大鼠急性大强度运动时血浆睾酮变化及其机理

采用实验方法,对两组大鼠大强度运动时血浆睾酮变化及其机理进行探析。结果显示,运动组大鼠的血浆睾酮及睾丸中17β-羟类固醇脱氢酶活性浓度显著高于对照组,两组的血浆黄体生成素和红细胞压积无显著差异。提示,经8周耐力训练的大鼠,急性大强度运动后血浆睾酮升高。这可能是睾丸中合成、分泌增加的结果。     

浅谈空调技术的新进展

该文介绍了几种新型空调技术的特点及发展趋势     

大强度游泳抑制小鼠骨骼肌谷氨酰胺合成酶活性

分析不同强度运动负荷对血浆和骨骼肌谷氨酰胺水平变化与骨骼肌谷氨酰胺合成酶活性变化，探讨运动影响血浆谷氨酰胺水平变化的机制。BAL/C小鼠不负重或2%负重不同强度游泳，每天2h，持续8周。与对照组比较，大强度游泳组动物血浆（0.46±0.10、0.12±0.02mmol/L，p<0.01）和肌肉（4.92±0.98、1.03±0.37mmol/L，p<0.01）中的谷氨酰胺浓度降低，骨骼肌谷氨酰胺合成酶活性抑制(1874±191、1246±220nmol/min/g蛋白,p<0.01)；而中等强度游泳升高血浆谷氨酰胺浓度(0.64±0.06mmol/L,p<0.01)。小鼠在中等强度运动时，谷氨酰胺代谢表现了积极的代偿变化。但在大强度运动时，动物的体重增长减缓，血浆和肌肉谷氨酰胺水平均大幅度降低。结果提示，导致血浆谷氨酰胺水平降低的机制之一是骨骼肌中的谷氨酰胺合成酶抑制。     

冬泳对老年人红细胞SOD活力的影响

】对１２名冬泳爱好者安静时和一次定量冬泳后红细胞ＳＯＤ活力及血浆ＭＤＡ含量进行了测定。结果显示：冬泳锻炼可以提高老年人红细胞ＳＯＤ的活力，增强红细胞抵御氧自由基损伤的能力。     

体育锻炼对老年人血清某些微量元素和脂质代谢的影响

对60名不同身体状况老年人的血清Zn、Cu等微量元素和TC、Ch、HDL、LDL等的测定结果表明,高血脂症患者血清Zn/Cu比值明显升高,而血浆HDL/Ch比值、HDL/LDL比值明显下降;长期坚持体育锻炼,可使血清某些微量元素、血浆脂质和脂蛋白向有益于机体健康的方向转化,这对防止或减轻AS的发生和发展有积极作用。     

人体血浆中Tb(Ⅲ)物种的计算机模拟研究

建立了人体血浆多相模型,研究了人体血浆体系中Tb(Ⅲ)物种的分布.结果表明,Tb(Ⅲ)的物种形式随着Tb(Ⅲ)的量浓度的变化而变化.当Tb(Ⅲ)的量浓度低于4.000×10-8mol/L时,大部分Tb(Ⅲ)物种以可溶态存在;当Tb(Ⅲ)的量浓度高于4.000×10-8mol/L而低于1.667×10-2mol/L时,沉淀物种(TbPO4和Tb2(CO3)3)成为Tb(Ⅲ)的主要物种.可溶的Tb(Ⅲ)在量浓度低于1.0×10-4mol/L时,主要与运铁蛋白键合,分布于[Tb(Tf)]中;当Tb(Ⅲ)的量浓度高于1.0×10-4mol/L时,运铁蛋白耗尽,可溶的Tb(Ⅲ)主要分布于[Tb(HSA)],[Tb2(Tf)],[Tb(Ox)]和[Tb(Cit)]等物种中.     

基于变异系数的国际食品冷链发展水平对比

构建食品冷链发展水平指标体系,并基于变异系数确定食品冷链各指标权重,以美国为标准发展基准建立国际食品冷链发展指数。以2016年各指标截面相关数据分析国际食品冷链发展水平的影响因素,研究国际食品冷链的差异性。结果表明,相对于美国,日本农业冷链发展水平指数为0.6413,德国为0.6303,中国为0.4363。     

Temperature in High Temperature SHPB Experiments

As an experimental technique, it’s desired that the temperature in specimen is uniform in high temperature split Hopkinson pressure bar (SHPB) experiments. However, the temperature in specimen decreases and the temperature of bars increases when specimen starts to contact with bars, which induces the nonuniform temperature distribution in specimen, and may result in inac-curacy of experimental results. In this paper, the temperature distributions of specimen and bars in high temperature SHPB experiments were investigated while the specimen was heated alone. Firstly, the temperature history of specimen was measured at different initial temperatures by ex-periments, then simulation was carried out. Simulation results were consistent with experimental results by adjusting the thermal contact coefficient between specimen and bars. By this way, the thermal contact coefficient and simulation results were validated, and the proper cold contact times of specimen and bars in high temperature SHPB experiments were discussed. Finally, the results were compared with those in references.     

卡布里鹰嘴豆微量元素含量的分析测定

测定分析卡布里鹰嘴豆微量元素含量。用电感耦合等离子发射光谱法测定卡布里鹰嘴豆17种微量元素的含量。新疆乌什县产的卡布里鹰嘴豆富含镁、铁、锰、锌、铜等有重要生理活性的微量营养元素,是营养价值极高的豆类作物。从微量元素角度分析,卡布里类型鹰嘴豆是极具开发推广价值的药食两用豆类作物。     

μ 子催化核聚变中飞秒激光辐照下μ 子的运动

Introducing a superintense femtosecond laser pulse in the muon-catalyzed fusion （μCF） target, taking the mixture after fusion reaction as a overdense plasma, and based on the Newton classical equations, the paper studies the movement of muon in the plasma. Muon drift along the direction of laser propagation remains even at the end of the laser pulse. At the peak laser intensity of 1021 W/cm^2, muon goes from the skin layer into field-free matter in a short time much less than the pulse duration, before the laser pulse reaches its peak value. According to the calculated results, when the laser intensity reaches 1023 W/cm^2, the relativistic muon drift should be considered. Influence of the laser on other particles in the plasma is small. Hence, this method can avoid muon sticking to alpha effectively and reduce muon-loss probability in μCF：