Energy storage in the photosynthetic electron-transport chain: An analogy with Michaelis-Menten kinetics | Zendy

Dejan Marković | Zendy

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Energy storage in the photosynthetic electron-transport chain: An analogy with Michaelis-Menten kinetics

Author(s) -

Dejan Marković

Publication year - 2003

Publication title -

journal of the serbian chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.227

H-Index - 45

eISSN - 1820-7421

pISSN - 0352-5139

DOI - 10.2298/jsc0309615m

Subject(s) - thylakoid , kinetics , electron transport chain , photoinhibition , photoacoustic imaging in biomedicine , fluorescence , photosynthesis , chemistry , light energy , photosynthetic reaction centre , electron transfer , saturation (graph theory) , photochemistry , biophysics , photosystem ii , physics , optics , biochemistry , biology , chloroplast , mathematics , quantum mechanics , combinatorics , gene

Simultaneous measurements of fluorescence and thermal emission have been per- formed by applying combined fluorescence and photoacoustic techniques on isolated thylakoids pretreated by prolonged illumination with saturating light. The traces were used to create Lineweaver-Burk type plots, proving clearly at least a formal analogy between the kinetics of the mechanisms governing fluorescence and thermal emission from isolated thylakoids and Michaelis-Menten kinetics of enzymatic reactions. Two characteristic pa- rameters were calculated from them (energy storage and half-saturation light intensity) in or- der to obtain a basic, initial response of the photosynthetic apparatus functioning under pho- toinhibition stress. Keywods: photosynthetic electron-transport, reaction centers, energy storage, fluorescence, thermal emission.

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