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Proceedings Paper

A wide-field multi-parameter FLIM and FRAP setup to investigate the fluorescence emission of individual living cyanobacteria
Author(s): Marco Vitali; Matthias Reis; Thomas Friedrich; Hann-Jörg Eckert
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Paper Abstract

Multi-parameter fluorescence lifetime imaging microscopy is a powerful tool to investigate the spatial dependence of the fluorescence decay signal of chromophores in living cells. A multi-channel detection system based on a position sensitive Quadrant Anode photomultiplier and time-correlated single photon counting (TCSPC) was applied to monitor the fluorescence decay in individual living cells of the cyanobacterium Thermosynechococcus elongatus. The fluorescence lifetime imaging system was used to detect at a frame-rate of 1 Hertz the recovery after photobleaching of Phycobilisomes (PBS), a photosynthetic pigment-protein complex with light harvesting functions. Simultaneous monitoring of the fluorescence decays of the PBS- and the Chlorophyll a (Chl a)-containing antenna systems unveils a heterogeneity of the cyanobacterial population with respect to the fluorescence lifetime. Furthermore the FLIM images clearly show that the decay of the fluorescence signal in the targeted area becomes longer after the bleaching at 633 nm for the whole measuring time. The results suggest that the diffusing PBSs, which replace the bleached ones in the targeted area, can only partially reestablish excitation energy transfer to Chl a.

Paper Details

Date Published: 24 November 2010
PDF: 6 pages
Proc. SPIE 7376, Laser Applications in Life Sciences, 737610 (24 November 2010); doi: 10.1117/12.871520
Show Author Affiliations
Marco Vitali, Technische Univ. Berlin (Germany)
Matthias Reis, Technische Univ. Berlin (Germany)
Thomas Friedrich, Technische Univ. Berlin (Germany)
Hann-Jörg Eckert, Technische Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 7376:
Laser Applications in Life Sciences
Matti Kinnunen; Risto Myllylä, Editor(s)

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