Microbial preparation of metal-substituted magnetite nanoparticles

Moon, Ji Won; Roh, Yul; Lauf, R.J.; Vali, Hojatollah; Yeary, Lucas W.; Phelps, Tommy J.

doi:10.1016/j.mimet.2007.04.012

Cited by 82 publications

(63 citation statements)

References 24 publications

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“…Magnetosomes [7] are the results of a mineralization process with biological control over the accumulation of iron and the deposition of the mineral particle with specific size and orientation within a membrane vesicle at specific locations in the cell. Moon [8]. discovered that certain thermophyl and psychrotolerant metal-reducer bacteria (Shewanella sp.…”

Section: Biological Production Of Nano Particlesmentioning

confidence: 99%

Elemental, Nano-Sized (100-500 nm) Selenium Production by Probiotic Lactic Acid Bacteria

Eszenyi¹,

Sztrik²,

Babka³

et al. 2011

IJBBB

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Abstract-Selenium is well known as an essential trace element since the 20th century, but it can be overdosed easily because of its toxicity. According to the present regulations [1] only the potentially most harmful, inorganic selenium salts can be added to any comestibles. Elemental selenium is considered as the least toxical of all selenium forms and in the same time supplementation with its nano-size particles has the same or better bioavailability compared to its salts. In our experiments we managed to produce nano-size (100-500nm) elemental selenium by using probiotic yogurt bacteria in a fermentation procedure. We developed the laboratory technology of product purification and recovery from bacteria.

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Section: Biological Production Of Nano Particlesmentioning

confidence: 99%

Elemental, Nano-Sized (100-500 nm) Selenium Production by Probiotic Lactic Acid Bacteria

Eszenyi¹,

Sztrik²,

Babka³

et al. 2011

IJBBB

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“…The ability of microbial cells to use highly structured compartments and biosynthetic activities to precisely direct the size, shape and, crystallinity of the material has emerged as a novel approach for the synthesis of inorganic nanoparticles. Microorganisms such as bacteria, [6][7][8][9] yeasts, 10-12 fungi, [13][14][15] algae, 16 and actinomycetes 17 have been shown to be useful for synthesizing nanoparticles. Methods using microorganisms for nanoparticle synthesis are economical, eco-friendly and can provide better control over particle size by compartmentalization in the periplasmic space and vesicles.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of lead sulfide nanoparticles by the lead resistant marine yeast, Rhodosporidium diobovatum

Seshadri

Saranya

Kowshik

2011

Biotechnology Progress

183

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Biosynthesis of nanoparticles using microorganisms has attracted a lot of attention in recent years as this route has the potential to lead to synthesis of monodisperse nanoparticles. Here, we report the intracellular synthesis of stable lead sulfide nanoparticles by a marine yeast, Rhodosporidium diobovatum. The PbS nanoparticles were characterized by UV-visible absorption spectroscopy, X-ray diffraction (XRD) and energy dispersive atomic spectroscopy (EDAX). UV-visible absorption scan revealed a peak at 320 nm, a characteristic of the nanosize range. XRD confirmed the presence of PbS nanoparticles of cubic structure. Crystallite size as determined from transmission electron microscopy was found to be in the range of 2-5 nm. Elemental analysis by EDAX revealed the presence of particles composed of lead and sulfur in a 1:2 ratio indicating that PbS nanoparticles were capped by a sulfur-rich peptide. A quantitative study of lead uptake through atomic absorption spectrometry revealed that 55% of lead in the medium was accumulated in the exponential phase, whereas a further 35% was accumulated in the stationary phase; thus, the overall recovery of PbS nanoparticles was 90%. The lead-exposed yeast displayed a marked increase (280% over the control) in nonprotein thiols in the stationary phase.

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“…Among all naturally occurring minerals on Earth, it is the most magnetic and is harmless to the environment and to living things. Therefore, it has attracted interest in various application fields including drug delivery, contrast agents for magnetic resonance imaging, immunoassays, and molecular biotechnology [48,49]. Furthermore, magnetite can be synthesized easily by the addition of stoichiometric amounts of Fe 2+ and Fe 3+ in ammonia, and basic solution and size control is possible; this suggests its various potential applications [50].…”

Section: Iron Oxidesmentioning

confidence: 99%

Role and Potential of Direct Interspecies Electron Transfer in Anaerobic Digestion

et al. 2018

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Anaerobic digestion (AD) is an effective biological treatment for stabilizing organic compounds in waste/wastewater and in simultaneously producing biogas. However, it is often limited by the slow reaction rates of different microorganisms' syntrophic biological metabolisms. Stable and fast interspecies electron transfer (IET) between volatile fatty acid-oxidizing bacteria and hydrogenotrophic methanogens is crucial for efficient methanogenesis. In this syntrophic interaction, electrons are exchanged via redox mediators such as hydrogen and formate. Recently, direct IET (DIET) has been revealed as an important IET route for AD. Microorganisms undergoing DIET form interspecies electrical connections via membrane-associated cytochromes and conductive pili; thus, redox mediators are not required for electron exchange. This indicates that DIET is more thermodynamically favorable than indirect IET. Recent studies have shown that conductive materials (e.g., iron oxides, activated carbon, biochar, and carbon fibers) can mediate direct electrical connections for DIET. Microorganisms attach to conductive materials' surfaces or vice versa according to particle size, and form conductive biofilms or aggregates. Different conductive materials promote DIET and improve AD performance in digesters treating different feedstocks, potentially suggesting a new approach to enhancing AD performance. This review discusses the role and potential of DIET in methanogenic systems, especially with conductive materials for promoting DIET.

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Microbial preparation of metal-substituted magnetite nanoparticles

Cited by 82 publications

References 24 publications

Elemental, Nano-Sized (100-500 nm) Selenium Production by Probiotic Lactic Acid Bacteria

Elemental, Nano-Sized (100-500 nm) Selenium Production by Probiotic Lactic Acid Bacteria

Green synthesis of lead sulfide nanoparticles by the lead resistant marine yeast, Rhodosporidium diobovatum

Role and Potential of Direct Interspecies Electron Transfer in Anaerobic Digestion

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