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Related Concept Videos

Applications Of NMR In Biology01:25

Applications Of NMR In Biology

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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.
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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...
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Shape-changing magnetic assemblies as high-sensitivity NMR-readable nanoprobes.

G Zabow1, S J Dodd2, A P Koretsky2

  • 11] Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA [2] Electromagnetics Division, Physical Measurements Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305, USA.

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|March 18, 2015
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Summary
This summary is machine-generated.

Researchers developed novel radio-frequency sensors for deep tissue imaging, overcoming optical limitations. These nuclear magnetic resonance (NMR) sensors offer high sensitivity and biocompatibility for diverse biological research applications.

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Area of Science:

  • Biomedical Engineering
  • Molecular Biology
  • Nanotechnology

Background:

  • Fluorescent and plasmonic probes enable visualization of cellular processes but face limitations in deep tissue imaging due to light scattering and autofluorescence.
  • Near-infrared probes improve penetration but still suffer from reduced resolution and sensitivity with increasing depth.
  • Optical methods lack the ability to provide deep subsurface sensing in vivo.

Purpose of the Study:

  • To present a novel sensor design that operates in the radio-frequency spectrum, overcoming the depth limitations of optical probes.
  • To enable spatially resolved sensing deep within biological tissues using standard magnetic resonance imaging (MRI) equipment.
  • To develop broadly generalizable, MRI-compatible, radio-frequency analogues to optically based probes.

Main Methods:

  • Designed radio-frequency-addressable sensor assemblies composed of magnetic disks spaced by swellable hydrogel material.
  • Engineered sensors to reversibly reconfigure in response to stimuli, generating geometry-dependent, dynamic nuclear magnetic resonance (NMR) spectral signatures.
  • Utilized standard magnetic resonance imaging (MRI) equipment for spatial localization and detection of the sensors.

Main Results:

  • Demonstrated sensors that operate in the NMR radio-frequency spectrum, where signal attenuation and distortion are negligible.
  • Achieved sensors with biocompatible materials, detectable at low concentrations, and exhibiting responsive NMR spectral shifts significantly greater than traditional methods.
  • Showcased sensors that can be spatially located using standard MRI equipment, obviating the need for optical addressability.

Conclusions:

  • The developed radio-frequency sensors provide a non-optical, MRI-compatible platform for deep subsurface sensing in vivo.
  • These adaptable, shape-changing systems can measure various environmental and physiological indicators, offering a new class of probes for research.
  • The technology presents a broadly generalizable alternative to optical probes for chemical, biological, medical, and engineering research.