Formation of Al3Zr or Al3(Zr1 x Tix) precipitates with a metastable L12 structure was investigated in conventionally solidified A1–0.1 Zr, Al–0.2 Zr, Al–0.1 Zr–0.1 Ti, and Al–0.2 Zr–0.2 Ti (at.%) alloys aged isothermally at 375, 400, or 425 C. Pronounced hardening results from nanometer-scale, spheroidal Al3Zr or Al3(Zr1 xTix) (L12) precipitates within solute-enriched dendrites. Interdendritic ...

tebrates by their abi}ity to bind tvvo Fe3' and two CO;-. The transfenin molecule, with a mo]ecu)ar mass of about 80 kDa, is folded into two similarly sized homologous Nand C-lobes that are stabilized by many intrachain disulfides. As observed by X-ray crystallography, each lobe is further diyided into two similarly sized domains, domain 1 and domain 2, and an Fe3+binding site is within the int...

The mining of valuable minerals from wastewater streams is attractive as it promotes a circular economy, beneficiation, and valorisation. To this end, the current study evaluated rapid removal aqueous Cr(VI) by polycationic/di-metallic Fe/Al (PDFe/Al) adsorbent recovered real acid mine drainage (AMD). Optimal conditions for were 50 mg/L initial Cr(VI), 3 g PDFe/Al, pH = 3, 180 min equilibration...

Dopamine is the most essential monoaminergic neurotransmitter involved in pathophysiology of neurodegenerative disorders, and its autoxidation has been recognized as one potential trigger factors for dopaminergic neuron loss. The cyclization dopamine o-quinone was shown to be irreversible rate-limiting step reaction at physiologic pH values. Furthermore, various metal ions such Al3+, Fe3+, Fe2+...

In this research, dipeptide (his-β-alanine) and porphyrin derivatives were choosen for comparing chelating ability of toxic metals such as Al3+, Cu2+, Hg2+ and Pb2+ in vitro. The reason for choosing these two compounds is that both of them are naturally present in biological systems and comparison of chelating ability of these two compounds has not yet been done. Synthesis and comparison of kin...

The activated sludge (AS) flocculability markedly improved after the addition of Al(3+) and Fe(3+) compared to Ca(2+) at a concentration of 2 mEq/L. Though the energy barrier decreased about 30% when Ca(2+) was added, the AS flocculability did not improve substantially. This indicates that extended DLVO theory can explain AS flocculation with Al(3+) and Fe(3+) as additives but is not appropriat...

The anticancer drug adriamycin binds iron and these complexes cycle to reduce molecular oxygen (Zweier, J. L. (1984) J. Biol. Chem. 259, 6056-6058). Optical absorption, EPR, and Mössbauer spectroscopic data are correlated with polarographic O2 consumption and chemical Fe2+ extraction measurements in order to characterize each step in this cycle. Fe3+ binds to adriamycin at physiologic pH formin...

The capacity of Al3+ to promote oxidative damage to brain membranes was investigated both in vitro and in vivo. In vitro, Al3+ and related metals (Sc3+, Ga3+, In3+, Be2+, Y3+, and La3+) stimulated Fe2+-initiated lipid and protein oxidation in brain myelin and synaptic membranes. Al3+, Sc3+, Y3+, and La3+ significantly promoted protein-associated carbonyl production in myelin, while in synaptic ...