FIG. 2.
CAT (A) and AD (B) activities of mutants of S. gordonii carrying ParcA-cat and its derivatives (Table 1) cultured in TY broth containing 25 mM galactose with 20 mM arginine under aerobic or anaerobic conditions to mid-exponential phase. The values of the columns are the average of a minimum of nine separate cultures for each strain and condition. (A) The standard deviations for CAT activities of the aerobic group from left to right are 25.00, 10.13, 18.14, 19.28, 7.04, 3.60, and 7.81; those of the anaerobic group from left to right are 34.12, 3.60, 44.30, 6.36, 38.95, 2.51, and 24.13. (B) The standard deviations for AD activities of the aerobic group from left to right are 5.20, 0.50, 2.40, 2.61, 3.23, 15.23, and 1.78; those of the anaerobic group from left to right are 5.17, 1.11, 1.89, 9.79, 1.29, 1.28, and 7.78. Activities: ▪, aerobic cultures; □, anaerobic cultures. *, statistically significant differences between SgWT and mutants grown under identical culture conditions (P < 0.05 [Student t test]).