This paper describes experiments on the effects of ultraviolet radiation and of x-rays on the eggs and sperm of the sea urchin Arbacia punclulata, carried out during the summer of 1950.1 These, together with earlier findings already described (Blum and Price, 1950 a, b; Blum, Loos, and Robinson, 1950) permit certain conclusions to be reached regarding the locus of action of these radia-' tions,...

The effects of ultraviolet (254 nm) radiation on a hydrated gelatin-glucose matrix were investigated for the development of a physiologically thermostable substrate for potential use in cell scaffold production. Experiments conducted with a differential scanning calorimeter indicate that ultraviolet irradiation of gelatin-glucose hydrogels dramatically increases thermal stability such that no m...

We present a study detailing the effects of refraction on the analysis and interpretation of line-of-site optical probe characterization techniques within laser-produced plasmas. Results using x-ray laser backlit grid deflectometry and ray-tracing simulations illustrate the extent to which refraction can be a limiting factor in diagnosing high-density, short-scale-length plasmas. Analysis is ap...

Since the discovery of the enzyme arginase in extracts of mammalian liver , many investigators have reported the presence of arginase activtiy in many other tissues and various neoplastic tissues. In 1948 , Mardashev, Semina and Van Scott demonstrated, independently , that the arginase activity in the skin was located predominantly in the epidermis. Enzyme activity was also found to be signific...

background: organophosphorus pesticides are one of the most consumable poisons. such poisons can enter water sources by different routes. since consuming some drinking water containing an amount of poison higher than the standard level, causes undesirable effects on human health. this research aimed to study the effectiveness of elimi­nating malathion from water by ultraviolet irradiation (uv) ...

background: carbaryl (1-naphthyl-n-methyl carbamate) is a chemical in the carbamate family used chiefly as an insecticide. it is a cholinesterase inhibitor and is toxic to humans and classified as a likely human carcinogen. in the present study, the degradation of the carbaryl pesticide was investigated in the laboratory synthetic samples of tap water, in the effect of sonolysis and photolysis ...

background: benzene is one of the most widely used volatile organic compounds showing severely adverse effects on human health. removing benzene from the airflow or controlling its amounts, is one of the issues put to discussion in the field of environmental engineering. the objective of this study was to examine the efficacy of the ultraviolet-c (uv-c) radiations on removing benzene from the a...

The ultraviolet radiation present in sunlight is immune suppressive. Recently we showed that solar-simulated ultraviolet radiation (ultraviolet A + B; 295-400 nm), applied after immunization, suppressed immunologic memory and the elicitation of delayed-type hypersensitivity to the common opportunistic pathogen, Candida albicans. Further, we found that wavelengths in the ultraviolet A region of ...

Test Systems. Tagetes erecta L., Dwarf Pigmy French Marigold (Burpee 4166) was planted in soil in polyethvlene boxes; radiation treatments were started immediately. Impatiens Balsamina L.. Holsti Hybrid (Burpee 4107) and Lycopersicon esculenturit Mill., Rutgers (Burpee 5061) were similarly grown; radiation treatments were started when the seedlings were 1 cm tall. One week after planting, the s...