Fractionation of Stable Carbon Isotopes during Chemoautotrophic Growth of Sulfur-Oxidizing Bacteria.
Laboratory-grown strains of chemoautotrophic Thiomicrospira sp. strain L-12 and Thiobacillus neapolitanus produced cell carbon that was 24.6 to 25.1 ppt (24.6 to 25.1 mg/g) lower in C isotope abundance than the ambient source of carbon dioxide and bicarbonate. This degree of C isotope depletion was comparable to that found in organic material produced in deep-sea hydrothermal-vent communities.
Ruby
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Department of Biological Sciences, University of Southern California, Los Angeles, California 90089, and Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543.
Jannasch
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Deuser
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