Silicon-rich, iron oxide microtubular sheath produced by an iron-oxidizing bacterium, leptothrix sp. strain OUMS1, in culture

Hiromichi Ishihara, Hideki Hashimoto, Eisuke Taketa, Tomoko Suzuki, Kyoko Mandai, Hitoshi Kunoh, Jun Takada

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This study aimed to manipulate the texture and elemental composition of the novel sheaths produced by the iron-oxidizing bacterium Leptothrix in culture by altering components of the medium. When previously isolated strain OUMS1 was cultured in media (pH 7.0 throughout incubation) containing various levels of Si on a rotary shaker at 20 °C and 70 rpm for 14 days, the strain was able to reproduce in media with up to 300 ppm Si, and the hollow microtubular architecture of the sheath was maintained even at 300 ppm Si. The constitutional iron oxide phase changed from poorly crystalline lepidocrocite at 0 ppm Si to X-ray diffraction (XRD)-amorphous 2-line ferrihydrite at 100–300 ppm via their mixture phase with intermediate Si content (Si-30 and -50 ppm). The results strongly indicate that the chemical character and crystallinity of the sheath texture can be regulated by culture conditions, especially components of the medium.

Original languageEnglish
Pages (from-to)565-577
Number of pages13
JournalMinerals
Volume4
Issue number3
DOIs
Publication statusPublished - Jun 27 2014

Keywords

  • Iron oxide
  • Leptothrix sp. strain OUMS1
  • Phase change of iron oxides
  • Sheath formation
  • Silicon-rich sheath

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

Fingerprint Dive into the research topics of 'Silicon-rich, iron oxide microtubular sheath produced by an iron-oxidizing bacterium, leptothrix sp. strain OUMS1, in culture'. Together they form a unique fingerprint.

  • Cite this

    Ishihara, H., Hashimoto, H., Taketa, E., Suzuki, T., Mandai, K., Kunoh, H., & Takada, J. (2014). Silicon-rich, iron oxide microtubular sheath produced by an iron-oxidizing bacterium, leptothrix sp. strain OUMS1, in culture. Minerals, 4(3), 565-577. https://doi.org/10.3390/min4030565