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Toxic Effect of CuO Nanoparticles and Their Distribution in Carp (Cyprinus Carpio)

Author: ZhangKai
Tutor: WangZhenYu
School: Ocean University of China
Course: Environmental Science
Keywords: Carp CuO nanoparticles Distributed Nervous system
CLC: X503.225
Type: Master's thesis
Year: 2010
Downloads: 80
Quote: 0
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Abstract


In recent years, with the extensive application of nano-materials, nano-particles caused by the negative effects on the environment and bio-wide attention. At present, the environmental benefits of nanoparticles has become a hot spot of international research. Nano-particles can find their way into aquatic ecosystems, can produce toxic effects on aquatic organisms such as microbes, algae, crustaceans and fish, which may destroy the original material composition and structure of aquatic ecosystems, the aquatic ecosystem function potential negative impact. Nanoparticles in water can enter the fish's body and accumulate in fish tissue, and toxic effects on fish. However, the nanoparticles in the fish Absorption, distribution, accumulation and its effect on fish toxic mechanism is unclear. The purpose of this study is to determine the minimum lethal concentration of CuO nanoparticles carp, CuO nanoparticles carp sub-chronic toxicity study at this concentration, to determine the CuO nanoparticles in the amount of the main carp in vivo accumulation organs and with the feces, and preliminary CuO nanoparticles on the mechanism of action of the carp nervous system, for in-depth understanding of CuO nanoparticles into the water potential biological toxicity and toxicity of mechanisms to provide basic data. Firstly, research CuO nanoparticles (10 nm) carp 96 h acute toxicity. The results show that the CuO nanoparticles carp behavior can lead to abnormalities such as increased mucus secretion, abnormal buoyancy control and decreased activity. CuO nanoparticles on the toxic effects of the carp is not obvious, and its toxicity increased with increasing concentrations of greater than micron particles, and its toxicity. Further experiments will be suspension of 100 mg l-1 of CuO nano identified as the exposure concentration of CuO nanoparticles carp sub-chronic toxicity. Carp sub-chronic toxicity studies have shown that the CuO nanoparticles can inhibit the growth of carp, and the degree of inhibition of the CuO nanoparticles stronger than CuO micron particles and Cu2 solution. After exposure to, CuO nanoparticles groups carp tissue Cu content higher than micron particles and Cu2 solution. CuO nanoparticles after exposure to the organizations Cu content size order: intestinal gt; gill gt; other Organization gt; liver gt; skin and scales gt; muscle gt; brain, the CuO nanoparticles mainly distributed in the carp intestine, gills and other organizations in. In addition, carp exposed to CuO nanoparticles, a fecal Cu content increases as the exposure time increases, and Cu The CuO nanoparticles Groups carp feces was significantly higher than CuO micron particles and Cu2 solution group. CuO nanoparticles may penetrate the blood-brain barrier and enter the carp brain, and to continue to accumulate in brain tissue. The preliminary results of this study show that the CuO nanoparticles after exposure can lead to reduced cholinesterase activity in the carp brain tissue, which may affect the normal function of the nervous system, thereby causing the carp after exposure to abnormal behavior.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > General issues > The hazards of environmental pollution > Biological hazards > Animal > Fish,aquatic
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