<i>Nitrososphaera viennensis</i> (IMAGE) University of Vienna Caption A single Nitrososphaera viennensis cell has a diameter of just 0.8 micrometers. Credit University of Vienna, Department Genetics in Ecology Usage Restrictions Image may only be used with appropriate credit. 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.