Abstract
Experimental proof is presented that some of the motions responsible for transverse relation (T/sub 2/) in deuterium magnetic resonance (/sup 2/H NMR) experiments on acyl chains of a model membrane in the liquid-crystalline phase are extremely slow on the /sup 2/H NMR time scale being characterized by a correlation time tau/sub 2/ >> 10/sup -5/ s. The experiments used to investigate these slow motions involve a form of the Carr-Purcell-Meiboom-Gill pulse sequence modified so as to be suitable for /sup 2/H NMR. The most plausible mechanism responsible for T/sub 2/ relaxation is the gradual change in the average molecular orientation due to lateral diffusion of the phospholipid molecules along curved membrane surfaces. A procedure for separating contributions to T/sub 2/ relaxation due to slow and fast motions is described.
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