嘌呤碱基

SERS technology is used,in this paper,in studying guanine and cytosine,and their absorption properties,especial the time effect.

本文应用表面增强喇曼散射技术对两种碱基―鸟嘌呤和胞嘧啶―进行了研究，并对其在银镜上的吸附特性做了分析。

Among the four usual bases, guanine damage was much more serious than those of the other three.

同时证实DNA损伤具有碱基特异性，即主要是鸟嘌呤受到损伤。

In the end, the effects of methylation on the properties of uracil and adenine-uracil base pair have been investigated.

最后，我们研究了甲基化对脲嘧啶单体以及腺嘌呤-脲嘧啶碱基对的影响情况。

The mutagen mechanism is presumed single factor dominant.(4)There was 85 percent transvertion in mutagen spectra, and they were all G:C→T:A transvertion. The maximal possibility of mutagen mechanism is analyzed as followed:ion beam implant → breakage cell surface and enter the interior → stimulate plentiful radical born → radical oxidize and damnify DNA → G becomes 8—oxoG → 8—oxoG pairing A → result in G:C→T:A transvertion(5)Production of transition was presumed that ion beam implantion damnified DNA, stimulate activity of MMR interveniented by methyl reducing.

诱发突变谱中碱基颠换比例是0.85，且是全部G：C→T：A颠换，推测低能离子束诱变鼠伤寒沙门氏菌得分子机制可能为：离子注入→通过破坏细胞表面进入内部→刺激产生大量自由基→自由基氧化损伤DNA→G变成8氧—7，8—二氢鸟嘌呤(8—oxoG)→8—oxoG与A配对→导致G：C→T：A颠换。

A form of post-transcriptional modification to mRNA in eukaryotes in which adenine is deaminated to form inosine, an unusual base.

真核生物中对mRNA进行转录后修饰的一种形式，修饰时将腺嘌呤脱氨基形成次黄苷，次黄苷是一种非普通碱基。

A I editing A form of post-transcriptional modification to mRNA in eukaryotes in which adenine is deaminated to form inosine, an unusual base.

A I 编辑真核生物中对 mRNA 进行转录后修饰的一种形式，修饰时将腺嘌呤脱氨基形成次黄苷，次黄苷是一种非普通碱基。

In the dehydrogenating process,the anionic A-T fragmentgradually changes its electronic configuration fromπ~* toσ~* state,like the singlebases adenine and thymine.

在脱氢过程中，阴离子A-T的碎片会逐渐改变它的低能电子组态，从π~*态转变到σ~*态，这种变化跟在单个碱基腺嘌呤和胸腺嘧啶的情况相似。

This kind of configuration suits the multi-nucleotide chain's purine pyrimidine alternate area. in 1989, the American scientists with scanning tunnel electron microscope law visual observation double helix DNA double helix DNA ︰ in 1952, Austrian lineage US biology chemist Zha Qiefu (E.chargaff,1905-) have determined in DNA 4 kind of basic group content, the discovery gland fat ling and thymine quantity are equal, the bird fat ling and cytosine quantity is equal.

这种构型适合多核苷酸链的嘌呤嘧啶交替区。1989年，美国科学家用扫描隧道电镜法直接观察到双螺旋DNA 双螺旋DNA︰1952年，奥地利裔美国生物化学家查伽夫（E.chargaff，1905—）测定了DNA中4种碱基的含量，发现其中腺膘呤与胸腺嘧啶的数量相等，鸟膘呤与胞嘧啶的数量相等。

A nucleotide consisting of one molecule each of a phosphoric acid, a sugar, and either a purine or a pyrimidine base .

单核苷酸磷酸、糖、嘌呤或嘧啶碱基中的一种，它组成的一个分子的苷酸

XRCC1 also participates in BER, it restores DNA damage caused by all kinds of damage by single-strand restoration.

APE基因是碱基切除修复的重要成员，主要负责修复烷化剂和氧化损伤造成的脱嘌呤/脱嘧啶位点。

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。