Table 2. Summary of observed tryptophan fluorescence lifetimes and amplitudes for OmpX^HN and OmpX^M.

Protein	Refolding method	GdmHCl (M)	Lifetimes			Amplitudes			<τ>c	?2, c
			τ1	τ2	τ3	a1	a2	a3
OmpXHN	HSa	0	2.64	0.17	5.63	0.26	0.42	0.29	2.42	1.03
		6	1.90	1.85	3.70	0.56	0.32	0.16	1.32	1.08
	40b	0	2.79	2.93	5.87	0.33	0.35	0.30	2.83	1.07
		6	1.82	2.22	3.54	0.32	0.47	0.20	1.42	1.11
OmpXM	HSa	0	2.75	0.23	5.73	0.31	0.36	0.32	2.80	1.04
		6	1.82	1.99	3.45	0.30	0.49	0.19	1.32	1.07
	40b	0	2.87	2.89	5.93	0.34	0.36	0.29	2.82	0.99
		6	1.73	1.79	3.45	0.28	0.511	0.20	1.28	1.05
OmpXHN	Unfolded	8	1.91	2.11	3.60	0.29	0.45	0.24	1.55	1.10
OmpXM		8	1.83	2.15	3.57	0.29	0.43	0.26	1.59	1.04

^aRefolding by heat shock at 70°C for 3 min;

^bRefolding at 40°C for 3 h (slow folding);

^cAverage lifetime <τ> and goodness of fit to a three exponential decay function (χ²).