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From 2013.igem.org
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In this equation, PoPStrxC,PoPSLuxcI represents the promoter strength of promoter trxC and LuxcI hybrid promoter, which is measured by the rate of RNApolymerase binding to the starting site of DNA transcription; \frac{1-[ROSoxyR]^n ROSoxyR }{ Kd ROSoxyR ^n ROSoxyR + [ROSoxyR]^n ROSoxyR I} represents the hill effect of activator ROSoxyR complex to trxCpromoter; \frac{1-[ LuxRAHL]^nLuxRAHL}{ KdLuxRAHL ^nLuxRAHL + [LuxRAHL]^nLuxRAHL} represents the hill effect of activator LuxRAHL to LuxcI hybrid promoter; \frac{1-[CI leak]^nCI}{ KdCI^nCI+[CI]^nCI} represents the hill effect of repressor CI, while frac{1-{1-[CI leak]^nCI}}{ KdCI^nCI+[CI]^nCI} takes CI leaking into consideration (promoter pLac will not close thoroughly even though CI exists).
For the section of the equation, \frac{1-[ROSoxyR]^n ROSoxyR }{ Kd ROSoxyR ^n ROSoxyR + [ROSoxyR]^n ROSoxyR I} \times PoPStrxC\times\frac{N}{V} represents the synthesizing rate of mRNALuxI under the influence of activator ROSoxyR complex and trxC promoter; \frac{1-[ LuxRAHL]^nLuxRAHL}{ KdLuxRAHL ^nLuxRAHL + [LuxRAHL]^nLuxRAHL}\times\frac{1-{1-[CI leak]^nCI}}{ KdCI^nCI+[CI]^nCI}\times PoPSLuxCI\times\frac{N}{V} represents the synthesizing rate of mRNALuxI under the influence of LuxRAHL complex, CI repression and leaking, and LuxcI hybrid promoter; -kdegmRNA\times [mRNAluxI]represents the degrading rate of mRNAluxI.