Effect of Near-Infrared Light on the S2-State of the Manganese Complex of Photosystem II fromSynechococcus elongatus†

Biochemistry ◽  
1998 ◽  
Vol 37 (25) ◽  
pp. 8995-9000 ◽  
Author(s):  
Alain Boussac ◽  
Helena Kuhl ◽  
Sun Un ◽  
Matthias Rögner ◽  
A. William Rutherford
Keyword(s):  
Photosystem Ii ◽  
Near Infrared ◽  
Manganese Complex ◽  
Infrared Light ◽  
Near Infrared Light ◽  
S2 State

Conversion of the Spin State of the Manganese Complex in Photosystem II Induced by Near-Infrared Light

Biochemistry ◽  
1996 ◽  
Vol 35 (22) ◽  
pp. 6984-6989 ◽  
Author(s):  
Alain Boussac ◽  
Jean-Jacques Girerd ◽  
A. William Rutherford
Keyword(s):  
Photosystem Ii ◽  
Spin State ◽  
Near Infrared ◽  
Manganese Complex ◽  
Infrared Light ◽  
Near Infrared Light

The Mechanism Behind the Formation of the “Split S3” EPR Signal in Photosystem II Induced by Visible rr Near-Infrared Light

2008 ◽  
pp. 423-426
Author(s):  
Kajsa G. V. Havelius ◽  
Ji-Hu Su ◽  
Felix M. Ho ◽  
Guangye Han ◽  
Fikret Mamedov ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Epr Signal

scholarly journals Low-temperature photochemistry in photosystem II from Thermosynechococcus elongatus induced by visible and near-infrared light

2007 ◽  
Vol 363 (1494) ◽  
pp. 1203-1210 ◽  
Author(s):  
Alain Boussac ◽  
Miwa Sugiura ◽  
Thanh-Lan Lai ◽  
A. William Rutherford
Keyword(s):  
Photosystem Ii ◽  
Water Oxidation ◽  
Near Infrared ◽  
Infrared Light ◽  
Tyrosyl Radical ◽  
Paramagnetic Resonance ◽  
Near Infrared Light ◽  
Redox Active ◽  
Electron Paramagnetic ◽  
Haem Iron

The active site for water oxidation in photosystem II (PSII) consists of a Mn 4 Ca cluster close to a redox-active tyrosine residue (TyrZ). The enzyme cycles through five sequential oxidation states (S 0 to S 4 ) in the water oxidation process. Earlier electron paramagnetic resonance (EPR) work showed that metalloradical states, probably arising from the Mn 4 cluster interacting with TyrZ, can be trapped by illumination of the S 0 , S 1 and S 2 states at cryogenic temperatures. The EPR signals reported were attributed to S 0 TyrZ, S 1 TyrZ and S 2 TyrZ, respectively. The equivalent states were examined here by EPR in PSII isolated from Thermosynechococcus elongatus with either Sr or Ca associated with the Mn 4 cluster. In order to avoid spectral contributions from the second tyrosyl radical, TyrD, PSII was used in which Tyr160 of D2 was replaced by phenylalanine. We report that the metalloradical signals attributed to TyrZ interacting with the Mn cluster in S 0 , S 1 , S 2 and also probably the S 3 states are all affected by the presence of Sr. Ca/Sr exchange also affects the non-haem iron which is situated approximately 44 Å units away from the Ca site. This could relate to the earlier reported modulation of the potential of Q A by the occupancy of the Ca site. It is also shown that in the S 3 state both visible and near-infrared light are able to induce a similar Mn photochemistry.

An ordered copper nanowell-array film with near-perfect broadband absorption from ultraviolet to near-infrared light

2020 ◽  
Vol 59 (11) ◽  
pp. 110906
Author(s):  
Juan Shen ◽  
Yong Ren ◽  
Xinxin Zhu ◽  
Min Mao ◽  
Quan Zhou ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Broadband Absorption

scholarly journals Recent Near-Infrared Light-Activated Nanomedicine toward Precision Cancer Therapy

2021 ◽  
Author(s):  
Xiaowei Luan ◽  
Yongchun Pan ◽  
Yanfeng Gao ◽  
Yujun Song
Keyword(s):  
Cancer Therapy ◽  
Near Infrared ◽  
Infrared Light ◽  
Human Society ◽  
Near Infrared Light ◽  
History Of ◽  
The Universe

Light has witnessed the history of mankind and even the universe. It is of great significances to the life of human society, contributing to energy, agriculture, communication, and much more....

scholarly journals Au–ZnO Conjugated Black Phosphorus as a Near-Infrared Light-Triggering and Recurrence-Suppressing Nanoantibiotic Platform against Staphylococcus aureus

Pharmaceutics ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 52
Author(s):  
Atanu Naskar ◽  
Sohee Lee ◽  
Kwang-sun Kim
Keyword(s):  
Staphylococcus Aureus ◽  
Bacterial Infections ◽  
Near Infrared ◽  
Au Nanoparticles ◽  
Synthesis Method ◽  
Antibacterial Properties ◽  
Black Phosphorus ◽  
Infrared Light ◽  
Resistant Bacteria ◽  
Near Infrared Light

Antibiotic therapy is the gold standard for bacterial infections treatment. However, the rapid increase in multidrug-resistant (MDR) bacterial infections and its recent use for secondary bacterial infections in many COVID-19 patients has considerably weakened its treatment efficacy. These shortcomings motivated researchers to develop new antibacterial materials, such as nanoparticle-based antibacterial platform with the ability to increase the chances of killing MDR strains and prevent their drug resistance. Herein, we report a new black phosphorus (BP)-based non-damaging near-infrared light-responsive platform conjugated with ZnO and Au nanoparticles as a synergistic antibacterial agent against Staphylococcus aureus species. First, BP nanosheets containing Au nanoparticles were assembled in situ with the ZnO nanoparticles prepared by a low-temperature solution synthesis method. Subsequently, the antibacterial activities of the resulting Au–ZnO–BP nanocomposite against the non-resistant, methicillin-resistant, and erythromycin-resistant S. aureus species were determined, after its photothermal efficacy was assessed. The synthesized nanocomposite exhibited excellent anti-S. aureus activity and good photothermal characteristics. The non-resistant S. aureus species did not produce drug-resistant bacteria after the treatment of multiple consecutive passages under the pressure of the proposed nanoantibiotic, but rapidly developed resistance to erythromycin. This work clearly demonstrates the excellent photothermal antibacterial properties of Au–ZnO–BP nanocomposite against the MDR S. aureus species.

π-Conjugated Copolymers Composed of Boron Formazanate and Their Application for a Wavelength Converter to Near-Infrared Light

2021 ◽  
Vol 54 (4) ◽  
pp. 1934-1942
Author(s):  
Yuki Kawano ◽  
Yoshinori Ito ◽  
Shunichiro Ito ◽  
Kazuo Tanaka ◽  
Yoshiki Chujo
Keyword(s):  
Near Infrared ◽  
Infrared Light ◽  
Wavelength Converter ◽  
Near Infrared Light ◽  
Conjugated Copolymers
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