Spatially Resolved Distribution of Fe Species around Microbes at the Submicron Scale in Natural Bacteriogenic Iron Oxides

Hiroki Suga; Sakiko Kikuchi; Yasuo Takeichi; Chihiro Miyamoto; Masaaki Miyahara; Satoshi Mitsunobu; Takuji Ohigashi; Kazuhiko Mase; Kanta Ono; Yoshio Takahashi

doi:10.1264/jsme2.ME17009

Short Communications

Spatially Resolved Distribution of Fe Species around Microbes at the Submicron Scale in Natural Bacteriogenic Iron Oxides

Hiroki Suga, Sakiko Kikuchi, Yasuo Takeichi, Chihiro Miyamoto, Masaaki Miyahara, Satoshi Mitsunobu, Takuji Ohigashi, Kazuhiko Mase, Kanta Ono, Yoshio Takahashi

Author information

Hiroki Suga
Department of Earth and Planetary Systems Science, Graduate School of Science (DEPSS), Hiroshima University
Sakiko Kikuchi
Project Team for Development of New-Generation Research Protocol for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Yasuo Takeichi
Institute of Materials Structure Science, High-Energy Accelerator Research Organization (KEK)
Department of Materials Structure Science, SOKENDAI (The Graduate University for Advanced Studies)
Chihiro Miyamoto
Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
Masaaki Miyahara
Department of Earth and Planetary Systems Science, Graduate School of Science (DEPSS), Hiroshima University
Satoshi Mitsunobu
Department of Environmental Conservation, Graduate school of Agriculture, Ehime University
Takuji Ohigashi
UVSOR facility, Institute for Molecular Science
Kazuhiko Mase
Institute of Materials Structure Science, High-Energy Accelerator Research Organization (KEK)
Department of Materials Structure Science, SOKENDAI (The Graduate University for Advanced Studies)
Kanta Ono
Institute of Materials Structure Science, High-Energy Accelerator Research Organization (KEK)
Department of Materials Structure Science, SOKENDAI (The Graduate University for Advanced Studies)
Yoshio Takahashi
Department of Earth and Planetary Systems Science, Graduate School of Science (DEPSS), Hiroshima University
Institute of Materials Structure Science, High-Energy Accelerator Research Organization (KEK)
Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo

Keywords: iron oxides, iron speciation, bacteriogenic/biogenic iron oxides (BIOS), scanning transmission X-ray microscopy (STXM), near edge X-ray absorption fine structure (NEXAFS)

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Supplementary material

2017 Volume 32 Issue 3 Pages 283-287

DOI https://doi.org/10.1264/jsme2.ME17009

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Abstract

Natural bacteriogenic iron oxides (BIOS) were investigated using local-analyzable synchrotron-based scanning transmission X-ray microscopy (STXM) with a submicron-scale resolution. Cell, cell sheath interface (EPS), and sheath in the BIOS were clearly depicted using C-, N-, and O- near edge X-ray absorption fine structure (NEXAFS) obtained through STXM measurements. Fe-NEXAFS obtained from different regions of BIOS indicated that the most dominant iron mineral species was ferrihydrite. Fe(II)- and/or Fe(III)-acidic polysaccharides accompanied ferrihydrite near the cell and EPS regions. Our STXM/NEXAFS analysis showed that Fe species change continuously between the cell, EPS, and sheath under several 10-nm scales.

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