首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   7篇
  免费   0篇
污染及防治   6篇
社会与环境   1篇
  2012年   1篇
  2006年   1篇
  1991年   1篇
  1984年   1篇
  1982年   1篇
  1978年   2篇
排序方式: 共有7条查询结果,搜索用时 15 毫秒
1
1.
The metabolism of diisopropylnaphthalene (DIPN) in fish was studied from an ecotoxicological viewpoint to clarify the environmental fate of DIPN, a solvent of carbonless paper which is widely used as a substitute for PCB. This study identified the following metabolites in carp by in vivo experiment; 2-(1-hydroxy-1-methyl) ethyl-6-isopropylnaphthalene, 2-(1-methyl-2-hydroxyethyl)-6-isopropyl-naphthalene, 2,6-(1-hydroxy-1-methyl) ethyl-naphthalene, 2-(1-hydroxy-1-hydroxymethyl) ethyl-6-isopropylnaphthalene and α-[2-(6-isopropylnaphthyl)] propionic acid. Identification was based on UV, IR, MS, and NMR analyses. The metabolism of 2,6-DIPN in carp was concluded to mainly through oxidation of the isopropyl chain.  相似文献   
2.
Uegaki R  Seike N  Otani T 《Chemosphere》2006,65(9):1537-1543
Uptake of dioxins was confirmed in rice plants. We determined (i) dioxin concentrations and isomer profiles in leaf+stem samples of rice plants grown in three soils with different dioxin concentrations and isomer profiles and (ii) temporal changes in dioxin concentrations and isomer profiles in rice grown in a paddy field on which agricultural chemicals containing dioxin impurities had been used in previous years. Principal-component and chemical mass-balance analyses of the data showed that dioxin concentrations and isomer profiles in the rice grown in the different soils were similar, even though the dioxin concentrations and isomer profiles of the soils were different. However, the dioxin concentrations in the rice were influenced by dioxin levels in the atmospheric gas phase. Changes in dioxin levels during the growing period of the rice were also strongly influenced by adhesion of the soil to plant components during the early stage of growth, but gradually the influence of the atmospheric gas phase became predominant. Calculated dietary uptake estimates indicated that, even in rice grown in Japan on soil contaminated with high concentrations of dioxins, the amount of dioxins ingested by humans from rice is extremely small, and the amount of dioxins ingested by livestock from forage rice is similar to that for other forage crops.  相似文献   
3.
This study described an invitro experiment on biotransformation of 2,6-DIPN in carp hepatopancreas. It has already been revealed by the previous invivo studies to be metabolized with enzymatic oxidation in the liver and been postulated a metabolic pathway. These results were confirmed by means of incubation with 2,6-DIPN in carp hepatic microsome preparation with NADPH, and G-6-P as co-factor. It was suggested that DIPN may be mainly metabolized in the hepatic cytochrome P-450 in the microsomes system. The kinetic parameters i.e. apparent Michaelis constant (Km) and maximum velocity (Vmax), in the metabolites formation were also calculated.  相似文献   
4.
5.
A chemical determination method of singlet oxygen in the atmosphere was established. The method employs a specific reaction of α -terpinene with singlet oxygen to produce the single product, ascaridole. Amberlite XAD-2 coated with α -terpinene was packed into a glass tube shielded from light and sample air was passed through the tube. Ascaridole formed was extracted with hexane from Amberlite XAD-2 and was determined by gas chromatography. The amount of singlet oxygen was calculated from that of ascaridole. Ascaridole was not formed by oxidation of α -terpinene with ozone, hydrogen peroxide and hydroxyl radical, and ascaridole formed by singlet oxygen was stable against these oxidants. The method was applied to actual polluted air and diurnal variations in the singlet oxygen were observed.  相似文献   
6.
Modern society confronts multiple sustainability challenges, including population growth, resources limitations, and a deteriorating environment. As a response, sustainability science education plays a major role in developing human capacity to manage these issues. This paper proposes the concept of “sustainability science education across Mind–Skills–Knowledge” as well as the competencies to be acquired and its pedagogy. This paper evaluates the effectiveness of such an educational system and its method of implementation using the example of the Graduate Program on Sustainability Science (GPSS), which was started at Ibaraki University in 2009.  相似文献   
7.
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号