酯

The obtained linolenic acid glyceride was flavescent oleaginous liquid with acid val.

采用直接酯化法，以亚麻酸和甘油为原料，以脂肪酶Novozym 435为催化剂在无溶剂体系和有溶剂体系中合成亚麻酸甘油酯。

The mixture from butyl acetate and propyl propionate was the most attractive to A. glabripennis in the olfactometer when these volatiles were mixed each other.

而这些挥发物相互混合后，以丙酸丙酯和乙酸丁酯的混合物效果最为明显，在嗅觉仪中对光肩星天牛有较强的引诱作用。

Nepetalactone, the primary component of catnip oil, were extracted by the using method of simultaneous distillation-extraction and separated by using silica gel chromatography column. To compare the repellency of nepetalactone and DEET on mosquitoes, topical bioassay method on the skin and a cage olfactometer were employed to assess the effective protection time and the spatial repellency.

采用同时蒸馏萃取及硅胶柱层析法从猫薄荷Nepeta cataria植物中提取、分离制得驱蚊有效成分假荆芥内酯，并采用个体涂肤有效保护时间测定法及风洞空间驱避效果测试法，对假荆芥内酯与避蚊胺的驱蚊效果进行了对比试验。

The efficacy of three formulations to B.germanica was evaluated with a small container and a quadr-cage olfactometer system. Results The linalool deploied with aethylenum-Vac granule and activated alumina granule had obvious repellency to B.germanica, and 97.7% repellency of the former was more effective than the latter.

结果 芳樟醇-乙烯醋酸乙烯酯颗粒剂与活性氧化铝颗粒剂对德国小蠊有明显的驱避性，其中芳樟醇-乙烯醋酸乙烯酯颗粒剂优于后者，驱避性高达97.7%，而芳樟醇。

PP was taking as basic material,and blended with ethylene propylene rubberby means of melt blending to prepare easy openable infusion bottle-cover materials,in which a certain amount of LDPE and plasticizer was added to improve the compatibility and mechanical properties of the blend.

以聚丙烯为基材，与二元乙丙橡胶用熔融共混的方法，制备易开启式输液瓶外盖用料，并加入一定量的低密度聚乙烯和增塑剂以改善体系相容性和力学性能，讨论了增塑剂邻苯二甲酸二辛酯、乙酰柠檬酸三正丁酯及丙三醇对共混体系力学性能的影响。

Several transient compounds were synthesized by the homo- and heterogeneous reactions of reactive halogen compounds, In-situ ultraviolet photoelectron spectroscopy and photoionization mass spectroscopy as well as theoretical calculations were used to study their molecular structures, stability and molecular orbital properties, their electronic structures and geometric structures were obtained for the first time; Simultaneously, the electronic structure and thermal dissociation of acetyl peroxynitrate and trifluoroacetyl peroxynitrate which have great importance in the atmospheric chemistry were studied; The substituent effects of series of halopyridines and halothiophenes were studied by the ultraviolet photoelectron spectroscopy method for the first time. The atmospheric chemical reaction between peroxyacetyl radicals with IO radicals as well as the dissociation of the most stable isomer of CH3COIO3 were calculated by density functional theory, it was found that the CH3COOIO2 isomer may be act as a new reservoir of inorganic iodine in the stratosphere.

通过活性卤素的系列均相与非均相化学反应合成了几种瞬态物种，采用原位紫外光电子能谱和光电离质谱结合量子化学理论计算对化合物的分子结构、稳定性以及分子轨道特性进行了研究，首次获得了这些物种的电子结构和几何结构的信息；同时研究了大气中有重要作用的乙酰过氧硝酸酯和三氟乙酰过氧硝酸酯的电子结构性质及热解过程；采用紫外光电子能谱手段首次研究了系列卤代吡啶和噻吩的取代基效应；通过量子化学理论计算研究了乙酰基过氧自由基与IO自由基的大气化学反应及其最稳定异构体CH3COOIO2的解离，发现该物种可能是无机碘化合物在平流层中的储库物种。

The constituents were extracted by some solvents. 18 constituents were isolated from Chloroform fraction by different chromatography. 15 constituents were identified by IR ,MS and NMR as follows: 3-sitosterol, P-sitosterylpalm itate,succinate acids, 1, 4-benzenediol, 1, 2-benzenediol, p-hydroxybenzaldehyde, syringaresinol, oleanolic acid, usolic acid, ethyl caffeate , Rosmarinic acid ethylster and etc. In such constituents ,nine compounds were isolated for first time from Origanum vulgare L..

牛至药材经水煮醇沉法所得浸膏，利用溶剂法和色谱法从中分离得到18个单体成分，通过IR、MS、NMR等波谱技术鉴定了其中的15个化合物，分别为β-谷甾醇(1)、β-胡萝卜苷(2)、琥珀酸(3)、对-二苯酚(4)、邻-二苯酚(5)、对羟基苯甲醛(6)、1.2-二羟基-4-异丙基-5-甲基苯(7)、新木脂素(8)、丁香脂素(9)、齐墩果酸(10)、乌苏酸(11)、4-二十六烯(12)、正二十六醇(13)、咖啡酸乙酯(14)、迷迭香酸乙酯(15)等，其中化合物3、4、5、6、7、8、9、14、15等9种化合物均为首次从该属植物中分离得到。

Firstly, mixture of orthophosphate or sodium tripolophosphate was used as esterifying agent in preparation of cassava starch phosphaite by dry process.

首先，用混和正磷酸盐或三聚磷酸钠为酯化剂，干法制备高取代度木薯淀粉磷酸酯。

It polar solvent a peroxyorganic acid is used to oxidate steroid sapogenin to obtain steroid lactone with C22 and 3 methyl-gamma-butyrolactone.

在极性溶剂中用过氧有机酸氧化甾体皂甙元，得到具有22碳的甾体内酯和3－甲基－γ－丁内酯。

In this paper six carbazole oxime ester derivatives were synthesized through Friedel-Crafts acylation, oximation and esterification from N-alkyl-carbazole.

以N-烃基咔唑为原料，经Friedel-Crafts 酰化、成肟和酯化反应，合成了6种咔唑肟酯衍生物。

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。