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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Nuclear Magnetic Resonance (NMR): Overview01:07

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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...
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Atomic Nuclei: Magnetic Resonance01:05

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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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Applications Of NMR In Biology01:25

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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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NMR Spectrometers: Overview01:20

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Magnetic resonance spectroscopy.

Christopher J Rhodes

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    Summary
    This summary is machine-generated.

    Magnetic resonance techniques like nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR), and muon spin resonance (μSR) offer deep insights into molecular structures and dynamics. These methods are crucial for advancements in chemistry, materials science, and biomedical research.

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    Area of Science:

    • Chemistry
    • Materials Science
    • Biomedical Science

    Background:

    • Magnetic fields influence spectral lines, a phenomenon leading to the development of magnetic resonance techniques.
    • Magnetic resonance encompasses a range of methods providing critical insights into molecular properties.

    Purpose of the Study:

    • To review key magnetic resonance techniques: nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR), and muon spin resonance (μSR).
    • To highlight the applications and contributions of these methods to various scientific disciplines.
    • To describe complementary techniques such as magnetic resonance imaging (MRI) and in vivo spectroscopy.

    Main Methods:

    • Nuclear Magnetic Resonance (NMR)
    • Electron Paramagnetic Resonance (EPR), including pulsed techniques for free radical investigation.
    • Muon Spin Resonance (μSR)

    Main Results:

    • Magnetic resonance methods provide unparalleled insight into molecular structures, reactivity, and dynamics.
    • These techniques have significantly advanced the understanding of chemistry, materials science, and biomedical applications.
    • EPR is a principal method for studying free radicals, with emerging biomedical uses.

    Conclusions:

    • NMR, EPR, and μSR are powerful tools for molecular investigation.
    • The complementarity of these magnetic resonance methods enhances their utility across scientific fields.
    • Continued innovation in magnetic resonance techniques promises further breakthroughs in science and medicine.