Passport examination by polarized infrared spectra

In this study, a new nondestructive technique for passport examination is proposed. In this technique, linearly polarized light is used to measure Fourier transform infrared (FT-IR) reflectance spectra of films on the biographical data page. Thirty genuine and thirty-five counterfeit Japanese passports and five marketed films pasted on name cards were examined. The measured spectra were analyzed as follows. The absorption spectra were obtained by the Kramers-Kronig transformations of reflectance spectra. The peak ratios were then calculated from the absorption spectra by adding the peak areas at 1126 and 1263 cm(-1) and dividing the result by the peak area at 1727 cm(-1). When nonpolarized light was used, the samples could not be distinguished by comparing the peak ratios. However, when polarized light was used, they were successfully distinguished by the comparison. Therefore, polarized light is useful for the forensic discrimination of passport films by the measurement of FT-IR spectra.     

Population substructure can significantly affect reliability of a DNA-led process of identification of mass fatality victims

Aiming to evaluate the effects of population substructure on the reliability of a DNA correspondence in the process of human identification, we used the model of "in silico" constructed populations with and without substructure. Effects of population substructure were evaluated at the level of locus heterozygosity, Hardy-Weinberg equilibrium and mini-haplotype distribution. Inbreeding in a subpopulation of 100 individuals through 10 generations did not significantly alter the level of heterozygosity and Hardy-Weinberg equilibrium. However, analysis of mini-haplotype distribution revealed a significant homogenization in separated subpopulations. Average observed mini-haplotype frequency (f(o)) increased to threefold from expected values (f(e)), and the number of mini-haplotypes with f(o)/f(e) above 10 increased over sixfold, suggesting that the effects of population substructure on calculated likelihood ratios (LR) might be larger than previously estimated. In most criminal cases, this would not represent a problem, whereas for identifications in large-scale mass fatality events, population substructure might considerably increase the risk of false identification.     

Methyl 3-[3',4'-(methylenedioxy)phenyl]-2-methyl glycidate: an ecstasy precursor seized in Sydney, Australia

Five 44 gallon drums labeled as glycidyl methacrylate were seized by the Australian Customs Service and the Australian Federal Police at Port Botany, Sydney, Australia, in December 2004. Each drum contained a white, semisolid substance that was initially suspected to be 3,4-methylenedioxymethylamphetamine (MDMA). Gas chromatography-mass spectroscopy (GC/MS) analysis demonstrated that the material was neither glycidyl methacrylate nor MDMA. Because intelligence sources employed by federal agents indicated that this material was in some way connected to MDMA production, suspicion fell on the various MDMA precursor chemicals. Using a number of techniques including proton nuclear magnetic resonance spectroscopy ((1)H NMR), carbon nuclear magnetic resonance spectroscopy ((13)C NMR), GC/MS, infrared spectroscopy, and total synthesis, the unknown substance was eventually identified as methyl 3-[3',4'(methylenedioxy)phenyl]-2-methyl glycidate. The substance was also subjected to a published hydrolysis and decarboxylation procedure and gave a high yield of the MDMA precursor chemical, 3,4-methylenedioxyphenyl-2-propanone, thereby establishing this material as a "precursor to a precursor."     

猪瘟病毒的特性

本文系欧洲经济共同体委托德、法、意、比四国几个兽医工作者根据近年来全世界发表的有关猪瘟的一百多篇研究报告综合整理而成,对猪瘟的研究有一定的参考价值。翻译时略有删节。     

Giant berry aneurysms in a forensic setting: a series of 14 cases

This is a series reviewing 14 cases of giant saccular aneurysms diagnosed at the Office of the Chief Medical Examiner of New York City collected over an 11-year period. Data collected on all 14 cases included neuropathological findings, comorbidities, and toxicological findings. Of these 14 cases, 8 were in women, and the ages ranged from 3 to 79 years, with a mean and a median of 50 years. Women were overrepresented in the sixth through eighth decades. Of the 14 cases described, 11 presented with a subarachnoid hemorrhage; 3, no hemorrhage; 2, subdural hemorrhage; 8, intraventricular hemorrhage; 2, intracerebral hemorrhage; and 8, more than 1 hemorrhage type. Location of the aneurysms varied with 6 in the left side of the brain, 6 present in the right side of the brain, and 2 at the midline. We described the clinical, pathological, and toxicological findings associated with these giant aneurysms.     

The de-medicalisation of assisted dying: is a less medicalised model the way forward?

Although assisted dying has been most commonly presented within a medicalised framework, the notion of de-medicalisation is employed in this paper to suggest that there are emerging models of assisted dying in which some medical aspects assumed to be an integral part of the phenomenon are both challenged and diminished. The paper considers cases where relatives have facilitated a loved one's assisted suicide abroad, cases of assisted death in which the assistor in the actual suicide act is a non-medic, and the growing debate surrounding non-medical grounds for desiring death. In evaluating the potential impact of partial de-medicalisation on the assisted dying debate, the argument presented is that whilst a de-medicalised model could well contribute to a richer understanding of assisted dying and a better death for the person who is assisted, there are cogent reasons to retain some aspects of the medicalised model and that a completely de-medicalised model of assisted dying is unrealistic.     

PowerPlex(R) 16 HS系统直接扩增法检测常见检材的DNA

目的研究PowerPlex 16 HS系统直接扩增法对血样、口腔拭子和烟蒂3种常见检材的有效性。方法采用PowerPlex 16 HS系统对11份新鲜血样、10份口腔拭子和10份烟蒂样本进行直接扩增检测,对所得数据进行统计分析。结果新鲜血样和口腔拭子的完整遗传图谱检测成功率为100%,烟蒂样本的完整遗传图谱检测成功率为90%。结论 PowerPlex 16 HS系统直接扩增法是一种适用于血样、口腔拭子和烟蒂3种常见检材的有效方法。