We present the main research activities of the IAC research Group ``Stellar Populations in Galaxies'', with emphasis on the topics that are directly related to planned research using the GTC.

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Several recent experiments have shown evidence for the existence of a new microwave emission process in our Galaxy (in the range 10-60 GHz) that may affect the ability to infer cosmological parameters from the Cosmic Microwave Background with the aimed precision of 1%.

This document describes the scientific case for a wide-field 6.5-m spectroscopic telescope. The key scientific aims are linked to two different modes of operation: 1) Study the detailed astrophysics of extended systems via high-quality, medium-resolution spectroscopy using multiple Integral Field Units (IFU) and 2) Study the structure of the

The Observatorio Astronómico Nacional at San Pedro Mártir is located 31°02'40'' N and 115°28'00'' W on the summit of the Sierra San Pedro Mártir in the Baja California peninsula, Mexico, at 2800 m above sea level. The results of nearly three decades of site characterization work are summarized. These cover the following aspects: weather, cloud