Sequential reduction of chromate and nitrate, two competitive electron acceptors, has been demonstrated for strains of Pseudomonas genus for both planktonic cells and cells immobilised in agar layers on the surface of synthetic membrane. Denitrification occurs practically after chromate depletion. This order of reduction process is consistent with redox potentials of the respective reactions. I...

A variety of chromate-free conversion coatings are being actively investigated to improve the corrosion performance light-weight alloys for aerospace and defense applications. Advancing coating, however, requires an in-depth understanding underlying mechanisms in order rationally design sustainable coatings. Here, we present a multiscale modeling approach predict metallic materials, with focus ...

A pseudomonad (CRB5) isolated from a decommissioned wood preservation site reduced toxic chromate [Cr(VI)] to an insoluble Cr(III) precipitate under aerobic and anaerobic conditions. CRB5 tolerated up to 520 mg of Cr(VI) liter(-1) and reduced chromate in the presence of copper and arsenate. Under anaerobic conditions it also reduced Co(III) and U(VI), partially internalizing each metal. Metal p...

The potential role of iron and copper and the involvement of hydroxyl radicals in the DNA cleavage caused by chromate and glutathione (GSH) has been investigated. We have also studied the ability of chromate, on reaction with ascorbate as well as in mixed solutions of ascorbate and GSH, to cause DNA strand breaks. In both fully demetalated and conventional (i.e., metal contaminated) systems, ch...

It is possible to partially transform the silver chromate precipitate present in Golgi stained structures into lead chromate. When this partial replacement is followed by a treatment in a solution containing thiosulphate ions, only lead chromate is left in the tissue. This results in a depleted impregnation of the originally Golgi stained structures without fading of their borderlines. The tiss...

SCOEL has already issued Summary Documents on both Lead and Lead Compounds (SCOEL/SUM 83) and Hexavalent Chromium Compounds (SCOEL/SUM 86), to which reference is made. On this basis, the present Summary Document on Lead Chromate is focussed on experimental data on the genotoxicity of lead chromate and on the issue of bioavailibility. Specific data on lead chromate published after the latest IAR...

SCOEL has already issued Summary Documents on both Lead and Lead Compounds (SCOEL/SUM 83) and Hexavalent Chromium Compounds (SCOEL/SUM 86), to which reference is made. On this basis, the present Summary Document on Lead Chromate is focussed on experimental data on the genotoxicity of lead chromate and on the issue of bioavailibility. Specific data on lead chromate published after the latest IAR...

Ochrobactrum tritici 5bvl1 is able to resist to high concentrations of chromate through the expression of an inducible chromate-resistant determinant, found in a mobile element (TnOtChr), which carries the genes, chrB, chrA, chrC and chrF. The regulation of chr operon present in TnOtChr, which is controlled by a transcriptional regulator, ChrB, was characterized in the current work. Fusions of ...

The objective of this study is to quantify and understand the effectiveness of a hexavalent chrome replacement ion to inhibit environmentally assisted fatigue crack propagation (EFCP) in high strength aluminum alloys. Because of dynamic-cyclic stress (or strain) loading, fatigue degradation occurs at stress levels considerably lower than the tensile or yield strength; degradation is exacerbated...