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Search Results: 1 - 10 of 136201 matches for " Víctor; Cardona Maya "
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Efecto de cinco extractos de plantas colombianas sobre espermatozoides humanos
Gallego,Ginet; Henao,Dubier; Ospina,Luisa; álvarez Gómez,ángela; Arango,Víctor; Cardona Maya,Walter; Cadavid,ángela;
Revista Cubana de Plantas Medicinales , 2012,
Abstract: introduction: the sperm capacitation test and the spermicidal activity or immobilization using plant extracts, allows for an increase in the current knowledge on the reproductive area. objectives: to evaluate the effect of five extracts from colombian plants bocconia frutescens, bomarea setaceas, muehlenbeckia platyclada, zanthoxylum lenticulare and piper subpedale on human spermatozoa. methods: human spermatozoa were incubated with each extract and their motility and viability were evaluated. additionally, sperm capacitation was evaluated using bovine serum albumin. results: after an initial assessment of the effect of plant extracts on human spermatozoa, the extracts from b. frutescens and b. setaceas were selected for capacitating tests since they did not change the sperm motility and viability. additionally, m. platyclada, z. lenticulare and p. subpedale extracts were selected for immobilization or spermicidal activities tests because they had had an effect on sperm progressive motility. conclusions: this study suggested three plants with promising spermicidal effect; in addition to the standardization of a biological system, allowing the assessment of the capacitation effect of some extracts over human spermatozoa.
NOVEDADES PARA LA UREDOBIOTA COLOMBIANA CITADAS A PARTIR DE LOS ESPECíMENES DEPOSITADOS EN EL U.S. NATIONAL FUNGUS COLLECTIONS (BPI)
Pardo Cardona,Víctor Manuel;
Revista Facultad Nacional de Agronomía, Medellín , 2010,
Abstract: starting from revision and search in the u.s. national fungus collections (bpi) database and the tags of the species placed in its mycologic herbary, are registered for first time for colombia, 11 species of uredinales (rust fungi), 4 botany families an 53 species of plant hosts.
UREDINALES DE PLANTAS CULTIVADAS DE INTERéS FLORAL EN COLOMBIA
Pardo Cardona,Víctor Manuel;
Revista Facultad Nacional de Agronomía, Medellín , 2006,
Abstract: thirty species of uredinales (rust fungi) are registered in colombia parasitizing 26 species of cultivated flowers belonging to 21 genera and 15 botanical families. puccinia hemerocallidis thuemen is a new record for colombia and the andean zone of south america. puccinia antirrhini dietel & holway and uromyces gladioli p. hennings are first records for colombia.
NOVEDADES PARA LA UREDOBIOTA COLOMBIANA CITADAS A PARTIR DE LOS ESPECíMENES DEPOSITADOS EN EL U.S. NATIONAL FUNGUS COLLECTIONS (BPI) NEWS FOR THE COLOMBIAN UREDOBIOTA FROM THE U.S. NATIONAL FUNGUS COLLECTIONS (BPI)
Víctor Manuel Pardo Cardona
Revista Facultad Nacional de Agronomía, Medellín , 2010,
Abstract: A partir de la revisión y búsqueda en la base de datos del U.S. National Fungus Collections (BPI) y en los marbetes de los especímenes depositados en su herbario micológico, se registran por primera vez para Colombia 11 especies de Uredinales (royas), 4 familias botánicas y 53 especies de hospedantes. Starting from revision and search in the U.S. National Fungus Collections (BPI) database and the tags of the species placed in its mycologic herbary, are registered for first time for Colombia, 11 species of Uredinales (rust fungi), 4 botany families an 53 species of plant hosts.
UREDINALES DE PLANTAS CULTIVADAS DE INTERéS FLORAL EN COLOMBIA UREDINALES OF CULTIVATED FLOWERS IN COLOMBIA
Víctor Manuel Pardo Cardona
Revista Facultad Nacional de Agronomía, Medellín , 2006,
Abstract: Treinta especies de Uredinales (royas) se han registrado en Colombia parasitando a veintiseis especies de plantas cultivadas de interés floral comprendidas en 21 géneros y 15 familias botánicas. Se registra para Colombia y la zona andina de Sudamérica a Puccinia hemerocallidis Thuemen. Se confirma la presencia en Colombia de Puccinia antirrhini Dietel & Holway y Uromyces gladioli P. Hennings. Thirty species of Uredinales (rust fungi) are registered in Colombia parasitizing 26 species of cultivated flowers belonging to 21 genera and 15 botanical families. Puccinia hemerocallidis Thuemen is a new record for Colombia and the Andean zone of South America. Puccinia antirrhini Dietel & Holway and Uromyces gladioli P. Hennings are first records for Colombia.
Primer registro para Venezuela de Puccinia hemerocallidis Thüm., la roya del lirio de la ma?ana
Manuel,Víctor; Cardona,Pardo; Caruso,Denisse; Rojas,Thamara;
Agronomía Tropical , 2008,
Abstract: puccinia hemerocallidis, the daylily rust is recorded for first time for colonia tovar, aragua-venezuela. the fungus is described. observations on his symptomatology, life cycle, sporic stages, ecology and geographical distribution are done. in the studied collection the teleomorphic and uredial anamorphic stages were detected.
Uso del microhábitat por hembras grávidas de la rana de hojarasca Craugastor loki en la selva alta perennifolia de Los Tuxtlas, Veracruz, México
Urbina-Cardona, José Nicolás;Reynoso, Víctor Hugo;
Revista mexicana de biodiversidad , 2009,
Abstract: craugastor loki is the dominant amphibian in the los tuxtlas tropical rainforest. we recorded 1 251 individuals (58% adults) in a sampling year within a great variety of microhabitats in 6 forest fragments. although c. loki is considered tolerant to habitat disturbance, 71% of all gravid females were found in most highly conserved sites. gravid females were mostly found in the largest forest fragment with continuous rainforest (473 ha), preferring habitats with distances to the edge over 50 m, soils with high leaf litter cover and depth, high understory density, high relative humidity but independent of the distance to water bodies. gravid females, a critical element to maintain the species, are very vulnerable to habitat loss and edge effects. a change in conserved habitats may affect c. loki abundance and population structure, potentially seriously disrupting the trophic chains and community structure of the rainforest.
Uso del microhábitat por hembras grávidas de la rana de hojarasca Craugastor loki en la selva alta perennifolia de Los Tuxtlas, Veracruz, México Microhabitat use by the leaf litter frog Craugastor loki gravid females in the tropical rainforest at Los Tuxtlas, Veracruz, Mexico
José Nicolás Urbina-Cardona,Víctor Hugo Reynoso
Revista mexicana de biodiversidad , 2009,
Abstract: Craugastor loki es la especie de anfibio más abundante en la selva alta perennifolia de Los Tuxtlas, registrándose 1 251 individuos (58% adultos) durante un a o de muestreo a lo largo de gran variedad de microhábitats en 6 fragmentos de selva. A pesar de que C. loki se considera una especie tolerante a la modificación del hábitat, el 71% de las hembras grávidas se encontraron en las áreas mejor conservadas. Hubo un mayor registro de hembras grávidas en el fragmento de selva continuo (473 ha), prefiriendo hábitats con una distancia mayor a 50 m del borde y suelos con cobertura y espesor de hojarasca altas, cobertura herbácea alta, humedad relativa alta, pero independientes de la distancia a los cuerpos de agua. En el presente estudio se demuestra que las hembras grávidas, un eslabón crítico para el mantenimiento de la especie, son vulnerables a la perdida de hábitat y efectos de borde. Un cambio en las zonas conservadas pudiera afectar la abundancia y estructura poblacional de C. loki, generando a futuro una peligrosa disrupción en la cadena trófica y en la estructura de las comunidades de la selva. Craugastor loki is the dominant amphibian in the Los Tuxtlas tropical rainforest. We recorded 1 251 individuals (58% adults) in a sampling year within a great variety of microhabitats in 6 forest fragments. Although C. loki is considered tolerant to habitat disturbance, 71% of all gravid females were found in most highly conserved sites. Gravid females were mostly found in the largest forest fragment with continuous rainforest (473 ha), preferring habitats with distances to the edge over 50 m, soils with high leaf litter cover and depth, high understory density, high relative humidity but independent of the distance to water bodies. Gravid females, a critical element to maintain the species, are very vulnerable to habitat loss and edge effects. A change in conserved habitats may affect C. loki abundance and population structure, potentially seriously disrupting the trophic chains and community structure of the rainforest.
Anafilaxia
Ricardo Cardona Villa,Fernando Montoya Maya,Julio César Orrego A.,Helí Salgado Vélez
Iatreia , 2000,
Abstract: Las reacciones alérgicas fatales se describen desde hace más de 4.500 a os (1), pero sólo desde el siglo pasado se empezó a comprender su fisiopatología. En 1902, Portier y Richet describieron una reacción sistémica fatal en algunos de sus animales de experimentación al inyectar repetitivamente una proteína de anémona marina, previamente tolerada (2); este fenómeno se denominó anafilaxia, para distinguirlo de la profilaxis (inyección de productos biológicos para la prevención de enfermedades). Hoy se define la anafilaxia como una reacción sistémica de hipersensibilidad inmediata, mediada por inmunoglobulina E (IgE), con liberación de mediadores proinflamatorios por los mastocitos y basófilos. La anafilaxia posee dos fases, la primera de sensibilización y la segunda efectora, como respuesta al reingreso del alergeno. El término reacción anafilactoide se refiere a un evento clínico similar, no mediado por IgE (3). Los informes clínicos iniciales sobre anafilaxia (4) mostraron una proporción elevada de casos tras la administración de suero equino utilizado en las antitoxinas para difteria y tétanos (3). Desde hace más de 4.000 a os los venenos de Himenópteros son desencadenantes frecuentes de anafilaxia y aún hoy siguen siendo un problema clínico de importancia; se estima que en los Estados Unidos se generan 40 muertes al a o por esta causa.
Efecto del anabólico acetato de trembolona sobre el crecimiento de Carassius auratus (Pisces: Cyprinidae)
Mara?ón Herrera, Samuel;Tijera Demesa, Víctor;Salgado Zamora,ctor;Maya Pe?a, Eduardo;
Hidrobiológica , 2008,
Abstract: the anabolic efficiency of steroid trenbolone acetate was evaluated in 60 days old juveniles of carassius auratus. fish were exposed during 120 days to steroid at a dose of 300 mg/kg food. total length, standard length, height and weight were registered every two weeks. the benefit of the steroid was characterized with a model that relates the weight as a function of time, coupled to other two models: one where size is related with time and an alometric one which correlates weight with size. the models showed that growth of steroid treated fish was superior to that of untreated (control) fish, differing significantly (p <0.001), while the alometric model for each treatment, indicated a similar growth (p>0.05). analysis of the variability of the three models demonstrated that the estimates adequately described the growth. this was further confirmed by the determination coefficient (r2) that fluctuated between 72.9 and 93.5% and by the distribution analysis of size and weight by means of box plots. it was concluded that application of the steroid trenbolone acetate to carassius auratus was successful. a survival rate of 100% was registered coupled to an efficient anabolic effect, since a 48.0% gain of biomass and 41.3% increase in size were obtained as compared to the control group.
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