nuclear magnetic resonance

nuclear magnetic resonance
nuclear magnetic resonance u"cle*ar mag*net"ic res"on*ance n. (Physics) The specific absorption and re-emission of electromagnetic radiation at characteristic wavelengths by atomic nuclei in a magnetic field. It is abbreviated {NMR}. The wavelength of the radiation absorbed depends on the type of nucleus, the intensity of the magnetic field, and the local chemical environment in which the nucleus resides. It is the latter effect (called the chemical shift), by which atoms of specific elements in different chemical compounds show a different resonance frequency, which gives rise to the greatest utility of this phenomenon in analyzing the chemical structure of substances. Similar effects of the chemical environment permit the discrimination of different types of living tissue by virtue of their different chemical composition, thus permitting utilization of the phenomenon in medical diagnostic instruments, especially for {magnetic resonance imaging}. [PJC]

The Collaborative International Dictionary of English. 2000.

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  • nuclear magnetic resonance — n. a phenomenon exhibited by various atomic nuclei when placed in a strong magnetic field, in which they absorb energy from specific, high frequency radio waves: the measurements of the magnetic moments of these nuclei, esp. of hydrogen, are used …   English World dictionary

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  • Nuclear Magnetic Resonance — Ein 300 MHz NMR Spektrometer Die Kern(spin)resonanzspektroskopie (NMR Spektroskopie von engl. nuclear magnetic resonance) ist eine spektroskopische Methode, welche die Untersuchung der elektronischen Umgebung einzelner Atome und der… …   Deutsch Wikipedia

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  • Nuclear magnetic resonance spectroscopy of proteins — (usually abbreviated protein NMR) is a field of structural biology in which NMR spectroscopy is used to obtain information about the structure and dynamics of proteins. The field was pioneered by Richard R. Ernst and Kurt Wüthrich[1], among… …   Wikipedia

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