DNase-I纯化结合碱性裂解法提取混合斑精子DNA

目的研究脱氧核糖核酸酶I(DNase-I)纯化结合碱性裂解法提取混合斑精子DNA的方法在法医学中的应用。方法收集79份性犯罪案件混合斑检材,分别用DNase-I纯化结合碱性裂解法和差异裂解法提取精子DNA,采用STR荧光标记复合扩增体系进行16个STR基因座分型,并比较检验结果。结果应用DNase-I纯化结合碱性裂解法提取精子DNA,64例检材分型成功;应用差异裂解法提取精子DNA,57例检材分型成功;两种方法比较结果存在显著性差异(P=0.039),DNase-1纯化结合碱性裂解法提取精子DNA的STR分型成功率更高,成本低廉。结论DNase-I纯化结合碱性裂解法提取混合斑精子DNA可提高检验成功率,操作简便,快速,易于自动化,适于法医学个体识别鉴定。     

免疫磁珠法与差异裂解法检验混合样本的效果观察

目的分析应用免疫磁珠分离技术和差异裂解法对混合样本的DNA检验效果,评价其在法医学应用中的价值。方法制备含有不同数量精细胞与阴道上皮细胞混合悬液和植绒混合斑拭子,分别采用MOSPD3抗体、SPAG8抗体免疫磁珠法及差异裂解法对样本进行检验,观察分析不同比例的混合细胞悬液,以及不同保存时间植绒混合斑拭子DNA分型的正确率。结果当混合细胞悬液内精细胞与阴道上皮细胞比例约1∶10时,免疫磁珠法的正确率明显高于差异裂解法(P0.01);当比例等于或高于1∶1时,两种方法正确率的差异无显著性意义(P0.05)。植绒拭子混合斑的免疫磁珠法正确率明显低于差异裂解法(P0.01);随混合斑保存时间的延长,差异裂解法正确率无明显下降(P0.05)。结论免疫磁珠法适用于新鲜混合样本中精细胞的分离检验,且在精细胞含量较低时优势更明显,差异裂解法较适合陈旧混合斑的分离检验。     

DNase-Ⅰ纯化结合碱性裂解法提取混合斑精子DNA

目的研究脱氧核糖核酸酶I(DNase-I)纯化结合碱性裂解法提取混合斑精子DNA的方法在法医学中的应用。方法收集79份性犯罪案件混合斑检材,分别用DNase-I纯化结合碱性裂解法和差异裂解法提取精子DNA,采用STR荧光标记复合扩增体系进行16个STR基因座分型,并比较检验结果。结果应用DNase-I纯化结合碱性裂解法提取精子DNA,64例检材分型成功;应用差异裂解法提取精子DNA,57例检材分型成功;两种方法比较结果存在显著性差异(P=0.039),DNase-1纯化结合碱性裂解法提取精子DNA的STR分型成功率更高,成本低廉。结论DNase-I纯化结合碱性裂解法提取混合斑精子DNA可提高检验成功率,操作简便,快速,易于自动化,适于法医学个体识别鉴定。     

荧光复合扩增4个Y染色体STR的单倍型及其法医学应用

目的建立一套Y染色体STR的双色荧光复合扩增系统,调查4个Y-STR基因座单倍型分布情况及其在混合斑物证检验中的法医学应用前景。方法荧光标记引物复合扩增Y-GATA-A10、DYS531、DYS557和DYS448四个Y染色体特异性STR基因座,并用ABⅠ310遗传分析仪对扩增产物进行检测、分型。结果在成都汉族120名无关男性个体中,四个基因座分别检出5、5、8、7个等位基因,共检出78种单倍型,单倍型基因多样性为0.9881。对3例本教研室不能用常规常染色体STR对男性成份作出同一认定的混合斑检材,该系统成功的作出了与嫌疑人血液Y-STR基因型一致的鉴定结论。结论建立的Y-STR荧光标记复合扩增系统具有很高的识别能力,对建立Y染色体STR数据库,研究群体遗传学和进行法医学混合斑物证鉴定有重要意义。     

混合斑的DNA分型解析

综述了常染色体STR、Amelogenin、Y染色体STR、线粒体DNA和单核苷酸多态性等DNA检测方法在解释混合斑检验结果应用中的进展。对混合斑的统计学方法也作了总结。     

Differex~（TM）与Chelex-100法在混合斑检验中的应用比较

目的探讨DifferexTM系统法在法医学性侵犯案件混合斑检验中的应用价值,并与传统Chelex-100法进行比较。方法对日常性侵犯案件中的生物检材分别通过DifferexTM系统法与Chelex-100法检验来比较两种方法的优劣。结果采用Chelex-100法提取时,在所检验样本中仅有床单全部获得单一分型,而采用DifferexTM系统法则只有一条内裤的分型为混合型,其它均为单一分型。应用DifferexTM系统法还可以同时提取女性上皮细胞DNA,成功率为100%。采用Chelex-100法时出现双尖峰的频率也明显超过DifferexTM系统法。结论 DifferexTM系统法在法医学性侵犯案件混合斑检验中比Chelex-100法具有更明显的优势,是一种非常有应用前景的方法。     

DNA IQ^TM系统在混合斑精子DNA检验中的应用

笔者在强奸案件混合斑精子的DNA检验中,以差异裂解法第一步消化去除女性细胞得到精子沉淀后,采用DNA IQTM系统直接提取混合斑中精子DNA,在200余份检材的检验中获得较满意结果。现将方法报告如下:1材料与方法1.1材料取自本实验室日常检案积累的混合斑样本216份。主要仪器和试剂采用9700PCR扩增仪(美国ABI公司)、ABI3100型遗传分析仪(美国ABI公司)、DNA IQTM系统(Promega公司)、AmpF1STRIdentifiler试剂盒((美国ABI公司)。1.2方法1.2.1 DNA提取参照差异裂解法,经过套管离心去除女性细胞后,得到沉淀精子,加入100~200ulDNA …     

限制性组合分析法推定男女混合斑中个体分型初探

正混合斑是指包含两名或两名以上个体的混合生物检材,在多数情况下,此类检材的DNA分型往往表现为两人或多人的混合分型,使结果分析较为复杂[1]。本文尝试采用2005年国际法医遗传学会(ISFG)推荐的关于混合斑结果分析中的计算方法对混合斑案件中单一个体DNA分型结果进行分析。1材料与方法1.1样本及检验样本由公安部物证鉴定中心提供强奸案件中床单上混合斑检材1份,为日常检案积累,根据案情调查证实该检材系混合斑。DNA检验采用Chelex法提取上述检材DNA,经DNATyperTM15 plus试剂盒扩增后在ABI 3130遗     

改良差异裂解法结合硅珠法提取混合斑精子DNA

目的采用改良差异裂解法结合硅珠法提取混合斑中精子DNA,并评价其应用价值。方法收集52例经常规差异裂解法检验含有女性分型的混合斑检材,采用改良差异裂解法结合硅珠法提取精子细胞DNA,IdentifilerTM试剂盒进行PCR扩增检验。并将常规差异裂解法结果作为对照。结果52例混合斑检材中,采用改良差异裂解法结合硅珠法检出单一男性精子成分有38例,男性分型检出率达到98．08％。结论改良差异裂解法结合硅珠法适合提取混合斑中精子DNA。     

混合斑中酸性磷酸酶及精子检出时限的研究

目的 研究探讨性生活后活体阴道内混合斑中酸性磷酸酶（ ACP）及精子的检出时限。方法 采用取材、检验三盲法对 600例阴道拭子进行 ACP及精子的常规检验。结果 ACP最长检出时限 255h,平均检出时限 52h。精子最长检出时限 132h,精子平均检出时限 29h。 ACP检出例中阳性程度在（＋＋）以上占 41.3％,精子检出例中阳性程度为每个视野 6～ 10个占 34.3％。 结论 应用混合斑中酸性磷酸酶及精子的检出时限 ,能为侦审性犯罪案件的法医学鉴定提供客观依据。     

Investigation of homicides interred in concrete--the Los Angeles experience

Decedents interred in concrete present unique problems and investigation of these deaths necessitates a team of forensic specialists. The Los Angeles County Department of Coroner has had five such deaths in the past 18 years. The buried cases needed layer-by-layer excavation to establish the time and cause of death. Metal detectors are often used in this process. X-rays of the interred remains were completed to help with locating the decedent's position in the concrete. The breaking of concrete in some of the cases required the use of a sledgehammer and later a chisel in a manner that would not damage the remains. Postmortem dismemberment was frequent in our cases. The decedents were all female or prepubescent children, and the perpetrators were closely related to the decedents. While concrete can interfere with determination of postmortem interval, it can also preserve the remains and assist with identification.     

Forensic Approach to an Archaeological Casework of “Vampire” Skeletal Remains in Venice: Odontological and Anthropological Prospectus*

Abstract: During the years 2006–2007, the Archeological Superintendent of Veneto (Italy) promoted a research project on mass graves located on Nuovo Lazzaretto in Venice, where the corpses of plague deaths were buried during the 16th and 17th centuries. The burials were of different stages and are believed to be the remains of plague victims from the numerous outbreaks of pestilence, which occurred between the 15th and 17th centuries. Among the fragmented and commingled human bones, an unusual burial was found. The body was laid supine, with the top half of the thorax intact, arms parallel to the rachis axis, the articulations were anatomically unaltered. Both the skull morphology and the dimensions of the caput omeris suggest the body was a woman. A brick of moderate size was found inside the oral cavity, keeping the mandible wide open. The data collected by the anthropologist were used to generate a taphonomic profile, which precluded the positioning of the brick being accidental. Likewise, the probability of the brick having come from the surrounding burial sediment was rejected, as the only other inclusions found were bone fragments from previous burials in the same area. The data collected by the odontologist were employed for age estimation and radiological dental assessment. The forensic profile was based conceptually on the “circumstances of death” and concluded that the positioning of the brick was intentional, and attributed to a symbolic burial ritual. This ritual confirms the intimate belief held at those times, between the plague and the mythological character of the vampire.     

Forensic Analysis of a Contact Lens in a Murder Case

Contact lenses have had rare relevance in trials and/or investigations. After 5 years of burial, orbital remnants were retrieved from an exhumed body and subsequently identified as a key piece of material evidence in a murder trial. The exhumed case materials were evaluated under laboratory conditions and were determined to be contact lens remnants. Contact lens fracture and burial simulation studies were performed to provide additional corroboration of the physical findings of the exhumed contact lens remnants. This material evidence was instrumental in providing factual proof refuting the defendant's testimony in the murder trial. A brief history of contact lens composition and use is provided for understanding the methods and observational results. This forensic case study represents the first published documentation of a contact lens from an exhumed body being used in a murder investigation and establishes an operational procedure for future forensic contact lens examinations.     

毒物代谢动力学研究在法庭科学中的应用

随着法庭科学的发展以及近年来涉及毒品、毒物等中毒案件的增加,许多研究者对毒物代谢动力学进行研究,并取得了一定的成果.本文综述毒物代谢动力学研究及其在法庭科学中的应用状况,概要介绍毒物代谢动力学的研究现状、研究方法及研究成果,以期为相关研究及实践提供参考和借鉴.     

Comparison Among Manual Facial Approximations Conducted by Two Methodological Approaches of Face Prediction

This study verified the difference between two methods of forensic facial approximation (FFA) regarding recognition and resemblance rates. Three‐dimensional models of skulls were obtained from computerized tomography (CT) scans of two subjects (targets). Two manual FFAs were performed for each target, by applying two different guidelines for the facial structures (what we called “American method” (AM) and “Combined method” (CM)). Unfamiliar assessors evaluated the sculptures by recognition and resemblance tests. The AM was that which allowed more correct responses of recognition and higher resemblance's scores for the male target (p < 0.001). Regarding guidelines for modeling characteristics of the face, the ones that are practical and easily performed for sculptures, such as the length of the anterior nasal spine multiplied by 3 for nose prediction, may offer better results in terms of resemblance.     

Antemortem and Postmortem Nonapposite Data—A Multidisciplinary Identification Strategy

Identification of human remains is often achieved by comparing documented reference data with the same type of evidence obtained from the remains. We present a case of a decomposed unidentified body, whose identity was presumed but because of the low validity range of the available data, the identification process could not be completed. Antemortem radiographs of the teeth found in the house of the reputed victim could not be compared to the edentulous cadaver and the kinship between the victim and the only living relative that could provide DNA for comparison was too tenuous. Isolated teeth found at the scene, were neither a source of DNA reference information nor questioned data to be compared to the antemortem radiographs. The strategy implemented by the investigators to reallocate the status of the isolated teeth from the questioned source to the reference source of DNA to be compared with the cadaver is presented.     

Creating a State‐Academic Partnership to Advance a Forensic Teaching Service: Benefits and Barriers

In Washington State, like many states, there is a shortage of forensically trained mental health clinicians to work with criminal justice‐involved individuals. At the direction of the state legislature, a collaborative project was undertaken by the University of Washington, the state Department of Social and Health Services, and a state psychiatric hospital to develop a proposal for a jointly sponsored forensic teaching service. The authors reviewed the literature, surveyed and interviewed forensic psychiatry and psychology training directors, and conducted site visits of selected training programs that offer multidisciplinary training or have affiliations with state hospitals. The authors conducted focus groups of additional stakeholders, including clinicians and patients in forensic settings, to better understand the needs in Washington. The authors report on several common benefits and barriers to establishing forensic teaching services. Other states and forensic programs may find this article useful in identifying common considerations for forensic mental health teaching services.     

刑事强制鉴定制度初探

近年来,随着刑事要案为公众所广泛关注,在某些案件中,司法鉴定成为直接影响被告人刑事责任的重要手段,也被推至舆论的风口浪尖之上。然而学界却少有对强制鉴定构建模式的专门论证。我国应当在法律中规定当事人的鉴定请求权,构建与裁量鉴定并行的强制鉴定制度,确定其适用条件、具体程序及监督体制。     

利用腭皱特征进行同一认定的指标体系构建

目的根据腭皱的形态图特征,进行口腔腭皱在法医学同一认定的指标体系构建。方法收集100例成年人腭皱模型,依据腭皱的形状、数量、位置分布等特征对腭皱形态图进行全面系统的编码。编码顺序采用英文字母按照先右侧再左侧,先前部再后部的顺序编码,并且右、左侧编码以破折号连接。最后依据编码,统计分析腭皱形态分布特征。结果 100例腭皱形态图中,个体间未见完全一致者,每个个体不论男性与女性均表现有独特的腭皱形态图;且同一个体左右侧单条腭皱的形态及分布亦不同。波浪形腭皱所占比例最大（23.03%）,三分叉形出现比例最小（0.74%）,不同性别的波浪形及曲线形腭皱所占比例均较大,女性波浪形（22.7%）及曲线形（18.28%）;男性波浪形（24.11%）及曲线形（21.43%）。结论口腔腭皱法医学同一认定的指标体系构建,将为法医学的同一认定提供一种新的方法。     

道路交通事故法医检验技术的研究进展

近年来,经济快速发展和机动车数量急剧增多,道路交通事故频发和伤亡人数不断上升已经成为备受关注的全球性问题。法医检验作为交通事故处理中重要的证据,其鉴定意见直接影响着当事方的权益和事故处理。不容置疑,法医检验技术的运用对鉴定意见有十分重要的影响作用。本文对国内外法医检验技术的最新研究进展和应用进行综述,供同行实践工作中参考。