FIG. 2.

(A) Effect of hydrogen on benzoate metabolism by S. aciditrophicus. Symbols: □ and ○, benzoate utilization and cyclohexane carboxylate production, respectively, in cultures receiving 10.1 kPa of hydrogen; ▪ and ●, benzoate production and cyclohexane carboxylate production, respectively, in cultures receiving 10.1 kPa of nitrogen. (B) Effect of acetate on benzoate metabolism by S. aciditrophicus. Symbols: □ and ○, benzoate utilization and cyclohexane carboxylate production, respectively, in cultures receiving 60 mM sodium acetate; ▪ and ●, benzoate production and cyclohexane carboxylate production, respectively, in cultures receiving 60 mM sodium chloride. The data are averages ± standard deviations based on triplicate microcosms.