2.7.7.18 55 - 5 min 54% loss of activity 2.7.7.18 60 - 5 min 39% loss of activity 2.7.7.18 60 - 5 min 95% loss of activity 2.7.7.18 65 - 5 min 65% loss of activity 2.7.7.18 70 - 45 min, no loss of activity