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Search Results: 1 - 10 of 495297 matches for " María Elena Ramírez Agudelo "
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La necrosis, un mecanismo regulado de muerte celular
Ramírez Agudelo,María Elena; Rojas López,Mauricio;
Iatreia , 2010,
Abstract: three types of cellular death have been defined by morphological and biochemical criteria: apoptosis, necrosis and autophagy. apoptosis is a regulated cell death, mainly mediated by caspases; autophagy induces degradation of intracellular damaged organelles through the formation of vesicles that fuse with hydrolytic vacuoles. necrosis has been traditionally defined by the rupture the cytoplasmic membrane with subsequent release of intracellular material, triggering localized inflammatory intrinsic cellular activities and the events preceding cellular collapse are critical to determine the type of tissue damage. the fact that all three types of cellular death can coexist in any organ and tissue with different availabilities of atp, suggests that necrosis can be conceived as an active event and that to some extent it may be regulated. alterations in the structure of proteins and in the activity of different proteases, lipases and nucleases, indicate that each cell may have its own arsenal to trigger the events leading to necrosis. in this article we review some of the evidences on cellular regulation during necrosis.
Necrosis, a regulated mechanism of cell death La necrosis, un mecanismo regulado de muerte celular
Mauricio Rojas López,María Elena Ramírez Agudelo
Iatreia , 2010,
Abstract: Three types of cellular death have been defined by morphological and biochemical criteria: apoptosis, necrosis and autophagy. Apoptosis is a regulated cell death, mainly mediated by caspases; autophagy induces degradation of intracellular damaged organelles through the formation of vesicles that fuse with hydrolytic vacuoles. Necrosis has been traditionally defined by the rupture the cytoplasmic membrane with subsequent release of intracellular material, triggering localized inflammatory Intrinsic cellular activities and the events preceding cellular collapse are critical to determine the type of tissue damage. The fact that all three types of cellular death can coexist in any organ and tissue with different availabilities of ATP, suggests that necrosis can be conceived as an active event and that to some extent it may be regulated. Alterations in the structure of proteins and in the activity of different proteases, lipases and nucleases, indicate that each cell may have its own arsenal to trigger the events leading to necrosis. In this article we review some of the evidences on cellular regulation during necrosis. Con base en criterios morfológicos y bioquímicos se han definido tres clases de muerte celular: apoptosis, autofagia y necrosis. La primera es una muerte celular regulada, mediada principalmente por caspasas; en la autofagia ocurre formación de vesículas que se fusionan con vacuolas hidrolíticas para degradar organelas intracelulares alteradas. En cuanto a la necrosis, se la ha definido tradicionalmente por la ruptura de la membrana citoplasmática con salida del material intracelular lo que desencadena una reacción
Tendencias, rupturas, constantes y cambios: 20 a os de Comunicación y Sociedad
María Elena Hernández Ramírez
Comunicación y sociedad , 2007,
Abstract:
Rese a de "Pratiques novatrices en communication publique. Journalisme, relations publiques et publicité" de Marc-Fran ois Bernier, Fran ois Demers, Alain Lavigne, Charles Moumouni y Thierry Watine
María Elena Hernández Ramírez
Comunicación y sociedad , 2006,
Abstract:
Molecular characterization of Staphylococcus aureus from nosocomial sources by Multilocus Enzyme Electrophoresis (MLEE) Caracterización molecular de Staphylococcus aureus de origen nosocomial por Electroforesis de Enzimas Multilocus (MLEE)
Suárez Zulma,Valenzuela Emilia María,Mantilla José Ramón,Agudelo Carlos
Revista Colombiana de Biotecnología , 2002,
Abstract: Multilocus Enzyme Electrophoresis (MLEE) was used to characterise 41 Staphylococcus aureus isolates taken from Hospital San Juan de Dios (Bogotá) patients and personnel at the Intensive Care Unit (ICU), from September 1998 to September 1999. The genetic relationships between isolates, as well as resistance profile influence, biotype and compilation time/date, were established. The experimental evidence suggests that the population structure corre-sponds to the clonal model described for Staphylococcus aureus populations, reflecting the prevalence of a small number of clones during the collection period. Se caracterizaron 41 aislamientos se Staphylococcus aureus tomados a pacientes y personal de la unidad de cuidados intensivos (UCI) del Hospital San Juan de Dios, en el periodo comprendido entre septiembre de 1998 y septiembre de 1999 por medio del método de caracterización de Electroforesis de Enzimas Multilocus(MLEE). Se establecieron las relaciones genéticas entre los individuos, así como influencia del perfil de resistencia, el biotipo y el periodo de recolección. La evidencia experimental sugirió que la estructura de la población analizada encaja en el modelo clonal descrito previamente para las poblaciones de Staphylococcus aureus, coincidiendo con la prevalencia de un peque o número de clones durante el periodo de recolección.
Lipopolysaccharide (LPS) from E. coli has detrimental effects on the intestinal morphology of weaned pigs El lipopolisacárido (LPS) de E. coli deteriora los parámetros morfológicos intestinales de cerdos posdestete O lipopolissacarídeo (LPS) de E. coli afeta negativamente os parametros intestinais dos suínos apos desmame
Jaime Parra S,Jorge Agudelo T,Laura Ortiz,María C Ramírez
Revista Colombiana de Ciencias Pecuarias , 2011,
Abstract: Early weaning predisposes the pig intestine to structural and functional alterations, due to the increase in E. coli populations. These bacteria use the lipopolysaccharide (LPS) derived from their cell wall as an important pathogenic factor. Little is known about the effects of LPS on the intestinal morphology. Such knowledge could be helpful in understanding the pathogenesis of post-weaning enteritis, which is needed to design therapeutic strategies. Objective: this study aimed to evaluate the effects of the oral intake of LPSon the morphology of intestinal villi and glands of weaned pigs. Methods: the study used 52 pigs weaned at 21 days. The animals were fed a basal diet added with four levels of LPS (0.0, 0.3, 0.5 and 1.0 μg/mg of food) for 10 days. Pigs were sequentially slaughtered on days 1, 5, 7 and 10 after weaning, and samples of small intestine were taken to evaluate morphological parameters by computerized image analysis. The statistical design used was randomized blocks in a 4x4 factorial arrangement. Results: results showed that LPS decreases the height and area of intestinal villi, and increases the width of the villi and the depth and width of the intestinal glands. These effects probably contribute to a decreased intestinal nutrient absorption and increase co-infection with other pathogens, thus leading to the post-weaning diarrhea syndrome. Conclusions: this study stresses the usefulness of computerized morphometric analysis to evaluate the effect of LPS on intestinal morphology, so it may be used in future studies to investigate the pathophysiology of the causative agents of enteritis and to evaluate therapeutic strategies. El destete precoz de los cerdos predispone al desarrollo de alteraciones estructurales y funcionales en el intestino y a enteritis causadas por la bacteria Escherichia coli; la cual utiliza el LPS de su pared como uno de sus principales factores patogénicos. Debido a que se conoce poco sobre los efectos del LPS sobre los parámetros morfológicos intestinales, y a que ese conocimiento es necesario para comprender la patogenia de las enteritis postdestete y para dise ar estrategias terapéuticas. Objetivo: se realizó este estudio con el objetivo de evaluar el efecto de la administración de LPS de E. coli sobre la morfología de las vellosidades y las glándulas intestinales en cerdos recién destetados. Métodos: El estudio experimental se realizó con 52 cerdos destetados a los 21 días de edad. Los animales fueron alimentados con una dieta basal adicionada con cuatro niveles de LPS (0.0, 0.3, 0.5 y 1.0 μg/mg de alimento) du
HáBITOS ALIMENTICIOS, MORFOMETRíA Y ESTADOS GONADALES DE CINCO ESPECIES DE PECES EN DIFERENTES PERíODOS CLIMáTICOS EN EL RíO SOGAMOSO (SANTANDER)
Ramírez Caballero Angélica María,Pinilla Agudelo Gabriel Antonio
Acta Biológica Colombiana , 2012,
Abstract: El objetivo de esta investigación fue determinar algunos aspectos bioecológicos para cinco especies de peces del río Sogamoso, a fin de generar información de base que permita analizar los impactos generados por la construcción y operación de la represa de Hidrosogamoso. Para cada ejemplar colectado se registraron la longitud estándar, el peso total, se calculó la relación entre el peso y la longitud (P= aLb), se determinó el estado gonadal, el coeficiente de vacuidad, así como la importancia de cada categoría de alimento. El bocachico (Prochilodus magdalenae) alcanzó mayor abundancia en el río en la época seca y el inicio del desove se registró en diciembre. El coeficiente de vacuidad fue alto y su dieta se basó en materia orgánica. Los Pimelodus reportaron mayores capturas en diciembre; su dieta estuvo basada en insectos y peces. Los loricaridos Chaetostoma sp. y Sturisoma sp. solo se capturaron en los tramos medios y altos del río. Su dieta se basó en materia orgánica. Se requiere un estudio continúo más detallado para establecer el ciclo reproductivo de los Pimelodus y loricaridos. Dada la condición de especie amenazada y su dinámica migratoria, el bocachico es una de las especies más sensibles a la construcción, llenado y operación de la hidroeléctrica en el río Sogamoso. Para los loricaridos la reducción de caudal del río Sogamoso puede disminuir sus hábitats y limitar la conexión con los afluentes a través de los cuales migra.
REFLECTIONS ON THE CONCEPT OF DISEASE AND ITS TREATMENT IN PLANTS
María Elena Bernal Vera,Elmer Casta?o Ramírez
Luna Azul , 2007,
Abstract: This article constitutes a reflection on plant diseases and the recent distortions on its conceptualization by agricultural technicians.
The Effect of Audio Visual Entrainment on Pre-Attentive Dysfunctional Processing to Stressful Events in Anxious Individuals  [PDF]
Guadalupe Villarreal Trevi?o, Ernesto Octavio López Ramírez, Guadalupe Elizabeth Morales Martínez, Claudia Castro Campos, María Elena Urdiales Ibarra
Open Journal of Medical Psychology (OJMP) , 2014, DOI: 10.4236/ojmp.2014.35038
Abstract: Experimental single case studies on automatic processing of emotion were carried on a sample of people with an anxiety disorder. Participants were required to take three Audio Visual Entrainment (AVE) sessions to test for anxiety reduction as proclaimed by some academic research. Explicit reports were measured as well as pre-attentive bias to stressing information by using affective priming studies before and after AVE intervention. Group analysis shows that indeed AVEs program applications do reduce anxiety producing significant changes over explicit reports on anxiety levels and automatic processing bias of emotion. However, case by case analysis of six anxious participants shows that even when all of the participants report emotional improvement after intervention, not all of them reduce or eliminate dysfunctional bias to stressing information. Rather, they show a variety of processing styles due to intervention and some of them show no change at all. Implications of this differential effect to clinical sets are discussed.
Lipopolysaccharide (LPS) from E. coli has detrimental effects on the intestinal morphology of weaned pigs
Parra S,Jaime; Agudelo T,Jorge; Ortiz,Laura; Ramírez,María C; Rodríguez,Berardo; López Herrera,Albeiro;
Revista Colombiana de Ciencias Pecuarias , 2011,
Abstract: early weaning predisposes the pig intestine to structural and functional alterations, due to the increase in e. coli populations. these bacteria use the lipopolysaccharide (lps) derived from their cell wall as an important pathogenic factor. little is known about the effects of lps on the intestinal morphology. such knowledge could be helpful in understanding the pathogenesis of post-weaning enteritis, which is needed to design therapeutic strategies. objective: this study aimed to evaluate the effects of the oral intake of lpson the morphology of intestinal villi and glands of weaned pigs. methods: the study used 52 pigs weaned at 21 days. the animals were fed a basal diet added with four levels of lps (0.0, 0.3, 0.5 and 1.0 μg/mg of food) for 10 days. pigs were sequentially slaughtered on days 1, 5, 7 and 10 after weaning, and samples of small intestine were taken to evaluate morphological parameters by computerized image analysis. the statistical design used was randomized blocks in a 4x4 factorial arrangement. results: results showed that lps decreases the height and area of intestinal villi, and increases the width of the villi and the depth and width of the intestinal glands. these effects probably contribute to a decreased intestinal nutrient absorption and increase co-infection with other pathogens, thus leading to the post-weaning diarrhea syndrome. conclusions: this study stresses the usefulness of computerized morphometric analysis to evaluate the effect of lps on intestinal morphology, so it may be used in future studies to investigate the pathophysiology of the causative agents of enteritis and to evaluate therapeutic strategies.
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