共查询到12条相似文献，搜索用时 62 毫秒
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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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尹洪磊 《赤峰学院学报(自然科学版)》2005,21(5):88-88,127
研究阵发性折返性室上性窄QaS波心动过速终止后倒置T波的临床意义．对71例自发折返性室上性窄QRs波心动过速终止后倒置T波的患者行运动心电图试验、运动铊心肌灌注显像夏冠状动脉造影．结果：心动过速终止后，30例出现倒置T波，3例呈铊阳性改变的病例冠状动脉造影显示1支血管管腔直径≥75％的明显狭窄，但均无冠心病的临床表现．结论：阵发性折返性室上性窄QaS波心动过速终止后倒置T波代表一种常见的现象，可能持续存在一段时间，根据常见的临床和心电图指标不能预测其是否发生．冠心病似乎不是这种复极异常的原因． 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 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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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 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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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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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 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