  We extend previous analyses of the violation of Lorentz invariance induced in
a non-critical string model of quantum space-time foam, discussing the
propagation of low-energy particles through a distribution of non-relativistic
D-particles.We argue that nuclear and atomic physics experiments do not
constitute sensitive probes of this approach to quantum gravity due to a
difference in the dispersion relations for massive probes as compared to those
for massless ones, predicted by the model.
