Ferroelectricity and electromechanical coupling in (1 − x)AgNbO3-xNaNbO3 solid solutions

Electromechanical coupling I. Introduction.

In skeletal muscle fibres contraction is initiated by the action potential which travels inward along the transverse tubular system and causes in some way the release of Ca from the terminal cisternae of the sarcoplasmic reticulum (SR). Ca-release is probably controlled by a potential-sensor (intram em brane charge movement) in the wall of the T-system which in a triad is about 10 20 nm apart f...

Intermediate coupling theory of electronic ferroelectricity.

We calculate the quantum phase diagram of an extended Falicov-Kimball model for one- and two-dimensional systems in the intermediate coupling regime. Even though some features of the phase diagram are obtained analytically, the main results are calculated with a constrained path Monte Carlo technique. We find that this regime is dominated by a Bose-Einstein condensation of excitons with a built...

Coupling Between Spins and Phonons Towards Ferroelectricity in Magnetoelectric Systems

Electromechanical Coupling between Skeletal and Cardiac Muscle

Skeletal myoblasts form grafts of mature muscle in injured hearts, and these grafts contract when exogenously stimulated. It is not known, however, whether cardiac muscle can form electromechanical junctions with skeletal muscle and induce its synchronous contraction. Here, we report that undifferentiated rat skeletal myoblasts expressed N-cadherin and connexin43, major adhesion and gap junctio...

Electromechanical Coupling in Tubular Muscle Fibers

The tubular fibers of the claw-closer muscle of the scorpion have a central core containing nuclei and mitochondria. The myofibrils have the shape of thin lamellae (1 micro) extending radially from the core to the surface membrane (20 micro). The thick myofilaments are organized in a hexagonal array with orbits of 10-13 thin myofilaments. The ratio of thick-to-thin filaments is 1:5. Transverse ...