  Dynamical properties of gauge theories with light flavor quarks are studied
in a dual supergravity by adding a D7-brane probe into the AdS background
deformed by the dilaton. By estimating the vev of flavor quark-bilinear in both
the supersymmetric and non-supersymmetric gravity duals, we find spontaneous
chiral symmetry breaking in the case of the non-supersymmetric background. We
also study quark-antiquark potential for light quarks to see the quark
confinement in the models considered here.
