Provedor de dados: 72
Autores: Habit,Evelyn; Parra,Oscar.
El río San Pedro corresponde al sistema fluvial que desagua la cadena de ocho lagos andinos de la cuenca del río Valdivia (Región de los Ríos). Este sistema recorre 40 km entre el desagüe del lago Riñihue y su confluencia con el río Collileufu, donde cambia de nombre a río Calle Calle. En él se proyectó construir la "Central Hidroeléctrica San Pedro", cuyo muro se ubica 14 km aguas abajo del desagüe del lago Riñihue y la cual transforma 12,5 km de río en embalse. Ello generó la necesidad de elaborar un Estudio de Impacto Ambiental, el cual fue desarrollado por el Centro de Ciencias Ambientales Eula Chile (Universidad de Concepción). En relación a la ecología del río, dicho estudio puso especial énfasis en generar el conocimiento de detalle sobre su...
Tipo: Journal article
Palavras-chave: Río San Pedro; Central Hidroeléctrica; Evaluación de Impacto.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100001

Oxygen deficiency and benthic communities in the peruvian upper continental margin
Provedor de dados: 72
Autores: Gutiérrez,Dimitri; Quipúzcoa,Luis; Enríquez,Edgardo.
The oxygen minimum zone (OMZ) off the Peruvian coast, though shallower and more intense than other OMZs, exhibits a spatial distribution that varies with latitude, depth and distance to the coast. The spatial variability in oxygen content imposes latitudinal and bathymetric zonations of the benthic communities. Nevertheless the spatial patterns of the benthic communities are also modulated by the bottom topography and the sedimentary environments, which in turn are controlled to a large extent by the poleward undercurrent. While the bathymetric patterns of the macro- and meiobenthos have been previously described, latitudinal changes have received less attention. We found that, in parallel with opposed latitudinal gradients of oxygen and fresh organic...
Tipo: Journal article
Palavras-chave: OMZ; Peru; Benthos; Thioploca; Pearson and Rosenberg model.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300008

MULTISPECTRAL TRACKING OF PHYTOPLANKTON IN THE COLOMBIAN CARIBBEAN
Provedor de dados: 72
Autores: Ojeda Caicedo,V. V.; Plata Gómez,A.
In a quantitative research study, the concentration and circulation of group of micro-organisms "phytoplankton" have been found trough the images of the ocean colour in the Colombian Caribbean Sea. These images have been observed trough the Sea Star satellite. The method logical procedure was to collect a number of ocean images at the 1A level of the sensor SeaWifs. This only covered the geographical area of study and the seasons of the year. The selection criterion was to give priority to the absence of clouds in the area. Afterwards, the images were analyzed to create mosaics in convenient periods of the to, in turn visualize the periodical changes of the micro-organisms. Thus place with higher concentration of phytoplankton in the study site were...
Tipo: Journal article
Palavras-chave: Ocean color; Primary production; SeaWifs; SeaDas.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300024

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

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

First Report on Bat Mortalities on Wind Farms in Chile
Provedor de dados: 72
Autores: ESCOBAR,LUIS E; JUAREZ,CÉSAR; MEDINA-VOGEL,GONZALO; GONZALEZ,CARLOS M.
In Latin America there is a lack of scientific reports of bat mortality caused by wind farms operation. We report for the first time, clear evidence of bat mortalities from wind farms in Chile. We generated an ecological niche model of the affected species, Tadarida brasiliensis, to explore areas of potential species distribution overlapping with areas with distribution of wind farms in Chile. We found that T. brasiliensis potential distribution overlaps with the current and future distribution of wind farms in Chile. Rapid developments are currently being made within the wind energy industry in Chile. Future research should quantify the impact patterns of wind farms on wildlife, explore mitigation methods, and determine the areas with high biodiversity...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100003

EL SUBGENERO FORCIPOMYA (EUPROJOANNISIA) EN LA PATAGONIA (DIPTERA: CERATOPOGONIDAE)
Provedor de dados: 72
Autores: Marino,Pablo I; Spinelli,Gustavo R.
Se describe e ilustra una especie nueva del subgénero Euprojoannisia Brèthes, F. (E.) esteparia, capturada en estepas de la provincia de Chubut en Argentina. Forcipomyia setosicrus (Kieffer), previamente ubicada en el subgénero Forcipomyia Meigen, se reconoce como perteneciente al subgénero Euprojoannisia. Para esta última especie, se redescribe el macho y se describe la hembra, se designa el neotipo y se establece, asimismo, su amplio rango distribucional en Argentina y en Chile
Tipo: Journal article
Palavras-chave: Ceratopogonidae; Forcipomyia; Subgénero Euprojoannisia; Neotipo; Patagonia.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382001000100003

Relación longitud-peso y factor de condición de los peces nativos del río San Pedro (cuenca del río Valdivia, Chile)
Provedor de dados: 72
Autores: Cifuentes,Roberto; González,Jorge; Montoya,Germán; Jara,Alfonso; Ortíz,Néstor; Piedra,Priscila; Habit,Evelyn.
La relación longitud-peso y el factor de condición (K) son descriptores de gran interés en la biología de poblaciones de peces, ya que aportan información fundamental sobre estrategias de crecimiento, estado nutricional y reproducción. También son parámetros ampliamente utilizados para comparar la condición de poblaciones que habitan en sistemas acuáticos con distintos grados de intervención antrópica. Por ello, conocer el comportamiento de poblaciones que habitan en ecosistemas prístinos, entrega información de base, relevante para comprender cambios o efectos en poblaciones sometidas a estas presiones. El río San Pedro de la cuenca del Valdivia, sur de Chile, es un sistema que se caracteriza por su actual bajo nivel de intervención, su alta diversidad...
Tipo: Journal article
Palavras-chave: Río San Pedro; Relación longitud - peso; K; Peces nativos.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100009

Estado de conocimiento de las algas dulceacuícolas de Chile (Excepto Bacillariophyceae)
Provedor de dados: 72
Autores: Parra,Oscar.
Se hace una revisión de la información taxonómica de las algas dulceacuícolas de Chile, particularmente referida a la diversidad expresada como riqueza específica de los grupos de algas que han sido citados para el país, exceptuando al grupo de las diatomeas o Bacillariophyceae. El análisis comprende desde las primeras citas bibliográficas a un análisis de la información existente. Se entrega un inventario de los géneros y especies citados por clase de algas, los tipos de comunidades, los cuerpos de aguas más estudiados, y se describen también algunas contribuciones que han significado un aporte al conocimiento taxonómico y florístico de estos grupos de algas. Gran parte de la información taxonómica ha derivado de estudios que en la mayoría de los casos...
Tipo: Journal article
Palavras-chave: Microalgas; Sistemas dulceacuícolas; Biodiversidad; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100003

Probabilistic model for understand presence of Temnocephala chilensis (Moquin-Tandom 1846) (Platyhelminthes: Temnocephalidae) on adults of a population of Parastacus pugnax (Poeppig 1835) (Decapoda: Parastacidae) in southern Chile
Provedor de dados: 72
Autores: DE LOS RIOS-ESCALANTE,PATRICIO; SALGADO,ITALO; RAUQUE,CARLOS; GONZALEZ,NOEMIT.
The literature reported ectocommensals associated to Parastacus pugnax (Poeppig, 1835), but there are not ecological studies about abundance of these on P. pugnax. The aim of the present study was to analyze the abundances of ectocommensal Temnocephala chilensis (Moquin-Tandom, 1846), on P.pugnax. It had not correlation between T. chilensis number with total length and total weight of P. pugnax. T. chilensis has an associated spatial distribution and negative binomial distribution. Ecological and evolutive topics were discussed.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200001

FE DE ERRATAS
Provedor de dados: 72
Tipo: Journal article
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200027

Erroneous identification of the mussel, Mytilus galloprovincialis (Lamarck 1819) as the specie, Mytilus chilensis (Hupe 1854) in the Bay of Concepcion, Chile
Provedor de dados: 72
Autores: Tarifeño,Eduardo; Galleguillos,Ricardo; Llanos-Rivera,Alejandra; Arriagada,Daniel; Ferrada,Sandra; Canales-Aguirre,Cristian B; Seguel,Maritza.
This communication informs that presence of the Chilean mussel, Mytilus chilensis (Hupe 1854) in the coast of the Bay of Concepcion (Chile) reported in the scientific literature is an erroneous identification, being Mytilus galloprovincialis (Lamarck 1819) the right species.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300010

REGISTRO DE POLIPLOIDIA EN LA ALMEJA DULCEACUICOLA MUSCULIUM ARGENTINUM (D'ORBIGNY 1835) (SPHAERIIDAE, VENEROIDA)
Provedor de dados: 72
Autores: Jara-Seguel,Pedro; Peredo,Santiago; Parada,Esperanza.
La poliploidía es un carácter inusual en moluscos bivalvos. Sin embargo, datos citogenéticos documentados para especies de la subfamilia Sphaeriinae (familia Sphaeriidae) del hemisferio norte muestran números cromosómicos que varían desde 36 hasta ca. 247. La almeja dulceacuícola Musculium argentinum (D'Orbigny 1835) presenta un número cromosómico 2n = ca. 130, lo cual muestra que la poliploidía también estaría presente en esféridos sudamericanos. Estos antecedentes citogenéticos sugieren que Sphaeriinae podría constituir un complejo poliploide maduro
Tipo: Journal article
Palavras-chave: Sphaeriidae; Musculium argentinum; Poliploidía; Complejo poliploide.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100006

In vitro effect of Levamisole on Rainbow Trout (Oncorhynchus mykiss) peripheral blood mononuclear cells
Provedor de dados: 72
Autores: GÓMEZ,LEONARDO A; CORTES,RAUL A; SMITH,CARLOS T.
The in vitro effect of levamisole (1, 10 and 100 &amp;#956;g/ml) on cells of the innate immune response of rainbow trout (Oncorhynchus mykiss) was studied, particularly the activity of natural cytotoxic cells and macrophages present in peripheral blood. Levamisole effect on natural cytotoxic cells was evaluated by their capacity to lyse HL-60 tumor cells while activity of macrophages was evaluated measuring production of reactive oxygen species and nitric oxide. Results indicate that natural cytotoxic cells activity was significantly increased by 1 &amp;#956;g/ml levamisole and that higher doses had no effect. On the other hand, reactive oxygen species and nitric oxide production by macrophages was not increased by any of the levamisole doses used and that...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200006

ENSAMBLES DE AVES EN EL DESIERTO DE ATACAMA, NORTE GRANDE DE CHILE
Provedor de dados: 72
Autores: Gantz,Alberto; Rau,Jaime; Couve,Enrique.
Se evaluó la riqueza y composición de especies de aves en el desierto de Atacama, Norte Grande de Chile, entre 1996 y 1998. Mediante transectos lineales se estimó la riqueza de especies de aves en 9 localidades del desierto de Atacama agrupadas en cuatro zonas ecológicas: Desierto Litoral, Desierto Interior, Tropical Marginal y Tropical de Altura. La riqueza total de aves fue de 80 especies distribuidas en 51 géneros y 26 familias. La riqueza total observada corresponde al 52% de las aves históricamente descritas para el desierto del Norte Grande de Chile. Las zonas ecológicas del desierto litoral y tropical de altura poseen elementos avifaunísticos únicos para cada zona. Las aves insectívoras predominaron entre los demás gremios tróficos (40% del total de...
Tipo: Journal article
Palavras-chave: Aves terrestres; Chile; Desierto; Diversidad.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000200002

Extension of the distributional range of Lithobius obscurus Meinert (Lithobiidae, Lithobiomorpha) in organic and conventional apple orchards in Central Chile
Provedor de dados: 72
Autores: MOYA-HERNÁNDEZ,MARIO G; VEGA-ROMÁN,EMANUEL; SÁEZ,CLAUDIO A; MUNDACA,ENRIQUE A.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000200011

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

Leaf litter decomposition from native and non-native species in a freshwater forested wetland of Chile
Provedor de dados: 72
Autores: Gómez-Capponi,Francisco; Correa-Araneda,Francisco; Díaz,Ma Elisa; Olguín,Manuel; Encina-Montoya,Francisco; Figueroa,Ricardo.
ABSTRACT Decomposition of leaf litter is a fundamental process for the functioning of forested wetlands. The rapid increment of forest plantations has involved a greater contribution of leaf litter of exotic origin to these ecosystems. The decomposition rate between leaf litter of native and exotic origin in a forested wetland of the Mediterranean zone of Chile was compared, as well as the contribution of bacteria and macroinvertebrate to this process. It was determined that the decomposition rate of the leaf litter presented significant differences (p &lt; 0.05) between species, being faster in those of non-native origin. This could be due to differences in ecophysiological aspects of the leaves like the presence of chemical compounds such as waxes or...
Tipo: Journal article
Palavras-chave: Allochthonous detritus; Bacteria; Lentic ecosystem; Macroinvertebrates.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382017000100001

Juveniles de salmón chinook (Oncorhynchus tshawytscha Walbaum, 1792) en ríos y lagos de la patagonia chilena
Provedor de dados: 72
Autores: Ibarra,Jimena; Habit,Evelyn; Barra,Ricardi; Solís,Katherin.
La presencia de salmón Chinook asilvestrado se ha reportado en Chile desde 1995 con un aumento de la frecuencia de las corridas hacia ríos patagónicos y el consecuente asentamiento temporal de poblaciones juveniles. Con el fin de comprender las implicancias ecológicas de la presencia de estas nuevas poblaciones de juveniles de Chinook en ríos y lagos patagónicos, estudiamos la dieta, condición y edad de individuos de 4 cuencas del sur de Chile (río Puelo, Blanco, Aysén y Futaleufú). Para ello analizamos 104 individuos, 67 provenientes de lagos y 37 provenientes de sistemas fluviales. Algunos juveniles capturados en las cuencas de Aysén (río Aysén) y Futaleufú (lago Yelcho) presentaron edades mayores a 1 año, los cuales corresponden a poblaciones "stream...
Tipo: Journal article
Palavras-chave: Chinook juveniles; Dieta; Factor de condición; Piscivoría; Patagonia; Chile.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000100002

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

NUEVOS HOSPEDADORES Y LOCALIDADES DE IXODES SIGELOS E IXODES AURITULUS (ACARI: IXODIDAE) EN CHILE
Provedor de dados: 72
Autores: González-Acuña,Daniel; Venzal,José M.; Guglielmone,Alberto A.
Se observó un individuo de Rattus norvegicus infestado con una ninfa de Ixodes sigelos y dos de Oligoryzomys longicaudatus cada uno infestado con una larva de I. sigelos. Ambos son nuevos hospedadores de esta garrapata parásito de roedores descrita exclusivamente en Chile. También se presenta el primer registro del ave Cureus cureus como hospedador de garrapatas del grupo Ixodes auritulus en Chile desde un ave infestada con una hembra de esta especie de garrapata. Los tres hospedadores fueron capturados en Chillán. Se discute el status de las especies de Ixodes de Chile
Tipo: Journal article
Palavras-chave: Chile; Ixodes sigelos; Ixodes auritulus; New hosts.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100012

FORAMINIFEROS BENTONICOS ROTALINIDOS DEL CENTRO SUR DE CHILE (36°S - 44°S)
Provedor de dados: 72
Autores: Figueroa,Sylvia; Marchant,Margarita; Giglio,Susana; Ramírez,Myriam.
Se describe la foraminiferofauna bentónica calcárea del orden Rotaliina, extraída mediante multicore, por la expedición científica alemana PUCK a bordo del R/V SONNE (Cruise SO-156: Valparaíso-Chiloé, 2001). Las muestras fueron extraídas con multicore entre 125 y 3.485 m de profundidad. En total se obtuvieron 579 individuos/cm³ (&gt; 150 mm), los que se distribuyen en 61 especies, 29 géneros y 19 familias de Rotalínidos. La Familia Quadrimorphinidae constituye un nuevo registro para las costas chilenas y las especies Astrononion tumidum, Bolivina cf danvillensis son nuevos registros para el área entre Concepción (36º S) y las Islas Guaitecas (44º S). Se describe Cibicides moyanoi como nueva especie, recolectada entre los 41º S y 44º S
Tipo: Journal article
Palavras-chave: Foraminíferos bentónicos calcáreos; Recientes; Taxonomía; Distribución; Pacifico sureste; Nueva especie.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000200013

MITES IN THE PARENCHYMA OF JUNCUS PROCERUS IN MARSHEY WETLANDS IN THE BIO BIO REGION, CHILE
Provedor de dados: 72
Autores: Villagrán-Mella,Romina; Casanueva,María E.; Parra,Luis E.
The first record of mites in the parenchyma of Juncus procerus in marshey wetlands in the region of Bio Bio, Chile, is presented. Nine genera and families and three suborders were found. Eight species are new records for Chile and have not been previously cited as mites associated with aquatic environments. They are the following: Mesostigmata: Holoparasitus sp. and Hypoaspis sp., Prostigmata: Trombidium sp., Trombiculidae sp., Balastium sp., Cyta sp. and Eupodes sp.; and Oribatida: Pergalumna sp. Facts about habitats and known distribution are included for all found taxa
Tipo: Journal article
Palavras-chave: Acari; Parenchyma; Juncacea; Wetlands; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100004

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

Estado de conocimiento de las aves de aguas continentales de Chile
Provedor de dados: 72
Autores: Victoriano,Pedro F; González,Angélica L; Schlatter,Roberto.
En este trabajo se informa de manera sintética la composición de especies, distribución, estatus de conservación y algunos aspectos de la biología de las aves acuáticas de ambientes continentales de Chile. Esta avifauna está compuesta por un total de 133 especies, distribuidas en 69 géneros, 21 familias y 10 órdenes. El grupo representado por el mayor número de especies es el Orden Charadriiformes (51 especies), con una alta presencia en ambientes ecotonales estuarinos. En ambientes de aguas interiores el grupo con más especies es el Orden Anseriformes (29 especies). La distribución de la riqueza de especies se corresponde en términos generales con las tendencias de representación para cada Orden en Sudamérica. De acuerdo a esta revisión, una parte...
Tipo: Journal article
Palavras-chave: Chile; Aves acuáticas; Humedales; Riqueza taxonómica.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100019

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

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

PARAMETROS BIOLOGICO-PESQUEROS DE REINETA BRAMA AUSTRALIS VALENCIENNES 1837 EN LA ZONA DE PESCA DE LEBU (37°37'S.-73°40'W ), CHILE
Provedor de dados: 72
Autores: Leal,Elson; Oyarzún,Ciro.
Se estima la talla de primera madurez (TPM) de las hembras de (Brama australis). en 36,9 cm, se establece un aumento de la actividad reproductiva en los meses de julio y agosto; la tasa de mortalidad total (Z), natural (M) y por pesca (F), resultaron en valores de 1,13; 053 y 0,60 año-1 respectivamente. Se estiman además otros parámetros como la relación Longitud-Peso (RLP) y edad Crítica (t#) del recurso Se analizan un total de 1061individuos capturados en la zona litoral de Lebu (37°37' S - 73°;40'W) entre enero y septiembre de 2001. Tanto la TPM como la t# estarían siendo protegidas con el régimen de operación de la flota pesquera, indicando una situación aceptable de extracción en la zona estudiada. Sin embargo, se propone realizar una evaluación...
Tipo: Journal article
Palavras-chave: Reineta; Reproducción; Talla crítica; Mortalidad; Longitud-peso.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200020

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

ICTIOFAUNA DE UN SISTEMA FLUVIAL RECEPTOR DE AGUAS SERVIDAS: RESPUESTAS A UNA NUEVA PLANTA DE TRATAMIENTO (RIO QUILQUE, CHILE CENTRAL)
Provedor de dados: 72
Autores: Habit,Evelyn; Parra,Oscar; Valdovinos,Claudio.
El sistema fluvial Quilque (orden 3) recibe las descargas de aguas servidas de una población aproximada de 115.000 habitantes y de 19 industrias. Estos residuos se vertían sin tratar directamente al curso del río hasta fines del año 2002, cuando se puso en marcha una planta de tratamiento de aguas servidas. Para analizar los efectos de estas descargas sobre la fauna de peces, se estudió la calidad del agua y estructura comunitaria de la ictiofauna a lo largo de ocho estaciones ubicadas desde aguas arriba de los vertidos hasta 300 m aguas abajo del efluente de la planta de tratamiento. Tanto la calidad del agua como la fauna de peces mostraron una leve mejoría luego de cinco meses de operación de la planta de tratamiento. Aun cuando se redujeron las...
Tipo: Journal article
Palavras-chave: Ictiofauna; Aguas servidas; Planta tratamiento; Quilque; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382005000100010

UN PARATIPO ERRADO DE PAREUXOA KOEHLERI OLIVARES (LEPIDOPTERA: NOCTUIDAE)
Provedor de dados: 72
Autores: Olivares,Tania S.; Angulo,Andrés O.
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200013

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

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

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

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

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

THE CONSERVATION STATE OF CHARACIDAE FISH (PISCES: CHARACIFORMES) IN AN AREA OF THE PLATA BASIN, ARGENTINA
Provedor de dados: 72
Autores: Zayas,Marcelo A; Cordiviola,Elly.
The fish conservation was quantified by means of the index SUMIN, composed by the summation of 12 outstanding variables for the species survival and/or conservation. An arranged list of 53 species was obtained according to a gradient of conservation necessity. The species determined as vulnerable of maximum priority: Salminus brasiliensis, Pygocentrus nattereri, Serrasalmus marginatus and S. rhombeus; species vulnerable of special attention: Brycon orbygnianus, Triportheus paranensis, Serrasalmus serrulatus, S. spilopleura, Piaractus mesopotamicus, Hemigrammus mattei, Cynopotamus argenteus, Astyanax correntinus, Gymnocorymbus ternetzi, Hyphessobrycon anisitsi and Mylossoma orbignyanus. The remaining species, were qualified as not threatened: Poptella...
Tipo: Journal article
Palavras-chave: Conservation; Fish; Characidae; South America.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000200006

NUEVO GENERO Y NUEVAS ESPECIES DE NOCTUIDOS ALTOANDINOS V. TERNERA RODRIGUEZ &amp;amp; ANGULO N. GEN. V/S GENEROS AFINES (LEPIDOPTERA: NOCTUIDAE: CUCULLINAE)
Provedor de dados: 72
Autores: Rodríguez,Marcela A.; Olivares,Tania S.; Angulo,Andrés O.
Se realiza una revisión taxonómica del género Albirenia Angulo &amp;amp; Olivares, desprendiéndose de ésta la creación de un nuevo género, Tenera Rodríguez &amp;amp; Angulo n. gen., con dos especies. Se reubican algunas especies de los géneros Valeria Stephens (Cucullinae) y Eucoptocnemis Grote (Noctuinae), en Albirenia &lt;A HREF="#Angulo1999"&gt;Angulo &amp;amp; Olivares (1999&lt;/A&gt;). Se redefinen algunos caracteres para Albirenia. Se confecciona una clave para los géneros Albirenia Angulo &amp;amp; Olivares, Tenera Rodríguez &amp;amp; Angulo n. gen. y Curvalia Olivares &amp;amp; Angulo in litteris.
Tipo: Journal article
Palavras-chave: Albirenia Angulo &amp;amp; Olivares clave genérica Curvalia Olivares &amp;amp; Angulo in litteris Tenera Rodríguez &amp;amp; Angulo n. gen nuevas combinaciones nuevas especies.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200005

Implementation of an eco-hydrological classification in Chilean rivers
Provedor de dados: 72
Autores: Peredo-Parada,Matías; Martínez-Capel,Francisco; Quevedo,Diana I; Hernández-Mascarell,Aina B.
Concern has grown in Chile to protect and conserve aquatic ecosystems taking into account the high degree of habitat degradation. As a first step towards the development of conservation plans, it is necessary to classify these ecosystems in order to learn about them and understand their different types and functions. Considering that hydrological regime is the main factor in the composition of river ecosystems, an Eco-Hydrological Classification of Chilean Rivers (REC-Chile) has been developed. REC-Chile is based on the hierarchical superposition of the controlling factors of the hydrological pattern in Chile. REC-Chile is a multi-scale classification system, allowing to represent different river patterns at different spatial scales according to the...
Tipo: Journal article
Palavras-chave: Hierarchical classification; Controlling factors; Hydrological pattern; Rivers; Chile.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000100003

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

EL ZOOPLANCTON DE TRES LAGOS SOMEROS DE DIFERENTE SALINIDAD Y ESTADO TROFICO EN LA REGION SEMIARIDA PAMPEANA (ARGENTINA)
Provedor de dados: 72
Autores: Vignatti,Alicia; Echaniz,Santiago; Martín,María C.
El Valle Argentino es una formación medanosa ubicada en el centro de la provincia de La Pampa, en la región semiárida central de Argentina, en el que se encuentra un grupo de lagos someros, alimentados por lluvias, de distintas características físico-químicas, sobre todo la salinidad, pero que comparten un elevado grado de eutrofia. A los efectos de integrar información sobre la composición y variación de las asociaciones zooplanctónicas de ambientes de diferentes concentraciones de salinidad y grados de eutrofia, se analizaron, mediante muestreos mensuales, tres lagos someros (lagunas) del Valle Argentino, dos de ellos subsalinos y el tercero hipo-mesosalino. Las dos lagunas subsalinas son turbias, con cianofitas, y en ellas se registró la presencia de...
Tipo: Journal article
Palavras-chave: Boeckella; Copépodos; Daphnia; Nauplii; Rotíferos.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100005

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

ESTUDIO COMPARATIVO DE OVARIOS Y CUBIERTAS OVOCITARIAS EN PECES SILURIFORMES DE AGUAS CONTINENTALES DE CHILE
Provedor de dados: 72
Autores: Huaquín,Laura G.; Veliz,Dina; Arratia,Gloria.
El conocimiento de la estructura ovárica permite analizar la capacidad desovante, duración, temporalidad y forma en que se realiza esta función reproductiva. Se describen y analizan aspectos estructurales de las cubiertas ovocitarias de 2 especies de Siluriformes Nematogenys inermis especie considerada en peligro de extinción y de Trichomycterus areolatus, la más abundante y de mayor distribución en Chile continental. Cortes histológicos de 6 mm de ovarios fijados en Bouin fueron teñidos con HE, Azán, Van Gieson, Alcian Blue y PAS. El estudio histológico muestra la pared del ovario formada por el peritoneo externo, una túnica media y el epitelio ovárico. Desde la túnica se proyectan hacia el interior, láminas de tejido conectivo que van a constituir el...
Tipo: Journal article
Palavras-chave: Histología; Cubiertas ovocitos; Siluriformes.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200026

Microbial diversity and trophic components of two high altitude wetlands of the Chilean Altiplano
Provedor de dados: 72
Autores: SCOTT,SERGIO; DORADOR,CRISTINA; OYANEDEL,JUAN PABLO; TOBAR,IGNACIO; HENGST,MARTHA; MAYA,GIANNINA; HARROD,CHRIS; VILA,IRMA.
This study examines the limnology and ecology of two high altitude wetlands, Lirima (19°51&amp;#8217;24 S; 68°55&amp;#8217;02 W; 4000 m asl) and Caya (20°37&amp;#8217;21 S; 68°58&amp;#8217;28 W; 3700 m asl), located in the Chilean Altiplano. Both wetlands are formed by the evaporitic remnant basins of paleolakes which occupied an extensive area of what today is known as the Altiplano. These systems have a negative hydrological balance, receiving their water from groundwater, snow melt and limited seasonal rains. An ongoing negative water balance and the sediment characteristics in the region have accelerated the salinization process in these systems, as shown by their present physicochemical characteristics. Nutrient values were typical of mesotrophic to...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100006

Primer registro de Lampris guttatus (Pisces: Lamprididae) en el Golfo de Arauco, VIII Region, Chile
Provedor de dados: 72
Autores: Ruiz R,Víctor H; Figueroa J,Ricardo.
Se registra por primera vez para el Golfo de Arauco la presencia del pez ``opah" Lampris guttatus (Brunnich,1788), sobre la base de la captura de dos ejemplares, durante los meses de agosto de 1991 y septiembre de 2001. El ejemplar de mayor tamaño (1360 mm de longitud total y 73 kilos) se encuentra depositado en la colección ictiológica del Museo Zoológico de la Universidad de Concepción (MZUC/UCCC), el segundo ejemplar mide 1.290 mm y alcanzó un peso de 70 kg. El análisis del contenido estomacal reveló la presencia de restos digeridos de peces, moluscos y crustáceos. Un intestino relativamente corto confirma su régimen de alimentación carnívora.
Tipo: Journal article
Palavras-chave: Nuevo registro; Lamprididae; Lampris; Golfo de Arauco; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000200013

Regional Cumulative Effects Monitoring Framework: Gaps and Challenges for the Biobío River Basin in South Central Chile
Provedor de dados: 72
Autores: CHIANG,GUSTAVO; MUNKITTRICK,KELLY R.; MCMASTER,MARK E.; BARRA,RICARDO; SERVOS,MARK.
Sustainable watershed management in the world is an issue that has taken much importance and attention in terms of quality and availability of water for all users in the basin. The economic growth experienced by Chile in recent years has led to increased stress on aquatic systems, especially in the Biobío river basin. The Biobío basin has faced with multiple expansions for hydroelectric power, and at the same time providing sources for competing demands from urbanization, industry, agriculture and irrigation, forestry, aquaculture, tourism, recreation, and it is a regional domain of indigenous peoples. There is a growing unease about the current process of managing single developments with Environmental Impacts Assessment (EIA). Assessing the impacts of...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382014000200004

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

THE ADVANCED SCATTEROMETER PROCESSING SYSTEM FOR ERS DATA: THIRTEEN YEARS OF OCEAN WINDS FROM SPACE
Provedor de dados: 72
Autores: Crapolicchio,R; Lecomte,P.
Since the launch of ERS-1 in 1991 and ERS-2 in 1995, carrying a C-band Scatterometer, a data set of more than thirteen years of backscattered signal from the Earth surface is available for exploitation. With its global coverage, day or night and all-weather operation, ERS Scatterometer data offer a unique opportunity for long-term studies and research. To fulfill the needs of the scientific community, the European Space Agency (ESA) has developed the project: Advanced Scatterometer Processing System (ASPS). Main scope of the project is to provide with state of the art algorithm, high quality and homogenous Scatterometer measurements (sigma nought) of the Earth surface and high quality wind field over the Oceans by re-processing the entire ERS mission....
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200024

Estado de Conocimiento de los Anfibios de Chile
Provedor de dados: 72
Autores: Ortiz Z,Juan Carlos; Díaz-Páez,Helen.
Se entrega un resumen histórico del desarrollo de la herpetología en Chile, con una comparación desde la situación entregada por el libro de J.M. Cei en 1962, "Batracios de Chile", hasta la situación actual. Además, se entrega una síntesis de la distribución geográfica de las diferentes especies de anfibios en Chile y se indican aquellas que son compartidas con los países limítrofes. Se dan a conocer las categorías de conservación en que se encuentran las diferentes especies, las instituciones donde se guarda el material tipo y los centros de investigación donde se realiza investigación en anfibios en Chile. Finalmente se discute las áreas deficitarias del conocimiento de este taxón.
Tipo: Journal article
Palavras-chave: Anfibios; Lista sistemática; Conservación; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000100017

VARIABILITY OF SUBPOLAR NORTH ATLANTIC CIRCULATION FROM ALTIMETRY
Provedor de dados: 72
Autores: Häkkinen,Sirpa; Rhines,Peter B.
Altimeter data show that subpolar North Atlantic sea surface height has underwent large variations during the last two decades. Similarly the associated geostrophic velocity field exhibits large fluctutations in the strength of the subpolar gyre circulation such that the gyre was extremely strong in the early 1990's but may have been weaker in the late 1990s than in the late 1970s and 1980s. Numerical model experiments suggests that the 1990s had also large coincident changes in the meridional overturning in the North Atlantic Ocean
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200048

OPLOPHORIDAE (DECAPODA, CARIDEA) IN SOUTEASTERN PACIFIC OCEAN: REVISION OF CHILEAN SPECIES
Provedor de dados: 72
Autores: Guzmán,Guillermo L.
The species of the family Oplophoridae of Chile are reviewed. Nine new records are given. Four of these for first time to Southeastern Pacific Ocean: Acanthephyra trispinosa Kemp 1939, Sysytellapsis braueri (Balss 1914) Ephyrina ombango Crosnier &amp;amp; Forest 1973 and Oplophorus spinosus (Brullé 1839). The family Oplophoridae is composed by 16 species in the Southeastern Pacific waters, including these new records
Tipo: Journal article
Palavras-chave: Decapoda; Oplophoridae; Zoogeography; Southeastern Pacific; Chile.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000100007

EL PUYE GALAXIAS GLOBICEPS EIGENMANN 1927 (OSTEICHTHYES: GALAXIIDAE):: ¿UNA ESPECIE EN PELIGRO DE EXTINCION?
Provedor de dados: 72
Autores: Murillo H.,Vladimir; Ruiz,Víctor H.
La familia Galaxiidae está representada, en Chile, por cinco especies. El estado del conocimiento de ellas es en general escaso, excepto en el caso de G. maculatus debido a que ha adquirido un gran interés económico. Por otro lado, G. globiceps es la menos estudiada debido a que sólo ha sido registrada en dos localidades, en Los Alerces, cerca de Puerto Montt, la localidad tipo, y en la Isla de Chiloé. El último registro, de sólo un espécimen, en el Parque Nacional Chiloé refuerza la idea anterior de su escasez y rareza en el sur de Chile. El objetivo de este estudio es reevaluar el estado de conservación de G. globiceps, a través de la revisión, de los trabajos sobre peces de aguas continentales en Chile. La conclusión general de este trabajo establece...
Tipo: Journal article
Palavras-chave: G. globiceps; Galaxiidae; Estado de Conservación; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200013

Primer registro de Vespula vulgaris (Linnaeus 1758) (Hymenoptera: Vespidae) en la isla Navarino, Chile
Provedor de dados: 72
Autores: RENDOLL CÁRCAMO,JAVIER; CONTADOR,TAMARA; CREGO,RAMIRO D.; JORDÁN,NATALIA I.; SCHÜTTLER,ELKE; GAÑÁN,MELISA; JIMÉNEZ,JAIME E.; ROZZI,RICARDO; MASSARDO,FRANCISCA; KENNEDY,JAMES H.
La avispa común Vespula vulgaris (Linnaeus 1758) es una especie introducida en el Hemisferio Sur que ha sido registrada en Australia, Nueva Zelanda, Tasmania, Argentina y Chile central. Este trabajo documenta la presencia de V. vulgaris en la isla Navarino, Reserva de la Biósfera Cabo de Hornos, sur de Chile.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000100014

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

Seasonal limnetic feeding regime of the “robalo” Eleginops maclovinus (Valenciennes 1830), in the Valdivia river, Chile
Provedor de dados: 72
Autores: Pequeño,Germán; Pavés,Héctor; Bertrán,Carlos; Vargas-Chacoff,Luis.
The “robalo” Eleginops maclovinus (Valenciennes 1830) is a common fsh in the littoral, estuaries and rivers (under tidal effects zone) of southern South América, including the Falkland islands. The feeding habits of this species is known mainly in the two frst mentioned habitats, where it consumes mostly animals from marine and estuarine origin. However, little is known about its seasonal feeding habits in limnetic environments. It is only assumed that it has to eat preys from freshwater origin. In the present study, 127 specimens of E. maclovinus were analysed, 119 of which had stomach contents. The zoophagic tendency of the species is corroborated, but also animáis from low salinities and limnetic salinities were found to be consumed inthe freshwater...
Tipo: Journal article
Palavras-chave: Feeding; Seasonality; Eleginopsidae; Physiological versatility; Chile; Alimentación; Estacionalidad; Eleginopsidae; Versatilidad fisiológica; Chile.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100008

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

Estudio taxonómico del género Paraxeropsis Camousseight, 2008 (Insecta, Phasmatodea), con la descripción de P. camousseighti n. sp.
Provedor de dados: 72
Autores: Vera,Alejandro.
Se describen los imagos de ambos sexos y el huevo de Paraxeropsis camousseighti n. sp., además se entregan observaciones biológicas, sobre la base de especímenes colectados en Chile, en una única localidad de la costa de la Región del Maule. Su descubrimiento permite complementar la diagnosis original del género, discutir la morfología genital y compararla con otras especies de fásmidos recientemente estudiadas.
Tipo: Journal article
Palavras-chave: Chile; Heteronemiidae; Morfología; Taxonomía.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000100005

ESTUDIO POBLACIONAL DEL RECURSO ANCHOVETA (ENGRAULIS RINGENS JENYNS 1842) (CLUPEIFORMES, ENGRAULIDAE), MEDIANTE ANALISIS DE ADN
Provedor de dados: 72
Autores: Ferrada,Sandra; Hernández,Klaudia; Montoya,R.; Galleguillos,Ricardo.
Se estudió la variabilidad de 2 genes nucleares, el intrón 4/5 del gen de Calmodulina (CaM) por amplificación PCR y la región ITS (Internal Transcribed Spacers) del ADNr, por PCR y digestión en 139 ejemplares de E. ringens provenientes de las costas de Iquique (20°13'S; 70°09'W) y Talcahuano (36°41'S; 73°06'W). Para CaM se identificaron 8 genotipos en las muestras de Talcahuano y 7 en Iquique, presentando 1 a 3 fragmentos amplificados de 550 a 1.100 pb. En la digestión del fragmento ITS amplificado, sólo la endonucleasa TaqªI detectó 3 diferentes genotipos, 2 presentes en Talcahuano y 3 en Iquique. Se discuten las frecuencias observadas para cada gen y área de estudio. Los resultados llevan a confirmar la existencia de un solo stock, desde un punto de...
Tipo: Journal article
Palavras-chave: Engraulis ringens; ITS; CaM; Variabilidad genética; Stock.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200022

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

RECENT OBSERVATIONS ON ARCTIC OCEAN ICE THICKNESS
Provedor de dados: 72
Autores: Wadhams,Peter.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300046

VERTICAL TEMPERATURE AND MOISTURE STRUCTURE IN LOWER ATMOSPHERE RETRIVED FROM TERRA/MODIS
Provedor de dados: 72
Autores: Kim,Y. S; Kwon,B. H; Hong,K. M.
Two MODIS instruments on board the Terra and Aqua Satellites are operational for global remote sensing of the land, ocean and atmosphere. Atmospheric sounding data with a high spatial resolution from MODIS will provide a wealth of useful information. The vertical air temperature and moisture data were retrieved using the MODIS data, and compared with the radiosonde data obtained in the Korean Peninsula. The correlation coefficients are 0.99 and 0.89 for air temperature and moisture cases, respectively. Air temperature data were relatively good agreement, but the moisture data from MODIS were underestimated
Tipo: Journal article
Palavras-chave: MODIS; Radiosonde; Vertical profile.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200058

SURFACE CURRENT MAPPING OFF CALIFORNIA WITH RADIOMETRY AND ALTIMETRY
Provedor de dados: 72
Autores: Emery,W; Matthews,D; Crocker,R; Baldwin,D.
Surface coastal currents off California are a good example of the complex variability in space and time of currents in an ocean basin eastern boundary. Conventional oceanographic measurements are unable to resolve these relatively small scale variations but by employing both satellite imagery and satellite altimetry we are able to resolve this complex structure and its variations in space and time. Moreover using historical satellite imagery we are able to extend this study back into the past. Our emphasis will be on resolving these variations and later studies will relate these variations to various forcing functions
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200032

PRIMEROS REGISTROS PARA CHILE DE DOS ESPECIES DE PILOBALIA BURMEISTER, 1875 (COLEOPTERA, TENEBRIONIDAE)
Provedor de dados: 72
Autores: Ferrú,Marcos A; Pizarro-Araya,Jaime.
In the present work, the first Chilean records of Pilobalia torresi Molinari, 1968 and Pilobalia escobari Peña, 1973 (Coleoptera: Tenebrionidae: Nycteliini) are reported. The specimens were collected by hand in Colchane (19° 16´ 60´´ S, 68° 37´ 60´´ W), in the Altiplano of the Region of Tarapacá, Chile. A redescription of the species and an environmental characterization of the collection sites are provided
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100013

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

Mechanisms controlling the suboxic layer of the black sea
Provedor de dados: 72
Autores: Oguz,Temel.
The Black Sea is a classic anoxic ocean basin resembling the earth's ancient oceanic conditions. Its present structure has evolved during the last 2.5 billion years, and is characterized by a well-defined sub-oxic zone at the interface between the oxic and sulfidic layers where many important bacterially-mediated redox reactions occur. The sub-oxic zone involves extremely low oxygen and sulfide concentrations with no perceptible vertical gradients. This is due to very strong density stratification along the sub-oxic and anoxic layers, which markedly restricts the downward flux of oxygen and upward flux of chemical properties and therefore maintains a stable structure with some inter-annual variations. The upper layer biogeochemical structure above the deep...
Tipo: Journal article
Palavras-chave: Black Sea; Ancient ocean conditions; Sub-oxia; Anoxia; Nitracline.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300012

Las grandes bacterias del Sulfureto de Humboldt
Provedor de dados: 72
Autores: Gallardo,Víctor Ariel; Espinoza,Carola; Fonseca,Alexis; Musleh,Selim.
Durante el primer estudio nacional de la zona de mínimo oxígeno (ZMO) y del macrobentos animal costa afuera del norte de Chile (1962), se descubrió una comunidad bentónica compuesta de bacterias filamentosas multicelulares gigantes en los sedimentos fuertemente reducidos entre 50 y182 m. La masiva abundancia de filamentos bacterianos visibles a simple vista y el extremadamente escaso macrobentos animal, fueron rasgos inesperados. Más recientemente (2004) un nuevo ensamble de bacterias filamentosas multicelulares más pequeñas fue descubierto distribuido en los sedimentos más reducidos sub-superficiales del tapiz bacteriano. Hoy reconocemos que este ecosistema dominado por procariotas constituye un rasgo mayor y distinto al nivel mundial el que aquí...
Tipo: Journal article
Palavras-chave: Sulfureto; Tapetes microbianos; Micropaleontología; Astrobiología; Metabolitos secundarios.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382013000200008

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

PRESENCIA DE HETEROPSYLLA CUBANA CRAWFORD EN CHILE (HEMIPTERA: PSYLLIDAE: CIRIACREMINAE)
Provedor de dados: 72
Autores: Olivares,Tania S.; Burckhardt,Daniel H.
RESUMEN Se menciona por primera vez para Chile la especie Heteropsylla cubana Crawford asociada a Leucaena leucocephala (Lam.) de Wit. y otras Leucaena spp. (Mimosaceae) proveniente de la I Región, Azapa, Chile
Tipo: Journal article
Palavras-chave: Hemiptera; Psyllidae; Ciriacreminae; Mimosaceae; Nuevo registro.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000100012

EN EL TERCENTENARIO DE CARL VON LINNE
Provedor de dados: 72
Autores: Artigas,Jorge N.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000200001

Filogenia del género Psilaspilates (Butler 1893) (Lepidoptera: Geometridae) con la descripción de una nueva especie del bosque relicto Fray Jorge, Chile
Provedor de dados: 72
Autores: Parra,Luis E; Villagrán-Mella,Romina; Hernández,Esteban A; Hernández,Cristian E.
Se describe una nueva especie de Psilaspilates Butler 1893, P septentrionalis Parra sp. nov., proveniente del bosque relicto costero de Aextoxicon punctatum R. et R (olivillo) del Parque Nacional Fray Jorge, Región de Coquimbo, Chile. Las especies previamente reconocidas del género se distribuyen en la zona centro-sur de Chile, así P. septentrionalis sp. nov. es la única con distribución en el Norte Chico de Chile. Posteriormente, se infiere la filogenia del género Psilaspilates usando dos aproximaciones filogenéticas: criterio de parsimonia e inferencia Bayesiana. Las especies hermanas de la nueva especie, P. concepcionensis y P stygiana, se distribuyen en la zona centro-sur de Chile, en bosques costeros donde el olivillo también está presente. Planteamos...
Tipo: Journal article
Palavras-chave: Ennominae; Lithinini; Psilaspilates septentrionalis Parra sp. nov; Fragmentación; Especiación.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000200003

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

POSSIBILITIES FOR ECOHYDROLOGICAL MONITORING IN NATURAL AND MANAGED ECOSYSTEMS IN SOUTHERN CHILE
Provedor de dados: 73
Autores: Peters,Jan; Wieme,Vanessa; Boeckx,Pascal; Samson,Roeland; Godoy,Roberto; Oyarzún,Carlos; Verhoest,Niko.
Ecohydrology investigates how hydrological processes affect plant growth and vice versa. As these mutual interactions are important in many ecosystems, ecohydrology has wide applicability. An important aspect of ecohydrological research is the assessment and prediction of the occurrence of plant species or vegetation types in relation to hydrological or hydrogeochemical habitat conditions. Several models have been developed (e.g. DEMNAT, ICHORS, ITORS, ITORS-VL). All of these models are data driven. Consequently a monitoring network has to be installed, possibly in addition to existing databases. These networks are ecosystem specific but the most widely monitored variables are: water table depth, electric conductivity of groundwater, soil moisture content...
Tipo: Journal article
Palavras-chave: Ecohydrology; Modelling; Vegetation; Hydrology; Decision support systems.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200007

Revisión de las especies de Hymenophyllum (Hymenophyllaceae) del sur de Argentina y Chile
Provedor de dados: 73
Autores: Larsen,Cristian; Ponce,M. Mónica; Scataglini,M. Amalia.
Se presenta la revisión del género Hymenophyllum (Hymenophyllaceae) para la región templada de Argentina y Chile. El estudio contiene una clave para las 22 especies reconocidas dentro de la actual definición del género, incluye descripciones enmendadas, ilustraciones y mapas de distribución geográfica. Se establecen los nombres aceptados y sinónimos nuevos de los taxones, incluyendo a Serpyllopsis caespitosa e Hymenoglossum cruentum dentro del género Hymenophyllum. Se designaron lectotipos para 21 nombres. Se incluye una filogenia, basada en secuencias del gen de cloroplasto rbcL, en donde se corroboran las posiciones de especies no muestreadas hasta el momento en los subgéneros correspondientes.
Tipo: Journal article
Palavras-chave: Hymenophyllum; América austral-templada; Taxonomía; Filogenia.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200009

STELLARIA CHILENSIS PEDERSEN EN CHILE Y SU SINONIMIA
Provedor de dados: 73
Autores: Volponi,Carola Regina.
Three species of Stellaria living in Chile, S. serpens Ravenna, S. circinata Ravenna and S. concinna Ravenna are synonymized with S. chilensis. It is considered that the features taken into account by Ravenna to establish such species, mainly plant habit and morphology of styles, are within the range of variability of S. chilensis. It is considered that S. celsa do not belong to this genus.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100016

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

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

Is autotoxicity responsible for inhibition growth of new conspecific seedlings under the canopy of the invasive Acacia dealbata Link?
Provedor de dados: 73
Autores: Aguilera,Narciso; Guedes,Lubia M.; Becerra,José; González,Luis.
ABSTRACT Autotoxicity is a particular form of allelopathy and is suspected to be responsible for regulating intraspecific competition under the Acacia dealbata Link (Fabaceae) canopy. Was established a bioassay with controlled conditions following the natural patterns of plant material accumulation under the A. dealbata canopy to determine the effects of chemical compounds released by leaves, bark, flowers and pods of the invasive species on germination and early growth of conspecific seedlings. Morphological changes caused by A. dealbata plant parts in roots of A. dealbata seedlings grown in natural and controlled conditions were evaluated with scanning electron microscopy. The composition and behavior of the phytotoxicity of litter under the A. dealbata...
Tipo: Journal article
Palavras-chave: Allelopathy; Allelochemicals; Biological invasions; Intraspecific competition; Morphological changes; Non- native range.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100001

Plant growth regulators optimization for maximize shoots number in Agave americana L. by indirect organogenesis
Provedor de dados: 73
Autores: REYES-ZAMBRANO,SHEILA JAZMÍN; LECONA-GUZMÁN,CARLOS ALBERTO; BARREDO-POOL,FELIPE ALONSO; AMBROSIO CALDERÓN,JOSÉ DOLORES; ABUD-ARCHILA,MIGUEL; RINCÓN-ROSALES,REINER; RUIZ-VALDIVIEZO,VÍCTOR MANUEL; GUTIÉRREZ-MICELI,FEDERICO ANTONIO.
Current protocols for Agave americana L. micropropagation have limited commercial application due to the low number of plants produced by explant. Indirect organogenesis could be an alternative, however is necessary to optimize plant growth regulators for plantlet number maximization. The objective of this work was to optimize 2,4-dicholorophenoxyacetic acid (2,4-D) and 6-benzyl adenine (BA) concentrations on the induction of A. americana embryogenic callus from apical meristem as explant for maximized the number of shoots per callus using a response surface experimental design. MS medium containing 30 g l-1 sucrose amended with 0.11,0.18, 0.45 or 2.26 &amp;#956;M 2,4-D, and 11.0, 22.0, 38.2 or 44.0 &amp;#956;M BA was used. Nine treatments with three...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100014

WITHIN-POPULATION GENETIC DIVERSITY OF CLIMBING PLANTS AND TREES IN A TEMPERATE FOREST IN CENTRAL CHILE
Provedor de dados: 73
Autores: Torres-Díaz,Cristian; Ruiz,Eduardo; Salgado-Luarte,Cristian; Molina-Montenegro,Marco A; Gianoli,Ernesto.
The climbing habit is a key innovation in angiosperm evolution: climbing plant taxa have greater species richness than their non-climbing sister groups. It is considered that highly diversified clades should show increased among-population genetic differentiation. Less clear is the expected pattern regarding within-population genetic diversity in speciose lineages. We tested the hypothesis of greater within-population genetic diversity in climbing plants compared to trees in a temperate forest in central Chile. The assumption underlying this hypothesis is that higher among-population differentiation in climbers compared to trees should reflect higher genetic diversity as well. AFLP markers from 167 individual plants from 14 species (seven climbers and...
Tipo: Journal article
Palavras-chave: AFLP; Climbers; Evolution; Genetic variability; Key innovation.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100005

Influence of Nothofagus bark pH on the lichen and bryophytes richness, Central Chile
Provedor de dados: 73
Autores: PEREIRA,IRIS; MÜLLER,FRANK; MOYA,MARIO.
The influence of the pH of the bark of two tree species belonging at Nothofagus genus on the lichen and bryophyte richness was studied. The tree species considered for this study were: N. dombeyi and N. macracarpa situated in two pre-Andean localities; one in the "Radal Siete Tazas" National Reserve and the other in the "Altos de Lircay" National Reserve, Central Chile. In each locality, a total of 20 phorophytes were examined: 10 N. dombeyi and 10 N. obliqua. In each phorophyte, the total lichens and bryophytes were inventoried, the diameter of each one of the phorophytes was measured at breast height (DHA) and, in addition, 10 g of bark were extracted in order to check the pH. The pH of the bark was determined by means of the Mezger&amp;#8217;s method...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100012

Una reflexión en torno a la flora, vegetación y etnobotánica en Homero
Provedor de dados: 73
Autores: Villagrán,Carolina; Squizzato,Tania.
RESUMEN Este estudio constituye una contribución al conocimiento de la concepción descriptivo-mítica de la naturaleza vegetal en la época homérica, realizado sobre la base de las referencias botánicas y etnobotánicas consignadas en la Ilíada y la Odisea. El objetivo es formalizar un examen de la biodiversidad, ecología y usos de las plantas nativas y cultivadas; dimensión estética y sentido de los símiles botánicos; y claves que ofrece el poema para profundizar en el pensamiento de la geografía mítica que vertebra la visión de la naturaleza que impera en el período. El examen se realizó sobre la base de la elaboración de un Catálogo con los nombres griegos de plantas registrados en Homero, sus transliteraciones latinas, los lugares donde aparecen, los...
Tipo: Journal article
Palavras-chave: Homero; Nomenclatura; Comparaciones poético-botánicas; Plantas míticas.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100200

El manejo del suelo salino usando arena afecta el crecimiento de raíces y la sobrevivencia de plántulas de Prosopis tamarugo Phil. (Fabaceae)
Provedor de dados: 73
Autores: León,Mario F.; Silva,Sergio I.; Sandoval,Ana; Aracena,Ismael; Quiñones,Francisco; León-Lobos,Pedro.
RESUMEN La regeneración natural del árbol endémico Prosopis tamarugo es casi inexistente en la Pampa del Tamarugal, probablemente la salinidad del suelo es una barrera para el establecimiento de plántulas. Aunque existen numerosas técnicas para manejar la salinidad del suelo, la creación de un sustrato en la que suelo salino es mezclado con arena es escasamente conocido. En el presente estudio se profundizó en el efecto de tres sustratos experimentales (suelo salino natural, suelo 1:1 y suelo 1:2) en el crecimiento de raíces y supervivencia de plántulas de P. tamarugo durante un período de 50 días. El suelo 1:1 fue creado mezclando suelo natural y arena en igual proporción y el suelo 1:2, aumentado la proporción de arena al doble. Para los tres suelos se...
Tipo: Journal article
Palavras-chave: Tamarugo; Raíces; Suelo; Sodio y cloruro; Conductividad eléctrica.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100158

Novedades en Solanum y Salpichroa (Solanaceae) para Sudamérica austral
Provedor de dados: 73
Autores: Chiarini,Franco; Barboza,Gloria E; Marticorena,Alicia.
El presente artículo tiene por objeto dar a conocer novedades en dos géneros de Solanaceae: Solanum y Salpichroa. En Solanum se aclara la identidad y sinonimia de dos especies del subgen. Leptostemonum (S. bonariense y S. guaraniticum), y se reporta por primera vez la presencia de S. julocrotonoides (sect. Brevantherum) para Argentina. Para Salpichroa se documenta la presencia de este género para la flora de Chile, con 3 taxones (S. origanifolia, S. scandens y S. tristis var. lehmannii). Todas las especies son descriptas e ilustradas.
Tipo: Journal article
Palavras-chave: Solanum; Salpichroa; Argentina; Chile; Nuevos registros.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100006

GROWTH AND TOTAL CAROTENOID CONTENT IN FOUR CHILEAN STRAINS OF HAEMATOCOCCUS PLUVIALIS FLOTOW, UNDER LABORATORY CONDITIONS
Provedor de dados: 73
Autores: González,Mariela A; Cifuentes,Ana Silvia; Gómez,Patricia I.
Haematococcus pluvialis is a unicellular green microalga cultivated on a large scale as a natural source of astaxanthin, a ketocarotenoid of high commercial value due to its colorant and antioxidant properties. The aim of this study was to compare growth and total carotenoids among four strains of H. pluvialis isolated from different microhabitats in two geographical locations in Chile. Growth was carried out under autotrophic and mixotrophic conditions and under two photon flux densities (PFD) (20 and 85 umol nrV¹). Total carotenoid content was estimated on day 45. Most of the strains grew better under the autotrophic conditions; the highest exponential growth rates were exhibited at the high PFD in all the strains (ranging from 0.73 to 1.20 div day"¹)...
Tipo: Journal article
Palavras-chave: Batch culture; Haematococcus pluvialis; Intraspecific physiological differences.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100006

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

GERMINACION DE LA ESPORA,MORFOLOGIA DEL GAMETOFITO Y EXPRESION SEXUAL DE POLYPODIUM FEUILLEI BERTERO (POLYPODIACEAE)
Provedor de dados: 73
Autores: Gabriel y Galán,Jose María; Prada,Carmen; Rolleri,Cristina H.
En este trabajo se estudia el desarrollo morfológico y la expresión sexual de los gametófitos de Polypodium feuillei. Se emplearon cultivos multisporos en agar nutritivo para sembrar esporas. En menos de tres semanas se observó germinación vigorosa, alcanzándose porcentajes del 78%, siendo el patrón de germinación del tipo Vittaria. El gametófito de P. feuillei presenta una fase filamentosa alargada, cuyo crecimiento se prolonga durante unas dos semanas, seguida de una fase laminar. Hacia la décima semana tras la germinación, los gametófitos alcanzan la forma cordado-alada y presentan abundantes pelos en los márgenes y en la superficie abaxial de la lámina antes de la madurez. Este modelo ontogénico de desarrollo se ajusta al tipo Drynaria. En su madurez,...
Tipo: Journal article
Palavras-chave: Polypodium feuillei; Espora; Gametófito; Morfología; Expresión sexual.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100002

Macropropagación de Paulownia elongata x fortunei a partir de esquejes de raíz en la Región del Biobío, Chile
Provedor de dados: 73
Autores: RIFFO,GERSON; MUÑOZ,FERNANDO; URIBE,MATILDE; CANCINO,JORGE; ACUÑA,EDUARDO; RUBILAR,RAFAEL.
El cultivo de Paulownia fue recientemente introducido en Chile. En esta investigación se presentan resultados de la propagación vegetativa del híbrido Paulownia elongata x fortunei, utilizando esquejes de raíz. El objetivo de este trabajo fue determinar la capacidad de los esquejes de raíz del híbrido P. elongata x fortunei de formar brotes adventicios para obtener nuevas plantas, que conserven el genotipo y las características del híbrido mediante una técnica más sencilla y de menor costo. Para ello se utilizaron esquejes de raíz de plantas de un año de edad, obtenidos desde plantaciones experimentales, con el propósito de estudiar el comportamiento de la propagación según tres variables: diámetro de esqueje (tres niveles), tipo de sustrato (dos niveles)...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100009

RIQUEZA FLORISTICA DEL SANTUARIO DE LA NATURALEZA PALMAR EL SALTO, VIÑA DEL MAR, REGION DE VALPARAISO, CHILE
Provedor de dados: 73
Autores: Flores-Toro,Lorena; Aguirre-Saavedra,Francisco.
El Santuario de la Naturaleza Palmar El Salto alberga la tercera población de Jubaea chilensis (Molina) Baillon (Palma chilena), más numerosa del país. El objetivo de este trabajo es contribuir al conocimiento de la flora presente en el Santuario. Se trabajó con 30 censos de vegetación levantados con la metodología fitosociológica de la escuela de Zurich-Montpellier. La flora está compuesta por 234 especies. En la flora domina el elemento endémico con 92 especies. Las más importantes en el palmar son: Nassella chilensis (Trin.) E.Desv., Chusquea cumingii Nees, Retanilla trinervia (Gillies et Hook.) Hook. et Arn. y Jubaea chilensis, todas autóctonas. Destaca la presencia de nueve especies con problemas de conservación, la mayoría vulnerables a la extinción.
Tipo: Journal article
Palavras-chave: Palmares; Flora; Endemismo.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100007

Producción de carbón vegetal a partir de arbustos nativos en la Región de Atacama, Chile
Provedor de dados: 73
Autores: Estevez,Rodrigo A; Squeo,Francisco A; Arancio,Gina; Erazo,Manuela B.
La producción de carbón vegetal a partir de arbustos leñosos es una de las principales amenazas para la vegetación nativa en zonas áridas. En este trabajo se estima la producción de carbón en la provincia de Huasco, al sur de la Región de Atacama, y se identifican las principales especies utilizadas en este proceso. Se detectaron 21 puntos de venta de carbón nativo en el área de estudio. En cada uno de ellos se recolectaron muestras del carbón comercializado, las que fueron posteriormente comparadas con muestras de referencia. Se realizaron 28 entrevistas a vendedores, productores de carbón nativo e informantes claves, para estimar el volumen de producción anual. Se identificaron 4 sitios productivos en la zona de estudio, tres de ellos entre Vallenar y El...
Tipo: Journal article
Palavras-chave: Adesmia; Balsamocarpon; Fabiana; Amenaza a la biodiversidad; Zonas áridas.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200007

XYLEMANATOMYOF BETULAPENDULA ROTHSAPLINGS: RELATIONSHIP TO PHYSICAL VASCULAR MODELS
Provedor de dados: 73
Autores: Átala,Cristian; Lusk,Christopher H.
In conifers and diffuse-porous angiosperms, tracheary elements have an important role in structural support and water transport. In these plants it is expected that the conflict between the mechanic and hydraulic function will result in less efficient water transport at the whole plant level than the expected for plants whose conduits do not fulfil a mayor structural role (vines and ring-porous trees). Here we analyse the vascular architecture of Betula péndula saplings in order to examine predictions for diffuse-porous trees. Murray's law (conservation of Zr³) was not supported in basal tissues where the mechanical demands are be greater. Although distal portions did not depart significantly from Murray's law, lower exponents better described the...
Tipo: Journal article
Palavras-chave: Murray's law; Plant vascular models; Water transport models; Vascular anatomy.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100004

Revisión del género Valeriana (Valerianaceae) en Sudamérica austral
Provedor de dados: 73
Autores: KUTSCHKER,ADRIANA.
El género Valeriana es el más diverso de la familia Valerianaceae y se encuentra ampliamente distribuido en las zonas templadas del hemisferio norte, África y Sudamérica, presentando en la región andina un importante centro de diversificación secundaria. Este trabajo comprende la revisión de las especies de Sudamérica austral sobre la base de material de Argentina y Chile desde los 33°S hasta los 55°S. Se describen 40 especies de Valeriana de esta región, se citan ilustraciones ya publicadas y se incluye una clave para identificarlas. Se incluyen sinonimias nuevas basadas en el estudio de los tipos nomenclaturales y se lectotipifican varios taxones. Se hace referencia a las características distintivas de cada especie, su fenología, distribución geográfica...
Tipo: Journal article
Palavras-chave: Argentina; Chile; Taxonomía; Valeriana; Sinónimos; Lectotipificación.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200016

Genetic diversity of Chondrostereum purpureum (Pers.) Pouzar causing silverleaf disease on blueberries in Chile
Provedor de dados: 73
Autores: Rojo,Carmen; Becerra,Viviana; France,Andrés; Paredes,Mario; Buddie,Alan; Balzarini,Monica.
ABSTRACT Blueberry (Vaccinium corymbosum L.) in Chile is being affected by silver disease whose causative agent is Chondrostereum purpureum (Pers.) Pouzar. This fungus causes a decrease in the yield of the fruit and the death of the plant. So far, this disease has not been reported in the literature attacking blueberry plants in Chile. The main objective of this research was to characterize genetically the populations of Ch. purpureum at molecular level using the ITS-RFLP markers. The results of the ITS-RFLP indicate a low level of diversity in the Chilean populations of Ch. purpureum. When analyzing the isolates collected in blueberry, two large groups were configured in the dendrogram. The first one grouped 49 isolates with the same molecular profile and...
Tipo: Journal article
Palavras-chave: Chondrostereum purpureum; ITS-RFLP diversity; Molecular markers.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100176

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

Extubocellulus spinifer (Hargraves &amp;amp; Guillard) Hasle, Stosch &amp;amp; Syvertsen (Cymatosiraceae, Bacillariophyceae): First report of the species from the Southeastern Pacific with comments on the variability of some of its morphological features
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola; Inostroza,Ingrid.
During the taxonomic analysis of strains from marine phytoplankton samples, it was found that a sample contained isolated or short chains of 2-4 small cells. Observations under the electron microscopes revealed the presence of Extubocellulus spinifer (Hargraves &amp;amp; Guillard) Hasle, Stosch &amp;amp; Syvertsen, a minute species until now not reported for the Southeastern Pacific Ocean. In this paper we describe the characteristics of the Chilean cells, comment on the variability of some of its morphological features, and discuss about the differences between the two known species of the genus.
Tipo: Journal article
Palavras-chave: Diatom; Morphology; Taxonomy; Distribution; Chile.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200001

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

Rinodina pyrina (Physciaceae, Ascomycota) new to Chile
Provedor de dados: 73
Autores: Vargas Castillo,Reinaldo; Ibaceta,Aissa; Vergara,Evelyn.
Rinodinapyrina (Ach.) Arnold es citada por primera vez para la micobiota liquenizada chilena. El material fue recolectado en el sector El Panul, en la precordillera de la ciudad de Santiago, Chile. La morfología, anatomía y química fueron revisadas y se entrega una descripción del material encontrado, su hábitat y distribución.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200018

First report of Erysiphe convolvuli on Convolvulus arvensis and Calystegia sepium in Chile with a description of the sexual state
Provedor de dados: 73
Autores: HENRÍQUEZ S,JOSÉ LUIS; ALARCÓN C,PAULA; SANDOVAL L,PABLO.
La correhuela (Convolvulus arvensis L.) es una planta cosmopolita, ampliamente distribuida en Chile y considerada como una maleza de importancia en cultivos agrícolas. Por muchos años se ha observado la presencia de un oídio creciendo profusamente sobre sus hojas y tallos pero, recientemente, en el otoño de 2010 se observó por primera vez el teleomorfo de este hongo. Se realizó una prospección de plantas sintomáticas encontrándose la forma sexual del oídio desde la Región de Coquimbo hasta la Región del Libertador Bernardo O'Higgins. El patógeno fue identificado como Erysiphe convolvuli var. convolvuli, el cual no había sido reportado anteriormente en el país. Muestreos realizados en el otoño de 2012 permitieron determinar, además, la presencia de Erysiphe...
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200015

IMPORTANCIA DEL CARIOTIPO EN LA TAXONOMIA Y EVOLUCION DEL GENERO CHAETANTHERA (ASTERACEAE): EVIDENCIAS PRELIMINARES PARA ESPECIES QUE CRECEN EN CHILE
Provedor de dados: 73
Autores: Baeza,Carlos; Ruiz,Eduardo; Negritto,María A.
El género Chaetanthera es exclusivamente sudamericano y comprende cerca de 42 especies. A pesar de ser un género aparentemente bien estudiado desde el punto de vista taxonómico, existen discrepancias con los estudios evolutivos. El trabajo taxonómico más reciente del género es el publicado por Cabrera en 1937, donde se reconocen siete subgéneros sobre la base del hábito y de las características de las brácteas del involucro. Sin embargo, en el único estudio filogenético que existe sobre el género, indican que la mayoría de estos grupos infragenéricos son parafiléticos. En el presente trabajo se dan a conocer las características cariotípicas de Chaetanthera moenchioides y se compara esta información con la que se ha obtenido anteriormente para otras cinco...
Tipo: Journal article
Palavras-chave: Chaetanthera; Cariotipo; Evolución.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100005

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

Origen del nombre de los géneros de plantas vasculares nativas de Chile y su representatividad en Chile y el mundo
Provedor de dados: 73
Autores: MUÑOZ-SCHICK,MÉLICA; MOREIRA-MUÑOZ,ANDRÉS; MOREIRA ESPINOZA,SERGIO.
La presente contribución constituye un aporte al conocimiento de la flora vascular de Chile, reuniendo en un solo texto la información acerca del significado del nombre de los géneros chilenos de plantas vasculares. Para ello se ha actualizado la lista de géneros nativos válidos a la fecha y se ha recopilado la información eminentemente dispersa en relación con el origen de los nombres. Adicionalmente se incluye información relevante acerca de la distribución de cada género y el número de especies nativas presentes en Chile.
Tipo: Journal article
Palavras-chave: Flora de Chile; Géneros nativos; Etimología; Distribución geográfica; Número de especies.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200011

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

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

LECTOTYPIFICATIONS IN TAXA OF THE GENERA CALAMAGROSTIS, DEYEUXIA, AND DIGITARIA (POACEAE)
Provedor de dados: 73
Autores: Vega,Andrea S; Rúgolo de Agrasar,Zulma E.
Twenty one taxa of the genera Calamagrostis Adans., Deyeuxia Clarion ex P. Beauv., and Digitaria Haller emend. A. S. Vega &amp;amp; Rúgolo are herein lectotypified on the basis of specimens and fragments obtained from original material deposited at Berlin-Dahlem (B) and La Molina (MOL) herbaria.
Tipo: Journal article
Palavras-chave: Calamagrostis; Deyeuxia; Digitaria; Lectotypes; Poaceae.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100004

Sporophytes in the genus Saitobryum (Pottiaceae, Bryophyta)
Provedor de dados: 73
Autores: Suárez,Guillermo M; Schiavone,María M; Zander,Richard H.
Se presenta una detallada descripción de Saitobryum lorentzii para Argentina, la que representa una enmienda de la diagnosis original de la especie y el género. Los caracteres esporofíticos son ilustrados por primera vez a través de fotomicrografías. Saitobryum lorentzii se diferencia por sus hojas ovadas a obovadas, la zona central de la lámina media pluripapilosa, cápsula púrpura, cilíndrica, sin peristoma y el cuello poco diferenciado.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100011

LAS ESPECIES ARGENTINAS DE CROTALARIA (LEGUMINOSAE - CROTALARIEAE): NOVEDADES, DESCRIPCIONES Y CLAVE
Provedor de dados: 73
Autores: Gómez-Sosa,Edith.
El género Crotalaria L. tiene 12 especies en el área subtropical de Argentina. Se citan por primera vez cinco especies para el país, de las cuales cuatro son nativas: C. balansae Micheli, C. maypurensis Kunth., C. paulina Schrank y C. tweediana Benth.; y una especie introducida: C. spectabilis Roth. Todas las especies se describen e ilustran, incluyéndose información sobre distribución geográfica, observaciones ecológicas y usos. Se incluye una clave para diferenciar las especies nativas y naturalizadas presentes en Argentina.
Tipo: Journal article
Palavras-chave: Taxonomía; Crotalaria; Leguminosae; Argentina.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100006

Senecio guatulamensis, nueva especie de Asteraceae endémica de Chile
Provedor de dados: 73
Autores: MUÑOZ-SCHICK,MÉLICA; MOREIRA-MUÑOZ,ANDRÉS; DE TRENQUALYE,ALAIN.
A new species of Senecio is described, on the basis of recent prospections in the Andes of Limarí valley, Coquimbo Region. The new species pertains to the Senecio section, series Andina. Differences with allied taxa are discussed.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100020

TWO NEW SUBSPECIES OF TROPAEOLUM (TROPAEOLACEAE) FROM THE IV REGION (COQUIMBO), CHILE
Provedor de dados: 73
Autores: Watson,John M.; Flores,Ana R.
Two new subspecies of Tropaeolum hookerianum Barn. are described. Apart from T. hookerianum subsp. austropurpureum presented here, only one other Andean-Pacific temperate Tropaeolum, T. azureum Bert. ex Colla, has blue to purple flowers. The second taxon, T. hookerianum subsp. pilosum, is distinguished by pilose pedicels, a feature unique among Andean-Pacific temperate species. Both novelties are Chilean endemics restricted to the IV Region (Coquimbo), as also is the nominate subspecies. All three are allopatric, and considered together extend the species' range to the north, to the south and to the east. Their characters and interrelationships pose implications for Tropaeolum evolution which are likely to be of interest to exponents of phylogenetics...
Tipo: Journal article
Palavras-chave: Tropaeolum L.; Flora of Chile; Coquimbo; Endemics; New taxa.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100005

Leaf micromorphology and anatomy of Myrceugenia rufa (Myrtaceae). An endemic coastal shrub of north-central Chile
Provedor de dados: 73
Autores: RETAMALES,HERNÁN A.; CABELLO,ANGEL; SERRA,MARÍA TERESA; SCHARASCHKIN,TANYA.
Species of fleshy-fruited Myrtaceae are generally associated with humid environments and their vegetative anatomy is mainly mesophytic. Myrceugenia rufa is an endemic and rare species from arid zones of the coast of central Chile and there are no anatomical studies regarding its leaf anatomy and environmental adaptations. Here we describe the leaf micromorphology and anatomy of the species using standard protocols for light and scanning electron microscopy. The leaf anatomy of M. rufa matches that of other Myrtaceae, such as presence of druses, schizogenous secretory ducts and internal phloem. Leaves of M. rufa exhibit a double epidermis, thick cuticle, abundant unicellular hairs, large substomatal chambers covered by trichomes and a dense palisade...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100010

Revisión de Megalachne Steud. (Poaceae: Pooideae: Poeae), género endémico del Archipiélago de Juan Fernández, Chile
Provedor de dados: 73
Autores: Peña,Carol M.; Negritto,María A.; Ruiz,Eduardo; Baeza,Carlos M.; Finot,Víctor I.
RESUMEN Megalachne Steud. (Poaceae: Pooideae: Poeae) es un género endémico del Archipiélago de Juan Fernández, Chile, para el cual se conoce hasta ahora sólo dos especies: M. berteroniana Steud. y M. masafuerana (Skottsb. &amp; Pilg.) Matthei. Durante la revisión del género se determinó la existencia de una nueva especie, M. robinsoniana nov. sp. Se entregan descripciones, ilustraciones, material estudiado y una clave para distinguir las especies.
Tipo: Journal article
Palavras-chave: Chile; Poaceae; Megalachne robinsoniana; Nueva especie.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100189

XIII REUNIÓN ANUAL DE LA SOCIEDAD BOTÁNICA DE CHILE
Provedor de dados: 73
Tipo: Journal article
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100005

ESTUDIOS TAXONÓMICOS EN EL GÉNERO FESTUCA L. (POACEAE) DE ARGENTINA Y CHILE
Provedor de dados: 73
Autores: Ospina González,Juan Camilo; Aliscioni,Sandra S; Denham,Silvia S.
En esta contribución se analiza la variación morfológica en el complejo de especies relacionadas a Festuca chrysophylla por medio de análisis estadísticos multivariados de caracteres morfológicos y anatómicos. Se describe la morfología de F. chrysophylla, se establecen sus sinónimos y se actualiza su distribución geográfica. Se establece un nuevo sinónimo: F. orthophylla bajo F. chrysophylla. Asimismo, sobre la base del estudio de material de herbario se registra por primera vez la presencia de Festuca werdermannii para Argentina, hasta ahora sólo conocida para Chile. Se describe detalladamente la anatomía foliar para ambas especies sobre la base del estudio de numerosos ejemplares. Se seleccionan lectotipos para F. chrysophylla y para F. deserticola var....
Tipo: Journal article
Palavras-chave: Flora Cono Sur; Análisis multivariados; Anatomía; Morfología.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100001

New insights on the mistletoe Tristerix aphyllus (Loranthaceae): interaction with diurnal and nocturnal frugivorous species
Provedor de dados: 73
Autores: LUCERO,FRANCISCO; BOTTO-MAHAN,CAREZZA; MEDEL,RODRIGO; FONTÚRBEL,FRANCISCO E.
Se estudiaron los visitantes de las infrutescencias de Tristerix aphyllus, un muérdago parásito de cactáceas. La mayoría de los visitantes fueron aves diurnas (cinco especies), especialmente el dispersor legítimo Mimus thenca. También se registraron dos especies de pequeños mamíferos nocturnos, llamando la atención el marsupial Thylamys elegans, cuyo rol como dispersor es aún desconocido.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200010

Impact of mycorrhizae and irrigation in the survival of seedlings of Pinus radiata D. Don subject to drought
Provedor de dados: 73
Autores: ATALA,CRISTIAN; MUÑOZ-CAPPONI,EDGARDO; PEREIRA,GUILLERMO; NAVARRETE,EDUARDO; OSES,RÓMULO; MOLINA-MONTENEGRO,MARCO.
In drought condition, plants increase survival chance by adjusting their functional traits and by biological associations. Mycorrhizae association and artificial watering have been shown to increase plant survival under drought, especially at early developmental stages when plants are more susceptible. In Chile, Pinus radiata is the most important forest species. It is grown mainly in Central Chile, where precipitations are predicted to drop in 40% and change in frequency in the future due to climate change. Rhizopogon luteolus is an ectomycorrhizae usually associated with Pinus species and has been found to increase drought tolerance. We addressed the effect of R. luteolus inoculation on survival and functional traits of P. radiata seedlings exposed to...
Tipo: Journal article
Palavras-chave: Pinus radiata; Rhizopogon luteolus; Climate change; Ectomycorrhizae; Drought tolerance.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200009

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

Valeriana moyanoi Speg. (Valerianaceae), nuevo registro para la flora de Chile
Provedor de dados: 73
Autores: Saldivia,Patricio; Rojas,Gloria.
Valeriana moyanoi Speg. (Valerianaceae), known until today just for the Argentinean flora, was collected for the first time in Chile in two places of the XI Region of Aysén; Cerro Rosado and the Jeinimeni Lake National Reserve. This study includes a description of the species, its Chilean-Argentinean distribution, habitat and associate species
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000200006

Flora vascular y musgos en la zona altoandina de la Isla Navarino (55°S), Reserva de la Biosfera Cabo de Hornos, Chile
Provedor de dados: 73
Autores: Méndez,Manuela; Rozzi,Ricardo; Cavieres,Lohengrin.
Se realizó un estudio donde se identificaron las especies de plantas vasculares y musgos presentes en el Cerro Bandera. Puerto Williams (55°S) Chile y se observaron los patrones de distribución entre una ladera de exposición ecuatorial y una ladera de exposición polar, y entre microhábitats dentro de cada ladera. Se registró un total de 52 especies, de las cuales 34 corresponden a musgos y 18 a plantas vasculares. Se encontraron diferencias en las preferencias de laderas y de microhábitats entre las distintas especies. Además se evidenció que las preferencias de microhábitats de los musgos fueron muy distintas a las de las plantas vasculares en ambas laderas.
Tipo: Journal article
Palavras-chave: Altoandino; Asociaciones positivas; Musgos; Sub-Antártico.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200011

El cariotipo de Chaetanthera linearis Poepp. (Asteraceae)
Provedor de dados: 73
Autores: Baeza,Carlos M; Ruiz,Eduardo; Novoa,Patricio; Negritto,María A.
The karyotype of Chaetanthera linearis var. linearis from Chile was examined. The species has 2n = 2x = 22 chromosomes, with 9m + 1st + 1 st-sat chromosomes. The reported karyotype is symmetric (AsK % = 58.0, TF % = 42.0 and Syi % = 72.4). The karyotype of this species was compared with Ch. microphylla var. microphylla a very similar species in morphology and distribution to Ch. linearis var. linearis, but with clearly differentiated karyotype.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100008

Estudios citogenéticos y de contenido de ADN en Brasiliopuntia schulzii (Cactaceae)
Provedor de dados: 73
Autores: LAS PEÑAS,MARÍA LAURA; SANTIÑAQUE,FEDERICO; LÓPEZ-CARRO,BEATRIZ; STIEFKENS,LAURA.
RESUMEN Se determinaron número cromosómico, cariotipo, patrones de bandeo, localización de genes ribosómicos y contenido de ADN nuclear, en dos poblaciones de Brasiliopuntia schulzii (Cactaceae, subfam. Opuntioideae). La especie resultó diploide (2n=22), presentó una fórmula cariotípica de 10 m + 1 sm. El bandeo cromosómico CMA/DAPI reveló la presencia de un par cromosómico con una banda CMA+/DAPI- asociada a NORs. Con la técnica de FISH se observó que los loci 18-5,8-26S fueron consistentes con los bloques CMA+/DAPI-/NORs. La señal para el gen 5S se localizó en el cuarto par m en una región telomérica. En las dos poblaciones el análisis de contenido de ADN reveló una mezcla de núcleos con tres picos de 2C, 4C y 8C. Esto indicaría un proceso de...
Tipo: Journal article
Palavras-chave: Brasiliopuntia; Cariotipo; Contenido de ADN; Endopoliploidía; Heterocromatina; Genes ribosomales.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200414

El cariotipo fundamental de Alstroemeria versicolor Ruiz et Pav. (Alstroemeriaceae)
Provedor de dados: 73
Autores: BAEZA,CARLOS M; ESPEJO,JAIME; RUIZ,EDUARDO.
The karyotype of Alstroemeria versicolor Ruiz et Pav. from Chile was described. The species has a karyotype 2n = 2x = 16, and the haploid formula was 1m + 3sm + 1st + 2st-sat + 1t. The reported karyotype is asymmetric (AsK % = 65.9 and Syi = 51.8%). The results are discussed including data of others species.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200023

VARIABILIDAD EN RASGOS POLINICOS EN EL COMPLEJO MIMULUS LUTEUS L. (PHRYMACEAE) EN CHILE CENTRAL
Provedor de dados: 73
Autores: Carvallo,Gastón; Ginocchio,Rosanna.
We quantified the variability of pollen morphology and life history traits among three natural populations of two taxa in the Mimulus luteus complex and a group of putative hybrids that coexist in the Andean ranges of central Chile. Pollen grain production and polar/equatorial length ratio, an index of pollen grain morphology, differed significantly among the taxa. The differences detected in these generally conservative traits, may reflect introgression, known to be common in Mimulus
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000200004

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

Morfología del cariotipo de Luma apiculata (DC.) Burret (Myrtaceae)
Provedor de dados: 73
Autores: Jara-Seguel,Pedro; Cárcamo-Fincheira,Paz; Palma-Rojas,Claudio; von Brand,Elisabeth.
Luma apiculata (DC.) Burret, had a symmetric karyotype, with 2n = 22 small sized chromosomes, ranging between 2.2 &amp;#956;&amp;#951;&amp;#953; and 0.8 &amp;#956;&amp;#951;&amp;#953;. The haploid karyotype formula was 9m + 2sm = 11. These karyotype characteristics of L. apiculata are a common character within Myrtaceae.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200017

OBSERVACIONES SOBRE LA FLORA Y VEGETACION DE DOS TURBERAS EN LA REGION DE AISEN, PATAGONIA CHILENA
Provedor de dados: 73
Autores: Teneb,Ernesto; Gómez,Patricia; González,Mariela.
We report results of flora and vegetation in two of Sphagnum peatbogs in the Aisén Region.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200009

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

FLORA VASCULAR DEL PARQUE FUTANGUE, REGIÓN DE LOS RÍOS (CHILE)
Provedor de dados: 73
Autores: Moreno,Ricardo; Le Quesne,Carlos; Díaz,Iván; Rodríguez,Roberto.
Se presentan los resultados del primer estudio florístico del Parque Futangue, un Área Silvestre Protegida (ASP) de los Bosques Templados del Sur de Sudamérica (BTSS), ubicado en la Cordillera de los Andes (40° 25' S; 72° 16' O), próximo al complejo volcánico Puyehue-Cordón del Caulle, Región de Los Ríos. Se identificaron 295 especies, pertenecientes a 91 familias y 165 géneros. Este parque representa una muestra importante de los BTSS (ca. 40-70%). La flora de Futangue se caracteriza por un 66% de las especies de origen nativo, 8% catalogadas con problemas de conservación, con un 19% de especies endémicas de Chile. La riqueza de especies superó lo esperado con respecto a otras áreas silvestres cercanas. La escasa proporción de especies introducidas y la...
Tipo: Journal article
Palavras-chave: Diversidad; Representatividad; Endemismo; Estado de conservación.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100013

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

Variación del crecimiento en vivero entre procedencias de Pinus pseudostrobus Lindl.
Provedor de dados: 73
Autores: VILLEGAS-JIMÉNEZ,DANIEL E; RODRÍGUEZ-ORTIZ,GERARDO; CHÁVEZ-SERVIA,JOSÉ L; ENRÍQUEZ-DEL-VALLE,JOSÉ R; CARRILLO-RODRIGUEZ,JOSÉ C.
Pinus pseudotrobus es una especie con aprovechamiento maderable, distribuida en un amplio gradiente altitudinal, de 1.600 a 3.250 m, lo que sugiere una varianza genética que puede ser aprovechada mediante la selección de árboles que provean semillas que generen plantas con altas tasas de crecimiento relativo. Por lo anterior, se evaluó la sobrevivencia y crecimiento inicial de Pinus pseudostrobus en vivero, con base en la variación de progenies de 38 árboles sobresalientes (procedencias) en rodales naturales de la Sierra Norte de Oaxaca, México. La siembra se realizó en febrero de 2013 en un vivero localizado en Ixtlán de Juárez, cercano a la región de colecta, a 2030 msnm y un clima templado. Además de evaluar la sobrevivencia de 54 a 166 días después de...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100013

JUVENILE HEIGHT GROWTH RATES AND SORTING OF THREE NOTHOFAGUS SPECIES ON AN ALTITUDINAL GRADIENT
Provedor de dados: 73
Autores: Cárdenas Garrido,Cecilia; Lusk,Christopher H.
It has been argued that if the cost of investment in cold resistance mechanisms detracts significantly from growth rates, then height growth tradeoffs should control species sorting on latitudinal temperature gradients. Applying the same logic to altitudinal temperature gradients, it can be predicted that species' upper altitudinal limits will be fixed by their degree of cold resistance, whereas the lower altitudinal limits of species growing higher up will be set by competition from faster-growing thermophilous species. We tested this prediction for three Nothofagus species on an altitudinal gradient (1,100 - 1,700 m) near Termas de Chillán, on the lower western slopes of the Andean Cordillera. We used retrospective methods to measure height increment...
Tipo: Journal article
Palavras-chave: Altitude; Cold resistence; Competition; Temperate forest; Tradeoff.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100004

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

Morfología de Peridiniopsis elpatiewskyi (Ostenfeld) Bourrelly (Dinophyceae) encontrada por primera vez en aguas continentales de Chile
Provedor de dados: 73
Autores: ASCENCIO,ENRIQUE; RIVERA,PATRICIO; CRUCES,FABIOLA.
Se menciona por primera vez para las aguas continentales de Chile a Peridiniopsis elpatiewskyi (Ostenfeld) Bourrelly, una especie de amplia distribución geográfica, pero escasamente citada para Suramérica. La especie fue encontrada en la laguna Lo Méndez (VIII Región) y observada y fotografiada mediante microscopía fotónica y electrónica de barrido. Su fórmula tabular es Po, X, 4´, 7´´, 6C, 5S, 5´´´, 2´´´´. Se describen sus características morfológicas relevantes y se analizan las diferencias entre el material chileno y el descrito en la literatura. Se confirma la preferencia del taxón para aguas eutróficas con pH alcalino.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100006

Latitudinal patterns in Pteridophyte distribution of Continental Chile
Provedor de dados: 73
Autores: PARRA,MARÍA JOSÉ; RODRÍGUEZ,ROBERTO; CAVIERES,LOHENGRIN; MUÑOZ-TAPIA,LAUREANA; ATALA,CRISTIAN.
Chilean vegetation has been described based on dominant trees and shrubs, giving little attention to less conspicuous plants such as pteridophytes sensu lato (ferns and lycophytes). These plants have different ecological demands and reproductive strategies than woody plants and are excellent tools to recognize vegetation zones. In the present study we analyze the distributional patterns of the 124 pteridophyte taxa occurring in continental Chile, regarding species richness and habitat preferences distribution. Using Jaccard&amp;#8217;s similarity index and grouping analysis, we obtained 5 pteridophyte zones that are significantly different from each other. Species richness distribution showed unimodal pattern with latitude, increasing from 17º S toward...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100008

PTEROCACTUS (CACTACEAE), NUEVO REGISTRO PARA LA FLORA DE CHILE
Provedor de dados: 73
Autores: Kiesling,Roberto.
Se menciona el género Pterocactus (Cactaceae) por primera vez para la flora de Chile, representado por P. hickenii Britton &amp;amp; Rose. Además, esta especie, que se conocía sólo del extremo SE de la Patagonia, con las nuevas colecciones amplía su área conocida a toda la meseta patagónica al S de la latitud 43°30' S en Argentina
Tipo: Journal article
Palavras-chave: Cactaceae; Pterocactus; Flora de Chile; Nuevo registro.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000200002

El número cromosómico de Phycella australis Ravenna (Amaryllidaceae)
Provedor de dados: 73
Autores: Baeza,Carlos M; Ruiz,Eduardo; Negritto,María.
The chromosome number of Phycella australis Ravenna from Chile was examined. The species has 2n = 2x = 16 chromosomes, with 2m + 4sm + 2st chromosomes. The reported karyotype is asymmetric (AsI % = 63.11)
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100012

NO AND N2O FLUXES FROM A BELGIAN FOREST AFFECTED BY ELEVATED NITROGEN DEPOSITION
Provedor de dados: 73
Autores: Boeckx,Pascal; Vervaet,Hilde; Cleemput,Oswald van.
Nitrous oxide (N2O) and nitric oxide (NO) are important atmospheric trace gases, and soils (including forest soils) are a substantial source of both gases. In forests subjected to elevated N deposition these emissions are considered as indirect emissions from agricultural N sources (mainly NH3) or combustion (e.g. NOx from traffic). However, knowledge about N2O and NO exchange between forests and the atmosphere is scarce. The aim of this study was to determine N2O and NO emission rates from a deciduous forest in Belgium, receiving a high N-deposition (ca. 40 kg N ha-1 yr-1). In April 2000, the NO emission from the forested location was 17.3 (± 1.2) and 17.05 (± 0.7) ng NO-N m-2 s-1, respectively, for the soil including the organic layer and the mineral...
Tipo: Journal article
Palavras-chave: Emission; Forest soil; Nitrogen; Cycling; Nitric oxide; Nitrous oxide.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200003

Seed structure and initial development of Byrsonima basiloba Juss. (Malpighiaceae)
Provedor de dados: 73
Autores: Dos Santos Silveira,Conceição Eneida; Palhares,Dario; Barros,Karina; Pereira,Damasceno; Gomes Luís,Zanderluce; Rodrigues Pereira,Luiz Alfredo.
ABSTRACT Byrsonima basiloba Juss. is a fast growing shrub that produces edible and juicy fruits. This research studied the morphology and anatomy of seeds and seedlings. The hard endocarp was crested and triloculate, with one seed per locule. B. basiloba seed was composed of a testa and a tegmen with residual endosperm. The embryo was ivory, with long, foliaceous, circinate, anisophyllous cotyledons with disjointed apices. The embryonary axis was short, straight and occupied a small portion of the seed with short epicotyl, and radicle with a rudimentary root cap. In the seedlings, it was possible to differentiate the protoderm, procambium and ground meristem in the elongation zone. The differentiation process in this species occurred early in the embryo....
Tipo: Journal article
Palavras-chave: Seedling; Cotyledons; Endocarp; Amphistomy; Cerrado.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200355

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

Optimización de parámetros para la propagación in vitro de Colobanthus quitensis (Kunth) Bartl.
Provedor de dados: 73
Autores: CUBA-DÍAZ,MARELY; ACUÑA,DANIELA; CORDERO,CRISTIAN M.; KLAGGES,MACARENA.
Colobanthus quitensis es una de las dos plantas vasculares nativas que habitan en la Antártica. Además, se distribuye desde el sur de México hasta el norte de la Península Antártica y desde los 0 hasta los 4.200 m s.n.m., siempre en hábitats extremos. Es considerada una especie modelo para estudios en estrés abióticos. Debido a su pequeño tamaño y la poca accesibilidad a sus hábitats es necesario disponer de métodos eficientes de propagación para mantenerla en el laboratorio. El objetivo del presente trabajo fue optimizar algunos parámetros críticos en la propagación in vitro de esta especie relacionados con aspectos físicos y químicos para evitar efectos negativos como el amarillamiento y muerte de explantes y mejorar el condicionamiento de las nuevas...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100009

THE GENUS HYDROLITHON FOSLIE (CORALLINALES, RHODOPHYTA) ALONG THE ATLANTIC AND CARIBBEAN COASTS OF MEXICO
Provedor de dados: 73
Autores: Mendoza-González,Catalina; Pedroche,Francisco F; Mateo-Cid,Luz Elena.
This paper provides the first monographic account of the genus Hydrolithon Foslie (1909) along the Atlantic and Caribbean coast of Mexico. We found five species of this genus including two new records for this region: H. onkodes (Heydrich) D.Penrose et Woelkerling and H. reinboldii (Weber van Bosse et Foslie) Foslie. The most common species in the study area was H. farinosum (J.V.Lamouroux) D.Penrose et Y.M.Chamberlain. H. onkodes and H. pachydermum (Foslie) J.C.Bailey, J.E.Gabel et D.W.Freshwater were compared with lectotype specimens. All species may be differentiated between them on the basis of the next characteristics: 1) Habit: with or lacking protuberances, free or attached; 2) Thallus construction: monomerous or dimerous; 3) Basal region:...
Tipo: Journal article
Palavras-chave: Coralline; Hydrolithon; Non-geniculate; Taxonomy; Distribution.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200008

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

OBITUARIO: HOMENAJE A CALVIN J. HEUSSER (1924-2006)
Provedor de dados: 73
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100001

INDICE BIBLIOGRAFICO DE LAS DIATOMEAS (BACILLARIOPHYCEAE) DE CHILE
Provedor de dados: 73
Autores: Rivera Ramírez,Patricio.
Recientes revisiones de familias y géneros de diatomeas chilenas demuestran que el conocimiento taxonómico sobre esta flora es aún muy incompleto y, en muchas ocasiones, erróneo. El objetivo de esta obra es entregar información sobre los trabajos taxonómicos y de distribución de las diatomeas marinas y dulceacuícolas de Chile y contiene 197 referencias bibliográficas correspondientes al período 1840-2000
Tipo: Journal article
Palavras-chave: Indice bibliográfico; Taxonomía; Distribución; Diatomeas; Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100002

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

PHAEOGRAPHIS PATAGONICA (GRAPHIDACEAE, ASCOMYCOTA) NEW TO ARGENTINA
Provedor de dados: 73
Autores: Messuti,María Inés; Codesal,Patricia L.
Phaeographis patagónica Zahlbr., es registrada por primera vez para la Argentina. Los especímenes aquí citados fueron coleccionados en la región del bosque templado tipo valdiviano o selva valdiviana al sudoeste del país. Se presenta una breve descripción, habitat, distribución y una clave de las especies presentes en la Argentina.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200019

Orchidioid fungi of the form-genus Rhizoctonia associated with the roots of Chloraea cuneata Lindl. from Araucanía, Chile
Provedor de dados: 73
Autores: ATALA,CRISTIAN; PEREIRA,GUILLERMO; ROMERO,CHRISTIAN; MUÑOZ-TAPIA,LAUREANA; VARGAS,REINALDO; SUZ,LAURA M.
Chloraea cuneata es una orquídea endémica de Chile en Peligro Crítico de Extinción. Se aislaron e identificaron hongos orquidioides a partir de pelotones ubicados en células corticales de sus raíces pertenecientes al género-forma Rhizoctonia, teleomorfo Thanatephorus (multinucleado), los que podrían ser usados en iniciativas de conservación.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100017

THE ALPINE LIFE ZONE UNDER GLOBAL CHANGE
Provedor de dados: 73
Autores: Körner,Christian.
Nearly forty percent of mankind depend in one way or another on mountain ecosystems. Local ecosystem services are slope stability, water yield, agricultural products or recreational value. Continental scale influences include drinking water supply, ground water recharging, irrigation water, hydroelectric power, flood control, traffic routes etc. In this paper I review evidence of alpine ecosystem responses to global change. It is emphasized that soil conservation is the centerpiece of any consideration of sustainable land use in alpine terrain. Complete vegetation cover of high biological diversity is essential to protect soils and secure `ecosystem services' in upland systems. It is illustrated that this is not necessarily in conflict with land use and...
Tipo: Journal article
Palavras-chave: Altitude; Biodiversity; Climate; Conservation; Grazing; High elevation; Land use; Mountain.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100001

PRESENCIA DE NOTHOFAGUS ALPINA (POEPP. ET ENDL.) OERST.: (FAGACEAE) EN EL BORDE COSTERO DE LA REGION DEL MAULE, CHILE CENTRAL
Provedor de dados: 73
Autores: Sepúlveda,César A.; Stoll,Alexandra.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200008

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

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

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

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

Nuevos registros de poblaciones amenazadas de Pilgerodendron uviferum D.Don (Florin) en su límite norte en la Cordillera de la Costa chilena
Provedor de dados: 73
Autores: Soto,Daniel P; Bannister,Jan R; Ríos,Andrea I; Le Quesne,Carlos.
We describe twelve previously undocumented Pigerodendron uviferum D.Don (Florin) populations outside of protected areas at the northern limit of the Chilean Coast Range (from 39º43'-40º S), extending their northern limits. These small swamp-populations are isolated within a matrix of pastures and exotic forest plantations, and are subject to “chronic” anthropogenic disturbances.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100010

Observation of bacteria over the surface of released oogonia from Fucus vesiculosus L. (Phaeophyceae)
Provedor de dados: 73
Autores: GOECKE,FRANZ; LABES,ANTJE; WIESE,JUTTA; SCHMALJOHANN,ROLF; ÍMHOFF,JOHANNES F.
Pese al enorme número de bacterias que se encuentran normalmente en la columna de agua, se registra por primera vez su presencia sobre oogonios del alga Fucus vesiculosus. En cortes transversales, sin embargo, los oogonios se encontraban libres de epibiosis. Las algas fucoides son fundamentales en ciertos ambientes costeros, mas el impacto microbiano sobre su ciclo de vida y colonización es completamente desconocido.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200016

Recuentos cromosómicos en plantas que crecen en Chile. IV
Provedor de dados: 73
Autores: Baeza,Carlos M.; Peñailillo,Patricio; Novoa,Patricio; Rosas,Marcelo; Finot,Víctor L.; Ruiz,Eduardo.
RESUMEN Se entregan números cromosómicos de 19 especies de la flora vascular de Chile, obtenidos de raíces provenientes de semillas germinadas en placas Petri o de material recolectado en terreno creciendo en maceteros en invernadero. Nuevos registros citológicos para la flora de Chile son: Alstroemeria magnifica Herbert subsp. magenta (Bayer) M. Muñoz (2n = 16), Astragalus looseri I.M. Johnst. (2n = 22), Centaurea melitensis L. (2n = 24), Centaurea solstitialis L. (2n = 16), Erigeron andicola DC. (2n = 36), Montiopsis potentilloides (Barnéoud) D.I. Ford (2n = 20), Persea lingue (Ruiz et Pav.) Nees ex Kopp (2n = 24), Phycella cyrtanthoides (Sims) Lindl. (2n = 16), Picris echioides L. (2n = 10), Rhodophiala aff. maculata (L'Hér.) Ravenna (2n = 18), Teline...
Tipo: Journal article
Palavras-chave: Números cromosómicos; Flora vascular de Chile.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200183

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

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

Revision of the genus Nastanthus (Calyceraceae)
Provedor de dados: 73
Autores: Zavala-Gallo,Lucio; Denham,Silvia; Pozner,Raúl.
The nomenclatural revision of 51 names previously published, combined or synonymyzed under the genus Nastanthus (Calyceraceae) is presented. Six species are recognized with correct names and new synonyms established. The nomenclature of Nastanthus ventosus, Nastanthus scapigerus and Nastanthus compactus is updated, giving a total of 45 synonyms. Lectotypes for Boopis caespitosa, Boopis scapigera, Boopis spathulata, Nastanthus laciniatus, Boopis araucana, Calycera ventosa, Nastanthus pinnatifidus and Boopis breviflora are here designated. A map with the geographic distributions, complete species descriptions, corrected illustrations, and a new key to accepted species of Nastanthus, are included.
Tipo: Journal article
Palavras-chave: Calyceraceae; Nastanthus; Taxonomy.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200002

NOTA SOBRE LA PRESENCIA DE HELIOTROPIUM KRAUSEANUM FEDDE (HELIOTROPIACEAE) EN CHILE
Provedor de dados: 73
Autores: Luebert,Federico; Pinto,Raquel.
The presence of Heliotropium krauseanum Fedde is reported near Iquique in northern Chile (19°37'S, 70°11'O). The species had been previously collected only in Perú. This report represents an important southward geographic range extension for the species, and a northward extension of the range of the section Cochranea of this genus in Chile
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000200003

Estudio preliminar de la biodiversidad vegetal terrestre en el Estero Walker (Región de Aysén, Chile): utilizando líneas base de proyectos de inversión
Provedor de dados: 73
Autores: RAMÍREZ,CARLOS; ORTIZ,INGRID; SAN MARTÍN,CRISTINA; VIDAL,OSVALDO; ÁLVAREZ,MIGUEL; PÉREZ,YÉSSICA; SOLÍS,JOSÉ LUIS; ÁLVAREZ,IVÁN.
Utilizando datos tomados con metodología fitosociológica en la línea base de un proyecto de acuicultura se estudiaron la flora y la vegetación terrestre en 5 sectores de las riberas del Estero Walker, ubicado en la Patagonia occidental chilena. Se construyó un catálogo preliminar de la flora que consta de 68 especies nativas, en las cuales dominan Dicotiledóneas, Monocotiledóneas y Helechos, estos últimos indican alta humedad atmosférica en el lugar. La ausencia de plantas anuales y bienales confirma la presencia de un clima húmedo frío, y la de malezas, la escasa intervención antrópica. La baja similitud florística entre los sectores estudiados está condicionada por la exposición y una variada oferta de hábitats. La presencia, cobertura e importancia de...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200006

Nuclear DNA content and chromosome number of Krameria cistoidea Hook. &amp;amp; Arn. (Krameriaceae)
Provedor de dados: 73
Autores: Palma-Rojas,Claudio; Jara-Seguel,Pedro; García,Marjorie; Von Brand,Elisabeth.
RESUMEN Krameria cistoidea Hook. &amp; Arn. tiene un valor 2C de 18,64 + 1,09 pg con un coeficiente de variación de 5,8%. El número cromosómico 2n = 12 descrito para otras seis especies de Krameria está también presente en K. cistoidea. Estos datos citológicos de K. cistoidea son discutidos en relación a antecedentes disponibles para otras Angiospermas, así como para tres géneros de la familia taxonómicamente relacionada Zygophyllaceae.
Tipo: Journal article
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100233

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

The taxonomic identity of the neglected Racomitrium stenocladum (Bryophyta, Grimmiaceae)
Provedor de dados: 73
Autores: LARRAÍN,JUAN; QUANDT,DIETMAR; MUÑOZ,JESÚS.
El olvidado nombre Racomitrium stenocladum Dusén es revalidado luego de ser considerado un sinónimo de R. orthotrichaceum (Müll. Hal.) Paris (=Bucklandiella orthotrichacea (Müll. Hal.) Bednarek-Ochyra &amp;amp; Ochyra) por más de 25 años. La especie se distingue de B. orthotrichacea por las hojas fuertemente adpresas a los tallos en seco, la forma de la costa en sección transversal y la lámina mayoritariamente de un solo estrato de células. El nombre es lectotipificado y se propone la nueva combinación Bucklandiella stenoclada (Dusén) Larraín. Se presenta además una clave para las especies de Bucklandiella del sur de Sudamérica (al sur de los 30°S).
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200022

Requerimientos pregerminativos de Maihuenia patagonica y Maihueniopsis darwinii, cactáceas endémicas de Patagonia
Provedor de dados: 73
Autores: AILÍN MASINI,ANA CARLA; ROVERE,ADRIANA EDIT; PIRK,GABRIELA INÉS.
Las cactáceas son plantas características de ecosistemas áridos, en los cuales desarrollan un importante papel ecológico. Se encuentran amenazadas por la destrucción del hábitat y la extracción con fines comerciales. Argentina es uno de los países de Sudamérica con mayor riqueza y nivel de endemismo de cactáceas, sin embargo, su estudio es escaso, especialmente para las especies de distribución más austral. Dado que un mayor conocimiento sobre la biología reproductiva de los cactus ayudaría a mejorar su conservación, se estudiaron aspectos fisiológicos básicos sobre la germinación de dos especies endémicas de Argentina y Chile, Maihuenia patagonica (Phil.) Britton &amp;amp; Rose y Maihueniopsis darwinii (Hensl.) F. Ritter var. hickenii (Britton &amp;amp;...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200002

Estado de conservación de la flora nativa de las regiones de Arica-Parinacota y de Tarapacá, Chile
Provedor de dados: 73
Autores: GATICA-CASTRO,ALEJANDRO; MARTICORENA,ALICIA; ROJAS,GLORIA; ARANCIO,GINA; SQUEO,FRANCISCO A.
El estado de conservación de la flora nativa a una escala administrativa como la regional es útil para implementar medidas que reduzcan la pérdida de biodiversidad a nivel local. En este trabajo se clasifica la flora nativa de las regiones de Arica-Parinacota y de Tarapacá según su estado de conservación, utilizando una base de datos de 7.432 registros geo- referenciados que corresponden a 717 especies vasculares nativas. La clasificación se realizó utilizando principalmente los criterios de distribución geográfica de UICN (versión 3.1). Un 27,6% de las especies nativas presentes en estas regiones presentan problemas de conservación (3,2% En Peligro y 24,4% Vulnerable). En la Región de Arica y Parinacota las especies amenazadas alcanzarían el 34,4% de la...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200013

Nuevos antecedentes en la distribución y ecología de Botrychium dusenii (H. Christ.) Alston (Ophioglossaceae) asociado a ambientes antropogénicos de la provincia de Coyhaique, Región de Aysén, Chile
Provedor de dados: 73
Autores: Bravo-Monasterio,Pablo; Peñailillo,Patricio; Fajardo,Alex.
Conducting botanical and ecological explorations with the objective of studying the floristic composition of post-fire communities in the Aysén Region, we found new regional records of the fern Botrychium dusenii (H. Christ.) Alston (Ophioglossaceae). These findings, that extend the north limit of the species distribution, occurred in open areas affected by historical human-provoked fires (happening between 1950 and 1960) during the regional process of colonization.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100025

MICOBIOTA LIQUENIZADA DEL PARQUE KATALAPI, X REGION, CHILE
Provedor de dados: 73
Autores: Pereira,Iris.
En este trabajo se presentan los resultados del estudio de la micobiota liquenizada del Parque Katalapi, X Región, (Región de los Lagos), Chile, con la finalidad de proveer información que contribuya a futuros estudios ecológicos. Dentro del parque se establecieron 5 sitios de muestreo, abarcando la mayor diversidad de sustratos disponibles: cortezas de troncos y ramas de árboles y arbustos, musgos, suelo y rocas, algunas de éstas sumergidas. Otros sustratos correspondieron a cortezas de árboles frutales y ornamentales. Hasta el momento fueron relevadas 45 especies: 18 (40%) de éstas correspondieron a cianolíquenes. El 60 % restante a clorolíquenes. Para cada taxón, se señala su distribución dentro del parque, hábito, hábitat y fotobionte. Se informa de 3...
Tipo: Journal article
Palavras-chave: Cianolíquenes; Clorolíquenes; Diversidad; Fotobiontes; Micobiota liquenizada.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200004

Estudios cariotípicos en especies de Gilliesieae Lindl. (Gilliesioideae-Alliaceae) de Chile central
Provedor de dados: 73
Autores: ESCOBAR,lNELIA; RUIZ,EDUARDO; BAEZA,CARLOS.
La tribu Gilliesieae Lindl. es parte del grupo sudamericano de Alliaceae, caracterizada por presentar una alta diversificación floral, desplegando diferentes grados de simetría bilateral, variación del número de tépalos y estambres, y presencia de apéndices florales, con altos niveles de endemismo principalmente en la zona del clima mediterráneo de Chile central. Desde el punto de vista citológico, sólo se conoce la dotación cromosómica de tres especies. Este estudio presenta el cariotipo de 10 especies representantes de los géneros Ancrumia, Gethyum, Gilliesia, Miersia, Solaria y Speea. Se indican los primeros reportes para 7 taxones: Ancrumia cuspidata, Gilliesia graminea, G. montana, Miersia minor, M. leporina, M. tenuiseta y Speea humilis. Se observan...
Tipo: Journal article
Palavras-chave: Cariotipos; Número cromosómico; Translocaciones Robertsonianas; Fisiones céntricas; Endemismo.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200003

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

LISTA COMENTADA DE LAS PLANTAS VASCULARES DE LOS NEVADOS DE CHILLAN, CHILE
Provedor de dados: 73
Autores: Rodríguez,Roberto; Grau,Jürke; Baeza,Carlos; Davies,Alison.
Los Nevados de Chillan han sido históricamente un punto casi obligado de visita y de estudio para muchos botánicos, ya que su flora nativa es extremadamente interesante por su origen subtropical, por su alto nivel de endemismo y por su carácter altoandino. En la actualidad se observa un alto grado de perturbación antrópica debido a la presión ejercida en varios sectores por la actividad inmobiliaria y turística, principalmente. En esta cordillera se encuentran dos áreas silvestres protegidas, la Reserva Nacional Nuble y la Reserva Nacional Los Huemules de Niblinto. La flora de plantas vasculares de los Nevados de Chillan está representada por 616 especies, de las cuales 422 son nativas, 128 son endémicas de Chile y 66 son introducidas. La familia mejor...
Tipo: Journal article
Palavras-chave: Flora; Conservación; Plantas invasoras.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200005

Influencia de las auxinas sobre el enraizamiento in vitro de microtallos de Nothofagus glauca (Phil.) Krasser
Provedor de dados: 73
Autores: Uribe,Matilde E; Ulloa,José; Delaveau,Catherine; Sáez,Katia; Muñoz,Fernando; Cartes,Priscila.
Nothofagus glauca posee una situación privilegiada en asociaciones con especies problemáticas como Nothofagus alessandrii, Beilschmiedia berteroana y Nothofagus leonii, esto multiplica su valor ecológico y paisajístico, por las relaciones en su hábitat nativo. N. glauca se considera clave en determinados hábitats y su pérdida o continua disminución puede afectar directamente a otras especies. La conservación ex situ es una prioridad para el rescate de la especie, por tanto el cultivo de tejidos es, entre otros, uno de los mecanismos alternativos de propagación y conservación de las especies. El objetivo de este estudio fue evaluar el efecto independiente de dos auxinas, ácido naftalenacético (ANA) y ácido 3-indolbutírico (AIB), en el enraizamiento in vitro...
Tipo: Journal article
Palavras-chave: Ácido 3-indolbutírico; Ácido 1-naftalenacético; Raíces adventicias; Nothofagus glauca.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100010

POACEAE EN EL ARCHIPIELAGO DE JUAN FERNANDEZ (ROBINSON CRUSOE)
Provedor de dados: 73
Autores: Baeza,Carlos M; Marticorena,Clodomiro; Stuessy,Tod; Ruiz,Eduardo; Negritto,María.
El archipiélago de Juan Fernández (Robinson Crusoe) está ubicado a 670 km al oeste de Valparaíso, en el Océano Pacífico. Está formado por tres islas, todas de origen volcánico: Más a Tierra (Robinson Crusoe) Más Afuera (Alejandro Selkirk) y Santa Clara. Los inventarios más completos de la flora de este archipiélago fueron realizados por Johow a fines del s. XIX y por Skottsberg, a mediados del siglo pasado. El estudio más reciente es el de Danton &amp;amp; Perrier. La flora documentada es de 423 especies de plantas vasculares, 55 Pteridophyta, 289 Dicotyledoneae y 79 Monocotyledoneae. Del número total de especies, 31,2% son endémicas, 18,7% nativas y 50,1% adventicias. La familia Poaceae comprende el 11% de la flora total de las islas y presenta 53...
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200001

Primer registro de Heliotropium amplexicaule &amp;#40;Heliotropiaceae&amp;#41; en Chile
Provedor de dados: 73
Autores: Ibáñez,Sergio; Luebert,Federico; Gómez,Miguel.
The presence of the commonly known weed Heliotropium amplexicaule (Heliotropiaceae) is reported for Chile first time, from a collection recently made in Santiago. Its potential as weed in Chile is discussed in the context of the experience of other countries where the species has become naturalised.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100009

Spicaticribra kingstonii Johansen, Kociolek &amp;amp; Lowe (Thalassiosirales, Bacillariophyta): primera cita del género y de la especie para las aguas continentales de Chile
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola.
Spicaticribra kingstonii Johansen, Kociolek &amp;amp; Lowe fue hallada en aguas de la Laguna Grande de San Pedro, Chile. Esta es la primera cita del género y de la especie para el país. Los individuos chilenos carecen de una fultoportula central en la cara valvar, de tubos externos en las fultoportulae marginales y poseen aréolas con cribra internas anastomosadas en forma de espiga, características que concuerdan con las del género Spicaticribra. En el presente trabajo se entrega una diagnosis con las características relevantes de los individuos chilenos, se comenta la variabilidad de algunas de ellas, se menciona su relación con taxones afines, y fotografías obtenidas mediante técnicas de microscopia fotónica y electrónica de barrido ilustran esos...
Tipo: Journal article
Palavras-chave: Primera cita; Diatomea; Laguna Grande; Chile.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200004

PRIMER REGISTRO DE THALASSIONEMA PSEUDONITZSCHIOIDES (SCHUETTE &amp;amp; SCHRADER) HASLE (THALASSIONEMATACEAE, BACILLARIOPHYCEAE) EN EL PACIFICO SURORIENTAL FRENTE A LA COSTA DE CHILE
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola; Avaria,Sergio.
This note reports the finding of Thalassionema pseudonitzschioides (Schuette &amp;amp; Schrader) Hasle in samples collected in Iquique Bay (20°12'S, 70°10'W), in northern Chile. This is the first record of the species for the region. The taxon has been associated mainly with subtropical to temperate waters
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000200006

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

Legítima dispersión de semillas Ugni molinae Turcz. (Myrtaceae), por monito del monte, Dromiciops gliroides
Provedor de dados: 73
Autores: MORA,JUAN PABLO; SOTO-GAMBOA,MAURICIO.
We investigated if the marsupial Dromiciops gliroides (Microbiotheriidae) is a legitimate seed disperser of Ugni molinae (Myrtaceae). We compared the germination rate of defecated and not-defecated seeds. The results show that defecated seeds are viable and show a high germination rate than no-defecated seeds. We conclude that D. gliroides is a legitimate seed disperser of U. molinae, and it may affect their reproductive success. These results are the first evidence of a seed disperser for U. molinae, and also support the proposal that D. gliroides have an important role as a seed disperser in the temperate forest of southern South America.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200018

FRUIT (PERICARP AND SEED) ONTOGENY OF SIDA SPECIES
Provedor de dados: 73
Autores: Muneratto,Junior C; Souza,Luiz A.
Fruits (pericarps and seeds) of the weedy species Sida rhombifolia L., S. urens L. and S. regnellii R. E. Fr. were analyzed structurally using light and scanning electron microscopy. The yellowish brown calyx is persistent on the mature fruit and consists of a crystalliferous hypodermis with U-shaped wall thickenings and homogeneous mesophyll. Fruits are schizocarpic, of the subtype coccarium, with a fibrous endocarp. Seeds are exotegmic and the embryos are clearly bent, with folded cotyledons. Structural features that are potentially significant to species' characterization are the structure of the ovary, the morphology of the mericarp apex, the pattern of the reticulate sclerenchymatous endocarp and the presence or absence of nonglandular trichomes in...
Tipo: Journal article
Palavras-chave: Pericarp; Seed; Malvaceae; Weedy species; Ovary.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100006

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

GERMINACION Y MORFOGENESIS GAMETOFITICA DE PTERISINERMIS (ROSENST.) DE LA SOTA
Provedor de dados: 73
Autores: Tanco,María Elena; Martínez,Olga Gladys; Cristina Bonomo,María Luisa.
Se presenta el desarrollo protálico de Pteris inermis (Rosenst.) de la Sota, estudiado mediante técnicas de cultivo in vitro. La germinación de esporas recientemente recolectadas comienza a los 6 días, y a los 27 días las que fueron almacenadas durante un año. La germinaciones de tipo Vittaria. El tratamiento con reguladores de crecimiento, Giberelinay Benziladenina (BA), reduce el tiempo de germinación, especialmente con 0,5 ppm/L de Giberelina. Durante la fase filamentosa se forman ramificaciones que originan colonias en la etapa adulta. El desarrollo protálico es tipo Ceratopteris. Se han encontrado protalos anteridiados, arquegoniados, bisexuales y neutros. Los arquegonios se originan sobre el lado abaxial de la costilla central o hacia ambos lados,...
Tipo: Journal article
Palavras-chave: Pteris; Germinación; Desarrollo protálico; Reguladores de crecimiento.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100002

TOXICIDAD DE PAULLINIA CLAVIGERA SCHLTDL. (SAPINDACEAE) Y CHONDRODENDRON TOMENTOSUM RUIZ ET PAV. (MENISPERMACEAE) SOBRE EL PIOJO SALTADOR DEL CAMU CAMU TUTHILLIA COGNATA (HEMIPTERA: PSYLLIDAE)
Provedor de dados: 73
Autores: Pérez,Diana; Iannacone,José; Tueros,Alfredo.
Se determinó el efecto tóxico de dos extractos hidroalcohólicos procedentes de dos plantas amazónicas de importancia etnobotánica, Paullinia clavigera Schltdl. "sachayoco" (Sapindaceae) y Chondrodendron tomentosum Ruiz et Pav "curare" (Menispermaceae), ambas en desarrollo vegetativo, sobre ninfas del III estadio de Tuthillia cognata Hodkinson, Brown &amp;amp; Burckhardt, 1986 "piojo saltador del camu camu" (Hemiptera: Psyllidae). Las ninfas de T. cognata se colectaron en plantaciones del caserío San Juan en el distrito de Yarinacocha, Ucayali, Perú. Los bioensayos se realizaron empleando un Diseño de Bloque Completo al Azar (DBCA): 6x4. Los extractos se maceraron durante siete días a una proporción 1:10 (p/v) con posterior evaporación del solvente en...
Tipo: Journal article
Palavras-chave: Bioensayo; Fitoquímica; Insecticida vegetal; Tuthillia cognata.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200004

Invasion of Rubus praecox (Rosaceae) is promoted by the native tree Aristotelia chilensis (Elaeocarpaceae) due to seed dispersal facilitation
Provedor de dados: 73
Autores: REJMÁNEK,MARCEL.
Seed dispersal facilitation among plant neighbours can be defined as an increase in the number, distances, and/or places reached by a plant&amp;#8217;s seeds that is due to the presence of co-fruiting plant neighbours with which it shares seed dispersers. Many cases of this phenomenon have been described among native species and some also among introduced invasive species. Moreover, facilitation of native species recruitment by non-native fleshy-fruiting trees has been reported. Surprisingly, seed dispersal facilitation of exotic species by native species is either less common or has not been properly documented so far. Casual observation of secondary vegetation in La Araucanía Region, Chile, suggests that more individuals of exotic fleshy-fruiting...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100004

NUEVAS POBLACIONES DE BERBERIDOPSIS CORALLINA HOOK.F. (BERBERIDOPSIDALES: BERBERIDOPSIDACEAE) EN LA REGION DEL BIO BIO, CHILE: UBICACION Y CONSERVACION DE SU HABITAT
Provedor de dados: 73
Autores: Alarcón,Diego; Smith-Ramírez,Cecilia; Hechenleitner,Paulina; Ramírez de Arellano,Pablo; Oliva,Mario; Pinto,Misael.
Se presenta la ubicación de 123 nuevos registros de la enredadera leñosa michay rojo o voqui pilfuco (Berberidopsis corallina Hook.f.) en la Región del Bío Bío, Chile, y se describe el estado de conservación de su hábitat. Las poblaciones de esta especie amenazada fueron descubiertas en 65 fragmentos de vegetación y bosques nativos con fines de protección, al interior de predios de la empresa forestal Bosques Arauco S.A. Estos registros incrementan significativamente la distribución espacial y altitudinal conocida para esta especie endémica del país y considerada en peligro de extinción. Además, estos nuevos registros revelan una mayor continuidad de sus poblaciones en la región respecto de datos previos.
Tipo: Journal article
Palavras-chave: Michay rojo; Berberidopsis corallina; Especies amenazadas; Distribución natural; Cordillera de Nahuelbuta.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200007

Especies exóticas de la vertiente occidental de la cordillera de la Costa, Provincia de Valparaíso, Chile central
Provedor de dados: 73
Autores: Teillier,Sebastián; Figueroa,Javier A; Castro,Sergio A.
En Chile central existe una rica flora vascular nativa y una alta proporción de plantas exóticas. Con el objeto de incrementar nuestro conocimiento sobre la composición de la fora exótica, naturalizada en Chile central, se describe y analiza aquella presente en la vertiente occidental de la cordillera de la Costa de la Provincia de Valparaíso en sitios con diferentes tipos de uso. Específcamente, se establecen la riqueza taxonómica, la forma de vida, el origen geográfco y de las especies exóticas en diversas áreas de la provincia. Se identifcaron 323 especies, de las que un 34% fueron exóticas; de ellas, un 74% fue de origen europeo y el 10% euro-norteafricano. En los sitios muestreados, las nativas sólo alcanzaron a un 23 % de la cobertura absoluta, en...
Tipo: Journal article
Palavras-chave: Plantas exóticas; Plantas alóctonas clima mediterráneo cordillera de la Costa Región de Valparaíso flora de Chile.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100004

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

Nueva localidad en Chile para Adesmia resinosa (Phil. ex Reiche) Martic. (Fabaceae)
Provedor de dados: 73
Autores: FLORES-TORO,LORENA; AMIGO,JAVIER.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200016

ESTRUCTURA Y COMPOSICIÓN FLORÍSTICA DE UN MATORRAL BAJO PLANTACIONES DE PINUS RADIATA D.DON EN CHILE CENTRAL
Provedor de dados: 73
Autores: Gómez,Persy; Hahn,Steffen; San Martín,José.
Se analiza la estructura y composición florística de un matorral bajo una plantación de Pinus radiata D.Don en el área costera, Región del Maule (35°27'43,3"S; 72°23'56"0), Chile central. Con nueve censos de vegetación se inventarió la flora vascular determinando la riqueza de especies, frecuencia, cobertura-abundancia, valor de importancia junto con origen fitogeográfico y forma de vida. La vegetación se compone de 48 especies distribuidas en 37 nativas, donde 19 son endémicas del país, y 11 introducidas. Dentro de las especies endémicas para el área costera maulina destaca Adesmia bijuga Phil. (Fabaceae). El matorral muestra una organización vertical en estratos donde la mayor cobertura corresponde al estrato arbustivo seguido del herbáceo y el arbóreo....
Tipo: Journal article
Palavras-chave: Región del Maule; Endémica; Nativa; Dosel; Área costera.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200010

VARIACION ESTACIONAL DE LA FLORA Y VEGETACION EN LA PRECORDILLERA ANDINA DE LA COMUNA DE PUTRE (I REGION DE TARAPACA, CHILE) DURANTE EL PERIODO 2002-2003
Provedor de dados: 73
Autores: Muñoz,Alejandra E; Bonacic,Cristián.
La precordillera de la I Región de Chile (18º 15´S _ 69º 33´W) es una franja que recibe efectos tanto del adyacente desierto ubicado hacia el poniente a menor altitud, como del Altiplano, el piso superior con el cual limita hacia el oriente. La vegetación en el área presenta, en consecuencia, una variación altitudinal, donde la precordillera se ubica en el segundo de cuatro pisos denominado comúnmente tolar o estepa arbustiva pre-altiplánica (sensu Gajardo). En esta zona 10 parcelas fueron muestreadas mediante el uso de transectos, en cuatro trabajos en terreno durante el año 2002 y 2003. En ellas se investigó acerca de las formas de vida, cobertura vegetal absoluta y relativa, diversidad y riqueza de especies vegetales vasculares en un período anterior y...
Tipo: Journal article
Palavras-chave: Altiplano; Vegetación; Formas de vida; Lluvias estivales.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100003

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

Relación entre riqueza de especies y diversidad funcional de atributos foliares en dos ensambles de especies siempreverdes de un bosque templado lluvioso
Provedor de dados: 73
Autores: Saldaña,Alfredo.
El bosque templado lluvioso (sur de Chile) está conformado por tipos forestales que difieren en composición y dominancia de las especies. Estas diferencias deberían determinar cambios en componentes de la diversidad que presentan correlación entre ellos. Este estudio buscó determinar si existe un vínculo entre la riqueza de especies leñosas (S) y la diversidad funcional de sus atributos foliares, en dos ensambles forestales que difieren en composición florística: tipos forestales Valdiviano y Coihue. Se postuló que: i) existe una relación global positiva entre la diversidad funcional y la S; ii) y que como los ensambles difieren en composición, la magnitud de la relación entre diversidad funcional y S diferirá entre los dos tipos forestales. Se describió...
Tipo: Journal article
Palavras-chave: Bosque-templado-lluvioso; Diversidad-funcional; Riqueza-especies; Siempreverdes; LMA.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200001

ESTUDIOS CITOGENETICOS EN POBLACIONES DE HYPOCHAERIS APARGIOIDES HOOK. ET ARN. (ASTERACEAE, LACTUCEAE) DE CHILE
Provedor de dados: 73
Autores: Baeza,Carlos; Jara,Solange; Stuessy,Tod.
Se realiza un estudio de los cariotipos de siete poblaciones de Hypochaeris apargioides Hook. et Arn, colectadas en la VIII Región de Chile. Todas las poblaciones estudiadas presentan una dotación cromosómica 2n = 8 ó 2n = 16. Las poblaciones analizadas no presentan diferencias significativas tanto entre el índice de asimetría del cariotipo (AsI %) como entre el índice intracromosomal (A1). El set de cromosomas para las siete poblaciones está constituido por 2 pares de cromosomas metacéntricos y 2 pares subtelocéntricos. Otra característica citológica es la presencia de constricciones secundarias en el brazo largo del par cromosómico número 2 y en el brazo corto del par número 3. Se reportan por primera vez tetraploides para dos poblaciones de esta especie
Tipo: Journal article
Palavras-chave: Asteraceae; Chile; Cariotipo; Hypochaeris apargioides; Número cromosómico.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100005

The effects of fire-related cues on seed germination and viability of Helenium aromaticum (Hook.) H.L. Bailey (Asteraceae)
Provedor de dados: 73
Autores: Gómez-González,Susana; Torres-Díaz,Cristian; Gianoli,Ernesto.
Se evaluó el efecto de la temperatura y el humo sobre la germinación de Helenium aromaticum; una planta anual abundante en matorrales incendiados. Encontramos que las semillas son resistentes a la alta temperatura (100°C) y al humo, pero su germinación no es estimulada por estos factores. Otras señales del fuego deben ser evaluadas.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100007

USE OF LONG-TERM DATA, MASS BALANCES AND STABLE ISOTOPES IN WATERSHED BIOGEOCHEMISTRY: THE HUBBARD BROOK MODEL
Provedor de dados: 73
Autores: Likens,Gene E.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100002

NEW PERSPECTIVES ON THE DETERMINATION OF PHOSPHATASE ACTIVITY IN ECTOMYCORRHIZAE OF NOTHOFAGUS OBLIQUA FORESTS IN SOUTHERN CHILE
Provedor de dados: 73
Autores: Alvarez,Maricel; Härtel,Steffen; Godoy,Roberto; Heyser,Wolfgang.
We present a method to localise and quantify surface-bound phosphatase activity (SBPA) in mycorrhizal fungi and mycorrhizae of Nothofagus obliqua (Mirb.) Oerst., using image processed confocal fluorescent microscopy. ELF-97 is a hydrophilic substrate which turns into a strongly fluorescent precipitate upon activation by phosphomonoesterases. In fungal mycelium, this technique has recently been approved by comparison with a standard method (p-nitrophenyl-phosphate). The microscopic technique based on ELF-97 revealed that Paxillus involutus (Batsch: Fr.) Sing. and Austropaxillus boletinoides (Sing.) Brsky. &amp;amp; Jarosch provide different adaptive strategies to changing phosphate concentrations and different pH (3-7). We also analysed SBPA in four...
Tipo: Journal article
Palavras-chave: Confocal microscopy; Ectomycorrhizae of Nothofagus obliqua; ELF-97; Phosphatase activity; Quantitative fluorescence microscopy.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100007

Estructura poblacional de Pinus radiata D.Don en fragmentos de Bosque Maulino en Chile central
Provedor de dados: 73
Autores: Gómez,Persy; Bustamante,Ramiro; San Martín,José; Hahn,Steffen.
In this note we examine the population structure of Pinus radiata, exotic plant that is invading fragments of the Maulino Forest. We evaluate pine density, age, proportion of reproductive individuals across 8 forest fragments. Our results indicate a high proportion of young individuals and reproductive individuals growing inside fragments. Moreover, the fragment size is negatively correlated with pine density but, the proportion of reproductive individuals are not correlated with this landscape attribute. Our result indicate the existence of a pine population that is actively invading forest fragments, a fact that needs to be considered in conservation plans of this native forest.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100010

El cariotipo de Chaetanthera renifolia (J. Remy) Cabrera (Asteraceae)
Provedor de dados: 73
Autores: Baeza,Carlos M; Ruiz,Eduardo; Torres-Díaz,Cristian.
The karyotype of Chaetanthera renifolia (J. Remy) Cabrera from Chile was examined. The species has 2n = 2x = 44 chromosomes, with lm+ lst + 2st-sat+ 17t+ lt-satchromosomes. The reported karyotype is bimodal and very asymmetric (AsK % = 86.6, TF % = 13.4 and Syi % = 15.5). These results are indicating that this species has the highest known chromosome number of the genus so far and the most asymmetrical karyotype of the group.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200012

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

Principios de la investigación en ciencias naturales históricas: ¿Por qué en biología es necesaria la Historia Natural de los organismos?
Provedor de dados: 73
Autores: VILLAGRÁN,CAROLINA; SEGOVIA,RICARDO; CASTILLO,LUCÍA.
Se discute en este trabajo el desarrollo histórico, significado y valor heurístico de la Historia Natural en la reflexión teórica y generación de hipótesis en biología. Sobre esta base se fundamenta la validez de una metodología propia en el dominio de las ciencias naturales históricas, en general. Primero se examinan de manera crítica los principios generales y metodologías que rigen la investigación en ciencias naturales históricas, en contraste con las ciencias biológicas experimentales. Se comenta el actualismo, un principio fundamental que valida el uso de análogos actuales y la formulación de retrodicciones en la investigación del pasado. También se comentan brevemente los métodos más comunes de la investigación histórica, como la iteración de...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200008

Induced twining in Ipomoea purpurea (L.) Roth.: response threshold and induction by volatiles and snail damage
Provedor de dados: 73
Autores: ATALA,CRISTIAN; QUILODRÁN,MANUEL; MOLINA-MONTENEGRO,MARCO A.
Twining in some Convolvulaceae can be induced by leaf damage and jasmonic acid application. This induced response is believed to reduce the likelihood of future leaf damage and it is limited by drought. This response has been detected in the Convolvulaceae family using artificial damage. The mechanisms and ecological implications of this response are still unknown. In this study was tested if the induced twining requires a threshold level and if it is induced by volatiles and/or by snail damage. Three separated greenhouse experiments were conducted in order to test the induced twining in Ipomoea purpurea (Convolvulaceae) by applying different levels of artificial damage (0, 1, 5, 10 perforations to the leaves), volatiles (ground leaves) and natural damage...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200001

Estudios cromosómicos en Acmella bellidioides (Sm.) R.K.Jansen (Asteraceae) del nordeste de Argentina
Provedor de dados: 73
Autores: Aguilera,Patricia M; Honfi,Ana I; Daviña,Julio R.
Acmella bellidioides es una hierba perenne pequeña, que crece naturalmente en las provincias del nordeste de Argentina, en Brasil, Paraguay y Uruguay. Pertenece a la sección Megaglottis, presenta número cromosómico gamético n = 13 y exhibe un amplio rango de variación morfológica que ha hecho difícil separarla de especies muy cercanas de la misma sección. Acmella bellidioides fue coleccionada en campos abiertos, de suelo arenoso y rocoso y se aplicaron técnicas citogenéticas convencionales para analizar sus cromosomas en mitosis, su comportamiento en la microsporogénesis y para confeccionar su cariotipo. Acmella bellidioides es diploide con 2n = 2x = 26 cromosomas de tamaño pequeño (2,22 - 4,01µm) y 39,25 µm/genoma. Su cariotipo, 12m + 10sm + 4st, es...
Tipo: Journal article
Palavras-chave: Cariotipo; Microsporogénesis; Comportamiento meiótico.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100003

Nueva localidad en Chile para Menodora linoides Phil. (Oleaceae), especie considerada extinta en el siglo XX
Provedor de dados: 73
Autores: Muñoz-Schick,Mélica; Moreira-Muñoz,Andrés; León-Lobos,Pedro.
An area in the Andes of the Valparaíso Region is indicated as a new locality for the species Menodora linoides Phil., an endemic and unique representative of the Oleaceae family in Chile. The plant described in 1863, was considered extinct in the 20th century, but has been collected twice in the present century
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000200004

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

Seed germination of species of the Juan Fernández archipiélago under laboratory conditions
Provedor de dados: 73
Autores: Cuevas,Jaime G; Figueroa,Javier A.
The Juan Fernández Islands contain one of the world's most interesting floras. However, their conservation status is fragile due to direct and indirect human activities. With the aim of contributing to the conservation of the native species of these islands, germination trials have been performed under laboratory conditions. We studied the germination patterns and characteristics of 25 taxa of the archipelago, at temperatures between 15°C and 25°C, with 12.5 h. of photoperiod. Thirty-five percent of the studied species germinated immediately (within the first month after sowing), while 50% had a delayed germination. Three species did not germinate. Regarding the germination pattern, nine taxa (53%) germinated synchronously (³ 90% of seeds germinated within...
Tipo: Journal article
Palavras-chave: Conservation Chile endemic island; Propagation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100007

Stomatal frequency and gas exchange differs in two Blechnum species (Pteridophyta, Blechnaceae) with contrasting ecological breadth
Provedor de dados: 73
Autores: Atala,Cristian; Saldaña,Alfredo; Navarrete,Eduardo.
In Chilean temperate forest, the fern Blechnum chilense has a wide ecological breath, but occur mainly in full sun habitats, while Blechnum mochaenum is restricted only to shady sites. We evaluated if the species with different ecological breath behave similarly in their anatomical and physiological traits. Maximal photosynthetic rate (Amax), Stomatal conductance (g s), evapotranspiration (E), and SLA (specific leaf area) were measured in situ in 20 individuals of each fern species. Additionally, we estimated the stomatal density (SD), stomatal index (SI), and stomatal size in leaves of each sampled individual. B. mochaenum, the shade-tolerant species, had lower SD, SI, A, and E, and higher stomatal size and SLA than B. chilense. Higher stomatal frequency...
Tipo: Journal article
Palavras-chave: Blechnum; Stomatal density; Stomatal index; Stomatal size; Gas exchange; Evergreen temperate forest.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100016

EL CARIOTIPO FUNDAMENTAL EN TRAUBIA MODESTA (PHIL.) RAVENNA (AMARYLLIDACEAE)
Provedor de dados: 73
Autores: Baeza,Carlos M; Novoa,Patricio; Ruiz,Eduardo; Negritto,María A.
The karyotype of Traubia modesta (Phil.) Ravenna was examined. The species has 2n = 2x = 16 chromosomes, with 4m + 12st chromosomes. Traubia presents a very different karyotype in comparison to other genera of Amaryllidaceae from Chile.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200018

FRAGILARIA CAPUCINA DESM. VAR MESOGONGYLA FRENGUELLI, UNA DIATOMEA PRESENTE EN LA ZONA NORTE DE LA CORDILLERA DE LOS ANDES (CHILE), CON COMENTARIOS SOBRE LA VARIABILIDAD DEL NUMERO DE PROCESOS LABIADOS EN ALGUNOS GÉNEROS ARAFIDALES
Provedor de dados: 73
Autores: Rivera R,Patricio; Cruces L,Fabiola.
La diatomeaFragilaria capucina var. mesogongyla, descrita originalmente por Frenguelli desde Calama, Chile (22°28' S, 68°56'W), fue encontrada en una muestra recolectada en el río Lauca, a gran altitud en el norte de Chile (18°30'S, 69°16'W). Por primera vez este taxón se estudia mediante técnicas de microscopía electrónica (SEM). Siendo muy raro para el género Fragilaria, esta variedad presenta un proceso labiado en cada polo valvar (dos por valva). Se entrega una diagnosis corregida, y fotografías ilustran las principales características morfológicas del taxón.
Tipo: Journal article
Palavras-chave: Morfología; Taxonomía; Distribución; Diagnosis corregida.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200002

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

EFFECT OF DENSITY AND FLOWER SIZE ON THE REPRODUCTIVE SUCCESS OF NOTHOSCORDUM GRAMINUM (ALLIACEAE)
Provedor de dados: 73
Autores: Molina-Montenegro,Marco A; Cavieres,Lohengrin A.
The size, form and color are signals used by flowers to attract their pollinators. Large and showy color flowers usually receive higher pollinators visitation rates. According to the optimal forage theory, pollinators would tend to visit flower patches where they obtain the maximum reward regarding the energy expenditure in flower search. In high density patches, flowers are very close each other, hence, flower discrimination by pollinators would tend to be low. In low density patches, however, where the forage effort is greater, larger flowers are usually associated with higher rewards and would receive higher pollinators visitation achieving greater fitness than co-especifics with smaller flowers. In the present study we assessed the effects of flower...
Tipo: Journal article
Palavras-chave: Pollinators visit; Floral traits; Seed output; Fitness.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100004

Hongos liquenizados en morrenas del monte San Lorenzo, Región de Aisén, Chile
Provedor de dados: 73
Autores: VARGAS CASTILLO,REINALDO; MORANO BÜCHNER,CAROLINA.
En el presente trabajo se reportan 30 especies de hongos liquenizados presentes en morrenas de la parte occidental del Monte San Lorenzo en la Región de Aisén, Chile. Se destaca la presencia de Rhizocarpon lecanorinum Anders, nuevo registro para Chile continental.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100014

Espectro polínico y análisis fisicoquímico de mieles de la Región del Biobío, Chile
Provedor de dados: 73
Autores: Navarrete,Carolina; Muñoz-Olivera,Gladys; Wells,Guillermo; Becerra,Julio; Alarcón,Julio; Finot,Víctor L.
RESUMEN Se analizó el espectro polínico y las características fisicoquímicas de 13 muestras de mieles producidas por Apis mellifera en dos áreas con diferente grado de intervención antrópica en la Región del Biobío, Provincia de Ñuble, Chile: a) Depresión Intermedia y b) zonas precordilleranas de la Cordillera de los Andes. Los datos polínicos y físicoquímicos se sometieron a análisis de componentes principales y la diversidad polínica se calculó con el índice de diversidad de Shannon-Weaver (H'). Algunas especies nativas como Gevuina avellana, Lomatia hirsuta, Lithraea caustica y Luma apiculata se encontraron solo en mieles provenientes de San Fabián de Alico (zonas precordilleranas), pero las especies introducidas dominaron el espectro polínico en ambas...
Tipo: Journal article
Palavras-chave: Diversidad específica; Melisopalinología; Miel monofloral.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200268

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

Revisión de la sección Calceolaria (Calceolariaceae) en Chile
Provedor de dados: 73
Autores: PUPPO,PAMELA; NOVOA,PATRICIO.
Calceolaria se caracteriza por sus flores generalmente amarillas, bilabiadas con el labio inferior sacciforme y dos estambres. La sección Calceolaria contiene alrededor de 10 especies, todas herbáceas e higrófilas con una morfología estaminal particular. Las tecas son dimorfas y el conectivo alargado en diversas formas. En Chile sólo dos especies de esta sección, C. pinnata y C. tripartita, fueron reportadas en las diversas publicaciones hechas sobre la flora de este país desde el siglo XVIII. Es más, el uso de nombres inválidos como C. scabiosifolia Roem. &amp;amp; Schult. contribuyeron a la mala identificación de los ejemplares de esta sección confundiendo aún más su taxonomía. El objetivo del presente artículo es hacer la primera revisión de las...
Tipo: Journal article
Palavras-chave: Scrophulariaceae; Calceolarias de agua; Capachitos; UICN.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200007

NUEVOS REGISTROS EXTIENDEN DISTRIBUCIONES DE TRES ESPECIES DE HYMENOPHYLLACEAE (PTERIDOPHYTA) A LA REGION DEL MAULE, CHILE
Provedor de dados: 73
Autores: Stoll,Alexandra; Hahn,Steffen.
This article reports the occurrence of three species of Hymenophyllaceae in the coast range of the Maule region in central Chile. The discovery of Hymenoglossum cruentum (Cav.) K. Presl., Hymenophyllum darwinii Hook.f. ex Bosch y Trichomanes exsectum Kunze at the Fundo San Pedro/ Las Cañas (35°29'S - 72°22'W) represents sizeable extensions of the known ranges of all three ferns, which are mainly associated with humid temperate forests further south. These findings provide further evidence that humid gully habitats in the Mediterranean climate of central Chile harbour many elements of the temperate rainforests which currently dominate landscapes further south.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000100007

Una adición para la flora de Chile: Eremocharis confinis I.M.Johnst. (Apiaceae)
Provedor de dados: 73
Autores: Teillier,Sebastián.
During an expedition to the Inka Trail at Socoroma, Parinacota Province, XV Región of Chile; about 3150 m altitude, we found a population of Eremocharis confinis I.M.Johnst. (Apiaceae-Umbelliferae), a new adding for the flora of Chile. That species was descnbed by I.M. Johnston at neighboring Perú, at a locality named Candarave, at the Departamento de Tacna. With this found, Eremocharis had two species in Chile: the desertic-schrub E.fruticosa Phil. and the new altiplanic E. confinis.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200011

FORMS AND AVAILABILITY OF SOIL PHOSPHORUS IN TEMPERATE FORESTS IN SOUTHERN CHILE AND FLANDERS
Provedor de dados: 73
Autores: Brouwere,Katleen De; Thijs,Ann; Hens,Maarten; Merckx,Roel.
This study investigated the different forms and availability of P in soil profiles from temperate forests in southern Chile (two sites: Nothofagus obliqua (Mirb.) Bl. and Nothofagus betuloides (Mirb.) Oerst.) and Flanders, Belgium (two sites: Pinus nigra Arnold and Betula pendula Roth). Soils were sampled according to genetic horizonation and analysed for organic matter, oxalate-extractable P, Al and Fe, total inorganic P and total organic P. Phosphorus availability was assessed using an isotopic exchange technique and anion exchange membranes. The total P content was higher for the Chilean andosols and remained relatively high in the whole soil profile (1413-187 mg P kg-1) whereas total P decreased sharply in the lower horizons of the Flemish podzols...
Tipo: Journal article
Palavras-chave: Andosols; Phosphorus availability; Podzols.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100004

ROL DEL VERMICOMPOST FRENTE AL ESTRES POR CLORURO DE SODIO EN EL CRECIMIENTO Y FOTOSINTESIS EN PLANTULAS DE TAMARINDO (TAMARINDUSINDICA L.)
Provedor de dados: 73
Autores: Oliva,María A; Rincón,Reiner; Zenteno,Eucario; Pinto,Arturo; Dendooven,Luc; Gutiérrez,Federico.
En el presente estudio se investigó el efecto de complementar turba a diferentes salinidades con vermicompost de excretas de borrego sobre la sobrevivencia, el crecimiento y la fotosíntesis de plántulas de tamarindo (Tamarindus indica), en un experimento en invernadero. Las plantas se cultivaron en sustrato de turba (peat moss) adicionado con 0, 20, 40, 60 y 80 mM de NaCl y complementado con o sin 10% (v/v) de vermicompost. Sin vermicompost, la sobrevivencia de las plantas fue de 20%) en el tratamiento con 80 mM de NaCl, pero con vermicompost la sobrevivencia fue de 85%o. Sin vermicompost el crecimiento de las plantas se redujo en dos veces a 20 mM de NaCl, pero con vermicompost no se encontró efecto inhibitorio. La fotosíntesis se redujo en las plantas en...
Tipo: Journal article
Palavras-chave: Vermicompost; Salinidad; Tamarindo; Fotosíntesis.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100003

VARIACION INTERANUAL EN PRODUCCION DE SEMILLAS DE ALGUNAS ESPECIES ARBOREAS EN CORDILLERA PELADA, CENTRO-SUR DE CHILE
Provedor de dados: 73
Autores: Rosas,Marco; Espinosa,Miguel; Acuña,Eduardo; Sáez,Katia.
Este estudio analiza la variación y sincronización en la producción de semillas de especies arbóreas en dos sitios ubicados en la Cordillera de la Costa, X Región de Chile. Se utilizan los datos publicados por &lt;A HREF="#donoso93"&gt;Donoso (1993)&lt;/A&gt; y &lt;A HREF="#donosoetal93"&gt;Donoso et al. (1993)&lt;/A&gt; sobre producción de semillas de especies arbóreas en dos sitios (correspondientes a los tipos forestales Siempreverde y Alerce) para períodos de 10 y 7 años, respectivamente. Se encontró evidencia de mayor variación en la producción de semillas en el sitio (tipo forestal Alerce) que se encuentra a mayor altitud. En cambio, no hubo diferencia significativa entre especies anemófilas y especies entomófilas. En ninguno de los dos sitios hubo...
Tipo: Journal article
Palavras-chave: Semillación; Sincronía; Síndrome de polinización; Tipo forestal.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000100005

FORMA DE CRECIMIENTO Y CARACTERES ADAPTATIVOS DE DOLICHANDRA CYNANCHOIDES CHAM. (BIGNONIACEAE)
Provedor de dados: 73
Autores: Grosso,M.; Kraus,T.
El objetivo del presente trabajo es estudiar la forma de crecimiento de Dolichandra cynanchoides, especie trepadora característica del bosque serrano de la Provincia de Córdoba (Argentina), e inferir sus caracteres adaptativos. Los estudios se realizaron en su ambiente durante tres años consecutivos y en invernáculo los dos primeros años de vida. La forma de crecimiento de esta especie resulta de la presencia y combinación de los siguientes caracteres: liana perenne, germinación criptohipógea, vástagos aéreos predominantemente ortótropos y subterráneos ligeramente plagiótropos, sinflorescencias constituídas por tirsas con florescencias parciales dicasiales, raíz principal y raíces adventicias. El tallo presenta una estructura anómala, la cual le otorga...
Tipo: Journal article
Palavras-chave: Forma de crecimiento; Dolichandra cynanchoides; Bignoniaceae; Caracteres adaptativos.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000200007

HOMENAJE: Otto Zöllner Schorr 1909-2007
Provedor de dados: 73
Autores: Marticorena,Alicia.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100001

TECOPHILAEA CYANOCROCUS LEYB. (TECOPHILAECEAE) REDESCUBIERTA EN SU HABITAT NATURAL
Provedor de dados: 73
Autores: Eyzaguirre,M. Teresa; García de la Huerta,Rosario.
Tecophilaea cyanocrocus Leyb., es una geófita altoandina endémica de la región Metropolitana de Chile. Fue descrita en 1862. Debido al potencial ornamental de sus flores azules, sus cormos fueron extraídos en grandes cantidades y exportados a Europa. Actualmente es cultivada en muchos países. A partir de la mitad del siglo XX se la considera extinguida en la naturaleza. Se da a conocer el descubrimiento de una población de la especie en las montañas de la Región Metropolitana, en la primavera de 2001
Tipo: Journal article
Palavras-chave: Flora de Chile; Geófita; Especie extinta; Tecophilaea cyanocrocus Leyb.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000200004

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

Myrosmodes nervosa (Orchidaceae, Cranichidinae, subgenus Myrosmodes): a new combination of Myrosmodes to Chile
Provedor de dados: 73
Autores: NOVOA,PATRICIO; VARGAS,CARLOS; CISTERNAS,MAURICIO A.
De acuerdo a datos macromorfológicos y de hábitat se transfiere Altensteinia nervosa Kraenzl. al género Myrosmodes. Se describe la especie y se establece el tipo.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100019

ESTUDIO DE LAS COMUNIDADES FUNGICAS DE LA FILOSFERA DE PINUS TAEDA L. (PINACEAE) I: VARIACION ESTACIONAL
Provedor de dados: 73
Autores: Venedikian,N.; Bonaventura,S. M.; Godeas,A. M.
Estudio de las comunidades fúngicas de la filósfera de Pinus taeda L. (Pinaceae) I. Variación Estacional. Las comunidades fúngicas de las hojas son dinámicas en el tiempo y el espacio. Los patrones de variación espacial y temporal de su composición reflejan el balance sucesivo de procesos poblacionales como inmigración, emigración, crecimiento y muerte de especies. La micoflora de la filósfera de Pinus taeda L. se ha estudiado desde la acícula joven hasta la senescente, en primavera, verano, otoño e invierno, utilizando métodos de lavado y cultivo. Se aislaron 49 taxa fúngicos de los cuales Pestalotiopsis oxyanthi, Alternaria alternata, Cladosporium cladosporioides, C. oxysporum, C. sphaerospermum, Nigrospora oryzae, Epicoccum purpurascens, Hormonema...
Tipo: Journal article
Palavras-chave: Comunidades fúngicas; Filósfera; Pinus taeda; Variación estacional.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000200006

HYPHOMYCETES CELULOLITICOS EN SUELOS DE BOSQUES DE NOTHOFAGUS, TIERRA DEL FUEGO
Provedor de dados: 73
Autores: Martínez,A. E.; Chiocchio,V. M.; Godeas,A. M.
Se estudiaron los hongos celulolíticos asociados a suelos de tres bosques prístinos de Nothofagus (N. pumilio (Poepp. et Endl.) Krasser, N. antarctica (Forst.) Oerst. y N. betuloides (Mirb.) Oerst.) de Tierra del Fuego, determinando la eficiencia celulolítica para cada suelo y taxa usando como fuente de carbono Na CMC (carboximetilcelulosa sódica). Las comunidades fúngicas de celulolíticos se ordenaron usando Análisis de Componentes Principales (PCA). Los dos primeros componentes explicaron el 77.23 % de la varianza entre los bosques, de acuerdo con las frecuencias de las especies fúngicas aisladas. El primer componente estuvo asociado con diferencias en la calidad del recurso (gramíneas en N. antarctica vs madera en N. pumilio y N. betuloides) en la...
Tipo: Journal article
Palavras-chave: Microhongos celulolíticos; Nothofagus; Bosques.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000200003

Recuentos cromosomicos en especies de Hypochaeris L. (ASTERACEAE) de Chile
Provedor de dados: 73
Autores: Baeza,Carlos M.; Grau,Jürke; Vosyka,Emilie; Stuessy,Tod F.; Weiss,Hanna.
Karyotypes of two Chilean taxa of genus Hypochaeris were studied utilizing root-tip-mitotic metaphases. All the populations have karyotypes with 2n = 8 that are very uniform within each species. H. apargioides has a chromosome set 4m + 4st and H. radicata 4m + 2m-sat + 2sm
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100010

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

Revisión de la sección Brevispicae del género Sloanea (Elaeocarpaceae) en Bolivia
Provedor de dados: 73
Autores: Palacios-Duque,Leonardo; Baeza,Carlos M.
Se presenta un catálogo comentado e ilustrado de las especies de la sección Brevispicae del género Sloanea para Bolivia, se reconocen siete especies (S. eichlerii, S. guianensis, S. obtusifolia, S. picapica, S. pubescens, S. spathulata y S. tuerckheimii). Se presenta una clave para separar las especies y para cada una se proporcionan comentarios sobre afinidades taxonómicas, material tipo, distribución, hábitat, nombres comunes y usos.
Tipo: Journal article
Palavras-chave: Corymbo-racemi; Elaeocarpaceae; Flora de Bolivia; Paniculi; Sloanea; Taxonomía.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200007

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

Estudios preliminares de propagación in vitro de una especie endémica de Chile, Vestia foetida (Solanaceae)
Provedor de dados: 73
Autores: Uribe,Matilde E; Delaveau,Catherine; Paredes,Kelly; Carrasco,Pedro; Flores,Cristian.
The in vitro germination of seeds of Vestiafoetida (Ruiz et Pav.) Hoffmanns. and their multiplication was performed. A 20% in vitro germination was obtained. The best proliferation medium was MS supplemented with BAP (1.0 mg L-1) plus AIB (0.01 mg L-1), with an average of 1.7 new axillary buds per microshoot after two subcultures.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100024

EXTENSION DEL LIMITE SUR PARA NOTHOFAGUS GLAUCA (PHIL.) KRASSER
Provedor de dados: 73
Autores: Le-Quesne,Carlos; Sandoval,Luis.
Dentro del género Nothofagus en Chile se reconocen dos especies con problemas de conservación, una de los cuales corresponde a N. glauca. Este árbol se desarrolla en la zona mediterránea de Chile central y se mantiene en poblaciones sometidas a un intenso proceso de fragmentación. La presente nota entrega antecedentes acerca de un rodal localizado en la precordillera andina, 100 km al sur del límite de distribución conocido para la especie. Se comentan aspectos sobre la estructura del rodal y la importancia de procurar la conservación de este enclave
Tipo: Journal article
Palavras-chave: Conservación; Fragmentación forestal; Población marginal; Nothofagus; Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000200005

NUEVA LOCALIDAD GEOGRAFICA PARA BERBERIS NEGERIANA TISCHLER (BERBERIDACEAE) EN LA PROVINCIA DE ARAUCO, REGION DEL BIO-BIO, CHILE
Provedor de dados: 73
Autores: Gómez,Persy; Belov,Michail; San Martín,José.
This note reports the finding of a population of Berberis negeriana Tischler (Berberidaceae), in the province of Arauco, Bío-Bío Region (37°42'17" S y 73°19'43" W) in the center south of Chile. The population was found between Nothofagus obliqua and species of the Valdiviano Forest.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100010

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

Reproductive biology aspects of two species of the genus Gavilea (Orchidaceae, Chloraeinae) in populations from Central Chile
Provedor de dados: 73
Autores: Valdivia,Carlos E; Cisternas,Mauricio A; Verdugo,Gabriela S.
The extent to which plants depend on pollinators for outcross pollen transportation is a key issue in plant reproductive ecology. We evaluated the putative breeding system, foral display, and natural pollination in two Southern Cone of South American orchids, Gavilea araucana and G. venosa, by performing four hand pollination trials (agamospermy, autogamy, geitonogamy, and xenogamy tests) and by counting each fower and fruit produced by plants in natural conditions. Fruit set differed signifcantly depending on the origin of pollen as well as on the presence of a pollen vector. None of these species produced fruits by the agamospermy tests, therefore indicating that they require the presence of pollen on the stigmas for fruit setting. By contrast, only G....
Tipo: Journal article
Palavras-chave: Autogamy; Allogamy; Self-compatibility; Foral display; Fruiting patterns.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100005

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

Revisión del género Pseudognaphalium (Asteraceae, Gnaphalieae) en Chile
Provedor de dados: 73
Autores: FREIRE,SUSANA E.; BAYÓN,NÉSTOR D.; BAEZA,CARLOS M.; GIULIANO,DANIEL A.; MONTI,CLAUDIA.
El género Pseudognaphalium, con cerca de 90 especies de distribución cosmopolita, es uno de los géneros de la tribu Gnaphalieae con mayor número de especies, principalmente distribuidas en América del Sur, Central y del Norte, aunque algunas también están presentes en Asia y África. Este trabajo comprende la revisión de 12 especies de Pseudognaphalium para Chile, P. aldunateoides, P. cabrerae, P. cheiranthifolium, P. cymatoides, P. gayanum, P. lacteum, P. landbeckii, P. munoziae, P. psilophyllum, P. remyanum, P. tarapacanum y P. viravira. Se incluye una clave para identificarlas y para cada una de las especies se brinda descripción, ilustración, fenología, distribución geográfica y hábitat, mapa de distribución, material adicional examinado y afinidades...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100010

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

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

In vitro germination and development of two endangered endemic Colombian orchids Cattleya mendelii and Cattleya quadricolor
Provedor de dados: 73
Autores: DÍAZ-ÁLVAREZ,EDISON ARMANDO; TORRES-GALEANO,CAROLINA; ROJAS-CORTÉS,ÁNGELA PATRICIA; DE LA BARRERA,ERICK.
Cattleya mendelii and C. quadricolor are endemic orchids from Colombia, which have been subjected to extraction from their natural environments for commercial purposes, becoming critically endangered. However, there is no sustainable management practice for the conservation of these species. The aim of this study was to establish a protocol of in vitro culture for both species. The effects of different combinations of GA3 and NAA amending MS and KC culture media were assessed for the in vitro germination and plant growth. Plant development was assessed monthly over 120 days. A higher percentage of explant production for both species was observed with MS than KC. The higher GA3 proportion of 1.5 &amp;#956;M resulted in enhanced germination, while the higher...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200005

Prof. em. Dr. Dr. h. c. Eleonore Steubing 1.2.1922 - 1.1.2012
Provedor de dados: 73
Autores: Alberdi L,Miren; Godoy B,Roberto.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100001

Intercambio gaseoso de dos clones de Paulownia elongata x fortunei al primer año de desarrollo vegetativo en tres sitios del centro-sur de Chile
Provedor de dados: 73
Autores: Salguero,David; Muñoz,Fernando; Cancino,Jorge; Flórez,Viviana; Rubilar,Rafael; Acuña,Eduardo; Olave,Rodrigo.
RESUMEN Las especies del género Paulownia (Paulowniaceae) presentan alta tasa de asimilación de CO y eficiente utilización de flujos de fotones fotosintéticos (PPFD), lo que les permite alcanzar altas tasas de crecimiento. Se investigó la respuesta de intercambio gaseoso, al primer año de desarrollo vegetativo, de dos clones de Paulownia elongata x fortunei establecidos en tres sitios de condiciones edafoclimáticas diferentes (Trehualemu, El Vergel y La Isla) ubicados en las Regiones del Maule y del Biobío, en Chile central. El intercambio gaseoso se midió mensualmente en seis hojas (de plantas diferentes) por clon por sitio, utilizando PPFD de 1500 ± &amp;#956;mol fotones/m2/s, determinando fotosíntesis neta (An), transpiración (E), conductancia...
Tipo: Journal article
Palavras-chave: Respuesta fisiológica; Fotosíntesis; Curva de luz; Paulowniaceae.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200438

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

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

Phenotypic diversity of date palm cultivars (Phoenix dactylifera L.) from Algeria
Provedor de dados: 73
Autores: SIMOZRAG,AHMED; CHALA,ADEL; DJEROUNI,AISSA; ELMONCEF BENTCHIKOU,MOUHAMAD.
The aim of this work is to evaluate the phenotypic diversity of date palm (Phoenix dactylifera L.). This study shows that Biskra region has an interesting biodiversity. This latest was conducted during the growing palm groves since 3 years (2010, 2011 and 2012) in Biskra, on 89 date palm varieties, to identify their distinctive phenotypic characteristics. Seventeen physical parameters have been examined, including 4 relative to vegetative growth, and 13 to the fruits at the date parameters stage. The main components analysis was used to identify the differences and similarities between the parameters studied. The principal component analysis showed that morphological characters for fruits should be used for identifications and descriptions of date palm...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100006

PRESENCIA DE ROMULEA ROSEA (L.) ECKL. (IRIDACEAE: CROCOIDEAE) ADVENTICIA EN CHILE, E INVALIDACIÓN DE CALYDOREA CHILENSIS M.MUÑOZ
Provedor de dados: 73
Autores: Roitman,Germán; Muñoz-Schick,Mélica; Eyzaguirre,María T.
Romulea rosea (Iridaceae: Crocoideae), a species original of South Africa, is cited for the first time for Chile. The species is described, and therefore Calydorea chilensis M.Muñoz published recently, is reduced to nomenclatural synonym.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200016

EL CARIOTIPO FUNDAMENTAL EN RHODOLIRIUM SPECIOSUM (HERB.) RAVENNA Y R. ANDICOLA (POEPP.) RAVENNA (AMARYLLIDACEAE)
Provedor de dados: 73
Autores: Baeza,Carlos M; Mariangel,Camila; Ruiz,Eduardo; Negritto,María.
The karyotype of Rhodolirium speciosum (Herb.) Ravenna and R. andícola (Poepp.) Ravenna were examined. The species have 2n = 2x = 16 chromosomes, with 4m + 3sm + 1st chromosomes. Both species present a very different karyotype in comparison to other Amaryllidaceae from Chile.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100011

Intraespecific variation in drought resistance of Nothofagus antarctica (G. Forst.) Oerst. (Nothofagaceae)
Provedor de dados: 73
Autores: PIPER,FRIDA I; ZÚÑIGA-FEEST,ALEJANDRA.
Futuros escenarios climáticos limitarían el establecimiento de plántulas en bosques de los Andes del sur debido al estrés hídrico. Comparamos la resistencia a la sequía de plántulas de Nothofagus antarctica de dos límites arbóreos: Termas de Chillán (clima mediterráneo) y Antillanca (clima superhúmedo). También comparamos la resistencia a la sequía de plántulas de dos altitudes diferentes de Antillanca. No encontramos diferencias en resistencia a la sequía entre plántulas de los dos límites arbóreos. Las plántulas del límite arbóreo de Antillanca resultaron más resistentes que las de una menor elevación.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200013

INFLUENCIA DE LOS HONGOS MICORRIZICOS ARBUSCULARES SOBRE EL CRECIMIENTO DE VITRO PLÁNTULAS DE PINA (ANANAS COMOSUS (L.) MERR.) CON DIFERENTES NIVELES DE FOSFORO
Provedor de dados: 73
Autores: Gutiérrez-Oliva,Vicente Federico; Abud-Archila,Miguel; Flores-Pérez,Aura; Alvarez-Solis,José David; Gutiérrez-Miceli,Federico Antonio.
El objetivo del trabajo fue evaluar el efecto de dos hongos micorrízicos arbusculares (HMA) a diferentes concentraciones de fósforo sobre la sobrevivencia y el crecimiento de plántulas de pina {Ananas comosus (L.) Merr.) obtenidas por micropropagación. Las plántulas se multiplicaron masivamente en cultivos in vitro y se aclimataron gradualmente bajo un esquema de estrés por temperatura en tres etapas secuenciales. Los efectos de los HMA y el fósforo no fueron significativos sobre la sobrevivencia y la altura de las plántulas, sin embargo, Glomus claroideum estimuló que las plántulas tuvieran mayor número de hojas y peso seco. Los resultados sugieren que la altura de las plántulas fue mayor cuando fueron cultivadas con G. claroideum y 0,9 mM de fósforo.
Tipo: Journal article
Palavras-chave: Hongos micorrízicos arbusculares; Fósforo; Pina; Optimización.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100001

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

MORPHOLOGY OF THE SYMMETRICAL MORPHOTYPES OF CENTRONELLA REICHELTII VOIGT (FRAGILARIACEAE, BACILLARIOPHYCEAE) FROM PATAGONIAN ENVIRONMENTS
Provedor de dados: 73
Autores: Echenique,Ricardo O.; Guerrero,José M.
The ultrastructure of symmetrical valves of Centronella reicheltii Voigt, resembling the former C. rostafinskii Woloszynska, is studied for the first time, and their morphology is compared with the asymmetrical forms. Valve morphology and morphometry of both morphotypes are similar and only differ in the shape and striation pattern of the valve centre and the arrangement of the arm bases. However, since they occur in environments with different trophic status, the new combination C. reicheltii f. rostafinskii is proposed for the symmetrical valves, because this distinction may provide ecologically useful information.
Tipo: Journal article
Palavras-chave: Trophic status; Diatoms; Taxonomy; Morphological variability; Ultrastructure.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000100003

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

Nuevos registros extienden el limite Septentrional de once Especies Valdivianas al norte del Rio Maule, Chile
Provedor de dados: 73
Autores: Stoll,Alexandra; Hahn,Steffen.
El presente artículo da cuenta del hallazgo de once especies propias de los bosques templado-húmedos al norte del Río Maule, en las quebradas del Estero La Puerta (35°19'02"S / 72°15'39"W) y del Estero Infernillo (35°14'15" S / 72°10'20" W) en la Cordillera de la Costa de la VII Región, Chile. Hoy en día el Río Maule es asumido como una barrera natural para la distribución de muchos elementos de los bosques templados, los cuales en la actualidad caracterizan los paisajes del sur del país. Por estas razones la presencia de estas especies en el Estero La Puerta y el Estero Infernillo no solamente implican una extensión de su área de distribución conocida, sino que además entrega nuevas evidencias a la discusión científica acerca del alcance de las...
Tipo: Journal article
Palavras-chave: Biogeografía; Bosque templado húmedo; Presencia relictual; Chile central.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100011

Ultrastructural and molecular characterization of Tetraselmis strains (Chlorodendrophyceae, Chlorophyta) isolated from Chile
Provedor de dados: 73
Autores: GONZÁLEZ,MARIELA A.; AGUAYO,PAULA A.; INOSTROZA,INGRID DE L.; CASTRO,PABLO A.; FUENTES,GLENDA A.; GÓMEZ,PATRICIA I.
Species of the genus Tetraselmis (Chlorodendrophyceae, Chlorophyta) have traditionally been used in aquaculture facilities as food for larval varieties of marine organisms. Recently, some strains with high lipid content have been considered as having potential for biofuel production. Although many Tetraselmis species are relatively well-characterized using light and electron microscopical methods, there are still taxonomic ambiguities among the species. DNA sequence analysis, which provides a reliable and more convenient tool for species delimitation, has been poorly used in Tetraselmis. In this study, three strains of Tetraselmis, isolated from coastal Chilean waters, have been characterized using an integrative approach (light and electron microscopy,...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100007

Mulinum ulicinum (Azorelloideae, Apiaceae), nueva cita para Chile
Provedor de dados: 73
Autores: FERNÁNDEZ,MARTINA; EZCURRA,CECILIA; CALVIÑO,CAROLINA I.
Mulinum ulicinum is recorded for the first time in Chile. This species and M. crassifolium are the only two species of the genus growing in the Region of Antofagasta. A description and illustration of M. ulicinum is provided, as well as a key to differentiate it from M. crassifolium.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200009

Mario Ricardi Salinas (1921-2005): Creador de la Revista Gayana Botanica
Provedor de dados: 73
Autores: Rodríguez R.,Roberto; Palma H.,Sylvia.
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100001

Incendios Forestales (2012)
Provedor de dados: 73
Autores: Gómez-González,Susana.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200020

Nuevas combinaciones en los géneros sudamericanos Lepidaploa y Lessingianthus (Vernonieae, Asteraceae)
Provedor de dados: 73
Autores: ANGULO,MARÍA BETIANA; VEGA,ÁLVARO JOSÉ; DEMATTEIS,MASSIMILIANO.
Los géneros Lepidaploa (Cass.) Cass. y Lessingianthus H. Rob. (Vernonieae, Asteraceae) fueron establecidos para separar a las especies inicialmente ubicadas en Vernonia Schreb. sect. Lepidaploa (Cass.) DC. subsect. Axilliflorae Benth. &amp;amp; Hook. y Vernonia sect. Lepidaploa subsect. Macrocephalae Benth. &amp;amp; Hook., respectivamente. Tal como se delimitan actualmente, Lepidaploa está compuesto por alrededor de 150 especies ampliamente distribuidas en Sudamérica, mientras que Lessingianthus presenta 120 especies con una gran concentración en el sudeste de Brasil. Se estima que gran cantidad de especies todavía incluidas en Vernonia no han sido estudiadas apropiadamente y en consecuencia su posición y estatus taxonómicos permanecen inciertos. En este...
Tipo: Journal article
Palavras-chave: Vernonia; Lepidaploinae; Vernoniinae; Sistemática.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200006

Vascular plant assemblages of ephemeral wetland vegetation along the Mediterranean-temperate gradient in Chile
Provedor de dados: 73
Autores: ALVAREZ,MIGUEL; DEIL,ULRICH.
Plant species composition and geographical distribution of vernal pools in Mediterranean Chile are poorly studied. In order to overcome this gap we collected 73 floristic samples in the Mediterranean-temperate gradient from Chile (31- 44°S). Additionally, we carried out an exhaustive collection of published phytosociological relevés made in this area including some relevés from the East side of the Andes in Argentina. The resulting dataset contains 228 observations of 269 species. Hierarchical clustering was applied in order to get co-occurrence assemblages. These sets were compared with diagnostic groups defined a priori, life forms and their status in South America (introduced vs native species). In order to detect geographic and climatic distribution...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200002

Growth promotion of Pinus radiata seedlings by soil inoculation and seed pretreatment with the biological control agent Clonostachys rosea
Provedor de dados: 73
Autores: Moraga-Suazo,Priscila; Sanfuentes,Eugenio.
ABSTRACT Twenty-one Clonostachys rosea strains, previously selected by its biocontrol activity higher than 80% against Fusarium circinatum, were evaluated for its ability to promote growth of Pinus radiata seedlings on natural substrate. Stem height, root length, dry weight of stem and roots, and ectomycorrhization were measured at 102 days after seeding. The results showed significant differences between some of the tested C. rosea strains when compared to the controls, showing increases for plant height of 25%, dry stem mass of 37%, root length of 13.5%, dry root mass of 20.5% and ectomycorrhization of 55% when compared to their respective controls, demonstrating a possible dual use of these strains for both plant protection and increased biomass of P....
Tipo: Journal article
Palavras-chave: Biocontrol agents; Biofertilizers; Growth promoters; Nurseries.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100140

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

RISK ASSESSMENT OF AGRICULTURAL INTENSIFICATION ON N DEPOSITION ON PRISTINE FORESTS AND PLANTATIONS IN SOUTHERN CHILE
Provedor de dados: 73
Autores: Boeckx,P; Paulino,L; Godoy,R.
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200001

PTERIDOFITAS EPIFITAS ENCONTRADAS EN CYATHEACEAE Y DICKSONIACEAE DE LOS BOSQUES NUBLADOS DE VENEZUELA
Provedor de dados: 73
Autores: Cortez,Lucía.
Se presenta una clave de los géneros y una lista de las especies de Pteridofitas que crecen como epífitas en las raíces y tallos de los helechos arborescentes de las familias Cyatheaceae y Dicksoniaceae, en los bosques nublados de Venezuela
Tipo: Journal article
Palavras-chave: Cyatheaceae; Dicksoniaceae; Epífita; Pteridófita; Venezuela.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100002

First record of Lingulodinium polyedrum (Dinophyceae) resting cysts in coastal sediments from the Inner Sea of Chiloé, Los Lagos Region, southern Chile (&amp;#126;41°-43°S)
Provedor de dados: 73
Autores: Salgado,Pablo; Troncoso,Víctor A; Montresor,Marina; Salamanca,Marco; Lange,Carina B.
Quistes de resistencia del dinoflagelado potencialmente tóxico Lingulodinium polyedrum (Stein) Dodge son registrados por primera vez en sedimentos costeros del Mar Interior de Chiloé. Se entrega información de abundancia, distribución, descripción y fotomicrografías de la especie. Se confirma la presencia de L. polyedrum en aguas costeras del sur de Chile.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100012

Study and rehabilitation of some endemic Argentinian taxa in the genus Viola L. (Violaceae), and lectotypification of a Peruvian species
Provedor de dados: 73
Autores: WATSON,JOHN M; FLORES,ANA R.
Taxa of Viola sect. Andinium are detailed. W. Becker described new violas collected by H.F. Comber in 1925-1926. Sixty years later R.A. Rossow treated them in Flora Patagonica. His views have subsequently been followed in Argentina and influence taxonomic decisions taken there. Three of Comber's species not included or accepted by Rossow are rehabilitated. V. comberi, synonymised by him, differs critically from all related taxa in its unique set of characters. He placed V. cotyledon subsp. lologensis in synonymy under V. dasyphylla. As it combines equally defining features of that species and V. cotyledon, it is elevated to full species rank here. V. escondidaensis, a distinct taxon with no close relatives, was omitted from Flora Patagonica. It may be...
Tipo: Journal article
Palavras-chave: Adaptation; Andean; Northern Patagonia; Rarity; Taxonomic boundaries; Type specimens; Untraceable taxa.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200017

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

Nuevo hallazgo de Miersia cornuta Phil. (Gilliesieae-Alliaceae)
Provedor de dados: 73
Autores: Escobar,Inelia; Novoa,Patricio; Ruiz,Eduardo; Negritto,María; Baeza,Carlos.
A new discovery of Miersia cornuta Phil. from Valparaiso Region, Chile, is presented. Details of fower and fruit has been unclear, what has caused this taxon has been considered a doubtful species. The complete description, commentaries, new localities of this endemic species, and a key for Miersia species are given.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100012

Estado de conservación de Eulychnia iquiquensis (Schumann) Britton et rose (Cactaceae) en el extremo norte de Chile
Provedor de dados: 73
Autores: Pinto,Raquel.
Se da a conocer el estado actual de las poblaciones de Eulychnia iquiquensis (Cactaceae) en las serranías costeras del extremo norte de Chile. Se registraron diez ecosistemas de niebla con presencia de esta especie, cinco de ellos con ejemplares vivos. Actualmente éstos se distribuyen en el acantilado costero entre 18º 38'S - 70º 20'W y 21º 23'S - 70º 03'W, entre los 600 y 1.000 m de altitud. Se analizan aspectos morfológicos y fenológicos, así como el tamaño poblacional, densidad, estructura de talla y estado de conservación de cada una de las poblaciones. Se registraron individuos vivos en todas las edades desde 0,05 a 10 m de alto con un promedio de 2,2 m de alto. En general el número poblacional no es mayor de 20 ejemplares vivos por ecosistema,...
Tipo: Journal article
Palavras-chave: Poblaciones; Eulychnia iquiquensis; Ecosistemas de niebla costeros; Arica; Iquique; Norte de Chile.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100010

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

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

RELACIONES FITOGEOGRÁFICAS DE LAS ESPERMATÓFITAS EN LAS PLUVISILVAS DE LA REGIÓN ORIENTAL DE CUBA
Provedor de dados: 73
Autores: Martínez-Quesada,Eddy.
Se realizó un estudio de la distribución de las espermatófitas que habitan en las pluvisilvas de la Región Oriental de Cuba, con el objetivo de conocer principalmente sus relaciones con otros sectores y distritos de Cuba así como con otras provincias florísticas de la Región Caribe. Para obtener la distribución de las especies se revisó la bibliografía especializada y en el caso de las especies endémicas se consultó además una base de datos. Cada endemismo se clasificó según el criterio de López et al. (1994a) y se ubicó en las diferentes unidades fitogeográficas de Cuba según Samek (1973). La clasificación de las disyunciones se realizó según el criterio de Borhidi (1991). En el caso de las especies no endémicas se hizo una separación entre los taxones...
Tipo: Journal article
Palavras-chave: Fitogeografía; Bosques pluviales; Endemismo; Región Oriental de Cuba.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200006

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

INFLUENCE OF ARBUSCULAR MYCORRHIZAL FUNGIES AND A NATIVE DIAZOTROPHIC BACTERIA IN SURVIVAL AND TUBERIZATION OF EX VITRO POTATO PLANTS
Provedor de dados: 73
Autores: Palacios,Gabriela; Abud,Miguel; Salvador,Miguel; Adriano,Lourdes; Dendooven,Luc; Gutiérrez,Federico Antonio.
The inoculation of several species of micropropagated plantlets with native diazotrophic bacteria and arbuscular mycorrhizal fungi has been reported to increase growth and survival percentage compared to plantlets without inoculation. The survival of in vitro developed potato (Solarium tuberosum L. cv. Alfa) plantlets co-inoculated with Glomus fasciculatum (Thaxter sensu Gerd.) Gerd &amp;amp; Trappe, G. claroideum (Schenck &amp;amp; Smith emend. Walker &amp;amp; Vestberg) and a native diazotrophic bacteria was evaluated at room temperature (16-35°C) or in a growth chamber (20-22°C). Obtained plantlets for micropropagation were placed in a peat moss/agrolite (2:1 v/v) mixture, inoculated with arbuscular mycorrhizal (AM) fungi (2250 spores plant"') and...
Tipo: Journal article
Palavras-chave: Glomus claroideum; Glomus fasciculatum; Minituber production; Potato micropropagation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200002

Propagación vegetativa de Berberidopsis corallina Hook.f., una especie en peligro de extinción, endémica de Chile
Provedor de dados: 73
Autores: URIBE,MATILDE E; DURÁN,RICARDO; BRAVO,GASTÓN; MORA,FREDDY; CARTES,PRISCILA; DELAVEAU,CATHERINE.
Berberidopsis corallina es una planta trepadora endémica de Chile catalogada "en peligro de extinción" y que hoy se encuentra en problemas de conservación, debido al escaso número de poblaciones y a su difícil reproducción por semillas. El objetivo del presente trabajo fue evaluar su capacidad de enraizamiento de estacas recolectadas en distintas épocas del año y utilizando diferentes concentraciones de la auxina ácido 3-indolbutírico. Las muestras se obtuvieron de plantas madres que crecen en Trongol Bajo (Curanilahue 37°28' S; 73°20' O, provincia de Arauco) en época de verano, otoño e invierno de 2006. Estacas de 8-10 cm de longitud fueron tratadas bajo inmersión rápida a diferentes concentraciones de ácido 3-indolbutírico (0, 500, 1.500, 3.000, 5.000...
Tipo: Journal article
Palavras-chave: Ácido 3-indolbutírico; Berberidopsis corallina; Enraizamiento adventicio; Época de colecta.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200003

RECUENTOS CROMOSOMICOS EN PLANTAS QUE CRECEN EN CHILE. III
Provedor de dados: 73
Autores: Baeza,Carlos M; Schrader,Otto; Terrab,Anass; Stuessy,Tod; Rosas,Marcelo; Ruiz,Eduardo; Negritto,María; Urtubey,Estrella.
Se entregan datos citológicos del número cromosómico diploide de 24 especies de la flora vascular de Chile, utilizándose material de raíces provenientes de plántulas. Nuevos registros para la flora de Chile son: Alstroemeria presliana Herb. subsp. presliana (2n = 16), Chaetanthera moenchioides Less. (2n = 26), Hypochaeris scorzonerae (DC.) F.Muell. (2n = 8), Phycella bicolor (Ruiz et Pav.) Herb. (2n = 16) y Rhodophiala tiltilensis (Traub et Moldenke) Traub (2n = 16).
Tipo: Journal article
Palavras-chave: Números cromosómicos; Flora vascular de Chile.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200002

Variación altitudinal de los atributos morfo-fisiológicos en dos especies de plantas alto-andinas y sus implicancias contra la fotoinhibición
Provedor de dados: 73
Autores: Molina-Montenegro,Marco A; Cavieres,Lohengrin A.
Los ambientes de alta-montaña se caracterizan por presentar condiciones climáticas adversas para el desarrollo de las plantas. Dentro de estas condiciones climáticas destacan las bajas temperaturas del aire y del sustrato, la alta radiación lumínica y el défcit hídrico. Se ha documentado que la alta radiación lumínica y las bajas temperaturas típicas de la alta-montaña serían propicias para la fotoinhibición. No obstante, existen muchas plantas que pueden distribuirse de manera exitosa sobre gradientes altitudinales, sugiriendo la presencia de estrategias para lidiar con las condiciones climáticas adversas. En el presente estudio se evaluaron diferentes estrategias fotoprotectoras tanto morfológicas como fsiológicas que poseen las especies Taraxacum...
Tipo: Journal article
Palavras-chave: Ángulos foliares; Bajas temperaturas; Ciclo de las xantóflas; Foto-protección; Los Andes.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100001

LECANOPHORA SUBACAULE KRAPOV. (MALVACEAE): NUEVO REGISTRO PARA LA FLORA DE CHILE
Provedor de dados: 73
Autores: Domínguez,Erwin; Elvebakk,Arve.
Se da cuenta del hallazgo de Lecanophora subacaule Krapov. (Malvaceae), colectada por primera vez en Chile en el Parque Nacional Pali Aike, ubicado en la provincia de Magallanes, XII Región. Se entrega la descripción de la especie y se indica su distribución en Argentina y Chile
Tipo: Journal article
Palavras-chave: Lecanophora subacaule; Patagonia; Estepa; Parque Nacional Pali Aike; Magallanes; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100007

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

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

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

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

First report of a surf zone diatom accumulation in the Eastern South Pacific: Aulacodiscus kittonii Arnott ex Ralfs (Bacillariophyta) as the dominant and exclusive species
Provedor de dados: 73
Autores: RIVERA,PATRICIO; CRUCES,FABIOLA; GALLARDO,VÍCTOR A.
The so-called "surf diatoms" constitute a small group of species that are present with great abundance in the surf zones of some sandy beaches where often the accumulations are dominated only for one of these species. They adhere to air bubbles generated by wave action forming green or brown patches that float in the surf zone, remaining as long streaks on the beach. In May 2015 a green accumulation was detected in Coquimbo Bay in northern Chile. The study of samples with light and electron microscopy techniques showed the presence of Aulacodiscus kittonii, a well-known surf diatom. This is the first report of this kind for Chile and for the whole coast of the Eastern South Pacific Ocean with A. kittonii as the dominant species. It is also the first report...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100001

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

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

Laetisaria fuciformis (Basidiomycota, Corticiaceae), nuevo registro de un parásito fúngico sobre gramíneas en el sur de Chile
Provedor de dados: 73
Autores: Palfner,Götz; Marticorena,Alicia; Medina,Marcelo.
A new record of the fungal grass parasite Laetisaria fuciformis from southern Chile is described and its biology is briefly discussed.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200013

NITROGEN EXPORT FROM FORESTED AND AGRICULTURAL WATERSHEDS OF SOUTHERN CHILE
Provedor de dados: 73
Autores: Oyarzún,Carlos E.; Huber,Anton.
Measuring nutrients fluxes in watersheds with different landuse is important for evaluating the effects of conversion of native forests to agricultural land, and for establishing guidelines for land management. Nitrogen (N) concentrations and fluxes were studied over a 12-month period in four watersheds in the Lake Rupanco basin in the Andean Cordillera and four watersheds located in the Lake Huillinco basin in the Coastal Cordillera of southern Chile. Two watersheds in either lake basins were covered mainly by native rainforests, and the other two had mixed landuse (livestock pastures, subsistence agriculture and shrub-pasture mixtures). In the Lake Rupanco area, the annual transport of NO3-N from forested and agricultural watersheds was 4.9 and 11.0 kg...
Tipo: Journal article
Palavras-chave: Landuse; Native forest; Nitrogen fluxes; Non-point pollution.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100010

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

New records of Discomycetes (Pezizales) for the Chilean mycobiota
Provedor de dados: 73
Autores: SANDOVAL,PABLO.
Se adicionan a la micobiota chilena tres especies de Pezizales, Byssonectria terrestris (Alb. &amp;amp; Schwein.) Pfister, Pseudoplectania nigrella (Pers.) Fuckel y Pseudoplectania sphagnophila (Pers.) Kreisel, Se describen e ilustran los caracteres diagnósticos y se realizan comentarios acerca de las especies.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200017

New distributional records for Chilean bryophyte and lichen flora
Provedor de dados: 73
Autores: León,Carolina A; Oliván,Gisela; Pino-Bodas,Raquel.
Ten new distributional records to the Chilean bryo-lichenic flora are reported. Three species and a subspecies are new to the flora of the province of Chiloé, five species are new from the Los Lagos Region and one species is new to mainland Chile. The specimens were collected in peatlands (Sphagnum bogs) and swamp forests of Tepualia stipularis in Isla Grande de Chiloé (Chile) (41°- 43° S; 74°-73° W). Diagnostic characters, chemistry (only lichens), habitats preferences and distribution are provided. The national ranges of two species are expanded.
Tipo: Journal article
Palavras-chave: New records; Southern South America; Mosses; Liverworts; Lichens.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200005

La diversidad florística del humedal "Ciénagas del Name" (Región del Maule) comparada con otros humedales costeros de Chile
Provedor de dados: 73
Autores: RAMÍREZ,CARLOS; FARIÑA,JOSÉ MIGUEL; CONTRERAS,DOMINGO; CAMAÑO,ANDRÉS; SAN MARTÍN,CRISTINA; MOLINA,MARLENE; MORAGA,PAULINA; VIDAL,OSVALDO; PÉREZ,YÉSSICA.
Se estudia la flora del humedal de las Ciénagas del Name (Cauquenes, Región del Maule, Chile), sobre la base de su composición sistemática, origen y espectro biológico. Se registraron 138 especies, con predominancia de nativas. Taxonómicamente la flora está integrada por 5 clases, 55 familias y 121 géneros, representando la mayor diversidad florística registrada para los humedales costeros de la zona central de Chile. Fanerófitos, hemicriptófitos y terófitos se encontraron en proporciones equivalentes, lo que se corresponde con el clima Mediterráneo del área. Los macrófitos representan sólo un 14,49% de la flora total y entre ellos dominan la planta sumergida Ceratophyllum chilense y la emergida Schoenoplectus californicus. La comparación florística con...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100011

Licofitas (Equisetopsida: Lycopodiidae) de las Sierras Centrales de Argentina: un enfoque panbiogeográfico
Provedor de dados: 73
Autores: Arana,Marcelo D; Morrone,Juan J; Ponce,Mónica; Oggero,Antonia J.
Las licofitas son las plantas vasculares más antiguas, comprenden a las Lycopodiaceae, Isoëtaceae y Selaginellaceae, constituyendo un grupo monofilético separado del resto de los helechos y plantas con semilla. Debido a su falta de relaciones coevolutivas con vectores bióticos, su monofilia y su patrón morfológico altamente estable son especialmente aptas para establecer patrones biogeográficos. Con este fin se construyeron los trazos individuales de los siete taxones encontrados. El trazo generalizado resultante indica que las sierras centrales de Argentina constituyen el extremo austral de un componente biótico neotropical, presentando una relación más estrecha con las Sierras Subandinas y los Andes bolivianos y peruanos que con el Chaco (donde están...
Tipo: Journal article
Palavras-chave: Biogeografía; Lycopodiaceae; Selaginellaceae; Isoëtaceae; Chaco serrano.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100002

Fenología reproductiva de Pouteria splendens (Sapotaceae)
Provedor de dados: 73
Autores: HENRÍQUEZ,CAROLINA A; SOTES,GASTÓN J; BUSTAMANTE,RAMIRO O.
Pouteria splendens (A.DC.) Kuntze (lúcumo silvestre, palo colorado) es un arbusto endémico con problemas de conservación de Chile central. Es la única especie representante de la familia Sapotaceae en el país y se conoce muy poco de su ciclo de vida. Se estudió su fenología reproductiva durante la primavera y verano, desde septiembre 2007 hasta abril 2008, en la población remanente más grande, localizada en Los Molles (V Región de Valparaíso). Se encontró un incremento en la producción de yemas florales, flores y frutos desde septiembre a febrero, decayendo en marzo. Al igual que en otras especies de ambientes mediterráneos, el máximo en la formación de botones florales, flores y frutos ocurrió en época de verano, durante febrero. También detectamos una...
Tipo: Journal article
Palavras-chave: Planta amenazada; Floración; Fructificación; Lúcumo silvestre.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200004

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

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

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

ESTUDIO ANATOMICO DE VASTAGOS REPRODUCTIVOS EN BROMUS AULETICUS Trin. ex Ness (POACEAE)
Provedor de dados: 73
Autores: Ramos,J. C.; Tivano,J. C.; Vegetti,A. C.
El objetivo de este trabajo es caracterizar las variaciones anatómicas que se presentan en órganos foliares y caulinares de vástagos reproductivos de Bromus auleticus Trin. ex Ness. Las muestras fueron fijadas en F.A.A., incluidas en parafina-cera, cortadas con micró-tomo rotativo, coloreadas con safranina-fast green en carboxilol y montadas en bálsamo de Canadá. Además, muestras de material fresco fueron cortadas con micrótomo de congelación y luego de la deshidratación se las coloreó del modo antes descripto, agregándole un pasaje en xilol con eugenol, para montarlas finalmente en bálsamo de Canadá. Se caracterizan las estructuras foliares y caulinares desde el rizoma hasta el ámbito de la inflorescencia. Se describen las variaciones anatómicas...
Tipo: Journal article
Palavras-chave: Anatomía foliar; Anatomía reproductiva; Gramíneas.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000200001

Revisión taxonómica del género Eragrostis Wolf en Chile, basada en análisis estadísticos multivariados
Provedor de dados: 73
Autores: Escobar,Inelia; Ruiz,Eduardo; Finot,Víctor L; Negritto,María A; Baeza,Carlos M.
Eragrostis Wolf es un género cosmopolita que incluye alrededor de 350 especies, distribuidas principalmente en regiones tropicales y subtropicales. Debido al amplio rango de variación morfológica dentro del género, los límites específicos frecuentemente se sobreponen, siendo muy difícil establecer caracteres diagnósticos para delimitar las especies. Para Chile se han citado entre 10 y 15 taxones. El objetivo fue realizar una revisión de las especies del género Eragrostis que crecen en Chile, complementada con el uso de técnicas estadísticas multivariadas (análisis de conglomerados y análisis de coordenadas principales). Se determinó la presencia en Chile de 12 especies, 2 variedades y una subespecie. Ocho taxones son nativos y cuatro son introducidos. Se...
Tipo: Journal article
Palavras-chave: Poaceae; Análisis de coordenadas principales; Análisis de conglomerados.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100006

Incomplete trimorphic incompatibility expression in Oxalis compacta Gill. ex Hook. et Arn. subsp. compacta in the central Chilean Andes
Provedor de dados: 73
Autores: ARROYO,MARY T. K; HUMAÑA,ANA MARÍA; DOMÍNGUEZ,DANIELA; JESPERSEN,GUS.
The expression of trimorphic incompatibility was investigated in a high altitude population of Oxalis compacta subsp. compacta distributed in the upper alpine belt (3100-3470 m) of the central Chile Andes. Stigma-anther reciprocity (2 populations), morph representation (7 populations), unassisted selfing capacity and open-pollination fruit set (6 populations) were determined. O. compacta ssp. compacta es highly dependent on external pollinators. Although it has typical tristylous flowers, considerable seed set is possible following illegitimate intermorph and intramorph cross pollination. Open pollination fruit set varied from 9-83% and on average was lower in the higher-elevation populations. The possibility of seed set following two kinds of illegitimate...
Tipo: Journal article
Palavras-chave: Oxalis compacta subsp. compacta; Trimorphic incompatibility relationships; High alpine; Central Chilean Andes.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100008

TRANSFER OF ACHNANTHES LOOSERI FRENGUELLI TO THE GENUS PLANOTHIDIUM
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola.
Se estudió el material tipo de Achnanthes looseri Frenguelli mediante técnicas de microscopía fotónica y electrónica de barrido. Se propone el traslado de la especie al género Planothidium. Se designa el lectotipo y se entrega una diagnosis corregida del taxón.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100010

THE ROLE OF COTRIC ACID AS A PHOSPHORUS MOBILIZATION MECHANISM IN HIGHLY P-FIXING SOILS
Provedor de dados: 73
Autores: Drouillon,M.; Merckx,R.
Exudation of low molecular weight carboxylates is an important phosphorus (P) acquisition strategy for plants in strongly P-fixing soils. The effect of citrate exudation on P availability was studied in five acid soils with a large organic matter content and a low available P pool. The amount of molybdate reactive P extracted by citric acid 10 mM (0.1-2 mg kg-1) was larger than the molybdate reactive P (MRP) extracted by CaCl2 10-3 M (0.007-0.07 mg kg-1). Both extractants were adjusted to soil pH prior to extraction. Also, the total P content of citric acid extracts (2-44 mg kg-1) far exceeded the total P content of CaCl2 (0.2-1.5 mg kg-1). However, ratios of MRP to total dissolved P (TDP) remained constant. When citric acid was added to the CaCl2-extracts...
Tipo: Journal article
Palavras-chave: Andosols; Citric acid; Phosphorus availability.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100009

HOMENAJE
Provedor de dados: 73
Autores: Eyzaguirre Philippi,María Teresa.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200001

NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE
Provedor de dados: 73
Autores: Staelens,Jeroen; Godoy,Roberto; Oyarzún,Carlos; Thibo,Karen; Verheyen,Kris.
Nitrogen return by leaf litterfall was compared with atmospheric nitrogen deposition for two deciduous Nothofagus stands in southern Chile, located in areas with contrasting land use. The litterfall return of nitrogen in a Nothofagus alpina (Poepp. et Endl.) Oerst. stand at San Pablo de Tregua, in the Cordillera de los Andes, was similar to the litterfall return in a Nothofagus obliqua (Mirb.) Oerst. stand at Paillaco, in the Central Depression. In contrast, the net throughfall and stemflow deposition differed significantly between the two stands. At San Pablo de Tregua, the annual bulk deposition of NH4+ and NO3- was significantly higher than the throughfall and stemflow deposition reaching the forest floor. This demonstrates an uptake of inorganic...
Tipo: Journal article
Palavras-chave: Ammonium; Atmospheric deposition; Canopy interactions; Nitrate; Nutrient cycling; Amonio; Ciclos de nutrientes; Depositación atmosférica; Interacciones del dosel; Nitrato.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200002

La flora exótica ruderal del Parque Nacional La Campana, Región de Valparaíso, Chile central
Provedor de dados: 73
Autores: Hauck,Laura; Moreira-Muñoz,Andrés; Nezadal,Werner.
RESUMEN Los ecosistemas mediterráneos, entre los que se cuenta la zona central de Chile, se consideran globalmente entre los más afectados por las invasiones biológicas. Si bien no todas las especies de plantas exóticas se pueden considerar invasoras, en ellas se encuentra el potencial de invasibilidad que eventualmente puede significar cambios sustanciales en la composición de los ecosistemas y las relaciones entre sus especies. Ello es especialmente crítico en espacios protegidos en los cuales se pretende asegurar la conservación presente y futura de las poblaciones de especies nativas y endémicas. En esta investigación se estudió la presencia de plantas exóticas ruderales en los márgenes de los senderos del Parque Nacional La Campana, con el método de...
Tipo: Journal article
Palavras-chave: Plantas exóticas; Biogeografía de invasiones; Ecosistema mediterráneo; Amenazas a la biodiversidad.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200206

LOBIVIA FEROX BRITTON ET ROSE (CACTACEAE): NUEVO REGISTRO PARA LA FLORA CHILENA
Provedor de dados: 73
Autores: Pinto B.,Raquel.
Se registra por primera vez Lobivia ferox Britton et Rose (Cactaceae) en el altiplano de Tarapacá, norte de Chile, constituyendo una extensión de rango para esta especie. Se detalla la descripción de la especie y aspectos fenológicos y ecológicos
Tipo: Journal article
Palavras-chave: Cactaceae; Lobivia ferox; Nuevo registro; Flora chilena.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000200003

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

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

Relación entre la invasión de Acacia dealbata Link (Fabaceae: Mimosoideae) y la riqueza de especies vegetales en el centro-sur de Chile
Provedor de dados: 73
Autores: Fuentes-Ramírez,Andrés; Pauchard,Aníbal; Marticorena,Alicia; Sánchez,Paulina.
La invasión de árboles puede generar cambios en la composición de las comunidades vegetales y reducciones en el número de especies nativas. Acacia dealbata Link (aromo) fue introducida en Chile con fines ornamentales. Esta especie originaria de Australia y Tasmania, ha sido documentada como invasora en diversos ecosistemas a nivel mundial. En Chile, A. dealbata se asocia fuertemente a caminos, corredores ribereños y perturbaciones antrópicas, comportándose como invasora en ecosistemas naturales y semi-naturales. Sin embargo, sus impactos a nivel comunitario han sido poco estudiados, permaneciendo aun inciertos. Con el objetivo de establecer la relación entre la invasión de A. dealbata y la riqueza y la composición de especies en comunidades naturales del...
Tipo: Journal article
Palavras-chave: Invasiones de plantas; Bosque nativo; Diversidad vegetal; Riqueza de especies.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200004

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

NUEVOS REGISTROS Y ANTECEDENTES DE LA FAMILIA CACTACEAE PARA CHILE EN LA REGION DE AISEN
Provedor de dados: 73
Autores: Saldivia,Patricio; Rojas,Gloria.
Se citan por primera vez como elementos de la flora vascular de Chile a las cactáceas, Maihuenia patagónica (Phil.) Britton &amp;amp; Rose y Pterocactus australis (FA.C.Weber) Backeb. Además se entregan nuevos antecedentes sobre distribución y ecología de otras tres especies de Cactaceae presentes en la Región de Aisén. Todas ellas han sido registradas para Chile exclusivamente para la región, en la ribera sur del lago General Carrera. Se detallan descripciones, distribuciones, flora y vegetación asociada, aspectos ecológicos y se propone una clasificación de sus estados de conservación en Chile.
Tipo: Journal article
Palavras-chave: Cactaceae; Maihueniapatagónica; Pterocactus australis; Nuevos registros; Flora de chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200006

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

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

Estudio florístico del Area Marina Costera Protegida Francisco Coloane, Región de Magallanes, Chile
Provedor de dados: 73
Autores: Domínguez,Erwin; Aravena,Juan Carlos.
Un factor clave para generar políticas de conservación y de manejo de un área protegida es el conocimiento detallado de su biodiversidad. En este trabajo documentamos la flora vascular del Área Marina Costera Protegida Francisco Coloane representada por 55 familias, 92 géneros y 120 especies. De ellas 69 son endémicas para Chile y Argentina. Las familias más diversas son: Asteraceae (11 géneros/15 especies), Poaceae (10 /13) y Cyperaceae (6 /12). Los géneros mejor representados son Carex con 5 especies y Senecio con 4, mientras que 72 géneros están representados por una sola especie. La forma de vida dominante son las hierbas (74 especies, 62%), seguidas de los subarbustos (19 especies, 16%). Dos especies son nuevos registros para la Región de Magallanes...
Tipo: Journal article
Palavras-chave: Flora de Chile; Conservación; Plantas introducidas; Flora vascular.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100017

Polycarpon moreiranum , nueva especie de Caryophyllaceae endémica de Chile
Provedor de dados: 73
Autores: MUÑOZ-SCHICK,MÉLICA; MOREIRA-MUÑOZ,ANDRÉS; DE TRENQUALYE,ALAIN.
ABSTRACT During a scientific prospection to the Guatulame site in the Coquimbo Region, we have found a new species of Polycarpon, here described. This new species is, together with P. coquimbense Gereau y Martic., the second Chilean endemic species of the genus, with a known distribution also restricted to the Andes of Coquimbo Region.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200467

VALIDATION OF SOME RECENT CHILEAN TAXONOMIC NOVELTIES IN ERIOSYCE PHIL. (CACTACEAE)
Provedor de dados: 73
Autores: Watson,John M.
A. E. Hoffmann &amp;amp; H. E. Walter (2004) published taxonomic novelties invalidly in the latest edition of their book on Cactaceae in Chile. It also contained an orthographical inaccuracy. All these occur in the genus Eriosyce as revised and expanded by Katterman (1994). They are rectified here with the colaboration of the original authors. Further observations are added about rare and interesting taxa treated in Hoffmann &amp;amp; Walter
Tipo: Journal article
Palavras-chave: ICBN; IPNI; Monograph; Orthography.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100009

NUEVO REGISTRO DE UNAPOBLACION DE FITZROYA CUPRESSOIDES (MOLINA) I.M. JOHNST. EN SU LIMITE NORTE EN LA ISLA DEL REY, CHILE
Provedor de dados: 73
Autores: Soto,Daniel P.
This short communication describes a small undocumented population oiFitzroya cupressoides (Molina) I.M. Johnst. in the northern limit of the Chilean Coastal Range. The stand is of 1.19 ha in size in 39°53'S, 73°19'0 at 25 m a.s.l. This small isolated stand is inserted in a highly fragmented landscape dominated by exotic tree plantations. This unique condition makes urgent the development of a genetic and biogeographical conservation strategy.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100012

Plantas introducidas en el Parque Nacional Torres del Paine, Chile
Provedor de dados: 73
Autores: Domínguez,Erwin; Elvebakk,Arve; Marticorena,Clodomiro; Pauchard,Aníbal.
Se presentan 61 nuevos registros de plantas introducidas para el Parque Nacional Torres del Paine (49°21'-51°08'S y 73°07'-74°52'O), Región de Magallanes, con una superficie de 181.414 ha. Se encontraron 85 especies introducidas, pertenecientes a 21 familias y 65 géneros. Las familias mejor representadas en número de especies fueron Poaceae (22 spp.), Asteraceae (11 spp.) y Caryophyllaceae (7 spp.). Las hierbas perennes constituyen el 52% y las anuales el 34% de la flora. El 88% de ellas son de origen europeo y el 36% corresponde a especies invasoras
Tipo: Journal article
Palavras-chave: Plantas no indígenas; Plantas invasoras; Reserva de la Biósfera; Parque Nacional Torres del Paine; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000200001

Taxonomía del género Phalaris L. (Poaceae: Pooideae: Phalaridinae) en Chile
Provedor de dados: 73
Autores: FINOT,VÍCTOR L.
Se presenta una revisión taxonómica del género Phalaris L. (Poaceae: Phalaridinae) en Chile. Se reconoce la presencia de 9 especies: P. amethystina Trin., P. caroliniana Walter, P. angusta Nees ex Trin., P. aquatica L., P. arundinacea L., P. canariensis L., P. coerulescens Desf., P. minor Retz. y P. paradoxa L. Se entregan descripciones, sinónimos, ilustraciones, material estudiado y una clave para las especies. Phalaris coerulescens se cita por primera vez para Chile.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200007

Regeneración natural y patrones de distribución espacial de la palma chilena Jubaea chilensis (Molina) Baillon en los bosques mediterráneos de Chile central
Provedor de dados: 73
Autores: MIRANDA,ALEJANDRO; HERNÁNDEZ,H. JAIME; BUSTAMANTE,RAMIRO; DÍAZ,E. MATÍAS; GONZÁLEZ,L. ALBERTO; ALTAMIRANO,ADISON.
Jubaea chilensis es un árbol endémico de la zona central de Chile (31º15&amp;#8217;-35º22&amp;#8217; S). Las principales amenazas actuales a su conservación estarían asociadas a diferentes limitantes a su regeneración natural, en especial la intensa cosecha de sus semillas. El análisis de patrones espaciales de distribución puede ser una importante herramienta para entender la dinámica de los bosques y la interacción entre los individuos. En este trabajo se estudió el patrón espacial de reclutamiento de la especie y se identificaron las condiciones favorables para su regeneración. Se estimó una notoria agrupación espacial entre los individuos de regeneración para todos los rangos de distancia analizados, y a su vez una distribución dependiente de los...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100007

Patterns of composition, richness and phylogenetic diversity of woody plant communities of Quillaja saponaria Molina (Quillajaceae) in the Chilean sclerophyllous forest
Provedor de dados: 73
Autores: Letelier,Luis; Valderrama,Aly; Stoll,Alexandra; García-Gonzáles,Rolando; González-Rodríguez,Antonio.
ABSTRACT Sclerophyllous forest is among the most representative types of woody plant communities in central Chile where Quillaja saponaria is considered to be one of the most important species. In this study, we analysed the main factors that explain the geographical patterns of variation in composition, richness and phylogenetic diversity of woody plant communities in the Chilean sclerophyllous forest where Quillaja saponaria is present. Vegetation surveys were performed for trees and shrubs in thirty-nine sites from 30° to 38° of latitude South in the Mediterranean biome of Chile. Composition, richness, alfa diversity and phylogenetic diversity metrics of the communities were calculated and associated with spatial (latitude, longitude and altitude),...
Tipo: Journal article
Palavras-chave: Diversity; Forest fragmentation; Mediterranean flora; Phylogenetic diversity; Vegetation matrix.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100057

Relaciones filogenéticas de Rhodolirium montanum Phil. y especies afines, basadas en secuencias nucleotídicas de la región ITS y análisis cariotípico
Provedor de dados: 73
Autores: Muñoz,Manuel; Riegel,Ricardo; Seemann,Peter; Peñailillo,Patricio; Schiappacasse,Flavia; Núñez,José.
La taxonomía de los géneros chilenos de Amaryllidaceae es confusa, persistiendo problemas taxonómicos tanto a nivel de géneros como de especies. Actualmente existe controversia acerca de la correcta clasificación de especies hasta ahora asignadas a Rhodophiala C.Presl. A través del estudio de aspectos morfológicos, recientemente se ha sugerido la rehabilitación del género Rhodolirium Phil., donde Rhodolirium montanum Phil. es considerada como especie tipo. Esta especie ha sido denominada Rhodophiala rhodolirion (Baker) Traub en las clasificaciones tradicionales. Dado que los datos morfológicos han provisto información limitada y ambigua en la clasificación de las Amarilidáceas chilenas, este trabajo evalúa la pertinencia de formalizar la rehabilitación del...
Tipo: Journal article
Palavras-chave: Rhodophiala; Rhodolirium montanum; Amaryllidaceae; ITS; Cariotipo.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100005

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

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

Enraizamiento in vitro y ex vitro de microtallos de Ugni molinae Turcz., una especie nativa de Chile
Provedor de dados: 73
Autores: RODRÍGUEZ BERAUD,MARIO; CARRILLO LÓPEZ,RUBÉN; CHACÓN FUENTES,MANUEL; HORMAZÁBAL VÁSQUEZ,NELSON; TAMPE PÉREZ,JOCELYNE; TIGHE NEIRA,RICARDO.
Con el objetivo de evaluar el enraizamiento in vitro y ex vitro de microtallos de dos clones de Ugni molinae, se establecieron dos ensayos. En el experimento de enraizamiento in vitro se contrastaron nueve tratamientos producto de la combinación de tres concentraciones de medio Murashige y Skoog (MS) (1, ½ y ¼ de los macronutrientes diluidos) y tres de ácido 3-indolbutírico (AIB) (0, 1 y 2 µM). En tanto, para el ensayo de enraizamiento ex vitro se contrastaron cuatro tratamientos correspondientes a las concentraciones de 0; 4,9; 9,8 y 19,7 mM de AIB. Después de 30 días se evaluó la supervivencia, enraizamiento, longitud de raíz y número de raíces por explante. El tratamiento que logró el mayor enraizamiento difirió entre ambos clones. En condiciones in...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100002

Una nueva especie del género Bipinnula (Orchidaceae) para Chile
Provedor de dados: 73
Autores: BRAVO-MONASTERIO,PABLO; BAEZA-HORTA,GABRIELA; PEÑAILILLO,PATRICIO; ALARCÓN,DIEGO; CONTRERAS,DOMINGO.
Se describe e ilustra una nueva especie, Bipinnula gabriel (Orchidaceae). Esta nueva especie habita en el tipo de bosque esclerófilo costero de Chile Central, en la localidad de Putú, Constitución, Región del Maule. Discutimos su identidad frente a dos taxones afines (Bipinnula plumosa var. plumosa y Bipinnula plumosa var. philipporum) y las diferenciamos en términos de sus nichos ecológicos. Los resultados señalaron que esta nueva especie posee notables diferencias morfológicas con las especies más próximas, además de diferencias ecológicas que apoyan a esta especie como nueva. Entregamos una descripción de la nueva especie y su hábitat junto a propuestas para su estado de conservación y claves para una determinación adecuada.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100013

Fomitopsis minutispora Rajchenb., a new record of Polyporales for the Chilean mycobiota
Provedor de dados: 73
Autores: SANDOVAL,PABLO; RAJCHENBERG,MARIO.
Se registra Fomitopsis minutispora Rajchenb. (Polyporales, Basidiomycota) por primera vez en Chile. Los basidiomas de la especie fueron hallados sobre troncos caídos, siempre en bosques con presencia del género Nothofagus en la Región de los Ríos. Se presenta una breve descripción, fotografías de la especie y una clave para diferenciar los políporos de basidiomas perennes y pileados más comunes en los bosques de Nothofagus de Chile.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200021

Recovery of Pilgerodendron uviferum (D. Don) Florin forest after antropogenic disturbance in the Valdivian Costal Range, Chile
Provedor de dados: 73
Autores: SZEJNER,PAUL; LE QUESNE,CARLOS; GONZÁLEZ,MAURO E; CHRISTIE,DUNCAN A.
The loss and decline of one ecosystem can be triggered by continuous changes in structure made by frequent and/or severe disturbances. Therefore we quantify the structural losses and the posteriori recovery after man-made disturbances of two fragments of P. uviferum in the Reserva Nacional Valdivia (RNV; 40°S) by studying the evidence of human disturbance and forest structure. Our results indicate frequent burned trees and stumps, indicating that slash and burn are the main factor shaping the present structure of these forest fragments. In both cases 86% of the basal area was represented by dead tress, and 14% of basal area by living individuals. The results show a severe past disturbance and the recovery of those P. uviferum forests by the abundant...
Tipo: Journal article
Palavras-chave: Ciprés de las Guaitecas; Alerce; Deforestation; Natural regeneration; Southern flora; Cordillera de la Costa.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200010

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

The genus Bartramia Hedw. (Bartramiaceae, Bryophyta) in Uruguay
Provedor de dados: 73
Autores: Suárez,Guillermo Martín; Jiménez,María Soledad; Flores,Jorge Rafael.
ABSTRACT El género Bartramia Hedw. se registra por primera vez para Uruguay. Sólo una especie habita la región de estudio (B. laevisphaera) la cual es caracterizada morfológicamente e ilustrada con fotomicrografías ópticas y electrónicas de barrido. Se presenta un mapa de la distribución de la especie en Latinoamérica.
Tipo: Journal article
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100221

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

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

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

Importancia de la vegetación ribereña de Nothofagus dombeyi (Mirb.) Oerst. en el régimen térmico de sistemas fluviales andinos del sur de Chile
Provedor de dados: 73
Autores: PEDREROS,PABLO; GUEVARA-MORA,MEYER; URRUTIA,ROBERTO; STEHR,ALEJANDRA.
A nivel global la temperatura de los ríos sigue siendo tema de investigación en ecología fluvial, pero el conocimiento de su variabilidad espacio-temporal en diversos sistemas fluviales aún es limitada y en algunos casos desconocida. Este estudio tuvo por objetivo comparar el régimen térmico natural de dos ecosistemas fluviales andinos con diferente vegetación ribereña (estepa y bosque de Nothofagus dombeyi). La temperatura en ambos sitios fue registrada con una resolución de 15 min desde enero a julio de 2011. La temperatura media, máxima y rango diario del agua mostraron diferencias significativas, con valores más bajos en el río con presencia de N. dombeyi. En relación al ciclo diario, se observó un leve retraso en la temperatura mínima y adelanto en la...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100005

Nuevos registros de poblaciones de Corynabutilon ochsenii (Phil.) Kearney a una mayor altitud, en formaciones vegetales post incendio en la Reserva Nacional Malleco, Chile
Provedor de dados: 73
Autores: NEIRA,ZOIA; SAAVEDRA,MARCELO; CALZADILLA,SORAYA; HERNÁNDEZ,MARCELO; OBREQUE,CECILIA.
We report new records of Corynabutilon ochsenii (Phil.) Kearney populations in areas affected by forest fires 12 years ago at the Malleco National Forest Reserve in southern Chile. One of the populations is found at 1350 m a.s.l., which is the highest altitude ever reported for this species. C. ochsenii is part of the species that are reestablishing after the fire.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200020

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

El cariotipo de chaetanthera pentacaenoides (Phil.) Hauman (Asteraceae)
Provedor de dados: 73
Autores: Baeza,Carlos M; Torres-Díaz,Cristián.
The karyotype of Chaetanthera pentacaenoides (Phil.) Hauman from Chile was examined. This species belong to the subgenus Egania. The species has 2n = 2x = 20 chromosomes, with 8m + 2sm chromosomes. The reported karyotype is symmetric (AsI % = 58.73)
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000200005

The rediscovery of Frullania weberbaueri Steph.: The first record for Chile, its conservation status, and lectotypification
Provedor de dados: 73
Autores: LARRAÍN,JUAN; VARGAS,REINALDO; URIBE-M.,JAIME; VON KONRAT,MATT.
We report the finding of a population of Frullania weberbaueri in Parque Nacional Pan de Azúcar, Antofagasta Province, Chile. This taxon was previously known only from the type specimen collected by August Weberbauer in Lima in 1901. The new gathering is fertile so we describe here its sexuality and perianths, together with the oil bodies and the habitat used by the species, and we provide a map of its known distribution. A lectotype for the name is here designated. This is the first record of a liverwort for the deserts of northern Chile, and the southernmost record for Frullania sect. Meteoriopsis.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100003

Plantas acuáticas invasoras presentes en Chile: Distribución, rasgos de vida y potencial invasor
Provedor de dados: 73
Autores: Urrutia,Jonathan; Sánchez,Paulina; Pauchard,Aníbal; Hauenstein,Enrique.
RESUMEN Las invasiones biológicas son reconocidas como una de las mayores causas de pérdida de la biodiversidad. Si bien los procesos de invasión se dan tanto en ambientes terrestres como en acuáticos, son los ecosistemas límnicos particularmente sensibles a sus impactos. Dado que la información sobre plantas acuáticas invasoras es escasa en Sudamérica y muy limitada en Chile, el objetivo de este trabajo fue generar información base sobre este grupo de plantas, listando las especies acuáticas invasoras, su distribución, sus rasgos de vida y su potencial invasor (WRA-Ch). Se realizó una revisión exhaustiva en la base de datos Web of Science y otras páginas Web relevantes sobre el comportamiento invasivo de las especies de plantas acuáticas introducidas en...
Tipo: Journal article
Palavras-chave: Comportamiento invasivo; Impactos; Ecosistemas límnicos.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100147

Estructura poblacional de Teline monspessulana (L.) K. Koch en fragmentos de bosque maulino en Chile central
Provedor de dados: 73
Autores: Gómez,Persy; Bustamante,Ramiro; San Martín,José.
In this note we examine the population structure of Teline monspessulana, an exotic plant that is invading fragments of the Maulino Forest. We evaluate density T. monspessulana, sizes, proportion of reproductive individuals and his relation with the size of the patches in 8 forest fragments. Our results indicate a high proportion of individuals growing inside fragments. Moreover, the fragment size is not correlated with T. monspessulana density.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100022

HOMENAJE
Provedor de dados: 73
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100001

REDESCUBRIMIENTO DE UNA ESPECIE DE CALCEOLARIA (CALCEOLARIACEAE)
Provedor de dados: 73
Autores: Muñoz-Schick,Mélica; Moreira-Muñoz,Andrés.
The species Calceolaria reicheana, nomen nudum, was rediscovered in the Metropolitan Region, Chile. It is considered as a valid species, described and renamed as Calceolaria espinosae. A new locality is also recorded.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100011

Lepraria larrainiana (Stereocaulaceae, Lichenized Ascomycetes), a new species from Central Chile
Provedor de dados: 73
Autores: Lendemer,James C.
Lepraria larrainiana se describe como nueva para la ciencia basada en colecciones de una única localidad en la costa de Chile central. La especie crece en dunas de arena estabilizadas y se caracteriza por la alta concentración de los compuestos secundarios strepsilina y ácido lecanórico.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200010

The effect of chilling on seed germination of placea species (Asparagales: Amaryllidaceae), an endemic genus to central Chile
Provedor de dados: 73
Autores: Guerrero,Pablo C; Sandoval,Ana C; León-Lobos,Pedro.
The effect of chilling on germination was examined for six Placea species, a genus in the Amaryllidaceae endemic to the Andes and Coastal Range of central Chile. Based on their natural environment, we hypothesized that low temperatures would be important for germination in theses species. We addressed two questions (i) do Placea seeds require chilling for seed germination? (ii) if they required chilling, does thermal history before chilling affect their responsivity to chilling? At 4ºC seeds of all species germinated faster and to a higher level than at 25ºC. After 28 days, when seeds held at 25ºC were moved to 4ºC, germination increased significantly, however at the end of the assay, their germination was still lower than those seeds initially at 4ºC....
Tipo: Journal article
Palavras-chave: Seed physiology; Dormancy; Biodiversity.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100005

Evaluación de la tolerancia al cobre de dos poblaciones de Oenothera picensis Phil. subsp. picensis (Onagraceae)
Provedor de dados: 73
Autores: GONZÁLEZ,ISABEL; NEAMAN,ALEXANDER.
Oenothera picensis Phil. subsp. picensis puede crecer en suelos contaminados por cobre proveniente de una fundición de metal en Chile central, y presenta características que la hacen candidata para procesos de fitorremediación. Para conocer la tolerancia real y capacidad de extracción de cobre, y si ello ocurre sólo en la población expuesta, se realizaron ensayos hidropónicos utilizando dos poblaciones de O. picensis, provenientes de los sectores Los Maitenes y Maitencillo, áreas con concentraciones altas y normales de Cu en el suelo, respectivamente. Las plantas fueron expuestas a concentraciones de cobre entre 0 y 0,16 mM en la solución, por un período de 1 mes. Las plantas mostraron síntomas de toxicidad a una concentración de 0,04 mM de Cu en la...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200008

FE DE ERRATAS
Provedor de dados: 73
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000200007

VariaciOn morfolOgica de Phacelia secunda J.F. Gmel. (Hydrophyllaceae) a lo largo de un gradiente a ltitudinal en Chile central
Provedor de dados: 73
Autores: Cavieres,Lohengrin A.
Phacelia secunda J.F. Gmel. (Hydrophyllaceae) es una hierba perenne que en Chile, y también en Argentina, presenta una amplia distribución, habitando desde Parinacota (18&amp;deg;S) hasta Tierra del Fuego (54&amp;deg;S), y desde el nivel del mar hasta la alta cordillera. En este estudio se documentan algunas variaciones morfológicas que presenta esta especie a lo largo de un gradiente altitudinal desde los 1.600 m a los 3.400 m en los Andes de Chile central (33&amp;deg;S). Se encontró que el diámetro de las rosetas aumenta significativamente con la altitud, al igual que el número de inflorescencias por individuo y la longitud de la pubescencia. Por el contrario, la altura de las inflorescencias disminuye con la altitud. La tendencia a privilegiar el...
Tipo: Journal article
Palavras-chave: Cambio morfológico; Gradiente altitudinal; Phacelia; Andes.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100007

Schickendantziella trichosepala (Alliaceae), nueva cita para Bolivia
Provedor de dados: 73
Autores: Negritto,María A; Ruiz,Eduardo; Beck,Stephan; Escobar,Inelia; Baeza,Carlos M.
Schickendantziella trichosepala (Speg.) Speg., a new record from Bolivian fora. The taxonomic history, description, iconography and geographical distribution of this monotypic South American genus are presented.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100013

La colección de tipos de plantas vasculares del Herbario Nacional de Chile (SGO): Análisis histórico, temporal y espacial
Provedor de dados: 73
Autores: Muñoz-Schick,Mélica; Morales,Vanezza; Moreira-Muñoz,Andrés.
Se realiza un análisis de la colección de especímenes tipo de plantas vasculares del Herbario Nacional de Chile (SGO) , aportando antecedentes a su historia, a la distribución temporal y espacial de los ejemplares, los colectores y descriptores más importantes junto con la validez de los nombres de los taxones analizados al día de hoy. Se analizaron 6.555 ejemplares, los que fueron recolectados en un período de 182 años (1828-2010). La mayoría de éstos se concentran espacialmente en las regiones de Atacama, Coquimbo y Metropolitana. En cuanto a su validez taxonómica actual, se analizaron 4.236 nombres de taxones, de los cuales el 61% mantienen a lo menos el género y el 20,4% el nombre completo de la especie o categoría infraespecífica con que fue descrito...
Tipo: Journal article
Palavras-chave: Colección tipo; Plantas vasculares; Herbario SGO; Chile.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100012

LEPIDIUM BARNEOUDIANUM SUTORÝ: A NEW NAME FOR THE CHILEAN ENDEMIC SPECIES LEPIDIUM BREVICAULE BARN. (BRASSICACEAE)
Provedor de dados: 73
Autores: Sutorý,Karel.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200010

Primer registro de un posible híbrido homoploide y de un tetraploide en el género Chaetanthera Ruiz &amp;amp; Pav. (Asteraceae) en Chile
Provedor de dados: 73
Autores: BAEZA PERRY,CARLOS; RUIZ,EDUARDO; ESPEJO,JAIME.
En este trabajo se reportan cariotipos detallados de C. elegans Phil., C. x serrata Ruiz &amp;amp; Pav. y C. chilensis (Willd.) DC. Además, se registra por primera vez la presencia de un posible híbrido homoploide entre C. chilensis y C. elegans.y de un tetraploide en Chaetanthera elegans.
Tipo: Journal article
Palavras-chave: Chaetanthera x serrata; Híbrido homoploide; Poliploidía; Chile.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200010

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

MORPHOANATOMY OF NOTHOFAGUS ALESSANDRII SEEDS AND ITS USE IN THE VARIABILITY OF POPULATIONS
Provedor de dados: 73
Autores: Navarro-Cerrillo,Rafael Mª; Santelices,Rómulo; Ruiz Rodríguez,Alberto; Cabello Lechuga,Angel.
Nothofagus alessandrii is an endangered species that is endemic to the Mediterranean area of Chile. There is no information on the anatomical structure of its seeds and there are few studies on the morphometric and germination differences between its populations. Therefore, the purpose of this study was to describe the morpho-anatomical structure of seeds of N. alessandrii in order to compare the morphology and germination four geographically distinct populations. This was done by selecting seeds of four different origins covering the entire latitudinal distribution of the species and measuring their size, shape, dry weight and germination in order to perform a comparative analysis. Results showed that the anatomical structure of N. alessandrii seeds is...
Tipo: Journal article
Palavras-chave: Nothofagaceae; Seed; Ruil; Germination; Anatomy.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100011

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

EL CARIOTIPO DE LAPAGERIA ROSEA RUIZ ET PAV. (LILIALES: PHILESIACEAE)
Provedor de dados: 73
Autores: Jara-Seguel,Pedro; Zúñiga,Cristina A.
Lapageria rosea Ruiz et Pav. showed an asymmetric and bimodal karyotype 2n = 2x = 30, with three metacentric, six submetacentric and six subtelocentric chromosome pairs. One B chromosome pair was also observed. The total chromosome length (2n) was 131.3 + 0.22 µm
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000200007

FLORA DEL MONUMENTO NATURAL EL MORADO: ADDENDA ET CORRIGENDA
Provedor de dados: 73
Autores: Teillier,S.
Este artículo tiene como objetivo mejorar el conocimiento de la flora vascular del Monumento Natural El Morado, ubicado cerca de Santiago en Chile central. El total de especies reportadas se aumenta de 280 a 300, de las cuales 263 son nativas y 37 exóticas
Tipo: Journal article
Palavras-chave: Estepa andina; Flora andina; Matorral andino; SNASPE.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200003

Estudio de la propagación de Myrcianthes coquimbensis (Barnéoud) Landrum et Grifo por semillas y esquejes
Provedor de dados: 73
Autores: SALDÍAS,GABRIELA; VELOZO,JUAN.
Myrcianthes coquimbensis es una especie endémica de Chile en peligro de extinción, con una distribución restringida en la costa de la Región de Coquimbo. En la actualidad su hábitat está siendo fuertemente impactado por desarrollos inmobiliarios. La especie presenta valor ornamental; sin embargo, desde el punto de vista paisajístico es poco conocido. En esta investigación se estudió la propagación por semillas y vegetativa por esquejes, con fines de conservación ex situ. En ensayos de germinación se encontró que la cinética de este proceso varió significativamente según la época de siembra (invierno o verano). Así después de 90 días de siembra se observó un 51% de germinación en verano, mientras en invierno sólo alcanzó el 29%. También se observó un efecto...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100004

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

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

LEPTOCYLINDRUS MINIMUS GRAN (BACILLARIOPHYCEAE): MORFOLOGIA Y DISTRIBUCION EN CHILE
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola; Clement,Alejandro.
Sobre la base de material recolectado en Calbuco, Chiloé, se confirma la presencia en Chile de Leptocylindrus minimus Gran (Bacillariophyceae)
Tipo: Journal article
Palavras-chave: Leptocylindrus minimus Gran; Bacillariophyceae; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100002

The occurrence of phenylpropanoids in the saps of six Piper species (Piperaceae) from Brazil
Provedor de dados: 73
Autores: Paz,Rafaela F.; Guimarães,Elsie F.; Ramos,Clécio S.
RESUMEN Las especies de la familia Piperaceae son ampliamente investigadas debido a su importancia biológica, económica y ecológica. Sin embargo, los estudios químicos con las savias de la familia de las Piperaceae no han recibido tanta atención como la mayoría de otras especies de plantas. El presente estudio demostró la presencia de fenilpropanoides en la savia de seis especies de Piperaceae. Este estudio contribuye significativamente al conocimiento químico de la savia vegetal, hasta el momento poco explorado.
Tipo: Journal article
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100236

Two haplotypes of Capsella bursa-pastoris (Brassicaceae) in Continental Chile support multiple introduction
Provedor de dados: 73
Autores: CASTRO,SERGIO A.; ESPINOSA,CHRISTIAN; FIGUEROA,JAVIER A.
Shepherd&amp;#8217;s purse (Capsella bursa-pastoris; Brassicaceae) is a global weed. In Chile, this species was introduced early during Spanish colonization, however, previous studies based on allozymes and RAPD fragments, show that populations in southernmost Chile could be related to England populations. Here, we analyze the geographical variation of three sequences of cpSSR in 286 individuals of C. bursa-pastoris (ATCP46615, ATCP66701 and ATCP31017). We collected plants from 14 populations distributed over a wide latitudinal gradient in continental Chile. Only one of the markers showed variation (ATCP31017), evidencing the presence of two haplotypes along the territory. The geographic distribution of these haplotypes support previous studies based on...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200004

Viola gelida, a new, rare and vulnerable rosulate species from the high Andes of Atacama Region, Chile
Provedor de dados: 73
Autores: Watson,John M; Cárdenas,María Paz; Flores,Ana R; Macaya,Jorge; Jímenez,Héctor; Barría,Jessica.
Se provee la descripción para Viola gélida, conocida sólo de dos sitios cercanos en el desierto seco y frío de gran altura. Se identifican las características que distinguen su estrecha relación con Viola exsul y otros parientes cercanos. Además, se discute el contexto de su descubrimiento en un estudio de impacto ambiental obligatorio.
Tipo: Journal article
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200016

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

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

Negative photoblastism in the invasive specie Eschscholzia californica Cham. (Papaveraceae): Patterns of altitudinal variation in native and invasive range
Provedor de dados: 73
Autores: Castillo,María L.C; Bustamante,Ramiro O; Peña-Gómez,Francisco T; Gutiérrez,Víctor L; Reyes,Claudio A; Arredondo-Núñez,Alicia; Marey,Marilyn.
Negative photoblastism is defined as the inhibitory effect of light on seed germination. This effect can be modulated by abiotic variables, such as temperature, light condition and water potential. This conditions change notoriously at higher altitudes, could promote differentiations in the photoblastic response among populations. Also, this physiological attribute poses an interesting conflict for plant regeneration, because prevents seed germination on the soil surface, however, it can also to reduce the mortality of seeds germinants in unsuitable conditions and consequently, seedling mortality. Eschscholzia californica is one of the few species with negative photoblastism and it is invasive in Chile, growing primarily in open and disturbed places. Some...
Tipo: Journal article
Palavras-chave: Central Chile; Common garden; California poppies; Seed burial; Seed germination.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200010

Life history variation and demography of the invasive plant Eschscholzia californica Cham. (Papaveraceae), in two altitudinal extremes, Central Chile
Provedor de dados: 73
Autores: Peña-Gómez,Francisco T; Bustamante,Ramiro O.
In this study, we compared demographic responses of Eschscholzia californica populations located at different altitude, under the basic assumption that altitudinal gradients impose environmental limitation to the spread at the upper edge of the gradient. We detected significant differences among populations either in terms of life history attributes and the finite rate of increase. In general, coastal population expressed higher finite population rates than mountain populations, although these differences were not statistically significant. Mountain populations (Corral Quemado and Farellones) expressed a finite population rate not significant different of 1. These result suggest that at the upper front of invasion the species is in a demographic...
Tipo: Journal article
Palavras-chave: Populations; Invasions; Heterogeneity; Demographic matrix.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100011

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

TOTAL AND ORGANIC PHOSPHORUS IN CHILEAN VOLCANIC SOILS
Provedor de dados: 73
Autores: Borie,F.; Rubio,R.
This paper reviews the literature related to total and organic P (Po) levels present in both agricultural and forest soils from southern Chile. Different reports have demonstrated the high contents of total P (Pt) found in agricultural soils (1,000-3,000 mg kg-1) even in unfertilized soils. In most soils Po represents more than 50% of Pt, mainly as inositol penta- and hexaphosphates linked to Fe and/or Al. Lipid-P has been found in very small quantities suggesting very fast cycling. When phosphate fertilizers are applied to these soils, the bulk of P is accumulated as macromolecular-P complexes closely associated with soil organic matter. Close relationships have been found between organic C and Po and between Po and P associated with humic acids (HA-P)....
Tipo: Journal article
Palavras-chave: Agricultural and forest soils; Organic phosphorus; P availability; Total phosphorus; Volcanic soils.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100011

Patrones biogeográficos de los helechos de las Sierras de Córdoba (Argentina) y sus implicancias en la conservación
Provedor de dados: 73
Autores: Arana,Marcelo D; Ponce,Mónica; Morrone,Juan J; Oggero,Antonia J.
Los atlas biogeográficos son la síntesis de patrones de distribución representada por trazos individuales, generalizados, nodos, áreas de endemismo y cladogramas de áreas, y a partir de ellos es posible establecer áreas prioritarias a conservar. Los helechos son indicadores de calidad de los hábitats y su falta de relaciones coevolutivas con vectores bióticos, así como su monofilia y estabilidad morfológica los hacen apropiados para establecer patrones biogeográficos. Nuestro objetivo fue aplicar análisis de trazos y parsimonia de endemismos a la flora de helechos de las Sierras de Córdoba (77 taxones) para contribuir a la elaboración del Atlas Biogeográfico centro-argentino. El patrón distribucional encontrado muestra las estrechas relaciones de estos...
Tipo: Journal article
Palavras-chave: Helechos; Distribución; Chaco serrano; Panbiogeografía; Análisis de parsimonia de endemismos.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200013

Relación entre la amplitud ecológica de epífitas vasculares y sus respuestas ecofisiológicas a la disponibilidad de luz y humedad en el bosque esclerófilo mediterráneo costero de Chile
Provedor de dados: 73
Autores: FERNÁNDEZ,ROCÍO; MORENO-CHACÓN,MARÍA; CANESSA,RAFAELLA; MARDONES,DANIELA; VIVEROS,NATALY; SALDAÑA,ALFREDO.
El microhábitat epífito se encuentra expuesto a grandes variaciones microclimáticas debido al clima local así como a la estructura y dinámica del bosque. Consecuentemente, el establecimiento y desarrollo de las epífitas, así como su amplitud ecológica, dependen de la capacidad de modificar su fisiología, morfología y fenología frente a restricciones ambientales. En este estudio se describen las diferencias en la amplitud ecológica de epífitas vasculares en un gradiente de luz y humedad del sustrato en un relicto de bosque esclerófilo mediterráneo costero que se encuentra en la Península de Hualpén, Región del Biobío (36º47&amp;#8217;S y 73º10&amp;#8217;O). Abarcando la variación horizontal y vertical en la disponibilidad de luz y humedad del sustrato...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100009

Las orquídeas de la Reserva de la Biosfera Torres del Paine: La necesidad de implementar monitoreo de especies y planificación ecoturística para la conservación de la biodiversidad
Provedor de dados: 73
Autores: Vidal,Osvaldo J; San Martín,Cristina; Mardones,Sofía; Bauk,Viviana; Vidal,Claudio F.
Se describen las orquídeas de la Reserva de la Biosfera Torres del Paine sobre la base de exploraciones botánicas, registros fotográficos y colecciones de herbario llevadas a cabo por los autores. Esta lista comprende 3 géneros y 9 especies: Chloraea chica, Chloraea leptopetala, Chloraea magellanica, Codonorchis lessonii, Gavilea araucana, Gavilea gladysiae, Gavilea littoralis, Gavilea lutea y Gavilea supralabellata. G. gladysiae es un registro nuevo para esta área protegida y se reporta el primer fenotipo aberrante de flores albinas de Chl. magellanica. Se provee de una descripción de las especies que incluye morfología, habitats, abundancias locales, fenología de floración y fotografías. La riqueza de especies aquí reportada representa cerca del 35% de...
Tipo: Journal article
Palavras-chave: Chloraea; Codonorchis; Gavilea; Áreas protegidas; Flora patagónica; Especies emblemáticas.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100013

Phalaris paradoxa L. (Poaceae: Phalaridinae), a new introduced weed species in Central Chile
Provedor de dados: 73
Autores: Finot,Víctor L; Alberto Pedreros,J.
Se da a conocer la presencia de Phalaris paradoxa L. (Poaceae), nueva especie para la flora advena de Chile, recolectada como maleza de cultivos agrícolas en la Región del Libertador Bernardo O'Higgins, 34°39'S, 71°23'W. Se incluye una clave para determinar las especies de Phalaris que crecen en Chile.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100021

SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES
Provedor de dados: 73
Autores: Lusk,Christopher H.; Matus,Francisco; Moreno-Chacón,María; Saldaña,Alfredo; Jiménez-Castillo,Mylthon.
Resorption of nutrients from senescing tissues is an important aspect of the nutrient economy of perennial plants, and a major influence on ecosystem nutrient dynamics. Attempts to interpret the adaptive significance of variation in nutrient resorption efficiency have met with little success, leading some scientists to emphasize the need for more work on the biochemical and physiological basis of resorption. One hypothesis suggests than variation in resorption is controlled by sink-source effects within the plant. According to this hypothesis, we might expect resorption to be positively correlated with plant growth rates. This could be expected not only for comparisons among species or populations, but also when comparing conspecific individuals growing at...
Tipo: Journal article
Palavras-chave: Nitrogen; Nutrient cycling; Phosphorus; Plant nutrition; Resorption.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100006

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

LOS HELECHOS MEDICINALES DE CHILE Y SUS NOMBRES VULGARES
Provedor de dados: 73
Autores: Looser,Gualterio; Rodríguez,Roberto.
Se presenta un manuscrito inédito del naturalista Gualterio Looser (1886-1982), sobre los helechos medicinales de Chile y sus nombres vulgares. Se agregan nombres científicos actuales, se detallan las citas bibliográficas y se actualiza la ortografía. El documento original se encuentra archivado en la biblioteca del Departamento de Botánica, Universidad de Concepción.
Tipo: Journal article
Palavras-chave: Etnobotánica.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000100001

FLORA Y VEGETACION DEL SALAR DE ASCOTAN, ANDES DEL NORTE DE CHILE
Provedor de dados: 73
Autores: Teillier,Sebastián; Becerra,Pablo.
En este trabajo se caracterizan la flora y la vegetación del salar de Ascotán, ubicado en los Andes de la Región de Antofagasta (II), Chile. La flora del salar, compuesta por 21 especies, es completamente diferente de la flora aledaña a él. También difieren los espectros de formas de vida del salar, dominado por hemicriptófitas (hierbas perennes), con la vegetación que lo rodea, dominada por nanofanerófitas (arbustos). En el salar se encontraron dos unidades de vegetación diferenciadas a partir por la composición de especies. Ambas unidades difieren, tanto en su flora como en sus espectros biológicos. Una unidad está dominada por hemicriptófitas y caméfitas, mientras que en la otra dominan exclusivamente las hemicriptófitas; las caméfitas y las geófitas...
Tipo: Journal article
Palavras-chave: Análisis de conglomerados; Fitosociología; Formas de vida; Halófitas; Humedales andinos.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200006

PLANTAS VASCULARES DE LOS RIOS BAKER Y PASCUA, REGION DE AISEN, CHILE
Provedor de dados: 73
Autores: Rodriguez,Roberto; Marticorena,Alicia; Teneb,Ernesto.
Se reportan los resultados de las excursiones botánicas realizadas durante los años 2006- 07 a las cuencas de los ríos Baker y Pascua en la Región de Aisén, Patagonia chilena. Se encontraron 342 taxa de plantas vasculares, 302 en la cuenca del río Baker y 124 en río Pascua. Las familias mejor representadas son Poaceae (52), Asteraceae (50) y Cyperaceae (15). Cuatro especies endémicas de Chile fueron encontradas en la cuenca del río Baker.
Tipo: Journal article
Palavras-chave: Flora de Chile; Patagonia chilena; Conservación; Plantas invasoras.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100006

Presencia de la familia Hymenophyllaceae (Pteridophyta) en el Parque Katalapi, Cordillera de Quillaipe, Provincia de Llanquihue, Chile
Provedor de dados: 73
Autores: PARRA,MARIA JOSÉ; ACUÑA,KARINA; CORCUERA,LUIS; RODRÍGUEZ,ROBERTO.
Three Hymenophyllaceae genera were found in Katalapi Park, Region de Los Lagos, Chile: Hymenoglossum, Serpyllopsis, and Hymenophyllum. While the first two genera are monotypic, the third one is represented by 16 species. In this study, we propose that the Hymenophyllum species that were not found in the area are doubtful for Chile due to the inconsistency of their diagnostic characters. From the conservation point of view of this group, six of the species in the park are classified as vulnerable. Finally, and based on vegetative characters, an identification key for Hymenophyllum genera is given.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200018

PATRONES DE DISTRIBUCIÓN DE PLANTAS INTRODUCIDAS EN ÁREAS SILVESTRES PROTEGIDAS Y SUS ÁREAS ADYACENTES DEL CENTRO-SUR DE CHILE
Provedor de dados: 73
Autores: Jiménez,Alejandra; Pauchard,Aníbal; Marticorena,Alicia; Bustamante,Ramiro O.
Las áreas silvestres protegidas (ASP) ubicadas en la zona centro-sur de Chile (Región Metropolitana - Región de la Araucanía) conforman un relicto de conservación inserto en la matriz agronómica y silvicultural de esta zona. Comparamos la diversidad taxonómica de especies nativas e introducidas de nueve sitios en ASP y su matriz adyacente, en orillas de camino y hábitats de interior. Encontramos 353 especies nativas y 120 introducidas. La mayor diversidad de introducidas se concentra en la matriz adyacente a las ASP y en las orillas de caminos. Las especies nativas no presentan diferencias en riqueza entre la matriz y las ASP. Especies introducidas y nativas se agrupan de acuerdo al gradiente climático. La mayor riqueza y abundancia de especies...
Tipo: Journal article
Palavras-chave: Áreas naturales; Gradiente climático; Introducidas; Perturbación; Taxonomía.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100012

REVISIÓN DEL GÉNERO GAULTHERIA L. (ERICACEAE) EN CHILE
Provedor de dados: 73
Autores: Teillier,Sebastián; Escobar,Felipe.
Se realizó una revisión del género Gaultheria L. (Ericaceae) presente en Chile, utilizando los métodos clásicos. Se tuvieron a la vista los tipos y las colecciones de los herbarios SGO y CONC, además de los sitios WEB de instituciones que contienen fotos de tipos o isotipos. Se concluyó que Gaultheria es un género que en Chile presenta varias complejidades: una centena de nombres propuestos por los científicos botánicos de todos los tiempos, taxa complejos con amplísima variación en la morfología foliar como G. mucronata, G. poeppigii y G. racemulosa, taxa intermedios entre especies (posibles híbridos) y taxa indistinguibles en ausencia de frutos (G. phyllireifolia-G. mucronata). Como conclusión de la revisión se aceptan para Chile 12 especies y una...
Tipo: Journal article
Palavras-chave: Gaultheria; Ericaceae; Flora de Chile.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100014

Primer registro de Russula pectinatoides Peck (Basidiomycota, Russulaceae) para Chile
Provedor de dados: 73
Autores: PALFNER,GÖTZ.
Russulapectinatoides (Basidiomycota, Russulaceae), considered a holarctic species, is reported for the first time from Chile. It adds to the list of adventitious Russula and Lactarius species which form mycorrhizal associations with introduced ornamental and forest trees. A detailed description and an updated key for allochtonous agaricoid Russulaceae in Chile are provided.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200025

NUEVOS REGISTROS DEL GENERO TRISETUM PERS. (POACEAE : AVENEAE) PARA LA FLORA DE CHILE
Provedor de dados: 73
Autores: Finot,Víctor L.
Se da a conocer la presencia de tres nuevos taxa del género Trisetum Pers. (Poaceae : Aveneae) para la flora de Chile, considerados hasta ahora endémicos de Argentina: T. ambiguum Rúgolo et Nicora, T. caudulatum Trin. var. correae Nicora y T. oreophilum Louis-Marie var. johnstonii Louis-Marie. Se incluye una descripción de cada taxón y un mapa de su distribución en Chile
Tipo: Journal article
Palavras-chave: Trisetum; Poaceae; Nuevos Registros; Flora de Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100001

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

Raíces adventicias de Saxegothaea conspicua Lindl. (Podocarpaceae) en su etapa de senescencia en bosques adultos
Provedor de dados: 73
Autores: CANO,MAURICIO J.; GODOY,ROBERTO; SOTO,DANIEL P.
We studied the anatomy of the adventitious structures that Saxegothaea conspicua Lindl. develops inside of the stem during its senescence stages in old-growth temperate forest; by scanning electronic microscopy, we evaluated the hypothesis whether those structures correspond to adventitious roots. The results confirm that the anatomical structures are similar to a common roots system at first development stages. We discuss the possible functional implications of these adventitious roots in extend the life of the individuals in forests.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100018

Nuclear DNA content in Chilean species of Phycella and Rhodolirium (Amaryllidaceae)
Provedor de dados: 73
Autores: Palma-Rojas,Claudio; Jara-Seguel,Pedro; von Brand,Elisabeth.
RESUMEN Las determinaciones de ADN nuclear realizadas muestran que el valor 2C para Rhodolirium montanum Phil. (2n=2x=16) es de 17,39 pg y de 15,16 pg para Phycella ignea (Lindl.) Lindl. (2n=2x=16). Sin embargo, el tetraploide Phycella scarlatina Ravenna (2n = 4x = 32) tiene un valor de ADN 2C de 30,63 pg , el cual es concordante con su nivel de ploidía.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100018

Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of Chile
Provedor de dados: 73
Autores: ROJAS,ISABEL; BECERRA,PABLO; GÁLVEZ,NICOLÁS; LAKER,JERRY; BONACIC,CRISTIÁN; HESTER,ALISON.
Human impact such as forest fragmentation and degradation may have strong effects on native and exotic plant communities. In addition, these human-caused disturbances occur mostly in lowlands producing greater fragmentation and degradation there than in higher elevations. Plant invasion should be greater in more fragmented and degraded forests and hence lowlands should be more invaded than higher elevations. In turn, native species richness should be negatively related to fragmentation and degradation and hence greater in higher elevations within a forest type or elevation belt. We assessed these hypotheses in an Andean temperate forest of southern Chile, Araucanía Region. We recorded the vascular plant composition in twelve fragments of different size,...
Tipo: Journal article
Palavras-chave: Fragmentation; Forest degradation; Elevation gradient; Invasion; Plant diversity.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200006

NOMENCLATURAL CHANGES IN NOLANA (NOLANEAE, SOLANACEAE)
Provedor de dados: 73
Autores: Dillon,Michael O.
Una reciente revisión del material tipo que se encuentra depositado en el Museo Nacional de Historia Natural (SGO) ha requerido la transferencia de Alona patula Phil, a Nolana [N. patula (Phil.) Mesa ex M.O.DiUon], y una re-evaluación en el concepto de las especies. Nolana flaccida (Phil.) I.M.Johnst. se coloca como sinónimo de N. sphaerophylla (Phil.) Mesa ex M.O.DiUon, y el taxón previamente reconocido como N. flaccida es denominado aquí N. patula. Se proporciona además una nueva combinación junto con un análisis de los conceptos de taxonomía de las especies implicadas.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200017

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

NUEVO HALLAZGO DE TARASA UMBELLATA KRAPOV. (MALVACEAE)
Provedor de dados: 73
Autores: Marticorena,Alicia; Valdivieso,José Antonio; Baeza,Carlos M.
Se presenta el nuevo hallazgo de Tarasa umbellata Krapov. (Malvaceae) en Talca, Chile. Los frutos eran desconocidos hasta ahora. Se entrega una descripción completa, comentarios de su hábitat, número cromosómico y la relación con Tarasa reichei (Phil.) Krapov
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200006

WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST
Provedor de dados: 73
Autores: Lusk,Christopher H.
Bamboos of the genus Chusquea are aggressive colonisers of tree-fall gaps in the temperate rain forests of southern Chile. Chusquea thickets inhibit regeneration of tree species, suggesting that light levels beneath bamboo-filled gaps may be lower than beneath tall forest. Two LAI-2000 canopy analysers were used to compare diffuse light availability beneath five Chusquea quila thickets and five neighbouring tall forest stands, in a low altitude (&lt;FONT FACE=Symbol&gt;È&lt;/FONT&gt; 400 m a.s.l.) old-growth temperate rain forest in Parque Nacional Puyehue (40º39'S). Leaf area indices (LAI) of these two vegetation phases are also compared. Average diffuse light levels beneath bamboo thickets (1.5 %) were only slightly lower than those beneath tall forest...
Tipo: Journal article
Palavras-chave: Chusquea; Diffuse light; Forest dynamics; LAI-2000; Positive feedback vegetation switch.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100003

Estudio de la relación polen-vegetación actual en el Norte de Chile, en el transecto Pozo Almonte-Salar de Huasco (20º15&amp;#8217;S/69º06&amp;#8217;O)
Provedor de dados: 73
Autores: COLLAO-ALVARADO,KATHY; MALDONADO,ANTONIO; GONZÁLEZ,LETICIA; SANDOVAL,ANA; DE PORRAS,MARÍA EUGENIA; ZAMORA,ANDRÉS; ARANCIO,GINA.
La diversidad vegetal de la zona andina del Norte Grande de Chile ha sido estudiada desde diversos puntos de vista (florísticos, fisonómicos, etnobotánicos, conservacionistas, etc.); sin embargo, hasta ahora no se ha estudiado desde un punto de vista palinológico. Así, este trabajo tiene como objetivo aportar al conocimiento de la vegetación y su señal polínica en los distintos pisos altitudinales del Norte Grande de Chile, aportando además a la identificación de los principales tipos polínicos presentes. Este estudio presenta la relación entre lluvia de polen y vegetación actual en un transecto altitudinal entre Pozo Almonte y el Salar de Huasco, en el norte de Chile, junto con fotografías y descripciones de 12 morfotipos polínicos representativos de la...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100015

Experiencia de conservación ex-situ de Solanum fernandezianum &amp;#40;Solanaceae&amp;#41;
Provedor de dados: 73
Autores: Solano,Jaime; Anabalón,Leonardo; Hauenstein,Enrique.
Solanum fernandezianum is an endemic species in danger of extinction the Robinson Crusoe Island, Chile. The fruit was collected during March and April of 2002. The seeds were storaged for a year to 4°C. The percentage of germination in laboratory conditions was 14.3%. After 22 weeks plants initiated flowering and fruiting. The conservation strategy considered germination of seeds, production of plants in incubation chamber, transplantation to pots and pots arranged in a greenhouse.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100011

RELACION ENTRE EL ORIGEN FLORAL Y EL PERFIL DE ELEMENTOS MINERALES EN MIELES CHILENAS
Provedor de dados: 73
Autores: Montenegro,Gloria; Fredes,Carolina.
In this report, 61 honey samples were collected in beehives located between IV and X Administrative Region of Chile. We focussed the analysis in risky chemical elements for human health and in the main chemical elements found previously in Chilean honeys. The analysis of Al, Sr, Cu, Fe, Mn and Zn were done by wet acid digestion method by ICP-OES. Lotus pedunculatus and Eucryphia cordifolia honeys showed the highest Al contents related to their geographical origin (Bío-Bío and Los Lagos Regions). The principal component analysis did not show groups of honeys with the some floral origin and a typical chemical element profile.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100014

First records of Eocr Onartium muscicola (Basidiomycota, Eocronartiaceae) in Chile on two new hosts
Provedor de dados: 73
Autores: Sandoval,Pablo; Henríquez,José L; Faúndez,Luis; Larraín,Juan.
The heterobasidiomycete fungus Eocronartium muscicola is an obligate parasite recorded on about 21 moss species, mainly from the Northern Hemisphere. It interacts with its hosts mainly by replacing the sporophyte and obtaining water and nutrients from the gametophyte through specialized tissues. This work reports for the first time E. muscicola on the native mosses Eurhynchium corralense and Eurhynchiella acanthophylla in central and southern Chile, in different forest formations. Also, associations between fungi and bryophytes as well as the taxonomic status of Chilean host mosses and its relationship with E. muscicola are discussed.
Tipo: Journal article
Palavras-chave: Pucciniomycetes; Eurhynchiella acanthophylla; Eurhynchium corralense; Moss parasite; Chilean Mycobiota.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100009

Taxonomic revision of the genus Gamochaeta Wedd. (Gnaphalieae, Asteraceae) in Chile
Provedor de dados: 73
Autores: Freire,Susana E.; Salomón,Luciana; Bayón,Néstor D.; Baeza,Carlos M.; Muñoz-Schick,Mélica; Migoya,María A.
ABSTRACT Twenty four species of Gamochaeta (Gnaphalieae, Asteraceae), G. aliena, G. alpina, G. americana, G. andina, G. axillaris, G. chamissonis, G. depilata, G. deserticola, G. falcata, G. filaginea, G. humilis, G. longipedicellata, G. neuquensis, G. nivalis, G. oligantha, G. procumbens, G. ramosa, G. serpyllifolia, G. simplicicaulis, G. spiciformis, G. stachydifolia, G. subfalcata, G. valparadisea, and G. villarroelii, are formally monographed with morphological descriptions, illustrations, geographic distribution and habitat, distribution maps, phenology, lists of representative specimens examined, and a comprehensive identification key for every species. A new name Gamochaeta ramosa S.E. Freire, N. Bayón &amp; C.M. Baeza for Gnaphalium ramosum Phil....
Tipo: Journal article
Palavras-chave: Compositae; Endemism; Lectotypification; South America; Synonyms; Taxonomy.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200292

THALASSIOTHRIX SPATHULATA HASLE (THALASSIONEMATACEAE, BACILLARIOPHYCEAE): PRIMER REGISTRO PARA LA FLORA DIATOMOLOGICA MARINA DE CHILE
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola.
We report the first finding of Thalassiothrix spathulata in the marine phytoplankton of Chile. The species was common in samples collected between 18º16'S and 28º06'S. Principal morphological features are described and illustrated
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100009

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

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

Lichens of the surrounding areas of Termas of Chillán and Las Trancas, Bío-Bío Region, Chile
Provedor de dados: 73
Autores: PEREIRA,IRIS; WANG,XIN YU; OH,SOON-OK; SÁNCHEZ,PEDRO; HUR,JAE-SEOUN.
The aim of this study was to contribute to the knowledge of the richness and distribution of the lichens in the Bío-Bío Region. A total of 120 samples were collected in the surroundings of Termas de Chillán and Las Trancas, Bio-Bio region. The sampling was realized at random considering the high diversity of available substrates. Taxonomical identification was performed on the basis of the analysis of morphological, reproductive and chromatographic (TLC) characters. A total of 41 species were identified, which include 18 families and 31 genera. Out of the total of identified species, 49 % are corticolous, 34 % saxicolous and 17 % terricolous. Of the total of species found, four are new records for Chile: Menegazzia confusa P. James, M. pertransita (Stirt.)...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100012

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

NUEVOS REGISTROS PARA LA FLORA DE CHILE: MAGALLANA PORIFOLIA CAV. (TROPAEOLACEAE), TRISTAGMA AMEGHINOI (SPEG.) SPEG. Y TRISTAGMA PATAGONICUM (BAKER) TRAUB (ALLIACEAE)
Provedor de dados: 73
Autores: Faúndez Y.,Luis; Macaya B.,Jorge H.
Magallana porifolia Cav., Tristagma ameghinoi (Speg.) Speg. and Tristagma patagonicum (Baker) Traub, are reported for first time for the chilean flora, growing in the Region of Aysen (Region XI). The species are described and comments about their habitats are made
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100008

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

Eventos tempranos en el proceso de infección de Macrophomina phaseolina (Tassi) Goid. en raíces de plántulas de Pinus radiat a D. Don y sus efectos en la eficiencia fotosintética como indicador de estrés biótico
Provedor de dados: 73
Autores: Garrido Bigotes,Adrián; Espinoza Galindo,Giannina Isabella; Sáez Delgado,Patricia; Cañal Villanueva,María Jesús; Sanfuente Von Stowaser,Eugenio; Hasbún Zaror,Rodrigo.
RESUMEN Los eventos tempranos que ocurren luego de inocular raíces de plántulas de Pinus radiata con el hongo patógeno Macrophomina phaseolina son desconocidos. Los objetivos de este estudio fueron conocer el proceso de germinación de los microesclerocios y la penetración de las hifas de M. phaseolina en raíces de plántulas de P. radiata, y establecer posibles efectos en la eficiencia fotosintética durante las primeras horas de la infección del patógeno. Para ello se inocularon raíces de plántulas de 25 días de edad con microesclerocios de M. phaseolina bajo condiciones in vitro. Las primeras horas del ciclo de enfermedad, seguido a la inoculación de las raíces, fueron estudiadas mediante microscopía electrónica de barrido y la eficiencia del fotosistema...
Tipo: Journal article
Palavras-chave: Pudrición carbonosa; Enfermedades de viveros; Patógenos forestales; Germinación de microesclerocios; Eficiencia máxima del FSII.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200430

Propagación vegetativa por esquejes de Monttea chilensis Gay
Provedor de dados: 73
Autores: SALDÍAS,GABRIELA.
Monttea chilensis (Plantaginaceae) es un arbusto endémico de zonas áridas y semiáridas de Chile, clasificado En Peligro de Extinción. Con la finalidad de aportar a la conservación ex situ de esta especie se realizaron ensayos de propagación por esquejes. Se utilizaron esquejes binodales, aplicando ácido indol butírico (AIB), en concentraciones de 0, 1500, 3000, 5000 y 7500 ppm, utilizando 60 esquejes por tratamiento. Se mantuvieron en cama caliente (22 ºC) y humedad 80% regulado con la activación de nebulizadores, bajo túnel plástico. La aplicación de AIB no incrementó el enraizamiento, siendo similar la respuesta del testigo a la dosis de 1500 ppm de AIB, alcanzando un 40% de enraizamiento. Dosis hormonales superiores e inferiores a 1500 ppm tuvieron un...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100004

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

Notes on the floral biology and pollination syndrome of Echinopsis chiloensis (Colla) Friedrich &amp;amp; G.D.Rowley (Cactaceae) in a population of semiarid Chile
Provedor de dados: 73
Autores: OSSA,CARMEN G; MEDEL,RODRIGO.
We report some aspects of the floral biology ofEchinopsis chiloensis ssp. chiloensis in a population near to the northern limit of its distribution. Anthesis is strictly diurnal and flowers remain open during 492 min on the average. Echinopsis chiloensis is self-incompatible. Flower longevity, nectar production along day, and floral visitors indicate that this population fits well to a diurnal insect pollination syndrome. These results contrast with a previous report indicating nocturnal anthesis and mixed mellitophylous-sphingophylous pollination syndrome in populations near to the southern limit of the distribution range. We suggest that the pollination syndrome of E. chiloensis is a labile rather than fixed condition that may depend on the abiotic...
Tipo: Journal article
Palavras-chave: Flower longevity; Nectar production; Pollination syndrome; Flower adaptation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200012

Evidencia de ADN ribosomal y del cloroplasto para la diversificaciOn de las PortulacAceas de AmErica occidental en la regiOn andina
Provedor de dados: 73
Autores: Hershkovitz,Mark A.
Se determinaron las secuencias del espaciador interno (ITS) del ADN ribosomal y del espaciador intergénico de ycf3-trnS del ADN del cloroplasto para 183 muestras de taxas, chilenos y no chilenos, de Portulacaceae de América occidental, y sus grupos externos. Los datos permiten refinar previas inferencias sobre la circunscripción e interrelaciones de los géneros estudiados. En particular estos datos revelan que una circunscripción anteriormente publicada de Cistanthe Spach es polifilética y también revelan la existencia de un clado norteamericano compuesto por Claytonia L., Lewisia Pursh, Lewisiopsis R. Govaerts, and Montia L. De los datos de los géneros sudamericanos surgieron dos patrones: (1) en algunos casos la divergencia interespecífica es...
Tipo: Journal article
Palavras-chave: Portulacaceae; Chile; ITS; Ycf3-trnS; Hibridización.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100002

Estudio preliminar de la flora liquénica de Isla Mocha, sur de Chile
Provedor de dados: 73
Autores: Quilhot,Wanda; Cuellar,Mauricio; Díaz,Rodrigo; Riquelme,Francisco; Rubio,Cecilia.
La micobiota liquenizada de Isla Mocha, sur de Chile, está representada por 76 especies en 30 géneros; el 38 % de las especies son endémicas del sur de Sudamérica. Xanthoria parietina, registrada en todas las zonas de muestreo, y Pseudocyphellaria malmeana recolectada sólo en el bosque de Aextoxicon punctatum, son las especies más representativas. Ramalina fastigiata constituye un nuevo registro para Chile.
Tipo: Journal article
Palavras-chave: Líquenes; Distribución; Endemismo; Aextoxicon punctatum.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200006

NITROGEN FLUXES IN A NOTHOFAGUS OBLIQUA FOREST AND A PINUS RADIATA PLANTATION IN THE CENTRAL VALLEY OF SOUTHERN CHILE
Provedor de dados: 73
Autores: Oyarzún,Carlos; Godoy,Roberto; Staelens,Jeroen; Aracena,Claudia; Proschle,Juan.
Forest structure and tree species can have a significant impact on total atmospheric nitrogen (N) deposition; for example, deciduous forests have higher N requirements than coniferous forests. However, knowledge about the effect of the conversion of native Chilean vegetation cover by exotic plantations on N cycling is scarce. The aim of this study was to determine the effect of the replacement of a Nothofagus obliqua native forest by a Pinus radiata plantation in southern Chile on the chemistry of throughfall, stemflow, soil water infiltration and percolation. Pinus radiata stemflow was more acidic (pH 4.7) than precipitation (pH 5.2) and throughfall (pH 5.6), while in the Nothofagus forest stemflow and throughfall pH were 6.3 and 6.1, respectively. In the...
Tipo: Journal article
Palavras-chave: Ammonium; Infiltration; Nitrate; Soil percolation; Throughfall.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200004

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

Pollen morphology of Cactaceae in Northern Chile
Provedor de dados: 73
Autores: MIESEN,FLOREANA; DE PORRAS,MARÍA EUGENIA; MALDONADO,ANTONIO.
Chile is habitat to over 140 species of cactus of which 45% are endemic and most of them grow in the arid northernmost part of the country between 18°-32°S. As the Cactaceae family plants are quite well adapted to arid environments, their fossil pollen may serve as a tool to reconstruct past environmental dynamics as well as to trace some issues regarding the family evolution or even some autoecological aspects. Aiming to create a reference atlas to be applied to some of these purposes, the pollen morphology of the following 14 different species of the Cactaceae family from Northern Chile was studied under optical microscopy: Cumulopuntia sphaerica, Maihueniopsis camachoi, Tunilla soehrensii, Echinopsis atacamensis, Echinopsis coquimbana, Haageocereus...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200010

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

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

Utilizando la metodología fitosociológica para diferenciar hábitats: un ejemplo con especies chilenas de Schinus (Anacardiaceae) en la Región de Aisén, Chile
Provedor de dados: 73
Autores: RAMÍREZ,CARLOS; SANDOVAL,VÍCTOR; CISTERNAS,JUAN CARLOS; RIVERA,HUGO; VIDAL,OSVALDO; SAN MARTÍN,CRISTINA; ÁLVAREZ,MIGUEL; PÉREZ,YÉSSICA.
Se estudiaron los hábitats de Schinus patagonicus y Schinus marchandii en la Patagonia chilena, con el propósito de determinar las comunidades vegetales en que crecen y el carácter primario o secundario de ellas, para ayudar a establecer el estado de conservación de las dos especies. Se trabajó con metodología fitosociológica para caracterizar florística y vegetacionalmente las comunidades. La tabla de vegetación se ordenó con métodos tradicionales, utilizando especies diferenciales y estadísticos multivariables de clasificación y ordenación. La tabla fitosociológica inicial presentó 68 especies vegetales siendo 26 de ellas malezas introducidas. En el espectro biológico predominaron hemicriptófitos y con menor importancia, fanerófitos y terófitos. La...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200015

TRES NUEVAS MONOCOTILEDONEAS DESCUBIERTAS EN CHILE: ALSTROEMERIA MOLLENSIS M. MUÑOZ ET A. BRINCK (ALSTROEMERIACEAE), MIERSIA CHILENSIS VAR. BICOLOR M. MUÑOZ (GILLIESIACEAE) Y CALYDOREA CHILENSIS M. MUÑOZ (IRIDACEAE)
Provedor de dados: 73
Autores: Muñoz-Schick,Mélica.
Se describen tres entidades nuevas de monocotiledóneas descubiertas en Chile: Alstroemeria mollensis, Miersia chilensis var. bicolor y Calydorea chilensis. Se presentan descripciones, distribución geográfica, fotos y dibujos
Tipo: Journal article
Palavras-chave: Especies y variedad nuevas; Flora de Chile; Liliopsida.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200004

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

FENOLES SOLUBLES TOTALES Y SU RELACION CON LA INHIBICION DE LA RIZOGENESIS EN ESTACAS DE NOTHOFAGUS PUMILIO (POEPP. ET ENDL.) KRASSER
Provedor de dados: 73
Autores: Latsague V.,Mirtha; Lara G.,Janina.
Los compuestos fenólicos en concentraciones altas participan como inductores de la oxidación de auxinas, interfiriendo con la formación de raíces adventicias en estacas de tallo. Al no obtener enraizamiento en estacas de lenga (Nothofagus pumilio (Poepp. et Endl.) Krasser) en invierno y verano, se atribuyó que esto se debía a una alta cantidad de fenoles producidos en lenga, comparado con otros Nothofagus. En este estudio se procedió a cuantificar el contenido de fenoles solubles totales en estacas de lenga a través del método analítico Folin-Dennis, y comparar con el contenido de fenoles solubles totales en raulí (Nothofagus alpina (Poepp. et Endl.) Oerst.), especie que sí forma raíces adventicias. El contenido de fenoles solubles obtenidos en N. pumilio...
Tipo: Journal article
Palavras-chave: Compuestos fenólicos; Nothofagus pumilio; Rizogénesis.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200002

Un inusual bloom de Tetraselmis sp. en la Bahía de Valparaíso, Chile
Provedor de dados: 73
Autores: PIZARRO,MARLENE; ITURRIAGA,RODOLFO; SILVA,ALEJANDRO; GALLEGOS,SONIA.
A bloom of Tetraselmis sp. was observed during the first days of January of 2006 in the Valparaiso Bay (32° 57'S; 71° 33'W), producing green coloration of sea and exclusion of phytoplankton species. Previous blooms of Tetraselmis sp. have not been observed in this bay.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200014

NEW ALGAE RECORDS (CHLOROPHYCEAE AND BACILLARIOPHYCEAE CLASSES) FROM SIX PAMPEAN LOTIC SYSTEMS OF ARGENTINA
Provedor de dados: 73
Autores: Mercado,Liliana M.
Nineteen new record species for Argentina belonged to Bacillariophyceae and Chlorophyceae Classes were identified as the result of the analysis of a total of 103 phytoplankton samples obtained from a 5-year study survey performed in 6 lotic systems from Buenos Aires province, tributaries of Río de la Plata river: Paraná de las Palmas river (1995-1996), Samborombón river, El Pescado, J. Blanco, Buñirrigo, Rodríguez and El Gato streams (1997-1998) and in a intensive study carried out in the last two systems (1999). The taxa are ilustrated, a range of physical and chemical water variables of the sampling sites in which each species was found is furnished, together with the environmental requirements, cited in the literature. The 16 % of the algae were...
Tipo: Journal article
Palavras-chave: Chlorophyceae; Bacillariophyceae; New records; Lotic systems; Argentina.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000200001

FLORA Y VEGETACION DEL ESTERO REÑACA (V REGION, CHILE)
Provedor de dados: 73
Autores: San Martín,Cristina; Ramírez,Carlos; San Martín,José; Villaseñor,Rodrigo.
Se estudió la flora y la vegetación ruderal del sector urbano del estero Reñaca que cruza el balneario homónimo en la V Región de Chile, para conocer su grado de artificialización. Se trabajó con 44 censos de vegetación levantados con la metodología fitosociológica de la Escuela Zürich-Montpellier. La flora está formada por 73 especies de las cuales 63 se encontraron en los censos y 10 fuera de ellos. En la flora domina el elemento alóctono con 47 especies de malezas que contribuyen a formar el 76% de la cobertura total. En el espectro biológico dominan hierbas palustres perennes y malezas anuales. Las especies más importantes de la flora son Cotula coronopifolia, Apium nodiflorum, Polypogon australis, Scirpus americanus y Rorippa nasturtium-aquaticum. La...
Tipo: Journal article
Palavras-chave: Arroyos; Macrófitos; Flora; Vegetación; Chile central.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100004

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

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

Valor sistemático de la epidermis abaxial de la lámina foliar en especies americanas del género Trisetum Pers. (Poaceae: Pooideae: Aveninae)
Provedor de dados: 73
Autores: Finot,Víctor L.
Se estudió la epidermis abaxial de la lámina foliar en 29 especies y 3 variedades del género Trisetum s.s. Adicionalmente, se incluyó a Deschampsia brasiliensis (Louis-Marie) Valencia (= Trisetum brasiliense Louis-Marie), Helictotrichon bulbosum (Hitchc.) Parodi (= T. bulbosum Hitchc.) y Peyritschia deyeuxioides (Kunth) Finot (= T. deyeuxioides Kunth). Además, se realizaron observaciones de la epidermis adaxial en algunas especies sudamericanas, utilizando microscopio electrónico de barrido (MEB). Se confeccionó una matriz básica de datos (35 OTUs x 17 caracteres de la epidermis abaxial), a la que se aplicó análisis de agrupamientos (UPGMA) y análisis de componentes principales (ACP). Se reconoció cuatro grupos de especies: 1. Deschampsia brasiliensis. 2....
Tipo: Journal article
Palavras-chave: Anatomía foliar; Gramineae; Análisis de agrupamientos; Análisis de componentes principales.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000200002

Effects of two nitrogen-fixing invasive plants species on soil chemical properties in south-central Chile
Provedor de dados: 73
Autores: García,Rafael A; Fuentes-Ramírez,Andrés; Pauchard,Aníbal.
Dos especies invasoras leñosas, Acacia dealbata y Teline monspessulana (Fabaceae), ampliamente distribuidas en el centro-sur de Chile, poseen la capacidad de fijar biológicamente el nitrógeno atmosférico y contribuir a la fertilidad del suelo. Se presentan evidencias de potenciales cambios ocasionados por estas especies en las propiedades químicas del suelo en áreas altamente degradadas de la Región del Bío-Bío, Chile.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100020

HALLAZGO DE LAURELIOPSIS PHILIPPIANA (LOOSER) SCHODDE (ATHEROSPERMATACEAE) EN EL AREA COSTERA DE LA REGION DEL MAULE, CHILE CENTRAL
Provedor de dados: 73
Autores: Sepúlveda,César A.; Troncoso A.,Alejandro.
We report the finding of Laureliopsis philippiana (Looser) Schodde (Atherospermataceae) in the coastal area of the Maule Region (35°29' S and 72°22'W) in central Chile. The new locality (San Pedro - Las Cañas) extends by some 240 km the northern limit of the species, which is associated mainly with the temperate rainforests further south.
Tipo: Journal article
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000100006

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

SISTEMA REPRODUCTIVO EN CRINODENDRON PATAGUA MOL. (ELAEOCARPACEAE), UN ARBOL ENDEMICO DE CHILE CENTRAL
Provedor de dados: 73
Autores: Humaña,Ana María; Valdivia,Carlos E.
Se determinó el sistema reproductivo del árbol endémico de Chile central Crinodendron patagua, realizándose cuatro tratamientos de polinización dirigida más un control por polinización natural. Las flores de la prueba de agamospermia no fructificaron exitosamente, demostrando que la especie no es apomíctica. La prueba de autopolinización automática alcanzó un 6,9% de fructificación, a pesar del 27,7% de fructificación alcanzado en la prueba de autopolinización manual. La prueba de polinización cruzada alcanzó un 72,9% de fructificación exitosa, igualando el valor de fructificación en la prueba de polinización natural. De acuerdo a estos datos, C. patagua debe ser considerada como una planta autoincompatible, con un índice de incompatibilidad de 0,12,...
Tipo: Journal article
Palavras-chave: Autoincompatibilidad; Polinización; Semillas; Xenogamia.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000200002

Fenología reproductiva de Stenocereus thurberi (Cactaceae) en una región de transición del norte de Sinaloa, México
Provedor de dados: 73
Autores: Salomón-Montijo,Bladimir; Reyes-Olivas,Álvaro; Sánchez-Soto,Bardo H.
RESUMEN Los patrones fenológicos, moldeados por las interacciones físicas y bióticas en hábitats marginales, pueden revelar características únicas para la permanencia de una población. La fenología de Stenocereus thurberi, una cactácea columnar del Desierto Sonorense, ha mostrado variación geográfica asociada con el clima y los polinizadores, pero no se conoce su comportamiento en ambientes más húmedos de su área de distribución. El objetivo de esta investigación es describir la dinámica reproductiva y la estructura de tamaños de tres poblaciones en una transición matorral-bosque caducifolio de 170 km de longitud. Las plantas se caracterizaron por su talla, cobertura y número de tallos; los estados fenológicos se basaron en la escala de Campbell y se...
Tipo: Journal article
Palavras-chave: Reproducción; Fenología; Stenocereus thurberi; Llanura costera; Pie de montaña.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200381

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

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

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

NUEVOS LIMITES PARA LA DISTRIBUCION DE SALIX HUMBOLDTIANA WILLD., SALICACEAE, EN CHILE
Provedor de dados: 73
Autores: Hauenstein,Enrique; Peña-Cortés,Fernando; González,Marcos; Schlatter,Roberto.
Salix humboldtiana Willd. is reported for the first time from wetlands in the Araucanian Region of Chile. Furthermore, our inspection of existing herbarium collections shows that the range limits previously reported in the literature considerably underestimate the range of this species in Chile. These findings therefore represent an extension of the southern range limit of S. humboldtiana by ca. 2º of latitude (from 36º59' to 38º47'S), and an extension of the northern limit in Chile by more than 9º of latitude (27º21' to 18º35'S)
Tipo: Journal article
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100007

Variabilidad genética mediante AFLP en tres relictos de Gomortega keule (Molina) Baillon: especie endémica chilena en peligro de extinción
Provedor de dados: 73
Autores: Delaveau,Catherine; Fuentes-Arce,Glenda; Ruiz,Eduardo; Hasbún,Rodrigo; Uribe,Matilde; Valenzuela,Sofía.
Gomortega keule, especie arbórea endémica de Chile y única representante de la familia Gomortegaceae, se encuentra catalogada en peligro de extinción y despierta gran interés científico por su restringida área de distribución. El objetivo de este trabajo fue estimar la variabilidad genética de 24 individuos de G. keule ubicados en tres relictos de la provincia de Concepción, mediante marcadores AFLP (polimorfismos en la longitud de los fragmentos amplificados) para futuros estudios de conservación. Se probaron 16 combinaciones de partidores y se eligieron las tres combinaciones más informativas para detectar diferencias entre individuos. Estas combinaciones generaron un total de 156 fragmentos, siendo un 62 % de ellos polimórficos. El sitio con mayor...
Tipo: Journal article
Palavras-chave: Gomortegaceae; Laurales; Marcadores moleculares; Loci polimórfico.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200002

Karyotypic studies in the Chilean genus Placea (Amaryllidaceae)
Provedor de dados: 73
Autores: Cisternas,Mauricio A; Araneda,Loreto; García,Nicolás; Baeza,Carlos M.
Chromosome numbers and karyotypes of seven specific taxa of the Chilean endemic genus Placea were determined. Chromosome numbers of P. lutea, P. ornata, P grandiflora, P germainii andP. aff davidii are described for the first time. All taxa are diploid with 2«=2x=16 and karyotypes are composed of four metacentric (4 m), ten submetacentric (10 sm), and two subtelocentric (2 st) chromosomes. The most symmetrical karyotype was observed in P. lutea (AI: 6.84) while the most asymmetrical karyotype was shown by P. arzae (AI: 9.72). The constancy in karyotype formulae and high similarity in asymmetry indexes suggest that some orthoselection mechanism might be involved in Placea's chromosomal evolution. In spite that no significant karyotypic differences were...
Tipo: Journal article
Palavras-chave: Chile; Endemic flora; Hippeastreae; Karyology.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200005

Pollination and breeding system in Adesmia bijuga Phil. (Fabaceae), a critically endangered species in Central Chile
Provedor de dados: 73
Autores: GÓMEZ P,PERSY; LILLO,DIANA; GONZÁLEZ,ALEJANDRA V.
Adesmia bijuga Phil. is an endemic shrub in central Chile, classified as a critically endangered species of plant. After more than 100 years since its original description by R. A. Philippi (1884), the species was rediscovered exclusively in two locations of the Maule Region. One of them, Fundo San Pedro-Las Cañas, is close to extinction with a low number of shrubs, occurring in a disturbed habitat due to plantations of Pinus radiata. This study examined the pollination biology and breeding system of A. bijuga in order to explain their small number of shrubs. We estimated composition of pollinator species attracted to flowers and visitation rates. In order to describe its breeding system in A. bijuga we used manipulated treatments to estimate autonomous...
Tipo: Journal article
Palavras-chave: Critically endangered species; Adesmia bijuga; Pollination; Breeding system; Visitation rate.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200008

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

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

FALLOPIA JAPONICA (HOUTT.) RONSE DECR. (POLYGONACEAE): A NEW RECORD FOR THE ALIEN FLORA OF CHILE
Provedor de dados: 73
Autores: Saldaña,Alfredo; Fuentes,Nicol; Pfanzelt,Simon.
La especie introducida Fallopia japónica (Houtt.) Ronse Decr. es registrada por primera vez en Chile fuera de zonas urbanas. Se entrega descripción y fotografía de esta especie, potencial invasora de áreas silvestres protegidas. Los especímenes fueron colectados en la localidad de Coirentoso, borde del Parque Nacional Alerce Andino (41°27'11"S: 72°39'32"W).
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200014

EL GENERO JARAVA RUIZ ET PAV. (STIPEAE-POACEAE): DELIMITACION Y NUEVAS COMBINACIONES
Provedor de dados: 73
Autores: Peñailillo,Patricio.
Se reconoce para América del Sur el género Jarava Ruiz et Pav. Este género incluiría a todas aquellas especies tratadas frecuentemente por los agrostólogos sudamericanos dentro de Stipa L. s.l. cuyos antecios presentan rasgos morfológicos asociados a una anemocoría especializada (Stipa subgen. Jarava, Stipa subgen. Ptilostipa y Stipa subgen. Pappostipa). La presencia de pelos largos en el ápice de la lema formando un pappus, o bien, de aristas plumosas o paposas, se interpretan como novedades evolutivas, es decir, caracteres avanzados a una dispersión de las diásporas por el viento. También, se incluyen dentro de Jarava aquellas especies que han evolucionado hacia una cleistogamia aérea axilar. Se realiza una enmienda del género y se dan a conocer las...
Tipo: Journal article
Palavras-chave: Jarava Ruiz et Pav.; Stipeae; Poaceae; Sudamérica; Nuevas combinaciones.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100005

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

Sphericity and smaller pollen-size are better represented in introduced rather than native plant species
Provedor de dados: 73
Autores: ARREDONDO-NÚÑEZ,ALICIA X; SALGADO,OSCAR; MOLINA-MONTENEGRO,MARCO A.
Mayor esfericidad y menor tamaño son dos de los principales rasgos presentes en granos de polen sugeridos para aumentar la dispersión por viento y polinizadores. Considerando el aumento en la pérdida de hábitat y la deforestación, cualquier rasgo que mejore la dispersión del polen podría ayudar a mantener y aumentar los límites de distribución de las poblaciones vegetales. En este estudio se muestra que las especies introducidas presentan significativamente granos de polen de menor tamaño y más esféricos que especies nativas, lo cual podría aumentar su éxito de dispersión.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200024

Estructura y fenología reproductiva de una población remanente de Adesmia bijuga Phil., Fabaceae, en un hábitat costero mediterráneo perturbado de Chile central
Provedor de dados: 73
Autores: GÓMEZ,PERSY; HAHN,STEFFEN; SAN MARTÍN,JOSÉ.
In this note we examine the population structure and breeding phenology of Adesmia bijuga Phil. The area of development of the study was Curepto, Maule Región, central Chile. Our results indicate a high vulnerability of local extinction of the studied population due low population size and disturbed habitat. Flowering and fructification of individuals exists, nevertheless absence of seedlings suggesting restrictions to the regeneration in the population of A. bijuga. It is recommended to continue with the research. Actions of conservation ex situ for the species are realized by the botanical garden of the Talca University.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100016

Heliotropium geissei (Heliotropiaceae): nuevos registros, tipificación, posición sistemática y estado de conservación
Provedor de dados: 73
Autores: LUEBERT,FEDERICO; MUÑOZ-SCHICK,MÉLICA.
Se reportan nuevos registros de Heliotropium geissei, una especie rara de Chile central. La nomenclatura de la especie es revisada y se refina su lectotipificación. Análisis filogenéticos moleculares confirman su posición sistemática como miembro de la sección Plagiomeris. Se proporciona una clave de identificación de las especies de la sección Plagiomeris. Se evalúa su estado de conservación y se sugiere la categoría UICN de En Peligro (EN).
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100006

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

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

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

Observations and comments on the diatom Stephanodiscus minutulus (Kützing) Cleve &amp;amp; Möller (Bacillariophyceae) found for the first time in Chile from bottom sediments collected in Lake Laja
Provedor de dados: 73
Autores: Cruces,Fabiola; Rivera,Patricio; Urrutia,Roberto.
This study reports the presence of the diatom Stephanodiscus minutulus (Kützing) Cleve &amp;amp; Möller for the frst time in Chilean continental waters; it is a taxon reported in many aquatic systems in Europe and North America and there are only scanty records from South America (Argentina). The species was found in a sedimentary profle collected from Lake Laja (Andes Mountains), Central Chile. The principal morphological features of S. minutulus are described, and comments about its relationship with other closely related taxa are given.
Tipo: Journal article
Palavras-chave: Morphology; New record; Related taxa; Variability; Trophic state.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100002

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

EL CARIOTIPO DE BOMAREA PATINII BAKER SUBSP. PATINII (ALSTROEMERIACEAE)
Provedor de dados: 73
Autores: Baeza,Carlos M; Alzate,Fernando; Negritto,María; Ruiz,Eduardo.
The karyotype oí Bomarea patinii Baker subsp. patinii from Colombia was examined. The species has a karyotype 2n = 2x= 18, with a haploid formula 2m + lsm+ 5st+ lt-sat. The reported karyotype is asymmetric (Asl %= 75.51). The most of the chromosomes are acrocentric. This results are compared with other species oiBomarea from South America.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200010

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

RECUENTOS CROMOSOMICOS EN PLANTAS QUE CRECEN EN CHILE: I
Provedor de dados: 73
Autores: Baeza,Carlos M.; Kottirsch,Gabriele; Espejo,Jaime; Reinoso,Rodrigo.
Se entregan datos citológicos del número diploide de cromosomas de 15 especies de la flora vascular de Chile. Se utiliza material de raíces provientes de plántulas y bulbos cultivados en invernaderos. Las plantas estudiadas corresponden a representantes de Alstroemeriaceae, Asteraceae, Gomortegaceae, Iridaceae, Lauraceae, Orchidaceae, Poaceae y Tecophilaeaceae
Tipo: Journal article
Palavras-chave: Números cromosómicos; Flora vascular de Chile.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000200004

EFFECTS OF INORGANIC FERTILIZERS AND RHIZOBIAL INOCULATION ON GROWTH, NODULATION AND TANNIN CONTENT OF ACACIELLA ANGUSTISSIMA (MILL.) BRITTON &amp;amp; ROSE
Provedor de dados: 73
Autores: Ruiz-Valdiviezo,Víctor M; Ayora-Talavera,Teresa R; Gutiérrez-Miceli,Federico A; Dendooven,Luc; Rincón-Rosales,Reiner.
The effects of different inorganic fertilizers and rhizobial inoculation on shoot height, total shoot and root dry weight, nodule number, total shoot nitrogen, nitrogenase activity and tannic acid content of Acaciella angustissima (Mill.) Britton &amp;amp; Rose were investigated in the laboratory. Seedlings were grown in a climate chamber in glass tubes containing sterilized mixture of vermiculite and peat moss, and treated with combinations of nitrogen (N) at 45 mg plant¹, phosphorus (P) at 30 mg plant¹, potassium (K) at 20 mg plant¹ and inoculated with the bacterium Sinorhizobium mexicanum. The combined applications of N, P or K to uninoculated plants increased shoot height and dry weight as compared to the unamended plantlets. The tannin content in...
Tipo: Journal article
Palavras-chave: Acetylene reduction; Growth chamber; N P K fertilizer; Sinorhizobium mexicanum.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200007

El paisaje rural antropogénico de Aisén, Chile: Estructura y dinámica de la vegetación
Provedor de dados: 73
Autores: RAMÍREZ,CARLOS; SANDOVAL,VÍCTOR; SAN MARTÍN,CRISTINA; ÁLVAREZ,MlGUEL; PÉREZ,YÉSSICA; NOVOA,CARLA.
Se estudió la dinámica de degradación de la vegetación en un mosaico vegetal antropogénico del paisaje rural de la Región de Aisén para establecer las posibles relaciones de origen tanto espacial como temporal entre las comunidades y proponer series de degradación. Se trabajó con metodología fitosociológica levantando 50 censos de vegetación. La tabla inicial fue ordenada usando especies diferenciales en 7 comunidades: matorral de ñire (Anemone multifida-Nothofagus antarctica), silvopastoreo con ñire, silvopastoreo con chacay, pradera de trébol-ballica (Bromus catharticus-Trifolium repens), pradera de chépica-cadillo (Acaena ovalifolia-Agrostis capillaris), pradera de cadillo-Aira y estepa de cadillo, las que se compararon en sus espectros sistemáticos,...
Tipo: Journal article
Palavras-chave: Patagonia chilena; Vegetación; Dinámica; Degradación antrópica.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200001

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

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

Two new records of the genus Lecanora Ach. from Argentina
Provedor de dados: 73
Autores: DE LA ROSA,IRIS NADIA; MESSUTI,MARÍA INÉS.
Dos especies del género Lecanora, L. albella (Pers.) Ach. y L. hypocrocina Nyl., son registradas por primera vez para la Argentina. Se presentan comentarios, ilustraciones y mapa de distribución de las dos especies.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200019

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

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

Ponthieva nicolasii (Orchidaceae), una nueva especie para Hidalgo, México
Provedor de dados: 73
Autores: BERTOLINI,VINCENZO; ARCHILA MORALES,FREDY.
ABSTRACT Field studies in the Mezquital Valley of the state of Hidalgo, Mexico, allowed to locate a population of a specie belonging to the genus Ponthieva R.Br. Comparing the specifies entity to other species of Mexican Ponthieva, we conclude that it is a new taxon, with strong differences between it and the other ones. We report taxonomic diagnosis, descriptor and botanical icon for acceptance.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200462

NON-SYMBIOTIC NITROGEN FIXATION, NET NITROGEN MINERALIZATION AND DENITRIFICATION IN EVERGREEN FORESTS OF CHILOÉ ISLAND, CHILE: A COMPARISON WITH OTHER TEMPERATE FORESTS
Provedor de dados: 73
Autores: Pérez,C.A.; Carmona,M.R.; Armesto,J.J.
Temperate forests in southern Chile offer unique opportunities for studying biogeochemical cycles in the absence of industrial air pollution. Here we compare three important fluxes of the nitrogen (N) cycle in temperate forests of southern Chile, non-symbiotic N fixation, net N mineralization and denitrification, with data from northern temperate forests more affected by air pollution. We studied five evergreen, old-growth forests and one second-growth forest in Chiloé Island, southern Chile. Non-symbiotic N fixation in the litter layer, mineral soil and coarse woody debris was estimated by the acetylene reduction technique. In situ net-N mineralization in the upper mineral soil layer was assessed by the buried bag method. Denitrification rates of mineral...
Tipo: Journal article
Palavras-chave: Denitrification; Nitrogen cycle; Nitrogen fixation; Temperate forests; Unpolluted forests.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100005

PREFACE: BIOGEOCHEMICAL CYCLES IN TEMPERATE FOREST ECOSYSTEMS
Provedor de dados: 73
Autores: Oyarzún,Carlos E.
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100001

Plant growth regulators optimization for in vitro cultivation of the orchid Guarianthe skinneri (Bateman) Dressier &amp;amp; W.E.Higgins
Provedor de dados: 73
Autores: Coello,Christian Yanelly; Miceli,Clara Luz; Orantes,Carolina; DenDooven,Luc; Gutiérrez,Federico Antonio.
An in vitro culture procedure was developed to induce shoots and roots of Guarianthe skinneri (Orchidaceae) plantlets regenerated from seed-derived protocorms on a Murashige and Skoog (MS) médium supplemented with 6-benzyladenine (BA), indole-3-acetic acid (IAA), a-naftalenacetic acid (NAA) and gibberellic acid (GA3). A máximum of 10.6 shoots was obtained with 16.1 &amp;#956;M NAA, 17.1 &amp;#956;M IAA, 6.3 x 10-9 &amp;#956;M GA3 and 0.0023 &amp;#956;M BA. A máximum of 4.0 roots on each shoot with 5.4 &amp;#956;M NAA, 17.1 &amp;#956;M IAA, 0.001 &amp;#956;M AG3 and 4.6 x 10-9 &amp;#956;M BA. Máximum shoot and root length was obtained with a minimum of GA3, but a máximum IAA. GA3, was the main factor controlling shoot and root induction and elongation.
Tipo: Journal article
Palavras-chave: 6-benzyladenine; Indole-3-acetic acid; A-naftalenacetic acid; Gibberellic acid; Shoot induction; Rooting.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100003

Positive photoblastic response of seed germination in Eriosyce subgen: Neoporteria (Britton &amp;amp; Rose) Helmut Walter (Cactaceae)
Provedor de dados: 73
Autores: Guerrero,Pablo C; Alves-Burgos,Lua; Peña-Gómez,Francisco T; Bustamante,Ramiro O.
Realizamos un experimento de laboratorio para evaluar el efecto de la luz blanca en la germinación de cinco taxa de Eriosyce subgen. Neoporteria. Todas las taxa germinaron profusamente con presencia de luz, mientras que en oscuridad casi no se registró germinación. Se discute que este rasgo fisiológico podría ser una respuesta conservada en el grupo Neoporteria.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100013

SISTEMA DE CRUZAMIENTO Y ESTIMACIONES EN LA EFICIENCIA DE POLINIZACIÓN SOBRE TRICHOCEREUS PASACANA (CACTACEAE) EN DOS POBLACIONES DEL NOROESTE ARGENTINO
Provedor de dados: 73
Autores: Badano,Ernesto I.; Schlumpberger,Boris O.
Los objetivos de este estudio fueron analizar el sistema de cruzamiento y la eficiencia de la polinización en Trichocereus pasacana y sus efectos sobre la reproducción. Se trabajó sobre dos poblaciones del noroeste Argentino, una dentro de un área protegida (Valle de Tin Tin) y otra en un sitio con marcada actividad humana de agricultura y apicultura (Cachi Adentro). El sistema de cruzamiento se analizó mediante un experimento donde se evaluó autopolinización manual, polinización cruzada manual, polinización natural y autopolinización automática. Las variables de respuesta fueron producción de frutos, producción de semillas y capacidad germinativa. La producción de frutos permite sugerir que el sistema de cruzamiento de T. pasacana es xenogámico y que la...
Tipo: Journal article
Palavras-chave: Polinización; Sistema de cruzamiento; Actaceae; Cactus columnares; Argentina.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000200002

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

Reversible in vivo cellular changes occur during desiccation and recovery: Desiccation tolerance of the resurrection filmy fern Hymenophyllum dentatum Cav.
Provedor de dados: 73
Autores: Bravo,Soraya; Parra,María José; Castillo,Rosario; Sepúlveda,Francisco; Turner,Aileen; Bertín,Ariana; Osorio,Germán; Tereszczuk,Joanna; Bruna,Carola; Hasbún,Rodrigo.
ABSTRACT The present work explores in vivo physiological, morphological and chemical features during full hydration, desiccation and rehydration of the filmy fern Hymenophyllum dentatum with two main objectives: 1) to get further insight about the mechanisms underlying its desiccation tolerance, and 2) to understand how this plant manages mechanical stress induced by water loss and recovery. With these purposes, physiological (relative water content and F /F chlorophyll fluorescence parameter), morphological (Confocal Laser Scanning Microscopy and 3D reconstruction) and chemical (FT- IR microspectroscopy) data were obtained and compared between fully hydrated, desiccated and rehydrated tissues of H. dentatum. Remarkable changes in cell architecture and...
Tipo: Journal article
Palavras-chave: Hymenophyllum; Desiccation tolerance; Confocal 3D microscopy; FT-IR microspectroscopy; Rapid dehydration/rehydration.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200402

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

Extensión del límite austral de Persea lingue (Lauraceae) al sur de la Provincia de Palena, Región de los Lagos, Chile
Provedor de dados: 73
Autores: Ezcurra,Cecilia.
The finding of Persea lingue (Miers ex Bertero) Nees (Lauraceae) in the south of the province of Palena, Region X of Los Lagos, Chile, is reported. The new locality (Puerto Piedra: 43º 26' S, 72º 09' W) extends by some 250 km the southern limit previously described for the species in Chile. This is the first report of P. lingue from the North Patagonian rainforest. This species belonging to a mainly tropical genus had previously been associated with the warmer Valdivian, temperate-deciduous and sclerophyllous forests found in Chile further north.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100009

Reproducción vegetativa y número cromosómico de Adesmia bijuga Phil. (Fabaceae), una especie endémica en peligro crítico de la Región del Maule, Chile
Provedor de dados: 73
Autores: GÓMEZ,PERSY; BAEZA,CARLOS M.; HAHN,STEFFEN.
In this note the vegetative reproduction and chromosome number of Adesmia bijuga Phil., an endemic shrub of Central Chile, that is classified as a critically endangered species, is investigated. Our results indicate a positive response of A. bijuga to the shoot rooting by means of promoting hormones. The chromosome number of A. bijuga is 2n = 20. Most of the chromosomes are metacentrics and of small size.
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100017

On the identity of the new family Pycnanthaceae Ravenna
Provedor de dados: 73
Autores: NICOLA,MARCELA V.
The taxonomic position of a new family of flowering plants recently described, Pycnanthaceae Ravenna, is here discussed; as a result of comparison of type material, this new taxon is placed in the synonymy of the genus Malaxis within the Orchidaceae. A list of species of Malaxis growing in Argentina is provided, as well as a key to differentiate them.
Tipo: Journal article
Palavras-chave: Argentina; Malaxis; Orchidaceae; Pycnantha; Taxonomy.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200012

Volutaria tubuliflora (Murb.) Sennen (Asteraceae), nueva especie alóctona asilvestrada para Chile
Provedor de dados: 73
Autores: TEILLIER,SEBASTIÁN; MACAYA,JORGE; SUSANNA,ALFONSO; CALLEJA,JUAN ANTONIO.
Volutaria tubuliflora (Asteraceae-Carduae) is described as a new alien plant species in Chilean vascular flora. The species has the widest range of natural geographical distribution of the genus being present from southern Europe to Arabic peninsula, inclusive Macaronesia. In Chile it has been naturalized in the Desert ecoregion, and it growths in the Atacama Region (III). Plants were found at Panamericana highway border, and apparently still have not invaded outside. In this paper we provide morphological and ecological information for this species.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200012

Novedades nomenclaturales para Gaultheria (Ericaceae) en Chile
Provedor de dados: 73
Autores: TEILLIER,SEBASTIÁN; RODRÍGUEZ,ROBERTO; FRITSCH,PETER W.
Una actualización de Gaultheria en el marco del proyecto "Flora de Chile" nos ha llevado a proponer dos nuevas combinaciones y una lectotipificación para este género. Pernettya linifolia Phil. fue descrita por R.A. Philippi, y posteriormente incluida, ya sea en Gaultheria (Pernettya) mucronata o en Gaultheria (Pernettya) poeppigii; en este trabajo se propone que se trata de una buena especie, que de acuerdo con la nomenclatura actual de las ericáceas, debería denominarse Gaultheria linifolia (Phil.) Teillier &amp;amp; R.A. Rodr. La combinación Gaultheria angustifolia (Lindl.) Teillier fue recientemente publicada para otra especie de Chile y Argentina, pero se demostró que el nombre constituye un homónimo posterior a Gaultheria angustifolia Brandegee, una...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100008

Polysporina simplex (Davies) Vézda (Acarosporaceae, Ascomycota) new to Chile
Provedor de dados: 73
Autores: Vargas Castillo,Reinaldo.
Polysporina simplex (Davies) Vézda es citada por primera vez para la flora criptogámica chilena. El material utilizado fue recolectado en el sector Ocoa en el Parque Nacional La Campana, en la zona central de Chile. La morfología, anatomía y química fueron revisadas y se entrega una descripción del material encontrado, su hábitat y distribución.
Tipo: Journal article
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100019

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

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

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

NITROGEN RUNOFF AND LEACHING LOSSES IN BEEF PRODUCTION SYSTEMS UNDER TWO DIFFERENT STOCKING RATES IN SOUTHERN CHILE
Provedor de dados: 73
Autores: Alfaro,Marta; Salaza,Francisco; Iraira,Sergio; Teuber,Nolberto; Ramírez,Luis.
The Lakes Region of Chile produces 60% of the country's milk and 45% of its meat. Production is expected to increase in the near future, yet there are few data on the environmental impact of local livestock systems. A field experiment was carried out during 2004 to measure nitrogen (N) runoff and leaching losses in beef cattle-grazing production systems near Osorno. Grazing was carried out with Holstein-Friesian steers of 220 kg of initial live weight, with stocking rates of 3.5 and 5 steers ha-1. Water samples were collected during 6.5 months with surface lysimeters and ceramic cups, and were analyzed for nitrate and ammonium. Total losses were calculated as the product of N concentration and accumulated drainage at each sampling date. A significant...
Tipo: Journal article
Palavras-chave: Andisol; Ammonium; Nitrate; Livestock production.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200008

Liqúenes de Aisén, sur de Chile
Provedor de dados: 73
Autores: Quilhot,Wanda; Cuellar,Mauricio; Díaz,Rodrigo; Riquelme,Francisco; Rubio,Cecilia.
La micobiota liquénica de la Región de Aisén incluye 319 especies en 87 géneros; el número total de especies de los géneros Menegazzia y Protousnea registrados en Chile se encuentran en esta región. La diversidad de biomas, desde bosques templado-lluviosos, particularmente en zonas oceánicas, a áreas estepáricas, ofrece una variedad de macro y microhabitats favorables para los líquenes. La mayor diversidad liquénica (56 %) se registró en un área silvestre no intervenida en el Parque Nacional Laguna San Rafael. La diversidad específica es más elevada en bosques templado-lluviosos que en zonas estepáricas, en estas últimas se registró la mayoría de los líquenes antárticos (23.0 %). El endemismo es más bien elevado (26.0 %); numerosas especies de los géneros...
Tipo: Journal article
Palavras-chave: Diversidad liquénica; Endemismo; Áreas estepáricas; Biogeografía.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100007

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

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

Líquenes epífitos: una herramienta para estudiar la continuidad ecológica en Isla Mocha, Chile
Provedor de dados: 73
Autores: GATICA,ALEJANDRO; PEREIRA,ÍRIS; VALLEJOS,OSCAR.
El propósito de este trabajo fue estudiar la continuidad ecológica en la Reserva Nacional Isla Mocha, mediante el conocimiento de la riqueza y frecuencia de líquenes epífitos en 14 parcelas distribuidas al azar al interior de la reserva. La biomasa arbórea y volumen fustal fueron cuantificados para establecer correlaciones que pudieran explicar la distribución de líquenes epífitos. Se propone un nuevo índice de continuidad ecológica mediante cianolíquenes (ICEC) para conocer el grado de alteración de este ecosistema natural. La riqueza total de hongos liquenizados fue de 33 especies, de las cuales 3 constituyen nuevos registros para Chile: Fissurina triticea; Pyrenula neglecta y Sticta subcaperata. Se encontró una relación estadísticamente significativa...
Tipo: Journal article
Palavras-chave: Biomasa arbórea; Índice de continuidad ecológica; Líquenes epífitos; Riqueza; Volumen.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200014

PRODUCCION DE PIGMENTOS Y PROTEINAS DE LA CIANOBACTERIA ANABAENA PCC 7120 EN RELACION A LA CONCENTRACION DE NITROGENO E IRRADIANCIA
Provedor de dados: 73
Autores: Loreto,César; Rosales,Néstor; Bermúdez,José; Morales,Ever.
Algunas cianobacterias del género Anabaena son productoras de pigmentos de interés comercial. Este artículo documenta el efecto de la concentración de nutrientes en función del NaNO3 a 0, 1, 2, 4 y 8 mM y de la irradiancia a 78, 156 y 238 µmol m-2 s-1, sobre el contenido de proteínas y pigmentos de Anabaena PCC 7120 en cultivos discontinuos. El crecimiento de la cianobacteria fue poco afectado por la concentración de nitrato, sin diferencia significativa entre 1 y 8 mM (p &lt; 0,05). Sin embargo, a 8 mM se alcanzaron los valores más elevados de ficocianina (174 ± 2 µg ml-1), clorofila a (17,4 ± 1,2 µg ml-1), proteínas (563 ± 2 µg ml-1) y carotenoides (4,5 ± 0,3 µg ml-1). Aunque las mayores densidades celulares (117 (± 11) x 10(6) células ml-1) se...
Tipo: Journal article
Palavras-chave: Clorofila a; Cianobacteria; Ficocianina; Nitrato; Nutrientes.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200001

VALIDACION DE ALSTROEMERIA CITRINA PHIL. (ALSTROEMERIACEAE)
Provedor de dados: 73
Autores: Eyzaguirre Philippi,M. Teresa.
The collection oí Alstroemeria citrina Phil, in the mountains of Alicahue, located in the province of Petorca, Region of Valparaiso (November 2002), and north of Pedernales in the south of the Province of Choapa, Region of Coquimbo (November 2007), is described. The last location corresponds to the site where it was first described by Philippi in 1865. This plant had never been collected since.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200012

Phytoplasma infection alters morpho-anatomical and physiological traits in Ugni molinae Turcz.
Provedor de dados: 73
Autores: ATALA,CRISTIAN; MOYA-URRUTIA,VICTORIA.
The "murtilla" (Ugni molinae Turcz., Myrtaceae), present in Contulmo Natural Monument (Araucanía Region, Chile), is affected by witches'broom disease, caused by the presence of a phytoplasma in the sieve tubes of the phloem. This phytoplasma affects plants morphoanatomically, producing evident symptoms. Infected branches show reddening of leaves and general dwarfism. In the present study, we compared morphoanatomically and physiologically branches (modules) of murtilla with and without symptoms of witches'broom disease. This was done in order to quantitatively evaluate the actual effect of the infection on adult plants. We cut branches of similar age, with and without symptoms, where we measured fluorescence, chlorophyll content, specific leaf area, stem...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100005

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

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

Nuevos registros de hepáticas (Marchantiophyta) para la Región de Los Ríos, Chile
Provedor de dados: 73
Autores: CUVERTINO-SANTONI,JORGE; OSORIO-ZÚÑIGA,FELIPE; CHAURA,RODRIGO.
Fifteen new regional and one new provincial record are reported for Los Ríos Region, Chile. Notes on the geographical distribution and specimen data are provided for each taxon.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200018

Frankophila sudamericana sp. nov., a new diatom species (Bacillariophyta) found in Salar de Aguas Calientes and Salar de Huasco, high altitude Andean localities in northern Chile
Provedor de dados: 73
Autores: RIVERA,PATRICIO; CRUCES,FABIOLA.
Se describe a Frankophila sudamericana Rivera &amp;amp; Cruces como una nueva especie de diatomea. El taxón se caracteriza por poseer valvas linear-elípticas, estrías (10 en 10 &amp;#956;m, raramente 9) formadas por tres hileras de aréolas, espinas huecas y no bifurcadas, y por su área axial plana y carente de depresiones. Se señalan las principales diferencias existentes con las restantes especies del género, especialmente con F. wayqechae Furey et al.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200017

¿Es Alstroemeria pulchra Sims var. maxima Phil. (Alstroemeriaceae) un miembro del complejo A. magnifica Herbert?: Estudio colorimétrico de los tépalos externos e internos de la flor
Provedor de dados: 73
Autores: FINOT,VÍCTOR L.; BAEZA,CARLOS M.; MELÍN,PEDRO; NOVOA,PATRICIO; CAMPOS,JORGE; RUIZ,EDUARDO; FUENTES,GLENDA; ALBORNOZ,PAULA; CARRASCO,PEDRO.
Alstroemeria pulchra var. maxima es un taxón endémico de Chile descrito por R.A. Philippi en 1864, cuya posición sistemática es controversial; aunque Bayer en 1987 transfiere este taxón a A. magnifica con el rango de subespecie, Muñoz &amp;amp; Moreira en 2003 retoman el concepto original de Philippi. Con el objetivo de proporcionar nuevos caracteres para decidir si A. pulchra var. maxima es un miembro del complejo A. magnifica o debe permanecer como una variedad de A. pulchra como fue originalmente descrita, se analizó el color de los tépalos externos, internos superiores e interno inferior, utilizando un espectrofotómetro colorímetro Hunterlab Colorquest. Se trabajó con flores de ocho poblaciones de Alstroemeria L. pertenecientes a estas dos especies...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100013

ESTRUCTURA Y DINAMICA DE UNA POBLACION DE GOMORTEGA KEULE (MOL.) BAILLON EN UN RODAL ANTIGUO DE BOSQUE VALDIVIANO, CORDILLERA DE NAHUELBUTA, CHILE
Provedor de dados: 73
Autores: Villegas D.,Paola; Le Quesne,Carlos; Lusk,Christopher H.
Gomortega keule (Mol.) Baillon es un árbol endémico de Chile, que se encuentra actualmente en peligro de extinción. Aunque los patrones de regeneración de la especie se desconocen, algunos autores aluden a una generalizada escasez de plántulas. Este artículo presenta una investigación de la estructura poblacional y los patrones de regeneración de G. keule en un bosque antiguo en Caramávida, Cordillera de Nahuelbuta. Los objetivos fueron (i) determinar el patrón de regeneración que esta especie ha presentado en el pasado, (ii) verificar si existe actualmente regeneración sexual de G. keule y (iii) caracterizar los ambientes lumínicos en que ésta se produce. En una parcela de 0,24 ha se midió el diámetro a la altura de pecho (DAP) y la posición espacial de...
Tipo: Journal article
Palavras-chave: Caramávida; Dinámica forestal; LAI-2000; Rareza; Regeneración.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200005

Plant communities as bioclimate indicators on Isla Navarino, one of the southernmost forested areas of the world
Provedor de dados: 73
Autores: Molina,José Antonio; Lumbreras,Ana; Benavent-González,Alberto; Rozzi,Ricardo; Sancho,Leopoldo G.
ABSTRACT Variation in climactic vegetation with altitude is widely used as an ecological indicator to identify bioclimatic belts. Tierra del Fuego is known to undergo structural and functional changes in forests along altitudinal gradients. However there is still little knowledge of the changes in plant-community composition and plant diversity -including both forests and tundra and their area of contact (krummholz)- and their relation to climatic factors along an altitudinal gradient. This study focuses on Isla Navarino (Chile), at the eastern part of Beagle Channel, included in the Cape Horn Biosphere Reserve. Numerical analysis revealed four community types along the cited gradient: a) mixed forest of Nothofagus betuloides and Nothofagus pumilio...
Tipo: Journal article
Palavras-chave: Altitudinal gradient; Bioclimatic zones; Cape Horn Biosphere Reserve; Species diversity; Sub-Antarctic habitats.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200391

Nuevos registros y lista actualizada de las algas verdes (Chlorophyta) del litoral de Veracruz, México
Provedor de dados: 73
Autores: GARCÍA-LÓPEZ,DEISY Y.; MATEO-CID,LUZ ELENA; MENDOZA-GONZÁLEZ,A. CATALINA.
RESUMEN Se llevó a cabo una revisión bibliográfica y de herbario de las algas verdes (Chlorophyta) que han sido registradas para el litoral de Veracruz, México. Además se incorporaron los datos obtenidos de muestreos realizados en doce localidades de 2006 a 2016. Se determinó la presencia de 93 especies de algas verdes, siendo la familia Cladophoraceae la mejor representada con 28 especies, seguida de Ulvaceae con 15 y Caulerpaceae con 12. La lista florística se acompaña de datos sobre estacionalidad, reproducción, hábitat y referencias. De los 93 taxa, 19 son nuevos registros para el litoral de Veracruz, y se cita por primera vez a Ulva profunda, Chaetomorpha vieillardii y Stigeoclonium tenue para la costa occidental del Atlántico de México. Por otro...
Tipo: Journal article
Palavras-chave: Ulvophyceae; Inventario; Épocas climáticas; Riqueza específica.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100041

Floraciones de fitoplancton y variación de la estructura comunitaria fitoplanctónica en tres lagos someros eutróficos de Chile Central
Provedor de dados: 73
Autores: Almanza,Viviana; Parra,Oscar; De M. Bicudo,Carlos E.; González,Mariela A.; Lopez,Marcela; Urrutia,Roberto.
RESUMEN La comunidad fitoplanctónica de tres lagos someros eutróficos ubicados en la misma zona geográfica fue comparada durante un periodo de tres años. Aunque estos lagos son similares en muchos aspectos (p.ej. ubicación, origen, profundidad media, alta concentración de nutrientes, influencia humana) desarrollan comunidades de fitoplancton muy diferentes. En Lo Galindo dominan Zygnematophyceae, Cyanophyceae y Chlorophyceae, en Lo Méndez Dinophyceae y Bacillariophyceae y en Las Tres Pascualas Chlorophyceae, Cryptophyceae y Euglenophyceae. En Lo Méndez y Lo Galindo se presentaron frecuentes floraciones de diferentes grupos de microalgas (cianobacterias, algas verdes, diatomeas y dinoflagelados), las que generaron aumentos de abundancia en diferentes épocas...
Tipo: Journal article
Palavras-chave: Floraciones; Comunidad de fitoplancton; Grupos funcionales; Estado trófico; Lagos urbanos.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200191

Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values
Provedor de dados: 73
Autores: Alvarez,Miguel; Mõseler,Bodo Maria; San Martín,Cristina.
The use of mean value for the analysis of Ellenberg indicator values in plots or plant community types has been criticised by several authors. On the other hand, little attention has been paid to distribution patterns of the respective classes frequencies. Herewith we make a revision of metrics available for the characterization of tendency and distribution patterns of ordinal variables, like in the case of Ellenberg indicator values, and discuss their relation to frequency histogram shapes. We selected three tendencies (mean value, median value and mode) and two distribution metrics (position index and relative dominance). Additionally, we proposed a concentration index, which is analogous to the contagion index commonly used by landscape ecologists....
Tipo: Journal article
Palavras-chave: Bio-indicators; Ecological monitoring; Grassland vegetation; Species composition.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200006

OXALIS NOVEMFOLIALATA, A NEW SPECIES OF OXALIS SECT: CARNOSAE ENDEMIC TO THE ATACAMA DESERT OF NORTHERN CHILE
Provedor de dados: 73
Autores: Heibl,Christoph; Marticorena,Clodomiro.
Se describe Oxalis novemfoliolata Heibl &amp;amp; Martic. del desierto de Atacama, Chile. Hasta ahora ha sido encontrada solamente en Falda Verde cerca de Chañaral. Se distingue de las demás especies halladas en el territorio chileno por sus hojas en su mayoría 9-folioladas. Tanto la morfología del cáliz, forma de vida y suculencia, así como los marcadores moleculares, la agrupan a la sección Carnosae.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100012

Fallopia sachalinensis (F.Schmidt) Ronse Decr. (Polygonaceae): a new record for the alien flora of Chile
Provedor de dados: 73
Autores: FUENTES,NICOL; MARTICORENA,ALICIA; SALDAÑA,ALFREDO.
La especie introducida Fallopia sachalinensis (F.Schmidt) Ronse Decr. es registrada por primera vez en el territorio chileno, naturalizada fuera de zona urbanas. Se entrega la descripción taxonómica, características ecológicas de la especie y de la población registrada, así como también la fotografía de ésta. Los especímenes fueron recolectados en ambos costados de la carretera que une la ciudad de Osorno con el aeropuerto Cañal Bajo de la misma ciudad (40°35'55''S; 73°03'50''W).
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200026

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

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

EN LA SENDA DE LA EXTINCIÓN: EL CASO DEL ALGARROBO PROSOPIS CHILENSIS (FABACEAE) Y EL BOSQUE ESPINOSO EN LA REGIÓN METROPOLITANA DE CHILE CENTRAL
Provedor de dados: 73
Autores: Valdivia,Carlos E; Romero,Cristian R.
En la zona central de Chile se encuentra el bosque espinoso de Acacia caven y Prosopis chilensis, donde persiste menos del 40% de su superficie original, aunque sin representación en las áreas silvestres protegidas. Debido a la acción del ganado, se ha sugerido una contracción poblacional de P. chilensis acoplado a una expansión poblacional de A. caven lo cual, sin embargo, no ha sido verificado empíricamente. En cuatro sitios correspondientes a dos microcuencas de la Región Metropolitana en Chile (Batuco y Huechún), se evaluó la incidencia de las perturbaciones ambientales (ganado, conejos, malezas, basuras), el estado fitosanitario y estructura poblacional de P. chilensis, así como las dinámicas de regeneración de este árbol y A. caven, mediante el uso...
Tipo: Journal article
Palavras-chave: Algarrobos; Espinos; Degradación ambiental; Extirpaciones futuras.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100007

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

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

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

NOVEDADES EN LA FAMILIA ALSTROEMERIACEAE
Provedor de dados: 73
Autores: Muñoz Schick,Mélica.
Se describe Alstroemeria lutea M.Muñoz, Alstroemeria achirae M.Muñoz et Brinck y Alstroemeria werdermannii var. flavicans M.Muñoz como especies y variedad nuevas para la ciencia. Se presentan descripciones, distribución geográfica y fotografías en color de cada una de ellas. Se complementa la descripción de Alstroemeria modesta Phil. Se describe Leontochir ovallei Phil. var. luteus para una variedad con flores de color amarillo
Tipo: Journal article
Palavras-chave: Taxonomía; Alstroemeria; Leontochir (Alstroemeriaceae); Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100004

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

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

Nuevas combinaciones, una epitipificación y una corrección nomenclatural en Thelocephala (Cactoideae: Notocacteae): género endémico de Chile
Provedor de dados: 73
Autores: SALDIVIA PÉREZ,PATRICIO; FAÚNDEZ YANCAS,LUIS.
Within the revision works of the Thelocephala genus it is necessary to carry out new combinations for generic entities recently described under the broad concept of Eriosyce. Additionally, it has been made a correction for one of the binomies used by F. Ritter in 1980 and an epitype is designated for one of the recent taxa
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200020

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

ESTUDIOS CROMOSOMICOS EN ESPECIES DE HYPOCHAERIS L. (ASTERACEAE, LACTUCEAE) DE CHILE
Provedor de dados: 73
Autores: Baeza,Carlos M; Cabezas,Carolina; Terrab,Anass; Stuessy,Tod; Ruiz,Eduardo; Negritto,Maria; Urtubey,Estrella.
The genus Hypochaeris (Asteraceae, Lactuceae) contains twelve species in Europe, three in Asia, and approximately 50 in South America. In this paper, we worked with mitotic chromosomes of three different species of Hypochaeris from Chile: H. acaulis, H. incana and H. scorzonerae. The species are very different in morphology and geographic distribution. The aim of this work was to compare the chromosome morphology of these species. We found that the chromosomes are different in size and morphology in H. acaulis (smaller than 6 µm and only chromosome 3 having a secondary constriction on the short arm). In H. incana and H. scorzonerae the chromosomes are very similar in size, and chromosomes 2 (on the long arm) and 3 (on the short arm) contain secondary...
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000200011

PATRONES ESTRUCTURALES EN LAS PLANTAS VASCULARES: UNA REVISION
Provedor de dados: 73
Autores: Perreta,M. G.; Vegetti,A. C.
En las últimas décadas han surgido distintas aproximaciones al aspecto dinámico e integral del crecimiento de las plantas, que interpretan en forma variada su estructura. Estas formas de abordar el estudio de los patrones de crecimiento son: sistema de vástagos, forma de crecimiento, arquitectura vegetal, teoría de plantas clonales y tipología de las inflorescencias. En consecuencia, se ha generado una diversa terminología con distinto grado de precisión y detalle, en ciertos casos equivalente entre enfoques y en otros no. Esta revisión presenta los distintos enfoques y discute las relaciones existentes entre ellos, haciendo énfasis en el estudio del sistema de ramificación de vástagos de la planta
Tipo: Journal article
Palavras-chave: Plantas clonales; Módulo; Metámero; Sinflorescencia; Unidad arquitectural.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000100003

Evolutionary change in the germination niche between related species within Neoporteria clade (Cactaceae) is idiosyncratic to habitat type
Provedor de dados: 73
Autores: Guerrero,Pablo C.; Mardones,Daniela; Viveros,Nataly; Peña-Gómez,Francisco T.; Bustamante,Ramiro O.
ABSTRACT An appropriate germination response to environmental conditions is the first requirement for the establishment of a plant in a determined geographic area; therefore changes in the germination niche may be critical in configuring the current pattern of species distributions. Furthermore, the spread of many Neotropical groups to higher latitudes are constrained by the combination of cold and humid conditions. This raises the question whether evolutionary trends in germination niche are essential for the mechanism that allows the colonization of edge habitats characterized by humid and cold conditions. Here, we evaluated the variation of seed germination probabilities of two species of cacti (Neoporteria clade), closely related but endemic to...
Tipo: Journal article
Palavras-chave: Endemism; Ontogenetic niche; Biogeography; Mediterranean biome; Chile.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200177

Invasión de árboles alóctonos en una cuenca pre-andina de Chile central
Provedor de dados: 73
Autores: Becerra,Pablo I.
En este trabajo se describe el ensamble de especies arbóreas alóctonas presentes en la cuenca del Río San Ramón, ubicada en el borde este de la ciudad de Santiago, Chile central. En particular se documenta la flora de especies arbóreas alóctonas, el estado de invasión de cada especie (no naturalizada, naturalizada, invasora), abundancia, estructura de tamaños, se relaciona la riqueza y abundancia de especies alóctonas arbóreas con la forma de acceso a la cuenca (plantada o inmigración natural), y se caracteriza la distribución de las especies en los hábitats abióticos y tipos de parche de vegetación residente. Para ello, se llevó a cabo un censo de todos los individuos de especies arbóreas alóctonas presentes en la cuenca. Se observaron 15 especies...
Tipo: Journal article
Palavras-chave: Chile central; Especies introducidas; Especies naturalizadas; Especies exóticas; Naturalización.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000200003

Sistema reproductivo de Trichopetalum plumosum (Ruiz &amp;amp; Pav.) J.F. Macbr. (Asparagaceae), geófita endémica de Chile
Provedor de dados: 73
Autores: CUARTAS-DOMÍNGUEZ,MARCELA; ROJAS-CÉSPEDES,ALEJANDRA; JARA-ARANCIO,PAOLA; ARROYO,MARY T. K.
RESUMEN En este estudio se evaluó el sistema reproductivo de Trichopetalum plumosum (Ruiz &amp; Pav.) J.F. Macbr. (Asparagaceae), una geófita endémica de Chile. Se realizaron cinco tratamientos de polinización controlada (agamospermia, autogamia autónoma, autopolinización, polinización cruzada y natural / control). Ninguna de las flores emasculadas y sin polinizar produjo frutos, lo que indica que esta especie no es apomíctica y, por lo tanto, necesita polen para la producción de semillas. La fructificación en el tratamiento de polinización cruzada (70,0%) fue alta y similar al porcentaje alcanzado a través de la polinización natural (90,9%). A pesar del porcentaje menor en la prueba de autopolinización (43,3%), la autogamia autónoma (90,0%) se acercó a...
Tipo: Journal article
Palavras-chave: Autocompatibilidad; Autogamia autónoma; Autofecundación tardía; Geófita; Subfamilia Lomandroideae.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100073

EPIPHYTIC LICHENS OF CONGUILLÍO NATIONAL PARK, SOUTHERN CHILE
Provedor de dados: 73
Autores: Rubio,Cecilia; Saavedra,Marcelo; Cuéllar,Mauricio; Díaz,Rodrigo; Quilhot,Wanda.
One hundred and thirty eight epiphytic lichen species in 40 genera, are recorded from Conguillio National Park (38°30'-38°50' S; 71°30'-71°55' W), with predominancy of typically southern South American species. Lichen diversity is high, about 9 % of the lichen mycobiota from Chile, due mainly to species of the genera Bunodophoron, Menegazzia, Nephroma,, Pannaria, Protousnea and Pseudocyphellaria. Levels of endemism are rather high (nearly 40 %); also austral and cosmopolitan species, about 19 % and 16 % respectively, are the most representative biogeographical elements in the Park.
Tipo: Journal article
Palavras-chave: Endemism; Epiphytes; Lichens; Phorophytes; Wild protected areas.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000100008

Plasticidad fenotípica en dos poblaciones antárticas de Colobanthus quitensis (Caryophyllaceae) bajo un escenario simulado de cambio global
Provedor de dados: 73
Autores: Molina-Montenegro,Marco A; Torres-Díaz,Cristian; Carrasco-Urra,Fernando; González-Silvestre,Leticia A; Gianoli,Ernesto.
La Antártica se caracteriza por presentar condiciones ambientales extremas, lo cual limita el establecimiento de las plantas vasculares. Dentro de dichas características ambientales están las bajas temperaturas, corta estación de crecimiento y el estrés hídrico y nutricional. La baja disponibilidad hídrica ha sido sugerida como la principal limitante para el éxito de establecimiento, debido a que afecta de manera negativa las respuestas fisiológicas y reproductivas de las plantas. Colobanthus quitensis (Kunth) Bartl. (Caryophyllaceae) es una de las dos plantas vasculares nativas que habitan la Antártica Marítima y se ha demostrado que su desempeño fisiológico y reclutamiento es afectado negativamente por el estrés hídrico del suelo. La plasticidad...
Tipo: Journal article
Palavras-chave: Antártica; Esfuerzo reproductivo; Estrés hídrico; Fv / Fm; Islas Shetland.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100015

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

HALLAZGO DE ADESMIA BIJUGA PHIL. (FABACEAE) EN LA ZONA COSTERA, REGION DEL MAULE, CHILE CENTRAL
Provedor de dados: 73
Autores: Hahn,Steffen; Gómez,Persy.
This article reports the rediscovery of the specie Adesmia bijuga Phil. (Fabaceae), in the coastal zone of the Maule Region (35°29'31" S - 72°22'47" W) in central Chile. The population was found between two Pinus radiata D.Don plantations and species of the sclerophyllous shrub. Its state of conservation is unknown.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100013

Nuevos registros sobre especies En Peligro Crítico de la flora de las islas Robinson Crusoe y Santa Clara, Chile
Provedor de dados: 73
Autores: Leiva,Iván; Schiller,Ramón; Chamorro,Oscar; López,Bernardo; Araya,Guillermo; Tobar,Manuel; Angulo,Jorge; Arredondo,Danilo; Recabarren,Mascimiliano; Andaur,Alfonso.
Se describe el trabajo de los guardaparques del Archipiélago de Juan Fernández, el cual consistió en encontrar y monitorear poblaciones de las especies de flora en Estado Crítico de Conservación de las islas Robinson Crusoe y Santa Clara. Estos registros se realizaron durante tres años, 2007 a 2010. Este trabajo es parte del Plan Nacional de Conservación de Especies en Estado Crítico. Se buscaron nuevas poblaciones cambiando rutas de recorrido del parque, a las poblaciones nuevas y antiguas se les monitorearon datos de fenología, número de individuos, ubicación y estado del hábitat. Esta información enriquece el conocimiento sobre poblaciones de especies en Estado Crítico, permite aumentar el tamaño de las poblaciones existentes e implementar estrategias...
Tipo: Journal article
Palavras-chave: Conservación; Endemismo; Juan Fernández; Islas oceánicas.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200014

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

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

Nuevo recuento cromosómico para Blechnum hastatum (Blechnaceae-Pteridophyta), con un estudio de la ontogenia y tipos de leptoporangios adultos
Provedor de dados: 73
Autores: González,Graciela E; Prada,Carmen; Rolleri,Cristina H.
Se da a conocer un nuevo recuento cromosómico para Blechnum hastatum y se presenta un análisis de la ontogenia del leptosporangio en ese taxón y en B. occidentale, así como una comparación con leptosporangios adultos de otras especies y subespecies del género, como B. australe subsp. auriculatum, B. glandulosum y B. mochaenum subsp. mochaenum. En relación con la citología de B. hastatum, se contaron 33 bivalentes en diacinesis, lo que indica que se trata de un diploide con un número cromosómico 2n=66, un dato que confrma un recuento previo y ubica al taxón en la secuencia de números cromosómicos básicos conocida para el género, es decir x=33, que es el más frecuente. En el estudio de la ontogenia de los esporangios se comprobó que se forman a partir de...
Tipo: Journal article
Palavras-chave: Blechnum; Número cromosómico; Desarrollo del leptosporangio; Número de células del anillo; Sistemática.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100006

Novedades florísticas en la Reserva Nacional Roblería del Cobre de Loncha: Calceolaria philippii sp. nov. (Calceolariaceae) para la flora de Chile y ampliación de la distribución de Anemone rigida Gay (Ranunculaceae)
Provedor de dados: 73
Autores: EYZAGUIRRE PHILIPPI,MARÍA TERESA.
Calceolaria philippii Eyz. (Calceolariaceae) is described as a new species. The distribution of Anemone rigida Gay (Ranunculaceae) is extended and a new description is added. Both grow at Reserva Nacional Roblería del Cobre de Loncha on the Coastal range of central Chile.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200013

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

Inonotus crustosus (Basidiomycota, Polyporales), first record for the chilean mycobiota
Provedor de dados: 73
Autores: SANDOVAL-LEIVA,PABLO.
Se registra por primera vez para Chile la especie Inonotus crustosus (Speg.) J.E. Wright &amp;amp; J.R. Deschamps (Hymenochaetaceae, Basidiomycota). Los basidiocarpos fueron encontrados desarrollándose sobre madera de Nothofagus antarctica, en dos puntos de la Región de Aisén. Se describen e ilustran los caracteres diagnósticos y se realizan comentarios acerca de las especie.
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200011

Frugivory of Persea lingue (Lauraceae) and its effect on seed germination in southern Chile
Provedor de dados: 73
Autores: GHO-ILLANES,DAFNE; SMITH-RAMÍREZ,CECILIA; VÁSQUEZ,INAO A.; DÍAZ,IVÁN.
Frugivory is a common interaction mechanism between plants and animals in the temperate rainforest of southern South America. In this study, we examined primary dispersal and predation stages of Persea lingue (Ruiz et Pav.) Nees (Lauraceae), an endemic large-seeded tree of these forests. The main goal was to determine the identity of vertebrate seed dispersers of P. lingue, to distinguish legitimate seed dispersers, pulp consumers and seed predators, and their influence on seed germination. In order to know which birds and small mammals were feeding P. lingue seeds, we observed 20 P. lingue canopies, and live traps baited with P. lingue seeds were installed in fragment forests in south-central Chile. To determine whether birds could be legitimate...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200009

Notas taxonómicas sobre Pteridófitos chilenos
Provedor de dados: 73
Autores: RODRÍGUEZ RÍOS,ROBERTO.
En este trabajo se aclaran y rectifican varias confusiones taxonómicas en Pteridophyta chilenos: se mantiene el estatus de Adiantum sulphureum con su especie típica y con la variedad majus; Aspleniun fragile var. lomense se establece como nuevo sinónimo de Asplenium peruvianum; se establecen las diferencias entre Blechnum mochaenum y B. blechnoides y entre B. chilense y B. cordatum; se revalida Equisetum pyramidale; se considera a Polypodium masafuerae como especie endémica de Alejandro Selkirk (Archipiélago de Juan Fernández) y a P. pycnocarpum como una especie diferente de P. masafuerae, con una distribución en Perú, Bolivia, Argentina y en Chile sólo en la Región de Antofagasta.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100012

ESPEJOS DE NUESTRA EPOCA: BIODIVERSIDAD, SISTEMATICA Y EDUCACION
Provedor de dados: 73
Autores: Crisci,Jorge Víctor.
La biología ha definido la biodiversidad como la variedad y variabilidad de los seres vivos y de los ecosistemas que integran. Los componentes de la diversidad biológica se organizan en tres niveles: el de los genes, que constituyen las bases moleculares de la herencia; el de las especies, que son conjuntos de organismos afines capaces de reproducirse entre sí; y el de los ecosistemas, que son complejos funcionales formados por los organismos y el medio físico en el que habitan. La biodiversidad es el resultado de un proceso que comenzó hace 3.500 millones de años, cuando en las aguas de un mar primitivo empezaron a formarse moléculas complejas capaces de autoduplicarse. Todos los seres que hoy viven en la Tierra comparten esa misteriosa herencia...
Tipo: Journal article
Palavras-chave: Extinción; Conservación; Clasificación.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100006

Vascular flora in public spaces of Santiago, Chile
Provedor de dados: 73
Autores: FIGUEROA,JAVIER A; TEILLIER,SEBASTIÁN; GUERRERO-LEIVA,NICOLE; RAY-BOBADILLA,CRISTIAN; RIVANO,SIMONÉ; SAAVEDRA,DIEGO; CASTRO,SERGIO A.
After an extensive two-year long research effort, the results document the diversity of vascular plants that grow in the public spaces of Santiago, Chile. We analyze the taxonomic composition, life-forms and phytogeographic origin of the vascular flora of Santiago and, finally, we compare the results with those of urban areas in the Northern Hemisphere. We identified 508 species, 100 families, and 338 genera. The families that showed the greatest richness were Asteraceae and Poaceae. We found that at least 85.1% of the species are exotic. The life-forms are similarly represented, although chamaephytes and geophytes are poorly represented. We conclude that the composition of the urban flora of Santiago differs from that of most Northern Hemisphere cities,...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100011

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

Revalidación de Nothomyrcia (Myrtaceae), un género endémico del Archipiélago de Juan Fernández
Provedor de dados: 73
Autores: MURILLO-ALDANA,JOSÉ; RUIZ,EDUARDO.
Sobre la base de caracteres moleculares y morfológicos encontrados en Myrceugenia fernandeziana se revalida a Nothomyrcia, un género monoespecífico y endémico del Archipiélago de Juan Fernández.
Tipo: Journal article
Palavras-chave: Myrceugenia; Myrteae; Taxonomía.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200002

PHYLOGENETIC RELATIONSHIPS AMONG CHILEAN SPECIES OF DRIMYS (WTNTERACEAE) BASED ON ITS SEQUENCES AND INSERTION/DELETION EVENTS
Provedor de dados: 73
Autores: Ruiz,Eduardo; Toro,Oscar; Crawford,Daniel J; Stuessy,Tod F; Negritto,María A; Baeza,Carlos; Becerra,José.
Phylogenetic relationships among Chilean species of Drimys as well asD. granadensis from Central America andD. angustifolia from Brazil were reconstructed using internal transcribed spacers (ITS) of nuclear ribosomal DNA and a parsimony analysis. Our results at the family level were congruent with previous phylogenetic hypotheses. Molecular data indicate that the Juan Fernandez Island endemic D. confertifolia diverged early in the evolution of the genus, and it is not closely related to the continental species D. winteri, as might be expected on the basis of morphology and biogeography. The ITS phytogeny also provides general support for a recent distribution of species on the western side of the Andes Mountains; the only exception is D. andina, which may...
Tipo: Journal article
Palavras-chave: Drimys; Evolution; ITS; Indels; Winteraceae.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200008

HOW TO CITE BOTANICAL AUTHORS, WITH PARTICULAR REFERENCE TO THE CACTACEAE
Provedor de dados: 73
Autores: Watson,John M.
The Brummitt &amp;amp; Powell and equivalent online versions of standardised plant author names are discussed, mainly in the context of the Cactaceae, and are noted as imperative. Many surnames are shared, and several are particularly common. Each author requires a unique, uncomplicated formula in order to avoid confusion. A Working Party centred on the Royal Botanic Gardens, Kew, England, was set up to examine and resolve this problem. The importance of its results and their acceptance by the relevant international disciplines are outlined
Tipo: Journal article
Palavras-chave: Abbreviation; ICBN; IPNI.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100008

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

Nuevo hallazgo de Nardophyllum genistoides (Phil.) Gray (Asteraceae) en Chile central
Provedor de dados: 73
Autores: Muñoz-Schick,Mélica; Morales,Vanezza; Cruzat,María Eugenia; Moreira-Muñoz,Andrés.
Nardophyllum genistoides (Phil.) Gray is recollected after a century and a half, in the same Región Metropolitana, Chile, at a new locality south of the original site. It grows around 1.600 masl, in the Río Clarillo National Reserve, associated to the sclerophyllous forest. The species is very rare, because only one plant was found.
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200009

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

Notes on Gentianella tarapacana (Gilg) T.N.Ho &amp;amp; S.W.Liu (Gentianaceae), endemic to the Chilean Altiplano
Provedor de dados: 73
Autores: PFANZELT,SIMON; GARCÍA,CAROLINA.
Over a century after its first collection, Gentianella tarapacana (Gilg) T.N. Ho &amp;amp; S.W. Liu (Gentianaceae) was rediscovered at its type locality Amincha (Region ofAntofagasta, Province El Loa; 21°12'S; 68°20'W, 3850 m). The species is endemic to the Altiplano of northern Chile. It grows in wetland habitats. We designate a lectotype and provide a detailed description of the species, as well as an illustration and floristic information about its habitat at the type locality.
Tipo: Journal article
Palavras-chave: Northern Chile; Central Andes; Andean wetlands; Lectotypification.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200008

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

Evaluación de la calidad de vegetación ribereña en dos cuencas costeras del sur de Chile mediante la aplicación del índice QBR, como base para su planificación y gestión territorial
Provedor de dados: 73
Autores: CARRASCO,SEBASTIÁN; HAUENSTEIN,ENRIQUE; PEÑA-CORTÉS,FERNANDO; BERTRÁN,CARLOS; TAPIA,JAIME; VARGAS-CHACOFF,LUIS.
La vegetación ribereña comprende la zona ecotonal en la transición entre un cuerpo de agua y el ambiente terrestre contiguo, desempeñando un rol elemental en el funcionamiento de los ecosistemas acuáticos. La cobertura, estructura, y composición de la vegetación influyen de manera fundamental en el control de la entrada de energía al ecosistema acuático. Las múltiples funciones ambientales que cumplen los ecosistemas ribereños, y el flujo de servicios ecosistémicos que directa o indirectamente influyen en el bienestar de la sociedad, hacen que el conocimiento de la calidad ecológica de estas áreas sea considerado como un buen indicador ambiental, útil en la planificación y gestión del territorio, especialmente en ecosistemas costeros. Mediante la...
Tipo: Journal article
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100002

Leaf seasonal accumulation of a 47-kDa dehydrin and changes in its cryoprotective activity in Nothofagus dombeyi (Mirb.) Blume
Provedor de dados: 73
Autores: Gallardo-Cerda,Jorge; Bravo,León A; Corcuera,Luis J.
Nothofagus dombeyi (Mirb.) Blume is an evergreen tree, pioneer in habitats subject to unfavorable environmental conditions as nighttime freezing temperatures and low water content. It inhabits zones characterized by cold Winter with freezing temperature and Spring frosts reaching to -5°C. Furthermore, it has the capacity to maintain a functional photosynthetic apparatus at low temperatures. We postulated that N. dombeyi is capable to accumulate dehydrins in leaves in response to cold. Seasonal variation in dehydrins, soluble total proteins, and cryoprotective activity in vitro of protein extracts of N. dombeyi leaves were analyzed during the years 2004 and 2005. A dehydrin-like protein of 47-kDa was immunologically identified; this protein was present only...
Tipo: Journal article
Palavras-chave: Evergreen; Tree; Old acclimation; Proteins.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100002

FRAGILARIA STRIATULA LYNGBYE: UNA DIATOMEA MARINA MUY POCO CONOCIDA PARA CHILE
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola.
Aunque la especie marina Fragilaria striatula Lyngbye está ampliamente distribuída en aguas del Atlántico Norte y del Artico, es muy poco conocida para las aguas del Pacífico Sur Oriental de Chile. Sobre la base de material depositado en la Colección Diatomológica de la Universidad de Concepción, Chile, se observó y fotografió las características morfológicas de este taxon en los microscopios fotónico y electrónicos. Los especímenes estudiados fueron recolectados entre los 20°13'S y los 53°39'S, revelando una gran distribución a lo largo de la costa de Chile, especialmente como epífita de algas superiores
Tipo: Journal article
Palavras-chave: Fragilaria striatula; Morfología; Nuevas citas; Distribución; Chile.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100006

EL CARIOTIPO DE CHAETANTHERA INCANA POEPP. EX LESS. (ASTERACEAE)
Provedor de dados: 73
Autores: Baeza,Carlos M; Ruiz,Eduardo; Negritto,Maria A.
The karyotype oí Chaetanthera incana Poepp. ex Less, from Chile was examined. This species belong to the subgenus Chaetanthera. The species has 2n = 2x = 22 chromosomes, with 10m + Ism chromosomes. The reported karyotype is symmetric (Asi % = 56.0). These results were compared with Ch. chilensis and Ch. ciliata.
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000200011

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

Variación en atributos anatómicos asociados a la conducción y almacenamiento de agua, en tres poblaciones de Maihuenia poeppigii (Otto ex Pfeiff.) K. Schum. (Cactaceae) en un gradiente altitudinal
Provedor de dados: 73
Autores: CABRAL,TAÍS; QUEZADA,IVÁN M; SALDAÑA,ALFREDO.
La variabilidad en atributos anatómicos de las plantas podría estar relacionada con las condiciones del medio donde ellas se desarrollan (bajas temperaturas, estrés hídrico, corta estación de crecimiento), y esta variabilidad reflejaría la capacidad de una especie de establecerse en hábitats que difieren en la disponibilidad de estas condiciones. Maihuenia poeppigii (Otto ex Pfeiff.) K. Schum. no sólo es una de las especies de la familia Cactaceae con distribución más austral de América, sino que además presenta poblaciones creciendo en un amplio rango altitudinal (aprox. desde 15 hasta 2.600 m s.n.m.), en donde el clima varía notablemente. Este estudio evalúa la variabilidad en atributos anatómicos del tallo, relacionados con la conducción del xilema...
Tipo: Journal article
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000100002

Validación de Alstroemeria parvula Phil. (Alstroemeriaceae)
Provedor de dados: 73
Autores: Muñoz-Schick,Mélica; Morales,Vanezza; Moreira-Muñoz,Andrés.
Alstroemeria parvula Phil., is validated according to new recollections and observations in the Central Chilean Andes. It is redescribed and new localities are included confirming that it is solely protected in the private reserve and RAMSAR Site "Parque Andino Juncal".
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100014

Woodland communities in the Chilean cold-temperate zone (Baker and Pascua basins): Floristic composition and morpho-ecological transition
Provedor de dados: 73
Autores: VIDAL,OSVALDO J; BANNISTER,JAN R; SANDOVAL,VÍCTOR; PÉREZ,YESSICA; RAMÍREZ,CARLOS.
This study describes the floristic composition and morpho-ecological transition of woodlands along a climatic gradient in the southern cold temperate zone of Chilean Patagonia. A total of 256 phytosociological relevés were performed across a 150 km NE-SW transect to record vascular plant species. Classification (cluster analysis) and ordination (principal component analysis) techniques were used to segregate and examine the communities. Biodiversity indicators including richness and abundances of species natives and exotics, importance values, Raunkiaer plant life-forms, diversity indices and indicator species were calculated to describe community attributes. Beta diversity was analysed using the Jaccard index. Additionally, the current anthropogenic...
Tipo: Journal article
Palavras-chave: Biogeographical transition; Southern cold temperate zone; Anthropogenic disturbances; Pristine forests; Aysén.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200004

Revalidación de Aristolochia pearcei Phil. y notas acerca de la identidad de A. bridgesii (Klotzsch) Duch. (Aristolochiaceae)
Provedor de dados: 73
Autores: SALDIVIA PÉREZ,PATRICIO; FAÚNDEZ YANCAS,LUIS.
Mediante un estudio detallado de las descripciones originales y de los ejemplares tipo, además del análisis de nuevos materiales recolectados, se establece que Aristolochia bridgesii y A. pearcei, entidades hasta ahora consideradas sinónimos, corresponden a especies distintas, con una morfología floral notoriamente diferente y con áreas de distribución alopátricas separadas por más de 300 km en sentido latitudinal. De este modo, para Chile se reconocen, a la fecha, tres especies, A. bridgesii, A. pearcei y A. chilensis. Se entrega una completa ilustración de A. bridgesii y una clave para el género en Chile. Adicionalmente A. bridgesii y A. pearcei son lectotipificadas.
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200016

NEW RECORDS FOR THE CHILEAN ALTIPLANO CRYPTOGAMIC FLORA
Provedor de dados: 73
Autores: Larraín,Juan; Vargas,Reinaldo.
Son reportadas dos nuevas criptógamas para el altiplano de la Provincia de Parinacota en el norte de Chile: el liquen Caloplacafragillima Poelt, conocido previamente en Chile sólo de la localidad tipo en la provincia de Valparaíso, y el musgo Grimmia trinervis R.S.Wilhams, reportado anteriormente como endémico del altiplano de Perú y Bolivia.
Tipo: Journal article
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100013

Patterns of tree seedling mortality in a temperate-mediterranean transition zone forest in Chile
Provedor de dados: 73
Autores: PARADA,TERESA; LUSK,CHRISTOPHER H.
Seedling mortality in forests is the net result of an array of processes that vary spatially and temporally. We quantified emergence and mortality of seedlings at monthly intervals for two years, in a forest situated in the transition zone between the Mediterranean and temperate regions of Chile. We aimed to determine if survival of species responded differentially to seasonal water availability, to the spatial variation in light availability and to seedling density. The commonest species in the seedling bank were the Mediterranean-climate species Cryptocarya alba (61%) and the temperate-climate species Aextoxicon punctatum (29%). 279 of the 504 new seedlings that emerged during the two-year study died during the same period, corresponding to 55,4%...
Tipo: Journal article
Palavras-chave: Aextoxicon punctatum; Cryptocarya alba; Density-dependent mortality; Drought tolerance; Shade tolerance.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200015

Historia vegetal y regímenes de fuego recientes de la turbera costera de Chepu, Isla Grande de Chiloé, Chile
Provedor de dados: 73
Autores: TRONCOSO CASTRO,J. MAX; SALDAÑA,ALFREDO; RONDANELLI-REYES,MAURICIO J.
La reconstrucción de la vegetación a través del análisis polínico y los regímenes de incendio inferidos a partir de partículas de carbón son de gran importancia para el estudio de fenómenos climáticos pasados, tales como la Pequeña Edad de Hielo y el Periodo Cálido Medieval. El objetivo de este estudio es reconstruir la historia vegetacional de la turbera "Chepu", de origen antrópico, ubicada en la Isla Grande de Chiloé, Región de Los Lagos, Chile, del último milenio, a través del análisis palinológico y del análisis de alta resolución de partículas de carbón macroscópico. Para esto se realizó un sondaje estratigráfico en el centro de la turbera con el fin de proceder al análisis de polen, obtener dataciones y cuantificar las partículas de carbón...
Tipo: Journal article
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000200014

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

PRIMERA CITA DE STEPHANODISCUS AGASSIZENSIS HAKANSSON &amp;amp; KLING (BACILLARIOPHYCEAE) EN CHILE
Provedor de dados: 73
Autores: Rivera,Patricio; Cruces,Fabiola; Vila,Irma.
Se señala por primera vez para Chile a Stephanodiscus agassizensis Hakkansson &amp;amp; Kling (Stephanodiscaceae). La especie fue encontrada en una muestra proveniente del Lago Chungará (18°14'S, 69°09'W), y el material analizado está depositado en la Colección Diatomológica de la Universidad de Concepción, Chile. Fotomicrografías obtenidas en los microscopios fotónico y electrónico de barrido muestran las principales características mor-fológicas de este taxón
Tipo: Journal article
Palavras-chave: Acillariophyceae; Diatomeas; Lago Chungará; Nueva cita.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000200005

GERMINACIÓN DE ESTADOS DE RESISTENCIA DE DIATOMEAS Y DINOFLAGELADOS EN SEDIMENTOS MARINOS DE DOS ÁREAS DE SURGENCIA DE CHILE
Provedor de dados: 73
Autores: Sánchez,Gloria E; Sarno,Diana; Montresor,Marina; Siano,Raffaele; Lange,Carina B.
Con el fin de evaluar la potencial germinación de los estados de resistencia de las diatomeas y dinofiagelados preservados en sedimentos superficiales, se cultivaron bajo condiciones de laboratorio sedimentos de las bahías de Mejillones (23° S) y Concepción (36° S), Chile: Ciclo L:0 12:12 h, intensidad de luz 140 umol m²s_1, temperatura ambiente y 35,4 unidades de salinidad. Las principales especies de diatomeas presentes en los sedimentos fueron Skeletonema japonicum y esporas de Chaetoceros. Los quistes de dinofiagelados estuvieron representados por Diplopsalis, Scrippsiella, Woloszynskia y las especies Protoperidinium avellanum y P. leonis. Después de 20 días de cultivo, se registró germinación y crecimiento de S. japonicum y de varias especies de...
Tipo: Journal article
Palavras-chave: Diatomeas; Dinoflagelados; Estados de resistencia; Cultivos; Sedimentos; Chile.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200009

ESTUDIOS ANATOMICOS EN PINGUICULA CHILENSIS CLOS (LENTIBULARIACEAE)
Provedor de dados: 73
Autores: Rodríguez,Roberto; Urbina,Angélica; Valenzuela,Sofía.
Samples of Pinguicula chilensis (Lentibulariaceae) where collected from the Cordillera de Nahuelbuta in order to characterized some of its anatomical features. Leaves where processed for scanning electrom microscopy analysis in which pedunculated trichomes and secrecetory glands form 4-8 cells could be observed
Tipo: Journal article
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100009

Nueva especie de Loasa (Loasaceae) de Chile
Provedor de dados: 73
Autores: MUÑOZ-SCHICK,MÉLICA; DE TRENQUALYE,ALAIN.
Loasa mollensis Muñoz-Schick et Trenqualye is described as a new species. It is apparently narrowly endemic to a small area in the coast of the Valparaiso region, central Chile. The species has small yellow flowers and infer rounded capsules containing large seeds.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200027

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

Tasas diarias de transpiración y relaciones hídricas en especies arbóreas con distinto nivel de sombra tolerancia en un bosque templado chileno
Provedor de dados: 73
Autores: JIMÉNEZ-CASTILLO,MYLTHON; LOBOS-CATALÁN,PAULINA; AGUILERA-BETTI,ISABELLA; RIVERA,RENATO.
En general se sabe que especies pioneras que sostienen altas tasas de crecimiento, transpiración y fotosíntesis son más tolerantes a la sequía y soportan mayores temperaturas, mientras que especies sombra tolerantes lo contrario. Sin embargo, no existen antecedentes respecto a los volúmenes diarios de agua transpirada a nivel de árbol en especies del bosque templado del sur de Chile, ni antecedentes respecto a la coordinación entre los rasgos funcionales involucrados en el transporte de larga distancia. El objetivo de este estudio fue cuantificar los volúmenes diarios de agua transpirada por cuatro especies arbóreas de diferente grado de sombra tolerancia en un bosque templado lluvioso del sur de Chile, así como evaluar su relación con diferentes rasgos...
Tipo: Journal article
Palavras-chave: Transpiración; Conductividad hidráulica; Transporte de agua.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200005

Water transport and gas exchange in the non-vascular plant Dendroligotrichum dendroides &amp;#40;Brid. ex Hedw.&amp;#41;Broth. &amp;#40;Polytrichaceae, Bryophyta&amp;#41;
Provedor de dados: 73
Autores: Atala,Cristian.
Se midió la conductancia hidráulica específica (Ks) y el intercambio de gases en individuos de D. dendroides (Polytrichaceae, Musci). Ks fue más alta que en algunas coníferas y comparable con algunas angiospermas leñosas, pero la fotosíntesis (Amax) fue relativamente baja. Los resultados muestran que una planta no vascular puede alcanzar altos valores de Ks, sugiriendo un funcionamiento "vascular" similar a las traqueófitas.
Tipo: Journal article
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000100008

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

Evaluating Accuracy and Precisión in Morphologic Traits for Sexual Dimorphism in Malnutrition Human Skull: a Comparative Study
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Zavando Matamala,Daniela Alejandra; Smith,Ricardo Luiz.
One of the most important purposes of anthropological studies of human skeletons protocol is the determination of sex. Some skulls may be wrongly classified due to systemic conditions presented during the life of individuáis who affected the muscle forces that act on bones, as is the case of severe malnutrition. The purpose of this study is to analyze the effect of severe malnutrition on morphological determinan ts of sexual dimorphism classically studied in the visual analysis of the skull. 163 human skulls were analized with sex, age and cause of death known, belonging to the collection of Universidad Federal de Sao Paulo (UNIFESP). We performed visual inspection of the skull and diagnosis of sex based on size and overall architecture of the skull, an...
Tipo: Journal article
Palavras-chave: Sexual Dimorphism; Determination of sex; Severe malnutrition.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400015

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

Regeneración Ósea en Defectos Críticos Tratados con Matriz Ósea Bovina Inorgánica Aplicada con dos Diferentes Vehículos
Provedor de dados: 77
Autores: Duque Netto,Henrique; Olate,Sergio; Klüppel,Leandro; Miranda Chaves,Maria das Graças Alfonso de; Salgado,Ivone de Oliveira; Vásquez,Bélgica; Albergaria-Barbosa,Jose.
Múltiples materiales se han utilizado en la reconstrucción ósea; la matriz ósea bovina ha sido ampliamente estudiada y aun existen investigaciones que identifican su capacidad de contribuir en la formación ósea. El objetivo de esta investigación fue establecer la reparación ósea en defectos críticos de calotas de perros rellenados con matriz ósea bovina inorgánica transportada con carboxi-metil-celulosa. Se diseñó un estudio experimental en 6 perros donde se realizaron 3 defectos de 8mm de diámetro en los parietales de cada animal; el defecto fue rellenado aleatoriamente con hueso autógeno particulado (grupo I), matriz ósea bovina inorgánica con suero fisiológico al 0,9% (grupo II) y matriz ósea bovina con carboxi-metil-celulosa (grupo III). Se realizó el...
Tipo: Journal article
Palavras-chave: Hueso; Hueso bovino; Injerto óseo.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200001

Ultrastructural Effects of the Propineb on Brain of Fetuses During Rat Pregnancy
Provedor de dados: 77
Autores: Ekinci,C; Tahaoglu,A. E; Yavuz,D; Deveci,E; Aktas,A; Yilmaz,T; Yumusak,Ö; Yükselmis,O.
Propineb is a fungicide with a propylene-bis-dithiocarbamate structure. Pregnant Wistar rats were exposed to 400 ppm propineb concentrations in 5 ml distilled water, 5 days per week until the end of pregnancy. The rats were treated with propineb for 16 days and the brains of litter rats were sacrificed at first day of birth after which their brains were collected. Ultrastructural examination of the brains of the fetuses and propineb-treated pregnant females revealed a variety of histopathological effects. We suggest that mitochondrial damage may be an effective factor for neuron necrosis. These results supported the proposal that the exposure to fungicides such as propineb and to other naturally occurring compounds which inhibit mitochondrial function, may...
Tipo: Journal article
Palavras-chave: Propineb; Electron microscopy; Neonatal rats; Brain.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400054

V CONGRESO COLOMBIANO DE MORFOLOGÍA
Provedor de dados: 77
Tipo: Journal article
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100050

Variaciones Anatómicas Radiculares y Sistemas de Canales
Provedor de dados: 77
Autores: Oporto V,Gonzalo H; Fuentes F,Ramón E; Soto P,Camila C.
El desarrollo dentario resulta de una complicada interacción entre el epitelio oral y el tejido mesenquimático subyacente durante la Odontogénesis. La interacción anormal de estos tejidos podría resultar en el desarrollo y/o erupción de un diente anómalo, ectópico o con variación anatómica. El presente reporte muestra tres casos de variaciones anatómicas radiculares y al sistema de canales: un canino mandibular, un premolar mandibular y un primer premolar maxilar. El diagnóstico en los tres casos se efectuó por medio del análisis de radiografías. El canino y premolar mandibular presentaron dos raíces y dos canales, el premolar maxilar presentó tres raíces y tres conductos. Dada la presencia de una caries penetrante en este último, fue derivado a un...
Tipo: Journal article
Palavras-chave: Variación anatómica; Canal radicular; Raíz dentaria.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300046

Experiencia en Plastinación con Resina Poliéster P-4 para Cortes Anatómicos
Provedor de dados: 77
Autores: Valenzuela O,Marcos; Azocar S,Camila; Werner F,Krystel; Vega P,Eduardo; Valdés G,Fabio.
El Laboratorio de Plastinación de la Universidad de los Andes ha trabajado hasta hoy, exclusivamente la técnica en Silicona para preservar el material cadavérico mediante este tipo de conservación. Sin embargo, este método tiene algunas desventajas en cortes anatómicos finos. Se desarrolló un método de plastinación en resina poliéster, en base a la técnica ya protocolizada, adaptándolas a nuestro laboratorio, con el fin de obtener muestras con mayor resistencia y calidad, sin alterar las estructuras. Se utilizaron cortes anatómicos de segmentos distales de miembro inferior humano fijados en acetona a - 17 C y otros de encéfalo de vacuno fijados con formalina acuosa al 10% a 4 C, de un grosor que varía entre 0,4 y 0,8 cm. Se procedió a deshidratar las...
Tipo: Journal article
Palavras-chave: Preservación de tejidos; Plastinación; Resinas.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300006

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

Ultrastructure of the Myelinated and Unmyelinated Nerve Fibers of the Tongue Mucosa of Albinus Rat (Wistar) with Aging
Provedor de dados: 77
Autores: Grisolia,D. F.; Ogawa,K; Motoyama,A.A.; Kronka,M. C.; Carneiro Jr.,J. T.; Duro,C. C.; Watanabe,I.
The purpose of this paper was to study the sensory myelinated and unmyelinated nerve fibers found in the subepithelial lamina propria of tongue mucosa of aging rats. It was used the silver impregnation, transmission electron microscopy methods and morphometric measurements. The results revealed that subepithelial nerve fiber bundles of the anterior, medium and posterior regions of tongue were arise from deep muscular layer of tongue. The nerve fiber bundles were verified inside of the connective tissue of lamina propria. These nerve fibers branched several times and into the connective tissue papillae they form a single or ramified sensory nerve endings. The fungiform and vallate papillae contain numerous nerve terminals. The fine structure demonstrated...
Tipo: Journal article
Palavras-chave: Nerve fiber; Myelinated fiber; Unmyelinated fiber; Tongue mucosa; Aging rat; TEM.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400018

Variante Protrombótica C677T del Gen Metilenotetrahidrofolato Reductasa es un Biomarcador Molecular de Fallas de Implantación en Mujeres Chilenas Sometidas a Protocolos de Reproducción Asistida
Provedor de dados: 77
Autores: Guzmán,Neftalí; Jara,María José; Morales,Leslie; Sepúlveda,Carol; Guzmán,Dina; Henríquez,Hugo; García,Ricardo; Escalona,Juan; Ciuffardi,Italo.
Las fallas de implantación son consideradas una importante causa de infertilidad en mujeres sometidas a protocolos de Fecundación Asistida. Evidencia reciente sugiere que la presencia de variantes protrombóticas está asociada a diversos defectos obstétricos y falla reproductiva. Sin embargo, los resultados en diversas poblaciones son contradictorios. De acuerdo a esta evidencia, se evaluó la potencial asociación entre variantes protrombóticas y fallas de implantación en mujeres chilenas incluidas en protocolos de fecundación asistida. Un total de 180 mujeres, 80 pacientes sometidas a protocolos de reproducción asistida y 100 controles fueron incluidas en este estudio. La genotipificación molecular de variantes protrombóticas en genes candidatos fue...
Tipo: Journal article
Palavras-chave: Infertilidad; Fallas de implantación; Biomarcador.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100008

Miedo y Deshumanización: una Visión Crítica sobre la Realidad Cotidiana en el Laboratorio de Anatomía Humana
Provedor de dados: 77
Autores: Castilho,Marco Antonio Sant´Ana; Oda,Juliano Yasuo; Sant´Ana,Débora de Mello Gonçales.
La anatomía humana tiene como importante fuente de estudio al cuerpo humano. Ella utiliza cuerpos no reclamados, usualmente de indigentes, cuerpos entregados como un beneficio a la sociedad sin nada pedir nada a cambio, siendo dignos de pleno respeto. Sin embargo, preocupa que la muerte no es mirada socialmente como algo natural a la vida, llevando la convivencia en el laboratorio de anatomía humana a un estado de miedo, angustia y repulsión. Con eso se produce un mecanismo de negación, que puede generar deshumanización hacia la pieza anatómica. Ser confrontado con la muerte de otro, es lo mismo que confrontarse con nuestra propia muerte. En este contexto, los profesores y técnicos tienen una gran responsabilidad en discutir y reflejar la cuestión, de modo...
Tipo: Journal article
Palavras-chave: Anatomía humana; Muerte; Deshumanización.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300043

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

Evaluación Morfométrica de la Relación Embrio-Uterina de las Etapas Pre y Post Implantacional en Conejo (Oryctolagus cuniculus)
Provedor de dados: 77
Autores: Schencke,Carolina; Rojas,Mariana; del Sol,Mariano.
El conejo ha demostrado ser un excelente modelo de estudio de implantación. Como ovulador obligado, el tiempo de preñez se puede establecer en forma precisa. La observación morfológica de cortes de úteros de 7, 8, 9 y 10 días pos coito, permitió en este estudio reconstruir una secuencia de los eventos morfométricos que ocurren durante la implantación, en el conejo. Se utilizaron 20 conejas neozelandesas blancas adultas (Oryctolagus cuniculus), nulíparas, no gestantes. Para la cruza, se utilizaron 5 machos de probada fertilidad. Los conejos fueron obtenidos del Bioterio de la Facultad de Medicina de la Universidad de La Frontera, Temuco, Chile. Determinamos como día 0, el momento del coito, sacrificando las hembras los días 7, 8, 9 y 10 de cada cruza. Una...
Tipo: Journal article
Palavras-chave: Morfmetría; Relación embriouterina; Implantación; Conejo.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400035

Predicting Horse Skin Weight from Carcass Weight
Provedor de dados: 77
Autores: Parés i Casanova,P. M.
A study was conducted to provide information on the skin weight of Pyrenean horses and to determine whether there is a measurement to predict this based on carcass weight. Hot carcass weight (HCW) and fresh skin weight (SW) were recorded for 58 horses aged 12 months entering a Catalan commercial slaughter facility between September 2009 and June 2010. Data on the breeder, age and coat characteristics were collected and subsequently collated for each animal. Prior to analysis, horses were subdivided into sex and coat groups. Data did not differ (P &lt; 0.001) among these. The absence of differences in SW could be viewed as a reflection of limited nutritional differences between seasons. Regression procedures were used to develop equations to predict SW from...
Tipo: Journal article
Palavras-chave: Animal measurements; "Cavall Pirinenc Català"; Predictive equations.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400065

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

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

Supraorbital Notch/Foramen in Sri Lankan Skulls: Morphometry and Surgical Relevance
Provedor de dados: 77
Autores: Ilayperuma,Isurani; Nanayakkara,Ganananda; Palahapitiya,Nadeeka.
Evidence supports the ethnic and sex variation in the form and position of the supraorbital foramen. Therefore, detailed knowledge of the population specific data on biometric features of the supraorbital foramen will facilitate diagnostic, local anesthetic and surgical manipulations in the maxillo-facial region. The goal of this study was to elucidate the morphological features and precise anatomical position of the supraorbital foramen with reference to surrounding surgically encountered anatomical landmarks in an adult Sri Lankan population. A total of one hundred and eight adult dry skulls of known sex were assessed to determine the number, shape, orientation, vertical and transverse diameters of the supraorbital foramen, transverse distance from the...
Tipo: Journal article
Palavras-chave: Supraorbital notch/foramen; Position; Sri Lankan.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200009

Índices de Proporcionalidad y Composición Corporal de la Élite de Gimnasia Acrobática
Provedor de dados: 77
Autores: Taboada-Iglesias,Yaiza; Gutiérrez-Sánchez,Águeda; Vernetta,Mercedes.
El objetivo del estudio fue determinar los índices de proporcionalidad y la composición corporal de la Gimnasia Acrobática estableciéndose una diferenciación en función del rol. La muestra fue compuesta por 150 gimnastas de toda España. Se realizó el análisis y la comparación de los diferentes índices de proporcionalidad y la composición corporal en ambos grupos (ágiles y portores). El porcentaje de grasa fue significativamente (p&lt;0,001) superior en los portores (15,1% de grasa), mientras que el porcentaje óseo fue mayor en los ágiles (19,82%). En cuanto a los índices de proporcionalidad no se encontraron diferencias significativas entre ambos roles. Se aprecian diferencias significativas en relación al porcentaje de grasa y óseo entre los ágiles y los...
Tipo: Journal article
Palavras-chave: Antropometría; Composición corporal; Morfología; Gimnasia acrobática; Gimnasia.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300030

¿Músculo Digástrico o Músculo Digastricomastoideo?
Provedor de dados: 77
Autores: Carvallo,Pamela; Carvallo,Eugenia; del Sol,Mariano.
El músculo digástrico aparece mencionado en Terminología Anatomica con el código A04.2.03.006, pertenece al grupo de los músculos suprahioideos y está formado por dos vientres (latín: gaster) unidos por un tendón intermedio. El vientre anterior se origina en la fosa digástrica de la mandíbula y el vientre posterior en la incisura mastoidea del hueso temporal, ambos se insertan a través de una banda fibrosa, derivada de la capa pretraqueal de la fascia cervical profunda en el cuerpo y cuerno mayor del hueso hioideo. Los vientres anterior y posterior se originan del primer y segundo arco branquial respectivamente, siendo inervado el vientre anterior por el nervio milohioideo y el vientre posterior por el nervio facial. En su denominación el músculo...
Tipo: Journal article
Palavras-chave: Músculo Digástrico; Músculo Digastricomastoideo; Terminología Anatomica.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100058

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

Puentes de Miocardio en Corazones de Avestruz (Struthio Camelus)
Provedor de dados: 77
Autores: Troncoso,Consuelo; Henríquez Pino,Jorge.
El término puente de miocardio es atribuido al conjunto de fibras musculares cardiacas, que a veces se sobreponen a un segmento subepicárdico de una determinada rama de las arterias coronarias derecha e izquierda. Polacek (1959) fue el primero en enfocar esta entidad desde el punto de vista muscular, de aquí nace el nombre de "puente de miocardio" siendo actualmente la más usada en clínica. La presencia de estos puentes, ha sido identificada tanto en humanos como en animales y basados en ello, se estudiaron 50 corazones de avestruz, de la clase African Black, cuyo objetivo fue determinar presencia de puentes de miocardio, número, longitud y principales arterias en donde se ubican. Hubo presencia de puentes de miocardio en 20 (40,0%) de los 50 corazones...
Tipo: Journal article
Palavras-chave: Corazón; Puentes de miocardio; Avestruz.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200040

Morphometric Investigation of the Brainof West African Dwarf Sheep in Nigeria
Provedor de dados: 77
Autores: Olopade,James Olukayode; Onwuka,Silas Kalu; Balogun,Babatunde Abiodun; Oke,Bankole Olusiji.
Morphometric studies were carried out on the brains of twenty West African Dwarf (WAD) sheep using frozen unfixed specimen. The mean brain weight was 69.14g, while the mean brain length and depth were 7.48cm and 4.17cm, respectively. The mean length of the cerebrum and cerebellum were 5.08cm and 2.27cm, respectively. The relative brain weight was 0.08% while the relative weight of the head was 0.8%. There was a significant difference (p &lt; 0.05) in the weight of head, weight of brain, brain length and depth and in the relative brain weight of animals weighing 10kg and above, compared with those below this weight mark. The values of the first four parameters were higher while the fifth was lower. Animals aged one year and above, had significantly heavier...
Tipo: Journal article
Palavras-chave: Anatomy; Brain; West African dwarf sheep.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200001

La Vía Biliar Intrahepática: Clasificación Anátomo-Quirúrgica con Base Colangiográfica
Provedor de dados: 77
Autores: Mitidieri,Vicente; Ottone,Nicolás Ernesto.
Las variaciones en la constitución de la vía biliar son muy frecuentes. Su conocimiento adquiere importancia en distintos procedimientos quirúrgicos, como la colocación de un drenaje en la vía biliar o una colecistectomía. Sin embargo, el cirujano a menudo la visualiza por primera vez durante el acto quirúrgico, y debe lidiar con clasificaciones complejas para poder comprenderlas. El objetivo de este trabajo es presentar una clasificación sencilla y de rápida interpretación. Se analizaron 100 estudios colangiográficos y se realizaron 10 disecciones cadavéricas, como apoyo al estudio colangiográfico. A partir de los resultados obtenidos, se propuso la siguiente clasificación: Conducto hepático derecho "típico", cuando éste reúne la bilis de toda la porción...
Tipo: Journal article
Palavras-chave: Vía biliar intrahepática; Colangiografía; Clasificación.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400039

Effects of Preweaning Polysensorial Enrichment upon Development of the Parietal Cortical Plate of Undernourished Rats: A Stereological Study
Provedor de dados: 77
Autores: González,Héctor; Adaro,Luis; Hernández,Alejandro; Fernández,Víctor.
This investigation was undertaken in order to quantify the effects of early polysensorial enrichment on the development of cortical pyramids, located in the parietal cortex of rats simultaneously submitted to protein-energy undernutrition. A short period of stimulation during suckling significantly decreases the cellular density in the cortical plate (phylogenetic-ontogenetic evolutionary index). Results suggest that the cerebral cortex develops according to a sophisticated neuronal network, which exhibits a notable degree of structural specificity, regulated by genetic and environmental clues. The most obvious prediction is that environmental influences are probably transduced as a structural expression in the developing parietal cortical plate.
Tipo: Journal article
Palavras-chave: Environmental enrichment; Cortical gradients; Undernutrition; Parietal cortex; Stereology.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400016

The Recurrent Laryngeal Cardiac Nerve in Fetuses
Provedor de dados: 77
Autores: De Gama,B. Z; Lazarus,L; Satyapal,K. S.
The recurrent laryngeal nerve has been reported to supply cardiac branches to the cardiac plexus. A review of anatomical literature on the existing term used to describe these branches revealed that varying interpretations and descriptions exist among various authors. Therefore, this study aimed to investigate the origin and incidence of branches from the recurrent laryngeal nerves to the cardiac plexus and their connections with sympathetic cardiac nerves. The sample comprised 40 cadaveric fetuses (n=80) (gestational ages: 16-30 weeks). The recurrent laryngeal cardiac nerve was described as the cardiac branch that originated directly from the recurrent laryngeal nerve and reached the superficial or deep parts of the cardiac plexus. This study found the...
Tipo: Journal article
Palavras-chave: Recurrent laryngeal cardiac nerve; Vagus nerve; Cardiac plexus.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200005

The Arteries Root from the Aortic Arch in the Sparrowhawk (Accipiter nisus, Falconiformes: Accipitridae)
Provedor de dados: 77
Autores: Balkaya,Hulya.
This study was aimed at determining the morphology of the aortic arch in the sparrowhawk. For this purpose, arteries near the heart of six sparrowhawks were assessed. Latex injection method was applied to the three materials and barium sulphate solution was injected into the aorta for angiography in three other materials. It was observed that two major arteries arose from aortic arch in the sparrowhawk: the left brachiocephalic trunk and the right brachiocephalic trunk. These trunks were contiguous arteries but separately originated from the aorta. The brachiocephalic trunks were divided into the common carotid and subclavian arteries after their origins. First, the common carotid arteries are given off by the brachiocephalic trunks. The common carotid...
Tipo: Journal article
Palavras-chave: Sparrowhawk; Accipiter nisus; Aortic arch; Brachiocephalic trunk.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100017

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

Inclinación de Incisivos Maxilares en Sujetos con Deformidad Facial de Clase III: Opciones en Cirugía Primero
Provedor de dados: 77
Autores: Brito,Leonardo; Villa,Javier; Navarro,Pablo; Alister,Juan Pablo; Uribe,Francisca; Olate,Sergio.
El objetivo de esta investigación es determinar la inclinación de incisivos maxilares en sujetos con maloclusión de clase III. Se incluyeron 35 sujetos que presentaran deformidad facial de clase III (DF-III) para analizar la tomografía computarizada de haz cónico; las mediciones se realizaron para los cuatro incisivos maxilares identificando el plano palatino considerado entre espina nasal anterior y posterior y el eje axial dentario obtenido por la unión entre punto coronal y punto apical; los resultados mostraron angulaciones de 111,6 a 113,7 para los incisivos, lo cual permite obtener valores cercanos a la normalidad de angulación dentaria. Se concluye que los sujetos seleccionados presentan una angulación dentaria adecuada para la realización de...
Tipo: Journal article
Palavras-chave: Inclinación de incisivo; Mal oclusión clase III; Cirugía primero.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400052

Músculo Aductor Mínimo en Individuos Brasileños
Provedor de dados: 77
Autores: Gusmão,Luiz Carlos Buarque De; Brito Lima,Jacqueline Silva; Lima Santos,Marcos Sergio De; Santos,Ralmony De Alcantara; Cavalcante,Camila Carvalho.
Entre el grupo muscular que realiza la aducción de la articulación del cuadril se destaca el músculo aductor magno, cuya porción superior de la parte aductora puede constituir el músculo aductor mínimo. En la literatura hay pocas citaciones sobre este músculo, más allá de la presencia de datos divergentes entre diversos autores. De este modo, el objetivo de este estudio ha sido el de analizar el músculo aductor mínimo con relación: a sus inserciones proximal y distal, a las disposiciones de las fibras musculares y establecer la incidencia del mismo. Cincuenta miembros inferiores aislados de cadáveres adultos de ambos sexos fueron disecados. Los resultados encontrados demuestran que el músculo fue observado en dieciséis casos (32%), presentando: inserción...
Tipo: Journal article
Palavras-chave: Miembro inferior; Muslo; Anatomía.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200010

TRÍGONO ARTERIO-VENOSO DEL CORAZÓN (DE BROCQ &amp;amp; MOUCHET)
Provedor de dados: 77
Autores: de Sousa-Rodrigues,Célio Fernando; Soares de Alcântara,Fernando; Victor da Silva,Wellington Nixon; Soares de Alcântara,Fabiano; Olave,Enrique.
El trígono arterio-venoso del corazón, de Brocq &amp;amp; Mouchet, está formado por la intersección de tres vasos cardíacos, la vena cardíaca magna y las arterias circunfleja e interventricular anterior, los cuales se encuentran en la porción superior del ventrículo izquierdo, entre el cono arterial y la aurícula izquierda, en la cara pulmonar o izquierda del corazón. Con el objetivo de conocer la incidencia, conformación y contenido del trígono aludido, estudiamos 26 corazones formolizados, correspondientes a cadáveres de individuos brasileños, adultos, de ambos sexos. El trígono fue encontrado en 23 corazones (88 %). Clasificamos el trígono de acuerdo a su forma y encontramos los siguientes padrones: "abierto inferiormente" (52 %); "cerrado" (35 %);...
Tipo: Journal article
Palavras-chave: Anatomia; Corazón; Angiología.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400009

Frequency of Sella Turcica Bridge and Clinoid Enlargement in Lateral Cephalometric Plain Film Radiography from Peruvians
Provedor de dados: 77
Autores: Pérez,Iván E; Chávez,Allison K; Ponce,Darío.
The purpose for the present study was to determine the frequency of sella turcica bridge and clinoid enlargement on lateral cephalometric plain film radiography from peruvians patients who attended our radiological center and identify any possible genre or age group associations. The sella turcica from 417 lateral cephalometric plain film radiography was evaluated in order to determine the presence of sella turcica bridge (fusion between the anterior and posterior clinoid process) or clinoid enlargement related to the Sella (S) cephalometric point. The sella turcica bridge and clinoid enlargement frequency was 4.31% (n=18), and 16.3% (n=68). Cramer´s V and ETA statistics found, by separately, non significant association (p &gt; 0.05) between sella turcica...
Tipo: Journal article
Palavras-chave: Sella turcica; Radiology; Pathology; Ossification/ heterotopic; Calcinosis.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200002

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

Sperm Morphology and Natural Biomolecules from Marine Snail Telescopium telescopium: a Phylogenetic Perspective
Provedor de dados: 77
Autores: Datta,Uttam; Hembram,Manik Lal; Roy,Subhasis; Mukherjee,Prasenjit.
Biochemical analysis of the cytosol fraction isolated from the ovotestis/spermatheca glands of marine mollusc Telescopium telescopium and it's sperm microtubular structure revealed that relatively similar biomolecules like different enzymes, hormones, minerals and structures of the sperm are also exist in humans. Moreover, antiserum of the cytosol fraction was found to cross-react with the human sperm antigen indicated presence of a common sperm surface antigenicity between these two diversified species. These findings might support and / or hypothesize about the origin and diversification of the vertebrate molecules from its ancestral form (s) from the invertebrates, and basic physiological functions of these ancestral biomolecules including some of the...
Tipo: Journal article
Palavras-chave: Phylogeny; Telescopium telescopium; Biomolecules; Spermatozoa; Mammal.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100025

Morphometric and Hormonal Study of the Effect of Utrica diocia Extract on Mammary Glands in Rats
Provedor de dados: 77
Autores: Jalili,C; Salahshoor,M. R; Yousefi,D; Khazaei,M; Shabanizadeh Darehdori,A; Mokhtari,T.
Urtica diocia is a multipurpose herb in traditional medicine. Its hydroalcoholic extract (20, 50 and 100 mg/kg) administered interaperitoneally to Wistar female rats for 21 consequent days resulted in significant increase in the number of alveoli of mammary glands in doses of 20 and 50 mg/kg. Changes in serum prolactin and alveolar diameter were not significant in comparison with control group. Also, there was an increase in serum prolactin and alveolar diameter in doses of 20 and 50 mg/kg. Utrica diocia extract has positive effects on mammary glands.
Tipo: Journal article
Palavras-chave: Utrica diocia; Morphometric; Hormonal; Mammary glands; Rat.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300028

Investigation of Various Events Occurring in the Brain Tissue After Calvarial Defects in Rats
Provedor de dados: 77
Autores: Tas,Mahmut; Gok,Ertugrul; Ekinci,Cenap; Deveci,Engin; Deveci,Senay.
Bone damage and accidents, traumas can alter people's normal life, and damage the soft tissues. In this study, we aimed to investigate in calvarial defects in rats depending on the severity of cerebral contusion injury occurring in the temporal region. The rats were randomly divided into two groups: group 1 (control group), critical size cranial model with no treatment (n= 10); group 2 (14-day synthetic graft group given 7th day DEXA), critical size cranial model treated with Dexamethasone (0.05 mg/kg intramuscular injection) +Synthetic graft (n= 10) One calvarium defect of 7 mm was made in the parietal bone of each animal under general anesthesia. Calvarial defect results in dilatation of blood vessels, hemorrhage and deterioration was observed in glial...
Tipo: Journal article
Palavras-chave: Calvarial defects; Rat; Cerebrum; Immunohistochemistry.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100005

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

Sperm Morphological Studies of the West African Dwarf Buck Treated with Pumpkin Plant (Cucurbita pepo)
Provedor de dados: 77
Autores: Oyeyemi,M. O; Olukole,S. G; Esan,O.
Four healthy bucks of the West African Dwarf breed aged between 24 and 30 months were used for this study. The bucks were first used as control and later as experimental animals upon being fed daily with oiled pumpkin plant for the period of six months. The objective of the study was to investigate the effect of the pumpkin plant on the morphology of the spermatozoa of the bucks. There were significant differences (p&lt; 0.05) between the control and experimental values for both primary and secondary morphological spermatozoa abnormalities: the pyriform head has a control value of 6 (0. 42%) and post-feeding value of 0 (0%), the beat tail; 14(0.97%) and 2 (0.16%) for the control and post feeding values respectively. The curved mid piece: 17 (1.18%) and 1...
Tipo: Journal article
Palavras-chave: Pumpkin plant; Morphology; Male infertility; Spermatozoa.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100020

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

REVISIÓN ANATÓMICA E HISTOLÓGICA DEL SENO CORONARIO
Provedor de dados: 77
Autores: Barceló,Adrián; De la Fuente,Luis M.; Stertzer,Simon H.
El seno coronario (SC), tradicionalmente considerado simplemente una gran vena cardiaca, es mostrado, de acuerdo a sus características anatómicas, como una verdadera cámara cardiaca: endocardio, miocardio estriado, epicardio y un sistema de conducción específico. Fueron disecados 14 corazones humanos, utilizando aumento óptico. Imágenes de alta resolución fueron obtenidas con una cámara digital. Los datos fueron analizados con softwares especializados. Hallazgos macroscópicos: 1) Existencia de músculo cardiaco estriado formando la pared del SC sobre su circunferencia, 2) Conecciones musculares atriales-SC. 3) Fascículos musculares atrio-senocoronarios no descritos. Dos tractos musculares conectan el SC al atrio derecho (AD), (uno antero-superior o septal,...
Tipo: Journal article
Palavras-chave: Anatomía cardiaca; Seno coronario; Arritmias; Sistema de conducción.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400016

PHENYTOIN ACTION IN THE LINGUAL MUCOSA OF RAT FETUSES: MORPHOMETRIC STUDY
Provedor de dados: 77
Autores: Siéssere,Selma; Semprini,Marisa; Lopes,Ruberval A; Azoubel,Reinaldo; Sala,Miguel A; Mattos,Maria G. C; Hallak Regalo,Simone Cecílio.
Phenytoin (diphenylhydantoin, dilantin) has been the chosen anti-convulsive for the treatment of sudden disorders since the late 1930's. Several epidemiological and clinical studies in human beings showed an increase in malformations in descendants of which mothers took phenytoin during gestation, such as cranio-facial development and growth abnormalities, distal phalangeal hypoplasia, and light or moderate mental deficiency. This work had the goal to study the lingual mucosa, under histopathological and morphometric standpoints, in rat fetuses which were given an intraperitonial injection, consisting of a unique dose of phenytoin (70 milligrams/kilogram of their weight). Being that, we included the examined material in paraffin, 6 micrometers thick, and...
Tipo: Journal article
Palavras-chave: Phenytoin; Lingual mucosa; Rat; Morphometry.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000200009

Secular Trends in Body Dimensions among Young Tennis Players from 1992 to 2008
Provedor de dados: 77
Autores: Filipcic,Ales; Leskosek,Bojan; Sarabon,Nejc; Filipcic,Tjasa.
Several studies have examined both physical characteristics and fitness of children and youth. The aim of the study was first, to find the tendency of changes in selected morphological characteristics of young male and female tennis players of various ages in the periods 1992-2000-2008; and second, to find the changes in selected variables of young tennis players and to compare them with the results of boys and girls of same age from normal school population. Sample of variables included body height, body weight and body mass index (BMI). Multivariate analysis of variance revealed statistically significant differences in all main factors (group, age, gender and period) and additionally in interactions group*period, group*gender and age*gender. Univariate...
Tipo: Journal article
Palavras-chave: Young tennis players; Body weight; Body height; BMI; Secular trends.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400047

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

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

Morfometría de los Nervios Tibial y Plantares
Provedor de dados: 77
Autores: Sol,Mariano del; Vasconcellos,Adriana; Parra,Roxana; Vásquez,Bélgica.
La inervación motora de los músculos del pie y susvariaciones anatómicasson importantes para el correcto diagnóstico de las lesiones de nervios periféricos y su tratamiento posterior. Con frecuencia, el pie es afectado por accidentes y la microcirugía reparadora requiere de abundante y detallada información anatómica para efectuar con éxito sus procedimientos. La falta de información morfométrica y estereológica de los nervios destinados a la musculatura del pie, nos motivó a plantear esta investigación. Se estudiaron 5 pies de cadáveres, adultos, en los cuales se disecaron la terminación del nervio tibial y el origen de los nervios plantares, medial y lateral. A través de cortes histológicos transversales de los nervios tibial y plantares, obtuvimos...
Tipo: Journal article
Palavras-chave: Nervio tibial; Nervio plantar medial; Nervio plantar lateral; Morfometría.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000400020

Huesos Sesamoideos en la Mano Humana
Provedor de dados: 77
Autores: Olave,E; Binvignat,O; Soto,A; Cabezas,J. J.
Los huesos sesamoideos se desarrollan en el espesor de ciertos tendones o de la cápsula fibrosa que envuelve ciertas articulaciones. La prevalencia y distribución de los huesos sesamoideos en la mano es variable entre diferentes grupos poblacionales y étnicos. Basados en esta premisa realizamos un estudio para determinar su presencia en las diferentes articulaciones metacarpo-falángicas (AMF) de dos grupos de individuos. Analizamos 34 radiografías de manos de adultos, chilenos, de ambos sexos, así como 19 radiografías pertenecientes a manos de niños y adolescentes. También se estudiaron 41 radiografías de manos de adultos, Brasileños, de ambos sexos, así como 16 radiografías de niños y adolescentes. En cada observación consideramos el número de huesos...
Tipo: Journal article
Palavras-chave: Anatomía; Mano; Huesos sesamoideos.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100009

La Impulsividad y su Asociación con la Inclinación de la Frente
Provedor de dados: 77
Autores: Guerrero,David; Gabarre-Armengol,Cristina; Blas Navarro,José; Gabarre-Mir,Julián.
Avances en embriología, genética o neuroimagen, están ayudando a discernir posibles correlaciones entre estructuras del rostro, cerebro y personalidad. Una conducta que ha sido objeto de numerosas investigaciones es la impulsiva, de la que han surgido distintas conceptualizaciones con cierta controversia etiológica. En el presente trabajo estudiamos si el rostro refleja de manera objetiva el nivel de impulsividad. Para ello, se utilizó en población adulta (N=33), la dimensión Búsqueda de Novedad del Inventario de Temperamento y Carácter-Revisado de Cloninger, la Escala de Impulsividad de Barratt (BIS-11) y la Escala de Impulsividad Estado (EIE). En el rostro se midió el grado de inclinación de la frente hacia atrás, resultando una asociación positiva con...
Tipo: Journal article
Palavras-chave: Impulsividad; Rostro; Forma; Craneofacial; Córtex prefrontal.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300029

TRÍGONO FEMORAL: ¿CUÁL ES SU VERDADERO LÍMITE MEDIAL?
Provedor de dados: 77
Autores: Buarque de Gusmão,Luiz Carlos; Alves Guimarães,Vanessa; Medeiros Diégues Júnior,Inaldo de Albuquerque.
El trígono femoral es una región topográfica triangular ubicada en el tercio próximal de la cara anterior del muslo, donde transcurren los vasos femorales, nervio femoral y sus ramas. El conocimiento de sus límites es de importancia en los procedimientos invasores y en la evaluación de patologías de esta región. Referente a la determinación del lado medial de este trígono, la literatura muestra divergencias. La mayoría de los autores afirma que el límite medial del trígono está dado por el borde medial del músculo aductor largo, mientras que otros, consideran al borde lateral del referido músculo. A través de este trabajo, los autores buscan estandarizar el límite medial de este trígono. Se efectuaron exámenes en individuos adultos, vivos, de ambos sexos y...
Tipo: Journal article
Palavras-chave: Anatomía; Muslo; Miembro inferior.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000200003

Morfología de la Placenta en Recién Nacidos con Defecto Congénito
Provedor de dados: 77
Autores: Aguirre-Chacón,E. O; Levario-Carrillo,M; Reza-López,S. A; Ávila-Ochoa,R; Fierro-Murga,R; Chávez-Corral,D. V.
El objetivo del estudio fue comparar el índice de madurez placentaria y las alteraciones histopatológicas en placentas de recién nacidos/óbitos con y sin defecto congénito (DC). Se realizó un estudio tipo casos y controles. Se incluyeron n=25 casos yn=50 controles sin DC. Los casos se clasificaron de acuerdo a la presencia de DC aislado (n=17) omúltiple (n=8). Se incluyeron recién nacidos/óbitos (RN) con una edad gestacional (EG) &amp;gt; 20 semanas. Se excluyeron embarazos gemelares. Se recolectó información sobre las características clínicas del producto y de la madre, antropometría del RN y su evaluación de APGAR. Se examinó la placenta, macroscópica y microscópicamente, para determinar la presencia y extensión de alteraciones histopatológicas. Se...
Tipo: Journal article
Palavras-chave: Defecto congénito; Madurez placentaria; Placenta; Alteraciones placentarias histopatológicas.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100018

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

Multiple Abnormal Unerupted Mandibular Permanent Molar Teeth: A Case Report
Provedor de dados: 77
Autores: Karacayli,Umit; Gocmen-Mas,Nuket.
Abnormal multiply unerupted permanent molars have long received the attention of anatomists and maxillofacial surgeons besides the other developmental teeth anomalies. This paper presents a clinical case of a 23-year-old male patient who was admitted to the department of maxillofacial surgery in faculty of dentistry in Gulhane Medical School with a six month history of pain at the rest position and during chewing and also tender on his right corpus of mandible. The impaction which resulted in eruption failure and anatomical dislocation of the normally developed three mandibular molar teeth was found. It was defined facial asymmetry on his right side in extra-oral examination. Diagnosis of multiple abnormal unerupted mandibular molar teeth was confirmed by...
Tipo: Journal article
Palavras-chave: Malposed molar teeth; Permanent teeth; Uneruption; Abnormality.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100012

Protective Role of Melatonin in Mouse Spermatogenesis Induced by Sodium Arsenite
Provedor de dados: 77
Autores: Bustos-Obregón,Eduardo; Poblete,Daniel; Catriao,Roberto; Fernandes,Fábio Henrique.
Arsenic is a testicular environmental toxic. Melatonin (Me), being a potent antioxidant, may reduce the damage caused by arsenic in male fertility. The effects of daily oral exposure of Sodium Arsenite (As; 7.0 mg/kg/bw); Melatonin (Me, 10.0 mg/kg/bw); Me (10.0 mg/kg/bw) plus As (7.0 mg/kg/bw), and Negative Control (NaCl 0.9%) in male CF-1 adult mice were assessed in acute (8.3 days), chronic (33.2 days) and recovery (66,4 days) of testicular damage. We evaluated changes in testicular weight and histopathological, morphometric measurements, expression of COX-2 and Androgen Receptor (AR) antigens and lipid peroxidation levels. Treatment resulted in decreased tubular diameter and AR expression, and increased: interstitial area, luminal diameter, COX-2...
Tipo: Journal article
Palavras-chave: Mouse; Arsenic; COX-2; Androgen receptor; Oxidative stress; Melatonin.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300012

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

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

Morphological Analyses of Caseous Necrosis Correlated to CD68+ and CD8+ Cells in Biopsies of Tuberculous Pleurisy
Provedor de dados: 77
Autores: Santana,Alessandra; Loureiro,Camila; Barbosa Jr,Aryon; Arruda,Sérgio.
Tuberculosis is the most prevalent infectious disease in the world. Granuloma formation and caseous necrosis are hallmarks of M. tuberculosis infection and they represent the protective and inflammatory reactions in the infected tissues. The molecular mechanisms that mediate granuloma necrosis are still not well understood. Objectives: To immunolocalize and correlate the amounts of CD68+ macrophages and CD8+ lymphocytes to caseous necrosis extension in granulomas of tuberculous pleurisy. Methods: The study is a retrospective analysis of 30 pleural biopsies with histopathological diagnosis of chronic granulomatous pleurisy with caseous necrosis. These biopsies were classified according to necrosis intensity as minimal (N1), moderate (N2) and intense (N3)....
Tipo: Journal article
Palavras-chave: Tuberculous pleurisy; CD68+ macrophages; T CD8+ cells; Caseous necrosis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100033

TGF-ß and New Bone Formation
Provedor de dados: 77
Autores: Issa,João Paulo Mardegan; Tiossi,Rodrigo; Pitol,Dimitrius Leonardo; Mello,Amaro Sérgio da Silva.
The aim of this work is to present, by a literature review, the principal characteristics of TGF-beta, in the regulation and new bone formation
Tipo: Journal article
Palavras-chave: TGF-beta; Bone.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400017

The Levator Claviculae Muscle and Unilateral Third Head of the Sternocleidomastoid Muscle: Case Report
Provedor de dados: 77
Autores: Fazliogullari,Zeliha; Cicekcibasi,Aynur Emine; Unver Dogan,Nadire; Yilmaz,Mehmet Tugrul; Buyukmumcu,Mustafa; Ziylan,Taner.
A rare case of unilateral third head of sternocleidomastoid and an extra muscle levator claviculae were determined unilaterally in a 70-year-old male cadaver during the routine dissections. In the left neck side, it was observed that the sternocleidomastoid muscle also had a third part in addition to known sternal and clavicular heads and levator claviculae muscle which arose from the posterior tubercle of the transverse process of the 3rd cervical vertebra and attached to the posterior margin of the clavicle. An awareness of this variations may be important because of its close relationship with neurovascular structures during neck operations.
Tipo: Journal article
Palavras-chave: Levator claviculae muscle; Sternocleidomastoid muscle; Neck; Anatomic variation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300043

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

In vitro Development of Murine Embryos in presence of Campylobacter fetus
Provedor de dados: 77
Autores: Catena,M; Teruel,M; Morán,P; Chiapparrone,M; Echevarria,H; Soto,P.
Bovine campylobacteriosis caused by Campylobacter fetus is associated with reproductive losses. The knowledge about the mechanisms of bacterial pathogenesis is limited, then a murine experimental model is proposed. BALB/c females and males were used. Two-cell embryos were cultured in Ham-F10 as control group (CG). Treatment groups were constituted by the addition of Cfv 1 and 3, or Cff 2 and 5. Morulae were placed in Ham-F10 (CG); treatment groups were constituted by the addition of Cfv27, CFF (cell-free filtrate) and Brucella broth (BB). Blastocysts were cultured in MEM (CG); challenge group were constituted by the addition of Cfv 27. Differentiation, hatching, hatched, adhesion and expansion were evaluated. Results were analyzed by Chi2 test. In two-cell...
Tipo: Journal article
Palavras-chave: Campylobacteriosis; Blastocyst; Morulae; In vitro; Mouse.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400004

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

Transmission Electron Microscopy Study of the Neonatal Rat Tongue Mucosa Treated with Special Attention to the Bacteriae on the Epithelial Cell Membrane
Provedor de dados: 77
Autores: Picoli,Lara Cristina; Lopes,Ruberval A; Semprini,Marisa; Sala,Miguel Angel; Ogawa,Koichi; Watanabe,Ii-sei.
The epithelial cell surfaces of neonatal Wistar rat tongue mucosa were examined by transmission electron microscopic method. The tissues were fixed by modified Karnovksy solution and embedded in Spurr resin. Thin sections of 90 nm thickness were cut and examined in the Jeol 1010 transmission electron microscopy. It was revealed that the queratinized squamous epithelial cells of the tongue mucosa exposed to cadmium presented groupings of numerous bacteriae which are attached to the flat cell membrane surfaces. The coccus and bacillus are attached to the cell membrane in organized rows or at random, as clearly seen in the TEM images. At high magnification, the transmission electron microscopic images showed that bacteriae are attached by a fibrillar...
Tipo: Journal article
Palavras-chave: Epithelial cell; Tongue mucosa; Bacteria; Cadmium; Transmission electron microscopy.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300006

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

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

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

Olfactory Epithelium as an Infinitive Source of Neural Stem Cells for Derivation of Inner Ear Hair Cells
Provedor de dados: 77
Autores: Bahmani,Tahere; Gholami,Samira; Mostafaie,Ali; Karimi,Ebrahim; Hoseinkhani,Zohreh; Azad,Taha; Mahdizadeh,Hamid; Mansouri,Kamran.
Surgical techniques for treatment of sensory neural hearing loss (SNHL) have unpredictable outcomes and in recent years cell therapy investigated for treatment of SNHL. Olfactory epithelium proceed neurogenesis during life time and provide an easily accessible source of neural stem cells. So the aim of this study was isolating neural stem cells from olfactory epithelium of rat and differentiation of these cells into hair cells of inner ear in vitro. The epithelium tissue of olfactory mucosa of rats were removed and digested by collagenase H. The digested tissue was cultured in flasks in suspension forms to create spheres. Spheres were passaged and from passage 2 spheres selected for differentiation. At this stage cells of spheres isolated from each other...
Tipo: Journal article
Palavras-chave: Olfactory mucosa; Neural stem cells; Hair cells; Differentiation; Rat.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200004

Estereología Comparativa entre el Bazo del Cuye (Cavia porcellus) y la Rata (Rattus novergicus, Sprague Dawley)
Provedor de dados: 77
Autores: Furrianca,María Cristina; Vásquez,Bélgica; del Sol,Mariano.
El bazo es el órgano linfático periférico más grande del organismo y conocer sus aspectos morfológicos cuantitativos es importante para determinar posibles patologías. El objetivo del estudio fue determinar en dos especies: cuye (Cavia porcellus) y rata (Rattus novergicus Sprague Dawley), las características estereológicas del bazo, para obtener patrones de normalidad cuantitativos, los que servirán de base para futuros estudios morfofuncionales. Se utilizaron 5 bazos de cada especie, clínicamente sanos, obtenidos del Bioterio de la Universidad de La Frontera, Temuco, Chile. Los bazos fueron disecados y fijados en formalina tamponada al 10% y se determinó el volumen de éstos por el método de Scherle. Se obtuvieron 5 trozos por medio de Orientador los que...
Tipo: Journal article
Palavras-chave: Estereología; Bazo; Cuye; Rata.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300003

Selección Espermática en Semen Congelado/Descongelado de Equino: Evaluación de las Membranas Plasmática, Acrosomal y Potencial de Membrana Mitocondrial
Provedor de dados: 77
Autores: Cabrera,Paulina; Sánchez,Raúl; Risopatrón,Jennie.
Los procedimientos de criopreservación inducen cambios morfofuncionales en los espermatozoides. Es importante post descongelación espermática utilizar procedimientos de selección que permitan recuperar espermatozoides altamente funcionales. El objetivo del presente estudio fue comparar la eficiencia del Swim-up y Equipure® en la selección de espermatozoides funcionales en semen descongelado de equino. Semen de 4 potros reproductores Criollos Chilenos (A, B, C y D), fueron descongelados separadamente y procesados (n=15) por: I.- Swim-up (SU) y II.- Equipure® (EQ). Post descongelación se determinó por citometría de flujo la viabilidad e integridad de membrana plasmática (SYBR-14/PI), potencial de membrana mitocondrial (YDm; JC-1), integridad de la membrana...
Tipo: Journal article
Palavras-chave: Equino; Espermatozoide; Swim-up; Equipure®.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200057

Quiste Broncogénico de Localización Poco Habitual: Reporte de 2 Casos y Revisión de la Literatura
Provedor de dados: 77
Autores: Bellolio J,Enrique; Tapia,Oscar; Guzman,Pablo; Villaseca H,Miguel.
El quiste broncogénico es un remanente del desarrollo de traquea y bronquios. Alteraciones en la migración de células durante el desarrollo, permite que estos grupos originen quistes revestidos por epitelio respiratorio. La ubicación más habitual es la intratoráxica, dentro de ella, la intrapulmonar es la más frecuente, seguida de la mediastínica. El diagnóstico definitivo se establece mediante la biopsia diferida. Es una patología poco frecuente y las presentaciones extra torácicas son muy infrecuentes, por lo que compartimos dos casos, uno de ubicación sublingual y otro de ubicación subcutánea en zona escapular.
Tipo: Journal article
Palavras-chave: Quiste broncogénico; Quiste bronquial; Quiste congénito.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400040

Histopathologicaltudies on the Effects of the Ethanolic Extract of the fruits of Garcinia kola on Selected Organs of the Dog
Provedor de dados: 77
Autores: Nottidge,H. O; Omobowale,T. O; Taiwo,V. O; Omotoso,M. A.
The ethanolic extract of Garcinia kola was administered to dogs to investígate the possible effects on selected organs of the dog. Two doses of the extract (500mg/Kg and lOOOmg/Kg) were daily administered to the test animals for a period of 6 weeks. A dose related response was observed in the severity of histopathological changes observed in the testes, liver, kidney and small intestine of animals in the test groups. Despite the reported potentially beneficial effects of Garcinia kola, its use as a medicinal plant should be with great caution.
Tipo: Journal article
Palavras-chave: Garcinia kola; Dog; Histopathological effects.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400044

The Human Body Known Through the Renovated Museum of Anatomy From the Faculty of Dentistry of Ribeirão Preto
Provedor de dados: 77
Autores: Rodrigues,Giovani Antônio; Ferreira,Pedro Franco; Morando,Bianca Carrilho; Issa,João Paulo Mardegan; Iyomasa,Mamie Mizusaki.
The present work aimed to preserve anatomical specimens to improve the quality of education, prepare supporting materials, and present lectures on the anatomy of the nervous system for public school students. Anatomical specimens related to the nervous system were photographed and named, and acrylic containers filled with formaldehyde were made for the accommodation of these specimens. After research on the subject a handbook and a banner were prepared, enriching the collections of the museum along with the anatomical specimens, in addition to the lecture and video available on "iptv.usp.br ". Meetings between the students, the teachers involved, and the members of the Secretariat of Education of Ribeirao Preto defined schools, dates, times, and duration...
Tipo: Journal article
Palavras-chave: Neuroanatomy; Museum; Learning; Culture and extension.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300043

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

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

Tejido Tiroideo y Láser Infrarrojo: Un Estudio Morfométrico
Provedor de dados: 77
Autores: Cornejo,Ricardo; Jaramillo,Roberto; Garrido,Orlando; Vergara,Luis.
La glándula tiroides posee gran importancia debido a la síntesis y secreción de hormonas, las cuales desempeñan funciones fundamentales para la mantención de la fisiología animal. En este contexto, el objetivo del presente trabajo consistió en determinar parámetros morfométricos de estructuras tiroideas sometidas a estimulaciones con láser infrarrojo (LIR). Para ello, 10 ratas Sprague Dawley de 3 meses de vida y peso aproximado de 200 g, fueron divididas en dos grupos de 5 animales cada uno: grupo control y grupo experimental. Estos últimos recibieron estimulaciones infrarrojas en la tiroides con dosis de 16 J/cm2 durante 15 días seguidos. Una vez sacrificadas las ratas, se extrajeron las glándulas tiroides las que fueron procesadas para microscopía óptica...
Tipo: Journal article
Palavras-chave: Tiroides; Morfometría; Láser infrarrojo.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300044

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

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

Teratogenic Effect of Ethylene Glycol-Methyl Cellosolve Mixture in Rats.: I. Reproductive Damage
Provedor de dados: 77
Autores: Arteaga-Martínez,Manuel; García-Peláez,Isabel; Aguirre-Luna,Oswaldo M; Saavedra-Ontiveros,Dolores.
We investigated the reproductive damage and teratogenic effect of an ethylene glycol-methyl cellosolve mixture on gestating Wistar rats, which received a daily intraperitoneal dose of different concentration of the mixture on day 8 of gestation until day 20. In rats treated with the mixture the number of live fetuses decreased and reabsorptions increased with increasing concentrations of the mixture, as well as the number of abnormal fetuses. We conclude that the ethylene glycol-methyl cellosolve mixture possesses a higher teratogenic potential than each of its constituents separately, producing reproductive damage, external fetal abnormalities, growth delay, and increased fetal death.
Tipo: Journal article
Palavras-chave: Ethylene glycol; Glycol ethers; Methyl cellosolve; Rat fetuses; Teratogenesis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400016

Variations in The Vascular Supply of Pancreas and Transverse Colon: A Case Report
Provedor de dados: 77
Autores: Silva Júnior,L. M; Alexandre,M; Gonçalves,L; Silva,F. S; Caetano,A. G.
During anatomical dissection of the abdominal cavity of an adult male corpse, a changing pattern of vascular supply of pancreas and of the transverse colon was observed. The inferior pancreatic artery and the middle colic artery arose from a common trunk of the superior mesenteric artery. Moreover, the lienal artery did not direct a dorsal branch to the neck of the pancreas, but rather sent two greater pancreatic arteries (proximal and distal) to the body of the gland and one caudal artery to the terminal portion of the pancreas. We also observed a large communicating branch between the proximal portion of the middle colic artery and the ascending branch of the left colic artery, previously described as artery of Moskowitz. Based on these data, clinical...
Tipo: Journal article
Palavras-chave: Anatomic variation; Blood supply; Pancreas; Large intestine.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100032

Pulpa Dentaria Sana vs. Pulpitis Reversible: Caracterización Estereológica de Fibroblastos
Provedor de dados: 77
Autores: Trujillo,Erick; Morales,Rolando; Roa,Ignacio.
La reacción y reparación de la dentina depende del número de células presentes en la pulpa, dentro de éstas fibroblastos. Los métodos diseñados para obtener una estimación fiable de la cantidad de elementos celulares de la pulpa han sido subjetivos y sesgados, sobre todo al evaluar los cambios cuantitativos y potencial capacidad reparadora en presencia de caries. El objetivo fue estimar y comparar cuantitativamente las densidades de número, volumen y superficie de fibroblastos en pulpas sanas y con diagnóstico de pulpitis reversible producto de caries en dientes humanos jóvenes. Se utilizaron dientes premolares humanos obtenidos de exodoncias, divididos en un grupo sano y cariado, los cuales fueron fijados y posteriormente descalcificados con ácido nítrico...
Tipo: Journal article
Palavras-chave: Estereología; Pulpa dentaria; Fibroblastos.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300021

Homoplasies, Consistency Index and the Complexity of Morphological Evolution: Catfishes as a Case Study for General Discussions on Phylogeny and Macroevolution
Provedor de dados: 77
Autores: Diogo,Rui.
Catfishes constitute a highly diversified, cosmopolitan group that represents about one third of all freshwater fishes and is one of the most diverse Vertebrate taxa. The detailed study of the Siluriformes can, thus, provide useful data, and illustrative examples, for broader discussions on general phylogeny and macroevolution. In this short note I briefly expose how the study of this remarkably diverse group of fishes reveals an example of highly homoplasic, complex 'mosaic' morphological evolution
Tipo: Journal article
Palavras-chave: Catfishes; Homoplasies; Morphological macroevolution; Phylogeny; Siluriformes; Teleostei.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400024

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

Metallothionein: An Overview on its Metal Homeostatic Regulation in Mammals
Provedor de dados: 77
Autores: Sakulsak,Natthiya.
Metallothionein (MT) is a ubiquitous protein with a low molecular weight of 6-7 kDa weight and it was first identified in the kidney cortex of equines as a cadmium (Cd)-binding protein responsible for the natural accumulation of Cd in the tissue. The mammalian MT contains 61 to 68 amino acid residues, in which 18 to 23 cysteine residues are present. The expression of MT starts by binding of metal transcription factor-1 (MTF-1) to the regulative region of MT gene called metal responsive elements (MREs). The induction of MT through the MREs region can be initiated by several metal ions such as zinc (Zn), copper (Cu) and Cd. However, Zn is the only heavy metal which can reversibly and directly activate the DNA-binding activity of MTF-1. In mammals four types...
Tipo: Journal article
Palavras-chave: Metallothionein; Cadmium; Zinc.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300039

Morphometry of Pedicle and Vertebral Body in a Mexican Population by CT and Fluroscopy
Provedor de dados: 77
Autores: Urrutia Vega,Edgar; Elizondo Omaña,Rodrigo E; De la Garza Castro,Oscar; Guzmán López,Santos.
It is necessary to have precise anatomical knowledge of lumbar pedicles for the safe placement of screws. There are not reports about the morphometry of lumbar pedicles in a Mexican population exist. A descriptive, observational and cross-sectional study was done in 60 cadavers from the dissection lab of the Human Anatomy Department of the Medicine School. The aim of the study was to quantify the morphometric characteristics of the pedicles of the lumbar spine in a Mexican population. A total of 60 cadavers were evaluated by fluoroscopy and CT from L1 to L5, in the age range of 40 to 78 years. Each vertebral pedicle was measured in the axial, sagittal and coronal planes. The measurements included the minimum pedicle width, the pedicle angle, the distance...
Tipo: Journal article
Palavras-chave: Pedicles; Vertebral body; Morphometry; Intrapedicular screws; Lumbar fusion surgery.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400052

Relaciones Biométricas del Anillo Atrioventricular Izquierdo y las Arterias Coronarias en el Hombre
Provedor de dados: 77
Autores: Pradenas,Ilse; Henriquez,Jorge; Olave,Enrique.
La relación de las arterias coronarias con los anillos atrioventriculares se torna importante en casos de reemplazo o plastía de la valva correspondiente. La proximidad de la rama circunfleja de la arteria coronaria izquierda al anillo atrioventricular izquierdo, a nivel de la comisura anterior, ha traído complicaciones quirúrgicas, en algunos casos con resultados fatales. Basado en lo anterior, estudiamos las relaciones biométricas entre las arterias coronarias y el anillo atrioventricular izquierdo. Utilizamos 58 corazones de individuos chilenos, 28 fijados en formaldehído al 10 % y 30 frescos de individuos brasileños, de edades comprendidas entre 18 y 84 años, de ambos sexos y sin aparente cirugía cardíaca. Disecamos la región de ambos surcos...
Tipo: Journal article
Palavras-chave: Anatomía; Corazón; Arteria coronaria; Anillo atrioventricular izquierdo; Cirugía valvar.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300010

Unilateral and Ipsilateral Strength Asymmetries in Elite Youth Soccer Players With Respect to Muscle Group and Limb Dominance
Provedor de dados: 77
Autores: Maly,Tomas; Zahalka,Frantisek; Mala,Lucia.
The purpose of study was to identify the presence of strength asymmetries (SA) in young elite soccer players in relation to muscle group (knee extensors (KE) and flexors (KF)) and limb preference (dominant vs. non-dominant limb). Forty-one U16 national team soccer players (mean age 15.7±0.3 years, body height 177.9±6.6 cm, body weight 68.2±7.9 kg) participated in this study. Assessments were performed on a Cybex Humac Norm isokinetic dynamometer in concentric contraction. We noted the degree of SAs in the bilateral ratio of quadriceps and hamstrings and in the ipsilateral ratio of the dominant (DL) and non-dominant (NL) legs. Bilateral deficits of KFs were higher (9.02­12.61 %) than those of KFs (6.32­7.15 %). The percentage of SA (&amp;gt;10 %) in knee...
Tipo: Journal article
Palavras-chave: Muscular strength; Strength Asymmetries; Isokinetic testing; Soccer; Injury prevention.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400027

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

Nervios Digitales Palmares Comunes del Ramo Superficial del Nervio Ulnar y Nervios Digitales Plantares Comunes del Ramo Superficial del Nervio Plantar Lateral: Un Error Anatómico en Terminologia Anatomica
Provedor de dados: 77
Autores: del Sol,Mariano; Vásquez,Bélgica.
Terminologia Anatomica contempla la existencia de nervios digitales palmares comunes del ramo superficial del nervio ulnar y nervios digitales plantares comunes del ramo superficial del nervio plantar lateral. De acuerdo a la mayoría de los textos clásicos y estudios anatómicos de las regiones de la palma de la mano y de la planta del pie, solo existiría un nervio digital palmar común (IV) originado del ramo superficial del nervio ulnar y un nervio digital plantar común (IV) con origen en el ramo superficial del nervio plantar lateral. Realizamos una revisión anatómica de la inervación cutánea de la palma de la mano observando el comportamiento de los nervios mediano y ulnar y de la planta del pie a través de los nervios plantares medial y lateral,...
Tipo: Journal article
Palavras-chave: Nervio ulnar; Nervios digitales palmares; Nervio plantar lateral; Nervios digitales plantares.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300050

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 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 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

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

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

Study of Sinoatrial Nodal Artery Dominance in Brazilian Human Hearts
Provedor de dados: 77
Autores: Bezerra,Frank Silva; Nagato,Akinori Cardoso; Vieira,Carolina Lourdes Julião; Reis,Liana Antonicci; Novais,Luciene; Valença,Samuel Santos.
Thirty hearts from adult individuals, 15 from male individuals and 15 female individuals, from the Anatomy Institute of Severino Sombra University were used. After a paramedian incision in the sternocostal joint, a careful dissection was performed in order to expose and identify the sinoatrial nodal artery (SAN), a right or left coronary artery branch. The domain was registered as right, if the right coronary branch irrigated the SAN. The same was listed for the left coronary artery. In addition, cases were both arteries irrigated SAN also were listed. All data, including hearts mass according to gender definition, were compared with previous reports through the variance analysis test (One-way ANOVA) and the post-hoc test of Newman-Keuls with p 0.05....
Tipo: Journal article
Palavras-chave: Heart; Sinoatrial nodal artery; Arterial dominance.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100008

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

Morfometría de los Nervios Isquiático, Tibial y Fibular Común en el Hombre
Provedor de dados: 77
Autores: del Sol,Mariano; Olave,Enrique; Contreras,Jaime; Vásquez,Bélgica.
El nervio isquiático, el más extenso del cuerpo humano, emerge de la pelvis por el foramen isquiático mayor, dividiéndose proximal a la articulación de la rodilla en los nervios tibial y fibular común. Con frecuencia, estos nervios son afectados por accidentes, por tanto, la microcirugía reparadora requiere de detallada información anatómica para efectuar con éxito sus procedimientos. El nervio isquiático puede ser lesionado por heridas penetrantes, en las luxaciones posteriores de la articulación coxal y por inyecciones intramusculares mal aplicadas en la región glútea, siendo rara la lesión del nervio tibial por estar situado profundamente protegido. En cambio, la lesión del nervio fibular común, es frecuente debido a su posición superficial, quedando...
Tipo: Journal article
Palavras-chave: Nervio isquiático; Nervio tibial; Nervio fibular común; Morfometría.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200008

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

El Anatomista Español que se Atrevió a Rectificar a Vesalio: Juan Valverde de Amusco
Provedor de dados: 77
Autores: Moreno-Egea,Alfredo.
Las aportaciones científicas de los anatomistas españoles del renacimiento son muy poco conocidas a nivel internacional, sin embargo, fueron clave para comprender la anatomía actual, en especial la obra anatómica de Juan Valverde de Amusco, "el Vesalio español". Este trabajo tiene como objetivo mostrar que su obra anatómica es original, y que supuso un hito histórico para la ciencia y la lengua castellana. Frente a la Fábrica de Vesalio, escrita en latín académico y difícil de comprender, se sitúa la obra de Valverde como el primer manual moderno de anatomía, escrita en castellano, preciso y sencillo, con una difusión por Europa muy superior, que facilitó el conocimiento profesional a médicos, cirujanos y artistas. La obra de Juan Valverde debe...
Tipo: Journal article
Palavras-chave: Anatomía; Historia; Vesalio; Juan Valverde.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300032

Estudio Comparativo entre Soluciones Conservadoras con y sin Formol en Placenta Humana
Provedor de dados: 77
Autores: Wolff,Daniel; Villa,Pablo; Neirreitter,Alejandra; Ruibal,Cecilia; Ugon,Gustavo Armand; Salgado,Guillermo; Cantín,Mario.
Las técnicas de fijación y conservación anatómica son realizadas habitualmente con soluciones que contienen formol, dado su bajo costo. Estas tienen varias desventajas como el olor irritante, rigidez, cambios de coloración de las estructuras, así como toxicidad con potencial cancerígeno, teratogénico y mutagénico para quien lo manipula. Por esto, es deseable utilizar soluciones sin formol. El objetivo de este trabajo fue comparar 2 métodos de conservación cadavérica, uno con formol (solución de Montevideo) y otro sin formol (método de Prives) utilizando la placenta humana como órgano experimental, evaluando sus parámetros macroscópicos. Se utilizaron 46 placentas humanas de partos normales y gestación a término. Las placentas fueron separadas en dos grupos...
Tipo: Journal article
Palavras-chave: Placenta; Técnicas anatómicas; Solución fijadora; Formol; Libre de formol.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200013

Study of the Nuclear Volume of Testicular Cells of Rats Receiving Ofloxacin Through Lactation
Provedor de dados: 77
Autores: Paschoal,Vánia Del'Arco; Rossit,Andrea Batista; Bizutti,Luiz Onivaldo; Monteiro,Rodrigo; Padovani Junior,Joao Armando; Azoubel,Reinaldo.
Ofloxacin presents an ample spectrum of antimicrobial action, including combating Mycobacterium leprae, and is currently employed as a substitute when the use of rifampicin is impossible. The objective of this work was to study alterations in testicular cell nuclei of suckling rats, whose dams were submitted to oral application of ofloxacin, and respective control groups. The method utilized was morphometry by the karyometric technique. The main structures observed in histological preparations of the testicles were interstitial cells, spermatogonias, and sustentacular cells. 10 Wistar rats were utilized, four treated and five controls, in the period of the first 25 days of life, whose dams received ofloxacin 12 mg/ Kg of body weight / day orally, before...
Tipo: Journal article
Palavras-chave: Quinolones; Ofloxacin; Morphology; Karyometry; Nuclear volume; Testicle; Lactation; Sustentacular cells; Rat.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300022

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

Prevalencia de Agenesia Dental en Niños con Dentición Mixta de las Clínicas Odontológicas Docente Asistencial de la Universidad de La Frontera
Provedor de dados: 77
Autores: Pineda,Patricia; Fuentes,Ramón; Sanhueza,Antonio.
El objetivo de este estudio (corte transversal y descriptivo) es determinar la prevalencia de agenesia (hipodoncia) dental en niños con dentición mixta que asisten a las Clínicas Odontológicas Docente Asistencial de La Universidad de La Frontera, durante el año 2009. Se examinaron 307 niños entre 6 y 11 años, que cumplían con los criterios de inclusión. La prevalencia de agenesia en la población estudiada fue de 4.2% (13/307), resultando más afectados los individuos de sexo femenino 5,9% (9/153). De acuerdo al orden de frecuencia, el diente más afectado por agenesia fue el segundo premolar inferior, con un valor de 4,2% (13/307). Le siguen, el segundo premolar superior, cuyo valor fue de 3,3% (10/307), 1,3% (4/307) del incisivo lateral inferior y 0,33%...
Tipo: Journal article
Palavras-chave: Anomalías dentarias; Agenesias; Oligodoncia; Hipodoncia; Hiperdoncia; Prevalencia.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400002

Electroterapia para la Regeneración Ósea de Implantes Dentales
Provedor de dados: 77
Autores: Buzzá,Edmur; Olate,Sergio; Pozzer,Leandro; Albergaria-Barbosa,José Ricardode.
La oseointegración se ha optimizado favorablemente en los últimos años y tecnologías variadas se han aplicado para mejorar esta condición. El objetivo de esta investigación fue conocer la relación entre la aplicación de cargas eléctricas y su capacidad de mejorar la oseointegración en un modelo animal. 16 conejos de raza New Zealand, de 3 a 6 meses, fueron divididos en dos grupos. En ambos se realizo la instalación de 4 implantes de titanio especialmente diseñados para esta investigación, dos en cada tibia, utilizando técnicas de compresión. En el grupo experimental se aplico cargas eléctricas a nivel de extremidades inferiores durante 30 minutos por día mientras duraba el tiempo previo a la eutanasia de los animales realizada finalmente a los 21 y 42...
Tipo: Journal article
Palavras-chave: Oseointegración; Regeneración ósea; Implante dental.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200050

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

MORPHOMETRIC STUDY OF MENISC OF THE KNEE JOINT
Provedor de dados: 77
Autores: da Silva Almeida,Katiúcia Samara; Arruda de Moraes,Silvia Regina; Tashiro,Tetsuo; Neves,Elizabeth da Silveira; Toscano,Ana Elisa; Rocha de Abreu,Roseanne Maria.
We analyzed the meniscus morphometrics aspects of the knee joint as such: extern circunference tickness, the breadth, the area and distance between anterior and posterior horns, the tibial plateau correspondent area, meniscus area/tibial plateau report, check the Wrisberg's ligament length. There were analyzed 44 meniscus of the 22 knees adults men corpses. The tickness and breadth morphometrics variables were evaluated in three different points: anterior medium and posterior third part and compared values between medial and lateral compartments. In the medial meniscus weren't meaningful difference between anterior, medium and posterior third part thickness, while medium third part lateral meniscus showed such as larger thickness. When analyzed the...
Tipo: Journal article
Palavras-chave: Morphometry; Knee; Meniscus.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000300001

Variable Morphology of the Hyoid Bone in Anatolian Population: Clinical Implications - A Cadaveric Study
Provedor de dados: 77
Autores: Kopuz,Cem; Ortug,Gürsel.
The variations of the hyoid bone has a great significance for surgical procedures of neck region, and in forensic medicine for evidence of strangulation or hanging, which causes fractures. The aim of this study was to investigate the morphological and morphometrical variations of the hyoid bone in Anatolian population. A total of 60 adult larynx specimens (46 male, 14 female) were dissected to identify morphological and morphometrical variations of hyoid. The infrahyoid muscles and thyrohyoid membrane were cut and ligamentous structures of bone were removed. The variations of shape of the hyoid were classified into six types: A (U-shaped) hyoid bone observed in 31.7 % (19 bones), a horseshoe-H-type in 10 % (6 bones), a B-type hyoid in 31.7 % (19 bones), a...
Tipo: Journal article
Palavras-chave: Hyoid bone; Shape; Variation; Morphometry; Embryology.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400036

Morphometric Parameters of the Human Adult Kidney: An Anatomical Study
Provedor de dados: 77
Autores: Murlimanju,B.V; Kumar,Buraje Madhuri; Kumar,Naveen; Prashanth,K.U; Rao,Chitra Prakash; Guru,Anitha; Prabhu,Latha V; Kumar,Chettiar Ganesh.
The purpose of this study was to determine the anatomic parameters of the kidney in adults. The Renal lengths, width at superior and inferior poles, thickness at the superior and inferior poles were measured in 151 adult cadaver kidneys. A digital vernier caliper was used for performing the measurements. The data were statistically analyzed. The mean renal length was 8.9 ± 0.9 cm on the right side and 9.1 ± 0.9 cm on the left side. The mean width of the superior pole of the right kidney was 4.9 ± 0.6 cm and the left kidney was 5 ± 0.7 cm. The width of inferior pole of the right and left kidneys were 4.8 ± 0.6 cm and 4.5 ± 0.7 cm respectively. The mean thickness of the superior pole of the right kidney was 3 ± 0.4 cm and left kidney was 3.2 ± 0.5 cm. The...
Tipo: Journal article
Palavras-chave: Inferior pole; Kidney; Length; Morphometry; Superior pole.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200045

Teratoma Quístico Hipermaduro del Ovario: Observación de una Mano Rudimentaria
Provedor de dados: 77
Autores: Benítez Cáceres,Hugo; Parra Lara,Roxana; Elorza Dabed,Javier.
Los teratomas quísticos maduros, también llamados quistes dermoides, representan un 95% de los tumores derivados de células. El hallazgo de teratomas con alto de grado desarrollo es ocasional, siendo extremadamente raros los casos con desarrollo de órganos o porciones anatómicas completas. Reportamos en este trabajo un caso de teratoma quístico maduro del ovario con alto grado de diferenciación, en el que observamos el desarrollo de una mano rudimentaria. Se reportan los hallazgos anatomopatógicos en la biopsia de quiste ovárico de una paciente de 25 años. Se realizaron técnicas histológicas (azul alcian, tricrómico de Masson, Van Gieson, orceína para fibras elásticas) e inmunohistoquímica (S-100). La pared del quiste se encontró revestida internamente por...
Tipo: Journal article
Palavras-chave: Teratoma; Tumor ovárico.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000100013

Unilateral Double Axillary and Double Brachial Arteries: Embryological Basis and Clinical Implications
Provedor de dados: 77
Autores: Jayakumari,S; Rath,Gayatri; Arora,Jyoti.
This report presents double axillary and double brachial arteries on the right side of an adult male cadaver. In this case, the right axillary artery bifurcated into axillary artery I and axillary artery II posterior to the pectoralis minor muscle. Both the axillary arteries with their branches traversed upto lower border of teres major muscle and continued further as seperate entities into the cubital fossa as brachial artery I and brachial artery II respectively. The axillary artery I which continued as brachial artery I was superficial and tortuous in its course, while the axillary artery II was slender and deeply situated. The thoraco-acromial, lateral thoracic and subscapular arteries took origin from axillary artery I. The superior thoracic artery...
Tipo: Journal article
Palavras-chave: Axillary artery; Brachial artery; Anatomical variation.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400027

¿Existe Alteración de los Mecanismos de Degradación del Colágeno de la Matriz Extracelular Manifestada en la Expresión de MMP2 y TIMP2 en Pacientes con Hernia Inguinal Primaria?
Provedor de dados: 77
Autores: Molina,Víctor; Manterola,Carlos.
Existe evidencia de asociación de alteraciones de la matriz colágena en sujetos con hernia inguinal (HI). El objetivo de este estudio fue determinar la existencia de alteraciones en la expresión de MMP2 y TIMP2 en sujetos con HI primaria. Estudio de casos y controles, realizado en los Servicios de Cirugía y de Urgencias del Hospital Regional de Temuco entre 2009-2010. Se incluyeron pacientes con HI primaria mayores de 15 años, sin restricción de género (casos), e Individuos sin hernias, mayores de 15 años, intervenidos por apendicitis aguda (controles). Se excluyeron portadores de condiciones predisponentes al desarrollo de hernias de pared abdominal. La variable resultado fue determinación de MMP2 y TIMP2 mediante inmunohitoquímica (IHQ). Otras variables...
Tipo: Journal article
Palavras-chave: Hernia; Hernia inguinal; Matriz colágena; Colágeno; Metaloproteinasas; Inmunohitoquímica; Estudio de casos y controles.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200054

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

Hematoma Disecante de la Parte Torácica de la Aorta: Estudio Anatomopatológico de Siete Casos de Autopsias
Provedor de dados: 77
Autores: Guerini,Julio César; Storniolo Squintone,Andrea; Borchert,Alba; Fonseca,Ismael Bernardo; Avila,Rodolfo Esteban; Spitale,Luis Santos.
El hematoma disecante de aorta (HDA) se define como la disección de la pared aórtica por la sangre, con formación de una nueva luz. Es la patología letal de la aorta más frecuentemente diagnosticada y ocurre con una frecuencia tres veces mayor que la rotura del aneurisma de la aorta abdominal. Nuestro objetivo es presentar siete casos de HDA observados en autopsias, describir los hallazgos anatomopatológicos y comentar la literatura. Los casos estudiados corresponden al Servicio de Patología del Instituto de Medicina Forense de Córdoba, Argentina. Los tejidos fueron fijados en formol al 10%, incluidos en parafina y coloreados con hematoxilina-eosina, tricrómico de Masson y PAS (Peryodic Acid Schiff). De los siete casos presentados cuatro correspondieron a...
Tipo: Journal article
Palavras-chave: Hematoma; Disección; Aorta; Hipertensión arterial.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400044

Morphological and Morphometric Study of the Mental Foramen on the M-CP-18 Jiachenjiang Point
Provedor de dados: 77
Autores: Oliveira Junior,E. M; Araújo,A. L. D; Da Silva,C. M. F; Sousa-Rodrigues,C. F; Lima,F. J. C.
The purpose of this work was to study the morphology and morphometry of the mental foramen (MF), as well as to evaluate its morphological configuration; in addition to taking measures of its localization using as a parameter the distances of the foramen to the inferior border of the mandible and at the alveolar ridge. 80 dry mandibles were analyzed using the test of Qui-square and T test, with 5% of significance. Its average distance, on the right side, at the inferior edge of the mandible (IEM) was of 12.96(±1 .57) mm and of the alveolar ridge (AR) was of 12.82(±3.4) mm. On the left side it was found distant of IEM 12.96(±1.32) mm and of the AR 12.82(± 3.22)mm. The largest horizontal diameter found was of 3.32 (± 0.91) mm to the right and 3.25 (± 0.86) mm...
Tipo: Journal article
Palavras-chave: Mentonian foramen; M-CP-18 Jianchejiang point; Acupuncture; Morphology; Morphometry.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100039

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

Evaluación de las Variaciones del Ángulo de Torsión del Fémur en Fémures Aislados de Individuos Brasileños
Provedor de dados: 77
Autores: Gusmão,Luiz Carlos Buarque de; Brito Lima,Jacqueline Silva; Souza Rodrigues,Célio Fernando de; Santos,Eduardo José Lopes dos.
En corte axial del fémur, generalmente la orientación del eje del cuello femoral se ubica en diferente plano del eje de los cóndilos. La formación angular que el eje del cuello hace, en relación a la de los cóndilos, es conocida como ángulo de torsión femoral. Los autores realizaron mediciones de los ángulos de torsión (o antetorsión) en 56 fémures humanos adultos, de ambos sexos, siendo 26 derechos y 30 izquierdos. La literatura investigada presenta varios valores que varían de 8 a 25. Los valores obtenidos en las mediciones buscaron determinar el valor del ángulo de torsión en ese material y compararlo con los datos de la literatura. También se determinaron los valores que, permitieran conocer si el miembro inferior tenía rotación lateral o medial...
Tipo: Journal article
Palavras-chave: Anatomía; Miembro inferior; Osteotomías del fémur; Ortopedia.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100042

Morphogenesis of a Tunica Mucosa of Oviduct of the Hens
Provedor de dados: 77
Autores: Khokhlov,R. YU.; Kuznetcov,S. I.
The authors have used non-laying and laying hens (Lohmann Brown), in order to study morphological aspects development of tunica mucosa of the oviduct. The results showed that the oviduct of the hen is well-developed at the left side, atrophied at the right side and consists of five different regions: infundibulum, magnum, isthmus, shell-gland and excretory section (vagina). During 1-120 days in oviduct is the most advanced caudal part, where height and width folds of a tunica mucosa is more than in cranial part, that probably, is caused with the future function of these departments. In the period oviposition (150-540 days), the tunica mucosa is most advanced in such departments, as: magnum, isthmus, shell-gland
Tipo: Journal article
Palavras-chave: Oviduct; Anatomy; Histology; Morphology.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200014

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

The Impact of Proximol (Cymbopogon proximus) Intakeon Pregnant Albino Ratsand their Fetuses During Gestation Period
Provedor de dados: 77
Autores: Abdelrahman,Heba A; Omar,Amel R; Salah EL-Din,Eman Y.
Halphabarol, the active principle of Proximol, is the most potent of the four antispasmodics present in the national desert weed Cymbopogon proximus or ''Halfa Bar''. Halphabarol is of great value for the management of renal colic and in the expulsion of ureteric calculi as it causes dilation of the ureter below the site of calculus while active propulsion is maintained. Evaluation the congenital malformation of proximol in pregnant albino rats during gestation period. The virgin female rats were mated with male rats and the pregnant rats were orally administered a human equivalent dose (0.05 mg/kg) of Proximol from 5th-20th gestation day. At day 20 of pregnancy, all rats were anesthetized to obtained maternal and fetal data. The treatment group displayed...
Tipo: Journal article
Palavras-chave: Cymbopogon proximus; Halfa Bar; Malformation.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200019

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

Impronta Genómica y Desarrollo Embrionario
Provedor de dados: 77
Autores: Reig,German; Concha,Miguel L.
En los organismos diploides, cada gen autosómico está representado por dos copias, o alelos, heredados de cada progenitor al momento de la fecundación. Para la gran mayoría de los genes la expresión ocurre desde ambos alelos de manera simultánea. Sin embargo, un número reducido de genes (menos del 1%) es afectado por un proceso de impronta genómica. Este proceso determina que la expresión del gen sea dependiente del origen parental, es decir, se comporte de manera distinta si su origen es materno o paterno. La metilación del ADN es una de las modificaciones epigenéticas mejor estudiadas y su participación resulta esencial durante el establecimiento de la impronta genómica. Si bien los patrones de metilación a nivel genómico son estables y heredables,...
Tipo: Journal article
Palavras-chave: Impronta genómica; Metilación del ADN; Epigenética; Desarrollo embrionario.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400029

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

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

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

Hashimoto's Thyroiditis: Lingual and Labial Capillary Microcirculation in Patients Affected by Macroglossia
Provedor de dados: 77
Autores: Scardina,G. A.; Messina,P.
The aim of this study is to estudy lingual and labial microcirculation differences among healthy subjects and those with Hashimoto's thyroiditis affected by macroglossia. Twenty healthy patients and 20 patients suffering from Hashimoto's thyroiditis were examined. Labial and lingual capiUaroscopy were used to investigate the characteristics of microcirculation. For each patient we evaluated visibility, course, tortuosity and the possible presence of microhaemorrhages, average calibre of capillary loops and the number of visible capillary loops per square millimetre. The investigations of the labial and lingual mucous were simple, non invasive and repeatable for each patient. In Hashimoto's thyroiditis patients it was possible to observe a wide vascular...
Tipo: Journal article
Palavras-chave: Oral capiUaroscopy; Hashimoto's thyroiditis; Macroglossia.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200028

Huesos Suturales Umbilicados
Provedor de dados: 77
Autores: Silva,Juan; Araya,Claudia.
Los huesos suturales son huesos supernumerarios observables en suturas y fontanelas del cráneo, variables en su número, forma, tamaño y posición. Formados desde centros de osificación normales y/o adicionales. Calleja en 1870, describe un hueso sutural en forma de anillo con un centro óseo (umbilicados). Nuestro objetivo de investigación, fue buscar y describir estos huesos. Se utilizaron 71 cráneos de adultos chilenos de ambos sexos, en los cuales se buscó, caracterizó, fotografió y midió a los huesos suturales umbilicados. Se hallaron dos cráneos con presencia de estos huesos, representando el 2,82 % del total de la muestra y el 8 % de los cráneos con huesos suturales. Los resultados concuerdan con la bibliografía, en cuanto a presencia de huesos...
Tipo: Journal article
Palavras-chave: Huesos suturales; Huesos wormianos; Huesos del cráneo; Suturas y fontanelas del cráneo; Identificación médico legal.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200032

Osteoinductive Potential of the rhBMP-2 in Soft Tissues
Provedor de dados: 77
Autores: Issa,Joao Paulo Mardegan; Nascimento,Cássio do; Barbosa,Rodrigo Edson dos Santos; Iyomasa,Mamie Mizusaki; Albuquerque Junior,Rubens Ferreira de.
The rhBMP-2 is an osteoinductive protein used in the reconstructive with the objective to create newly formed bone. The aim of this study was to confirm the rhBMP-2 osteoinductive capability, when implanted in soft tissues. The results showed that the protein used in this study is highly osteoinductive
Tipo: Journal article
Palavras-chave: Bone repair; RhBMP-2; Osteoinduction; Soft tissue.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100018

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

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

The Ansa Cervicalis in Fetuses
Provedor de dados: 77
Autores: Pillay,P; Partab,P; Lazarus,L; Satyapal,K. S.
The formation of ansa cervicalis (AC) is somewhat complex with both its course and location along the common carotid artery and internal jugular vein (IJV) varying. The aim of the study was to document the anatomy, formation and variations of AC. Forty fetuses (gestational age: 15 to 28 weeks) were obtained from the Department of Clinical Anatomy, Westville Campus, UKZN. A detailed micro-dissection of the posterior triangle of the neck and AC were completed using standard micro-dissecting instruments. Results of the formation of AC, its relationship to IJV and variations were recorded. The superior root was identified as a long willowy nerve that branched from the hypoglossal nerve, descended on the carotid sheath, anterior to the common carotid artery and...
Tipo: Journal article
Palavras-chave: Ansa cervicalis; Superior root; Inferior root; Hypoglossal nerve; Internal jugular vein.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400011

Morfología, los Nuevos Desafíos para el 2015
Provedor de dados: 77
Autores: Inzunza,Oscar.
En los últimos decenios hemos asistido a proceso continuo de cambios en el ámbito de los ramos básicos de las carreras del área médica: 1) El progreso notable de algunas áreas del conocimiento científico como la biología molecular y la genética. 2) La inclusión en el currículo de cursos de ética y bioética. 3) La consecuente disminución del creditaje de los cursos de anatomía, histología y embriología. 4) Las dificultades para el acceso a financiamiento privado y público para investigaciones en temas morfológicos. 5) La escasa oferta de cursos de postgrado en el área morfológica. Irónicamente, estas condiciones desventajosas para la ciencia morfológica están ocurriendo en paralelo con los avances en las técnicas de imaginología médica, procedimientos que...
Tipo: Journal article
Palavras-chave: Morfología; Educación; Desafíos; Currículo de pregrado.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300008

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

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

Peculiaridades Anatómicas del Canal Semicircular Superior y su Posible Implicancia Clínica
Provedor de dados: 77
Autores: Whyte,Jaime; Martínez,Claudio; Cisneros,Ana; Whyte,Ana; Crovetto,Miguel Ángel.
El objetivo fue estudiar las peculiaridades en la morfología apical del canal semicircular superior, a nivel de la eminencia arcuata con la finalidad de obtener conclusiones aplicativas. Se estudiaron 48 cabezas de cadáveres humanos (96 huesos temporales), con la intención de identificar la presencia de adelgazamiento o dehiscencia del canal semicircular superior, así como la existencia de surcos vasculares de la eminencia acuata que, discurriendo sobre el techo del canal, pudieran afectar a su integridad anatómica. El estudio incluye un análisis histológico (Tricrómico de Martins) y radiológico (Tomografía Computarizada) de los hallazgos positivos (dehiscencias y adelgazamientos), así como estudio tomográfico de los canales con surcos vasculares visibles....
Tipo: Journal article
Palavras-chave: Canal semicircular superior; Dehiscencia; Pared adelgazada; Surcos vasculares.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300062

Moringa oleifera Impairs the Morphology and Functions of the Kidney in Adult Wistar Rats
Provedor de dados: 77
Autores: Akinlolu,Abdulazeez Adelaja; Ghazali,Olaide Kamal; Ameen,Oloduowo Mubarak; Oyebanji,Seunayo Comfort; Omotoso,Gabriel Olaiya; Enaibe,Bernard Ufuoma.
We tested the hypothesis that Moringa oleifera impairs the morphology and functions of the kidney in rats. Twenty-four adult male Wistar rats were employed in the study. Rats of Control Group I received physiological saline while rats of Groups II ­ IV received 250, 500 and 750 mg/kg bodyweight of methanolic extract of Moringa oleifera respectively for twenty one days. No behavioral anomalies were observed in rats of Groups I ­ IV. Rats of Control Group I gained statistically significant increased bodyweight while rats of Groups II ­ IV experienced non-significant decreased bodyweight during experimental procedure. (P0.05). No statistical significant differences (P0.05) were observed in the analyses of the relative weights of kidneys of rats of Groups I ­...
Tipo: Journal article
Palavras-chave: Moringa oleifera; Toxicity profile; Kidney.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200016

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

ESTUDIO ANATÓMICO DE LAS INSERCIONES DE LOS MÚSCULOS EXTENSORES RADIALES LARGO Y CORTO DEL CARPO
Provedor de dados: 77
Autores: Ferreira Caetano,Mauricio; Manna Albertoni,Walter; Benedito Caetano,Edie; Montaño Pérez,Rodrigo.
En el análisis de los tendones de los músculos extensores radiales largo y corto del carpo, basados en la disección anatómica de 60 miembros superiores de cadáveres adultos de raza blanca y sexo masculino, registramos que las variaciones anatómicas no son muy frecuentes. La presencia de tendones accesorios ocurrió en apenas 3 manos disecadas, todas del músculo extensor radial largo del carpo. La presencia de vínculos tendinosos uniendo los tendones, fue registrada en 17 piezas. La presencia de un tendón intermedio uniendo los dos tendones, fue verificada en 4 piezas. La inserción del tendón del músculo extensor radial largo del carpo ocurrió, invariablemente, en el lado radial de la base del segundo metacarpiano y del músculo extensor radial corto en el...
Tipo: Journal article
Palavras-chave: Anatomía; Músculos extensor radial largo y corto del carpo; Variación anatómica.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400001

Histomorphometric Changes in the Testes and Epididymis of Wistar Strain Albino Rats Following Fourteen Days Oral Administration of Therapeutic Doses of Some Antibiotics
Provedor de dados: 77
Autores: Awobajo,F. O; Raji,Y; Akinloye,A. K.
Studies on testes and epididymis tissue of rats treated orally for fourteen days with therapeutic doses of cloxacillin (6mg/100g/day), ampicillin (4mg/100/day) and tetracycline (12mg/100g/day) separately showed a significant reduction in testicular and epididimis architecture. Microscopic studies of these male reproductive organs further revealed a significant alteration in the epididymis as revealed by a significant reduction (p&lt;0.05) in epididymal ductular diameter (EDD), and epididymal epithelial height (EEH) in treated group of animals. A significant increase (p&lt;0.05) was however recorded in epididymal luminal diameter (ELD) in all the animals after the two and three week's recovery period allowed. This gives another insight into the toxicity...
Tipo: Journal article
Palavras-chave: Antibiotics; Testes; Epididymis; Histomorphometry.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400047

Grosores Tisulares Faciales en Cadáveres de Españoles y su Aplicación en la Identificación Médicolegal
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Pérez Rojas,Francisco Javier; Torres Muñoz,Sebastián Rene.
La reconstrucción facial a través de la escultura forense es una técnica en la cual, mediante el modelado con materiales plásticos sobre un esqueleto cefálico, se reproducen la estructuras blandas de la cara, con el propósito de ayudar al proceso de identificación médicolegal. Uno de los datos más relevantes para reproducir esta técnica corresponde a los valores de grosor tisular en determinados puntos del esqueleto craneal. En el presente estudio se analizaron los grosores tisulares, en 14 puntos craneométricos medianos y paramedianos de 32 cadáveres de individuos, españoles mediante la introducción de agujas en la piel. Los cadáveres fueron divididos en grupos de acuerdo a sexo y grupo etáreo. Se encontraron diferencias significativas en los valores de...
Tipo: Journal article
Palavras-chave: Grosor tisular; Antropología forense; Identificación humana.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100015

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

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

Variant Inferior Root of Ansa Cervicalis
Provedor de dados: 77
Autores: Babu,B. Prakash.
Ansa cervicalis is a loop of nerves found in the anterior wall of the carotid sheath in the carotid triangle of neck innervating infrahyoid muscles. Its superior root has fibres from the first cervical nerve that leaves the hypoglossal nerve and joins the inferior root formed by the branches from the second and third cervical nerves. The two roots join to form ansa cervicalis. The ansa cervicalis nerve formation is relatively complex, as its course and location along the great vessels of the neck vary. In the present case on the left side of an adult male cadaver the inferior root was absent and the contributions from C2 and C3 were joining independently with the superior root of ansa to form ansa cervicalis. However no such variation was found in the ansa...
Tipo: Journal article
Palavras-chave: Ansa cervicalis; Inferior root; Variation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100040

Terminología Morfológica Internacional: Algo Más que Anatomía, Histología y Embriología
Provedor de dados: 77
Autores: Losardo,Ricardo Jorge; Prates,Nadir Eunice Valverde Barbato de; Arteaga-Martínez,Manuel; Cabral,Richard Haltí; García-Peláez,María Isabel.
El estudio de la terminología morfológica internacional y su implementación en una normativa es complejo. La tarea que realiza el grupo de expertos morfólogos no es suficiente. Se explican algunos aspectos que nos acercarán al entendimiento de esta problemática y se muestra el camino para superar este desafío.
Tipo: Journal article
Palavras-chave: Terminología; Anatomía; Histología; Embriología; Morfología; Educación médica; Lingüística.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100063

Sergey Fedoroff: A Pioneer of the Neuronal Regeneration. Tribute from the Pan American Association of Anatomy
Provedor de dados: 77
Autores: Losardo,Ricardo Jorge; Cruz Gutiérrez,Rolando; Prates,José Carlos; Moscovici,Mauricio; Rodríguez Torres,Alberto; Arteaga Martínez,Manuel.
Sergey Fedoroff (1925-2012) is considered the father of tissue culture because of his important findings and contributions. He was president of several societies, such as the Pan American Association of Anatomy.
Tipo: Journal article
Palavras-chave: Sergey Fedoroff; Pan American Association of Anatomy; Tissue culture; Neurobiology.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200059

Piecewise Straight Line Approximation of Curve Existing in Slightly Curved Mesiobuccal Root Canal of Mandibular First Molar: A Radiographic Investigation
Provedor de dados: 77
Autores: Prabhakar,J; Priya,M. S; Doss,L. Jones Tarcius; Sukumaran,V. G.
The aim of this study was to radiographically investigate the curve existing in slightly curved mesiobuccal canal of mandibular first molar by applying Piecewise straight line approximation. Extracted human mandibular molars were radiographed and one hundred radiographs were selected whose mesiobuccal canal showed slight curvature (10-20°) according to Schneider's method. The curves were traced and analyzed using Piecewise straight line method. Each curve was considered as a unit consisting of six different pieces of straight lines joining at seven specific points and the angle of curvature at these points was determined using the slope formula. All curves analyzed in this study had varying degrees of curvatures at different points on the curve. Maximum...
Tipo: Journal article
Palavras-chave: Piecewise straight lines; Canal curvature; Mesiobuccal canal; Schneider method; Curvature radius; Canal simulation; Angle of curvature.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100021

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

How Does Protein Malnutrition or Food Deprivation Interfere with the Growth of the Epiphyseal Plate in Animals?
Provedor de dados: 77
Autores: da Silva,Karina de Carvalho; Silva,Camilla Rodrigues de Souza; Costa,Rita de Cássia da Silva; de Moraes,Sílvia Regina Arruda.
the aim of this study was to conduct a literature review of impacts of protein malnutrition and/or early food deprivation on the formation of the growth plate in young animals. A search was performed using the databases PubMed/MEDLINE, LILACS, SciELO and the Cochrane Library, without language restrictions or any limit as to year. Initially, 150 articles were identified, however, after application of the inclusion and exclusion criteria only five remained. In three studies the nutritional stress was due to protein malnutrition, another due to fasting and the fifth was due to food restriction. All the studies had some methodological omissions. The studies included in this review-demonstrated corroboration in the results obtained, regardless of whether the...
Tipo: Journal article
Palavras-chave: Epiphyseal plate; Bone growth; Protein malnutrition; Food deprivation.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200037

Grados de Rotación Cérvico-Capital de la Población de Caldas, Colombia
Provedor de dados: 77
Autores: Duque Parra,Jorge Eduardo; Barco Ríos,John; Moscoso Ariza,Oscar Hernán.
El presente trabajo sobre la rotación entre la columna cervical y la cabeza en el ser humano tiene como objetivo estandarizar los grados de rotación cérvico capital, tanto a la derecha como a la izquierda, en una muestra aleatoria obtenida de individuos de ambos géneros en el Departamento de Caldas (Colombia), estratificados de acuerdo a su ciclo vital a partir de los tres años de edad y que no presentaban ninguna alteración en los movimientos propios de la región antes mencionada. Mediante tablas estadísticas se muestran los resultados experimentales obtenidos y se comparan con los valores reportados en la literatura. Se observa, además, que los valores obtenidos están dentro del rango establecido en la literatura, sin embargo, los datos aquí referidos...
Tipo: Journal article
Palavras-chave: Axis; Columna cervical; Ciclo vital; Craneal; Rotación; Articulación trocoide.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400022

Expression of PECAM-1 and E-Cadherin in the Umblical Cords of Gestational Diabetic Mothers
Provedor de dados: 77
Autores: Tahaoglu,A. E; Togrul,C; Külahcioglu,M. I; Bademkiran,M. H; Balsak,D; Mavi gök,E; Ekinci,C; Deveci,E.
The purpose of this study is to examine the changes in the umbilical cord in women diagnosed with gestational diabetes mellitus In this study, as a control group human placental tissues from normotensive pregnancies was collected from diabetic women at 28­35 weeks of gestation. Gestational diabetes (n= 20) and normal umbilical cord (n= 20) for a total of 40 units were received.GDM groups compared to the control group was significantly higher values was detected (p&lt;0.01). In GDM group, light microscopy showed erosion of the endothelium and complete rupture of theumbilicalvessels resulting in extravasation of blood within Wharton's jelly. it was observed that the cytoplasmic fragments and cell infiltration of the spill to the subepithelial layer of...
Tipo: Journal article
Palavras-chave: Gestational diabetes mellitus; PECAM-1; Umblical cord; E-Cadherin.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400014

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

Histopathological Effects of Ischemia - Reperfusion on Intestinal Anastomotic Wound Healing in Dogs
Provedor de dados: 77
Autores: Akinrinmade,J. F; Olatunji-Akioye,A. O.
The histopathological effects of three levels of ischemia-reperfusion (IR) on healing of intestinal anastomotic wound were investigated in dogs. Three groups of dogs in which superior mesenteric artery (SMA) and collaterals were isolated but not occluded (A -control), isolated and occluded immediately distal to the aorta with collateral interruption using an atraumatic arterial clip for fifteen minutes (B) and for forty-five minutes (C) prior to ileal resection and anastomosis after return of normal perfusión in occluded groups was done. Within each group, animals were anaesthesized on third and seventh post-operative day. Grossly, impaired abdominal wound healing, intra-abdominal adhesions and partial and complete anastomotic dehiscence occurred in groups...
Tipo: Journal article
Palavras-chave: Histopathology; Ischemia-reperfusion injury; Intestinal anastomoses; Wound healing.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400020

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

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

High Concentration of Reticular Fibers in Periurethral Region of the Prostatic Urethra from Patients with Benign Prostatic Hyperplasia as Revealed by Stereology
Provedor de dados: 77
Autores: Manaia,Jorge H. M; Costa,Waldemar S; Sampaio,Francisco J. B; Figueiredo,Marcelo A; Cardoso,Gilberto P; Babinski,Marcio A.
The goal of this investigation was to analyze and quantify changes of the reticular fibers in the prostatic urethra of patients with benign prostatic hyperplasia (BPH) and compare with a control group. Prostatic urethra tissue samples were obtained from ten patients (age range 65 to 79 years, mean 66) with clinical symptoms of bladder outlet obstruction who had undergone open prostatectomy. The ten control group samples (urethral tissue samples from the transitional zone) were collected from prostates obtained during autopsy of accidental death adults of less than 25 years. The Vv of the reticular fibers was determined with stereologic methods from 25 random fields per sample using the point-count method with a M-42 grid test system. The quantitative data...
Tipo: Journal article
Palavras-chave: Prostatic urethra; Reticular fibers; Stereology.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300065

Evaluation of Articular Eminence Morphology and Inclination in TMJ Internal Derangement Patients with MRI
Provedor de dados: 77
Autores: Ozkan,Aydin; Altug,Hasan Ayberk; Sencimen,Metin; Senel,Bugra.
Articular eminence morphology and inclination are reported to be two predisposing factors for the internal derangement (ID). The purpose of this study is to investigate the relationship between the inclination and morphology of the articular eminence and ID. The study included 70 temporomandibular joints with ID in 35 patients: 51 joints had disc displacements with reduction (DDWR) and 19 joints had disc displacements without reduction (DDWOR). All subjects underwent bilateral high resolution magnetic resonance imaging scans which were performed in the sagittal and coronal planes with mouths closed and opened. Articular eminence morphology was characterized as box, sigmoid, flattened, or deformed. Articular eminence inclination was measured at three...
Tipo: Journal article
Palavras-chave: Articular Eminence; Internal Derangement; Magnetic Resonance Imaging.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200064

Meckel's Diverticulum: A Case Report
Provedor de dados: 77
Autores: Madhyastha,Sampath; Prabhu,Latha V; Saralaya,V; Prakash,.
Meckel's diverticulum is the most prevalent congenital anomaly of the gastrointestinal tract. It might remain completely asymptomatic or may mimic some disorders like Crohn's disease, Appendicitis and peptic ulcer diseases. A Meckel's diverticulum was found during routine dissection. A brief review of this anomaly, its embryological explanation, and probable clinical implications with its management is discussed in this report
Tipo: Journal article
Palavras-chave: Meckel's diverticulum; Congenital gastrointestinal anomalies; Dissection.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300007

Effects of Polymeric Zinc Propylen-Bis-Dithiocarbamate (Propineb) on Nasal Mucosa in Rats
Provedor de dados: 77
Autores: Samanci,Baver; Arslan,Eda; Samanci,Seyla Bolukbasi; Caypinar,Basak; Deveci,Engin; Söker,Sevda; Seker,Ugur.
The objective of this study was to evaluate the histopathologic and immunohistochemical effects of propineb on rat nasal mucosa. Twenty adult Sprague-Dawley rats weighing 180­220 g, were used as experimental animals. The rats were divided into propineb and control groups. The control group received distilled water with spray at the same time period. The experiment was terminated after three weeks. In each case, sections of the nosewere taken. In experimental group, microscopic examination of nasal respiratory mucosa revealed that degenerative changes in epithelium were observed in sections of propineb-treated group. There were also leukocyte infiltration and vascular dilatation detected in the connective tissue.We detected CD34-immunoreactive mononuclear...
Tipo: Journal article
Palavras-chave: Propineb; Nasal mucosa; Proliferating Cell Nuclear Antigen (PCNA); CD34.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100013

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

Simultaneous Occurrence of Three Anatomical Variations: Anomalous Right Subclavian Artery, Non-Recurrent Inferior Laryngeal Nerve and Right Thoracic Duct
Provedor de dados: 77
Autores: Peña,Elizabeth; Zúñiga,Janneth; Baena,Gloria.
In one male cadaver of Colombian nationality, dissected by a group of medical students during a gross anatomy course at the Universidad del Valle in Cali, Colombia, three anatomical variations were found: an anomalous or aberrant right subclavian artery (ARSA), a non-recurrent inferior laryngeal nerve and a right thoracic duct. The aortic arch gave origin to four instead of three arteries, which, from right to left, were the right common carotid, the left common carotid, the left subclavian and the right subclavian arteries. The anatomical variation of the right subclavian artery is known also as lusoria artery, in which case the artery passes behind the esophagus and the trachea in its course towards the right side of the neck. The perimeters of the...
Tipo: Journal article
Palavras-chave: Aberrant right subclavian artery; Recurrent laryngeal nerve; Thoracic duct; Genetic variation.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400006

Preservation of Haemal Nodes Fixed by Means of Two Different Aldehyde Fixatives: a Scanning Electron Microscopic Study
Provedor de dados: 77
Autores: Guerrero,F; Cerutti,P; Marcaccini,A.
Glutaraldehyde is the fixative most commonly used in electron microscope studies of biological tissues, however it is often necessary to use samples which were not fixed in this fixative, even with the usual uncertainty of the results that may be obtained. The fixation is the more delicate step of the sample processing. Therefore in this work, the quality of preservation of haemal nodes fixed with two classic aldehyde fixatives: formaldehyde and glutaraldehyde we have compared under the scanning electron microscope. Our results showed that both fixatives were successful in preserving the morphology of haemal nodes components; however glutaraldehyde conferred satisfactory results mainly in the preservation of parenchymal cells, whereas formaldehyde was...
Tipo: Journal article
Palavras-chave: Scanning electron microscopy; Fixation; Fixative; Haemal node; Glutaraldehyde; Formaldehyde.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200059

The Mental Foramen Position in Dentate and Edentulous Brazilian's Mandible
Provedor de dados: 77
Autores: Mendonca Amorim,Maise; Bevilacqua Prado,Felippe; Bicalho Borini,Cynthia; Oliveira Bittar,Telmo; Volpato,Maria Cristina; Groppo,Francisco Carlos; Ferreira Caria,Paulo Henrique.
The mental foramen has been reported to vary in position in different ethnic groups. Repeated failures during injections and operative procedures involving the mental foramen suggest the presence of local differences in a given population. The aim of the present study was to determine the position of mental foramen (MF) in a sample of one hundred seventy Brazilian adult dry mandible, being 79 edentulous and 91 dentate. The assessment was made, having as it referential, the base of the mandible (BM) and the mandibular symphisis (MS), whereby the comparisons were carried out considering genders, the mandible side (left or right), and dentition (dentate or edentulous). The statistical analysis was performed using multifatorial ANO VA (alpha=5%). It was found...
Tipo: Journal article
Palavras-chave: Mandibles; Mental Foramen.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400033

Immunohistochemical and Histopathological Changes in the Skin of Rats after Administration of Lead Acetate
Provedor de dados: 77
Autores: Sula,Bilal; Deveci,Engin; Özevren,Hüseyin; Ekinci,Cenap; Elbey,Bilal.
Lead acetate is a chemical compound. Sources of human exposure to this metal include many foods, drinking water and dust. The aim of this study was to determine the immunohistochemical and histopathological changes on the face skin after lead acetate application. Wistar Albino rats (180-200 g body weight) were divided into a controlled and lead acetate-exposed group. Rats received lead acetate at 500 ppm in their drinking water for 60 days. Both groups were fed with the same standard food, but lead acetate was added to the drinking water. During the experimental period, blood samples were drawn from the abdominal aorta of the anesthetised animals. At the end of exposure, body weight and blood lead levels were measured. Sections of rat facial skin were...
Tipo: Journal article
Palavras-chave: Lead acetate; Skin; Proliferating cell nuclear antigen; Vimentin.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300017

Hepatoprotective Effects of Tribulus terrestris Hydro-Alcholic Extract on Non-Alcoholic Fatty Liver- Induced Rats
Provedor de dados: 77
Autores: Almasi,Fatemeh; Khazaei,Mozafar; chehrei,Shima; Ghanbari,Ali.
Non-alcoholic fatty liver induces many complications to the liver tissue and also serum related parameters. Medicinal plants are the safe therapeutic strategy for the treatment of diseases. In this regards, the present study was conducted to evaluate the effect of Tribulus terrestris (T. terrestris) extract on non-alcoholic fatty liver in rats. In this experimental study, thirty male Wistar rats were divided into five groups (n=6). Animals in experimental groups were received high fructose diet (70 %) (HDF) daily alone or in combined with daily intraperitoneal injection of 500, 700 and 1000 mg/kg extract of T. terrestris. Control group of rats was feed with standard chow. The serum levels of biomarkers of liver and serum lipid profiles were assessed, also...
Tipo: Journal article
Palavras-chave: Cholesterol; NAFLD; Rat; Tribulus Terrestris.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100054

The Union Between Gracilis and Sartorius Muscles in Leontopithecus: Morphofunctional Analysis
Provedor de dados: 77
Autores: Marques,M. A.; Vasconcellos,H. A.; Azevedo,N. L.
The Golden Lion Tamarin (Leontopithecus rosalia) is an endemic primate of the Brazilian Atlantic coastal rainforest, still under serious extinction risk. Just a few is know about its anatomy, specifically the muscle unions. Due to the reasons exposed before, aiming understanding the locomotion of this and others primates, we decided to study the morphology and morphometry of the gracilis and sartorius muscles, and the relation between them, in three Leontopithecus species. The current study examined 18 adult animal carcasses, of both sexes and with no physical abnormalities on the studied region. The material belongs to the Rio de Janeiro Primatology Center collection. The posterior members were dissected till the gracilis and sartorius muscles level, when...
Tipo: Journal article
Palavras-chave: Leontopithecus; Muscle union; Gracilis muscle; Sartorius muscle; Anatomy.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300016

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

Metodología de Construcción de Objetos de Aprendizaje para la Enseñanza de Anatomía Humana en Cursos Integrados
Provedor de dados: 77
Autores: Bucarey,Sandra; Álvarez,Luis.
El presente trabajo, es el desarrollo de un Objeto de Aprendizaje sobre la Web, para la enseñanza de la Anatomía Humana, por parte de estudiantes de la Escuela de Medicina en la Universidad Austral de Chile. El desarrollo y uso de un objeto de aprendizaje para la comprensión del hígado humano, es más eficiente que en la forma de un clásico curso lineal, porque es compatible con los nuevos paradigmas educacionales, donde el aprendiz construye su propio conocimiento. Los objetos de aprendizaje permiten el aprendizaje significativo por el uso de una metodología dinámica, probando que esta forma de enseñanza es más eficiente que la enseñanza sin recursos multimediales. El desarrollo del objeto de aprendizaje, fue hecho con la participación de estudiantes de...
Tipo: Journal article
Palavras-chave: Anatomía Humana; Objeto de Aprendizaje; Hígado Humano.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400011

Third Head of Biceps Brachii Muscle, Associated with Musculocutaneous and Median Nerve Bilateral Communication and with a Communicating Branch Between Median Nerve Roots
Provedor de dados: 77
Autores: Cerda,Aladino.
Both biceps brachii muscle anatomical variations and the presence of communicating branches between the musculocutaneous nerve and the median nerve are common, and have clinical significance due to their connections and vulnerability. A case found during a routine dissection of the upper limb of a male cadaver is described, in which unilateral presence of a third head of the biceps brachii muscle coexists associated to a bilateral communication of the musculocutaneous nerve with the median nerve, and a unilateral communicating branch between the roots of median nerve. The morphological features and the prevalence of the case are presented, besides the discussion of its clinical significance.
Tipo: Journal article
Palavras-chave: Biceps brachii; Musculocutaneous nerve; Median nerve; Brachial plexus; Anatomical variations.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200022

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

Hippocampal Neuronal Apoptosis in Rat Offspring Due to Gestational Diabetes
Provedor de dados: 77
Autores: Ghafari,Soraya; Asadi,Ebrahim; Shabani,Ronak; Golalipour,Mohammad Jafar.
Gestational diabetes mellitus (GDM) defined as impaired glucose tolerance affects approximately 6 % of all pregnant women who have never before had diabetes, but who do have high blood glucose levels during pregnancy. This study was done to evaluate the apoptosis in the neuronal cells in the CA1, CA2 and CA3 subfields of hippocampus and dentate gyrus in offspring of gestational diabetes at the 7, 21 and 28 d in postnatal rats. Thirty Wistar rat dams were randomly allocated in control and diabetic group. Dams in diabetic group were received 40 mg/kg/BW of streptozotocin at the first day of gestation and control groups received an equivalent volume normal saline injection intraperitoneally (IP). Six offspring of GDM and control dams, at the 7, 21, 28...
Tipo: Journal article
Palavras-chave: Gestational diabetes; Hippocampus; Neuron; Apoptosis; TUNEL Assay; Dentate gyrus; Rat.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100029

Evaluación Práctica de la Anatomía Basada en la Teoría de las Inteligencias Múltiples de Gardner, Carrera de Odontología de la Universidad de Antofagasta, Chile
Provedor de dados: 77
Autores: García-Hernández,Fernando.
La evaluación constituye un proceso dinámico, continuo y de diagnóstico, inherente a la educación, que rebasa la simple calificación del rendimiento. Para el proceso evaluativo deben usarse todos los métodos disponibles, no sólo como medio para determinar la aprobación de la asignatura sino que como recurso para medir el proceso de enseñanza-aprendizaje y, que a su vez, permita al docente comprobar, en forma objetiva, el cumplimiento de lo establecido en el programa, gracias al uso de los diversos medios pedagógicos de enseñanza. Durante muchos años, la evaluación práctica anatómica consistió en la valoración de la disección de diversas regiones topográficas, interrogaciones orales sobre estructuras que se encontraban en dichas disecciones y en la...
Tipo: Journal article
Palavras-chave: Educación; Anatomía; Inteligencias múltiples.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000100016

Proceso Estiloides en una Muestra de Radiografías Panorámicas de la Ciudad de Temuco-Chile
Provedor de dados: 77
Autores: Fuentes Fernándes,Ramón; Oporto Venegas,Gonzalo; Garay Carrasco,Ivonne; Bustos Medina,Luis; Silva Mella,Héctor; Flores Flores,Homero.
El proceso estiloides es una proyección ósea cilindrica fina, que mide en promedio 25 mm. Se origina en la porción timpánica del hueso temporal. Este proceso puede encontrarse aumentado en longitud, situación que puede o no manifestarse con dolor. Se estudiaron 968 radiografías panorámicas de sujetos de ambos sexos de edades entre los 12 y 81 años. Fueron medidos los procesos estiloides sobre la radiografía, y se consideraron elongados los que presentaron una longitud mayor a 30 mm. De la muestra, el 3,61% presentaron procesos estiloides elongados, de éstos, 37,14% correspondieron a personas de sexo masculino, y 62,86% de sexo femenino. Al analizar según sexo, los individuos masculinos presentaron procesos más largos que los individuos femeninos, y para...
Tipo: Journal article
Palavras-chave: Proceso estiloides; Síndrome de Eagle; Radiografías panorámicas.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400010

Gestational Diabetes Induces Pancreatic Beta-Cells Apoptosis in Adult Rat Offspring
Provedor de dados: 77
Autores: Nazari,Zahra; Nabiuni,Mohammad; Ghaffari,Soraya; Saeidi,Mohsen; Shahriyari,Alireza; Golalipour,Mohammad Jafar.
Several studies indicated that pancreatic ß-cell death occurs in both type 1 and type 2 diabetes. This experimental study was designed to determine the effect of gestational diabetes on the ß-cells in 16-week-old rat offspring. By this aim, adult Wistar rats aged 10-12 weeks were randomly allocated in control and diabetic groups. The diabetic group received 40 mg/kg/body weight of streptozotocin (STZ) on day zero of gestation. After delivery, diabetic offspring of GDM mothers and controls at the age of 16 weeks were sacrificed and pancreases harvested and fixed. The number of ß-cells and were counted by Gomori's method staining. Also, apoptosis in pancreas tissue of diabetic and control offspring was detected by TUNEL assay. Results showed a significant...
Tipo: Journal article
Palavras-chave: Gestational diabetes mellitus; Pancreatic islets (Langerhans); SS-cell; Apoptosis; Rat offspring.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100003

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

Unusual Relationship between the Piriform Muscle and Sciatic, Inferior Gluteal and Posterior Femoral Cutaneous Nerves
Provedor de dados: 77
Autores: Jacomo,A. L; Martinez,C. A. R; Saleh,S. O; Andrade,M; Akamatsu,F. E.
Piriformis muscle syndrome has been increasingly recognized as a cause of leg pain. Overuse, strain, or anatomical variations of the relationship between the nerve and the piriformis muscle are thought to be the underlying causes of the entrapment of the sciatic nerve. We report a variation not previously described which was found during a routine dissection. During routine dissection of the left gluteal region of an adult male cadaver we observed a high division of the sciatic nerve and the presence of an accessory piriformis muscle. The sciatic nerve divided beneath the piriformis muscle and the common fibular nerve passed over the accessory piriformis muscle, whereas the tibial nerve reflected anteriorly to pass between the accessory piriformis and the...
Tipo: Journal article
Palavras-chave: Inferior gluteal nerve; Sciatic nerve; Piriformis muscle.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200008

Fibrolipomas de Cavidad Oral: Tumores Comunes en Sitios Poco Frecuentes: Reporte de Dos Casos y Revisión de la Literatura
Provedor de dados: 77
Autores: Rodríguez Carreón,Alma Angélica; Alvarez Paque,Leonardo; Cuevas González,Juan Carlos; Reyes Sanchez,Rogelio; Rodríguez Lobato,Erika; Mosqueda Taylor,Adalberto; Vega Memije,Elisa.
Los lipomas son tumores mesenquimales benignos compuestos por adipocitos maduros. Corresponden a casi el 50% de los tumores de tejidos blandos, presentes entre el 1 y 5% en cavidad oral, especialmente en mucosa yugal, piso de la boca y márgenes laterales de la lengua. Suelen ser asintomáticos y su color depende del espesor de la mucosa que lo cubre. Histológicamente están conformados por lóbulos de adipocitos maduros rodeados por una cápsula fibrosa. Las variedades histológicas están determinadas por el tejido adicional que contienen; los más frecuentes son el lipoma simple y el fibrolipoma. Su curso es benigno y el tratamiento consiste en la escisión quirúrgica. En el presente artículo se reportan dos casos de fibrolipoma, un tumor común en una...
Tipo: Journal article
Palavras-chave: Lipoma; Fibrolipoma; Adipocitos; Cavidad Oral.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100055

The Effective Injection Zone at the Popliteal Crease for Tibial and Common Peroneal Nerve Blocks and its Relation with the Origin Point of the Medial and Lateral Sural Cutaneous Nerves
Provedor de dados: 77
Autores: Zhong,Lei; Wang,Jincheng; Fang,Hongjuan; Qin,Yanguo; Zuo,Jianlin; Gao,Zhongli.
A popliteal nerve block may be used to provide anesthesia and extended analgesia of the lower extremity, to ameliorate severe and long lasting postoperative pain. The aim of this study was to elucidate the anatomical location of tibial (TN) and common peroneal (CPN) nerves in the popliteal crease for effective nerve block. Fifty fresh specimens from 27 adult Chinese cadavers (16 males and 11 females, age range from 35 to 87 years) were investigated. Twenty-two cadavers were used to identify nerve locations and 5 cadavers were used to determine the depths of nerves in cross section. TN was found to be located at 50% from the most lateral point of the popliteal crease at 1.4 cm deep to the surface. In 20% of the 50 specimens, the medial sural cutaneous nerve...
Tipo: Journal article
Palavras-chave: Tibial nerve; Common peroneal nerve; Nerve block; Anatomy.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100013

Mixture of Kerosene and Xylene: a Contribution to Clearing Agents
Provedor de dados: 77
Autores: Ofusori,David A; Ayoka,Abiodun O; Adeeyo,Olusola A; Adewole,Stephen O.
The aim of this study was to substitute costly and hazardous compound- xylene, used as clearing agent, with less costly compounds (mixture of xylene and kerosene) having less toxicity and without compromising the cellular integrity and staining characteristics of the sections. Tissues (liver and kidney) obtained from a presumable healthy adult Wistar rat, were fixed in 10% formol saline, separated in to five groups (A, B, C, D and E) and processed for light microscopic study adopting H &amp;amp; E staining procedure. During the clearing section, groups A, B, C, D and E were respectively cleared in solvent 1 (xylene only), solvent 2 (70ml xylene : 30ml kerosene), solvent 3 (50ml xylene : 50ml kerosene), solvent 4 (30ml xylene : 70ml kerosene) and solvent 5...
Tipo: Journal article
Palavras-chave: Xylene; Kerosene; Clearing agent; Liver; Kidney.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100036

Estudio Morfométrico de la Arteria Radial y su Implicación en la Cirugía de Revascularización Miocárdica
Provedor de dados: 77
Autores: Reyes Hernández,Cynthia Guadalupe; Velázquez Gauna,Sergio Everardo; Bazaldúa Cruz,Juan José; Hinojosa Amaya,José Miguel; Elizondo Omaña,Rodrigo E; Guzmán López,Santos.
La arteria radial (AR) es utilizada en la práctica médica para la realización de diversos procedimientos quirúrgicos, entre los que destaca la cirugía de revascularización miocárdica. En la literatura actual hay poca información acerca de la compatibilidad de esta arteria con otros conductos vasculares. El objetivo fue determinar las características anatómicas, morfométricas y distribución de la arteria radial en el antebrazo. Se disecó la arteria radial de 10 antebrazos de cadáveres embalsamados; se identificaron y registraron los ramos musculares y vasa nervorum emitidos por la arteria, se midió la longitud total y obtuvieron tres muestras (proximal, media y distal) de cada una para ser procesadas mediante técnicas histológicas y se determinaron los...
Tipo: Journal article
Palavras-chave: Morfometría; Arteria Radial; Cirugía de revascularización miocárdica.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300001

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

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

Morphometric Study of the Humerus Segments in Indian Population
Provedor de dados: 77
Autores: Somesh,M. S; Prabhu,Latha V; Shilpa,K; Pai,Mangala M; Krishnamurthy,Ashwin; Murlimanju,B. V.
The aim of the present study was to obtain the measurements of the different humerus segments and to estimate the length of humeri from them. For this purpose 100 (51 left and 49 right) sex-aggregated, adult dry humerus from Indian population, were taken to analyze the morphometric details of the humerus segments. The distance between five different segments viz: most proximal point of the humeral head and greater tuberosity (HA), head of the humerus and surgical neck of humerus (HB), proximal and distal point of olecranon fossa (HC), the distal point of olecranon fossa and trochlea of humerus (HD), proximal point of olecranon fossa and distal point of trochlea of humerus (HE) and finally the maximum length of humerus (HL) were obtained by means of an...
Tipo: Journal article
Palavras-chave: Humerus segments; Morphometry; Forensic anthropology.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400017

Presencia y Morfometría de Forámenes y Canales en Relación a las Espinas Mentonianas
Provedor de dados: 77
Autores: Soto,Reinaldo; Cáceres,Felipe; García,Roberto.
Los procedimientos quirúrgicos desarrollados en la porción anterior del cuerpo mandibular, como por ejemplo la instalación de implantes oseointegrados, genioplastias, profundizaciones de flanco lingual, fracturas, etc. pueden presentar complicaciones de importancia cuando estas invaden estructuras vasculares, con la consecuente hemorragia y formación de hematomas sublinguales. Dentro de estos elementos anatómicos se encuentran forámenes y canales que se ubican en relación a las espinas mentonianas. El objetivo de este estudio fue cuantificar la ubicación, diámetro y longitud de los forámenes y canales presentes por superior, inferior y entre las espinas mentonianas superiores e inferiores en 71 mandíbulas secas de la Unidad de Morfología de la Universidad...
Tipo: Journal article
Palavras-chave: Canal lingual; Espinas mentonianas.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200009

El Extracto Acuoso de Orégano (Lippia graveolens HBK) del Norte de México Tiene Actividad Antioxidante sin Mostrar un Efecto Tóxico in vitro e in vivo
Provedor de dados: 77
Autores: Soto-Domínguez,Adolfo; García-Garza,Rubén; Ramírez-Casas,Yolanda; Morán-Martínez,Javier; Serrano-Gallardo,Luis Benjamín.
Desde tiempos antiguos la medicina tradicional ha usado extensamente las especies del género Lippia como analgésicos, antiinflamatorios, antipiréticos, antifúngicos, etc. Numerosos estudios describen diversos compuestos presentes en extractos acuosos, metanólicos, o aceites esenciales de estas plantas, siendo los flavonoides los compuestos más abundantes. Sin embargo, la composición y cantidad de los metabolitos secundarios dependen de la zona geográfica, factores climáticos, altitud, época de cosecha y estado de crecimiento de estas plantas. El objetivo de este estudio fue evaluar la actividad antioxidante del extracto acuoso de orégano (Lippia graveolens HBK) del Norte de México y su efecto tóxico in vitro e in vivo. La capacidad antioxidante del...
Tipo: Journal article
Palavras-chave: Antioxidante; Orégano; Análisis morfológico.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300029

Peso del Corazón y Pulmones en Relación al Sexo, Grupo Étnico, Edad e Índice de Masa Corporal en Individuos Chilenos
Provedor de dados: 77
Autores: Olave,E; Torrez,J. C; Riquelme,N; Ibacache,L; Binvignat,O.
Diversos factores pueden influir en el peso de las vísceras torácicas y/o abdominales. Con el propósito de conocer el peso promedio del corazón y pulmones de individuos chilenos, se obtuvo la información de estos órganos procedentes de 775 necropsias de cadáveres frescos, entre los años 2009-2013, considerando su procedencia étnica (Mapuches y no Mapuches), edad, sexo e índice de masa corporal. Se estudiaron los datos de órganos sin lesiones ni enfermedades aparentes. En relación a la edad, el peso promedio del corazón se incrementó en ambos grupos étnicos y ambos sexos. Este incremento fue similar en los individuos de sexo masculino de ambos grupos étnicos, con un valor de 13%. En los individuos de sexo femenino hubo un aumento de 36% en el grupo étnico...
Tipo: Journal article
Palavras-chave: Anatomía; Tórax; Peso visceral; Corazón; Pulmones.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300020

Morphological Analysis on the Occipital Condyles and Review of the Literature
Provedor de dados: 77
Autores: Aragão,José Aderval; de Santana,Guilherme Machado; da Cruz de Moraes,Rebeca Zelice; Aragão,Iapunira Catarina Sant'Anna; Aragão,Felipe Matheus Sant'Anna; Reis,Francisco Prado.
Most anatomical and biomechanical studies on the craniovertebral junction have involved morphological or morphometric analysis on the occipital condyles. Some of these studies have provided important findings based on different surgical procedures. The shape, size and angle of the occipital condyles and the locations of the intracranial and extracranial orifices of the hypoglossal canal are highly important because they may affect the lateral approaches to the craniovertebral junction. To determine the frequency of occurrence of different morphological types of occipital condyle. 214 occipital condyles in 107 dry human skulls were analyzed and the classification of their morphological types was determined through assessing digitized photographic images....
Tipo: Journal article
Palavras-chave: Skull; Occipital condyle; Atlanto-occipital joint; Surgical anatomy; Craniofacial abnormalities; Morphology; Occipital bone.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300050

Principal Component Factor Analysis of the Morphostructure of Immature Uda Sheep
Provedor de dados: 77
Autores: Salako,A. E.
Ten body measurements were taken on 30 Uda sheep aged 0-14 months within the humid southwest Nigeria. The body measurements were wither height (WH), body length (BL), rump length (RL), rump height (RH), rump width (RW), foreleg length (FL), shoulder width (SW), face length (FaL), tail length (TL) and heart girth (HG). The aim was to investigate the variance structure and provide an objective description of the body shape (conformation) of the sheep within the first years of life using a cluster analysis. This was possible sequel to the application and permission of the Pearson's correlation coefficient. Applying the traditional use of wither height for size estimation, the animal measured 65.83±5.81cm. Other body measurements for that age group were:...
Tipo: Journal article
Palavras-chave: Morphostructure; Uda sheep.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500009

Morphological Distinguish of Rupture Status between Sidewall and Bifurcation Cerebral Aneurysms
Provedor de dados: 77
Autores: Qiu,Tianlun; Xing,Haiyan.
We suspect that morphological change of two types of aneurysms in ruptured and unruptured aneurysms are distinguishing because of different location and haemodynamics. So it is necessary to discuss sidewall and bifurcation type aneurysms in ruptured and unruptured state respectively. We used 209 consecutive aneurysms (144 ruptured, 65 bifurcation type) to assess the following parameters in 3D: maximum diameter (Dmax), maximum height (Hmax), aspect ratio (AR), size ratio (SR), height/width ratio (HW), bottleneck factor (BNF, width/neck) and inflow angle (IR). These aneurysms were divided into four groups by whether ruptured and sidewall or bifurcation. 4 groups were pairwise compared by univariate analysis and some parameters with significant variation were...
Tipo: Journal article
Palavras-chave: Intracranial aneurysm; Cerebral aneurysm; Risk factor; Subarachnoid hemorrhage; Morphology; Rupture.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300059

Modificaciones Estructurales en el Estómago y el Hígado de Paralabrax maculatofasciatus (Steindacher, 1868) ante Situaciones de Estrés Crónico
Provedor de dados: 77
Autores: Zacarías,M; Cadena,M; Rivas,P.
Para determinar el efecto del estrés a nivel del aparato digestivo, organismos de la especie Paralabrax maculatofasciatus fueron sometidos a dos modelos de estrés: el primero por descenso en el nivel del agua (n=84) por 30 y 60 minutos diariamente, y el segundo por cultivo a altas densidades (n=96) de 1,6 y 3,2 kg/100 1. Se tomaron muestras de estómago e hígado y se fijaron en formol al 10%. Los tejidos fueron incluidos en parafina, realizándose cortes de 6 um que se tiñeron con H-E. En ambas condiciones de estrés el estómago presentó cambios morfológicos importantes tales como hipertrofia y atrofia en la capa mucosa. En el hígado se observaron cambios de coloración y textura, así como hemolisis, inflamación y necrosis. Por descenso en el nivel del agua el...
Tipo: Journal article
Palavras-chave: Estrés; Paralabrax maculatofasciatus; Histopatología.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200019

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

Estudio Inmunohistoquímico Comparativo del Receptor de Estrógeno en Tejido Endometrial de Ovejas Razas Texel y Araucana
Provedor de dados: 77
Autores: Vasconcellos,Adriana; Cisternas,Carla; Paredes,Marco.
La asociación de factores genéticos, nutricionales y ambientales afecta directamente la fertilidad de las ovejas sin embargo en condiciones de similitud ambiental, la raza es un factor determinante existiendo razas de alta fertilidad como por ejemplo Texel y Suffolk y otras de fertilidad estándar tales como Romney y Criolla Araucana. La fertilidad es modulada por las hormonas sexuales que actúan mediante la unión a receptores específicos. En ovinos el receptor de estrógeno alfa (ER-a) esta ampliamente distribuido en el sistema reproductivo y es responsable de la modulación de varios mecanismos asociados con la función del sistema reproductivo. Un factor posiblemente relacionado con la diferencia en la fertilidad entre razas de ovinos, es el nivel de...
Tipo: Journal article
Palavras-chave: Receptor de estrógeno alfa; ER-a; Prolificidad; Texel; Criolla araucana.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300060

Lingual Radicular Rift Valley in a Mandibular Right First Premolar Root: Report of a Rare Case and Review of the Literature
Provedor de dados: 77
Autores: Hong,Xiao; Zhang,Ru; Pan,Hongying; Zhang,Wanmei; Hu,Tao.
Irregular root configurations which often challenge the requirements of successful root canal treatments are always misleading doctors to incorrect clinical judgments and treatment planning. In this article we describe a rare case of CBCT C-shaped mandibular premolar with a huge area of invagination measuring 6 mm ´ 3 mm, which we termed a "radicular rift valley" from a 76-year-old man. Considering the complex process of differential diagnosis, the overall status of disease condition and the will of the patient we proposed five treatment plans and finally conservatively chose plan B composed of both RCT and periapical scaling. A related literature review is also added into this article to describe the whole situation of root invagination, to stress the...
Tipo: Journal article
Palavras-chave: Radicular groove; Premolars; CBCT; Root canal treatment.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100052

Resultados Iniciales de la Cirugía de la Obesidad con Gastrectomía Vertical y By-Pass de Yeyuno
Provedor de dados: 77
Autores: Manterola,Carlos; Alamo,Munir; Horta,Jaime; Icarte,Miguel Ángel; Riveros,Claudia; Ayala,Carlos; Mendoza,Estela.
La obesidad mórbida (OM), es una enfermedad crónica que se asocia a riesgo de morbilidad y mortalidad. La cirugía ha demostrado ser la mejor opción terapéutica. El objetivo de este estudio, fue reportar los resultados de una serie de pacientes intervenidos quirúrgicamente por OM con gastrectomía vertical y by-pass de yeyuno (GVBY), en términos de reducción del IMC. Serie de casos prospectiva. Se incluyeron todos los pacientes intervenidos quirúrgicamente por OM, en el Servicio de Cirugía del Hospital Clínico de la Universidad Mayor, Temuco, Chile; en el período 2009 y 2014. Todos los pacientes fueron operados con una GVBY. La variable resultado fue reducción del IMC. Otras variables de interés fueron tiempo quirúrgico, estancia hospitalaria, morbilidad...
Tipo: Journal article
Palavras-chave: Obesidad mórbida; Cirugía bariátrica; Cirugía de control metabólico; Índice de masa corporal.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300040

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

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

Recuperación Ósea en Procedimientos de Reconstrucción y Colocación de Implantes
Provedor de dados: 77
Autores: Olate,Sergio; de Oliveira,Greison Rabelo; Jaimes,Miguel; Barbosa,Jose Ricardo de Albergaria-.
La implantología ha evolucionado rápidamente en los últimos 40 años y el empleo de biomateriales en la recuperación de tejidos es cada vez más frecuente. Por esta razón, es necesario conocer el proceso de reparación y la reacción producida entre los los tejidos huéspedes y los biomateriales a nivel histológico, ya que ello contribuirá al éxito, en el largo plazo, de los tratamiento rehabilitadores. Clínicamente, se ha podido observar la efectividad de diferentes compuestos, pero cuando han sido analizados histológicamente, han demostrado algunas variaciones que, muchas veces, las hacen inaceptables para la terapia odontológica. Los objetivos de esta revisión es conocer la forma en que se produce la cicatrización ósea en torno a diferentes biomateriales y...
Tipo: Journal article
Palavras-chave: Cicatrización ósea; Biomateriales; Implantes.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300030

Morfometría de la Parótida de Ratón Infectado por la Cepa RAL de Trypanosoma cruzi en Función del Sexo
Provedor de dados: 77
Autores: Albuquerque,Sergio de; Lopes,Ruberval Armando; Sala,Miguel Angel; Abraháo,Ana Amelia Carraro; Ribeiro,Rosa Domingues.
Fueron estudiadas las alteraciones y el nivel de deterioro de las parótidas de animales infectados con la cepa RAL de Trypanosoma cruzi. Se utilizaron ratones albinos (Mus musculus) de ambos sexos, debido al dimorfismo sexual de las glándulas salivares, inoculados con 2 x 10(4) tripomastigotes sanguíneos de la cepa RAL del T. cruzi. Los animales fueron sacrificados al 12° día de infección, coincidiendo con el pico parasitémico. La parótida fue procesada histológicamente y, posteriormente, evaluada histopatológica y morfometricamente. Los resultados permitieron verificar intenso parasitismo en la glándula, la que presentó desorganización estructural y atrofia generalizada de acinos y conductos, más intensos en las hembras. Concluyendo, la cepa RAL del T....
Tipo: Journal article
Palavras-chave: Trypanosoma cruzi; Cepa RAL; Ratón; Parótida; Histopatología; Morfometría.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200004

Morphological Alterations in Mouse Placenta Induced by Diazepam
Provedor de dados: 77
Autores: Márquez-Orozco,María Cristina; Gasca-Ramírez,María Verónica; de la Fuente-Juárez,Graciela; Márquez-Orozco,Amalia.
Diazepam (DZ) is a benzodiazepine that belongs to the group of minor tranquilizers with myo-relaxing and anticonvulsant properties. DZ and its metabolites cross the placental barrier in human, monkey, hamster, and mouse, and accumulate in the placenta. Our aim was to investigate, through histological techniques, and semifine sections if DZ induces morphological changes in the placenta. Twenty female mice of the ICR strain were distributed randomly in two groups. One group (DZ) was treated from days 6 to 17 of gestation with a single daily subcutaneous (sc) dose of DZ of 2.7 mg/kg/ (bw); the second, control group (C) was treated with saline solution. All females (10 DZ and 10 C) were killed by decapitation. Placentas were extracted and fixed in...
Tipo: Journal article
Palavras-chave: Benzodiazepine; Diazepam; Mouse; Placenta; Histology.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200007

Expression of Mmp-20 in Dental Germs of Human Fetus
Provedor de dados: 77
Autores: Gutiérrez Cantú,Francisco Javier; Mariel Cárdenas,Jairo; Oliva Rodríguez,Ricardo; Romo Ramírez,Gabriel Fernando; Sánchez Méraz,Wulfrano; Mariel Murga,Humberto; Leal Tobias,Luis Armando.
During experiments in animal studies, it has been observed that enamelysin (MMP-20) is expressed during tooth development in the late secretory stage of amelogenesis but not in the mature enamel.The aim of this research was to determine the location of MMP-20 in human tooth germs in the different structures of the enamel organ.The detection of MMP-20 was performed by immunohistochemistry in 20 specimens obtained from human fetuses. Immunostaining of MMP-20 was observed from the presecretor stadium in stellate reticulum and intermediate stratum and in the basal portion of ameloblasts in the secretory stage in stellate reticulum, stratum intermedium, secretory ameloblasts, odontoblasts and dental papilla. The results of this research show the location of...
Tipo: Journal article
Palavras-chave: Enamelysin; Immunohistochemistry; Ameloblasts; Odontoblasts.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400022

Presencia y Morfometría de Forámenes y Canales Linguales en Cone Beam CT de Mandíbulas de Individuos Chilenos: Correlación con Medición Directa en Hueso
Provedor de dados: 77
Autores: Cáceres,Felipe; Pardo,Sebastián; Concha,Guillermo; Soto,Reinaldo.
Se han descrito forámenes ubicados en la cara interna del sector mandibular anterior, ya sea en hueso seco, radiografía convencional y en estudios mediante cone beam CT (CBCT). El objetivo de este estudio fue comparar la presencia, posición y las características anatómicas de los forámenes y canales linguales encontrados en CBCT de mandíbulas Chilenas secas, con los resultados de la misma muestra estudiada con visión directa en hueso seco. Se utilizaron 68 mandíbulas secas de la unidad de morfología de la Universidad de los Andes. Se evaluó número de dientes remanentes, número de forámenes relacionados con las espinas mentonianas, posición, área y longitud de cada canal en hueso seco y en CBCT de la misma muestra. Se encontró presencia del foramen lingual...
Tipo: Journal article
Palavras-chave: Foramen lingual; Canal lingual; Cone beam CT; CBCT.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100047

The Qualitative Effects of Resveratrol and Coenzyme Q10 Administration on the Gluteus Complex Muscle Morphology of SJL/J Mice with Dysferlinopathy
Provedor de dados: 77
Autores: van der Spuy,Wendy Jeannette; Pretorius,Etheresia.
Dysferlinopathy is a form of muscular dystrophy affecting muscles of the shoulder and pelvic girdles, resulting from inheritance of a mutated dysferlin gene. The encoded dysferlin protein is proposed to be involved in sarcolemmal vesicle fusion with a disrupted plasma membrane; however, with defective protein function these vesicles accumulate beneath the disruption site but are unable to fuse with it and reseal the membrane, thus rendering the membrane repair mechanism defective. The SJL/J mouse model presents with characteristics much like the commonest human condition. Immune modulators have long been under study in the maintenance of muscle health in muscular dystrophies. Such supplementary treatment would ideally suppress inflammation, preventing the...
Tipo: Journal article
Palavras-chave: Dysferlinopathy; Coenzyme Q10; Resveratrol; Sarcolemma.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300035

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

Immunological Distribution of the Placental Lactogene and IGF-1 Receptor on Free-chorionic Villi of the Newborns Small for Gestational Age Placentae
Provedor de dados: 77
Autores: Prieto,Ruth; Matamala,Fernando; Rojas,Mariana.
The aim of this study was observe differences in the immunological distribution of the placental lactogene and IGF-1 receptor on free-chorionic villi, between studied groups and to relate the neonatal diagnosis of PEG with morphometric and immunohystochemical characteristics of the placenta. A total of, twelve placentas from AEG newborn and twelve from PEG newborn were obtained from the Maternity Ward of Temuco, Chile. H&amp;E, Alcian blue and Masson's trichromic stains, as well as Hematoxilyn-PAS. In the immunoperoxidase technique, were used: 1) placental lactogen (polyclonal, dilution 1:200, NCL-PLP, Novocastra) 2) Insuline-1 like growth factor (monoclonal, dilution 1:200, NCL-GHR, No vocastra). Differences between PEG and AEG placentae in the...
Tipo: Journal article
Palavras-chave: IGF-1 receptor; Free-chorionic villi; Newborns; Gestational age.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400039

Scientific Plagiarism, is Also Present in the Morphological Sciences
Provedor de dados: 77
Tipo: Journal article
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400001

Origin, Evolution and Homologies of the Weberian Apparatus: A New Insight
Provedor de dados: 77
Autores: Diogo,Rui.
The Weberian apparatus is essentially a mechanical device improving audition, consisting of a double chain of ossicles joining the air bladder to the inner ear. Despite being one of the most notable complex systems of teleost fishes and the subject of several comparative, developmental and functional studies, there is still much controversy concerning the origin, evolution and homologies of the structures forming this apparatus. In this paper I provide a new insight on these topics, which takes into account the results of recent works on comparative anatomy, paleontology, and ontogeny as well as of a recent extensive phylogenetic analysis including not only numerous otophysan and non-otophysan extant otocephalans but also ostariophysan fossils such as...
Tipo: Journal article
Palavras-chave: Evolution; Functional anatomy; Ostariophysi; Otocephala; Otophysi; Phylogeny; Teleostei; Weberian apparatus.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200008

The Gut and Lung Morphometry in Experimental and Natural Lineage 1 Variant of Peste des Petits Ruminants Virus Infection in Nigerian Goats
Provedor de dados: 77
Autores: Emikpe,B.O; Taiwo,V. O; Onilude,O. M.
The lung and gut morphometry in both natural and experimental Peste de petit ruminant (PPR) virus which are scanty in literature hence the need for this study. The goats that were submitted for necropsy in the Department of Veterinary Pathology University of Ibadan between 2009 and 2010 and the gross pathological diagnosis were PPR were enrolled in this study. The degree of pneumonia as a percentage of the total lung volume was estimated using standard methods. The gut morphometry of goats experimentally infected with PPR virus was also used. Student "T" test was used for the test of significance in evaluating the effect of age, sex and the lung consolidation pattern in natural PPR and analysis of the gut morphometry. Complicated PPR had significant higher...
Tipo: Journal article
Palavras-chave: Morphometry; Gut; Pneumonia; Natural PPRV; Experimental PPRV; Goats.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200048

Unusual Third Head of the Sternocleidomastoid Muscle from the Investing Layer of Cervical Fascia
Provedor de dados: 77
Autores: Sirasanagandla,Srinivasa Rao; Bhat,Kumar M. R; Pamidi,Narendra; Somayaji,S. Nagabhooshana.
The abnormal origin, presence of additional head and layered arrangement of fibers are the reported variations of sternocleidomastoid muscle in the past. In the present case we report a rare unusual origin of third head of the sternocleidomastoid muscle in a 60 year-old male cadaver. This additional head originated from the investing layer of cervical fascia in the roof of the subclavian triangle close to the clavicle and traversed obliquely upward, forward and fused with clavicular head. The insertion and nerve supply of the muscle was found to be normal.
Tipo: Journal article
Palavras-chave: Sternocleidomastoid muscle; Anatomical variation; Third head.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300001

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

Median Nerve Location Change Evaluated by Soft Cadaver Dissection According to the Forearm Movement
Provedor de dados: 77
Autores: Kwon,Seongoh; Jeong,Young Gil; Lee,Nam Seob; Han,Seung Yun; Uhm,Chang Sub; Kim,Dasom; Lee,Je-Hun.
The aim of this study was to examine the change in median nerve location according to forearm movement. Thirty fresh specimens from 15 adult Korean cadavers (10 males and five females; age range, 53­91 years) were examined. We measured the motor entry point according to normal and pronated positions of the forearm. The x and y coordinates of the first motor entry point (MEP) in the normal position were 1.6±0.6 cm and 2.8±1.3 cm, respectively. The depth of the MEP was 1.5±0.3 cm. The x and y coordinates of the second MEP were 1.3±0.3 cm and 4.7±1.7 cm, respectively. The depth of the MEP was 1.4±0.2 cm. The x and y coordinates of first MEP with the forearm in the pronated position were 1.9±0.7 cm and 2.3±0.8 cm. respectively. The depth of the MEP was 1.7±0.4...
Tipo: Journal article
Palavras-chave: Anatomy; Median nerve; Forearm movement; Motor entry point; Injection.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200052

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

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 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

The Tibial Nerve and Its Vasculature: An Anatomical Evaluation
Provedor de dados: 77
Autores: Elbarrany,Wagih G; Altaf,Faris M.
The study has contributed to evaluate the tibial nerve and its vasculature anatomically. Ten preserved cadavers (5 male, 5 female) have been used for this study. Each cadaver was injected with red latex and through incisions the tibial nerve was exposed at the level of bifurcation of sciatic nerve. The tibial nerve in 85 % cadavers was located between middle and lower thirds at upper angle of popliteal fossa; whereas, in 15 % cadavers it was present below the piriformis muscle in gluteal region. The total length of the tibial nerve was at a mean of 65.26±14.42 cm in males and 64.79±67.61 cm in females, without significantly different. Its total diameter was at a mean of 5.51±1.55 mm, with a mean of 4.11±0.88 mm at the popliteal fossa and a mean of...
Tipo: Journal article
Palavras-chave: Tibia; Fibular artery; Posterior tibial artery; Vascularized nerve grafts.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300004

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

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

Morphometric Analysis of the Menisci of the Knee Joint in South Indian Human Fetuses
Provedor de dados: 77
Autores: Murlimanju,B. V; Nair,Narga; Pai,Shakuntala R; Pai,Mangala M; Gupta,Chandni; Kumar,Vishal; Pulakunta,Thejodhar.
The morphometrical data related to the menisci of the adults have been reported by few authors and that of the fetuses have not been reported. The aims of the present study were to analyse the external circumference thickness, the width, peripheral and inner border lengths, and the distance between anterior and posterior horns of the fetal menisci and to compare the meniscal dimensions with that of the adult meniscal parameters which are available in the literature. The menisci from 106 knee joints of the formalin fixed South Indian fetuses which were obtained from the anatomy department were analysed. The fetuses which had musculoskeletal anomalies were excluded from the study. A vernier caliper of 0.02 mm accuracy and a non elastic cotton thread were...
Tipo: Journal article
Palavras-chave: Morphometry; Knee joint; Menisci.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400029

External Morphological Features of the Gills of Ichthyophis bannanicus Embryo (Amphibia, Gymnophiona)
Provedor de dados: 77
Autores: Meng,Shaoquan; Bei,Yongjian; Li,Guifen; Lu,Ronghui; Qi,Baomin; Wu,Defeng.
The gills of Ichthyophis bannanicus have yet to be investigated. This paper describes the external morphological features of the gills of mature I. bannanicus embryos exhibiting three pairs of gills on their neck region. Each gill is composed of an axis and filaments. In newly released embryos, the filaments and the axis form at approximately 90° relative to each other; eventually, this angle decreases and the color of the gill fades. The filaments on the axis are arranged alternately, and their spacing varies. The mid-pair of gills is significantly longer by nearly twofold than the front and rear pairs. Likewise, the lengths of the front and rear pairs of gills are not significantly different (P &amp;gt;0.05); for the same pair of gills, the lengths of...
Tipo: Journal article
Palavras-chave: Amphibia; Caecilian; External gill; Morphology.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100034

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

Morphological Aspects of Spermatogenic Cells at Different Stages of Sexual Maturation in Black Isogenic C57BL/6/Uni Mice
Provedor de dados: 77
Autores: Martins,M. R. F. B; Silva,P. J. R; Martins,B. B; Zoca,S. M; Freitas,M. A; Batista,T. C.
In order to study the morphological changes that occur in cells of the testes of isogenic black mouse C57BL/6/Uni into three periods during spermatogenetic used 15 mice divided into 3 groups of 5 animals with 40, 50 and 60 days of age. The mice were sacrificed and weighed. Then weighed and measured the testicles, to be processed finalmete histologically and stained with HE, PAS and Masson Massom-H and evaluated under light microscopy. Was observed in group I with 40 days of age in the seminiferous tubules had a lumen with sparse small amount of interstitial tubular cells. In the seminiferous epithelium were identified type A spermatogonia, intermediate and B, which occupied the compartment adbasal and intermingled with these cells was observed in...
Tipo: Journal article
Palavras-chave: Spermatogenesis; Mouse; Testes.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100052

Study and Clinical Application of the Anatomy of Renal Pedicles in Retroperitoneoscopic Nephrectomy
Provedor de dados: 77
Autores: Zhang,Nan; Shan,Zhongjie; Han,Qianhe; Chen,Kun; Guo,Liang.
This work aims to investigate the anatomical basis and clinical application value of renal pedicle locating in retroperitoneoscopic nephrectomy. To summarize the anatomical basis of renal pedicle locating through retrospective analysis of 278 cases of retroperitoneoscopic nephrectomy from July 2007 to September 2009, during which renal pedicle was located at about 2-4 cm below the medial arcuate ligament of the diaphragm in the space between the psoas major muscle and inferior vena cava (abdominal aorta) in the anatomical level of space before psoas. The operation of 278 patients was all successfully completed, where renal pedicle was quickly found. It took 3.5±1.3 min to locate the renal pedicle, and 95.6±23.8 min to operate. In retroperitoneoscopic...
Tipo: Journal article
Palavras-chave: Laparoscopy; Nephrectomy; Anatomy; Retroperitoneoscopy.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400001

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

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

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

Estudio Biométrico de la Arterias Femoral, Poplítea y Tibial Posterior en Relación a los Implantes de Stents
Provedor de dados: 77
Autores: Costa Filho, E,Moreira da; dos Santos, T. F,Avelino; dos Santos, F. T,Avelino; Pereira, V,Honorato; Pitta, G. B,Brandão; del Sol,M; Olave,E; Sousa-Rodrigues,C. F.
Los aneurismas de la arteria poplítea son los más frecuentes entre los aneurismas periféricos, pudiendo ser tratados con stents a través de cirugía endovascular. Sin embargo, tales stents poseen el mismo diámetro en la parte proximal y distal, no siendo compatible con la anatomía vascular de ese segmento. El objetivo del presente estudio fue determinar la diferencia entre el diámetro del tercio distal de la arteria femoral y el diámetro de la arteria tibial posterior, además de obtener el diámetro de otras arterias del miembro inferior. Se utilizaron 28 cadáveres formolizados de individuos adultos, de ambos sexos, los que fueron disecados en la región correspondiente. Los diámetros registrados fueron los siguientes: en el tercio distal de la arteria...
Tipo: Journal article
Palavras-chave: Anatomía; Miembro inferior; Arterias.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200044

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

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

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

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

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

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

RENAL MORPHOMETRY OF FETUSES RATS TREATED WITH CADMIUM
Provedor de dados: 77
Autores: Roman,T. R. N.; de Lima,E. G.; Azoubel,R; Batigália,F.
Cadmium is a heavy metal which is found in the soil, air and food. It is present in everyday life and currently it is being implicated as a toxic, teratogenic and carcinogenic agent. It causes lesions to several organs of humans and animals alike. This work aims to investigate the toxic effects on fetuses of dams exposed to cadmium chloride treatment. Ten pregnant rats were divided into two groups. Five rats, the study group, received an intraperitoneal administration of cadmium chloride at 5 mg/Kg body weight on the 10th day of pregnancy and the other five, the study group, received a solution of 0.85% sodium chloride at the same dose and at the same application site. The fetuses together with the placentas and umbilical cords were collected on the 20th...
Tipo: Journal article
Palavras-chave: Cadmium; Nephrotoxicity; Karyometry.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000300010

Variaciones Musculares del Cuello: Fascículo Accesorio del Músculo Elevador de la Escápula
Provedor de dados: 77
Autores: Tiznado,G; Bucarey,S; Hipp,J; Olave,E.
El músculo elevador de la escápula ha sido descrito como un músculo plano conformado por fascículos que se originan en los procesos transversos de C1 a C4. Sin embargo, se han descrito variaciones anatómicas de este músculo, que incluyen a sus fascículos vertebrales, orígenes en la cabeza o terminando en músculos vecinos a su inserción usual. Durante la disección rutinaria de un cadáver formolizado de un individuo masculino, chileno, de 75 años de edad, observamos en su lado izquierdo, un fascículo accesorio del músculo elevador de la escápula, el cual tenía su origen en la vértebra C5 y terminaba en la fascia del músculo serrato anterior. En ambos lados el músculo elevador de la escápula provino de las vértebras C1-C4. El fascículo accesorio se originó...
Tipo: Journal article
Palavras-chave: Anatomía; Músculos; Músculo elevador de la escápula; Variación anatómica.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200005

El Cambio de Forma del Músculo Aductor Hallux y el Hallux Valgus
Provedor de dados: 77
Autores: Vasconcellos,Henrique Ayres de; Cavalcante,Mey Lie Tan Maia de Holanda; Ferreira,Ítalo Guariz; Frango,Álvaro Oliveira Rodrigues; Siqueira,Camila Ornellas; Galvão,João Amaral.
El desempeño de los pies influye en la postura, marcha y en el uso de calzados. Deformidades pueden surgir debido a alteraciones estructurales provocadas por el desequilibrio muscular como parece suceder en el hallux valgus (HV). El Músculo aductor del hallux (MAH) es considerado importante en la presencia de ese desequilibrio. Analisamos la acción del MAH, en la dinámica del hallux y del antepie sano, así como en la génesis del HV. Se disecaron 28 pies aislados (3 com HV), fijados en formol, del Laboratorio de Anatomía de la Facultad de Medicina de Petrópolis/FASE/RJ para obtener los datos morfométricos del MAH: largo de las cabezas (L-CT; L-CO); ancho de las cabezas (A-CT; A-CO) y ángulo entre las cabezas (q). Los valores medios (mm), obtenidos en los...
Tipo: Journal article
Palavras-chave: Músculo aductor del hallux; Hallux valgus; Anatomía del Pie; Deformidad del Pie.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400038

Structure and Histophysiological Considerations on the Arterial Wall of the Dog
Provedor de dados: 77
Autores: Orsi,Antonio M; Domeniconi,Raquel F; Mello,Josiane M. de; Spilla,Caio S. G.
This paper described the architecture of the dog aortic arterial wall focused in the ascendant; thoracic descendent, and abdominal parts of the aorta. Furthermore, in this study we analyzed the wall structure of the right external iliac artery and the left vertebral artery of dog aiming to compare their architectural patterns with the aortic wall mainly in abdominal aortic part, which was structured by a mixed muscular and connective matrix equilibrated elements. The variables analyzed were the thickness of each mural layer; the number of elastic lamellae, mainly localized into the medial layer structure, and the diameters of each aortic segment. The aortic structure showed a typical elastic pattern in the ascendant and descendant thoracic parts, but in...
Tipo: Journal article
Palavras-chave: Artery; Mural structure; Histophysiology; Dog.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300013

Proximal Femoral Epiphysis Anatomy in Chilean Population: Orthopedic and Forensic Aspects
Provedor de dados: 77
Autores: Osorio,Horacio; Schorwer,Karl; Coronado,César; Delgado,Javier; Aravena,Pedro.
From a biomechanical standpoint, bone geometry and density are factors correlated to the bone resistance of the femur when supporting body weight, with geometric parameters like the diameter of the femoral head and neck, the length of the femoral neck, and the femoral neck angle as determinant factors in the incidence of hip fractures, which increase in frequency and seriousness in osteoporotic patients. In Chile, morphometric data that contributes to relating the anatomy of the proximal epiphysis of the femur as an associated factor in hip fractures does not exist; likewise, there are no anthropometric indexes that may contribute to the forensic sciences. The purpose of this study is to establish average measurements of the proximal epiphysis of the femur...
Tipo: Journal article
Palavras-chave: Anatomy; Femur head; Femur neck; Hip fractures.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100046

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

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

Effect of Zearalenone Administrated at Late Gestation Days on Fertility of The F-1 Offspring in Swiss webster (Mus musculus)
Provedor de dados: 77
Autores: Irnidayanti,Yulia.
Zearalenonesolution was given to dams micesubcutaneouslyat a dose of30 mg/kg body weightat the age ofpregnancy 13 to 18 days.Control micewere given only sesameoil. Furthermore, damsmice were allowed todeliver their litter and pups were weanedon 21 days of age. The live birth index andviability of the F-1 offspring were recorded. Determination of fertility of the F-1 offspring were undertaken by mating interlitters. On days 18 of gestation, the F-1 offspring were killed by cervical dislocation. The observation was performed on the number of live or dead fetus, embryo resorption, the number of implantation and the percentage of gestation loss. The result revealed that administration of zearalenone on days 13 to 18 of gestation caused a significant decreasein...
Tipo: Journal article
Palavras-chave: Zearalenone; Fertilitas indeks; Gestation indeks; Number of implantation; Persistent.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300068

Relaciones del Plexo Braquial con la Segunda Parte de la Arteria Axilar
Provedor de dados: 77
Autores: Buarque de Gusmão,Luiz Carlos; de Sousa Rodrigues,Célio Fernando; Vergetti Malta,Moana; Santos,Klebiana; Maia Loureiro,Luiz Victor; Luz Machado,Maria Helena; Coutinho Malheiros,ablo; Santana Santos,Shyrlene; Pereira Neto,Ulisses Vitor; Gomes Falcão Almeida,Yara.
Analizamos 62 axilas, 32 derechas y 30 izquierdas de cadáveres humanos, con el objetivo de hacer un estudio detallado de las relaciones topográficas de los cordones del plexo braquial (PB) en relación a la 2 parte de la arteria axilar (Aa) (parte retropectoral de la axila). Notamos que algunos cordones del PB pierden su identidad a lo largo de dicha porción, por este motivo, el análisis de ellos fue hecha en el comienzo de la región retropectoral y se limitó a los casos en que se presentaban al mismo tiempo los tres cordones (36 casos, 58%). Se comprobó que en el 27,42% de los casos, los cordones del PB circundaban la 2 parte de la Aa y estaban situados en conformidad con sus nombres ­ lateral (CL), medial (CM) y posterior (CP) ­ siendo ésta la disposición...
Tipo: Journal article
Palavras-chave: Axila; Arteria axilar; Plexo braquial.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200006

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

Prevalence and Distribution of the Third Coronary Artery in Kenyans
Provedor de dados: 77
Autores: OLABU,B. O; SAIDI,H. S; HASSANALI,J; OGENG'O,J. A.
A third coronary artery (TCA) has been defined as a direct branch from the right aortic sinus (RAS) that contributes to the vascularization of the infundibulum of the right ventricle (RV). The distribution of this artery may be important in surgical procedures and in understanding the extent and progression of acute myocardial infarction. Its reported prevalence however shows ethnic disparity. The aim of the study was describe the prevalence and distribution of the third coronary artery in a Kenyan population. 148 cadaveric and postmortem human adult hearts obtained from the Department of Human Anatomy, University of Nairobi, and the Chiromo and Nairobi city mortuaries were used after an ethical approval. The hearts were studied by gross dissection for the...
Tipo: Journal article
Palavras-chave: Third coronary artery; Prevalence; Distribution; Kenyans.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400027

Reparación Ósea Utilizando Sulfato de Calcio en Defectos Óseos de Tibia de Conejos
Provedor de dados: 77
Autores: de Oliveira,Marila; Olate,Sergio; Pozzer,Leandro; Vásquez,Bélgica; Cantín,Mario; Albergaría-Barbosa,José Ricardo de.
La regeneración ósea en reconstrucción del proceso alveolar junto al uso de implantes oseointegrables son ampliamente utilizados, existiendo una amplia variabilidad de productos. El objetivo de esta investigación es estudiar la reparación ósea asociada a un sustituto óseo a base de sulfato de calcio cubierto con membrana biológica en defectos creados en tibia de conejos. Se seleccionaron 12 conejos de entre 3 y 6 meses para ser intervenidos; de acuerdo a protocolos de anestesia ya conocidos se realizó la técnica con acceso a ambas tibias donde se realizaron 2 defectos de 2,6 mm de diámetro; se formaron cuatro grupos siendo el grupo I de relleno con coágulo sanguíneo, grupo II relleno con coagulo cubierto con membrana de colágeno, grupo III relleno con...
Tipo: Journal article
Palavras-chave: Biomaterial; Injerto óseo; Relleno óseo.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400055

Instructions for the Use of MInCiR Scale to Assess Methodological Quality in Prognosis Studies
Provedor de dados: 77
Autores: Manterola,Carlos; Cartes-Velasquez,Ricardo; Otzen,Tamara.
The assessment of methodological quality (MQ) in biomedical research is an area of dynamic development over recent years globally. Understood as a complex and multidimensional construct, several groups have been proposed tools for its evaluation, between them our group has designed and validated scales to assess MQ in therapy, diagnosis and prognosis studies. However, as with other instruments, it is necessary to specify in detail how the measurement is performed. The aim of this article is to provide a guideline for the standardized application of MInCir MQ scale for prognosis studies. A detailed description of the 11 items and 4 domains of the scale, indicating for each of them how to assess and rate the characteristics in primary prognosis articles is...
Tipo: Journal article
Palavras-chave: Investigative Techniques; Methods/epidemiology; Methodological studies; Prognosis; Evaluation Studies as Topic; Epidemiologic Studies; Evidence-Based Medicine.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400059

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

Multidisciplinary Approach in the Teaching of Dental Sculpture and Anatomy
Provedor de dados: 77
Autores: Buchaim,Rogério Leone; Andreo,Jesus Carlos; Rodrigues,Antonio de Castro; Gonçalves,Jéssica Barbosa de Oliveira; Daré,Letícia Rossi; Rosa Júnior,Geraldo Marco; Buchaim,Daniela Vieira; de Oliveira,José Américo.
The purpose of the Dental Sculpture and Anatomy discipline is to introduce undergraduate students to the study of the anatomic and morphological characteristics of permanent and primary human dentition, through classes, books and cognitive and psychomotor activities. This discipline supports the teaching of specific knowledge necessary for a more extensive education, involving interdisciplinarity as a means of knowledge exchange among several areas of dentistry, to achieve comprehensive professional education. Students must recognize the dental morphology from samples of preserved teeth, and reproduce the morphology through three-dimensional models made of stone or wax blocks. In this article, the authors describe the process for producing teeth collars...
Tipo: Journal article
Palavras-chave: Dental anatomy; Education methods; Undergraduate students; Basic sciences.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200002

The Cytogenetic Examination as a Tool for the Diagnosis of Chromosomal Disorders
Provedor de dados: 77
Autores: Miziara,R. C; Marques,S. B. S; Marques,J. H. S; Rezende,C; Aquino,R; Cury Rodrigues,V; Azoubel,R.
Clinically significant chromosomal abnormalities occur in about 1% of children born alive. The objective of this work was to offer the patients and the families in the community for the service of the Integrated Clinic of Uniara Health (Araraquara and region), the examination of cariotype (cytogenetic study) for confirmation or exclusion of the diagnostic suspicion of chromosomal abnormalities as well as information (genetic counseling) for the prevention of occurrence and/or recurrence of these anomalies. In the period of one year and four months these were carried out in the Integrated Clinic of Uniara Health and directed for the Laboratory of Cytogenetic Human of the same institution in 66 cytogenetic studies. In 44 patients (66.6%) the results were...
Tipo: Journal article
Palavras-chave: Cytogenetic studies; Chromosomal abnormalities; Genetic counseling.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100009

Índices Faciales en Individuos Mapuche
Provedor de dados: 77
Autores: del Sol,Mariano.
El grupo étnico mapuche se distribuye principalmente en la IX Región de Chile, estando más aislados de centros urbanos aquellos individuos que viven en sectores del litoral de la Región. Numerosos aspectos, entre los que se destacan los étnicos determinan la forma de la cabeza y de la cara y por tanto de sus índices. Se realizó un estudio antropométrico en 50 individuos adultos, de sexo masculino, del grupo étnico mapuche, de reducciones de la zona costera de la IX Región de Chile. En ellos se midieron diámetros faciales y se determinaron sus índices. El diámetro nasiognation promedio fue de 123,1 mm (DS 6,6), con límites superior de 147mm e inferior de 105mm. El diámetro nasioalveolar promedio fue de 67,6 mm (DS 4,1), con límites superior de 75mm e...
Tipo: Journal article
Palavras-chave: Índice facial; Grupo étnico Mapuche; Chile; Chile.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500012

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

Study of Prevalence of Internal Resorption in Periapical Radiography of Anteriors Permanents Tooth
Provedor de dados: 77
Autores: Araújo,Lorena Cássia Gueiros de; Lins,Carol Vasconcelos; Lima,Georgina Agnelo de; Travassos,Rosana Maria Coelho; Lins,Carla Cabral dos Santos Accioly.
The aim of this study was to evaluate, by the use of clinical and radiographic records, the prevalence of internal resorption in anterior permanent teeth of patients from the Clinic of Specialization in Endodontics of Federal University of Pernambuco, Brazil; related to the period of September of 2001 to June of 2007. 888 medical records from the archives of the clinic were analyzed. Among them 232 referred to anterior teeth. The presence and the location of the resorption were radiographically observed. The obtained results verified that the internal resorption was prevalent in 2.16% of the cases, with 0.86% located in coronal region, 0.44% in root region and 0.86% in both regions. We concluded that, despite of being a pathology of low incidence, the...
Tipo: Journal article
Palavras-chave: Endodontics; Dental resorption; Prevalence.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100038

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

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

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

Tratamiento con Ultrasonido Continuo de Alta Intensidad en Nervios Isquiáticos de Rata (Sprague Dawley) Lesionados por Compresión
Provedor de dados: 77
Autores: Farfán,Emilio; Matamala,Fernando.
Actualmente las patologías compresivas de nervios espinales son de alta incidencia. Como una forma de contribuir con fundamentos morfológicos a la aplicación de ultrasonido terapéutico se realizó la presente experiencia, que se refiere a la reparación de los nervios espinales luego de una injuria compresiva. Para esto se utilizaron 9 ratas Sprague Dawley las cuales fueron separadas en tres grupos con 3 ratas cada uno: A) control sano, B) control lesionado y C) aplicación de ultrasonido terapéutico de 1w/cm2. Las ratas de los grupos B y C fueron anestesiadas y se les aisló quirúrgicamente el nervio isquiático, el cual fue pinzado durante 45 segundos con una fuerza constante de 40N. La compresión se realizó a 10mm sobre su bifurcación distal, luego se...
Tipo: Journal article
Palavras-chave: Nervio isquiático de rata; Neuropraxia; Ultrasonido terapéutico.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300019

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

Microscopic Examination of Placenta of Rats Prenatally Exposed to Aloe barbadensis: A Preliminary Study
Provedor de dados: 77
Autores: Kosif,Rengin; Akta,Gülhan; Öztekin,Aynure.
Aloe barbadensis is the most widely used both commercially and therapeutic properties. It has been used for an array of ailments since ancient times as a medicinal plant. There are more than 360 different species of Aloe. Its products have been used in health foods for medical and preservative purposes. The objective of this study was to search the effects of Aloe barbadensis on the rat's placenta. Gel form of Aloe barbadensis is used in the study. It is commercial, preserved but otherwise untreated form of Aloe Barbadensis gel capsul. Female Wistar Albino rats were divided into three groups. Placenta specimens from each groups were processed for the microscopic examination. Trophoblastic giant cells and spongiotrophoblasts were decreased in number after...
Tipo: Journal article
Palavras-chave: Aloe barbadensis; Effec; Placenta; Microscopic examination.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200005

Morphometric Study of the Rostral Epidural Rete Mirabile in the Dromedary (Camelus dromedarius, Linnaeus 1758)
Provedor de dados: 77
Autores: Jerbi,Hassen; Khaldi,Sana; Pérez,William.
In camels, the rostral epidural rete mirabile had a spongy appearance, and consisted of a dense network of anastomosing arteries occupying the entire cavity of the cavernous sinus. In this study, we measured the length of each rostral epidural rete mirabile lobe, taken between the rostral and the caudal roots dissected in situ before spreading and after reconstitution, and the total length of the rostral epidural rete mirabile after linear reconstitution. The length of the left lobe of the rete was 6.0±0.4 mm and the length of the right lobe was 5.8 ± 0.5 mm. The combined length of the RERM after separation of the arteries was 305.2±9.7 cm. To conclude, we added information to literature in relation to morphometry of the camel RERM and showed this...
Tipo: Journal article
Palavras-chave: Anatomy; Arteries; Brain; Camel; Encephalon; Vascular system.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400042

Normal and Variant Anatomy of Renal Hilar Structures and its Clinical Significance
Provedor de dados: 77
Autores: Trivedi,S; Athavale,S; Kotgiriwar,S.
Advanced imaging techniques have resulted in increasing use of minimally invasive approaches for nephron sparing surgeries of kidney. Need for precise knowledge of normal and variant anatomy of vascular pedicle of kidney is thus justified. Ample literature is available on the variations in the intrarenal vascular pattern of the kidney, which are seen frequently. But the variation in arrangement of structures at the renal hilum has not gained much interest up till now. One hundred (51 right and 49 left) embalmed kidneys were utilized for the present study. Careful dissection of renal hilar structures was carried out to observe antero-posterior relationship of structures at the hilum of the kidney. In majority (73%), the arrangement was not according to the...
Tipo: Journal article
Palavras-chave: Kidney; Laparoscopic partial nephrectomy; Renal hilum; Variations.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400052

Formación del Nervio Sural en Individuos Chilenos
Provedor de dados: 77
Autores: Olave,E; Cruzat,C; Retamal,P; Galaz,C.
La inervación cutánea de la región posterior de la pierna esta dada por el nervio cutáneo sural medial (NCSM), el nervio cutáneo sural lateral (NCSL), el nervio sural (NS) y el nervio safeno. Estos ramos son variables pudiendo los dos primeros, ser independientes o estar unidos y formar el nervio sural. Con el propósito de determinar la formación del nervio sural y los niveles de origen de los nervios NCSM y NCSDL, disecamos 12 piernas formolizadas, 7 izquierdas y 5 derechas, de individuos chilenos, adultos. El punto de origen y unión de los nervios NCSM y NCSL se localizó en relación a una línea transversal trazada entre los puntos más prominentes de los cóndilos femorales (LBE), así como una línea trazada entre los dos maléolos (LBM). La distancia entre...
Tipo: Journal article
Palavras-chave: Anatomía; Inervación; Pierna; Nervio Sural.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100040

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

Relación entre Niveles de Inclusión de Terceros Molares Mandibulares e Índices Antropométricos Físicos de la Mandíbula en Etnias Atacameñas y Aymaras del Norte de Chile
Provedor de dados: 77
Autores: Beltrán Varas,Víctor Javier; Fuentes Fernández,Ramón; Bustos Cortés,Alejandro; Sanhueza Campos,Antonio.
La patología relacionada con el proceso de formación odontogénica, desarrollo y erupción de terceros molares, constituyen uno de los motivos más frecuentes de consulta odontológica. La mayoría de los autores coinciden en que el tercer molar inferior es el diente con mayor frecuencia de inclusión pero existen discrepancias respecto a la influencia de factores ecológicos y raciales que expliquen esa condición. Se sabe que los individuos de un grupo étnico tienen características físicas especiales y esto también se observa a nivel facial de acuerdo a las características del macizo máxilo-mandibular. Esto motivó investigar la relación entre niveles de inclusión de terceros molares mandibulares e índices antropométricos físicos de la mandíbula en grupos étnicos...
Tipo: Journal article
Palavras-chave: Antropología; Odontología; Tercer Molar; Inclusión.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200025

Manifest and Latent Relations between Intracranial Capacity and Cephalofacial Indexes
Provedor de dados: 77
Autores: Rexhepi,Agron M; Brestovci,Behlul.
The goals of this study were to find the average intracranial capacity of the living male-entities of Kosovo Albanian population, to define cephalofacial indexes and their interrelations with intracranial capacity and to explore their latent structure. Eight cephalofacial variables have been measured in 571 male entities of the Kosovo Albanian population, aged 18-35 years old. Of these measurements, 6 cephalofacial indexes and intracranial capacity were calculated. According to the results of Table it can be concluded that most of Albanian males from Kosovo have long, wide and average height head, as well as most of them have brachiocephalic head, low hypsicephalic, and tapeinocephalic head, with intracranial capacity 1379.2cc. Regression Analyzes show...
Tipo: Journal article
Palavras-chave: Brachiocephalic; Regression analyzes; Factorial analyzes; Head volume.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300002

IV Reunión Anual de la Sociedad de Andrología y Gametología de Chile VI Jornadas Internacionales de Verano en Medicina Reproductiva y Biología de la Reproducción I Simposium Internacional de Disfunción Sexual y Eréctil en el varón
Provedor de dados: 77
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000200004

Prevalencia de Alteraciones Posturales en Niños de Arica -Chile. Efectos de un Programa de Mejoramiento de la Postura
Provedor de dados: 77
Autores: Espinoza-Navarro,Omar; Valle,Samuel; Berrios,Gastón; Horta,Javier; Rodríguez,Héctor; Rodríguez,Manuel.
Los objetivos de este trabajo fueron calcular el índice de prevalencia de alteraciones posturales en una muestra de 120 alumnos (10,4% del universo total), de 4 años de edad de la ciudad de Arica y determinar el efecto de un programa de mejoramiento postural. Las alteraciones posturales más frecuentes corresponden a: inclinación de hombros (86%), escápula alada y escápula descendida (82%), proyección anterior de hombros (79%), pie plano (58%), columna lumbar hiperlordótica (51%) e inclinación de cabeza (50%). Posteriormente, se aplicó al grupo experimental un programa de ejercicio muscular y de reeducación postural, por un período de 8 meses. Al final del tratamiento se realizó un análisis post test a todos los sujetos del estudio. Los resultados en el...
Tipo: Journal article
Palavras-chave: Alteraciones posturales; Programa postural; Adaptación neuromuscular.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100004

Seasonal Variations in the Morphometric Characteristics of the Pubertal West African Dwarf Buck in its Native Tropical Environment
Provedor de dados: 77
Autores: Bitto,Immanuel I; Egbunike,Gabriel N.
The effects of season on the morphometric characteristics of the reproductive organs of the pubertal West African Dwarf buck in its native humid tropical environment were investigated. All morphometric characteristics as well as the derivations from both testicular and epididymal morphometry were unaffected by season (p&lt;0.05). There were however, highly significant correlations (p&lt;0.05, p&lt;0.01, p&lt;0.001) between body weight and testicular as well as epididymal morphometry. The results also showed that both testicular and epididymal morphometric characteristics in the pubertal buck are highly predictable from body weight and as such lend ground for the early selection of good sires from records of their growth rate. The non effect of season on...
Tipo: Journal article
Palavras-chave: Season; Pubertal buck; Testicular morphometry; Humid tropics.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500020

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

Localization of Sugar Residues in the Stomach of Three Species of Monkeys (Tupaiidae glis, Nycticebus cocang and Callithrix jacchus) by Lectin Histochemistry
Provedor de dados: 77
Autores: Fayed,Masoud Hassan; Elnasharty,Mohamed; Shoaib,Mahmoud.
The stomach of three species of non-human primates was investigated by lectin histochemistry to clarify the staining affinity and distribution patterns of their sugar residues. All gastric regions, with little differences between the deep and superficial parts of the same region, were rich in. in N-acetylglucosamine and/or neuraminic acid. Although, the superficial regions of the gastric mucosa were scanty in N-acetylgalactosamine, a- D-glucose and a -D-mannose, the deep parts of the gastric mucosa were rich in these sugars. In conclusion, there is a difference among the mucosubstances of surface and foveolar mucous cells, mucous neck cells, and gastric gland cells. This indicates heterogeneous composition of gastric mucus, or mucus molecules with...
Tipo: Journal article
Palavras-chave: Histochemistry; Lectins; Non-human primates; Stomach.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100016

Unusual Topography of Posterior Antebrachial Musculature in the First Osseofibrous Compartment of Wrist: Clinicomorphological Appraisal
Provedor de dados: 77
Autores: Arora,Jyoti; Mehta,Vandana; Suri,Rajesh Kumar; Rath,Gayatri.
Anatomical variations of abductor pollicis longus and extensor pollicis brevis are important in clinical assessment of diseased and traumatized hand. The present case reports an unusual fusion of muscle bellies of abductor pollicis longus and extensor pollicis brevis with two separate tendons of insertion, the medial tendon inserted into the base of first metacarpal and the lateral tendon into the abductor pollicis brevis muscle. Knowledge of such anatomical variations is of utmost importance in the management of De Quervain's disease and reconstructive surgeries of hand.
Tipo: Journal article
Palavras-chave: Abductor pollicis longus; Extensor pollicis brevis; De Quervain's syndrome; Variations.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200060

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

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

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

Estudio Descriptivo de los Accesos Quirúrgicos Utilizados en el Tratamiento de Fracturas del Complejo Zigomático Orbitario
Provedor de dados: 77
Autores: Olate,Sergio; Lima Junior,Sergio Monteiro; Sawazaki,Renato; Moreira,Roger William Fernandes; de Moraes,Marcio.
El objetivo del presente estudio fue evaluar los accesos quirúrgicos utilizados para el abordaje del complejo zigomático orbitario (CZO) y arco zigomático (AZ). Fue diseñado un estudio de tipo retrospectivo, evaluando las fichas clínicas de pacientes atendidos entre el 1 de Abril del año 1999 y el 31 de Diciembre del año 2008. Fueron estudiadas variables sociodemográficas y características de la fractura, tales como presencia de más de una fractura facial y desplazamiento del fragmento óseo. Se realizo un estudio descriptivo de los diferentes accesos quirúrgicos utilizados y cuando fue necesario se estudió la asociación estadística con la prueba chi-cuadrado para variables nominales, estableciendo significancia si p&lt;0,05. Ciento cincuenta y tres...
Tipo: Journal article
Palavras-chave: Trauma maxilofacial; Fractura de zigoma; Accesos quirúrgicos.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200003

Gill and Liver Histopathology in Goodea atripinnis Jordan, Related to Oxidative Stress in Yuriria Lake, Mexico
Provedor de dados: 77
Autores: Ruiz-Picos,R; López-López,E.
In aquatic ecosystems, the complex mixture of pollutants may mediate the formation of free radicals and cause oxidative damage to the biota. Yuriria Lake (a Ramsar site in Central Mexico) receives input of wastewater from its tributaries, agricultural runoff, and municipal discharge. We studied the lipid peroxidation (LPO), antioxidant enzymes (superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx), and histopathology of gill and liver of the native fish Goodea atripinnis in Yuriria Lake. Results were compared to a control group of fish cultivated in the laboratory. LPO, SOD, and CAT showed no significant differences compared to controls, but GPx showed greater and significant differences in both tissues. Three class sizes were...
Tipo: Journal article
Palavras-chave: Mexican wetlands; Oxidative stress; Histopathology; Fish health condition; Liver; Gill.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300060

Palatal Rugae Patterns of Urhobos in Abraka, South-Southern Nigeria
Provedor de dados: 77
Autores: Eboh,Dennis E. O.
Human identification is a major task undertaken in forensic sciences. Palato-rugoscopy is based on the principle that no two palates are the same. The study of palatine rugae and the study of fingerprints are sometimes complementary as they operate in similar methods based on same scientific basis. The study intends to describe the shape and gender distribution of the palatine rugae and their prevalence in the studied population. The study sample consisted of 84 subjects, 42 males and 42 females of Urhobo ethnic and cultural background, between 17 and 30 years old, with full complement of maxillary teeth, drawn purposively from Abraka. The prevalence of palatal rugae shapes was: line (27.2%), sinuous (21.1%), angle (18.1%), polymorphhic (15.5%), point...
Tipo: Journal article
Palavras-chave: Forensic anthropology; Palatal ruguscopy; Human identification; Morphology.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200059

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

Morphology of the Middle Ear in Three Species of Armadillos (Dasypodidae, Xenarthra) from Argentina
Provedor de dados: 77
Autores: Sidorkewicj,Nora S; Casanave,Emma B.
Middle ears of adult Chaetophractus villosus, C. vellerosus and Zaedyus pichiy were studied for qualitative and quantitative comparisons. A great similarity in the overall shape of the middle ear structures was observed in the three species. The well-developed auditory bulla was formed by the intimate fusion of the tympanic and entotympanic. Internally, a recessus meatus and a wide epitympanic recess extending dorsally into an epitympanic sinus were recognized. The petrosal promontorium, nearly triangular, was the most salient feature in the tympanic cavity. The auditory ossicles corresponded to the transitional middle ear type. The m. tensor tympani and the m. stapedius were conspicuous. The lack of a stapedial artery was confirmed in all cases. The...
Tipo: Journal article
Palavras-chave: Chaetophractus villosus; Chaetophractus vellerosus; Zaedyus pichiy; Fossorial; Middle ear.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400038

Feathered Fibres of Human Soleus Muscle
Provedor de dados: 77
Autores: Joshi,S. S; Joshi,S. D; Kishve,P. S.
The large size of superficial group of muscles of back of leg is a characteristic feature of the musculature of man being related directly to its erect posture and mode of progression. Triceps surae is one of the powerful muscles of the body after Gluteus maximus and Quadriceps femoris. To make the muscle more powerful nature has devised a unique method of packing the fibers in a small space by pennation. There exists a bipenniform mass as a peculiarly human feature. Its feathered fasciculi arise from the deep (anterior) surface of the soleus muscle. Most of the textbooks of Anatomy and the available literature on the triceps surae or the tendoachillis do not appreciate and describe this fascinating aspect of the muscle. It was Schafer et al. (1923) who...
Tipo: Journal article
Palavras-chave: Soleus muscle; Triceps surae muscle; Bipennate fibres.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000100034

Microscopía Electrónica de Nucleos Hepáticos Estimulados con Dosis Crecientes de Laser Infrarrojo
Provedor de dados: 77
Autores: Cornejo,R; Garrido,O; Jaramillo,R.
Un total de 20 ratas hembras de 4 meses de vida con peso aproximado de 250 gramos fueron divididas en 4 grupos de animales rotulados como A, B, C y D. El grupo A corresponde al control y los demás grupos recibieron respectivamente estimulaciones con laser infrarrojo con dosis crecientes de 4, 8 y 16 Joules por cm2 durante 15 días consecutivos en 5 puntos del hígado. Posteriormente las ratas fueron sacrificadas y se extrajeron muestras tanto de hígado control como de los estimulados con inducciones infrarrojas para enseguida ser procesadas para microscopía electrónica de transmisión. De los hepatocitos se obtuvieron microfotografías electrónicas de transmisión con aumentos finales de 9.500 X, las cuales fueron sometidas a estudios morfométricos para...
Tipo: Journal article
Palavras-chave: Láser; Morfometría; Hepatocito; Núcleos.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100035

Histopathological and Histometrical Assessment of Boron Exposure Effects on Mouse Spermatogenesis
Provedor de dados: 77
Autores: Bustos-Obregon,E; Carvallo,M; Hartley-Belmar,R; Sarabia,L; Ponce,C.
Boron is a chemical element widely used in many industrial activities. Exposure to it affects many organs in mammals, mainly reproductive male organs. This work evaluates boron effect in testis. For this purpose, 12mg Boron/L of drinking water, equivalent to Arica tap water, was given for 42 days to 85 days old CFl male mice (experimental group). Another group (control group) drunk tap water of Santiago (0.6mg Boron/L) was used. Testicular histopathology and morphometric analysis was done. These studies showed that Borum induces alterations such as epithelial vacuolization, blockage of the tubular lumen and atrophy. Morphometrical data showed that Borom induces also enlargement of tubular diameter, epithelial height and tubular lumen. Therefore, it is...
Tipo: Journal article
Palavras-chave: Boron; Testicular histopathology; Morphometry; Mouse spermatogenesis.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400039

Muscle Response to the Association of Statin and Physical Exercise in Rats
Provedor de dados: 77
Autores: Bonfim,Mariana Rotta; Camargo Filho,José Carlos Silva; Vanderlei,Luiz Carlos Marques; Padulla,Susimary Aparecida Trevizan; Accioly,Marilita Falângola; Souza,Dorotéia Rossi Silva; Azoubel,Reinaldo.
Physical exercise and statins, which are recommended for the treatment of dyslipidemia, are independently associated to the occurrence of muscle injury. The objective is analyze the effect of aerobic exercise associated to the use of simvastatin on the morphology of the gastrocnemius muscle. Thirty Wistar rats were divided into six groups, two of which received a standard diet (1 sedentary and 1 exercised) and four (1 sedentary with medication, 1 sedentary without medication, 1 exercised with medication, 1 exercised without medication) received a hypercholesterolemic diet (standard diet with the addition of cholesterol and coconut oil). Simvastatin (20 mg/Kg) was administered five days a week for eight weeks, together with aerobic training on a treadmill...
Tipo: Journal article
Palavras-chave: Hydroxymethylglutaryl-CoA Reductase Inhibitors; Exercise; Skeletal Muscle.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400031

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

Interparietal Bone Variations in Accordance with their Ossification Centres in Human Skulls
Provedor de dados: 77
Autores: Khan,Aaijaz Ahmed; Ullah,Muzammil; Asari,Mohd. Asnizam; Hassan,Asma.
The upper interparietal segment of the squamous part of the occipital bone develops in membrane and the lower supraoccipital part develops in cartilage. According to the available literature, the interparietal segment is ossified from 2 to 3 pairs of ossification centres and each of these centres has 2 nuclei. Interparietal bone is formed due to failure of fusion of these centres and/or their nuclei with each other. Many variations of interparietal bone have been reported by many investigators. In the present study, out of 25 human skulls studied, six skulls had some interesting variations of interparietal bones. Four interparietal bones were found in one skull, 2 interparietal bones were observed in another skull and the remaining four skulls had a single...
Tipo: Journal article
Palavras-chave: Centre; Interparietal; Occipital bone; Ossification; Skull.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200031

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

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

Inervación de las Regiones Escapular, Braquial y Antebraquial de la Llama (Lama glama)
Provedor de dados: 77
Autores: Arzone,Carlos A; Genoud,Pablo; Pellegrino,Fernando C; Vidal Figueredo,Ramiro J.
La llama (Lama glama) es un mamífero cuya producción ha crecido exponencialmente en las últimas décadas, sobre todo en la región noroeste y patagónica de Argentina, Chile, Bolivia y Perú. Asociada a este crecimiento, la clínica médica veterinaria ha tenido que enfrentarse con el desafío de nuevos diagnósticos neuroanatómicos, así como también con maniobras semiológicas y quirúrgicas específicas para esta especie. El objetivo del presente trabajo es realizar una detallada descripción de la inervación de las regiones de la espalda, el brazo y el antebrazo, aportando conocimientos que sean de utilidad para que el veterinario clínico pueda interpretar alteraciones funcionales o para la realización de tratamientos quirúrgicos, terapéuticos y/o diagnósticos. Se...
Tipo: Journal article
Palavras-chave: Lama; Inervación del miembro torácico; Relaciones musculares; Relaciones vasculares.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300032

EVALUATION OF THE IMPLANTATION IN PINEALECTOMIZED AND/OR SUBMITTED TO THE CONSTANT ILLUMINATION RATS
Provedor de dados: 77
Autores: Coelho Teixeira,Álvaro Aguiar; Simões,Manuel de Jesus; Wanderley Teixeira,Valéria; Soares Júnior,José Maria.
In this paper we evaluated the morphologic and quantitative aspects of the implantations sites in uteruses of female pinealectomized and/or submitted to the constant illumination rats. The experimental groups were: I - normal female rats maintained in a clear/dark cycle of 12/12 hours, for two months, mated and euthanasiated in the 6th day of pregnancy (control); II - female sham-pinealectomized rats maintained in a clear/dark cycle of 12/12 hours, for two months, mated and euthanasiated in the 6th day of pregnancy (control); III - female pinealectomized rats, maintained in a clear/dark cycle of 12/12 hours, for two months, mated and euthanasiated in the 6th day of pregnancy; IV - normal female rats maintained in constant illumination for two months, mated...
Tipo: Journal article
Palavras-chave: Pinealectomy; Constant illumination; Implantation; Blastocyst.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000300003

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

The Localization of the Asterion According to the Anatomical Landmarks of Posterior Cranial Fossa in Newborns: Clinical Implications
Provedor de dados: 77
Autores: Demir,Mehmet T; Kopuz,Cem; Pirzirenli,Mennan Ece Aydin; Çelik,Fahrettin; Çorumlu,Ufuk.
The purpose of this study was to determine the localization of the asterion according to the anatomical landmarks of posterior cranial fossa and its relation with sinuses for posterolateral surgical approaches in newborns. On 70 head-halves, a needle about 2 mm with diameter was placed on the centre point of asterion (posterolateral fontanel) by inserting into the whole cranial bony tissue by forming an right angle with the bony surface. Various localizations of asterion and its measurements from the internal and external anatomical landmarks were investigated on term neonatal cadavers. The localization of asterion was found as on the sigmoid-transverse sinus junction (STJ) (5., 6., 7., 8. squares) in 40% of cases on right side and in 34%, on left side....
Tipo: Journal article
Palavras-chave: Asterion; Sigmoid sinus; Transverse sinus; Retrosigmoidal approach; Anatomy; Newborn; Posterior cranial fossa.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200043

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

Gamma Radiation-induced Impairment of Hippocampal Neurogenesis,Comparison of Single and Fractionated Dose Regimens
Provedor de dados: 77
Autores: Khoshbin khoshnazar,A. R; Jahanshahi,M; Azami,N. S.
Radiation therapy of the brain is associated with many consequences, including cognitive disorders. Pathogenesis of radiation induced cognitive disorder is not clear, but reduction of neurogenesis in hippocampus may be an underlying reason. 24 adult male rats entered to study. Radiation absorbed dose to midbrain was 10 Gy, delivered by routine cobalt radiotherapy machine which its output was measured 115.24 cGy/min. The rats were divided in four groups of sixes, including groups of control, single fraction 10 Gy, fractionated 10 Gy and finally anaesthesia sham group. Number of pyramidal nerve cells was counted in two regions of hippocampus formation (CA1 and CA3). The radiation could reduce the number of cells in two regions of hippocampus significantly...
Tipo: Journal article
Palavras-chave: Hippocampus; Neurogenesis; Radiation; Fractionation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100026

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

Transmission Electron Microscopy of the Gastrointestinal Tract of Nile Perch Lates niloticus
Provedor de dados: 77
Autores: Namulawa,V. T; Kato,C. D; Nyatia,E; Rutaisire,J; Britz,P. J.
The ultrastructure of the gastrointestinal tract of Nile perch was described using Transmission Electron Microscopy standard procedures. Investigations revealed the presence of mucous cells, blood vessels and oil droplets plus several nerve cells and muscle bundles in the oral cavity. Further observations revealed columnar epithelial cells in the oesophagus, with a ragged surface, high electron dense cytoplasm, intercellular spaces, mitochondria and mucus granules. The lamina propria of the oesophagus was composed of loose connective tissue, blood vessels, nerve cells and several leucocytes, while the muscularis externa was composed of striated muscle bundles with the a Z line, A band and I band. The stomach was characterized by mucosal glandular cells...
Tipo: Journal article
Palavras-chave: Ultrastructure; Gastrointestinal tract; Nile perch.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200053

Estudio Morfológico de la Retina de Salmones (Salmo salar)
Provedor de dados: 77
Autores: Pellón,Mario; Rojas,Mariana; Yaikin,Pabla; del Sol,Mariano.
La retina de peces teleósteos como pez cebra, se ha transformado en un importante modelo para el estudio de la plasticidad neuronal y la neurogénesis. Se ha demostrado además que la retina experimenta cambios ontogenéticos para adaptarse a distintos medios ambientes durante su vida. Este estudio tiene como objetivo describir el desarrollo ontogenético de la retina del alevín de salmón desde la eclosión hasta la fase de juvenil. Se trabajó con 30 salmones divididos en tres grupos de 10. Grupo I: recién eclosionados, con saco vitelino y 18 mm de longitud. Grupo II: sin saco vitelino y 30 mm de longitud. Grupo III: 100 mm de longitud. Cinco alevinesde cada grupo fueron procesados según el protocolo de Hanken &amp;amp; Wassersug para medir los diámetros...
Tipo: Journal article
Palavras-chave: Retina; Ojo; Alevín; Peces teleósteos; Salmón; Desarrollo.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200058

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

Plastinación y Descripción Anatómica de Hígado, Bazo, Estómago y Riñones del Delfín Nariz de Botella (Tursiops truncatus)
Provedor de dados: 77
Autores: Sánchez Fabila,Gabriela; Contreras Villanueva,María Dolores; Moreno Colín,Roberto.
Se plastinaron y describieron cuatro diferentes órganos internos de delfín nariz de botella (Tursiops truncatus) obteniendo modelos didácticos, perdurables gracias a la técnica de plastinación realizada en ellos, haciéndolos inodoros, no tóxicos y manipulables que permiten el estudio de los órganos internos como son el estómago, riñones e hígado de T. truncatus, contribuyendo a los trabajos de anatomía no patológica en delfines que son de importancia ecológica, turística y económica para nuestro país. Las descripciones anatómicas permiten avanzar en el conocimiento sobre los órganos internos, y si bien es cierto que se ha realizado un esfuerzo por estudiarlos existen pocos trabajos anatómicos realizados en ellos. Siendo este artículo una contribución al...
Tipo: Journal article
Palavras-chave: Plastinación; Delphinidae; Nariz de botella; Órganos; Descripción.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200036

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

Estudio Morfométrico del Hígado de Ratón en la Enfermedad de Chagas Experimental
Provedor de dados: 77
Autores: Ragonha,Louise Helena Olhan; Abrahão,Ana Amélia Carraro; Sala,Miguel Angel; Lopes,Ruberval A.; Ribeiro,Rosa Domingues; Prado Jr.,José Clovis do; Albuquerque,Sérgio de; Zucoloto,Sérgio.
El objetivo de este trabajo fue caracterizar histopatológicamente y morfométricamente las alteraciones del tejido hepático de ratón, durante la fase aguda de la infección por la cepa MORC-2 de Trypanosoma cruzi. Esta cepa mostró acentuado tropismo por el hígado, con numerosos nidos de amastigotes en los cortes examinados. El hígado de los animales infectados estaba constituido por células menores, con citoplasma granuloso. En algunas áreas, los sinusoides estaban congestionados y las células de Kupffer hipertróficas e hiperplásicas. El tejido hepático mostró focos circunscritos de células inflamatorias en áreas de necrosis, sinusoides, en torno de las venas centrolobulillares y de los espacios porta. La vena centrolobulillar estaba dilatada y...
Tipo: Journal article
Palavras-chave: Morfometría; Histopatología; Hígado; Ratón; Trypanosoma cruzi; Cepa MORC-2.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400015

Influencia de Dientes Remanentes en la Presencia y Morfometría de Forámenes y Canales en Relación a las Espinas Mentales
Provedor de dados: 77
Autores: Cáceres,Felipe; Ramírez,Valeria; Soto,Reinaldo.
La zona anterior de la mandíbula, con frecuencia es intervenida desde el punto de vista quirúrgico (instalación de implantes oseointegrados, mentoplastias, genioplastias, profundizaciones de vestíbulo y flanco lingual, fracturas, etc.). Se ha descrito la presencia de vasos que penetran la tabla ósea lingual en la zona mediana mandibular, los cuales se relacionan con forámenes vasculares. La pérdida dentaria en la zona anterior mandibular podría influir en el tamaño de los forámenes y canales debido a la degeneración de los vasos incisivos provenientes de la arteria alveolar inferior. El objetivo fue evaluar la relación entre presencia y ausencia de dientes remanentes en el grupo V con la presencia y morfometría de forámenes y canales ubicados en cercanía a...
Tipo: Journal article
Palavras-chave: Foramen lingual; Canal lingual; Espinas mentales.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100018

Effect of Resveratrol on Mitochondrial Activity in Differentiated Mature Adipocytes
Provedor de dados: 77
Autores: Noriega-González,J. E; Chirino,Y. I; Mata-Miranda,M. M; Vázquez-Zapién,G. J; Sánchez-Monroy,V.
Obesity has reached epidemic proportions, the World Health Organization (WHO) estimates that there are more than 1,000 million overweight adults world-wide. Furthermore, obesity is characterized as an overgrowth of white adipose tissue as a result of adipocyte hypertrophy and hyperplasia. Mitochondria is considered the source of energy within the adipocyte, since it contains the molecular machinery, and it is involved in a large number of metabolic pathways, besides the transformation of chemical energy into adenosine triphosphate. Mitochondria shortage and adipocyte dysfunction result in an excessive accumulation of triacylglycerol in the cytoplasm, which determines an imbalance between energy production and energy expenditure. Resveratrol (RSV) is a...
Tipo: Journal article
Palavras-chave: Preadipocytes; Differentiated mature adipocyte; Mitochondrial activity; Resveratrol.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300044

Evaluación de la Percepción del Proceso de Enseñanza y Aprendizaje de un Curso de Morfología Humana por parte de Estudiantes de un Programa para Talentos Académicos
Provedor de dados: 77
Autores: Olivares,Rossy; Henríquez,Ricardo; Simpson,Cristina; Binvignat,Octavio; González,Marcela; Conejeros,Leonor; Merino,Cristian; Lizana Arce,Pablo.
La alta capacidad intelectual se considera una manifestación diferencial del desarrollo cognitivo, siendo la estimulación temprana y sistemática favorecedores de su expresión y desarrollo. Es por ello, que otorgar oportunidades educativas enriquecidas es central para los los niños y niñas con talentos académicos. Esta investigación evalúa la percepción de los estudiantes frente a una metodología de enseñanza teórico-práctica en un curso dirigido a talentos académicos de enseñanza media (n=17) en el área de morfología humana. Los estudiantes formaron parte de un programa universitario de enriquecimiento extracurricular. Al final del periodo los estudiantes evaluaron los cursos mediante una encuesta referida a: i) el curso ii) el profesor, y iii)...
Tipo: Journal article
Palavras-chave: Talento Académico; Proceso de Enseñanza y Aprendizaje; Morfología humana.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100024

Estudio Morfométrico del Efecto de Láser Infrarrojo 16 J/cm2 sobre Hepatocitos de Rata
Provedor de dados: 77
Autores: Cornejo Uribe,Ricardo; Matamala Vargas,Fernando; Silva Mella,Héctor; Garrido Oñate,Orlando; Abarzúa Bastías,Yasna; Balboa Ponce,Natalia.
Hígados de ratas Sprague Dawley fueron irradiados durante 15 días con dosis diarias de 8 y 16 J/cm2 proveniente del láser AsGa equivalente a 904 nm. De estos animales previamente anestesiados, fueron quirúrgicamente obtenidas muestras de hígado y posteriormente procesadas para microscopía electrónica de transmisión, siendo estudiadas y sometidas a técnicas morfométricas utilizando aumentos de 8.500 X con especial énfasis en cuantificar fracciones volumétricas de componentes celulares. El análisis de los resultados entre hepatocitos irradiados con dosis de 8 y 16 J/cm2 revela que existen marcadas diferencias entre las fracciones volumétricas de componentes celulares determinantes de funcionalidad celular e involucrados en síntesis proteica, cuantificación...
Tipo: Journal article
Palavras-chave: Láser infrarrojo; Hepatocitos; Morfometría.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200058

Revisión Anatómica del Músculo Bíceps Femoral del Canino
Provedor de dados: 77
Autores: Arzone,C. A; Blanco,C. J; Genoud,P; Pellegrino,F. C; Sánchez,G; Vidal Figueredo,R. J.
El músculo bíceps femoral (BF) desempeña un rol fundamental en la biomecánica del miembro pelviano de los caninos, actuando en la flexoextensión de la articulación femorotibiorotuliana y la abducción del miembro. La evaluación correcta de su función es importante en la clínica veterinaria. Existen puntos controversiales entre los autores consultados acerca de la morfología de este músculo. El presente estudio tiene como objetivo discutir las distintas descripciones, reparando en las inserciones, la estructura e inervación del músculo. Se han realizado las disecciones bilaterales en 12 animales. La conservación de las piezas se realizó por inmersión en piletas, con una dilución de formol al 10 % y ácido fenico al 4% en agua. Se utilizaron diferentes...
Tipo: Journal article
Palavras-chave: Músculo bíceps femoral; Canino; Estructura anatómica.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400026

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

Effects of Cadmium Chloride on Lymph Node Cells in Rats
Provedor de dados: 77
Autores: Deveci,E; Erdem,E.
Cadmium, hazardous heavy metal, is recognized to produce severe toxic effects in humans. In this study, intestinal wall surrounding the mesenteric lymph nodes, based on the cadmium to be mainly lymphocytes and plasma cells, granulocytes eozinofil examined effects on the immune system were investigated by histochemical and electron microscope. Electron microscope examination of the cross section of cadmium, mitochondria cristae in the cytoplasm of lymphocytes was observed deterioration in the structure and degenerative changes in dilated endoplasmic reticulum,were seen together with elongation, that a small number of multi-focal granular lymphocytes, but plasma cells and eosinophilic granulocytes of the structures of multi-focal granular structures of...
Tipo: Journal article
Palavras-chave: Cadmium chloride; Lymph node; Electron microscope examination.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200043

Hígado: Siete Segmentos Hepáticos
Provedor de dados: 77
Autores: Durand López,César Augusto.
Estudiamos la estructura intrahepática en 200 hígados (A05.8.01.001)* humanos: Las ramas portales, arteriales y biliares formaron siete pedículos segmentarios antes de penetrar en su parénquima correspondiente. Los cuatro primeros pertenecen, generalmente, al lóbulo izquierdo (A05.8.01.027) y los segmentos V, VI y VII al lóbulo derecho (A05.8.01.026). En un 80 % la rama portal V es derecha y en 20 % izquierda; por su parte, en un 80 % la fisura portal principal (A05.8.01.035) divide el lóbulo derecho del izquierdo, extendiéndose desde la fosa de la vesícula biliar (A05.8.01.013) al margen izquierdo de la vena cava inferior (A12.3.09.001); en un 20 % la fisura portal derecha (A05.8.01.036) divide el lóbulo derecho del izquierdo, ella se extiende desde un...
Tipo: Journal article
Palavras-chave: Segmentos hepática; Clasificación.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400055

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

Embryonic Development of Aplodinotus grunniens (Perciforme: Sciaenidae) in Tenosique, Tabasco, Mexico
Provedor de dados: 77
Autores: Hernández-Gómez,Raúl E; Perera-Garcia,Martha A; Valenzuela C,Ignacio; Duran M,Temani; Mendoza-Carranza,Manuel.
The description of the embryonic and larval development was based on 30 eggs and 30 larvae. Breeders were collected on the Usumacinta River, Tabasco, Mexico and were subjected to manual fertilization in May 2011. Fertilized eggs were spherical, pelagic, translucent and non-adhesive and had an average diameter of 1.07 mm (SD = 0.10), showing a concentric lipid droplet of 0.85 mm (SD = 0.02). The embryo occupied 100% of the perivitelline space at hour 14:08 post-fertilization and the egg measured 1.18 mm (SD = 0.14) at this stage. Eclosion started 17 hours post-fertilization when larvae had a length of 2.54 mm (SD = 0.66). Eight preanal and 13 postanal myomeres were observed exhibiting a light brown color. The morphologic characters recorded in this study...
Tipo: Journal article
Palavras-chave: Embryo; Drum; Aplodinotus grunniens; Usumacinta.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200047

Evaluación de la Enseñanza y Aprendizaje por Parte de Estudiantes de un Programa de Talentos Académicos (BETA-PUCV) Frente a un Curso de Neuroanatomía Funcional
Provedor de dados: 77
Autores: Lizana Arce,Pablo José; Almagià Flores,Atilio Aldo; Simpson Lelievre,María Cristina; Binvignat Gutiérrez,Octavio; Henríquez Flores,Ricardo Andrés; Gómez Arízaga,María Paz; González Navarro,Marcela; Conejeros Solar,María Leonor.
El talento académico se presenta en aproximadamente un 6% de la población, y se caracteriza por un destacado desempeño intelectual en algún área específica del conocimiento o en áreas generales. Esta investigación explora la aplicación de un método de enseñanza activo-participativo en el área de la neuroanatomía funcional, a estudiantes con talento académico de cursos de Enseñanza media (n=27), que formaban parte de un programa de enriquecimiento curricular (Programa BETA-PUCV). Este método integra las clases interactivas, la realización de pasos prácticos que incluyen disecciones, la confección de modelos tridimensionales y la preparación de técnicas anatómicas, además de un refuerzo virtual a través del Aula Virtual de Anatomía Humana. Los estudiantes...
Tipo: Journal article
Palavras-chave: Talentos académicos; Enseñanza y aprendizaje; Neuroanatomía.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400041

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

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

Testicular and Epididymal Parameters of Sahel Buck in the Humid Zone of Nigeria
Provedor de dados: 77
Autores: Oyeyemi,M. O; Fayomi,A. P; Adeniji,D. Adejoke; Ojo,K. Mary.
The testicular and epididymal parameters of Sahel bucks in the humid zone of Nigeria was investigated. Twenty goats (30-54 months) weighing 23.48-32.03kg were used for the experiment. The scrotal circumference of the buck was measured. The bucks were then slaughtered and the testicles as well as the epididymides collected. The testicular weight, testicular diameter, testicular length and epididymal length were measured using a non-stretchable measuring tape. These parameters were correlated with one another and the values of the right testis and epididymis were compared with those of the left. The scrotal circumference was positively correlated with the testicular weight (r = 0.769, P&lt;0.01), testicular diameter (r = 0.827, P&lt;0.01), testicular length...
Tipo: Journal article
Palavras-chave: Testicular Parameter; Epididymal Parameter; Scrotal circumference; Reproduction; Sahel bucks.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200021

Toxoplasmosis Sistémica en un Canguro Rojo (Macropus rufus) Cautivo
Provedor de dados: 77
Autores: Ochoa-Amaya,J. E; Ciuoderis-Aponte,K. A; Lim,A; Bolin,S; Langohr,I.
Los objetivos del estudio fueron presentar y documentar los hallazgos histopatológicos de toxoplasmosis sistémica en un canguro rojo (Macropus rufus) mantenido en cautiverio donde se describen los hallazgos macro y microscópicos encontrados y los análisis adicionales realizados. En el laboratorio de histopatología animal (Universidad de los Llanos) se recibieron muestras de tejidos fijados en formol tamponado, al 10% que procedían de un ejemplar macho de Macropus rufus, de ocho años de edad y 50 kg de peso corporal. Las muestras se procesaron mediante métodos rutinarios para microscopía óptica. Los cortes histológicos de 3-4 mm de grosor se colorearon con Hematoxilina-Eosina (H&amp;E) y se realizó en algunos cortes la tinción de Ácido Periódico Schiff...
Tipo: Journal article
Palavras-chave: Canguro; Toxoplasmosis; Taquizoitos; Bradizoitos.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100012

Porcine Uterine and Placental Extracellular Matrix Molecules Throughout Pregnancy
Provedor de dados: 77
Autores: Sanchis,E. G; Cristofolini,A. L; Taglialegna,A; Merkis,C. I.
The molecules that constitute the extracellular matrix are important in several functions related to tissue support and cell-cell, cell-extracellular matrix interaction. Among the macromolecules that constitute the mentioned matrix we find osteopontin, fibrinogen and collagen. The present study was undertaken to analyze the rol of osteopontin, fibrinogen and collagen in uterine-placental interface during normal porcine gestation. Uterine and placental tissues from crossbred gilts of 30 (n=5), 60 (n=5), 70 (n=5) and 114 (at term, n=5) days of gestation were used. Macroscopic analysis of the embryos/fetuses allowed us to determine their gestational age by means of the crown-rump lenght. Haematoxylin-Eosin and Masson's Trichrome dyes along with light...
Tipo: Journal article
Palavras-chave: Pig; Placenta; Osteopontin; Fibrinogen; Collagen.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400062

Effect of Sodium Cyclamate on the Rat Fetal Exocrine Pancreas: a Karyometric and Stereological Study
Provedor de dados: 77
Autores: Martins,Alex Tadeu; Santos,Fabiano de Sant´Ana dos; Scannavino,Fábio Luiz Ferreira; Pires,Juliana Rico; Zuza,Elizângela Partata; Junior,João Armando Padovani; Azoubel,Reinaldo; Di Mateo,Miguel Angel Sala; Lopes,Ruberval Armando.
The cyclamate, a sweetner substance derived from N-cyclo-hexyl-sulfamic acid, is largely utilized as a non-caloric artificial edulcorant in foods and beverages as well as in the pharmaceutical industry. The objective of this study was to evaluate karyometric and stereological alterations in the rat fetal pancreas resulting from the intraperitoneal administration of sodium cyclamate. The exocrine pancreas of ten fetuses of rats were evaluated, five treated and five controls chosen at random, in which five rats that received from the 10th to 14th days of pregnancy an intraperitoneal daily injection of sodium cyclamate at 60 mg/Kg of body weight during 5 days. At the 20th day of gestation, the animals were removed and weighed, as were their placentas; the...
Tipo: Journal article
Palavras-chave: Sodium cyclamate; Exocrine pancreas; Karyometry; Stereology.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300038

MORPHOMETRICAL AND STEREOLOGICAL ANALYSIS OF THE SUPERIOR CERVICAL GANGLION OF Rattus norvegicus SUBMITTED TO CHRONIC TREATMENT WITH CORTISOL
Provedor de dados: 77
Autores: Cortez,C. M.; Costa,W. S.; Babinski,M. A.; Chagas,M. A.
The present work investigates the corticoid action on the growth of the superior cervical ganglion of the rat and describes the cortisol effect during early stages of development. The study was based on morphometric and stereological analysis of the perikarya. Eight rats were treated intraperitoneally with cortisol (1mg/Kg/day) during 36 days. Treatment was initiated in the 8th day after birth and was withdrawn one day before the sacrifice. There was a significant difference (&lt;=P0,05) for the neural mean diameter between the control group (16.78 ± 1.11mm) and treated animals (15.84 ±0.99mm). The decrease of perikarya neuronal diameter was also demonstrated by stereological methods. Morphometrical findings may suggest alterations in superior cervical...
Tipo: Journal article
Palavras-chave: Morphometry; Stereology; Glucocorticoid; Sympathetic ganglion; Rat.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000300006

Niveles de Origen de las Arterias Renales y Mesentérica Superior Respecto a la Columna Vertebral en Individuos Chilenos: Estudio por Tomografía Computarizada Helicoidal
Provedor de dados: 77
Autores: Olave,E; Puelma,F; Henríquez,J; Cruzat,C; Soto,A.
El conocimiento de las variaciones arteriales es importante tanto para el diagnóstico como para los procedimientos quirúrgicos a realizar en el abdomen. Esta investigación se realizó con el propósito de determinar a través de angio TAC, los niveles de origen y número de las arterias renales y mesentérica superior, con respecto a los componentes de la columna vertebral. Para ello, utilizamos los registros angiográficos de 31 pacientes, adultos, chilenos, de ambos sexos, en los cuales localizamos los puntos de origen de las arterias mencionadas, para lo cual dividimos la altura de las vértebras en tercios, considerando además al disco intervertebral. En 26 pacientes, la arteria renal en ambos lados se presentó única; en el lado derecho, la arteria renal se...
Tipo: Journal article
Palavras-chave: Anatomía; Aorta abdominal; Arterias renales; Arteria mesentérica superior.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200022

Unilateral Pectoralis Minimus Muscle: A Case Report
Provedor de dados: 77
Autores: Rai,Rajalakshmi; Ranade,Anu V; Prabhu,Latha V; Prakash,; Rajanigandha,V; Nayak,Soubhagya R.
Presence of additional muscles in the pectoral region has often been reported. We report about the presence of Pectoralis Minimus muscle, in a male cadaver. It was present deep to the pectoralis major muscle and superomedial to the pectoralis minor muscle. The variant was closely related to the branches of thoracoacromial vessels where one of the branches was passing between the pectoralis minor muscle and the variant muscle. Hyperabduction of the arm may compress these vessels giving rise to certain vascular symptoms. Also these variations should be borne in mind during certain surgical procedures in the pectoral region.
Tipo: Journal article
Palavras-chave: Muscle variation; Anatomy; Pectoral muscles.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100004

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

The Effects of Polymeric Zinc Propylen-Bis-Dithiocarbamate (Propineb) on Tooth Development in Rats
Provedor de dados: 77
Autores: Mahmut,Koparal; Faruk,Er; Engin,Deveci; Dilek,Yavuz.
Dithiocarbamate propinebs are organometal fungicides that are widely used for the control of diseases in plants. In this study, pregnant female rats received 400 ppm propineb concentrations in 5 ml distilled water for 16 days of gestation, and then infant rats were obtained by cesarean section. In the histological analysis on the frontal sections, the use of propineb was found effective on odontoblast cell hyperplasia, cell infiltration in the dental papilla, and degeneration in the mesenchymal cells of the outer enamel. The expression of MMP-2 (Matrix Metalloproteinase-2) and VEGF (Endothelial cell growth factor) in the connective tissue was evaluated by immunohistochemistry. The drinking water given to the mothers in propineb tooth bud, enamel and...
Tipo: Journal article
Palavras-chave: Propineb; MMP2; Tooth buds; VEGF.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100014

Tribulus terrestris Hydroalcoholic Extract Administration Effects on Reproductive Parameters and Serum Level of Glucose in Diabetic Male Rats
Provedor de dados: 77
Autores: Ghanbari,Ali; Moradi,Mojtaba; Raoofi,Amir; Falahi,Mahsa; Seydi,Sepideh.
Usage of medicinal plants for the treatment of diseases is a remarkable strategy considered in both clinical and experimental studies. This study was conducted to evaluate the effect of Tribulus terrestris hydroalcoholic extract administration on the serum level of glucose and reproductive parameters in diabetic male rats. In this experimental study, 30 adult male Wistar rats (200­250 g) were divided into 5 groups (n= 6). Diabetes was induced by a single intraperitoneal injection of 50 mg/kg streptozotocin. Experimental groups received daily Intraperitoneal injection of the extract (100, 250 and 500 mg/kg) since one week after inducing diabetes for two weeks. At the end of the experiment, the serum levels of testosterone and glucose were examined by ELISA...
Tipo: Journal article
Palavras-chave: Diabetes; Glucose; Rat; Streptozotocin; Testosterone; Tribulus terrestris.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200058

Persistencia de Epónimos en Terminologia Histologica
Provedor de dados: 77
Autores: Roa,Ignacio; Vásquez,Bélgica; Contreras,Manuel.
El uso de epónimos aún es una práctica frecuentemente utilizada entre médicos clínicos y académicos para referirse a las distintas estructuras en histología. A pesar de los esfuerzos por parte de la comunidad morfológica por desarraigarlos del lenguaje médico, hoy en día se encuentran, inclusive presentes en Terminologia Histologica, tal como en los casos de Schannocytus (H2.00.06.2.02003) referente a la Célula de Schwann; Complexus golgiensis (H1.00.01.3.0146) referente al Aparato de Golgi, Cellula panethensis (H3.04.03.0.00017) referente a la Célula de Paneth, y Neuron purkinjense (H3.11.03.4.01015) referente a la Neurona de Purkinje, que aluden a los investigadores Theodor Schwann, Camillo Golgi, Joseph Paneth y Jan Evangelista Purkinje,...
Tipo: Journal article
Palavras-chave: Schannocytus; Célula de Schwann; Complexus golgiensis; Aparato de Golgi; Cellula panethensis; Célula de Paneth; Neuron purkinjense; Neurona de Purkinje; Terminologia Histologica; Epónimos.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400012

Investigation of the relationship between "Sella Turcica Bridge" and "Ponticulus Posticus": A Lateral Cephalometric Study
Provedor de dados: 77
Autores: Tassoker,Melek; Kok,Hatice; Ozcan,Sevgi.
The ponticulus posticus (PP) is a bridge of bone sometimes found on the atlas vertebra surrounding the vertebral artery and the first cervical nerve root. Sella turcica bridging (STB) is the fusion of anterior and posterior clinoid processes. The objective of this study was to find out the association between STB and PP. For the study, 752 digital lateral cephalograms were retrieved from the archived records of Necmettin Erbakan University, Faculty of Dentistry, Konya, Turkey. There was a significant relationship between the presence of STB and PP (p=0.000, p&lt;0.001). This study indicates that there is a significant correlation between the presence of STB and PP.
Tipo: Journal article
Palavras-chave: Sella turcica; Lateral cephalometrics; Sella turcica bridging; Ponticulus posticus.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100053

Morphology of the Physiological Apical Foramen in Maxillary and Mandibular First Molars
Provedor de dados: 77
Autores: Abarca,J; Zaror,C; Monardes,H; Hermosilla,V; Muñoz,C; Cantin,M.
Information regarding the anatomy of the physiological apical foramen is limited. Knowing its diameter and shapes contributes to clinical work, specifically to the cleaning and shaping of the apical third. The aim of this ex vivo study was to determine the minimum and maximum diameters and shape of the physiological apical foramen in the roots of maxillary and mandibular first molars. A descriptive study was conducted on 89 recently extracted first molars. Roots 3-5 mm from the apex were sectioned and prepared for analysis at 40x magnification. The minimum and maximum diameters of each physiological foramen were measured using the program Motic Images plus 2.0 ML. The shape of the foramina, classified as round, oval or irregular, was determined by the...
Tipo: Journal article
Palavras-chave: Physiological Foramen; Apical constriction; Root apex; Apical diameter; Foraminal morphology; Permanent first molar.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200048

Sexual Dimorphism in the Foramen Magnum Dimensions
Provedor de dados: 77
Autores: Suazo Galdames,Iván Claudio; Perez Russo,Priscilla; Zavando Matamala,Daniela Alejandra; Smith,Ricardo Luiz.
The purpose of this study is to assess the presence of sexual dimorphism in the foramen magnum size. We analyzed 211 human skulls from the collection of the Universidade Federal de Sao Paulo, with a record of sex and age determined using anteroposterior and transverse diameters of foramen magnum, and their differences by gender (p&lt;0.05) were ascertained. Fischer linear discriminant function was calculated and the value for the classification of these variables was determined. All the dimensions were found to be higher, and in men's skulls, the foramen magnum size had low discriminating power and were accurately classified only in 66.5% skulls. Our results show that this quantitative indicator is of limited practical value and should be supplemented with...
Tipo: Journal article
Palavras-chave: Foramen magnum; Determination of sex; Sexual Dimorphism; Anthropometries; Fischer discriminant function.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100003

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

Rotator cuff Disease: Aspects and Implications
Provedor de dados: 77
Autores: Schadeck de Almeida,Josiane; Carvalho Filho,Guaracy; Marino Lamari,Neuseli.
The objetive this study was analyze the characteristics of the rotator cuff disease carrying and its implications by the lesion evolutional stage. 112 patients with initial diagnosis of rotator cuff disease were interviewed, most of them women, average age of 51 years, right side more injured, with evidence to be the most damaged (p=0,00) and with a lot incapacity to move the upper limbs (p&lt;0,05). The most found pathology stage was the partial rupture of supraspinatus tendon, 26,16 months of attendance and without association with pathology stages. Most of patients were treated with physiotherapy and just 19% of them were submitted to the surgery procedure. It has shown that this pathology implies in lots functional damages, affects social and work...
Tipo: Journal article
Palavras-chave: Shoulder impingement syndrome; Physical therapy; Rotator cuff.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000400016

Hermaphroditism in Marine Mussel Perumytilus purpuratus (Lamarck, 1819), (Mollusca: Mytilidae)
Provedor de dados: 77
Autores: Montenegro Villalobos,Diana; Olivares Paz,Alberto; González,María Teresa.
Marine bivalves are essentially gonochoric species. However, some occasional hermaphrodites specimens can be found. A histological description of two (among 179) hermaphrodites of the marine mussel Perumytilus purpuratus (Lamarck, 1819) that were collected in San Jorge Bay (24S) is given. The low proportion of hermaphrodites suggests that P. purpuratus hermaphroditism could be an accidental phenomenon; nevertheless other causes are also discussed in the present study.
Tipo: Journal article
Palavras-chave: Bivalve; Hermaphroditism; Perumytilus purpuratus.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200038

Effect of Ethanol Extract of Whole Plant of Trichosanthes cucumerina var. cucumerina L. on Gonadotropins, Ovarian Follicular Kinetics and Estrous Cycle for Screening of Antifertility Activity in Albino Rats
Provedor de dados: 77
Autores: Kage,Devendra N; Malashetty,Vijaykumar B; Seetharam,Y. N; Suresh,P; Patil,Saraswati B.
Ethanol extract of whole plant of Trichosanthes cucumerina L. var. cucumerina was evaluated for antiovulatory activity in adult rats. The ethanol extract at the doses 200 and 400mg/kg body weight (orally) affected the normal estrous cycle showing a significant increase in estrus and metestrus phases and decrease in diestras and proestrus phases. The extract also significantly reduced the number of healthy follicles (Class I-Class VI) and corpora lutea and increased the number of regressing follicles (Stage IA, Stage IB, Stage IIA, and Stage IIB). The protein and glycogen content in the ovaries were significantly reduced in treated rats. The cholesterol level was significantly increased, whereas, the enzyme activities like 3b-HSD and 17b-HSD were...
Tipo: Journal article
Palavras-chave: Trichosanthes cucumerina L. var. cucumerina; Antifertility; Folliculogenesis; Estrous cycle; Gonadotropins; 3 b-HSD; 17 b-HSD activity; Ovarian steroidogenesis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100030

Palatal Rugae for the Construction of Forensic Identification
Provedor de dados: 77
Autores: Bing,Li; Wu,Xiu-Ping; Feng,Yin; Wang,Yu-Jin; Liu,Hong-Chen.
This study aims to explore the role of palatal rugae pattern in forensic identification by coding of palatal rugae characteristics, and to construct a forensic identification system for oral palatal rugae. One hundred models were included in this study for a systemic coding of palatal rugae pattern based on the shape, quantity, location, and distribution of palatal rugae. Among the involved 100 models, palatal rugae types varied among individuals and palatal rugae pattern was different between men and women, even between two sides in the same individual. Palatal rugae pattern can be used for forensic identification of oral soft tissue and this study proposes a new means for the identification by coding of palatal rugae pattern based on the shape, quantity,...
Tipo: Journal article
Palavras-chave: Palatal rugae; Identification; Coding.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200028

Estimación y Comparación de la Masa Muscular por Segmento, en Deportistas Juveniles Chilenos
Provedor de dados: 77
Autores: Rodríguez Rodríguez,Fernando Javier; González Fuenzalida,Héctor Ismael; Cordero Ortiz,José Luis; Lagos Nieto,Sebastián; Aguilera Tapia,Rodrigo Antonio; Barraza Gómez,Fernando Omar.
El objetivo de este trabajo fue determinar y comparar la composición corporal de deportistas chilenos juveniles destacados, pertenecientes a las selecciones nacionales en el año 2011, de diferentes disciplinas deportivas mediante métodos antropométricos. Fueron evaluados 4 grupos de deportistas juveniles de alto rendimiento, con un número total de 92 individuos, pertenecientes a las disciplinas de lucha olímpica, halterofilia, básquetbol y fútbol. La Masa Muscular de los miembros superiores (MMES) es mayor en basquetbolistas y Halterofilistas con 7,49 (±1,25) y 7,50 (±2,54) kg respectivamente, al ser comparado con futbolistas, quienes obtuvieron un promedio de 5,27 (±0,37) kg. Por otra parte la lucha olímpica posee un promedio de masa muscular de 6,46...
Tipo: Journal article
Palavras-chave: Composición corporal; Masa muscular total; Masa muscular por segmentos.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200053

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

Evaluation of Lingual Frenulum Using Geometric Morphometrics
Provedor de dados: 77
Autores: Kacar,Dundar; Cakmak,Fethiye; Dogan,Ash; Sevinc,Ozdemir; Barut,Cagatay.
A fold of tissue, the lingual frenulum, extends onto the inferior surface of the tongue from near the base of the tongue on midline. The shape, length and alignment of lingual frenulum vary between individuals. The aim of this study is to evaluate morphology of lingual frenulum with respect to gender. Ninety seven volunteers who were students and employees of Zonguldak Karaelmas University, School of Medicine participated in the study. Two individuals with a history of hepatitis and 20 individuals with inadequate photographs were excluded from the study. Morphometric analyses were performed on the photographs of 75 volunteers (36 men, 39 women). Lingual frenulum photograph of each individual was taken using standard photographic techniques. The individual...
Tipo: Journal article
Palavras-chave: Lingual frenulum; Geometric morphometrics; Men; Women; Reference points.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200001

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

Stem Cells and Androgen Receptor in Human Periapical Periodontitis
Provedor de dados: 77
Autores: Rodríguez,H; Espinoza-Navarro,O; Peñafiel,C; Escobar,E; Silva,I; Quiroz,P; Arriaza,C; Castro,M. E; Sánchez,C; Arias,M; Michea,A.
Activation of macrophages in periapical granulomas occurs through the presence of cytokines, endotoxin and other genetic and epigenetic factors, allowing the initiation of inflammation and bone resorption. The present study aims to analyze the presence of CD133 protein (marker of stem cells) and the AR (androgen receptor) protein in biopsies of human odontogenic periapical granuloma. Biopsies from 14 adult male patients with diagnosis of periapical granuloma included in paraffin blocks were processed histologically to obtain 5-µm thick sections. Protein presence was detected and analyzed by immunohistochemistry of CD133 and AR. The quantification considered the number of positive cells in 0.17 mm2 random areas under the microscope using a 1000X objective....
Tipo: Journal article
Palavras-chave: Stem cell; Androgen receptor; Granuloma; Periodontitis.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300048

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

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

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

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

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

Morphometric Study and Anatomical Variations of the Medial Ligament of the Talocrural Joint
Provedor de dados: 77
Autores: Sepúlveda P,Rodrigo; Capurro S,Bruno; Moreno T,René; Giesen F,Laura; Ibarra M,Carla; Silva D,Paula; Telias N,Alberto; Vega P,Eduardo.
The aim of this study was to perform a descriptive study of the morphology, anatomical variations and morphometry of medial talocrural (or deltoid) ligament. We dissected 27 lower limbs obtained from amputations without histories of age, sex or disease. The measurements were made with a caliper, compass and ruler, expressing the results in millimeters. We described the superficial layer morphology of the medial ligament, measuring the size and ligament's thickness. For the deep layer we described and measured the length (l), width (w) and thickness (t). Results: Superficial layer: trapezoid form=66.7% (anterior margin=30.5 mm; posterior margin=27.6 mm; top margin=22.6 mm; bottom margin=50.5 mm), rectangular form=19% (anterior margin=19.3 mm; posterior...
Tipo: Journal article
Palavras-chave: Ligament; Medial; Ankle; Anatomy.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100029

Improving the Reproductive Efficiency of the Goat: Vaginal Cytology and Vulvar Biometry as Predictors of Synchronized Estrus/Breeding Time in West African Dwarf Goat
Provedor de dados: 77
Autores: Leigh,Olufisayo Oluwadamilare; Raheem,Ayobami Kabir; Oluwadamilare Olugbuyiro,Joseph Adebisi.
The characteristics of exfoliated vaginal cells and vulvar biometry following estrus synchronization via two injections of 5mg Lutalyse® administered 7 days apart were investigated with the aim of their possible use to predict estrus in six adult WAD does. Four adult WAD bucks recently passed as satisfactory potential breeders were also involved in the study. The animals were maintained on 12% crude protein concentrate, greens and fresh water ad libitum. All measurements in the does were taken at an interval of 24 hours for six days beginning with the day of 2nd Lutalyse® injection. The does were introduced to the bucks 48 hours after the 2nd dose of Lutalyse® and separated from them after the 6th day. The 72-96 and 96-120 hours vaginal smears of 5 does...
Tipo: Journal article
Palavras-chave: Vaginal cytology; Vulva biometry; Synchronization; Lutalyse®; Predict; Estrus; Doe.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300042

Effects of Passive Smoking Associated with Physical Exercise in the Skeletal Muscles of Rats During Pregnancy and Lactation
Provedor de dados: 77
Autores: Valsoni,Bruna Corral Garcia; Bonfim,Mariana Rotta; Camargo,Regina Celi Trindade; Abreu,Luiz Carlos de; Souza,Dorotéia Rossi Silva; Camargo Filho,José Carlos Silva.
The objective of this study was to analyze the effects of passive smoking, in soleus and gastrocnemius muscles associated with physical exercise by swimming during pregnancy and lactation of rats. Twenty-four rats were divided: GF (exposed to cigarette smoke), GC (control), GFN (underwent to the swimming program and exposed to cigarette smoke) and GN (underwent to the swimming program). On the first day of pregnancy procedure of exposure to cigarette smoke began, consisting in 30 minutes twice a day for six weeks. During the same period the swimming program began, which lasted 60 min every day untilthe 21st day of lactation. Soleus and gastrocnemius muscles, were obtained for histological, histochemical, morphometric analysis and fiber profiling. In...
Tipo: Journal article
Palavras-chave: Passive Smoking; Physical Exercise; Pregnancy; Lactation; Skeletal Muscle.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200015

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

Prevalencia de Patrones Antropométricos y Fisiológicos en Población de Adultos Mayores, sobre los 60 Años en Arica,Chile
Provedor de dados: 77
Autores: Diaz,J; Espinoza-Navarro,O; Rodríguez,H; Moreno,A.
El envejecimiento humano es un proceso complejo y multifactorial que involucra aspectos cognitivos, sociales y físicos. El objetivo de este estudio fue determinar valores de algunos patrones antropométricos y fisiológicos y comparar el efecto de la actividad física, de estos patrones en población adulta mayor. Cien adultos mayores en edades a partir de los 60 años participaron de este estudio. En esta población se procedió a medir peso, talla y calcular el índice de masa corporal (IMC), además se obtuvieron registros de la capacidad vital y el consumo máximo de oxígeno. Luego a través de muestra sanguínea se determinó hematocrito y hemoglobina. La población se categorizó en rangos de edades y se separó según género. Posteriormente por encuesta simple de...
Tipo: Journal article
Palavras-chave: Envejecimiento; Salud pública; Antropometría; Hemoglobina.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400064

Scope of Anatomy Teaching in Problem-based Learning (PBL) Sessions of Integrated Medical Curriculum
Provedor de dados: 77
Autores: Potu,Bhagath Kumar; Shwe,Wuna Hla; Jagadeesan,Saravanan; Aung,Thidar; Cheng,Peh Suat.
Problem based learning (PBL) made a great impact on the methodology of teaching. The major advantage of PBL method of teaching is integration of basic and clinical sciences in an integrated curriculum. This is achieved by presenting clinical problems to students which contain learning objectives from subjects related to the given clinical problems. In recent reports deficiencies have been reported regarding quantity of anatomy content of the clinical problems which has resulted in difficulty in understanding of theanatomy. We have made an attempt to quantify the content of anatomy and its sub-disciplines in PBL curriculum by a case study method using 'documentary analysis' at School of Medicine and Health Sciences, UCSI University, Kuala Lumpur, Malaysia....
Tipo: Journal article
Palavras-chave: Anatomy; Teaching; Problem ­based learning.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300019

Morphometry of Isan-Thai Clavicles as a Guide for Sex Determination
Provedor de dados: 77
Autores: Kaewma,Ailadda; Sampannang,Apichakan; Tuamsuk,Panya; Iamsaard,Sitthichai.
The dried clavicles have been well documented to determine individual sex and age in many races. Such morphometric investigations in Isan (Northeastern) Thais have never been reported. Therefore, this study aimed to estimate the sex from dried clavicles of Isan-Thais using morphometric analysis. The identified 454 dried clavicles (254 males and 200 females), averaged age (60.69±14.36 years) were measured and analyzed for identification point (IP) and the demarking point (DP) values. The results showed that the identified-bone percentages by IP of the maximum clavicular lengths in males and females were 90.55 % (&amp;gt;139.9 mm) and 89 % (&lt;140.6 mm). In addition, such percentages of the mid shaft circumference measured in male clavicles was 83.46 %...
Tipo: Journal article
Palavras-chave: Clavicle; Morphometry; Isan Thais; Sex determination.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100028

Hermafroditismo Funcional de la Gónada de Fissurella crassa (Mollusca: Fissurellidae)
Provedor de dados: 77
Autores: Olivares Paz,Alberto; Jofré Madariaga,David; Alvarez Mazú,Carlos; Bustos-Obregón,Eduardo.
La costa del Pacífico sudoriental es el hábitat de las 13 especies de lapas descritas del subgénero Fissurella Brugière. En estas especies no existe dimorfismo sexual, los animales son dioicos, el sexo se reconoce explorando directa o indirectamente las gónadas y no tienen procesos de reversión sexual. La presencia de un organismo de Fissurella crassa con gónada formada por porciones de ovario y otras de testículo con capacidad para generar óvulos y espermatozoides, evidencia la potencialidad que los organismos de Fissurella poseen para desarrollar el hermafroditismo funcional. Sin embargo, el presente hallazgo no permite inferir si el agente desencadenante del desarrollo sincrónico funcional de la gónada hermafrodita es un factor endógeno y/o asociado a...
Tipo: Journal article
Palavras-chave: Mollusca; Fissurella crassa; Hermafrodita; Gónada; Gametos.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200034

Histomorphometric Evaluation of Soleus and Lateral Gastrocnemius Muscles of Animals Submitted to Pharmacological Manipulation with Fluoxetine
Provedor de dados: 77
Autores: Caiaffo,Vitor; Ribeiro,Alice Sá Carneiro; de Oliveira,Belisa Duarte Ribeiro; de Albuquerque,Yuri Mateus Lima; de Moraes,Silvia Regina Arruda.
The pharmacological manipulation with selective inhibitor of serotonin reuptake (SSRIs) can modify the operation of the serotonergic system and may facilitate or inhibit the action of this system, inducing changes in the morphology of the skeletal muscle of rats. The objective of this study was to evaluate the action of the treatment with fluoxetine during the critical period of the animal´s life on development of the soleus and lateral gastrocnemius muscles, under the aspects of weight, the number of nuclei of myocyte cells and cross-sectional area of muscle fibers. Twenty four (30 and 90-day-old) male Wistar rats were used. They were treated with saline solution (NaCl 0.9%; 1 ml/100 g of body weight) or fluoxetine (10 mg; 1 ml/100g of body weight). The...
Tipo: Journal article
Palavras-chave: Fluoxetine; Muscles Fiber; Skeletal Muscle; Myonuclei; Cross Section Area.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300001

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

El Significado de la Práctica de Disección para los Estudiantes de Medicina
Provedor de dados: 77
Autores: Montemayor Flores,Beatriz Georgina.
El origen de la práctica de disección se remonta siglos atrás, en el tiempo del Museo de Alejandría (III a.C.). Durante casi 23 siglos esta práctica se ha transformado, desde un ejercicio racional hasta la simulación en la "realidad virtual" pasando por la prohibición y el dictado fiel a los cánones impuestos por los anatomistas galénicos. ¿Qué opinan sobre la disección los alumnos de medicina del siglo XXI quienes durante el primer año de su formación habrán que enfrentarse de manera cotidiana a esta actividad? Eso le preguntamos a los alumnos de primer año de la Facultad de Medicina de la Universidad Nacional Autónoma de México. Los resultados de este trabajo nos hablan de la vigencia de esta antigua y moderna estrategia que permite acercarse a la...
Tipo: Journal article
Palavras-chave: Anatomía humana; Disección; Educación médica; Enseñanza de la anatomía.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500010

One Case of Triphallia in the Marine Snail Echinolittorina peruviana (Caenogastropoda: Littorinidae)
Provedor de dados: 77
Autores: Castillo,Viviana M; Brown,Donald I.
Gonochoric representatives of Littorinidae have a reproductive system organized with transit organs that connects the testicle with a penis specialized for internal fertilization. However, malformations at this level can produce, like triphallia (presence of triple penis). This description corresponds to one case of triphallia found in Echinolittorina peruviana (Lamarck, 1822) inhabitant of the South Pacific coasts. The macro and microscopic analysis reveals that every penis is an independent appendix whose individual morphology is similar to that in normal individuals, characterized by a non pigmented conic penis associated with a mammilliform gland located at the base of the right ocular tentacle. The cervical sperm groove lined by a simple ciliated and...
Tipo: Journal article
Palavras-chave: Mollusk; Reproduction; Reproductive system; Penial morphology; Malformation; Littorinidae.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300003

Effects of Melatonin on Tibia Bone Defects in Rats
Provedor de dados: 77
Autores: Koparal,M; Irtegün,S; Alan,H; Deveci,E; Gülsün,B; Pektanç,G.
The aim of this study was to evaluate the effects of melatonin healing in a tibial bone defect model in rats by means of histopathological and immunohistochemistry analysis. Twenty one male Wistar albino rats were used in this study. In each animal, bone defects (6 mm length ) were created in the tibias. The animals were divided into three groups. In group 1 control group (rats which tibial defects). Group 2 melatonin (10 mg/kg) + 14 days in the tibial defect group) was administered intraperitoneally to rats. Group 3 melatonin (10 mg/kg) + 28 days in the tibial defect group) was administered intraperitoneally to rats. Histopathological analysis of samples was performed to evaluate the process of osteoblastic activity, matrix formation, trabecular bone...
Tipo: Journal article
Palavras-chave: Tibial defects; Melatonin; Osteonectin; Osteopontin.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200053

MORPHOMETRIC ANALYSIS OF THE DEVELOPMENT OF THE OVARIAN FOLLICLES IN PINEALECTOMIZED RATS
Provedor de dados: 77
Autores: Pereira dos Santos,Katharine Raquel; Coelho Teixeira,Álvaro Aguiar; da Silva Neto,Eulâmpio José; Teixeira,Valéria Wanderley; da Cunha,Franklin Magliano.
The present study had the objective of analyzing morphometrically the occupied area by the ovarian follicles in ovaries of pinealectomized female rats. To do so, 24 albino female rats (Rattus norvegicus albinus) were used, which were equally divided in the following groups: Group I ­ sham-pinealectomized rats and kept in the light/dark cycle (12/12 hours), for three months; Group II ­ pinealectomized rats and kept in the light/dark cycle (12/12 hours), for three months; Group III ­ pinealectomized rats and kept in the absence of light for three months; Group IV ­ sham-pinealectomized rats and kept in the absence of rats for three months. The results showed that the groups I and IV presented, respectively, average of 19,00 and 25,00, while groups II and III...
Tipo: Journal article
Palavras-chave: Pinealectomy; Ovaries; Morphometric; Estrus.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000200001

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

Ejaculate Characteristics of Rabbits Infected with Trypanosoma congolense and Changes Caused after Treatment with Diminazene aceturate (Diminaveto®)
Provedor de dados: 77
Autores: Leigh,Olufisayo Oluwadamilare; Fayemi,Oluremi Eric.
The effects of experimental Trypanosoma congolense infection on the ejaculate of rabbits and changes caused after treatment with Diminaveto® were investigated using 24 New Zealand White rabbits (bucks). The bucks were housed singly in standard rabbit cages and fed on specialized ration containing 10% Protein supplement, grains, legume, salt and fresh water ad libitum during the study. Data on ejaculate characteristics were collected from all the bucks in the first phase (i.e. before infection) and in the second phase (i.e. during infection, with 4.8x10(5) Trypanosoma congolense, intraperitoneally). Similar data were collected from 12 randomly selected bucks treated with 7.0mg/kg Diminaveto® following reconstitution during the third phase. Data collected...
Tipo: Journal article
Palavras-chave: Ejaculate; Bucks; Trypanosoma congolense; Treatment; Diminazene.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200022

Topography of the Middle Genicular Artery is Associated with the Superior and Inferior Genicular Arteries
Provedor de dados: 77
Autores: Yang,Kiwook; Park,Jae-Hee; Jung,Soo-Jung; Lee,Hyunsu; Choi,In-Jang; Lee,Jae-Ho.
Total knee arthroplasty has increased substantially, however anatomical studies of the genicular arteries (GAs) in this region are rare. The aim of this study was to identify the pattern and branching points of GAs and their relationship. In 42 lower limbs, the pattern and branching points of GAs were confirmed. The horizontal line which extends between the most prominent point of the lateral and medial margins of patella was defined as a reference line. The distance of branching point of the GAs from the reference line was measured, and the correlations between these points were analyzed. The superior lateral and medial genicular arteries (SLGA and SMGA) were located at + 38.17 ± 3.10 mm and + 32.68 ± 3.83 mm from the reference line, respectively. The...
Tipo: Journal article
Palavras-chave: Genicular artery; Popliteal artery; Topography; Variations.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300019

Inca Bone in Human Skulls of the West Anatolian Population
Provedor de dados: 77
Autores: Cirpan,Sibel; Aksu,Funda; Mas,Nuket.
The Inca bones are rarely seen among other inter sutural bones and are accepted as variants of the normal. The incidence of the Inca bones has been researched in different populations. The aim of this study was to investigate the rate and types of the Inca bones in West Anatolian population. One hundred fifty-one skulls of West Anatolian subjects of unknown ages and sex were examined. None of the specimens showed signs of prior cranial surgery, bony malformation or trauma. The skulls were classified as adults with teeth eruption. The Inca bones were macroscopically determined and analysed. The samples were photoghraphed with Canon 400B (55 mm objective). We follow previous criteria and nomenclatures of the Inca bones. The incidence of Inca bones of...
Tipo: Journal article
Palavras-chave: Neurocranium; Sutural bones; Inca bones; West Anatolia.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100045

Somatotype Profile and Body Composition of Players from the Mexican Professional Basketball League
Provedor de dados: 77
Autores: Ochoa Martínez,Paulina Yesica; Hall López,Javier Arturo; Alarcón Meza,Edgar Ismael; Arráyales Millán,Emilio Manuel; Sánchez León,Ricardo.
The purpose of this research was to determine the somatotype profile and body composition of team members of Soles de Mexicali from the Mexican professional basketball league season 2012. A descriptive cross-sectional study in which 10 members of that team are evaluated to determine the somatotype and body composition, they were assessed with anthropometric variables in accordance with ISAK (International Society for the Advancement of Kinanthropometry was performed) the equipment used was the Tom Kit Rosscraft Inc. The somatotype and body composition were determined through measurements of body weight (cm), height (cm), eight skinfolds (mm) triceps, sub scapular, biceps, iliac crest, supra spinal, abdominal, front thigh, medial calf, eleven circumferences...
Tipo: Journal article
Palavras-chave: Basketball; Somatotype; Body Composition.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300046

Lateral Asymmetry in Upper and Lower Limb Bioelectrical Impedance Analysis in Youth Tennis Players
Provedor de dados: 77
Autores: Filipcic,Ales; Cuk,Ivan; Filipcic,Tjasa.
Tennis is a sport that requires asymmetric movements of dominat limbs and may lead to an asymmetric distribution of muscle mass. The main aim of the presented study was to determine the volume and degree of lateral asymmetry of the upper and lower limbs in youth tennis players using a bioelectrical impedance analysis. T-test was applied to find differences between the dominant and non-dominant arm and the right and left leg and thigh in four age categories. There were no significant differences between the right and left leg lean mass in the 12 and under, 14 and under and 16 and under age groups, but there were significant differences between the dominant and non-dominant arm lean mass and arm circumferences in all four age groups. All young tennis players...
Tipo: Journal article
Palavras-chave: Young tennis players; Asymmetry; Bioelectrical impedance analysis.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300012

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

Muscle Fibre Types and Connective Tissue Morphometry in Frontal Muscle of Norfolk Rabbits (Oryctolagus cuniculus)
Provedor de dados: 77
Autores: Hebling,André; Scabora,José Eduardo; Esquisatto,Marcelo Augusto Marretto.
The frontal muscle is formed by a complex of contractile elements which compose the set of facial muscles responsible for the expression of emotions. In view of its functional characteristics the frontal muscle consists of a mixture of high (type I) and low oxidative (type II) muscle fibres. The objective of the present study was to determine the area, diameter, and relative volume occupied by each fibre type in frontal muscles of Norfolk rabbits using nicotinamide adenine dinucleotide tetrazolium reductase (NADH-TR) histochemistry combined with morphometry. In addition, the connective tissue area (endomysium) and the number of blood vessels per fibre were evaluated. Female rabbits ranging in age from 6 to 8 months and weighing 2.8 to 3.1 kg were used....
Tipo: Journal article
Palavras-chave: Morphometry; Frontal muscle; Fibre type; Connective tissue.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100032

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

Stretch Injuries of Skeletal Muscles: Experimental Study in Rats' Soleus Muscle
Provedor de dados: 77
Autores: Pachioni,Célia Aparecida Stellutti; Mazzer,Nilton; Barbieri,Claudio Henrique; de Camargo,Marcela Regina; Fregonesi,Cristina Elena Prado Teles; do Carmo,Edna Maria; Nozabielli,Andrea Jeanne Lourenço; Martinelli,Alessandra Rezende.
The study aimed to verify the physiological injury behavior by stretching the soleus muscle of rats, using a noninvasive experimental model. Twenty-four rats were used and divided into three groups of eight animals: control group (A), group that performed tetanus followed by electrical stimulation and a sudden dorsiflexion of the left paw performed by a device equipped with a mechanism of muscle soleus rapid stretching (B); and a group that only received the tetanus (C). Three days later, the animals were killed, and the soleus muscle was resected and divided into three segments. Morphological changes indicative of muscle damage appeared in all three segments of group B. In a lesser degree, similar changes were also detected in muscles subjected to only...
Tipo: Journal article
Palavras-chave: Disease models; Animal; Rats; Skeletal muscle; Tetany.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400029

Morphological and Radiographic Studies on the Skull of Indian Blackbuck (Antilope cervicapra)
Provedor de dados: 77
Autores: Choudhary,Om Prakash; Singh,Ishwer.
The phenotypic appearance of the head of animal species depends strongly on the shape of the skull. The present study has been carried out on morphological and radiographic characteristics of skull of the Indian Blackbuck. The skull comprised of cranial and facial bones. The cranial bones included occipital, sphenoid, ethmoid, interparietal, parietal, frontal and temporal. The occipital was a single bone surrounding the foramen magnum. The sphenoid was a single bone and situated between the occipital posteriorly and the ethmoid anteriorly. The ethmoid was a single bone laid ventral to the frontal and nasal bones. The interparietal was a small quadrilateral bone wedged in between the parietal anterio-laterally and the supraoccipital posteriorly. The...
Tipo: Journal article
Palavras-chave: Blackbuck; Skull; Morphological; Radiographic; Cranial; Facial bones.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200055

Índice Cefálico en un Grupo de Individuos Mapuches de la IX Región de Chile
Provedor de dados: 77
Autores: del Sol,Mariano.
El grupo étnico mapuche tiene una amplia distribución de asentamiento en la IX Región de Chile, estando más aislados de centros urbanos aquellos individuos que viven en algunos sectores del litoral de la Región. Varios factores, entre éstos los aspectos étnicos son considerados determinantes en la forma de la cabeza y en sus índices. Se efectuó un estudio antropométrico en 50 individuos adultos (19-83 años), de sexo masculino, del grupo étnico mapuche, pertenecientes a algunas reducciones de la zona costera de la IX Región de Chile. En ellos se midieron los diámetros cefálicos y curvas craneales y se determinó el índice cefálico. El diámetro occipitofrontal máximo promedio fue de 184 mm (DS 6), con límites superior de 185mm e inferior de 182mm. El diámetro...
Tipo: Journal article
Palavras-chave: Índice cefálico; Grupo étnico Mapuche; Chile; Chile.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000300009

Inervación de la Cabeza Larga del Músculo Tríceps Braquial
Provedor de dados: 77
Autores: Molina,Claudio R; Díaz,Israel; Taunton,María José; Flores,Elías; Rosas,Carlos; Letelier,Rene.
Clásicamente, la inervación del músculo tríceps braquial se atribuye al nervio radial. Sin embargo, reportes clínicos han observado parálisis de la cabeza larga del músculo tríceps braquial posterior a lesiones del nervio axilar, ocurridas luego de una luxación de la articulación glenohumeral, poniendo en duda la inervación de la cabeza larga del músculo tríceps braquial. El objetivo del presente estudio es verificar la inervación de la cabeza larga del músculo tríceps braquial por parte del nervio axilar. Se disecaron 12 regiones posteriores de hombro y brazo, previamente fijadas en solución fijadora conservadora, identificando ramos de inervación del nervio axilar hacia la cabeza larga del músculo tríceps braquial, luego se obtuvieron muestras para...
Tipo: Journal article
Palavras-chave: Nervio axilar; Músculo tríceps braquial; Anatomía; Luxación; Hombro.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200009

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

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

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

Electromyographic Evaluation of Mandibular Biomechanic
Provedor de dados: 77
Autores: Coelho-Ferraz,Maria Julia P; Bérzin,Fausto; Amorim,Cesar; Queluz,Dagmar de Paula.
The study of the craniomandibular biomechanics is related to the system of predominant lever and of the relation between function and mechanically induced deformations. This study has the purpose of evaluating the chewing muscular dynamics in the surface electromyography Seventeen people of both sex, medium aged about 25, were selected, white skin and presenting Class I of Angle without apparent sign and symptom. The electromiographic data were obtained bilaterally from the masseter muscles, anterior temporal portion at the rest position and isometric position. Medtrace® passive bipolar surface electrodes were used coppled to a pre-amplifier, forming a circuit corresponding to a differential circuit. The registrations of the electric signals were caught by...
Tipo: Journal article
Palavras-chave: Mandibular biomechanical; Electromyography.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200029

Portable Document Format File Containing the Surface Models to Learn the Stereoscopic Shape of Foot Muscles
Provedor de dados: 77
Autores: Jang,Hae Gwon; Chung,Min Suk; Shin,Dong Sun.
We intended to present a portable document format (PDF) file containing stereoscopic surface models of the foot. While other surface models are subjectively drawn based on anatomical knowledge, our models are reconstructed from high quality sectioned images. Unlike other models, ours in the complimentary PDF file can also be saved on individual user computers to be manipulated off-line. The skin, 27 bones, 24 muscles, and 19 ligaments in the foot were delineated on a male cadaver's sectioned images from the Visible Korean project. After stacking the outlines of the structures, other than those of the ligaments, surface reconstruction was performed. The resultant surface models were placed in a PDF file, in which the models could be superimposed on either...
Tipo: Journal article
Palavras-chave: Visible Human Projects; Foot; Muscles; Three-dimensional imaging; Computer-assisted image processing; User-computer interface.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400016

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

The Prophylactic Effects of Folic Acid and Vitamin E against Valproic Acid During Fetal Thymus Development: an Ultrastructural Study
Provedor de dados: 77
Autores: Pamukcu Baran,Ozlem; Tunik,Selcuk; Akkoc,Hasan; Devieci,Engin; Ayaz,Ercan; Soker,Sevda; Kalkanli Tas,Sevgi; Akkus,Murat.
To evaluate histopathologic differences in the thymus of Wistar Albino rat fetuses prenatally exposed to valproic acid (VPA), folic acid (FA) and vitamin E (Vit-E). VPA (400 mg/kg), FA (400 mcg/kg) and Vit -E (250 mg/kg) were administered to rats on each of gestation days 8, 9 and 10. The fetuses (n:24) were divided into four groups: control, VPA, VPA+Vit-E and VPA+FA groups. On the 20th day of gestation, all pregnant rats were sacrificed and the fetuses were extracted. Thin sections from thymus of live fetuses were stained with uranyl acetate-lead citrate and were examined under transmission electron microscope. The histopathological findings of control group was normal. In VPA group, it showed extensive degenerative changes by VPA were on all tissue...
Tipo: Journal article
Palavras-chave: Valproic acid; Fetal thymus; Vitamin E; Folic acid.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400003

Effects of Supplemental Boron on Intestinal Proliferation and Apoptosis in African Ostrich Chicks
Provedor de dados: 77
Autores: Sun,PengPeng; Luo,You; Wu,Xin Tong; Ansari,Abdur Rahman; Wang,Jing; Yang,KeLi; Xiao,Ke; Peng,KeMei.
Boron is an essential trace element which plays an important role in process of metabolism and the function of the tissues. However, the effects of boron on the intestinal cells in African ostrich chicks are poorly reported. Therefore, this study was designed to investigate the role of boron on proliferation and apoptosis of the intestinal cells. A total of 36, ten day-old ostrich chicks were randomly divided into six groups and fed on the same basal diet supplemented with 0, 40, 80, 160, 320 and 640 mg/L boric acid in drinking water for 80 days. Proliferatingcell nuclearantigen (PCNA) wasused to test the proliferation indexof intestine in different group byimmunohistochemicalstaining (IHC). Apoptoticcellsofintestinewere detectedbyDutp-biotin nick end...
Tipo: Journal article
Palavras-chave: Apoptosis; Boron; Intestine; Ostrich chicks; Proliferation.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300002

EDITORIAL
Provedor de dados: 77
Tipo: Journal article
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000100001

XLII CONGRESO ARGENTINO DE ANATOMÍA
Provedor de dados: 77
Tipo: Journal article
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000200002

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

Morphometric Analysis Related to the Transcondylar Approach in Dry Skulls and Computed Tomography
Provedor de dados: 77
Autores: Pereira,G. A. M; Lopes,P. T. C; Santos,A. M. P. V; Duarte,R. D; Piva,L; Pozzobon,A.
The transcondylar approach (TA) has been used in surgeries to access lesions in areas close to the foramen magnum (FM) and is performed directly through the occipital condyle (OC) or through the atlanto-occipital joint and adjacent portions of the same. The objective of this study is to examine anatomical variations related to the TA by morphometric parameters of the FM, OC and of the hypoglossal canal (HC) in dry skulls and in computed tomography (CT). In 111 skulls, characteristics of the HC, and measures related to the FM, the HC and to the OC were examined. In CT, the measurements obtained bilaterally in 10 patients who underwent examination of the skull base in 1 mm-thick axial helical cuts were the distances from the outer half of the clivus to the...
Tipo: Journal article
Palavras-chave: Transcondylar Approach; Computed Tomography; Hypoglossal Canal; Foramen Magnum; Occipital Condyle; Dry Skulls.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200006

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

Histological Description of Oogenesis in Chiton virgulatus (Mollusca: Polyplacophora)
Provedor de dados: 77
Autores: Vélez-Arellano,Nurenskaya; Shibayama,Mineko; Ortíz-Ordoñez,Esperanza; Silva-Olivares,Angélica; Arellano-Martínez,Marcial; García-Domínguez,Federico.
This paper describes the oogenesis of Chiton virgulatus, based on histological observations under transmission and scanning electron microscopy. Three oocyte types were identified: i) previtellogenic oocytes with a mean diameter of 50±20.5 µm, surrounded by elongated follicular cells of approximately 5 µm, ii) immature vitellogenic oocytes with a mean diameter of 113±15.3 µm and small cytoplasmic projections denoting the onset of the oocyte hull development; adjacent to each projection are pores approximately 0.7 µm in diameter, and iii) mature vitellogenic oocytes with a mean diameter of 146±24.8 µm; the oocyte cytoplasmic projections grow and its apical zone becomes trident-shaped; follicular cells adopt a bulbous shape due to the growth of the...
Tipo: Journal article
Palavras-chave: Egg hull; Vitellogenesis; Ultrastructure.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200038

Morphometric Evidences for Regional Variation in Potential of Neural Plasticity
Provedor de dados: 77
Autores: Fazeli,Seyyed Amirhossein; Davarian,Ali; Behnampour,Naser; Golalipour,Mohammad Jafar.
The neural plasticity showing the ability of nervous system to change its structure and function is a well-documented fact. However regional variation within a CNS structure to undergo plastic changes has been shown by limited studies. Along medial-lateral sequences of parasagittal sections, the molecular layer thickness of primary fissure borderlands in rat cerebellar left hemisphere was studied to assess the regional difference in plasticibility. Despite the homogeneity of cerebellar histology, this study showed that there is a significant interlobular difference between ML thicknesses of Prf borderlands. In addition, it revealed that the thickness alters in a significant trend within each borderland. The quantitative heterogeneity of cerebellar...
Tipo: Journal article
Palavras-chave: Plasticibility; Molecular layer; Primary fissure; Cerebellum; Rat.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300010

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

Inervación de los Músculos Fibulares Largo y Corto en Individuos Chilenos: Estudio Anatómico y Biométrico
Provedor de dados: 77
Autores: Olave,E; Galaz,C; Retamal,P; Cruzat,C.
La inervación de los músculos del compartimiento lateral de la pierna es conocida desde un punto de vista general y su dependencia del nervio fibular superficial (NFS) es descrita en la mayoría de los textos clásicos. Sin embargo, detalles del número de ramos nerviosos que reciben los músculos y a que nivel se encuentran sus puntos motores es poco conocido, sobretodo en nuestra población. Basado en lo anterior y con el propósito de aportar datos respecto a las variables mencionadas y determinar niveles de origen y localización de los puntos motores de los músculos fibulares largo y corto, se realizó un estudio anatómico y biométrico en 16 piernas formolizadas de individuos adultos, chilenos. Se realizó disección por planos, identificando en la parte...
Tipo: Journal article
Palavras-chave: Anatomía; Inervación; Puntos motores; Músculos fibulares largo y corto.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400049

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

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

THE ARTICULAR MUSCLE OF THE KNEE: MORPHOLOGY AND DISPOSITION
Provedor de dados: 77
Autores: Toscano,Ana Elisa; Arruda de Moraes,Silvia Regina; da Silva Almeida,Katiúcia Samara.
To investigate the morphologic aspects and the relations of the articular muscle of the knee with articular cavity of the knee, as well as the disposal of muscular fibers to the level of femur, besides comparing the muscular mass of the articular of the knee with the rest of the muscular mass of the inferior member, 15 inferior members of adult human corpse of both sex, settled in formol and transversally parted, in middle third of the thigh and in proximal third of the leg, had been analyzed. The study method was of macroscopic dissection. The articular muscle of the knee was present in all the analyzed material and in 93.3% of the cases it had its proximal point of attachment in the distal anterior portion of femur. Amongst analyzed specimens, 40% had...
Tipo: Journal article
Palavras-chave: Knee; Articular muscle of the knee; Suprapatellar bursa; Morphology.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400011

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

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

Multiple Tooth Agenesis in Non-syndromic Patient: A Rare Case Report
Provedor de dados: 77
Autores: Borie,Eduardo; Fuentes,Ramón; Beltrán,Víctor.
Dental agenesis is a term referred to the absence of one or more teeth. However, oligodontia is a severe type of tooth agenesis involving six or more congenitally missing teeth, excluding the third molars. Oligodontia has a low prevalence and is a very rare condition. The aim was to show this case report of a 13-year-old female patient who presented oligodontia with absence of eight permanent teeth and condylar atrophy on left side. The patient had no history of any syndrome or systemic disease according to the anamnesis. Is very important to know oligodontia features to perform a carefully treatment plan.
Tipo: Journal article
Palavras-chave: Dental agenesis; Oligodontia; Radiograph.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200045

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

Effect of Lead Intoxication and D-Penicillamine Treatment on Hematological Indices in Rats
Provedor de dados: 77
Autores: Golalipour,Mohammad Jafar; Roshandel,Danial; Roshandel,Gholamreza; Ghafari,Soraya; Kalavi,Mergen; Kalavi,Khodaberdi.
Lead is one of the most important environmental pollution which is toxic to many organ systems. D-penicillamine (D-P) is a chelator drug which is used for treatment of lead toxicity for several years. This study was conducted in order to evaluate the efficacy of D-P in reducing the effects of lead on hematological indices. This study was done on 36 male adult, 6-8 weeks albino Wistar rats in Gorgan University of Medical Sciences. At first male adult rats were exposed to lead acetate in their drinking water. After 8 weeks, 6 rats were selected and blood samples were prepared to assess the effects of lead toxicity. The remained lead exposed rats were divided into recovery and treatment groups where distilled water and D-P was administered for them,...
Tipo: Journal article
Palavras-chave: Lead toxicity; D-Penicillamine; Recovery; Blood indices; Rat.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400008

Left Ventricle Myocardium Volume Densities in Spontaneously Hypertensive Rats (SHR) Following Combination of Exercise and ACE Inhibitor Treatment: A Stereological Study
Provedor de dados: 77
Autores: Inuwa,I. M.; Hassan,M. O.; Ziada,A. M.
This study was designed to test the possible effects of a combination of physical and pharmacological therapy intervention on myocardial structure of the left ventricle in spontaneously hypertensive rats (SHR). Twelve weeks old spontaneously hypertensive rats (n = 40) were divided into four groups of sedentary, (Sed) as controls, exercise only (Exer), lisinopril only 20mg/kg/day (Lis), and exercise + lisinopril (LisExer). Exercise training was performed on a treadmill (5m/min.) for 60 minutes/day, 5 days/week for 10 weeks. At the end of 10 weeks, all the rats were terminally anaesthetised, the heart was arrested in diastole by intravenous procaine and whole animal perfusion fixation through the abdominal aorta was carried out using Karnovsky's fixative (pH...
Tipo: Journal article
Palavras-chave: Myocardium; Hypertrophy; ACE-inhibitor; Volume fraction; Exercise.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000200010

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

Two Rare Anatomical Variations of External Jugular Vein: an Embryological Overview
Provedor de dados: 77
Autores: Ghosh,Susmita; Mandal,Lopamudra; Roy,Sanchita; Bandyopadhyay,Manimay.
Human anatomy is an ocean of unending variations and its mysteries are being unravelled since ages. Knowledge of variations in the superficial veins of head and neck is essential to carry out successful surgical procedures. During routine dissection of head and neck of two middle aged male cadavers, in the Department of Anatomy, Calcutta National Medical College, Kolkata, India, we came out with some interesting venous architecture. The retromandibular vein on the left side of both the cadavers was found to be undivided and joined with the facial vein in the neck at an acute angle to form a common venous trunk at variable distances from the angle of the mandible. That trunk ultimately drained into the left subclavian vein. This might be the result of...
Tipo: Journal article
Palavras-chave: External jugular vein; Retromandibular vein; Facial vein; Variation; Communication.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300008

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

Staining Procedure of Cartilage and Skeleton in Adult Bats and Rodents
Provedor de dados: 77
Autores: Cortés-Delgado,Natalia; Pérez-Torres,Jairo; Hoyos,Julio Mario.
Transparency technique to demonstrate cartilage and skeleton has been used from years 70. This consists basically of the muscle digestion through an enzyme (trypsine), and the staining of cartilage and skeleton using alcian blue and alizarin red on specimens previously fixed to formalin. This technique can be used to study the state of the cartilage and the bones in different stages of the development and to observe abnormalitys. Also it can be used to demonstrate museum specimen skeleton preserved in liquid. In this article is showed the application of this technique for the first time in rodents and adult bats, besides some annotations to optimize the procedure.
Tipo: Journal article
Palavras-chave: Chiroptera; Rodentia; Cartilage; Bone; Morphology.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400032

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

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

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

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

Somatotipo y Estado Nutricional de 10 a 14 Años de Edad en una Muestra de Mapuches de la IX Región, Temuco-Chile
Provedor de dados: 77
Autores: Martínez,Cristián; Silva,Héctor; Collipal,Erika; Carrasco,Vanessa; Rodríguez,Manuel; Vargas,Rodrigo; Gatica,Patricio; Silva,Tamara.
El grupo étnico mapuche tiene una amplia distribución en la Novena Región, el proceso migratorio propio del desarrollo urbano, han hecho que parte de la etnia mapuche se traslade a la ciudad de Temuco, modificando sus estilos de vida. El estudio del Índice de Masa Corporal (IMC), es el parámetro recomendado por la OMS (Organización Mundial de la Salud), para conocer el estado nutricional de acuerdo a la norma técnica nutricional vigente en Chile. El somatotipo es utilizado para estimar la forma corporal y su composición. Este estudio describe la realidad nutricional y el somatotipo de una muestra de mapuches de los colegios municipalizados de la ciudad de Temuco. Se evaluaron 292 adolescentes mapuches de ambos sexos, 154 hombres (52,7%) y 138 mujeres...
Tipo: Journal article
Palavras-chave: Mapuches; Somatotipo; Índice de masa corporal; Estado Nutricional.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100043

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

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

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

El Pirofosfato de Tiamina Reduce el Daño Celular Inducido por Hipoxia en el Cerebro de Ratas Neonatas
Provedor de dados: 77
Autores: Valenzuela Peraza,Armando; Martínez Ávila,Marco A; Jiménez Bravo-Luna,Miguel Ángel; Granados-Rojas,Leticia; Mendoza-Torreblanca,Julieta G; Barragán Mejía,M. Gerardo.
La encefalopatía por hipoxia es causa de discapacidad y requiere de nuevas estrategias terapéuticas. El pirofosfato de tiamina (PPT) es un cofactor esencial de enzimas fundamentales en el metabolismo de la glucosa, cuya disminución puede conducir a la falla en la síntesis de ATP y a la muerte celular. El objetivo de este estudio fue determinar si la administración de PPT, puede reducir el daño celular en un modelo de hipoxia neonatal en ratas. Animales de 11 días de edad fueron tratados con PPT (130 mg/kg) en dosis única o solución salina, una hora antes del protocolo de hipoxia o al término de ésta. Los cerebros fueron colectados para la evaluación del daño celular. Además, se tomaron muestras sanguíneas para evaluar los indicadores gasométricos de...
Tipo: Journal article
Palavras-chave: Pirofosfato de tiamina; Hipoxia; Daño celular; Gasometría hemática.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200025

Morphological Description of Mandibular Canal in Panoramic Radiographs of Brazilian Subjects: Association Between Anatomic Characteristic and Clinical Procedures
Provedor de dados: 77
Autores: Amorim,Maise Mendonça; Borini,Cynthia Bicalho; Lopes,Sérgio Lúcio Pereira de Castro; Haiter-Neto,Francisco; Caria,Paulo Henrique Ferreira.
Morphological and topographic knowledge of the mandibular canal is of paramount importance during dental procedures in the jaw, as structures that go through this canal must be preserved. The aim of this study was to make a morphologic and morphometrical analysis of the course and relations of the mandibular canal of adult men and women, in two different age groups. The sample was composed of 300 panoramic radiographs divided into 4 groups: Groups F1 and F2: women (ranging between 18-40 years, and over 40 years of age, respectively); Groups M1 and M2:men (ranging between 18-40 years and over 40 years of age, respectively). Seven linear vertical measurements were performed in the radiographs to describe the course of the mandibular canal, and its and...
Tipo: Journal article
Palavras-chave: Mandibular canal; Mental foramen; Mandibular foramen; Morphometry.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400044

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

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

Relación Entre Escoliosis, Sexo y Lateralidad Manual en una Muestra de Escolares
Provedor de dados: 77
Autores: Fernández,M; Fernández,R; Zurita,F; Jiménez,C; Almagià,A; Yuing,T; Curilem,C.
De todo el conjunto de problemas que se desarrollan en la infancia, no cabe duda que la escoliosis ocupa un puesto importante debido a sus repercusiones en la edad temprana y adulta. El objetivo del estudio fue evaluar la relación existente entre el sexo, escoliosis y lateralidad manual. La muestra estuvo formada por 2822 participantes, con edad comprendida entre 6 y 12 años, pertenecientes a la provincia de Almería. Se utilizaron dos instrumentos de medida, es decir, inventario de lateralidad manual de Edinburgh y la prueba de Adams, para analizar las variables seleccionadas. No se encontraron diferencias estadísticamente significativas entre las variables lateralidad y sexo (p=0,106) ni entre lateralidad y escoliosis (p=0,673); pero sí entre escoliosis y...
Tipo: Journal article
Palavras-chave: Prevalencia; Escoliosis; Obesidad; Escolares; Columna Vertebral.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100003

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

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

EFFECTS OF PYRAZINAMIDE ON PREGNANT ALBINO RATS
Provedor de dados: 77
Autores: Pascale Quintino,Marisa; Simões,Manuel de Jesus; Uchiyama Nakamura,Mary; Martins Oliveira-Filho,Ricardo; Espiridião,Silvia; Kulay Júnior,Luiz.
Although being used for years in the treatment of tuberculosis, no data are available in the literature on the safety of pyrazinamide during pregnancy. Accordingly, we aimed to make a first approach to this problem by evaluating the effects of this drug administered during the entire pregnancy of albino rats. Fourty female, EPM-1 Wistar albino rats of about 250 g b.w. were used. Upon conception (day zero of pregnancy) the animals were randomly divided in 4 groups of 10 rats each and labeled as follows. Controls (C), animals treated with the drug vehicle (destilled water); experimental groups (E1, E2 and E3), animals treated with 35, 105 or 315 mg/kg b.w. pyrazinamide by gavage (oral route) once daily up to the term (20th day of pregnancy). Drug or vehicle...
Tipo: Journal article
Palavras-chave: Pyrazinamide; Toxicology; Rat; Pregnancy.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000400007

Tangential Algorithm for Calculation of the Fractal Dimension of Kidney Tubuli Sections
Provedor de dados: 77
Autores: Gil,Julio; Gimeno,Miguel; Laborda,Jesús; Nuviala,Javier; Belanche,Ignacio.
We have developed a new algorithm to calculate the fractal dimension of dog kidney proximal convoluted tubule section. This algorithm is intermediate between box-counting and perimeter-stepping algorithms. The result of this new algorithm and correlations found between fractal dimensions and other Euclidian values of these tubuli, suggest that this algorithm is adequate to calculate fractal dimensions by points
Tipo: Journal article
Palavras-chave: Fractal; Kidney; Proximal convoluted tubuli.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000100006

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

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

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

Polymorphism C373G of the PECAM-1 Gene in Chilean Subjects with Coronary Disease and Controls
Provedor de dados: 77
Autores: Herrera,Christian L; Jaramillo,Priscilla C; Lanas,Fernando; Salazar,Luis A.
The platelet endothelial cell adhesion molecule-1 (PECAM-1), a 130-kDa membrane glycoprotein, is expressed on the surface of monocytes, some T-lymphocyte subsets, neutrophils, platelets and endothelial cells. PECAM-1 plays a key role in the transendothelial migration of circulating leukocytes during vascular inflammation. The aim of the present investigation was to evaluate the association between the C373G polymorphism of the PECAM-1 gene and coronary artery disease in Chilean subjects. A total of 220 individuals were investigated (112 cases and 108 controls). The presence of coronary artery disease was confirmed by angiography (Stenosis &gt;70%). The C373G polymorphism was detected by polymerase chain reaction followed enzymatic restriction. The genotype...
Tipo: Journal article
Palavras-chave: Aterosclerosis; PECAM-1; Polymorphism.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200031

Effects of Fetal Programming in the Inflammatory Response in Wistar Rats: A Systematic Review
Provedor de dados: 77
Autores: Assis,Thiago de Oliveira; Araújo Filho,José Candido de; Maia,Maria Bernadete de Sousa.
The aim of this study was to review the literature on the effects of fetal programming in the inflammatory response in Wistar rats. A search was performed in the following databases: PubMed, MEDLINE, PUBMED, SCIENCE DIRECT, SCOPUS, LILACS, SpringerLink. The main search terms were malnutrition and inflammation in Portuguese and in English. Original articles were included involving albino rats and review articles were excluded involving humans or animals other than rats. Articles that were related to malnutrition which was not intrauterine and did not involve the concept of fetal programming were also excluded.Those items found in more than one database were counted only once. Sixteen articles were found in PUBMED, 16 in SCOPUS, 4 in MEDLINE, 341 in SCIENCE...
Tipo: Journal article
Palavras-chave: Fetal Programming; Inflammation; Wistar Rats; Systematic review.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400048

Use of 3D Multislide CT in the Study of a Fetus with Cyclopia
Provedor de dados: 77
Autores: Pachajoa,Harry; Vejarano,Luis Eduardo; Isaza,Carolina.
Cyclopia is a rare congenital malformation incompatible with life; it is characterized by the presence of a single eye in the center position, secondary to alobar holoprosencephaly. Cyclopia etiology is heterogeneous, with a prevalence of 1.05 in 100,000 births. We report a case of cyclopia with sinoftalmía in a fetus of 21 weeks where they use 3D multislice computed tomography as a complementary study.
Tipo: Journal article
Palavras-chave: Cyclopia; Holoprosencephaly; Computer tomography; Prenatal diagnosis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100015

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

Research of Viral Agent in Free-living Pigeon Feces (Columba livia) in the City of São Paulo, SP, Brazil, for Transmission Electron Microscopy
Provedor de dados: 77
Autores: Catroxo,M. H. B; Martins,A. M. C. R. P. F; Petrella,S; Curi,N. A; Melo,N.A.
The pigeon feces are vehicle of diseases both for humans and other animal species. In these birds, the most important viral diseases of the digestive tract are transmitted by the paramyxovirus, adenovirus and coronavirus. Avian paramyxoviruses have been isolated from a variety of species of free living and domestic birds worldwide, with several symptoms and clinical signs and economic losses. Paramyxoviruses belong to the Paramyxoviridae family and Avulovirus genus that includes nine serotypes (APMV 1 to 9). Avian adenoviruses belong to the Adenoviridae family and Aviadenovirus genus. In pigeons, cause classical adenovirosis and necrotizing hepatitis. The respiratory and enteric tracts are common targets of coronavirus. They belong to the Coronaviridae...
Tipo: Journal article
Palavras-chave: Paramyxovirus; Adenovirus; Coronavirus; Pigeons; Transmission electron microscopy.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000200055

Histological Characterization of Sacco's Concentrated Growth Factors Membrane
Provedor de dados: 77
Autores: Bernardi,Sara; Mummolo,Stefano; Tecco,Simona; Continenza,Maria Adelaide; Marzo,Giuseppe.
Along with the emerging needs of the dental patients, numerous techniques for oral tissue stimulation and regeneration were developed to be employed in the modern implant rehabilitation therapies. The Concentrated Growth Factors (CGF) are a relatively new therapeutic presidium that can be used for this purpose, enhancing the regenerative potential property of blood cells. Although literature presents numerous studies evaluating the CGF for their clinical uses and efficacy, data regarding their biological characteristics are very few. The present study evaluates and describes the CGF structural morphology by means of classical histological methods, using haematoxilin-eosin and azan mallory stains. A three layers organization with a fibrin complex network...
Tipo: Journal article
Palavras-chave: Histology; Guided bone regeneration; Implant dentistry; Concentrated growth factor.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100019

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

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

Músculo Elevador de la Escápula: Caracterización Macroscópica
Provedor de dados: 77
Autores: Mardones Valdivieso,Felipe; Rodríguez Torres,Alberto.
Nuevas técnicas y aplicaciones quirúrgicas han impulsado un mayor estudio anatómico del músculo elevador de la escápula. Sin embargo, persisten interrogantes sobre su morfología, las que son de importancia al considerarlo como una herramienta reconstructiva. Se trabajó con 11 cadáveres (ocho masculinos y tres femeninos) con edad promedio de 70 años. Se realizó una disección bilateral por planos de las regiones cervical y escapular en 9 preparados, en 2 casos fue unilateral. Fueron analizadas variables macroscópicas como: conformación general, ubicación, origen e inserción, relaciones directas y variaciones. Ubicado en las regiones cervicales posterior y lateral, y escapular, su forma asemeja una cincha, conformado por fascículos musculares hacia su origen...
Tipo: Journal article
Palavras-chave: Morfología; Músculo elevador de la escápula; Hipaxial.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300021

Morphometric and High Resolution Scanning Electron Microscopy Study of Calomys callosus Major Palatine Nerve
Provedor de dados: 77
Autores: Tanisaki,Maurício; Ogawa,Koichi; Lapa,Rita de Cássia Ribeiro da Silva; da Silva,Marcelo Cavenaghi Pereira; Watanabe,Ii-sei.
The characteristics of Calomys callosus major palatine nerve were studied employing light, transmission and high resolution scanning electron microscopy methods. For light microscopy, the specimens were fixed in Bouin's fixative solution, processed routinely and the sections were stained with hematoxylin­eosin and Azo-Carmin to identify nerve fibers. For high resolution scanning electron microscopy the O-D-O method reported by &lt;a href="#13"&gt;Tanaka (1989)&lt;/a&gt; was used to examine nerve fiber components and to measure the myelin sheath. Thin sections were examined by transmission electron microscopy to show axoplasmic elements and adjacent structures. The results revealed nerve fiber bundles in the lamina propria of Calomys callosus palatine...
Tipo: Journal article
Palavras-chave: Major palatine nerve; HRSEM; TEM; Calomys callosus; Myelin sheath; Morphometric.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000100003

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

Prevalencia del uso de Epónimos en Publicaciones y Ponencias del 18th Congress of International Federation of Associations of Anatomists 2014
Provedor de dados: 77
Autores: Duque Parra,Jorge Eduardo; Barco Ríos,John; Vélez García,Juan Fernando.
La Terminologia Anatomica se usa internacionalmente como referente de los términos propios de la morfología, en la que no se utilizan epónimos, pues no hacen referencia a ningún detalle anatómico ni funcional relevante, pero sí traen a la memoria los nombres de personas, complejizando el aprendizaje y la comunicación. El objetivo del presente trabajo fue estudiar la prevalencia de epónimos usados durante la realización del 18th Congress of International Federation of Associations of Anatomists, realizado en Beijing -China- en el año 2014. Se analizaron aleatoriamente cinco presentaciones orales y las trescientas presentaciones formales en la modalidad de poster durante el congreso, buscando el uso de epónimos. Aunque hubo un porcentaje muy bajo de...
Tipo: Journal article
Palavras-chave: Educación Médica; Epónimo; Terminologia Anatomica.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200023

Pelvimetry by Reformatted Computed Tomography in 290 Female Pelvis: Morphometric Variations Regarding Age
Provedor de dados: 77
Autores: Vázquez-Barragán,Miguel Ángel; Garza-Báez,Azalea; Morales-Avalos,Rodolfo; Martínez-González,Brenda; Jacobo-Baca,Guillermo; Pinales-Razo,Ricardo; Quiroga-Garza,Alejandro; de la Fuente-Villarreal,David; Elizondo-Riojas,Guillermo; Elizondo-Omaña,Rodrigo E; Guzmán-López,Santos.
The Mexican government passed a new reform of article 11 of the General Law in 2014 regarding Women's Access to a Life Free of Violence, which states that a cesarean section may not be performed if a vaginal birth is viable. Cesarean sections are excessively indicated in Northen Mexico, using the diagnosis of cephalopelvic disproportion due to a narrow pelvis. Currently, there is no standardized morphometry of the female pelvis in a Mexican population to establish adequate diagnostic parameter. Our study measures the pelvic diameters of the birth canal using abdominopelvic computed tomography (CT). Two hundred and ninety CT from Mexican women between the ages of 18 and 50 were collected and 3D reformatted in order to morphologically measure the pelvic...
Tipo: Journal article
Palavras-chave: Pelvimetry; Cesarean; Cephalopelvic disproportion; Reformatted CT; Morphometry; Mexico.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100043

Formaciones Venosas de la Fosa Cubital en el Individuo Mapuche: Estudio Bioscópico
Provedor de dados: 77
Autores: del Sol,Mariano; Lagos Mardones,Miguel; Torres Bustos,Edison.
Las venas superficiales de la fosa cubital constituyen uno de los sitios más importantes para punción venosa. La disposición de esas venas presenta numerosas variaciones y, la disposición de ellas no ha sido estudiada en el grupo étnico mapuche. Debido a esto, y considerando a este grupo como el mayor conglomerado étnico de América del Sur, efectuamos este estudio. Fueron analizadas las venas superficiales de la fosa cubital, en 300 miembros superiores (150 derechos y 150 izquierdos) de individuos de ambos sexos (30 hombres y 120 mujeres), chilenos del grupo étnico mapuche, con edades entre 15 y 84 años. El estudio fue realizado en las postas rurales adyacentes a la ciudad de Temuco. Basados en la clasificación de del Sol et al. (1988) para las formaciones...
Tipo: Journal article
Palavras-chave: Anatomía; Venas de la fosa cubital; Sitios de punción venosa.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400033

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

Toxic Effects of Methanolic Extract of Aspilia africana Leaf on the Estrous Cycle and Uterine Tissues of Wistar Rats
Provedor de dados: 77
Autores: Oluyemi,Kayode A; Okwuonu,Uche C; Baxter,D. Grillo; Oyesola,Tolulope, O.
Effects of graded dosages of methanolic extract of Aspilia Africana were examined on the estrous cycle, uterine weights and histology to determine its effects on the reproductive functions of 25 cyclic female rats. The rats were randomized into five groups A, B, C, D, and E. They were given Omg/kg body weight, 150 mg/kg body weight, 200 mg/kg body weight, 250 mg/kg body weight, and 300 mg/kg body weight, respectively. The effect on the estrous cycle was determined by vaginal lavage while routine histological preparations were done with haematoxylin-eosin stains. All values were statistically compared at appropriate confidence intervals. Estrous cycles were significantly reduced in a dose-dependent manner and histology revealed a dose-dependent toxicity
Tipo: Journal article
Palavras-chave: Aspilia africana; Estrous; Uterine weight; Histology; Reproductive functions.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300023

Evaluación de la Anatomía Mandibular Relacionada con la Osteotomía Sagital de la Rama
Provedor de dados: 77
Autores: Salgado A,Guillermo; Inzunza H,Oscar; Cantín,Mario; Fuentes,Ramón; Inostroza,Verónica; Errázuriz,María Jesús; Pavez,Cindy.
La osteotomía sagital de la rama mandibular (SSRO) es una de las técnicas quirúrgicas más frecuentes para corregir las deformidades de la mandíbula. Con el fin de prevenir problemas anatómicos y quirúrgicos, los cirujanos requieren una mayor investigación sobre las estructuras anatómicas relacionadas con la SSRO. El objetivo de este estudio fue investigar las posiciones de la antilingula (AL), la entrada al nervio alveolar inferior (NAI) en la mandíbula y otros puntos de referencia anatómicos en relación con la língula mandibular (L). Fueron estudiadas 70 hemimandíbulas secas. La AL y los demás puntos de referencia y, la posición correspondiente de la L se marcaron en la cara medial y lateral de la rama mandibular respectivamente. Fueron medidas las...
Tipo: Journal article
Palavras-chave: Osteotomía sagital de la rama; Mandíbula; Puntos de referencia anatómicos; Antilingula; Língula; Nervio alveolar inferior.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100005

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

Morphological and Morphometric Study of the Muscle Fibers and Neuromuscular Junctions of the Extensor Digitorum Longus in Aged Rats Submitted to Maternal Protein Restriction
Provedor de dados: 77
Autores: Jeronimo,L. C; Confortim,H. D; Centenaro,L. A; Brancalhão,R. M. C; Pinheiro,P. F. F; Matheus,S. M. M; Torrejais,M. M.
Protein restriction implies the functional involvement of several systems and organs, including the skeletal muscle, because it is a protein reservoir in the body. This study sought to analyze the morphological and morphometric features of the muscle fibers and neuromuscular junctions (NMJs) of the extensor digitorum longus (EDL) muscle in rats at 365 days of age, submitted to maternal protein restriction during the gestation and lactation periods. Wistar rats were divided into two groups: a Control Group - mothers fed a normal-protein diet (17 % protein) during pregnancy and lactation; and a Restricted Group - mothers fed a low-protein diet (6 % protein) during pregnancy and lactation. The pups were kept with the mother throughout the lactation period (21...
Tipo: Journal article
Palavras-chave: Morphology; Morphometry; Protein restriction; Extensor digitorum longus muscle; Rat.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100057

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

Optical Densitometry Study of the Newly Formed Bone Using rhBMP-2 in Wistar Rat Mandibles
Provedor de dados: 77
Autores: Issa,Joáo Paulo Mardegan; Nascimento,Cássio do; Sato,Sandra; Barbosa,Rodrigo Edson Santos; Benetti,Emerson Toffanello; Albuquerque Junior,Rubens Ferreira de.
The purpose of this study was to evaluate the efficacy of monoolein gel as a carrier for rhBMP-2 in the healing bone process of critical bone defects created in Wistar rats mandibles using digitalized radiographic method to analyze this process. In the group 1, the rhBMP-2 was dissolved in aqueous solution and in the group 2, the rhBMP-2 was combined with monoolein gel as a carrier. The results showed that in both of groups it was found efficient bone repair, with a great optical density in the group that the rhBMP-2 was combined with the monoolein gel, but without statistical difference between them
Tipo: Journal article
Palavras-chave: Optical densitometry; RhBMP-2; Monoolein; Bone defects.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200018

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

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

Prenatal Development of Pelvic Urethra in Goat (Capra hircus)
Provedor de dados: 77
Autores: Vrema,Abhinov; Archana,P; Farooqui,M. M; Prakash,Ajay.
The study was conducted on the embryo/foeti of goat from 0-150 days of gestation, divided into group I (0-30 days), group II (31-60 days), group III (61-90 days), group IV (91-120 days) and group V (121-150 days of gestation). In group I whole embryo was processed and serial sections were cut whereas, in rest of the groups, pelvic urethra was dissected out and the tissues from the representative areas were used for the study. Grossly, on 49.33 days of gestation the pelvic urethra was present in the form of smooth cylindrical tube, approximately 4mm in length. The primordial of vesicular gland and bulbourethral gland appeared on 52 days of gestation at the junction of neck of urinary bladder with pelvic urethra and at the junction of pelvic and penile...
Tipo: Journal article
Palavras-chave: Anatomy; Histology; Pelvic urethra; Goat.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200062

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

Regenerative Capacity and Histomorphometric Changes in Rat Sciatic Nerve Following Experimental Neurotmesis
Provedor de dados: 77
Autores: Lós,Deniele Bezerra; Novaes,Karyne Albino; de Miranda,Filipe Barbosa Cunha; Lira,Kamilla Dinah Santos de; Andrade,Rodrigo Fragoso de; Moraes,Sílvia Regina Arruda de.
Through a wide range of cellular and molecular events, the peripheral nervous system is endowed with great regenerative capacity, responding immediately to injuries that occur along the length of the nerve. The aim of this study was to histomorphometrically assess the degree of maturity of the nervous tissue and possible microscopic changes in newly formed nerve segments 60 days after experimental neurotmesis of the sciatic nerve in rats. Control Group (CG) and an Injury Group (IG) were used. IG underwent neurotmesis of the sciatic nerve of the right foot, with immediate surgical repair using the tubulization technique. 60 days following experimental surgery, animals from both groups had their sciatic nerves collected for histomorphometric analysis....
Tipo: Journal article
Palavras-chave: Nerve Tissue; Nerve Regeneration; Peripheral Nerve Injuries; Vasa nervorum; Histology.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200056

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

Triple Right Renal Vein: An Uncommon Variation
Provedor de dados: 77
Autores: Fernandes,R. M. P.; Conte,F. H. P.; Favorito,L. A.; Abidu-Figueiredo,M.; Babinski,M. A.
We report an unilateral three renal veins the right kidney in an elderly male cadaver. They were three calibrous veins having independent courses up to the inferior vena cava. No other vascular anomalies were noted in this specimen. 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; Human; Kidney; Vein.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000300007

Gross Anatomy of the Heart in the Western Grey Kangaroo (Macropus fuliginosus)
Provedor de dados: 77
Autores: Lima,Martin; Méndez,Virginia; Pérez,William.
The aim of this study was provide a description of the macroscopic heart anatomy of the kangaroo Macropus fuliginosus. The terms of the Nomina Anatomica Veterinaria were employed. Heart did not have interventricular sulcus. Auricles were located in both faces of the heart. Right ventricle had slight septomarginal trabecula that extended between papilar muscles and the parietal wall. Right ventricle parietal wall had plenty of trabecula carneae. Septal wall was smooth and had three papilar muscles. Papilar muscles of left ventricle were two and they were located over parietal wall. Septal walls and parietal of left ventricle were full of trabecula carneae that surrounded papilar muscles. Two vessels derived from the aorta, right and left sinus coronary...
Tipo: Journal article
Palavras-chave: Animal anatomy; Heart anatomy; Zoo animals; Macropus; Coronary vessels.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400024

Effects of Formaldehyde and Vimentin Expression in Rat Skin
Provedor de dados: 77
Autores: Kalkanli,Sevgi; Kalkanli,Nevin; Deveci,Engin; Dal,Tuba; Baran,Özlem.
The Wistar rats ( 9 weeks old, 180­200 g body weight) used in these trials were divided into two groups of 16 animals each (Control group and Experimental group). 100x65x100 in the sizes of the experimental group were taken into a glass vase. During the time period of 8 weeks, 5 days a week with 8 hours the inhalation of 10 ppm formaldehyde was made. Skin was removed and placed in 10% formaline. Sections were stained with Hematoxylene-Eosine, Trichrome-Masson and observed under light microscope. In this study, histopathological and immunohistochemical techniques due to the impact of the changes in formaldehyde and examined the distribution of vimentin.
Tipo: Journal article
Palavras-chave: Formaldehyde; Skin; Vimentin.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300011

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

Walter Thiel's Embalming Method: Review of Solutions and Applications in Different Fields of Biomedical Research
Provedor de dados: 77
Autores: Ottone,Nicolás Ernesto; Vargas,Claudia A; Fuentes,Ramón; del Sol,Mariano.
Walter Thiel developed the method that enables preservation of the body with natural colors in 1992. It consists in the application of an intravascular injection formula, and maintaining the corps submerged for a determinate period of time in the immersion solution in the pool. After immersion, it is possible to maintain the corps in a hermetically sealed container, thus avoiding dehydration outside the pool. The aim of this work was to review the Thiel method, searching all scientific articles describing this technique from its development point of view, and application in anatomy and morphology teaching, as well as in clinical and surgical practice. Most of these studies were carried out in Europe. We used PubMed, Ebsco and Embase databases with the...
Tipo: Journal article
Palavras-chave: Embalming; Dissection; Walter Thiel; Surgical training; Review.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400044

Fractal Dimension of Dog Kidney Proximal Convoluted Tubuli Sections by Mean Box-Counting Algorithm
Provedor de dados: 77
Autores: Gil,Julio; Gimeno,Miguel; Laborda,Jesús; Nuviala,Javier.
The possibility of characterizing the proximal convoluted tubuli of the dog kidney by means of a unique and objective value, is an attractive idea in order to automate its recognition in anatomy and patology. For this, we obtained a fractal dimension of the proximal convoluted tubuli in the dog kidney by mean box-counting method. The fractal value we obtained is a flat dimension, and it is different than the line fractal dimension of the dog kidney arterial pattern, which was previously calculated by us (Gil et al., 2006). Thus, from optical microscopy images, we are able to obtain a single quantitative measure to discriminate these dog kidney components. This measures can use to automate its recognition. Fractal geometry provides many advantages when...
Tipo: Journal article
Palavras-chave: Fractal; Kidney; Proximal convoluted tubuli.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500005

In vitro Analysis of Morphology of Human Enamel Submitted to Excessive Use of External Bleaching Agents
Provedor de dados: 77
Autores: Junqueira,Rafael Binato; Carvalho,Rodrigo Furtado de; Antunes,Alberto Nogueira da Gama; Rodrigues,Sonia Sotto-Maior Fortes Garcia; Oliveira,Roberto Sotto-Maior Fortes de; Salvio,Luciana Andrea.
The aim of this study was to evaluate the effects of external bleaching agents on morphology of human enamel after excessive homemade dental bleaching. 20 intact human third molars were submitted to mesio-distal crosscut and embedded in polystyrene resin. The specimens were submitted to finish and a half of enamel surface of each specimen was covered with cosmetic varnish, meaning control group (G0). The specimens were randomly divided into four groups (n=10): G1 ­ 1 bleaching session by 16% carbamide peroxide; G2 ­ 3 bleaching sessions by 16% carbamide peroxide; G3 ­ 1 bleaching session by 22% carbamide peroxide; G4 ­ 3 bleaching sessions by 22% carbamide peroxide. Each session lasted 8 hours a day, during two weeks, with 45 days of interval between...
Tipo: Journal article
Palavras-chave: Dental bleaching; Dental enamel; Peroxides.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100020

Metformin Induces Ultrastructural Alterations in Hepatocytes of Spontaneously Hypertensive Rats
Provedor de dados: 77
Autores: Gharbaran,Rajendra.
Metformin, an oral biguanide approved for the treatment of type II diabetes is widely prescribed for other clinical conditions. Currently, metformin is being investigated as potential anti-tumor agent. However, there have been recent concerns about hepatotoxicity associated with the use of metformin. This study, by means of high resolution transmission electron microscopy (TEM) and morphometry, investigated potential ultrastructural changes induced by metformin treatment on the hepatocytes of spontaneously hypertensive rats (SHR). Morphometric analysis was carried out on images of randomly selected cells from sectioned gluteraldehyde-osmium-fixed, Epon embedded liver tissue. One-way analysis of variance (ANOVA) on morphometric data showed statistically...
Tipo: Journal article
Palavras-chave: Metformin; Rats; TEM; Cancer; Diabetes.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300016

Formation of the Azygos Vein
Provedor de dados: 77
Autores: Alves,Elton Correia; Porciúncula Junior,Wellington Rodrigues; Monte Bispo,Rodrigo Freitas; Sousa-Rodrigues,Célio Fernando de; da Rocha,Amauri Clemente.
The aim of the present study was to determine the most common origin of the azygos vein. Thirty cadavers male and female, white and non-white adult individuals of different ages fixed in 10% formaldehyde and dissected. All cadavers had an undisclosed clinical death and were donated to the Universidade Estadual de Ciências da Saúde de Alagoa s, Brazil. Eleven different formations were found. The right subcostal vein was was only observed in 13 cases (43.33%); the azygos vein was formed by the confluence of the right subcostal and right ascending lumbar vein in three cases (10%); by the right subcostal vein with a contribution from the inferior vena cava (IVC) in three cases (10%); by the right subcostal with contribution from IVC and right ascending lumbar...
Tipo: Journal article
Palavras-chave: Azygos vein; Inferior vena cava inferior; Anatomy.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100024

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

Trígono Cistohepático: Área Crítica Anatómica para la Seguridad Quirúrgica
Provedor de dados: 77
Autores: Algieri,Rubén Daniel; Ferrante,María Soledad; Ugartemendía,Juan Sebastián; Bernadou,María de las Mercedes; Pina,Lucas; Álvarez Escalante,Agustín.
El conocimiento de la anatomía de la vía biliar y sus variantes para la realización de una cirugía segura, resulta fundamental. La extirpación de la vesícula requiere cuidadosa atención, conocer muy bien la anatomía de la región, teniendo en cuenta la posibilidad de variaciones anatómicas. La mala interpretación de la anatomía percibida más que una falta en la destreza técnica es la causa de la lesión de la vía biliar durante la colecistectomía. Diferenciar el límite y el contenido del trígono cistohepático. Diseñar las áreas de Visión Crítica y de Seguridad como medida de seguridad en el paciente quirúrgico. Revisión de 458 partes quirúrgicos de colecistectomías de enero/2010 a octubre/2012, en el Servicio de Cirugía General del Hospital Aeronáutico...
Tipo: Journal article
Palavras-chave: Trígono cistohepático; Triángulo hepatocístico; Triángulo de Calot; Triángulo de Buddé.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300019

Estimation of Cranial Capacity in 17-26 Years Old University Students
Provedor de dados: 77
Autores: Acer,Niyazi; Usanmaz,Mustafa; Tugay,Urnut; Erteki'n,Tolga.
It is natural that there is close relationship between cranial capacity, and the size of brain. Several studies have estimated the cranial capacity which indirectly reflects the brain volume. This study was carried out on 366 (226 male and 140 female) healthy university students aged between 17-26 years old at Mugla University, Mugla, Turkey. By using linear dimensions of the head the mean cranial capacity and SD in males and females were 1411.64+118.9 cm³ and 1306.95+162.9 cm³, respectively. There was a significant difference between genders (p&lt;0.05). This investigation was showed the cranial capacity is larger in males than females. We also proposed a regression formula that could be used to predict the cranial capacity
Tipo: Journal article
Palavras-chave: Craniometry; Cranial capacity; Regresión formula.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100008

EVALUACIÓN DEL APRENDIZAJE PRÁCTICO DE LA ANATOMÍA HUMANA PARA ODONTOLOGÍA EN LA UNIVERSIDAD DE ANTOFAGASTA, CHILE
Provedor de dados: 77
Autores: García-Hernández,Fernando.
El laboratorio de anatomía cumple el rol de transformar conceptos teóricos en algo concreto. Es una actividad única, ineludible, irreemplazable, irrecuperable e indispensable para lograr objetivos educacionales. El cadáver ha sido el principal método de aprendizaje; sin embargo, las dificultades para obtener material cadavérico ha estimulado el uso de nuevos medios didácticos. Desde 1997, año en que se inicia la docencia anatómica para Odontología en la Universidad de Antofagasta, hemos buscado el mejor método para comprobar el logro de objetivos, realizando evaluaciones al final del laboratorio empleando material cadavérico o, en su reemplazo, láminas y dibujos que sirvieran para identificar estructuras. La investigación docente plantea la hipótesis de...
Tipo: Journal article
Palavras-chave: Anatomía; Odontología; Evaluación.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000100007

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

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

Incidental Splenic Injury and Splenectomy: An Overview Based on Available Evidence
Provedor de dados: 77
Autores: Manterola,Carlos; Otzen,Tamara.
Splenectomy indications are hematologic disease, traumatic damage and iatrogenic injury. The aim of this study was to present an evidence-based overview of some clinical aspects of interest related with iatrogenic splenic injury and subsequent splenectomy. An overview of the available evidence was conducted. Articles that evaluated clinical aspects of interest related with iatrogenic splenic injury and subsequent splenectomy, without language limits, publication date and designs. BVS, PubMed, SciELO and TRIP databases were reviewed. Evaluated variables were: Frequency and etiology of surgical spleen injuries, treatment options, frequency of splenectomy, associated postoperative morbidity (POM) and mortality, recommendation for splenectomy. Classification...
Tipo: Journal article
Palavras-chave: "Splenectomy"; "Digestive System Surgical Procedures"; Gastrointestinal Surgical Procedures; Antireflux surgery; Postoperative morbidity.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400058

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

The Accessory Soleus Muscle: Case Report and a Review of the Literature
Provedor de dados: 77
Autores: Reis,Francisco Prado; Aragão,José Aderval; Fernandes,Atson Carlos de Souza; Feitosa,Vera Lucia Corrêa; Fakhouri,Ricardo; Nunes,Marco Antonio Prado.
An accessory soleus muscle was found in the left leg of a male cadaver in the dissecting room. The muscle was situaded posteromedially, between the soleus muscle and the flexor digitorum longus and flexor hallucis longus. The origin of the muscle was in the superior third of the anterior fascia of the soleus muscle and the insertion, was attached with separate tendon, in the anteromedial surface of calcaneus bone
Tipo: Journal article
Palavras-chave: Muscle; Accessory soleus muscle; Anatomical variation.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000400032

VII CONGRESO INTERNACIONAL SOCIEDAD DE ANDROLOGÍA Y GAMETOLOGÍA DE CHILE IX JORNADAS INTERNACIONALES DE VERANO EN MEDICINA REPRODUCTIVA Y BIOTECNOLOGIA
Provedor de dados: 77
Tipo: Journal article
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100029