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Search Results: 1 - 10 of 27714 matches for " FERNANDO áNGEL "
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Algunas reflexiones sobre el contenido del derecho a la igualdad de las víctimas en el marco de la experiencia de justicia transicional en Colombia
ángel Fernando Castro
Revista Derecho del Estado , 2006,
Abstract:
Determinantes de éxito en la participación de los grupos de investigación latinoamericanos en programas de cooperación científica internacional
Cuadros,Alejandra; Martínez,ángel; Torres,Fernando;
Interciencia , 2008,
Abstract: the results of the vi european union framework program on international scientific cooperation show little participation by developing countries. in the 90s, latin america reached an average of 7% of all the participation of developing countries in this program. unfortunately, the resources are scarce and competition is high. therefore, in the evaluation process the excellence of the participants is revised; resources and research capacities of the groups are evaluated, so as to assure the scientific quality of the project. this work analyzes the factors that influence success of latin american research groups in programs of scientific cooperation. the general characteristics of the groups, institutional support and motivation to participate are also revised. the results show that the factors affecting success are years of existence, scientific and technological production, experience in interdisciplinary projects and the information and communication structures. it is also verified that being motivated to participate in order to increase prestige and visibility has negative effects on the probability of approval.
Modelos probabilísticos de los contenidos porcentuales de pérdida al fuego, residuo insoluble y SO3 de cementos P-350 fabricados en Espa a
Salcedo Martínez, Fernando,Arteaga Iriarte, ángel
Materiales de Construccion , 1985,
Abstract: Limits fixed in Codes for the chemical characteristics of cements have been established with semi-empirical methods, given the complexity of influencing phenomena, without correspondence between these values and the physico-chemical or mechanical properties as durability or strength. Knowledge of statistical distribution models allows to fix limits of acceptation or rejection, with criteria of frequencies, and dependence relationships among them. In order to propose distribution models for the percentage of Ignition Loss, Insoluble Residuum and SO3, the values of the variables on 255 samples analysed at the Instituto E. Torroja during 10 years, have been studied. Dependences among variables, defined by the correlation coefficients, have been studied as well. Sample values have been grouped in equally probable intervals and goodness of fit with Normal, Gamma and Log-Normal distributions was done by means of test X2. Finally, goodness of fit and agreement between upper fractals and maxima values in samples let us propose distribution models for each variable. Las limitaciones fijadas en las normas para las características químicas de los cementos han sido establecidas según métodos semi-empíricos, dada la complejidad de los fenómenos que influyen, sin que exista correspondencia entre estos valores y las propiedades físico-químicas y mecánicas como durabilidad y resistencia. El conocimiento de los modelos estadísticos de distribución de las características químicas permite establecer valores límites de aceptación o rechazo, según criterios frecuentistas, y las relaciones de dependencia existentes entre ellas. Con el fin de proponer modelos de distribución de los contenidos de Pérdida al Fuego, Residuo Insoluble y SO3 se ha hecho un estudio sobre los valores obtenidos de estas tres variables en análisis efectuados en el Instituto E. Torroja sobre 255 muestras de cemento durante 10 a os. Se han estudiado las dependencias existentes entre las tres variables, definidas por los coeficientes de correlación entre ellas. Los valores de las muestras se han agrupado en intervalos equiprobables y se ha aplicado el test X2 para, verificar la bondad de ajuste de las distribuciones Normal, Gamma y Log-Normal a cada una de ellas. Finalmente, la bondad de ajuste y la concordancia entre los valores de los fractiles más altos y los valores máximos encontrados en las muestras ha permitido proponer modelos de distribución para cada una de las variables.
Atypical symptoms of gastro-esophageal reflux during pregnancy Síntomas atípicos de reflujo gastroesofágico en el embarazo
Enrique Rey,Fernando Rodríguez-Artalejo,Miguel ángel Herraiz,ángel álvarez-Sánchez
Revista Espa?ola de Enfermedades Digestivas , 2011,
Abstract: Background: pregnancy is associated with an increased incidence of heartburn. However, there is no information for other symptoms related to gastro-esophageal reflux (GOR). Aim: to assess the prevalence of atypical symptoms of GOR during pregnancy, and to examine its association with typical GOR symptoms. Methods: we report data for 263 women with a pregnancy of less than 12 weeks. They were interviewed at the end of each trimester of pregnancy and at 1-year post-partum, using the Gastro Esophageal Reflux Questionnaire (GERQ). In the first interview, information about symptoms in the year before pregnancy was also collected with GERQ. Results: women suffered atypical GOR symptoms during pregnancy more frequently than in the year before: non-cardiac chest pain (NCCP) (9.1 vs. 1.9%), dysphagia (12.6 vs. 2.3%), globus (33.1 vs. 4.6%), cough (26.6 vs. 6.8%), belching (66.2 vs. 19.4%) and hiccups (19.0 vs. 8.4%). Atypical GOR symptoms in pregnancy showed an association with suffering the same symptom before pregnancy and NCCP, globus, belching and hiccups with suffering typical GOR symptoms in the first trimester. Conclusions: atypical GOR symptoms are highly prevalent in pregnancy, and are associated with atypical symptoms before pregnancy and with typical symptoms of GOR in the first trimester.
Statistical Tools Applied in the Characterisation and Evaluation of a Thermo-Hygrometric Corrective Action Carried out at the Noheda Archaeological Site (Noheda, Spain)
Miguel ángel Valero,Paloma Merello,ángel Fernández Navajas,Fernando-Juan García-Diego
Sensors , 2014, DOI: 10.3390/s140101665
Abstract: The Noheda archaeological site is unique and exceptional for its size, and the quality and conservation condition of the Roman mosaic pavement covering its urban pars. In 2008 a tent was installed as protection from rain and sun. Being of interest to characterise the microclimate of the remains, six probes with relative humidity and temperature sensors were installed in 2013 for this purpose. Microclimate monitoring allowed us to check relative humidity differences resulting from the groundwater level, as well as inner sensors reaching maximum temperatures higher than the outdoors ones as a consequence of the non-ventilated tent covering the archaeological site. Microclimatic conditions in the archaeological site were deemed detrimental for the conservation of the mosaics. Thus, in summer 2013, expanded clay and geotextile were installed over the mosaics as a corrective action. The outcomes of this study have proven the effectiveness of this solution to control temperature and relative humidity, helping to configure a more stable microclimate suitable for preservation of the mosaic.
ANáLISIS ULTRAESTRUCTURAL DE LA INTERACCIóN DE Xanthomonas axonopodis pv. phaseoli CON GENOTIPOS RESISTENTES, MODERADAMENTE RESISTENTES Y SUSCEPTIBLES DE Phaseolus vulgaris L
Nancy,Contreras; Trujillo,Gustavo; Borges,Orángel; Centeno,Fernando;
Interciencia , 2001,
Abstract: observations with the transmission electron microscope of transverse sections of leaves allowed to visualize the changes occurred at cellular level in the epidermis, mesophyll and vascular system, when the bacterium xanthomonas axonopodis pv. phaseoli (xapvph) was inoculated to susceptible, resistant and moderately resistant black bean genotypes (phaseolus vulgaris l.) 17 and 27 days after sowing. the samples were collected and processed at 14 and 21 days after leaf inoculation. the resistant genotype showed bacterial encapsulation. the moderately resistant ones had few bacteria in the intercellular spaces and vesicles between the plasmalemma and the cell wall. in the susceptible genotype, there was a higher number of bacteria in the intercellular spaces and there was a larger number of bacteria, cytoplasm condensation, organelles degeneration, broken half sheet and penetration in metaxylem vessels by bacterial masses. in later disease stages bacteria xapvph enter the vascular tissue.
BIOLOGíA DE Phyllophaga obsoleta BLANCHARD (COLEOPTERA: MELOLONTHIDAE): ESPECIE RIZóFAGA DEL COMPLEJO ?CHISA? DE COLOMBIA
Vallejo,Fernando; Morón,Miguel ángel; Orduz,Sergio;
Boletín Científico. Centro de Museos. Museo de Historia Natural , 2007,
Abstract: by means of life tables, the development stages that composed the life cycle of phyllophaga obsoleta blanchard were analyzed, which is part of the white grubs complex in colombia. consequently, its importance as an economic activity in colombia recognized. additionally, some aspects related to its phenology and distribution in the eastern part of the antioquia department (colombia) were analyzed, where it was found to be associated to agricultural and ornamental crops as well.
An ecophysiographic approach for Araucaria araucana regeneration management
Drake,Fernando; Molina,Juan Ramón; Herrera,Miguel ángel;
Ciencia e investigación agraria , 2012, DOI: 10.4067/S0718-16202012000100013
Abstract: chilean temperate forests are dominated by nothofagus and araucaria araucana species. despite a. araucana not being at imminent risk of extinction, its cultural value and the associated environmental services and landscape goods have an important role for the conservation of this native forest. in some areas, the future conservation of a. araucana is a cause of great concern given its management prohibition and regeneration limitation due to slow growth, canopy tree competition and dense understory. the above characteristics make this species most susceptible to some disturbances, such as livestock, wildlife and human pressures. therefore, sustainable management of a. araucana forests requires the assessment of its regeneration condition. the objective of this research was to apply multivariable analysis techniques in search of the most relevant parameter for araucaria regeneration. this study used the following methods: principal component analysis (pca), forward stepwise regression modeling and maxent modeling. by pca, it was possible to reduce the dimension to six-dimensional with a variance explanation of greater than 75%. the multivariable regression model, known as model 7, was the best compromise between the coefficient of determination and model size (number of independent variables). incorporating a maximum entropy trend improved model performance. a spatial prediction was obtained by summing the contributions of statistical methods and the geographic information system (gis). the gis increased the flexibility of the proposed model, which enabled an extrapolation to other areas at different spatial and temporal scales.
Oligodendrorhynchus hesperides gen. et sp. n. (Heteronemertea) from the Bellingshausen Sea
Fernando ángel Fernández-Alvarez, Nuria Anadón
Polish Polar Research , 2012, DOI: 10.2478/v10183-012-0006-3
Abstract: A new genus and species of heteronemertean from the Antarctic (Bellingshausen Sea), Oligodendrorhynchus hesperides, is described and illustrated. Some morphological features with major systematic significance are following: the mode of branching of the proboscis and its low number of terminal branches; the lack of horizontal lateral cephalic slits but in their place a pair of shallow epidermal depressions; a gelatinous amorphous connective stratum between the outer longitudinal and circular muscle layers; the presence of a rhynchocoelic nerve; isolated fibres of the rhynchocoel circular muscle layer interwoven with bundles of the adjacent body-wall inner longitudinal muscle fibres in the intestinal region. Other anatomical characters which can also be used to distinguish the new taxon from existing heteronemertean species that have a branched proboscis are also discussed.
El complejo mayor de histocompatibilidad humano: sistema HLA
Sara Claudia París ángel,Luis Fernando García
Iatreia , 1989,
Abstract: El complejo mayor de histocompatibilidad humano, o sistema HLA, está localizado en el brazo corto del cromosoma 6. Sus genes codifican tres tipos de moléculas. Los antígenos clase I (HLA-A, B, C y E) están formados por una cadena pesada unida no covalentemente a la β2-microglobulina y se expresan en la superficie de la mayoría de las células nucleadas del organismo. Estos antígenos actúan como elementos de restricción en la activación de los linfocitos T CD8+. Los antígenos clase II son dímeros compuestos por cadenas α y β y su distribución tisular está limitada sólo a algunos tipos de células. Estas moléculas actúan restringiendo la presentación de antígenos a los linfocitos CD4+. Los antígenos de clase III son proteínas plasmáticas del sistema del complemento. Los diferentes loci del sistema HLA son muy polimórficos y sus productos se heredan en bloques conocidos como haplotipos. Debido a que los diferentes grupos étnicos presentan variaciones en la frecuencia de ale ios y haplotipos, el HLA ha sido muy útil en los estudios antropogenéticos. Algunos antígenos HLA están presentes en pacientes con determinadas enfermedades con una frecuencia significativamente diferente a la encontrada en la población general. Estos hallazgos han sido de gran importancia para comprender la patogénesis y los mecanismos genéticos de resistencia o susceptibilidad a dichas enfermedades. En el campo de los transplantes de órganos, la compatibilidad HLA donante-receptor correlaciona con la sobrevida del injerto. El sistema HLA también parece tener mucha importancia en los fenómenos inmunológicos que ocurren durante el embarazo. Debido a la gran importancia teórica y práctica del sistema HLA en genética, inmunología y medicina en general, su estudio continuará siendo un campo muy activo de investigación básica y clínica. The human major histocompatibility complex or HLA system, located In the short arm of chromosome 6, Is the most Important genetic system in the regulation of the Immune response. The HLA genes code for 3 types of antigens which can be differentiated by their molecular structure, tissue distribution and function. Class I antigens (HLA-A, B, C and E) are composed by a heavy a chain bound to B2- microglobulin and are expressed by most nucleated cells. These molecules are the restriction elements for CD8+ T Iymphocyte activation. Class II antigens (HLA-DP, DQ and DR) are dimer formed by α and β chains. These antigens are present in the membrane of a limited type of cells and are responsible for the genetic restriction in the antigen presentation to CD4+ lymphocytes
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