منابع مشابه
Thermal denaturation of ribonuclease A characterized by water 17O and 2H magnetic relaxation dispersion.
Water oxygen-17 and deuteron nuclear magnetic relaxation dispersion (NMRD) measurements were used to characterize ribonuclease A (RNase A) in the course of thermal denaturation at pH 2 and 4. The structure and dynamics of the protein were probed by specific long-lived water molecules, by the short-lived surface hydration, and by labile side-chain hydrogens. The NMRD data show that native RNase ...
متن کاملSimultaneous analysis of 17O/16O, 18O/16O and 2H/1H of gypsum hydration water by cavity ring‐down laser spectroscopy
RATIONALE The recent development of cavity ring-down laser spectroscopy (CRDS) instruments capable of measuring (17) O-excess in water has created new opportunities for studying the hydrologic cycle. Here we apply this new method to studying the triple oxygen ((17) O/(16) O, (18) O/(16) O) and hydrogen ((2) H/(1) H) isotope ratios of gypsum hydration water (GHW), which can provide information a...
متن کامل17O NMR in planes and chains of YBa2Cu3O7
2014 We report the first observation of 17O NMR spectra in YBa2Cu3O7 obtained after selective gas exchanges performed at 300 and 850°C. We are able to assign the narrow (weakly shifted) signal to the (1/2, 1/2) transition of oxygen atoms in CuO chains and the broad (strongly shifted) signal to the 0-sites in CuO2 planes. J. Phys. France 49 (1988) 1825-1828 NOVEMBRE 1988, Classification Physics,...
متن کاملSolid-state NMR studies of 17O-enriched pyrophosphates.
For the first time, 17O NMR studies were performed on 17O-enriched crystalline pyrophosphates (magnesium-, sodium- and barium-pyrophosphate) by means of triple-quantum magic-angle spinning (3QMAS) and double-rotation (DOR) in the high external field of 17.6 T. Oxygen atoms in bridging positions (P-OB-P) exhibit a significant higher quadrupole coupling constant compared to oxygen atoms in termin...
متن کاملWater in cellulose: evidence and identification of immobile and mobile adsorbed phases by 2H MAS NMR.
The organization of water molecules adsorbed onto cellulose and the supramolecular hydrated structure of microfibril aggregates represents, still today, one of the open and complex questions in the physical chemistry of natural polymers. Here, we investigate by 2H MAS NMR the mobility of water molecules in carefully 2H-exchanged, and thereafter re-dried, microcrystalline cellulose. By subtracti...
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ژورنال
عنوان ژورنال: Journal of Japan Society on Water Environment
سال: 1993
ISSN: 0916-8958,1881-3690
DOI: 10.2965/jswe.16.409