کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10870420 | 1074000 | 2014 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Red chlorophyll excitation dynamics in Arthrospira platensis photosystem I trimeric complexes as studied by femtosecond transient absorption spectroscopy
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Femtosecond absorption spectroscopy was applied to study for the first time excitation dynamics in isolated photosystem I trimers from Arthrospira platensis, which display extremely long-wavelength absorption peaks. Pump-probe spectra observed at 77Â K in the timescale of dozens of picoseconds upon 70-fs excitation revealed two maxima near 710 and 730Â nm, which correspond to red chlorophyll forms. Bleaching at 680Â nm developed in â¼200Â fs, whereas the bleaching kinetics at 710 and 730Â nm exhibited two components with time constants of 1 and 5.5Â ps. Comparison of the kinetics of bleaching development at 710Â nm and 730Â nm with that of bleaching decay at 680Â nm indicated that both long-wavelength forms of trimers are populated mainly via direct energy transfer from bulk chlorophyll.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: FEBS Letters - Volume 588, Issue 18, 17 September 2014, Pages 3441-3444
Journal: FEBS Letters - Volume 588, Issue 18, 17 September 2014, Pages 3441-3444
نویسندگان
Viktor Kompanets, Vladimir Shubin, Irina Terekhova, Elena Kotova, Vladimir Kozlovsky, Vladimir Novoderezhkin, Sergey Chekalin, Navasard Karapetyan, Andrei Razjivin,