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Science 1 December 2000:
Vol. 290. no. 5497, pp. 1711 - 1712
DOI: 10.1126/science.290.5497.1711
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Perspectives

BIOGEOCHEMISTRY:
Sulfate Reducers--Dominant Players in a Low-Oxygen World?

Crisogono Vasconcelos and Judith A. McKenzie

Sulfate reducing bacteria can adapt to extreme physical and chemical conditions and play an important role in global geochemical cycles, but their role in the formation of ore deposits has remained controversial. Strong support for such a role is provided by Labrenz et al., who have discovered sulfate-reducing bacteria that can tolerate low levels of oxygen and can precipitate zinc sulfide minerals. The results may have implications for bioremediation and may provide clues to processes that may have been more widespread in the geologic past.

The authors are at the Geological Institute, Eidgenössische Technische Hochschule-Zentrum, 8092 Zürich, Switzerland. E-mail: chris.vasconcelos{at}erdw.ethz.ch

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Geochemical Modeling of ZnS in Biofilms: An Example of Ore Depositional Processes.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)