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  • CSF flow  (1)
  • PACS. 71.27.+a Strongly correlated electron systems; heavy fermions - 75.40.Mg Numerical simulation studies  (1)
  • aplysin  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The rearrangement of some cyclopentanone-aryloximes: synthesis of (+/-)-aplysin, (+/-)-filiformin and of their debromo analogues.
    Amsterdam : Elsevier
    Tetrahedron 47 (1991), S. 10003-10014 
    Details
    ISSN: 0040-4020
    Keywords: Sesquiterpene ; aplysin ; cyclopentanodihydrobenzofuranes ; diastereoselective equilibration-alkylation of a lactol. ; filiformin ; rearrangement of aryloximes
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4020(01)96049-1
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    MR phase imaging and cerebrospinal fluid flow in the head and spine (1990)
    Springer
    Neuroradiology 32 (1990), S. 399-406 
    Details
    ISSN: 1432-1920
    Keywords: MRI ; Phase imaging ; CSF flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Motion of the cerebrospinal fluid (CSF) in and around the brain and spinal cord was examined in healthy subjects and in a number of patients with abnormalities of the CSF circulation. The pulsatile motion of the CSF was determined by spin echo phase (velocity) imaging, sometimes in combination with gradient echo phase contrast cine. Differences in flow patterns across CSF spaces were observed: flow reversal in the cerebellomedullary cistern and lumbar area relative to cervical CSF, and in the posterior versus the anterior subarachnoid space in the spinal canal. Flow communication was demonstrated in known communicating cysts or cavities. Differences in flow were also noted across spinal narrowing or block, and across the walls of a variety of cystic lesions in the brain and spinal cord. MR phase imaging of CSF flow provides pathophysiological information of potential clinical importance for the assessment of diseases affecting the CSF circulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588473
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of the spin-1/2 antiferromagnetic ladder under magnetic field (1999)
    Springer
    The European physical journal 7 (1999), S. 171-174 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.27.+a Strongly correlated electron systems; heavy fermions - 75.40.Mg Numerical simulation studies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Specific heat (CV) measurements in the spin-1/2 Cu2(C2H12N2)2Cl4 system under a magnetic field up to H =8.25 T are reported and compared to the results of numerical calculations based on the 2-leg antiferromagnetic Heisenberg ladder. While the temperature dependences of both the susceptibility and the low-field specific heat are accurately reproduced by this model, deviations are observed above the critical field HC1 at which the spin gap closes. In this Quantum High Field phase, the contribution of the low-energy quantum fluctuations are stronger than in the Heisenberg ladder model. We argue that this enhancement can be attributed to dynamical lattice fluctuations. Finally, we show that such a Heisenberg ladder, for H 〉 H C1, is unstable, when coupled to the 3D lattice, against a lattice distortion. These results provide an alternative explanation for the observed low temperature ( K-0.8 K) phase (previously interpreted as a 3D magnetic ordering) as a new type of incommensurate gapped state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050600
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    Paper (German National Licenses)
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