Characteristics of hollow microtubes consisting of amorphous iron oxide nanoparticles produced by iron oxidizing bacteria, Leptothrix ochracea

Hashimoto, Hideki; Yokoyama, Shinichi; Asaoka, Hiroshi; Kusano, Yoshihiro; Ikeda, Yasunori; Seno, Masaharu; Takada, Jun; Fujii, Toru; Nakanishi, Makoto; Murakami, Ryū

doi:10.1016/j.jmmm.2006.10.793

Cited by 80 publications

(63 citation statements)

References 3 publications

(1 reference statement)

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“…The relatively small standard deviations of average atomic % ( Figure 3B) reflect the uniform distribution of these elements in sheaths. The sheaths produced by OUMS1 in culture were reported to have a mean Si content of less than 20 atomic % [8], similar to those produced by Leptothrix species in natural environments [12,24]. High concentrations of Si in media probably influence secretion of saccharic fibrils in the first step of sheath formation, resulting in thicker fibers, because cell reproduction was similar in Si-0-300, as described earlier.…”

Section: Elemental Analysis and Ratios Of Sheathssupporting

confidence: 68%

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

et al. 2014

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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 . 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.

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Section: Elemental Analysis and Ratios Of Sheathssupporting

confidence: 68%

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

et al. 2014

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“…[1][2][3][4] Bacteria from the Sphaerotilus-Leptothrix group participate in biogeochemical rotation of the iron that occurs in the lithosphere. It is a fundamental geological process of iron oxidation performed by microorganisms 5 where, firstly iron is mobilized, then it is used and assimilated by the microbes and finally it is immobilized and deposited.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Biogenic Iron-Containing Materials

Shopska¹,

Cherkezova‐Zheleva²,

Paneva³

et al. 2014

Croat. Chem. Acta

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Abstract. Biogenic iron oxides could find application in catalysis but their structure and composition should be well characterized. The content of organic rests due to their origin should also be controlled. Samples of natural biomass and biomass obtained after cultivation in Adler's medium of the SphaerotilusLeptothrix group of bacteria were treated by different techniques to reduce or totally remove the organic residues. The aim of the study was to find procedures, which prevent changes in the oxidation state of the iron and of the type of iron-containing compound(s) during treatment. Mössbauer spectroscopy, IRS, DTA, and SEM were used in the study. Chemical treatment with H 2 O 2 or NaOH at room temperature did not significantly change the samples. Thermal treatment in oxidative flow mixture conducted up to 250 °C resulted in a transformation of the iron-containing phases only. The organic matter, which is included in the structure of the particles, cannot easily be affected. DTA revealed that removal of organic rests occurred in the interval of 250-600 °C. However, the transformation of the initial compounds could not be prevented using such a treatment.

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“…It was shown that iron bacteria are widespread in various types of nature waters, which have the capacity of oxidizing and depositing ferrous ions and manganese ions in water efficiently. This microbe could be directly used to obtain composites with a variety of shapes such as fiber, tube and film [7][8][9][10][11][12][13][14][15][16] and has the potential to fabricate the ferrite materials. Compared to traditional chemical synthesis [5], there may be a breakthrough in the aspects of physical control, particle reunion and industrialization.…”

mentioning

confidence: 99%

“…This microbe could be directly used to obtain composites with a variety of shapes such as fiber, tube and film [7][8][9][10][11][12][13][14][15][16] and has the potential to fabricate the ferrite materials. Compared to traditional chemical synthesis [5], there may be a breakthrough in the aspects of physical control, particle reunion and industrialization.In this paper, according to the enrichment and deposition mechanism of iron and manganese [7][8][9][10][11][12], the sediment composition, the microstructure characteristics [15] and other basic research of iron bacteria, the Sphaerotilus natans which were separated from activity mud of Xiamen sewage treatment plant and the Leptothrix discophora which was purchased from ATCC, were used to deposit the iron and manganese ions respectively. The Sediments were collected and heat treated at high temperature to obtain the ferrite.…”

mentioning

confidence: 99%

“…In this paper, according to the enrichment and deposition mechanism of iron and manganese [7][8][9][10][11][12], the sediment composition, the microstructure characteristics [15] and other basic research of iron bacteria, the Sphaerotilus natans which were separated from activity mud of Xiamen sewage treatment plant and the Leptothrix discophora which was purchased from ATCC, were used to deposit the iron and manganese ions respectively. The Sediments were collected and heat treated at high temperature to obtain the ferrite.…”

mentioning

confidence: 99%

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Preparation and properties of ferrite derived from iron oxidizing bacteria

2012

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The growth characteristics of Sphaerotilus natans and Leptothrix discophora SS-1 (ATCC43182) were first used to fabricate the ferrite and manganese ferrite. The scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD), and vibrant sample magnetometer (VSM) were used to make clear their morphology microstructure, chemical composition, crystal structure, and magnetostatic characteristic. The result showed that the hollow ferrite fibers were prepared successfully, whose crystal structures were close to α-Fe 2 O 3 and the average aspect ratio was over 50. Moreover, the soft magnetic manganese ferrite was fabricated with the saturation magnetization Ms at 25 emu/g and coercive force H c at 796 A/m. Biological manufacturing is an emerging cross-disciplinary, which could achieve the efficient and environmentally friendly fabrication of micro/nano functional materials or devices [1,2]. Bio-growth forming is a new method to obtain the required functional materials or products with the direct use of the microbial growth characteristics [1]. For example, the microbe is used to pharmaceutical fermentation, or the magnetotactic bacteria is used to synthesize single domain Fe 3 O 4 [3,4]. Currently, in the areas of materials, the study of magnetic materials represented by ferrite has become a hotspot, and it is widely used in the manufacture of new high-tech products, like electromagnetic absorbing materials, magnetic recording materials, magnetic fluids, catalytic materials, coating or paint [5,6]. It was shown that iron bacteria are widespread in various types of nature waters, which have the capacity of oxidizing and depositing ferrous ions and manganese ions in water efficiently. This microbe could be directly used to obtain composites with a variety of shapes such as fiber, tube and film [7][8][9][10][11][12][13][14][15][16] and has the potential to fabricate the ferrite materials. Compared to traditional chemical synthesis [5], there may be a breakthrough in the aspects of physical control, particle reunion and industrialization.In this paper, according to the enrichment and deposition mechanism of iron and manganese [7][8][9][10][11][12], the sediment composition, the microstructure characteristics [15] and other basic research of iron bacteria, the Sphaerotilus natans which were separated from activity mud of Xiamen sewage treatment plant and the Leptothrix discophora which was purchased from ATCC, were used to deposit the iron and manganese ions respectively. The Sediments were collected and heat treated at high temperature to obtain the ferrite. And then the product morphology and static magnetic properties were characterized.

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Characteristics of hollow microtubes consisting of amorphous iron oxide nanoparticles produced by iron oxidizing bacteria, Leptothrix ochracea

Cited by 80 publications

References 3 publications

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

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

Treatment of Biogenic Iron-Containing Materials

Preparation and properties of ferrite derived from iron oxidizing bacteria

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