4.1.1.11 3 9 activity range, profile overview 4.1.1.11 4 9 activity range, profile overview 4.1.1.11 4 7.5 pH 4.0: about 40% of maximal activity, pH 7.5: about 45% of maximal activity 4.1.1.11 4 11 activity range, profile overview 4.1.1.11 5 10 activity range, profile overview 4.1.1.11 5.3 8.6 half-maximal activity at pH 5.3 and at pH 8.6