共查询到20条相似文献，搜索用时 62 毫秒
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目的:观察川芎嗪对家兔心肌缺血再灌注损伤的保护作用.方法:采用在体家兔冠状动脉阻断的缺血/复灌损伤模型,测定心肌梗死面积、血浆中乳酸脱氢酶(LDH)、肌酸激酶(CK)及天门冬酸氨基转移酶(AST)活性及各项心室力学指标.结果:与单纯缺血/复灌组相比,川芎嗪明显降低心脏缺血/复灌后的梗死面积和血浆中LDH、CK及AST含量,促进左室收缩压(LVSP)、最大左室收缩速率( dP/dtmax)和最大左室舒张速率(-dP/dtmax)的恢复.结论:川芎嗪预处理对家兔心肌缺血再灌注损伤有良好的保护作用. 相似文献
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目的:观察黄芪预处理对家兔心肌缺血再灌注损伤的保护作用。方法:采用在体家兔冠状动脉阻断的缺血/复灌损伤模型,测定心肌梗死面积、血浆中乳酸脱氢酶(LDH)和肌酸激酶(CK)活性及各项心室力学指标。结果:与单纯缺血/复灌组相比,黄芪预处理明显降低心脏缺血/复灌后的梗死面积和血浆中LDH、CK含量,促进左室收缩压(LVSP)、最大左室收缩速率( dP/dtmax)和最大左室舒张速率(-dP/dtmax)的恢复。结论:黄芪预处理对麻醉家兔心肌缺血再灌注所致心肌损伤具有保护作用。 相似文献
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目的：研究心肌缺血预处理（IP）延迟性保护作用终末阶段（IP后48h至72h）的机制,以及神经型一氧化氮合酶（nNOS）、诱生型一氧化氮合酶（iNOS）是否中介了此过程。方法：采用在体家兔冠状动脉阻断的缺血/复灌损伤模型,测定心肌梗死面积、冠脉流出液中乳酸脱氢酶（LDH）和肌酸激酶（CK）含量及各项心室力学指标。结果：与单纯缺血/复灌组相比,IP后72h,明显降低心脏缺血/复灌后的梗死面积和血浆中乳酸脱氢酶（LDH）、肌酸激酶（CK）的含量,促进左室收缩压（LVSP）、最大左室收缩速率（＋dP/dtmax）和最大左室舒张速率（-dP/dtmax）的恢复。使用iNOS的特异性抑制剂S-methylisothiourea sulfate（SMT）不能阻断IP后72h心肌保护作用。而nNOS的特异性抑制剂N-propyl-L-arginine（NPA）、NOS的非特异性抑制剂NG-硝基-L-精氨酸甲酯（L-NAME）阻断了IP后72h心肌保护作用。结论：IP后72h心肌保护作用依然存在,nNOS介导了心肌缺血预处理延迟性保护作用终末阶段,而与iNOS无关。 相似文献
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目的:本实验观察复心汤灌胃对大鼠心肌缺血模型的影响.方法:Wistar大鼠60只,雌雄各半,随机分成6组,每组10只.正常对照组:生理盐水灌胃;模型组:生理盐水灌胃;地奥心血康组:等效剂量地奥心血康灌胃(0.12g/kg/d);复心汤高剂量组:6倍等效剂量灌胃(81g/kg/d);复心汤中剂量组:3倍等效剂量灌胃(40.5g/kg/d);复心汤低剂量组:等效剂量灌胃(13.5g/kg/d).每日早晚各一次,连续7天.第8天除正常对照组外,其余各组于给药1小时后,用垂体后叶素(Pituitrinum,pit)制备心肌缺血模型.观察大鼠的心电图(ECG)、心肌组织乳酸脱氢酶(LDH)和肌酸激酶(CK)含量的改变、左室压力下降最大速率(?dp/dtmax)、左室舒张末压(LVEDP)的变化.结果:与模型组比较,复心汤各剂量组和地奥心血康组表现出显著对抗作用(P<0.05,P<0.01).与正常组比较,模型组大鼠CK及LDH活力显著升高,具有极显著性差异(P<0.001).结论:复心汤有治疗和预防心肌缺血的作用,对于心脏舒张功能的防治亦有明显的作用. 相似文献
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目的:探讨不同时相探讨山茶花提取物(extract of Camellia japonica L,ECJ)预处理对小鼠缺血再灌注损伤的影响。方法:线栓法制备小鼠缺血再灌注模型(MCAO),观察不同时相ECJ预处理后小鼠大脑中动脉缺血再灌注致脑梗死面积、血清中乳酸脱氢酶(LDH)和丙二醛(MDA)含量等指标的变化。结果:ECJ预处理延迟时相能明显减少脑梗塞面积并可明显降低血清中LDH活性、MDA的含量。结论:ECJ预处理延迟时相对小鼠脑缺血再灌注损伤有一定的保护作用。 相似文献
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刺激κ-阿片受体诱导的延迟性心肌保护作用 总被引：1，自引：0，他引：1
本研究利用-κ阿片受体激动剂U50488H预处理(U50488Hpretreatment,UP)大鼠,在离体Langendorff灌流心脏和缺血/复灌模型上观察-κ阿片受体激动剂诱发的延迟性心肌保护作用,研究结果表明U50488H预处理大鼠24h后,可明显改善心肌缺血后的复灌期内LVEDP的抬高,以及LVDP和±dP/dtmax的下降(P<0.05);其作用可被κ阿片受体选择性拮抗剂Nor-binaltorphimine(nor-BNI)所阻断。结论:刺激-κ阿片受体诱导了延迟性心肌保护作用。 相似文献
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目的:研究肢体缺血预处理(LIP)对大鼠缺血再灌后心脏损伤的影响。方法:采用反复捆绑后肢造成缺血预适应的方法,观察其对心肌缺血再灌后梗死面积和形态学改变的影响,对心肌CK-MB和cTn-I的影响,以及对抗氧化物酶的影响。结果:与缺血再灌组比较,预处理能明显降低心肌梗死面积,减轻心肌细胞的损害,减少心肌酶的漏出并能提高SOD的活性。结论:LIP对心肌损伤具有保护作用。 相似文献
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目的:观察二氢石蒜碱(dihydrolycorine,DL)对大鼠局部脑缺血/再灌注损伤的治疗作用和可能机制。方法:线栓法制备右侧大脑中动脉局灶性脑缺血模型,缺血1 h再灌注24 h。SD大鼠随机分为假手术组、模型组和DL低、中、高剂量组,于大鼠脑缺血后即刻及复灌后11 h及23 h DL组腹腔注射DL(10,20,40 mg.kg-1)治疗,假手术组和模型组则注射生理盐水对照。观察不同剂量DL对脑缺血再灌注大鼠神经功能状态、脑梗塞面积、脑水肿程度和脑组织髓过氧化物酶(myeloperoxidase,MPO)活性的影响。结果:脑缺血后给予DL可明显降低缺血侧脑梗死及脑水肿程度,使神经病学症状得到明显改善,降低缺血再灌注损伤后脑组织内MPO的活性(P<0.05)。结论:DL对脑缺血/再灌注损伤具有治疗作用,可能与其减轻脑缺血再灌注所致脑组织的炎症反应有关。 相似文献
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本研究利用κ-阿片受体激动剂U50488H预处理(U50488H pretreatment,UP)大鼠,在离体Langendorff灌流心脏和缺血/复灌模型上观察κ-阿片受体激动剂诱发的延迟性心肌保护作用,研究结果表明U50488H预处理大鼠24h后,可明显改善心肌缺血后的复灌期内LVEDP的抬高,以及LVDP和±dP/dtmax的下降(P＜0.05);其作用可被κ阿片受体选择性拮抗剂Nor-binaltorphimine(nor-BNI)所阻断.结论刺激κ-阿片受体诱导了延迟性心肌保护作用. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献