Effect of pore size on the calculated pressure at biological cells pore wall.
A transient nonlinear finite-element program has been used to calculate the electric field distribution as a function of time for a spherical cell with a pore in a conducting medium during application of a subnanosecond rise time "step" wave, including the effects of dipolar saturation in the water-based cytoplasm and cell medium. The time-dependent pressure on the pore wall has been computed as a function of time as the system polarizes from the change of the energy in the electric field to the left (inside the pore) and to the right (inside the membrane) of the pore wall. The computations suggest that dipolar saturation, while significant, has little effect on the time-dependent electric field distribution but a substantial effect on the field-induced pore wall pressure. Also, the effect of pore size on both the computed electric field and field-induced pressure was studied. As the pore size increases, a collapse in both the electric field and field-induced pressure has been noticed. This suggests that as the pore size increases, the driving force for further opening the pore is not electrical.
El-Hag
Ayman H
AH
Electrical Engineering Department, American University of Sharjah, Sharjah, United Arab Emirate. ahalhaj@engmail.uwaterloo.ca
Zheng
Zhong
Z
Boggs
Steven A
SA
Jayaram
Shesha H
SH
D002462:Cell Membrane / Q000502:physiology* / Q000528:radiation effects; D002463:Cell Membrane Permeability / Q000502:physiology* / Q000528:radiation effects; D003198:Computer Simulation; D004307:Dose-Response Relationship, Radiation; D004553:Electric Conductivity; D004574:Electromagnetic Fields; D018274:Electroporation / Q000379:methods*; D020342:Finite Element Analysis; D008564:Membrane Potentials / Q000187:drug effects / Q000502:physiology*; D008954:Models, Biological; D016062:Porosity; D011312:Pressure; D011829:Radiation Dosage