无胚的

RESULTS: CaB was not detected during early odontogenesis from the dental lamina to the late c ap stage .Small amount of the protein first appeared in ameloblast and some of dif ferenting cells in the surface of dental papilla in early bell stage. As to late bell stage, the cytoplasm of ameloblasts and odontoblasts with secreted dentin was all stained strongly, as well as some of n uclei.

结果：人牙胚蕾、帽状期成釉器无CaB的表达；钟状早期成釉器的内釉细胞及部分牙乳头表面处于分化状态的细胞弱阳性染色；钟状晚期成釉器的成釉细胞、成牙本质细胞及部分胞核呈现强阳性染色。

The present paper presents the chain recurrent set with the expansive homeomorphism and shadowing properties and this connection for the mistake in literature [1] and its proof.

给出具有跟踪性可扩同胚的链回归集的几个性质，指出以往文献中证明链回归集无环性时的错误之处，并给出严格的证明。

In seeds of Bupleurum chinese, some problems exist such as low germination rate and high inembryonate rate. To investigate the reasons for these problems, the phases of inflorescence differentiation and the variation of differentiation processes between inflorescences at different positions were studied.

为了了解造成北柴胡种子发芽率低、无胚率高等种子质量问题的原因，本文对北柴胡花序分化进程的各个时期以及不同位置花序分化进程的差异进行了研究。

Results Only unstable random mutations happened in 29 sites with nonsynonymous vs synonymous mutation ratio of 1.42 during 50 passages in 2 serials without maternal antibodies.

LG1株H9N2在没有抗体的鸡胚的传代过程中，仅发生少数碱基的不稳定随机变异，且多为无义突变。

However, multiple stable nonsynonymous mutations were detected gradually during 50 passages of 4 serials in embryos with maternal antibody to LG1 strain, and the NS/S ratio was as high as 3.46 among 45 mutated sites.

在2 个传代系列的10 个代次病毒，共出现了29 个位点变异，有义突变与无义突变比值NS/S为1.42 。但在有抗体的鸡胚的传代过程中，发生了多个呈现稳定遗传的有义突变。

Seed 1; cotyledons unequal, 1 large, starchy, retained in fruit, 1 small, scalelike, germinating from fruit apex, through pore of stylar canal; endosperm absent.

种子1；子叶不均匀的，1个大，粉状的，保留在果里面，一个小，鳞片状从果实顶部发芽，横穿花柱道孔；无胚乳。

Hypocotyls and stems from sterile seedling were cut into pieces (0.5-0.8cm) and cultured in vitro. The result showed that the frequency of bud induction of caulicles was higher than that of hypocotyls.

无菌苗的下胚轴和茎切成0.5-0.8cm的小段，接入添加不同激素组合的MS（或1／2MS）基本培养基中进行芽的诱导。

We used the medaka as a fish model for the development of ES cell technology. We have established feeder cell free culture conditions and obtained several ES cell lines from midblastula embryos.

我们以青鱂作为建立鱼类ES细胞技术的模式，通过建立并应用无滋养层细胞的培养条件，获得了来自中期囊胚的ES细胞系。

Another year's instalment of flowers, leaves, nightingales, thrushes, finches, and such ephemeral creatures, took up their positions where only a year ago others had stood in their place when these were nothing more than germs and inorganic particles.

在新的一年里，鲜花、树叶、夜莺、画眉、金翅雀，以及诸如此类的生命短暂的生物，都出现在它们各自的岗位上了，仅仅在一年以前，这些位置都被其它的生物占据着，而它们不过只是一些胚芽和无机体的分子。

Compared with the traditional method, this new method has some advantages:①centrifugation is not necessary, therefore, separation of high molecular weigh DNA is possible;②phenol, chloroform and other toxic organics are not needed;③separation is more efficient and less timeconsuming④the quality of DNA isolated in this way is very high.

当样品裂解液与杂交液1：1混合并用磁性微粒进行小麦黄化苗和种胚的DNA分离与纯化时，效果非常理想。与传统的纯化方法相比，该法具有①快速、简便；②无有机试剂污染；③无需离心分离；④得率和纯度均较高等优点。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。