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関連する概念動画

Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
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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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The Nitrogen Cycle01:49

The Nitrogen Cycle

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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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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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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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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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関連する実験動画

Updated: Mar 29, 2026

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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ニトロスピラ菌による完全な窒化

Holger Daims1, Elena V Lebedeva2, Petra Pjevac1

  • 1Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.

Nature
|November 27, 2015
PubMed
まとめ
この要約は機械生成です。

研究者達が発見した新種の細菌は 完全に窒素化し アモニアを窒素化します この発見は,窒素化が2段階のプロセスであるという長年の見解に異議を唱え,窒素循環におけるニトロスピラの役割を強調しています.

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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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Last Updated: Mar 29, 2026

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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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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A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
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科学分野:

  • 微生物学
  • 環境科学
  • 生物化学

背景:

  • ナトリフィケーションは窒素循環に不可欠であり,伝統的に2段階のプロセスとして見られています.
  • アンモニアの酸化と窒素の酸化を司る微生物は別物と考えられた.
  • 完全な窒素化のエネルギー上の利点は,単一の生物が両方のステップを実行できることを示唆しました.

研究 の 目的:

  • 窒素化における 機能的分離の百年のパズルを 調べるために
  • 完全に窒素化できる微生物を発見し 培養する
  • 完全な窒素化の遺伝的基礎と生態学的意義を理解する.

主な方法:

  • ニトロスピラ属の新種の細菌の分離と培養
  • 代謝経路を特定するゲノム分析
  • 環境サンプルのメタゲノミクス分析

主要な成果:

  • ニトロスピラ属の 完全に窒素化する細菌の発見と培養
  • ゲノム解析により,この有機体におけるアンモニアとニートリートの酸化経路が明らかになった.
  • アンモニア・モノオキシゲナーゼとヒドロキシラミン脱水素酵素の遺伝子は,ニトロスピラと環境のメタゲノムで発見されました.

結論:

  • 完全に窒素化するニトロスピラは 確立された2段階の窒素化モデルに挑戦します
  • これらの生物は,成長過程で,同時にアンモニアを窒素化して活性化します.
  • 完全に窒素化するニトロスピラは,世界の窒素循環微生物のコミュニティで重要な役割を果たしています.