245 resultados para cholera


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It is recognised that cholera toxin (Ctx) is a significant cause of gastrointestinal disease globally, particularly in developing countries where access to uncontaminated drinking water is at a premium. Ctx vaccines are prohibitively expensive and only give short-term protection. Consequently, there is scope for the development of alternative control strategies or prophylactics. This may include the use of oligosaccharides as functional mimics for the cell-surface toxin receptor (GM I). Furthermore, the sialic acid component of epithelial receptors has already been shown to contribute significantly to the adhesion and pathogenesis of Ctx. Here, we demonstrate the total inhibition of Ctx using GM1-competitive ELISA with 25 mg mL(-1) of a commercial preparation of sialyloligosaccharides (SOS). The IC50 value was calculated as 5.21 mg mL(-1). One-hundred percent inhibition was also observed at all concentrations of Ctx-HRP tested with 500 ng mL(-1) GM1-OS. Whilst SOS has much lower affinity for Ctx than GM1-OS, the commercial preparation is impure containing only 33.6% carbohydrate; however, the biantennary nature of SOS appears to give a significant increase in potency over constituent monosaccahride residues. It is proposed that SOS could be used as a conventional food additive, such as in emulsifiers, stabilisers or sweeteners, and are classified as nondigestible oligosaccharides that pass into the small intestine, which is the site of Ctx pathogenesis. (C) 2008 Elsevier Ltd. All rights reserved.

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Cholera and other diarrheal diseases are the second leading cause of death among the poor globally. The tragedy of this statistic is that it need not be the case. Unlike many afflictions, the impact of cholera can be greatly reduced, if not eliminated, through the provision of clean water services. This begs the question of why such provision is absent in much of the world. It is our contention that the provision of clean water services is an increasing function of both a country's level of income and income equality. We test these hypotheses by analyzing 1,032 annual observations arising from 55 relatively poor countries between the years 1980 and 2002. In the primary part of the analysis, we find that providing clean water is, as predicted, an increasing function of income and equality. Following this, and consistent with the existing epidemiological research on cholera, we find that both the numbers of cases and deaths resulting from a given cholera outbreak are strongly and negatively related to the provision of clean water.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Bibliograph. Nachweis: Wolf, Sylvia: Politische Karikaturen in Deutschland 1848/49. Mittenwald 1982. – 1.21 Nr. 27

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von Adolf Jellinek

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Welsch (Projektbearbeiter): Kritische Kommentierung der in der Preußischen Nationalversammlung am 9. August 1848 geführten Debatte über die Berliner Konstabler-Schutztruppe. In der Form einer Unterhaltung zwischen den Berliner Bürgern Neumann, Piesecke und Brennecke

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S. W.

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u.a. Heinrich von Lowtzow alias Baron von Schöneberg;