ORNL principal investigator Baohua Gu (IMAGE) DOE/Oak Ridge National Laboratory Caption ORNL principal investigator Baohua Gu examines samples used in mercury analyses. Credit Rachel Brooks/ORNL, U.S. Dept. of Energy Usage Restrictions No restriction 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.