Figure 1. Aerobic and anaerobic metabolites produced by A. actinomycetemcomitans, A. actinomycetemcomitans lctD ^- and A. actinomycetemcomitans cydB ^-.

Resting cell suspensions of each culture were incubated (A )aerobically in glucose; (B), anaerobically in glucose; (C), aerobically or anaerobically in lactate. Metabolite concentrations were measured by HPLC. Data in A and B is presented as moles of metabolite produced/mole of glucose consumed. Only trace concentrations (<50 µM) of ethanol were observed in anaerobic suspensions. Error bars represent 1 standard error of the mean, n = 3. * Acetate concentrations are shown per mM of L-lactate consumed. The detection limit for acetate was 100 µM.