Peter Vekilov and Dimitra Georgiou (IMAGE) University of Houston Caption Peter Vekilov, associate professor of chemical engineering, and Dimitra Georgiou, a recent doctoral graduate in chemical engineering, work with an atomic-force microscope to capture images of insulin molecules only five nanometers in diameter. Credit Jeff Shaw Usage Restrictions None 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.