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1997 (2)
1995 (1)
1Author    W. I. Gruszecki3, K. Strzałkab, A. Radunzc, G. H. SchmidcRequires cookie*
 Title    Cyclic Electron Flow Around Photosystem II as Examined by Photosynthetic Oxygen Evolution Induced by Short Light Flashes  
 Abstract    Photosynthetic oxygen evolution from photosystem II particles was analyzed as conse­ quence o f a train o f short (5 ^is) flashes of different light quality and different intensities to study cyclic electron flow around photosystem II. Damped oscillations of the amplitudes of 0 2-evolution corresponding to a flash sequence were fitted numerically and analyzed in terms o f a nonhomogeneous distribution of misses, represented by the probability parameter ctj. Application o f red light, known to promote cyclic electron flow around photosystem II (Grus­ zecki et al., 1995) results in a considerable increase of all a{, indicating that at the molecular level the misses may be interpreted as resulting from a competition for the reduction of oxidized P680 between cyclic electron flow and the electron flow coming from the water splitting enzyme. In accordance with previous findings, application of light flashes of the spectrum covering the absorption region of carotenoids resulted in an inhibition o f cyclic electron flow and a pronounced decrease of the level of the miss parameter. Possible molecu­ lar mechanisms for the activity control of this cyclic electron transport around photosystem II by carotenoids are discussed. 
  Reference    Z. Naturforsch. 52c, 175—179 (1997); received November 24 1996/ 
  Published    1997 
  Keywords    Cyclic Electron Transport, Photosystem II Oxygen Evolution, Light Flashes, Carotenoids 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0175.pdf 
 Identifier    ZNC-1997-52c-0175 
 Volume    52 
2Author    W. I. Gruszecki3, K. Strzałkab, A. R. Adunzc, J. K. Rukb, G. H. SchmidcRequires cookie*
 Title    Blue Light-Enhanced Photosynthetic Oxygen Evolution from Liposome-Bound Photosystem II Particles; Possible Role of the Xanthophyll Cycle in the Regulation of Cyclic Electron Flow Around Photosystem II?  
 Abstract    Light-driven electron transport in liposom e-bound photosystem II (PS-II) particles be­ tween water and ferricyanide was monitored by bare platinum electrode oxymetry. The m odi­ fication of the experimental system with the exogenous quinones a-tocopherol quinone (a-TQ) or plastoquinone (PQ) resulted in a pronounced effect on photosynthetic oxygen evolution. The presence o f a-tocopherolquinone (a-T Q) in PS-II samples decreased the rate of red light-induced oxygen evolution but increased the rate o f green light-induced oxygen evolution. Blue light applied to the assay system in which oxygen evolution was saturated by red light resulted in a further increase o f the oxygen signal. These findings are interpreted in terms of a cyclic electron transport around PS-II, regulated by an excitation state of ß-carotene in the reaction centre of PS-II. A mechanism is postulated according to which energetic coupling of ß-carotene in the reaction centre of PS-II and that o f other antenna carotenoid pigments is regulated by the portion of the xanthophyll violaxanthin, which is under control of the xanthophyll cycle. 
  Reference    Z. Naturforsch. 50c, 61—6 (1995); received June 15/November 11 1994 
  Published    1995 
  Keywords    a-Tocopherol Quinone, Plastoquinone-9, Oxygen Evolution, Photosystem II, Cyclic Electron Transport, Xanthophyll Cycle 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0061.pdf 
 Identifier    ZNC-1995-50c-0061 
 Volume    50 
3Author    J. K. Ru K, K. B., Rd Ab>, A. R. Adunzc, K. Strzałka3, G. H. SchmRequires cookie*
 Title    Antagonistic Effects of a-Tocopherol and a-Tocoquinone in the Regulation of Cyclic Electron Transport around Photosystem II  
  Reference    Z. Naturforsch. 52c, 766—774 (1997); received August 22/ 
  Published    1997 
  Keywords    a-Tocopherol, a-Tocoquinone, Plastoquinone-A, Photosystem II, Cyclic Electron Transport, Oxygen Evolution, Thylakoid Membrane 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0766.pdf 
 Identifier    ZNC-1997-52c-0766 
 Volume    52