ENERGY TRANSFER FROM ENZYME-GENERATED TRIPLET CARBONYLS TO THYLAKOID MEMBRANE FRACTIONS ENRICHED IN PHOTOSYSTEMS I and II |
| |
| Authors: | Lilian Nassi Giuseppe Cilento |
| |
| Institution: | Department of Biochemistry, Instituto de Quìmica, Universidade de São Paulo, C.P. 20.780, São Paulo, Brazil |
| |
| Abstract: | Abstract— Enzyme-generated triplet species transfer energy very efficiently to thylakoid membrane fractions enriched in either photosystem-I or photosystem-II. Independent of the nature of the triplet donor, the emission is always more intense with photosystem-I. Since the fluorescence quantum yield of chlorophyll in PS-I is lower and the rate of energy transfer usually smaller than to chlorophyll in PS-II, the yield of 1S chlorophylls in PS-I is substantially higher. This is tentatively attributed to more favorable reverse intersystem crossing from an upper triplet state in PS-I. |
| |
| Keywords: | |
|
|
