大理市市售部分染发剂中铅含量测定分析

目的:了解大理市市售部分染发剂中铅的含量.方法:以火焰原子吸收光谱法在283.3nm波长处测定大理市市售的随机抽取的5种不同品牌33个染发剂样品中铅的含量.结果:5种不同品牌33个样品中铅的含量为:0～0.782 μg/g,平行实验相对标准偏差为0.060～0.263μg/g.结论:大理市市售的5种品牌染发剂铅含量均未超过国家标准,可以安全使用.     

方波溶出伏安法快速测定染发剂中对苯二胺

采用循环伏安法研究了对苯二胺在铂电极上的电化学行为。实验发现,在0.1 mol/LpH=6.0的磷酸盐缓冲溶液中,对苯二胺能在铂盘电极上产生良好的氧化还原峰,对苯二胺氧化还原峰峰电位分别为＋0.25 V和＋0.19 V（vs.Ag/AgC l,饱和KC l溶液）。考察了扫描速度和pH对峰电位和峰电流的影响,结果表明对苯二胺在铂盘电极上的电极反应属于等电子等质子反应,反应过程受吸附控制。基于此建立了方波溶出伏安法快速测定染发剂中对苯二胺的分析方法。该方法具有分析时间短、操作简单等优点。该方法的线性范围为3.24-108.14 mg/L,R=0.9990,检出限为1.1mg/L,浓度为43.2 mg/L时相对标准偏差（n=11）为1.57%,对4种市售染发剂中对苯二胺含量进行了测定,结果满意。     

DRM在广播节目传输中的应用

通过介绍西藏小功率中波、调频转播台在改善覆盖效果,提高边远地区综合覆盖率的特殊作用,并分析了其节目源单一依赖卫星的弊端.对DRM广播抗干扰、抗多径效应等的机理进行研究,提出对大功率发射台大功率中短波发射机进行DRM广播改造,用于节目源信号的传输,研究结果表明:DRM广播作为小功率中波、调频转播台的备用节目传输通路,成本低、可靠性高、易于实现.     

Hearing molecules: contributions from genetic deafness

Considerable progress has been made over the past decade identifying many genes associated with deafness. With the identification of these hereditary deafness genes and the proteins they encode, molecular elements of basic hearing mechanisms emerge. As functional studies of these molecular elements become available, we can put together the pieces of the puzzle and begin to reach an understanding of the molecular mechanisms of hearing. The goal of this review is to discuss studies over the past decade that address the function of the proteins implicated in genetic deafness and to place them in the context of basic molecular mechanisms in hearing. The first part of this review highlights structural and functional features of the cochlea and auditory nerve. This background will provide a context for the second part, which addresses the molecular mechanisms underlying cochlear function as elucidated by genetic causes of deafness. Received 20 September 2006; received after revision 24 October 2006; accepted 5 December 2006     

鄂西北食管癌高发区食管癌患者头发中微量元素的测定和比较研究

鄂西北食管癌高发区食管癌患者头发中微量元素的测定和比较研究龙际银,汪福意,卢汉兵,赵兰华,屈永年,冯安华（１）同济医科大学郧阳医学院２）华中师范大学分析测试中心３）丹江口市第一人民医院）关键词头发,微量元素,食管瘤,ＩＣＰ－ＡＥＳ中国分类号Ｏ５６７·...     

应用meso-四(4-氯-3-磺酸钠基苯基)卟啉测定人发中Pb2+的含量

研究了meso-四(4-氯-3-磺酸钠基苯基)卟啉与铅的显色反应.结果表明:不需加热即可完成络合,表观摩尔吸光系数为2.51×105L/(mol·cm),线性范围为0～0.6靏/mL,抗干扰能力强.用该方法测定人发中痕量铅,结果令人满意.     

香泉铊矿化区人体的铊含量特征及环境学意义

香泉铊矿床是安徽省近年来发现和正在勘探的大型铊矿床,为了研究自然状态下的铊矿床对人体及周围环境的影响,分别采集矿床附近和远离矿床的小山井村和大尹村村民(背景区)的尿液和头发,并对其中的铊含量进行测试。结果表明,小山井村村民的尿铊平均质量浓度为1.76μg/L,明显高于健康人群和背景区村民,而头发中铊平均质量比为3.13μg/kg,属于健康人群发铊质量比范围。研究表明,目前矿床中的铊尚未大量迁移进入环境而对村民健康产生明显的危害,但矿床附近村民已表现出铊污染的征兆;此外,本次研究也表明人发中铊含量高低不是铊污染的特征标志。     

蒙古族3个群体7项性状的基因频率

在内蒙古呼伦贝尔盟调查了蒙古族3个群体（巴尔虎人,厄鲁特人和布里亚特人）的发形,前额发际,上眼睑褶皱,蒙古褶,耳垂类型,鼻梁侧面观,鼻孔类型等7,项性状,并计算了基因频率,结果显示：上眼睑褶皱,蒙古褶,耳垂类型的显性基因频率高于隐性基因频率,与兴安盟蒙古族相比,呼盟蒙古族鼻粱侧面观,耳垂类型显性基因频率较高,另5项特征显性基因频率较低。     

体育防护用品的压力舒适性及运动功能性探讨

探讨服装压对体育防护用品运动功能及穿着舒适性的影响.通过实验得出以下结论(1)人体皮肤对服装压的主观感受随着受压强度、作用时间、受压部位及运动状态的不同而异;(2)人体在通常状态下,前臂、小腿及腰部等部位所需要的舒适服装压较小(490～2600Pa),但在剧烈运动时所需舒适压力要比一般状态下大1960Pa左右;(3)人体各部位都有其舒适压力范围和最大可承受的压力极限,故服装压的大小直接影响体育防护用品的运动功能及穿着舒适性.     

Study on the Prevention of Rabbit Hair from Loss

A new method is presented to solve the problem of loss of rabbit hair by using ES fiber blending with rabbit hair. ES fiber is used to bond the rabbit hair to prevent the rabbit hair from losing after heat setting. The factors affecting hair loss are heat setting temperature, rabbit hair/ES fiber blend ratio, fabric heating setting, twists of yarn, etc. Temperature of heat setting and ES fiber content are the two key factors. This method has almost no detrimental effect on the coziness of the fabric, which is better than other hair loss prevention methods.