2014 The theory of the Jahn-Teller effect is treated for the case of trigonal symmetry and strong vibronic interaction. The vibronic Hamiltonian is established assuming that the vibrational modes are any E modes whatsoever but respecting the trigonal symmetry. The trigonal potential and the vibronic interaction are diagonalized at the same time, in the basis of the cubic T1 or T2 electronic sta...

Multiple gas jet impingement cooling for quenching is a very promising approach for increasing the heat transfer coefficients (h) and thus the overall cooling rates in the gas-quenching process. Appropriate correlations for h were selected based on an extensive critical literature review, and used in a numerical heat conduction model and a numerical phase transformation model which were develop...

The study reports a set of forty proteinogenic histidine-containing dipeptides as potential carbonyl quenchers. The peptides were chosen to cover as exhaustively as possible the accessible chemical space, and their quenching activities toward 4-hydroxy-2-nonenal (HNE) and pyridoxal were evaluated by HPLC analyses. The peptides were capped at the C-terminus as methyl esters or amides to favor th...

Ophiobolin A, a fungal metabolite and a phytotoxin which can stimulate the net leakage of electrolytes and glucose from maize seedling roots (Tipton, C. L., Paulsen, P. V., and Betts, R. E. (1977) Plant Physiol. 59, 907-910) was found to be a potent inhibitor of calmodulin-activated cyclic nucleotide phosphodiesterase. The physiologically less active analogue, 3-anhydro-ophiobolin A, was found ...

The effectiveness of fluorescence quenching of pyrene-1-sulfonyl azide, a hydrophobic probe used to photo-label acetylcholine receptor (AcChR)-rich electroplax membranes [Sator, V., Gonzalez-Ros, J. M., Calvo-Fernandez, P., & Martinez-Carrion, M. (1979) Biochemistry 18, 1200], is used to study the accessibility of the covalently attached fluorophore to extramembranous quenchers as a function of...