Anogenital distance and its application in environmental health research

Anogenital distance (AGD), a useful anthropometric measurement for genital development in both animals and humans, was originally found by reproductive toxicologists in rodent experiments. As an easy-to-measure and sensitive marker, AGD has become a bioassay of fetal androgen action and a well-established reproductive toxicity endpoint in animals. It is generally accepted that AGD is sexually dimorphic in many mammals, with males having longer AGD than females. Exposure to proposed endocrine disruptors may result in reduced AGD; thus, it has been used to measure health effects of compounds with endocrine-altering properties or endocrine-disrupting chemicals (EDCs) in environmental toxicology. Moreover, AGD is an important clinical measure to address endocrine-sensitive endpoints in the first year of life and to assess the adverse impact of in utero exposure to environmental EDCs. Recently, AGD has been identified as one of the endpoints in the US Environmental Protection Agency guidelines for reproductive toxicity studies in humans, but use of AGD in human studies is still rare, and the results remain mixed and inconclusive due to many reasons. In order to achieve a breakthrough, researchers are endeavoring to standardize the measurement of AGD, normalize age-specific population data in different ethnic groups, and conduct more in-depth human researches in this field.     

中国城市环境综合整治定量考核的经验与理论研究

中国城市环境综合整治定量考核制度实质上是建立一种以城市政府为对象的激励机制,以推动城市政府更有效地改善城市环境质量.此项制度实行以来,城市环境质量得以稳定与改善,但其效果、成本等仍需进一步评价,其理论也需进一步探讨.     

乡域资源与环境协调发展的实践与探讨——以山东省枣庄市萝藤乡为例

本文通过山东省枣庄市峄城区萝藤乡建立生态经济乡途径研究的实践,探讨了在乡域实现资源与环境协调发展的新思路,为我国农村现代化建设做出了有益的尝试。     

国外环境保护信息系统现状与进展

详细介绍了国外利用3S技术建立环境保护信息系统的状况,对其发展进行了展望。     

土壤有机污染通风去除技术

对土壤通风去除石油产品污染研究进行综述，介绍了每项研究内容，分析了主要结论与不足，提出了该项研究今后方向。     

纳氏试剂比色法测定水质中氨氮时温度对纳氏试剂的影响

文中探讨了纳氏比色法测定水质重氨氮过程中温度对纳氏试剂配制和贮存的影响，并提出了解决措施和注意事项。     

水环境质量评价标准探讨

水环境质量评价指标是开展评价工作的依据，本文针对地表水体质量标准、底泥质量标准和水生生物质量标准及共统一结合问题进行了探讨，为全面开展水环境质量评价提供更科学的决策依据。     

凤眼莲(Eichhornia crassipes Solms)对染料色水脱色作用的初步研究

经凤眼莲对染料色水的脱色作用静态试验表明,凤眼莲对阳离子、活性、直接、还原和酸性等染料有显著的脱色作用,其中对阳离子染料的脱色尤为有效,脱色率最高可达98％。还进行了小型动态实验,并建立了一个反映脱色率与进水色度、色水停留时间和凤眼莲生物量等参数间相关关系的数学模型。试验结果表明,凤眼莲的脱色作用具有酶促反应的若干特点,Ca~(2+)、Mn~(2+)等离子的存在可使脱色率显著提高。     

陕西小秦岭高山河地区金矿流体包裹体特征及成矿物理化学条件

小秦岭高山河地区金矿受太古界太华群变质基底与中元古界蓟县系高山河组碎屑岩盖层之间的区域不整合面及其叠加断裂构造控制。矿床形成于中低温中浅成环境，成矿流体作为低盐度低密度，成分以Na+、K+、Cl-、Ca2+为主，金矿形成于中性-弱碱性还原条件。热液上升到浅部，由于温度压力和二氧化碳逸度降低，并与围岩交代反应促使金在不整合面附近的断裂中充填成矿。     

某食品有限公司废水处理站工艺设计

根据对某食品有限公司废水的实验研究和我们的工程实践经验,对该生产工艺各工序的废水分别进行预处理,全厂综合废水进行序批式活性污泥法(SBR法)的处理工艺,预期出水达到二级排放标准,同时实现了废料回收。具有较好的环境效益和经济效益。