The stability and structural properties of the metalloprotein superoxide dismutase 1 (SOD1) are found to depend critically on metal ions. Native SOD1 monomers coordinate one structural Zn(2+) and one redox-active Cu(2+/1+) to the active site. To do this, the Zn(2+) ions need to interact with the SOD1 protein on the denatured side of the folding barrier, prior to the formation of the folding nuc...

The effect of heavy metal ions (Cd, Cr 3+ , Cu 2 , Ni, Pb 2+ and Zn) on the growth and germination of conidia of the aphid pathogenic fungus Pandora neoaphidis was studied. The metal ions were added into the culture medium in three concentrations: A – concentration corresponding to the mean content of that metal in Polish soils, B – concentration 10-times higher and C – 100-times higher than th...

Fluorescence resonance energy transfer (FRET) has been used to study the global folding of an uranyl (UO(2)(2+))-specific 39E DNAzyme in the presence of Mg(2+), Zn(2+), Pb(2+), or UO(2)(2+). At pH 5.5 and physiological ionic strength (100 mM Na(+)), two of the three stems in this DNAzyme folded into a compact structure in the presence of Mg(2+) or Zn(2+). However, no folding occurred in the pre...

In this work, a novel method is described for the preconcentration of Pb2+, Cd2+ and Zn2+ ions in environmental samples using uniform silanized mesopor (LUS-1) functionalized by ethylenediamine groups as a new extractant. The determination of ions is done by inductively coupled plasma optical emission spectrometry (ICP-OES). The extraction time and efficiency, p...

The asymmetric unit of the title compound, tetra-aqua-tetrakis-{μ(3)-6,6'-di-oxido-2,2'-[1,2-phenyl-enebis(nitrilo-methyl-idyne)]diphenolato}octa-zinc(II) dimethyl sulfoxide tetra-solvate dihydrate, [Zn(8)(C(20)H(12)N(2)O(4))(4)(H(2)O)(4)]·4C(2)H(6)OS·2H(2)O, contains one quarter of a Zn(II) octa-nuclear complex with symmetry, one dimethyl sulfoxide mol-ecule and one half of a water mol-ecule w...

Optimization of Cd (II), Zn (II) and Cu (II) biosorption from contaminated water were performed as function of parameters (pH, contact time, initial metal ions concentration and yeast dose). The experimental results showed that the highest equilibrium adsorption capacity at the optimum pH were 8.5 for Cd (II) and 6 for Zn (II) and 6 for Cu (II). Optimum pH values were carried out to evaluate ot...

In the title coordination polymer, [Zn(C(14)H(11)NO(3))(C(2)H(6)OS)](n), each Zn(II) ion is five-coordinated in a slightly distorted trigonal-bipyramidal coordination environment, formed by three O atoms from two 2-[(2-oxido-1-naphth-yl)-methyl-eneamino]propanoate ligands, one O atom from a dimethyl sulfoxide mol-ecule and the N atom from the amino-propanoate ligand. The propanoate ligands brid...

Optimization of Cd (II), Zn (II) and Cu (II) biosorption from contaminated water were performed as function of parameters (pH, contact time, initial metal ions concentration and yeast dose). The experimental results showed that the highest equilibrium adsorption capacity at the optimum pH were 8.5 for Cd (II) and 6 for Zn (II) and 6 for Cu (II). Optimum pH values were carried out to evaluate ot...

A simple, sensitive and selective cloud point extraction procedure is described for the preconcentration and atomic absorption spectrometric determination of Zn and Cd ions in water and biological samples, after complexation with 3,3’,3”,3’”-tetraindolyl (terephthaloyl) dimethane (TTDM) in basic medium, using Triton X-114 as nonionic surfactant. Detection limits of 3.0 and 2.0 μg L and quantifi...

A novel BINOL-based ratiometric fluorescent sensor (R2) is presented, which can selectively respond to Zn(2+) over Cd(2+) and other metal ions with fluorescence enhancement in aqueous solution. The R2 was successfully applied in the imaging of Zn(2+) in living cells. Additionally, the in situ generated R2-Zn(II) ensemble could further serve as a probe to distinguish histidine from other amino a...