Počet záznamů: 1
Carotenoids in Energy Transfer and Quenching Processes in Pcb and Pcb-PS I Complexes from Prochlorothrix hollandica
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SYSNO ASEP 0345900 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Carotenoids in Energy Transfer and Quenching Processes in Pcb and Pcb-PS I Complexes from Prochlorothrix hollandica Tvůrce(i) Durchan, Milan (BC-A) RID
Herbstová, Miroslava (BC-A) RID
Fuciman, M. (CZ)
Gardian, Zdenko (BC-A) RID
Vácha, František (BC-A) RID
Polívka, Tomáš (BC-A) RID, ORCIDCelkový počet autorů 6 Zdroj.dok. Journal of Physical Chemistry B. - : American Chemical Society - ISSN 1520-6106
Roč. 114, č. 28 (2010), s. 9275-9282Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova carotenoids ; oxyphotobacteria ; energy transfer Vědní obor RIV BO - Biofyzika CEP IAA608170604 GA AV ČR - Akademie věd IAA608170603 GA AV ČR - Akademie věd CEZ AV0Z50510513 - UMBR-M, BC-A (2005-2011) UT WOS 000279787400022 DOI 10.1021/jp1026724 Anotace Chlorophyll (Chl) a/b-binding proteins from Prochlorothrix hollandica known as Pcb antennae were studied by femtosecond transient absorption to identify energy transfer rates and pathways. Carotenoids transfer energy to Chl with low efficiency of ~25% in Pcb complexes. Analysis of transient absorption spectra identified a pathway from the hot S1 state of carotenoids as the major energy transfer channel between whereas the S2 state contributes only marginally to energy transfer. Due to energetic reasons, no energy transfer is possible via the relaxed S1 state of carotenoids. The low overall energy transfer efficiency of carotenoids recognizes chlorophylls as the main light-harvesting pigments. Besides Chl a, presence of Chl b, which transfers energy to Chl a with nearly 100% efficiency, significantly broadens the spectral range accessible for light-harvesting and improves cross-section of Pcb complexes. The major role of carotenoids in Pcb is photoprotection. Pracoviště Biologické centrum (od r. 2006) Kontakt Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Rok sběru 2012
Počet záznamů: 1