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| Description
| - Chromophytes are an important group of microorganisms that contribute significantly to the carbon cycle on Earth. Their photosynthetic capacity depends on efficiency of the light-harvesting system that differs in pigment composition from that of green plants and other groups of algae. Here we employ femtosecond transient absorption spectroscopy to study energy transfer pathways in the main light-harvesting complex of Xanthonema debile, denoted XLH, which contains four carotenoids-diadinoxanthin, heteroxanthin, diatoxanthin, and vaucheriaxanthin-and Chl-a. Overall carotenoid-to-chlorophyll energy transfer efficiency is about 60%, but energy transfer pathways are excitation wavelength dependent. Energy transfer from the carotenoid S-2 state is active after excitation at both 490 nm (maximum of carotenoid absorption) and 510 nm (red edge of carotenoid absorption), but this channel is significantly more efficient after 510 nm excitation. Concerning the energy transfer pathway from the S, state, XLH contains two groups of carotenoids: those that have the S, route active (similar to 25%) and those having the S, pathway silent. For a fraction of carotenoids that transfer energy via the S, channel, energy transfer is observed after both excitation wavelengths, though energy transfer times are different, yielding 3.4 ps (490 nm excitation) and 1.5 ps (510 nm excitation).
- Chromophytes are an important group of microorganisms that contribute significantly to the carbon cycle on Earth. Their photosynthetic capacity depends on efficiency of the light-harvesting system that differs in pigment composition from that of green plants and other groups of algae. Here we employ femtosecond transient absorption spectroscopy to study energy transfer pathways in the main light-harvesting complex of Xanthonema debile, denoted XLH, which contains four carotenoids-diadinoxanthin, heteroxanthin, diatoxanthin, and vaucheriaxanthin-and Chl-a. Overall carotenoid-to-chlorophyll energy transfer efficiency is about 60%, but energy transfer pathways are excitation wavelength dependent. Energy transfer from the carotenoid S-2 state is active after excitation at both 490 nm (maximum of carotenoid absorption) and 510 nm (red edge of carotenoid absorption), but this channel is significantly more efficient after 510 nm excitation. Concerning the energy transfer pathway from the S, state, XLH contains two groups of carotenoids: those that have the S, route active (similar to 25%) and those having the S, pathway silent. For a fraction of carotenoids that transfer energy via the S, channel, energy transfer is observed after both excitation wavelengths, though energy transfer times are different, yielding 3.4 ps (490 nm excitation) and 1.5 ps (510 nm excitation). (en)
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| Title
| - Role of Carotenoids in Light-Harvesting Processes in an Antenna Protein from the Chromophyte Xanthonema debile
- Role of Carotenoids in Light-Harvesting Processes in an Antenna Protein from the Chromophyte Xanthonema debile (en)
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| skos:prefLabel
| - Role of Carotenoids in Light-Harvesting Processes in an Antenna Protein from the Chromophyte Xanthonema debile
- Role of Carotenoids in Light-Harvesting Processes in an Antenna Protein from the Chromophyte Xanthonema debile (en)
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| skos:notation
| - RIV/60076658:12310/12:43883428!RIV13-MSM-12310___
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| http://linked.open...avai/predkladatel
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
| - I, P(GAP205/11/1164), S, Z(AV0Z50510513), Z(MSM6007665808)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/60076658:12310/12:43883428
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - LH2 COMPLEXES; PURPLE BACTERIA; CYCLOTELLA-MENEGHINIANA; S-1 STATE; BETA-CAROTENE; AMPHIDINIUM-CARTERAE; EXCITED SINGLET-STATES; RESOLVED ABSORPTION-SPECTROSCOPY; CHLOROPHYLL-A-PROTEIN; EXCITATION-ENERGY TRANSFER (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - JOURNAL OF PHYSICAL CHEMISTRY B
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
| |
| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Polívka, Tomáš
- Vácha, František
- Durchan, Milan
- Hříbek, Petr
- Gardian, Zdenko
- Šlouf, Václav
- Litvín, Radek
- Tichý, Josef
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| http://linked.open...ain/vavai/riv/wos
| |
| http://linked.open...n/vavai/riv/zamer
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| issn
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| number of pages
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| http://bibframe.org/vocab/doi
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| http://localhost/t...ganizacniJednotka
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| is http://linked.open...avai/riv/vysledek
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