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Fig. 4 | Journal of Biological Engineering

Fig. 4

From: Using the promoters of MerR family proteins as “rheostats” to engineer whole-cell heavy metal biosensors with adjustable sensitivity

Fig. 4

The competition hypothesis used for explaining the Parabola Principle. a-c The situations of low, optimum, and high ratios of SPs to SPBPs. d The situation involving the decreasing ratio of SPs to SPBPs by the introduction of additional copy numbers of SPBP-eGFP units. e-f The eGFP RFI per OD of a series of pMetalMultiGFP biosensors when incubated with 20, and 40 μmol/L of Cd (II), respectively

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