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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...
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.

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Related Experiment Video

Updated: Jun 18, 2026

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
10:20

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules

Published on: September 5, 2019

Progress in single-molecule spectroscopy in cells.

Haw Yang1

  • 1Department of Chemistry, Princeton University, Princeton, NJ 08544, USA. hawyang@princeton.edu

Current Opinion in Chemical Biology
|November 10, 2009
PubMed
Summary
This summary is machine-generated.

Time-dependent single-molecule spectroscopy reveals molecular dynamics in real time, capturing transient cellular events missed by traditional methods. This technique enables direct observation of molecular machines within living cells.

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Last Updated: Jun 18, 2026

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Published on: June 9, 2010

Area of Science:

  • Biophysics
  • Molecular Biology
  • Cellular Dynamics

Background:

  • Conventional methods average molecular behavior, obscuring transient and stochastic events.
  • Understanding cellular responses requires real-time observation of molecular transformations.
  • Single-molecule spectroscopy offers a path to overcoming ensemble-averaging limitations.

Purpose of the Study:

  • To highlight the capabilities of time-dependent single-molecule spectroscopy.
  • To discuss its potential for observing molecular processes in living cells.
  • To explore advances enabling real-time molecular monitoring.

Main Methods:

  • Utilizing time-dependent single-molecule spectroscopy.
  • Employing advanced probe development and specific labeling strategies.
  • Leveraging sophisticated spectroscopy instrumentation.

Main Results:

  • Direct observation of molecular processes in real time is achievable.
  • Transient and stochastic molecular events can be captured.
  • Feasibility of monitoring single molecular machines within living cells is demonstrated.

Conclusions:

  • Time-dependent single-molecule spectroscopy provides unprecedented insight into molecular dynamics.
  • This technique is crucial for understanding the physical and chemical basis of cellular responses.
  • Recent technological advancements make in vivo single-molecule studies increasingly viable.