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PHOTOSYNTHETIC OXYGEN EVOLUTION UNDER VARYING REDOX CONDITIONS: NEW EXPERIMENTAL AND THEORETICAL RESULTS
Author(s) -
Greenbaum Elias
Publication year - 1977
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.1751-1097.1977.tb06913.x
Subject(s) - yield (engineering) , redox , photosynthesis , chemistry , hydroquinone , oxygen , oxygen evolution , thermodynamics , quinone , constant (computer programming) , monotonic function , flash (photography) , electrochemistry , physics , mathematics , inorganic chemistry , stereochemistry , mathematical analysis , electrode , biochemistry , organic chemistry , computer science , optics , programming language
— The oxygen yield per flash of Chlorella in the presence of redox components such as benzo‐quinone, hydroquinone, Fe(CN)B ‐ and IrC12 ‐ ‐ has been studied in an atmosphere of 10ppm 0 2 . When oxidants are added to the cells, the familiar Joliot‐Kok oscillations with maximum yield on the third flash and periodicity four are observed. As hydroquinone is progressively added, the oscillations fade out and the steady state decreases. The pattern of O 2 evolution approaches a monotonic climb to the steady state with no obvious oscillatory behavior. A novel method for analyzing this data has been developed. A simple fourth order linear difference equation with constant coefficients is presented. This equation is capable of describing the systematic transition from oscillatory to monotonic O 2 yield.