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1978 (1)
1975 (1)
1Author    Christian Holzapfel, Robert BauerRequires cookie*
 Title    Computer Simulation of Primary Photosynthetic Reactions — Compared with Experimental Results on 0 2-Exchange and Chlorophyll Fluorescence of Green Plants  
 Abstract    A computer model describing the "Z-scheme" of photosynthetic electron transport in terms of reduction and oxydation of coupled redox pools was built up. Starting from a certain initial state corresponding to the dark adapted state of the photosynthetic system the reduction and reoxidation levels of the pools were calculated during adaptation of the system to a steady state in the light. The changes of calculated redox levels were compared with experimental results of fluorescence and oxygen evolution induction curves. It is shown that the transients in prompt fluorescence and oxygen evolution can be described by reduction and reoxidation of the primary electron acceptor pool and the electron donor pool of photosystem II due to reduction and oxidation of the other pools during adaptation to light. The first depression D in the fluorescence induction curve is explained by the existence of a redox pool X between the primary electron acceptor pool Q of photosystem II and plastoquinone. It is shown that DCMU blocks the electron flow between Q and X. Furthermore, it is shown that the inhibitor DBMIB probably not only blocks the electron flow but also causes a successive disconnection of the plastoquinone pool from the electron transport chain. 
  Reference    (Z. Naturforsch. 30c, 489—498 [1975]; received March 3/April 18 1975) 
  Published    1975 
  Keywords    Primary Photosynthetic Electron Transport, Computer Simulation, Fluorescence Induction, Oxygen Exchange Transient 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0489.pdf 
 Identifier    ZNC-1975-30c-0489 
 Volume    30 
2Author    Christian HolzapfelRequires cookie*
 Title    Analysis of the Prompt Fluorescence Induction by Means of Computer Simulation of the Primary Photosynthetic Reactions  
 Abstract    The induction phenomenon of prompt fluorescence of the photosynthetic system in green plants reflects the adaptation of the electron transport system from a dark adapted state to a steady state under light condition. The appearance of the P-peak in the prompt fluorescence induction curve is explained by the decay of the electrochemical gradient across the thylakoid membrane in the dark. The decay of the electrochemical gradient in the dark is calculated using measured fluorescence induction curves with different times of dark adaptation. The influence of photophosphorylation inhibitors is discussed and the threshold effect of ATP-formation depending on the electrochemical gradient is explained by the coupling of the ATP-formation with the electron transport in the thylakoid membrane. 
  Reference    Z. Naturforsch. 33c, 402—2 (1978); received April 17 1978 
  Published    1978 
  Keywords    Primary Photosynthetic Electron Transport, Computer Simulation, Fluorescence Induction, ATP-Formation 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0402.pdf 
 Identifier    ZNC-1978-33c-0402 
 Volume    33