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@ARTICLE{Liu:841296,
      author       = {Liu, Shurong and Han, Ping and Hink, Linda and Prosser,
                      James I. and Wagner, Michael and Brüggemann, Nicolas},
      title        = {{A}biotic {C}onversion of {E}xtracellular {NH} 2 {OH}
                      {C}ontributes to {N} 2 {O} {E}mission during {A}mmonia
                      {O}xidation},
      journal      = {Environmental science $\&$ technology},
      volume       = {51},
      number       = {22},
      issn         = {1520-5851},
      address      = {Columbus, Ohio},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2017-08386},
      pages        = {13122 - 13132},
      year         = {2017},
      abstract     = {Abiotic processes involving the reactive ammonia-oxidation
                      intermediates nitric oxide (NO) or hydroxylamine (NH2OH) for
                      N2O production have been indicated recently. The latter
                      process would require the availability of substantial
                      amounts of free NH2OH for chemical reactions during ammonia
                      (NH3) oxidation, but little is known about extracellular
                      NH2OH formation by the different clades of ammonia-oxidizing
                      microbes. Here we determined extracellular NH2OH
                      concentrations in culture media of several ammonia-oxidizing
                      bacteria (AOB) and archaea (AOA), as well as one complete
                      ammonia oxidizer (comammox) enrichment (Ca. Nitrospira
                      inopinata) during incubation under standard cultivation
                      conditions. NH2OH was measurable in the incubation media of
                      Nitrosomonas europaea, Nitrosospira multiformis,
                      Nitrososphaera gargensis, and Ca. Nitrosotenuis uzonensis,
                      but not in media of the other tested AOB and AOA. NH2OH was
                      also formed by the comammox enrichment during NH3 oxidation.
                      This enrichment exhibited the largest NH2OH:final product
                      ratio $(1.92\%),$ followed by N. multiformis $(0.56\%)$ and
                      N. gargensis $(0.46\%).$ The maximum proportions of NH4+
                      converted to N2O via extracellular NH2OH during incubation,
                      estimated on the basis of NH2OH abiotic conversion rates,
                      were $0.12\%,$ $0.08\%,$ and $0.14\%$ for AOB, AOA, and Ca.
                      Nitrospira inopinata, respectively, and were consistent with
                      published NH4+:N2O conversion ratios for AOB and AOA.},
      cin          = {IBG-3},
      ddc          = {050},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29039187},
      UT           = {WOS:000416496700007},
      doi          = {10.1021/acs.est.7b02360},
      url          = {https://juser.fz-juelich.de/record/841296},
}