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関連する概念動画

Alternative RNA Splicing02:18

Alternative RNA Splicing

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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Alternative RNA Splicing02:18

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Null and Alternative Hypotheses01:16

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The actual hypothesis testing begins by considering two hypotheses. They are termed  the null hypothesis and the alternative hypothesis. These hypotheses contain opposing viewpoints.
The null hypothesis, denoted by H0 is a statement of no difference between the variables—they are not related. This can often be considered the status quo. As  a result if you cannot accept the null, it requires some action.
The alternative hypothesis, denoted by H1 or Ha, is a claim about the...
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Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...
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When analyzing the behavior of structures, engineers often rely on the concept of equilibrium. This refers to the state where all forces and moments acting on a system balance each other, resulting in no net movement or rotation. In many cases, equilibrium can be described by a set of standard equations. However, in some situations, alternative sets of equilibrium equations must be used to describe the system's behavior accurately.
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フォームミディニウムニトロフォーマット:無感性のRDXの代替品

Amanda F Baxter1, Igor Martin1, Karl O Christe1

  • 1Loker Hydrocarbon Research Institute and Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States.

Journal of the American Chemical Society
|October 24, 2018
PubMed
まとめ

研究者たちは窒素を含有したカチオンで 5 つのニトロフォーマット塩を合成しました フォーマミディニウム塩はRDXのような性能を示し,感度が著しく低いので,より安全なエネルギー材料の代替品として示唆されます.

科学分野:

  • 材料科学
  • 化学について
  • エネルギー物質

背景:

  • 安全性プロファイルが向上した新しいエネルギー材料の開発は不可欠です.
  • ニトロフォーマット塩は,潜在的エネルギー用途を持つ化合物のクラスです.
  • 窒素を含むカチオンの研究は,塩の性質に影響を与えることができます.

研究 の 目的:

  • 窒素含有カチオンを持つ5つの新しいニトロフォーマット塩を合成し,特徴づけること.
  • これらの新しいエネルギー材料の性能と感性を評価する.
  • RDXのような 既存のエネルギー物質の 代替品を特定するためです

主な方法:

  • 5つのニトロフォーマット塩の合成
  • 複数核のNMR,IR,ラーマン光譜,単結晶X線分析を用いた特徴付け.
  • 微分熱分析と感度試験 (摩擦と衝撃) による熱安定性の評価
  • ガウシアン4複合法による熱化学計算
  • チャップマン・ジョーゲート熱力学爆発理論を用いた性能予測

主要な成果:

  • 5つのニトロフォーマット塩の準備と総合的な特徴付けを成功させた.

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  • [CH ((NH2) 2) + [C ((NO2) 3) ]というホルマミジウム塩は,RDX (研究部門の爆発物,サイクロトリメチルネトリニトラミン) と比較できる性能を示した.
  • このホルマミドニウム塩は,RDXと比較して衝撃と摩擦に対する感度が著しく低下した.
  • 結論:

    • フォーマミドニウムニトロフォーマート塩は有望なエネルギー材料候補である.
    • 高性能と感度低下の組み合わせにより RDXの優れた代替品となる可能性があります.
    • この化合物のさらなる調査により,より安全なエネルギー成分が得られます.