Sai Ma and Chang Lu, Virginia Tech (IMAGE) Virginia Tech Caption Sai Ma, former Virginia Tech biomedical engineering Ph.D. student, and Chang Lu, the Fred W. Bull professor of Chemical Engineering at Virginia Tech. Credit Virginia Tech 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.