def mususpension(temperature, concentration):
    """Returns the dynamic viscosity of the suspension.

    Regression using data from Petkov, G. D. (1996). See Appendix X.


    #Inputs:

        #temperature :Temperature of the medium in the PBR ; °C
        #concentration :Biomass concentration ; g.L-1


    #Outputs:

        #visco : Dynamic viscosity of the suspension ; mPa.s


        """

    # See regression for non excreting strains
    visco = (1.507027 - 0.019466*temperature + 0.035762*concentration)

    return visco