Acceleration of levofloxacin degradation by combination of multiple free radicals via MoS2 anchored in manganese ferrite doped perovskite activated PMS under visible light

2022 ◽  
Vol 431 ◽  
pp. 133933
Author(s):  
Yuxuan He ◽  
Jin Qian ◽  
Peifang Wang ◽  
Jie Wu ◽  
Bianhe Lu ◽  
...  
2021 ◽  
Author(s):  
Luisa A. Ikner ◽  
Charles P. Gerba

Antimicrobial surfaces and coatings have been available for many decades and have largely been designed to kill or prevent the growth of bacteria and fungi. Antiviral coatings have become of particular interest more recently during the COVID-19 pandemic as they are designed to act as continuously active disinfectants. The most studied antiviral coatings have been metal-based or are comprised of silane quaternary ammonium formulations. Copper and silver interact directly with proteins and nucleic acids, and influence the production of reactive free radicals. Titanium dioxide acts as a photocatalyst in the presence of water and oxygen to produce free radicals in the presence of UV light or visible light when alloyed with copper or silver. Silane quaternary ammonium formulations can be applied to surfaces using sprays or wipes, and are particularly effective against enveloped viruses. Continuously active disinfectants offer an extra barrier against fomite-mediated transmission of respiratory and enteric viruses to reduce exposure between routine disinfection and cleaning events. To take advantage of this technology, testing methods need to be standardized and the benefits quantified in terms of reduction of virus transmission.


2020 ◽  
Vol 9 (2) ◽  
pp. 81-90
Author(s):  
Mohamed M Rezk ◽  
Abdelghaffar S Dhmees ◽  
Mahmoud O Abd El-Magied ◽  
El-Sayed A Manaa ◽  
Hassan S El-Gendy

Abstract Effect of cobalt manganese ferrite nanoparticles (M-NPs) (Co0.5Mn0.5Fe2O4) on vanadium hazards was assessment in the present study. Four groups of adult male albino rats [control group and three variably treated groups with ammonium metavanadate accompanied with or without cobalt M-NPs] were studied. The oral administration of ammonium metavanadate (Am.V) (20 mg/kg b.wt.) demonstrated the facility of vanadium to distribute and accumulate in the distinctive body organs and ordered as kidney > liver > lung > brain > spleen. Also, Am.V administration induce a significant disturbance in many physiological parameters (RBS, cholesterol, triglyceride, aspartate transaminase, alanine transaminase, Alb., bilirubin, Alk.Ph., urea, creat., Hb%, red blood cell count and packed cell volume) which might be expected to the liberation of free radicals according to the vanadium intoxication or its ability to disturb many body metabolisms. On the other hand, the intraperitoneal administration of 5% M-NPs in parallel with Am.V orally administration showed the ability of M-NPs to reduce Am.V dangerous impacts, which might be resulted from the essentiality of M-NPs metals to the body metabolism and to its free radicals scavenging properties. So, M-NPs could reduce Am.V hazardous effects.


2004 ◽  
Vol 12 (4) ◽  
pp. 203-205 ◽  
Author(s):  
Milenko Stanojevic ◽  
Zorica Stanojevic ◽  
Dragan Jovanovic ◽  
Milena Stojiljkovic

Light radiation is a part of the electromagnetic radiation, and it consists of the ultraviolet (UV) radiation, visible light, and infrared radiation. UV radiation energy is absorbed in the form of photons in biomolecules (chromophores) and induces various cellular reactions, out of which photochemical and photosensitizing are the most significant. In contact with the skin UV radiation incites protection mechanisms: the most important are stratum corneum thickening and melanin synthesis (melanogenesis). Basic role of melanin is absorption and scattering of UV rays and neutralization of free radicals. In this review physical characteristics of UV radiation, its biological effects, and relation to melanogenesis and carcinogenesis are discussed.


1982 ◽  
Vol 60 (12) ◽  
pp. 1452-1462 ◽  
Author(s):  
Rolf Joachim Mehlhorn ◽  
Lester Packer

Nitroxide free radicals lost their paramagnetic absorption spectrum when they were illuminated with visible light in aged but not freshly isolated inner mitochondrial membranes (SMP's). The action spectrum of spin loss rates coincided with a flavin absorption spectrum. Spin loss consisted of one-electron reduction and "destruction", the latter being defined as spin loss that cannot be reversed by ferricyanide oxidation. By placing SMP's in gas permeable tubing and illuminating alternately under nitrogen and air, it was possible to discriminate qualitatively between spin reduction and destruction. Aerobic spin loss consisted entirely of destruction. When aged SMP's were centrifuged, spin loss was observed in supernatants but not pellets. Flavin fluorescence was observed in the supernatants, suggesting that free flavins catalyzed spin loss. However, addition of exogenous flavins to fresh SMP's did not cause spin loss; hence some other factor was required to cause nitroxide destruction. This factor accumulates during either aerobic or anaerobic aging of SMP's and may be present in mitochondria. Supernatants of aged SMP's, when added to freshly isolated SMP's, induced rapid nitroxide destruction, slightly accelerated photodamage to succinate oxidase, and considerably increased photo-induced lipid peroxidation.


Author(s):  
Govindarajan Ramadoss ◽  
Shanmugasundaram Prema Suriyaraj ◽  
Ramachandran Sivaramakrishnan ◽  
Arivalagan Pugazhendhi ◽  
Selvakumar Rajendran

2018 ◽  
Vol 8 (10) ◽  
pp. 2540-2545 ◽  
Author(s):  
Yong Xu ◽  
Ling-Zhen Zeng ◽  
Zi-Cheng Fu ◽  
Cong Li ◽  
Zhi Yang ◽  
...  

Hydroxyl free radicals generated by visible-light-catalyzed water splitting over CoP/CdS drive the oxidation of arylalcohols with hydrogen evolution.


2009 ◽  
Vol 31 (5) ◽  
pp. 402-402 ◽  
Author(s):  
Leonhard Zastrow ◽  
Norbert Groth ◽  
Frank Klein ◽  
Dieter Kockott ◽  
Jürgen Lademann ◽  
...  

2016 ◽  
Vol 283 ◽  
pp. 266-275 ◽  
Author(s):  
Yang Zhou ◽  
Bo Xiao ◽  
Shou-Qing Liu ◽  
Zeda Meng ◽  
Zhi-Gang Chen ◽  
...  

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