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関連する概念動画

Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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 nitrate reductase...
The Nitrogen Cycle01:49

The Nitrogen Cycle

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...
Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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

2° Amines to N-Nitrosamines: Reaction with NaNO2

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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関連する実験動画

Updated: Jul 12, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
08:05

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Published on: October 7, 2020

13N-ラベル付きニートレートによるデニトリフィケーション研究

R Gersberg, K Krohn, N Peek

    Science (New York, N.Y.)
    |June 18, 1976
    PubMed
    まとめ

    新しい方法では,窒素-13でラベル付けされた窒素酸塩 ((13) NO (((3) ((-)) を使用して,水没した米畑の土壌における脱窒化率を正確に測定します. このトレーサー技術は,窒素濃度を変えることなく,短期的な定量分析を可能にします.

    科学分野:

    • 環境科学 環境科学
    • 土壌科学 土壌科学は,土壌の科学である.
    • 核化学 核化学とは

    背景:

    • デニトリフィケーションは,窒素循環における重要な微生物のプロセスです.
    • 脱窒化率の正確な測定は,土壌の生態系を理解するために不可欠です.
    • 既存の方法は,土壌状態を変化させたり,時間がかかることがあります.

    研究 の 目的:

    • 脱窒化率を定量化するための新しいトレーサー方法の開発と検証.
    • 新しい技術を用いて,水没した米畑からの土壌における脱窒素化を測定する.

    主な方法:

    • サイクロトロンを使った (16) O ((p,alpha) ((13) N反応を介して,窒素-13 ((13) NO (((3) ((-)) とラベル付けされた窒素酸塩の生成.
    • (13) NO 3 の利用は,デニトリフィケーションの直接的定量測定のためのトレーサーとして用いられる.
    • 自然の土壌システムにおける測定のための短い時間間隔を利用する.

    主要な成果:

    • トレーサーを成功裏に製造した (13NO3−)
    • 直接的,定量的な脱窒化率測定のための (13) N 技術の有用性を実証しました.
    • この方法が,in-situの窒素濃度を変えることなく,速度を測定する能力を実証した.

    さらに関連する動画

    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

    Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
    07:14

    Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

    Published on: December 20, 2016

    関連する実験動画

    Last Updated: Jul 12, 2026

    Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
    08:05

    Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

    Published on: October 7, 2020

    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

    Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
    07:14

    Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

    Published on: December 20, 2016

    結論:

    • (13) Nトレーサーテクニックは,脱窒化率を測定するための新しく効果的なアプローチを提供します.
    • この方法は,水没した米の土壌のような自然環境における短期的な定量的な評価に適しています.
    • この技術は,天然の窒素濃度の変化を避け,より信頼性の高いデータを提供します.