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Effect of ammonium nitrate (control, N 500 mg/L, N 1,000 mg/L, N 5,000 mg/L and N 10,000 mg/L) on antioxidant activity measured by DPPH• (A) and ABTS•+ (B) expressed in Trolox equivalents (mmol TE/100 g DW) of ‘Pok Dum’ Vitis vinifera cell suspension cultures. Data are mean ± SD (n = 3). Means at each day of culture with the same letter do not differ according to Duncan’s New Multiple Range Test, p ≤ 0.05.
