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Volumn 106, Issue 7, 2002, Pages 1809-1819

Photophysical properties of PS-2 reaction centers and a discrepancy in exciton relaxation times

Author keywords

[No Author keywords available]

Indexed keywords

CIRCULAR DICHROISM (CD); EXCITON RELAXATION;

EID: 0037149164     PISSN: 10895647     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp013342f     Document Type: Article
Times cited : (53)

References (66)
  • 9
    • 0011783354 scopus 로고
    • Mathis, P., Ed.; Kluwer Academic Publishers: Dordecht, The Netherlands
    • Svensson, B.; Etchebest, C.; Tuffery, P.; van Kann, P.J.; Smith, J.; Styring, S. Biochemistry 1996, 35, 14486. Svensson, B; van Kann, P.J., Styring, S. In Photosynthesis: From Light to Biosphere; Mathis, P., Ed.; Kluwer Academic Publishers: Dordecht, The Netherlands, 1955; p 425.
    • (1955) Photosynthesis: From Light to Biosphere , pp. 425
    • Svensson, B.1    Van Kann, P.J.2    Styring, S.3
  • 18
    • 0011114161 scopus 로고    scopus 로고
    • note
    • From transient hole burning studies at 4 K an electron-transfer time of 1.9 ps was estimated. Latest transient absorption measurements yield a 7 ps and a slower 50 ps transfer time for the primary electron transfer. The simulation of photon echo experiments revealed a distribution of effective charge-transfer times ranging from 1.5 ps to a few nanoseconds.
  • 51
    • 0011085123 scopus 로고    scopus 로고
    • note
    • This approximation assumes that the vibrational relaxation in the excitonic potential energy surfaces is fast and neglects certain coherent contributions (e.g., ref 51) to the pump-probe signal.
  • 54
    • 0011085691 scopus 로고    scopus 로고
    • note
    • D2. Otherwise, a further shift by the excitodic coupling would have resulted.
  • 56
    • 0011089181 scopus 로고    scopus 로고
    • note
    • The Markovian curves in Figures 8 and 9 are identical except for a 0.5 nm shift of the COP curve to shorter wavelengths resulting from the 0.5 nm difference in site energies in the two calculations.
  • 60
    • 0011133689 scopus 로고    scopus 로고
    • note
    • More structural parameters than just the spatial distance between the two pigments may be important. The correlation radius is likely to to be a function of the frequency of the normal modes, since high-frequency modes can be expected to be more localized.
  • 61
    • 0011085826 scopus 로고    scopus 로고
    • note
    • (a) The electron density of the porphyrins in ref 2 did allow the resolution of the planes of the porphyrins. However, only little structure could be resolved inside the plain, the asymmetry for the electron density of the two pheophytins being somewhat greater than for the rest of the pigments. Therefore, there is no direct structural information available yet on the geometry of optical transition dipoles (P. Fromme, private communication).
  • 62
    • 0011145553 scopus 로고    scopus 로고
    • note
    • (b) A 180° rotation of any transition dipole would not change the optical spectra calculated here, but would lead to some sign changes in Table 1.
  • 66
    • 0011136913 scopus 로고    scopus 로고
    • note
    • The PS-2 reaction center cannot use carotenoids for photoprotection (quenching of chlorophyll triplet states) because its high redox potential would lead to an oxidation of the carotenoids. Because of the shallow trap, however, some of the excitations will escape the reaction center and the subsequently occurring triplet states can be quenched by the carotenoids in the antennae (J. Barber, private communication).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.