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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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NMR Spectrometers: Resolution and Error Correction01:14

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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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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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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Correction: Sparse sampling methods in multidimensional NMR.

Mehdi Mobli1, Mark W Maciejewski, Adam D Schuyler

  • 1Division of Chemistry & Structural Biology, Institute for Molecular Bioscience, The University of Queensland, St. Lucia 4072, Brisbane, Australia.

Physical Chemistry Chemical Physics : PCCP
|July 2, 2016
PubMed
Summary
This summary is machine-generated.

This correction clarifies sparse sampling methods in multidimensional nuclear magnetic resonance (NMR) spectroscopy. It ensures accurate understanding and application of these advanced NMR techniques.

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Area of Science:

  • Biophysical Chemistry
  • Magnetic Resonance Spectroscopy
  • Computational Chemistry

Background:

  • Multidimensional NMR spectroscopy is crucial for molecular structure determination.
  • Sparse sampling techniques accelerate data acquisition in NMR experiments.
  • Accurate implementation of these methods is vital for reliable results.

Purpose of the Study:

  • To correct errors in a previous publication on sparse sampling in multidimensional NMR.
  • To provide a precise description of the methodologies discussed.
  • To ensure the integrity and reproducibility of NMR data analysis.

Main Methods:

  • Review and re-evaluation of the algorithms presented in the original work.
  • Detailed explanation of the corrected mathematical formulations.
  • Clarification of computational procedures for sparse sampling.

Main Results:

  • Identification and rectification of specific inaccuracies in the original manuscript.
  • Confirmation of the underlying principles of sparse sampling.
  • Improved understanding of the practical application of these methods.

Conclusions:

  • The corrected information enhances the utility of sparse sampling in multidimensional NMR.
  • Accurate methods are essential for advancing structural biology and chemical physics.
  • This correction ensures researchers can confidently apply these advanced NMR techniques.