环境荷尔蒙物质及其监测与分析

介绍了环境荷尔蒙物质的种类，致毒机理培的分布情况，并对ｐｐｔ，ｐｐｑ量级的超微量环境污染物质主要是二恶英物质的监测分析方法进行了评述。对监测分析今后的发展，如解决监测信息代表性，多种有机成分同时分析技术，污染综合指标监测及二恶英类物质的监测和存在问题提出了见解。     

Phytoremediation of levonorgestrel in aquatic environment by hydrophytes

Adsorption and degradation of levonorgestrel （LNG） by two hydrophytes, Cyperus alternfolius （CA） and Eichhornia crassipes （EC）, were investigated under light-shielding conditions in the water column. Variations of LNG concentrations in water, plant root epidermis, root, stem and leaf of the plants were analyzed. The results indicated that the removal efficiency of LNG by hydrophytes over the period of 50 days was significantly greater than the blank control （p 〈 0.05）, with the removal rates of 79.80%± 3.10% and 78.86% ± 2.55% for CA and EC, respectively. Compared with bio-adsorption, bio-conversion of LNG was found to be the dominant elimination pathway, evidenced by relatively high conversion rates （77.31% ±2.68% for CA and 77.82% ± 2.95% for EC）, while the adsorption rates were lower （1.77% ± 0.90% for CA and 1.05% ± 0.40% for EC）. The bio-adsorption and conversion of LNG showed no significant differences between the two hydrophytes. Additionally, the mineralization on root epidermis played an important role in the reduction of LNG in water.     

Triangulation theory applied to conflict over hormone herbicide drift in Natal,South Africa

Policies that arise out of conflict or collaboration between specific interest groups and government agencies are often explained by theoretical constructs that fall under the umbrella of group theory. Triangulation theory is one of these constructs and serves to explain the mutuality of interests that exist between government agencies and interest groups expressed as points linking geometric forms. Conflict tends to occur when competing interest groups are excluded from the linkage, in this case between the opponents and proponents of hormone herbicides in the Tala area in Natal, South Africa. In opposition to the use of hormone herbicides were vegetable farmers and their supporters: in linked support were agricultural interest groups who used hormone herbicides, the manufacturers of the herbicides, and the government agency responsible for agriculture. Because of the influence exerted through mutual support by the proponents of hormone herbicides, the formulation of policy decisions directed towards the resolution of the conflict was delayed. When the minister of agriculture finally intervened, the policy decisions were designed to secure the support of those opposing the use of hormone herbicides by introducing issues that cut across those maintaining the discord.     

Effects on Wood Quality Characteristics of Hormone Breeding of Beech Seedlings Treated by Polystimulin-A6

Abstract

The aim of this study is to determine the effectiveness of polystimulin-A6 (PS-A6) on the wood quality characteristics of beech (Fagus orientalis L.) seedlings. In order to examine the seedling development, the total of 1200 seedlings treated with PS-A6 at four different concentrations and a total of 300 control seedlings were measured related to seedling height, root collar diameter, stem dry weight, root dry weight, leaf width, and length. It was also counted the leaf numbers. Finally, it was found that there was a very significant difference between PS-A6 treatments and control treatments. The seedlings treated with PS-A6 seem to perform well in comparison to control seedlings.     

微量元素碘对儿童身心发育影响的研究

本文研究结果表明,在自然环境缺碘地区持续投放含碘浓度25ppm 的“NaCLI—固”后出生的儿童身高体重发育水平接近对照地区的中等水平;缺碘地区儿童甲状腺激素 T_4、T_3、T_4/T_3比值均在正常范围,甲状腺功能状态基本正常,提示机体内环境缺碘程度已得到纠正;缺碘区儿童 IQ 低下检出率明显高于对照区,血清 Zn 水平则无显著性差异,表明这部分低智儿童与在胚胎期间碘元素相对缺乏有着密切关系.