MEHP induces pyroptosis and autophagy alternation by cathepsin B activation in INS-1 cells

Environmental Science and Pollution Research - Mono-(2-ethylhexyl) phthalate (MEHP) is a primary metabolite of di-(2-ethyl hexyl) phthalate (DEHP) in the organism, which is a major component of...     

Antibiotic accumulation,growth performance,intestinal diversification,and function of Nile tilapia (Oreochromis niloticus) feed by diets supplemented with different doses of sulfamethoxazole

Environmental Science and Pollution Research - To comprehensively investigate the effects of exposure to legal doses of sulfamethoxazole (SMZ) in Nile tilapia (Oreochromis niloticus), fishes were...     

基于AHP的炼化设备管理模糊综合评价模型研究

依据层次分析法(AHP)理论,建立设备管理多层次评价指标,结合各指标重要性确定权重,建立适用于炼化企业的模糊综合评价模型,并以某炼化企业为例,使用该模型对企业设备管理进行定性与定量评估,进行了管理薄弱项的确认及改进措施的制定.     

Difference in calcium ion precipitation between free and immobilized Halovibrio mesolongii HMY2

Biomineralization has become a research focus in wastewater treatment due to its much lower costs compared to traditional methods. However, the low sodium chloride (NaCl)-tolerance of bacteria limits applications to only water with low NaCl concentrations. Here, calcium ions in hypersaline wastewater (10% NaCl) were precipitated by free and immobilized Halovibrio mesolongii HMY2 bacteria and the differences between them were determined. The results show that calcium ions can be transformed into several types of calcium carbonate with a range of morphologies, abundant organic functional groups (C-H, C-O-C, C=O, etc), protein secondary structures (β-sheet, α-helix, 3₁₀ helix, and β-turn), P=O and S-H indicated by P2p and S2p, and more negative δ¹³C_PDB (‰) values (-16.8‰ to -18.4‰). The optimal conditions for the immobilized bacteria were determined by doing experiments with six factors and five levels and using response surface method. Under the action of two groups of immobilized bacteria prepared under the optimal conditions, by the 10^th day, Ca²⁺ ion precipitation ratios had increased to 79%-89% and 80%-88% with changes in magnesium ion cencentrations. Magnesium ions can significantly inhibit the calcium ion precipitation, and this inhibitory effect can be decreased under the action of immobilized bacteria. Minerals induced by immobilized bacteria always aggregated together, had higher contents of Mg, P, and S, lower stable carbon isotope values and less well-developed protein secondary structures. This study demonstrates an economic and eco-friendly method for recycling calcium ions in hypersaline wastewater, providing an easy step in the process of desalination.     

Remediation of preservative ethylparaben in water using natural sphalerite: Kinetics and mechanisms

As a typical class of emerging organic contaminants(EOCs), the environmental transformation and abatement of preservative parabens have raised certain environmental concerns. However, the remediation of parabens-contaminated water using natural matrixes(such as, naturally abundant minerals) is not reported extensively in literature. In this study, the transformation kinetics and the mechanism of ethylparaben using natural sphalerite(NS) were investigated. The results show that around 63% of ethy...     

聚苯乙烯微塑料和纳米塑料对萼花臂尾轮虫有性生殖的毒性影响

为探索不同粒径聚苯乙烯微塑料和纳米塑料对轮虫繁殖的影响规律,以萼花臂尾轮虫(Brachionus calyciflorus)为受试生物,探究了3种粒径(100 nm、0.5 μm和1 μm)聚苯乙烯塑料对轮虫有性生殖的影响. 结果表明:①暴露于粒径较小的聚苯乙烯纳米塑料对轮虫的急性毒性较大. ②与对照组相比,暴露于20 mg/L的100 nm聚苯乙烯纳米塑料和0.01、0.1、1、10和20 mg/L的1 μm聚苯乙烯微塑料均导致轮虫种群增长率显著降低(P<0.05). ③聚苯乙烯微塑料和纳米塑料暴露对萼花臂尾轮虫混交率和受精率均有显著影响. ④暴露于10和20 mg/L的100 nm聚苯乙烯纳米塑料均显著抑制萼花臂尾轮虫7 d休眠卵产量(P<0.05),而暴露于0.1 mg/L的1 μm聚苯乙烯微塑料以及0.01、0.1、1、10和20 mg/L的0.5 μm聚苯乙烯微塑料均显著增加轮虫7 d休眠卵产量(P<0.05). 研究显示,在评价聚苯乙烯微塑料和纳米塑料对萼花臂尾轮虫有性生殖影响时,轮虫混交率和休眠卵产量可以作为合适的毒性测试指标.      

The Stakeholder Preference for Best Management Practices in the Three Gorges Reservoir Region

A qualitative analysis of in-depth interviews with 92 farmers and 42 policy managers in Wuxi County, the Three Gorges Reservoir Region, was conducted to identify stakeholder preferences for alternative best management practices (BMPs) and to determine the factors that affect their acceptance. Policy manager support for most of the practices was relatively stronger than support by farmers, except for the grade stabilization structure (GSS), hillside ditch (HD) and constructed wetland alternative, owing to their perceptions of soil benefits, economic advantages and environmental advantages. Farmers opposed those practices that occupied cultivated lands or changed the conventional planting methods, such as field border, conservation tillage (CT) and contour buffer strips. They tended to accept the BMPs with off-farm pollution reduction, such as GSS, riparian forest buffer and HD, and the BMPs associated with soil benefits, such as nutrient management and Terrace. The result that almost all respondents did not accept CT differed from reports in the existing literature. There is a significant correlation between the acceptance of some BMPs and the townships where the farmers lived (P ≤ 0.05). The environmental conditions and social factors would affect farmer support for BMPs, including local soil conditions, farming methods, economic income, education level and age. The economic advantages of the BMPs were the main motivation for farmers to accept the practices. Furthermore, intensive education efforts, financial incentives or economic subsidies may promote the adoption of the BMPs in our study area.     

The effect of interaction between Bacillus subtilis DBM and soil minerals on Cu(Ⅱ) and Pb(Ⅱ) adsorption

The effects of interaction between Bacillus subtilis DBM and soil minerals on Cu(Ⅱ)and Pb(Ⅱ)adsorption were investigated.After combination with DBM,the Cu(Ⅱ)and Pb(Ⅱ)adsorption capacities of kaolinite and goethite improved compared with the application of the minerals independently.The modeling results of potentiometric titration data proved that the site concentrations of kaolinite and goethite increased by 80%and 30%,respectively after combination with DBM.However,the involvement of functional groups in the DBM/mineral combinations resulted in lower concentrations of observed sites than the theoretical values and led to the enhancement of desorption rates by NH_4NO_3 and EDTA-Na_2.The DBM-mineral complexes might also help to prevent heavy metals from entering DBM cells to improve the survivability of DBM in heavy metal-contaminated environments.During the combination process,the extracellular proteins of DBM provided more binding sites for the minerals to absorb Cu(Ⅱ)and Pb(Ⅱ).In particular,an especially stable complexation site was formed between goethite and phosphodiester bonds from EPS to enhance the Pb(Ⅱ)adsorption capacity.So,we can conclude that the DBM–mineral complexes could improve the Cu(Ⅱ)and Pb(Ⅱ)adsorption capacities of minerals and protect DBM in heavy metal-contaminated environments.     

南京市秋季细颗粒物及臭氧生成敏感性初探

为考察江苏省南部地区重点排放源对南京市秋季细颗粒物(PM_(2.5))的贡献率及O_3生成敏感性,采用强力法针对特定排放源及污染物设置不同的排放情景,利用化学传输模拟系统Models-3/Community Multi-scale Air Quality(CMAQ)分析模拟区域内不同情景下地表PM_(2.5)及O_3浓度变化。2012年10月,电厂、钢铁和水泥的污染物排放对南京市PM_(2.5)浓度的平均贡献率分别为6.0%、25.5%和15.9%,对国控站点的贡献率分别为7.2%、17.7%和16.2%。钢铁对下风向区域的地表PM_(2.5)浓度的影响显著高于电厂及水泥部门的排放。从不同情境下模拟O_3地表浓度变化结果看出,南京市城区及下风向区域的O_3浓度随VOC排放削减降低,随NO_x排放削减升高,因而判定南京市秋季O_3生成属于VOC控制区。     

试论职业病危害评价与安全评价的整合

从评价类型、评价程序、评价方法以及政府监管等多方面对职业病危害评价与安全评价进行对比,分析两种评价整合的必要性与可行性,这将简化安全监管部门的工作职能、提高工作效率,同时降低企业的经济负担与时间成本,减少职业卫生评价服务机构与安全评价服务机构重复劳动、提高工作效率、节约社会资源。