PD：人口翻倍

“Population Doubling”（常缩写为PD）是英国医学及相关科研领域中常用的专业术语，用以快捷地书写和表达“人口翻倍”这一概念。PD主要描述细胞群体数量翻倍的过程，在细胞培养、生物老化研究及流行病学分析中应用广泛。

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。
Population doubling time t were 18,17 and 267 days respectively.
种群加倍时间（t）18、17和267天。
The biological analysis results showed : Population Doubling(PD) Time ( PDT ) of cells was approximately 24h;
生物学分析结果表明：细胞群体倍增时间（PDT）约为24小时；
Compared with NPC, proliferation capability of INPC was stronger, its proliferation index and proliferation rate were increased, population doubling time was shortened.
与原代NPC相比，INPC细胞增殖指数和增殖率升高，群体倍增时间缩短。
Otherwise, a Beijing yellow chicken embryo fibroblast cell line was successfully established using the primary explant technique and population doubling time of the cells was 39.7h.
另外，采用组织块直接培养法，对北京油鸡胚胎组织进行原代和继代培养，成功地建立了成纤维细胞系，该细胞系群体倍增时间为39.7h。

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