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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

3.8K
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...
3.8K

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相关实验视频

Updated: Jul 18, 2025

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

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分析时间解析的X射线数据的实用考虑.

Marius Schmidt1

  • 1Physics Department, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA.

Structural dynamics (Melville, N.Y.)
|August 21, 2023
PubMed
概括

使用X射线自由电子激光器 (XFEL) 和同步电子的时间分辨率晶体学依赖于差异电子密度 (DED) 地图. 本研究介绍了一种用于计算DED地图以确定结构模型的实用方法.

科学领域:

  • 结构生物学 结构生物学
  • 生物物理学的生物物理.
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 时间分辨率的宏分子晶体学随着硬X射线自由电子激光器 (XFEL) 的出现而进步.
  • 为XFELs开发的数据收集和处理技术现在应用于同步光源.
  • 尽管有不同的方法,但X射线数据分析遵循一个共同的路径.

研究的目的:

  • 介绍一个计算差电子密度 (DED) 图的实用方法.
  • 展示DED地图用于确定时间分辨率晶体学中的结构模型的使用.

主要方法:

  • 从时间解析的X射线衍射数据计算差异电子密度 (DED) 地图.
  • 使用DED地图来导出和完善宏分子的结构模型.

主要成果:

  • 详细介绍了一种用于生成具有化学意义的DED地图的强大方法.
  • 提出的方法可以从实验数据中确定结构模型.

结论:

  • 成功的时间分辨率晶体学取决于获得信息丰富的DED地图.
  • 这种实用方法促进了分析时间解析的X射线数据以进行结构性确定.

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Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography

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