Fig. 2

Production of n-butanol in strains with the amplification of the pyruvate oxidation pathway. The engineered E. coli strains were grown in M9Y medium containing 20 g/L glucose. The fermentations were conducted under the oxygen-limited condition for 24 h. The experiments were conducted in triplicate. Keys: a the fermentation performance for strain BuT-8-Fdh1; b the fermentation performance for strain BuT-9