  I discuss in this paper the continuum limit of integrable spin chains based
on the superalgebras sl(N/K). The general conclusion is that, with the full
``supersymmetry'', none of these models is relativistic. When the supersymmetry
is broken by the generator of the sub u(1), Gross Neveu models of various types
are obtained. For instance, in the case of sl(N/K) with a typical fermionic
representation on every site, the continuum limit is the GN model with N colors
and K flavors. In the case of sl(N/1) and atypical representations of spin j, a
close cousin of the GN model with N colors, j flavors and flavor anisotropy is
obtained. The Dynkin parameter associated with the fermionic root, while
providing solutions to the Yang Baxter equation with a continuous parameter,
thus does not give rise to any new physics in the field theory limit.
  These features are generalized to the case where an impurity is embedded in
the system.
