反应率

The factors affect on the degree of substitution of product, yield and apparent viscosity, such as the mol rates of EPTAC with -NH2, reaction temperature, reaction time and the content of water in system have been discussed in detail. FTIR spectrometer and UV spectrometer are used to characterize the structure of the derivative and it is proved that substitution reaction mainly occurs on the -N element .The particle size and morphology of chitosan and quantemary ammonium salt of chitosan are analysised by comparing photos of their scanning electron microscope. The degree of substitution of HACC is determined by acid -base conductometric titration. An error in current formula of DS has pointed out and a correct formula has presented.On the base of experience of above experiment, the reaction conditions of HACC were systematically investigated through orthogonal design, and then the best conditions are found. Water-solubility and dependence of pH are studied.

壳聚糖和环氧丙基三甲基氯化铵在异相条件下发生反应，通过单因素实验，制备了一系列不同性能的壳聚糖季铵盐，本文首次详细讨论了反应条件(反应摩尔比、反应时间、反应温度、水含量)对产率及产物性能的影响；用红外光谱和核磁共振对结构进行表征分析时，发现季铵盐阳离子基以N位上取代为主；通过电镜图片对壳聚糖和季铵盐衍生物外观形貌进行对比，采用酸碱电导滴定法测定产物的取代度，并对常用取代度公式做了修正。

Catalyzed by KF-Al2O3, Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate under microwave irradiation without solvent has been found to proceed with high yield.

采用KF-Al2O3为催化剂，在无溶剂微波辐射下苯甲醛与氰基乙酸乙酯发生 Knoevenagel 缩合反应，得到了较高的产率，并考察了反应条件对产率的影响。

Experimental results indicate that the reduction of chemical oxygen demand were 40%, 38%, 12%, 50%, and 73% for β-naphtho1, salt R, dihydroxy salt R, acid red, and wastewater, respectively when the reactions had run for 4 h at a pH of 1.7. In comparison, the COD reduction of-naphtho1 and salt R were 10.2% and 16.2%, lower than 23.4% and 18.1% with H2O2, while the Fenton reaction time was 1 h.

当pH=1.7、反应4h时，β-萘酚、R盐、二羟基R盐、酸性红、实际废水的化学需氧量去除率分别可达40%、38%、12%、50%和73%；对比实验显示，反应时间为1h时，β-萘酚和R盐的COD去除率分别为10.2%和16.2%，而用H2O2则分别为23.4%和18.1%。

The results showed that 1,5-naphthalene disulfonic acid could be degradated effectively by the catalytic supercritical wa...

结果表明，催化超临界水氧化技术能有效地降解1，5-萘二磺酸，COD去除率可达98%以上；随着反应温度的升高，停留时间的延长，COD去除率也提高；1，5-萘二磺酸在超临界水中催化氧化降解反应的级数对COD和氧气分别为0.89和0.28，活化能为56.8 kJ/mol。

RESULTS After using EOW and glutaraldehyde to disinfect the gastroscope and enteroscope the...

结果EOW消毒胃、肠镜对常见病原菌1min杀灭率为93.75%~98.22%、3min为99.30%~99.95%、5min为100.00%；戊二醛消毒胃、肠镜3min杀灭率为81.20%~89.29%、5min为90.38%~93.04%1、0min为99.92%~99.96%；EOW对人体无过敏反应和黏膜刺激，但稳定性差；而戊二醛对人体均有黏膜刺激和个别过敏反应。

Of 232 persons,eleven have abnormal shadows in their lungs ;one has lymphadenectasis ;sputum smear acld-fast strain and cultivate were negative ;serum and antitubercle antibody was positive.

来自城镇地区学生的PPD反应阳性率为55.03％，明显高于来自农村地区的学生42.78％（u=7.66，P（o.01），大学生结核病的发现率为0.18％；农民工的PPD反应阳性率55.81％，结核病的发现率0.53％。

After 6-12 months, the therapeutic effect of albendazole was estimated in subcutaneous-muscular cases by the number of subcutaneous nodules, the activity and the morphological change of larvae in cerebral cases by the neuropsychic symptoms, CSF changes, CT fi...

结果皮下肌肉型患者的治愈率为64％，显效率为25.6％，改善率为10.4％：脑型患者治愈率为40.6％，显效率为44％，改善率为15.4％。不良反应较少，较轻，未发现无效病例及因副反应而中止疗程者。

The behavioral responses of sea cucumber to different light intensity (100, 50, 10, 5, and 1 lx) and settlement substratum color (red, gray, yellow, blue, white, black, and green) were examined by mean phototactic rate and mean attractive rate methods. The results showed that the MPR was significantly different (P.05) among strong light regions (100, 50, and 10 lx)(P.05), but was not between weak ones (5 and 1 lx).

为了探讨刺参的趋光特性和附着基颜色对其行为反应的影响，分别用平均趋光率(mean phototactic rate， MPR)和平均聚集率(mean atteactive rate， MAR)统计分析了刺参在100、50、10、5和1 lx共5档强度的光照和7种颜色的附着基（红色、灰色、黄色、蓝色、白色、黑色和绿色）下的行为反应差异。

Substrate concentration, and enzyme content of 4 to 6 u/g chitosan, respectively. Enzymatic reaction could be stopped by adjusting pH to 8. 0 with 2. 0mol/L NaOH, when transmittancy reached 78% in wave length of 600nm.

采用NaOH溶液调pH至8左右，在波长600nm下测其透光率，当透光率达到78％左右，即可终止酶解反应，该方法可方便、快速和准确地控制酶解反应。

The phosphorus oxychloride or phosphorus tribromide N, N-dimethylformamide mix and react to form the Vilsmeier reagent used in the reaction. The newly prepared Vilsmeier reagent is added into the reaction bottle provided with the return condenser and the blender; a reaction raw material N, N-dimethylformamide solution expressed in the reaction formula is added into the system; the temperature is risen; the corresponding multi substituting pyridine-2 (1 H)-ketone compound can be made after the column chromatography of the silica gel; the production rate is between 60 and 95 percent according to different reactions.

由三氯氧磷或三溴化磷N，N-二甲基甲酰胺混合获得反应中所用Vilsmeier试剂；将新配制的Vilsmeier试剂加入装有回流冷凝管、搅拌器的反应瓶中，向体系中加入反应通式中表示的一种反应原料的N，N-二甲基甲酰胺溶液，升温，经硅胶柱层析分离得相应的多取代吡啶-2(1H)-酮类化合物，产率视不同反应在60~95％之间。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。