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Microbiologically induced calcite precipitation : ウィキペディア英語版 | Microbiologically induced calcite precipitation Microbiologically induced calcium carbonate precipitation (MICP) is a bio-geochemical process that induces calcium carbonate precipitation within the soil matrix. Biomineralization in the form of calcium carbonate precipitation can be traced back to the Precambrian period. Calcium carbonate can be precipitated in three polymorphic forms, which in the order of their usual stabilities are calcite, aragonite and vaterite. The main groups of microorganisms that can induce the carbonate precipitation are photosynthetic microorganisms such as cynobacteria and microalgae; sulfate-reducing bacteria; and some species of microorganisms involved in nitrogen cycle. Several mechanisms have been identified by which bacteria can induce the calcium carbonate precipitation, including urea hydrolysis, denitrification, sulphate production, and iron reduction. Two different pathways, or autotrophic and heterotrophic pathways, through which calcium carbonate is produced have been identified. There are three autotrophic pathways exist. However, all three pathways result in depletion of carbon dioxide and favouring calcium carbonate precipitation. In heterotrophic pathway, two metabolic cycles can be involved: the nitrogen cycle and the sulfur cycle. Several applications of this process have been proposed, such as remediation of cracks and corrosion prevention in concrete,〔Achal, V., Mukherjee, A., Goyal, S., Reddy, M.S. (2012). Corrosion prevention of reinforced concrete with microbial calcite precipitation. ACI Materials Journal, April, 157-163.〕 biogrout,〔Rong, H., Qian, C.X., Wang, R.X. (2011). A cementation method of loose particles based on microbe-based cement. Science China: Technological Sciences, 54(7), 1722-1729.〕 sequestration of radionuclides and heavy metals.〔Pingitore, N.E., Eastman, M.P. (1986). The coprecipitation of Sr2+ and calcite at 25 degrees C and 1 atm" ''Geochim. Cosmochim. Acta'' 50(10), 2195-2203.〕 == Metabolic pathways ==
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