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Search Results: 1 - 10 of 295053 matches for " Agustín;Casta?o "
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Estimación de áreas ocupadas por cultivos de invierno en Uruguay utilizando teledetección
Giménez, Agustín;Castao, José Pedro;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: one of the most important factors of risk in agricultural production consists of adverse climate events (droughts, floods, ground frost, etc.), related to climate change and variability. a modern "adaptation" approach for coping with adverse climate events is to develop and implement anticipatory actions commonly named "risk management" strategies. to develop this kind of strategies, reliable and updated information on land use, location of agricultural areas, and crop status monitoring is crucial. the aim of this work was to explore the use of landsat satellite images to locate and estimate winter field crop areas in the livestock agriculture production region of uruguay. the study area was composed of the departments of colonia, soriano and río negro. to estimate the surface occupied by winter field crops, six landsat 5 tm images were processed, using the erdas imagine software, running the "supervised classification" method, and modeling multi temporal analyses. the estimation based on satellite image processing largely showed the results of the national agricultural census for the year 2000. these results lead to conclude that the use of remote sensing with satellite images is a tool of great potential and use for mapping and monitoring land use in uruguay, contributing to the preservation of natural resources and ecosystems.
Estimación de áreas ocupadas por cultivos de invierno en Uruguay utilizando teledetección Estimation of areas occupied by winter field crops in Uruguay using remote sensing
Agustín Giménez,José Pedro Castao
Revista mexicana de ciencias agrícolas , 2012,
Abstract: Una de las circunstancias incontrolables y de mayor riesgo a las que se enfrenta el sector agropecuario la constituyen los eventos climáticos adversos (sequías, excesos hídricos, heladas, etc.) resultantes del cambio climático y la variabilidad. Un enfoque moderno de adaptación para enfrentar circunstancias climáticas adversas consiste en la formulación e implementación de medidas anticipatorias comúnmente denominadas estrategias de "gestión de riesgos". Para el desarrollo de tales medidas es un requisito básico el disponer de información confiable y frecuentemente actualizada del uso actual de la tierra, ubicación de los distintos rubros de producción y monitoreo frecuente de estas y otras variables. El objetivo del trabajo fue explorar la utilización de imágenes de satélites Landsat para ubicar y estimar áreas ocupadas por cultivos de invierno en la región de producción agrícola ganadera de Uruguay comprendida en los departamentos de Colonia, Soriano y Río Negro. Para realizar la estimación de la superficie ocupada por cultivos de invierno se utilizaron seis imágenes capturadas por el satélite Landsat 5 TM a las que se le practicaron clasificaciones supervisadas y posteriormente se aplicaron modelos para realizar un análisis multi-temporal del área de estudio, utilizando el software ERDAS Imagine. La estimación realizada en base al procesamiento de las imágenes de satélite reflejó en gran medida los resultados del Censo General Agropecuario del a o 2000. Estos resultados permiten concluir que la utilización de la percepción remota con imágenes de satélite se presenta como una herramienta de gran potencial y utilidad para la determinación de áreas cultivadas, así como para el mapeo y monitoreo del uso de la tierra en Uruguay, contribuyendo a la preservación de los recursos naturales y los ecosistemas. One of the most important factors of risk in agricultural production consists of adverse climate events (droughts, floods, ground frost, etc.), related to climate change and variability. A modern "adaptation" approach for coping with adverse climate events is to develop and implement anticipatory actions commonly named "risk management" strategies. To develop this kind of strategies, reliable and updated information on land use, location of agricultural areas, and crop status monitoring is crucial. The aim of this work was to explore the use of Landsat satellite images to locate and estimate winter field crop areas in the livestock agriculture production region of Uruguay. The study area was composed of the Departments of Colonia, Soriano and Río Negro. T
Tabaco de liar: una prioridad de salud pública y consumo
Castao Calduch,Tania; Hebert Jiménez,Céline; San Segundo,M.a Teresa Campo; Ysa Valle,Miguel; Carlos-Roca,Agustín Pons;
Gaceta Sanitaria , 2012, DOI: 10.1016/j.gaceta.2011.09.010
Abstract: objectives: to study whether fine-cut tobacco poses a problem for public health and consumer affairs. methods: we analyzed up to 70% of the fine-cut tobacco market in spain. regarding public health, the contents of nicotine, tar and carbon monoxide were analyzed and compared with levels in conventional cigarettes. concerning consumer affairs, the labeling of samples was checked. results: the contents of nicotine, tar and carbon monoxide reached values of 70%, 85% and 84%, respectively. these values are higher than those allowed in conventional cigarettes. a total of 67% of the samples analyzed did not show nicotine and tar contents on the labeling. none of the labels showed carbon monoxide contents. the presence of labeling per se did not guarantee sufficient information for consumers. conclusions fine-cut tobacco is a problem in both public health and consumer affairs. solutions are required to resolve both problems.
Comprehensive analysis of RET common and rare variants in a series of Spanish Hirschsprung patients confirms a synergistic effect of both kinds of events
Rocio Nú?ez-Torres, Raquel M Fernández, Manuel Acosta, Maria del Valle Enguix-Riego, Martina Marbá, Juan Carlos de Agustín, Luis Castao, Guillermo Anti?olo, Salud Borrego
BMC Medical Genetics , 2011, DOI: 10.1186/1471-2350-12-138
Abstract: RET mutational screening was performed by dHPLC and direct sequencing for the identification of RVs. In addition Taqman technology was applied for the genotyping of 3 RET CVs previously associated to HSCR, including a variant lying in an enhancer domain within RET intron 1 (rs2435357). Statistical analyses were performed using the SPSS v.17.0 to analyze the distribution of the variants.Our results confirm the strongest association to HSCR for the "enhancer" variant, and demonstrate a significantly higher impact of it in male versus female patients. Integration of the RET RVs and CVs analysis showed that in 91.66% of cases with both kinds of mutational events, the enhancer allele is in trans with the allele bearing the RET RV.A gender effect exists on both the transmission and distribution of rare coding and common HSCR causing mutations. In addition, these RET CVs and RVs seem to act in a synergistic way leading to HSCR phenotype.Hirschsprung disease (HSCR, OMIM #142623) is a congenital malformation of the hindgut produced by a disruption in the neural crest cells (NCC) migration during embryonic development. This disorder results in an absence of intramural ganglion cells in the submucosal and myenteric plexuses producing a functional intestinal obstruction. According to the aganglionic segment length, patients could be classified as short-segment HSCR (S-HSCR), when aganglionosis extend as far as the rectosigmoid junction, and long-segment HSCR (L-HSCR), when it extends beyond it. HSCR presents an estimated incidence of 1/5000 live births with sex-dependent penetrance and male predominance of 4:1 [1,2]. It most commonly presents sporadically, although it can also be familial (up to 20% of the cases). The disease usually presents as isolated, though 30% of the cases are associated with chromosomal abnormalities, neurodevelopmental disorders and a variety of additional isolated anomalies and syndromes [2].HSCR has a complex genetic etiology with several genes being
Hypertension effects on p73 expression in the rat circumventricular organs and cerebrospinal fluid  [PDF]
Emilia M. Carmona-Calero, Ibrahim González-Marrero, Manuela Casta?eyra-Martin, Juan M. González-Toledo, Leandro Casta?eyra-Ruiz, Héctor de Paz-Carmona, Agustín Casta?eyra-Ruiz, Lidia Ruiz-Mayor, Agustín Casta?eyra-Perdomo
World Journal of Neuroscience (WJNS) , 2012, DOI: 10.4236/wjns.2012.22010
Abstract: It has been reported that spontaneously hypertensive rats (SHR) show ventricular dilation, changes in CSF proteins and variations in the circumventricular organs (CVO) such as: the subcommissural organ (SCO), the subfornical organ (SFO) and the area postrema (AP) which are located in the walls of the third and fourth ventricles. On the other hand, p73 proteins are present in cells of the central nervous system (CNS) such as circumventricular structures and the neuroepithelium which are altered in ventricular dilation. The purpose of the present work is to study the TAp73 isoform expression in the circumventricular organs (CVO) and their variations in ventricular dilatation and arterial hypertension. Brains and cerebrospinal fluid (CSF) from control Wistar-Kyoto rats (WKY) and SHR were used. The paraffin sections containing the CVO were immunohistochemically proc-essed with anti-TAp73 and by western blot, p73 bands in the CSF and circumventricular organ extract were also identified. The western blot study showed bands marked with p73 in the CSF and CVO, the p73 band expression was bigger in the SHR than in the WKY rats. We also found stronger markings in the SFO, SCO and AP of the hypertensive rats than in the WKY rats. It could be concluded that hypertension in the SHR produces altera-tions in the relationship between the p73 protein, circumventricular structures and CSF.
High Blood Pressure Effects on the Brain Barriers and Choroid Plexus Secretion  [PDF]
Ibrahim González-Marrero, Leandro Casta?eyra-Ruiz, Juan M. González-Toledo, Agustín Casta?eyra-Ruiz, Héctor de Paz-Carmona, Lidia Ruiz-Mayor, Agustín Casta?eyra-Perdomo, Emilia M. Carmona-Calero
Neuroscience & Medicine (NM) , 2012, DOI: 10.4236/nm.2012.31009
Abstract: High blood pressure produces ventricular dilation, variations in circumventricular organs and changes in the cerebrospinal fluid compositions. On the other hand, chronic hypertension in spontaneously hypertensive rats can cause changes in the integrity of the brain barriers: blood-cerebrospinal fluid barrier and blood brain barrier. The permeability of the brain barriers can be studied by using transthyretin and S-100β. In the present work we study the integrity of the brain barrier and the choroid plexus function variations in arterial hypertension. Control rats and spontaneously hypertensive rats were used and the choroid plexus were processed by immunohistochemistry with anti-transthyretin and anti-vasopressin. Western blot was also performed in cerebrospinal fluid, serum and choroid plexus using anti-S-100β, anti-transthyretin. The accumulation of transthyretin immunoreactive was bigger in spontaneously hypertensive rats with respect to the control. Vasopressin was also higher in spontaneously hypertensive rats with respect to the control. Western blot showed that transthyretin tetramer was higher in the spontaneously hypertensive rats than in the control rats. The expression of transthyretin monomer was lower in hypertensive rats than the control in the cerebrospinal fluid, the transthyretin monomer reaction in the blood was stronger in hypertensive than in control rats. Western blot for the S-100 β showed an increase in blood and cerebrospinal fluid of hypertensive rats. The high blood pressure produces a disruption of the blood brain barrier and blood to cerebrospinal fluid barrier that allows extravasations from the cerebrospinal fluid to the blood and from the blood to the cerebrospinal fluid.
The confined two-dimensional hydrogen atom in the linear variational approach
N. Aquino,E. Castao
Revista mexicana de física , 2005,
Abstract: En este trabajo analizamos el problema de un átomo de hidrógeno bidimensional confinado al interior de una región circular de paredes impenetrables. Estudiamos los efectos de tama o sobre los valores propios de la energía como función del radio del círculo. Usamos el método variacional lineal con la base de la partícula libre en un círculo. Comparamos nuestros resultados con los obtenidos mediante la teoría de perturbaciones y el método Rayleigh-Ritz que habían sido reportados previamente.
Dyslipidaemia in HIV-infected women on antiretroviral therapy. Analysis of 922 patients from the Spanish VACH cohort
Vicente Estrada, Paloma Geijo, Manuel Fuentes-Ferrer, María Alcalde, María Rodrigo, María Galindo, Agustín Mu?oz, Pere Domingo, Esteve Ribera, Jaime Cosín, Pompeyo Viciana, Fernando Lozano, Alberto Terrón, Antonio Vergara, Ramón Teira, Josefa Mu?oz-Sánchez, Bernardino Roca, Trinitario Sánchez, José López-Aldeguer, Elisabeth Deig, Francisco Vidal, Enric Pedrol, Manuel Castao-Carracedo, Teresa Puig, Myriam Garrido, Ignacio Suárez-Lozano
BMC Women's Health , 2011, DOI: 10.1186/1472-6874-11-36
Abstract: Observational, multicentre, cross-sectional study from the Spanish VACH Cohort. 922 women on stable ART without lipid-lowering treatment were included.Median age was 42 years, median CD4 lymphocyte count was 544 cells/mm3, and 85.6% presented undetectable HIV-1 viral load. Median total cholesterol (TC) was 189 mg/dL (interquartile range, IQR, 165-221), HDL cholesterol 53 mg/dL (IQR, 44-64), LDL cholesterol 108 mg/dL (IQR, 86-134), and triglycerides 116 mg/dL (IQR, 85-163). Mean accumulated time on ART was 116 months; 47.4% were on NNRTI-based regimes, 44.7% on PI, and 6.7% on only-NRTI therapy. 43.8% were also hepatitis C (HCV) coinfected. Patients on PI treatment presented higher TC/HDL ratio than those on NNRTI (p < 0.001). Significantly higher HDL values were observed in NNRTI-treated patients. HCV-coinfected patients presented lower TC/HDL ratio than the non HCV-coinfected. In multivariate analysis, factors independently associated with TC/HDL ratio were age, triglyceride levels and HCV co-infection. PI treatment presented a non-significant association with higher TC/HDL ratio.In HIV-infected women, the NNRTI-based ART is associated with a better lipid profile than the PI-based. Factors unrelated to ART selection may also exert an independent, significant influence on lipids; in particular, age, and triglyceride levels are associated with an increased TC/HDL ratio while HCV co-infection is associated with a reduced TC/HDL ratio.The increase in cardiovascular risk (CVR) observed in HIV-infected patients is a cause for concern. Most clinical studies have detected a relationship between cardiovascular disease and traditional risk factors, among which age, male gender, smoking, hypertension and diabetes are the most important. There is far less information concerning CVR in HIV-infected female patients. For years, some inequalities in female participation in clinical studies have been observed. In HIV infection, women have been under-represented as participants as t
Rol de la medicina popular a nivel rural: una experiencia en La Banda, Tafí del Valle.
Fernández Salda?o,Agustín I.;
Revista Costarricense de Salud Pública , 2006,
Abstract: en este trabajo pretendemos conocer la presencia y el rol de la medicina popular en una población previamente acotada. ubicamos a la medicina popular dentro del contexto mayor de la cultura popular y, desde allí, indagamos acerca de los contenidos religiosos que supone y el perfil laboral y educativo que contextualiza su práctica. tratamos de esclarecer por un lado, la opinión que la comunidad tiene acerca de la articulación entre esta medicina y el sistema de salud y, por otro, cuál es el potencial que esta medicina y la medicina científica tienen para resolver ciertos problemas de salud y, en el caso de un trabajo conjunto, nos preguntamos cuál sería el impacto en términos de salud en poblaciones como la estudiada. para lograr un estudio riguroso y confiable se tuvieron en cuenta ciertas variables como: población infantil, inestabilidad /estabilidad económica y nivel educativo para lo que se realizó, con una encuesta cerrada sobre 73 familias de la localidad de la banda -tafí del valle, durante julio del 2004, un estudio descriptivo de corte transversal, que arrojó interesantes resultados cuantitativos y cualitativos.
Rol de la medicina popular a nivel rural: una experiencia en La Banda, Tafí del Valle.
Agustín I. Fernández Salda?o
Revista Costarricense de Salud Pública , 2006,
Abstract: En este trabajo pretendemos conocer la presencia y el rol de la medicina popular en una población previamente acotada. Ubicamos a la medicina popular dentro del contexto mayor de la cultura popular y, desde allí, indagamos acerca de los contenidos religiosos que supone y el perfil laboral y educativo que contextualiza su práctica. Tratamos de esclarecer por un lado, la opinión que la comunidad tiene acerca de la articulación entre esta medicina y el sistema de salud y, por otro, cuál es el potencial que esta medicina y la medicina científica tienen para resolver ciertos problemas de salud y, en el caso de un trabajo conjunto, nos preguntamos cuál sería el impacto en términos de salud en poblaciones como la estudiada. Para lograr un estudio riguroso y confiable se tuvieron en cuenta ciertas variables como: población infantil, inestabilidad /estabilidad económica y nivel educativo para lo que se realizó, con una encuesta cerrada sobre 73 familias de la localidad de La Banda -Tafí del Valle, durante julio del 2004, un estudio descriptivo de corte transversal, que arrojó interesantes resultados cuantitativos y cualitativos.
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