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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

25.8K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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相关实验视频

Updated: Jan 18, 2026

Microcrystallography of Protein Crystals and In Cellulo Diffraction
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Microcrystallography of Protein Crystals and In Cellulo Diffraction

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晶体结构精炼的基准测试:关于希尔什菲尔德原子精炼的系统研究.

Daniel Brüx1, Florian Meurer2, Florian Kleemiss1

  • 1RWTH Aachen University, Institut für Anorganische Chemie, Landoltweg 1a, 52074 Aachen, Germany.

Structural dynamics (Melville, N.Y.)
|September 12, 2025
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概括
此摘要是机器生成的。

这项研究澄清了希尔什菲尔德原子精炼 (HAR) 的波函数计算参数. 纯粹的哈特里-福克方法显示出比极性有机分子的密度函数理论更高的性能.

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Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
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Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures

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Workflow and Tools for Crystallographic Fragment Screening at the Helmholtz-Zentrum Berlin
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相关实验视频

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Microcrystallography of Protein Crystals and In Cellulo Diffraction
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Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
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Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures

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Workflow and Tools for Crystallographic Fragment Screening at the Helmholtz-Zentrum Berlin
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Workflow and Tools for Crystallographic Fragment Screening at the Helmholtz-Zentrum Berlin

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科学领域:

  • 晶体学 晶体学是指结晶学.
  • 计算化学计算化学
  • 量子化学 是一个量子化学.

背景情况:

  • 希尔什菲尔德原子精炼 (HAR) 对于精确的晶体结构分析至关重要.
  • 关于HAR的最佳波函数计算参数存在相互矛盾的建议.
  • 由于实验数据的高质量,氨基酸结构提供了可靠的基准.

研究的目的:

  • 系统地研究波函数计算参数对HAR的影响.
  • 解决有关推的HAR程序的文献中的差异.
  • 为HAR提供有关选择适当计算方法的指导.

主要方法:

  • 采用了完整的精炼参数变换 (2496次每氨基酸的精炼).
  • 使用高质量的氨基酸晶体结构作为测试案例.
  • 用溶剂模型和各种量子化学方法比较气相计算.

主要成果:

  • 与气相计算相比,溶剂模型始终改善了HAR结果.
  • 纯粹的哈特里-福克方法超过了所有测试的密度函数理论 (DFT) 方法.
  • 在各种测试参数和结构中观察到性能差异.

结论:

  • 仔细选择理论水平对于成功的HAR至关重要.
  • 对于HAR中极性有机分子,建议使用纯粹的Hartree-Fock方法,而不是经过测试的DFT方法.
  • 这项研究提供了一个清晰的方法和参数性能概述在HAR.