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Effect of oleic acid and Cu2+ on the amounts of mycelia and triterpenoids. Control, sterile water; CuSO4, 100 μmol/L; Cu2+50, Cu2+100, Cu2+150, 50, 100 and 150 μmol/L, supplemented on the 3rd day; Oleic acid, 3% (v/v); OA2, OA3, OA4, the addition of oleic acid was 3% (v/v), 4% (v/v) and 5% (v/v), oleic acid was added to different culture media on day 0; +, compound.
