depends on $\rg^2$ [@koe95]. Let me already emphasize here, that the theoretical treatment and modelling of SF self-regulation has to allow for the stellar energy of radiation and winds by massive stars already released in SF regions during their lives, i.e. prior to the explosion of supernovae typeII (SNeII). This necessity becomes clear when one continues a high SFR conditioned by gas infall and unaffected for a few million years until the first SNeII emerge. Since lower galaxy masses lead to less dense gas, SF is stretched over time for DGs.

And 3. As SF couples to stellar energy release, and since the counteracting cooling process depends on $\rg^2$, the gas expands due to pressure support and reduces the SFR so that the effect of SF self-regulates non-linearly.

Another important effect that seems to affect the whole network of galaxy formation and evolution is ionizing radiation from the first cosmological objects (supermassive stars, black holes, galaxies). Due to the re-ionization of the gas in the universe, its thermodynamical state is changed so that its accretion onto low-mass objects was reduced [@dij04] and gas already caught in minihalos evaporated again [@bar99]. Since massive objects remained almost unaffected by the re-ionization phase, 