Electron Paramagnetic Resonance Spectroscopy
Mostrando 13-24 de 150 artigos, teses e dissertações.
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13. Modulation of ROS production in human leukocytes by ganglioside micelles
Recent studies have reported that exogenous gangliosides, the sialic acid-containing glycosphingolipids, are able to modulate many cellular functions. We examined the effect of micelles of mono- and trisialoganglioside GM1 and GT1b on the production of reactive oxygen species by stimulated human polymorphonuclear neutrophils using different spectroscopic met
Brazilian Journal of Medical and Biological Research. Publicado em: 2010-10
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14. Aplicação da espectroscopia de ressonância paramagnética eletrônica e técnicas complementares no estudo dos compósitos restauradores fotopolimerizáveis
Os compósitos fotopolimerizáveis ainda requerem muitos estudos, pois, por não se polimerizarem completamente, apresentam alguns inconvenientes que podem omprometer a longevidade da restauração dentária. Diante disso, torna-se cada vez maior o interesse em realizarem-se novas investigações com metodologias que possam contribuir para um melhor entendim
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/09/2009
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15. EPR study of gamma induced radicals in amino and iminodiacetic acid derivatives
In this study, electron paramagnetic resonance spectroscopy was used to investigate free radicals formed in gamma irradiated L-glutamine hydrochloride, iminodiacetic acid hydrochloride and N-(2-hyroxyethyl) iminodiacetic acid powders. The free radicals produced in L-glutamine hydrochloride powders were attributed to the CH2CHCOOH radical; and those in iminod
Brazilian Journal of Physics. Publicado em: 2009-09
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16. Vanadium-modified molecular sieves: preparation, characterization and catalysis
Vanadium-containing molecular sieves are redox catalysts and are good candidates as substitutes for oxide-supported V2O5 in a number of reactions. These materials have the advantage of presenting better dispersion of vanadium species, as well as shape-selective properties and controllable acidities. They may be prepared by one-pot synthesis or by post-synthe
Química Nova. Publicado em: 2009
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17. Electron magnetic resonance in studies of biologically-relevant systems. / Ressonância magnética eletrônica no estudo de sistemas de interesse biológico
In this work, we made use of the Electron Paramagnetic Resonance (EPR) spectroscopy along with the so-called reporter group technique and extensive spectral simulations by means of the software NLSL to investigate the interaction of nicotine with model membranes. Besides that we also employed Ferromagnetic Resonance (FMR), which is a technique similar in man
Publicado em: 2009
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18. Ordem-desordem: uma avaliação estrutural do Ba(ZrxTi1-x)O3 / Order-disorder: an evaluation structural of Ba(ZrxTi1x)O3
This work have as aim, the synthesis of ceramic powders of Ba(ZrxTi1x)O3 (x = 0, 0.25, 0.50, 0.75 and 1) by the polymeric precursor method and investigate the degree of structural order-disorder of these systems by different characterization techniques, such as: thermogravimetric analysis (TA), differential thermal analysis (DTA), X-ray diffraction (XRD), Ra
Publicado em: 2009
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19. Efeitos de terpenos nas membranas de estrato córneo estudados por ressonância paramagnética eletrônica / Effects of terpenes on the stratum corneum membranes studied by electron paramagnetic resonance
The interaction of the skin penetration enhancers DL-menthol, -terpineol, 1,8-cineole and (+)-limonene with membranes of the uppermost skin layer, the stratum corneum (SC) and with multilamellar vesicles from 1,2-dipalmitoyl-sn-glycero-3-phosphaticylcholine (DPPC)is investigated by electron paramagnetic resonance (EPR) spectroscopy using spin-labeled
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2008
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20. Thermoluminescence, electron paramagnetic resonance and color centers properties of diopside / Propriedades de termoluminescência, de ressonância paramagnética eletrônica e de centros de cor de diopsídio
Diopside of chemical formula, CaMgSi2O6, a natural silicate mineral has been investigated concerning its Thermoluminescence (TL), Electron Paramagnetic Resonance (EPR) and Reflectance properties. Synthetic, pure or doped diopside, produced in the laboratory, has been investigated. Samples annealed at 600 `GRAUS´ C for one hour, to eliminate previously induc
Publicado em: 2007
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21. A perspective on applications of ligand-field analysis: inspiration from electron paramagnetic resonance spectroscopy of coordination complexes of transition metal ions
Este artigo descreve de maneira um tanto pessoal, o uso da espectroscopia de ressonância paramagnética eletrônica (EPR), incluindo EPR de alta freqüência e alto campo (HFEPR) para investigar a estrutura eletrônica de complexos de íons de metal de transição. Os parâmetros Hamiltonianos de spin, obtidos a partir de experimentos EPR, matriz g para sis
Journal of the Brazilian Chemical Society. Publicado em: 2006-12
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22. Glycymeris Longior shells, an alternative gamma radiation reference detector
Gamma irradiation of biogenic calcium carbonate, from fossil shells of species Glycymeris Longior, results in the formation of CO2 - centers, as measured by electron paramagnetic resonance spectroscopy. The spectral line intensity increases linearly with increasing dose, without distortion, up to 50Gy. Fitting of the data yields the equation, Dose[Gy]=-0.8(0
Brazilian Journal of Physics. Publicado em: 2006-03
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23. MECANISMOS DE NITROSILAÇÃO DE FERRO PORFIRINAS POR SNAP: CINÉTICA DE REAÇÃO E ESTABILIDADE EM AMBIENTE AERÓBICO / MECHANISMS OF NITROSYLATION OF IRON PORPHYRINS BY SNPA: KINETICS OF THE REACTION AND STABILITY UNDER AEROBIC ENVIRONMENT
Serveal metalic complexes have been identified as tergets for the binding of nitric oxide. In order that these complexes can be efficiently and safely used in medical applications, it is important to understand their kinetic and structural properties in realistic models. In this work, the optical absorption and electron paramagnetic resonance techniques were
Publicado em: 2006
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24. Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolites
Fe-ZSM-5 catalysts were prepared by ion exchange in aqueous medium or in the solid state and tested in the catalytic reduction of NO with iso-butane. X-ray powder diffraction (XRD), atomic absorption spectroscopy (AAS), electron paramagnetic resonance spectroscopy (EPR), X-ray absorption spectroscopy (XANES, EXAFS), temperature-programmed reduction by H2 (H2
Brazilian Journal of Chemical Engineering. Publicado em: 2005-09