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Using the Quark-Gluon Strings Model (QGSM) combined with Regge phenomenologywe consider the reactions $\pi^- p \to K^0 \Lambda$ and $\pi^- p \to D^-\Lambda_c^+$ which are dominated by the contributions of the $K^*$ and $D^*$Regge trajectories, respectively. The spin structure of the amplitudes isdescribed by introducing Reggeized Born terms. It is found that the existingdata for the reaction $\pi^- p \to K^0 \Lambda$ are in reasonable agreementwith the model predictions. To describe the absolute values of the crosssections it is necessary to introduce also suppression factors which can berelated to absorption corrections. Furthermore, assuming the SU(4) symmetry tohold for Regge residues and the universality of absorption corrections wecalculate the cross section of the reaction $\pi^- p \to D^- \Lambda_c^+$.Employing the latter results from $\pi^- p$ reactions we then estimate thecontributions of the pion exchange mechanism to the cross sections of thereactions $NN \to NK\Lambda$ and $NN \to N\bar D \Lambda_c$ and compare themwith the contributions of the $K$ and $D$ exchanges. We find that the $NN$reactions are dominated not by pion exchange but by $K$ and $D$ exchanges,respectively. Moreover, assuming the SU(4) symmetry to hold approximately forthe coupling constants $g_{ND \Lambda_c}$ = $g_{NK \Lambda}$ we analyze alsothe production of leading $\Lambda_c$ hyperons in the reaction $NN \to\Lambda_c X$. It is shown that the non-perturbative mechanism should give anessential contribution to the $\Lambda_c$ yield for $x \geq 0.5$.Comment: 3 pages, LaTeX, 4 postscript figures; contribution to QNP2002,  Juelich, June 10-14, 200

Exclusive and semi-inclusive strangeness and charm production in $\pi N$ and NN reactions