SUMMARY: Out of 19 strains belonging to the family only and strains fermented fumarate exclusively to succinate. This fermentation was dependent on the presence of molecular hydrogen or formate. The inability of these micro-organisms to convert fumarate to succinate, acetate and CO correlated with their lack, or low activity, of oxaloacetate decarboxylase.

Continuous culture experiments were performed with in minimal or complex medium with fumarate + H or formate, and the growth parameters were determined. From the data obtained, a value of g dry wt per mol fumarate dissimilated was calculated. This value demonstrates that, per mol fumarate reduced, at least 0.6 ± 0.05 mol ATP is produced and subsequently used for biosynthetic purposes.


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