982 resultados para Base excision repair


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Three optically active Schiff-base ligands have been prepared by condensation of 2-hydroxyacetophenone with (IR,2R)-(-)-1,2-diaminocyclohexane, (1S,2S)-(-)1,2-diphenylethylenediamine or R-(+)-2,2'-diamino-1,1'-binaphthalene, respectively. The products have been characterized by their IR, H-1- and C-13-NMR spectra.

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This report investigates some techinques appropriate to representing the knowledge necessary for understanding a class of electronic machines -- radio receivers. A computational performance model - WATSON - is presented. WATSONs task is to isolate failures in radio receivers whose principles of operation have been appropriately described in his knowledge base. The thesis of the report is that hierarchically organized representational structures are essential to the understanding of complex mechanisms. Such structures lead not only to descriptions of machine operation at many levels of detail, but also offer a powerful means of organizing "specialist" knowledge for the repair of machines when they are broken.

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Conceitos de qualidade de semente. Fatores que afetam a qualidade da semente de soja. Pureza genética. Qualidade fisiológica (vigor e geminação).Qualidade física. Qualidade sanitária. Resultados da utilização de sementes de alta qualidade.

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Bases de dados da pesquisa agropecuária. Indexação textual com o Lucene. Lucene. Lucene no sistema das bases de dados da pesquisa agropecuária. Comparação de desempenho infra-estrutura de hardware e software. Conjunto de consultas testes e resultados. Ponderações. Nova BDPA.