2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/78600With the help of Mori theory for projective toric manifolds due to M. Reid, we study non projective toric manifolds which become projective after a single blow up along an invariant curve.19 pages, 10 figures. Also available on http://www-fourier.ujf-grenoble.fr/PREP/prep.htmlAlgebraic Geometry14M25, 14E05, 14E30text