Here we examined the role of cellular vitamin C in genotoxicity of carcinogenic chromium(VI) that requires reduction to induce DNA damage. In the presence of ascorbate (Asc), low 0.2-2 microM doses of Cr(VI) caused 10-15 times more chromosomal breakage in primary human bronchial epithelial cells or lung fibroblasts. DNA double-strand breaks (DSB) were preferentially generated in G2 phase as det...

The thermodynamic processes of phase separation are modeled, which significantly affect the temperature characteristics heat-resistant nickel alloys directional solidification. Using an empirical approach, new ratios elements Kg¢ and Kg have been obtained for first time, take into account combined effect alloying on multicomponent compositions cast alloys. calculated values critical temperature...

Poly(1,3-thiazol-2-yl methacrylamide-co-4-vinyl pyridine-co-divinylbenzene) was prepared and used as a sorbent for the solid-phase extraction of Cr(VI) ions from aqueous solution. Two forms of chromium showed different exchange capacities at different pH values; Cr(VI) was selectively retained especially at pH 2. The total chromium was determined after the oxidization of Cr(III) to Cr(VI) by po...

Cr(VI) is an important contaminant found at sites where chromium ore processing residue (COPR) is deposited. No low cost treatment exists for Cr(VI) leaching from such sites. This study investigated the mechanism of interaction of alkaline Cr(VI)-containing leachate with an Fe(II)-containing organic matter rich soil beneath the waste. The soil currently contains 0.8% Cr, shown to be present as ...

The weakly electric fish Eigenmannia is able to detect temporal disparities as small as 400 nsec between two signals from different parts of the body surface (Carr et al., 1986). The elements of this time-comparison circuit have been identified by EM reconstruction of its component cells. Information about the timing of the zero-crossing of signals on each area of the body surface is coded in p...

Present study dealt the removal of Cr(VI) in a tannery industry wastewater using rice husk silica powder as an adsorbent.The experimental investigations have been carried out by using rice husk silica powder for different adsorption dosage, different contact time and different pH against the initial Cr(VI) concentration of 292 mg/L. The maximum percentage removal of Cr(VI) in the tannery indust...

The High-Throughput Experimental Materials Database (HTEM-DB, htem.nrel.gov) is the endpoint repository for inorganic thin-film materials data collected during combinatorial experiments at National Renewable Energy Laboratory (NREL). This asset enabled by NREL’s Research Data Infrastructure (RDI) – a set of custom tools that collect, process, and store experimental metadata. Here, we describe d...

the potential of citrobacter freundii, a gram negative bacteria for the remediation of hexavalentchromium (cr(vi)) and trivalent chromium (cr(iii)) from aqueous solutions was investigated. bioremediationof cr(vi) involved both biosorption and bioreduction processes, as compared to only biosorption processobserved with respect to cr(iii) bioremediation. in the case of cr(vi) bioremediation studi...