Showing papers in "Journal of Magnetic Resonance in 1982"

TL;DR: In this article, a method for obtaining pure absorption phase spectra in four quadrants in a two-dimensional nuclear magnetic resonance spin exchange experiment is described, which results in a substantial increase in resolution and discrimination while maintaining a signal-to-noise ratio comparable to that of the usual magnitude spectrum.

TL;DR: The solid-state cross polarization and magic-angle spinning analog of an earlier 2D FT experiment on liquids is introduced in this article, which permits the observation of spin exchange processes.

TL;DR: The TRNOE method is applicable even when no individual proton resonances of either the protein or the bound ligand can be resolved, and is not limited by the molecular weight of the protein, extending the molecular Weight range over which ‘H NMR can provide useful conformational information to the very largest systems.

TL;DR: In this paper, a formalism for extracting information about molecular motion from T 1 values measured for static and spinning polycrystalline solids is presented, which can readily distinguish between three-site jump and continuous diffusion models of methyl reorientation on the basis of the different angular dependence calculated for T 1 in these two models.

TL;DR: In this article, a pulse sequence and sample geometry which allows the measurement of 13 C chemical shifts of solid materials relative to liquid tetramethylsilane (TMS) is described.

TL;DR: In this paper, it is shown that it is possible to construct sequences of small numbers of pulses which rotate the magnetization vector in a manner analogous to a single pulse, but which have the advantage of being less sensitive to deviations in the radiofrequency field strength.

TL;DR: In particular, the 79Br signal from powdered KBr is especially convenient for monitoring the angle in 13C MAS experiments as discussed by the authors, and large crystals of KBr offer greater sensitivity to angle but are less convenient to use than powder.

TL;DR: Preliminary studies of a variety of murine tumors indicate that the 31P NMR spectrum is a sensitive monitor of progressive metabolic changes that occur during untreated tumor growth and an early indicator of tumor response to chemotherapy, hyperthermia, and X radiation.

TL;DR: In this paper, a method for the separation of coherent and incoherent magnetization transfer in two-dimensional NOE and chemical exchange spectroscopy is described, where the mixing time τ m is incremented systematically together with the evolution time t 1.

TL;DR: In this paper, the NMR spectrum of a spin S coupled to another spin I which is undergoing an arbitrary time-dependent irradiation is analyzed, and the efficacies of various schemes for spin decoupling are compared using the average Hamiltonian method.

TL;DR: In this paper, a two-dimensional chemical shift correlation spectroscopy (CSCSCS) was used to relay the spectral information about the remote nuclei through a neighbor to the heteronucleus, which is referred to as relayed coherence transfer.

TL;DR: In this article, high-resolution 31P solid-state NMR spectra of triphenylphosphine copper(I) complexes, obtained by combining proton dipolar decoupling, proton-phosphorus cross polarization and magic-angle sample spinning, often reveal asymmetric quartets rather than single resonance lines.

TL;DR: A five-pulse sequence for population inversion of all resonances in a spectrum whose width may be nearly twice as large as the radiofrequency field strength was proposed in this article.

TL;DR: The dependence of second harmonic, 90°-out-of-phase, absorption saturation transfer ESR spectra on sample size and position in the microwave cavity was investigated for aqueous samples in capillaries within a quartz Dewar, in the rectangular TE 102 cavity as discussed by the authors.

TL;DR: The selective rate was found to be particularly sensitive to the presence of the enzyme, and from the nonselective/selective ratio, the correlation times of the free and bound substrate were evaluated.

TL;DR: In this paper, it is shown that a conventional two-site magnetization transfer experiment provides insufficient amount of information to allow a reliable determination of the exchange rate, unless |λ2| ⪢ |λ1|, where λ1 and λ2 are the time constants of the two exponentials involved.