magnetic nanoparticles of cobalt-zinc ferrite (co0.5zn0.5fe2o4) have been synthesized in a homogeneous aqueous solution at room temperature by co-precipitation method without any template and subsequent heat treatment. synthesis of material is confirmed using xrd from the report of single phase polycrystalline ferrite material and also determined lattice constant. atomic absorption spectrophoto...

The contamination of agricultural soils by heavy metals is a global problem. Soil texture as a biotic factor represents one of the most important factors that influences the distribution of organic matter and ultimately play decisive role in retention of heavy metals in soil ecosystem. The effects of heavy metals on soil microbial processes were investigated. Analytical grade sulphate and chlor...

Carbonic anhydrase (CA) is inactive unless associated with zinc, with possible substitution by cobalt. In this work, the complexation of zinc by CA was determined in sea-water using cathodic stripping voltammetry (CSV) with ligand competition. The zinc was found to be released from the CA over a period of 3 h when equilibrated with a competing complexing ligand and the complex was re-formed wit...

Bovine and human B erythrocyte carbonic anhydrases substituted with Co2+ cause an enhancement of the nuclear magnetic relaxation rate of solvent water protons (T1-l) at high pH that is decreased by the addition of carbonic anhydrase inhibitors such as azide and Ethoxzolamide. The part of T1-1 which can be inhibited by Ethoxzolamide is due to exchangeable protons located at the active site of th...

A. C. Tuan,1 J. D. Bryan,2 A. B. Pakhomov,3 V. Shutthanandan,4 S. Thevuthasan,4 D. E. McCready,4 D. Gaspar,4 M. H. Engelhard,4 J. W. Rogers, Jr.,4 K. Krishnan,3 D. R. Gamelin,2 and S. A. Chambers5,* 1Department of Chemical Engineering, University of Washington, Seattle, Washington, USA 2Department of Chemistry, University of Washington, Seattle, Washington, USA 3Department of Materials Science ...

background: to investigate the effect of zinc sulphate for prophylaxis of radiation-induced oral mucositis in patients with head and neck cancer. materials and methods: in the department of radiation oncology, ankara numune education and research hospital, 40 patients with head and neck cancer were selected randomly to receive either zinco-c 25 mg, four tablets daily or control group who did no...

The present study aims to explore how selenium supplementation affects the element distribution in the liver tissue of rats subjected to strenuous swimming exercise. Thirty-two Spraque-Dawley male rats were equally divided into the four groups: Group 1, normal control group. Group 2, selenium-supplemented, non-swimming (0.6 mg/kg/day sodium selenite) group. Group 3, swimming, no supplementation...

The prototype of the gamma-class of carbonic anhydrase has been characterized from the methanogenic archaeon Methanosarcina thermophila. Previously reported kinetic studies of the gamma-class carbonic anhydrase are consistent with this enzyme having a reaction mechanism similar to that of the mammalian alpha-class carbonic anhydrase. However, the overall folds of these two enzymes are dissimila...

We review two strategies for growing ZnO nanowires from zinc salts in aqueous and organic solvents. Wire arrays with diameters in the nanoscale regime can be grown in an aqueous solution of zinc nitrate and hexamethylenetetramine. With the addition of poly(ethylenimine), the lengths of the wires have been increased to 25 mum with aspect ratios over 125. Additionally, these arrays were made vert...

The chaperone activity of the heat shock protein Hsp33 is regulated by reversible disulfide bond formation. Oxidized Hsp33 is active, and reduced Hsp33 is inactive. We show that zinc binding is essential for the function of this redox switch. Our results reveal that Hps33 contains a new, high affinity (K(a) > 10(17) m(-)(1)), zinc-binding motif in the form Cys-X-Cys-X(27-32)-Cys-X-X-Cys. All fo...