@inproceedings{RequenaTorresGustenMartinPintadoetal.2011, author = {M. A. Requena Torres and R. Gusten and J. Martin-Pintado and S. Martin and R. Aladro and A. Weiss and B. Klein and S. Heyminck}, title = {The APEX spectral line surveys, more and more excited}, series = {The Molecular Universe, Posters from the Proceedings of the 280th Symposium of the International Astronomical Union held in Toledo, Spain, May 30-June 3, 2011}, pages = {312}, year = {2011}, abstract = {Spectral surveys provide the only way to determine the full molecular inventory of an object and hence build a comprehensive view of the state of the molecular gas and its role in star formation and the structure and evolution of the ISM. Of course spectral surveys also provide the most efficient method of identifying new and unexpected species that have to be include in the chemical networks. The most extensive and complete survey of an extragalactic system has been the continuous spectral survey from 129 GHz to 175 GHz carried out by Mart{\´i}n et al. (2006) toward NGC253. This first spectral line surveys at 2 mm towards the prototypical starbursts galaxies NGC253 have shown an unexpected chemical richness.}, language = {en} }