Formation of magnetite in Magnetospirillum gryphiswaldense studied with FORC diagrams

Claire Carvallo; Stanislawa Hickey; Damien Faivre; Nicolas Menguy

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Formation of magnetite in Magnetospirillum gryphiswaldense studied with FORC diagrams

机译：用FORC图研究G.phiswaldense螺旋藻中磁铁矿的形成

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In order to study the formation of magnetite in magnetotactic bacteria, FORC diagrams were measured on a set of cultured Magnetospirillum gryphiswaldense, following an assay in which the iron uptake is used only for magnetite formation and not for cell growth. This enabled us to follow the magnetite formation independently of growth. The FORC diagrams showed a clear evolution from a size-distribution with a majority of superparamagnetic grains, to a distribution dominated by stable, single-domain grains, but still containing some superparamagnetic particles. TEM observations confirm this evolution. According to the saturation isothermal remanent magnetization cooling and warming curves, the Verwey transition can only be seen in the most mature samples, and slightly below 120 K. This suggests that the samples may have suffered from some partial oxidation.

机译：为了研究趋磁细菌中磁铁矿的形成，在其中铁摄取仅用于磁铁矿形成而不用于细胞生长的测定之后，在一组培养的磁链螺线菌上测量了FORC图。这使我们能够独立于生长而追踪磁铁矿的形成。 FORC图显示了从具有大多数超顺磁性晶粒的尺寸分布到由稳定的单畴晶粒为主但仍包含一些超顺磁性粒子的分布的明显演变。 TEM观察证实了这种演变。根据饱和等温剩余磁化冷却和升温曲线，仅在最成熟的样品中（略低于120 K）可以看到Verwey转变。这表明样品可能遭受了部分氧化。

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《Earth, planets and space: EPS》 |2009年第1期|共8页
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Claire Carvallo; Stanislawa Hickey; Damien Faivre; Nicolas Menguy;
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1. Formation of magnetite in Magnetospirillum gryphiswaldense studied with FORC diagrams [J] . Carvallo C, Hickey S, Faivre D, Earth, planets and space: EPS . 2009,第1期

机译：用FORC图研究G.phiswaldense螺旋藻中磁铁矿的形成
2. Magnetospirillum gryphiswaldense Magnetospirillum gryphiswaldense MSR‐1 synthesizes membrane‐enclosed magnetite (Fe 3 3 O 4 4 ) nanoparticles, magnetosomes, for magnetotaxis. Formation of these organelles requires MamB, a cation diffusion facilitator (CDF) protein with two roles: it initiates magnetosome vesicle formation in a transport independent process and transports iron for magnetite nucleation. For details, see the article by Uebe et al et al . on pp. 542–557 of this issue. [J] . Molecular Microbiology . 2018,第4期

机译：Masterospirillum Gryphiswaldense Masterospirillum gryphiswaldense MSR-1合成膜封闭的磁铁矿（Fe 3 3 O 4 4）纳米粒子，磁性分子，用于Magnetotaxis。这些细胞器的形成需要MAMB，阳离子扩散促进剂（CDF）蛋白，其中具有两个作用：它引发了在运输独立的过程中形成的磁体囊泡形成，并将铁用于磁铁矿成核。有关详细信息，请参阅UEBE等人等文章。在第542-557页的本问题。
3. Transport and Magnetite Crystal Formation of the Magnetic Bacterium Magnetospirillum gryphiswaldense [J] . D. Schuler, E. Baeuerlein Journal de Physique, IV: Proceedings of International Conference . 1997,第1期

机译：磁性细菌Magspirospirillum gryphiswaldense的输运和磁铁矿晶体形成
4. Magnetite formation via membrane-bound ferritin and an iron(II) species at the eytoplasmie membrane and in magnetosomes of Magnetospirillum gryphiswaldense [C] . L H Boettger, D Faivre, D Schueler, International conference on applications of the mossbauer effect;ICAME 2009 . 2009

机译：通过质膜结合铁蛋白和铁质（II）质膜在质膜和在磁螺旋藻的磁小体中形成磁铁矿
5. The Effect of Processing Conditions on the Energetic Diagram of CdTe Thin Films Studied by Photoluminescence [D] . Collins, Shamara P. 2018

机译：加工条件对CdTe薄膜光致发光能谱图的影响
6. Bacterioferritin of Magnetospirillum gryphiswaldense Is a Heterotetraeicosameric Complex Composed of Functionally Distinct Subunits but Is Not Involved in Magnetite Biomineralization [O] . René Uebe, Frederik Ahrens, Jörg Stang, 2019

机译：磁螺旋藻的细菌铁蛋白是由功能不同的亚基组成但不参与磁铁矿生物矿化的杂四聚体
7. Formation of magnetite in Magnetospirillum gryphiswaldense studied with FORC diagrams [O] . Claire Carvallo, Stanislawa Hickey, Damien Faivre, 2014

机译：用FORC图研究G.phiswaldense螺旋藻中磁铁矿的形成

Formation of magnetite in Magnetospirillum gryphiswaldense studied with FORC diagrams

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