Jossinet Jacques
Inserm, U556, Lyon, France University of Lyon, Lyon, France.
Technol Health Care. 2008;16(6):465-74.
The paper describes the physical phenomena involved in the conduction of electricity, with particular reference to living tissue. The conduction of electricity depends on the flow of charge carriers in the material, while the dielectric properties are due to the rotation of dipoles that can align along an applied electric field. The relation between the electric variables in a conducting medium and their physical meanings are explained. The phenomena responsible for the electric and dielectric properties of living tissues are described. The presence of cells limits the flow of charge carriers, in particular at low frequency, and the membranes are responsible for dielectric relaxation. The passive response of cell membranes to weak applied signals enables bioelectrical tissue characterisation. Practical tools for electrical impedance spectroscopy are given with an overview of the most recent applications.
本文描述了与电传导相关的物理现象，尤其涉及生物组织。电传导取决于材料中电荷载流子的流动，而介电特性则归因于偶极子的旋转，这些偶极子可沿外加电场排列。文中解释了导电介质中电变量之间的关系及其物理意义。描述了导致生物组织电特性和介电特性的现象。细胞的存在限制了电荷载流子的流动，尤其是在低频时，而细胞膜则导致介电弛豫。细胞膜对微弱外加信号的被动响应使得能够对生物电组织进行表征。给出了电阻抗谱的实用工具，并概述了其最新应用。
