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Using the self-consistent Hartree-Fock  approximation for electrons with spin at zero  temperature, we study the effect of the electronic  interactions on the charge distribution in a one- dimensional continuous ring containing a single  {\it delta} scatterer. We reestablish that the  interaction suppresses the decay of the Friedel  oscillations. Based on this result, we show that  in an infinite one-dimensional conductor  containing a weak scatterer, the current is  totally suppressed because of a gap opened at the  Fermi energy. In a canonical ensemble of  continuous rings containing many scatterers, the  interactions enhance the average and the typical  persistent current

Spin and interaction effects on charge distribution and currents in one-dimensional conductors and rings within the Hartree-Fock approximation