Abstract
In the framework of nonperturbative QCD phenomenology we discuss: (1) The elementary process for the creation of color-singlet q q -pairs inside a hadron. (2) The interaction of the q q -pair with the surrounding quark-gluon medium. An important consequence of these discussions is that meson emission takes place preferentially, if the primary q q -pair is created in the surface region of the hadron. For the case of pseudoscalar coupling we employ PCAC to obtain the coupling of the q q -pair to the pion. The resulting form and coupling strength of the πNN vertex is consistent with the phenomenological OPEP.
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