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。

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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。

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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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Now, in any society changing this much, this fast, doubling its own population--doubling--in twenty-five years.

现在,在任何变化如此巨大的社会,如此迅速地,在二十五年内,人口增至两倍

耶鲁公开课 - 美国内战与重建课程节选

So more than doubling the risk can certainly site to the population Now these kind of results show how important it is to do studies that don't group everybody in the population together.

由图可见,发病率差异量超过一倍,这些研究结果表明,在研究过程中分组的重要性

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The NIH said the scientists who developed these stem cells lines have told the agency that the stem cells are viable and can be frozen and cultured and have been through more than one population doubling.

CNN: NIH announces owners of stem cells

All in all, the increase in the parrotfish population led to a doubling of grazing on the reef, as well as to an increase in the number of groupers.

ECONOMIST: Fishing (I)

After all, 1070 enjoys support throughout the United States, including in states where Hispanics do not make up nearly a third of residents and 41% of schoolchildren, where the population has not come close to doubling since 1990, and which have not just seen a high-octane property boom end in such a devastating bust.

ECONOMIST: Lexington