RAPID REDUCTION OF P-700 PHOTOOXIDIZED BY A FLASH AT LOW TEMPERATURE IN SPINACH CHLOROPLASTS

Autor:	H. Conjeaud, P. Mathis
Rok vydání:	1979
Předmět:	Chemistry Electron donor General Medicine Electron Photochemistry Photosystem I Biochemistry Chloroplast chemistry.chemical_compound Phase (matter) Physical and Theoretical Chemistry Absorption (chemistry) Quantum tunnelling Excitation
Zdroj:	Photochemistry and Photobiology. 29:833-837
ISSN:	1751-1097 0031-8655
DOI:	10.1111/j.1751-1097.1979.tb07774.x
Popis:	—Excitation of chloroplasts at low temperature (down to 4.2 K) by short laser flashes causes largely reversible absorption changes which are attributed to the photooxidation of P-700, the primary electron donor of Photosystem I. At temperatures below 100 K the dark re-reduction of P-700+ is biphasic. with half-times of about 122μs and 1.7 ms. The relative contribution of the two phases varies with temperature with the fast phase becoming dominant at the lowest temperatures (˜90% at 5 K). The results are interpreted in terms of tunnelling of the electron from one or two primary accepting sites back to P-700, a process which is largely dominant over the process of charge stabilisation.
Databáze:	OpenAIRE
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