1.10.3.3 3.6 - loss of 80% activity after 30 min at 0°C 1.10.3.3 4 - irreversible loss of activity below 1.10.3.3 5 9 - 1.10.3.3 5 10 rapid loss of activity below pH 4 and above pH 12 1.10.3.3 5 8 - 1.10.3.3 6 10 at 30°C