A novel fluorescent chemodosimeter based on 1,8-naphthyridine exhibits high selectivity to Zn(2+) and Cu(2+). When 1-(7-acetamino-1,8-naphthyridyl)-2-(6-diacetaminopyridyl)ethene was mixed with CuCl2, hydrolysis of the acetamino group catalyzed by Cu(2+) complex was first observed. Resulting from coordination and hydrolysis catalyzed by the corresponding complex of Zn(2+) or Cu(2+), the highly ...

Fertilization of crops with pig manure is a common practice throughout the world. Nevertheless, due to the relatively high copper (Cu) and zinc (Zn) contents in pig manure, continuous application of pig manure could have negative effects on soil and plant. The study aimed at the impacts of long-term applying different pig manure rates (equivalently 0, 100, 250 and 500 kg total N/ha/year from 20...

Human Cu,Zn-superoxide dismutase (Cu,Zn-SOD) undergoes site-specific and random fragmentation by non-enzymic glycosylation (glycation). Released Cu2+ from the glycated Cu,Zn-SOD probably facilitates a Fenton reaction to convert H2O2 into hydroxy radical, which then participates in the non-specific fragmentation [Ookawara et al. (1992) J. Biol. Chem. 267, 18505-18510]. In the present study, we i...

Electromigration in the Ni/Sn-Zn/Cu solder interconnect was studied with an average current density of 3.51 9 10 A/cm for 168.5 h at 150 C. When the electrons flowed from the Ni side to the Cu side, uniform layers of Ni5Zn21 and Cu5Zn8 were formed at the Ni/Sn-Zn and Cu/Sn-Zn interfaces. However, upon reversing the current direction, where electron flow was from the Cu side to the Ni side, a th...

AIM To assess plasma Zn and Cu levels in individuals with depression. SUBJECTS AND METHODS Plasma from 73 clinically depressed individuals, 38 individuals with anxiety and 16 controls were tested for plasma Zn and Cu concentration using inductively-coupled plasma-mass spectrometry. RESULTS Depressed individuals, with and without secondary anxiety, had decreased plasma Zn and elevated plasma...

The aim of our study was to evaluate the mineral composition (Zn, Cu, Ca, Fe, Mg, P) of breast tumor tissue and hair, and to investigate the role of Zn and Cu contents in diet on tumor development, with DMBAinduced rat breast cancer being the experimental model. Female Sprague-Dawley rats were divided into study groups which, apart from the standard diet, were treated with Zinc ions (Zn) or Cop...

High Zn and Cu fecal concentrations impact the environment. Zn and Cu reductions in feed have compromised swine performance. Substituting amino acid chelated (AAC) sources for traditionally employed inorganic salts (IM) may overcome environmental and swine performance problems. A preliminary study demonstrated less 65Zn was deposited in rat feces due to greater AAC absorption compared to IM (P ...

Root-zone temperatures (RZT) in relation to Cu and Zn uptake and tissue accumulation, and to total biomass, in potato plants (Solanum tuberosum L. var. Spunta) were studied. Using five different plastic mulches (no cover, transparent polyethylene, white polyethylene, coextruded white-black polyethylene, and black polyethylene) resulted in significantly different RZT (16, 20, 23, 27, and 30 degr...

We have studied the adsorption state and the hydrogenation process of formate on clean and Zn-deposited Cu(111) surfaces by using DFT-GGA-pseudopotential calculations. After the deposition of Zn on the Cu(111) surface, the Zn atom is substitutionally adsorbed in the first layer of the Cu surface and Cu-Zn surface alloys are formed which is in agreement with experimental results. However, our ca...

zinc (zn) and copper (cu) are essential elements and increased plant growth in low concentrations. while high concentrations of these elements as a limiting factor, can cause adverse symptoms on the plants. in the present study, the uptake of micronutrient and macronutrient by pennyroyal were studied in a zn and cu deficiency and toxicity in soil. three levels of copper (0, 5 and 25 mg/kg) and ...