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Berlin 2018 – scientific programme

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BP: Fachverband Biologische Physik

BP 23: Bioimaging and Biopspectroscopy II

BP 23.4: Talk

Wednesday, March 14, 2018, 15:45–16:00, H 2013

Characterisation of Metabolic Dynamics by Fluorescence Lifetime Imaging Microscopy of NAD(P)H — •André Weber1, Yury Prokazov1, Marcus Hauser2, and Werner Zuschratter11Leibniz-Institut für Neurobiologie Magdeburg, Germany — 2Institut für Biometrie und Medizinische Informatik, Otto-von-Guericke- Universität Magdeburg, Germany

The energy metabolism of eucaryotic cells can show complex dynamics, i.e. glycolytic oscillations. Monitoring this intrinsic behaviour by fluorescence microscopy is influence the metabolism, which is sensitive to excitation light intensities, especially in UV range.

We show a low light imaging approach using a single photon counting position sensitive detector working with laser intensities below 3mW/cm2 and a time resolution below 90ps. For excitation of intracellular NAD(P)H a 8 MHz pulsed frequency-tripled Nd:vanadate laser tuned at 355 nm was used. The analysis of the complex fluorescence decay of NAD(P)H in intact yeast cells revealed 4 molecular species with characteristic fluorescence lifetimes showing individual behaviour and glycolytic oscillations as response to glucose addition. Laser intensities higher 3mW/cm2 did not lead to long lasting glycolytic oscillations.

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