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Fluorescence Lifetime Macro Imager for Biomedical Applications
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Wide-field fluorescence lifetime imaging with multi-anode detectors.

Roland Hartig1, Yury Prokazov, Evgeny Turbin

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Summary

We developed a new detector system for fluorescence lifetime imaging microscopy (FLIM) to study protein dynamics in living cells. This system enables precise measurement of Förster Resonance Energy Transfer (FRET) with high temporal resolution.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Microscopy

Background:

  • Fluorescence lifetime imaging microscopy (FLIM) is crucial for observing protein dynamics within living cells.
  • Existing FLIM techniques face challenges in precisely measuring fast photophysical processes like Förster Resonance Energy Transfer (FRET).

Purpose of the Study:

  • To present advancements in a positional sensitive wide-field single-photon counting detector system for FLIM.
  • To demonstrate the system's utility in FRET applications for studying intramolecular dynamics.

Main Methods:

  • Construction of a novel positional sensitive wide-field single-photon counting detector system.
  • Integration with a conventional fluorescence microscope and synchronized short-pulse lasers for minimal invasive illumination.
  • Acquisition of single-photon counting images to measure fluorescence lifetimes in the time domain.

Main Results:

  • The developed system successfully measures fluorescence lifetimes in living cells.
  • It accurately quantifies the transfer rate of fast photophysical processes, specifically FRET.
  • The system resolves complex fluorescence decay kinetics, indicating high temporal resolution.

Conclusions:

  • The new FLIM detector system offers a powerful tool for studying protein dynamics and FRET in real-time.
  • Its ability to perform long-term experiments with minimal invasiveness enhances cellular studies.
  • This advancement provides deeper insights into fast photophysical processes within biological systems.