小鼠皮肤损伤愈合过程中PI3K/Akt通路的作用

目的探讨小鼠皮肤损伤愈合过程中损伤区磷脂酰肌醇-3-激酶(phosphatidylinositol-3-kinase,PI3K)、磷酸化磷脂酰肌醇-3-激酶(phospho-PI3K,p-PI3K)、蛋白激酶B(protein kinase B,PKB,又称Akt)和磷酸化蛋白激酶B(phospho-Akt,p-Akt)的表达及其随时间的变化规律。方法应用免疫组织化学染色、Western印迹法和real-time PCR技术检测小鼠皮肤损伤不同时间段PI3K、Akt、p-PI3K及p-Akt的变化情况。结果免疫组织化学染色显示,皮肤损伤后,PI3K、p-Akt阳性染色出现在单核细胞和成纤维细胞,峰值出现在组织修复期。Western印迹法显示,各个时间段均有PI3K、p-PI3K、Akt、p-Akt的阳性条带,其中p-PI3K、p-Akt表达的峰值出现在炎症期和增生期,PI3K、Akt表达的高峰出现在组织重建期。real-time PCR结果显示,PI3K m RNA的峰值出现在炎症期和组织重建期,Akt m RNA的峰值出现在组织重建期。结论在皮肤损伤愈合过程中,PI3K、Akt、p-PI3K及p-Akt的表达变化呈现不同的规律性并有较好的时间依赖性,PI3K/Akt通路的表达规律可以用于法医学损伤时间推断。     

不同环境条件下大鼠皮肤死后大体和组织学改变

死亡时间的推测是法医病理学研究的重点和难点,对晚期死亡时间的推断误差较大。皮肤是机体死后分解破坏发生较迟的部分。不同环境条件下死后不同时间大鼠皮肤大体、组织学的改变,为推测较长的死后间隔时间建立实验动物依据。利用皮肤大体、组织学改变可望较系统和准确地推测晚期死亡时间。     

Uniqueness of the Dentition as Impressed in Human Skin: A Cadaver Model*

Abstract: Bitemark interpretation assumes that the human dentition is unique and that its attributes can be accurately transferred to skin. A cadaver model was used to investigate whether the correct biter could be determined from similarly aligned dentitions once the dentitions were impressed in human skin. One‐hundred dental stone models, which were measured and determined to be unique, were divided into 10 groups based upon similarities of mal‐alignment patterns. One model was randomly selected from each group and bites were produced on unembalmed human cadavers. Metric/angular measurements and hollow volume overlays of the models were compared with the bites made. The percentage of dentitions from each group as well as the 100 dental model population that could not be excluded as the biter was determined. Results showed difficulty distinguishing the biter from individuals with similarly aligned dentitions and in some cases, an incorrect biter appeared better correlated to the bite.     

婴儿手的色泽与手区胃信息影像表达关系研究

目的 研究手区胃影像图基准值的“测量基准”和校验方法。方法 以中西医理论为指导,采用验证医学模式,首先模拟健康胃黏膜的手区胃影像图,然后对10个健康婴儿手色泽的影像图进行分析。结果 健康婴儿整体上最接近健康胃黏膜的标准,健康婴儿的手区胃影像图与健康胃黏膜的手区影像模拟图是相符的,样本与理论推论结果得到互证。结论 以健康婴儿手的色泽为手区胃影像图基准值的“测量基准”是科学的,且易取材。     

手区胃影像图监测胃黏膜寒热变化研究

目的 求证寒热食物与手区胃影像图变化的关联性。方法 采用验证医学模式,采用寒热食物对胃黏膜进行刺激,观察手区胃影像图的变化。结果 寒热对胃黏膜的刺激致使手区胃影像图迅速产生动态响应,寒性食物使手区胃影像图增加白色和青色成分,热性食物使手区胃影像图增加红色成分。结论 手区胃影像图是胃黏膜色泽映射成像的客观表达,寒热是导致胃黏膜色泽发生改变的主要因素之一,手区胃影像图技术可成为验证胃黏膜寒热变化的客观工具。     

芙蓉膏对家兔皮肤软组织感染的抑菌抗炎作用

目的 研究芙蓉膏外敷对家兔体表软组织感染的抑菌抗炎作用。方法 采用纸片琼脂扩散法进行抑菌实验,比较芙蓉膏粉剂溶液、复方黄柏涂剂和青霉素对金黄色葡萄球菌及大肠埃希菌菌株的生长抑制作用。选用50只新西兰家兔进行抗炎实验,将其随机分为正常组,模型组,莫匹罗星组,芙蓉膏低、高剂量组,每组10只。模型复制成功后进行药物干预,光学显微镜下观察组织病理改变;分别于第2、4、7天给药后8 h检测外周血白细胞（white blood cell, WBC）、中性粒细胞（neutrophils, NE）数量,超敏C反应蛋白（high sensitive C-reactive protein, hs-CRP）、肿瘤坏死因子-α（tumor necrosis factor alpha, TNF-α）、白细胞介素-6（interleukin-6, IL-6）水平。结果 芙蓉膏粉剂溶液对金黄色葡萄球菌有抑菌作用（抑菌环直径为2.5 mm）。光学显微镜下可见低、高剂量芙蓉膏均可减少兔后背软组织感染区的炎症细胞浸润,以高剂量芙蓉膏的作用为优。模型复制后2、4、7 d,莫匹罗星组,芙蓉膏低、高剂量组全血WBC、NE计数,血清hs-CRP、TNF-α、IL-6水平均较模型组明显下降（P＜0.05）或呈降低趋势（P＞0.05）;芙蓉膏降低全血WBC计数的作用具有明显的剂量依赖性（P＜0.05）。结论 芙蓉膏对金黄色葡萄球菌生长有抑制作用,高剂量芙蓉膏可减轻软组织感染模型兔的炎症反应,促进创面修复。     

The Response of Skin to Applied Stress: Investigation of Bitemark Distortion in a Cadaver Model*

Abstract: Knowledge of distortional properties of skin is important in bitemark analysis. Thus, the response of skin to stress from bites was investigated. Four sets of models were created from the dentition of one individual. Anterior teeth were systematically removed to vary contact surface area. A biting apparatus was constructed with an integrated load cell. Forty‐six bites were created perpendicular to Langer lines on six cadavers. Rate of force application and bite pressure were controlled. Metric/angular measurement and hollow volume overlays were employed. Distortion produced by each dentition was calculated and assessed. Results showed that as teeth impressed loose tissue, mesial/distal distance increased, angles of rotation flattened, and inter‐canine distance lengthened. An opposite effect was seen in tight tissue. When the surface area of the dentition was reduced, a mixture of these effects was observed. Conclusions indicated that stiffness of the tissue was the most important variable in bitemark distortion.     

Recovery of Latent Fingerprints and DNA on Human Skin*

Abstract: The project “Latent Fingerprints and DNA on Human Skin” was the first systematic research in Europe dealing with detection of fingerprints and DNA left by offenders on the skin of corpses. One thousand samples gave results that allow general statements on the materials and methods used. The tests were carried out according to a uniform trial structure. Fingerprints were deposited by natural donors on corpses. The latent fingerprints were treated with magnetic powder or black fingerprint powder. Afterward, they were lifted with silicone casting material (Isomark^®) or gelatine foil. All lifts were swabbed to recover DNA. It was possible to visualize comparable and identifiable fingerprints on the skin of corpses (16%). In the same categories, magnetic powder (18.4%) yielded better results than black fingerprint powder (13.6%). The number of comparable and identifiable fingerprints decreased on the lifts (12.7%). Isomark^® (14.9%) was the better lifting material in comparison with gelatine foil (10.1%). In one‐third of the samples, DNA could be extracted from the powdered and lifted latents. Black fingerprint powder delivered the better result with a rate of 2.2% for full DNA profiles and profiles useful for exclusion in comparison with 1.8% for the magnetic powder traces. Isomark^® (3.1%) yielded better results than gelatine foil (0.6%).     

Photographic Analyses Using Skin Detail of the Hand: A Methodology and Evaluation,

Skin features have been employed by law enforcement agencies for suspect and victim identification. Comparisons of hand have arisen in casework where images have been submitted where a face was not present but a hand was visible. This research utilizes a collection of 128 hands from employees of the U.S. Army Criminal Investigation Laboratory to examine the frequency and distribution of skin detail on the dorsal surface of the hand. To assess the location of features, the hand was segmented into 14 regions using readily discernible anatomical landmarks. Overall, 2618 pigmented lesions and 92 scars or injuries were documented. When comparing the regions with one another, Regions 1–10 had fewer pigmented lesions than Regions 11–14. There was no pattern to the distribution of scars throughout the regions. The findings presented a foundation for one possible method that may differentiate hands based on the frequency and distribution of such features.     

Pregnancy Loss,Skin-Based Body Modifications and Agency

This article utilizes notions of ‘agency’ to explore the relationship between experiences of pregnancy loss and narratives about related skin-based body modifications. The term ‘pregnancy loss’ is used to denote a range of medical events with potentially far-reaching emotional and social consequences. The research from which the empirical content of this article is drawn seeks to bring together feminist interests and the discipline of human geography to examine experiences of pregnancy loss. Different aspects regarding ‘agency’ are attended to through several practices—namely, the acquisition, display/concealment and narration of skin-based bodily marks like stretch marks and memorial tattoos. This includes a discussion on notions of ‘choice’ in terms of receiving/acquiring changes to the skin through pregnancy and pregnancy loss, regarding which stretch marks and tattoos are often pitted as oppositional. A more complex picture of agency is explored and illustrated with the narratives of several women with pregnancy-loss experiences, highlighting that both kinds of skin-based modifications can be framed in more agential ways, including as appreciated reminders of simultaneous love and loss. In doing so, this article constitutes an attempt to engage with pregnancy loss from a feminist perspective, as encouraged by Linda Layne, and to contribute to feminist scholarship on body modifications.