TY - SER AU - Gabrielyan, lilit AU - Trchounian, Armen AU - Hakobyan, lilit TI - Ni (II) and Mg (II) Ions as Factors Enhancing Biohydrogen Production by Rhodobacter Sphaeroides from Mineral Springs KW - Ph KW - Hydrogen Photoproduction KW - Rhodobacter Sphaeroides ER -