热电厂废水在库布其沙地农业利用的生态效应分析

采用野外现场生态调查、实验室分析和现场模拟相结合的方法,研究了电厂废水农业利用可能带来的环境问题。结果表明,以目前达拉特电厂的水质状况,在库布其沙地进行合理的农业利用,在可以预见的时间内(20a),不会导致土壤盐渍化和重金属污染现象的发生,因此,电厂废水的农业利用是可行的。

SHACAL-2算法的差分故障攻击

该文采用面向字的随机故障模型,结合差分分析技术,评估了SHACAL-2算法对差分故障攻击的安全性。结果显示:SHACAL-2算法对差分故障攻击是不免疫的。恢复出32 bit子密钥的平均复杂度为8个错误密文,完全恢复出512 bit密钥的复杂度为128个错误密文。

中国穿山甲细菌人工染色体文库的构建及其特征鉴定

鳞甲目 （Pholidota）作为真兽亚纲18个现生目之一，是理解哺乳动物系统分类和进化的一个关键类群。穿山甲的形态十分特殊，它的系统发生地位历来就是人们关注的对象，搞清穿山甲的系统发生地位将有助于理解和重建整个哺乳动物的系统发生过程。目前，中国穿山甲已被列入“哺乳动物基因组计划”24个待测序物种其中之一。细胞遗传学的研究表明中国穿山甲的核型具有多态性。 细菌人工染色体 （BAC）文库目前已成为基因组学研究领域的最为重要的研究工具之一。各种动植物细菌人工染色体文库的逐渐丰富为后基因组时代比较基因组研究奠定了良好的基础。中国穿山甲基因组DNA文库的构建将有力地促进穿山甲染色体演化、哺乳动物比较基因组学及其系统发育学的研究。 本研究在世界上首次成功地构建了一个具有约8倍基因组覆盖率的中国穿山甲细菌人工染色体文库。该基因组文库含有208,512个克隆，储存在543块384孔板中。对随机选取的171个克隆的Not1酶切和脉冲场电泳结果分析显示: 64.5%的克隆插入片段大小介于100-149 Kb之间， 75.6%的克隆插入片段大于100kb。平均插入片段大小为111.4Kb; 非重组克隆 （无插入片段）的比率为9.9%。同时，我们通过荧光原位杂交把105个BAC克隆定位到了中国穿山甲染色体上的特异区域, 构建了中国穿山甲的BAC细胞遗传学图谱。初步的染色体定位结果表明，BAC克隆在基因组中的分布没有偏向性。 中国穿山甲BAC文库的成功构建，丰富了哺乳动物基因组文库资源。该文库除有利于比较基因组研究之外，也为深化保护遗传学研究奠定了基础。BAC细胞遗传学图谱的构建，将为中国穿山甲全基因组测序中产生的序列重叠群在染色体上的定向和定位奠定基础。

Preparation and characterization of Gd2O3:Eu3+ luminescence nanotubes

The size controllable Gd2O3:Eu3+ luminescence nanotubes were successfully prepared using a simple method by coating gadolinium compounds on the carbon nanotubes and then firing the carbon nanotubes. The morphology of the obtained Gd2O3:Eu3+ nanotubes was determined by transmission electron microscopy (TEM). It was found that the obtained nanotubes have the outer diameters of similar to 100 nm, the inner diameters of similar to 50 nm, and the lengths of several tens of microns. The sizes of Gd2O3:Eu3+ nanotubes can be easily controlled by changing the reaction times and the concentration of reactants.

Synthesis and crystal structure of a novel compound: [H3PMo12O40][CO(NH2)(2)](3)center dot-5H(2)O

The title compound, [H3PMo12O40][CO(NH2)(2)](3). 5H(2)O, was synthesized and characterized by IR, C-13 NMR and X-ray diffraction. This is the first example of a urea-heteropoly acid species. Crystal data: monoclinic, C2/c, a = 17.790(4) Angstrom, b = 17.158(3) Angstrom, e = 25.512(5) Angstrom, beta = 100.65(3)degrees, V = 8514(3) Angstrom (3), Z = 6, R-1 = 0.0437, wR2 = 0. 1092. In the unit cell, the urea molecules occupy cavities in the polyoxometalate lattice ordered along b-axis. Water molecules occupy the space left by polyoxometalates, and urea. Polyoxometalate O atoms, the N atoms of urea and O atoms of water molecules are involved in hydrogen bonding. (C) 2001 Elsevier Science B.V. All rights reserved.

Catalytic oxidation of cyclohexene to cyclohexanone by a triple system in acidic aqueous acetonitrile medium

The catalytic oxidation of cyclohexene to cyclohexanone using Pd(OAc)(2)/HQ/FePc was investigated in an acidic aqueous solution of acetonitrile. The role of each component of this system in the oxidation of cyclohexene was explored by means of UV-VIS, IR, XPS spectroscopy and. cyclic voltammetry, respectively. Based on the experimental results, the mechanism of the oxidation of cyclohexene catalyzed by Pd(OAc)(2)/HQ/FePc was elucidated.

Catalysis of the rare earth containing mixed oxides Ln(2)CuO(4) in phenol hydroxylation

Mixed oxides Ln(2)CuO(4+/-lambda)(Ln = La, Pr, Nd, Sm, Gd) with K2NiF4 structure were prepared. Their crystal structures were studied with XRD and IR spectra. Meanwhile, the average valence of Cu ions and nonstoichiometric oxygen (lambda) were determined through chemical analyses. Catalysis of the above-mentioned mixed oxides in the phenol hydroxylation was investigated. Results show that the catalysis of these mixed oxides has close relation with their structures and composition. Substitution of A site atom in Ln(2)CuO(4+/-lambda) has a great influence on their catalysis in the phenol hydroxylation.

ASYMMETRIC ALKYLATION MEDIATED BY CHIRAL PHASE-TRANSFER CATALYSTS

Seven chiral phase-transfer catalysts, among which three have not been reported so far, have been prepared and applied to the asymmetric alkylation of alpha-isopropyl benzyl cyanide and alpha-isopropyl-p-chlorobenzyl cyanide. The result showed that short reaction time, low temperature, high catalyst concentration and non-polar solvent would improve the optical yield. The influence of structure of the catalyst on the asymmetric reaction was preliminarily studied. The optical purity of the products were evaluated by gas chromatography with a chiral column.

使用手性相转移催化剂的不对称烷基化反应

本文报道了用七种手性相转移催化剂(其中三种未见文献报道)催化氯化苄或溴丁烷对α-异丙基对氯苯乙腈或α-异丙基苯乙腈的不对称烷基化反应.考察了反应时间、温度、催化剂浓度和溶剂的极性等因素对不对称反应的影响.不对称烷基化产物的最大e.e.值达41.5%,由比旋光度和带手性柱的气相色谱法测得.

NdP_5O_(14)晶体的光谱强度参数

关于高稀土浓度化学计量比的稀土五磷酸盐晶体已为人们所熟知，国内外NdP_3O_(14)晶体已用作微小型激光器的工作物质。但对稀土五磷酸盐晶体的光谱参数报告得不多。我们生长

Permanent Genetic Resources added to Molecular Ecology Resources Database 1 May 2009-31 July 2009

This article documents the addition of 512 microsatellite marker loci and nine pairs of Single Nucleotide Polymorphism (SNP) sequencing primers to the Molecular Ecology Resources Database. Loci were developed for the following species: Alcippe morrisonia morrisonia, Bashania fangiana, Bashania fargesii, Chaetodon vagabundus, Colletes floralis, Coluber constrictor flaviventris, Coptotermes gestroi, Crotophaga major, Cyprinella lutrensis, Danaus plexippus, Fagus grandifolia, Falco tinnunculus, Fletcherimyia fletcheri, Hydrilla verticillata, Laterallus jamaicensis coturniculus, Leavenworthia alabamica, Marmosops incanus, Miichthys miiuy, Nasua nasua, Noturus exilis, Odontesthes bonariensis, Quadrula fragosa, Pinctada maxima, Pseudaletia separata, Pseudoperonospora cubensis, Podocarpus elatus, Portunus trituberculatus, Rhagoletis cerasi, Rhinella schneideri, Sarracenia alata, Skeletonema marinoi, Sminthurus viridis, Syngnathus abaster, Uroteuthis (Photololigo) chinensis, Verticillium dahliae, Wasmannia auropunctata, and Zygochlamys patagonica. These loci were cross-tested on the following species: Chaetodon baronessa, Falco columbarius, Falco eleonorae, Falco naumanni, Falco peregrinus, Falco subbuteo, Didelphis aurita, Gracilinanus microtarsus, Marmosops paulensis, Monodelphis Americana, Odontesthes hatcheri, Podocarpus grayi, Podocarpus lawrencei, Podocarpus smithii, Portunus pelagicus, Syngnathus acus, Syngnathus typhle,Uroteuthis (Photololigo) edulis, Uroteuthis (Photololigo) duvauceli and Verticillium albo-atrum. This article also documents the addition of nine sequencing primer pairs and sixteen allele specific primers or probes for Oncorhynchus mykiss and Oncorhynchus tshawytscha; these primers and assays were cross-tested in both species.

Changes in RNA, DNA, protein contents and growth of turbot Scophthalmus maximus larvae and juveniles

The growth potential of turbot Scophthalmus maximus larvae and juveniles was studied using nucleic acid-based indices and protein variables. The experiment was carried out from 4 to 60 days post hatching (dph). A significant increase in instantaneous growth rate during metamorphosis and retarded growth rate during post-metamorphic phase were observed. Ontogenetic patterns of DNA, RNA and protein all showed developmental stage-specific traits. The RNA:DNA ratio decreased up to 12 dph, then increased rapidly till 19 dph and fluctuated until 35 dph followed by a decline to the end. The RNA:DNA ratio was positively correlated with growth rate of juveniles during the post-metamorphic phase, whereas this ratio was not a sensitive indicator of growth during the pre-metamorphic phase and metamorphosis. The protein:DNA ratio showed a similar tendency to the RNA:DNA ratio. Changes of DNA content and protein:DNA ratio revealed that growth of S. maximus performed mainly by hyperplasia from 4 to 12 dph and hypertrophy until 21 dph during the pre-metamorphic larval phase. Growth was dominantly hypertrophical from the early- to mid-metamorphosing phase and hyperplastic thereafter. The results show that the DNA content and protein:DNA ratio can evaluate growth rates of larval and juvenile S. maximus on a cellular level.