973 resultados para C-60-GAMMA-CYCLODEXTRIN


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Resumir en un solo trabajo tanta historia como la pedagog??a de un colegio, el de San Antonio de Padua de C??ceres, que ha sabido ganar en cincuenta a??os la estima y la simpat??a de los cacere??os y que no est?? recopilada todav??a y pretende servir para el conocimiento y extensi??n de la cultura cacere??a. El Colegio San Antonio de Padua ha sabido mantenerse fiel a su inicial intenci??n de formar hombres cultos y de cristiana formaci??n. El Colegio San Antonio de Padua es una instituci??n importante para la historia de C??ceres, en el siglo XX, sin el cual ni puede hacerse un estudio serio del pensamiento cacere??o. Este colegio durante sus cincuenta a??os de existencia ha extendido y fomentado la cultura en C??ceres, sabiendo ganar la confianza de los cacere??os, que llevan sus hijos a dicho colegio para que se hagan hombres libres, ??tiles a la sociedad y educados en el temor de Dios. Actualmente, el influjo de los franciscanos del San Antonio es menor en el pensamiento de C??ceres, debido a la creaci??n de nuevos centros de ense??anza, pero estos religiosos siempre ser??n estimados y recordados con simpat??a y el Colegio de San Antonio de Padua siempre ser?? El San Antonio.

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Se cuenta la experiencia de una profesora de Educación Básica de Personas Adultas en el área de las Ciencias Sociales. Así, se constata que el elemento ante el que los adultos reaccionan con mayor motivación es el desafío. El perfil del alumno es muy heterogéneo: alumnos con responsabilidades laborales y familiares; alumnos mayores y jóvenes que comprenden que la única forma de promoción pasa por la obtención del título de Graduado en Secundaria; alumnos que fracasan en las enseñanzas de régimen general; y alumnos inmigrantes, con o sin titulación de su país de origen. La labor del docente consiste en diseñar unas líneas de actuación que ayuden a unificar al alumnado; extraer el máximo posible de su trabajo y de su experiencia personal; prepararles para el mundo laboral y, sobre todo, motivarles a seguir una línea de aprendizaje permanente que les ayude a reciclar sus conocimientos para adaptarlos a su trayectoria vital. El campo de las Ciencias Sociales se divide en cuatro áreas de trabajo: Geografía, Historia, Arte y Economía. En Geografía, se pretende que los alumnos aprendan a interpretar planos y mapas y que conozcan las herramientas de trabajo de los geógrafos; en Historia, se pretende que entren en contacto con la Historia Contemporánea, con especial atención a la historia reciente de España; en Arte, a través de la asignatura optativa Arte y vida, se introduce al alumnado en la interpretación y el disfrute de las obras de arte como Patrimonio de la Humanidad y contribución a su propia cultura artística; y en Economía, se introduce al alumnado en la comprensión del lenguaje económico y la interpretación de los datos estadísticos que suelen aparecer en los periódicos económicos. Se pretende que el alumnado interrelacione los contenidos de las distintas materias mediante el comentario de un recorte de prensa sobre un tema de actualidad durante los últimos quince minutos de cada sesión.

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Resumen tomado de la publicaci??n

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Este trabajo forma parte de un conjunto de actividades que, partiendo de una metodología activa, intenta desarrollar un currículum básico que abarque las Ciencias Naturales en el actual ciclo superior de EGB. Aquí se presentan 60 actividades relativas a los bloques temáticos: agua, aire y reacciones químicas, cuyo objetivo es facilitar al profesorado un cuadro de actividades suficientemente amplio para que éste lo aplique al desarrollo curricular concreto de su aula, seleccionando, de entre dichas actividades, aquellas que considere adecuadas.

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Se desarrolla el proyecto de una experiencia llevada a cabo en el instituto de Bachillerato Cardenal Herrera Oria, durante el curso 1977-1978. Esta experiencia se realiza con un grupo de alumnos de primero de BUP que optan por aprender francés como segundo idioma extranjero. Se exponen los objetivos, las etapas administrativas, la metodología y programación, actividades periescolares y evaluación y rendimiento.

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The spatial and temporal dynamics in the stream water NO3-N concentrations in a major European river-system, the Garonne (62,700 km(2)), are described and related to variations in climate, land management, and effluent point-sources using multivariate statistics. Building on this, the Hydrologiska Byrans Vattenbalansavdelning (HBV) rainfall-runoff model and the Integrated Catchment Model of Nitrogen (INCA-N) are applied to simulate the observed flow and N dynamics. This is done to help us to understand which factors and processes control the flow and N dynamics in different climate zones and to assess the relative inputs from diffuse and point sources across the catchment. This is the first application of the linked HBV and INCA-N models to a major European river system commensurate with the largest basins to be managed tinder the Water Framework Directive. The simulations suggest that in the lowlands, seasonal patterns in the stream water NO3-N concentrations emerge and are dominated by diffuse agricultural inputs, with an estimated 75% of the river load in the lowlands derived from arable farming. The results confirm earlier European catchment studies. Namely, current semi-distrubuted catchment-scale dynamic models, which integrate variations in land cover, climate, and a simple representation of the terrestrial and in-stream N cycle, are able to simulate seasonal NO3-N patterns at large spatial (> 300 km(2)) and temporal (>= monthly) scales using available national datasets.

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The spatial and temporal dynamics in the stream water NO3-N concentrations in a major European river-system, the Garonne (62,700 km(2)), are described and related to variations in climate, land management, and effluent point-sources using multivariate statistics. Building on this, the Hydrologiska Byrans Vattenbalansavdelning (HBV) rainfall-runoff model and the Integrated Catchment Model of Nitrogen (INCA-N) are applied to simulate the observed flow and N dynamics. This is done to help us to understand which factors and processes control the flow and N dynamics in different climate zones and to assess the relative inputs from diffuse and point sources across the catchment. This is the first application of the linked HBV and INCA-N models to a major European river system commensurate with the largest basins to be managed tinder the Water Framework Directive. The simulations suggest that in the lowlands, seasonal patterns in the stream water NO3-N concentrations emerge and are dominated by diffuse agricultural inputs, with an estimated 75% of the river load in the lowlands derived from arable farming. The results confirm earlier European catchment studies. Namely, current semi-distrubuted catchment-scale dynamic models, which integrate variations in land cover, climate, and a simple representation of the terrestrial and in-stream N cycle, are able to simulate seasonal NO3-N patterns at large spatial (> 300 km(2)) and temporal (>= monthly) scales using available national datasets.

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Lys-gamma 3-MSH is a melanocortin peptide derived from the C-terminal of the 16 kDa fragment of POMC. The physiological role of Lys-gamma 3-MSH is unclear, although it has previously been shown that, although not directly steroidogenic, it can act to potentiate the steroidogenic response of adrenal cortical cells to ACTH. This synergistic effect appears to be correlated with an ability to increase the activity of hormone sensitive lipase (HSL) and therefore the rate of cholesterol ester hydrolysis. Ligand binding studies have suggested that high-affinity binding sites for Lys-gamma 3-MSH exist in the adrenal gland and a number of other rat tissues that express HSL, including adipose, skeletal muscle and testes. To investigate the hypothesis that Lys-gamma 3-MSH may play a wider role in cholesterol and lipid metabolism, we tested the effect of Lys-gamma 3-MSH on lipolysis, an HSL-mediated process, in 3T3-L1 adipocytes. In comparison with other melanocortin peptides, Lys-gamma 3-MSH was found to be a potent stimulator of lipolysis. It was also able to phosphorylate HSL at key serine residues and stimulate the hyper-phosphorylation of perilipin A. The receptor through which the lipolytic actions of Lys-gamma 3-MSH are being mediated is not clear. Attempts to characterise this receptor suggest that either the pharmacology of the melanocortin receptor 5 in 3T3-L1 adipocytes is different from that described when expressed in heterologous systems or the possibility that a further, as yet uncharacterised, receptor exists.

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Alpha-, beta- and gamma-melanocyte stimulating hormones (MSHs) are peptides derived from the ACTH precursor, pro-opiomelanocortin. All three peptides have been highly conserved throughout evolution but their exact biological function in mammals is still largely obscure. In recent years, there has been a surge of interest in alpha-MSH and its role in the regulation of feeding. Gamma-MSH by contrast has been shown to be involved in the regulation of adrenal steroidogenesis and also has effects on the cardiovascular and renal systems. This review will provide an overview of the role that gamma-MSH peptides play in the regulation of adrenal steroidogenesis. (c) 2005 Elsevier Inc. All rights reserved.

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The DcuS-DcuR system of Escherichia coli is a two-component sensor-regulator that controls gene expression in response to external C-4-dicarboxylates and citrate. The DcuS protein is particularly interesting since it contains two PAS domains, namely a periplasmic C-4-dicarboxylate-sensing PAS domain (PASp) and a cytosolic PAS domain (PASc) of uncertain function. For a study of the role of the PASc domain, three different fragments of DcuS were overproduced and examined: they were PASc-kinase, PASc, and kinase. The two kinase-domain-containing fragments were autophosphorylated by [gamma-P-32]ATP. The rate was not affected by fumarate or succinate, supporting the role of the PASp domain in C-4-dicarboxylate sensing. Both of the phosphorylated DcuS constructs were able to rapidly pass their phosphoryl groups to DcuR, and after phosphorylation, DcuR dephosphorylated rapidly. No prosthetic group or significant quantity of metal was found associated with either of the PASc-containing proteins. The DNA-binding specificity of DcuR was studied by use of the pure protein. It was found to be converted from a monomer to a dimer upon acetylphosphate treatment, and native polyacrylamide gel electrophoresis suggested that it can oligomerize. DcuR specifically bound to the promoters of the three known DcuSR-regulated genes (dctA, dcuB, and frdA), with apparent K(D)s of 6 to 32 muM for untreated DcuR and less than or equal to1 to 2 muM for the acetylphosphate-treated form. The binding sites were located by DNase I footprinting, allowing a putative DcuR-binding motif [tandemly repeated (T/A)(A/T)(T/C)(A/T)AA sequences] to be identified. The DcuR-binding sites of the dcuB, dctA, and frdA genes were located 27, 94, and 86 bp, respectively, upstream of the corresponding +1 sites, and a new promoter was identified for dcuB that responds to DcuR.

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The pro-opiomelanocortin (POMC)-derived peptides, pro-gamma-MSH (16K fragment), and Lys-gamma(3)-MSH, have been shown to potentiate the steroidogenic action of corticotrophin (ACTH) on the adrenal cortex. Using a continuously perfused adrenal cell column system, we have tested the hypothesis that gamma-MSH peptides exert their effect through the Melanocortin 3 Receptor (MC3-R), since this is the only known receptor to have high affinity for gamma-MSH peptides and has been suggested to be expressed in the rat adrenal. To investigate this hypothesis we tested whether the MC3-R agonist MTII and antagonist SHU9119 could mimic or block the actions of pro-gamma-MSH. We found that MTII could not mimic, and SHU9119 could not block pro-gamma-MSH mediated potentiation of ACTH-induced steroidogenesis. These results suggest that the MC3-R is not involved in mediating the potentiation effect, adding further evidence to the argument that another melanocortin receptor exists.

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Essential and Molecular Dynamics (ED/MD) have been used to model the conformational changes of a protein implicated in a conformational disease-cataract, the largest cause of blindness in the world-after non-enzymic post-translational modification. Cyanate modification did not significantly alter flexibility, while the Schiff's base adduct produced a more flexible N-terminal domain, and intra-secondary structure regions, than either the cyanate adduct or the native structure. Glycation also increased linker flexibility and disrupted the charge network. A number of post-translational adducts showed structural disruption around Cys15 and increased linker flexibility; this may be important in subsequent protein aggregation. Our modelling results are in accord with experimental evidence, and show that ED/MD is a useful tool in modelling conformational changes in proteins implicated in disease processes. (C) 2003 Published by Elsevier Ltd.