Open AccessExperimental examination of the “energy upconversion” theory for green plant photosynthesis
Author(s) -
Joseph T. Warden
Publication year - 1976
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.73.8.2773
Subject(s) - photon upconversion , photosynthesis , spinach , p700 , yield (engineering) , xenon , flash (photography) , resonance (particle physics) , photosystem i , chemistry , physics , astrophysics , botany , photosystem ii , optics , atomic physics , biology , thermodynamics , biochemistry , luminescence
Spinach chloroplasts, dark adapted for periods of three days to three months, yield P700+ formation (electron spin resonance signal 1) on the first as well as the following flashes in an actinic series of xenon light flashes of 10 μs duration. These data are in contradiction with the prediction of the “energy upconversion” theory [F. K. Fong (1975)Appl. Phys. 6, 151-156] that only the second flash would be effective.