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1997 (1)
1Author    SeymourSteven Brody, George Papageorgiou, Katerina Alygizaki-ZorbaRequires cookie*
 Title    Photodynamic Action of Hypericin on Cyanobacteria, Synechocystis and Synechoccus (Anacystis nidulans)  
 Abstract    The photodynamic action of hypericin on photosynthesis and respiration were monitored in Synechocystis sp PCC 6803 and Synechoccus A TC C 6311 (Anacystis nidulans). An oxygen electrode was used to measure net oxygen evolution or consumption. The amount o f hyperi­ cin required to inhibit photosynthesis was quantitively determined. Photosynthesis was com­ pletely inhibited in Synechocystis when the molar ratio of chlorophyll/hypericin was about 70:1. Higher concentrations o f hypericin did not stop the uptake of oxygen, but rather stim­ ulated the process in the light. Hypericin was readily washed out o f the cells forming no permanent associations in the bacterial cell. Hypericin inhibited electron transfer and conse­ quently oxygen production by PSII particles. For half maximum inhibition o f oxygen evolu­ tion, with PSII membrane particles, the molar ratio of chlorophyll/hypericin was about 10:1. 
  Reference    Z. Naturforsch. 52c, 165—168 (1997); received November 14. 1996/January 15 1997 
  Published    1997 
  Keywords    Hypericin, Cyanobacteria, Photosynthesis, Photodynamic Action 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0165.pdf 
 Identifier    ZNC-1997-52c-0165 
 Volume    52