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Anaerobic cultures were grown to log phase under anaerobic conditions at pH 5.5 (black bars), 7 (hatched bars), and 8 (white bars) and assayed for H2 consumption as described in the Materials and Methods. A negative value for H2 consumption means H2 is produced. H2 consumption rate was calculated as stated in the Materials and Methods. Error bars represent SEM, nā=ā3. The experiment was conducted twice.
