Optical microscope image of a HeLa cell containing several gold-ruthenium nanomotors.

Optical microscope image of a HeLa cell containing several gold-ruthenium nanomotors.

Optical microscope image of a HeLa cell containing several gold-ruthenium nanomotors.

Optical microscope image of a HeLa cell containing several gold-ruthenium nanomotors. Arrows indicate the trajectories of the nanomotors, and the solid white line shows propulsion. Near the center of the image, a spindle of several nanomotors is spinning. Inset: Electron micrograph of a gold-ruthenium nanomotor. The scattering of sound waves from the two ends results in propulsion.

Image: Mallouk Lab/ Penn State
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