Any material, of stainless steel to the liposomes, the polymer prostheses to carbon fibres interacts with its environment by its surface. Adhesion, corrosion, lubrication, the electrical contact, the biocompatibility or damping are as many current phenomena controlled by surface effects. The alive systems, them also, are the seat of innumerable phenomena of interface located in the lipidic bilayers or on the external surface of proteins.