The measurement of the impedance of biological tissue can be a non-invasive method to find new data of diagnostic relevance. A system for a noncontact measurement of the electrical impedance of biological tissue is presented. The system consists of an excitation coil and two sensing coils coupled together as a gradiometer. The excitation coil is driven by an alternating current. Due to this alt...

D.C. Sigg et al. (eds.), Cardiac Electrophysiology Methods and Models, DOI 10.1007/978-1-4419-6658-2_2, © Springer Science + Business Media, LLC 2010 Abstract Cardiomyocytes are excitable cells that have the ability to contract after excitation; therefore, each heartbeat is an event of electrical–mechanical coupling. Cardiac electrical activity at different levels can be measured through variab...

OBJECTIVE It has been shown that discharge of single darkness detector in the frog retina can lead to suprathreshold excitation of the tectal neurons. The present study was designed to explore whether a suprathreshold excitation of frog tectal neurons can be elicited by the discharge of single moving-edge detector. MATERIAL AND METHODS The discharge of a single retina ganglion cell was elicit...

The effect of electrical stimulation on neuronal membrane potential is frequency dependent. Low frequency electrical stimulation can evoke action potentials, whereas high frequency stimulation can inhibit action potential transmission. Optical stimulation of channelrhodopsin-2 (ChR2) expressed in neuronal membranes can also excite action potentials. However, it is unknown whether optical stimul...

the excitation of plasmonic modes in metallic gratings Changjun Min, Jennifer Li, Georgios Veronis, Jung-Yong Lee, Shanhui Fan, and Peter Peumans Center for Computation and Technology, Louisiana State University, Baton Rouge, Louisiana 70803, USA Department of Electrical and Computer Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA Department of Electrical Engineering,...

Chronic atrial fibrillation (AF) is associated with structural and electrical remodelling in the atria, which are associated with a high recurrence of AF. Through biophysically detailed computer modelling, this study investigated mechanisms by which AF-induced electrical remodelling promotes and perpetuates AF. A family of Courtemanche-Ramirez-Nattel variant models of human atrial cell action p...

In the Drosophila antennal lobe, excitation can spread between glomerular processing channels. In this study, we investigated the mechanism of lateral excitation. Dual recordings from excitatory local neurons (eLNs) and projection neurons (PNs) showed that eLN-to-PN synapses transmit both hyperpolarization and depolarization, are not diminished by blocking chemical neurotransmission, and are ab...