Exciton relaxation and transfer in the LH2 antenna network of photosynthetic bacteria
Article Abstract:
Research was conducted to examine exciton relaxation and transfer in the LH2 antenna network of photosynthetic bacterium Rhodobacter sphaeroides at 8 K. The excitation of excitons were performed in the B850 aggregagate of bacteriochlorophyll a molecules using 5 nm spectral bandwidth. Results suggest that an spectrally disordered exciton model, which takes into consideration a dimeric association of the bacteriochlorophyll molecules in the B850 ring, can satisfactorily explain the experimental observations.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Unraveling exciton relaxation and energy transfer in LH2 photosynthetic antennas
Article Abstract:
Isolated and native membrane-embedded LH2 antenna complexes are studied using femtosecond time-resolved transient absorption spectroscopy together with conventional absorption and fluorescence emission spectroscopies at low temperatures. Exciton relaxation within isolated LH2 complexes is characterized by subpicosecond time constants, while spectral evolution associated is characterized by time constants more than or equal to 1 ps.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
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Short-range excition couplings in LH2 photosynthetic antenna proteins studied by high hydrostatic pressure absorption spectroscopy
Article Abstract:
The effects of high hydrostatic pressure (up to 8 kbar) on bacteriochlorophyll a Q(sub y) electronic absorption bands of LH2 photosynthetic antenna complexes are studied at ambient temperature. A variety of samples are studied, including intact membranes and isolated complexes from wild type and mutant photosynthetic bacteria Rhodobacter sphaeroides, Rhodopseudomonas acidophila, and Rhodospirillum molischianum.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2001
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