Abstract
Saturation transfer spectroscopy is a nonlinear electron paramagnetic resonance method for detecting rotational diffusion of nitroxide spin labels on the microsecond timescale or slower. Various results on spin-labeled biological membranes are reviewed here. These studies include those on lipid motions in gel-phase phospholipid bilayers, on the dynamics of lipid-protein interactions, and on the rotational diffusion of spin-labeled transmembrane proteins. Certain methodological aspects are also discussed.
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