Fig. 7
From: Expression regulation of multiple key genes to improve l-threonine in Escherichia coli
Comparison for l-threonine production in E. coli strains TWF001 and TWF083 under different glucose addition. a 30 g/L glucose; b 40 g/L glucose; c 50 g/L glucose; d 2 * 30 g/L glucose, the first was added at the beginning and the second when the glucose was used up completely, respectively; e 2 * 40 g/L glucose, the first was added at the beginning and the second at 18 h, respectively; f 50 and 30 g/L glucose, the first was added at the beginning and the second at 21 h, respectively. The error bars indicate the standard deviations from three independent experiments