  We show that unlike conventional field theory, the particle field theory of
the string's constituents produces in the ladder approximation linear Regge
trajectories, in accord with its string theory dual. In this theory propagators
are Gaussian and this feature facilitates the perturbative evaluation of
scattering amplitudes. We develop general techniques for studying their general
asymptotic form. We consider radiative corrections to the ladder Regge
trajectory and discover that linearity is lost; however, this may be due to
certain approximations we have made.
