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Denitrification: microbiology and ecology.

R Knowles1

  • 1Department of Natural Resource Sciences, McGill University, Ste. Anne de Bellevue, Canada.

Life Support & Biosphere Science : International Journal of Earth Space
|January 1, 1996
PubMed
Summary

Microorganisms can use nitrogen oxides for respiration in low-oxygen environments, a process called denitrification. Predicting denitrification rates and intermediate gas release, like nitrous oxide, remains challenging.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Biogeochemistry

Background:

  • Aerobic microorganisms utilize nitrogen oxides, particularly nitrate, as electron acceptors for respiration under oxygen-limiting conditions.
  • This process, known as denitrification, allows microbial growth but is less efficient than oxygen respiration, resulting in slower growth rates.
  • The biochemical pathways of denitrification are moderately understood and found across diverse bacterial and fungal species.

Purpose of the Study:

  • To explore the microbial process of denitrification.
  • To identify key factors regulating denitrification.
  • To understand the challenges in predicting denitrification rates and intermediate byproduct formation.

Main Methods:

  • Review of existing knowledge on microbial denitrification.
  • Analysis of factors influencing nitrogen oxide reduction.
  • Examination of biochemical mechanisms and environmental controls.

Main Results:

  • Denitrification is a widespread microbial adaptation to low-oxygen environments.
  • Key regulators include nitrogen oxide availability, reductant supply (organic/inorganic compounds), and low oxygen concentrations.
  • Environmental factors like water content, pH, porosity, and inhibitors influence denitrification and can lead to intermediate accumulation.

Conclusions:

  • Denitrification is a crucial process for microbial survival in anoxic conditions.
  • Predicting the environmental rates of denitrification and the release of gaseous intermediates, such as nitrous oxide, is complex and difficult.

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