荧光光度法直接测定高纯氧化钕中的痕量镨和铈

使用Ｐ－ＥＬＳ５０荧光光谱仪，在盐酸介质中，用同一激发波长激发，分别测定Ｐｒ（Ⅲ）（ｎｍ）和Ｃｅ（Ⅲ）（３５６ｎｍ）发射峰强度。     

一种含有亚微米孔洞的新型微孔磷酸盐晶体材料的合成及其生长机理

采用水热法成功地合成了一种含有亚微米级孔洞的微孔磷酸盐晶体材料(记为HAP-TAP),其形貌特征是:六棱柱形的晶体表面分布着大量0.4～0.8μm的亚微米级孔洞,孔洞内长有片层状晶体.在样品晶化的过程中,通过控制合成时间,获得了纯六棱柱形晶体的大单晶(记为HAP).使用扫描电子显微镜(SEM)、粉末X射线衍射(XRD)、红外光谱和电子能谱(EDX)对HAP-TAP独特形貌的形成机理进行了研究和揭示.HAP的单晶XRD数据表明,HAP是一种具有二维空旷骨架结构的新型微孔磷酸铝晶体,其分子式为Al5(OH)2(PO4)7(C2N2H10)3.0.5H2O.EDX分析结果表明,生长于六棱柱形晶体孔洞内的片层状晶体为磷酸钛铝材料.     

临床观察Ge—132的毒副反应

为探讨Ｇｅ－１３２的毒副反应，对服用Ｇｅ－１３２的肺癌患者３０８３例进行长期观察。结果发现各项观察指标，治疗组与对照组均无明显差异，可认为在合理剂量下，临床长期应用Ｇｅ－１３２是安全的。     

8-羟基喹哪啶固相萃取光度法测定水样中的铁

研究了8-羟基喹哪啶与铁的显色反应，在pH为8．0的氯化氨-氨水缓冲介质中，在十六烷基三甲基溴化铵(CTMAB)存在下，8-羟基喹哪啶与铁反应生成3：1稳定的蓝紫色络合物，该络合物可被Waters Sep-Park-C18固相萃取小柱萃取，用乙醇洗脱后用光度法测定，络合物λmax=600nm。在此波长下其它金属离子的络合物无光吸收，对铁选择性很好，铁含量在0-5mg/L内符合比尔定律，方法用于水样中痕量铁的测定，结果令人满意。     

1,2-丁二醇共聚对聚对苯二甲酸乙二醇酯结晶行为及力学性能的影响

为了探索生物基乙二醇中的1,2-丁二醇(1,2-BDO)作为共聚单体对生物基聚对苯二甲酸乙二醇酯(PET)的结晶行为和力学性能的影响。 本文合成了生物基PET均聚物和不同1,2-BDO共聚单元摩尔分数的系列生物基PET共聚物(共聚单体摩尔分数分别为2.0%、2.7%和5.6%),并采用傅里叶变换红外光谱仪(FTIR)、差示扫描量热仪(DSC)和力学测试等技术手段研究了其结晶行为和力学性能。 结果表明,随着1,2-BDO共聚单元摩尔分数的增加,PET共聚物的熔融温度、结晶速率及结晶度均明显降低,表明1,2-BDO共聚单体的引入破坏了PET分子链的规整性,阻碍了PET链段的结晶。 PET材料的拉伸强度随着1,2-BDO共聚单元摩尔分数的增加而降低,而弯曲强度和弯曲模量略有升高。     

SAPO-34分子筛骨架稳定性的研究

利用差热分析，原位ＸＲＤ技术，高温条件下的焙烧和水蒸气处理并关联其催化性能变化，研究了ＳＡＰＯ－３４分子筛的热及水热稳定性，差热分析结果表明，ＳＡＰＯ－３４的骨架破坏温度高于１３００Ｋ，原位ＸＲＤ跟踪研究证实，ＳＡＰＯ－３４分子筛原粉在高温焙烧以除掉有机胺及随后的降温过程中无明显的骨架破坏；而焙烧型ＳＡＰＯ－３４在空气中放置一定时间后，水分子吸附微孔中明业降低样品的ＸＲＤ峰强度，且降低幅度随放置时     

担体对Fe—MnO催化剂CO＋H2反应性能的影响

考察氧化物担体对Fe-MnO催化剂反应性能影响的结果表明,担体的类型对Fe-MnO催化剂CO加氢反应性能影响很大,其低碳烯烃选择性相差悬殊,Al_2O_3、SiO_2和MgO担载的Fe-MnO催化剂都不利于低碳烯烃的生成,而TiO_2担载的Fe-MnO催化剂则具有较高的烯烃选择性和催化活性。从担体-金属相互作用本质的差异,研究了担体对金属活性组分化学状态的影响及催化活性相与F-T合成烯烃的关系,发现担体-金属间的电子效应有利于催化剂活性和选择性的提高,其它物理化学效应引起的相互作用则不利于改善催化剂性能;还表明Fe_(?)C是催化活性相,Fe~(2+)物种的存在不利于提高烯烃的选择性。     

A nanoscale vesicular polydiacetylene sensor for organic amines by fluorescence recovery

We report a nanoscale lipid membrane-based sensor of conjugated polydiacetylene (PDA) vesicles for fluorescence detection of organic amines. The vesicle sensor was constructed by incorporation of a BODIPY fluorescent dye into the PDA vesicles. The fluorescent properties of the resulting vesicles can be manipulated by adjusting lipid components, and are controlled by environmental and solution conditions. The fluorescence of the BODIPY dye was significantly quenched in the polymerization of diacetylene lipid vesicles by a UV irradiation process. However, it was sufficiently recovered by external stimuli such as a hike of solution pH. The fluorescence recovery process was reversible, and a decrease in solution pH resulted in repeated quenching. The reported system transforms an external stimulus into a large fluorescence intensity change, demonstrating great potential in developing new signal reporting method for biosensor design. The quench-recovery phenomenon of the BODIPY-PDA is believed to be related to the energy transfer between the dye and the PDA conjugate backbone. The vesicle sensor was applied for detecting an organic amine, triethylamine (TEA) and a large linear relationship was obtained between the increase in fluorescence intensity and the concentrations of TEA. The detection limit of TEA by vesicle sensors using fluorescence recovery was found to be 10 μM.     

Detection of antisperm antibody in human serum using a piezoelectric immunosensor based on mixed self-assembled monolayers

A novel piezoelectric immunosensor based on mixed self-assembled monolayers (mixed SAMs) formed by short-chain amine- and carboxyl-terminated thiols has been developed to immobilize antigens onto gold electrodes for detecting antisperm antibody (AsAb) in human serum samples. The properties and the enhanced performance of the affinity biosensor interface based on mixed SAMs are investigated. Most importantly, analytical results of several human serum samples using the developed technique are in satisfactory agreement with those given by the enzyme-linked immunosorbent assay (ELISA) method in the concentration ranging from 32.3 to 300.0 mU/ml. It means the procedure proposed in this paper is likely to have a great potential in research and may play an important clinical role in a few years later.     

Polymer-enzyme conjugates can self-assemble at oil/water interfaces and effect interfacial biotransformations

Native water-soluble enzymes were transformed into interface-binding enzymes via conjugation with hydrophobic polymers, thus enabling interesting interfacial biocatalysis between immiscible chemicals at oil/water interfaces. Such interfacial biocatalysis demonstrated a significantly improved catalytic efficiency as compared to traditional biphasic reactions with enzymes contained in the bulk aqueous phase. Particularly, polystyrene-conjugated beta-galactosidase showed a catalytic efficiency that was more than 145 times higher than that of the native enzyme for a transgalactosylation reaction. It is believed that the improved accessibility of the biocatalysts to chemicals held in both phases across the interface is the key driver for the enhancement of enzyme activity.