查询词典 aromatic

The molecular charge distribution of the reactivator is affect the reactivating efficacy directly. Moreover its association with hydroximic acid dissociation constant pAa closely, and it will have a great impact on reactivating ability indirectly.(3) There is likely to exist front molecular interaction between Cholinesterase Reactivators and OPC-inhibited AChE, the action sites mainly lie on the aromatic ring, the substitute R and the hydroixic acid group. They act on the aromatic residues of AChE by Π-Π conjugation .(4) The reached results by Comparative Molecular Field Analysis is useful to design new higher efficacy derivatives for 1, 2, 4-oxadiazole class nonquaternary Cholinesterase Reactivators.

2复能剂分子的电荷分布直接影响复活活性，同时对肟酸解离常数pKa具有重要影响，间接影响复活能力；(3)复能剂与磷酰化酶可能存在前线轨道作用，作用部位可能主要在芳香环及其取代基R和肟基上，与AchE的芳香族残基发生л-л电子作用；(4)通过比较分子力场法研究可以指导1，2，4-oxadiazole类非季铵肟胆碱酯酶重活化剂新化合物的合成，可能得到活性更高的复能剂。

Aromatic essential oil can be extracted from about 500-600 kinds of plants,馥诗华 chemists and botanists have selected the most common, safest, most effective and popular 39 aromatic essential oil, among which: orange flower, rose, jasmine, bergamot, lavender, lemon, sandalwood, myrrh, mastic, rosemary, black pepper, cinnamon, clove, Marjoram and chamomile essential oils are outstanding!

有500－600种植物可提炼出芳香精油，馥诗华的化学家、植物学家精选了最常用、最安全的、最见效的、最受欢迎的39种芳香精油，其中：橙花、玫瑰、茉莉、佛手柑、薰衣草、柠檬、檀香、没药、乳香，迷迭香，黑顶胡椒、肉桂、丁香、马郁兰、洋甘菊、十五种精油最为杰出！

A hairy, aromatic perennial herb in the mint family, native to Eurasia and containing an aromatic oil to which cats are strongly attracted.

假荆芥，樟脑草多绒毛的芳香型多年生唇形科草本植物，原产于欧亚，含有十分吸引猫的芳香油

These results suggest that 1O2 formation from the photosensitization of HP results in the oxidation of aromatic amino acids in HSA and the CL is a result of the decay to ground level of excited species generated from the oxidation of aromatic amino acids.

这些实验结果表明，HP光敏化反应产生的单重态氧导致了人血清白蛋白中芳香族氨基酸的氧化，实验探测到的化学发光正是芳香族氨基酸氧化过程中产生的激发态产物返回激发态发出的光子。

The present invention relates to a thermoplastic interpolymer product comprising an alpha -olefin interpolymerized with at least one vinyl or vinylidene aromatic monomer and/or at least one hindered aliphatic or cycloaliphatic vinyl or vinylidene aromatic monomer and, in at least one aspect, is characterized as having substantially synergistic thermal properties.

本发明涉及一种包含与至少一种乙烯基或亚乙烯基的芳族单体和/或至少一种受阻的脂族或环脂族的乙烯基或亚乙烯基芳族单体共聚的α－烯烃热塑性共聚体产物，及至少一方面，其特征为具有实质协同热性质。

The alkoxyl group at 2-position is affected by the steric repulsion due to the two methyl groups at 1, 3-position, which causes the oxygen atom of alkoxyl group to deviate from the aromatic ring plane, hence, the conjugation effect of the oxygen atom with aromatic ring decreases

对于IV〓、IV〓，其1，3-位两个甲基对2-位烷氧基产生空间排斥作用，使2-烷氧基氧原子偏离芳环平面，烷氧基对芳环的助色作用受到削弱。

The invention provides a method for homopolymerizing conjugated dialkene or co-polymerizing conjugated dialkene and monovinyl aromatic hydrocarbon. The method comprises the following steps: the conjugated dialkene is homopolymerized or the conjugated dialkene and the monvinyl aromatic hydrocarbon are co-polymerized randomly. The method is characterized in that at least one alkali metal alkoxide compound expressed by the formula is used as a structure regulator; in the formula, R is linear chain or branched chain alkylidene radical having 1 to 10 carbon atoms; M is alkali metal selected from Li, Na, K, Rb and Cs.

本发明提供了一种使共轭二烯烃均聚或者使共轭二烯烃与单乙烯基芳烃共聚的方法，包括在阴离子聚合条件下使共轭二烯烃进行均聚或者使共轭二烯烃与单乙烯基芳烃进行无规共聚，其特征在于采用至少一种式所示的碱金属醇盐化合物作为结构调节剂，其中R为具有1-10碳原子的直链或支链亚烷基；以及M为选自Li、Na、K、Rb和Cs的碱金属。

The Knoevenagel condensation reactions between aromatic and α,β-unsaturated aromatic aldehydes with barbituric acid can effectively be performed in ionic liquid without additional acid or base catalyst, it is a simple efficient method for the synthesis of benzylidene barbituric acids, which have been widely used in pharmaceutical chemistry as well as in organic synthesis.

芳醛、α，β-不饱和芳醛和巴比妥酸间的Knoevenagel缩合反应能在离子液体中没有酸碱催化剂的条件下顺利进行，是合成在药物化学和有机合成中有广泛用途的苯亚甲基巴比妥酸类化合物的简单有效的方法。

As a result of aromatization of organic matter during the thermal cracking of original bitumen into gas,the aromatic hydrocarbons in the bitumen are characterized by abnormally abundant tetra-and penta-cyclic compounds,and predominated by parent aromatic compounds without alkyl chain,such as fluoranthene,pyrene,chrysene, benzofluoranthene etc.

沥青的芳烃组成独特，富含四、五环芳烃化合物，且以萤蒽、芘、和苯并萤蒽等无烷基取代的母体芳烃化合物为主，反映出沥青裂解成气过程中的有机质芳构化作用。

In this catalyst system, the Knoevenagel condensations of a series of aromatic aldehydes with malononitrile or ethyl cyanoacetate were programmed and a mechanism was postulated as well. When aromatic aldehydes reacted with ethyl cyanoacetate, the corresponding alkenes proved to be E-isomers by 1H NMR.

在该反应体系中考察了一系列芳香醛和丙二氰、氰基乙酸乙酯的缩合反应，并推测了Knoevenagel缩合反应的机理，芳香醛与氰基乙酸乙酯缩合产物经1H NMR检测为E式烯烃。

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。