Electron Paramagnetic Resonance Epr
Mostrando 13-24 de 162 artigos, teses e dissertações.
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13. Theoretical studies of the local structure and the EPR parameters for substitutional Mo5+ in TiO2
The electron paramagnetic resonance(EPR) parameters g-factors g i(i = x,y,z) and the hyperfine structure constants Ai for the substitutional Mo5+ in rutile are theoretically studied from the perturbation formulas of these parameters for a d¹ ion in a rhombically compressed octahedron. On the basis of the studies, The oxygen octahedron around Mo5+ is found t
Brazilian Journal of Physics. Publicado em: 2010-09
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14. Theoretical studies of the EPR parameters for Ni2+ and Co+ in MgO
The electron paramagnetic resonance (EPR) parameters (g factors and the hyperfine structure constants) for Ni2+ and Co+ in MgO are theoretically studied from the perturbation formulas of these parameters for a 3d8 ion in octahedral crystal-fields. In the computations, the ligand orbital and spin-orbit coupling contributions are taken into account using the c
Brazilian Journal of Physics. Publicado em: 2010-09
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15. Overview of ligand versus metal centered redox reactions in tetraaza macrocyclic complexes of nickel with a focus on electron paramagnetic resonance studies
Complexos de cobre(II) (3d9, S = 1/2) são estáveis e amplamente investigados por espectroscopia de ressonância paramagnética eletrônica (EPR). Já o isoeletrônico níquel(I) é muito menos comum e muito menos estudado. No entanto, níquel(I) tem interesse biológico, uma vez que o sítio ativo da metil coenzima M redutase (MCR) contém um ligante macro
Journal of the Brazilian Chemical Society. Publicado em: 2010
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16. Estudo de propriedades de luminescência, de ressonância paramagnética eletrônica e de centros de cor da pumpelita e de sua correlação com defeitos pontuais. / Study of luminescence, electron paramagnetic resonance and color conters in pumpellyte and their correlation with point defeets
Cristais naturais de pumpelita Ca8Al8(Mg,Fe,Mn,Al)[(SiO4)4/(Si2O7)4/(OH)8(H2O, OH)4]), provenientes da mina de Brejui, município de Currais Novos, Rio Grande do Norte, foram investigados através das técnicas de termoluminescência (TL), absorção óptica (AO) e ressonância paramagnética eletrônica (EPR) com o intuito de entender os efeitos da radiaç�
Publicado em: 2010
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17. Pequenos polarons ligados e centros de cor em topázio
In the present work we studied the color beneficiation processes of colorless topaz, an abundant gemstone in Brazil. Blue topaz is the most internationally traded gemstone in the gem and market, reaching about 100 million carats per year. Almost 100% of blue topaz received some treatment to improve the color that, generally, involves some type of irradiation
Publicado em: 2010
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18. Estudos dosimétricos em interfaces teciduais em radioterapia utilizando dosimetria por ressonância paramagnética eletrônica EPR / Studies on Tissue Interfaces Dosimetry in Radiotherapy Using Electron Paramagnetic Resonance Dosimetry by EPR
A acurácia e precisão exigida nas novas técnicas radioterápicas é bastante elevada, como no caso da Radioterapia com Intensidade Modulada (IMRT). Desta forma, o tamanho dos dosímetros a serem utilizados nas medidas experimentais é um fator crítico. Além disso, a ausência de equilíbrio eletrônico lateral e a existência de intensos gradientes de d
Publicado em: 2010
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19. X-ray photoinduced effects in glassy films of CuO doped [Sb(PO3)3]n-Sb2O3 system / Estudo dos efeitos fotoinduzidos por Raio-X em filmes vítreos do sistema [Sb(PO3)3]n-Sb2O3 dopados com CuO
The photosensibility to radiation of phosphate glasses is a property that has attracted great interest in the last decades12. In this work, we realized a systematic and comparative study of the photoinduced phenomena through characterization of the doped copper oxide (CuO) (Sb(PO3)3)n-Sb2O3 system films. In this study, we observed the photostructural changes
Publicado em: 2010
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20. Investigation of structural, electronic and magnetica properties of Ca2-xLaxFelrO6, Sr2-xLaxFelrO6 e TbMnO3 oxides / Investigação as propriedades estruturais, eletronicas e magneticas dos oxidos Ca2-xLaxFelrO6, Sr2-xLaxFelrO6 e TbMnO3
For many decades the transition metal oxides are subject of great scientific interest because of the wide variety of interesting physical properties and their potential technological applications. More recently, for example, oxides of transition metals with multiferroic properties have been considered as potential magneto-electronic devices. Many transition
Publicado em: 2010
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21. Estudos conformacionais de peptídeos correspondentes à região N-terminal das toxinas protéicas esticolisinas I e II / Conformational Studies of Peptides Corresponding to the N-terminal Region of the Proteinaceous Toxins Sticholysin I and II
Esticolisinas I e II (S tI e St II), citolisinas pertencentes à família das actinoporinas, da anêmona Stichodactila heliantus, formam poros em membranas biológicas e modelo onde seu receptor putativo é esfingomielina (SM). A ligação das actinoporinas a membranas ocorre pelo ancoramento da proteína à interface lipídio-água, por uma região rica em
Publicado em: 2010
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22. 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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23. Characterization of oil shale residue and rejects from irati formation by electron paramagnetic resonance
In this study, sedimentary organic matter of oil shale rejects, calschist, shale fine and the so called retorted shale from Irati formation was characterized. EPR was used to analyse the samples regarding loss of signal in g = 2.003 associated to the organic free radical with the calcined samples and washing with hydrogen peroxide. The radical signal was det
Brazilian Journal of Physics. Publicado em: 2009-03
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24. 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