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Dynamical quasiparticle properties are determined from lattice  QCD along the line of the Peshier model for the running strong couplingconstant in case of three light flavors. By separating time-like and space-likequantities in the number density and energy density the effective degrees offreedom in the gluon and quark sector may be specified from the time-likedensities. The space-like parts of the energy densities are identified withinteraction energy (or potential energy) densities. By using the time-likeparton densities (or scalar densities) as independent degrees of freedomvariations of the potential energy densities with respect to the time-likegluon and/or fermion densities lead to effective mean-fields for time-likegluons and quarks as well as to effective gluon-gluon, quark-gluon andquark-quark (quark-antiquark) interactions. The latter dynamical quantities arefound to be approximately independent on the quark chemical potential and thuswell suited for an inplementation in off-shell parton transport approaches.Results from the dynamical quasiparticle model (DQPM) in case of two dynamicallight quark flavors are compared to lattice QCD calculations for the net quarkdensity as well as for the 'back-to-back' differential dilepton production rateby $q-{\bar q}$ annihilation. The DQPM is found to pass the independent tests.

Dynamical quasiparticles properties and effective interactions in the sQGP