  We investigate the characteristic properties of self-sustained MRI turbulence
in low-ionized proto-planetary disks. We study the transition regime between
active and dead-zone, performing 3D global non-ideal MHD simulations of
stratified disk covering range of magnetic Reynolds number between 2700 < Rm <
6600. We found converged and saturated MRI turbulence for Rm > 5000 with a
strength of alpha ~ 0.01. Below Rm < 5000 the MRI starts to decay at the
midplane, having Elsasser numbers below one. We find a transition regime
between 3300 < Rm < 5000 where the MRI turbulence is still sustained but
damped. At around Rm < 3000 the MRI turbulence decays but could reestablished
due to the accumulation of toroidal magnetic field or the radial transport of
magnetic field from the active region. Below Rm < 3000 the MRI cannot be
sustained and is decaying. Here hydro-dynamical motions, like density waves
dominate. We observe anti-cyclonic vortices in the transition between dead-zone
and active zone.
