  We study thermal corrections to the dispersion relations of massive
fundamental particles immersed in weakly coupled non-Abelian plasmas. The cases
covered include quarks in the QCD (quark-gluon) plasma, as well as N=2 quarks
and scalars in an N=4 Super Yang-Mills plasma. We perform the calculations to
leading order in a weak coupling expansion, and consider all mass scales of the
fundamental fields, ranging from massless particles all the way to bare masses
parametrically larger than the temperature.
