Intercalation of Epinephrine with Calf-thymus ds-DNA

Interactions of DNA with various molecules are interesting because of its importance in gene expression process of living cells. Several models for the interaction between DNA and some small molecules have been proposed1-4. We are interested in the possibility of the interaction between DNA/RNA and neurotransmitters, such as dopamine and epinephrine, because these species are very important substances for keeping normal physiological functions of brain and neuro system. However, no report…     

A Novel Acoustic Emission Fiber Optic Sensor Based on a Single Mode Optical Fiber Coupler

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Crystal and Molecular Structure of 1-Phenoxy(α-methyl)acetyl-2-diethylamino-3-phenyl-1,3,2-diazaphospholidin-4-one-2-sulfide

1　INTRODUCTIONAsherbicides,thearyloxycarboxylicacidssuchas2,4-D(2,4-Dichlorophenoxyaceticacid)etc.havenotbeenusedwidelysince1970sbecauseoftheircausingenvi-ronmentalpollutionandinjuriestothecrops.Studiesonthenewtypeofherbicideshavebeendevelopinginrecentyears.Itwasreportedrecentlythatthederivativesofdiazaphospholidinoneorthecorrespondingthionespossessinterestingherbicidalactiv-ity[1～3].Itwasalsoknownthat1,4,2-diazaphospholidine-5-thione-2-oxideshasgoodselectiveherbicidalactivity[4,5],but…     

New Soluble Fluorinated Polyimides

Aromatic polyimides have been widely used in aerospace, electrical and electronic applications due to their outstanding thermal stability, mechanical strength at elevated temperature and electrical properties1-3. However, polyimide materials are usually difficulty to fabricate owing to their insolubility in most organic solvents and infusibility. Besides solubility, low moisture uptake of polyimide is also a major concern for microelectronics and optical applications. The present article descr…     

Crystal Structure of Ethyl 4-benzoyl-1a,2,3,4-tetrahydro-3-methyl-1a-(4-methylphenyl)-1H-azirino〔1,2-a〕〔1,5〕 benzodiazepine-1-carboxylate(C_(28)H_(28)N_2O_3)

１ＩＮＴＲＯＤＵＣＴＩＯＮＢｅｎｚｏｄｉａｚｅｐｉｎｅｃｏｍｐｏｕｎｄｓａｒｅｉｍｐｏｒｔａｎｔｐｈａｒｍａｃｅｕｔｉｃａｌａｇｅｎｔｓ〔１,２〕．Ｒｅｃｅｎｔｌｙｉｔｈａｓｂｅｅｎｆｏｕｎｄｔｈａｔｂｅｎｚｏｄｉａｚｅｐｉｎｅｔｒｉｃｙｃｌｉｃｄｅ...     

Synthesis and Crystal Structure of a Mixed Cu - Cd Bim etallic Com plex ｛〔 Cu Cd(pba)( H_2 O)_3〕·2 H_2 O｝ _n

１　ＩＮＴＲＯＤＵＣＴＩＯＮＨｅｔｅｒｏｍｅｔａｌｐｏｌｙｎｕｃｌｅａｒｃｏｍｐｌｅｘｅｓｈａｖｅｂｅｅｎｔｈｅｓｕｂｊｅｃｔｏｆｍａｎｙｒｅｃｅｎｔｓｔｕｄｉｅｓｔｏｅｌｕｃｉｄａｔｅｔｈｅｍｅｃｈａｎｉｓｍｏｆｓｐｉｎｃｏｕｐｌｉｎｇｂｅｔｗｅｅｎｔｈｅｍｅｔａｌｉｏｎｓ〔１,２〕,ｍｉｍｉｃｋｉｎｇｔｈｅａｃｔｉｖｅｓｉｔｅｏｆｓｏｍｅｍｅｔａｌｅｎｚｙｍｅｓｃｏｎｔａｉｎｉｎｇｄｉｓｓｉｍｉｌａｒｍｅｔａｌｉｏｎｓ,ｓｕｃｈａｓｃｙｔｏｃｈｒｏｍｅｏｘｉｄａｓｅａｎｄｓｕｐｅｒｏｘｉ…     

苯酚在热氧化法制备的SnO2/Ti 电极上的电氧化研究

A SnO₂/Ti electrode prepared by thermal oxidation was used as the anode for galvanostatic electrolysis in acidic solution containing phenol, the time-dependances of phenol concentration,chemical oxygen demand in solution(COD)and instantaneous current efficiency were determined during electrolysis.The results show that with the SnO₂/Ti anode instead of Pt,the COD significantly decreases at the same charge passage, and average current efficiency of oxidation increases by three times The mechanism for phenol oxidation at two electrodes was discussed.     

网状多级孔结构氧化铁的制备、合成机理及其光催化性质

以九水合硝酸铁为原料, 利用改进的聚合诱导胶体聚集(PICA)的方法制备出三维网络状多级孔结构氧化铁(HPH). 此结构的制备关键是在合成过程中尿素和甲醛聚合生成脲醛树脂(UF). 脲醛树脂一方面在铁的羟基氧化物生长过程中与之杂化形成杂化产物Fe-UF, 另一方面则进一步聚合, 形成脲醛树脂微球(UFM). 脲醛树脂微球作为模板诱导杂化产物Fe-UF在其表面的聚集. 微球与微球之间则由于表面存在的脲醛树脂间的聚合会相互交联形成网络状结构. 经过煅烧处理后, 脲醛树脂及脲醛树脂微球的分解导致不同尺寸孔结构的生成. 光催化研究结果表明, 产物对罗丹明B的降解效率是商用纳米氧化铁的4倍.     

单分子结的构筑及分子电导性质的测试

分子电子学已成为21世纪研究的热点. 通过将具有特定功能的分子连接在纳米尺度金属电极之间从而构筑包括分子导线、开关、整流器在内的各种分子尺度电子器件, 这引起了科学家们广泛的研究兴趣. 在分子电子学研究中, 构筑金属/分子/金属(MMM)分子结是研究分子器件中电子传输性质的关键. 尽管已经取得了很大的进展, 目前在纳米尺度下构筑稳定可靠的MMM分子结并测试单个分子的电学性质仍然面临很多挑战. 本文着重对单分子电学性质的测试技术和相关理论研究的最新进展以及存在的挑战做了概述.