Figure 3.

Comparisons of ethanol production between three kinds of Z. mobilis strains in medium with different concentration of yeast extract. Strains were grown in medium (1 g/L KH₂PO₄, 1 g/L Carbamide, 0.5 g/L MgSO₄.6H₂O) with 230 g/L glucose as carbon source, supplemented with different amounts of yeast extract (as indicated) under anaerobic conditions at 32°C. All strains were tested by three parallel experiments. After 60 hours fermentation, ethanol production of all strains was measured immediately by GC.