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  • PACS. 75.10.Jm Quantized spin models - 75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions  (1)
  • Theromyzon tessulatum  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Generalized nonlinear sigma model approach to alternating spin chains and ladders (2000)
    Springer
    The European physical journal 14 (2000), S. 47-52 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.10.Jm Quantized spin models - 75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We generalize the nonlinear sigma model treatment of quantum spin chains to cases including ferromagnetic bonds. When these bonds are strong enough, the classical ground state is no longer the standard Néel order and we present an extension of the known formalism to deal with this situation. We study the alternating ferromagnetic-antiferromagnetic spin chain introduced by Hida. The smooth crossover between decoupled dimers and the Haldane phase is semi-quantitatively reproduced. We study also a spin ladder with diagonal exchange couplings that interpolates between the gapped phase of the two-leg spin ladder and the Haldane phase. Here again we show that there is a good agreement between DMRG data and our analytical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050105
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  • 2
    Electronic Resource
    Electronic Resource
    Immunohistochemical localization of opioid peptides in the brain of the leech Theromyzon tessulatum (1987)
    Springer
    Cell & tissue research 250 (1987), S. 63-71 
    Details
    ISSN: 1432-0878
    Keywords: Opioid peptides ; Immunohistochemistry ; Annelida: Hirudinea ; Theromyzon tessulatum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary By use of antisera directed against met-enkephalin, leu-enkephalin, dynorphin or α-neoendorphin, immunoreactive structures were visualized in the central nervous system and proboscis of the leech Theromyzon tessulatum. Their distribution in the various compartments of the supra- and subesophageal ganglia was mapped. No correspondence could be established between the neurons containing met- or leu-enkephalin-like substances and the different types of neurosecretory cells classically described in Hirudinea. Successive localization of leu- and met-enkephalin on the same section revealed that these two peptides occur in different neurons. Only one cell located in compartment 6 of the supraesophageal ganglion was both dynorphin- and leu-enkephalin-positive. The other dynorphinimmunoreactive cells were not stained with the anti-leuenkephalin serum. The α-neoendorphin-immunopositive cells were leu-enkephalin immunonegative and vice versa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214655
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    Paper (German National Licenses)
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