Improvement of substrate conversion to molecular hydrogen by three-stage cultivation of a photosynthetic bacterium, Rhodovulum sulfidophilum - Akano, Toru.; Chowdhury, Wasimul Q.; Furutani, Toshio.; Idehara, Kenji.; Ikuta, Yoshiaki.; Maeda, Isamu.; Miura, Yoshiharu.; Mizoguchi, Tadashi.; Mlyasaka, Hltoshi.; Shioji, Norio.; Yagi, Kiyohito.