Serratia marcescens biofilms (IMAGE) Syracuse University Caption Serratia marcescens biofilms grown on soft (left) and stiff (right) polyacrylamide (PAA) hydrogels. These images reveal the conclusion that biofilms grow faster as substrate stiffness increases. Credit Syracuse University Usage Restrictions None License Original 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.