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The perturbation analysis is used to study the conditions that give rise to superharmonic resonance and subharmonic resonance.

本文将考虑空间效应非对称刚度的单层结构简化为三个自由度体系，用多尺度法研究了体系在强激励下的超谐共振与亚谐共振时的动力行为，通过算例分析得到一些不同于线性结构的结论，为结构非线性抗震分析提供了途径。

On germination, the zygospore undergoes meiosis to produce haploid cells that give rise to a new thallus.

在萌发期，接合孢子经历减数分裂形成单倍体细胞再产生新的植物体。

Irrationality of product design often results in occurrence of all kinds of problems, which is harmful to people's health; or at worst, the better may feel some uncomforted in his body while the worse would give rise to some physical or mental illness.

产品设计的不合理常常导致种种问题的出现，最严重的时候可以危害到人们的身体健康，轻者感觉身体不舒服，重者引起生理或心理方面的疾病。

And then adding NAA at low concentration in MS was used to give rise to roots. We also found that lower level of hormone could control effectively browninng and vitrifaction during the culture and G1 n (6mg/L) and AgNOj (2mg/L) supplemented in shoot induction media could improve the shoot information rates apparently (about90%).The whole period of plant regeneration from leaflets of peanut could be divided as five steps: germination - shoot induction -shoot elongation-rooting- tranplant.

用1／2MS培养基萌发花生种子，9-10d后，从无菌花生苗上切取幼嫩叶片中部为外植体。2500Lux光照和27±1℃条件下，在诱芽培养基(MS+BA3mg／L+NAA0.8mg／L+AgNO_32mg／L十Gln 6mg／L)培养12-14d即可观察到明显芽点或瘤状突起，较前人报道的培养时间大大缩短了，4w后芽点进一步发育成丛生芽，芽诱导率达90.2％，每个外植体平均产9个丛尘芽，然后转至培养基MS+BA3 mg／L+AgNO_32 mg／L上诱导芽的伸长，3-4w后可长至3-4cm，切下带有2-3片叶片的幼芽移至生根培养基(MS+NAA0.8mg／L+AgNO_32mg／L)，1w后切口处可见白色不定根形成。

In the fourth week, URS divides cloaca into urogenital sinus anteriorly and primitive rectum posteriorly, which communicate with each other to give rise to the cloacal canal.

讨论 传统理论认为，在胚胎第4周，尿直肠隔将泄殖腔分为前后两部分，前者为尿生殖窦，后者为原始直肠。

Then cloacal membrane is divided into urogenital membrane and anal membrane, until the eighth week, anal membrane ruptures to give rise to anus.

随着胚胎发育，尿直肠隔不断下降与泄殖腔膜的距离越来越小，逐渐与泄殖腔膜融合，同时泄殖腔膜也被分为前后两部分，前者为尿生殖膜，后者为肛膜。第8周时，肛膜破裂，肛门形成。

The subunits composition of heteromeric channels might give rise to diverse resulting biophysical and regulatory properties relating to ion conductance. The studies on the TRP channel assembly mechanism and function of heteromeric channels are getting much concern.

不同亚基所形成的异源通道具有不同的生物物理学功能和药理学特性，因此TRP通道的组装机理和异源组装通道的功能研究成为该领域的热点而日益得到关注。

On the eastern state line with Virginia, high peaks in the Monongahela National Forest region give rise to an island of colder climate and ecosystems similar to those of northern New England and eastern Canada.

东国符合弗吉尼亚，高峰在莫农加希拉国家森林地区产生一个岛屿的寒冷的气候和生态系统类似于北部新英格兰和加拿大东部。

A few muscle stem cells exist in adult mammalian skeletal muscle. Muscle stem cells can be activated to initiate proliferation and give rise to spindly myoblasts, which undergo differentiation and cell fusion into multinucleated myotubes.

哺乳动物骨骼肌中存在着少量的肌肉干细胞，肌肉干细胞可激活、增殖形成单核的成肌细胞，并融合分化为多核肌管。

We suppose that there is a presently undefined subfraction of stem cell population that exists in a number of tissues beyond embryonic development. We term them postembryonic pluripotent stem cells. They differ from embryonic stem cells in that they gradually lose some differentiation potentials during development and adopt some special phenotypes once within a certain tissue. They can give rise to different kinds of stem cells; therefore, help to maintain balance during development and metabolism. They provide cells not only for the damaged tissues they reside, but also for damaged tissues different from them by migration triggered by proinflammatory cytokines or growth factors.

我们认为在胚胎发育后的多种组织中都存在一类原始干细胞群体，它们和造血干细胞、神经干细胞等多能干细胞不同，后者只能分化为特定胚层的细胞，而这类原始干细胞可分化为不同胚层的组织细胞；另一方面，它们区别于胚胎干细胞，在妊娠期间会逐渐失去部分分化潜能，并且会出现一些特殊表型或者分子标志，我们称其为胚胎后亚全能干细胞，这类干细胞具有下列特性：可分化为不同胚层的细胞，分布于身体的所有组织和器官，具有相同的表型或标志；他们在胚胎期存在于一些或全部的组织和器官中，可分化为不同类型的多能干细胞并在生长发育和新陈代谢中维持这些多能干细胞保持平衡；可以参与机体自我修复和更新，不仅能分化为所在器官的组织特异性细胞，参与器官重塑，也可以在炎症因子或者生长因子的趋化作用下，远处转移修复受损组织。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了