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Short- and long-terms stimulatory impacts of calcium oxide nanoparticles (CaONPs) on the growth, photosynthesis and antioxidant enzymes of Chlorella sp.

Research on the impact of calcium oxide nanoparticles (CaO NPs) is very little in the literature. In this work, responses of growth, photosynthesis, and antioxidant enzymes activities in Chlorella sp to short term treatment (5 hours) and to long-term treatment (5 days) by CaO NPs (0, 20, 40, 60, 80 and 100 ppm) were investigated. The results revealed that, the highest Chlorella sp growth and Chlorophyll content were recorded at 100 ppm CaO NPs. The highest photosynthetic oxygen evolution (P N ) was recorded