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'Amino acids' in keywords Facet   Publication Year 1999  [X]
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1Author    B. Karabulut, R. Tapramaz, A. BulutRequires cookie*
 Title    EPR Studies of Cu 2+ in dl-Aspartic Acid Single Crystals  
 Abstract    EPR studies of Cu 2+ doped dl-Aspartic Acid [NH 2 CH(CH 2 COOH)COO] powder and single crystal have been carried out at 113 and 300 K. The principal hyperfine and g values, covalancy parameter, mixing coefficients and Fermi-contact term of the complex were obtained, and the ground-state wavefuntion of the Cu 2+ ion in the lattice has been constructed. 
  Reference    Z. Naturforsch. 54a, 256—260 (1999); received January 11 1999 
  Published    1999 
  Keywords    Electron Paramagnetic Resonance, dl-Aspartic Acid, Amino Acid 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0256.pdf 
 Identifier    ZNA-1999-54a-0256 
 Volume    54 
2Author    Halil Oturak, Adnan Sağlam, Semiha BahçeliRequires cookie*
 Title    /-Modulation in ID NMR l H Spectrum of Taurine and Aspartate Using Spin-Echo Technique  
 Abstract    This study reports on a theoretical calculation of Hahn's spin-echo experiment in case of a model A 2 Bt spin system with a strongly coupling character and gives the experimental results of one-dimen-sion n H high-resolution NMR spectra of taurine and aspartate. The calculated amplitudes of the spin-echoes for two different proton groups of taurine are given. Using results of our calculations for tau-rine, the computer simulations of /-modulation are implemented. It is shown that the agreement be-tween the experimental and simulated spectra is good. 
  Reference    Z. Naturforsch. 54a, 305—310 (1999); received February 24 1999 
  Published    1999 
  Keywords    NMR, Amino Acids, A 2 B 2 System, /-modulation 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0305.pdf 
 Identifier    ZNA-1999-54a-0305 
 Volume    54 
3Author    IvankaG. Stankova3, M. Ario, F. Simeonovb, Vera Maximova0, AngelS. Galabov0, EvgenyV. GolovinskydRequires cookie*
 Title    Synthesis and Anti-Virus Activity of Some Nucleosides Analogues  
 Abstract    New 3'-, 5'-, 5-bromo-2'-deoxyuridine (3 a -g) and 3'-, 5'-thymidine (4 a -i) analogues with amino acid and peptide residues were synthesized and evaluated for antiviral activity. The influence of long peptide chains, essential amino acids and the effect of this structural modifi­ cation on the antiviral activity has been also reported. Three 5-bromo-2'-deoxyuridine derivatives containing glycyl-, glycyl-glycyl-and glycyl-gly-cyl-glycyl-residues (3a, 3b, 3c) showed a strong activity against the herpes virus PsRV and a moderate one vs. HSV-1. The corresponding thymidine analogues were considerably less effective, and only com­ pounds 4d and 4h showed a borderline effect against PsRV. 
  Reference    Z. Naturforsch. 54c, 75—83 (1999); received August lO/October 20 1998 
  Published    1999 
  Keywords    5-Bromo-2'-Deoxyuridine, Thymidine, Amino Acids, Peptides, Antiherpes Activity 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0075.pdf 
 Identifier    ZNC-1999-54c-0075 
 Volume    54