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Search Results: 1 - 10 of 581450 matches for " H. Ramírez A. "
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MAMíFEROS DE UN FRAGMENTO DE BOSQUE DE ROBLE EN EL DEPARTAMENTO DEL CAUCA, COLOMBIA
Ramírez,Héctor E; Pérez,Weimar A;
Boletín Científico. Centro de Museos. Museo de Historia Natural , 2007,
Abstract: twenty four mammal?s species belonging to 4 orders, 7 families, and 19 genera, are reported for an oak (quercus humboldtii) forest patch in the vereda ?la viuda?, cajibío, cauca department. bats and rodents were the orders with the biggest number of species. several registration techniques were used as mist nets, sherman and tomahawk traps, observations and signs. we reported an endemic rodent of colombia; a threatened species and the increase of the altitudinal range in colombia for phyllostomus discolor.
Location matters: the endoplasmic reticulum and protein trafficking in dendrites
Ramírez,Omar A; H?rtel,Steffen; Couve,Andrés;
Biological Research , 2011, DOI: 10.4067/S0716-97602011000100003
Abstract: neurons are highly polarized, but the trafficking mechanisms that operate in these cells and the topological organization of their secretory organelles are still poorly understood. particularly incipient is our knowledge of the role of the neuronal endoplasmic reticulum. here we review the current understanding of the endoplasmic reticulum in neurons, its structure, composition, dendritic distribution and dynamics. we also focus on the trafficking of proteins through the dendritic endoplasmic reticulum, emphasizing the relevance of transport, retention, assembly of multi-subunit protein complexes and export. we additionally discuss the roles of the dendritic endoplasmic reticulum in synaptic plasticity.
Atresia de Esófago y sus Asociaciones Preferenciales[title] [title language="en"]Esophageal atresia and related malformations
NAZER H,JULIO; RAMíREZ,CONSTANZA; CIFUENTES O,LUCíA;
Revista chilena de pediatría , 2011, DOI: 10.4067/S0370-41062011000100005
Abstract: esophageal atresia is a congenital malformation incompatible with life. the incidence is quite variable in chile and all over the world. objective: to estimate the prevalence at birth of esophageal atresia, comparing with previously published data. patients and methods: all children with congenital anomalies born at the universityofchile clinical hospital from 1999 to 2009 were included. results: 19.312 births during the study period were registered, 1710 of them had a congenital anomaly (8,9 %). fifteen of the malformed newborns had esophageal atresia (7.8 x 10.000): one stillbirth and 14 alive newborns. 78,6% of cases were discharge alive from the hospital, 3 (21,4 %) died during the hospitalization. only 1/15 was an isolated esophageal atresia, 6 cases were syndromic and 9 were classified as vacterl association. prenatal diagnosis was made in 73,3 % of the cases. newborns with esophageal atresia had significantly less birth weight, less gestational age and more malformed relatives, than control newborns. metrorrhagia during pregnancy in mothers was more frequent in cases than controls. no difference in maternal age between groups was founded. conclusion: the esophageal atresia prevalence at birth was higher than previously reported local data, and lower than the rest of eclamc data; this could be explained because the university of chile clinical hospital is a reference hospital for prenatal diagnosed cases.
Dinámica de osciladores acoplados por radiación
Rivera-Ramírez, H;Parravano, A;Cosenza, M. G.;
Revista mexicana de física , 2006,
Abstract: a system of electronic oscillators was designed to study experimentally the emergence of self-organization when the radiation acts as the mechanism of interacction between the oscilators. the experimental array consists of a set of pulsed leds (light emision diodes) and photo-resistors. the distance between the oscillating elements can be varied in order to modify the degree of coupling among them. the system is not completely homogeneous due to existing differences among the different electronic components of each oscillator. the occurrence of out of phase synchronization and the formation of spatiotemporal patterns are observed in this system.
Sobrevida, viabilidad y pronóstico del prematuro
Hübner G,María Eugenia; Ramírez F,Rodrigo;
Revista médica de Chile , 2002, DOI: 10.4067/S0034-98872002000800015
Abstract: an heterogeneous group of newborns with different gestational ages, birth weight, nutritional status and different risks of morbidity and mortality are classified as premature. therefore the definition of premature children subgroups is mandatory. very low weight premature babies are those with a birth weight of less than 1500 g. in chile, they correspond to 0.9% of newborns and they contribute to neonatal mortality with 50 to 70% and to infantile mortality, with 25 to 30%. survival of extremely premature babies has improved significantly in the last decades, due to a better perinatal care, the appearance of neonatal intensive care units, the routine use of mechanical ventilation, the perinatal use of steroids and the introduction of exogenous surfactant. however, survival varies considerably according to the place of birth, birth weight and gestational age and may be associated with different degrees of physical and mental disability. the imminent birth of a child in the limit of viability will require complex and difficult ethical decisions. there is consensus that the limit of viability is 23 weeks and that it fluctuates between 24 and 26 weeks in different parts of the world (rev méd chile 2002; 130: 931-8)
Location matters: the endoplasmic reticulum and protein trafficking in dendrites
Omar A Ramírez,Steffen H?rtel,Andrés Couve
Biological Research , 2011,
Abstract: Neurons are highly polarized, but the trafficking mechanisms that operate in these cells and the topological organization of their secretory organelles are still poorly understood. Particularly incipient is our knowledge of the role of the neuronal endoplasmic reticulum. Here we review the current understanding of the endoplasmic reticulum in neurons, its structure, composition, dendritic distribution and dynamics. We also focus on the trafficking of proteins through the dendritic endoplasmic reticulum, emphasizing the relevance of transport, retention, assembly of multi-subunit protein complexes and export. We additionally discuss the roles of the dendritic endoplasmic reticulum in synaptic plasticity.
Atresia de Esófago y sus Asociaciones Preferenciales[title] [title language="en"]Esophageal atresia and related malformations
JULIO NAZER H,CONSTANZA RAMíREZ,LUCíA CIFUENTES O
Revista chilena de pediatría , 2011,
Abstract: Introducción: Atresia de esófago es una malformación congénita incompatible con la vida, que tiene una frecuencia variable en Chile y en el resto del mundo. Objetivos: Presentar la prevalencia actual y compararla con comunicaciones anteriores. Estudiar las asociaciones más frecuentes con otras malformaciones y la sobreviva al alta hospitalaria. Pacientes y Método: Ingresaron a este trabajo todos los ni os que presentaban una o más malformaciones nacidos entre 1999 y 2009 nacidos en la maternidad del Hospital Clínico. Resultados: Durante el período ocurrieron 19 312 nacimientos. Se encontró 1. 710 recién nacidos malformados (8,9%). A 15 de ellos (7,8 por 10 000) se les diagnosticó Atresia de esófago. Catorce eran nacidos vivos. 78,6% fueron tratados y dados de alta vivos. Tres (21,4%) fallecieron. Sólo 1 caso fue catalogado como forma aislada, 6 como formas sindrómicas. Nueve casos fueron catalogados como Asociación VACTERL. En 73,3% de los casos se hizo el diagnóstico prenatal de la Atresia de esófago. Cuando se los comparó con los Controles, los malformados tenían un significativo menor peso de nacimiento y edad gestacional. No se encontró diferencia significativa en edad materna entre casos y controles. Sí había diferencia significativa en "otros malformados en la familia" y "metrorragia del primer trimestre" que eran más frecuentes en casos. Conclusión: La tasa de prevalencia al nacimiento fue mayor que la encontrada anteriormente y menor que el promedio dado por ECLAMC para Latinoamérica, probablemente debido a que el Hospital Clínico es un hospital de referencia de casos diagnosticados prenatalmente. Esophageal atresia is a congenital malformation incompatible with life. The incidence is quite variable in Chile and all over the world. Objective: To estimate the prevalence at birth of esophageal atresia, comparing with previously published data. Patients and Methods: All children with congenital anomalies born at the UniversityofChile Clinical Hospital from 1999 to 2009 were included. Results: 19.312 births during the study period were registered, 1710 of them had a congenital anomaly (8,9 %). Fifteen of the malformed newborns had esophageal atresia (7.8 x 10.000): one stillbirth and 14 alive newborns. 78,6% of cases were discharge alive from the hospital, 3 (21,4 %) died during the hospitalization. Only 1/15 was an isolated esophageal atresia, 6 cases were syndromic and 9 were classified as VACTERL association. Prenatal diagnosis was made in 73,3 % of the cases. Newborns with esophageal atresia had significantly less birth weight, less gestational
Sobrevida, viabilidad y pronóstico del prematuro Survival, viability and prognosis of preterm infants
María Eugenia Hübner G,Rodrigo Ramírez F
Revista médica de Chile , 2002,
Abstract: An heterogeneous group of newborns with different gestational ages, birth weight, nutritional status and different risks of morbidity and mortality are classified as premature. Therefore the definition of premature children subgroups is mandatory. Very low weight premature babies are those with a birth weight of less than 1500 g. In Chile, they correspond to 0.9% of newborns and they contribute to neonatal mortality with 50 to 70% and to infantile mortality, with 25 to 30%. Survival of extremely premature babies has improved significantly in the last decades, due to a better perinatal care, the appearance of neonatal intensive care units, the routine use of mechanical ventilation, the perinatal use of steroids and the introduction of exogenous surfactant. However, survival varies considerably according to the place of birth, birth weight and gestational age and may be associated with different degrees of physical and mental disability. The imminent birth of a child in the limit of viability will require complex and difficult ethical decisions. There is consensus that the limit of viability is 23 weeks and that it fluctuates between 24 and 26 weeks in different parts of the world (Rev Méd Chile 2002; 130: 931-8)
Dinámica de osciladores acoplados por radiación
H. Rivera-Ramírez,A. Parravano,M. G. Cosenza
Revista mexicana de física , 2006,
Abstract: Se dise ó y construyó un sistema electrónico de osciladores luminosos para estudiar experimentalmente el surgimiento de auto-organización cuando la radiación actúa como mecanismo de acoplamiento entre los osciladores. El montaje experimental consiste en un conjunto de LEDs (diodos emisores de luz) pulsados y fotorresistencias. La distancia entre los elementos osciladores puede variarse para modificar el grado de acoplamiento entre ellos. El sistema es heterogéneo debido a las diferencias existentes entre los distintos componentes electrónicos de cada oscilador. Se observó la ocurrencia de fenómenos de sincronización y formación de patrones espacio-temporales en este sistema.
Observed and Future Changes in the Temperature of the State of Jalisco, México Using Climdex and PRECIS  [PDF]
H. U. Ramírez-Sánchez, M. E. García Guadalupe, H. H. Ulloa-Godínez, A. R. Meulenert-Pe?a, F. O. García-Concepción, J. Alcalá Gutiérrez
American Journal of Climate Change (AJCC) , 2016, DOI: 10.4236/ajcc.2016.51006
Abstract: In the present study we analyzed the average and extreme temperatures observed and simulated by regional models in the State of Jalisco, Mexico. Data of daily mean, minimum and maximum temperatures of 208 stations distributed all over the State during the period 1971-2000 have been used to study the observed changes in the values of average and extreme temperatures. In addition, an assessment of future scenarios for the average and extreme temperatures associated with the increase in the concentration of greenhouse gases (GHG) was performed using simulations of a PRECIS (Providing Regional Climate for Impact Studies) regional climate modeling to create the climate for present (1971-2000), and future projections for the years 2020, 2050 and 2080. Observational analysis of the 208 stations suggests warming through increased intensity and frequency of hot events, with a decrease in the frequency of cold events. More than 35% to 76% of the stations have a tendency to a decrease in the number of cold events and 39% to 64% of the stations show a growing trend in the hot events. The percentage of stations showing warming through the indices of intensity of the highest maximums, lowest minimum temperatures is 37% to 70% and 30% to 65% of the stations, respectively. Observational analysis for the State of Jalisco as a whole also shows similar results. Anomalies in the average and extreme temperatures per month during the data period show an increase (decrease) in the frequency of hot (cold) events for every month. In general, PRECIS simulations under both scenarios A1B and A2 indicate an increase in warm events and decrease of cold extreme events towards the end of the 21st century. Both show similar patterns, but the scenario A2 shows slightly lower magnitudes of projected changes. Temperatures are likely to increase all year, but it is expected that changes in summer will be more prominent.
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