Historical Perspectives: Research on Purple Bacteria During Twenty-Four Years of International Symposia on Photosynthetic Prokaryotes; G. Drews. Freiburg to Vienna-Looking at Cyanobacteria over the Twenty-Five Years; N.G. Carr. Photosynthesis: Structural and Functional Analyses of Cyanobacterial Photosystem I: The Directionality of Electron Transfer; F. Yang, et al. Electron Transport and Bioenergetics: Photosynthesis and Respiration of Cyanobacteria: Bioenergetic Significance and Molecular Interactions; G.A. Peschek. Genome Analysis and Molecular Biology: From Plastid to Cyanobacterial Genomes; M. Sugiura. Metabolism of N, C, H: Cyanobacterial Nitrogen Assimilation Genes and NtcA-Dependent Control of Gene Expression; E. Flores, et al. Ecology and Symbiosis. Widening Perceptions of the Occurrence and Significance of Cyanobacterial Toxins; G.A. Codd, et al. Phylogeny, Taxonomy, and Evolution: Identification of a Putative Gamma Linker Polypeptide Gene in the Marine Oxyphotobacterium Prochlorococcus Marinus: Implications for the Phylogeny of Prochlorococcus Phycoerythrins; W.R. Hess, F. Partensky. 86 Additional Articles. Index.