copper

Accumulation of Heavy Metals and Arsenic by Medicinal Plant Raw Material of Bitter Hollow

The Voronezh region is traditionally the most important area of crop production and farming. The purpose of the study was to study the contamination by heavy metals of medicinal vegetable raw materials of the Voronezh region using the example of grass of the bitter emery collected in urban and agro-ecological systems, which experience various anthropogenic effects. The accumulations of heavy metals (lead, mercury, cadmium, nickel, copper, zinc, cobalt, chromium) and arsenic were studied, in 51 samples of pooch grass bitter.

Translocation of Copper, Zinc, Iron and Manganese in the Cultivated Oat (Avena sativa L., 1753)

Due to rising anthropogenic pressure, heavy metal pollution of the environment becomes the significant danger. This study is devoted to the investigation of Cu, Zn, Fe and Mn concentration in the oat and two types of soil, model polluted by metal sulfates. The method of atomic absorption spectroscopy was used. Cu concentration in mineral soil was much higher than Zn. When Cu and Zn were combined, also Fe and Mn, pairwise antagonism in mineral soil and in the oat was discovered. The oat accumulates Cu and Mn more actively than Zn and Fe.

The Influence of Aqueous Dispersions of Metal Nanoparticles on the Adhesive Properties of the Standard and Clinical Strains of Staphylococcus aureus

The initial stage of interaction of infectious agents with micro-organisms cells is the process of adhesion. So there is a need to develop methods that reduce the adhesive activity of microorganisms. Aim: to study the impact of water and water dialyzed dispersion of silver and copper nanoparticles obtained by biochemical synthesis, on the adhesive properties of the standard and clinical strains of S. aureus. Using standard techniques for cells of S.

Biosorption of Cu (II) by an Exopolysaccharide Isolated from Enterobacter Cloacae K7

An extracellular polysaccharide (EPS) produced by the gram- negative nonpathogenic rhizosphere bacteria Enterobacter cloa- cae K7 was isolated and characterized. The process of biosorption of Cu(II) cations from aqueous solution by the isolated exopoly- saccharides was investigated. The maximum sorption capac- ity was 0.17 mM/mg of EPS or 12 g of Cu(II) per g of EPS at pH 5, T = 25 °C, and incubation for 30 min.