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1994 (1)
1978 (1)
1Author    Stephan Bamberger, Günter Valet, Friedrich Storch, Gerhard Ruhenstroth-BauerRequires cookie*
 Title    Electromagnetically Induced Fluid Streaming as a Possible Mechanism of the Biomagnetic Orien­ tation of Organisms  
 Abstract    The results show that both the direction and the intensity of the geomagnetic field can be sensed within the chamber of a Zeiss Cytopherometer. This suggests that electro­ magnetically induced fluid streaming might play a role in the perception of the geomagnetic field by organisms, although it is not clear at present in which organ the per­ ception occurs. A basic requirement for such an organ would be an anisotropy of cells or cellular structures. The nervous system with its parallel axons, or specific cells associated with the nervous system, could thus be possible locations of the sensitivity towards magnetic fields. 
  Reference    Z. Naturforsch. 33c, 159—160 (1978); received November 24 1977 
  Published    1978 
  Keywords    Electric Field, Magnetic Earth Field, Suspended Particle, Magnetic, Sensitivity, Organism 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0159_n.pdf 
 Identifier    ZNC-1978-33c-0159_n 
 Volume    33 
2Author    R. K. Sanghvi, R. K. ChhajlaniRequires cookie*
 Title    Hydromagnetic Kelvin-Heimholtz Instability in the Presence of Suspended Particles and Finite Larmor Radius Effect  
 Abstract    A linear analysis o f the com bined influence of a finite ion Larmor radius and suspended particles on K elvin-H elm holtz instability in the presence of a uniform magnetic field is carried out. The magnetic field is assumed to be uniform and transverse to the direction of streaming. The medium is assumed to be incompressible. Certain simplifying assumptions are made for the m otion of the suspended particles. A dispersion relation for such a medium has been obtained using appropriate boundary conditions. The stabilizing effect of a finite Larmor radius has been reasserted in the absence of the suspended particles. A stability criterion for the medium is derived, which is found to be independent o f the presence of the suspended particles. Similarly a condition of instability of the system is also derived. Num erical analysis is presented in a few limiting cases of interest. Furthermore, growth rates of unstable modes of the configuration with increasing relaxation fre­ quency of the particles and finite Larmor radius have been evaluated analytically. It is shown that the finite Larmor radius in the presence o f the suspended particles destabilizes a certain wave number band which is stable otherwise. Implications of the suspended particles on the growth rate of unstable modes are discussed in the limit of vanishing ion Larmor radius. 
  Reference    Z. Naturforsch. 49a, 1102 (1994); received September 28 1994 
  Published    1994 
  Keywords    Plasma instability, M agnetohydrodynam ic instability, Suspended particles, Kelvin-H elm holtz instability, Finite Larmor radius effect 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1102.pdf 
 Identifier    ZNA-1994-49a-1102 
 Volume    49