k1 = 0.01 
k2 = 1000000000 
k3 = 200000 
k4 = 0.2 
k5 = 1 
k6 = 0 
k7 = 1 
k8 = 1 
k9 = 2.2e-07 
k10 = 5e-08 
k11 = 1.5e-07