نتایج جستجو برای: cobalt toxicity
تعداد نتایج: 147866 فیلتر نتایج به سال:
Cobalt pi-complexes, previously described in the literature and specially synthesized and characterized in this work, were used as catalysts in homogeneous oxidation of organic compounds with peroxides. These complexes contain pi-butadienyl and pi-cyclopentadienyl ligands: [(tetramethylcyclobutadiene)(benzene)cobalt] hexafluorophosphate, [(C₄Me₄)Co(C₆H₆)]PF₆ (1); diiodo(carbonyl)(pentamethylcyc...
Two field experiments were carried out to study groundnut physiological and chemical response to cobalt nutrition. Experiments were conducted at Research and production statation, National Research Centre, El-Nobaria Beheara Governorate, Delta, Egypt under drip irrigation system. Cobalt added once i.e. 0.0, 4, 6, 8, 10 and 12 ppm. The obtained results indicate that: Cobalt concentrations signif...
Nanotechnology is an emerging field that involves the development, manufacture and measurement of materials and systems in the submicron to nanometer range. Its development is expected to have a large socio-economical impact in practically all fields of industrial activity. However, there is still a lack of information about the potential risks of manufactured nanoparticles for the environment ...
Quinolinic acid (QA) is a potent endogenous excitotoxin; elevation of its concentration in an organism has been implicated in the pathogenesis of various disorders. The purpose of this study was the assessment of QA impact on the process of erythropoiesis. Marked increase of QA concentration was observed in plasma and peripheral tissues of uremic rats. These changes were proportional to the amo...
The iq-hmziitation of an experimental design to investigate the variation in cobalt hardened gold electrodeposition produced a series of electrodeposited AuCo alloys which had been stripped from their copper substrates. The magnetic properties of these electroplatings were measured at room temperature using the Faraday method. These measurements showed the presence of two magnetic phases. One p...
Mediation of reversible deactivation radical polymerization (RDRP) by cobalt(II) complexes (CMRP) is the most highly developed subcategory of organometallic mediated RDRP (OMRP). Attention was paid to CMRP for its unusual high efficiency observed for the control of acrylate and vinyl acetate polymerization that produced homo- and block copolymers with narrow molecular weight distribution and a ...
OBJECTIVES The inspiration of cobalt containing dust leads to various respiratory symptoms, including asthma and interstitial lung disease. Occupational asthma caused by cobalt chloride has been diagnosed in a 35-year-old patient, who worked as a diamond polishing disc former. The patient presented a 2-year history of dyspnea, cough and symptoms of rhinitis. MATERIALS AND METHODS The patient ...
Zn0.9Cd0.1S nanoparticles doped with 0.005-0.24 M cobalt have been prepared by co-precipitation technique in ice bath at 280 K. For the cobalt concentration >0.18 M, XRD pattern shows unidentified phases along with Zn0.9Cd0.1S sphalerite phase. For low cobalt concentration (≤0.05 M) particle size, dXRDis ~3.5 nm, while for high cobalt concentration (>0.05 M) particle size decreases abruptly (~2...
to cobalt with negative results for chromium, nickel and cement. Both prostheses were removed and the joints were sterile but contained grey pultaceous material with a relatively high cobalt and chromium content; there were multiple acetabular fractures on each side and the acetabular wall was paper-thin. Following the removal of the second prosthesis she became cobalt-negative and her urinary ...
As the number of commercial and consumer products containing engineered nanomaterials (ENMs) continually rises, the increased use and production of these ENMs presents an important toxicological concern. Although ENMs offer a number of advantages over traditional materials, their extremely small size and associated characteristics may also greatly enhance their toxic potentials. ENM exposure ca...
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