Fig. 1
From: Adsorption of Hg2+/Cr6+ by metal-binding proteins heterologously expressed in Escherichia coli
Construction and pre-selection of adsorption strains. a The profile of the artificial plasmids. b-d The influence of different elements and optimization methods on the ability of engineered strains to adsorb heavy metals. All data shown are the mean ± SEM of three independent experiments