Results 251 to 260 of about 311,501 (299)

Side chain dynamics monitored by 13C-13C cross-relaxation

Journal of Biomolecular NMR, 2004
A method to measure (13)C-(13)C cross-relaxation rates in a fully (13)C labeled protein has been developed that can give information about the mobility of side chains in proteins. The method makes use of the (H)CCH-NOESY pulse sequence and includes a suppression scheme for zero-quantum (ZQ) coherences that allows the extraction of initial rates from ...
Houben, K., Boelens, R.
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A Method for Obtaining 13C Isotopomer Populations in 13C-Enriched Glucose

Analytical Biochemistry, 1994
13C NMR analysis of 13C-enriched glucose containing multiple isotopomers is hampered by chemical shift similarities of several carbon resonances and by the presence of two anomeric forms. A convenient and quantitative method of enzymatically oxidizing glucose to gluconate in tissue and perfusate extracts is presented.
J G, Jones, G L, Cottam, B C, Miller, A D, Sherry, C R, Malloy   +4 more
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Oxidation of exogenous [13C]galactose and [13C]glucose during exercise

Journal of Applied Physiology, 1995
The present study examined the oxidation of exogenous galactose or glucose during prolonged submaximal cycling exercise. Eight highly trained volunteers exercised on two occasions on a cycle ergometer at 65% of maximal workload for 120 min, followed by a 60-min rest period and a second exercise bout of 30 min at 60% maximal workload.
D P, Leijssen, W H, Saris, A E, Jeukendrup, A J, Wagenmakers   +3 more
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Comparative absorption of [13C]glucose and [13C]lactose by premature infants

The American Journal of Clinical Nutrition, 1990
Oxidation of orally administered [13C]glucose and [13C]lactose and fecal recovery of malabsorbed substrates were determined in two groups of premature infants. Eighteen studies were performed with six infants at Johns Hopkins Hospital (JHH); 24 studies were performed with nine infants at Columbus Children's Hospital (CCH).
R D, Murray, T W, Boutton, P D, Klein, M, Gilbert, C L, Paule, W C, MacLean   +5 more
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Preparation, 13C NMR characterization, and enzymatic transformation of [U-13C]chorismate to [U-13C]prephenate and [U-13C]hydroxyphenyl pyruvate

Bioorganic Chemistry, 1992
Abstract Chorismate is the common precursor of the aromatic amino acids and a variety of plant and microbial natural products. [U- 13 C]Chorismate has been prepared from[U- 13 C]glucose using Klebsiella pneumoniae 62-1. With respect to previously published procedures, our yield represents a threefold improvement.
Jayanthi S. Rajagopalan, Lin-Chi Chen, Eileen K. Jaffe   +2 more
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Tetrapyrrole biosynthesis in Anacystis nidulans; incorporation of [1-13C]-, [2-13C]-, [1,2-13C]- and [2-13C, 2-2H3]acetate

Phytochemistry, 1984
Abstract Labelling experiments with [2- 13 C]- and [1,2- 13 C]acetate showed that both photopigments of Anacystis nidulans , chlorophyll a and phycocyanobilin, share a common biosynthetic pathway from glutamate. The fate of deuterium during these biosynthetic events was studied using [2- 13 C, 2- 2 H 3 ]acetate as a precursor and determining the ...
Norman G. Lewis, John A. Walter, Jeffrey L.C. Wright   +2 more
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Energy levels of 17O from 13C(α,α0)13C and 13C(α,n)16O

Nuclear Physics A, 1968
The 13C(α,α)13C cross sections at c.m. angles 54.7°, 90°, 149.4° and 169.6° and 13C(α,n)16O cross sections at 0° have been measured over the range of α-particle energies 3.5 to 6.5 MeV. Angular distributions for the 13C(α,n)16O reaction have been measured at a number of energies within this range.
G.W. Kerr, J.M. Morris, J.R. Risser
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Biosynthese de la botryodiplodine, mycotoxine de penicillium roqueforti: Incorporations d'acetate[1-13C], [2-13C], [1-2 13C]et d'acide orsellinique 2-13C-carboxyle 13C], [3-4 13C]

Tetrahedron, 1984
Resume Les incorporations d'acetate [1- 13 C], [2- 13 C], [1-2 13 C]et d'acide orsellinique [2- 13 C, carboxyle- 13 C], [3-4 13 C] dans la botryodiplodine montrent que cette mycotoxine est biosynthetisee par la voie des polycetoacides. L'acide orsellinique est un precurseur de la botryodiplodine.
F. Renauld, S. Moreau, A. Lablache-Combier   +2 more
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Spin flip probability of 13C in the inelastic scattering of 13C by 12C at E(13C)=87 MeV

AIP Conference Proceedings, 1981
The spin flip probability S(θ) of 13C in the inelastic scattering of 13C to the 2+(4.44) state of 12C was observed at E(13C)=87 MeV in the particle‐gamma angular correlation experiment between scattered 13C and the subsequent de‐excitation E2 gamma radiation emitted in‐plane and out‐of‐plane.
M. Tanaka, J. Kawa, T. Fukuda, S. Nakayama, I. Miura, H. Ogata   +5 more
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Biosynthesis of Pr toxin from [1,2-13C]acetate: occurrence of induced 13C13C coupling

Phytochemistry, 1981
Abstract The biosynthesis of PR toxin was studied by incorporation of [1,2- 13 C]acetate.
Serge Moreau, Alain Lablache-Combier, Jean Biguet   +2 more
openaire   +1 more source