Impedance Measurement
Impedance Measurement - Related Videos
05:15
Impedance-Based Measurements of Brain Cancer Cell Invasion
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2025
Source: Mudduluru, G., et. al. Impedance-based Real-time Measurement of Cancer Cell Migration and Invasion. J. Vis. Exp. (2020)This video demonstrates an impedance-based assay to measure glioblastoma cell invasion and migration. Cells degrade the extracellular matrix, move through microporous membranes, and adhere to electrodes, generating impedance. This real-time analysis reflects their invasive potential for cancer research applications.
03:00
Impedance-Based Cellular Assay to Measure Multiplicity of Infection of Influenza Virus
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2025
In this video, we discuss the correlation between the CIT50 and the multiplicity of viral infections. The virus-infected cells display cytopathic effects, causing their death and detachment from the gold microelectrode, which in turn, reduces the impedance.
08:59
Electrochemical Impedance Spectroscopy
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2023
Source: Kara Ingraham, Jared McCutchen, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Electrical resistance is the ability of an electrical circuit element to resist the flow of electricity. Resistance is defined by Ohm's Law: (Equation 1) Where is the voltage and is the current. Ohm's law is useful for determining the resistance of ideal resistors. However, many circuit elements are more complex and can't be described by...
05:04
Three-Chambered Array-Based Impedance Assay: A Real-Time Analysis Technique to Assess Invasive Potential of Cancer Cells by Measuring Electrical Impedance
0 Views •
2025
This video describes an invasion assay using a three-chambered array based on electrical impedance. This technique measures the invasive potential of cancer cells under the influence of soluble factors secreted by the resident stromal cells in tumor microenvironments.
08:51
A Real-time Electrical Impedance Based Technique to Measure Invasion of Endothelial Cell Monolayer by Cancer Cells
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Cited by 68 •
2011
This article describes an in vitro technique for monitoring cancer cells invading through a monolayer of endothelial cells. The data is acquired in real-time as a function of changes in impedance on the surface of electrodes at the well bottom.
FAQs
Recording across a defined frequency range separates changes in resistance from changes in reactance and phase shift. Those components can reflect different contributions from the biological system, including cell coverage, membrane behavior, and the conductivity of the surrounding solution. A frequency-dependent profile therefore provides more detailed information than a single resistance value.
Electrodes provide the electrical interface with the biological system, while a small alternating voltage supplies the measurement stimulus. The resulting current reveals how the system responds under the selected electrical conditions. Recording this response across a defined frequency range helps capture both opposition to current and phase-related behavior associated with cells, membranes, and solution conductivity.
Resistance describes opposition to current, but impedance measurement also captures reactance and phase shifts. These additional features can reveal membrane behavior and other frequency-dependent properties that a resistance-only reading may not show. In biological research, combining these electrical components supports a broader interpretation of changes in cell coverage, viability, barrier integrity, or the surrounding solution.
A typical workflow uses electrodes connected to the biological system, applies a small alternating voltage, and records the resulting current. Measurements are collected across a defined frequency range so resistance, reactance, and phase behavior can be assessed together. Repeating this process over time allows researchers to follow changes in the system without introducing fluorescent or radioactive labels.
Researchers can use the method when they need real-time information about biological changes in tissue models, drug responses, or disease-related conditions. Because the readout is label-free, experiments can monitor evolving cell or barrier behavior without relying on fluorescent or radioactive tags. The resulting electrical changes provide a way to follow responses as they develop.
Changes in the measured electrical response can be followed as cells alter their coverage or as a biological barrier changes. Time-dependent measurements therefore support studies of migration, growth, viability, and barrier integrity within a defined system. This is especially useful when the goal is to observe dynamic behavior continuously rather than rely only on a final endpoint.