In the present work, scanning electron microscopical studies on Schistosoma mansoni cercariae exposed to ultraviolet irradiation (UV-irradiation) were done to answer the question: Is the damage inflicted seen on the adult schistosome worms developed from irradiated cercariae, due to direct effect of UV-irradiation on cercariae or due to the host's immunogenicity induced by UVirradiated cercaria...

Sweet basil (Ocimum basilicum Linnaeus) is aromatic herb that has been utilized in traditional medicine. To improve the phytochemical constituents and pharmaceutical quality of sweet basil leaves, ultraviolet (UV)-B irradiation at different intensities (2.30, 3.60, and 4.80 W/m²) and durations (4, 6, 8, and 10-h) was applied at the post-harvest stage. Total flavonoid content (TFC) and total phe...

Membrane processes such as microfiltration, ultrafiltration, nanofiltration and reverse osmosis have been popular subject for researchers interested in water filtration system. One of the main problems with such membrane system is biofouling, which is caused by deposition or growth of microorganisms on membrane surface. One solution to this problem, as it has been used for many years now, is ch...

The effect of uv irradiation on the solid solutions of MTHF and EtOH containing CuCl with HCl has been investigated. The axial ESR spectra observed before uv irradiation at 73 K for these solutions indicate that Cu(II) ions exist in such a way that the unpaired electron density locates on 3d 9 orbital in the coordination structure associated with the ligand molecules. The new ESR signals observ...

Background: Titanium dioxide (TiO2)-mediated photocatalysis has been found to be an efficient method of water treatment and is capable of degrading a wide range of organic pollutants and microbial agents with high efficiency. The microorganism Pseudomonas aeruginosa is resistant to chemicals and UV irradiation. Bacteria which are resistant to UV-induced oxidative damage of the cell membrane are...

Langerhans cells (LC) are found in virtually all epithelial surfaces, but are rare or absent in the central cornea. LC migration into the cornea can be induced by several different stimuli. The authors studied LC in guinea pig corneal epithelium after: (1) suture placement; (2) suture removal; (3) UV-A irradiation; and (4) UV-C irradiation. Corneal LC markedly increased after suture placement d...

The graphene oxide (GO) film was reduced by ultraviolet (UV) irradiation which removed the oxygen-containing groups of the GO, confirmed by X-ray and Raman photoelectron spectroscopies, and scanning electron microscopy. The UV reduction of the GO film was performed at the selective areas for patterning. The sheet resistance of the GO film decreased from 10 (non-conducting) to 10 / by UV irrad...

We model numerically the mechanical effects of UV induced photo-polymerization in elastomeric artificial lens. The elastomer is originated upon cross-linking of a silicone matrix. UV irradiation of one side of the lens polymerizes selectively a photosensitive macromer, causing local variations of its concentration. The subsequent diffusion of macromers from high concentration to low concentrati...

Total coliforms and total coliforms resistant to streptomycin, tetracycline, or chloramphenicol were isolated from filtered activated sludge effluents before and after UV light irradiation. Although the UV irradiation effectively disinfected the wastewater effluent, the percentage of the total surviving coliform population resistant to tetracycline or chloramphenicol was significantly higher th...

BACKGROUND Melanocytes are producing melanin after UV irradiation as a defense mechanism. However, UV-induced damage is involved in melanoma initiation, depending on skin phototype. Melanocytes seem to be extremely susceptible to free radicals. Their main enzymatic antioxidants are superoxide dismutase and catalase. AIM To study how melanin synthesis modulates the activity of the oxidative st...