Fig 6. Influence of the maintenance coefficient on the predicted flux and yield ranges (light blue area) for the ethanol uptake rate (rEth), CO2 excretion rate (rCO2), methane excretion rate (rCH4), methane to CO2 ratio (YCH4/CO2) and methane yield (YCH4/Eth).
The blue axes refer to methane yield and methane to CO2 ratio whereas the black axes refer to the exchange rates. The maintenance coefficient was set to the original specific values (A) or to equal values of 1 (B), 2 (C) and 3 mmolATP/gDW/h (D) for all organisms. The red circles show data from enrichment culture experiments (averaged values of two reactors for a dilution rate of 0.001 h-1, see Table 3). The community growth rate was fixed to 0.001 h-1 with ethanol as the only substrate.