  In this paper, we investigate deep inelastic and elastic scattering on a
polarized spin-1/2 hadron using gauge/string duality. This spin-1/2 hadron
corresponds to a supergravity mode of the dilatino. The polarized deep
inelastic structure functions are computed in supergravity approximation at
large t' Hooft coupling $\lambda$ and finite $x$ with $\lambda^{-1/2}\ll x<1$.
Furthermore, we discuss the moments of all structure functions, and propose an
interesting sum rule $\int_{0}^{1} \textrm{d}x g_2(x, q^2) =0$ for $g_2$
structure function which is known as the Burkhardt-Cottingham sum rule in QCD.
In the end, the elastic scattering is studied and elastic form factors of the
spin-1/2 hadron are calculated within the same framework.
