Anelastic spectroscopy as a probe of dynamic properties in lipid membranes

Two relaxation processes have been observed at about 200 and 140 K in mixtures of cationic and neutral lipids, which are due to a dynamics in the membrane plane on time scales accessible to anelastic spectroscopy. The presence of the two processes appears to be a general phenomenon independent of the lipid type, and is connected to the motion of lipids and lipid domains in the membrane plane.