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Related Concept Videos

Sulfur Assimilation01:20

Sulfur Assimilation

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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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Inorganic Nitrogen Assimilation01:22

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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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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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Carbon-dioxide Fixation01:28

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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Environmental Applications of Microorganisms01:30

Environmental Applications of Microorganisms

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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Bioremediation00:46

Bioremediation

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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Decreasing ruminal methane production through enhancing the sulfate reduction pathway.

Yuchao Zhao1, Guangyong Zhao1

  • 1State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, 100193, Beijing, China.

Animal Nutrition (Zhongguo Xu Mu Shou Yi Xue Hui)
|May 23, 2022
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Summary

Reducing methane (CH4) from ruminants is key for sustainability. Enhancing sulfate-reducing bacteria activity in the rumen effectively lowers CH4 emissions, offering a promising mitigation strategy.

Keywords:
MethaneRumenSulfate reduction pathwaySulfur

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Microbiology

Background:

  • Ruminant methane (CH4) production contributes significantly to global greenhouse gas emissions and feed energy loss.
  • Hydrogen (H2) is the primary substrate for ruminal methanogenesis, making it a target for mitigation.
  • Sulfate-reducing bacteria (SRB) compete with methanogens for H2, offering a biological control strategy.

Purpose of the Study:

  • To review the impact of sulfate and elemental sulfur on ruminal methanogenesis.
  • To elucidate the mechanisms by which sulfate and elemental sulfur affect SRB activity.
  • To identify strategies for mitigating ruminant methane emissions by enhancing the sulfate-reducing pathway.

Main Methods:

  • Literature review on the effects of sulfate and elemental sulfur on ruminal methanogenesis.
  • Analysis of the impact of sulfur compounds on key ruminal sulfate-reducing bacteria.
  • Evaluation of dietary strategies for enhancing SRB activity.

Main Results:

  • Dietary sulfate and elemental sulfur addition can inhibit ruminal methanogenesis.
  • Enhancing the activity of SRB, such as *Desulfovibrio*, *Desulfohalobium*, and *Sulfolobus*, effectively reduces CH4 emissions.
  • Dried distillers grains with solubles also show potential in promoting SRB activity.

Conclusions:

  • Enhancing ruminal sulfate reduction is a viable strategy to mitigate methane emissions from ruminants.
  • Dietary interventions with sulfur sources and specific feed components can modulate SRB populations and activity.
  • Further research is needed to determine optimal sulfur levels for methane reduction without compromising animal health and performance.