  A systematic study of $\frac{\partial F_2(x,Q^2)}{\partial \ln Q^2}$ and
$\frac{\partial \ln F_2(x,Q^2)}{\partial \ln (1/x)}$ is carried out in pQCD
taking screening corrections into account. The result of calculations, which
are different from the non screened DGLAP prediction, are compared and shown to
agree with the available experimental data as well as a pseudo data base
generated from the ALLM'97 parameterization. This pseudo data base allows us to
study in detail our predictions over a wider kinematic region than is available
experimentally, and allows us to make suggestions for future experiments. Our
results are compared with the GRV'94 parameterization (which is used as an
input for our calculations) as well as the recently proposed MRST structure
functions.
