2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/395801. Data and implications. 2. Neutrino threshold effects. 3. Renormalisation of the neutrino mass operator and stability properties of neutrino textures. 4. Neutrino thresholds effects and Yukawa unification. 5. Renormalisation-induced lepton-flavour-violating processes from non-zero neutrino masses. 6. Summary.19 pages, 6 figures. Invited talk at the Cracow Epiphany Conference on Neutrinos in Physics and Astrophysics, January 2000. Proceedings to appear in Acta Physica Polonica BHigh Energy Physics - Phenomenologytext