  We generalize the bosonization methods for systems in the half line that we
discussed elsewhere, to study the effects of interactions on electronic systems
coupled to impurities. We introduce a model for a quantum wire coupled with a
quantum dot by a purely capacitive interaction. We show that the effect on the
quantum wire is a dynamical boundary condition which reflects the charge
fluctuations of the quantum dot. Special attention is given to the role of the
fermion boundary conditions and their interplay with the electron interactions
on the bosonized effective theory.
