Effect of changes in meson properties in a nuclear medium - $J/Psi$ dissociation in nuclear matter, and meson-nucleus bound states

We discuss the effect of changes in meson properties in a nuclear medium on physical observables, notably, $J/Psi$ dissociation on pion and $rho$ meson comovers in relativistic heavy ion collisions, and the prediction of the $omega$-, $eta$- and $eta$-nuclear bound states.