This article reports an experimental and theoretical investigation of mercury dissolution from dental amalgams immersed in neutral (noncorrosive) and acidic (corrosive) flows. Atomic absorption spectrophotometric measurements of Hg loss indicate that in neutral flow, surface oxide films formed in air prior to immersion persist and effectively suppress significant mercury release. In acidic (pH ...

Copper (Cu) is one of the essential trace metals which are necessary in maintaining the functioning of living organisms. The current knowledge on the role of copper in animal reproduction is presented in the article. Our studies have shown that complexes of copper (Cu²+) with gonadotropin-releasing hormone (GnRH) are even more effective in the release of LH than native GnRH. Moreover, Cu-GnRH i...

Copper tolerance among Arabidopsis ecotypes is inversely correlated with long-term K(+) leakage and positively correlated with short-term K(+) leakage (A. Murphy, L. Taiz [1997] New Phytol 136: 211-222). To probe the mechanism of the early phase of K(+) efflux, we tested various channel blockers on copper and peroxide-induced K(+) efflux from seedling roots. The K(+) channel blockers tetraethyl...

High temperature superconducting (HTS) magnets often work at high energy density and have slow quench propagation speed, so a will present serious risk to the safety of magnets. The protection method based on dump resistance can effectively reduce current release in HTS However, too large may cause excessive voltage across A system consisting resistances metal discs has been proposed. Copper ar...