酯

The enzymatic synthesis of 6-O-lauroylsucrose was performed by transesterification of sucrose with vinyl laurate in a medium constituted by two solvents.

提出了一种酶催化合成蔗糖-6-月桂酸单酯的新方法：在两种有机溶剂混合组成的媒介中，蔗糖与月桂酸乙烯酯在脂肪酶的选择性催化下通过酯交换反应定向合成蔗糖-6-月桂酸单酯。

The results show that the optimal parameters of esterification are as follows: 4% of SO42-/ZrO2, molar ratio of methanol to litsea cubeba kernel oil 101, 68 ℃ of reaction temperature and 4 h of reaction time, the acid value decreases to 2.52 mg/g. Compared with the traditional acidic-catalyzed method, this method has the advantages of no acid proof equipment, easy to recycle catalyst and no acidic waste water emission. The optimal parameters of transesterification are as follows: 25 ℃ of reaction temperature, 0.5% of hexadecyl-trimethyl-ammonium bromide, 1% of NaOH, molar ratio of methanol to the oil 61 and 15 min of reaction time. The ester exchanging rate is 97.6%. This method adopts phase transfer catalyst and produces industry prospect, which has many advantages such as energy-saving and time-saving under room temperature.

研究结果表明，固体酸SO42-/ZrO2催化酯化反应的最佳条件为：油重4%的SO42-/ZrO2，醇油摩尔比为101，温度为68 ℃，反应时间为4 h，原油酸值降到2.52 mg/g；该法相对浓硫酸催化酯化法具有不需耐酸设备、催化剂易回收、无废水排放等优点；相转移催化酯交换反应的最佳条件为：温度为 25 ℃，0.5%的十六烷基三甲基溴化铵，油重1%的NaOH，醇油摩尔比为61，反应15 min，原油酯交换率达到97.6%；采用相转移催化技术，反应在常温下进行，大大减少了能耗，缩短了反应时间，具有的产业化前景。

Gas chromatograph/mass spectrometer system was used to analyze polycyclic aromatic hydrocarbon (PAHs, including naphthalin, anthracene and fluoranthene) and phthalic acid ester [PAEs, including dimethyl phthalate, diethyl phthalate, diisobutyl phthalate and di(2-ethylhexyl) phthalate] concentration in water samples taken from every treatment units of a large-scale waterworks in a western city whose water source is the upstream of Yangtze river.

以多环芳烃(包括萘、蒽、荧蒽三种物质)和邻苯二甲酸酯包括邻苯二甲酸二甲酯(DMP、邻苯二甲酸二乙酯、邻苯二甲酸二异丁酯、邻苯二甲酸二(2-乙基己基)酯4种物质作为研究对象，采用GC-MS方法测定了以长江为原水的某大型城市给水厂各工艺段水样中的上述物质。

Conditions to prepare the NHS-esters of all olefine acids" and polymer-NHS esters were studied. And these products" basic physical and chemical properties were also tested.

研究了合成烯酸NHS酯及聚合物的NHS酯的合成条件，测试了烯酸NHS酯及聚合物NHS酯的特性。

At present,The main products in clue enameled wire 、Polyester enameled wire、Polyurethane enameled wire、Polyamide over polyyrethane enameled wire、Polyamide overcoated polyester enameled wire、Solderable polyester-imide enameled wire、Polyester-imide enameled wire、Amide-imide overcoated polyester0imide enameled wire、Amide-imide enameled wire、 Nylon fusable enameled wire ,the production specification is Φ0.04-Φ0.08 millimeter.

目前公司主要产品有铜包铝漆包线、聚酯漆包铜线、聚胺酯漆包铜线，尼龙外被聚胺酯漆包铜线、尼龙外被聚酯漆包铜线、直焊变性聚亚胺酯漆包铜线、聚酯亚胺漆包铜线、硫胺亚胺外被变性聚酯漆包铜线、聚硫胺亚胺酯漆包铜线、尼龙热熔漆包铜线，生产规格为Φ0.04mm－Φ0.80mm。

Reaction of 9-bromofluorenewith diethyl malonate and sodium carbonate gives diethyl 2-(9-Fluorenyl)malonate.Aminolysis of diethyl 2-(9-Fluorenyl)malonate in ethylenediamine and propylene diamine give〓 and 〓, respectively.〓 and 〓 were synthesized by the reaction of 9-bromofluorene with oxalyl bisethylenediamine. Copper and nickel complexes of 〓 and 〓 were obtained by the reaction of 〓 and 〓 with copper and nickel salt, respectively, in aqueoussolution and extrusion of two hydrogen ions from the amide groups.

使9-溴芴与丙二酸二乙酯在无水碳酸钠存在下反应合成出2-(9-芴基)丙二酸二乙酯。2-(9-芴基)丙二酸二乙酯在乙二胺中胺解得到配体〓，2-(9-芴基)丙二酸二乙酯在1，2-丙二胺中胺解得到配体〓，使9-溴芴与草酰二乙二胺作用得到配体〓和〓与相应的金属盐作用分别得到它们的铜、镍配合物。

Results Nine compounds from supercritical CO2 extraction were identified and the main constituents were pentadecane, ethyl pmethoxycinnamate and ethyl cinnamate. Twentyeight compounds from water distillation were identified and the main constituents were δ3carene, ethyl pmethoxycinnamate and ethyl cinnamate.

结果 沙姜超临界CO2萃取物中分离鉴定出9种化合物，主要成分为十五烷、肉桂酸乙酯、对甲氧基肉桂酸乙酯等；水蒸气蒸馏法中分离鉴定出28种化合物，主要成分为δ3蒈烯、肉桂酸乙酯和对甲氧基肉桂酸乙酯等。

Results Nine compounds from supercritical CO2 extraction were identified and the main constituents were pentadecane, ethyl p-methoxycinnamate and ethyl cinnamate. Twenty-eight compounds from water distillation were identified and the main constituents were δ-3-carene, ethyl p-methoxycinnamate and ethyl cinnamate.

结果 沙姜超临界CO2萃取物中分离鉴定出9种化合物，主要成分为十五烷、肉桂酸乙酯、对甲氧基肉桂酸乙酯等；水蒸气蒸馏法中分离鉴定出28种化合物，主要成分为δ-3-蒈烯、肉桂酸乙酯和对甲氧基肉桂酸乙酯等。

In this study, we investigate the effect of benzyl isothiocyanate and phenethyl isothiocyanate on human prostate cancer DU-145 cells, the results demonstrate that benzyl isothiocyanate and phenethyl isothiocyanate induced cause G2 / M phase arrest and apoptosis. These effects are in a dose- and time-dependent manners.

但是苯甲基异硫氰酸酯和苯乙基异硫氰酸酯造成人类前列腺癌细胞株DU-145的凋亡机转则尚未有较详细的报导，所以本研究即是探讨苯甲基异硫氰酸酯和苯乙基异硫氰酸酯造成人类前列腺癌细胞株DU-145的相关凋亡机转。

The synergism ratios of piperonyl butoxide to alpha-cypermethrin in these three strains were similar(about 20-fold), which suggested metabolic detoxification probably confers about 20-fold inherent resistance in the B-type whitefly, as PBO is a mixed function oxygenase and esterase inhibitor and glutathione S-transferase is not affinity to resistance in B. tabaci. The synergism ratio of triphenyl phosphate to alpha-cypermethrin in the NJ strain was 12-fold, which implied the synergism of PBO in the B-type whitefly is mainly due to inhibiting esterase activity.

增效试验表明PBO对这三个品系的增效作用均为20倍左右，因为在烟粉虱中PBO即是多功能氧化酶抑制剂，也是酯酶抑制剂，而谷胱甘肽S-转移酶与抗性无关，因此推断代谢酶在B型烟粉虱对高效氯氰菊酯的抗性发展中起到的相对作用可能为20倍左右，而且这种抗性是B型烟粉虱天生的；TPP对NJ品系的增效作用为12倍，说明PBO增效作用主要是由于抑制酯酶而引起的，即代谢抗性大部分由酯酶所贡献。

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。