SENSORS 4 (IMAGE) Rice University Caption Rice University postdoctoral researcher Xu Zhang prepares a water sample for testing with programmable bacteria that test for contaminants and release an electronic signal for detection in real time. Credit Brandon Martin/Rice University Usage Restrictions NONE License Original 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.