Dielectric properties of nucleated erythrocytes as simulated by the double spherical-shell model  

作　　者：Jia Xu Weizhen Xie Yiyong Chen Lihong Wang Qing Ma 徐佳;谢伟珍;陈一勇;王立洪;马青(School of Medicine,Ningbo University,Ningbo 315211,China;School of Mathematics and Statistics,Ningbo University,Ningbo 315211,China)

机构地区：[1]School of Medicine,Ningbo University,Ningbo 315211,China [2]School of Mathematics and Statistics,Ningbo University,Ningbo 315211,China

出　　处：《Chinese Physics B》2020年第12期564-572,共9页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.51277099 and 52007087);the Natural Science Foundation of Zhejiang Province,China(Grant Nos.LY20C110001 and LSY19A010002);the Natural Science Foundation of Ningbo City,China(Grant Nos.2019A610349 and 202003N4116);the Fund from the Educational Commission of Zhejiang Province,China(Grant No.Y202044047);the Fundamental Research Funds for the Provincial Universities of Zhejiang Province,China.

摘　　要：The dielectric properties of nucleated erythrocytes from bullfrogs were measured in a frequency range of 10 kHz–110 MHz.The complex permittivity(ε*),complex conductivity(κ*),and complex resistivity(ρ*)were analyzed and compared in the 10.63%to 37.58%haematocrit(Hct)range.The relaxation behavior,the passive electrical properties,and the cellular structure parameters,including the cell membrane,the cytoplasm,the nuclear membrane,and the nucleoplasm of the nucleated erythrocyte suspensions were investigated.The method used is based on the binomial Cole–Cole equation and the double spherical-shell physical models.Upon the elimination of the electrode polarization effect,two definite relaxations related to the interfacial polarization are observed on low-and high-frequency dispersions.The permittivity values and the characteristic frequency values differ by one order of magnitude:the low-frequency relaxation increments[?ε1=(5.63±1.43)×103]and the characteristic frequency[fc1=(297.06±14.48)kHz]derived from the cell membrane,the high-frequency relaxation increments[?ε2=(5.21±1.20)×102]and the characteristic frequency[fc2=(3.73±0.06)MHz]derived from the dielectric response to the external electric field of the nuclear membrane,respectively.Moreover,the other core dielectric parameters,such as the relative permittivity of the cell membrane[εm=(7.57±0.38)]and the nuclear envelope[εne=(23.59±4.39)],the conductivity of the cytoplasm(hemoglobin,κHb=(0.50±0.13)S/m]and the nuclear endoplasm[κnp=(2.56±0.75)S/m],and the capacitance of the bilayer membranes[Cm:(0.84±0.04)μF/cm2],and Cne:(0.52±0.10)μF/cm2]were also accurately and reliably measured.This work presents a feasible method to evaluate the dielectric parameters and the cellular structure of the erythrocytes of bullfrogs.Moreover,it paves the way for new studies on the haematology of frogs and the detection of nucleated cells via dielectric impedance spectroscopy.

关 键 词：dielectric impedance spectroscopy bullfrog erythrocytes the double spherical-shell model passive electrical property 

分 类 号：R318[医药卫生—生物医学工程]