溺死及死后入水兔肺组织中硅藻分布

Diatoms in Drowned and Postmortem Immersed Rabbits' Lungs

目的研究溺死及死后入水兔肺组织中硅藻含量、大小和种类的差异。方法将62只新西兰大白兔随机分为生前入水组(n=30)、死后入水组(n=30)和陆地死亡组(n=2),采用微波消解-扫描电镜法对各肺叶中的硅藻进行定性和定量分析。结果生前入水组各肺叶中均能检出硅藻,以小环藻、直链藻为主;死后入水组肺叶中以小环藻为主,某些肺叶中可无硅藻检出。左肺尖叶、右肺中间叶、右肺心叶的硅藻检出率在两组间差异有统计学意义(P<0.05)。结论采用微波消解-扫描电镜法分析生前溺水与死后入水兔肺组织内硅藻含量、大小和种类的分布,为法医学硅藻检验理论提供了一定的参考。

Objective To investigate the numbers, sizes and types distribution of diatoms in drowned and postmortem immersed rabbits’ lungs. Methods Sixty-two rabbits were randomly divided into drowning group （n=30）, postmortem immersion group （n=30） and land death group （n=2）, and the diatoms in each lung lobe were analyzed quantitatively and qualitatively by microwave digestion and scanning electron microscopy. Results In the drowning group, the diatoms were detected in each lung lobe with Cyclotella and Melosira in the majority. In the postmortem immersion group, Cyclotella was in the majority. And the diatoms weren’t detected in some lung lobes in postmortem immersion. There were significant dif-ferences in the detection rates of upper lobe of left lung, middle lobe and cardiac lobe of right lung in two groups （P〈0.05）. Conclusion Based on the microwave digestion and scanning electron microscopy, the numbers, sizes and types distribution of diatoms in drowned and postmortem immersed rabbits ’ lungs can be analyzed and used as references for testing theory.