  Fano lineshapes in resonant transmission in a quantum dot imply interference
between localized and extended states. The influence of the charge accumulated
at the localized levels, which screens the external gate voltage acting on the
conduction channel is investigated. The modified Fano q parameter and the
resonant conduction is derived starting from a microscopic Hamiltonian. The
latest experiments on "charge sensing" and ``Coulomb modified Fano sensing ``
compare well with the results of the present model.
