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This paper conducted on the effect of nanoparticles on the growth of green alga  Coelastrella terrestris  which was firstly used to find out the effect of nanoparticles on its growth. Four concentrations of copper were used, represented by a proper concentration of CuSO4 that exists in the Chu-10 medium 0.08 mg/l, as control treatment and the rest was CuO nanoparticles represented by (0.04, 0.08 and 0.16) mg/l. Results of exposure of the  Coelastrella terrestris  to the copper nanoparticles showed a decrease in the growth rate, chlorophyll a,b and carotenoids in comparison to the control treatment which gave the best results of the characteristics. Results were confirmed by the results of the statistical analysis at P&lt;0.05. Although the Copper plays a vital role in fundamental physiological processes. However, CuO in nanoparticles form becomes toxic, causing growth inhibition of alga due to adverse impacts on the same cellular processes.

Influence of Different Concentrations of Nano-Copper Oxide on the Growth of Coelastrella terrestris