Magnetic Effects in Global Star Formation
  I review the effects of magnetic fields on star formation in galaxies. This includes the effects of the magnetorotational instability (MRI) at galactic scales, magneto-Jeans and swing instabilities, Parker instabilities, and the effects of magnetic fields on the evolution of supernova-driven turbulence. I argue that currently turbulent support by the MRI appears likely to be the most important of these processes to regulating star formation. 
Mordecai-Mark Mac Low (Dept. of Astrophysics, American Museum of   Natural History, New York, NY)