We investigate the processes leading to phase-space equilibration of parton
distributions in nuclear interactions at collider energies. We derive a set of
rate equations describing the chemical equilibration of gluons and quarks
including medium effects on the relevant QCD transport coefficients, and
discuss their consequences for parton equilibration in heavy ion collisions.Comment: 18 pages, 6 Figures appended as uuencoded PostScript files, (no
changes in the previously submitted manuscript), DUKE-TH-93-4
