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The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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均衡する2Dおよび3D自己組み立ての間の静電結合.

Fredric M Menger1, Lei Shi

  • 1Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA. menger@emory.edu

Journal of the American Chemical Society
|May 14, 2009
PubMed
まとめ
この要約は機械生成です。

表面張力を用いたクリティカルミセル濃度 (CMC) の測定は誤解を招く可能性があります. 添加物は,空気/水インターフェイスを飽和させ,ドデシルトリメチルアモニウムブロミド (DTAB) とアニオン添加物でみられるように,誤ったCMC読み取りを引き起こす可能性があります.

さらに関連する動画

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

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07:26

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

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科学分野:

  • コロイドと表面の化学
  • 物理化学 物理化学
  • マテリアルサイエンス 材料科学

背景:

  • ドデシルトリメチラモニウムブロミド (DTAB) などのカチオン性表面活性剤が広く使用されています.
  • 臨界ミセル濃度 (Critical micelle concentration,CMC) は,通常,表面張力測定によって決定される重要なパラメータである.
  • DTABの集積行動に対するアニオン添加物の影響は,著しい関心を持っています.

研究 の 目的:

  • 異なる電荷を持つアニオン添加物のDTABのCMCに対する影響を調査する.
  • 表面張力で得られたCMCと大量特性の測定の間の不一致を調和させるため.
  • 表面張力破裂はミセル形成を直接示すという普遍的な仮定に異議を唱えるため.

主な方法:

  • DTABと6つの有機アニオン添加物による溶液の調製,モール比15:1
  • 表面張力測定は,表面的なCMCを決定するために行われます.
  • 伝導性と拡散 核磁気共振 (NMR) 測定を散発性特性分析のために行います.
  • 空気/水界面におけるDTAB/トリアニオン複合体の形成の分析.

主要な成果:

  • 表面張力プロットは,アニオン添加物の存在で,明らかなCMC (10倍まで) の有意な減少を示しました.
  • 導電性および拡散性NMR測定は,DTAB/トリアニオン混合物の正常なCMC値 (約14 mM) を示した.
  • 表面張力で得られたCMCと大量測定,特にヘクサニオンとの間に不一致が観察されました.

結論:

  • 空気/水界面は,実際のミセル形成濃度を下回るDTAB/アニオン添加物複合体で飽和することがあります.
  • CMCのプロットにおける表面張力破裂は,必ずしも真のミセル形成を示すわけではない.
  • 特定の添加物の存在における表面張力データの解釈を再考することは,正確なコロイド化学分析のために必要である.