Clinical toxoplasmosis in humans has been epidemiologically linked to the consumption of drinking water contaminated by Toxoplasma gondii oocysts. We evaluated killing of T. gondii oocysts after ultraviolet (UV) or ozone treatments by bioassay in mice and/or cell culture. A 4-log inactivation of the oocyst/sporozoite infectivity was obtained for UV fluences >20 mJ cm(-2). In contrast, oocysts w...

Photoinhibition is light-induced inactivation of PSII, and action spectrum measurements have shown that UV light causes photoinhibition much more efficiently than visible light. In the present study, we quantified the contribution of the UV part of sunlight in photoinhibition of PSII in leaves. Greenhouse-grown pumpkin leaves were pretreated with lincomycin to block the repair of photoinhibited...

Proper treatment of infectious air could potentially mitigate the spread airborne viruses such as porcine reproductive and respiratory syndrome virus (PRRSV). The objective this research is to test effectiveness ultraviolet (UV) in inactivating aerosolized PRRSV, specifically, four UV lamps, UV-A (365 nm, both fluorescent LED-based), “excimer” UV-C (222 nm), germicidal (254 were tested. two lam...

p53 tumor suppressor gene is the most commonly mutated gene in human and mouse cancers. Disruption of the p53 and Rb pathways is a fundamental trend of most human cancer cells. Inactivation of CDKN2A can lead to deregulation of these two pathways. Genetic abnormalities in CDKN2A gene have been well documented in human melanoma but their involvement in human nonmelanoma skin cancer (NMSC) and in...

The objective of this study was to test the inactivation efficiency of two different light-based treatments, namely ultraviolet B (UVB) and ultraviolet C (UVC) irradiation, on Pseudomonas aeruginosa biofilms at different growth stages (24, 48, and 72 h grown). In our experiments, a type of AlGaN light-emitting diodes (LEDs) was used to deliver UV irradiation on the biofilms. The effectiveness o...

To evaluate and understand inactivation of HRV under many physical conditions and chemical agents, HRV86 were selected to expose with temperature, ultraviolet light (UV), Sodium hypochlorite, Virkon S, Peracetic acid (PAA), Glutaraldehyde and Ethanolin, respectively. The inactivation of HRV was analyzed by infectivity of the viral strains on the HeLa cells. Our research found the rhinovirus was...

UV can achieve the sterilization of clean and nontoxic by-products, article makes clear way in which data such as irradiance dose are taken. The indicates that higher bactericidal efficacy be achieved for most bacteria at doses 4 mJ/cm2 1.0 mW/cm2 0.06-0.30 11 mJ/cm2. value ignored attenuation LED during long-term use. By comparing effect single layered multi-layered bacteria, degree cleanlines...

In Shiga toxin-producing Escherichia coli (STEC), induction of Shiga toxin-encoding bacteriophages (Stx phages) causes the release of free phages that can later be found in the environment. The ability of Stx phages to survive different inactivation conditions determines their prevalence in the environment, the risk of stx transduction, and the generation of new STEC strains. We evaluated the i...