ORNL researcher Natalie Griffiths (IMAGE) DOE/Oak Ridge National Laboratory Caption Aquatic ecologist Natalie Griffiths conducts studies on nutrients and contaminants in the Walker Branch Watershed, which flows through the Oak Ridge National Environmental Research Park. Credit Carlos Jones/ORNL, U.S. Dept. of Energy Usage Restrictions No restrictions on use 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.