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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Fingerprints of partial oxidation of biogenic magnetite from cultivated and natural marine magnetotactic bacteria using synchrotron radiation

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Author(s):
Rodelli, D. [1] ; Jovane, L. [1] ; Roberts, A. P. [2] ; Cypriano, J. [3] ; Abreu, F. [3] ; Lins, U. [3]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Oceanog, BR-05508120 Sao Paulo - Brazil
[2] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601 - Australia
[3] Unv Fed Rio de Janeiro, Inst Microbiol Paulo de Goes, BR-21941902 Rio De Janeiro - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ENVIRONMENTAL MICROBIOLOGY REPORTS; v. 10, n. 3, p. 337-343, JUN 2018.
Web of Science Citations: 4
Abstract

Magnetotactic bacteria are a multi-phyletic group of bacteria that synthesize membrane-bound magnetic minerals. Understanding the preservation of these minerals in various environments (e.g., with varying oxygen concentrations and iron supply) is important for understanding their role as carriers of primary magnetizations in sediments and sedimentary rocks. Here we present X-ray near edge structure (XANES) spectra for Fe in magnetotactic bacteria samples from recent sediments to assess surface oxidation and crystal structure changes in bacterial magnetite during early burial. Our results are compared with a XANES spectrum of cultivated Magnetofaba australis samples, and with magnetic properties, and indicate that oxidation of magnetite to maghemite increases with depth in the sediment due to longer exposure tomolecular oxygen. These results are relevant tounderstanding magnetic signatures carried by magnetofossils in oxic sediments and sedimentary rocks of different ages. (AU)

FAPESP's process: 11/22018-3 - Primary productivity in oceans studying magnetotactic bacteria in sediments
Grantee:Luigi Jovane
Support Opportunities: Research Program on Global Climate Change - Young Investigators
FAPESP's process: 12/21212-3 - Unravel middle Eocene-Oligocene paleoclimate and paleoceanography using paleomagnetism
Grantee:Daniel Rodelli
Support Opportunities: Scholarships in Brazil - Doctorate