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Search Results: 1 - 10 of 11045 matches for " Jonathan URRUTIA "
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Evaluación del estado de conservación de cuatro especies de aves de la familia Rhinocryptidae en un área silvestre protegida en el Sur de Chile
SOTO-MORA, Yenny;URRUTIA, Jonathan;
Acta zoológica mexicana , 2010,
Abstract: in chile, the richness of endemic birds has been threatened by destruction processes of their natural habitats. due to this being evaluated the conservation status of four species belonging to the rhinocryptidae. this family is characteristic of the temperate forests of south america, an it is in a protected forest area. the evaluation was made using the method proposed by reca et al. (1994), which use the sumin index consisting of 12 variables. the results indicate that eugralla paradoxa (ochre-flanked tapaculo) presents maximum priority (pm) to be preserved, scelorchilus rubecula (chucao tapaculo) deserves special attention (ae) of conservation, while pteroptochos tarnii (black throated huet huet) and scytalopus magellanicus (andean tapaculo) species would not preserve priority (np). after this, it is necessary to implement a specific protective measurements for this family, given that its habitat shows signs of antropogenic processes, which may translate into a declining of their populations.
Cytogenetics of Chilean angiosperms: Advances and prospects
JARA-SEGUEL,PEDRO; URRUTIA,JONATHAN;
Revista chilena de historia natural , 2012, DOI: 10.4067/S0716-078X2012000100001
Abstract: cytogenetic data on chilean angiosperms have been reported since at least eight decades ago; however, much of this information is disperse in diverse sources and is not readily available as a comprehensive document that allows having a general vision on advances and gaps in this matter. the goal of this paper is to summarize the advances and prospets on cytogenetic studies of the chilean angiosperms based on compiled publications from 1929 to 2010. we found 78 publications supplied by four groups of chilean researchers and some foreign specialists. cytogenetic data have been reported for 139 chilean angiosperm species (2.8 % of the total), which belong to 58 genera and 34 families. during 2001-2010 there was an increase in the number of publications, being available 40 reports including 95 additional species. based on these data, we hope that such a trend can be maintained in the next decade if the current research groups and young specialists continue to be interested in the study of native plants.
Cytogenetics of Chilean angiosperms: Advances and prospects Citogenética de angiospermas chilenas: Avances y proyecciones
PEDRO JARA-SEGUEL,JONATHAN URRUTIA
Revista chilena de historia natural , 2012,
Abstract: Cytogenetic data on Chilean angiosperms have been reported since at least eight decades ago; however, much of this information is disperse in diverse sources and is not readily available as a comprehensive document that allows having a general vision on advances and gaps in this matter. The goal of this paper is to summarize the advances and prospets on cytogenetic studies of the Chilean angiosperms based on compiled publications from 1929 to 2010. We found 78 publications supplied by four groups of Chilean researchers and some foreign specialists. Cytogenetic data have been reported for 139 Chilean angiosperm species (2.8 % of the total), which belong to 58 genera and 34 families. During 2001-2010 there was an increase in the number of publications, being available 40 reports including 95 additional species. Based on these data, we hope that such a trend can be maintained in the next decade if the current research groups and young specialists continue to be interested in the study of native plants. Los datos citogenéticos sobre angiospermas chilenas han sido reportados desde al menos ocho décadas atrás; sin embargo, mucha de esta información está dispersa en diversas fuentes y no está disponible como un documento completo que permita tener una visión general sobre los avances y vacíos en esta materia. El objetivo de este trabajo es resumir los avances y proyecciones sobre los estudios citogenéticos disponibles para angiospermas chilenas, basado en publicaciones recopiladas desde 1929 hasta el 2010. Nosotros encontramos 78 publicaciones aportadas por cuatro grupos de investigadores chilenos y por algunos especialistas extranjeros. Datos citogenéticos han sido reportados para 139 especies de angiospermas chilenas (2.8 % del total), las cuales pertenecen a 58 géneros y 34 familias. Durante los a os 2001-2010, existió un incremento en el número de publicaciones estando disponibles 40 reportes que incluyen 95 especies adicionales. Basados en estos datos, esperamos que esta tendencia pueda ser mantenida en la siguiente década si los actuales grupos de investigación y especialistas jóvenes siguen interesados en estudiar plantas nativas.
EVALUACIóN DEL ESTADO DE CONSERVACIóN DE CUATRO ESPECIES DE AVES DE LA FAMILIA RHINOCRYPTIDAE EN UN áREA SILVESTRE PROTEGIDA EN EL SUR DE CHILE
Yenny SOTO-MORA,Jonathan URRUTIA
Acta zoológica mexicana , 2010,
Abstract: La riqueza de avifauna endémica de Chile está siendo amenazada por procesos de destrucción de sus hábitats naturales. Debido a ello se evalúa el estado de conservación de cuatro especies pertenecientes a la Familia Rhinocryptidae, característica de los bosques templados de Sudamérica, presentes en un área silvestre protegida. Para ello se utilizó el Método propuesto por Reca et al. (1994), quienes emplean el índice SUMIN, compuesto por valores de 12 variables. Los resultados obtenidos se alan que Eugralla paradoxa (churrín de la Mocha) presenta Prioridad Máxima (PM) de ser conservada, Scelorchilus rubecula (chucao) merece una Atención Especial (AE) de conservación, en cambio Pteroptochos tarnii (hued hued del sur) y Scytalopus magellanicus (churrín del sur) serían especies No Prioritarias de conservar (NP). De la aplicación de este método, se deduce que es necesario implementar medidas de protección concretas para esta familia, ya que su hábitat presenta indicios de intervención antrópica, lo que se puede traducir en una disminución de sus poblaciones.
Estado del conocimiento y principales amenazas de los humedales boscosos de agua dulce de Chile
CORREA-ARANEDA,FRANCISCO; URRUTIA,JONATHAN; FIGUEROA,RICARDO;
Revista chilena de historia natural , 2011, DOI: 10.4067/S0716-078X2011000300002
Abstract: forested freshwater wetlands are naturally flooded or saturated areas with hydrophilic forest vegetation which is worldwide distributed and is known as "pitrantos, hualves o hualhues" in chile. this paper gives to know the state of art of these wetlands in chile, through a description of its biological, physical-chemical and hydro-dynamic characteristics, identifying the main threats to its conservation and the main research needs. these environments can be permanently or temporarily flooded, depending on microclimatic, biological and edaphical processes. its vegetation is dominated by species of the family myrtaceae. both hydric behavior and vegetation structure are major aspects that directly determine the water physical-chemical characteristics and the distribution patterns of biological communities. chile's forested wetlands have been studied broadly from a vegetation and floristic point of view, but basic studies on limnology, hydrology or fauna are lacking, which results on a total lack of knowledge about its functioning at the ecosystem level and the effects that human activities on basins (e.g., agricultural, stockbreeding, forest) could have on its hydric and biological components. in spite of being ecosystems of great cultural and ecological significance, important weakness can be identified on its state of conservation, as they are not protected by conservation tools that exist in chile nowadays. therefore, forested wetlands emerge as unique ecosystems of global importance, nearly unknown in chile and of great interest on developing an important number of research lines, even though their high susceptibility facing anthropic disturbances threaten their continuance.
Estado del conocimiento y principales amenazas de los humedales boscosos de agua dulce de Chile Knowledge status and principal threats to freshwater forested wetlands of Chile
FRANCISCO CORREA-ARANEDA,JONATHAN URRUTIA,RICARDO FIGUEROA
Revista chilena de historia natural , 2011,
Abstract: Los humedales boscosos de agua dulce son áreas naturalmente inundadas o saturadas, que sustentan vegetación boscosa hidrófila, están presentes en todo el mundo, y en Chile son conocidos como "pitrantos, hualves o hualhues". El presente estudio entrega el estado del conocimiento de estos humedales en Chile, mediante una descripción de sus características biológicas, fisicoquímicas e hidrodinámicas, identificando las principales amenazas para su conservación y las principales necesidades de investigación. Estos ambientes pueden presentar inundación permanente o temporal, dependiendo de un conjunto de procesos microclimáticos, biológicos y edafológicos. Su vegetación, del tipo hidrófila boscosa, es dominada por especies de la familia Myrtaceae. Tanto el comportamiento hídrico como la estructura vegetacional destacan dentro de los aspectos que determinan directamente las características fisicoquímicas del agua y los patrones de distribución de las comunidades biológicas. Los humedales boscosos de Chile han sido ampliamente estudiados desde un punto de vista vegetacional y florístico, pero carecen de estudios limnológicos, hidrológicos o faunísticos básicos, de lo cual deriva un total desconocimiento en relación a su funcionamiento a nivel ecosistémico y los efectos que pueden tener las actividades humanas en sus cuencas (e.g., agrícola, ganadera, forestal) sobre sus componentes hídricos y biológicos. A pesar de ser ecosistemas de gran relevancia cultural y ecológica, se identifican importantes falencias en cuanto a su estado de conservación, al no encontrarse protegidos por las actuales herramientas de conservación existentes en el país. Por lo tanto, emergen como ecosistemas únicos, de relevancia mundial, prácticamente desconocidos en Chile y de gran interés para el desarrollo de numerosas líneas de investigación, aunque su alta susceptibilidad ante perturbaciones de origen antrópico amenaza su permanencia en el tiempo. Forested freshwater wetlands are naturally flooded or saturated areas with hydrophilic forest vegetation which is worldwide distributed and is known as "pitrantos, hualves o hualhues" in Chile. This paper gives to know the state of art of these wetlands in Chile, through a description of its biological, physical-chemical and hydro-dynamic characteristics, identifying the main threats to its conservation and the main research needs. These environments can be permanently or temporarily flooded, depending on microclimatic, biological and edaphical processes. Its vegetation is dominated by species of the family Myrtaceae. Both hydric behavior an
KRAB-containing zinc-finger repressor proteins
Raul Urrutia
Genome Biology , 2003, DOI: 10.1186/gb-2003-4-10-231
Abstract: Zinc-finger proteins containing the Krüppel-associated box (KRAB-containing proteins) were discovered in 1991 by Bellefroid et al. [1]. They make up approximately one third (290) of the 799 different zinc-finger proteins present in the human genome, and as a result, this group of proteins is the largest single family of transcriptional regulators in mammals. Many genes encoding KRAB-containing proteins are arranged in clusters, but others occur individually throughout the genome. The best characterized cluster is on 19q, containing 148 genes (51% of the family) within a region close to 19q13 [2]; other clusters are in centromeric and telomeric regions of other chromosomes. In particular, members of the family containing SCAN domains (see below) are clustered on 3p21-22, 6p21-22, 16p13.3, and 17p12-13. Non-clustered genes encoding KRAB-containing proteins are scattered over the other chromosomes, with about half on autosomes and half on sex chromosomes. Although the expression of genes of other clustered families, such as homeobox genes, is coregulated, it remains to be determined whether a comparable mechanism operates for genes encoding KRAB-containing proteins, and more studies are needed to show how chromosome organization influences the expression patterns of this family.As shown in Figure 1, KRAB-containing proteins are characterized by the presence of a DNA-binding domain made up of between 4 and over 30 zinc-finger motifs and a KRAB domain. The KRAB domain, located near the amino terminus of the protein, consists of one or both of the KRAB A box and the KRAB B box (see below). Other domains, such as the SCAN domain, are found in a small subset of members of the family [2,3] (Table 1). The two boxes of the KRAB domain are always encoded by individual exons separated by introns of variable sizes. This exon-intron composition allows the generation of different products by alternative splicing. In fact, zinc-finger proteins that contain only a KRAB A domain, for
Los eslabonamientos y la historia económica de Colombia
Urrutia,Miguel;
Desarrollo y Sociedad , 2008,
Abstract: the paper analyzes albert hirschman′s theory of linkages in economic development in his writings, and the possible influence of his colombia experience in the development of this idea. the theory is then applied to explain colombia's economic history in the nineteenth and twentieth century.
Hacia una política en tránsito: Ficción en el cine chileno (2008-2010)
Urrutia,Carolina;
Aisthesis , 2010, DOI: 10.4067/S0718-71812010000100003
Abstract: cinema is political in the sense that film camera never takes a neutral position and it always manages to establish a dialog with its social and cultural environment. in fact, although chilean contemporary fiction dissociates itself from any explicit ideological discourse due to its primary focus on intimacy and everyday life, its alienated representation of life turns into a purely political feeling of unease and uncertainty.
Script, un modelo cognitivo del lenguaje.: Estudio experimental a partir de tres grupos etáreos
Urrutia,Mabel;
Revista signos , 2004, DOI: 10.4067/S0718-09342004005500005
Abstract: this article gives account of an experimental research that consists of outlining the structure and functioning of possible forms of organization of human knowledge, from a script of a visit to the doctor's. the corpus consists of oral reports transcribed that give an account of the experiences of the subjects of study when visiting the doctor's. the subjects are divided in three age groups: 10 young people, 10 adults and 10 elder people of michaihue, an area in san pedro de la paz, in concepcion. the results obtained contribute to the information about the way in which these scripts are stored in the human memory, the different linguistics tendencies among the number of events and peripheral ways, according to their age; and the way in which these mental constructs, scripts, leave an imprint in future actions of human experience, as it has been observed in this experience with users of chilean public health service.
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