Lamellar Compounds
Mostrando 13-21 de 21 artigos, teses e dissertações.
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13. Alterações histológicas de peixes como biomarcadores da contaminação aquática
Several streams from big cities are contaminated with industrial, domestic and agricultural effluents. The indiscriminated sewage and the release of substances considered risky into these streams may lead to damages in the water environment that may be considered as a great source of stress for the biotic community. The pollutants may cause lesions in the ti
Publicado em: 2004
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14. Metil e fenilfosfonatos de calcio-sintese, caracterização, intercalação de aminas alifaticas e calorimetria
Calcium phosphonates Ca(HO3PR)2.xH2O (x = 1 or 2 R = CH3 or C6H5) were synthesized through reaction in aqueous media between calcium and phosphonic acids. The aim was to intercalate n-alkylamines: methyl -, ethyl -, propyl -, butyl -, pentyl and octylamines into Ca(HO3PC6H5)2.2H2O (CaPP1), Ca(HO3PCH3)2.H2O (CaPM) in aqueous media and the anhydrous Ca(HO3PC6H
Publicado em: 2000
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15. Avaliação das condições de crescimento direcional do material composito in situ SnSe-SnSe2
The Sn-Se eutectic solidification allows one to obtain a lamellar structure, formed by SnSe and SnSe2 compounds, which are p and n semiconducting types, respectively. The SnSe-SnSe2 eutectic composite is a promising material to be used in photovoltaic device manufacturing. In this work, the Sn-Se alloy corresponding to eutectic composition was studied by usi
Publicado em: 1998
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16. Estudo de compostos de intercalação de Fe OCI : sintese, caracterização e propriedades
In this study we have synthetised FeOCl and some of its intercalation compounds involving Lewis bases as intercalants: n-buthylamine (nBA), triethylamine (TEA), benzylamine (BZA), ethylenediamine (EDA) and diethylenetriamine (DTA). These synthesis were optimized through the control of some reaction parameters such as temperature and time. The reactions were
Publicado em: 1997
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17. Ectothiorhodospira mobilis Pelsh, a Photosynthetic Sulfur Bacterium Depositing Sulfur Outside the Cells1
From salt flats on the Galapagos Islands, two strains of a red photosynthetic bacterium were isolated and identified as Ectothiorhodospira mobilis, an organism first described by Pelsh in 1937. The cells are curved in a short spiral, 0.7 to 1.0 μ wide and 2.0 to 4.8 μ long. They are motile by a polar tuft of flagella. Cells contain several large stacks of
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18. Near-infrared-emissive polymersomes: Self-assembled soft matter for in vivo optical imaging
We demonstrate that synthetic soft materials can extend the utility of natural vesicles, from predominantly hydrophilic reservoirs to functional colloidal carriers that facilitate the biomedical application of large aqueous-insoluble compounds. Near-infrared (NIR)-emissive polymersomes (50-nm- to 50-μm-diameter polymer vesicles) were generated through coope
National Academy of Sciences.
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19. The effects of ethylene oxide containing lipopolymers and tri-block copolymers on lipid bilayers of dipalmitoylphosphatidylcholine.
A comparative study is conducted on the influence of two types of polymeric compounds on the phase behavior of 1,2-dihexadecanoyl-s,n-glycero-3-phosphotidylcholine (DC16PC) lipid bilayers. The first polymeric compound is a lipopolymer, with two different lengths of a hydrophilic polyethylene oxide moity, anchored to the bilayer by a 1,2-dioctadecanoyl-s,n-gl
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20. Inhibition of glutathione synthesis in the newborn rat: a model for endogenously produced oxidative stress.
A model for oxidative stress is described in which glutathione (GSH) synthesis is selectively blocked in newborn rats by administration of L-buthionine-(S,R)-sulfoximine (BSO). In this model, the normal endogenous physiological formation of reactive oxygen species is largely unopposed, and therefore oxidative tissue damage occurs; because GSH is used for red
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21. Characterization of cotJ, a sigma E-controlled operon affecting the polypeptide composition of the coat of Bacillus subtilis spores.
The outermost protective structure found in endospores of Bacillus subtilis is a thick protein shell known as the coat, which makes a key contribution to the resistance properties of the mature spore and also plays a role in its interaction with compounds able to trigger germination. The coat is organized as a lamellar inner layer and an electron-dense outer