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Androstenedione and dehydroepiandrosterone as a new steroid material attracts people's attention because of the shortage of diosgenin resource and successful synthesis of AD by degradation of sterols. The followings were included in this thesis: 1. 24 new oxime-ether and oxime-ester compounds from AD were synthesized by cleavage of A-ring through NaIO_4/KMnO_4 oxidation, ring closure by amination, oximation with hydroxylaminechloride in C-17 position.

甾体药物的合成原料一般为薯蓣皂素、剑麻皂素、番麻皂素等，随着薯蓣资源日渐枯竭，使得甾体药物工业不得不寻求新的原料，而微生物降解胆固醇和植物甾醇合成雄烯二酮获得成功，使得AD成为新兴的甾体原料吸引了人们的注意。

Sticky ends -- Descriptive of the structure of a double-stranded polynucleotide in which one strand extends further from the end than the other to create a single-stranded 'tail'; especially the product of cleavage by a restriction endonuclease at a palindromic sequence.

转移核糖核酸--核糖核酸的一种，当蛋白质合成时，当氨基酸与信使核糖核酸的转接器。

Since Watson and Crick have brought forward the model of DNA helix structure and explain about it's reproduce mechanism in molecule level, research work concerning DNA has been continuously lucubrated. However, whether translating inheritance information and rebuilding DNA molecule via menstruating DNA sequence, or to date the most compelling gene project, chromosome protract et. al, there all need a sort of molecule scissors cleaving DNA, DNA cleavage reagent. At present, tool enzyme of cleaving DNA is mostly DNA restriction enzymes founded in 70 years, which only cleave DNA at specific 4-8 base pair sequences that are usually palindromic, so this restricts the at very fast speed developing of gene technology at certain extent.

自从Watson和Crick提出DNA的双螺旋结构并对其复制机制在分子水平上进行解释后，使得对DNA的研究不断深入，但无论是通过测定DNA的序列来破译遗传信息、改造DNA分子，还是目前最令人关注的基因工程、染色体绘制等，都需要一种断裂DNA分子的&剪刀&——DNA断裂试剂，目前断裂DNA的工具酶主要是上个世纪70年代发现的DNA限制性内切酶，但所知的Ⅱ型限制性内切酶的DNA序列识别长度较短（约为4～8个碱基对），而且一般要求回文结构，这就给飞速发展的基因工程技术带来一定的限制。

Sticky ends -- De script ive of the structure of a double-stranded polynucleotide in which one strand extends further from the end than the other to create a single-stranded 'tail'; especially the product of cleavage by a restriction endonuclease at a palindromic sequence.

转移核糖核酸--核糖核酸的一种，当蛋白质合成时，当氨基酸与信使核糖核酸的转接器。

HPV infection can arouse the cleavage and proliferation of cholesteatoma epithelium and may play certain role in the occurrence and development of middle ear cholesteatoma. Aggressive, papillomatous growth and koilocytes can be served as the initial proof of HPV infection in cholesteatoma of the middle ear.

HPV感染可能激发中耳胆脂瘤上皮的分裂增殖，在中耳胆脂瘤发生发展中起一定的作用；侵蚀性乳头瘤样生长和空晕细胞改变可以作为中耳胆脂瘤组织中HPV感染的病理学证据。

In this study, the effects of STH and insulin on porcine in vitro oocyte maturation and cleavage after parthenogenetic activation were investigated.

研究了生长激素、胰岛素单独或者联合作用对猪卵母细胞体外成熟及孤雌激活后卵裂的影响。

The photolysis of deoxyadenosylcobalmin and methylcobalamin in water was studied. The results showed that the speed of photolytic cleavage is related to photolytic energy.

采用HPLC检测法研究5，脱氧腺苷钴胺素和甲基基钴胺素的水溶液在不同光源及不同照度下的光解情况，结果表明随着光能量的增加光解速度加快。

The polyspermy rate was significantly decreased when the semen samples were stored for longer (3 days). Some cleavage embryos were collected to identify their sexes in 3-4 days after in vitro fertilization. The ratio of male embryos, produced from the BTS semens stored for 1 and 3 days, were 60 % and 41 %, respectively, and 35 % and 48 % in the MIII semens.

使用不同稀释液，保存1与3日之精液进行体外受精，在培养3 - 4日后收集卵裂胚进行性别鉴定，在保存1日与3日之稀释液BTS组，雄胚性比率分别为60 %与41 %；在稀释液MIII组，保存1日与3日之雄性比率分别为35 %与48 %。

A single point mutation in intervening sequence 2 (IVS2) of human mitochondrial arginyl-tRNA synthetase gene causes abnormal cleavage of its transcript, resulting in pontocerebellar hypoplasia.

人线粒体精氨酰-tRNA合成酶基因2号内含子中的一个单点突变导致该基因的转录本被异常剪接，造成脑桥小脑发育不全。

The cleavage and pronuclear formation rate of oocytes treated with 5μmol/L Ion were significantly higher than that of oocytes with EH treatment.

结果发现，5μmol／L Ion激活处理水牛卵母细胞分裂率（63.0％vs 54.2％，P＜0.05）及原核形成率显著高于EH处理的卵母细胞。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。