四川地区宫颈癌组织HPV18和HPV45 E6基因突变分析

采用聚合酶链反应技术对四川地区2003~2004年收集的60例宫颈癌患者的癌组织DNA进行人乳头瘤病毒(HPV) E6基因扩增, 获得HPV18和45型E6基因. 序列分析发现, 18型三例E6基因有同样的两处同义突变; 45型两例E6基因发生突变, 一例有两处碱基突变, 另一例发生六处碱基突变, 其中两处涉及氨基酸变化, 均位于E6抗原决定簇区. HPV45型E6基因中134位c→t, 157位c→t, 259位g→t和341位t→c的碱基点突变未见报道. 另外， 该地区HPV18和45型突变株之间存在碱基互变,  它们之间的最小差异比野生型HPV18和HPV45之间的差异小4.05%, 该数值比在非洲发现的突变株的要小很多, 该结果支持HPV18和HPV45可能起源于非洲的观点.     

单取代多金属氧酸盐有机亚胺衍生物（N-Bu4N）2[Mo6O18（=NAr）]（Ar=o-CH3OC6H4）的合成

采用N,N′-二环已基碳酰亚胺（DCC）脱水法，以（N-Bu4N）2[Mo6O19]：DCC：邻甲氧基苯胺=1．5：1．1：1．0的摩尔比，无水乙腈中加热回流12h，通过丙酮／乙醇溶液重结晶两次，得到橘红色片状晶体．探讨了最佳反应条件：DCC的量在1．0～1．1mmol，反应时间12h．通过元素分析，UV／Vis光谱和^1H NMR谱的研究表明，该晶体是一种新的六钼酸盐的有机亚胺衍生物（N-Bu4N）2[Mo6O18（=NAr）]（Ar=o-CH3OC6H4）.     

单取代多金属氧酸盐有机亚胺衍生物(n-Bu_4N)_2[Mo_6O_(18)(≡NAr)](Ar=o-CH_3OC_6H_4)的合成

采用N,N'-二环已基碳酰亚胺(DCC)脱水法,以(n-Bu4N)2[Mo6O19]∶DCC∶邻甲氧基苯胺=1.5∶1.1∶1.0的摩尔比,无水乙腈中加热回流12h,通过丙酮/乙醇溶液重结晶两次,得到橘红色片状晶体.探讨了最佳反应条件:DCC的量在1.0～1.1mmol,反应时间12h.通过元素分析,UV/Vis光谱和1HNMR谱的研究表明,该晶体是一种新的六钼酸盐的有机亚胺衍生物(n-Bu4N)2[Mo6O18(≡NAr)](Ar=o-CH3OC6H4).     

Stochastic P-bifurcations of a noisy nonlinear system with fractional derivative element

Acta Mechanica Sinica - This paper investigates the stochastic P-bifurcation (SPB) of a fractionally damped oscillator subjected to additive and multiplicative Gaussian white noise. Variable...     

Copper-complex-linked polytungsto-bismuthate (-antimonite) chain containing sandwich Cu(II) ions partially modified with imidazole ligand

Two sandwich-type complexes Na9n(Cu(im)4(H2O)2)1.5n(Cu(im)4(H2O))n[{Cu(im)4}{Na(H2O)2}3{Cu3(im)2(H2O)}(XW9O33)2]2n .(xH2O)n (im=imidazole, X=Bi (1), Sb(2), x=42.5 (1), 40 (2)) have been synthesized and structurally characterized. Basic frameworks of 1 and 2 are built from sandwich-type [{Na(H2O) 2} 3{Cu3(im)2(H2O)}(XW9O33)2](9-) (X=Bi or Sb) anions and [Cu(im) 4](2+) cations. The Cu(2+) and Na(+) ions in the central belt are coordinated by alpha-[XW9O33](9-) units, im, and water molecules to form {CuO4(im)}, {CuO4(H2O)}, and {NaO4(H2O)2} groups in which Cu (2+) ions are partially modified with im ligands. These groups connect alternately forming a six-membered ring including six alpha-[XW9O 33](9-) units. Neighboring anions are further linked by [Cu(im) 4](2+) cations to display an unprecedented anionic chain, which is first observed in sandwich-type tungsto-bismuthate (-antimonite) system. Two kinds of isolated copper complexes and sodium ions are located as counterions, which cause three-dimensional packings of 1 and 2 to present interesting cage structures. The magnetic properties for 1 and 2 both indicate dominant antiferromagnetic interactions among trinuclear Cu(II) clusters.     

Local Poincaré Symmetry in Gauge Theory of Gravity

It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gauge theory does possess local Poincaré invariance.     

多孔球状淀粉接枝共聚物的合成及其性质研究

报道了一种多孔球状淀粉接枝共聚物的合成。此球有很强的机械性能，良好的稳定性和较高的致孔率，平均孔径约为１９．５ｎｍ，以其为载体固定化糖化酶活力为１４６２ＩＵ／ｇ干胶，比活为２９．３１ＩＵ／ｍｇ蛋白。     

Co3O4纳米立方体的可控合成及其CO氧化反应性能

在乙醇和三乙胺的混合溶液中,采用溶剂热法制备了尺寸为10 nm的Co₃O₄立方体. 考察了钴盐前驱体和溶解氧对Co₃O₄纳米立方体结构的影响规律,通过对合成过程中不同阶段产物的结构分析和表征,提出了Co₃O₄纳米立方体的形成机制是溶解再结晶的过程. 将所制备的Co₃O₄纳米立方体在200 ℃焙烧处理后,尺寸和形貌均可保持稳定,但400 ℃焙烧后,变为球形纳米粒子. 这种主要暴露{100}晶面的Co₃O₄纳米立方体催化CO氧化反应的活性低于纳米粒子({111}晶面),验证了四氧化三钴纳米材料在CO氧化反应中的晶面效应.     

Path Integrals and Alternative Effective Dynamics in Loop Quantum Cosmology

The alternative dynamics of loop quantum cosmology is examined by the path integral formulation.We consider the spatially flat FRW models with a massless scalar field,where the alternative quantizations inherit more features from full loop quantum gravity.The path integrals can be formulated in both timeless and deparameterized frameworks.It turns out that the effective Hamiltonians derived from the two different viewpoints are equivalent to each other.Moreover,the first-order modified Friedmann equations are derived and predict quantum bounces for contracting universe,which coincide with those obtained in canonical theory.     

Avalanche Phenomenon of Superthermal Electrons Measured by SDD with New SPHA during ECRH

Two high performance silicon drift detectors （SDD） are installed at the equatorial port with z = 0 and z = -16.4 cm on HL-2A tokamak, respectively. These SDDs combine with the new and non-conventional software pulse height analyser （SPHA ） successfully developed more recently by us to measure the time evolution of soft x-rays spectra, the thermal and superthermal electron temperatures. The high-quality three-dimensional figure of time evolution for soft x-rays energy spectra is easily obtained by combination of a new SPHA and computer. Therefore, the measurement accuracies and the time resolutions of thermal and superthermal electron temperatures are also improved. The enhancement phenomenon of superthermal electron during electron cyclotron resonance heating （ECRH） can be explained by the combination of superthermal electron avalanche theory and experimental parameters.