Rosette Sampler (IMAGE) University of Oldenburg Caption So-called rosette samplers are used to take water samples at different water depths. The Oldenburg team analyzed the distribution of dissolved organic matter in the Black Sea. Credit © Nelli Sergeeva Usage Restrictions The image may only be used with appropriate caption and credit and only related to the content of this press release. 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.