腹腔温热灌洗联合术后静脉微泵及置泵区域性动脉灌注化疗综合治疗胃肠道恶性肿瘤

目的:探讨胃肠道癌术后预防腹腔转移及肝转移的有效方法。方法:对157例胃肠道癌切除术后病人,随机分成术中腹腔温热灌洗及术后静脉微泵和置泵持续动脉灌注化疗组72例(简称治疗组),单纯静脉化疗组85例(简称对照组),并对其腹腔转移率、肝转移率及3年生存率进行对照研究。结果:治疗组腹腔转移率21.5%、肝脏转移率13.4%、3年生存率71.6%,对照组腹腔转移率41.2%、肝脏转移率22.6%、3年生存率47.5%。两组之间比较有显著性差异(P<0.05)。结论:术中腹腔温热灌洗及术后静脉微泵和置泵持续动脉灌注化疗,对胃肠道癌病人术后腹腔转移及肝转移有良好的防治作用。

The study of helicon plasma source

Helicon plasma source is known as efficient generator of uniform and high density plasma. A helicon plasma source was developed for investigation of plasma neutralization and plasma lens in the Institute of Modern Physics in China. In this paper, the characteristics of helicon plasma have been studied by using Langmuir four-probe and a high argon plasma density up to 3.9x10(13) cm(-3) have been achieved with the Nagoya type III antenna at the conditions of the magnetic intensity of 200 G, working gas pressure of 2.8x10(-3) Pa, and rf power of 1200 W with a frequency of 27.12 MHz. In the experiment, the important phenomena have been found: for a given magnetic induction intensity, the plasma density became greater with the increase in rf power and tended to saturation, and the helicon mode appeared at the rf power between 200 and 400 W.

板栗内皮对酸性废水中重金属的吸附

选取板栗内皮作为吸附剂,在实验室条件下,通过振荡吸附的方法研究了板栗内皮对pH 2.0的酸性废水中,镉、铅、铜、锌4种重金属离子的吸附特性。研究结果表明,当板栗内皮的加入量为30 g/L,反应时间1 h,达到对溶液中4种重金属离子的最大去除率,分别为Cd 98.9%、Pb 99.6%、Zn 98.9%、Cu 98.7%;热力学实验结果表明,板栗内皮对4种重金属离子的吸附容量分别为Cd 3.2、Pb 90.8、Zn 27.3、Cu 52.4 mg/g;动力学实验结果表明,吸附反应在60 min内可以达平衡。Elovich方程最适合描述板栗内皮吸附重金属离子的动力学行为,板栗内皮对镉、铅、铜、锌4种重金属的吸附速率和吸附时间成反比,同一时刻对4种重金属离子吸附速率大小依次是Pb2+>Cd2+>Cu2+>Zn2+。

九十年代中国景观生态学文献分析及研究进展(英文)

本文通过文献检索对90年代期间景观生态学文献及论著进行了分析。分析结果表明,景观生态学研究在过去十年中获得了突飞猛进的发展。通过不完全统计,中国研究人员在国内外发表有关文献619篇以及中、英文著作13部,其中90% 以上是在国内发表的。基础理论方面和应用方法的文献分别占39.6% (245篇)和23.6% (146篇)。依据不同的研究内容,中国90年代景观生态学研究文献被分为9类。城市景观生态学的文献数量排列第一,占全部统计文献的13.4%;其次是区域、流域景观,寒区、旱区景观,森林景观,生境与生物多样性,农业景观,湿地景观,城郊景观以及植物景观。根据分析结果,作者对中国的景观生态学研究目前存在的问题和发展趋势进行了讨论。表3参42。

内蒙古松树山的植物区系与沙地油松林群落特征

根据多次对内蒙古松树山地区的植物调查资料和沙地油松林群落学的研究,结果表明:(1)松树山在植物区系上,正处在蒙古植物区系、华北植物区系、长白植物区系和达乌里植物区系的交汇地区。植物种类比较丰富,种子植物达394种。松树山植物的科、属、种分别占科尔沁沙地的61.1%、58.1%和41.1%;(2)松树山植物区系地理成分以温带性质成分占绝对优势,占本地区的90.61%,其中以温带亚洲成分、旧世界温带成分和中国-日本成分最多,分别占本地区的16.8%、14.0%和13.7%;(3)沙地油松林是松树山地区和科尔沁沙地唯一的针阔叶混交林类型,群落生活型谱以地面芽植物种类最丰富,占40.7%,其次为高位芽植物(22.2%)和地下芽植物(25.5%)。(4)沙地油松林可划分为沙地胡枝子蒙古栎油松林和沙地山杏油松林2个类型,前者主要分布在石质沙丘上,后者多分布在固定沙丘的阴坡。群落演替进程为沙地先锋植物群落阶段→根茎禾草杂类草群落阶段→沙地灌丛群落阶段→沙地油松林阶段。

青海湖地区芨芨草草地土壤种子库的初步研究

选择青海湖地区的次生芨芨草草地为研究对象,以围栏内封育和围栏外自由放牧的草地做对照,研究了围栏内外土壤种子库的萌发状况、密度和数量、物种多样性,以及土壤种子库与地上植被的关系。结果表明,围栏内外土壤种子库的萌发趋势非常相似,但是萌发种子累计数量不同;围栏内外土壤种子库中萌发种子的平均密度分别为3660和2460粒·m-2,围栏内萌发种子数比围栏外提高了48.8%;围栏内外土壤种子库的物种多样性指数差异较大,围栏内外丰富度指数R1分别为17和13,R2为3.693和2.832,丰富度围栏内大于围栏外,多样性指数和丰富度指数具有相同的规律,均匀度指数围栏内外分别为0.812和0.857,则是围栏外大于围栏内。围栏内外地上植被群落组成存在显著差异,围栏内的封育草地的物种丰富度和多样性指数均大于围栏外的放牧草地,而均匀度指数则呈相反趋势。

低熔点间同1,2-聚丁二烯热塑性弹性体的研究

本论文对异辛酸铁(Fe)-亚磷酸二乙酯(P)-三异丁基铝/三乙基铝(Al)催化体系进行研究, 合成熔点低于130℃的间同1,2-聚丁二烯热塑性弹性体,并且发现三异丁基铝与三乙基铝比例对聚合活性有较大的影响。放大实验合成的间同1,2-聚丁二烯熔点为126℃ ,其1,2-结构含量为84%,间同度为81%；数均分子量13万,重均分子量40万,分子量分布为3.0；300%定伸应力为14.2MPa,拉伸强度20.5MPa,扯断伸长率420%,断裂强度20.4MPa,硬度为94邵尔A,热分解温度435℃,具有良好的力学性能和热稳定性。

Architectures of Strontium Hydroxyapatite Microspheres: Solvothermal Synthesis and Luminescence Properties

Strontium hydroxyapatite (Sr-5(PO4)(3)OH, SrHAp) microspheres with 3D architectures have been successfully prepared through a efficient and facile solvothermal process. The experimental results indicate that the SrHAP microspheres are composed of a large amount of nanosheets, which are assembled in a radial form from the center to the surface of the microspheres. The as-obtained SrHAp samples show an intense and bright blue emission from 350 to 570 nm centered at 427 nm (CIE coordinates: x = 0.153, y = 0.081; lifetime: 9.2 ns; quantum efficiency: 31%) under long-wavelength UV light excitation (344 nm). This blue emission might result from the CO2 center dot- radical impurities in the crystal lattice. Furthermore, the surfactants CTAB and trisodium citrate have an obvious impact on the morphologies and the luminescence properties of the products, respectively.

Hydroxyapatite Nano- and Microcrystals with Multiform Morphologies: Controllable Synthesis and Luminescence Properties

Hydroxyapatite (Ca-5(PO4)(3)OH) nano- and microcrystals with multiform morphologies (separated nanowires, nanorods, microspheres, microflowers, and microsheets) have been successfully synthesized by a facile hydrothermal process. X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL) spectra, kinetic decay, and electron paramagnetic resonance (EPR) were used to characterize the samples. The experimental results indicate that the obtained Ca-5(PO4)(3)OH samples show an intense and bright blue emission under long-wavelength UV light excitation. This blue emission might result from the CO2 center dot- radical impurities in the crystal lattice.

Structural diversity of lanthanide-amino acid complexes under near physiological pH conditions and their recognition of single-stranded DNA

We reported here four structures of lanthanide-amino acid complexes obtained under near physiological pH conditions and their individual formula can be described as [Tb-2(DL-Cys)(4)(H2O)(8)]Cl-2 (1), [Eu-4(mu(3)-OH)(4)(L-Asp)(2)(L-HAsp)(3)(H2O)(7)] Cl center dot 11.5H(2)O (2), [Eu-8-(L-HVal) (16)(H2O)(32)]Cl-24 center dot 12.5H(2)O (3), and [Tb-2(DL-HVal)(4)(H2O)(8)]Cl-6 center dot 2H(2)O (4). These complexes showed diverse structures and have shown potential application in DNA detection. We studied the interactions of the complexes with five single-stranded DNA and found different fluorescence enhancement, binding affinity and binding stoichiometry when the complexes are bound to DNA.

Supramolecular isomerism in zinc hydroxide coordination polymers with pyridine-2,4-dicarboxylic acid: Two polymorphs with centrosymmetric two-dimensional and acentric three-dimensional coordination networks

Reactions of Zn(BF4)(2) and pyridine-2,4-dicarboxylic acid (2,4-pydcH(2)) in the presence of 1,2-bis( 4-pyridyl) ethylene or 1,3-bis(4-pyridyl) propane under hydro(solvo) thermal conditions yielded two polymorphic metal-organic coordination polymers formulated as Zn-2(OH)(2)(2,4-pydc) (1 and 2). Polymorph 1 features a two-dimensional (2-D) layer-like structure that is constructed by 2,4-pydc ligands bridging between the Zn-OH-Zn double-chain units. Each single Zn-OH-Zn chain is composed of mu(2)-OH groups connecting trigonal bipyramidal and tetrahedral Zn centers. Polymorph 2 is a 3-D coordination polymer containing 2-D Zn-OH-Zn sheets that consist of mu(2)- and mu(3)-OH groups and trigonal bipyramidal Zn centers. The sheets are pillared by 2,4-pydc ligands to form an acentric structural architecture. 1 and 2 are rare examples that the two polymorphs exhibit a centrosymmetric 2-D coordination network and an acentric 3-D coordination network, respectively. The different structures lead to differences in photoluminescent properties and thermal stabilities for 1 and 2.

苦参中黄酮类化合物的电喷雾质谱研究

采用电喷雾多级串联质谱对苦参中黄酮类化合物二氢黄酮及二氢黄酮醇类化合物的特征质谱行为进行了研究 .实验结果表明 ,两类化合物在电喷雾多级串联质谱条件下均可以在 C环发生开环断裂 ,但断裂的位点不同 ;两类化合物生成的碎片离子也有很大差异 ,提出了由二氢黄酮醇类化合物 C环上 3位连接的— OH所诱发的不同反应过程的质谱碎裂机理

Computer simulation of Gd(III) speciation in human interstitial fluid

The speciation and distribution of Gd(III) in human interstitial fluid was studied by computer simulation. The results show that at the background concentration, all the Gd(III) species are soluble and no precipitates appear. However as the total concentration of Gd(III) rises above 2.610 x 10(-9) mol/l the insoluble species become predominant. GdPO4 is formed first as a precipitate and then Gd-2(CO3)(3). Among soluble species, free Gd(III), [Gd(HSA)], [Gd(Ox)] and the ternary complexes of Gd(III) with citrate as the primary ligand are main species when the total concentration of Gd(III) is below 2.074 x 10(-2) mol/l. With the total concentration of Gd(III) further rising, [Gd-3(OH)(4)] begins to appear and gradually becomes a predominant species.

Syntheses, crystal structures and magnetic properties of two heterometallic coordination polymers

Two heterometallic chain coordination polymers with the chemical formula {[Cu2Mn2L2(CH3OH)(H2O)] center dot 0.5CH(3)OH center dot 0.5CH(3)CH(2)OH}(n) (1) and {[Cu2Co2L2(H2O)(2)] center dot H2O}(n) (2) have been synthesized and characterized by IR, UV spectroscopy and single-crystal X-ray structural analysis, where H4L = 2-hydroxy-3-[(E)-({2-[(2-hydroxybetizoyl)amino]ethyl}imino)methyl] benzoic acid. Magnetic measurements showed that the two compounds exhibit antiferromagnetic coupling exchange interactions, and satisfactory fittings to the observed magnetic susceptibility data were obtained by assuming a linear four-spin arrangement with two isotropic magnetic exchange interactions.

Computer simulation of Gd(III) speciation in human interstitial fluid

The speciation and distribution of Gd(III) in human interstitial fluid was studied by computer simulation. Meantime artificial neural network was applied to the estimation of log beta values of complexes. The results show that the precipitate species, GdPO4 and Gd-2(CO3)(3), are the predominant species. Among soluble species, the free Gd(III), [Gd(HSA)], [Gd(Ox)] and then the ternary complexes of Gd(III) with citrate arc main species and [Gd-3(OH)(4)] becomes the predominant species at the Gd(III) total concentration or 2.2x10(-2)mol/L.