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Science 14 September 2007:
Vol. 317. no. 5844, pp. 1508 - 1509
DOI: 10.1126/science.1148137
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Perspectives

GEOCHEMISTRY:
New Players in an Ancient Cycle

Bo Thamdrup

Isotope data from Australia provide evidence for the existence of bacteria that used elemental sulfur in metabolic processes about 3.5 billion years ago.

The author is at the Nordic Center for Earth Evolution, Institute of Biology, University of Southern Denmark, 5230 Odense M, Denmark. E-mail: bot{at}biology.sdu.dk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)