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‘UPHILL’ ENERGY TRANSFER IN A PHOTOSYNTHETIC BACTERIUM *
Author(s) -
Zankel Kenneth L.,
Clayton Roderick K.
Publication year - 1969
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1969.tb05905.x
Subject(s) - monochromatic color , wavelength , fluorescence , energy transfer , energy flow , physics , transfer (computing) , photoelectric effect , optics , atomic physics , chemistry , energy (signal processing) , quantum mechanics , parallel computing , computer science
— Detectable energy flow in the ‘uphill’ direction was demonstrated by exciting the fluorescence of a shorter wavelength band of Rhodopseudomonas spheroides with light absorbed by a longer wavelength band. A variation in the fluorescence spectrum which depends on the state of the traps was also demonstrated. This information, coupled with fluorescence data obtained with monochromatic light, leads to the conclusion that for the longest wavelength bands the ‘uphill’ transfer is about as fast as transfer to the traps; i.e. the ‘average’ rate constant is on the order of 10 9 sec. The ratio of the uphill to downhill rate agrees with a theoretical estimate of about 0·5. Some possible ramifications of such uphill flow are discussed.