Planktonic-cell yield of a pseudomonad biofilm
Date
2005
Authors
Bester E.
Wolfaardt G.
Joubert L.
Garny K.
Saftic S.
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Abstract
Biofilm cells differ phenotypically from their free-floating counterparts. Differential growth rates in biofilms are often referred to, particularly in response to limited diffusion of oxygen and nutrients. We observed growth rates of attached Pseudomonas sp. strain CT07 cells that were notably higher than the maximum specific growth rate measured in batch culture. Despite dilution rates in continuous flow cells that exceeded the maximum planktonic specific growth rate by 58 times, sampling of the effluent revealed > 109 cells ml-1, suggesting that biofilms function as a source of planktonic cells through high cell yield and detachment. Further investigation demonstrated considerable planktonic cell yield from biofilms as young as 6 h, indicating that detachment is not limited to established biofilms. These biofilm-detached cells were more sensitive to a commercial biocide than associated biofilm- and chemostat-cultivated populations, implying that detached biofilm cells exhibit a character that is distinct from that of attached and planktonic cell populations. Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Description
Keywords
Biocides, Cells, Diffusion in gases, Effluents, Microbiology, Oxygen, Biofilm cells, Dilution rates, Planktonic-cells, Pseudomonad biofilms, Biofilms, oxygen, ribosome DNA, biofilm, growth rate, plankton, article, bacterial growth, bacterium culture, biofilm, growth rate, nonhuman, nucleotide sequence, nutrient, plankton, Pseudomonas, strain difference, Animals, Biofilms, Kinetics, Plankton, Pseudomonas, Bacteria (microorganisms), Pseudomonas, Pseudomonas sp.
Citation
Applied and Environmental Microbiology
71
12
71
12