galaxy evolution, both on the observational and on the theoretical side.

On the one hand, blueshifted absorption lines in the UV and X-ray spectra of active galaxies reveal the presence of massive outflows of ionized gas from their nuclei; they are characterized by high-velocities (up to 0.4 c) indicating mass flows of 1-10 $M_{\odot}$/yr (see Crensahw, Kramer, George 2003; Chartas 2002, 2004; Pounds et al. 2003). Further evidences based on the radio and X-ray observations of galaxies (Böringer et al. 1993, Fabian et al. 2000; McNamara et al. 2000) indicate that bubbles of radio-emitting plasma are present in elliptical galaxies containing supermassive black &lt;holes (SMBHs). On larger scales, fast (1000 km/s) massive (10-50 $M_{\odot}/yr$) flows of neutral gas are observed through 21-cm absorption of radio-loud AGNs (see Morganti, Tadhunter & Oosterloo 2005), indicating that AGNs have a major effect on the circumnuclear gas in the central kiloparsec region of AGNs. Since the powers of outflows are similar to (or even excede) the observed bolometric luminosities and the cooling losses, these observations indicate that the feedback from AGN has to be considered among the processes which regulate the evolution of baryons in the galactic potential wells, and, of course, the growth 