title: Formation of Core-Shell Nanoparticles Composed of Magnetite and Samarium Oxide in Magnetospirillum magneticum Strain RSS-1.
abstract: Magnetotactic bacteria (MTB) synthesize magnetosomes composed of membrane-enveloped magnetite (Fe3O4) or greigite (Fe3S4) particles in the cells. Recently, several studies have shown some possibilities of controlling the biomineralization process and altering the magnetic properties of magnetosomes by adding some transition metals to the culture media under various environmental conditions. Here, we successfully grow Magnetospirillum magneticum strain RSS-1, which are isolated from a freshwater environment, and find that synthesis of magnetosomes are encouraged in RSS-1 in the presence of samarium and that each core magnetic crystal composed of magnetite is covered with a thin layer of samarium oxide (Sm2O3). The present results show some possibilities of magnetic recovery of transition metals and synthesis of some novel structures composed of magnetic particles and transition metals utilizing MTB.
authors.affiliation: Bio-Nano Electronics Research Centre, Toyo University, Kawagoe, Saitama, Japan.
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Shimoshige
authors.affiliation: Bio-Nano Electronics Research Centre, Toyo University, Kawagoe, Saitama, Japan.|Graduate School of Interdisciplinary New Science, Toyo University, Kawagoe, Saitama, Japan.
authors.forename: Yoshikata
authors.initials: Y
authors.lastname: Nakajima
authors.affiliation: Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Kobayashi
authors.affiliation: Bio-Nano Electronics Research Centre, Toyo University, Kawagoe, Saitama, Japan.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Yanagisawa
authors.affiliation: Bio-Nano Electronics Research Centre, Toyo University, Kawagoe, Saitama, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nagaoka
authors.affiliation: Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Shimamura
authors.affiliation: Bio-Nano Electronics Research Centre, Toyo University, Kawagoe, Saitama, Japan.|Graduate School of Interdisciplinary New Science, Toyo University, Kawagoe, Saitama, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Mizuki
authors.affiliation: Bio-Nano Electronics Research Centre, Toyo University, Kawagoe, Saitama, Japan.|Graduate School of Interdisciplinary New Science, Toyo University, Kawagoe, Saitama, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Inoue
authors.affiliation: Bio-Nano Electronics Research Centre, Toyo University, Kawagoe, Saitama, Japan.|Graduate School of Interdisciplinary New Science, Toyo University, Kawagoe, Saitama, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Maekawa
mesh_terms: D052203:Ferrosoferric Oxide / Q000032:analysis*; D055944:Magnetosomes / Q000737:chemistry*; D042201:Magnetospirillum; D053758:Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000032:analysis*; D012493:Samarium / Q000032:analysis*
chemical_list: D010087:Oxides; D012493:Samarium; C120592:samarium oxide; D052203:Ferrosoferric Oxide