微波辅助提取茯苓中茯苓多糖的研究

目的将微波辅助提取新技术应用于茯苓水溶性多糖的提取，寻求最佳提取工艺。方法采用均匀优化设计试验条件，以苯酚-硫酸法测定样品中多糖含量。对超声辅助提取和传统水提法比较，并对水解前后的微波提取多糖衍生物用毛细管电泳检测。结果最佳提取条件：时间为18min；固液比为1：50；微波占空比42％，此时提取率为2．792％。优于传统。结论微波辅助提取速度更快、提取效率更高；毛细管电泳检测表明微波提取茯苓多糖过程合理，能得到较理想的提取物。     

转基因食品的快速PCR鉴定

用十六烷基-二甲基-乙基-溴化铵(CTAB)法快速高效地从样品中提取了可供分析的基因组DNA,经PCR扩增,鉴定了含有35S启动子和NOS终止子的转基因样品.该方法的灵敏度可达0.1%,并且具有很好的稳定性.     

粘连性小瞳孔白内障超声乳化吸除及人工晶状体植入术

目的探讨粘连性小瞳孔白内障超声乳化吸除手术方法及技巧。方法对36例(42眼)粘连性小瞳孔白内障行超声乳化吸除及人工晶状体植入术,术中不分离虹膜后粘连,利用拦截劈裂法乳化晶状体核,通过4mm大小瞳孔完成手术。结果所有病例视力有不同程度提高,获得生理性圆或近圆瞳孔,主要并发症包括角膜内皮水肿,前房纤维素渗出。结论采用本方法治疗粘连性小瞳孔白内障操作相对简单,术后反应轻,并发症少。     

高效液相色谱法测定人血浆中翁丹西隆浓度

建立了翁丹西隆的高效液相色谱测定法。血浆样品用醋酸乙酯萃取，以ＺｏｒｂａｘＳｉｌｉｃａ为固定相，６０％０．０２５ｍｏｌ／Ｌ乙酸钠缓冲液（ｐＨ４．２）、４０％乙腈为流动相，紫外３１０ｎｍ处测定。采用外标法峰高定量。最低检出浓度达１ｎｇ／ｍｌ，线性范围１．０～４０．０ｎｇ／ｍｌ（ｒ＝０．９９９６），平均回收率为（９５．２２±３．５８）％（ＲＳＤ３．７６％）。用本法测定人血浆中翁丹西隆浓度具有快速、简便、专一性和灵敏度高的优点。     

Astigmatism and visual recovery after phacoemulsification and conventional extracapsular cataract extraction

In this study we wanted to investigate the post-operative astigmatism and visual acuity after phacoemulsification and conventional extracapsular cataract surgery. Patients operated between April and June 1993 (n=150) were retrospectively analyzed. The patients were examined prior to surgery and at day 1, at day 10, and in week 6 post-operatively. The difference between the post-operative log mean visual acuity in the Phaco group and in the CECCE group was significant after 1 and 10 days, however it was not significant (p=0.191) after 6 weeks. The mean astigmatism was significantly less in the Phaco group than in the CECCE group during the whole post-operative check-up period. This study suggests that Phaco results in a lower post-operative astigmatism and an earlier visual rehabilitation compared to the CECCE technique.Abbreviations Phaco Phacoemulsification - CECCE Conventional extracapsular cataract extraction     

The bactericidal activity of pulsed Nd-YAG laser radiation in vitro

Pulsed Nd-YAG laser irradiation of bacteria has been suggested as a possible means of treating contaminated intra-oral sites although relatively few studies have been conducted. In this investigation, the antimicrobial activity of a pulsed Nd-YAG laser was assessed in vitro for a range of oral bacteria using several pulse energies and exposure durations. Pure cultures of each organism were lased in saline suspensions followed by standard colony counting techniques for test and control samples. Microbial inhibition was found to be organism-dependent and varied with energy dose and pulse energy. For all nine test species 120-mJ laser pulses proved more efficient than 80-mJ pulses, with 99.9% kills compared with around 90% kills after exposure to 1800 pulses. These killing activity levels compare favourably with those achieved with other lasers in vitro.     

甜茶素提取物对STZ致高血糖大鼠的降血糖作用研究

目的 :　研究甜茶素提取物对 STZ致高血糖大鼠的降血糖效果及其降糖机制。方法 :　腹腔注射 STZ制备糖尿病大鼠模型 ,取成型的大鼠随机分阳性对照组、甜茶素提取物组和降糖灵组。同时设一正常组。灌胃 3 w后 ,测血糖、果糖胺、胰岛素和 SOD等指标。结果 :　甜茶素提取物能极显著地降低 STZ致高血糖大鼠血糖 ,增强其抗氧化能力 ,同时能刺激胰岛素的分泌。结论 :　甜茶素提取物通过刺激胰岛素的分泌来降低血糖     

Comparison between postoperative astigmatism after classic extracapsular lens extraction and after phacoemulsification with implantation of a Pearce tripod or Pearce vaulted Y-loop intraocular lens

We compared the surgically induced astigmatism after standard extracapsular cataract extraction (ECCE) with the astigmatism following cataract extraction by phacoemulsification. The surgically induced corneal astigmatism was assessed on several occasions, ranging from one day to one year postoperatively. After phacoemulsification, this astigmatism was considerably slighter than after ECCE on day 1 postoperatively and after two and six weeks. However, one year postoperatively, this difference was less clear. We then measured slight against-the-rule astigmatism for both surgical techniques.     

激光荧光检测仪对乳牙合面患龋敏感位点的流行病学研究

目的：定量分析乳牙合面的龋病敏感点位，为指导临床预防和治疗龋病提供依据。方法：采用激光荧光检测仪（DIAGNOdent）检测156名5～6岁儿童共561颗患龋的乳磨牙合面，记录合面龋坏最严重的位点。结果：在上颌第2乳磨牙中，龋坏最严重的位点有60．1％发生在远中窝。在下颌第2乳磨牙中，龋坏最严重的位点有51．2％发生在舌沟；而在下颌第1乳磨牙中，龋坏最严重的位点则易发生在远中窝，占该牙记录位点的34．9％。结论：不同的牙合面患龋严重部位具有统计学规律，提示这些位点是龋坏容易发生和发展的地方，是临床上预防和治疗不可忽略的重要部位。