Abstract
The temperature dependence of the longitudinal relaxation time, T 1 for various protons in sonicated dipalmitoyllecithin vesicles at 60 and 220 MHz are compared. In order to qualitatively explain the frequency dependence of T 1 values the anisotropy of motion of individual protons in the phospholipid molecule must be explicitly taken into account. The difficulties in interpreting NMR relaxation times in terms of specific motions in the phospholipid molecule are discussed.
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