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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

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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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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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相关实验视频

Updated: Sep 19, 2025

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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通过结构特定的约束来对X射线结构进行量子化学方法的基准测试.

Birger Dittrich1, Rok Breznikar1, Gianluca Santarossa1

  • 1Novartis Campus, Novartis Pharma AG, Postfach, Basel CH-4002, Switzerland.

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|June 18, 2025
PubMed
概括
此摘要是机器生成的。

分子集群 (MIC) 计算提供了一种快速而准确的方法来优化不精确的晶体结构,这对于制药性质预测至关重要. 这些方法与全周期计算相匹配,有效地提高实验数据的质量.

关键词:
DFT 的基准分析.准确的结构特定的束装置.晶体结构的结晶结构.量子晶体学是一种量子晶体学.

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相关实验视频

Last Updated: Sep 19, 2025

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科学领域:

  • 固态化学 固态化学
  • 计算化学是一种计算化学.
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 制药研究需要精确的晶体结构优化来进行属性预测.
  • 实验性晶体结构往往需要增强到一个一致的质量水平.
  • 增加分子大小和复杂性需要高效的计算方法.

研究的目的:

  • 评估分子集群 (MIC) 计算的准确性和效率,以优化固态结构.
  • 为了将MIC计算与全周期 (FP) 计算进行比较,用于增强实验晶体结构.
  • 在MIC框架内评估不同量子力学方法和基础集的影响.

主要方法:

  • 在量子力学/分子力学 (QM:MM) 框架内利用分子集群 (MIC) 计算.
  • 评估了选择的量子力学方法,包括DFT-D和GFN2-xTB.
  • 采用了结晶最小正方形精细化,并计算了结构特定的约束,并比较了根平均正方形的笛卡尔位移.

主要成果:

  • 与MIC GFN2-xTB相比,MIC DFT-D QM:MM计算的限制和坐标得到了改进.
  • 在MIC QM:MM中增加量子力学基础集大小并没有持续地提高结果.
  • 选择DFT函数的准确性不如选择基数组的准确性那么重要.

结论:

  • MIC计算为固态结构优化的全周期计算提供了一个准确且计算效率高的替代方案.
  • MIC 方法适用于增强实验性晶体结构,特别是那些具有混乱或多个分子的晶体结构.
  • 这种方法有助于制药研究中进行高质量的比较研究和属性预测.