15N15N Experiment (IMAGE) Rice University Caption Researchers from Rice University and UCLA simulated high-energy chemistry in the upper atmosphere to reproduce enriched levels of 15N15N, molecules that contain only heavy isotopes of nitrogen. Credit Laurence Yeung/Rice University Usage Restrictions Must credit: "Laurence Yeung/Rice 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.