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We report the first implementation of the multiple-quantum magic-angle-spinning method to obtain high-resolution (39)K NMR spectra for bio-organic solids. The observed spectral resolution in the isotropic dimension is nearly at the sub-ppm level, which approaches the intrinsic resolution limit determined primarily by quadrupole relaxation. We show that high-resolution solid-state (39)K NMR spectroscopy can be used as a new means of probing K(+) ions in biomolecular systems.
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Wu et al. (2011) studied this question.
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