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Time course of hydrogen consumption by Methanimicrococcus blatticola, Methanomassiliicoccus luminyensis, Methanosphaera stadtmanae and Methanobrevibacter strain AMG1 (three replicate cultures). The baseline represents the detection limit of our assay system (0.1 Pa). The arrow in the graph of M. blatticola exemplifies the addition of fresh hydrogen to the culture (not shown for all species).
