Uranyl Compounds
Mostrando 1-10 de 10 artigos, teses e dissertações.
-
1. Estudo das propriedades espectroscópicas de matrizes de Urânio dopadas com Európio.Tranferência de energia entre o UO22+ e o EU3+ / Study of the spectroscopy properties of uranium matrix doped with europium. Energy transfer between UO22+ and Eu3+
Complexos do íon uranilo (UO22+) apresentam um grande potencial como materiais luminescentes, aplicados em tecnologia laser, sondas luminescentes, células para conversão de energia solar, etc. Neste trabalho avaliou-se a eficiência da transferência de energia no aquo-complexo de UO2(MS)22H2O dopado com Eu3+ (MS = íon metanossulfonato, CH3SO3-) e no aqu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/08/2007
-
2. Study of magnetite as adsorbent material of uranyl ions / Estudo da magnetita como material adsorvedor de íons uranilo
A magnetita, também chamada de ferrita de ferro, é um minério conhecido como imã natural e encontrada em depósitos de ferro. Além desse comportamento intrínseco, a magnetita possui a capacidade de remover os íons metálicos do meio aquoso por fenômenos de adsorção. O seu caráter fortemente magnético a distingue de outros tipos de adsorventes, vi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/03/2006
-
3. Síntese e Análise Estrutural de Complexos de Urânio(VI) com Hidrazonas, Semicarbazonas e Ligantes Relacionados. / Synthesis and Structural Analysis of Uranium(VI) Complexes with Hydrazones, Semicabazones and Related Ligands.
Uranyl complexes with ligands with oxygen and nitrogen donors have been extensively reviewed and they have aroused interest on account of their high stability, usefulness in selective chemical separations and their formation in higher coordination numbers, but quite a few complexes of hydrazone and semicarbazone ligands have been reported. This fact was the
Publicado em: 2006
-
4. Espectroscopia de luminescencia resolvida no tempo : implementação da tecnica e aplicações
Initially, the optimization of the SR250 Boxcar integrator and averager s parameters for excited-state lifetime measurements was performed. A quantitative theoretical model which takes into account the linear RC time constant distortions on the excited-state lifetime (t) decay waveforms was proposed. The computer simulations using a mathematical expression,
Publicado em: 1992
-
5. Induction and Properties of the Citrate Transport System in Aerobacter aerogenes
The mediated transport of citrate in Aerobacter aerogenes was studied. According to data obtained by examining the distribution of radioactive citrate at room temperature and at 0 C, a carrier system appears to be located on the membrane. The carrier system is inducible and very specific, not acting on the related compounds isocitrate and cis-aconitate. Indu
-
6. REDUCTION OF INORGANIC COMPOUNDS WITH MOLECULAR HYDROGEN BY MICROCOCCUS LACTILYTICUS I. : Stoichiometry with Compounds of Arsenic, Selenium, Tellurium, Transition and Other Elements
Woolfolk, C. A. (University of Washington, Seattle) and H. R. Whiteley. Reduction of inorganic compounds with molecular hydrogen by Micrococcus lactilyticus. I. Stoichiometry with compounds of arsenic, selenium, tellurium, transition and other elements. J. Bacteriol. 84:647–658. 1962.—Extracts of Micrococcus lactilyticus (Veillonella alcalescens) oxidize
-
7. Steroid Lysis of Protoplasts and Effects of Stabilizers and Steroid Antagonists
Six synthetic antimicrobial steroids were examined for indications of their mechanism of action. Dequadin acetate, cetyl pyridinium chloride (CPC), and sodium deoxycholate were studied for comparison. Aerated cells of Sarcina lutea were washed, suspended in 1.06 M sucrose, and converted to protoplasts with 20 μg/ml of lysozyme. Lysis was measured optically
-
8. Uptake of 2,4-Dichlorophenoxyacetic Acid by Pseudomonas fluorescens
Factors influencing the uptake of the sodium salt of 2,4-dichlorophenoxyacetic acid (2,4-D), under conditions in which no net metabolism occurred, were investigated in an effort to determine both the significance of “non-metabolic” uptake as a potential agent in reducing pesticide levels and the mechanisms involved. Uptake of 2,4-D was affected by pH, te
-
9. High-molecular-mass multicatalytic proteinase complexes produced by the nitrogen-fixing actinomycete Frankia strain BR.
A major-high-molecular mass proteinase and seven latent minor proteinases were found in cell extracts and in concentrates of culture medium from Frankia sp. strain BR after nondenaturing electrophoresis in mixed gelatin-polyacrylamide gels. All of these complexes showed multicatalytic properties. Their molecular masses and their sedimentation coefficients va
-
10. Induction of germ tube formation by N-acetyl-D-glucosamine in Candida albicans: uptake of inducer and germinative response.
A number of strains of Candida albicans were tested for germ tube formation after induction by N-acetyl-D-glucosamine (GlcNAc) and other simple (proline, glucose plus glutamine) or complex (serum) compounds. A proportion of strains (high responders) were induced to form germ tubes evolving to true hyphae by GlcNAc alone or by proline or glucose plus glutamin