Mutual detoxification of mercury and selenium in unicellular Tetrahymena

Selenium(Se) is commonly recognized as a protective element with an antagonistic effect against mercury(Hg) toxicity. However, the mechanisms of this Hg–Se antagonism are complex and remain controversial. To gain insight into the Hg–Se antagonism, a type of unicellular eukaryotic protozoa(Tetrahymena malaccensis, T. malaccensis) was selected and individually or jointly exposed to two Hg and three Se species. We found that Se species showed different toxic effects on the proliferation of T. malaccensis with the toxicity following the order:selenite(Se(IV)) selenomethionine(SeMeth) selenate(Se(VI)). The Hg–Se antagonism in Tetrahymena was observed because the joint toxicity significantly decreased under co-exposure to highly toxic dosages of Hg and Se versus individual toxicity. Unlike Se(IV) and Se(VI), non-toxic dosage of SeM eth significantly decreased the Hg toxicity, revealing the influence of the Se species and dosages on the Hg–Se antagonism. Unexpectedly, inorganic divalent Hg(Hg~(2+)) and monomethylmercury(MeHg) also displayed detoxification towards extremely highly toxic dosages of Se, although their detoxifying efficiency was discrepant. These results suggested mutual Hg–Se detoxification in T. malaccensis, which was highly dependent on the dosages and species of both elements. As compared to other species, SeM eth and MeHg promoted the Hg–Se joint effects to a higher degree. Additionally, the Hg contents decreased for all the Hg–Se co-exposed groups, revealing a sequestering effect of Se towards Hg in T. malaccensis.     

大气污染环境下传统康复技能培训在精准扶贫中的应用性探索

在大气污染环境下,传统的康复技能培训能带动地方区域性经济发展,实现精准扶贫,为了定量分析大气污染环境下传统康复技能培训和地区性经济增长关系,提高精准扶贫力度,提出一种基于模糊评价决策的传统康复技能培训经济促进性效益评估模型,并应用在精准扶贫中。构建大气污染环境下传统康复技能培训的经济促进性增长约束变量,结合FMOLS和DOLS方法进行传统康复技能培训在精准扶贫中的促进性指标参量分析,建立精准扶贫的资金回报动态规划模型,采用模糊决策评价决策方法实现康复技能培训的效益评估。     

电化学方法用于酸性红B模拟废水脱色试验研究

本文研究了两种电极材料 (SnO2 Ti和RuO2 Ti)对酸性红B模拟废水的脱色效果 ,考察了不同 pH、电流密度(j)及外加电解质 (Na2 SO4/NaCl)对处理过程的影响。结果表明 ,两种电极材料都能对酸性红B染料废水进行有效脱色 ,主要是Cl-在电解过程中的间接氧化作用 ,同时也包括电极表面的直接氧化作用。     

电磁防护技术和防护装备

电磁辐射(EMI)污染已被公认为大气污染、水质污染、噪音污染之外的第四大公害，电视广播发射塔、雷达站、通信发射台、变电站、高压电线，还有电脑、手机、微波炉、电磁灶，甚至我们乘坐的地铁列车等等都能制造电磁辐射污染。它无色、无味、无形，可以穿透包括人体在内的多种物质，人体如果长期暴露在超过安全的辐射剂量下，细胞就会被大面积杀伤或杀死，从而引发多种疾病。     

微生物法处理含铬(Ⅵ)废水的研究

采用硫酸盐还原菌处理含铬(Ⅵ)废水，研究了其去除铬(Ⅵ)的最适宜工艺条件。实验表明，该菌的适用范围广，处理含铬废水的能力强。在菌液与废液体积比为1．0：1、铬(Ⅵ)质量浓度为150mg／L条件下处理36h，铬(Ⅵ)去除率达99．9％。     

冷原子荧光法测定水中痕量汞的改进

对冷原子荧光法测定地表水及工业废水中汞的分析处理方法提出改进措施，改进的方法准，快，简，省，符合监测规范要求。     

水温及污泥龄对生物处理系统运行的影响

水温和污泥龄对硝化作用有着重要的影响；水温和污泥龄对污泥增长量也起着主导性作用。指出水温对难降解程度有重大影响。     

环境监测中氯化氢测定的分析方法试验

针对国家标准《HJ/T27-1999》与《空气和废气监测分析方法》的2种氯化氢测定方法中氢化钾用不同介质进行稀释，和显色时间及试剂加入量的区别进行正交试验，得出结果。     

锌对酒精发育毒性的拮抗作用

孕期饮酒导致胚胎和胎儿出生前后一系列机体发育异常及功能缺陷，孕期饮酒还可导致微量元素锌大量丢失。该文应用已建立的体外酒精致畸模型，以全胚胎培养技术探讨了锌对酒精发育毒性的拮抗作用。结果表明，２μｇ／ｍｌ的锌，对２００ｍｇ／ｄｌ的酒精所致的胚胎生长发育指标无明显作用；５μｇ／ｍｌ锌，能显著改善胚胎的蛋白质、ＤＮＡ含量、ＶＹＳ直径等指标；１０μｇ／ｍｌ锌，对胚胎的生长发育和胚胎器官形态分化无明显改善作     

Purification function of the natural wetland in the Liaohe Delta

１ＩｎｔｒｏｄｕｃｔｉｏｎＳｔｒｕｃｔｕｒｅ，ｆｕｎｃｔｉｏｎａｎｄｃｈａｎｇｅａｒｅｔｈｒｅｅｉｍｐｏｒｔａｎｔａｓｐｅｃｔｓｏｆｌａｎｄｓｃａｐｅｅｃｏｌｏｇｙ（Ｆｏｒｍａｎ，１９８６）．Ｌａｎｄｓｃａｐｅｆｕｎｃｔｉｏｎｍｅａｎｓｔｈｅｉｎｔｅ...