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The strongly acidic cation exchange resin catalyzed synthesis of fructone-B by the reaction of ethyl acetoacetate and 1,2-propanediol was studied.

以硫酸高铈铵为催化剂，通过乙酰乙酸乙酯分别与乙二醇和1，2-丙二醇反应合成了苹果酯-A和苹果酯-B，研究了催化剂等有关因素对产品收率的影响。

As an amine and organic cation, agmatine also has much more targets in vivo like the NMDA receptor.

它作为一种阳离子胺类物质，除了咪唑啉受体外，在生物体内还存在多个作用靶点，NMDA受体是其中最重要的作用靶点之一。

The complexes ability for alkalic cation has the high influence on the catalytic activity.

添加与冠醚环直径相匹配的碱金属离子能显著提高催化活性；3。

Saline soils and the rice paddy soils developed on saline soil.were sampled from Zhenlai county of Jilin Province in this paper.The main alkalize characteristic parameters,including pH,cation ex- change capacity,exchangeable Na~+,exchangeable sodium percentageand the content of wa- ter-soluble salty,were measured.

本文中的土样采自吉林省镇赉县，在盐碱土的典型区域，选择了未开发利用的盐碱土和在盐碱土基础上开发为稻田土壤的剖面，测定计算了土壤 pH 值、阳离子交换量、交换性 Na~+、碱化度和水溶性盐总量等主要碱化特征参数。

The substance with a molecular weight of 6.28kDa has very strong cation character determined by the electrophoresis of diaphragm wafer of fiber of acetic acid. The substance with antibacteria action obtained from forest frog is made up of alanine,aminoacetic acid,leucine,Isoleucine,Proline,aminoglutaric acid,threonine,Serine,lysine.

纯化林蛙皮肤中的抗菌活性物质经醋酸纤维薄膜电泳，表明其具有较强的阳离子特征；经氨基酸分析，表明林蛙皮肤抗菌活性物质是由丙氨酸、甘氨酸、亮氨酸、异亮氨酸、脯氨酸、中国林蛙皮肤抗菌肽的分离纯化和鉴定一摘要谷氨酸、苏氨酸、丝氨酸、赖氨酸组成。

In this research, the spider silk from the major ampullate gland of native Nephila pilipes was collected via the forced-silking apparatus at the reeling speed of 3 m/min. The obtained silk was dissolved in hexafluoro-isopropanol. The influence of pH and temperature over the secondary structure of the silk protein in solution state was examined via Circular Dichroism. The effect of silk concentration and electrical field strength on the structure conformation of silk protein during film casting process was investigated via FT-IR. During the drying process, the increase of silk concentration and the presence of electric field tend to form β-sheet and β-turn. Finally, the dried film of silk protein was treated with different temperatures and cation solutions to study the post-treatment effects.

本研究所采用之蜘蛛丝蛋白质系取自本土品种人面蜘蛛之大囊壶腺体，以3 m/min之卷丝速度强迫取丝(forced-silking)收集蜘蛛丝，再将纤维溶於六氟异丙醇溶剂中配制成溶液，以圆二色光谱仪分析在不同 pH 值与温度条件下丝蛋白质在溶液中之二级结构变化，再将蜘蛛丝溶液以不同浓度及电场强度下乾燥成薄膜后，以傅立叶红外线光谱仪检测分析丝蛋白质在固体状态下之二级结构，最后以不同温度加温、离子溶液浸泡等条件对乾燥所得之薄膜进行后处理，并分析其二级结构之变化。

The polymeric copper tetraaminophthalocyanine incorporated with aniline film (p-CuTAPc-PAN) was prepared using electrogeneration. The polymeric reaction between CuTAPc and aniline occurs as a result of the attack of an electrophile such as the cation radical NH2 groups remaining the p-CuTAPc on the 2-positon of the benzenoid ring.

2用电化学方法制备四氨基酞菁铜与苯胺共聚的高分子聚合膜(p-CuTAPc-PAN)，对其性质进行了研究，并与聚四氨基酞菁铜进行对比。

X-ray single crystal analysis of a new paramagnetic manganese complex with DTPA-BpABA (a DTPA- bisamide derivative), Mn·4H2O, shows that four oxygen atoms and three nitrogen atoms from the ligand coordinate to Mn cation, forming a seven-coordinate distorted pentagonal bipyramid polyhedron.

采用X-射线单晶衍射法对锰与DTPA-BpABA(DTPA-二酰胺衍生物)形成的一个新的顺磁性配合物Mn·4H2O进行了结构测定。

Cation and anion effects on permeation amount of 2,2＇-bipyridyl through the molecularly imprinted polymer membrane was investigated respectively.

分别考察了阳离子和阴离子对印迹膜渗透模板分子的影响。

In this paper, two novel Organic- Inorganic Hybrid Compounds Containing POMs were achieved by selecting POMs with unique structure and properties and organic ligands with bipyridyl groups as building blocks and transition mental cation as templating through hydrothermal reaction.

本课题选择结构和性能独特的多金属氧酸根和多齿有机配体作为构件，以金属离子作为模板合成出新型多金属氧酸盐无机－有机杂化化合物。

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。