静止期 stationary phase
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在细胞培养中,培养液中的细胞密度随着培养的进行,超过一定限度的高值,增殖速度下降,不久细胞数的增加便停止下来,此时期称为静止期;如果继续培养下去,则进入衰亡期,活细胞数目减少(参见细菌生长期)。进入静止期的原因,是由于营养不足和细胞产生的有害物质的积累,以及氧的供给速度下降等因素造成的。一般随着静止期的接近,培养群的细胞龄的分布出现偏向,细胞周期的G1期细胞比率多有增高。
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