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81304 documents, page 1 of 8131

Ice nucleating activity of Pseudomonas syringae and Erwinia herbicola.

Chemical and biological properties of the ice nucleating sites of Pseudomonas syringae, strain C-9, and Erwinia herbicola have been characterized. The ice nucleating activity (INA) for both bacteria was unchanged in buffers ranging from pH 5.0 to 9.2, suggesting that there were no essential groups for which a change in charge in this range was critical. The INA of both bacteria was also unaffected by the addition of metal chelating compounds. Borate compounds and certain lectins markedly inhi...

Cytoplasmic RNA from normal and malignant human cells shows homology to the DNAs of Epstein-Barr virus and human adenoviruses.

Cytoplasmic RNA prepared from several human cell lines and tissues was hybridised to DNA from Epstein-Barr virus, human adenovirus types 2, 3 and 12 and human papovaviruses BK and JC. RNA from all the cells, regardless of whether or not they were virally infected, hybridised to specific regions of the Epstein-Barr virus or adenovirus genomes but not to papovavirus DNA. The cellular cross-hybridising species appear to be repetitive sequences which are conserved in higher eukaryotes. Mismatch e...

Production of monoclonal antibody against a glucosyltransferase of Streptococcus mutans 6715.

A mouse hybrid cell line secreted monoclonal antibody which reacted specifically with Streptococcus mutans 6715 (serotype g) glucosyltransferase (GTase)-synthesizing water-insoluble glucan and inhibited with enzyme reaction. The antibody was cross-reactive with GTase of serotype d but not with GTase of other serotypes of S. mutans when an enzyme-linked immunosorbent assay was used.


For induction of fat deposit in meat, hypothyroidism is the most important factor. This study was carried out to confirm the effect of glucocorticoid on thyroidal function, using rats. Triamcinolone acetonid, a synthetic compound was used as glucocorticoid. Rats of an experimental group were injected singly subcutaneously with 0.9 mg of the compound and another group of rats served as control. The animals were sacrificed by decapitating at 2 hours and 4 hours following the injection. At the ...

Saúde materno-infantil: visão crítica dos determinantes e dos programas assistenciais

Discute-se a determinação social da saúde materno-infantil nas Américas, a partir de inúmeras publicações e recomendações oficiais. Observou-se que nem todos os estudos valorizam apropriadamente as variáveis sociais e que muitos deles as consideram no mesmo nível de importância das variáveis biológicas. Como conseqüência, a compreensão final dos achados fica prejudicada e as conclusões e recomendações extraídas ficam longe de tocar a raiz dos problemas. Diferentes variáveis sociais (como esco...