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Search Results: 1 - 10 of 9251 matches for " Ruiz-Picos "
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Gill and Liver Histopathology in Goodea atripinnis Jordan, Related to Oxidative Stress in Yuriria Lake, Mexico
Ruiz-Picos,R; López-López,E;
International Journal of Morphology , 2012, DOI: 10.4067/S0717-95022012000300060
Abstract: in aquatic ecosystems, the complex mixture of pollutants may mediate the formation of free radicals and cause oxidative damage to the biota. yuriria lake (a ramsar site in central mexico) receives input of wastewater from its tributaries, agricultural runoff, and municipal discharge. we studied the lipid peroxidation (lpo), antioxidant enzymes (superoxide dismutase (sod), catalase (cat), and glutathione peroxidase (gpx), and histopathology of gill and liver of the native fish goodea atripinnis in yuriria lake. results were compared to a control group of fish cultivated in the laboratory. lpo, sod, and cat showed no significant differences compared to controls, but gpx showed greater and significant differences in both tissues. three class sizes were identified; organisms of classes i and ii had slight vasocongestion in the liver as compared to controls. hepatocytes of class iii showed cytoplasmic vacuolization, cellular disorganization, and the liver showed marked fibrosis compared to controls. gills of controls and classes i and ii showed no damage in gill filaments. tissue damage in class iii included hypertrophy, loss of the typical morphology, and edema in the gill filaments. the longer exposure of older organisms to yuriria lake conditions may have resulted in their poorer health condition.
Gill and Liver Histopathology in Goodea atripinnis Jordan, Related to Oxidative Stress in Yuriria Lake, Mexico Histopatología en las Branquias e Hígado de Goodea atripinnis Jordan, Relacionada con el Estrés Oxidativo en la Laguna Yuriria, México
R Ruiz-Picos,E López-López
International Journal of Morphology , 2012,
Abstract: In aquatic ecosystems, the complex mixture of pollutants may mediate the formation of free radicals and cause oxidative damage to the biota. Yuriria Lake (a Ramsar site in Central Mexico) receives input of wastewater from its tributaries, agricultural runoff, and municipal discharge. We studied the lipid peroxidation (LPO), antioxidant enzymes (superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx), and histopathology of gill and liver of the native fish Goodea atripinnis in Yuriria Lake. Results were compared to a control group of fish cultivated in the laboratory. LPO, SOD, and CAT showed no significant differences compared to controls, but GPx showed greater and significant differences in both tissues. Three class sizes were identified; organisms of classes I and II had slight vasocongestion in the liver as compared to controls. Hepatocytes of class III showed cytoplasmic vacuolization, cellular disorganization, and the liver showed marked fibrosis compared to controls. Gills of controls and classes I and II showed no damage in gill filaments. Tissue damage in class III included hypertrophy, loss of the typical morphology, and edema in the gill filaments. The longer exposure of older organisms to Yuriria Lake conditions may have resulted in their poorer health condition. En los ecosistemas acuáticos, la mezcla compleja de contaminantes presente puede mediar la producción de radicales libres y causar da o por estrés oxidativo a la biota. La laguna de Yuriria (sitio RAMSAR en la parte central de México) recibe aguas residuales de sus afluentes, escorrentías agrícolas y descargas municipales. Se estudió la peroxidación lipídica (LPO), las enzimas antioxidantes superóxido dismutasa, (SOD), catalasa (CAT) y glutatión peroxidasa (GPx); y la histopatología de las branquias e hígado del pez nativo Goodea atripinnis en la Laguna de Yuriria. Los resultados obtenidos fueron comparados con un grupo control de peces cultivados en laboratorio. La LPO, SOD y CAT no mostraron diferencia significativa en comparación con los controles; pero la GPx mostró diferencias significativas para ambos tejidos. Se identificaron tres clases de talla; los organismos de la clase I y II tuvieron una ligera vasocongestión en el hígado en comparación con los controles. Los hepatocitos de la clase III mostraron vacuolización citoplásmica, desorganización celular y el hígado mostró una marcada fibrosis. Las branquias de los organismos control y de las clases I y II no mostraron da o en sus filamentos. El da o tisular en los organismos de la clase III incluyó hipert
LAS WEBQUEST COMO ESTRATEGIAS METODOLóGICAS ANTE LOS RETOS DE LA CONVERGENCIA EUROPEA DE EDUCACIóN SUPERIOR
Andrés Palacios Picos
Pixel-Bit , 2009,
Abstract: La implantación de los créditos europeos como consecuencia de la Convergencia europea en la Educación Superior va a suponer un cambio significativo en el papel del profesor en los procesos de aprendizaje, en un entorno en el que la clase deberá ir cediendo en importancia a otros espacios virtuales que permitan desarrollar nuevas actividades. En este contexto, adquieren especial relevancia las Webquest como metodologías de ense anza por proyectos, en las que el alumno es el que construye su conocimiento a partir de las acciones que se le proponen y quepreviamente ha programado el profesor.
Rese a de "La población rural en Espa a. De los desequilibrios a la sostenibilidad social" de Luis Camarero (coord.), Fátima Cruz, Manuel González, Julio A. Del Pino, Jesús Oliva y Rosario Sampedro
Xesús A. Lage Picos
Ager : Revista de Estudios Sobre Despoblación y Desarrollo Rural , 2012,
Abstract:
El monte, el cambio social y la cultura forestal en Galicia.
Xesús Adolfo Lage Picos
Revista de Investigaciones Políticas y Sociológicas (RIPS) , 2003,
Abstract: Scrub was historically an essential part of the territory in north-western Iberian peninsula. It was part of reprodution strategies of family farms and rural communities. But these strategies went through an important change from agricultural and cattle raising functions, to consolidate like forest grow surfaces. Definitive crisis of the old traditional agrarian complex in Galicia was traumatic social and ecologically. Demographic process, peasant farms and agrarian economic integrate in agricultural food produce market meeting to scrub lands to neglect, that supposed thousand burn scrubs hectares. In eighties, social renewal uses and scrubs representations opened new horizons to these surfaces. Some circumstances converge to point towards a strong revalorisation of the scrub like multifunctional strategic resource, specially as regards to forested lands.
Desarrollo de tecnologías de Avanzada para la producción de Fármacos: Análisis Informétrico
Laza Loaces,Dayami; Gómez Carril,Martha; Ramos Picos,Diana;
Revista Cubana de Farmacia , 2001,
Abstract: the significant development of the pharmaceutical industry during the last decades shows the marked interest of researchers and scientific institutions in the drug design, which reaches fast an effective therapeutic level of the drug in a short time and that lasts from the total recovery of the patient to the complete elimination of the symptoms. an informetric analysis of the trends of research on this topic during the last years was made by using the information existing on the international pharmaceutical abstract and on the medline databases. these 2 databases contain bibliographic information on pharmacy, medicine, pharmacology, toxicology, etc., that may be analyzed by automated means. after a detailed analysis on the relevance of the articles, a database of 2 855 entries was obtained.
Comparative analysis of leaf essential oil constituents of Piliostigma thonningii and Piliostigma reticulatum
Tira-Picos Viana,Nogueira Joseph,Gbolade Adebayo
International Journal of Green Pharmacy , 2010,
Abstract: Hydro-distilled essential oils from leaves of Piliostigma thonningii and P. reticulatum (Caesalpiniaceae) were studied by combined gas chromatography and gas chromatography-mass spectrometry for the first time. Both qualitative and quantitative differences existed in the composition of the two oils. While P. thonningii oil is composed of sesquiterpenes and monoterpene hydrocarbons, monoterpenes and sesquiterpene hydrocarbons represented the chief class of terpenoids in P. reticulatum. Major constituents in P. reticulatum leaf oil were γ-muurolene (10.3%), α-pinene (9.4%), tricyclene (7.2%), δ-cadinene (5.6%), α-terpineol (5.3%) and β-caryophyllene (4.2%). However, the sesquiterpene-rich P. thonningii oil was characterized by β-myrcene (13.3 %), limonene (8.6%), α-pinene (7.6%), β-caryophyllene (7.1%), γ-muurolene (6.1%), caryophyllene oxide (5.2%) and spathulenol (4.0%).
Comparative analysis of essential oils from the leaf, fruit and stem bark of Harungana madagascariensis
Gbolade Adebayo,Tira-Picos Viana,Nogueira Joseph,Oladele Adekunle
International Journal of Green Pharmacy , 2009,
Abstract: A comparative analysis of hydro-distilled essential oils of the leaf, stem bark and fruit of Harungana madagascariensis was carried out by gas chromatography-mass spectroscopy (GC-MS) for the first time. Both qualitative and quantitative differences existed in the composition of the three oils which comprised mainly sesquiterpene hydrocarbons (66.8-69.6%). β-caryophyllene (32.4% and 18.4% respectively, for leaf and fruit oils only), α-humulene (10.4%, 9.8% and 7.3% respectively for leaf, stem bark and fruit oils), germacrene D (8.7% for leaf oil only), and α-farnesene (37.4% and 10.4% respectively, for stem bark and fruit oils only) were the predominant constituents.
Desarrollo de tecnologías de Avanzada para la producción de Fármacos: Análisis Informétrico
Dayami Laza Loaces,Martha Gómez Carril,Diana Ramos Picos
Revista Cubana de Farmacia , 2001,
Abstract: El desarrollo significativo que ha presentado en las últimas décadas del siglo la Industria Farmacéutica, muestra un marcado interés por investigadores e instituciones científicas en el dise o de medicamentos, con un alcance rápido de un nivel terapéutico efectivo del fármaco en un tiempo breve, que dure desde la recuperación total del paciente hasta la eliminación completa de los síntomas que se quieren suprimir. Se realizó un análisis informétrico sobre las tendencias de investigación en la temática durante los últimos a os y para ello se utilizó la información que sobre el tema existe en las bases de datos International Pharmaceutical Abstract y Medline. Estas 2 bases contienen información bibliográfica sobre farmacia, medicina, farmacología, toxicología, etc., susceptible de ser analizada por medios automatizados. Se obtuvo como resultado, después de un análisis minucioso sobre la relevancia de los artículos, una base de datos con 2 855 registros. The significant development of the Pharmaceutical Industry during the last decades shows the marked interest of researchers and scientific institutions in the drug design, which reaches fast an effective therapeutic level of the drug in a short time and that lasts from the total recovery of the patient to the complete elimination of the symptoms. An informetric analysis of the trends of research on this topic during the last years was made by using the information existing on the International Pharmaceutical Abstract and on the Medline databases. These 2 databases contain bibliographic information on pharmacy, medicine, pharmacology, toxicology, etc., that may be analyzed by automated means. After a detailed analysis on the relevance of the articles, a database of 2 855 entries was obtained.
Tecnología de aplicación terrestre para el control de insectos en el cultivo de soja Application of terrestrial technology for control of insects in soybean crop
Juan J. Olivet,Carlos D. Picos,Juana Villalba,Stella Zerbino
Revista Brasileira de Engenharia Agrícola e Ambiental , 2013,
Abstract: Se realizaron dos ensayos para evaluar la eficiencia de deposición y el control de insectos con diferentes métodos de aplicación en el cultivo de soja en Uruguay. En el primer ensayo se estudió el efecto del tama o de gotas, velocidad de aplicación y horario de aplicación en el control de epinotia (Epinotia aporemai W.) El segundo ensayo se dedicó al efecto del tama o de gotas y la velocidad de aplicación en el control de chinches (Nezara viridula L. y Piezodorus guildinii W.). Se evaluó la distribución de un trazador fluorescente y conteo sobre el follaje. La densidad de impactos fue mayor con gotas finas y medias que con gotas muy gruesas en el haz en ambos estratos, en el envés la densidad de impactos fue similar entre tama os de gota. En el estrato medio el aumento de la velocidad produjo disminución de la densidad de impactos. En ese estrato, los impactos en el envés fueron muy escasos. El control de epinotia y chinches fue mayor en las parcelas tratadas que en el testigo sin tratar, sin embargo, los diferentes tama os de gota, velocidad y horario de aplicación tuvieron un control similar. Se destaca la conveniencia de utilización de gotas muy gruesas y medias en el control de insectos en soja por su eficacia y potencial de disminución de la deriva. Two trials were conducted for efficiency of spray-deposit distribution and for insect control in soybean crop in Uruguay. In the first one the effects of droplet size, volume application rate and application time in the control of bean shoot borer (Epinotia aporemai W.) were evaluated. The second trial consisted in evaluating the effects of droplet size and application speed in the control of shield bugs (Nezara viridula L. and Piezodorus guildinii W.). Distribution of a fluorescent dye was evaluated by counting impact on the foliage in the middle and upper canopy. Impact density was higher with fine and medium compared to very coarse droplets on the upper side of the leaves in both trials, but on the inner side, impact density was similar among the three evaluated droplet sizes. Increasing application speed decreased impact density, particularly at the middle height of the foliage. At this height, impact on the underside of leaves was extremely low. Insect control was higher in treated than untreated plots, however, different droplet size, speed and application time resulted in similar control. The results emphasize convenience of very large and medium droplets in the control of insects in soybean due to its efficacy and drift potential reduction.
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