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Chromium(VI) resistance and removal by acinetobacter haemolyticus

Pei, Quek Hsiao and Shahir, Shafinaz and Santhana Raj, A. S. and Zakaria, Zainul Akmar and Ahmad, Wan Azlina (2009) Chromium(VI) resistance and removal by acinetobacter haemolyticus. World Journal of Microbiology and Biotechnology, 25 (6). pp. 1085-1093. ISSN 0959-3993

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Official URL: http://dx.doi.org/10.1007/s11274-009-9989-2


The present work highlighted the studies on Cr(VI) reduction by cells of Acinetobacter haemolyticus (A. haemolyticus). The strain tolerated 90 mg Cr(VI) l(-1) in LB broth compared to only 30 mg Cr(VI) l(-1) in LB agar. From the FTIR analysis, the Cr(III) species formed was also most likely to form complexes with carboxyl, hydroxyl, and amide groups from the bacteria. A TEM study showed the absence of precipitates on the cell wall region of the bacteria. Instead, microprecipitates were observed in the cytoplasmic region of the cells, suggesting the transportation of Cr(VI) into the cells. Intracellular reduction of Cr(VI) was supported by a reductase test using soluble crude cell-free extracts. The specific reductase activity obtained was 0.52 A mu g Cr(VI) reduced per mg of protein an hour at pH 7.2 and 37A degrees C. Our results indicated that A. haemolyticus can be used as a promising microorganism for Cr(VI) reduction from industrial wastewaters.

Item Type:Article
Uncontrolled Keywords:acinetobacter, chromium, mechanism, resistance
Subjects:Q Science > QD Chemistry
ID Code:13258
Deposited By: Ms Zalinda Shuratman
Deposited On:27 Jul 2011 09:50
Last Modified:27 Jul 2011 09:50

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