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相关概念视频

2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

125
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...
125
Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

600
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
600
2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

848
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
848
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

588
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...
588
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

115
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...
115
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

937
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...
937

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Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
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对定量NOESYY的不统一采样

William T P Darling1,2, Sven G Hyberts3, Mate Erdelyi1,2

  • 1Department of Chemistry - BMC, Uppsala University, Uppsala, Sweden.

Magnetic resonance in chemistry : MRC
|May 16, 2025
PubMed
概括
此摘要是机器生成的。

优化的Poisson-gap采样方案提高了用于定量分析的核磁共振 (NMR) 光谱准确度. 结合均和非均采样 (NUS) 的混合方案提供了更高的质子间距离精度,增强了NOESY实验.

关键词:
诺西 (NOESY) 的意思是这就是NUS NUS.不统一的抽样方式这是一个定量NOE NOE.

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科学领域:

  • 核磁共振 (NMR) 谱学是指核磁共振的光谱学.
  • 定量分析是一种量化分析.
  • 生物物理化学 生物物理化学

背景情况:

  • 不统一的采样 (NUS) 加快了NMR数据的获取,但引起了人们对光谱真实性的担忧,特别是在高动态范围的实验中,如NOESY.
  • 由于光谱精度的潜在妥协,NUS的数量应用有限.

研究的目的:

  • 评估优化的Poisson-gap采样方案,用于适合量化的高保真性NMR光谱.
  • 评估NUS排名工具 (NUSscore和nus-tool) 在确定最佳采样策略方面的有效性.
  • 调查混合统一/非统一抽样 (US-NUS) 方案的性能.

主要方法:

  • 使用NUSscore生成并对25,000个Poisson-gap采样方案进行了排名.
  • 对比选定的Poisson-gap计划,随机混合计划和美国-NUS混合方案,采样覆盖率为50%.
  • 根据对均采样参考光谱的质子间距离精度进行评估的光谱保真度.

主要成果:

  • NUSscore与光谱保真度有很强的相关性.
  • 池间隔计划的表现优于随机混计划.
  • 与传统的Poisson-gap方案相比,美国-NUS混合方案显示出优越的质子间距离保护.
  • 像nus-tool这样的NUS排名工具 (峰值与侧叶比,相对灵敏度) 与光谱忠实度的相关性有限.

结论:

  • 优化Poisson-gap采样,特别是美国-NUS混合体,可以实现定量NMR的高光谱保真度.
  • NUSscore是选择有效采样方案的可靠指标.
  • 美国-NUS混合方案为量化NOESY分析提供了有希望的方法,减少了种子依赖.