scholarly journals Inside Cover: Silica-Supported Silver Nanoparticles with Surface Oxygen Species as a Reusable Catalyst for Alkylation of Arenes (ChemCatChem 1/2010)

ChemCatChem ◽  
2010 ◽  
Vol 2 (1) ◽  
pp. 2-2 ◽  
Author(s):  
Ken-ichi Shimizu ◽  
Yuji Miyamoto ◽  
Atsushi Satsuma
Keyword(s):  
Silver Nanoparticles ◽  
Reusable Catalyst ◽  
Oxygen Species ◽  
Surface Oxygen

Silica-Supported Silver Nanoparticles with Surface Oxygen Species as a Reusable Catalyst for Alkylation of Arenes

ChemCatChem ◽  
2010 ◽  
Vol 2 (1) ◽  
pp. 84-91 ◽  
Author(s):  
Ken-ichi Shimizu ◽  
Yuji Miyamoto ◽  
Atsushi Satsuma
Keyword(s):  
Silver Nanoparticles ◽  
Reusable Catalyst ◽  
Oxygen Species ◽  
Surface Oxygen

Novel Tetrazoles against Acanthamoeba castellanii Belonging to the T4 Genotype

Chemotherapy ◽  
2021 ◽  
Author(s):  
Yassmin Isse Wehelie ◽  
Naveed Ahmed Khan ◽  
Itrat Fatima ◽  
Areeba Anwar ◽  
Kanwal Kanwal ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Silver Nanoparticles ◽  
Reactive Oxygen Species Generation ◽  
Acanthamoeba Castellanii ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Species Determination ◽  
One Pot ◽  
Tetrazole Derivatives

Background: Acanthamoeba castellanii is a pathogenic free-living amoeba responsible for blinding keratitis and fatal granulomatous amoebic encephalitis. However, treatments are not standardized but can involve the use of amidines, biguanides, and azoles. Objectives: The aim of this study was to synthesize a variety of synthetic tetrazole derivatives and test their activities against A. castellanii. Methods: A series of novel tetrazole compounds were synthesized by one-pot method and characterized by NMR and mass spectroscopy. These compounds were subjected to amoebicidal, and cytotoxicity assays against A. castellanii belonging to the T4 genotype and human keratinocyte skin cells respectively. Additionally, reactive oxygen species determination and electron microscopy studies were carried out. Furthermore, two of the seven compounds were conjugated with silver nanoparticles to study their antiamoebic potential. Results: A series of seven tetrazole derivatives were synthesized successfully. The selected tetrazoles showed anti-amoebic activities at 10µM concentration against A. castellanii in vitro. The compounds tested caused increased reactive oxygen species generation in A castellanii, and significant morphological damage to amoebal membranes. Moreover, conjugation of silver nanoparticles enhanced antiamoebic effects of two tetrazoles. Conclusions: The results showed that azole compounds hold promise in the development of new formulations of anti-Acanthamoebic agents.

Lifetime bioaccumulation of silver nanoparticles accelerates functional aging by inactivating antioxidant pathways, an effect reversed by pterostilbene

2021 ◽  
Author(s):  
Zi-Yu Chen ◽  
Yu-Chen Su ◽  
Fong-Yu Cheng ◽  
Shian-Jang Yan ◽  
Ying-Jan Wang
Keyword(s):  
Reactive Oxygen Species ◽  
Silver Nanoparticles ◽  
Adverse Effects ◽  
Signaling Pathways ◽  
Reactive Oxygen ◽  
Engineered Nanoparticles ◽  
Stress Signaling ◽  
Oxygen Species ◽  
Safety Concerns

Engineered nanoparticles raise safety concerns. Silver nanoparticles (AgNPs) exert acute and chronic adverse effects by inducing reactive oxygen species (ROS)-mediated stress signaling pathways. We investigated the mechanisms by which AgNPs...

Antibacterial effects of titanium embedded with silver nanoparticles based on electron-transfer-induced reactive oxygen species

Biomaterials ◽  
2017 ◽  
Vol 124 ◽  
pp. 25-34 ◽  
Author(s):  
Guomin Wang ◽  
Weihong Jin ◽  
Abdul Mateen Qasim ◽  
Ang Gao ◽  
Xiang Peng ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Silver Nanoparticles ◽  
Electron Transfer ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Antibacterial Effects

Pentacenequinone-Stabilized Silver Nanoparticles: A Reusable Catalyst for the Diels–Alder [4 + 2] Cycloaddition Reactions

2016 ◽  
Vol 81 (3) ◽  
pp. 1039-1046 ◽  
Author(s):  
Radhika Chopra ◽  
Kamaldeep Sharma ◽  
Manoj Kumar ◽  
Vandana Bhalla
Keyword(s):  
Silver Nanoparticles ◽  
Diels Alder ◽  
Reusable Catalyst ◽  
Cycloaddition Reactions

On the role of the surface oxygen species during A–H (A = C, N, O) bond activation: a density functional theory study

2015 ◽  
Vol 51 (13) ◽  
pp. 2621-2624 ◽  
Author(s):  
Jong Suk Yoo ◽  
Tuhin S. Khan ◽  
Frank Abild-Pedersen ◽  
Jens K. Nørskov ◽  
Felix Studt
Keyword(s):  
Density Functional ◽  
Bond Activation ◽  
Bond Cleavage ◽  
Oxygen Species ◽  
Final States ◽  
Surface Oxygen ◽  
Density Functional Theory Study ◽  
Reaction Energy ◽  
Functional Theory

During A–H (A = C, N, O) bond cleavage on O* or OH* pre-covered (111) surfaces, the oxygen species play the role of modifying the reaction energy by changing the species involved in the initial and final states of the reaction.

Sign in / Sign up

Export Citation Format

Share Document