Elemental Analysis (IMAGE) University of California - Santa Cruz Caption Elemental mapping analysis of the nanostructured composite material showed individual ruthenium atoms within the carbon matrix (red arrows). Researchers found that the main sites of catalytic activity were single ruthenium atoms rather than ruthenium nanoparticles. Credit Lu <em>et al</em>., <em>Nature Communications</em> Usage Restrictions For use only with news coverage of this research 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.