Lynda Williams, Rajeev Misra and Maitrayee Bose (image) Arizona State University Share Print E-Mail Caption ASU professors Lynda Williams and Rajeev Misra, together with Williams' former doctoral student Keith Morrison (not pictured), discovered how naturally occurring blue and green clays have antibacterial properties. The NanoSIMS instrument, managed by Maitrayee Bose (right), produced images showing how elements in the clays attack microbes. Credit Deanna Dent/ASU Usage Restrictions For use in connection with reportage on this discovery. Share Print E-Mail 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.