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Extracellular Iron-Sulfur Precipitates From Growth of Desulfovibrio desulfuricans
Published online by Cambridge University Press: 10 February 2011
Abstract
We have examined extracellular iron-bearing precipitates resulting from the growth of Desulfovibrio desuyfuricans in a basal medium with lactate as the carbon source and ferrous sulfate. Black precipitates were obtained when D. desulfuricans was grown with an excess of FeSO4. When D. desulfuricans was grown under conditions with low amounts of FeSO4, brown precipitates were obtained. The precipitates were characterized by iron K-edge XAFS (x-ray absorption fine structure), 57Fe Mössbauer-effect spectroscopy, and powder x-ray diffraction. Both were noncrystalline and nonmagnetic (at room temperature) solids containing high-spin Fe(III). The spectroscopic data for the black precipitates indicate the formation of an iron-sulfur phase with 6 nearest S neighbors about Fe at an average distance of 2.24(1) Å, whereas the brown precipitates are an iron-oxygen-sulfur phase with 6 nearest O neighbors about Fe at an average distance of 1.95(1) Å.
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- Copyright © Materials Research Society 2000