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関連する概念動画

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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Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
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Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
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Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
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ガリウムを含む炭素ナノ熱計はガリウムを含んでいる.

Yihua Gao1, Yoshio Bando

  • 1Advanced Materials Laboratory and Nanomaterials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.

Nature
|February 8, 2002
PubMed
まとめ
この要約は機械生成です。

研究者は,炭素ナノチューブ内の液体ガリウムを使用してナノサーモメーターを開発しました. この装置は,50~500°Cの温度を正確に測定し,マイクロ環境の応用の可能性を示しています.

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科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • サーモメトリー温度計

背景:

  • 炭素ナノチューブ (CNT) は,新しいアプリケーションを可能にするユニークな特性を持っています.
  • さまざまなマイクロスケール環境では,正確な温度測定が不可欠です.
  • 信頼性の高いナノサーモメーターの開発は,継続的な科学的な課題です.

研究 の 目的:

  • 炭素ナノチューブに閉じ込められた液体ガリウムをナノ温度計として使用する可能性を調査する.
  • CNTsにおけるガリウムの温度依存的行動と熱膨張を決定する.
  • このナノ・サーモメーターがマイクロスケール温度センサーに適しているかどうかを評価する.

主な方法:

  • 液体ガリウムを精密に寸法された炭素ナノチューブ (約. 直径75nm,長さは最大10μm).
  • CNT内のガリウム柱の高さの変動を50~500°Cの温度範囲で観測し,測定する.
  • CNTにおけるガリウムの熱膨張係数をマクロスコープの同位体と比較する.

主要な成果:

  • 炭素ナノチューブ内の液体ガリウム柱の高さは,温度によって線形で再現可能な変化を示した.
  • CNTs内のガリウムの観測された熱膨張係数は,散発ガリウムのそれと一致しました.
  • ガリウムの幅広い液体範囲 (29.78〜2.403°C) と高温での低い蒸気圧により,理想的な熱指標となります.

結論:

  • 炭素ナノチューブに閉じ込められた液体ガリウムは,ナノ温度計として効果的に機能します.
  • このナノ・サーモメーターは,テストされた温度範囲 (50~500°C) で信頼性の高い性能を示しています.
  • CNTベースのナノサーモメーターは,多様なマイクロ環境における温度測定のための有望なツールです.