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In the forensic literature, fatal dehydration predominantly concerns young children or incapacitated elderly persons. The postmortem diagnosis of fatal dehydration can be challenging to confirm, especially if the preceding circumstances are unknown. Here presented is a case of a 23‐year‐old man who died while held in an isolation cell during police custody for 18 days. Autopsy findings were unspecific, but vitreous fluid analysis showed 192 mmol/L sodium, 179 mmol/L chloride, 16 mmol/L potassium, 352 μmol/L (3.98 mg/dL) creatinine, and 81 mmol/L (226.9 mg/dL) urea nitrogen. Based on the findings and circumstances, the cause of death was determined as severe dehydration and manner of death accident. This case illustrates the importance of performing postmortem biochemistry. 相似文献
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将12头断奶仔猪分为3个处理组(丁酸钠组:基础日粮 1 g/kg丁酸钠,抗生素组:基础日粮 抗生素,复合组:基础日粮 抗生素 1 g/kg丁酸钠),饲喂4 周后,采用组织学和扫描电镜技术,对仔猪小肠黏膜上皮和杯状细胞的显微和超微结构进行了观察研究。结果显示,各试验组的空肠和回肠黏膜结构完整,层次清晰,肠绒毛排列整齐,柱状细胞结构清晰,丁酸钠组和复合组肠绒毛粗壮,而抗生素组肠绒毛顶端偶见肠上皮脱落,肠绒毛相对较细;各试验组回肠的杯状细胞数量为空肠的1.3~2.2倍,且以复合组的杯状细胞数最多,丁酸钠组次之,抗生素组最少;各试验组空肠和回肠肠上皮表面微绒毛结构清晰,排列整齐,复合组的细胞衣最厚且均匀,丁酸钠组次之,抗生素组较薄。表明,丁酸钠能促进杯状细胞增殖,改善小肠黏膜上皮细胞的形态结构,进而促进仔猪的消化吸收,提高其生产性能,其在这些方面的作用均优于抗生素。 相似文献
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Kreuzer HW Horita J Moran JJ Tomkins BA Janszen DB Carman A 《Journal of forensic sciences》2012,57(1):75-79
Sodium and potassium cyanide are highly toxic, produced in large amounts by the chemical industry, and linked to numerous high-profile crimes. The U.S. Centers for Disease Control and Prevention has identified cyanide as one of the most probable agents to be used in a chemical terrorism event. We investigated whether stable C and N isotopic content of sodium and potassium cyanide could serve as a forensic signature for sample matching, using a collection of 65 cyanide samples. Upon analysis, a few of the cyanide samples displayed nonhomogeneous isotopic content associated with degradation to a carbonate salt and loss of hydrogen cyanide. Most samples had highly reproducible isotope content. Of the 65 cyanide samples, >95% could be properly matched based on C and N isotope ratios, with a false match rate <3%. These results suggest that stable C and N isotope ratios are a useful forensic signature for matching cyanide samples. 相似文献
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In using infrared or infrared-enhanced photography to examine gunshot residue (GSR) on dark-colored clothing, the GSR particles are microscopically examined directly on the fabric followed by the modified Griess test (MGT) for nitrites. In conducting the MGT, the GSR is transferred to treated photographic paper for visualization. A positive reaction yields an orange color on specially treated photographic paper. The examiner also evaluates the size of the powder pattern based on the distribution of nitrite reaction sites or density. A false-positive reaction can occur using the MGT due to contaminants or dyes that produce an orange cloud reaction as well. A method for enhancing visualization of the pattern produced by burned and partially unburned powder is by treatment of the fabric with a solution of sodium hypochlorite. In order to evaluate the results of sodium hypochlorite treatment for GSR visualization, the MGT was used as a reference pattern. Enhancing GSR patterns on dark or multicolored clothing was performed by treating the fabric with an application of 5.25% solution of sodium hypochlorite. Bleaching the dyes in the fabric enhances visualization of the GSR pattern by eliminating the background color. Some dyes are not affected by sodium hypochlorite; therefore, bleaching may not enhance the GSR patterns in some fabrics. Sodium hypochlorite provides the investigator with a method for enhancing GSR patterns directly on the fabric. However, this study is not intended to act as a substitute for the MGT or Sodium Rhodizonate test. 相似文献
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介绍了敌鼠和溴敌隆抗凝血杀鼠药的定性定量分析方法.在酸性条件下,选用液-液提取和C_(18)柱固相萃取方法处理生物样品,用高效液相色谱法和薄层色谱方法定性定量分析.方法适用于中毒案件的检验. 相似文献
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Daniele Gibelli M.D. Alberto Brandone B.Sc. Salvatore Andreola M.D. Davide Porta B.Sc. Elena Giudici M.D. Marco Aurelio Grandi M.D. Cristina Cattaneo Ph.D. M.D. 《Journal of forensic sciences》2010,55(4):1092-1097
Abstract: Very little literature exists on gunshot wounds on decomposed material. In this study, seven pig heads underwent a shooting test. Entrance wounds from the first head underwent neutron activation analysis (NAA) and histological testing immediately after the firing test; the other six heads were exposed to two different environments (open air and soil) and analyzed by radiochemical and histological tests every 15 days. Gunshot wounds in air maintained their morphological characteristics, and those in soil showed severe alteration after 5 weeks. Microscopic testing verified positive results for lead in all gunshot wounds in open air, whereas in most of those in soil lead could not be detected. Radiochemical analysis performed by NAA yielded for all gunshot wounds but one antimony quantities in the range of 0.07–13.89 μg. In conclusion, it may be possible to detect residues of antimony even in degraded tissues. 相似文献
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