Počet záznamů: 1
Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria
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SYSNO ASEP 0559500 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria Tvůrce(i) Malina, T. (CZ)
Koehorst, R. (NL)
Bína, David (BC-A) RID, ORCID
Pšenčík, J. (CZ)
van Amerongen, H. (NL)Celkový počet autorů 5 Číslo článku 8354 Zdroj.dok. Scientific Reports. - : Nature Publishing Group - ISSN 2045-2322
Roč. 11, č. 1 (2021)Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova light-harvesting complexes ; low-light condition ; chromosomes Vědní obor RIV BO - Biofyzika Obor OECD Biophysics CEP GA20-01159S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora BC-A - RVO:60077344 UT WOS 000641794400002 EID SCOPUS 85104422037 DOI 10.1038/s41598-021-87664-3 Anotace Chlorosomes are the main light-harvesting complexes of green photosynthetic bacteria that are adapted to a phototrophic life in low-light conditions. They contain a large number of bacteriochlorophyll c, d, or e molecules organized in self-assembling aggregates. Tight packing of the pigments results in strong excitonic interactions between the monomers, which leads to a redshift of the absorption spectra and excitation delocalization. Due to the large amount of disorder present in chlorosomes, the extent of delocalization is limited and further decreases in time after excitation. In this work we address the question whether the excitonic interactions between the bacteriochlorophyll c molecules are strong enough to maintain some extent of delocalization even after exciton relaxation. That would manifest itself by collective spontaneous emission, so-called superradiance. We show that despite a very low fluorescence quantum yield and short excited state lifetime, both caused by the aggregation, chlorosomes indeed exhibit superradiance. The emission occurs from states delocalized over at least two molecules. In other words, the dipole strength of the emissive states is larger than for a bacteriochlorophyll c monomer. This represents an important functional mechanism increasing the probability of excitation energy transfer that is vital in low-light conditions. Similar behaviour was observed also in one type of artificial aggregates, and this may be beneficial for their potential use in artificial photosynthesis. Pracoviště Biologické centrum (od r. 2006) Kontakt Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Rok sběru 2022 Elektronická adresa https://www.nature.com/articles/s41598-021-87664-3
Počet záznamů: 1