Image 2 (IMAGE) Nanyang Technological University Caption Headshot of Assoc Prof Liu Quan from NTU's School of Chemical and Biomedical Engineering, who led the study. Credit NTU Singapore Usage Restrictions NTU Singapore 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.