戊酸

R-4-Methyl-δ-valerolactone was transformed into-methyl 5-bromo-4-methylpentanoate (5) which is a stable and easily reserved reagent.

首次利用甾体皂甙元氧化降解废弃物-4-甲基－δ-戊内酯合成了松叶蜂性信息素(25，3S，7S)-3，7-二甲基－2-十五醇乙酸酯(2)和丙酸酯(3)。

Optimal reaction conditions were as follows: PAAS and SMA at weight ratio of 4:1, stirring for emulsifying at speed of 1500 rpm and last 60 min, acidifying for 90 min, and the curing temperature under 50℃for 90 min.

优化配方及工艺条件为：聚丙烯酸钠和苯乙烯-马来酸酐按4：1混合作乳化剂，1500rpm搅拌，分散乳化60min，酸化90min，50℃固化90min作为制备二甲戊乐灵微胶囊的优化工艺条件，在此条件下可以得到平均粒径为9.6μm、粒度分布均匀、包封率在99%以上的球形微胶囊。

Compounds 3a-3d, 4a-4d, 5a-5d, 6a-6e and 7a-7e were prepared with a new efficient method, in which the aromatic amines were diazotized with isoamyl nitrite in EtONa/EtOH under refluxing condition, and mono -, bis -and tetrakis -substituted calix [4] arenes were obtained respectively as main product by diazo-coupling in different molar ratio to calix [4] arene.

一，提出了一个有效的新方法合成含有芳香偶氮基团的杯[4]芳烃衍生物3a-3d；4a-4d；5a-5d；6a-6e和7a-7e：即在非水溶剂乙醇中用亚硝酸异戊酯，在强碱乙醇钠存在下对芳香胺进行重氮化，得到芳香重氮酸盐沉淀，过滤，然后加入杯[4]芳烃的四氢呋喃溶液，通入CO〓气体调节溶液的pH值为7-9，使其发生偶联反应。

In this thermodynamic study, the minimum requirements in molar fraction of the solvents (x3) on the azeotropic feed plate are: 0.20 for N,N-dimethylformamide, 0.36 for 2-ethoxyethanol, 0.40 for 1-pentanol and 0.66 for butyl propionate,.

在这个热力学研究中，共沸混合物喂料盘上各溶剂摩尔分数最小值(x3)分别是：N，N-二甲基甲酰胺：0.20；2-乙氧基乙醇：0.36；1-戊醇：0.40；丙酸丁酯：0.66。

The People's Hospital of Xinhui, Guangdong Xinhui 529100, ChinaAbstract: Objective: Discussion on disinfection efficacy, time and safety for gastroscopy by ultramicro-soft acidification water and 2% glutaraldehyde in the same four flumes.

目的：探讨超微软酸化水四槽法和2%戊二醛四槽法对胃镜消毒效果、消毒时间及其安全性。

Results 65.3 % enzyme activity of IGAD could be reserved compared with unimmobilized one when the concentration of sodium alginate, gelatin, CaCl2, glutaraldehyde and solidifying time were 2.5%, 1.0%, 3.0%, 0.3% and 4 h respectively.

结果 海藻酸钠、明胶、氯化钙和戊二醛浓度分别为2.5%，1.0%，3.0%和0.3%，硬化时间4h，固定化酶的相对活性最高，酶活回收率达到65.3%。

Results:Methyl aldehyde can"t preserves efficiently the ultrastructure of the renal biopsies.Osmium tetroxide can preserves efficiently it but affects dyeing of the section for light microscopy.However,glutraldehyde not only preserves it better than methyl aldehyde but also doesn"t affect dyeing of the section for light microscopy.

结果：甲醛固定不能有效保存肾穿组织的超微结构，锇酸的固定能有效地保存超微结构，但严重影响了光镜切片的染色；而戊二醛与甲醛相比，较好地保存了肾穿组织的超微结构，同时又不影响光镜切片的染色。

The chemical constituents of walnut shell were systematically studied.

对核桃壳的化学组分研究表明：核桃壳的主要组分是木素、纤维素和半纤维素，与其他植物相比，冷、热水抽出物，1%NaOH抽出物，酸不溶木素含量均较高，纤维素含量明显较低，多戊聚糖含量与阔叶材相近。

Keywords alkyd modified t-octylphenolic resin;pentaerythritol;linseed oil;rosin;octylphenolic resin;rotary printing ink

醇酸改性辛基酚醛树脂；季戊四醇；亚麻油；松香；辛基酚醛树脂；轮转油墨

ABSTRACT:Objective To evaluate the effects of tannic acid treatment on the physico-chemical properties of glutaraldehyde-fixed bovine jugular vein.

目的 评估丹宁酸改性处理对戊二醛固定牛颈静脉管道理化性质的影响。

The X-ray diffract was used to analyze the crystal structure of the composite. Results show that after the talc was treated with blend coupling agent, the crystal structure of talc changed, and effect Intercalation phenomenon.

通过X射线衍射分析可知，用混合偶联剂对滑石粉进行预处理后，滑石粉晶体结构发生改变，产生了插层现象，使PP／滑石粉复合材料为纳米复合材料。

An authentic Maui wedding might require the services of a 'kahu', which is a Hawaiian minister.

毛伊可能需要一个真实婚礼服务'kahu'，这是夏威夷部长。