2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83263We present predictions for the spin structure functions of the proton and the neutron in the framework of a unitary isobar model for one-pion photo- and electroproduction. Our results are compared with recent experimental data from SLAC. The first moments of the calculated structure functions fulfill the Gerasimov-Drell-Hearn and Burkhardt-Cottingham sum rules within an error of typically 5-10% for the proton. For the neutron target we find much bigger deviations, in particular the sum rule for I_1(0)+I_2(0) is heavily violated.10 pages LATEX including 5 postscript figures, Proc. of the Second Int. Conf. on Perspectives in Hadronic Physics, Trieste 1999Nuclear Theorytext