According to the conventional understanding, oxygen evolution reaction on metal oxide surfaces involves four proton-coupled electron transfer steps with *OH, *O, and *OOH intermediates. Recently, several alternative mechanisms lower overpotentials were proposed for highly active catalysts. While such additional intermediates leading nonelectrochemical could be considered, they are usually negle...

[Zn(hba)2(tmdp)]n (1), a Zn-coordination polymer (CP), prepared by the reaction of Zn(NO3)2•6H2O, 4-hydroxybenzoic acid (Hhba) and 4,4′- trimethylenedipyridine (tmdp) was reported. The compound characterised, using CHN, single crystal powder X-ray diffraction analysis, FT-IR, TGA techniques. It exhibits square pyramidal geometry, with zinc (II) atom coordinated to two nitrogen atoms from tmdp l...

The sliding tubule model of ciliary motion requires that active sliding of microtubules occur by cyclic cross-bridging of the dynein arms. When isolated, demembranated Tetrahymena cilia are allowed to spontaneously disintegrate in the presence of ATP, the structural conformation of the dynein arms can be clearly resolved by negative contrast electron microscopy. The arms consist of three struct...

Polynuclear transition metal complexes, which frequently constitute the active sites of both biological and chemical catalysts, provide access to unique chemical transformations that are derived from metal-metal cooperation. Reductive elimination via ligand-bridged binuclear intermediates from bimetallic cores is one mechanism by which metals may cooperate during catalysis. We have established ...

The maturation of Madeira wines usually involves exposure to relatively high temperatures which affect the aroma and flavour composition leading to the formation of the typical and characteristic bouquet of these wines. The formation of heterocyclic acetals (1,3-dioxanes and 1,3-dioxolanes) was investigated in order to determine levels and for possible use as indicators of wine age. The results...