The occurrence of sulfur and phosphorus within bacterially derived crystalline and pseudocrystalline octahedral gold formed in vitro

Details The occurrence of sulfur and phosphorus within bacterially derived crystalline and pseudocrystalline octahedral gold formed in vitro The occurrence of sulfur and phosphorus within bacterially derived crystalline and pseudocrystalline octahedral gold formed in vitro

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.4369s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 60, Issue 22, pp.4369-4376

Computer Science

7

Scientific paper

A temperature study (4°C, room temperature, 60°C and 90°C) employing a bacterial in vitro model (Southam and Beveridge, 1994) revealed a role for S and P in octahedral An formation. Ionic Au immobilized by Bacillus subtilis 168 was first precipitated as colloidal Au. During diagenesis, these colloids were transformed into spherical pseudocrystalline gold particles composed of 74.56 ± 2.60 at% Au, 8.56 ± 1.71 at% S, and 13.94 ± 1.48 at% P. These minerals then aggregated as roughly shaped noncrystalline octahedral Au which was subsequently transformed into crystalline octahedral Au containing 85.37 ± 0.16 at% Au (the maximum detected[, 0.77 ± 1.33 at% S, and 10.27 ± 0.88 at% P. The strong P signals (13.39 ± 2.01 average at%[ obtained from the Au minerals examined by energy-dispersive X-ray spectroscopy suggest that organic phosphate compounds also play a role in the in vitro development of octahedral Au, possibly as bacteria-Au-complexing agents. Increasing the time to 4 weeks at room temperature or the temperature to either 60°C or 90°C enhanced formation of the crystalline octahedral gold. This crystalline octahedral Au generated an electron diffraction pattern consistent with synthetic Au.

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