不同温度下大鼠皮肤5种RNA指标与PMI的相关性

目的探讨大鼠皮肤内β-肌动蛋白(β-actin)、甘油醛-3-磷酸脱氢酶(glyceraldehyde-3-phosphate dehydrogenase,GAPDH)、18S核糖体RNA(18S ribosomal RNA,18S rRNA)、5S核糖体RNA(5S ribosomal RNA,5S rRNA)以及微小RNA-203(microRNA-203,miR-203)这5种RNA指标在不同温度下的表达水平与死亡时间(PMI)的相关性。方法将18只SD大鼠随机分为3组,处死后分别置于4℃、15℃和35℃的环境中,于死后0~120h内11个时间点取大鼠腹部皮肤。抽提皮肤总RNA,利用实时荧光定量PCR技术检测5种RNA表达水平。运用geNorm软件选取合适内参后,利用GraphPad软件对内参标准化的RNA指标进行回归分析。结果 5S rRNA和miR-203作为内参最合适。在4℃和15℃温度组中,β-actin和GAPDH的表达量变化与PMI线性关系良好。在35℃下,β-actin和GAPDH与PMI呈现S形曲线关系。而18S rRNA只在15℃和35℃温度组呈现一定的线性关系。结论皮肤组织比较适合作为提取RNA的检材,其中β-actin和GAPDH表达水平与PMI相关性良好,有望成为推测PMI的辅助指标。     

损伤皮肤中组胺荧光显微定位定量与损伤时间推断的实验研究

本文应用显微荧光分光光度计法研究大白鼠皮肤创缘组织中组胺的分布和含量,并用甲苯胺蓝法观察创缘肥大细胞形态和数量的变化。结果发现,创缘真皮乳头层出现扩散的细胞外黄色荧光和肥大细胞脱颗粒现象为生前伤的重要特点;组胺荧光分布范围及增多的程度与损伤时间密切相关。从而为损伤时间推断提供了一种新的方法。     

Comparison of injuries caused by the pistols Tokarev,Makarov and Glock 19 at firing distances of 25, 50, 75 and 100 cm

Firings in the horizontal direction at cloth targets and at human skin from autopsy material were performed using the pistols 7.62 mm Tokarev (TT), 9 mm Makarov (PM) and 9 mm × 19 mm Glock 19 with common ammunition.     

Biomechanical Factors in Human Dermal Bitemarks in a Cadaver Model*

Abstract: In bitemark analysis, the forensic odontologist must consider how the biomechanical properties of the skin contribute to distortion of the bitemark. In addition, one must consider how the bitemark can be distorted by postural movement of the victim after the bite has occurred. A fundamental review of the architecture and biomechanical properties of the dermis is described and evaluated through bites made on cadavers. In order to assess distortion, 23 bites from a single characterized dentition were made on un‐embalmed cadaver skin. Bite indentations were photographed. Following various body manipulations they were re‐photographed in different positions. Hollow volume overlays of the biting dentition were constructed, and metric analysis of the dentition and all bitemarks was completed. The overall intercanine, mesial to distal, and angle of rotation distortion was calculated. Of the 23 bites made, none were measurably identical, and in some cases, dramatic distortion was noted.     

艾司唑仑对人体神经行为能力的影响

目的研究人体血液中艾司唑仑质量浓度和神经行为能力的关系。方法采用汉化第三版计算机化神经行为测试系统(NES-C3)和人体平衡功能测试仪(SMART Equi Test誖),通过自身对照的方式,对10名服用艾司唑仑者进行神经行为能力和平衡功能测试。结果受试者神经行为能力指数和平衡功能能力指数于服药后1h开始下降,服药后3h降到最低,服药后6h部分神经行为能力得到恢复,服药后10 h神经行为能力全部恢复。结论人体血液中艾司唑仑质量浓度为20ng/mL时,可损害驾驶能力。当艾司唑仑质量浓度达到40ng/mL以上时,人体神经行为能力严重下降。相同的艾司唑仑质量浓度在吸收阶段对人体的影响大于代谢阶段。     

不同环境条件下大鼠死后皮肤大体和组织学改变

目的研究观察大鼠在不同环境条件下死后不同时间其皮肤大体、组织学的改变,为推测较长的死后间隔时间建立实验动物依据。方法观察雌性SD大鼠在不同环境条件下的死后变化,并间隔一定死后时间取皮、染色和镜下观察。结果死后发生骨、软组织分离,A组约需35d,B组需13d。皮肤有形细胞成分和附属器完全分解破坏,A组约20d,B组7d。胶原纤维在A组死后40d（B组12d）仍有部分保留完整。结论环境温度差异是造成A、B两组发生死后改变时程不同的主要因素,利用皮肤大体、组织学改变可望较系统和准确的推测晚期死亡时间。     

Immunohistochemical staining as a potential method for the identification of vaginal epithelial cells in forensic casework

There is currently no accurate method to identify vaginal epithelial cells uniquely. This study aimed to use a cell extraction procedure compatible with routine forensic sampling methods, and to investigate the expression of cytokeratin (CK), estrogen receptor-alpha (ERalpha), and phosphodiesterase 5 (PDE5) in order to distinguish between skin, buccal, vaginal, and external penile epithelial cells. Seminal fluid samples were also examined. Epithelial cell samples were fixed in formalin, embedded in agarose, and processed using histological methods. Antigen-antibody reactions were detected using the DAKO Envision+ detection system. CK was present in all cells from all five sources confirming the origin of cells as epithelial. Both ERalpha and PDE5 positively labeled vaginal, buccal, and skin epithelial cells. Although an antigen unique to vaginal epithelial cells was not identified, we have described a cell extraction procedure for use in the immunohistochemical detection of a wide range of antigens, an approach compatible with forensic diagnostics.     

电子商务犯罪的表现、原因及防范对策

随着电子商务的发展,电子商务犯罪也成为犯罪学、刑法学界关注的一个热点问题.本文主要从犯罪学角度对电子商务犯罪现象做了分析,认为电子商务犯罪在犯罪主体方面、给社会造成的危害方面及被处理方面都有自己的表现形式;电子商务交易对"安全性"的特别要求、买卖交易模式的变化、信息管理不严、金融电子化风险、税收制度滞后等构成了电子商务犯罪产生的原因;刑法手段、刑法外法律手段及其他手段构成了防范电子商务犯罪的对策.     

Engraved Suicide Notes: The Last Note Written on Body by Metallic Object

“ Suicide notes” are the notes, where the victim has documented the intention to terminate one's own life. The victim generally writes them on a paper, notebook, wall, or mirror by means of pen or marker. However, suicide notes written on one's own body are very rare, and suicide note engraved by some metallic objects over body has not yet reported. We present two cases where the victim had used some metallic objects to write a message on the body. These may be termed “engraved suicide notes.” We believe these to be the first reported cases where a metallic object was used for engraving the last notes on the body before committing suicide.     

大鼠皮肤切创愈合过程中泛素的表达及其法医学意义

目的观察大鼠皮肤切创后泛素(ubiquitin)表达的变化规律。方法应用免疫组化方法,观察大鼠皮肤切创后1、3、6、12h和1、3、6、10、14d ubiquitin的表达情况,并用图像分析系统进行图像分析。结果正常对照组大鼠皮肤有低水平ubiquitin表达,切创后ubiquitin表达增加,伤后6d达峰值,伤后10d开始下降,伤后14d恢复到正常水平。结论ubiquitin可作为法医学损伤时间推断的有效指标。