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  • 1995-1999
  • 1990-1994  (3)
  • 1993  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Excitation of the modified Simon–Hoh instability in an electron beam produced plasma (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1681-1694 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An intermediate frequency (fci≤f≤fce) electrostatic instability has been observed in an electron beam produced, cylindrical plasma column. This instability has been identified as a new instability, the modified Simon–Hoh instability (MSHI), which has an instability mechanism similar to the Simon–Hoh instability (SHI). This instability can occur in a cylindrical collisionless plasma if a radial dc electric field exists and if this radial dc electric field and the radial density gradient are in the same direction. The origin of the dc electric field is found to be the difference between the ion and the electron radial density profiles. In such a plasma if the ions are essentially unmagnetized but the electrons are magnetized, a velocity difference in the θ direction can arise because of the finite ion Larmor radius effect. This leads to a space charge separation between the electron and ion density perturbations in the θ direction. The consequent perturbed azimuthal electric field Eθ1 and the enhancement of the density perturbation by the Eθ1×B0 velocity occur in the same manner as in the SHI. The instability frequency is decided by the ion azimuthal drift velocity. This new instability has been investigated through experiments and theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860803
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of dietary iron deficiency on acute metal intoxication (1993)
    Springer
    BioMetals 6 (1993), S. 133-138 
    Details
    ISSN: 1572-8773
    Keywords: biochemical alterations ; cadmium ; dietary iron deficiency ; lead ; metallothionein ; metals ; nickel ; rat ; tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The influence of dietary iron deficiency on acute nickel, lead or cadmium toxicity as reflected by the induction of hepatic, renal and intestinal metallothionein (MT), disposition of the metals, and alterations in hematological parameters was investigated in rats. The administration of cadmium induced the hepatic, renal and intestinal MT while that of nickel or lead induced hepatic MT only. However, dietary iron deficiency did not influence the cadmium induced tissue MT but enhanced the ability of nickel or lead to restore the normal synthesis of renal and intestinal MT lowered under the influence of reduced body iron status. The accumulation of lead in liver and kidney and that of cadmium enhanced in liver only, while tissue deposition of nickel remained unaffected by iron deficiency. The induction of hepatic MT by three metals appears related to the concomitant rise in the hepatic zinc, calcium and iron levels in normal rats. However, dietary iron deficiency increased the hepatic zinc in response to nickel or cadmium and that of heptic calcium in response to lead.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00140115
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Unusual MRI appearances of cysticercus within the fourth ventricle (1993)
    Springer
    Neuroradiology 35 (1993), S. 457-458 
    Details
    ISSN: 1432-1920
    Keywords: Neurocysticercosis ; Intraventricular granuloma ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report a cysticercus within the fourten ventricle which showed unusual hypointensity on T2-weighted images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602830
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    Paper (German National Licenses)
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