Abstract

The photosynthetic bacteria Rhodopseudomonas capsulata strain B10 were immobilized in agar or in carrageenan beads (O = 1–3 mm). Beads containing 5.8 mg cell dry weight/mL of gel produced hydrogen from lactate at a rate of 54 mL/h.g dry weight; the efficiency of H2 production by immobilized cells was comparable to that of free cells and was 60 to 65% that of the theoretical maximum from lactate. Carrageenan-entrapped cells produced H2 steadily over a 16-day period.

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