获得物

In the third step, when the ratio of racemic ester to benzenesulfonyl chloride to triethylamine to catalyst 4-DMAP is 1:1:1:0.1 in 10℃, the yield is 82.9% and high purity is obtained by crystallisation.

在第三步磺酰化反应中，得到合成消旋2-苯磺酸基-2(2-氯苯基)乙酸甲酯的较佳反应条件为邻氯扁桃酸甲酯：苯磺酰氯：三乙胺=1：1：1，催化剂4-DMAP用量为摩尔反应物的10%，反应温度为10℃，收率为82.9%，同时用结晶方法获得高纯度的产物。

The QSAR model of multiple descriptors was established by the above parameters and the parameters of ...

在分类建模的基础上，又获得了仅包含1XV和EHOMO两个参数的55种取代苯系物的定量结构-活性相关模式。

The compound tray holds excellent features , it has been successfully used in industry namely , methane alcohol ethanol , methyl aeetyl distillations and etc It is also expected to have a broad prospect for applications in other chemical industry field In this paper , many studies are concerned with the gas liquid duallowing the hole and oscillating regulation of the compound tray by experiments These studies will provide theoretical and experimental foundation for the design and improvement of the compound tray The main part of which is a 500 mm inner diameter three compound trays column , serving as a hydrodynamic model , the system air ?

复合塔板以其优良的性能，在甲醇、乙醇和丙酮等生产精馏装置中获得了成功的应用，并在其它化工生产领域有着广泛的应用前景。本论文旨在通过实验研究复合塔板上气液穿孔流动及波动波动规律，为复合塔的设计和结构改进提供理论和实验依据。实验是在一塔径500mm的冷模塔内，以空气—水为物系，在常压下进行实验。

To obtain the VPg gene of PRSV-W, the VPg gene of PRSV-P was modified into a VPg gene of PRSV-W by long primer extension and overlap extension PCR.

以此为基础，利用长引物延伸和套叠PCR的方法，定点突变剩余5个位点，最后拼接获得W型PRSV-VPg基因。

Four repeatably differential expression fragments were reclaimed from the polyacrylamide gels, re-amplified, cloned and sequenced.

获得5对能够扩增出5条对小麦抗叶锈病近等基因系TcLr41具有特异性条带的引物，分别是P-AC/M-CAA、P-AG/M-CAT、P-AG/M-CCC、P-CC/M-CCA、P-GA/M-CAA。

According to the orthogonal experimental design, the optimum hydrolysis condition of porcine hemoglobin by combinative enzyme treatment are as foll...

通过正交实验，确定复合酶水解的最佳工艺条件为底物浓度10%、加酶比例3∶7、pH7.5、水解温度50℃、酶浓度8000U/g、水解10h，在此条件下获得的水解率为19.1%。

The apxⅢA gene of Actinobacillus pleuropneumonie was amplified by PCR. The amplified DNA fragment 3 466bp was cloned into pMD18-T. After R.E. analysis and sequencing, the apxⅢA gene in pMD18-T was ligated into pBluescripⅡSK, the recombinant expression plasmid pET-28b/apxⅢA was constructed and analysed with R.E., the protein of apxⅢA gene expressed in E.coli BL21 was detected by Western blotting.

因胸膜肺炎放线杆菌的致病性主要是由毒素决定的，故参照猪胸膜肺炎放线杆血清2型菌株的序列(GenBankL1 2 1 4 5)设计了一对特异性引物，用PCR的方法扩增apxⅢA基因并得到了长 3 466bp的片段，然后将其克隆到pMD 1 8T中，经酶切鉴定和序列分析表明克隆是成功的；再将apxⅢA插入到原核表达载体pET 2 8b后，转化BL2 1 (DE3)，在IPTG诱导下获得高效表达，经Westernblotting检测证实表达产物有活性。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。