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Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes
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Identifying and Quantifying the Intermediate Processes during Nitrate-Dependent Iron(II) Oxidation.

James Jamieson1,2, Henning Prommer1,3,2, Anna H Kaksonen2,4

  • 1School of Earth Sciences , University of Western Australia , Crawley , Western Australia 6009 , Australia.

Environmental Science & Technology
|April 21, 2018
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Summary
This summary is machine-generated.

Nitrate-dependent iron oxidation (NDFO) is significantly driven by microbial enzymatic activity, not just chemical processes. This study quantifies microbial contributions, confirming biological pathways are key in subsurface iron cycling.

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Area of Science:

  • Geochemistry
  • Microbiology
  • Environmental Science

Background:

  • Nitrate-dependent iron oxidation (NDFO) is crucial in subsurface environments.
  • The precise role of biological vs. abiotic processes in NDFO remains debated.
  • Isolation of neutrophilic iron-oxidizing and nitrate-reducing autotrophs is lacking.

Purpose of the Study:

  • Quantify the relative contributions of biotic and abiotic processes in NDFO.
  • Investigate the role of chemical denitrification and organic ligands in Fe(II) oxidation.
  • Verify the existence and significance of enzymatic Fe(II) oxidation by NDFO bacteria.

Main Methods:

  • Compilation and model-based interpretation of published experimental data.
  • Assessment of the kinetics of chemical denitrification by Fe(II) (chemodenitrification).
  • Quantification of Fe(II) oxidation attributed to enzymatic pathways versus abiotic factors.

Main Results:

  • Organic ligands, like bacterial exopolymeric substances, enhance abiotic Fe(II) oxidation.
  • Nitrite alone cannot account for the observed Fe(II) oxidation rates.
  • 60-75% of Fe(II) oxidation was attributed to enzymatic pathways in studied strains.

Conclusions:

  • Abiotic Fe(II) oxidation is not solely responsible for NDFO.
  • Biological Fe(II) oxidation catalyzed by NDFO bacteria is a key process.
  • This study verifies the significant contribution of enzymatic pathways to NDFO.