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.     

Physical activity - an important preanalytical variable

The concentration of several biochemical and hematological biomarkers is strongly influenced by a number of preanalytical variables. Several lines of evidence attest that short, middle, and long-term exercise, as well as the relative intensity of physical effort (from mild to strenuous), may influence a broad array of laboratory variables. The amount of extracellular release and clearance from blood of most of these biomarkers is markedly influenced by the biological characteristics of the molecule(s), level of training, type, intensity and duration of exercise, and time of recovery after training. It is hence noteworthy that test results that fall outside the conventional reference ranges in athletes not only may reflect the presence of a given disease, but may frequently mirror an adaptation to regular training or changes that have occurred during and/or following strenuous exercise, and which should be clearly acknowledged to prevent misinterpretation of laboratory data. The aim of this narrative review is to provide an update about the most significant changes of some biochemical and hematological biomarkers in response to physical exercise, for appropriate interpretation of these changes in the context of physically active subjects.     

The acute effects of resistance exercise on the main determinants of blood rheology

The aim of this study was to examine short-term changes in blood rheological variables after a single bout of resistance exercise. Twenty-one healthy males completed three sets of 5?–?7 repetitions of six exercises at an intensity corresponding to 80% of one-repetition maximum (1-RM). The average duration of the exercise bout was 35?min. Venous blood samples were obtained before exercise, immediately after exercise and after 30?min of recovery and analysed for lactate, red blood cell count, haematocrit, haemoglobin, plasma viscosity, fibrinogen, total protein and albumin concentration. Plasma volume decreased 10.1% following resistance exercise. This occurred in parallel with an increase of 5.6%, 5.4% and 6.2% in red blood cell count, haemoglobin and haematocrit; respectively. Plasma viscosity increased from 1.55?±?0.01 to 1.64?±?0.01 mPa?·?s immediately after resistance exercise before decreasing to 1.57?±?0.01 mPa?·?s at the end of the recovery period. Similarly, fibrinogen, albumin and total protein increased significantly following resistance exercise. However, the rises in all these rheological parameters were transient and returned to pre-exercise values by the end of recovery. We conclude that a single session of heavy resistance exercise performed by normal healthy individuals alters blood rheological variables and that these changes are transient and could be attributed to exercise-induced haemoconcentration.     

低温等离子体与催化剂氧化脱除甲醛的研究

分别采用等离子体与不同催化剂相结合对空气中甲醛的脱除进行实验研究。结果表明,Ag/CeO2催化剂能与等离子体结合高效氧化脱除甲醛,当气体组成为276×10-6HCHO、21%O2,1%H2O,N2为平衡气,空速为16 500 h-1、温度为70℃、压强为一个大气压、输入放电能量密度为108 J.L-1时,99%的甲醛被脱除,86%的甲醛被氧化成CO2。而在同样的条件下,Fe/TiO2和γ-Al2O3催化剂对甲醛的脱除率只为86%和78%。     

等离子体隐身翼面的电磁散射特性研究

设计了一种等离子体隐身翼面结构,采用时域有限差分方法对翼面的电磁散射特性进行了计算和分析,以翼面后向散射最小化为目标,对等离子体的碰撞频率、填充位置以及前缘玻璃钢蒙皮的相对介电常数进行了优化设计。研究表明,优化后的等离子体隐身翼面较全金禹翼面,可在全向上实现雷达散射截面的减缩,后向散射的减缩值可达22．56dB。     

大气压冷等离子体提高乙醇转化率的实验参数优化研究

以酿酒酵母(Saccharomyces cerevisiae)为研究对象,研究大气压冷等离子体激活酿酒酵母提高乙醇转化率的工艺条件。在单因素实验基础上,选取等离子体处理时间、等离子体电源电压和处理菌液体积为影响因子,以乙醇转化率为响应值,应用Box-Behnken中心组合实验建立数学模型,进行响应面分析。结果表明,大气压冷等离子体提高乙醇转化率的最佳实验参数为:处理时间1 min,电源电压24 V,处理菌液体积9 mL。在此条件下,乙醇转化率达到0.58 g/g,比未处理过的酿酒酵母发酵葡萄糖生成乙醇的转化率高23.6%。     

中国成年人血浆内皮素含量参考值的地理分布规律

通过收集88个单位测定7815例成年人血浆内皮素（ET）含量参考值,应用SPSSl9．0统计软件,运用相关分析和回归分析的方法,研究与7项地理因素指标的关系,以为制定中国成年人血浆内皮素（ET）含量参考值的统一标准提供科学依据．结果发现成年人血浆内皮素（ET）含量参考值与地理因素之间有显著的相关关系（F=2．232,P=0．041）．用逐步回归分析的方法推导出了一个回归方程：Y=33．422＋0．008Xl-0．001X2-0．005X4＋0．004X5＋0．073X6＋3．720X7±0．988．在以上回归方程中,Y是成年人血浆内皮素（ET）含量参考值（pg／mL）,X,是海拔高度（m）,如是年日照时数（h）,墨是年平均相对湿度（％）,墨是年降水量（mm）,X6是气温年较差（℃）,玛是年平均风速（m／s）;0．988是剩余标准差的值．如果知道了中国某地的地理因素,就可以用回归方程计算这个地区的成年人血浆内皮素（ET）含量参考值．依据成年人血浆内皮素（ET）含量参考值与地理因素的依赖关系,把中国分为8个区．     

Study on Bombyx mori silk treated by oxygen plasma

Study of the morphology, aggregation structure and properties ofBombyx mori silk treated by low temperatureoxygen plasma showed that slight flutes appeared on the surface of Bombyx mori silk fiber and that its surface structurechanged after plasma treatment. The conformation also changed and crystalline degree decreased. The stannic filling rate oftreated fiber was improved. Because of etching, the weight of the fiber decreased but the breaking strength changed littleafter short-time treatment.     

等离子显示中运动伪像的准确估计

针对目前等离子显示屏普遍存在的运动伪像问题,提出了一种新颖的模拟计算方法,该方法实现了对等离子体显示屏运动伪像的准确、快速估计.该方法通过测量等离子显示屏不同颜色不同灰度下光信号随时间的变化情况,仿真人眼对运动图像的视觉感知行为,模拟计算出任意图像以一定速度运动下的视觉感知效果.新算法不但加入了等离子显示屏荧光粉的延迟效应的影响,而且提高了模拟计算速度.所得模拟结果与实际主观视觉感知实验相符.这种快速准确的估计使对等离子显示器件运动伪像的客观评价成为可能.     

相对论性等离子体中平均洛仑兹因子

文章给出入射激光强度与电子洛仑兹因子的关系,然后根据统计力学的方法,导出相对论等离子体中平均洛仑兹因子与温度参量之间的关系,同时利用数值计算得到其关系曲线和拟合函数.