Live PASL Cells (IMAGE) University of Pittsburgh Caption Researchers used pendant drop elastometry to compress and expand the biofilm that the PASL cells formed. Credit Tagbo Niepa / University of Pittsburgh Swanson School of Engineering 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.