“…Three media were prepared by subsequent addition to basal medium of the following electron sources: lactate (40 mM), acetate (20 mM), and H 2 /CO 2 (80/20, v/v), 2 bars or methanol (40 mM), acetate (20 mM), and H 2 /CO 2 (80/20, v/v), 2 bars as carbon and energy sources to enrich and isolate SRB and methanogens, respectively, but also fermentative bacteria possibly growing on yeast extract as energy source [27,30].…”