苯并三氮唑和4—羧基苯并三氮唑对铜缓蚀作用

采用光电化学方法和交流阻抗方法将不同浓度的ＢＴＡ（苯并三氮唑）和４ＣＢＴＡ（４－羧基苯并三氮唑）在硼砂缓冲溶液（ｐＨ９．２）中对铜电极的缓蚀性能作了比较。发现在阳性向电位扫描中,一定农度的ＢＴＡ作用下,铜电极光响应由ｐ型转化为ｎ型,并可依此判断缓蚀剂的缓蚀性能。ｎ型光响应越大,缓蚀剂的缓蚀性能越好;而在４ＣＢＴＡ作用下,铜电极光响应保持ｐ型,然其阴极向扫描中最大光电汉变化明显,并可据此判断缓蚀剂诉     

溴化异丙托品对稳定期COPD患者肺功能及运动耐受性的影响

目的 观察不同剂量的溴化异丙托品（ＩＰＢ）短时及长期应用,对稳定期慢性阻塞性肺疾病（ＣＯＰＤ）患者的肺功能及运动耐受性的影响。方法 ３７例稳定期ＣＯＰＤ患者,随机分３组,分别吸人ＩＰＢ１６０μｇ／次、８０μｇ／次、４０μｇ／次。用药前后行肺功能及自行车功量仪极量运动负荷法运动试验测验。结果 吸入ＩＰＢ１６０μｇ／次、８０μｇ／次组与安慰剂对照组相比,通气及运动指标均明显改善（Ｐ〈０．０１、Ｐ〈０．     

Expression of the human multidrug resistance gene mdr1 in leukemic cells and its application in studying P-glycoprotein antagonists

Objective To explore the role of endothelin (ET) in the pathogenesis of exercise-induced asthma (EIA), we investigated the effects of ET(B) receptor antagonists, ET-1 (11-21)fragment and N-cis-2,6-dimethylpi-peridinocardonyl-L-γ-methylleucyl-D-1-methoxycarbonyl tryptophanyl-D-norleucine (BQ788) on broncho-constriction elicited by isocapnic hyperpnea in guinea pigs. Methods Eighteen pathogen-free Hartley guinea pigs were randomly divided into three groups. A: normal saline (NS) inhalation control group (n=6), B: BQ788 group (n=6), and C: ET-1(11-21) fragment group (n=6). Guinea pigs were anesthetized with pentobarbital sodium. After measuring the basal value of lung resistance (R[L]) and dynamic compliance of the respiratory system (Cdyn), NS (0.96 ml), BQ788 (9 nmol) and ET-1(11-21)fragment (9 nmol) were inhaled. A rodent respirator with a dry 5%CO(2)-95%O(2) mixture at room temperature provided mechanical ventilation (V[T] 8 ml/animal, 100 breaths/min) for 5 min. R[L] and Cdyn of the 3 groups were measured again after isocapnic hyperpnea challenge. Results In the control group, isocapnic hyperpnea of dry gas elicited a marked increase in R[L] and decrease in Cdyn. R[L] and Cdyn of the guinea pigs from BQ788 group and ET-1(11-21)fragment group did not change significantly. Conclusion It was demonstrated that selective ET(B) receptor antagonists, ET-1(11-21) fragment and BQ788, inhibited the bronchoconstriction induced by isocapnic hyperpnea in guinea pigs. The data showed that ETs are potent constrictors of guinea pig airway smooth muscle via a direct effect on ET receptors. It was suggested that ET receptor antagonists, especially ET(B) receptor antagonist, might be beneficial in preventing EIA.     

LDL-C直接测定法在生化分析仪上的应用

用日本第一化学药品株式会社LDL—C试剂盒在BeckmanCX4型自动生化分析仪上直接测定血清LDL—C含量。方法批内CV 0 37%～ 1 11% ,批间CV为 2 11%～ 3 0 2 % (n =2 0 )。平均回收率为 98 9% ,在 8 10mmol/L浓度范围内呈良好线性关系。TG <5 0 0mmol/L时与聚乙烯硫酸沉淀法 (X1)及Friedewald(X2 )公式计算结果相关良好 ,回归方程分别为Y =0 988X1+0 0 47,r=0 95 1,Y =0 96 1X2 +0 0 5 2 ,r=0 930。LDL—C直接测定法简单、快速 ,用血量少 ,勿需沉淀分离 ,适宜于自动化分析。     

聚氯乙烯膜盐酸奎宁选择电极的研制与应用

目的及方法 :本文首次使用鞣酸与六价铬形成的络合物为沉淀剂 ,使其与奎宁形成的分子缔合物为电活性物 ,制备了一种新型的 PVC膜盐酸奎宁选择电极。结果 :电极的 Nernst响应范围为 1.0× 10 - 1～ 1.0× 10 - 5 mol/ L;斜率为 5 3m V/ p C;检测限为 7.0× 10 - 6 mol/ L。结论 :此电极响应迅速 ,重现性好 ,用此电极以标准曲线法对药物中的盐酸奎宁进行了测定 ,操作简便 ,结果与药典法相符     

CT引导经皮肺穿刺锚状电极高温射频消融治疗肺部肿瘤105例

目的 观察ＣＴ引导经皮肺穿刺高温射频消融治疗１０５例肺部恶性肿瘤的近期效果。方法 ＣＴ引导经皮肺穿刺,可扩展锚状电极配合ＲＦ－２０００仪高温射频消融治疗原发性肺癌８１例,肺部转移瘤２４例,共计２４２个肿瘤,每个肿瘤治疗３～８次,持续时间３～３３７ｍｉｎ。结果 完全缓解（ＣＲ）率１１．１％,部分缓解（ＰＲ）率７１．１％,轻微疗效（ＭＲ）率１３．２％,无改变（ＮＣ）率４．５％,其中ＣＲ＋ＰＲ率为８２．     

Gastric Bypass Distal Roux-en-Y Jejunal Interposition with Selective Proximal Vagotomy and Posterior Truncal Vagotomy

Selective proximal vagotomy and posterior truncal vagotomy have been performed in 71 consecutive gastric bypass (GBP) patients from June 1991 to December 1992. Vagotomy was used to prevent or diminish the incidence of marginal ulcer in GBP patients. Anterior and posterior highly selective proximal vagotomy with circular-instrument stapled gastrojejunostomy in patients undergoing GBP distal Roux-en-Y with jejunal interposition had no marginal ulcer complications (minimal follow-up 18 months).     

Microelectrode measurements of the effects of basolateral adenosine in polarized human intestinal epithelial cells in culture

 Activation of the basolateral receptor for adenosine in HT-29cl.19A cells, by 100 μM adenosine, increased the equivalent short-circuit current (ΔI _sc= 24±2 μA/cm²), depolarized the intracellular potential (ΔV _a= 26±2 mV) and decreased the fractional apical membrane resistance (ΔfR _a=–0.48). The changes in all parameters reached their peak values simultaneously. This suggests that the primary action of the adenosine-activated pathway is on only one membrane. Bumetanide inhibited the transepithelial response and repolarized the cell potential. After preincubation with 100 μM forskolin, application of 300 μM adenosine caused a significant further change in V _a, I _sc, the transepithelial potential (V _t) and fR _a. Together with the results from ion-replacement studies, the observations indicate that adenosine activates channels other than the cystic fibrosis transmembrane conductance regulator (CFTR). The rank order of potencies of adenosine and adenosine analogues implies that the receptor is of the A₂ subtype. Preincubation with 4-bromophenacyl bromide (4-BPB) inhibited the effect of an adenosine analogue by 50%, indicating that activation of phospholipase A₂ may be involved in the adenosine-induced response. Received: 5 August 1998 / Received after revision: 12 October 1998 / Accepted: 5 November 1998     

胃选择性迷走神经切断对大鼠肝再生的影响——肝细胞体积、数量和DNA含量的研究

探讨胃选择性迷走神经切断对大鼠再生肝细胞体积、数量和ＤＮＡ含量的影响。分别测定大鼠胃选择性迷走神经切断加肝叶大部分切除及肝叶大部分切除术后７ ｄ 再生肝ＤＮＡ含量、肝细胞数和体积。用多功能显微图像测量仪测定切片中肝细胞和肝细胞核面积及肝细胞核直径。按体视学方法测算整个肝脏的肝细胞数。用细胞分光光度技术测定切片中单个肝细胞ＤＮＡ 含量。结果表明, 胃选择性迷走神经切断加肝叶大部分切除组大鼠肝细胞ＤＮＡ含量、数量及体积均较单纯肝叶切除组增加 （Ｐ＜ ０．０５）。提示胃选择性迷走神经切断对大鼠肝再生过程有一定的促进作用。