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Related Experiment Videos

Luminescence lifetimes in biological systems

D Phillips1

  • 1Department of Chemistry, Imperial College, London, UK.

The Analyst
|April 1, 1994
PubMed
Summary

Photo-luminescence techniques reveal molecular environments in biological systems. Advanced methods like time-resolved fluorescence spectroscopy and imaging offer new insights into cellular and tissue dynamics.

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Area of Science:

  • Biophysical Chemistry
  • Molecular Biology
  • Spectroscopy

Background:

  • Photo-luminescence, encompassing fluorescence and phosphorescence, serves as a sensitive probe for molecular environments.
  • Applications in biological systems are widespread, aiding in understanding polarity, micro-viscosity, and molecular mobility.
  • Modern laser-based techniques have advanced the measurement capabilities for these phenomena.

Purpose of the Study:

  • To outline modern laser-based techniques for photo-luminescence measurements.
  • To present recent results and applications in various biological systems.
  • To highlight advancements in fluorescence spectroscopy and imaging for biological research.

Main Methods:

  • Measurement of fluorescence decay times (nanosecond to picosecond).
  • Time-gated fluorescence spectra and anisotropy measurements.
  • Time-resolved evanescent wave-induced fluorescence spectroscopy for surface studies.
  • Three-dimensional confocal and time-resolved fluorescence imaging.

Main Results:

  • Demonstrated application of anisotropy measurements to enzyme studies (subtilisin) and lipid bilayers.
  • Utilized time-resolved evanescent wave-induced fluorescence to study surface-adsorbed proteins (bovine serum albumin).
  • Presented results on fluorescence decay in living cells and time-gated imaging in tissues.

Conclusions:

  • Advanced photo-luminescence techniques provide powerful tools for probing biological systems at molecular and cellular levels.
  • Time-resolved fluorescence spectroscopy and imaging offer significant potential for detailed biological and medical applications.
  • These methods enable in-depth studies of molecular dynamics, surface interactions, and cellular processes.

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