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171.
本文经实验研究,确定了在酸性条件下用氯仿作为萃取剂,萃取液经酸性氧化铝柱净化,分段收集冼脱液的方法,使杀鼠迷回收率在不低于70%的基础上,脂肪及其它杂质近乎完全清除。杀鼠迷的检测采用高效液相色谱法(HPLC),紫外检测灵敏度达10~(-9)g。并对杀鼠迷中毒家兔的尿液进行了分析,发现一次性服用20mg/kg 体重的家兔,在45h 的尿液中,尚能检出其原形物。 相似文献
172.
浅谈查缉战术模拟实战训练的组织与实施 总被引:1,自引:1,他引:0
模拟实战训练在查缉战术教学中起着至关重要的作用,在组织模拟实战训练时要制定好计划,在实施时,注意安全,还要积极开展教学总结。 相似文献
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影响allo-HSCT受者DNA嵌合率的因素有很多:如受者的疾病类型、移植前预处理方案、移植时病情的严重程度、造血干细胞来源、局部的GVHD、HLA是否相合等。本文主要讨论与法医学关系最为密切的2个影响因素,即移植后时间和检测方法的灵敏度。法医物证学工作者在检案实践中,对allo-HSCT受者进行亲权鉴定或个体识别时,需注意移植后时间和检测方法的灵敏度对嵌合率的影响。女性受者接受男性供者HSCT的情况下,受者毛囊中可以检出供者Y染色体DNA,检案实践中来源于犯罪现场的生物检材不能仅仅检测Y染色体特异遗传标记,以免导致错误判断。 相似文献
177.
Instantaneous first impressions of facial trustworthiness influence the manner in which observers evaluate ensuing information about stranger targets [e.g. Porter, S., &; ten Brinke, L. (2009). Dangerous decisions: A theoretical framework for understanding how judges assess credibility in the courtroom. Legal and Criminological Psychology, 14, 119–134. doi:10.1348/135532508X281520]. In two studies, we examined the association between perceptions of general trustworthiness and honesty assessments in an extremely high-stakes sample – individuals publicly pleading for the return of a missing relative, half of whom had killed the missing individual. In Study 1, observers (N?=?131) provided trustworthiness ratings – either before or after viewing and evaluating the honesty of videotaped or audio-only pleas – for a still image that depicted a neutral expression on the face of each pleader. In Study 2, observers (N?=?220) evaluated the sincerity of audio pleas paired either with an untrustworthy-looking target, a trustworthy-looking target, or no target face. Collectively, our findings indicated that first impressions of trait trustworthiness form the basis of state judgments of honesty, potentially contributing to misguided credibility assessments and miscarriages of justice in the legal system. 相似文献
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Tsachi Ein-Dor Adi Perry-Paldi Tal Daniely Karin Zohar-Cohen Gilad Hirschberger 《心理学、犯罪与法律》2016,22(10):945-956
Are groups superior to individuals in detecting lies, and are there certain personality traits that significantly contribute to a collective lie-detecting capability? In the current research, we compared the ability of small groups to detect deception compared with individuals, and further examined whether small groups comprising more members high in attachment anxiety would show superior performance in detecting deceit. To this end, we asked 233 participants (40 groups and 113 individuals) to watch a series of clips showing a person making either truthful or untruthful statements, and then decide whether the speaker was honest or dishonest. Results confirmed our expectations and showed superior deceit-detection abilities in small groups, and that this ability was proportionate to the number of people high in attachment anxiety in the group. These results are discussed from the perspective of social defense theory, and the utility of diverse social groups in coping with diverse threats. 相似文献
179.
目的探讨一种适用于小体积生物物证检材的包装方式。方法选择M4型螺丝钉作为研究对象,经去污消毒处理,通过手握方式转移人体脱落细胞到其表面,对螺丝钉采用两种不同的包装方式(滤纸包裹和悬空固定),经KingFisher Flex自动提取工作站进行DNA提取,从基因座等位基因检出情况、STR分型谱带峰高、均衡性等方面比较两种包装方式对螺丝钉上DNA检出率的影响。结果悬空固定包装螺丝钉实验组获得的STR分型谱带峰高、均衡性等方面均优于滤纸包裹包装实验组,其在基因座检出数量、分型完全相同样本数及有效分型样本数方面也多于滤纸包裹包装实验组。结论为降低微量生物检材DNA二次转移造成的损耗,提高小体积生物检材DNA的检出率,建议对小体积生物检材采用悬空固定方式进行物证包装。 相似文献
180.
《Science & justice》2021,61(6):771-778
The current scientific techniques for locating body fluids focus on quick and effective methodologies for easy and reliable identification. Efficient detection and identification of body fluids play a vital role in establishing the ‘corpus delecti’ of a crime. Non-destructive techniques such as the use of Alternate Light Sources (ALS) have been exploited for crime scene searches over large areas and detection of body fluids such as blood, semen, vaginal secretions, and saliva on a range of substrates. Tears are rarely found but can be considered as potential body fluid evidence due to their unique biochemical and molecular properties. Tears are secreted in response to physical or emotional stimuli. Due to the small volume of secretions, they are often overlooked in the crime scene. Tears may be found on surfaces such as clothing, bedding, tissue, handkerchief, or balaclava. The use of ALS to locate tears on tissue paper and fabric surfaces was tested which were not apparent to the naked eye. Tears stains were successfully detected on surfaces of forensic interest with varying sample ages up to three months with a broad excitation spectrum between 254 nm and 410 nm. Dried stains on tissue paper and fabric substrates were better detected with sharp margins, clear stain pattern visibility, and fluorescence intensity in comparison with moist and fresh stains. Tears stains can hence be detected with the use of ALS and suitable filter combinations under normal conditions and do not require any specific settings to locate them. These findings are suggestive for easy and quick identification of tears on large surfaces and as a presumptive test for forensic casework evidence examination. 相似文献