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Single Bacterial Cell Detection With Nonlinear Rotational Frequency Shifts Of Driven Magnetic Microspheres

B. McNaughton, Rodney R. Agayan, R. Clarke, R. Smith, R. Kopelman
Published 2007 · Physics, Materials Science

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Shifts in the nonlinear rotational frequency of magnetic microspheres, driven by an external magnetic field, offer a dynamic approach for the detection of single bacterial cells. We demonstrate this capability by optically measuring such frequency shifts when an Escherichia coli attaches to the surface of a 2.0μm magnetic microsphere, thereby affecting the drag of the system. From this change in drag, the nonlinear rotation rate was reduced, on average, by a factor of 3.8. Sequential bacterial cell attachments were also monitored.
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