993 resultados para Fenton, Elisa
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Tesis (Maestría en Ciencias con Orientación en Química Analítica Ambiental) UANL, 2010.
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Tesis (Maestría en Ciencias con Orientación en Química Analítica Ambiental) UANL, 2011.
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Tesis (Maestría en Ciencias con acentuación en Microbiología) UANL, 2014.
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Tesis (Maestría en Ciencias con orientación en Química Analítica Ambiental) UANL, 2014.
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Tesis (Maestría en Ciencias con orientación en Química Analítica Ambiental) UANL, 2014.
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UANL
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This thesis Entitled Colour removal from dye house effluents using zero valent iron and fenton oxidation.Findings reported on kinetic profile during oxidation of dyes with Fenton’s reagent are in good agreement with observations of earlier workers on other organic substrates. This work goes a step further. Critical concentration of the dye at which the reaction mechanism undergoes transition has been identified.The oxidation of Reactive Yellow showed that the initial rates for decolorization increased linearly with an increase in hydrogen peroxide concentration over the range studied. Fenton oxidation of all dyes except Methylene Blue showed that the initial rates increased linearly with an in the ferrous sulphate concentration. This increase was observed only up to an optimum concentration beyond which further increase resulted in a decrease in the initial rates. Variation of initial rates with Ferrous sulphate concentration resulted in a linear plot passing through the origin indicating that the reaction is first order with respect to ferrous sulphate.
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Resumen basado en el de la autora
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En el universo urbano, confluye un sinnúmero de sentires, tradiciones y saberes de lo que significa habitar la ciudad latinoamericana. La literatura escrita por mujeres, en diálogo abierto con dichas expresiones nos da la posibilidad de explorar esos contenidos y reinterpretar la realidad. Es posible que sea necesario emular formas combativas y propuestas transformadoras de la realidad. En Colombia, la obra narrativa de Elisa Mújica nos permite indagar en el contexto espacio-temporal narrado, así como en las relaciones de poder establecidas en ciudades urbanas como Bogotá: la ciudad es el escenario donde mujer y ciudad son dos sujetos protagónicos que dialogan estrechamente y están asidos por la misma cuerda: el devenir. En la presente investigación, el lector hallará un recorrido por la recepción de la obra de Elisa Mújica, así como también por los diferentes lugares, espacios e imaginarios urbanos presentes en la novela, los que a su vez en diálogo con el mundo interior de su protagonista, posibilitarán el hallazgo de la concienciación y de los efectos que se deriven de ese encuentro. La investigación efectúa un análisis cultural, crítico y semiótico, que indaga en la relación establecida entre mujer y ciudad (Bogotá, años 1930-1980) y desde allí, plantea la urgente necesidad de asumir la concienciación en ese tiempo y espacio habitados. En este sentido, la concienciación constituye un fenómeno social cuestionador del imaginario social patriarcal y desde la literatura, (concretamente, desde la narrativa) en un intento por contribuir a la transformación de ese imaginario, se proponen nuevos tipos de relaciones de género.
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La presente investigación trata de los cambios de la Gestión Curricular en el Centro Infantil del Buen Vivir (CIBV) “Elisa Mariño de Carvajal” de la ciudad de Guaranda en los períodos 2011-2013. Para ello se ha elaborado cuatro capítulos con las siguientes temáticas: En el primer capítulo, se explica las características y fundamentos rectores del CIBV; en el segundo, se detallan los procesos de desarrollo de la primera infancia; el tercero contiene los instrumentos para la investigación; el cuarto capítulo se presenta los resultados obtenidos; y por último, está investigación pretende proponer un Plan de Mejora a la Gestión Curricular para que la Coordinadora, Educadoras y padres/madres de familia brinden una atención de calidad a las niñas/os de 1 a 3 años de edad. Este trabajo comprende un análisis profundo de la primera infancia, la cual debe ser protegida, estimulada y atendida de la mejor manera. Las niñas y niños de 0 a 3 años experimentan un proceso de cambios; biológicos, psicológicos y sociales, por ello es de vital importancia que los programas de atención a la primera infancia como los Centros Infantiles del Buen Vivir (CIBV), brinden las garantías necesarias para su óptimo desarrollo.
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Phenolic compounds in wastewaters are difficult to treat using the conventional biological techniques such as activated sludge processes because of their bio-toxic and recalcitrant properties and the high volumes released from various chemical, pharmaceutical and other industries. In the current work, a modified heterogeneous advanced Fenton process (AFP) is presented as a novel methodology for the treatment of phenolic wastewater. The modified AFP, which is a combination of hydrodynamic cavitation generated using a liquid whistle reactor and the AFP is a promising technology for wastewaters containing high organic content. The presence of hydrodynamic cavitation in the treatment scheme intensifies the Fenton process by generation of additional free radicals. Also, the turbulence produced during the hydrodynamic cavitation process increases the mass transfer rates as well as providing better contact between the pseudo-catalyst surfaces and the reactants. A multivariate design of experiments has been used to ascertain the influence of hydrogen peroxide dosage and iron catalyst loadings on the oxidation performance of the modified AFP. High er TOC removal rates were achieved with increased concentrations of hydrogen peroxide. In contrast, the effect of catalyst loadings was less important on the TOC removal rate under conditions used in this work although there is an optimum value of this parameter. The concentration of iron species in the reaction solution was measured at 105 min and its relationship with the catalyst loadings and hydrogen peroxide level is presented.
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Raised levels of chylomicrons and chylomicron remnants, which circulate following a meal, have been implicated in the development of atherosclerosis. Apolipoprotein (apo) B-48 is exclusively associated with chylomicron particles and provides a specific direct measurement of the number of intestinally derived lipoproteins in the circulation. The quantification of apo B-48 in biological samples is difficult due to the very low concentration in plasma, structural similarity to the N-terminal 48% of apo B-100 and lack of an appropriate standard for apo B-48. Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE), followed by coomassie blue staining, has been used for many years to measure apo B-48 levels in triacylglycerol (TAG)-rich lipoprotein samples. The raising of antiserum to apo B-48 has led to development of more sensitive and specific methods including immunoblotting and enzyme-linked immunosorbant assays (ELISAs). This has enabled direct measurement of apo B-48 in plasma without the need for separation into TAG-rich lipoproteins. A high degree of variability was observed in the apo B-48 concentrations reported in the literature both within and between the SDS-PAGE, immunoblotting and ELISA methods. (C) 2004 Elsevier Ireland Ltd. All rights reserved.
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We present a simple device for multiplex quantitative enzyme-linked immunosorbant assays (ELISA) made from a novel melt-extruded microcapillary film (MCF) containing a parallel array of 200µm capillaries along its length. To make ELISA devices different protein antigens or antibodies were immobilised inside individual microcapillaries within long reels of MCF extruded from fluorinated ethylene propylene (FEP). Short pieces of coated film were cut and interfaced with a pipette, allowing sequential uptake of samples and detection solutions into all capillaries from a reagent well. As well as being simple to produce, these FEP MCF devices have excellent light transmittance allowing direct optical interrogation of the capillaries for simple signal quantification. Proof of concept experiments demonstrate both quantitative and multiplex assays in FEP MCF devices using a standard direct ELISA procedure and read using a flatbed scanner. This new multiplex immunoassay platform should find applications ranging from lab detection to point-of-care and field diagnostics.