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(A) P. islandicum growth in 60-ml serum bottles on H2, 0.05% acetate, and 0.001% yeast extract (•), on H2 and 0.001% yeast extract (○), on Ar, 0.05% acetate, and 0.001% yeast extract (▴), and on Ar and 0.001% yeast extract (▵). (B) Growth in the 20-liter fermentor on H2 and CO2 (▴), on H2, 0.05% acetate, and 0.001% yeast extract (○), and on 0.05% casein hydrolysate and 0.02% yeast extract (•).
