Determination of substituent distribution in cellulose ethers by means of a carbon-13 NMR study on their acetylated derivatives. 1. Methylcellulose

1987 ◽  
Vol 20 (10) ◽  
pp. 2413-2418 ◽  
Author(s):  
Yasuyuki Tezuka ◽  
Kiyokazu Imai ◽  
Mitsuyoshi Oshima ◽  
Toru Chiba
Keyword(s):  
Cellulose Ethers ◽  
Substituent Distribution ◽  
Nmr Study

NMR study of hydrogen diffusion and phase determination of the Mg2NiHx system

1980 ◽  
Vol 73 (10) ◽  
pp. 4758-4764 ◽  
Author(s):  
S. D. Goren ◽  
C. Korn ◽  
M. H. Mintz ◽  
Z. Gavra ◽  
Z. Hadari
Keyword(s):  
Hydrogen Diffusion ◽  
Phase Determination ◽  
Nmr Study

23Na-NMR study of cation cotransport in human red blood cells

1992 ◽  
Vol 262 (5) ◽  
pp. C1292-C1296 ◽  
Author(s):  
M. Cacciafesta ◽  
V. Marigliano ◽  
C. Ferri ◽  
G. Piccirillo ◽  
A. Scuteri ◽  
...  
Keyword(s):  
Sodium Concentration ◽  
Shift Reagent ◽  
External Signal ◽  
Human Red Blood Cells ◽  
Nmr Study ◽  
Healthy Adult Male ◽  
Male Subjects ◽  
Range Of Values ◽  
23Na Nmr

Na(+)-K+ cotransport in human erythrocytes from healthy subjects has been studied by means of 23Na-nuclear magnetic resonance (NMR) in the presence of the anionic paramagnetic shift reagent dysprosium (III) tripolyphosphate [Dy(PPP)2(7-)]. The intra- and extracellular 23Na-NMR signals were well separated, giving values of 6 +/- 1 mM for internal sodium concentration. Determination of the furosemide-sensitive Na+ efflux, in the presence of ouabain, was obtained by correlating the chemical shift variation of the external signal with changes in external Na+ concentration. For this purpose, calibration curves were generated. The values of the maximum efflux velocity (Vmax; 0.29-1 mmol.h-1.l cells-1) measured in 10 healthy adult male subjects were found to be within the range of values obtained by other authors. The NMR method proposed for the study of Na(+)-K+ cotransport is relatively simple and allows quick evaluation of cotransport Vmax values for a number of samples, being a good candidate for the study of this transport mechanism in the presence of different pathologies.

Determination of Absolute Stereochemistry of 2-Alkylmorpholines by a13C NMR Study of Steroid Derivatives

1996 ◽  
Vol 34 (1) ◽  
pp. 59-62 ◽  
Author(s):  
L. Fielding ◽  
N. Hamilton ◽  
R. McGuire ◽  
M. Maidment ◽  
A. C. Campbell
Keyword(s):  
Nmr Study ◽  
Absolute Stereochemistry

scholarly journals Solutions of Gallium Trichloride in Ethers: A 71Ga NMR Study and the X-Ray Structure of GaCl3 · Monoglyme

1990 ◽  
Vol 45 (7) ◽  
pp. 979-984 ◽  
Author(s):  
Stefan Böck ◽  
Heinrich Nöth ◽  
Astrid Wietelmann
Keyword(s):  
Nmr Spectroscopy ◽  
Structure Determination ◽  
X Ray ◽  
Predominant Species ◽  
Nmr Study ◽  
Gallium Trichloride

Solutions of GaCl3 in various ethers have been studied by 71Ga NMR spectroscopy. σ71Ga data indicate that the predominant species in diethylether and tetrahydrofuran solutions are GaCl3 · O(C2H5)2 and GaCl3. 2OC4H8, respectively. However, in monoglyme solution dissociation occurs and the product crystallizing from the solution is [cis-GaCl2(monoglyme)2]GaCl4 as demonstrated by an X-ray structure determination of the solvate GaCl3 · monoglyme.

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