Primary processes in isolated bacterial reaction centers from Rhodobacter sphaeroides studied by picosecond fluorescence kinetics
✍ Scribed by Marc G. Müller; Kai Griebenow; Alfred R. Holzwarth
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 496 KB
- Volume
- 199
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Picosecond to nanosecond fluorescence kinetics as a function of emission wavelength is reported for isolated reaction centers of the purple bacterium R6. sphaeroides. New kinetic components of 12 ps and about 100 ps lifetime have been found in the fluorescence decay kinetics of the primary donor P*. Various kinetic models of the primary and secondary electron transfer processes are discussed which could possibly explain these new components. The data indicate either the necessity for more complex electron transfer schemes than assumed so far or a substantial heterogeneity in tbe rates of both the primary and secondary electron transfer steps.