Magnetic properties of uncultivated magnetotactic bacteria and their contribution to a stratified estuary iron cycle

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dc.contributor.authorChen, APen_AU
dc.contributor.authorBerounsky, VMen_AU
dc.contributor.authorChan, MKen_AU
dc.contributor.authorBlackford, MGen_AU
dc.contributor.authorCady, Cen_AU
dc.contributor.authorMoskowitz, BMen_AU
dc.contributor.authorKraal, Pen_AU
dc.contributor.authorLima, EAen_AU
dc.contributor.authorKopp, REen_AU
dc.contributor.authorLumpkin, GRen_AU
dc.contributor.authorWeiss, BPen_AU
dc.contributor.authorHesse, PPen_AU
dc.contributor.authorVella, NGFen_AU
dc.date.accessioned2016-06-22T06:33:16Zen_AU
dc.date.available2016-06-22T06:33:16Zen_AU
dc.date.issued2014-09-01en_AU
dc.date.statistics2016-06-22en_AU
dc.description.abstractOf the two nanocrystal (magnetosome) compositions biosynthesized by magnetotactic bacteria (MTB), the magnetic properties of magnetite magnetosomes have been extensively studied using widely available cultures, while those of greigite magnetosomes remain poorly known. Here we have collected uncultivated magnetite- and greigite-producing MTB to determine their magnetic coercivity distribution and ferromagnetic resonance (FMR) spectra and to assess the MTB-associated iron flux. We find that compared with magnetite-producing MTB cultures, FMR spectra of uncultivated MTB are characterized by a wider empirical parameter range, thus complicating the use of FMR for fossilized magnetosome (magnetofossil) detection. Furthermore, in stark contrast to putative Neogene greigite magnetofossil records, the coercivity distributions for greigite-producing MTB are fundamentally left-skewed with a lower median. Lastly, a comparison between the MTB-associated iron flux in the investigated estuary and the pyritic-Fe flux in the Black Sea suggests MTB play an important, but heretofore overlooked role in euxinic marine system iron cycle.© 2014, Nature Publishing Group.en_AU
dc.identifier.articlenumber4797en_AU
dc.identifier.citationChen, A. P., Berounsky, V. M., Chan, M. K., Blackford, M. G., Cady, C., Moskowitz, B. M., Kraal, P., Lima, E. A., Kopp, R. E., Lumpkin, G. R., Weiss, B. P., Hesse, P., Vella, N. G. F. (2014). Magnetic properties of uncultivated magnetotactic bacteria and their contribution to a stratified estuary iron cycle. Nature Communications, 5. doi:10.1038/ncomms5797en_AU
dc.identifier.govdoc6738en_AU
dc.identifier.issn2041-1723en_AU
dc.identifier.journaltitleNature Communicationsen_AU
dc.identifier.urihttp://dx.doi.org/10.1038/ncomms5797en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/7059en_AU
dc.identifier.volume5en_AU
dc.language.isoenen_AU
dc.publisherNature Publishing Groupen_AU
dc.subjectMagnetiteen_AU
dc.subjectBacteriaen_AU
dc.subjectFerromagnetic resonanceen_AU
dc.subjectFossilsen_AU
dc.subjectNanocrystalsen_AU
dc.subjectAquatic ecosystemsen_AU
dc.subjectBlack Seaen_AU
dc.titleMagnetic properties of uncultivated magnetotactic bacteria and their contribution to a stratified estuary iron cycleen_AU
dc.typeJournal Articleen_AU
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