大鼠肝细胞DNA含量与早期死亡时间关系的图像分析研究

实验选择 15只大鼠 ,处死后 ,在 2 4h内 ,每隔 1h取肝组织块进行细胞学涂片、福尔马林液固定、Feul gen染色、自动图像分析仪测量、统计学处理数据。结果表明 ,肝细胞DNA含量在死后 2 4h内 ,随死亡时间的延长而较有规律的下降。其中积分光密度、平均光密度、异形指数是用来研究死亡 2 4h内肝细胞DNA降解规律 ,并准确推断死亡时间的较好指标。     

The psychodynamics of the presidential assassin and an examination of the theme/graphic variables of his threatening correspondence

A case of fatal Reye's syndrome presenting as the second sudden infant death in a family is described. The increasing interest in fatty change in the liver in cases of sudden infant death syndrome is noted and it is suggested that standardised interpretation of findings is essential if its significance is to be correctly evaluated.     

血尿肝中毒鼠强硅藻土提取GC／NPD检测法

目的建立硅藻土提取气相色谱测定血、尿、肝中毒鼠强的方法。方法原尿液、血液用水稀释、肝匀浆用6％高氯酸沉淀蛋白的上清液倒入硅藻土小柱中，血和尿用苯洗脱，肝用三氯甲烷洗脱，挥干洗脱液，用甲醇定容至0．1ml。结果血提取率98．4％，尿提取率95．6%，肝提取率98．1％。相对标准偏差低于3．2％，检出限低于20ng／ml（g）。结论该法简便、快速，提取率高，适合作为常规毒物分析方法。     

疏肝降脂方治疗脂肪肝临床观察

目的 :观察疏肝降脂方治疗脂肪肝的疗效。方法 :治疗组与对照组同服多酶片与绞股蓝总苷片 ,前者加服疏肝降脂方 ,后者加服复方丹参滴丸 ,1个月后作疗效对比观察。结果 :治疗组显效 2 1例 ,有效 1 2例 ,显效率为 5 8.3% ,总有效率为 91 .7% ;对照组显效 4例 ,有效 1 0例 ,显效率为1 3.3% ,总有效率为 4 6 .7%。两组显效率与总有效率比较 ,差异均有显著性 (P <0 .0 1 )。结论 :疏肝降脂方治疗脂肪肝具有良好的疗效     

挤压家兔后肢导致急性肝损伤和抗氧化能力降低

目的本实验观察挤压家兔后肢导致肝氧化损伤,探讨氧化应激在挤压家兔后肢导致肝损伤中的作用。方法用标准重物间断压迫家兔后肢复制模型。采用生化方法检测ALT和AST活性;分析天平称重方法检测肝脏湿干重比值(W/D);比色法测定肝组织超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GSH-Px)活性和总抗氧化能力(T-AOC)以及丙二醛(MDA)含量变化;并观察肝组织病理学改变。结果血清ALT和AST活性明显增高(P<0.01),肝细胞明显肿胀,肝窦轻度淤血,而肝脏湿干重比值(W/D)轻度增加(P<0.05);肝脏氧化损伤明显加重,MDA含量增高,而肝脏抗氧化能力下降,SOD、CAT、GSH-Px活性和T-AOC分别比对照组降低了17%、29%、24%和21%(P均<0.01)。结论挤压家兔后肢引起急性肝损伤及肝脏的抗氧化能力下降;肝脏局部抗氧化能力下降可能是肝损伤的重要因素。     

蛋白质降解与死亡时间推断的初步研究

目的观察大鼠肝脏肌动蛋白、微管蛋白在死后不同时间的降解情况,为死亡时间的推断寻找客观依据。方法大鼠麻醉致死后置于21℃温度控制系统模拟死后18d的改变,在不同时间点剪取肝脏组织抽提蛋白质,利用westernblot技术检测肌动蛋白、微管蛋白的降解变化并对产物进行半定量分析。结果大鼠肝脏肌动蛋白在死后8d尚可检测,死亡10d后检测不到;在死后2d,α微管蛋白已检测不到,但可检测到β微管蛋白,死亡4d后,β微管蛋白也检测不到。结论肌动蛋白、微管蛋白的死后降解存在差异,其在肝脏组织保存时间的不同可作为死亡时间推断的参数。     

The Ratio of 6β‐Hydroxycortisol to Cortisol in Urine as a Measure of Cytochrome P450 3A Activity in Postmortem Cases

Poisoning can occur with chronic accumulation of a drug due to reduced metabolic capacity; conversely, under‐treatment may occur due to an increased metabolic rate. Over half of all drugs are metabolized by the cytochrome P450 3A complex (CYP3A). The activity of CYP3A can be assessed by the urinary ratio of 6β‐hydroxycortisol to cortisol. The aim of this study was to determine the usefulness of this ratio as a postmortem marker for determining whether altered CYP3A enzyme activity occurred prior to death. In a series of 244 postmortem cases, this ratio ranged from 0.014 to 78.6 (median 3.50). The median was significantly higher (5.14) in a subgroup of 28 cases that exhibited the presence of CYP3A‐inducing drugs. In cirrhosis, the median ratio was 1.69. This pointed to a reduced metabolic capacity of CYP3A. Thus, the ratio may constitute a rough indicator of the CYP3A metabolic capacity, which could be of value in special cases.     

Determination of Acetamiprid and IM‐1‐2 in PostMortem Human Blood,Liver, Stomach Contents by HPLC‐DAD

An HPLC‐DAD method was developed to detect and quantify a neonicotinoid insecticide acetamiprid (ATP) and its metabolite IM‐1‐2 in autopsy samples of a fatal intoxication case. The postmortem blood and tissue distribution of ATP and IM‐1‐2 was determined for the first time. The method showed acceptable precisions and recoveries with relative standard deviations of <10% for ATP level and 1.38 % for IM‐1‐2. The detection and quantification limits for ATP were 0.015 μg/mL and 0.030 μg/mL for blood and were 0.035 μg/g and 0.050 μg/g for liver samples, respectively. The mean contents of ATP were 0.79 μg/g in the liver, 47.35 μg/g in the stomach contents and 2.7 μg/mL in the blood. IM‐1‐2 content was 17.0 μg/g in the stomach contents. ATP and IM‐1‐2 were not detected in the urine. The presence of ATP and IM‐1‐2 in the samples was confirmed by GC‐MS. The method can be exploited in future forensic casework.     

原因不明性不孕症中医证候分析

目的 探讨原因不明性不孕症的中医证候特点,为中药治疗原因不明性不孕症提供辨证依据.方法 根据不孕症诊断标准,将219例不孕症患者分为研究组(原因不明性不孕症)108例和对照组(配偶不育症导致的不孕症)111例,分析并比较两组中医证候分布特征,采用二项分类Logistic回归分析原因不明性不孕症的危险证候,以及中医证候与...     

人体死后肝细胞DNA含量与死亡时间关系的研究

目的研究人体死后肝脏细胞DNA含量变化与死亡时间的关系及影响因素。方法选取46例已知死亡时间的人体肝脏,根据离体肝脏所处的环境温度分为12—19％（A组）和20—27％（B组）两组,每组23例。在死后24～72h内每隔4h穿刺取肝组织1次,制成细胞悬液,经RNA酶消化,PI染色后,用流式细胞仪测定被检测细胞中含不完整DNA的细胞数所占百分比,所得数据经Exp032V1．2软件计算N值。结果死后24～72h肝细胞N平均值,A组从10．91％增至49．72％,B组从16．22％增至69．63％。两组N平均值随死亡时间的延长均逐渐增高,与死亡时间有相关性,A组r值为：0．598,B组r值为0．77357。并且建立了不同环境温度对应的回归方程。结论在不同环境温度下,死后24～72h内人体肝脏细胞DNA降解均随死亡时间的延长和环境温度的升高而逐渐加快,相关数据可望为死亡时间推断提供一定参考依据。