排序方式: 共有45条查询结果,搜索用时 170 毫秒
1.
Masataka Umeda Wanseok Lee Courtney A. Marino Shelby C. Hilliard 《Journal of sports sciences》2016,34(5):467-476
This study examined the potential influence of moderate intensity physical activity (PA) levels and gender on central pain modulation using conditioned pain modulation (CPM) in healthy men and women. Twenty four individuals (12 men and 12 women) who reported engaging in the moderate intensity PA for 150 min or more per week and 24 individuals (12 men and 12 women) who reported engaging in moderate intensity PA for 60 min or less per week completed a self-report PA questionnaire and a 7-day PA assessment using an accelerometer. Furthermore, the participants completed the CPM testing to evaluate the efficiency of central pain modulation. The active individuals scored higher on the PA questionnaire and spent more minutes for light, lifestyle, moderate and vigorous intensity PA than the less active individuals. The active men and women exhibited comparable magnitudes of CPM, and showed a greater magnitude of CPM when compared to their less active counterparts. However, these beneficial effects of higher dose moderate intensity PA disappeared when time spent for vigorous intensity PA was statistically controlled for. These results suggest that the higher dose moderate intensity PA does not add to the benefits from vigorous intensity PA to further improve central pain modulatory systems. 相似文献
2.
介绍了一种已实现工业应用的磨砂型材生产工艺。在前人研究的基础上 ,根据铝的性质 ,从碱液浓度、温度、络合、整平等方面进行试验 ,发展了砂面剂。介绍了砂面剂中部分物质的作用 相似文献
3.
4.
目的:制作乳腺癌调强放疗计划时,采用分段逆向调强优化方法以达到更好的靶区剂量和保护肺、心脏等危及器官。方法:应用Eclipse8.6计划系统针对10例乳腺癌患者(肿瘤原发部位左右侧各5例)分别制定T1,T2模式调强放疗计划,处方剂量均为DT50Gy/25次。T1模式采用左乳300°、330°、0°、30°、60°、90°和120°方向射野,右乳60°、30°、0°、330°、300°、270°和240°方向射野,设置优化参数进行逆向优化和剂量运算。T2模式采用与T1模式相同的角度方向设野,第一段总剂量24Gy,分次剂量2Gy,分12次治疗,设置优化参数进行逆向优化和剂量运算;第二段总剂量26Gy,分次剂量2Gy,分13次照射,设置优化参数,采用"Base dose plan"功能选择基于第一段治疗计划以总量50Gy来逆向优化和剂量运算。将两段计划相加作为T2模式的治疗计划,通过剂量体积直方图比较两种模式下计划的靶体积和危及器官剂量分布。结果:T1、T2模式调强放疗计划的靶体积均满足临床剂量要求,对于左侧乳腺癌,适形指数分别为0.727±0.034、0.751±0.034(t=-6.20,P=0.003);对于右侧乳腺癌,适形指数分别为0.691±0.058、0.729±0.048(t=-5.39,P=0.006)。对左侧乳腺癌,T2模式的左肺V10(%)、左肺V20(%)、左肺V30(%)、全肺V10(%)、全肺V20(%)、全肺V30(%)和心脏V10(%)均大于T1模式,分别增大5.0%、2.7%、3.7%、4.6%、2.6%、3.8%和4.4%。对于右侧乳腺癌,无充分证据说明危及器官各指标有差别。结论:与T1模式相比,采用分段逆向调强优化方法能更好的优化靶区的剂量分布,但对左侧乳腺癌而言,会略微增加左肺、全肺和心脏剂量受量。 相似文献
5.
Farhana Zahir Shameem J Rizvi Soghra K Haq Rizwan H Khan 《Indian journal of clinical biochemistry : IJCB》2006,21(2):149-152
Mercury pollution and acute neurotoxicity of mercury is well known. The recent reports suggest the adverse effect of low dose
mercury, though the available literature is still silent on its mechanism. This study was therefore undertaken to probe the
effect of low dose methyl mercury induced heavy metal toxicity on free radical stress and its impact on behaviour of male
albino rats. Male albino rats were exposed to 1 mg/kg body wt of methylmercury chloride for seven days, on day 8 they were
tested for motor and memory functions. They were sacrificed later for biochemical estimations for rate of lipid peroxidation,
nucleic acids, proteins in cerebrum, cerebellum and brain stem. There was an increase in the rate of lipid peroxidation showing
methyl mercury induced free radical stress. The motor and memory functions demonstrated a clear decline, besides there was
a lowering in the levels of nucleic acids and proteins as compared to controls. The results are important in view of recent
reports that methyl mercury induced free radical stress results in early ageing and may serve as an initiating factor more
specifically for neurodegenerative disorders like Alzeihemer's disease and dementias. The current findings support the notion
that incorporating dietary antioxidants like curcumin, ascorbic acid and α-tocopherol in routine diet from early age may help
combat the risk of developing such disorders in ensuing years. 相似文献
6.
7.
寓惠时期, 苏轼在贫穷潦倒的磨难之中, 开始了全面的人生反思, 不断进行着自我精神的超越, 从哲理的高度来思考人生的价值和意义, 并把现实世界当作审美对象, 达到人格的理想境界, 实现人生的审美化, 从而展示出他作为庶族士大夫代表独特的人生理念与精神风貌。 相似文献
8.
9.
A dielectric breakdown phenomenon on polymer sur-faces calledtrackingfailure was observed[1].Itis caused bycarbonized conductive tracks formed on their surfaces .Whensufficientlyintensive discharge lasted for a consider-abletime ,the decomposedcarbon prod… 相似文献
10.
采用高能电子束辐照处理四株不同的酵母菌株 ,筛选赖氨酸含量较高的突变株并研究电子束对酵母的辐照效应 .试验表明 :电子束处理酵母的最佳剂量为 4 .14~ 4 .83k Gy,临界致死剂量为6.8k Gy,起始剂量为 0 .69k Gy,不同菌株对电子束的敏感性不同 ,其敏感性强度分别为产朊假丝酵母 >产香酵母 >热带假丝酵母 >面包酵母 .发酵试验表明 :不同剂量的电子束处理酵母 ,其胞外赖氨酸含量都发生不同程度的变异 ;其变异幅度为 84~ 2 90μg/ ml,经电子束处理的酵母其胞外赖氨酸含量比出发菌株赖氨酸含量平均提高 10 .9% .在剂量为 4 .83k Gy,致死率 80 %的条件下 ,酵母胞外赖氨酸变异幅度最广 ,产生高赖氨酸菌株的突变株比例为最大 ,达到 16.5% (胞外赖氨酸含量在 1.4 mg/ ml以上 ) ,在突变体选育方面具有较大的可选择性和可行性 ,为该菌的菌种改良提供了一条遗传育种的途径 相似文献