Browsing by Author "d1704d50-7d64-4adb-aca0-ddf13344621f"
Now showing items 1-20 of 58
-
Artificial neural networks applied to quantitative elemental analysis of organic material using PIXE
Correa, Rafael; Chesta, Miguel Ángel; Dinator Ramírez, María Inés; Morales Peña, José; Requena, I.; Vila Pinto, Irma (ELSEVIER, 2006-08)An artificial neural network (ANN) has been trained with real-sample PIXE (particle X-ray induced emission) spectra of organic substances. Following the training stage ANN was applied to a subset of similar samples thus ... -
Bacterial communities associated with spherical Nostoc macrocolonies
Aguilar, Pablo; Dorador, Cristina; Vila Pinto, Irma; Sommaruga, Ruben (Frontiers Media S.A., 2019)Copyright © 2019 Aguilar, Dorador, Vila and Sommaruga.Species of the genus Nostoc (Cyanobacteria) can form large colonies of up to several centimeters in diameter that may represent a unique habitat for bacteria in ... -
Bacterial diversity in the sediments of a temperate artificial lake, Rapel reservoir
Dorador, Cristina; Castillo, Gabriela; Witzel, Karl-Paul; Vila Pinto, Irma (2007)Rape] reservoir is an eutrophic system in Chile that has undergone a series of anthropogenic impacts in recent decades. To provide a better understanding of the processes occurring in the reservoir, we examined bacterial ... -
Bacterial diversity in the sediments of a temperate artificial lake, Rapel reservoir
Dorador, Cristina; Castillo, Gabriela; Witzel, Karl-Paul; Vila Pinto, Irma (2007)Rape] reservoir is an eutrophic system in Chile that has undergone a series of anthropogenic impacts in recent decades. To provide a better understanding of the processes occurring in the reservoir, we examined bacterial ... -
Bacterioplankton composition in tropical high elevation lakes of the Andean plateau
Aguilar, Pablo; Dorador, Cristina; Vila Pinto, Irma; Sommaruga, Ruben (Oxford University Press, 2018)High-elevation lakes in the tropics are subject to extreme environmental fluctuations and microbes may harbor a unique genomic repertoire, but their composition and diversity are largely unknown. Here, we compared the ... -
Bacterioplankton composition in tropical high-elevation lakes of the Andean plateau
Aguilar, Pablo; Dorador, Cristina; Vila Pinto, Irma; Sommaruga, Ruben (Oxford University Press, 2018)© FEMS 2018. High-elevation lakes in the tropics are subject to extreme environmental fluctuations and microbes may harbor a unique genomic repertoire, but their composition and diversity are largely unknown. Here, we ... -
Caracterización trófica de Orestias (Teleostei: Cyprinodontidae) en el Parque Nacional Lauca
Guerrero, Claudia J.; Poulin, Elie; Méndez, Marco; Vila Pinto, Irma (Universidad de Concepción. Facultad de Ciencias Naturales y Oceanográficas., 2015)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 ... -
Chromosomal organization of four classes of repetitive DNA sequences in killifish Orestias ascotanensis Parenti, 1984 (Cyprinodontiformes, Cyprinodontidae)
Araya Jaime, Cristián; Lam Pastén, Natalia; Vila Pinto, Irma; Méndez, Marco; Iturra Constant, Iris (Pensoft Publishers, 2017)Orestias Valenciennes, 1839 is a genus of freshwater fish endemic to the South American Altiplano. Cytogenetic studies of these species have focused on conventional karyotyping. The aim of this study was to use classical ... -
Ciclo de vida de un poliqueto dulceacuícola de origen Gondwánico Stratiodrilus Aeglaphilus (Annelida: Eunicida: Histriobdellidae), comensal de Aegla laevis (Crustacea: Anomura) Life cycle of a freshwater Gondwanic remnant polychaete Stratiodrilus aeglaphi
Vila Pinto, Irma; Véliz, David (Universidad de Concepcion, 2014)© 2014, Universidad de Concepcion. All rights reserved. Within the Annelida phylum, the Histriobdellidae Family groups freshwater polychaetes sharing an ancient Gondwanic relationship; very little is known about their life ... -
Competitive interaction between introduced rainbow trout and native silverside in a Chilean stream
Pardo, R.; Vila Pinto, Irma; Capella, J. J. (Springer Netherlands, 2009)The field experiment presented here elucidates the competitive effect of exotic trout on Chilean silverside. This is the first local experimental work that demonstrates the negative effect of trout on native fish from ... -
Cyanobacterial diversity in Salar de Huasco, a high altitude saline wetland in northern Chile: an example of geographical dispersion?
Dorador, Cristina; Vila Pinto, Irma; Imhoff, Johannes F.; Witzel, Karl-Paul (BLACKWELL, 2008-06)The diversity of Cyanobacteria in water and sediment samples from four representative sites of the Salar de Huasco was examined using denaturing gradient gel electrophoresis and analysis of clone libraries of 16S rRNA gene ... -
Demographic response of Stratiodrilus aeglaphilus (Anelida, Histriobdellidae) to organic enrichment: experimental assessment
Pardo, Rodrigo; Vila Pinto, Irma; Bustamante Araya, Ramiro (SPRINGER, 2007-09-09)Demographic responses of a commensal annelid of freshwater crayfish, Stratiodrilus aeglaphilus, to a sublethal organic enrichment were tested. Censuses of the S. aeglaphilus population were performed every 3 days during ... -
Differential gene expression revealed with RNA-Seq and parallel genotype selection of the ornithine decarboxylase gene in fish inhabiting polluted areas
Vega Retter, Caren; Rojas Hernández, N.; Vila Pinto, Irma; Espejo, R.; Loyola, D. E.; Copaja Castillo, Sylvia; Briones, M.; Nolte, A. W.; Véliz Baeza, David (Nature Publishing Group, 2018)How organisms adapt to unfavorable environmental conditions by means of plasticity or selection of favorable genetic variants is a central issue in evolutionary biology. In the Maipo River basin, the fish Basilichthys ... -
Effect of zinc and benzalkonium chloride on Nitrosomonas communis and potential nitrification in soil
Gagneten Dalla Fontana, Ana María; Vila Pinto, Irma (2001)A bacterial contact assay is described which uses a chemoautotrophic microorganism, Nitrosomonas communis (strain Nm2) to evaluate the biological effect of contaminated soils. The effects of two toxicants on the ammonium ... -
Effects of a Dam Reservoir on the Distribution of Heavy Metals in Two Chilean Native Freshwater Fish Species
Copaja Castillo, Sylvia; Muñoz, G. S.; Núñez, V. R.; Pérez, C.; Vila Pinto, Irma; Véliz Baeza, David (Springer, 2016)In order to determine the effect of a dam on metal concentrations in riverine fish species, we studied fish inhabiting the influent (Cachapoal River) and effluent (Rapel River) of the Rapel Reservoir in central Chile. Heavy ... -
Effects of Cu+2 and pH on the fitness of Ceriodaphnia dubia (Richard 1894) (Crustacea, Cladocera) in microcosm experiments
Gagneten Dalla Fontana, Ana María; Vila Pinto, Irma (2001)An important disturbance of anthropogenic origin frequently occurring in freshwater ecosystems is a rise in the concentration of heavy metals in solution, among which copper stands out due to its known toxicity. However, ... -
Embryological development of the high-altitude killifish Orestias ascotanensis Parenti 1984 (Teleostei: Cyprinodontidae)
Macaya, Consuelo; Lam, Natalia; Vila Pinto, Irma (Springer Netherlands, 2019)Orestias ascotanensis Parenti is a critically-endangered fish species endemic to the Ascotán salt pan springs. Given the importance of reproduction and early development in effective conservation of fish populations, this ... -
Extremophiles: photosynthetic systems in a high-altitude saline basin (Altiplano, Chile)
Angel, Alejandro; Vila Pinto, Irma; Herrera, Venecia (Springer Verlag, 2016)© 2016, The Author(s). Studies of different hypersaline systems have revealed various types of limitation. We evaluated the phototrophic microbial assemblages over a whole seasonal cycle (wet vs dry) in the Salar de Alconcha, ... -
Freshwater fishes of the Altiplano
Vila Pinto, Irma; Pardo, Rodrigo; Scott, Sergio (2007)Fisheries of the Altiplano, dating from 1500 to 2000 BC, are active in the Andean inter-montane plateau that extends from Ancash, Peru, to Antofagasta, Chile, at altitudes above 3600 m. The ancient and remote nature of ... -
Genetic structure in remnant populations of an endangered cyprinodontid fish, Orestias ascotanensis, endemic to the Ascotán salt pan of the Altiplano
Morales, Pamela; Vila Pinto, Irma; Poulin, Elie (2011)The impact of recent habitat fragmentation on population genetic diversity and structure has often been studied, mainly related to anthropogenic causes; however its long-term effect has been much less evaluated. In this ...