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死后大鼠皮肤生物力学特性及胶原、弹力纤维含量变化规律

发布时间:2018-06-04 23:47

  本文选题:死亡时间 + 皮肤 ; 参考:《四川大学》2006年硕士论文


【摘要】:研究背景及目的:死亡时间的推测历来是法医病理学研究的重点和难点,以往的研究多利用机体的死后变化来反推其经历的死后间隔时间,对较短期死亡时间的推断有较好的方法,而对较长死亡时间的推断往往误差较大。皮肤是黏弹性体,具有一定的生物力学特性,又是机体死后分解破坏发生较迟的部分,死后的腐败自溶使皮肤的组织结构发生改变而影响其生物力学特性。本研究观察不同环境条件下死后不同时间大鼠皮肤生物力学特性的变化规律,结合其大体、组织学(主要是胶原、弹力纤维)的改变,探索上述三者变化的关联及与死亡时间的相关性,为利用皮肤大体、组织学和生物力学特性的死后改变推断死亡时间,特别是较长的死后间隔时间建立实验动物依据。 方法:健康S-D大鼠54只,雌性,记录身长、体重,随机分为A、B两组,按死后取材时间,A实验组(实验时间:2005年9月23~9月30日,环境温度:23.0~30.5℃)分为死后0h(小时),6h,,12h,1d(天),2d,3d,4d,5d,6d,7d组,B实验组(实验时间:2005年11月31~12月20日,环境温度:2.5~9.0℃)分为死后0h,1d,2d,4d,8d,12d,16d,20d组,每组3只。所有大鼠均以颈脱位法处死,摆放为俯卧位,置于室内、通风、避光环境,防止动物、昆虫破坏,观察死后不同时间大鼠尸体的大体改变。按分组取大鼠背部中线一侧全层皮肤作生物力学测试,测得皮肤的断裂负荷、延伸长度、断裂能量,计算其相应的张应力、延伸率、应变能(面积、体积)密度数值并进行统计学分析;同时取对侧相应部位全层皮肤制作组织化学切片并进行HE染色和丽春红—维多利亚蓝胶原、弹力
[Abstract]:Background and objective: the estimation of the time of death has always been the focus and difficulty of forensic pathology. Previous studies have used the post-mortem changes of the body to push back the postmortem interval. There is a better method for the estimation of the short death time, but the error for the longer death time is often larger. Skin is a viscoelastic body with certain biomechanical properties, and it is also a late part of body decomposition and destruction after death. Post-mortem decomposing autolysis changes the tissue structure of skin and affects its biomechanical properties. In this study, we observed the changes of biomechanical characteristics of rat skin at different time after death under different environmental conditions, combined with the changes of gross and histological (mainly collagen, elastic fiber). To explore the relationship between the three changes and the time of death, we established the experimental animal basis for estimating the time of death by using the changes of gross, histological and biomechanical characteristics of the skin, especially the long postmortem interval. Methods: 54 healthy S-D rats, female, recorded their body length and body weight, were randomly divided into two groups: group A and group A according to the time of postmortem sampling (experimental time: September 23 to September 30, 2005). The environmental temperature was 23.0 鈩

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