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A novel heterotrophic nitrifying and aerobic denitrifying bacterium, KTB, was isolated from activated sludge flocci collected from a biological aerated filter according to the modified Takaya method and identified as Pseudomonas stutzeri by 16S rDNA gene sequence analysis. When shaking-cultured in the presence of 4.331 mmol/L of nitrate, 4.511 mmol/L of nitrite and 4.438 mmol/L of ammonium, the strain...