Bacterial Indicator Plate (IMAGE) Georgia Institute of Technology Caption A plate containing E. coli shows a purple pigment in response to levels of zinc. The bacterium could be used to detect nutritional deficiencies in resource-limited areas of the world. Purple would indicate low levels of the micronutrient. Credit Credit: Rob Felt, Georgia 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.