Fig. 4From: A food-grade expression system for d-psicose 3-epimerase production in Bacillus subtilis using an alanine racemase-encoding selection markerProduction of RDPE in recombinant strain 1A751D2R by fed-batch fermentation in 7.5 l fermentor. Blue line RDPE activity in medium. Green line biomass. Pink line DO concentration. Orange line pHBack to article page