Deb Jaisi, University of Delaware (IMAGE) University of Delaware Caption Deb Jaisi, an assistant professor of plant and soil sciences at the University of Delaware, is working to seek out the sources of a key nutrient so excessive that it has become a pollutant in the Chesapeake Bay -- phosphorus. Credit Kathy F. Atkinson/University of Delaware Usage Restrictions Credit required 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.