Vidrio : arena y fuego.

Programa emitido el 6 de marzo de 1996

Influencia de la refusion en las propiedades mecanicas y composicion quimica de aleaciones odontologicas

The objective of the study presented in this article was to analyze the influence of remelting of two odontological alloys: Dentorium and Steeldent, on the mechanical properties and on the chemical composition. For the two alloys, samples, containing 10% and 50% new alloy, were subjected to tensile test, micrography and chemical analysis. The alloys presented similar mechanical properties, except for the elongation, which presented higher values for the Dentorium 50% new alloy. This is due to the smaller carbides formed in this sample. The remelting itself seems not to be responsible for these differences, but they are probably due to the lack of a good control of the casting process. The micrography showed a dendritic column matrix, with carbides in the interdentric region and inside dendritic grain. In the chemical composition was observed few elements percentage change.

Mujer en el sector informal: las trabajadoras domiciliarias en la manufactura del calzado, Uruguay

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Alternativas para o tratamento da esquistossomose: Caracterizacao fisico-quimica do complexo de inclusao entre praziquantel e hidroxipropil-β-ciclodextrina

Praziquantel (PZQ) is the drug of choice commonly used for the treatment of shistosomiasis. However, it has low aqueous solubility, which could limit its bioavailability in the body. To circumvent these features, an inclusion complex with hydroxypropyl-beta- cyclodextrin (HP-β-CD) was prepared. Thus, the objective of this work was to prepare and characterize the PZQ/HP-β-CD inclusion complex. Morphological, spectroscopic, and calorimetric analysis showed the first signs of the guest/host interaction. The complexation kinetic analysis was used to determine the kinetic constant and, besides that, it was possible to establish the time consumed to reach equilibrium. Using the solubility isotherm, it was observed that the interaction with HP-β-CD increased 2.4 fold the aqueous solubility of plain PZQ. In vitro cytotoxicity tests, using fibroblast cells, evidenced no toxicity for these cells at the concentrations tested. These results demonstrated that there is a potential use of PZQ in formulations with HP-β-CD.

Cambio tecnológico en una empresa mexicana productora de máquinas para el vidrio y el plástico

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Heterogeneidad estructural y sus determinantes en la manufactura mexicana, 1994-2008

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Ahorro del bagazo para la manufactura del papel: consideraciones técnicas

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Industria del vidrio: cuadros comparativos de derechos arancelarios, gravámenes totales y equivalentes ad-valorem a la importación en los países centroamericanos

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Industria del vidrio: cuadros comparativos de cifras del comercio exterior, de los países centroamericanos

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Industria del vidrio: aforos uniformes acordados

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Estado actual de los recursos naturales del Istmo Centroamericano y su posible aplicación en la manufactura de materiales de construcción utilizables en la vivienda

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La manufactura mexicana, diagnóstico de su estructura y programas locales de apoyo : prácticas, logros y pendientes hacia una política industrial nacional

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