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Search Results: 1 - 10 of 466005 matches for " A.; Velázquez "
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Naturaleza y cultura en América Latina: Dinámica demográfica, calidad de vida y riesgos ambientales. Naturaleza, bienestar y malestar en la argentina a principios del siglo XXI
Velázquez,Guillermo A.;
Poblaci?3n y sociedad , 2010,
Abstract: in this work we will study the relationship among environmental risks, demographic dynamics and grade of argentinean population's well-being. these dimensions are mediated by culture in the argentine territory. for environmental risks we will use flood problems, earthquake, tornadoes and land deterioration; for demographic dynamics we will use inter-census growth and migratory balances. and for measuring the grade of argentinean population's well-being we will use a specially made for index. we will use for that a gis, in which we will have, on first term, the digitization of the respective layers of environmental risks; in second term we will have the information on demographic dynamics and, finally, we will have a synthetic index of population's well-being. this synthetic index is built starting from a pondered combination of significant indicators of environmental and socioeconomic dimensions like education, health and housing. starting from an operation of overlapping of layers we will be able to size for each one of the environmental risks the demographic balance and the grade of well-being of argentinean population's different segments. this will allow us to size and to oppose the grades of well-being and the demographic dynamics according to the grade of affectation of each one of the considered physical-environmental events, allowing also establishing scenarios for the projection of these phenomena in the mark of the process of global environmental change.
Hábitat y condiciones de vida en la Argentina
Velázquez, Guillermo A.
Poblaci?3n y sociedad , 2007,
Abstract: This paper examines the habitat indicators -referred to the provision of public services as well as to the environment- collected in an ad hoc form in the 2001 Census. Starting from a special processing, it was possible to incorporate this information in a GIS in order to make a preliminary analysis and evaluation with the purpose of relating it with the living conditions of the Argentine population at regional level (511 spatial units in 2001). The level of inequity in the provision of services as well as in the quality of the environment is remarkable; in both cases this process is closely related to the process of social exclusion and the privatization of public services in Argentina during the 1990s.
Naturaleza y cultura en América Latina. Dinámica demográfica, calidad de vida y riesgos ambientales. Naturaleza, bienestar y malestar en la Argentina a principios del siglo XXI
Guillermo A. Velázquez
Poblaci?3n y sociedad , 2010,
Abstract: In this work we will study the relationship among environmental risks, demographic dynamics and grade of Argentinean population’s well-being. These dimensions are mediated by culture in the argentine territory. For environmental risks we will use fl ood problems, earthquake, tornadoes and land deterioration; for demographic dynamics we will use inter-census growth and migratory balances. And for measuring the grade of Argentinean population’s well-being we will use a specially made for index. We will use for that a GIS, in which we will have, on fi rst term, the digitization of the respective layers of environmental risks; in second term we will have the information on demographic dynamics and, fi nally, we will have a synthetic index of population’s well-being. This synthetic index is built starting from a pondered combination of signifi cant indicators of environmental and socioeconomic dimensions like education, health and housing. Starting from an operation of overlapping of layers we will be able to size for each one of the environmental risks the demographic balance and the grade of well-being of Argentinean population’s different segments. This will allow us to size and to oppose the grades of well-being and the demographic dynamics according to the grade of affectation of each one of the considered physical-environmental events, allowing also establishing scenarios for the projection of these phenomena in the mark of the process of global environmental change.
Las cianobacterias en ambientes polares
D. Velázquez,A. Quesada
Ecosistemas , 2011,
Abstract: El Phylum Cyanobacteria es uno de los taxones más antiguos de la historia de Tierra. Hay evidencias de que surgieron en el Arcaico y que su actividad biológica ha tenido consecuencias a nivel global. La amplia distribución de comunidades dominadas por cianobacterias en la Criosfera hace que constituyan una pieza clave en la reconstrucción de la vida microbiana durante las glaciaciones del Precámbrico. Son consideradas como los principales fotótrofos de la mayoría de los ecosistemas bentónicos polares de agua dulce donde convergen las condiciones adecuadas para que unos pocos organismos, tanto fototróficos como heterotróficos, se asienten formando comunidades con cierta capacidad auto-reguladora. El orden Oscilatoriales es el más representado en estos ecosistemas, probablemente por su amplia tolerancia térmica. Sin embargo, a pesar de no ser especialistas en condiciones de temperaturas cercanas a 0 oC, los niveles tan bajos de depredación que presentan y la flexibilidad y resistencia a condiciones inhóspitas las han promocionado como uno de los organismos más exitosos de la Criosfera.
Meiosis en mutantes desinápticos con restitución cromosómica en Rhoeo spathacea (Commelinaceae)
García-Velázquez,Armando;
Acta Agronómica , 2008,
Abstract: this study was carried out with collected material of rhoeo spathacea in the states of veracruz, chiapas, tabasco, yucatan, quintana roo and michoacan, mexico. all material exhibited a diploid chromosome number (2n =12) in mitosis. in meiosis, all individuals showedring and /or chains at metaphase i. exceptionally several desynaptic mutants resulted desynaptic - sdr (dissociation of paired chromosomes). therefore, in meiosis rhoeo did not exhibit synapsis in parallel-fashion instead the chromosomes are united in end-to-end (no chiasmata-) fashion. then, there are not bivalents, no chiasmata-achiasmata- as there are not four chromatids two of which resulted sister-chromatids. but in anaphase i, there is high regular 6:6 disyuction and observed as "rings or donuts". in which short arms are oriented to the center of those figures. from selfed a desynaptic- sdr (gava 1.1) mutant, a progeny of 123 individuals resulted: 90 diploid-ring forming, 1 acrotrisomic (2n=13) equally ring-forming reverts its "meiotic behavior", but 29 diplandrogynous tetraploids (2n=24) and 3 hypertetraploids (2n=25) resulted desynaptics. the cytological behaviour is due to the fact that rhoeo is a dikaryon: diploids-ring forming and the trisomic also and present subgenome a, but polyploids present subgenome b which includes a desynaptic gene in both sister chromatids as result of restitution at second division(2n).
La construcción de la imagen de México en Estados Unidos desde una perspectiva de riesgo
Velázquez García, Mario Alberto;
Frontera norte , 2008,
Abstract: this article analyzes how the image of mexico has been constructed in the united states based on the idea of risk, and the border's special role in this process. this analysis seeks to explore the way limits between societies prevent possible threats for a group. in this process the definition of otherness plays an important role. however, in this work we explore the way in which the other (mexico) has been defined and constructed from the united states' point of view. by way of an analytical example, we'll use movies filmed in north america using mexican or latin american images.
La construcción de un movimiento ambiental en México: El club de golf en Tepoztlán, Morelos
Velázquez García, Mario Alberto;
Región y sociedad , 2008,
Abstract: the article discusses how individuals define a social movement, in particular, how they build the elements that justify or explain their actions through interaction with other players or opponents. in order to do the analysis, the theory of social construction of reality is used to emphasize the interpretations that subjects have about certain events. the case study is the movement against the construction of a tourist attraction in tepoztlan, morelos.
Perspectivas del movimiento ambiental en la frontera entre México y Estados Unidos: acciones y necesidades
Velázquez García, Mario Alberto;
Región y sociedad , 2007,
Abstract: using political opportunity theory we will analyze the way in which american and mexican environmental groups use the contradictions between a value system and a set of social practices; the sudden mishaps; the illegitimacy or vulnerability of a government; and the availability of an innovative frame of action that allows them to convey their protests and vindications, in order to determine their possibilities and limitations.
La construcción de la imagen de México en Estados Unidos desde una perspectiva de riesgo
Mario Alberto Velázquez García
Frontera norte , 2008,
Abstract: En este artículo se analiza la manera en que se ha construido la imagen de México en Estados Unidos a partir de una idea de riesgo, y el papel que ha tenido la frontera en este proceso. Este análisis busca entender cómo los límites entre sociedades evitan las posibles amenazas para un grupo. En este proceso, la construcción de una otredad tiene un papel importante. A lo largo del trabajo veremos cómo se definió y construyó esta otredad de lo mexicano en Estados Unidos. Como ejemplo analítico utilizaremos las películas filmadas en Norteamérica que emplean imágenes de México o Latinoamérica.
Sobre las políticas y contenidos del bachillerato universitario
María de Lourdes Velázquez Albo
Perfiles educativos , 2004,
Abstract: A lo largo de la historia del bachillerato se han debatido aspectos como el sentido de este ámbito, los contenidos de los planes de estudio, métodos de ense anza, fundamentos teóricos, si los contenidos deben definirse como una continuidad de la educación básica, como prerrequisito del ciclo de estudios profesionales, o en su relación con el mercado de trabajo. Tras revisar atentamente documentos originales donde se plasman los argumentos sobre los cambios en los planes de estudio, es fácil percibir que aunque se hace énfasis en argumentos académicos, éstos obedecen a políticas dictadas por los gobiernos en turno en momentos coyunturales. Las políticas que se han llevado a cabo se agrupan en: impulso al laicismo; vinculación de la educación con el sector productivo; expansión de la capacidad de atención y, desde hace unos a os, se intenta una política vinculada con la globalización. En este trabajo se abordan las tres primeras.
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