Fig. 3From: Efficient production of extracellular pullulanase in Bacillus subtilis ATCC6051 using the host strain construction and promoter optimization expression systemExtracellular PUL expression driven by the dual-promoter systems in ATCC6051∆10. a Time profiles of extracellular PUL activity for the sixteen dual-promoters in ATCC6051∆10. b Time profiles of the dry cell weight for the sixteen dual-promoters in ATCC6051∆10. c SDS-PAGE analysis of extracellular PUL expression by these dual-promoter plasmid-containing strains. The protein bands of PUL were indicated by arrowsBack to article page