劃線法(Streaking)是一種細菌的分離或接種方式。這種方法的學名「Streaking」的原意是指裸奔,用來形容當細菌以這種方法在平板上分離後,細菌會像某些大學的迎新活動那樣「圍着校園裸奔」。 當劃線法用於細菌分離或稀釋時,會稱為劃線平板分離法或平板劃線分離法[1];而當用於接種之時,稱為劃線平板接種法[1]。利用劃線法,可以簡便的把已稀釋的細菌純化[2]。
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