二酸

In this paper, the applications of the environmental friendly solid acid catalysts for esterification were studied and the activities of these catalysts were discussed, by which the solid acid ferric sulfate x-hydrate was used first as catalyst in the synthesis of dimethyl fumarate and ethyl chloroacetate and solid super acid SO42-/Fe2O3 was used first as catalyst in the synthesis of ethyl p-nitrobenzoate.

本文研究了对环境友好的固体酸催化剂在酯化反应中的应用，首次以固体酸Fe_2(SO_4)_3·xH_2O为催化剂合成了新型防霉剂富马酸二甲酯和化工原料氯乙酸乙酯，以固体超强酸5O_4~(2-)／Fe_2O_3为催化剂合成了医药中间体对硝基苯甲酸乙酯，并探讨了这些催化剂的催化活性。

A series of 2-oxocyclododecyl sulfonylurea s have been synthesized from 2-oxocyclododecylsulfonamide via acylation of phenyl chloroformate and amination.

以环十二酮为起始原料，经磺化反应制备得到2-氧代环十二烷基磺酸盐B，B经过氯化和胺解反应制备得到2-氧代环十二烷基磺酰胺C，C经过苯氧酰化与胺解反应后合成了10个新的2-氧代环十二烷基磺酰脲类化合物D，它们的结构通过了1HNMR和IR的确证。

Synthesis process of 2,6-dichloro-3-methylaniline was investigated 3-methylaniline was first N-acetylated with acetic anhydride,then treated with chlorosulphonic acid and ammonia yielding the 2-methyl-4--benzenesulfonic amide,which wasin turn deacetylated,chlorinated and hydrolyzed to the title compound.Hydrochloric acid was used instead of sodium hydroxide in deacetylation and sodium chlorate instead of hydrogen peroxide as oxidant in chlorination.

合成工艺2，6-二氯-3-甲基苯胺调查3-甲基首次N-乙酰与醋酸酐，然后与氯磺酸和氨产量 2-甲基-4--苯磺酰胺基，而擅转乙酰，氯化和水解的标题compound.hydrochloric酸代替氢氧化钠乙酰氯酸钠代替双氧水为氧化剂，加氯。

The reaction between 3, 4 cinnamic acid and 〓 has also been investigated as an evidence for the electron transfer mechanism.

以〓为过氧自由基模型，研究了羟基肉桂酸衍生物对该自由基的清除作用，发现这类化合物，特别是芥子酸，能够通过电子转移反应有效地还原过氧自由基。3，4-亚甲二氧基肉桂酸与〓的反应的动力学研究为电子转移机制提供了证据。

Metabolites, including 1 phenolic diterpene, 2 phenolic acids (rosmarinic acid and caffeic acid), 2 flavonoids (6-methoxyluteolin-7-glucoside and homoplantaginin) and 1 coumaric acid ( cis-4-glucosyloxycinnamic acid), were successfully identified from two rosemary extracts with chloroform-methanol ( v / v , 3/1) and 50% aqueous methanol on the basis of HPLC, UV, NMR and MS data.

基于高效液相色谱、紫外吸收、核磁共振波谱及质谱数据，具有代表性的6个迷迭香代谢物的结构得到了确定，它们分别为1个酚类二萜、2个酚酸、2个黄酮（6-甲氧基木樨草素-7-葡萄糖苷和高车前甙）和1个香豆酸(顺-4-香豆酸葡萄糖苷)。

Methods Myocardial ischemia was induced by subcutaneous injection of ISO (30 mg/kg for two days, once a day). The experimental animals were randomly divided into the normal group, ISO group, positive control group and three crocetin groups (25, 50, 100 mg/kg). Cardiac indexes were examined. The level of LDH, CK, MDA in serum were measured. The content of MDA, GSH-Px and the ATPase activity heart and mitochondria were assayed by colorimetric analysis. The histopathological change of myocardia was investigated by HE staining.

采用大剂量ISOsc诱导产生大鼠急性心肌缺血模型(1SO30mg／kg，每日一次，连续2d)，实验大鼠随机分为正常组、ISO模型组、阳性对照组和3个西红花酸给药组(25，50，100mg／kg)，测定心脏系数和血清中乳酸脱氢酶、磷酸肌酸激酶和丙二醛含量，观察心肌组织谷肮甘肤过氧化物酶、Na^ ，K^ —ATP酶和Ca^2 ，Mg^2 —ATP酶活性及心脏病理改变，观察西红花酸的保护作用。

Synthesis of dibutyrate nylon acids from nylon acids and butanol by the reaction of direct esterification and distillation under reduced pressure, using solid acid as catalyst.

尼龙酸在固体酸催化下，与丁醇直接酯化、减压蒸馏制得合格的尼龙酸二丁酯。

A production method of potassium dihydrogen phosphate includes the following steps: using phosphoric acid and potassium chloride to make them produce double decompositino reaction to produce potassium dihydric pyrophosphate and hydrogen chloride gas; hydrolizing potassium dihydri pyrophosphate to produce potassium dihydrogen phosphate; and the equipment used can solve the problems of mixed hydrochloric and phosphoric acids corrosion and expansion due to heating.

本发明公开了一种磷酸二氢钾的生产方法，其特征在于用磷酸与氯化钾进行复分解反应，生产焦磷酸二氢钾和氯化氢气体，焦磷酸二氢钾进行水解生产磷酸二氢钾，所用设备解决了盐酸、磷酸混酸腐蚀材质及加热造成的膨胀问题，本发明产品达到了磷酸与氢氧化钾中和法的质量，大幅度地节约了原材料的成本。

The free bile acid and dihydroxy bile acid glycine union(exisistence by the of non-ionic form ) also be absorb again through the simple proliferation way.this may occurs in any part of the small intestine and colon.

未结合的胆汁酸和二羟基胆汁酸的甘氨酸结合物，也过简单扩散的方式被重吸收。这种通过小肠膜的非离子化扩散可在小肠的任何部位及结肠发生。

Specificity studies on the substrate revealed that the HdPO was capable of oxidizing not only the o-diphenol, but also tyrosine. The apparent Km value on tyrosine was about 9.52 mmol/L. As shown in the experiments, HdPO behaved oxidizing activities both on diphenol and monophenol, which implies that the HdPO was probably not only a type of tyrosinase-type PO but also a catechol-type.

底物特异性研究还发现此HdPO不仅对邻苯二酚具有氧化活性，对酪氨酸底物也具有氧化活性，且对酪氨酸的Km值约为9.52mmol/L，说明该酶既具有酪氨酸酶活性，又具有儿茶酚酶活性。

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。