Fig. 1.

¹³C-DIC production in time, during 4-day batch incubations, in the absence (control) or in the presence of one candidate-IEC. The bottles contained 30 mL biomass suspension from the enrichment bioreactor and initially 0.16 (±0.01) MPa ¹³CH₄, 15 (±1) mM sulfate and 0.2 (±0.1) mM sulfide