Application of three spectrometric methods to total selenium determination in postmortem material in a case of acute selenium compound poisoning

Three spectrometric methods, that is, spectrofluorimetry (SF), atomic absorption spectrometry with electrothermal atomization (ET-AAS), and atomic fluorescence spectrometry with hydride generation (HG-AFS) were used for the determination of total selenium in biological samples taken from postmortem material in a case of acute selenium compound poisoning. The precision of the SF, ET-AAS, and HG-AFS methods (RSD, n=10) was found to be in the ranges of 10.0-15.0, 3.0-6.0 and 1.0-1.5%, respectively, and the detection limit was 10.0, 4.0, and 0.1 μg/L of Se, respectively. In the case of HG-AFS, the analytical procedure takes less time and is less laborious than the other methods considered. The obtained results show the usefulness of the HG-AFS method as a supplementary analytical tool to the SF and ET-AAS methods with respect to the determination of selenium as well as the possibility of using this method as a primary one in forensic toxicology practice.     

Visualizing latent fingerprints on color-printed papers using ultraviolet fluorescence

Laser detection of latent fingerprints on a white paper has been performed, previously. Ultraviolet fluorescence from various kinds of printer toner and ink used for home printers were measured to study fluorescence imaging of fingerprints on a color-printed white paper. The experimental system consisted of a nanosecond pulsed tunable laser and a cooled CCD camera. Excitation wavelengths are 230 and 280 nm. Fourteen printers consisting of three color laser printers, three color inkjet printers, five monochrome laser printers, two monochrome copy machines, and a color copy machine were tested. Toner and ink of most printers exhibited fluorescence in the region from 360 to 550 nm. In most cases, clear fluorescence images were obtained by time-resolved imaging with a band-pass filter and 280-nm excitation. However for toners from laser color printers that showed strong fluorescence, better results were obtained with 230-nm excitation. Latent fingerprints on a photograph page and a black-character page of a newspaper were also imaged.     

微束X射线荧光光谱法检测电流损伤皮肤金属化

目的建立微束X射线荧光光谱（μ-probe X-ray fluorescence,μ-XRF）检测电流损伤皮肤金属化的方法。方法新西兰大白兔32只,随机分为黄铜电击组、紫铜电击组、铁电击组、铝合金电击组,每组8只。电极一极固定于左后腿中部,另一极固定于左前腿,建立电击模型。提取左后腿触电部位皮肤,以及对侧右后腿相应部位皮肤作为对照,应用μ-XRF光谱仪对电流损伤皮肤内金属元素进行测定。结果正常对照组皮肤中检测出磷、氯、钾、钙元素成分;在电击组皮肤中,除正常皮肤检出的元素外,黄铜电击组检测出铜、锌元素,紫铜电击组检出铜元素,铁电击组检出铁元素,铝合金电击组检出铝元素。渗透到电流损伤皮肤内的金属元素呈不均匀分布。结论μ-XRF光谱法检测皮肤金属化可作为诊断电流损伤的特征性指标,并可为触电材料的推断提供依据。     

指甲花醌显现纸张上汗潜手印初步研究

目的介绍一种用天然植物提取成分指甲花醌显现渗透性纸张表面汗潜手印的方法。方法利用指甲花醌能够和手印遗留物质中的氨基酸发生显色反应来显现手印。结果显现出的手印纹线在自然光下观察呈紫褐色,并且在540nm激发光源条件下,通过红色护目镜观察还有很强的荧光特征。结论指甲花醌显现法具有安全性高、健康环保、操作简单、显现效果明显的特点。     

应用多种STR技术对基因嵌合体进行亲权鉴定分析

目的 查找嵌合基因的来源并进行父母和孩子的亲权鉴定.方法 采用Chelex-100法抽提基因组DNA,用复合扩增和荧光检测技术对STR、X-STR和Y-STR基因座进行分型.结果 父亲为XX,XY基因嵌合体,其能够提供给孩子必须的遗传基因.结论 父亲为被检孩子的生物学父亲.     

社会主义社会矛盾运动理论的划时代创新——纪念毛泽东《关于正确处理人民内部矛盾的问题》发表五十周年

社会主义社会矛盾理论,是毛泽东哲学思想研究的重要内容。1956年,社会主义制度得以基本确立,面对一些新情况、新问题,毛泽东提出了正确处理社会主义社会矛盾的理论。毛泽东的这一理论对于我们认识与处理社会主义社会的各种矛盾提供了重大的理论及实践指导意义。但由于时代与历史的局限,这个理论也存在一些缺陷与不足。毛泽东关于社会主义社会矛盾的理论与实践为我们建设中国特色的社会主义提供了正反两个方面的历史经验。     

Visual detection of trace nitroaromatic explosive residue using photoluminescent metallole-containing polymers

The detection of trace explosives is important for forensic, military, and homeland security applications. Detection of widely used nitroaromatic explosives (trinitrotoluene [TNT], 2,4-dinitrotoluene [DNT], picric acid [PA]) was carried out using photoluminescent metallole-containing polymers. The method of detection is through the quenching of fluorescence of thin films of the polymer, prepared by spray coating organic solutions of the polymer, by the explosive analyte. Visual quenching of luminescence (lambda(em) approximately 400-510 nm) in the presence of the explosive is seen immediately upon illumination with near-UV light (lambda(ex)=360 nm). Detection limits were observed to be as low as 5 ng for TNT, 20 ng for DNT, and 5 ng for PA. In addition, experiments with normal production line explosives and their components show that this technology is also able to detect composition B, Pyrodex, and nitromethane. This method offers a convenient and sensitive method of detection of trace nitroaromatic explosive residue.     

海峡两岸专利无效制度之比较

应和着社会经济的发展,海峡两岸的专利无效制度在历史淌流中呈现出不同性态的变化。海峡两岸的专利无效制度在专利无效程序的启动、专利无效的审理、专利无效的法律效力等方面存在着共性,也有区别;各有优点,也各具不足。两岸在进行立法完善时应努力寻求两岸专利无效制度的共同点,相互借鉴,进而为两岸的科技交流与经贸合作提供有利的制度性支持。     

海峡两岸加强旅游合作探析

海峡两岸同胞连根同源、血缘相亲,相互交往的历史源远流长,加强海峡两岸旅游合作是推进祖国统一大业的需要。实现两岸直接"三通",为海峡两岸旅游合作带来新的契机,但海峡两岸旅游合作仍然面临诸多问题,必须建立两岸旅游合作机制,加大旅游产品开发力度,积极应对国际金融危机冲击,开创海峡两岸旅游合作新局面,推进海峡两岸旅游业发展。     

Buying treaties with cigarettes: Internal side‐payments in two level games

Two‐level games models predict that domestic division within a state can alter the extent to which that state is able to reach agreements with other states, and also alter the content of any agreement that is reached. I extend the model by introducing internal side‐payments composed of unrelated domestic issues. Domestic opposition to an international agreement will inhibit cooperation most when the executive and median legislators are in relative agreement about other salient domestic political issues. Domestic opposition to an international agreement will inhibit cooperation least when the executive and median legislators are in relative disagreement about other salient domestic political issues. U.S. ratifications of the NAFTA and the Chemical Weapons Convention illustrate that not all types of domestic division inhibit international cooperation—some can facilitate it