  We study the dynamics of the quark-hadron transition for a scenario in which
the Universe is matter dominated and a large amount of entropy is generated by
decaying particles of mass 1--10 TeV, as suggested by a large class of
superstring--inspired models. We estimate the nucleation rate and compute the
mean separation between baryon fluctuations generated during the transition
following their evolution up to the onset of primordial nucleosyntheisis.
