1. THE PRELIMINARY ADSORPTION INVESTIGATION OF URTICA DIOICA L. BIOMASS MATERIAL AS A POTENTIAL BIOSORBENT FOR HEAVY METAL IONS . Authors: NENAD S. KRSTIĆ, ALEKSANDAR L.J. BOJIĆ, MILICA G. NIKOLIĆ, IVAN M. KRSTIĆ1F, DRAGAN M. ĐORĐEVIĆ, MAJA N. STANKOVIĆ, VLADIMIR D. DIMITRIJEVIĆ.2. ZERO-VALENT IRON NICKEL MODIFIED NATURAL ZEOLITE MATERIAL: CHARACTERIZATION AND ENVIRONMENTAL ASPECT OF APPLICATION – FIRST RESULTS. Authors: NENAD S. KRSTIĆ, VLADIMIR D. DIMITRIJEVIĆ, MAJA N. STANKOVIĆ, DEJAN T. DULANOVIĆ, MILOŠ G. ĐORĐEVIĆ, MILOŠ MARINKOVIĆ, DRAGAN M. ĐORĐEVIĆ.