Quantum Mechanical Calculations of Xanthophyll–Chlorophyll Electronic Coupling in the Light-Harvesting Antenna of Photosystem II of Higher Plants

2013 ◽  
Vol 117 (25) ◽  
pp. 7605-7614 ◽  
Author(s):  
C. D. P. Duffy ◽  
L. Valkunas ◽  
A. V. Ruban
Keyword(s):  
Photosystem Ii ◽  
Light Harvesting ◽  
Higher Plants ◽  
Quantum Mechanical ◽  
Electronic Coupling ◽  
Quantum Mechanical Calculations ◽  
Light Harvesting Antenna

Molecular porphyrin­fullerene architectures

2003 ◽  
Vol 75 (8) ◽  
pp. 1069-1075 ◽  
Author(s):  
D. M. Guldi
Keyword(s):  
Reaction Center ◽  
Electron Donor ◽  
Electron Acceptor ◽  
Light Harvesting ◽  
Reorganization Energy ◽  
Electronic Coupling ◽  
Artificial Light ◽  
Coupling Element ◽  
Light Harvesting Antenna ◽  
Energetic Charge

This article describes the utilization of porphyrin and fullerene architectures—yielding artificial light-harvesting antenna and reaction center mimics—to tune the electronic coupling element between electron donor and electron acceptor and ultimately to affect the total reorganization energy. Most importantly, the effects that these parameters have on the rate, yield, and lifetime of the energetic charge-separated states are discussed.

scholarly journals Exciton equilibration in the light-harvesting complex of Photosystem II of higher plants

1995 ◽  
Vol 1231 (2) ◽  
pp. 147-156 ◽  
Author(s):  
Gerhard Kehrberg ◽  
Joachim Voigt ◽  
Thorsten Schrötter ◽  
Gernot Renger
Keyword(s):  
Photosystem Ii ◽  
Light Harvesting ◽  
Higher Plants ◽  
Light Harvesting Complex

Acclimation of the Photosynthetic Apparatus to Photosystem I or Photosystem II Light: Evidence from Quantum Yield Measurements and Fluorescence Spectroscopy of Cyanobacterial Cells

1989 ◽  
Vol 44 (1-2) ◽  
pp. 109-118 ◽  
Author(s):  
Anastasios Melis ◽  
Conrad W. Mullineaux ◽  
John F. Allen
Keyword(s):  
Quantum Yield ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Oxygen Evolution ◽  
Photosystem I ◽  
Light Harvesting ◽  
Ps Ii ◽  
Ps I ◽  
Synechococcus 6301 ◽  
Light Harvesting Antenna

Abstract Cells of the cyanobacterium Synechococcus 6301 were grown under illumination whose spectral composition favoured absorption either by the phycobilisome (PBS) light-harvesting antenna of photosystem II (PS II) or by the chlorophyll (Chi) a light-harvesting antenna of photosystem I (PS I). Cells grown under PS I-light developed relatively high PS II/PS I and PBS/Chl ratios. Cells grown under PS II-light developed relatively low PS II/PS I and PBS/Chl ratios. Thus, the primary difference between cells in the two acclimation states appeared to be the relative concentration of PBS-PS II and PS I complexes in the thylakoid membrane. Measurements of the quantum yield of oxygen evolution suggested a higher efficiency of cellular photosynthesis upon the adjustment of photosystem stoichiometry to a specific light condition. The quantum yield of oxygen evolution was nevertheless lower under PBS than Chi excitation, suggesting quenching of excitation energy in the photochemical apparatus of PS II in Synechococcus 6301. This phenomenon was more pronounced in the PS II-light than in the PS I-light grown cells. Room temperature and 77 K fluorescence emission spectroscopy indicated that excess excitation energy in the PBS was not transferred to PS I, suggesting the operation of a non-radiative and non-photochemical decay of excitation energy at the PBS-PS II complex. This non-photochemical quenching was specific to conditions where excitation of PS II occurred in excess of its capacity for useful photochemistry.

scholarly journals Supermolecular organization of photosystem II and its associated light-harvesting antenna in Arabidopsis thaliana

2001 ◽  
Vol 268 (23) ◽  
pp. 6020-6028 ◽  
Author(s):  
Alevtyna E. Yakushevska ◽  
Poul E. Jensen ◽  
Wilko Keegstra ◽  
Henny van Roon ◽  
Henrik V. Scheller ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Photosystem Ii ◽  
Light Harvesting ◽  
Light Harvesting Antenna
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