The intramolecular [3+2] cycloaddition (32CA) of alkene-tethered α-silyloxydiazoalkanes provides variable stereoselectivity in generating bicyclic pyrazolines where the silyloxy group is either syn or anti to the newly formed pyrazoline ring. To elucidate the origin of the stereoselectivity, density functional theory (DFT) calculations were carried out for the energy of each transition state st...

Non-covalent interactions are the main forces involved in the recognition, transport and regulation of virtually all events in biological systems [1]. Although the chemical relevance of anionic molecules is very defined, the chemistry of anion receptors is still a growing area [2]. Host molecules which can interact with anionic species through non-covalent interactions have some advantages due ...

Mitochondrial oxidative phosphorylation has a central role in eukaryotic metabolism, providing the energy (ATP) required for survival. Regulation of this important pathway is, however, still not understood, largely due to limitations in the ability to measure the essential metabolites, including oxygen (pO2, oxygen pressure), ADP, and AMP. In addition, neither the mechanism of oxygen reduction ...

Phase shift versus control voltage for bridged-tee phase modulator {f—7}250 he). work during modulation is not generally serious, since the input reactance of the network decreases to only — j4:Xc/S ohms when R2 becomes zero. Another application of the bridged-tee of figure 3 is suggested by the previously mentioned property of this network of giving constant attenuation with variation in frequ...