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相关概念视频

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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使用冷EM运动校正算法进行NMR光谱对齐.

Colin A Hemme1,2, Owen A Warmuth1, Songlin Wang1

  • 1Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Dr, Madison, Wisconsin 53706, United States.

Analytical chemistry
|December 15, 2025
PubMed
概括
此摘要是机器生成的。

自动NMR光谱对齐 (ANSA) 软件使用基于图像的交叉相关性对齐固态NMR光谱. 这种方法克服了手动对齐的局限性,提高了数据的严谨性,并使复杂实验的自动处理成为可能.

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科学领域:

  • 生物物理学的生物物理.
  • 分析化学 分析化学
  • 结构生物学 结构生物学

背景情况:

  • 魔力角旋转 (MAS) 固态NMR (SSNMR) 提供了高分辨率,但面临着光谱对齐挑战.
  • 现有的方法缺乏自动化,是主观的,阻碍了对像大型蛋白质这样复杂数据集的分析.
  • 场梯度,温度变化和脉冲序列效应导致SSNMR数据中的引用错误.

研究的目的:

  • 为SSNMR数据开发一种自动化的光谱对齐方法.
  • 为了解决手动,主观峰值检查的局限性,用于光谱引用.
  • 提高SSNMR数据处理的准确性和可重复性.

主要方法:

  • 开发了自动化NMR光谱对齐 (ANSA) 软件.开发了自动化NMR光谱对齐 (ANSA) 软件.
  • 根据NMR光谱的冷电子显微镜运动校正的调整原则.
  • 利用交叉相关函数来处理NMR光谱作为对齐图像.

主要成果:

  • 在受控试验中,ANSA的交叉相关性得分从0.33提高到1.00.
  • 在现实应用中与以前不对齐的光谱实现了0.96的相关性.
  • 在各种实验条件中成功调整了光谱,并在长期实验中纠正了变化.

结论:

  • ANSA提供客观和一致的光谱对齐,增强科学严谨性.
  • 该软件提高了可重现性,并使关键的NMR数据处理步骤的自动化成为可能.
  • 作为一个开源工具,ANSA可用于集成到现有的NMR工作流中.