Aerobic Reduction of Chromium(VI) byPseudomonas corrugata28: Influence of Metabolism and Fate of Reduced Chromium

Removal and reduction of chromium by Pseudomonas spp. and their correlation to rhamnolipid production

“…The ability to reduce Cr(VI) and to resist high Cr(VI) concentrations were found to be independent properties of bacteria especially Pseudomonas sp. [25]. Using classical biochemical techniques, a novel soluble enzyme (ChrR) with chromate reductase activity was previously purified to homogeneity from Pseudomonas putida [26].…”

Molasses as an efficient low-cost carbon source for biological Cr(VI) removal

“…Biological methods, such as bioreduction, bio-accumulation or biosorption using microorganisms, have been examined for their chromium removal abilities [15][16][17] and these methods offer potential alternatives to existing technologies of Cr(VI) removal. Until now, most Cr(VI) removal by microbes was obtained using pure culture techniques under either anaerobic or aerobic conditions depending on the species [18][19][20][21][22][23]. Under anaerobic conditions, both abiotic and biotic reduction mechanisms are competitive (over time, pH may increase due to the mineralization of organic matter to CO 2 , which increases HCO 3 -concentration, or owing to an acid-consuming redox reaction).…”

Molecular mechanisms of Cr(VI) resistance in bacteria and fungi

“…Several recent reviews have summarized Cr(VI) resistance-tolerance mechanisms in microorganisms (Ramirez-Diaz et al, 2008;Poljsak et al, 2010). Studies have been performed on Cr(VI) efflux pumps (Nies et al, 2006;Branco et al, 2008), extracellular Cr(VI) reduction to Cr (III) (Priester et al, 2006;Gnanamani et al, 2010;Belchik et al, 2011;Chovanec et al, 2012), enzymes involved in the ROS detoxifying processes (Ackerley et al, 2004a, b;Cheng et al, 2009), repair of DNA lesions (Llagostera et al, 1986;Hu et al, 2005;Miranda et al, 2005;Decorosi et al, 2009), and sulfur metabolism Christl et al, 2012).…”