Figure 6.

Supplementation of exogenous propionate resulted in decreased supernatant hemolytic activities under aerobic conditions (A) but increased supernatant hemolytic activities under anaerobic conditions (B). A hly promoter driven reporter strain, when grown aerobically, produced less fluorescence in the presence of propionate. When grown anaerobically, it produced more fluorescence in the presence of propionate (C). Hemolytic activities were normalized by culture optical densities measured at 600 nm. Averages of triplicates were plotted with error bars representing standard deviations. Results represent three independent experiments. “*” indicates p values between 0.05 and 0.01.