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'Watersplitting' in keywords Facet   section ZfN Section C  [X]
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1978 (1)
1975 (1)
1Author    JaneM. Bowes, AntonyR. CroftsRequires cookie*
 Title    Interactions of Protons with Transitions of the Watersplitting Enzyme of Photosystem II as Measured by Delayed Fluorescence  
 Abstract    By measuring ms delayed fluorescence emission, we have investigated the interaction of protons in the reactions of the watersplitting enzyme of photosystem II. (1) In the presence of the electron transport mediators 2,3,5,6-tetramethyl-p-phenylene diamine (DAD) (in its reduced form) and methyl viologen and of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), the maximal intensity of the delayed fluorescence measured between 1 and 1.5m s after illumination was greater than the level reached in the presence of DCMU alone. (2) The stimulation of the delayed fluorescence was greater when the suspension was pre­ 
  Reference    Z. Naturforsch. 33c, 271 (1978); received February 13 1978 
  Published    1978 
  Keywords    Photosystem II, Watersplitting, Protons, Delayed Fluorescence 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0271.pdf 
 Identifier    ZNC-1978-33c-0271 
 Volume    33 
2Author    Ulrich Schreiber, K. Onrad, Colbow\., WilliamV. IdaverRequires cookie*
 Title    Tem perature — Jump Chlorophyll F luorescence Induction in Plants  
 Abstract    In contrast to slower heating rates, a temperature jump reveals complex rise phases in the heat induced chlorophyll fluorescence emission increase in intact plants. Three rise phases have been detected which indicate the stepwise loss of different quenching mechanism of system II fluorescence. Two of the phases appear to reflect heat deactivation of the system II reaction centers, while the other may be as­ sociated with the induction of hydrogenase activity. Varia­ tions in T max of the jump, for the increase in different plant varieties, suggest a correlation with membrane lipid phase transitions affecting thylakoid membrane structure and the fluorescence increase. Chlorophyll fluorescence has been a valuable in ­ dicator for the state and functioning of the photo-synthetic apparatus (for a review, cf. ref. 1). 
  Reference    (Z. Naturforsch. 30c, 689—690 [1975]; received May 12 1975) 
  Published    1975 
  Keywords    Chlorophyll Fluorescence, Temperature Jump, Heat Deacti­ vation, Watersplitting, Enzyme System, Lipid Phase Transition 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0689_n.pdf 
 Identifier    ZNC-1975-30c-0689_n 
 Volume    30