Phosphotungstate
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. The Effect of Ormosil Matrix Composition and Alkaline Earth Metal Doping on the Photochromic Response of Ormosil-Phosphotungstate Films
In this study, polyoxometallate based hybrid photochromic materials were prepared by incorporating phosphotungstate anion, PW12O403−, (PW) in hybrid tetraethyl orthosilicate and (3-glycidyloxypropyl)trimethoxysilane TEOS-GPTMS derived organomodified silicates (Ormosil) matrices by sol-gel method and the resulting materials were used to prepare multilayer f
J. Braz. Chem. Soc.. Publicado em: 2015-12
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2. Nanopartículas de dióxido de titânio como aditivos em materiais híbridos orgânico-inogânico fotocrômicos baseados em fosfotungstatos / Titanium dioxide nanoparticles as an additive for photochromic hybrid organic-inorganic materials based on phosphotungstate
Nesse estudo procurou-se avaliar o impacto do aditivo dióxido de titânio, mistura anatase-rutila, no comportamento fotocrômico de nanocompósitos baseados em materiais híbridos do tipo silicatos orgânicos (Ormosis) contendo ácido fosfotúngstico, \ H IND.3\ PW IND.12\ O IND.40\ . O material híbrido foi obtido via processo sol-gel tendo sido caracteriz
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/02/2011
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3. Comparative study of acid catalysts for biodiesel production / Estudo comparativo de catalisadores ácidos para a produção de biodiesel
Para que o processo de produção de biodiesel se torne auto-sustentado, ou seja, socialmente, ecologicamente e economicamente viáveis, alguns aspectos químicos ainda precisam ser estudados e aprimorados. Dentre estes, dois são relevantes: alta eficiência no rendimento da reação e o uso de catalisadores de maneira ecologicamente responsável. Para aten
Publicado em: 2009
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4. Efeito da matriz no comportamento fotocrômico de ormosils de fosfotungstato / Matriz effect in photochromic behavior of phosphotungstate ormosils
Esta dissertação versa sobre o estudo de filmes híbridos orgânicos-inorgânicos do tipo ormosil com heteropoliânions do tipo Keggin. O heteropoliânion usado nesse trabalho foi: H3PW12O40 enquanto o ormosil foi obtido a partir do processo sol-gel usando tetraetilortossilicato (TEOS) como agente formador da rede 3D de silicatos e organossilanos contendo
Publicado em: 2008
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5. InfluÃncia da infecÃÃo pelo lentivÃrus Caprine arthritis â encephalitis vÃrus nos lipÃdeos plasmÃticos de caprinos
Caprine arthritis-encephalitis virus (CAEV) infection is a progressive chronic disease characterized by arthritis, lesions in lymphoid tissue, nervous system and in other organs, weight loss, weakness and death of the animals. The present study aimed to evaluate the cholesterol, phospholipids and triglycerides levels in caprine flock from Pernambuco/Brazil.
Publicado em: 2005
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6. Construção e avaliação de eletrodos seletivos ao antibiotico tiamulina
The antibiotic tiamulin hydrogen fumarate can be assayed by using ion-selective electrodes. These electrodes can be made with membranes of PVC or ethylene/vinyl acetate copolymer (EVA) with the ionic pairs tiamulin tetraphenylborate and tiamulin phosphotungstate. Most of the ion-selective electrodes prepared showed nernstian response in the range from 1,0 x
Publicado em: 1995
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7. Disruptive Action of Potassium Phosphotungstate on φT, the Temperate Bacteriophage of Bacillus megaterium 899a
Although untreated φT may be dried on grids without damage, they were disrupted when negatively stained with potassium phosphotungstate. The potassium phosphotungstate reacted with phage suspended in phosphate buffer, and the altered but still-viable phage was disrupted only on drying. Stability of altered phage was not recovered by dialysis against 10−3
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8. Comparison of plasma and urinary concentrations of uric acid measured by the colorimetric phosphotungstate and enzymatic uricase methods
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9. Biochemical and morphological characterization of mycobacteriophage R1.
Large-scale propagation of mycobacteriophage R1 in broth culture has allowed the isolation of quantities of virus sufficient for characterization of its nucleic acid and lipid components as well as investigation of its ultrastructural attributes. Analysis of R1 DNA indicates that it is double stranded and possesses a molecular weight of 2.5 X 10(7) and a gua
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10. Electron microscopy of bacteriophage phi 6 nucleocapsid: three-dimensional image analysis.
Electron micrographs of bacteriophage phi 6 nucleocapsids, negatively stained by neutralized phosphotungstate and tilted in a goniometer specimen cartridge, proved that the three distinct morphologies seen in the electron microscope are merely three different aspects of a single nucleocapsid structure and strongly suggested that this structure is dodecahedra
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11. Bracelet protein: a quaternary structure proposed for the giant extracellular hemoglobin of Lumbricus terrestris.
The complete dissociation of the hexagonal bilayer structure of Lumbricus terrestris hemoglobin (3900 kDa) at neutral pH, in the presence of urea, guanidine hydrochloride, sodium perchlorate, potassium thiocyanate, sodium phosphotungstate, and sodium phosphomolybdate, followed by gel filtration at neutral pH on Sephacryl S-200 or Superose 6, produced two fra
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12. Electron Microscopy of a Strain of Bordetella bronchiseptica
A strain of Bordetella bronchiseptica that had been isolated from a rat hepatoma cell culture was investigated by means of electron microscopy. Bacteria were examined after (i) negative staining with phosphotungstate or uranyl acetate, (ii) metal shadowing with platinum-palladium, and (iii) fixation with glutaraldehyde followed by embedding, sectioning, and