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• W1968657849 startingPage "5573" @default.
• W1968657849 abstract "A recently isolated species of the photosynthetic purple sulfur bacteria, provisionally called strain 970, was investigated with respect to its antenna function by means of various spectroscopic techniques, including fluorescence and pump-probe absorption difference spectroscopy. The bacterium contains bacteriochlorophyll a and an as yet unidentified carotenoid, perhaps 3,4,3',4'-tetrahydrospirilloxanthin. It has a single antenna complex of the LH1 type, with a Q(y) absorption band situated at the unusually long wavelength of 963 nm at room temperature and 990 nm at 6 K. In contrast to many other species, the reaction center showed two well-separated absorption bands of bacteriopheophytin at 6 K, located at 747 and 762 nm. The primary electron donor showed a bleaching band centered at 925 nm upon photooxidation. Thus, the energy gap between LH1 and the primary electron donor is quite large in this strain: 425 cm(-1). Nevertheless, trapping occurred with a time constant of 65 +/- 5 ps, similar to the rates observed in other purple bacteria. As in other species, no back-transfer from the reaction center to the antenna was observed. Our results show that strain 970 is a unique subject for the study of antenna and reaction center function and organization." @default.
• W1968657849 created "2016-06-24" @default.
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• W1968657849 date "2001-04-14" @default.
• W1968657849 modified "2023-10-05" @default.
• W1968657849 title "A Bacteriochlorophyll <i>a</i> Antenna Complex from Purple Bacteria Absorbing at 963 nm^," @default.
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• W1968657849 doi "https://doi.org/10.1021/bi0024308" @default.
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