Supposed that the degradation rate of AHL increases to three times faster than the original one.
Then we simulate the changing tendency of contents of various parameters on our computer. The output
signal would only appears when the input signal switches from 0 to 1. The reason is that with the addition
of IPTG, AHL are produced very quickly which bind to undegraded LuxR protein to initialize the production of
GFP. But with the ceasing of IPTG, AHL are decomposed in a very short time and only a low peak of GFP could
be observed as the left graph displays.
