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. 1977 Nov;132(2):628–640. doi: 10.1128/jb.132.2.628-640.1977

Chemotaxis by Bdellovibrio bacteriovorus toward prey.

S C Straley, S F Conti
PMCID: PMC221905  PMID: 410796

Abstract

A chemotaxis assay system that uses a modified Boyden chamber was characterized and used for measurements of chemotaxis by Bdellovibrio bacteriovorus strain UKi2 toward several bacterial species. Bacteria tested included both susceptible and nonsusceptible cells (Escherichia coli, Pseudomonas fluorescens, Bacillus megaterium, and B. bacteriovorus strains UKi2 and D). None was attractive to bdellovibrios when present at densities below 10(7) cells per ml. Chemotaxis toward E. coli was studied most extensively; under conditions that minimized effects of osmotic shock to the cells, E. coli and exudates from E. coli at densities as high as 10(8) cells per ml failed to elicit a chemotactic response. Cell-free filtrates from mixed cultures of bdellovibrios and E. coli neither attracted nor repelled bdellovibrios. The data indicate that bdellovibrios do not use chemotaxis to locate prey cells.

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Selected References

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