ZfN: Search Results

1	Author	Ulrike Werner-Zwanziger, Marcia Ziegeweid, Bruce Black, Alexander Pines	Requires cookie*
	Title	Nitrogen-14 SQ U ID N Q R of L-Ala-L-His and of Serine
	Abstract	In honor of Professor Dr. Werner Miiller-Warmuth on his 65 th birthday 14N nuclear quadrupole resonance spectroscopy, detected with a Superconducting Quantum Interference Device, makes possible the study of nitrogen environments in amino acids and small peptides. The present experiments characterize: 1) the effects of intermolecular interactions upon the amino nitrogen of serine upon cocrystallization of the stereoisomers in a range of concentrations; 2) the changes of the amino and imidazole nitrogen environments brought about by combining L-Alanine and L-Histidine into the dipeptide L-Ala-L-His.
	Reference	Z. Naturforsch. 49a, 1188—1192 (1994); received August 22 1994
	Published	1994
	Keywords	SQUID, NQR, Amino acids, Nitrogen-14
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	TEI-XML for	default:Reihe_A/49/ZNA-1994-49a-1188.pdf
	Identifier	ZNA-1994-49a-1188
	Volume	49

2	Author	B. Karabulut, R. Tapramaz, A. Bulut	Requires 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

3	Author	Halil Oturak, Adnan Sağlam, Semiha Bahçeli	Requires 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