Results 251 to 260 of about 150,353 (308)

Syntheses of [1-15N]-2′-Deoxyinosine, [4-15N]-2′-DeoxyAICAR, and [1-15N]-2′-Deoxyguanosine

European Journal of Organic Chemistry, 1999
A high-yield synthesis of [1-15N]-2′-deoxyinosine (5), [4-15N]-2′-deoxyAICAR (7), and [1-15N]-2′-deoxyguanosine (10) from 2′-deoxyinosine (1) using relatively low expensive 15NH3 as 15N source is described. The method exploits 2-C reactivity of 2′-deoxyinosine (1) to obtain its 15N-labelled counterpart, through [1-15N]-2′-deoxyinosine (5), and ...
CATALANOTTI, BRUNO, DE NAPOLI, LORENZO, GALEONE, ALDO, MAYOL L, OLIVIERO, GIORGIA, PICCIALLI G, VARRA M.   +6 more
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Simultaneous acquisition of [13C,15N]- and [15N,15N]-separated 4D gradient-enhanced NOESY spectra in proteins

Journal of Biomolecular NMR, 1994
The simultaneous acquisition of a 4D gradient-enhanced and sensitivity-enhanced [13C,15N]/[15N,15N]-separated NOESY is presented for the 74-residue [13C,15N]-labeled N-terminal SH3 domain of mGrb2 complexed with a peptide fragment from mSOS-2 in 90% H2O.
B T, Farmer, L, Mueller
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A study of 15N15N and 15N13C spin couplings in some 15N labeled mesoionic 1-oxa and 1-thia-2,3,4-triazoles

Journal of Molecular Structure: THEOCHEM, 1996
Abstract 15 N 15 N and 15 N 13 C spin-spin couplings are reported for seven 15 N labeled 1-oxa and 1-thia-2,3,4-triazoles and three sydnonimines. For the former class of compounds the spin-spin coupling data show a close similarity between the N2N3 and N3N4 bonds which had not previously been suspected from chemical shift measurements.
J. Jaźwiński, O. Staszewska, L. Stefaniak, G.A. Webb   +3 more
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Investigation of 15N by the reactions 11B(7Li, t)15N and 10B(7Li, d)15N

Nuclear Physics A, 1976
Abstract The 15N nucleus was investigated by two reactions at 24 MeV bombarding energy. The angular distributions were analysed by direct reaction and compound nucleus reaction model. The level structure of 15N up to 17 MeV could be explained in the presently known framework.
W. Kohler, H. Schmidt-Böcking, K. Bethge   +2 more
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The excretion of 15N in urine after administration of 15N-glycine

Biochimica et Biophysica Acta, 1954
Abstract The 15 N-abundance was determined in urine from normal persons in nitrogen balance up to 360 hours after administration of 15 N-labelled glycine. It is shown that the 15 N-abundance in excess in urine with good approximation follows the equation: a = a 1 e − B 1 t + a 2 e − B 2 t + a 3 e − B 3 t By integration of ...
K, OLESEN, N C, HEILSKOV, F, SCHØNHEYDER   +2 more
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A two-step synthesis of benzylamine-15N from ammonia-15N

Journal of Labelled Compounds and Radiopharmaceuticals, 1978
The reaction of ammonia-15N with benzaldehyde in 50% aq. methanol followed by slow removal of solvent led to a high yield of a crystalline product (benzylimine-15N). On reduction with sodium cyanoborohydride a good yield of benzylamine-15N was obtained. The synthetic usefulness of this compound is discussed.
C. Gazzola, G. L. Kenyon
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15N MAS NMR Spectroscopy of [π-15N] and [τ-15N] histidine labelled bacterial photosynthetic reaction centres

1998
A characteristic feature of the bacterial reaction centre (RC) complex is a strictly apolar transmembrane helical region holding the cofactor branches, with each transmembrane helix containing a segment of at least 16 nonpolar residues (1). It is enclosed between the globular cytoplasmic H-subunit domain and the periplasmic surface layer of the complex,
C. Soede-Huijbregts, J. J. Cappon, G. J. Boender, J. Raap, P. Gast, A. J. Hoff, J. Lugtenburg, H. J. M. de Groot   +7 more
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Synthesis of DL-α-15N-tryptophan and 2-15N-perlolyrine

Journal of Labelled Compounds and Radiopharmaceuticals, 1998
DL-α- 15 N-Tryptophan was synthesized by simple and convenient chemical reduction method,starting from α- 15 N-glycine and benzoyl chloride via five steps. The yield of DL-α- 15 N-tryptophan from α- 15 N-glycine was 46.9%. 2- 15 N-Perlolyrine was synthesized from DL- α- 15 N-tryptophan and 5-acetoxymethyl-2-formylfuran via three steps.
Ganghua Tang, Shinchen Wang, Shuqin Wu, Guohui Jiang   +3 more
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