[en] Within a unified microscopic model of heavy ion reactions transport coefficients for four different phenomena have been calculated. A gradient in chemical potential, Δμ, drives the particle flux. The temperature mismatch, ΔT, drives the entropy flux. The velocity mismatch, Δu vector, sets in motion the momentum flux. In addition there is a coupling between particle and entropy flux in such a way that the hotter gas is giving away particle to the colder one. This effect, as has been pointed out by Moretto, counteracts the driving force towards symmetry in mass number. In how far it can be made responsible for the lack of mass drift seen in heavy ion collisions will be discussed later. Analytical expressions for all derivatives of Ω for the case of a classical single particle penetrability P (P=1 above, P=O below the barrier) have been worked out. Comparisons with experimental data are given