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function M=Monod(c,Y)
M= -c(1).*Y./(Y+c(2))


Y=[255.55 246.44 237.28 228.36 136.08 114 99.16 82.33 69.4 56.94 42.31 0];
x=[-0.78 -2.2268 -5.2033 -6.1377 -8.6137 -8.6428 -8.4792 -8.1692 -7.7128 -7.11 -6.3608 -1.9];
x=x/214.63;
c0=[0.03 0.3];beta=nlinfit(Y,x ,¡¯Monod¡¯,c0);
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beta =

    0.0271
   -8.1892
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beta =

    0.0249  -14.4864
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