  The onset of gaseous inflows and central activity in interacting galaxies is
driven largely by induced bars in the host galaxies. The stability of galaxies
against growing bar modes is a direct function of their structural properties
--- galaxies with central bulges or low disk surface densities are more stable
against central starbursts than are bulgeless or disk-dominated systems. Low
surface brightness galaxies prove less prone to bar formation and central
starbursts than do normal high surface brightness galaxies. This stability of
LSB disks also resolves many of the dynamical pitfalls encountered when
attempting to link poststarburst "E+A" galaxies to interactions involving
normal high surface brightness galaxy progenitors.
