light harvesting
Recently Published Documents


TOTAL DOCUMENTS

5865
(FIVE YEARS 994)

H-INDEX

161
(FIVE YEARS 20)

Author(s):  
Xinxue Wu ◽  
Chaolong Fang ◽  
Wangdong Xu ◽  
Dawei Zhang

2022 ◽  
Vol 23 (2) ◽  
pp. 778
Author(s):  
Aurélie Crepin ◽  
Erica Belgio ◽  
Barbora Šedivá ◽  
Eliška Kuthanová Trsková ◽  
Edel Cunill-Semanat ◽  
...  

Antenna proteins play a major role in the regulation of light-harvesting in photosynthesis. However, less is known about a possible link between their sizes (oligomerization state) and fluorescence intensity (number of photons emitted). Here, we used a microscopy-based method, Fluorescence Correlation Spectroscopy (FCS), to analyze different antenna proteins at the particle level. The direct comparison indicated that Chromera Light Harvesting (CLH) antenna particles (isolated from Chromera velia) behaved as the monomeric Light Harvesting Complex II (LHCII) (from higher plants), in terms of their radius (based on the diffusion time) and fluorescence yields. FCS data thus indicated a monomeric oligomerization state of algal CLH antenna (at our experimental conditions) that was later confirmed also by biochemical experiments. Additionally, our data provide a proof of concept that the FCS method is well suited to measure proteins sizes (oligomerization state) and fluorescence intensities (photon counts) of antenna proteins per single particle (monomers and oligomers). We proved that antenna monomers (CLH and LHCIIm) are more “quenched” than the corresponding trimers. The FCS measurement thus represents a useful experimental approach that allows studying the role of antenna oligomerization in the mechanism of photoprotection.


Planta ◽  
2022 ◽  
Vol 255 (2) ◽  
Author(s):  
Alexander G. Ivanov ◽  
Marianna Krol ◽  
Leonid V. Savitch ◽  
Beth Szyszka-Mroz ◽  
Jessica Roche ◽  
...  

ChemPhotoChem ◽  
2022 ◽  
Author(s):  
Seán Hennessey ◽  
Christopher S Burke ◽  
Roberto González-Gómez ◽  
Debobroto Sensharma ◽  
Wenming Tong ◽  
...  

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 309
Author(s):  
Alexandra Craft Ludvigsen ◽  
Zhenyun Lan ◽  
Ivano E. Castelli

The use of ferroelectric materials for light-harvesting applications is a possible solution for increasing the efficiency of solar cells and photoelectrocatalytic devices. In this work, we establish a fully autonomous computational workflow to identify light-harvesting materials for water splitting devices based on properties such as stability, size of the band gap, position of the band edges, and ferroelectricity. We have applied this workflow to investigate the Ruddlesden-Popper perovskite class and have identified four new compositions, which show a theoretical efficiency above 5%.


2022 ◽  
Author(s):  
Collin Steen ◽  
Adrien Burlacot ◽  
Audrey Short ◽  
Krishna K. Niyogi ◽  
Graham Fleming

Photosynthetic organisms use sunlight as the primary energy source to fix CO2. However, in the environment, light energy fluctuates rapidly and often exceeds saturating levels for periods ranging from seconds to hours, which can lead to detrimental effects for cells. Safe dissipation of excess light energy occurs primarily by non-photochemical quenching (NPQ) processes. In the model green microalga Chlamydomonas reinhardtii, photoprotective NPQ is mostly mediated by pH-sensing light-harvesting complex stress-related (LHCSR) proteins and the redistribution of light-harvesting antenna proteins between the photosystems (state transition). Although each component underlying NPQ has been documented, their relative contributions to the dynamic functioning of NPQ under fluctuating light conditions remains unknown. Here, by monitoring NPQ throughout multiple high light-dark cycles with fluctuation periods ranging from 1 to 10 minutes, we show that the dynamics of NPQ depend on the frequency of light fluctuations. Mutants impaired in the accumulation of LHCSRs (npq4, lhcsr1, and npq4lhcsr1) showed significantly less quenching during illumination, demonstrating that LHCSR proteins are responsible for the majority of NPQ during repetitive exposure to high light fluctuations. Activation of NPQ was also observed during the dark phases of light fluctuations, and this was exacerbated in mutants lacking LHCSRs. By analyzing 77K chlorophyll fluorescence spectra and chlorophyll fluorescence lifetimes and yields in a mutant impaired in state transition, we show that this phenomenon arises from state transition. Finally, we quantified the contributions of LHCSRs and state transition to the overall NPQ amplitude and dynamics for all light periods tested and compared those with cell growth under various periods of fluctuating light. These results highlight the dynamic functioning of photoprotection under light fluctuations and open a new way to systematically characterize the photosynthetic response to an ever-changing light environment.


Author(s):  
Hongling Guo ◽  
Rutao Meng ◽  
Gang Wang ◽  
Shenghao Wang ◽  
Li Wu ◽  
...  

Fabrication of high efficient solar cells is critical for photovoltaic application. The bandgap-graded absorber layer can not only drive carriers efficient collection but also improve the light harvesting. However, it...


Sign in / Sign up

Export Citation Format

Share Document