The quark-meson coupling model, based on a mean field description of non-overlapping nucleon bags bound by the self-consistent exchange of $\sigma$, $\omega$ and $\rho$ mesons, is extended to investigate the properties of finite nuclei. Using the Born-Oppenheimer approximation to describe the interacting quark-meson system, we derive the effective equation of motion for the nucleon, as well as the self-consistent equations for the meson mean fields. The model is first applied to nuclear matter, after which we show some initial results for finite nuclei.Comment: The revised version. This is tar, compressed and uuencoded (including 3 tables and 8 figures). 45 page

Threshold photon electroproduction off the proton allows one to measure new electromagnetic observables which generalize the usual polarizabilities. There are -a priori -ten "generalized polarizabilities", functions of the virtual photon mass. The purpose of this paper is to lay down the appropriate formalism to extract these quantities from the photon electroproduction cross sections.We also give a first estimate of the generalized polarizabilities in the non relativistic quark model.

Deep-inelastic scattering reactions provided the first clear evidence that the quark structure of nucleons and nuclei were significantly different. We review the progress in understanding the nuclear dependence of deep-inelastic scattering reactions and parton distributions-the nuclear EMC effect. While there is now a considerable body of high-quality deep-inelastic data, more work is required to exploit other hard probes with differing sensitivities to quark-flavor and gluon degrees of freedom. A variety of models for the nuclear dependence of structure functions are also considered. Substantial progress has been made in establishing the validity of these models and it is now clear what must be included in any realistic treatment. Nevertheless, it is not yet possible to identify a definitive set of mechanisms that account satisfactorily for the experimental nuclear dependence.

A Ward-Takahashi identity preserving Bethe-Salpeter kernel can always be calculated explicitly from a dressed-quark-gluon vertex whose diagrammatic content is enumerable. We illustrate that fact using a vertex obtained via the complete resummation of dressed-gluon ladders. While this vertex is planar, the vertex-consistent kernel is nonplanar and that is true for any dressed vertex. In an exemplifying model the rainbow-ladder truncation of the gap and Bethe-Salpeter equations yields many results; e.g., pi- and rho-meson masses, that are changed little by including higher-order corrections. Repulsion generated by nonplanar diagrams in the vertex-consistent Bethe-Salpeter kernel for quark-quark scattering is sufficient to guarantee that diquark bound states do not exist.Comment: 16 pages, 12 figures, REVTEX

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