کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4406656 | 1618698 | 2011 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Bioreduction of Cr(VI) by alkaliphilic Bacillus subtilis and interaction of the membrane groups
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
بوم شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Bioreduction of Cr(VI) by alkaliphilic Bacillus subtilis and interaction of the membrane groups Bioreduction of Cr(VI) by alkaliphilic Bacillus subtilis and interaction of the membrane groups](/preview/png/4406656.png)
چکیده انگلیسی
Detoxification of Cr(VI) under alkaline pH requires attention due to the alkaline nature of many effluents. An alkaliphilic gram-positive Bacillus subtilis isolated from tannery effluent contaminated soil was found to grow and reduce Cr(VI) up to 100% at an alkaline pH 9. Decrease in pH to acidic range with growth of the bacterium signified the role played by metabolites (organic acids) in chromium resistance and reduction mechanism. The XPS and FT-IR spectra confirmed the reduction of Cr(VI) by bacteria into +3 oxidation state. Chromate reductase assay indicated that the reduction was mediated by constitutive membrane bound enzymes. The kinetics of Cr(VI) reduction activity derived using the monod equation proved (Ks = 0.00032) high affinity of the organism to the metal. This study thus helped to localize the reduction activity at subcellular level in a chromium resistant alkaliphilic Bacillus sp.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Saudi Journal of Biological Sciences - Volume 18, Issue 2, April 2011, Pages 157-167
Journal: Saudi Journal of Biological Sciences - Volume 18, Issue 2, April 2011, Pages 157-167
نویسندگان
M.S. Mary Mangaiyarkarasi, S. Vincent, S. Janarthanan, T. Subba Rao, B.V.R. Tata,