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相关概念视频

Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Aquaporins01:25

Aquaporins

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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Cohesion01:07

Cohesion

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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Hydrolysis01:15

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Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
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Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
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在氨酸-DPPC接口中的异质水动力学.

Anirban Paul1, Jaydeb Chakrabarti1,2

  • 1Department of Physics of Complex Systems, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700106, India. anirbanpaulhdb@gmail.com.

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氨酸 (HA) 与水和脂质的相互作用影响细胞力学. 分子动力学揭示HA-脂质接口的水动力学显示异质性,扩散受HA度的影响,但不是链条长度.

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科学领域:

  • 生物物理学的生物物理.
  • 材料科学 材料科学 材料科学
  • 计算生物学 计算生物学

背景情况:

  • 氨酸 (HA) 对于细胞结构和功能至关重要,与脂质和水相互作用.
  • 改变HA特性与结肠癌和骨关节炎等疾病有关,影响细胞机制.
  • 在HA-水和脂质界面上的微观动力学尚未得到充分理解.

研究的目的:

  • 为了研究氨酸 (HA) 和二聚胺酸胆 (DPPC) 脂质双层之间的界面上的水分子的动态特性.
  • 阐明HA度和链条长度对分子层面的水动态的影响.

主要方法:

  • 利用分子动力学 (MD) 模拟来建模HA-DPPC脂质双层系统.
  • 分析了使用非高斯自动范霍夫函数的界面和水化水动态.
  • 通过扩散性分布检查了转换和旋转动力学.

主要成果:

  • 接口和水化水表现出动态异质性,由非高斯自动范霍夫函数表示.
  • 扩散率分布显示了界面水和补水水之间明显的转换和旋转动态.
  • 界面上的水扩散系数随着HA度的增加而下降,但对HA链长度的依赖性很弱.
  • 亚扩散水化层中的水动力学受到HA存在的最小影响.

结论:

  • 这项研究揭示了在HA-脂质界面上水的显著动态异质性.
  • HA度是调节界面上的水扩散的一个关键因素,而链条长度的影响较小.
  • 这些发现为HA在细胞力学和疾病状态中的作用提供了分子层面的见解.