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- W1255530323 abstract "2 Abstract: Facultative anaerobic bacteria capable of reducing arsenate and selenate oxyanions were isolated from water and sediment samples collected from sites contaminated with industrial and agricultural wastes from Kafr el Dawar and Edko (Behera Governorate) and from kafr el Zayat (Gharbeya Governorate). Microbiological analysis and heavy metals determination of the collected samples was carried out. Three of the obtained isolates were identified by morphological and biochemical tests, these were Neisseria mucosa and Rahnella aquatilis (both are arsenate reducers) and Hafina alvei (a selenate reducer). The effect of some physical and chemical parameters on the growth and transformation efficiency of the three isolates was studied. Among the electron donors tested in the medium Na-lactate was preferred by Neisseria yielding the best growth, while Na-acetate and Na-formate were preferred by Hafnia and Rahnella, respectively. Selenate transformation by immobilized Hafnia cells was found to be positive and scanning electron microscope examination of the immobilized bacteria and precipitated selenium nanocrystals were observed. Differentiation and comparison of the three identified strains and six other bacterial isolates reducing selenate and arsenate was carried out by using restriction fraction length polymorphism (RFLP) technique and the similarity coefficient was determined for grouping the similar strains." @default.
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- W1255530323 date "2009-01-01" @default.
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- W1255530323 title "Arsenate and selenate reduction by some facultative bacteria in the Nile delta." @default.
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