Hydroxylated metabolites of polychlorinated biphenyls and their endocrine disrupting mechanism

Hydroxylated polychlorinated biphenyls (OH-PCBs a group of main active metabolites of polychlorinated biphenyl (PCBs) which are typical persistent organic pollutants (Pops) I have been identified in wild animals and human. The endocrine disruption of OH-PCBs has been drawn great attention due to the similarity of their chemical structures to the natural estrogens and thyroid hormones. The metabolic pathways of PCBs, the levels of OHPCBs in organism, the endocrine disruption and other adverse effects of OH-PCBs are reviewed. The further investigation of OH-PCBs will not only reveal the toxicological mechanism of PCBs, but also can lay scientific basis for setting up the risk assessment of POPs contamination and early-warning system in China.

大气环境预警指标体系及方法的研究－－以沈阳市大气环境为例

本文对大气环境预警指标体系和方法进行了研究。综合已有观点，总结出指标体系应满足的9个原则；在深入分析制约大气环境质量的基础上，建立了包括污染源，污染物和污染控制因素的指标体系。同时，以沈阳市大气环境为例，采用对比评价和静态模糊评价相结合的方法进行了大气环境预警实践。最后，针对本文的结果和分析，对沈阳市大气污染控制提出了几点对策几措施。