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Table 2 Viable cell counts for cultures grown with and without urea

From: The non-pathogenic Escherichia coli strain W secretes SslE via the virulence-associated type II secretion system beta

 Strain Ureaa 6 hrb 12 hrb 24 hrb 48 hrb
Wild-type 2.8 ± 0.1 × 109 6.9 ± 0.3 × 109 2.0 ± 0.3 × 109 1.2 ± 0.1 × 109
Δgsp 2.6 ± 0.3 × 109 6.2 ± 0.2 × 109 2.4 ± 0.2 × 109 1.2 ± 0.1 × 109
ΔsslE 2.7 ± 0.1 × 109 5.7 ± 0.2 × 109 2.3 ± 0.3 × 109 1.2 ± 0.1 × 109
Wild-type + 5.8 ± 0.3 × 106 3.2 ± 0.1 × 106 1.6 ± 0.1 × 106 3.1 ± 0.1 × 105
Δgsp + 7.9 ± 0.9 × 106 4.1 ± 0.2 × 106 2.2 ± 0.2 × 106 5.7 ± 0.3 × 105
ΔsslE + 6.3 ± 0.3 × 106 4.1 ± 0.3 × 106 2.1 ± 0.4 × 106 5.0 ± 0.6 × 105
  1. a –, no urea present; +, 1.15 M urea present.
  2. b Colony-forming units per ml of culture at the indicated time after inoculation, shown as means ± SEM for at least three replicate plate counts.