Nuclear magnetic resonance dependence

P.T. Callaghan and D.N. Pinder, "Self-Diffusion of Random-Coil Polystyrene Determined by Pulsed Field Gradient Nuclear Magnetic Resonance Dependence on Concentration and Molar Mass,"... 

P. T. Callaghan andD. N. Finder. Self-diffusion ofrandom-coil polystyrene determined by pulsed field gradient nuclear magnetic resonance Dependence on concentration and molar mass. Macromolecules, 14 (1981), 1334-1340. 

Gutowsky H S and Holm C H 1975 Time-dependent magnetic perturbations Dynamic Nuclear Magnetic Resonance Spectroscopy ed L M Jackman and F A Cotton (New York Academic) pp 1-21... 

Physical Chemical Characterization. Thiamine, its derivatives, and its degradation products have been fully characterized by spectroscopic methods (9,10). The ultraviolet spectmm of thiamine shows pH-dependent maxima (11). H, and nuclear magnetic resonance spectra show protonation occurs at the 1-nitrogen, and not the 4-amino position (12—14). The H spectmm in D2O shows no resonance for the thiazole 2-hydrogen, as this is acidic and readily exchanged via formation of the thiazole yUd (13) an important intermediate in the biochemical functions of thiamine. Recent work has revised the piC values for the two ionization reactions to 4.8 and 18 respectively (9,10,15). The mass spectmm of thiamine hydrochloride shows no molecular ion under standard electron impact ionization conditions, but fast atom bombardment and chemical ionization allow observation of both an intense peak for the patent cation and its major fragmentation ion, the pyrimidinylmethyl cation (16). 

In the previous section was given the experimental demonstration of two sites. Here the steady state scheme and equations necessary to calculate the single channel currents are given. The elemental rate constants are thereby defined and related to experimentally determinable rate constants. Eyring rate theory is then used to introduce the voltage dependence to these rate constants. Having identified the experimentally required quantities, these are then derived from nuclear magnetic resonance and dielectric relaxation studies on channel incorporated into lipid bilayers. 

Isab, A.A. and Sadler, P.J. (1981) Hydrogen-1 and carbon-13 nuclear magnetic resonance studies of gold(I) thiomalate (Myocrisin) in aqueous solution. Dependence of the solution structure on pH and ionic strength. Journal of the Chemical Society, Dalton Transactions, (7), 1657-1663. 

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