The Experts below are selected from a list of 15321 Experts worldwide ranked by ideXlab platform
Jonathan R. Lloyd - One of the best experts on this subject based on the ideXlab platform.
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal‐reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non‐mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light‐emitting properties, which may have unique applic...
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal-reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non-mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light-emitting properties, which may have unique applications in the realm of nanophotonics. This research offers the potential to combine remediation of contaminants with the development of environmentally friendly manufacturing pathways for novel bionanominerals.
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microbial manufacture of chalcogenide based nanoparticles via the reduction of selenite using veillonella atypica an in situ exafs study
Nanotechnology, 2008Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Frederick J W Mosselmans, Terry J Beveridge, Jonathan R. LloydAbstract:The ability of metal-reducing bacteria to produce nanoparticles, and their precursors, can be harnessed for the biological manufacture of fluorescent, semiconducting nanomaterials. The anaerobic bacterium Veillonella atypica can reduce selenium oxyanions to form nanospheres of elemental selenium. These selenium nanospheres are then further reduced by the bacterium to form reactive Selenide which could be precipitated with a suitable metal cation to produce nanoscale chalcogenide precipitates, such as zinc Selenide, with optical and semiconducting properties. The whole cells used hydrogen as the electron donor for selenite reduction and an enhancement of the reduction rate was observed with the addition of a redox mediator (anthraquinone disulfonic acid). A novel synchrotron-based in situ time-resolved x-ray absorption spectroscopy technique was used, in conjunction with ion chromatography and inductively coupled plasma-atomic emission spectroscopy, to study the mechanisms and kinetics of the microbial reduction of selenite to Selenide. The products of this biotransformation were also assessed using electron microscopy, energy-dispersive spectroscopy, x-ray diffraction and fluorescence spectroscopy. This process offers the potential to prepare chalcogenide-based nanocrystals, for application in optoelectronic devices and biological labelling, from more environmentally benign precursors than those used in conventional organometallic synthesis.
Carolyn I Pearce - One of the best experts on this subject based on the ideXlab platform.
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal‐reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non‐mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light‐emitting properties, which may have unique applic...
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal-reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non-mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light-emitting properties, which may have unique applications in the realm of nanophotonics. This research offers the potential to combine remediation of contaminants with the development of environmentally friendly manufacturing pathways for novel bionanominerals.
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microbial manufacture of chalcogenide based nanoparticles via the reduction of selenite using veillonella atypica an in situ exafs study
Nanotechnology, 2008Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Frederick J W Mosselmans, Terry J Beveridge, Jonathan R. LloydAbstract:The ability of metal-reducing bacteria to produce nanoparticles, and their precursors, can be harnessed for the biological manufacture of fluorescent, semiconducting nanomaterials. The anaerobic bacterium Veillonella atypica can reduce selenium oxyanions to form nanospheres of elemental selenium. These selenium nanospheres are then further reduced by the bacterium to form reactive Selenide which could be precipitated with a suitable metal cation to produce nanoscale chalcogenide precipitates, such as zinc Selenide, with optical and semiconducting properties. The whole cells used hydrogen as the electron donor for selenite reduction and an enhancement of the reduction rate was observed with the addition of a redox mediator (anthraquinone disulfonic acid). A novel synchrotron-based in situ time-resolved x-ray absorption spectroscopy technique was used, in conjunction with ion chromatography and inductively coupled plasma-atomic emission spectroscopy, to study the mechanisms and kinetics of the microbial reduction of selenite to Selenide. The products of this biotransformation were also assessed using electron microscopy, energy-dispersive spectroscopy, x-ray diffraction and fluorescence spectroscopy. This process offers the potential to prepare chalcogenide-based nanocrystals, for application in optoelectronic devices and biological labelling, from more environmentally benign precursors than those used in conventional organometallic synthesis.
John M Charnock - One of the best experts on this subject based on the ideXlab platform.
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal‐reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non‐mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light‐emitting properties, which may have unique applic...
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal-reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non-mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light-emitting properties, which may have unique applications in the realm of nanophotonics. This research offers the potential to combine remediation of contaminants with the development of environmentally friendly manufacturing pathways for novel bionanominerals.
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microbial manufacture of chalcogenide based nanoparticles via the reduction of selenite using veillonella atypica an in situ exafs study
Nanotechnology, 2008Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Frederick J W Mosselmans, Terry J Beveridge, Jonathan R. LloydAbstract:The ability of metal-reducing bacteria to produce nanoparticles, and their precursors, can be harnessed for the biological manufacture of fluorescent, semiconducting nanomaterials. The anaerobic bacterium Veillonella atypica can reduce selenium oxyanions to form nanospheres of elemental selenium. These selenium nanospheres are then further reduced by the bacterium to form reactive Selenide which could be precipitated with a suitable metal cation to produce nanoscale chalcogenide precipitates, such as zinc Selenide, with optical and semiconducting properties. The whole cells used hydrogen as the electron donor for selenite reduction and an enhancement of the reduction rate was observed with the addition of a redox mediator (anthraquinone disulfonic acid). A novel synchrotron-based in situ time-resolved x-ray absorption spectroscopy technique was used, in conjunction with ion chromatography and inductively coupled plasma-atomic emission spectroscopy, to study the mechanisms and kinetics of the microbial reduction of selenite to Selenide. The products of this biotransformation were also assessed using electron microscopy, energy-dispersive spectroscopy, x-ray diffraction and fluorescence spectroscopy. This process offers the potential to prepare chalcogenide-based nanocrystals, for application in optoelectronic devices and biological labelling, from more environmentally benign precursors than those used in conventional organometallic synthesis.
Nicholas Law - One of the best experts on this subject based on the ideXlab platform.
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal‐reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non‐mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light‐emitting properties, which may have unique applic...
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal-reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non-mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light-emitting properties, which may have unique applications in the realm of nanophotonics. This research offers the potential to combine remediation of contaminants with the development of environmentally friendly manufacturing pathways for novel bionanominerals.
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microbial manufacture of chalcogenide based nanoparticles via the reduction of selenite using veillonella atypica an in situ exafs study
Nanotechnology, 2008Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Frederick J W Mosselmans, Terry J Beveridge, Jonathan R. LloydAbstract:The ability of metal-reducing bacteria to produce nanoparticles, and their precursors, can be harnessed for the biological manufacture of fluorescent, semiconducting nanomaterials. The anaerobic bacterium Veillonella atypica can reduce selenium oxyanions to form nanospheres of elemental selenium. These selenium nanospheres are then further reduced by the bacterium to form reactive Selenide which could be precipitated with a suitable metal cation to produce nanoscale chalcogenide precipitates, such as zinc Selenide, with optical and semiconducting properties. The whole cells used hydrogen as the electron donor for selenite reduction and an enhancement of the reduction rate was observed with the addition of a redox mediator (anthraquinone disulfonic acid). A novel synchrotron-based in situ time-resolved x-ray absorption spectroscopy technique was used, in conjunction with ion chromatography and inductively coupled plasma-atomic emission spectroscopy, to study the mechanisms and kinetics of the microbial reduction of selenite to Selenide. The products of this biotransformation were also assessed using electron microscopy, energy-dispersive spectroscopy, x-ray diffraction and fluorescence spectroscopy. This process offers the potential to prepare chalcogenide-based nanocrystals, for application in optoelectronic devices and biological labelling, from more environmentally benign precursors than those used in conventional organometallic synthesis.
Richard A. D. Pattrick - One of the best experts on this subject based on the ideXlab platform.
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal‐reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non‐mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light‐emitting properties, which may have unique applic...
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investigating different mechanisms for biogenic selenite transformations geobacter sulfurreducens shewanella oneidensis and veillonella atypica
Environmental Technology, 2009Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Jon W Fellowes, Ronald S Oremland, Jonathan R. LloydAbstract:The metal-reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non-mobile elemental selenium and then to Selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal Selenide nanoparticles, have catalytic, semiconducting and light-emitting properties, which may have unique applications in the realm of nanophotonics. This research offers the potential to combine remediation of contaminants with the development of environmentally friendly manufacturing pathways for novel bionanominerals.
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microbial manufacture of chalcogenide based nanoparticles via the reduction of selenite using veillonella atypica an in situ exafs study
Nanotechnology, 2008Co-Authors: Carolyn I Pearce, Victoria S. Coker, Richard A. D. Pattrick, Nicholas Law, John M Charnock, Frederick J W Mosselmans, Terry J Beveridge, Jonathan R. LloydAbstract:The ability of metal-reducing bacteria to produce nanoparticles, and their precursors, can be harnessed for the biological manufacture of fluorescent, semiconducting nanomaterials. The anaerobic bacterium Veillonella atypica can reduce selenium oxyanions to form nanospheres of elemental selenium. These selenium nanospheres are then further reduced by the bacterium to form reactive Selenide which could be precipitated with a suitable metal cation to produce nanoscale chalcogenide precipitates, such as zinc Selenide, with optical and semiconducting properties. The whole cells used hydrogen as the electron donor for selenite reduction and an enhancement of the reduction rate was observed with the addition of a redox mediator (anthraquinone disulfonic acid). A novel synchrotron-based in situ time-resolved x-ray absorption spectroscopy technique was used, in conjunction with ion chromatography and inductively coupled plasma-atomic emission spectroscopy, to study the mechanisms and kinetics of the microbial reduction of selenite to Selenide. The products of this biotransformation were also assessed using electron microscopy, energy-dispersive spectroscopy, x-ray diffraction and fluorescence spectroscopy. This process offers the potential to prepare chalcogenide-based nanocrystals, for application in optoelectronic devices and biological labelling, from more environmentally benign precursors than those used in conventional organometallic synthesis.
