茯苓水提液对小鼠学习记忆的影响

目的研究中药茯苓水提液对小鼠学习记忆的影响.方法通过跳台法观察茯苓水提液对东莨菪碱所致记忆获得障碍模型小鼠和30%乙醇所致记忆再现障碍模型小鼠的影响.结果 1)茯苓水提液能减少东莨菪碱所致记忆获得障碍模型小鼠5 min内学习及记忆实验的错误次数,延长潜伏期,P<0.05,P<0.01,差异有统计学意义.2)茯苓水提液能减少30%乙醇所致记忆再现障碍模型小鼠测试实验中5 min内错误次数,延长潜伏期,P<0.05,P<0.01,差异有统计学意义.结论茯苓水提液能改善化学药物所致学习记忆障碍模型小鼠的学习记忆能力.     

中药复方SMⅠ对小鼠学习记忆功能障碍的影响

目的:探讨中药复方SMⅠ对小鼠记忆功能障碍的影响及其可能的机制。方法:用东莨菪碱、亚硝酸钠及乙醇分别建立记忆获得障碍、记忆巩固障碍和记忆再现障碍模型,用跳台法观察SMⅠ对记忆障碍动物学习记忆能力的影响。同时测定东莨菪碱记忆获得障碍小鼠脑组织中乙酰胆碱酯酶的活性。结果:SMⅠ可以减少东莨菪碱记忆获得障碍小鼠跳台累计触电时间(P<0 05),延长亚硝酸钠记忆障碍小鼠记忆测试中潜伏期的时程(P<0 05),减少其错误次数(P<0 05),也可以减少乙醇记忆再现障碍小鼠记忆测试的错误次数(P<0 05)。SMⅠ可以降低东莨菪碱记忆获得障碍小鼠脑乙酰胆碱酯酶活性(P<0 05)。结论:中药复方SMⅠ对记忆获得、记忆巩固及记忆再现障碍有明确的改善作用,其机制可能与影响中枢胆碱能系统有关。     

川芎嗪促进大鼠学习记忆作用的研究

采用川芎嗪对东莨菪碱所致大鼠学习记忆障碍的改善作用进行了研究,并进一步探讨其可能的作用机制.实验结果表明:东莨菪碱是中枢性抗胆碱药,能使训练后大鼠的获得性学习记忆成绩下降;毒扁豆碱是胆碱酯酶抑制剂,能促进中枢乙酰胆碱含量,拮抗东莨菪碱所致健忘;川芎嗪高剂量(20mg kg)能提高致健忘大鼠学习记忆成绩的正确率,统计处理结果有显著性意义(P<0 05).川芎嗪改善由东莨菪碱所致大鼠的记忆障碍,其机制可能是激活胆碱能神经系统的活性,提高脑内乙酰胆碱的含量.     

荧光光谱法研究钙调神经磷酸酶与其激活剂的相互作用

应用荧光光谱法研究了钙调神经磷酸酶 (CN)激活剂JJYD对CN的激活作用 .实验表明 ,JJYD确实对CN有一定的激活效应 ,其最佳激活质量浓度为 0 .2g·L- 1,激活率为 (14 9.9±0 772 ) % ;JJYD对CN的内源荧光有较强的猝灭作用 ,形成的复合物所产生的静态猝灭是引起CN荧光猝灭的主要原因 ,进一步依据荧光猝灭结果确定了JJYD CN复合物的结合常数K及结合位点数n ,证明二者有较强的结合力 .     

火麻仁提取液对D半乳糖致衰模型小鼠学习记忆及代谢产物的影响

以D 半乳糖致衰小鼠为研究对象 ,灌服火麻仁提取液 6 0d ,测定对小鼠学习记忆能力、免疫器官质量和脂质过氧化的影响 .结果发现 ,火麻仁提取液 (2 0 g·kg- 1)对小鼠学习记忆有一定的改善作用 ,能显著增加致衰小鼠的脾指数 (P <0 .0 0 1) ,并且显著降低脑组织中丙二醛的质量摩尔浓度 (P <0 .0 5 ) .     

三七皂甙Rg1对小鼠记忆获得和记忆保持障碍的影响

研究三七皂甙Rg1对小鼠记忆获得和记忆保持障碍的影响。分别以腹腔注射东莨菪碱(3mg/kg)、亚硝酸钠(120mg/kg)造成小鼠记忆获得和记忆保持障碍,采用避暗法测定小鼠进入暗室的潜伏期,检测小鼠记忆能力。结果显示,模型组小鼠出现显著的记忆获得障碍和记忆保持障碍,与对照组比较有显著性差异(P<0.01,P<0.05)。与模型组比较,三七皂甙Rg1在30、60mg/kg小鼠进入暗室的潜伏期显著增加(P<0.01,P<0.05)。结果表明,三七皂甙能明显改善由东莨菪碱所致小鼠记忆获得和亚硝酸钠造成的记忆保持障碍。     

远志茯苓醇提物改善学习记忆障碍的实验研究

目的 通过观察中药远志茯苓醇提物对学习记忆障碍动物模型的影响,研究其改善学习记忆障碍的药理作用,并探讨其作用机制,为中药远志茯苓能够预防和治疗老年性痴呆即阿尔茨海默病提供可靠的依据.方法 通过避暗法观察远志茯苓醇提物对东莨菪碱所致记忆获得性障碍模型小鼠的影响;通过跳台法观察远志茯苓醇提物对30%乙醇所致记忆再现障碍模型...     

远志皂苷和茯苓多糖对学习记忆的改善作用及其机制研究

目的观察PSP(远志皂苷和茯苓多糖Polygalaceae saponins and Pachymaran)对多种化学药物所致学习记忆障碍模型小鼠学习记忆能力的改善作用,探讨其可能的作用机制.方法本研究通过跳台实验和避暗实验观察PSP高、中、低剂量组对记忆获得、巩固和再现模型小鼠学习记忆能力的影响;测定记忆获得障碍模型小鼠脑组织乙酰胆碱酯酶活性(ACHE);测定记忆巩固障碍模型小鼠脑组织超氧化物歧化酶(SOD)活性和丙二醛(MDA)活性.结果 PSP能使记忆获得障碍模型小鼠5 min内学习及记忆的错误次数减少并延长潜伏期;PSP能使记忆获得、巩固障碍模型小鼠5 min内错误次数减少并延长潜伏期;PSP能使记忆再现障碍模型小鼠5 min内错误次数减少并延长潜伏期;PSP能有效降低记忆获得障碍模型小鼠脑组织中乙酰胆碱酯酶(ACHE)活性;PSP能有效提高记忆巩固障碍模型小鼠脑组织中超氧化物歧化酶(SOD)活性并降低丙二醛(MDA)活性.结论 PSP能改善模型小鼠学习记忆能力的作用机制可能是通过抑制脑内乙酰胆碱酯酶合成、减少乙酰胆碱水解、提高脑组织内ACHE活性而发挥改善学习记忆的作用;PSP能有效提高SOD活性并减低MDA活性,从而减少氧自由基对小鼠损伤而发挥改善学习记忆的作用.     

戒毒一号对甲基苯丙胺诱导的小鼠学习记忆损伤的改善作用

目的研究戒毒一号对甲基苯丙胺诱导小鼠学习记忆损伤的改善作用。方法将实验动物随机分成4组,对照组给予生理盐水,模型组给予甲基苯丙胺(10 mg/kg),给药组分别给予戒毒一号(14. 12、56. 48 g/kg)。通过Morris水迷宫检测小鼠的学习和记忆能力,观察戒毒一号对甲基苯丙胺诱导小鼠学习记忆损伤是否具有改善作用。结果与对照组相比,模型组小鼠训练阶段逃避潜伏期显著延长(P <0. 05),表明模型组小鼠的学习能力下降;模型组小鼠在测试阶段穿梭平台的次数显著减少(P <0. 05),表明模型组小鼠记忆能力损伤。与模型组相比,低剂量组小鼠训练阶段逃避潜伏期显著缩短(P <0. 05),小鼠在测试阶段穿梭平台的次数显著增多(P <0. 05);与模型组相比,高剂量小鼠的逃避潜伏期有缩短的趋势,测试阶段穿梭平台的次数和时间有增加的趋势,但差异无统计学意义。结论戒毒一号具有改善甲基苯丙胺诱导小鼠学习记忆损伤的作用。     

川芎嗪改善东莨菪碱致大鼠学习记忆障碍研究

实验采用三门迷路法研究川芎嗪对东莨菪碱所致大鼠学习记忆障碍的改善作用,并进一步探讨其可能的作用机制.实验结果表明：东莨菪碱能使训练后大鼠的获得性学习记忆能力下降,川芎嗪能改善由东莨菪碱所致大鼠的记忆障碍,统计结果有显著性差异.其作用机制可能是激活胆碱能神经系统的活性,提高脑内乙酰胆碱的含量.     

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.     

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.     

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.     

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.     

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.