1.3.1.14 5.5 7.8 pH 5.5: 13% of the activity at pH 6.5 390562 1.3.1.14 5.5 7.8 pH 7.8: 65% of the activity at pH 6.5 390562 1.3.1.14 6.4 8.9 below and above the turnover number decreases 390568 1.3.1.14 6.5 - 70% of maximal activity, dihydrorotate oxidase reaction 701809