Formation of Singularities in One-Dimensional Hydromagnctic Flow

Two results on thc formation ofsingularit ies in solutions to the system of onc-dimcusional hydromnagnctic dynamics arc presented.In particular,it is shown that shocks form from a smooth spatial periodic flow in a finitc time if the initial amount s of cntropy and thc "magnetic field" in cach period arc smaller than thosc of sonn waves.A quantitative estimate of blow-up timc is also given.     

The Crystal Structure of 1, 4, 7, 10- Tetraazacyclododecane Hydrate Triperchlorate

1=mTRODUCTIONMacroazacyclicligandisofwideinterestbecauseofitsstructuralsimilaritywiththeskeletonofPOrphyrinringinsomebibectivesubstancessuchaschlorophyllandhemeetc.tl1.Asametalsimulationenzyme,macroazacyclicligandcoordinatedwithtransitionmetalhasbeeninvestigatedthoroghlyinkinetic,dynamicandstructuralcharactert2.3).Butthere'isnorePOrtaboutthecrystalstructureof1,4,7,1o-tetraaza-cyclododecanehydratetriperchlorate.2EXPERIMENTAL2-lSynthesisoftheTitleComplexTetraazacycldodecanewassynthes…     

DNA-binding and photoactivated cleavage of enantiomeric ruthenium(II) complexes

A set of enantiomeric Ru^II complexes Δ- and Λ-[Ru(bpy)₂TAPTP](PF₆)₂(bpy=2,2’-bipyridine, TAPTP=4,5,9,18-tetraazaphenanthreno[9,10-b]triphenylene) have been synthesized and characterized. Binding of both enantiomers to calf thymus DNA has been studied by spectroscopic methods, viscosity, and equilibrium dialysis. The experimental results indicated that both enantiomers bind to DNA by intercalation. Upon irradiation at 302 nm, both enantiomers were found to promote the cleavage of plasmid pBR 322 DNA from supercoiled form I to a nicked form II, and obvious enantioselectively was observed on DNA cleavage, the Λ- enantiomer exhibiting higher cleaving efficiency. The mechanisms for DNA cleavage by the two enantiomers are also proposed.     

Purification and Primary Structure Determination of a Novel Polypeptide Isolated from Mistletoe Viscum coloratum

A novel polypeptide was isolated from mistletoe Viscum coloratum. The primarystructure of the polypeptide ‘named viscotoxin B2‘ was determined to be KSCCKNTTGRNIYNT CRFAGGSRERCAKLSGCKIISASTCPSDYPK by Edman degradation. Viscotoxin B2 shared highsequence homology with viscotoxins isolated from Viscum album. Pharmacological experimentsshowed that viscotoxin B2 had distinct cytotoxic activity on tumor cells. Viscotoxin B2 could beused as a leading compound in cancer therapy.     

基板界面对PS/PMMA溶液共混物溶剂挥发成膜相结构的影响

研究了PS PMMA的共混物溶液溶剂蒸发成膜时的基板界面效应 .利用扫描电子显微镜 (SEM)研究了PS PMMA(5 5 ) (W W) THF高分子共混物溶液在不同基板上通过溶剂挥发成膜的相形态结构 .通过FTIR及ATR FTIR检测了共混物薄膜及其表面的共混组成 .研究结果表明 ,成膜基板对高分子共混物溶液成膜后的相形态有很重要的影响 .控制共混物溶液体系成膜过程中的动力学因素 ,可以调控出所设想的各种复杂的相结构形态     

IgA肾病免疫吸附剂的研究(Ⅰ)

本文采用碳酰二咪唑（N，N'-Carbonyldiimidazole,CDI)为活化剂^[1]，活化琼脂糖载体，并以人免疫球蛋白G（IgG)，为配基制成的免疫吸附剂首次探讨了对高IgA肾病病人血清进行体外清除IgA的实验，吸附率为30－35％，具有一定的清除效果。     

松毛虫性信息素前体(4Z,6E)-十一碳二烯醛的合成

从简单原料乙炔出发, 通过炔对丙烯醛的加成得到7-溴代-(4Z,6E)-庚二烯醛, 经乙二醇保护、Pd催化偶联、水解等步骤立体选择性地得到松毛虫性信息素前体(4Z,6E)-十一碳二烯醛.     

中低温煤焦油重油正庚烷萃余物的反应(甲醛)分离与分析

以陕北中低温煤焦油重油为原料,采用正庚烷溶剂萃取得到煤焦油正庚烷萃余物（H-CT）并与甲醛反应,通过溶剂萃取法将反应后产物（P）分为：正庚烷可溶物（HS-P）、正庚烷不溶甲苯可溶物（HI-TS-P）、甲苯不溶喹啉可溶物（TI-QS-P）和喹啉不溶物（QI-P）。借助GC-MS、FT-IR、TG-FTIR等分析手段,对P的结构组成进行了表征。结果表明,与H-CT相比,P中TI-QS-P组分和氧原子的含量较多,C/H原子比较高;HS-P、HI-TS-P、TI-QS-P和QI-P的含量分别为11.63%、26.42%、57.08%和4.88%;HS-P和HI-TS-P均以中性组分（以芳烃为主）为主,酸性组分（以酚类为主）含量较少,其余为含O、N、S等杂原子化合物;TI-QS-P富集了羰基、亚甲基桥键及稠环芳香化合物,且含酚羟基及芳环取代物,具有较高的热稳定性。     

高效液相法测定紫金红胶囊中朱砂的含量

 建立了用高效液相法 (HPLC)测定中药紫金红胶囊中朱砂含量的方法。朱砂的主要成分为HgS ,通过将样品消化后 ,以二乙基二硫代氨基甲酸钠 (DEDTC)为配合剂 ,再用HPLC对Hg DEDTC的配合物进行分离测定。采用的条件为 :WatersX TerraC1 8柱 ,以甲醇 0 0 1mol/L磷酸氢二钠 (用磷酸调 pH至 7 5) (含 0 0 1 % (质量分数 )DEDTC) (体积比为 73∶2 7)为流动相 ,流速为 0 8mL/min ,检测波长为 2 70nm ,柱温为 35℃。在Hg2 + 质量浓度为 1 0 1mg/L～ 1 0 0 9mg/L时 ,其浓度与Hg DEDTC配合物的峰面积呈良好线性关系 ,相关系数为 0 9996。