查询词典 p-phthalic acid

A novel method for the synthesis of α-bromo acetophenone s by the reaction of 1,3-dibromo- 5,5-dimethylhydantoin with p-toluenesulfonic acid in methanol at 20～60 ℃ was described.

报道了使用1，3-二溴-5，5-二甲基海因和对甲苯磺酸在甲醇中和20～60℃的温和条件下合成α-溴代苯乙酮的新方法。

Two different deductions of equation for the pH calculation of buffer solutions are compared,and a new deduction method based on proton balance equation in acid-base equilibrium is proposed.

比较了两种缓冲溶液 p H值计算公式的推导方法，从酸碱平衡的 PBE出发，提出一种新的推导方法。

The latter was esterified with allyl alcohol in the presence of the catalyst toluene-p-sulfonic acid to get the title compound in the yield of 87.1%.

后者在对甲苯磺酸催化下与烯丙醇经酯化反应制得标题化合物，收率为87.1%。

First, nucleic acid sequence encoding ectodomain of AMAl was amplified from Pf genome and, was cloned into prokaryotic expression vector.

首先，自P.f基因组DNA中扩增出编码AMAl胞外域的基因片段，经测序确证后，克隆入原核表达载体。

The amidation of fatty acid with amine constructed the skeleton of malyngamide M,and then transformation of Z-olefin to E-olefin completed the synthesis of target molecule.

第4章详细阐述了使用高度会聚通用的路线完成含有末端烯氯结构的malyngamides O，P，Q，和R，以及Q和R的C-5差向异构体的全合成。

During the preparation we use terephthalic acid to take the place of isophalic acid.

介绍了用对苯二甲酸取代问苯二甲酸制备33－P 胶衣的工艺配方，对该胶表性能进行检测表明，该胶衣在耐热性、耐化学性和机械强度方面均优于市场上的33#胶衣。

8Ps for native and NaBH〓 chemically modified reaction centers, and the transfer process from H〓 to the final electron acceptor Q〓 occurs in about hundreds of picoseconds. On the other hand, the energy transfer from excited B was obviously slowed down in the pheophytin-exchanged RC. By considering the change of free energy of ion pair P〓Phe〓, it could be expected there might exist alternative pathway of charge separation and electron transfer in pigment-exchanged reaction center. In addition, the influence of acid environment on the ultrafast dynamics of reaction center was also experimentally observed, which shows an evident difference from that of in native RC, and further investigation should be carried out to elucidate the origination.

在色素置换后的反应中心中，以B为起点的能量传递较天然RC的情况明显减慢，约在450fs左右，考虑到置换后的反应中心中P的自由能有所提高以及其仍然保持的光化学活性，这一较慢的能量传递也可能预示着还存在着其它的能量传递通道；另外，还对酸性处理的反应中心中的超快光动力学过程进行了尝试性的研究，发现由于色素分子的聚集以及蛋白环境的改变，BChl分子的激发态动力学过程有着明显不同于天然反应中心的情况。

The pathological changes of liver tissues in rats were observed, and the liver function, serum leptin, insulin resistance index, triglyceride and free fatty acid in the liver were detected.

结果：各用药组的血清瘦素、胰岛素抵抗指数及肝匀浆FFA、TG含量均显著低于模型组（P.01），且化痰泄浊方组的抗脂肪肝作用显著优于东宝肝泰组（P.05）。

There exist Lewis base sites (M=O and M-O-M or M-O-P) and Lewis acid sites on the surface of these catalysts.

催化剂表面的活性基元由Lewis碱位M=O键的端氧和M-O-M或M-O-P键的桥氧位，Lewis酸位M〓组成。

The results showed that there existed Lewis base sites (M=O and M-O-Fe) and Lewis acid sites on the surface of these catalysts.

研究表明，Fe-V-O、Fe-Mo-O、Fe-P-O和Fe-Al-P-O催化剂表面活性基元都是由Lewis碱位（M=O键的端氧和M-O-Fe键的桥氧位）和Lewis酸位组成。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。