Structures have been refined for twelve crystals of fourmarierite from various localities in the Democratic Republic of Congo, and one synthetic crystal. Single-crystal diffraction data were collected using MoKa X-radiation and a CCD-based detector mounted on a Bruker three-circle diffractometer. All crystals have orthorhombic symmetry, space group Bb21m. The natural crystals have similar unit-...

In the title compound, [MoPb(C₅H₅)(CH₃COO)(CO)₃], the Pb(II) atom is coordinated pyramidally via the Mo(0) atom of a {Cp(CO)₃Mo} (Cp = cyclo-penta-dien-yl) fragment [Pb-Mo = 3.0589 (5) Å] and a chelating acetate (Ac) group. Additionally, the [{Cp(CO)₃Mo}PbAc] units are linked along [100] by Pb-O(acetate) inter-actions, giving a ladder-type polymeric structure composed of PbCO₂ and Pb₂O₂ four-me...

Transition metal-transporting P1B-type CPx ATPases play crucial roles in mediating metal homeostasis and resistance in all cells. The degree to which N-terminal metal binding domains (MBDs) confer metal specificity to the transporter is unclear. We show that the two MBDs of the Zn/Cd/Pb effluxing pump Anabaena AztA are functionally nonequivalent, but only with respect to zinc resistance. Inacti...

The 2009/2010 pandemic influenza virus (H1N1pdm) contains an avian-lineage PB2 gene that lacks E627K and D701N substitutions important in the pathogenesis and transmission of avian-origin viruses in humans or other mammals. Previous studies have shown that PB2-627K is not necessary because of a compensatory Q591R substitution. The role that PB2-701N plays in the H1N1pdm phenotype is not well un...

T adsorption of heavy metals onto the surface of the algae is alternative technique for current wastewater treatment systems. Thus, this study was conducted to determine the ability of cyanobacteria for removal of pollutants from sewage water. Two soil microalgal isolates Anabaena oryzae and Cyanosarcina fontana were tested for growth, metabolism and removal of heavy metals (Fe2+, Pb2+, Cu2+ an...

The aberrant generation of oxygen and nitrogen free radicals can cause severe damage to key cellular components, resulting in cell apoptosis. Similarly, excitotoxicity leads to protease activation and mitochondrial dysfunction, which subsequently causes cell death. Each of these factors play critical roles in the neuronal cell death underlying various neurodegenerative diseases. Procyanidin B2 ...

The aim of this study is to investigate the use of keratin colloidal solution, which was obtained from wool, for the removal of Pb(II) from water. The addition of keratin colloidal solution (15 g L(-1), 0.30 mL) to a Pb(II) solution (1.0 mM, 0.90 mL, pH 5.0) resulted in the formation and precipitation of a Pb-keratin aggregate. Measurement of the Pb(II) and protein concentrations in the superna...

This study investigated simultaneous heavy metals removal and anthracene biodegradation by Rhodococcus opacus at different initial anthracene concentrations in the range 50-200 mg L-1. The heavy metals tested were Fe(III), Cu(II), Zn(II), Cd(II), Ni(II), and Pb(II) at 10 mg L-1 initial concentration: The organism was found to be well capable of removing the heavy metals along with high anthrace...

This thesis describes a series of studies undertaken to explore the criteria for the stabilization of Bi3+ in a perovskite through the formation of mixed A-site solid solutions. Electronically similar to Pb2+ but with a smaller ionic radius, Bi3+ has the potential to replace and improve upon Pb-based counterparts for dielectric and piezoelectric applications. Building off the discovery that Bi(...

Despite being one of the main sources iron, specularite is often associated with gangue minerals such as aegirine and chlorite. Flotation separation challenging in mineral processing industry because similar surface properties specularite, aegirine, This study investigates role selective activation mechanism Pb2+ flotation chlorite using micro-flotation experiments, solution chemistry calculati...