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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
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Cortical Actin Flow in T Cells Quantified by Spatio-temporal Image Correlation Spectroscopy of Structured Illumination Microscopy Data
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Fourier imaging correlation spectroscopy for cellular structure-function.

Eric N Senning1, Geoffrey A Lott, Andrew H Marcus

  • 1Department of Chemistry, Oregon Center for Optics, University of Oregon, Eugene, Oregon 970403, USA.

Methods in Cell Biology
|February 7, 2009
PubMed
Summary
This summary is machine-generated.

Fourier imaging correlation spectroscopy (FICS) offers a novel way to optically probe molecular dynamics in living cells. This phase-selective fluorescence method enhances signal levels for detailed molecular trajectory analysis.

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Area of Science:

  • Biophysics
  • Cellular Dynamics
  • Spectroscopy

Background:

  • Studying intracellular species dynamics is crucial for understanding biochemical processes.
  • Optical probing of macromolecular motion in living cells requires advanced techniques.

Purpose of the Study:

  • To review Fourier imaging correlation spectroscopy (FICS) as a novel method for probing molecular dynamics.
  • To highlight FICS's ability to measure collective coordinate fluctuations of fluorescent species.

Main Methods:

  • Fourier imaging correlation spectroscopy (FICS) utilizes a phase-selective approach.
  • A spatially modulated optical grating excites fluorescently labeled samples.
  • Phase-synchronous detection monitors fluctuations of partially averaged spatial coordinates.

Main Results:

  • FICS measures collective coordinate fluctuations from large populations (N ≈ 10^6) of fluorescent species.
  • Two-point space-time correlation functions and probability distributions are constructed from FICS data.
  • FICS balances signal-to-noise ratio with information content.

Conclusions:

  • FICS provides a route to elevate signal levels in fluorescence fluctuation spectroscopy.
  • The technique offers detailed information about molecular coordinate trajectories.
  • FICS enables advanced studies of biochemical mechanisms in living cells.