A microelectrode array（MEA） is presented, which is composed of 60 independent electrodes with 59 working ones and one reference one, and they are divided into 30 pairs. Except for the reference electrode, each pair ...A microelectrode array（MEA） is presented, which is composed of 60 independent electrodes with 59 working ones and one reference one, and they are divided into 30 pairs. Except for the reference electrode, each pair consists of one stimulating electrode and one recording electrode. Supported by the peripheral circuits, four electrode states to study the bioelectrical signal of biological tissue or slice cultured in-vitro on the surface of the electrodes can be realized through each pair of electrodes. The four electrode states are stimulation, recording, stimulation and recording simultaneously, and isolation. The state of each pair of working electrodes can be arbitrarily controlled according to actual needs. The MEAs are fabricated in printed circuit board （PCB） technology. The total area of the PCB-based MEA is 49 mm × 49 mm. The impedance measurement of MEA is carried out in 0.9% sodium chloride solution at room temperature by means of 2-point measurements with an Agilent LCR meter, and the test signal for the impedance measurement is sinusoidal （AC voltage 50 mV, sweeping frequency 20 Hz to 10 kHz）. The electrode impedance is between 200 and 3 kΩ while the frequency is between 500 and 1 000 Hz. The electrode impedance magnitude is inversely proportional to the frequency. Experiments of toad sciatic nerve in-vitro stimulation and recording and signal regeneration between isolated toad sciatic nerves are carried out on the PCB-based MEA. The results show that the MEA can be used for bioelectrical signal stimulation, recording, stimulation and recording simultaneously, and isolation of biological tissues or slices in-vitro.展开更多
目的:应用电生理方法观察盐酸川芎嗪注射液对蟾蜍离体坐骨神经干电生理特性的影响。方法:将制备好的神经干置于标准任氏液中浸泡20min(作为对照组)后;随机再分3个实验组,即川芎嗪5mg、10mg和15mg浸泡组,各组又分别浸泡5、10、15、20、25...目的:应用电生理方法观察盐酸川芎嗪注射液对蟾蜍离体坐骨神经干电生理特性的影响。方法:将制备好的神经干置于标准任氏液中浸泡20min(作为对照组)后;随机再分3个实验组,即川芎嗪5mg、10mg和15mg浸泡组,各组又分别浸泡5、10、15、20、25、30 min 6个时间点。用BL-420E+生物机能实验系统测定各组各浸泡时间点神经干动作电位的阈强度、最适强度和不应期等电生理指标。结果:经不同浓度盐酸川芎嗪液处理后,引起神经干动作电位的阈强度和最适强度增大,不应期延长,与浸泡前(对照组)相比,差异极其显著(P<0.01)。3组浓度间比较:随川芎嗪液浓度增高对神经干电生理指标影响越明显(P<0.05,P<0.01)。经任氏液重新浸泡,消失的动作电位仍可恢复。结论:盐酸川芎嗪注射液能降低蟾蜍坐骨神经干的兴奋性,可逆性阻滞动作电位的产生。展开更多
基金The National Natural Science Foundation of China(No. 61076118, 90307013, 90707005)the Natural Science Foundation of Jiangsu Province (No. BK2008032)Special Foundation and Open Foundation of the State Key Laboratory of Bioelectronics of Southeast University
文摘A microelectrode array（MEA） is presented, which is composed of 60 independent electrodes with 59 working ones and one reference one, and they are divided into 30 pairs. Except for the reference electrode, each pair consists of one stimulating electrode and one recording electrode. Supported by the peripheral circuits, four electrode states to study the bioelectrical signal of biological tissue or slice cultured in-vitro on the surface of the electrodes can be realized through each pair of electrodes. The four electrode states are stimulation, recording, stimulation and recording simultaneously, and isolation. The state of each pair of working electrodes can be arbitrarily controlled according to actual needs. The MEAs are fabricated in printed circuit board （PCB） technology. The total area of the PCB-based MEA is 49 mm × 49 mm. The impedance measurement of MEA is carried out in 0.9% sodium chloride solution at room temperature by means of 2-point measurements with an Agilent LCR meter, and the test signal for the impedance measurement is sinusoidal （AC voltage 50 mV, sweeping frequency 20 Hz to 10 kHz）. The electrode impedance is between 200 and 3 kΩ while the frequency is between 500 and 1 000 Hz. The electrode impedance magnitude is inversely proportional to the frequency. Experiments of toad sciatic nerve in-vitro stimulation and recording and signal regeneration between isolated toad sciatic nerves are carried out on the PCB-based MEA. The results show that the MEA can be used for bioelectrical signal stimulation, recording, stimulation and recording simultaneously, and isolation of biological tissues or slices in-vitro.
文摘目的:应用电生理方法观察盐酸川芎嗪注射液对蟾蜍离体坐骨神经干电生理特性的影响。方法:将制备好的神经干置于标准任氏液中浸泡20min(作为对照组)后;随机再分3个实验组,即川芎嗪5mg、10mg和15mg浸泡组,各组又分别浸泡5、10、15、20、25、30 min 6个时间点。用BL-420E+生物机能实验系统测定各组各浸泡时间点神经干动作电位的阈强度、最适强度和不应期等电生理指标。结果:经不同浓度盐酸川芎嗪液处理后,引起神经干动作电位的阈强度和最适强度增大,不应期延长,与浸泡前(对照组)相比,差异极其显著(P<0.01)。3组浓度间比较:随川芎嗪液浓度增高对神经干电生理指标影响越明显(P<0.05,P<0.01)。经任氏液重新浸泡,消失的动作电位仍可恢复。结论:盐酸川芎嗪注射液能降低蟾蜍坐骨神经干的兴奋性,可逆性阻滞动作电位的产生。
