Precipitated Calcium Carbonate
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Biomineralization processes of calcite induced by bacteria isolated from marine sediments
Biomineralization is a known natural phenomenon associated with a wide range of bacterial species. Bacterial-induced calcium carbonate precipitation by marine isolates was investigated in this study. Three genera of ureolytic bacteria, Sporosarcina sp., Bacillus sp. and Brevundimonas sp. were observed to precipitate calcium carbonate minerals. Of these speci
Braz. J. Microbiol.. Publicado em: 2015-06
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2. Effect of culture medium on biocalcification by Pseudomonas Putida, Lysinibacillus Sphaericus and Bacillus Subtilis
The objective of this study is to investigate the efficiency of calcium carbonate bioprecipitation by Lysinibacillus sphaericus, Bacillus subtilis and Pseudomonas putida, obtained from the Coleção de Culturas do Instituto Nacional de Controle de Qualidade em Saúde (INCQS), as a first step in determining their potential to protect building materials agains
Brazilian Journal of Microbiology. Publicado em: 2011-06
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3. Estudo de condições operacionais para obtenção de carbonato de cálcio precipitado
O carbonato de cálcio pode ser encontrado na natureza na forma de calcário, conhecido como carbonato de cálcio natural (CCN), ou pode ser produzido por reações químicas, formando o carbonato de cálcio precipitado (CCP). O CCP e um produto mais puro e exibe um maior brilho e opacidade que o CCN. A produção industrial do CCP envolve os seguintes proce
Publicado em: 2008
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4. Processamento de carbonato de cálcio para aplicação nas indústrias de papel e de plástico
This work presents the experimental results for precipitated calcium carbonate (PCC) synthesis over a ground calcium carbonate (GCC) substrate. The parameters [Ca]/[CO3]T initial ratio, aqueous synthesis solution temperature, pH and coagulant concentration (EDTA) were investigated. The samples were characterized by scanning electron microscopy (SEM), total c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/03/2005
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5. Procedimento alternativo de preparaÃÃo de carbonato de cÃlcio precipitado de elevada pureza / Procedure alternative of preparing precipitated calcium carbonate based on calcium of high purity final product.
This work presents a method for preparing Precipitated Calcium Carbonate based on Calcium Oxide dissolution in aqueous solution of Monoethanolamine Hydrochloride, followed, by Calcium Carbonate Precipitation after carbonation with Carbon Dioxide of the resulting solution. This method allows the use of any limestone raw material, independent of the initial co
Publicado em: 1995
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6. Strain-Specific Ureolytic Microbial Calcium Carbonate Precipitation
During a study of ureolytic microbial calcium carbonate (CaCO3) precipitation by bacterial isolates collected from different environmental samples, morphological differences were observed in the large CaCO3 crystal aggregates precipitated within bacterial colonies grown on agar. Based on these differences, 12 isolates were selected for further study. We hypo
American Society for Microbiology.
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7. Isolation of an acidic protein from cholesterol gallstones, which inhibits the precipitation of calcium carbonate in vitro.
In seeking to identify nucleating/antinucleating proteins involved in the pathogenesis of cholesterol gallstones, a major acidic protein was isolated from each of 13 samples of cholesterol gallstones. After the stones were extracted with methyl t-butyl ether to remove cholesterol, and methanol to remove bile salts and other lipids, they were demineralized wi
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8. Conservation of Ornamental Stone by Myxococcus xanthus-Induced Carbonate Biomineralization
Increasing environmental pollution in urban areas has been endangering the survival of carbonate stones in monuments and statuary for many decades. Numerous conservation treatments have been applied for the protection and consolidation of these works of art. Most of them, however, either release dangerous gases during curing or show very little efficacy. Bac
American Society for Microbiology.