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Scheme of the multiple-microcosm setup to assess the effects of five different Ψw values on bacterial dispersal, growth, and biodegradation. The water potential in each column was adjusted with different concentrations of NaCl or PEG 8000. P. putida KT2440-gfp was inoculated into the center (×) of each well, and one column served as an abiotic control.
