Understanding Antibacterial Resistance (IMAGE) Iowa State University Caption Iowa State University's Edward Yu, right, shows electron density maps of a pump that removes heavy metal toxins from bacteria. With him are post-doctoral researchers Chih-Chia Su, left, and Feng Long. Credit Photo by Bob Elbert/Iowa State University 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.