2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148687We present a theoretical analysis of recent experimental results of Yacoby et al. on transport properties of high quality quantum wires. We suggest an explanation of observed deviations of the conductance from the universal value $2e^2/h$ per channel in the wire. We argue that at low temperatures and biases the deviation can be a consequence of anomalously enhanced backscattering of electrons entering the 2DEG from the wire and is not connected to intrinsic properties of 1DEG.4 pages, LaTeX, a model of interaction between 1DEG and 2DEG is improved to fit the experimental setup of Yacoby et al., the numerical estimate for conductance reduction is found to be in agreement with experimental dataMesoscale and Nanoscale Physicstext