酯

The functional groups of protozoa community were damaged with the addition of fenvalerate. Bectivoresdetrivores were the tolerant species, and their predomination became more obvious with the increase of fenvalerate concentration.

加入氰戊菊酯后，原生动物的群落结构发生变化，各个功能类群均受到不同程度的损伤，一些食菌和碎屑者类原生动物对氰戊菊酯表现出较高的耐受性，随着氰戊菊酯浓度的增加，其在群落中的优势度更加明显。

Analysis of the material change, garlic cells bioactive aliphatic thio cysteine sulfoxide and thiosulfate propenyl cysteine sulfoxide sulfur compounds in garlic, such as the role of enzymes, the generation of thiobarbituric acid sub - ester, propylene-based thiosulfinates, allyl thiosulfinates as garlic pigment precursor substances, and further changes occurred in the green garlic.

从物质变化分析，大蒜细胞中的生物活性物质硫代脂肪族半胱氨酸亚砜和硫代丙烯基半胱氨酸亚砜等含硫化合物在蒜酶的作用下，生成硫代亚磺酸酯、丙烯基硫代亚磺酸酯、烯丙基硫代亚磺酸酯，作为大蒜色素物质的前体，进一步发生大蒜绿变。

The title anti-fogging coating was prepared from film-forming substance such as UV curing of n-butyl methacrylate,β-hydroxy ethyl acrylate,acrylamide and sodium propenyl alkyl ether hydroxyl sulfonate,and proper solvents, crosslinker s,photoinitiators and additives.

以光敏丙烯酸酯低聚物、甲基丙烯酸丁酯、丙烯酸-β-羟乙酯、丙烯酰胺及丙烯基烷醚羟磺酸钠为主要成膜物质，再配以适量的溶剂、交联剂、光敏剂及各种助剂制成UV固化防雾涂料。

Synthesis of dipropyl carbonatefrom dimethyl carbonateand propyl alcohol by transesterification was studied.

用丙醇和碳酸二甲酯液相酯交换合成碳酸二丙酯，筛选出催化性能和稳定性较好的KOH/Naβ固体碱催化剂，考察了KOH负载量对催化剂酯交换性能的影响。

Separation of Cadmium by Iodide-4-Aminoantipyrine-Propyl Alcohol Extraction System in the Presence of Ammonium Sulphate;2. Synthesis of dipropyl carbonatefrom dimethyl carbonateand propyl alcohol by transesterification was studied.

用丙醇和碳酸二甲酯液相酯交换合成碳酸二丙酯，筛选出催化性能和稳定性较好的KOH/Naβ固体碱催化剂，考察了KOH负载量对催化剂酯交换性能的影响。

Methyl, Propyl, Butyl and Ethyl Paraben — Used as inhibitors of microbial growth and to extend shelf life of products.

甲基、丙酯、丁酯和尼泊金乙酯——它们的作用是微生物生长抑制剂，并可延长产品的保质期。

Thus, the optimum synthesizing condition was found here, namely input material ratio 3 to 1, reaction temperature 67℃, and reaction time 3 hours. The hydrolysis process of the pyrophosphate byproduct, which is brought by phosphating reaction, is also discussed well in this paper and the full hydrolysis condition of pyrophosphate is obtained finally.

论文对副产物焦磷酸酯的水解反应进行了研究，得到了焦磷酸酯完全水解的条件：水解温度为80℃、水的用量为4%、水解时间为12小时，解决了因焦磷酸酯存在而造成的对磷酸化反应产物分析困难的问题。

The study employed fenpropathrin to jeopardize pregnant rats modeling as the experimental object to observe and analyze the effective of fenpropathrin to the pregnant SD rat itself, the filial generation and the reproductive capability.

以甲氰菊酯染毒妊娠大鼠模型为实验对象，观察、分析甲氰菊酯对母体、妊娠及子代生长发育和生殖能力的影响，评估甲氰菊酯对免疫系统、神经系统及生殖系统的可能损害，并初步揭示其机理。

A new method for synthesizing rosin allyl alcohol ester was studied. p-Toluenesulfonic acid allyl alcohol ester was first synthesized by O-acylation of allyl alcohol with p-toluene sulfonyl chloride, using NaOH as catalyst. Then rosin allyl alcohol ester was synthesized from sodium resinate and p-toluenesulfonic acid allyl alcohol ester.

探索了一种两步合成松香烯丙醇酯的新方法，即先以烯丙醇和时甲苯磺酰氯为原料，以NaOH为催化剂，通过O-酰化反应合成中间体对甲笨磺酸烯丙醇酯，再与松香钠皂发生亲核取代反应合成目标产物松香烯丙醇酯。

The present study was undertaken to explore the effect of DM and/or PM on EAA to provide some scientific basis for the thorough revealment of excitatory neurotoxic mechanism of pyrethroids as well as for the prevention and treatment of poisoning by pyrethroids.

本文旨在研究溴氰菊酯和氯菊酯对以谷氨酸为代表的兴奋性氨基酸的影响，为彻底探讨拟除虫菊酯类农药的神经毒作用机理，为拟除虫菊酯中毒的预防和治疗提供科学依据。

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。