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Related Concept Videos

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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Updated: Jun 10, 2026

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Modeling Active Particle Motion from Fluorescence Correlation Spectroscopy Data.

Miguel A Ramos-Docampo1, Cairui Duan2, Nanying Wang1

  • 1Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus, Denmark.

Analytical Chemistry
|June 9, 2026
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Summary
This summary is machine-generated.

Fluorescence correlation spectroscopy (FCS) in 3D complements 2D optical tracking for analyzing active colloids. Both methods reveal consistent motor dynamics, aiding transport property assessment.

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Area of Science:

  • Colloid and Interface Science
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Active colloids are engineered micro/nanomotors with diverse propulsion mechanisms.
  • Comparing 2D and 3D analysis techniques for active colloids is crucial but challenging.
  • Fluorescence correlation spectroscopy (FCS) offers a 3D volumetric approach.

Purpose of the Study:

  • To compare 3D FCS measurements with 2D optical tracking for active colloids.
  • To establish FCS detectability criteria for active colloids.
  • To quantify locomotion and distinguish between active and passive colloids.

Main Methods:

  • Utilized fluorescence correlation spectroscopy (FCS) for 3D particle motion analysis.
  • Employed standard 2D optical microscopy-based tracking.
  • Investigated three propulsion types: self-diffusiophoresis, bubble propulsion, and magnetic guidance.

Main Results:

  • FCS successfully quantified locomotion in single and mixed active/passive colloid populations.
  • Directed particle motion assessed by FCS yielded velocities comparable to optical tracking.
  • Consistent trends in motor dynamics were observed, though absolute diffusion coefficients differed.

Conclusions:

  • FCS is a reliable method for assessing active colloid transport properties with appropriate data treatment.
  • FCS and optical tracking are complementary, providing population-level and individual motor diffusivity, respectively.
  • This study bridges the gap between 2D and 3D analysis methods for active matter.