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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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Updated: Oct 22, 2025

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Tracking Multiple Diffusing Particles Using Information Optimal Control.

Samuel C Pinto1, Nicholas A Vickers1, Fatemeh Sharifi1

  • 1Mechanical Engineering, Boston University, Boston, MA 02215, USA.

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Summary
This summary is machine-generated.

This study introduces a dual-level laser scanning strategy to efficiently track multiple diffusing particles. The method optimizes laser trajectories for precise particle localization and minimizes position estimation errors in fluorescence microscopy.

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Area of Science:

  • Biophysics
  • Optical Microscopy
  • Control Theory

Background:

  • Tracking diffusing particles is crucial for understanding biological processes.
  • Laser scanning fluorescence microscopy offers high resolution but requires optimized scanning strategies.
  • Efficiently tracking multiple particles simultaneously presents a significant challenge.

Purpose of the Study:

  • To develop an optimized laser scanning strategy for tracking multiple diffusing particles.
  • To maximize information gain from fluorescence intensity signals for particle trajectory estimation.
  • To minimize position estimation errors while maintaining track of all particles.

Main Methods:

  • A two-level control scheme was implemented.
  • A lower-level extremum seeking controller tracks individual particles by seeking and orbiting.
  • A higher-level controller dynamically selects particles for observation to ensure efficient estimation.

Main Results:

  • The proposed method efficiently collects photons.
  • Simulations demonstrate successful tracking of multiple diffusing particles.
  • Low position estimation errors were achieved for all tracked particles.

Conclusions:

  • The developed dual-level laser scanning strategy effectively tracks multiple diffusing particles.
  • This approach enhances information acquisition in fluorescence microscopy.
  • It offers a robust solution for precise particle localization in dynamic biological systems.