Inorganic Oxides
Mostrando 25-31 de 31 artigos, teses e dissertações.
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25. Química organometálica de superfície aplicada à preparação de catalisadores heterogêneos bem definidos
The study of the reactions of organometallic complexes with the surfaces of inorganic oxides, zeolites and metals constitutes the basis of Surface Organometallic Chemistry (SOMC). The basic rules of organometallic chemistry are often valid when applied to surfaces and well-defined surface organometallic complexes can be obtained. These complexes can be used
Química Nova. Publicado em: 2002-11
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26. Fases estacionárias para cromatografia líquida de alta eficiência em fase reversa (CLAE-FR) baseadas em superfícies de óxidos inorgânicos funcionalizados
Particles of porous silica or other solvent resistent inorganic oxides can be functionalized by aliphatic (e.g., C-8 or C-18) or other groups to give stationary phases for use in reversed phase HPLC. The functionalization can be done by bonding of individual groups to the surface of the support particles, by producing an organic polymeric film from pre-polym
Química Nova. Publicado em: 2002-07
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27. Hibridos lamelares e hexagonais envolvendo silicio, aluminio, zirconio e titanio
By using tetraethylortosilicate, amorphous silica-gel, tetrabutoxyde of aluminium, zirconium and titanium, as well as n-alkyldiamnines as precursors, a series of twenty nine inorganic-organic hybrid materiais, with lamellar or hexagonal structures were synthesized. Is shown that lamellar silica samples can be sucessfully used as sequestrating agents for tran
Publicado em: 2000
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28. Role of inorganic nitrogen oxides and tumor necrosis factor alpha in killing Leishmania donovani amastigotes in gamma interferon-lipopolysaccharide-activated macrophages from Lshs and Lshr congenic mouse strains.
The capacity of mature bone-marrow-derived macrophages and resident peritoneal macrophages from Lshr versus Lshs congenic mice to kill intracellular Leishmania donovani amastigotes when activated by recombinant gamma interferon-lipopolysaccharide (rIFN-gamma-LPS) was examined. IFN-gamma alone in doses up to 100 U/ml was unable to activate macrophages to kill
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29. Separate Nitrite, Nitric Oxide, and Nitrous Oxide Reducing Fractions from Pseudomonas perfectomarinus
Pseudomonas perfectomarinus was found to grow anaerobically at the expense of nitrate, nitrite, or nitrous oxide but not chlorate or nitric oxide. In several repetitive experiments, anaerobic incubation in culture media containing nitrate revealed that an average of 82% of the cells in aerobically grown populations were converted to the capacity for respirat
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30. Microbial Formation of Manganese Oxides
Microbial manganese oxidation was demonstrated at high Mn2+ concentrations (5 g/liter) in bacterial cultures in the presence of a microalga. The structure of the oxide produced varied depending on the bacterial strain and mode of culture. A nonaxenic, acid-tolerant microalga, a Chlamydomonas sp., was found to mediate formation of manganite (γ-MnOOH). Bacter
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31. EPR demonstration of iron-nitrosyl complex formation by cytotoxic activated macrophages.
Activated macrophage cytotoxicity is characterized by loss of intracellular iron and inhibition of certain enzymes that have catalytically active nonheme-iron coordinated to sulfur. This phenomenon involves the oxidation of one of the terminal guanidino nitrogen atoms of L-arginine, which results in the production of citrulline and inorganic nitrogen oxides