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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

23.9K
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...
23.9K
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
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

184
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
184
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

202
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
202
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

721
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
721

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相关实验视频

Updated: Jul 8, 2025

X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects
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在单粒子X射线散射中使用高阶空间相关性来确定结构.

Wenyang Zhao1, Osamu Miyashita1, Miki Nakano1

  • 1Computational Structural Biology Research Team, RIKEN Center for Computational Science, 6-7-1 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.

IUCrJ
|December 14, 2023
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概括

这项研究引入了一种新的基于相关性的方法,用于使用X射线自由电子激光 (XFEL) 单粒子成像进行3D结构确定. 这项技术在没有事先知识的情况下,从噪音衍射数据中重建复杂的样本形状,从而推进了纳米尺度成像.

关键词:
3D重建的3D重建在X射线自由电子激光器.噪音探测器的噪音探测器衍射模式的衍射模式.单粒子X射线散射是一种散射.一个粒子成像技术空间相关性与空间相关性.结构的确定 结构的确定

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科学领域:

  • 结构生物学是结构生物学.
  • 生物物理学的生物物理.
  • 在X射线成像中使用X射线成像.

背景情况:

  • 使用X射线自由电子激光器 (XFELs) 进行单颗粒成像,可以在近乎生理条件下的纳米生物样本观察.
  • 重建3D样本密度需要先进的算法来确定在衍射模式中的未知样本方向.

研究的目的:

  • 开发一种新的ab initio方法,用于使用射模式的相关性分析来确定3D结构.
  • 在没有事先信息的情况下重建不规则,不对称的样本的3D结构.

主要方法:

  • 在衍射模式中分析双,三,四倍的空间相关性.
  • 调查和纠正背景和噪声对相关性分析的影响.
  • 处理不完整的衍射模式的演示.

主要成果:

  • 从模拟的XFEL数据成功地进行了不规则样本的初始3D结构重建.
  • 校正策略有效地减轻噪音和背景对基于相关性的重建的影响.
  • 该方法在不完整的衍射数据集上证明了可行性.

结论:

  • 拟议的基于相关性的方法为XFEL单粒子成像中的3D重建提供了强大的方法.
  • 这种技术提高了噪音和不完整的实验数据的处理.
  • 它是对现有算法的宝贵补充,促进了XFEL成像采用.