Fig. 1
Autotrophic and mixotrophic growth experiments with C. drakei employing H2 + CO2 as headspace atmosphere with different lactate supplementation. (A), optical density (white) and formate concentration (grey); (B), substrate consumption with lactate concentration (white) and accumulated pressure loss of the headspace (grey); (C), short-chain products acetate (white) and ethanol (grey); (D), butyrate (white) and hexanoate (grey). (squares □): Autotrophic C. drakei cultures with 110 kPa H2 + CO2 in the headspace and no lactate supplementation. (circles ○): Mixotrophic C. drakei cultures with 110 kPa H2 + CO2 in the headspace and supplementation of 20 mM lactate. (triangles ∆): Mixotrophic C. drakei cultures with 110 kPa H2 + CO2 in the headspace and supplementation of 40 mM lactate. Plotted data points are the arithmetic mean of three biological replicates. Error bars represent the respective standard deviation