Micro-Organism-Gold Interactions

Savvaidis, Ioannis N.; Карамушка, Віктор; Lee, H.; Trevors, J. T.

doi:10.1023/b:biom.0000030925.56070.56

Cited by 35 publications

(22 citation statements)

References 34 publications

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“…Although the efforts directed towards the biosynthesis of nanomaterials are recent, the interactions between micro-organisms and metals have been well documented (11)(12)(13)(14) and the ability of micro-organisms to extract and/or accumulate metals is employed in commercial biotechnological processes such as bioleaching and bioremediation.…”

Section: Introductionmentioning

confidence: 99%

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Microbial production of gold nanoparticles

2006

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Section: Introductionmentioning

confidence: 99%

“…In addition, the possibility to manipulate the size and shape of gold nanoparticles by altering key growth parameters was investigated. (16,17,24) and accumulate gold from solution (13,19,32).…”

Section: Introductionmentioning

confidence: 99%

Microbial production of gold nanoparticles

2006

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“…Heavy metal pollution represents an important environmental problem because of toxic effects of metals. Interest in the development of metal removal by biosorption using microorganisms is shown in literature [1][2][3][4][5][6][7][8][9][10][11]. Cyanobacteria (blue green algae) represent the largest and most diverse group of photosynthetic prokaryotes.…”

Section: Introductionmentioning

confidence: 99%

“…Some bacteria have evolved the mechanisms of detoxication of heavy metals, and some even use them for respiration. In [9] the recovery of gold using algae cells was investigated, and in [10,11] the microorganism-gold interaction was studied. The investigation of the efficacy of the metal uptake by the microbial biomass is essential for the industrial application of biosorption.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Heavy Metals Biosorption by Different Types of Bacteria

Gelagutashvili¹

2013

OJMetal

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Biosorption of Cd(II), Ag(I) and Au(III) by cyanobacteria Spirulina platensis, of Au(II)-by Streptomyces spp. 19H, and of Cr(VI) and Cr(III)-by Arthrobacter species was studied by using the dialysis and atomic absorption analysis under various conditions. In particular, the impact of the following parameters on biosorption was studied: pH (for Ag, Cd, Au), living and non-living cells (for Cr), heavy metal valence (for Cr), homogenized and non-homogenized cells (for Au), Zn(II) ions (on Cr(VI)-Arthrobacter species). It was shown that biosorption efficiency of Cr(III), Cr(VI), Cd(II), Au(III) and Ag(I) ions is likely to depend on the type of bacteria used as well as on the conditions under which the uptake processes proceeded. It was shown that metal removal by microorganisms was influenced by physicalchemical parameters. The pH value of 7.0 was optimum for the removal of Ag(I) and Cd(II) by Spirulina platensis. At a low pH value of 5.5, Au (III) was by test algae more efficiently than Cd(II) and Ag(I).

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“…Although the biosynthesis of nanomaterials is recent, the interactions between microorganisms and metals have been well documented (Slawson et al, 1990;Beveridge et al, 1997;Savvaidis et al, 1998;Malik, 2004). Ability of micro-organisms to extract and/or accumulate metals is being employed in commercial biotechnological processes such as bioleaching and bioremediation.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting the Geometry of Silver Nanoparticles Synthesis in <i>Chrysosporium Tropicum</i> and <i>Fusarium Oxysporum</i>

Soni¹,

Prakash²

2011

American Journal of Nanotechnology

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Problem statement: Biosynthesis of nanoparticles using fungal cells is a novel approach to develop biotechnological possess such as bioleaching and bioremediation. In the present study, an effort was made to investigate the effect of physio-chemical parameters on the silver nanoparticle formation with the fungus Chrysosporium tropicum Carmichael and Fusarium oxysporum Schltdl. Approach: The possibilities to manipulating the geometry of silver nanoparticles by altering the key growth parameters such as pH, temperature, concentrations and time have been explored. The effect of AgNO 3 with the cell free extract of fungi and time, temperature, pH with the formation of silver has also been investigated. The presence of nanosilver has been carried out with the Micro-scan reader and has been confirmed by X-Rays Diffractometer (XRD). The micrographs of the silver nanoparticles have been evaluated through the Transmission Electron Microscope (TEM) and confirmed by Scanning Electron Microscope (SEM). The effect of concentrations with response to time, temperature and pH has studied with the help of Micro-scan reader and their microstructure analyzed by TEM and SEM. Results: It was observed that fungus C. tropicum and F. oxysporum Schltdl significantly activate the extra-cellular production of silver nanoparticles. The different sized and spherical shaped nanoparticles have been formed in different strains. With the increase in concentration, the absorbance increased with response to time (24-120h) and temperature. Significantly, the pH was found decreasing with the increase of absorbance. Conclusion: We presume that these changes initiate new geometry of nanosilver in the cell free solutions. These different shaped, sized and geometry of nanoparticles can be used in the field of medicine for drug formation and diseases diagnosis.

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Micro-Organism-Gold Interactions

Cited by 35 publications

References 34 publications

Microbial production of gold nanoparticles

Microbial production of gold nanoparticles

Comparative Study on Heavy Metals Biosorption by Different Types of Bacteria

Factors Affecting the Geometry of Silver Nanoparticles Synthesis in <i>Chrysosporium Tropicum</i> and <i>Fusarium Oxysporum</i>

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