Controlling activation site density by low-energy far-field stimulation in cardiac tissue
Brief Summary: ''... The activation site density depending on the applied electric field through in vitro experiments carried out on neonatal rat cardiac tissue cultures and numerical bidomain simulations is investigated. The results indicate that the activation site density increases exponentially as a function of the intracellular conductivity and the level of cell isotropy. Additionally an intuitive analytical framework that describes the activation site density is derived that provides useful information for determining the ratio of longitudinal to transverse conductivity in a cardiac tissue culture. ...''
E ring dust sources: Implications from Cassinis's dust measurements
F. Spahn, N. Albers, M. Hörning, S. Kempf, A.V. Krivov, M. Makuch, J. Schmidt, und M. Seiß
Planetary and Space Science, 54, 9-10, 1024-1032, 2006 - doi : 10.1016/j.pss.2006.05.022
Brief Summary: ''... The impact-generated dust contributions of the other E ring satellites is estimated and significant differences in the dust ejection efficiency by two projectile families—the E ring particles (ERPs) and the interplanetary dust particles (IDPs) is found. Together with the Enceladus south-pole source, the ERP impacts play a crucial role in the inner region, whereas the IDP impacts dominate the particle production in the outer E ring, possibly accounting for its large radial extent. ...''