TABLE 1.

Parameters of spin-label motion in binary mixtures of egg yolk sphingomyelin (ESM) with different proportions of cholesterol or 7-DHC: Reorientation correlation times

Samples	Activation Energies	τ37°
	kJ/mol	ns
SM 83%, CHOL 17%	20.2	0.83
SM 66%, CHOL 34%	26.6	0.38
SM 59%, CHOL 41%	24.5	0.33
SM 50%, CHOL 50%	22.3	0.34
SM 40%, CHOL 60%	28.4	0.30
SM 83%, 7DHC 17%	20.3	1.00
SM 66%, 7DHC 34%	24.1	0.41
SM 59%, 7DHC 41%	23.4	0.30
SM 50%, 7DHC 50%	21.3	0.35
SM 40%, 7DHC 60%	20.6	0.40

Parameters are from the least-squares fittings of the following equation:

$$\tau ={\tau }_{37°}\text{exp}\left[\frac{\text{E}}{\text{R}}\left(\frac{1}{T}-\frac{1}{310}\right)\right]$$

Abbreviations: Chol, cholesterol; 7-DHC, 7-dehydrocholesterol; ESM, egg sphingomyelin.