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Using the leading-twist approximation of the Wilson operator productexpansion with "frozen" and analytic versions of the strong-coupling constant,we show that the Bessel-inspired behavior of the structure function F_2 and itsslope\break partial ln(F_2)/partial ln(1/x) at small values of x, obtained fora flat initial condition in the DGLAP evolution equations, leads to goodagreement with experimental data of deep-inelastic scattering at DESY HERA.

Small-x behavior of the structure function F_2 and its slope partial ln(F_2)/partial ln(1/x) for "frozen" and analytic strong-coupling constants