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(A) Molar ratio of Fe(II) to total Fe concentration [Fe(II)/Fe(tot)] in dilute HCl extracts of solid-phase material in quartz diorite enrichment cultures containing 3 separate inocula from the rindlet–saprolite interface (A, B, and C) compared to abiotic uninoculated controls. (B and C) ATP content of cultures containing quartz diorite (B) or quartz sand (C). Data points and error bars denote the mean and range of duplicate cultures.
