共查询到20条相似文献，搜索用时 62 毫秒
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目的:利用Bannisterr建立的颈动脉引流法制作大鼠急性脑缺血再灌注模型研究缺血预处理对一氧化氮(NO)代谢的影响.方法:将18只大鼠分为模型组、缺血预处理(IPC)组和对照组,观察血清和脑皮质中NO的变化.结果:模型组大鼠脑内及血清NO水平升高,较对照组有统计学差异(P＜0.01).IPC组和模型组相比血浆中NO含量增加(P＜0.01),脑皮质中NO含量降低(P＜0.01).结论:缺血预处理可通过抗自由基功能影响NO代谢并保护神经细胞. 相似文献
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王连全 《中国教育研究与创新》2004,1(5):61-62,88
本文提出NO的免疫作用及其表达形式，阐述了NO参与肝病、胰病、哮喘病、动脉硬化、高血压病和脑病的免疫，当机体NO分泌减少时易引起机体免疫功能下降而患发疾病。 相似文献
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代书新 《淮北职业技术学院学报》2006,5(3):80-80
1、NO的生化生理特性体内多种组织细胞中均存在NO合酶(NO S),包括血管内皮细胞、巨噬细胞、中性粒细胞、血小板、中枢及外周神经系统。NO在体内的生理作用非常广泛,对血液循环系统的正常功能起重要的调节作用,包括:(1)调节血管张力。血管内皮细胞在基础状态下可持续释放NO,以维 相似文献
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目的：通过对中风患者针刺治疗结合功能锻炼前后血浆SOD、ET、NO含量的观察,提出本治疗方法对中风治疗的有效性;方法：在治疗中风病的后期,利用康复训练中的功能锻炼方法促进中风患者的技能恢复,并对技能恢复情况作出了一定的评价;结果：针灸方法能有效调节血管张力,改善脑组织的血流量,减轻脑细胞的损伤程度,从而改善中风患者的肢体运动和言语功能;合理地运用康复训练方案,能调动机体内部潜能,调节神经中枢的兴奋性,促进新的神经元网络的建立,调动处于储备休眠状态的神经元发挥代偿作用,使患者得到最大程度的康复。结论：针刺结合康复训练能改善患者血浆SOD、ET、NO含量指标,促进中风患者的技能恢复。 相似文献
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复旦大学神经生物学研究所4月20日正式挂牌成立，中科院院士杨雄里任首任所长。该研究所现阶段主要从事突触传递与调控、感觉信息处理以及脑的高级功能等研究。目前该所承担着多项科技部和上海市的重大科研项目，其中杨雄里院士为国家“973”项目“脑功能和脑重大疾病的基础研究”首席科学家。 相似文献
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神经系统的NO及其生物学功能 总被引：3，自引：0，他引：3
神经系统中的一氯化氮(NO)是一种气体型信使分子，在一氧化氮合酶(NOS）的催化下产生，具独特的作用特点，有许多重要的生物功能。NO作为外周神经递质主要在植物神经中起作用，也在外周感觉传入中发挥作用；NO还参与神经系统的发育；影响神经递质的释放；在中枢神经系统，NO作为逆行信使参与长时程增强和长时程抑制的诱导和维持，在学习和记忆中发挥作用；但当NO过量时会导致神经毒性，从而在神经疾病中起作用。 相似文献
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Th17细胞和Treg细胞是CD4+T细胞的新亚群,在分化发育、功能发挥的过程中受到Th1型、Th2型效应细胞以及自身分泌产生的细胞因子的调节,参与自身免疫、感染、肿瘤等疾病的发生发展.Th17/Treg细胞失衡在许多免疫性疾病的发病机制中发挥重要作用.通过对Th17和Treg分化发育和功能发挥过程中的关键调节因子进行阻断或加强,可以上调或下调Th17细胞和Treg细胞在疾病中的表达,以用于疾病的预防和诊治. 相似文献
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目的：讨论经颅多普勒超声（TCD）在脑动静脉畸形的临床应用价值既对病人的初筛．方法：用TCD对几年来就诊病人中发现的8例脑动静脉畸形病人进行总结．用4MHz连续波探头分别查颈部的颈总动脉、颈外动脉、颈内动脉、锁骨下动脉．用2MHz探头分别监测颅内大脑中动脉、大脑前动脉、颈内动脉末端、大脑后动脉同时进行压颈试验和二氧化碳反映试验及脑血流自定调节功能检测。结果：用TCD检查后发现了供血动脉高流速低搏动指数的频谱及对二氧化碳反应性和脑血流自动调节功能降低,发现了血流速增高和搏动降低与血管床有直接关系,血管床越大,血流速越快,发现了ArM对脑血流的自动调节功能扣二氧化碳反应性降低时动静脉畸形比较特异的指标．讨论：目前,脑动脉畸形患者日趋增多,用TCD检查快捷方便,对病人无损害经济实惠,对进一步脑血管造影进行初筛． 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 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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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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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
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献