FIG 4.

Specific activities of PDH (A) and POX (B) of the L. brevis ATCC 367, Δpdh mutant, and Δpox mutant strains under anaerobic and aerobic conditions. POX activity was not detected in the anaerobic cultures in the early growth phase and the late growth phase (n.d.). The pdh gene was inactivated; therefore, the PDH activity in the Δpdh mutant was null. The pox gene was inactivated; therefore, the POX activity in the Δpox mutant was null. Early, early growth phase; Late, late growth phase. The values are means ± standard deviations of three independent experiments. Statistically significant difference is indicated by an asterisk (*, P < 0.05).