5.3.1.8 4 - 83% of maximum activity 749059 5.3.1.8 5.5 9 about 50% of maximal activity at pH 5.5 and pH 9.0 2810 5.3.1.8 6 11 pH 6.0: 50% of maximal activity, relative high activity up to pH 11 2813 5.3.1.8 6.3 8.8 more than 50% of maximum activity in this range 661679 5.3.1.8 6.5 8.5 - 701797, 702817, 714372 5.3.1.8 6.5 9 activity range 701472 5.3.1.8 9 - 94% of maximum activity 749059