西洋参茎叶皂甙单体Rb_3对大鼠血流动力学及单钙通道活动的影响

单体皂甙Ｒｂ３自西洋参茎叶皂甙中提取。Ｒｂ３３０ｍｇ·ｋｇ－１可使麻醉大鼠在体心脏的ＭＡＰ，±ｄＰ／ｄｔｍａｘ和ＬＶＳＰ减少。用斑片钳的连细胞电压钳法证明．Ｒｂ３３００ｍｇ·Ｌ－１使Ｌ、Ｂ、Ｔ型钙通道的开放时间缩短、开放概率减少，其作用与异搏定３７．５ｍｇ·Ｌ－１相似，与ＢａｙＫ８６１１５μｍｏｌ·Ｌ－１作用相反。确切地证明Ｒｂ３对钙通道有阻滞作用。     

小鼠卵细胞质内显微注入单精子受精的实验研究

为了探讨提高小鼠卵细胞质内单精子注入受精率的方法，选取鼠龄１２－１４周的健康昆明白小鼠作为精子和卵子的供体，受用ＩＣＳＩ技术，以受精后二细胞卵裂的形成率为指标，了解不同采卵时间，不同微注射针参数及不同培养液对细胞质单精子注入的影响。结果表明，ｈＣＧ注射后１８－１９ｈ采卵，用针尖内径为４－５μｍ，斜面角度为３５－４０度的微注射针进行ＩＣＳＩ操作受精后卵子置ＣＺＢ中培养可获得较多的２细胞胚，卵裂率明显     

随机微分方程特征值期望的上界估计

利用变分原理,从不同角度,讨论了随机微分方程特征问题特征值的性质,给出了其期望值的两个上界估计式。     

RESEARCH ON A REAL-TIME CONTROL SYSTEM OF LOW POWER DISSIPATION FOR CONTINUOUS CYCLIC PERITONEAL DIALYSIS(CCPD) CYCLER

FOREWORDPeritonealdialysisrepresentssoluteandfluidexchangemainlybetweenperitonealcapillarybloodanddialysissolutionintheperitonealcavity'CombinedwithhemodialySisandrenaltransplantation,peritonealdialysisisusedmainlyforthetreatmentofrenalfailure,particularlyforchronicfailure'In1976,Prof'Popovichdevelopedcontinuousambulatoryperitonealdialysis(CAPD)basingontheconceptofcontinuousequilibrationdialysis('1'Fromthenon,peritonealdialysisfounditsclinicaluse'Continuouscyclicperitonealdialysis(CCPD…     

戊四氮诱发大鼠全身强直-阵挛性癫痫发作诱导丘脑c-fos癌基因表达

首次运用Fos癌蛋白抗体免疫组化法详细研究了戊四氮诱发大鼠全身强直-阵挛性癫痫发作诱导丘脑c-fos癌基因表达的动态分布。主要结果是:腹腔内注入戊四氮诱导大鼠癫痫发作后0.5h,丘脑室旁核出现低密度的Fos-免疫阳性(Fos-ir)细胞核标记;3h时,中等密度的Fos-ir标记扩布至大部分丘脑中线和板内核群及网状核;6h时,所有上述丘脑核群的Fos-ir标记普遍增为中等至高密度。结合文献报道,上述结果提示:丘脑室旁核很可能是戊四氮诱发大鼠全身强直-阵挛性癫痫发作的重要起源部位之一;丘脑中线和板内核群及网状核很可能在此种癫痫发作的病理生理机制中起重要作用。     

Comparative study on healing process between vascularized and non-vascularized autogenous bone grafts]

This study made a histological comparison (light microscope and transmission electron microscope) between vascularized bone graft (VBG) and non-vascularized bone graft (NVBG) in mandible of dog.The study showed:the healing process of VBG was the same as that of bone fracture.The "creeping substitution" process of NVBG was imbued with the inflammation induced by dead bone.There was no significat difference on the bone union between VBG and NVBG perhaps for the recipient region was better vascularized.     

米氮平治疗神经性厌食症的疗效对照研究

目的：观察米氮平对神经性厌食症的疗效。方法：42例符合CCMD-3神经性厌食症患者被随机分成2组，分别给予米氮平和5-羟色胺再摄取抑制剂（SSRIs）治疗12周，而后随访12周。比较患者治疗前后的体重变化、汉密尔顿抑郁量表（HAMD）和汉密尔顿焦虑量表（HAMA）评分及药物不良反应。结果：共38例患者完成治疗全过程，其中米氮平组20例，SSRIs组18例。在治疗6周时，米氮平组的体重增加大于SSRIs组，差异有显著性（P〈0．01）；治疗12周时，两组体重增加值差异没有显著性。治疗后两组HAMD和HAMA评分均明显减低（P〈0．01），但两组间差异无显著性（P〉0．05）。两组均未出现严重的药物不良反应，主要不良反应SSRIs组为胃肠道不适，米氮平有嗜睡、体重增加等。结论：米氮平能明显提高神经性厌食症患者的食欲和体重，改善焦虑抑郁情绪，依从性好，起效时间早于SSRIs，值得在临床上选用。     

Quantitative evaluation of recall and precision of CAT Crawler,a search engine specialized on retrieval of Critically Appraised Topics

Background

Critically Appraised Topics (CATs) are a useful tool that helps physicians to make clinical decisions as the healthcare moves towards the practice of Evidence-Based Medicine (EBM). The fast growing World Wide Web has provided a place for physicians to share their appraised topics online, but an increasing amount of time is needed to find a particular topic within such a rich repository.

Methods

A web-based application, namely the CAT Crawler, was developed by Singapore's Bioinformatics Institute to allow physicians to adequately access available appraised topics on the Internet. A meta-search engine, as the core component of the application, finds relevant topics following keyword input. The primary objective of the work presented here is to evaluate the quantity and quality of search results obtained from the meta-search engine of the CAT Crawler by comparing them with those obtained from two individual CAT search engines. From the CAT libraries at these two sites, all possible keywords were extracted using a keyword extractor. Of those common to both libraries, ten were randomly chosen for evaluation. All ten were submitted to the two search engines individually, and through the meta-search engine of the CAT Crawler. Search results were evaluated for relevance both by medical amateurs and professionals, and the respective recall and precision were calculated.

Results

While achieving an identical recall, the meta-search engine showed a precision of 77.26% (±14.45) compared to the individual search engines' 52.65% (±12.0) (p < 0.001).

Conclusion

The results demonstrate the validity of the CAT Crawler meta-search engine approach. The improved precision due to inherent filters underlines the practical usefulness of this tool for clinicians.