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Characterizing magnetism of individual magnetosomes by X-ray magnetic circular dichroism in a scanning transmission X-ray microscope

Title data

Lam, Karen P. ; Hitchcock, Adam P. ; Obst, Martin ; Lawrence, John R. ; Swerhone, George D. W. ; Leppard, Gary G. ; Tyliszczak, Tolek ; Karunakaran, Chithra ; Wang, Jian ; Kaznatcheev, Konstantin V. ; Bazylinski, Dennis A. ; Lins, Ulysses:
Characterizing magnetism of individual magnetosomes by X-ray magnetic circular dichroism in a scanning transmission X-ray microscope.
In: Chemical Geology. Vol. 270 (2010) Issue 1-4 . - pp. 110-116.
ISSN 0009-2541
DOI: https://doi.org/10.1016/j.chemgeo.2009.11.009

Abstract in another language

Soft X-ray scanning transmission X-ray microscopy (STXM) was used to measure the Fe L2, 3 X-ray magnetic circular dichroism (XMCD) signal from individual, 30 nm diameter magnetosomes in a magnetotactic bacterium, specifically the marine vibrio strain MV-1. The Fe L2, 3 spectra recorded with circularly polarized X-rays from an elliptically polarizing undulator were very similar in shape and magnitude to those of fully saturated magnetite (Fe3O4). As previously determined by other techniques, our results show that the magnetic moments of individual magnetosomes arranged in linear chains in intact cells of strain MV-1 are all oriented in the same direction. The magnitude of the XMCD signal averaged over a chain of 9 magnetosomes in one cell is similar to that of single crystal magnetite. The spectral shape is slightly different, and indicates that magnetosomes have excess Fe(II), as noted in previous bulk studies of biogenic magnetite. To our knowledge, this is the first measurement of the XMCD of individual magnetosomes in magnetotactic bacteria.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER135536
Keywords: X-ray magnetic circular dichroism; XMCD; Scanning Transmission X-Ray; Microscopy; STXM; Magnetotactic bacteria; Magnetosomes; Magnetite; Fe3O4; Marine vibrio; Strain MV-1
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Heisenberg Professorship - Experimental Biogeochemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Heisenberg Professorship - Experimental Biogeochemistry > Heisenberg Professorship - Experimental Biogeochemistry - Univ.-Prof. Dr. Martin Obst
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: No
DDC Subjects: 500 Science
500 Science > 550 Earth sciences, geology
Date Deposited: 13 Aug 2020 11:56
Last Modified: 15 Sep 2020 08:53
URI: https://eref.uni-bayreuth.de/id/eprint/56486