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Clearing of the Radioactive Liquid Waste from Oils and Oil Products by uv-radiation at NPPs

Journal of Power and Energy Engineering 2015年第4期3卷 35-40页

作者： Sergey A. Kulyukhin Vladimir V. Kulemin Vladimir B. Krapukhin Viktor A. Lavrikov Andrey V. Gordeev Andrey A. Shiryaev Alexey A. Bessonov Frumkin’s Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences Moscow Russia

The basic methods of concentration and purification of liquid radioactive waste on the nuclear power plant are distillation and ionic exchange. During vaporization of oil waste products and the fulfilled washing solutions the part of oil passes into a condensate. Clearing of such condensate on ion-exchanged filters results to oiling of ion-exchanged materials and to decrease number of filter cycles. Due to the often regeneration of ion-exchanged filters additional volumes of waste products as the fulfilled reclaiming solutions, washing and loosening waters are formed. The attention of scientists was involved with methods of clearing of water environments from the organic substances, based on deep oxidizing transformations of hydrocarbons into carbonic gas and water. From processes of oxidation of hydrocarbons up to CO2 and H2O, sold at moderate conditions, our attention has involved photochemical oxidation with the help of uv-radiation.

关键词： Nuclear Power Plant Liquid Radioactive Waste Oil uv-radiation

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The protective effect of zeaxanthin on human limbal and conjunctival epithelial cells against uv-induced cell death and oxidative stress

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International Journal of Ophthalmology(English edition) 2019年第3期12卷 369-374页

作者： Yue Huang Chun Shi Jing Li Department of Ophthalmology Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Department of Ophthalmology Xinhua Hospital Chong Ming Branch Shanghai Jiao Tong University School of Medicine Department of Ophthalmology Jiangwan Hospital of Hongkou District

AIM: To explore the protective effect of zeaxanthin on human limbal and conjunctival epithelial cells against uvradiation and excessive oxidative ***: Human limbal and conjunctival epithelial cells were isolated from cadaver and cultured in vitro. They were challenged with uvB radiation and H2 O2 with and without zeaxanthin pretreatment. Cell viability, p38 and c-JUN NH(2)-terminal kinase(JNK) phosphorylation, IL-6, IL-8 and MCP-1 secretion and malondialdehyde(MDA) content were ***: Zeaxanthin had no measurable cytotoxicity on limbal or conjunctival epithelial cells when used at concentrations of 5 μg/mL and below. At 30 mJ/cm2 uvB, the pretreatment of zeaxanthin increased the percentage of live cells from 50% to 69%(P=0.01) and from 66% to 75%(P=0.05) for limbal and conjunctival epithelial cells, respectively. The concentrations of IL-6, IL-8 and MCP-1 in the culture medium reduced to 66%(for IL-6 and MCP-1)and 56%(for IL-8) of the levels without zeaxanthin. This was accompanied by reduced p38 and JNK protein phosphorylation. Pretreatment of zeaxanthin also reduced intracellular MDA content caused by H2 O2 stimulation from 0.86 μmol/L to 0.52 μmol/L(P=0.02) in limbal epithelial cells and from 0.96 μmol/L to 0.56 μmol/L in conjunctival epithelial cells(P=0.03). However, zeaxanthin did nothave significant effect on H2 O2-induced cell death in limbal or conjunctival epithelial ***: Zeaxanthin is an effective reagent in reducing the detrimental effect of uv-radiation and oxidative stress on ocular surface epithelial cells.

关键词： zeaxanthin uv-radiation oxidative stress malondialdehyde limbal epithelial cells conjunctival epithelial cells

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