热休克反应对急性运动大鼠心肌自由基代谢的影响   总被引：3，自引：0，他引：3  

李建平  张葆欣  王瑞元  叶春 《北京体育大学学报》2004,(2)

目的:探讨热休克反应对急性运动大鼠心肌自由基代谢的影响。方法:SD大鼠随机分为:室温安静组,室温运动组,热休克反应安静组,热休克反应运动组。热休克反应组进行热暴露处理;热暴露处理24h后,运动组大鼠进行一次急性运动,急性运动结束16h后取样。检测各组心肌组织中MDA含量和SOD的活性,检测安静组心肌组织HSP72的含量。结果:1)与室温安静组相比,热休克安静组大鼠心肌组织中的HSP72浓度显著升高(P<0.01);热休克反应安静组大鼠心肌SOD活性升高、MDA含量降低,与室温安静组相比变化不明显(P>0.05)。2)热休克反应运动组心肌MDA含量显著低于室温运动组(P<0.01),SOD活性高于室温运动组,但无统计学意义(P>0.05)。结论:热休克反应可减轻急性运动所致大鼠心肌组织SOD活性下降的程度,抑止MDA含量的升高。说明热休克反应预处理能够减轻急性运动大鼠心肌的抗氧化能力,减少自由基的生成,减轻自由基所致的损伤,对急性运动所致心肌损伤具有一定的保护作用。  相似文献   

湘西南侗族青少年足型的研究   总被引：1，自引：0，他引：1  

王京琼  皮建辉  张惠春 《中国体育科技》2002,38(4):61-64

为了解湘西南侗族青少年足型及其发展趋势 ,按活体测量要求 ,对湖南省通道和靖州侗族自治县 1343名侗族青少年 (7～ 18岁 )的足长、足宽进行了测量 ,并按足宽足长指数进行分类 ,结合文献资料调研和数理统计法对数据进行整理分析。研究结果表明 :侗族青少年的足长、足宽分别随年龄增长而增长 ,16岁时接近成人水平 ;足长与足宽之间存在正相关 ;足型以中间型最多 ;侗族与汉族青少年足型分布差异无显著意义 ,与畲族青少年足型分布的差异非常显著  相似文献   

实轴增量式光电编码器测量电路的设计   总被引：1，自引：0，他引：1  

李劲松 《实验室研究与探索》2007,26(2):12-15

介绍了如何设计增量式光电编码器的输出信号处理电路,并从该电路设计的四个方面着手,较为详细地阐述了电路组成的构思、设计及实现过程。  相似文献   

Sojourner reentry: a grounded elaboration of the integrative theory of communication and cross-cultural adaptation     

Margaret Jane Pitts 《Communication monographs》2016,83(4):419-445

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A descriptive study of step alignment and foot positioning relative to the tee by professional rugby union goal-kickers     

John Cockcroft 《Journal of sports sciences》2016,34(4):321-329

This study describes foot positioning during the final two steps of the approach to the ball amongst professional rugby goal-kickers. A 3D optical motion capture system was used to test 15 goal-kickers performing 10 goal-kicks. The distance and direction of each step, as well as individual foot contact positions relative to the tee, were measured. The intra- and inter-subject variability was calculated as well as the correlation (Pearson) between the measurements and participant anthropometrics. Inter-subject variability for the final foot position was lowest (placed 0.03 ± 0.07 m behind and 0.33 ± 0.03 m lateral to the tee) and highest for the penultimate step distance (0.666 ± 0.149 m), performed at an angle of 36.1 ± 8.5° external to the final step. The final step length was 1.523 ± 0.124 m, executed at an external angle of 35.5 ± 7.4° to the target line. The intra-subject variability was very low; distances and angles for the 10 kicks varied per participant by 1.6–3.1 cm and 0.7–1.6°, respectively. The results show that even though the participants had variability in their run-up to the tee, final foot position next to the tee was very similar and consistent. Furthermore, the inter- and intra-subject variability could not be attributed to differences in anthropometry. These findings may be useful as normative reference data for coaching, although further work is required to understand the role of other factors such as approach speed and body alignment.  相似文献   

热休克蛋白7O在乳腺癌和胃癌中的表达及其意义的研究     

程毅 魏贵亮周宁  吴迎爽谢震 祁贺薄爱华  张晓立邢立强 《河北北方学院学报(医学版)》2005,22(5):23-24

目的：探讨热休克蛋白70（HSP70）在人乳腺癌和胃癌中的表达及其意义。方法：应用免疫组织化学的方法对64例乳腺癌和55例胃癌组织中的HSP70进行检测。结果：（1）HSP70在乳腺癌和胃癌组织中的表达分别为78．13％．61.82％。（2）乳腺癌中HSP70的表达与乳腺癌的病理类型．淋巴结转移情况及年龄未发现显著差异（P〉0．05）。（3）胃癌中HSP70的表达与肿瘤浸润深度、淋巴结转移有密切关系（P〈0．05）。结论：HSP70在乳腺癌和胃癌中均呈较高水平表达．其中在胃癌中的表达与肿瘤浸润深度、恶性程度有密切关系,HSP70在乳腺癌和胃癌的发生发展中起重要作用。HSP70可能成为乳腺癌，胃癌的诊断指标之一。  相似文献   

羟乙基淀粉130/0.4复苏对失血性休克大鼠肺组织NF-κB的影响     

张富涛  邱建磊 《德州学院学报》2011,27(4):63-65,78

目的通过肺组织NF-κB的表达,研究羟乙基淀粉130/0.4复苏对失血性休克大鼠肺损伤保护作用的可能机制.方法健康雄性SD大鼠54只,体重230~280 g,随机分为3组：对照组（C组）、乳酸林格氏液复苏组（RL组）、6%羟乙基淀粉130/0.4复苏组（HES组）,按照Wiggers改良法复制失血性休克模型.于复苏后1 h、2 h4、h采用免疫组织化学的方法检测肺组织NF-κB的表达;光镜下观察肺组织形态学改变.结果 RL组与HES组肺组织NF-κB免疫组化染色细胞核阳性百分率较C组明显升高,RL组升高的程度较HES组明显（P〈0.01）.免疫组化染色光镜观察显示：HES组比RL组的组织损伤明显减轻.结论 6%羟乙基淀粉130/0.4复苏失血性休克可以抑制肺组织NF-κB活性,减轻休克及复苏过程造成的肺损伤.  相似文献   

36例糖尿病足的护理探讨     

卢惠萍  钱丹燕 《金华职业技术学院学报》2007,7(6):59-61

目的:总结36例糖尿病足的护理。方法:采用皮肤护理、饮食护理、用药护理、创口护理、心理护理等多方位的护理。结果:感觉恢复正常21例,足溃疡治愈9例,控制感染2例,有效率88.9%。结论:采用多方位的护理,能有效降低本病并发症的发生率、致残率。  相似文献   

Experimental Study of Structure Shock Vibration in Soil Caused by Explosion of Conventional Weapons     

FENG Jinji  XIE Qingliang  ZHAO Dayong 《天津大学学报(英文版)》2006,12(Z1)

When hitting underground structures directly or exploding in rock-soil media near underground structures, the conventional weapons with large charge weight will make underground structures be subjected to strong shock vibration and cause personal casualty and damage of precision electronic equipments. The shock vibration has become one of the cardinal killing means of weapons. However, the existing methods of predicting structure shock vibration are limited evidently. In this paper the coupling coefficient of acceleration in clayey soil is obtained firstly. Subsequently based on repeated experiments of chemical explosion, after dimension analysis and by using method of multivariate stepwise regression, the calculation formulae of shock vibration acceleration for the underground structure are obtained finally. The formulae consider top and side explosion respectively, taking into account the effects of penetration depth, charge weight, distance to explosion center, rock-soil media, size of structure and buried depth. They are easy to use with high practicability and degree of confidence, and can provide credible evidence for prediction of shock vibration and vibration isolating design of underground structure.  相似文献   

/r/音位的多重角色及其动因     

黄小萍 《华侨大学学报(哲学社会科学版)》2011,(2):116-125

首先分析带r音的和不带r音的口音的演变过程和动因,接着分析/r/从辅音演变成元音在发音、分布和音系学方面的动因,最后解释＂连音变读＂r现象。分析显示带r音的与不带r音的口音的区别在于后者处在词中弱读位置的/r/的发音不同,在辅音前或词尾的/r/蜕化成央元音//并入前面音节的核心,形成–r音节和–re音节,而带r音的口音中辅音前和词尾的/r/发卷舌音。/r/和//具有共同的底层形式,作首音为/r/,处在韵中则为//。/r/的发音特性、音段响度、在音节和音步的位置以及音节分析和轻重音节能解释处于各种位置的/r/和/r/的变体以及/r/与//的关系。  相似文献