Abstract Unreported graft copolymer of Meth Acrylamide (MAam) and our previously prepared fully characterized chitosan nanoparticles (CNPs) as a starting substrate has been synthesized under nitrogen atmosphere using potassium chromate /mandelic acid unique redox pair. This was done to see the impact both CNPs with respect well-dispersed nano sized particles, large surface areas, biodegradabili...

SiO2-supported silyl chromate catalyst is an important industrial catalyst for production of high grade HDPE pipe materials. The control of the short chain branch (SCB) distribution using this catalyst system is still a great challenge. In this work, ethylene and 1-hexene copolymers were synthesized using SiO2-supported silyl chromate catalyst combined with triisobutylaluminium (TIBA), triethyl...

The ChrT gene encodes a chromate reductase enzyme which catalyzes the reduction of Cr(VI). The chromate reductase is also known as flavin mononucleotide (FMN) reductase (FMN_red). The aim of the present study was to clone the full-length ChrT DNA from Serratia sp. CQMUS2 and analyze the deduced amino acid sequence and three-dimensional structure. The putative ChrT gene fragment of Serratia sp. ...

Permeable reactive barriers containing zerovalent iron are being increasingly employed for in situ remediation of groundwater contaminated with redox active metals and chlorinated organic compounds. This research investigated the effect of chromate concentration on its removal from solution by zerovalent iron. Removal rates of aqueous Cr(VI) by iron wires were measured in batch experiments for ...

BACKGROUND Hexavalent chromium [Cr(VI)] is a potent human carcinogen. Occupational exposure has been associated with increased risk of respiratory cancer. Multiple mechanisms have been shown to contribute to Cr(VI) induced carcinogenesis, including DNA damage, genomic instability, and epigenetic modulation, however, the molecular mechanism and downstream genes mediating chromium's carcinogenici...

The selection of appropriate surface pretreatments is one the pending issues for industrial application cerium-based chemical conversion coatings (CeCC) as an alternative toxic chromate coating (CrCC). A two-step pretreatment based on commercial products has been successfully used here to obtain CeCC AA2024-T3 and AA7075-T6. Specimens processed 1 15 min in solutions containing CeCl3 H2O2 have s...

Background: Chromium (Cr), a naturally occurring heavy metal, exists in many states, but the trivalent Cr (III) and hexavalent Cr (VI) forms are the most common in the environment. Acute and chronic toxicity in both animal and man are mainly caused by Cr (VI) compounds. Studies on hematological parameters in sub-acute toxicity of potassium chromate in broiler chicks are limited. Aims & Objectiv...

Chronopotent iometry of chromate in the presence of NiC12 in molten LiCIKCI eutectic reveals a diffusion controlled, three electron reduct ion step. In the presence of excess NiC12, chromate is reduced at --0.35V vs. P t ( I I ) / P t reference electrode and the electroactive species responsible for the chronopotentiometric wave is estimated to have a diffusion coefficient of 1.06 9 10 -5 cm 2 ...