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diff --git a/1202/CH22/EX22.1/22_1.png b/1202/CH22/EX22.1/22_1.png
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diff --git a/1202/CH22/EX22.1/22_1.sce b/1202/CH22/EX22.1/22_1.sce
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+clear
+clc
+
+//Example 22.1
+disp('Example 22.1')
+
+//Parameters
+Yxs=0.4;B=0.2;Pm=50;Ki=22;
+a=2.2;mu_m=0.48;Km=1.2;Sf=20;
+
+
+//ODE model
+function ydot=model(t,y,D)
+    X=y(1);S=y(2);P=y(3);
+    
+    Xdot=-D*X+mu(S,P)*X;
+    Sdot=D*(Sf-S)-1/Yxs*mu(S,P)*X;
+    Pdot=-D*P+[a*mu(S,P)+B]*X
+    
+    ydot=[Xdot Sdot Pdot]';
+endfunction
+
+//Rate law
+function mu=mu(S,P)
+    mu=mu_m*(1-P/Pm)*S/(Km+S+S^2/Ki);    
+endfunction
+
+t=0:0.1:100;t0=0;
+y0=[6 5 19.14]';//Initial stable condition
+
+D=0.202*1.1;//10% increase
+y_up = ode(y0, t0, t, list(model,D))
+D=0.202*0.9;//10% decrease
+y_down = ode(y0, t0, t, list(model,D))
+
+subplot(2,1,1);
+plot(t,y_up(1,:),color='red');
+plot(t,y_down(1,:));
+xtitle("$D=0.202\ h^{-1}$","Time(h)","Biomass (g/L)")
+legend("Dilution +10%","Dilution -10%")
+
+subplot(2,1,2);
+t=0:0.1:100;t0=0;
+y0=[6 5 44.05]';//Initial stable condition
+D=0.0389*1.1;//10% increase
+y_up = ode(y0, t0, t, list(model,D))
+D=0.0389*0.9;//10% decrease
+y_down = ode(y0, t0, t, list(model,D))
+
+plot(t,y_up(1,:),color='red');
+plot(t,y_down(1,:))
+xtitle("$D=0.0389\ h^{-1}$","Time(h)","Biomass (g/L)");
+legend("Dilution +10%","Dilution -10%")