Barium blocks cell membrane and tight junction conductances inNecturus gallbladder epithelium

The site and concentration dependence of the blocking effect of Ba²⁺ onNecturus gallbladder epithelium has been investigated. A new approach was used which combines time-dependent electrical cell coupling analysis with intermittently performed measurements of transepithelial and apparent intracellular impedance. From the coupling pulse data the sum of apical and basolateral membrane conductances is obtained, which is then held constant during fitting of the impedance data. This combination technique yields more reliable estimates of apical and basolateral membranes resistances (R _a,R _bl) and of tight junction resistance (R _j) than our previous impedance analysis technique. Using the new approach we have found that luminal Ba²⁺ concentrations between 0.5 and 1.0 mmol/l increaseR _a with saturation-type kinetics without affectingR _bl andR _j, while higher luminal Ba²⁺ concentrations progressively increaseR _j. Corresponding effects were observed under serosal Ba²⁺. The results validate the new impedance analysis approach and demonstrate that millimolar concentrations of Ba²⁺ block tight junction conductances. Accordingly, Ba²⁺ can no longer be considered a tool to exclusively alter cell membrane resistances in epithelia.     

兰西拉光缆工程沿线水源卫生调查

目的 了解青藏线水源水质卫生状况,为施工部队水源选择、洁治消毒提供参考依据。方法 硬度使用ＥＤＴＡ－２Ｎａ进行滴定,其余指标使用８８型检水检毒箱测定。结果施工沿线基本无现成可利用的水源,所调查２２个水源中９个存在生物污染,３个水源氯化物或硫酸盐严重超标;５个水源总铁严重超标。结论 摸清了放工沿线水源水质卫生状况,为部队施工和以后执行任 务时选择水源、进行水质改善提供了科学依据。     

失火烟雾吸入与肺损伤

目的　观察失火烟雾吸入引起肺损伤的表现。方法　对 117例失火烟雾吸入者的临床表现进行分析 ,并进行了相应的大鼠染毒实验。结果　临床上主要表现为上呼吸道和肺部的刺激和炎症反应 ,动脉血氧分压降低。染毒大鼠支气管肺泡灌洗液中细胞总数及中性白细胞数增高 ,磷脂组分改变。病理形态学可见炎症浸润、间质水种及肺水肿。结论　失火烟雾吸入可致急性呼吸道损伤 ,表现为刺激性气道炎、肺泡炎及肺水肿。     

绿色防火电缆隧道的研究

综述了国内外电缆隧道火灾概况,分析了电缆阻燃防火存在的问题,提出了绿色防火电缆隧道的设计方案,探讨了绿色防火电缆隧道的安全性能、经济效益和环保效果。     

基于环网柜可视接地点的旁路快速转换接头的研制

通过某种环网柜具备接地线外露的特点,开发一种旁路电缆快速接入装置,将该柜型外露接点与旁路电缆完成电气连接,并且利用环网柜负荷开关三工位特点,将其接地工位临时变换成合闸工位,实现临时电源通过旁路电缆线路向环网柜用户供电。     

中国高压电缆运行 情况简要分析

110kV及以上高压电缆在中国大陆地区运行已有40多年的历史,本文简要分析了高压电缆系统在电缆终端、接头、本体、接地系统等方面出现过的主要问题,总结了国内北京、上海、广州等地区在高压电缆运行维护方面的主要经验和先进技术手段。     

电力电缆的预防性试验

主要叙述了电缆做预防性试验及其试验项目、方法和要求，以及需注意的问题。     

电缆附件安装操作技能对安装质量的影响（3）

本文对安装中运用刀具不当所产生的负面影响和电缆附件安装中安装工艺的要点作了简要分析。     

110kV电缆户外终端局部发热分析

本文通过红外测温发现某品牌的110kV电缆户外终端30多套存在局部发热现象,对存在局部发热110kV电缆户外终端进行跟踪测量和3次解剖,从检测分析、模拟计算和解剖现场分析,最终确认人为安装因素是其存在局部发热的主要原因,并提出了建议后续处理措施。     

Sensory outcomes of the anterior tongue after lingual nerve repair in oropharyngeal cancer

Primary treatment of oropharyngeal cancer often involves surgical resection and reconstruction of the affected area. However, during base of tongue reconstruction the lingual nerve is often severed on one or both sides, affecting sensation in the preserved tissue of the anterior tongue. The loss of specific tongue sensations could negatively affect a person's oral function and quality of life. The aim of this study was to explore the effects of different types of lingual nerve intervention on sensory function for patients with base of tongue cancer as compared to healthy, age-matched adults. Subjects included 30 patients who had undergone primary oropharyngeal reconstruction with a radial forearm free-flap and 30 matched controls. Sensations tested were temperature, two-point discrimination, light touch, taste, oral stereognosis and texture on the anterior two-thirds of the tongue. Results indicated that type of surgical nerve repair may not have a significant impact on overall sensory outcomes, providing mixed results for either nerve repair technique. Sensations for the nonoperated tongue side and operated side with lingual nerve intact were comparable to matched controls, with mixed outcomes for nerve repair. The poorest sensory outcomes were observed in patients with the lingual nerve severed, while all patients with lingual nerve intervention exhibited deteriorated taste sensation on the affected tongue side. Overall, patients in this study who had undergone oropharyngeal reconstruction with lingual nerve intervention exhibited decreased levels of sensation on the operated tongue side, with minimal differences between types of lingual nerve repair.