Formation of Nanoscale Elemental Silver Particles via Enzymatic Reduction by
            <i>Geobacter sulfurreducens</i>

Law, Nicholas; Ansari, Saadia; Livens, Francis R.; Renshaw, Joanna C.; Lloyd, Jonathan R.

doi:10.1128/aem.01069-08

Cited by 141 publications

(76 citation statements)

References 19 publications

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“…Silver is an element that has been used widely in industrial processes as diverse as photographic processing, catalysis, mirror production, electroplating, alkaline battery production, and jewelry making (18). It has been known for some time that silver ions and silver-based compounds can be highly toxic to microorganisms, and with increasing concern about pathogenic "superbugs" with high resistance to conventional antibiotics, silver is attracting much interest as a potential biocide (11,18,36,42).…”

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“…It has been known for some time that silver ions and silver-based compounds can be highly toxic to microorganisms, and with increasing concern about pathogenic "superbugs" with high resistance to conventional antibiotics, silver is attracting much interest as a potential biocide (11,18,36,42). Silver has no known physiological functions and can exist in several oxidation states, although it is most commonly encountered in its elemental [Ag(0)] and monovalent [Ag(I)] forms.…”

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confidence: 99%

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Impact of Silver(I) on the Metabolism of Shewanella oneidensis

et al. 2010

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Anaerobic cultures of Shewanella oneidensis MR-1 reduced toxic Ag(I), forming nanoparticles of elemental Ag(0), as confirmed by X-ray diffraction analyses. The addition of 1 to 50 M Ag(I) had a limited impact on growth, while 100 M Ag(I) reduced both the doubling time and cell yields. At this higher Ag(I) concentration transmission electron microscopy showed the accumulation of elemental silver particles within the cell, while at lower concentrations the metal was exclusively reduced and precipitated outside the cell wall. Whole organism metabolite fingerprinting, using the method of Fourier transform infrared spectroscopy analysis of cells grown in a range of silver concentrations, confirmed that there were significant physiological changes at 100 M silver. Principal component-discriminant function analysis scores and loading plots highlighted changes in certain functional groups, notably, lipids, amides I and II, and nucleic acids, as being discriminatory. Molecular analyses confirmed a dramatic drop in cellular yields of both the phospholipid fatty acids and their precursor molecules at high concentrations of silver, suggesting that the structural integrity of the cellular membrane was compromised at high silver concentrations, which was a result of intracellular accumulation of the toxic metal.

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Impact of Silver(I) on the Metabolism of Shewanella oneidensis

et al. 2010

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“…The detected size of AgNPs synthesized by S. chartarum may agree or differ with previous scientific papers, this may be due to the species type, incubation period or environmental conditions of microbial growth. Size of AgNPs was 5-25, 10-100, 5-40, 200 and 500 nm produced by Aspergillus fumigates (Bhainsa and D'Souza, 2006), Cladosporium cladosporioides (Balaji et al, 2009), Trichoderma viride (Fayaz et al, 2010), Geobacter sulfurreducens (Law et al, 2008) and Lactobacillus Strains (Nair and Pradeep, 2002) respectively. Also, from the extracellular secretion of Schizophyllum commune, Lentinus sajar-caju and Pycnoporus sanguineus, it is observed that nanoparticles size was 42.12, 89.76 and 120.6 nm respectively (Yen San and Mashitah, 2012).…”

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confidence: 99%

Stachybotrys chartarum: A Novel Biological Agent for The Extracellular Synthesis of Silver Nanoparticles and Their Antimicrobial Activity

Mohamed¹

2015

IJBiotech

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Microbial assisted biosynthesis of nanoparticles is a rapidly progressing area of nanobiotechnology. In this paper Stachybotrys chartarum assisted extracellular synthesis of silver nanoparticles (AgNPs) is reported when challenged with 1mM silver nitrate (AgNO 3 ). The characterization of AgNPs was carried out visual observation and UV-Vis spectrophotometry. Further analysis carried out by Fourier Transform Infrared Spectroscopy (FTIR), provides evidence for the presence of proteins as capping agent, which helps in increasing the stability of the synthesized AgNPs. Transmission Electron Microscopy (TEM) investigations confi rmed that AgNPs were formed. The synthesized silver nanoparticles were found in the range of 65-108 nm. Finally, the antimicrobial susceptibility of AgNPs synthesized was investigated which exhibited more potent activity against bacteria than fungi compared with using silver nitrate at concentration 1mM.

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“…The Chemical-free disinfection is considered to be an attractive alternative and it is usually associated with silver metal. While silver has been known to be a bactericide element for at least 1200 years, colloidal silver or silver MNPs have recently been recognized and tested in various applications as excellent antimicrobial agents because of their high biocide activity (Kong & Jang, 2008;Law, 2008;Pal et al, 2007). The antibacterial action of silver MNPs is still under debate but it has been reported to be similar to that of silver ions, which bind to DNA, block transcription, and therefore interrupt the bacterial respiration and the adenosine triphosphate synthesis.…”

Section: Biocide and Antibiofouling Applicationsmentioning

confidence: 99%