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排序方式: 共有157条查询结果,搜索用时 15 毫秒
151.
Senavirathna Mudalige Don Hiranya Jayasanka Zhaozhi Liu Fujino Takeshi 《Environmental science and pollution research international》2022,29(23):34475-34485
Environmental Science and Pollution Research - Microplastics are one of the most widely discussed environmental issues worldwide. Several studies have shown the effect of microplastic exposure on... 相似文献
152.
Katsunori Anezaki Takeshi Nakano 《Environmental science and pollution research international》2014,21(2):998-1009
The concentration levels and congener profiles of polychlorinated biphenyls (PCBs), pentachlorobenzene (PeCBz), and hexachlorobenzene (HxCBz) were assessed in commercially available organic pigments. Among the azo-type pigments tested, PCB-11, which is synthesized from 3,3′-dichlorobendizine, and PCB-52, which is synthesized from 2,2′,5,5′-tetrachlorobendizine, were the major congeners detected. It is speculated that these were byproducts of chlorobendizine, which has a very similar structure. The total PCB concentrations in this type of pigment ranged from 0.0070 to 740 mg/kg. Among the phthalocyanine-type pigments, highly chlorinated PCBs, mainly composed of PCB-209, PeCBz, and HxCBz were detected. Their concentration levels ranged from 0.011 to 2.5 mg/kg, 0.0035 to 8.4 mg/kg, and 0.027 to 75 mg/kg, respectively. It is suggested that PeCBz and HxCBz were formed as byproducts and converted into PCBs at the time of synthesizing the phthalocyanine green. For the polycyclic-type pigments that were assessed, a distinctive PCB congener profile was detected that suggested an impact of their raw materials and the organic solvent used in the pigment synthesis. PCB pollution from PCB-11, PCB-52, and PCB-209 pigments is of particular concern; therefore, the monthly variations in atmospheric concentrations of these pollutants were measured in an urban area (Sapporo city) and an industrial area (Muroran city). The study detected a certain level of PCB-11, which is not included in PCB technical mixtures, and revealed continuing PCB pollution originating from pigments in the ambient air. 相似文献
153.
Satoshi SUZUKI Norikazu MATSUMURA Takeshi OHOKA Shun SAKUMA Tomohiro NAKAHATA Masahide ISHIKAWA 《环境科学学报(英文版)》2009
Enzymes fixed on the electrode of biosensor are gradually inactivated and the electrode is discarded after using several times. In order to prepare the stable biosensor, we try to use a stable enzyme from extreme thermophilic bacteria, Thermus thermophilus HB8. It is very important that a stable enzyme from T. thermophilus HB8 is overproduced in Escherichia coli, for the purpose of enough supply of enzyme. Thereby, we determined the important sequence for overexpression of NADH oxidase (nox) gene from T. thermophilus HB8 in E. coli. As a result, it is revealed that ten nucleotides sequence, GAAATTAACT, in the upstream of start codon of nox gene was important for its overexpression in E. coli. 相似文献
154.
Assessment of plastic waste generation and its potential recycling of household solid waste in Can Tho City, Vietnam 总被引:1,自引:0,他引:1
Nguyen Phuc Thanh Yasuhiro Matsui Takeshi Fujiwara 《Environmental monitoring and assessment》2011,175(1-4):23-35
Plastic solid waste has become a serious problem when considering the disposal alternatives following the sequential hierarchy of sound solid waste management. This study was undertaken to assess the quantity and composition of household solid waste, especially plastic waste to identify opportunities for waste recycling. A 1-month survey of 130 households was carried out in Can Tho City, the capital city of the Mekong Delta region in southern Vietnam. Household solid waste was collected from each household and classified into ten physical categories; especially plastic waste was sorted into 22 subcategories. The average household solid waste generation rate was 281.27 g/cap/day. The compostable and recyclable shares respectively accounted for high percentage as 80.74% and 11%. Regarding plastic waste, the average plastic waste generation rate was 17.24 g/cap/day; plastic packaging and plastic containers dominated with the high percentage, 95.64% of plastic waste. Plastic shopping bags were especially identified as the major component, accounting for 45.72% of total plastic waste. Relevant factors such as household income and household size were found to have an existing correlation to plastic waste generation in detailed composition. The household habits and behaviors of plastic waste discharge and the aspects of environmental impacts and resource consumption for plastic waste disposal alternatives were also evaluated. 相似文献
155.
Sarmah Purbashree Ishiguro Takeshi Maruyama Kenji Xue Tianle Yamawaki Atsushi Katsumi Takeshi Takai Atsushi Omine Kiyoshi Doi Yoichi 《Journal of Material Cycles and Waste Management》2022,24(6):2183-2200
Journal of Material Cycles and Waste Management - Mechanical properties and slope stability of inert waste landfills under seismic condition were studied with three different approaches: in-situ... 相似文献
156.
Zaw Aye Cho Cho Gathuka Lincoln W. Takai Atsushi Katsumi Takeshi 《Journal of Material Cycles and Waste Management》2022,24(4):1423-1431
Journal of Material Cycles and Waste Management - Dredged soils are typically mixed with additives to improve their mechanical properties and reduce the risks of leaching toxic elements. An... 相似文献