Sugars commonly found in the in vivo oxidation to release energy to meet the needs of the activities of And carbohydrates is an important part of the cell membrane， its conformation expression of the cell The organism's basic life processes and the occurrence of certain diseases， the development process involves the participation of Therefore， the identification and detection of the sugar of great significance to the developments in the field of medicine， cell biology and To a certain extent by the determination of the sugar content of the human body can understand the health status of the human Detection sugar chromatography， enzymatic Enzymatic methods susceptible to interference caused by contaminants in the sample limitations， and the source and purification of the enzyme is a critical Detected by chromatographic methods sugar as follows: gas chromatography (GC)， liquid chromatography (LC)， affinity chromatography and high performance liquid chromatography (HPLC)， capillary electrophoresis (CE)， ion chromatography， but they have their own In recent years， the synthesis can be selective recognition of biologically active molecules sensing material has attracted extensive attention from Phenylboronic acid to identify the body as a fully synthetic multi-hydroxy compounds， with low prices， strong stability， difficult to inactivation， ， so in the past few decades， concern and attention of many Based on the above in this This paper discusses the synthesis process of the two kinds of Novel amide These two kinds of 3 - amide phenyl boric acid compound is a single-boric acid compounds， not yet in SciFinder included， respectively:In this study， simple and quick steps， and less product The obtained products were characterized by infrared spectroscopy， 1 H NMR spectral analysis and melting point determination for the structural characterization， the experimental data show that the structure of the product in line with the structure of the target product， indicating that the experimental Key words: benzene boronic acid derivatives chloride 3，4，5 - fluorophenyl borate 2，3，4，5，6 - pentafluorophenyl borate characterization of synthetic
没人会因为积分费力气翻译的，要么去找熟人要么就要花钱，先给个在线的给你看下International e-commerce is an emerging concept， its meaning is the use of electronic trading as a means of international trade As a new economic model， the international e-commerce shows strong vitality in the world， have experience in the development of the situation on the world economic structure and trade system changes have far-reaching Meanwhile， with the rapid development of new things by many of the problems is worth Pozaimeishao experts to study and This paper is divided into three parts， the first major e-commerce for the concept and characteristics as the beginning of the full text， a brief introduction and The second part is the full text of the focus primarily on the basis of international taxation theory and micro-economic theory to elaborate， the analysis of the international e-commerce for international trade in two major aspects of the First， "e-commerce for international trade interests of the distribution of revenue impact，" the second is "the use of e-commerce and international trade in the information asymmetry " Is the full text of the final part of the ultimate goal: Through the many problems in the above analysis， the corresponding countermeasures and Key words: e-commerce， international trade， international taxation， micro-economic， information asymmetry， the impact of countermeasures
