猪眼玻璃体液钾离子、次黄嘌呤浓度变化与PMI推断

目的 研究猪眼玻璃体液成分变化及其与死亡时间(postmortem interval,PMI)的关系.方法放血处死家猪后取带眼睑的眼球96只,随机分为24组,在避光、温度(15±2)℃、湿度(50±5)%条件下分别放置2～96h,采集玻璃体液,运用全自动生化检测仪、超高效液相色谱检测K+、Na+、Cl-及次黄嘌呤(hy...     

DNA定量技术在死亡时间推断中的研究进展

死亡时间推断是法医病理学研究的热点及难点之一.随着分子生物学技术的发展,DNA的定量已广泛应用于死亡时间推断的研究.本文主要对机体死后不同组织和器官中DNA含量随时间的降解情况,以及单细胞凝胶电泳、Feulgen染色图像分析技术、流式细胞仪等近年来新的DNA定量技术应用于死亡时间推断研究中的进展进行了综述.     

607例不同年份中毒尸检资料对比分析

目的研究不同年份中毒案例的毒物种类、中毒途径、中毒方式等相关问题,为此类案例的法医学鉴定提供参考。方法对华中科技大学同济医学院法医学系（湖北同济法医学司法鉴定中心）1957—2008年鉴定的607例中毒案例尸检资料进行对比分析。结果 1999—2008年218例中毒案例中死者男性居多,30～49岁占50%,中毒以口服方式为主,意外中毒居首位,毒物种类以杀鼠剂、有毒气体、农药类位居前三位。与1983—1998年及1957—1982年的中毒尸检资料对比,不同年份间毒物种类明显变化,近年农药、氰化物中毒减少,杀鼠药、有毒气体及醇类中毒增加,毒品滥用激增。结论农药中毒是长期威胁公众健康的一类毒物,须对此提高防范意识;对联合中毒日益增多的趋势应引起关注。     

大鼠死后脑、心肌和肾组织β-actin mRNA的降解与早期死亡时间的关系

目的 研究SD大鼠脑、心肌和肾组织细胞内β-actin mRNA的降解与早期死亡时间的关系,为早期死亡时间的推断寻找新的指标.方法 大鼠处死后置于20℃的环境中,分别于死后不同时间点提取脑、心肌、肾的总RNA,采用实时荧光定量RT-PCR方法检测总RNA中β-actin mRNA的水平(Ct值),分析死后经过时间与Ct...     

GC-MS检验氯胺酮制毒原料羟亚胺1例

羟亚胺（Hydroxyli mine）,化学名：1-羟基环戊基-邻氯苯基-N-甲亚胺,英文名：1-[（2-chloro-phenyl）（methyli mino）methyl]cyclopentanol,分子式：C13H16Cl NO,分子量：237。结构式见图1。常见形式为盐酸羟亚胺,纯品为乳白色或白色粉末,熔点：175℃~185℃。工业用盐酸羟亚胺为咖啡色结晶粉末状。     

Does a Draft Really Influence Postmortem Body Cooling?*

Estimation of the time of death (TOD) is a very important task of forensic pathologist, and measurement of body temperature is a method deemed to be most precise during the initial postmortem period. The study aimed at verification of the significance of airflow present in the room where a corpse is found on body cooling process and hence on determination of the TOD. The experiment was performed in pigs during which the postmortem temperature of the eye, muscles, and rectum was recorded--in still air and with generated draft in the room. The results showed that the moderate airflow present in the experimental conditions did not significantly affect the course of cooling of the investigated body sites. Despite moderate wind generated in the room, the air movement close to pigs' bodies was actually minimal. This allowed to conclude that to evaluate the TOD most precisely, one should first have reliable data on the actual velocity of air in the direct vicinity of the body rather than relying on subjective sensation of the draft and using various unnecessary corrective coefficients for TOD calculation.     

Sentencing Female Misdemeanants: An Examination of the Direct and Indirect Effects of Race/Ethnicity

Little is known about the predictors of sentencing for the typical female offender—one who commits a misdemeanor or lesser offense. Moreover, although ample discussions of racial/ethnic disparity in sentencing may be found in the extant literature, most researchers have focused on what happens to males who commit felonies. Thus, to help fill a void I examine the likelihood of receiving a jail sentence among a sample of cases for female misdemeanants. All were convicted in New York City's Criminal Court. I account for direct and indirect effects by estimating a causal model that predicts the sentencing outcome. Race/ethnicity did not directly affect sentencing. Indirect effects, however, were found. Black and Hispanic females were more likely to receive jail sentences than their White counterparts due to differences in socio‐economic status, community ties, prior record, earlier case processing, and charge severity.     

Development and validation of a simple GC-MS method for the simultaneous determination of 11 anticholinesterase pesticides in blood--clinical and forensic toxicology applications

Anticholinesterase pesticides are widely used, and as a result they are involved in numerous acute and even fatal poisonings. The aim of this study was the development, optimization, and validation of a simple, rapid, specific, and sensitive gas chromatography-mass spectrometry method for the determination of 11 anticholinesterase pesticides (aldicarb, azinphos methyl, carbofuran, chlorpyrifos, dialifos, diazinon, malathion, methamidophos, methidathion, methomyl, and terbufos) in blood. Only 500 μL of blood was used, and the recoveries after liquid-liquid extraction (toluene/chloroform, 4:1, v/v) were more than 65.6%. The calibration curves were linear (R(2) ≥ 0.996). Limit of detections and limit of quantifications were found to be between 1.00-10.0 and 3.00-30.0 μg/L, respectively. Accuracy expressed as the %E(r) was found to be between -11.0 and 7.8%. Precision expressed as the percent relative standard deviation was found to be <9.4%. The developed method can be applied for the investigation of both forensic and clinical cases of accidental or suicidal poisoning with these pesticides.     

Validation of powder X-ray diffraction following EN ISO/IEC 17025

Powder X-ray diffraction (PXRD) is used widely in forensic science laboratories with the main focus of qualitative phase identification. Little is found in literature referring to the topic of validation of PXRD in the field of forensic sciences. According to EN ISO/IEC 17025, the method has to be tested for several parameters. Trueness, specificity, and selectivity of PXRD were tested using certified reference materials or a combination thereof. All three tested parameters showed the secure performance of the method. Sample preparation errors were simulated to evaluate the robustness of the method. These errors were either easily detected by the operator or nonsignificant for phase identification. In case of the detection limit, a statistical evaluation of the signal-to-noise ratio showed that a peak criterion of three sigma is inadequate and recommendations for a more realistic peak criterion are given. Finally, the results of an international proficiency test showed the secure performance of PXRD.     

STRtyper-10F/G联合CODIS系统鉴定突变三联体和二联体

目的 评估STRtyper-10F/G、CODIS系统联合应用在突变三联体和二联体亲子鉴定中的鉴定能力.方法 104例亲子鉴定样本,采用CODIS检测,其中3例三联体发现突变的案例以及101例二联体中73例认定和28例排除案例,分别再使用STRtyper-10F/G检测;统计认定和排除情况、比较单独使用和联合使用在排除关系案例中的表现和法医学参数(H、DP、PE、PIC、TPI).结果 3例存在突变基因的三联体案例加做STRtyper-10F/G未发现更多的矛盾基因座,PI值均大于10 000,可作出认定结论;73例二联体认定案例中13例PI不足10 000,加做STRtyper-10F/G系统后PI＞10 000,可确认认定;28例排除案例最高排除率CODIS为50.00％、STRtyper-10F/G为64.29％;两个体系均具有较高的杂合度(H≥0.7)和信息量(PIC ＞0.7),联合应用CEP为0.999 999 999 505 3.结论 STRtyper-10F/G和CODIS系统联合应用可满足突变三联体和二联体亲子鉴定的需要.