Figure 2From: Optimisation of engineered Escherichia coli biofilms for enzymatic biosynthesis of l-halotryptophans Crystal Violet staining of E. coli engineered biofilms. Biofilms were generated from strains MG1655 and PHL628 (a) or MC4100 and PHL644 (b) with and without pSTB7 using the spin-down method, matured for 7 days in M63 medium and biomass was estimated using crystal violet staining.Back to article page