犬胆肠吻合愈合过程的组织学观察

目的 观察胆肠吻合愈合过程的组织学变化,探讨良性胆管狭窄形成机制。方法 通过制作犬胆总管十二指肠吻合模型,分别于术后3d、1周、3周、3月、6月取材行HE染色、Masson染色及Verhoeff's染色,并进行计算机图像分析测定粘膜下胶原纤维面积百分比。结果 胆肠吻合愈合过程延长,慢性炎症持续存在,胆道粘膜上皮修复较差,成纤维细胞增生活跃,愈合后粘膜下胶原纤维过度沉积,改建较差。结果导致瘢痕增生,吻合口狭窄。结论 胆肠吻合愈合方式属于过度愈合,其原因与胆管壁组织构筑、胆汁刺激作用及肠胆返流有关。     

Histological changes following surgically-assisted rapid tooth movement through resistance reduction and distraction osteogenesis in dogs

Objective To investigate the histological changes of rapid tooth movement in dogs treated by resistance reduction and distraction osteogenesis, aiming to establish an animal model and further to reveal the remodeling mechanism of rapid tooth movement. Methods A total of 8 local hybrid dogs were selected as subjects for this study. The second pre-molar was extracted on both sides. The experimental side underwent alvelor surgery for resistance reduction and a home-made tooth-borne intraoral distraction device was installed for rapid tooth movement, while for the other side (control side) only tooth-borne intraoral distraction device was used for rapid tooth movement. The longest active force-delivery span was 2 weeks, followed by 6-week retention. The distance between the moved tooth and anchor unit was recorded weekly, and radiography was performed for each side before and after distraction. The surrounding tissues including periodontal ligament and alveolar bone were sectioned for histological analysis. Results The average distance of tooth movement was 3.55mm on the experimental side and 1.11mm on the control side. The rate of tooth movement was notably higher (P<0.01) and no significant apical root resorption was detected by X-ray on the experimental side. The active alvelor bone remodeling was found on the tension and pressure sides. However, there was no significant difference between the experimental side and the control side after the retention period. Conclusion The rate of orthodontic tooth movement can be accelerated through resistance reduction and periodontal distraction without any unfavorable effects but at minimal anchorage loss.     

Effect of ulinastatin on hepatic ischemia-reperfusion injury in rats

Objective To investigate the effect of ulinastatin (UTI) on hepatic ischemia-reperfusion injury in rats. Methods Totally 24 adult Sprague-Dawley rats were randomly divided into 3 groups: sham-operated control group (SO group), ischemia-reperfusion group (I/R group) and ulinastatin group (UTI group). Liver in I/R group underwent 1 h of reperfasion after 30 min of ischemia. In UTI group, UTI (2×104 U/kg) was administered to rats 30 min before modeling. The levels of alanine aminotransferase, aspartate aminotransferase and tumor necrosis factor-alpha (TNF-α) in serum were measured and the levels of nitric oxide and malondialdehyde in liver were determined. The histological changes of liver were observed. Results The levels of alanine aminotransferase, aspartate aminotransferase and TNF-α in serum were significantly increased in I/R group compared with those in UTI group (P<0.05). The levels of nitric oxide and malondialdehyde in liver were significantly higher in I/R group than in UTI group (P<0.05).Histological examination of liver indicated that the damages were more severe in I/R group than in UTI group.Conclusion UTI has the ability to inhibit the production of TNF-α and oxyradical, and ameliorate microcirculatory dysfunction in rats with hepatic ischemia-reperfasion injury.     

青春期大鼠实验性精索静脉曲张模型的建立及其对睾丸的影响

目的　研究青春期精索静脉曲张对睾丸的损害 ,探讨精索静脉曲张不育的机理。方法　通过部分结扎左肾静脉建立青春期大鼠实验性精索静脉曲张 (ELV)模型 ,分别于术后 4周和 8周研究双侧睾丸的组织学改变并进行统计学分析。结果　成功建立了ELV模型。该模型大鼠的睾丸病理损害以生精上皮退化 ,精子发生阻滞 ,生精细胞脱落 ,曲精小管萎缩 ,间质水肿最为多见。损害为双侧性 ,且有累进性特点。统计学分析显示 ,ELV大鼠左右侧睾丸平均重量和曲精小管直径均较对照组显著减小 ,睾丸间质面积较对照组显著扩大。结论　ELV大鼠双侧睾丸有严重的累进性病理改变 ,这可能是精索静脉曲张不育的主要原因之一。该模型为研究青春期精索静脉曲张的病理生理及其对附睾的影响提供了有用工具     

犬心房室隔内细胞形态学特征

目的　通过观察犬心房室隔内细胞形态学特征 ,探讨其可能的功能意义。方法　利用光学显微镜 ,通过HE和Masson染色对犬心房室隔标本的细胞形态、排列方式、直径和染色深浅进行细致观察 ,通过透射电镜观察证实光镜所见细胞特征。结果　①心房扩展部可见到四条过渡细胞束与房室结相连 :Ⅰ径自冠状窦壁沿锥形间隙或室间隔肌与右房肌之间向前至房室结后端 ;Ⅱ径自冠状窦口周围沿右房心内膜下至房室结浅层 ;Ⅲ径经三尖瓣隔侧瓣与冠状窦口之间向前经心内膜下至房室结右后端并至房室结的浅层 ;Ⅳ径自左侧心房肌向右下沿室间隔肌上缘至房室结左后端。低倍镜下纤维排列较疏松 ,纤细 ,直径约 9.5 μm ,染色浅淡。高倍镜下细胞呈长形 ,核长圆形与细胞长轴方向一致 ,细胞质染色淡。电镜下细胞特征符合过渡细胞特点。②冠状窦周围见到大量T细胞和少量P细胞及浦肯野细胞。结论　犬心房室隔内有过渡细胞构成的新传导径路 ;冠状窦可能是一个重要的潜在起搏点     

预防车辆事故应坚持＂三抓＂

抓队伍。严把“三关”。一是严格学兵选调，把好入口关。严格执行相关规定，从严把好学兵思想、文化、身体条件和年度兵比例。送训部队要严密组织学兵的思想摸底、文化考核和体格检查，对不符合选调条件的，一律不得送训。各司训机构在学兵报到后，要严密组织思想、文化和身体复查，对复查不合格的学兵，要坚决退回原单位；新训过程中，要坚持全程淘汰制，对现实表现差、驾驶技术不过硬的学兵，实行二次淘汰。二是注重质量标准，把好训练考核关。     

实验性牙周病的观察

本文介绍了一种用豚鼠制作牙周病动物模型的简便方法。实验结果肉眼与组织学所见表明,豚鼠的实验部位具有与临床牙周病相似的改变,提示豚鼠的牙周组织具有较好的易感性,可供牙周病研究使用。     

75207部队开展廉洁文明教学活动

75207部队把廉政建设、端正教学风气当作一项重要任务,经常抓,反复抓。近日,该部广泛开展廉洁文明教学活动,坚持做到以情带兵,文明带兵,廉洁带兵,深受官兵好评。学兵培训期间,该部专门对学员进行尊干爱兵,廉洁文明教育,组织学兵学习《廉洁文明教学规定》和《驾驶学兵培训手册》。同时制定出台廉洁文明教学规定及措施,要求各级带兵骨干和教练班长廉洁自律,做到“不抽学兵一支烟,不喝学兵一口酒,不收学兵一件礼”,坚决杜绝不正之风,以良好的形象搞好学兵培训。     

物流外协的利润损失研究

运用信息经济学和产业组织学的理论，从交易费用、外部经济非内部化、投入品的非有效配置、双重价格一成本加成等方面探讨了物流外协可能导致的利润损失。