Dtn
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Localização de recursos em redes de emergência tolerantes a atrasos e desconexões
In emergency scenarios such as natural disasters, communication networks can be used to assist in the communication and coordination efforts to minimize losses from the disaster. A problem in these situations is that the network infrastructure may have been destroyed by the disaster or not be available to first responders. A solution to this problem are mobi
Publicado em: 2010
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14. Epidemiologia da giardíase e de geohelmintoses como doenças tropicais negligenciadas em três municípios da Zona da Mata Mineira
Doenças tropicais negligenciadas (DTNs), assim classificadas pela Organização Mundial de Saúde, constituem um grupo de infecções praticamente eliminadas no mundo desenvolvido, mas que persistem em áreas pobres de países de baixa renda. Dentre elas estão a ascaridíase, a tricuríase e a ancilostomíase, cujos agentes etiológicos têm parte de seu c
Publicado em: 2010
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15. Características químicas da água de córregos do Distrito Federal sob diferentes usos e cobertura do solo
The Cerrado is the second largest Brazilian biome and location of the headwaters of three important hydrological basins in Brazil. In spite of the biological and ecological relevance of this biome, there is little information about how land use changes affect the chemistry of surface water, groundwater and streams. In order to evaluate the effects of these c
Publicado em: 2008
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16. Metabolismo da homocisteína e defeitos do tubo neural : um estudo bioquímico e molecular no sul do Brasil
Os defeitos de fechamento de tubo neural constituem uma das malformações mais freqüentes na espécie humana, apresentando alta morbi-mortalidade. Sua etiologia é considerada multifatorial, estando envolvidos fatores genéticos e ambientais. Estes fatores estão relacionados principalmente com o metabolismo da homocisteína. Realizamos um estudo de caso-c
Publicado em: 2007
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17. Numerical methods for the dynamics of unbounded domains
The present article discusses the relation between boundary conditions and the Sommerfeld radiation condition underlying the dynamics of unbounded domains. It is shown that the classical Dirichlet, Neumann and mixed boundary conditions do not fulfill the radiation condition. In the sequence, three strategies to incorporate the radiation condition in numerica
Computational & Applied Mathematics. Publicado em: 2005-04
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18. Estudo do cariotipo constitucional e dos tecidos envolvidos na lesão de crianças portadoras de defeito do tubo neural (DTN) por meio de analise citogenetica convencional e FISH
The association between chromosomal abnormalities, specially aneuploidies and neural tube defects (NTDs) is well known, principally when NTD is not the only malformation present. Recently, research in animal models, using fluorescence in situ hybridization (FISH) identified aneuploidy in neural tissues. The aims of this work were to identify the frequency of
Publicado em: 2004
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19. Analise vibro-acustica utilizando o metodo de elementos finitos com mapeamento Dirichlet-to-Neumann (DtN)
This work were interested in finding a method of fluid-structure coupling with infinite fluid medium. After a literature analysis in infinite fluid medium modeling, were adopted the Dirichlet-to-Neumann (DtN) Method, wich is exact, non refiexive and can be directly included in the Finite Element Method (FEM) wich is used in fluid-structure modeling. First, t
Publicado em: 1999
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20. Mechanism of action of Moloney murine leukemia virus RNase H III.
The mechanism of action of Moloney murine leukemia virus RNase H III was studied, utilizing the model substrate (A)n. (dT)n and polyacrylamide gel electrophoresis to assay enzyme activity. Examination by electrophoresis on 15% polyacrylamide gels in 7 M urea and on DEAE-cellulose paper in 7 M urea revealed that, early in a reaction with [3H](A)n. (dT)n as su
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21. Differential stabilization by netropsin of inducible B-like conformations in deoxyribo-, ribo- and 2'-deoxy-2'-fluororibo-adenosine containing duplexes of (dA)n . (dT)n and (dA)n . (dU)na.
Six polynucleotide duplexes containing polydeoxyadenylic acid, polyadenylic acid or poly-2'-deoxy-2'-fluoro-adenylic acid in one strand, and polydeoxyuridylic acid or polydeoxythymidylic acid in the other strand have been studied by circular dichroism, ionic strength dependence of melting temperatures and binding of the DNA specific antibiotic netropsin. Cir
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22. Hydration of the dTn.dAn x dTn parallel triple helix: a Fourier transform infrared and gravimetric study correlated with molecular dynamics simulations.
We present a comparative analysis of the water organization around the dTn.dAn x dTn triple helix and the Watson-Crick double helix dTn.dAn respectively by means of gravimetric measurements, infrared spectroscopy and molecular dynamics simulations. The hydration per nucleotide determined by gravimetric and spectroscopic methods correlated with the molecular
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23. Conformational requirements for dopamine-induced vasodilation.
The availability of a series of semi-rigid analogs of dopamine and epinine has made it possible to investigate the conformational requirements for action on dopamine and beta2-adrenergic vascular receptors. The analogs were screened for dopamine-agonist action by intra-arterial injections into the renal vascular bed and for beta2-adrenergic activity by simil
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24. Biochemical properties of oligo [(+)-carbocyclic-thymidylates] and their complexes.
We report here spectroscopic and biochemical data of a novel series of sugar-modified oligodeoxy-nucleotides, the carbocyclic oligothymidylates, c(dT)3-20. In c(dT)n a methylene group has been substituted for the oxygen atom of the deoxyribose ring of the natural thymidylate unit. c(dT)10-20 form helical structures, in contrast with oligothymidylates or poly