Three dinuclear Co complexes [(Co2(H2L)2(OAc)2)] CH3OH (1), [CoCo(H2L)2(OAc)] 2CH3OH H2O (2), and [CoCo(H2L)2(CH3CN)(H2O)]Cl CH3CN 4H2O (3) [H4L is (3,5-di-tert-butyl-2-hydroxybenzylideneamino)-2(hydroxymethyl)propane-1,3-diol] were synthesized and characterized using single crystal X-ray diffraction and other analytical methods. Complex 1 having two Co centres was the only one found to show ca...

Strains of P. oryxae were cultured, and crude filtrates of culture medium were prepared as described by Neufeld et al. (2). Protein was measured by the method of Lowry et al. (3). Assays--The increase in absorbancy at 320 rnp due to the formation of diphenyl disulfide was used to measure thiooxidase activity with thiophenol as substrate. The reaction rate was linear and proportional to enzyme c...

Background: Mushroom Tyrosinase a potent candidate in clinical studies known as polyphenol oxidase, is a metaloenzyme from the oxidase superfamily widely distributed from lower to higher life forms. It plays a crucial role in sclerotization of exoskeleton in insects, also responsible for skin pigmentation in mammalians. Objective: In this study, after reconstitution of MT by some metal io...

A potentially dodecadentate N8O4-donor ligand obtained from 2,2'-biimidazole and l-valine and its tetranuclear Cu(ii) complexes in different degrees of protonation were characterized by chemical and spectroscopic methods. The extensive solution studies performed reveal that the rise in pH media leads successively to the formation of imidazolato (pKa(1) and pKa(2) and hydroxido (pKa(3) and pKa(4...