Chemical shifts in biomolecules

H Chemical Shifts in NMR

Sensitivity Encoding of Chemical Shifts

INTRODUCTION The chemical shift artifact (CSA) results from temporally undersampling a spatial-spectral distribution along a tilted k-t trajectory. This is illustrated in Fig. 1 for the case of H imaging. Figure 1(a) shows a typical H spatial-spectral distribution, in which the two predominant spectral components are from lipid and water protons. Figure 1(b) shows the k-t space sampling pattern...

P NMR Chemical Shifts in Polyoxometalates

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Proton chemical shifts in NMR: Part 17.† Chemical shifts in alkenes and anisotropic and steric effects of the double bond

The 1H NMR spectra of a number of alkenes of known geometry were recorded in CDCl3 solution and assigned, namely ethylene, propene, 4-methylcyclohexene, 1,4-dimethylcyclohexene, methylene cyclohexane (in CFCl3 –CD2Cl2 at 153 K), 5-methylene-2-norbornene, camphene, bicyclopentadiene, styrene and 9-vinylanthracene. These results together with literature data for other alkenes, i.e. 1,3and 1,4-cyc...

Mapping the Chemical Universe of Biomolecules for Astrobiology

Understanding the origins of life is a central question of Astrobiology. Computer methods offer unique means to approach this challenge. There is strong evidence that biomolecules underwent a process of chemical evolution before life originated, and then a protracted period of biological evolution formed the universal genetic code shared by all extant terrestrial biology. The universal genetic ...