经产

Bromo-2′,4′-dichloroacetophenone was synthesized in three steps,w hich were bromization ,chlorination and acylation,from glacial acetic acid and m -dichlorobenzene.

以冰乙酸和间二氯苯为原料，经溴化、氯化、酰化三个步骤，制得 2—溴- 2′，4′-二氯苯乙酮，产率达 70 %。

Adding methylbenzene into the reaction system as cosolvent ,this can lower the uste amount of DMF and the cost of production .when we chlorinate the Vilsimer reagent and phosphorus oxychloride to sucroste-6-ethal ester is one to ten ,the result of chloridization is the...

探索了氯化后不经三氯蔗糖单酯结晶提纯，直接制备三氯蔗糖的新方法，通过大孔树脂柱，得到了纯度大于95%的产品，终产率高于37%。

Using CMC plate screening method, a marine strain QM11 that can produce alkaline cellulase is isolated from the seawater of Qingdao coast. According to the 16S rDNA analysis, the strain belongs to the Cytophaga fucicola .

中文摘要：用CMC平板筛选方法，从青岛近海海域海水中分离出一株产碱性纤维素酶的海洋菌株QM11，经16S rDNA鉴定，该菌株为 Cytophaga fucicola 。

In the second part of this thesis, a formal [2+2] cycloaddition ketenes and dialkyl azodicarboxylates was studied. We found that by adjusting the substituents in the diazenes, the reaction mode can be completely switched, and furnish four-membered-ring products, aza-b-lactams, the enantioselectivity was up to 91%.

经研究发现，通过对偶氮化合物取代基团的改变，我们可以实现[4+2]环加成反应到[2+2]环加成反应的转变，在手性氮杂环卡宾的作用下，对具有各种取代基的烯酮都可以很好的产率得到氮杂b-内酰胺，其对映选择性最高可以达到91%。

Qianshan Safety Net Factory covers areas 6,600 sq.m , architectural areas for 3,500 sq.m, possessing more than No.30 sets including drawbench introduced from Taiwan and perfect testing equipments .Among these ,key equipments of production :plait machine made by German whose maximal scope reach 175 inch.

潜山县安全网厂厂区占地6600平方米，厂房建筑面积3500平方米，拥有包括引进台湾产拉丝机在内的生产设备30余台及完善的检测设备，其中关键生产设备--经编机系德国制造，最大生产门幅可达175英寸。

In the fourth chapter, 5-phenyl-1,2,4-triazine(3) was synthesized from(5-phenyl-1,2,4-trizin-3-yl)hydrazine in the presence of sodium ethoxide firstly. Themerit of this process was simplification of operation and good yield (more than 90%),which to our knowledge has not been reported so far in literature.

第四章首先以(5-苯基-1，2，4-三嗪-3-基)肼为原料，在乙醇钠作用下经一步反应，合成了化合物5-苯基-1，2，4-三嗪(3)；该法操作简单，产率高(＞90％)，迄今未见文献报道。

In the paper four strains Leu.1, Leu.2, Lact.l and Lact.2 were isolated from many sorts of pickles for their excellent characteristics in acid production and fermentation flavor. With API 50 CH system, Leu.l and Leu.2 were identified as Leuconostoc mesenteroides subsp.

本论文从多种泡菜中筛选出四株产酸较快、发酵风味好的乳酸菌Leu.1、Leu.2、Lact.1和Lact.2，经API 50 CH标准系统鉴定，Leu.1和Leu.2为肠膜明串珠菌肠膜亚种Leuconostoc mesenteroides subsp。

After this system having been tested five times of breeding terms, Penaeus monodon and Litopenaeus v annamei were able to be raised up to market size, and it also is able to be raised up by stage-by-stage raising method and meet with the requirement of mass production.

本系统经在水产试验所台南分所试验场五期养殖试验，已能将草虾及白虾养至上市体型，且符合阶段性虾类养殖及量产之要求。

In this paper, adopted augmenting culture in nitrite bacteria culture media and the method of silica gel plate isolation,31 strains of bacteria were isolated from vegetable garden soil of our school. The color reaction test was carried out with Griess reagent and culture fluid, which was regarded as the index to determine producing NO2- or not. 13 strains which color were deep were obtained and they were further rescreened by doing nitrite test. A strain N4(coded N4,the same to the following)with higher rate of nitrosification was picked up after rescreened; A strain B08( coded B08 ,the same to the following) with higher rate of denitrification was obtained after isolated and rejuvenated from our lab conserving mixed denitrifying bacteria culture.

本研究采用亚硝化细菌富集培养基选择培养和硅胶平板分离法，从本校农场菜园土中分离到31株细菌，以格利斯试剂对培养液的反应颜色深浅作为指标衡量其产NO_2~-的多少，经初筛从分离株中筛选出13株格利斯试剂反应颜色较深的菌株，再对这13株菌作亚硝化试验，最终选出一株亚硝化速率较高的菌株(编号为N_4，下同)；另外，通过对本实验室保存的反硝化细菌混合菌液进行分离复壮，筛选出一株反硝化速率高的菌株编号为B_

Noncondensible gas(7%～33%,consisting of CO,CO2,H2 and C1-C2 hydrocarbons),liquid(water and oil phases,26%～45%)and solid residues(31%～51%)were collected after microwave heating of waste PCB.

结果显示：微波热解得到的气体、液体、固体的产率分别为7%～33%、26%～45%、31%～51%，其中气体主要由CO、CO2、H2及有机烃类组成，可燃性气体占70%左右，可作为燃料气加以利用；液体分为水相及油相，经常压蒸馏后得到的120～250℃馏分主要为单酚化合物，苯酚高达50%左右，甲基苯酚和邻甲基苯酚为25%以上，是良好的化工原料；固体中除炭外，还含有许多金属如铅、锡和铜等，可以回收利用。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。