A wide range of volcanic sublimates and alteration products from the Johnston-Lavis collection z has been analysed for major elements plus copper, lead, and zinc. 'Aphthitalite' and 'natrikalite' from Mount Vesuvius and an 'alum' from the island of Vulcano all proved to be enriched in copper and selected analyses are tabulated. The process leading to copper and lead enrichment of the Vesuvian m...

An uptake of zinc (Zn), copper (Cu), and lead (Pb) from aqueous solutions by ion exchange on natural zeolitic tuff has been studied. The Croatian zeolite clinoptilolite from the Donje Jesenje deposit has been used as a natural ion exchanger. The efficiency of removal is higher for Pb and Cu than for Zn ions. Measured concentrations of Si in the liquid phase identify the detachment of the alumin...

Despite evidence of contamination in Antarctic coastal marine environments, no water-quality guidelines have been established for the region because of a paucity of biological effects data for local Antarctic species. Currently, there is limited information on the sensitivity of Antarctic microalgae to metal contamination, which is exacerbated by the lack of standard toxicity testing protocols ...

Keywords---Iron, Copper, Cadmium, Chromium, Mercury, Nickel, Vanadium, Lead, Zinc, Free radicals, Oxidative stress, Redox cycling, Glutathione depletion, Lipid peroxidation, DNA damage, Stress proteins

Objectives. Superoxide dismutase, acting as a scavenger of oxygen free radicals, has shown mixed results in increasing survival from burn wounds. We previously demonstrated that human recombinant copper-zinc superoxide dismutase could increase the survival of failing ischaemic flaps in a rat model. Because of the similar pathophysiology of tissue ischaemia in flaps and intermediate zone burns, ...

The processes of melt formation were studied by methods optical and electron scanning microscopy. These occur during induction brazing a hard alloy to steel holder contact interaction low-melting (copper-zinc system alloy) refractory (iron-nickel) components the solders. It is shown that effect thermal magnetic-dynamic high-frequency electromagnetic field on composite solder how high-strength j...