1817年，在第一次移民大潮中，一位英国游客观察到：“古老的美洲似乎正在分裂并向西移动。”
"Old America seemed to be breaking up and moving westward," observed an English visitor in 1817, during the first great wave of migration.
美国俄克拉荷马州医学研究基金会的科学家们第一次成功地将细胞分裂的过程加以逆转，这一医学技术上的突破可能会最终使人类获得治愈癌症及其它多种疾病的有效办法。
Now scientists have for the first time reversed the process of cell division, a breakthrough that could eventually lead to treatments for cancer and other disorders.
结果表明海狸鼠卵母细胞与其它啮齿动物的卵母细胞一样，能够在体外培养成熟，完成第一次减数分裂，排出第一极体。
The results indicated that nutria oocytes, like other rodent oocytes, can be matured in vitro, complete first meiotic division and discharge first polar body.
精神分裂症组与非精神分裂症组第一次评分比较显示：精神分裂症组个人整洁、总分、总积极分低于非精神分裂症组（P＜0．05）；
The individual tidiness, total scores and total positive scores of schizophrenia patients were lower than those of non-schizophrenia patients on the first evaluation(P<0.05).
探讨褐斑大蠊减数分裂规律，运用空气干燥法对褐斑大蠊精原细胞第一次减数分裂染色体形态进行观察。
In order to study the general law on meiosis of Periplaneta Brunnea. Air-dried method was used to observe the chromosome of spermatogonium in different stages.
尽管如此，这仍是我们第一次从跨越多个人群的大容量样本中鉴别出于精神分裂症有关的基因缺失，stefansson补充道。
Nevertheless, these are the first deletions associated with schizophrenia to be identified in such a large sample and across several populations, stefansson adds.
尽管如此，这仍是我们第一次从跨越多个人群的大容量样本中鉴别出于精神分裂症有关的基因缺失，stefansson补充道。
Nevertheless, these are the first deletions associated with schizophrenia to be identified in such a large sample and across several populations, stefansson adds.
应用推荐