scholarly journals Direct Energy Transfer from Allophycocyanin-Free Rod-Type CpcL-Phycobilisome to Photosystem I

2021 ◽  
Author(s):  
Tomoyasu Noji ◽  
Mai Watanabe ◽  
Takehisa Dewa ◽  
Shigeru Itoh ◽  
masahiko ikeuchi
Keyword(s):  
Energy Transfer ◽  
Photosystem I ◽  
High Efficiency ◽  
Picosecond Laser ◽  
Fast Time ◽  
Energy Transfer Mechanism ◽  
Förster Energy Transfer ◽  
Direct Energy ◽  
Pcc 7120 ◽  
Photosynthetic Antenna

Phycobilisomes (PBSs) are photosynthetic antenna megacomplexes comprised of pigment-binding proteins (cores and rods) joined with linker proteins. A rod-type PBS that does not have a core is connected to photosystem I (PSI) by a pigment-free CpcL linker protein, which induces a red-shift of the absorption band of phycocyanobilin (PCB) in the rod (red-PCB). Herein, the isolated supercomplex of the rod-type PBS and the PSI tetramer from Anabaena sp. PCC 7120 were probed by picosecond laser spectroscopy at 77 K and by decay-associated spectral analysis to show that red-PCB mediates the fast (time constant = 90 ps) and efficient (efficiency = 95%) transfer of excitation energy from PCB in rod to chlorophyll a (Chl a) in PSI. According to the Förster energy transfer mechanism, this high efficiency corresponds to a 4-nm distance between red-PCB and Chl a, suggesting that β-84 PCB in rod acts as red-PCB.

scholarly journals Author Correction: Direct energy transfer from photosystem II to photosystem I confers winter sustainability in Scots Pine

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Pushan Bag ◽  
Volha Chukhutsina ◽  
Zishan Zhang ◽  
Suman Paul ◽  
Alexander G. Ivanov ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Scots Pine ◽  
Photosystem I ◽  
Direct Energy ◽  
Direct Energy Transfer

A Correction to this paper has been published: https://doi.org/10.1038/s41467-021-22013-6

scholarly journals Direct Energy Transfer from Allophycocyanin-Free Rod-Type CpcL-Phycobilisome to Photosystem I

2021 ◽  
pp. 6692-6697
Author(s):  
Tomoyasu Noji ◽  
Mai Watanabe ◽  
Takehisa Dewa ◽  
Shigeru Itoh ◽  
Masahiko Ikeuchi
Keyword(s):  
Energy Transfer ◽  
Photosystem I ◽  
Direct Energy ◽  
Direct Energy Transfer

Förster energy transfer mechanism and color tunability in three binary conjugated polymer blends

2021 ◽  
Vol 116 ◽  
pp. 111085
Author(s):  
Sameer Al-Bati ◽  
Mohammad Hafizuddin Hj Jumali ◽  
Khatatbeh Ibtehaj ◽  
Bandar Ali Al-Asbahi ◽  
Chi Chin Yap
Keyword(s):  
Energy Transfer ◽  
Polymer Blends ◽  
Conjugated Polymer ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Förster Energy Transfer ◽  
Color Tunability

scholarly journals Ферстеровский резонансный перенос энергии с участием светлых и темных экситонов в массивах эпитаксиальных квантовых точек CdSe/ZnSe

2018 ◽  
Vol 60 (8) ◽  
pp. 1575
Author(s):  
Т.Н. Михайлов ◽  
Е.А. Европейцев ◽  
К.Г. Беляев ◽  
A.A. Торопов ◽  
A.В. Родина ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excited States ◽  
Energy Transfer Process ◽  
Dipole Interaction ◽  
Energy Transfer Mechanism ◽  
Time Resolved ◽  
Decay Times ◽  
Förster Energy Transfer ◽  
Excitonic States ◽  
Time Resolved Photoluminescence

AbstractUsing time-resolved photoluminescence (PL) spectroscopy, we establish the presence of the Förster energy transfer mechanism between two arrays of epitaxial CdSe/ZnSe quantum dots (QDs) of different sizes. The mechanism operates through dipole–dipole interaction between ground excitonic states of the smaller QDs and excited states of the larger QDs. The dependence of energy transfer efficiency on the width of barrier separating the QD insets is shown to be in line with the Förster mechanism. The temperature dependence of the PL decay times and PL intensity suggests the involvement of dark excitons in the energy transfer process.

scholarly journals Direct energy transfer from photosystem II to photosystem I confers winter sustainability in Scots Pine

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Pushan Bag ◽  
Volha Chukhutsina ◽  
Zishan Zhang ◽  
Suman Paul ◽  
Alexander G. Ivanov ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Scots Pine ◽  
Photosystem I ◽  
Photosynthetic Apparatus ◽  
Chloroplast Ultrastructure ◽  
Composition Analysis ◽  
Seasonal Adjustment ◽  
Direct Energy ◽  
Direct Energy Transfer

AbstractEvergreen conifers in boreal forests can survive extremely cold (freezing) temperatures during long dark winter and fully recover during summer. A phenomenon called “sustained quenching” putatively provides photoprotection and enables their survival, but its precise molecular and physiological mechanisms are not understood. To unveil them, here we have analyzed seasonal adjustment of the photosynthetic machinery of Scots pine (Pinus sylvestris) trees by monitoring multi-year changes in weather, chlorophyll fluorescence, chloroplast ultrastructure, and changes in pigment-protein composition. Analysis of Photosystem II and Photosystem I performance parameters indicate that highly dynamic structural and functional seasonal rearrangements of the photosynthetic apparatus occur. Although several mechanisms might contribute to ‘sustained quenching’ of winter/early spring pine needles, time-resolved fluorescence analysis shows that extreme down-regulation of photosystem II activity along with direct energy transfer from photosystem II to photosystem I play a major role. This mechanism is enabled by extensive thylakoid destacking allowing for the mixing of PSII with PSI complexes. These two linked phenomena play crucial roles in winter acclimation and protection.

High-efficiency Energy Transfer from Carotenoids to a Phthalocyanine in an Artificial Photosynthetic Antenna¶

2002 ◽  
Vol 76 (1) ◽  
pp. 116 ◽  
Author(s):  
Ernesto Mariño-Ochoa ◽  
Rodrigo Palacios ◽  
Gerdenis Kodis ◽  
Alisdair N. Macpherson ◽  
Tomas Gillbro ◽  
...  
Keyword(s):  
Energy Transfer ◽  
High Efficiency ◽  
Artificial Photosynthetic ◽  
Photosynthetic Antenna
Sign in / Sign up

Export Citation Format

Share Document