| | 1 | Author
| SeymourSteven Brody, George Papageorgiou, Katerina Alygizaki-Zorba | Requires 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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| default:Reihe_C/52/ZNC-1997-52c-0165.pdf | | | | Identifier
| ZNC-1997-52c-0165 | | | | Volume
| 52 | |
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