Optically-controllable, micron-sized motor based on live cells

Gudipati, M. ; D'Souza, J. ; Dharmadhikari, J. ; Dharmadhikari, A. ; Rao, B. ; Mathur, D. (2005) Optically-controllable, micron-sized motor based on live cells Optics Express, 13 (5). pp. 1555-1560. ISSN 1094-4087

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Official URL: http://www.opticsinfobase.org/abstract.cfm?URI=oe-...

Related URL: http://dx.doi.org/10.1364/OPEX.13.001555


We demonstrate rotation of live Chlamydomonas reinhardtii cells in an optical trap; the speed and direction of rotation are amenable to control by varying the optical trapping force. Cells rotate with a frequency of 60-100 rpm; functional flagella are shown to play a decisive role in rotation. The rotating cells generate torque (typically ~7500-12000 pN nm) that is much larger than that generated chemically by a dynein head in vitro (40 pN nm). The total force associated with a rotating live cell (~10 pN) suggests that activity of only a small fraction (~5%) of dynein molecules per beat cycle is sufficient to generate flagellar motion.

Item Type:Article
Source:Copyright of this article belongs to Optical Society of America.
ID Code:77592
Deposited On:13 Jan 2012 11:42
Last Modified:13 Jan 2012 11:42

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