نتایج جستجو برای: spin group

تعداد نتایج: 1095872  

2008
Yaakov Friedman

We show that the triple product defined by the spin domain (Bounded Symmetric Domain of type 4 in Cartan’s classification) is closely related to the geometric product in Clifford algebras. We present the properties of this tri-product and compare it with the geometric product. The spin domain can be used to construct a model in which spin 1 and spin1/2 particles coexist. Using the geometric tri...

1996
A. Avakyan T. Hakobyan A. Sedrakyan

We construct the family of spin chain hamiltonians, which have affine quantum group symmetry U q ˆ g. Their eigenvalues coincide with the eigen-values of the usual spin chain hamiltonians, but have the degeneracy of levels, corresponding to affine U q ˆ g. The space of states of these spin chains is formed by the tensor product of fully reducible representations. The fermionic representations o...

Journal: :iranian journal of radiation research 0
n.n.a razak school of physics, university sains malaysia, 18000, pulau pinang, malaysia a.a. rahman 1school of physics, university sains malaysia, 18000, pulau pinang, malaysia s. kandaiya 1school of physics, university sains malaysia, 18000, pulau pinang, malaysia i.s. mustafa 1school of physics, university sains malaysia, 18000, pulau pinang, malaysia a.a. mahmoud 1school of physics, university sains malaysia, 18000, pulau pinang, malaysia n.z. yahaya school of distance education, university sains malaysia, 18000, pulau pinang, malaysia

background: an effective polymer gel dosimeter can be fabricated by varying the composition of its chemical components. materials and methods: the magat gel dosimeter formulations that used different compositions of methacrylic acid (maa) and gelatin were extensively investigated in the present study according to the r2–dose response and r2–dose sensitivity. the irradiation of magat gel was per...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1973
J M Boggs J C Hsia

The acyl chain of spin-labeled fatty acids intercalates between the lipid hydrocarbon chains in hexagonal and micellar phases with the carboxyl group anchored at the lipid water interface. The spectra are characteristic of anisotropic motion and cannot be distinguished from the spectra of these probes in lamellar dispersions. In the hexagonal and micellar phases the molecular motion of the spin...

Journal: :Journal of biomolecular NMR 2011
Vincenzo Venditti Nicolas L Fawzi G Marius Clore

Methyl-transverse relaxation optimized spectroscopy is rapidly becoming the preferred NMR technique for probing structure and dynamics of very large proteins up to ~1 MDa in molecular size. Data interpretation, however, necessitates assignment of methyl groups which still presents a very challenging and time-consuming process. Here we demonstrate that, in combination with a known 3D structure, ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1972
S Eletr A D Keith

Cultures of a yeast mutant, deficient in the synthesis of unsaturated fatty acids, were supplemented with either stearolic acid or with any one of three octadecanoic acids having a cis double bond 6, 9, or 11 carbons away from the acyl group. The resulting cells, with lipid alkyl chains well defined with respect to the position and nature of unsaturated sites, were then studied with spin-labele...

Journal: :The journal of physical chemistry. B 2010
Ziwei Zhang Mark R Fleissner Dmitriy S Tipikin Zhichun Liang Jozef K Moscicki Keith A Earle Wayne L Hubbell Jack H Freed

An extensive set of electron spin resonance spectra was obtained over a wide range of frequencies (9, 95, 170, and 240 GHz) and temperatures (2 to 32 degrees C) to explore the dynamic modes of nitroxide-labeled T4 lysozyme in solution. A commonly used nitroxide side chain (R1), or a methylated analogue with hindered internal motion (R2), was substituted for the native side chain at solvent-expo...

2012
W. LOHMANN WOLFGANG LOHMANN

The effect of various non-SH-containing amino acids on an electron spin resonance spectrum as well as on an optical absorption spectrum of an aqueous copper (II) solution was investigated. The data obtained indicate that a charge-transfer complex is formed with amino acids acting as electron donors. A plot of the wavelength of the CT-band vs. the pK values of the carboxyl group exhibits a strai...

Journal: :Magnetic resonance in chemistry : MRC 2005
S L Fiedler J Eloranta

The effects of solvent dielectric response on the isotropic hyperfine coupling constants of the 1,4-benzoquinone, 1,4-naphthoquinone and 9,10-anthraquinone anions and 1,4-naphthalenediol cation radicals were studied by electron spin resonance (ESR) spectroscopy and by the theoretical density functional method within the polarizable continuum model. Experimental results demonstrate that the isot...

2004
E. P. Danieli H. M. Pastawski P. R. Levstein

We formulate the many-body spin dynamics at high temperature within the non-equilibrium Keldysh formalism. For the simplest XY interaction, analytical expressions in terms of the one particle solutions are obtained for linear and ring configurations. For small rings of even spin number, the group velocities of excitations depend on the parity of the total spin projection. This should enable a d...

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