Table 4.

Description of some response curves used to describe antimicrobial activity.

Model	Function	Description
Log-logistic model with three parameters (d, b, e)	$\phi \left(x\right)=\frac{\mathrm{d}}{1+e^{b\left(\log (x\right)-\log \left(e\right))}}$	Individual sensitivity is the same for both low and high doses
Log-logistic model with two parameters (b, e)	$\phi \left(x\right)=\frac{1}{1+e^{b\left(\log (x\right)-\log \left(e\right))}}$
Exponential model with two parameters (d, e)	$\phi \left(x\right)=d(1-e^{\left(-\frac{x}{e}\right)})$	Description of unknown dependency types
Model Michaelis-Menten with two parameters (d, e)	$\phi \left(x\right)=\frac{d}{1+\left(\frac{e}{x}\right)}$	Universal hyperbolic dependence of a decrease in growth rate
Weibull model-1 with three parameters	$\phi \left(x\right)=d(e^{e^{b\left(\log (x\right)-\log \left(e\right))}})$	Sensitivity is not the same for low and high concentrations. The Weibull-1 curve slowly decreases in the region of the upper limit, but faster approaches a lower limit