Abstract
Ammonia (referring to both NH3 and NH4 +), is one of the most toxic nitrogen forms, and is toxic to many aquatic organisms. The present study identified a heterotrophic nitrifier Proteus mirabilis strain V7, isolated from the coastal seawater. Almost 100 % of 82 mg L–1 NH4 +-N was removed within 48 h, while 51.2 % of total inorganic nitrogen was removed within 96 h after inoculation of Proteus mirabilis strain V7. Moreover, Proteus mirabilis strain V7 could remove NH4 +-N in a seawater matrix, but with much lower efficiency. Three water samples containing NH4 +-N at concentrations of 64.40, 18.00 and 9.82 mg L–1 were chosen to further test the NH4 +-N removal ability of Proteus mirabilis strain V7. All of the NH4 +-N was removed, with only a trace production of NO2 – and NO3 –. A putative subunit of ammonia monooxygenase from Proteus mirabilis strain V7, amoA Pm, was cloned and its mRNA level in the presence of NH4 + was characterized by real time reverse transcriptase PCR (RT-PCR). A 1.8-fold increase in the mRNA level of amoA Pm was observed, which indicated that AmoA may be involved in NH4 + oxidization. Our results indicated that Proteus mirabilis strain V7 could potentially be used as new resource for the treatment of NH4 +-N contaminated environments.
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Acknowledgements
This work was supported financially by the Innovation Projects of the Chinese Academy of Sciences grant KZCX2-EW-206, the Doctoral Foundation of Shandong Province grant BS2011SW056, the National Natural Science Foundation of China (NSFC) grant 31200041, and the 100 Talents Program of the Chinese Academy of Sciences.
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Zhang, W.W., Andong, Z.Y., Zhang, M. et al. Isolation and characterization of a heterotrophic nitrifier Proteus mirabilis strain V7 and its potential application in NH4 +-N removal. Ann Microbiol 64, 1231–1238 (2014). https://doi.org/10.1007/s13213-013-0764-0
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DOI: https://doi.org/10.1007/s13213-013-0764-0