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Search Results: 1 - 10 of 6372 matches for " XAVIER; SARMIENTO "
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FENOLOGíA FLORAL Y VISITANTES FLORALES EN Drimys granadensis L.f. (WINTERACEAE)
MARQUINEZ,XAVIER; SARMIENTO,RODRIGO; LARA,KATHERINE;
Acta Biológica Colombiana , 2009,
Abstract: the purpose of this research was to characterize the flowering phenological phases and to determine the flower visitors in a natural population of drimys granadensis (common name: canelo; winteraceae) in altos de yerbabuena, eastern mountains of sabana de bogotá ( colombia ). floral phenology development lasted 9.5 days when flowering occurred under sunny conditions, 12.5 days under rainy conditions and 16 days when flower visitors were excluded using cloth bags. it was done observations related with the resources used, the phenological phases of visited flowers and the pollen load on the flower visitors. visitors corresponded with 29 morphospecies, 6 orders y 21 families of insects. four species of coleoptera and two species of diptera were considered as possible pollinators taking in account abundance and pollen load. the results are analyzed in relation with those reported for other species in the genus drimys and in the family winteraceae.
Ara?as asociadas a la floración de Drimys granadensis (Winteraceae)
MARQUíNEZ,XAVIER; JULIANA,CEPEDA; LARA,KATHERINE; SARMIENTO,RODRIGO;
Revista Colombiana de Entomología , 2010,
Abstract: drimys granadensis (winteraceae) is a common tree in the high-andean forests, with a system of open pollinatión by insects. in this work we identified the spiders associated with d. granadensis in relatión to the floral phenological phases and the visiting insects. we found a total of 53 mature spiders from seven families (araneidae, thetragnathidae, theridiidae, linyphiidae, thomisidae, salticidae and aniphaenidae) and 12 morphospecies. the spiders had a preference for flowers in the female and hermaphrodite phases where the dipterans were more abundant. we found a species of thwaitesia (theridiidae) foraging exudates of the stigmata. this species has an abdomen with coloratión similar to the anthers and a transparent body that helps them be imperceptible in the flowers. the camouflage is also used to hunt by a species of misumena (thomisidae), which is similar in color and form to a d. granadensis flower bud.
FENOLOGíA FLORAL Y VISITANTES FLORALES EN Drimys granadensis (WINTERACEAE)
Marquínez-Casas Xavier,Sarmiento Rodrigo,Lara Katherine
Acta Biológica Colombiana , 2009,
Abstract: El propósito de este trabajo fue caracterizar las fases fenológicas florales y determinar los visitantes florales en una población natural de Drimys granadensis (Winteraceae) ubicada en Altos de Yerbabuena (2850 m), cerros orientales de la Sabana de Bogotá, (Colombia). El desarrollo fenológico floral duró 9.5 días cuando la floración ocurrió en época soleada, 12.5 días en época lluviosa y 16 días cuando se excluyeron a los visitantes florales mediante embolsado. Se realizaron observaciones del recurso utilizado, fase fenólogica de la flor visitada y cargas polínicas en los visitante florales, los cuales correspondieron a 6 órdenes, 21 familias y 29 morfoespecies de insectos. Cuatro especies de coleópteros y dos de dípteros fueron considerados posibles polinizadores por su abundancia y carga de polen. Los resultados obtenidos se discuten en relación con aquellos reportados en otras especies del género Drimys y de la familia Winteraceae.
Ara as asociadas a la floración de Drimys granadensis (Winteraceae) Spiders associated with the flowering of Drimys granadensis (Winteraceae)
XAVIER MARQUíNEZ,CEPEDA JULIANA,KATHERINE LARA,RODRIGO SARMIENTO
Revista Colombiana de Entomología , 2010,
Abstract: Drimys granadensis (Winteraceae) es un árbol frecuente en los bosques altoandinos, con un sistema de polinización entomófilo abierto. En este trabajo se identificaron las ara as asociadas a D. granadensis en relación con las fases fenológicas florales y con los insectos visitantes. Encontramos un total de 53 adultos de ara as de siete familias (Araneidae, Thetragnathidae, Theridiidae, Linyphiidae, Thomisidae, Salticidae y Aniphaenidae) y 12 morfoespecies. Las ara as tuvieron preferencia por flores en fase femenina y hermafrodita donde los dípteros fueron más abundantes. Se encontró una especie de Thwaitesia (Theridiidae) forrajeando exudados de los estigmas. Esta especie presenta abdomen con coloración similar a las anteras y un cuerpo transparente que le ayuda a pasar desapercibida dentro de las flores. El camuflaje es también usado para cazar por una especie de Misumena (Thomisidae) que se asemeja en color y forma a un botón floral de D. granadensis. Drimys granadensis (Winteraceae) is a common tree in the high-Andean forests, with a system of open pollinatión by insects. In this work we identified the spiders associated with D. granadensis in relatión to the floral phenological phases and the visiting insects. We found a total of 53 mature spiders from seven families (Araneidae, Thetragnathidae, Theridiidae, Linyphiidae, Thomisidae, Salticidae and Aniphaenidae) and 12 morphospecies. The spiders had a preference for flowers in the female and hermaphrodite phases where the dipterans were more abundant. We found a species of Thwaitesia (Theridiidae) foraging exudates of the stigmata. This species has an abdomen with coloratión similar to the anthers and a transparent body that helps them be imperceptible in the flowers. The camouflage is also used to hunt by a species of Misumena (Thomisidae), which is similar in color and form to a D. granadensis flower bud.
Membrane and Subcellular Muscle Injury Are Induced by Single or Multiple Exposure to Cigarette Smoke  [PDF]
Ana Maria Fleig-Mayer, Alba Ramirez-Sarmiento, Amanda Iglesias, Montserrat Morlá, Carlos Coronell, Diego Rodríguez, Simona Pichinni, Josep Lloreta, Piergiorgio Zuccaro, Xavier Busquets, Joaquim Gea, Jose R. Jardim, Mauricio Orozco-Levi
Open Journal of Pathology (OJPathology) , 2014, DOI: 10.4236/ojpathology.2014.43019
Abstract:

Cigarette smoking is the main cause of chronic obstructive pulmonary disease (COPD). Diaphragm injury is observed in patients with COPD. However, the potential role of smoking in triggering or perpetuating muscle injury is unknown. The present study was aimed at evaluating the potential role of commercial tobacco smoke as a direct cause of skeletal muscle injury in experimental conditions. Seventy Wistar rats (170 - 250 g) were assigned to smoking (n = 49) or non-smoking (n = 21) groups. The smoking groups were submitted to a single or multiple (i.e., five or thirty) daily sessions of cigarette smoking in an inhalatory chamber (time length: 2 h each session). The level of exposure was constant and assessed by CO concentrations (50 ppm) and serum cotinine analysis. Animals submitted to a single smoke exposure and the corresponding controls were euthanized in groups at 0 h, 2 h, 4 h, 24 h or 48 h after completing the exposure. Animals submitted to multiple exposures were euthanized at 0 h after smoking. Samples from vastus lateralis muscle were obtained and processed for assessing cell injury and selected protein expression. Monoclonal anti-albumin antibodies were used to identify muscle fibers with sarcolemmal (membrane) injury. Subcellular muscle injury was assessed using transmission electron microscopy (EM). MyoD, myogenin and α-tubulin were immunodetected using western blot techniques. Exposure to cigarette smoke associated with significant membrane damage (mean relative difference (MRD) with controls: +181%, p = 0.004) and sarcomere disruptions (MRD: +226%, p = 0.001). Expression of MyoD and myogenin (normalized to α-tubulin) were significantly increased at 4 h and remained increased at 48 h post-exposure. We conclude that not only a single but also consecutive exposure to tobacco smoke have acute deleterious effects on peripheral muscle structure. A rapid induction of subrogate markers of skeletal muscle stress and repair processes associates to sarcolemmal and

Apuntes sobre la ense?anza-aprendizaje de la radiología oral
Sarmiento Sarmiento,Pedro Rafael;
Revista Facultad de Odontología Universidad de Antioquia , 2010,
Abstract: the remarkable impact that oral radiology has had on the clinical diagnosis and the importance of its practice for professionals, theoreticians, empirics and instructors, as well as patients, is the central objective of this essay. the objective was to establish a pedagogic and academic framework over which it will be evident that the teaching of radiology is also a matter of learning opportunity (apprenticeship). a realistic point of view is offered, based on reflections and experiences arisen from the teaching and learning of oral radiology over several years. finally as a proposal, the author suggests assuming the teaching of radiology as a complex practice in which theoretical, empirical and practical factors are complemented.
Apuntes sobre la ense anza-aprendizaje de la radiología oral Notes on the teaching-learning process of oral radiology
Pedro Rafael Sarmiento Sarmiento
Revista Facultad de Odontología Universidad de Antioquia , 2010,
Abstract: El innegable impacto que la radiología oral ha tenido sobre los diagnósticos clínicos y la incidencia de su práctica para profesionales, teóricos, instructores y empíricos; lo mismo que para los pacientes constituyen el centro de este ensayo. El objetivo fue establecer un marco pedagógico y académico sobre el cual se evidenciara que ense ar radiología es también una cuestión y una oportunidad de aprendizaje. Se ofrece una mirada vivencial fundamentada en las experiencias y reflexiones surgidas en la ense anza y aprendizaje de la radiología oral durante varios a os. Finalmente se propone la ense anza de la radiología como una disciplina que implica comprender una compleja práctica en la que se insertan y complementan saberes teóricos, prácticos y empíricos. The remarkable impact that oral radiology has had on the clinical diagnosis and the importance of its practice for professionals, theoreticians, empirics and instructors, as well as patients, is the central objective of this essay. The objective was to establish a pedagogic and academic framework over which it will be evident that the teaching of radiology is also a matter of learning opportunity (apprenticeship). A realistic point of view is offered, based on reflections and experiences arisen from the teaching and learning of oral radiology over several years. Finally as a proposal, the author suggests assuming the teaching of radiology as a complex practice in which theoretical, empirical and practical factors are complemented.
?Bondad o estrategia?: tejiendo responsabilidad social en el mundo del carbón
Sarmiento,Nataly;
Colombia Internacional , 2008,
Abstract: this article questions the motivations of multinational corporations in adopting social responsibility policies in developing countries. to this end, the article compares the case of drummond ltd. and carbones del cerrejón ltd. in colombia . the study demonstrated that the companies respond in different ways to the institutional restrictions and pressures and that therefore their initiatives in social responsibility rise amidst specific institutional contexts. it concludes that the motivations that both multinationals have to adopt social responsibility policies are divided in two categories: internal and external. as a result, the main contribution of this article to the literature in this field was the development of a bidimensional model of social responsibility in which the institutional factors constitute the basis of behavior of multinational corporations.
Más allá de la Selección Natural
Sarmiento Carlos
Acta Biológica Colombiana , 2009,
Abstract: RESUMEN La explicación de la evolución de los organismos a través de selección natural es el núcleo del sistema conceptual de la biología gracias a su sencillez, a su poder explicativo así como a su coherencia con una cantidad impresionante de datos. No obstante, en algunos casos se ha transformado en un discurso por defecto que no permite penetrar y descubrir procesos mucho más complejos. Esta dificultad ha sido puntualizada por varios autores y el presente documento hace una síntesis de alternativas o delimitaciones al modelo de evolución por selección natural en varios niveles: Se exploran las consecuencias del neutralismo genético. Se revisa como la complejidad de la relación genotipo y fenotipo puede dificultar la aplicación de un modelo genético simple de evolución por selección natural. Se discute la propuesta de extender la idea de neutralidad a los fenotipos mediante el modelo de equivalencia funcional. Se detallan algunos de los aspectos controversiales en la aplicación del concepto de adaptación y se discute como incluir la historia filogenética de los caracteres propuestos como adaptativos, puede enriquecer la explicación de los mismos. Se revisan las consecuencias de estos análisis en cuatro niveles: la adaptación, la definición de especie, la reconstrucción filogenética y la conservación. Este documento en ningún momento niega el valor del modelo de evolución por selección natural, pero si puntualiza la importancia de modelos distintos fuertemente afianzados en datos concretos rigurosamente analizados. Palabras clave: Neutralismo. Equivalencia funcional. Adaptación. SUMMARY The explanatio
Andes mountains and human dimensions of global change, an overview
Sarmiento, F.
Pirineos : Revista de Ecología de Monta?a , 2008,
Abstract: No disponible
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