Biofilm Formation (IMAGE) Universität Bayreuth Caption Scanning electron microscope images give overwhelming proof of the difference. Left: A biofilm forms on the surface of polycaprolactone, a biodegradable plastic frequently used in medicine. Right: Spider silk does not allow for biofilm formation. Credit Images: Gregor Lang. 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.