磺酸

Alkyl diphenyl ether disulfonate is a serie of anionic surfactants with many functions. It has two hydrophilic head groups and different from conventional surfactants.

烷基二苯醚二磺酸钠是一类在结构和性能上有别于传统表面活性剂的多功能性双亲水基型阴离子表面活性剂，具有卓越的表面化学性能及应用性能。

Alkyl diphenyl ether sodium disulfonateis a kind of multifunctional anionic surfactants with double hydrophilic groups.

烷基二苯醚双磺酸钠是一类当前备受瞩目的新型多功能双亲水基型阴离子表面活性剂。

A series of alkyl diphenyl ether were synthesized with low cost raw materials,diphenyl ether and aliphatic alcohol,catalyzed by concentrated sulfuric acid,and followed by sulfonation to produce MADS.On the basis of analysis and characterization,structure of the products was identified,effect factors of the preparation reactions were investigated and the optimum reaction conditions were obtained.2.The surface chemical properties of C_8,C_9,C_(10)-MADS were determined.

通过对产物的表征分析，对其结构进行了鉴定，并对合成反应的影响因素进行了分析讨论，优化了合成条件。2、测定了所合成的系列烷基二苯醚双磺酸钠C_8-MADS，C_9-MADS，C_(16-MADS的表面化学性能，结果表明：合成样品在质量分数高达10%的无机酸、无机碱及无机盐溶液中表面化学性能稳定，同时显示出优良的乳化性能和在硬水条件下较好的去污洗涤性能。3。

7-Hydroxy-4-methylcoumarin was synthesized from ethyl acetoacetate and m-dihydroxybenzene by the Pechmann condensation using phenyl sulfonic acid as catalyst under solvent-free conditions.

摘 要：以苯磺酸作催化剂，乙酰乙酸乙酯和间苯二酚为原料，通过Pechmann缩合反应合成7-羟基-4-甲基香豆素。

The sodium dodecyl sulfate eletrophoresis pattern of proteins showed that 32Kd, 36Kd and 41Kd proteins were rich synthesized in the NaCl-tolerant cell line and the corresponding bands strengthened. Abore all, the 38Kd protein band is a specific band of the NaCl-tolerant cell line.

耐盐系和对照系可溶性蛋白质的十二烷基磺酸钠电泳图谱表明：耐盐系中32Kd，36Kd和41Kd蛋白质合成加强，并且在38Kd蛋白质处出现了所特有的带。

Cellulose acetates with different substitution degrees were synthesized with wood pulp as raw material and dodecylbenzenesulfonic acid as catalyst.

以木浆为纤维素原料、十二烷基苯磺酸为催化剂，制备了一系列不同取代度的纤维素醋酸酯。

The characteristic property applying the matter absorption spectrum , thing optics characteristic property having studied crystal is purple under different condition and the purple ion that anionic surfactants twelve alkyls mahogany acid sodium forms association.

应用物质的吸收光谱特性，研究了不同的条件下结晶紫与阴离子表面活性剂十二烷基磺酸钠形成的紫色离子缔合物的光学特性。

Papain was modified using different anhydrides. The average ratio of modified-NH2 was tested by a trinitrobenzenesulfonic acid method. The native and modified papain samples were purified by dialysis and their structures were characterized by UV and IR.

用不同酸酐对木瓜蛋白酶进行化学修饰，以三硝基苯磺酸法测定修饰酶的平均氨基修饰度，对修饰前后的木瓜蛋白酶分别纯化并通过UV-vis和IR对其结构进行了表征。

MethodsAfter treated with DSS,the characteristics of isolated right atriums were investigated, including autorhythmicity,contraction scale,contraction velocity and relaxation speed.

目的研究3'大豆苷元磺酸钠对豚鼠离体右心房自律性及收缩特性的影响，并探讨其作用机制。

ResultsThe autorhythmicity of the isolated right atriums were inhibited after treated with DSS.

方法采用豚鼠离体右心房测定3'大豆苷元磺酸钠对其自律性、收缩幅度、收缩速度、舒张速度的影响。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。