A benzopyrylium dye as a novel effective cationic uncoupler of oxidative phosphorylation

AbstractBenzopyrylium dye BDBP was found to be an effective uncoupler of oxidative phosphorylation. It stimulates state 4 respiration of mitochondria 2-fold at about 2 μM, reveals a maximum stimulation (8-fold) at 30 μM and inhibits the respiration at higher concentrations. BDBP is also an effective proton (hydroxyl) carrier through bilayer lipid membranes (BLM) as is seen from the electrical properties of BLM with BDBP. Picrate enhances the effects of BDBP on the mitochondrial respiration and BLM conductance. The BDBP activities are accounted for by formation of dimers and complexes with picrate

Mean-field theory of temperature cycling experiments in spin-glasses

We study analytically the effect of temperature cyclings in mean-field spin-glasses. In accordance with real experiments, we obtain a strong reinitialization of the dynamics on decreasing the temperature combined with memory effects when the original high temperature is restored. The same calculation applied to mean-field models of structural glasses shows no such reinitialization, again in accordance with experiments. In this context, we derive some relations between experimentally accessible quantities and propose new experimental protocols. Finally, we briefly discuss the effect of field cyclings during isothermal aging.Comment: Some misprints corrected, references updated, final version to apper in PR

Slow dynamics and aging in spin-glasses

Contribution presented by Eric Vincent in the Conference `Complex Behaviour of Glassy Systems', Sitges, Barcelona, Spain, June, 1996. It contains a review of the experimental results on Slow dynamics and aging in spin-glasses. It also presents their comparison with recent theoretical developments in the description of the out of equilibrium dynamics of disordered systems; namely, the trap model and the mean-field theory.Comment: 35 pages, 12 figures, macro lmamult.sty (included

Strong Electronic and Counterion Effects on Geminal Digold Formation and Reactivity as Revealed by Gold(I)-Aryl Model Complexes

Die geminale Diaurierung von [Ph3PAu(Aryl)]‐Komplexen wurde als Modell untersucht, um Einblick in die intermediäre Bildung von geminalen diaurierten Gold(I)‐Vinylkomplexen in der Katalyse zu gewinnen (siehe Schema). Die Ergebnisse tragen zum Verständnis der Faktoren bei, die die Stabilität, Reaktivität und Dynamik dieser metallorganischen Zwischenstufen bestimmen