Fig. 4

Growth of G. oxydans ∆GOX1068∆GOX0854 in mineral salts medium containing different concentrations of glycerol. a Cell density, (black square) 1 g L⁻¹, (red circle) 2 g L⁻¹, (blue triangle) 5 g L⁻¹, (green inverted triangle) 10 g L⁻¹, (pink left-pointing triangle) 20 g L⁻¹. Consumption of glycerol could be found in Additional file 3: Figure S2. b The dry cell weight (red) and biomass yield (black) of G. oxydans ∆GOX1068∆GOX0854 in mineral salts medium containing different concentrations of glycerol. The yield of G. oxydans ∆GOX1068∆GOX0854 was calculated based on concentrations of the cells and added glycerol. Calculation of dry cell weight: g DCW L⁻¹ = 0.3896 × ∆OD_{600 nm}− 0.0004. The error bars represent the standard deviations of three independent experiments