Biomineralization of Gold: Biofilms on Bacterioform Gold

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Science  14 Jul 2006:
Vol. 313, Issue 5784, pp. 233-236
DOI: 10.1126/science.1125878

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Bacterial biofilms are associated with secondary gold grains from two sites in Australia. 16S ribosomal DNA clones of the genus Ralstonia that bear 99% similarity to the bacterium Ralstonia metallidurans—shown to precipitate gold from aqueous gold(III) tetrachloride—were present on all DNA-positive gold grains but were not detected in the surrounding soils. These results provide evidence for the bacterial contribution to the authigenic formation of secondary bacterioform gold grains and nuggets.

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