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      Mechanistic aspects of biosynthesis of silver nanoparticles by several Fusarium oxysporum strains

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          Abstract

          Extracellular production of metal nanoparticles by several strains of the fungus Fusarium oxysporum was carried out. It was found that aqueous silver ions when exposed to several Fusarium oxysporum strains are reduced in solution, thereby leading to the formation of silver hydrosol. The silver nanoparticles were in the range of 20–50 nm in dimensions. The reduction of the metal ions occurs by a nitrate-dependent reductase and a shuttle quinone extracellular process. The potentialities of this nanotechnological design based in fugal biosynthesis of nanoparticles for several technical applications are important, including their high potential as antibacterial material.

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          Fungus-Mediated Synthesis of Silver Nanoparticles and Their Immobilization in the Mycelial Matrix: A Novel Biological Approach to Nanoparticle Synthesis

          Priyabrata Mukherjee, Absar Ahmad, Deendayal Mandal … (2001)
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            Extracellular synthesis of silver nanoparticles by a silver-tolerant yeast strain MKY3

            Meenal Kowshik, Shriwas Ashtaputre, Sharmin Kharrazi … (2003)
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              A role for excreted quinones in extracellular electron transfer.

              R. Kolter, Jeff Newman (2000)
              Respiratory processes in bacteria are remarkable because of their ability to use a variety of compounds, including insoluble minerals, as terminal electron acceptors. Although much is known about microbial electron transport to soluble electron acceptors, little is understood about electron transport to insoluble compounds such as ferric oxides. In anaerobic environments, humic substances can serve as electron acceptors and also as electron shuttles to ferric oxides. To explore this process, we identified mutants in Shewanella putrefaciens that are unable to respire on humic substances. Here we show that these mutants contain disruptions in a gene that is involved in the biosynthesis of menaquinone. During growth, the wild type releases a menaquinone-related redox-active small molecule into the medium that complements the mutants. This finding raises the possibility that electron transfer to a variety of oxidants, including poorly soluble minerals, may be mediated by microbially excreted quinones that have yet to be identified.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Nanobiotechnology
                Title: Journal of Nanobiotechnology
                Publisher: BioMed Central (London )
                ISSN (Electronic): 1477-3155
                Publication date Collection: 2005
                Publication date (Electronic): 13 July 2005
                Volume: 3
                Page: 8
                Affiliations
                [1 ]Biological Chemistry Laboratory, Instituto de Química, Universidade Estadual de Campinas, CEP 13084862, Caixa Postal 6154, Campinas, S.P., Brazil
                [2 ]Biological Chemistry and Biotechnology Laboratory, Center Environmental Sciences, Universidade de Mogi das Cruzes, Mogi das Cruzes, S.P., Brazil
                [3 ]Solid State Chemistry Laboratory, Instituto de Química, Universidade Estadual de Campinas, CEP 13084862, Caixa Postal 6154, Campinas, S.P., Brazil
                Article
                Publisher ID: 1477-3155-3-8
                DOI: 10.1186/1477-3155-3-8
                PMC ID: 1180851
                PubMed ID: 16014167
                SO-VID: 7defb5fc-67ab-44c7-a23f-66f5b888a484
                Copyright © Copyright © 2005 Durán et al; licensee BioMed Central Ltd.
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 11 January 2005
                Date accepted : 13 July 2005
                Categories
                Subject: Research

                ScienceOpen disciplines: Biotechnology
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                ScienceOpen disciplines: Biotechnology

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