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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2001
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2003
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Exciton relaxation and transfer in the LH2 antenna network of photosynthetic bacteria. Unraveling exciton relaxation and energy transfer in LH2 photosynthetic antennas
- Abstracts: Kinetics of adsorption of the cobalt ions on the 'electrolytic solution/gamma-alumina' interface. Theoretical study of the dehydration process of boehmite to gamma-alumina
- Abstracts: Kinetics of SO(sub 2) adsorption on photoexcited alpha-Fe(sub 2)O(sub 3)
- Abstracts: The role of ions in the plasma polymerization of allylamine
- Abstracts: Radical pair dynamics and interactions in quinone-reconstituted photosynthetic reaction centers of Rb. sphaeroides R26: a multifrequency magnetic resonance study