  N=4 supersymmetric Yang-Mills operators carrying large charges are dual to
semiclassical strings in AdS_5xS^5. The spectrum of anomalous dimensions of
very large operators has been calculated solving the Bethe ansatz equations in
the thermodynamic limit, and matched to energies of string solitons. We have
considered finite size corrections to the Bethe equations, that should
correspond to quantum effects on the string side.
