Pulse-chase Experiment (IMAGE) Colorado State University Caption The research team used a pulse-chase experiment, a technique to focus on the manure's effect on whole ecosystems. Credit Carl Wepking/CSU 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.