The reaction cascade (IMAGE) Max Planck Institute for Marine Microbiology Caption The cascade of chemical reaction starting from sulfate (SO42-) to sulfide (H2S). Credit Marion Jespersen / Max Planck Institute for Marine Microbiology Usage Restrictions Only to be used in the context of this publication and citing the correct copyright. License Original 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.