Microbial Life on Earth, Metabolism, and Metabolic Diversity -- A Microbe's Environment and Natural Selection -- Microbial Energetics -- Catabolism and Its Coupling to Anabolism -- Microbial Kinetics -- Mechanisms of Microbial Energy Conservation -- Prototypic Reactions of Prokaryotic Carbon Catabolism -- Metabolic Modules, Pathways, and Nodes of Intermediates -- Fermentative Metabolism -- Prototypic Reactions, Modules, and Pathways of C1 Catabolism.