Environmental change and copper uptake by Bacillus subtilis subsp. niger and by Pseudomonas fluorescens |
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Authors: | M. G. C. Baldry A. C. R. Dean |
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Affiliation: | (1) Physical Chemistry Laboratory, University of Oxford, South Parks Road, 0X1 3QZ Oxford, Great Britain |
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Abstract: | The passive uptake of copper by B. subtillis subsp. niger ATCC 9372 and by a strain of Ps. fluorescens, isolated from polluted soil, has been determined. Prior to exposure to the metal ions the strains were grown to steady state in a wide variety of nutrient-limited chemostats operated at a dilution rate equal to one-half of their respective maximum growth rates. Carbon-limited organisms had the lowest uptakes and the uptakes increased as the limiting nutrient was changed in the order carbon < magnesium < nitrogen (NH4+) < potassium, with sulphur (SO42-) - and phosphate (glycerol 2-phosphate)-limited organisms occupying different positions with the two strains. |
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