毛细管电泳法快速分离和检测肠毒性大肠杆菌

 建立了快速分离和检测引起仔猪腹泻的肠毒性大肠杆菌K88、K99和 987P细菌细胞的毛细管区带电泳方法 ,并进行了腹泻仔猪粪便中肠毒性大肠杆菌的应用检测分析。结果表明 ,在电泳缓冲液为 0 0 5mol/LNa2 CO3 NaHCO3(pH 9 9)、分离电压为 1 4 1kV、检测波长为 2 1 0nm的电泳条件下 ,E coliK88、K99和 987P的细胞分别具有单一、稳定的特征谱峰 ,其保留时间的相对标准偏差RSD≤ 0 9% ;在确定的实验条件下 ,实现了腹泻仔猪粪便中肠毒性大肠杆菌的快速检测分析 ,发现将出生 5d～ 6d的腹泻仔猪粪便引入培养基中增殖后主要检出K88。     

Synthesis of novel mesoporous silica spheres with starburst pore canal structure

Novel spherical mesoporous silica materials with uniform diameters and starburst mesopore structures were synthesized by a simple one-step procedure with ethanol as the co-solvent in dilute aqueous solution and their formation mechanism was proposed. The arrangement of the pore canal and the diameter of the sphere could be tailored by altering the concentration of ethanol.     

电场作用下苏氨酸的电流特性研究

制备了以液态苏氨酸为沟道材料的四端有机场效应晶体管,观测了其随着栅极电压的不同呈现出源漏两极之间不同的电学特异现象;还观测了苏氨酸在外电场作用下,阻抗随着源漏之间电压频率变化的关系,提出一个极性液体模型解释了其导电机理。     

传感法研究固态钢中镧活度

本文采用LaF3单晶固体电解质测量了473～1223K温度范围内钢中镧的活度.两个平行样品的活度值符合很好,并且LaF3单晶的起始工作温度约为880K.     

溴原子取代对二茂铁液晶化合物介晶性的影响

二茂铁液晶因其独特的稳定性和易于衍生化受到研究人员的青睐[1- 8] 。我们曾经报道过一类单取代二茂铁液晶的合成与介晶性[9] 。这里我们报道另外一类二茂铁单取代液晶 ,并对分子的长度、溴原子取代对介晶性的影响进行探讨。合成路线如下 :1　实验部分ＢｒｕｃｋｅｒＡＣＥ -2 0 0ｓｐｅｃｔｒｏｍｅｔｅｒ,ＣＤＣｌ3作溶剂。ＮｉｃｏｌｅｔＭａｇｎａ-ＩＲ 5 0 0Ｓｐｅｃｔｒｏｍｅｔｅｒ,ＳｅｒｉｅｓⅡ ,ＫＢｒ压片。ＷＲＳ -ＩＡ ,ＣａｒｌｏＥｒｂａ 1 1 0ｂ。Ｐｅｒｋｉｎ -Ｅｌｍｅｒ 7Ｓｅｒｉｅｓ热分析仪 ,分温速度 1 0℃ /ｍｉ…     

TS分子筛催化性能研究Ⅰ．TS－2分子筛催化1，2－丙二醇液相氧化反应的研究

ＴＳ分子筛催化性能研究Ⅰ．ＴＳ－２分子筛催化１，２－丙二醇液相氧化反应的研究①伏再辉尹笃林（湖南师范大学精细催化合成研究所，长沙４１００８１）关键词ＴＳ－２分子筛１，２－丙二醇氧化催化氧化自１９８３年Ｔａｒａｍａｓｓｏ［１］首次合成具有ＺＳＭ－５结构...     

Synthesis of Some Allyl-β-Cyclodextrin Derivatives and their Properties as Capillary GC Stationary Phases

Summary Three -Cyclodextrin derivatives (-CDs) were synthesized by substituting the 2,6-OH groups of -CD with allyl groups and the 3-OH groups with three different acyl groups (valeryl, heptanonyl, octanoyl). The chromatographic properties of these -CDs as stationary phases for capillary gas chromatography (CGC) were studied. The test results showed that the three -CDs possessed good coating properties and that the capillary columns coated with them exhibited high column efficiency. These -CDs can separate not only the disubstituted benzene isomers but also some racemic compounds.     

脱蜡剂DF-1的气相色谱-傅里叶变换红外光谱联用分析

脱蜡剂ＤＦ－１是一种含多种有机成分的碳氢化合物，经气相色谱－红外光谱联用分析后，确定了这些组分的组成与含量。     

Quantum chemistry investigation on the active site of Mn-SOD

In this paper, we carried out a theoretical study on the active site structures of the Mn-SOD with ab initio Hartree–Fock SCF method, and analyzed the molecular orbital energies, charges and atomic orbital contribution to the frontier molecular orbital.