黄嘌呤

Tea contains caffeine, theophylline, theobromine, xanthine alkaloids and other substances, is a good basic drinks.

茶叶中含有咖啡因，茶碱，可可碱，黄嘌呤等生物碱物质，是一个良好的基础饮料。

This class of substances includes caffeine and the related chemical theobromine.

巧克力由可可豆加工而成，含有多种甲基黄嘌呤的衍生物，咖啡因和可可碱就属于这类物质。

Methods Seven probe drugs were incubated with or without methyl protodioscin respectively in human microsomes. The specific substrates used in this study were caffeine (CYP1A2), dextromethorphan (CYP2D6), tolbutamide (CYP2C9),-mephenytoin (CYP2C19), chlorzoxazone (CYP2E1), coumarin (CYP2A6) and midazolam (CYP3A4). The concentrations of the substrate metabolites (paraxanthine, dextrorphan, 4-hydroxytolbutamide, 4-hydroxymephenytoin, 6-hydroxychlor-zoxazone, 7-hydroxycoumarin and 1-hydroxymidazolam) were determined by HPLC and LC-MS/MS. Results MPD 1-10 μmolL^(-1 had no significant inhibition on the activities of the seven cytochrome P450 enzymes.

将MPD和CYP450酶7种亚型的特异性探针底物咖啡因(CYP1A2)、右美沙芬(CYP2D6)、甲苯磺丁脲(CYP2C9)、s-美芬妥因(CYP2C19)、氯唑沙宗(CYP2E1)、香豆素(CYP2A6)及咪达唑仑(CYP3A4)与人肝微粒体进行孵化反应，采用HPLC和LC-MS/MS法测定对应的7种代谢产物（1，7-二甲基黄嘌呤、去甲右美沙芬、4-羟基甲苯磺丁脲、4-羟基美芬妥因、6-羟基氯唑沙宗、7-羟基香豆素和1-羟基咪达唑仑）的浓度，通过与对照组比较，确定MPD对以上7种酶活性的影响。

Tungstate competitively inhibits the utilization of molybdenum for the formation of xanthine dehydrogenases.

钨酸盐竞争性地抑制钼的利用以形成黄嘌呤脱氢酶。

Methods:The levels of plasma ET,serum malondial dehyde and super-oxide dismutase were measured by the methods of nalysis of radioimmunoassay,thiobarbiturate and xanthin oxidasein the blood samples from 68 patients with APP,and 29 normal controls.

采用放射免疫分析法、硫代巴比妥酸法及黄嘌呤氧化酶法测定68例APP组、及29例正常对照组血浆ET、血清丙二醛及超氧化物歧化酶的含量。

Objective:To study the inhibition of xanthine oxidase by renierol extracted from South China Sea sponge and study the influence of renierol on hyperuricemia in mice.

目的：本实验的目的是探讨中国南海海绵提取物renierol对黄嘌呤氧化酶的抑制作用及对小鼠高尿酸血症的影响。

Rosmarinic acid is a competitive inhibitor of xanthine oxidase.

迷迭香酸是黄嘌呤氧化酶的竞争性抑制剂。

The factors affecting the enzyme stability of xanthine oxidase from Arthrobacter g-l984 are studied.

研究pH、温度、金属离子和一些添加剂对黄嘌呤氧化酶稳定性的影响。

The level of uric acid in plasma and the activities of xanthine oxidase in the plasma and the small intestine were determined.

试剂盒检测血浆尿酸含量、血浆及小肠组织黄嘌呤氧化酶的活性。

The methods of xanthine oxidase and Southern blotting were used to determine the activity of superoxide dismutase and the length of telomere.

用黄嘌呤氧化酶法对肝组织SOD活性进行测定，用Southern blotting方法测定肝组织端粒长度。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。