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関連する概念動画

Fluid Mosaic Model01:34

Fluid Mosaic Model

The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.LipidsThe most...
Membrane Fluidity01:23

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
Membrane Fluidity01:26

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...

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関連する実験動画

Updated: Jun 13, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
09:43

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

水/脂質界面における振動総周波数生成スペクトルスコピー:分子動力学シミュレーション研究.

Yuki Nagata1, Shaul Mukamel

  • 1University of California, Irvine, California 92617, USA. nagatay@uci.edu

Journal of the American Chemical Society
|April 17, 2010
PubMed
まとめ

総周波数生成 (SFG) スペクトロスコピーは,水/脂質界面で明確な水環境を明らかにします. 異なる水族群は独特のスペクトルサインを呈し,そのダイナミクスと脂質二重層との相互作用に影響を与えます.

科学分野:

  • 物理化学 物理化学
  • インタフェースサイエンスの科学
  • スペクトル顕微鏡検査です.

背景:

  • 接点における水の振る舞いを理解することは,生物学的および物質的なシステムにとって極めて重要です.
  • 総周波数生成 (SFG) スペクトロスコピーは,インターフェイス構造を検出するための強力な技術です.
  • 水と脂質のインターフェースは,ユニークな分子相互作用を持つ複雑な環境を提示します.

研究 の 目的:

  • 水/[1,2-ジミリストイル-sn-グリセロ-3-フォスファディチルコレイン] (DMPC) インターフェースにおける水の総周波数生成 (SFG) スペクトルをシミュレートし,分析する.
  • 観測されたスペクトルピークを,特定の水分子の環境と方向に割り当てます.
  • 水の構造,ダイナミクス,そして界面相互作用の関係を明らかにする.

主な方法:

  • 合計周波数生成 (SFG) は,OHのストレッチモード領域のスペクトルシミュレーションです.
  • 3590cm−1,3470cm−1,3290cm−1.3のスペクトルピークの分析
  • 頂点の割り当ては,ヘッドグループと隣接するDMPCグリセロールの脊髄と結合した水分子と,ほぼ散発した水に割り当てられます.

主要な成果:

  • 3つの異なるスペクトルピークが特定され,異なる水群に割り当てられました.

さらに関連する動画

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
08:49

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

Published on: December 1, 2023

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

関連する実験動画

Last Updated: Jun 13, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
09:43

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
08:49

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

Published on: December 1, 2023

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

  • DMPCのヘッドグループに隣接する水から3470cm−1のピークは,DMPCの方向性に影響された分離されたストレッチモードを示しています.
  • 3290cm−1のピークは,ほぼ大量の水から,隣接する水分子との強い結合を示しています.

    • 結論:

    • 異なるスペクトル特徴と結合ダイナミクスは,時間解析のSFG実験で観察された界面水の緩やかな緩和を説明します.
    • 水と脂質の界面における水分子の向きと動態は,脂質ヘッドグループによって著しく影響を受けます.
    • スペクトルピークの起源は,水/脂質と水/蒸気インターフェースの間で異なっており,インターフェース材料の重要性を強調しています.