Natural Gamma Ray
Mostrando 13-18 de 18 artigos, teses e dissertações.
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13. Estudo da resposta de cristais de quartzo natural para dosimetria termoluminescente
In the last few years, a number of studies have been carried out with the objective of characterizing and/or developing materials with thermoluminescence properties (TL) for the purpose of ionizing radiation dosimetry. The aim of this study consists in the characterization of the thermoluminescence properties of natural quartz crystals, to be used for radiat
Publicado em: 2005
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14. Técnicas analíticas nucleares aplicadas a medida em larga escala de aerossóis atmosféricos na região amazônica / Nuclear analytical techniques applied to large-scale measurement of atmospheric aerosols in the Amazon region
Neste trabalho o aerossol atmosférico, presente em diferentes localidades da região Amazônica, foi caracterizado. Foram estudadas as emissões biogênicas naturais da floresta, bem como as emissões de material particulado para a atmosfera, devido à ocorrência em larga escala de queimadas na Amazônia durante a estação seca. O aerossol atmosférico fo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/03/1996
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15. Upper boundary of the biosphere.
By using meterological rockets fitted with specially designed analyzers, samples for microbiological investigation have been taken. The analyzer design prevented extraneous microorganisms from penetrating into the analyzer. Before being used, the analyzers were sterilized with high gamma-ray doses. For the first time microorganisms have been detected in the
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16. Structure of the mitochondrial F1 ATPase at 9-A resolution.
The soluble portion (F1 ATPase) of the mitochondrial ATP-synthesizing system is a multisubunit enzyme of molecular weight 380,000. It is composed of five different subunits, alpha, beta, gamma, and epsilon. The subunit stoichiometry is not known but there are strong suggestions that it is alpha 3 beta 3 gamma delta epsilon. We have determined the three-dimen
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17. X-ray crystal structure of a dimethylene sulfone-bridged ribonucleotide dimer in a single-stranded state.
A crystal structure has been solved for an analog of the r(ApU) ribodinucleotide, r(Aso2U), where a bridging non-ionic dimethylene sulfone linker replaces the phosphodiester linking group found in natural RNA. Crystals of the single-stranded state of r(Aso2U) were obtained from water at 50 degrees C. In these crystals, one hydrogen bond is formed between bas
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18. Identification, activity, and structural studies of peptides incorporating the phorbol ester-binding domain of protein kinase C.
The family of homologous enzymes known as protein kinase C (PKC) has been the object of intense interest because of its crucial role in cellular signal transduction. Although considerable information about the activation of PKC has been gained through structure-activity, molecular modeling, and synthetic studies of both natural and designed activators, infor