Biogeosciences
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Articles | Volume 23, issue 18
Articles | Volume 23, issue 18
https://doi.org/10.5194/bg-23-6705-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-6705-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 18
Research article
 | 
24 Sep 2026
Research article |  | 24 Sep 2026

High nitrous oxide isotopic variability during denitrification by Pseudomonas species bearing NirK and NirS

Noémy Chénier, Paul M. Magyar, Jakob Zopfi, Claudia Frey, Thomas Kuhn, Moritz F. Lehmann, and Joachim Mohn

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Short summary
N₂O is a greenhouse gas produced by microbes during nitrogen cycling. We studied two bacterial species and found that the isotope signatures of the N₂O they produced changed strongly depending on growth conditions and cell activity. Early during growth, the distribution of N isotopes within the N₂O molecule also changed unexpectedly. These results show that N₂O isotope signatures are more variable than previously assumed and depend strongly on physiology.
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