巰基乙酸肉湯[註 1]是一種多用途、營養豐富的鑑別培養基。其主要作用是測試微生物對氧含量需求的高低。巰基乙酸鈉在培養基中消耗氧氣,從而使專性厭氧微生物得以生長[2]。因為巰基乙酸酯鈉與從上部往下擴散的氧氣結合,所以氧氣濃度隨深度的增加而降低。
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