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Metabolism of Chemolithotrophs

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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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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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Ecological dynamics explain modular denitrification in the ocean.

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PubMed
Summary
This summary is machine-generated.

Marine microbes drive key nitrogen loss and nitrous oxide production through multistep denitrification. This study reveals how diverse microbial communities and environmental factors shape these crucial ocean processes.

Keywords:
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Area of Science:

  • Marine microbial ecology
  • Biogeochemical cycles
  • Biogeochemistry

Background:

  • Marine oxygen minimum zones (OMZs) host microorganisms crucial for global biogeochemical processes.
  • Multistep denitrification (NO3-→NO2-→NO→N2O→N2) in OMZs significantly impacts nitrogen loss and nitrous oxide (N2O) production.
  • Current models often simplify denitrification as a single step, overlooking the prevalence of partial pathways (modules) in OMZ denitrifiers.

Purpose of the Study:

  • To identify ecological mechanisms sustaining diverse denitrifiers in OMZs.
  • To explain the prevalence of specific denitrification modules within OMZ microbial communities.
  • To examine the implications of these microbial strategies for nitrogen loss and N2O production.

Main Methods:

  • Developed an idealized OMZ ecosystem model incorporating microbial functional types.
  • Described denitrifier modules based on redox chemistry and thermodynamic constraints.
  • Applied pathway length penalties to model microbial growth yields and community succession.

Main Results:

  • Microbial biomass yields increase along the denitrification pathway under organic matter limitation, explaining the survival of intermediate-metabolizing populations.
  • Predicted denitrifier community succession correlated with environmental gradients (organic matter vs. nitrogen limitation).
  • The model successfully explained the observed dominance and oxygen tolerance of the NO3-→NO2- module and identified NO3- as the primary N2O source.

Conclusions:

  • Microbial ecology and functional diversity are critical for understanding nitrogen cycling in OMZs.
  • The study provides a mechanistic framework for the relationship between microbial community structure and biogeochemical process rates.
  • The findings advance our understanding of nitrogen loss and N2O production in OMZs and can be applied to other environments.