槲皮素对培养人视网膜色素上皮细胞增生及DNA合成的影响

目的研究槲皮素(quercetin, QUE)对培养人视网膜色素上皮(retinal pigment epithelium, RPE)细胞增生和DNA合成以及对表皮生长因子(epidermal growth factor, EGF)促RPE细胞增生和DNA合成作用的影响。方法用细胞计数和3H-胸腺嘧啶核苷(3H-thymidine, 3H-TdR)掺入方法,观察不同浓度(200、100、50、1μmol/L)的QUE和最大浓度的QUE(200μmol/L)在不同作用时间（24-168小时）,分别单独或与EGF共同作用时,对RPE细胞增生及DNA合成的影响,排除着色的死细胞,用活细胞计数法判断药物的细胞毒性作用。结果QUE 200μmol/L具有最强的抑制效应,48小时时抑制效应已明显出现,96小时时抑制达到高峰。与QUE单独作用相比,QUE对EGF的促RPE细胞增生效应能产生更强的抑制。QUE无细胞毒性作用,各实验组细胞活力均在85.00%以上。结论QUE以剂量依赖和时间依赖的方式抑制RPE细胞的增生,尤其是由EGF刺激的增生,并且对培养的RPE细胞无细胞毒作用。(中华眼底病杂志,1999,15:27-29)     

Time of day effects on sympathoadrenal and pressor reactivity to exercise in healthy men

Summary To investigate the influence of time of day on sympathoadrenal and pressor reactivity during exercise, eight trained men [age, mean (SD), 24 (0.5) years; maximal oxygen uptake ( ), 4.7 l·min^–1] performed bouts of static (ST) and dynamic (DYN) exercise at 0600–0800 hours (AM) and at 1600–1800 hours (PM). The ST protocol utilized a two-leg isometric contraction at 30% maximum voluntary contraction until failure, and was monitored by a strain gauge interfaced from a leg extension apparatus to a computer. Heart rate (f_c) and blood pressure ( ) responses were recorded at rest, after 1 and 2 min of exercise, and at failure. Epinephrine (EPI) and norepinephrine (NE) levels were recorded before exercise, and after 2 min of exercise. The DYN exercise protocol involved stationary. cycling for consecutive 6-min periods at 60% and 80% . f_c, , EPI, and NE were recorded before exercise and at each workload. No differences were observed in preexercise or exercise f_c under any condition. Preexercise did not differ under any condition. The response to DYN was significantly higher at 80% during PM only. was significantly higher in ST-PM at 1 min, 2 min, and failure. Elevations in both systolic and diastolic P _a contributed to this difference. Preexercise EPI-ST-AM was significantly elevated vs PM, but no other preexercise data were significantly different. Absolute exercise levels were significantly higher for EPIST-PM vs AM only, but the percentage change from baseline was significantly (P<0.01) higher in ST-PM for EPI (+231% PM vs + 32% AM) and NE (+352% PM vs +216% AM). The EPI and NE responses to DYN exercise tended to be higher in AM, but were not significantly different. These data support a time of day pattern in sympathoadrenal and pressor reactivity to exercise that is dependent on the type of activity involved but independent of baseline patterns.     

The differential effects of haloperidol and methamphetamine on time estimation in the rat

Forty rats were trained to make a left lever response if a signal (white noise) was 2.5s and to make a right lever response if the signal was 6.3s. When seven intermediate signal durations, to which responses were not reinforced, were randomly interspersed the probability of a right-lever (long) response increased as a function of signal duration. Methamphetamine shifted this psychometric function leftward and decreased its slope: haloperidol also decreased the slope but shifted the function rightward. A combination of haloperidol and methamphetamine led to a function similar to the saline control function. The leftward shift probably reflects an increase in the speed of an internal clock, and the rightward shift probably reflects a decrease in its speed. Since methamphetamine releases several catecholamines, including dopamine, and haloperidol blocks dopamine receptors, it is plausible that the horizontal location of the psychometric function (the speed of the clock) is related to the effective level of dopamine.     

丙二胺的拆分及右雷佐生的合成

目的 通过对一系列合成方法的研究，合成得到右雷佐生。方法 以1，2—丙二胺为原料，通过拆分、烷基化、环合等反应，完善了合成工艺。结果与结论 以左旋酒石酸为拆分剂，对消旋1，2-丙二胺进行拆分，得到其右旋异构体，在将1，2-丙二胺双酒石酸盐转变成盐酸盐的过程中，对文献方法进行了改进，简化了操作，合成路线具有实际应用价值。     

针刺留针时间与疗效关系的观察

目的:研究针刺治疗单纯性面神经麻痹中留针时间长短与疗效的关系.方法:将单纯性面神经麻痹患者60例随机分为两组,每组各30例,观察组针刺得气后留针10分钟,对照组得气后留针40分钟,每日1次,30天后统计疗效.结果:观察组痊愈率为90.0%,对照组为26.7%,统计学处理差异有非常显著性意义(P＜0.01);观察组平均治疗时间为11.8天,对照组为18.9天,差异有非常显著性意义(P＜0.01),观察组明显优于对照组.结论:治疗单纯性面神经麻痹,短时间留针比长时间留针疗效要好.     

高分辨率CT上非小细胞肺癌结节周围肺组织和血管改变的研究

目的 应用高分辨率CT(HRCT)对非小细胞肺癌(NSCLC)结节周围组织、血管的改变进行研究，总结NSCLC的特征性改变，提高HRCT对NSCLC上的诊断率。方法 应用HRCT观察31例NSCLC和12例肺部良性病变周围组织、血管的形态改变，由两位放射学家分别阅片，观察肺小叶血管支气管束、血管和叶间隔的改变。统计学处理应用x^2检验。结果 31例NSCLC患者中，20例(64．5％)出现肺小叶支气管血管柬增厚，15例(48．4％)上级肺小叶动脉扩张，13例(41．9％)上级肺小叶静脉扩张，16例(51．6％)叶间隔增厚，5例(16．1％)磨玻璃样变。对照组中肺小叶支气管血管柬增厚者2例(16．7％)，上级肺小叶动脉扩张1例(8．3％)，上级肺小叶静脉扩张2例(16．7％)，叶间隔增厚6例(50．0％)，5例(41．7％)磨玻璃样变。NSCLC上患者的肺小叶支气管血管束增厚和上级肺小叶动脉扩张的出现率均高于对照组(P＜0.005和0.01＜P＜0.025)。结论 肺部结节伴肺小叶支气管血管束增厚或上级肺小叶动脉扩张时可高度怀疑NSCLC。     

不同灸治时程对阳虚小鼠免疫功能影响的比较

本采用不同灸治时程（５分钟，１５分钟，２５分钟）治疗阳虚小鼠模型，结果显示：不同灸治时程对阳虚小鼠模型的Ｔ淋巴细胞酯酶阳性率，白细胞介素Ⅱ的影响存在的差异，灸１５分钟可显提高阳虚小鼠Ｔ淋巴细胞酯酶阳性率（Ｐ〈０．０１），灸５分钟，２５分钟则无显作用，灸１５分钟和２５分钟均可显提高阳虚小鼠白细胞介素Ⅱ的活性，二之间无显性差异，灸５分钟无此显作用，提示在改善阳虚小鼠免疫功能有作用上，以灸     

CT图像中噪声产生机理与维修

本文重点阐述和分析了CT图像中的几种噪声产生的原因和对图像的影响,并结合笔者多年的维修经验,从理论和实际相结合,介绍了几种实用的维修方法,提出了减小噪声提高图像质量的有效措施。     

系统性红斑狼疮肺部病变高分辨率CT分析

为评价高分辨率 CT( HRCT)对系统性红斑狼疮 ( SLE)患者肺、胸膜病变诊断的价值 ,对 62例 SL E患者的胸部进行HRCT扫描 ,并与普通 X线平片进行了对比。结果发现 ,HRCT对 SLE患者肺、胸膜病变较普通 X线具有更高的灵敏性 ,能早期发现肺、胸膜的细微病变     

工作场所空气中奥克托今高效液相色谱测定方法研究

目的：建立工作场所空气中奥克托今的高效液相色谱测定方法。方法：按照《工作场所空气中毒物检测方法的研制规范》的要求，进行实验室试验和验证试验及现场应用试验。结果：方法的检测限为0．81μg／ml（进样10μl洗脱液），最低检出浓度为0．017mg／m^3（以采集240L空气样品计）。当HMX含量为0—200．0μg／ml时，标准曲线线性关系良好。相关系数r=0．9999．高、中、低3个浓度的样品，6次重复测定，相对标准偏差为0．12％，1．30％，洗脱效率为94．88％～104．75％，方法的回收率为94．27％～102．05％，样品在室温至少可保存14d，奥克托今浓度为0．12，39，82mg／m^3，采样效率为91．20％～100．00％，工作场所空气中与奥克托今共存的三硝基甲苯、黑索今、二硝基甲苯，对奥克托今测定无干扰。结论：本方法各项指标达到《工作场所空气中毒物检测方法的研制规范》的要求，适用于工作场所空气中奥克托今的现场监测及样品纯度的检测。