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  • 1
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    Manganese incorporation into the magnetosome magnetite: magnetic signature of doping (2014)
    Schweizerbart
    Details
    Publication Date: 2014-08-22
    Description: The biomineralization of magnetotactic bacterial magnetite nanoparticles is a topic of intense research due to the particles’ narrow size distribution and magnetic properties. Incorporation of foreign metal ions into the crystal matrix of magnetotactic bacterial magnetite has been previously examined by a number of investigators. In this study, cells of a magnetotactic bacterium, Magnetospirillum gryphiswaldense strain MSR-1 were grown in the presence of manganese, ruthenium, zinc and vanadium, of which only manganese was incorporated within the magnetosome magnetite crystals. We demonstrate that the magnetic properties of magnetite crystals of magnetotactic bacteria can be significantly altered by the incorporation of metal ions, other than iron, in the crystal structure. The Verwey transition serves as a unique marker to probe the incorporation of the dopant within the magnetosome: manganese incorporation into the magnetite nanocrystals is signaled by a suppression of the Verwey transition, as well as by changes in the crystalline structure and chemical composition of magnetosome magnetite.
    Print ISSN: 0935-1221
    Electronic ISSN: 1617-4011
    Topics: Geosciences
    Published by Schweizerbart
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  • 2
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    Oxygen and iron isotope studies of magnetite produced by magnetotactic bacteria (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-09-18
    Description: A series of carefully controlled laboratory studies was carried out to investigate oxygen and iron isotope fractionation during the intracellular production of magnetite (Fe(3)O(4)) by two different species of magnetotactic bacteria at temperatures between 4 degrees and 35 degrees C under microaerobic and anaerobic conditions. No detectable fractionation of iron isotopes in the bacterial magnetites was observed. However, oxygen isotope measurements indicated a temperature-dependent fractionation for Fe(3)O(4) and water that is consistent with that observed for Fe(3)O(4) produced extracellularly by thermophilic Fe(3+)-reducing bacteria. These results contrast with established fractionation curves estimated from either high-temperature experiments or theoretical calculations. With the fractionation curve established in this report, oxygen-18 isotope values of bacterial Fe(3)O(4) may be useful in paleoenvironmental studies for determining the oxygen-18 isotope values of formation waters and for inferring paleotemperatures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mandernack -- Bazylinski -- Shanks 3rd -- Bullen -- New York, N.Y. -- Science. 1999 Sep 17;285(5435):1892-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO 80401, USA. Department of Microbiology, Iowa State University, Ames, IA 50011, USA. U.S. Geological Survey, 973 Denver Federal Center, Denver, CO 80225, USA. Water R.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10489363" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Magnetic microstructure of magnetotactic bacteria by electron holography (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-12-04
    Description: Off-axis electron holography in the transmission electron microscope was used to correlate the physical and magnetic microstructure of magnetite nanocrystals in magnetotactic bacteria. The magnetite crystals were all single magnetic domains, and the magnetization directions of small superparamagnetic crystals were constrained by magnetic interactions with larger crystals in the chains. Shape anisotropy was found to dominate magnetocrystalline anisotropy in elongated crystals. A coercive field between 300 and 450 oersted was determined for one chain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dunin-Borkowski -- McCartney -- Frankel -- Bazylinski -- Posfai -- Buseck -- New York, N.Y. -- Science. 1998 Dec 4;282(5395):1868-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉R. E. Dunin-Borkowski and M. R. McCartney, Center for Solid State Science, Arizona State University, Tempe, AZ 85287-1704, USA. R. B. Frankel, Department of Physics, California Polytechnic State University, San Luis Obispo, CA 93407, USA. D.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9836632" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Reaction sequence of iron sulfide minerals in bacteria and their use as biomarkers (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-05-23
    Description: Some bacteria form intracellular nanometer-scale crystals of greigite (Fe3S4) that cause the bacteria to be oriented in magnetic fields. Transmission electron microscope observations showed that ferrimagnetic greigite in these bacteria forms from nonmagnetic mackinawite (tetragonal FeS) and possibly from cubic FeS. These precursors apparently transform into greigite by rearrangement of iron atoms over a period of days to weeks. Neither pyrrhotite nor pyrite was found. These results have implications for the interpretation of the presence of pyrrhotite and greigite in the martian meteorite ALH84001.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Posfai, M -- Buseck, P R -- Bazylinski, D A -- Frankel, R B -- New York, N.Y. -- Science. 1998 May 8;280(5365):880-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology, Arizona State University, Tempe, AZ 85287, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9572727" target="_blank"〉PubMed〈/a〉
    Keywords: Bacteria/*chemistry/metabolism/ultrastructure ; Biomarkers/analysis ; Crystallization ; Ferrous Compounds/*analysis/chemistry/metabolism ; Iron/*analysis/chemistry/metabolism ; *Magnetics ; Mars ; Meteoroids ; Sulfides/*analysis/chemistry/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    South-seeking magnetotactic bacteria in the Northern Hemisphere (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-21
    Description: Magnetotactic bacteria contain membrane-bound intracellular iron crystals (magnetosomes) and respond to magnetic fields. Polar magnetotactic bacteria in vertical chemical gradients are thought to respond to high oxygen levels by swimming downward into areas with low or no oxygen (toward geomagnetic north in the Northern Hemisphere and geomagnetic south in the Southern Hemisphere). We identified populations of polar magnetotactic bacteria in the Northern Hemisphere that respond to high oxygen levels by swimming toward geomagnetic south, the opposite of all previously reported magnetotactic behavior. The percentage of magnetotactic bacteria with south polarity in the environment is positively correlated with higher redox potential. The coexistence of magnetotactic bacteria with opposing polarities in the same redox environment conflicts with current models of the adaptive value of magnetotaxis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simmons, Sheri L -- Bazylinski, Dennis A -- Edwards, Katrina J -- New York, N.Y. -- Science. 2006 Jan 20;311(5759):371-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Massachusetts Institute of Technology-Woods Hole Oceanographic Institution (MIT-WHOI) Joint Program in Oceanography, Department of Marine Chemistry and Geochemistry, MS 52, WHOI, Woods Hole, MA 02543, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16424338" target="_blank"〉PubMed〈/a〉
    Keywords: Colony Count, Microbial ; DNA, Bacterial/chemistry/genetics ; DNA, Ribosomal/chemistry/genetics ; Deltaproteobacteria/classification/cytology/isolation & purification/*physiology ; Geography ; In Situ Hybridization ; *Magnetics ; Molecular Sequence Data ; Movement ; Oxidation-Reduction ; Oxygen ; Water/chemistry ; *Water Microbiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Multiple evolutionary origins of magnetotaxis in bacteria (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-02-05
    Description: Magnetosomes are intracellular, iron-rich, membrane-enclosed magnetic particles that allow magnetotactic bacteria to orient in the earth's geomagnetic field as they swim. The magnetosomes of most magnetotactic bacteria contain iron oxide particles, but some magnetotactic species contain iron sulfide particles instead. Phylogenetic analyses of small subunit ribosomal RNA sequences showed that all known magnetotactic bacteria of the iron oxide type are associated with the a subgroup of the Proteobacteria in the domain Bacteria. In contrast, uncultured magnetotactic bacteria of the iron sulfide type are specifically related to the dissimilatory sulfate-reducing bacteria within the delta subdivision of the Proteobacteria. These findings indicate a polyphyletic origin for magnetotactic bacteria and suggest that magnetotaxis based on iron oxides and iron sulfides evolved independently.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Delong, E F -- Frankel, R B -- Bazylinski, D A -- New York, N.Y. -- Science. 1993 Feb 5;259(5096):803-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17809345" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    A cultured greigite-producing magnetotactic bacterium in a novel group of sulfate-reducing bacteria (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-12-24
    Description: Magnetotactic bacteria contain magnetosomes--intracellular, membrane-bounded, magnetic nanocrystals of magnetite (Fe(3)O(4)) or greigite (Fe(3)S(4))--that cause the bacteria to swim along geomagnetic field lines. We isolated a greigite-producing magnetotactic bacterium from a brackish spring in Death Valley National Park, California, USA, strain BW-1, that is able to biomineralize greigite and magnetite depending on culture conditions. A phylogenetic comparison of BW-1 and similar uncultured greigite- and/or magnetite-producing magnetotactic bacteria from freshwater to hypersaline habitats shows that these organisms represent a previously unknown group of sulfate-reducing bacteria in the Deltaproteobacteria. Genomic analysis of BW-1 reveals the presence of two different magnetosome gene clusters, suggesting that one may be responsible for greigite biomineralization and the other for magnetite.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lefevre, Christopher T -- Menguy, Nicolas -- Abreu, Fernanda -- Lins, Ulysses -- Posfai, Mihaly -- Prozorov, Tanya -- Pignol, David -- Frankel, Richard B -- Bazylinski, Dennis A -- New York, N.Y. -- Science. 2011 Dec 23;334(6063):1720-3. doi: 10.1126/science.1212596.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire de Bioenergetique Cellulaire, UMR 6191, Commissariat a l'Energie Atomique Cadarache, Direction des Sciences du Vivant, Institut de Biologie Environnementale et Biotechnologie, Saint-Paul-lez-Durance, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22194580" target="_blank"〉PubMed〈/a〉
    Keywords: California ; Crystallization ; Culture Media ; Deltaproteobacteria/classification/genetics/*isolation & purification/metabolism ; Ecosystem ; Ferrosoferric Oxide/analysis/metabolism ; Fresh Water/microbiology ; Genes, rRNA ; Genome, Bacterial ; Geologic Sediments/microbiology ; Iron/analysis/*metabolism ; *Magnetic Phenomena ; Magnetosomes/*chemistry ; Natural Springs/*microbiology ; Oxidation-Reduction ; Phylogeny ; RNA, Ribosomal, 16S/genetics ; Salinity ; Sulfates/*metabolism ; Sulfides/analysis/*metabolism ; *Water Microbiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic force microscopy of the submicron magnetic assembly in a magnetotactic bacterium (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2582-2584 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A magnetic force microscope (MFM) was used to image topography and magnetic forces from a chain of submicron single magnetic domain particles produced by and contained in isolated magnetotactic bacteria. The noncontact magnetic force microscope data were used to determine a value for the magnetic moment of an individual bacterial cell, of order 10−13 emu, consistent with the average magnetic moment of bacteria from the same sample, obtained by superconducting quantum interference device magnetometry. The results represent the most sensitive quantification of a magnetic force microscope image to date. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113508
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  • 9
    Electronic Resource
    Electronic Resource
    Controlled biosynthesis of greigite (Fe3S4) in magnetotactic bacteria (1990)
    Springer
    Naturwissenschaften 77 (1990), S. 536-538 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01139266
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  • 10
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    Truncated hexa-octahedral magnetite crystals in ALH84001: Presumptive biosignatures (2001)
    National Academy of Sciences
    Details
    Publication Date: 2001-02-27
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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