目的:探讨应用电化学测菌法检测牙龈卟啉单胞菌的可行性。方法:应用电化学阻抗谱方法测量去离子水溶液中特定细菌(牙龈卟啉单胞菌)的电化学阻抗,获得针对特定细菌的敏感阻抗谱,建立特定频率下细菌浓度与系统交流阻抗值之间的函数关系,...目的:探讨应用电化学测菌法检测牙龈卟啉单胞菌的可行性。方法:应用电化学阻抗谱方法测量去离子水溶液中特定细菌(牙龈卟啉单胞菌)的电化学阻抗,获得针对特定细菌的敏感阻抗谱,建立特定频率下细菌浓度与系统交流阻抗值之间的函数关系,依据函数关系和测得的电化学阻抗值分析待检样品内特定细菌的浓度。结果:当频率低于104Hz时,系统的交流阻抗值随去离子水溶液中牙龈卟啉单胞菌浓度的增加而减小;当设定频率为1.2 kHz、待测细菌(牙龈卟啉单胞菌)浓度为103～109/mL时,牙龈卟啉单胞菌浓度C的对数与系统阻抗值Z呈良好的线性关系(R2=0.98),logC(细胞数/mL)=-0.007 Z(kΩ)+10.792;单一浓度检测用时约40 m in。结论:基于电化学阻抗原理的电化学测菌法有可能成为简便、快速检测牙周致病菌的新方法。展开更多
Based on the first invariant of stress singular field in the vicinity of running tip of an interface crack, mapping equations of the caustic curve on the reference plane and the initial curve on the specimen plane are...Based on the first invariant of stress singular field in the vicinity of running tip of an interface crack, mapping equations of the caustic curve on the reference plane and the initial curve on the specimen plane are developed. The dynamic caustics are analyzed for the crack propagating along the interface between two bonded dissimilar materials. The variation of the caustic configurations is shown with the velocity change of the running crack and the ratio change of the stress intensity factors. Two characteristic dimensions are proposed that are not only practically measurable from optical caustic contours but also suitable to represent the behavior of transient caustics.展开更多
文摘目的:探讨应用电化学测菌法检测牙龈卟啉单胞菌的可行性。方法:应用电化学阻抗谱方法测量去离子水溶液中特定细菌(牙龈卟啉单胞菌)的电化学阻抗,获得针对特定细菌的敏感阻抗谱,建立特定频率下细菌浓度与系统交流阻抗值之间的函数关系,依据函数关系和测得的电化学阻抗值分析待检样品内特定细菌的浓度。结果:当频率低于104Hz时,系统的交流阻抗值随去离子水溶液中牙龈卟啉单胞菌浓度的增加而减小;当设定频率为1.2 kHz、待测细菌(牙龈卟啉单胞菌)浓度为103～109/mL时,牙龈卟啉单胞菌浓度C的对数与系统阻抗值Z呈良好的线性关系(R2=0.98),logC(细胞数/mL)=-0.007 Z(kΩ)+10.792;单一浓度检测用时约40 m in。结论:基于电化学阻抗原理的电化学测菌法有可能成为简便、快速检测牙周致病菌的新方法。
基金The project supported by the National Natural Science Foundation of Chinathe Scientific Commission of Yunnan Province of China
文摘Based on the first invariant of stress singular field in the vicinity of running tip of an interface crack, mapping equations of the caustic curve on the reference plane and the initial curve on the specimen plane are developed. The dynamic caustics are analyzed for the crack propagating along the interface between two bonded dissimilar materials. The variation of the caustic configurations is shown with the velocity change of the running crack and the ratio change of the stress intensity factors. Two characteristic dimensions are proposed that are not only practically measurable from optical caustic contours but also suitable to represent the behavior of transient caustics.
