烟碱对大鼠心电图的影响

烟碱对心率的作用具有阶段性,初期引起心率短暂性减弱,紧接着发生瞬时增加。为进一步确定烟碱对大鼠心脏的作用,对描记烟碱作用后大鼠心电图进行分析,发现烟碱能引起大鼠心电图显示较长的QT间期,增加了PR间期及T波面积,与肾上腺素或去甲肾上腺素引起的QT间期延长相似,且能被M受体阻断剂阿托品所阻断,说明烟碱能够诱导局部释放乙酰胆碱或者作用于部分副交感神经控制的毒蕈碱受体。     

山羊A-B导联心电图初探

探索了山羊心电图新的导联方法,结果表明Ａ－Ｂ导联的Ｐ波、ＱＲＳ波群及Ｔ波均比较稳定,波形振幅大,便于分析,为描记山羊心电图的最理想导联。     

心电图技术和听性脑干反应技术在测定鱼类听觉性能上的比较

简要介绍了ECG技术、ABR技术、鱼类听觉特性及ECG技术、ABR技术在测定鱼类听觉性能上的比较。对于两种测定鱼类听觉性能的方法,分别从原理、测定方法、所用仪器、适用类型(鱼类)、优缺点方面进行比较,重点介绍了同一实验用两种方法测量所得结果分析。     

茶叶提取物EGCG和GCG及ECG对B16细胞内黑色素生成的抑制作用

为研究茶叶提取物表没食子儿茶素没食子酸酯(epigallocatechin gallate,EGCG)、没食子儿茶素没食子酸酯(gallocatechingallate,GCG)和表儿茶素没食子酸酯(epicatechingallate,ECG)对体外培养B16小鼠黑色素瘤细胞黑色素生成及酪氨酸酶活性的影响,分别用不同浓度的EGCG、GCG、ECG和熊果苷(Arbutin,AR)处理细胞,观察效应物对细胞形态的影响,用溴化二苯四偶氮法(MTT法)测定茶叶提取物对细胞增殖率的影响,以左旋多巴(L–DOPA)为底物,测定细胞内酪氨酸酶的活性,采用氢氧化钠裂解法测定细胞内黑色素的含量。结果显示,EGCG、ECG、GCG能显著抑制B16细胞的黑色素生成和酪氨酸酶的活性,且呈剂量依赖关系;当浓度为60μg/mL时,细胞增殖率均低于50%,酪氨酸酶活性与对照组相比分别降低了26.67%、27.27%和32.71%,黑色素生成抑制率均在30%以上。结果表明,茶叶提取物能通过多种途径抑制黑色素生成,且GCG的作用效果最优,ECG的作用效果次之,三者的作用效果均优于熊果苷的作用效果。     

ECG Information Management System of Virtual ECG Instrument

ECG is an important method in clinical heart disease diagnosis. The storing of lots of ECG and other corresponding materials in information management system has great value to medical researcher for their reference and research. Embedding the ECG information management system to virtual ECG instrument is not only enhanced the operating value but also increased the functions to virtual ECG instrument. The model of relation database and ActiveX Data Object (ADO) of VC++6.0 is used in the system. The key functions of Storing,Query,Deleting and core modules are introduced.     

ECG Signal Acquisition Instrument Based on USB 2.0

An electrocardiogram (ECG) is an essential way for diagnosing the heart disease, and the test theories and systems work well with the practice application, whereas, as new technologies and devices come forth one after another, it allow us to acquire the ECG data more conveniently, more accurately, more comprehensively. The authors discuss the design of ECG data acquisition system based on the USB 2.0 protocol, and expatiates the system principle in detail. The system employs two AD73360 to sample the standard 12-lead signal simultaneously, which has a resolution of 16-bit. They utilize EZ-USB FX-2 as the USB interface device, which can transfer the data conveniently and quickly, and also permit the configuration of multi-system controlled by just one host. Considering the DSP as a powerful tool in the field of digital signal processing, ADSP-2181 has been chosen.