Rhodopseudomonas sphaeoides B6 세포를 agar gel 중에 고정했을 때, 수소생산을 위한 최적 agar 농도는 2(w/v)였다. B6의 2% agar gel 고정화균체(300ml gel: 2.85 mg dry cells/ml)와 비고정세포(1l culture: 0.87 mg dry cells/ml)에 있어서 초기의 최고 수소 생산활성은 각각 47.5 및 48.0ml/hr/culture로 거의 같았다. 그러나, 수소생산이 거의 정지된 배양후기에는 lactate의 제한공급( 10 mmole)에 의한 비고정세포의 활성회복은 50% 이하로 감소되었지만, 고정화세포의 활성은 거의 초기상태로 회복되었다.
The Photosynthetic bacterium, Rhodopseudomonas sphaeroides strain B6 was irnmobilized on agar gel. The optimum concentration of agar for hydrogen production was 2% (w/v). Maximum rates of hydrogen production by immobilized (300 ml of gel; 2.85 rng dry cells/ml) and free cells (1l culture; 0.87 mg dry cells/ml) were 47.5 and 48.0 ml/hr/culture, respectively. However, when both cultures were fed by 10 mmoles of lactate as limited electron donor at the later period of incubation, the activity of hydrogen production by free cells was significantly decreased but, immobilized cells continued hydrogen production with almost the same initial rate. Wc examined hydrogen production by immobilized cells of strain B6 under periodic illumination for 12 hr-intervals. When the culture was periodically fed by basal medium containing 9.3 rnmoles of DL-lactate and 1.86 mmoles of L-glutamate as consumed electron donor and nitrogen source, respectively, for every one liter of hydrogen produced, hydrogen was evolved continuously with the average rate of 510 ml/day/300 ml gel (2.9 rng dry cellslml) during the incubation time for 228 hr
