Results 281 to 290 of about 1,362,496 (337)
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1H and 2H NMR mobility in cellulose
Carbohydrate Polymers, 2001Abstract Mobility of water in cellulose was studied by solid-state 1H and high-resolution 2H NMR as a function of moisture content within the unfreezable moisture range (0–19% dry basis). Measurements of relative mobilities were based on relative intensities, transverse and longitudinal relaxation times and lineshape analysis.
Vittadini E. +2 more
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2009
Electronegative substituents cause a decrease in |J|gem while a double or triple bond next to the CH2 group causes an increase.
Ernö Pretsch +2 more
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Electronegative substituents cause a decrease in |J|gem while a double or triple bond next to the CH2 group causes an increase.
Ernö Pretsch +2 more
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Lipid Profiling Using 1H NMR Spectroscopy
2019Lipid profiling, which includes fatty acids, phospholipids, glycerides, and cholesterols is extremely important because of the essential role lipids play in the regulation of metabolism in animals. 1H-NMR-based protocols for high-throughput lipid analysis in complex mixtures have been developed and applied to biological systems.
Miriam, Gil +3 more
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Rubber Chemistry and Technology, 1980
Abstract 1H NMR spectra of polyisoprene were assigned using polymers of isoprene-1,1,4,4-d4, isoprene-1,1,5,5,5-d5, and isoprene-4,4-d2 polymerized with various catalysts. The methylene-proton signal at 2.1 ppm in cis-1,4- and trans-1,4-polyisoprenes was divided into H4- and H1-proton signals; H4 resonated at 2.21 ppm in both cis-1,4
H. Sato, Y. Tanaka
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Abstract 1H NMR spectra of polyisoprene were assigned using polymers of isoprene-1,1,4,4-d4, isoprene-1,1,5,5,5-d5, and isoprene-4,4-d2 polymerized with various catalysts. The methylene-proton signal at 2.1 ppm in cis-1,4- and trans-1,4-polyisoprenes was divided into H4- and H1-proton signals; H4 resonated at 2.21 ppm in both cis-1,4
H. Sato, Y. Tanaka
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Double-quantum filtered 1H MAS NMR spectra
Solid State Nuclear Magnetic Resonance, 2005It is shown that straightforward double-quantum filtered (1)H MAS NMR experiments yield spectral lineshapes that permit to estimate the minimum number of (1)H spins in a cluster. The approach may offer an alternative to multiple-quantum experiments for the characterisation of (1)H spin clusters of moderate size.
Matthias, Bechmann +3 more
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1H NMR spectroscopy of cytochrome cd1 derivatives
Archives of Biochemistry and Biophysics, 1985Proton nuclear magnetic resonance spectra are reported for cytochrome cd1 from Pseudomonas aeruginosa (ATCC 19429) in several forms including complexes of the ferricytochrome with cyanide, azide, and fluoride, a quasi-apo form in which the noncovalently associated heme d1 has been removed but the covalently bound heme c is retained, and the reduced ...
R, Timkovich, M S, Cork, P V, Taylor
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Complete 1H NMR assignment of cholesteryl benzoate
Steroids, 2018The 750 MHz 1H NMR spectrum of cholesteryl benzoate (1b) could be assigned completely, which means all chemical shifts and all coupling constants, including some long-range values, were established. This task was possible by extracting many approximate coupling constant values in the overlapped spectrum region from an HSQC experiment, and using these ...
Nury, Pérez-Hernández +2 more
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Quantitative 1H-NMR analysis of amniotic fluid
Journal of Pharmaceutical and Biomedical Analysis, 1993Ten amniotic fluid samples (36-38 weeks gestation) are analysed by NMR spectroscopy. Of the species identified in the spectra, valine (mean 198 microM: SEM 57 microM), lactate (9.73 mM; 2.05 mM), alanine (689 microM: 115 microM), acetate (6.87 mM: 1.54 mM), citrate (363 microM: 59 microM), glucose (4.54 mM: 1.28 mM) indoxyl-sulphate (n = 4,270 microM),
P E, McGowan +5 more
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1990
Proton nuclear magnetic resonance (1H-NMR) provides a sensitive means to detect biochemical changes in living systems (Ackerman et al 1981, Gadian 1982). The usefulness of 1H-NMR for in vivo studies has been shown in hypoxia (Behar et al 1983), hypoglycemia (Behar et al 1985), seizures (Petroff et al 1986), and ischemia (Gadian et al 1986, Crockard et ...
G. A. Rosenberg +4 more
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Proton nuclear magnetic resonance (1H-NMR) provides a sensitive means to detect biochemical changes in living systems (Ackerman et al 1981, Gadian 1982). The usefulness of 1H-NMR for in vivo studies has been shown in hypoxia (Behar et al 1983), hypoglycemia (Behar et al 1985), seizures (Petroff et al 1986), and ischemia (Gadian et al 1986, Crockard et ...
G. A. Rosenberg +4 more
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1H NMR studies on lanthanides substituted transferrins
Journal of Inorganic Biochemistry, 1991The binding of lanthanide(III) ions to human serum apotransferrin has been investigated through 1H NMR spectroscopy. Several well resolved isotropically shifted signals have been observed between 100/-100 ppm for the Tm, Tb, Yb and Dy derivatives. Significant spectroscopic inequivalence of the two metal binding sites has been revealed.
MESSORI, LUIGI, PICCIOLI, MARIO
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