Gold Nanoparticle (image) University of Missouri-Columbia Caption The nanoparticle that Robertson's research team created is multi-layered. At the core lies the element, actinium, surrounded by four layers of material. Robertson's team then coated the nanoparticle with gold. Credit J. David Robertson/University of Missouri Usage Restrictions None 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.