Abstract
The temperature variation of the spectra of stearic acid spin labels has been investigated in oriented egg lecithin multibilayers. The temperature behavior is characterized by an effective value for the energy separation between trans and gauche conformations in the lipid chains. Comparison with bilayers containing cholesterol indicates that this effective energy is sensitive to intermolecular steric interactions. The large value for the effective gauche energy suggests that part of the lipid chains are in a relatively ordered state even in unsaturated lecithin systems.
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