| 释义 |
1 ?但当群体倍增值 虽然在早期培养时再生障碍性贫血患儿的骨髓MSC具有与正常儿童相似的扩增速度,但当群体倍增值（population doubling,PD）达20之后基本不再有增殖能力了,而正常儿童和胎儿来源的MSC却可稳定扩增到30 PD. 2 ?群体倍增值 虽然在早期培养时再生障碍性贫血患儿的骨髓MSC具有与正常儿童相似的扩增速度,但当群体倍增值（population doubling,PD）达20之后基本不再有增殖能力了,而正常儿童和胎儿来源的MSC却可稳定扩增到30 PD. 3 ?群体倍增数 ...基因编码的大T抗原才能导致细胞的永生化，大T抗原在人成纤维细胞感染表达后，寿命延长达20～30群体倍增数（population doublings，PD），永生化率为3×10-7。
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We measured the amount of DNA on pairs of daughter cells at different population doubling levels of human fibroblasts. 我们在不同人种的人成纤维细胞的倍增水平中测定成对子细胞的DNA含量。 - 2
Experts say all the surviving animals and their descendants are now wild, and to avoid the population doubling every year the animals are subject to a carefully managed cull. 专家说所有幸存的动物以及它们繁殖的后代都是野生的，为了避免它们的数量每年双倍的增加，这些动物都会被细致的管理控制宰杀。 - 3
Results During long term cultivation, the population doubling time of the cells became shorter and the percentage of aneuploidy chromosomes and colonies grown in soft AGAR increased. 结果卵圆细胞在培养过程中倍增时间逐渐缩短，非整倍体染色体数目增加，在软琼脂中生长的克隆增多。
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