DFT Studies on Zirconium-Mediated Reactions.- Computational Organometallic Chemistry with Force Fields.- New insights onto the molecular mechanism of H2 activation.- Transition Metal-Catalyzed Hydrogenations.- Mechanistic insights into selective oxidation of light alkanes by transition metal compounds/complexes.- Computational Studies on Osmium Catalyzed Olefin Oxidation Reactions.- Reactivity of Metal Carbene Clusters PtnCH2+ and PtMCH2+ (M=Cu, Ag, Au, Pt, Rh) toward O2 and NH3: A Computational Study.- Cobalt Catalyzed Hydroformylation and Cobalt Carbonyl Clusters: Recent Computational Studies.