RP—HPLC用于紫苏油及其习用品白苏油,野苏油的鉴别

本文采用RP－HPLC方法对紫苏油及其习用品白苏油、野苏油甘油酯进行了定性定量分析。利用HPLC分析油脂也为中药材真伪鉴别提供了一条有效途径。     

Negative inotropic effect of 3,6-dimethamidodibenzopyriodonium citrate (I-65) on guinea pig papillary muscles

The effects of 3,6-dimethamidodibenzopyriodonium citrate (I-65) on the contractile response of electrically paced guinea pig papillary muscles in vitro were studied. I-65 (0.1-300 mumol/L) decreased the contractile force and inhibited isoprenaline-induced restoration of the contractile response in papillary muscles rendered inexcitable by KCl 22 mmol/L. Both effects were concentration-dependent, and the IC50 were 36.0 and 7.3 mumol/L, respectively. I-65 antagonized the positive inotropic effects of Iso and CaCl2 in a non-competitive manner. Like verapamil, I-65 had a frequency-dependent negative inotropic effect, and delayed the recovery of post-rest potentiation. It is concluded that the negative inotropic effect of I-65 results not only from the reduction of Ca2+-influx through the sarcolemmal membrane, but also from the inhibition of Ca2+ translocation in the sarcoplasmic reticulum.     

脑梗死后抑郁与负性生活事件相关性研究

目的　探讨脑梗死后抑郁与负性生活事件的关系。方法　将脑梗死患者按是否受负性生活事件影响分为 A(n=75 )、B(n=73)两组。采用抑郁自评量表 (SDS)及 Hamilton抑郁量表筛查 ,对两组进行比较分析 ,并观察其治疗效果。结果　A、B两组脑梗死后抑郁的发生率分别为 5 6 %、38.4 % ,两者比较差异显著 (P<0 .0 5 ) ;百忧解可显著改善或治愈脑梗死后抑郁 ,总有效率 6 1.7%。结论　脑梗死后抑郁发生与负性生活事件相关。百忧解治疗有效     

3种桩核系统修复喇叭形根管的抗折性比较

目的 :比较 3种桩核系统修复喇叭形根管的牙根修复后的抗折性及其折断模式。方法 :30个完整的上颌中切牙 ,在根管治疗后 ,沿釉牙骨质界弧形顶点冠方 2mm切除牙冠 ,将根管上 1/3敞开形成喇叭形根管 ,样本随机分成 3组 :A组 ,铸造桩核金属全冠修复 ;B组 ,玻璃纤维树脂核全冠修复 ;C组 ,成品不锈钢平行螺纹桩树脂核全冠修复。样本固定于MTS810测试机上 ,与牙体长轴呈 135°加载 ,测试折断强度并观察折断模式。结果采用方差分析。结果 :铸造桩核修复抗折强度最高 [(76 3.86± 86 .38)N],其次是成品螺纹桩树脂核修复 [(6 19.91± 118.89)N],玻璃纤维树脂核组最小 [(40 5 .5 4± 111.86 )N],统计学分析差异具有显著性。结论 :铸造桩核树脂核修复后抗折强度最高 ,玻璃纤维树脂核修复最低 ,但后者折断模式最有利于重新修复 ,而前者通常无法再行修复。     

谈耳鼻喉科教学中多媒体技术的应用

多媒体教学技术应用于耳鼻喉科教学,具有直观性好、动态感强、信息量大等优点,能使教学信息直接、形象、具体、生动地展现给学生,让学生体会到学习的乐趣,是耳鼻喉科现代化教学的理想模式.     

Assessment of myocardial viability in rats: Evaluation of a new method using superparamagnetic iron oxide nanoparticles and Gd-DOTA at high magnetic field.

The aim of this study was to detect salvageable peri-infarction myocardium by MRI in rats after infarction, using with a double contrast agent (CA) protocol at 7 Tesla. Intravascular superparamagnetic iron oxide (SPIO) nanoparticles and an extracellular paramagnetic CA (Gd-DOTA) were used to characterize the peri-infarction zone, which may recover function after reperfusion occurs. Infarcted areas measured from T1-weighted (T1-w) images post Gd-DOTA administration were overestimated compared to histological TTC staining (52% +/- 3% of LV surface area vs. 40% +/- 3%, P=0.03) or to T2-w images post SPIO administration (41% +/- 4%, P=0.04), whereas areas measured from T2-w images post SPIO administration were not significantly different from those measured histologically (P=0.7). Viable and nonviable myocardium portions of ischemically injured myocardium were enhanced after diffusive Gd-DOTA injection. The subsequent injection of vascular SPIO nanoparticles enables the discrimination of viable peri-infarction regions by specifically altering the signal of the still-vascularized myocardium.     

胸部螺旋CT最大密度投影重建的参数优化

目的探讨胸部螺旋CT最大密度投影(MIP)重建合理的扫描和重建参数。方法6例煤工的尸检离体肺脏制成充气固定肺标本,分别行不同参数组合的螺旋CT扫描,包括层厚1.5mm,2mm,4mm及8mm,重建间隔1mm,3mm,5mm;曝光量150mA,100mA;螺距1.5;滤过算法包括标准、锐利和平滑3种。每组图像均行MIP重建,重建厚度为12.5mm～13mm,比较不同参数MIP重建图像对支气管血管束的显示。结果a)曝光量对MIP重建图像的影响甚微,150mA、100mA两组剂量MIP无显著性差异(P>0.05);b)重建算法对MIP重建无显著影响。c)扫描层厚影响MIP图像,以薄层(1.5mm)扫描重建为最佳,1.5mm、2mm、4mm层厚MIP图像之间无显著性差异(P>0.05),8mm层厚与前4者MIP图像有显著性差异(P<0.01)。d)重建间隔影响MIP重建效果,8mm层厚扫描,1mm和5mm重建间隔重建图像MIP之间有显著性差异(P<0.05)。结论影响MIP重建的参数主要为扫描层厚和重建间隔,薄层扫描可获得理想的MIP图像,随层厚的增加,减小重建间隔有利于获得理想的MIP图像。建议以中等层厚(4mm)扫描,小重建间隔(1.5mm,2mm)行MIP重建。     

脑膜瘤组织中Survivin和PCNA的表达

目的 探讨Survivin和PCNA在脑膜瘤组织中的表达及临床意义。方法 采用免疫组织化学sP法检测97例脑膜瘤组织和18例正常脑膜组织中Survivin和PCNA的表达。结果 Survivin在正常脑膜和脑膜瘤组织中阳性表达率为0％和65．9％（64／97），差异具有显著性（P〈0．001）。Survivln表达阳性率在脑膜瘤Ⅱ级（85．7％）和Ⅰ级（51、7％）之间、Ⅲ级（93．8％）和Ⅰ级之间差异具有显著性（P〈0．001）。PCNA蛋白在正常脑膜和脑膜瘤组织中表达阳性率为0％和55．7％（54／97），差异具有显著性（P〈0．001）。PC—NA表达阳性率在脑膜瘤Ⅱ级（71．4％）和Ⅰ级（41、7％）之间，Ⅲ级（87．5％）同Ⅰ级之间差异具有显著性（P〈0．001）。Survivin与PCNA蛋白在脑膜瘤中的表达呈正相关关系（rs=0．640，P〈0．01）。结论 Survivin过度表达和脑膜瘤发生及PCNA的表达密切相关，两者参与了脑膜瘤发生、增殖和发展。