2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49389We show that when screening corrections are included $\frac{\partial F_{2}(x,Q^{2})}{\partial ln(Q^{2}/Q_{0}^{2})}$ is consistent with the behaviour that one expects in pQCD. Screening corrections explain the enigma of the Caldwell plot. Saturation has not been reached at present HERA energies.6 pages, 4 figures, talk at XXIX Int. Symp. on Multiparticle Dynamics (ISMD99), 9-13 August 1999, Providence R.I., USAHigh Energy Physics - Phenomenologytext