1996
DOI: 10.1016/s0006-3495(96)79251-2
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Dielectric spectroscopy of single human erythrocytes at physiological ionic strength: dispersion of the cytoplasm

Abstract: Usually dielectrophoretic and electrorotation measurements are carried out at low ionic strength to reduce electrolysis and heat production. Such problems are minimized in microelectrode chambers. In a planar ultramicroelectrode chamber fabricated by semiconductor technology, we were able to measure the dielectric properties of human red blood cells in the frequency range from 2 kHz to 200 MHz up to physiological ion concentrations. At low ionic strength, red cells exhibit a typical electrorotation spectrum wi… Show more

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Cited by 192 publications
(192 citation statements)
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“…Those six experimental crossover frequencies Table I), and thus it is not surprised that negative (physically incorrect) values of G m were predicted using those assumptions. However, the results based on Level 2 assumption do agree fairly with the experimental findings of Gimsa et al, 28 C m ¼ 9:97 mF=m 2 , G m ¼ 480 S=m 2 , r i ¼ 0:4 À 0:535 S=m, and e m =e 0 ¼ 212À50.…”
Section: Resultssupporting
confidence: 89%
See 1 more Smart Citation
“…Those six experimental crossover frequencies Table I), and thus it is not surprised that negative (physically incorrect) values of G m were predicted using those assumptions. However, the results based on Level 2 assumption do agree fairly with the experimental findings of Gimsa et al, 28 C m ¼ 9:97 mF=m 2 , G m ¼ 480 S=m 2 , r i ¼ 0:4 À 0:535 S=m, and e m =e 0 ¼ 212À50.…”
Section: Resultssupporting
confidence: 89%
“…(1a) and (1b) if e m ) e i d=R ð Þ and r m ( r i d=R ð Þ are satisfied. For human erythrocytes based on Gimsa et al, 28 e m =e 0 ¼ 8:445, r m ¼ 3:6 Â 10 À6 S=m, r i % 0:4À0:535 S=m (from low to high frequency), e i =e 0 % 212À50 (from low to high frequency), and d=R % 1:91 Â 10 À3 (using an equilibrium radius 2.62 lm and d ¼ 5 nm). Other mammalian cells in the literature have values of similar orders.…”
Section: -5mentioning
confidence: 99%
“…A variety of chambers with different electrode configurations and correction factors for the field strength are available in the literature [16,[34][35][36][37][38], and it is well established that the most homogeneous fields are generated by circular electrodes [16]. Since we are interested in the interaction of particles with the highly nonuniform fields typically produced by electrodes with rectangular corners, in this work we use the planar four-electrode configuration placed on the base of the chamber shown in Fig.…”
Section: A Electrorotation Chambermentioning
confidence: 99%
“…In the case of water/organics mixtures, polar and charged organic molecules can contribute the TSDC spectra [24]. Notice that different electrophysical methods are frequently used to study RBCs [26][27][28][29].…”
Section: Tablementioning
confidence: 99%