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Cui, H. ; Wang, S.-P.* ; Jia, S.-G.* ; Zhang, N.* ; Zhou, Z.Q.*

Influence of ciprofloxacin on the microbial catabolic diversity in soil.

J. Environ. Sci. Health B 48, 869-877 (2013)

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Open Access Green as soon as Postprint is submitted to ZB.

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In this study, the effect of ciprofloxacin (CIP) on the catabolic diversity of soil microbial communities was evaluated. Soil samples were spiked with ciprofloxacin (0, 1, 5 and 50mgckg(-1)) and were incubated for 1, 3, 9, 22 and 40days. Untreated controls received only water. The functional diversity of the microbial community studied was characterized using a catabolic response profile (CRP). Six substrate groups were tested: carbohydrates, amino acids, carboxylic acids, aromatic chemicals, alcohols and polymers. After 40days, the CIP concentrations in the soil samples ranged from 25% to 58% of the initial concentrations. Soil respiratory responses to the individual substrates D-glucose, lactose, D-mannose, L-glutamic, Na-citrate, malic acid and inosine were inhibited at the high CIP concentrations (5 and 50mg center dot kg(-1)) in the soils and were increased at the lowest CIP concentration (1mg center dot kg(-1)). Soil respiration was inhibited at all of the CIP concentrations after the addition of D-galactose and glycerol. The CIP concentration and incubation time explained 45.3% of the variance of the catabolic responses. The CRP analysis clearly discriminated among the different CIP concentrations. The results suggest that CIP strongly affects the catabolic diversities of soil microbial communities and that its effect is more significant than that of incubation time.

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