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...

We describe comparative studies, using double-radiolabelling techniques, on the uptake and retention of cobalt species in a simple marine food chain which includes phytoplankton (Dunaliella tertiolecta and Chaetoceros pseudocurviseturn), mixed copepods (mainly Centropages sp.), and fish (the sea perch Serranus scnba). Retention of cobalt from the diet was also studied for the latter 2 organisms...

Cobalt-containing lignin-based fibers were synthesized in one step by electrospinning of Alcell lignin solutions as carbon precursor, a low-cost and renewable co-product the paper making industry. The thermostabilized air to avoid fusion during carbonization process between 500-800 ºC obtain cobalt-containing porous submicron fibers. These catalysts studied for Low-Temperature Fischer-Tropsch s...

Cobalt-60 Irradiation/Testis/House Sparrow (Passer domesticus, Linn.) Adult male house sparrows were exposed to Co-60 external irradiation at doses of 475, 712 and 950R. The dose rate was 100 R/hr at a distance of one foot. The birds were autopsied at intervals of 1, 3, 5, 7 and 15 days after irradiation. Testes were studied for histopathological damage produced. There was a significant loss of...

A set of robust molecular cobalt catalysts for the generation of hydrogen from water is reported. The cobalt complex supported by the parent pentadentate polypyridyl ligand PY5Me(2) features high stability and activity and 100% Faradaic efficiency for the electrocatalytic production of hydrogen from neutral water, with a turnover number reaching 5.5 × 10(4) mol of H(2) per mole of catalyst with...

Glutamate-induced cobalt uptake reveals that non-NMDA glutamate receptors (GluRs) are present in rat taste bud cells. Previous studies involving glutamate induced cobalt staining suggest this uptake mainly occurs via kainate type GluRs. It is not known which of the 4 types of taste bud cells express subunits of kainate GluR. Circumvallate and foliate papillae of Sprague-Dawley rats (45~60 days ...

A novel cation exchange fiber supported solid membrane was developed for transport of cobalt, manganese and nickel metal ions. Fiber supported solid membrane was prepared by chemically modifying the cellulose fibers with citric acid. In the fiber supported solid membrane, the diffusion by capillary action by keeping the liquid phase in the porous solid fiber and ion exchange mechanism were used...