time of origin

Objective To observe the time of origin and development in the mouse collecting duct.

目的观察小鼠肾脏集合管形态学发生发育的时间及规律。

They used this and other HIV-1 genetic sequences to construct a family tree of the origin of the viral strain and to estimate the time of origin of HIV-1 group M.

他们利用这个遗传序列与其他HIV-1的遗传序列构建出起源病毒株的家系图，并以此估算出HIV-1M组的起源时间。

Fossil Records and Molecular Clock Study of the Time of Origin of the Precambrian Biologic Lineages

前寒武纪生物起源时间的化石和分子钟研究

There have long been disputes about the time of origin of microbes that were quite prosperous in the Precambrian and the divergence time of metazoans.

对前寒武纪相当繁荣的微生物的起源时间和后生动物各门类的分支演化时间的研究，一直存在着很大的争议。

In the first chapter the author looks back the antilogy origin and evolution of the theory of human capital, and systematically introduce the theory of human capital so far with the time clue.

第一章回顾了人力资本理论的思想渊源与发展，以时间为线索对迄今为止人力资本方面的思想和理论进行了系统的介绍。

The traditional fossils records and the new-emerging molecular clock study are two methods by which the time of origin of biologic lineages and divergence in the Precambrian can be estimated.

传统的化石记录和新兴的分子钟研究，是可以提供生物谱系起源和分支时间的两种手段。

The origin of the room is virtually an open question at this time.

实际上，到现在为止，月球的起源还是个未解之谜。

The hypophyses of postnatal male Wistar rats, first day, 1, 2, 3 weeks, 1 and 3 months after birth, were studied by immunohistochemical staining to ascertain the time of origin, development and differentiation of the growth hormone ( GH) cells.

用免疫组织化学方法对出生后1天，1、2、3周，1及3月的Wistar种大白鼠脑垂体远侧部的促生长激素（GH）细胞的发育分化进行了观察。

Origin of humankind is a big difficult problem of science at the present time.

人类起源是当代的一大科学难题。

The time of origin of college students' injury has obvious seasonal nature, highest in autumn, lowest in summer, among which October is the highest while February is the lowest.

大学生伤害的发生时间有明显的季节性，秋季最高，夏季最低，其中10月份最高，2月份最低。

The push-pull theory may explain the origin of thousands of Vietnamese refugees and the boat people haunting Hong Kong for so long a time.

越南难民和船民问题长期困扰香港之原因，可运用推拉理论做一解释。

This estimated time of origin is decades earlier than the previous estimate of1930.

此次估计的起源时间比原以为的1930年要早数十年。

So the analysis of the most archaic extant domestic dog breeds in the world at present will be an effective method to reveal the region and time of domestic dog origin.

那么对目前世界上现存的古老犬种进行分析将是揭示家犬发源地和起源时间的有效方法。

The generic distributions in both modern and fossil times were outlined, and their distribution center, place and time of origin and the way of dispersal were discussed.

对各属的现代分布和地史分布作了描述，在此基础上，讨论了桦木科植物的分布中心、起源地、起源的时间和散布的途径。

This paper deals with the systematic relationships among living crocodiles and the time and place of origin of the Chinese alligator ( Alligator sinensis).

介绍了现存鳄彼此间的亲缘关系、扬子鳄起源的时间和地点。