Photosystem II (IMAGE) University of Würzburg Caption Three ruthenium atoms linked via specially shaped organic bonds make sure that the photosystem works more efficiently than its predecessors. Credit Graphic: Valentin Kunz & Marcus Schulze Usage Restrictions None 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.