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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.