钙拮抗剂TMB-8抑制BHQ,NE和KCl引起的培养乳牛基底动脉单个平滑肌细胞内游离钙的升高

用AR CM MIC阳离子测定系统,测量单个细胞内游离钙浓度([Ca²⁺]i),研究8-(N,N-二乙胺)-n-辛基 3,4,5-三甲氧基苯甲酸酯(TMB-8)对培养乳牛基底动脉平滑肌[Ca²⁺]i的作用。在细胞外钙浓度为1.3mmol·L^-1时,TMB-8(30μmol·L^-1)可明显抑制BHQ,NE及KCl引起[Ca²⁺]i的升高。在细胞外钙为零+EGTA 0.1mmol·L^-1时,TMB-8(10,30及100μmol·L^-1)可浓度依赖性地降低静息[Ca²⁺]i,TMB-8(30μmol·L^-1)可几乎完全阻断BHQ及NE引起[Ca²⁺]i的增加。研究表明TMB-8降低培养乳牛基底动脉平滑肌[Ca²⁺]i的机制,主要是抑制肌浆网Ca²⁺的释放,或增加肌浆网对Ca²⁺的摄入,并由此间接地抑制细胞外钙的内流。     

Cardiokymograph system with a capacitance transducer and its preliminary application in the measurement of heart wall movement

A novel cardiokymograph system is introduced. The new system features a capacitance transducer with increased sensitivity and can be used in multichannel measurements. The novelty of this technique is the injection of a current into the patient coupled with the use of a capacitive displacement transducer and the possibility of multichannel monitoring. It provides for the possibility of removing breath noise when some signal processing technique, such as adaptive filtering, is used. Further investigation is needed to demonstrate clinical significance and pathologies.     

麦冬类中药组织切片计算机三维重建图鉴

利用计算机技术实现麦冬类中药组织连续切片三维重建与动态显示,为计算机辅助生药学鉴定和教学提供了新的三维图像技术和研究资料。     

颅脑转移瘤的CT和MRI研究

134例颅脑转移瘤,CT增强薄层扫描88例,其中延迟扫描58例;薄层MRI 44例。114例(85％)有幕上转移,38例(28％)有幕下转移。73例(54％)多发,64例(46％)单发。增强MRI显示清晰和尚清晰者为42例(95％),增强后1～3min CT延迟扫描显示清晰和尚清晰者为55例(95％),延迟3min以上显示清晰和尚清晰为95％。可见,增强CT延迟扫描和大剂量增强CT对颅脑转移瘤的检出效果与增强MRI是相仿的。     

A preliminary study of the changes in the direct-acting mutagenicities of several nitropolycyclic aromatic hydrocarbons after exposure under sunlight

Five commercially available nitropolyclyclic aromatic hydrocarbons (nitro-PAH), namely, 4-nitrobiphenyl, 2-nitrofluorene, 9-nitroanthracene, 1-nitropyrene, and 2,7-dinitrofluorene, were exposed under restricted sunlight in the open air. The direct-acting mutagenicities of the samples after an exposure of 45 days were measured in order to compare them with those of the original samples in the Ames Salmonella typhimurium bioassay. It was found that the mutagenicities of some nitro-PAH do not change significantly while the mutagenicities of others increase or decrease after exposure. A preliminary study of nitro-PAH reaction products after exposure using GC, GC/MS, and FT-IR is also reported.     

中枢γ—氨基丁酸对大鼠烫伤早期心血管功能的影响

目的：通过阻断烫伤早期大鼠中枢和下丘脑室旁核γ－氨基丁酸的作用，观察大鼠心血管指标和存活时间的改变。方法：制备大鼠３０％总体表面积Ⅲ度烫伤模型；借助脑立体定向仪行中枢内注射；运用四导生理仪记录血压和心肌力学指标。结果：烫伤早期大鼠中枢和下丘脑室旁核γ－氨基丁酸作用的阻断可明显回升其血压、左心室收缩压、左心室内压最大变化速率和延长存活时间。结论：提示中枢γ－氨基丁酸对大鼠烫伤早期心血管功能有影响，部