Phytochemical examination of corncob extracts led to the isolation of a new lignan identified as 7,7'-dihydroxy-3'-O-demethyl-4-methoxymatairesinol, together with seven known compounds, identified as β-sitosterol, β-sitosteryl-β-D-glucoside, 6β-hydroxy-campest-4-en-3-one, 5α,8α-epidioxyergosta-6,22-dien-3β-ol, tricin, kaempferol and p-coumaric acid. The isolated compounds were identified by one...

Orientational constraints obtained from solid state NMR experiments on anisotropic samples are used here in molecular dynamics (MD) simulations for determining the structure and dynamics of several different membrane-bound molecules. The new MD technique is based on the inclusion of orientation dependent pseudo-forces in the COSMOS-NMR force field. These forces drive molecular rotations and re-...

This article is a review with 83 references of the application of NMR to the measurement of the dissociation constants of protein-ligand complexes. After briefly discussing some general concepts of molecular stability, the text turns to consider which NMR parameters are reporters of complex formation. The available data treatments required to translate observed NMR effects into quantitative mea...

Toxicity of methylmercury (MeHg) to wildlife and humans results from its binding cysteine residues proteins, forming MeHg-cysteinate (MeHgCys) complexes that hinder biological functions. MeHgCys can be detoxified in vivo, yet how this occurs is unknown. We report are transformed into selenocysteinate [Hg(Sec)4] multiple animals two phyla (a waterbird, freshwater fish, earthworms) sampled differ...

In the nuclear magnetic resonance (NMR) test of coal, when spinning frequency magic-angle (MAS) is less than range chemical shift anisotropy, serious aromatic carbon sidebands will appear. Existing solutions to sideband effect, such as changing MAS frequency, inserting total suppression (TOSS) pulse sequences, or simply defining peak after 200 ppm peaks generated by peak, multipling identified ...

A complementary approach that combines NMR measurements, analysis of X-ray and neutron powder diffraction data and advanced quantum mechanical calculations was employed to study the α-polymorph of L-polylactide. Such a strategy, which is known as NMR crystallography, to the best of our knowledge, is used here for the first time for the fine refinement of the crystal structure of a synthetic pol...

The measurement of diffusion parameters like activation energies and translational jump rates of small cations plays a key role in materials science. Especially the in-depth investigation of Li diffusion in ionic conductors is of great interest, because suitable ionic conductors are needed for, e. g., the development of new secondary ion battery systems. As the standard tracer method is not app...