异构体

The channel for producing COOH-+H2,contributed from both aldehydic hydrogen abstraction and nucleophilic addition,is the most favorable channel.

通过计算提出亲核加成过程的反应通道，主要产物生成H2和生成COOH-/HCOO-/OCHO-异构体。

Their diasteroisomers were achieved because the group of alkoxy assaulted C_1 of 2-deoxyribofuranosyl chloride from different directions.

因烷氧基可从呋喃脱氧糖环的不同方向进攻1-位碳原子，因而所得到的烷基呋喃脱氧戊糖苷是一对非对映异构体。

The pure isomers 3-(1-hydroxyethyl)-8-vinyldeuteroporphyrin Ⅸ and 3-vinyl-8-(1-hydroxyethyl)deuteroporphyrin Ⅸ were obtained from protoporphyrin Ⅸ dimethyl ester.Starting from these two acetylating compounds,eight new porphyrin derivatives were synthesized through an alkyloxy fission reaction.

以原卟啉Ⅸ二甲酯为起始原料，合成并分离得到3-(1-羟乙基)-8-乙烯基次卟啉Ⅸ（Ⅱ1）和3-乙烯基-8-(1-羟乙基)次卟啉Ⅸ（Ⅱ2）二个异构体，两者分别经酰化后与醇进行烷氧裂解反应合成了8个全新的卟啉衍生物。

Allene is an isomer of methyl acetylene.

丙二烯是甲基乙炔的一种异构体。

Aim:COX is the rate-limiting enzyme in the synthesis of PCs from arachidonic acid.

目的： 环氧化酶是前列腺素合成的限速酶，环氧化酶-2(COX-2)是其中的一种异构体。

This thesis mainly focus on the Enzyme histochemistry and TEM observation of trunk muscle from Branchiostoma belcheri tsingtauense; isolation and recombinant expression of Bbt-myosin heavy chain isoforms; characterization and expression of Bbt-nascent-polypeptide-associated complexαsubunit.In NADH Enzyme histochemistry, two types of muscle lamella can be distinguished .

本论文主要对青岛文昌鱼(Branchiostoma belcheri tsingtauense)肌肉组织进行了酶组织化学实验和电镜观察，分离了青岛文昌鱼肌球蛋白重链基因异构体并将其重组表达；克隆了青岛文昌鱼新生肽链相关复合体α亚基基因，并检测了其时空表达情况。

Fullerenes , the cagelike molecules, comstitute the third form of pure carbon, in addition to diamond and graphite.

除片层石墨和网状金刚石外，封闭笼形的〓是碳的第三种同素异构体。

Fullerenes , the cagelike molecules, comstitute the third form of pure carbon, in addition to diamond and gr...

除片层石墨和网状金刚石外，封闭笼形的〓是碳的第三种同素异构体。

The gaseous isomers and crystalline state of carbohydrazide were studied at the DFT-B3LYP/6-31G** level.

对碳酰肼异构体及其晶体进行了DFT-B3LYP/6-31G**理论水平的计算研究。

An expression vector for one isoform of the mbC α1 subunit cDNA was constructed using the human cytomegalovirus promoter to direct expression and this expression vector was used in a novel transfection assay of primary cultures of bovine adrenal chromaffin cells.

为表达具有生物活性的钙离子通道，将mbC的一个异构体的蛋白编码区插入到由人的涎腺病毒启动子控制表达的质粒中。这个表达质粒

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。