Abstract
Observations of molecular and dust emission in high redshift galaxies is one of the challenges for GTM. Current studies on the observability of the molecular lines and dust emission are based on observed templates of local ultraluminous infrared galaxies (ULIRGs, e.g. Bain et al.1996). However the environmental conditions in galaxies at higher redshifts could be different from those found among local galaxies and what is needed is a thorough investigation of the global relationships between gas, dust and star formation process. For this purpose we present a study of the properties of dust and molecular gas in 6 LIRGs and outline a new method that combines the dust emission models provided by GRASIL with one-zone molecular emission models.