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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Caspian Journal of Environmental Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Liver enzymes,silver nanoparticles,LC50,Pangasianodon hypophthalmus,Thyroid Hormones
- چکیده:
- چکیده انگلیسی: Nanotechnology is the exploitation of physical, chemical, and biological characteristics of the particles with less than 100 nanometers in size. The most of the produced nanoparticles (56%) are composed of silver. The high consumption of these materials in industry and household products has led to their frequent release in aquatic ecosystems. The median lethal concentration (LC50) and the impact of silver nanoparticles on liver enzymes (ALP, LDH, AST, ALT) and thyroid hormones (T4 and T3) in Pangasius hypophthalamus wereinvestigated in the present study in three steps: At first, OECD (The Organization for Economic Cooperation and Development) protocols were used to determine the fatal levels of the silver nanoparticles (Ag NPs) in striped catfish. Second, semi-lethal concentration was found as 37.32 µg L-1 via regression test. In the last step, 168 fish received 0, 3.37, 7.46, 18.66 µg l-1 Ag NPs with three replicate. Six fish were randomly selected after 14 days from each replicate. Whole fish body extraction was used to measure the liver enzymes and thyroid hormones. The results suggested that due to the lower LC50 of Ag NPs in striped catfish, this species is more susceptible compared to various other fish species. Exposure to the silver nanoparticles with different concentrations significantly increased the levels of liver enzymes (ALP, LDH, AST, ALT) and also significantly decreased the T3, but no effect on T4.
- انتشار مقاله: 12-04-1399
- نویسندگان: Saleh Ghazanfari,Ruhollah Rahimi,Rasool Zamani-Ahmadmahmoodi,Ali Momeninejad,Amirreza Abed-Elmdoust
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Karkheh river,Water Quality,Cluster analysis,Principal components analysis
- چکیده:
- چکیده انگلیسی: Rapid population growth as well as agricultural and industrial development have increased the contamination of Iranian rivers. This study utilized principal components analysis (PCA) to determine the degree of significance of qualitative parameters of water resources in the Karkheh River in southwestern Iran. Cluster analysis (CA) grouped the monitoring stations based on the water quality data under measurement. The first three components obtained from the PCA accounted for 39.68, 35.04, and 17.76% of the total variance, respectively; these three components explained a total of 92.49% of the variance of the data sets. The PCA factors indicated that the parameters influencing changes in water quality were generally related to weathering and land washing in response to floods, organic contamination from household wastewater, waste from sand washing, and runoff from chemical fertilizers. Moreover, the PCA results indicated that the relative quality of the river water in the downstream areas, when compared with upstream areas, was worse due to the greater concentration of contamination sources in the vicinity of the monitoring stations. Given Iran’s water crisis, the preservation and reclamation of this valuable resource require greater attention from the relevant authorities
- انتشار مقاله: 27-07-1396
- نویسندگان: Mehrnaz Asefi,Rasool Zamani-Ahmadmahmoodi
- مشاهده