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1988 (2)
1985 (1)
1Author    Éva Hideg, Sándor DemeterRequires cookie*
 Title    Thermoluminescence and Delayed Luminescence Characterization of Photosystem II a and Photosystem II p Reaction Centers  
 Abstract    The thermoluminescence and delayed luminescence characteristics of PS II" and PS IIp centers were investigated in BBY particles and stroma thylakoids, respectively. The BBY particles exhib-ited a thermoluminescence band at 25 °C (B band) which was associated with the charge recombi-nation of the S 2 Qb" redox couple and underwent period-2 oscillation in a sequence of flashes. In the flash-induced decay of delayed luminescence of BBY particles a component with a half-time of 34 s corresponded to the B thermoluminescence band and was also assigned to S2OB charge recombination. No corresponding thermoluminescence or delayed luminescence components as-sociated with the secondary acceptor OB could be observed in the glow curve or delayed lumines-cence decay of stroma thylakoids. These observations indicate that unlike PS IIa the PS Hp centers are not associated with the two-electron gate, 0B. 
  Reference    Z. Naturforsch. 43c, 596—600 (1988); received May 2 1988 
  Published    1988 
  Keywords    Photosynthesis, Photosystem II, Thermoluminescence, Delayed Luminescence 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0596.pdf 
 Identifier    ZNC-1988-43c-0596 
 Volume    43 
2Author    Imre Vass, Narendranath Mohanty, Sándor DemeterRequires cookie*
 Title    Photoinhibition of Electron Transport Activity of Photosystem II in Isolated Thylakoids Studied by Thermoluminescence and Delayed Luminescence  
 Abstract    The effect of photoinhibition on the primary (Oa) and secondary (Ob) quinone acceptors of photosystem II was investigated in isolated spinach thylakoids by the methods of thermolumines-cence and delayed luminescence. The amplitudes of the Q (at about 2 °C) and B (at about 30 °C) thermoluminescence bands which are associated with the recombination of the S;OA and S2QB charge pairs, respectively, exhibited parallel decay courses during photoinhibitory treatment. Similarly, the amplitudes of the flash-induced delayed luminescence components ascribed to the recombination of S 2 0A and S 2 OB charge pairs and having half life-times of about 3 s and 30 s, respectively, declined in parallel with the amplitudes of the corresponding Q and B thermo-luminescence bands. The course of inhibition of thermoluminescence and delayed luminescence intensity was parallel with that of the rate of oxygen evolution. The peak positions of the B and Q thermoluminescence bands as well as the half life-times of the corresponding delayed lumines-cence components were not affected by photoinhibition. These results indicate that in isolated thylakoids neither the amount nor the stability of the reduced OB acceptor is preferentially decreased by photoinhibition. We conclude that either the primary target of photodamage is located before the Ob binding site in the reaction center of photosystem II or QA and OB undergo simultaneous damage. 
  Reference    Z. Naturforsch. 43c, 871—876 (1988); received August 12 1988 
  Published    1988 
  Keywords    Photosynthesis, Photoinhibition, Photosystem II, Thermoluminescence, Delayed Luminescence 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0871.pdf 
 Identifier    ZNC-1988-43c-0871 
 Volume    43 
3Author    É. Va, H. Ideg, SándorD. Em EterRequires cookie*
 Title    Binary Oscillation of Delayed Luminescence: Evidence of the Participation of Qb in the Charge Recombination  
 Abstract    The flash-induced oscillation of a slowly decaying component of delayed luminescence (half time ~ 42 s) was investigated in spinach chloroplasts for various redox states of the secondary acceptor pool (Q B)-In preilluminated chloroplasts (30 s light followed by 5 min dark) the slow component exhibited a period-4 oscillation as a function of flash number. Upon oxidation of a major part of the QB pool by dark-adaptation or by ferricyanide treatment of chloroplasts, the period-4 oscillation was converted into a period-2 oscillation, providing direct experimental evi­ dence of the participation of QB in the charge recombination reaction. The measured oscillatory patterns could be simulated in model calculations by assuming that the slow component originates from charge recombination of the redox couples S2Q| 
  Reference    Z. Naturforsch. 40c, 827—831 (1985); received May 23/July 24 1985 
  Published    1985 
  Keywords    Delayed Luminescence, Oscillation, Oxygen Evolution, Secondary Quinone Acceptor, Chloroplast 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0827.pdf 
 Identifier    ZNC-1985-40c-0827 
 Volume    40