过氧化氢和磷酸对以亚磷酸作磷源合成SAPO-41和AlPO-41的影响

 考察了以亚磷酸作为磷源合成SAPO-41和AlPO-41时加入过氧化氢或磷酸对生成SAPO-41和AlPO-41的影响. 结果表明,向反应体系中加入过氧化氢或者使用磷酸部分替代亚磷酸,都能明显缩短SAPO-41和AlPO-41的晶化时间. 此外,使用混合磷源还能够降低模板剂的用量,获得小晶粒晶化产物.     

一种新型磺化聚醚醚酮的合成、表征和性能

以特丁基对苯二酚、3,3′-二磺酸钠基-4,4′-二氟二苯酮和4,4′-二氟二苯酮为单体,制备了具有高磺化度的聚醚醚酮.该系列聚合物可溶,并具有良好的成膜性.对聚合物及其膜的一些性能进行了研究.     

任播网络录用概率的平稳分析

任播服务在IPv6[1]中定义为一种标准的网络服务，它获得了越来越广泛的应用，已成为一种十分重要的网络服务．其研究虽已获得不少结果。但有关其服务质量之严格的数学分析并不多见．本文对[2，3][所建立的任播网络系统(ED，1)。(WD／D H，1)，和(WD／D B，1)进行了平稳分析．给出了这些系统在平稳条件下录用概率和拒绝概率的解析表达式．     

治疗风湿性关节炎蒙药中多种微量元素的ICP-AES测定

蒙药中有多种氨基酸和丰富的微量元素,特别是人体必需的微量元素量相对高,而对人体有害的重金属元素量相对低。采用微波消解ICP-AES法同时测定了治疗风湿性关节炎的组合蒙药(1#早服、2#午服、3#晚服)中Ca、Mg、Al、Fe、Mn、Sr、Cu、Zn、Pb等15种金属元素。加标回收率94.88%~106.21%,相对标准偏差RSD≤3.6%,检出限≤0.009μg/L。实验结果表明;1#、2#、3#为不同类型的蒙药,其微量元素量有所不同。     

零价铁/无定形磷酸钙复合物的合成及其对CdTe量子点吸附性能

在氮气保护下利用共沉淀方法成功地合成了零价铁无定形磷酸钙复合物（Fe⁰/ACP复合物）,并采用XRD、EDAX和FTIR对产物进行了表征。同时通过SEM和TEM分析可知所合成材料的粒径为300 nm左右。磁滞回线表明在磁场中可以将该复合物从非磁性材料中分离出来。氮气吸附脱附曲线表明所合成材料具有吸附性能。此外所合成Fe⁰/ACP复合物被用来吸附CdTe量子点,并采用二级动力学方程对吸附过程进行了分析。吸附产物采用XRD、FTIR、荧光和磁滞回线进行了表征,结果表明该吸附产物不仅具有磁性,而且具有很好的荧光性质。     

Cu-ZnO-CeO2催化剂组成对CO2加H2合成甲醇性能的影响

采用并流沉淀法分别制备了CuO-CeO₂（物质的量比为5：1）、CuO-ZnO（物质的量比为5：4）、CuO-ZnO-CeO₂（物质的量比为5：4：1）三组目标催化剂,通过X射线衍射（XRD）、氢气升温还原（H₂-TPR）、CO₂程序升温脱附（CO₂-TPD）、氮气吸附-脱附、X射线光电子能谱（XPS）、N₂O滴定表征技术对催化剂的物化性能进行了测试,并在高温高压微催化反应器中对催化剂进行活性评价。研究了CuO-ZnO-CeO₂组成对CO₂加氢合成甲醇的影响。结果表明,与二组分催化剂相比较,三组分CuO-ZnO-CeO₂催化剂物化性能及催化活性发生了很大变化,催化剂表面碱性位增强,热稳定性增强,CuO颗粒粒径变小,铜分散度以及氧空位浓度提高,最终催化活性显著提高。其中,CuO-ZnO-CeO₂催化剂中,CuO颗粒粒径为8.2nm,铜的比表面积为68.4m²/g,铜分散度为7.19%,甲醇的选择性和收率分别为48.6%和0.057mmol/（g·min）,催化剂活性较好。     

Investigation of the interaction of Mercurochrome® constituents with proteins using liquid chromatography/mass spectrometry

The interaction of Mercurochrome®, a medical preparation based on the mercuryorganic compound merbromin, with free thiols in low molecular weight peptides and in proteins has been investigated by means of liquid chromatography (LC) and electrospray mass spectrometry (ESI-MS). β-Lactoglobulin A (β-LGA) from bovine milk (18.4 kDa) has been used as the model protein. It was found that, in contrast to assumptions in literature, the commercial product itself is a heterogeneous mixture of moderate chemical stability, which may contain precipitated Hg salts depending on storage time and conditions. Further variability results from different degrees of bromination of the fluorescein backbone of the compound. The formation of mercury compound–protein adducts was detected. The peptide sequence T13 containing a free thiol residue was identified as the binding site for mercury species after tryptic digestion of β-lactoglobulin A. While fresh Mercurochrome® tends to the formation of a Hg(II)-β-LGA adducts due to excess Hg²⁺ in solution, investigations after precipitation of Hg salts yield Hg(merbromin)(β-LGA) as the major product.     

On-line electrochemistry/liquid chromatography/mass spectrometry for the simulation of pesticide metabolism

On-line electrochemistry/liquid chromatography/mass spectrometry (EC/LC/MS) was employed to mimic the oxidative metabolism of the fungicide boscalid. High-resolution mass spectrometry and MS/MS experiments were used to identify its electrochemical oxidation products. Furthermore, the introduction of a second electrochemical cell with reductive conditions provided important additional information on the oxidation products. With this equipment, hydroxylation, dehydrogenation, formation of a covalent ammonia adduct, and dimerization were detected after initial one-electron oxidation of boscalid to a radical cation. On-line reaction with glutathione yielded different isomeric covalent glutathione adducts. The results of the electrochemical oxidation are in good accordance with previously reported in vivo experiments, showing that EC/LC/MS is a useful tool for studying biotransformation reactions of various groups of xenobiotics.