三尖杉碱具有五元稠环结构。
在地球上，烤糊的面包和汽车尾气里都含有稠环芳烃。
On Earth, polycyclic aromatic hydrocarbons are found on burnt toast and in automobile exhaust.
在稠环和桥环化合物中，两个碳原子是两个环公用的。
In fused-ring and bridged-ring compounds two carbons are common to the two rings.
化学不变性差的非稠环芳烃、混环芳烃化合物含量减小。
Meanwhile, there is a low content of compound in unthickened polynuclear aromatic hydrocarbon (PAH) and pah mix which both are poor in chemical stability.
中的杂环可以看作是一个被掩蔽的，处于暂时停顿状态的稠环。
The heterocyele in (4) is a masked fused ring held in abeyance.
含氮稠环衍生物，含该衍生物的药物组合物，和其作为药物的用途。
Nitrogenous fused-ring derivatives, medicinal compositions containing the derivatives, and use thereof as drugs.
催化裂化柴油的稠环芳烃可通过控制氢转移反应速率实现品质最佳化。
The quality of FCC diesel fraction can be optimized by controlling the reaction rate of hydrogen transference of aromatics with condensed rings.
在氮桥的二边，一个双键及一个烯醛基共轭程度大致与二个芳稠环相当。
In the two sides of nitrogen bridge, the degree of conjugation of one double bond with one formyl polyenic group is about equal to two aromatic cycles.
对应用于生物工程的萘、芴、芘、蒽、苊等稠环芳烃衍生物作了概括介绍。
The derivates of naphthalene, fluorene, pyrene, anthracene, acenaphthene and their application in biotechnology were reviewed.
加入少量的萘、蒽等稠环芳烃于庚烷溶剂中，则大大提高高聚物的分子量。
Addition of small amount of polynuclear hydrocarbons, such as naphthalene or anthracene to the heptane polymerization solution raised the molecular weight of the polymer to a considerable extent.
以稠环芳烃为探针，考察了烷基膦酸改性锆镁复合氧化物材料的反相色谱性能。
The reversed phase chromatographic performance of the new packing material was investigated with some polycyclic aromatic hydrocarbons (PAHs) as solutes.
该催化剂在较低的反应温度下，具有高的饱和稠环芳烃的能力和较小的裂解性能。
The results indicated that the RJW-1 catalyst has a high activity for the saturation of polyaromatics at low temperature and a low cracking capability and good stability.
所述含氮杂环状结构为氮杂大环或氮杂稠环或氮杂环状共轭对称或氮杂环状共轭不对称。
The nitrogen hetero atomic shape structure is aza big ring or aza condensed ring or nitrogen hetero atomic ring shape conjugate symmetry or nitrogen hetero atomic ring shape conjugate asymmetry.
一般情况下，馏分的相对分子质量越大、稠环芳香结构和羰基含量越高，则乳状液越稳定。
Generally, the heavier the relative molecular mass, the higher the content of aromatic structure or the higher the content of carbonyl group, the more stable the emulsion is.
本文研究了两类新型稠环芳烃接枝聚硅氧烷固定相的合成，并系统评价了它们的色谱性能、应用于实际样品的分离。
In this paper, two new grafted polysiloxane GC stationary phase were synthesized. Evaluation of their chromatographic properties and separation applied to real samples were tested.
对金陵石化公司炼油厂加氢裂化装置高压空冷器的结垢原因进行了分析，垢物剖析表明该系统结垢物主要由稠环芳烃组成。
The causes of fouling of high pressure air cooler of hydrocracker in Jinlin Petrochemical Company, s refinery were analyzed. The analysis showed that the fouling was formed from polycyclic aromatics.
文章简单地介绍了烟气中稠环芳烃的形成、性质及对人体的危害，并详细综述了植物添加剂降低卷烟烟气稠环芳烃的研究进展。
Not only the formation, characters and harmfulness were introduced, but also the removal of polyclinic aromatic hydrocarbons in cigarette smoke by plant additives was discussed in detail.
根据脂肪烃、多卤联苯、卤代苯和稠环芳烃等80种非极性有机化合物在鱼体中生物富集因子（BCF）的实测数据，建立了有机物在鱼体中生物富集因子的片段常数法估算模型。
Relationship between bioconcentration factor and fragment constants was investigated. A prediction model was developed on the basis of the observed BCF values of 80 non-polar organic compounds.
咪唑并稠合碳环和杂环，它们的制备方法，含有它们的组合物以及它们的应用。
Imidazo-fused iso-and heterocycles, process for their preparation, compositions containing them and their use.
用醇作溶剂、微量的浓硫酸作催化剂，稠合双环氮杂环丙烷衍生物可发生区域选择性氮杂环开环反应。
Bicyclic fused aziridines can generate regioselective ring opening reaction with various alcohols, catalyzed by slight concentrated sulfuric acid.
近年来稠杂环的合成及其生物活性的研究日益成为杂环化学研究的热门课题。
In recent years synthetic work on fused heterocyclic compounds and study of theirs biological activities were a hot topic in the field of study on heterocyclic chemistry.
近年来稠杂环的合成及其生物活性的研究日益成为杂环化学研究的热门课题。
In recent years synthetic work on fused heterocyclic compounds and study of theirs biological activities were a hot topic in the field of study on heterocyclic chemistry.
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