Jessie Kwan Long-ching and Zhao Guochun (IMAGE) The University of Hong Kong Caption Miss Jessie Kwan Long-ching (left), under the supervision of Professor Zhao Guochun, conducts her research with the aid of the Electron Probe Micro-Analyzer (EPMA). Credit The University of Hong Kong 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.