Isolation and Identification of a Heterotrophic Nitrifying Bacterium and Its Mutation Breeding by UV-irradiation Effect of Ipomoea aquatica Floating-bed on the quantity and distribution of nitrogen cycling bacteria and nitrogen removal Effects of litter and mineral nitrogen input on soil organic carbon decomposition in subtropical mixed forest in Dinghu Mountain, South China. Oxygen-limited autotrophic nitrification and denitrification—A novel technology for biological nitrogen removal The research progresses on biological oxidation and removal of nitrogen in lakes A research progress in nitrogen conversionAnammox and prosp ects of its application Efficiency and kinetic process of nitrogen removal in a subsurface wastewater infiltration system (SWIS)