1997l-211 active analysis artificial biologicaltransport biologiemoléculaire biology carrierproteins cellmembrane cellmembranes cells cellulartherapy congresses congrès cytochemistry cytology enzymes enzymology membranelipids membranepotentials membraneproteins membranes(biologie) membranes(biology) metabolism methodology molecularbiology physiology qh601b393b1980 qh601g334b1989 qh601g739m1997 research secretion technique ultrastructure