Anaerobes in the Recyling of Elements in the Biosphere * The Diversity of Energy Sources of Microorganisms * Mechanism of Hydrogen Activation * Reductive Activation of Aerobically Purified Desulfovibrio vulgaris Hydrogenase: Characterization of the Catalytic H Cluster * Iron-Sulfur Cluster Biosynthesis * Genes and Proteins Involved in Nickel Dependent Hydrogenase Expression * Genes and Genetic Manipulations of Dusulfovibrio * Function and Assembly of Electron Transport Complexes in Desulfovibrio vulgaris * Iron-Sulfur Proteins in Anaerobic Eukaryotes * Oxygen and Anaerobes * One-Carbon Metabolism in Methanogenic Anaerobes * Selenium-Dependent Enzymes from Clostridia * How the Diverse Physiological Potentials of Acetogens Determine their in situ Realities * Electron Transport System ni Acetogens * Microbial Inorganic Sulfur Oxidation: The APS Pathway * Reduction of Metals and Non-essential Elements by Anaerobes * Chemolithoautotrophic Thermophilic Iron (III)-Reducer * Electron Flow in Ferrous Biocorrosion