Main research interests:
1.The evolution of the gaseous content of the Universe: distribution of the neutral and ionized gas in large scale cosmic structures, such as Lyman-alpha absorbing clouds and dwarf galaxies at various cosmological times. Estimates of the cosmological baryonic content.
2.Dark matter in cosmological structures: test of cosmological models through the determination of the possible dark matter density in the center and in the outermost regions of late type galaxies.
3.The ISM and IGM in our Local Group: the effects of the cosmic web and background radiations on our Local faintest and bright galaxies. Observations and theoretical modelling of ISM structures and thermal phases in M31 and M33 and of the processes which regulates the star formation.