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相关概念视频

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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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

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Published on: November 21, 2013

在平衡的2D和3D自组件之间进行静电结合.

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
概括
此摘要是机器生成的。

使用表面张力的临界微粒度 (CMC) 测量可能具有误导性. 添加剂可以使空气/水接口和,导致错误的CMC读数,如多二甲基三甲化物 (DTAB) 和离子添加剂所见.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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科学领域:

  • 合体和表面化学
  • 物理化学 物理化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 广泛使用的是像二甲基三甲基化物 (DTAB) 这样的阴离子表面活性剂.
  • 临界微粒度 (CMC) 是一个关键参数,通常通过测量表面张力来确定.
  • 阴离子添加剂对DTAB聚合行为的影响具有显著的意义.

研究的目的:

  • 研究不同电荷的阳离子添加剂对DTAB的CMC的影响.
  • 为了协调表面张力衍生的CMC和散装性质测量之间的差异.
  • 为了挑战普遍的假设,表面张力断裂直接表明菌形成.

主要方法:

  • 用DTAB和六种有机阳离子添加剂制备溶液,其摩尔比为15:1.
  • 测量表面张力以确定明显的CMC.
  • 导电性和扩散 核磁共振 (NMR) 测量用于散装属性分析.
  • 在空气/水界面上对DTAB/trianion复合体形成的分析.

主要成果:

  • 表面张力图显示,在离子添加剂的存在下,明显的CMC显著下降 (高达10倍).
  • 导电性和扩散性NMR测量给出了DTAB/trianion混合物的正常CMC值 (大约14mM).
  • 在表面张力衍生的CMC和散装测量之间观察到差异,特别是与hexanion.

结论:

  • 空气/水界面可能会和DTAB/阴离子添加剂复合物,低于实际的微粒形成度.
  • 在CMC图中表面张力断裂可能并不总是表明真正的菌形成.
  • 为了准确的合物化学分析,需要重新考虑在特定添加剂的存在下对表面张力数据的解释.