Detection and Identification of Free Radicals Generated by UV and Visible Light inEx VivoHuman Skin

2009 ◽  
Vol 31 (5) ◽  
pp. 402-402 ◽  
Author(s):  
Leonhard Zastrow ◽  
Norbert Groth ◽  
Frank Klein ◽  
Dieter Kockott ◽  
Jürgen Lademann ◽  
...  
Keyword(s):  
Free Radicals ◽  
Visible Light ◽  
Detection And Identification

scholarly journals Antiviral Coatings as Continuously Active Disinfectants

2021 ◽  
Author(s):  
Luisa A. Ikner ◽  
Charles P. Gerba
Keyword(s):  
Titanium Dioxide ◽  
Free Radicals ◽  
Nucleic Acids ◽  
Visible Light ◽  
Quaternary Ammonium ◽  
Uv Light ◽  
Virus Transmission ◽  
Antimicrobial Surfaces ◽  
Bacteria And Fungi ◽  
Growth Of Bacteria

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.

scholarly journals Ultraviolet radiation and melanogenesis

2004 ◽  
Vol 12 (4) ◽  
pp. 203-205 ◽  
Author(s):  
Milenko Stanojevic ◽  
Zorica Stanojevic ◽  
Dragan Jovanovic ◽  
Milena Stojiljkovic
Keyword(s):  
Free Radicals ◽  
Visible Light ◽  
Uv Radiation ◽  
Infrared Radiation ◽  
Biological Effects ◽  
Radiation Energy ◽  
Light Radiation ◽  
Melanin Synthesis ◽  
Protection Mechanisms

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.

Detection and identification of various carbon-centred free radicals using N-arylketonitrones: a spin trapping/EPR/MS study

2008 ◽  
Vol 32 (4) ◽  
pp. 680-688 ◽  
Author(s):  
Inas El Hassan ◽  
Laurence Charles ◽  
Robert Lauricella ◽  
Béatrice Tuccio
Keyword(s):  
Free Radicals ◽  
Spin Trapping ◽  
Detection And Identification
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