酸性

Use nitrite and the Sulfanilic acid diazotization in acidic conditions,with dinitroaniline coupling formation color reaction,established the method of using the color reaction Determination Chinese cabbage s Nitrite content.

在酸性条件下亚硝酸盐与对氨基苯磺酸重氮化后，再与盐酸萘乙二胺偶合形成颜色反应，建立了用比色法测定大白菜中亚硝酸盐的方法。

The conversion of methanol is higher than 98% and the selectivity of dimethylamine is higher than 62% at 320～340 ℃ and 1.8～2.0 MPa.

目前 ，工业上用于甲醇气相氨化制备甲胺的催化剂是具有脱水和氨化作用的酸性催化剂，如γ-Al2 O3、硅酸铝、氧化钍等。

Diphenylbenzidine was synthesized by diphenylamine using glacial acetic acid and water as solvent in acidic condition.

摘 要：以二苯胺为原料，水和冰醋酸为溶剂，在酸性条件下一步合成二苯基联苯二胺，该方法具有操作简单，原料易得等优点。

Diphenylamine has been found to be an excellent coupling agent for the identification of aromatic amines.

本文推荐了二苯胺作为鉴芳胺化合物的偶合剂，其优于β-萘酚之点在于在酸性介质中即可偶合，试剂稳定便于貯藏，尚可进一步进行酸硷颜色变化试验及氧化还原颜色变化试验。

In the presence of the combination of sulphuric and phosphoric acid, with sodium diphenylamine sulfonate as the indicator, standard solution of potassium dichromate was used to titrate total iron value.

试样以盐酸溶解后，在酸性介质中，先以氯化亚锡将三价铁大部分还原为二价，然后在钨酸钠指示下，再以三氯化钛将剩余的三价铁还原为二价，过量的三氯化钛以重铬酸钾氧化消除干扰，在硫磷混合酸存在下，以二苯胺磺酸钠为指示剂，用重铬酸钾标准溶液滴定全铁量。

RESULTSdiabetic rats showed typical symptoms involving elevated serum glucose and weight loss (2)The rats in DM+VaD group reacted slower and made more error numbers in Y-maze than the rats in VaD group did, with a prolonged total reacting time in a whole day.(3)More neurons with serious damages, such as edema, ischemia or pyknosis could be found in DM+VaD group than in VaD group. More disarrangement of cone neurons, obvious glia proliferation, and more neuron apoptosis were found in CA area of hippocampus. CONCLUSIONS (1)2-VO in STZ-induced diabetic rats succeeded in establishing VaD animal models.(2) The cognitive dysfunction induced by VaD rats had been deteriorated by diabetes mellitus.(3)Morphology evidences proved that diabetes mellitus aggravated brain damages induced by VaD.PART II Effect of diabetes mellitus on the cholinergic nervous systemin CA1 area of hippocampus of VaDOBJECTIVE To estimate the role of cholinergic nervous system in hippocampus during the process of cognitive dysfunction aggravated by diabetes mellitus in DM+VaD group. METHODS Observe the changes of ChAT protein by immunohistochemistry stain. Chose three rats randomly from each group at each pointat two week, four week, and eight week, then sepa

经腹腔注射链脲佐菌素诱导慢性实验性糖尿病，1周后永久性结扎双侧颈总动脉(2-VO)制作VaD模型记录术后2周、4周和8周各组大鼠的体重及血糖；应用Y-迷宫检测空间定向学第二军医大学博士论文中…丈摘…要1ia；一色恤~﹁染澎糕行HE染色观察组织病理学孪叱；胶质细胞原纤维酸性蛋白protellZ，Cf冰尸标记观察星形胶质细舱的激活情况、橄声软公点娜育票票众糯黑橄居端粗默孺篇筑价井袱第二部分糖尿病对血管性痴呆大鼠海马c心区胆碱能神经系统的影响探讨海马CAI区胆碱能神经系统在糖尿病加重确D一大鼠认知障碍中所实验动物及分组同第一部分，应用免疫组织化学染色方法现察海马CAI{介狱牛第晕军l袭拔常博粗{论义

The characteristic and the pretreatment of molasses alcohol wastewater were studied. The results were as follows:(1) The wastewater was a high concentration and acid waste liquid. Some organic components of which polymerized above the temperature of 110℃,and some discomposed and formed charcoal when the temperature reached about 167℃.We couldn't find the polymeric compound or charcoal formed above the temperature of 240℃ in the present of oxygen.

对糖蜜酒精废液的特征进行了分析并对废液的预处理方法进行了研究，结果表明：（1）废液是一种高浓度的酸性有机废水，其在110℃时开始有部分有机物发生聚合，在约167℃左右开始有部分分解而析出炭，有氧气存在时，240℃以上的温度下观察不到聚合物或炭的析出。

Since the dismutation of superoxide radicals by SOD is a reaction that is rate-limited by diffusion and enhanced by electrostatic guidance, all these structural features may be related to GP-MnSOD's high catalytic activity: first, Lys38 may increase the effective enzyme-substrate association rate by enhancing the electrostatic gradient at its substrate channel; second, an excess of acidic over basic residues makes the negative surface potential of GP-MnSOD more larger than those of other known MnSODs. This may enhance the reaction rate by reducing futile collisions of superoxide radicals with GP-MnSOD's surface.

因此，GP-MnSOD的上述结构特征可能与GP-MnSOD的较高酶活有关：首先，Lys38增加了底物通道口的正静电势梯度，从而可能促进了GP-MnSOD的活性中心与底物的有效结合速率；其次，GP-MnSOD表面覆盖的过量酸性残基使得它比其它MnSOD在底物通道以外的蛋白表面更多地被负静电势所覆盖，这可能有效地减少了超氧阴离子与GP-MnSOD表面的无效碰撞，从而提高了反应速率。

The catalysts are arranged in the order of their acidities as reflected in the amount of the disproportionation and skeletal isomerization products.

依不均衡反应及骨架异构化反应之产物的量，可把触媒按照其酸性程度排列。

Its acidic dissociation constant at ground and excited state are determined based on the changes of the absorption and fluorescence spectra in the water.

基于不同pH值水溶液中吸收和荧光光谱的变化，计算得该试剂基态和激发态分子的酸性常数（pKa＝ 8.84， pKa＝ 5.11）。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。