Bacterial culture (IMAGE) University of Oldenburg Caption Microscopic image of a co-culture of the two strains of bacteria. The blue colouring shows bacteria, the red dots are viruses. They cause some bacterial cells to break up, releasing the vitamin into the water. Credit Wienhausen et al., Nature Usage Restrictions The image should only be used in articles specifically about the paper and should not be kept on file. 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.