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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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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...
977
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.1K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Related Experiment Video

Updated: Dec 17, 2025

Practical Aspects of Sample Preparation and Setup of 1H R1&#961; Relaxation Dispersion Experiments of RNA
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Recent advances in solid-state relaxation dispersion techniques.

Petra Rovó1

  • 1Department of Chemistry, Ludwig Maximilian University Munich, Butenandtstr. 5-13, 81377, Munich, Germany; Center for NanoScience (CeNS), Schellingstr. 4, 80799, Munich, Germany.

Solid State Nuclear Magnetic Resonance
|June 24, 2020
PubMed
Summary
This summary is machine-generated.

This review details two solid-state NMR methods for studying microsecond protein motion. These techniques, Bloch-McConnell Relaxation Dispersion and Near-rotary Resonance Relaxation Dispersion, analyze conformational fluctuations and exchange.

Keywords:
Bloch-McConnell relaxation dispersionFast MASMicrosecond motionNear-rotary resonance relaxation dispersionProtein dynamicsRedfield relaxationRelaxation dispersion

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Biophysics
  • Materials Science

Background:

  • Microsecond time-scale conformational fluctuations are crucial for biomolecular function and disease.
  • Studying these dynamics in the solid state is challenging but essential for a complete understanding.
  • Traditional methods often struggle to access high-energy, sparsely populated conformational states.

Purpose of the Study:

  • To review two key rotating-frame relaxation dispersion (R1ρ) methods for solid-state NMR.
  • To provide practical guidance for R1ρ measurements and analysis of conformational exchange.
  • To highlight recent advances in solid-state NMR for characterizing protein dynamics.

Main Methods:

  • Bloch-McConnell Relaxation Dispersion (R1ρ)
  • Near-rotary Resonance Relaxation Dispersion (R1ρ)
  • Fast Magic-Angle Spinning (MAS) NMR spectroscopy

Main Results:

  • R1ρ methods enable the study of microsecond conformational dynamics in solid-state molecules.
  • Fast MAS NMR allows observation and atomic-level characterization of transient conformational states.
  • These methods are applicable to proteins, lipids, nucleic acids, pharmaceuticals, and metal-organic frameworks.

Conclusions:

  • Solid-state NMR R1ρ relaxation dispersion is a powerful tool for investigating microsecond dynamics.
  • Advances in fast MAS NMR open new avenues for studying functionally relevant, high-energy states.
  • Understanding these dynamics is key to elucidating protein function, binding, catalysis, and disease mechanisms.