Biocatalyst iron nitrogenase (IMAGE) Max-Planck-Gesellschaft Caption It has recently been shown that the biocatalyst iron nitrogenase not only fixes nitrogen, but also carbon dioxide. However, this nitrogenase form has so far been the least studied. Now two proteins have been identified that are crucial for the energy supply of the enzyme. Credit Max Planck Institute for Terrestrial Microbiology/Geisel Usage Restrictions Use of images is limited to editorial coverage of scientific topics relating to the activities of the Max Planck Society. Any kind of commercial use (including, in particular, the exploitation of images by means of sale or incorporation in image databases or image catalogues) as well as any promotional use/use for merchandise purposes, disclosure to third parties or granting of related rights to third parties is expressly not permitted. 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.