  A simple quasiparticle model, motivated by lowest-order perturbative QCD, is
proposed. It is applied to interpret the lattice QCD equation of state. A
reasonable reproduction of the lattice data is obtained. In contrast to
existing quasiparticle models, the present model is formulated in dynamical
rather than thermodynamical terms, and is easily applicable to a system with
finite baryon density. In particular, the model simulates the confinement
property.
