整合素α2β1对肝癌细胞粘附与趋化行为的影响

采用微吸管技术,研究整合素α2β1对肝细胞癌（HCC）细胞SMMC-7721与Ⅳ型胶原衬表面粘附力特性和该细胞对Ⅳ型胶原趋化行为的影响．观察Anti-α2、Anti-β1对SMMC-7721细胞与Ⅳ型胶原裱衬表面的粘附力的影响;采用双微吸管实验法,观察SMMC-7721细胞伪足形成过程以及Anti-α2、Anti-β1对SMMC-7721细胞伪足形成的影响．利用流式细胞仪对SMMC-7721细胞表面整合素α2、β1亚单位的表达进行分析．结果表明,SMMC-7721细胞与5μg／mL Ⅳ型胶原裱衬表面之间的粘附力为952±134（×10^-10 N,n=60）,加入5μg／mL Anti-α2粘附力减小到605±128（×10^-10 N,n=60）;加入10μg／mL Anti-α2时粘附力减小到579±57（×10^-10 N,n=50）．加入5μg／mL Anti-β1粘附力减小到449±119（×10^-10 N,n=60）;加入10μg／mL Anti-β1时粘附力减小到220±78（×10^-10 N,n=55）．双微吸管趋化实验表明：两侧微吸管加入相同浓度Ⅳ型胶原,细胞向两侧微吸管均有伪足形成;在此基础上,微吸管分别加入Anti-α2、Anti-β1的一侧,SMMC-7721细胞伪足生长曲线呈现明显的抑制,而未加入抗体的微吸管一侧与加入的对侧相比,该侧细胞的伪足明显增加．流式细胞仪分析表明,所研究细胞整合素α2、β1亚单位表达率达分别为23．17％和95．78％．上述结果表明,整合素α2β1是联系SMMC-7721肝癌细胞与Ⅳ型胶原裱衬表面粘附以及SMMC-7721细胞对Ⅳ型胶原趋化性伪足形成的重要受体基础．     

细胞骨架对肝癌细胞粘附性的影响

利用微管吸吮技术,定量研究了肝癌细胞在ＩＶ型胶原／层粘素复合裱衬表面上的粘附特性,在此基础上,利用两种细胞骨架干扰剂进上步探讨了细胞骨架系统对肿瘤细胞粘附力的影响。结果：以正常肝细胞对照,用细胞松弛素Ｄ（０．２５～５ｕｇ／ｍＬ）处理后,两种细胞粘附力大大降低约７０％～９０～,而癌细胞降低幅度更大,用秋水仙素（１～６０ｕｇ／ｍＬ）处理后,癌细胞的粘附力降低或趋于降低,而正常肝细胞则升高１４０％～５０     

乙酰胆碱对大鼠离体输精管平滑肌细胞膜电位的作用

采用细胞内微电极技术对大鼠离体输精管平滑肌细胞进行记录,观察其静息电位、膜阻抗等被动膜电性质及ACh对平滑肌细胞膜电位的作用,在此基础上运用微电泳技术对所记录细胞进行标记,从而分析不同走行方向的平滑肌细胞的电生理学特性。实验测得输精管平滑肌细胞静息电位为-48.56±0.46mV(n=1141),膜输入阻抗为1638.70±205.20MΩ(n=45)。实验用ACh(0.3～100μmol L)灌流平滑肌细胞,可引起膜发生浓度依赖性超极化。10μmol LACh引起超极化幅值为13.67±0.98mV(n=116),膜电导平均增加2.31%(n=10)。标本经1μmol L硫酸阿托品(n=10)和100nmol L2' deoxyadenosine5' monophosphate(n=11)预处理后,ACh引起的超极化幅值明显减小。经荧光染料(0.1%propidiumiodide)标记鉴别后,统计分析外纵走行细胞的静息电位为-53.56±3.88mV(n=37),膜输入阻抗为2245.60±372.50MΩ(n=13);内环走行细胞的静息电位为-51.62±4.27mV(n=17),膜输入阻抗为2101.50±513.50MΩ(n=10);并且2种走形方向的平滑肌细胞对ACh的反应形式亦无显著性差异。实验表明:输精管平滑肌细胞的电生理特性以及对ACh的反应与其走形方向无关。     

石龙子rADVR突触结构的定量分析

用实物及计算机投影系统对石龙子前背侧室嵴嘴外侧区突触的电镜图像进行放大处理和统计分析,测量结果:突触前膜平均厚度为70.3×10-10m,后膜平均厚度为117.7×10-10m,突触间隙平均宽度为147×10-10m,突触界面曲率为:平均值±标准差=(1.123±0.389)×10-10m,突触活性带长度为:平均值±标准差=(3 514.93±982.75)×10-10m,空心小泡直径为:平均值±标准差=(477.3±38.45)×10-10m(n=58),实心小泡直径为:平均值±标准差=(892±55.83)×10-10m(n=28).     

某些自由基清除剂对抗哇巴因致豚鼠心律失常的研究(简报)

用哇巴因致心律失常为模型,观察自由基清除剂亚硒酸钠(Sodium Selenate)和超氧化物歧化酶(Snperoxide dismutase,简称SOD)对哇巴因致动物中毒的影响。豚鼠300-400g体重,随机分为4组:(1)对照组,n=10,静脉注入等容积生理盐水,实验结果表明哇巴因致室早、室速、室颤和死亡的剂量分别为158.15±25.46、179.76±34.29、227.68±39.35和309.87±38.23ug/kg((?)±SD)。(2)亚硒酸钠组,n=10,实验结果表明哇巴因致室早、室速、室颤和死亡的剂量分别为192.60±26.23~*、224.84±29.42~(***)、274.88±20.14~(***)和345.69±23.51~(**)ug/kg((?)±SD)。(3) SOD组,n=8,实验结果表明哇巴     

SLE患者淋巴细胞凋亡及血清新蝶呤、γ-干扰素水平研究

探讨SLE患者体内淋巴细胞凋亡率、巨噬细胞功能相关的细胞因子(新蝶呤、γ-干扰素)水平及两者间相互关系,并同时与抗ds-DNA抗体滴度、疾病活动性评分(SLAM评分)进行相关性分析.应用Annexin V凋亡检测试剂盒及流式细胞仪检测淋巴细胞凋亡率;采用ELISA法检测血清γ-干扰素、新蝶呤水平.结果发现:(1)SLE活动期患者外周血淋巴细胞凋亡率((13.07±7.39),n=30)明显高于非活动期患者((4.08±3.55),n=8,P<0.001)及正常人((5.13±3.37),n=11,P<0.001).(2)抗ds-DNA抗体阳性组患者淋巴细胞凋亡率((12.98±9.25),n=20)与阴性组((9.35±4.76),n=18)相比无差异(P=0.14).淋巴细胞凋亡率与抗ds-DNA抗体滴度无相关性(r=0.112,P=0.77).(3)SLE患者血清新蝶呤水平((1.39±1.10)μg/L,n=20)极显著高于正常人((0.36±0.19)μg/L,n=20,P<0.01).(4)SLE活动期患者血清γ-干扰素水平((58.97±34.52)ng/L,n=15)显著高于正常人((28.06±2.35)ng/L,n=16,P<0.05).(5)SLE患者淋巴细胞凋亡率与血清新蝶呤水平呈正相关(r=0.446,P<0.05,n=22),与SLAM评分呈正相关(r=0.533,P<0.001,n=38),血清新蝶呤水平与SLAM评分亦呈正相关(r=0.485,P<0.05,n=22).未发现SLE患者淋巴细胞凋亡与抗ds-DNA抗体产生相关,未发现明显升高的细胞凋亡率与血清新蝶呤     

多项式xn-bx-a的二次不可约因式

设n>4,fb(x)=xn-bx-a∈Z[x],其中a,b≠0,n∈N,a,b∈Z.讨论b=±1时fb(x)的二次不可约因式.证明x6-x-a在Z[x]中没有二次不可约因式;若f-1(x)在Z[x]中有二次不可约因式,除了n≡2(mod 3),a=-1,g(x)=x2+x+1情况外,必有n=5,a=±6或n=13,a=±90,且g(x)=x2±x+2.     

离子增强-反相高效液相色谱法快速测定落羽杉中莽草酸

建立了离子增强反相高效液相色谱法(RP-HPLC)快速测定落羽杉中痕量莽草酸的方法．用色谱柱Hyper- silODS 25μm(4．6 mm×150 mm),以HClO4(pH=2．5)溶液为流动相,柱温30℃时于214 nm波长处以外标法测定．结果表明莽草酸在2．22×10-8-3．59×10-4g／mL范围内,浓度与峰面积有良好的线性关系(r=0．999 8)．莽草酸的回收率为98．52％-98．91％,相对标准偏差为1．45％-1．70％(n=5)．检测限为2．02×10-10g／mL(S／N= 2)．实验表明该法简便、快速,应用于实际落羽杉样品中莽草酸的测定,取得了很好的结果．     

反相高效液相色谱法测定PELA微粒中胰岛素含量

为测定PELA微粒中胰岛素含量,建立反相高效液相色谱方法. 以Zorbax300SB-C18高效液相色谱柱分离;检测波长为220 nm;流动相组成为:V(H2O(含φ(TFA)＝0.15%))∶V(CH3CN)＝66∶34;保留时间为4.3 min. 结果在ρ(胰岛素)为10～200 μg/mL范围内,峰面积(A)与胰岛素质量浓度(ρ)成线性变化,其线性方程为:ρ=7.82×10-2A +9.88×10-2,相关系数r=0.999 95. 日内差和日间差分别为0.6%和0.7%. 当ρ(胰岛素)为60, 80和100 μg/mL时的回收率分别为(98.1±0.5)%, (99.6±1.5)%和(99.4±1.0)%(n＝6). 测得胰岛素在PELA微粒中的包封率为(56.3±3.3)%(n＝6).     

东北虎幼体血象测定与分析

对13只东北虎幼体的血细胞数、血红蛋白含量、白细胞分类计数和血细胞直径进行了测定,用SPSS软件对实验数据进行统计处理.结果显示:东北虎幼体红细胞数(6.82±0.60)×1012/L,血小板数(415.38±71.51)×109/L,白细胞总数(16.95±2.74)×109/L,血红蛋白含量(118.92±17.24)g/L,嗜中性粒细胞(62.52±9.32)%,嗜酸性细胞(2.88±2.32)%,嗜碱性细胞(0.44±0.58)%,淋巴细胞(28.96±7.50)%,单核细胞(5.32±3.73)%;血细胞平均直径分别为:红细胞6.7μm、嗜中性粒细胞11.0μm、嗜酸性粒细胞11.7μm、嗜碱性粒细胞12.5μm、淋巴细胞8.6μm、单核细胞12.9μm.结论:所测的血液指标在东北虎幼体雌雄性别间均无显著差异(P>0.05).     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

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

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.