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41.
Faezeh Ghanati Parviz Abdolmaleki Majid Vaezzadeh Elham Rajabbeigi Mohammad Yazdani 《The Environmentalist》2007,27(4):429-434
In the present research, the effects of static magnetic field, with or without iron on the growth, the activity of certain
enzymes (like polyphenol oxidase and phenyle alanine ammonialyase), the content of phenolic compounds and the essential oil
composition of sweet basil (Ocimum basilicum) were studied. Treatment of plants with static magnetic field with or without iron led to decrease of the growth of plants
as well as decrease in the activity of phenyle alanine ammonialyase and of phenolic compounds content. In addition in those
plants exposed to magnetic field the amount of essential oils, notably of methyl chavicol, was increased. Exposure of plants
to the magnetic field decreased the activity of polyphenol oxidase, whereas treatment of plants with iron when exposed to
magnetic field increased polyphenol oxidase activity. In this group the content of essential oil was reduced. 相似文献
42.
G. S. Kalacheva E. S. Zadereev V. G. Gubanov I. V. Gribovskaya 《Russian Journal of Ecology》2000,31(2):113-117
The chemical composition of water conditioned by colonies ofMoina macrocopa and involved in the regulation of their life cycle was analyzed in comparison with water samples from natural water bodies.
Dechlorinated tap water was used as the control medium. The results showed that metabolism of crustaceans leads to an increase
in the concentrations of phosphorus and nitrogen in all forms, the appearance of protein and carbohydrate fractions, and changes
in the composition of lipid fractions in the water conditioned by their colonies. The contents of all organic components are
very low, which makes their identification difficult. Concentrations of substances identified in the conditioned water do
not exceed those occurring in nature. 相似文献
43.
水环境中药品和个人护理用品污染现状及研究进展 总被引:2,自引:0,他引:2
综述了当前国内外药品和个人护理用品(PPCPs)在地表水、地下水和饮用水中的污染现状,介绍了水环境中PPCPs污染的危害及其预测、调查与检测方法。提出了我国水环境中PPCPs污染未来的研究方向,包括改进水处理工艺,提高PPCPs的去除效率;提升分析技术水平,拓宽PPCPs的检测种类;深入研究PPCPs产生的环境效应,重视其职业暴露的污染与危害;建立水环境中PPCPs的预测制度及风险评价体系。 相似文献
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Separate collection of municipal solid waste has overcome the 50% threshold in the Asti District in northern Italy, nearly one-third being composed of household and green organic waste. In order to address present and future solutions, it becomes therefore fundamental to assess the environmental performances of the current management of organic waste from separate collection. A from-gate-to-cradle life cycle assessment (LCA) model has been developed by expanding system boundaries, in order to carry out the assessment in the context of the whole waste management streamline. The environmental performances of an existing aerobic plant were made available, based on field measured data, by paying attention to the role and contribution of waste management subsystems. The need for actual and reliable data on materials and energy input, as well as gross and net gains from materials recovery, including benefits arising from use of compost in farming activities, was probably the major drawback that had to be faced. The study integrated the findings of different investigations from the literature with field measured data in order to obtain a more comprehensive framework representative of the area under study. The results may help public administrators to better understand the suitability of using LCA tools when dealing with solid waste management strategies. 相似文献
47.
采用污水流行病学的方法,研究了2020年新冠疫情期间及前后广东省某市生活污水中两种典型精神药物甲基苯丙胺和氯胺酮的赋存特征及其变化情况,并运用手机信令数据分析人口总数、结构特征及其变动规律,进而将两者结合分析了疫情期间及前后两种药物的消费量变化特征.结果表明,疫情期间该市实际人口相对于疫情前下降了约45%,两种药物总消费量相对于疫情前下降了约75%.总消费量的显著下降很大程度是由疫情期间实际人口下降造成的.实际上,疫情期间该市甲基苯丙胺和氯胺酮的人均消费水平相对于疫情前下降不到50%.考虑到疫情期间严格的管控措施,这一下降幅度说明这两种精神类药物滥用极其顽固;而疫情后两种药物的消费量及在环境中的浓度又基本恢复到疫情前的水平,进一步证明了精神类药物滥用的顽固性. 相似文献
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将国内外基于投入产出模型的虚拟水研究进行系统概括,认为按研究层面可以归纳为区域之间的虚拟水贸易和产业间部门用水关联两方面,并指出:(1)目前基于投入产出分析技术的虚拟水研究基本建立在价值型投入产出模型的基础上,实际上将产业虚拟水替代了原本产品虚拟水的概念.(2)目前针对工业品、服务品的虚拟水量化研究不足,并未独立研究非农产品虚拟水量化时的差异性.最后文章提出产业生态学中近年来发展的混合生命周期评价方法(Hybrid life-cycle assessment,HLCA). 相似文献