  We study a homogeneous Tomonaga-Luttinger liquid with backscattering
potential. A perturbative computation of the conductance at and near resonance
is given. We find that the backscattering of one electron dominates that of two
electrons for an interaction parameter $K\geq 1/3$ and that the resonance point
depends on temperature. Our results may be relevant for recent experiments on
shot-noise in FQHE, where the charge 1/3 and not $2*1/3$ is measured on
resonance.
