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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.49  No.4 (2008)  >  pp.874-878

MATERIALS TRANSACTIONS
<<Previous article Vol.49  No.4 (2008)   pp.874 - 878 Next article>>

Laser Raman Spectroscopic Study on Magnetite Formation in Magnetotactic Bacteria

Shingo Watanabe1), Masaharu Yamanaka1), Akira Sakai2), Ken Sawada1) and Tatsuo Iwasa1)
1) Department of Materials Science and Engineering, Muroran Institute of Technology
2) Department of Electrical and Electronic Engineering, Muroran Institute of Technology


Magnetotactic bacteria have one or more chains of magnetosome, consisting of nano-sized magnetic crystal covered with a phospholipid bilayer and use it to sense the geomagnetic fields. In order to elucidate the molecular process to make magnetosome from the iron compounds found in the bacteria, laser Raman spectroscopic measurements were performed with the magnetotactic bacterium, Magnetospirillum magnetotacticum MS-1 and the fractions separated from it. The major Raman signals at 662 cm−1 and 740 cm−1 were observed. The former was assigned to the Raman signal of magnetite and the latter, to that of ferrihydrite. The Raman signal of ferrihydrite was observed not only in the membrane fraction, but also in the cytoplasmic fraction. Based on the results, the role of ferrihydrite in magnetosome synthesis in the magnetotactic bacteria was discussed.


Keyword:
laser Raman microscopy, magnetite, ferrihydrite, magnetotactic bacteria

Received: December 20, 2007
Accepted: February 12, 2008 , Published online: March 25, 2008
Copyright (c) 2008 The Japan Institute of Metals

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