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Accueil > Séminaires > Année 2013 > Séminaire Ryszard Jankowiak (13 juin 2013)

Séminaire Ryszard Jankowiak (13 juin 2013)

Chemistry and Physics Departments, Kansas State University, Manhattan, USA

Excitation Energy Transfer and Charge Separation Processes in Photosynthetic Complexes

I will present basic aspects of oxygenic photosynthesis along with a brief discussion of persistent and transient hole-burned (HB) spectra (and the information they provide) obtained for various photosynthetic complexes. Examples include reaction centers (RCs) containing zinc-bacteriochlorophylls (Zn-BChls), Photosystem II (PSII) RCs from Chlamydomonas reinhardtii, and CP29 antenna protein complex of PSII. Regarding bacterial RCs, the shape of the spectral density and the strength of electron-phonon coupling are reexamined.

I will focus, however, on heterogeneity of isolated RCs from spinach and, in particular, Chlamydomonas reinhardtii, site-energies of active (electron acceptor) and inactive pheophytins, the nature of the primary electron donor(s), and the possibility of multiple charge-separation (CS) pathways in isolated PSII RCs. I will also discuss various optical spectra obtained for water soluble complex protein (WSCP) focusing on its excitonic structure.

Affiche R. Jankowiak - 72.1 ko