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Search Results: 1 - 10 of 33404 matches for " Benavides-Martínez "
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EFECTO DEL GRADIENTE ALTITUDINAL SOBRE ASPECTOS AUTOECOLóGICOS DE ESPELETIA PYCNOPHYLLA ssp. ANGELENSIS CUATREC. (ASTERACEAE) EN EL PáRAMO EL INFIERNILLO (NARI?O-COLOMBIA)
Benavides-Martínez,Iván F.; Burbano-Martínez,Diana L.; Urbano-Apráez,Sandra M.; Solarte-Cruz,María E.;
Actualidades Biológicas , 2007,
Abstract: some autoecological features of espeletia pycnophylla ssp. angelensis cuatrec. such as its demographic structure, population density, spatial pattern of dispersion, production of reproductive structures, adult morphometry and survivorship, were studied in an altitudinal gradient on a dry paramo of nari?o (colombia). hypothesis proposed by other authors about a linear effect caused by the elevation on these variables were completely rejected. the elevation induces an ecoclinal effect on population density, and this density correlates negatively with both production of reproductive structures and adult sizes. these results elucidate an unequivocal effect of density-dependence phenomena on population fitness. the intermediate zone of the altitudinal gradient exhibits a high population density, but on the other hand show reduced corporal adult sizes, minimal production of reproductive structures and the probability of juveniles reaching advanced ages is low. evidently, this intermediate elevation can have favorable ecological conditions for the seedling establishment, wich increments population densities at long term. we propose that other author's generalizations about the influence of elevation on the autoecology of these plants are limited, because the particular life and disturbance stories of paramos and the spatial, ecological and genetic isolating are explicative factors impossible to take away from the context. the demographic structure of the population fitted the logarithmic model, revealing its early regeneration state from the last fire event on 2003 and the similarity of the survivorship curves among every elevation, probed a high demographic stability.
EFECTO DEL GRADIENTE ALTITUDINAL SOBRE ASPECTOS AUTOECOLóGICOS DE ESPELETIA PYCNOPHYLLA ssp. ANGELENSIS CUATREC. (ASTERACEAE) EN EL PáRAMO EL INFIERNILLO (NARI O-COLOMBIA) THE EFFECT OF THE ALTITUDINAL GRADIENT ON AUTOECOLOGICAL FEATURES OF ESPELETIA PYCNOPHYLLA ssp. ANGELENSIS CUATREC. (ASTERACEAE) IN THE PARAMO 'EL INFIERNILLO' (NARI O-COLOMBIA)
Iván F. Benavides-Martínez,Diana L. Burbano-Martínez,Sandra M. Urbano-Apráez,María E. Solarte-Cruz
Actualidades Biológicas , 2007,
Abstract: Se estudió el efecto de la elevación sobre algunos aspectos autoecológicos de la especie Espeletia pycnophylla ssp. angelensis Cuatrec. (Asteraceae), tales como su estructura demográfica, densidad poblacional, patrón de distribución espacial, producción de estructuras reproductivas, morfometría de adultos y supervivencia, en un páramo seco del departamento de Nari o (Colombia). Las hipótesis propuestas por otros autores acerca del efecto lineal que la elevación produce sobre estas variables, fueron completamente rechazadas. La elevación induce un efecto coenoclínico sobre la densidad poblacional y ésta a su vez, se correlaciona negativamente con la producción de estructuras reproductivas y el tama o de los adultos, evidenciándose un efecto inequívoco del fenómeno de la densodependencia sobre el potencial biótico de la población. En la zona intermedia del gradiente, la densidad poblacional es máxima, pero los tama os corporales son reducidos, la producción de estructuras reproductivas es mínima y la probabilidad de que un juvenil alcance edades avanzadas es baja. Evidentemente, esta elevación intermedia estaría presentando condiciones ecológicas favorables para el establecimiento y supervivencia de plántulas, lo que a largo plazo conlleva a un aumento de la densidad poblacional. Se propone que las generalizaciones de otros autores acerca de la influencia de la elevación sobre la autoecología de estas plantas son inverosímiles y limitadas, ya que la historia particular de vida y disturbio del páramo y los aislamientos espaciales, ecológicos y genéticos, son factores explicativos que no pueden aislarse del contexto. Paralelamente, la población se ajustó al modelo demográfico logarítmico, revelando su temprano estado de regeneración frente a la última quema ocurrida en el 2003, y la similitud de las curvas de supervivencia entre todas las elevaciones, probó una alta estabilidad demográfica. Some autoecological features of Espeletia pycnophylla ssp. angelensis Cuatrec. such as its demographic structure, population density, spatial pattern of dispersion, production of reproductive structures, adult morphometry and survivorship, were studied in an altitudinal gradient on a dry paramo of Nari o (Colombia). Hypothesis proposed by other authors about a linear effect caused by the elevation on these variables were completely rejected. The elevation induces an ecoclinal effect on population density, and this density correlates negatively with both production of reproductive structures and adult sizes. These results elucidate an unequivocal effect of density-dependen
Pompilidae (Hymenoptera) de algunos municipios del centro y sur de Tamaulipas, México
HORTA-VEGA, Jorge Víctor;GARCíA-GUTIéRREZ, Mauricio Emanuel;BENAVIDES-MARTíNEZ, Martha Isabel;CORREA-SANDOVAL, Alfonso;
Acta zoológica mexicana , 2009,
Abstract: one hundred and two species and thirty two genera of the four subfamilies of pompilidae wasps, collected at localities of eight municipalities of tamaulipas, méxico were recorded. twenty one species of these are new records for the country meanwhile 88 species are new records for the state of tamaulipas. the most abundant species were aporus notabilis notabilis y episyron conterminus posterus. thirty three species are neotropical. the results suggest that others species will be present in this region of the country and therefore more studies must be necesary to make in order to know the richness of this group of wasps.
EL PRINCIPIO DE INEXCUSABILIDAD Y EL DERECHO DE ACCIóN DESDE LA PERSPECTIVA DEL ESTADO CONSTITUCIONAL
Martínez Benavides,Patricio;
Revista chilena de derecho , 2012, DOI: 10.4067/S0718-34372012000100006
Abstract: we intend to make a reflection on the constitutional principle of inexcusability from a civil procedural standpoint, as an organic correlate and counter face to the right to be heard in its current understanding as fundamental right to the effective judicial protection. for this, we will make a brief account of its scope, and then we will propose an extension of its meaning in the light of the constitutional state paradigm.
EL PRINCIPIO DE INEXCUSABILIDAD Y EL DERECHO DE ACCIóN DESDE LA PERSPECTIVA DEL ESTADO CONSTITUCIONAL THE PRINCIPLE OF INEXCUSABILITY AND THE RULE OF ACTION FROM THE CONSTITUTIONAL POINT OF VIEW
Patricio Martínez Benavides
Revista Chilena de Derecho : Publicado por la Facultad de Derecho Universidad Católica de Chile , 2012,
Abstract: RESUMEN: Se pretende realizar una reflexión acerca del principio constitucional de la inexcusabilidad desde un punto de vista procesal civil, en cuanto correlato orgánico y contracara del derecho de acción, en su actual comprensión como derecho fundamental a la tutela jurisdiccional efectiva. Para ello, se realizará una breve noticia de su alcance, para luego plantear una ampliación de su comprensión a la luz del paradigma del Estado Constitucional. We intend to make a reflection on the constitutional principle of inexcusability from a civil procedural standpoint, as an organic correlate and counter face to the right to be heard in its current understanding as fundamental right to the effective judicial protection. For this, we will make a brief account of its scope, and then we will propose an extension of its meaning in the light of the constitutional state paradigm.
Efectos de las exportaciones en el crecimiento económico de México: Un análisis de cointegración, 1929-2009
Rodríguez Benavides, Domingo;Venegas-Martínez, Francisco;
EconoQuantum , 2011,
Abstract: the aim of this paper is to examine the hypothesis "export led growth" for the mexican case, during the period 1929-2009, which states that the expansion of exports may positively affect economic growth. this is accomplished through econometric techniques of multivariate time series, specifically by using johansen cointegration test and granger causality analysis. through the estimation of an error correction model, a stable long-term relationship between exports and real gdp in mexico is found, and the direction of causality runs from exports to gdp growth.
La restricción externa al crecimiento en México: 1988-2009
Rodríguez Benavides, Domingo;Venegas-Martínez, Francisco;
Contaduría y administración , 2012,
Abstract: this article shows empirical evidence about thirwall' (1979) model on the balance of payments constraint to growth for mexico. thirwall states that the relevant variables in the explanation of economic growth are the income elasticities of exports and imports and the income from the rest of the world. the latter variable is approximated, in this work, by the world gdp. the obtained results, by analyzing the period 1929-2003, suggest only the existence of a long-term relationship between mexico's gdp and global gdp over the period 1988-2009. the direction of causality between global and mexico's gdp, as expected, goes from the first to the last according to the dynamics of the estimated error correction model. no evidence was found that both variables were related in a longer period, which can be attributed to the fact that the mexican economy was essentially closed up until the eighties. this differs from other studies in which the us gdp is used as a proxy of the world gdp.
Los profesores universitarios: entre la exigencia profesional y el compromiso ético-social
Chávez González, Guadalupe;Benavides Martínez, Benigno;
Sinéctica , 2011,
Abstract: this work derives from the research on ''university teaching against change: a professional requirement and an ethical commitment''. the purpose of this research is to establish an objective-subjective relation between the numerous tasks and activities carried out by teachers within the university as part of their academic role and according to educational change processes. it also takes into consideration the ethical-social commitments that the teaching profession assumes while trying to fulfill its goals. it includes the current analysis and thoughts on the subject based on reviewed institutional documents, texts, comments, and especially, from ideas of university teachers interviewed for that purpose during 2009 and 2010. this research also intends to demonstrate the tension and contradictions of the forced relationship between the demands of the academic profession and the ethical commitments derived from it and from institutional standards. it interlinks with the developments that the authors have carried out in the universidad autonoma de nuevo leon interinstitutional project: professional ethics in graduate studies (coordinated by anita hirsch adler, professor-researcher from the universidad nacional autonoma de mexico) from 2006 to 2010. this project covers teacher’s ethics, a subject that is the center of this research.
La restricción externa al crecimiento en México: 1988-2009
Domingo Rodríguez Benavides,Francisco Venegas- Martínez
Contaduría y administración , 2012,
Abstract: Este artículo muestra evidencia empírica acerca del modelo de Thirwall (1979) sobre la restricción de balanza de pagos al crecimiento para México. Thirwall establece que las variables relevantes en la explicación del crecimiento económico son las elasticidades ingreso de las exportaciones e importaciones y el ingreso del resto del mundo. Esta última variable se aproxima, en este trabajo, por el PIB mundial. Los resultados obtenidos, al analizar el periodo 1929-2009, sugieren la existencia de una relación de largo plazo entre el PIB de México y el PIB mundial sólo durante el periodo 1988-2009. La dirección de la causalidad entre el PIB mundial y el de México, como era de esperarse, va del primero al segundo de acuerdo con la dinámica del modelo de corrección del error estimado. No se encontró evidencia de que ambas variables estuvieran relacionadas en un periodo más amplio, lo cual puede atribuirse a que la economía mexicana estaba prácticamente cerrada hasta antes de la década de los ochenta. Esto difiere de lo encontrado en otras investigaciones en donde se utiliza el PIB de Estados Unidos como proxy del PIB del resto del mundo.
Características clínicas y epidemiológicas de la colecistitis crónica xantogranulomatosa
LAIMEV,PATRICIA; MARTíNEZ M,CAROLINA; MARTíNEZ R,DANIELA; MARTíNEZ B,PAMELA; BENAVIDES C,CARLOS; MOLINA C,CARLA;
Revista chilena de cirugía , 2007, DOI: 10.4067/S0718-40262007000200007
Abstract: xanthogranulomatous cholecystitis (xgc) is a rare inflammatory disease of the gallbladder, variant of chronic cholecystitis. the aim of this study was to describe the epidemiology and clinical data of one series of patients with this diagnosis. of a total of 1486 cholecystectomies performed between 2004 and 2006, we found 48 cases of xgc (3.23% of total). the most of them were women (67.4%) with an average age of 53.5 years. the clinical history was similar to chronic cholecystitis with a variable duration of the symptoms, from 1 week to 10 years. 19% of the patients had antecedents of obstructive jaundice, although just one had dilatation of the choledocus at ultrasound. all the patients had cholelithiasis, the mayor reason for surgery. four of our cases had findings on ultrasound examination suggestive of carcinoma of gallbladder and at operation in eight patients the appearances of the gallbladder resembled carcinoma to the surgeons. in none of them the diagnosis was confirm and just in one patient was found association between xgc and gallbladder cancer, without previous suspicion. the diagnosis of xgc was never suspected. this is an uncommon entity with difficult diagnosis. the incidence in our study was higher than other reports. clinically is hard to distinguish from chronic cholecystitis, and is often confused with gall bladder carcinoma. as other authors support, both diagnosis can coexist, what occurred in 2.17% of the patients in our series. there was no significant difference in the frequency of gall bladder carcinoma between the patients with cxg and those with another type of chronic cholecystitis
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