  Diffusion processes in biological membranes are of interest to understand the
macromolecular organisation and function of several molecules. Fluorescence
Recovery After Photobleaching (FRAP) has been widely used as a method to
analyse this processes using classical Brownian diffusion model. In the first
part of this work, the analytical expression of the fluorescence recovery as a
function of time has been established for anomalous diffusion due to long
waiting times. Then, experimental fluorescence recoveries recorded in living
cells on a membrane-bound protein have been analysed using three different
models : normal Brownian diffusion, Brownian diffusion with an immobile
fraction and anomalous diffusion due to long waiting times.
