Astrochemistry: From primordial gas to present-day clouds
  Astrochemistry plays a central role during the process of star formation,
both in the primordial regime as well as in the present-day Universe. We
revisit here the chemistry in both regimes, focusing first on the chemistry
under close to primordial conditions, as observed in the so-called Caffau star
SDSS J102915+172927, and subsequently discuss deuteration processes in
present-day star-forming cores. In models of the high-redshift Universe, the
chemistry is particularly relevant to determine the cooling, while it also
serves as an important diagnostic in the case of present-day star formation.
