Hair as a specimen to document tetramethylene disulfotetramine exposure

Tetramethylene disulfotetramine (tetramine) is a rodenticide that has been banned for many years in China. Since 2005, inhabitants of a village in the Henan Province have been suffering from grand mal seizures. To investigate the possibility of tetramine as the cause, we developed a method to determine tetramine in human hair. Sample preparation involved external decontamination, frozen pulverization, and ultrasonication in 2 mL ethyl acetate in the presence of cocaine-d3 as an internal standard. The method exhibited good linearity; calibration curve was linear over a range of 0.1-20 ng/mg hair. The limit of detection for the assay was 0.05 ng/mg hair. Except for one subject (No. 4), all head and pubic hair samples were positive for tetramine. The concentrations of tetramine in pubic hair were significantly higher than those in the same subjects' head hair samples. Because of a long retention in body, segmental head hair analysis cannot provide an accurate exposure history of tetramine in the body.     

GC/ECD检验生物检材中的氟乙酸钠

建立对生物检材中氟乙酸钠的GC/ECD检验方法。用PFBBr作衍生化试剂,对氟乙酸钠或氟乙酰胺中毒后脏器中的氯乙酸（氯乙酸钠）进行衍生化,GC/ECD和GC／MS的分析。在1ml血中添加lμg1080,其回收率为76．2％,RSD为3．07（n＝7）;在1g肝中添加2μg的1080其回收率为84．4％,RSD为1．87（n=5）。研究的方法经动物试验和大量中毒案件的验证,效果较好。该方法已在中毒案件的检验中广泛应用。     

《鹿特丹规则》下无单放货解决机制：从凭保函放货到凭指示放货

《鹿特丹规则》对无单放货问题设计了新的解决机制，通过使特定条件下的无单放货合法化，试图减轻承运人的负担，平衡船货双方的利益。采取规范分析的方法，对这一机制进行解构，论述其给各当事方的法律地位所带来的变化，认为对现有制度进行改良可能是更好的选择。     

自制海洛因标准品在常用有机溶剂中稳定性研究

目的 研发海洛因标准品及优化分析方法,以对云南缴获海洛因样本提纯制备成的自制海洛因对照品在常用有机溶剂中的稳定性进一步研究.方法 采用内标及GC、GC/MS方法,通过对提纯制备的海洛因在5种有机溶剂中冷藏保存后含量的变化,观察海洛因在常用有机溶剂中的稳定性.结果 乙醇、三氯甲烷及乙腈为溶剂的自制海洛因对照品储备液,保存30天时间范围内海洛因含量未发生明显变化;以丙酮作为溶剂的自制海洛因对照品储备液,在7至30天时间范围内,海洛因含量明显升高;以甲醇作为溶剂的自制海洛因对照品储备液,在0小时至30天时间范围内,海洛因含量一直呈明显的下降趋势.结论 乙醇、三氯甲烷及乙腈可以作为海洛因样品储备液溶剂使用,丙酮、甲醇不适合作为海洛因样品储备液溶剂使用.     

中毒死者体内毒鼠强的GC/MS-SIM分析

一 1 9岁男子赌气吞服一白色粉末 ,1 0min后口鼻流血、抽搐 ,迅速送医院 ,经催吐、透析等方法治疗 5天后死亡。根据中毒症状和经验怀疑为毒鼠强中毒。用GC/NPD检验肝中毒鼠强有干扰。改用GC/MS -SIM法分析 ,心血、肝和胃组织中全部检出毒鼠强 ,浓度分别为 0 5 1 μg .mL- 1、0 4 5 μg .g- 1和 0 33μg .g- 1,和文献结果在同一水平。GC/MS -SIM对复杂检材中低含量毒鼠强测定具有更高的选择性 ,也具有较高的灵敏度 ,同时进一步证实毒鼠强排泄较慢 ,经过较长时间后在体内分布比较均匀     

微软项目管理软件的二次开发

大型项目的管理与实施工作是一项十分复杂而重要的学科。随着计算机科学的迅猛发展，在过去十年中越来越多地涌现出能够有效提高工作效率的软件工具。微软的 MS project软件就是其中较好的一种。我们在实际工作中运用该软件取得了一些十分有益的经验。     

Deconstructing the myth of the Tatar Yoke

Analysing and comparing the various conventional and revisionist narratives on what is known as the ‘Tatar Yoke’, this article aims to show that Western historiography has long been critical of the dominant negative view on the Tatar–Mongol rule over Russian principalities and that in Russia we find similar revisions in history – with some exceptions – only in post-Soviet times. This article aims to demonstrate how the revisionist views on the Tatar–Mongol rule contributed to the political and cultural transformation of contemporary Russia. In the part which analyses the revisionist discourse in Russia the emphasis lies on the new Tatar narrative. For Tatars the new interpretation of the Tatar–Mongol rule is of outstanding importance because it functions as a means to enhance Tatar national pride, and it contributes to Tatarstan's sovereignty project.     

Economic Reform and Social Change in China: Past, Present, and Future of the Economic State

China's socioeconomic crisis before 1978 and its success over the past two decades can be viewed as a zigzag process of politicization and depoliticization of the economic state. By summarizing the Chinese experience, this article shows the importance of a specific pattern of general public policy (GPP) in determining the nature of a policy system. China's economic and serialized reforms since 1978 are reviewed in order to illuminate the current situation and future direction of the nation. The changes have undermined the economic state by creating a trend of de-economicization in the Chinese government. If economic reform and social change are to continue smoothly, another transfer of state emphasis to more balanced development is required.     

英语教学与研究性学习的思考

研究性学习是适应E时代社会发展而出现的一种新型的教育理念,是自20世纪80年代末以来国际教育界比较普遍推崇和实施的一种培养“关键能力”的重大教育改革。根据笔者教学实践和研究,本文拟对研究性学习发表几点浅见。