Proton Transport (IMAGE) Forschungsverbund Berlin Caption Proton transport in water, in which the excess H+ or OH- charge moves in steps. With the model system 7-hydroxyquinoline it is possible to define the direction of the charge transport. Credit MBI Usage Restrictions The image may only be used with appropriate caption and credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.