Journal ArticleDOI
Nuclear Magnetic Resonance Studies in Multiple Phase Systems: Lifetime of a Water Molecule in an Adsorbing Phase on Silica Gel
J. R. Zimmerman,W. E. Brittin +1 more
TLDR
In this paper, a stochastic theory for multiphase systems sometimes encountered in relaxation phenomena is presented, and a close estimate is obtained of the life-time of a water molecuk in an adsorbing phase at low coverage on silica gel.Abstract:
Further evaluation studies of nuclear resonance relaxation phenomena of the hydrogen nuclei of HzO adsorbed on silica gel observed by means of radio frequency pulse techniques are described. A stochastic theory for multiphase systems sometimes encountered in relaxation phenomena is presented. Special emphasis is directed toward a theoretical understanding of two phase systems observed in the study of water vapor adsorbed on silica gel, Adsorption experiments are discussed which directly demonstrate, for a s ecific x / m value the simultaneous existence of (a) two phase behavior for transverse (T t ) relaxation measurements and (i) single hase behavior for longitudinal relaxation ( T I ) data. Finally, a close estimate is obtained of the life-time of a water molecuk in an adsorbing phase at low coverage on silica gel.read more
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Book ChapterDOI
Hydration of Proteins and Polypeptides
Irwin D. Kuntz,W. Kauzmann +1 more
TL;DR: The chapter presents several proposals for predicting protein hydration based on the amino acid composition of the protein; however, the two main questions concerned include—whether ionic groups are more hydrated than other polar groups, and whether the amide and peptide functions are hydrated or not.
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Journal ArticleDOI
Structural and Dynamic Parameters Obtained from 17O NMR, EPR, and NMRD Studies of Monomeric and Dimeric Gd3+ Complexes of Interest in Magnetic Resonance Imaging: An Integrated and Theoretically Self-Consistent Approach1
D. Hugh Powell,Orla M. Ni Dhubhghaill,Dirk Pubanz,Lothar Helm,Yakob S. Lebedev,Willi Schlaepfer,Andre E. Merbach +6 more
TL;DR: In this article, the results of new and previously published 17O NMR, EPR, and NMRD studies of aqueous solutions of the Gd3+ octaaqua ion and the commercial MRI contrast agents [Gd(DTPA)(H2O)] were presented.
Journal ArticleDOI
Interpretation of magnetic resonance data from water nuclei in heterogeneous systems
Bertil Halle,Håkan Wennerström +1 more
TL;DR: In this paper, a theoretical framework for the interpretation of NMR data from water nuclei (1H, 2H, and 17O) is presented, and the possibilities and limitations of the NMR technique in answering the fundamental questions about water structure and dynamics in heterogeneous systems are discussed.