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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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Area of Science:

  • Microbiology
  • Environmental Science
  • Biochemistry

Background:

  • Nitrous oxide (N2O) is a significant greenhouse gas and a potential electron acceptor.
  • Understanding microbial metabolism involving N2O reduction is crucial for environmental applications.
  • Previous studies focused on N2O reduction with ammonium, but pathways coupled to N2 fixation are less explored.

Purpose of the Study:

  • To identify novel microbial metabolic pathways for N2O reduction.
  • To investigate the growth and efficiency of microbial cultures utilizing N2O as an electron acceptor in nitrogen-free conditions.
  • To compare biomass yields under different limiting substrates (N2O vs. acetate) in a nitrogen-fixing culture.

Main Methods:

  • Continuous microbial enrichment culture inoculated with activated sludge.
  • Use of N2O as the sole electron acceptor and acetate as the electron donor.
  • Nitrogen-free mineral medium to select for organisms potentially using N2O for nitrogen assimilation.
  • Cultivation in a chemostat under N2O-limiting and acetate-limiting conditions.

Main Results:

  • A microbial culture dominated by Rhodocyclaceae was successfully enriched.
  • The culture demonstrated growth via N2O reduction to N2 coupled with biological nitrogen fixation.
  • Biomass yields were 40% lower than a comparable culture using ammonium, attributed to the energy cost of N2 fixation.
  • No significant difference in biomass yield was observed between N2O-limiting and acetate-limiting conditions, unlike ammonium-amended cultures.

Conclusions:

  • Microbial N2O reduction can be coupled to N2 fixation, representing a novel metabolic pathway.
  • This coupling influences microbial biomass yield and substrate utilization efficiency.
  • The findings contribute to understanding microbial responses to N2O in nitrogen-limited environments.