Fig. 4From: Acetoin production from lignocellulosic biomass hydrolysates with a modular metabolic engineering system in Bacillus subtilisA and B Effects of various promoters on the activities of ALS (encoded by alsS) and ALDC (encoded by alsD), respectively. C Effects of different promoters on the growth of B. subtilis after overexpression of the alsS and alsD genes. D Effects of various promoters on acetoin production by B. subtilis after overexpression of the alsS and alsD genes. All assays were performed in triplicate, and the standard deviations of biological replicates are indicated by error barsBack to article page