黄嘌呤

Objective: Using HPLC To determine hypoxanthine in co-hirudo injection for establishing its HPLC fingerprint, and evaluating its internal quality. Method: The chromatographic separation was performed on a Kromasil C18 column (4.6 mm×250 mm,5 μm).

中文摘要：目的：用高效液相色谱法测定复方水蛭注射液中次黄嘌呤的含量，并建立注射液指纹图谱，全面评价其内在质量。

Two modified beacons containing of uracil and hypoxanthine have been used to validate the assay on purified proteins with success. However, while applying the assay to cell extracts, the results were interfered by non-specific nuclease activities.

我们分别设计其中含有尿嘧啶以及inosine的分子信号，以测定尿嘧啶-核酸醣解酶（uracil-DNA glycosylase）以及次黄嘌呤-核酸醣解酶（hypoxanthine-DNA glycosylase）的活性。

Objective: To study the inhibitory effect of rosmarinic acid on xanthine oxidase.

目的：研究迷迭香酸对黄嘌呤氧化酶的抑制作用。

Xanthine oxidase is an enzyme involved in the production of uric acid.

黄嘌呤氧化酶是一种与尿酸生成相关的酶。

Drugs that block some activities of the enzyme, known as xanthine oxidoreductase, might

研究人员说，像黄嘌呤氧化还原酶等已知的阻止酶活性的药物，可能因此提供一种新的在肥胖形成前来对抗它的抗肥胖疗法。

The potential sources of NO in plants include nitric oxide synthase, nitrate reductase, xanthine oxidoreductase and the nonenzymatic pathway.

在植物中， NO的潜在来源包括一氧化氮合成酶、硝酸还原酶、黄嘌呤氧化还原酶和非酶促途径。

A human promyelocytic leukemia cell mutant (HL-60-AR) with deficiency in HGPRT and resistance to 8-AG was established by treat〓nt of the HL-60 cells with MNNG and prescreened in 0.3% agar RPMI-1640 semisolid medium containing 8-AG. The mutant cells show the following characteristics:(1) resistant to cytotoxic action of 8-AG and growing vigorously in medium containing 20ug/ml 8-AG;(2) capable of forming 〓〓 colonies in soft agar medium in the presenee of 8-AG:(3) highly sensitive to HAT selective medium and fail to growing in HAT medium of form colonies in soft agar medium containing HAT;(4) completely deficinet in HGPRT activity; and (5) no radioactive silver grains over the mutant cells due to the absence of -hypoxanthine incorporation showed by radioautography.

一、用MNNG诱变和8-AG进行抗性筛选，成功地建立了一株抗高浓度8-AG和完全缺失HGPRT活性的人早幼粒白血病细胞突变株(HL-60-AR)，该细胞能抵抗8-AG的毒性作用，对HAT选择培养基十分敏感，检测不到HGHRT活性，不能参入〓H一次黄嘌呤。

The Onsager solvate theory model was employed for aqueous solution calculations.

Onsager反应场溶剂模型用于水相的计算，计算结果表明，2，6-二硫代黄嘌呤在气相和水相中主要以双硫酮形式存在。

Molecular structures of fourteen 6-thioxanthine tautomers were calculated by the B3LYP/6-311G** method, both in gas and aqueous phases, with full geometry optimization. The Onsager solvate theory model was employed for aqueous solution calculations.

在密度泛函B3LYP/6-311G**水平下，对14种气相和水相中可能存在的6-硫代黄嘌呤异构体进行了几何构型的全自由度优化，并计算出它们的总能量、焓、熵、吉布斯自由能。

Keeping drinking tea helps maintain the regular balance of acid base of blood, for tea leaf, which is a kind of wonderful alkalescence drink, contains some alkaloid substances such as theine, theosine, theobromine and xanthine.

饮茶能维持血液的正常酸碱平衡。茶叶含咖啡碱、茶碱、可可碱、黄嘌呤等生物碱物质，是一种优良的碱性饮料。

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。