Molecular Mechanism of Magnet Formation in Bacteria.

Matsunaga, Tadashi; Sakaguchi, Toshifumi

doi:10.1263/jbb.90.1

Cited by 14 publications

(15 citation statements)

References 101 publications

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“…Further, BMPs formed by molecular and genetic approaches have been applied to biotechnology, for example bioassay and chip technology. This research is summarized in a review article [124].…”

Section: Bacterial Magnetic Particles (Bmps)mentioning

confidence: 99%

Current research activity in biosensors

Nakamura

Karube

2003

Analytical and Bioanalytical Chemistry

261

129

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Biosensors consist of a molecular recognition element and a transducer. Since the first biosensor was developed by Updike and Hicks many biosensors and their associated techniques have been studied and developed. In this review current research activity on the fundamentals and applications of biosensors is summarized. In discussion of the former, molecular recognition elements, techniques and tools for biosensor construction, and basic biosensor devices are introduced. Coverage of the latter includes description of biosensors for environmental, food, and clinical fields. Chemical sensors developed in our laboratory for environmental monitoring are also described. This review mainly summarizes work performed by our group and by our colleagues, and refers to the main review articles summarizing each field of biosensor research in recent years.

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Section: Bacterial Magnetic Particles (Bmps)mentioning

confidence: 99%

Current research activity in biosensors

Nakamura

Karube

2003

Analytical and Bioanalytical Chemistry

261

129

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“…Some well‐known examples of microorganisms synthesizing inorganic materials include magnetotactic bacteria (magnetite nanoparticles),1–3 diatoms (siliceous materials),4–6 and S‐layer bacteria (gypsum and calcium carbonate layers) 7. 8 Biosynthesis of nanoparticulate magnetite (Fe 3 O 4 )9 and greigite (Fe 3 S 4 )9, 10 by bacteria has been studied in great detail; however, the biochemical process is yet to be fully understood. Here we show that nanoparticulate magnetite may be produced at room temperature extracellularly by challenging the fungi, Fusarium oxysporum and Verticillium sp.…”

Section: Introductionmentioning

confidence: 99%

“…Current chemical methods for the synthesis of magnetic iron oxide nanoparticles are energy intensive, employ toxic chemicals, and often yield particles in nonpolar organic solutions,14 thereby precluding biomedical application. On the other hand, the biological growth of oxides such as silica4–6 and magnetite1–3, 9, 10 occurs in water at room temperature and at close to neutral pH conditions. Very recently, we have shown the protein‐mediated extracellular synthesis of silica,15a titania,15a and zirconia15b nanoparticles using the fungus Fusarium oxysporum (the same fungus has also been used to prepare Au–Ag alloy nanoparticles [15c] ).…”

Section: Introductionmentioning

confidence: 99%

Extracellular Biosynthesis of Magnetite using Fungi

Bharde

Rautaray

Bansal

et al. 2005

Small

410

152

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The development of synthetic processes for oxide nanomaterials is an issue of considerable topical interest. While a number of chemical methods are available and are extensively used, the collaborations are often energy intensive and employ toxic chemicals. On the other hand, the synthesis of inorganic materials by biological systems is characterized by processes that occur at close to ambient temperatures and pressures, and at neutral pH (examples include magnetotactic bacteria, diatoms, and S-layer bacteria). Here we show that nanoparticulate magnetite may be produced at room temperature extracellularly by challenging the fungi, Fusarium oxysporum and Verticillium sp., with mixtures of ferric and ferrous salts. Extracellular hydrolysis of the anionic iron complexes by cationic proteins secreted by the fungi results in the room-temperature synthesis of crystalline magnetite particles that exhibit a signature of a ferrimagnetic transition with a negligible amount of spontaneous magnetization at low temperature.

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“…In the case of biomineralization, delineated reaction volumes have to be created. For intracellular material deposition, the confined space may either be provided by protein cages [120,121] or lipid vesicles [122]. Biominerals of larger size e.g.…”

Section: Supramolecular Preorganizationmentioning

confidence: 99%

From Sol-Gel Processing to Bio-Inspired Materials Synthesis

Löbmann

2007

CNANO

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The improvement of materials performance and their respective processing routes ever has been the driving force for material science and engineering. For the preparation of non-metallic inorganic materials the synthesis from chemical precursors is a field of steadily increasing scientific and industrial importance: Products in a broad variety of compositions can be obtained by sol-gel techniques. The shaping of intermediates allows the specific preparation of many microarchitectural configurations such as powders, fibers, thin films and aerogels. For purely inorganic products the sintering temperatures are low compared to conventional mixed-oxide ceramic processing which enables e.g. the coating of glasses and metals. Hybrid inorganic-organic compositions combine some advantages of polymers and ceramics.Nature has found amazing alternative ways to produce high-performance inorganic-organic composites at ambient temperatures under physiological conditions: Teeth, bone and nacre are self-evident examples for the capability of biomineralization processes.Even though many aspects of the related mechanisms in vivo are not yet fully understood, the utilization of the basic strategies of natural biomineralization has become a challenge to material scientist in an interdisciplinary approach.In this paper the strong points of sol-gel processing are highlighted, its limitations are discussed and related to the unique characteristics of natural biomineralization. Subsequently biomimetic and biologically-inspired material syntheses routes are reviewed which try to compensate the shortcomings of sol-gel techniques.

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Molecular Mechanism of Magnet Formation in Bacteria.

Cited by 14 publications

References 101 publications

Current research activity in biosensors

Current research activity in biosensors

Extracellular Biosynthesis of Magnetite using Fungi

From Sol-Gel Processing to Bio-Inspired Materials Synthesis

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