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Science 7 March 2008:
Vol. 319. no. 5868, p. 1335
DOI: 10.1126/science.319.5868.1335a
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Letters
How to Submit a Letter to the Editor
Technical Comment Abstracts
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COMMENT ON "Early Archaean Microorganisms Preferred Elemental Sulfur, Not Sulfate"
Huiming Bao, Tao Sun, Issaku Kohl, Yongbo Peng
Abstract: Philippot et al. (Reports, 14 September 2007, p. 1534) interpreted multiple-sulfur isotopic compositions of ~3.5-billion-year-old marine sulfide deposits as evidence that early Archaean microorganisms were not sulfate reducers but instead metabolized elemental sulfur. However, their data can be better explained by a scenario involving poor mixing of photochemical and surface sulfide sources.
Full text at www.sciencemag.org/cgi/content/full/319/5868/1336b
RESPONSE TO COMMENT ON "Early Archaean Microorganisms Preferred Elemental Sulfur, Not Sulfate"
Pascal Philippot, Mark Van Zuilen, Kevin Lepot, Christophe Thomazo, James Farquhar, Martin J. Van Kranendonk
Abstract: Our knowledge of the sulfur cycle on early Earth is still in its infancy. Nevertheless, there exist enough geochemical constraints from the rock record to show that the theoretical mixing models proposed by Bao et al. are highly unlikely to account for the range of  34S and  33S values recorded for the microscopic sulfides at the North Pole.
Full text at www.sciencemag.org/cgi/content/full/319/5868/1336c
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