Data/hora: 08/06/2024 16:24:30

Provedor de dados: 	58	
País: 	Brazil	
Título: 	Biomineralization processes of calcite induced by bacteria isolated from marine sediments	
Autores: 	Wei,Shiping; Cui,Hongpeng; Jiang,Zhenglong; Liu,Hao; He,Hao; Fang,Nianqiao.	
Data: 	2015-06-01	
Ano: 	2015	
Palavras-chave: 	Calcium carbonate precipitation; Calcite; Marine bacteria; Urease.	
Resumo: 	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 species, Sporosarcina sp. dominated the cultured isolates. B. lentus CP28 generated higher urease activity and facilitated more efficient precipitation of calcium carbonate at 3.24 ± 0.25 × 10−4 mg/cell. X-ray diffraction indicated that the dominant calcium carbonate phase was calcite. Scanning electron microscopy showed that morphologies of the minerals were dominated by cubic, rhombic and polygonal plate-like crystals. The dynamic process of microbial calcium carbonate precipitation revealed that B. lentus CP28 precipitated calcite crystals through the enzymatic hydrolysis of urea, and that when ammonium ion concentrations reached 746 mM and the pH reached 9.6, that favored calcite precipitation at a higher level of 96 mg/L. The results of this research provide evidence that a variety of marine bacteria can induce calcium carbonate precipitation, and may influence the marine carbonate cycle in natural environments.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000200455	
Editor: 	Sociedade Brasileira de Microbiologia	
Relação: 	10.1590/S1517-838246220140533	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Microbiology  v.46 n.2 2015	
Fonte: 	info:eu-repo/semantics/openAccess