Fluorescence detected magnetic resonance (FDMR) is used to investigate peridinin-chlorophyll-a protein (PCP), the peripheral antenna of the photosystem of Amphidinium carterae. Peridinin triplet resonances are obtained monitoring chlorophyll-a fluorescence in agreement with efficient energy transfer between the two pigments. Two sites are revealed for peridinin having slightly different triplet energy (about 190 cm-1), and D values averaging 0.045 cm-1. Spin exchange occurs between the two sites at a rate of about 5 x 10(7) exp(-67/T) s-1.
FDMR SPECTROSCOPY OF PERIDININ CHLOROPHYLL-A PROTEIN FROM AMPHIDINIUM-CARTERAE
CARBONERA, DONATELLA;GIACOMETTI, GIOVANNI;
1995
Abstract
Fluorescence detected magnetic resonance (FDMR) is used to investigate peridinin-chlorophyll-a protein (PCP), the peripheral antenna of the photosystem of Amphidinium carterae. Peridinin triplet resonances are obtained monitoring chlorophyll-a fluorescence in agreement with efficient energy transfer between the two pigments. Two sites are revealed for peridinin having slightly different triplet energy (about 190 cm-1), and D values averaging 0.045 cm-1. Spin exchange occurs between the two sites at a rate of about 5 x 10(7) exp(-67/T) s-1.
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