甲醇

Norbornene-2,3-dicarboxylic acid monomethyl ester was prepared by using 5-norbornene-2,3- anhydride and methanol as raw materials and toluene as solvent.

以5-降冰片烯-2，3-二酸酐和甲醇为原料，正交试验法合成了5-降冰片烯-2，3-二羧酸单甲酯，并对产物结构进行了表征。

The HPLC condition consisted of C18 column(250 mm×4.6 mm,5 μm),mobile phase of 0.1 mol/L monopotassium phosphate-methanol(70 : 30,v/v) at the flow rate of 1.0 mL/min and at detection wavelength 280 nm.

本法采用C18色谱柱，流动相为0.1mol/L磷酸二氢钾溶液(用磷酸调节pH值至2.5)-甲醇的混合溶液(按v∶v=70∶30配制)，检测波长为280nm，流速为1.0mL/min。

Therefore, the aim of this research is to compare the antioxidant, acetylcholinesterase-inhibiting and monoamine oxidase -inhibiting activities of these four parts of Morus alba. In addition, I also explored the mechanism of the ameliorating effects of scopoletin on the scopolamine induced memory impairment in rats.

因此，本研究针对桑四个药用部位之甲醇抽提物进行抗氧化活性及对乙醯胆碱酯酶、单胺氧化酶的抑制活性之分析比较，之后再探讨其香豆素类成分 scopoletin对 scopolamine 诱发大鼠记忆障碍之影响，及其改善作用机制。

Reactor Construction: Multitube reactor systems for chemical industry ( all technical heat transfer fluids,particularly mkoltensalt 50 years experience) for production of:phthalic anhydride,maleic anhydride,acrolein,methyl methacrylate,methanol,ethylene oxide and other endothermic and exothermic catalytic gasphase processes.

反应器制造部：列管反应器系统，用于化学工业(所有工业用热交换流体，特别是熔盐传热)中生产苯酐，顺酐，丙烯醛，丙烯酸，甲基丙烯酸甲酯，甲醇，环氧乙烷及其他放热与吸热气相催化生产工艺。

Reactor Construction: Multitube reactor systems for chemical industry ( all technical heat transfer fluids,particularly mkoltensalt 50 years experience) for production of:phthalic anhydride,maleic anhydride,acrolein,methyl methacrylate,methanol,ethylene oxide and other endothermic and exothermic catalytic

简介： 反应器制造部：列管反应器系统，用于化学工业（所有工业用热交换流体，特别是熔盐传热）中生产苯酐，顺酐，丙烯醛，丙烯酸，甲基丙烯酸甲酯，甲醇，环氧乙烷及其他放热与吸热气相催化生产工艺。

Water, methanol and ethyl acetate extraction method were used to extract non-oil components from Myrtus communis Linn. leaves, and then radical scavenging activity and antioxidant role of these extracts were investigated using four chemiluminescence systems and two colorimetric systems.

采用水提取法、甲醇－水提取法和乙酸乙酯提取法3种方法从香桃木叶中提取非精油组分，然后用4种化学发光体系和2种比色体系检测其清除自由基和抗氧化作用。

Result Extracts of Myrtus communis Linn.leaves not only effectively scavenged O2(superscript -), O H,DPPH and ONOO(superscript -), but reduced or prevented DNA oxidative damage caused by OH and inhibited lipided pexoxidation.

香桃木叶的非精油组分3种提取物均能有效清除O2、OH、DPPH和ONOO，减轻或消除OH对DNA的氧化损伤，抑制脂质过氧化，其中甲醇－水提取物清除O2和ONOO能力最强，乙酸乙酯提取物清除OH和DPPH的效果最佳。

METHODS:The content of the total naphthoquinone was counted in L-shikonin ,methanol was used as solvent and the wavelength was set at516nm.

总萘醌的含量以左旋紫草素计，溶剂为甲醇，检测波长为516nm。

The results show that the best second extraction condition for naringenin was as follows: 7:3 for concentration ratio of methanol and ethanol, 50 for temperature, 5 h for time, and 1:45 for stuff and liquor ratio.

通过实验确定了柚皮素的最佳二次提取条件为乙醇甲醇浓度比7：3、温度为50℃、时间为5h、料液比为1：45，采用分光光度法测得柚皮素平均得率为5.25%。

Fifteen novel 1,4-naphthoquinones, rhinacanthin-A -D, rhinacanone-A -K and two new biphenyl compounds, rhinacanim-A,-B together with eleven known compounds have been isolated and characterized from the root of Rhinacanthus nasutus Kurz.

从白鹤灵芝草的根部甲醇抽取物中经过各种层析分离纯化后共得到15种新的1，4-naphthoquinone类化合物，分别命名为Rhinacanthin-A至-D，Rhinacanone-A至-K及二种新的Biphenyl化合物，Rhinacanim-A，-B和11种已知化合物。

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。