To accomplish this, selleck screening library we need to develop a better understanding of how ischemic damage, protection, and aging are linked. In this regard, mitochondria have emerged as a common theme. First, mitochondria contribute to cell damage during ischemia-reperfusion (IR) and are central to cell death. Second, the protective signaling pathways activated by IPC converge on mitochondria, and the opening of mitochondrial

ion channels alone is sufficient to elicit protection. Finally, mitochondria clearly influence the aging process, and specific defects in mitochondrial activity are associated with age-related functional decline. This review will summarize the effects of aging on myocardial IR injury and discuss relevant and emerging strategies to protect against MI with an emphasis on mitochondrial function. (C) 2011 Elsevier Inc. All rights reserved.”
“A single-degree-of-freedom symmetric impact oscillator between two learn more rigid stops is considered. The system is strongly nonlinear clue to the existence of impacts. The symmetric period n – 2 motion of the system is obtained analytically, and the Poincare map is established. The dynamics of the system can be investigated by studying the symmetric fixed point, because symmetric period motion corresponds

to a symmetric fixed point of the Poincare map. Because of the symmetry of the Poincare map, a symmetric fixed point of the Poincare map only has pitchfork bifurcation. The stability of the symmetric fixed point find more is determined by the eigenvalues of the Jacobian matrix of the Poincare map. For an attractor in the Poincare section, all the Lyapunov exponents can be computed via the Jacobian matrix of the Poincare map. Numerical simulations show that the symmetric period motion is stable for larger values of excitation frequency, smaller values of excitation amplitude and smaller values of mass. When the control parameter changes continuously, the symmetric fixed point loses its

stability, and generates a pair of antisymmetric period-doubling sequences via pitchfork bifurcation, which subsequently lead to symmetric chaos. The top Lyapunov exponent can be used to distinguish long periodic motion from chaotic motion. (c) 2010 Elsevier Ltd. All rights reserved.”
“Minority carrier lifetime is the most crucial material parameter for the performance of a silicon solar cell. While numerous methods exist to determine carrier lifetime on solar cell precursors prior to metallization, only very few techniques are capable of implicitly extracting effective minority carrier lifetimes from metallized silicon samples. In this paper, a measurement technique for effective minority carrier lifetime on silicon solar cells and metallized cell precursors via quasi-steady-state photoluminescence is presented.