Praparation and Characterization of Novel Magnetic Chitosan Materials

壳聚糖分子中含有大量的官能基团如氨基、羟基，从而具有良好的吸附性能。若在壳聚糖中引入磁性物质，则壳聚糖材料在外加磁场条件下易于同介质分离，并且所得磁性材料还能保留壳聚糖自身的特性。本论文以此为出发点，选用铁离子溶液为磁性Fe3O4源并将其与壳聚糖溶液混合，以氨水为沉淀剂，通过一步沉淀法制备磁性壳聚糖微球(magneticchitosansphere，MCSS)；采用反相乳液法，将氨水溶液首先分散，再加入上述混合溶液制备微米级的中空磁性壳聚糖微球(hollowmagneticchitosansphere，H-MCSS)；利用壳聚糖络合铁离子的性能，用氨气熏蒸法制备磁性壳聚糖杂化材料(hybrid...Abstract Chitosan (CS) has excellent adsorption performance because of the large amount of functional groups such as amino and hydroxyl groups of the macromolecule. If magnetic component was introduced into chitosan material, the composite material could not only retain the characteristics of chitosan, but also be easily isolated from the adsorption medium under a magnetic field. Therefore, Fe2+ ...学位：理学硕士院系专业：材料学院材料科学与工程系_高分子化学与物理学号：2072008115057

缅甸中立外交政策传统的形成与原因

中立主义是缅甸的传统外交政策,1948—1954年是缅甸该项政策的确立和形成期。这一时期,随着中苏对中立民族主义国家的政策调整,英美对缅政策出现偏差,缅甸国内出现政治经济危机,缅甸与东西方之间的三角关系的发展动力与变量发生了新的变化,缅甸较快调适了它在二者之间的钟摆,开始实行更加平衡的中立外交,并长期坚持了这一政策。缅甸人在确立中立外交政策的过程中所体现出的不安全感、地缘心态、对大国的防范、对自身的定位与认识,是构成其中立外交传统的基本要素,已内化为缅甸的传统政治文化,也是外界观察其外交政策趋势的基本维度。教育部人文社会科学重点研究基地项目“冷战时期中国与东南亚关系编年史”(18JJD770002);教育部人文社会科学研究项目“1949年以来英缅关系对中国在缅甸利益的影响和启示”(17YJCGJW013);;广东省教育厅2016年重点平台及科研项目(2016WTSCX101

我国普通高校高水平运动员职业期望研究与就业指导建议

运动员的就业问题一直是饱受热议的社会问题,运动员的职业期望则是研究运动员就业问题的基本点。笔者运用文献资料法、问卷调查法和数理统计法对我国普通高校360名在校高水平运动员的职业期望进行了调查研究。研究结果表明:1.我国普通高校在校高水平运动员最期望从事的职业为体育教师与教练;2.运动员的职业期望与性别、生源地和社会阶层背景不存在显著性差异,与运动等级和运动项目存在高度显著性差异。基于对运动员职业期望的研究,运动员的就业指导需要注重:(1)开设职业指导课程;(2)完善课程体系设置;(3)促进信息有效交流;(4)加大就业扶持力度。厦门大学中央高校基本科研业务费项目(T2013221039

SBS分子结构对其在选择性溶剂中自组装行为的影响

线形两嵌段(SB)、线形三嵌段[(SB)2]和星形四臂三嵌段[(SB)4]的苯乙烯-丁二烯嵌段共聚物(SBS)溶于选择性溶剂丁酮后的聚集自组装行为差异极大。粘度测定和透射电镜观察结果表明,在溶液中,(SB)4由其内部聚丁二烯嵌段(PBD)聚集自组装成单分子核-壳结构;(SB)2在低于转折浓度时由多个分子的PBD聚集自组装成开放式核-壳结构,在高于转折浓度时则成为稳定聚集体;而SB自组装成为宏观不溶的特大胶体微粒

Construction of Normalized cDNA Library from Hepatopancreas of Abalone Haliotis diversicolor supertexta Exposure to Tributyltin

用rdP试剂提取三丁基锡暴露诱导的杂色鲍肝胰腺总rnA,经OlIgOTEX纯化得到MrnA;应用SMArT技术合成双链CdnA,双链特异核酸酶(dSn)进行双链CdnA的均一化,构建了杂色鲍三丁基锡暴露诱导下的均一化CdnA文库。原始文库的库容为4.3x106Cfu/Ml,重组率为97.9%。从文库中随机挑选了3288个克隆进行测序,得到3048个高质量EST序列,其中有370条COnTIgS,2103条SInglETS,unIgEnES共2473条,冗余率为18.86%。以上结果说明该文库质量较好,为进一步筛选相关功能基因打下基础;较低的冗余率说明该文库值得继续使用大规模ESTS测序的方法寻找相关功能基因,并为进一步使用基因芯片技术研究相关功能基因的表达谱提供便利。A normalized cDNA library from hepatopancreas of abalone Haliotis diversicolor supertexta exposure to Tributyltin was constructed.Total RNA were prepared using RDP reagent.Oligotex(QIAGEN)was used to separate the mRNA from total RNA.The first strand cDNA was synthesized by transcription of mRNA with the SMART technique.The LD-PCR was performed using a modified SMART primer as the primer set,and the first-strand cDNA as the template to synthesize double strand cDNA.Double strand cDNA was normalized using Duplex-Specific Nuclease(DSN).The containing capacity of the unamplified cDNA library was 4.3×106 CFU/ml with a recombinant rate of 97.9%.A total of 3 288 clones were random selected to be sequenced,and 3 048 high quality ESTs were generated.After processing,a total of 2 473 unigenes comprising 370 contigs and 2 103 singlets were obtained.The redundancy was 18.86%.These results indicate that the normalized cDNA library is suitable to be used for further cloning and analysis of genes related to tributyltin exposure.厦门市科技计划项目(3502Z20055024);国家自然科学基金(20877034);集美大学创新团队基金(2008A001

Office认证机制中密钥导出函数安全性分析

微软Office2007及其后续版本采用ECMA-376的文件加密格式,其安全性主要通过用户认证和文件加密实现,而密钥导出算法是整个安全机制的核心。为此,研究ECMA-376密钥导出算法的安全性,利用Game-Playing技术计算该密钥导出算法与随机函数的不可区分优势的上限。通过该理论和攻击实例对Office安全性进行分析,结果表明,当用户口令字符长度大于6时,Office具有一定的安全性

Mechanism of Absolute Asymmetric Synthesis and Solid-State CD Spectroscopy of BPOB

以苯乙酮与间苯二甲酸甲酯为原料经由Claisen缩合制备了1,3-二(3-苯基-3-氧代丙烯醇)苯(BPOB).用元素分析、MS、1H NMR、UV吸收光谱、X射线单晶衍射和固体CD光谱等对其进行了表征.晶体结构数据显示,BPOB属于Sohncke空间群P212121,UV和1H NMR谱表明,BPOB在溶液中主要以烯醇式存在,固体CD光谱和重结晶实验证明,BPOB手性晶体的形成是结晶诱导的绝对不对称合成.1,3-bis(3-phenyl-3-oxopropanoyl)benzene (BPOB) was prepared by Claisen condensation of aceto-phenone and dimethyl isophthalate and characterized by elemental analysis, MS, 1H NMR, UV absorption spectrum, solid-state circular dichroism (CD) spectra, and X-ray single-crystal diffraction. The X-ray crystallographic data indicated that BPOB crystallized in a Sohncke group P212121, UV and 1H NMR showed that the enol tautomer was the most dominant form in solution, and the solid-state CD spectra and repeated recrytallization revealed that the formation of chiral BPOB crystals could be regarded as crystallization-induced asymmetric synthesis.国家自然科学基金(20773098);; 福建省自然科学基金(2005YZ1020);; 厦门大学科技创新工程基金(系列2,XDKJCX20061027)资

壳聚糖富氧膜的研究(Ⅱ)

壳聚糖-聚砜酰胺复合膜在干、湿情况下,其富氧性能存在明显的差别,表明壳聚糖是较好的富氧材料。从壳聚糖的结构可看出,它能通过氨基、羟基与许多重金属离子形成螯合物,这种螯合物与低分子氧载体的结构相似.本文在壳聚糖-聚砜酰胺复合膜上固定金属钴盐,并在干、湿两种状态下测定了其富氧性能的差别

Determination of Chlorpromazine and Promethazine and Their Metabolites in Animal Food Using Ultra Performance Liquid Chromatography with Tandem Mass Spectrometry

建立了动物源食品中吩噻嗪类药物氯丙嗪、异丙嗪及其代谢物氯丙嗪亚砜和异丙嗪亚砜同时测定的固相萃取超高效液相色谱-电喷雾电离串联四极杆质谱(uPlC-ESIMS/MS)方法。样品用乙酸乙酯和氢氧化钠溶液提取,OASIS Hlb柱富集净化,超高效液相色谱-电喷雾串联四极杆质谱仪检测,采用多反应监测正离子模式,可以一次性对动物源性食品中的吩噻嗪类药物氯丙嗪、异丙嗪及其代谢物氯丙嗪亚砜和异丙嗪亚砜进行定性和定量测定。方法在1--100μg/l范围具有良好的线性,回收率为76%--96%,定量下限(S/n>10)为异丙嗪5μg/kg,氯丙嗪、氯丙嗪亚砜、异丙嗪亚砜1μg/kg。检出限(S/n=3)为异丙嗪1.5μg/kg,氯丙嗪、氯丙嗪亚砜、异丙嗪亚砜0.3μg/kg。A method for the simultaneous detection residues of chlorpromazine and promethazine and their metabolites chlorpromazine sulphoxide and promethazine sulphoxide in animal foods was developed by using solid phase extraction(SPE) combination with ultra performance liquid chromatography-electrospray ionization triple-quadruple tandem mass spectrometry(UPLC-ESI MS/MS).The chlorpromazine and promethazine and their metabolites in the test sample was extracted with ethyl acetate and sodium hydroxide solution.The homogenate was centrifuged and the supernatant was collected.The extract was cleaned up and concentrated on an Oasis HLB cartridge,and then analyzed by UPLC-ESI MS/MS under the positive ion mode using multiple reaction monitoring(MRM) mode.Extraction and chromatographic conditions were optimized and the best separation was obtained.The cabalibration curves were linear in the range of 1-100 μg/L.The average recoveries were between 76% and 96%(n=6) in the spiked range of 5-100 μg/kg in pork,fish,dullfrog and milk.The limits of quantification(S/N>10) were in the range of 1-5 μg/kg and the limits of detection(S/N=3) were 0.3-1.5 μg/kg.国家质量监督检验检疫总局科研计划资助项目(2007IK137

壳聚糖富氧膜的研究(Ⅰ)

壳聚糖可用来进行醇水分离,但用于氧氮分离尚未见报道.本文成功地以壳聚糖复合膜分离空气中的氧氮,并且发现干燥膜与在干燥膜表面涂上一层水的“湿膜”之间存在明显的氧氮分离差别. 1实验部分壳聚糖(浙江玉环化工厂)经水洗、酸溶、重沉淀处理后,用稀醋酸溶解,配成一定浓度