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155456 documents, page 1 of 15546

Bacia do Rio Maruim : transformações e impactos ambientais

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciencias Humanas O trabalho "Bacia do Rio Maruim: transformações e impactos ambientais" objetiva o diagnóstico da situação atual da área da bacia, com as potencialidades naturais e as alterações sofridas ao longo do tempo, compatibilizando o uso dos recursos naturais com a preservação, através da interação elementos naturais e o humano. A metodologia constou de uma análise temática dos diversos aspectos ...

Enhanced generation of hydroxyl radical and sulfur trioxide anion radical from oxidation of sodium sulfite, nickel(II) sulfite, and nickel subsulfide in the presence of nickel(II) complexes.

Electron spin resonance (ESR) spin trapping was utilized to investigate the generation of free radicals from oxidation of sodium sulfite, nickel(II) sulfite, and nickel subsulfide (Ni3S2) by ambient oxygen or H2O2 at pH 7.4. The spin trap used was 5,5-dimethyl-1-pyrroline-N-oxide (DMPO). Under ambient oxygen, a solution of sodium sulfite alone generated predominantly sulfur trioxide anion radical (.SO3-) due to the autoxidation of sulfite. Addition of nickel(II) chloride [Ni(II)] enhanced the...

.

Este trabalho reporta 11 registros de avistagens de baleias-jubarte, Megaptera novaeangliae, para o arquipélago de Fernando de Noronha (3º51'S 32º25'W) entre 1989 e 1993 através de observações pessoas e informações confiáveis de habitantes locais. Embora exista um registro prévio confirmado da ocorrência da espécie no arquipélago de Fernando de Noronha através da captura de um exemplar por norte-americanos e possíveis capturas realizadas por moradores do século passado, apenas em agosto de 19...

Etude, expérimentation et modélisation de structures hybrides innovantes Tournantes et linéaires

Travaux effectués en étroite relation avec Bernard MULTON, Hamid BEN AHMED.; The innovative devices studied in this thesis are characterized by the following principles: - These are synchronous machines with hybrid excitation field created by permanent magnets located on the same set as the armature winding. - So the other part is passive. - The change in the flow of induction through the armature windings is obtained by switching the flow of permanent magnets with pole pieces on the passive ...

Transient Electromagnetic Wave Propagation in Transverse Periodic Media

In this paper, wave propagation of electromagnetic pulses in media that are periodic in one spatial direction is analyzed by a time domain technique. The special case of wave propagation in an inhomogeneous planar waveguide with perfectly conducting walls is also discussed. The wave equation is reduced to a set of one dimensional first order hyperbolic equations by an expansion in a complete set of basis functions and by utilizing a wave splitting technique. The method is es...

Interplay of two functionally and structurally distinct domains of the c-fos AU-rich element specifies its mRNA-destabilizing function.

AU-rich elements (ARE) in the 3' untranslated region of many highly labile mRNAs for proto-oncogenes, lymphokines, and cytokines can act as an RNA-destabilizing element. The absence of a clear understanding of the key sequence and structural features of the ARE that are required for its destabilizing function has precluded the further elucidation of its mode of action and the basis of its specificity. Combining extensive mutagenesis of the c-fos ARE with in vivo analysis of mRNA stability, we...