Results 261 to 270 of about 150,353 (308)

Synthesis of 6-15N and 1-15N labeled adenosine monophosphates

Tetrahedron, 1988
Abstract A chemical synthesis of 6-15N and 1-15N AMPs from 5'-O-acety1-2',3'-O-isopropylideneinosine is reported.
Simon R. Sarfati, Vinod K. Kansal
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Synthesis and hyperpolarized 15N NMR studies of 15N-choline-d13

Tetrahedron, 2013
Abstract 15N-Choline-d13 was synthesized as a new biomarker for dynamic nuclear polarization, and the lifetime of the polarized signal governed by the spin–lattice relaxation time T1 was measured. 15N-Choline-d13 exhibited a T1 that was over twice as long as that of 15N-choline, and the hyperpolarized 15N signal could be observed for 1 h.
Keiko Kumagai, Kazuyasu Kawashima, Mai Akakabe, Masayuki Tsuda, Takamasa Abe, Masashi Tsuda   +5 more
openaire   +1 more source

15N Chemical Shifts

1981
Compilation until 1979 of the literature on 15N parameters, namely chemical shifts and coupling constants, has provided a large amount of data. Examination of Fig. 1.1 shows that most 15N resonances lie in a 500 ppm range, although some compounds, such as nitroso derivatives, extend the field of δ 15N to 800 ppm.
Gérard J. Martin, Maryvonne L. Martin, Jean-Paul Gouesnard   +2 more
openaire   +1 more source

Synthesis of 15N-labeled phthalimide

Applied Radiation and Isotopes, 2006
A new method for preparing 15N-labeled phthalimide from the reaction between phthalic anhydride and 15N-urea (99.34% 15N) in the presence of ortho-xylene is described in this work. Reaction conditions were the mole ratio of phthalic anhydride to 15N-urea (99.34% 15N) of 3-1 at 140 degrees C and under atmospheric pressure.
Zhanfeng, Liu, Qipeng, Yuan
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Méthodologie 15N

1997
2 tables 4 graph. Partie "Allocation de l'azote au cours de la croissance et du développement de la plante" chap.
Deléens, E., Morot-Gaudry, J.F., Martín, F., Thoreux, A., Gojon, Alain   +4 more
openaire   +1 more source

Synthesis of DL-α-15N-tryptophan from 1-15N-hydantoin

Journal of Labelled Compounds and Radiopharmaceuticals, 1999
DL-α-15N-Tryptophan was prepared by the use of Al-Ni alloy as reducing agent from 1-15N-hydantoin and indole-3-aldehyde via three steps and 1-15N-hydantoin was prepared from15N-glycine. The yield of 1-15N-hydantoin based on 15N-glycine was 89.3% and the yield of DL-α-15N-tryptophan based on 1-15N-hydantoin was 84%, giving an over-all yield from 15N ...
Ganghua Tang, Xiaolan Tang, Shihchen Wang, Guohui Jiang, Shuqin Wu   +4 more
openaire   +1 more source

15N chemical shift tensors and conformation of solid polypeptides containing 15N-labeled glycine residue by 15N NMR

Journal of Molecular Structure, 1998
Abstract The correlation between the isotropic 15 N chemical shift ( δ iso ) and 15 N chemical shift tensor components ( δ 11 , δ 22 and δ 33 ) and the main-chain conformation such as the polyglycine I (PGI: β-sheet), II (PGII: 3 1 -helix), α-helix and β-sheet forms of solid polypeptides [Gly∗,X] n consisting of 15 N-labeled glycine (Gly∗
Akira Shoji, Takuo Ozaki, Teruaki Fujito, Kenzo Deguchi, Isao Ando, Jun Magoshi   +5 more
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CROLOY 15-15N

Alloy Digest, 1957
Abstract CROLOY 15-15N is a super strength iron-base austenitic steel for high temperature application under extreme pressure conditions. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep.
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15N-15N-Kopplungskonstante und Rotationsbarriere von Nitrosaminen

Angewandte Chemie, 1984
Heinz Bandmann, Peter Heymanns, Carola Siem, Paul Rademacher   +3 more
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A Convenient Synthesis of 15N-Labeled Diethylenetriamine[(15N)Dien] and Ethylenediamine [(15N)En]

Synthesis, 1997
Erle Zang, Peter J. Sadler
openaire   +1 more source