儿茶酚

Purpose To study the electrochemical behavior of catechol at poly modified electrode and to establish a voltammetric method for the determination of catechol.

目的 研究儿茶酚在聚刚果红修饰电极上的电化学行为，建立儿茶酚的伏安测定方法。

PurposeTo study the electrochemical behavior of catechol at poly modified electrode and to establish a voltammetric method for the determination of catechol .

目的研究儿茶酚在聚刚果红修饰电极上的电化学行为，建立儿茶酚的伏安测定方法。

Effects of Tea Catechins, Epigallocatechin, Gallocatechin, and Gallocatechin Gallate, on Bone Metabolism

茶中的儿茶酚：表没食子儿茶素，没食子儿茶酸和没食子儿茶酸没食子酸盐对骨代谢的作用。

The effect of aqueous ethanol (50% v/v) on the activity of purified mushroom polyphenol oxidase has been found to be as follows:(1)The oxidation of catechol or pyrogallol is greatly stimulated,an increase in the rate of oxygen uptake of over 100% having been invariably observed with catechol as the substrate,whereas the oxidation of other substituted o-dihydric phenols is inhibited in 50% ethanol.

三无论有无抗坏血酸的存在，50%乙醇对多酚氧化酶活力的提高程度是一样的，在有一定量的抗坏血酸的存在下，多酚氧化酶对儿茶酚的 Michaelis 常数(25℃)在水溶液及50%乙醇溶液中各为0.072×10~(-3)M 及0.49×10~(-3)M。

Therefore this research is to synthesize alkyl dialkyl o-hydroxyphenyl phosphate (8) as new lubricant additives.

所以本研究希望能结合磷酸酯与儿茶酚二者的优点以开发出新型态的润滑油添加剂---儿茶酚磷酸酯衍生物。

In chapter 6, a simple and rapid method for the simultaneous determination of three water-soluble compounds,β(3, 4-dihydroxyphenyl) lactic acid, protocatechuic acid and protocatechuic aldehyde, in radix Salviae Miltiorrhiza injection was firstly developed.

在第六章，我们首次建立了一种简单的、快速的同时测定丹参注射液中三种水溶性化合物丹参素、原儿茶酚和原儿茶醛的毛细管区带电泳法。

The volume of stimulant amino acid in the hypothalamic tuberal part of rat is dcreased,the volume of rejective amimo acid increased,the volume of Catecholamines drceased,the volume of the stimulant amino acid in spinal cord intermediolateralis,the rate of stimulant amino acid and rejective amimo acid,and the volume of Catechomamones dcreased,the volume of NE in spleen tissue dcreased,all of which means the irritability of sympathetic nervous circulus in spleen is restrained.

运动组大鼠下丘脑结节部兴奋性氨基酸含量下降，抑制性氨基酸含量上升，儿茶酚胺含量下降，脊髓中间外侧柱兴奋性氨基酸含量下降、兴奋性氨基酸/抑制性氨基酸下降、儿茶酚胺含量降低，脾组织内NE含量降低，提示有氧运动组大鼠的脾脏交感神经调节通路的兴奋性受到抑制。

The results showed that (1) all the arteries tested had tachyphylaxis to peptidergic agonists;(2) the desensitization of the arteries tested to catecholamines was uneasy except BA;(3) the desensitizations to AⅡ, AVP and PE were homologous;(4) the endothelium-EDRF -cGMP pathway had no contribution to the tachyphylaxis of PA to AⅡ and AVP;(5) membrane receptor cycling (internaliation and re-insertion) contributed only in part to homologous desensitization;(6) there was no change in the function of voltage-dependent Ca〓 channel during desensitization to AⅡ and AVP;(7) some changes in G protein occurred during homologous desensitization;(8) the most surprising finding was that the caudal arterial smooth muscle of stroke-prone spontaneously hypertensive rat showed tachyphylaxis to α〓-adrenoceptor agonist PE, while the tachyphylaxis of pulmonary artery of SHR was not changed compared with that of Wistar rat.

脱敏是消除效应的一种有效方式。因此，研究不同血管对不同激动剂脱敏的差异及阐明脱敏的机制，有助于阐明血管活动个性化的机制。研究表明：血管对肽类激动剂的脱敏方式为快速脱敏，而对儿茶酚胺类激动剂不易脱敏；血管对肽类激动剂和儿茶酚胺类激动剂表现为同源脱敏；内皮-NO-cGMP通路不参与肺动脉对AⅡ和AVP的快速脱敏；用PAO抑制膜受体的内在化只能短暂抑制脱敏的发展，提示用膜受体数目的下调说不能完全解释同源脱敏；血管对AⅡ和AVP脱敏后VSMC细胞膜电压依赖性钙通道功能无改变；CA对AVP脱敏后GTPγS的量-效曲线下移，说明有G蛋白的变化，但这种变化并非G蛋白的亲和性改变；SHRsp之CA平滑肌对AⅡ和AVP的快速脱敏并未减弱，但对PE却表现为快速脱敏，这是我们首次发现的一个非常有趣的现象。

Results: Epinephrine significantly increased the lipid peroxidation of erythrocyte membrane up to 19%（P〈 0.05）, however, noradrenalin had little effect.

观察儿茶酚胺自氧化对红细胞的过氧化作用，并以乙肝病毒表面抗体为代表靶，观察儿茶酚胺自氧化对抗体活性的影响。

Changes of contents of phenolic compounds (catechin, quercetin, chlorogenic acid, ferulic acid) and indoleacetic acid, and changes of activities of polyphenoloxidase and peroxydase during the cuttings rooting were determined.

蛇足石杉分别扦插于原生境土壤和灭菌土壤上，调查其生根率，测定生根过程中吲哚乙酸、酚类化合物(儿茶酚、槲皮素、绿原酸、阿魏酸)、多酚氧化酶和过氧化物酶活性的变化。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。