利用红外显微镜无损检测圆珠笔油墨色痕的研究

在这个研究中,红外显微镜聚焦功能得到了充分验证。该研究采用的检测方法是通过红外显微镜将红外光斑直接聚焦在样品表面,采集其红外光谱。根据样品红外吸收峰的个数、位置、强度及形状进行定性分析,以达到区分相同颜色不同品牌的圆珠笔油墨色痕的研究目的。研究结果表明,采用的检测方法可有效区分相同颜色不同品牌的圆珠笔油墨色痕。而且该检测方法具有无损检测特点,保持了物证的原样性。     

The Influence of Sexual Orientation on Health Behaviors in Women

SUMMARY

Lesbians may be at risk for poorer health outcomes than heterosexual women because of differential health behaviors and risk factors for disease. Difficulty recruiting representative lesbian populations and a lack of simple, accurate measures of sexual orientation have hindered research about the differential health risks and outcomes faced by lesbian and heterosexual women. The purpose of this article was to (1) examine the relationship between self-chosen sexual orientation labels and other sexual orientation measures and (2) compare the health related behaviors of women of diverse sexual orientations based on simple sexual orientation measures. The participants in this study were women aged 18 to 74 recruited via public announcements in mainstream and minority communities to participate in a randomized trial of breast cancer risk counseling strategies. Sexual orientation, relevant health behaviors and other outcomes related to breast cancer risk and screening were measured. No single measure of sexual behavior or desire appears to accurately measure lesbian sexual orientation. Lesbians were found to participate in mammography and Pap testing at significantly lower levels than bisexuals and heterosexuals. These data add to the growing body of knowledge on lesbian health and point to areas of community action and future research.     

Analysis of the Effects and Relationship of Perceived Handwritten Signature's Size,Graphical Complexity,and Legibility with Dynamic Parameters for Forged and Genuine Samples

This article presents an analysis of handwritten signature dynamics belonging to two authentication groups, namely genuine and forged signature samples. Genuine signatures are initially classified based on their relative size, graphical complexity, and legibility as perceived by human examiners. A pool of dynamic features is then extracted for each signature sample in the two groups. A two‐way analysis of variance (ANOVA) is carried out to investigate the effects and the relationship between the perceived classifications and the authentication groups. Homogeneity of variance was ensured through Bartlett's test prior to ANOVA testing. The results demonstrated that among all the investigated dynamic features, pen pressure is the most distinctive which is significantly different for the two authentication groups as well as for the different perceived classifications. In addition, all the relationships investigated, namely authenticity group versus size, graphical complexity, and legibility, were found to be positive for pen pressure.     

海南汉族人群19个STR基因座遗传多态性及其应用

目的建立海南地区汉族人群19个常染色体STR基因座的遗传多态性数据资料,并探讨此19-STR基因座系统在亲子鉴定中的应用。方法对海南汉族462例无血缘关系个体,采用Goldeneye~(TM) 20A系统复合扩增并检测,得到19个STR基因座的遗传数据信息;在283例亲子鉴定案例中,评价19-STR基因座系统的应用。结果 19个STR基因座的基因频率分布均符合Hardy-Weinberg平衡(P0.05),杂合度在0.603~0.914之间,累积个体识别率大于0.999 999 999 999 999,累积三联体非父排除率为0.999 999 994。283例亲子鉴定中,三联体170例,二联体113例;认定案例247例(87.3%),排除案例36例(12.7%);发生等位基因突变案例14例(4.9%),均为一步突变。结论 19个STR基因座中的14个基因座具有高度遗传多态性,19-STR基因座复合扩增分型系统具有较高的非父排除效能,可满足海南地区亲子鉴定的需要,同时应注意亲子鉴定中的基因突变现象。     

河南汉族群体20个常用STR基因座突变分析

目的观察20个常染色体STR基因座突变在河南汉族人群中的分布情况。方法从3011例确认亲子关系的亲子鉴定案例中筛查基因突变事件,确定突变来源,统计各STR基因座的突变率,分析突变规律并与部分不同地区的人群STR基因座突变情况进行比较分析。结果在20个STR基因座中观察到19个基因座的发生的76次突变事件,平均突变率为0.08%累计突变率达到1.662 9%;父、母源性突变的比率大致为8:1;河南汉族人群在Penta E和D12S391基因座突变率明显低于北方汉族人群(P0.05);在D6S1043、CSF1PO和D12S391基因座突变率明显低于广东人群(P0.05);在CSF1PO基因座突变率明显低于云南汉族人群(P0.05)。结论 STR基因座突变现象较为常见,不同基因座的突变率存在着明显的地区差异。     

Defending the scientific foundations of the firearms and tool mark identification discipline: responding to recent challenges

Recent challenges have brought the discipline of firearms and tool mark identification to the forefront in recent court cases. This article reviews those challenges and offers substantial support for the scientific foundations of the firearms and tool mark identification discipline. A careful review of the available literature has revealed that firearms and tool mark identification is rooted in firm scientific foundations, critically studied according to the precepts of the scientific method culminating in the Association of Firearms and Toolmark Examiners' Theory of Identification. Firearms and tool mark identification has been validated in a manner appropriate for evidence of the kind to be expected in firearms and tool mark examinations. Proficiency tests and error rates have been studied and can provide consumers of the disciple with a useful guide as to the frequency with which misidentifications are reported in the community using appropriate methodologies and controls. As a result, the primary issues in recent challenges do not invalidate the firearms and tool mark discipline as a science nor should it detract it from its admissibility in a court of law.     

Simulation for Theory Testing and Experimentation: An Example Using Routine Activity Theory and Street Robbery

Achieving a better understanding of the crime event in its spatio-temporal context is an important research area in criminology with major implications for improving policy and developing effective crime prevention strategies. However, significant barriers related to data and methods exist for conducting this type of research. The research requires micro-level data about individual behavior that is difficult to obtain and methods capable of modeling the dynamic, spatio-temporal interaction of offenders, victims, and potential guardians at the micro level. This paper presents simulation modeling as a method for addressing these challenges. Specifically, agent-based modeling, when integrated with geographic information systems, offers the ability to model individual behavior within a real environment. The method is demonstrated by operationalizing and testing routine activity theory as it applies to the crime of street robbery. Model results indicate strong support for the basic premise of routine activity theory; as time spent away from home increases, crime will increase. The strength of the method is in providing a research platform for translating theory into models that can be discussed, shared, tested and enhanced with the goal of building scientific knowledge.

Differences in the Validity of Self-Reported Drug Use Across Five Factors: Gender,Race, Age,Type of Drug,and Offense Seriousness

This study expands our knowledge about the validity of self-reported drug use by examining how gender, race, age, type of drug, and offense seriousness interact to affect the validity of self-reported drug use. This study also provides a conceptual framework that can be used to examine the validity of self-reported drug use. Differences in the validity of self-reported drug use are explained by examining differences in underreporting and overreporting. Differences in underreporting and overreporting are then further examined while controlling for differences in base rates of drug use. As shown, whether one controls for base rates of use may drastically affect estimates of underreporting and overreporting. By using hierarchical loglinear, logit, and logistic regression models with the Drug Use Forecasting data, we show that Black offenders provide less accurate self-reports than White offenders. Black offenders do so because they are more likely to underreport crack/cocaine use than White offenders. This difference, however, disappears once differences in base rates are controlled. A Black offender who tests positive is not more likely to underreport crack/cocaine use than a White offender who tests positive. Black offenders are also more likely to overreport both marijuana and crack/cocaine use relative to White offenders. Contrary to the first, this difference is not attributable to a difference in base rates. Methodological and substantive implications of this distinction are discussed. No differences across gender, age, or offense seriousness were found.

InDel_typer30:用于中国5个主要民族DNA鉴定的多重PCR系统

目的采用插入/缺失(Insertion/Deletion,InDel)多态性遗传标记,建立一种可用于中国汉族、回族、维吾尔族、蒙古族、藏族5个主要民族法医DNA鉴定的多重PCR系统。方法采用人类基因组浏览器和dbSNP数据库筛选具有高度遗传多态性的人类常染色体InDel标记,采用Primer 3软件设计多重PCR引物,通过复合荧光标记系统建立多重PCR扩增体系,采用该体系对汉、回、维、蒙、藏5个民族进行多态性调查。结果成功建立了一个包含30个InDel位点和Amelogenin性别鉴定位点的复合荧光多重PCR扩增体系,命名为InDel_typer30。多态性调查显示这30个InDel位点在上述5个主要民族中均呈高度遗传多态性,平均期望杂合度分别为:0.464、0.460、0.453、0.466和0.469,平均个人识别率分别为:0.595、0.585、0.586、0.589和0.595。该系统在5个民族中的累积个人识别率(CDP)均达到0.999999999996以上。结论 InDel_typer30是一种适用于中国汉、回、维、蒙、藏5个主要民族的法医DNA鉴定系统。     

Results of the 2009 Paternity Testing Workshop of the English Speaking Working Group of the International Society for Forensic Genetics

Here we present the results of the 2009 Paternity Testing Workshop of the English Speaking Working Group of the International Society for Forensic Genetics. The exercise included paternity testing of blood samples from a mother, a child and two alleged fathers. The laboratories were encouraged to answer questions concerning their laboratory routines and a paper challenge was distributed in order to compare statistical calculations. A total of 62 laboratories participated. The laboratories used a total of 49 autosomal STRs and PCR-investigated VNTRs, 19 Y-chromosomal STRs, 8 X-chromosomal STRs, 7 VNTR systems investigated with RFLP, 49 autosomal SNPs and 11 mtDNA SNPs. The rate of typing and reporting errors was 0.1%.