917 resultados para Compuestos de Cloro


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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Ciências Biológicas (Microbiologia Aplicada) - IBRC

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Medicina Veterinária - FCAV

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Los ferrocarriles latinoamericanos o caribeños se dedican principalmente al transporte masivo, de pasajeros en las cercanías de las ciudades y de carga fuera de ellas. Los trenes no urbanos para pasajeros se acercaron a la extinción durante las últimas décadas del siglo 20, pero ahora, surgen nuevos mercados para trenes de pasajeros, de características distintas de los del pasado, la demanda de los cuales se deriva esencialmente del tren en sí mismo, o de los paisajes de la ruta por donde pasa, y no precisamente de un deseo de llegar a la estación de destino. Los nuevos trenes turísticos, compuestos frecuentemente de equipos históricos dignamente restaurados, son caros de operar y, por sus características especiales, no son fácilmente integrables con la operación de los servicios ferroviarios de transporte masivo. Sin embargo, en algunas circunstancias, pueden ser privadamente rentables, y otras se justificarían socialmente, por el impulso que son capaces de dar al desarrollo económico de las zonas, frecuentemente apartadas y relativamente deprimidas, donde suelen operar.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Incluye bibliografía.

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Multivariate image analysis applied to the quantitative structure-activity relationships (MIA-QSAR) is a 2D QSAR technique that has been presenting promising outcomes for the development of new drug candidates, due to its simplicity, rapidity and low cost. In this way, the present study aims at introducing, consolidating and improving the new dimensions named aug-MIA-QSAR and aug-MIA-QSARcolor, as well as applying them to the study of neglected diseases, in order to obtain new drug targets using chemico-biological interpretation of the MIA molecular descriptors. Four compound data sets with experimental bioactivities against Chagas disease, malaria, dengue and schistosomiasis were evaluated using three approaches: MIA-QSARt, aug-MIA-QSAR and aug-MIA-QSARcolor. In general, representations of atoms as spheres with different colors and sizes proportional to the corresponding van der Waals radii (aug-MIA approaches) improved the predictive ability and interpretability in all data sets. The use of colors proportional to the Pauling´s electronegativity showed that MIA descriptors are capable of identifying periodic properties relevant for the studied activity. Finally, solid colors instead of spotlighted atoms allowed a correct identification of atoms by means of pixel values in the studies for malaria, dengue and schistosomiasis, which were, subsequently, useful for the chemical interpretation related to the bioactivity. It can be inferred that semicarbazones and thiosemicarbazones derivative with a tri-substituted ring in R1 group and a trifluoro methyl group in the R 3 position instead of a chlorine antitripanossoma resulted in higher activity. The antimalarial activity of quinolon-4(1H)imines can be improved if: 1) R1 and R2 are electron donor groups, 2) R3 has long aminoalkyl chains, and 3) R4 possesses substituents with big atomic volume. In the study for dengue, it was found that tetrapeptides with unbranched small size amino acids in the A1 and A4 positions can increase the substrate affinity (Km) to the NS3 protein, and when in A1 and A2 positions, the substrate cleavage rate (kcat). On the other hand, acidic amino acids in the A2 and A4 positions were found to be related with low substrate affinity to the NS3 protein and when present in A1, with low substrate cleavage rate. Finally, the presence of metoxy substituents in R1 (or R2) and R5 in the neolignan backbone can favor their antischistosomal activity.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)