Excitation dynamics in the LH2 complex from photosynthetic purple bacterium Thiorhodospira sibirica under femtosecond excitation and probingстатья

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Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.

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[1] Excitation dynamics in the lh2 complex from photosynthetic purple bacterium thiorhodospira sibirica under femtosecond excitation and probing / A. P. Razjivin, V. O. Kompanets, R. Y. Pishchalnikov et al. // Biologicheskie Membrany. — 2005. — Vol. 22, no. 2. — P. 83–91. Photoinduced absorption changes of the LH2 complex (B800-830-850) from Trs. sibirica under ultra-short light pulse excitation (similar to 50 fs, 800 nm) at room temperature were investigated. This complex has an anomalous absorption spectrum with three peaks (near 800 nm, 830 nm and 850 nm) within near infrared region. The excitation energy transfer from the B800 band with time constant tau(1) similar to 0.5 ps was shown; from the B830 band with tau(2) similar to 2.5 ps; from the B850 band - with tau(3) about hundreds picoseconds. Fast (in comparison with the excitation deactivation rate in the B850 band) energy transfer from the B830 band ((tau(2) << tau(3)) is an evidence for homogeneity of the LH2 complex from Trs. sibirica (i.e. all three bands belong to the same complex). Slow energy transfer from the B830 band (in comparison with energy transfer from the B800 band in B800-850 complexes and, especially, in B800-820 complexes) points to difference between excitonic structure of this complex and LH2 complexes from other purple bacteria.

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