2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83054In this talk I first discuss predictions based on QCD sum rules and on hadronic models for the properties of vector mesons in the nuclear medium. I then describe possible experimental signatures and show detailed predictions for dilepton invariant mass spectra with a special emphasis on nuclear reactions involving elementary incoming beams and nuclear targets. I will in particular illustrate that the sensitivity of pion and photon induced reactions to in-medium effects is comparable to that of heavy-ion reactions.14 pages, incl. 5 figures. Invited paper at BARYONS'98, Bonn, Sept. 22- 26 minor text changesNuclear TheoryHigh Energy Physics - Phenomenologytext