Laser Raman Spectroscopic Study on Magnetite Formation in Magnetotactic Bacteria

Watanabe, Satoshi; Yamanaka, Masaharu; Sakai, Akira; Sawada, Ken; Iwasa, Takeshi

doi:10.2320/matertrans.mer2007333

Cited by 14 publications

(11 citation statements)

References 30 publications

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“…25) This result conforms to the Raman spectrum for the MS fraction as measured by Watanabe et al 17) In the Raman spectroscopy, 17) peaks of ferrihydrite have been reported for the CP and MM fractions. Likewise, we found that the FMR spectra for the CP and MM fractions were similar line shapes.…”

Section: Comparison Of Fmr and Raman Spectrasupporting

confidence: 73%

“…However, its Raman spectrum was found to have a poor signal-to-noise ratio. 17) This suggests that unknown iron compounds may exist in the CD fraction.…”

Section: Comparison Of Fmr and Raman Spectramentioning

confidence: 99%

“…1,14) While many studies focused on the characterization of the proteins, little research on the process of formation of magnetites crystals has been carried out. [15][16][17] Frankel et al detected ferrihydrite (5Fe 2 O 3 Á9H 2 O) from M. magnetotacticum MS-1 using Mössbauer spectroscopy. They concluded that magnetite was formed via the partial reduction of ferrihydrite.…”

Section: )mentioning

confidence: 99%

“…17) In E. Coli, the major iron compound is a ferrous ion binding compound that consists of a phospholylated sugar derivative. 28) This compound binds approximately 40% of cytoplasmic irons and can be considered an iron pool.…”

Section: Iron Compounds In Cells Of M Magnetotacticummentioning

confidence: 99%

“…Each cell fraction and the WC were lyophilized and subjected to EPR measurement. The culture conditions of M. magnetotacticum MS-1 and the preparation method were previously described by Watanabe et al 17) Each cell fraction was well separated and purified to prevent mutual contamination.…”

Section: Sample Preparationmentioning

confidence: 99%

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A Ferromagnetic Resonance Study of Iron Complexes as Biologically Synthesized in Magnetic Bacteria

et al. 2009

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In order to analyze the magnetic behaviors of iron complexes biologically synthesized in magnetic bacteria MS-1, we performed FMR (Ferromagnetic Resonance) measurements for each fraction of the cell. We observed FMR spectra from the ferric iron (Fe 3þ ) compounds distributed in each fraction of the MS-1 cell. In particular, the magnetosome fraction yielded an anisotropic FMR signal, whereas other fractions were simple FMR spectra of a Gaussian type.Upon counting the numbers of spins in various cell fractions, we compared them with the iron population as determined by the 1.10-phenanthroline method. We found a good correlation between the number of spins and the iron population in several cell fractions. We concluded that the cell fractions, other than those fractions containing magnetite, consist mostly of ferric irons rather than ferrous irons.

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Section: Comparison Of Fmr and Raman Spectrasupporting

confidence: 73%

“…However, its Raman spectrum was found to have a poor signal-to-noise ratio. 17) This suggests that unknown iron compounds may exist in the CD fraction.…”

Section: Comparison Of Fmr and Raman Spectramentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: Iron Compounds In Cells Of M Magnetotacticummentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

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A Ferromagnetic Resonance Study of Iron Complexes as Biologically Synthesized in Magnetic Bacteria

et al. 2009

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Phase Transformations and Structural Developments in the Radular Teeth of Cryptochiton Stelleri

Wang

Nemoto

et al. 2013

Adv Funct Materials

105

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During mineralization, the hard outer magnetite‐containing shell of the radular teeth of Cryptochiton stelleri undergoes four distinct stages of structural and phase transformations: (i) the formation of a crystalline α‐chitin organic matrix that forms the structural framework of the non‐mineralized teeth, (ii) the templated synthesis of ferrihydrite crystal aggregates along these organic fibers, (iii) subsequent solid state phase transformation from ferrihydrite to magnetite, and (iv) progressive magnetite crystal growth to form continuous parallel rods within the mature teeth. The underlying α‐chitin organic matrix appears to influence magnetite crystal aggregate density and the diameter and curvature of the resulting rods, both of which likely play critical roles in determining the local mechanical properties of the mature radular teeth.

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Bioinspired Magnetite Crystallization Directed by Random Copolypeptides

Lenders

Zope

Yamagishi

et al. 2014

Adv Funct Materials

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publicationCitation for published version (APA): Lenders, J. J. M., Zope, H., Yamagishi, A., Bomans, P. H. H., Arakaki, A., Kros, A., ... Sommerdijk, N. A. J. M. (2015). Bioinspired magnetite crystallization directed by random copolypeptides. Advanced Functional Materials, 25(5), 711-719. DOI: 10.1002711-719. DOI: 10. /adfm.201403585, 10.1002 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. often single-domain crystals as, e.g., encountered in the magnetosomes of magnetotactic bacteria, [ 4 ] but also in the magnetoreceptive organs of migratory birds, [ 5 ] honeybees, [ 5a , 6 ] and certain fi sh. [ 5a , 7 ] In contrast, the most commonly used industrial process for magnetite production up to date, direct coprecipitation of Fe (II) and Fe (III) ions from solution, typically yields small (<20 nm) superparamagnetic particles with little control over size or shape, [ 8 ] while protocols allowing better control usually involve non-aqueous media and/or high temperatures. [ 8d,e ] Applying strategies from biomineralization in materials chemistry could open the door to the additive-directed synthesis of magnetite-based nanomaterials with control over the dimensions and organization of the particles and thereby their magnetic properties, using green, bioinspired production methods, i.e., using aqueous media and ambient temperatures. [ 3a , 9 ] However, compared to other biominerals (e.g., calcium carbonate, calcium phosphate, and silica), for which the biomimetic synthesis of materials with controlled morphology through the action of d...

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Laser Raman Spectroscopic Study on Magnetite Formation in Magnetotactic Bacteria

Cited by 14 publications

References 30 publications

A Ferromagnetic Resonance Study of Iron Complexes as Biologically Synthesized in Magnetic Bacteria

A Ferromagnetic Resonance Study of Iron Complexes as Biologically Synthesized in Magnetic Bacteria

Phase Transformations and Structural Developments in the Radular Teeth of Cryptochiton Stelleri

Bioinspired Magnetite Crystallization Directed by Random Copolypeptides

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