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Related Concept Videos

Metabolism of Chemolithotrophs01:15

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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Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
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Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
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Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
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Related Experiment Video

Updated: Oct 7, 2025

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
07:59

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Published on: December 6, 2018

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Archaeal nitrification without oxygen.

Willm Martens-Habbena1, Wei Qin2

  • 1Department of Microbiology and Cell Science, University of Florida, Institute for Food and Agricultural Sciences, Fort Lauderdale Research and Education Center, Davie, FL 33314, USA.

Science (New York, N.Y.)
|January 6, 2022
PubMed
Summary
This summary is machine-generated.

This single-cell organism uniquely produces its own oxygen. This allows it to perform essential ammonia oxidation processes independently.

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions
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Related Experiment Videos

Last Updated: Oct 7, 2025

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions
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Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions

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Area of Science:

  • Microbiology
  • Biochemistry
  • Environmental Science

Background:

  • Ammonia oxidation is a critical process in the nitrogen cycle.
  • Many organisms require external oxygen sources for ammonia oxidation.
  • The metabolic capabilities of single-cell organisms are diverse.

Purpose of the Study:

  • To investigate the metabolic pathways of a novel single-cell organism.
  • To determine if the organism can self-produce oxygen.
  • To understand the implications of endogenous oxygen production for ammonia oxidation.

Main Methods:

  • Culturing of the single-cell organism under controlled conditions.
  • Gas chromatography to measure oxygen production.
  • Isotope labeling to trace metabolic pathways.
  • Biochemical assays to confirm ammonia oxidation.

Main Results:

  • The single-cell organism demonstrated the ability to produce oxygen internally.
  • Oxygen production was directly linked to the organism's metabolic activity.
  • The organism successfully performed ammonia oxidation using self-produced oxygen.
  • This process was independent of external oxygen supply.

Conclusions:

  • This discovery reveals a unique metabolic strategy in single-cell life.
  • The organism's self-oxygenating capability has significant implications for understanding microbial ecosystems.
  • This finding opens new avenues for research in bioenergetics and biogeochemical cycles.