Spectrophotometric studies are presented of the glycylglytine-copper(I1) [GG-Cu(II)] system in aqueous solution under conditions in which the ligand is present in great excess (up to 1000: 1). In highly basic solution (pH 12 to 13) the spectral absorption maximum changes with increasing ligand concentration from 640 to 540 rnp. The spectral data are interpreted in terms of an equilibrium betwee...

Ever since peptidases were shown to be present in serum, various theories have been proposed to explain the origin and the mode of release of these enzymes (14). A thorough study of the properties of various serum peptidases has, however, not been made; instead, most investigators have tacitly assumed that the serum enzymes behave in a manner analogous to that of the known peptidases isolated f...

A range of mostly new oxovanadium(IV) complexes is described. They contain coordinated Schiff bases, made from simple dipeptides (glycylglycine, glycylsarcosine, L-alanylglycine, L-alanyl-L-alanine, D,L-alanyl-D,L-alanine and L-serylglycine), and salicylaldehyde. The compounds are characterised and the nature of their coordination spheres shown by analysis, TLC, by appropriate spectroscopy (EPR...

The objective of this work is the further systematic improvement of the accuracy of Double-Hybrid Density Functionals (DHDF) that add non-local electron correlation effects to a standard hybrid functional by second-order perturbation theory (S. Grimme, J. Chem. Phys., 2006, 124, 034108). The only known shortcoming of these generally highly accurate functionals is an underestimation of the long-...