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Atomic Nuclei: Magnetic Resonance

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...

Nuclear Magnetic Resonance (NMR): Overview

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

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. This...

Double Resonance Techniques: Overview

Double Resonance Techniques: Overview

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...

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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...

Applications Of NMR In Biology

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
The...

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Related Experiment Video

Updated: Jun 8, 2026

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

Published on: October 9, 2020

Nuclear magnetic resonance captures the elusive.

Steven R Van Doren¹

¹Department of Biochemistry 105 Schweitzer Hall, University of Missouri, Columbia, MO 65211 USA. vandorens@missouri.edu

F1000 Biology Reports

|October 16, 2010

Summary

Innovative nuclear magnetic resonance (NMR) methods reveal hidden properties of biomolecular assemblies. These techniques overcome challenges in detecting dynamic equilibria and complex structures, advancing molecular biology research.

Area of Science:

Biophysics
Structural Biology
Biochemistry

Background:

Biomolecular assemblies possess functionally important properties that are difficult to detect using conventional methods.
Challenges include studying dynamic equilibria with low-population excited states and the structures of complexes with slow molecular tumbling in solution.

Purpose of the Study:

To highlight innovative nuclear magnetic resonance (NMR) approaches for investigating elusive biomolecular properties.
To demonstrate the utility of NMR in overcoming limitations in detecting dynamic equilibria and complex structures.

Main Methods:

Advanced nuclear magnetic resonance (NMR) techniques.
Analysis of dynamic equilibria in biomolecular systems.
Structural elucidation of macromolecular complexes.

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Pure Shift Nuclear Magnetic Resonance: a New Tool for Plant Metabolomics

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Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance

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Last Updated: Jun 8, 2026

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

Published on: October 9, 2020

Pure Shift Nuclear Magnetic Resonance: a New Tool for Plant Metabolomics

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Published on: July 31, 2021

Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance

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Main Results:

Successful detection of functionally important properties in biomolecular assemblies that were previously undetectable.
Characterization of dynamic equilibria involving low-population excited states.
Determination of structures for complexes exhibiting slow tumbling in solution.

Conclusions:

Innovative NMR approaches provide powerful tools for uncovering hidden aspects of biomolecular assemblies.
These methods enhance our understanding of molecular dynamics and structural biology.
The findings open new avenues for studying complex biological systems.