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相关概念视频

Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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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.
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The Equilibrium Binding Constant and Binding Strength02:18

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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:
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Chemical Shift: Internal References and Solvent Effects01:17

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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The Small x Assumption02:20

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If a reaction has a small equilibrium constant, the equilibrium position favors the reactants. In such reactions, a negligible change in concentration may occur if the initial concentrations of reactants are high and the Kc value is small. In such circumstances, the equilibrium concentration is approximately equal to its initial concentration.  This estimation can be used to simplify the equilibrium calculations by assuming that some equilibrium concentrations are equal to the initial...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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基数组不完整性 固定节点扩散中的错误 关于非共价相互作用的蒙特卡罗计算

Kousuke Nakano1, Benjamin X Shi2, Dario Alfè3,4,5

  • 1Center for Basic Research on Materials, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan.

Journal of chemical theory and computation
|April 30, 2025
PubMed
概括
此摘要是机器生成的。

基本集不完整性错误 (BSIE) 显著影响固定节点扩散蒙特卡洛 (FN-DMC) 的约束性能源计算. 使用增强基础集或扩散函数可以有效地减少这些错误,以获得准确的结果.

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科学领域:

  • 量子化学 是一个量子化学.
  • 计算物理 计算物理

背景情况:

  • 基础集不完整性错误 (BSIE) 是量子化学中一个已知的问题.
  • 固定节点扩散蒙特卡罗 (FN-DMC) 通常被认为对BSIE的敏感性较小.
  • BSIE对FN-DMC具有约束力的能源计算的影响尚未得到充分证实.

研究的目的:

  • 在FN-DMC有约束力的能量计算中系统地调查BSIE.
  • 评估FN-DMC的不同基准集的性能.
  • 确定在FN-DMC中减轻BSIE的策略.

主要方法:

  • 使用了A24数据集的24个非共约束的二次数.
  • 使用各种基础集 (cc-pVDZ,cc-pVTZ,aug-cc-pVTZ) 进行了FN-DMC计算.
  • 评估了分散函数和对权衡修正对BSIE的影响.

主要成果:

  • 在FN-DMC的绑定能量计算中,BSIE可能很重要,特别是在像cc-pVDZ和cc-pVTZ这样的小基数组中.
  • 在 aug-cc-pVTZ 基础集提供了准确性和计算成本之间的良好平衡.
  • 增加带有分散函数的基础集和使用对权衡校正有效地降低了BSIE.

结论:

  • 在FN-DMC中最小BSIE的假设对于绑定能量并不普遍有效.
  • 增强基数组,扩散函数和对权衡校正对于准确的FN-DMC绑定能量的计算至关重要.
  • 现有策略可以减轻BSIE,允许使用更小的基准集,如 aug-cc-pVDZ.