Erratum to: PDMS-film coated on PCB for AC impedance sensing of biological cells

Erratum to: Biomed Microdevices

DOI 10.1007/s10544-014-9872-2

The above authors want to cite the paper of (Emaminejad et al. 2012) again right before equation (2) and (3). The corrected section is shown below:

ΔR, of the microchannel results in a modulation of the alternating electric current, ΔI, which can be expressed as (Emaminejad et al. 2012)

$$ \frac{\varDelta I}{\varDelta R}\approx \frac{dI}{dR}=\frac{dI}{dZ}\cdot \frac{dZ}{dR}=-\frac{1}{R^2}\cdot {\left(\frac{j\omega}{j\omega +\frac{2}{R{ C}_s}}\right)}^2\cdot {V}_{in} $$

(2)

$$ \left|\varDelta I\right|\approx \frac{\varDelta R}{R^2}\cdot \left[\frac{\omega^2}{\omega^2+{\left(\frac{2}{R{ C}_s}\right)}^2}\right]\cdot {V}_{in} $$

(3)