Preparation of Co3O4 Nanofibers via an Electrospinning Technique

Thin PVA/cobalt acetate composite fibers were prepared by using sol-gel processing and electrospinning technique.After calcination of the above precursor fibers,Co3O4 nanofibers with a diameter of 50-150 nm could be successfully obtained.The fibers were characterized by SEM,FT-IR,WAXD,respectively.     

Cesium lead halide perovskite nanocrystals for ultraviolet and blue light blocking

Using cesium lead halide perovskite nanocrystals, CsPb(Cl/Br)_3, as a light absorber, we report a highly effective UV and blue light blocking film. The CsPb(Cl/Br)_3 nanocrystals are well dispersed in the ethyl cellulose(EC) matrix to compose a UV and blue light shielding film, and the absorption edge of the film is tunable by adjusting Cl to Br ratio using anion exchange. The CsPbCl_2 Br-EC film exhibits a transmittance of 5% at 459 nm, 90% at 478 nm and 95% in the range of 500–800 nm, which makes it excellent for UV and blue light shielding. In addition, the as-prepared EC-CsPb(Cl/Br)_3 film shows excellent photostability under UV irradiation. Results demonstrate that this EC-CsPb(Cl/Br)_3 based materials with sharp absorbance edges, tunable blocking wavelength, and high photostability can be useful for the applications in UV and blue light blocking and optical filters     

聚乙烯醇非均相法环氧乙烷衍生化反应的研究

采用聚乙烯醇与环氧乙烷非均相加合反应合成了不同环氧乙烷结合量的羟乙基化聚乙烯醇（ＨＥＰＶＡ）．在通过１３Ｃ－ＮＭＲ和ＩＲ对产物进行表征的基础上，讨论了反应与ＰＶＡ空间立构性及结晶性间的关系，证明了ＨＥＰＶＡ中聚氧乙烯链的存在，且其含量增长速率随反应深度的增加而增大．     

SPORES AND POLLEN IN CRUDE OILS AND PETROLEUM SOURCE OF TARIM BASIN

One hundred and forty-seven species of spores and pollen referred to 77 genera found in the crudeoil samples taken from four petroliferous provinces of the Tarim Basin of Xinjiang Provincehave been studied in this paper. By means of these spore and pollen fossils, the geological ages anddistribution of the petroleum source rocks of the basin are judged. Also, the principles and methodsto judge the petroleum source of a petroleum province by spore/pollen and other microfossils in crudeoils are explained.     

微量吸附量热技术在NH2-SBA-15合成中的应用

采用共价接枝法, 以氨丙基-三乙氧基硅烷为氨源, 制备了一系列的NH2-SBA-15催化剂, 通过微量吸附量热技术定量地分析了该催化剂表面碱性中心的强度、数量和分布状态. 实验结果表明, SBA-15在 550 ℃焙烧6 h, 氨基硅源与SBA-15质量比为1.5, 是合成NH2-SBA-15催化剂最适宜的条件. 运用微量吸附量热技术实现了对NH2-SBA-15催化剂合成条件的优化.     

Design,synthesis and biological activity of novel herbicides targeted ALS(Ⅻ)--Quantitative structure-activity relationships of herbicidal l,2,4-triazolo[l,5-a]pyrimidine-2-sulfonanilides

The herbicidal activities of a series of 1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonanilides containing various substituents on the benzene ring were quantitatively analyzed with physicochemi-cal parameters by using Hansch-Fujita method.Variations in the activity were parabolically related to electronic parameters with the optimum pKavalue being about 6.93.The hydrophobic factor in addition to the electronic property seemed to have important effect on the activity.     

聚甲基丙烯酸甲酯单分子膜的原子力学显微镜研究

报道了利用原子力显微镜（ＡＦＭ）技术对聚甲基丙烯酸甲酯（ＰＭＭＡ）单分子膜进行分子结构水平的观察研究．由ＡＰＭ图像中得到的ＰＭＭＡ单体所占面积与用π－Ａ曲线中换算出液面上ＰＭＭＡＬａｕｇｍｕｉｒ膜中单体的面积符合得很好．从ＡＦＭ图像中可见ＰＭＭＡＬＢ膜中ＰＭＭＡ的线型碳链是与档板（ｂａｒｒｉｅｒ）平行的紧密排列，与ＬＢ提膜方向相垂直．并由此对ＰＭＭＡＬＢ膜的形成过程进行分析．此外，还观察到了在Ｓｉ基底上ＰＭＭＡ直链的卷绕伸直排列形态，初步分析了其形成原因．     

富锌排铅咀嚼片安全性毒理学评价

对富锌排铅咀嚼片(RZLR)进行了急性毒性试验、Ames试验、骨髓微核试验、精子畸形试验和30 d喂养试验。结果表明,小鼠急性毒性LD50(BW)>21 500 mg/kg,属无毒级;Ames试验、小鼠骨髓微核试验、精子畸形试验和30 d喂养试验结果均为阴性;30 d喂养试验也未显示明显毒性。本研究证实RZLR是一种安全、无毒副作用的保健食品。     

褪黑激素的合成与表征

以吲哚为起始原料,经4步反应合成了褪黑激素(MLT) 吲哚(1)在甲醇中羟基化得到5-羟基吲哚(2),(2)同2-氯乙胺在乙酸乙酯中进行胺乙基化反应得到5-羟基色胺(3),(3)与硫酸二甲酯在甲苯中对羟基进行醚化,得到5-甲氧基色胺(4),(4)经乙酰化得到产物MLT,收率80%     

辣根过氧化物酶对心肌线粒体过氧化损伤的保护作用

以黄嘌呤氧化酶／次黄嘌呤自由基诱生系统建立了稳定的离体心肌线粒体的损伤模型，并应用此模型研究辣根过氧化物酶对心肌线粒体自由基氧化损伤的保护作用，结果表明，辣根过氧化物酶能抑制心肌线粒体中氧自由基的形成，降低膜脂的过氧水平，保护了线粒体膜酶活性，有效地防止自由基对线粒体结构和功能的损伤。