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Proceedings Paper

Twisting biological objects by optical tweezers
Author(s): Pal Ormos; Herbert van Amerongen; Sandor Bottka; Peter Galajda; Gyozo Garab; Huba Kirei; Laszlo Oroszi
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Paper Abstract

We describe a novel method by which it is possible to apply and measure torque directly on particles grabbed in optical tweezers. It can be used to orient particles of micron size or even on single molecules, biopolymers by the use of test particles. The procedure is based on the observation that flat objects are oriented in an optical trap formed by linearly polarized light. The orienting torque originates from the anisotropic scattering of polarized light by the trapped particle. The phenomenon is characterized in detail, the physics is analysed. A tool is developed that exploits this effect to manuipulate biological macromolecules. Microscopic particles are produced by photopolymerisation that exploit this orientation effect and by which the torque is applied upon the biological object. In our system the applied torque can be turned on and off, it is controlled independently of the grabbing force of the tweezers during the manipulation process. The capabilities of the method are demonstrated. The method has great promise for application on DNA, DNA-protein complexes, actin filaments and other biopolymers.

Paper Details

Date Published: 18 October 2004
PDF: 8 pages
Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004); doi: 10.1117/12.558685
Show Author Affiliations
Pal Ormos, Biological Research Ctr. (Hungary)
Herbert van Amerongen, Wageningen Univ. (Netherlands)
Sandor Bottka, Biological Research Ctr. (Hungary)
Peter Galajda, Biological Research Ctr. (Hungary)
Gyozo Garab, Biological Research Ctr. (Hungary)
Huba Kirei, Biological Research Ctr. (Hungary)
Laszlo Oroszi, Biological Research Ctr. (Hungary)

Published in SPIE Proceedings Vol. 5514:
Optical Trapping and Optical Micromanipulation
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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