The Experts below are selected from a list of 3252 Experts worldwide ranked by ideXlab platform
Jerome F L Duval - One of the best experts on this subject based on the ideXlab platform.
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probing surface structures of shewanella spp by Microelectrophoresis
Biophysical Journal, 2006Co-Authors: Etienne Dague, Jerome F L Duval, F Jorand, Fabien Thomas, Fabien GaboriaudAbstract:Long-range electrostatic forces substantially influence bacterial interactions and bacterial adhesion during the preliminary steps of biofilm formation. The strength of these forces depends strongly on the structure of the bacterium surfaces investigated. The latter may be addressed from appropriate analysis of electrophoretic mobility measurements. Due to the permeable character of the bacterium wall and/or surrounding polymer layer, bacteria may be regarded as paradigms of soft bioparticles. The electrophoretic motion of such particles in a direct-current electric field differs considerably from that of their rigid counterparts in the sense that electroosmotic flow takes place around and within the soft surface layer. Recent developments of electrokinetic theories for soft particles now render possible the evaluation of the softness degree (or equivalently the hydrodynamic permeability) from the raw electrokinetic data. In this article, the electrophoretic mobilities of three Shewanella strains (MR-4, CN32, and BrY) presenting various and well-characterized phenotypes of polymer fringe are reported over a wide range of pH and ionic strength conditions. The data are quantitatively analyzed on the basis of a rigorous numerical evaluation of the governing electrostatic and hydrodynamic equations for soft particles. It is clearly shown how the peculiar surface structures of the bacteria investigated are reflected in their electrohydrodynamic properties.
Fabien Gaboriaud - One of the best experts on this subject based on the ideXlab platform.
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probing surface structures of shewanella spp by Microelectrophoresis
Biophysical Journal, 2006Co-Authors: Etienne Dague, Jerome F L Duval, F Jorand, Fabien Thomas, Fabien GaboriaudAbstract:Long-range electrostatic forces substantially influence bacterial interactions and bacterial adhesion during the preliminary steps of biofilm formation. The strength of these forces depends strongly on the structure of the bacterium surfaces investigated. The latter may be addressed from appropriate analysis of electrophoretic mobility measurements. Due to the permeable character of the bacterium wall and/or surrounding polymer layer, bacteria may be regarded as paradigms of soft bioparticles. The electrophoretic motion of such particles in a direct-current electric field differs considerably from that of their rigid counterparts in the sense that electroosmotic flow takes place around and within the soft surface layer. Recent developments of electrokinetic theories for soft particles now render possible the evaluation of the softness degree (or equivalently the hydrodynamic permeability) from the raw electrokinetic data. In this article, the electrophoretic mobilities of three Shewanella strains (MR-4, CN32, and BrY) presenting various and well-characterized phenotypes of polymer fringe are reported over a wide range of pH and ionic strength conditions. The data are quantitatively analyzed on the basis of a rigorous numerical evaluation of the governing electrostatic and hydrodynamic equations for soft particles. It is clearly shown how the peculiar surface structures of the bacteria investigated are reflected in their electrohydrodynamic properties.
Etienne Dague - One of the best experts on this subject based on the ideXlab platform.
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probing surface structures of shewanella spp by Microelectrophoresis
Biophysical Journal, 2006Co-Authors: Etienne Dague, Jerome F L Duval, F Jorand, Fabien Thomas, Fabien GaboriaudAbstract:Long-range electrostatic forces substantially influence bacterial interactions and bacterial adhesion during the preliminary steps of biofilm formation. The strength of these forces depends strongly on the structure of the bacterium surfaces investigated. The latter may be addressed from appropriate analysis of electrophoretic mobility measurements. Due to the permeable character of the bacterium wall and/or surrounding polymer layer, bacteria may be regarded as paradigms of soft bioparticles. The electrophoretic motion of such particles in a direct-current electric field differs considerably from that of their rigid counterparts in the sense that electroosmotic flow takes place around and within the soft surface layer. Recent developments of electrokinetic theories for soft particles now render possible the evaluation of the softness degree (or equivalently the hydrodynamic permeability) from the raw electrokinetic data. In this article, the electrophoretic mobilities of three Shewanella strains (MR-4, CN32, and BrY) presenting various and well-characterized phenotypes of polymer fringe are reported over a wide range of pH and ionic strength conditions. The data are quantitatively analyzed on the basis of a rigorous numerical evaluation of the governing electrostatic and hydrodynamic equations for soft particles. It is clearly shown how the peculiar surface structures of the bacteria investigated are reflected in their electrohydrodynamic properties.
Serguei N. Lvov - One of the best experts on this subject based on the ideXlab platform.
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zetameter for Microelectrophoresis studies of the oxide water interface at temperatures up to 200 c
Review of Scientific Instruments, 2003Co-Authors: Xiangyang Zhou, X. J. Wei, Mark Fedkin, K. H. Strass, Serguei N. LvovAbstract:The zeta potential (ZP) is an important and measurable parameter related to the electrical double layer structure at a solid-aqueous solution interface. A high temperature zetameter based on the Microelectrophoresis technique was developed to determine the zeta potential and the isoelectric point (IEP) of the metal oxide/water interfaces at temperatures up to 200 °C and pressures up to 50 bar. Design of the Microelectrophoresis cell, the main unit of the zetameter, utilized a flow-through concept and the cell internals were made from corrosion resistant materials in order to minimize materials degradation and solution contamination. Two sapphire windows were installed to the Microelectrophoresis cell to enable observation of the particle movement under an imposed electrical field. A ZrO2 powder was used to test the zetameter. The ZP for the ZrO2/water system was measured over wide ranges of temperature and pH. The IEP of the ZrO2/water system was found equal to 6.05 at room temperature, 5.00 at 120 °C, an...
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Zetameter for Microelectrophoresis studies of the oxide/water interface at temperatures up to 200 °C
Review of Scientific Instruments, 2003Co-Authors: Xiangyang Zhou, X. J. Wei, Mark Fedkin, K. H. Strass, Serguei N. LvovAbstract:The zeta potential (ZP) is an important and measurable parameter related to the electrical double layer structure at a solid-aqueous solution interface. A high temperature zetameter based on the Microelectrophoresis technique was developed to determine the zeta potential and the isoelectric point (IEP) of the metal oxide/water interfaces at temperatures up to 200 °C and pressures up to 50 bar. Design of the Microelectrophoresis cell, the main unit of the zetameter, utilized a flow-through concept and the cell internals were made from corrosion resistant materials in order to minimize materials degradation and solution contamination. Two sapphire windows were installed to the Microelectrophoresis cell to enable observation of the particle movement under an imposed electrical field. A ZrO2 powder was used to test the zetameter. The ZP for the ZrO2/water system was measured over wide ranges of temperature and pH. The IEP of the ZrO2/water system was found equal to 6.05 at room temperature, 5.00 at 120 °C, an...
Xiangyang Zhou - One of the best experts on this subject based on the ideXlab platform.
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zetameter for Microelectrophoresis studies of the oxide water interface at temperatures up to 200 c
Review of Scientific Instruments, 2003Co-Authors: Xiangyang Zhou, X. J. Wei, Mark Fedkin, K. H. Strass, Serguei N. LvovAbstract:The zeta potential (ZP) is an important and measurable parameter related to the electrical double layer structure at a solid-aqueous solution interface. A high temperature zetameter based on the Microelectrophoresis technique was developed to determine the zeta potential and the isoelectric point (IEP) of the metal oxide/water interfaces at temperatures up to 200 °C and pressures up to 50 bar. Design of the Microelectrophoresis cell, the main unit of the zetameter, utilized a flow-through concept and the cell internals were made from corrosion resistant materials in order to minimize materials degradation and solution contamination. Two sapphire windows were installed to the Microelectrophoresis cell to enable observation of the particle movement under an imposed electrical field. A ZrO2 powder was used to test the zetameter. The ZP for the ZrO2/water system was measured over wide ranges of temperature and pH. The IEP of the ZrO2/water system was found equal to 6.05 at room temperature, 5.00 at 120 °C, an...
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Zetameter for Microelectrophoresis studies of the oxide/water interface at temperatures up to 200 °C
Review of Scientific Instruments, 2003Co-Authors: Xiangyang Zhou, X. J. Wei, Mark Fedkin, K. H. Strass, Serguei N. LvovAbstract:The zeta potential (ZP) is an important and measurable parameter related to the electrical double layer structure at a solid-aqueous solution interface. A high temperature zetameter based on the Microelectrophoresis technique was developed to determine the zeta potential and the isoelectric point (IEP) of the metal oxide/water interfaces at temperatures up to 200 °C and pressures up to 50 bar. Design of the Microelectrophoresis cell, the main unit of the zetameter, utilized a flow-through concept and the cell internals were made from corrosion resistant materials in order to minimize materials degradation and solution contamination. Two sapphire windows were installed to the Microelectrophoresis cell to enable observation of the particle movement under an imposed electrical field. A ZrO2 powder was used to test the zetameter. The ZP for the ZrO2/water system was measured over wide ranges of temperature and pH. The IEP of the ZrO2/water system was found equal to 6.05 at room temperature, 5.00 at 120 °C, an...