3.4.23.18 40 - below, stable 30560 3.4.23.18 60 - 20 min, at pH 2.8, complete inactivation 30560 3.4.23.18 55 - up to, stable, at pH 3.8 30561 3.4.23.18 50 - up to, stable, at pH 3.8 30563 3.4.23.18 20 25 pH 2.7, 16 h stable 30564 3.4.23.18 30 - pH 7, drastic decrease of activity probably due to autolytic activity 30564 3.4.23.18 55 - 20 min, complete inactivation at pH 5.5, Ca2+ does not protect 30564 3.4.23.18 55 - 10 min, in 50 mM sodium acetate buffer, pH 5 30569, 30570, 30575 3.4.23.18 55 - isozyme A1 loses 10% of its original activity in contrast to almost complete loss of activity of isozyme A2 30569 3.4.23.18 55 - isozyme F1 retains 70%, F2 85% of original activity 30570