Journal
CHEMICAL GEOLOGY
Volume 300, Issue -, Pages 14-23Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemgeo.2012.01.005
Keywords
magnetotactic bacteria; magnetosomes; STXM; XMCD; NEXAFS; Fe 2p
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Funding
- NSERC (Canada)
- U.S. National Science Foundation [EAR-0920718]
- Canada Foundation for Innovation (CFI)
- NSERC
- Canadian Institutes of Health Research (CIHR)
- National Research Council (NRC)
- University of Saskatchewan
- Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences Division of the U.S. Department of Energy [DE-AC02-05CH11231]
- Division Of Earth Sciences
- Directorate For Geosciences [0920718] Funding Source: National Science Foundation
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Scanning transmission X-ray microscopy (STXM) measurements at the CK, O K and Fe L-3 edges were used to study the magnetotactic bacterium Candidatus Magnetovibrio blakemorei strain MV-1 on an individual cell basis. Improved data acquisition methodologies resulting in higher quality results are presented. Visualization of magnetosomes from their O K-edge signal is demonstrated. The Fe L-3 X-ray magnetic circular dichroism (XMCD) signal was used to characterize the magnetic properties of several MV-1 cells on an individual magnetosome basis. The absolute magnetic moment from two cells was evaluated and found to be 0.93 (6) of that of saturated abiotic magnetite, or 3.6(2) mu B. Previously observed excess Fe (II) was not found in this study, suggesting the prior observation (Lam et al., Chem. Geol 270 (2010) 110) may have been a radiation damage artifact. (C) 2012 Elsevier B.V. All rights reserved.
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