Mutualistic Fish (2 of 3) (IMAGE) Georgia Institute of Technology Caption Georgia Tech Postdoctoral Fellow Danielle Dixson measures the health of coral using pulse-amplitude-modulated (PAM) fluorometry that measures photosynthesis activity. Credit Georgia Tech Photo: Cody Clements 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.