Structure and function of photo-reaction centre chlorophyll [electronic resource]
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| Online Access: |
Online Access |
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| Main Authors: | , , |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Argonne, Ill. : Oak Ridge, Tenn. :
Argonne National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
1978.
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| Subjects: |
| Abstract: | Evidence from electron paramagnetic studies suggests that the unpaired spin in oxidized P700/sup .+/ or P865/sup .+/ is shared by two special chlorophyll a (Chl a) or bacteriochlorophyll a (Bchl a) molecules respectively. Three classes of models have been proposed for special pair reaction center chlorophyll: Asymmetric, in which one Chl a (or Bchl a) acts as electron donor to a second acting as acceptor; models with symmetry only; and models with C/sub 2/ symmetry. Models with C/sub 2/ symmetry have been synthesized in vitro in which two chlorophyll macrocycles are tied together by a covalent link. The singlet and triplet states of the in vitro models have been characterized by epr, nuclear magnetic resonance, and optical studies involving absorption, emission, and lasing behavior. Lasing occurs only from the folded configuration of the linked dimers, suggesting the availability of a highly effective non-radiative decay path from the S/sub 1/ state of the excited open dimer. A radical pair mechanism that accounts for the unusual spin polarization of the special pair triplet is proposed for the primary photochemistry in the reaction center. |
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| Item Description: | Published through SciTech Connect. 02/01/1978. "conf-780237-1" Symposium on chlorophyll organization in photosynthesis and energy transfer, London, UK, Feb 1978. Norris, J.R.; Katz, J.J.; Shipman, L.L. |
| Physical Description: | Pages: 74 : digital, PDF file. |