Tracking Nitrogen's Flow (IMAGE) Michigan State University Caption Amy Burgin, a Michigan State University PhD student, does gas sampling to track the flow of a non-radioactive nitrogen isotope in a stream that is part of the Kalamazoo River watershed in western Michigan. Credit Michigan State University Usage Restrictions With credit to Michigan State University 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.