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Minerals 2014, 4(3), 565-577; doi:10.3390/min4030565

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

1
Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
2
Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), Okayama 700-8530, Japan
*
Author to whom correspondence should be addressed.
Received: 11 April 2014 / Revised: 3 June 2014 / Accepted: 23 June 2014 / Published: 27 June 2014
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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. View Full-Text
Keywords: Leptothrix sp. strain OUMS1; sheath formation; iron oxide; silicon-rich sheath; phase change of iron oxides Leptothrix sp. strain OUMS1; sheath formation; iron oxide; silicon-rich sheath; phase change of iron oxides
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MDPI and ACS Style

Ishihara, H.; Hashimoto, H.; Taketa, E.; Suzuki, T.; Mandai, K.; Kunoh, H.; Takada, J. Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture. Minerals 2014, 4, 565-577.

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