QCD, hadrons and nuclei

The nuclear or color transparency in initial and final state interactions of protons, involved in high energy semi-exclusive processes such as (, e'p) and (p, 2 p) reactions, is discussed first in the conventional Glauber approach and then in models taking account of the proton internal dynamics. The conventional approach includes nuclear many-body effects as well as multiple scattering effects and serves as a reference for finding the roles of the internal dynamics in the observed transparency. The models predict non-trivial effects on the transparency. (author)