Journal
ISME JOURNAL
Volume 4, Issue 7, Pages 922-932Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ismej.2010.17
Keywords
amorphous calcium phosphate; precursor; nanoparticles; C. marismortui
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Funding
- Spanish Ministry of Education and Science [CGL2009-09249]
- Junta de Andalucia RNM [208, 179, 270]
- Office Of The Director
- EPSCoR [814251] Funding Source: National Science Foundation
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Although diverse microbial metabolisms are known to induce the precipitation of carbonate minerals, the mechanisms involved in the bacterial mediation, in particular nucleation, are still debated. The study of aragonite precipitation by Chromohalobacter marismortui during the early stages (3-7 days) of culture experiments, and its relation to bacterial metabolic pathways, shows that: (1) carbonate nucleation occurs after precipitation of an amorphous Ca phosphate precursor phase on bacterial cell surfaces and/or embedded in bacterial films; (2) precipitation of this precursor phase results from local high concentrations of PO43- and Ca2+ binding around bacterial cell envelopes; and (3) crystalline nanoparticles, a few hundred nanometres in diametre, form after dissolution of precursor phosphate globules, and later aggregate, allowing the accretion of aragonite bioliths. The ISME Journal (2010) 4, 922-932; doi:10.1038/ismej.2010.17; published online 25 February 2010
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