On the Complexity and Accuracy of Geographic Profiling Strategies

Geographic profilers have access to a repertoire of strategies for predicting a serial offenders home location. These strategies range in complexity—some involve more calculations to implement than others—and the assumption often made is that more complex strategies will outperform simpler strategies. In the present study, we tested the relationship between the complexity and accuracy of 11 strategies. Data were crime site and home locations of 16 UK residential burglars who had committed 10 or more crimes each. The results indicated that strategy complexity was not positively related to accuracy. This was also found to be the case across tasks that ranged in complexity (where complexity was determined by the number of crimes used to make a prediction). Implications for police policies and procedures, as well as our understanding of human decision-making, are discussed.To whom correspondence should be addressed. Phone: +1-709-737-3101; E-mail: bsnook@play.psych.mun.ca     

OTS-2．2S基因芯片对人脑挫伤后基因表达差异的初步研究

目的利用基因芯片技术,研究人挫伤脑组织中基因表达差异。方法从脑组织提取mRNA,通过OTS-2.2S基因芯片,研究脑挫伤组织与对照脑组织细胞原癌及抑癌相关基因特异性表达差异。结果发现在挫伤脑组织中,HoJ-1和KIAAOO65基因表达水平显著下降,而p107mRNA表达水平显著升高。结论在脑挫伤中仅发现3条基因的表达有显著性差异;本研究是对脑损伤后基因表达水平及其法医学意义进行的探索性研究。     

Use of a Spray Device to Locate Touch DNA on Casework Samples

The use of a fluorescent dye to visualize cellular material on surfaces offers a targeted sampling approach for locating touch DNA on casework items. However, the current application of such dye is not feasible for examination of relatively large items. As a result, development of an efficient dye application system is required to translate this approach into practice. Here, the spray pattern (area covered, intensity, and evenness) of 15 different commercial spray devices was examined visually using food coloring. From this, five devices were selected to apply Diamond Nucleic Acid Dye (DD) to three substrates (glass slide, plastic sheet, and brown packing tape) seeded with saliva and touch DNA. The cellular material was visualized using the Dino-lite Microscope and Polilight. The inhibitory effects of DD afforded by each spray device were examined using Identifiler Plus^® DNA profiling kit and a DNA input of 800 pg. The two most promising devices were further tested on a range of mock casework items seeded with touch DNA. The results presented demonstrate the feasibility of a spray system to apply DD to large surfaces and subsequently detect cellular material at both micro and macroscale. Specifically, the data suggest that a pressurized continuous-spray system is favorable and that droplet size influences the intensity of fluorescence and surface coverage. Furthermore, this study indicates that full STR profiles can be obtained following spraying with DD solution, even with excessive application, which is essential for the widespread use of these devices in casework.     

论如何加强民营小型化工企业的消防安全

化工企业生产规模不断扩大,生产中所涉及的物质中可燃有机物所占的份额不断增大,而且生产本身又具有生产方法多种多样、装置规模大型化和生产工艺高参数的特点,这些因素决定了化工企业具有较大的火灾危险性。本文针对化工企业火灾的特点、成因,对化工企业火灾防治进行了研究,分析了化工企业中存在的火灾危险及薄弱环节,结合实际情况提出了相应的预防措施。结果表明有效的火灾预防措施能最大限度地减少发生火灾爆炸事故的机率。因此,及时有效地对化工企业中存在的潜在危险做好预防措施是十分必要的。     

A case of tri-allelic pattern at locus D3S1358 on chromosome 3p21 inherited from paternal grandmother

We are reporting a case of tri-allelic inheritance at locus D3S1358 commonly used for genetic identification in forensic DNA testing. This case was encountered during routine paternity testing using commercial DNA profiling kits. The tri-allelic inheritance identified was probably a result of duplication at this locus, supported by the equal peak intensities and inheritance pattern from grandparent to child.     

东亚区域经济合作中的云南易制毒特殊化学物品管理模式探析

随着东亚区域经济合作步伐的加快,控制与阻断易制毒特殊化学物品的非法流通,在遏制境外毒品犯罪的祸源上寻求最新管理模式显得十分紧迫与必要。1、管理应由传统的“垂直型”向“扁平化”和“网络化”发展;2、应由单一的“自拉自唱”向“战略联盟”管理模式转变;3、应由单一型知识结构向“复合型”的人才升级转变。     

Evaluation of Commercial Kits for Dual Extraction of DNA and RNA from Human Body Fluids, ,

STR typing of DNA evidence can identify the donor with a high power of discrimination but cannot identify the tissue origin of a body‐fluid stain. Using RNA to attribute a crime scene stain to a particular tissue may aid in reconstruction efforts. With blood from 10 donors, four DNA and RNA coextraction kits were evaluated by measuring yields and STR and mRNA profiles. T tests indicated some significant differences in kit performance. The Zymo Research ZR‐Duet^? kit performed best based on average DNA (41.4 ng) and mRNA (4.07 ng) yields and was the only kit to provide complete DNA/RNA profiles for all samples. The consistency of this kit was challenged by data from additional blood and saliva donors. Further testing is advised before a superior kit is unequivocally chosen. Stand‐alone DNA or RNA purification generally offers higher yield, but coextraction may still allow successful STR profiling and tissue source identification.     

The Measurement of Stable Carbon Isotope Ratios of Eight Methamidophos Samples

Between December 2007 and January 2008, people suffered from food poisoning in the Japanese prefectures of Chiba and Hyogo after eating frozen dumplings (gyoza) produced in China, which had very high concentrations (1490–19,290 ppm) of methamidophos (O,S‐dimethyl phosphoramidothioate). Thus, we measured the stable carbon isotope ratio of methamidophos using GC/C/IRMS to identify the source. We analyzed seven methamidophos reagents and one Chinese agricultural methamidophos chemical (MTD600) that contained many impurities. The δ¹³C values of the seven methamidophos reagents and MTD600 ranged from ?49.23‰ to ?31.90‰, with an average SD of 0.20‰, very high precision. This difference (17.33‰) was very large compared with that in previous reports and may be attributable to the material itself and the chemical processing of methamidophos. Criminals can easily obtain pesticides such as methamidophos; therefore, it is very important to identify the pesticide source and distribution route using stable isotopic science in the future.     

高速公路化危品槽车突发事故救援对策初探

近年来，随着我国高速公路的不断延伸，参与高速公路化危品槽车突发事故的抢险救援工作已成为各级消防部队面临的一个新课题，本文从分析掌握高速公路化危品槽车突发事故的特点等5个方面入手，就应采取的抢险救援对策进行了深入探讨。     

犯罪心理画像历史发展评析

过去数十年里,犯罪心理画像(criminalprofiling)在国外的一些国家得到长足的发展,日显成熟,逐步成为侦查实践中不可或缺的一项侦查技术和法庭科学,而我国在这方面的研究甚少。本文通过查阅和编译国内外相关资料,从历史的角度重点论述犯罪心理画像的研究对象、在侦查中的运用、分类方法和发展历史,以期为加强犯罪心理画像在我国的本土化研究提供理论参考。