  We study nucleon structure functions within the bosonized Nambu-Jona-Lasinio
(NJL) model where the nucleon emerges as a chiral soliton. We discuss the model
predictions on the Gottfried sum rule for electron-nucleon scattering. A
comparison with a low-scale parametrization shows that the model reproduces the
gross features of the empirical structure functions. We also compute the
leading twist contributions of the polarized structure functions $g_{1}(x)$ and
$g_{2}(x)$ in this model. We compare the model predictions on these structure
functions with data from the E143 experiment by GLAP evolving them from the
scale characteristic for the NJL-model to the scale of the data.

High Energy Physics - Phenomenology