Energy transfer kinetics of phycoerythrocyanins (PECs) from the cyanobacteriumAnabaena variabilis (I)
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The exritation energy transfer processes in monomeric phycoerythrocyanins (PEC) have been studied in detail using steady-state and time-resolved fluorescence spectra techniques as well as the deconvolution tech-nique of spectra. The results indicate that the energy transfer processes should take place between α84,-PVB and β84- or β155-PCB chromophores. the time constants of energy transfer are 34.7 and 130 ps individually; the component with lifetime of 1.57 ns originates from the fluorescence lifetime of the terminal emitter of β84- and /or β155 -PCB chro-mophores; and the component with lifetime of 515 ps might be assigned to the energy transfer between two PCB chro-mophores of β subunit.
Keywordsphycobilisome phycoerythrocyanin deconvolution spectrum time-resolved fluorescence energy transfer
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