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関連する概念動画

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
797
Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

814
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
814
Alternative RNA Splicing02:18

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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.
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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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Electron Carriers01:24

Electron Carriers

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Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
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Updated: Feb 6, 2026

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays
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Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays

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交互にねじれた、電子豊富なリレンとその安定なカチオン

Zhitao Sun1, Rui Liu1, Wei Fan1

  • 1Department of Chemistry, National University of Singapore, Singapore.

Angewandte Chemie (International ed. in English)
|February 4, 2026
PubMed
まとめ
この要約は機械生成です。

通常は凝集する長鎖リレン分子の合成を、骨格にねじれを導入することで達成した。この方法により、光学特性を調整可能でユニークな電子挙動を示す分子が得られ、新しい材料への道を開く。

キーワード:
電子豊富なπシステムグラフェンナノリボンラジカルカチオンリレンねじれた分子

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Magnetic Tweezers for the Measurement of Twist and Torque
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Last Updated: Feb 6, 2026

Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays
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Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays

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科学分野:

  • 有機化学
  • 材料科学
  • 超分子化学

背景:

  • 長鎖リレンの溶液合成は、凝集のため困難です。
  • 骨格のねじれは、凝集を緩和し、キラリティを導入することができます。

研究 の 目的:

  • 凝集を低減した新規の長鎖リレン分子を合成すること。
  • 骨格のねじれと置換基が分子特性に与える影響を調査すること。

主な方法:

  • 段階的なクロスカップリング反応。
  • 制御された酸化的脱水素。
  • X線結晶構造解析、1H NMR、およびACID解析。

主要な成果:

  • ツイストした骨格とn-ブトキシ置換基を持つ、八量体までのリレン分子を合成することに成功しました。
  • 複数のテトラ(n-ブトキシ)モチーフを持つリレンにおける、交互のP/Mヘリシティを観測しました。
  • 長さ依存性の光学特性（可視光から近赤外光）と、ラジカルカチオン/ジカチオンの容易な形成を実証しました。
  • ジカチオンにおける局所的芳香族性から全体的芳香族性への進化を明らかにしました。

結論:

  • 開発された合成戦略は、長鎖リレン合成における凝集の問題を効果的に克服します。
  • ねじれたリレン構造は、ユニークならせん状のコンフォメーションと調整可能な光電子特性を示します。
  • 電子豊富な性質と酸化形態の安定性は、電子用途に有望です。