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331.
XIA Qing KONG Deyang LIU Guoqiang HUANG Qingguo ALALEWI Aamr LU Junhe 《Frontiers of Environmental Science & Engineering》2014,8(3):372
The removal of 17β-estradiol (E2) in laccase catalyzed oxidative coupling processes was systematically studied in this work. We focused on the influence of pH and natural organic matter (NOM) on the performance of the enzymatic treatment processes. It was found that the optimal pH for E2 removal was between 4 and 6. The removal of E2 was slightly inhibited in the presence of NOM. Enzymatic transformation of E2 was second-order in kinetics with first-order to both the concentrations of the enzyme and contaminant. Mass spectrum (MS) analysis suggested that coupling products were formed through radical-radical coupling mechanism. The results of this study demonstrated that laccase catalyzed oxidative coupling process could potentially serve as a treatment strategy to control steroid estrogens. 相似文献
332.
环境内分泌干扰化合物干扰胰岛素分泌潜在作用机理 总被引:2,自引:1,他引:1
不断升高的糖尿病发病率在全球范围内引起广泛关注,流行病学调查显示糖尿病发病率的增加与环境内分泌干扰化合物使用量增大之间存在显著相关,环境内分泌干扰化合物可能增加糖尿病发病风险,是影响糖尿病的危险因素。在此背景下,综述了环境内分泌干扰化合物暴露与糖尿病发病之间的流行病学关系;环境内分泌干扰化合物暴露对胰岛β细胞胰岛素分泌的调节、高胰岛素效应及其潜在的作用机理,表明影响胰岛素分泌是环境内分泌干扰化合物调节代谢,诱发糖尿病的重要作用机制。 相似文献
333.
改革开放以来,由于企业安全生产薄弱的基础没有得到根本的改善,重大、特大生产事故频发,安全生产形势依然严峻。笔者在对我国安全生产管理模式回顾的基础上,提出了在市场经济条件下,加强国家安全生产立法、执法,建立企业安全生产自我约束机制和安全生产预警系统,用新的安全生产管理机制来提高安全生产管理水平的思考。 相似文献
334.
335.
Zhan Wang Chongyang Shen Yichun Du Yulong Zhang Baoguo Li 《Frontiers of Environmental Science & Engineering》2019,13(5):79
336.
337.
用直径50cm 的聚乙烯漏斗,在冬夏两季分别截获了白天和夜间的干降尘。结果表明,干降尘中主要阳离子是钙,虽然它吸附二氧化硫,但不酸。计算表明城区干降尘能中和降水中11.8%的酸,四面山中和6.2%。 相似文献
338.
Four umbric A horizons from acid forest soils were acidified in a batch type experiment and its effect in the Al pools of
the solid phase analysed by means of selective dissolution methods. The results showed that Al release accounted for the consumption
of 85–99% of the added protons, and causes a decrease of 2–33% of the ‘reactive’ Al pool of the soil solid phase. In these
A horizons, inorganic non-crystalline Al and high stability Al-humus complexes are the main sources of the dissolved Al. The
contribution of the complexes with intermediate stability only was relevant in the more acid horizon developed from phyllites
(P18-A). The increase of equilibration time from 96 to 720 h did not caused significant differences in the decrease of the
‘reactive’ Al pool suggesting the acid neutralising reactions occurred in less than 96 h. In most cases the quantity of released
Al is in agreement with the decrease of the different reactive Al pools of the solid phase. 相似文献
339.
Tapping the leakages: Methane losses, mitigation options and policy issues for Russian long distance gas transmission pipelines 总被引:1,自引:0,他引:1
Stefan Lechtenbhmer Carmen Dienst Manfred Fischedick Thomas Hanke Roger Fernandez Don Robinson Ravi Kantamaneni Brian Gillis 《International Journal of Greenhouse Gas Control》2007,1(4):387-395
The Russian natural gas industry is the world's largest producer and transporter of natural gas. This paper aims to characterize the methane emissions from Russian natural gas transmission operations, to explain projects to reduce these emissions, and to characterize the role of emissions reduction within the context of current GHG policy. It draws on the most recent independent measurements at all parts of the Russian long distance transport system made by the Wuppertal Institute in 2003 and combines these results with the findings from the US Natural Gas STAR Program on GHG mitigation options and economics.With this background the paper concludes that the methane emissions from the Russian natural gas long distance network are approximately 0.6% of the natural gas delivered. Mitigating these emissions can create new revenue streams for the operator in the form of reduced costs, increased gas throughput and sales, and earned carbon credits. Specific emissions sources that have cost-effective mitigation solutions are also opportunities for outside investment for the Joint Implementation Kyoto Protocol flexibility mechanism or other carbon markets. 相似文献
340.