Polarography
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Lixiviacao do glyphosate e do imazapyr em solos com diferentes texturas e composicao quimica. II. Metodo analitico.
1999
Planta Daninha. Publicado em: 2011
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2. Determinação de Sn(II) por polarografia: aplicação no controle de qualidade de reagentes liofilizados para radiodiagnóstico / Polarographic determination of Sn(II): application in the quality control of radiopharmaceutical reagents
Stannous chloride (SnCl2.2H2O) is the major compound used for reduction of generator-derived 99mTc-pertechnetate in cold kits for on site preparation of 99mTc-radiopharmaceuticals. These cold kits usually contain a ligand, stannous chloride, and different additives. Various techniques were described for tin determination, but they cannot distinguish between
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2008
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3. Resposta imune celular em culturas de células do sistema nervoso central de rato infectados com Neospora Caninum.
Neosporosis is a disease caused by Neospora caninum, an intracellular parasite that infects a wide range of animals, causes abortion in cattle, and neurologic disease in dogs. To study the pathogenic effects of this parasite, especially its correlation with the immunological system, we described a model of infection in vitro, using rat glial cells. Glial cel
Publicado em: 2006
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4. Determinação de Sb (V) em medicamentos antileishmanioticos por extração liquido-liquido em sistema automatizado de analise em fluxo
In this work a selective method for the Sb (V) determination in antileishmaniotics drugs is proposed, based on the extraction of an ion pair formed between hexachloroantimoniate anion and the rhodamine a cation in an automated liquid-liquid extraction flow analysis system (LLE-FA). The ion-pair was formed in hydrochloride acid and as solvent toluene was empl
Publicado em: 2003
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5. Estudo polarografico de Fe(III) e Cu(II) em diversas matrizes utilizando eletrolito de suporte a base de citrato e EDTA
The polarographic determination of Fe(lll) in the presence of different species, including Cu(II), shows a characteristic: the overlapping of the peak potential of the Fe(lll) with the peak potentials of the other species. This interference can be eliminated through the addition of complexing agents like citrate, which cause the dislplacing of these potentia
Publicado em: 2001
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6. Aplicações de técnicas espectroscópicas e polarográficas para caracterização e avaliação da reatividade do húmus com o herbicida atrazina. / Application of spectroscopic and polarographic methods to characterize and evaluate the reactivity between humus and atrazine.
One alternative to disposal of urban residues is recycling through composts and earthworm composts (humus production). The absence of a quality standard of these materials however brings limitations to commercial development with damage to producers and consumers. In this work was proposed a strategic parameter to be used as standard. From Electron Paramagne
Publicado em: 1999
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7. Study of reduction of cobalt(II) in sodium azide aqueous medium by pulse polarography / Estudo da redução do cobalto(II) em meio aquoso de azoteto de sódio por polarografia de pulso
The electroreduction of Co(ll) in perchloric media gives origin to a polarographic wave about -1.4 V VS. SCE at 25°C. With the addition of the azide ligand, N3-, that wave shifts towards more positive potentials. The higher value of the potential shift, 320 mV, is recorded for the concentration 0,600 M of ligand. The shift can be explained by the adsorption
Publicado em: 1994
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8. Estudos polarográficos envolvendo aquo-íons de molibdênio em meio sulfúrico e caracterização de processo catalítico na presença de ácido azotídrico / Polarographic studies on molybdenum aquo-ions in sulphuric solutions and characterization of a catalytic process in the presence of hydrazoic acid
A literatura cita o aparecimento de onda catalítica polarográfica do Mo(VI) na presença de NO-3. Há menção na literatura sobre comportamento semelhante entre o ácido azotídrico e o ácido nítrico em relação ao poder de oxidação. Seguindo uma linha de pesquisa da área de Química Analítica deste Instituto, procedeu-se a estudos envolvendo a exi
Publicado em: 1992
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9. Estudos de adsorção e de equilíbrios no sistema cádmio(II)/piridina/cloreto. Desenvolvimento de instrumentação / Adsorption and equilibrium studies of the cadmium(II)/pyridine/chloride system; development of instrumentation
O presente trabalho começa por uma apresentação monográfica do fenômeno de adsorção, que dá acesso à bibliografia existente sobre o assunto. Numa extensa parte experimental desenvolveu-se um eletrodo de amálgama gotejante e um eletrodo de gota pendente mercúrio capaz de gerar gotas com área reprodutível dentro de ± 0,1%. Fez-se, também, a
Publicado em: 1978
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10. The Actions of Secretagogues on Oxygen Uptake by Isolated Mammalian Parietal Cells
The action of histamine, carbamylcholine, and gastrin on oxygen uptake by cells isolated from canine fundic mucosa was studied in vitro. Viable mucosal cells were prepared by exposure of separated mucosa sequentially to collagenase and EDTA. Oxygen consumption, determined by polarography, was chosen as an index of physiological response of mucosal cells to s
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11. A Dry Ashing Method for the Determination of Blood Lead using Cathode Ray Polarography: Comparison with a Wet Ashing Technique
A dry ashing method is described for the determination of lead in whole blood. Within the range of 16-200 μg. lead per 100 ml. blood recoveries were 82 to 100%. The method agreed with a standard wet method and is more convenient. Possible sources of error and the uses of the ashing aid are discussed.
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12. Hormonal Interactions in Mucor mucedo and Blakeslea trispora
Evidence is presented that progametangia in both the plus and the minus mating types of Mucor mucedo can be induced by one substance, namely (−)-trisporic acid B. A method is described for the determination of the concentration of the sex factors (trisporone, trisporic acid B, trisporic acid C) in mated cultures of Mucorales by polarography. It can be demo