Fig. 5
Results of individual amino acid concentrations during the amino acid excretion and N2-fixation time series experiment. M. marburgensis biomass was washed before inoculation. Amino acid concentration / µmol L−1 of M. marburgensis during N2-fixation on H2/CO2/N2 shown as individual bar charts with standard deviation for each amino acid. The legend on the right-hand side of the graphs indicates the quantified amino acids. On the left-hand y-axis, the amino acid (AA) concentration / µmol L−1 is shown. NH4+ concentrations of the respective time series are indicated on the right-hand y-axis from top to bottom: 0%, 5%, 7.5%, 10%, 100% and 100%_41. 100%_41 denotes amino acid excretion during incubation with H2/CO2 (4:1). The sampling time is shown on the x-axis as headers from left to right. After biomass washing negligible amino acid concentration is measurable at time point 0 h. All results are n = 8.
