β-Carotene Probes the Energy Transfer Pathway in the Photosystem II Core Complex

2019 ◽  
Vol 10 (13) ◽  
pp. 3710-3714 ◽  
Author(s):  
Yusuke Yoneda ◽  
Yutaka Nagasawa ◽  
Yasufumi Umena ◽  
Hiroshi Miyasaka
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Core Complex ◽  
Energy Transfer Pathway ◽  
Β Carotene

The Position of Carotene in the D-1/D-2 Sub-Core Complex of Photosystem II

1988 ◽  
Vol 43 (3-4) ◽  
pp. 226-230 ◽  
Author(s):  
S. S. Brody
Keyword(s):  
Low Temperature ◽  
Photosystem Ii ◽  
Fluorescence Spectrum ◽  
Fluorescence Excitation Spectrum ◽  
Core Complex ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Pheophytin A ◽  
Long Wavelength ◽  
Β Carotene

When the sub-core complex of photosystem II, D1/D2, is irradiated at 436 or 415 nm (absorption by chlorophyll and pheophytin and β-carotene) or 540 nm (absorption primarily by pheophytin), the low temperature fluorescence spectrum has two maxima, at 685 and 674 nm. This shows the existence of at least two different fluorescent forms of chlorophyll (chlorophyll a and perhaps pheophytin a). When carotene is irradiated at 485 nm (absorption primarily by β-carotene), only fluorescence at 685 nm is observed: this indicates that carotene is transferring energy to only the long-wavelength form of chlorophyll in the D1/D2 sub-core complex. The band of carotene (at 485 nm) does not appear in the fluorescence excitation spectrum, measured at 674 nm. The position of the carotene molecule relative to each of the fluorescent forms of chlorophyll was determined from the excitation spectra of each of the fluorescence bands.

Dynamics of β-Carotene-to-Chlorophyll Singlet Energy Transfer in the Core of Photosystem II

2003 ◽  
Vol 107 (25) ◽  
pp. 6214-6220 ◽  
Author(s):  
Frank L. de Weerd ◽  
Jan P. Dekker ◽  
Rienk van Grondelle
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
The Core ◽  
Β Carotene

Ultrafast energy transfer within the photosystem II core complex

2017 ◽  
Vol 19 (23) ◽  
pp. 15356-15367 ◽  
Author(s):  
Jie Pan ◽  
Andrius Gelzinis ◽  
Vladimir Chorošajev ◽  
Mikas Vengris ◽  
S. Seckin Senlik ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Electronic Spectroscopy ◽  
Two Dimensional ◽  
Core Complex ◽  
Polaron Formation

Two-dimensional electronic spectroscopy of the photosystem II core complex reveals rapid energy transfer that can be explained through excitonic-polaron formation.

A theoretical study on the dynamics of light harvesting in the dimeric photosystem II core complex: regulation and robustness of energy transfer pathways

2019 ◽  
Vol 216 ◽  
pp. 94-115 ◽  
Author(s):  
Shou-Ting Hsieh ◽  
Lu Zhang ◽  
De-Wei Ye ◽  
Xuhui Huang ◽  
Yuan-Chung Cheng
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Theoretical Study ◽  
Light Harvesting ◽  
Coarse Grained ◽  
Core Complex ◽  
Coarse Grained Model ◽  
Complex Regulation ◽  
Psii Core Complex

Coarse-grained model for dimeric PSII core complex reveals robust light harvesting through inter-monomer energy transfer and pooling in CP47s.

scholarly journals Charge Separation and Energy Transfer in the Photosystem II Core Complex Studied by Femtosecond Midinfrared Spectroscopy

2007 ◽  
Vol 93 (8) ◽  
pp. 2732-2742 ◽  
Author(s):  
N.P. Pawlowicz ◽  
M.-L. Groot ◽  
I.H.M. van Stokkum ◽  
J. Breton ◽  
R. van Grondelle
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Charge Separation ◽  
Core Complex

Carbon-Heteroatom Cross-Coupling via an Electronically Excited Nickel (II) Complex

2019 ◽  
Author(s):  
Randolph Escobar ◽  
Jeffrey Johannes
Keyword(s):  
Energy Transfer ◽  
Functional Groups ◽  
Cross Coupling ◽  
Reductive Elimination ◽  
Aryl Halides ◽  
Coupling Reactions ◽  
General Methodology ◽  
Cross Coupling Reactions ◽  
Electronically Excited ◽  
Energy Transfer Pathway

<div>While carbon-heteroatom cross coupling reactions have been extensively studied, many methods are specific and</div><div>limited to a set of substrates or functional groups. Reported here is a method that allows for C-O, C-N and C-S cross coupling reactions under one general methodology. We propose that an energy transfer pathway, in which an iridium photosensitizer produces an excited nickel (II) complex, is responsible for the key reductive elimination step that couples aryl halides to 1° and 2° alcohols, anilines, thiophenols, carbamates and sulfonamides.</div>

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