聚焦超声激活血卟啉对在体S180肿瘤细胞的抑制作用研究

目的 研究频率为2.2MHz的聚焦超声结合血卟啉对在体S180肿瘤组织的杀伤作用.方法 计算不同处理后对肿瘤组织的生长抑制作用,并通过透射电镜观察处理后不同时间段取材S180实体瘤超微结构的变化.结果 单纯血卟啉对在体S180肿瘤细胞几乎没有生长抑制作用;单纯超声对S180肿瘤组织有一定的生长抑制作用,且随着超声强度的增加,抑制效应逐渐显著,而超声结合血卟啉所产生的协同效应对S180肿瘤细胞的生长抑制作用明显高于单纯超声组,电镜下观察到超声激活血卟啉可以破坏肿瘤细胞的超微结构,尤其是对肿瘤细胞膜和膜性细胞器的通透性和结构的损伤,并且随着取材时间的延长,损伤效应进一步加强.结论 超声结合血卟啉能有效地抑制S180肿瘤的生长作用.     

夹竹桃多糖抗小鼠S180肉瘤的实验研究

用水提醇沉法提取夹竹桃叶多糖(NP),观察其对小鼠S180皮下移植瘤和S180腹水瘤的生长抑制作用,采用免疫组化法检测了移植瘤组织中PCNA、bcl-2、bax蛋白表达的变化,采用药物相互作用指数研究了NP与环磷酰胺联用对S180移植瘤的协同抑制作用.苯酚-硫酸法测定结果表明,提取物中的多糖质量分数为81.14%.NP对小鼠S180移植瘤有显著的抑制作用并且能延长腹水瘤小鼠的寿命,50,100,150 mg/kg剂量组的抑瘤率分别为40.00%,50.83%,44.17%,生命延长率分别为42.86%,64.29%,43.88%.NP作用后瘤组织中PCNA、bcl-2细胞的阳性率显著降低,bax细胞的阳性率显著升高,NP与环磷酰胺有一定的协同效应.     

穿心莲内酯对S180小鼠体内抗肿瘤作用的研究

观察穿心莲内酯对小鼠移植性肿瘤S180生长的抑制作用,并探讨其可能的机制.采用MTT法检测穿心莲内酯对体外培养的S180细胞增殖的抑制作用;建立小鼠移植瘤模型,采用荷瘤小鼠抑瘤率检测穿心莲内酯对小鼠肉瘤S180的体内抗肿瘤作用.以对荷瘤小鼠免疫器官质量,巨噬细胞对中性红的吞噬率,巨噬细胞产生TNF-α的影响评价穿心莲内酯对小鼠免疫功能的作用.结果穿心莲内酯能够剂量依赖型的抑制体外培养的S180细胞的增殖;25、50 mg/kg的穿心莲内酯对移植性动物肿瘤S180的抑瘤率分别为45.27%和56.87%,对荷瘤小鼠脾脏和胸腺质量无明显的影响.经穿心莲内酯刺激后,小鼠巨噬细胞对中性红的吞噬功能明显地增强,并能显著刺激巨噬细胞分泌TNF-α.说明穿心莲内酯具有明显的体内抗肿瘤作用,其抗肿瘤活性是通过抑制肿瘤细胞的生长,激活小鼠巨噬细胞两方面共同产生的.     

半枝莲多糖对小鼠S180肉瘤抑制作用的研究

探讨半枝莲多糖对体内S180肉瘤肿瘤抑制作用及相关机制.采用动物移植性肿瘤实验观察半枝莲多糖对小鼠体内肿瘤细胞生长的影响,ELISA法检测对荷瘤小鼠外周血血清中白细胞介素-2和干扰素-α质量浓度的影响.结果显示,半枝莲多糖对S180肉瘤生长的抑制率以中剂量为佳;各剂量组均对脾脏指数有显著性差异,能够提高S180荷瘤小鼠外周血血清中白细胞介素-2及干扰素-α的质量浓度,但中剂量最为显著,表明半枝莲多糖在小鼠体内具有抑制S180肉瘤的作用.     

垂盆草不同提取物对小鼠移植性肿瘤抑制作用的初步研究

初步观察垂盆草不同提取物的抗肿瘤药效。采用小鼠S180肉瘤模型及小鼠S180腹水癌模型,分别用垂盆草水提物、垂盆草醇提物灌胃给药,连续8天,测定腹水瘤小鼠的生命延长率及实体瘤小鼠的瘤重。实验结果显示,垂盆草水提物、垂盆草醇提物对小鼠S180肉瘤的生长有明显抑制作用,肿瘤重量明显减轻。对小鼠S180腹水瘤小鼠生存天数亦有明显延长作用。说明垂盆草对小鼠移植性肿瘤具有抑制作用,为进行临床应用和深入的基础研究提供了依据。     

甘肃猫儿眼提取物对S180瘤株毒性作用

给予S180荷瘤小鼠不同剂量的甘肃猫儿眼提取物后，对瘤体、胸腺和脾脏重量以及对荷瘤小鼠免疫功能的影响进行测定分析。结果为，给予甘肃猫儿眼提取物20．0g／kg体质量／d，po，10d后测定，甘肃猫儿眼提取物对S180生长抑制率为42％；对小鼠碳粒廓清指数、免疫器官的重量、血清溶血素值增高等均有促进作用，组织病理学观察，给药组S180瘤体均见坏死灶，坏死面积与给药剂量呈正相关。提示，甘肃猫儿眼提取物对8180细胞增殖具有明显的抑制作用，其作用机制与提高荷瘤小鼠免疫功能有关．     

拟黑多刺蚁体外抑瘤作用研究

目的　通过拟黑多刺蚁对体外S180 ,H2 2 ,YAC 1肿瘤细胞DNA合成影响及细胞毒性作用 ,研究该蚁抑瘤效应及机制 .方法　采用3H TdR掺入法和12 5I UdR释放法 .结果　拟黑多刺蚁对S180 ,H2 2 ,YAC 1肿瘤细胞DNA合成均有明显抑制作用 (P <0 .0 5 ) ,其抑制作用随剂量增加而增强 .以对S180 肿瘤细胞抑制作用最显著 .同时证实 ,该蚁对YAC 1,S180 肿瘤细胞均有毒性作用 .结论　拟黑多刺蚁对肿瘤细胞具有直接杀伤和抑制生长的作用 .     

仙芦抗癌胶囊抗肿瘤作用及其作用机制研究

通过观察仙芦抗癌胶囊对S180A和H22荷瘤小鼠瘤重和生存时间的影响,观察其体内抗肿瘤作用.采用荧光探针DPH法,观察仙芦抗癌胶囊对S180A和H22荷瘤小鼠红细胞膜流动性的影响.实验结果发现仙芦抗癌胶囊(1g/kg,0 5g/kg,0 25g/kg)对S180A小鼠的瘤体生长有显著的抑制作用.仙芦抗癌胶囊(1g/kg,0 5g/kg)对H22小鼠的生存时间有显著的延长作用.仙芦抗癌胶囊高、中、低剂量(1g/kg,0 5g/kg,0 25g/kg)均能够升高S180小鼠红细胞膜流动性.仙芦抗癌胶囊高、中剂量(1g/kg,0 5g/kg)均能够降低H22小鼠红细胞膜流动性,而低剂量组无明显作用.因此仙芦抗癌胶囊对S180A和H22都有显著的抑制作用,抗肿瘤作用机制与其恢复荷瘤小鼠红细胞膜流动性有关.     

化胃舒颗粒体内抗肿瘤作用的实验研究

摘要: 目的探讨化胃舒颗粒对小鼠移植性肿瘤的抑制作用。方法以S180 肉瘤和H22 肝癌作为实验瘤株,观察化胃 舒颗粒对S180 小鼠肉瘤的抑瘤率及对H22 肿瘤小鼠生存期的影响。采用小鼠移植性肿瘤S180 实体瘤模型,观察化胃舒 颗粒与环磷酰胺( CTX) 联用对S180 实体瘤小鼠的白细胞数及抑瘤率的影响。结果化胃舒颗粒能阻止S180 肿瘤生长, 小鼠肿瘤抑制率在30%以上; 化胃舒颗粒能明显延长H22 肿瘤小鼠的生存时间; 化胃舒颗粒能抑制由环磷酰胺( CTX) 引 起的S180 实体瘤小鼠血液中白细胞总数的减少,从而增强环磷酰胺( CTX) 的抑瘤作用。结论化胃舒颗粒对S180 肉瘤 和H22 肝癌荷瘤小鼠有明显的抗肿瘤作用,与环磷酰胺( CTX) 合用有显著的减毒增效作用。     

马齿苋多糖的抗肿瘤活性

研究了马齿苋多糖的抗肿瘤活性。结果表明马齿苋多糖可使小鼠T淋巴细胞数量增加，体外对肝癌细胞SMMC7721的增殖具有一定的抑制作用，体内可使小鼠S180腹水瘤分裂指数显著下降，并能明显抑制小鼠S180移植性实体瘤生长。     

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.