Results 241 to 250 of about 320,692 (287)
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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 +2 more
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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 +2 more
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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 +2 more
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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 +2 more
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Archives of Pharmacal Research, 2013
The elucidation of the structures of complex natural products bearing many quaternary carbons remains challenging, even in this advanced spectroscopic era. (13)C-(13)C COSY NMR spectroscopy shows direct couplings between (13)C and (13)C, which comprise the backbone of a natural product.
Yun, Kwon +3 more
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The elucidation of the structures of complex natural products bearing many quaternary carbons remains challenging, even in this advanced spectroscopic era. (13)C-(13)C COSY NMR spectroscopy shows direct couplings between (13)C and (13)C, which comprise the backbone of a natural product.
Yun, Kwon +3 more
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Biosynthesis of Pr toxin from [1,2-13C]acetate: occurrence of induced 13C13C coupling
Phytochemistry, 1981Abstract The biosynthesis of PR toxin was studied by incorporation of [1,2- 13 C]acetate.
Serge Moreau +2 more
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Energy levels of 17O from 13C(α,α0)13C and 13C(α,n)16O
Nuclear Physics A, 1968The 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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Fusion cross-section measurements for the 13C+13C reaction
Nuclear Physics A, 1982Abstract Absolute γ-ray yields from characteristic low-lying levels in nuclei produced in the 13 C+ 13 C reaction have been measured from E c.m. = 4.0 to 15.8 MeV using an intrinsic germanium detector. Statistical-model calculations of the decay modes of the compound nucleus have been used to deduce absolute cross sections for the production of ...
J.L. Charvet +4 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, 1981The 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 +5 more
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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 +2 more
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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 +2 more
openaire +1 more source