1. Hydrogen Production.Hydrogen production by photosynthetic bacteria: culture media, yield and efficiencies (J.S. Rocha, M.J. Barbosa, R.H. Wijffels). Hydrogen and Poly- (hydroxy) alkanoate production from organic aids by photosynthetic bacteria (N. Noparatnaraporn, K. Takeno, K. Sasaki). Hydrogen from Biomass (T. Wakayama, J. Miyake). Hydrogen photoproduction from starch in algal biomass (A. Ike, H. Kawaguchi, K. Hirata, K. Miyamoto). Photobiological hydrogen production and nitrogenase activity in some heterocystous cyanobacteria (H. Masukawa, K. Nakamura, M. Mochimaru, H. Sakurai). Strategies for improving oxygen tolerance of algal hydrogen production (M. Seibert, T. Flynn, M.L. Ghirardi). 2. Hydrogen World. Emerging hydrogen energy systems and biology (T. Ohta). Biohydrogen: an opportunity for international cooperation (A. San Pietro, J.R. Benemann). Hydrogenotrophy - a new aspect of biohydrogen (Y. Igarashi).3. Biochemical and Metabolic Systems.Maximising photosynthetic efficiencies and hydrogen production in microalga cultures (J. Polle, S. Kanakagiri, J.R. Benemann, A. Melis). A scheme for developing the yield of hydrogen by fermentation (S. Tanisho).4. Molecular Biology. Cyanobacterial hydrogenases and biohydrogen: present status and future potential (P. Lindblad, P. Tamagnini). Integration of hydrogen evolving systems with cellular metabolism: the molecular biology and biochemistry of electron transport factors and associated reductases (P.C. Hallenbeck).5. Genetic Engineering. Screening of marine photosynthetic microorganisms and hydrogen production (T. Matsunaga, H. Takeyama). Metabolic engineering approaches for the improvement of bacterial hydrogen production based on Escherichia coli mixed acid fermentation (K. Sode, S. Yamamoto, M. Tomiyama). Molecular Handling of Hydrogenase (M. Miyake, J. Schnackenberg, C. Nakamura, Y. Asada, J. Miyake).6. Photobioreactors. Production of hydrogen by an Anabaena variabilis mutant in a photobioreactor under aerobic outdoor conditions (A.S. Fedorov, A.A. Tsygankov, K.K. Rao, D.O. Hall). Hydrogen photoproduction by purple bacteria: immobilised vs. suspension cultures (A.A. Tsygankov). Photobioreactor design for photobiological production of hydrogen (J.C. Ogbonna, H. Tanaka). Hydrogen production from food processing wastewater and sewage sludge by anaerobic dark fermentation combined with photo-fermentation (M-S. Kim, T.J. Lee, Y.S. Yoon, I.G. Lee, K.W. Moon).Author Index.