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関連する概念動画

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

274
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
274
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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...
1.1K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

820
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
820
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

893
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
893
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

469
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
469
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

765
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...
765

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Updated: Aug 29, 2025

Quantifying Mixing using Magnetic Resonance Imaging
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最適な制御ベースの横断混合配列による感度強化多次元固体NMRスペクトル

Jan Blahut1,2, Matthias J Brandl3, Tejaswini Pradhan3

  • 1Department of Chemistry, Faculty of Science, Charles University, Albertov 6, 12842 Prague, Czech Republic.

Journal of the American Chemical Society
|September 8, 2022
PubMed
まとめ
この要約は機械生成です。

陽子検出の固体MRI実験は,新しい横断混合配列を使用して強化されました. これによって信号とノイズ比が向上し,以前は検出できなかったタンパク質の構造を特徴づけることができました.

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Pure Shift Nuclear Magnetic Resonance: a New Tool for Plant Metabolomics
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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科学分野:

  • 生物物理化学
  • 構造生物学
  • スペクトロスコーピー

背景:

  • 陽子検出のマジック・アングル・スピニング (MAS) 固体NMRスペクトロスコピーは,不溶性タンパク質の構造と動態の研究に不可欠です.
  • 既存の多次元MRI実験は,横断磁気化コンポーネントを同時に転送することで改善できます.
  • 溶液NMRにおける等価経路 (PEP) の保存は,より大きな分子におけるリラックスによる制限に直面する.

研究 の 目的:

  • 固体NMRにおける相関実験のための新しい異核横断混合配列を開発し,実装する.
  • 陽子検出の多次元NMR実験における信号対ノイズ比 (SNR) を強化する.
  • マイナー・フィブリル・ポリモルフなどの難解なタンパク質の原子解像度の特徴づけを可能にする.

主な方法:

  • 適度なおよび速いMAS周波数のための最適制御理論を使用して最適化された異核横断混合シーケンスの開発.
  • 炭素検出,感度強化の2DNCA実験の実施
  • 陽子検出,倍感強化の3D hCANHパルス配列の設計と応用.

主要な成果:

  • 最適な制御により,理論的な期待を超えて信号対ノイズ比 (SNR) が著しく向上しました.
  • 新しい3D hCANHパルス配列では,従来の方法と比較してSNRが3倍改善された.
  • 増強された感度により,ヒトのラムダIII免疫グロブリン軽鎖タンパク質のマイナーなフィブリルポリモルフの明瞭な特徴が認められた.

結論:

  • 開発された横断混合配列は,陽子検出の固体NMRに対する実質的な感度向上を提供します.
  • これらの高度なNMR技術は,複雑な生物学的システムを研究する際の感受性の限界を克服するために不可欠です.
  • この研究は,これまでに検出されなかったタンパク質の繊維ポリモルフを成功裏に特徴付け,強化された固体NMRの力を強調した.