About: Low-temperature spectroscopy of bacteriochlorophyll c aggregates

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1007/s11120-013-9955-6
Description	Chlorosomes from green photosynthetic bacteria belong to the most effective light-harvesting antennas found in nature. Quinones incorporated in bacterichlorophyll (BChl) c aggregates inside chlorosomes play an important redox-dependent photo-protection role against oxidative damage of bacterial reaction centers. Artificial BChl c aggregates with and without quinones were prepared. We applied hole-burning spectroscopy and steady-state absorption and emission techniques at 1.9 K and two different redox potentials to investigate the role of quinones and redox potential on BChl c aggregates at low temperatures. We show that quinones quench the excitation energy in a similar manner as at room temperature, yet the quenching process is not as efficient as for chlorosomes. Interestingly, our data suggest that excitation quenching partially proceeds from higher excitonic states competing with ultrafast exciton relaxation. Moreover, we obtained structure-related parameters such as reorganization energies and inhomogeneous broadening of the lowest excited state, providing experimental ground for theoretical studies aiming at designing plausible large-scale model for BChl c aggregates including disorder. Chlorosomes from green photosynthetic bacteria belong to the most effective light-harvesting antennas found in nature. Quinones incorporated in bacterichlorophyll (BChl) c aggregates inside chlorosomes play an important redox-dependent photo-protection role against oxidative damage of bacterial reaction centers. Artificial BChl c aggregates with and without quinones were prepared. We applied hole-burning spectroscopy and steady-state absorption and emission techniques at 1.9 K and two different redox potentials to investigate the role of quinones and redox potential on BChl c aggregates at low temperatures. We show that quinones quench the excitation energy in a similar manner as at room temperature, yet the quenching process is not as efficient as for chlorosomes. Interestingly, our data suggest that excitation quenching partially proceeds from higher excitonic states competing with ultrafast exciton relaxation. Moreover, we obtained structure-related parameters such as reorganization energies and inhomogeneous broadening of the lowest excited state, providing experimental ground for theoretical studies aiming at designing plausible large-scale model for BChl c aggregates including disorder. (en)
Title	Low-temperature spectroscopy of bacteriochlorophyll c aggregates Low-temperature spectroscopy of bacteriochlorophyll c aggregates (en)
skos:prefLabel	Low-temperature spectroscopy of bacteriochlorophyll c aggregates Low-temperature spectroscopy of bacteriochlorophyll c aggregates (en)
skos:notation	RIV/00216208:11320/14:10286188!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita	P S
http://linked.open...avai/riv/aktivity	P(GBP501/12/G055), S
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Alster, Jan Paleček, David Dědic, Roman Hála, Jan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	26712
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/14:10286188
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Quinone; Low-temperature spectroscopy; Hole-burning; Excitation quenching; Bacteriochlorophyll aggregates; Artificial light-harvesting (en)
http://linked.open.../riv/klicoveSlovo	Artificial light-harvesting Excitation quenching Hole-burning Low-temperature spectroscopy Quinone Bacteriochlorophyll aggregates
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[7AA2705689B2]
http://linked.open...i/riv/nazevZdroje	Photosynthesis Research
http://linked.open...in/vavai/riv/obor	BO
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Photosynthesis Research Center
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	119
http://linked.open...iv/tvurceVysledku	Dědic, Roman Hála, Jan Paleček, David Alster, Jan
http://linked.open...ain/vavai/riv/wos	000331720100007
issn	0166-8595
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1007/s11120-013-9955-6
http://localhost/t...ganizacniJednotka	11320

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