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Antenna radical cation

As indicated in Figure I, wild-type bacterial reaction centers also contain a carotenoid polyene. This polyene is not involved as a donor or acceptor in the normal electron transfer sequence, although carotenoid radical cations have been observed spectroscopically in photosynthetic preparations under certain conditions [18,19]. In many of the artificial photosynthetic systems which will be discussed below, the carotenoid is used as a convenient secondary electron donor. Carotenoids do perform two important functions in photosynthesis. They provide photoprotection from singlet oxygen damage, and act as light-gathering antennas for the special pair (see Sections III and IV). [Pg.5]

In the case of the carotenoid-containing LH2 complex, the triplet states of BChl a and carotenoid (spheroidene) were generated immediately after excitation, but the triplet-state BChl a was quenched efficiently by the carotenoid so that no BChl a cation-radical was generated. Thus, the photoprotective function of the carotenoid in this antenna complex has been proven. [Pg.190]


See other pages where Antenna radical cation is mentioned: [Pg.356]    [Pg.189]    [Pg.190]    [Pg.396]    [Pg.466]    [Pg.300]    [Pg.300]    [Pg.641]    [Pg.153]    [Pg.1717]    [Pg.300]    [Pg.716]    [Pg.133]    [Pg.402]    [Pg.197]    [Pg.212]    [Pg.2538]    [Pg.8]    [Pg.109]   
See also in sourсe #XX -- [ Pg.52 ]




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Antennae

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