氮化

Nitrogen mineralization is one of the most important aspects in soil nitrogen circulation.

氮的矿化是土壤氮循环中的重要环节之一。

The soil nitrogen status is a function of the processes of nitrogen fixation , microbial decomposition, nitrification and denitrification

土壤氮状况是一个固氮、微生物分解、硝酸化和脱氮过程的作用。

Food and Drug Administration approes nitrogen mustard, a drug that interacts with DNA chemically to kill cancer cells.

1949年，食品药品管理局批准氮芥治疗癌症，氮芥通过与DNA发生化学反应来杀死癌细胞。烃化剂

Food and Drug Administration approves nitrogen mustard, a drug that interacts with DNA chemically to kill cancer cells.

1949年，食品药品管理局批准氮芥治疗癌症，氮芥通过与DNA发生化学反应来杀死癌细胞。烃化剂

The Mo center of [Mo8](superscript 4)-shows a slight distorted square antiprism coordination environment. The N atoms of cyano groups, acting as acceptors of hydrogen bonds, together with protonate N atoms from organocations and the lattice water, serving as donors of hydrogen bonds, form intricate hydrogen bond interactions, thus generating three-dimensional supramolecular network with the help of π-π interactions of some organocations.

Mo8(上标 4-)离子中，Mo中心处于扭曲的反四棱柱配位环境。8个未配位的氰基氮原子作为氢键的受体，有机阳离子上质子化的氮原子和结晶水作为氢键的给体，形成了丰富的氢键作用，这些氢键作用连同部分有机阳离子间的π-π堆积、阴阳离子间的静电力和Van Der Waals力构筑成三维超分子网络。

The experimental results from cyclic voltammetry and constant-potential electrolysis show that the mechanism of the reaction was two molecules and three steps electrochemical process with eight-electrons transferred: anion radical arose in the first step; two-electrons were transferred in the second step and accompanied with coupling reaction of radicals and protonation and dehydrate, the main product was azoxybenzene; two-electrons were transferred in the third step, and azobenzene was achieved.

研究结果表明，硝基苯在铂电极上的电还原反应为双分子八电子三步骤电化学过程：第一步反应为准可逆单电子转移步骤，产生阴离子自由基；第二步为二电子转移步骤，并伴有随后的双分子不可逆自由基偶合反应和快速质子化及脱水反应，主要产物为氧化偶氮苯；第三步是二电子转移产生偶氮苯的过程。

The 6- cyano-1, 1 (1, 3- dioxypropylidene)-7-(carbomethoxyl group- methyl - 5- oxo-Delt6 (8)- tetrahydrochysene indolizine and haloethane reacts with each other for ethylization with existence of alkali and organic solution with or without phase transversion catalyst, and produces mentioned product.

本发明在相转移催化剂或无相转移催化剂存在下，6-氰基-1，1-(1，3-亚丙二氧基)-7-(甲氧羰基-甲基-5-氧代-Δ6(8)-四氢中氮茚类化合物与卤代乙烷在碱和有机溶剂的存在下进行乙基化反应即得6-氰基-1，1-(1，3-亚丙二氧基)-7-1′-(烷氧羰基-丙基-5-氧代-Δ6(8)-四氢中氮茚类化合物。

The reaction mechanism for the formation of ultimate carcinogens diazohydroxide, diazonium and oxoniumions by α-hydroxylation-NPYR and the alkylation process of C and guanine were investigated including solvent effects at the B3LYP/6-31G(superscript **) level.

采用密度泛函理论，在B3LYP/6-31G水平上，研究了气相和水溶剂中，α-羟基化吡咯烷亚硝胺(-αhydroxylation-NPYR， A)代谢为终致癌物重氮氢氧化物、重氮烷阳离子和氧离子，以及C与鸟嘌呤碱基相互作用的反应机理。

Using butanediol as initiator, boron-trifluoride etherate as catalyst, 3-azidomethyl-3-methyloxetane homopolymer was synthesized by the cationic polymerization of 3-azidomethyl-3-methyloxetane which was carried out in dichlorometane.

以1，4-丁二醇为引发剂，以三氟化硼乙醚络合物为催化剂，以3-叠氮甲基－3-甲基氧丁环为单体，以CH2Cl2为溶剂，按阳离子开环聚合机理，合成了含能粘合剂3-叠氮甲基－3-甲基氧丁环均聚物。

But foliar N of the remaining mass still decreased with decreasing mass, mainly due to mineralization.

但氮剩余量仍随重量的减少而下降，可能由於氮只发生矿质化作用。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。