Chromium accumulation by two Streptomyces spp. isolated from riverine sediments |
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| Authors: | M J Amoroso G R Castro A Durán O Peraud G Oliver R T Hill |
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| Institution: | (1) Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, Tucumán 4000, Argentina, AR;(2) Planta Piloto de Procesosos Microbiologicos Industriales, Tucumán 4000, Argentina, AR;(3) Estación Experimental Agroindustrial Obispo Colombres, Tucumán 4000, Argentina, AR;(4) Center of Marine Biotechnology, University of Maryland Biotechnology Institute, Baltimore, MD 21202, USA, US |
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| Abstract: | Strains designated R22 and R25, isolated from Salí River sediments, Argentina, were highly resistant to chromium. These strains
were shown by 16S rRNA sequencing studies to be Streptomyces spp.; this affiliation was consistent with morphological and chemical characteristics. Growth of strains R22 and R25 in medium
containing 100 mg l−1 chromate was reduced by only 23% and 34%, respectively, compared with growth in medium without added chromium. Streptomyces sp. strains R22 and R25 both accumulated chromium with yields of 10.0 and 5.6 mg Cr g−1 of dry weight, respectively, and a chromate concentration of 50 mg ml−1. Cell fractionation studies with strain R22 showed that the great majority of the chromium were associated with the cell
wall fraction. Streptomyces strains R22 and R25 may have applications in bioremediation of chromium contamination. Journal of Industrial Microbiology & Biotechnology (2001) 26, 210–215.
Received 23 June 2000/ Accepted in revised form 24 January 2000 |
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| Keywords: | : Streptomyces chromium accumulation metal resistance 16S rRNA |
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