排序方式: 共有27条查询结果,搜索用时 812 毫秒
21.
Farag Malhat Hany Badawy Dalia Barakat Ayman Saber 《Journal of environmental science and health. Part. B》2013,48(5):331-335
A method for determination of etoxazole residues in apples, strawberries and green beans was developed and validated. The analyte was extracted with acetonitrile from foodstuff and a charcoal-celite cartridge was used for clean-up of raw extracts. Reversed phase high performance liquid chromatography with photodiode array detector (HPLC-DAD) was used for the determination and quantification of etoxazole residues in the studied samples. The calibration graphs of etoxazole in a solvent or three blank matrixes were linear within the tested intervals 0.01–2 mg L?1, with correlation coefficient of determination >0.999. The combined solid phase extraction (SPE) clean-up and the chromatographic method steps were sensitive and reliable for simultaneous determination of etoxazole residues in the studied samples. The average recoveries of etoxazole in the tested foodstuffs were between 93.4 to 102% at spiking levels of 0.01, 0.10, and 0.50 mg kg?1, with relative standard deviations ranging from 2.8 to 4.7%, in agreement with directives for method validation in residue analyses. The limit of detection (LOD) of the HPLC-DAD system was 100 pg. The limit of quantification of the entire method was 0.01 mg kg?1. 相似文献
22.
Silver and titanium dioxide nanoparticles are known to induce oxidative stress in vitro and in vivo. Here we test if they impact development, mating success, and survivorship in Drosophila melanogaster, and if so, if these effects are reversible by antioxidants. Ingestion of nanotitanium dioxide during the larval stage of the life cycle showed no effects on development or survivorship, up to doses of 200 μg mL−1. Conversely, ingestion of nanosilver had major dose, size, and coating-dependent effects on each of these aspects of life history. Each of these effects was partially or fully reversible by vitamin C. Larvae growing on nanosilver supplemented with vitamin C showed a greater than twofold increase in survivorship compared to flies reared on nanosilver alone, and a threefold increase in mating success. Vitamin C also rescued cuticular and pigmentation defects in nanosilver fed flies. Biochemical assays of superoxide dismutase and glutathione show these markers respond to nanotitanium dioxide and nanosilver induced oxidative stress, and this response is reduced by vitamin C. These results indicate that life history effects of nanosilver ingestion result from oxidative stress, and suggest antioxidants as a potential remediation for nanosilver toxicity. Conversely, the lack of nanotitanium dioxide life history toxicity shows that oxidative stress does not necessarily result in whole organism effects, and argues that nanoparticle toxicity needs to be examined at different levels of biological organization. 相似文献
23.
Entezari Saber Al Mamun Abdullah Mostashari Amir Ganjidoust Hossein Ayati Bita Yang Jun 《Environmental science and pollution research international》2022,29(59):88410-88431
Environmental Science and Pollution Research - Microplastic (MP) pollution is one of the emerging threats to the water and terrestrial environment, forcing a new environmental challenge due to the... 相似文献
24.
Environment, Development and Sustainability - A hybrid ventilation system combining both natural and mechanical ventilation has proven very promising in moderating indoor climate, based on its... 相似文献
25.
Marandi Mahdieh Shirdel Pirsa Sajjad Amiri Saber Fazeli Manouchehr 《Journal of Polymers and the Environment》2022,30(10):4114-4129
Journal of Polymers and the Environment - The objectives of the present study were to prepare an active biodegradable film based on zein-containing copper oxide nanoparticles (CuO NPs) and Mentha... 相似文献
26.
Ghasemizad Saba Pirsa Sajad Amiri Saber Abdosatari Parisa 《Journal of Polymers and the Environment》2022,30(6):2493-2506
Journal of Polymers and the Environment - In this paper, the effect of adding gum arabic at levels of 0–5%, and chromium oxide nanoparticles (Cr2O3 NPs) at levels of 0–3%, were... 相似文献
27.
Elgarahy Ahmed M. Eloffy M. G. Hammad Ahmed Saber Ayman N. El-Sherif Dina M. Mohsen Ahmed Abouzid Mohamed Elwakeel Khalid Z. 《Environmental Chemistry Letters》2022,20(6):3453-3504
Environmental Chemistry Letters - In the context of climate change, most of the actual dihydrogen production is not sustainable with about 96% of the 60 million tons of dihydrogen produced annually... 相似文献