4.4.1.3	4	10	activity is independent of the pH between pH 4 and pH 10	34603	
4.4.1.3	5	7	more than 70% of maximum activity	716137	
4.4.1.3	6.5	9	pH 6.5: about 20% of maximal activity, pH 9.0: about 40% loss of activity	34607