FIGURE 7.

Images of wild-type and host-independent mutant Bdellovibrio taken in contact mode (deflection). The morphology varied widely. (A) Cocultured with E. coli on filters over DNB plates, the wild-type Bdellovibrio consumed all of the prey. (B) These wild-type Bdellovibrio was grown in solution with E. coli, and then after clearing, the solution of prey were spotted onto a filter and imaged. (C and D) The host-independent mutant Bdellovibrio stuck together on filters, even when pelleted, rinsed, and deposited on plates with minimal nutrients. (E and F) These mutants had flagella and, when left to grow on nutrient media plates overnight, were very long.