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関連する概念動画

Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
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Polarity of the Cytoskeleton01:18

Polarity of the Cytoskeleton

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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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Microbial Morphologies01:29

Microbial Morphologies

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Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...
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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
17.1K

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Cyanostar マクロサイクルの形状持続性と共存する柔軟性

Yun Liu1, Abhishek Singharoy2, Christopher G Mayne2

  • 1Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, IN 47405, USA.

Journal of the American Chemical Society
|March 26, 2016
PubMed
まとめ

シアノスターのような 柔軟で形状の固いマクロサイクルは 伝統的な定義に異議を唱えます この研究では 柔軟な分子は 形状が一貫していることが示され,その様々な形状が 類似した形状を維持し,マクロサイクルの設計の範囲を広げている.

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科学分野:

  • 超分子化学
  • 有機化学
  • コンピュータ化学

背景:

  • 形状持続的なマクロサイクルは,伝統的に硬さと低い形状の柔軟性によって定義されます.
  • この研究はこれらの定義を 柔軟で形状の固有の分子という文脈で再評価しています

研究 の 目的:

  • マクロサイクルの柔軟性,形状の持続性,および機能の関係を調べる.
  • 柔軟な星状のマクロサイクルの 形状の振る舞いを調べるため
  • 柔軟なマクロサイクルを含むように形状の持続性の定義を拡張する.

主な方法:

  • 分子ダイナミクス (MD) シミュレーション
  • 密度関数理論 (DFT) の計算
  • 核磁共振 (NMR) スペクトロスコーピー

主要な成果:

  • Cyanostarは,オレフィン群の急速な相互変換により,アクセス可能なコンフォマー332を示しています.
  • 柔軟性にもかかわらず シアノスターは 形状の類似性を87%維持し 形状の持続性を確認しています
  • ゲスト誘発結合 (ディグライム) は形状空間に影響を及ぼしますが,複雑な形成は硬さを高めます.

結論:

  • 柔軟なマクロサイクルは,そのコンフォマーが高い形状の類似性を示す場合,形状持続性と考えられます.
  • この発見は,分子認識と自己組み立てにおける機能的なマクロサイクルの設計原理を広げる.