Microbe of Metal (IMAGE) DOE/Pacific Northwest National Laboratory Caption Shewanella oneidensis MR-1 grows on iron oxide surfaces such as this hematite mineral. Credit Pacific Northwest National Laboratory Usage Restrictions Credit PNNL 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.