Enzymes (image) Bielefeld University Caption Students at Bielefeld University have developed synthetic enzymes and applied them to tiny glass beads. They now filter the test solution like a gravel bed - the darker they become, the better the synthetic biofilter. Credit iGEM-Team Bielefeld-Germany Usage Restrictions The image may only be used with appropriate caption or credit. 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.