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ID 15348
file
creator
Tomishige, Masahiko
Itoh, Yasuhiro
Shibata, Naho
Kosaka, Toshikazu
Hosoya, Hiroshi
Tanimoto, Yoshifumi
subject
Strong Magnetic Field
Swimming Behavior
Paramecium caudatum
Protists, Susceptibility Anisotropy
Magnetic Orientation
NDC
Biology
abstract
Effect of horizontal strong static magnetic field on swimming behavior of Paramecium caudatum was studied by using a superconducting magnet. Around a center of a round vessel, random swimming at 0 T and aligned swimming parallel to the magnetic field (MF) of 8 T were observed. Near a wall of the vessel, however, swimming round and round along the wall at 0 T and aligned swimming of turning at right angles upon collision with the wall, which was remarkable around 1~4 T, were detected. It was experimentally revealed that the former MF-induced parallel swimming at the vessel center was caused physicochemically by the parallel magnetic orientation of the cell itself. From magnetic field dependence of the extent of the orientation, the magnetic susceptibility anisotropy (χ‖-χ⊥) was first obtained to be 3.4×10-23 emu cell-1 at 298 K for Paramecium caudatum. The orientation of the cell was considered to result from the magnetic orientation of the cell membrane. On the other hand, although mechanisms of the latter swimming near the vessel wall regardless of the absence and presence of the magnetic field are unclear at present, these experimental results indicate that whether the cell exists near the wall alters magnetic field effect on the swimming in the horizontal magnetic field.
journal title
Molecular Physics
volume
Volume 104
issue
Issue 10-11
start page
1659
end page
1666
date of issued
2006-05-20
publisher
Taylar & Francis
date of created
2006-05-20
issn
0026-8976
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2006 Taylar & Francis. This is an electronic version of an article published in "Molecular Physics Vol.104 No.10-11 pp.1659-1666" Molecular Physics is available at: http://dx.doi.org/10.1080/00268970600643556
relation is version of URL
http://dx.doi.org/10.1080/00268970600643556
department
Graduate School of Science



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