Silver Nanoparticles (IMAGE) University of Pittsburgh Caption A depiction of hyper-motile E.coli, a strain of bacteria found to resist silver nanoparticles' antimicrobial properties after repeated exposure. Credit Lisa Stabryla/University of Pittsburgh. Usage Restrictions Include credit. 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.