Long-range and long-term interferometric tracking by static and dynamic force-clamp optical tweezers.

A. Guiggiani*, Bruno Torre, A. Contestabile, F. Benfenati, M. Basso, M. Vassalli, F. Difato

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Optical tweezers are recognized single-molecule technique to resolve forces and motion on the molecular scale. Complex biological phenomena, such as cell differentiation and locomotion, require long range tracking capabilities with nanometer resolution over an extended period, to resolve molecular processes on the cellular scale. Here we introduce a real-time control of the microscope stage position to perform long-term tracking, with sub-millisecond resolution, of a bead attached to a neuron, preserving sub-nanometer sensitivity on a spatial range of centimeters, seven orders of magnitude larger. Moreover, the suitability of the system is tested by time- modulating the force-clamp condition to study the role of statically and dynamically applied forces in neuronal differentiation.

Original languageEnglish (US)
Pages (from-to)22364-22376
Number of pages13
JournalOptics Express
Volume19
Issue number23
DOIs
StatePublished - Nov 7 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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