1.13.11.28	-20	-	cannot be stored at -20°C except as ammonium sulfate precipitate or adsorbed to tricalcium phosphate gel	439515	
1.13.11.28	-	-	extremely labile, crude preparation loses 50% of activity within 3-4 h at pH 5.2	439515	
1.13.11.28	-	-	half-life of chloroplast enzyme is 8-9 h	439516	
1.13.11.28	55	-	complete inactivation after 20 min, addition of 0.006 mM substrate protects against inactivation for 15 min	439515