From the contentsPreface.- Dedication.- Section I. Nitrogenase: The Origin, the Enzymes, and the Chemistry.- Section II. Genetics and Regulation in Heterotrophs and Photosynthetic Bacteria.- Section III. From Genomes to Function.- Section IV. Establishment of Symbiosis and Nodule Function.- Section V. Towards Sustainable Agriculture and Protection of the Environment.- Section VI. Molecular Ecology and the Discovery of New Nitrogen Fixers.- Author Index.