13C nuclear magnetic relaxation studies at 62 MHz

Nuclear Magnetic Relaxation

Studies of Biomolecules and Their Complexes by Nuclear Magnetic Relaxation

Conformational studies on tocinamide and deaminotocinamide by 220 MHz nuclear magnetic resonance spectroscopy.

The 220 MHz spectra of tocinamide and deaminotocinamide, the ring moieties of oxytocin and of deamino-oxytocin, respectively, were investigated in [U-(2)H]dimethylsulfoxide solution. Extensive decoupling and exchange experiments allow complete spectral assignment and determination of many coupling constants. Circular dichroism spectra assigned a right-hand screw sense to the C-S-S-C group. The ...

Natural abundance 13C nuclear magnetic resonance studies of human plasma high density lipoproteins.

High resolution proton-decoupled natural abundance ‘:‘C NMR spectra (at 15.18 MHz) of human plasma high density lipoproteins were recorded at 29”C, Yfi”C, and 43°C. Carbon 5 of unesterified cholesterol and the corresponding carbon of cholesteryl esters yield narrow, well resolved resonances. Values of nuclear Overhauser enhancements and integrated intensities for C-5 of free and esterified chol...

A comparison of 13C nuclear magnetic resonance and 14C tracer studies of hepatic metabolism.

The gluconeogenic pathway from 13C-labeled substrates, each of which contained the 14C-labeled counterpart at a tracer level, has been followed in isolated rat liver cells and in isolated perfused mouse liver. The gluconeogenic flux from glycerol, the synthesis of glycogen, the stimulation of glycogenolysis by glucagon, the recycling of triacylglycerol, and an increase in pentose cycle activity...