  We calculate the nucleon contribution to the photon self-energy in a plasma,
including the effect of the anomalous magnetic moment of the nucleons. General
formulas for the transverse and longitudinal components of the self-energy are
obtained and we give explicit results in various limits of physical interest.
The formulas are relevant for the study of the photon dispersion relations and
the dynamical susceptibility in a nuclear medium such as the core of a
supernova, and has implications with regard to the recent suggestion that the
Cerenkov process $\nu \to \nu\gamma$ can take place in such a system.
