transition metal

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transition metal

[tran′zish·ən ‚med·əl]
(chemistry)
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The last year was difficult for mining exploration companies, but it was an improvement over 2013, says Scott McLean, president and CEO of Sudbury-based Transition Metals.
Additionally, Tsuji pioneered the discovery and development of many palladium-catalyzed reactions that are now routinely used in synthesis, and Trost masterfully developed and applied a variety of ring-forming and other reactions catalyzed by transition metals such as rhodium and molybdenum.
The monomers form donor-acceptor polymers with an electron acceptor, including transition metals, iron, cobalt, or nickel within a ferrocene, cobaltocene, or nickelocene monomer.
Therefore, the effects of transition metals and metal oxides are investigated extensively.
Their topics include the thermodynamics of surface phenomena, localized states and surface elementary excitations, calculating adhesion characteristics of metals and their melts by the density functional method, friction of surfaces of solids with no lubrication, and ferromagnetism in ultrathin films of transition metals.
Proteins also have excellent potential as antioxidant additives in foods because they can inhibit lipid oxidation through multiple pathways including inactivation of reactive oxygen species, scavenging free radicals, chelation of prooxidative transition metals, reduction of hydroperoxides, and alteration of the physical properties of food systems.
Results indicated that 24-hr transition metals and alkanes were associated with increased odds of hospital admissions for cardiovascular disease (CVD); transition metals were significantly associated with increased hospital admissions for ischemic heart disease, congestive heart failure, and atrial fibrillation; increased respiratory-related hospital admissions were significantly associated with exposure to alkanes; and aromatics and microcrystalline oxides were significantly associated with decreased CVD- and respiratory-related hospital admissions.
Toronto, Canada, Mar 4, 2011 - (ABN Newswire) - Transition Metals Corp (CVE:XTM) will be Exhibiting at the 2011 PDAC International Convention, Trade Show & Investors Exchange in Toronto.
Life could have originated multiples times, and, if we find life elsewhere in the universe, it could be very similar to the life we know here because it will be based on the same transition metals and ligands," Morowitz said.
Nine studies consider such topics as the reactivity of unstable chemicals in the presence of transition metals, the comparative statistics of Cooper's electron pairs in low-temperature superconductors and in coupled holes pairs in high-temperature ceramics, vitamin E as an example of applying rare earth triflates as efficient catalysts in the fine chemicals industry, and the fractal physical chemistry of polymer solutions.
The study carried out at the University of Warwick and the University of Leeds and published in the Journal of Medicinal Chemistry, showed that a range of compounds containing the two transition metals Ruthenium and Osmium, which are found in the same part of the periodic table as precious metals like platinum and gold, cause significant cell death in ovarian and colon cancer cells.
Transition metals may also promote the degradation of lipid hydroperoxides within cell membranes, or behave as non-enzymatic (pseudo-) peroxidases capable of converting innocuous catechol-containing compounds (such as the neurotransmitter, dopamine) to toxic ortho-semiquinone intermediates.