TABLE 3.

Pyrene excimerization rate constants in four opaque-transparent pairs of S. pneumoniae^a

Serotype	Excimerization rate constant (K)		% Differenceb	Lifetime (ns)
	Transparent	Opaque		Transparent	Opaque
6A	0.592 ± 0.040	0.474 ± 0.034	25	59.88	59.74
6B	0.475 ± 0.027	0.377 ± 0.018	26	63.53	64.78
18C	0.498 ± 0.075	0.404 ± 0.008	23	55.81	56.30
23F	0.302 ± 0.033	0.261 ± 0.026	16	53.31	58.69

^aValues represent the mean of at least five determinations in triplicate plus the standard deviation. P ≤ 0.05 for the difference between excimerization rate constants in opaque and transparent variants.

^bCalculated by the formula (K_Tr − K_Op)/K_Op × 100.