Biosynthesis of CACO3 Crystals of complex morphology using a fungus and an actinomycete

Debabrata Rautaray, Absar Ahmad, Murali Sastry

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The biosynthesis of CaCO3 by reaction of aqueous Ca2+ ions with a fungus, Fusarium sp., and an actinomycete, Rhodococcus sp. (both plant organisms), is described. In the case of the fungus, cruciform-shaped calcite crystals are obtained (SEM picture A) while the actinomycete yielded the unstable polymorph of CaCO3, vaterite (SEM picture B). Specific proteins secreted by the microorganisms are responsible for the morphology and crystallography control observed. A highlight of this approach is that the microorganisms also provide CO2 for reaction with the Ca2+ ions, making the crystals completely biogenic.

Original languageEnglish
Pages (from-to)14656-14657
Number of pages2
JournalJournal of the American Chemical Society
Issue number48
Publication statusPublished - 3 Dec 2003
Externally publishedYes

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