Core/Shell Nanoparticles (image) University at Buffalo Caption This is a transmission electron microscopy image of nanoparticles designed for deep-tissue imaging. Each particle consists of a core encased inside a square, calcium-fluoride shell. Credit Photo credit: Zhipeng Li Usage Restrictions This image may only be used in conjunction with news stories reporting on the associated research. 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.