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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

24.0K
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...
24.0K
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

3.9K
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...
3.9K

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相关实验视频

Updated: Jul 19, 2025

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
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Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

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用现代缩放算法纠正衍射数据中的系统错误.

Luis A Aldama1, Kevin M Dalton1, Doeke R Hekstra1

  • 1Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts, USA.

Acta crystallographica. Section D, Structural biology
|August 16, 2023
PubMed
概括
此摘要是机器生成的。

新的变量推理方法为扩展X射线衍射数据提供了传统最小平方优化的灵活替代方案,提高了复杂结构分析的准确性.

关键词:
在X射线晶体学.深度学习是一种深度学习.缩放,扩展和扩展变化推理推理是变化的推理.

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X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

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科学领域:

  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.
  • 数据分析 数据分析

背景情况:

  • 射线衍射对于确定材料原子结构至关重要.
  • 数据处理算法,特别是缩放,对于精确的电子密度确定至关重要.
  • 传统的缩放方法使用最小平方优化来纠正衍射强度的系统错误.

研究的目的:

  • 审查X射线衍射缩放算法的历史和演变.
  • 引入和对比变异推理作为数据缩放的新方法.
  • 为了确定用例,并为变化推理算法提供指导,Careless.

主要方法:

  • 复习经典最小平方缩放算法.
  • 介绍用于同时数据合并和错误纠正的变量推理.
  • 应用和评估的粗心的算法.

主要成果:

  • 变量推理为传统缩放方法提供了一个灵活且有利的替代方案.
  • 粗心的算法证明了在X射线衍射中变异推理的实际应用.
  • 已经确定了变异推理超越的特定使用情况.

结论:

  • 变异推理为X射线衍射数据缩放提供了一个强大的新范式.
  • 无忧的算法为研究人员提供了一个宝贵的工具,利用先进的X射线来源和实验.
  • 预计未来变量缩放方法的发展将进一步增强结构确定性.