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Published online 12 October 2005
Published in J Environ Qual 34:1952-1957 (2005)
DOI: 10.2134/jeq2005.0017
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Antibacterial Activity of Soil-Bound Antibiotics

Yogesh Chandera, Kuldip Kumara, Sagar M. Goyalb and Satish C. Guptaa,*

a Department of Soil, Water and Climate, 1991 Upper Buford Circle, University of Minnesota, Saint Paul, MN 55108
b Department of Veterinary Population Medicine, 1333 Gortner Avenue, University of Minnesota, Saint Paul, MN 55108



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  		Fig. 1. Percent decline in colony forming units (CFU) of antibiotic sensitive strain of Salmonella sp. (SalmonellaS) at various concentrations of soil-adsorbed tetracycline. Soil adsorbed antibiotic concentration was calculated using Eq. [1]. Lines represent the best-fit values.

 


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  		Fig. 2. Percent decline in colony forming units (CFU) of three microbial strains with two different antibiotics. Values are means over two soils, five different antibiotic concentrations, and two different growth conditions. Bars with same letter are not significantly different at p = 0.05. SalmonellaR, antibiotic resistant strain of Salmonella sp.; SalmonellaS, antibiotic sensitive strain of Salmonella sp.

 


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  		Fig. 3. Percent decline in colony forming units (CFU) for two growth conditions with two different antibiotics. Values are means over two soils, five different antibiotic concentrations, and three bacterial species. Bars with same letter are not significantly different at p = 0.10.

 




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