Table 1.

Average order parameters, ${\overline{S}}_{CD}$, derived from ²H NMR spectra

Membrane	${\overline{S}}_{CD}$
	No Cer	Cer 6:0 (1:10)	Cer 18:1 (1:10)
POPC-d31	0.136	0.150	0.162
POPS-d31	0.172	0.163	0.174
	No Cer (1:20)	Cer 6:0 (1:1:20)	Cer 18:1 (1:1:20)
POPS/POPC-d31	0.143	0.142	0.148
POPS-d31/POPC	0.146	0.146	0.149

Order parameters are presented for POPC-d₃₁ in POPC and POPS-d₃₁ in POPS in the absence of ceramide and in the presence of Cer 6:0 and Cer 18:1 (1:10), and for POPC-d₃₁ and POPS-d₃₁ in mixed POPS/POPC (1:20) vesicles in the absence of ceramide and in the presence of Cer 6:0 and Cer 18:1 (1:1:20 mol) at 30°C.