查询词典 ring bearer

If ring eRe and (1 - e)R(1 - e) are both left morphic rings, then R is also a left morphic ring.

如果eRe和(1-e)R(1-e)都是左morphic环，则R也是左morphic环。

Poly(ethylene-2,6,-naphthalate) is a newly developed polyester. The chemical structure of PEN can be described by replacing the benzene ring in poly with the stiffer naphthalene ring.

聚萘二甲酸乙二酯是一种近年来获得较大发展的高性能聚酯材料，其分子结构与聚对苯二甲酸乙二酯相类似，可看作是由PET链中苯环由刚性更大的萘环所替代的产物。

The conjugated rings affect the bioactivity most. Antitumor activity was greatly improved through changing the phenyl ring with a naphthyl ring.

下端共轭环对活性的影响最大，将下端的共轭环扩大的过程中，将苯环改为萘环，其活性提高了近一个数量级。

If the sapphire ring is for engagement then remember at some point the ring will be worn along side another so you do not want them to clash or for one to outstand the other.

如果蓝宝石戒指是接触，然后记得，在某一点上环会磨损沿另一侧所以你不希望他们发生冲突或一至凸现的。

Starting from 4-androstenedione, three novel 3-oxo-4-aza-5-androstene-17-oxime derivatives 7, 8 and 9 were synthesized through oxidation ring cleavage, amination ring closure, oximation,and substitution .

以4雄烯二酮为起始原料，经过氧化开环、氨解闭环、肟化、取代等4-步反应，合成了3个新的3-羰基-4-氮杂-5-雄甾烯-17肟衍生物7、8和9，并用质谱、1HNMR、13CNMR等测试手段对目标化合物的结构进行了表征

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。

Parasternal short axis view showed two ring echoes,which was named 2DE ＂double-ring sign＂.

2DE胸骨旁大动脉短轴观显示两条大动脉呈两个环状回声，称2DE&双环征&。

This result again showed that in the process of the reaction of flavonoidswith α-hydroxy ethyl peroxyl radicals, 2,3-double bond in the C ring of flavonoidsplays a more important role than o-dihydroxy in the B ring.

这进一步说明了黄酮类化合物与有机过氧自由基反应的过程中C环2，3双键比B环邻二羟基起着更重要的作用。

It can beconcluded from the experimental results that in the reaction of flavonoids withα-hydroxy ethyl peroxyl radicals, 2,3-double bond in the C ring plays a moreimportant role than o-dihydroxy in the B ring.

从实验结果来看，在黄酮类化合物与有机过氧自由基反应的过程中，其分子结构中起主要作用的是C环2，3双键，而不是B环的邻二羟基。

The synthetic route starts from penicillin G, peroxyacetic acid(8.5%) as Oxidizing Agent to get penicillin G sulfoxide; esterifided with p-nitrobenzyl bromine to synthesize penicillin G sulfoxide ester; we synthesize 3-exomethylenecepham sulfoxide ester with phthalimide potassium and 4A molecular sieve as acid scavenger to open the ring, SnCl_4 as catalyzation to close the ring. The yield is over 60%.

本研究采用的合成路线为：以青霉素G钾盐为原料，选用工业过氧化氢制备的过氧乙酸(22.3%)稀释至8.5%为氧化剂，氧化得青霉素亚砜；采用对硝基溴苄为酯化试剂，制备青霉素亚砜酯；以NCP(N-氯代邻苯二甲酰亚胺)为开环试剂，酞酰亚胺钾和4A型分子筛为酸清除剂，顺利开环；再经无水SnCl_4催化闭环得3-环外亚甲基头孢亚砜酯，最终产率在60%以上。

In other research, chondroitin is being investigated for use in several other conditions.

在其它研究，软骨素被调查用於几个其它情况。

They would make fun of him for having to work.

他们拿他的工作来开玩笑。