胚胎

This paper also discusses the mechanism of occurrence of these aberrant embryos and discusses their relationship to diploid–tetraploid mosaicism.

文章也讨论了这种异常胚胎的发生机制，以及它与二倍体－四倍体嵌合体的关系。

Objective Constructing the eukaryotic expression vector of mouse LIF and conducing to improve the directional differentiation research of ES cell about other laboratory animals.

目的 构建小鼠白血病抑制因子的真核表达载体，有助于开展高其他实验动物的胚胎干细胞的定向分化研究。

Objective To establish the spontaneous differentiation culture system of embryonic stem cells in vitro and provide methodological and morphological basis for the directional differentiation of ES cells.

目的建立胚胎干细胞(embryonicstemcells，EScells)体外非定向分化培养系统，为其向各种成熟细胞的定向诱导分化提供方法学和形态学基础。

Trehalose is a stable and unharmful disaccharide, which has been widely used in the field of the cryopreseved red cells, platelet and organs.

海藻糖是一种稳定的无毒副作用的非还原性双糖，已被广泛应用于红细胞、血小板和胚胎等的冷冻保存中。

The over-all conclusion that must be drawn from the disarrangement experiments are first, that motor coordination (and certain behavior patterns dependent upon it) is driven by a rigid, unalterable cycle of neurophysiological events inherent in a species' central nervous system; second, that larval, fetal, or embryonic tissues lack specialization; this enables these tissues to influence one another in such a way as to continue to play their originally assigned role despite certain arbitrary peripheral rearrangements.

全面性的结论，即必须先从未安排的实验描绘，动作协调（取决於它的某些行为模式）是僵硬的，像是不可改变的周期神经生理活动中，其中所固有物种的中枢神经系统；第二，那幼虫，胎儿或胚胎组织缺乏专业化，这使这些组织影响专业化的另一种方式，尽管某些周边重新排列，还是继续发挥其原来分配的作用。

The snail was found to have an indirect developmental type in the early development. The fertilized eggs were oval-shaped and discoidal cleavage. Embryonic development stages were divided into cleavage, blastula, gastrulae, trochophore, and intra-membrane veliger. Larval development stages included veliger, late veliger and crawling larvae metamorphosed to juvenile.

结果表明：黄口荔枝螺卵囊高度平均为7.33 mm，卵粒数量平均为165粒；黄口荔枝螺的早期发育属间接发生型，受精卵呈椭圆形，卵裂为盘状卵裂；在卵囊内，胚胎发育包括卵裂期、囊胚期、原肠胚、膜内担轮幼虫、膜内面盘幼虫；幼虫发育包括面盘幼虫、后期面盘幼虫和匍匐幼虫。

The HCG of blood quantitative testing is better than the testing in HCG of urine only the same with the alive or the embryonic organization; the people of discoverture, birth control for the woman, ring wearing, unusual gravidity and menopause lately are the keystone colony; the efficient method to reducing the wrong diagnoses is serious inquiring about the state of illness and the timely assistant testing.

血HCG定量检测优于尿HCG的定性检测，但仅适用于活的或近期破裂胚胎组织；未婚、女扎、放环、有异位妊娠史者及近期绝经者仍是异位妊娠不可忽视的发病群体；认真的询问病史，及时行有效的辅助检查是降低误诊的有效方法。

Every explant was pricked with a dissector at the center of one subregion before inoculated on MS+BA 1mg/L+NAA 4mg/L+2,4D 05mg/L medium and incubated in darkness for 7 days,then transfered to MS+BA 1mg/L medium.85% of the explants regenerated somatic embryos directly around the prick after 40 days.

每一叶片在1个亚区中心部位用解剖针刺伤1点后接种于MS＋BA1mg／L＋NAA4mg／L＋2，4D05mg／L＋蔗糖20g／L的培养基上，暗培养7d后，转接到MS＋BA1mg／L＋蔗糖20g／L的培养基上继续暗培养，40d后，85％的叶片在刺伤口周围发生直接类型体细胞胚胎。

The process is distressingly hit-or-miss, though, and the odds of a successful pregnancy go up with the number of embryos used.

但这个过程不管成功与否都很令人痛苦，成功的几率取决于植入的胚胎个数。

Meanwhile, it pointed out that the main problem in the domain is about the definition of conception and category of traditional Chinese medicine with embryo toxicity and the foundation of relative assessment system.

同时，指出目前该研究领域存在的问题主要在于对胚胎毒性中药概念范畴的确定及其相关评价体系的建立等方面，认为解决的方法可以从严格控制有毒中药、正确炮制和合理配伍以及引申应用等多方面入手。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。