Complete resonance assignment of a natural abundance solid peptide by through-bond heteronuclear correlation solid-state NMR
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In high-resoln. NMR, a network of scalar-coupled spins can be broken down into fragments which encode information about the chem. shifts and couplings that are relevant to a cross-peak multiplet in a two-dimensional correlation ("COSY") expt. Novel selec ...
Computer-supported anal. of two-dimensional correlation spectra encounters a no. of obstacles which are due, in the simplest case, to insufficient digital resoln., and, in more severe cases, to fundamental ambiguities in multiplet patterns. Various strateg ...
Multiplets that arise from scalar couplings in one- and two-dimensional NMR spectra can be considered as if they resulted from several successive convolutions with in-phase and antiphase doublets of d functions with splittings that correspond to scalar cou ...
For xenon atoms adsorbed in Na-A zeolite, electronic interactions cause shifts in NMR frequencies, resulting in a spectrum with discrete peaks from xenon atoms in cages with different xenon occupancies. Using two-dimensional exchange NMR, it is possible to ...
New NMR techniques are described for transferring transverse magnetization between scalar-coupled nuclei in the rotating frame. The methods involve simultaneous spin-locking of two selected spins A and X, using cosinusoidal modulation of the radio frequenc ...
Chem. shifts and scalar coupling consts. were extd. by symmetry mapping of multiplets in 2-dimensional NMR spectra. The procedure relies on the fact that, in addn. to symmetry with respect to the centers of the multiplets, substructures embedded within the ...
The use is described of pattern recognition techniques to analyze folded (in w1) 2-dimensional NMR spectra obtained by using the COSY (correlation spectroscopy) technique. A pattern recognition procedure (P. and B., 1986) relying on the comparison of patte ...
In order to sep. overlapping diagonal multiplets in two- or three-dimensional NMR spectra, new sequences using selective pulses are described which allow one to "inject" magnetization at the beginning of the evolution period by transfer from a selected cou ...
Procedures are described for automated anal. of two-dimensional NMR spectra correlating the chem. shifts of carbon-13 with the shifts of neighbor protons that are directly attached to the carbon-13 nuclei and with remote protons that have scalar couplings ...
An anal. was made of the effects of nonexponential transverse relaxation during the free precession periods of 2-dimensional NMR expts. The presence of cross-correlation between various interactions that cause relaxation, such as chem. shift anisotropy and ...
