Influence of moderate intensity physical activity levels and gender on conditioned pain modulation

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.     

铝型材碱蚀砂面工艺的研究与应用

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     

宁夏太阳辐射资源时空变化规律研究

本文用功率谱方法和最小二乘法研究了宁夏太阳辐射资源的时空变化规律。研究结果表明，太阳辐射资源在空间变化上呈现出明显的地域分异规律，日照时数、日照百分率及太阳辐射总量在地区分布上呈现出明显的南少北多、南小北大的地域分异规律；太阳辐射资源呈现出明显时间变化规&功率谱、最小二乘法、太阳辐射资源、宁夏     

60Coγ射线对红掌组培材料的辐射效应研究

以不同梯度辐射剂量的60Coγ射线处理红掌"阿拉巴马"品种的愈伤组织及组培苗,并对处理过的愈伤组织诱导植株再生和移栽。结果表明:在试验处理剂量范围内,随着辐射剂量的加大,红掌愈伤组织及组培苗的生长受抑制程度加深;愈伤组织的半致死剂量为20～30Gy;组培苗的半致死剂量为30～40Gy;辐射后的再生植株矮小且生长缓慢。     

分段逆向调强优化方法在乳腺癌调强放疗计划设计中的应用研究

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。     

Effect of methyl mercury induced free radical stress on nucleic acids and protein: Implications on cognitive and motor functions

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.     

若干因素对铬天青-S显色的影响

研究了室温、缓冲液两种pH值、显色时间、显色剂量对食品中铝测定的铬天青-S显色的影响;铝含量和吸光度之间的线性关系.结果显示：室温从21℃升高到33℃,吸光度相应增加;pH5.7缓冲液较pH5.5的吸光度轻微增加;加入铬天青-S20分钟后至45分钟内显色稳定;将显色剂量减半后吸光度稍微降低,显色效果改善;铝含量在0.5-6μg/ml范围内与吸光度之间线性关系良好;铝含量增至8μg/ml时失去线性关系;方法的重复性较好.     

简论苏轼寓惠时期的审美人格

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。     

电四极和磁四极辐射的SO(2)对偶理论

在Dirac磁单极存在的情况下,考虑保持Maxwell方程双矢势下的电磁对偶性.利用有磁荷存在的d’Alembert方程推迟解,求出了带磁荷粒子和双荷拉子的电磁辐射的表达式。最后得到了电四极和磁四极辐射双矢势下表达式,并对电多极和磁多极辐射问题进行了讨论。     

不同条件对聚醚砜膜γ辐射接枝甲基丙烯酸接枝率的影响

利用γ射线共辐照技术在聚醚砜膜上接枝了甲基丙烯酸.通过改变溶剂、辐照剂量、辐照剂量率等条件,获得了具有不同接枝率的改性聚醚砜膜,提高接枝率有助于改善聚醚砜膜的亲水性.实验结果表明,提高单体浓度、使用混合溶剂(如水和乙醇按一定比例混合),有利于提高接枝率.研究还发现,超过2 kGy的辐照剂量会导致接枝率降低.