TABLE 3.

Half-lives of activities of psychrophilic, mesophilic, and thermophilic OTCases

Organism	Temp (°C)	Half-lifea in the following buffer (pH):
		Potassium phosphate (7.0)	PIPES-NaOH (7.0)	Tris HCl (7.5)
M. abyssi	50	60	14	9
	55	40	4.5	3
	60	2
E. coli	68	43b		5
P. furiosus	100	65	60	40

^aReported in minutes.

^bValue was determined with 10 mM potassium phosphate in 300 mM Tris HCl (pH 8.0).