title: Displacement current on purple membrane fragments oriented in a suspension.
abstract: The displacement current is measured in a suspension of electric field-oriented purple membranes isolated from Halobacterium halobium, the photocycle being driven by a light flash. A simple quantitative theory of the method is presented and used to evaluate the distances the protons move during their way through the bacteriorhodopsin molecules. A lower limit of the velocity of proton movement is also given.
mesh_terms: D001436:Bacteriorhodopsins / Q000502:physiology*; D002338:Carotenoids / Q000502:physiology*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004553:Electric Conductivity; D006217:Halobacterium / Q000502:physiology / Q000648:ultrastructure; D008027:Light; D011522:Protons
chemical_list: D011522:Protons; D002338:Carotenoids; D001436:Bacteriorhodopsins