From 2007.igem.org

<math>\frac{1}{2}</math> \\ y=\frac{\alpha \times Y}{N_{LacY}}\\ x=\frac{X}{X_{0}}\\ \rho=\frac{R_{T}}{R_{0}+1}\\ \beta=\frac{N_{LacY} \times \tau_{x} \times B}{\alpha \times X_{0}}\\ \lambda=frac{\tau_{x} \times \Lambda}{X_{0}}