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Nat Methods. 2007 Mar;4(3):223-5. Epub 2007 Feb 25.

Nanofabricated quartz cylinders for angular trapping: DNA supercoiling torque detection.

Author information

1
Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.

Abstract

We designed and created nanofabricated quartz cylinders well suited for torque application and detection in an angular optical trap. We made the cylinder axis perpendicular to the extraordinary axis of the quartz crystal and chemically functionalized only one end of each cylinder for attachment to a DNA molecule. We directly measured the torque on a single DNA molecule as it underwent a phase transition from B-form to supercoiled P-form.

PMID:
17322891
DOI:
10.1038/nmeth1013
[Indexed for MEDLINE]
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