Investigating the antiproliferative activities of new Cu complexes with pyridine hydrazone derivatives of nalidixic acid.

To further explore the structural features and potential antibacterial and antitumor activities of polynuclear Cu coordination compounds with nalidixic acid (nx) derivatives, new complexes bearing nx hydrazones with N-pyridinyl moieties substituted at positions 2 and 3 (h2py and h3py) were synthesized. Complexes [Cu(CHNO)(CHNO)(HO)]4BF∙HO (1), and [Cu(CHNO)(CHNO)(HO)]4BF∙3HO (%) (2) were synthesized using h2py and h3py with Cu(BF)∙nHO as precursor, whereas the [Cu(CHNO)Cl]∙0.5HO complex (3) was synthesized with h2py and CuCl∙2HO.

,','' ,', imine-containing coordination motifs: ligand-directed synthesis of mononuclear and binuclear Cu compounds.

It is demonstrated here that tridentate imine ligands can control the nuclearity of copper(II) complexes based on the donor atoms present in the ligand. The ,',''-donating imine ligand led to a mononuclear compound, namely di-chlorido-[,-dimethyl-'-(pyridin-2-yl-methyl-idene)ethane-1,2-di-amine]copper(II) monohydrate, [CuCl(CHN)]·HO, , while the ,',-donating imine ligand produced a binuclear metal complex, namely μ-chlorido-di-chlorido-(μ-2-{[2-(di-methyl-amino)-ethyl]imino-methyl}phenolato)(,-dimethyl-ethylene-di-amine)-dicopper(II) 0.11-hydrate, [Cu(CHNO)Cl(CHN)]·0.

Seasonal variation in the populations of Polyphagotarsonemus latus and Tetranychus bastosi in physic nut (Jatropha curcas) plantations.

Studies on the seasonal variation of agricultural pest species are important for the establishment of integrated pest control programs. The seasonality of pest attacks on crops is affected by biotic and abiotic factors, for example, climate and natural enemies. Besides that, characteristics of the host plant, crop management, location and the pests' bioecology also affect this seasonality.