Adenovirus has consistently been observed to be the most resistant known pathogen to disinfection by ultraviolet light. This has had an impact on regulations set by the United States Environmental Protection Agency regarding the use of UV disinfection for virus inactivation in groundwater and surface water. In this study, enhancement of UV inactivation of adenovirus was evaluated when hydrogen ...

Ultraviolet (UV-C at 253.7 nm) technology has been the go-to alternative pasteurization and shelf-life extension treatment for beverages for the last two decades. It has been the focal point of non-thermal methods for fruit juice processing and has been studied extensively. UV-C technology has been proven to produce microbiologically safe products with minimal negative impact towards quality of...

We present a complete sample of International Ultraviolet Explorer and Hubble Space Telescope ultraviolet (UV) spectra of Type Ia supernovae (SNe Ia) through 2004. We measure the equivalent width (EW) and blueshifted velocity of the minimum of the one strong UV feature, Fe II λ3250. We also quantify the slope of the near-UV spectra using a new parameter, the “UV ratio.” We find that the velocit...

We propose and demonstrate an electro-optic spatial light modulator using a deep-proton-exchanged waveguide in periodically poled MgO:s-LiTaO3 thin crystal for UV laser light. The fine pixel profile, the good contrast and low driving voltage were accomplished at 355nm wavelength. Keywords-component; proton-exchage; domain inversion; lithium tantalate; spatial light modulator; ultraviolet (UV) l...

Radiochromic film is tested for its broad-band response to ultraviolet (UV) B (290-320 nm) and A (320 nm400 nm), visible and infrared radiation produced by a solar simulator and examined for dosimetry in ultraviolet radiation. Results show that MD-55-2 radiochromic film in solar and fluorescent light sources responds almost exclusively to broad-band UVA radiation with negligible colouration fro...

High sensitivity photodetectors in ultraviolet (UV) and infrared (IR) range have broad civilian and military applications. Here we report on an un-cooled solution-processed UV-IR photon counter based on modified organic field-effect transistors. This type of UV detectors have light absorbing zinc oxide nanoparticles (NPs) sandwiched between two gate dielectric layers as a floating gate. The pho...

We report on the surface modification of Sylgard-184 poly(dimethyl siloxane) (PDMS) networks by ultraviolet (UV) radiation and ultraviolet/ozone (UVO) treatment. The effects of the UV light wavelength and ambient conditions on the surface properties of Sylgard-184 are probed using a battery of experimental probes, including static contact angle measurements, Fourier transform infrared spectrosc...

CI: confidence interval OR: odds ratio UV: ultraviolet I n this month’s Journal of the American Academy of Dermatology online, Lim et al summarize a large body of evidence that relates to the regulation of indoor ultraviolet (UV) tanning. From a public health perspective, the most important aspect of this issue is the association of indoor tanning with melanoma, the leading cause of death among...

Ultraviolet UV absorbance measurements are subject to significant error using a standard spectrophotometer when particles or aggregates that scatter light are present. True UV absorbance for highly turbid waters should be measured using integrating sphere IS spectrophotometry that allows the collection of reflected and transmitted radiation simultaneously. This is especially important when the ...

The aim ofthis study was to examine whether f3-carotene protects against the immunosuppression seen with long-wave ultraviolet-light (UV-A) exposure. Free-living, healthy men, aged 19-39 y received 30 mg fl-carotene/d or a placebo while on a single-menu, low-carotenoid diet. After 28 d all subjects received 1 2 exposures to a UV-A/B light source over a 16d period. The total UV-A dose received r...