丹参酮Ⅱ A通过调控PKC/CyclinD_1通路抗大鼠心肌成纤维细胞增殖作用研究

目的观察丹参酮ⅡA(TaishinoneⅡA,TSN)和蛋白激酶C(PKC)抑制剂白屈菜红碱(Chelerythrine,Chele)抗血管紧张素Ⅱ(AngiotensinⅡ,AngⅡ)诱发的心成纤维细胞(Cardiac fibroblast,CFb)增殖、细胞周期、Ⅰ型胶原纤维(CollagenⅠ)、PKC和细胞周期蛋白Cyclin D1表达的影响,阐明TSN抗CFb增殖的分子机制.方法培养的新生Wistar大鼠CFb分为对照组、AngⅡ组、Chele+AngⅡ组、Chele+AngⅡ+TSN组和AngⅡ+TSN组,胰酶消化、差速贴壁培养CFb,噻唑蓝(MTT)比色法检测细胞增殖;免疫细胞化学染色(IC)法测定Collagen I含量;流式细胞仪(FCM)检测细胞周期;免疫印迹法(WB)检测PKC和细胞周期蛋白Cyclin D1表达.结果与AngⅡ组比较,Chele和TSN组及Chele+AngⅡ+TSN组能显著降低CFb增殖率(P0.05或P0.001),降低CollagenⅠ含量(P0.05或P0.01),提高CFb G0/G1期细胞百分比,降低S期细胞百分比(P0.05或P0.01),抑制PKC和Cyclin D1蛋白表达(P0.05或P0.01).结论 TSN和Chele能显著抑制由AngⅡ诱导的CFb增殖和胶原蛋白分泌,其机制可能是通过抑制PKC-Cyclin D1传导通路实现的.     

肺腺癌A549细胞膜上磷脂翻转酶的存在与顺铂耐药性

为证实肺腺癌细胞膜上是否存在磷脂翻转酶,将含有NBD－PE荧光探剂的脂质体与A549和A549／DDP细胞融合,根据外膜NBD－PE的荧光强度变化来检测细胞膜上磷脂翻转酶的存在及其活性。当含有NBD－PE的A549和A549／DDP细胞在保温0,30,60和90 min时,测定外膜NBD－PE的结果表明,A549细胞的NBD－PE荧光强度在上述不同时间保温后分别为0％,1．4％,2．9％和7．8％;而A549／DDP细胞则相应为0％,10．5％,15．5％和18．3％,证实A549肺腺癌细胞上存在磷脂翻转酶。而且,具有抗药性的A549／DDP细胞膜上的磷脂酶的活力明显高于药物敏感的A549细胞。用多药耐药逆剂Verapamil(20μmol/L）在37℃处理A549／DDP细胞60min后测定其结果又表明,NBD－PE在膜外侧的增加较对照降低了25．0％,而用治疗肺腺癌的特异性抗癌药cisplatin(25 μmol/L)处理时,NBD－PE在膜外侧的增加降低了31．6％,且随cisplatin的浓度增加进一步降低达79．4％。这与肺腺癌细胞的耐药性可能相关。     

丹参酮ⅡA对人成骨肉瘤MG-63细胞增殖的抑制作用

应用细胞培养、台盼蓝拒染计数、光学显微镜观察、流式细胞仪检测及免疫细胞化学等技术研究中药有效成分丹参酮ⅡA对人成骨肉瘤MG-63细胞增殖抑制作用．实验结果显示，丹参酮ⅡA处理MG-63细胞后，细胞增殖活动受到抑制，抑制率为52．10％，细胞倍增时间由对照组的48h延长至65h；细胞发生G0／G1期阻滞，G0／G1期细胞比例由对照组的47．5％上升到59，5％，S期细胞比例则由对照组的20．0％下降至9．0％；并出现细胞形态规则、大小趋于一致、细胞体积增大、核质比例减小等变化；MG-63细胞增殖分化调控相关的癌基因c-fos和c-myc表达活性降低．结果表明，丹参酮ⅡA对人成骨肉瘤MG-63细胞增殖有显著抑制作用，其作用可能与干预c-fos和c-myc等癌基因表达从而调控细胞周期有关．     

中华大蟾蜍尾部程序性死亡的形态学和相关酶的研究

为了研究两栖类变态过程中程序性死亡的分子机制,本文利用尾部离体培养、DNA含量分析、组织切片和形态学分析等方法,观察和分析了中华大蟾蜍变态过程中尾部程序性死亡的形态学变化;同时研究了磷脂酰胆碱特异性磷脂酶C的抑制剂对蝌蚪尾部程序性死亡的影响.发现这一特异性抑制剂明显阻止了中华大蟾蜍变态中尾部的萎缩,表明该酶在其尾部的程序性死亡中发挥重要作用.本文的这一发现为深入研究发育过程中程序性死亡的分子机制奠定了基础.     

褪黑素单克隆抗体的制备及鉴定

为了获得抗褪黑素(MT)高效价的单克隆抗体,用甲醛将MT连结到BSA上,然后用连结物背部皮下多点免疫Balb／c小鼠,用PEG诱导免疫鼠脾细胞与Sp2／0细胞融合,经ELISA法筛选阳性克隆株及测定效价,用抗体与同类物之间的交叉反应进行特异性鉴定．最后获得5株(4C9D7、3E12C7H11E7、3E12A9D7、6A6A3A2C3、1E1E2H2H6)能稳定分泌高效价抗MT的单克隆抗体(McAb)的杂交瘤细胞。     

重组诱导型一氧化氮合酶基因转染血管平滑肌细胞及对其增殖的影响

探讨重组诱导型一氧化氮合酶基因转染血管平滑肌细胞及产生的一氧化氮对血管平滑肌细胞增殖的影响。将诱导型一氧化氮合酶基因通过真核表达载体转入血管平滑肌细胞中 ,用Griess法测定转染细胞生成的一氧化氮的量。观察转染后平滑肌细胞生长状态情况 ,用流式细胞仪分析细胞周期的变化。结果正常细胞组NO的含量为78.4 4± 1 5 .38,而iNOS转染组NO含量为 2 36 .5 7± 31 .83,两组相比有非常显著差异 (P =0 .0 0 0 ,n =6 ) ,血管平滑肌细胞转染后生成一氧化氮。转染后的平滑肌细胞生长明显受到抑制 ,主要抑制平滑肌细胞周期G1 S期的过渡 ,使细胞停留在G1期。说明血管平滑肌细胞可以成功转染iNOS基因 ,生成的一氧化氮可明显抑制平滑肌细胞的增殖 ,为从血管非内皮成分进行iNOS基因转染提供了实验研究的依据     

亚历山大藻细胞周期中毒素含量及组成的变化

用细胞同步化培养的方法,研究了塔玛亚历山大藻A.tamarense CI01株不同细胞周期细胞中毒素含量与组成的变化.结果表明,A.tamarense CI01细胞分裂主要发生在早上6时至8时,细胞密度在6 h内增加近一倍.细胞内毒素合成主要在细胞周期的G1期,由光诱导合成,毒素含量(fmol/cell,Qt)在光周期前8 h内从17 fmol/cell增加到分裂前的24 fmol/cell,而在其它细胞周期细胞内毒素含量稳定,基本不合成毒素.比较分析单细胞C1,2毒素和GTX2,3毒素合成时间及速率,推测在A.tamarense CI01中细胞首先合成GTX2,3,在其它修饰酶的作用下再转化为C1,2.     

清热解毒药对血管平滑肌细胞增殖、细胞周期的影响

目的 :观察清热解毒药双花、公英、虎杖、连翘对血管平滑肌细胞生长、贴壁和增殖抑制作用 ,并从对细胞周期的影响角度分析它们的作用机制。方法 :采用细胞计数、MTT法和流式细胞技术。结果 :双花、公英、虎杖、连翘对h PDGF B/B刺激下的平滑肌细胞生长和贴壁均有抑制作用。对平滑肌细胞增殖抑制率分别达 9.2 6%～ 77.35% ,7.78%～ 62 .65% ,5.88%～ 47.81 % ,3.98%～ 33.35% ,其增殖抑制作用呈量效时效关系。通过对细胞周期分析知道 ,双花、公英、虎杖均可以减少 S期 ,增加 G0 /G1期细胞数目。结论 :清热解毒药双花、公英、虎杖、连翘对平滑肌细胞生长及增殖有抑制作用 ,其作用机制可能是通过抑制 DNA合成 ,减少进入 S期细胞数目 ,使细胞增殖停留在 G0 /G1期来实现的     

亚历山大藻细胞周期中毒素含量及组成的变化

用细胞同步化培养的方法,研究了塔玛亚历山大藻A.tamarenseCI01株不同细胞周期细胞中毒素含量与组成的变化.结果表明,A.tamarenseCI01细胞分裂主要发生在早上6时至8时,细胞密度在6 h内增加近一倍.细胞内毒素合成主要在细胞周期的G1期,由光诱导合成,毒素含量（fmol/cell,Qt）在光周期前8 h内从17 fmol/cell增加到分裂前的24 fmol/cell,而在其它细胞周期细胞内毒素含量稳定,基本不合成毒素.比较分析单细胞C1,2毒素和GTX2,3毒素合成时间及速率,推测在A.tamarenseCI01中细胞首先合成GTX2,3,在其它修饰酶的作用下再转化为C1,2.     

丹参酮ⅡA对人成骨肉瘤MG-63细胞增殖的抑制作用

应用细胞培养、台盼蓝拒染计数、光学显微镜观察、流式细胞仪检测及免疫细胞化学等技术研究中药有效成分丹参酮ⅡA对人成骨肉瘤MG-63细胞增殖抑制作用.实验结果显示,丹参酮ⅡA处理MG-63细胞后, 细胞增殖活动受到抑制,抑制率为52.10%,细胞倍增时间由对照组的48 h延长至65 h;细胞发生G0/G1期阻滞,G0/G1期细胞比例由对照组的47.5%上升到59.5%,S期细胞比例则由对照组的20.0%下降至9.0%;并出现细胞形态规则、大小趋于一致、细胞体积增大、核质比例减小等变化;MG-63细胞增殖分化调控相关的癌基因c-fos和c-myc表达活性降低.结果表明,丹参酮ⅡA对人成骨肉瘤MG-63细胞增殖有显著抑制作用,其作用可能与干预c-fos和c-myc等癌基因表达从而调控细胞周期有关.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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。     

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.     

A computer generator for randomly layered structures

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

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-