Markers Chemicals
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Biologia reprodutiva de rainhas e machos de Tetragonisca angustula (Hymenoptera: Meliponini) / Reproductive biology of the queens and males of Tetragonisca angustula (Hymenoptera: Meliponini)
The stingless bees (Hymenoptera: Meliponini)present a haplodiploid sex determination system with complementary sex determination in a single locus. Such a system is a large genetic load for the group and thus the genetic diversity of male\ s aggregations near the nests is essential to minimize the chances of inbreeding. The interactions among the stingless b
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/08/2012
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2. Estudo de esteróis como marcadores químicos em águas destinadas ao abastecimento público na região do Rio Paraíba do Sul, SP. Desenvolvimento e validação de metodologia analítica / Study sterols as markers chemicals in water supply for the public in the region of the Paraíba do Sul River, SP. Development and validation of analytical methodology
Estudos recentes na região do rio Paraíba do Sul, SP, apontaram a presença de estrógenos e xenoestrógenos e em virtude deste contexto, identificou-se a necessidade de investigar determinados compostos representantes da classe dos esteróis, marcadores químicos mais utilizados em estudos sobre o aporte de esgotos em matrizes ambientais. A metodologia de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2012
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3. Comparison of a forward and a reverse mutation assay in Salmonella typhimurium measuring L-arabinose resistance and histidine prototrophy.
A forward and a reverse mutation assay designed to detect environmental mutagens have been compared in Salmonella typhimurium. The forward mutation assay scored resistance to L-arabinose and the reverse assay, reversion of histidine auxotrophy. Eighteen chemicals of different structural groups, all known to be mutagenic in the histidine reverse assay, were a
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4. Alterations in Bacillus subtilis transforming DNA induced by beta-propiolactone and 1,3-propane sultone, two mutagenic and carcinogenic alkylating agents.
Transforming DNA was exposed to either beta-propiolactone or 1,3-propane sultone and then used for transformation of competent bacteria to nutritional independence from tyrosine and tryptophan (linked markers) and leucine (an unlinked marker). The ability to transform was progressively lost by the DNA during incubation with either of these two chemicals. For
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5. Mutability of different genetic loci in mammalian cells by metabolically activated carcinogenic polycyclic hydrocarbons.
The relationship between carcinogenesis and mutagenesis in mammalian cells has been determined with 10 polycyclic hydrocarbons with different degrees of carcinogenicity. Mutagenesis was determined in Chinese hamster cells with genetic markers that affect the surface membrane, nucleic-acid synthesis, and protein synthesis. The mutations were characterized by
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6. Interaction of Chlamydia trachomatis Serovar L2 with the Host Autophagic Pathway
Chlamydiae are obligate intracellular pathogens that replicate within a membrane-bound compartment (the inclusion) and are associated with important human diseases, such as trachoma, pneumonia, and atherosclerosis. We have examined the interaction of the host autophagic pathway with Chlamydia trachomatis serovar L2 by using the specific autophagosomal stain
American Society for Microbiology.
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7. Characterization and expression of caffeoyl-coenzyme A 3-O-methyltransferase proposed for the induced resistance response of Vitis vinifera L.
Cell-suspension cultures of Vitis vinifera L. cv Pinot Noir accumulated resveratrol upon fungal elicitation, and the activity of S-adenosyl-L-methionine:trans-caffeoyl-coenzyme A 3-O-methyl-transferase (CCoAOMT), yielding feruloyl-CoA, increased to a transient maximum at 12 to 15 h. CCoAOMT cDNA was cloned from the elicited cells and was shown to encode a po