At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.此时每条染色体由一对染色单体构成,这两条联合的染色体称为四分体.Microspore abortion occurred after the tetrad formation.小孢子败育发生在四分体形成以后...
Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.大孢子四分体为线形, 合点端功能大孢子发育成为蓼型胚囊.The chalazal megaspore of a linear tetrad develops into a polygonum type sac.四分体线行排列,合点端的大孢子发育为...
阿玛尼的精致工艺很容易博得人们的赞誉。It is easy to appreciate the craftsmanship of Armani.阿姆斯特朗在离目的地还有300米的地方被堵住不能动弹。Armstrong was boxed in with 300 metres to go.她语气之强烈令阿利斯泰尔深感震惊。The violence in her tone gave Alistair a shock....
Objective To study the catalytic activity of potassium bisulfate in synthesizing hexyl hexanoate.目的研究硫酸氢钾在合成己酸己酯工艺中的催化性能.Isoamyl butyrate was synthesized by using potassium bisulfate as the catalyst.以硫酸氢钾为催化剂,正丁酸和异戊醇为原料合...
He is more highly educated, with a PhD in Chemistry.他受过更高的教育，拥有化学博士学位。She's working towards her PhD.她在攻读博士学位.He was awarded his PhD for a thesis on industrial robots.他凭一篇研究工业机器人的论文获得博士学位。...
An uncertain proportion of patients, possibly about 10 per cent, have a third protein abnormality - amyloidosis.还有一部分(比例不确定)病人可能占10%, 有第三种异常蛋白 —— 淀粉样变性.Objective : To explore the clinical characteristics and pathogenesis...