The reactivity of groups in proteins may be studied in terms of their rates of reaction to form stable or unstable products or in terms of equilibria with small molecules or ions (2). The equilibria between cupric ions and peptides are of particular interest because of the stability and spectral properties of the complexes formed and the biological importance of the copper proteins. It has been...

For three years, about 1,500 hives were surveyed for varroa mites following feeding tests using cupric gluconate and cupric lactate in sucrose syrup. Three to five litres per hive of 0 to 2.8g of copper metal per litre of sucrose syrup were given in spring and/or summer. Bee and mite mortalities were recorded up to four years without significant toxicity being noted for honeybees. By contrast, ...

Incorporation of copper species into silica matrix was performed by the sol-gel method. Copper ions and copper particles were doped using two different copper sources; Cu(NO3)2.3H2O and copper particles chemically synthesized.The particles of copper metallic, cuprous and cupric oxide were prepared and the synthesis and characterizations of copper species were compared together. On the other han...

Speciation of copper in a contaminated soil during electrokinetic remediation (EKR) assisted by H3PO4 was studied by in situ X-ray absorption near edge structural (XANES) spectroscopy. The least-square fit of the XANES spectrum showed that CuCO3 (68%) and CuCl2 (32%) were the major copper species in the contaminated soil. In the presence of H3PO4 (40%), most of CuCl2 and about 24% of CuCO3 were...

Understanding the effect of temperature on the speciation of multivalent metals in solution is essential for many applications in industry. The results of the present Cu(II) and Zn(II) solutions speciation studies in tandem with thermodynamic calculations have shown that Cu or Zn ions proliferate in acidic solutions whilst in alkaline medium, solid Cu(OH)2 or Zn(OH)2 colloidal particles form. T...