查询词典 cyclobutane

Photoreactions of 8 with 15-19, on the other hand, furnished the corresponding [2+2] cyclobutane products and the annulation products together.

二氯马来酰亚胺（8）与15—19的光化反应中则分别得到相应[2+2]的环丁烷产物和增环产物，在与19的反应中，还得到由环丁烷产物脱氯化氢后得到的环丁烯开环的二烯产物。

By the methods of DFT,6-311Gand 6-311+Gbasis set,we optimized the geometry conformation of the neutral moleculesor ions of cyclopropane,cyclobutane,cyclopentane,cyclohexane,also calculatedthe frequency of these species.

顺磁共振实验也叫电子顺磁共振或电子共振或电子磁共振，是检测自由基的一个最灵敏、最直接的方法。

This is the first interstrand type of cyclobutane dimer to be isolated and characterized in DNA.

这是cyclobutane二聚体的第一个interstrand类型在脱氧核糖核酸将隔绝和描绘的。

Objective To investigate the production and removal of cyclobutane pyrimidine dimer by HaCaT cells after UVB irradiation, and the effect of baicalin in this process.

目的探讨黄芩甙对UVB照射后HaCaT细胞光产物环丁烷嘧啶二聚体的产生和清除的影响。

The one electron oxidative splitting reaction mechanism between 9,10-anthraquinone-2-sulfonate and cyclobutane dimethylthymine dimer was acquired.

研究了蒽醌-2-磺酸盐与环丁烷型二甲基胸腺嘧啶二聚体发生的单电子氧化裂解反应机理。

Function of Mg Ion in protecting and repairing lesioned cells induced by UVB was detected by detecting cell viability and yield of cyclobutane pyrimidine dimers.

通过观察镁离子对紫外线辐射损伤后细胞活性与光产物产量的影响，以明确镁离子对UVB辐射细胞损伤的防护作用。

The major lesions induced by UV light are cyclobutane pyrimidine dimers, which are repaired by CPD photolyases.

DNA光解酶中保守部位色氨酸残基在DNA光复活中扮演着重要角色。

On the basis of the photoreactivity, spectroscopy, and spectrometry data, we determined the structure of the new photoproduct to be a nonadjacent cis-anti cyclobutane dimer formed between T2 and T7 with the absolute stereochemistry depicted by structure I (Figure 8B).

结论根据photoreactivity、分光学和光谱数据，我们确定新的photoproduct的结构是nonadjacent同边反cyclobutane二聚体被形成在T2和T7之间以结构描述的绝对立体化学I (图8B)。

The photocycloaddition of 1-naphthonitrile (1-NpCN) and 2,3-dimethyl-2-butene in cyclohexane or benzene gave cyclobutane 3 primarily,but that of 2-NpCN gave azetine 6 asthe major and cyclobutane 5 as the minor product in low conversion photolysis.

在低转化光解情况下，1-萘甲腈(1-NpCN)和2，3-二甲基丁烯-2在环已烷或苯中的光环加成反应主要得到环丁烷3，但2-NpCN主要得到氮杂环丁烯6和少量的环丁烷5，三氟醋酸量增加抑制1-NpCN和DMB的光环加成反应，表明TFA与基态及单激发态1-NpCN生成非光反应的复合物，它也淬灭(1-NpCN-DMB)激基复合物。

The photocycloaddn. of 1-naphthonitrile (1-NpCN) and 2,3-dimethyl-2-butene in cyclohexane or benzene gave cyclobutane I primarily, but that of 2-NpCN gave azetine II as the major and cyclobutane III as the minor product in low conversion photolysis. The photocycloaddn. of 1-NpCN with DMB is retarded by increasing amts. of trifluoroacetic acid which is shown to form non-photoreactive complexes with ground state as well as with singlet excited state 1-NpCN. It also quenches the *(1-NpCN-DMB) exciplex.

在低转光解情况下，1-萘甲腈(1-NpCN)和2，3-二甲基丁烯-2在环已烷或苯中的光环加成反应主要得到环丁烷3，但2-NpCN主要得到氨杂环丁烯6和少量的环丁烷5，三氟醋酸量增加抑制1-NpCN和DMB的光环加成反应，表明TFA与基态及单激发态1-NpCN生成非光反应的复合物，它也淬灭^*(1-NpCN-DMB)激基复合物。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。