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毒鼠强在中毒死亡犬体内死后再分布的研究

发布时间:2018-07-11 15:38

  本文选题:毒鼠强 + 死后分布 ; 参考:《山西医科大学》2006年硕士论文


【摘要】:目的 (1) 建立毒鼠强灌胃致死的动物模型和死后再分布研究动物模型;观察犬的毒鼠强中毒表现和死后各组织脏器的病理变化; (2) 研究毒鼠强在灌胃死亡犬体内的分布、死后再分布规律,为毒鼠强中毒案件的法医学鉴定提供科学依据; (3) 建立毒鼠强死后弥散研究动物模型,研究毒鼠强在犬体内的死后弥散特点,探讨毒鼠强死后再分布的机制。 方法 1.动物模型及检材提取 1.1 死后分布模型 取犬6只,将犬左侧卧位固定于犬台,按3倍LD_(50)剂量(0.46mg/kg体重)(根据人毒鼠强LD_(50)(0.1mg/kg)按体型系数推算),用米汤汁稀释至0.1mg/ml灌胃,等体积米汤汁冲洗。观察其生命体征变化,心跳、呼吸和角膜反射全部消失后,迅速解剖动物,采集心、肺、肝、脾、肾、胃、脑、胆汁、尿、心血、周围血和肌肉等组织脏器和体液,检测其中毒鼠强含量,每只犬的检材在24h内检测完毕。 1.2 死后再分布模型 取犬9只,随机分为常温实验组(3只)、4℃实验组(3只)和-20℃实验组(3只)。染毒方法同死后分布模型。分别置于常温、4℃和-20℃保存,于死后0、2、4、8、24、48和72h分别取心血、周围血、肝脏、大脑和肌肉,检测其中毒鼠强含量。死后72h解剖犬,提取心、肝、脾、肺、肾、脑和心血等检材,检测其中毒鼠强含量。 1.3 死后弥散模型 取犬6只,随机分为灌胃后去胃组(3只)和处死后灌胃(3只)组。 处死后灌胃组 将犬左侧位固定于犬台,置胃管后,夹闭气管,,待呼吸、心跳和角膜反射消失后,按3倍LD_(50)剂量(0.46mg/kg体重)(根据人毒鼠强LD_(50)(0.1mg/kg)按体型系数推算),用米汤汁稀释至0.1mg/ml灌胃,等体积米汤汁冲洗。置于室温下,于灌胃后0、2、4、8、24和48不同时间点取心血,每次取材后将肌肉和皮肤逐层缝合,尽量保持机体的完整性。死后72h解剖犬,提取心、肝、脾、肺、肾、脑和心血等检材,检测其中毒鼠强含量。 灌胃后去胃组 染毒死方法同死后分布模型。当犬死亡后立即开腹,结扎幽门和贲门,去除胃,将肌肉和皮肤逐层缝合,置于室温下,检材提取和检测同处死后灌胃实验组。 2.病理检材处理 实验犬角膜反射、呼吸和心跳全部消失时,迅速解剖动物,取心、肝、脾、肺、肾、脑、胃和肌肉等组织,用4%甲醛固定,石蜡包埋,切片,HE染色,光镜下观察。 3.毒鼠强的检测 组织匀浆后,碱化处理,苯萃取,气相色谱/质谱联用检测,利用毒鼠强气相色谱t_r和质谱特征离子峰定性,内标法和工作曲线法定量。
[Abstract]:Objective (1) to establish the animal model of tetramine to kill by stomach and to study the animal model of postmortem redistribution. To observe the manifestation of tetramine poisoning in dogs and the pathological changes of tissues and organs after death. (2) to study the distribution of tetramine in dead dogs and the regularity of postmortem redistribution. To provide scientific basis for forensic identification of tetramine poisoning cases. (3) to establish the animal model of dispersion study of tetramine after death. To study the postmortem dispersion of tetramine in dogs and the mechanism of postmortem redistribution of tetramine. Methods 1. Animal model and sample extraction 1.1 postmortem Six dogs were selected from the distribution model. The left supine position of the dog was fixed on the canine table. At the dose of 3 times LD50 (0.46mg/kg body weight) (calculated according to the body shape coefficient of human tetramine LD50 (0.1mg/kg), the dog was diluted with rice soup to 0.1mg/ml and washed with equal volume rice soup. To observe the changes of vital signs, heartbeat, respiration and corneal reflex, dissect animals rapidly, collect heart, lung, liver, spleen, kidney, stomach, brain, bile, urine, heart blood, peripheral blood and muscle, and other tissue organs and body fluids. The content of tetramine was detected. The samples of each dog were detected within 24 hours. They were randomly divided into 4 鈩

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