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関連する概念動画

The Nitrogen Cycle01:49

The Nitrogen Cycle

60.7K
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...
60.7K
Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

11.5K
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...
11.5K
Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

75.9K
Oxidation–Reduction Reactions
75.9K
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

576
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...
576
Fixation and Sectioning01:03

Fixation and Sectioning

8.0K
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
8.0K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

7.1K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
7.1K

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関連する実験動画

Updated: Feb 14, 2026

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

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窒素の固定とボロンへの還元

Marc-André Légaré1,2, Guillaume Bélanger-Chabot1,2, Rian D Dewhurst1,2

  • 1Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.

Science (New York, N.Y.)
|February 24, 2018
PubMed
まとめ
この要約は機械生成です。

科学者は非金属の二酸化ボリレンを用いて二酸化窒素 (N2) の固定と還元を達成した. この画期的な研究は,伝統的な金属ベースの触媒を超えて,窒素化学の新しい道を開きます.

さらに関連する動画

Negative Additive Manufacturing of Complex Shaped Boron Carbides
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Negative Additive Manufacturing of Complex Shaped Boron Carbides

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Regioselective O-Glycosylation of Nucleosides via the Temporary 2',3'-Diol Protection by a Boronic Ester for the Synthesis of Disaccharide Nucleosides
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Regioselective O-Glycosylation of Nucleosides via the Temporary 2',3'-Diol Protection by a Boronic Ester for the Synthesis of Disaccharide Nucleosides

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関連する実験動画

Last Updated: Feb 14, 2026

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
13:09

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

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Negative Additive Manufacturing of Complex Shaped Boron Carbides
06:45

Negative Additive Manufacturing of Complex Shaped Boron Carbides

Published on: September 18, 2018

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Regioselective O-Glycosylation of Nucleosides via the Temporary 2',3'-Diol Protection by a Boronic Ester for the Synthesis of Disaccharide Nucleosides
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Regioselective O-Glycosylation of Nucleosides via the Temporary 2',3'-Diol Protection by a Boronic Ester for the Synthesis of Disaccharide Nucleosides

Published on: July 26, 2018

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科学分野:

  • 無機化学
  • 有機金属化学
  • カタリシス

背景:

  • 窒素 (N2) の固定と機能化は,生命と産業にとって極めて重要です.
  • 現在,金属ベースの化合物だけが非マトリックス条件下でN2変換を達成することが知られている.
  • N2化学のための非金属の代替物の開発は,重要な課題である.

研究 の 目的:

  • N2結合と還元における非金属化合物,特にディコーディネートボリレンの可能性を調査する.
  • ボリレンから派生した異なる窒素を含む製品の形成と相互変換を調査する.
  • これらの新しい非金属性窒素化合物の構造と性質を特徴づける.

主な方法:

  • カリウム・グラファイトを還元剤として使った二酸化ボリレンと二酸化窒素 (N2) の反応
  • 詳細なスペクトロスク分析のためのNラベル付き同位体の準備.
  • 構造の解明のための光譜技術 (NMRを含む) と結晶学的分析.

主要な成果:

  • 非金属化合物であるディコーディネートボリレンによるN2結合と還元の観察.
  • 中性 (B2N2) とダイアニオン ([B2N2]2-) 産物の形成,再酸化反応によって相互変換可能である.
  • ダイアニオン種のプロトン化によるダイラジカル製品 (B2N2H2) の合成と特徴付け.

結論:

  • ダイナトゲン (N2) の固定と還元のための最初の非金属ベースのシステムを実証した.
  • ダイコーディネートボリレンを用いたN2化学の新たな経路を確立した.
  • 窒素変換のための非金属触媒の設計のための新しい可能性を開いた.