Pulsed Epr
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. EPR studies of the enzyme chlorocatechol 1,2-dioxygenase and of the dynamic structure of biomembranes / Estudos da enzima clorocatecol 1,2-dioxigenase por EPR convencional e da estrutura dinâmica de biomembranas por EPR pulsada bidimensional
Neste trabalho, usamos a técnica de Ressonância Paramagnética Eletrônica em seu modo convencional para o estudo da enzima clorocatecol 1,2-dioxigenase e em seu modo pulsado para o estudo da estrutura dinâmica de biomembranas. Clorocatecol 1,2-dioxigenase é uma enzima que catalisa a clivagem de estruturas aromáticas, como a do clorocatecol, via a a ati
Publicado em: 2001
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2. Existência de diferentes estados de spin dos íons Fe2+ e Fe3+ do citocromo c resultante da interação com lipossomos modelos. / Existence of different heme iron Fe2+ and Fe3+ spin states cytochrome c ions results the interaction with lipid bilayers.
This association lipid/cytochrome c is interesting to study in order to understand the peroxidase activity of this protein, that plays an important role in the respiratory chain and in the apoptosis process or the programmed cell death. The nature and specificity of the interaction of cytochrome c with lipid bilayers have been major goals in recent studies,
Publicado em: 2001
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3. Magnetic resonance study of polymeric composites and fluoroindate glasses. / Estudo de compósitos poliméricos e vidros fluoroindatos por ressonância magnética.
Polymeric composites and fluoroindate glasses were studied using pulsed Nuclear Magnetic Resonance (NMR) and Electron Paramagnetic Resonance (EPR) spectroscopies. Study of the composite formed by the polymer poly-ethylene oxide and carbon particles allowed us to distinguish the mobilities of polimeric chains and to identify the contributions from different p
Publicado em: 1999
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4. Light-generated nuclear quantum beats: a signature of photosynthesis.
Light-induced radical pairs in deuterated and deuterated plus 15N-substituted Synechococcus lividus cyanobacteria have been studied by transient EPR following pulsed laser excitation. Nuclear quantum beats are observed in the transverse electron magnetization at lower temperatures. Model calculations for the time profiles, evaluated at the high-field emissiv
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5. Identification of histidine at the catalytic site of the photosynthetic oxygen-evolving complex.
The molecular oxygen in our atmosphere is a product of a water-splitting reaction that occurs in the oxygen-evolving complex of photosystem II of oxygenic photosynthesis. The catalytic core of the oxygen-evolving complex is an ensemble of four manganese atoms arranged in a cluster of undetermined structure. The pulsed electron paramagnetic resonance (EPR) te