We discuss the dynamics of stretched DNR chains, subjected to a tension for
ce f, in a "taut" regime where phi = fl(p0)/k(B)T > 1 (l(p0) being the unpe
rturbed persistence length). We deal with two variables: the local transver
se displacements u, and the longitudinal position of a monomer u(parallel t
o). The variables u and u(parallel to) follow two distinct Rouse equations,
with diffusion coefficients D-perpendicular to = f/eta (where eta is the s
olvent viscosity) and D-parallel to = 4 phi(1/2)D(perpendicular to).
We apply these ideas to a discussion of various transient regimes.