路氏乳杆菌JCM1081黏附相关蛋白的初步鉴定

目的研究路氏乳杆菌(Lactobacillus reuteri,也称罗伊氏乳杆菌)JCM1081菌体表面蛋白对其黏附HT-29细胞的影响。方法将路氏乳杆菌JCM1081菌体进行胰蛋白酶、蛋白酶K处理;用氯化锂和盐酸胍对乳杆菌表面的蛋白进行抽提,进行SDS-PAGE后与黏蛋白受体进行Western blot,并对杂交阳性蛋白进行质谱分析鉴定。结果路氏乳杆菌JCM1081菌体经胰蛋白酶、蛋白酶K处理后,其对HT-29细胞的黏附力显著下降(P<0．01);用氯化锂去除路氏乳杆菌JCM1081菌体外表面的S层蛋白后,路氏乳杆菌JCM1081对HT-29细胞的黏附力无显著变化;Western blot结果显示相对分子质量(Mr)为29×103和14×103的两种菌体表面蛋白与黏蛋白受体杂交中出现了强阳性;质谱分析结果显示29×103蛋白与路氏乳杆菌ATCC55730的h0793蛋白相似性高达71．1％。结论路氏乳杆菌JCM1081菌体表面的蛋白参与了乳杆菌的黏附,其中29×103和14×103的两种胞壁表面蛋白能够特异地识别黏蛋白受体并与之结合,29×103蛋白属ABC转运蛋白家族。     

盲人智能探路手杖的研究

本文介绍了盲人智能探路手杖的研究.该系统由单片机控制,采用两只超声波传感器的探测模式,对盲人行进路上的路况进行探测和分析,并针对不同的路况发出相应的提示信息,以达到辅助盲人安全行走的目的.     

Stimulus-dependent activation of c-Fos in neurons and glia in the rat cerebellum

The intent of the present study was to use chemical or electrical stimulation of cerebellar afferents to determine how different stimulation paradigms affect the pattern of activation of different populations of neurons in the cerebellar cortex. Specifically, we analyzed immediate changes in neuronal activity, identified neurons affected by different stimulation paradigms, and determined the time course over which neuronal activity is altered. In the present study, we used either systemic (harmaline) or electrical stimulation of the inferior cerebellar peduncle (10 and 40 Hz) to alter the firing rate of climbing and mossy fiber afferents to the rat cerebellum and an antibody made against the proto-oncogene, c-fos, as a marker to identify activated neurons and glia. In control animals, only a few scattered granule cells express nuclear Fos-like immunoreactivity. Although no other cells show Fos-like immunoreactivity in their nuclei, Purkinje cells express Fos-like immunoreactivity within their somatic and dendritic cytoplasm in control animals. Within 15 min of chemical or electrical stimulation, numerous granule and glial cells express Fos-like immunoreactivity in their nuclei. Cells in the molecular layer express Fos-like immunoreactivity following harmaline stimulation in a time and lobule specific manner; they do not appear to be activated in the electrical stimulation paradigm. Following harmaline injections, there is an initial loss of Fos-like immunoreactivity in the cytoplasm of Purkinje cells; 90 min later, nuclear staining is observed in a few scattered Purkinje cells. Following electrical stimulation, the cytoplasmic staining in Purkinje cells is enhanced; it is never present in the nucleus. Data derived from this study reveal cell-specific temporal and spatial patterns of c-Fos activation that is unique to each paradigm. Further, it reveals the presence of an activity dependent protein in the cytoplasm of Purkinje cell somata and dendrites.     

人缺血脑组织中IP-10和IFN-γ的表达

目的：探讨趋化因子IP-10和细胞因子IFN-γ是否参与人缺血脑损伤过程。方法：将21例脑梗死死亡病例按发病持续时间分为〈7天、7～14天和15～21天3组，以非缺血侧半球做对照，用HE染色法观察炎性细胞浸润情况；通过免疫组织化学方法检测缺血半球脑组织与非缺血半球脑组织中趋化因子IP-10和细胞因子IFN-γ的表达。结果：在〈7天组和7～14天组中，缺血脑组织可见大量炎性细胞浸润。在〈7天组、7～14天组和15～2l天组中，趋化因子IP-10在缺血半球脑组织中的表达高于非缺血半球（分别是1．74倍增高，P〈0．01；1．41倍增高，P〈0．05和1．52倍增高，P〈0．01）。在对细胞因子IFN-γ的检测中发现〈7天和7～14天组中，IFN-γ在缺血半球脑组织中的表达高于非缺血半球（分别是1．65倍增高，P〈0．05和1．32倍增高，P〈0．05）；在15～21天组中，IFN-γ在缺血半球与非缺血半球中的表达没有显著差异（P〉0．05）。结论：在人缺血脑组织中观察到IP-10和IFN-γ的表达，提示IP-10和IFN-γ参与了炎症反应对脑组织的损伤过程。同时也提示IP-10可能参与后期对损伤脑组织的修复。     

Effects of the Long-Term Depletion of Reduced Glutathione in Mice Administered L-Buthionine-S,R-sulfoximine

Effects of the Long-Term Depletion of Reduced Glutathione inMice Administered L-Buthionine-S,R-sulfoximine. SUN, J. D.,RAGSDALE, S. S., BENSON, J. M., AND HENDERSON, R. F. (1985).Fundam. Appl. Toxicol.. 5,913-919. Previous methods to depletein vivo concentrations of reduced glutathione (GSH) have notbeen able to lower tissue GSH levels for extended periods, havebeen toxic, and can alter the metabolism of xenobiotics. A possiblealternative to lower in vivo concentrations of GSH may be theuse of buthionine-S,R-sulfoximine (BSO) in the drinking waterof laboratory animals to inhibit the biosynthesis of GSH. Ithas been previously reported that 20 mM BSO in the drinkingwater given to mice was able to lower GSH levels in a varietyof tissues after 15 days. In order to more fully characterizethe in vivo depletion of GSH in tissues by ingestion of BSOand determine if this method would be suitable in studies requiringdepressed levels of GSH for extended periods, we added differentamounts of this agent to the drinking water given to mice forvarious times up to 28 days. We found that ingested BSO at thehighest concentrtion used in drinking water (30 mM) was ableto maximally lower GSH concentrations in mouse lungs, lung lavagefluid, liver, kidneys, and blood to 59.0 ? 3.6%, 35.0 ? 5.1%,44.3 ? 1.5%, 69.5 ? 3.9%, and 70.0 ? 6.0% of control mice, respectively,for up to 28 days. These lowered concentrations of tissue GSHreturned to control levels after mice were returned to untreateddrinking water for 7 days. The potential toxicity of such treatmentswas also evaluated. Levels of alkaline phosphatase, lactatedehydrogenase, glucose-6-phosphate dehydrogenase, glutathioneperoxidase, and glutathione reductase in lungs and lung lavagefluid, and total and differential cell counts from lung lavagefluid were not different between control and BSO-treated mice.This showed that BSO treatment did not produce indications oflung injury as measured by these biochemical parameters. Serumaspartyl transferase and -glutamyl transpeptidase activitieswere unaffected by the BSO treatments, indicating normal liverfunctions. Lung and liver cytochrome P-450 concentrations werealso not different between controls and BSO-treated animals.Thus, BSO in the drinking water of mice was able to effectivelylower in vivo levels of GSH without eliciting aCUte toxic responses.     

GDM患者脂肪组织中HMGB1表达与产后糖代谢异常的关系

目的研究脂肪组织中高迁移率族蛋白B1(HMGB1)表达增加与妊娠期糖尿病(GDM)患者胰岛素抵抗程度及产后糖代谢异常的关系。方法选择2016年10月至2019年3月期间在海安市中医院诊断为GDM并接受剖宫产的126例患者作为GDM组,选择同期在该院接受剖宫产的健康孕妇150例作为对照组,检测剖宫产当天孕妇血清HMGB1、空腹胰岛素(FINS)的含量及脂肪组织中HMBG1、胰岛素受体底物(IRS)-1、IRS-2的表达水平,计算胰岛素抵抗指数(HOMA-IR)。随访产后1年内糖代谢异常的发生情况并绘制K-M曲线。结果GDM组患者脂肪组织中HMGB1的表达水平、血清HMGB1含量及FINS、HOMA-IR水平明显高于对照组(t值分别为14.496、16.503、19.068、13.446,P<0.05),脂肪组织中IRS-1、IRS-2的表达水平明显低于对照组(t值分别为11.616、10.596,P<0.05);GDM组患者脂肪组织中HMGB-1的表达水平与血清HMGB1、FINS的含量及HOMA-IR的水平呈正相关(r值分别为0.405、0.358、0.405,P<0.05),与脂肪组织中IRS-1、IRS-2的表达水平呈负相关(r值分别为-0.278、0.255,P<0.05);经K-M曲线分析,与GDM组中脂肪组织HMGB1低表达患者比较,HMGB1高表达患者产后1年糖代谢异常累积发生率明显升高(χ^(2)=3.933,P<0.05)。结论GDM患者脂肪组织中HMGB1表达增加与胰岛素抵抗的加重、产后糖代谢异常的发生有关。     

纳催离和苯那普利治疗高血压合并糖尿病动态血压及微白蛋白尿的比较研究

探讨纳催离（吲哒帕胺）治疗高血压（HP）合并Ⅱ型糖尿病（NIDDM）病人降压效应及对微量白蛋白（mAlb)尿的影响,并与苯那普利（洛丁）的疗效相比较,对HP合并NIDDM病人46例给予催离以及44例给予苯那普利治疗6个月,进行用药前后24h动态血压（ABPM）及尿mAlb测定,结果显示：与对照组及自身对照相比,纳催离与苯那普利治疗后,ABPM指标及尿mAlb均显著改善（P＜0．05或P＜0．01）,而两药之间疗效对比无差异,上述结果提示,纳催离治疗HP合并NIDDM病人与苯那普利效果一样,明显降低血压的同时,还兼有降低mAlb的作用。     

多发伤的骨折内固定

目的：认识多发伤中骨折的主要特点,探讨内固定在救治中的意义。方法：回顾1994－08～1999－08间手术救治多发伤66例,对其161处骨折中的98处进行了“仿AO技术”有关方法内固定。结果：骨折均满意愈合;涉及骨折关节51个,功能恢复满意率为96．08％。结论：在多发伤中,骨折、合并伤与并发症远较“一般骨折”复杂、严重;有效固定骨折是一种重要的救命措施;内固定手术应争取在伤后24h进行,但如受条件制约,伤后1－3wk内手术也可获得满意效果;仿AO技术中的某些方法,如拉力螺钉、张力带钢丝及自动加压钢板等,用于内固定可使骨折获得卓有成效的稳定性。