Low-Energy Exciton Level Structure and Dynamics in LightHarvesting Complex II Trimers from the Chl a/b Antenna Complex of Photosystem II

1994 ◽  
Vol 98 (17) ◽  
pp. 4729-4735 ◽  
Author(s):  
N. R. S. Reddy ◽  
H. van Amerongen ◽  
S. L. S. Kwa ◽  
R. van Grondelle ◽  
G. J. Small
Keyword(s):  
Photosystem Ii ◽  
Level Structure ◽  
Low Energy ◽  
Complex Ii ◽  
Chl A ◽  
Structure And Dynamics ◽  
Antenna Complex

scholarly journals Exciton Level Structure and Dynamics in the CP47 Antenna Complex of Photosystem II

1994 ◽  
Vol 98 (31) ◽  
pp. 7717-7724 ◽  
Author(s):  
H.-C. Chang ◽  
R. Jankowiak ◽  
C. F. Yocum ◽  
R. Picorel ◽  
M. Alfonso ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Level Structure ◽  
Structure And Dynamics ◽  
Antenna Complex

scholarly journals On the Conflicting Estimations of Pigment Site Energies in Photosynthetic Complexes: A Case Study of the CP47 Complex

2016 ◽  
Vol 11 ◽  
pp. ACI.S32151 ◽  
Author(s):  
Tonu Reinot ◽  
Jinhai Chen ◽  
Adam Kell ◽  
Mahboobe Jassas ◽  
Kevin C. Robben ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Population Dynamics ◽  
Photosystem Ii ◽  
Hole Burning ◽  
Protein Subunit ◽  
Structure Population ◽  
Chl A ◽  
Antenna Complex ◽  
Photosynthetic Complexes

We focus on problems with elucidation of site energies ( E n0) for photosynthetic complexes (PSCs) in order to raise some genuine concern regarding the conflicting estimations propagating in the literature. As an example, we provide a stern assessment of the site energies extracted from fits to optical spectra of the widely studied CP47 antenna complex of photosystem II from spinach, though many general comments apply to other PSCs as well. Correct values of E n0 for chlorophyll (Chl) a in CP47 are essential for understanding its excitonic structure, population dynamics, and excitation energy pathway(s). To demonstrate this, we present a case study where simultaneous fits of multiple spectra (absorption, emission, circular dichroism, and nonresonant hole-burned spectra) show that several sets of parameters can fit the spectra very well. Importantly, we show that variable emission maxima (690-695 nm) and sample-dependent bleaching in nonresonant hole-burning spectra reported in literature could be explained, assuming that many previously studied CP47 samples were a mixture of intact and destabilized proteins. It appears that the destabilized subpopulation of CP47 complexes could feature a weakened hydrogen bond between the 13 1 -keto group of Chl29 and the PsbH protein subunit, though other possibilities cannot be entirely excluded, as discussed in this work. Possible implications of our findings are briefly discussed.

scholarly journals Energy Transfer Pathways in the Minor Antenna Complex CP29 of Photosystem II: A Femtosecond Study of Carotenoid to Chlorophyll Transfer on Mutant and WT Complexes

2003 ◽  
Vol 84 (4) ◽  
pp. 2517-2532 ◽  
Author(s):  
Roberta Croce ◽  
Marc G. Müller ◽  
Stefano Caffarri ◽  
Roberto Bassi ◽  
Alfred R. Holzwarth
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Antenna Complex

scholarly journals Biomass accumulation, photochemical efficiency of photosystem II, nutrient contents and nitrate reductase activity in young rosewood plants (Aniba rosaeodora Ducke) submitted to different NO3-:NH4+ ratios

2007 ◽  
Vol 37 (4) ◽  
pp. 533-541 ◽  
Author(s):  
Denize Caranhas de Sousa Barreto ◽  
José Francisco de Carvalho Gonçalves ◽  
Ulysses Moreira dos Santos Júnior ◽  
Andreia Varmes Fernandes ◽  
Adriana Bariani ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Nitrate Reductase ◽  
Growth Performance ◽  
Nitrate Reductase Activity ◽  
Reductase Activity ◽  
Photochemical Efficiency ◽  
Biomass Accumulation ◽  
Nitrate Content ◽  
Chl A ◽  
Culture Substrate

The rosewood (Aniba rosaeodora Ducke) is a native tree species of Amazon rainforest growing naturally in acidic forest soils with reduced redox potential. However, this species can also been found growing in forest gaps containing oxide soils. Variations in the forms of mineral nitrogen (NO3- or NH4+) may be predicted in these different edaphic conditions. Considering that possibility, an experiment was carried out to analyze the effects of different NO3-:NH4+ ratios on the growth performance, mineral composition, chloroplastid pigment contents, photochemical efficiency photosystem II (PSII), and nitrate redutase activity (RN, E.C.1.6.6.1) on A. rosaeodora seedlings. Nine-month-old seedlings were grown in pots with a washed sand capacity of 7.5 kg and submitted to different NO3-:NH4+ ratios (T1 = 0:100%, T2 = 25:75%, T3 = 50:50%, T4 = 75:25%, and T5 = 100:0%). The lowest relative growth rate was observed when the NO3-:NH4+ ratio was equal to 0:100%. In general, high concentrations of NO3- rather than NH4+ favored a greater nutrient accumulation in different parts of the plant. For the chloroplastid pigment, the highest Chl a, Chl b, Chl tot, Chl a/b and Chl tot/Cx+c contents were found in the treatment with 75:25% of NO3-:NH4+, and for Chl b and Cx+c it was observed no difference. In addition, there was a higher photochemical efficiency of PSII (Fv/Fm) when high NO3- concentrations were used. A linear and positive response for the nitrate reductase activity was recorded when the nitrate content increased on the culture substrate. Our results suggest that A. rosaeodora seedlings have a better growth performance when the NO3- concentrations in the culture substrate were higher than the NH4+ concentrations.

Charge-Transfer Character of the Low-Energy Chl a Qy Absorption Band in Aggregated Light Harvesting Complexes II

2014 ◽  
Vol 118 (23) ◽  
pp. 6086-6091 ◽  
Author(s):  
Adam Kell ◽  
Ximao Feng ◽  
Chen Lin ◽  
Yiqun Yang ◽  
Jun Li ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Absorption Band ◽  
Light Harvesting ◽  
Low Energy ◽  
Light Harvesting Complexes ◽  
Chl A
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