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Effect of fumarate and/or hydrogen on fermentative growth of wild-type D. vulgaris on pyruvate. Growth was in WP medium containing pyruvate (30 mM) and no sulfate. Fumarate (34 mM) was added where indicated. Addition of hydrogen was done by changing the headspace gas from 90% (vol/vol) N2-10% CO2 to 80% (vol/vol) H2-20% CO2. Cell density is plotted as a function of time.
