Cobalt-catalyzed activation of methylthio-substituted N-heterocycles facilitates either cross-coupling reactions with aryl- or benzylzinc compounds or synthesis of the corresponding zinc compounds.

Cobalt was recovered electrogeneratively by using a batch cell. In this system, a spontaneous chemical reaction occurred where cobalt is reduced at the cathode and zinc is oxidized to produce a free flow of electrical energy without any external power supply. The performances of reticulated vitreous carbon (RVC) and porous graphite (PG) as cathodes were evaluated based on the time and percentag...

Zinc, a component of a large number of enzymes and an abundant and essential trace metal, alters the structure of AGCT sites in negatively supercoiled DNA. Related sequences show little or no effect. Cobalt and cadmium show reactivities similar to zinc. The conformational change in DNA was fine mapped with haloacetaldehydes using chemical cleavage or primer extension methods. Since a many fold ...

Processes that enable marine phytoplankton to acquire trace metals are fundamental to our understanding of primary productivity and global carbon biogeochemical cycling. Here we show that the abundant marine cyanobacterium, Prochlorococcus strain MED4-Ax, has an absolute cobalt requirement and that zinc cannot substitute for cobalt in the growth medium, as is the case in some other phytoplankto...

in this study, the concentration of calcium (ca), cobalt (co), chromium (cr), copper (cu), iron (fe), potassium (k), magnesium (mg), manganese (mn), selenium (se) and zinc (zn) as essential metals, were determined in caviar of wild beluga sturgeon caught from the caspian sea in march 2012. potassium (4885.51± 17.81 µg g -1 ) and magnesium (346.61± 6.6 µg g -1 ) had the highest concentration and...

A system for separation of zinc traces from large amounts of cadmium is proposed in this paper. It is based on the solid-phase extraction of the zinc in the form of thiocyanate complexes by the polyurethane foam. The following parameters were studied: effect of pH and of the thiocyanate concentration on the zinc extraction, shaking time required for quantitative extraction, amount of PU foam ne...

(h) Controlled-release glass boluses (35 g) for use in sheep. The bolus contains by weight 13.4% copper. 0.5% cobalt and 0.3% selenium in a soluble glass matrix. (i) Sustained-release rumen bolus (80 g) for cattle. The bolus is composed of a compressed mixture of copper. cobalt. selenium. manganese. zinc. iodine and vitamins A. D and E. The round end of one bolus has been removed to show the 25...

Hypoxia-inducible factor 1 (HIF-1), the major transcription factor specifically activated during hypoxia, regulates genes involved in critical aspects of cancer biology, including angiogenesis, cell proliferation, glycolysis and invasion. The HIF-1a subunit is stabilized by low oxygen, genetic alteration and cobaltous ions, and its over-expression correlates with drug resistance and increased c...

Contact dermatitis is produced by external skin exposure to an allergen, but sometimes a systemically administered allergen may reach the skin and remain concentrated there with the aid of the circulatory system, leading to the production of systemic contact dermatitis (SCD). Metals such as nickel, cobalt, chromium, and zinc are ubiquitous in our environment. Metal allergy may result in allergi...

The magnetic moment and anisotropy of magnetite nanoparticles can be optimised by doping with transition metal cations, enabling their properties to be tuned for different biomedical applications. In this study, we assessed the suitability of bacterially synthesized zinc- and cobalt-doped magnetite nanoparticles for biomedical applications. To do this we measured cellular viability and activity...