Introduction (R.R. Colwell). Scope of Microbial Diversity: Importance of the Diversity of Community Relations (H. Kawanabe). Evolution of Microbial Diversity: From Strains to Domains: Measuring the Degree of Phylogenetic Diversity among Prokaryotic Species and as yet Uncultured Strains (E. Stackebrandt). Diversity of Viruses (M. Hatanaka). The Evolution of Fungal Diversity: Past, Present, and Future (A.Y. Rossman). Mutual Interaction and Microbial Diversity: Symbiosis in Termites (I. Yamaoka). The Role of Microorganisms in Tritophic Interaction Systems Consisting of Plants, Herbivores, and Carnivores (M. Dicke). Sensitivity Analysis in Microbial Communities (H. Nakajima, Z. Kawabata). Microbial Diversity in Environments: Adaptation of Soybean Bradyrhizobia to the Brazilian Edaphic Savanna (M.C.P. Neves et al.). Viruses and DNA in Marine Environments (J.H. Paul). Diversity of Naturallyoccurring Prokaryotes: A Beginning (E.F. DeLong). Workshop 'Microbial Diversity and Cycling of Bioelements': Image Analysis of Bacterial Cell Size Diversity (K. Kato). Microbial Diversity and Cycling of Nitrogen in Soil Ecosystem (T. Ueda, K. Inubushi). 6 additional articles. Index.