查询词典 para

Therelative rates of the Rh-mediated carbenoid insertion into the benzylic C - H bonds of aseries of para-substituted phenyl substrates: methyl 2-diazo-3-oxo-6-(4-substituted phenyl)-4-propylhexanoate 47a - g, have been measured by an indirect intramolecular competitionmethod under the condition in which the possible steric and conformational effects have beenminimized.

为了将立体因素和构象因素最大程度减小，以便较为准确地评价电子效应对该反应的影响，设计并合成了不同对位取代基的化合物4-丙基-6-(4-取代苯基)-2-重氮基-3-氧代己酸甲酯47a-g，并研究了它们在不同Rh催化剂作用下的分子内C-H插入反应。

A salt of bromic acid.A white, odorless, tasteless crystalline ester, ethyl-para-aminobenzoate(C6H4NH2CO2C2H5), used as a local anesthetic.

苯坐卡因，对氨基苯酸乙酯一种白色、无嗅、无味的晶体酯，对位氨基苯甲酸乙酯，（c6h4nh2co2c2h5），用作局部麻醉剂

The para-selectivities of mononitration in aromatic compounds such as ethylbenzene, bromobenzene and iodobenzene increased by 18%, 15% and 16% respectively.

反应具有强对位选择硝化能力，乙苯、溴苯和碘苯的对位硝化比例分别提高18%、15%和16%。

It was observed that the optimum temperature for the fluorous biphasic regioselective nitrations of toluene, ethylbenzene, flurobenzene, chlorobenzene, bromobenzene, odobenzene and diphenyl ether were 80℃, 60℃, 60℃, 60℃, 80℃, 80℃ and 70℃ respectively. The catalyst had almost no activity when the reaction system contained 25% of water. Simultaneously, increasing the volume ratio of fluorous phase and organic phase in the system in which the fluorous phase can miscible with organic phase could decrease ortho-para ratio.

发现甲苯、乙苯、氟苯、氯苯、溴苯、碘苯加二苯醚的最佳氟两相选择性硝化温度分别为80℃、60℃、60℃、60℃、80℃、80℃和70℃，当加入25%的水时，催化剂已基本失去活性，在氟相和有机相能完全互溶的体系中升高氟相和有机相的体积比有利于降低邻对位比值。

Methods: mvc and expression of tgfβ1 in 50 carcinomatous specimens and expression of tgfβ1 in 35 para carcinomatous specimens from the same 50 cases with nsclc were detected by sp immunohistochemistry.

通过应用sp免疫组化方法检测50例nsclc组织内微血管计数及50例nsclc组织和35例癌旁组织中tgfβ1的表达。

The 9A-91 also served as a basis for a silenced "para-sniper" weapon, the VSK-94 , also chambered for 9 x 39 ammunition.

在第9A - 91也作为一个沉默&准狙击手&的武器的基础，是 VSK - 94，也为9 39弹药腔。

OH radicals produced by ultrasound in aqueous solution attack phenolic cycle at adjacent or para position of the hydroxyl on phenol so that phenol is changed into small organic molecules such as muconic acid, maleic acid and ethane diacid. These small organic molecules will be oxidized to form carbon dioxide and water by.

苯酚超声降解的作用机理是，超声空化在水溶液中产生的·OH自由基进攻苯酚苯环上羟基的邻位或对位而使苯环断裂生成己二烯酸、顺式丁烯二酸和乙二酸小分子有机物而使苯酚得以降解，这些小分子有机物在·OH自由基的进一步作用下最终被氧化成CO〓和H〓O。

The more the number of hydroxyl substitution in phenyl ring, the better the ability of scavenging DPPH free radical. That is, trihydroxy is better than dihydroxy, and dihydroxy is better than monohydroxy. Moreover, when the polyhydroxy exists in phenyl ring and it is ortho-position or para-position, the ability of scavenging DPPH free radical is better too.

当苯甲醯基的苯环上羟基取代数量越多，其清除DPPH自由基的能力越好，三羟基效果优於双羟基、单羟基，双羟基效果优於单羟基；而苯甲醯基苯环上若为多羟基且羟基的位置为邻位或对位的关系时，其在清除DPPH自由基的能力较佳。

For a disubstituted complex, MA4B2, the planar arrangement gives three isomers, the familiar ortho, meta, and para arrangement s of organic chemistry.

对于双取代络合物MA4B2，其平面排列有三个异构体，常见的为有机化学中的邻位、间位和对位排列。

For a disubstituted complex, MA4B2, the planar arrangement gives three isomers, the familiar ortho, meta, and para arrangements of organic chemistry.

对于双取代络合物 MA4B2，其平面排列有三个异构体，常见的为有机化学中的邻位、间位和对位排列。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。