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Antioxidant activity ABTS (2,2′ -Azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) test (A) and total polyphenolic content (B) in barley young plants depending on the dose of ozone (n = 20): differences between the results for the dose of ozone treatment are marked with capital letters; significance level is defined as p < 0.05.
