查询词典 para-aminobenzoic acid

It is shown that mixed tolyl arsonic acid was much superior to either para- or ortho-isomer alone for cassiterite flotation.

当混合比为45：55时，锡石产率出现"峰值"，可得到较高的浮选指标。

This process utilizing modern efficient wire gauze wave-like packings sepa-rates three isomers of MNT(ortho-.meta- or para-), then the O-MNT or P-MNTis nitrated to produce military TNT by a mixture of nitric and sulfuric acid.

本工艺利用近代高效的金属丝网波纹填料分离MNT的三种异构体，然后用硝硫混酸把邻一或对一MNT硝化成军品TNT，这样可避免亚硫酸钠溶液精制TNT的工序。

It is shown that mixed tolyl arsonic acid was much superior to either para- or ortho-isomer alone for cassiterite flotation.

当混合比为45：55时，锡石产率出现&峰值&，可得到较高的浮选指标。

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 optimum reaction conditions were: at present of acetic anhydride, a stoichiometric quantity of nitric acid, at room temperature for 40 minutes. Nitration of chlorobenzene gave a,50% yield of mononitro compounds, and an ortho-para isomer ratio 0.20 in product distribution of chlorobenzene mononitration.

结果表明：硅钨酸催化性能较好，催化剂载体以纳米二氧化硅最好，反应条件中醋酸酐用量是主要影响因素；SiW_(12)O_(40)~(4-)／纳米SiO_2催化剂具有强对位选择性：在醋酸酐存在下，氯苯与等当量的硝酸室温下反应40分钟，氯苯一硝化产物中邻／对硝基氯苯异构体的质量比达0.2，产率可达50％。

And the ability of antioxidant of polyhydroxy benzamides don't have too many differences with Trolox (IC50 =13.90 μg/ml), the substition of hydroxy group at amino benzene ring doesn't affect the whole ability of antioxidant apparently, but while the single hydroxy group at carboxylic acid benzene ring, they are apparently decrease to scavenge the ability of free radical, as a result, the hydroxy at amino benzene ring substitutes its function, without the hydroxy group, the ability of antioxidant is worst, but it upgrades its function while the hydroxy and amino are in the ortho-position or para-position.

而当多酚醯胺化合物其抗氧化能力与Trolox差不多时(IC50 =13.90 μg/ml)，胺基苯环上之羟基取代对整体抗氧化能力影响不明显，但在羧酸苯环上具单羟基时，其清除自由基能力明显下降，使得胺基苯环上羟基取代发挥了影响力，无羟基取代时，抗氧化能力最差，而羟基与胺基互为邻位或是对位时较间位有提升效果。

Four chalcones were synthesized by aldol condensation reaction of acetophenone or para-substituted acetophenones with 2-phenyl-1,2,3-triazol-4-carboxaldehyde, which reacted with three hydrazines in glacial acetic acid under refluxing to give a series of pyrazoline derivatives.

以2-苯基－1，2，3-三唑基－4-甲醛为原料，与苯乙酮［或取代苯乙酮(1a~1d)］发生羟醛缩合，生成相应的查尔酮(2a~2d)，再与不同的肼反应，合成了12种新的5位含2-苯基－1，2，3-三唑基的吡唑啉衍生物3a~3d，4a~4d，5a~5d。

The polycondensation of the benzoguanamine and pyromellitic Dianhydride was carried out under microwave irradiation, and the resulted polyamic acid was grafted with TDI-para position substitution aniline derivatives. Thus graft polymers with different electronic effect of the end group in side chain were obtained.

将微波辐射合成的苯代三聚氰胺-均苯四酸二酐体系的PAA与TDI-对位取代苯胺衍生物反应，通过改变TDI－对位取代苯胺衍生物的对位取代基来合成具有不同电子效应的侧链端基的接枝聚合物。

The osteogenic differentiation markers were determined by para position Nitrobenzene phosphoric acid and Alizarin Red S staining.The expressions of CBFA1 and VEGF mRNA in BMSCs were detected by RT-PCR.

采用改良MTT法测定含药血清对P2代BMSCs增殖的影响；用对硝基苯磷酸法和茜素红S染色定量法对BMSCs分化为成骨细胞的标志物进行测定。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。