胺碘酮抑制缺血浦肯野纤维起搏离子流

目的观察正常及模拟“缺血”时胺碘酮对绵羊心室浦肯野纤维起搏离子流（Ｉｆ）的影响。方法双微电极电压钳制术,使膜电位过度极化以激活Ｉｆ。结果胺碘酮１×１０－５ｍｏｌ／Ｌ在正常台氏液中显著降低浦肯野纤维Ｉｆ幅值;模拟“缺血”也使Ｉｆ幅值降低,在此基础上,胺碘酮使Ｉｆ幅值进一步减小,加剧了“缺血”对Ｉｆ离子流的抑制作用。结论提示胺碘酮能抑制心肌缺血时心室正常自律性活动。     

Mutational analysis of the PTEN/MMAC1 gene in primary oesophageal squamous cell carcinomas.

AIM: To investigate whether PTEN/MMAC1 mutations play a role in the carcinogenesis of oesophageal squamous cell carcinoma. METHODS: A panel of 33 primary oesophageal squamous cell carcinoma tumour samples and 20 corresponding morphologically normal tissues was examined for mutations in all nine exons of the PTEN/MMAC1 gene by means of polymerase chain reaction single strand conformational polymorphism analysis (PCR-SSCP) and direct DNA sequencing methods. RESULTS: Only one of 33 oesophageal squamous cell carcinomas showed an aberrant SSCP band. Further sequencing analysis of this sample revealed an 802 -29 T-->C substitution in intron 7. PTEN/MMAC1 mutations were not found in the mutational "hot spot" in exon 5, even after direct sequencing of six oesophageal squamous cell carcinoma samples and three normal tissues. However, a deletion of one nucleotide T at position 492 +8 in intron 5 was seen in all samples. CONCLUSION: These results suggest that PTEN/MMAC1 mutations do not play a major role in the carcinogenesis of oesophageal squamous cell carcinoma.     

Development of inflammation after application of mustard oil or glutamate to the rat temporomandibular joint

Application of the small-fibre excitant and inflammatory irritant mustard oil or the excitatory amino-acid receptor agonist glutamate to the rat temporomandibular joint (TMJ) region evokes similar changes in jaw-muscle activity, suggesting that peripheral application of glutamate may be nociceptive. Application of mustard oil to the TMJ region is also inflammatory, but, it is not clear if application of glutamate is equally inflammatory. In this study the extent of plasma-protein extravasation and oedema induced by mustard oil application to the TMJ region was compared with that induced by glutamate. Application of mustard oil resulted in plasma-protein extravasation into the TMJ tissues and oedema of the TMJ region. In contrast, glutamate did not cause plasma-protein extravasation or oedema.     

微量元素在化妆品中的应用

本文对七种常应用于化妆品中的微量元素的功能、作用机理、研究现状作了较为详细的讨论。     

过期妊娠104例临床分析

本文对104例过期妊娠与同期2571例足月妊娠的并发症及分娩方式进行了比较分析,结果表明:过期妊娠中头盆不称、胎位异常、胎儿宫内窘迫、巨大儿等发生率明显高于足月妊娠,且剖宫产率也较高,故认为适时终止妊娠对减少过期妊娠的发生至关重要。     

滋肾止血片对实验性IgA肾病大鼠肾组织TGF-β基因表达的影响

采用口服牛血清白蛋白(BSA)和葡萄球菌肠毒素B(SEB)感染的复合法诱发大鼠的IgA肾病(IgAN)模型,并运用时振声教授治疗肾炎的有效方剂滋肾止血片对该模型肾组织转化生长因子β(TGF-β)基因表达进行研究,提示该药对IgAN大鼠肾组织TGF-β的mRNA表达有抑制作用。     

鼻咽癌中与已知基因同源的差异表达cDNA序列

采用新近发展的ｃＤＮＡ代表性差异分析法筛选鼻咽癌中不表达的或表达降低的ｃＤＮＡ序列。结果显示：有９个与已知基因高度同源的ｃＤＮＡ序列。通过对这些已知基因的结构和功能分析,发现有与细胞骨架成分相关的基因：αａｃｔｉｎｉｎ,ｅｚｒｉｎ和细胞角蛋白１３;直接与瘤基因和抑瘤基因相互作用的基因：鲨烯合成酶和ＴＲＩＰ１基因;直接参与ＤＮＡ合成以及调控基因转录和翻译的基因：ＴＡＦⅡ６８和组蛋白Ｈ１０;另外还有人类补体因子Ｂ及类转运ＲＮＡ合成酶的基因。这些基因大多具有相当于抑瘤基因的功能。从而进一步说明鼻咽癌的发生是多基因相互作用的结果。     

类风湿性关节炎患者血清IL-6、TNF水平变化及其意义探讨

采用细胞生物学方法测定类风湿性关节炎（ Ｒ Ａ）１４ 例血清 Ｉ Ｌ－ ６ 、 Ｔ Ｎ Ｆ 水平,均显著高于正常对照组（ Ｐ＜ ０ ．００１） 。相关分析显示 Ｉ Ｌ－ ６ 与 Ｔ Ｎ Ｆ 水平变化呈正相关（ Ｐ＜ ０ ．０１） , Ｉ Ｌ－ ６ 、 Ｔ Ｎ Ｆ 与血沉亦呈正相关（ Ｐ＜０ ．０５） 。认为, Ｉ Ｌ－ ６ 、 Ｔ Ｎ Ｆ 参与 Ｒ Ａ 的发病,两者在致病中有协同相同;其水平变化与 Ｒ Ａ 的活动性及血沉相关。     

颈椎椎间盘与后部结构断层解剖及影像学研究

选用43具青年尸体,蛛网膜下腔注入铸型造影剂,低温冷冻,以椎间盘为中心制作断层标本,同时选取40例正常健康人进行超声、CT及MR扫描图像分析.发现同组中不同椎间盘水平测量数据的大小不同;解剖学与影像学各测量结果进行比较无显著性差异.     

Gender differences in motion sickness history and susceptibility to optokinetic rotation-induced motion sickness

PURPOSE: The present study investigated gender differences in motion sickness history and susceptibility to optokinetic rotation-induced motion sickness. METHODS AND RESULTS: The study included two phases. In Phase 1, 485 subjects filled out a survey of previous incidence of motion sickness. Results indicated that women reported significantly greater incidence of feeling motion sickness than did men on buses, on trains, on planes, in cars, and on amusement rides before the age of 12 yr; and on buses, on trains, on planes, in boats, on ships, in cars, on amusement rides, and on swings between the ages of 12 and 25 yr. Women also reported significantly higher incidence of being actually sick than did men on buses before the age of 12 yr and on buses, on ships, and in cars between the ages of 12 and 25 yr. In Phase 2, each of the 47 subjects viewed an optokinetic rotating-drum for 16 min. Subjects' subjective symptoms of motion sickness (SSMS) were obtained during drum rotation. The results showed that there were no significant differences on SSMS scores between men and women. CONCLUSION: Although women reported greater incidence in motion sickness history, women did not differ from men in severity of symptoms of motion sickness while viewing a rotating optokinetic drum.