专业修复牙膏 堵“暴露”防敏感

牙齿敏感源于牙本质暴露牙釉质是牙齿表面的保护层，它是半透明的．却是全身最硬的组织。牙釉质保护着牙齿内部的牙本质及牙齿的其他结构。牙本质由成千上万的微细牙本质小管组成，直接与神经相连。如果牙釉质被破坏．牙本质暴露．外界的刺激就会引起牙本质小管内的牙神经短暂而尖锐的疼痛．出现牙齿敏感。日常生活中．牙龈萎缩、刷牙用力过大，过多摄八酸性饮料或夜间磨牙等都容易造成牙本质暴露。

Evaluation on Killing Effects of Sensitive Plant Growth Inhibitors on Eupatorium adenophorum

[Objective] Considering invasion of Eupatorium adenophorum, a growth in-hibitor of the plant was developed based on plant sensitivity, to make evaluation on control effects and to determine the optimal concentration. [Method] According to field test method, the effects of treatments with growth inhibitor at 0.5%, 1%, 1.5%and 2% on Eupatorium adenophorum were explored and the growth of other weeds was observed to research selectivity of plant inhibitor on the plant. [Result] The growth inhibitor had significant effects on ground parts of Eupatorium adenophorum. Specifical y, after 2 h, Eupatorium adenophorum was damaged seriously and the damage degree went worse upon inhibitor concentration. After 5 d, the control effect of the inhibitorreached 41.5% with concentration at 1.5%, reached 90.2% with the concentration at 1%, and 100% with the concentration at 1.5% and 2%. After 15 d, the control effect achieved 64.6%, 91.7%, 98.9% and 100% with concentrations at 0.5%, 1%, 1.5% and 2%. Stil , the effects of growth inhibitors on root system were limited. For example, new branches would grow from base part if the inhibitor con-centration is too low. On the other hand, the growth inhibitor is of sensitivity and selectivity, which would not hurt other plants. [Conclusion] It is feasible to rapidly control growth and development and even kil Eupatorium adenophorum based on plant sensitivity and it is proved that the growth inhibitor at 1.5% would considerably restrict and kil Eupatorium adenophorum. Therefore, the concentration of growth in-hibitors should be over 1.5%.

抹去夏日的痕迹

又是骄阳似火时，又到炎炎夏日，正是阳光明媚、热情奔放的季节。可是，女性朋友对这样的季节有着“爱恨交加”的复杂情感。无论是旅游、外出，还是游泳。总怕阳光留下古铜色的性感印记。这是一个享受的季节，也是需要防晒的季节——

医院跨网文件安全交换技术设计与实现方案

目的为了实现医院内网与互联网文件的安全交换,确保内网敏感数据不泄露和防止内网感染计算机病毒。方法通过网闸、终端管理系统、EDR、数据防泄露技术和防病毒技术,在医院内网和互联网之间建立了文件安全交换通道。结果利用人工或数据防泄露系统对交换文件进行审核可以有效防止敏感数据泄露,建立的计算机病毒检测与响应体系可以最大限度检测进入内网文件的安全性,降低了因文件交换给内网带来的计算机病毒风险。结论通过一系列的安全技术手段和安全防范措施,形成了相当完善的内外网文件交换体系,在医院文件交换需求和内网安全需要之间达到了最佳平衡点。

Detection of Antibody to Hepatitis Delta Virus in Human Serum by Double Antigen Sandwich ELISA

A simple rapid detection of antibody to hepatitis delta virus (anti-HDV) in human serum was developed by using double antigen sandwich ELISA. HDV gene fragment encoding HDAg was isolated from a Chinese patient infected with HDV by RT-PCR, and a high-efficient expression HD-PQE31 strain was constructed with the fragment. We obtained high titer and good quality hepatitis delta virus protein purified by Ni-NTA metal-affinity chromatography, which was identified by Western blot and ELISA, then we set up the double antigen sandwich ELISA for detection of anti-HDV in human serum, and the performance of the sandwich ELISA was evaluated in terms of specificity and sensitivity. Results were: 1) The purified HDAg protein’s purity was 90%, and its ELISA titer was 1/100 000. 2) 42 anti-HDV positive sera were detected and showed that the sensitivity of sandwich ELISA was higher than that of competitive ELISA (t=2.44, p<0.01). 3) The inhibitory rates for 2 anti-HDV positive sera by the specific HDAg were 74% and 93% respectively. 4) For the assay of specificity, all 60 samples infected by other hepatitis viruses and 30 normal samples were negative for anti-HDV. These results suggested that the double antigen sandwich ELISA with purified recombinant HDAg showed higher specificity and sensitivity, It can be used in routine laboratories to diagnose the HDV infection.

Present and future of prophylactic antibiotics for severe acute pancreatitis

AIM: To investigate the role of prophylactic antibiotics in the reduction of mortality of severe acute pancreatitis (SAP) patients, which is highly questioned by more and more randomized controlled trials (RCTs) and metaanalyses. METHODS: An updated meta-analysis was performed. RCTs comparing prophylactic antibiotics for SAP with control or placebo were included for meta-analysis. The mortality outcomes were pooled for estimation, and re-pooled estimation was performed by the sensitivity analysis of an ideal large-scale RCT. RESULTS: Currently available 11 RCTs were included. Subgroup analysis showed that there was significant reduction of mortality rate in the period before 2000, while no significant reduction in the period from 2000 [Risk Ratio, (RR ) = 1.01, P = 0.98]. Funnel plot indi-cated that there might be apparent publication bias in the period before 2000. Sensitivity analysis showed that the RR of mortality rate ranged from 0.77 to 1.00 with a relatively narrow confidence interval (P < 0.05). However, the number needed to treat having a minor lower limit of the range (7-5096 patients) implied that certain SAP patients could still potentially prevent death by antibiotic prophylaxis. CONCLUSION: Current evidences do not support prophylactic antibiotics as a routine treatment for SAP, but the potentially benefited sub-population requires further investigations.

Anti-slip security assessment between main cable and saddle of the middle pylon under extreme vehicle loads

The traffic condition of Taizhou Yangtze River Bridge is obtained to a certain extent, according to the traffic investigation nearby Taizhou Bridge. The statistical characteristics of the traffic conditions are acquired by statistical analysis. Simulation of the extreme vehicle loads and the sensitive analysis of load parameters are carried out based on these data complemented, which would guide the determination of the frictional coefficient between the main cables and the saddle.