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961.
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963.
Ting T. Liao Ru W. Jia Xiao H. Fu Hong Chua 《Journal of environmental science and health. Part. B》2013,48(10):760-768
Membrane damage related to morphological change in Vero cells is a sensitive index of the composite biotoxicity of trace lipophilic chemicals. However, judging whether the morphological change in Vero cells happens and its ratio are difficult because it is not a quantitative characteristic. To find biomarkers of cell morphological change for quantitatively representing the ratio of morphological changed cell, the mechanism of cell membrane damage driven by typical lipophilic chemicals, such as trichlorophenol (TCP) and perfluorooctanesulphonate (PFOS), was explored. The ratio of morphologically changed cells generally increased with increased TCP or PFOS concentrations, and the level of four major components of phospholipids varied with concentrations of TCP or PFOS, but only the ratio of phosphatidylcholine (PC)/phosphatidylethanolamine (PE) decreased regularly as TCP or PFOS concentrations increased. Analysis of membrane proteins showed that the level of vimentin in normal cell membranes is high, while it decreases or vanishes after TCP exposure. These variations in phospholipid and membrane protein components may result in membrane leakage and variation in rigid structure, which leads to changes in cell morphology. Therefore, the ratio of PC/PE and amount of vimentin may be potential biomarkers for representing the ratio of morphological changed Vero cell introduced by trace lipophilic compounds, thus their composite bio-toxicity. 相似文献
964.
Zhou Ren Zhang Lei Yan Jia Sun Yu Jiang Hong 《Environmental science and pollution research international》2023,30(6):14533-14544
Environmental Science and Pollution Research - Sleep problems are common in modern society and may be related to environmental chemicals. The objective of this study is to investigate the... 相似文献
965.
Xu Zhixiang Jia Yue Huang Bin Zhao Dimeng Long Xin Hu Siyuan Li Caiqing Dao Guohua Chen Bo Pan Xuejun 《Environmental Chemistry Letters》2023,21(4):2285-2309
Environmental Chemistry Letters - With the extensive production and use of antibiotics for medicinal and veterinary purposes, antibiotics and genes that code for antibiotic resistance are now... 相似文献
966.
Yang Xiuping Jia Yunting Zhang Dacheng Zhang Xuemei Zhang Hua Hou Yujun 《Environmental science and pollution research international》2020,27(32):40020-40040
Environmental Science and Pollution Research - Given the relatively harsh natural environment in semi-arid valley areas, the attraction and radiation functions of semi-arid valley cities have... 相似文献
967.
Su Z. Qi Xiao F. Chen Yong Liu Jia Z. Jiang 《Journal of environmental science and health. Part. B》2013,48(7):456-462
Tebuconazole is a chiral triazole fungicide used as raceme in a variety of agricultural applications. Earlier studies showed that tebuconazole is toxic to many non-target aquatic organisms but relative data for tebuconazole enantiomers are lacking. Thus, goal of this study was to evaluate and compare the toxicity of rac- and S-tebuconazole with Daphnia magna at both acute and chronic levels according to Organization for Economic Cooperation and Development (OECD) guidelines 202 and 211 respectively, to provide some guidelines for optimizing chiral pesticides application and management. The exposure concentrations were 0.1, 0.5, 1, 2, 4, 8, 10 mg L?1 for both rac- and S-tebuconazole and their 48-h EC50 values to D. magna were 3.53 (3.32–3.78) and 2.74 (2.33–3.10) mg L?1 respectively, indicating that these both are medium toxic to D. magna with no significant toxicity difference at acute level. In chronic test, <24-h old D. magna were exposed to 0.01, 0.05, 0.10, 0.20, and 0.40 mg L?1 of rac- and S-tebuconazole with one blank and one solvent control for 21 days according to OECD guideline 211. Four developmental (molting rate, days to the 1st and 3rd brood, and body length) and five reproductive (size of the 1st and 3rd brood, number of broods, and number of neonates) parameters for each D. magna were determined. Results showed that both rac- and S-tebuconazole significantly reduced the reproduction and impacted the development of D. magna at concentrations of 0.05 mg L?1 or higher. Furthermore, S-tebuconazole was more toxic than raceme, and the difference between effects on the same parameters induced by rac- and S-tebuconazole was statistically significant. These results demonstrated that the chronic toxicity of S-tebuconazole might be underestimated in general use, and further studies should focus more on the biological behaviors of enantiomers and not just the raceme of tebuconazole and other chiral pesticides in the environment. 相似文献
968.
高酚焦化废水萃取脱酚预处理 总被引:1,自引:0,他引:1
为了降低高酚焦化废水中挥发酚的浓度,实验研究了磷酸三丁酯煤油溶液在不同条件下对高酚焦化废水进行萃取脱酚预处理的效果。结果表明,萃取时间为8min,磷酸三丁酯煤油浓度为30%,温度低于40%,pH低于8.0,萃取比(油/水)R=1:2时,经过萃取后分水挥发酚浓度由4165mg降低到127.62mg/L,去除率高达96.94%,为后续生化处理奠定了基础。而萃取剂经过氢氧化钠溶液反萃取再生后,萃取剂的回收利用率可达94.25%以上。 相似文献
969.
Wang Jian Meng Qingyue Winnie Yip Sun Qiang Qu Jiangbin Jia Liying 《中国人口.资源与环境(英文版)》2013,11(1):81-87
Abstract The objective of social development is to construct a harmonious society. In China, the key to a harmonious society is the happiness of more than 900 million farmers living in the rural areas. This study aimed to measure rural residents’ subjective well-being (SWB) through the day reconstruction method, as well as to analyze SWB’s influencing factors through a variety of statistical methods. The results showed that the average U index was 12.79%, indicating that respondents were unhappy 12.79% of the time. Twenty-seven percent of the population had a U index greater than 0, with the average value being 47%, indicating that these people were unhappy 47% of the time. The study also found that SWB varied according to the characteristics of the respondents. Logistic regression analysis showed that social and demographic factors, including age, education, county, household size, generation number, per capita income, migration status and social networking, which significantly affected rural residents’ SWB. The size of the impact varied with the different factors. 相似文献
970.
稠油热采作业是海上平台一项高风险作业,南堡油田是多元热流体吞吐稠油热采作业的实验基地,通过几年的现场实践和持续改进,形成了热采等高风险作业系统的安全管理方法.在人员管理方面实行个体差异化管理,人员编制上采取定编定岗制度,根据工作态度实行刚性和弹性管理.以体系为基础,细化安全工具,推出区域承包责任制、五分钟示范教育、安全协管员、作业许可证双签、四定原则和过程风险控制等一系列有效措施.通过制约因素分析、细化工作界面、关键参数跟踪、阶段性纠偏总结会等提高质量管理.该套风险控制方法确保了八井次热采以及其他多项高风险作业的安全顺利进行,并被固化下来组成了油田的安全文化. 相似文献