二聚

It indicates that the N—O bonds in the singlet dimer adsorption configurations are weaker than any other structures, and this is propitious to the NO direct decomposition. 7. Unlike NO molecules interaction with copper atoms, when two NO molecules interact with the adjacent silver atoms, the non-planar structures are more stable than the planar.

同时，单重态的二聚体与相邻的金属铜和银原子作用时，由于电子从金属原子转移到二聚体上的数量最多，因此在这种吸附构型中，金属原子被离子化的倾向最大，同时使得二聚体中N—O键被削弱的程度也最大，有利于NO的直接分解； 7。

The results showed that POD activity increased at first and then decreased in the skin and flesh of root. The peak occurred at 40 d and 60 d in the skin and flesh, respectively. POD activity in the skin was higher than that in the flesh at 30 d and then contrary results were observed. The higher POD activity was, the more POD isoenzyme was. The pattern of POD isoenzymes was different between skin and flesh at different vegetative growth stages. POD isoenzymes in the skin were composed of five monomers and four dimers while five dimers or two monomers, two dimers and one tetramer in the flesh. POD isoenzymes in the root were mainly acidic. POD localized mainly in the cell walls of periderm, cambium, xylem ray, xylem vessels and primary xylem.

结果显示，心里美萝卜营养生长期肉质根的皮和肉中POD活性均先升高后降低，分别在播种后第40 d和60 d出现峰值，30 d时皮中POD活性高于肉，之后则相反，酶活性最高时同工酶数目也最多，不同时期，皮和肉中同工酶种类不同；皮中POD同工酶由5个单体和4个二聚体组成，而肉中由5个二聚体或2个单体、2个二聚体和1个四聚体组成，均以酸性同工酶为主；组化定位显示POD主要分布在肉质根的周皮、形成层、木射线、木质部导管和肉的初生木质部等的细胞壁附近。

The excited-state intramolecular proton transfer tautomerism reaction of 6-methyl-4-hydroxy pyri-midine monomers and dimmers was investigated by the ab initio method with the self-consistent reaction field with Tomas's polarized continuum mode and CIS theories at HF level on the basis of 6-311+G* and 6-31G basis set. By studying the potential energy surface, it was found that the monomer's ground-state proton transfer process together with the excited-state proton transfer process is a molecular system of four energy level, but dimmers were not, which can be used to explain the fact that UV-visible absorption and fluorescence spectra of monomer and dimers all corresponded to quinoid.

采用 ab initio HF理论的组态相关CIS方法和连续溶剂模型PCM，分别在6-311+G*和6-31G水平上研究了6-甲基-4-羟基嘧啶单体及二聚体激发态质子转移的异构化反应；对其反应势能面的研究发现，单体基态和激发态的异构化反应一起可以形成四能级的分子电子体系，而二聚体的却不能，由此解释了单体和二聚体的紫外吸收光谱和荧光发射光谱均对应于酮式构型的原因。

The results show that isobutene oligomerization is fast liquid-solid reaction. Under the temperature of 80 ℃～120 ℃ and pressure of 2.0 MPa, the products of oligomerization are mainly dimers and trimers of isobutene. The yield of trimers is higher than that of dimers and the mass fraction of trimers decreases with reaction temperature increasing. The yield of tetramers is much lower than that of dimmers and trimers. The tetramers are formed by reaction of isooctenes and C8 carbonium ion.

结果表明，异丁烯齐聚反应为快速液固相催化反应，在80 ℃～120 ℃，2.0 MPa的实验条件下，反应产物主要是异丁烯的二聚物和三聚物，且三聚物的收率远高于二聚物，两者的浓度比值随反应温度的升高而下降；少量四聚物的生成主要源于碳八烯烃与碳八正碳离子的反应。

Some isoforms were detected in the serotonin dimeric sprcies The structure of these isoforms need to be elucidated in the future. In conclusion, the dimeric species of serotonin is strongly related to pigment on rice.

目前的研究结果无法确定二聚体的结构，但由结果显示二聚体的含量似乎与水稻外壳的色素变化相关，因此推测 serotonin 二聚体极有可能改变水稻外壳色素。

The chain scission occurs at the position with respect to double bonds, forming the main products including dipentene, styrene and vinyicyclohexene.

二聚体形成途径主要有两种：（1）主链自由基进行分子内转移，&反咬&实现环化，生成二聚体；（2）单体通过双分子合成反应生成二聚体。

The reaction of [60] fullerene with dimethyl malonate and diethyl malonate in the presence of manganese acetate dihydrate for 20 min afforded singly bonded [60] fullerene dimers in a 1, 4-addition pattern.

Mn作为一类良好的自由基引发剂，能有效地催化C〓与丙二酸二甲酯和丙二酸二乙酯的自由基加成反应，生成C〓的二聚体。在回流的氯苯中随着时间的的延长，二聚体分解成1，4-双加成的C〓衍生物。

It has also been found that acidic medium is necessary for the formation of protonated monomer and dimer. The stability of the dimer of the tungstophosphate is lower; a pure monomer can be obtained by treating the mixture with a base (Bu4NOR). However, the dimer of tungstosilicate is stable under the same condition.

实验结果还表明，酸性介质是生成质子化单体和二聚体的必要条件，且钨磷酸盐二聚体的稳定性较低，用碱(Bu4NOH)处理合成产物可得纯的钨磷酸盐单体，而相同条件下钨硅酸盐的二聚体却比较稳定。

The reactions involved in the co-curing are: cyclodimerization and cyclotrimerization of cyanates, polyetherfication of epoxy groups and cyclotrimerization of cyclic dimers, as well as the formation of oxazolidinone rings.

反应历程首先是氰酸酯发生自聚反应形成二聚体或三聚体，然后二聚体可进一步共聚形成三嗪环，此过程伴随着环氧基的聚醚反应，最后是三嗪环与剩余的环氧基反应形成NFDA1唑烷酮。

The optimum conditions for this reaction were confirmed: the mole ratios of the Lewis base and AlCl〓 with the electron-rich aromatic monomer are 1. 2 and 3. 4, respectively; 1, 2-dichloride ethane is the most suitable solvent in this reaction; The solution of the two reactants must be added slowly to a large amount of solvent containing catalyst under pseudo-high dilution conditions; The Lewis base, such as NMP, DMF are applicable in this reaction system.

在此理论的指导下，通过对单体结构的模拟，高选择性地合成了一种新型结构的芳香环状聚硫酯二聚体，对其结构进行了精确的表征，在不同溶剂中得到了该环状二聚体的单晶，单晶X-ray衍射表明该二聚体为环张力极小的大环化合物。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。