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Example sentences for: cu
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If the concentration of total organochlorine pesticides exceeds 0.15 µg/g wet weight, or the concentration of total organochlorine pesticides plus PCBs exceeds 0.30 µg/g wet weight, or toxic metals (Al, As, Cr, Cd, Cu, Pb, Ni, Zn, expressed as total metal) exceed 20 µg/g wet weight, the food should not be used (for analytical methods, see AOAC, 1990; and USDA, 1989).
Conditional gene-expression systems have previously been used to identify positive regulators of lifespan, such as Cu/ZnSOD and dGMII [ 7, 31].
A change in the frequency of Cu/Zn-superoxide dismutase (Cu/ZnSOD) alleles was observed, with the more active allele enriched in the long-lived O strains [ 29].
Cu tong
Pyridine-2,6-bis(thiocarboxylic acid) (pdtc) is an iron-regulated metabolite produced by certain pseudomonads that is highly reactive towards metals by virtue of a pair of thiocarboxylate groups and ring nitrogen that combine to form a non-specific, high affinity, tri-dentate ligand (Figure 1) [ 1 2 ] . The formation constants for Co, Cu, and Fe complexes of pdtc were determined to be greater than 10 33 [ 3 ] . Uptake studies using 59Fe showed that addition of pdtc to the growth medium of two different pdtc-producing pseudomonads increased the efficiency of iron uptake by 20% [ 1 ] . The contribution of pdtc to iron uptake may be due to the fact that the copper complex of pdtc (Cu:pdtc) has the ability to reduce both soluble and mineral forms of ferric iron) [ 1 ] . Not surprisingly, in light of its high affinity for essential metals, pdtc also exhibits antimicrobial activity [ 4 ] .
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