Consulta: creatorFacets:"Liu,Hao"
Registros recuperados: 2
Data/hora: 09/06/2024 13:23:48

Biomineralization processes of calcite induced by bacteria isolated from marine sediments
Provedor de dados: 58
Autores: Wei,Shiping; Cui,Hongpeng; Jiang,Zhenglong; Liu,Hao; He,Hao; Fang,Nianqiao.
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...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium carbonate precipitation; Calcite; Marine bacteria; Urease.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000200455

Microbiologically induced deterioration of concrete: a review
Provedor de dados: 58
Autores: Wei,Shiping; Jiang,Zhenglong; Liu,Hao; Zhou,Dongsheng; Sanchez-Silva,Mauricio.
Microbiologically induced deterioration (MID) causes corrosion of concrete by producing acids (including organic and inorganic acids) that degrade concrete components and thus compromise the integrity of sewer pipelines and other structures, creating significant problems worldwide. Understanding of the fundamental corrosion process and the causal agents will help us develop an appropriate strategy to minimize the costs in repairs. This review presents how microorganisms induce the deterioration of concrete, including the organisms involved and their colonization and succession on concrete, the microbial deterioration mechanism, the approaches of studying MID and safeguards against concrete biodeterioration. In addition, the uninvestigated research area of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial deterioration; Concrete corrosion; Biogenic sulfuric acid.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000400001