Microbial Ecology Microorganisms in Nature Methods in Microbial Ecology Enrichment and isolation methods Identification and Quantification: Nucleic acid Probes, Fluorescent Antibodies, and Ⅴ iable counts Measurements of Microbial Activity in Nature Stable Isotopes and Their Use in Microbial Biogeochemistry Aquatic Habitats Terrestrial Environments Deep sea microbiology Hydrothermal Vents arbon cvcleMicrobial Ecology Microorganisms in Nature Methods in Microbial Ecology Enrichment and Isolation Methods Identification and Quantification: • Nucleic acid Probes, Fluorescent Antibodies, and Viable Counts Measurements of Microbial Activity in Nature Stable Isotopes and Their Use in Microbial Biogeochemistry Aquatic Habitats Terrestrial Environments Deep Sea Microbiology Hydrothermal Vents Carbon Cycle