Diatoms and Paris Street Gutters (IMAGE) CNRS Caption These are diatoms and Paris street gutters Credit Pascal Jean Lopez / BOREA Biology of Aquatic Organisms and Ecosystems Research Unit (CNRS / MNHN / IRD / UPMC / University of Caen / Université des Antilles). 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.