How Nitrogen-Fixing Bacteria Sense Iron (IMAGE) University of East Anglia Caption University of East Anglia research reveals how nitrogen-fixing bacteria sense iron -- an essential but deadly micronutrient. Credit University of East Anglia 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.