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- W2040572801 abstract "A study was made of the optical properties of isolated reaction centers of the gliding green bacterium Chloroflexus aurantiacus. The absorption spectrum measured at 4 K indicates that these reaction centers contain bacteriochlorophyll a and bacteriopheophytin a, but no other pigments. The fluorescence excitation spectrum at 4 K showed efficient energy transfer from all pigment molecules to P-865, the primary electron donor. Absorption, linear and circular dichroism spectra of reduced and oxidized samples were measured at 77 K in order to obtain information about the dipole strengths, orientations and interactions of the transition dipoles. The results agree with a model for the reaction center that involves three bacteriopheophytin and four closely interacting bacteriochlorophyll molecules. The three bacteriopheophytins do not seem to be closely coupled to the primary donor. The primary electron donor consists of a bacteriochlorophyll dimer absorbing at 887 nm at 77 K, while the other two bacteriochlorophylls are responsible for the absorption around 800 nm and are also strongly coupled as indicated by their exciton splitting." @default.
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- W2040572801 date "1983-09-01" @default.
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- W2040572801 title "Optical properties of the photosynthetic reaction center of Chloroflexus aurantiacus at low temperature" @default.
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- W2040572801 doi "https://doi.org/10.1016/0005-2728(83)90092-0" @default.
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