  Effective chiral Lagrangians involving constituent quarks, Goldstone bosons
and long-distance gluons are believed to describe the strong interactions in an
intermediate energy region between the confinement scale and the chiral
symmetry breaking scale. Baryons and mesons in such a description are bound
states of constituent quarks. We discuss the combined use of the techniques of
effective chiral field theory and of the field theoretic method known as
Fock-Tani representation to derive effective hadron interactions. The Fock-Tani
method is based on a change of representation by means of a unitary
transformation such that the composite hadrons are redescribed by
elementary-particle field operators. Application of the unitary transformation
on the microscopic quark-quark interaction derived from a chiral effective
Lagrangian leads to chiral effective interactions describing all possible
processes involving hadrons and their constituents. The formalism is
illustrated by deriving the one-pion-exchange potential between two nucleons
using the quark-gluon effective chiral Lagrangian of Manohar and Georgi. We
also present the results of a study of the saturation properties of nuclear
matter using this formalism.
