Abstract For the in vitro examination of effects on cells and tissues metal ions derived from implants by wear corrosion, a system is needed to release controlled sustained manner. As small concentrations may have an impact biological systems, corresponding slow over defined period time necessary. Here, manufacturing method polymeric Poly(L-lactic acid) (PLLA) films with incorporated cobalt via...

Background: Cobalt (Co) is an essential trace element for mammals required for the synthesis of vitamin B12. It is not a cumulative toxin but chronic exposure induces negative effects on the organism. It was proven that cobalt passes via placenta appearing in the fetal blood and amniotic fluid and it is shown to possess an embryotoxic effect. Also, chromium (Cr) is recognized as a trace element...

The feasibility of using bis(delta2-2-imidazolinyl)-5,5'-dioxime (H2L) for the selective extraction of iron(III) from aqueous solutions was investigated by employing an solvent-extraction technique. The extraction of iron(III) from an aqueous nitrate solution in the presence of metal ions, such as cobalt(II), copper(II) and nickel(II), was carried out using H2L in binary and multicomponent mixt...

A promising strategy to break through the selectivity-conversion limit of direct methane conversion achieve high yields is protection methanol via esterification a more stable methyl ester. We present an aerobic methane-to-methyl-ester approach that utilizes highly dispersed, cobalt-containing solid catalyst, along with significantly favorable reaction conditions compared existing homogeneously...

BACKGROUND Cobalt has been shown to induce mainly asthma, allergic contact dermatitis and hard metal disease. The data on cobalt asthma are mainly based on case reports. AIMS To characterize all the cases of occupational cobalt asthma encountered in a cobalt plant at the time of diagnosis and 6 months later. We also evaluated the incidence of cobalt asthma in different departments on the basi...

in this work we report synthesis and magnetic characterization of cobalt doped zno nanoparticles (with different percent of doped cobalt oxide). synthesis of the materials was carried out at room temperature by polyacrylamide-gel method, using zink sulfate and cobalt nitrate as source materials, acrylamide as monomer and n,n-methylene bisacrylamide as a lattice reagent. characterization of the ...