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541.
Jiu Yu LIU Hui Yuan GUO* Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences Peking Union Medical College Beijing 《中国化学快报》2004,15(5)
Quinolone antibacterial agents have emerged as one of the dominant classes chemotherapeutic drugs for the treatment of various bacterial infections1. We have focused our attention on the modification of the C-7 basic group of the quinolone which has been most varied. In 1987, Uno et al.2 reported that 3-hydroxypyrrolidine quinolones showed more active antibacterial activities than Norfloxacin in vivo. In 1998, Fujita et al.3 reported that 2-aminomethylpyrrolidine quinolones have the same … 相似文献
542.
Ke Qiang DING Zhen Bin JIA Qing Fei WANG Juan BAI Ru Ting TONG Xin Kui WANG Hui Bo SHAO* Institute of Coal Chemistry Chinese Academy of Science Taiyuan Department of Chemistry Hebei Teachers University Shijiazhuang D 《中国化学快报》2002,13(4)
Recently, the adsorption behavior of protein on solid substrate has attracted much attention for the reason that adsorption on a substrate is the first key step for other further electrochemical investigation1. Meanwhile the free adsorption could provide a relative well-ordered structure, with which some fundamental study could be carried out conveniently2. As we know, the electrochemical impedance spectroscopy (EIS) method has become one of the powerful techniques to detect the change of i… 相似文献
543.
Lanthanum doped lead zirconate titanate (PLZT) ceramics display excellent electrooptic and photostriction properties because of the existence of cavities in the perovskite structure1-3. The PLZT powders are conventionally prepared by solid state reaction4-5, and the wet chemical methods such as sol-gel techniques are then introduced6-7. However, the homogeneity, morphology and size of the particles, which greatly affect the sinterability and the property of the resulting ceramics, are dif… 相似文献
544.
A Theoretical Study on the Stereoisomerism in the Complex of Cucurbit[8]uril with 2,6-Bis(4,5-dihydro-1H-imidazol-2-yl)naphthalene 总被引:2,自引:0,他引:2
Ting Wei MU Lei LIU Ke Chun ZHANG Qing Xiang GUO* Department of Chemistry University of Science Technology of China Hefei 《中国化学快报》2001,(9)
Cucurbit[n]urils (CB [n]),macropolycyclic compounds self-assembled from an acid-catalyzed condensation of glycoluril and formaldehyde1, can form inclusion complexes with a number of organic substrates in water2. Usually, CB [6] is used in the studies because of its easy synthesis, and the driving forces for its binding are considered to be the hydrophobic effect and dipole-dipole interactions. CB[n] 1Very recently, Kim et al reported the synthesis of CB [5], CB [7], and CB [8]3. They fou… 相似文献
545.
The chemistry of samarium (II) iodide (SmI2) is of current interest in organic synthesis. SmI2 has been developed as a powerful, versatile and ether-soluble single-electron reductant and many examples have been reported of its use in the reduction of various functional groups1. Though SmI2 is a useful reagent, storage is difficult because it is very sensitive to air oxidation. On the other hand, metallic samarium is stable in air and has strong reducing power (Sm3+/Sm=-2.41 V). These pr… 相似文献
546.
ZHAO Ganqing XIE Jimin* LU Xiaoqing SUN Lu . College of Chemistry & Chemical Engineering Jiangsu University Zhenjiang China . College of Chemistry Chem. Eng. Pingdingshan University Pingdingshan China 《Chinese Journal of Reactive Polymers》2006,(2)
1. INTRODUCTION The partial oxidation of alkenes (forming acids, aldehydes and alcohols) is of considerable interest to the chemical industry. In most cases, more than one oxygenated product is formed from a given starting material and all products are susceptible to complete oxidation to carbon dioxide and water [1]. As mimetic oxygen carrier or oxidation catalyst, metalloporphyrins have been widly studied [2~7]. Among the non-porphyrin systems, the manganese complexes of Schiff base are… 相似文献
547.
具有辐射聚合能力的HfO2/SiO2溶胶-凝胶玻璃的制备及其X射线光刻性能研究 总被引:1,自引:0,他引:1
采用溶胶-凝胶方法制备了一种新颖的具有辐射聚合能力的HfO2/SiO2凝胶薄膜. 并采用X射线作曝光光源对薄膜进行了曝光, 通过FTIR的测试, 分析了薄膜曝光前后的结构变化. 结果表明, 该材料具有良好的辐射聚合能力. 采用XPS分析了薄膜的成分, 并证实了Hf元素的存在. 用椭偏仪测试了薄膜的折射率, 结果证实, 加入HfO2提高了体系的折射率. 利用其辐射聚合能力, 采用X射线通过掩模板进行曝光, 利用曝光部分与未曝光部分在溶剂中的溶解度差, 在薄膜上制备了高为0.8 μm、周期为1 μm的衍射光栅, 进一步证实了材料具有良好的辐射聚合能力. 相似文献
548.
Tong WU De Yun KONG Hui Ting LI* Shanghai Institute of Pharmaceutical Industry Shanghai 《中国化学快报》2002,13(11)
Helicia nilagirica Beed. belongs to the plant of Proteaceae family. The seeds of the plant is for treatment of insomnia and neurasthenia in Jingpo nationality in Yunnan Province1. Helicid and helicidol were isolated from the seeds of the plant2,3, and the helicid was recorded in the Yunnan Pharmacopoea at the 1987 edition. The chemical constituents of the leaves of this plant has not been reported yet in the literature. This paper is concerning the study of the chemical component of the… 相似文献
549.
Spherical foam growth in Al alloy melt 总被引:6,自引:0,他引:6
The ultra light metal structure, realizing the light-ness and multifunction of structural material, has a bright future in high-tech and civil fields and is be-coming one of the hotspots in developed countries in 21 century[1―8]. Preparing Al foam by mel… 相似文献