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• W2000441097 abstract "Green sulfur bacteria possess a complex photosynthetic machinery. The dominant light harvesting systems are chlorosomes, which consist of bacteriochlorophyll c, d or e oligomers with small amounts of protein. The chlorosomes are energetically coupled to the membrane-embedded iron sulfur-type reaction center via a bacteriochlorophyll a-containing baseplate protein and the Fenna-Matthews-Olson (FMO) antenna protein. The fluorescence yield and spectral properties of these photosynthetic complexes were investigated in intact cells of several species of green sulfur bacteria under physiological, anaerobic conditions. Surprisingly, green sulfur bacteria show a complex modulation of fluorescence yield upon illumination that is very similar to that observed in oxygenic phototrophs. Within a few seconds of illumination, the fluorescence reaches a maximum, which decreases within a minute of illumination to a lower steady state. Fluorescence spectroscopy reveals that the fluorescence yield during both processes is primarily modulated on the FMO-protein level, while the emission from chlorosomes remains mostly unchanged. The two most likely candidates that modulate bacteriochlorophyll fluorescence are (1) direct excitation quenching at the FMO-protein level and (2) indirect modulation of FMO-protein fluorescence by the reduction state of electron carriers that are part of the reaction center." @default.
• W2000441097 created "2016-06-24" @default.
• W2000441097 creator A5023047887 @default.
• W2000441097 creator A5084019740 @default.
• W2000441097 date "2007-01-01" @default.
• W2000441097 modified "2023-09-26" @default.
• W2000441097 title "Variable fluorescence in green sulfur bacteria" @default.
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• W2000441097 doi "https://doi.org/10.1016/j.bbabio.2006.11.011" @default.
• W2000441097 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17189610" @default.
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