2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10842We further discuss the suggestion that the chemistry in a photon-dominated region is coupled to that in the UV-shielded region behind it by turbulent t ransport processes. In addition to transport time-scales, we discuss why MHD waves/turbulence will likely cause transport instead of prohibiting it.4 pages, in "CO: Twenty Five Years of Millimeter Wave Spectroscopy", Proceedings of the 170th IAU Symposium, Tucson, Arizona, 1995 May 29-June 5, Eds. W.B.Latter et al, (Kluwer: Dordrecht)Astrophysicstext