微生物灭钉螺研究现状

介绍有关微生物灭钉螺方法和途径的研究现状，分别叙述了一般微生物灭螺试验及效果，并简要说明了灭螺微生物的初筛和两种微生物杀螺常用的实验方法，初步探讨了灭螺机理及对今后工作的意见。     

FirstIdentificationofLevelSchemesinNeutron─richIsotopes141Xe，152Ceand160Sm

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Adsorption of Xe in zeolite MCM-22

Adsorption of xenon in zeolite MCM-22, a zeolite containing two separate pore systems，has been investigated in detail by variable temperature (VT) ¹²⁹Xe NMR spectroscopy. NMR results suggest that Xe atoms are preferentially adsorbed in the supercages of the zeolite at low Xe pressure (less than a few atmosphere), while Xe atoms can penetrate into the two-dimensional sinusoidal channels at high Xe pressure. Exchange of xenon at the different adsorption sites in the same supercage, i.e. xenon atoms in the two pockets and those in the central part of the supercage, was confirmed at 145 K by two-dimensional (2D) ¹²⁹Xe NMR exchange spectroscopy. The time scale for the exchange is about several milliseconds.     

Molecular dynamics study on the structure Ⅰ xenon hydrate

A 368 water molecule structure Ⅰ gas hydrate encased with 22 xenon molecules have been calculated by molecular dynamical simulations. The potential TIP4P was used for water interactions and Lennard-Jones for Xe-Xe and Xe-water interactions. There is a fiat region and a local mininum between 75.0 and 100 K in the potential energy curve. Glassy phase transition for Xe hydrate is predicted in this region by analyzing anomalous heat capacity, phonon density of states, and radial distribution functions.     

平面型氙准分子灯特性及其在降解水相枣红中的应用

研究了平面型氙准分子灯的真空紫外(VUV)辐射特性,电源电压、频率和充气压强对辐射强度和效率均有影响.研究表明在正弦电压驱动下,充气压3×104Pa左右时有最佳辐射强度和效率.在本实验中用于水处理实验的氙准分子灯参数为电压4kV,频率20kHz,气压3.8×104Pa,对应的辐射功率为25.4mW(光子流量2.2×10-6einstein·min-1).选用偶氮类染料枣红作为被分解物质,发现氙准分子灯的172nm辐射能够有效地使枣红解离,解离反应呈准一级反应,解离速率为9.28×10-8mol·min-1,光量子产额4.2×10-2mol·einstein-1.有机物初始浓度、溶液pH值、光强等都会对解离率产生影响.在氙准分子灯和反应溶液不直接接触时,发现解离率和COD(化学需氧量)去除率并不一直随着光强增加而增大,而有一最佳值.     

两组浓度的蛋白酶体抑制剂MG132诱导人宫颈癌细胞Hela凋亡

为了探讨不同浓度蛋白酶体抑制剂MG132在诱导人宫颈癌Hela细胞凋亡过程中作用,分别以两组浓度的蛋白酶体抑制剂MG132处理人宫颈癌细胞Hela,通过MTT法检测Hela细胞活力,应用AnnexinⅤ和PI双染的细胞流式法检测Hela细胞凋亡率,应用Western blotting和酶标仪法检测Hela细胞内Caspase-3活性变化的情况.结果表明:低浓度MG132诱导Hela细胞凋亡不明显,高浓度MG132诱导Hela细胞凋亡明显;不同浓度蛋白酶体抑制剂MG132诱导人宫颈癌Hela细胞凋亡的程度存在明显差异.     

13~2-氧代焦脱镁叶绿酸-a甲酯的E-环反应及其最大可见光吸收波长的变化

以132-氧代焦脱镁叶绿酸-a甲酯1为起始原料,在碱性条件下重排成红紫素-18甲酯2,继续与盐酸羟胺的酰胺化反应得到红紫素-18内酰胺3;1与邻苯二胺的缩合反应生成苯并咪唑并红紫素-18甲酯4,与重氮甲烷的Tiffeneau-Demjanov重排反应分离出维尔啶(verdins)衍生物5.对132-焦脱镁叶绿酸-a甲酯1的外接E-环反应机理进行讨论,并解释和总结了所得叶绿素类二氢卟吩的最大可见光吸收波长的变化原因及规律.     

^132Xe核的微观sdgIBM—2描述

本文从壳模型组态和核子－核子相互作用出发，借助Ｄｙｓｏｎ玻色子展开，ＭＪＳ代换和适当定义的具体有很强集体性的玻色子。     

Molecular dynamics study onthe structure I xenon hydrate

Gas hydrates (GHs) are multi-component crystalline compounds with structures consisting of water molecules and encasing gas molecules[1]. There are three types of natural GHs, called structure I, structure II and structure H.[2]. Simple gases such as methane, xenon (Xe), etc. are hydrophobic and can be trapped into water cages to form structure I GHs[2]. It is found that Xe are present in the samples from hydrate ridge, Cascadia Margin[3]. Xe hy-drate is especially suited for study of X…