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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Related Experiment Video

Updated: Jun 11, 2026

Fluorescence Biomembrane Force Probe: Concurrent Quantitation of Receptor-ligand Kinetics and Binding-induced Intracellular Signaling on a Single Cell
14:09

Fluorescence Biomembrane Force Probe: Concurrent Quantitation of Receptor-ligand Kinetics and Binding-induced Intracellular Signaling on a Single Cell

Published on: August 4, 2015

Force-fluorescence spectroscopy at the single-molecule level.

Ruobo Zhou1, Michael Schlierf, Taekjip Ha

  • 1Department of Physics and Center for the Physics of Living Cells, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA.

Methods in Enzymology
|July 15, 2010
PubMed
Summary
This summary is machine-generated.

This study combines optical tweezers with fluorescence spectroscopy to enhance single-molecule analysis. This powerful new approach improves spatial resolution for observing molecular dynamics in life sciences research.

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Last Updated: Jun 11, 2026

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Biochemistry

Background:

  • Single-molecule techniques are crucial for life sciences research.
  • Combining manipulation and observation methods can enhance insights.
  • Existing methods have limitations in low-force regimes.

Purpose of the Study:

  • To present a novel approach combining single-molecule optical tweezers and fluorescence spectroscopy.
  • To overcome the spatial resolution limitations of optical tweezers at low forces.
  • To enable detailed observation of molecular conformational changes.

Main Methods:

  • Utilizing single-molecule optical tweezers for mechanical manipulation and observation.
  • Integrating single-molecule fluorescence spectroscopy, specifically Förster resonance energy transfer (FRET).
  • Employing precisely placed fluorescent labels and sophisticated experimental design.

Main Results:

  • Achieved enhanced spatial resolution in the low piconewton force range.
  • Successfully observed nanometer fluctuations and internal conformational changes.
  • Demonstrated increased information extraction compared to standalone techniques.

Conclusions:

  • The combined technique offers superior capabilities for single-molecule studies.
  • This approach advances the understanding of molecular mechanisms in life sciences.
  • It provides a powerful tool for investigating biological systems at the molecular level.