反式异构体

其中，反式异构体生理活性强于顺式异构体，单体的活性大于糖苷。

Among them , the physiologically active of trans-isomer is stronger than the cis-isomer , the monomer activity greater than the glucoside .

建立了HPLC法测定米格列奈钙的反式异构体和R-异构体。

HPLC method was established for the determination of the trans-isomer and R-isomer of mitiglinide calcium .

目的建立HPLC法分离测定那格列奈（A4166）及片剂中顺反式异构体含量。

Objective To establish a HPLC method for the separation and determination of the cis-isomer in nateglinide and tablet .

结果以高收率获得了目标化合物，发现反式异构体ZX-5能促进细胞NO的释放，选择性增加脉络膜血流，而顺式异构体ZX-4无此药理作用。

RESULTS The target compounds were prepared in high yields . Trans isomer ZX-5 released significant amount of NO and specifically increased the choroidal blood flow , while cis isomer ZX-4 did not show these activities .

结论反式异构体淬灭羟自由基的能力比顺式异构体强。

CONCLUSION This observation also suggests that E-isomer has a stronger ability to quench radical than Z-isomer did .

醋炔诺酮肟顺、反式异构体的分离、鉴别与其抗生育活性的比较

Studies on the separation and identification of anti-and syn-isomers of norethisterone acetate oxime and comparison of their antifertility activity

在烯烃的顺式与反式异构体中，处于碳碳双键两端的顶点间的距离是不同的。

The distances among the vertices spaced by the double bond are different in the cis-alkenes from those in its trans-isomers .

硫化物的存在，降低油脂氢化速率，大量产生反式异构体产物，对选择性氢化的影响尤其严重。

The sulphide in oil and fat will lower their hydrogenation rate , bring about a lot of anti-isomer products and affect the selective hydrogenation very seriously .

平衡产物经浓缩结晶，可获得以固体原料计38%以上的较纯（93%）反式异构体。

By means of concentration and crystallization , an overall yield of more than 38 percent of pure trans isomer ( 93 % ) can be obtained from equilibrium products .

路线二和路线三中用苯甲酯保护活泼羟基，并可以分离顺式和反式异构体。

In the second route and third route , the insertion of benzoylation can effectively protect the active methylol radical and may advantageously be employed to facilitate the separation of cis - and trans-forms of the intermediate .

用以上3种成份，纯顺式或含有1.5%反式异构体，制成的诱芯在北京郊区和苏州郊区于春季或秋季均可测出蛾高峰，可有效地用于虫情测报。

The traps baited with the ternary mixture , pure or containing 1.5 % ( E ) - isomers , have all been used effectively as a monitoring system for the diamondback moth in spring and autumn in Beijing suburbs and Su Zhou county .

顺、反式结构对MPV异构体的分子构型和吸收光谱的影响

Influence of cis and trans structures on molecular conformation and UV spectra of MPV isomers

并结合尿素与硫脲的催化反应过程，讨论了氢键复合物两种可能的顺反异构并分析比较了顺反式构象的异构体之间的稳定性大小。

Two possible hydrogen bonding complexes conformations , cis and trans , were discussed and the energy gaps between them were analyzed , in combination with the catalytic reactions .