Abstract
Tracer experiments with HC 14OONa show a quantitative conversion of the carbon into C 14O 2. Methane is produced in about the amount expected if the hydrogen from formate is used to reduce CO 2. A trace of hydrogen can be detected, indicating an intermediate conversion of HCOOH to H 2 and CO 2. Since the rate of conversion of H 2 and CO 2 to CH 4 is greater than the rate of decomposition of formate, hydrogen does not accumulate in significant concentration. Evidence for production of methane from other substrates, in addition to formate, is presented.
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