magnetic resonance spectroscopy


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Related to magnetic resonance spectroscopy: Nuclear magnetic resonance spectroscopy

mag·net·ic res·o·nance spec·tros·co·py

detection and measurement of the resonant spectra of molecular species in a tissue or sample.

magnetic resonance spectroscopy

A magnetic resonance technique in which a sample is placed in a strong  homogeneous magnetic field and stimulated with radio frequency electromagnetic energy. If the field is uniform throughout the sample, similar nuclei will contribute a particular frequency component to the detected response signal, irrespective of their position in the sample. Because nuclei of different elements resonate at different frequencies, a chemical can be analysed by parsing the MR response signal into its frequency components.

magnetic resonance spectroscopy

An advanced method of chemical analysis using a technique similar to that employed in nuclear magnetic resonance imaging. The method is based on the fact that the electrons in a molecule shield the nucleus to some extent from the strong applied external field, causing different atoms to absorb at slightly different frequencies. It is applicable to molecules in the living body or in other organisms. The method has, for instance, been used to prove that the structure of the protein capsid surrounding the genome of HIV consists of seven alpha helices, two beta-hairpins and a single exposed loop.
References in periodicals archive ?
Use of high-resolution proton nuclear magnetic resonance spectroscopy for rapid multi-component analysis of urine.
In contrast, the magnetic resonance spectroscopy revealed a significant decrease in the metabolite ratio of N-acetylaspartate to creatinine following the surgery, which indicated a disturbance in neuronal cell metabolism.
Most of these techniques--harmonic magnetic resonance elastography, optical mammography and magnetic resonance spectroscopy, to name a few--have encouraging early results, but have only been tested in handfuls of patients, according to developers of the technologies.
Instead of examining muscle composition by surgically removing tiny bits of muscle tissue, Park and her co-workers placed the subjects' arms in the bore of a superconducting magnet and used magnetic resonance spectroscopy to monitor how the phosphorus in various muscle metabolites reacted to the magnet.
They underwent a specialized magnetic resonance spectroscopy brain scan, an imaging technique that allows measurement of the amount of GABA in small regions of the brain.
Brain scans using proton magnetic resonance spectroscopy showed an increased ratio of choline to creatine in the basal ganglia and white matter in the HCV-infected patients-findings that were reported previously by these investigators (Hepatology 35[2]:433-39, 2002).
Magnetic resonance spectroscopy (MRS), which measures brain chemicals, detected diminished levels of N-acetyl-aspartate (NAA) in the left and right basal ganglia of veterans with any of three identified Gulf War syndromes.
They then made up a solution of these four sugars and used nuclear magnetic resonance spectroscopy and a calorimeter to analyze its properties as it cooled.
To overcome these shortcomings, Antonio Randazzo and Anders Malmendal's team turned to nuclear magnetic resonance spectroscopy (NMR) to test its abilities as "a magnetic tongue.
In the last few years, advances in nuclear magnetic resonance spectroscopy have allowed medical researchers to gather much information about the molecular chemistry that takes place inside living cells (SN: 10/15/83, p.
The team used magnetic resonance spectroscopy to directly measure GABA levels in the brain both before and after a low-level current was delivered through research participants' scalps.

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