Article Abstract:
Soil bacterial communities show an increase in metal tolerance after 2 days followed by a stabilization when zinc (Zn) concentrations in the soil are increased. Tolerance remains unaffected by concentrations less than 2mmol of Zn kg (dry weight) of soil(sup -1). With Zn concentrations of 16mmol, tolerance begins after 4 months and lasts for more than one year. The addition of Cd, Cu and Ni also result in metal tolerance, which increases with prolonged soil incubation. At the end of a 28-month period, the bacterial communities show lower pH optimum and higher tolerance to lower osmotic potential.
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Article Abstract:
A study was conducted to determine the impact of metal-rich sludge amendments on various microbial community-based measurements such as phospholipid fatty acid (PLFA), the Biolog system, and the thymidine incorporation technique. Evidence suggests that community tolerance to specific metals such as copper, zinc, and nickel increased when the same metal was added to the soil. Furthermore, there were indications of cotolerance to metals whose concentration had not been heightened by the sludge treatment.
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Article Abstract:
The production of 14CO2 from (14C)dimethylsilanediol in soil indicates that the dimethylsilanediol present in soils is biodegradable. A fungus, Fusarium oxysporum Schlechtendahl, and a bacterium, an Arthrobacter species, which are capable of cometabolizing dimethylsilanediol are isolated. The addition of the dimethylsilanediol analogs, 2-propanol or dimethylsulfone, in soil enhances the rates of degradation.
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