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  • 1
    Electronic Resource
    Electronic Resource
    Polyclonal Antibodies to the Glycine Receptor Antagonist Strychnine (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 52 (1989), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Polyclonal antibodies have been raised in rabbits against the glycine receptor antagonist strychnine, coupled through a 2-amino substituent to the antigenic protein keyhole limpet haemocyanin. Strychnine binding of the predominantly immunoglobulin G (IgG) class of antibodies was measured by incubation with [3H]strychnine, followed by adsorption of IgG onto Staphylococcus aureus cells and filtration through glass-fibre filters under vacuum. Only strychnine and structurally related alkaloids or derivatives were able to inhibit [3H]strychnine binding to the IgG. A significant rank correlation was found between the potencies of these compounds to inhibit [3H]strychnine binding to the antibodies and to the glycine receptor in mouse spinal cord membranes. In contrast, preincubation of strychnine antibodies with a variety of ligands at other neurotransmitter, drug, or hormone receptors in the CNS (at 10−4M) failed to inhibit binding significantly. The failure of glycine to inhibit strychnine antibody binding is consistent with previous suggestions that the recognition sites for this amino acid on the CNS receptor may be conformationally distinct from those for the antagonist alkaloid. Strychnine antibodies may now help in the identification and purification of possible endogenous ligands at this alkaloid binding site in the CNS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1989.tb09197.x
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  • 2
    Electronic Resource
    Electronic Resource
    Spin wave dispersion in ferromagnetic nickel (abstract) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6896-6896 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spin wave dispersion in ferromagnetic nickel has been computed in random phase approximation using the wave vector and frequency dependent magnetic susceptibility including many body enhancement effects. The latter were included using an orbital basis to invert the susceptibility matrices that are encountered in a local density, first principles version of a Stoner-like theory of many body enhancements. The complicated computer codes employed in the calculation were tested by computing numerically the wave vector and frequency dependent spin and orbital magnetic susceptibility of the uniform electron gas and comparing with known analytic expressions. Numerical work was done using the analytic tetrahedron method. For nickel the theory was simplified by introducing a single adjustable parameter in lieu of calculation of complicated integrals involving the band structure. The parameter was adjusted to yield agreement with a long wavelength spin wave neutron scattering measurement. With the fit parameter, good agreement with the experimental dispersion of spin waves in nickel was obtained for other wavelengths as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358106
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  • 3
    Electronic Resource
    Electronic Resource
    Study of critical properties of the Potts model by the modified variational cumulant expansion method : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6347-6349 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The modified variational cumulant expansion (VCE) method valid for the whole temperature range and for arbitrary fields is developed to study the critical properties of the general q-state Potts model used to stimulate various magnetic systems. The series expansion is generated directly in terms of the Potts Hamiltonian. The free energy and the internal energy are calculated up to the third-order cumulant terms for the d-dimensional hypercubic q-state Potts model. The expression for the critical temperature Tc is derived in a closed form which allows to determine Tc up to arbitrary order cumulant terms. The modified VCE method eliminates the unphysical first-order phase transition at the mean-field critical point in the internal energy of the Potts model which plagues the conventional VCE method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358262
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  • 4
    Electronic Resource
    Electronic Resource
    Stoner theory of magnetic structure of alternate cubic phases of transition metals (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4060-4062 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial growth of bcc Co on a (110) GaAs substrate has demonstrated the feasibility of producing thin films of transition metals with structures not usually stable at room temperature and pressure. Thus an entirely new group of magnetic materials may be possible with interesting and perhaps significant magnetic properties. In this paper the simple Stoner theory of ferromagnetism is employed, with exchange-correlation parameters obtained from Janak's work and density of states at the Fermi level determined from self-consistent, paramagnetic energy-band calculations. The theory is applied to each of the 3d and 4d transition metals in both fcc and bcc phases. Ferromagnetism is obtained for bcc Fe, Co, and Mn and fcc Co and Ni, and strongly enhanced paramagnetism for bcc Sc, Ni, and Y and fcc Sc, Fe, and Pd. Comparisons are made with predictions of total energy and enhanced magnetic susceptibility calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340547
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  • 5
    Electronic Resource
    Electronic Resource
    Interlayer magnetic coupling in transition-metal multilayered structures : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4780-4782 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic coupling of two layers of Fe through an intervening layer of Cr as a function of the Cr layer thickness has been computed. By including both RKKY and superexchangelike interactions between planes of Fe, and accounting for the surface roughness of the interfaces, the experimentally observed oscillations in the coupling between Fe layers as a function of Cr layer width could be reproduced. The predominance of antiferromagnetic coupling reflects the dominance of superexchange over RKKY exchange and is a consequence of the position of the Fermi level of Cr in a minimum between peaks in the density of states. This condition can be used to explain similar behavior in Co/Ru and to identify other possible transition metal systems for which this behavior may be observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348253
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  • 6
    Electronic Resource
    Electronic Resource
    Indirect multipolar interactions in rare-earth metals and alloys (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5748-5748 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The presence of large quadrupolar interactions was observed in some rare-earth conducting systems such as DySb, TmCd, TmZn, DyZn.1 In this work, we present the results of an extensive ab initio calculation of the indirect pair interactions between rare-earth ions in transition metals arising from the polarization of the electric-multipole distribution of the conduction electrons. The effective Hamiltonian of the indirect quadrupolar pair interactions is constructed self-consistently, taking into consideration antishielding and band-structure effects in the system of conduction electrons, as well as the crystal field splitting of the rare-earth ion. Slater–Koster fits to first principles energy bands are employed to accurately account for the band-structure effects. The peculiarities of each intraband or interband contribution to the Fourier transforms of the indirect couplings as well as the role played by each type of the d electrons in the conduction band are investigated. The experimental data are discussed.2
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353559
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  • 7
    Electronic Resource
    Electronic Resource
    Erratum: "Temperature dependence of transition metal magnetism'' [J. Appl. Phys. 67, 4552 (1990)] (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3799-3799 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347205
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic susceptibility of bcc sodium (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5344-5344 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The random phase approximation has been employed to compute the spin and orbital susceptibilities of bcc sodium. The calculations were based upon a self-consistent local exchange and correlation potential and an orthogonalized plane wave basis set. Assuming no overlap between core orbitals, expressions for the necessary matrix elements were formulated and computed accurately. Convergence of various sums was investigated and the results for bcc sodium were compared with the corresponding electron gas values. While the spin susceptibility agreed well with electron gas estimates, it was 25% lower than measured values. The orbital susceptibility was found to be an order of magnitude smaller than electron gas values because of matrix element effects. Including core contributions, the total susceptibility was found to be 0.477±0.022×10–6 emu/cm3 compared with the experimental value of 0.585±0.015. Recent correlation corrections to the band structure of sodium employing the GW method have been used to account for the discrepancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353722
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetism in expanded 3d transition metals : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct−Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5685-5687 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For sufficiently large expansion of the lattice, transition metals will eventually exhibit ferromagnetism in accordance with Hund's rule. This problem has been reexamined on the basis of calculations of the paramagnetic susceptibility to determine instabilities of the paramagnetic phase. Comparison of predictions using this method for the critical lattice constant for ferromagnetism are in good agreement with previous total energy calculations. However, this study also yields new predictions of antiferromagnetism for a range of lattice constants less than that for onset of ferromagnetism. The susceptibility is formulated in a multiband generalization of the Stoner approach with many-body effects incorporated within the local-density approximation in density functional theory. Slater–Koster band structures are employed which permit lattice constant variation to be realized through a relatively simple scaling scheme. Both many-body effects and the distribution of primarily single-electron states associated with Fermi surface nesting combine to produce the antiferromagnetic instability under expansion. Nesting is probably necessary for incommensurate antiferromagnetism, and its decrease in importance as the lattice constant continues to increase contributes to the incipient ferromagnetic instability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347938
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of transition-metal magnetism (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4552-4554 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A first-principles tight-binding formulation of the paramagnetic spin susceptibility is developed to study the temperature dependence of the magnetic properties of transition metals. The formulation, which includes many-body enhancements, has been successful in predicting magnetic ground-state properties. The present study introduces a temperature-dependent analytical tetrahedron method to perform Brillouin zone sums, and employs accurate Slater–Koster band structures for convenience. Critical temperatures and the temperature dependence of the spin-density wave characterizing antiferromagnetism are determined from instabilities of the paramagnetic state toward magnetic order. The Néel temperature of Cr and the Curie temperature of Fe found in this way are in good agreement with measured values. Nonzero critical temperatures are also found for alternate cubic structures of some transition metals, further supporting the prediction of ferromagnetism in bcc Mn, and antiferromagnetism in fcc Mn and expanded bcc Ti. The computed wave vector of the spin-density wave of Cr is found to increase along the Δ line with increasing temperature following observed trends.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344867
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