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Artist's representation of nanorobots.  Two images, one above the other.

Credit: Adriano Cavalcanti, CAN Center for Automation in Nanobiotech
Image Description

And researchers are now exploring tiny cellular scale mechanisms some of which use tiny propellers or flagella to move about in the bloodstream.

For more information:

Svidinenko. (2004). New nanorobotic ideas from Adriano Cavalcanti. Retrieved October 24, 2006 from http://www.nanonewsnet.com/index.php?module=pagesetter&func=viewpub&tid=4&pid=9

Avron, J. E., Gat, O. & Kenneth, O. (2004). Swimming microbots: Dissipation, optimal stroke and scaling. Retrieved October 24, 2006 from http://physics.technion.ac.il/~avron/files/pdf/optimal-swim-12.pdf

Genome News Network (2004 article)