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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Poon, Wilson C. K. Martinez, Vincent A. Schwarz-linek, Jana Reufer, Mathias Wilson, Laurence G. Morozov, Alexander N. |
| Description | Author Affiliation: Martinez VA ( Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom); Schwarz-Linek J ( Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom); Reufer M ( Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom); Wilson LG ( Department of Physics, University of York, York YO10 5DD, United Kingdom); Morozov AN ( Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom); Poon WC ( Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom); |
| Abstract | It is widely believed that the swimming speed, v, of many flagellated bacteria is a nonmonotonic function of the concentration, c, of high-molecular-weight linear polymers in aqueous solution, showing peaked v(c) curves. Pores in the polymer solution were suggested as the explanation. Quantifying this picture led to a theory that predicted peaked v(c) curves. Using high-throughput methods for characterizing motility, we measured v and the angular frequency of cell body rotation, Ω, of motile Escherichia coli as a function of polymer concentration in polyvinylpyrrolidone (PVP) and Ficoll solutions of different molecular weights. We find that nonmonotonic v(c) curves are typically due to low-molecular-weight impurities. After purification by dialysis, the measured v(c) and Ω(c) relations for all but the highest-molecular-weight PVP can be described in detail by Newtonian hydrodynamics. There is clear evidence for non-Newtonian effects in the highest-molecular-weight PVP solution. Calculations suggest that this is due to the fast-rotating flagella seeing a lower viscosity than the cell body, so that flagella can be seen as nano-rheometers for probing the non-Newtonian behavior of high polymer solutions on a molecular scale. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 50 |
| Volume Number | 111 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2014-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Escherichia Coli Physiology Flagella Models, Biological Movement Ficoll Hydrodynamics Povidone Rheology Viscosity Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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