EXAFS investigations of temperature-dependent structure in cobalt-59 molecular NMR thermometers

Nmr Investigations of Protein Structure

Thermometers for low temperature Magic Angle Spinning NMR.

The measurement of temperature in a Magic Angle Spinning NMR probe in the temperature range 85-300K is discussed. It is shown that the shift of the (119)Sn resonance of Sm(2)Sn(2)O(7) makes a good thermometer with shift being given by delta=223 - 9.54x10(4)/Tppm and a potential precision of better than 0.5K over the entire temperature range. The sensitivity is such (e.g. 4.2ppm/K at 150K) that ...

Temperature-Dependent Regulation of Bacterial Gene Expression by RNA Thermometers

RNA thermometers (RNATs) are cis-encoded regulatory elements that modulate transla‐ tional efficiently in response to environmental temperature. Since their initial discovery, numerous RNATs have been identified and characterized, with the majority of currently known RNATs present in a wide variety of bacterial species. RNATs repress translation at relatively low temperatures by physically prev...

Investigations of Random Molecular Motions by NMR

The aim of this contribution is to demonstrate that NMR spin relaxation is an efficient method for the investigation of random molecular motions. Information on random motion is important for the characterization of liquids, polymers, and biological samples. Random motions are time-dependent phenomena and have to be treated with timedependent statistical mechanics. On the other hand, spin relax...

EXAFS Investigations of Metal Organic Synthesis Tools

Grignard Compounds RMgX (R=organic group; X=Cl, Br, I) are common tools in inorganic and organic synthesis. The structure of these substances in solution, however, is unknown. To answer this question we performed EXAFS measurements at the Br-K-edge in absorption mode and at the Mg-K-edge in fluorescence mode. Rom these complementary data a consistent model of the structure of the investigated G...