ODESSA experiment

Gerardy-Montouillout V, Malveau C, Tekely P, Olender Z and Luz Z 1996 Odessa, a new 1 D NMR exohange experiment for ohemioally equivalent nuolei in rotating solids J. Magn. Reson. A 123 7-15... 

The one-dimensional exchange experiment ODESSA (see Section 2.4) was used in a study of the effects of hydration in the protein barstar and the polypeptide polyglycine.116 For the experiments on barstar, a uniformly labelled 15N sample was used, and natural-abundance 13C was used for polyglycine. Only the wet barstar sample showed any signs of molecular reorientation in this case, with correlation times between 50 and 100 ms. 

V. Gerardy-Montouillout, C. Malveau, P. Tekely, Z. Olender and Z. Luz, ODESSA, a new ID NMR exchange experiment for chemically equivalent nuclei in rotating solids.. Magn. Reson. A, 1996,123, 7-15. 

G. K. Boreskov was bom in Omsk on April 20, 1907. On graduating from the Odessa Chemical Institute in 1929 he became head of an industrial laboratory of catalysis. It was under his leadership that the first home catalysts for S02 oxidation and methods of calculating commercial reactors were developed. Later he summarized his experience in the book Catalysis for Sulfuric Acid Production, which was published in 1954 and retains its value to the present day. 

The pulse sequence used by these authors is ODESSA (one-dimensional exchange spectroscopy by sideband alternation) [48], The experiment is based on the fact that intermolecular distances between chemically equivalent nuclei differ significantly in racemates and enantiomers according to slight but substantial... 

For low-frequency motions (10 -10 s), the 2D exchange experiments are useful techniques (19). Other exchange experiments are also informative, e.g., the one-dimensional exchange spectroscopy by sideband alternation (ODESSA) (151), time-reversed ODESSA (152), and centerband-only detection of exchange (CODEX) (153). Many advanced techniques are given in a recent, excellent review by Brown and Spiess (14). 

D. Reichert, H. Zimmermann, T.P. Tekely, R. Poupko, Z. Luz, Time-reverse ODESSA. AID exchange experiment for rotating solids with several groups of equivalent nuclei, J. Magn. Reson. 125 (1997) 245—258. 

The ultraslow motions can be observed by exchange NMR experiments. There are a number of techniques, performed in ID and 2D modes which are based on the manipulation of spinning sidebands under MAS. The first of them, applied to study of solid peptides was ODESSA (one-dimensional exchange spectroscopy by sideband-alternation) [76] and next the time-reversed ODESSA [77] (tr-ODESSA). The interesting modification, which represents this group of sequences is CODEX (centreband-only detection of exchange) introduced by Schmidt-Rohr and coworkers [78]. CODEX can be executed at any MAS speed, while ODESSA and tr-ODESSA... 

In 1922, Frumkin also departed for Moscow, where he hoped to perform some experiments that he could not perform in Odessa, due to the lack of equipment. In Moscow, he encountered Aleksey Nikolayevich Bakh (1857-1946) the famous biochemist and political radical, who, 5 years earlier, had returned from exile overseas. This meeting was crucial for the future life of Frumkin. 

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