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Search Results: 1 - 10 of 210341 matches for " FABIOLA LóPEZ-BARRERA "
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Dispersión de semillas por aves en un paisaje de bosque mesófilo en el centro de Veracruz, México: Su papel en la restauración pasiva
HERNáNDEZ-LADRóN DE GUEVARA,IVETTE; ROJAS-SOTO,OCTAVIO R; LóPEZ-BARRERA,FABIOLA; PUEBLA-OLIVARES,FERNANDO; DíAZ-CASTELAZO,CECILIA;
Revista chilena de historia natural , 2012, DOI: 10.4067/S0716-078X2012000100007
Abstract: seed dispersal by birds may play a major role in the successful natural forest restoration process as birds can deposit pioneer and primary seeds species, thereby defining the recovery of plant community composition over time. in this study, seed ingestion and dispersion by frugivorous birds were analyzed as processes facilitating the restoration of tropical cloud montane forests in central veracruz, mexico. birds were classified according to their affinity to the forest and their preference to a particular forest stratum, in order to determine whether these factors were related to the richness, abundance and diversity of ingested and dispersed seeds. we analyzed 93 fecal samples from 23 bird species. a total of 2699 seeds from 17 plant species were found in the fecal samples, the most abundant seed was from the shrub conostegia xalapensis. we analyzed the correlation between seed size and beak size for the six most frequently captured bird species. we also evaluated the effect of bird ingestion on seed germination by performing two experiments, the first one using the total number of seeds found in fecal samples, and the second one using c. xalapensis seeds that were administered artificially to the birds and their germination compared with control seeds. we found significant differences among the ingested seed diversity indexes for the most commonly captured birds, which supports a differential seed consumption and dispersion. however, there were no significant differences of the seed abundance and richness between birds with different forest affinity or forest stratum preference. also, there was no significant association between seed size and the height and the width of the beak, but there was a difference found in the length measured from the base and from the nostrils. from the total seed species, 59 % germinated from fecal samples belonging to 78 % of the bird species. as has been suggested for lowland tropical forests, this study also showed that in tropical
Dispersión de semillas por aves en un paisaje de bosque mesófilo en el centro de Veracruz, México: Su papel en la restauración pasiva Seed dispersal by birds in a cloud forest landscape in central Veracruz, Mexico: Its role in passive restoration
IVETTE HERNáNDEZ-LADRóN DE GUEVARA,OCTAVIO R ROJAS-SOTO,FABIOLA LóPEZ-BARRERA,FERNANDO PUEBLA-OLIVARES
Revista chilena de historia natural , 2012,
Abstract: La dispersión de semillas por aves puede jugar un papel determinante en el éxito de la restauración pasiva de los bosques ya que las aves pueden depositar semillas de especies pioneras y primarias, definiendo con ello la recuperación de la composición de la comunidad vegetal en el tiempo. En este trabajo se analizó la ingesta y dispersión de semillas por aves frugívoras como coadyuvantes en la restauración del bosque mesófilo de monta a en el centro de Veracruz, México. Las aves fueron clasificadas de acuerdo a su afinidad por el bosque y al estrato arbóreo en que concentran su actividad, con el fin de determinar si estas características se relacionan con la abundancia, riqueza y diversidad de las semillas que ingieren y dispersan. Se analizaron 93 excretas de 23 especies de aves; en ellas se encontraron 2699 semillas de 17 especies vegetales, siendo las más abundantes las del arbusto Conostegia xalapensis. Analizamos la correlación entre tama o de las semillas y tama o del pico para las seis especies de aves más capturadas. Complementariamente, evaluamos el efecto de la ingesta de semillas por aves sobre la germinación, realizando dos experimentos, uno con el total de las semillas obtenidas en las excretas, y otro con semillas de C. xalapensis que fueron administradas a las aves artificialmente y su germinación comparada con semillas control. Se encontraron diferencias significativas entre los índices de diversidad de semillas ingeridas para las seis especies de aves con mayor número de registros, lo que sugiere un consumo diferencial. Sin embargo, no se encontraron diferencias significativas en la riqueza y abundancia de semillas consumidas entre aves con diferente afinidad al bosque y preferencia de estrato arbóreo. Tampoco se observó una asociación significativa entre el tama o de semillas con el ancho y lo alto del pico, pero sí con la longitud tomada desde la base y desde los nostrilos del mismo. Del total de las especies de semillas encontradas, el 59 % germinó en las excretas del 78 % de las especies de aves. Este trabajo muestra que en los bosques mesófilos de monta a las aves son agentes dispersores importantes de especies de plantas pertenecientes a bosques secundarios y también dispersores de algunas plantas del bosque primario, por ello son agentes que facilitan el proceso de sucesión forestal. Seed dispersal by birds may play a major role in the successful natural forest restoration process as birds can deposit pioneer and primary seeds species, thereby defining the recovery of plant community composition over time. In this study, seed inge
Estructura y función en bordes de bosques
Fabiola López Barrera
Ecosistemas , 2004,
Abstract: Recientemente algunos estudios de la fragmentación de bosques han probado hipótesis mecanísticas sobre el efecto del borde en procesos ecológicos tales como las interacciones planta-animal. Experimentos que comparan bordes con distinta estructura indican que estas diferencias tienen gran influencia en la dirección y magnitud de la penetración de los efectos de borde. El considerar a los bordes como membranas que modulan el intercambio de materia y organismos entre dos hábitats ha llevado al concepto de permeabilidad de bordes. La permeabilidad determinada por distintos tipos de bordes (suaves o abruptos) tiene importantes implicaciones en términos de la conservación y la regeneración de bosques, así como en el manejo de la vida silvestre.
La Psicología del Hombre: Hacia lo Irrecuperable y lo Azaroso
Eduardo Barrera López
Tesis Psicológica , 2006,
Abstract: El diálogo entre la Psicología y la Filosofía alrededor de los problemas relacionados con el conocimiento llevan a hacer una reflexión crítica sobre el sujeto. ésto es, la manera en la cual el mismo hombre se ha ideado su propia imagen, la cual resulta canónica en una estructura moderna del pensamiento. Considerar la concepción del hombre más allá de un plano dicotómico entre afectividad y cognición o más allá de una mirada monista es el sentido de la propuesta que desde la sensibilidad integra en una condición compleja la noción de hombre y propone los problemas para la Psicología. El interés implica un programa epistemológico en donde las propuestas de la Psicología genética guían la discusión y la categoría mente se asume como el eje central del encuentro. Lo humano se ha construido como algo irrecuperable, cotidiano y mortal. Está en una permanente tensión entre las leyes de la vida y sus propias determinaciones y acciones en el contexto de lo imprevisible y lo azaroso. Es un sistema dinámico inestable.
Biblioteca de Documentación Internacional Contemporánea. Fondo de archivos sobre historia, memoria y justicia en el Cono Sur
Fabiola Rodríguez López
Anuario Americanista Europeo , 2004,
Abstract: Desde hace unos diez a os el tema “Historia, memoria y justicia en América Latina” ha tomado mucha importancia y en particular en los países del Cono Sur. La BDIC ha continuado, respetando el mismo deseo de sus fundadores Louise Charlier y Henri Leblanc, de recopilar todo tipo de documentos de todos los países y en diferentes lenguas. En lo que se refiere a este tema tenemos numerosos documentos como libros, folletos, volantes, literatura gris, archivos ya sean escritos, en microfilm o audiovisuales. Estos fondos han llegado a la biblioteca gracias a la generosidad de personas interesadas en conservar la memoria del pasado reciente.
Involvement of Estrogen Receptors in the Anxiolytic-Like Effect of Phytoestrogen Genistein in Rats with 12-Weeks Postovariectomy  [PDF]
Juan Francisco Rodríguez-Landa, Fabiola Hernández-López, Margarita Saavedra
Pharmacology & Pharmacy (PP) , 2012, DOI: 10.4236/pp.2012.34059
Abstract: Phytoestrogens are natural compounds found in some vegetables, and they replicate many of the physiochemical and physiological properties of estrogens, including the regulation of mood. The phytoestrogen genistein exerts anxiolytic-like effects in rats with a chronic absence of ovarian hormones, but the mechanism involved in this effect remains to be explored. The present study explored the participation of estrogen receptor-β in the anxiolytic-like effect of genistein (1.0 mg/kg, i.p., for 4 days) in Wistar rats with 12-weeks postovariectomy, considered as experimental model of post-surgical menopause. In the light/dark test, a useful tool for anxiety study and for the screening of anxiolytic drugs, genistein reduced the latency to enter and increased the time spent in the light compartment and significantly increased the frequency and time spent exploring the light compartment compared with the control group, which is considered as an anxiolytic-like effect at experimental level. All behavioral effects produced by genistein in the light/dark test were blocked by previous tamoxifen administration (5.0 mg/kg, s.c., for 6 days), a non selective antagonist for estrogen receptor-β. The effects produced by genistein or tamoxifen in this test were not related to significant changes in general motor activity evaluated in the open field test. In conclusion, the specific contribution of present investigation was identify that estrogen receptor-β is involved in the anxiolytic-like effect produced by phytoestrogen genistein in rats with a long-term absence of ovarian hormones; supporting the hypothesis that estrogen receptor-β participates in the regulation of anxiety associated with low concentration of ovarian hormones and in the anxiolytic-like effects produced by natural estrogenic compounds such as phytoestrogens.
Discapacidad y cultura: desafío emergente en investigación
CASTELLANOS SORIANO,FABIOLA; LóPEZ,LUCERO;
Avances en Enfermería , 2009,
Abstract: documentary study that reviews research on the disability culture relation. objectives: 1. to qualify all articles published in databases since 1997 until the firs quarter of 2007 that considered the disability - culture relation; 2. to identify research trends based on articles found. methodology: systematic search of databases: proquest, ebsco, science direct, medline, lilacs, index, wilson web and ovid. 31 articles were selected corresponding to research results and literature reviews. results: the number of articles found suggests that re-search on this subject matter is just beginning. in the subject matter categories we found: that 54,85% correspond to cultural influences in the experience of families and caregivers of disabled people, 19,35% to stigma and disability, 9,67% to health services and rehabilitation in disability, 6,45% to parents'beliefs on disability, 6,45% a disability in older adults and 3,22% to education of children with a disability. 61,2% of the studies have a qualitative approach, 22,5% are quantitative and 16,1% correspond to literature reviews. the findings show four main categories: cultural perception of the disability, perceptions and beliefs on the nature of the disability, role of parents and families in the disability and relation with health services. final considerations: more research is required on disability and culture from the view of several disciplines which should include latin american contexts that contribute to the integral understanding of disabled people of all ages and social groups.
Discapacidad y cultura: desafío emergente en investigación Disability and culture: emerging challenge in research Incapacidade e cultura: desafio emergente em pesquisa
SORIANO FABIOLA CASTELLANOS,LóPEZ LUCERO
Avances en Enfermería , 2009,
Abstract: Estudio documental que revisa investigaciones sobre la relación discapacidad y cultura. Objetivos: 1. caracterizar los artículos publicados en bases de datos internacionales desde 1997 hasta el primer trimestre de 2007 que consideraban la relación discapacidad y cultura; 2. identificar las tendencias investigativas a partir de los artículos encontrados. Metodología: búsqueda sistemática en las bases de datos: Proquest, Ebsco, Science direct, Medline, Lilacs, Index, Wilson Web y Ovid. Se seleccionaron 31 artículos correspondientes a resultados de investigaciones y revisiones de literatura. Resultados: el número de artículos encontrados sugiere que la investigación en esta temática es aún incipiente. En las categorías temáticas se encontró: 54,85% corresponden a influencias culturales en la experiencia de familias y cuidadores de personas con discapacidades, 19,35% a estigma y discapacidad, 9,67% a servicios de salud y rehabilitación en discapacidad, 6,45% a creencias de los padres sobre la discapacidad, 6,45% a discapacidad en adultos mayores y 3,22% a educación de ni os con discapacidad. El 61,2% de los estudios tienen un enfoque cualitativo, el 22,5% son cuantitativos y el 16,1% correspondieron a revisiones de literatura. Los hallazgos muestran cuatro categorías principales: percepción cultural de la discapacidad, percepciones y creencias de la naturaleza de la discapacidad, rol de los padres y las familias en la discapacidad y relación con los servicios de salud. Consideraciones finales: se requieren más investigaciones en discapacidad y cultura desde la mirada de diversas disciplinas que incluyan contextos latinoamericanos que aporten a la comprensión integral de las personas en situación de discapacidad de todas las edades y grupos sociales. Documentary study that reviews research on the disability culture relation. Objectives: 1. to qualify all articles published in databases since 1997 until the firs quarter of 2007 that considered the disability – culture relation; 2. to identify research trends based on articles found. Methodology: systematic search of databases: Proquest, Ebsco, Science direct, Medline, Lilacs, Index, Wilson Web and Ovid. 31 articles were selected corresponding to research results and literature reviews. Results: the number of articles found suggests that re-search on this subject matter is just beginning. In the subject matter categories we found: that 54,85% correspond to cultural influences in the experience of families and caregivers of disabled people, 19,35% to stigma and disability, 9,67% to health services and rehabilita
Concurrent Liver Hodgkin Lymphoma and Nodular Regenerative Hyperplasia on an Explanted Liver with Clinical Diagnosis of Alcoholic Cirrhosis at University Hospital Fundación Santa Fe de Bogotá
R. López,L. Barrera,A. Vera,R. Andrade
Case Reports in Pathology , 2014, DOI: 10.1155/2014/193802
Abstract: Liver involvement by Hodgkin lymphoma (HL) is well documented. However, secondary liver failure to this neoplastic process is rare and usually presents late in the course of the disease. We present a case of a HL associated with nodular regenerative hyperplasia (NRH) diagnosed on an explanted liver from a 53-year-old patient with clinical diagnosis of alcoholic cirrhosis. Hematoxylin and eosin stain (H&E) showed abnormal liver architecture with hepatocytes nodules highlighted by reticulin stain with absent fibrosis on the trichrome stain. The portal spaces had diffuse infiltration by Reed-Sternberg cells positive for CD15, CD30, and latent membrane protein (LMP) on immunohistochemical studies. The patient also had a concurrent hilar lymph node biopsy that also showed HL involvement. Liver failure as the initial presentation of Hodgkin’ lymphoma is rare. We believe that more research about the utility of performing liver biopsies in patients candidates for transplantation with noncirrhotic hepatic failure is needed in order to establish the etiology and the optimal treatment. 1. Introduction Liver involvement by Hodgkin’s lymphoma (HL) is well documented [1] and secondary liver failure usually presents late in the course of the disease; however, there are some HL cases that present as a primary acute liver failure [2]. It is believed that hepatic failure by HL is due to bile duct destruction and direct tissue infiltration by the neoplastic cells [1, 2]. 2. Case Report The clinical history is that of a 53-year-old man who presented to our hospital with hepatic encephalopathy; his clinical history was positive for 18 years of alcohol abuse. He referred; recurrent ascites and six episodes of upper gastrointestinal bleeding from portal origin. Laboratory tests showed aspartate aminotransferase (AST) 35?U/L (5–34?U/L), alanine transaminase (ALT) 31?U/L (<55?U/L), alkaline phosphatase 215?U/L (woman >15 years old: 40–150), gamma-glutamyltransferase (GGTP) 368?U/L (Adult woman: 9–36), serum bilirubin 1.6?mg/dL (Total 0,2–1?mg/dL), direct bilirubin 0.76?mg/dL (0.10–0.5?mg/dL), indirect bilirubin 0.85?mg/dL, albumin 3.5?g/dL (3.4–5.4?g/dL), platelets 147?(10)3/mm3 (150–450?(10)3/mm3), creatinine 0.71?mg/dL (0.7–1.3?mg/dL), prothrombin time (PT) 14,4?sec (Control 11.1), partial thromboplastin time (PTT) 33.2?sec (Control 28,1), and INR 1.29. The patient was on propranolol 40?mgr once a day, gabapentin 600?mgr three times a day, and omeprazole 20?mgr once a day. Abdominal computed tomography (CT) showed diffuse hypervascular lesions on the liver parenchyma, portal
Identification of threatened areas of environmental value in the Conservation Area of Mexico City, and setting priorities for their protection
Saavedra, Zenia;Ojeda Revah, Lina;López Barrera, Faustino;
Investigaciones geográficas , 2011,
Abstract: almost 60% of the conservation area of mexico city is to the south within the valley of mexico; there is an extensive area of forests, scrub, wetlands, grasslands and agricultural zones. it is important for the city's sustainability because of the environmental services provided such as aquifer recharge, carbon sequestration and biodiversity. it is being threatened by human activities despite a program of ecological regulation; this is partly because environmental problems are not always immediately visible to the government and general public in terms of the need for prompt action. the present study uses spatial evidence to identify and prioritize threatened environmentally valuable areas. data from a variety of sources are combined, and information geo-referenced with geographical information systems is verified in the field. the resultant maps show that the most threatened ecologically valuable areas are as follows: the oak wood and scrub relicts east of milpa alta; the forests west of cuajimalpa, álvaro obregón and magdalena contreras; the forests of the pelado and malacatepec volcanoes in tlalpan; and the forests of the tláloc and chichinautzin volcanoes in milpa alta. these results could be used by decision makers to design timely strategies to protect the conservation area and its supply of environmental services to mexico city.
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