Nitrogen isotope fractionation by alternative nitrogenases and past ocean anoxia.

@article{Zhang2014NitrogenIF,
  title={Nitrogen isotope fractionation by alternative nitrogenases and past ocean anoxia.},
  author={Xinning Zhang and Daniel M Sigman and François M M Morel and Anne M. L. Kraepiel},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2014},
  volume={111 13},
  pages={
          4782-7
        }
}
Biological nitrogen fixation constitutes the main input of fixed nitrogen to Earth's ecosystems, and its isotope effect is a key parameter in isotope-based interpretations of the N cycle. The nitrogen isotopic composition (δ(15)N) of newly fixed N is currently believed to be ∼-1‰, based on measurements of organic matter from diazotrophs using molybdenum (Mo)-nitrogenases. We show that the vanadium (V)- and iron (Fe)-only "alternative" nitrogenases produce fixed N with significantly lower δ(15)N… CONTINUE READING
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