嘌

The substitution of a purine for a pyrimidine, or vice versa is a transversion

嘌呤为嘧啶取代或嘧啶为嘌呤所取代，叫做颠换。

The substitution of a purine for a pyrimidine, or vice versa is a transversion

嘌呤为嘧啶取代或嘧啶为嘌呤所取代，叫做颠换。收藏反馈

They were two new compounds, [cyclo(Pro-Val-Phe-Phe-Pro-Val-Phe-Ser-Leu),7],[2-N-(1-methoxycarbonylethyl)guanosine, 10], and eight known compounds,(p-hydroxybenzoic acid, 1),(methyl succinate, 2),(russulaceramide, 3),(phenylalanine, 4),(guanine, 5),(β-carboline, 6),(uridine, 8), and (adenosine, 9). All the compounds were isolated from Amanita exitialis for the first time.

分别为：对羟基苯甲酸(p-hydroxybenzoic acid，1)、丁二酸二甲酯(methyl succinate，2)、神经酰胺(russulaceramide，3)、苯丙氨酸（phenylalanine，4）、鸟嘌呤核苷(guanine，5)、β-咔啉(β-carboline，6)、环（脯氨酸-缬氨酸-苯丙氨酸-苯丙氨酸-脯氨酸-缬氨酸-苯丙氨酸-丝氨酸-亮氨酸） [cyclo(Pro-Val-Phe-Phe-Pro-Val-Phe-Ser-Leu)，7]、尿嘧啶核苷(uridine，8)、腺嘌呤核苷(adenosine，9)、2-N-(1-甲氧羰基乙基)鸟苷[2-N-(1-Methoxycarbonylethyl)guanosine， 10]。10个化合物均为首次从致命鹅膏中分离得到，其中化合物7和10为新化合物。

Guanosine overproducing mutant was derived from Bacillus subtilis T1001 by using ultraviolet and diethyl sulfate. The mutant was selected directionally and step wisely on the agar plates containing methionine sulfoxide and 8 azaguanine(8 AG).

以枯草芽孢杆菌T1 0 0 1为出发菌株，经紫外线、硫酸二乙酯逐级诱变处理，选育出腺嘌呤缺陷型菌株，然后经蛋氨酸亚砜、8 氮鸟嘌呤( 8 AG)结构类似物平板定向筛选，获得鸟苷高产菌株TA2 0 8。

Six and twelve boors after sepsis, leptin levels in liver homogenate were detected by radioimmunoassay serum alanine aminotransferase and 4 enzymes in liver homogenate. myeloperoxidase, glutathin-S-transferase, xanthine oxidase and superoxide dismutase, all related with synthesis of free radicals, detoxication and purine metabolism, were detected by 96 well spectrophotometry. H-E staining was used to examine the histopathologic changes of liver.

于脓毒症后6 h和12 h，采用放射免疫法测量肝组织匀浆液中Leptin水平，采用96孔分光光度法检测血清丙氨酸氨基转移酶及髓过氧化物酶、谷胱甘肽－S转移酶、黄嘌呤氧化酶、超氧化物歧化酶等4种与自由基合成、解毒和嘌呤生成代谢相关的酶的水平，同时以H-E染色法观察肝组织病理学改变。

The cordyceps grass vegetable, the cordyceps grass is sour, the cordyceps grass many sugar, SOD—enzyme, guanin, urine, the gland... etc., a materials of the pit are all with the natural cordyceps grass homology, the poison reason evaluation:Have no poisonous side effect to the human body, is a stub in the world new species of biggest cordyceps grass in very unique body.

虫草素、虫草酸、虫草多糖、SoD、腺嘌岭、鸟嘌呤、尿嘧啶、腺苷等，核苷类物质都与天然虫草相同，毒理评价：对人体无任何毒副作用，是一株世界上绝无仅有形体最大的虫草新品种。

Electron transfer reaction between the radical cations of purine nucleotides and some aromatic amino acids was studied by use of pulse radiolytic techniques. Time-resolved spectroscopic evidence revealed that the one-electron-oxidized radicals of dAMP and dGMP can be efficiently repaired by tyrosine and tryptophan.

鉴于在DNA光敏损伤过程中主要生成嘌呤碱基阳离子自由基，利用脉冲辐解技术研究了嘌呤碱基阳离子自由基与部分芳香氨基酸的相互作用，获得了酪氨酸和色氨酸对单电子氧化的dAMP和dGMP经快速电子转移修复的瞬态吸收光谱证据。

A yellowish-white, crystalline purine base, C5H4N4O2, that is a precursor of uric acid and is found in blood, urine, muscle tissue, and certain plants.

黄嘌呤一种黄白色结晶的嘌呤硷，c5h4n4o2，它是尿酸的前身，常见于血液、尿液、肌肉组织和某些植物中

Guanine was the highest purine base in eight kinds of beer that had a mean total purine content of 7.05 mg/100mL.

所分析8种品牌的啤酒，其嘌呤总含量平均为7.05 mg/100mL，而四种嘌呤分布则以guanine最高。

Guanine can quench the phthalhydrazidylazoacetylacetone's ECL in acid medium, and the linear concentration range of guanine relative to the ECL intensity is from 2.0×10~(-6) to 1.0×10~(-5) mol/L.The mechanism of phthalhydrazidylazoacetylacetone's ECL on the surface of ITO glass has been discussed according the experimental phenomenon.The phenomenon of ITO self-luminescence has also been studied.It has been found that the machanism of phthalhydrazidylazoacetylacetone on the surface of ITO in different medium is dissimilarity. The phenomenon of ITO self-luminescence may be caused by the interaction of the active oxygen element and ITO's surface.

鸟嘌呤在弱酸性介质中3-(1-乙酰丙酮偶氮)苯二甲酰肼的电化学发光具有显著的淬灭作用，2.0×10~(-6)～1.0×10~(-5) mol/L浓度范围内，电化学发光强度与鸟嘌呤的浓度成良好的线性关系根据相关试验现象对3-(1-乙酰丙酮偶氮)苯二甲酰肼在氧化铟锡玻璃电极上的电化学发光机理进行了初步探讨，并对氧化铟锡玻璃电极自身发光现象进行了研究，研究发现在不同酸度环境中，3-(1-乙酰丙酮偶氮)苯二甲酰肼在氧化铟锡玻璃电极上电化学发光的机理是显著不同的；ITO自身发光可能是由活性氧系分子与ITO镀膜玻璃电极表面相作用引起的。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。