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Dark carbon dioxide fixation by Yellowstone Lake hydrothermal vent samples measured in triplicate (15°C) or duplicate incubations (50, 60, and 80°C) with (+S) or without addition of 5 mM thiosulfate. Biological fixation controls with added S + 20 μg/mL chloramphenicol (SC) were tested at 15°C only. UD, undetectable (<0.0005 μM C h−1); N/A, not available.
