唾液IgG抗体测定在幽门螺杆菌感染诊断中的价值

目的 :探讨唾液抗幽门螺杆菌(Helicobacterpylori,Hp)IgG测定对Hp感染的诊断价值。方法 :用ELISA法测定67例Hp阳性及20例Hp阴性患者的唾液内抗HpIgG ,并与血清抗体测定结果比较。结果 :唾液抗HpIgG对Hp感染的敏感性为91 1% ,特异性为85 0% ,准确性为89 7 % ,与血清测定结果接近(分别为92 6 % ,90 0%和91 9 %)。结论 :唾液抗Hp抗体测定对Hp感染的诊断有较好的应用价值。     

湖北省人体旋毛虫病流行与防治现状

目的：摸清湖北省人体旋毛虫病的感染与分布特征以及对人体的危害现状．方法：酶联免疫吸附试验（ELISA）对鄂西南、鄂西北、鄂东南、鄂东北和江汉平原5个片区的21个县、市4 719人进行了人体旋毛虫病血清流行病学调查研究。结果：ELISA人体旋毛虫血清抗体阳性率为12．16％，主要的流行区在鄂西北和鄂东北2个地区。讨论：研究提示目前湖北省的人体旋毛虫病流行仍然严重，制定相应的防治措施应提到议事日程上来．     

马来西亚食蟹猴B病毒相关抗体检查

目的 提供马来西亚食蟹猴B病毒相关抗体阳性率,为我国从马来西亚进行食蟹猴引种提供参考依据.方法 对野外捕捉的1 916只食蟹猴后股静脉采血,低温静置,高速离心、分离血清,用玻片免疫酶法(EIA)和ELISA诊断试剂盒法两种方法对血清进行检测.结果 总的B病毒相关抗体阳性率为68.5%,其中年龄<2岁、2～4岁、4～6岁的B病毒相关抗体阳性率分别为53.0%、63.8%和76.4%.结论 马来西亚食蟹猴B病毒相关抗体阳性率较大;B病毒相关抗体的阳性率是随着年龄的增加而增加;B病毒的感染不受性别的影响.因此在引种过程中应选用年龄较小者.     

福建龙岩规模化猪场BVDV感染的血清学调查

为了解闽西地区规模化猪场牛病毒性腹泻病毒(BVDV)流行情况,应用酶联免疫吸附试验(ELISA)对闽西地区18个猪场送检猪血清进行BVDV感染的血清学调查,同时检测这些猪血清的猪瘟抗体,结果表明:规模化猪场BVDV的感染比较严重,血清阳性率为28.6%,猪场阳性率达到94.4%。种猪、育肥猪、保育猪、哺乳仔猪的BVDV的血清阳性率分别为38.5%、17.3%、2.1%、27.4%,种猪的阳性率明显高于生长猪。BVDV抗体与猪瘟抗体的相关性分析结果表明在猪瘟抗体阳性猪群中的BVDV感染率较高,某些猪瘟抗体阴性猪群中也发现BVDV感染的现象。     

淮南猪肌肉寄生虫病的调查及其检测方法的研究

本文主要做了如下三方面的研究:①应用反向间接血凝试验和酶联免疫吸附试验分别对猪囊虫和旋毛虫抗体进行了检查,从而首次探明了两病在淮南猪群中的流行情况(感染率分别为2.49%、5.91%);②血纸包板、做酶联免疫试验,以测得的OD值来考核滤纸吸附血清的性能,为其应用提供科学依据;③在前人的工作基础上,尝试建立了猪囊虫病抗体的双夹心酶标试验和旋毛虫病的炭凝试验,检验结果表明:两法的特异性、敏感性均达到或超过现行的检测法,而其操作简便、快速、成本低廉等优点却为其它方法所不及.     

基于小鼠肝炎病毒研究遗传工程小鼠隔离检疫设计

目的以小鼠肝炎病毒(MHV)为例,研究两种常用小鼠感染MHV后粪便中病毒核酸检测量与血清特异性抗体的变化,探讨实验动物病原微生物感染的检测设计。方法用MHV病毒核酸检测阳性的脏垫料持续饲养C57BL/6和BALB/c小鼠(n=20) 28 d,进行脏垫料接触感染。之后所有小鼠使用无菌垫料进行单笼饲养,每周收集新鲜粪便和血清样本,经Taqman荧光定量PCR(qPCR)和ELISA法检测后进行统计分析。结果对于BALB/c小鼠,采用qPCR法检测时,在实验第21天即有阳性检出(阳性率20%),第28天阳性检出率达到最高,为80%,第42天阳性检出率为50%,至第56天无阳性检出。血清ELISA检测发现,实验第42天才有MHV特异性抗体检出(阳性率为50%)。对于C57BL/6小鼠,采用qPCR法检测时,在第28天和第42天分别从20%小鼠粪便中检出MHV。而采用ELISA法在整个实验期均未检出特异性阳性抗体。结论在隔离检疫和常规病原检测中,建议选用BALB/c小鼠作为哨兵鼠,替代C57BL/6小鼠。由于qPCR法具有早检出和更高检出率的优点,建议在隔离检疫早期采用基于分子生物学的粪样核酸检测法替代ELISA法。     

延安市孕产妇弓形虫感染的血清学分析

目的 :为了解延安市不良孕产史妇女及妇科病患者与正常妊娠结局者及健康妇女的 Toxo感染情况 .方法 :用 ELISA对 96 4份血清进行了 Toxo特异性 Ig M、Ig G抗体的检测 .结果 :( 1 )延安市正常妊娠结局产妇和健康妇女 Toxo总阳性率为1 1 .1 9% . ( 2 )各不良妊娠结局组的 Toxo总感染率分别为 1 8.75 %、41 .1 1 %和30 .0 0 % ,均明显高于正常结局组 1 0 .82 % ,其中死胎、习惯性流产及难免流产组有显著差异 ( P<0 .0 1 ) . ( 3)妇科病患者中 ,不孕症和盆腔炎组 Toxo总感染率分别为2 8.33%和 2 3.2 6 % ,均明显高于健康妇女组 1 2 .0 5 % ( P<0 .0 1 ,P<0 .0 5 ) .结果 :上述结果与国内多数学者报道相一致 ,从而进一步证实 ,Toxo感染可导致不良的妊娠结局 ,同时更加说明 Toxo感染可能是妇科炎症性疾病及不孕症的致病原因之一     

痤疮丙酸杆菌对小鼠抗胸膜肺炎放线杆菌血清7型9型的免疫保护

为明确痤疮丙酸杆菌(PA)对具有抗胸膜肺炎放线杆菌(APP)血清7型和血清9型的异源免疫保护作用,对小鼠免疫PA分离株S14后,分别用APP血清7型(CCVC-265)和血清9型(CCVC-267)攻毒。结果表明,免疫保护率达60%和70%;而用猪抗PA血清免疫小鼠后以APP血清7型和血清9型攻毒,免疫保护率达100%。血清特异性抗体效价检测显示,PA免疫小鼠后,可诱导小鼠产生特异性的抗APP血清7型和9型的抗体,ELISA方法检测特异性抗体平均效价为1 800和2 800。PA对APP血清7型和9型的感染具有良好的保护作用。     

幽门螺杆菌感染与胃癌的关系

目的 :探讨幽门螺杆菌 (简称 Hp)感染与胃癌的关系。方法 :43例胃癌患者的新鲜癌手术标本及血清标本、36例十二提肠溃疡患者 (对照组 )的胃窦粘膜组织及血清标本入本组研究。分别采用 PCR及血清学试验检测其 Hp感染状况 ,两项检测均为阳性者即确立为 Hp感染。结果 :(1) 4 3例胃癌中 ,Hp阳性 30例 ,阳性率 6 9.77% ;36例十二指肠溃疡中 ,Hp阳性 30例 ,阳性率 83.33% ,两组阳性率相比差异无显著性。Hp阳性患者中 ,胃癌及对照组 cag A基因阳性分别为 2 4例、2 5例 ,阳性率分别为 80 .0 0 %、83.33% ,两组阳性率相比差异无显著性。(2 ) 4 3例胃癌中 ,高中分化腺癌组 Hp及 cag A检出率分别为 6 2 .5 0 %及 70 .0 0 % ,低未分化癌组 Hp及 cag A检出率分别为 74.0 7%及 85 .0 0 % ,但两组 Hp及 cag A检出率统计学上均无显著性差异。结论 :(1) Hp感染及 cag A+ 菌株感染不是胃癌发生的唯一或必须因素。 (2 )胃癌的分化程度与 Hp及cag A+菌株感染无明显相关性。     

建立Raji细胞免疫酶抑制法对血清抗HLA—DR抗体的检测

由于Raji细胞表面具有表达HLA-DR抗原特点,利用被测血清中抗HLA-DR抗体与抗人HLA-DR单克隆抗体竞争和Raji细胞表面HLA-DR抗原结合的特征,建立了Raji细胞免疫酶抑制法检测血清中抗HLA-DR抗体的方法。进行了方法学特异性,重复性和实验条件确定研究,并用此方法检测了72例系统性红斑狼疮患者和113例健康者血清。结果显示:该方法特异性强(中性粒细胞无显色反应);重复性好(抗体阳性血清变异率C.V为4.66％,抗体阴性血清C.V为0％);抗体滴度范围1∶5-1∶40。系统性红斑狼疮患者中抗HLA-DR抗体阳性率为30％;而健康阳性率为1.8％。作者认为:用Raji细胞免疫酶抑制法检测血清中抗HLA-DR抗体是一种特异性强,重复性好,操作简便和假阳性率低的方法,这种方法值得推广应用。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that