Kinetics of excitation migration and trapping in the photosynthetic unit of purple bacteria

Article Abstract:

The photosynthetic unit (PSU) of purple bacteria is a nanometric molecular machinery in which several hundred bacteriochlorophylls (BChl's) and carotenoids (Car's) absorb light and convert the light energy into vectorial energy transfer and subsequently an electrostatic potential. The case of model architectures of the PSU indicates how sensitively excitation trapping depends on the architectures of the PSU and through which architectures a fast excitation trapping with a near unit quantum yield can be accomplished.

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Electronic excitations in aggregates of bacteriochlorophylls

Article Abstract:

The structure of one aggregate of bacteriochlorophyll (Bchl) in the antenna system of a photosynthetic organism was investigated. Electronic excitations of the aggregates were found to be relevant for the biological function of Bchls to absorb light and transfer energy on the subpicosecond time scale. The lower-energy excitations of the BChl dexadecamer are due to strong coupling and excitation delocalization. These exciton states can be generalized to other aggregates.

Cell aggregation, Bacteria, Photosynthetic, Photosynthetic bacteria, Exciton theory, Excitons, Excited state chemistry

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Excitation energy transfer from carotenoid to bacteriohlorophyll in the photosynthetic purple bacterial reaction center of Rhodobacter sphaeroides

Article Abstract:

The role of carotenoid in singlet excitation energy transfer in the purple bacterial reaction center of Rhodobacter sphaeroides is studied using femosecond transient absorbance spectroscopy techniques at room temperature. It is found that the intact photosynthetic system contains a large number of antenna complexes that include carotenoid molecules whose absorption intensity is much higher at all wavelengths than that contributed by the reaction center itself.

Carotenoids, Properties

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