Uranium (IMAGE) University of California - Davis Caption These spherical clusters are made up of uranium and oxygen atoms. New work shows that in seawater, they can remain stable in solution or as nanoparticles. Credit Ginger Sigmon, University of Notre Dame Usage Restrictions Credit required 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.