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Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes01:23

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...
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Atomic Nuclei: Magnetic Resonance01:05

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...
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...

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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Dynamic nuclear polarization at high magnetic fields.

Thorsten Maly1, Galia T Debelouchina, Vikram S Bajaj

  • 1Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

The Journal of Chemical Physics
|February 13, 2008
PubMed
Summary
This summary is machine-generated.

Dynamic nuclear polarization (DNP) significantly enhances NMR signal intensity for biological molecules. Recent advancements focus on high magnetic fields, improving instrumentation and applications in structural and mechanistic studies.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Biophysical Chemistry
  • Magnetic Resonance Imaging (MRI)

Background:

  • Dynamic Nuclear Polarization (DNP) is a technique to enhance Nuclear Magnetic Resonance (NMR) signal intensity.
  • The method involves transferring polarization from unpaired electrons to nuclei via microwave irradiation.
  • Historically, DNP research focused on low magnetic fields, but contemporary NMR operates at high fields.

Purpose of the Study:

  • This review focuses on recent developments in DNP.
  • Emphasis is placed on DNP applications and mechanisms at high magnetic fields (≥5 T).
  • The review aims to provide an overview of advancements in instrumentation and biological applications.

Main Methods:

  • Review of classical continuous wave (cw) DNP mechanisms: Overhauser effect, solid effect, cross effect, and thermal mixing.
  • Discussion of coherent polarization transfer mechanisms, potentially more efficient at high fields.
  • Examination of recent developments in microwave and probe technology for DNP implementation.

Main Results:

  • DNP offers significant signal enhancement for NMR studies of biologically relevant molecules.
  • High magnetic field DNP requires advanced instrumentation, including improved microwave and probe technology.
  • Recent developments have expanded DNP applications in both biological solids and liquids.

Conclusions:

  • DNP is a powerful tool for structural and mechanistic studies of biomolecules.
  • Advancements in high-field DNP and instrumentation are crucial for its broader application.
  • Future developments in DNP hold promise for further enhancing NMR capabilities in biological sciences.