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Related Concept Videos

Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

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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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Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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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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Environmental Applications of Microorganisms01:30

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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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Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
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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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Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
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Microbial autotrophy explains large-scale soil CO2 fixation.

Hao Liao1,2, Xiuli Hao1,2, Fei Qin1,2

  • 1State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.

Global Change Biology
|October 13, 2022
PubMed
Summary
This summary is machine-generated.

Soil microbes, especially autotrophs, are key to atmospheric carbon dioxide (CO2) fixation. This study quantifies their large-scale impact on soil CO2 uptake, crucial for understanding global carbon cycling.

Keywords:
CO2 fixation rateautotrophic bacteriabiogeographic patternphototrophic protistssoil carbon cycling

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Area of Science:

  • Soil Ecology
  • Microbial Ecology
  • Biogeochemistry

Background:

  • Microbial communities are vital for carbon cycling, yet their large-scale distribution and drivers remain unclear.
  • Understanding soil carbon fixation is crucial for predicting climate change impacts.

Purpose of the Study:

  • To investigate the large-scale variations and drivers of soil microbial communities involved in carbon fixation across China.
  • To quantify the contribution of terrestrial autotrophic microbes to soil CO2 fixation.

Main Methods:

  • Conducted a large-scale survey across diverse soil types in China.
  • Analyzed the correlation between CO2 fluxes and microbial community composition, focusing on autotrophic organisms.
  • Assessed the influence of environmental factors like precipitation and pH.

Main Results:

  • Soil autotrophic organisms, particularly bacteria and phototrophic protists, are critical drivers of CO2 fixation.
  • Paddy soils exhibit significantly higher CO2 fixation rates (four-fold) compared to upland and forest soils due to a greater abundance of obligate autotrophs.
  • Precipitation, pH, and specific microbial ecological clusters significantly influence CO2 fixation rates.

Conclusions:

  • Terrestrial autotrophic microbes play a substantial, quantifiable role in soil CO2 fixation.
  • This research provides novel insights into microbial contributions to carbon sequestration.
  • Findings have implications for global carbon regulation strategies in the context of climate change.