巯基乙酸肉汤[注 1]是一种多用途、营养丰富的鉴别培养基。其主要作用是测试微生物对氧含量需求的高低。巯基乙酸钠在培养基中消耗氧气,从而使专性厌氧微生物得以生长[2]。因为巯基乙酸酯钠与从上部往下扩散的氧气结合,所以氧气浓度随深度的增加而降低。
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参考
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