impedance – Page 3 – TechConnect Briefs

Electronic DNA detection on semiconductor surfaces

Han Y., Tan E., Candebat D., Bandyopadhyay K., Niemz A., Keck Graduation Institute, US

Electronic biosensors offer a viable alternative to optical biosensors for the rapid, specific, and sensitive detection of DNA. We are utilizing an electrolyte-oxide-semiconductor (EOS) biosensor system on a SiO2/Si surface for impedimetric detection of DNA. [...]

Determination of relative concentrations of metallic and semi-conducting SWNTs in suspension via dielectrophoresis

Mureau N., Mendoza E., Hoettges K.F., Silva S.R.P, Hughes M.P., University of Surrey, UK

Dielectrophoresis (DEP) is a phemomenon of induced particle motion in non-uniform electric fields. The effect is frequency dependent; by monitoring the motion of particles in AC fields and ananlysing the change in motion with frequency, [...]

Bio-Impedance Sensing Device (BISD) for Detection of Human CD4+ Cells

Mishra N.N., Retterrer S., Zieziulewicz T.J., Isaacson M., Szarowski D., Mousseau D.E., Lawrence D.A., Turner J.N., New York City Department of Health, US

The aim of this work is to develop a small on-chip bio-impedance sensing device (BISD) to rapidly detect and quantify cells with a specific phenotype in a heterogenous population of cells (e.g., human CD4+ cells [...]

Detection of DNA Hybridyzation with Impedance Amplifying Labels

Ma K-S, Madou M., Zhou H., Fischetti A., Zoval J., Madou M., University of California Irvine, US

Traditionally used nucleic acid analysis detection platforms rely on fluorescent or radioactive labels. Optical techniques require large and expensive equipment such as automated colorimetric and fluorimetric instruments that greatly increase the cost of the whole [...]